The system is converted by an input DC power supply through a switching type booster circuit, and outputs a voltage of 12V to provide a working voltage for the constant current source circuit. The D/A output signal inside the MCU is controlled by a button to make the constant current source circuit output a constant current. At this time, when the voltage value at both ends of the load is greater than the set value, the alarm module is controlled by the internal A/D signal of the MCU. The system structure block diagram is shown in Figure 1:
Figure 1 overall system block diagram
2, boost circuit analysisThe circuit is mainly composed of XL6009 step-up DC power converter chip, Schottky diode B54 and inductor. The 3-pin output of the XL6009 is a square wave signal. As a switch, when the 3 pin outputs a low level, D1 is cut off, the inductor L1 acts as a storage element to store the voltage, and the capacitor and RV1 and R1 form a loop discharge, causing the output voltage to drop; when the 3 pin outputs a high level, D1 is turned on, Inductor L1 charges both ends of the capacitor and the output voltage rises. RV1 and R1 are voltage amplifiers with internal XL6009. As a negative feedback, the output voltage is regulated by a resistor RV1 and R1. The schematic diagram of the boost module circuit is shown in Figure 2:
Figure 2 Schematic diagram of the boost module circuit
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