Detection circuit and emergency power supply

Abstract

The utility model relates to the technical field of power supplies, and discloses a detection circuit and an emergency power supply, the provided detection circuit comprises a charging interface circuit, a sampling circuit and a current detection circuit, the positive electrode of the charging interface circuit is connected with a battery pack to be charged; the first end of the sampling circuit is connected with the cathode of the charging interface circuit, and the second end is connected with the grounding end. The first end of the current detection circuit is connected with the first end of the sampling circuit, the second end of the current detection circuit is connected with the grounding end, the current detection circuit detects the current corresponding to the first end of the sampling circuit and generates a current detection signal, and the third end of the current detection circuit outputs the current detection signal. According to the detection circuit, the reference points of the charging interface circuit, the sampling circuit and the current detection circuit are unified as ground wire potentials, so that the problem of inconsistent ground wire potentials is effectively solved, noise and interference are reduced, and the safety and stability of the applied emergency power supply are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a detection circuit and an emergency power supply. Background Technology

[0002] With the rapid development and widespread adoption of emergency power supplies, charging technology is playing an increasingly important role in various devices. Efficient charging management and accurate current detection are crucial for ensuring the safe and stable operation of emergency power supplies. Traditional current detection schemes typically employ a two-ground system, where the charger ground is separated from the ground of the main control MCU and the corresponding detection circuit. While this design can meet basic current detection requirements in some cases, the two-ground system is prone to inconsistent ground potentials, introducing noise and interference.

[0003] Therefore, there is an urgent need for a detection circuit to solve the problem of inconsistent ground potential caused by current detection schemes in two-ground-wire systems, which introduces noise and interference. Utility Model Content

[0004] This invention provides a detection circuit and an emergency power supply, which aims to solve the problem of inconsistent ground potential caused by the current detection scheme of a two-ground-wire system, thereby introducing noise and interference.

[0005] In a first aspect, this utility model provides a detection circuit, comprising:

[0006] A charging interface circuit, wherein the positive terminal of the charging interface circuit is connected to the battery pack to be charged;

[0007] A sampling circuit, wherein the first terminal of the sampling circuit is connected to the negative terminal of the charging interface circuit, and the second terminal of the sampling circuit is connected to the ground terminal;

[0008] A current detection circuit is provided, wherein a first terminal of the current detection circuit is connected to a first terminal of the sampling circuit, a second terminal of the current detection circuit is connected to a ground terminal, the current detection circuit detects the current corresponding to the first terminal of the sampling circuit and generates a current detection signal, and a third terminal of the current detection circuit outputs the current detection signal.

[0009] In some embodiments, the system further includes: a control circuit, wherein a third terminal of the current detection circuit is connected to a first terminal of the control circuit, the current detection signal is input to the control circuit via the third terminal of the current detection circuit, and a second terminal of the control circuit is connected to the ground terminal; and a first switching circuit, wherein the first switching circuit is connected between the positive terminal of the charging interface circuit and the battery pack; wherein the third terminal of the control circuit is connected to the controlled terminal of the switching circuit, and if the current detection signal meets a first charging condition, the control circuit sends a first conduction signal to the controlled terminal of the first switching circuit, the first switching circuit conducts in response to the first conduction signal, and the battery pack enters a charging state.

[0010] For example, the first charging condition includes the detection current value corresponding to the current detection signal being less than a first preset current value.

[0011] For example, the fourth terminal of the control circuit is connected to the battery pack. After the control circuit is successfully connected to the battery pack, it obtains the first voltage detection signal corresponding to the battery pack through the fourth terminal. When the switching circuit is turned on in response to the first turn-on signal, if the battery pack voltage and the current detection signal meet the conditions for stopping charging, the control circuit sends a first turn-off signal to the controlled terminal of the first switching circuit. The first switching circuit turns off in response to the first turn-off signal, and the battery pack stops charging.

[0012] It should be noted that, in some embodiments, the charging stop condition includes the detection current value corresponding to the current detection signal being less than the second preset current value, and the detection voltage value corresponding to the first voltage detection signal being not less than the first preset voltage value.

[0013] For example, it further includes: a voltage detection circuit, the first terminal of which is connected to the positive terminal of the charging interface circuit, the second terminal of which is connected to the ground terminal, and the fifth terminal of the control circuit. The voltage detection circuit detects the voltage corresponding to the positive terminal of the charging interface circuit and outputs a second voltage detection signal to the fifth terminal of the control circuit; a second switching circuit, which is connected between the positive terminal of the charging interface circuit and the first switching circuit, or between the first switching circuit and the battery pack. The controlled terminal of the second switching circuit is connected to the sixth terminal of the control circuit. The fourth terminal of the control circuit is connected to the battery pack to obtain a first voltage detection signal of the battery pack. If the first voltage detection signal and the second voltage detection signal meet the second charging condition, the control circuit sends a second conduction signal to the controlled terminal of the second switching circuit, and the second switching circuit conducts in response to the second conduction signal.

[0014] It should be noted that, in some embodiments, the second charging condition includes: the voltage value corresponding to the first voltage detection signal is less than a first preset voltage value, and the voltage value corresponding to the second voltage detection signal is less than a second preset voltage value.

[0015] It should be noted that in some embodiments, the first preset voltage value is less than the second preset voltage value.

[0016] In some embodiments, the first end of the battery pack to be charged is connected to the positive terminal of the charging interface circuit, and the second end of the battery pack to be charged is connected to the ground terminal.

[0017] In some embodiments, the current detection circuit includes: a voltage sampling unit, a first terminal of the voltage sampling unit connected to a first terminal of the sampling circuit, a second terminal of the voltage sampling unit connected to the ground terminal, a third terminal of the voltage sampling unit connected to a preset power supply, the voltage sampling unit sampling the voltage corresponding to the first terminal of the sampling circuit, and a fourth terminal of the voltage sampling unit outputting the current detection signal.

[0018] In some embodiments, the sampling circuit includes a sampling resistor, a first end of which is connected to the negative terminal of the charging interface circuit, a second end of which is connected to the ground terminal, and the current detection circuit is connected to the first end of the sampling resistor.

[0019] Secondly, this utility model provides an emergency power supply, which includes the detection circuit provided in any embodiment of this utility model.

[0020] This invention provides a detection circuit and an emergency power supply. The detection circuit is connected to the battery pack to be charged via the positive terminal of the charging interface circuit to transmit charging current to the battery pack. The negative terminal is connected to the first end of the sampling circuit to transmit current in the charging circuit.

[0021] The first terminal of the sampling circuit is connected to the negative terminal of the charging interface circuit to receive the current in the charging loop. The second terminal is connected to the ground terminal to set the reference point of the sampled current to the ground potential. The function of the sampling circuit is to sample the current in the charging loop for subsequent current detection circuitry.

[0022] The first terminal of the current detection circuit is connected to the first terminal of the sampling circuit to receive the sampled current. The second terminal is connected to the ground terminal to ensure that the reference point for current detection is consistent with the ground potential. The third terminal outputs the current detection signal. The current detection circuit generates a current detection signal by detecting the current at the first terminal of the sampling circuit and outputs it through the third terminal. This allows the detection circuit to monitor changes in the charging current in real time, thereby enabling necessary control and protection operations.

[0023] The provided detection circuit effectively avoids ground potential inconsistencies caused by two ground systems by setting the reference points of both the sampling circuit and the current detection circuit to ground potential. This design ensures the accuracy and reliability of current detection and avoids noise and interference introduced by ground potential differences. Simultaneously, because the ground potentials are kept consistent, noise and interference in the circuit are effectively suppressed. This is crucial for stable circuit operation and accurate data acquisition, especially for high-precision current detection and sensitive electronic equipment applications. The current detection circuit can monitor the charging current in real time and generate corresponding current detection signals. These signals can be further processed by the control circuit to implement functions such as charging management, overcurrent protection, and charging status monitoring, improving the safety and efficiency of the emergency power supply.

[0024] In summary, this detection circuit effectively solves the problem of inconsistent ground potentials by unifying the reference points of the charging interface circuit, sampling circuit, and current detection circuit to ground potential, reducing noise and interference, and improving the accuracy and reliability of current detection. This design not only simplifies the circuit structure but also enhances the safety and stability of the emergency power supply, making it suitable for various emergency power supplies requiring high-precision current detection.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic block diagram of the first detection circuit provided in this embodiment of the present invention;

[0028] Figure 2 This is a schematic block diagram of the second detection circuit provided in this embodiment of the present invention;

[0029] Figure 3This is a schematic block diagram of the voltage sampling unit provided in this embodiment of the utility model;

[0030] Figure 4 This is a circuit block diagram of the voltage sampling unit provided in this embodiment of the present invention;

[0031] Figure 5 This is a schematic block diagram of an emergency power supply provided by this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Emergency power supply;

[0034] 10. Detection circuit;

[0035] 11. Charging interface circuit; 12. Sampling circuit; 13. Current detection circuit; 131. Voltage sampling unit; 14. Control circuit; 15. First switching circuit; 16. Voltage detection circuit; 17. Second switching circuit;

[0036] 20. Grounding terminal;

[0037] 30. Battery pack;

[0038] 40. Preset power supply.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0041] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0042] It should be understood that 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. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should be understood that, in order to clearly describe the technical solutions of the embodiments of this utility model, the terms "first" and "second" are used in the embodiments of this utility model to distinguish identical or similar items with essentially the same function and effect. For example, the first switching circuit and the second switching circuit are only used to distinguish different switching circuits and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" do not necessarily imply that they are different.

[0044] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0045] The following provides a detailed description of some embodiments of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0046] With the rapid development and widespread adoption of emergency power supplies, charging technology is playing an increasingly important role in various devices. Efficient charging management and accurate current detection are crucial for ensuring the safe and stable operation of emergency power supplies. Traditional current detection schemes typically employ a two-ground system, where the charger ground is separated from the ground of the main control MCU and the corresponding detection circuit. While this design can meet basic current detection requirements in some cases, the two-ground system is prone to inconsistent ground potentials, introducing noise and interference.

[0047] Meanwhile, in high-speed signal transmission and high-precision current detection, differences in ground potential can severely affect detection accuracy and system stability. Furthermore, due to inconsistent ground potentials, two-ground systems exhibit poor electromagnetic compatibility (EMC) performance. External electromagnetic interference can easily be introduced into the system through the ground wire, leading to signal distortion and system malfunctions. Special attention must be paid to the separation and protection of ground wires in the circuit layout of two-ground systems, increasing the complexity of PCB design and manufacturing costs. In addition, improper ground wire layout can further exacerbate noise and interference problems.

[0048] Therefore, there is an urgent need for a detection circuit to solve the problem of inconsistent ground potential caused by current detection schemes in two-ground-wire systems, which introduces noise and interference.

[0049] Please refer to Figure 1The detection circuit 10 provided in this embodiment includes a charging interface circuit 11, a sampling circuit 12, and a current detection circuit 13. The positive terminal of the charging interface circuit 11 is connected to the battery pack 30 to be charged. The first terminal of the sampling circuit 12 is connected to the negative terminal of the charging interface circuit 11, and the second terminal of the sampling circuit 12 is connected to the ground terminal 20. The first terminal of the current detection circuit 13 is connected to the first terminal of the sampling circuit 12, and the second terminal of the current detection circuit 13 is connected to the ground terminal 20. The current detection circuit 13 detects the current corresponding to the first terminal of the sampling circuit 12 and generates a current detection signal. The third terminal of the current detection circuit 13 outputs the current detection signal.

[0050] Specifically, the detection circuit 10 is mainly used to solve the problem of inconsistent ground potential caused by the current detection scheme in the emergency power supply 100 of the traditional two-ground wire system, thereby reducing noise and interference and improving detection accuracy and reliability. In the provided detection circuit 10, the positive terminal of the charging interface circuit 11 is connected to the battery pack 30 to be charged, ensuring that the current can be smoothly transmitted to the battery pack 30. The first terminal of the sampling circuit 12 is connected to the negative terminal of the charging interface circuit 11, and the second terminal is connected to the ground terminal 20. The main function of the sampling circuit 12 is to collect the current signal during the charging process. The first terminal of the current detection circuit 13 is connected to the first terminal of the sampling circuit 12, the second terminal is connected to the ground terminal 20, and the third terminal is used to output the current detection signal. The current detection circuit 13 detects the current at the first terminal of the sampling circuit 12 and generates a corresponding current detection signal for subsequent processing and control.

[0051] For example, the operation of the detection circuit 10 may include: current flowing into the battery pack 30 from the positive terminal of the charging interface circuit 11 and flowing out from the negative terminal. The first terminal of the sampling circuit 12 is connected to the negative terminal of the charging interface circuit 11 to collect the current flowing through that point. The sampling circuit 12 converts the flowing current into a voltage signal, which is proportional to the current. The second terminal of the sampling circuit 12 is connected to the ground terminal 20 to ensure that the reference point of the sampling signal is the ground potential. The first terminal of the current detection circuit 13 is connected to the first terminal of the sampling circuit 12 to detect the sampled voltage signal. The second terminal of the current detection circuit 13 is connected to the ground terminal 20 to ensure that the reference point of the detection signal is also the ground potential. The third terminal of the current detection circuit 13 outputs a current detection signal, which can be used as follows: Figure 2 The control circuit 14 shown or other control systems read and process the data.

[0052] Assuming there is an emergency power supply 100, accurate current detection is needed during charging to ensure safety and stability. Traditional solutions use a dual-ground system, with the charger ground and the main control MCU ground being two different grounding points. This design easily leads to inconsistent ground potentials, introducing noise and interference. In this application, the charging interface circuit 11 can be an adapter, with its positive terminal connected to the positive terminal of the battery pack 30 and its negative terminal connected to the first terminal of the sampling circuit 12. The sampling circuit 12 can be a precision resistor or a current transformer. For example, using a 0.1-ohm precision resistor, a proportional voltage drop is generated when current flows through it. The first terminal of the sampling circuit 12 is connected to the negative terminal of the charging interface circuit 11, and the second terminal is connected to the ground terminal 20. The current detection circuit 13 can be an operational amplifier or an ASIC (Application-Specific Integrated Circuit). For example, an operational amplifier can be used to differentially amplify the voltage signal from the sampling circuit 12. The first terminal of the current detection circuit 13 is connected to the first terminal of the sampling circuit 12, the second terminal is connected to the ground terminal 20, and the third terminal outputs a current detection signal. The output signal can be an analog voltage signal or a digital signal, depending on the design of the detection circuit 10.

[0053] Furthermore, by unifying the reference points of the charging interface circuit 11, sampling circuit 12, and current detection circuit 13 to the ground potential, the problem of inconsistent ground potentials is effectively solved. This design ensures that the signal reference points of all circuit parts are consistent, reducing noise and interference caused by potential differences. Due to the consistent ground potential, the signal of the sampling and detection circuit 10 is more stable and reliable. Precise current detection helps to better control the charging process, avoid overcharging and over-discharging, and extend the life of the battery pack 30.

[0054] Meanwhile, a unified ground potential reduces ground potential difference, decreasing the chance of external electromagnetic interference being introduced into the circuit through the ground wire. This is particularly important for high-speed signal transmission and high-precision current detection, helping to improve the overall electromagnetic compatibility of the detection circuit 10. The provided detection circuit 10 does not require special attention to ground wire separation and protection, reducing circuit design complexity and manufacturing costs, while avoiding noise and interference problems caused by improper ground wire layout. This is of great significance for the safe and stable operation of the emergency power supply 100 equipment.

[0055] In some embodiments, such as Figure 2As shown, it also includes: a control circuit 14, the third terminal of the current detection circuit 13 is connected to the first terminal of the control circuit 14, the current detection signal is input to the control circuit 14 through the third terminal of the current detection circuit 13, and the second terminal of the control circuit 14 is connected to the ground terminal 20; a first switch circuit 15, the first switch circuit 15 is connected between the positive terminal of the charging interface circuit 11 and the battery pack 30; wherein, the third terminal of the control circuit 14 is connected to the controlled terminal of the switch circuit, if the current detection signal meets the first charging condition, the control circuit 14 sends a first conduction signal to the controlled terminal of the first switch circuit 15, the first switch circuit 15 responds to the first conduction signal and conducts, and the battery pack 30 enters the charging state.

[0056] The current detection signal is input to the control circuit 14 through the third terminal of the current detection circuit 13 connected to the first terminal of the control circuit 14. The second terminal of the control circuit 14 is connected to the ground terminal 20 to ensure that the reference point of the control signal is also at the ground potential. The control circuit 14 receives the current detection signal and makes a judgment based on the preset charging conditions. If the current detection signal meets the first charging condition, the control circuit 14 sends a first conduction signal to the controlled terminal of the first switching circuit 15, such as sending a high-level signal as the first conduction signal.

[0057] It should be noted that the control circuit 14 can be a microcontroller unit (MCU) or a battery management system (BMS), and this application embodiment does not limit it in this way.

[0058] The first switching circuit 15 is connected between the positive terminal of the charging interface circuit 11 and the battery pack 30. The controlled terminal of the first switching circuit 15 is connected to the third terminal of the control circuit 14 and receives the first conduction signal sent by the control circuit 14. When the first switching circuit 15 receives the first conduction signal, the first switching circuit 15 conducts, causing the battery pack 30 to enter the charging state. If the current detection signal does not meet the first charging condition, the control circuit 14 does not send the first conduction signal or sends a shutdown signal (such as a low-level signal), the first switching circuit 15 remains in the off state, and the battery pack 30 does not charge.

[0059] For example, the first charging condition includes the detection current value corresponding to the current detection signal being less than a first preset current value. The first preset current value can be set according to the specific safe charging current of the battery pack 30 or other related requirements, such as the first preset current value being 10A. This application embodiment does not limit the specific value of the first preset current value.

[0060] For example, such as Figure 2As shown, the fourth terminal of the control circuit 14 is connected to the battery pack 30. After the control circuit 14 is successfully connected to the battery pack 30, it obtains the first voltage detection signal corresponding to the battery pack 30 through the fourth terminal. When the switching circuit responds to the first conduction signal and turns on, if the battery pack 30's voltage and current detection signals meet the conditions for stopping charging, the control circuit 14 sends a first shutdown signal to the controlled terminal of the first switching circuit 15. The first switching circuit 15 responds to the first shutdown signal and turns off, and the battery pack 30 stops charging.

[0061] After successfully connecting to the battery pack 30, the control circuit 14 acquires the first voltage detection signal corresponding to the battery pack 30 through its fourth terminal. The current detection circuit 13 detects the current corresponding to the first terminal of the sampling circuit 12 and generates a current detection signal, which is output to the control circuit 14 through its third terminal. When the first switch circuit 15 turns on in response to the first conduction signal, the control circuit 14 simultaneously monitors the current detection signal and the first voltage detection signal. If both meet the conditions for stopping charging, the control circuit 14 sends a first shutdown signal to the controlled terminal of the first switch circuit 15, causing the first switch circuit 15 to open and the battery pack 30 to stop charging.

[0062] Furthermore, the control circuit 14 makes judgments not only based on the current detection signal but also on the voltage detection signal of the battery pack 30. This multi-condition judgment mechanism is more intelligent and can control the charging process more accurately. During charging, the control circuit 14 can dynamically adjust the charging state according to the real-time changes in charging current and battery pack 30 voltage to ensure that the battery pack 30 is charged within a safe range. Through precise current and voltage detection, it can ensure that the battery pack 30 is charged in the optimal state, avoiding overcharging and over-discharging, thereby extending the battery's lifespan.

[0063] It should be noted that, in some embodiments, the charging stop conditions include the detection current value corresponding to the current detection signal being less than the second preset current value, and the detection voltage value corresponding to the first voltage detection signal being not less than the first preset voltage value.

[0064] The second preset current value and the first preset voltage value are thresholds set according to the characteristics of the battery pack 30 and the charging strategy. For example, the second preset current value is 0.5A and the first preset voltage value is 28.8V. In this embodiment, the specific values ​​of the second preset current value and the first preset voltage value are not limited.

[0065] By setting a first preset voltage value, when the voltage of the battery pack 30 reaches or exceeds this value, the control circuit 14 will immediately send a shutdown signal to ensure that the battery pack 30 is not overcharged. Overcharge protection can prevent uncontrolled chemical reactions inside the battery pack 30, avoiding battery damage or danger. By setting a second preset current value, when the charging current drops below this value, the control circuit 14 will stop charging. This helps prevent battery overheating and shortened lifespan caused by prolonged low-current charging. Stopping charging when the battery pack 30 is close to full charge optimizes the charging process and reduces unnecessary charging time. The provided detection circuit 10, by combining the current detection circuit 13 and the voltage detection circuit 16, achieves dual protection of current and voltage detection, ensuring the reliability of the charging process and reducing malfunctions caused by single-condition judgment.

[0066] For example, such as Figure 2 As shown, it also includes: a voltage detection circuit 16, the first end of which is connected to the positive terminal of the charging interface circuit 11, the second end of which is connected to the ground terminal 20, and the fifth end of the control circuit 14. The voltage detection circuit 16 detects the voltage corresponding to the positive terminal of the charging interface circuit 11 and outputs a second voltage detection signal to the fifth end of the control circuit 14; a second switch circuit 17, which is connected between the positive terminal of the charging interface circuit 11 and the first switch circuit 15, or between the first switch circuit 15 and the battery pack 30. The controlled end of the second switch circuit 17 is connected to the sixth end of the control circuit 14. The fourth end of the control circuit 14 is connected to the battery pack 30 to obtain the first voltage detection signal of the battery pack 30. If the first voltage detection signal and the second voltage detection signal meet the second charging condition, the control circuit 14 sends a second conduction signal to the controlled end of the second switch circuit 17, and the second switch circuit 17 conducts in response to the second conduction signal.

[0067] By adding a voltage detection circuit 16 and a second switching circuit 17, the control circuit 14 can more comprehensively monitor the voltage input to the charging interface circuit 11 and the voltage of the battery pack 30 itself during the charging process. The second switching circuit 17 will only be allowed to conduct when the second charging condition is met, thus preventing battery damage or equipment malfunction due to abnormal voltage.

[0068] at the same time, Figure 2 The current detection circuit 13 and voltage detection circuit 16 can be used together to enable the control circuit 14 to more accurately determine the charging conditions, ensure that the battery pack 30 is charged in the best condition, and extend the battery life.

[0069] It should be noted that, in some embodiments, the second charging condition includes: the voltage value corresponding to the first voltage detection signal is less than the first preset voltage value, and the voltage value corresponding to the second voltage detection signal is less than the second preset voltage value.

[0070] The first preset voltage value and the second preset voltage value are thresholds set according to the characteristics of the battery pack 30 and the charging strategy. For example, the second preset voltage value is 31V and the first preset voltage value is 28.8V. In this embodiment, the specific values ​​of the first preset voltage value and the second preset voltage value are not limited.

[0071] By setting a first preset voltage value, when the voltage of the battery pack 30 reaches or exceeds this value, the control circuit 14 will immediately send a shutdown signal to ensure that the battery pack 30 is not overcharged. By setting a second preset voltage value, when the charging voltage reaches or exceeds this value, the control circuit 14 will stop charging. This helps prevent the battery from burning out due to excessively high charging voltage. Overcharge protection can prevent uncontrolled chemical reactions inside the battery pack 30, avoiding battery damage or danger. Stopping charging when the battery pack 30 is close to being fully charged optimizes the charging process and reduces unnecessary charging time. Furthermore, the provided detection circuit 10 ensures the reliability of the charging process through a voltage detection protection mechanism.

[0072] It should be noted that in some embodiments, the first preset voltage value is less than the second preset voltage value.

[0073] Based on the aforementioned second charging conditions, the first preset voltage value corresponds to the upper limit of the battery pack 30's voltage, and the second preset voltage value corresponds to the upper limit of the charging voltage input to the charging interface circuit 11. If the first preset voltage value is less than the second preset voltage value, overcharging caused by the battery pack 30's voltage exceeding the charging voltage can be effectively avoided. Overcharging may lead to increased internal battery pressure, electrolyte decomposition, and even thermal runaway, causing serious safety accidents such as fires or explosions. Overcharging also shortens battery lifespan and reduces battery reliability and stability. Under overcharge conditions, the battery's internal chemical reactions may become unbalanced, leading to a gradual decrease in battery capacity. Prolonged overcharging will significantly shorten battery lifespan.

[0074] In some embodiments, the first end of the battery pack 30 to be charged is connected to the positive terminal of the charging interface circuit 11, and the second end of the battery pack 30 to be charged is connected to the ground terminal 20.

[0075] like Figure 2As shown, by connecting the second end of the battery pack 30 to the grounding terminal 20, the sampling circuit 12, current detection circuit 13, control circuit 14 and the reference point of the battery pack 30 in the provided detection circuit 10 are all at the same grounding terminal 20. This effectively solves the problem of inconsistent ground potential, reduces noise and interference, and improves the accuracy and reliability of current detection in the detection circuit 10.

[0076] In some embodiments, such as Figure 3 As shown, the current detection circuit 13 includes: a voltage sampling unit 131, the first end of the voltage sampling unit 131 is connected to the first end of the sampling circuit 12, the second end of the voltage sampling unit 131 is connected to the ground terminal 20, the third end of the voltage sampling unit 131 is connected to the preset power supply 40, the voltage sampling unit 131 samples the voltage corresponding to the first end of the sampling circuit 12, and the fourth end of the voltage sampling unit 131 outputs a current detection signal.

[0077] By directly sampling the voltage at the first terminal of the sampling circuit 12 through the voltage sampling unit 131, the charging current can be reflected more accurately. Direct sampling by the voltage sampling unit 131 reduces errors in signal transmission, resulting in more accurate current detection. Furthermore, the voltage sampling unit 131 can provide real-time voltage data, which the control circuit 14 uses to dynamically adjust the charging current and voltage, making the charging process more efficient. Precise voltage sampling data helps optimize the charging algorithm, ensuring the battery pack 30 remains in optimal condition during charging and reducing unnecessary energy waste.

[0078] By introducing a voltage sampling unit 131 to directly sample the voltage at the first terminal of the sampling circuit 12, the accuracy and reliability of current detection are improved, the circuit design is simplified, and the system's anti-interference capability and safety are enhanced. This improvement can significantly improve the performance of the charging system in practical applications.

[0079] For example, such as Figure 4As shown, the voltage detection unit includes a first resistor R1, a second resistor R2, and a capacitor C1. One end of the first resistor R1 is connected to the first terminal of the voltage detection unit, and the other end of the first resistor R1 is connected to the third terminal of the voltage detection unit. One end of the second resistor R2 is connected to the fourth terminal of the voltage detection unit, and the other end of the second resistor R2 is connected to the third terminal of the voltage detection unit. One end of the capacitor C1 is connected to the third terminal of the voltage detection unit, and the other end of the capacitor C1 is connected to the ground terminal 20. Furthermore, by setting the resistance values ​​of the first resistor R1, the second resistor R2, the capacitor C1, and the preset power supply voltage of the power supply 40, a correspondence can be established between the voltage value at the third terminal of the voltage detection unit and the current value at the first terminal of the sampling circuit 12. This allows for the rapid generation of a corresponding current detection signal based on the voltage value at the third terminal of the voltage detection unit, thereby quickly determining the magnitude of the charging current according to the aforementioned correspondence.

[0080] It should be noted that the correspondence between the resistance values ​​of the first resistor R1, the second resistor R2, the capacitance value of the capacitor C1, the power supply voltage value of the preset power supply 40, the voltage value of the third terminal of the voltage detection unit, and the current value of the first terminal of the sampling circuit 12 can all be set and adjusted according to actual needs, and this application embodiment does not impose any restrictions on this.

[0081] In some embodiments, the sampling circuit 12 includes a sampling resistor, the first end of which is connected to the negative terminal of the charging interface circuit 11, the second end of which is connected to the ground terminal 20, and the current detection circuit 13 is connected to the first end of the sampling resistor.

[0082] like Figure 4 As shown, the sampling resistor can be Figure 4 The resistor R3 is used in the current sensing circuit. The use of a sampling resistor is a classic and reliable method for current sensing, accurately measuring the current flowing through the resistor. The current sensing signal is linearly related to the current, facilitating subsequent signal processing and analysis. By using a sampling resistor, the structure of the current sensing circuit 13 is simpler, easier to implement and debug. Simultaneously, the voltage drop generated by the sampling resistor is typically very stable with low noise, contributing to improved overall system stability. Furthermore, the value of resistor R3 can be designed in conjunction with the parameters of other circuit components in the overall sensing circuit 10; this embodiment does not impose such limitations.

[0083] In some embodiments, combined with Figure 2When the charging interface circuit 11 operates within a charging power range of 60W to 300W, the first preset current value corresponding to the first charging condition is 10A. The second preset current value corresponding to the charging stop condition is 0.5A. The first preset voltage value corresponding to the second charging condition is 28.8V, and the second preset voltage value is 31V. Based on these parameters, in the provided detection circuit 10, when the control circuit 14 detects that the input charging voltage is less than 31V and the battery pack 30 voltage is 28.8V, the control circuit 14 controls the first switch circuit 15 and the second switch circuit 17 to conduct. The battery pack 30 is continuously charged while the charging current is detected to be less than 10A until the control circuit 14 detects that the charging current is less than 0.5A and the battery pack 30 voltage reaches 28.8V, at which point charging stops, and the first switch circuit 15 and the second switch circuit 17 are disconnected.

[0084] Please see Figure 5 This utility model provides an emergency power supply 100, including a detection circuit 10 provided in any embodiment of this application. The detection circuit 10 may include a charging interface circuit 11, a sampling circuit 12, and a current detection circuit 13. The positive terminal of the charging interface circuit 11 is connected to the battery pack 30 to be charged. The first terminal of the sampling circuit 12 is connected to the negative terminal of the charging interface circuit 11, and the second terminal of the sampling circuit 12 is connected to the ground terminal 20. The first terminal of the current detection circuit 13 is connected to the first terminal of the sampling circuit 12, and the second terminal of the current detection circuit 13 is connected to the ground terminal 20. The current detection circuit 13 detects the current corresponding to the first terminal of the sampling circuit 12 and generates a current detection signal. The third terminal of the current detection circuit 13 outputs the current detection signal.

[0085] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0086] The foregoing disclosure provides many different embodiments or examples for implementing various structures of this utility model. To simplify the disclosure, specific examples of components and arrangements are described above. These are merely examples and are not intended to limit the scope of the utility model. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this utility model; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A detection circuit, characterized in that, include: A charging interface circuit, wherein the positive terminal of the charging interface circuit is connected to the battery pack to be charged; A sampling circuit, wherein the first terminal of the sampling circuit is connected to the negative terminal of the charging interface circuit, and the second terminal of the sampling circuit is connected to the ground terminal; A current detection circuit is provided, wherein a first terminal of the current detection circuit is connected to a first terminal of the sampling circuit, a second terminal of the current detection circuit is connected to a ground terminal, the current detection circuit detects the current corresponding to the first terminal of the sampling circuit and generates a current detection signal, and a third terminal of the current detection circuit outputs the current detection signal.

2. The detection circuit according to claim 1, characterized in that, Also includes: The control circuit has a third terminal connected to the first terminal of the control circuit, and the current detection signal is input to the control circuit through the third terminal of the current detection circuit. The second terminal of the control circuit is connected to the ground terminal. A first switching circuit is connected between the positive terminal of the charging interface circuit and the battery pack. The third terminal of the control circuit is connected to the controlled terminal of the switching circuit. If the current detection signal meets the first charging condition, the control circuit sends a first conduction signal to the controlled terminal of the first switching circuit. The first switching circuit responds to the first conduction signal and conducts, and the battery pack enters the charging state.

3. The detection circuit according to claim 2, characterized in that, The first charging condition includes the detection current value corresponding to the current detection signal being less than a first preset current value.

4. The detection circuit according to claim 2, characterized in that, The fourth terminal of the control circuit is connected to the battery pack. After the control circuit is successfully connected to the battery pack, it obtains the first voltage detection signal corresponding to the battery pack through the fourth terminal. When the switching circuit turns on in response to the first conduction signal, if the battery pack current and the current detection signal meet the conditions for stopping charging, the control circuit sends a first shutdown signal to the controlled terminal of the first switching circuit. The first switching circuit then disconnects in response to the first shutdown signal, and the battery pack stops charging.

5. The detection circuit according to claim 4, characterized in that, The charging stop conditions include the current value corresponding to the current detection signal being less than the second preset current value, and the voltage value corresponding to the first voltage detection signal being not less than the first preset voltage value.

6. The detection circuit according to claim 2, characterized in that, Also includes: A voltage detection circuit is provided, wherein the first terminal of the voltage detection circuit is connected to the positive terminal of the charging interface circuit, the second terminal of the voltage detection circuit is connected to the ground terminal, and the fifth terminal of the control circuit is connected to the voltage corresponding to the positive terminal of the charging interface circuit. The voltage detection circuit detects the voltage corresponding to the positive terminal of the charging interface circuit and outputs a second voltage detection signal to the fifth terminal of the control circuit. A second switching circuit is connected between the positive terminal of the charging interface circuit and the first switching circuit, or the second switching circuit is connected between the first switching circuit and the battery pack, and the controlled terminal of the second switching circuit is connected to the sixth terminal of the control circuit. The fourth terminal of the control circuit is connected to the battery pack to obtain the first voltage detection signal of the battery pack. If the first voltage detection signal and the second voltage detection signal meet the second charging condition, the control circuit sends a second conduction signal to the controlled terminal of the second switching circuit, and the second switching circuit responds to the second conduction signal to conduct.

7. The detection circuit according to claim 6, characterized in that, The second charging condition includes: the voltage value corresponding to the first voltage detection signal is less than the first preset voltage value, and the voltage value corresponding to the second voltage detection signal is less than the second preset voltage value.

8. The detection circuit according to claim 7, characterized in that, The first preset voltage value is less than the second preset voltage value.

9. The detection circuit according to claim 1, characterized in that, The first end of the battery pack to be charged is connected to the positive terminal of the charging interface circuit, and the second end of the battery pack to be charged is connected to the ground terminal.

10. The detection circuit according to claim 1, characterized in that, The current detection circuit includes: A voltage sampling unit is provided, wherein a first terminal of the voltage sampling unit is connected to a first terminal of the sampling circuit, a second terminal of the voltage sampling unit is connected to a ground terminal, a third terminal of the voltage sampling unit is connected to a preset power supply, the voltage sampling unit samples the voltage corresponding to the first terminal of the sampling circuit, and a fourth terminal of the voltage sampling unit outputs the current detection signal.

11. The detection circuit according to claim 1, characterized in that, The sampling circuit includes a sampling resistor, the first end of which is connected to the negative terminal of the charging interface circuit, the second end of which is connected to the ground terminal, and the current detection circuit is connected to the first end of the sampling resistor.

12. An emergency power supply, characterized in that, The emergency power supply includes the detection circuit according to any one of claims 1-11.

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