US3876922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient responsive compensation circuit for an inverter arrangement
Assignee: Siemens AG
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Filing: 1973-11-21
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Granted: 1975-04-08
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Expires: 1993-11-21
Abstract
Abstract A circuit for use in an inverter arrangement of the type which feeds a load through at least one filter having an essentially constant a-c output voltage. The present circuit is arranged so that the d-c input to the inverter is shunted by a series circuit comprising a switch and a storage capacitor and includes an auxiliary d-c source for charging the storage capacitor to a voltage higher than the d-c input voltage of the inverter so that closing the switch will impress on the inverter input a d-c voltage of the same polarity but at a higher level enabling the circuit to compensate for transient reactances caused in the filter due to load surges. In the preferred embodiment, a d-c control circuit is used as the switch.
Inventors
- 👤 Wilhelm Forstbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/49; H02M7/505; H02M7/515; H02M7/525
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
A circuit for use with an inverter arrangement of the type which feeds a load through at least one filter providing to said load a constant ac output voltage, said circuit comprising: a. a series circuit comprising a switch and a storage capacitor shunted across the d-c input of the arrangement; b. means to charge the storage capacitor to a d-c voltage which is higher than the normal d-c input voltage of the arrangement but which which will be at the same polarity as said normal input voltage when said switch is closed c. means for closing said switch responsive to a voltage dip at the output of said filter, said voltage dip being of short duration and being caused by a transient reactance which becomes effective in said filter when a load surge occurs at the output of said filter, and d. means for opening said switch responsive to the magnitude of the a-c output current of said filter, thereby compensating for said voltage dip at the output of said filter during the "on" duration of said switch.
Claim 2
Dependent Claim
179 words
A circuit for use with an inverter arrangement of the type which feeds a load through at least one filter providing to said load a constant ac output voltage, said circuit comprising: a. a series circuit comprising a switch and a storage capacitor shunted across the d-c input of the arrangement; b. means to charge the storage capacitor to a d-c voltage which is higher than the normal d-c input voltage of the arrangement but which which will be at the same polarity as said normal input voltage when said switch is closed c. means for closing said switch responsive to a voltage dip at the output of said filter, said voltage dip being of short duration and being caused by a transient reactance which becomes effective in said filter when a load surge occurs at the output of said filter, and d. means for opening said switch responsive to the magnitude of the a-c output current of said filter, thereby compensating for said voltage dip at the output of said filter during the "on" duration of said switch.
Claim 3
Dependent Claim
17 words
The circuit according to claim 1 wherein an extinguishable semiconductor rectifier means is provided as the switch.
Claim 4
Dependent Claim
15 words
The invention according to claim 1 wherein said switch comprises a d-c current control circuit.
Claim 5
Dependent Claim
28 words
The invention according to claim 3 wherein said d-c control circuit includes a quenching capacitor and further including a charging resistor coupling said quenching capacitor to said capacitor.
Claim 6
Dependent Claim
35 words
The invention according to claim 3 wherein said d-c current control circuit includes a saturable choke in the discharge current path of said storage capacitor for limiting the rate of current rise in said switch.
Claim 7
Dependent Claim
30 words
The invention according to claim 2 and further including a saturable choke in the discharge path of said storage capacitor for limiting the rate of current rise in said switch.
Claim 8
Dependent Claim
25 words
The invention according to claim 5 and further including a decoupling rectifier in series with the series circuit comprising said switch and said storage capacitor.
Claim 9
Dependent Claim
38 words
The invention according to claim 1 wherein said means for charging said storage capacitor comprise a step-up transformer coupled to the a-c output voltage of said inverter arrangement and a rectifier coupled to the output of said transformer.
Claim 10
Dependent Claim
30 words
The invention according to claim 1 wherein said means for closing said switch comprise means responsive to the magnitude of the increase of the a-c output current of said filter.
Claim 11
Dependent Claim
49 words
The invention according to claim 1 wherein the "on" duration of said switch is a function of the increase of the magnitude of the a-c output current of said filter, in the sense that an increase of the a-c output current leads to a lengthening of the "on duration.
Claim 12
Dependent Claim
23 words
The invention according to claim 1 wherein the time of closing said switch is derived from the a-c output current of said filter.
Claim 13
Dependent Claim
69 words
The invention according to claim 1 wherein said inverter arrangement includes two controlled inverters having output voltages respectively advanced and retarded in time with respect to a synchronization signal, the degree of advancement and retardation being the same absolute value for each, with the output voltages of said inverters being superimposed in a transformer circuit to form an overall output voltage which is fed to a load through filters.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |