BLDC motor soft start test system with DC voltage input

Abstract

The invention discloses a BLDC motor soft start test system with DC voltage input. The system comprises a logic control circuit MCU, a VM soft start circuit, a VM peak absorption circuit, a VCC soft start and peak absorption circuit, a VSP circuit and a BLDC motor, wherein the logic control circuit MCU is respectively connected with the VM soft start circuit, the VCC soft start and peak absorption circuit and the VSP circuit; and the BLDC motor is respectively connected with the FG and the GND. By arranging the MCU, the VM soft start circuit, the VM peak absorption circuit, the VCC soft start and peak absorption circuit and the VSP circuit which are respectively connected with the BLDC motor, the VM soft start circuit and the VCC soft start circuit respectively realize smooth on-off of VM and VCC voltages, so that a relay is prevented from generating peak voltages, the VM peak absorption circuit can effectively inhibit the surge generated by the electrification of the bus capacitor from conflicting with the amplitude of the voltage, and the VCC voltage provides a stable voltage through the VCC peak absorption circuit. The BLDC motor soft start test system has the advantage that the VCC motor and the BLDC motor are not damaged.

Description

technical field [0001] The invention relates to a BLDC motor start system, in particular to a BLDC motor soft start test system with DC voltage input. Background technique [0002] For BLDC motor products powered by DC voltage input bus (VM) 310V and logic circuit (VCC) 15VDC, relays are usually used to control the switching of DC bus voltage and VCC voltage during testing, and there is no timing control for power-on and power-off. When the switch is momentary, an arcing phenomenon will occur. When the relay is turned off, the winding of the relay will discharge, which will cause a large peak voltage on the VCC power supply line, thus causing the risk of VCC damage during the motor test. During the test, timing control is not performed during power-on and power-off. In a harsh grid environment, when a large interference signal appears, it will cause the risk of damage to the BLDC motor. [0003] Therefore, existing BLDC motor tests have the problem that the VCC and the BLDC...

AI Technical Summary

Problems solved by technology

[0002] For BLDC motor products powered by DC voltage input bus (VM) 310V and logic circuit (VCC) 15VDC, relays are usually used to control the switching of DC bus voltage and VCC voltage during testing, and there is no timing control for power-on and power-off. When the switch is momentary, arcing phenomenon will occur. When the relay is turned off, the winding of the relay will discharge, which will cause a large peak voltage on the VCC power supply line, thus causing the risk of VCC damage during the motor test.

During the test, timing control is not performed during power-on and power-off. In a harsh grid environment, when a large interference signal appears, it will cause the risk of damage to the BLDC motor

[0003] Therefore, the existing BLDC motor test has the problem that VCC and BLDC motor are vulnerable

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