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US 12,556,108 B2Granted
Power supply circuit, power supply method and electronic device
AssigneeHalo Microelectronics Co., Ltd.
InventorChangwei Lin
Life of this patent
Estimating the term…
Abstract
A power supply circuit includes a rectifier branch, a switch branch, a capacitor branch and a control branch. The rectifier branch is used for rectifying an AC power source to output a first power supply. The control branch is used to output a first driving signal for a first time when an absolute value of an AC voltage of the AC power source is less than a first voltage threshold, or when an absolute value of the first voltage across the switch branch is less than a second voltage threshold. In response to the first driving signal, the switch branch conducts and establishes a connection between the rectifier branch and the capacitor branch. When the control branch outputs the first driving signal for the first time, the switch branch conducts for the first time.
Claims19
A power supply circuit comprising:
- a rectifier branch, a switch branch, a capacitor branch, and a control branch, wherein:
- the rectifier branch is connected to an AC power source and is configured to rectify the AC power source to output a first power supply;
- the control branch is connected to the AC power source and is configured to output a first driving signal for a first time when an absolute value of the AC voltage of the AC power source is less than a first voltage threshold;
- the switch branch is connected to the control branch and is connected between the rectifier branch and the capacitor branch, and the switch branch is configured to conduct in response to the first driving signal to establish a connection between the rectifier branch and the capacitor branch, and wherein the switch branch conducts for the first time when the control branch first outputs the first driving signal;
- and
- the capacitor branch is connected to a load and is configured to be charged by the first power supply when the capacitor branch is connected to the rectifier branch to output a voltage for supplying power to the load, wherein the control branch is further configured to output a second driving signal when the absolute value of the AC voltage is not less than a third voltage threshold after the switch branch has conducted for the first time, and in response to the second driving signal, the switch branch is configured to disconnect the connection between the rectifier branch and the capacitor branch, and wherein the control branch is further configured to output the first driving signal when the absolute value of the AC voltage is less than the third voltage threshold after the switch branch has conducted for the first time and has been disconnected.
3 more elements
A power supply method applied to a power supply circuit including a rectifier branch, a switch branch, and a capacitor branch, wherein the rectifier branch is connected to an AC power source, the switch branch is connected between the rectifier branch and the capacitor branch, and the capacitor branch is connected to a load, the method comprising:
- obtaining an absolute value of a first voltage across two terminals of the switch branch;
- and
- if the absolute value of the first voltage is less than a second voltage threshold, generating a voltage for supplying power to the load based on the AC voltage.
A power supply circuit comprising:
- a rectifier branch, a switch branch, a capacitor branch, and a control branch, wherein:
- the rectifier branch is connected to an AC power source and is configured to rectify the AC power source to output a first power supply;
- the control branch is connected to the AC power source and is configured to output a first driving signal for a first time when an absolute value of the AC voltage of the AC power source is less than a first voltage threshold, or to output the first driving signal for the first time when an absolute value of a first voltage across two terminals of the switch branch is less than a second voltage threshold;
- the switch branch is connected to the control branch and is connected between the rectifier branch and the capacitor branch, and the switch branch is configured to conduct in response to the first driving signal to establish a connection between the rectifier branch and the capacitor branch, and wherein the switch branch conducts for the first time when the control branch first outputs the first driving signal;
- and
- the capacitor branch is connected to a load and is configured to be charged by the first power supply when the capacitor branch is connected to the rectifier branch to output a voltage for supplying power to the load, wherein the control branch comprises a second voltage dividing branch, a third voltage dividing branch, a voltage conversion branch, and a second controller, and wherein:
- a first terminal of the second voltage dividing branch is connected to a fourth terminal of the rectifier branch, a third terminal of the switch branch and a first terminal of the voltage conversion branch;
- a second terminal of the second voltage dividing branch is connected to a first input terminal of the second controller;
- a third terminal of the second voltage dividing branch is connected to a second terminal of the switch branch, a first terminal of the capacitor branch, a first terminal of the third voltage dividing branch, a ground terminal of the second controller and a second terminal of the voltage conversion branch;
- a third terminal of the voltage conversion branch is connected to a power terminal of the second controller;
- a second terminal of the third voltage dividing branch is connected to a second input terminal of the second controller;
- a first terminal of the switch branch is connected to a first output terminal of the second controller;
- a second terminal of the capacitor branch and a third terminal of the third voltage dividing branch are both grounded;
- the second voltage dividing branch is configured to divide the first voltage and output a second detection voltage;
- the third voltage dividing branch is configured to divide the second voltage and output a third detection voltage;
- the second controller is configured to output the first driving signal for the first time when an absolute value of the second detection voltage is less than a sixth voltage threshold, and wherein the absolute value of the second detection voltage is less than the sixth voltage threshold when the absolute value of the second voltage is less than the second voltage threshold;
- and
- the voltage conversion branch is configured to convert a voltage at the fourth terminal of the rectifier branch to provide a power supply voltage for the second controller.
15 more elements
A power supply circuit comprising:
- a rectifier branch, a switch branch, a capacitor branch, and a control branch, wherein:
- the rectifier branch is connected to an AC power source and is configured to rectify the AC power source to output a first power supply;
- the control branch is connected to the AC power source and is configured to output the first driving signal for the first time when an absolute value of a first voltage across two terminals of the switch branch is less than a second voltage threshold;
- the switch branch is connected to the control branch and is connected between the rectifier branch and the capacitor branch, and the switch branch is configured to conduct in response to the first driving signal to establish a connection between the rectifier branch and the capacitor branch, and wherein the switch branch conducts for the first time when the control branch first outputs the first driving signal;
- and
- the capacitor branch is connected to a load and is configured to be charged by the first power supply when the capacitor branch is connected to the rectifier branch to output a voltage for supplying power to the load.
3 more elements
Dependencies are inferred from the claim text.