CN202353254U

CN202353254U - Circuit for transmitting system management bus (SMBUS) signal between isolated grounds

Info

Publication number: CN202353254U
Application number: CN2011204848789U
Authority: CN
Inventors: 肖志云
Original assignee: FUZHOU DEVELOPMENT ZONE XINGYUN ELECTRONIC AUTOMATION Co Ltd
Current assignee: Fujian Nebula Electronics Co Ltd
Priority date: 2011-11-29
Filing date: 2011-11-29
Publication date: 2012-07-25
Anticipated expiration: 2021-11-29

Abstract

The utility model provides a circuit for transmitting a system management bus (SMBUS) signal between isolated grounds. A micro control unit (MCU) end comprises two paths of clock signal wires and two paths of data signal wires, wherein both the input and output of the two paths of clock signal wires and the two paths of data signal wires are separated; and the two paths of clock signal wires are connected to a dual comparator, and the two paths of data signal wires are connected to another dual comparator. An SMBUS communication driving module comprises a level conversion circuit, a level protection circuit and an SMBUS communication module port, which are connected in turn. Both the dual compensators are connected to the level conversion circuit of the SMBUS communication driving module. The function of transmitting the SMBUS signal between the isolated grounds can be realized without an independent power supply, and the problem that line resistance on a line can make SMBUS communication level on a protection plate in a battery pack inconsistent with that on a tester when charging and discharging current is high or fluctuated to finally cause a communication error is effectively solved.

Description

A kind of at the circuit that does not transmit the SMBUS signal altogether between the ground

[technical field]

The utility model relates to a kind of at the circuit that does not transmit the SMBUS signal altogether between the ground.

[background technology]

The lithium battery group of microarray strip management need be carried out reading and writing, the ratio equity of chip data when discharging and recharging.Because the resistance of the line on the circuit; Can make (the System Management Bus of the SMBUS on the baffle in the battery pack at charging and discharging currents during big or fluctuation; For system and the such task of power management provide a control bus) SMBUS communication level on communication level and the tester is inconsistent, finally causes miscommunication.The SMBUS communicating circuit not only needs two cover independent driving circuits, and needs two to overlap independently power supply at present, has increased the cost of equipment virtually.

[summary of the invention]

The technical problem that the utility model will solve is to provide that a kind of it does not need independently power supply at the circuit that does not transmit the SMBUS signal altogether between the ground, just can accomplish in the function of transmission SMBUS signal between the ground altogether not.

The utility model is achieved in that a kind of at the circuit that does not transmit the SMBUS signal altogether between the ground; The MCU end comprises two-way clock cable and the two paths of data holding wire that input, output all separate; Said two-way clock cable is connected to a dual comparator; The two paths of data holding wire is connected to another dual comparator; Said two dual comparators all are connected to a SMBUS communication driving module, and said SMBUS communication driving module comprises level shifting circuit, level protective circuit, the SMBUS communication module port that connects successively; Said two dual comparators all are connected to the level shifting circuit of SMBUS communication driving module.

The advantage of the utility model is:

The utility model MCU end comprises two-way clock cable, two paths of data holding wire; One tunnel control output, drive test amount input prevents the self-locking of low level closed loop; And adopt dual comparator to be implemented in the telecommunication circuit of not transmitting the SMBUS signal altogether between the ground; Therefore do not need independently power supply, just can accomplish and not transmit the function of SMBUS signal altogether between the ground, and effectively eliminated the line resistance on the circuit; Can make during big or fluctuation in the battery pack SMBUS communication level on the baffle and the SMBUS communication level on the tester inconsistent at charging and discharging currents; The problem that finally causes miscommunication, circuit structure simply can also be practiced thrift volume, the cost of testing equipment in addition, improves the reliability of equipment.

[description of drawings]

Combine embodiment that the utility model is further described with reference to the accompanying drawings.

Fig. 1 is the module diagram of the utility model.

Fig. 2 is the modular structure sketch map of the utility model.

Fig. 3 is the electrical block diagram of Fig. 2 one embodiment.

[embodiment]

See also Fig. 1 to shown in Figure 3, the embodiment of the utility model is carried out detailed explanation.

Like Fig. 1, the utility model mainly improves three parts: in SMBUS communication part, high-low level threshold value amplification module part, the SMBUS communication driving module part of MCU end.

Like Fig. 2, in the SMBUS communication part of MCU end: the MCU end comprises two-way clock cable, two paths of data holding wire, one tunnel control output, and drive test amount input prevents the self-locking of low level closed loop.

High-low level threshold value amplification module part: two of the quantity of said high-low level threshold value amplification module; Each high-low level threshold value amplification module is a dual comparator; The two-way clock cable of said MCU is connected to a dual comparator, and the two paths of data holding wire is connected to another dual comparator.Clock signal, data-signal be through dual comparator, the threshold value of high-low level is increased to suitable value transfers to the SMBUS communication driving module again;

The SMBUS communication driving module comprises level shifting circuit, level protective circuit, the communication module port that connects successively; Said level shifting circuit and level protective circuit are used to handle clock signal and the data-signal that high-low level threshold value amplification module is exported; To strengthen the driving force of SMBUS bus; Then receive on the SMBUS communication module port on the load battery-end baffle, with the communicating by letter between the two of the SMBUS communication module on the SMBUS communication part that realizes the MCU end and the load battery-end baffle.

In conjunction with Fig. 3, the clock cable of MCU and data signal line are connected with SMBUS signal on the battery-end baffle, to realize the SMBUS communication on MCU and the battery-end baffle.

The idiographic flow of the utility model is: at the MCU end, clock cable SCLA, data signal line SDA are divided into two-way, S-SDAO1 controls output, and S-SDAI1 measures input, and S-SCLO1 controls output, and S-SCLI1 measures input.Every two paths of signals all passes through a dual comparator, and the threshold value of high-low level is increased to suitable value.Said two dual comparators (N18, N20) are connected with the SMBUS communication driving module.Described SMBUS communication driving module comprises level shifting circuit, level protective circuit (N31), the SMBUS communication module port that connects successively, has strengthened the SMBUS communication antijamming capability of the driving force and the battery-end of SMBUS bus.

The utility model does not need independently power supply; Just can accomplish in the function of not transmitting the SMBUS signal altogether between the ground; And effectively eliminated the line resistance on the circuit; Can make during big or fluctuation in the battery pack SMBUS communication level on the baffle and the SMBUS communication level on the tester inconsistent at charging and discharging currents, finally cause the problem of miscommunication.

The above; Be merely the utility model preferred embodiment; So can not limit the scope that the utility model is implemented according to this, the equivalence of promptly doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.

Claims

1. one kind at the circuit that does not transmit the SMBUS signal altogether between the ground; It is characterized in that: the MCU end comprises two-way clock cable and the two paths of data holding wire that input, output all separate; Said two-way clock cable is connected to a dual comparator; The two paths of data holding wire is connected to another dual comparator; Said two dual comparators all are connected to a SMBUS communication driving module, and said SMBUS communication driving module comprises level shifting circuit, level protective circuit, the SMBUS communication module port that connects successively; Said two dual comparators all are connected to the level shifting circuit of SMBUS communication driving module.