Dimming power supply

A dimming power supply, comprising:

• a power supply circuit, wherein an output end of the power supply circuit is connected with a load;
• a power control transistor, wherein the power control transistor is connected in series between the power supply circuit and a negative electrode of the load;
• a control circuit, an input end of the control circuit is connected with the output end of the power supply circuit;
• a driving circuit, an input end of the driving circuit is connected with an output end of the control circuit, and an output end of the driving circuit is connected with a gate of the power control transistor;
• and
• a short-circuit protection circuit, wherein the short-circuit protection circuit includes a voltage sampling circuit and a first switching device, an input end of the voltage sampling circuit is connected to the negative electrode of the load, and an output end of the voltage sampling circuit is connected to a control end of the first switching device;
• when the first switching device is turned on, a signal input to the gate of the power control transistor is pulled down or truncated, a second switching device is connected in series in the voltage sampling circuit, a control end of the second switching device is connected to the gate of the power control transistor, and when the power control transistor is turned off, the second switching device is turned off.