Charging device and charging equipment

Abstract

The invention discloses a charging device and charging equipment, the charging device comprises a first switch unit, a charging chip unit and a control unit, the first switch unit is respectively connected with an external power supply, the charging chip unit and the control unit, and the charging chip unit and the control unit are respectively connected with a rechargeable battery; the first switch unit is used for being in a conducting state with the control unit based on the voltage of an external power supply; the control unit is used for detecting the electric quantity of the rechargeable battery after being charged by using an external power supply, and sending different control signals to the first switch unit according to different electric quantities of the rechargeable battery; the first switch unit is also used for being in a conduction or disconnection state with the charging chip unit according to different control signals; the charging chip unit is used for charging the rechargeable battery by using an external power supply when the charging chip unit and the first switch unit are in a conducting state; and when the first switch unit is in the turn-off state, charging of the rechargeable battery is cut off, and protection of the rechargeable battery is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery charging, in particular to a charging device and a charging equipment. BACKGROUND

[0002] With the popularity of electronic products, users use electronic products more and more frequently. For electronic products with removable batteries, high-temperature storage, overcharging, constant voltage (CV) floating charging and long-time high-voltage storage leading to battery bulging are often encountered during charging of the removable batteries.

[0003] Taking a lithium ion charging battery as an example, in the charging and discharging process of the lithium ion charging battery, mainly relies on the movement of lithium ions embedding and de-embedding between the positive electrode and the negative electrode to work. Specifically, lithium ions de-embed from the positive electrode, embed into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state, which can realize the charging process of the lithium battery. However, the lithium battery is easily affected by temperature and voltage during charging. Generally speaking, the higher the temperature and the higher the voltage, the more unstable the lithium battery.

[0004] The existing charging chip is usually used to charge the lithium battery, and the charging chip controls the constant current and constant voltage charging mode of the lithium battery, but the long-time high-voltage charging situation cannot be effectively solved. SUMMARY

[0005] The charging device and the charging equipment provided by the embodiments of the present application can control the charging of the charging battery according to the power situation of the charging battery, so as to avoid the battery bulging caused by long-time charging after the charging battery is fully charged.

[0006] In a first aspect, the embodiments of the present application provide a charging device, comprising: a first switching unit, a charging chip unit and a control unit, the first switching unit is connected with an external power supply, the charging chip unit and the control unit respectively, the charging chip unit and the control unit are also connected with a charging battery respectively;

[0007] The first switching unit is used for being in a conduction state with the control unit based on the voltage of the external power supply;

[0008] The control unit is used for detecting the power of the charging battery after charging by using the external power supply, and sending different control signals to the first switching unit according to different powers of the charging battery;

[0009] The first switching unit is also used for being in a conduction or disconnection state with the charging chip unit according to different control signals;

[0010] The charging chip unit is configured to charge the charging battery by using the external power supply when the first switch unit is in the on state, and to disconnect the charging of the charging battery when the first switch unit is in the off state.

[0011] Compared with the prior art, the application sets the connection relationship among the first switch unit, the charging chip unit and the control unit, detects the power of the charging battery by using the control unit in real time, and sends a control signal to the first switch unit by the control unit when the power of the charging battery is full and the user does not take away the charging battery for a long time, so that the first switch unit is in the off state with the charging chip unit according to the control signal, and the charging of the charging battery can be disconnected in time, thereby avoiding the charging of the charging battery for a long time and causing the charging battery to swell.

[0012] As an optional implementation, the first switch unit comprises a first switch subunit and a second switch subunit.

[0013] The first switch subunit is connected with the external power supply, the control unit and the charging chip unit respectively, and the second switch subunit is connected with the external power supply and the control unit respectively.

[0014] The second switch subunit is configured to be in the on state with the control unit based on the voltage of the external power supply.

[0015] The control unit is specifically configured to send a first control signal to the first switch subunit when the power of the charging battery is less than a first preset value after charging by using the external power supply, or send a second control signal to the first switch subunit when the power of the charging battery is equal to the first preset value and the power of the charging battery is continuously detected within a first preset time length.

[0016] The first switch subunit is configured to be in the on state with the charging chip unit after receiving the first control signal, or be in the off state with the charging chip unit after receiving the second control signal.

[0017] The application sets that the first switch unit comprises a first switch subunit and a second switch subunit, and sets the connection relationship of the first switch subunit and the second switch subunit with the charging chip unit and the control unit, and accurately controls the charging of the charging battery according to two different control paths of the control unit-second switch subunit-external power supply and the control unit-first switch subunit-external power supply-charging chip unit.

[0018] As an optional implementation, the charging device further comprises a second switch unit; the second switch unit is connected with the control unit and the charging battery respectively;

[0019] The control unit is further configured to, if the power of the charging battery is continuously detected for a second preset time period, send a third control signal to the second switch sub-unit and a fourth control signal to the second switch unit; and the second preset time period is longer than the first preset time period.

[0020] The second switch sub-unit is configured to, after receiving the third control signal, be in a disconnected state with the control unit.

[0021] The second switch unit is configured to, after receiving the fourth control signal, be in a conductive state with the control unit, so as to charge the control unit by using the charging battery.

[0022] The charging device further comprises a second switch unit, and the connection relationship between the second switch unit, the control unit and the charging battery is set, so that the charging of the charging battery is disconnected when the charging battery is not taken away for a long time, the external power supply is disconnected to charge the control unit, the charging battery is used to charge the control unit, a faster discharge path is provided for the charging battery, the charging battery is prevented from being always in a high power state, the charging battery is prevented from being damaged due to gas expansion, and the charging battery is better protected.

[0023] As an optional implementation, the charging device further comprises a voltage selection unit; the voltage selection unit is connected with the second switch sub-unit, the second switch unit and the control unit respectively;

[0024] The voltage selection unit is configured to select the external power supply or the charging battery to charge the control unit based on the second switch sub-unit and the second switch unit being in a conductive or disconnected state respectively.

[0025] The charging device further comprises a voltage selection unit, and the connection relationship between the voltage selection unit, the second switch sub-unit, the second switch unit and the control unit is set, so that the external power supply or the charging battery is accurately selected to charge the control unit, simple connection is set, and the purpose of accurately controlling the charging of the charging battery is achieved.

[0026] As an optional implementation, the charging device further comprises a voltage selection unit; the voltage selection unit is connected with the second switch sub-unit, the second switch unit and the control unit respectively;

[0027] The voltage selection unit is configured to select the external power supply or the charging battery to charge the control unit based on the second switch sub-unit and the second switch unit being in a conductive or disconnected state respectively.

[0028] This application includes a step-down unit in the charging device, and sets the position and connection relationship of the step-down unit in the charging device, so that the external power supply or charging battery can be stepped down first, and then the control unit can be charged, thereby achieving the purpose of voltage stabilization.

[0029] As an optional implementation, the control unit is further configured to: if the charge level of the rechargeable battery after discharge is less than a second preset value, send a fifth control signal to the second switch subunit and send a sixth control signal to the second switch unit; wherein the second preset value is less than the first preset value;

[0030] The second switch subunit is also used to receive the fifth control signal and be in a conducting state with the control unit so as to charge the control unit using the external power supply;

[0031] The second switching unit is also used to receive the sixth control signal and be in a disconnected state from the control unit to disconnect the charging battery from charging the control unit.

[0032] This application uses a control unit to monitor the charge level of the rechargeable battery in real time. Even if the rechargeable battery has not been removed for a long time and the control unit has been charged to achieve rapid discharge, the charging of the control unit can be disconnected in time to ensure that the rechargeable battery maintains a normal charge level. This allows the rechargeable battery to either continuously maintain a high charge level through discharge or to maintain a normal charge level by stopping the charging of the control unit in time, thus achieving the purpose of protecting the rechargeable battery.

[0033] As an optional implementation, the control unit is further configured to: if the charge level of the rechargeable battery after discharge is less than a third preset value, then send the first control signal to the first switch subunit; wherein the third preset value is less than the second preset value;

[0034] The first switch subunit is further configured to, upon receiving the first control signal, be in a conducting state with the charging chip unit, so as to charge the rechargeable battery using the charging chip through the external power supply.

[0035] This application features a system that, when the rechargeable battery remains in place and is undergoing self-discharge, uses a control unit to monitor the battery's charge level in real time. If the charge level falls below a third preset value, an external power source is used to recharge the battery, preventing it from becoming too low and over-discharged, thus protecting the battery. Simultaneously, this system ensures a better user experience by preventing short battery life due to low charge when the battery is removed.

[0036] As an optional implementation, the first switching subunit includes devices with low-pass characteristics, and the second switching subunit includes devices with high-pass characteristics. By setting the relationship between the devices included in the first and second switching subunits, the charging of the rechargeable battery can be accurately controlled according to the first and second switching subunits.

[0037] As an optional implementation, the voltage selection unit includes a first diode and a second diode, with the cathodes of the first diode and the second diode respectively connected to the control unit; the anode of the first diode is connected to the second switching subunit, and the anode of the second diode is connected to the second switching subunit. By setting the connection relationship of the components included in the voltage selection unit, the charging of the control unit can be accurately controlled according to the first diode and the second diode.

[0038] Secondly, embodiments of this application provide a charging device, including: a charging apparatus as described in any of the first aspects above, an external power source, and a rechargeable battery; the charging apparatus is connected to the external power source and the rechargeable battery respectively.

[0039] The technical effects of any implementation method in the second aspect can be found in the technical effects of the corresponding implementation method in the first aspect, and will not be repeated here. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the structure of the voltage selection unit provided in the embodiments of this application;

[0043] Figure 4 This is a schematic diagram of the charging method provided in an embodiment of this application. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0045] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data used can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] With the increasing popularity of electronic products, users are using them more and more frequently. For electronic products with removable batteries, when charging the removable batteries, it is common to encounter problems such as high temperature storage, overcharging, CV float charging, and prolonged high voltage storage, which can cause the batteries to bulge.

[0047] Taking lithium-ion rechargeable batteries as an example, during charging and discharging, lithium-ion rechargeable batteries mainly rely on the movement of lithium ions between the positive and negative electrodes, intercalating and deintercalating. Specifically, lithium ions deintercalate from the positive electrode, pass through the electrolyte, and intercalate into the negative electrode, leaving the negative electrode in a lithium-rich state. This process enables the charging of the lithium battery. However, lithium batteries are easily affected by temperature and voltage during charging. Generally speaking, the higher the temperature and voltage, the more unstable the lithium battery becomes.

[0048] The current method typically uses a charging chip to charge lithium batteries, which controls the constant current and constant voltage charging of the lithium battery. However, this method cannot effectively solve the problem of long-term high-voltage charging.

[0049] Therefore, this application provides a charging device and charging equipment. By setting the connection relationship between the first switch unit, the charging chip unit and the control unit, the control unit detects the charge level of the charging battery in real time. So that when the charging battery is fully charged and the user does not remove the charging battery for a long time, the control unit sends a control signal to the first switch unit. The first switch unit is disconnected from the charging chip unit according to the control signal, so that the charging of the charging battery can be disconnected in time, avoiding the charging of the charging battery for a long time and causing the charging battery to bulge.

[0050] After introducing the design concept of the embodiments of this application, in order to further illustrate the technical solutions provided by the embodiments of this application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiments of this application provide method operation steps as shown in the following embodiments or drawings, the method may include more or fewer operation steps based on conventional or non-creative labor. In steps where there is no logically necessary causal relationship, the execution order of these steps is not limited to the execution order provided by the embodiments of this application.

[0051] like Figure 1 The diagram shows a schematic of a charging device. The charging device includes a first switch unit 101, a charging chip unit 102, and a control unit 103. The first switch unit 101 is connected to an external power supply 104, the charging chip unit 102, and the control unit 103, respectively. The charging chip unit 102 and the control unit 103 are also connected to a rechargeable battery 105, respectively.

[0052] In the specific implementation process, based on the voltage of the external power supply 104, the first switching unit 101 and the control unit 103 are in a conducting state, so the external power supply 104 can charge the control unit 103. Then, the control unit 103 detects the charge level of the rechargeable battery 105 and sends different control signals to the first switching unit 101 according to the different charge levels of the rechargeable battery 105. After receiving different control signals, the first switching unit 101 is in a conducting or disconnected state with the charging chip unit 102 according to the different control signals. Finally, when the charging chip unit 102 is in a conducting state with the first switching unit 101, it uses the external power supply 104 to charge the rechargeable battery 105; when it is in a disconnected state with the first switching unit 101, it disconnects the charging of the rechargeable battery 105.

[0053] Furthermore, such as Figure 2 As shown, the first switch unit 101 includes a first switch subunit 101-1 and a second switch subunit 101-2. The first switch subunit 101-1 is connected to the external power supply 104, the control unit 103 and the charging chip unit 102 respectively, and the second switch subunit 101-2 is connected to the external power supply 104 and the control unit 103 respectively.

[0054] Based on the voltage of the external power supply 104, the second switch subunit 101-2 and the control unit 103 are in a conducting state, allowing the external power supply 104 to charge the control unit 103. Then, the control unit 103 detects that the charge level of the rechargeable battery 105 is less than a first preset value, and sends a first control signal A1 to the first switch subunit 101-1. Upon receiving the first control signal A1, the first switch subunit 101-1 is in a conducting state with the charging chip unit 102, allowing the external power supply 104 to charge the rechargeable battery 105 through the charging chip unit 102. If the control unit 103 detects that the charge level of the rechargeable battery 105 is equal to the first preset value, and continues to detect the charge level of the rechargeable battery 105 for a first preset duration, it sends a second control signal A2 to the first switch subunit 101-1. Upon receiving the second control signal A2, the first switch subunit 101-1 is in a disconnected state with the charging chip unit 102, thus disconnecting the external power supply 104 from charging the rechargeable battery 105 through the charging chip unit 102.

[0055] For example, the first switching subunit 101-1 may contain a low-pass device, and the second switching subunit 101-2 may contain a high-pass device. For instance, the first switching subunit 101-1 may contain a P-type metal-oxide-semiconductor (MOS) semiconductor, and the second switching subunit 101-2 may contain an N-type MOS semiconductor. The charging chip unit 102 may contain a charging integrated circuit (referred to as a Charger IC). The control unit 103 may contain a microcontroller (referred to as a Microcontroller Unit). The rechargeable battery 105 may be a lithium battery.

[0056] Optionally, assuming the first preset value is 100% and the first preset duration is 2 days, if the control unit 103 detects that the charge level of the rechargeable battery 105 is less than 100%, it sends a first control signal A1 to the first switch subunit 101-1 to enable the external power supply 104 to charge the rechargeable battery 105 through the charging chip unit 102 until the charge level reaches 100%. If the user has not removed the rechargeable battery 105 within 2 days, to prevent the rechargeable battery 105 from remaining in a high charge state, the control unit 103 sends a second control signal A2 to the first switch subunit 101-1 to disconnect the external power supply 104 from charging the rechargeable battery 105 through the charging chip unit 102.

[0057] It should be understood that this is merely an example illustrating the components included in each of the first switch subunit 101-1, the second switch subunit 101-2, the charging chip unit 102, and the control unit 103. This application does not limit the specific components included in each of the first switch subunit 101-1, the second switch subunit 101-2, the charging chip unit 102, and the control unit 103, nor does it limit the number of components included in each unit. These can be adjusted according to the actual situation.

[0058] In one embodiment of this application, as Figure 2 As shown, the charging device may further include: a second switch unit 106; the second switch unit 106 is connected to the control unit 103 and the rechargeable battery 105 respectively.

[0059] If the control unit 103 continuously detects the charge level of the rechargeable battery 105 within the second preset time period, it sends a third control signal A3 to the second switch subunit 101-2 and a fourth control signal A4 to the second switch unit 106. After receiving the third control signal A3, the second switch subunit 101-2 is disconnected from the control unit 103, and after receiving the fourth control signal A4, the second switch unit 106 is connected to the control unit 103. In this way, the rechargeable battery 105 can be used to charge the control unit 103.

[0060] For example, suppose the second preset duration is 7 days, that is, if the user does not remove the rechargeable battery 105 within 7 days after the battery reaches 100% charge, although the control unit 103 will stop charging the rechargeable battery 105 when it detects that the rechargeable battery 105 has not been removed within 2 days, the rechargeable battery 105 is always in a high charge state and is still prone to bulging. Therefore, a second switch unit 106 is set up to charge the control unit 103 using the rechargeable battery 105, thereby achieving rapid discharge of the rechargeable battery 105 and protecting the rechargeable battery 105.

[0061] It should be understood that the devices included in the second switching unit 106 can also be high-pass devices. For example, it can include an N-type metal-oxide-semiconductor. Similarly, this is only an example to illustrate the devices included in the second switching unit 106. This application does not limit the specific devices included in the second switching unit 106, nor does it limit the number of devices included in the second switching unit 106. It can be adjusted according to the actual situation.

[0062] Optionally, if the rechargeable battery 105 has a built-in fuel gauge, the fourth control signal A4 between the control unit 103 and the rechargeable battery 105 can be an I2C bus control signal, through which the control unit 103 acquires the power of the rechargeable battery 105; if the rechargeable battery 105 does not have a built-in fuel gauge, the fourth control signal A4 between the control unit 103 and the rechargeable battery 105 can be an ADC acquisition bus control signal, through which the control unit 103 acquires the voltage information of the rechargeable battery 105, and then converts the voltage information into the corresponding power.

[0063] In one embodiment of this application, as Figure 2As shown, the charging device may further include: a voltage selection unit 107; the voltage selection unit 107 is connected to the second switch subunit 101-2, the second switch unit 106 and the control unit 103 respectively.

[0064] Based on the fact that the second switch subunit 101-2 and the second switch unit 106 are respectively in the on or off state, the voltage selection unit 107 selects the external power supply 104 or the rechargeable battery 105 to charge the control unit 103.

[0065] In the specific implementation process, such as Figure 3 As shown, the voltage selection unit 107 may include a first diode 107-1 and a second diode 107-2. The cathodes of the first diode 107-1 and the second diode 107-2 are respectively connected to the control unit 103. The anode of the first diode 107-1 is connected to the second switch subunit 101-2, and the anode of the second diode 107-2 is connected to the second switch unit 106.

[0066] Based on the above embodiments, if the second switch subunit 101-2 receives the third control signal A3 and is disconnected from the control unit 103, and the second switch unit 106 receives the fourth control signal A4 and is connected to the control unit 103, then the first diode 107-1 is disconnected and the second diode 107-2 is connected. In this way, the rechargeable battery 105 charges the control unit 103 through the second switch unit 106 and the second diode 107-2.

[0067] Optionally, the charging device may further include a step-down unit 108; the step-down unit 108 is connected to the voltage selection unit 107 and the control unit 103 respectively. The step-down unit 108 can step down the voltage of the external power supply 104 or the voltage of the rechargeable battery 105.

[0068] For example, when the rechargeable battery 105 is a lithium battery, assuming the output voltage of the lithium battery is 4.35V, the charging voltage of the control unit 103 is 3.3V, and the output voltage of the external power supply 104 is 5V, then when the rechargeable battery 105 charges the control unit 103 through the second switching unit 106 and the second diode 107-2, the output voltage of the lithium battery (4.35V) can first be stepped down to 3.3V by the step-down unit 108 before charging the control unit 103. Alternatively, when the external power supply 104 charges the control unit 103 through the second switching subunit 101-2 and the first diode 107-1, the output voltage of the external power supply 104 (5V) can first be stepped down to 3.3V by the step-down unit 108 before charging the control unit 103.

[0069] In one embodiment of this application, after the rechargeable battery 105 charges the control unit 103, if the control unit 103 detects that the discharged charge of the rechargeable battery 105 is less than a second preset value, it sends a fifth control signal A5 to the second switch subunit 101-2 and a sixth control signal A6 to the second switch unit 106. Upon receiving the fifth control signal A5, the second switch subunit 101-2 is in a conducting state with the control unit 103 to charge the control unit 103 using an external power supply 104. Upon receiving the sixth control signal A6, the second switch unit 106 is in a disconnected state with the control unit 103 to disconnect the rechargeable battery 105 from charging the control unit 103. The second preset value is less than the first preset value.

[0070] For example, assuming the second preset value is 60%, since the charge of the rechargeable battery 105 is 100% and the user has not removed the rechargeable battery 105 within 7 days, after the rechargeable battery 105 charges the control unit 103, the control unit 103 detects the charge of the rechargeable battery 105 in real time. When the charge of the rechargeable battery 105 reaches 60%, the charging of the control unit 103 by the rechargeable battery 105 is stopped to ensure that the rechargeable battery 105 enters the cell self-discharge state.

[0071] If the control unit 103 detects that the charge level of the rechargeable battery 105 after discharge is less than a third preset value, it sends a first control signal A1 to the first switch subunit 101-1. After receiving the first control signal A1, the first switch subunit 101-1 is in a conducting state with the charging chip unit 102, so as to charge the rechargeable battery 105 through the external power supply 104 using the charging chip. The third preset value is less than the second preset value.

[0072] For example, assuming the third preset value is 40%, after the rechargeable battery 105 enters the cell self-discharge state, the charge of the rechargeable battery 105 drops from 60% to 40%. Therefore, the rechargeable battery 105 is recharged to prevent the battery from becoming too low and causing over-discharge, thus protecting the battery. At the same time, this ensures a better user experience when using the rechargeable battery, preventing short battery life due to low charge when the battery is removed.

[0073] In one embodiment of this application, as Figure 4 As shown, assuming the control unit 103 is an MCU and the charging chip unit 102 is a Chaeger IC, the overall process for charging the rechargeable battery can be described in the following steps:

[0074] The MCU operates by monitoring whether the rechargeable battery is inserted. If not, it continues monitoring; if so, it enables the first switch subunit to charge the battery. During this time, the MCU monitors the battery's charge level. If the battery is not fully charged, it continues charging; if fully charged, the Charger IC stops charging, and the MCU starts timing. The user can then remove the battery, ending charging and the MCU timing, ready to wait for the next battery insertion.

[0075] If the rechargeable battery remains in use, the MCU continues timing. If the user removes the battery within two days, charging ends, and the MCU timing stops. During these two days, the Charger IC manages the charging process, meaning the battery cells self-discharge, and the Charger IC replenishes the battery to maintain 100% charge. If the user does not remove the battery after two days, the MCU disconnects from the first switching subunit, stopping charging, but the MCU continues timing. For the next seven days, the MCU continues disconnecting from the first switching subunit and stopping charging, while the MCU continues timing. During these seven days, the self-discharge from the battery cells is minimal, allowing the user to remove the battery at any time.

[0076] If the user does not remove the rechargeable battery after 7 days, the MCU disconnects from the second switch subunit and reconnects to it, allowing the rechargeable battery to charge the MCU, which continuously monitors the battery level. When the battery level is above 60%, it continues to charge the MCU. When the battery level drops below 60%, the MCU reconnects to the second switch subunit, disconnects it, and the battery enters long-cycle storage. The MCU's timing ends, and it resumes monitoring the battery level.

[0077] When the battery level is above 40%, the battery maintains a self-discharge mode. When the battery level is below 40%, the MCU resumes charging the battery.

[0078] In one embodiment of this application, a charging device is also provided, comprising: a charging device as described in any of the above embodiments, an external power supply, and a rechargeable battery, wherein the charging device is connected to the external power supply and the rechargeable battery respectively.

[0079] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0080] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A charging device, characterized in that, include: The system comprises a first switching unit, a charging chip unit, and a control unit. The first switching unit is connected to an external power supply, the charging chip unit, and the control unit, respectively. The charging chip unit and the control unit are also connected to a rechargeable battery, respectively. The first switching unit is configured to be in a conducting state with the control unit based on the voltage of the external power supply; The control unit is used to detect the charge level of the rechargeable battery after charging with the external power source, and send different control signals to the first switching unit according to the different charge levels of the rechargeable battery. The first switching unit is also used to be in an on or off state with the charging chip unit according to different control signals; The charging chip unit is used to charge the rechargeable battery using the external power supply when it is in a conducting state with the first switch unit; and to disconnect the charging of the rechargeable battery when it is in a de-conducting state with the first switch unit.

2. The charging device as described in claim 1, characterized in that, The first switching unit includes: a first switching subunit and a second switching subunit; The first switch subunit is connected to the external power supply, the control unit, and the charging chip unit, respectively; the second switch subunit is connected to the external power supply and the control unit, respectively. The second switching subunit is used to be in a conducting state with the control unit based on the voltage of the external power supply; The control unit is specifically configured to send a first control signal to the first switch subunit if it detects that the charge level of the rechargeable battery is less than a first preset value after charging with the external power source; or, if it detects that the charge level of the rechargeable battery is equal to the first preset value and continuously detects the charge level of the rechargeable battery for a first preset duration, it sends a second control signal to the first switch subunit. The first switch subunit is configured to be in a conducting state with the charging chip unit after receiving the first control signal; or to be in a disconnected state with the charging chip unit after receiving the second control signal.

3. The charging device as described in claim 2, characterized in that, The charging device further includes: a second switching unit; the second switching unit is connected to the control unit and the rechargeable battery respectively; The control unit is further configured to continuously detect the charge level of the rechargeable battery within a second preset duration, and then send a third control signal to the second switch subunit and a fourth control signal to the second switch unit; wherein the second preset duration is longer than the first preset duration; The second switch subunit is also used to receive the third control signal and to be disconnected from the control unit; The second switching unit is used to receive the fourth control signal and be in a conducting state with the control unit so as to charge the control unit using the rechargeable battery.

4. The charging device as described in claim 3, characterized in that, The charging device further includes: a voltage selection unit; the voltage selection unit is connected to the second switch subunit, the second switch unit, and the control unit respectively; The voltage selection unit is used to select the external power supply or the rechargeable battery to charge the control unit based on whether the second switch subunit and the second switch unit are in the on or off state, respectively.

5. The charging device as described in claim 4, characterized in that, The charging device further includes: a step-down unit; the step-down unit is connected to both the voltage selection unit and the control unit; The step-down unit is used to step down the voltage of the external power supply or the voltage of the rechargeable battery.

6. The charging device as described in claim 3, characterized in that, The control unit is further configured to: if the charge level of the rechargeable battery after discharge is less than a second preset value, send a fifth control signal to the second switch subunit and send a sixth control signal to the second switch unit; wherein the second preset value is less than the first preset value; The second switch subunit is also used to receive the fifth control signal and be in a conducting state with the control unit so as to charge the control unit using the external power supply; The second switching unit is also used to receive the sixth control signal and be in a disconnected state from the control unit to disconnect the charging battery from charging the control unit.

7. The charging device as described in claim 6, characterized in that, The control unit is further configured to: if the charge level of the rechargeable battery after discharge is less than a third preset value, send the first control signal to the first switch subunit; wherein the third preset value is less than the second preset value; The first switch subunit is further configured to, upon receiving the first control signal, be in a conducting state with the charging chip unit, so as to charge the rechargeable battery using the charging chip through the external power supply.

8. The charging device as described in claim 2, characterized in that, The first switching subunit contains devices with low-pass characteristics, and the second switching subunit contains devices with high-pass characteristics.

9. The charging device as claimed in claim 4, characterized in that, The voltage selection unit includes a first diode and a second diode, the cathodes of the first diode and the second diode are respectively connected to the control unit; the anode of the first diode is connected to the second switching subunit, and the anode of the second diode is connected to the second switching unit.

10. A charging device, characterized in that, include: The charging device, external power supply, and rechargeable battery as described in any one of claims 1-9; The charging device is connected to the external power source and the rechargeable battery, respectively.

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