| 摘要 |
A power supply for an ac discharge lamp utilizes a switching transistor for turning on and off the dc current from a dc power circuit. The dc current is then fed to a low pass filter for supplying the dc power to the lamp with alternating polarity. A voltage and a current sensing circuits effective to control the dc power to a substantially constant level is connected to a control circuit for controlling the on and off times of the switching transistor. In such a power supply, the voltage and current sensing circuits are made up of transformers whereby the high-voltage circuit section is effectively separated and insulated from the low-voltage circuit section so as to prevent any possible electrical shocks. |
