CN213069121U

CN213069121U - Power output voltage detection device

Info

Publication number: CN213069121U
Application number: CN202022038504.6U
Authority: CN
Inventors: 刘剑滨; 李莎; 张喆
Original assignee: Wuxi Taihu University
Current assignee: Wuxi Taihu University
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-04-27
Anticipated expiration: 2030-09-16

Abstract

The utility model relates to a power supply detection area discloses a power output voltage detection device, including switch K1, resistance R1, R2, R3, R4, voltage comparator CMP1, CMP2, photoelectric coupler U1, U2, pilot lamp LED1, LED2, first time relay and second time relay; the voltage comparator CMP1 is used for detecting whether the output voltage of the power supply is higher than the reference voltage VH, the voltage comparator CMP2 is used for detecting whether the output voltage of the power supply is too low, when detection is carried out, only in the delay time of the first time relay and the second time relay, the voltage comparator CMP1 and the voltage comparator CMP2 continuously output high level signals, and the indicator light LED1 or the indicator light LED2 is lighted for prompting, so that the occurrence of false detection can be avoided.

Description

Power output voltage detection device

Technical Field

The utility model relates to a power supply detection area, concretely relates to power output voltage detection device.

Background

In the process of using a power supply such as a lithium battery, the capacitance of the power supply is reduced along with continuous charging and discharging, if the output voltage of the power supply is too low, the power supply may not drive a load when in use, and particularly for the field of power protection, if the power supply cannot drive switching elements such as a relay, a microcomputer protection device cannot normally cut off a power supply circuit when power parameters are abnormal, so that a power accident is caused, and therefore the output voltage of the power supply in use needs to be detected.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of background art, the utility model provides a power output voltage detection device detects the output voltage of the power in the use, selects unqualified power, avoids appearing the electric power accident because of the power is unusual.

For solving the technical problem, the utility model provides a following technical scheme: a power output voltage detection device comprises a switch K1, resistors R1, R2, R3, R4, a voltage comparator CMP1, a CMP2, photoelectric couplers U1 and U2, an indicator light LED1, an LED2, a first time relay and a second time relay;

one end of a switch K1 is electrically connected with the positive electrode of a power supply, the other end of the switch K1 is electrically connected with the positive input end of a voltage comparator CMP1 through a resistor R1 and is electrically connected with the positive input end of a voltage comparator CMP2 through a resistor R3, the negative input end of the voltage comparator CMP1 is connected with a reference voltage VH, and the negative input end of the voltage comparator CMP2 is connected with a reference voltage VL;

the output end of a voltage comparator CMP1 is electrically connected with the positive input end of the primary side of a photoelectric coupler U1 through a resistor R2, the negative input end of the primary side of the photoelectric coupler U1 is grounded, the collector of the secondary side of the photoelectric coupler U1 is connected with a driving voltage, the emitter of the secondary side of the photoelectric coupler U1 is electrically connected with the coil of a first time relay, the driving voltage is electrically connected with one end of an indicator light LED1 through the normally open contact of the first time relay, and the other end of the indicator light LED1 is grounded;

the output of voltage comparator CMP2 is connected with the positive input end electricity on the former avris of photocoupler U2 through resistance R4, the negative input end ground connection on the former avris of photocoupler U2, the collecting electrode access drive voltage on the vice avris of photocoupler U2, the projecting pole on the vice avris of photocoupler U2 is connected with the coil electricity of second time relay, drive voltage is connected with pilot lamp LED2 one end electricity through the normally open contact of second time relay, the other end ground connection of pilot lamp LED 2.

Further, the utility model discloses still include third time relay, the positive normal close contact through third time relay of power is connected with switch K1 one end electricity, and the switch K1 other end is connected with third time relay's coil electricity.

The detection time length of the power supply can be set through the third time relay, and if the output voltage of the power supply is between the reference voltage VH and the reference voltage VL within the delay time of the third time relay, the third time relay acts to automatically disconnect the positive pole of the power supply from the switch K1.

The working principle of the utility model is as follows: the voltage comparator CMP1 is used to detect whether the output voltage of the power supply is higher than the reference voltage VH, and the voltage comparator CMP2 is used to detect whether the output voltage of the power supply is too low; when the voltage comparator CMP1 outputs a high level signal, the diode on the primary side of the photoelectric coupler U1 is conducted, the triode on the secondary side of the photoelectric coupler U1 is conducted at the moment, the coil of the first time relay is connected with a driving voltage, timing is started, if the triode on the secondary side of the photoelectric coupler U1 is continuously conducted in the delay time of the first time relay, the normally open contact of the first time relay is closed, the indicator light LED1 is lightened, the output voltage of a power supply is too high, an abnormality exists, similarly, if the triode on the secondary side of the photoelectric coupler U2 is continuously conducted in the delay time of the second time relay, the normally open contact of the second time relay is closed, the indicator light LED2 is lightened, and the output voltage of the power supply is too low, and the abnormality exists.

Compared with the prior art, the utility model beneficial effect who has is: the utility model discloses simple structure, whether too high or low excessively of output voltage that can detect the power simultaneously, in addition in order to eliminate the output voltage of power and to appear the false retrieval that causes in the twinkling of an eye when unusual, carry out the time delay to voltage comparator CMP1 and voltage comparator CMP 2's output signal respectively through first time relay and second time relay, only in the time delay in the continuous output high level signal of voltage comparator CMP1 and voltage comparator CMP2, the suggestion just sends out of pilot lamp LED1 or pilot lamp LED2, can realize power and drive voltage's isolation through optoelectronic coupler U1 and U2 at last, avoid there being the interference.

Drawings

The utility model discloses there is following figure:

FIG. 1 is a circuit diagram of a voltage detection circuit in an embodiment;

fig. 2 is a circuit diagram showing the connection of the positive electrode of the power supply to the switch K1 through the normally closed contact of the third time relay in the embodiment.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a power output voltage detection device includes a switch K1, resistors R1, R2, R3, R4, voltage comparators CMP1, CMP2, photocouplers U1, U2, an indicator light LED1, an LED2, a first time relay, and a second time relay;

one end of a switch K1 is electrically connected with a power supply positive electrode V +, the other end of the switch K1 is electrically connected with the positive input end of a voltage comparator CMP1 through a resistor R1 and is electrically connected with the positive input end of a voltage comparator CMP2 through a resistor R3, the negative input end of the voltage comparator CMP1 is connected with a reference voltage VH, and the negative input end of the voltage comparator CMP2 is connected with a reference voltage VL;

the output end of a voltage comparator CMP1 is electrically connected with the positive input end of the primary side of a photoelectric coupler U1 through a resistor R2, the negative input end of the primary side of the photoelectric coupler U1 is grounded, the collector of the secondary side of the photoelectric coupler U1 is connected with a driving voltage, the emitter of the secondary side of the photoelectric coupler U1 is electrically connected with a coil KT1 of a first time relay, the driving voltage is electrically connected with one end of an indicator light LED1 through a normally open contact KM1 of the first time relay, and the other end of the indicator light LED1 is grounded;

the output of voltage comparator CMP2 passes through resistance R4 and is connected with the positive input end electricity on the former avris of optoelectronic coupler U2, the negative input end ground connection on the former avris of optoelectronic coupler U2, the collecting electrode access drive voltage of the vice avris of optoelectronic coupler U2, the projecting pole of the vice avris of optoelectronic coupler U2 is connected with the coil KT2 electricity of second time relay, drive voltage is connected with pilot lamp LED2 one end electricity through the normally open contact KM2 of second time relay, the other end ground connection of pilot lamp LED 2.

In this embodiment, the driving voltage is 24V dc voltage.

Particularly, the utility model discloses still include third time relay, the anodal V + of power is connected with switch K1 one end electricity through third time relay's normally closed contact KM3, and the switch K1 other end is connected with third time relay's coil KM3 electricity.

The detection time length of the power supply can be set through the third time relay, and if the output voltage of the power supply is between the reference voltage VH and the reference voltage VL within the delay time of the third time relay, the third time relay acts to automatically disconnect the positive pole of the power supply from the switch K1, and the detection is finished.

The working principle of the utility model is as follows: the voltage comparator CMP1 is used to detect whether the output voltage of the power supply is higher than the reference voltage VH, and the voltage comparator CMP2 is used to detect whether the output voltage of the power supply is too low; when the voltage comparator CMP1 outputs a high-level signal, the diode on the primary side of the photoelectric coupler U1 is turned on, the triode on the secondary side of the photoelectric coupler U1 is turned on at the moment, the coil KT1 of the first time relay is connected to a driving voltage, timing is started, if the triode on the secondary side of the photoelectric coupler U1 is continuously turned on within the delay time of the first time relay, the normally open contact KM1 of the first time relay is closed, the indicator light LED1 is lightened, the output voltage of the power supply is too high and abnormal, and similarly, if the triode on the secondary side of the photoelectric coupler U2 is continuously turned on within the delay time of the second time relay, the normally open contact KM2 of the second time relay is closed, the indicator light LED2 is lightened, and abnormal output voltage exists if the output voltage of the power supply is too low.

Compared with the prior art, the utility model has the advantages of simple structure, whether too high or low excessively of output voltage that can detect the power simultaneously, in addition in order to eliminate the output voltage of power and to appear the false retrieval that causes in the twinkling of an eye when unusual, carry out the time delay to voltage comparator CMP1 and voltage comparator CMP 2's output signal respectively through first time relay and second time relay, only in the time delay in voltage comparator CMP1 and voltage comparator CMP 2's continuous output high level signal, the suggestion just is sent out to pilot lamp LED1 or pilot lamp LED2, can realize power and drive voltage's isolation through optoelectronic coupler U1 and U2 at last, avoid having the interference.

In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A kind of power output voltage checkout gear, characterized by that: the device comprises a switch K1, resistors R1, R2, R3, R4, a voltage comparator CMP1, CMP2, photoelectric couplers U1 and U2, an indicator light LED1, an LED2, a first time relay and a second time relay;

one end of the switch K1 is electrically connected with the positive electrode of the power supply, the other end of the switch K1 is electrically connected with the positive input end of a voltage comparator CMP1 through a resistor R1 and is electrically connected with the positive input end of a voltage comparator CMP2 through a resistor R3, the negative input end of the voltage comparator CMP1 is connected with a reference voltage VH, and the negative input end of the voltage comparator CMP2 is connected with a reference voltage VL;

the output end of the voltage comparator CMP1 is electrically connected with the positive input end of the primary side of a photoelectric coupler U1 through a resistor R2, the negative input end of the primary side of the photoelectric coupler U1 is grounded, the collector electrode of the secondary side of the photoelectric coupler U1 is connected with a driving voltage, the emitter electrode of the secondary side of the photoelectric coupler U1 is electrically connected with a coil of a first time relay, the driving voltage is electrically connected with one end of an indicator light LED1 through a normally open contact of the first time relay, and the other end of the indicator light LED1 is grounded;

the output of voltage comparator CMP2 passes through resistance R4 and is connected with the positive input end electricity on the former avris of optoelectronic coupler U2, the negative input end ground connection on the former avris of optoelectronic coupler U2, the collecting electrode on the vice avris of optoelectronic coupler U2 inserts driving voltage, the projecting pole on the vice avris of optoelectronic coupler U2 is connected with the coil electricity of second time relay, driving voltage is connected with pilot lamp LED2 one end electricity through the normally open contact of second time relay, and the other end ground connection of pilot lamp LED 2.

2. The power supply output voltage detection device according to claim 1, wherein: the power supply is characterized by further comprising a third time relay, the positive pole of the power supply is electrically connected with one end of the switch K1 through a normally closed contact of the third time relay, and the other end of the switch K1 is electrically connected with a coil of the third time relay.