The invention relates to a circuit for controlling the current of an automotive electronic low-side load. The circuit comprises a load, a precision resistor R1, an MOS tube Q1, a differential amplifier U1 and a single-chip microcomputer. One end of the load is electrically connected with the power supply, and the other end is electrically connected with the precision resistor R1; the precision resistor R1 is electrically connected with the input end of the MOS tube Q1, and the output end of the MOS tube Q1 is grounded; the input end of the differential amplifier U1 is electrically connected between the resistor R1 and the input end of the MOS tube Q1, the output end of the differential amplifier U1 is electrically connected with the input end of the single-chip microcomputer, the output end of the single-chip microcomputer is electrically connected with the other input end of the MOS tube Q1, and the single-chip microcomputer compares the current current with the preset current to adjust the PWM percentage. According to the application, the magnitude of current is adjusted through on-off of an MOS tube Q1, an error is determined by comparing an actual measured value with a target set value through a single-chip microcomputer, and control output is adjusted by utilizing a proportion, integral and differential algorithm, so that the system is close to the set value as much as possible, namely, the current current is compared with an expected current value to adjust the PWM percentage, and the current value is adjusted. And final constant current control is completed.
本申请涉及一种用于汽车电子低边负载电流控制的电路,该电路包括负载、精密电阻R1、MOS管Q1、差分放大器U1和单片机;负载的一端电连接电源,另一端电连接精密电阻R1;精密电阻R1与MOS管Q1输入端电连接,MOS管Q1输出端接地;差分放大器U1输入端电连接到电阻R1与MOS管Q1输入端之间,输出端与单片机输入端电连接,单片机输出端与MOS管Q1另一输入端电连接,且单片机通过将当前电流和预设电流对比,调整PWM百分比。本申请通过MOS管Q1的导通关断调整电流的大小,通过单片机比较实际测量值和目标设定值来确定误差,并利用比例、积分和微分算法来调整控制输出,以使系统尽可能接近设定值,即将当前电流和预期电流值进行比对调整PWM百分比,完成最终恒流控制。
Circuit for automobile electronic low-side load current control
用于汽车电子低边负载电流控制的电路
2024-05-31
Patent
Electronic Resource
Chinese
IPC: | G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES , Systeme zum Regeln elektrischer oder magnetischer Veränderlicher / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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