CN214278295U - Power supply state judging device - Google Patents
Power supply state judging device Download PDFInfo
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- CN214278295U CN214278295U CN202023297017.8U CN202023297017U CN214278295U CN 214278295 U CN214278295 U CN 214278295U CN 202023297017 U CN202023297017 U CN 202023297017U CN 214278295 U CN214278295 U CN 214278295U
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- resistor
- hysteresis comparator
- power supply
- current sources
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Abstract
The utility model belongs to the power field, in particular to a power supply state judgment device, which can simplify short circuit, reduce chip area and reduce cost, and comprises two current sources which are arranged in parallel, one end of the two current sources is connected with a first resistor R1 and a power supply, the other end of the first resistor R1 is connected with one end of a second resistor, the other end of the second resistor is connected with a positive phase input end of an upper hysteresis comparator and one end of a third resistor R3, the other end of the third resistor R3 is connected with an inverse phase input end of a lower hysteresis comparator and one end of a fourth resistor R4, the other ends of the two current sources are connected with one end of a fifth resistor R5 and an inverse phase input end of the upper hysteresis comparator, the other end of the fifth resistor R5 is connected with an emitter of a triode Q1 and one throwing point of a single-pole double-throw switch S1, the output end of the upper hysteresis comparator is connected with the output end of the lower comparator and the other throwing point of a single-pole double throw switch S1, the single-pole double-throw switch S1 is connected with the collector and the base of the triode Q1 and the other end of the fourth resistor R4 and is grounded.
Description
Technical Field
The utility model belongs to the power field specifically is a power supply state judges device.
Background
In the current electrified age, the social demand for energy is increasing day by day, as large as the equipment operation of factories and as small as the electronic equipment used by everyone. When some equipment is powered, the power supply needs to be ensured to be normal, and the power consumption needs to be reduced abnormally.
If the power-on is carried out, the slow start is needed, so that the impact on equipment is reduced; in the undervoltage stage, a subsequent circuit needs to be closed, so that misoperation and power loss are reduced, and the service life of equipment is ensured; in the high-voltage stage, a subsequent circuit needs to be quickly closed, so that the subsequent circuit is prevented from being damaged; after overcurrent occurs, the subsequent equipment is closed after the judgment of a fixed time, the service life of the subsequent equipment is ensured, the circuits are shown in figure 1, at present, the circuits can only realize the judgment of a single state, a power supply system is ensured to be stable, a multi-channel control circuit needs to be arranged, the structure is complex, more chip areas are occupied, and the cost is high.
SUMMERY OF THE UTILITY MODEL
In order to solve current circuit structure complicacy, occupy a large amount of chip area, problem with high costs, the utility model provides a power supply state judges device, and it can simplify the short circuit, reduces chip area, reduce cost.
The technical scheme is as follows: a power supply state judging device is characterized by comprising two current sources which are arranged in parallel, wherein one ends of the two current sources are connected with a first resistor R1 and a power supply, the other end of the first resistor R1 is connected with one end of a second resistor, the other end of the second resistor is connected with a positive phase input end of an upper hysteresis comparator and one end of a third resistor R3, the other end of the third resistor R3 is connected with an inverse phase input end of a lower hysteresis comparator and one end of a fourth resistor R4, the other ends of the two current sources are connected with one end of a fifth resistor R5 and an inverse phase input end of the upper hysteresis comparator, the other end of the fifth resistor R5 is connected with an emitter of a triode Q1 and one throw of a single-pole double-throw switch S1, an output end of the upper hysteresis comparator is connected with an output end of the lower hysteresis comparator and the other throw of a single-pole double-throw switch S1, and the single-pole double-throw switch S1 is connected with a collector and a base of the triode Q1, The other end of the fourth resistor R4 is connected to ground, and the non-inverting input terminal of the lower hysteresis comparator is connected to a reference voltage.
Adopt the utility model discloses afterwards, with multichannel control circuit integration in an organic whole, simplify the circuit, reduce chip area, synthesize the characteristics of various single power supply state judgement methods, according to the advantage complementary, make the power supply state when going up the electricity or state such as unusual, can make whole power supply system's stability obtain the promotion that is showing, with low costs.
Drawings
FIG. 1 is a prior art schematic;
FIG. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a schematic diagram of the control principle of the present invention.
Detailed Description
Referring to fig. 2, a power supply state determining device includes two current sources arranged in parallel, one end of the two current sources is connected with a first resistor R1 and a power supply, the other end of the first resistor R1 is connected with one end of a second resistor, the other end of the second resistor is connected with a non-inverting input terminal of an upper hysteresis comparator and one end of a third resistor R3, the other end of the third resistor R3 is connected with an inverting input terminal of a lower hysteresis comparator and one end of a fourth resistor R4, the other ends of the two current sources are connected with one end of a fifth resistor R5 and an inverting input terminal of the upper hysteresis comparator, the other end of the fifth resistor R5 is connected with an emitter of a triode Q1 and one throw of a single-pole double-throw switch S1, an output terminal of the upper hysteresis comparator is connected with an output terminal of the lower hysteresis comparator and the other throw of a single-pole double-throw switch S1, the single-pole double-throw switch S1 is connected with the collector and the base of the triode Q1, the other end of the fourth resistor R4 and grounded, and the non-inverting input end of the lower hysteresis comparator is connected with a reference voltage.
Firstly, comparing a power supply with a reference power supply through resistance voltage division, and if the voltage division value is smaller than the reference voltage, outputting to be low and the equipment does not work; if the output voltage is greater than the reference voltage, the output voltage of the hysteresis comparator is high, the upper hysteresis comparator is enabled, and the lower switch is closed, so that the element with the negative temperature coefficient, such as a bipolar junction transistor, works, and the current source works.
When the power supply voltage changes very little, when the temperature rises, the level of the negative terminal of the upper hysteresis comparator falls, so that the output is switched from low to high, and the equipment stops working; when the temperature drops, the level of the negative terminal of the upper hysteresis comparator rises and is restored to be higher than the comparison value, so that the output is switched from high to low, and the equipment is enabled to resume working.
When the power supply voltage changes very little, when the temperature rises, the level of the negative terminal of the upper hysteresis comparator falls, so that the output is switched from low to high, and the equipment stops working; when the temperature drops, the level of the negative terminal of the upper hysteresis comparator rises and is restored to be higher than the comparison value, so that the output is switched from high to low, and the equipment is enabled to resume working.
When the power supply voltage changes very little, when monitoring the current, the level of the negative terminal of the upper hysteresis comparator is reduced, so that the output is switched from low to high, and the equipment stops working; when the temperature drops, the level of the negative terminal of the upper hysteresis comparator rises and is restored to be higher than the comparison value, so that the output is switched from high to low, and the equipment is enabled to resume working.
As shown in fig. 3, the device starts to be powered on, enters an undervoltage judgment stage, and if the output is low, the device is still undervoltage, and does not work; if the output is high, the device enters a subsequent state, if the device enters an abnormal stage such as overvoltage, overtemperature or overcurrent, the device does not work, and the device normally works under other conditions.
Claims (1)
1. A power supply state judging device is characterized by comprising two current sources which are arranged in parallel, wherein one ends of the two current sources are connected with a first resistor R1 and a power supply, the other end of the first resistor R1 is connected with one end of a second resistor, the other end of the second resistor is connected with a positive phase input end of an upper hysteresis comparator and one end of a third resistor R3, the other end of the third resistor R3 is connected with an inverse phase input end of a lower hysteresis comparator and one end of a fourth resistor R4, the other ends of the two current sources are connected with one end of a fifth resistor R5 and an inverse phase input end of the upper hysteresis comparator, the other end of the fifth resistor R5 is connected with an emitter of a triode Q1 and one throw of a single-pole double-throw switch S1, an output end of the upper hysteresis comparator is connected with an output end of the lower hysteresis comparator and the other throw of a single-pole double-throw switch S1, and the single-pole double-throw switch S1 is connected with a collector and a base of the triode Q1, The other end of the fourth resistor R4 is connected to ground, and the non-inverting input terminal of the lower hysteresis comparator is connected to a reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023297017.8U CN214278295U (en) | 2020-12-31 | 2020-12-31 | Power supply state judging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023297017.8U CN214278295U (en) | 2020-12-31 | 2020-12-31 | Power supply state judging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214278295U true CN214278295U (en) | 2021-09-24 |
Family
ID=77786039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023297017.8U Active CN214278295U (en) | 2020-12-31 | 2020-12-31 | Power supply state judging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214278295U (en) |
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2020
- 2020-12-31 CN CN202023297017.8U patent/CN214278295U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221229 Address after: No. 295, Building 17, No. 2723, Fuchunwan Avenue, Chunjiang Street, Fuyang District, Hangzhou, Zhejiang, 310000 Patentee after: Hangzhou Sitai Microelectronics Co.,Ltd. Address before: 214028 No.16 Changjiang Road, Xinwu District, Wuxi City, Jiangsu Province Patentee before: STEADICHIPS Inc. |