US4698743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonance inverter with control means for detecting peak voltage and having a starting circuit
Assignee: Toshiba Corp
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Filing: 1986-09-24
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Granted: 1987-10-06
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Expires: 2006-09-24
Abstract
Abstract A resonance inverter includes a DC power source, a resonance capacitor, an inductor, and a plurality of semiconductor switches. The resonance capacitor and inductor form a parallel resonant circuit. The inverter further includes control means for detecting a peak value of the voltage across the resonance capacitor, and for alternately conducting said semiconductor switches with a certain lead phase with respect to the peak point of the capacitor terminal voltage.
Inventors
- 👤 Toshihiro Onodera
- 👤 Youichi Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:44
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523; H02M7/5233; H02M7/5236; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/305; H02M3/315
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A resonance inverter comprising: a resonance capacitor; an inductor connected in parallel with said resonance capacitor, to form a parallel resonant circuit; at least two semiconductor switches provided between said resonance capacitor and said DC power source, to control the charge/discharge of said capacitor; and control means to alternately render conductive said semiconductor switches, with a certain lead phase difference with respect to the peak point of a peak value of the voltage across said resonance capacitor; said control means including: reference voltage generating means for generating the peak value of the voltage across said resonance capacitor, and producing a reference voltage, which is lower than said peak value, but proportional to said peak value; comparing means for comparing said reference voltage and said capacitor terminal voltage, and producing pulses with a predetermined lead phase difference with respect to said terminal voltage; and switch drive means for generating trigger pulses to render said switches conductive in response to the output pulse from said comparing means.
Claim 2
Dependent Claim
165 words
A resonance inverter comprising: a resonance capacitor; an inductor connected in parallel with said resonance capacitor, to form a parallel resonant circuit; at least two semiconductor switches provided between said resonance capacitor and said DC power source, to control the charge/discharge of said capacitor; and control means to alternately render conductive said semiconductor switches, with a certain lead phase difference with respect to the peak point of a peak value of the voltage across said resonance capacitor; said control means including: reference voltage generating means for generating the peak value of the voltage across said resonance capacitor, and producing a reference voltage, which is lower than said peak value, but proportional to said peak value; comparing means for comparing said reference voltage and said capacitor terminal voltage, and producing pulses with a predetermined lead phase difference with respect to said terminal voltage; and switch drive means for generating trigger pulses to render said switches conductive in response to the output pulse from said comparing means.
Claim 3
Dependent Claim
38 words
A resonance inverter according to claim 1, in which said reference voltage generating means includes a peak hold circuit for holding said peak voltage, and attenuating means for attenuating said peak voltage held by said peak hold circuit.
Claim 4
Dependent Claim
16 words
A resonance inverter according to claim 2, in which said attenuating means is a voltage divider.
Claim 5
Dependent Claim
82 words
A resonance inverter according to claim 1, in which said control means comprises peak detecting means for detecting the peak value of said capacitor terminal voltage, pulse generating means for generating pulses with a predetermined lead phase angle with respect to the peak point of said terminal voltage on the basis of the detection results from said peak detecting means, switch drive means for generating trigger pulses to render conductive said switches in response to the output of said pulse generating means.
Claim 6
Dependent Claim
14 words
A resonance inverter according to claim 1, in which said semiconductor switches are thyristors.
Claim 7
Dependent Claim
41 words
A resonance inverter according to claim 1, in which said semiconductor switches are two semiconductor switches forming a push-pull inverter in which said switches are selectively conducted, to apply an inverse voltage from said DC power source to said resonance capacitor.
Claim 8
Dependent Claim
26 words
A resonance inverter according to claim 1, in which said semiconductor switches are four semiconductor switches connected in a bridge fashion to form a bridge inverter.
Claim 9
Dependent Claim
24 words
A resonance inverter according to claim 1, in which said inductor includes inductance of an output transformer for supplying the output to a load.
Claim 10
Dependent Claim
20 words
A resonance inverter according to claim 1, further comprising a choke coil connected in series to the DC power source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |