阅读说明：本技术 一种供电状态判断装置 (Power supply state judging device ) 是由 赵祥桂 马辉 于 2020-12-31 设计创作，主要内容包括：本发明属于电源领域,具体为一种供电状态判断装置,其能够简化短路,减少芯片面积,降低成本,其包括两个并联布置的电流源,两个电流源一端与第一电阻R1、电源连接,第一电阻R1另一端连接第二电阻一端,第二电阻另一端连接上部迟滞比较器的正相输入端和第三电阻R3的一端,第三电阻R3另一端连接下部迟滞比较器的反相输入端和第四电阻R4一端,两个电流源另一端连接第五电阻R5一端、上部迟滞比较器的反相输入端,第五电阻R5另一端连接三极管Q1的发射极、单刀双掷开关S1的一个掷点,上部迟滞比较器的输出端连接下部迟滞比较器的输出端、单刀双掷开关S1的另一个掷点,单刀双掷开关S1连接三极管Q1的集电极和基极、第四电阻R4另一端并接地。(The invention belongs to the field of power supplies, 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, wherein one end of each current source is connected with a first resistor R1 and a power supply, the other end of a 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 a third resistor R3 is connected with an inverted 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 the inverted 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 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, 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.)

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 the 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, 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.

Technical Field

The invention belongs to the field of power supplies, and particularly relates to a power supply state judgment 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.

Disclosure of Invention

In order to solve the problems of complex circuit structure, large chip area occupation and high cost in the prior art, the invention provides a power supply state judgment device which can simplify short circuit, reduce chip area and 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 the 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, 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.

After the power supply state judging method is adopted, a plurality of control circuits are integrated into a whole, the circuit is simplified, the area of a chip is reduced, the characteristics of various single power supply state judging methods are integrated, and according to the advantage complementation, the stability of the whole power supply system can be obviously improved when the power supply state is in a power-on state or an abnormal state and the like, and the cost is low.

Drawings

FIG. 1 is a prior art schematic;

FIG. 2 is a schematic diagram of the circuit 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.