CN2655257Y

CN2655257Y - Cell voltage and its internal resistance sampling detector

Info

Publication number: CN2655257Y
Application number: CN 200320117951
Authority: CN
Inventors: 杜齐温
Original assignee: Electrotechnical Branch Of Qingtian Industry Co Ltd Guangzhou
Current assignee: Electrotechnical Branch Of Qingtian Industry Co Ltd Guangzhou
Priority date: 2003-11-11
Filing date: 2003-11-11
Publication date: 2004-11-10
Anticipated expiration: 2013-11-11

Abstract

The utility model discloses a battery voltage and a sampling testing device of voltage and essential resistance of a battery, comprising a battery voltage testing circuit, a battery essential resistance testing circuit, a CPU used to sample the tested battery voltage and the essential resistance, and a synchronization circuit used to test the battery essential resistance, wherein the synchronization circuit comprises two bleeders and a comparer, wherein one bleeder is connected with two ends of the tested battery, the other bleeder is connected with a fixed direct current voltage, the bleeding output of the two bleeders is connected to the input end of the compare as a comparative signal, and a high or low level output of the compare is connected to the CPU as a synchronization signal. When the battery is equipped, a high level is transformed to the CPU, at the time the CPU collects data, when the battery is not equipped, a low level is obtained, now the CPU doesn't collect data, thereby the CPU needs not to cycles and collects data incessantly, which greatly improves the data processing speed of the voltage and the essential resistance of the battery connected by the CPU and shortens the testing time of the battery.

Description

Cell voltage and internal resistance sample detecting device thereof

Technical field

The utility model relates to a kind of being used for ni-mh, NI-G and lithium ion battery and poly-lithium battery is detected its voltage and internal resistance sample detecting device.

Background technology

In the prior art, the device that detects cell voltage and internal resistance mainly by battery voltage detection circuit, internal resistance of cell testing circuit and be used for acquisition testing to cell voltage and internal resistance and give host computer and show that the CPU that preserves forms.Its course of work is: DC voltage is given sine-wave generator, the AC signal of a sine wave of output, AC signal is through constant ac current signal of a feedback transport and placing device output, and alternating current flows through battery, directly give gauge outfit from the battery two ends and show, the voltage of Here it is battery; After alternating current flows through battery, produce an alternating voltage with the internal resistance of cell, through having to an alternating voltage behind the electric capacity isolated DC voltage, alternating voltage amplifies also all-wave shaping through transport and placing device and capacitor filtering can obtain a DC voltage, access the size of DC voltage and give gauge outfit according to the size of the internal resistance of cell and show, Here it is the internal resistance of cell; CPU gathers the data of returning from voltmeter head and internal resistance gauge outfit and handles and give host computer (microcomputer) and show, preserve.Because CPU itself does not also know when begin to survey battery, can only constantly follow the inspection image data, through repeatedly relatively back cell voltage and internal resistance no longer changed and just begin deal with data and give host computer (microcomputer) to show and preserve, will reduce the detection speed of battery like this.

The utility model content

The purpose of this utility model is to provide a kind of cell voltage and internal resistance sample detecting device thereof that detects battery speed that improve.

For achieving the above object, the utility model comprises battery voltage detection circuit, internal resistance of cell testing circuit and be used for acquisition testing to cell voltage and internal resistance and give the CPU that host computer show to be preserved, it is characterized in that also comprising the synchronizing circuit that is used to detect the internal resistance of cell, this synchronizing circuit is made of two voltage dividers and comparer, one of them voltage divider connects the two ends of the battery of surveying, another voltage divider is connected and fixed DC voltage, the dividing potential drop of two voltage dividers is exported the input end of signal access comparer as a comparison, and the high or low level output of comparer inserts described CPU as synchronizing signal.Give CPU a high level when loading onto battery, at this moment, CPU does the data collection, and CPU does not obtain a low level when having battery, and at this moment, CPU does not do data acquisition.

The voltage divider of being made up of resistance R 1, R2 in the synchronizing circuit described in the utility model connects the positive and negative two ends of the battery of surveying, the dividing potential drop output terminals A of this voltage divider connects the positive input of comparer through resistance R 3, the voltage divider of being made up of resistance R 4, R5 is connected and fixed DC voltage, the dividing potential drop output terminal B of this voltage divider is through the negative input of resistance R 6 connection comparers, and the output terminal of comparer inserts the synchronous signal input end of described CPU.

Seal between the negative input of comparer described in the utility model and the output terminal and be used to prevent the capacitor C 1 of shaking.

Because after having increased the synchronizing circuit of internal resistance of cell detection, battery inserts moment and starts test signal for simultaneously one of CPU, can know the time of the battery of packing into and make the laggard line data collection of corresponding delay time, directly give host computer (microcomputer) demonstration and preservation, CPU no longer needs constantly to follow the inspection image data, do not need again through repeatedly judging the stability of cell voltage and internal resistance more afterwards yet, improve CPU greatly to gathering the data processing speed of cell voltage and internal resistance, shortened the detection time of battery.

Description of drawings

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is the schematic diagram of the synchronizing circuit that is used to detect the internal resistance of cell in the utility model.

Embodiment

As Fig. 1, shown in Figure 2, present embodiment is by battery voltage detection circuit, internal resistance of cell testing circuit, be used for acquisition testing to cell voltage and internal resistance and the synchronizing circuit of giving the CPU that host computer show to preserve and being used to detect the internal resistance of cell form, this synchronizing circuit comprises two voltage dividers and comparer, by resistance R 1, the voltage divider that R2 forms connects the positive and negative two ends of the battery of surveying, the dividing potential drop output terminals A of this voltage divider connects the positive input 3 of comparer through resistance R 3, by resistance R 4, voltage divider connection+5V the DC voltage that R5 forms, the dividing potential drop output terminal B of this voltage divider is through the negative input 2 of resistance R 6 connection comparers, and the output terminal 6 of comparer inserts the synchronous signal input end of described CPU through resistance R 7.Between the negative input 2 of comparer and output terminal 6, seal in and be used to prevent the capacitor C 1 of shaking.

The cell voltage of surveying at 0.5V between the 20V, in the foregoing circuit through divider resistance R1, R2 at the exportable 0.12V of A point to a scope between the 4.96V; + 5V voltage process divider resistance R4, R5 are at the exportable 0.096V voltage of B point; The A point is given positive input terminal 3 pin of integrated transporting discharging comparer OP07, and the B point is given negative input end 2 pin of comparer OP07, relatively exports the signal of a high-low level through amplifier and gives CPU.The A point is not 0V through the voltage that R2 ground connection orders A when surveying battery at ordinary times, and the voltage that B is ordered still is 0.096V, and A, B give CPU through low level 0V of comparer output, and at this moment, CPU does not do data acquisition, continues to judge the voltage of this pin.Cell voltage makes the A point voltage drop on 0.12V between the 4.96V through divider resistance R1, R2 when loading onto battery, the B point voltage still is 0.096V, A, B point is given CPU through high level 5V of comparer output, at this moment, CPU does data acquisition again and directly gives host computer demonstration and preservation after having done certain time expand.

Claims

1, a kind of cell voltage and internal resistance sample detecting device thereof, comprise battery voltage detection circuit, internal resistance of cell testing circuit and be used for acquisition testing to cell voltage and internal resistance and give the CPU that host computer show to be preserved, it is characterized in that also comprising the synchronizing circuit that is used to detect the internal resistance of cell, this synchronizing circuit is made of two voltage dividers and comparer, one of them voltage divider connects the two ends of the battery of surveying, another voltage divider is connected and fixed DC voltage, the dividing potential drop of two voltage dividers is exported the input end of signal access comparer as a comparison, and the high or low level output of comparer inserts described CPU as synchronizing signal.

2, cell voltage according to claim 1 and internal resistance sample detecting device thereof, it is characterized in that the voltage divider of being made up of resistance R 1, R2 in the described synchronizing circuit connects the positive and negative two ends of the battery of surveying, the dividing potential drop output terminals A of this voltage divider connects the positive input of comparer through resistance R 3, the voltage divider of being made up of resistance R 4, R5 is connected and fixed DC voltage, the dividing potential drop output terminal B of this voltage divider is through the negative input of resistance R 6 connection comparers, and the output terminal of comparer inserts the synchronous signal input end of described CPU.

3, cell voltage according to claim 1 and internal resistance sample detecting device thereof is characterized in that sealing between the negative input of described comparer and the output terminal and are used to prevent the capacitor C 1 of shaking.