| 摘要 |
<p>In an overcharge prevention method for a voltage storage element connected to a bridge rectifier circuit which includes a first switching section connected between one input terminal supplied with an AC voltage and a first power source line, a second switching section connected between the other input terminal supplied with the AC voltage and the first power source line, a third switching section connected between the one input terminal and a second power source line, and a fourth switching section connected between the other input terminal and the second power source line, both the first and second switching sections or both the third and fourth switching sections are concurrently turned on, forming a closed loop path between the one input terminal and the other input terminal, and thus the charge voltage at the voltage storage element is prevented from exceeding a withstand voltage of the voltage storage element, and the overcharging of the voltage storage element is avoided. Furthermore, since the voltage storage element is not shorted, no short-circuit current occurs, power stored in the voltage storage element is prevented from being consumed in vain, and the voltage storage element and a driven circuit are free from damage. Since a closed loop path, different from a charging path, is formed to allow a generated current to flow therethrough in order to prevent overcharge of the voltage storage element, circuit elements having low withstand voltages may be employed, facilitating the integration of the circuit. Since the closed loop path, formed between two input terminals corresponding to the two output terminals of a generator, applies short-circuit braking to the rotation of a rotor in the generator, the amplitude of a terminal voltage is automatically lowered, and the generation of electromagnetic noise in coils and the rotor in the generator is controlled. <IMAGE></p> |
