CN211629860U - Coil and motor drive protection circuit of switch cabinet - Google Patents
Coil and motor drive protection circuit of switch cabinet Download PDFInfo
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- CN211629860U CN211629860U CN201922242163.1U CN201922242163U CN211629860U CN 211629860 U CN211629860 U CN 211629860U CN 201922242163 U CN201922242163 U CN 201922242163U CN 211629860 U CN211629860 U CN 211629860U
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Abstract
The utility model discloses a coil and motor drive protection circuit of cubical switchboard, it includes microprocessor, separating brake control circuit, combined floodgate control circuit, coil current sampling circuit, motor drive circuit and motor current sampling circuit, and microprocessor links to each other respectively with separating brake control circuit, combined floodgate control circuit, coil current sampling circuit, motor drive circuit and motor current sampling circuit. The utility model discloses can effectively prevent closing coils, separating brake coil and energy storage motor because the electric current is too big and damage.
Description
Technical Field
The utility model relates to a cubical switchboard field especially indicates a coil and motor drive protection circuit of cubical switchboard.
Background
The switch cabinet is used as an important component of an electric power system, and is required to be capable of accurately only needing opening and closing instructions and reliably operating for a long time. However, the existing switch cabinet is generally controlled to switch on and off by directly inputting voltage to a switching-on coil of a switching-on switch to perform switching-on operation, and by directly inputting voltage to a switching-off coil of a switching-off switch to perform switching-off operation; in addition, the switch cabinet also needs to drive the energy storage mechanism to stretch the closing or opening spring through the energy storage motor, so that the switch cabinet has corresponding potential energy. When switching on or switching off, the switching-on coil or the switching-off coil is electrified to enable the switching-on or switching-off electromagnet to act, and the switching-on or switching-off spring quickly switches on or switches off the moving contact of the circuit breaker, so that the existence time of electric arcs of the switching-on or switching-off can be shortened, and the purpose of quickly extinguishing the arcs is achieved. However, the existing switch cabinet has the following problems:
1. the existing closing coil and opening coil have no protection structure, and are easily damaged due to overlarge current if short circuit occurs;
2. the energy storage motor also has no protection structure, and if the energy storage motor is blocked, the energy storage motor is easy to damage due to overlarge current.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coil and motor drive protection circuit of cubical switchboard, it can effectively prevent closing coil, separating brake coil and energy storage motor because the electric current is too big and damage.
In order to achieve the above purpose, the solution of the present invention is:
a coil and motor drive protection circuit of a switch cabinet comprises:
a microprocessor for controlling the operation of the microprocessor,
the switching-off control circuit is connected with one output end of the microprocessor and is used for controlling the switching-off coil to be electrified or not according to the output signal of the microprocessor;
the switching-on control circuit is connected with one output end of the microprocessor and is used for controlling the switching-on or off of the switching-on coil according to the output signal of the microprocessor;
the coil current sampling circuit is connected with one input end of the microprocessor and is used for collecting the current of the electrified switching-off coil or switching-on coil and outputting the current to the microprocessor;
the motor driving circuit is connected with one output end of the microprocessor and is used for controlling whether the energy storage motor works or not according to an output signal of the microprocessor;
the motor current sampling circuit is connected with one output end of the microprocessor and is used for collecting the current of the energy storage motor and outputting the current to the microprocessor;
when the current of the opening coil collected by the coil current sampling circuit is greater than a first set threshold, the microprocessor cuts off the energization of the opening coil through the opening control circuit; when the current of the closing coil acquired by the coil current sampling circuit is greater than a second set threshold, the microprocessor cuts off the energization of the closing coil through the closing control circuit; when the current of the energy storage motor collected by the motor current sampling circuit is larger than a third set threshold value, the microprocessor controls the energy storage motor to stop working through the motor driving circuit.
The coil and motor drive protection circuit of the switch cabinet further comprises a power supply control circuit for supplying power to the switching-off control circuit, the switching-on control circuit and the motor drive circuit; the input end of the power supply control circuit is connected with a power supply, the output end of the power supply control circuit is connected with the power supply ends of the opening control circuit, the closing control circuit and the motor driving circuit, and the control end of the power supply control circuit is connected with the microprocessor.
The power supply control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first triode and a second triode; one end of the first resistor is connected with one end of the second resistor and the base electrode of the first triode, and the other end of the first resistor is used as the control end of the power supply control circuit; the other end of the second resistor and the emitting electrode of the first triode are grounded, the collecting electrode of the first triode is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor and the base electrode of the second triode, the other end of the fourth resistor is connected with the emitting electrode of the second triode and serves as the input end of the power supply control circuit, and the collecting electrode of the second triode is connected with one end of the first capacitor and serves as the output end of the power supply control circuit.
The brake-separating control circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a third triode, a fourth triode and a first MOS (metal oxide semiconductor) tube; wherein one end of a fifth resistor is used as the control end of the opening control circuit, the control end of the opening control circuit is connected with one output end of the microprocessor, the other end of the fifth resistor is connected with one end of a sixth resistor and the base electrode of a third triode, the other end of the sixth resistor and the emitter electrode of the third triode are grounded, the collector electrode of the third triode is connected with one end of a seventh resistor and the base electrode of a fourth triode, the other end of the seventh resistor and the collector electrode of the fourth triode are connected and used as the power supply end of the opening control circuit, the emitter electrode of the fourth triode is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with one end of a ninth resistor and the grid electrode of a first MOS tube, the other end of the ninth resistor is grounded, the source electrode of the first MOS tube is connected with one end of a tenth resistor, the other end of the tenth resistor is grounded, the drain electrode of the first MOS tube is connected with the anode of the first, the negative electrode of the first diode is used as a second driving end of the opening control circuit, the second driving end of the opening control circuit is connected with an opening power supply, and the first driving end and the second driving end of the opening control circuit are respectively connected with two ends of the opening coil; the switching-on control circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a second diode, a fifth triode, a sixth triode and a second MOS (metal oxide semiconductor) tube; wherein one end of an eleventh resistor is used as the control end of the switching-on control circuit, the control end of the switching-on control circuit is connected with one output end of the microprocessor, the other end of the eleventh resistor is connected with one end of a twelfth resistor and the base electrode of a fifth triode, the other end of the twelfth resistor and the emitter electrode of the fifth triode are grounded, the collector electrode of the fifth triode is connected with one end of a thirteenth resistor and the base electrode of a sixth triode, the other end of the thirteenth resistor is connected with the collector electrode of the sixth triode and is used as the power supply end of the switching-on control circuit, the emitter electrode of the sixth triode is connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with one end of a fifteenth resistor and the grid electrode of a second MOS tube, the other end of the fifteenth resistor is grounded, the source electrode of the second MOS tube is connected with the common end of the tenth resistor and the first MOS tube, the drain electrode of the second MOS tube, the negative electrode of the second diode is used as the second driving end of the closing control circuit, the second driving end of the closing control circuit is connected with a closing power supply, and the first driving end and the second driving end of the closing control circuit are respectively connected with two ends of the closing coil.
The coil current sampling circuit comprises a sixteenth resistor, wherein one end of the sixteenth resistor is used as the input end of the coil current sampling circuit, the other end of the sixteenth resistor is used as the output end of the coil current sampling circuit, the input end of the coil current sampling circuit is connected with the source electrode of the first MOS tube and the source electrode of the second MOS tube, and the output end of the coil current sampling circuit is connected with one input end of the microprocessor.
The coil current sampling circuit further comprises a second capacitor, one end of the second capacitor is connected with the output end of the coil current sampling circuit, and the other end of the second capacitor is grounded.
The coil and motor drive protection circuit of the switch cabinet further comprises a coil overcurrent protection circuit; the coil overcurrent protection circuit comprises a seventeenth resistor, an eighteenth resistor, a third diode, a fourth diode and a thyristor, wherein one end of the seventeenth resistor is connected with a source electrode of the first MOS tube and a source electrode of the second MOS tube, the other end of the seventeenth resistor is connected with one end of the eighteenth resistor and a control electrode of the thyristor, the other end of the eighteenth resistor and a cathode of the thyristor are grounded, an anode of the thyristor is connected with a cathode of the third diode and a cathode of the fourth diode, an anode of the third diode is connected with a grid electrode of the first MOS tube, and an anode of the fourth diode is connected with a grid electrode of the second MOS tube.
The motor driving circuit comprises a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fifth diode, a seventh triode, an eighth triode, a ninth triode and a third MOS (metal oxide semiconductor) tube; wherein one end of a nineteenth resistor is used as the control end of the motor driving circuit, the control end of the motor driving circuit is connected with one output end of the microprocessor, the other end of the nineteenth resistor is connected with one end of a twentieth resistor and the base electrode of a seventh triode, the other end of the twentieth resistor and the emitting electrode of the seventh triode are grounded, the collecting electrode of the seventh triode is connected with one end of a twenty-first resistor, the base electrode of an eighth triode and the base electrode of the ninth triode, the other end of the twenty-first resistor is connected with the collecting electrode of the eighth triode and is used as the power supply end of the motor driving circuit, the emitting electrode of the eighth triode is connected with the emitting electrode of the ninth triode and one end of a twenty-second resistor, the collecting electrode of the ninth triode is grounded, the other end of the twenty-second resistor is connected with one end of a twenty, the source electrode of the third MOS tube is connected with one end of a twenty-fourth resistor, the other end of the twenty-fourth resistor is grounded, the drain electrode of the third MOS tube is connected with the anode of the fifth diode and serves as the first driving end of the motor driving circuit, the cathode of the fifth diode serves as the second driving end of the motor driving circuit, the second driving end of the motor driving circuit is connected with a motor power supply, and the second driving end and the first driving end of the motor driving circuit are used for being connected with the input end and the output end of the energy storage motor respectively.
The motor driving circuit further comprises a twenty-fifth resistor and a third capacitor, one end of the twenty-fifth resistor is connected with the second driving end of the motor driving circuit, the other end of the twenty-fifth resistor is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the first driving end of the motor driving circuit.
The motor current sampling circuit comprises a twenty-sixth resistor, one end of the twenty-sixth resistor is used as the input end of the motor current sampling circuit, the other end of the twenty-sixth resistor is used as the output end of the motor current sampling circuit, the input end of the motor current sampling circuit is connected with the source electrode of the third MOS tube, and the output end of the motor current sampling circuit is connected with one input end of the microprocessor.
After the scheme is adopted, the utility model has the characteristics of it is following:
1. the microprocessor of the utility model can detect the current of the electrified separating brake coil through the coil current collecting circuit, when the separating brake coil has overcurrent, the microprocessor cuts off the electrification of the separating brake coil through the separating brake control circuit, and carries out overcurrent protection on the separating brake coil;
2. the microprocessor of the utility model can detect the current of the electrified closing coil through the coil current acquisition circuit, when the closing coil has overcurrent, the microprocessor cuts off the electrification of the closing coil through the closing control circuit, and carries out overcurrent protection on the closing coil;
3. the microprocessor of the utility model can detect the current of the working energy storage motor through the motor current acquisition circuit, when the energy storage motor has overcurrent, the microprocessor controls the energy storage motor to stop working through the motor driving circuit, and carries out overcurrent protection on the energy storage motor;
4. the utility model discloses a microprocessor can control separating brake control circuit through power supply control circuit, whether closing brake control circuit and motor drive circuit's power end receives the electricity, like this at separating brake control circuit, closing brake control circuit and motor drive circuit need not carry out the during operation, microprocessor can pass through power supply control circuit control separating brake control circuit, closing brake control circuit and motor drive circuit's power end does not receive the electricity, make separating brake control circuit, closing brake control circuit and motor drive circuit can not work, thereby avoid interference signal to arouse separating brake control circuit, closing brake control circuit and motor drive circuit maloperation.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
As shown in fig. 1, the utility model discloses a coil and motor drive protection circuit of a switch cabinet, which comprises a microprocessor 1, an opening control circuit 2, a closing control circuit 3, a coil current sampling circuit 4, a motor drive circuit 5 and a motor current sampling circuit 6; the opening control circuit 2 is connected with an output end of the microprocessor 1, and the opening control circuit 2 is used for controlling whether the opening coil is electrified or not according to an output signal of the microprocessor 1; the switching-on control circuit 3 is connected with an output end of the microprocessor 1, and the switching-on control circuit 3 is used for controlling whether a switching-on coil is electrified or not according to an output signal of the microprocessor 1; the coil current sampling circuit 4 is connected with one input end of the microprocessor 1, and the coil current sampling circuit 4 is used for collecting the current of the electrified switching-off coil or switching-on coil and outputting the current to the microprocessor 1; the motor driving circuit 5 is connected with an output end of the microprocessor 1, and the motor driving circuit 5 is used for controlling whether the energy storage motor works or not according to an output signal of the microprocessor 1; the motor current sampling circuit 6 is connected with one output end of the microprocessor 1, and the motor current sampling circuit 6 is used for collecting the current of the energy storage motor and outputting the current to the microprocessor 1; when the current of the opening coil collected by the coil current sampling circuit 4 is larger than a first set threshold, the microprocessor 1 cuts off the energization of the opening coil through the opening control circuit 2; when the current of the closing coil collected by the coil current sampling circuit 4 is larger than a second set threshold, the microprocessor 1 cuts off the energization of the closing coil through the closing control circuit 3; and when the energy storage motor current collected by the motor current sampling circuit 6 is greater than a third set threshold, the microprocessor 1 controls the energy storage motor to stop working through the motor driving circuit 5.
When the circuit of the utility model is actually used, the switching-off coil, the switching-on coil and the energy storage motor can be controlled by external instructions input into the microprocessor 1, and switching-off operation, switching-on operation and energy storage operation are carried out; when the current of the opening coil is larger than a first set threshold value, namely when the opening coil is over-current, the microprocessor 1 cuts off the energization of the opening coil through the opening control circuit 2, so that the opening coil is subjected to over-current protection; when the microprocessor 1 energizes the closing coil through the closing control circuit 3, the microprocessor 1 can detect the current of the energized closing coil through the coil current acquisition circuit 4, and when the current of the closing coil is larger than a second set threshold value, namely when the closing coil is over-current, the microprocessor 1 cuts off the energization of the closing coil through the closing control circuit 3 so as to perform over-current protection on the closing coil; after the microprocessor 1 controls the energy storage motor to work through the motor driving circuit 5, the microprocessor 1 can detect the current of the working energy storage motor through the motor current acquisition circuit 6, and when the current of the energy storage motor is larger than a third set threshold value, namely when the energy storage motor overflows, the microprocessor 1 controls the energy storage motor to stop working through the motor driving circuit 5, so that overcurrent protection is performed on the energy storage motor.
As shown in fig. 1, the present invention may further include a power supply control circuit 7 for supplying power to the switching-off control circuit 2, the switching-on control circuit 3 and the motor driving circuit; the input end of the power supply control circuit 7 is connected with a power supply VDD which can be a 12V direct current power supply, the output end of the power supply control circuit 7 is connected with the power ends of the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 5 so that the power supply control circuit 7 can supply power to the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 5, and the control end of the power supply control circuit 7 is connected with the microprocessor 1 so that the microprocessor 1 controls the power supply control circuit 7; therefore, when the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 4 do not need to work, the microprocessor 1 can control the power ends of the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 5 to be free from power supply through the power supply control circuit 7, so that the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 5 cannot work, and misoperation of the opening control circuit 2, the closing control circuit 3 and the motor driving circuit 5 caused by interference signals is avoided. As shown in fig. 1, specifically, the power supply control circuit 7 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first transistor Q1, and a second transistor Q2; one end of the first resistor R1 is connected with one end of the second resistor R2 and the base of the first triode Q1, and the other end of the first resistor R2 is used as the control end of the power supply control circuit 7; the other end of the second resistor R2 is grounded with the emitter of the first triode Q1, the collector of the first triode Q1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4 and the base of the second triode Q2, the other end of the fourth resistor R4 is connected with the emitter of the second triode Q2 and serves as the input end of the power supply control circuit 7, and the collector of the second triode Q1 is connected with one end of the first capacitor C1 and serves as the output end of the power supply control circuit 7; when the microprocessor 7 inputs a high level signal to the control end of the power supply control circuit 7, the first triode Q3 is conducted to conduct the second triode Q2, so that the output end of the power supply control circuit 7 outputs power to the power ends of the opening control circuit 2, the closing control circuit 3 and the motor drive circuit 5; when the microprocessor 7 inputs a low level signal to the control end of the power supply control circuit 7, the first triode Q3 is turned off to turn off the second triode Q2, so that the output end of the power supply control circuit 7 does not output power to the power supply ends of the opening control circuit 2, the closing control circuit 3 and the motor drive circuit 5.
As shown in fig. 1, the opening control circuit 2 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first diode D1, a third transistor Q3, a fourth transistor Q4, and a first MOS transistor M1; wherein one end of the fifth resistor R1 is used as the control end of the opening control circuit 2, the control end of the opening control circuit 2 is connected with one output end of the microprocessor 1, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6 and the base of the third triode Q3, the other end of the sixth resistor R6 and the emitter of the third triode Q3 are grounded, the collector of the third triode Q3 is connected with one end of the seventh resistor R7 and the base of the fourth triode Q4, the other end of the seventh resistor R7 and the collector of the fourth triode Q4 are connected with each other and used as the power supply end of the opening control circuit 2, the emitter of the fourth triode Q4 is connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected with one end of the ninth resistor R9 and the gate of the first MOS transistor M1, the other end of the ninth resistor R9 is grounded, the source of the first MOS transistor M1 is connected with one end of the tenth resistor R10 and the other end of the tenth resistor R10, the drain of the first MOS transistor M1 is connected to the anode of the first diode D1 and serves as the first driving end of the opening control circuit 2, the cathode of the first diode D1 serves as the second driving end of the opening control circuit 2, the second driving end of the opening control circuit is connected to an opening power supply DC1, and the first driving end and the second driving end of the opening control circuit 2 are respectively connected to two ends of the opening coil; thus, when the power supply end of the opening control circuit 2 is powered on, when the microprocessor 1 inputs a low level signal to the control end of the opening control circuit 2, the third triode Q3 is turned off to turn on the fourth triode Q4, so that the first MOS transistor M1 is turned on, and the first driving end of the opening control circuit 2 can be grounded through the first MOS transistor M1 and the tenth resistor R10, so that the opening coil can form a loop to turn on the opening coil; when the microprocessor 1 inputs a high level signal to the control terminal of the switching-off control circuit 2, the third transistor Q3 is turned on to turn off the fourth transistor Q4, and further turn off the first MOS transistor M1, so that the first driving terminal of the switching-off control circuit 2 cannot be grounded, and the switching-off coil cannot form a loop, so that the switching-off coil is not energized.
As shown in fig. 1, the closing control circuit 3 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second diode D2, a fifth triode Q5, a sixth triode Q6, and a second MOS transistor M2; wherein one end of an eleventh resistor R11 is used as a control end of the closing control circuit 3, the control end of the closing control circuit 3 is connected to an output end of the microprocessor 1, the other end of the eleventh resistor R11 is connected to one end of a twelfth resistor R12 and a base of a fifth triode Q5, the other end of the twelfth resistor R12 and an emitter of the fifth triode Q5 are grounded, a collector of the fifth triode Q5 is connected to one end of a thirteenth resistor R13 and a base of a sixth triode Q6, the other end of the thirteenth resistor R13 and a collector of the sixth triode Q6 are connected to each other and used as a power supply end of the closing control circuit 3, an emitter of the sixth triode Q6 is connected to one end of a fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to one end of a fifteenth resistor R15 and a gate of the second MOS transistor M8, the other end of the fifteenth resistor R15 is grounded, a source of the second MOS transistor M2 is connected to a common end of the tenth resistor R10 and the first MOS transistor M36, the drain of the second MOS transistor M2 is connected to the anode of the second diode D2 and serves as the first driving end of the closing control circuit 3, the cathode of the second diode D2 serves as the second driving end of the closing control circuit 3, the second driving end of the closing control circuit 3 is connected to a closing power supply DC2, and the first driving end and the second driving end of the closing control circuit 3 are respectively connected to two ends of a closing coil. Thus, when the power supply end of the closing control circuit 3 receives power, when the microprocessor 1 inputs a low level signal to the control end of the closing control circuit 3, the fifth triode Q5 is turned off to turn on the sixth triode Q6, and further turn on the second MOS transistor M2, so that the first driving end of the closing control circuit 2 can be grounded through the second MOS transistor M2 and the tenth resistor R10, and the closing coil can form a loop to turn on the closing coil; when the microprocessor 1 inputs a high level signal to the control end of the switching-on control circuit 3, the fifth triode Q5 is turned on to turn off the sixth triode Q6, and further turn off the second MOS transistor M2, so that the first driving end of the switching-on control circuit 3 cannot be grounded, and the switching-on coil cannot form a loop, so that the switching-on coil is not powered on.
As shown in fig. 1, the coil current sampling circuit 4 includes a sixteenth resistor R16, wherein one end of the sixteenth resistor R16 serves as an input end of the coil current sampling circuit 4, the other end of the sixteenth resistor R16 serves as an output end of the coil current sampling circuit 4, the input end of the coil current sampling circuit 4 is connected to the source electrode of the first MOS transistor M1 and the source electrode of the second MOS transistor M2, and the output end of the coil current sampling circuit 4 is connected to one input end of the microprocessor. It should be noted here that the closing coil and the opening coil cannot be energized simultaneously, so that when the opening coil is energized but the closing coil is not energized, the output signal of the output end of the coil current sampling circuit 4 corresponds to the current of the opening coil; when the closing coil is electrified and the opening coil is not electrified, the output signal of the output end of the coil current sampling circuit 4 corresponds to the current of the closing coil; therefore, after the microprocessor 1 energizes the opening coil through the opening control circuit 2, the microprocessor 1 can detect the current of the energized opening coil through the coil current acquisition circuit 4; after the microprocessor 1 energizes the closing coil through the closing control circuit 3, the microprocessor 1 can detect the current of the energized closing coil through the coil current collecting circuit 4. As shown in fig. 1, the coil current sampling circuit 4 may further include a second capacitor C2, one end of the second capacitor C2 is connected to the output terminal of the coil current sampling circuit 4, and the other end of the second capacitor C2 is grounded, so that filtering is performed by the second capacitor C2.
As shown in fig. 1, the present invention may further include a coil overcurrent protection circuit 8, wherein the coil overcurrent protection circuit 8 includes a seventeenth resistor R17, an eighteenth resistor R18, a third diode Q3, a fourth diode Q4 and a thyristor SCR, wherein one end of the seventeenth resistor R17 is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2, the other end of the seventeenth resistor R17 is connected to one end of the eighteenth resistor R18 and the control electrode of the thyristor SCR, the other end of the eighteenth resistor R18 and the cathode of the thyristor SCR are grounded, the anode of the thyristor SCR is connected to the cathode of the third diode D3 and the cathode of the fourth diode D4, the anode of the third diode D3 is connected to the gate of the first MOS transistor M1, the anode of the fourth diode D4 is connected to the gate of the second MOS transistor M2, so that the resistance ratio of the seventeenth resistor R17 and the eighteenth resistor R18 can be adjusted to make the switching coil not be energized, if the opening coil is over-current, the thyristor SCR is switched on, and then the grid electrode of the first MOS tube M1 is pulled low, so that the first MOS tube M1 is switched off, the first driving end of the opening control circuit 2 cannot be grounded, and the opening coil cannot form a loop, so that the opening coil is not electrified; when the closing coil is electrified and the opening coil is not electrified, if the closing coil is overcurrent, the thyristor SCR is switched on, and then the grid electrode of the second MOS tube M2 is pulled down to switch off the second MOS tube M2, so that the first driving end of the closing control circuit 3 cannot be grounded, and the closing coil cannot form a loop, so that the closing coil is not electrified; the resistance proportion of the seventeenth resistor R17 and the eighteenth resistor R18 can be adjusted, so that the coil overcurrent protection circuit 8 controls the opening coil current or the closing coil current required by the first MOS transistor M1 or the second MOS transistor to be switched off to be larger than the first threshold value and the second threshold value, and when the microprocessor 1 fails, the coil overcurrent protection circuit 8 can perform overcurrent protection on the closing coil and the opening coil to play a standby role.
As shown in fig. 1, the motor driving circuit 5 includes a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a fifth diode D5, a seventh transistor Q7, an eighth transistor Q8, a ninth transistor Q9, and a third MOS transistor M3; wherein one end of a nineteenth resistor R19 is used as a control end of the motor driving circuit 5, the control end of the motor driving circuit 5 is connected with one output end of the microprocessor 1, the other end of a nineteenth resistor R19 is connected with one end of a twentieth resistor R20 and a base of a seventh triode Q7, the other end of a twentieth resistor R20 and an emitter of the seventh triode Q7 are grounded, a collector of the seventh triode Q7 is connected with one end of a twenty-first resistor R21, a base of an eighth triode Q8 and a base of a ninth triode Q9, the other end of the twenty-first resistor R21 is connected with a collector of an eighth triode Q8 and is used as a power supply end of the motor driving circuit 5, an emitter of the eighth triode Q8 is connected with an emitter of the ninth triode Q9 and one end of a twenty-second resistor R2, a collector of the ninth triode Q9 is grounded, the other end of a twenty-second resistor R22 is connected with one end of a twenty-third resistor R23 and a, the other end of the twenty-third resistor R22 is grounded, the source of the third MOS transistor M3 is connected to one end of the twenty-fourth resistor R24, the other end of the twenty-fourth resistor R24 is grounded, the drain of the third MOS transistor M3 is connected to the anode of the fifth diode D5 and serves as the first driving end of the motor driving circuit 5, the cathode of the fifth diode D5 serves as the second driving end of the motor driving circuit 5, the second driving end of the motor driving circuit 5 is connected to a motor power supply DC3, and the second driving end and the first driving end of the motor driving circuit 5 are respectively connected to the input end and the output end of the energy storage motor, so that when the power supply end of the motor driving circuit 5 is powered, when the microprocessor 1 inputs a low level signal to the control end of the motor driving circuit 5, the seventh triode Q7 is turned off to turn on the third MOS transistor M3, so that the first driving end of the motor driving circuit 5 can be grounded through the third MOS transistor M3 and the twenty-fourth resistor R24, so that the energy storage motor can form a loop to enable the energy storage motor to work; the seventh transistor Q7 is turned on to turn off the third MOS transistor M3, so that the first driving terminal of the motor driving circuit 5 cannot be grounded, and the energy storage motor cannot form a loop, so that the energy storage motor cannot work; therefore, the microprocessor 1 inputs a PWM signal to the control end of the energy storage motor, and the current of the energy storage motor can be controlled by controlling the duty ratio of the PWM signal. As shown in fig. 1, the motor driving circuit 5 further includes a twenty-fifth resistor R25 and a third capacitor C3, one end of the twenty-fifth resistor R25 is connected to the second driving end of the motor driving circuit 5, the other end of the twenty-fifth resistor R25 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to the first driving end of the motor driving circuit 5, so that filtering is performed through the twenty-fifth resistor R25 and the third capacitor C3, and interference of the energy storage motor to the circuit during operation can be reduced.
As shown in fig. 1, the motor current sampling circuit 6 includes a twenty-sixth resistor R26, one end of the twenty-sixth resistor R26 serves as an input end of the motor current sampling circuit 6, the other end of the twenty-sixth resistor R26 serves as an output end of the motor current sampling circuit 6, the input end of the motor current sampling circuit 6 is connected to a source of the third MOS transistor M3, so that an output signal at the output end of the motor current sampling circuit 6 corresponds to a current of the energy storage motor, and the output end of the motor current sampling circuit 6 is connected to an input end of the microprocessor 1. As shown in fig. 1, the motor current sampling circuit 6 may further include a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the output terminal of the motor current sampling circuit 4, and the other end of the fourth capacitor C4 is grounded, so that filtering is performed through the fourth capacitor C4.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.
Claims (10)
1. The utility model provides a coil and motor drive protection circuit of cubical switchboard which characterized in that: the method comprises the following steps:
a microprocessor for controlling the operation of the microprocessor,
the switching-off control circuit is connected with one output end of the microprocessor and is used for controlling the switching-off coil to be electrified or not according to the output signal of the microprocessor;
the switching-on control circuit is connected with one output end of the microprocessor and is used for controlling the switching-on or off of the switching-on coil according to the output signal of the microprocessor;
the coil current sampling circuit is connected with one input end of the microprocessor and is used for collecting the current of the electrified switching-off coil or switching-on coil and outputting the current to the microprocessor;
the motor driving circuit is connected with one output end of the microprocessor and is used for controlling whether the energy storage motor works or not according to an output signal of the microprocessor;
the motor current sampling circuit is connected with one output end of the microprocessor and is used for collecting the current of the energy storage motor and outputting the current to the microprocessor;
when the current of the opening coil collected by the coil current sampling circuit is greater than a first set threshold, the microprocessor cuts off the energization of the opening coil through the opening control circuit; when the current of the closing coil acquired by the coil current sampling circuit is greater than a second set threshold, the microprocessor cuts off the energization of the closing coil through the closing control circuit; when the current of the energy storage motor collected by the motor current sampling circuit is larger than a third set threshold value, the microprocessor controls the energy storage motor to stop working through the motor driving circuit.
2. The coil and motor drive protection circuit of a switchgear as claimed in claim 1, wherein: the power supply control circuit is used for supplying power to the switching-off control circuit, the switching-on control circuit and the motor driving circuit; the input end of the power supply control circuit is connected with a power supply, the output end of the power supply control circuit is connected with the power supply ends of the opening control circuit, the closing control circuit and the motor driving circuit, and the control end of the power supply control circuit is connected with the microprocessor.
3. The coil and motor drive protection circuit of a switchgear as claimed in claim 2, wherein: the power supply control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first triode and a second triode;
one end of the first resistor is connected with one end of the second resistor and the base electrode of the first triode, and the other end of the first resistor is used as the control end of the power supply control circuit; the other end of the second resistor and the emitting electrode of the first triode are grounded, the collecting electrode of the first triode is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the fourth resistor and the base electrode of the second triode, the other end of the fourth resistor is connected with the emitting electrode of the second triode and serves as the input end of the power supply control circuit, and the collecting electrode of the second triode is connected with one end of the first capacitor and serves as the output end of the power supply control circuit.
4. A switch cabinet coil and motor drive protection circuit as claimed in claim 2 or 3, characterized in that: the brake-separating control circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a third triode, a fourth triode and a first MOS (metal oxide semiconductor) tube; wherein one end of a fifth resistor is used as the control end of the opening control circuit, the control end of the opening control circuit is connected with one output end of the microprocessor, the other end of the fifth resistor is connected with one end of a sixth resistor and the base electrode of a third triode, the other end of the sixth resistor and the emitter electrode of the third triode are grounded, the collector electrode of the third triode is connected with one end of a seventh resistor and the base electrode of a fourth triode, the other end of the seventh resistor and the collector electrode of the fourth triode are connected and used as the power supply end of the opening control circuit, the emitter electrode of the fourth triode is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with one end of a ninth resistor and the grid electrode of a first MOS tube, the other end of the ninth resistor is grounded, the source electrode of the first MOS tube is connected with one end of a tenth resistor, the other end of the tenth resistor is grounded, the drain electrode of the first MOS tube is connected with the anode of the first, the negative electrode of the first diode is used as a second driving end of the opening control circuit, the second driving end of the opening control circuit is connected with an opening power supply, and the first driving end and the second driving end of the opening control circuit are respectively connected with two ends of the opening coil;
the switching-on control circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a second diode, a fifth triode, a sixth triode and a second MOS (metal oxide semiconductor) tube; wherein one end of an eleventh resistor is used as the control end of the switching-on control circuit, the control end of the switching-on control circuit is connected with one output end of the microprocessor, the other end of the eleventh resistor is connected with one end of a twelfth resistor and the base electrode of a fifth triode, the other end of the twelfth resistor and the emitter electrode of the fifth triode are grounded, the collector electrode of the fifth triode is connected with one end of a thirteenth resistor and the base electrode of a sixth triode, the other end of the thirteenth resistor is connected with the collector electrode of the sixth triode and is used as the power supply end of the switching-on control circuit, the emitter electrode of the sixth triode is connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with one end of a fifteenth resistor and the grid electrode of a second MOS tube, the other end of the fifteenth resistor is grounded, the source electrode of the second MOS tube is connected with the common end of the tenth resistor and the first MOS tube, the drain electrode of the second MOS tube, the negative electrode of the second diode is used as the second driving end of the closing control circuit, the second driving end of the closing control circuit is connected with a closing power supply, and the first driving end and the second driving end of the closing control circuit are respectively connected with two ends of the closing coil.
5. The coil and motor drive protection circuit of a switchgear as claimed in claim 4, wherein: the coil current sampling circuit comprises a sixteenth resistor, wherein one end of the sixteenth resistor is used as the input end of the coil current sampling circuit, the other end of the sixteenth resistor is used as the output end of the coil current sampling circuit, the input end of the coil current sampling circuit is connected with the source electrode of the first MOS tube and the source electrode of the second MOS tube, and the output end of the coil current sampling circuit is connected with one input end of the microprocessor.
6. The coil and motor drive protection circuit of a switchgear as claimed in claim 5, wherein: the coil current sampling circuit further comprises a second capacitor, one end of the second capacitor is connected with the output end of the coil current sampling circuit, and the other end of the second capacitor is grounded.
7. The coil and motor drive protection circuit of a switchgear as claimed in claim 5, wherein: the coil overcurrent protection circuit is also included; the coil overcurrent protection circuit comprises a seventeenth resistor, an eighteenth resistor, a third diode, a fourth diode and a thyristor, wherein one end of the seventeenth resistor is connected with a source electrode of the first MOS tube and a source electrode of the second MOS tube, the other end of the seventeenth resistor is connected with one end of the eighteenth resistor and a control electrode of the thyristor, the other end of the eighteenth resistor and a cathode of the thyristor are grounded, an anode of the thyristor is connected with a cathode of the third diode and a cathode of the fourth diode, an anode of the third diode is connected with a grid electrode of the first MOS tube, and an anode of the fourth diode is connected with a grid electrode of the second MOS tube.
8. The coil and motor drive protection circuit of a switchgear as claimed in claim 2, wherein: the motor driving circuit comprises a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a fifth diode, a seventh triode, an eighth triode, a ninth triode and a third MOS (metal oxide semiconductor) tube; wherein one end of a nineteenth resistor is used as the control end of the motor driving circuit, the control end of the motor driving circuit is connected with one output end of the microprocessor, the other end of the nineteenth resistor is connected with one end of a twentieth resistor and the base electrode of a seventh triode, the other end of the twentieth resistor and the emitting electrode of the seventh triode are grounded, the collecting electrode of the seventh triode is connected with one end of a twenty-first resistor, the base electrode of an eighth triode and the base electrode of the ninth triode, the other end of the twenty-first resistor is connected with the collecting electrode of the eighth triode and is used as the power supply end of the motor driving circuit, the emitting electrode of the eighth triode is connected with the emitting electrode of the ninth triode and one end of a twenty-second resistor, the collecting electrode of the ninth triode is grounded, the other end of the twenty-second resistor is connected with one end of a twenty, the source electrode of the third MOS tube is connected with one end of a twenty-fourth resistor, the other end of the twenty-fourth resistor is grounded, the drain electrode of the third MOS tube is connected with the anode of the fifth diode and serves as the first driving end of the motor driving circuit, the cathode of the fifth diode serves as the second driving end of the motor driving circuit, the second driving end of the motor driving circuit is connected with a motor power supply, and the second driving end and the first driving end of the motor driving circuit are used for being connected with the input end and the output end of the energy storage motor respectively.
9. The coil and motor drive protection circuit of a switchgear as claimed in claim 8, wherein: the motor driving circuit further comprises a twenty-fifth resistor and a third capacitor, one end of the twenty-fifth resistor is connected with the second driving end of the motor driving circuit, the other end of the twenty-fifth resistor is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the first driving end of the motor driving circuit.
10. The coil and motor drive protection circuit of a switchgear as claimed in claim 8, wherein: the motor current sampling circuit comprises a twenty-sixth resistor, one end of the twenty-sixth resistor is used as the input end of the motor current sampling circuit, the other end of the twenty-sixth resistor is used as the output end of the motor current sampling circuit, the input end of the motor current sampling circuit is connected with the source electrode of the third MOS tube, and the output end of the motor current sampling circuit is connected with one input end of the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922242163.1U CN211629860U (en) | 2019-12-13 | 2019-12-13 | Coil and motor drive protection circuit of switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922242163.1U CN211629860U (en) | 2019-12-13 | 2019-12-13 | Coil and motor drive protection circuit of switch cabinet |
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| CN211629860U true CN211629860U (en) | 2020-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340769A (en) * | 2021-06-24 | 2021-09-03 | 江西德安万年青水泥有限公司 | 110KV total drop GIS micro-water density on-line monitoring system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340769A (en) * | 2021-06-24 | 2021-09-03 | 江西德安万年青水泥有限公司 | 110KV total drop GIS micro-water density on-line monitoring system |
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