US3852657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutation control for inverter circuit
Assignee: General Electric Co
•
Filing: 1973-11-19
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Granted: 1974-12-03
•
Expires: 1993-11-19
Abstract
Abstract An inverter circuit utilizing controlled rectifiers for changing direct current power to alternating current power is provided with control apparatus which includes means to sense variations in an operational parameter to provide compensation to insure that a current utilized to commutate or turn off a conducting rectifier is maintained substantially constant.
Inventors
- 👤 E Skogsholm
- 👤 J Tracy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:55
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
133 words
In an inverter circuit of the type including at least one pair of controlled rectifiers for supplying electrical power to a load from a direct current power source and means for storing an electrical charge which is controllably utilized to provide a commutation current to render a then conducting controlled rectifier nonconductive, means for controlling the time for rendering said controlled rectifiers conductive comprising: a. means for sensing the commutation current during the commutation of either one of the controlled rectifiers and to provide a first signal indicative thereof; b. means to provide a second signal indicative of a variable circuit parameter; and, c. means responsive to said first and second signals to initiate conduction of the other of said controlled rectifiers when said first and second signals are of a prescribed relationship.
Claim 2
Dependent Claim
133 words
In an inverter circuit of the type including at least one pair of controlled rectifiers for supplying electrical power to a load from a direct current power source and means for storing an electrical charge which is controllably utilized to provide a commutation current to render a then conducting controlled rectifier nonconductive, means for controlling the time for rendering said controlled rectifiers conductive comprising: a. means for sensing the commutation current during the commutation of either one of the controlled rectifiers and to provide a first signal indicative thereof; b. means to provide a second signal indicative of a variable circuit parameter; and, c. means responsive to said first and second signals to initiate conduction of the other of said controlled rectifiers when said first and second signals are of a prescribed relationship.
Claim 3
Dependent Claim
25 words
The invention in accordance with claim 1 wherein said means to provide the second signal is responsive to the value of the direct current source.
Claim 4
Dependent Claim
26 words
The invention in accordance with claim 1 wherein said means to provide the second signal is responsive to the value of current supplied to the load.
Claim 5
Dependent Claim
20 words
The invention in accordance with claim 1 wherein said prescribed relationship exists when said first and second signals are equal.
Claim 6
Dependent Claim
16 words
The invention in accordance with claim 1 wherein said second signal is substantially a ramp function.
Claim 7
Dependent Claim
30 words
The invention in accordance with claim 5 wherein the slope of the ramp function is determined by the amount of deviation of the variable circuit parameter from a predetermined value.
Claim 8
Dependent Claim
18 words
The invention in accordance with claim 6 wherein the variable circuit parameter is the direct current power source.
Claim 9
Dependent Claim
132 words
In an inverter circuit of the type including at least one pair of controlled rectifiers for supplying electrical power to a load from a direct current power source and means for storing an electrical charge which is controllably utilized to provide a commutation current to render a then conducting controlled rectifier nonconductive, means for controlling the time for rendering said controlled rectifiers conductive comprising: a. means to provide a first signal proportional to the commutation current during the commutation of either one of the controlled rectifiers; b. means to provide a second signal which varies at a rate governed by a variable circuit parameter; and, c. means to compare said first and second signals and to render a controlled rectifier conductive when said first and second signals are of a prescribed relationship.
Claim 10
Dependent Claim
132 words
In an inverter circuit of the type including at least one pair of controlled rectifiers for supplying electrical power to a load from a direct current power source and means for storing an electrical charge which is controllably utilized to provide a commutation current to render a then conducting controlled rectifier nonconductive, means for controlling the time for rendering said controlled rectifiers conductive comprising: a. means to provide a first signal proportional to the commutation current during the commutation of either one of the controlled rectifiers; b. means to provide a second signal which varies at a rate governed by a variable circuit parameter; and, c. means to compare said first and second signals and to render a controlled rectifier conductive when said first and second signals are of a prescribed relationship.
Claim 11
Dependent Claim
20 words
The invention in accordance with claim 8 wherein the variable parameter governing said second signal is the direct current source.
Claim 12
Dependent Claim
33 words
The invention in accordance with claim 8 wherein the means to provide the second signal includes a capacitor which is charged at a rate dependent upon the value of the variable circuit parameter.
Claim 13
Dependent Claim
25 words
The invention in accordance with claim 10 wherein the rate of capacitor charging increases as the effective potential of the direct current power source decreases.
Claim 14
Dependent Claim
106 words
A controlled inverter circuit operable from a variable direct current source to provide alternating current to a load comprising: a. a pair of controlled rectifiers selectively operable to supply electrical current from said source to said load; b. a commutation circuit including a capacitor for supplying commutation current for rendering a then conducting controlled rectifier nonconductive; c. means responsive to said commutation current to provide a first signal representative thereof; d. means to provide a second signal representative of a variable circuit parameter; and, e. means responsive to a predetermined relationship between said first and second signals for rendering the other of said controlled rectifiers conductive.
Claim 15
Dependent Claim
106 words
A controlled inverter circuit operable from a variable direct current source to provide alternating current to a load comprising: a. a pair of controlled rectifiers selectively operable to supply electrical current from said source to said load; b. a commutation circuit including a capacitor for supplying commutation current for rendering a then conducting controlled rectifier nonconductive; c. means responsive to said commutation current to provide a first signal representative thereof; d. means to provide a second signal representative of a variable circuit parameter; and, e. means responsive to a predetermined relationship between said first and second signals for rendering the other of said controlled rectifiers conductive.
Claim 16
Dependent Claim
19 words
The invention in accordance with claim 12 wherein the controlled rectifiers are silicon controlled rectifiers including a gating electrode.
Claim 17
Dependent Claim
28 words
The invention in accordance with claim 13 wherein the last mentioned means includes switching circuitry for supplying a pulse to the gating electrode of the silicon controlled rectifier.
Claim 18
Dependent Claim
25 words
The invention in accordance with claim 12 wherein the second signal varies in response to a change in the potential of the direct current source.
Claim 19
Dependent Claim
21 words
The invention in accordance with claim 12 wherein the second signal varies in response to the current supplied to said load.
Claim 20
Dependent Claim
15 words
The invention in accordance with claim 12 wherein said load is an alternating current motor.
Claim 21
Dependent Claim
32 words
The invention in accordance with claim 12 wherein said means to provide said second signal includes a capacitor and further includes means to vary the rate at which said capacitor is charged.
Claim 22
Dependent Claim
49 words
The invention in accordance with claim 12 said means to provide said second signal includes a capacitor, means to provide a feedback signal representing the potential of the direct current source, and means responsive to said feedback signal to vary the rate at which said additional capacitor is charged.
References Cited (Backward Citations)
US3207974A
Cited
US3641421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |