Battery electric quantity test circuit capable of taking power from to-be-tested battery for power supply

Abstract

The utility model discloses a battery electric quantity test circuit capable of taking and supplying power from a to-be-tested battery, which comprises an input side detection part and an output side detection part, and is characterized in that the input side detection part comprises two detection ends which are respectively connected with the positive electrode and the negative electrode of the to-be-tested battery; the output side detection part comprises three detection ends, one detection end is connected with the positive electrode detection end of the input side detection part, and the other two detection ends are respectively connected with the positive electrode and the negative electrode of a load to be detected; the input side detection part is sequentially connected with a power taking circuit for taking power from a battery and then supplying power, a voltage and current sampling and amplifying circuit which is respectively connected with the output side detection part and the power taking circuit and is used for sampling and amplifying voltage and current of the battery, and a main control circuit for calculating the electric quantity of the battery according to the sampled voltage and current; the electricity taking circuit supplies power to the main control circuit, the function that electricity can be directly taken from the battery to be tested to enable the test circuit to be powered on to work is achieved, the whole machine circuit structure is simple, and the voltage and current test range is large.

Description

[Technical Field]

[0001] This utility model relates to a battery power testing circuit that can draw power from the battery under test. [Background Technology]

[0002] Existing current and voltage testers for battery testing all require a separate power supply, such as a battery or adapter, to power the tester. However, when using a battery, it is necessary to ensure sufficient power supply while minimizing energy consumption in standby mode. This presents challenges, including the need to consider standby power consumption during the design phase and the potential for insufficient battery power to prevent test operation. On the other hand, using an adapter requires connection to a socket, which can be inconvenient for relocation. [Utility Model Content]

[0003] This invention overcomes the shortcomings of the prior art and provides a battery power testing circuit that can draw power from the battery under test.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A battery power testing circuit capable of drawing power from a battery under test is characterized by comprising an input-side detection unit and an output-side detection unit. The input-side detection unit includes two detection terminals connected to the positive and negative terminals of the battery under test, respectively. The output-side detection unit includes three detection terminals, one of which is connected to the positive detection terminal of the input-side detection unit, and the other two detection terminals are connected to the positive and negative terminals of the load under test, respectively. The input-side detection unit is sequentially connected to a power-drawing circuit for drawing power from the battery, a voltage and current sampling and amplification circuit connected to the output-side detection unit and the power-drawing circuit for sampling and amplifying the battery voltage and current, a main control circuit for calculating the battery power based on the sampled voltage and current, and a display circuit for displaying the battery power. The power-drawing circuit supplies power to the main control circuit.

[0006] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the input side detection unit includes a connection terminal CN1, and pins 1 and 2 of the connection terminal CN1 serve as two detection terminals of the input side detection unit, which are respectively connected to the positive terminal and the negative terminal of the battery under test.

[0007] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the output side detection unit includes a connection terminal CN2, and pins 1, 2 and 3 of the connection terminal CN2 serve as three detection terminals of the output side detection unit. Pin 1 of the connection terminal CN2 is connected to pin 1 of the connection terminal CN1 and one end of capacitor C1, and the other end of capacitor C1 is grounded. Pins 2 and 3 of the connection terminal CN2 are connected to the positive and negative terminals of the load under test, respectively.

[0008] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the power drawing circuit includes a power control chip U3; pin 3 of the power control chip U3 is connected to one end of capacitor C2, the positive terminal of electrolytic capacitor C5, and the negative terminal of diode D1; the other end of capacitor C2 and the negative terminal of electrolytic capacitor C5 are grounded; the positive terminal of diode D1 is connected to the positive terminal of the battery under test, one end of capacitor C6, and one end of resistor R2; the other end of capacitor C6 is grounded; the other end of resistor R2 is connected to one end of resistor R7, one end of capacitor C15, the negative terminal of diode D3, and the main control circuit; the other end of resistor R7, the other end of capacitor C15, and the positive terminal of diode D3 are grounded; pin 4 of the power control chip U3 is connected to pin 5 of the power control chip U3 through capacitor C9; pin 5 of the power control chip U3 is connected to the diode... The negative terminal of diode D2, one end of capacitor C3, and one end of inductor L1 are connected. The positive terminal of diode D2 is grounded. The other end of capacitor C3 is connected through resistor R3 to one end of resistor R1, one end of resistor R6, pin 1 of power control chip U3, one end of capacitor C4, and one end of capacitor C12. The other end of resistor R1 is connected to the other end of capacitor C4, one end of capacitor C11, the positive terminal of electrolytic capacitor C7, one end of capacitor C10, and one end of capacitor C8. The other ends of resistor R6, the other ends of capacitor C12, the other ends of capacitor C11, the negative terminal of electrolytic capacitor C7, the other end of capacitor C10, and the other end of capacitor C8 are grounded. The other end of inductor L1 outputs power supply VDD to the voltage and current sampling and amplification circuit and the main control circuit. Pins 6 and 7 of power control chip U3 are connected, and pins 8 and 9 of power control chip U3 are grounded.

[0009] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the voltage and current sampling and amplification circuit includes operational amplifiers U2A and U2B. Pin 1 of operational amplifier U2A is connected to one end of resistor R25, one end of capacitor C23, and one end of resistor R9. The other end of resistor R9 is connected to the main control circuit and one end of capacitor C4. The other end of capacitor C4 is grounded. The other end of resistor R25 is connected to the other end of capacitor C23, one end of resistor R8, and pin 2 of operational amplifier U2A. The other end of resistor R8 is grounded. Pin 4 of operational amplifier U2A is grounded. Pin 8 of operational amplifier U2A is connected to the power-drawing circuit. Pin 3 of operational amplifier U2A is connected to one end of resistor R5 and one end of capacitor C13. The other end of resistor R5... One end of the resistor is connected to one end of resistor KR2, the output detection unit, and one end of resistor KR1. The other end of resistor KR2 and the other end of capacitor C13 are grounded. The other end of resistor KR1 is connected to one end of resistor R4 and the output detection unit. The other end of resistor R4 is connected to pin 5 of op-amp U2B and one end of capacitor C14. The other end of capacitor C14 is grounded. Pin 6 of op-amp U2B is connected to one end of resistor R15, one end of capacitor C17, and one end of resistor R19. The other end of resistor R15 is grounded. Pin 7 of op-amp U2B is connected to one end of resistor R18, the other end of capacitor C17, and the other end of resistor R19. The other end of resistor R18 is connected to the main control circuit and one end of capacitor C18. The other end of capacitor C18 is grounded.

[0010] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the main control circuit includes a main control chip U1, pin 1 of the main control chip U1 is connected to one end of capacitor C16 in the power drawing circuit, the other end of capacitor C16 is grounded, pins 4-7 and 8-10 of the main control chip U1 are connected to the display circuit, pins 11-12 of the main control chip U1 are connected to the voltage and current sampling and amplification circuit, pin 13 of the main control chip U1 is connected to the power drawing circuit, and pin 14 of the main control chip U1 is grounded.

[0011] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the display circuit is a digital tube or an LCD display.

[0012] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the main control circuit is connected to a programming connection port for programming.

[0013] The battery power testing circuit described above, which can draw power from the battery under test, is characterized in that: the programming connection port includes a connection terminal CN3, pin 1 of the connection terminal CN3 is grounded, pin 2 of the connection terminal CN3 outputs power externally, and pins 3 and 4 of the connection terminal CN3 are respectively connected to pins 2 and 3 of the main control chip U1.

[0014] The beneficial effects of this utility model are:

[0015] This invention includes an input-side detection unit connected to the battery under test, an output-side detection unit connected to the load under test, a power-drawing circuit that draws power from the battery under test and supplies power to the voltage and current sampling and amplification circuit and the main control circuit, a voltage and current sampling and amplification circuit that samples and amplifies the voltage and current of the input-side and output-side detection units, a main control circuit that calculates the battery charge based on the sampled voltage and current, and a display circuit that displays the battery charge. This invention enables the test circuit to operate directly by drawing power from the battery under test, eliminating the need for a separate battery or adapter and the need to consider standby power consumption. It is easy to use and has a lower cost. At the same time, the overall circuit structure is simple and the voltage and current testing range is large. [Image Description]

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is a circuit diagram of the input-side detection unit of this utility model;

[0018] Figure 3 This is a circuit diagram of the output-side detection unit of this utility model;

[0019] Figure 4 This is the power supply circuit diagram for this utility model;

[0020] Figure 5 This is a circuit diagram of the voltage and current sampling and amplification circuit of this utility model;

[0021] Figure 6 This is the main control circuit diagram of this utility model;

[0022] Figure 7 This is the display circuit diagram of this utility model;

[0023] Figure 8 This is the circuit diagram for the programming connection port of this utility model. [Detailed Implementation]

[0024] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0026] like Figure 1-8 As shown, a battery power testing circuit capable of drawing power from a battery under test includes an input-side detection unit 1 and an output-side detection unit 2. The input-side detection unit 1 has two detection terminals, which are respectively connected to the positive and negative terminals of the battery under test. The output-side detection unit 2 has three detection terminals, one of which is connected to the positive detection terminal of the input-side detection unit 1, and the other two detection terminals are respectively connected to the positive and negative terminals of the load under test. The input-side detection unit 1 is sequentially connected to a power-drawing circuit 3 for drawing power from the battery, a voltage and current sampling and amplification circuit 4 connected to the output-side detection unit 2 and the power-drawing circuit 3 for sampling and amplifying the battery voltage and current, a main control circuit 5 for calculating the battery power based on the sampled voltage and current, and a display circuit 6 for displaying the battery power. The power-drawing circuit 3 supplies power to the main control circuit 5.

[0027] In actual use, the two detection terminals of the input-side detection unit 1 are connected to the positive and negative terminals of the battery under test, respectively, and the two detection terminals of the output-side detection unit 2 are connected to the positive and negative terminals of the load under test, thereby generating an output current from the battery under test. At this time, the power-taking circuit 3 draws power from the battery under test through the input-side detection unit 1, converts the drawn voltage to VDD, and supplies power to the main control circuit 5, thereby energizing the battery charge testing circuit. Simultaneously, the voltage and current sampling and amplification circuit 4 samples the voltage and current sampling signals of the battery under test through the power-taking circuit 3 and the output-side detection unit 2, amplifies them, and sends them to the main control circuit 5. The main control circuit 5 calculates the charge of the battery under test based on the voltage and current sampling signals, and finally displays the battery voltage, current, and charge information through the display circuit 6. In this case, if only the voltage of the battery under test needs to be tested, only the two detection terminals of the input-side detection unit 1 need to be connected to the positive and negative terminals of the battery under test, respectively. The two detection terminals of the output-side detection unit 2 do not need to be connected to the load under test, and finally the display circuit 6 only displays the battery voltage information.

[0028] like Figure 2As shown, the input-side detection unit 1 includes a connection terminal CN1. Pins 1 and 2 of the connection terminal CN1 serve as two detection terminals of the input-side detection unit 1, and are respectively connected to the positive and negative terminals of the battery under test. In use, conductive clips can be connected to pins 1 and 2 of the connection terminal CN1, and the positive and negative terminals of the battery under test can be clamped respectively.

[0029] like Figure 3 As shown, the output-side detection unit 2 includes a connection terminal CN2. Pins 1, 2, and 3 of the connection terminal CN2 serve as the three detection terminals of the output-side detection unit 2. Pin 1 of the connection terminal CN2 is connected to pin 1 of the connection terminal CN1 and one end of capacitor C1, respectively. The other end of capacitor C1 is grounded. Pins 2 and 3 of the connection terminal CN2 are connected to the positive and negative terminals of the load under test, respectively. In use, conductive clips can be connected to pins 2 and 3 of the connection terminal CN2 to clamp the positive and negative terminals of the load under test, respectively.

[0030] like Figure 4As shown, the power supply circuit 3 includes a power control chip U3. Pin 3 of the power control chip U3 is connected to one end of capacitor C2, the positive terminal of electrolytic capacitor C5, and the negative terminal of diode D1, respectively. The other end of capacitor C2 and the negative terminal of electrolytic capacitor C5 are grounded. The positive terminal of diode D1 is connected to the positive terminal of the battery under test, one end of capacitor C6, and one end of resistor R2, respectively. The other end of capacitor C6 is grounded. The other end of resistor R2 is connected to one end of resistor R7, one end of capacitor C15, the negative terminal of diode D3, and the main control circuit 5, respectively. The other end of resistor R7, the other end of capacitor C15, and the positive terminal of diode D3 are grounded. Pin 4 of the power control chip U3 is connected to pin 5 of the power control chip U3 through capacitor C9. Pin 5 of the power control chip U3 is connected to the negative terminal of diode D2, one end of capacitor C3, and the positive terminal of the battery under test. One end of inductor L1 is connected, the positive terminal of diode D2 is grounded, and the other end of capacitor C3 is connected to one end of resistor R1, one end of resistor R6, pin 1 of power control chip U3, one end of capacitor C4, and one end of capacitor C12 through resistor R3. The other end of resistor R1 is connected to the other end of capacitor C4, one end of capacitor C11, the positive terminal of electrolytic capacitor C7, one end of capacitor C10, and one end of capacitor C8. The other ends of resistor R6, the other ends of capacitor C12, the other ends of capacitor C11, the negative terminal of electrolytic capacitor C7, the other end of capacitor C10, and the other end of capacitor C8 are grounded. The power supply VDD output from the other end of inductor L1 supplies power to voltage and current sampling and amplification circuit 4 and main control circuit 5. Pins 6 and 7 of power control chip U3 are connected, and pins 8 and 9 of power control chip U3 are grounded. In use, the power control chip U3 and related components draw power from the battery under test through the connection terminal CN1, filter and step down the battery voltage to convert it into power supply VDD, and then supply power to the main control circuit 5 to enable the test circuit to operate. In this case, the power supply circuit 3 can draw DC4-100V from the battery under test and step down DC4-100V to DC2-4V to supply power to the main control circuit 5.

[0031] like Figure 5As shown, the voltage and current sampling and amplification circuit 4 includes operational amplifiers U2A and U2B. Pin 1 of operational amplifier U2A is connected to one end of resistor R25, one end of capacitor C23, and one end of resistor R9. The other end of resistor R9 is connected to the main control circuit 5 and one end of capacitor C4. The other end of capacitor C4 is grounded. The other end of resistor R25 is connected to the other end of capacitor C23, one end of resistor R8, and pin 2 of operational amplifier U2A. The other end of resistor R8 is grounded. Pin 4 of operational amplifier U2A is grounded. Pin 8 of operational amplifier U2A is connected to the power supply circuit 3. Pin 3 of operational amplifier U2A is connected to one end of resistor R5 and one end of capacitor C13. The other end of resistor R5 is connected to one end of resistor KR2 and the output side... The detection unit 2 is connected to one end of resistor KR1. The other end of resistor KR2 and the other end of capacitor C13 are grounded. The other end of resistor KR1 is connected to one end of resistor R4 and the output detection unit 2. The other end of resistor R4 is connected to pin 5 of op-amp U2B and one end of capacitor C14. The other end of capacitor C14 is grounded. Pin 6 of op-amp U2B is connected to one end of resistor R15, one end of capacitor C17, and one end of resistor R19. The other end of resistor R15 is grounded. Pin 7 of op-amp U2B is connected to one end of resistor R18, the other end of capacitor C17, and the other end of resistor R19. The other end of resistor R18 is connected to the main control circuit 5 and one end of capacitor C18. The other end of capacitor C18 is grounded. In use, op-amp U2A, op-amp U2B, and related components sample the sampling voltage signal of the input detection unit 1 and the sampling current signal of the output detection unit 2, respectively, and amplify the sampled voltage and current signals before outputting them to the main control circuit 5.

[0032] like Figure 6 As shown, the main control circuit 5 includes a main control chip U1. Pin 1 of the main control chip U1 is connected to one end of capacitor C16 in the power supply circuit 3, and the other end of capacitor C16 is grounded. Pins 4-7 and 8-10 of the main control chip U1 are connected to the display circuit 6. Pins 11-12 of the main control chip U1 are connected to the voltage and current sampling and amplification circuit 4. Pin 13 of the main control chip U1 is connected to the power supply circuit 3, and pin 14 of the main control chip U1 is grounded. In use, the main control chip U1 receives the amplified voltage and current sampling signals and calculates the voltage, current, and charge of the battery under test based on the sampling signals.

[0033] like Figure 7 As shown, display circuit 6 is a digital tube or LCD display. In use, the voltage, current, and power information calculated by the main control chip U1 are displayed through the digital tube or LCD display.

[0034] like Figure 1 and Figure 8As shown, the control circuit 5 is connected to a programming connection port 7 for programming. The programming connection port 7 includes a connection terminal CN3, pin 1 of which is grounded, pin 2 of which outputs power, and pins 3 and 4 of which are connected to pins 2 and 3 of the main control chip U1, respectively. During programming, the program is programmed to the main control chip U1 through the programming connection port 7.

[0035] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery capacity testing circuit that can draw power from the battery under test, characterized in that: It includes an input-side detection unit (1) and an output-side detection unit (2). The input-side detection unit (1) has two detection terminals that are respectively connected to the positive and negative terminals of the battery under test. The output-side detection unit (2) has three detection terminals, one of which is connected to the positive detection terminal of the input-side detection unit (1), and the other two detection terminals are respectively connected to the positive and negative terminals of the load under test. The input-side detection unit (1) is sequentially connected to a power-drawing circuit (3) for powering the battery, a voltage and current sampling and amplification circuit (4) for sampling and amplifying the battery voltage and current, which is connected to the output-side detection unit (2) and the power-drawing circuit (3) respectively, a main control circuit (5) for calculating the battery power based on the sampled voltage and current, and a display circuit (6) for displaying the battery power. The power-drawing circuit (3) supplies power to the main control circuit (5).

2. The battery power testing circuit according to claim 1, which can draw power from the battery under test, is characterized in that: The input-side detection unit (1) includes a connection terminal CN1. Pin 1 and pin 2 of the connection terminal CN1 serve as two detection terminals of the input-side detection unit (1) and are respectively connected to the positive and negative terminals of the battery under test.

3. A battery power testing circuit capable of drawing power from the battery under test according to claim 2, characterized in that: The output side detection unit (2) includes a connection terminal CN2. Pins 1, 2 and 3 of the connection terminal CN2 serve as the three detection terminals of the output side detection unit (2). Pin 1 of the connection terminal CN2 is connected to pin 1 of the connection terminal CN1 and one end of the capacitor C1, respectively. The other end of the capacitor C1 is grounded. Pins 2 and 3 of the connection terminal CN2 are connected to the positive and negative terminals of the load under test, respectively.

4. A battery power testing circuit capable of drawing power from the battery under test according to claim 1, characterized in that: The power supply circuit (3) includes a power control chip U3. Pin 3 of the power control chip U3 is connected to one end of capacitor C2, the positive terminal of electrolytic capacitor C5, and the negative terminal of diode D1. The other end of capacitor C2 and the negative terminal of electrolytic capacitor C5 are grounded. The positive terminal of diode D1 is connected to the positive terminal of the battery under test, one end of capacitor C6, and one end of resistor R2. The other end of capacitor C6 is grounded. The other end of resistor R2 is connected to one end of resistor R7, one end of capacitor C15, the negative terminal of diode D3, and the main control circuit (5). The other end of resistor R7, the other end of capacitor C15, and the positive terminal of diode D3 are grounded. Pin 4 of the power control chip U3 is connected to pin 5 of the power control chip U3 through capacitor C9. Pin 5 of the power control chip U3 is connected to the negative terminal of diode D2, one end of capacitor C3, and the inductor. One end of L1 is connected, the positive terminal of diode D2 is grounded, the other end of capacitor C3 is connected to one end of resistor R1, one end of resistor R6, pin 1 of power control chip U3, one end of capacitor C4, and one end of capacitor C12 through resistor R3. The other end of resistor R1 is connected to the other end of capacitor C4, one end of capacitor C11, the positive terminal of electrolytic capacitor C7, one end of capacitor C10, and one end of capacitor C8. The other end of resistor R6, the other end of capacitor C12, the other end of capacitor C11, the negative terminal of electrolytic capacitor C7, the other end of capacitor C10, and the other end of capacitor C8 are grounded. The other end of inductor L1 outputs power supply VDD to the voltage and current sampling and amplification circuit (4) and the main control circuit (5). Pins 6 and 7 of power control chip U3 are connected, and pins 8 and 9 of power control chip U3 are grounded.

5. A battery power testing circuit capable of drawing power from the battery under test according to claim 1, characterized in that: The voltage and current sampling and amplification circuit (4) includes operational amplifiers U2A and U2B. Pin 1 of operational amplifier U2A is connected to one end of resistor R25, one end of capacitor C23, and one end of resistor R9. The other end of resistor R9 is connected to the main control circuit (5) and one end of capacitor C4. The other end of capacitor C4 is grounded. The other end of resistor R25 is connected to the other end of capacitor C23, one end of resistor R8, and pin 2 of operational amplifier U2A. The other end of resistor R8 is grounded. Pin 4 of operational amplifier U2A is grounded. Pin 8 of operational amplifier U2A is connected to the power supply circuit (3). Pin 3 of operational amplifier U2A is connected to one end of resistor R5 and one end of capacitor C13. The other end of resistor R5 is connected to one end of resistor KR2 and one end of output detection circuit (3). The measuring unit (2) is connected to one end of resistor KR1, the other end of resistor KR2 and the other end of capacitor C13 are respectively grounded, the other end of resistor KR1 is connected to one end of resistor R4 and the output side measuring unit (2), the other end of resistor R4 is connected to pin 5 of op-amp U2B and one end of capacitor C14, the other end of capacitor C14 is grounded, pin 6 of op-amp U2B is connected to one end of resistor R15, one end of capacitor C17 and one end of resistor R19, the other end of resistor R15 is grounded, pin 7 of op-amp U2B is connected to one end of resistor R18, the other end of capacitor C17 and the other end of resistor R19, the other end of resistor R18 is connected to the main control circuit (5) and one end of capacitor C18, the other end of capacitor C18 is grounded.

6. A battery power testing circuit capable of drawing power from the battery under test according to claim 1, characterized in that: The main control circuit (5) includes a main control chip U1. Pin 1 of the main control chip U1 is connected to one end of capacitor C16 of the power supply circuit (3), and the other end of capacitor C16 is grounded. Pins 4-7 and 8-10 of the main control chip U1 are connected to the display circuit (6), pins 11-12 of the main control chip U1 are connected to the voltage and current sampling and amplification circuit (4), pin 13 of the main control chip U1 is connected to the power supply circuit (3), and pin 14 of the main control chip U1 is grounded.

7. A battery power testing circuit capable of drawing power from the battery under test according to claim 1, characterized in that: The display circuit (6) is a digital tube or LCD display.

8. A battery power testing circuit capable of drawing power from the battery under test according to claim 6, characterized in that: The main control circuit (5) is connected to a programming connection port (7) for programming.

9. A battery power testing circuit that can draw power from the battery under test according to claim 8, characterized in that: The programming connection port (7) includes a connection terminal CN3. Pin 1 of the connection terminal CN3 is grounded, pin 2 of the connection terminal CN3 outputs power, and pins 3 and 4 of the connection terminal CN3 are connected to pins 2 and 3 of the main control chip U1, respectively.

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