US4301423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for controlling the frequency of a pulse generator associated with a microprocessor
Assignee: NSM Apparatebau GmbH and Co KG
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Filing: 1979-08-29
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Granted: 1981-11-17
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Expires: 1999-08-29
Abstract
Abstract A circuit for controlling the frequency of a pulse generator associated with a microprocessor that is connected to power line frequency, uses an RC-stage which is connected ahead of the pulse generator as the frequency-determining element and which has a resistor 19 that is variable by a control signal derived from the microprocessor. The control signal is obtained by comparing the power line frequency and the pulse frequency with one another.
Inventors
- 👤 Arjen J. Mulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
H; H03; H03L; H03L7/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
In a circuit for controlling the operation of a microprocessor which receives electric energy from an AC source, a combination comprising a pulse generator operatively connected to the microprocessor; and means for controlling the operating frequency of the pulse generator, including an RC-stage operatively connected to the pulse generator and including a resistor having a resistance value which is variable by a control signal issuing from the microprocessor and which results from a comparison of the pulse frequency with the AC-source frequency.
Claim 2
Dependent Claim
82 words
In a circuit for controlling the operation of a microprocessor which receives electric energy from an AC source, a combination comprising a pulse generator operatively connected to the microprocessor; and means for controlling the operating frequency of the pulse generator, including an RC-stage operatively connected to the pulse generator and including a resistor having a resistance value which is variable by a control signal issuing from the microprocessor and which results from a comparison of the pulse frequency with the AC-source frequency.
Claim 3
Dependent Claim
28 words
A combination as defined in claim 1; and further comprising a power supply circuit connected to said resistor and including a resistor and a transistor in circuit therewith.
Claim 4
Dependent Claim
48 words
A combination as defined in claim 2, said microprocessor having an output at which said control signal appears as a digital signal; and further comprising a converter circuit for converting the digital signal into an analog signal and supplying the analog signal to a base of said transistor.
Claim 5
Dependent Claim
64 words
A combination as defined in claim 3, said converter circuit including one resistor, a transistor connected in series therewith and having a collector output, another resistor, and means connecting said collector output via said other resistor to the base of the first-mentioned transistor; and means electrically connecting the base of said first-mentioned transistor via a capacitor with the supply voltage for the control circuit.
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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |