US3617864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state phase control panel
Assignee: Individual
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Filing: 1970-05-18
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Granted: 1971-11-02
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Expires: 1990-05-18
Abstract
Abstract An air-cooled phase control panel, including two controlled rectifiers, is designed to supply regulated amounts of power to a heavy industrial load such as a resistance welding unit. A trigger delay capacitor limits the power initially supplied to the load and protects the controlled rectifiers from starting transient currents. This trigger delay capacitor makes it possible to use high-speed overcurrent circuit breakers in series with the controlled rectifiers. A voltage breakdown device connected between the trigger terminals of the rectifiers protects the rectifiers from voltage transients. A trigger pulse amplifying and peaking circuit insures that the controlled rectifiers are rendered fully conductive in the minimum possible time and thus prevents any localized thermal destruction from occurring within the controlled rectifiers. Both single and multiple-phase embodiments are disclosed.
Inventors
- 👤 David J Senger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:29
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; H02H; H02H7/00; H02H7/10; H02H7/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
153 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; at least one controlled conduction device having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said controlled conduction device; a relaxation oscillator having power input terminals and having a pulse output connected to the trigger terminal of the controlled conduction device; resistive means; a rectifier; a second series circuit comprising the rectifier, the resistive means, and the power input terminals of said relaxation oscillator connected across said alternating current source of potential; a third series circuit comprising a capacitor and a diode conNected across the power input terminals of said relaxation oscillator; and switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge.
Claim 2
Dependent Claim
153 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; at least one controlled conduction device having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said controlled conduction device; a relaxation oscillator having power input terminals and having a pulse output connected to the trigger terminal of the controlled conduction device; resistive means; a rectifier; a second series circuit comprising the rectifier, the resistive means, and the power input terminals of said relaxation oscillator connected across said alternating current source of potential; a third series circuit comprising a capacitor and a diode conNected across the power input terminals of said relaxation oscillator; and switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge.
Claim 3
Dependent Claim
26 words
A phase control panel in accordance with claim 1 wherein the controlled conduction devices comprise a pair of back-to-back parallely connected high power silicon controlled rectifiers.
Claim 4
Dependent Claim
237 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallely connected high power silicon controlled rectifiers having trigger terminals or a triac having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said controlled conduction device; a relaxation oscillator having power input terminals and having a pulse output connected to the trigger terminal or terminals of the controlled rectifiers or of the triac; a rectifier connecting said alternating current source of potential to the power input terminals of said relaxation oscillator; a second series circuit comprising a capacitor and a diode connected across the power input terminal of said relaxation oscillator; switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge; a pulse amplifier circuit connecting the pulse output of the relaxation oscillator to the trigger terminal of each silicon controlled rectifier or to the trigger terminal of the triac comprising a source of alternating current potential, a low power silicon controlled rectifier having its trigger terminal connected to the pulse output of the relaxation oscillator, and an RC peaking circuit all connected in series between the cathode and the trigger terminal of each high power silicon controlled rectifier or of the triac.
Claim 5
Dependent Claim
237 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallely connected high power silicon controlled rectifiers having trigger terminals or a triac having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said controlled conduction device; a relaxation oscillator having power input terminals and having a pulse output connected to the trigger terminal or terminals of the controlled rectifiers or of the triac; a rectifier connecting said alternating current source of potential to the power input terminals of said relaxation oscillator; a second series circuit comprising a capacitor and a diode connected across the power input terminal of said relaxation oscillator; switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge; a pulse amplifier circuit connecting the pulse output of the relaxation oscillator to the trigger terminal of each silicon controlled rectifier or to the trigger terminal of the triac comprising a source of alternating current potential, a low power silicon controlled rectifier having its trigger terminal connected to the pulse output of the relaxation oscillator, and an RC peaking circuit all connected in series between the cathode and the trigger terminal of each high power silicon controlled rectifier or of the triac.
Claim 6
Dependent Claim
19 words
A phase control panel in accordance with claim 3 wherein the relaxation oscillator comprises a unijunction transistor pulse generator.
Claim 7
Dependent Claim
48 words
A plurality of phase control panels each designed in accordance with claim 3 and each used to couple one leg of a multiphase load to one branch of a multiphase power source, and further including means for simultaneously actuating the switching means in all the phase controls simultaneously.
Claim 8
Dependent Claim
281 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallelly connected high power silicon controlled rectifiers having trigger terminals or a triac having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and the pair of controlled rectifiers or the triac; a relaxation oscillator having a charging current input terminal, having a pulse output connected to the trigger terminals of the controlled conduction devices or to the trigger terminal of the triac, and having a pair of power input terminals; oscillator initialization means connected between the alternating current source of potential and the relaxation oscillator for resetting said relaxation oscillator at the start of each half cycle supplied by the current source; a resistor connecting said charging current input terminal to one of said relaxation oscillator power input terminals; a capacitor connecting said charging current input terminal to the other of said relaxation oscillator power input terminals; switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge; a pulse amplifier circuit connecting the output of the relaxation oscillator to the trigger terminal of each silicon controlled rectifier or to the trigger terminal of the triac comprising a souRce of alternating current potential, a low power silicon controlled rectifier having its trigger terminal connected to the pulse output of the relaxation oscillator, and an RC peaking circuit all connected in series between the cathode and the trigger terminal of each high power silicon controlled rectifier or of the triac.
Claim 9
Dependent Claim
281 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallelly connected high power silicon controlled rectifiers having trigger terminals or a triac having a trigger terminal; a first series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and the pair of controlled rectifiers or the triac; a relaxation oscillator having a charging current input terminal, having a pulse output connected to the trigger terminals of the controlled conduction devices or to the trigger terminal of the triac, and having a pair of power input terminals; oscillator initialization means connected between the alternating current source of potential and the relaxation oscillator for resetting said relaxation oscillator at the start of each half cycle supplied by the current source; a resistor connecting said charging current input terminal to one of said relaxation oscillator power input terminals; a capacitor connecting said charging current input terminal to the other of said relaxation oscillator power input terminals; switching means connected across said capacitor for alternately short circuiting the capacitor and allowing the capacitor to charge; a pulse amplifier circuit connecting the output of the relaxation oscillator to the trigger terminal of each silicon controlled rectifier or to the trigger terminal of the triac comprising a souRce of alternating current potential, a low power silicon controlled rectifier having its trigger terminal connected to the pulse output of the relaxation oscillator, and an RC peaking circuit all connected in series between the cathode and the trigger terminal of each high power silicon controlled rectifier or of the triac.
Claim 10
Dependent Claim
19 words
A phase control panel in accordance with claim 6 wherein the relaxation oscillator comprises a unijunction transistor pulse generator.
Claim 11
Dependent Claim
49 words
A plurality of phase control panels each designed in accordance with claim 6 and each used to couple one leg of a multiphase load to one branch of a multiphase power source, and further including means for simultaneously actuating the switching means in all the phase control panels simultaneously.
Claim 12
Dependent Claim
184 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallelly connected controlled conduction devices having trigger terminals interconnected by a voltage breakdown device; a series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said pair of controlled conduction devices; relaxation oscillator means having a pulse output; a pair of pulse amplification means receiving pulses from the pulse output of said relaxation oscillator and feeding amplified pulses to said controlled conduction devices through RC peaking circuits; oscillator initialization means connected between the alternating current source of potential and the relaxation oscillator for resetting said relaxation oscillator at the start of each half cycle supplied by the current source; a capacitor within said relaxation oscillator means for delaying the generation of pulses by said relaxation oscillator means in inverse proportion to the charge on the capacitor; and switching means connected across said capacitor for alternately short circuiting said capacitor and allowing said capacitor to charge.
Claim 13
Dependent Claim
184 words
A phase control panel for controlling the flow of energy from an alternating current source of potential to a load comprising: fast blow fuse means; a pair of back-to-back parallelly connected controlled conduction devices having trigger terminals interconnected by a voltage breakdown device; a series circuit connected across the alternating current source of potential and including the load, said fast blow fuse means, and said pair of controlled conduction devices; relaxation oscillator means having a pulse output; a pair of pulse amplification means receiving pulses from the pulse output of said relaxation oscillator and feeding amplified pulses to said controlled conduction devices through RC peaking circuits; oscillator initialization means connected between the alternating current source of potential and the relaxation oscillator for resetting said relaxation oscillator at the start of each half cycle supplied by the current source; a capacitor within said relaxation oscillator means for delaying the generation of pulses by said relaxation oscillator means in inverse proportion to the charge on the capacitor; and switching means connected across said capacitor for alternately short circuiting said capacitor and allowing said capacitor to charge.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |