US4900951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch-up restoration circuit
Assignee: Pioneer Corp
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Filing: 1988-11-18
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Granted: 1990-02-13
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Expires: 2008-11-18
Abstract
Abstract A latch-up restoration circuit for an electronic circuit generating a signal having a predetermined operating frequency such as a microcomputer, comprises a latch-up sensing device sensing a state that the frequency of the signal generated by the electronic circuit is on the outside of a predetermined frequency range and generating a latch-up detection signal, and a power supply inhibiting device inhibiting supply of a power current to the electronic circuit for a predetermined time period in response to the latch-up detection signal. The electronic circuit is automatically resumed to an initial state and the latch-up phenomenon is removed when the supply of the power current is restarted.
Inventors
- 👤 Tadashi Saito
- 👤 Ichiro Sakamoto
- 👤 Shizuo Ando
- 👤 Souhei Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:16
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A latch-up restoration circuit for an electronic circuit generating a signal having a predetermined operating frequency, comprising: a latch-up sensing means for sensing a state that the frequency of said signal generated by said electronic circuit is on the outside of a predetermined frequency range and generating a latch-up detection signal; and a power supply inhibiting means for inhibiting supply of a power current to said electronic circuit for a predetermined time period in response to said latch-up detection signal.
Claim 2
Dependent Claim
80 words
A latch-up restoration circuit for an electronic circuit generating a signal having a predetermined operating frequency, comprising: a latch-up sensing means for sensing a state that the frequency of said signal generated by said electronic circuit is on the outside of a predetermined frequency range and generating a latch-up detection signal; and a power supply inhibiting means for inhibiting supply of a power current to said electronic circuit for a predetermined time period in response to said latch-up detection signal.
Claim 3
Dependent Claim
74 words
A latch-up restoration circuit as set forth in claim 1, wherein said latch-up sensing means comprises a charge and discharge circuit performing a charge and discharge operation in response to an instantaneous level of said signal from said electronic circuit, and a comparator circuit comparing an output voltage of said charge and discharge circuit with a reference voltage, and generating said latch-up detection signal when said output voltage becomes larger than said reference voltage.
Claim 4
Dependent Claim
94 words
A latch-up restoration circuit as set forth in claim 1, wherein said latch up sensing means comprises a pulse signal generating means for generating a pulse train signal having a predetermined pulse interval, a pulse count means for counting number of pulses of said pulse train signal, said pulse count means being reset by said signal from said electronic circuit, and a decision means for comparing an output data of said pulse count means with a reference data and generating said latch-up detection signal when said output data becomes larger than said reference data.
Claim 5
Dependent Claim
88 words
A latch-up restoration circuit as set forth in claim 1, wherein a clock signal is supplied to said electronic circuit, and wherein said latch up sensing means comprises a pulse count means for counting number of pulses of said clock signal, said pulse count means being reset by said signal from said electronic circuit, and a decision means for comparing an output data of said pulse count means with a reference data and generating said latch-up detection signal when said output data becomes larger than said reference data.
Claim 6
Dependent Claim
123 words
A latch-up restoration circuit as set forth in claim 1, wherein said latch-up sensing means comprises a first charge and discharge circuit performing a charge and discharge operation in response to an instantaneous level of said signal from said electronic circuit, a first voltage generating circuit generating said latch-up detection signal when an output voltage of said first charge and discharge circuit becomes larger than a first reference voltage, a second charge and discharge circuit performing a charge and discharge operation in response to the instantaneous level of said signal from said electronic circuit, and a second voltage generating circuit generating said latch-up detection signal when an output voltage of said second charge and discharge circuit becomes smaller than a second reference voltage.
Claim 7
Dependent Claim
41 words
A latch-up restoration circuit as set forth in claim 1, further comprising means for suspending the operation of said latch-up sensing means for a time period after said predetermined time period for inhibiting the supply of the power current is terminated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |