US3665216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse width modulation detector
Assignee: Yokogawa Electric Corp
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Filing: 1969-11-12
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Granted: 1972-05-23
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Expires: 1989-11-12
Abstract
Abstract An electric signal converter having two constant-current power sources, two electric circuits respectively including said two constant-current power sources, switches incorporated in said electric circuits, a signal source for turning on and off said switches, means for producing in said electric circuits electric signals having differential factors opposite to each other, and means for coupling said two electric circuits to combine said electric signals for providing a substantially constant composite signal.
Inventors
- 👤 Tadayoshi Fuchie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:06
CPC Classifications
H; H03; H03K; H03K9/00; H03K9/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A detector for converting pulse width modulated signals to a DC signal comprising: two constant-current power source means including two grounded base type transistors; a DC bias power source means connected to the bases of said two transistors; two switch means each connected between said DC bias source and each of the emitters of said two transistors; an input pulse signal source to which a signal component is applied with a duty ratio for turning on and off the switch means in correspondence with the duty ratio; a diode connected between the collectors of said two transistors; a series circuit of two capacitors connected in parallel to said diode; a second DC power source connected between the connection point of the two capacitors and the junction point of said switch means; and a pair of output terminals connected across either of said two capacitors and producing a DC signal without ripple components with said DC signal corresponding to the duty ratio of the input pulse signal.
Claim 2
Dependent Claim
166 words
A detector for converting pulse width modulated signals to a DC signal comprising: two constant-current power source means including two grounded base type transistors; a DC bias power source means connected to the bases of said two transistors; two switch means each connected between said DC bias source and each of the emitters of said two transistors; an input pulse signal source to which a signal component is applied with a duty ratio for turning on and off the switch means in correspondence with the duty ratio; a diode connected between the collectors of said two transistors; a series circuit of two capacitors connected in parallel to said diode; a second DC power source connected between the connection point of the two capacitors and the junction point of said switch means; and a pair of output terminals connected across either of said two capacitors and producing a DC signal without ripple components with said DC signal corresponding to the duty ratio of the input pulse signal.
Claim 3
Dependent Claim
201 words
A detector for converting pulse width modulated signals to a DC signal comprising: two constant-current power source means; two switch means respectively connected to said two constant-current power source means; two electrical circuit means connected to said switch means and said constant-current power source means; said two switch means operated in synchronism with each other; an input pulse signal source applied to said switch means, and said input pulse signal source having a duty ratio of T1/T for synchronously turning on and off the switch means in correspondence with the duty ratio and wherein T1 represents a time modulated pulse and T represents the repetitive period of said pulse; means for producing in said two electrical circuits electrical signals which contain ripple components that vary in accordance with the duty ratio and in which the ripple components are opposite to each other; means for differentially coupling the two signals produced in said two electrical circuits to produce a substantially constant composite DC signal with no ripple components, the DC signal having an amplitude corresponding to the duty ratio, and output terminals to which said DC signal is applied; and wherein a diode is connected between the two constant-current power source means.
Claim 4
Dependent Claim
201 words
A detector for converting pulse width modulated signals to a DC signal comprising: two constant-current power source means; two switch means respectively connected to said two constant-current power source means; two electrical circuit means connected to said switch means and said constant-current power source means; said two switch means operated in synchronism with each other; an input pulse signal source applied to said switch means, and said input pulse signal source having a duty ratio of T1/T for synchronously turning on and off the switch means in correspondence with the duty ratio and wherein T1 represents a time modulated pulse and T represents the repetitive period of said pulse; means for producing in said two electrical circuits electrical signals which contain ripple components that vary in accordance with the duty ratio and in which the ripple components are opposite to each other; means for differentially coupling the two signals produced in said two electrical circuits to produce a substantially constant composite DC signal with no ripple components, the DC signal having an amplitude corresponding to the duty ratio, and output terminals to which said DC signal is applied; and wherein a diode is connected between the two constant-current power source means.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |