Overpower protection circuit of low-voltage power supply of motor controller
An over-power protection, low-voltage power supply technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problem of large blind area of low-voltage side over-current protection
Pending Publication Date: 2018-08-17
JEE AUTOMATION EQUIP SHANGHAI CO LTD
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Problems solved by technology
[0006] The object of the present invention is to provide an overpower protection circuit for a low-voltage power supply of a motor controller to solve the problem of a large blind area of overcurrent protection on the low-voltage side
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[0020] Such as figure 1 As shown, the overpower protection circuit applied to the low-voltage power supply of the automobile controller introduced in this embodiment includes a control switch Q1 and a sampling resistor R1 connected in series with the positive pole VIN+ power supply line of the low-voltage power supply of the automobile controller. The control switch Q1 adopts a MOS Tube Q2, the source and drain of the MOS tube Q2 are connected in series to the positive power supply line of the low voltage power supply. Both ends of the sampling resistor R1 are respectively connected to the positive and negative input terminals of the operational amplifier U1B, the output terminal of the operational amplifier U1B is connected to the negative input terminal of the comparator U2B, and the non-inverting input terminal of the comparator U2B is connected to the reference voltage VREF , the reference voltage VREF is set as the overcurrent protection threshold VREF, the output termina...
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The invention discloses an overpower protection circuit of a low-voltage power supply of a motor controller. The overpower protection circuit of the low-voltage power supply of the motor controller comprises a control switch Q1 and an overcurrent sampling unit which are successively serially connected with an anode power supply wire of the low-voltage power supply, the output end of the overcurrent sampling unit is successively connected with an amplifier U1B and an overcurrent detecting unit, and the overcurrent detecting unit is connected with the control switch Q1 through a driving unit, and controls switch-on and switch-off of the control switch Q1. The overcurrent sampling unit uses a sampling resistor R1 with milliohm precision. The overcurrent detecting unit uses a comparator U2B, the driving unit uses a triode Q2, and the anode power supply wire of the low-voltage power supply is further serially connected with a reverse protecting switch S1. A low-voltage loop of a controlleris serially connected with a current sampling resistor, therefore, the current of the low-voltage loop can be detected in real time, and after the current is compared to a protecting threshold value,operation of the low-voltage loop is controlled.
Description
technical field [0001] The invention relates to power overcurrent protection, in particular to an overpower protection circuit applied to a low-voltage power supply of an automobile motor controller. Background technique [0002] Due to the high reliability requirements of automotive electronics, and the concept of green environmental protection has attracted more and more attention, high-efficiency motor controllers with various protection functions have been widely used in the field of new energy vehicles. One of these protection It is over-current protection, but commonly used motor controllers have over-current protection on the high-voltage power supply side. Once an abnormality on the high-voltage power supply side causes over-current on the low-voltage power supply side, it often relies on the protection function of the battery or fuse on the low-voltage side . [0003] The technology closest to this technology is fuse, power distribution box overcurrent protection, ...
Claims
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Login to View More IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 刘蕾鲍建波孙纯哲范佳伦
Owner JEE AUTOMATION EQUIP SHANGHAI CO LTD