MBUS control circuit for temperature control valve and control method thereof

Abstract

The invention provides an MBUS control circuit for a temperature control valve. The MBUS control circuit for the temperature control valve comprises a single chip microcomputer for controlling the temperature control valve, a rectifying circuit in bus connection with MBUS, and a power supply circuit connected with the rectifying circuit and used for supplying power to the single chip microcomputer. The power supply circuit comprises a 6mA constant current source for providing a basic working current to the single chip microcomputer, a 20mA controllable constant current source for providing a large current to the single chip microcomputer and receiving a signal sent by the single chip microcomputer, and a constant-current control circuit for receiving a host signal; the 20mA controllable constant current source comprises a constant current source I1 and a control circuit for receiving the signal of the single chip microcomputer; and a receiving circuit for converting a high-low level sent by a host into a high-low level signal recognized by the single chip microcomputer is connected onto the rectifying circuit. According to the MBUS control circuit for the temperature control valveprovided by the invention, the adopted 20mA controllable constant current source receives a slave signal so as to accomplish data interaction with the host, and the adopted receiving circuit can convert the high-low level on the host into the signal recognized by a slave, so that the problems of power supply and communication between the host and the slave are solved through two power lines.

Description

technical field [0001] The invention belongs to the technical field of control circuits, and in particular relates to an MBUS control circuit for a temperature control valve and a control method thereof. Background technique [0002] MBUS is a bus protocol specially designed for remote data transmission of heat meters. It is an important technology for the digitization of data transmission of measuring instruments. It has been widely used in passive contacts such as water, electricity, gas, heat meters and other data collection occasions. . Because of its advantages of non-polarity and convenient construction, MBUS has been used more and more. For example, heating and water supply are widely used, but MBUS is only used for communication, and some enterprises use MBUS for power supply. For example, directly adding a DCDC step-down chip to the back end of the MBUS, the disadvantage of this solution is that when the load current increases, the bus current will fluctuate, causi...

AI Technical Summary

Problems solved by technology

Because of its advantages of non-polarity and convenient construction, MBUS has been used more and more. For example, heating and water supply are widely used, but MBUS is only used for communication, and some enterprises use MBUS for power supply. For example, directly adding a DCDC step-down chip to the back end of the MBUS, the disadvantage of this solution is that when the load current increases, the bus current will fluctuate, causing the MBUS host to receive wrong data; some companies also use the constant current source method, but only Use a constant current source and the current is too large. The disadvantage of this scheme is that when the load is relatively light, the utilization rate of the large current is very low, and the energy is wasted in vain, causing losses.

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