Topology of the lag arm ZCS of electroplated electric heating pipe

Topology of the lag arm ZCS of electroplated electric heating pipe

The topology of the lagging arm ZCS is realized by the secondary side plus the redundant dosing network. The circuit is dominated by two diodes and one capacitor to form a redundant circuit to realize zero-current switching of the lag arm, and the voltage on the secondary side drain capacitor Cs acts on the primary side as a back electromotive force, so that the primary side circulating current attenuates to 0, and the rectifier diode When turned off, the secondary side bus capacitor no longer reflects to the primary side, but supplies power to the load. Therefore, the circulation does not increase in the opposite direction. This circuit is cumbersome, solves the problem of current reset and secondary side rectifier diode voltage spike discharge, and does not consume a lot of energy, with high compliance and small loss of duty cycle, so the circuit has a high applicable price. However, this circuit increases the current stress of the power switch tube, and it becomes difficult to achieve soft switching of the super front arm (or hard turn-on of the super front arm occurs), and it is difficult to select the value of Cs.

Electroplating electric heating tube primary side series bidirectional active switch

A bidirectional active switch is connected in series on the primary side. A bidirectional active switch is connected in series on the primary side to prevent the reverse current formed by the back EMF. This circuit is currently rarely used in theory. In addition, regulatory complexity is increased due to the presence of active devices. Typical topology of ZVZCS with secondary side donating circuit type Typical topology of ZVZCS with secondary side donating circuit type

Blue-white and color passivation agent for electroplating trivalent chromium zinc coating

Replacing carcinogenic hexavalent chromium salts with trivalent chromium salts. The blue-white passivation color is like a chrome-plated layer. It has passed the test of neutral salt spray for more than 26 hours and has experienced market tests for ten years. The color passivation has completed laboratory research, and the color is bright, but it needs to be tested in the pilot test.

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