SWITCHING DC-TO-DC CONVERTER WITH MULTIPLE OUTPUT VOLTAGES
First Claim
1. A switching DC-to-DC converter, comprising:
- a first power supply channel coupled between a DC voltage source and ground, for converting the DC voltage source to a first DC output voltage;
a second power supply channel coupled between the DC voltage source and ground, for converting the DC voltage source to a second DC output voltage which is separate from the first DC output voltage; and
an oscillator for outputting a first oscillating signal having a first period to the first power supply channel and for outputting a second oscillating signal having a second period to the second power supply channel, wherein;
during each period of the first period, the first oscillating signal presents a peak, a valley, a rising portion gradually increasing from the valley toward the peak, and a falling portion gradually decreasing from the peak toward the valley, such that at least one switching transition of the first power supply channel occurs during one selected from a group consisting of the rising portion and the falling portion; and
during each period of the second period, the second oscillating signal presents an instantly transiting edge which simultaneously occurs with one selected from a group consisting of the peak and the valley, such that at least one switching transition of the second power supply channel simultaneously occurs with the instantly transiting edge.
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Accused Products
Abstract
A switching DC-to-DC converter includes multiple power supply channels, coupled in parallel between a DC voltage source and ground, for converting the DC voltage source into multiple DC output voltages that are separate from each other. An oscillator outputs multiple oscillating signals to render each of the multiple power supply channels make at least one switching transition differently in the time domain from others of the multiple power supply channels, thereby improving transient noise. The multiple oscillating signals include two triangular wave signals with a phase difference of 180 degrees and two pulse wave signals with a phase difference of 180 degrees. Rising edges of the two pulse wave signals occur simultaneously with either a peak or a valley of the two triangular wave signals, respectively.
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Citations
32 Claims
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1. A switching DC-to-DC converter, comprising:
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a first power supply channel coupled between a DC voltage source and ground, for converting the DC voltage source to a first DC output voltage;
a second power supply channel coupled between the DC voltage source and ground, for converting the DC voltage source to a second DC output voltage which is separate from the first DC output voltage; and
an oscillator for outputting a first oscillating signal having a first period to the first power supply channel and for outputting a second oscillating signal having a second period to the second power supply channel, wherein;
during each period of the first period, the first oscillating signal presents a peak, a valley, a rising portion gradually increasing from the valley toward the peak, and a falling portion gradually decreasing from the peak toward the valley, such that at least one switching transition of the first power supply channel occurs during one selected from a group consisting of the rising portion and the falling portion; and
during each period of the second period, the second oscillating signal presents an instantly transiting edge which simultaneously occurs with one selected from a group consisting of the peak and the valley, such that at least one switching transition of the second power supply channel simultaneously occurs with the instantly transiting edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A switching DC-to-DC converter, comprising:
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a plurality of power supply channels connected in parallel between a DC voltage source and ground;
an oscillating signal generator, including;
an oscillating output node coupled to a first power supply channel of the plurality of power supply channels;
a peak comparator having a non-inverting terminal and an inverting terminal, the non-inverting terminal being coupled to a peak setting voltage and the inverting terminal being coupled to the oscillating output node;
a valley comparator having an inverting terminal and a non-inverting terminal, the inverting terminal being coupled to a valley setting voltage and the non-inverting terminal being coupled to the oscillating output node;
a latch having a setting input and a resetting input, the setting input being coupled to an output terminal of the peak comparator and the resetting input being coupled to an output terminal of the valley comparator;
a first inverter having an input terminal coupled to a normal output of the latch;
a first switching means controlled by the first inverter;
a first current source for supplying a first current from the DC voltage source to the oscillating output node;
a second current source, controlled by the first switching means, for flowing a second current from the oscillating output node to the ground; and
a first output capacitor coupled between the oscillating output node and ground; and
an auxiliary signal generator, including;
an auxiliary output node coupled to a second power supply channel of the plurality of power supply channels;
a sample-and-hold amplifier, controlled by the oscillating signal generator, having a non-inverting terminal and an inverting terminal, the non-inverting terminal being coupled to a reference voltage and the inverting terminal being coupled to the auxiliary output node;
a sample-and-hold capacitor coupled between an output terminal of the sample-and-hold amplifier and ground;
a voltage-to-current converter having a voltage input terminal and a current output terminal, the voltage input terminal being coupled to the output terminal of the sample-and-hold amplifier and the current output terminal being coupled to the auxiliary output node;
a second output capacitor coupled between the auxiliary output node and ground; and
a second switching means controlled by the oscillating signal generator and coupled between the auxiliary output node and ground. - View Dependent Claims (21, 22, 23)
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24. An oscillator, comprising:
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means for outputting a first oscillating signal having a first period, and means for outputting a second oscillating signal having a second period, wherein;
during each period of the first period, the first oscillating signal presents a peak, a valley, a rising portion gradually increasing from the valley toward the peak, and a falling portion gradually decreasing from the peak toward the valley, and during each period of the second period, the second oscillating signal presents an instantly transiting edge which simultaneously occurs with one selected from a group consisting of the peak and the valley. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification