a bleeder circuit

Abstract

The embodiment of the invention provides a bleeder circuit, and relates to the technical field of electron. The bleeder circuit comprises a first modulation circuit, a duty cycle adjustment module, a frequency adjustment module, a modulation chip and a bleeder module. The first modulation circuit, the duty cycle adjustment module, the frequency adjustment module and the bleeder module are all connected to the modulation chip, and the duty cycle adjustment module and the frequency adjustment module are further connected to the first modulation circuit. Whether a voltage of a power source exceeds an overvoltage set value or not is detected through the first modulation circuit, a PWM signal is generated by controlling the modulation chip, and according to the voltage, which exceeds the overvoltage set value, of the power source, the duty cycle modulation module and the frequency adjustment module adjust the duty cycle and the frequency of the PWM signal output by the modulation chip respectively to further achieve the work time of the bleeder module and to achieve the purpose of electric energy release of the power source. According to the bleeder circuit, the resource of an MCU and software resources can be not occupied, time and labor are saved, moreover, the bleeder resistor is connected when the electric energy is bled, and unnecessary heating of devices is reduced.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a discharge circuit. Background technique [0002] At present, the solution to the excessive voltage of the busbar is to use a bleeder circuit, which is a circuit that deliberately consumes a part of energy and converts it into heat or other forms of energy. There are two ways to realize the traditional bleeder circuit: the first way is to implement it through hardware. After detecting that the DC bus has reached the overvoltage setting value through a part of the control and conditioning circuit, the DC bus voltage is directly connected to the bleeder resistor. Energy consumption; there is also a discharge circuit controlled by a time-base chip, but the speed of discharging energy is certain and not smart enough. The second method is implemented by software. The MCU constantly detects the bus voltage and controls the frequency of the discharge through software, whic...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the embodiments of the present invention is to provide a discharge circuit to improve the waste of resources, time-consuming and fixed speed of discharging electric energy in the prior art, which is not intelligent enough.

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