High-efficiency-direct-drive cryocooler driver
First Claim
1. A cryocooler drive circuit for a cryocooler motor, comprising:
- a first switching power converter configured to track a first sinusoidal input voltage signal to provide a first sinusoidal output voltage signal at a first node;
a second switching power converter configured to track a second sinusoidal input voltage signal to provide a second sinusoidal output voltage signal at a second node, wherein the second sinusoidal input voltage signal is an inverted version of the first sinusoidal input voltage signal such that the cryocooler motor is driven by an alternating current flowing through the first and second nodes; and
a first integrating operational amplifier for generating a first tracking signal responsive to the first sinusoidal input voltage signal and also responsive to the first sinusoidal output voltage signal, wherein the first switching power converter tracks responsive to the first tracking signal.
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Accused Products
Abstract
In one embodiment, a cryocooler drive circuit for a cryocooler motor is provided that includes: a first switching power converter configured to track a first sinusoidal input voltage signal to provide a first sinusoidal output voltage signal at a first output node; and a second switching power converter configured to track a second sinusoidal input voltage signal to provide a second sinusoidal output voltage signal at a second output node, wherein the second sinusoidal input voltage signal is an inverted version of the first sinusoidal input voltage signal such that the cryocooler motor is driven by an alternating current flowing between the first and second output nodes.
19 Citations
20 Claims
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1. A cryocooler drive circuit for a cryocooler motor, comprising:
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a first switching power converter configured to track a first sinusoidal input voltage signal to provide a first sinusoidal output voltage signal at a first node; a second switching power converter configured to track a second sinusoidal input voltage signal to provide a second sinusoidal output voltage signal at a second node, wherein the second sinusoidal input voltage signal is an inverted version of the first sinusoidal input voltage signal such that the cryocooler motor is driven by an alternating current flowing through the first and second nodes; and a first integrating operational amplifier for generating a first tracking signal responsive to the first sinusoidal input voltage signal and also responsive to the first sinusoidal output voltage signal, wherein the first switching power converter tracks responsive to the first tracking signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of driving a cryocooler motor, comprising:
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generating a first sinusoidal input voltage signal and a second sinusoidal input voltage signal that is out-of-phase with regard to the first sinusoidal input voltage signal; in a first buck controller, converting a power supply voltage signal into a first sinusoidal output voltage signal that tracks the first sinusoidal input voltage signal, wherein the first sinusoidal output voltage signal is coupled to a first port for the cryocooler motor so as to drive an alternating current through the cryocooler motor; and in a second buck controller, converting the power supply voltage signal into a second sinusoidal output voltage signal that tracks the second sinusoidal input voltage signal so as to drive the alternating current with regard to second port; wherein the generating the first sinusoidal input voltage signal comprises generating a first tracking signal responsive to the first sinusoidal input voltage signal and also responsive to the first sinusoidal output voltage signal, wherein the first buck controller tracks responsive to the first tracking signal. - View Dependent Claims (13, 14, 15)
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16. A cryocooler, comprising:
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a cryocooler motor; and a cryocooler drive circuit for driving an alternating current through the cryocooler motor, wherein; the cryocooler drive circuit comprises a pair of buck controllers for generating the alternating current and a corresponding pair of operational amplifiers; the corresponding pair of operational amplifiers are configured to generate first and second tracking signals responsive to first and second sinusoidal input voltage signals for respective ones of the pair of buck controllers and also responsive to first and second sinusoidal output voltage signals configured to provide the alternating current; and the pair of buck controllers are configured to track responsive to the corresponding tracking signals. - View Dependent Claims (17, 18, 19, 20)
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Specification