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US 8,941,367 B2Granted
Switching regulator and the method of generating a peak current signal for the switching regulator
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsYike Li, Li Xu
Life of this patent
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Abstract
A switching regulator including: a power stage having a first power switch and a second power switch coupled in series; a filter circuit having an inductor and an output capacitor; a feedback circuit configured to provide a feedback signal indicating an output voltage of the regulator; and a control circuit configured to provide a switching signal to control the ON and OFF of the first power switch so as to regulate the energy supplied to a load; wherein the control circuit has a peak current generator configured to generate a peak current signal, wherein the gain of a variation of the peak current signal between the contiguous switching cycles is less than one.
Claims4
A switching regulator, comprising:
- a power stage having a first power switch and a second power switch coupled in series to receive an input voltage;
- a filter circuit having an inductor and an output capacitor, an output signal is provided across the output capacitor;
- a feedback circuit having an input terminal configured to receive the output voltage, and an output terminal configured to provide a feedback signal indicating the output voltage based on the output voltage;
- and
- a control circuit configured to provide a switching signal to control the ON and OFF of the first power switch so as to regulate the energy supplied to a load based on a current flowing through the first power switch and the feedback signal;
- wherein
- the control circuit has a peak current generator configured to generate a peak current signal, and wherein a gain of the variation of the peak current signal between contiguous switching cycles is less than one;
- wherein
- the peak current generator comprises:
- a current source;
- a peak capacitor coupled in parallel to the current source, the peak capacitor having two terminals;
- a first switch having a control terminal, a first terminal and a second terminal, the control terminal configured to receive a reset signal;
- an inverter having an input terminal configured to receive the reset signal, and an output terminal configured to provide a reversed reset signal;
- a second switch having a control terminal coupled to the inverter to receive the reversed reset signal, a first terminal coupled to the first terminal of the peak capacitor, and a second terminal coupled to a first terminal of the first switch;
- a filter capacitor having a first terminal coupled to the first terminal of the first switch, and a second terminal coupled to a reference ground;
- and
- a first voltage source having a first terminal coupled to the second terminal of the first switch, and a second terminal coupled to the reference ground;
- wherein
- the filter capacitor is of a same capacitance as the peak capacitor, and the peak current signal is provided across the peak capacitor.
16 more elements
A switching regulator, comprising:
- a power stage having a first power switch and a second power switch coupled in series to receive an input voltage;
- a filter circuit having an inductor and an output capacitor, an output signal is provided across the output capacitor;
- a feedback circuit having an input terminal configured to receive the output voltage, and an output terminal configured to provide a feedback signal indicating the output voltage based on the output voltage;
- and
- a control circuit configured to provide a switching signal to control the ON and OFF of the first power switch so as to regulate the enemy supplied to a load based on a current flowing through the first power switch and the feedback signal;
- wherein
- the control circuit has a peak current generator configured to generate a peak current signal, and wherein a gain of the variation of the peak current signal between contiguous switching cycles is less than one;
- wherein
- the peak current generator comprises:
- a frequency controlled current source having a control terminal configured to receive a frequency signal indicative of the frequency of the switching regulator, a first terminal configured to receive an internal power, and a second terminal configured to provide a current based on the frequency signal;
- and
- a peak resistor having a first terminal coupled to the second terminal of the frequency controlled current source to receive the current, and a second terminal coupled to a reference ground, wherein
- the current provided by the frequency controlled current source flows through the peak resistor to generate the peak current signal.
10 more elements
Dependencies are inferred from the claim text.