CN204359859U

CN204359859U - A kind of current detection module

Info

Publication number: CN204359859U
Application number: CN201420780862.6U
Authority: CN
Inventors: 刘燕
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-12
Filing date: 2014-12-12
Publication date: 2015-05-27
Anticipated expiration: 2024-12-12

Abstract

The utility model discloses a kind of current detection module, comprise the current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and the data output circuit that connect successively, also comprise for above-mentioned each functional circuit provides the power circuit of operating voltage; Above-mentioned each circuit is integrated on one piece of wiring board and forms module use.The utility model converts digital signal to current acquisition signal, namely forceful electric power is converted to light current, facilitate transmission, circuit components integrated level is higher simultaneously, each circuit unit is integrated in a module, directly external output detections signal, and whole module volume is little, be convenient in specific occasion application, and very large electric current can be gathered.

Description

A kind of current detection module

Technical field

The utility model relates to a kind of current detection module.

Background technology

In some application scenarios, require that the value of the DC current detected is larger.Way traditional at present adopts shunt or direct current instrument transformer to detect exactly, but shunt or direct current instrument transformer volume is large, thermal value is high, efficiency is low, limiting when requiring, just can not use shunt, cannot meet current detecting requirement there being volume.And buy special sensor and detect, cost is corresponding higher.

Utility model content

For overcoming the shortcomings and deficiencies of above-mentioned prior art, the utility model proposes a kind of current detection module.

The technical solution of the utility model is: a kind of current detection module, comprise the current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and the data output circuit that connect successively, also comprise for above-mentioned each functional circuit provides the power circuit of operating voltage, described current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and data output circuit are integrated on one piece of wiring board jointly.

Preferably, described current sampling circuit comprises a sampling resistor.

Preferably, described data output circuit adopts CAN circuit.

Preferred further, the interface of described CAN circuit is provided with isolating chip.

Preferably, the output terminal of described data output circuit also connects current reading circuit.

Compared with prior art, the beneficial effects of the utility model have:

(1) circuit described in the utility model converts digital signal to current acquisition signal, namely forceful electric power is converted to light current, facilitate transmission, circuit components integrated level is higher simultaneously, each circuit unit is integrated in a module, and adopting special output interface to export gathering the signal arranged, described module whole volume is little, is convenient to apply in the occasion having volume to limit at some;

(2) the utility model converts digital signal to larger current analog signal, resolves the size of read current in terminal again, can gather very large electric current;

(3) the utility model is simple relative to existing special current sensor circuit, and cost is low, is easy to build, and greatly can save enterprise cost.

Accompanying drawing explanation

Fig. 1 is the embodiment theory diagram of current detection module described in the utility model;

Fig. 2 is the embodiment schematic diagram of cpu signal treatment circuit described in the utility model;

Fig. 3 is the embodiment schematic diagram of A/D change-over circuit described in the utility model;

Fig. 4 is the embodiment schematic diagram of data output circuit described in the utility model;

Fig. 5 is the embodiment schematic diagram of power circuit described in the utility model.

Embodiment

Understand technology contents of the present utility model for convenience of those skilled in the art, below in conjunction with drawings and Examples, the utility model is described in further detail.

As shown in Figure 1, the current detection module that the utility model discloses, comprises the current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and the data output circuit that connect successively, also comprises for above-mentioned each functional circuit provides the power circuit of operating voltage.The simulating signal of the current sample current acquisition in circuit imports A/D change-over circuit into, A/D change-over circuit converts digital signal to simulating signal and exports, this digital signal is admitted in cpu signal treatment circuit, after CPU process, export to the master control borad of battery management system with CAN signal form, master control borad can read current value after resolving.

As shown in Figure 2-5, be respectively the schematic diagram be applied in battery management system (BMS) of a kind of preferred cpu signal treatment circuit described in the utility model, A/D change-over circuit, data output circuit and power circuit, concrete annexation is shown in the mark in figure.Current signal in battery system is from I5, I6 end input accompanying drawing 3, the signal now collected is analog quantity, through A/D conversion chip U2, the simulating signal of electric current is become digital quantity, this quantity is admitted to cpu signal process chip U1, after treatment, the signal of CAN form is exported to isolating chip U3 from 17 pin and 18 pin, with the current signal of CAN formatted output after isolation, from 12 pin and the output of 13 pin of U3, directly send into the master control borad of BMS, thus BMS master control borad just can read the current value of battery system.In accompanying drawing 5, U5 is a power supply chip, and mainly the low-tension supply of administration measure is for other chip, as the working power of U1, U2, U3 and VCC are provided by it.

This circuit converts digital quantity to current signal, and the current value of itself is also little, through D/A conversion after end BMS reads, electric current can be changed into corresponding value.Therefore this programme principle can gather the very huge current value of reading, but limit by the sampling resistor gathering electric current, the range of current that this programme can gather is-300A ~ 300A.In principle, sampling resistor is larger, and the current value that this system can gather is larger.

The utility model also can arrange current reading circuit at the output terminal of data output circuit, directly can receive the data of CAN transmission if needed, and resolve to corresponding current value and export intuitively, then this module can be used alone for detecting electric current, and is not necessarily integrated in some circuit.

Above-described embodiment is only wherein specific implementation of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection domain of the present utility model.

Claims

1. a current detection module, it is characterized in that: comprise the current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and the data output circuit that connect successively, also comprise for above-mentioned each functional circuit provides the power circuit of operating voltage, described current sampling circuit, A/D change-over circuit, cpu signal treatment circuit and data output circuit are integrated on one piece of wiring board jointly.

2. current detection module according to claim 1, is characterized in that: described current sampling circuit comprises one can be series at the sampling resistor gathered in circuit.

3. current detection module according to claim 1, is characterized in that: described data output circuit adopts CAN circuit.

4. current detection module according to claim 3, is characterized in that: the interface of described CAN circuit is provided with isolating chip.

5. current detection module according to claim 1, is characterized in that: the output terminal of described data output circuit also connects current reading circuit and described current detection module can independently be used.