CN101277058B - Secondary time-delay soft start circuit of DC/DC convertor - Google Patents
Secondary time-delay soft start circuit of DC/DC convertor Download PDFInfo
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- CN101277058B CN101277058B CN2008100654448A CN200810065444A CN101277058B CN 101277058 B CN101277058 B CN 101277058B CN 2008100654448 A CN2008100654448 A CN 2008100654448A CN 200810065444 A CN200810065444 A CN 200810065444A CN 101277058 B CN101277058 B CN 101277058B
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Abstract
A DC/DC convertor secondary time-delay soft start circuit comprises a soft start capacitor which is in parallel connected between the in-phase input end of the error amplifier and the common earth. The soft start circuit is provided with a controllable switching element which is in parallel connected with a soft starting capacitor at the output end. The controllable input end of the controllable switching element is connected with the output end of the capacitance-resistance time delay circuit. The input end of the capacitance-resistance time delay circuit is connected with the input end of an auxiliary indication signal source which belongs to the original edge of DC/DC convertor. The time-delay soft start circuit according to the invention can effectively settle the contradiction between the in-time electric discharge and the ascending time of the output voltage when the input voltage descends. When the DC/DC convertor is opened, the indication signal from the original edge is used for controlling the discharging of the secondary soft start capacitor. The fast re-electrifying when the input voltage descends is settled. The soft start problem of DC/DC convertor is realized. And the primary soft start and secondary soft start can be better assorted with each other through regulating the action time of the secondary soft start by the capacitance-resistance time delay circuit.
Description
Technical field
The present invention relates to start-up circuit, especially relate to a kind of DC/DC converter secondary time-delay soft start circuit.
Background technology
The DC/DC converter that in communication power supply, adopts generally all is provided with soft starting circuit, vibrates to avoid starting the big and machine that opens of overshoot current.The soft start of isolated form DC/DC converter generally includes former limit soft start and secondary soft start.Because former limit soft start has overshoot when after the startup of DC/DC converter finishes, changing operate as normal over to and falls, at the also all corresponding soft starting circuit that is provided with of secondary.Traditional soft starting circuit generally all is at the reference edge soft electric capacity that opens that is connected in parallel, perhaps through the error amplifier output soft electric capacity that opens that is connected in parallel.But the soft electric capacity that opens is connected the problem that where all has shutdown back capacitor discharge.When in the standard of communication power supply, requiring input voltage to fall 1ms～10ms, the DC/DC converter closes the machine that can normally open of having no progeny.If the soft electric capacity that opens can not discharge during this period of time fully, output voltage overshoot in the time of will causing the DC/DC converter to restart, even can not normally open machine.Yet; The soft electric capacity that opens can discharge fully when satisfying input voltage and falling; The soft capacity that opens electric capacity just can not be big, if but the soft capacity that opens electric capacity is not too big, and the DC/DC converter output voltage rise time is just shorter; Can not satisfy user's instructions for use, softly when promptly input voltage falls open electric capacity discharge in time and there is contradiction in output voltage between the rise time.
Summary of the invention
Technical problem to be solved by this invention is to solve the contradiction that above-mentioned prior art exists, and proposes a kind of DC/DC converter secondary time-delay soft start circuit, with control soft delay time that opens of secondary and start-up time.
Technical problem of the present invention solves through following technical scheme.
This DC/DC converter secondary time-delay soft start circuit comprises the soft electric capacity that opens that is connected in parallel between error amplifier in-phase input end and the public ground.
The characteristics of this DC/DC converter secondary time-delay soft start circuit are:
Be provided with its output and the said soft gate-controlled switch device that electric capacity is connected in parallel that opens; The controlled input of said gate-controlled switch device is connected with the output of a rc-delay circuit, and the input of said rc-delay circuit is connected with the input in the index signal source that belongs to the former limit of DC/DC converter of an adapted.When the DC/DC converter is started shooting; Utilization comes from the index signal on the former limit of DC/DC converter; The soft capacitor discharge that opens of control DC/DC converter secondary solves and heavily powers on the soft problem that opens of realization DC/DC converter after input voltage falls fast; And regulate secondary soft operate time of opening through rc-delay circuit, soft the opening with soft the opening of secondary in former limit can be cooperatively interacted better.
Technical problem of the present invention solves through following further technical scheme.
Also be provided with the voltage-stabilizing device that reference voltage is provided for DC/DC converter secondary; One end of said voltage-stabilizing device be connected publicly; The other end is connected with DC/DC converter secondary reference voltage terminal through dropping resistor, also is connected with said soft output and the said error amplifier in-phase input end that opens an end of electric capacity, said gate-controlled switch device through filter resistance.
The said index signal source that belongs to the former limit of DC/DC converter comprises by the driving transformer on the former limit of DC/DC converter, the index signal source that can indicate the start of DC/DC converter that photoelectrical coupler transmits.
The time delay resistance two ends of the said rc-delay circuit diode of releasing that is connected in parallel can be released the voltage of delay capacitor fast through the diode of releasing.
Said gate-controlled switch device comprises N type channel mosfet, P type channel mosfet, NPN type switch triode, positive-negative-positive switch triode.
Preferably, said gate-controlled switch device is a NPN type switch triode.
The beneficial effect of the present invention and prior art contrast is:
Softly when time-delay soft start circuit of the present invention can effectively solve input voltage and falls open the contradiction that electric capacity discharge in time and output voltage existed between the rise time.When the DC/DC converter is started shooting; Utilization comes from the index signal on the former limit of DC/DC converter; The soft capacitor discharge that opens of control DC/DC converter secondary solves and heavily powers on the soft problem that opens of realization DC/DC converter after input voltage falls fast; And regulate secondary soft operate time of opening through rc-delay circuit, soft the opening with soft the opening of secondary in former limit can be cooperatively interacted better.
Description of drawings
Fig. 1 is the circuit diagram of the specific embodiment of the invention one;
Fig. 2 is the circuit diagram of the specific embodiment of the invention two;
Fig. 3 is the circuit diagram of the specific embodiment of the invention three.
Embodiment
Contrast accompanying drawing below and combine embodiment that the present invention is further described.
Embodiment one
DC/DC converter secondary time-delay soft start circuit as shown in Figure 1 comprises the soft capacitor C 1 that opens that is connected in parallel between error amplifier in-phase input end B and the public ground.Be provided with its output and soft and open the gate-controlled switch device Q1 that capacitor C 1 is connected in parallel; Gate-controlled switch device Q1 is a MOSFET; The output of the Γ type rc-delay circuit that its controlled input and is made up of time delay resistance R3 and delay capacitor C2 is connected, and the input of rc-delay circuit is connected with the input A in the index signal source that belongs to the former limit of DC/DC converter of an adapted.Time delay resistance R3 two ends are connected in parallel to the diode D1 that releases that the voltage that makes delay capacitor C2 can be released fast.Also be provided with the voltage-stabilizing device Z1 that 1.225V secondary reference voltage is provided for DC/DC converter secondary; Voltage-stabilizing device Z1 is a voltage stabilizing didoe; The one of which end be connected publicly; The other end is connected with DC/DC converter secondary reference voltage terminal VCC through dropping resistor R2, also through filter resistance R1 with softly open an end of capacitor C 1, output and the error amplifier in-phase input end B of gate-controlled switch device Q1 is connected.
When the DC/DC converter started, by a step index signal of driving transformer transmission on the former limit of DC/DC converter, the voltage of index signal end A was by the low height that changes to.Delay capacitor C2 charges through resistance R 3, gate-controlled switch device Q1 conducting, and remaining voltage is through gate-controlled switch device Q1 discharge on the capacitor C 1.When the voltage at R1 two ends dropped to the threshold voltage of gate-controlled switch device Q1 conducting, gate-controlled switch device Q1 turn-offed, and the soft capacitor C 1 that opens is through filter resistance R1 and dropping resistor R2 charging, DC/DC converter soft start.Through regulating resistance, the capacitance parameter of rc-delay circuit, the time constant that can regulate delay circuit is promptly regulated the preceding delay time of soft start; And through regulating resistance, the capacitance parameter that opens the rc charging circuit that capacitor C 1 forms by dropping resistor R2, filter resistance R1 and soft; Can regulate the time constant of charging circuit; Promptly regulate the time of soft start, thereby regulate the DC/DC converter rise of output voltage time.
When the DC/DC converter turn-offed, to low, released fast in 1ms through the diode D1 that releases by the voltage of delay capacitor C2 by hypermutation for the voltage of index signal end A.When restarting next time, the DC/DC converter is soft start normally.
Have no progeny because the DC/DC converter closes, the soft capacitor C 1 that opens can not be discharged immediately, when the DC/DC converter starts, needs control gate-controlled switch device Q1 conducting a period of time, and the soft voltage that opens capacitor C 1 is bled off.
Embodiment two
DC/DC converter secondary time-delay soft start circuit as shown in Figure 2; With the circuit difference of embodiment one be that gate-controlled switch device Q1 changes the NPN switch triode into by MOSFET, and between the output of the grid of NPN switch triode and rc-delay circuit, increase coupling resistance R4.Identical with the time-delay soft start function of embodiment one, soft start-up process is also basic identical.
Embodiment three
DC/DC converter secondary time-delay soft start circuit as shown in Figure 3 is to omit the diode D1 that releases that the resistance R 3 with rc-delay circuit is connected in parallel with the circuit difference of embodiment one.The effect of diode D1 is speed-up capacitor C2 discharge when the DC/DC converter turn-offs owing to release; Suitably select the parameter of capacitor C 2 and resistance R 3; The omission diode D1 that releases can not influence the time-delay soft start function of this circuit, and soft start-up process and embodiment one are also basic identical.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (4)
1. DC/DC converter secondary time-delay soft start circuit; Comprise the soft electric capacity that opens that is connected between error amplifier in-phase input end and the public ground; Said soft first end that opens electric capacity is connected with said error amplifier in-phase input end, and said soft second end that opens electric capacity is connected with said publicly; It is characterized in that:
Be provided with its output and the said soft gate-controlled switch device that electric capacity is connected in parallel that opens; First output of said gate-controlled switch device is connected with said soft first end that opens electric capacity; Second output of said gate-controlled switch device is connected with said soft second end that opens electric capacity; The controlled input of said gate-controlled switch device is connected with the output of a rc-delay circuit, and the input of said rc-delay circuit is connected with the input in the index signal source that belongs to the former limit of DC/DC converter of an adapted;
Wherein, Also be provided with the voltage-stabilizing device that reference voltage is provided for DC/DC converter secondary; One end of said voltage-stabilizing device be connected publicly; The other end is connected with DC/DC converter secondary reference voltage terminal through dropping resistor, and this other end also is connected with said soft first output and the said error amplifier in-phase input end that opens first end of electric capacity, said gate-controlled switch device through filter resistance;
The voltage of the input in the index signal source on the former limit of the said DC/DC of belonging to converter changes according to following mode: when said DC/DC converter started, the voltage of the input in said index signal source was by the low height that changes to; When said DC/DC converter turn-offed, the voltage of the input in said index signal source was by high step-down;
Said DC/DC converter starts, and the voltage of the input in said index signal source changes to when high said gate-controlled switch break-over of device by low.
2. DC/DC converter secondary time-delay soft start circuit as claimed in claim 1 is characterized in that:
The said index signal source that belongs to the former limit of DC/DC converter comprises by the driving transformer on the former limit of DC/DC converter and the index signal source that can indicate the start of DC/DC converter of photoelectrical coupler transmission.
3. DC/DC converter secondary time-delay soft start circuit as claimed in claim 2 is characterized in that:
The time delay resistance two ends of the said rc-delay circuit diode of releasing that is connected in parallel.
4. DC/DC converter secondary time-delay soft start circuit as claimed in claim 3 is characterized in that:
Said gate-controlled switch device comprises N type channel mosfet, P type channel mosfet, NPN type switch triode or positive-negative-positive switch triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100654448A CN101277058B (en) | 2008-02-28 | 2008-02-28 | Secondary time-delay soft start circuit of DC/DC convertor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100654448A CN101277058B (en) | 2008-02-28 | 2008-02-28 | Secondary time-delay soft start circuit of DC/DC convertor |
Publications (2)
| Publication Number | Publication Date |
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| CN101277058A CN101277058A (en) | 2008-10-01 |
| CN101277058B true CN101277058B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100654448A Expired - Fee Related CN101277058B (en) | 2008-02-28 | 2008-02-28 | Secondary time-delay soft start circuit of DC/DC convertor |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051166A (en) * | 2011-10-12 | 2013-04-17 | 上海华虹集成电路有限责任公司 | Soft start circuit for switching power supply |
| JP5794115B2 (en) * | 2011-11-07 | 2015-10-14 | ソニー株式会社 | POWER SUPPLY DEVICE, POWER CONTROL SYSTEM, AND ELECTRIC DEVICE STARTUP METHOD |
| CN103166443A (en) * | 2011-12-12 | 2013-06-19 | 海洋王照明科技股份有限公司 | Soft start control circuit and constant flow source drive circuit |
| CN102594111A (en) * | 2012-02-24 | 2012-07-18 | 中兴通讯股份有限公司 | Quick discharge circuit |
| CN102969883B (en) * | 2012-12-07 | 2016-05-04 | 深圳市核达中远通电源技术有限公司 | A kind of Switching Power Supply hiccup protections and delay protection circuit |
| CN104767373A (en) * | 2015-04-27 | 2015-07-08 | 海南汉地阳光石油化工有限公司 | Frequency converter low voltage self-starting control method and system |
| PL233866B1 (en) * | 2017-12-04 | 2019-12-31 | Siec Badawcza Lukasiewicz – Instytut Tele I Radiotechniczny | Soft start and cargo unloading system |
| CN112526329A (en) * | 2019-09-18 | 2021-03-19 | 上海度普新能源科技有限公司 | Relay adhesion diagnosis method and battery management system |
| CN113595047A (en) * | 2021-08-20 | 2021-11-02 | 南通大学 | Passive clamping circuit for online measurement of conduction voltage drop of power transistor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5917313A (en) * | 1997-12-19 | 1999-06-29 | Stmicroelectronics, Inc. | DC-to-DC converter with soft-start error amplifier and associated method |
| CN101084621A (en) * | 2004-12-21 | 2007-12-05 | 罗姆股份有限公司 | Switching regulator |
-
2008
- 2008-02-28 CN CN2008100654448A patent/CN101277058B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5917313A (en) * | 1997-12-19 | 1999-06-29 | Stmicroelectronics, Inc. | DC-to-DC converter with soft-start error amplifier and associated method |
| CN101084621A (en) * | 2004-12-21 | 2007-12-05 | 罗姆股份有限公司 | Switching regulator |
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| CN101277058A (en) | 2008-10-01 |
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Owner name: YADA POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140904 |
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Effective date of registration: 20140904 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Yada Power Products (Shenzhen) Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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