Two-way DC power supply is often used in the test of automotive electronic systems, because many electronic systems are used in the use of intelligent electrical appliances on the car, including seat movement, heating, car brush operation, and light flashing, etc., need to use the power supply for testing. The most important advantage of bipolar testing is the ability to perform ripple overlay testing, which simulates the electrical environment of automotive electronic systems and tests the quality and durability of automotive electrical components.

 

500kW load bank
 

The customer has raised concerns about the voltage balance of the bidirectional DC power supply components, which makes us pay more attention to the voltage balance of the bidirectional DC power supply components.

If the voltage of the bidirectional DC power supply component is unbalanced, the switching time will be different when the bidirectional DC power supply uses multiple stages in series to make the high voltage circuit, resulting in the specific circuit to withstand too high voltage. Reducing the voltage unbalance of two - way DC power supply element is the key of series circuit.

In the previous experimental circuit of two-way DC power supply, it has been tried to increase the voltage by increasing the series, but it still can not solve the problem of voltage imbalance of each component of the power supply, resulting in component damage. A different approach was tried several times and the problem was solved by installing a capacitor that ignored the parasitic capacitance.

The parasitic capacitance varies according to the applied voltage and temperature. In the constant-current circuit of the MOS FET originally studied, the voltage applied to the various levels is unbalanced due to the variation (fluctuation) of the parasitic capacitance, resulting in excessive voltage applied to one MOS FET, causing damage.

However, in the circuit to be restudied, by adding a capacitor for voltage balancing, no capacitance fluctuation occurs when voltage is applied due to parasitic capacitance, and no damage is caused even when high voltage is applied, and it is easy to form a high-voltage bidirectional constant-current circuit. In terms of cost, this volume is only about a quarter of that of a typical high-pressure component, and can be accomplished at a low cost without substantially changing the specifications.