US4485432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic voltage drop circuit
Assignee: Toshiba Corp
•
Filing: 1982-08-19
•
Granted: 1984-11-27
•
Expires: 2002-08-19
Abstract
Abstract An electronic circuit, having a load circuit driven by a battery, includes a voltage drop circuit to provide a constant dropped voltage even when the battery weakens and the load is activated. During load circuit activation, the dropped voltage is provided by two capacitors in the voltage drop circuit which are charged only during the non-drive period of the load circuit.
Inventors
- 👤 Masaki Kidena
- 👤 Akihiro Nishizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:57
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
An electronic circuit comprising: battery means; voltage drop circuit means for dropping the output voltage of said battery means to provide a dropped voltage, said voltage drop circuit means including two impedance means and switching means for selectively arranging said two impedance means in series connection to said battery means during a charge period and for arranging said two impedance means in parallel connection; load means driven by said battery means; power source switching means for allowing the power supply to be intermittently supplied from said battery means to said load means; and control means for controlling said switching means and said power source switching means for setting the charge period to said two impedance means within the no power supply period to said charge load means by producing a drive control pulse signal applied to said power source switching means and alternately changing the signal level between a drive level to said load means and a non-drive level, and by producing a switch control pulse signal applied to said switching means and having a charge level during the non-drive period of said drive control pulse signal.
Claim 2
Dependent Claim
187 words
An electronic circuit comprising: battery means; voltage drop circuit means for dropping the output voltage of said battery means to provide a dropped voltage, said voltage drop circuit means including two impedance means and switching means for selectively arranging said two impedance means in series connection to said battery means during a charge period and for arranging said two impedance means in parallel connection; load means driven by said battery means; power source switching means for allowing the power supply to be intermittently supplied from said battery means to said load means; and control means for controlling said switching means and said power source switching means for setting the charge period to said two impedance means within the no power supply period to said charge load means by producing a drive control pulse signal applied to said power source switching means and alternately changing the signal level between a drive level to said load means and a non-drive level, and by producing a switch control pulse signal applied to said switching means and having a charge level during the non-drive period of said drive control pulse signal.
Claim 3
Dependent Claim
16 words
An electronic circuit according to claim 1, in which said two impedance means are capacitor means.
Claim 4
Dependent Claim
21 words
An electronic circuit according to claim 2, in which the capacitances of said two capacitors are substantially equal to each other.
Claim 5
Dependent Claim
21 words
An electronic circuit according to claim 2, in which the capacitances of said two capacitor means are different from each other.
Claim 6
Dependent Claim
47 words
An electronic circuit according to claim 1, in which said two impedance means includes a capacitor means coupled with the dropped potential of said battery means and a resistor means coupled with the reference potential when said capacitor means are connected in series to said battery means.
Claim 7
Dependent Claim
65 words
An electronic circuit according to claim 1, in which said voltage drop circuit means is further provided with switch means for interrupting the connection between said output terminal and said battery means, and said control means further produces a start pulse signal applied to said voltage drop circuit means and is at ON level only when said voltage drop circuit means starts to be driven.
References Cited (Backward Citations)
JPS53101616A
Cited
US4205369A
Cited
US4308609A
Cited
DE2950948A1
Cited
US4395138A
Cited
US4404624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |