Input-output common ground based high-voltage adjustable step-down circuit

A step-down circuit, high-voltage technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, and output power conversion devices, etc. High-power circuits, poor load adjustment performance, etc., to achieve the effect of powerful multiple protection functions, good load effect, and strong load capacity

Inactive Publication Date: 2016-09-07
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the RC step-down power supply is that the circuit efficiency is low, it cannot be used in high-power circuits, and it is not suitable for capacitive and inductive loads, esp

Method used

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  • Input-output common ground based high-voltage adjustable step-down circuit
  • Input-output common ground based high-voltage adjustable step-down circuit

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Embodiment Construction

[0014] Below in conjunction with the accompanying drawings, the embodiment of the present invention will be described in detail by taking the power type integrated switching tube MIP282 as an example. This embodiment is only for further explanation of the present invention, not a limitation of the present invention. Other types of switching power supply chips are selected, such as TOPSwitch series or VIPER22 series can also realize the technical effect of the present invention, and should also fall into the protection scope of the present invention:

[0015] A high-voltage adjustable step-down circuit with input-output common ground, the principle is as follows figure 1 As shown, the high-voltage input terminal can be 220VAC mains or about 300V DC. After bridge rectification and π-type filtering, it enters the switching integrated circuit, followed by a typical BUCK step-down circuit, and the voltage-stabilizing reference circuit provides a voltage-stabilizing reference voltage...

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Abstract

The invention discloses an input-output common ground based high-voltage adjustable step-down circuit. A high-voltage alternating current or a high-voltage direct current of a high-voltage input end enters a switch integration circuit through bridge rectification and pi filtering; the switch integration circuit is connected with a typical BUCK step-down circuit; a voltage stabilization reference circuit provides a voltage stabilization reference voltage and turns on a photoelectric isolator; the photoelectric isolator provides a feedback voltage; and the photoelectric isolator is used for feedback isolation between a high-voltage input and a low-voltage output, so that the interference of a high-voltage-side signal on a low-voltage-side signal is reduced. The high-voltage direct current or alternating current is converted into a low-voltage direct current; a resistance value of a slide rheostat is changed to obtain different low-voltage direct-current voltages; and the high-voltage adjustable step-down circuit can be widely applied to step-down circuits of high-voltage switches, especially certain instrument devices with requirements of converting commercial power into a direct-current low-voltage adjustable power supply.

Description

technical field [0001] The invention relates to a high-voltage switch step-down circuit, in particular to a high-voltage adjustable step-down circuit with input-output common ground. Background technique [0002] In a high-voltage control system, in order to simplify the control, an auxiliary power supply with input and output common ground is often required to supply power to the control system. The control system generally requires a high-voltage step-down circuit to provide a low-voltage DC power supply for the system. At present, the conventional methods for converting 220AC mains power into low-voltage DC include linear transformer isolation step-down, resistance-capacitance step-down and other methods. The linear step-down is isolated and stepped down by a transformer, rectified and filtered, and then output low-voltage direct current. As the core device, the transformer is selected by the load voltage and power. The disadvantages of linear step-down power supplies ...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M3/156
CPCH02M7/217H02M3/1563
Inventor 吕士如李斌王文廷李雷张永坡王群汪定华王俊
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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