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Detection circuit and method for total current of high-voltage cathode

A detection circuit, high-voltage current technology, applied in the direction of measuring current/voltage, only measuring current, measuring devices, etc., can solve the problems of insufficient insulation withstand voltage of current transformers, difficult sampling, and low sampling accuracy

Pending Publication Date: 2021-05-18
重庆两江卫星移动通信有限公司
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AI Technical Summary

Problems solved by technology

Due to control requirements, it is usually necessary to collect the current at the high-voltage output terminal, such as the total cathode current of a high-voltage output power supply. However, current detection for high-voltage output occasions usually has sampling difficulties, insufficient insulation withstand voltage of the primary and secondary of the current transformer, and low sampling accuracy. A series of problems, currently there is no relevant technology that can sample the current at the high-voltage output terminal, especially the sampling technology for the total output cathode current of a high-voltage power supply
[0003] The current detection methods proposed in the prior art are all low-voltage current sampling circuits, which are only suitable for low-voltage output occasions, and can only sample single-ended current output. For occasions of several thousand volts, even tens of kilovolts or higher Not applicable at all, let alone sampling the total current of the high voltage cathode

Method used

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  • Detection circuit and method for total current of high-voltage cathode

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Embodiment 1

[0026] Such as figure 1 As shown, in this embodiment, a detection circuit of a high-voltage cathode total current includes a cathode high-voltage output unit, a cathode total current sampling unit, and a sampling signal follower unit connected in sequence;

[0027] The primary side N0 of the high-voltage transformer T1 in the cathode high-voltage output unit inputs the cathode voltage, and the secondary side of the high-voltage transformer T1 includes three independent windings N1, N2...Nn;

[0028] The first end of the winding N2 on the secondary side of the high-voltage transformer T1 is respectively connected to the anode of the first secondary rectification diode D1 and the cathode of the second secondary rectification diode D2, and the second end of the winding is respectively connected to the first output filter capacitor C1 The first end and the first end of the second output filter capacitor C2, the cathode of the first secondary rectifier diode D1 is connected to the ...

Embodiment 2

[0036] A detection method of high-voltage cathode total current, applied on the basis of embodiment 1:

[0037] Cathode high voltage output unit:

[0038] The cathode voltage -9kV is input through the primary side N0 of the high-voltage transformer T1, and the windings N1, N2...Nn on the secondary side of the high-voltage transformer T1 are cascaded to realize multiple high-voltage outputs (collector-1, collector-2...collector- 3), the rectified output voltage of the windings N1, N2...Nn is between 0.7kV-1kV, and the value of n in this embodiment is between 9-13; the output loads R1, R2, Rn of the windings N1, N2...Nn The common ends of the windings are all connected to the cathode, and the current loops output by the windings N1, N2...Nn all need to pass through the primary winding N1, and the current of the primary winding N1 is equal to the total current of the entire cathode;

[0039] Cathode total current sampling unit:

[0040] The primary side of the high-voltage curr...

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Abstract

The invention discloses a detection circuit and method for a total current of a high-voltage cathode. The detection circuit comprises a cathode high-voltage output unit, a cathode total current sampling unit and a sampling signal following unit which are connected in sequence. The detection method comprises the steps that a cathode voltage is input through a primary side of a high-voltage transformer, multiple windings of a secondary side of the high-voltage transformer achieve multi-path high-voltage output in a cascade connection mode, the output load common end of each winding is connected to a cathode, and the current of the primary winding is equal to the total current of the whole cathode; the primary side of the high-voltage current transformer is connected in series with the primary winding of the secondary side of the high-voltage transformer; the primary side current of the high-voltage current transformer is equal to the total current of the whole cathode; the secondary side of the high-voltage current transformer is rectified through a diode bridge rectifier, and then the average value of the cathode total current is collected through an RC filter circuit; and an operational amplifier of a sampling signal following unit changes the low impedance characteristic of the sampling output signal into the high impedance characteristic of the output current signal.

Description

technical field [0001] The invention relates to a current detection circuit, in particular to a detection circuit and method for a high-voltage cathode total current. Background technique [0002] In high-voltage output applications, such as radar power supplies, laser power supplies, high-voltage ozone power supplies, etc., the output voltage is usually several thousand volts, or even tens of kilovolts or higher. Due to control requirements, it is usually necessary to collect the current at the high-voltage output terminal, such as the total cathode current of a high-voltage output power supply. However, current detection for high-voltage output occasions usually has sampling difficulties, insufficient insulation withstand voltage of the primary and secondary of the current transformer, and low sampling accuracy. A series of problems, currently there is no relevant technology capable of sampling the current at the high-voltage output terminal, especially the sampling techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 杨明生张林刘明凯曾卓赵海峰
Owner 重庆两江卫星移动通信有限公司
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