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

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 ...

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, especially in the case of dynamic loads, the load adjustment performance is extremely poor, and it can only be used at low power constant Used under load conditions, the scope of application is narrow

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