Load power adjusting circuit driven by frequency conversion of MOS type device

Abstract

The invention discloses a load power adjusting circuit driven by frequency conversion of a metal oxide semiconductor (MOS) type device, which is used for driving a single-phase load. The circuit comprises a power supply circuit and a power control circuit, and the power control circuit is connected in series with the single-phase load and then connected in parallel with the power supply circuit inalternating-current mains supply. A first positive electrode output end of the power supply circuit is connected with a power input end of the grid driving circuit. A second positive electrode outputend of the power supply circuit is connected with a power supply input end of the PWM signal module, and a negative electrode output end of the power supply circuit is connected with a power supply output end of the PWM signal module, a power supply output end of the grid driving circuit and a signal output end of the power control circuit. The signal output end of the PWM signal module is connected with the signal input end of the power control circuit through the grid driving circuit. The circuit is simple in structure, and the MOS tube can be directly used for controlling load power in analternating current circuit. The drive circuit is suitable for driving any one of an incandescent lamp load, a single-phase alternating-current motor load, a resistance wire load, a single-row LED lamp set load and a double-row LED lamp set load.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a load power adjustment circuit, in particular to a load power adjustment circuit driven by frequency conversion of MOS devices. Background technique [0002] In many fields of industrial production and life, people need to control and adjust the power of single-phase load stably, so as to realize the functions of energy saving and gear adjustment of electronic and electrical products. At present, the power adjustment method of single-phase load mainly uses thyristor to adjust the voltage on the load to adjust the power of the load. The thyristor adjusts the power by changing the conduction angle to change the load voltage waveform, thereby changing the average value of the load power to achieve the purpose of power regulation. This makes the load voltage waveform of the thyristor to adjust the power incomplete, and there are disadvantages such as large leakage current, ...

AI Technical Summary

Problems solved by technology

The method of frequency conversion to adjust the power needs to add an additional motor drive chip, which makes the circuit structure complex and increases the cost. At the same time, there is energy loss due to the conversion of AC and DC.

Images