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A passive lossless high-frequency magnetic isolation type DC voltage detection circuit

A DC voltage and detection circuit technology, applied in the direction of measuring current/voltage, voltage/current isolation, measuring devices, etc., can solve problems such as the complexity of the rectifier diode voltage drop compensation circuit, and achieve low cost, simple measurement circuit, and small size Effect

Active Publication Date: 2017-10-17
WOLONG ELECTRIC GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent 201310288268.5 proposes a DC voltage isolation sampling circuit, but the primary side and secondary side of the transformer of this circuit have operational amplifiers, which need separate power supply, and the rectifier diode voltage drop compensation circuit is complex
To sum up, the existing magnetic isolation DC voltage detection circuit needs a separate power supply and the rectifier diode voltage drop compensation circuit is complex.

Method used

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  • A passive lossless high-frequency magnetic isolation type DC voltage detection circuit
  • A passive lossless high-frequency magnetic isolation type DC voltage detection circuit
  • A passive lossless high-frequency magnetic isolation type DC voltage detection circuit

Examples

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Effect test

Embodiment 1

[0023] The invention includes an input voltage 1, a high-frequency inverter circuit 2, a high-frequency transformer 3, a self-compensating high-frequency rectification circuit 4, an output voltage 5, a control and drive circuit 6 and a power supply circuit 7. The specific connection relationship is: figure 1 Among them, the power supply circuit 7 directly takes power from the input voltage 1 to provide power for the control and drive circuit 6 . The control and drive circuit 6 outputs drive pulses to directly drive the high-frequency inverter circuit 2; the high-frequency inverter circuit 2 inverts the input voltage 1 and outputs a high-frequency AC signal, which is transmitted to the self-compensating high-frequency inverter through the high-frequency transformer 3 The rectification circuit 4, the self-compensating high-frequency rectification circuit 4 transforms the high-frequency AC signal into a DC signal, and at the same time realizes the self-compensation of the voltage...

Embodiment 2

[0030] The same as Embodiment 1 will not be repeated, the difference is: when this embodiment is used, except for the high-frequency transformer T 32 With the high frequency transformer T of Example 1 31 different, the rest of the structure and connections are the same.

[0031] High frequency transformer T 32 There are two taps on the primary side, which are W P21 and W P22 , the primary winding is electrically connected to the two terminals of the high-frequency inverter circuit 2 in turn, and the connection relationship is: W P21 Connect to P 1 , W P22 Connect to P 2 . High frequency transformer T 32 The secondary side is two windings with the same number of turns, and the four taps are respectively W S21 , W S22 , W S23 and W S24 , where W S22 and W S23 A direct connection forms the center tap. The three taps of the secondary winding are then electrically connected to the three terminals of the self-compensating high-frequency rectification circuit 4 in turn...

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Abstract

A passive and non-destructive high-frequency magnetic isolation DC voltage detection circuit relates to the field of DC voltage measurement. The existing magnetic isolation type DC voltage detection circuit needs a separate power supply and has the disadvantages of complicating the voltage drop compensation circuit of the rectifier diode. The invention includes an input voltage terminal, a high-frequency inverter circuit, a high-frequency transformer, a self-compensating high-frequency rectifier circuit, an output voltage terminal, a control and drive circuit, and a power supply circuit; the power supply circuit is connected to the input voltage terminal to provide electric energy for the control and drive circuit The control and drive circuit is connected with the high-frequency inverter circuit, and the control and drive circuit outputs drive pulses to directly drive the high-frequency inverter circuit; the high-frequency inverter circuit is connected with the input voltage terminal. The technical solution does not require separate power supply and high-grade components and can realize self-compensation for rectifying diode voltage drop, and has the advantages of simple circuit structure, high measurement accuracy, low cost and small volume of high-frequency transformer.

Description

technical field [0001] The invention relates to the field of DC voltage measurement, in particular to a passive, non-destructive, high-frequency magnetic isolation type DC voltage detection circuit. Background technique [0002] Existing isolated DC voltage detection circuits are mainly based on Hall voltage sensors and optocouplers. The Hall voltage sensor is widely used, but the cost is high and requires a separate power supply; the cost of the optocoupler is high, and the measurement accuracy is low due to the nonlinearity of the optocoupler, and a separate power supply is also required. [0003] Magnetic isolation is the most commonly used electrical isolation method, but it is mainly used in AC applications. When magnetic isolation is applied to DC applications, it is necessary to convert the DC input signal into an AC signal that can be transmitted by the transformer, and then rectify it to obtain a DC output signal. The rectification part has a conduction voltage dro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/14
Inventor 陈申张明玮尹涛张卡飞葛文涛林伟杰冯芬季似宣廉晨龙
Owner WOLONG ELECTRIC GRP CO LTD
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