CN213482679U

CN213482679U - Power output port state monitoring circuit

Info

Publication number: CN213482679U
Application number: CN202022926678.6U
Authority: CN
Inventors: 王祯鑫; 李海洋; 花磊
Original assignee: Dalian Institute of Chemical Physics of CAS
Current assignee: Dalian Institute of Chemical Physics of CAS
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-06-18
Anticipated expiration: 2030-12-07

Abstract

The utility model relates to a power output port state monitoring circuit constitutes the four ways branch road of being connected respectively with the load through a microcontroller, a plurality of optoelectronic coupler, a hall current sensor, a power MOSFET pipe, a plurality of pull-up resistance, a plurality of current-limiting resistance, a plurality of filter capacitance, a fuse F1: the load current feedback circuit comprises a control load conduction circuit, a load input voltage feedback circuit, a load output voltage feedback circuit and a load current feedback circuit. The utility model discloses can feed back load consumption current to microcontroller through hall current sensor when providing heavy current switch control to monitoring power MOSFET input voltage and output voltage state, whether be used for judging power MOSFET breaks down, be used for system self-checking and failure diagnosis.

Description

Power output port state monitoring circuit

Technical Field

The utility model relates to a switching circuit technical field. The utility model relates to a power output port state monitoring circuit.

Background

The power electronic switch and the state monitoring circuit are widely applied to the field of automatic control, and the circuit component is an indispensable component of a control system, is used for providing control power output for external equipment by the control system, and is a key influence factor for normal work of the external equipment and safe operation of the control system.

The existing scheme is basically to connect a small-resistance power resistor in series in a current loop and detect the load current by a method of dividing and amplifying the resistor and then detecting the load current.

SUMMERY OF THE UTILITY MODEL

To prior art not enough, the utility model relates to a power output port state monitoring circuit can be when as high-power electronic switch control external equipment, providing the enough heavy current of load, and real time monitoring external equipment's operating current carries out real time supervision to input and output voltage state and load consumption current to feedback to microprocessor realizes the real time monitoring of port electric current, voltage, makes power output port have the fault detection function, improves control system's intelligent degree.

The utility model discloses technical scheme as follows:

a power output port state monitoring circuit comprises four branches respectively connected with a load: the load current feedback circuit is connected with the load input voltage feedback circuit;

the control load conduction circuit comprises a microcontroller U1, a photoelectric coupler U2 and a power MOSFET Q1; the load input voltage feedback circuit comprises a photoelectric coupler U3, a fuse F1 and a microcontroller U1; the load output voltage feedback circuit comprises a photoelectric coupler U4, a power MOSFET tube Q1 and a microcontroller U1; the load current feedback circuit comprises a Hall current sensor U5, a power MOSFET Q1 and a microcontroller U1.

The connection relationship of the load conduction control circuit is as follows:

a 20 th pin of the microcontroller U1 is connected to a power supply VCC port; a 9 th pin of the microcontroller U1 is connected to an input side K port of the photoelectric coupler U2; an input side A port of the photoelectric coupler U2 is connected to a first port of the current limiting resistor R1; a second port of the current limiting resistor R1 is connected to a power supply VCC port; an output side E port of the photoelectric coupler U2 is connected to a power supply GND port; an output side C port of the photoelectric coupler U2 is connected to a first port of the current limiting resistor R7; the second port of the current limiting resistor R7 is connected to the 4 th pin of the power MOSFET Q1, and is also connected to the first port of the pull-up resistor R6; the second ports of the pull-up resistors R6 are connected to the 1 st to 3 rd pins of the power MOSFET Q1, respectively.

The connection relation of the load input voltage feedback circuit is as follows:

pins 1 to 3 of a power MOSFET Q1 are connected to a first port of a fuse F1, and a second port of the fuse F1 is connected to a power supply VIN port; an output side E port of the photoelectric coupler U3 is connected to a power supply GND port, and an output side C port of the photoelectric coupler U3 is connected to a first port of a pull-up resistor R2 and is also connected to a 6 th pin of the microcontroller U1; the second port of the pull-up resistor R2 is connected to the power supply VCC port; a secondary input side K port of the photoelectric coupler U3 is connected to a power supply GND port; an input side A port of the photoelectric coupler U3 is connected to a first port of a current limiting resistor R3, and second ports of current limiting resistors R3 are connected to the 5 th to 8 th pins of a power MOSFET Q1 respectively.

The connection relation of the load output voltage feedback circuit is as follows:

the 1 st to 3 rd pins of a power MOSFET Q1 are simultaneously connected to a first port of a current-limiting resistor R5, and a second port of the current-limiting resistor R5 is connected to an input side A port of a photoelectric coupler U4; an input side K port of the photoelectric coupler U4 is connected to a power supply GND port, and an output side E port of the photoelectric coupler U4 is connected to the power supply GND port; the output side C port of the photoelectric coupler U4 is connected to the first port of the pull-up resistor R4 and is also connected to the 7 th pin of the microcontroller U1; the second port of pull-up resistor R4 is connected to the supply VCC port.

The connection relationship of the load current feedback circuit is as follows:

pins 5 to 8 of a power MOSFET Q1 are connected to a pin 3 and a pin 4 of a Hall current sensor U5 respectively; the 1 st pin and the 2 nd pin of the Hall current sensor U5 are connected and are connected to a current output VOUT port; a 5 th pin of the Hall current sensor U5 is respectively connected to a first port of a filter capacitor C1 and a first port of a filter capacitor C2, and is also connected to a power supply GND port; a 6 th pin of the Hall current sensor U5 is connected to a second port of the filter capacitor C2; the 7 th pin of the Hall current sensor U5 is connected to the 13 th pin of the microprocessor U1; the 8 th pin of the Hall current sensor U5 is connected to the second port of the filter capacitor C1 and is also connected to the power supply VCC port.

The microcontroller U1 controls the input end of the photoelectric coupler U2 to be switched on and off, and further controls the power MOSFET Q1 to be switched on and off through the output end of the photoelectric coupler U2. The voltage passing through the fuse F1 is detected by the input end of the photoelectric coupler U3, and then is fed back to the microcontroller U1 through the output end of the photoelectric coupler U3. The voltage passing through the power MOSFET tube Q1 is detected by the input end of the photoelectric coupler U4, and then is fed back to the microcontroller U1 through the output end of the photoelectric coupler U4. The current flowing through the power MOSFET Q1 is sensed by a hall current sensor U5 and fed back to the microcontroller U1.

The utility model discloses following beneficial effect and effect have:

1. the utility model discloses a hall current sensor detects load consumption current, has eliminated the power loss who uses the sampling resistance scheme, and the invalid consumption of very big reduction system alleviates the heat dissipation burden of system.

2. The utility model discloses a photoelectric coupler carries out voltage detection to the input and the output of power MOSFET pipe to with detected signal feedback to microcontroller, judge current load operating condition through detecting the logic by microcontroller, judge the fault point fast and provide data support when the system goes wrong.

Drawings

FIG. 1 is a circuit diagram of a power output port status monitor;

the intelligent power supply comprises a U1 microcontroller, U2, U3 and U4 are photocouplers, U5 is a Hall current sensor, Q1 is a power MOSFET, F1 is a fuse, C1 and C2 are filter capacitors, R1, R3, R5 and R7 are current-limiting resistors, and R2, R4 and R6 are pull-up resistors.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many other forms than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1, a power output port status monitoring circuit has the following connection relationship:

the 9 th pin of the microcontroller U1 is connected to the input side K port of the opto-coupler U2. An input side A port of the photoelectric coupler U2 is connected to a first port of a current limiting resistor R1. The second port of the current limiting resistor R1 is connected to the supply VCC port. Pin 20 of the microcontroller U1 is connected to the supply VCC port.

An output side E port of the photocoupler U2 is connected to the power supply GND port. An output side C port of the photocoupler U2 is connected to a first port of the current limiting resistor R7. The second port of the current limiting resistor R7 is connected to the 4 th pin of the power MOSFET Q1 and to the first port of the pull-up resistor R6. The second port of the pull-up resistor R6 is connected to the 1 st to 3 rd pins of the power MOSFET Q1, respectively, and is also connected to the first port of the current limiting resistor R5, and is also connected to the first port of the fuse F1. A second port of the current limiting resistor R5 is connected to the input side a port of the photocoupler U4. An input side K port of the photocoupler U4 is connected to the power supply GND port. The second port of the fuse F1 is connected to the power VIN port to collect external power. An output side E port of the photocoupler U4 is connected to the power supply GND port. The output side C port of the photocoupler U4 is connected to the first port of the pull-up resistor R4 and also to the 7 th pin of the microcontroller U1. The second port of pull-up resistor R4 is connected to the supply VCC port.

An output side E port of the photoelectric coupler U3 is connected to a power supply GND port, and an output side C port of the photoelectric coupler U3 is connected to a first port of a pull-up resistor R2 and is also connected to a 6 th pin of the microcontroller U1. The second port of pull-up resistor R2 is connected to the supply VCC port. The primary input side K port of the photocoupler U3 is connected to the power supply GND port. An input side A port of the photoelectric coupler U3 is connected to a first port of a current limiting resistor R3, and a second port of a current limiting resistor R3 is respectively connected to pins 5 to 8 of a power MOSFET Q1 and is simultaneously respectively connected to a pin 3 and a pin 4 of a Hall current sensor U5.

The 1 st pin and the 2 nd pin of the Hall current sensor U5 are connected and are also connected to a current output VOUT port, and the VOUT port is connected with an external load. The 5 th pin of the Hall current sensor U5 is respectively connected to the first port of the filter capacitor C1 and the first port of the filter capacitor C2, and is also connected to the power supply GND port. The 6 th pin of the Hall current sensor U5 is connected to the second port of the filter capacitor C2. Pin 7 of the hall current sensor U5 is connected to pin 13 of the microprocessor U1. The 8 th pin of the Hall current sensor U5 is connected to the second port of the filter capacitor C1 and is also connected to the power supply VCC port.

Example 1

A power output port state monitoring circuit is characterized in that an STC series STC12C5616 microcontroller is adopted in U1, a TLP series TLP181 photoelectric coupler is adopted in U2, U3 and U4, an ACS712 Hall current sensor is adopted in U5, a CEM4435 power MOSFET is adopted in Q1, a C1 value is 0.1uF, a C2 value is 0.1uF, an R1 value is 820 omega, an R2 value is 10K omega, an R3 value is 4.7K omega, an R4 value is 10K omega, an R5 value is 4.7K omega, an R6 value is 100K omega, and an R7 value is 100 omega.

The microcontroller U1 drives the power MOSFET Q1 through the photoelectric coupler U2 by the control signal, thus realizing the on-off control of the load. The voltage signal passing through the fuse F1 is fed back to the microcontroller U1 by the photoelectric coupler U4 for detecting whether the fuse F1 is damaged. The output voltage signal of the power MOSFET is fed back to the microcontroller U1 by the photoelectric coupler U3, and the output voltage signal is used for detecting whether the power MOSFET Q1 is damaged or not. The current flowing through the power MOSFET, i.e. the load current, is fed back to the microcontroller U1 by the Hall current sensor U5 for determining the load working condition.

The microcontroller U1 judges the feedback signal, if the photoelectric coupler U3, the photoelectric coupler U4 and the Hall current sensor U5 have no feedback signal, the fuse F1 is judged to be damaged; if the photoelectric coupler U3 has a feedback signal, the photoelectric coupler U4 and the Hall current sensor U5 do not have the feedback signal, and the power MOSFET Q1 is judged to be damaged; if the photoelectric coupler U3 and the photoelectric coupler U4 have feedback signals, the Hall current sensor U5 does not have the feedback signals, and the load is judged to be disconnected; if the photoelectric coupler U3 and the photoelectric coupler U4 have no feedback signals, the feedback signals of the Hall current sensor U5 exceed the set range, and the load is judged to be short-circuited; if the photoelectric coupler U3 and the photoelectric coupler U4 have feedback signals, the feedback signals of the Hall current sensor U5 do not exceed the set measuring range, and the state is judged to be normal.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should be regarded as the protection scope of the present invention.

Claims

1. A power output port state monitoring circuit is characterized by comprising four branches respectively connected with a load: the load current feedback circuit is connected with the load input voltage feedback circuit;

2. The power output port status monitor circuit according to claim 1, wherein the connection relationship of the load conduction control circuit is:

3. The power output port status monitor circuit according to claim 1, wherein the load input voltage feedback circuit connection relationship is:

4. A power output port status monitoring circuit according to claim 1, wherein: the connection relation of the load output voltage feedback circuit is as follows:

5. The power output port status monitor circuit according to claim 1, wherein the load current feedback circuit connection relationship is: