| 摘要 |
A power supply circuit with low-voltage control and a producing method thereof. The circuit includes an auxiliary power supply, a high-voltage startup unit, a switching circuit, and a control circuit. When the circuit is powered on, a storage capacitor in the switching circuit is charged by the high-voltage startup unit and supplies the control circuit with a low-voltage power source so that the control circuit is started up completely. After the circuit enters a normal operation state, the control circuit detects the voltage across the storage capacitor and dynamically controls the switching circuit to charge the storage capacitor so that a steady low-voltage power source supplied for the control circuit is obtained. Without reducing the efficiency of the power supply, the circuit is simplified and the cost is lowered.
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