US5432693A
Expired / Lapsed
US
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Digital pulse width modulator circuit with proportional dither
Assignee: Visteon Global Technologies Inc
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Filing: 1993-04-01
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Granted: 1995-07-11
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Expires: 2013-04-01
Abstract
Abstract System and method for digitally generating a pulse width modulated (PWM) signal with dither based on a command signal, the signal having a pulse width proportional to the command signal. In the preferred embodiment, the PWM signal with proportional dither energizes a load, such as a variable force solenoid, with a desired electrical current. The system includes a base signal generator for generating a base signal having a pulse width which is based on a command signal representing the desired electrical current. The system also includes a dither signal generator for digitally generating a dither signal having a pulse width proportional to the command signal, and a summer for combining the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.
Inventors
- 👤 Robert L. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:48
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/02; G06F1/025; H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/157; H03; H03K; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A system for digitally generating a pulse width modulated signal with proportional dither for energizing a load with a desired electrical current, the system comprising: a command register for storing a command signal; base counting means for receiving the command signal from the command register, the base counting means digitally generating a base signal having a pulse width based on the command signal, the pulse width of the base signal having a positive edge and a negative edge; dither counting means responsive to the negative edge of the base signal for digitally generating a dither signal having a predetermined pulse width; and summing means for combining the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.
Claim 2
Independent Claim
123 words
A system for digitally generating a pulse width modulated signal with proportional dither for energizing a load with a desired electrical current, the system comprising: a command register for storing a command signal; base counting means for receiving the command signal from the command register, the base counting means digitally generating a base signal having a pulse width based on the command signal, the pulse width of the base signal having a positive edge and a negative edge; dither counting means responsive to the negative edge of the base signal for digitally generating a dither signal having a predetermined pulse width; and summing means for combining the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.
Claim 3
Dependent Claim
59 words
The system of claim 1 further comprising: first control means for activating the base counting means to digitally generate the base signal; and second control means for activating the dither counting means based on a signal from the base counting means, the dither counting means digitally generating the dither signal having a pulse width proportional to the command signal.
Claim 4
Independent Claim
32 words
The system of 1 wherein the command signal is an 8-bit command word, and wherein the dither signal pulse width is obtained based on the upper four bits of the command word.
Claim 5
Independent Claim
32 words
The system of 1 wherein the command signal is an 8-bit command word, and wherein the dither signal pulse width is obtained based on the upper four bits of the command word.
Claim 6
Dependent Claim
36 words
The system of claim 1 further comprising: proportioning means, in electrical communication with the dither counting means, for digitally controlling the counting means to proportion the pulse width of the dither signal to the command signal.
Claim 7
Independent Claim
102 words
A method of digitally generating a pulse width modulated signal with proportional dither for energizing a load with a desired electrical current, the method comprising: storing a command signal; receiving the command signal and digitally generating a base signal having a predetermined pulse width based on a digitized command signal representing the desired electrical current; in response to a negative edge of the pulse width of the base signal, digitally generating a dither signal having a pulse width proportional to the command signal; and summing the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.
Claim 8
Independent Claim
102 words
A method of digitally generating a pulse width modulated signal with proportional dither for energizing a load with a desired electrical current, the method comprising: storing a command signal; receiving the command signal and digitally generating a base signal having a predetermined pulse width based on a digitized command signal representing the desired electrical current; in response to a negative edge of the pulse width of the base signal, digitally generating a dither signal having a pulse width proportional to the command signal; and summing the base signal and the dither signal to obtain the pulse width modulated signal with proportional dither.
Claim 9
Dependent Claim
31 words
The method of claim 5 wherein the load is a variable force solenoid, the method further comprising energizing the variable force solenoid with the pulse width modulated signal with proportional dither.
Claim 10
Dependent Claim
46 words
The method of claim 5 wherein the step of digitally generating a dither signal includes: digitally generating a dither signal having a predetermined pulse width; and modifying the predetermined pulse width based on the command signal to obtain a pulse width proportional to the command signal.
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) | 1998-07-10 | 1999-01-09 | 1999-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-10 | 2003-01-09 | 2003-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-10 | 2007-01-09 | 2007-07-11 | $7700.00 | Window Closed / Lapsed |