US4028633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive control to prevent simultaneous conduction in push-pull switching amplifier
Assignee: United States Department of the Navy
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Filing: 1976-07-19
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Granted: 1977-06-07
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Expires: 1996-07-19
Abstract
Abstract A drive circuit responsive to the phase of the amplifier output current eres that the non-conducting amplifier element remains off while the other amplifier element conducts. The output current phase can be detected either from the individual amplifier element outputs or from their combined outputs. Adjustments are made to compensate for any phase shift which occurs between the input to the amplifier and the point in the output at which the phase is detected.
Inventors
- 👤 Jimmy Dale Rogers
- 👤 Michael Earl Creecy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/20; H03F3/21; H03F3/217
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
189 words
A push-pull amplifier comprising: an input signal source; first and second switching amplifier elements coupled to said input signal source and an output providing output current signals; means for inverting said input signal to said first switching amplfier element 180° relative to said input signal applied to said second switching amplifier element; first drive means coupling the inverted input signal to said first switching amplifier element, and second drive means coupling said input signal to said second switching amplifier element, said first switching amplifier element conducting said inverted input signal only when said first drive means is enabled, and said second switching amplifier element conducting said input signal only when said second drive means is enabled; phase detection means to detect the phase of said output current signals; and control means coupled to said phase detection means to provide control signals to enable one of said first and second drive means to conduct while inhibiting the other of said first and second drive means; whereby said first and second switching amplifier elements will be prevented from simultaneous conduction and will conduct said input signal alternately at approximately 180° intervals.
Claim 2
Dependent Claim
189 words
A push-pull amplifier comprising: an input signal source; first and second switching amplifier elements coupled to said input signal source and an output providing output current signals; means for inverting said input signal to said first switching amplfier element 180° relative to said input signal applied to said second switching amplifier element; first drive means coupling the inverted input signal to said first switching amplifier element, and second drive means coupling said input signal to said second switching amplifier element, said first switching amplifier element conducting said inverted input signal only when said first drive means is enabled, and said second switching amplifier element conducting said input signal only when said second drive means is enabled; phase detection means to detect the phase of said output current signals; and control means coupled to said phase detection means to provide control signals to enable one of said first and second drive means to conduct while inhibiting the other of said first and second drive means; whereby said first and second switching amplifier elements will be prevented from simultaneous conduction and will conduct said input signal alternately at approximately 180° intervals.
Claim 3
Dependent Claim
43 words
A push-pull amplifier as set forth in claim 1 wherein said control means further comprises phase correction means to adjust said control signals to compensate for phase shift which occurs between said input and output of said first and second switching amplifier elements.
Claim 4
Dependent Claim
117 words
A push-pull amplifier as set forth in claim 2 wherein said phase correction means comprises: a phase shift detector having its inputs coupled to measure the voltages at the inputs and outputs to said first and second switching amplifier means, said phase shift detector providing an output pulse whose width is indicative of the voltage delay between said measured voltages; and control logic means coupled by its input to said phase shift detector and by its output to said phase detection means, said control logic means integrating said pulse output of said phase shift detector to control said phase detection means to offset the phase of said output current signals in accordance with the measured voltage delay.
Claim 5
Dependent Claim
39 words
A push-pull amplifier as set forth in claim 3 wherein said phase shift detector comprises EXCLUSIVE OR circuits which provide an output if and only if one of the input and output voltage signals which it monitors is present.
Claim 6
Dependent Claim
85 words
A push-pull amplifier as set forth in claim 2 further comprising: means for combining the output current signals of said first and second switching amplifier elements to provide an output current signal I o ; and sensor means coupling the output current signals of said first and second switching amplifier elements to said phase detector means at points prior to the means for combining whereby the phase correction means is responsive to the individual non-combined output currents of said first and second switching amplifier elements.
Claim 7
Dependent Claim
40 words
A push-pull amplifier as set forth in claim 5 wherein said control means switches the drive between said first and second drive means when said phase detector indicates a zero-crossing of the phase of either of said output current signals.
Claim 8
Dependent Claim
117 words
A push-pull amplifier as set forth in claim 5 wherein said phase correction means comprises: a phase shift detector having its inputs coupled to measure the voltages at the inputs and outputs to said first and second switching amplifier means, said phase shift detector providing an output pulse whose width is indicative of the voltage delay between said measured voltages; and control logic means coupled by its input to said pulse shift detector and by its output to said phase detection means, said control logic means integrating said pulse output of said phase shift detector to control said phase detection means to offset the phase of said output current signals in accordance with the measured voltage delay.
Claim 9
Dependent Claim
39 words
A push-pull amplifier as set forth in claim 7 wherein said phase shift detector comprises EXCLUSIVE OR circuits which provide an output if and only if one of the input and output voltage signals which it monitors is present.
Claim 10
Dependent Claim
68 words
A push-pull amplifier as set forth in claim 1 further comprising: means for combining the output current signals of said first and second switching amplifier elements to provide an output current signal I o ; and sensor means coupling the output of said combining means to said phase detection means whereby said phase detection means is responsive to the phase of said output current signal I o .
Claim 11
Dependent Claim
41 words
A push-pull amplifier as set forth in claim 9 wherein said control means switches the drive between said first and second drive means when said phase detector indicates a zero-crossing of the phase of the output current signal I o .
Claim 12
Dependent Claim
44 words
A push-pull amplifier as set forth in claim 9 wherein said control means further comprises phase correction means to adjust said control signals to compensate for phase shift which occurs between the inputs to said first and second switching amplifier elements output sensor means.
Claim 13
Dependent Claim
119 words
A push-pull amplifier as set forth in claim 11 wherein said phase correction means comprises: a phase shift detector having its inputs coupled to measure the voltages at the inputs to said first and second switching amplifier means and said output sensor means, said phase shift detector providing an output pulse whose width is indicative of the voltage delay between said measured voltages; and control logic means coupled by its input to said phase detector and by its output to said phase detection means, said control logic means integrating said pulse output of said phase shift detector to control said phase detection means to offset the phase of said output current signals in accordance with the measured voltage delay.
Claim 14
Dependent Claim
39 words
A push-pull amplifier as set forth in claim 12 wherein said phase shift detector comprises EXCLUSIVE OR circuits which provide an output if and only if one of the input and output voltage signals which it monitors is present.
Claim 15
Dependent Claim
45 words
A push-pull amplifier as set forth in claim 9 wherein said combining means comprises an output transformer having a primary coil coupled to the outputs of said first and second switching amplifier elements, and a secondary coil providing said output current signal I o .
References Cited (Backward Citations)
US3825773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |