DC to DC converter sourcing variable DC link voltage
First Claim
1. A boost converter, comprising:
- a first boost circuit having a first switch configured to be connected to a first coil, the first coil having a first end and a second end; and
a second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end,wherein the first boost circuit is configured to be connected to a power source to receive an input voltage from the power source and the first boost circuit connects to the second boost circuit;
wherein the first switch is controlled to boost the input voltage received from the power source to a first boosted voltage using the first coil without the second coil;
wherein the second switch is controlled to boost the input voltage received from the power source to a second boosted voltage using the first coil and the second coil;
wherein the second boosted voltage is greater than the first boosted voltage, the first boosted voltage is greater than the input voltage received from the power source;
wherein the first coil is configured to be connected to the second coil in series when the second switch is controlled to boost the input voltage received from the power source to the second boosted voltage;
wherein the boost converter is configured to provide the first boosted voltage to operate a load at a first operational level, and the boost converter is configured to provide the second boosted voltage to operate the load at a second operational level that is different from the first operational level; and
wherein the boost converter is configured to provide the first boosted voltage to operate a compressor at a first speed, and the boost converter is configured to provide the second boosted voltage to operate the compressor at a second speed that is greater than the first speed.
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Accused Products
Abstract
An inverter-converter system includes a DC source, a DC to DC boost converter, a DC link capacitor, an inverter circuit, a variable speed electric machine, and a controller. The DC to DC boost converter receives an input DC voltage from the DC source. The inverter circuit converts the variable boosted voltage to an AC voltage to drive the variable speed electric machine. The controller senses a plurality of parameters from the variable speed electric machine, and controls the DC to DC boost converter to boost up the input DC voltage to a variable output voltage based on the plurality of parameters and/or the voltage (or load) needed by the variable speed electric machine. The design of the inverter-converter system can achieve an electrical efficiency and cost savings for the overall system.
19 Citations
15 Claims
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1. A boost converter, comprising:
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a first boost circuit having a first switch configured to be connected to a first coil, the first coil having a first end and a second end; and a second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end, wherein the first boost circuit is configured to be connected to a power source to receive an input voltage from the power source and the first boost circuit connects to the second boost circuit; wherein the first switch is controlled to boost the input voltage received from the power source to a first boosted voltage using the first coil without the second coil; wherein the second switch is controlled to boost the input voltage received from the power source to a second boosted voltage using the first coil and the second coil; wherein the second boosted voltage is greater than the first boosted voltage, the first boosted voltage is greater than the input voltage received from the power source; wherein the first coil is configured to be connected to the second coil in series when the second switch is controlled to boost the input voltage received from the power source to the second boosted voltage; wherein the boost converter is configured to provide the first boosted voltage to operate a load at a first operational level, and the boost converter is configured to provide the second boosted voltage to operate the load at a second operational level that is different from the first operational level; and wherein the boost converter is configured to provide the first boosted voltage to operate a compressor at a first speed, and the boost converter is configured to provide the second boosted voltage to operate the compressor at a second speed that is greater than the first speed. - View Dependent Claims (2, 3, 4, 5)
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6. An inverter-converter system, comprising:
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a boost converter, the boost converter includes; a first boost circuit having a first switch configured to be connected to a first coil, the first coil having a first end and a second end, and a second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end, wherein the first boost circuit is configured to be connected to a power source to receive an input voltage from the power source and the first boost circuit connects to the second boost circuit, wherein the first switch is controlled to boost the input voltage received from the power source to a first boosted voltage using the first coil without the second coil, wherein the second switch is controlled to boost the input voltage received from the power source to a second boosted voltage using the first coil and the second coil; wherein the first coil is configured to be connected to the second coil in series when the second switch is controlled to boost the input voltage received from the power source to the second boosted voltage; and wherein the second boosted voltage is greater than the first boosted voltage, the first boosted voltage is greater than the input voltage received from the power source; the power source providing the input voltage received from the power source to the boost converter; a variable speed electric machine; and a controller that determines a load of the variable speed electric machine and controls the first and the second switch based on the sensed load of the variable speed electric machine, wherein the boost converter is configured to source one of the first boosted voltage and the second boosted voltage to the variable speed electric machine based on the sensed load of the variable speed electric machine, the boost converter is configured to provide the first boosted voltage to operate the variable speed electric machine at a first operational level, and the boost converter is configured to provide the second boosted voltage to operate the variable speed electric machine at a second operational level that is different from the first operational level, and the variable speed electric machine is a compressor, the boost converter is configured to provide the first boosted voltage to operate the compressor at a first speed, and the boost converter is configured to provide the second boosted voltage to operate the compressor at a second speed that is greater than the first speed. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for operating a boost converter, the boost converter including a first boost circuit having a first switch configured to be connected to a first coil, the first coil having a first end and a second end;
- and a second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end, wherein the first boost circuit is configured to be connected to a power source to receive an input voltage from the power source and the first boost circuit connects to the second boost circuit,
the method comprising; receiving the input voltage from the power source; sensing a load of a variable speed electric machine; when the load of the variable speed electric machine is sensed to require a first boosted voltage, controlling the first switch to boost the input voltage received from the power source to the first boosted voltage using the first coil without the second coil; and when the load of the variable speed electric machine is sensed to require a second boosted voltage, controlling the second switch to boost the input voltage received from the power source to the second boosted voltage using the first coil and the second coil, wherein the first coil is configured to be connected to the second coil in series when the second switch is controlled to boost the input voltage received from the power source to the second boosted voltage, wherein the second boosted voltage is greater than the first boosted voltage, the first boosted voltage is greater than the input voltage received from the power source, the method further comprising; the boost converter providing the first boosted voltage to operate the variable speed electric machine at a first operational level; and
the boost converter providing the second boosted voltage to operate the variable speed electric machine at a second operational level that is different from the first operational level, andthe boost converter providing the first boosted voltage to operate a compressor at a first speed; and
the boost converter providing the second boosted voltage to operate the compressor at a second speed that is greater than the first speed. - View Dependent Claims (14, 15)
- and a second boost circuit having a second switch configured to be connected to a second coil, the second coil having a first end and a second end, wherein the first boost circuit is configured to be connected to a power source to receive an input voltage from the power source and the first boost circuit connects to the second boost circuit,
Specification