Current detection circuit and energy storage power supply

Abstract

The utility model relates to the technical field of energy storage power supplies, in particular to a current detection circuit and an energy storage power supply. The detection module is used for receiving reference voltage, and the current detection resistor is also connected with the energy storage power supply; the current detection resistor outputs a first voltage to the amplification module according to a current signal output by the energy storage power supply, so that the amplification module outputs a second voltage according to the first voltage; the detection module is used for judging whether the second voltage is larger than the first preset voltage or not when the second voltage is increased and judging whether the second voltage is smaller than the second preset voltage or not when the second voltage is decreased so as to avoid the phenomenon of unstable output caused by burrs and the like. And finally, outputting a driving signal or a standby signal according to a judgment result, thereby reminding a user of the current state of the energy storage power supply based on the driving signal and the standby signal. On the basis, the state detection of the energy storage power supply can be realized through a pure hardware circuit structure, so that the detection period and the detection cost are reduced.

Description

[Technical Field]

[0001] This utility model relates to the technical field of energy storage power supplies, and in particular to a current detection circuit and an energy storage power supply. [Background Technology]

[0002] When charging or discharging energy storage power supplies, it is necessary to provide customers with some simple status indicators. Generally, the current charging or discharging status can be determined by detecting the current magnitude. For example, when the discharge current of the discharging device decreases to a certain value, it can be determined that the discharging device has finished discharging or the load charging has ended. By detecting the current and providing different indicators, users can know the current discharge status of the device.

[0003] The relevant technology mainly involves sampling the voltage of the current-sensing resistor using a processor, comparing the sampled voltage with a reference voltage internally, and outputting corresponding high / low levels to light up the corresponding LED indicators, thereby informing the user of the energy storage power supply's status. However, limitations in the processor's ADC recognition accuracy and the need for software engineers for debugging result in a long processing time and high cost for the processor to detect the energy storage power supply's status. [Utility Model Content]

[0004] This utility model provides a current detection circuit and an energy storage power supply, aiming to solve the technical problems of long state detection cycle and high cost of energy storage power supplies in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a current detection circuit, which includes a current sensing resistor, an amplification module and a detection module;

[0006] The current sensing resistor is connected to the amplification module, the amplification module is connected to the detection module, the detection module is also used to receive a reference voltage, and the current sensing resistor is also connected to the energy storage power supply.

[0007] The current sensing resistor responds to the current signal output by the energy storage power supply and outputs a first voltage to the amplification module based on the current signal, so that the amplification module amplifies the first voltage to obtain a second voltage;

[0008] The detection module is used to receive the second voltage and determine whether the second voltage is greater than a first preset voltage when the second voltage increases, so as to output a drive signal when the second voltage is greater than the first preset voltage; and

[0009] When the second voltage drops, it is determined whether the second voltage is less than the second preset voltage, and when the second voltage is less than the second preset voltage, the drive signal is switched to a standby signal and then output, wherein the first preset voltage is greater than the reference voltage, and the second preset voltage is less than the reference voltage.

[0010] Optionally, the detection module includes a comparator U1B, resistors R1, R2, and R4;

[0011] The non-inverting input of the comparator U1B is connected to the amplification module through the resistor R1. The inverting input of the comparator U1B receives the reference voltage through the resistor R4. The output of the comparator U1B is used to output a signal. The resistor R2 is connected to both the output of the comparator U1B and the non-inverting input of the comparator U1B.

[0012] Optionally, the comparator U1B is used to adjust the first preset voltage and the second preset voltage according to the reference voltage, the resistance value of the resistor R1 and the resistance value of the resistor R2.

[0013] Optionally, the amplification module includes a differential amplifier U1A;

[0014] The two input terminals of the differential amplifier U1A are respectively connected to the two ends of the current sensing resistor, and the output terminal of the differential amplifier U1A is connected to the detection module.

[0015] Optionally, the amplification module further includes a feedback resistor R3;

[0016] The feedback resistor R3 is connected to the output terminal of the differential amplifier U1A and the inverting input terminal of the differential amplifier U1A.

[0017] Optionally, the amplification module further includes a capacitor C2;

[0018] The capacitor C2 is connected in parallel with the feedback resistor R3.

[0019] Optionally, the current detection circuit further includes a display module;

[0020] The display module is connected to the detection module and the first power supply, respectively.

[0021] The display module is used to display a first state when the detection module outputs a drive signal; and

[0022] The second state is displayed when the detection module outputs a standby signal.

[0023] Optionally, the display module includes diode LED1 and diode LED2;

[0024] The anode of diode LED1 is connected to the first power supply, the cathode of diode LED1 is connected to the detection module and the anode of diode LED2 respectively, and the cathode of diode LED2 is used for grounding.

[0025] Optionally, the display module includes diode LED3, diode LED4, resistor R9, and switching transistor Q1;

[0026] The anode of diode LED3 is connected to the first power supply, the cathode of diode LED3 is connected to the detection module and resistor R9 respectively, resistor R9 is connected to the control terminal of switch Q1, the first terminal of switch Q1 is connected to the cathode of diode LED4, the anode of diode LED4 is connected to the first power supply, and the second terminal of switch Q1 is used for grounding.

[0027] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is to provide an energy storage power supply, which includes the current detection circuit described above.

[0028] Unlike related technologies, this utility model provides a current detection circuit and an energy storage power supply. The current detection circuit includes a current sensing resistor, an amplification module, and a detection module. The current sensing resistor is connected to the amplification module, and the amplification module is connected to the detection module. The detection module is also used to receive a reference voltage, and the current sensing resistor is also connected to the energy storage power supply. The current sensing resistor responds to the current signal output by the energy storage power supply and outputs a first voltage to the amplification module based on the current signal. This allows the amplification module to amplify the first voltage to obtain a second voltage, thus avoiding detection errors caused by insufficient voltage across the current sensing resistor. The detection module receives the second voltage and determines whether the second voltage is greater than a first preset voltage when it increases, and whether it is less than a second preset voltage when it decreases. This avoids output instability due to glitches and improves detection accuracy. Finally, a drive signal is output when the second voltage is greater than the first preset voltage, and the drive signal is switched to a standby signal before being output when the second voltage is less than the second preset voltage. This provides the user with the current status of the energy storage power supply based on the drive signal and the standby signal. Wherein, the first preset voltage is greater than the reference voltage, and the second preset voltage is less than the reference voltage. Based on this, the state detection of the energy storage power supply can be achieved through a purely hardware circuit structure, thereby reducing the detection cycle and cost. [Attached Image Description]

[0029] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0030] Figure 1 This is a structural block diagram of an application scenario provided by an embodiment of this utility model;

[0031] Figure 2 This is a structural block diagram of a current detection circuit provided in an embodiment of the present invention;

[0032] Figure 3 This is a circuit diagram of a current detection circuit provided in an embodiment of the present invention;

[0033] Figure 4 This is a circuit diagram of a current detection circuit provided in another embodiment of the present invention.

Detailed Implementation Methods

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0035] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0036] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0037] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0039] Please see Figure 1 , Figure 1 This is a structural block diagram of an application scenario provided by an embodiment of this utility model, such as... Figure 1 As shown, application scenario 1 includes an energy storage power supply 100 and an electrical device 200. The energy storage power supply 100 is connected to the electrical device 200 and is used to supply power to the electrical device 200. However, during the process of the energy storage power supply 100 supplying power to the electrical device 200, it is necessary to monitor the power supply status of the energy storage power supply 100 in real time in order to inform the user of the current operating status of the energy storage power supply 100. Based on this, as... Figure 1 As shown, the energy storage power supply 100 also includes a current detection circuit 10, which is connected to the electrical device 200. When the energy storage power supply 100 supplies power to the electrical device 200, the current detection circuit 10 will detect the output current of the energy storage power supply 100 in real time and give a corresponding status indication based on the magnitude of the output current, thereby indicating the working status of the energy storage power supply 100. The working status includes a discharge state and a static state.

[0040] In some embodiments, the energy storage power supply 100 is also connected to a photovoltaic input source 300 (not shown), and the energy storage power supply 100 is used to receive and store the input voltage of the photovoltaic input source 300. When the photovoltaic input source 300 charges the energy storage power supply 100, the current detection circuit 10 detects the input current of the photovoltaic input source 300 in real time, determines the current state of the energy storage power supply 100 based on the input current, and finally provides a corresponding indication based on the current state. The current state includes a charging state and a static state.

[0041] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a current detection circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the current detection circuit 10 includes a current sensing resistor Rsen, an amplification module 11, and a detection module 12;

[0042] The current sensing resistor Rsen is connected to the amplification module 11, the amplification module 11 is connected to the detection module 12, the detection module 12 is also used to receive the reference voltage, and the current sensing resistor Rsen is also connected to the energy storage power supply 100.

[0043] The current sensing resistor Rsen responds to the current signal output by the energy storage power supply 100 and outputs a first voltage to the amplification module 11 based on the current signal, so that the amplification module 11 amplifies the first voltage to obtain a second voltage;

[0044] The detection module 12 is used to receive the second voltage and determine whether the second voltage is greater than a first preset voltage when the second voltage increases, so as to output a drive signal when the second voltage is greater than the first preset voltage; and

[0045] When the second voltage drops, it is determined whether the second voltage is less than the second preset voltage, and when the second voltage is less than the second preset voltage, the drive signal is switched to a standby signal and then output, wherein the first preset voltage is greater than the reference voltage, and the second preset voltage is less than the reference voltage.

[0046] Specifically, during the process of the energy storage power supply 100 supplying power to the electrical device 200, the output current of the energy storage power supply 100 also flows through the current sensing resistor Rsen. At this time, the current sensing resistor Rsen responds to the output current and outputs a first voltage to the amplification module 11 based on the output current, so that the amplification module 11 amplifies the voltage across the current sensing resistor Rsen, thereby outputting a second voltage. It should be noted that the resistance value of the current sensing resistor Rsen is in the milliohm range, and when the output current of the energy storage power supply 100 flows through the current sensing resistor Rsen, the voltage drop across the current sensing resistor Rsen is also small. Therefore, in order to accurately detect the operating state of the energy storage power supply 100, the amplification module 11 is introduced. When there is a voltage drop across the current sensing resistor Rsen, the amplification module 11 amplifies the voltage drop, thereby improving the accuracy of detection.

[0047] It can be understood that when the energy storage power supply 100 starts working, its output current gradually increases, and the current flowing through the current sensing resistor Rsen also gradually increases, thereby causing the second voltage output by the amplification module 11 to gradually increase. Therefore, during the process of the second voltage gradually increasing, the detection module 12 will determine in real time whether the second voltage is greater than the first preset voltage, and after the second voltage is greater than the first preset voltage, it will output a drive signal to prompt the user that the energy storage power supply 100 is working. After the energy storage power supply 100 stops working, its output current gradually decreases, and the current flowing through the current sensing resistor Rsen also gradually decreases, thereby causing the second voltage output by the amplification module 11 to gradually decrease. At this time, during the process of the second voltage decreasing, the detection module 12 will determine in real time whether the second voltage is less than the second preset voltage, and after the second voltage is less than the second preset voltage, it will switch the drive signal to a standby signal to prompt the user that the energy storage power supply 100 has stopped working. It should be noted that, since the resistance value of the current sensing resistor Rsen is in the milliohm range, the voltage across Rsen is unstable, which may lead to errors in the second voltage output by the amplification module 11. By having the detection module 12 compare the second voltage with different preset values ​​under different operating conditions, the error caused by the current sensing resistor Rsen can be avoided, preventing the output of the detection module 12 from constantly fluctuating and thus improving the accuracy of the current detection circuit.

[0048] In some embodiments, please refer to Figure 3 , Figure 3 This is a circuit diagram of a current detection circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the amplification module 11 includes a differential amplifier U1A;

[0049] The two input terminals of the differential amplifier U1A are respectively connected to the two ends of the current sensing resistor Rsen, and the output terminal of the differential amplifier U1A is connected to the detection module 12. Here, a differential amplifier refers to a device that amplifies the difference between two input signals. Therefore, when current flows through the current sensing resistor Rsen, a corresponding voltage will be generated across it. At this time, the differential amplifier U1A will acquire the voltage drop (first voltage) across the current sensing resistor Rsen, amplify the voltage drop, and finally input the amplified second voltage to the detection module 12.

[0050] In yet another embodiment, such as Figure 3 As shown, the amplification module 11 also includes a feedback resistor R3;

[0051] The feedback resistor R3 is connected to both the output terminal and the inverting input terminal of the differential amplifier U1A. Specifically, the feedback resistor R3 acts as the negative feedback resistor for the differential amplifier U1A, adjusting the voltage at the inverting input terminal to make the output of the differential amplifier U1A more stable.

[0052] In another embodiment, such as Figure 3 As shown, the amplification module also includes a capacitor C2;

[0053] The capacitor C2 is connected in parallel with the feedback resistor R3. The capacitor C2 is a filter capacitor used to filter out high-frequency interference signals to prevent interference to subsequent circuits.

[0054] In some embodiments, the detection module 12 includes a comparator U1B, a resistor R1, a resistor R2, and a resistor R4;

[0055] The non-inverting input of the comparator U1B is connected to the amplification module through the resistor R1. The inverting input of the comparator U1B receives the reference voltage through the resistor R4. The output of the comparator U1B is used to output a signal. The resistor R2 is connected to both the output of the comparator U1B and the non-inverting input of the comparator U1B.

[0056] When the differential amplifier U1A outputs the second voltage, if the energy storage power supply 100 is operating, and the voltage at the non-inverting input of the comparator U1B is greater than the first preset voltage, the comparator U1B will output a drive signal; if the energy storage power supply 100 is not operating, and the second voltage is less than the second preset voltage, the output of the comparator U1B will output a standby signal. It should be noted that the first and second preset voltages are determined based on the reference voltage, the resistance values ​​of resistor R1 and R2, and different anti-interference requirements can be met by adjusting the magnitudes of the first and second preset voltages. The formula for the first and second preset voltages is "resistance value of R1 / resistance value of R2 * (reference voltage - output voltage) + reference voltage". Based on this, the corresponding preset voltage can be obtained when the second voltage increases or decreases.

[0057] In some embodiments, such as Figure 2 As shown, the current detection circuit 10 also includes a display module 13, which is connected to the detection module 12 and the first power supply 51 (not shown).

[0058] The display module 13 is used to display a first state when the detection module 12 outputs a drive signal; and

[0059] The second state is displayed when the detection module 12 outputs a standby signal.

[0060] Specifically, when the detection module 12 outputs a drive signal, the display module 13 will display a first state to indicate to the user that the energy storage power supply 100 is working; and when the detection module 12 outputs a standby signal, the display module 13 will display a second state to indicate to the user that the energy storage power supply 100 is in standby mode. The first power supply 51 is mainly used to provide operating voltage to the display module 13, and its voltage value can be determined according to the model of the display module 13.

[0061] In some embodiments, such as Figure 3 As shown, the display module 13 includes diode LED1 and diode LED2;

[0062] The anode of diode LED1 is connected to the first power supply 51, the cathode of diode LED1 is connected to the detection module 12 and the anode of diode LED2 respectively, and the cathode of diode LED2 is used for grounding.

[0063] When the detection module 12 outputs a drive signal, diode LED1 remains off due to the lack of voltage drop, while diode LED2 illuminates due to the presence of voltage drop. Conversely, when the detection module 12 outputs a standby signal, diode LED1 illuminates due to the presence of voltage drop, while diode LED2 remains off due to the lack of voltage drop. Based on this, different displays can be provided under different operating conditions of the energy storage power supply 100.

[0064] In another embodiment, in order to ensure that the current detection circuit 10 can provide different prompts in different states of the energy storage power supply 100, the lighting colors of the diodes LED1 and LED2 can be set to different colors, for example, the diode LED1 is red and the diode LED2 is green.

[0065] It should be noted that the comparator U1B is divided into two types: "rail-to-rail op-amp" and "non-rail-to-rail op-amp". "Rail-to-rail op-amp" refers to an op-amp whose input or output signal can approach the extreme values ​​of the power supply; while "non-rail-to-rail op-amp" refers to an op-amp whose input and output voltage ranges cannot reach the boundaries of the power supply voltage. Since "rail-to-rail op-amps" are more expensive than "non-rail-to-rail op-amps", when using a "non-rail-to-rail op-amp", a switching transistor Q1 can be introduced to ensure that the brightness of the two LEDs is consistent, thus preventing inconsistencies between the two LEDs.

[0066] For details, please refer to Figure 4 , Figure 4 This is a circuit diagram of a current detection circuit provided in another embodiment of this utility model, as shown below. Figure 4 As shown, the display module 13 includes diode LED3, diode LED4, resistor R9, and switching transistor Q1;

[0067] The anode of diode LED3 is connected to the first power supply 51, the cathode of diode LED3 is connected to the detection module 12 and resistor R9 respectively, the resistor R9 is connected to the control terminal of switch Q1, the first terminal of switch Q1 is connected to the cathode of diode LED4, the anode of diode LED4 is connected to the first power supply 51, and the second terminal of switch Q1 is used for grounding.

[0068] When the detection module 12 outputs a drive signal, the switch Q1 will turn on based on the drive signal, causing diode LED4 to light up, while diode LED3 will turn off due to the lack of voltage drop. Conversely, when the detection module 12 outputs a standby signal, diode LED3 will light up, while switch Q1 will be in the off state, thus diode LED4 will turn off. This ensures that both diodes LED3 and LED4 light up and turn off based on the first power supply 51, thereby guaranteeing that the brightness of the two LEDs is consistent.

[0069] In another embodiment, such as Figure 3 As shown, when the energy storage power supply 100 is working, the current in the sensing resistor Rsen continuously increases, and the voltage in the current sensing resistor Rsen also continuously increases. The differential amplifier U1A collects the voltage in the current sensing resistor Rsen in real time, amplifies the voltage, and finally inputs the amplified voltage to the comparator U1B. When the comparator U1B receives the second voltage, it determines the magnitude of the second voltage and the first preset voltage. When the second voltage is greater than the first preset voltage, it drives the diode LED2 to light up to indicate to the user that the energy storage power supply 100 is working. When the energy storage power supply 100 stops working, the current in the current sensing resistor Rsen continuously decreases, and the second voltage output by the differential amplifier U1A also continuously decreases. When the second voltage is less than the second preset voltage, the comparator U1B outputs a standby signal to the display module 13 to turn off the diode LED2 and turn on the diode LED1. Based on this, the operating condition of the energy storage power supply 100 can be determined based on the output current of the energy storage power supply 100, and the current operating condition of the energy storage power supply 100 can be prompted to the user, thereby reducing costs and improving the safety of the energy storage power supply.

[0070] This invention provides a current detection circuit, comprising a current sensing resistor, an amplification module, and a detection module. The current sensing resistor is connected to the amplification module, which in turn is connected to the detection module. The detection module also receives a reference voltage, and the current sensing resistor is connected to an energy storage power supply. The current sensing resistor responds to the current signal output by the energy storage power supply and outputs a first voltage to the amplification module based on the current signal. This amplifies the first voltage to obtain a second voltage, thus avoiding detection errors caused by insufficient voltage across the current sensing resistor. The detection module receives the second voltage and determines whether it is greater than a first preset voltage when the second voltage increases and whether it is less than a second preset voltage when the second voltage decreases. This avoids output instability due to glitches and improves detection accuracy. Finally, a drive signal is output when the second voltage is greater than the first preset voltage, and a standby signal is switched to the drive signal when the second voltage is less than the second preset voltage. This provides the user with the current status of the energy storage power supply based on the drive signal and the standby signal. Wherein, the first preset voltage is greater than the reference voltage, and the second preset voltage is less than the reference voltage. Based on this, the state detection of the energy storage power supply can be achieved through a purely hardware circuit structure, thereby reducing the detection cycle and cost.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A current detection circuit, characterized in that, The current detection circuit includes a current sensing resistor, an amplification module, and a detection module; The current sensing resistor is connected to the amplification module, the amplification module is connected to the detection module, the detection module is also used to receive a reference voltage, and the current sensing resistor is also connected to the energy storage power supply. The current sensing resistor responds to the current signal output by the energy storage power supply and outputs a first voltage to the amplification module based on the current signal, so that the amplification module amplifies the first voltage to obtain a second voltage; The detection module is used to receive the second voltage and determine whether the second voltage is greater than a first preset voltage when the second voltage increases, so as to output a drive signal when the second voltage is greater than the first preset voltage; as well as When the second voltage drops, it is determined whether the second voltage is less than the second preset voltage, and when the second voltage is less than the second preset voltage, the drive signal is switched to a standby signal and then output, wherein the first preset voltage is greater than the reference voltage, and the second preset voltage is less than the reference voltage.

2. The current detection circuit according to claim 1, characterized in that, The detection module includes a comparator U1B, resistors R1, R2, and R4; The non-inverting input of the comparator U1B is connected to the amplification module through the resistor R1. The inverting input of the comparator U1B receives the reference voltage through the resistor R4. The output of the comparator U1B is used to output a signal. The resistor R2 is connected to both the output of the comparator U1B and the non-inverting input of the comparator U1B.

3. The current detection circuit according to claim 2, characterized in that, The comparator U1B is used to adjust the first preset voltage and the second preset voltage according to the reference voltage, the resistance value of the resistor R1 and the resistance value of the resistor R2.

4. The current detection circuit according to claim 1, characterized in that, The amplification module includes a differential amplifier U1A; The two input terminals of the differential amplifier U1A are respectively connected to the two ends of the current sensing resistor, and the output terminal of the differential amplifier U1A is connected to the detection module.

5. The current detection circuit according to claim 4, characterized in that, The amplification module also includes a feedback resistor R3; The feedback resistor R3 is connected to the output terminal of the differential amplifier U1A and the inverting input terminal of the differential amplifier U1A.

6. The current detection circuit according to claim 5, characterized in that, The amplification module also includes capacitor C2; The capacitor C2 is connected in parallel with the feedback resistor R3.

7. The current detection circuit according to any one of claims 1-6, characterized in that, The current detection circuit also includes a display module; The display module is connected to the detection module and the first power supply, respectively. The display module is used to display a first state when the detection module outputs a drive signal; and The second state is displayed when the detection module outputs a standby signal.

8. The current detection circuit according to claim 7, characterized in that, The display module includes diode LED1 and diode LED2; The anode of diode LED1 is connected to the first power supply, the cathode of diode LED1 is connected to the detection module and the anode of diode LED2 respectively, and the cathode of diode LED2 is used for grounding.

9. The current detection circuit according to claim 7, characterized in that, The display module includes diode LED3, diode LED4, resistor R9, and switching transistor Q1; The anode of diode LED3 is connected to the first power supply, the cathode of diode LED3 is connected to the detection module and resistor R9 respectively, resistor R9 is connected to the control terminal of switch Q1, the first terminal of switch Q1 is connected to the cathode of diode LED4, the anode of diode LED4 is connected to the first power supply, and the second terminal of switch Q1 is used for grounding.

10. An energy storage power source, characterized in that, The energy storage power supply includes the current detection circuit as described in any one of claims 1-9.

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