Patent EP0580919A1 successfully refreshed from Google Patents.
EP0580919A1
Expired / Lapsed
EP
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Frequency modulated switching power supply
Assignee: STMicroelectronics SRL
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Filing: 1992-07-28
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Granted: —
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Expires: 2012-07-28
Abstract
Abstract A switching-type power supply circuit for direct connection to an AC outlet is provided with a circuit for modulating the switching frequency in an inversely proportional relationship with the instantaneous amplitude of the rectified RC voltage, suitably "normalized" in relation to its effective RMS value. By reducing the switching frequency under conditions of relatively high switching current, attenuates the switching noise and reduces power losses.
Inventors
- 👤 Bruno Ferrario
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:39
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4225; H03; H03K; H03K7/00; H03K7/06; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
A switching-type power supply for direct connection to an AC power distribution network, characterized by having a switching frequency which is inversely proportional to the instantaneous amplitude of a rectified AC voltage.
Claim 2
Dependent Claim
88 words
A switching-type power supply for direct connection to an AC power distribution network, comprising a voltage ramp type oscillator, the frequency of oscillation of which is determined by a charge current and a discharge current of a capacitance, characterized by comprising a circuit capable of varying said charge and discharge currents in an inversely proportional relationship with the instantaneous amplitude of a rectified AC voltage, thus modulating said oscillation frequency in an inversely proportional relationship with said instantaneous amplitude of the rectified AC voltage of said distribution network.
Claim 3
Dependent Claim
137 words
A switching-type power supply as defined in Claim 2, wherein said circuit comprises a divider circuit having a first and a second input and an output, the first input being connected to the output node of a low-pass filter connected in cascode to a rectifier circuit of said AC voltage, the second input being connected to an intermediate node of a voltage divider functionally connected to the output of said rectifier circuit and the output node being functionally connected to the output node of a generator of said charge and discharge currents; said circuit producing through said output a current proportional to a signal representative of the instantaneous value of the rectified AC voltage, present on said first input, divided by a voltage representative of an RMS value of said AC voltage, present on said second input.
References Cited (Backward Citations)
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