| 摘要 |
PROBLEM TO BE SOLVED: To obtain a DC main power source and an auxiliary power source which has a potential higher than a positive terminal and a potential lower than a negative terminal of the main power source, without using a transformer in an AC power source. SOLUTION: In this DC power source circuit, an AC power source AC is connected with a bridge rectifier circuit DB, capacitors C1, C5 and the anode of a diode D1 are connected with a DB output positive terminal, a capacitor C2 and the anode of a diode D2 are connected with the cathode of the diode D1, and a capacitor C3 is connected with the cathode of the diode D2. The other terminal of the capacitor C5 is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the capacitor C4 and the anode of the diode 3, the cathode of the diode D3, and the other terminals of the capacitors C1, C3 are connected with the DB output negative terminal, and the other terminals of the capacitors C2, C4 are connected with different terminals of the AC power source AC. As to this circuit, the part between both terminals of the capacitor C1 is a DC main power source EM, the part between both terminals of the capacitor C3 is an auxiliary power source EH1 having a potential higher than the main power source EM, and the part between both terminals of the capacitor C5 is an auxiliary power source EH2 having a potential lower than the main power source EM.
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