CN220605766U - Frequency converter control circuit - Google Patents
Frequency converter control circuit Download PDFInfo
- Publication number
- CN220605766U CN220605766U CN202322244067.7U CN202322244067U CN220605766U CN 220605766 U CN220605766 U CN 220605766U CN 202322244067 U CN202322244067 U CN 202322244067U CN 220605766 U CN220605766 U CN 220605766U
- Authority
- CN
- China
- Prior art keywords
- electric energy
- module
- resistor
- power supply
- power
- 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
- 238000004146 energy storage Methods 0.000 claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 33
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims 4
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 2
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses a control circuit of a frequency converter, which relates to the technical field of protection and control of frequency converters, and comprises an electric energy detection module and a power supply detection module which are respectively used for detecting whether a power supply module falls or not and whether the power supply module is overvoltage or not; the frequency conversion module is used for inversion and frequency conversion regulation and is output by the output module; the electric energy control module is used for carrying out voltage division and electric energy absorption and carrying out overvoltage power-off protection on the electric energy after voltage division; and the overvoltage judging module is used for judging whether the electric energy control module is full of electricity and controlling the energy storage control module to store electric energy. The frequency converter control circuit detects whether the electric energy provided by the power supply module is over-voltage or not and fails, if the electric energy is over-voltage, the electric energy control module performs voltage division processing, if the electric energy after the voltage division is still in an over-voltage state, the power supply is directly disconnected, if the electric energy is fallen, the input braking electric energy is absorbed, and if the stored electric energy exceeds a voltage threshold set by the over-voltage judging module, the energy storage control module is controlled to be connected to store the electric energy.
Description
Technical Field
The utility model relates to the technical field of protection control of frequency converters, in particular to a control circuit of a frequency converter.
Background
The utility model provides an applied frequency conversion technique and microelectronics, the power control equipment of alternating current motor is controlled through changing motor working power frequency mode, current converter is for the security that improves work, the fault protection circuit is mostly adopted to the work of converter to appear supplying power trouble and carry out the outage protection, and the braking electric energy that produces when adopting the electric energy absorption circuit to the converter braking is absorbed, avoid the converter to receive the damage, but because fault protection circuit and electric energy absorption circuit are two independent circuit structures, lead to becoming complicated to the control circuit structure of converter, and increase circuit volume and cost, therefore need to improve.
Disclosure of Invention
The embodiment of the utility model provides a frequency converter control circuit to solve the problems in the background art.
According to an embodiment of the present utility model, there is provided a frequency converter control circuit including: the device comprises a power supply module, an electric energy detection module, a power supply detection module, a frequency conversion module, an output module, an electric energy control module, an overvoltage judgment module and an energy storage control module;
the power supply module is used for providing three-phase electric energy, carrying out three-phase rectification treatment on the three-phase electric energy and outputting direct-current electric energy;
the power detection module is connected with the power module and used for isolating and detecting the power state of the three-phase power provided by the power module and outputting a first control signal when power is lost;
the power supply detection module is connected with the power supply module and is used for judging overvoltage of the direct-current electric energy output by the power supply module and outputting a second control signal when the direct-current electric energy is overvoltage;
the frequency conversion module is connected with the power supply module and is used for carrying out inversion and frequency conversion adjustment treatment on the electric energy output by the power supply module and outputting alternating current electric energy;
the output module is connected with the frequency conversion module and is used for being connected with motor equipment and receiving electric energy output by the frequency conversion module;
the electric energy control module is connected with the power supply detection module, the electric energy detection module, the power supply module and the frequency conversion module, and is used for receiving the first control signal and the second control signal and triggering the work of the electric energy control circuit, carrying out partial pressure processing and electric energy storage on the direct current electric energy output by the power supply module and the braking electric energy generated by the frequency conversion module through the electric energy control circuit, and carrying out overvoltage judgment processing on the electric energy after partial pressure and carrying out power-off protection during overvoltage;
the overvoltage judging module is connected with the electric energy control module and is used for judging whether the electric energy stored by the electric energy control module exceeds a set voltage threshold value and outputting a third control signal when the electric energy exceeds the set voltage threshold value;
the energy storage control module is connected with the electric energy control module and the overvoltage judging module and is used for controlling the energy storage control circuit to store the electric energy divided by the electric energy control module through the third control signal.
Compared with the prior art, the utility model has the beneficial effects that: the frequency converter control circuit is characterized in that a power supply detection module detects whether the electric energy provided by a power supply module is over-voltage, the electric energy detection module detects whether the power supply module fails, if the overvoltage occurs, the input electric energy is subjected to voltage division processing through an electric energy control module, if the divided electric energy is still in an over-voltage state, the power supply is directly disconnected, if the power supply fails, the input braking electric energy is absorbed through the electric energy control module, if the electric energy stored by the electric energy control module exceeds a voltage threshold set by an overvoltage judging module, the energy storage control module is controlled to be connected to store the electric energy, the overvoltage protection and the absorption of the circuit are realized, the safety of the circuit is improved, the protection and the absorption are integrated, the circuit volume is reduced, and the circuit structure is simple and easy to implement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a control circuit of a frequency converter according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of a control circuit of a frequency converter according to an embodiment of the present utility model.
Fig. 3 is a connection circuit diagram of a power supply detection module according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In one embodiment, referring to fig. 1, a frequency converter control circuit includes: the device comprises a power supply module 1, an electric energy detection module 2, a power supply detection module 3, a frequency conversion module 4, an output module 5, an electric energy control module 6, an overvoltage judgment module 7 and an energy storage control module 8;
specifically, the power module 1 is configured to provide three-phase electric energy and perform three-phase rectification processing on the three-phase electric energy, and is configured to output direct current electric energy;
the power detection module 2 is connected with the power module 1 and is used for isolating and detecting the power state of three-phase power provided by the power module 1 and outputting a first control signal when power is lost;
the power supply detection module 3 is connected with the power supply module 1 and is used for judging overvoltage of the direct-current electric energy output by the power supply module 1 and outputting a second control signal when the direct-current electric energy is overvoltage;
the frequency conversion module 4 is connected with the power supply module 1 and is used for carrying out inversion and frequency conversion adjustment treatment on the electric energy output by the power supply module 1 and outputting alternating current electric energy;
the output module 5 is connected with the frequency conversion module 4 and is used for being connected with motor equipment and receiving electric energy output by the frequency conversion module 4;
the electric energy control module 6 is connected with the power supply detection module 3, the electric energy detection module 2, the power supply module 1 and the frequency conversion module 4, and is used for receiving the first control signal and the second control signal and triggering the work of the electric energy control circuit, and is used for carrying out partial pressure treatment and electric energy storage on the direct current electric energy output by the power supply module 1 and the braking electric energy generated by the frequency conversion module 4 through the electric energy control circuit, and carrying out overvoltage judgment treatment on the partial pressure electric energy and carrying out power-off protection during overvoltage;
the overvoltage judging module 7 is connected with the electric energy control module 6 and is used for judging whether the electric energy stored by the electric energy control module 6 exceeds a set voltage threshold value and outputting a third control signal when the electric energy exceeds the set voltage threshold value;
and the energy storage control module 8 is connected with the electric energy control module 6 and the overvoltage judging module 7 and is used for controlling the energy storage control circuit to store the electric energy divided by the electric energy control module 6 through the third control signal.
In a specific embodiment, the power module 1 may use a power processing circuit to provide three-phase electric energy and perform three-phase rectification processing on the three-phase electric energy; the power detection module 2 can adopt an isolation power-down detection circuit to detect power down of the power supply module 1; the power supply detection module 3 can adopt an overvoltage judging circuit to judge whether the electric energy output by the power supply module 1 is overvoltage or not; the frequency conversion module 4 can adopt a frequency conversion circuit consisting of IGBT to realize the inversion and frequency conversion adjustment of electric energy and output three-phase alternating current electric energy; the output module 5 can adopt an output port to be connected with equipment such as a motor and the like; the electric energy control module 6 can adopt an electric energy control circuit consisting of a voltage division control circuit, an electric energy storage circuit and a power-off protection circuit, the voltage division control circuit is used for transmitting and dividing the electric energy output by the power supply module 1 and the electric energy output by the frequency conversion module 4, then the electric energy storage circuit is used for absorbing the electric energy, the power-off protection circuit is used for judging the overvoltage of the divided electric energy, and the power supply of the power supply module 1 is disconnected when the overvoltage occurs; the overvoltage judging module 7 can adopt a full power judging circuit to judge the full power of the electric energy stored by the electric energy control module 6 and control the energy storage control module 8 to work when the electric energy is full; the energy storage control module 8 may use an energy storage control circuit to store the divided electric energy.
In another embodiment, referring to fig. 1, 2 and 3, the power module 1 includes a three-phase power supply and a first rectifier J1; the frequency conversion module 4 comprises a first frequency converter J2 and a first capacitor C1; the output module 5 comprises an output port;
specifically, the first end, the second end and the third end of the power supply are respectively connected with the first input end, the second input end and the third input end of the first rectifier J1, the first output end of the first rectifier J1 is connected with the first end of the first capacitor C1 and the first input end of the first frequency converter J2, the second output end of the first rectifier J1 is connected with the electric energy control module 6, the second end of the first capacitor C1 and the second input end of the first frequency converter J2 are grounded, and the first output end, the second output end and the third output end of the first frequency converter J2 are respectively connected with the first end, the second end and the third end of the output port.
In a specific embodiment, the first rectifier J1 may be a three-phase rectifier device; the first frequency converter J2 may be composed of six IGBTs, and is controlled by the relevant controller for inversion and frequency conversion adjustment, which will not be described herein.
Further, the electric energy control module 6 includes a first power tube Q1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first energy storage capacitor CN1, a sixth resistor R6, a third diode D3, and a first control tube M1;
specifically, the collector of the first power tube Q1 is connected to the first output end of the first rectifier J1, the emitter of the first power tube Q1 is connected to the first end of the fourth resistor R4, the first end of the sixth resistor R6 and the first end of the first energy storage capacitor CN1 through the third resistor R3, the second end of the fourth resistor R4 is connected to the cathode of the third diode D3 and is connected to the drain of the first control tube M1 and the second output end of the first rectifier J1 through the fifth resistor R5, the anode of the third diode D3 is connected to the gate of the first control tube M1, the source of the first control tube M1 is connected to the second end of the first energy storage capacitor CN1 and the second end of the first capacitor C1, and the second end of the sixth resistor R6 is connected to the energy storage control module 8.
In a specific embodiment, the first power tube Q1 may be an IGBT, and is matched with a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6 to form a voltage division control circuit; the third diode D3 and the first control tube M1 form a power-off protection circuit, where the first control tube M1 may be an N-channel enhancement MOS tube; the first energy storage capacitor CN1 may be a super capacitor, so as to form an electric energy storage circuit.
Further, the power detection module 2 includes a first resistor R1, a first diode D1, a first optocoupler U1, a first power VCC1, a second resistor R2, and a second diode D2;
specifically, the anode of the first diode D1 is connected to the first end of the three-phase power supply through a first resistor R1, the cathode of the first diode D1 is connected to the first end of the first optocoupler U1, the second end of the first optocoupler U1 is grounded, the third end of the first optocoupler U1 is connected to the anode of the second diode D2 and is connected to the first power supply VCC1 through a second resistor R2, the fourth end of the first optocoupler U1 is grounded, and the cathode of the second diode D2 is connected to the gate of the first power tube Q1.
In a specific embodiment, the first optocoupler U1 may be a PC817 optocoupler.
Further, the power supply detection module 3 includes a tenth resistor R10, an eleventh resistor R11, a second comparator A2, a second threshold device, a twelfth resistor R12, a first switching transistor VT1, a third power supply VCC3, a seventh resistor R7, and a fourth diode D4;
specifically, one end of the tenth resistor R10 is connected to the first output end of the first rectifier J1, the other end of the tenth resistor R10 is connected to the in-phase end of the second comparator A2 and is connected to the second output end of the first rectifier J1 through the eleventh resistor R11, the inverting end of the second comparator A2 is connected to the second threshold device, the output end of the second comparator A2 is connected to the base of the first switching tube VT1 through the twelfth resistor R12, the collector of the first switching tube VT1 is connected to the third power source VCC3, the emitter of the first switching tube VT1 is connected to the anode of the fourth diode D4 and is grounded through the seventh resistor R7, and the cathode of the fourth diode D4 is connected to the gate of the first power tube Q1.
In a specific embodiment, the eleventh resistor R11 and the eleventh resistor R11 are used for power sampling; the second comparator A2 can be an LM397 comparator, and the second threshold device provides an overvoltage threshold value to carry out overvoltage judgment; the first switching transistor VT1 may be an NPN transistor.
Further, the overvoltage judging module 7 includes a first comparator A1, a first threshold device, a ninth resistor R9, a second power source VCC2, a second switching tube VT2, and an eighth resistor R8;
specifically, the in-phase end of the first comparator A1 is connected to the first threshold device, the inverting end of the first comparator A1 is connected to the second end of the fourth resistor R4, the output end of the first comparator A1 is connected to the base of the second switching tube VT2 through the ninth resistor R9, the collector of the second switching tube VT2 is connected to the second power supply VCC2, and the emitter of the second switching tube VT2 is grounded through the eighth resistor R8.
In a specific embodiment, the first comparator A1 may be an LM397 comparator, and the first threshold device may provide a full power threshold for full power judgment; the second switching transistor VT2 may be an NPN transistor.
Further, the energy storage control module 8 includes a second power tube Q2, a second capacitor C2, a first voltage stabilizing tube VD1 and an energy storage device;
specifically, the collector of the second power tube Q2 is connected to the second end of the sixth resistor R6, the emitter of the second power tube Q2 is connected to one of the second capacitor C2, the cathode of the first voltage stabilizing tube VD1 and the first case of the energy storage device, the other end of the second capacitor C2, the anode of the first voltage stabilizing tube VD1 and the second end of the energy storage device are all grounded, and the gate of the second power tube Q2 is connected to the emitter of the second switching tube VT 2.
In a specific embodiment, the second power tube Q2 may be an IGBT, and is matched with the second capacitor C2, the first voltage stabilizing tube VD1, and an energy storage device to form an energy storage control circuit, where the energy storage device may be, but is not limited to, a lithium battery and a storage battery.
According to the frequency converter control circuit, three-phase electric energy provided by a three-phase power supply is rectified by the first rectifier J1, inversion and frequency conversion regulation processing are performed by the first frequency converter J2, the electric energy is transmitted by the output port, when the electric energy output by the first rectifier J1 is larger than an overvoltage threshold value provided by the second threshold value device, the second comparator A2 controls the first switching tube VT1 to be conducted, the first power tube Q1 is controlled to be conducted, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are enabled to conduct voltage division processing, the first energy storage capacitor CN1 is enabled to conduct electric energy absorption, the voltage input into the first frequency converter J2 is reduced, meanwhile, if the divided electric energy can break down the third diode D3, the first power tube Q1 is enabled to be cut off, the power supply module 1 is enabled to stop supplying power, if the first energy storage capacitor CN1 is full, the first comparator A1 is enabled to conduct the second switching tube VT2, the first power tube Q1 is enabled to conduct, the electric energy transmitted by the first power tube Q1 is enabled to be stored by the energy storage device, the three-phase electric energy is enabled to conduct voltage division processing with the first power tube Q1, the electric energy transmitted by the first energy storage device is enabled to conduct the first energy storage capacitor C1, the first energy storage capacitor C is enabled to conduct the electric energy storage device to trigger the first energy storage capacitor C1 to conduct the electric energy absorption through the first energy storage capacitor C, and the first energy storage capacitor C1 is enabled to further break the energy storage capacitor C1, and the first energy storage capacitor C has the energy storage capacitor C1 is enabled to conduct energy.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A control circuit of a frequency converter is characterized in that,
the frequency converter control circuit includes: the device comprises a power supply module, an electric energy detection module, a power supply detection module, a frequency conversion module, an output module, an electric energy control module, an overvoltage judgment module and an energy storage control module;
the power supply module is used for providing three-phase electric energy, carrying out three-phase rectification treatment on the three-phase electric energy and outputting direct-current electric energy;
the power detection module is connected with the power module and used for isolating and detecting the power state of the three-phase power provided by the power module and outputting a first control signal when power is lost;
the power supply detection module is connected with the power supply module and is used for judging overvoltage of the direct-current electric energy output by the power supply module and outputting a second control signal when the direct-current electric energy is overvoltage;
the frequency conversion module is connected with the power supply module and is used for carrying out inversion and frequency conversion adjustment treatment on the electric energy output by the power supply module and outputting alternating current electric energy;
the output module is connected with the frequency conversion module and is used for being connected with motor equipment and receiving electric energy output by the frequency conversion module;
the electric energy control module is connected with the power supply detection module, the electric energy detection module, the power supply module and the frequency conversion module, and is used for receiving the first control signal and the second control signal and triggering the work of the electric energy control circuit, carrying out partial pressure processing and electric energy storage on the direct current electric energy output by the power supply module and the braking electric energy generated by the frequency conversion module through the electric energy control circuit, and carrying out overvoltage judgment processing on the electric energy after partial pressure and carrying out power-off protection during overvoltage;
the overvoltage judging module is connected with the electric energy control module and is used for judging whether the electric energy stored by the electric energy control module exceeds a set voltage threshold value and outputting a third control signal when the electric energy exceeds the set voltage threshold value;
the energy storage control module is connected with the electric energy control module and the overvoltage judging module and is used for controlling the energy storage control circuit to store the electric energy divided by the electric energy control module through the third control signal.
2. A frequency converter control circuit according to claim 1, wherein the power supply module comprises a three-phase power supply and a first rectifier; the frequency conversion module comprises a first frequency converter and a first capacitor; the output module comprises an output port;
the first end, the second end and the third end of the power supply are respectively connected with the first input end, the second input end and the third input end of the first rectifier, the first output end of the first rectifier is connected with the first end of the first capacitor and the first input end of the first frequency converter, the second output end of the first rectifier is connected with the electric energy control module, the second end of the first capacitor and the second input end of the first frequency converter are grounded, and the first output end, the second output end and the third output end of the first frequency converter are respectively connected with the first end, the second end and the third end of the output port.
3. The frequency converter control circuit of claim 2, wherein the power control module comprises a first power tube, a third resistor, a fourth resistor, a fifth resistor, a first energy storage capacitor, a sixth resistor, a third diode, and a first control tube;
the collector of the first power tube is connected with the first output end of the first rectifier, the emitter of the first power tube is connected with the first end of the fourth resistor, the first end of the sixth resistor and the first end of the first energy storage capacitor through the third resistor, the second end of the fourth resistor is connected with the cathode of the third diode and connected with the drain electrode of the first control tube and the second output end of the first rectifier through the fifth resistor, the anode of the third diode is connected with the grid electrode of the first control tube, the source electrode of the first control tube is connected with the second end of the first energy storage capacitor and the second end of the first capacitor, and the second end of the sixth resistor is connected with the energy storage control module.
4. A frequency converter control circuit according to claim 3, wherein the power detection module comprises a first resistor, a first diode, a first optocoupler, a first power supply, a second resistor, and a second diode;
the anode of the first diode is connected with the first end of the three-phase power supply through a first resistor, the cathode of the first diode is connected with the first end of the first optical coupler, the second end of the first optical coupler is grounded, the third end of the first optical coupler is connected with the anode of the second diode and is connected with the first power supply through a second resistor, the fourth end of the first optical coupler is grounded, and the cathode of the second diode is connected with the grid electrode of the first power tube.
5. A frequency converter control circuit according to claim 3, wherein the power supply detection module comprises a tenth resistor, an eleventh resistor, a second comparator, a second threshold device, a twelfth resistor, a first switching tube, a third power supply, a seventh resistor, and a fourth diode;
one end of the tenth resistor is connected with the first output end of the first rectifier, the other end of the tenth resistor is connected with the same-phase end of the second comparator and is connected with the second output end of the first rectifier through the eleventh resistor, the opposite-phase end of the second comparator is connected with the second threshold device, the output end of the second comparator is connected with the base electrode of the first switching tube through the twelfth resistor, the collector electrode of the first switching tube is connected with the third power supply, the emitter electrode of the first switching tube is connected with the anode electrode of the fourth diode and is grounded through the seventh resistor, and the cathode electrode of the fourth diode is connected with the grid electrode of the first power tube.
6. A frequency converter control circuit according to claim 3, wherein the overvoltage judging module comprises a first comparator, a first threshold device, a ninth resistor, a second power supply, a second switching tube and an eighth resistor;
the non-inverting terminal of the first comparator is connected with the first threshold device, the inverting terminal of the first comparator is connected with the second terminal of the fourth resistor, the output terminal of the first comparator is connected with the base electrode of the second switching tube through the ninth resistor, the collector electrode of the second switching tube is connected with the second power supply, and the emitter electrode of the second switching tube is grounded through the eighth resistor.
7. The frequency converter control circuit of claim 6, wherein the energy storage control module comprises a second power tube, a second capacitor, a first voltage regulator tube and an energy storage device;
the collector of the second power tube is connected with the second end of the sixth resistor, the emitter of the second power tube is connected with one of the second capacitor, the cathode of the first voltage stabilizing tube and the first scheme of the energy storage device, the other end of the second capacitor, the anode of the first voltage stabilizing tube and the second end of the energy storage device are grounded, and the grid electrode of the second power tube is connected with the emitter of the second switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322244067.7U CN220605766U (en) | 2023-08-17 | 2023-08-17 | Frequency converter control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322244067.7U CN220605766U (en) | 2023-08-17 | 2023-08-17 | Frequency converter control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220605766U true CN220605766U (en) | 2024-03-15 |
Family
ID=90180097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322244067.7U Active CN220605766U (en) | 2023-08-17 | 2023-08-17 | Frequency converter control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220605766U (en) |
-
2023
- 2023-08-17 CN CN202322244067.7U patent/CN220605766U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202167837U (en) | PFC (Power Factor Correction) overcurrent protection circuit and air conditioner using same | |
| CN116191647A (en) | Emergency power supply of power equipment | |
| CN117239895B (en) | Intelligent power supply and distribution system | |
| CN218920273U (en) | Chip detection circuit | |
| CN208158120U (en) | A kind of active clamp circuit for IGBT overvoltage protection | |
| CN116984709B (en) | High-frequency inversion direct-current welding power supply circuit | |
| CN108322027A (en) | A kind of power conversion circuit | |
| CN216751302U (en) | Interactive double-direct-current power supply switching device | |
| CN117066651B (en) | Safety protection circuit of lithium battery spot welder | |
| CN202772555U (en) | Shoot-through protection circuit of photovoltaic grid-connected inverter | |
| CN220605766U (en) | Frequency converter control circuit | |
| CN113872314A (en) | 5G photoelectric module UPS power supply | |
| CN219875079U (en) | Seamless off-grid switching monitoring protection circuit | |
| CN116317668B (en) | Inversion protection circuit | |
| CN219657763U (en) | Abnormality alarm system of photovoltaic power station | |
| CN115207877B (en) | Automatic power switching circuit of electrical equipment | |
| CN107240928A (en) | A kind of power network lateral spacing power method of photovoltaic DC-to-AC converter | |
| CN215580519U (en) | 5G basic station emergency power supply device | |
| CN220358824U (en) | Low voltage ride through device of converter | |
| CN211018672U (en) | Active diode circuit and alternating current-direct current power supply conversion circuit | |
| CN208849441U (en) | Overvoltage crowbar | |
| CN221531295U (en) | Safety switching power supply circuit | |
| CN217935083U (en) | Protection circuit for restraining IGBT peak voltage | |
| CN220173215U (en) | Switch control circuit based on IGBT | |
| CN220857616U (en) | Novel energy-saving electricity load limiter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |