CN203365654U - Power supply self-detect circuit - Google Patents

Power supply self-detect circuit Download PDF

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Publication number
CN203365654U
CN203365654U CN 201320340649 CN201320340649U CN203365654U CN 203365654 U CN203365654 U CN 203365654U CN 201320340649 CN201320340649 CN 201320340649 CN 201320340649 U CN201320340649 U CN 201320340649U CN 203365654 U CN203365654 U CN 203365654U
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China
Prior art keywords
resistance
resistor
output
integrated circuit
output voltage
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CN 201320340649
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Chinese (zh)
Inventor
陈朝滨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENGDU SIWI POWER ELECTRONIC TECHNOLOGY CO., LTD.
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CHENGDU SIWI AVIATIC POWER SUPPLY Co Ltd
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Priority to CN 201320340649 priority Critical patent/CN203365654U/en
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Abstract

The utility model discloses a power supply self-detect circuit. The power supply self-detect circuit comprises an output voltage positive electrode OUTPUT [plus], an output voltage negative electrode OUTPUT [minus], a first resistor R3, a second resistor R4, an input voltage VCC, a ground GND, a light emitting diode and a photo-transistor. The power supply self-test circuit further includes a third resistor R5, a fourth resistor R6, a divided voltage Va and an integrated circuit IC1. The photo-transistor is connected in series with the ground GND. The photo-transistor is connected in parallel with the second resistor R4. The second resistor R4 is connected in series with the input voltage VCC. The light emitting diode is connected in series with the first resistor R3. The first resistor R3 is connected in series with the output voltage positive electrode OUTPUT [plus]. The light emitting diode is connected in series with the integrated circuit IC1. The integrated circuit IC1 is connected in series with the output voltage negative electrode OUTPUT [minus]. The first resistor R3 is connected in parallel with the third resistor R5. The third resistor R5 is connected in series with the fourth resistor R6. The fourth resistor R6 is connected in parallel with the output voltage negative electrode OUTPUT [minus]. A wire is led between the third resistor R5 and the fourth resistor R6 and is connected in parallel with the integrated circuit IC1. The power supply self-detect circuit has the advantage of more accurate detection.

Description

A kind of power self test circuit
Technical field
The utility model relates to power supply and manufactures field, particularly a kind of power self test circuit.
Background technology
As shown in Figure 1, the principle of this circuit is when output voltage OUTPUT is arranged to existing power self test circuit, level led conducting before photoelectrical coupler U1, secondary phototriode conducting, a low level of TTL signal level output.Otherwise the TTL signal is output as high level.The shortcoming of sort circuit is as long as reach certain output voltage as OUTPUT1, even also do not export normal rated voltage to, optocoupler all likely can conducting, output TTL low level signal.If this road output voltage occurred and do not reached the fault of rated voltage, system can correctly not detect this fault, wrong report occurs, can not realize the function of correct self check.
The utility model content
The purpose of this utility model addresses the above problem, a kind of increase by one road branch pressure voltage Va is provided, by the 3rd resistance R 5 and R6, to the output voltage dividing potential drop, finally increases integrated circuit (IC) 1, by branch pressure voltage Va relatively, realize that output voltage detects power self test circuit more accurately.
Power self test circuit of the present utility model, comprise the anodal OUTPUT+ of output voltage, output voltage negative pole OUTPUT-, the first resistance R 3, the second resistance R 4, input voltage VCC, ground connection GND, light emitting diode and phototriode, also comprise the 3rd resistance R 5, the 4th resistance R 6, branch pressure voltage Va and integrated circuit (IC) 1, light emitting diode and phototriode form photoelectrical coupler U2, the phototriode collector is connected with ground connection GND, the phototriode emitter is in parallel with the second resistance R 4, the phototriode base stage is the sensitization part, the second resistance R 4 is connected with input voltage VCC, the positive pole of light emitting diode is connected with the first resistance R 3, and the first resistance R 3 is connected with the anodal OUTPUT+ of output voltage, the negative pole of light emitting diode is connected with the anode of integrated circuit (IC) 1, and integrated circuit (IC) 1 negative electrode is connected with output voltage negative pole OUTPUT-, the first resistance R 3 is in parallel with the 3rd resistance R 5, and the 3rd resistance R 5 is connected with the 4th resistance R 6, and the 4th resistance R 6 is in parallel with output voltage negative pole OUTPUT-, draws wire between the 3rd resistance R 5 and the 4th resistance R 6 in parallel with the reference level of integrated circuit (IC) 1.
Preferably, integrated circuit (IC) 1 is TL431.
In sum, power self test circuit provided by the utility model has increases by a road branch pressure voltage Va, by the 3rd resistance R 5 and R6, to the output voltage dividing potential drop, finally increases integrated circuit (IC) 1, by branch pressure voltage Va relatively, realize that output voltage detects advantage more accurately.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is existing power self test circuit;
The schematic diagram that Fig. 2 is a kind of power self test circuit.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
-as shown in Figure 2, power self test circuit of the present utility model, comprise the anodal OUTPUT+ of output voltage, output voltage negative pole OUTPUT-, the first resistance R 3, the second resistance R 4, input voltage VCC, ground connection GND, light emitting diode and phototriode, it is characterized in that: also comprise the 3rd resistance R 5, the 4th resistance R 6, branch pressure voltage Va and integrated circuit (IC) 1, light emitting diode and phototriode form photoelectrical coupler U2, the phototriode collector is connected with ground connection GND, the phototriode emitter is in parallel with the second resistance R 4, the phototriode base stage is the sensitization part, the second resistance R 4 is connected with input voltage VCC, the positive pole of light emitting diode is connected with the first resistance R 3, and the first resistance R 3 is connected with the anodal OUTPUT+ of output voltage, the negative pole of light emitting diode is connected with the anode of integrated circuit (IC) 1, and integrated circuit (IC) 1 negative electrode is connected with output voltage negative pole OUTPUT-, the first resistance R 3 is in parallel with the 3rd resistance R 5, the 3rd resistance R 5 is connected with the 4th resistance R 6, the 4th resistance R 6 is in parallel with output voltage negative pole OUTPUT-, draws wire between the 3rd resistance R 5 and the 4th resistance R 6 in parallel with the reference level of integrated circuit (IC) 1, and integrated circuit (IC) 1 is TL431.
The 3rd resistance R 5, the 4th resistance R 6 are the branch pressure voltage Va=OUTPUT after the output voltage dividing potential drop sending into the reference level of IC1TL431 makes comparisons.As branch pressure voltage Va<2.5V, IC1TL431 negative electrode and not conducting of anode, the loop no current first level led, that the negative electrode and positive electrode of IC1TL431 forms of the first resistance R 3, photoelectrical coupler U2 flows through, TTL signal output high level.When branch pressure voltage Va>2.5V, the IC1TL431 conducting, photoelectrical coupler is level led current flowing just, TTL signal output low level.Adjust the resistance of the 3rd resistance R 5, the 4th resistance R 6, make output voltage branch pressure voltage Va >=2.5V when rated voltage, thereby realized accurate detection output voltage, send the function of correct self check TTL signal.
Although by reference to the accompanying drawings embodiment of the present utility model is described in detail, should not be construed as the restriction to the protection domain of this patent.In the described scope of claims, the various modifications that those skilled in the art can make without creative work and distortion still belong to the protection domain of this patent.

Claims (2)

1. a power self test circuit, comprise output voltage anodal OUTPUT+, output voltage negative pole OUTPUT-, the first resistance R 3, the second resistance R 4, input voltage VCC, ground connection GND, light emitting diode and phototriode, it is characterized in that: also comprise the 3rd resistance R 5, the 4th resistance R 6, branch pressure voltage Va and integrated circuit (IC) 1; Light emitting diode and phototriode form photoelectrical coupler U2, and the phototriode collector is connected with ground connection GND, and the phototriode emitter is in parallel with the second resistance R 4, and the phototriode base stage is the sensitization part, and the second resistance R 4 is connected with input voltage VCC; The positive pole of light emitting diode is connected with the first resistance R 3, and the first resistance R 3 is connected with the anodal OUTPUT+ of output voltage; The negative pole of light emitting diode is connected with the anode of integrated circuit (IC) 1, and integrated circuit (IC) 1 negative electrode is connected with output voltage negative pole OUTPUT-; The first resistance R 3 is in parallel with the 3rd resistance R 5, and the 3rd resistance R 5 is connected with the 4th resistance R 6, and the 4th resistance R 6 is in parallel with output voltage negative pole OUTPUT-, draws wire between the 3rd resistance R 5 and the 4th resistance R 6 in parallel with the reference level of integrated circuit (IC) 1.
2. power self test circuit according to claim 1 is characterized in that: integrated circuit (IC) 1 is TL431.
CN 201320340649 2013-06-14 2013-06-14 Power supply self-detect circuit Active CN203365654U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320340649 CN203365654U (en) 2013-06-14 2013-06-14 Power supply self-detect circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320340649 CN203365654U (en) 2013-06-14 2013-06-14 Power supply self-detect circuit

Publications (1)

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CN203365654U true CN203365654U (en) 2013-12-25

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CN (1) CN203365654U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849641A (en) * 2017-03-20 2017-06-13 常州格力博有限公司 A kind of mu balanced circuit
CN108896931A (en) * 2018-05-22 2018-11-27 绵阳市维博电子有限责任公司 A kind of self-diagnosis system for track signal monitoring probe power working condition
CN109342973A (en) * 2018-11-19 2019-02-15 中车大连电力牵引研发中心有限公司 DC supply input status monitoring circuit and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849641A (en) * 2017-03-20 2017-06-13 常州格力博有限公司 A kind of mu balanced circuit
CN108896931A (en) * 2018-05-22 2018-11-27 绵阳市维博电子有限责任公司 A kind of self-diagnosis system for track signal monitoring probe power working condition
CN109342973A (en) * 2018-11-19 2019-02-15 中车大连电力牵引研发中心有限公司 DC supply input status monitoring circuit and system

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: CHENGDU SIWI POWER ELECTRONICS TECHNOLOGY CO., LTD

Free format text: FORMER NAME: CHENGDU SIWI AVIATION POWER SUPPLY CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: 3, No. 1, building 1, building 35, 610091 west slope Su Road, Chengdu, Sichuan

Patentee after: CHENGDU SIWI POWER ELECTRONIC TECHNOLOGY CO., LTD.

Address before: 3, No. 1, building 1, building 35, 610091 west slope Su Road, Chengdu, Sichuan

Patentee before: Chengdu SIWI Aviatic Power Supply Co., Ltd.