CN201477197U - Battery capacity automatic detection device - Google Patents

Abstract

The utility model relates to automatic detection technology, in particular to an automatic detection device for battery capacity. The utility model provides an automatic detection device for battery capacity, which detects whether the actual capacity of the battery is consistent with the marked capacity. The main points of the technical solution are: the battery capacity automatic detection device includes an interlock switch circuit, a discharge circuit and a calculation display circuit, the interlock switch circuit is connected to the discharge circuit, and the discharge circuit is connected to the calculation display circuit. The beneficial effects of the utility model are: the detection of the battery capacity can be realized to distinguish the quality of the battery, and it is suitable for the detection of the battery capacity.

Description

Battery capacity automatic detection device

technical field

The utility model relates to automatic detection technology, in particular to an automatic detection device for battery capacity.

Background technique

At present, there are more and more batteries of various types, and there are many types of batteries used by battery users (such as mobile phone batteries), and the quality of these batteries is also uneven. Whether it is a battery problem or an electrical problem, users cannot intuitively judge whether the battery is good or bad. Therefore need a kind of device that can detect battery capacity automatically, to detect whether the actual capacity of battery matches with marked capacity, also do not have this device to appear on the market at present.

Utility model content

The technical problem to be solved by the utility model is to propose an automatic battery capacity detection device to detect whether the actual capacity of the battery is consistent with the marked capacity.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: an automatic detection device for battery capacity, including an interlock switch circuit, a discharge circuit and a calculation display circuit, the interlock switch circuit is connected to the discharge circuit, and the discharge circuit is connected to the calculation display circuit.

Further, a milliampere meter is also included, one end of the milliampere meter is connected to the positive electrode of the battery under test, and the other end is connected to the interlock switch circuit.

The interlock switch circuit includes a switch, a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, and a second transistor; the first transistor is an NPN transistor, and the second transistor is an NPN transistor. The transistor is a PNP transistor; the second resistor is connected between the base and the emitter of the first transistor; one end of the first resistor is connected to the base of the first transistor, and the other end is connected to the first transistor through a switch. The emitter of the second triode; the third resistor is connected to the collector of the first triode and the base of the second triode; the fourth resistor is connected between the base of the first triode and the second between the collectors of the triodes; the emitter of the first triode is connected to the negative pole of the battery under test; the emitter of the second triode is connected to the positive pole of the battery under test through a milliampere meter.

The discharge circuit includes a fifth resistor, a light-emitting diode, a capacitor, and a third triode; one end of the fifth resistor is connected to the collector of the second triode, and the other end is connected to the anode of the light-emitting diode; the third triode The tube is an NPN tube, its collector is connected to the emitter of the second triode, and its emitter is connected to the calculation display circuit; one end of the capacitor is connected to the base of the third triode, and the other end is connected to the negative pole of the battery under test; The cathode of the light-emitting diode is connected to the negative pole of the battery under test.

The calculation and display circuit includes N two-way toggle switches, N resistors, a microprocessor, and a display device; the N two-way toggle switches are connected to the negative pole of the battery under test one by one through N resistors, and N The two-way toggle switch is also connected to the microprocessor; the end of the fourth resistor connected to the base of the first triode is also connected to the microprocessor; the microprocessor is connected to the display device, N≥1, and is a positive integer.

The microprocessor is a single chip microcomputer, and the display device is a digital tube.

The beneficial effect of the utility model is that the detection of the battery capacity can be realized to distinguish whether the battery is good or bad.

Description of drawings

Fig. 1 is a schematic circuit diagram of the embodiment.

In the figure, K1, K2, and K3 are two-way toggle switches, R6, R7, and R8 are resistors, SW is a switch, LED1 is a light-emitting diode, and C1 is a capacitor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

The utility model proposes a battery capacity automatic detection device aiming at the inability to distinguish whether the actual capacity of the battery matches the marked capacity in the current market. It includes a battery capacity automatic detection device, including an interlock switch circuit, a discharge circuit and a calculation display circuit. The interlock switch circuit is connected to a discharge circuit, and the discharge circuit is connected to a calculation and display circuit.

Example:

As shown in Figure 1, the battery capacity automatic detection device in this example includes an interlock switch circuit, a discharge circuit and a calculation display circuit, and the interlock switch circuit includes a switch SW, a first resistor R1, a second resistor R2, and a third resistor R3 , the fourth resistor R4, the first transistor T1, and the second transistor T2; the first transistor T1 is an NPN transistor, and the second transistor T2 is a PNP transistor; the second resistor R2 is connected to Between the base and the emitter of the first transistor T1; one end of the first resistor R1 is connected to the base of the first transistor T1, and the other end is connected to the emitter of the second transistor T2 through a switch; The third resistor R3 is connected to the collector of the first transistor T1 and the base of the second transistor T2; the fourth resistor R4 is connected to the base of the first transistor T1 and the second transistor T2 between the collectors; the emitter of the first triode T1 is connected to the negative pole of the battery under test; the emitter of the second triode T2 is connected to the positive pole of the battery under test through a milliampere meter. The discharge circuit includes a fifth resistor R5, a light emitting diode LED1, a capacitor C1 and a third transistor T3; one end of the fifth resistor R5 is connected to the collector of the second transistor T2, and the other end is connected to the anode of the light emitting diode LED1; The third triode T3 is an NPN tube, its collector is connected to the emitter of the second triode T2, and its emitter is connected to the calculation and display circuit; one end of the capacitor C1 is connected to the base of the third triode T3, and the other One end is connected to the negative pole of the battery under test; the cathode of the light-emitting diode LED1 is connected to the negative pole of the battery under test. The calculation and display circuit includes 3 dual-way toggle switches (K1, K2, K3), 3 resistors (R6, R7, R8), a microprocessor, and a display device; the microprocessor uses a single-chip microcomputer, and the display device uses a digital tube to To reduce costs, one way of K1 is connected to the negative pole of the tested battery through R6, and the other is connected to the single-chip microcomputer; one way of K2 is connected to the negative pole of the tested battery through R7, and the other is connected to the single-chip microcomputer; one way of K3 is connected to the negative pole of the tested battery through R8, and the other is connected to the single-chip microcomputer; One end of the resistor R4 connected to the base of the first triode T1 is also connected to the single-chip microcomputer; the single-chip microcomputer is connected to the nixie tube.

The working principle of this example is: the interlock switch circuit is used to realize the control of the cut-off discharge when the voltage of the battery under test is lower than the minimum working voltage, and the actual capacity of the battery under test is calculated by the single-chip computer. Specifically: in the interlock switch circuit part: when the switch SW is pressed, the current of the battery under test forms a loop through the milliampere meter, the first resistor R1, and the second resistor R2; the voltage at point A is divided by the two resistors After the voltage at point A rises, the base voltage of the first transistor T1 also rises, and then it is turned on, and the collector voltage of the first transistor T1 drops, so that the base voltage of the second transistor T2 also drops ; The second transistor T2 is turned on, and its collector voltage is fed back through the fourth resistor R4, so that the base voltage of the first transistor T1 is constant, and the first transistor T1 and the second transistor T2 are kept conducting. The interlock circuit is formed; the release voltage (minimum working voltage) of the interlock switch is determined by the voltage division of the second resistor R2 and the fourth resistor R4, and the ammeter plays a monitoring role in this example.

In the part of the discharge circuit: use the light-emitting diode LED1 as a voltage stabilizer and also as a power indicator to realize constant current discharge. The discharge current is: (LED1 voltage-T3 emitter junction voltage)/the resistance of the load resistor connected to the T3 emitter. It can be seen that the discharge current is determined by the load resistors (R6, R7, R8). The capacitor C1 functions as a filter, and the fifth resistor R5 is a pull-up resistor.

In the calculation and display circuit part: three dual-way toggle switches and three resistors are set, thus forming three different measurement gears. For example, it is 1000mAh, 2000mAh, and 3000mAh in turn, then the value of the load resistor R6 can be realized as follows: calculate the constant discharge current according to the national 0.2C (battery capacity) standard, then the standard discharge circuit for a battery with a capacity of 1000mAh should be : I standard = 0.2C = 0.2*1000mAh = 200mA. Then according to the discharge current = (LED1 voltage - T3 emitter junction voltage) / the resistance of the load resistor connected to the emitter of T3 (this time is the resistance of R6), the resistance value that R6 should be selected can be calculated. For R7, The selection of R8 is also the same as the above process. To test the actual capacity of the battery under test, we need to program the microcontroller first, and use the formula: actual capacity of the battery = actual discharge current × actual discharge time, to obtain the actual capacity of the battery. The actual discharge current is obtained by (LED1 voltage-T3 emitter junction voltage)/the load resistance connected to the T3 emitter. Now the key is how to calculate the actual discharge time: we use the sampling point A to control the timing. , when the SW is pressed, the potential of point A goes up, the interlock switch circuit works, and immediately sends a continuous high-level signal to the single-chip microcomputer, and the single-chip microcomputer makes corresponding timing actions after receiving this signal; when the voltage of the battery under test drops When we set the release voltage of the interlock switch, the interlock switch circuit stops working, the voltage at point A immediately drops to a low level, and this level is sent to the single-chip microcomputer immediately. After the single-chip microcomputer receives this signal, it immediately makes a corresponding timing End the action, so that the actual discharge time can be calculated, and then according to the formula: actual battery capacity = actual discharge current × actual discharge time, the actual capacity of the battery can be calculated, and the final result will be displayed on the digital tube, so that the user can distinguish Find out whether the actual capacity of the battery under test is consistent with the marked capacity.

For the setting of the toggle switch and load resistance, more quantities can be set, so that there are more gears for easy selection, for example, 800mAh, 1200mAh, etc. can also be set. When the user selects the gear, he can only choose one gear for each measurement, otherwise the microcontroller will give an error message and display it on the digital tube for the user to check and adjust.

Claims (6)

1. the battery capacity automatic detection device is characterized in that: comprise interlock switch circuit, discharge circuit and calculate display circuit, described interlock switch circuit connection discharge circuit, discharge circuit connection calculating display circuit.

2. battery capacity automatic detection device as claimed in claim 1 is characterized in that: also comprise milliammeter, described milliammeter one end connects tested anode, and the other end connects the interlock switch circuit.

3. battery capacity automatic detection device as claimed in claim 2 is characterized in that: described interlock switch circuit comprises switch, first resistance, second resistance, the 3rd resistance, the 4th resistance, first triode, second triode; Described first triode is the NPN pipe, and second triode is the PNP pipe; Described second resistance is connected between the base stage and emitter of first triode; Described first resistance, one end connects the base stage of first triode, and the other end connects the emitter of second triode by switch; Described the 3rd resistance connects the base stage of the collector and second triode of first triode; Described the 4th resistance is connected between the collector of the base stage of first triode and second triode; The emitter of described first triode connects the negative pole of tested battery; The emitter of described second triode connects the positive pole of tested battery by milliammeter.

4. battery capacity automatic detection device as claimed in claim 3 is characterized in that: described discharge circuit comprises the 5th resistance, light emitting diode, electric capacity and the 3rd triode; Described the 5th resistance one end connects the collector of second triode, and the other end connects the anode of light emitting diode; Described the 3rd triode is the NPN pipe, and its collector connects the emitter of second triode, and its emitter connects the calculating display circuit; Described electric capacity one end connects the base stage of the 3rd triode, and the other end connects the negative pole of tested battery; The negative electrode of described light emitting diode connects the negative pole of tested battery.

5. battery capacity automatic detection device as claimed in claim 4 is characterized in that: described calculating display circuit comprises N two-way toggle switch, a N resistance, microprocessor, display device; Described N two-way toggle switch connects one to one in the negative pole of tested battery by N resistance, and N two-way toggle switch also connects microprocessor; The end that the 4th resistance is connected with first transistor base also connects microprocessor; Microprocessor connects display device, N 〉=1, and be positive integer.

6. battery capacity automatic detection device as claimed in claim 5 is characterized in that: described microprocessor is that single-chip microcomputer, described display device are charactron.

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