Variable input voltage regulator circuit
First Claim
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1. A power supply comprising:
- a source of unregulated AC voltage having an amplitude between a first and a second level;
means for providing a voltage level representative of the amplitude of said unregulated AC voltage;
means responsive to said representative voltage level for producing an output signal when said representative voltage level is above a predetermined level corresponding to an unregulated AC voltage amplitude intermediate said first and second levels;
first rectifying means coupled to said unregulated AC voltage source for producing a first DC voltage from said AC voltage;
circuit means for forming a second rectifying means for producing a second DC voltage from said AC voltage when said circuit means is coupled to said first rectifying means;
switch means responsive to said output signal for coupling said circuit means to said first rectifying means when said unregulated AC voltage level is above said intermediate level comprising;
a bidirectional switch coupled to said first rectifying means and to said circuit means;
a first transistor coupled to said output signal producing means; and
a second transistor, regeneratively coupled to said first transistor and to said bidirectional switch, said first and second transistors cooperating to provide rapid switching of said bidirectional switch; and
regulator means responsive to said first or second DC voltage for providing a DC output voltage having a fixed regulated level with respect to variations in the level of said unregulated AC voltage between said first and second levels.
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Abstract
A power supply provides a regulated DC voltage level for a wide range of AC supply levels. The power supply incorporates circuitry which forms a voltage doubler or a full wave rectifier in response to the level of the AC supply voltage. The transition between the type of rectification is rapid, so that the regulated voltage remains constant.
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Citations
5 Claims
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1. A power supply comprising:
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a source of unregulated AC voltage having an amplitude between a first and a second level; means for providing a voltage level representative of the amplitude of said unregulated AC voltage; means responsive to said representative voltage level for producing an output signal when said representative voltage level is above a predetermined level corresponding to an unregulated AC voltage amplitude intermediate said first and second levels; first rectifying means coupled to said unregulated AC voltage source for producing a first DC voltage from said AC voltage; circuit means for forming a second rectifying means for producing a second DC voltage from said AC voltage when said circuit means is coupled to said first rectifying means; switch means responsive to said output signal for coupling said circuit means to said first rectifying means when said unregulated AC voltage level is above said intermediate level comprising; a bidirectional switch coupled to said first rectifying means and to said circuit means; a first transistor coupled to said output signal producing means; and a second transistor, regeneratively coupled to said first transistor and to said bidirectional switch, said first and second transistors cooperating to provide rapid switching of said bidirectional switch; and regulator means responsive to said first or second DC voltage for providing a DC output voltage having a fixed regulated level with respect to variations in the level of said unregulated AC voltage between said first and second levels. - View Dependent Claims (2, 3, 4, 5)
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Specification