| 摘要 |
The constant voltage supplying circuit for a circuit breaker according the invention comprises: a first switching device; a constant current source configured to supply a constant current; a feedback circuit section commonly connected to an output terminal of each of the first switching device and the constant current source; a constant voltage source connected to the feedback circuit section, and configured to supply a constant voltage; a current adjusting circuit section connected to the output terminal of the first switching device, and configured to adjust an output current of the first switching device; and a divided voltage resistor section including a first resistor and a second resistor, and configured to provide a divided voltage of an output voltage of the constant voltage supplying circuit, to the feedback circuit section, through a connection node between the first resistor and the second resistor. |
| 主权项 |
1. A constant voltage supplying circuit for a circuit breaker, which receives a direct current input voltage obtained by converting an alternating current to a direct current from a rectifying circuit, the constant voltage supplying circuit comprising:
a first switching device configured to supply the direct current input voltage after stepping down a voltage; a constant current source connected to the first switching device in parallel, and configured to supply a constant current; a feedback circuit section commonly connected to the first switching device and output terminal of the constant current source; a constant voltage source connected to the feedback circuit section, and configured to supply a constant voltage; a current adjusting circuit section connected to the output terminal of the first switching device, and configured to adjust an output current of the first switching device; and a divided voltage resistor section connected to an output terminal of the current adjusting circuit section and a ground, including a first resistor and a second resistor, and configured to provide a divided voltage of an output voltage of the constant voltage supplying circuit, to the feedback circuit section, through a connection node between the first resistor and the second resistor. |
