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US 2010/0149842 A1Published application
Low EMI Producing Switch-Mode Power Supply Within An Intelligent Electronic Device
AssigneeSquare D Company
InventorsErin McPhalen, Shawn Balding
Life of this patent
Estimating the term…
Abstract
An apparatus for varying the timing of a SMPS, including a microcontroller configured to output a first PWM signal. A converter is coupled to the microcontroller and is configured to receive the first PWM signal and output an analog signal to a SMPS timing capacitor coupled to a SMPS. The analog signal varies the discharge time of the timing capacitor to vary a switching frequency of the SMPS.
Claims24
An apparatus for varying the timing of a switch-mode power supply (SMPS), the apparatus comprising:
- a microcontroller configured to output a first pulse width modulated (PWM) signal;
- and
- a converter coupled to the microcontroller and configured to receive the first PWM signal and output an analog signal to a SMPS timing capacitor coupled to a SMPS;
- wherein the analog signal varies the discharge time of the timing capacitor to vary a switching frequency of the SMPS.
1 more element
A method of varying the timing of a switch-mode power supply (SMPS), the method comprising:
- outputting a pulse width modulated (PWM) signal;
- converting the PWM signal to an analog signal;
- varying the discharge time of a SMPS timing capacitor by varying the charge on the timing capacitor with the analog signal causing a switching frequency of the SMPS to be modified.
A system comprising:
- a microcontroller configured to output a first pulse width modulated (PWM) signal;
- a converter coupled to the microcontroller and configured to receive the first PWM signal and output an analog signal;
- a timing capacitor coupled to the converter and responsive to the analog signal, wherein the analog signal varies the discharge time of the timing capacitor by varying the charge on the timing capacitor;
- and
- a switch-mode power supply (SMPS) coupled to the timing capacitor configured to monitor the charge on the timing capacitor and vary the frequency of a second PWM signal in response to the charge on the timing capacitor.
2 more elements
Dependencies are inferred from the claim text.