Overcurrent protective device for DC brush motor

A brushed DC motor and overcurrent protection technology, applied in emergency protection circuit devices, measuring devices, measuring current/voltage, etc., can solve problems such as permanent damage to power switch tubes and motors, current impact, frequent start and stop, etc., to achieve Enhance anti-interference performance, reasonable and effective protection, and prolong working life
CN101414747AInactive Publication Date: 2009-04-22NINGBO LIFTSTAR MATERIAL HANDLING EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO LIFTSTAR MATERIAL HANDLING EQUIP CO LTD
Publication Date
2009-04-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a DC brush motor overcurrent protection device, which consists of a micro controller, a bridge drive circuit and an executive circuit. The pulse width modulation output port of the micro controller is communicated with the pulse width modulation receiving port of the bridge drive circuit; the output signal control port of the bridge drive circuit is connected with the executive circuit; the bottom end of the executive circuit connects a current sampling resistor R5 to the ground and a pressure detection point is formed by the connecting point of the executive circuit and the current sampling resistor R5; one line of a pressure signal of the pressure detection point is connected with the input terminal of a hysteresis comparator and the other line of the pressure signal is connected with the input terminal of a proportional amplifier; the output terminal of the hysteresis comparator is connected with DIS terminal of the bridge drive circuit; the output terminal of the proportional amplifier is connected with the analog-digital conversion sampling port of the micro controller. The DC brush motor overcurrent protection device introduces software to detect the current of a main circuit on the basis of hardware protection and sets up relevant parameters of the software so as to achieve effective and reasonable protection of an electronic power tube and a motor when the circuit is in overcurrent.
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Description

technical field

[0001] The invention relates to a motor overcurrent protection technology, in particular to an overcurrent protection device for a DC brushed motor. Background technique

[0002] In the application field of overcurrent protection of brushed DC motor control circuit, it is common practice to connect one or several parallel power resistors in series between the source of the switching tube of the lower bridge arm of the executive circuit and the ground, and the resistance value depends on the current from several milliohms ranging from a few euros. The voltage signal is taken from the connection between the resistor and the source of the switch tube and then processed and sent to the microcontroller or other hardware circuits. When it is detected that the voltage signal at this point is higher than a certain set value, the control circuit responds to the set action to implement circuit overcurrent protection. . Under normal circumstances, this detection signa...

Claims

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