Turned adjustable speed handles Shi, line beam 3 in the of blue line sP end voltage in 1.6V (minimum speed) ~4.3V (most high-speed) changes, this changes volume by R21, and R22 entered to TL494C2N (2) feet, that errors zoom device 1 of negative entered end, and (1) feet are entered end by received benchmark voltage (by R18, and R19 points pressure) for compared zoom, its output end (3) feet COMP 3.9V INPUT voltage (minimum speed) ~0.2V (top speed) reaction speed adjusting lever speed-controlled voltage variation. This variation with the oscillator generates a sawtooth wave after the PWM comparator compares. Output pulse width (duty cycle) the speed control handle voltage square wave, the QTl and the rear output QT2 drive again. In this circuit, QTl and QT2 is shot with their c. (8) legs and (11) leg 15V power supplies, signal from the e, that is, (9) foot and (10) foot output.

(9), (10) foot the PWM output a square wave voltage, D6, C20 T3 after rectifier and filter saturation breakover, drive relays, making it a cam, connected to 48V power supply for hub motor power supply. After D2, T1, the other driving high-power MOSFET VF5~VF8, to make it work in off status, while their breakover time determines the speed of wheel motors. Dang adjustable speed handles SP end voltage in 1.6V Shi, field effect tube of guide pass time short, wheels motor power of time short, equivalent plus in motor Shang of voltage low, motor speed low; Dang adjustable speed handles SP end voltage in 4.3V Shi, field effect tube of guide pass time long, wheels motor power of time long, equivalent plus in motor Shang of voltage high, motor speed high. D7, VF3 and VF4 is used to protect the relay, wheel motor coils produce high back EMF corrupted T3 and VF5~VF8.

Brake signal comes from the Brown wire of the wire harness 4. When braking, the BR1 Terminal output voltage 9V driving T2 saturated conducting. Speed handle voltage grounding via R21 SP, SP the Terminal voltage does not enter TL494CN (2) feet, so when (9) foot and (10) foot no PWM square wave output, T3 cutoff, VF5~VF8 stop, wheel motors power; saturated conduction other drives T4, and T3 cutoff relay contact open. Hub motor to power down.

The circuit with overcurrent and undervoltage protection. Overcurrent protection: on bonding gold wires by VF5~VF8 source of sampling resistor of the voltage through R7 input TL494CN input of error amplifier 2 (16) feet, and error amplifier 2 inputs (15) feet on the reference voltage (by the R8 and R9 partial pressure) for comparison. When the wheels when the motor current exceeds a certain value, (16) foot Dagan, the voltage (15) feet, (3) pin output high, (9), (10) leg PWM output square wave duty cycle is close to 0 (that is, the output voltage of 0V). T3, VF5~VF8 stop, wheel motors power failure stalled. Under voltage protection: detection of battery voltage (R2 and R6 voltage) input to the op amp LM358P (2) feet, the negative input of the op amp 1, with amplifier 1 input (3) foot the reference voltage (5V reference voltage by the R5 (3) feet) compared to amplification. When (2) pin voltage is below (3) feet, (1) pin output high.

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