Resonant conversion control method and device with a very low standby power consumption
First Claim
1. A resonant conversion control device with a very low standby power consumption comprising:
- an AC-to-DC conversion unit used for AC-to-DC power conversion, power factor correction and pre-regulation to output a first DC voltage;
a DC-to-DC conversion unit and a DC-to-DC conversion control unit, said DC-to-DC conversion unit receiving said first DC voltage from said AC-to-DC conversion unit and used to convert said first DC voltage to a second DC voltage, and said DC-to-DC conversion control unit receiving a feedback signal of said second DC voltage from said DC-to-DC conversion unit to output said stable second DC voltage by adjusting a frequency of a power transistor control signal of said DC-to-DC conversion unit; and
a standby mode control unit for receiving said second DC voltage from said DC-to-DC conversion unit and then outputting a control signal fed back to said AC-to-DC conversion unit and said DC-to-DC conversion unit to control circuit action statuses of said AC-to-DC conversion unit and said DC-to-DC conversion unit;
whereby said second DC voltage is obtained when an AC voltage is input to said resonant conversion control device with a very low standby power consumption, and power consumption is effectively lowered under any load conditions.
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Abstract
A resonant conversion control device with a very low standby power consumption has an AC-to-DC conversion unit, a DC-to-DC conversion unit, a DC-to-DC conversion control unit, and a standby mode control unit. The resonant conversion control device effectively makes use of the low switching loss characteristic of a resonant conversion device, and uses the output voltage for judgement of the system operation mode. The resonant conversion control device can control the action statuses of the AC-to-DC conversion unit and the DC-to-DC conversion unit to lower effectively the power consumption under the standby mode. Therefore, the resonant conversion control device can solve the problem of a higher standby power consumption of conventional switching power supplies and meet the requirements of future standby power standards.
25 Citations
19 Claims
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1. A resonant conversion control device with a very low standby power consumption comprising:
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an AC-to-DC conversion unit used for AC-to-DC power conversion, power factor correction and pre-regulation to output a first DC voltage;
a DC-to-DC conversion unit and a DC-to-DC conversion control unit, said DC-to-DC conversion unit receiving said first DC voltage from said AC-to-DC conversion unit and used to convert said first DC voltage to a second DC voltage, and said DC-to-DC conversion control unit receiving a feedback signal of said second DC voltage from said DC-to-DC conversion unit to output said stable second DC voltage by adjusting a frequency of a power transistor control signal of said DC-to-DC conversion unit; and
a standby mode control unit for receiving said second DC voltage from said DC-to-DC conversion unit and then outputting a control signal fed back to said AC-to-DC conversion unit and said DC-to-DC conversion unit to control circuit action statuses of said AC-to-DC conversion unit and said DC-to-DC conversion unit;
whereby said second DC voltage is obtained when an AC voltage is input to said resonant conversion control device with a very low standby power consumption, and power consumption is effectively lowered under any load conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A resonant conversion control method with a very low standby power consumption used to judge the present system load status by detecting an output voltage and setting at least two voltage thresholds, the method comprising:
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(a) judging the voltage level of said output voltage; and
(b) operating or closing an AC-to-DC conversion unit and a DC-to-DC conversion unit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification