Power Supply with Fast Discharging for Configurable Output Voltage
First Claim
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1. A universal serial bus (USB) charger for providing power to a client device comprising:
- a USB connector configured to interface with the client device, and to receive a request for an output voltage at a first voltage level;
a converter circuit, an output of the converter circuit coupled to the USB connector, the converter circuit configured to convert an input voltage level to an output voltage level, the converter circuit comprising an output capacitor;
a bleeder circuit coupled to the converter circuit, the bleeder circuit configured to discharge the output capacitor of the converter circuit responsive to the output voltage level of the converter circuit being greater than the first voltage level; and
an output controller configured to control the output voltage level of the converter circuit, and configured the turn the bleeder circuit on and off.
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Abstract
A universal serial bus (USB) charger provides power to a client device. A USB connector interfaces with a client device and receives a request for the output voltage of the USB charger to be at a specific value. If the requested voltage level is lower than the current output voltage level, the output voltage level is set to the requested level and a bleeder circuit is enabled to discharge the output capacitor of the USB charger.
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Citations
23 Claims
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1. A universal serial bus (USB) charger for providing power to a client device comprising:
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a USB connector configured to interface with the client device, and to receive a request for an output voltage at a first voltage level; a converter circuit, an output of the converter circuit coupled to the USB connector, the converter circuit configured to convert an input voltage level to an output voltage level, the converter circuit comprising an output capacitor; a bleeder circuit coupled to the converter circuit, the bleeder circuit configured to discharge the output capacitor of the converter circuit responsive to the output voltage level of the converter circuit being greater than the first voltage level; and an output controller configured to control the output voltage level of the converter circuit, and configured the turn the bleeder circuit on and off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for providing power to a client device in a plurality of voltage levels comprising:
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receiving a request, at a universal serial bus (USB) charger via a USB port, for an output voltage at a first voltage level; and responsive to determining that the requested first voltage level is lower than an output voltage level of the USB charger; setting the output voltage level to the first level, and enabling a bleeder circuit, the bleeder circuit configured to discharge an output capacitor of the USB charger. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for providing power to a client device in a plurality of voltage levels comprising:
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determining, by a universal serial bus (USB) charger, whether the client device is connected to the USB charger; and responsive to determining that the client device is not connected; determining whether an output voltage is at a second voltage level, the second voltage level higher than a first voltage level; and responsive to determining that the output voltage level is at the second voltage level; setting the output voltage level to the first voltage level; and enabling a bleeder circuit, the bleeder circuit configured to discharge an output capacitor of the USB charger. - View Dependent Claims (20, 21, 22, 23)
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Specification