A permanent magnet drive module with undervoltage lockout and anti-misoperation

Abstract

The present invention discloses a permanent magnet drive module with undervoltage locking and anti-misoperation functions, which includes a capacitor undervoltage locking closing and opening circuit, a closing and opening feedback circuit, an anti-misoperation drive circuit, an input circuit, and an MCU. Among them, the capacitor undervoltage locking closing and opening circuit is electrically connected to the closing and opening feedback circuit and the anti-misoperation drive circuit respectively through the MCU. The capacitor undervoltage locking closing and opening circuit performs locking and normal closing and opening operations according to the charging condition of the capacitor. The closing and opening feedback circuit determines whether the permanent magnet drive module is normal according to the command received from the input circuit. The two optocouplers of the anti-misoperation drive circuit adopt interlocking drive. The present invention provides a permanent magnet drive module with undervoltage locking and anti-misoperation functions. The closing and opening operations cannot be performed when the energy storage capacitor is not fully charged, which prolongs the service life of the energy storage capacitor, and solves the disputes between the primary and secondary manufacturers due to unsuccessful operations. It also solves the problems such as the short circuit of the energy storage capacitor and the damage of the IGBT caused by external interference or power-on instantaneously.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and more particularly to a permanent magnet drive module with undervoltage lockout and anti-misoperation function. Background Art

[0002] With the improvement of social science and technology, the power industry and the majority of end users have higher and higher performance requirements for switchgear. At present, 6-35KV series permanent magnet vacuum circuit breakers have been widely used as medium voltage circuit breakers in developed countries, with high reliability, simple structure, safety, long service life and other characteristics.

[0003] However, the existing permanent magnet drive modules have low versatility and no unified external interface, making them inapplicable to other permanent magnet switches. There is no detection function for the voltage of the energy storage capacitor, which may cause operation failure. The primary and secondary manufacturers shirk responsibility for accidents caused by unsuccessful separation and combination operations. At the moment of power-on or under external interference, capacitor short circuits and IGBT damage may occur.

[0004] In view of the above defects, how to provide a permanent magnet drive module with undervoltage lockout and anti-misoperation is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a permanent magnet drive module with undervoltage lockout and anti-misoperation function. If the energy storage capacitor is not fully charged, the opening and closing operations cannot be performed, thereby extending the service life of the energy storage capacitor and resolving disputes caused by unsuccessful operations among primary and secondary manufacturers; and resolving problems such as short circuit of the energy storage capacitor and damage to the IGBT caused by external interference or power-on.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A permanent magnet drive module with undervoltage lockout and anti-misoperation, comprising a capacitor undervoltage lockout closing and opening circuit, a closing and opening readback circuit, an anti-misoperation drive circuit, an input circuit and an MCU; wherein the capacitor undervoltage lockout closing and opening circuit is electrically connected to the closing and opening readback circuit and the anti-misoperation drive circuit respectively through the MCU; the capacitor undervoltage lockout closing and opening circuit performs lockout and normal closing and opening operations according to the charging condition of the capacitor; the closing and opening readback circuit determines whether the permanent magnet drive module is normal according to the command received from the input circuit; and the two optocouplers of the anti-misoperation drive circuit are interlocked and driven.

[0008] Preferably, in the above-mentioned permanent magnet drive module with undervoltage locking and anti-misoperation, the capacitor undervoltage locking closing and opening circuit includes a first optocoupler; the A pin of the first optocoupler is connected to a fifth resistor and connected to VC1; the K pin of the first optocoupler is respectively connected to one end of a second capacitor and the K pin of a voltage regulator source; the other end of the second capacitor is connected to a sixth resistor, a seventh resistor, and connected to CO+; the sixth resistor is connected to the R pin of the voltage regulator source and an eighth resistor, and grounded; the seventh resistor is connected to the eighth resistor; the A pin of the voltage regulator source is grounded; the C pin of the first optocoupler is connected to the input end of the MCU; the E pin of the first optocoupler is grounded.

[0009] Preferably, in the above-mentioned permanent magnet drive module with undervoltage locking and anti-misoperation, the closing and opening feedback circuit includes: a second optocoupler and a third optocoupler; the C pins of the second optocoupler and the third optocoupler are connected to the MCU; the E pins of the second optocoupler and the third optocoupler are grounded; the K pins of the second optocoupler and the third optocoupler are grounded; the A pins of the second optocoupler and the third optocoupler are connected to the anti-misoperation drive circuit.

[0010] Preferably, in the above-mentioned permanent magnet drive module with undervoltage locking and anti-misoperation, the anti-misoperation drive circuit includes a sixth optocoupler, a seventh optocoupler, an eighth optocoupler, a ninth optocoupler, and an NGBT; the A pin of the sixth optocoupler is respectively connected to the K pin of the seventh optocoupler, the A pin of the eighth optocoupler, the K pin of the ninth optocoupler, and connected to the first IO port of the MCU; the K pins of the sixth optocoupler are respectively connected to the A pin of the seventh optocoupler, the K pin of the eighth optocoupler, the A pin of the ninth optocoupler, and connected to the second IO port; the output ends of the sixth optocoupler, the seventh optocoupler, the eighth optocoupler, and the ninth optocoupler are respectively connected to the G pole of an NGBT; four NGBTs and the permanent magnet mechanism form an H-bridge structure.

[0011] Preferably, in the above-mentioned permanent magnet drive module with undervoltage locking and anti-misoperation, the H-bridge structure includes: a permanent magnet mechanism, a first NGBT, a second NGBT, a third NGBT, and a fourth NGBT; the G pole of the first NGBT is connected to the output end of the seventh optocoupler; the C pole of the first NGBT is connected to the C pole of the fourth NGBT and connected to the power supply CO+; the E pole of the first NGBT is connected to the C pole of the second NGBT; the G pole of the second NGBT is connected to the output end of the eighth optocoupler; the E pole of the second NGBT is connected to the E pole of the third NGBT and grounded; the G pole of the third NGBT is connected to the output end of the ninth optocoupler; the C pole of the third NGBT is connected to the E pole of the fourth NGBT; the G pole of the fourth NGBT is connected to the output end of the sixth optocoupler; a permanent magnet mechanism is provided between the connection point of the first NGBT and the second NGBT and the connection point of the third NGBT and the fourth NGBT.

[0012] Preferably, in the above-mentioned permanent magnet drive module with undervoltage locking and anti-misoperation, the input circuit includes a fourth optocoupler and a fifth optocoupler; the input end of the fourth optocoupler is connected to an external input closing command, and the output end is connected to the input end of the MCU; the input end of the fifth optocoupler is connected to an external input opening command, and the output end is connected to the input end of the MCU.

[0013] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a permanent magnet drive module with undervoltage locking and anti-misoperation. The closing and opening operations cannot be performed when the energy storage capacitor is not fully charged, which prolongs the service life of the energy storage capacitor, solves the disputes between the primary and secondary manufacturers due to unsuccessful operations, and solves the problems such as short circuit of the energy storage capacitor and damage to the IGBT caused by external interference or instantaneous power-on. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0015] Figure 1 The drawings are the circuit schematic diagrams of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] The embodiment of the present invention discloses a permanent magnet drive module with undervoltage lockout and anti-misoperation. The circuit breaker cannot be operated for closing and opening when the energy storage capacitor is not fully charged, which prolongs the service life of the energy storage capacitor, solves the disputes between the primary and secondary manufacturers due to unsuccessful operations, and solves the problems such as short circuit of the energy storage capacitor and damage of IGBT caused by external interference or instantaneous power-on.

[0018] A permanent magnet drive module with undervoltage lockout and anti-misoperation includes a capacitor undervoltage lockout closing and opening circuit 1, a closing and opening read-back circuit 2, an anti-misoperation drive circuit 3, an input circuit 4 and an MCU. Among them, the capacitor undervoltage lockout closing and opening circuit 1 is electrically connected to the closing and opening read-back circuit 2 and the anti-misoperation drive circuit 3 through the MCU respectively. The capacitor undervoltage lockout closing and opening circuit 1 performs lockout and normal closing and opening operations according to the charging condition of the capacitor. The input circuit 4 sends a tripping command and a closing command to the MCU, the control output end of the MCU is connected to the closing and opening read-back circuit 2, and the closing and opening read-back circuit 2 determines whether the permanent magnet drive module is normal according to the received control output. The two optocouplers of the anti-misoperation drive circuit 3 adopt interlock drive.

[0019] To further optimize the above technical solution, the capacitor undervoltage lockout closing and opening circuit 1 includes a first optocoupler TF1. The A pin of the first optocoupler TF1 is connected to the fifth resistor R5 and connected to VC1. The K pin of the first optocoupler TF1 is respectively connected to one end of the second capacitor C2 and the K pin of the voltage stabilizer U2. The other end of the second capacitor C2 is connected to the sixth resistor R6, the seventh resistor R7, and connected to CO+. The sixth resistor R6 and the R pin of the voltage stabilizer U2 are connected to the eighth resistor R8 and grounded. The seventh resistor R7 is connected to the eighth resistor R8. The A pin of the voltage stabilizer U2 is grounded. The C pin of the first optocoupler TF1 is connected to the input end of the MCU. The E pin of the first optocoupler TF1 is grounded.

[0020] The second capacitor C2 obtains V1 after being divided by the sixth resistor R6. When the second capacitor C2 loses voltage, V1 < 2.5V, the KA pole of U2 is not conducting, the first optocoupler TF1 is not conducting, and after the MCU detects that the level is 1, the closing and opening operations are locked out. When the second capacitor is fully charged, V1 > 2.5V, the KA pole of U2 is conducting, the first optocoupler TF1 is conducting, and after the MCU detects that the level changes from 1 to 0, the normal closing and opening can be performed.

[0021] To further optimize the above technical solution, the closing and opening feedback circuit includes: the second optocoupler TF2 and the third optocoupler; the C pins of the second optocoupler TF2 and the third optocoupler are connected to the output end of the MCU; the E pins of the second optocoupler TF2 and the third optocoupler are grounded; the K pins of the second optocoupler TF2 and the third optocoupler are grounded; the A pin of the second optocoupler TF2 is connected to the anti-misoperation drive circuit 3 through the fourth resistor R4; the A pin of the third optocoupler is connected to the anti-misoperation drive circuit 3 through the third resistor R3.

[0022] To further optimize the above technical solution, the anti-misoperation drive circuit 3 includes the sixth optocoupler TF6, the seventh optocoupler TF7, the eighth optocoupler TF8, the ninth optocoupler TF9, and an NGBT; the A pin of the sixth optocoupler TF6 is respectively connected to the K pin of the seventh optocoupler TF7, the A pin of the eighth optocoupler TF8, the K pin of the ninth optocoupler TF9, and is connected to the first IO port of the MCU; the K pin of the sixth optocoupler TF6 is respectively connected to the A pin of the seventh optocoupler TF7, the K pin of the eighth optocoupler TF8, the A pin of the ninth optocoupler TF9, and is connected to the second IO port; the output ends of the sixth optocoupler TF6, the seventh optocoupler TF7, the eighth optocoupler TF8, and the ninth optocoupler TF9 are respectively connected to the G poles of an NGBT; the four NGBTs and the permanent magnet mechanism form an H-bridge structure.

[0023] To further optimize the above technical solution, a ninth resistor R9 and a first diode D1 are connected in parallel between the sixth optocoupler TF6 and the fourth NGBT Q4;

[0024] A ninth resistor R10 and a second diode D2 are connected in parallel between the seventh optocoupler TF7 and the first NGBT Q1;

[0025] A ninth resistor R11 and a third diode D3 are connected in parallel between the eighth optocoupler TF8 and the second NGBT Q2;

[0026] A ninth resistor R12 and a fourth diode D4 are connected in parallel between the ninth optocoupler TF9 and the third NGBT Q3.

[0027] Furthermore, a resistor and diode parallel structure is provided between the output end of the insulated gate bipolar transistor and the optocoupler, which can quickly release the voltage of the IGBT junction capacitance.

[0028] To further optimize the above technical solution, the H-bridge structure includes: a permanent magnet mechanism L1, a first NGBT Q1, a second NGBT Q2, a third NGBT Q3, and a fourth NGBT Q4; the G pole of the first NGBT Q1 is connected to the output terminal of the seventh optocoupler TF7; the C pole of the first NGBT Q1 is connected to the C pole of the fourth NGBT Q4 and is connected to the power supply CO+; the E pole of the first NGBT Q1 is connected to the C pole of the second NGBT Q2; the G pole of the second NGBT Q2 is connected to the output terminal of the eighth optocoupler TF8; the E pole of the second NGBT Q2 is connected to the E pole of the third NGBT Q3 and is grounded; the G pole of the third NGBT Q3 is connected to the output terminal of the ninth optocoupler TF9; the C pole of the third NGBT Q3 is connected to the E pole of the fourth NGBT Q4; the G pole of the fourth NGBT Q4 is connected to the output terminal of the sixth optocoupler TF6; a permanent magnet mechanism L1 is provided between the connection point of the first NGBT Q1 and the second NGBT Q2 and the connection point of the third NGBT Q3 and the fourth NGBT Q4.

[0029] When there is external interference or at the moment of power-on, the level of the I / O port may be abnormal. The A pole (K pole) of the seventh optocoupler TF7 is connected to the K pole (A pole) of the eighth optocoupler TF8. It is impossible for OUT2 and OUT3 to be high levels simultaneously, and Q1 and Q2 will not conduct simultaneously. Similarly, the A pole (K pole) of the sixth optocoupler TF6 is connected to the K pole (A pole) of the ninth optocoupler TF9. It is impossible for OUT1 and OUT4 to be high levels simultaneously, and Q3 and Q4 will not conduct simultaneously. This effectively prevents the short circuit between CO+ and GND1.

[0030] To further optimize the above technical solution, surge protection devices: varistors are provided between the C pole and the E pole of the second NGBT Q2 and between the C pole and the E pole of the third NGBT Q3.

[0031] To further optimize the above technical solution, the input circuit 4 includes a fourth optocoupler TF4 and a fifth optocoupler TF5; the input terminal of the fourth optocoupler TF4 is connected to an external input combination command, and the output terminal is connected to the input terminal of the MCU; the input terminal of the fifth optocoupler TF5 is connected to an external input separation command, and the output terminal is connected to the input terminal of the MCU.

[0032] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0033] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A permanent magnet drive module with undervoltage locking and anti-misoperation, characterized in that, It includes a capacitor undervoltage locking closing and opening circuit, a closing and opening reading-back circuit, an anti-misoperation drive circuit, an input circuit, and an MCU. Among them, the capacitor undervoltage locking closing and opening circuit is electrically connected to the closing and opening reading-back circuit and the anti-misoperation drive circuit through the MCU respectively. The capacitor undervoltage locking closing and opening circuit performs locking and normal closing and opening operations according to the charging condition of the capacitor. The closing and opening reading-back circuit determines whether the permanent magnet drive module is normal according to the command received from the input circuit. The two optocouplers of the anti-misoperation drive circuit adopt interlocking drive. The capacitor undervoltage locking closing and opening circuit includes a first optocoupler. The A pin of the first optocoupler is connected to a fifth resistor and connected to VC1. The K pin of the first optocoupler is respectively connected to one end of a second capacitor and the K pin of a voltage stabilizer. The other end of the second capacitor is connected to a sixth resistor, a seventh resistor, and connected to CO+. The sixth resistor, the R pin of the voltage stabilizer, and an eighth resistor are connected and grounded. The seventh resistor is connected to the eighth resistor. The A pin of the voltage stabilizer is grounded. The C pin of the first optocoupler is connected to the input end of the MCU. The E pin of the first optocoupler is grounded. After the second capacitor is voltage-divided by the sixth resistor to obtain V1, when the second capacitor loses voltage, V1 < 2.5V, the KA pole of the voltage stabilizer is not conducting, the first optocoupler is not conducting, after the MCU detects that the level is 1, the closing and opening operations are locked. When the second capacitor is fully charged, V1 > 2.5V, the KA pole of the voltage stabilizer is conducting, the first optocoupler is conducting, and after the MCU detects that the level changes from 1 to 0, the normal closing and opening can be carried out. The anti-misoperation drive circuit includes a sixth optocoupler, a seventh optocoupler, an eighth optocoupler, a ninth optocoupler, and an NGBT. The A pin of the sixth optocoupler is respectively connected to the K pin of the seventh optocoupler, the A pin of the eighth optocoupler, the K pin of the ninth optocoupler, and connected to the first IO port of the MCU. The K pins of the sixth optocoupler are respectively connected to the A pin of the seventh optocoupler, the K pin of the eighth optocoupler, the A pin of the ninth optocoupler, and connected to the second IO port. The output ends of the sixth optocoupler, the seventh optocoupler, the eighth optocoupler, and the ninth optocoupler are respectively connected to the G pole of an NGBT. The four NGBTs and the permanent magnet mechanism form an H-bridge structure.

2. The permanent magnet drive module with undervoltage locking and anti-misoperation according to claim 1, wherein The closing and opening reading-back circuit includes: a second optocoupler and a third optocoupler. The C pins of the second optocoupler and the third optocoupler are connected to the MCU. The E pins of the second optocoupler and the third optocoupler are grounded. The K pins of the second optocoupler and the third optocoupler are grounded. The A pins of the second optocoupler and the third optocoupler are connected to the anti-misoperation drive circuit.

3. The permanent magnet drive module with undervoltage locking and anti-misoperation according to claim 1, characterized in that, The H-bridge structure includes: a permanent magnet mechanism, a first NGBT, a second NGBT, a third NGBT, and a fourth NGBT; the G pole of the first NGBT is connected to the output end of the seventh optocoupler; the C pole of the first NGBT is connected to the C pole of the fourth NGBT and is connected to the power supply CO+; the E pole of the first NGBT is connected to the C pole of the second NGBT; the G pole of the second NGBT is connected to the output end of the eighth optocoupler; the E pole of the second NGBT is connected to the E pole of the third NGBT and grounded; the G pole of the third NGBT is connected to the output end of the ninth optocoupler; the C pole of the third NGBT is connected to the E pole of the fourth NGBT; the G pole of the fourth NGBT is connected to the output end of the sixth optocoupler; a permanent magnet mechanism is arranged between the connection point of the first NGBT and the second NGBT and the connection point of the third NGBT and the fourth NGBT.

4. A permanent magnet drive module with under-voltage locking and anti-misoperation according to any one of claims 1-3, characterized in that, The input circuit includes a fourth optocoupler and a fifth optocoupler; the input end of the fourth optocoupler accesses an external input combination command, and the output end is connected to the input end of the MCU; the input end of the fifth optocoupler accesses an external input separation command, and the output end is connected to the input end of the MCU.

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