High-voltage amplifier and multi-channel adjustable high-voltage output power supply circuit

Abstract

The invention discloses a high-voltage amplifier and a multi-channel adjustable high-voltage output power supply circuit, which comprises a high-voltage equalization unit, an NPN transistor series amplification unit, a PNP transistor series amplification unit and an optical coupler, and is characterized in that the high-voltage equalization unit is connected with the PNP transistor series amplification unit and the NPN transistor series amplification unit; high-voltage reference power is input into the high-voltage end of the PNP transistor series amplification unit; the input end of the PNP transistor series amplification unit is connected with the optical coupler; the output end of the PNP transistor series amplification unit is connected with the output end of the high-voltage amplifier; the output end of the NPN transistor series amplification unit is connected with the optical coupler; the optical coupler is connected with the output end of the high-voltage amplifier, or the output end of the NPN transistor series amplification unit is used as the output end output voltage of the high-voltage amplifier. According to the high-voltage amplifier and the multi-channel adjustable high-voltage output power supply circuit, the use of a plurality of boosting transformers can be avoided, the output voltage is higher, and the voltage adjusting range is larger.

Description

technical field [0001] The invention relates to the field of power supply circuits, in particular to a high-voltage amplifier and a multi-channel adjustable high-voltage output power supply circuit. Background technique [0002] Electronic products such as laser printers usually require multi-channel adjustable DC or AC high-voltage power supplies of thousands of volts to thousands of volts. These high-voltage power supplies are usually obtained through electronic oscillators, step-up transformers, voltage doubler rectifiers and other circuit links. Due to the withstand voltage limit of semiconductor devices, voltage adjustment and control are generally controlled by controlling the amplitude of the low-voltage oscillating circuit on the primary side of the transformer, and then stepping up the transformer to obtain the required AC high voltage, and then rectifying or controlling the high-frequency AC high voltage. Voltage doubler rectification to obtain the required DC high...

AI Technical Summary

Problems solved by technology

[0004] When the circuit needs AC high voltage, the frequency of the required AC high voltage is generally 1kHz ~ 2kHz, which is relatively low, and the required step-up transformer has more winding turns, a larger magnetic core cross-section, a large transformer size, and high cost; if necessary Multi-channel AC high voltage requires multiple step-up transformers, and the structure size is larger

The above-mentioned high-voltage linear regulator is usually not suitable for AC high-voltage regulation due to the large voltage loss and low efficiency; when the frequency requirements of various AC high-voltage channels are different, the scheme of sharing the AC high-voltage reference power supply is also unsuitable

Images