CN211374931U - Intelligent starting point line insulation detection circuit - Google Patents
Intelligent starting point line insulation detection circuit Download PDFInfo
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- CN211374931U CN211374931U CN201921875671.7U CN201921875671U CN211374931U CN 211374931 U CN211374931 U CN 211374931U CN 201921875671 U CN201921875671 U CN 201921875671U CN 211374931 U CN211374931 U CN 211374931U
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Abstract
The utility model discloses an intelligent starting point circuit insulation detection circuitry, detection circuitry includes: the relay switching device comprises a key pressure control module, a microprocessor control module, a relay driving module and a relay switching module, wherein the input end of the microprocessor control module is connected with the key pressure control module, the output end of the microprocessor control module is connected with the input end of the relay driving module, and the output end of the relay driving module is connected with the relay switching module. The utility model discloses in implementing, carry out the insulation measurement of each state through adopting the automatic high-pressure switch of the insulating detection circuitry control of circuit, greatly reduced insulation measurement's the degree of difficulty, improved measurement operating efficiency, reduced measurement risk and cost.
Description
Technical Field
The utility model relates to a technical field that transmission line detected especially relates to an intelligent starting point circuit insulation detection circuitry.
Background
When the power transmission line is subjected to projects such as extension, wiring change, migration and modification, line insulation measurement is used as the last pass of power transmission operation of the power transmission line, and if the measurement is unqualified, a power grid accident is caused. At present, the insulation detection of the power transmission line is carried out by utilizing an insulation resistance meter, the conversion connection mode is that an insulation operating rod is adopted to carry out switching with a lead, however, the switching mode has a plurality of problems:
firstly, a manual operating rod is needed to switch, so that the labor is consumed and the operation is complicated;
and secondly, the manual operating rod directly contacts the equipment, the manual operation is difficult to control due to the overlong operating rod, the adjacent electrified equipment is easy to touch, and the potential safety hazard of electric shock exists.
Disclosure of Invention
An object of the utility model is to overcome prior art not enough, the utility model provides an intelligent starting point circuit insulation detection circuit, through adopting the circuit insulation detection circuit control automatic high-pressure switch carries out the insulation measurement of each state, has greatly reduced insulation measurement's the degree of difficulty, has improved measurement operating efficiency, has reduced measurement risk and cost.
In order to solve the above problem, the utility model provides an intelligent starting point circuit insulation detection circuitry, detection circuitry includes: the relay switching device comprises a key pressure control module, a micro-processing control module, a relay driving module and a relay switching module, wherein the input end of the micro-processing control module is connected with the key pressure control module, the output end of the micro-processing control module is connected with the input end of the relay driving module, and the output end of the relay driving module is connected with the relay switching module.
The micro-processing control module is a microcontroller chip LZ1, the address end of the microcontroller chip LZ1 is connected with the output end of the key pressure control module, and the signal output end of the microcontroller chip LZ1 is connected with the input end of the relay drive module.
The key pressure control module comprises a voltage division circuit and an LC low-pass filter circuit, wherein:
the input end of the LC low-pass filter circuit is connected with the voltage division circuit, and the output end of the LC low-pass filter circuit is connected with the address end of the microcontroller chip LZ 1.
The voltage division circuit includes resistance R9, resistance R10, resistance R11, resistance R13, resistance R17 and resistance R20 that the series connection in proper order, the voltage division circuit passes through resistance R9's one end and 3.3V direct current power supply are connected, the voltage division circuit sets up resistance R20's one end ground connection.
The relay driving module is a relay driving chip U1, a signal input end of the relay driving chip U1 is connected with a signal output end of the microcontroller chip LZ1, and a signal output end of the relay driving chip U1 is connected with the relay switching module.
The relay switching module comprises a relay coil control unit and a relay electric loop, wherein:
the input end of the relay coil control unit is connected with the signal output end of the relay driving chip U1, the output end of the relay coil control unit is connected with a VIN direct-current power supply, and the electric loop of the relay is connected with three-phase voltage.
The relay switching module further comprises a relay state display unit, and the relay state display unit is connected with the input end of the relay coil control unit.
In the embodiment of the invention, the intelligent starting point circuit insulation detection circuit is provided with six states of insulation measurement corresponding to six keys, the voltage division circuit is used for defining information of the six keys, and the starting controller is used for controlling the state of the relay when the corresponding key is operated according to the measurement requirement, so that the measurement is carried out by switching to the corresponding wiring mode. Compare in traditional manpower drive insulating bar and carry out insulation measurement, greatly reduced insulation measurement's the degree of difficulty, improved measurement operating efficiency, reduced measurement risk and cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an intelligent starting point line insulation detection circuit in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a microprocessor control module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a key pressure control module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a relay driving module in an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a relay switching module in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an intelligent starting point line insulation detection circuit according to an embodiment of the present invention.
As shown in fig. 1, the principle of an intelligent starting point line insulation detection circuit includes: the relay switching device comprises a key pressure control module, a microprocessor control module, a relay driving module and a relay switching module, wherein the input end of the microprocessor control module is connected with the key pressure control module, the output end of the microprocessor control module is connected with the input end of the relay driving module, and the output end of the relay driving module is connected with the relay switching module.
In the specific implementation process, the key pressure control module corresponds to six states of insulation measurement, and controls the input end of the micro-processing control module to output corresponding control signals after data processing inside the micro-processing control module, the control signals are input into the input end of the relay driving module to output corresponding switching commands after information processing inside the relay driving module, the relay switching module is triggered to execute the corresponding switching commands, and the electronic insulation resistance meter performs corresponding insulation measurement according to the working state of the current relay switching module.
Based on the utility model discloses the principle of the insulating detection circuitry of intelligent starting point circuit that the embodiment relates to, figure 2 to figure 5 are right each module that relates constitutes and the function elaborates in the principle of detection circuitry.
Referring to fig. 2, fig. 2 is a schematic diagram of a structure of a microprocessor control module according to an embodiment of the present invention.
As shown in fig. 2, the microprocessor control module is a microcontroller chip LZ1, an address terminal of the microcontroller chip LZ1 is connected to an output terminal of the key pressure control module, and a signal output terminal of the microcontroller chip LZ1 is connected to an input terminal of the relay drive module.
Specifically, the microcontroller chip LZ1 adopts an STM32F103RB chip of a semiconductor of law meaning, a pin 18 of the chip is correspondingly connected with an output end of the key control module, and pins 9 to 14 are correspondingly connected with an input end of the relay driving module, wherein the pin 18 is defined as an a1 address end, and the pins 9 to 14 are respectively defined as RL _ B1, RL _ B2, RL _ B3, RL _ B4, RL _ B5 and RL _ B6.
And the microcontroller chip LZ1 performs data processing after detecting the voltage value of the A1 address end, and the RL _ B1, the RL _ B2, the RL _ B3, the RL _ B4, the RL _ B5 and the RL _ B6 acquire corresponding level information and control the relay driving module to work through the level information.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a key pressure control module in an embodiment of the present invention.
As shown in fig. 3, the key pressure control module includes a voltage divider circuit and an LC low-pass filter circuit, wherein an input terminal of the LC low-pass filter circuit is connected to the voltage divider circuit, and an output terminal of the LC low-pass filter circuit is connected to an address terminal of the microcontroller chip LZ 1.
The LC low-pass filter circuit comprises a filter resistor R12 and a filter capacitor C1, the first end of the filter capacitor C1 is connected with the first end of the filter resistor R12 and then is connected to the A1 address end of the microcontroller chip LZ1, the second end of the filter capacitor C1 is grounded, and the second end of the filter resistor R12 is connected with an A1 control signal.
It should be noted that, the first end of the discharge resistor R16 is connected to the a1 control signal, the second end of the discharge resistor R16 is grounded, when a certain key is pressed, the a1 control signal obtains a corresponding voltage value, when the certain key is released, the a1 control signal actually maintains the voltage value, the discharge resistor R16 is used for performing discharge processing, so that the a1 control signal is restored to 0, and it is ensured that the voltage value obtained by the a1 control signal is not affected when other keys are pressed.
When the LC low-pass filter circuit filters the a1 control signal, the a1 control signal is generated by pressing a button control voltage divider circuit, and the filter capacitor C therein plays a role in eliminating button jitter.
The voltage division circuit includes resistance R9, resistance R10, resistance R11, resistance R13, resistance R17 and resistance R20 that the series connection in proper order, the voltage division circuit passes through resistance R9's one end and 3.3V direct current power supply are connected, the voltage division circuit sets up resistance R20's one end ground connection.
The resistor R9 is connected with a 3.3V direct-current power supply and then connected with one end of a key K1, the resistor R9 is connected with the resistor R10 and then connected with one end of a key K2, the resistor R10 is connected with the resistor R11 and then connected with one end of a key K3, the resistor R11 is connected with the resistor R13 and then connected with one end of the key K4, the resistor R13 is connected with the resistor R17 and then connected with one end of a key K5, the resistor R17 is connected with the resistor R20 and then connected with one end of a key K6, and the other ends of the key K1, the key K2, the key K3, the key K4, the key K5 and the key K6 are connected in parallel and then connected with the A1 control signal.
Note that the key K1 represents measurement of BC and ground isolation by control a, the key K2 represents measurement of AC and ground isolation by control B, the key K3 represents measurement of AB and ground isolation by control C, the key K4 represents measurement of AB isolation, the key K5 represents measurement of BC isolation, and the key K6 represents measurement of CA isolation.
In a specific implementation process, based on the description of the microcontroller chip LZ1 shown in fig. 2, when any one key is pressed, the a1 control signal obtains a corresponding voltage value through a voltage dividing circuit, the voltage value is filtered by the LC low-pass filter circuit and then input to the a1 address terminal, the microcontroller chip LZ1 detects the voltage value at the a1 address terminal and then performs data processing, and outputs a corresponding RL _ B1 signal, a RL _ B2 signal, a RL _ B3 signal, a RL _ B4 signal, a RL _ B5 signal, and a RL _ B6 signal, where specific correspondence relationships are shown in table 1:
TABLE 1 data processing of microprocessor chip LZ1
| Push-button | Value of voltage | RL_B1 | RL_B2 | RL_B3 | RL_B4 | RL_B5 | RL_B6 |
| K1 | 3.3V | High level | High level | Low level of electricity | High level | Low level of electricity | Low level of electricity |
| K2 | 2.75V | High level | Low level of electricity | High level | Low level of electricity | High level | Low level of electricity |
| K3 | 2.2V | Low level of electricity | High level | High level | Low level of electricity | Low level of electricity | High level |
| K4 | 1.65V | Low level of electricity | High level | Low level of electricity | High level | Low level of electricity | Low level of electricity |
| K5 | 1.1V | High level | Low level of electricity | Low level of electricity | Low level of electricity | High level | Low level of electricity |
| K6 | 0.55V | Low level of electricity | Low level of electricity | High level | Low level of electricity | Low level of electricity | High level |
Referring to fig. 4, fig. 4 is a schematic structural diagram of a relay driving module in an embodiment of the present invention.
As shown in fig. 4, the relay driver module is a relay driver chip U1, a signal input terminal of the relay driver chip U1 is connected to a signal output terminal of the microcontroller chip LZ1, and a signal output terminal of the relay driver chip U1 is connected to the relay switching module.
Specifically, the relay driving chip U1 adopts an ULN2003 chip, pins 1 to 6 of the chip are correspondingly connected with pins 9 to 14 of the micro control chip LZ1, and pins 11 to 16 are correspondingly connected with the relay switching module, wherein the pins 1 to 6 are respectively defined as RL _ B1, RL _ B2, RL _ B3, RL _ B4, RL _ B5 and RL _ B6, and the pins 11 to 16 are respectively defined as RL _ C3, RL _ C2, RL _ C1, RL _ C4, RL _ C5 and RL _ C6.
It should be noted that when the input end of the relay driver chip U1 is at a low level, the output end is at a high level; when the input end of the relay driving chip U1 is at a high level, the output end is at a low level. The input end pin and the output end pin have a corresponding relation, wherein an RL _ B1 input signal is related to an RL _ C6 output signal, an RL _ B2 input signal is related to an RL _ C5 output signal, an RL _ B3 input signal is related to an RL _ C4 output signal, an RL _ B4 input signal is related to an RL _ C1 output signal, an RL _ B5 input signal is related to an RL _ C2 output signal, and an RL _ B6 input signal is related to an RL _ C3 output signal.
In the specific implementation process, referring to the information provided in table 1, when the key K1 is pressed, the level information of the corresponding signal output after the data processing of the relay driver chip U1 is: RL _ C1, RL _ C5, RL _ C6 are low, RL _ C2, RL _ C3, RL _ C4 are high;
when the key K2 is pressed, the level information of the corresponding signal output after the data processing of the relay driving chip U1 is as follows: RL _ C2, RL _ C4, RL _ C6 are low, RL _ C1, RL _ C3, RL _ C5 are high;
when the key K3 is pressed, the level information of the corresponding signal output after the data processing of the relay driving chip U1 is as follows: RL _ C3, RL _ C4, RL _ C5 are low, RL _ C1, RL _ C2, RL _ C6 are high;
when the key K4 is pressed, the level information of the corresponding signal output after the data processing of the relay driving chip U1 is as follows: RL _ C1, RL _ C5 are low, RL _ C2, RL _ C3, RL _ C4, RL _ C6 are high;
when the key K5 is pressed, the level information of the corresponding signal output after the data processing of the relay driving chip U1 is as follows: RL _ C2, RL _ C6 are low, RL _ C1, RL _ C3, RL _ C4, RL _ C5 are high;
when the key K6 is pressed, the level information of the corresponding signal output after the data processing of the relay driving chip U1 is as follows: RL _ C3, RL _ C4 are low, RL _ C1, RL _ C2, RL _ C5, RL _ C6 are high.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a relay driving module in an embodiment of the present invention.
As shown in fig. 5, the relay switching module includes a relay coil control unit and a relay electrical loop, an input end of the relay coil control unit is connected to a signal output end of the relay driver chip U1, an output end of the relay coil control unit is connected to a VIN direct-current power supply, and the relay electrical loop is connected to a three-phase voltage.
The relay coil control unit comprises a coil RL1A, a coil RL2A, a coil RL3A, a coil RL4A, a coil RL5A and a coil RL6A, wherein the first end of the coil RL1A is connected with a RL _ C1, the first end of the coil RL2A is connected with a RL _ C2, the first end of the coil RL3A is connected with a RL _ C3, the first end of the coil RL4A is connected with a RL _ C4, the first end of the coil RL5A is connected with a RL _ C5, the first end of the coil RL6A is connected with a RL _ C6, and the second ends of the coil RL1A, the coil RL2A, the coil RL3A, the coil RL4A, the coil RL5A and the coil RL6A are connected in parallel with a VIN direct current power supply.
The relay electric circuit comprises a switch RL1B, a switch RL2B, a switch RL3B, a switch RL4B, a switch RL5B, a switch RL6B, a current-limiting resistor R14, a current-limiting resistor R19 and a current-limiting resistor R23, wherein the first ends of the switch RL1B, the switch RL2B and the switch RL3B are connected with L, the first end of the switch RL4B is connected with E through the current-limiting resistor R14, the first end of the switch RL5B is connected with E through the current-limiting resistor R19, the first end of the switch RL6B is connected with E through the current-limiting resistor R23, the second ends of the switch RL1B and the switch RL4B are connected with a first phase voltage of three-phase voltages, the second ends of the switch RL2B and the switch RL5B are connected with a second phase voltage of the three-phase voltages, and the second ends of the switch RL3B and the switch RL6B are connected with a second phase voltage of the three-phase.
It should be noted that L is a high-voltage terminal of the electronic insulation resistance tester, and E is a ground terminal of the electronic insulation resistance tester.
The relay switching module further comprises a relay state display unit, and the relay state display unit is connected with the input end of the relay coil control unit.
The relay state display unit comprises a first current loop, a second current loop, a third current loop, a fourth current loop, a fifth current loop and a sixth current loop, wherein the first current loop is connected with an RL _ C1 signal, the second current loop is connected with an RL _ C2 signal, the third current loop is connected with an RL _ C3 signal, the fourth current loop is connected with an RL _ C4 signal, the fifth current loop is connected with an RL _ C5 signal, the sixth current loop is connected with an RL _ C6 signal, and the first current loop, the second current loop, the third current loop, the fourth current loop, the fifth current loop and the sixth current loop form a parallel circuit which is connected with a VIN direct-current power supply.
The first current loop comprises a current-limiting resistor R15 and a light-emitting diode D1 which are connected in series, one end of the current-limiting resistor R15 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D1 is connected with a RL _ C1 signal;
the second current loop comprises a current-limiting resistor R18 and a light-emitting diode D2 which are connected in series, one end of the current-limiting resistor R18 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D2 is connected with a RL _ C2 signal;
the third current loop comprises a current-limiting resistor R21 and a light-emitting diode D3 which are connected in series, one end of the current-limiting resistor R21 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D3 is connected with a RL _ C3 signal;
the fourth current loop comprises a current-limiting resistor R22 and a light-emitting diode D4 which are connected in series, one end of the current-limiting resistor R22 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D4 is connected with a RL _ C4 signal;
the fifth current loop comprises a current-limiting resistor R24 and a light-emitting diode D5 which are connected in series, one end of the current-limiting resistor R24 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D5 is connected with a RL _ C5 signal;
the sixth current loop comprises a current-limiting resistor R25 and a light-emitting diode D6 which are connected in series, one end of the current-limiting resistor R25 is connected with a VIN direct-current power supply, and one end of the light-emitting diode D6 is connected with a RL _ C6 signal.
In a specific implementation process, based on the specific implementation process described in fig. 4, when the key K1 is pressed, RL _ C1, RL _ C5, and RL _ C6 are at a low level, and trigger the corresponding light emitting diode D1, light emitting diode D5, and light emitting diode D6 to be in a light emitting state, at this time, a current passes through the corresponding coil RL1A, coil RL5A, and coil RL6A, pull in the corresponding switch RL1B, switch RL5B, and switch RL6B, and the electronic insulation resistance tester measures resistance values of insulation between a and BC and ground;
when the key K2 is pressed, RL _ C2, RL _ C4 and RL _ C6 are at low level, the corresponding light-emitting diode D2, the corresponding light-emitting diode D4 and the corresponding light-emitting diode D6 are triggered to be in a light-emitting state, at the moment, current passes through the corresponding coil RL2A, the corresponding coil RL4A and the corresponding coil RL6A, the corresponding switch RL2B, the corresponding switch RL4B and the corresponding switch RL6B are pulled in, and the electronic insulation resistance tester measures the resistance value of B pair of AC and ground insulation;
when the key K3 is pressed, RL _ C3, RL _ C4 and RL _ C5 are at low level, the corresponding light-emitting diode D3, the corresponding light-emitting diode D4 and the corresponding light-emitting diode D5 are triggered to be in a light-emitting state, at the moment, current passes through the corresponding coil RL3A, the corresponding coil RL4A and the corresponding coil RL5A, the corresponding switch RL3B, the corresponding switch RL4B and the corresponding switch RL5B are pulled in, and the electronic insulation resistance tester measures the resistance value of C to AB and ground insulation;
when the key K4 is pressed, RL _ C1 and RL _ C5 are at low level, the corresponding light-emitting diode D1 and the corresponding light-emitting diode D5 are triggered to be in a light-emitting state, at the moment, current passes through the corresponding coil RL1A and the corresponding coil RL5A, the corresponding switch RL1B and the corresponding switch RL5B are attracted, and the electronic insulation resistance tester measures the resistance value of AB insulation;
when the key K5 is pressed, RL _ C2 and RL _ C6 are at low level, the corresponding light-emitting diode D2 and the corresponding light-emitting diode D6 are triggered to be in a light-emitting state, at the moment, current passes through the corresponding coil RL2A and the corresponding coil RL6A, the corresponding switch RL2B and the corresponding switch RL6B are attracted, and the electronic insulation resistance tester measures the resistance value of BC insulation;
when the key K6 is pressed, RL _ C3 and RL _ C4 are at low level, the corresponding light-emitting diode D3 and the corresponding light-emitting diode D4 are triggered to be in a light-emitting state, at the moment, current passes through the corresponding coil RL3A and the corresponding coil RL4A, the corresponding switch RL3B and the corresponding switch RL4B are attracted, and the electronic insulation resistance tester measures the insulation resistance value of CA.
In the embodiment of the invention, the intelligent starting point circuit insulation detection circuit is provided with six states of insulation measurement corresponding to six keys, the voltage division circuit is used for defining information of the six keys, and the starting controller is used for controlling the state of the relay when the corresponding key is operated according to the measurement requirement, so that the measurement is carried out by switching to the corresponding wiring mode. Compare in traditional manpower drive insulating bar and carry out insulation measurement, greatly reduced insulation measurement's the degree of difficulty, improved measurement operating efficiency, reduced measurement risk and cost.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
The intelligent starting point line insulation detection circuit provided by the embodiment of the present invention is described in detail above, and the principle and the implementation of the present invention are explained by using specific examples herein, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (7)
1. An intelligent starting point line insulation detection circuit, the detection circuit comprising: the relay switching device comprises a key pressure control module, a micro-processing control module, a relay driving module and a relay switching module, wherein the input end of the micro-processing control module is connected with the key pressure control module, the output end of the micro-processing control module is connected with the input end of the relay driving module, and the output end of the relay driving module is connected with the relay switching module.
2. The intelligent starting point line insulation detection circuit as claimed in claim 1, wherein the microprocessor control module is a microcontroller chip LZ 1;
the address end of the microcontroller chip LZ1 is connected with the output end of the key pressure control module, and the signal output end of the microcontroller chip LZ1 is connected with the input end of the relay drive module.
3. The intelligent starting point line insulation detection circuit of claim 2, wherein the key pressure control module comprises a voltage divider circuit and an LC low-pass filter circuit, and wherein:
the input end of the LC low-pass filter circuit is connected with the voltage division circuit, and the output end of the LC low-pass filter circuit is connected with the address end of the microcontroller chip LZ 1.
4. The intelligent starting point line insulation detection circuit as claimed in claim 3, wherein the voltage divider circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R13, a resistor R17 and a resistor R20 which are connected in series in sequence, the voltage divider circuit is connected with a 3.3V DC power supply through one end of the resistor R9, and one end of the resistor R20 is connected to ground.
5. The intelligent starting point line insulation detection circuit as claimed in claim 2, wherein the relay driving module is a relay driving chip U1;
the signal input end of the relay driving chip U1 is connected with the signal output end of the microcontroller chip LZ1, and the signal output end of the relay driving chip U1 is connected with the relay switching module.
6. The intelligent starting point line insulation detection circuit of claim 5 wherein said relay switching module comprises a relay coil control unit, a relay electrical loop, wherein:
the input end of the relay coil control unit is connected with the signal output end of the relay driving chip U1, the output end of the relay coil control unit is connected with a VIN direct-current power supply, and the electric loop of the relay is connected with three-phase voltage.
7. The intelligent starting point line insulation detection circuit according to claim 6, wherein the relay switching module further comprises a relay state display unit, and the relay state display unit is connected with an input end of the relay coil control unit.
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| CN201921875671.7U CN211374931U (en) | 2019-11-01 | 2019-11-01 | Intelligent starting point line insulation detection circuit |
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| CN201921875671.7U CN211374931U (en) | 2019-11-01 | 2019-11-01 | Intelligent starting point line insulation detection circuit |
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