A trapezoidal wave generation circuit for usb PD controller
A technology for generating circuits and trapezoidal waves, applied in the electronic field, can solve problems such as generation of trapezoidal waves, achieve stable edge time, realize simple circuits, and be easy to implement
Active Publication Date: 2019-11-08
CHIPSEA TECH SHENZHEN CO LTD
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[0007] Based on this, the primary purpose of the present invention is to provide a trapezoidal wave generation circuit for a USB PD controller to solve the physical layer communication problem in the USB PD protocol, that is, the trapezoidal wave generation problem based on the BMC physical layer
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0020] figure 1 As shown, it is the first implementation scheme of the trapezoidal wave generation circuit for the USB PD controller implemented in the present invention (Scheme 1 for short), which includes a square wave signal VCK input and a parallel first square wave generation circuit and a second square wave generating circuit and a switching circuit.
[0021] Both the first square wave generating circuit and the second square wave generating circuit are composed of a charging and discharging circuit and a current source circuit. The charging and discharging circuit and the current source cir...
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The invention discloses a trapezoidal wave generating circuit used for a USB PD controller. The circuit comprises a square signal input, a first square wave generating circuit and a second square wave generating circuit which are connected in parallel, and switching circuits, wherein each of the first square wave generating circuit and the second square wave generating circuit is formed by a charging and discharging circuit and a current source circuit; the charging and discharging circuits and the current source circuits are connected to a power supply VDD in series at a ground terminal; the square signal input is respectively connected to two charging and discharging circuits; the switching circuits are connected behind the first square wave generating circuit and the second square wave generating circuit; and the two switching circuits are connected in parallel to output a trapezoidal wave signal VOUT together. The trapezoidal wave generating circuit realized by the invention can generate strong trapezoidal wave with more stable edge time and solves a problem of physical layer communication in a USB PD protocol and is particularly suitable for the USB PD controller.
Description
technical field [0001] The invention belongs to the field of electronic technology, in particular to a USB interface controller based on the Power Delivery protocol. Background technique [0002] Consumer electronic products such as mobile phones and tablet computers occupy an increasingly important position in people's daily life. The frequency and duration of use have increased significantly, and power consumption has also increased day by day. However, limited by the slow development of the materials and electrochemical industries, the improvement of batteries is slow, and the battery capacity is increasingly unable to meet the needs of consumers, resulting in higher and higher charging frequencies. In order to alleviate consumers' dissatisfaction with battery capacity, major electronics manufacturers continue to study ways to shorten battery charging time. [0003] At present, relatively mature fast charging technologies include the QC (Quick Charge) standard proposed b...
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IPC IPC(8): H03K4/02
CPCH03K4/026
Inventor 李弦
Owner CHIPSEA TECH SHENZHEN CO LTD