CN101256208A

CN101256208A - Voltage measurement display device

Info

Publication number: CN101256208A
Application number: CNA2008100693442A
Authority: CN
Inventors: 王征; 周军; 姚赤光
Original assignee: Chongqing Zongshen Technology Development and Research Co Ltd
Current assignee: Chongqing Zongshen Technology Development and Research Co Ltd
Priority date: 2008-01-29
Filing date: 2008-01-29
Publication date: 2008-09-03

Abstract

The invention discloses a voltage measuring and displaying device, comprising: at least one voltage collecting circuit, which is composed of operational circuit connected with the control switch and voltage stabilizing circuit. The voltage signal measured by voltage collecting circuit is output to a singlechip for detecting the voltage signal. The voltage signal measured by singlechip is output to a level switching circuit, which outputs the voltage signal to a liquid crystal display to display the voltage value. The device detects each voltage of basic unit at real time, when one or several voltages is lower than the lowest operating voltage requirement, the alarm is timely sent and the voltage can be displayed on the liquid crystal display. The stabilizing circuit can effectively solve the problem that the test line on using generates high positive voltage or negative voltage due to unexpected turnoff to damage the electronic component.

Description

A kind of voltage measurement display device

Technical field

The present invention relates to electronic technology field, be meant a kind of voltage measurement display device especially.

Background technology

Along with science and technology development, cleaning, the green energy will become the main energy sources of following society.Wherein, fuel cell will be as the clean energy resource of first-selection.

Fuel cell is to add the hydrogen of certain pressure and oxygen in the elementary cell of forming with membrane electrode assembly (MEA) to carry out electrochemical reaction and generate electricity.

When fuel cell piles up operation, because a variety of causes causes the operating voltage of some or a plurality of elementary cells wherein to be lower than minimum operating voltage, (for example: the original poor performance of membrane electrode, membrane electrode damages and reveals, because of generating water generation water blocking or the like), if this occurs, fuel cell pile work just might damage membrane electrode and cause danger, for avoiding the generation of above-mentioned situation, just must there be pick-up unit to detect the voltage of each elementary cell of fuel cell in real time, takes corresponding solution so that in time pinpoint the problems.

Mainly contain two kinds of voltage check devices now and measure the voltage of each unit, first kind as shown in Figure 1, and unit measured among the figure comprises Cell1 to Celln, for n unit.Signal after the amplifier connects simulation switch chip P1, and P1 connects AD conversion chip P2, and the digital signal after P2 will change is sent to single-chip microcomputer P3.The amplifier pipe detects the voltage of each elementary cell, and each unit under test needs two p-wires, and fuel cell pile has n elementary cell, just needs 2n root p-wire, and is very loaded down with trivial details.

Second kind of device is the improvement to first kind of device, as shown in Figure 2, carry out the dependence test line shared, just only need n+1 root p-wire, if device can be tested m elementary cell, as shown in Figure 3, and fuel cell pile has only n elementary cell (m＞n), remaining p-wire will be unsettled, therefore and n+1 amplifier of this device will produce one than high negative, just might damage the associated electronic components such as analog switch chip, AD chip, single-chip microcomputer of n+1 amplifier and back.

In addition, the analog switch chip of two devices and AD chip all are that external test speed is relatively slow more than; And the voltage tester port do not have relevant holding circuit yet, might be because the opening circuit of a certain p-wire that is using, and make relevant amplifier generation damage amplifier and associated electronic components than high negative or than higher malleation; And there are not function displaying voltage and an abnormal alarm function.

Summary of the invention

In view of this, the invention reside in provides a kind of voltage measurement display device, can't show measuring voltage to solve said apparatus, and in the measuring voltage process, the problem that may cause voltage breakdown to burn.

For addressing the above problem, the invention provides a kind of voltage measurement display device, comprising: at least more than one voltage collection circuit, described voltage collection circuit comprises the discharge circuit that connects gauge tap, described discharge circuit connects mu balanced circuit; The voltage signal that described voltage collection circuit is measured exports the single-chip microcomputer that detects described voltage signal to, voltage signal after described single-chip microcomputer will detect exports the level shifting circuit of connection to, and the liquid crystal display circuit that the voltage signal after described level shifting circuit will detect exports connection to shows concrete magnitude of voltage.

Preferably, described mu balanced circuit is identical, the diode that direction is opposite of electric capacity, both direction that is connected in parallel.

Preferably, described single-chip microcomputer also the described voltage signal of joint detection produce the warning circuit of alerting signal greater than threshold value.

Preferably, described single-chip microcomputer also connects reset circuit.

The pile of this measurement device n elementary unit groups only needs n+1 root p-wire; The voltage of each elementary cell can be detected in real time, when some or several voltages are lower than minimum operating voltage and require, warning can be sent timely; And each voltage of measuring is shown by liquid crystal.For voltage collection circuit, increased S2 and carried out the break-make setting to the Sm gauge tap, can the number of test be provided with, solved the negative voltage problem; Because the ceiling voltage of each elementary unit groups can not surpass 1.2V, special diode and 1 reverse diode in amplifier output terminal 2 forwards serial connection in parallel, its forward conduction voltage is 1.4V, reverse-conducting voltage is 0.7V (promptly the output voltage of amplifier being clamped down at-0.7V between the 1.4V), effectively solved the p-wire that using because of the accident problem that the higher positive voltage of the ratio that produces or negative voltage damage electronic component that opens circuit, can not influence normal voltage output simultaneously yet; At amplifier output terminal electric capacity in parallel, the output that can effectively stablize amplifier makes the test data of single-chip microcomputer stable simultaneously.For single chip circuit, built-in analog switch and AD control external simulation switch chip and AD chip with respect to other single-chip microcomputers by control line, and its control rate compares higher, has also just improved the test speed of whole device.

Description of drawings

Fig. 1 is the structural drawing of first kind of voltage measuring apparatus;

Fig. 2 is the structural drawing of second kind of voltage measuring apparatus;

Synoptic diagram when Fig. 3 is second kind of voltage measuring apparatus measurement;

Fig. 4 is a schematic diagram of the present invention;

Fig. 5 A, Fig. 5 B are the structural drawing in the embodiment of the invention;

Fig. 6 is the synoptic diagram of Fig. 6 A, Fig. 6 B splicing;

Fig. 7 is the process flow diagram of device work.

Embodiment

For clearly demonstrating the device among the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.

The schematic diagram of embodiment can be referring to Fig. 4, and structural drawing can be referring to Fig. 5 A, Fig. 5 B, Fig. 6, be the structure of installing among clear this embodiment of expression, and the structural drawing of this device is decomposed into Fig. 5 A, Fig. 5 B two parts along dotted line, and as the splicing form of Fig. 6.

Wherein, Fig. 5 A is this device voltage collection circuit, this voltage collection circuit comprises gauge tap, gauge tap can connect each measuring unit in the measured fuel cell, gauge tap connects discharge circuit, this discharge circuit is integrated transporting discharging LM741AR1 to ARn, or the amplifier electron device of other type; The voltage signal of discharge circuit after with amplifier exports the single-chip microcomputer of connection to by mu balanced circuit; Mu balanced circuit is identical, the diode that direction is opposite of the electric capacity, the both direction that are connected in parallel.

At last, the voltage signal that voltage collection circuit is measured exports the single-chip microcomputer that detects described voltage signal to, shown in Fig. 5 B, single-chip microcomputer is the U1 chip among the figure, single-chip microcomputer carries out the detection of voltage signal, and can differentiate and export the signal after detecting, have analog switch and A/D change-over circuit in the single-chip microcomputer, signal after the detection of output is undertaken exporting the concrete numerical value of liquid crystal display circuit demonstration to after the voltage transitions by level shifting circuit.Liquid crystal display circuit is the P1 chip among Fig. 5 B, and level shifting circuit is U2 to the U5 chip among Fig. 5 B, is connected by bus between level shifting circuit and single-chip microcomputer and the liquid crystal display circuit.

Single-chip microcomputer also can be differentiated magnitude of voltage after the voltage signal that receives is detected, and when detected magnitude of voltage during greater than threshold value, produces alerting signal, and reports to the police with auditory tone cues by the loudspeaker LS1 in the warning circuit.

For preventing single-chip microcomputer in the course of the work, endless loop appears in working procedure, and single-chip microcomputer also connects reset circuit, quits work in measuring process as this device, can reset by the reset switch SW1 in the reset circuit.

Can to adopt integrated single-chip microcomputer can adopt model be the chip of PIC24HJ256GP610 to discharge circuit in this device, it is the chip of 74HC125 that U2 to U5 chip in the level shifting circuit can adopt model, and it is the display of MST-G320240DBSW-213W-E that the liquid crystal change-over circuit can adopt model.

Before measuring by this device, the number of elementary entitles n that first setting will be measured (n must be less than or equal to the maximum that device allows and measure number m) connects gauge tap S2 to Sn, disconnection Sn+1; Connect p-wire again to each elementary unit groups; During measurement, single-chip microcomputer passes through voltage collection circuit, collect the voltage of fuel cell pile unit Cell1 to the elementary unit groups of Celln, when the voltage of some or several elementary unit groups is lower than minimum operating voltage and requires (being lower than setting value), single-chip microcomputer sends warning by warning circuit, and single-chip microcomputer drives liquid crystal by level shifting circuit the voltage of each each that measure is shown, and has reached the voltage purpose of each elementary unit groups of real-time detection fuel cell.

By the gauge tap in the voltage collection circuit, can the unit number of test be provided with; Because the ceiling voltage of each elementary unit groups can not surpass 1.2V, special diode and 1 reverse diode in amplifier output terminal 2 forwards serial connection in parallel, its forward conduction voltage is 1.4V, and reverse-conducting voltage is 0.7V (promptly the output voltage of amplifier being clamped down at-0.7V between the 1.4V); Simultaneously at amplifier output terminal electric capacity in parallel.

Workflow in this device busy process can be referring to Fig. 7, after the fuel cell start, each unit in the fuel cell pack is carried out voltage detecting, if be lower than threshold value then report to the police, if normal, then shows concrete magnitude of voltage by the liquid crystal circuit.In the course of the work, in case receive this device of off signal and quit work immediately.

The pile of this measurement device n elementary unit groups only needs n+1 root p-wire; The voltage of each elementary cell can be detected in real time, when some or several voltages are lower than minimum operating voltage and require, warning can be sent timely; And each voltage of measuring is shown by liquid crystal.For voltage collection circuit, increased S2 and carried out the break-make setting to Sm, can the number of test be provided with, solved the negative voltage problem; Because the ceiling voltage of each elementary unit groups can not surpass 1.2V, special diode and 1 reverse diode in amplifier output terminal 2 forwards serial connection in parallel, its forward conduction voltage is 1.4V, reverse-conducting voltage is 0.7V (promptly the output voltage of amplifier being clamped down at-0.7V between the 1.4V), effectively solved the p-wire that using because of the accident problem that the higher positive voltage of the ratio that produces or negative voltage damage electronic component that opens circuit, can not influence normal voltage output simultaneously yet; At amplifier output terminal electric capacity in parallel, can effectively filter undesired signal simultaneously, the test data that makes single-chip microcomputer is more accurately with stable.For single chip circuit, built-in analog switch and AD control external simulation switch chip and AD chip with respect to other single-chip microcomputers by control line, and its control rate compares higher, has also just improved the test speed of whole device.

Describe the device among the present invention above in detail, within the spirit and principles in the present invention all for the device of being set forth in the embodiment of the invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1, a kind of voltage measurement display device is characterized in that, comprising: at least more than one voltage collection circuit, and described voltage collection circuit comprises the discharge circuit that connects gauge tap, described discharge circuit connects mu balanced circuit; The voltage signal that described voltage collection circuit is measured exports the single-chip microcomputer that detects described voltage signal to, voltage signal after described single-chip microcomputer will detect exports the level shifting circuit of connection to, and the liquid crystal display circuit that the voltage signal after described level shifting circuit will detect exports connection to shows concrete magnitude of voltage.

2, voltage measurement display device according to claim 1 is characterized in that, described mu balanced circuit is identical, the diode that direction is opposite of the electric capacity, the both direction that are connected in parallel.

3, voltage measurement display device according to claim 1 is characterized in that, the described single-chip microcomputer also described voltage signal of joint detection produces the warning circuit of alerting signal greater than threshold value.

4, voltage measurement display device according to claim 1 is characterized in that, described single-chip microcomputer also connects reset circuit.