Power supply with minimal dissipation output stage
First Claim
1. An electrical power supply comprising a regulation stage having an input and an output, the regulation stage being supplied at its input with a dc input voltage with a significant ripple component, the regulation stage including means to provide at its output an output voltage at a level essentially equal to the input voltage value occurring at troughs of the ripple component.
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Accused Products
Abstract
An electrical power supply is provided with a regulation stage which on being supplied at its input with a dc input voltage with a significant ripple component (VS1.sbsb.--OUT), outputs a dc output voltage (VS2.sbsb.--OUT) at a level substantially equal to the dc input voltage value at the troughs of the input ripple component (VT). As a result of this operation, the power dissipated in the stage is minimized. In order to regulate the dc output voltage (VS2.sbsb.--OUT) to be at a particular level, this output voltage is compared to a reference to produce a control signal (S) that is fed back to an upstream regulation stage. This upstream stage then serves to vary the level of the trough voltage at the input of the downstream regulation stage.
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Citations
16 Claims
- 1. An electrical power supply comprising a regulation stage having an input and an output, the regulation stage being supplied at its input with a dc input voltage with a significant ripple component, the regulation stage including means to provide at its output an output voltage at a level essentially equal to the input voltage value occurring at troughs of the ripple component.
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7. An electrical power supply comprising:
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a first regulation stage for producing in output an intermediate dc voltage with a significant ripple component, said first regulation stage being responsive to a control input fed thereto to vary the mean value of said intermediate dc voltage thereby to cause the level of the troughs of said ripple component to change, a second regulation stage having an input and an output, the second regulation stage being connected to receive at its input said intermediate dc voltage output by the first regulation stage and being operative to provide at its output a dc output voltage at a level having a fixed relation to the value of said intermediate dc voltage at the troughs of said ripple component, and loop control means for comparing said dc output voltage produced by said second regulation stage with a reference, and for generating said control input such that said first regulation stage adjusts its mean value to a level causing said dc output voltage to settle at a level set by said reference.
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12. A method of regulating a dc input voltage, the dc input voltage having a significant ripple component wherein minimum input voltage values are trough values which occur during troughs of the input voltage, said method comprising the steps of:
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detecting the trough values; and providing an output voltage essentially equal to the trough values offset by a constant value. - View Dependent Claims (13, 14, 15, 16)
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Specification