CN201607522U

CN201607522U - Device for detecting electric quantity of dry battery using voltage method

Info

Publication number: CN201607522U
Application number: CN2010200410728U
Authority: CN
Inventors: 胡亮; 王文龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-01-08
Filing date: 2010-01-08
Publication date: 2010-10-13
Anticipated expiration: 2020-01-08

Abstract

The utility model discloses a device for detecting the electric quantity of a dry battery using a voltage method, comprising a direct-current voltage amplifying circuit, a filter voltage-stabilizing circuit and a voltage comparator, wherein the output end of the direct-current voltage amplifying circuit is connected with the reverse input end of the voltage comparator; the output end of the voltage-stabilizing circuit is connected with the forward input end of the voltage comparator; and the output end of the voltage comparator is connected with a display circuit. By adopting the technical scheme, the device utilizes the voltage comparison principle to carry out quantitative description on the electric quantity of the dry battery and lead a user to have certain assurance to the residual electric quantity of the old dry battery, thus judging whether the dry battery is used or discarded, and not only being beneficial to saving resources, but also having great influence on environmental protection.

Description

Voltage method dry cell electric quantity detection apparatus

Technical field

The utility model belongs to a kind of electric quantity detection apparatus, specifically relates to a kind of electric quantity detection apparatus of dry cell.

Background technology

Along with the fast development of electronic product with popularize, the use amount of dry cell significantly rises gradually.By contrast, the price of dry cell is lower, and the user often not using sufficient dry cell to handle as waste battery, causes the pollution of great waste and environment.Special when formal relatively occasion, relate to hearing or key activities such as various English exams, make the dump energy self-distrust of user to old dry cell.Therefore they are for guaranteeing carrying out smoothly of working and learning, often abandon old dry cell and buy newly, and this part is by the sufficient electric weight of residue still greatly in battery of abandoning.This way is not only wasted resource and contaminated environment, does not also meet the view of development of contemporary China simultaneously.

Summary of the invention

It is simple and can detect the voltage method dry cell electric quantity detection apparatus of dry cell dump energy that the purpose of this utility model provides a kind of circuit theory.

For achieving the above object, the utility model is by the following technical solutions:

The utility model comprises the DC voltage amplifying circuit, filter regulator circuit and voltage comparator, wherein, the reverse input end of the output termination voltage comparator of DC voltage amplifying circuit, the output terminal of mu balanced circuit connects the positive input of voltage comparator, and the output terminal of voltage comparator connects display circuit.

The output terminal of above-mentioned filter regulator circuit is connected to the positive input of voltage comparator by regulating resistor.

Adopt integrated voltage stabilizing chip that signal is carried out voltage stabilizing in the above-mentioned filter regulator circuit.

Above-mentioned display circuit is two light emitting diodes.

Adopt the utility model of technique scheme; utilize voltage ratio principle; electric weight to dry cell has carried out quantitative description; make the user have and to hold to the dump energy of old dry cell; thereby judge to accept or reject not, not only do not helped economizing on resources but also environmental protection being had great role like this.

Description of drawings

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

Fig. 2 is the change curve of the voltage of dry cell in the utility model with service time;

Fig. 3 is a DC voltage amplifier schematic diagram in the utility model.

Embodiment

As shown in Figure 1, the utility model comprises filtering circuit and the mu balanced circuit that is connected with filtering circuit, and the main effect of voltage stabilizer provides a constant DC voltage U of high precision _M, the A node end of regulating resistor R3 is with voltage comparator positive input U _iLink to each other, and the reverse input end U of voltage comparator _RThe positive pole that connects DC voltage amplifier, the output terminal U of voltage comparator _OConnect display circuit.

Need to prove that in the utility model, mu balanced circuit adopts integrated voltage stabilizing chip CW7800; And display circuit is two LEDs 1, LED2, and two light emitting diodes can be different colors.Wherein, the output terminal U of voltage comparator _OConnect the anode of LED 2, the negative electrode of LED 1.

Principle of work of the present utility model is:

C1, C2, C3 are electric capacity among Fig. 1, and R1 is a resistive element; Capacitor C 2 is used for offsetting the inductive effect of input end wiring when long, and capacitor C 3 is unlikely to cause that for when the instantaneous increase and decrease of load current output voltage has than great fluctuation process.When operate as normal, the voltage that mu balanced circuit is exported after regulating resistor R3 pressure regulation is as reference voltage, with the voltage of dry cell as tested voltage, i.e. the forward of voltage comparator input U _iBe reference voltage, it oppositely imports UR is tested voltage.As reference voltage U _i＞tested voltage U _RThe time, voltage comparator output high level, LED 2 is bright; As reference voltage U _i＜tested voltage U _RThe time, the voltage comparator output low level, LED 1 is bright.

Wherein, the basic function of voltage comparator is that the size to two input voltages compares, and shows the output result at output terminal.As figure: U _iBe positive input, U _RBe reverse input end, U ₀It is output terminal.Work as U _i＞U _RThe time, U ₀The output high level, U _i＜U _RThe time, U ₀Output low level.

Fig. 3 is a dc amplification circuit, and dc amplification circuit produces action of low-voltage pulse by the higher-order of oscillation, and pulse transformer boosts to scheduled voltage, and impulse commutation obtains high pressure by a certain percentage, as 10 times of amplified DC voltage.With dry cell voltage U to be measured _InputBe enlarged into U according to a certain percentage _OutputAfter connect voltage comparator and compare with the voltage that the A node provides.

Above-mentioned DC voltage amplifier, voltage stabilizer and voltage comparator are technology well known to those of ordinary skill in the art.

As Fig. 2 is that this curve can carry out match according to the data of this size battery being carried out corresponding experiment gained and obtain according to the voltage of the common No. five dry cells change curve with service time.In the utility model, the minimum service limits of dry cell voltage 0.9V to be measured (1.5*60%=0.9V) as dry cell, and, and the dry cell dump energy that T is corresponding constantly is decided to be 100%. in correspondingly time T serviceable life as dry cellThe 0-T time period is equally divided into five sections, and the corresponding dry cell dump energy of corresponding moment point is: 0 moment, corresponding dry cell dump energy was 100%, and T/5 corresponding dump energy constantly is 80% ... 4T/5 corresponding dump energy constantly is 20%.

Voltage according to experiment gained dry cell--time (electric weight) curve as shown in Figure 2, correspondence obtain 0--T constantly corresponding voltage be respectively 1.5V, U1, U2, U3, U4, U5 (=0.9V) all by experiment curve must be given value, thereby can obtain the corresponding relation of electric weight as described in Table 1:

Service time	0	T/5	2T/5	3T/5	4T /5	T
Service time	0	T/5	2T/5	3T/5	4T /5	T	Voltage (V)	1.5	U ₁	U ₂	U ₃	U ₄	U ₅
Voltage (V) after amplifying 10 times	15	U′ ₁	U′ ₂	U′ ₃	U′ ₄	U′ ₅	Voltage (V)	1.5	U ₁	U ₂	U ₃	U ₄	U ₅
Voltage (V) after amplifying 10 times	15	U′ ₁	U′ ₂	U′ ₃	U′ ₄	U′ ₅	Dump energy (%)	100	80	60	40	20	0

Table 1

(annotate: U ' wherein _i=10*U _i)

When detecting, the voltage that obtains by integrated regulator is U _M, with resistance R ₄Left end B node ground connection to make it current potential be 0V, by regulating the resistance of variable resistor R3, the potential value that makes A node between variable resistor R3 and the R4 is V _i, V _iBe numerically equal to U ' _i

Need to prove six groups of fixed resistance value r of variable resistor R3 _i, r wherein _iCorresponding voltage is U ' _iAccording to formula:

U^{'} = \frac{U_{M}}{R_{1} + R_{2} + R_{3}} \times R_{2} . . . (1)

Obtain.

Then with the voltage U of dry cell to be measured through obtaining after the DC voltage amplifier _OutputCompare through over-voltage comparator with the current potential of A node, work as U _Output＞V _iThe time, i.e. voltage comparator end U _R＞U _i, voltage comparator output terminal output this moment negative level, LED 1 conducting blue light-emitting; Otherwise the LED2 conducting glows.If initial LED2 glows, then regulate variable resistor R ₃Resistance, till LED1 conducting blue light-emitting, this moment, the resistance of variable resistor R3 correspondence was R _i(i=1--6).We can obtain U ' according to (1) formula, and we just can obtain the dump energy of dry cell this moment according to table 1 then.

For ease of reading, the adjustment process of adjustable resistance R3 can be used the form design of rotating disk; Different dump energies are represented in six turned positions of rotating disk.

Claims

1. voltage method dry cell electric quantity detection apparatus, it is characterized in that: it comprises the DC voltage amplifying circuit, filter regulator circuit and voltage comparator, wherein, the reverse input end of the output termination voltage comparator of DC voltage amplifying circuit, the output terminal of mu balanced circuit connects the positive input of voltage comparator, and the output terminal of voltage comparator connects display circuit.

2. voltage method dry cell electric quantity detection apparatus according to claim 1 is characterized in that: the output terminal of described filter regulator circuit is connected to the positive input of voltage comparator by regulating resistor.

3. voltage method dry cell electric quantity detection apparatus according to claim 1 is characterized in that: adopt integrated voltage stabilizing chip that signal is carried out voltage stabilizing in the described filter regulator circuit.

4. voltage method dry cell electric quantity detection apparatus according to claim 1 is characterized in that: described display circuit is two light emitting diodes.