High voltage protection system and method for cc pin of type-c interface chip
An interface chip, high-voltage protection technology, applied to emergency protection circuit devices, emergency protection circuit devices, electrical components and other directions for limiting overcurrent/overvoltage, which can solve the problem of VBUS pin short circuit, chip failure, and burning circuit modules. And other issues
Active Publication Date: 2019-05-10
豪威模拟集成电路(北京)有限公司
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Problems solved by technology
like figure 1 As shown, due to the mechanical structure characteristics of the Type-C interface itself, the CC1 and CC2 pins are close to the VBUS pin. Since the VBUS pin can transmit high voltage, when the user uses the Type-C interface, the CC1 and CC2 pins have There may be a short circuit with the VBUS pin, and the circuit module communicating with the CC pin in the Type-C interface chip will be burned, which will cause the chip to fail
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[0042] Such as image 3 shown, based on figure 2 In the high-voltage protection system of the CC pin of the USB Type-C interface chip, the access mode of the switch S1 is changed, and the switch S1 is connected in parallel in the signal path between the CC pin and the internal low-voltage module. Specifically, one end of the switch S1 is connected to the The CC pin is connected to the input end of the low-voltage module, and the other end is grounded; in addition, the high-voltage protection system for the CC pin of the USB Type-C interface chip provided in this embodiment also includes an inverter D, and the inverter D is compared with the voltage The output end of the device AMP is connected to convert the control signal Vtr into a control signal Vtr_b, and output the on-off of the control switch S1; wherein, the control signal Vtr_b is a logic inversion signal of the control signal Vtr;
[0043] When the input voltage Vin at the CC pin is higher than the reference voltage...
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The invention discloses a high-voltage protection system and a high-voltage protection method for a CC pin of a Type-C interface chip. The high-voltage protection system comprises a high-voltage protection device and a high-voltage detection device; when the input voltage of the CC pin of the Type-C interface chip is higher than a reference voltage, the high-voltage detection device produces and outputs a corresponding control signal; by virtue of controlling the high-voltage protection device, the voltage of the input end of a low-voltage module, which communicates with the CC pin, in the Type-C interface chip is controlled within a safe range, so that protection on the low-voltage module is realized. The invention also discloses a high-voltage protection system which adopts an NMOS (N-channel Metal Oxide Semiconductor) transistor to replace the high-voltage protection device and the high-voltage detection device, so that protection on the low-voltage module is realized, and protection on the low-voltage module of the Type-C interface chip is also realized when the Type-C interface chip is lack of power supply. In order to achieve convenient and low-cost construction of the high-voltage protection system, the circuit, device and reference voltage in the Type-C interface chip are preferably adopted as the circuit, device and reference voltage during design of the high-voltage protection system.
Description
technical field [0001] The invention relates to the field of emergency protection circuits, in particular to a high-voltage protection system and method for CC pins of Type-C interface chips. Background technique [0002] With the miniaturization of equipment and the rapid development of portable equipment, the size and quantity of data interfaces have gradually become the key factors restricting the size of equipment, so the demand for miniaturization of data interfaces is also becoming stronger. In this context, the USB standard organization has proposed a new generation of Type-C interface standard to meet the growing demand. In addition to reducing the interface size, the interface functions are enriched, including support for multiple signal paths and high-voltage VBUS power supply. [0003] figure 1 It is a schematic diagram of the new generation Type-C interface chip proposed by the USB standard organization. Such as figure 1 As shown, due to the mechanical struct...
Claims
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IPC IPC(8): H02H9/04
CPCH02H9/045
Inventor 陈晓龙孙博宇
Owner 豪威模拟集成电路(北京)有限公司