CN218997685U - Inverter input overvoltage protection circuit - Google Patents
Inverter input overvoltage protection circuit Download PDFInfo
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- CN218997685U CN218997685U CN202223221443.2U CN202223221443U CN218997685U CN 218997685 U CN218997685 U CN 218997685U CN 202223221443 U CN202223221443 U CN 202223221443U CN 218997685 U CN218997685 U CN 218997685U
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Abstract
The application provides an inverter input overvoltage protection circuit, which comprises a power supply module, a voltage detection module, a relay driving module and a relay module; the power supply module is used for acquiring a power supply input signal; the voltage detection module is used for detecting the level of the power input signal so as to output a high level signal or a low level signal; the relay driving module is used for outputting a relay control signal when the power input signal is a high-level signal; the relay module is connected with the relay driving module and the power module and is used for generating a power control signal based on the relay control signal and realizing the disconnection and connection of the power supply and the inverter based on the power control signal. The inverter overvoltage protection circuit can independently detect the input voltage of the inverter and can independently and timely close the input power supply of the inverter; the damage of the inverter caused by the unstable input power supply or the like or the erroneous connection of the over-high voltage power supply can be timely and effectively avoided; the safety and the reliability of the electric equipment are ensured.
Description
Technical Field
The application belongs to the technical field of overvoltage protection, relates to an input voltage protection circuit, and particularly relates to an input overvoltage protection circuit of an inverter.
Background
An inverter is a device that converts direct current into alternating current. In the actual use process, if the inverter is connected with a high-voltage power supply by mistake or the input power supply is unstable, the operation of the inverter is unstable, the service life of an electric load is reduced, and even the electric equipment can be damaged, so that the inverter needs to design a corresponding input voltage protection circuit in order to ensure the safe and reliable operation of the electric equipment. In the current prior art implementation methods, it is common to provide an input voltage sampling circuit for an inverter. Although the input overvoltage signal of the inverter can be acquired by the microcontroller (Micro Controller Unit, MCU), the MCU controls the turn-off of the power-on relay and simultaneously leads to the power cut-off of the MCU, so that the safety of the bus capacitor of the inverter cannot be timely and effectively protected.
Disclosure of Invention
An object of the present application is to provide an inverter input voltage protection circuit, which is used for solving the technical problems that in the prior art, the inverter input voltage cannot be independently detected and the inverter input power cannot be independently turned off.
The application provides an inverter input overvoltage protection circuit, which comprises a power supply module, a voltage detection module, a relay driving module and a relay module; the power supply module is used for acquiring a power supply input signal; the voltage detection module is connected with the power supply module and is used for detecting the level of the power supply input signal so as to output a high-level signal or a low-level signal; the relay driving module is connected with the voltage detection module and is used for outputting a relay control signal when the power input signal is the high-level signal; the relay module is connected with the relay driving module and the power module, and is used for generating a power control signal based on the relay control signal and realizing the disconnection and connection of a power supply and an inverter based on the power control signal.
In an embodiment of the present application, the power module includes a linear transformer for sampling the ac signal in equal proportion to obtain the power input signal.
In an embodiment of the present application, the voltage detection module includes a comparator, configured to compare the power input signal with a preset value, and output the high level signal in an overvoltage mode or output the low level signal in a non-overvoltage mode.
In an embodiment of the present application, the relay module includes a first relay and a second relay; the first relay is a normally closed relay; the second relay module is a normally open relay, and the second relay is connected with the first relay in parallel.
In an embodiment of the present application, the relay driving module includes a first relay driving unit and a second relay driving unit;
the first relay driving unit is used for generating a first relay control signal based on the high-level signal or the low-level signal so as to control the on and off of the first relay;
the second relay driving unit is used for generating a second relay control signal based on the high-level signal so as to control the on and off of the second relay.
In an embodiment of the present application, the first relay driving unit includes a PNP triode and a photocoupler;
the base electrode of the PNP triode is connected with the output end of the voltage detection module, and the collector electrode is grounded;
the photoelectric coupler comprises a luminous tube and a light receiving tube, one end of the luminous tube is connected with the emitter of the PNP triode, and the other end of the luminous tube is connected with the relay module; the light receiving tube is used for generating photocurrent after the luminous tube emits light.
In an embodiment of the present application, the second relay driving unit and the first relay driving unit are coupled and connected through a photoelectric coupler.
In an embodiment of the present application, the second relay driving unit includes an MCU, one end of the MCU is connected to a light receiving tube of the photoelectric coupler, and is configured to input a photocurrent generated by the light receiving tube, and generate an overvoltage signal based on the photocurrent; the other end is connected with a relay module and is used for outputting the second relay control signal generated based on the overvoltage signal.
In an embodiment of the present application, the power control signal is used to control the power to precharge the bus capacitor of the inverter through the first relay when the power is initially powered on.
In an embodiment of the present application, the power control signal is used to control the power supply to supply power to the inverter through the second relay after the precharge is completed and in a non-overvoltage mode.
As described above, the inverter input voltage protection circuit described in the present application has the following beneficial effects:
(1) The input voltage of the inverter can be independently detected, and the input power supply of the inverter can be independently and timely turned off;
(2) The inverter damage caused by the reason of misconnection of an over-high voltage power supply or unstable input power supply can be timely and effectively avoided;
(3) The safety and the reliability of the electric equipment are ensured.
Drawings
Fig. 1 is a schematic diagram of an inverter input voltage protection circuit according to an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of an inverter input voltage protection circuit according to an embodiment of the present application.
Description of element reference numerals
1. Power supply module
2. Voltage detection module
3. Relay driving module
31 MCU module
4. Relay module
5. Inverter with a power supply
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that, the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
In addition, descriptions such as those related to "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in this application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
The following embodiments of the present application provide an inverter input voltage protection circuit, which solves the technical problem that the prior art cannot independently detect the input voltage of an inverter and cannot independently turn off the input power of the inverter.
The principle and implementation of an inverter input voltage protection circuit according to the present embodiment will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the inverter input voltage protection circuit according to the present embodiment without creative effort.
As shown in fig. 1, the present embodiment provides an inverter overvoltage protection circuit, which includes a power module 1, a voltage detection module 2, a relay driving module 3, and a relay module 4.
In one embodiment, the power module 1 is configured to obtain a power input signal.
Specifically, as shown in fig. 2, the power module 1 includes a linear transformer T1, a diode D1, a capacitor E2, a capacitor E3, and a regulator ZD1. The input voltage of the linear transformer T1 is in direct proportion to the number of turns of the primary coil, the output voltage is in direct proportion to the number of turns of the secondary coil, the primary alternating current circuit generates magnetic flux after the primary coil generates magnetic flux, the secondary coil senses in a coupling mode, and the linear transformer T1 can be used for sampling alternating current signals in equal proportion to obtain the power input signal. The power input SIGNAL in this embodiment of the present application is the output OV-SIGNAL of the linear transformer T1.
In one embodiment, the voltage detection module 2 is connected to the power module 1, and is configured to detect a level of the power input signal to output a high level signal or a low level signal.
The voltage detection module 2 comprises resistors R4, R5, R7, R8, R9, R10 and a comparator U1A. The comparator U1A is used for comparing the power input signal with a preset value and outputting a high-level signal in an overvoltage mode or outputting a low-level signal in a non-overvoltage mode.
Specifically, the positive input end of the comparator U1A is connected to the power input SIGNAL OV-SIGNAL, the negative input end is connected to the preset value V-REF, and when the voltage of the positive input end OV-SIGNAL is higher than that of the negative input end V-REF, the output end of the U1A outputs a high level 1 under the action of an MOS tube (not shown) inside the U1A; similarly, when the voltage of the positive input end OV-SIGNAL is lower than the voltage of the negative input end V-REF, the U1A outputs a low level 0 under the action of the MOS transistor inside the U1A.
In an embodiment, the relay driving module 3 includes resistors R1, R2, R3, R6, a capacitor C1, a PNP transistor Q1, and an optocoupler PC1. The relay driving module 3 is connected with the voltage detecting module 2 and is used for outputting a relay control signal when the power input signal is at the high level.
In one embodiment, the relay module 4 includes a resistor R11, a first relay RY1, and a second relay RY2; the first relay RY1 is a normally closed relay, and when the RY1 is in a non-energized state, a contact thereon is in a closed state, and the first relay can be possibly changed to an open state only after the RY1 is energized. The second relay module RY2 is a normally open relay, and contacts thereon are in an open state when the RY2 is in a non-energized state, and only after the RY2 is energized, the second relay module RY may be in a closed state. The second relay RY2 and the first relay RY1 are connected in parallel, and play roles in automatic adjustment, safety protection, circuit switching and the like in a circuit.
In an embodiment, the relay driving module 3 includes a first relay driving unit and a second relay driving unit;
the first relay driving unit is used for generating a first relay control signal based on the high-level signal or the low-level signal so as to control the on and off of the first relay.
Specifically, the first relay driving unit includes a PNP triode Q1 and a photo coupler PC1; the base electrode of the PNP triode is connected with the voltage detection module, particularly connected with the output end of the comparator U1A, and the collector electrode is grounded; the photoelectric coupler PC1 comprises a luminous tube and a light receiving tube, one end of the luminous tube is connected with the emitter of the PNP triode Q1, and the other end of the luminous tube is connected with the first relay RY1 in the relay module; the light receiving pipe is used for generating photocurrent after the light emitting tube of the photoelectric coupler emits light.
The second relay driving unit is used for generating a second relay control signal based on the high-level signal so as to control the on and off of the second relay.
Specifically, the second relay driving unit and the first relay driving unit are coupled and connected through the photocoupler PC1. The second relay driving unit comprises an MCU module 31, one end of the MCU is connected with a light receiving pipe of the photoelectric coupler and is used for inputting photocurrent generated by the light receiving pipe and generating an overvoltage signal based on the photocurrent; the other end is connected to a relay module, in particular to the second relay RY2, for outputting the second relay control signal generated on the basis of the overvoltage signal.
In an embodiment, the relay module 4 is connected to the relay driving module 3 and the power module 1, and is configured to generate a power control signal based on the relay control signal, and implement the power supply and the inverter 5 to be disconnected and connected based on the power control signal.
Specifically, the power supply control signal is used for controlling the power supply to precharge the bus capacitor of the inverter through the first relay when the power supply is initially electrified. The power supply control signal is used for controlling the power supply to supply power to the inverter through the second relay after the pre-charging is completed and in a non-overvoltage mode.
The inverter 5 comprises a rectifier bridge pile, a bus capacitor and three (Insulated Gate Bipolar Transistor, IGBT) pair tubes, and is used for converting an input alternating current signal into direct current voltage through the rectifier bridge pile and the bus capacitor, and converting the direct current voltage into alternating current voltage through an inverter bridge formed by the three IGBT pair tubes so as to drive the motor to operate.
The whole use process of the overvoltage protection circuit of the inverter is as follows:
at the initial power-up, the first relay RY1 is in a closed state, the alternating current signal charges the bus capacitor of the inverter through R11, and the first relay RY1 performs a precharge function on the inverter.
After the bus capacitor of the inverter is charged, and when no overvoltage signal appears in the alternating current signal, the MCU controls the second relay RY2 to be closed, and the working current of the inverter and the rear-stage motor is directly provided through the RY 2. Because no resistance exists between the alternating current signal and RY2, the generated large current is used for ensuring the normal operation of the inverter-driven rear-stage motor.
The power input SIGNAL OV-SIGNAL output from the linear transformer will be greater than the set voltage value V-REF once the ac SIGNAL in the circuit develops an overvoltage SIGNAL. For example, the set voltage value is 220V, the power input signal is 360V, the output end of the comparator can output a low-level signal under the action of an internal MOS tube of the comparator, the low-level signal can drive the PNP triode Q1 to switch from an off state to an on state, the first relay RY1 changes from the on state to the off state, meanwhile, an overvoltage signal is output to the MCU in the voltage detection module, then the MCU controls the end of the mcu_ry2 of the RY2 to be low, so that the second relay RY2 changes from the on state to the off state, and at the moment, the whole inverter and the alternating current signal are disconnected, thereby timely and effectively avoiding the excessive voltage from entering the inverter. When the inverter is in the condition of no input power supply, the bus capacitor starts to discharge outwards, the voltage at two ends of the bus capacitor gradually drops until the power supply input SIGNAL in the circuit is recovered to a normal value, namely, the power supply input SIGNAL OV-SIGNAL output from the linear transformer is smaller than the set voltage value V-REF, the comparator outputs a high-level SIGNAL, the first relay RY1 is changed from an open state to a closed state, and the inverter reenters the precharge process. The voltage detection module and the inverter in the embodiment of the application are completely isolated, the inverter cannot influence the operation of the voltage detection circuit, the voltage detection circuit can transmit an overvoltage signal to the MCU, the MCU controls the turn-off of the first relay and the second relay in the relay module, the power input of the inverter is timely cut off, and accordingly the burning of the bus capacitor of the inverter due to overvoltage is avoided.
The descriptions of the processes or structures corresponding to the drawings have emphasis, and the descriptions of other processes or structures may be referred to for the parts of a certain process or structure that are not described in detail.
In summary, the inverter overvoltage protection circuit solves the technical problems that the inverter input voltage cannot be independently detected and the inverter input power supply cannot be independently turned off in the prior art, and can independently detect the inverter input voltage and independently turn off the inverter input power supply in time; the inverter damage caused by the reason of misconnection of an over-high voltage power supply or unstable input power supply can be timely and effectively avoided; the safety and the reliability of the electric equipment are ensured.
The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application.
Claims (10)
1. An inverter input overvoltage protection circuit is characterized by comprising a power supply module, a voltage detection module, a relay driving module and a relay module;
the power supply module is used for acquiring a power supply input signal;
the voltage detection module is connected with the power supply module and is used for detecting the level of the power supply input signal so as to output a high-level signal or a low-level signal;
the relay driving module is connected with the voltage detection module and is used for outputting a relay control signal when the power input signal is the high-level signal;
the relay module is connected with the relay driving module and the power module, and is used for generating a power control signal based on the relay control signal and realizing the disconnection and connection of a power supply and an inverter based on the power control signal.
2. The inverter input overvoltage protection circuit of claim 1, wherein the power module includes a linear transformer for equally sampling an ac electrical signal to obtain the power input signal.
3. The inverter input overvoltage protection circuit of claim 1, wherein the voltage detection module includes a comparator for comparing the power input signal with a preset value and outputting the high level signal in an overvoltage mode or the low level signal in a non-overvoltage mode.
4. The inverter input overvoltage protection circuit of claim 1, wherein the relay module comprises a first relay and a second relay; the first relay is a normally closed relay; the second relay module is a normally open relay, and the second relay is connected with the first relay in parallel.
5. The inverter input overvoltage protection circuit of claim 1, wherein the relay drive module comprises a first relay drive unit and a second relay drive unit;
the first relay driving unit is used for generating a first relay control signal based on the high-level signal or the low-level signal so as to control the on and off of the first relay;
the second relay driving unit is used for generating a second relay control signal based on the high-level signal so as to control the on and off of the second relay.
6. The inverter input overvoltage protection circuit of claim 5, wherein the first relay drive unit comprises a PNP transistor and a photo coupler;
the base electrode of the PNP triode is connected with the output end of the voltage detection module, and the collector electrode is grounded;
the photoelectric coupler comprises a luminous tube and a light receiving tube, one end of the luminous tube is connected with the emitter of the PNP triode, and the other end of the luminous tube is connected with the relay module; the light receiving tube is used for generating photocurrent after the luminous tube emits light.
7. The inverter input overvoltage protection circuit of claim 5, wherein the second relay drive unit and the first relay drive unit are coupled via a photo coupler.
8. The inverter input overvoltage protection circuit according to claim 7, wherein the second relay driving unit comprises an MCU, one end of which is connected to a light receiving tube of the photocoupler, for inputting a photocurrent generated by the light receiving tube and generating an overvoltage signal based on the photocurrent; the other end is connected with the relay module and is used for outputting a second relay control signal generated based on the overvoltage signal.
9. The inverter input overvoltage protection circuit of claim 1, wherein the power control signal is used to control the power supply to precharge the bus capacitance of the inverter via the first relay upon initial power up.
10. The inverter input overvoltage protection circuit of claim 1, wherein the power control signal is used to control the power supply to power the inverter through the second relay after the precharge is completed and in a non-overvoltage mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223221443.2U CN218997685U (en) | 2022-12-01 | 2022-12-01 | Inverter input overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223221443.2U CN218997685U (en) | 2022-12-01 | 2022-12-01 | Inverter input overvoltage protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218997685U true CN218997685U (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223221443.2U Active CN218997685U (en) | 2022-12-01 | 2022-12-01 | Inverter input overvoltage protection circuit |
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| CN (1) | CN218997685U (en) |
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- 2022-12-01 CN CN202223221443.2U patent/CN218997685U/en active Active
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