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Start protecting circuit of low-voltage and high-power motor

A start-up protection and high-power technology, which is applied to the starter of a single DC motor, emergency protection circuit device, motor generator/starter, etc., can solve the problem of local temperature rise of the controller and PWM duty cycle adjustment should not be too fast , Power resistors are bulky and other problems, to achieve the effect of fast response, protection start-up performance, and high reliability

Inactive Publication Date: 2011-03-30
许晓华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large current when the low-voltage high-power motor is started, heat loss will be generated on the resistor, which will cause the local temperature of the controller to rise rapidly, and the power resistor is too large; when the motor is started at low voltage, high current, and high power, PWM Duty cycle adjustment should not be too fast
With the current protection measures, neither the soft start nor the series resistance start can take into account multiple protection tasks such as the rapidity of motor start, heat loss, and overheating protection. Therefore, it is necessary to propose a more effective protection circuit that can simultaneously Taking into account multiple protection tasks when starting low-voltage and high-power motors

Method used

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  • Start protecting circuit of low-voltage and high-power motor
  • Start protecting circuit of low-voltage and high-power motor
  • Start protecting circuit of low-voltage and high-power motor

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Embodiment Construction

[0015] Such as figure 1 , figure 2 As shown, the present invention is a starting protection circuit for a low-voltage high-power motor, including a micro-processing unit 1, a starting resistance control unit 4, a motor drive unit and a current detection unit 6, and the starting resistance control unit 4 is used to limit the motor 5 The starting current, the micro-processing unit 1 is connected to the motor 5 through the motor drive unit, and controls the motor 5 speed by adjusting the duty cycle input by the motor drive unit, and the micro-processing unit 1 controls the motor according to the detection signal of the current detection unit 6 The maximum current of the circuit.

[0016] The motor drive unit includes a PWM drive signal unit 2 and a drive circuit 3; the start resistance control unit 4 includes a power resistor R and a power transistor Q2 connected in parallel to the power resistor R, and the microprocessing unit 1 drives the power transistor Q2 to conduct throug...

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Abstract

The invention discloses a start protecting circuit of a low-voltage and high-power motor. The start protecting circuit comprises a microprocessing unit, a starting resistance control unit, a motor driving unit and a current detection unit, wherein the starting resistance control unit is used for limiting the starting current of a motor; the microprocessing unit is connected with the motor through the motor driving unit and controls the rotation speed of the motor by adjusting the duty ratio input by the motor driving unit; and the microprocessing unit controls the maximal current of a motor circuit according to a detection signal of the current detection unit. The start protecting circuit is a protecting circuit which combines the advantages of soft start and series resistance start and is quick in response and high in reliability.

Description

technical field [0001] The invention belongs to the technical field of circuit design, in particular to a starting protection circuit of a low-voltage high-power motor. Background technique [0002] Low-voltage high-power motors use low-voltage levels when starting, and the current is very large at one pass. At present, two protection measures are usually used for this type of motors: soft start or series resistance start. Due to the large current when the low-voltage high-power motor is started, heat loss will be generated on the resistor, which will cause the local temperature of the controller to rise rapidly, and the power resistor is too large; when the motor is started at low voltage, high current, and high power, PWM The duty cycle adjustment should not be too fast. With the current protection measures, neither soft start nor series resistance start can take into account multiple protection tasks such as rapid motor start, heat loss, and overheat protection. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08H02P1/20
Inventor 孙晓东
Owner 许晓华
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