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US 9,438,127 B2Granted
Reverse current control for an isolated power supply having synchronous rectifiers
AssigneeAnalog Devices Global
InventorsYingyang Ou, Qingyi Huang, Renjian Xie, Ling Ren
Life of this patent
Estimating the term…
Abstract
In certain example embodiments, a system is provided that includes a circuit. The system also includes a reverse current control module that provides an isolated power supply in order to protect one or more devices in a power chain during one or more testing activities having one or more requirements.
Claims24
A power supply, comprising:
- a synchronous rectifier that rectifies an AC voltage to a DC voltage;
- a reverse current control module configured to generate a signal when an input voltage is lower than a threshold, the reverse current control module including a transistor and a shunt regulator, wherein, when a voltage across a reference pin of the shunt regulator is lower than an internal reference voltage of the shunt regulator, a cathode of the shunt regulator is changed to a high resistance status, resulting in the turning off of the transistor;
- and
- a control module that turns off the synchronous rectifier, after receiving the signal from the reverse current control module.
1 more element
A method, comprising:
- sending a first signal from a reverse current control module to a control module when an input voltage is lower than a threshold, the reverse current control module including a transistor and a shunt regulator, wherein, when a voltage across a reference pin of the shunt regulator is lower than an internal reference voltage of the shunt regulator, a cathode of the shunt regulator is changed to a high resistance status, resulting in the turning off of the transistor;
- and
- sending a second signal from the control module to turn off a synchronous rectifier, in response to the first signal.
A method implemented by a power supply, the method comprising:
- rectifying, with a synchronous rectifier, an AC voltage to a DC voltage;
- generating, with a reverse current control module, a signal when an input voltage is lower than a threshold, the reverse current control module including a transistor and a shunt regulator, wherein, when a voltage across a reference pin of the shunt regulator is lower than an internal reference voltage of the shunt regulator, a cathode of the shunt regulator is changed to a high resistance status, resulting in the turning off of the transistor;
- and
- turning off the synchronous rectifier, with a control module, after the control module receives the signal from the reverse current control module.
1 more element
Dependencies are inferred from the claim text.