CN206756912U - Voltage detection circuit and circuit board - Google Patents
Voltage detection circuit and circuit board Download PDFInfo
- Publication number
- CN206756912U CN206756912U CN201621349849.0U CN201621349849U CN206756912U CN 206756912 U CN206756912 U CN 206756912U CN 201621349849 U CN201621349849 U CN 201621349849U CN 206756912 U CN206756912 U CN 206756912U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- triode
- discharge
- control chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title abstract 3
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
A voltage detection circuit comprises a voltage division circuit, a switch circuit, a charge-discharge delay circuit, a voltage stabilizing circuit and a voltage comparison circuit, wherein the input end of the voltage division circuit is electrically connected with a power supply, and the output end of the voltage division circuit is respectively electrically connected with the switch circuit and the voltage stabilizing circuit and is used for controlling the switch-on and switch-off of the switch circuit; the input end of the switch circuit is electrically connected with the power supply, and the output end of the switch circuit is electrically connected with the charge-discharge delay circuit; one input end of the voltage comparison circuit is electrically connected with the voltage stabilizing circuit, the other input end of the voltage comparison circuit is connected between the output end of the switch circuit and the charge-discharge delay circuit, and the output end of the voltage comparison circuit is electrically connected with a control chip. The voltage comparison circuit can control the enable or disable signal transmitted to the control chip, and the charge-discharge delay circuit can slow down the influence of the voltage change of the power supply on the control chip, so that the normal work of the control chip can be ensured. The utility model discloses still disclose a circuit board that contains this voltage detection circuit.
Description
Technical field
Voltage detecting technical field is the utility model is related to, more particularly to a kind of voltage detecting circuit and containing the voltage detecting
The circuit board of circuit.
Background technology
With the development of science and technology, television set or computer or other display equipment have turned into required in people's daily life
Product.For the ease of control, the circuit board containing control chip can be typically provided with television set or computer or other display equipment.
In the prior art, control chip is interfered in order to avoid the voltage change of power supply, typically can be in control chip
One functional module is set between power supply, and the output end of functional module also passes through a pull-up while being connected with control chip
Resistance is connected to power supply.
Although certain effect can be reached above by the anti-interference mode of pull-up resistor, when the voltage of power supply is fast
(fluctuated during speed fluctuation between such as 50%~100%), functional module also can be with the fluctuation of the voltage of power supply and in work and not work
Make quickly to change between state, so as to easily cause the operation irregularity of control chip.
Utility model content
Based on this, the purpose of this utility model is to provide a kind of voltage detecting circuit, has voltage detecting and delayed
Function, to ensure the normal work of control chip.
A kind of voltage detecting circuit, including bleeder circuit, on-off circuit, discharge and recharge delay circuit, mu balanced circuit and voltage
Comparison circuit, wherein,
The input of the bleeder circuit is electrically connected with the power supply, output end respectively with the on-off circuit and the voltage stabilizing
Circuit is electrically connected with, and for controlling the open and close of the on-off circuit；
The input of the on-off circuit is electrically connected with the power supply, and output end and the discharge and recharge delay circuit are electrical
Connection；
One input of the voltage comparator circuit is electrically connected with the mu balanced circuit, and another input is connected to
Between the output end of the on-off circuit and the discharge and recharge delay circuit, output end is electrically connected with a control chip；
When the voltage rising of the power supply, and the output voltage of the discharge and recharge delay circuit is higher than the mu balanced circuit
During output voltage, the output end of the voltage comparator circuit outputs enable signal to the control chip；
When the voltage decline of the power supply, and the output voltage of the discharge and recharge delay circuit is less than the mu balanced circuit
During output voltage, the output end of the voltage comparator circuit exports forbidden energy signal to the control chip.
Prior art is compared, in voltage detecting circuit described in the utility model, because the voltage comparator circuit can be
The enabled or forbidden energy signal transmitted to the control chip is controlled, the discharge and recharge delay circuit can slow down power supply
Influence of the voltage change to the control chip, it is possible to ensure the normal work of control chip.
Further, the on-off circuit includes multiple current-limiting resistances of series connection, the upper electricity being connected with the current-limiting resistance
Triode, wherein,
The emitter stage of the upper electric triode be connected in series successively with multiple current-limiting resistances and then with the power supply
Connection；
The base stage of the upper electric triode is connected by the bleeder circuit with the power supply；
The colelctor electrode of the upper electric triode is grounded by the discharge and recharge delay circuit.
Further, the discharge and recharge delay circuit includes a charge and discharge capacitance, and the charge and discharge capacitance is used to adjust institute
State the output voltage of discharge and recharge delay circuit.
Further, the voltage comparator circuit includes a comparator, and the comparator is voltage comparator or compares three
One kind among pole pipe.
Further, when the comparator is to compare triode, wherein,
The emitter stage of the relatively triode is connected with the colelctor electrode of the upper electric triode, for receiving the discharge and recharge
The voltage of delay circuit；
The base stage of the relatively triode is connected with the mu balanced circuit, for receiving the voltage of the mu balanced circuit；
The relatively colelctor electrode of triode is connected with the control chip, for by enabling after comparison or forbidden energy signal
Transmit to the control chip.
Further, the mu balanced circuit includes a voltage-regulator diode, the negative pole of the voltage-regulator diode and the comparison
The base stage connection of triode, the plus earth of the voltage-regulator diode.
Further, one end of the bleeder circuit is connected with the power supply, the base of other end triode compared with described
Pole connects.
Further, the bleeder circuit includes multiple divider resistances of series connection, the base stage connection of the upper electric triode
Between two divider resistances of arbitrary neighborhood.
Further, when the comparator is voltage comparator, wherein,
One end among the electrode input end or negative input of the voltage comparator is connected with the mu balanced circuit, is used
In the voltage for receiving the mu balanced circuit, the other end is connected with the discharge and recharge delay circuit, prolonged for receiving the discharge and recharge
When circuit voltage；
The output end of the voltage comparator is connected with the control chip, for by the enabled or forbidden energy signal after comparison
Transmit to the control chip.
A kind of circuit board, including substrate, the control chip on the substrate, and the voltage detecting circuit, it is described
Control chip is electrically connected with the voltage detecting circuit, for receiving enabled or forbidden energy letter caused by the voltage detecting circuit
Number.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of circuit board in the utility model first embodiment；
Fig. 2 is the structured flowchart of voltage detecting circuit in Fig. 1；
Fig. 3 is the circuit diagram of voltage detecting circuit in Fig. 2；
Fig. 4 is the circuit diagram of voltage detecting circuit in the utility model second embodiment.
Main element symbol description：
Following embodiment will further illustrate the utility model with reference to above-mentioned accompanying drawing.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Some embodiments of the present utility model are given in accompanying drawing.But the utility model can come in fact in many different forms
It is existing, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to public affairs of the present utility model
Open content more thorough and comprehensive.
It should be noted that when element is referred to as " being fixedly arranged on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement are for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " include
The arbitrary and all combination of one or more related Listed Items.
Referring to Fig. 1, a kind of circuit board provided in the utility model, including substrate 300, on the substrate 300
Control chip 200 and the voltage detecting circuit 100, the control chip 200 electrically connects with the voltage detecting circuit 100
Connect, for receiving enable signal caused by the voltage detecting circuit 100.
A kind of referring to Fig. 2, voltage detecting circuit 100, it is characterised in that：Including bleeder circuit 101, on-off circuit 102,
Discharge and recharge delay circuit 103, mu balanced circuit 104 and voltage comparator circuit 105, wherein,
The input of the bleeder circuit 101 is electrically connected with the power supply, output end respectively with the on-off circuit 102 and institute
Mu balanced circuit 104 is stated to be electrically connected with, and for controlling the open and close of the on-off circuit 102；
The input of the on-off circuit 102 is electrically connected with the power supply, output end and the discharge and recharge delay circuit
103 are electrically connected with；
One input of the voltage comparator circuit 105 is electrically connected with the mu balanced circuit 104, another input
It is connected between the output end of the on-off circuit 102 and the discharge and recharge delay circuit 103, output end and a control chip
200 are electrically connected with；
When the voltage rising of the power supply, and the output voltage of the discharge and recharge delay circuit 103 is higher than voltage stabilizing electricity
During the output voltage on road 104, the output end of the voltage comparator circuit 105 outputs enable signal to the control chip 200；
When the voltage decline of the power supply, and the output voltage of the discharge and recharge delay circuit 103 is less than voltage stabilizing electricity
During the output voltage on road 104, the output end of the voltage comparator circuit 105 exports forbidden energy signal to the control chip 200.
Fig. 2 and Fig. 3 are referred to, the on-off circuit 102 includes multiple current-limiting resistance R3 (10K) of series connection, with the limit
The upper electric triode Q2 (3CG3906M) of leakage resistance R3 connections, wherein,
The emitter stage of the upper electric triode Q2 be connected in series successively with multiple current-limiting resistance R3 and then with it is described
Power supply connects；
The base stage of the upper electric triode Q2 is connected by the bleeder circuit 101 with the power supply；
The colelctor electrode of the upper electric triode Q2 is grounded by the discharge and recharge delay circuit 103.
Specifically, in the present embodiment, the discharge and recharge delay circuit 103 includes a charge and discharge capacitance C1 (10uF), described
Charge and discharge capacitance C1 is used for the output voltage for adjusting the discharge and recharge delay circuit 103.The effect of the current-limiting resistance R3 is to work as
The discharge and recharge delay circuit 103 carries out current limliting when connecting, and avoids the excessive breakdown charge and discharge capacitance C1 of electric current.The present embodiment
In, the number of the current-limiting resistance R3 is one, it is possible to understand that, in other embodiments, the number of the current resistor R3
Can be multiple.
Specifically, in the present embodiment, when the voltage of the base stage of the upper electric triode Q2 is less than the upper electric triode Q2
Emitter stage voltage when, the upper electric triode Q2 conducting, the charge and discharge capacitance C1 is charged.
Fig. 2 and Fig. 3 are referred to, the voltage comparator circuit 105 includes a comparator, and the comparator is to compare triode
Q1, wherein,
The emitter stage of the relatively triode Q1 is connected with the colelctor electrode of the upper electric triode Q2, for receiving described fill
The voltage of discharge lag circuit 103；
The base stage of the relatively triode Q1 is connected with the mu balanced circuit 104, for receiving the mu balanced circuit 104
Voltage；
The colelctor electrode of the relatively triode Q1 is connected with the control chip 200, for by the enabled or taboo after comparison
Energy signal is transferred to the control chip 200.
Specifically, in the present embodiment, the comparator is compares triode Q1, for the voltage signal after comparison to be transmitted
To the control chip 200.Because voltage comparator also has the function being compared to the voltage of input, so, it is possible to understand that
, in other embodiments, the comparator can be voltage comparator or compare one kind among triode.
Fig. 2 and Fig. 3 are referred to, the mu balanced circuit 104 includes a voltage-regulator diode D1 (5.6V), the voltage-regulator diode
D1 negative pole triode Q1 compared with described base stage connection, the plus earth of the voltage-regulator diode D1.
Specifically, in the present embodiment, the effect of the voltage-regulator diode D1 is carried for the base stage of the relatively triode Q1
Voltage supplied reference value.
Fig. 2 and Fig. 3 are referred to, one end of the bleeder circuit 101 is connected with power supply, other end triode compared with described
Q1 base stage connection.
Specifically, in the present embodiment, the effect of the bleeder circuit 101 is between power supply and the mu balanced circuit 104
Voltage carry out partial pressure.The bleeder circuit 101 includes two divider resistance R1 (1K) and the R2 (4.7K) of series connection, the upper electricity
Triode Q2 base stage is connected between two divider resistance R1 and R2.
It should be understood that in other embodiments, the number of the divider resistance can be multiple.When the bleeder circuit
When the divider resistance in 101 is multiple, the base stage of the upper electric triode Q2, which is connected to described in two of arbitrary neighborhood, divides
Between piezoresistance.
It is total described, when the voltage of power supply raises so that the voltage of the emitter stage of the upper electric triode Q2 is higher than described
During the voltage of upper electric triode Q2 base stage, the upper electric triode Q2 conductings are charged to the charge and discharge capacitance C1, described
When charge and discharge capacitance C1 voltage is higher than the voltage of the voltage-regulator diode D1, relatively triode the Q1 emitter stage and base stage
Conducting, the relatively triode Q1 output enable signals；When the voltage of power supply declines so that the transmitting of the upper electric triode Q2
During the voltage of base stage of the voltage of pole less than the upper electric triode Q2, the upper electric triode Q2 cut-offs, the discharge and recharge electricity
Hold C1 to be discharged by the upper electric triode Q2 and the bleeder circuit 101, it is low in the voltage of the charge and discharge capacitance C1
When the voltage of the voltage-regulator diode D1, the relatively triode Q1 emitter stage ends with base stage, the relatively triode
Q1 exports forbidden energy signal.
The charge and discharge capacitance C1 relatively slow down the relatively triode Q1 during charging and discharging
Output high level or export the transformation period of high-impedance state, that is, reduce the voltage change of power supply to the relatively triode
The influence of the voltage pulsation of Q1 outputs.
Prior art is compared, in voltage detecting circuit 100 described in the utility model, due to the voltage comparator circuit 105
It can be controlled in the enabled or forbidden energy signal to transmitting to the control chip 200, the energy of discharge and recharge delay circuit 103
Enough slow down influence of the voltage change of power supply to the control chip 200, it is possible to ensure the normal of the control chip 200
Work.
Referring to Fig. 4, be a kind of voltage detecting circuit 100a provided in the utility model second embodiment, the present embodiment
Described in voltage detecting circuit 100a and voltage detecting circuit 100 described in first embodiment it is more or less the same, difference is
In the present embodiment, it is voltage comparator U1 that the voltage comparator circuit 105a, which includes, wherein,
One end among the electrode input end or negative input of the voltage comparator U1 connects with the mu balanced circuit 104
Connect, for receiving the voltage of the mu balanced circuit 104, the other end is connected with the discharge and recharge delay circuit 103, for receiving
State the voltage of discharge and recharge delay circuit 103；
The output end of the voltage comparator U1 is connected with the control chip 200, for by enabled after comparison or prohibiting
Energy signal is transmitted to the control chip 200.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model patent scope.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
- A kind of 1. voltage detecting circuit, it is characterised in that：Including bleeder circuit, on-off circuit, discharge and recharge delay circuit, voltage stabilizing electricity Road and voltage comparator circuit, wherein,The input of the bleeder circuit is electrically connected with the power supply, output end respectively with the on-off circuit and the mu balanced circuit It is electrically connected with, and for controlling the open and close of the on-off circuit；The input of the on-off circuit is electrically connected with the power supply, and output end electrically connects with the discharge and recharge delay circuit Connect；One input of the voltage comparator circuit is electrically connected with the mu balanced circuit, and another input is connected to described Between the output end of on-off circuit and the discharge and recharge delay circuit, output end is electrically connected with a control chip；When the voltage rising of the power supply, and the output voltage of the discharge and recharge delay circuit is higher than the output of the mu balanced circuit During voltage, the output end of the voltage comparator circuit outputs enable signal to the control chip；When the voltage decline of the power supply, and the output voltage of the discharge and recharge delay circuit is less than the output of the mu balanced circuit During voltage, the output end of the voltage comparator circuit exports forbidden energy signal to the control chip.
- 2. voltage detecting circuit according to claim 1, it is characterised in that the on-off circuit includes multiple limits of series connection Leakage resistance, the upper electric triode being connected with the current-limiting resistance, wherein,The emitter stage of the upper electric triode is connected in series with multiple current-limiting resistances and then connected with the power supply successively Connect；The base stage of the upper electric triode is connected by the bleeder circuit with the power supply；The colelctor electrode of the upper electric triode is grounded by the discharge and recharge delay circuit.
- 3. voltage detecting circuit according to claim 1 or 2, it is characterised in that the discharge and recharge delay circuit includes one Charge and discharge capacitance, the charge and discharge capacitance are used for the output voltage for adjusting the discharge and recharge delay circuit.
- 4. voltage detecting circuit according to claim 2, it is characterised in that the voltage comparator circuit compares including one Device, the comparator are voltage comparator or compare one kind among triode.
- 5. voltage detecting circuit according to claim 4, it is characterised in that when the comparator is to compare triode, Wherein,The emitter stage of the relatively triode is connected with the colelctor electrode of the upper electric triode, for receiving the discharge and recharge delay The voltage of circuit；The base stage of the relatively triode is connected with the mu balanced circuit, for receiving the voltage of the mu balanced circuit；The colelctor electrode of the relatively triode is connected with the control chip, for the enabled or forbidden energy signal after comparison to be transmitted To the control chip.
- 6. voltage detecting circuit according to claim 5, it is characterised in that the mu balanced circuit includes the pole of a voltage stabilizing two Pipe, the base stage connection of negative pole triode compared with described of the voltage-regulator diode, the plus earth of the voltage-regulator diode.
- 7. voltage detecting circuit according to claim 5, it is characterised in that one end of the bleeder circuit and the power supply Connection, the base stage connection of other end triode compared with described.
- 8. voltage detecting circuit according to claim 2, it is characterised in that the bleeder circuit includes multiple points of series connection Piezoresistance, the base stage of the upper electric triode are connected between two divider resistances of arbitrary neighborhood.
- 9. voltage detecting circuit according to claim 4, it is characterised in that when the comparator is voltage comparator, Wherein,One end among the electrode input end or negative input of the voltage comparator is connected with the mu balanced circuit, for connecing The voltage of the mu balanced circuit is received, the other end is connected with the discharge and recharge delay circuit, for receiving the discharge and recharge delay electricity The voltage on road；The output end of the voltage comparator is connected with the control chip, for the enabled or forbidden energy signal after comparison to be transmitted To the control chip.
- 10. a kind of circuit board, including substrate, the control chip on the substrate, and claim 1 to 9 any one institute The voltage detecting circuit stated, the control chip is electrically connected with the voltage detecting circuit, for receiving the voltage detecting Enabled or forbidden energy signal caused by circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621349849.0U CN206756912U (en) | 2016-12-09 | 2016-12-09 | Voltage detection circuit and circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621349849.0U CN206756912U (en) | 2016-12-09 | 2016-12-09 | Voltage detection circuit and circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206756912U true CN206756912U (en) | 2017-12-15 |
Family
ID=60607748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621349849.0U Active CN206756912U (en) | 2016-12-09 | 2016-12-09 | Voltage detection circuit and circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206756912U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668420A (en) * | 2018-05-23 | 2018-10-16 | 青岛海信宽带多媒体技术有限公司 | A kind of control circuit and optical module of light emission instruction signal |
| CN112630505A (en) * | 2021-03-05 | 2021-04-09 | 南京北路智控科技股份有限公司 | Wide-voltage self-adaptive high-isolation voltage detection circuit and detection method thereof |
-
2016
- 2016-12-09 CN CN201621349849.0U patent/CN206756912U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668420A (en) * | 2018-05-23 | 2018-10-16 | 青岛海信宽带多媒体技术有限公司 | A kind of control circuit and optical module of light emission instruction signal |
| CN112630505A (en) * | 2021-03-05 | 2021-04-09 | 南京北路智控科技股份有限公司 | Wide-voltage self-adaptive high-isolation voltage detection circuit and detection method thereof |
| CN112630505B (en) * | 2021-03-05 | 2021-06-01 | 南京北路智控科技股份有限公司 | Wide-voltage self-adaptive high-isolation voltage detection circuit and detection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201813422U (en) | Charging chip and mobile terminal capable of automatically adjusting charging mode | |
| CN201781310U (en) | Battery charge control circuit | |
| CN206349920U (en) | Power supply device with multi-stage soft start function | |
| CN103605017A (en) | Detection method of vehicle switch quantity signal | |
| CN204929366U (en) | DALI interface circuit | |
| CN104502683A (en) | Switch quantity signal detection method and detection circuit | |
| CN103928958A (en) | Lithium battery charging or discharging management circuit and lithium battery management system | |
| CN205793566U (en) | A kind of single live wire switch | |
| CN105022468A (en) | USB adapter and USB line | |
| CN103929854A (en) | LED drive device and LED dimming controller thereof | |
| CN206074715U (en) | A kind of direct current power-fail detection circuit | |
| CN206756912U (en) | Voltage detection circuit and circuit board | |
| CN203134330U (en) | LED display screen backlight brightness adjusting circuit and LED television | |
| CN103956899B (en) | Constant-current controller and BUCK constant-current circuit | |
| CN106714392A (en) | Sectional switching lighting adjustment control drive circuit with LED open circuit protection | |
| CN101865947B (en) | AC input detection circuit and detection method of power supply of flat television | |
| CN203775494U (en) | An LED driving device and an LED dimming driving controller thereof | |
| CN104167790B (en) | The charge control system and its charge control method of charger, mobile terminal | |
| CN104836304A (en) | Charging chip of lithium ion battery | |
| CN103855781A (en) | Charger and electronic device | |
| CN105045751A (en) | Serial TTL/RS232 electrical level adaptive apparatus | |
| CN103376748A (en) | Electronic device | |
| CN208836436U (en) | Anti-static circuit for data line | |
| CN202995351U (en) | Buzzer and switch-assembly multiplexing system | |
| CN206533586U (en) | Block switch brightness adjustment control drive circuit with LED open-circuit-protections |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |