Multi-port usb fast charging circuit
A protocol circuit and charging equipment technology, applied in the field of multi-port USB fast charging circuit, can solve the problem of low cost advantage and other problems
Active Publication Date: 2022-04-19
ON BRIGHT ELECTRONICS SHANGHAI
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Problems solved by technology
[0008] Compared with the first and second multi-port USB fast charging circuits, although the third multi-port USB fast charging circuit requires fewer transformers, output windings of the transformers, and step-down circuits, it requires an additional output port detection circuit , so the cost advantage is not obvious
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[0017] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed 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 skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configurations and algorithms presented below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention.
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The invention discloses a multi-port USB fast charging circuit, comprising a fast charging protocol circuit and more than two general charging protocol circuits, the ID pin of each general charging protocol circuit is connected to the VDET pin of the fast charging protocol circuit, and the fast charging protocol circuit The VDET pin of the VDET is connected to the reference ground through the detection resistor RDET, wherein: when any USB output port connected to the general charging protocol circuit is plugged into a charging device, the ID pin of the general charging protocol circuit outputs a current Id, and the current Id flows through the detection resistor RDET generates a voltage VDET=Rd*Id on the detection resistor RDET, and Rd is the resistance value of the detection resistor RDET; when the fast charging protocol circuit detects that the voltage VDET on the detection resistor RDET is greater than or equal to Id*Rd through the VDET pin, it will The output voltage of the multi-port USB fast charging circuit is forcibly pulled down and does not support the fast charging function; when the fast charging protocol circuit detects that the voltage VDET on the detection resistor RDET is less than Id*Rd through the VDET pin, the multi-port USB fast charging circuit The output voltage is stepped up and down to support the fast charging function.
Description
technical field [0001] The invention relates to the field of circuits, in particular to a multi-port USB fast charging circuit. Background technique [0002] The traditional multi-port Universal Serial Bus (USB) fast charging circuit is mainly divided into three types (take the two-port USB fast charging circuit as an example): [0003] 1) Two transformers, one large and one small, are used to supply power to the two USB output ports respectively. Among them, the large transformer supports the fast charging function, and the small transformer supports the general charging function. Here, the two outputs are independent and complete circuits, and all primary and secondary side control circuits and components need two sets, which is costly. [0004] 2) A transformer is used to supply power to two USB output ports at the same time. Among them, the transformer has 2 output windings, and each output winding is connected to a step-down circuit. The two outputs support fast chargi...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/00038H02J7/00
Inventor 张昌山谢江华王发刚罗强
Owner ON BRIGHT ELECTRONICS SHANGHAI