USB interface and voltage stabilizing and current limiting circuit thereof
A current-limiting circuit and voltage-stabilizing technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as host system voltage drop, USB interface overcurrent, no protection and detection functions, etc.
Inactive Publication Date: 2014-09-03
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
At present, the host system uses direct power supply for USB devices. This power supply method does not have any protection and detection functions. Since the general USB interface has a rated current output capability, once the USB device has an internal short circuit, etc., If the USB interface is over-current, it will cause damage to electronic products.
In addition, if the USB device takes up too much current, it may also cause the voltage of the host system to drop, thereby affecting the normal operation of the entire system.
Method used
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[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly. In this article, the term "transistor" includes bipolar transistors and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide-Semiconductor Field-Effect Tra...
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The invention provides a USB interface and a voltage stabilizing and current limiting circuit of the USB interface. The voltage stabilizing and current limiting circuit comprises a first transistor, a second transistor, a voltage feedback unit, a first operational amplifier, a current-voltage conversion unit and a second operational amplifier. The first connecting end and the control end of the second transistor are connected with the first connecting end and the control end of the first transistor respectively, and the second connecting end of the second transistor is connected with the output end of the voltage stabilizing and current limiting circuit. The voltage feedback unit provides a feedback voltage reflecting an output end voltage. The first input end of the first operational amplifier is connected with the feedback voltage, the second input end of the first operational amplifier is connected with a first reference voltage, and the output end of the first operational amplifier is connected with the control end of the first transistor. The current-voltage conversion unit generates a conversion voltage proportionable with a current flowing through the first transistor. The first input end of the second operational amplifier is connected with the conversion voltage, the second input end of the second operational amplifier is connected with a second reference voltage, and the output end of the second operational amplifier is connected with the control end of the first transistor. Compared with the prior art, voltage stabilizing and current limiting protection can be performed on the USB interface.
Description
【Technical field】 [0001] The invention relates to the field of circuit design, in particular to a USB (Universal Serial Bus, Universal Serial Bus) interface and a voltage stabilizing and current limiting circuit therein. 【Background technique】 [0002] With the increasing popularity of USB data transmission technology, more and more electronic devices choose to configure USB interfaces to realize the transmission and communication with external devices. At present, the host system uses direct power supply for USB devices. This power supply method does not have any protection and detection functions. Since the general USB interface has a rated current output capability, once the USB device has an internal short circuit, etc., If the USB interface is over-current, it will cause damage to the electronic product. In addition, if the USB device consumes too much current, it may also cause the voltage of the host system to drop, thereby affecting the normal operation of the entir...
Claims
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IPC IPC(8): G05F1/56
Inventor 田文博王钊李展
Owner WUXI ZGMICRO ELECTRONICS CO LTD