US4504773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge circuit
Assignee: RADIO RESEARCH & TECHNICAL INC5-1-4 OHTSUKA BUNKYO-KU TOKYO JAPAN A CORP OF JAPAN
•
Filing: 1982-09-08
•
Granted: 1985-03-12
•
Expires: 2002-09-08
Abstract
Abstract A capacitor discharge circuit constructed by a combination of a mechanical switch and an electronic switch. The electronic switch is automatically turned on with a predetermined time delay after closing of the mechanical switch. The mechanical switch is used to completely separate a high voltage-large capacity capacitor from a load when the discharge operation is not required. The wear and tear of contacts in the mechanical switch can be avoided by the delayed operation of the electronic switch.
Inventors
- 👤 Seiichi Suzuki
- 👤 Eihachiro Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:03
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/54; H01H9/548; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3904; A61N1/39046; A61N1/3906; A61N1/3912; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
A capacitor discharge circuit for a defibrillator comprising: a mechanical switch having mechanical make-contact connected to the output of a capacitor which is charged by a DC high voltage source; an electronic switch connected in series to the output of the mechanical switch, the output of said electronic switch being connected to a load; a control signal generation circuit for generating a turn-on signal to be supplied to a control input of said electronic switch, said control signal generation circuit being connected to the output of said mechanical switch; and a DC isolating means for feeding a reduced operation voltage from the output of said mechanical switch to said control signal generation circuit with electrical isolation therebetween, wherein said control signal generation circuit is operated when said mechanical switch is turned on, and said electronic switch is turned on in turn in response to said turn-on signal generated in said control signal generation circuit.
Claim 2
Dependent Claim
154 words
A capacitor discharge circuit for a defibrillator comprising: a mechanical switch having mechanical make-contact connected to the output of a capacitor which is charged by a DC high voltage source; an electronic switch connected in series to the output of the mechanical switch, the output of said electronic switch being connected to a load; a control signal generation circuit for generating a turn-on signal to be supplied to a control input of said electronic switch, said control signal generation circuit being connected to the output of said mechanical switch; and a DC isolating means for feeding a reduced operation voltage from the output of said mechanical switch to said control signal generation circuit with electrical isolation therebetween, wherein said control signal generation circuit is operated when said mechanical switch is turned on, and said electronic switch is turned on in turn in response to said turn-on signal generated in said control signal generation circuit.
Claim 3
Dependent Claim
193 words
A capacitor discharge circuit for a defibrillator comprising: a mechanical switch having mechanical make-contact connected to the output of a capacitor which is charged by a DC high voltage source; an electronic switch connected in series to the output of the mechanical switch, the output of said electronic switch being connected to a load; a control signal generation circuit for generating a turn-on signal to be supplied to a control input of said electronic switch, said control signal generation circuit being connected to the output of said mechanical switch; a DC isolating means for feeding a reduced operation voltage from the output of said mechanical switch to said control signal generation circuit with electrical isolation therebetween; and a delay circuit for delaying said turn-on signal, the delay time of said delay circuit being a period longer than the chattering operation period of said mechanical switch; wherein said control signal generation circuit is operated when said mechanical switch is turned on, and said electronic switch is turned on after the chattering operation period is over in response to said turn-on signal generated in said control signal generation circuit and delayed by said delay circuit.
Claim 4
Dependent Claim
193 words
A capacitor discharge circuit for a defibrillator comprising: a mechanical switch having mechanical make-contact connected to the output of a capacitor which is charged by a DC high voltage source; an electronic switch connected in series to the output of the mechanical switch, the output of said electronic switch being connected to a load; a control signal generation circuit for generating a turn-on signal to be supplied to a control input of said electronic switch, said control signal generation circuit being connected to the output of said mechanical switch; a DC isolating means for feeding a reduced operation voltage from the output of said mechanical switch to said control signal generation circuit with electrical isolation therebetween; and a delay circuit for delaying said turn-on signal, the delay time of said delay circuit being a period longer than the chattering operation period of said mechanical switch; wherein said control signal generation circuit is operated when said mechanical switch is turned on, and said electronic switch is turned on after the chattering operation period is over in response to said turn-on signal generated in said control signal generation circuit and delayed by said delay circuit.
Claim 5
Dependent Claim
25 words
A capacitor discharge circuit according to claim 1 or 2, wherein the output of said electronic switch is directed to an electrode of said defibrillator.
Claim 6
Dependent Claim
19 words
The capacitor discharge circuit according to claim 1 or 2, wherein said mechanical switch means is an electromagnetic relay.
Claim 7
Dependent Claim
36 words
A capacitor discharge circuit according to claim 4, said relay comprises a pair of manually operated switches connected in series with each other, said manually operated switches being connected to an energizing circuit of said relay.
Claim 8
Dependent Claim
20 words
The capacitor discharge circuit according to claim 1 or 2, wherein said electronic switch means is a gate turn-off thyristor.
Claim 9
Dependent Claim
82 words
A capacitor discharge circuit according to claim 2, wherein said isolating means is a transformer having a primary winding connected to the output of said mechanical switch and a secondary winding for supplying a low voltage to said control signal generation circuit, and said delay circuit is a time-constant circuit comprising a resistor and a capacitor connected in series to said secondary winding of said transformer, an output of said time-constant circuit being fed to said electronic switch as said turn-on signal.
Claim 10
Dependent Claim
49 words
A capacitor discharge circuit according to claim 1 or 2 wherein said electronic switch is a light triggering type thyristor having a light sensitive gate, and said control signal generation circuit comprises a light emitting diode for generating a light to said light triggering thyristor as said turn-on signal.
References Cited (Backward Citations)
SU211028A1
Cited
US3440445A
Cited
GB1256638A
Cited
GB1343256A
Cited
GB1443324A
Cited
US4001610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |