| 摘要 |
PURPOSE:To simplify a constant-current circuit and to reduce the cost by commonly controlling the outputs of a plurality of resonance type constant-current converters by a control circuit. CONSTITUTION:Resonance type constant-current converters CONVa-CONVm respectively convert DC inputs inputted from input terminals IN1-INm via an inverter 1 into AC, and the output of the inverter 1 is inputted through a transformer T to a resonance circuit 2. The output of the circuit 2 is outputted through a rectifier 3 and a smoothing circuit 4. The output current is detected by an output current detector 9, and the output is inputted to a controller CONT. The controller CONT compares by an operational amplifier AMP the input with the reference voltage, and controls the conductivity of a transistor Tr in response to the compared result. A V/F converter 7 controls the frequency of the inverter 1 in response to the output of a current/voltage converter 8. |
