Control circuit of power supply system, control method thereof and control system

Abstract

The present application provides a control circuit, control method, and control system for a power supply system. The power supply system includes a battery cell, a charging chip, and a load connected in series. The control circuit includes a first switch device, a second switch device, and a third switch device. The first end of the first switch device is electrically connected to the battery cell, and the second end of the first switch device is electrically connected to the first end of the charging chip; the first end of the second switch device is electrically connected to the second end of the charging chip, and the second end of the second switch device is electrically connected to the load; the first end of the third switch device is electrically connected to the first end of the first switch device, and the second end of the third switch device is electrically connected to the second end of the second switch device. When the charging chip is in standby mode, the present application disconnects the first and second switches and turns on the third switch device, thereby ensuring that current does not flow through the charging chip, thereby ensuring low power consumption in the standby mode.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a control circuit of a power supply system, a control method thereof, a computer-readable storage medium, and a control system. Background Art

[0002] With the increasing use of battery-powered devices, the requirements for product battery life are becoming increasingly higher. Today, when battery technology has yet to make breakthroughs, lower standby power consumption is undoubtedly an effective way to solve this problem. Currently, when some charging circuits are not plugged in, even if the system enters standby mode, the Charge IC (charging chip) will continue to work, which will lead to increased standby power consumption and thus reduce product battery life.

[0003] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country to those skilled in the art. Summary of the Invention

[0004] The main purpose of this application is to provide a control circuit of a power supply system, a control method thereof, a computer-readable storage medium and a control system, so as to solve the problem in the prior art that when the product is in standby state, the charging chip is still working, resulting in high standby power consumption of the product.

[0005] According to one aspect of an embodiment of the present invention, a control circuit of a power supply system is provided, wherein the power supply system includes a battery cell, a charging chip and a load connected in series in sequence, and the control circuit includes a first switching device, a second switching device and a third switching device, wherein a first end of the first switching device is electrically connected to the battery cell, and a second end of the first switching device is electrically connected to a first end of the charging chip; a first end of the second switching device is electrically connected to a second end of the charging chip, and a second end of the second switching device is electrically connected to the load; a first end of the third switching device is electrically connected to a first end of the first switching device, and a second end of the third switching device is electrically connected to a second end of the second switching device.

[0006] Optionally, the first switching device includes a first switching device, a second switching device and a third switching device, wherein the first switching device includes three terminals, the first end of the first switching device is the first end of the first switching device, and the second end of the first switching device is the second end of the first switching device; the second switching device includes three terminals, the first end of the second switching device is electrically connected to the third end of the first switching device, and the second end of the second switching device is electrically connected to the battery cell; the third switching device includes three terminals, the first end of the third switching device is electrically connected to the third end of the second switching device, the second end of the third switching device is grounded, and the third end of the third switching device is used to be electrically connected to the controller.

[0007] Optionally, the second switching device includes a fourth switching device and a fifth switching device, wherein the fourth switching device includes three terminals, the first end of the fourth switching device is electrically connected to the battery cell, the second end of the fourth switching device is the first end of the second switching device, and the third end of the fourth switching device is the second end of the second switching device; the fifth switching device includes three terminals, the first end of the fifth switching device is electrically connected to the first end of the fourth switching device, the second end of the fifth switching device is grounded, and the third end of the fifth switching device is used to be electrically connected to the controller.

[0008] Optionally, the third switching device includes a sixth switching device, a seventh switching device and an eighth switching device, wherein the sixth switching device includes three terminals, and the first end of the sixth switching device is electrically connected to the first end of the first switching device; the seventh switching device includes three terminals, the first end of the seventh switching device is electrically connected to the second end of the sixth switching device, and the second end of the seventh switching device is electrically connected to the second end of the second switching device; the eighth switching device includes three terminals, the first end of the eighth switching device is electrically connected to the third end of the sixth switching device and the third end of the seventh switching device, respectively, the second end of the eighth switching device is grounded, and the third end of the eighth switching device is used to be electrically connected to the controller.

[0009] Optionally, the sixth switching device and the seventh switching device are both MOS tubes, the source of the sixth switching device is electrically connected to the source of the seventh switching device, the drain of the sixth switching device is electrically connected to the first end of the first switching device, the drain of the seventh switching device is electrically connected to the second end of the second switching device, the gate of the sixth switching device and the gate of the seventh switching device are respectively electrically connected to the first end of the eighth switching device, or the drain of the sixth switching device is electrically connected to the drain of the seventh switching device, the source of the sixth switching device is electrically connected to the first end of the first switching device, the source of the seventh switching device is electrically connected to the second end of the second switching device, and the gate of the sixth switching device and the gate of the seventh switching device are respectively electrically connected to the first end of the eighth switching device.

[0010] According to another aspect of an embodiment of the present invention, a control method for the control circuit of the power supply system is also provided, including: when it is detected that the charging chip enters the standby state, controlling the third switch device to turn on; after the third switch device is turned on for a first predetermined period of time, controlling the first switch device and the second switch device to turn off; when it is detected that the charging chip enters the charging and discharging state, controlling the first switch device and the second switch device to turn on; after the first switch device and the second switch device are turned on for a second predetermined period of time, controlling the third switch device to turn off.

[0011] Optionally, after the third switching device is turned on for a first predetermined period of time, the first switching device and the second switching device are controlled to be disconnected, including: after the third switching device is turned on for the first predetermined period of time, one of the first switching device and the second switching device is controlled to be disconnected; after one of the first switching device and the second switching device is disconnected for a third predetermined period of time, the other of the first switching device and the second switching device is controlled to be disconnected; when it is detected that the charging chip enters the charging and discharging state, the first switching device and the second switching device are controlled to be turned on, including: when it is detected that the charging chip enters the charging and discharging state, one of the first switching device and the second switching device is controlled to be turned on; after one of the first switching device and the second switching device is turned on for a fourth predetermined period of time, the other of the first switching device and the second switching device is controlled to be turned on.

[0012] Optionally, the control circuit is the control circuit that controls the first switching device to be turned on or off, including: controlling the input of a first predetermined level signal to the third end of the third switching device so that the third switching device is turned on or off, so that the second switching device and the first switching device are turned on or off in sequence.

[0013] Optionally, the control circuit is the control circuit that controls the second switching device to be turned on or off, including: controlling the input of a second predetermined level signal to the third end of the fifth switching device so that the fifth switching device is turned on or off, so as to turn the fourth switching device on or off.

[0014] Optionally, the control circuit is the control circuit that controls the third switching device to be turned on or off, including: controlling the input of a third predetermined level signal to the third end of the eighth switching device so that the eighth switching device is turned on or off, so as to turn the sixth switching device and the seventh switching device on or off.

[0015] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described above.

[0016] According to another aspect of an embodiment of the present invention, a control system is also provided, which includes a power supply system, a control circuit of the power supply system, and a controller, wherein the power supply system includes a battery unit, a charging chip, and a load connected in series in sequence; the control circuit of the power supply system is the control circuit of any one of the power supply systems described; and the controller is used to execute any one of the control methods described.

[0017] In an embodiment of the present invention, in the control circuit of the power supply system, the power supply system includes a battery cell, a charging chip and a load connected in series in sequence, and the control circuit includes a first switch device, a second switch device and a third switch device, wherein the first switch device is electrically connected to the battery cell and the charging chip respectively; the second switch device is electrically connected to the charging chip and the load respectively; and the battery cell and the load are also electrically connected through the third switch device. In the control circuit of the power supply system of the present application, when the charging chip is in the standby state, by disconnecting the first switch device and the second switch device and turning on the third switch device, it can be ensured that current does not flow through the charging chip, thereby ensuring that the charging chip does not generate power consumption in the standby state and ensuring that the standby power consumption of the product is low. At the same time, when the charging chip is in the charging and discharging state, by turning on the first switch device and the second switch device and disconnecting the third switch device, it does not affect the operation of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0019] Figure 1 A schematic diagram of a control circuit of a power supply system according to an embodiment of the present application is shown;

[0020] Figure 2 as well as Figure 3 Two schematic diagrams showing connection relationships of the third switch device according to the embodiment of the present application are shown respectively;

[0021] Figure 4 A flow chart showing a method for controlling a control circuit of a power supply system according to an embodiment of the present application is shown;

[0022] Figure 5 A schematic diagram of a control device of a control circuit of a power supply system according to an embodiment of the present application is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Battery cell; 20. Charging chip; 30. Load; 40. First switching device; 50. Second switching device; 60. Third switching device; 70. Controller; 41. First switching device; 42. Second switching device; 43. Third switching device; 44. First resistor; 45. Second resistor; 51. Fourth switching device; 52. Fifth switching device; 53. Third resistor; 61. Sixth switching device; 62. Seventh switching device; 63. Eighth switching device; 80. First control unit; 90. Second control unit; 100. Third control unit; 110. Fourth control unit. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element or intervening elements may be present. Moreover, in the specification and claims, when it is described that an element is "connected to" another element, the element may be "directly connected to" the other element or "connected to" the other element through a third element.

[0029] As mentioned in the background technology, in the prior art, when the product is in standby mode, the charging chip is still working, resulting in high standby power consumption of the product. In order to solve the above problem, in a typical embodiment of the present application, a control circuit of a power supply system, a control method thereof, a computer-readable storage medium and a control system are provided.

[0030] In a typical embodiment of the present application, a control circuit of a power supply system is provided, such as Figure 1 As shown, the power supply system includes a battery cell 10, a charging chip 20 and a load 30 connected in series in sequence, and the control circuit includes a first switch device 40, a second switch device 50 and a third switch device 60, wherein the first end of the first switch device 40 is electrically connected to the battery cell 10, and the second end of the first switch device 40 is electrically connected to the first end of the charging chip 20; the first end of the second switch device 50 is electrically connected to the second end of the charging chip 20, and the second end of the second switch device 50 is electrically connected to the load 30; the first end of the third switch device 60 is electrically connected to the first end of the first switch device 40, and the second end of the third switch device 60 is electrically connected to the second end of the second switch device 50.

[0031] In the control circuit of the power supply system, the power supply system includes a battery cell, a charging chip and a load connected in series in sequence, and the control circuit includes a first switch device, a second switch device and a third switch device, wherein the first switch device is electrically connected to the battery cell and the charging chip respectively; the second switch device is electrically connected to the charging chip and the load respectively; and the battery cell and the load are also electrically connected through the third switch device. In the control circuit of the power supply system of the present application, when the charging chip is in the standby state, by disconnecting the first switch device and the second switch device and turning on the third switch device, it can be ensured that current does not flow through the charging chip, thereby ensuring that the charging chip does not generate power consumption in the standby state and ensuring that the standby power consumption of the product is low. At the same time, when the charging chip is in the charging and discharging state, by turning on the first switch device and the second switch device and disconnecting the third switch device, it does not affect the operation of the product.

[0032] In order to further ensure that the controller has a better control effect on the switching state of the first switching device, in one embodiment of the present application, Figure 1 As shown, the first switching device 40 includes a first switching device 41, a second switching device 42 and a third switching device 43, wherein the first switching device 41 includes three terminals, the first end of the first switching device 41 is the first end of the first switching device 40, and the second end of the first switching device 41 is the second end of the first switching device 40; the second switching device 42 includes three terminals, the first end of the second switching device 42 is electrically connected to the third end of the first switching device 41, and the second end of the second switching device 42 is electrically connected to the battery cell 10; the third switching device 43 includes three terminals, the first end of the third switching device 43 is electrically connected to the third end of the second switching device 42, the second end of the third switching device 43 is grounded, and the third end of the third switching device 43 is used to be electrically connected to the controller 70.

[0033] In the above embodiment, if the above-mentioned first switching device only includes the above-mentioned first switching device, since the voltage output by the above-mentioned battery cell is variable, when the output voltage of the above-mentioned battery cell is high, the above-mentioned first switching device will always be in the on state, and the above-mentioned controller cannot control the above-mentioned first switching device to be disconnected when the above-mentioned charging chip is in the standby state. Only when the output voltage of the above-mentioned battery cell is low can the above-mentioned controller control the above-mentioned first switching device to be disconnected. Therefore, it is necessary to control the switching state of the above-mentioned first switching device through the above-mentioned third switching device and the above-mentioned second switching device.

[0034] In a specific embodiment of the present application, Figure 1As shown, the first switching device 41, the second switching device 42 and the third switching device 43 are all MOS tubes. The source of the first switching device 41 is electrically connected to the battery cell 10, the drain of the first switching device 41 is electrically connected to the charging chip 20, the gate of the first switching device 41 is electrically connected to the drain of the second switching device 42, the source of the second switching device 42 is electrically connected to the battery cell 10 through the first resistor 44, the gate of the second switching device 42 is electrically connected to the drain of the third switching device 43, and the gate of the second switching device 42 and the drain of the third switching device 43 are electrically connected to the battery cell 10 through the second resistor 45 and the first resistor 44 respectively. The source of the third switching device 43 is grounded, and the gate of the third switching device 43 is electrically connected to the controller 70.

[0035] In the above embodiment, the reason why the first switching device including the first switching device, the second switching device and the third switching device must be used instead of directly using the IO pin of the controller to control the switch of a MOS tube is as follows: the output voltage VBAT of the battery cell varies, and its variation range is 3.0-4.2V. When the output voltage VBAT is high, that is, VBAT-VMCU>VgsOn, where VMCU is the output voltage of the controller and VgsOn is Figure 1 The controller will be unable to control the first switching device to disconnect if the output voltage VBAT is too low. The controller can only control the first switching device to disconnect when the output voltage VBAT is low. This is because the controller's power supply voltage VMCU is converted from VBAT via the DCDC. When VBAT is higher than the normal operating input voltage of the DCDC, VMCU remains at 3.3V regardless of VBAT. That is, the gate of the first switching device is always Vg = 3.3V. During use, VBAT gradually decreases from 4.2V to the discharge cut-off voltage (assuming 3V). Therefore, the gate-source voltage range of the first switching device is 0.9-0V. When the gate-source voltage is 0.9V, the first switching device can be turned on. When the gate-source voltage is 0.4V, the first switching device is turned off. Therefore, the above phenomenon is solved.

[0036] In another embodiment of the present application, Figure 1As shown, the second switching device 50 includes a fourth switching device 51 and a fifth switching device. The fourth switching device 51 includes three terminals, a first terminal of the fourth switching device 51 being electrically connected to the battery cell 10, a second terminal of the fourth switching device 51 being the first terminal of the second switching device 50, and a third terminal of the fourth switching device 51 being the second terminal of the second switching device 50. The fifth switching device 52 includes three terminals, a first terminal of the fifth switching device 52 being electrically connected to the first terminal of the fourth switching device 51, a second terminal of the fifth switching device 52 being grounded, and a third terminal of the fifth switching device 52 being electrically connected to the controller 70. The second switching device includes the fourth switching device and the fifth switching device, thereby further ensuring that the controller has better control over the switching state of the second switching device.

[0037] In a specific embodiment of the present application, Figure 1 As shown, the gate of the fourth switching device 51 is electrically connected to the battery cell 10 through the third resistor 53, the drain of the fourth switching device 51 is electrically connected to the charging chip 20, and the source of the fourth switching device 51 is electrically connected to the load 30; the drain of the fifth switching device 52 is electrically connected to the gate of the fourth switching device 51, the source of the fifth switching device 52 is grounded, and the gate of the fifth switching device 52 is electrically connected to the controller 70.

[0038] In another embodiment of the present application, Figure 1 As shown, the third switch device 60 includes a sixth switch device 61, a seventh switch device, and an eighth switch device 63. The sixth switch device 61 includes three terminals, a first end of which is electrically connected to the first end of the first switch device 40. The seventh switch device 62 includes three terminals, a first end of which is electrically connected to the second end of the sixth switch device 61, and a second end of which is electrically connected to the second end of the second switch device 50. The eighth switch device 63 includes three terminals, a first end of which is electrically connected to the third end of the sixth switch device 61 and the third end of the seventh switch device 62, respectively. The second end of the eighth switch device 63 is grounded, and the third end of the eighth switch device 63 is electrically connected to the controller 70. The third switch device includes the sixth, seventh, and eighth switch devices. This connection method further ensures that the controller effectively controls the switching state of the third switch device.

[0039] At present, most MOS tubes have body diodes, which make MOS tubes only unidirectionally cut off, but not bidirectionally cut off. If the third switch device mentioned above uses only one MOS tube, when the battery cell is cut off from the load, the charging chip will lose part of the charging management function during charging, and the charging management will be incomplete, which may cause the battery cell to be overcharged or over-discharged and affect the life of the battery cell; in addition, when the load is cut off from the battery cell, the power supply system will not be able to enter the shipping mode (Ship mode), thereby causing problems such as transportation or storage anomalies. The shipping mode refers to the lowest static current state of the device, that is, the state of disconnecting the battery cell. In order to avoid the above problems, in another embodiment of the present application, the sixth switch device 61 and the seventh switch device 62 are both MOS tubes, such as Figure 2 As shown, the source of the sixth switching device 61 is electrically connected to the source of the seventh switching device 62, the drain of the sixth switching device 61 is electrically connected to the first end of the first switching device 40, the drain of the seventh switching device 62 is electrically connected to the second end of the second switching device 50, and the gate of the sixth switching device 61 and the gate of the seventh switching device 62 are respectively electrically connected to the first end of the eighth switching device 63, or as shown in FIG. Figure 3 As shown, the drain of the sixth switching device 61 is electrically connected to the drain of the seventh switching device 62, the source of the sixth switching device 61 is electrically connected to the first terminal of the first switching device 40, the source of the seventh switching device 62 is electrically connected to the second terminal of the second switching device 50, and the gates of the sixth switching device 61 and the seventh switching device 62 are respectively electrically connected to the first terminal of the eighth switching device 63. In this embodiment, the controller uses two PMOS transistors to control the on / off of this path, achieving bidirectional conduction and bidirectional cutoff, thereby resolving the aforementioned problem.

[0040] Specifically, if Figure 2 As shown, the source of the sixth switching device 61 is electrically connected to the source of the seventh switching device 62, the drain of the sixth switching device 61 is electrically connected to the first end of the first switching device 40, the drain of the seventh switching device 62 is electrically connected to the second end of the second switching device 50, the gate of the sixth switching device 61 and the gate of the seventh switching device 62 are electrically connected to the drain of the eighth switching device 63, respectively, the source of the eighth switching device is grounded, and the gate of the eighth switching device is electrically connected to the controller 70, or, as shown Figure 3As shown, the drain of the sixth switching device 61 is electrically connected to the drain of the seventh switching device 62, the source of the sixth switching device 61 is electrically connected to the first end of the first switching device 40, the source of the seventh switching device 62 is electrically connected to the second end of the second switching device 50, and the gate of the sixth switching device 61 and the gate of the seventh switching device 62 are respectively electrically connected to the drain of the eighth switching device 63.

[0041] The present application also provides a method for controlling a control circuit of a power supply system, which can be applied to a controller such as an MCU.

[0042] Figure 4 FIG. 1 is a flow chart of a control method for a control circuit of a power supply system according to an embodiment of the present application. Figure 4 As shown, the method includes the following steps:

[0043] Step S101, when it is detected that the charging chip enters the standby state, controlling the third switch device to be turned on;

[0044] Step S102, after the third switch device is turned on for a first predetermined time, controlling the first switch device and the second switch device to be turned off;

[0045] Step S103, when detecting that the charging chip enters the charging and discharging state, controlling the first switching device and the second switching device to be turned on;

[0046] Step S104 : After the first switching device and the second switching device are turned on for a second predetermined time period, the third switching device is controlled to be turned off.

[0047] The control method of the control circuit of the power supply system of this embodiment, when detecting that the charging chip enters the standby state, first controls the third switch device to be turned on; then, after the third switch device is turned on for a first predetermined time, controls the first switch device and the second switch device to be turned off; when detecting that the charging chip enters the charge and discharge state, first controls the first switch device and the second switch device to be turned on, and after the first switch device and the second switch device are turned on for a second predetermined time, controls the third switch device to be turned off. The above method of the present application, when the charging chip is in the standby state, first turns on the third switch device, and then turns off the first switch device and the second switch device after the first predetermined time, can ensure that current does not flow through the charging chip, thereby ensuring that the charging chip does not generate power consumption in the standby state, and ensuring that the standby power consumption of the product is low. When the charging chip is in the charge and discharge state, by turning on the first switch device and the second switch device, and turning off the third switch device after the second predetermined time, it is ensured that the product operation is not affected. At the same time, the method avoids system bugs caused by disconnecting the first and second switching devices while turning on the third switching device, and disconnecting the electrical switching device while turning on the first and second switching devices.

[0048] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0049] In a specific embodiment of the present application, when the above-mentioned battery unit is powered for the first time, the above-mentioned controller has not burned the code, the above-mentioned first switching device of the above-mentioned first switching device is in the on state by default, and the above-mentioned fourth switching device of the above-mentioned second switching device is off by default. Although the above-mentioned controller has not yet controlled the above-mentioned fourth switching device of the above-mentioned second switching device to be turned on, the above-mentioned fourth switching device is turned on from drain to source through the body diode of the above-mentioned fourth switching device, and the above-mentioned battery unit supplies power to the circuit through the above-mentioned charging chip.

[0050] In one embodiment of the present application, Figure 1As shown, after the third switch device 60 is turned on for the first predetermined time, the first switch device 40 and the second switch device 50 are controlled to be disconnected, including: after the third switch device 60 is turned on for the first predetermined time, one of the first switch device 40 and the second switch device 50 is controlled to be disconnected; after one of the first switch device 40 and the second switch device 50 is disconnected for a third predetermined time, the other of the first switch device 40 and the second switch device 50 is controlled to be disconnected; when it is detected that the charging chip 20 enters the charging and discharging state, the first switch device 40 and the second switch device 50 are controlled to be turned on, including: when it is detected that the charging chip 20 enters the charging and discharging state, one of the first switch device 40 and the second switch device 50 is controlled to be turned on; after one of the first switch device 40 and the second switch device 50 is turned on for a fourth predetermined time, the other of the first switch device 40 and the second switch device 50 is controlled to be turned on. The state switching of the above-mentioned first switching device, the above-mentioned second switching device and the above-mentioned third switching device is achieved by the above-mentioned controller controlling the on and off of the MOS tube. Through the delay time of the above-mentioned first predetermined time length, the above-mentioned third predetermined time length and the above-mentioned fourth predetermined time length, the system BUG caused by direct state switching is further avoided.

[0051] Specifically, in the above embodiment, the situation in which the above-mentioned first switching device and the above-mentioned second switching device are turned on and the above-mentioned third switching device is turned off is called a non-bypass state, and the situation in which the above-mentioned first switching device and the above-mentioned second switching device are turned off and the above-mentioned third switching device is turned on is called a bypass state. If there is no delay time of the above-mentioned first predetermined time length, the above-mentioned third predetermined time length and the above-mentioned fourth predetermined time length, a BUG will occur, which may lead to the following cycle process: the MOS tube in the non-bypass state is not fully turned on → the MOS tube in the bypass state is turned off → the controller is powered off → enters the default non-bypass state without controller control → the controller system is restarted → the bypass state program is executed → switches to the non-bypass state → the MOS tube in the non-bypass state is not fully turned on

[0052] In a specific embodiment of the present application, when the charging chip detects that a charger is connected, it generates a charging request message and sends it to the controller. The specific steps for the controller to control the charging chip to enter the charging mode according to the request message are: controlling one of the first switching device and the second switching device to be turned on; after one of the first switching device and the second switching device is turned on for a fourth predetermined period of time, controlling the other of the first switching device and the second switching device to be turned on, and controlling the third switching device to be disconnected after the second predetermined period of time, thereby further avoiding system bugs caused by direct state switching.

[0053] In another specific embodiment of the present application, when the charging chip detects that the KEY_RST pin is pressed for 5 seconds, it will generate a request information for entering the transport mode and send it to the controller. The controller controls the charging chip to enter the transport mode according to the request information, which is divided into the following two situations: the charging chip is controlled to enter the transport mode by the first switch device and the second switch device being disconnected and the third switch device being turned on; the charging chip is controlled to enter the transport mode by the first switch device and the second switch device being turned on and the third switch device being disconnected.

[0054] Specifically, the charging chip enters the Ship mode when the first and second switches are disconnected and the third switch is on. The specific steps are as follows: one of the first and second switches is turned on; after one of the first and second switches has been on for a fifth predetermined time, the other of the first and second switches is turned on; and after a sixth predetermined time, the third switch is turned off. A delay time is set for the charging chip to enter Ship mode, and after the delay time expires, the charging chip is controlled to enter Ship mode. Furthermore, exiting Ship mode involves pressing the KEY_RST button on the charging IC for a predetermined period of time to exit Ship mode.

[0055] In another embodiment of the present application, Figure 1As shown, in the control circuit, the first switching device 40 includes a first switching device 41, a second switching device 42, and a third switching device 43, wherein the first switching device 41 includes three terminals, a first end of the first switching device 41 is the first end of the first switching device 40, and a second end of the first switching device 41 is the second end of the first switching device 40; the second switching device 42 includes three terminals, a first end of the second switching device 42 is electrically connected to the third end of the first switching device 41, and a second end of the second switching device 42 is electrically connected to the battery cell 10; the third switching device 43 includes three terminals, a first end of the third switching device 43 is electrically connected to the third end of the second switching device 42, a second end of the third switching device 43 is grounded, and a third end of the third switching device 43 is electrically connected to the controller 70. Controlling the first switching device 40 to be turned on or off includes: controlling the third end of the third switching device 43 to input a first predetermined level signal to turn the third switching device 43 on or off, so that the second switching device 42 and the first switching device 41 are turned on or off in sequence. The controller controls the conduction state of the third switching device, thereby controlling the conduction states of the first switching device and the second switching device, and has a better control effect on the switching state of the first switching device.

[0056] In another embodiment of the present application, Figure 1 As shown, the second switch device 50 in the control circuit includes a fourth switch device 51 and a fifth switch device. The fourth switch device 51 includes three terminals. A first terminal of the fourth switch device 51 is electrically connected to the battery cell 10, a second terminal of the fourth switch device 51 serves as the first terminal of the second switch device 50, and a third terminal of the fourth switch device 51 serves as the second terminal of the second switch device 50. The fifth switch device 52 includes three terminals. A first terminal of the fifth switch device 52 is electrically connected to the first terminal of the fourth switch device 51, a second terminal of the fifth switch device 52 is grounded, and a third terminal of the fifth switch device 52 is electrically connected to the controller 70. Controlling the second switch device 50 to turn on or off includes: controlling the input of a second predetermined level signal to the third terminal of the fifth switch device 52, thereby turning the fifth switch device 52 on or off, thereby turning the fourth switch device 51 on or off. The controller controls the conduction state of the fifth switch device, thereby controlling the conduction state of the fourth switch device, thereby achieving a good control effect on the switching state of the second switch device.

[0057] In another embodiment of the present application, Figure 1 、 Figure 2 as well as Figure 3As shown, in the control circuit, the third switch device 60 includes a sixth switch device 61, a seventh switch device, and an eighth switch device 63, wherein the sixth switch device 61 includes three terminals, a first end of the sixth switch device 61 is electrically connected to the first end of the first switch device 40; the seventh switch device 62 includes three terminals, a first end of the seventh switch device 62 is electrically connected to the second end of the sixth switch device 61, and a second end of the seventh switch device 62 is electrically connected to the second end of the second switch device 50; the eighth switch device 63 includes three terminals, a first end of the eighth switch device 63 is electrically connected to the third end of the sixth switch device 61 and the third end of the seventh switch device 62, respectively, a second end of the eighth switch device 63 is grounded, and a third end of the eighth switch device 63 is electrically connected to the controller 70. Controlling the third switch device 60 to be turned on or off includes: controlling the third end of the eighth switch device 63 to input a third predetermined level signal to the third end so that the eighth switch device 63 is turned on or off, thereby turning on or off the sixth switch device 61 and the seventh switch device 62. The controller controls the conduction state of the eighth switching device, thereby controlling the conduction states of the sixth switching device and the seventh switching device, and has a good control effect on the switching state of the third switching device.

[0058] In a specific embodiment, the predetermined time length may be 1 second, and those skilled in the art may also flexibly set it according to actual conditions.

[0059] The present application also provides a control device for a control circuit of a power supply system. It should be noted that the control device for a control circuit of a power supply system in the present application can be used to execute the control method for a control circuit of a power supply system provided in the present application. The following describes the control device for a control circuit of a power supply system provided in the present application.

[0060] Figure 5 Schematic diagram of a control device of a control circuit of a power supply system according to an embodiment of the present application. Figure 5As shown, the device includes a first control unit 80, a second control unit 90, a third control unit 100 and a fourth control unit 110, wherein the first control unit 80 is used to control the third switch device to be turned on when it is detected that the charging chip enters the standby state; the second control unit 90 is used to control the first switch device and the second switch device to be turned off after the third switch device is turned on for a first predetermined period of time; the third control unit 100 is used to control the first switch device and the second switch device to be turned on when it is detected that the charging chip enters the charging and discharging state; the fourth control unit 110 is used to control the third switch device to be turned off after the first switch device and the second switch device are turned on for a second predetermined period of time.

[0061] The control device of the control circuit of the power supply system of this embodiment controls the third switch device to be turned on when the charging chip enters the standby state through the first control unit; after the third switch device is turned on for a first predetermined time, the first and second switch devices are turned off through the second control unit; when the charging chip enters the charge / discharge state, the first and second switch devices are turned on through the third control unit; after the first and second switch devices are turned on for a second predetermined time, the third switch device is turned off through the fourth control unit. The device of the present application first turns on the third switch device when the charging chip is in the standby state, and then turns off the first and second switch devices after the first predetermined time. This ensures that current does not flow through the charging chip, thereby ensuring that the charging chip does not consume power in the standby state and ensuring low standby power consumption of the product. When the charging chip is in the charge / discharge state, the first and second switch devices are turned on, and the third switch device is turned off after the second predetermined time, ensuring that the product operation is not affected. At the same time, the device avoids system bugs caused by disconnecting the first and second switching devices while turning on the third switching device, and disconnecting the electrical switching device while turning on the first and second switching devices.

[0062] In a specific embodiment of the present application, when the above-mentioned battery unit is powered for the first time, the above-mentioned controller has not burned the code, the above-mentioned first switching device of the above-mentioned first switching device is in the on state by default, and the above-mentioned fourth switching device of the above-mentioned second switching device is off by default. Although the above-mentioned controller has not yet controlled the above-mentioned fourth switching device of the above-mentioned second switching device to be turned on, the above-mentioned fourth switching device is turned on from drain to source through the body diode of the above-mentioned fourth switching device, and the above-mentioned battery unit supplies power to the circuit through the above-mentioned charging chip.

[0063] In one embodiment of the present application, Figure 1As shown, after the third switch device 60 is turned on for the first predetermined time, the first switch device 40 and the second switch device 50 are controlled to be disconnected, including: after the third switch device 60 is turned on for the first predetermined time, one of the first switch device 40 and the second switch device 50 is controlled to be disconnected; after one of the first switch device 40 and the second switch device 50 is disconnected for a third predetermined time, the other of the first switch device 40 and the second switch device 50 is controlled to be disconnected, and the two control units include a first control subunit and a second control subunit, wherein the first control subunit is used to control the first switch device 40 and the second switch device 50 after the third switch device 60 is turned on for the first predetermined time. The first control subunit is configured to control one of the first and second switching devices 40, 50 to be turned off after one of the first and second switching devices 40, 50 has been turned off for a third predetermined time. The third control unit includes a third control subunit and a fourth control subunit. The third control subunit is configured to control one of the first and second switching devices 40, 50 to be turned on upon detecting that the charging chip 20 has entered the charging and discharging state. The fourth control subunit is configured to control the other of the first and second switching devices 40, 50 to be turned on after one of the first and second switching devices 40, 50 has been turned on for a fourth predetermined time. The state switching of the first, second, and third switching devices is achieved by the controller controlling the on and off of the MOS transistors. The delay times of the first, third, and fourth predetermined time periods further prevent system bugs caused by direct state switching.

[0064] Specifically, in the above embodiment, the situation in which the above-mentioned first switching device and the above-mentioned second switching device are turned on and the above-mentioned third switching device is turned off is called a non-bypass state, and the situation in which the above-mentioned first switching device and the above-mentioned second switching device are turned off and the above-mentioned third switching device is turned on is called a bypass state. If there is no delay time of the above-mentioned first predetermined time length, the above-mentioned third predetermined time length and the above-mentioned fourth predetermined time length, a BUG will occur, which may lead to the following cycle process: the MOS tube in the non-bypass state is not fully turned on → the MOS tube in the bypass state is turned off → the controller is powered off → enters the default non-bypass state without controller control → the controller system is restarted → the bypass state program is executed → switches to the non-bypass state → the MOS tube in the non-bypass state is not fully turned on

[0065] In a specific embodiment of the present application, when the charging chip detects that a charger is connected, it generates a charging request message and sends it to the controller. The specific steps for the controller to control the charging chip to enter the charging mode according to the request message are: controlling one of the first switching device and the second switching device to be turned on; after one of the first switching device and the second switching device is turned on for a fourth predetermined period of time, controlling the other of the first switching device and the second switching device to be turned on, and controlling the third switching device to be disconnected after the second predetermined period of time, thereby further avoiding system bugs caused by direct state switching.

[0066] In another specific embodiment of the present application, when the charging chip detects that the KEY_RST pin is pressed for 5 seconds, it will generate a request information for entering the transport mode and send it to the controller. The controller controls the charging chip to enter the transport mode according to the request information, which is divided into the following two situations: the charging chip is controlled to enter the transport mode by the first switch device and the second switch device being disconnected and the third switch device being turned on; the charging chip is controlled to enter the transport mode by the first switch device and the second switch device being turned on and the third switch device being disconnected.

[0067] Specifically, the charging chip enters the Ship mode when the first and second switches are disconnected and the third switch is on. The specific steps are as follows: one of the first and second switches is turned on; after one of the first and second switches has been on for a fifth predetermined time, the other of the first and second switches is turned on; and after a sixth predetermined time, the third switch is turned off. A delay time is set for the charging chip to enter Ship mode, and after the delay time expires, the charging chip is controlled to enter Ship mode. Furthermore, exiting Ship mode involves pressing the KEY_RST button on the charging IC for a predetermined period of time to exit Ship mode.

[0068] In another embodiment of the present application, Figure 1As shown, in the control circuit, the first switching device 40 includes a first switching device 41, a second switching device 42 and a third switching device 43, wherein the first switching device 41 includes three terminals, a first end of the first switching device 41 is the first end of the first switching device 40, and a second end of the first switching device 41 is the second end of the first switching device 40; the second switching device 42 includes three terminals, a first end of the second switching device 42 is electrically connected to the third end of the first switching device 41, and a second end of the second switching device 42 is electrically connected to the battery cell 10; The third switching device 43 includes three terminals. A first terminal of the third switching device 43 is electrically connected to the third terminal of the second switching device 42, a second terminal of the third switching device 43 is grounded, and a third terminal of the third switching device 43 is electrically connected to the controller 70. The second and third control units both include a fifth control subunit, which is configured to control the input of a first predetermined level signal to the third terminal of the third switching device 43, thereby turning the third switching device 43 on or off, thereby sequentially turning the second switching device 42 and the first switching device 41 on or off. The controller controls the conduction state of the third switching device, thereby controlling the conduction states of the first and second switching devices, effectively controlling the switching state of the first switching device.

[0069] In another embodiment of the present application, Figure 1 As shown, in the control circuit, the second switch device 50 includes a fourth switch device 51 and a fifth switch device. The fourth switch device 51 includes three terminals. A first terminal of the fourth switch device 51 is electrically connected to the battery cell 10, a second terminal of the fourth switch device 51 serves as the first terminal of the second switch device 50, and a third terminal of the fourth switch device 51 serves as the second terminal of the second switch device 50. The fifth switch device 52 includes three terminals. A first terminal of the fifth switch device 52 is electrically connected to the first terminal of the fourth switch device 51, a second terminal of the fifth switch device 52 is grounded, and a third terminal of the fifth switch device 52 is electrically connected to the controller 70. The second and third control units both include a sixth control subunit, which is configured to control the input of a second predetermined level signal to the third terminal of the fifth switch device 52, thereby turning the fifth switch device 52 on or off, thereby turning the fourth switch device 51 on or off. The controller controls the conduction state of the fifth switch device, thereby controlling the conduction state of the fourth switch device, thereby effectively controlling the on-off state of the second switch device.

[0070] In another embodiment of the present application, Figure 1 、 Figure 2 as well as Figure 3 As shown, in the control circuit, the third switch device 60 includes a sixth switch device 61, a seventh switch device, and an eighth switch device 63, wherein the sixth switch device 61 includes three terminals, a first end of the sixth switch device 61 is electrically connected to the first end of the first switch device 40; the seventh switch device 62 includes three terminals, a first end of the seventh switch device 62 is electrically connected to the second end of the sixth switch device 61, and a second end of the seventh switch device 62 is electrically connected to the second end of the second switch device 50; the eighth switch device 63 includes three terminals, a first end of the eighth switch device 63 is electrically connected to the third end of the sixth switch device 61 and the third end of the seventh switch device 62, respectively, a second end of the eighth switch device 63 is grounded, and a third end of the eighth switch device 63 is electrically connected to the controller 70. The first control unit and the fourth control unit both include a seventh control subunit, and the seventh control subunit is configured to control the input of a third predetermined level signal to the third end of the eighth switch device 63, so that the eighth switch device 63 is turned on or off, thereby turning on or off the sixth switch device 61 and the seventh switch device 62. The controller controls the conduction state of the eighth switching device, thereby controlling the conduction states of the sixth switching device and the seventh switching device, and has a good control effect on the switching state of the third switching device.

[0071] In a specific embodiment, the predetermined time length may be 1 second, and those skilled in the art may also flexibly set it according to actual conditions.

[0072] The control device of the control circuit of the above-mentioned power supply system includes a processor and a memory. The above-mentioned first control unit, the above-mentioned second control unit, the above-mentioned third control unit and the above-mentioned fourth control unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0073] The processor includes a core, which retrieves the corresponding program unit from the memory. One or more cores can be configured, and adjusting the core parameters solves the existing problem of high standby power consumption caused by the charging chip still operating when the product is in standby mode.

[0074] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0075] An embodiment of the present invention provides a computer-readable storage medium having a program stored thereon. When the program is executed by a processor, the control method of the control circuit of the power supply system described above is implemented.

[0076] An embodiment of the present invention provides a processor, which is used to run a program, wherein the program executes the control method of the control circuit of the power supply system when running.

[0077] An embodiment of the present invention provides a device, comprising a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, at least the following steps are performed:

[0078] Step S101, when it is detected that the charging chip enters the standby state, controlling the third switch device to be turned on;

[0079] Step S102, after the third switch device is turned on for a first predetermined time, controlling the first switch device and the second switch device to be turned off;

[0080] Step S103, when detecting that the charging chip enters the charging and discharging state, controlling the first switching device and the second switching device to be turned on;

[0081] Step S104 : After the first switching device and the second switching device are turned on for a second predetermined time period, the third switching device is controlled to be turned off.

[0082] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0083] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0084] Step S101, when it is detected that the charging chip enters the standby state, controlling the third switch device to be turned on;

[0085] Step S102, after the third switch device is turned on for a first predetermined time, controlling the first switch device and the second switch device to be turned off;

[0086] Step S103, when detecting that the charging chip enters the charging and discharging state, controlling the first switching device and the second switching device to be turned on;

[0087] Step S104 : After the first switching device and the second switching device are turned on for a second predetermined time period, the third switching device is controlled to be turned off.

[0088] According to another aspect of an embodiment of the present invention, a control system is also provided, including a power supply system, a control circuit of any one of the above-mentioned power supply systems, and a controller, wherein the above-mentioned power supply system includes a battery unit, a charging chip, and a load connected in series in sequence; the above-mentioned controller is used to execute any one of the above-mentioned control methods.

[0089] In the control system of the present application, by executing any of the control methods of the above-mentioned power supply systems through the controller, when the above-mentioned charging chip is in the standby state, it can be ensured that current does not flow through the above-mentioned charging chip, thereby ensuring that the above-mentioned charging chip does not generate power consumption in the standby state, and ensuring that the standby power consumption of the product is low; when the above-mentioned charging chip is in the charging and discharging state, it is ensured that the product operation is not affected. At the same time, it can avoid system bugs caused by disconnecting the first switching device and the second switching device while turning on the third switching device, and disconnecting the above-mentioned electrical switching device while turning on the above-mentioned first switching device and the above-mentioned second switching device, thereby ensuring that the standby power consumption of the control system is low and the stability is good.

[0090] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the above-mentioned units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0092] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0093] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0094] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0095] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0096] 1) In the control circuit of the power supply system of the present application, the power supply system includes a battery unit, a charging chip and a load connected in series in sequence, and the control circuit includes a first switch device, a second switch device and a third switch device, wherein the first switch device is electrically connected to the battery unit and the charging chip respectively; the second switch device is electrically connected to the charging chip and the load respectively; and the battery unit and the load are also electrically connected through the third switch device. In the control circuit of the power supply system of the present application, when the charging chip is in the standby state, by disconnecting the first switch device and the second switch device and turning on the third switch device, it can be ensured that current does not flow through the charging chip, thereby ensuring that the charging chip does not generate power consumption in the standby state and ensuring that the standby power consumption of the product is low. At the same time, when the charging chip is in the charging and discharging state, by turning on the first switch device and the second switch device and disconnecting the third switch device, it does not affect the operation of the product.

[0097] 2) The control method of the control circuit of the power supply system of the present application, when detecting that the charging chip enters the standby state, first controls the third switch device to be turned on; then, after the third switch device is turned on for a first predetermined time, controls the first switch device and the second switch device to be turned off; when detecting that the charging chip enters the charge and discharge state, first controls the first switch device and the second switch device to be turned on, and after the first switch device and the second switch device are turned on for a second predetermined time, controls the third switch device to be turned off. The above method of the present application, when the charging chip is in the standby state, first turns on the third switch device, and then turns off the first switch device and the second switch device after the first predetermined time, can ensure that current does not flow through the charging chip, thereby ensuring that the charging chip does not generate power consumption in the standby state, and ensuring that the standby power consumption of the product is low. When the charging chip is in the charge and discharge state, by turning on the first switch device and the second switch device, and turning off the third switch device after the second predetermined time, it is ensured that the product operation is not affected. At the same time, the method avoids system bugs caused by disconnecting the first and second switching devices while turning on the third switching device, and disconnecting the electrical switching device while turning on the first and second switching devices.

[0098] 3) The control device of the control circuit of the power supply system of the present application controls the third switch device to be turned on when the charging chip enters the standby state via the first control unit; after the third switch device has been turned on for a first predetermined time, the first and second switch devices are turned off via the second control unit; when the charging chip enters the charge / discharge state, the first and second switch devices are turned on via the third control unit; after the first and second switch devices have been turned on for a second predetermined time, the third switch device is turned off via the fourth control unit. The device of the present application first turns on the third switch device when the charging chip is in the standby state, and then turns off the first and second switch devices after the first predetermined time. This ensures that current does not flow through the charging chip, thereby ensuring that the charging chip does not consume power in the standby state and that the product has low standby power consumption. When the charging chip is in the charge / discharge state, the first and second switch devices are turned on, and the third switch device is turned off after the second predetermined time, ensuring that product operation is not affected. At the same time, the device avoids system bugs caused by disconnecting the first and second switching devices while turning on the third switching device, and disconnecting the electrical switching device while turning on the first and second switching devices.

[0099] 4) In the control system of the present application, by executing any one of the control methods of the above-mentioned power supply system through the controller, when the above-mentioned charging chip is in the standby state, it can be ensured that the current does not flow through the above-mentioned charging chip, thereby ensuring that the above-mentioned charging chip does not generate power consumption in the standby state, and ensuring that the standby power consumption of the product is low; when the above-mentioned charging chip is in the charging and discharging state, it is ensured that the product operation is not affected. At the same time, it can avoid the system bug caused by disconnecting the first switching device and the second switching device while turning on the third switching device, and disconnecting the above-mentioned electrical switching device while turning on the above-mentioned first switching device and the above-mentioned second switching device, thereby ensuring that the standby power consumption of the control system is low and the stability is good.

[0100] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A control circuit for a power supply system, the power supply system comprising a battery unit, a charging chip, and a load connected in series, characterized in that: The control circuit comprises: a first switch device, wherein a first end of the first switch device is electrically connected to the battery unit, and a second end of the first switch device is electrically connected to the first end of the charging chip; a second switch device, wherein a first end of the second switch device is electrically connected to a second end of the charging chip, and a second end of the second switch device is electrically connected to the load; a third switching device, wherein a first end of the third switching device is electrically connected to the first end of the first switching device, and a second end of the third switching device is electrically connected to the second end of the second switching device; The first switching device includes a first switching device, a second switching device, and a third switching device. The first switching device, the second switching device, and the third switching device are all MOS transistors. The source of the first switching device is electrically connected to the battery cell, the drain of the first switching device is electrically connected to the charging chip, the gate of the first switching device is electrically connected to the drain of the second switching device, the source of the second switching device is electrically connected to the battery cell through a first resistor, the gate of the second switching device is electrically connected to the drain of the third switching device, and the gate of the second switching device and the drain of the third switching device are electrically connected to the battery cell through a second resistor and a first resistor respectively. The source of the third switching device is grounded, and the gate of the third switching device is electrically connected to the controller. When it is detected that the charging chip enters the standby state, the third switching device is controlled to be turned on; after the third switching device is turned on for a first predetermined period of time, the first switching device and the second switching device are controlled to be turned off; when it is detected that the charging chip enters the charging and discharging state, the first switching device and the second switching device are controlled to be turned on; after the first switching device and the second switching device are turned on for a second predetermined period of time, the third switching device is controlled to be turned off.

2. The control circuit of the power supply system according to claim 1, characterized in that: The second switching device includes: a fourth switching device comprising three terminals, a first terminal of the fourth switching device being electrically connected to the battery cell, a second terminal of the fourth switching device being the first terminal of the second switching device, and a third terminal of the fourth switching device being the second terminal of the second switching device; The fifth switching device includes three terminals, a first terminal of the fifth switching device is electrically connected to the first terminal of the fourth switching device, a second terminal of the fifth switching device is grounded, and a third terminal of the fifth switching device is used to be electrically connected to the controller.

3. The control circuit of the power supply system according to claim 1, characterized in that: The third switch device includes: a sixth switching device comprising three terminals, a first terminal of the sixth switching device being electrically connected to the first terminal of the first switching device; a seventh switching device comprising three terminals, a first end of the seventh switching device being electrically connected to the second end of the sixth switching device, and a second end of the seventh switching device being electrically connected to the second end of the second switching device; The eighth switching device includes three terminals, the first end of the eighth switching device is electrically connected to the third end of the sixth switching device and the third end of the seventh switching device respectively, the second end of the eighth switching device is grounded, and the third end of the eighth switching device is used to be electrically connected to the controller.

4. The control circuit of the power supply system according to claim 3, characterized in that: The sixth switching device and the seventh switching device are both MOS tubes. The source of the sixth switching device is electrically connected to the source of the seventh switching device, the drain of the sixth switching device is electrically connected to the first end of the first switching device, the drain of the seventh switching device is electrically connected to the second end of the second switching device, the gate of the sixth switching device and the gate of the seventh switching device are respectively electrically connected to the first end of the eighth switching device, or the drain of the sixth switching device is electrically connected to the drain of the seventh switching device, the source of the sixth switching device is electrically connected to the first end of the first switching device, the source of the seventh switching device is electrically connected to the second end of the second switching device, and the gate of the sixth switching device and the gate of the seventh switching device are respectively electrically connected to the first end of the eighth switching device.

5. The control circuit according to claim 1, wherein: After the third switch device is turned on for a first predetermined time, controlling the first switch device and the second switch device to be turned off includes: After the third switching device is turned on for the first predetermined time, controlling one of the first switching device and the second switching device to be turned off; After one of the first switching device and the second switching device is disconnected for a third predetermined time, controlling the other of the first switching device and the second switching device to be disconnected, When detecting that the charging chip enters a charging and discharging state, controlling the first switching device and the second switching device to be turned on includes: When detecting that the charging chip enters the charging and discharging state, controlling one of the first switching device and the second switching device to be turned on; After one of the first switching device and the second switching device is turned on for a fourth predetermined time period, the other of the first switching device and the second switching device is controlled to be turned on.

6. The control circuit according to claim 1 or 5, characterized in that: Controlling the first switching device to be turned on or off includes: The first predetermined level signal is controlled to be input to the third terminal of the third switching device, so that the third switching device is turned on or off, so that the second switching device and the first switching device are turned on or off in sequence.

7. The control circuit according to claim 2, characterized in that: Controlling the second switching device to be turned on or off includes: The second predetermined level signal is controlled to be input to the third terminal of the fifth switching device so that the fifth switching device is turned on or off, thereby turning on or off the fourth switching device.

8. The control circuit according to claim 3, characterized in that: Controlling the third switching device to be turned on or off includes: A third predetermined level signal is controlled to be input to the third terminal of the eighth switching device, so that the eighth switching device is turned on or off, thereby turning on or off the sixth switching device and the seventh switching device.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein: The program executes the control circuit according to any one of claims 1 to 8.

10. A control system, characterized in that: include: A power supply system, comprising a battery unit, a charging chip and a load connected in series; The control circuit of the power supply system according to any one of claims 1 to 8; A controller for executing the control circuit according to any one of claims 1 to 8.

Images