| 摘要 |
<p>The invention provides a rectifier circuit, particularly suitable for use with inverter and transformer power supplies, stabilised against a fall in input voltage. The supply is applied through inductors (L1,L2) to a full wave diode bridge rectifier (CR1, CR2, CR3, CR4) having a pair of capacitors (C1, C2) connected across its DC output and a controllable bi-directional current device (CR5) connected between the common point of the capacitors, and at least one of the bridge inputs. A control circuit 21 switches on the bi-directional current device for part of each cycle in response to a drop in output voltage causing the circuit to function at least partially as a voltage-doubler rectifier. The control circuit may compare an error voltage derived from the output with the voltage from a ramp generator to provide pulses for switching the bi-directional devices. …<??>In a three-phase version of the circuit (not shown in Figure 3) inhibit circuits are provided to prevent more than one of the bi-directional devices becoming conducting at any one time.</p> |
