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EP0284412A2
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EP
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Automatic voltage switching power source
Assignee: FDK Corp
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Filing: 1988-03-25
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Granted: —
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Expires: 2008-03-25
Abstract
Abstract An automatic voltage switching power source has a controller (18) which comprises a plurality of voltage level detectors (22, 24) which are associated with an input ac voltage and detect different voltages, and a switching signal generator (30) which generates a delayed signal for switching the switch (14) based on the logical product of the outputs of the voltage level detectors, thereby preventing the electric circuit of the power source and the electric device to be supplied with the power from being damaged by excessively high voltages.
Inventors
- 👤 Fumiaki Nakao
- 👤 Noboru Kato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 07:54
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/04; H; H02; H02M; H02M1/00; H02M1/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
An automatic voltage switching power source comprising a rectifying circuit having both of voltage doubler rectification and full-wave rectification functions, a switch means for switching the voltage doubler rectification and the full-wave rectification functions of said rectifying circuit, and a control means for controlling said switch means in accordance with a value of an input ac voltage to said rectifying circuit, wherein said control means comprises: a plurality of voltage level detector means associated with said input ac voltage and adapted to detect different voltages; and a switching signal generator means for generating a delayed signal for switching said switch means based on the logical product of the outputs of said plurality of voltage level detector means.
Claim 2
Dependent Claim
117 words
An automatic voltage switching power source comprising a rectifying circuit having both of voltage doubler rectification and full-wave rectification functions, a switch means for switching the voltage doubler rectification and the full-wave rectification functions of said rectifying circuit, and a control means for controlling said switch means in accordance with a value of an input ac voltage to said rectifying circuit, wherein said control means comprises: a plurality of voltage level detector means associated with said input ac voltage and adapted to detect different voltages; and a switching signal generator means for generating a delayed signal for switching said switch means based on the logical product of the outputs of said plurality of voltage level detector means.
Claim 3
Dependent Claim
54 words
An automatic voltage switching power source as claimed in claim 1, wherein each said voltage level detector means comprises a means for comparing the voltage provided by rectifying said input ac voltage with a reference voltage and for generating a pulse when the instantaneous value of said voltage is higher than said reference voltage.
Claim 4
Dependent Claim
36 words
An automatic voltage switching power source as claimed in claim 2, wherein said reference voltages for said plurality of voltage level detector means are supplied by dividing the output of a single constant voltage generating means.
Claim 5
Dependent Claim
39 words
An automatic voltage switching power source as claimed in claim 3, wherein said constant voltage generating means comprises a constant voltage generating circuit which outputs a constant voltage with an input voltage provided by rectifying said input ac voltage.
Claim 6
Dependent Claim
31 words
An automatic voltage switching power source as claimed in claim 2, wherein said voltage level detector means comprises a first voltage level detector means and a second voltage level detector means.
Claim 7
Dependent Claim
36 words
An automatic voltage switching power source as claimed in claim 5, wherein said comparing and pulse generating means of said first and said second voltage level detector means include first and second comparators with hysteresis, respectively.
Claim 8
Dependent Claim
43 words
An automatic voltage switching power source as claimed in claim 6, wherein said first voltage level detector means further includes a third comparator adapted to generate a pulse when said first comparator does not generate a pulse for a predetermined period of time.
Claim 9
Dependent Claim
80 words
An automatic voltage switching power source as claimed in claim 7, wherein said switching signal generator means includes a capacitor adapted to be selectively charged by the outputs of said third comparator of said first voltage level detector means and said second comparator of said second voltage level detector means, and a fourth comparator for comparing the terminal voltage of said capacitor with a reference voltage and generating a pulse when said terminal voltage becomes higher than said reference voltage.
Claim 10
Dependent Claim
53 words
An automatic voltage switching power source as claimed in claim 8, wherein said switching signal generator means further includes a transistor adapted to turn on or off correspondingly to the output of said fourth comparator, and a photodiode connected to said transistor and supplied with a current when said transistor is turned on.
Claim 11
Dependent Claim
28 words
An automatic voltage switching power source as claimed in claim 9, wherein said current for said photodiode is supplied from said constant voltage generating circuit through said transistor.
Claim 12
Dependent Claim
59 words
An automatic voltage switching power source as claimed in claim 10, wherein said switch means comprises a triac and a phototriac connected in parallel, said phototriac turning on by the photoexcitation of said photodiode, and said triac becoming conductive when a turn-on voltage is applied to the gate thereof by the turn-on of said phototriac, thereby closing the switch.
References Cited (Backward Citations)
No citation records indexed.
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