Discharge circuit after the bus rectifier bridge integrated in the slave chip

Abstract

The invention relates to a post-discharge circuit of a bus rectifier bridge integrated in a slave chip, including a digital control module, which is used to generate a high-level and time-configurable pulse width to drive when the comparator output result is a bus voltage drop The discharge circuit discharges the bus; the discharge current source module is used to enable the discharge of the bus through the digital module and adjust the magnitude of the discharge current; the comparator is used to obtain the change of the bus voltage; the peripheral circuit is used to monitor the bus voltage The change of the comparator provides a voltage signal reflecting the voltage drop information of the bus and generates a comparison reference voltage. With this circuit, it will only be turned on when the falling edge of the bus communication is detected, which will not increase the power consumption of the whole system; the discharge circuit and the signal processing circuit are relatively independent, and will not couple the noise of the bus to the noise-sensitive circuit Medium; The parameters of the discharge circuit can be configured, which can meet the needs of different systems for electrical performance and improve the adaptability of the product.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to the field of bus power supply communication technology, and specifically refers to a bus rectifier bridge post-discharge circuit integrated in a slave chip. Background technique [0002] Traditionally, polarized communication is used in bus-powered communication systems. The structure of this communication method is as follows figure 1 As shown, the polarity scheme needs to use the marked twisted pair as the signal line for connection to prevent connection errors, that is figure 1 The polarity of the signal lines BUS_C and GND_C must be fixed. This method has the following disadvantages: it is easy to reverse the signal lines when wiring the lines, causing the signal to not be transmitted normally; in addition, in the process of line inspection and correction, polarized connections will bring a lot of inconvenience. Based on the above reasons, the non-polarity c...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: it is easy to reverse the signal line when wiring the line, causing the signal to not be transmitted normally; in addition, in the process of line inspection and correction, polarized connections will bring a lot of inconvenience

However, this path will always be open and the current will be large, which will greatly increase the power consumption of the system

[0010] 2. The signal noise existing on the bus will be coupled to VDD through the resistor Rx, and VDD will become an unclean power supply

This will affect the performance of the signal processing circuit

In order to avoid this problem, it is necessary to add a filter circuit to VDD, which will increase the complexity of the power system and reduce the reliability of the system, which will increase the design cost.

[0011] 3. The discharge current, discharge time and other parameters of the circuit are fixed, which cannot adapt to the requirements of different bus communication methods, and the application range is narrow

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