| 摘要 |
PURPOSE:To facilitate the design and manufacture by connecting a plurality of high-frequency inverters in parallel, by connecting in series the secondary winding of each current transformer to detect the output current of each inverter, and by balancing each output current. CONSTITUTION:High-frequency inverters 1-3 of half bridges composed of two switches Q1, Q2 and series resonance capacitors 12, 13 are connected in parallel, and supply AC power to a common load 5. And a current transformer 21-23 is connected to the output line of each inverter 1-3, and their secondary sides are connected to one another in series. Furthermore, to the secondary-side circuit an auxiliary current transformer 31 is connected, the output current of its secondary winding is returned to a control circuit 4, and the currents of the inverters 1-3 are controlled. Accordingly, the current transformers 21-23 function as not only current balancers but also current detectors. This makes it possible to do wiring only by winding thin wires round, and the design and manufacture are facilitated. |
