3.light-emitting diode instrument

1. Structure and principle

The circuit of the LED indicator is an electronic circuit, which is separated from the circuit of the vehicle lamp.

The LED simulation indicates the high, medium, and low battery voltage and whether the battery is undervoltage. Its accuracy is relatively high, the price is cheap, and it is currently widely used in electric vehicle meters.

2. Fault detection and repair

The signal acquisition and signal processing of the light-emitting diode instrument use digital digital logic chips, and the circuit does not depend on the controller circuit and can work independently. In some electric vehicles, the signals from the handlebars and brake handles are transferred through the dashboard and then output to the controller. In an emergency, the lead wires of the handlebar and brake handle can be directly supplied to the controller for use.