Voltage regulation circuit and method for motor, control system, electric appliance and medium

Abstract

The invention provides a voltage regulation circuit, method and device for a motor, a control system, electrical equipment and a storage medium. The method comprises the following step: controlling the working state of a PFC circuit according to the operation parameters of the motor so as to adjust the DC bus voltage outputted to the motor and enable the DC bus voltage outputted by the PFC circuit to adaptively change along with the rotation speed of the motor and a load. Thus, the iron loss of the motor is reduced, voltage stress borne by a switching device is reduced, the output power of the motor is improved, the service life of a controller is prolonged, and the stability of a system is improved.

Description

technical field [0001] The present application relates to the field of motor drive, and in particular to a voltage regulation circuit, method, device, control system, electrical equipment and storage medium for a motor. Background technique [0002] In the field of permanent magnet synchronous motor drive, traditional controllers have a power factor correction module (PFC) circuit. In the case of low load, the step-down (Buck) type PFC circuit is the main one, and the DC bus voltage is always stable below 311V A certain specific voltage value; in the case of heavy load, the boost (Boost) type PFC circuit is the main one, and the DC bus voltage has been stable at a specific voltage value above 311V. In this way, the driving power range of the controller is limited, and the controller used in a low-load situation cannot drive a motor with a heavy load. Due to the high bus voltage and large output current, the controllers used in heavy load applications are subjected to high v...

AI Technical Summary

Problems solved by technology

In this way, the driving power range of the controller is limited, and the controller used in low-load applications cannot drive a large-load motor

Due to the high bus voltage and large output current, the controller used in the heavy load occasion has a large voltage stress on the switching device and a short service life, so it cannot normally drive the motor with low load, and the output power of the motor is low.

Traditional controllers have poor applicability, limited drive power range, and low motor efficiency

[0003] The patent No. 201320557337.3 discloses an improved PFC voltage self-regulating LED drive power supply. An LLC circuit is added to the PFC post-stage circuit, and the LLC circuit always works near the resonance frequency point, which improves the load efficiency; in the LLC circuit A sampling circuit is added to sample the load voltage, and the sampling signal is fed back to the PFC circuit to achieve the function of PFC voltage self-regulation; however, the operating frequency range of the LLC circuit is small, and the load range of the system is small, resulting in poor system applicability; in LLC The sampling circuit is added to the circuit to sample the load voltage, and components are added, resulting in circuit load and high cost

[0004] It can be seen that in the prior art, the permanent magnet synchronous motor controller has the problem that the DC bus voltage cannot follow the change of the permanent magnet synchronous motor speed and torque.

[0005] For general boost circuit controllers, the bus voltage is higher than 1.414*U rms A certain fixed value (U rms is the effective value of the AC input voltage of the controller, the single-phase mains is 220V), when the motor is running at low speed, the bus voltage is greater than the voltage required by the motor, resulting in high motor loss, reduced motor efficiency, and the controller switching device voltage High stress affects service life

[0006] For general step-down circuit controllers, the bus voltage is lower than 1.414*U rms A certain fixed value (U rms is the effective value of AC input voltage, single-phase mains is 220V), when the motor is running at a high speed, the bus voltage may be lower than the voltage required by the motor, resulting in the limitation of the motor speed, or the increase of the operating current, affecting the efficiency of the motor

[0007] For the above problems, no effective solution has been proposed yet

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