Fan speed-adjusting circuit
A speed regulation and circuit technology, which is applied in pump control, non-variable pumps, machines/engines, etc., can solve the problems of large voltage instability error, limited working voltage, and high input voltage, and achieve accurate speed regulation voltage Stable, large adjustable voltage range, and stable feedback voltage
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[0015] Such as figure 1 As shown, the fan speed regulating circuit disclosed in the present invention is a complete high-efficiency switching constant voltage PWM fan speed regulating application scheme. It includes a switching power supply 21, a compensation circuit 22, a driving circuit 23, a constant voltage system 24, and a regulating system 25. The switching power supply 21, the compensation circuit 22, the driving circuit 23, the constant voltage system 24, and the regulating system 25 are electrically connected.
[0016] The switching power supply 21 includes a DC-DC switching constant voltage chip U1 and a resistor R5. The EN pin 2 of the DC-DC switching constant voltage chip U1 is suspended, the GND pin 5 is grounded, the VIN pin 7 is connected to the input voltage, and then the circuit Connected with other components and used as an adjustable output power supply to provide voltage for the entire circuit. The switching frequency of the DC-DC switching constant voltage ch...
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