CN104360147A - Test equipment for three-end voltage regulator - Google Patents
Test equipment for three-end voltage regulator Download PDFInfo
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- CN104360147A CN104360147A CN201410679364.7A CN201410679364A CN104360147A CN 104360147 A CN104360147 A CN 104360147A CN 201410679364 A CN201410679364 A CN 201410679364A CN 104360147 A CN104360147 A CN 104360147A
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Abstract
The invention discloses test equipment for a three-end voltage regulator. The test equipment for the three-end voltage regulator comprises a voltmeter L1 used for displaying voltage test values and a power supply P1 used for supplying electricity to the voltage regulator to be tested. The positive electrode of the power supply P1 is used for being connected with the input end of the voltage regulator to be tested, the negative electrode of the power supply P1 is used for being connected with the output end of the voltage regulator to be tested and the positive electrode of the voltmeter L1 through a regulating potentiometer RP1, the regulating end of the regulating potentiometer RP1 is used for being connected with the regulating end and the output end of the voltage regulator to be tested, and the negative electrode of the voltmeter L1 is connected with the negative electrode of the power supply P1. The test equipment for the three-end voltage regulator can regulate the amplitude value of output voltage through the regulating potentiometer, can realize test of current by switching different load circuits, can test whether the output voltage of the voltage regulator is normal, and can also test whether output current of the voltage regulator meets self index requirements. The test equipment is simple to operate, testes the voltage regulator rapidly and efficiently, enables results to be judged visually, and can be used for testing LM117 voltage regulators of three specifications.
Description
Technical field
The invention belongs to Electronic Testing Technology field, relate to a kind of three-terminal voltage regulator testing apparatus.
Background technology
LM117 type voltage regulator is a kind of three end adjustable output low voltage difference positive voltage regulators, can provide the output current of certain limit in 1.2V to 37V output voltage range, and specification, the packing forms of its output current value and LM117 voltage regulator are relevant.Comparatively conventional specification has LM117K, LM117T and LM117H etc.LM117K belongs to TO-3 encapsulation, and output-current rating is not less than 1.5A; LM117T belongs to TO-220 encapsulation, and output-current rating is not less than 1.5A; LM117H belongs to TO-39 encapsulation, and output-current rating is not less than 0.5A.LM117 voltage regulator voltage regulation and load regulation are all better than the fixed regulator of standard, and inside arranges overcurrent protection simultaneously, and chip overheating protection and the protection of Correctional tube trouble free service, voltage regulator is safe and reliable, convenient.The electric current and voltage test of traditional voltage regulator is comparatively loaded down with trivial details, and detection efficiency is low, needs to build corresponding commissioning device and pick-up unit, also needs to carry out welding and line according to the difference of packing forms.
Summary of the invention
The object of this invention is to provide a kind of three end adjustable voltage regulator testing apparatuss, to solve traditional method of testing test LM117 voltage regulator complex operation, the problem that detection efficiency is low.
In order to realize above object, the technical solution adopted in the present invention is: a kind of three-terminal voltage regulator testing apparatus, comprise voltage table L1 for showing voltage tester value and for the power supply P1 of voltage regulator supplies power to be measured, the positive pole of P1 is used for being connected with the input end of voltage regulator to be measured, the negative pole of P1 is used for being connected with the positive pole of L1 with the output terminal of voltage regulator to be measured by an adjustment pot RP1, the adjustable side of RP1 is used for being connected with output terminal with the adjustment end of voltage regulator to be measured, and the negative pole of L1 is connected with the negative pole of P1.
This device also comprises the current measurement circuit that is parallel to voltage table L1 two ends, the load commutation circuit that this current measurement circuit comprises the reometer L2 for showing testing current value and is made up of one group of resistor coupled in parallel.
This device also comprises a testing current indicating circuit, and this testing current indicating circuit comprises one group of pilot lamp branch road in parallel arranged with the resistance one_to_one corresponding of load commutation circuit.
This device also comprises the power supply P2 for Gong being electrically connected with voltage table L1 and reometer L2.
Described load commutation circuit and testing current indicating circuit are by a double-break switch synchro control.
The positive pole of described voltage table L1, between negative pole and adjustment pot RP1, be serially connected with resistance R2, R1 respectively.
Described power supply P1 two ends are parallel with one group of capacitance group.
The two ends of described voltage table L1 are parallel with one group of capacitance group.
The two ends of described voltage table L1 are parallel with one and store stream diode V4.
The amplitude of three end adjustable voltage regulator testing apparatuss of the present invention by regulating pot can adjust output voltage, utilize the numerical value of voltage table display translation voltage, the test of electric current is realized by switching different load circuits, utilize the numerical value of reometer display translation electric current, whether the output voltage that not only can test out voltage adjuster is normal, and whether the output current that can also test out voltage adjuster meets Self-index requirement.Testing apparatus simple to operate, detects fast, efficient, and result judges directly perceived, and can the test of LM117 voltage adjuster of compatible three kinds of specifications.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the present invention three end adjustable voltage regulator testing apparatus.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Be illustrated in figure 1 the structure principle chart of three-terminal voltage regulator testing apparatus embodiment of the present invention, as seen from the figure, this equipment comprises voltage table L1 for showing voltage tester value and for the power supply P1 of voltage regulator supplies power to be measured, the positive pole of P1 is connected with the input end of voltage regulator to be measured by gauge tap K1, the negative pole of P1 is used for being connected with the positive pole of L1 with the output terminal of voltage regulator to be measured by an adjustment pot RP1 (470 Ω), the adjustable side (2 pin) of RP1 is connected with output terminal with the adjustment end of voltage regulator to be measured, the negative pole of L1 is connected with the negative pole of P1.
The voltage regulator to be measured that the present embodiment provides is the LM117 voltage adjuster of three different sizes, and wherein, J1 is the socket of TO-220 encapsulation; J2 is the socket of TO-3 encapsulation; J3 is the socket of TO-39 encapsulation.When testing, LM117 voltage adjuster to be measured inserts in corresponding socket by the difference according to packing forms.If voltage adjuster to be tested is LM117K, be then inserted in J1 socket; If test voltage adjuster is LM117T, be then inserted in J2 socket; If test voltage adjuster is LM117H, be then inserted in J3 socket.
In addition, for realizing the test of electric current, this device also comprises the current measurement circuit that is parallel to voltage table L1 two ends, the load commutation circuit that this current measurement circuit comprises the reometer L2 for showing testing current value and is made up of one group of resistor coupled in parallel.The load commutation circuit of the present embodiment is made up of three resistance R3 (10 Ω), R4 (15 Ω), R5 (30 Ω) parallel connection, can realize third gear load regulation.
Meanwhile, for coordinating the instruction of different gear load current, this device also comprises a testing current indicating circuit, and this testing current indicating circuit comprises one group of pilot lamp branch road in parallel arranged with the resistance one_to_one corresponding of load commutation circuit.The parallel branch that the testing current indicating circuit of the present embodiment is made up of light emitting diode V1, V2, V3 of three different colours is formed, each instruction branch road is also serially connected with corresponding resistance R6 (300 Ω), R7 (300 Ω), R8 (300 Ω).
Voltage table L1 and the reometer L2 of this device are powered by power supply P2, and the feed circuit of P2 are provided with gauge tap K3 to carry out cut-offfing control; And testing current indicating circuit is also powered by power supply P2.
For the synchronism of proof load switching and electric current indicating circuit, load commutation circuit and testing current indicating circuit are passed through a double-break switch K2 synchro control, the K2 of the present embodiment is DPTT double-pole triple throw switch, the stationary contact A of K2 is connected in testing current indicating circuit, and corresponding three moving contacts A1, A2, A3 connect three instruction branch roads respectively; The stationary contact B of K2 is connected in load commutation circuit, and corresponding three moving contacts B1, B2, B3 connect three handoff leg respectively.
In addition, series resistor R2 (100 Ω) between the positive pole and adjustment pot RP1 of voltage table L1, series resistor R1 (1K Ω) between the negative pole and adjustment pot RP1 of L1.The capacitance group be made up of C1 (100uf), C2 (100uf) parallel connection in parallel at power supply P1 two ends; The capacitance group be made up of C3 (150uf), C4 (0.15uf) parallel connection in parallel at the two ends of voltage table L1; Meanwhile, be also parallel with one at the two ends of voltage table L1 and store stream diode V4.
Power supply P1, P2 of the present embodiment are direct supply; L1, L2 are digital watch; K1, K2 all adopt single-pole double-throw switch (SPDT), when connecting by circuit extremely corresponding for one of them moving contact serial connection, by unsettled for another one moving contact.Certainly, K1, K2 two switches also can adopt single-pole single-throw switch (SPST).
Principle of work of the present invention and process as follows, K1, K3 are got to A2 contact, connect P1, P2, carry out voltage and current test respectively:
Voltage tester: regulate pot RP1, then the numerical value of L1 display should be able to be followed the adjustment of RP1 and change, and adjusts RP1 and make the display numerical value of L1 be 15V ± 1.5V.If the numerical value of L1 display can not change all the time during adjustment RP1, illustrate that voltage adjuster to be measured damages.
Testing current: if voltage adjuster model to be tested is LM117K or LM117T, first toggle switch K2 to the second moving contact is connected, then yellow indicator lamp V2 should light, the reading of L2 should be 1.0A ± 0.1A, if the reading of L2 is less than 1.0A ± 0.1A, then show that the output current index of LM117K or LM117T does not meet Self-index requirement; Connected to the 3rd moving contact by toggle switch K2, then red led V1 should light again, and the reading of L2 should be 1.5A ± 0.15A, if the reading of L2 is less than 1.5A ± 0.15A, then shows that the output current index of LM117K or LM117T does not meet Self-index requirement; If voltage adjuster model to be tested is LM117H, toggle switch K2 to the first moving contact is connected, then green indicating lamp V3 should light, and the reading of L2 should be 0.5A ± 0.05A, if the reading of L2 should be less than 0.5A ± 0.05A, then show that the output current index of LM117H does not meet Self-index requirement.
After being completed, K1, K2 are got to A1 contact with powered-down P1, P2.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (9)
1. a three-terminal voltage regulator testing apparatus, it is characterized in that: comprise voltage table L1 for showing voltage tester value and for the power supply P1 of voltage regulator supplies power to be measured, the positive pole of P1 is used for being connected with the input end of voltage regulator to be measured, the negative pole of P1 is used for being connected with the positive pole of L1 with the output terminal of voltage regulator to be measured by an adjustment pot RP1, the adjustable side of RP1 is used for being connected with output terminal with the adjustment end of voltage regulator to be measured, and the negative pole of L1 is connected with the negative pole of P1.
2. three-terminal voltage regulator testing apparatus according to claim 1, it is characterized in that: this device also comprises the current measurement circuit that is parallel to voltage table L1 two ends, the load commutation circuit that this current measurement circuit comprises the reometer L2 for showing testing current value and is made up of one group of resistor coupled in parallel.
3. three-terminal voltage regulator testing apparatus according to claim 2, it is characterized in that: this device also comprises a testing current indicating circuit, this testing current indicating circuit comprises one group of pilot lamp branch road in parallel arranged with the resistance one_to_one corresponding of load commutation circuit.
4. the three-terminal voltage regulator testing apparatus according to Claims 2 or 3, is characterized in that: this device also comprises the power supply P2 for Gong being electrically connected with voltage table L1 and reometer L2.
5. three-terminal voltage regulator testing apparatus according to claim 3, is characterized in that: described load commutation circuit and testing current indicating circuit are by a double-break switch synchro control.
6. three-terminal voltage regulator testing apparatus according to claim 1, is characterized in that: the positive pole of described voltage table L1, be serially connected with resistance R2, R1 respectively between negative pole and adjustment pot RP1.
7. three-terminal voltage regulator testing apparatus according to claim 1, is characterized in that: described power supply P1 two ends are parallel with one group of capacitance group.
8. three-terminal voltage regulator testing apparatus according to claim 1, is characterized in that: the two ends of described voltage table L1 are parallel with one group of capacitance group.
9. three-terminal voltage regulator testing apparatus according to claim 1, is characterized in that: the two ends of described voltage table L1 are parallel with one and store stream diode V4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410679364.7A CN104360147A (en) | 2014-11-24 | 2014-11-24 | Test equipment for three-end voltage regulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410679364.7A CN104360147A (en) | 2014-11-24 | 2014-11-24 | Test equipment for three-end voltage regulator |
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| CN104360147A true CN104360147A (en) | 2015-02-18 |
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| CN201410679364.7A Pending CN104360147A (en) | 2014-11-24 | 2014-11-24 | Test equipment for three-end voltage regulator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018081918A1 (en) * | 2016-11-01 | 2018-05-11 | 华为技术有限公司 | Switching power supply circuit and switching power supply current detection method |
| CN113310501A (en) * | 2021-04-27 | 2021-08-27 | 成都国营锦江机器厂 | Floor level meter tester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018081918A1 (en) * | 2016-11-01 | 2018-05-11 | 华为技术有限公司 | Switching power supply circuit and switching power supply current detection method |
| CN113310501A (en) * | 2021-04-27 | 2021-08-27 | 成都国营锦江机器厂 | Floor level meter tester |
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Application publication date: 20150218 |
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