Patent US3867684A successfully refreshed from Google Patents.
US3867684A
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Pulse forming network charging control system
Assignee: Westinghouse Electric Corp
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Filing: 1973-09-07
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Granted: 1975-02-18
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Expires: 1993-09-07
Abstract
Abstract A pulse forming network (PFN) charge control system for controlling the DC supply voltage applied to a resonant charging system in a line type modulator. The circuitry utilized measures and computes the total energy stored at any instant supplied from the DC supply. When this energy reaches a predetermined value, the circuitry operates to block further flow of energy from the AC line source which powers the DC supply.
Inventors
- 👤 Howard S Ginsberg
- 👤 Charles K Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:20
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
206 words
Means for controlling the energy supplied to a pulse forming network in a line type modulator having a resonant charging system, comprising: a controlled source of charging current coupled to said line type modulator for supplying a charging current thereto to charge said pulse forming network; control means coupled to said controlled source for controlling the electrical energy supplied to said line type modulator; first circuit means coupled to said line type modulator and being operable to provide a signal proportional to the electrical energy stored in said line type modulator; and second circuit means coupled to said first circuit means and being responsive to said signal proportional to said stored energy and being operable to generate a control signal, said control signal being coupled to said control means, said control signal operating said control means during a charging mode of operation to render said controlled source operative and couple charging current to said line type modulator when said signal proportional to the stored energy in said line type modulator is below a predetermined value and operating said control means during a second mode of operation to render said controlled source inoperative and thereby interrupt charge current flow when said stored energy reaches a predetermined value.
Claim 2
Dependent Claim
206 words
Means for controlling the energy supplied to a pulse forming network in a line type modulator having a resonant charging system, comprising: a controlled source of charging current coupled to said line type modulator for supplying a charging current thereto to charge said pulse forming network; control means coupled to said controlled source for controlling the electrical energy supplied to said line type modulator; first circuit means coupled to said line type modulator and being operable to provide a signal proportional to the electrical energy stored in said line type modulator; and second circuit means coupled to said first circuit means and being responsive to said signal proportional to said stored energy and being operable to generate a control signal, said control signal being coupled to said control means, said control signal operating said control means during a charging mode of operation to render said controlled source operative and couple charging current to said line type modulator when said signal proportional to the stored energy in said line type modulator is below a predetermined value and operating said control means during a second mode of operation to render said controlled source inoperative and thereby interrupt charge current flow when said stored energy reaches a predetermined value.
Claim 3
Dependent Claim
38 words
The means as defined by claim 1 wherein said controlled source comprises a DC supply powered from an AC line source and wherein said control means comprises means controlling the AC power coupled to said DC supply source.
Claim 4
Dependent Claim
63 words
The means as defined by claim 2 wherein said DC supply comprises: transformer means having a primary circuit and a secondary circuit; rectifier circuit means coupled to said secondary circuit for providing a DC charging current to said line type modulator; and wherein said control means comprises a control element coupled to the primary circuit for controlling the current in said primary circuit.
Claim 5
Dependent Claim
143 words
The means as defined by claim 3 wherein said second circuit means includes: comparator circuit means having at least two inputs with one of said two inputs coupled to said first circuit means and being responsive to said signal proportional to the energy stored in said line type modulator and another input of said two inputs coupled to a reference voltage having an amplitude corresponding to a desired energy charge of said line type modulator and providing a first type output signal when said energy stored is below a predetermined value and a second type output signal when said energy stored is substantially equal to or exceeds said predetermined value; and third circuit means coupled to and responsive to said first and second type output signals from said comparator circuit and being operable to generate said control signal coupled to said control means.
Claim 6
Dependent Claim
160 words
The means as defined by claim 4 wherein said first circuit means comprises: current sensor means coupled in said line type modulator for providing an output signal proportional to the charging current of said resonant charging system; voltage sensor means coupled in said line type modulator providing a signal proportional to the voltage across said pulse forming network; first and second squaring circuit means respectively coupled to said current and voltage sensor means for providing a respective signal proportional to the square of the current and voltage; first and second multiplier circuit means respectively coupled to said first and second squaring circuit for respectively multiplying the squared current and voltage signals by a predetermined factor dependent on the inductance of the resonant charging system and the capacitance of the pulse forming network; and a summing circuit coupled to said multiplier circuit means providing a signal to said comparator circuit means proportional to the energy stored in said line type modulator.
Claim 7
Dependent Claim
68 words
The means as defined by claim 5 wherein said third circuit means includes: binary logic circuit means coupled to said comparator circuit means and being responsive to said first and second type output signals from said comparator circuit means for generating binary output signals; and fourth circuit means coupled to said logic circuit means and being operable to generate and couple said control signal to said control means.
Claim 8
Dependent Claim
106 words
The means as defined by claim 6 wherein said logic circuit means comprises: a two input AND logic gate having one input coupled to the output of said comparator circuit and the other input coupled to a system command signal; wherein said fourth circuit means comprises optical signal translation means coupled to the output of said AND gate and being operated thereby and an isolated drive circuit coupled to said optical signal translation means and being operable to couple said control signal to said control means; and wherein said control means comprises a transistor adapted to alternately pass and block AC current in said primary circuit.
Claim 9
Dependent Claim
164 words
The control circuit as defined by claim 4 wherein said second circuit means comprises: current sensor means in said line type modulator providing a signal proportional to the charging current of said line type modulator; voltage sensor means in said line type modulator providing a signal proportional to the voltage coupled to said line type modulator from said DC supply source; multiplier circuit means coupled to said current and voltage sensor means for providing a signal proportional to the product of said charging current and voltage coupled from said DC supply source; an integrator circuit coupled to the output of said multiplier and being operable over the charging period of said pulse forming network to provide a signal output which is proportional to the energy charge of said pulse forming network, said signal output being coupled to said comparator circuit; and integrator circuit reset means coupled to said integrator circuit for resetting the integrator circuit after each charge cycle of said pulse forming network.
Claim 10
Dependent Claim
68 words
The means as defined by claim 8 wherein said third circuit means includes: binary logic circuit means coupled to said comparator circuit means and being responsive to said first and second type output signals from said comparator circuit means for generating binary output signAls; and fourth circuit means coupled to said logic circuit means and being operable to generate and couple said control signal to said control means.
Claim 11
Dependent Claim
106 words
The means as defined by claim 9 wherein said logic circuit means comprises: a two input AND logic gate having one input coupled to the output of said comparator circuit and the other input coupled to a system command signal; wherein said fourth circuit means comprises optical signal translation means coupled to the output of said AND gate and being operated thereby and an isolated drive circuit coupled to said optical signal translation means and being operable to couple said control signal to said control means; and wherein said control means comprises a transistor adapted to alternately pass and block AC current in said primary circuit.
References Cited (Backward Citations)
US3065399A
Cited
US3119968A
Cited
US3139585A
Cited
US3452266A
Cited
US3551786A
Cited
US3541421A
Cited
US3514689A
Cited
US3621274A
Cited
US3774054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |