In the bridge circuit, the main purpose of adding a DC blocking capacitor is to improve the anti-unbalance ability of the system. Because of this DC blocking capacitor, it means that DC bias is allowed, but as long as the voltage of the transformer in the system is positive or negative half a cycle If the product is the same (V and T can be different), it is still a safe system. To put it another way, that is to say, when this DC blocking capacitor exists, does it mean that the existence of positive and negative half-cycle asymmetric currents can be allowed?
Desmond Posted on November 17, 2020
This understanding seems to be problematic. The DC blocking capacitor is mainly the volt-second value of the balance transformer to avoid the single-directional deviation of the magnetic core dB. If the current (excitation current) is different, will it cause magnetic offset?
Romeo Posted on November 17, 2020
Is this your formula for calculating the excitation current? In the H-bridge, taking the positive half-cycle turn-on as an example, how can the current in the H-bridge be calculated in the process of transferring energy to the secondary side?
Danika Posted on November 17, 2020
This question depends on how you look at it, of course the peak current may be asymmetric. But IP*Ton should be equal, or dynamically equal. Otherwise, the DC blocking capacitor/balancing capacitor voltage will increase in one direction.
