CN216285485U - Insulation resistance measuring circuit - Google Patents
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- CN216285485U CN216285485U CN202120693400.0U CN202120693400U CN216285485U CN 216285485 U CN216285485 U CN 216285485U CN 202120693400 U CN202120693400 U CN 202120693400U CN 216285485 U CN216285485 U CN 216285485U
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Abstract
The utility model discloses an insulation resistance measuring circuit, which comprises a voltage stabilizing circuit, a multivibrator, a voltage doubling rectifying circuit and a resistance measuring loop, wherein the voltage stabilizing circuit is connected with the multivibrator; the output end of the voltage stabilizing circuit is connected with the input end of the multivibrator and is used for supplying power to the multivibrator to cause the self-oscillation of the oscillator; the output end of the multivibrator is connected with the input end of the transformer and used for providing low-voltage pulses to the transformer and obtaining a preset voltage value through the transformer; the output end of the transformer is connected with the input end of the voltage doubling rectifying circuit, so that high-voltage direct current is obtained; the output end of the voltage doubling rectifying circuit is connected with the resistance measuring loop and used for providing a measuring power supply for the resistance measuring loop. The insulation resistance measuring circuit is ingenious in design and high in practicability.
Description
Technical Field
The utility model relates to the field of electricity, in particular to an insulation resistance measuring circuit.
Background
Rotor insulation measurement is a work which needs to be carried out before a new unit or a unit is started up after overhaul, minor overhaul or over-long shutdown time, so that the generator is ensured to be normally insulated, and the later operation is not influenced. Generators different from other generator sets are installed indoors, and wind generating sets are generally installed outdoors in areas with rich wind power resources, so that measurement of insulation resistance of rotors of general wind power generators requires workers to hold megameters to measure the insulation resistance of the rotors, manpower and material resources are wasted, and convenience and inconvenience are brought.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems, the utility model provides an insulation resistance measuring circuit which can be arranged at a generator and used for uploading analog quantity to a main control room, so that the rotor insulation measurement of a wind generating set is convenient to measure.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an insulation resistance measuring circuit comprises a voltage stabilizing circuit, a multivibrator, a voltage doubling rectifying circuit and a resistance measuring loop;
the output end of the voltage stabilizing circuit is connected with the input end of the multivibrator and is used for supplying power to the multivibrator to cause the self-oscillation of the oscillator;
the output end of the multivibrator is connected with the input end of the transformer and used for providing low-voltage pulses to the transformer and obtaining a preset voltage value through the transformer;
the output end of the transformer is connected with the input end of the voltage doubling rectifying circuit, so that high-voltage direct current is obtained;
the output end of the voltage doubling rectifying circuit is connected with the resistance measuring loop and used for providing a measuring power supply for the resistance measuring loop, so that the resistance measuring loop can work normally, and a resistance value to be measured is obtained.
According to the further technical scheme, the voltage stabilizing circuit comprises a voltage stabilizing chip IC1, a pin 1 and a pin 2 of a voltage stabilizing chip IC1 are connected with a direct-current power supply, the pin 2 is grounded, and a first capacitor C1 is connected between the pin 1 and the pin 2 to play a role in smoothing ripples and inhibiting instantaneous interference; a second capacitor C2 is connected between pin 2 and pin 3 of the voltage regulator chip IC1 for filtering, and pin 2 and pin 3 are connected to the input of the multivibrator.
In a further technical scheme, the multivibrator comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a first triode Q1 and a second triode Q2; one end of the first resistor R1, one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are all connected with the output end of the voltage stabilizing circuit, and the other end of the first resistor R1 is connected with one end of the third capacitor C3, the collector of the first triode Q1 and the input end of the transformer T1; the other end of the second resistor R2 is connected with the other end of the third capacitor C3 and the base electrode of the second triode Q2; the other end of the third resistor R3 is connected with one end of a fourth capacitor C4 and the base electrode of a first triode Q1; the other end of the fourth resistor R4 is connected with the other end of the fourth capacitor C4, the collector of the Q2 and the input end of the transformer T1; the emitter of the first triode Q1 and the emitter of the second triode Q2 are commonly grounded; the resistor is used for controlling and adjusting the frequency of oscillation; the capacitor controls the conduction and the cut-off of the two triodes through charging and discharging, thereby forming regular low-voltage pulse.
According to a further technical scheme, the voltage doubling rectifying circuit comprises a plurality of diodes, a plurality of capacitors, a plurality of voltage stabilizing tubes, a filter capacitor and a current limiting resistor; the diodes are connected in parallel, a capacitor is connected between adjacent diodes, the diode at any end part is connected with the capacitor in series, and the capacitor is connected with the output end of the transformer; the multiple of the voltage-multiplying rectifying circuit depends on the number of diodes and capacitors in the actual circuit; the filter capacitor is connected with the diodes at the two ends in parallel, and the voltage stabilizing tubes and the current limiting resistor are connected in series in sequence and then connected with the diodes at the two ends in parallel; the number of the voltage-stabilizing tubes depends on the selection of the voltage-stabilizing voltage value and the size of the voltage-stabilizing tubes required in the actual circuit.
In a further technical scheme, the voltage-doubling rectifying circuit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a twelfth diode D10, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a first voltage regulator D11, a second voltage regulator D12, a third voltage regulator D13, and a resistor current-limiting R5; one end of a fifth capacitor C5 is connected with the output end of the transformer T1, and the other end is connected with the cathode of the first diode D1, the anode of the second diode D2 and one end of a seventh capacitor C7; the other end of the seventh capacitor C7 is connected to the cathode of the third diode D3, the anode of the fourth diode D4, and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5, the anode of the sixth diode D6 and one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is connected to the cathode of the seventh diode D7, the anode of the eighth diode D8, and one end of the thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the cathode of the ninth diode D9 and the anode of the twelfth diode D10; the anode of the first diode D1 is connected with the output end of the transformer T1 and one end of the sixth capacitor C6; the other end of the sixth capacitor C6 is connected to the cathode of the second diode D2, the anode of the third diode D3, and one end of the eighth capacitor C8; the other end of the eighth capacitor C8 is connected to the cathode of the fourth diode D4, the anode of the fifth diode D5, and one end of the tenth capacitor C10; the other end of the tenth capacitor C10 is connected to the cathode of the sixth diode D6, the anode of the seventh diode D7, and one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the cathode of the eighth diode D8, the anode of the ninth diode D9, and one end of the fourteenth capacitor C14; the other end of the fourteenth capacitor C14 is connected to the cathode of the twelfth diode D10, and the two ends of the fifteenth capacitor C15 are connected to the anode of the first diode D1 and the cathode of the twelfth diode D10, respectively; the anode of the first voltage regulator tube D11 is connected with the anode of a first diode D1; the negative electrode of the first voltage-regulator tube D11 is connected with the positive electrode of the second voltage-regulator tube D12, the negative electrode of the second voltage-regulator tube D12 is connected with the positive electrode of the third voltage-regulator tube D13, and the negative electrode of the third voltage-regulator tube D13 is connected with one end of a current-limiting resistor R5; the other end of the current limiting resistor R5 is connected to the cathode of the twelfth diode D10.
In a further technical scheme, the resistance measurement circuit comprises a sixth fixed-value resistor R6, a seventh fixed-value resistor R7, an eighth fixed-value resistor R8, a ninth fixed-value resistor R9 and an insulation resistor Rx to be measured; one end of the sixth fixed-value resistor R6 is grounded; the other end of the resistor is connected with the voltage-regulated current circuit and one end of the insulation resistor Rx to be tested; the other end of the to-be-tested insulation resistor Rx is connected with one end of the eighth fixed-value resistor R8; the other end of the eighth fixed-value resistor R8 is connected with one end of the ninth fixed-value resistor R9; the other end of the ninth fixed-value resistor R9 is connected to the voltage-controlled rectifier circuit and one end of the seventh fixed-value resistor R7, and the other end of the seventh fixed-value resistor R7 is grounded.
According to the further technical scheme, the resistance value of the insulation resistor Rx to be measured is calculated according to the following formula:
wherein, U1Is the output voltage of the voltage doubling rectifying circuit, U2Is R8And R9And ground voltage between them.
Advantageous effects
1. According to the insulation resistance measuring circuit, the voltage stabilizing circuit, the multivibrator, the voltage doubling rectifying circuit and the voltage stabilizing circuit are adopted to obtain high-voltage direct current from low-voltage direct current, the low-voltage direct current is easy to obtain, the insulation requirement is low, and the cost can be reduced; the resistance measurement loop is simple and has high precision.
2. The utility model has the advantages of ingenious design and strong practicability.
Drawings
FIG. 1 is a functional block diagram of an insulation resistance measurement circuit;
FIG. 2 is a circuit diagram of an insulation resistance measurement circuit;
FIG. 3 is a diagram of a voltage regulator circuit;
FIG. 4 is a resistance measurement circuit diagram;
FIG. 5 is a circuit diagram of a multivibrator;
fig. 6 is a voltage doubler rectifier circuit diagram in an embodiment.
Detailed Description
In the future, the technical purpose and technical scheme of the utility model will be more clear, and the utility model will be further described in detail with reference to the accompanying drawings and practical cases.
As shown in fig. 1, an insulation resistance measuring circuit includes a voltage stabilizing circuit, a multivibrator, a voltage doubling rectifying circuit, and a resistance measuring circuit;
the output end of the voltage stabilizing circuit is connected with the input end of the multivibrator and is used for supplying power to the multivibrator to cause the self-oscillation of the oscillator;
the output end of the multivibrator is connected with the input end of the transformer and used for providing low-voltage pulses to the transformer and obtaining a preset voltage value through the transformer;
the output end of the transformer is connected with the input end of the voltage doubling rectifying circuit, so that high-voltage direct current is obtained;
the output end of the voltage doubling rectifying circuit is connected with the resistance measuring loop and used for providing a measuring power supply for the resistance measuring loop, so that the resistance measuring loop can work normally, and a resistance value to be measured is obtained.
As shown in fig. 2-6, the voltage regulator circuit includes a voltage regulator chip IC1, pin 1 and pin 2 of the voltage regulator chip IC1 are connected to a dc power supply, pin 2 is grounded, and a first capacitor C1 is connected between pin 1 and pin 2, so as to smooth ripples and suppress transient interference; a second capacitor C2 is connected between pin 2 and pin 3 of the voltage regulator chip IC1 for filtering, and pin 2 and pin 3 are connected to the input of the multivibrator. The low-voltage direct current stabilizes the output voltage to the voltage required by the multivibrator through the voltage stabilizing chip; the input end capacitor is used for weakening the influence of a load on a power supply, and the output end capacitor is used for filtering.
The multivibrator comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a first triode Q1 and a second triode Q2; one end of a first resistor R1, one end of a second resistor R2, one end of a third resistor R3 and one end of a fourth resistor R4 are all connected with a pin 3 of a voltage stabilizing chip IC1, and the other end of a first resistor R1 is connected with one end of a third capacitor C3, a collector of a first triode Q1 and a pin 10 of a transformer T1; the other end of the second resistor R2 is connected with the other end of the third capacitor C3 and the base electrode of the second triode Q2; the other end of the third resistor R3 is connected with one end of a fourth capacitor C4 and the base electrode of a first triode Q1; the other end of the fourth resistor R4 is connected with the other end of the fourth capacitor C4, the collector of Q2 and a pin 9 of a transformer T1; the emitter of the first triode Q1 and the emitter of the second triode Q2 are commonly grounded; the resistor is used for controlling and adjusting the frequency of oscillation; the capacitor controls the conduction and the cut-off of the two triodes through charging and discharging, thereby forming regular low-voltage pulse.
The multivibrator has two working states, in one state, Q1 is on, the collector voltage of Q1 is close to 0V, C3 is discharged by the current flowing through the collector and emitter of R2 and Q1, Q2 is turned off because the capacitor C3 provides a reverse voltage, C4 is charged via the collector and emitter of R4 and Q1, and the output voltage is high (but slightly lower than the power supply voltage because C2 is charged via R4). This state continues until the C3 discharge is complete. Since R2 provides base bias to turn on Q2, the circuit enters state two, Q2 is on, the collector voltage (i.e., output voltage) of Q2 changes from high to near 0V, Q1 is momentarily turned off due to the counter voltage provided by capacitor C4, Q1 is turned off, so that the collector voltage of Q1 rises to high, C1 charges via the bases and emitters of R1 and Q2, C4 discharges current flowing through R3 and Q2 collectors and emitters, and Q1 is turned off due to the counter voltage provided by capacitor C4. This state continues until C4 is discharged, and Q1 turns on because R3 provides a bias voltage to the base of Q1: the circuit enters state one. The above steps are repeated in a circulating way to form low-voltage pulse, and the low-voltage pulse is converted into high-voltage pulse through a transformer.
The voltage doubling rectifying circuit comprises a plurality of diodes, a plurality of capacitors, a plurality of voltage stabilizing tubes, a filter capacitor and a current limiting resistor; the diodes are connected in parallel, a capacitor is connected between adjacent diodes, the diode at any end part is connected with the capacitor in series, and the capacitor is connected with the output end of the transformer; the multiple of the voltage-multiplying rectifying circuit depends on the number of diodes and capacitors in the actual circuit; the filter capacitor is connected with the diodes at the two ends in parallel; a plurality of voltage-stabilizing tubes and current-limiting resistors are connected in series in sequence and then connected in parallel with diodes positioned at two ends; the number of the voltage-stabilizing tubes depends on the selection of the voltage-stabilizing voltage value and the size of the voltage-stabilizing tubes required in the actual circuit.
Specifically, as shown in fig. 2 and fig. 6, the voltage-doubling rectifying circuit includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a twelfth diode D10, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a first voltage regulator D11, a second voltage regulator D12, a third voltage regulator D13, and a current-limiting resistor R5; one end of a fifth capacitor C5 is connected with pin 3 of the transformer T1, and the other end is connected with the cathode of the first diode D1, the anode of the second diode D2, and one end of a seventh capacitor C7; the other end of the seventh capacitor C7 is connected to the cathode of the third diode D3, the anode of the fourth diode D4, and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5, the anode of the sixth diode D6 and one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is connected to the cathode of the seventh diode D7, the anode of the eighth diode D8, and one end of the thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the cathode of the ninth diode D9 and the anode of the twelfth diode D10; the positive electrode of the first diode D1 is connected with the 4 pin of the transformer T1 and one end of a sixth capacitor C6; the other end of the sixth capacitor C6 is connected to the cathode of the second diode D2, the anode of the third diode D3, and one end of the eighth capacitor C8; the other end of the eighth capacitor C8 is connected to the cathode of the fourth diode D4, the anode of the fifth diode D5, and one end of the tenth capacitor C10; the other end of the tenth capacitor C10 is connected to the cathode of the sixth diode D6, the anode of the seventh diode D7, and one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the cathode of the eighth diode D8, the anode of the ninth diode D9, and one end of the fourteenth capacitor C14; the other end of the fourteenth capacitor C14 is connected to the cathode of the twelfth diode D10, and the two ends of the fifteenth capacitor C15 are connected to the anode of the first diode D1 and the cathode of the twelfth diode D10, respectively; the anode of the first voltage regulator tube D11 is connected with the anode of a first diode D1; the negative electrode of the first voltage-regulator tube D11 is connected with the positive electrode of the second voltage-regulator tube D12, the negative electrode of the second voltage-regulator tube D12 is connected with the positive electrode of the third voltage-regulator tube D13, and the negative electrode of the third voltage-regulator tube D13 is connected with one end of a current-limiting resistor R5; the other end of the current limiting resistor R5 is connected to the cathode of the twelfth diode D10.
As the alternating current changes direction, voltage is accumulated by charging and discharging of the capacitor. When the secondary output of the transformer is up positive and down negative, the transformer charges three capacitors of the upper arm to store energy. When the output of the secondary of the transformer is positive, negative and negative, the upper arm capacitor is charged to the lower arm through the secondary of the transformer, and the cycle is repeated. The high voltage dc obtained by charging and discharging the capacitor is not very stable yet, so filtering and voltage stabilization are required. Therefore, the high-voltage direct-current power supply required by the measuring loop can be obtained according to the circuit.
The resistance measurement loop comprises a sixth fixed-value resistor R6, a seventh fixed-value resistor R7, an eighth fixed-value resistor R8, a ninth fixed-value resistor R9 and an insulation resistor Rx to be measured; one end of the sixth fixed-value resistor R6 is grounded; the other end of the first diode is connected to the negative electrode of a twelfth pole tube D10 and one end of an insulation resistor Rx to be tested; the other end of the to-be-tested insulation resistor Rx is connected with one end of the eighth fixed-value resistor R8; the other end of the eighth fixed-value resistor R8 is connected with one end of the ninth fixed-value resistor R9; the other end of the ninth fixed resistor R9 is connected to the anode of the first diode D1 and one end of the seventh fixed resistor R7, and the other end of the seventh fixed resistor R7 is grounded.
For circuit balance, higher accuracy, R6·R7＝R8·R9For convenience of calculation, R is taken in the circuit6＝R8、R7＝R9,U1Is the output voltage of the voltage doubling rectifying circuit, U2Is R8And R9The voltage between the two electrodes is relative to the ground voltage, and the following can be obtained from the figure:
in practical application, U can be connected with transmitter2And transmitting the voltage to a main control room, and calculating the insulation resistance value according to a formula.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.
Claims (7)
1. An insulation resistance measuring circuit is characterized by comprising a voltage stabilizing circuit, a multivibrator, a voltage doubling rectifying circuit and a resistance measuring loop;
the output end of the voltage stabilizing circuit is connected with the input end of the multivibrator and is used for supplying power to the multivibrator to cause the self-oscillation of the oscillator;
the output end of the multivibrator is connected with the input end of the transformer and used for providing low-voltage pulses to the transformer and obtaining a preset voltage value through the transformer;
the output end of the transformer is connected with the input end of the voltage doubling rectifying circuit, so that high-voltage direct current is obtained;
the output end of the voltage doubling rectifying circuit is connected with the resistance measuring loop and used for providing a measuring power supply for the resistance measuring loop, so that the resistance measuring loop can work normally, and a resistance value to be measured is obtained.
2. The insulation resistance measuring circuit according to claim 1, wherein the voltage regulator circuit comprises a voltage regulator chip IC1, pin 1 and pin 2 of the voltage regulator chip IC1 are connected with a direct current power supply, pin 2 is connected with ground, and a first capacitor C1 is connected between pin 1 and pin 2 to smooth ripples and suppress transient interference; a second capacitor C2 is connected between pin 2 and pin 3 of the voltage regulator chip IC1 for filtering, and pin 3 is connected to the input of the multivibrator.
3. The insulation resistance measurement circuit of claim 1, wherein the multivibrator includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a first transistor Q1, a second transistor Q2; one end of the first resistor R1, one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are all connected with the output end of the voltage stabilizing circuit, and the other end of the first resistor R1 is connected with one end of the third capacitor C3, the collector of the first triode Q1 and the input end of the transformer T1; the other end of the second resistor R2 is connected with the other end of the third capacitor C3 and the base electrode of the second triode Q2; the other end of the third resistor R3 is connected with one end of a fourth capacitor C4 and the base electrode of a first triode Q1; the other end of the fourth resistor R4 is connected with the other end of the fourth capacitor C4, the collector of the Q2 and the input end of the transformer T1; the emitter of the first transistor Q1 and the emitter of the second transistor Q2 are commonly connected to ground.
4. The insulation resistance measuring circuit according to claim 1, wherein the voltage doubling rectifying circuit comprises a plurality of diodes, a plurality of capacitors, a plurality of voltage-regulator tubes, a filter capacitor and a current limiting resistor; the diodes are connected in parallel, a capacitor is connected between adjacent diodes, the diode at any end part is connected with the capacitor in series, and the capacitor is connected with the output end of the transformer; the filter capacitor is connected with the diodes at two ends in parallel, and the voltage-stabilizing tubes and the current-limiting resistor are connected in series in sequence and then connected with the diodes at two ends in parallel.
5. The insulation resistance measurement circuit according to claim 4, wherein the voltage doubling rectifying circuit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a twelfth diode D10, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a first diode D11, a second diode D12, a third diode D13, a current limiting resistor R5; one end of a fifth capacitor C5 is connected with the output end of the transformer T1, and the other end is connected with the cathode of the first diode D1, the anode of the second diode D2 and one end of a seventh capacitor C7; the other end of the seventh capacitor C7 is connected to the cathode of the third diode D3, the anode of the fourth diode D4, and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 is connected to the cathode of the fifth diode D5, the anode of the sixth diode D6 and one end of the eleventh capacitor C11; the other end of the eleventh capacitor C11 is connected to the cathode of the seventh diode D7, the anode of the eighth diode D8, and one end of the thirteenth capacitor C13; the other end of the thirteenth capacitor C13 is connected to the cathode of the ninth diode D9 and the anode of the twelfth diode D10; the anode of the first diode D1 is connected with the output end of the transformer T1 and one end of the sixth capacitor C6; the other end of the sixth capacitor C6 is connected to the cathode of the second diode D2, the anode of the third diode D3, and one end of the eighth capacitor C8; the other end of the eighth capacitor C8 is connected to the cathode of the fourth diode D4, the anode of the fifth diode D5, and one end of the tenth capacitor C10; the other end of the tenth capacitor C10 is connected to the cathode of the sixth diode D6, the anode of the seventh diode D7, and one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 is connected to the cathode of the eighth diode D8, the anode of the ninth diode D9, and one end of the fourteenth capacitor C14; the other end of the fourteenth capacitor C14 is connected to the cathode of the twelfth diode D10, and the two ends of the fifteenth capacitor C15 are connected to the anode of the first diode D1 and the cathode of the twelfth diode D10, respectively; the anode of the first voltage regulator tube D11 is connected with the anode of a first diode D1; the negative electrode of the first voltage-regulator tube D11 is connected with the positive electrode of the second voltage-regulator tube D12, the negative electrode of the second voltage-regulator tube D12 is connected with the positive electrode of the third voltage-regulator tube D13, and the negative electrode of the third voltage-regulator tube D13 is connected with one end of a current-limiting resistor R5; the other end of the current limiting resistor R5 is connected to the cathode of the twelfth diode D10.
6. The insulation resistance measurement circuit according to claim 1, wherein the resistance measurement circuit comprises a sixth fixed-value resistor R6, a seventh fixed-value resistor R7, an eighth fixed-value resistor R8, a ninth fixed-value resistor R9, an insulation resistance Rx to be measured; one end of the sixth fixed-value resistor R6 is grounded; the other end of the resistor is connected with the voltage-regulated current circuit and one end of the insulation resistor Rx to be tested; the other end of the to-be-tested insulation resistor Rx is connected with one end of the eighth fixed-value resistor R8; the other end of the eighth fixed-value resistor R8 is connected with one end of the ninth fixed-value resistor R9; the other end of the ninth fixed-value resistor R9 is connected to the voltage-controlled rectifier circuit and one end of the seventh fixed-value resistor R7, and the other end of the seventh fixed-value resistor R7 is grounded.
7. The insulation resistance measuring circuit according to claim 6, wherein the resistance value of the insulation resistance Rx to be measured is calculated according to the following formula:
wherein, U1For voltage-doubling rectificationOutput voltage of the circuit, U2Is R8And R9And ground voltage between them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120693400.0U CN216285485U (en) | 2021-04-06 | 2021-04-06 | Insulation resistance measuring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120693400.0U CN216285485U (en) | 2021-04-06 | 2021-04-06 | Insulation resistance measuring circuit |
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| CN216285485U true CN216285485U (en) | 2022-04-12 |
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