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Power supply circuit and power supply method

A technology of power supply circuit and resistance value, which is applied in the direction of data processing power supply, electrical program control, electrical digital data processing, etc., to achieve the effect of ensuring charging safety

Active Publication Date: 2018-08-03
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latest USB type-C specification can support adjusting the output current, but the USB type-C specification needs to be forward compatible with the USB2.0 protocol, which requires a special circuit

Method used

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  • Power supply circuit and power supply method
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  • Power supply circuit and power supply method

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0017] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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PUM

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Abstract

The application discloses a power supply circuit and a power supply method. The power supply circuit is compatible with the USB 2.0 protocol and the USB Type-C specification, and the power supply circuit includes: a bus port, a data plus port, a data minus port, a first connection configuration port, a second connection configuration port and a ground port. When the temperature of the power supply circuit is greater than the temperature threshold, the power supply circuit changes the mode under the USB 2.0 protocol from DCP to SDP, and equalizes the resistance values ​​of the first pull-up resistor module and the second pull-up resistor module under the Type-C specification. Adjusting from the first resistance value to the second resistance value or the third resistance value reduces the output current, thereby ensuring the safety of charging.

Description

technical field [0001] The present invention relates to an electronic circuit, and more specifically, the present invention relates to a power supply circuit and a power supply method. Background technique [0002] In Universal Serial Bus (USB) car charging applications, due to the very small size of the printed circuit board (PCB), the interior of the car is relatively closed, there is no air convection, and the ambient temperature is relatively high, making the temperature of the chip very, very high . For safety reasons, most car manufacturers require to reduce the charging current of USB at high temperature to reduce the chip temperature. But the existing USB2.0 protocol does not support the adjustment of the dynamic charging current. The latest USB type-C specification can support the adjustment of output current, but the USB type-C specification needs to be forward compatible with the USB2.0 protocol and requires a special circuit. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/04
CPCG05B19/04G06F1/266G06F1/28G06F1/30G06F13/362
Inventor 龚军勇
Owner CHENGDU MONOLITHIC POWER SYST