CN212008876U - Circuit for monitoring working state of switching power supply - Google Patents
Circuit for monitoring working state of switching power supply Download PDFInfo
- Publication number
- CN212008876U CN212008876U CN202020222340.XU CN202020222340U CN212008876U CN 212008876 U CN212008876 U CN 212008876U CN 202020222340 U CN202020222340 U CN 202020222340U CN 212008876 U CN212008876 U CN 212008876U
- Authority
- CN
- China
- Prior art keywords
- power supply
- detection module
- switching power
- resistor
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a circuit for monitoring switching power supply operating condition, simple structure easily realizes, switching power supply output current detection module and switching power supply output voltage detection module's setting, be convenient for know during operation switching power supply's output current, the output voltage condition, temperature detection module's setting, be convenient for know the ambient temperature that during operation switching power supply located, PWM ripples pulse width detection module's setting, be convenient for know during operation switching power supply the PWM ripples pulsewidth of control switch pipe break-make, switching tube current detection module's setting, be convenient for know during operation switching power supply the electric current size of flow through the switching tube, whether there is quality defect, find potential risk.
Description
Technical Field
The utility model relates to a circuit for monitoring switching power supply operating condition.
Background
In the secondary equipment of the power system, a switching power supply is often adopted for supplying power, the switching power supply is a power circuit, the switching power supply works in a high-voltage, large-current and high-temperature state for a long time, if some key devices have quality defects or because the thermal design is unreasonable, the performance of the devices can be degraded under the action of long-term electrical stress, and if the performance change cannot be found in time and maintained and replaced, the power supply finally fails, and the device cannot normally operate. In the prior art, only the output current or the output voltage is detected generally, and whether quality defects exist in key devices in the switching power supply or whether thermal design is unreasonable or not can not be well known.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned technique is not enough, provides a circuit for monitoring switching power supply operating condition.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a circuit for monitoring the working state of a switching power supply comprises a switching power supply output current detection module 1, a switching power supply output voltage detection module 2, a temperature detection module 3 for detecting the ambient temperature, a PWM wave pulse width detection module 4 for detecting the pulse width of a PWM wave for controlling the on-off of a switching tube in the switching power supply, a switching tube current detection module 5 for detecting the current flowing through the switching tube in the switching power supply, and a processor 6 for processing the detection data, the detection signal output end of the switching power supply output current detection module 1, the detection signal output end of the switching power supply output voltage detection module 2, the detection signal output end of the temperature detection module 3, the detection signal output end of the PWM wave pulse width detection module 4 and the detection signal output end of the switching tube current detection module 5 are respectively connected with the processor 6.
In the circuit for monitoring the operating state of the switching power supply, the switching power supply output current detection module 1 adopts the current sensor U1 with the chip model number ACS758, the 4 th pin of the current sensor U1 is used as a detection current input end, the 5 th pin is used as a detection current output end, and the 3 rd pin is used as a detection signal output end of the switching power supply output current detection module 1 and connected with the processor 6.
The circuit for monitoring the working state of the switching power supply comprises a resistor R1, a resistor R2 and an operational amplifier U3A with the model MCP6022, wherein the resistor R1 is connected with the output voltage detection module 2 of the switching power supply, one end of the resistor R1 is used as the voltage input positive connection end of the switching power supply output voltage detection module 2 and is connected with the voltage output positive connection end of the switching power supply, the other end of the resistor R1 is connected with one end of the resistor R2 and the non-inverting input end of the operational amplifier U3A, the other end of the resistor R2 is used as the voltage input negative connection end of the switching power supply output voltage detection module 2 and is connected with the voltage output negative connection end of the switching power supply, and the inverting input end of the operational amplifier U3A is connected with the operational amplifier output end and then is used as the detection signal output end of the switching power supply output voltage detection module 2 to be connected with the processor 6.
The circuit for monitoring the working state of the switching power supply comprises a temperature detection module 3, an operational amplifier U3B with the model of MCP6022, a thermistor RT and a resistor R3, wherein one end of the resistor R3 is connected with +5V voltage, the other end of the resistor R3 is connected with one end of the thermistor RT and the non-inverting input end of the operational amplifier U3B, the other end of the thermistor RT is grounded, and the inverting input end of the operational amplifier U3B is connected with the operational amplifier output end to serve as the detection signal output end of the temperature detection module 3 and connected with the processor 6.
The circuit for monitoring the working state of the switching power supply comprises a resistor R4, a resistor R5 and an optocoupler U4 with a model number of 4N25, wherein one end of the resistor R5 is used as a voltage input positive connecting end of the PWM wave pulse width detection module 4 and is connected with a PWM control pulse output end of the switching power supply for controlling the on-off of a switching tube, the other end of the resistor R5 is connected with a light emitting diode positive electrode of the optocoupler U4, a light emitting diode negative electrode of the optocoupler U4 is used as a voltage input negative connecting end of the PWM wave pulse width detection module 4 and is connected with a switching power supply input common end, a collector electrode of a receiving tube of the optocoupler U4 is connected with one end of the resistor R4 and then is used as a detection signal output end of the PWM wave pulse width detection module 4 and is connected with the processor 6, and the other end of the resistor R4 is connected with a voltage of 3.3V, and the emitter of a receiving tube in the optical coupler U4 is grounded.
In the above circuit for monitoring the operating state of the switching power supply, the switching tube current detection module 5 employs a current sensor U2 with a chip model of ACS758, a 4 th pin of the current sensor U2 is used as a detection current input terminal, a 5 th pin is used as a detection current output terminal, and a 3 rd pin is used as a detection signal output terminal of the switching tube current detection module 5 and connected to the processor 6.
In the circuit for monitoring the operating state of the switching power supply, the processor 6 adopts an MCU of a model STM32G 031.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the present case simple structure easily realizes, switching power supply output current detection module and switching power supply output voltage detection module's setting is convenient for know during operation switching power supply's output current, output voltage condition, the ambient temperature that during operation switching power supply was located is convenient for know in the setting of temperature detection module, PWM ripples pulse width detection module's setting is convenient for know the PWM ripples pulse width of control switch pipe break-make in the switching power supply of during operation, whether there is quality defect, discovery potential risk in the setting of switching tube current detection module, the current size of the switching tube that flows through in the switching power supply of being convenient for know during operation.
2. The resistor R1 and the resistor R2 in the switching power supply output voltage detection module form a resistor voltage dividing circuit, so that the output voltage of the switching power supply is in a proportional relation with the voltage of the non-inverting input end of the operational amplifier U3A, then signal amplification is carried out through the operational amplifier U3A, the measurement of a small signal of a mV level in the output voltage is facilitated, and finally the small signal is output to the processor, so that the output voltage and ripple change conditions of the switching power supply are detected, the working state of an electrolytic capacitor connected to the output end of the switching power supply can be indirectly known through detecting the ripple change conditions, whether the performance of the capacitor is reduced or not is indirectly known, and the early diagnosis effect is achieved.
Drawings
Fig. 1 is a circuit diagram of the present case.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of examples to facilitate understanding by those skilled in the art:
as shown in fig. 1, a circuit for monitoring the operating state of a switching power supply includes a switching power supply output current detection module 1, a switching power supply output voltage detection module 2, a temperature detection module 3 for detecting the ambient temperature, a PWM wave pulse width detection module 4 for detecting the pulse width of a PWM wave controlling the on/off of a switching tube in the switching power supply, a switching tube current detection module 5 for detecting the magnitude of current flowing through the switching tube in the switching power supply, and a processor 6 for processing the detected data, the detection signal output end of the switching power supply output current detection module 1, the detection signal output end of the switching power supply output voltage detection module 2, the detection signal output end of the temperature detection module 3, the detection signal output end of the PWM wave pulse width detection module 4 and the detection signal output end of the switching tube current detection module 5 are respectively connected with the processor 6.
As mentioned above, the present case simple structure easily realizes, switching power supply output current detection module 1 and switching power supply output voltage detection module 2's setting is convenient for know the output current of during operation switching power supply, the output voltage condition, the ambient temperature that during operation switching power supply was located is convenient for know to the setting of temperature detection module 3, the setting of PWM ripples pulse width detection module 4 is convenient for know the PWM ripples pulse width of control switch tube break-make in the during operation switching power supply, the setting of switch tube current detection module 5 is convenient for know the electric current size that flows through the switch tube in the during operation switching power supply, whether has the quality defect, discovery potential risk.
As described above, in specific implementation, the switching power supply output current detection module 1 employs the current sensor U1 with the chip model of ACS758, the 4 th pin of the current sensor U1 serves as a detection current input terminal, the 5 th pin serves as a detection current output terminal, the current sensor U1 is equivalent to a 100U Ω resistor connected in series on the output current line of the switching power supply, which has a small influence on the output current voltage of the switching power supply, the 3 rd pin serves as a detection signal output terminal of the switching power supply output current detection module 1 and is connected to the processor 6, and the 3 rd pin outputs a voltage proportional to the input current of the current sensor U1, so that the output current of the switching power supply can be detected conveniently.
As described above, in a specific implementation, the switching power supply output voltage detection module 2 includes the resistor R1, the resistor R2, and the operational amplifier U3A with the model MCP6022, one end of the resistor R1 is used as a voltage input positive connection terminal of the switching power supply output voltage detection module 2 and is connected to a voltage output positive connection terminal of the switching power supply, the other end of the resistor R1 is connected to one end of the resistor R2 and a non-inverting input terminal of the operational amplifier U3A, the other end of the resistor R2 is used as a voltage input negative connection terminal of the switching power supply output voltage detection module 2 and is connected to a voltage output negative connection terminal of the switching power supply, and an inverting input terminal of the operational amplifier U3A is connected to an operational amplifier output terminal and then is used as a detection signal output terminal of the switching power supply output voltage detection module 2 and is connected to.
As described above, the resistor R1 and the resistor R2 in the switching power supply output voltage detection module 2 in the present application constitute a resistor voltage divider circuit, so that the output voltage of the switching power supply is proportional to the voltage at the non-inverting input terminal of the operational amplifier U3A, and then signal amplification is performed through the operational amplifier U3A, which is beneficial to measuring small mV-level signals in the output voltage and finally outputting the small mV-level signals to the processor 6, so as to detect the output voltage and ripple variation of the switching power supply, and by detecting the ripple variation, the working state of an electrolytic capacitor connected to the output terminal of the switching power supply can be indirectly known, whether the capacitor performance is reduced or not, and an early diagnosis effect is achieved.
As described above, in specific implementation, the temperature detection module 3 includes an operational amplifier U3B with a model of MCP6022, a thermistor RT, and a resistor R3, one end of the resistor R3 is connected to +5V, the other end of the resistor R3 is connected to one end of the thermistor RT and a non-inverting input end of the operational amplifier U3B, the other end of the thermistor RT is grounded, and an inverting input end of the operational amplifier U3B is connected to an operational amplifier output end and then connected to the processor 6 as a detection signal output end of the temperature detection module 3.
As described above, the resistance of the thermistor RT changes with the temperature, so as to affect the voltage of the non-inverting input terminal of the operational amplifier U3B and the voltage of the operational amplifier output terminal, and thus, the ambient temperature can be known by detecting the voltage of the operational amplifier output terminal.
As described above, in practical implementation, the PWM wave pulse width detection module 4 includes the resistor R4, the resistor R5, and the optocoupler U4 with a model number of 4N25, one end of the resistor R5 is used as the voltage input positive connection end of the PWM wave pulse width detection module 4 and is connected with the PWM control pulse output end for controlling the on-off of the switch tube in the switch power supply, the other end of the resistor R5 is connected with the anode of a light emitting diode in the optocoupler U4, the cathode of the light emitting diode in the optocoupler U4 is used as the voltage input cathode connection end of the PWM wave pulse width detection module 4 and is connected with the input public end of a switching power supply, a collector electrode of a receiving tube in the optocoupler U4 is connected with one end of the resistor R4 and then is connected with the processor 6 as a detection signal output end of the PWM wave pulse width detection module 4, the other end of the resistor R4 is connected with 3.3V voltage, and the emitter of a receiving tube in the optical coupler U4 is grounded.
As described above, the PWM wave pulse width detection module 4 performs isolation detection by using the optocoupler U4, and the PWM control pulse for controlling the on/off of the switching tube in the switching power supply affects the on/off of the light emitting diode in the optocoupler U4, thereby affecting whether the collector and the emitter of the receiver tube in the optocoupler U4 are connected, that is, affecting whether the collector is grounded or pulled up to 3.3V, and then outputting a signal to the processor 6, so as to calculate the pulse width of the PWM control pulse, and know the frequency and duty ratio of the PWM control pulse.
As described above, in specific implementation, the switching tube current detection module 5 employs the current sensor U2 with the chip model of ACS758, the 4 th pin of the current sensor U2 serves as a detection current input terminal, the 5 th pin serves as a detection current output terminal, the current sensor U2 is equivalent to a 100U Ω resistor connected in series on a current circuit where the switching tube is located, the 3 rd pin serves as a detection signal output terminal of the switching tube current detection module 5 and is connected to the processor 6, and the 3 rd pin outputs a voltage proportional to the input current of the current sensor U2, so that the current flowing through the switching tube can be detected conveniently.
As described above, in specific implementation, the processor 6 uses an MCU of model STM32G 031.
As described above, the present disclosure is directed to a circuit for monitoring an operating state of a switching power supply, and all technical solutions having the same or similar structure as the present disclosure should be considered to fall within the protection scope of the present disclosure.
Claims (7)
1. A circuit for monitoring the working state of a switching power supply is characterized by comprising a switching power supply output current detection module (1), a switching power supply output voltage detection module (2), a temperature detection module (3) for detecting the ambient temperature, a PWM (pulse width modulation) wave pulse width detection module (4) for detecting the pulse width of a PWM wave for controlling the on-off of a switching tube in the switching power supply, a switching tube current detection module (5) for detecting the magnitude of current flowing through the switching tube in the switching power supply and a processor (6) for processing detection data, wherein the switching power supply output current detection module (1) detects a signal output end, the switching power supply output voltage detection module (2) detects a signal output end, the temperature detection module (3) detects a signal output end, the PWM wave pulse width detection module (4) detects a signal output end, And the detection signal output end of the switching tube current detection module (5) is respectively connected with the processor (6).
2. The circuit according to claim 1, wherein the switching power supply output current detection module (1) employs a current sensor U1 with a chip model ACS758, the 4 th pin of the current sensor U1 is used as a detection current input terminal, the 5 th pin is used as a detection current output terminal, and the 3 rd pin is used as a detection signal output terminal of the switching power supply output current detection module (1) and connected to the processor (6).
3. A circuit for monitoring the operating state of a switching power supply according to claim 1, characterized in that the switching power supply output voltage detection module (2) comprises a resistor R1, a resistor R2, and an operational amplifier U3A of MCP6022 type, one end of the resistor R1 is used as the voltage input positive connecting end of the switching power supply output voltage detection module (2) and is connected with the voltage output positive connecting end of the switching power supply, the other end of the resistor R1 is connected with one end of the resistor R2 and the non-inverting input end of the operational amplifier U3A, the other end of the resistor R2 is used as the voltage input negative electrode connecting end of the switch power supply output voltage detection module (2) and is connected with the voltage output negative electrode connecting end of the switch power supply, and the inverting input end of the operational amplifier U3A is connected with the operational amplifier output end and then is used as the detection signal output end of the switching power supply output voltage detection module (2) to be connected with the processor (6).
4. The circuit for monitoring the operating condition of a switching power supply according to claim 1, wherein the temperature detection module (3) comprises an operational amplifier U3B with the model number MCP6022, a thermistor RT and a resistor R3, one end of the resistor R3 is connected to +5V, the other end of the resistor R3 is connected to one end of the thermistor RT and the non-inverting input end of the operational amplifier U3B, the other end of the thermistor RT is grounded, and the inverting input end of the operational amplifier U3B is connected to the operational amplifier output end and then is connected to the processor (6) as the detection signal output end of the temperature detection module (3).
5. The circuit for monitoring the operating status of a switching power supply according to claim 1, wherein the PWM wave pulse width detection module (4) comprises a resistor R4, a resistor R5, and an optocoupler U4 with a model number of 4N25, one end of the resistor R5 is used as a positive voltage input connection terminal of the PWM wave pulse width detection module (4) for connecting to a PWM control pulse output terminal of a switching power supply for controlling the on/off of a switching tube, the other end of the resistor R5 is connected to a positive electrode of a light emitting diode in the optocoupler U4, a negative electrode of the light emitting diode in the optocoupler U4 is used as a negative voltage input connection terminal of the PWM wave pulse width detection module (4) for connecting to a common switching power supply input terminal, a collector of a receiving tube in the optocoupler U4 is connected to one end of the resistor R4 and then is used as a detection signal output terminal of the PWM wave pulse width detection module (4) for connecting to the processor (6), the other end of the resistor R4 is connected with 3.3V voltage, and the emitter of a receiving tube in the optical coupler U4 is grounded.
6. The circuit for monitoring the operating status of a switching power supply according to claim 1, wherein the switching tube current detection module (5) employs a current sensor U2 with a chip model ACS758, the 4 th pin of the current sensor U2 is used as a detection current input terminal, the 5 th pin is used as a detection current output terminal, and the 3 rd pin is used as a detection signal output terminal of the switching tube current detection module (5) and connected to the processor (6).
7. A circuit for monitoring the operating state of a switching power supply according to any one of claims 1-6, characterized in that the processor (6) is an MCU of the type STM32G 031.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020222340.XU CN212008876U (en) | 2020-02-27 | 2020-02-27 | Circuit for monitoring working state of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020222340.XU CN212008876U (en) | 2020-02-27 | 2020-02-27 | Circuit for monitoring working state of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212008876U true CN212008876U (en) | 2020-11-24 |
Family
ID=73423648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020222340.XU Active CN212008876U (en) | 2020-02-27 | 2020-02-27 | Circuit for monitoring working state of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212008876U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608097A (en) * | 2021-08-03 | 2021-11-05 | 深圳市时代速信科技有限公司 | Device performance detection device and system |
| CN113866662A (en) * | 2021-09-26 | 2021-12-31 | 石家庄通合电子科技股份有限公司 | Switching power supply output current detection circuit and switching power supply |
-
2020
- 2020-02-27 CN CN202020222340.XU patent/CN212008876U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608097A (en) * | 2021-08-03 | 2021-11-05 | 深圳市时代速信科技有限公司 | Device performance detection device and system |
| CN113866662A (en) * | 2021-09-26 | 2021-12-31 | 石家庄通合电子科技股份有限公司 | Switching power supply output current detection circuit and switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212008876U (en) | Circuit for monitoring working state of switching power supply | |
| CN203365558U (en) | Circuit and device for three-phase power open-phase detection | |
| CN105510833A (en) | Storage battery health status detection method, device and system | |
| CN203519712U (en) | Battery voltage acquisition system | |
| CN104181370A (en) | Load current detection circuit and detection device | |
| CN108107301B (en) | Optocoupler testing device | |
| CN201532552U (en) | Miniature measuring and controlling device for water purification machine | |
| CN211018245U (en) | Current monitoring circuit based on CP L D | |
| CN209821274U (en) | Optical coupler detection current circuit | |
| CN203365525U (en) | Power grid voltage detection device | |
| CN208226298U (en) | A kind of power supply unit and constant-current source of semiconductor laser | |
| CN209541918U (en) | A kind of contactless temperature-measuring sensor | |
| CN207923238U (en) | A kind of liquid level detection device of automobile cooling | |
| CN201335856Y (en) | Voltage-current converting circuit | |
| CN104459286A (en) | Battery voltage acquisition system | |
| CN101697564B (en) | Circuit structure capable of realizing critical failure signal generation function on network communication terminal equipment | |
| CN216670114U (en) | Insulation resistance tester | |
| CN217820764U (en) | Alternating current disturbance circuit for hydrogen fuel cell impedance online measurement | |
| CN219799570U (en) | Portable power supply for photoelectric switch sensor test | |
| CN210742487U (en) | Pulse photoelectric conversion device for electric energy meter electric fast transient pulse group | |
| CN118100099A (en) | Over-current protection method and circuit for positive bus of frequency converter | |
| CN210348247U (en) | Circuit control structure of MOSFET intermittent service life test system with junction temperature monitoring function | |
| CN218601372U (en) | Power consumption detection circuit and electronic equipment | |
| CN220709309U (en) | Switch detection circuit and device | |
| CN220671533U (en) | DC current voltage detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Maodian Town, Ganxian District, Ganzhou City, Jiangxi Province Patentee after: Huaneng Qinmei Ruijin Power Generation Co., Ltd Address before: Maodian Town, Ganxian County, Ganzhou City, Jiangxi Province Patentee before: HUANENG RUIJIN POWER GENERATION Co.,Ltd. |
|
| CP03 | Change of name, title or address |