Maintenance Methods of Controller

1, When the electric car controller does not output

1) Set the multimeter in the +20 (DC) gear, measurement of the gate to the output signal high and low potential.
2) If the brake gate, the brake signal has more than 4V potential changes, you can rule out the brake failure.
3) Then according to the brush controller commonly used on the foot function table, and the measured master logic chip logic circuit voltage analysis, and check the chip peripheral devices (resistors, capacitors, diodes), check whether the value of components The surface of the identity consistent.
4) Finally check the external device or integrated circuit, you can replace the same type of device to troubleshoot.

2, When the electric vehicle controller is completely no output

1) With reference to the motor controller check the main phase measurement diagram, with a multimeter DC voltage +50 V file to detect whether the six-way MOS tube gate voltage and the handlebar rotation angle of the corresponding relationship.
2) If there is no, that the controller in the PWM circuit or MOS tube driver circuit is faulty.
3) With reference to the main phase check diagram of the controller, whether the voltage of the input and output pins of the chip has a corresponding relationship with the rotation angle of the switch can determine which chips are faulty and replace the same type chip to eliminate the fault.

3, When the electric car brush control device control power supply is not normal

1) electric vehicle controller internal power supply generally used three-terminal regulator IC, general 7805,7806,7812,7815 three-terminal voltage regulator integrated circuits, their output voltage is 5V, 6V, 12V, 15V.
2) Set the multimeter at DC voltage + 20V (DC), and place the multimeter black and red test pen against the black line and red line of the switch. Observe whether the multimeter reading corresponds to the nominal voltage, and their voltage difference Should not exceed 0.2V.
3) Otherwise, the controller internal power failure, the general brush controller can be replaced by three-terminal regulator IC troubleshooting.

4, When the electric car without controller phase

Controller power supply and brake failure can refer to the brush controller troubleshooting methods to exclude the controller, there are unique fault phenomena, such as lack of phase. Electric vehicle controller phase failure phenomenon can be divided into the main phase loss and hall phase two cases.
1) The main phase detection method can refer to the electric car brush controller speed fault diagnosis method to detect whether the MOS tube breakdown, controller MOS tube breakdown is generally a phase of a pair of upper and lower MOS tube While the breakdown, to ensure replacement at the same time replacement. Check the measuring points.
2) electric car controller hall lack phase performance for the controller can't recognize the motor hall signal.

Influence of Power Quality on Photovoltaic Inverter

With the increasing depletion of non-renewable energy and the large-scale PV system in the power system, the interaction between PV system and power grid becomes closer and closer.

On the one hand, because the PV power generation is controlled by the maximum power point tracking strategy, the output power is directly related to the solar irradiance and the ambient temperature, and the solar irradiance is not a stable value with time, weather and many other factors. Therefore, the output of photovoltaic power generation in the day also has a greater volatility. Large volatility will lead to the PV system voltage fluctuations, voltage flicker, frequency fluctuations and a series of power quality problems.

Among them, the photovoltaic power generation system through the power electronic devices to achieve power conversion and grid operation. In this process, the inverter high-frequency characteristics and non-linear characteristics will have more harmonic and DC components, affecting the user power quality. Damage to user equipment, resulting in economic losses.

On the other hand, the existence of harmonic and unbalanced negative sequence components in the power grid will lead to the output of photovoltaic power system active power and output current distortion will affect the normal operation of photovoltaic grid-connected inverter.

Influenced by various factors, the output power of photovoltaic power generation system is characterized by discontinuity and uncertainty, among which meteorological conditions are the most significant.

The influence of harmonic and unbalanced negative sequence components on the output power and output current of PV system. Under the condition of different voltage distortion rate of power grid shows the contradictory harmonic and unbalanced negative sequence components in the grid will lead to the fluctuation of the active power output of the PV system. The higher the grid voltage distortion rate is, the lower the active power output of the PV system will be. The higher the distortion rate of the grid voltage, the PV system output current THD is bigger.

Daily Maintenance of the Inverter

Inverter bring a lot of convenience to the owner. It is equivalent of a small car power supply. But the knowledge about inverter maintenance may be a lot of owners are not to understand.

If it does not work, you have to check whether the line has been connected. If can't be activated, you just connect the line re-connected just fine.

You will note that under normal circumstances the light will light, because the car inverter circuit generally has a power-on soft-start function, so after the power to wait 5s-30s after the exchange of 220V output while LED indicator light. when the LED light does not shine, it indicates that the inverter circuit is not working, just wait for some time.

When you turn on the power for more than 30s, you also find that the LED light is not lit, it is recommended that you go to a professional shop for repair, because it may be internal problems. There is a complex circuit, if you disassemble at random, the worst may make your car inverter can no longer use, it is recommended that you do not operation casually.

You also wait for a period of time, and also find that the LED indicator is not lit. You need to measure the AC output voltage at the AC output socket, if the voltage is about 220V normal, it is only part of the LED indicator of the circuit failure. If measured by the AC output socket AC voltage value is 0, then the cause of the failure of the inverter circuit does not work, the chip internal protection circuit has been started.

The method to judge internal protection circuit is: with a multimeter DC voltage block chip 3 feet to DC voltage value. If the voltage is 1V or more then the chip internal protection circuit has been activated, otherwise is the non-protective circuit action.