US3829754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated adjustable frequency power supply of the inverter type
Assignee: ALLIS L CO
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Filing: 1973-01-08
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Granted: 1974-08-13
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Expires: 1993-01-08
Abstract
Abstract A power supply of the inverter type for controlling the operative condition of an alternating current load includes a power source providing an output having a predetermined ripple component. An inverter is connected in series with the power source for providing variable frequency energization to the load. This variable frequency energization generates a variable frequency ripple component, the effects of which on the power source are minimized by a sensing means which accentuates the power source''s own ripple. A rate transformer may be used for this purpose.
Inventors
- 👤 C Rettig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:52
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
305 words
A power supply interposible between a source of electrical energy and the terminals of an alternating current device for effecting variable frequency current energization in the device to control the operative condition thereof, said power supply comprising: a power source having an input connectable to said electrical energy source and including a controllable means for providing a unipolarity output voltage having a predetermined ripple component established by the operation of said controllable means and a unidirectional current at the output of said power source; current regulating circuitry coupled to said power source for regulating the unidirectional output current to substantially a desired magnitude; an inductor connected to the output of said power source, said inductor having inductive characteristics sufficient to stabilize the current regulation of the power source and forming, with said power source, a unidirectional current source; an inverter of the current transfer type having an input connected to said unidirectional current source and an output connectable to the terminals of said alternating current device, said inverter having at least a pair of parAllel current paths between the input and output of the inverter each of which includes current transfer control means for providing variable frequency current energization in the alternating current device, said energization generating a voltage including a variable frequency ripple component which is applied to said unidirectional current source; and sensing means coupled in the output of said power source and to said current regulating circuitry for detecting the ripple component of the unipolarity output voltage of the power source and for applying same to said current regulating circuitry for accentuating the ripple component of the unipolarity output voltage in the current regulation of the power source thereby to minimize the effect of the variable frequency ripple component of the inverter generated voltage on the current regulation of the power source.
Claim 2
Dependent Claim
305 words
A power supply interposible between a source of electrical energy and the terminals of an alternating current device for effecting variable frequency current energization in the device to control the operative condition thereof, said power supply comprising: a power source having an input connectable to said electrical energy source and including a controllable means for providing a unipolarity output voltage having a predetermined ripple component established by the operation of said controllable means and a unidirectional current at the output of said power source; current regulating circuitry coupled to said power source for regulating the unidirectional output current to substantially a desired magnitude; an inductor connected to the output of said power source, said inductor having inductive characteristics sufficient to stabilize the current regulation of the power source and forming, with said power source, a unidirectional current source; an inverter of the current transfer type having an input connected to said unidirectional current source and an output connectable to the terminals of said alternating current device, said inverter having at least a pair of parAllel current paths between the input and output of the inverter each of which includes current transfer control means for providing variable frequency current energization in the alternating current device, said energization generating a voltage including a variable frequency ripple component which is applied to said unidirectional current source; and sensing means coupled in the output of said power source and to said current regulating circuitry for detecting the ripple component of the unipolarity output voltage of the power source and for applying same to said current regulating circuitry for accentuating the ripple component of the unipolarity output voltage in the current regulation of the power source thereby to minimize the effect of the variable frequency ripple component of the inverter generated voltage on the current regulation of the power source.
Claim 3
Dependent Claim
53 words
The power supply according to claim 1 wherein said ripple component sensing means provides a feedback signal corresponding to the ripple component of the unipolarity output voltage of the power source to said current regulating circuitry and wherein said current regulating circuitry is responsive to said feedback signal and controls said controllable means.
Claim 4
Dependent Claim
77 words
The power supply according to claim 2 wherein said current regulating circuitry includes a current reference signal means, a current feedback signal means providing a current feedback signal and a comparison means coupled to said reference signal means and current feedback signal means and to said power source for regulating the unidirectional output current to substantially a desired magnitude and wherein said ripple component sensing means is further defined as coupled to said current feedback signal means.
Claim 5
Dependent Claim
33 words
The power supply according to claim 1 wherein said ripple component sensing means is further defined as a means for detecting the rate of change of the output voltage of the power source.
Claim 6
Dependent Claim
40 words
The power supply according to claim 4 wherein said ripple component sensing means includes a voltage rate transformer having a primary winding coupled in the output of the power source and a secondary winding coupled to said current regulating circuitry.
Claim 7
Dependent Claim
69 words
The power supply according to claim 1 further including inverter voltage sensing means coupled to the input of the inverter and to said current regulating circuitry for sensing the inverter generated voltage impressed on said current source and for providing compensation to the current regulation of the power source for reducing the effect of the generated voltage on the provision of said unidirectional output current by said power source.
Claim 8
Dependent Claim
87 words
The power source according to claim 5 further including inverter voltage sensing means coupled to the input of the inverter and to said current regulating circuitry for sensing the inverter generated voltage impressed on said current source and for providing compensation to the current regulation of the power source for reducing the effect of the generated voltage on the provision of said unidirectional output current by said power source, said voltage sensing means comprising a winding in said rate transformer coupled to the input of said inverter.
Claim 9
Dependent Claim
59 words
The power supply according to claim 1 wherein the electrical energy source is an A.C. voltage source having a frequency characteristic and wherein said power source includes a controllable rectifying means for providing a unipolarity output voltage having a ripple component determined by the A.C. voltage frequency characteristic and a unidirectional current at the output of said power source.
Claim 10
Dependent Claim
34 words
The power supply according to claim 1 wherein the electric energy source is a direct current source and wherein said power source includes controllable direct current voltage means connectable to the direct current source.
Claim 11
Dependent Claim
54 words
The power supply according to claim 9 wherein said controllable direct current voltage means comprises chopper circuitry and wherein the output current maintaining characterIstics of said inductor are frequency responsive and wherein said chopper is constructed to provide a pulsating output having a frequency selected to retain the current maintaining characteristics of said inductor.
Claim 12
Dependent Claim
135 words
The power supply according to claim 1 for effecting variable frequency current energization in a device capable of operating as an electrical load and as an electrical source, the change from operation of the device as a load to operation as a source being accompanied by a reversal of the voltage polarity in the power supply and wherein said unidirectional current source is so constructed as to provide said unidirectional current of substantially a desired magnitude regardless of the polarity of the voltage impressed on the output of said power source, whereby said power supply may supply current energization of a periodic type from the electrical energy source to the alternating current device as a load and supply energization from the alternating current device as a source to the electrical energy source as a load.
Claim 13
Dependent Claim
20 words
The power supply according to claim 1 wherein said inverter is further defined as a diode isolated, capacitor commutated inverter.
Claim 14
Dependent Claim
34 words
The power supply according to claim 1 having a plurality of inverters of the current transfer type connectable to said unidirectional current source for providing variable frequency current energization in the alternating current device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |