Apparatus and method for DC/DC converter having high speed and accuracy
AssigneeBC Systems, Inc
InventorArthur Charych
Life of this patent
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Abstract
A system and method for DC/DC conversion are provided in which a high accuracy digital pulse width modulator controller circuit controls a power switch to obtain a desired DC output. The control circuit amplifies the difference of a DC output sample in relation to voltage reference. The amplified difference is then compared with a portion of the DC output. The compared result is used for controlling the power switch. A ripple coming from the DC output side is overlaid upon either one of the inputs to the comparator depending upon the polarity of the ripple signal.
Claims17
A digital pulse width modulator (PWM) control circuit, comprising:
- a) a first input being a sample of a DC output;
- b) a second input being coupled to the DC output and possessing a ripple signal in synchronization with a DC output component;
- c) a voltage reference for determining a desired DC output;
- d) an adjustment amplifier having a portion of the DC output and the voltage reference as inputs, thereby amplifying a first difference;
- and
- e) a comparator having the first input and the output of the adjustment amplifier as inputs thereto with the second input overlaying one of the comparator inputs, the comparator comparing a second difference;
- thereby a determination is made as to whether the DC output is above or below the desired DC output and a correction is performed to change the DC output to a set of values as close to the desired DC output as possible.
A DC/DC converting system, comprising:
- a) a DC input power source disposed to be switched on and off periodically by a first power switch;
- b) at least one DC output receiving power from the DC input power source;
- c) at least one digital pulse width modulator (PWM) control circuit coupled to the DC output, the circuit including:
- i) a first input being a sample of the DC output;
- ii) a second input being coupled to the DC output and possessing a ripple signal in synchronization with a DC output component;
- iii) a voltage reference for determining a desired DC output;
- iv) an adjustment amplifier having a portion of the DC output and the voltage reference as inputs, thereby amplifying a first difference;
- and
- v) a comparator having the first input and the output of the adjustment amplifier as inputs thereto with the second input overlaying one of the comparator inputs, the comparator comparing a second difference;
- thereby a determination is made as to whether the DC output is above or below the desired DC output and a correction is performed to change the DC output to a set of values as close to the desired DC output as possible.
A method for controlling a DC/DC converter, comprising the steps of:
- a) providing a switchable DC input to generate at least one DC output;
- b) providing a voltage reference;
- c) amplifying a first difference between a portion of the DC output and the voltage reference;
- and
- d) comparing a second difference between a portion of the DC output and the amplified first difference;
- e) overlaying a ripple signal upon either the amplified first difference or the portion of the DC output.
Dependencies are inferred from the claim text.