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Regulated d.c. power supply

阅读：36发布：2023-12-17

专利汇可以提供Regulated d.c. power supply专利检索，专利查询，专利分析的服务。并且A switching-type regulating power supply which dissipates little power, minimizes radio frequency interference, and provides a constant DC output voltage has a full-wave rectifier with a regulating means in its common return circuit to switch the fullwave rectified current supplied to an output filter on and off. The current is switched on when there is zero voltage across the full-wave rectifier thus minimizing radio-frequency-interferencecausing surge currents, and this is accomplished by a phase synchronizer which is coupled to the input terminals of the fullwave rectifier and also coupled to the control means which applies a variable duty cycle control voltage to the regulating means. The control means is coupled to the output voltage filter and generates a variable duty cycle control voltage in response to changes in the DC output voltage of the supply. This varying duty cycle control voltage is applied to the regulating means to control the time in which the regulating means allows current to flow to the output filter which results in output voltage stabilization.，下面是Regulated d.c. power supply专利的具体信息内容。

权利要求

1. A regulated DC power supply comprising: a full-wave rectifier having input terminals adapted for connection to a source of AC line voltage; an output voltage filter coupled to said rectifier and having output terminals for connection to an external load; control means including a multivibrator having no more than one stable state for generating a square-wave control voltage having a predetermined nominal duty cycle; means including a transistor coupled to said input terminals of said full-wave rectifier and to said control means for detecting zero crossings of said AC line voltage and to provide trigger pulses in response to said detected zero crossings for phase-synchronizing said square-wave control voltage with said line voltage; means coupled to said output terminals and to said control means for varying said duty cycle inversely with changes in the DC output voltage developed at said output terminals; voltage regulating means coupled to said rectifier and responsive to an applied control voltage for stabilizing said output voltage; and means coupled to said control means for applying the variable-duty-cycle control voltage to said regulating means.

2. A switching-type regulated power supply which dissipates little power, minimizes radio frequency interference and provides a constant DC voltAge output comprising: a first full-wave rectifier comprising a pair of diodes having a common return circuit and having input terminals adapted for connection to a source of AC line voltage; an output voltage filter coupled to said first rectifier and having output terminals for connection to an external load; a multivibrator having no more than one stable state for generating a square-wave control voltage having a predetermined nominal duty cycle; means including a second full-wave rectifier and a transistor coupled to said input terminals of said first full-wave rectifier and to said multivibrator for detecting the zero-voltage crossings of the AC voltage across said first full-wave rectifier and to provide trigger pulses in response to said zero-voltage crossings for synchronizing the beginning of its duty cycle period with said zero-voltage crossings; means coupled to said output terminals and to said multivibrator for varying said duty cycle inversely with changes in the DC output voltage developed at said output terminals; voltage regulating means comprising a switch coupled in series with said common return circuit and said output terminals and responsive to an applied control voltage for stabilizing said output voltage; and means coupled to said multivibrator for applying the variable-duty-cycle control voltage to said switch to switch it on in synchronism with said zero-voltage crossings thereby to eliminate radio-frequency-interference-causing current surges.

3. A switching-type regulated power supply in accordance with claim 2, wherein said varying means comprises a zener diode in series with a variable impedance coupled from said output terminals to said control means.

4. A switching-type regulated power supply in accordance with claim 2, in which said multivibrator is powered by an auxiliary power supply coupled to said input terminals of said first full-wave rectifier, and in which said auxiliary power supply is unregulated for providing additional output voltage stabilization.

5. A switching-type regulated power supply in accordance with claim 2, wherein said switch included in said voltage regulating means comprises a transistor.

6. A switching-type regulated power supply in accordance with claim 2, wherein said switch included in said voltage regulating means comprises two transistors connected in a Darlington pair configuration.

7. A switching-type regulated power supply in accordance with claim 2, wherein said variable-duty-cycle control voltage applying means comprises an emitter follower.

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