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Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit

A DC high voltage, detection method technology, applied in the direction of measuring electrical variables, voltage/current isolation, measuring current/voltage, etc., can solve the problems of complex structure and high production cost, and achieve the effect of simple structure and low production cost

Inactive Publication Date: 2012-10-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems that the existing DC high voltage detection method and detection circuit do not have good electrical isolation characteristics, complex structure and high production cost, the purpose of the present invention is to provide an isolated DC high voltage detection method and detection circuit with good electrical isolation performance , simple structure and low production cost

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  • Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit
  • Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit
  • Isolated direct current high voltage detection method and isolated direct current high voltage detection circuit

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Embodiment 1

[0028] Example one: such as figure 1 As shown, HV+ and HV- are the positive and negative poles of the measured DC high voltage, Vi is the input voltage of the photocoupler, and Vo is the output voltage signal. The photocoupler adopts TLP521-1; the resistor R2 is connected in parallel to the two input terminals 1, 2 of the photocoupler, and then connected in series with the high voltage isolation current limiting resistor R1, and then connected between the two high voltage electrodes to form a voltage divider circuit; photoelectric coupling The output pin 3 of the photocoupler is connected to the low voltage side ground Vss; the output pin 4 of the photocoupler is connected to the low voltage side power supply Vcc via a pull-up resistor R4; at the same time, the output pin 4 of the photocoupler is connected to the signal output end via a current limiting resistor R5; The output signal is connected to the low-voltage side ground Vss through the filter capacitor C1.

[0029] On th...

Embodiment 2

[0034] Embodiment two: such as figure 2 As shown, HV+ and HV- are the positive and negative poles of the measured DC high voltage, Vi is the input voltage of the photocoupler, and Vo is the output voltage signal. The photocoupler adopts 6N139; the resistor R2 is connected in parallel to the two input terminals 2 and 3 of the photocoupler, and then connected in series with the high voltage isolation current limiting resistor R1, and then connected between the two high voltage electrodes to form a voltage divider circuit; the output of the photocoupler Pin 5 of the photocoupler is connected to the low-voltage side ground Vss; pin 8 of the photocoupler power supply terminal is connected to the low-voltage side power supply Vcc via a pull-up resistor R3; pin 6 of the photocoupler output end is connected to the low-voltage side power supply Vcc via a pull-up resistor R4; The 6 pin of the output end of the coupler is connected to the signal output end through the current limiting resi...

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Abstract

The invention discloses an isolated direct current high voltage detection method and an isolated direct current high voltage detection circuit which aim at solving problems that the existing detection method and the existing detection circuit do not have good electric isolation characteristics, the structure is complex and production cost is high. According to the isolated direct current high voltage detection method and the isolated direct current high voltage detection circuit, a resistance voltage division circuit, a photoelectric coupler and a signal conditioning circuit used for conditioning detection signals form the isolated direct current high voltage detection circuit. On the basis that reliable detection of direct current high voltage is ensured, the method and the circuit can ensure good electric isolation performance on the high voltage side and the low voltage side, complexity of the detection circuit can be reduced, and accordingly production cost is saved.

Description

Technical field [0001] The invention relates to a direct current voltage detection, more specifically to an isolated DC high voltage detection method and a detection circuit. Background technique [0002] At present, a large number of devices are driven by DC high-voltage power supplies, and the normal operation of these devices is often carried out under the control of the control system. When the control system controls these devices, it needs to monitor the voltage of the high-voltage drive power supply that provides energy to the devices. When the high-voltage power supply voltage is within the normal range, the control system controls the normal operation of these devices. If the high-voltage power supply voltage is higher or lower than the normal range, the control system will stop the operation of the equipment and send out an alarm message. In this process, the DC high voltage detection method is very important for the reliable control of the control system. [0003] The ...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/22
Inventor 王振松刘晓云陈武凡
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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