Dry lithium battery power supply control system

Abstract

The utility model relates to the technical field of dry lithium battery power supply management, in particular to a dry lithium battery power supply control system. A dry battery; a load; the output control circuit is used for controlling the connection / disconnection between the lithium battery and the load and controlling the connection / disconnection between the dry battery and the load; the electric quantity detection circuit is used for detecting the electric quantity of the lithium battery and the dry battery and outputting a voltage signal; and the single-chip microcomputer is used for detecting according to the voltage signal, and controlling the battery switching circuit to disconnect the access between the lithium battery and the load and connect the access between the dry battery and the load when the voltage of the lithium battery is lower than a preset voltage. Based on the application, when power supply control is realized, the lithium battery can be firstly used as a main power supply, the lithium battery is preferentially used, so that the dry battery is used as a standby power supply, and the dry battery is started through the control of the single chip microcomputer when the electric quantity of the lithium battery is insufficient in a low-temperature environment, so that a load system can work in more severe environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of dry lithium battery power supply management especially relates to a dry lithium battery power supply control system. BACKGROUND

[0002] At present, most of the infrared cameras use dry batteries for power supply, but the cost of dry batteries is high and is not conducive to environmental protection. With the popularization of lithium batteries and solar technology, infrared cameras also begin to use lithium batteries and solar charging technology, making the infrared camera more environmentally friendly and increasing the use time when used outdoors, without frequent replacement of dry batteries.

[0003] However, lithium batteries are sensitive to temperature, and the power consumption is very fast at low temperature; and solar energy cannot charge lithium batteries in rainy weather, plus lithium batteries are generally built-in and cannot be conveniently replaced, which easily leads to low battery of the machine and the machine cannot work. Dry batteries are more friendly to low-temperature use environment, and are easy to replace, so there is a product demand for dry batteries plus lithium batteries plus solar charging to meet the harsh outdoor use environment. Use solar energy and lithium battery power supply at normal temperature and in sufficient sunlight, and continue to use dry battery power supply in low temperature and rainy weather, which can make the infrared camera work continuously for a long time in a more severe environment.

[0004] Currently, there is no mature switching circuit system for the dry lithium battery mixed use scheme of the infrared camera. On the market, dry batteries and lithium batteries are two separate power supply schemes that do not interfere with each other. This results in that dry battery power supply and lithium battery power supply cannot be linked, and the system cannot control the switch of the two power supply circuits. Only passive power supply is available. Because the dry battery voltage is high (4 strings of 6V), the dry battery power supply is used first; and the lithium battery voltage is low (1 string of 3.7V), that is, the lithium battery power supply is used later. In this way, the dry battery is used as the main battery, and the lithium battery is used as the backup battery. Although the use time of the infrared camera is extended, when the dry battery needs to be used in a low temperature environment, the dry battery power has been depleted. The unified control of dry lithium battery is not reasonable. SUMMARY

[0005] One purpose of the embodiments of the present application is to provide a dry lithium battery power supply control system to solve the technical problems that the control system for dry lithium battery mixed use is not mature enough and the control of dry lithium battery is not reasonable enough in related technologies.

[0006] The embodiments of the present application provide a dry lithium battery power supply control system, which comprises:

[0007] lithium battery;

[0008] dry battery;

[0009] load;

[0010] an output control circuit, a first input end of the output control circuit is connected with an output end of the lithium battery, a second input end of the output control circuit is connected with an output end of the dry battery, and an output end of the output control circuit is connected with an input end of the load; the output control circuit is used for controlling connection on / off between the lithium battery and the load and connection on / off between the dry battery and the load;

[0011] a power detection circuit, the power detection circuit is connected with the output end of the lithium battery and the output end of the dry battery respectively, and is used for detecting battery power of the lithium battery and the dry battery and outputting a voltage signal;

[0012] a single-chip microcomputer, an input pin of the single-chip microcomputer is connected with an output end of the power detection circuit, an output pin of the single-chip microcomputer is connected with a controlled end of the output control circuit, and the single-chip microcomputer is used for detecting according to the voltage signal, controlling the battery switching circuit to disconnect a path between the lithium battery and the load and turn on a path between the dry battery and the load when a voltage of the lithium battery is lower than a preset voltage.

[0013] Optionally, the dry lithium battery power supply control system further comprises:

[0014] a first switch circuit, the first switch circuit is electrically connected with the single-chip microcomputer, the dry battery and the load respectively, and is used for turning on the path between the dry battery and the load when a battery switching signal is received;

[0015] a second switch circuit, the second switch circuit is electrically connected with the single-chip microcomputer, the lithium battery and the load respectively, and is used for disconnecting the path between the dry battery and the load when the battery switching signal is received.

[0016] Optionally, the first switch circuit comprises a first NMOS tube, a first PMOS tube and a second PMOS tube, an input end of the first NMOS tube is connected with an output pin of the single-chip microcomputer, and output ends of the first NMOS tube, the first PMOS tube and the second PMOS tube are connected respectively.

[0017] Optionally, the second switch circuit comprises a second NMOS tube, a third PMOS tube and a fourth PMOS tube, an input end of the second NMOS tube is connected with an output pin of the single-chip microcomputer, and output ends of the second NMOS tube, the third PMOS tube and the fourth PMOS tube are connected respectively.

[0018] Optionally, the first PMOS tube and the second PMOS tube are connected back-to-back, and the third PMOS tube and the fourth PMOS tube are connected back-to-back.

[0019] Optionally, the dry lithium battery control system further comprises:

[0020] a lithium battery charging circuit, an output end of the lithium battery charging circuit being electrically connected with an input end of the lithium battery, for charging the lithium battery;

[0021] a solar cell panel, an output end of the solar cell panel being electrically connected with a first input end of the lithium battery circuit, for converting external solar energy into electric energy to charge the lithium battery through the lithium battery charging circuit.

[0022] Optionally, the dry lithium battery control system further comprises:

[0023] a USB input interface, the USB input interface being connected with external voltage, for receiving external voltage;

[0024] a USB output interface, the USB output interface being electrically connected with a second input end of the lithium battery charging circuit, for charging the lithium battery through the lithium battery charging circuit.

[0025] Optionally, the dry lithium battery control system further comprises:

[0026] a charging current control circuit, input ends of the charging current control circuit being electrically connected with the USB output interface and the load respectively, a plurality of diodes and transistors being arranged in the charging current control circuit, to adjust the size of the charging current according to the working state of the load.

[0027] Optionally, the power detection circuit comprises:

[0028] a dry battery detection circuit;

[0029] an input end of the dry battery detection circuit being electrically connected with an output end of the dry battery, an output end of the battery detection circuit being connected with an input pin of the single-chip microcomputer, for detecting whether the dry battery is inserted and transmitting a level signal to the input pin of the single-chip microcomputer.

[0030] The embodiments of the present application can achieve the following technical effects:

[0031] The embodiment of the present application provides a dry lithium battery control system, which comprises a lithium battery, a dry battery, a load and an output control circuit, a first input end of the output control circuit is connected with an output end of the lithium battery, a second input end of the output control circuit is connected with an output end of the dry battery, and an output end of the output control circuit is connected with an input end of the load; the output control circuit is used for controlling the connection on / off between the lithium battery and the load and the connection on / off between the dry battery and the load; a power detection circuit is connected with the output end of the lithium battery and the output end of the dry battery respectively, and is used for detecting the battery power of the lithium battery and the dry battery and outputting a voltage signal; an input pin of a single-chip microcomputer is connected with the output end of the power detection circuit, and an output pin of the single-chip microcomputer is connected with a controlled end of the output control circuit; the single-chip microcomputer is used for detecting according to the voltage signal, controlling the battery switching circuit to disconnect the path between the lithium battery and the load and turn on the path between the dry battery and the load when the voltage of the lithium battery is lower than a preset voltage.

[0032] Based on the system, when power supply control is realized, the lithium battery is used as a main power supply, the lithium battery is preferentially used, the dry battery is used as a backup power supply, the dry battery is started by the control of the single-chip microcomputer when the lithium battery power is insufficient in a low-temperature environment, so that the load system can work in more severe environments, and the embarrassing situation that the load cannot be powered when the lithium battery is low in a low-temperature environment is solved, the power supply is systematically deployed and used, and seamless switching of power supply is realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0034] Figure 1 A schematic diagram of a dry lithium battery power supply control system provided by the embodiment of the present application;

[0035] Figure 2 A circuit principle schematic diagram of an output control circuit provided by the embodiment of the present application;

[0036] Figure 3 A circuit principle schematic diagram of another output control circuit provided by the embodiment of the present application;

[0037] Figure 4 A circuit principle schematic diagram of a dry battery detection circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly. In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features.

[0040] In addition, "and / or" appearing throughout the text means that three parallel solutions are included, taking "A and / or B" as an example, including A solution, or B solution, or A and B solutions that meet at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0041] It is easy to understand that the dual-battery power supply scheme in the related art can only supply power to the load through two separate paths, that is, the high-voltage power is used up first and then the low-voltage power is used, which cannot intelligently select the output energy according to the use environment and power characteristics, thereby leading to waste of power and also limiting the scene and range of load adaptation. For example, if the dry battery has power, the dry battery can only be used up before the lithium battery power is used, which leads to the dilemma of not being environmentally friendly and not being able to guarantee the fast consumption of lithium batteries in low-temperature environments without dry batteries. At the same time, it also cannot seamlessly switch to the lithium battery after the dry battery is used up, which causes the disadvantages of load related machine or restart. In addition, the related art often uses diodes to isolate dry lithium batteries, thereby causing voltage drop loss on the power supply path.

[0042] Therefore, the present application provides a dry lithium battery power supply control system, with reference to Figure 1 , the system comprises:

[0043] lithium battery 10;

[0044] dry battery 20;

[0045] load 60;

[0046] output control circuit 30, a first input end of the output control circuit is connected with an output end of the lithium battery, a second input end of the output control circuit is connected with an output end of the dry battery, and an output end of the output control circuit is connected with an input end of the load; the output control circuit is used for controlling the connection on / off between the lithium battery and the load and the connection on / off between the dry battery and the load;

[0047] power detection circuit 40, the power detection circuit is connected with the output end of the lithium battery and the output end of the dry battery respectively, and is used for detecting the battery power of the lithium battery and the dry battery and outputting a voltage signal;

[0048] single-chip microcomputer 50, an input pin of the single-chip microcomputer is connected with an output end of the power detection circuit, and an output pin of the single-chip microcomputer is connected with a controlled end of the output control circuit; the single-chip microcomputer is used for detecting according to the voltage signal, controlling the battery switching circuit to disconnect the passageway between the lithium battery and the load and to turn on the passageway between the dry battery and the load when the voltage of the lithium battery is lower than a preset voltage.

[0049] It can be understood that most of the existing infrared cameras are powered by a single lithium battery 10, and when the lithium battery 10 is about to run out of power, the infrared camera needs to be charged in time to maintain the normal work of the infrared camera. However, since the infrared camera is usually widely used in outdoor places, the user often cannot find a power source in time to charge the infrared camera, resulting in that the infrared camera cannot be used.

[0050] In order to solve the above problems, the utility model discloses two kinds of batteries are arranged in infrared camera, respectively lithium battery 10 and dry battery 20, when the electric quantity of lithium battery 10 is about to be exhausted, through control battery switching circuit 30, infrared camera is switched from lithium battery 10 power supply mode to dry battery 20 power supply mode, to improve the endurance of infrared camera. In addition, before switching the power supply mode, it is necessary to determine whether the current lithium battery 10 reaches the condition of unable normal power supply. The utility model discloses through the voltage of lithium battery 10 in real time detection voltage detection circuit 40 to singlechip 50 with the voltage signal output of detected voltage, to make singlechip 50 according to voltage signal detection voltage value of lithium battery 10. It needs to understand, the standard voltage of lithium battery 10 output is 3.7V, and the voltage of lithium battery 10 output is as low as 3.3V and can be considered that the electric quantity is about to be exhausted, and the voltage of lithium battery 10 output cannot be below 3.3V, otherwise will damage the battery. The utility model sets up singlechip 50 according to voltage signal detection lithium battery 10 less than 3.3V voltage, considers that the electric quantity of lithium battery 10 is about to be exhausted, and controls output control circuit 30 to start work, to switch infrared camera from lithium battery 10 power supply mode to dry battery 20 power supply mode, to make dry battery 20 replace lithium battery 10 and continue to provide working voltage for infrared camera, to increase the use time of infrared camera.

[0051] In practical application, the electric quantity detection circuit 20 can be realized by a resistance voltage dividing circuit. The resistance voltage dividing circuit includes a first resistor and a second resistor. The voltage of the lithium battery 10 is divided according to the resistance ratio of the first resistor and the second resistor, and the divided voltage is sent to the single-chip microcomputer 50 in the form of a voltage detection signal. The single-chip microcomputer 50 obtains the voltage value after voltage division according to the voltage detection signal, and detects the current voltage value of the lithium battery 10 according to the preset resistance ratio. When the single-chip microcomputer 50 detects that the current voltage value of the lithium battery 10 is lower than 3.3V, it is determined that the electric quantity of the lithium battery 10 is about to be exhausted. That is, the output control circuit 30 switches the infrared camera from the lithium battery 10 power supply mode to the dry battery 20 power supply mode, that is, the path between the lithium battery 10 and the load 60 is disconnected, so that the lithium battery 10 stops providing working voltage for the load 60. At the same time, the path between the dry battery 20 and the infrared camera is turned on, so that the dry battery 20 replaces the lithium battery 10 to provide working voltage for the load. In addition, when the electric quantity of the lithium battery 10 and the dry battery 20 is about to be exhausted, the user can manually replace a new dry battery to continue to provide working voltage for the load, thereby increasing the use time of the load.

[0052] In an embodiment, the dry lithium battery power supply control system further comprises:

[0053] The first switch circuit is electrically connected with the single-chip microcomputer, the dry battery, and the load, respectively, and is used for turning on the path between the dry battery and the load when receiving the battery switching signal.

[0054] The second switch circuit is electrically connected to the single chip microcomputer, the lithium battery and the load respectively, and is used to disconnect the path between the dry cell and the load when receiving a battery switching signal.

[0055] As a feasible implementation manner, the above-mentioned first switching circuit includes a first NMOS tube, a first PMOS tube and a second PMOS tube, the input end of the first NMOS tube is connected to the output pin of the microcontroller, and the output end of the first NMOS tube is respectively connected to the output ends of the first PMOS tube and the second PMOS tube.

[0056] As a feasible implementation manner, the above-mentioned second switching circuit includes a second NMOS tube, a third PMOS tube and a fourth PMOS tube, the input end of the second NMOS tube is connected to the output pin of the microcontroller, and the output end of the second NMOS tube is respectively connected to the output ends of the third PMOS tube and the fourth PMOS tube.

[0057] In this embodiment, when both the dry cell battery and the lithium battery are charged, the main lithium battery is preferentially used to supply power to the load.

[0058] Please refer to Figure 2 ,like Figure 2 The output control circuit shown in the figure prioritizes the main lithium battery to power the load when both the dry cell and lithium battery are charged. Specifically, the microcontroller enables AA_EN at a high level, turning on NMOS transistor Q12 (the first NMOS transistor mentioned above). Turning on Q12 turns off NMOS transistors Q11 and Q13, which in turn turns off PMOS transistors Q9 (the first PMOS transistor mentioned above) and Q10 (the first PMOS transistor mentioned above), thereby disconnecting the dry cell output path.

[0059] Accordingly, please refer to Figure 3 ,like Figure 3 In the output control circuit shown, the microcontroller enables LI_EN at a low level to control the NMOS Q7 to be turned off. Q7 (i.e., the second NMOS tube mentioned above) is turned off and the NMOS Q6 and Q8 are turned on. After Q6 and Q8 are turned on, the PMOS Q2 (i.e., the third PMOS tube mentioned above) and Q3 (i.e., the fourth PMOS tube mentioned above) are turned on, thereby opening the output path of the lithium battery.

[0060] When the lithium battery is low and the dry cells are full of power, the backup dry cells are used to power the load.

[0061] Specifically, the microcontroller enables LI_EN high level to control the conduction of Q7 of NMOS, and after Q12 is turned on, Q6 and Q8 of NMOS are turned off, and then Q2 and Q3 of PMOS are turned off, thereby disconnecting the output path of the lithium battery.

[0062] The single-chip microcomputer enables the AA_EN low level to control the Q12 of the NMOS to be off. After the Q12 is off, the Q11 and Q13 of the NMOS are turned on, and the Q9 and Q10 of the PMOS are turned on after the Q11 and Q13 are turned on, so as to open the output path of the dry battery to supply power to the load.

[0063] Since the Q2 and Q3 on the lithium battery path and the Q9 and Q10 on the dry battery path are all PMOS, the conduction resistance is only tens of milliohms; therefore, the path loss is extremely small and can be ignored.

[0064] In an embodiment, the first PMOS and the second PMOS are connected back-to-back, and the third PMOS and the fourth PMOS are connected back-to-back.

[0065] As described above Figure 2 , Figure 3 , wherein the two groups of PMOS, Q2, Q3 and Q9, Q10, are connected back-to-back. When turned off, the mutual conduction phenomenon can be avoided due to the different voltages of the dry battery and the lithium battery.

[0066] In an embodiment, as described above Figure 1 , the dry lithium battery control system further comprises:

[0067] a lithium battery charging circuit, an output end of the lithium battery charging circuit being electrically connected with an input end of the lithium battery, for charging the lithium battery;

[0068] a solar panel, an output end of the solar panel being electrically connected with a first input end of the lithium battery circuit, for converting external solar energy into electric energy to charge the lithium battery through the lithium battery charging circuit.

[0069] Further, as described above Figure 1 , the dry lithium battery control system further comprises:

[0070] a USB input interface, the USB input interface being connected with an external voltage, for receiving the external voltage;

[0071] a USB output interface, the USB output interface being electrically connected with a second input end of the lithium battery charging circuit, for charging the lithium battery through the lithium battery charging circuit.

[0072] Still further, the dry lithium battery control system further comprises:

[0073] A charging current control circuit, wherein the input end of the charging current control circuit is electrically connected to the USB output interface and the load respectively, and the charging current control circuit is provided with a plurality of diodes and transistors to adjust the magnitude of the charging current according to the working state of the load.

[0074] When USB and solar energy are connected at the same time, USB charging is used first and the system is powered on. The microcontroller detects the level status of U2's 7th pin to determine whether U2 is charging the lithium battery.

[0075] When USB input is received, the device detects whether it is powered on. If so, the charging current is adjusted to a low current of 200mA via D10, Q17, and Q16 in the charging current control circuit to charge the lithium battery, while the remaining current is supplied to the system. If the system is powered off or in sleep mode, the charging current is adjusted to a high current of 800mA via D19 and Q16 in the charging current control circuit to charge the lithium battery. Simultaneously, Q3 is turned off via D3, disconnecting the lithium battery from the load.

[0076] When solar energy is connected alone, the charging IC charges the lithium battery with a small current of no more than 200mA.

[0077] For further information, please refer to Figure 4 , Figure 4 The figure shows a dry cell battery detection circuit, wherein the input end of the dry cell battery detection circuit is electrically connected to the output end of the dry cell battery, and the output end of the battery detection circuit is connected to the input pin of the single-chip microcomputer, for detecting whether the dry cell battery is inserted and transmitting a level signal to the input pin of the single-chip microcomputer.

[0078] It is easy to understand that the dry cell battery detection circuit can turn on Q1 through Q5 to give the microcontroller high and low levels, so that the microcontroller can identify whether the dry cell battery is connected, so that the system can detect the dry cell battery and its power as an alternative power supply.

[0079] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dry lithium battery power supply control system, characterized in that: The system comprises: lithium batteries; dry cell batteries; load; an output control circuit, wherein a first input terminal of the output control circuit is connected to the output terminal of the lithium battery, a second input terminal of the output control circuit is connected to the output terminal of the dry cell battery, and an output terminal of the output control circuit is connected to the input terminal of the load; the output control circuit is used to control the on / off connection between the lithium battery and the load, and to control the on / off connection between the dry cell battery and the load; a power detection circuit, the power detection circuit being connected to the output end of the lithium battery and the output end of the dry cell, respectively, for detecting the battery power of the lithium battery and the dry cell and outputting a voltage signal; A single-chip microcomputer, wherein the input pin of the single-chip microcomputer is connected to the output end of the power detection circuit, and the output pin of the single-chip microcomputer is connected to the controlled end of the output control circuit. The single-chip microcomputer is used to detect according to the voltage signal, and when the voltage of the lithium battery is lower than a preset voltage, control the battery switching circuit to disconnect the path between the lithium battery and the load, and to connect the path between the dry battery and the load.

2. The dry lithium battery power supply control system according to claim 1, characterized in that: The dry lithium battery power supply control system also includes: The first switch circuit is electrically connected to the single chip microcomputer, the dry battery and the load respectively, and is used to conduct the path between the dry battery and the load when receiving the battery switching signal; The second switch circuit is electrically connected to the single chip microcomputer, the lithium battery and the load respectively, and is used to disconnect the path between the dry cell and the load when receiving a battery switching signal.

3. The dry lithium battery power supply control system according to claim 2, characterized in that: The first switching circuit includes a first NMOS transistor, a first PMOS transistor and a second PMOS transistor. The input end of the first NMOS transistor is connected to the output pin of the microcontroller, and the output end of the first NMOS transistor is connected to the output ends of the first PMOS transistor and the second PMOS transistor respectively.

4. The dry lithium battery power supply control system according to claim 3, characterized in that: The second switching circuit includes a second NMOS transistor, a third PMOS transistor and a fourth PMOS transistor. The input end of the second NMOS transistor is connected to the output pin of the microcontroller, and the output end of the second NMOS transistor is connected to the output ends of the third PMOS transistor and the fourth PMOS transistor respectively.

5. The dry lithium battery power supply control system according to claim 3, characterized in that: The first PMOS transistor and the second PMOS transistor are connected back to back, and the third PMOS transistor and the fourth PMOS transistor are connected back to back.

6. The dry lithium battery power supply control system according to claim 1, characterized in that: The dry lithium battery control system also includes: a lithium battery charging circuit, wherein an output terminal of the lithium battery charging circuit is electrically connected to an input terminal of the lithium battery, and is used to charge the lithium battery; A solar cell panel, wherein the output end of the solar cell panel is electrically connected to the first input end of the lithium battery circuit, and is used to convert external solar energy into electrical energy to charge the lithium battery through the lithium battery charging circuit.

7. The dry lithium battery power supply control system according to claim 4, characterized in that: The dry lithium battery control system also includes: A USB input interface, the USB input interface is connected to an external voltage and is used to receive the external voltage; A USB output interface is electrically connected to the second input terminal of the lithium battery charging circuit and is used to charge the lithium battery through the lithium battery charging circuit.

8. The dry lithium battery power supply control system according to claim 1, characterized in that: The dry lithium battery control system also includes: A charging current control circuit, wherein the input end of the charging current control circuit is electrically connected to the USB output interface and the load respectively, and the charging current control circuit is provided with a plurality of diodes and transistors to adjust the magnitude of the charging current according to the working state of the load.

9. The dry lithium battery power supply control system according to claim 1, characterized in that: The power detection circuit includes: Dry cell battery detection circuit; The input end of the dry cell detection circuit is electrically connected to the output end of the dry cell, and the output end of the battery detection circuit is connected to the input pin of the single chip microcomputer, for detecting whether the dry cell is inserted and transmitting a level signal to the input pin of the single chip microcomputer.

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