Patent US3601620A successfully refreshed from Google Patents.
US3601620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply
Assignee: ELECTRO PROUDCTS LAB Inc
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Filing: 1969-07-18
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Granted: 1971-08-24
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Expires: 1989-07-18
Abstract
Abstract An AC to DC power supply for a sensing system in which an oscillator responds to a condition being sensed and a detector connected with the output of the oscillator provides a signal utilized in a control or indicator. The detector is connected with the power supply through a transistor switch which responds to the source of voltage and has a time delay to prevent energization of the detector unless the oscillator is operating.
Inventors
- 👤 Gordon E Gee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/953; H03K17/9535; H03K17/951
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
In a sensing apparatus having an oscillator, the oscillatory condition of which is a function of the condition being sensed, a detector circuit responsive to the oscillatory condition of said oscillator, an output circuit connected with said detector, and a DC power supply for the oscillator and detector circuits, the improvement comprising: a source of DC power having an output; a connection from said output to said oscillator; a normally open switch means connected between said power source output and said detector circuit; and means responsive to the application of power by said power supply to said oscillator for thereafter closing said switch means after a predetermined time period has elapsed whereby said detector circuit cannot be energized until the oscillator has been permitted to stabilize so that the oscillatory condition of the oscillator cannot be detected during start-up of the same.
Claim 2
Dependent Claim
142 words
In a sensing apparatus having an oscillator, the oscillatory condition of which is a function of the condition being sensed, a detector circuit responsive to the oscillatory condition of said oscillator, an output circuit connected with said detector, and a DC power supply for the oscillator and detector circuits, the improvement comprising: a source of DC power having an output; a connection from said output to said oscillator; a normally open switch means connected between said power source output and said detector circuit; and means responsive to the application of power by said power supply to said oscillator for thereafter closing said switch means after a predetermined time period has elapsed whereby said detector circuit cannot be energized until the oscillator has been permitted to stabilize so that the oscillatory condition of the oscillator cannot be detected during start-up of the same.
Claim 3
Dependent Claim
20 words
The power supply of claim 1 in which said switch closing means is responsive to the voltage of said source.
Claim 4
Dependent Claim
18 words
The power supply of claim 1 in which said normally open switch means includes a voltage sensitive device.
Claim 5
Dependent Claim
16 words
The power supply of claim 3 in which said voltage sensitive device is a Zener diode.
Claim 6
Dependent Claim
16 words
The power supply of claim 1 in which said switch means includes a two-stage transistor switch.
Claim 7
Dependent Claim
48 words
The power supply of claim 1 in which said normally open switch means includes a transistor switch with an emitter-collector circuit connected across said source; and means for applying a potential to the base of said transistor to render the emitter-collector circuit conductive, including a resistance-capacitance charging circuit.
Claim 8
Dependent Claim
26 words
The power supply of claim 6 including a Zener diode connected across the capacitive element of said charging circuit and to the base of said transistor.
Claim 9
Dependent Claim
65 words
The power supply of claim 1 wherein said switch closing means is further operative to immediately open said switch in response to the deenergization of said power supply; and further including means for temporarily maintaining said oscillator in an operating condition upon the deenergization of said power supply whereby transient conditions during deenergization of the oscillator cannot cause an erroneous detection by said detector circuit.
Claim 10
Dependent Claim
105 words
The power supply of claim 1 wherein said switch means comprises at least one transistor and said switch closing means comprises a serial combination of a Zener diode and a resistor connected across the source and having their common junction connected to the base of the transistor, and a capacitor connected in parallel with said serial combination, whereby said transistor will not be turned on after the application of power to said oscillator until said capacitor is charged to a predetermined level, the charge on said capacitor further being operative to temporarily maintain said oscillator in an operative condition upon deenergization of said power supply.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |