Seat charger device

Abstract

The utility model relates to the technical field of circuit design, in particular to a seat charger device, which is characterized in that a first end of a primary seat charger circuit is connected with an external power supply, and a second end is connected with an input end of a power management chip; the first end and the second end of the optocoupler are respectively bridged between the electric input end of the power supply management chip and the output end of the primary seat charging circuit; the first end of the over-temperature protection capacitor is connected with the first end of the optocoupler, and the second end of the over-temperature protection capacitor is grounded; the first end of the over-temperature protection resistor is connected with the second end of the optocoupler and the first end of the load lithium battery, and the second end of the over-temperature protection resistor is connected with the second end of the load lithium battery. According to the device, the first end and the second end of the optocoupler are respectively bridged between the electric input end of the power management chip and the output end of the primary seat charging circuit, so that when the temperature of the load lithium battery rises, the power management chip can be disconnected to cut off the output of the seat charging device; and potential safety hazards caused by continuous charging of the lithium battery in a high-temperature state are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circuit design, specifically relates to a seat charging device in the technical field of circuit design. BACKGROUND

[0002] In the related art, the current product needs to charge a plurality of series connected lithium batteries, and as the plurality of series connected lithium batteries are popular in household appliances, high requirements are put forward for the safe charging temperature of the lithium battery, and the function of over-temperature detection and output cut-off needs to be added to the seat charging product; in the related art, a single-chip microcomputer is selected to detect the seat charging temperature, and then a control signal is sent to cut off the output; in this way, the design of the seat charging device is relatively complex, and the design cost is relatively high. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a seat charging device, and the technical scheme is as follows:

[0004] The utility model embodiment provides a seat charging device, and the seat charging device comprises:

[0005] A power management chip, a primary seat charging circuit, an optocoupler, an over-temperature protection resistor and an over-temperature protection capacitor; wherein:

[0006] The first end of the primary seat charging circuit is connected to an external power supply, and the second end is connected to the input end of the power management chip; the first end and the second end of the optocoupler are respectively connected between the power input end of the power management chip and the output end of the primary seat charging circuit; the first end of the over-temperature protection capacitor is connected to the first end of the optocoupler, and the second end of the over-temperature protection capacitor is grounded; the first end of the over-temperature protection resistor is connected to the second end of the optocoupler and the first end of a load lithium battery respectively, and the second end of the over-temperature protection resistor is connected to the second end of the load lithium battery.

[0007] In some possible implementation manners, the load lithium battery comprises a negative temperature coefficient thermistor; when the load lithium battery is inserted into the seat charging device, the thermistor is connected in parallel with the over-temperature protection resistor.

[0008] In some possible implementation manners, the resistance value of the over-temperature protection resistor is greater than a preset resistance value.

[0009] In some possible implementation manners, the primary seat charging circuit comprises a first filter circuit, a voltage rectifier circuit, a voltage and current absorption circuit, a starting power supply circuit, an over-current protection circuit, a voltage feedback circuit, a voltage power supply circuit, a transformer and a second filter circuit; wherein:

[0010] The first end of the first filter circuit is connected to the external power supply, and the second end is connected to the first end of the voltage rectifier circuit; the first end of the transformer is connected to the output end of the power management chip, the second end of the transformer is connected to the first end of the second filter circuit, and the second end of the second filter circuit is the output end of the primary charging circuit; the second end of the voltage rectifier circuit is connected to the first end of the starting power supply circuit and the first end of the voltage and current absorption circuit respectively; the second end of the voltage and current absorption circuit is connected to the output end of the power management chip and the first end of the transformer respectively; the second end of the starting power supply circuit is connected to the input end of the power management chip; the third end of the starting power supply circuit is connected to the first end of the voltage power supply circuit, and the second end of the voltage power supply circuit is connected to the first end of the voltage feedback loop; the second end of the voltage feedback loop is connected to the first end of the overcurrent protection loop, and the second end of the overcurrent protection loop is connected to the power management chip.

[0011] In some possible implementation manners, the first filter circuit comprises a fuse, a pressure-sensitive resistor, a common-mode inductor and a first capacitor; wherein:

[0012] One end of the fuse is connected to the external power supply, and the other end is connected to the first end of the pressure-sensitive resistor, the first end of the first capacitor and the first end of the common-mode inductor respectively; the second end of the first capacitor is connected to the second end of the common-mode inductor and the second end of the pressure-sensitive resistor respectively.

[0013] In some possible implementation manners, the second filter circuit comprises a third rectifier diode, a second capacitor and a third capacitor; wherein:

[0014] The positive electrode of the third rectifier diode is connected to the positive electrode of the transformer, the negative electrode of the third rectifier diode is connected to the first end of the second capacitor and the first end of the third capacitor respectively, and the second end of the second capacitor is connected to the second end of the third capacitor and the negative electrode of the transformer respectively.

[0015] In some possible implementation manners, the voltage rectifier circuit comprises a current bridge and a first electrolytic capacitor; wherein: the first end and the third end of the current bridge are connected to the fuse, the second end and the fourth end of the current bridge are connected to the first end and the second end of the electrolytic capacitor respectively, and the second end of the electrolytic capacitor is grounded.

[0016] In some possible implementation manners, the voltage and current absorption circuit comprises a first resistor, a second resistor, a third resistor, a fourth capacitor and a first rectifier diode; wherein:

[0017] The first end of the first resistor is connected with the second end of the second resistor, the second end of the third resistor and the second end of the fourth capacitor respectively; the first end of the second resistor is connected with the first end of the third resistor and the first end of the fourth capacitor respectively; the second end of the first resistor is connected with the negative electrode of the first rectifier diode, and the positive electrode of the first rectifier diode is connected with the power management chip.

[0018] In some possible implementation manners, the starting power supply circuit comprises a fourth resistor, a fifth resistor and a second electrolytic capacitor, wherein: the fourth resistor and the fifth resistor are connected in series, one end of the fourth resistor is connected with high voltage, and one end of the fifth resistor is connected with the second electrolytic capacitor.

[0019] The overcurrent protection circuit comprises a sixth resistor and a seventh resistor in parallel.

[0020] In some possible implementation manners, the voltage feedback circuit comprises an eighth resistor, a ninth resistor and a tenth resistor, wherein: the eighth resistor and the ninth resistor are connected in parallel and connected with the tenth resistor in series.

[0021] The voltage power supply circuit comprises a second rectifier diode, an eleventh resistor and a second electrolytic capacitor, wherein: one end of the eleventh resistor is connected with the negative electrode of the second rectifier diode, the other end of the eleventh resistor is connected with the positive electrode of the second electrolytic capacitor, the negative electrode of the second electrolytic capacitor is connected with the ground, and one end of the tenth resistor is connected with the positive electrode of the second rectifier diode.

[0022] The utility model discloses the following beneficial effects: in the seat charging device, through the first end of primary seat charging circuit access external power supply, and the input end of power management chip is connected with the second end, the first end and the second end of photocoupler are crossed between the electric input end of power management chip and the output end of primary seat charging circuit respectively, the first end of overtemperature protection capacitor is connected with the first end of photocoupler, and the second end of overtemperature protection capacitor is grounded, the first end of overtemperature protection resistance is connected with the second end of photocoupler and the first end of load lithium battery respectively, and the second end of overtemperature protection resistance is connected with the second end of load lithium battery. In this way, when the load lithium battery is inserted into the seat charging device, because the first end and the second end of photocoupler are crossed between the electric input end of power management chip and the output end of primary seat charging circuit respectively, if the temperature in the load lithium battery rises, then the voltage of the electric input end of power management chip can be pulled down, and the power management chip enters the disconnected state based on the voltage of the electric input end that is pulled down, to cut off the output of the seat charging device, to avoid the security risk caused by continuous charging of lithium battery under high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiment or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 is a schematic diagram of another component structure of the seat charging device provided by the embodiment of the present application.

[0025] Figure 2 is a schematic diagram of another component structure of the seat charging device provided by the embodiment of the present application.

[0026] Figure 3 is a schematic diagram of another component structure of the seat charging device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific implementation, structure, features and effects of the seat charging device according to the present application will be described in detail below in combination with the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0028] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0029] Hereinafter, the terms "first", "second" are only used for description purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs.

[0031] The specific scheme of the seat charging device provided by the present application will be described in detail below in combination with the drawings. Please refer to Figure 1It shows that the utility model provides a kind of seat charging device's component structure schematic diagram, the seat charging device 100, including: power management chip 101, primary seat charging circuit 102, optocoupler U1, over-temperature protection resistance R15 and over-temperature protection capacitor C3;Wherein,

[0032] The first end of the primary seat charging circuit 102 is connected to the external power supply, and the second end is connected to the input end of the power management chip 101;The first end and the second end of the optocoupler U1 are respectively connected across the input end of the power management chip 101 and the output end of the primary seat charging circuit 102;The first end of the over-temperature protection capacitor C3 is connected to the first end of the optocoupler, and the second end of the over-temperature protection capacitor C3 is grounded;The first end of the over-temperature protection resistance R15 is respectively connected to the second end of the optocoupler and the first end of the load lithium battery, and the second end of the over-temperature protection resistance is connected to the second end of the load lithium battery.

[0033] The primary seat charging circuit 102 provides a power supply voltage to the power management chip.

[0034] In some possible implementations, the primary seat charging circuit 102 includes: a primary seat charging circuit, including: a first filter circuit, a voltage rectification circuit, a voltage and current absorption circuit, a start-up power supply circuit, an over-current protection circuit, a voltage feedback circuit, a voltage power supply circuit, a transformer, and a second filter circuit;Wherein:

[0035] The first end of the first filter circuit is connected to the external power supply, and the second end is connected to the first end of the voltage rectification circuit;The first end of the transformer is connected to the output end of the power management chip, the second end of the transformer is connected to the first end of the second filter circuit, and the second end of the second filter circuit serves as the output end of the primary seat charging circuit;The second end of the voltage rectification circuit is respectively connected to the first end of the start-up power supply circuit and the first end of the voltage and current absorption circuit;The second end of the voltage and current absorption circuit is respectively connected to the output end of the power management chip and the first end of the transformer;The second end of the start-up power supply circuit is connected to the input end of the power management chip;The third end of the start-up power supply circuit is connected to the first end of the voltage power supply circuit, and the second end of the voltage power supply circuit is connected to the first end of the voltage feedback circuit;The second end of the voltage feedback circuit is connected to the first end of the over-current protection circuit, and the second end of the over-current protection circuit is connected to the power management chip.

[0036] Here, the output end of the power management chip is the PIN4 pin of the power management chip.

[0037] The first filter circuit absorbs common-mode noise of the external power supply.

[0038] Here, the first terminal of the first filter circuit serves as the first terminal of the primary charging circuit and is connected to an external power supply. The second terminal of the voltage and current control circuit serves as the second terminal of the primary charging circuit and is connected to the input terminal of the power management chip. The transformer can be... Figure 2 The transformer TR1 is shown.

[0039] In some possible implementations, the first filter circuit includes: a fuse, a varistor, a common-mode inductor, and a first capacitor; wherein: one end of the fuse is connected to an external power supply, and the other end is connected to the first end of the varistor, the first end of the first capacitor, and the first end of the common-mode inductor respectively; the second end of the first capacitor is connected to the second end of the common-mode inductor and the second end of the varistor respectively.

[0040] like Figure 2 As shown, the first filter circuit includes: fuse F1, varistor MOV1, common mode inductor LF1, and safety capacitor CX1 (i.e., the first capacitor); this first filter circuit is an electromagnetic interference filter circuit (i.e., an EMI filter circuit), which absorbs common mode noise from the external power supply and suppresses EMI common mode signal interference.

[0041] The voltage rectifier circuit converts AC voltage into DC voltage.

[0042] In some possible implementations, the voltage rectifier circuit includes: a current bridge and a first electrolytic capacitor; wherein: the first and third ends of the current bridge are connected to the fuse, the second and fourth ends are respectively connected to the first and second ends of the electrolytic capacitor, and the second end of the electrolytic capacitor is grounded.

[0043] like Figure 2 As shown, the voltage rectifier circuit includes: a rectifier bridge DB1 and an electrolytic capacitor EC1 (i.e., the first electrolytic capacitor); the rectifier bridge DB1 converts 50 Hz AC power into DC power, and then through the sufficiently large capacity EC1 electrolytic capacitor for filtering, it provides a relatively stable DC voltage to the power supply.

[0044] The voltage and current absorption circuit absorbs the voltage spikes generated by the power management chip.

[0045] In some possible implementations, the voltage and current absorption circuit includes: a first resistor, a second resistor, a third resistor, a fourth capacitor, and a first rectifier diode; wherein:

[0046] The first end of the first resistor is connected with the second end of the second resistor, the second end of the third resistor and the second end of the fourth capacitor respectively; the first end of the second resistor is connected with the first end of the third resistor and the first end of the fourth capacitor respectively; the second end of the first resistor is connected with the negative electrode of the first rectifier diode, and the positive electrode of the first rectifier diode is connected with the power management chip.

[0047] As shown in Figure 2 , the voltage current absorption circuit is an RCD absorption circuit composed of R3 (i.e. the first resistor), R4 (i.e. the second resistor), R5 (i.e. the third resistor), C1 (i.e. the fourth capacitor) and D1 (i.e. the first rectifier diode) to absorb the peak voltage generated by the leakage inductance of the transformer in the switching moment of the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) in the power management chip IC1.

[0048] The starting power supply circuit provides starting current for the power management chip based on the direct current voltage to start the power management chip.

[0049] In some possible implementation manners, the starting power supply circuit comprises a fourth resistor, a fifth resistor and a second electrolytic capacitor; wherein: the fourth resistor and the fifth resistor are connected in series, one end of the fourth resistor is connected with a high voltage, and one end of the fifth resistor is connected with the second electrolytic capacitor.

[0050] As shown in Figure 2 , the starting power supply circuit comprises a resistor R1 (i.e. the fourth resistor), a resistor R2 (i.e. the fifth resistor) and an electrolytic capacitor EC3 (i.e. the second electrolytic capacitor); the starting power supply circuit provides starting current for the main chip IC1 (i.e. the power management chip) to ensure that the system can start working smoothly.

[0051] The overcurrent protection circuit turns off the power management chip when the voltage value of the control voltage end of the power management chip rises from an initial value, and turns on the power management chip until the voltage value of the control voltage end returns to the initial value.

[0052] In some possible implementation manners, the overcurrent protection circuit comprises a sixth resistor and a seventh resistor connected in parallel. One end of the sixth resistor and the seventh resistor connected in parallel is connected with the CS pin of the power management chip.

[0053] As shown in Figure 2As shown, the current protection circuit includes: resistor R6 (i.e., the sixth resistor) and R7 (i.e., the seventh resistor); in the overcurrent protection circuit, when the output current of the transformer secondary side exceeds the limit value, the peak current of the primary side increases proportionally. The power management chip IC1 detects the voltage rise at PIN4 and cuts off the switch to play a protective role; it will only restart and restore the normal operation of the system when the voltage at PIN4 returns to normal.

[0054] The voltage supply circuit provides the supply voltage to the power management chip.

[0055] In some possible implementations, the voltage supply circuit includes: a second rectifier diode, an eleventh resistor, and a second electrolytic capacitor; wherein: one end of the eleventh resistor is connected to the negative terminal of the second rectifier diode, and the other end is connected to the positive terminal of the second electrolytic capacitor, the negative terminal of the second electrolytic capacitor is grounded; the positive terminal of the second rectifier diode is connected to one end of the tenth resistor.

[0056] like Figure 2 As shown, the voltage power supply circuit includes: rectifier diode D2 (i.e., the second rectifier diode), resistor R16 (i.e., the eleventh resistor), and electrolytic capacitor EC3 (i.e., the second electrolytic capacitor); the VCC power supply circuit provides the voltage (between 10-28 volts (V)) required for the operation of the power management chip IC1, which is powered by the transformer auxiliary winding Nf1.

[0057] The voltage feedback loop controls the accuracy of the power supply voltage based on the rated output voltage.

[0058] In some possible implementations, the voltage feedback loop includes an eighth resistor, a ninth resistor, and a tenth resistor; wherein the eighth resistor and the ninth resistor are connected in parallel, and the eighth resistor and the ninth resistor are connected in parallel and then connected in series with the tenth resistor.

[0059] like Figure 2 As shown, the voltage feedback loop, consisting of resistors R9 (the eighth resistor), R10 (the ninth resistor), and R11 (the tenth resistor), controls the accuracy of the output voltage to always meet the rated output requirements.

[0060] The second filter circuit filters the power supply voltage to obtain the output voltage at the output terminal.

[0061] In some possible implementations, the second filter circuit includes: a third rectifier diode, a second capacitor, and a third capacitor; wherein: the positive terminal of the third rectifier diode is connected to the positive terminal of the transformer, the negative terminal of the third rectifier diode is connected to the first terminal of the second capacitor and the first terminal of the third capacitor, and the second terminal of the second capacitor is connected to the second terminal of the third capacitor and the negative terminal of the transformer.

[0062] As shown in Figure 2 , the second filter circuit includes: rectifier diode D3 (i.e. the third rectifier diode), filter capacitor EC4 (i.e. the second capacitor), electrolytic capacitor EC5 (i.e. the third capacitor). The second filter circuit can be a rectifier filter circuit, and the LED circuit is composed of R14 and LED to indicate the output state of the product.

[0063] In some possible implementations, the optocoupler, the over-temperature protection resistor and the over-temperature protection capacitor form an over-temperature protection feedback loop 103, which lowers the voltage of the power input end of the power management chip to make the power management chip enter the off state when detecting the temperature rise in the load lithium battery.

[0064] As shown in Figure 3 , the optocoupler U1, the capacitor C3 (i.e. the over-temperature protection capacitor) and the resistor R15 (i.e. the over-temperature protection resistor) form an over-temperature protection feedback loop. The resistance value of the over-temperature protection resistor R15 is greater than a preset resistance value. The preset resistance value can be a large resistance value defined by the user; that is, the resistor R15 is a resistor with a very large resistance value.

[0065] The load lithium battery includes a negative temperature coefficient thermistor NTC, which is connected in parallel with the over-temperature protection resistor when the load lithium battery is inserted into the over-temperature protection feedback loop.

[0066] As shown in Figure 3 , when the load lithium battery is inserted into the seat charging device, the NTC with a negative temperature coefficient is connected in parallel with the resistor R15.

[0067] In some possible implementations, when the external environment temperature of the load lithium battery rises, the negative temperature coefficient of the thermistor of the load lithium battery decreases, and the light-emitting diode of the optocoupler enters the conduction state to lower the voltage of the power input end of the power management chip, so that the power management chip enters the off state. When the negative temperature coefficient of the thermistor of the load lithium battery increases, the light-emitting diode of the optocoupler enters the cutoff state from the conduction state to restore the voltage of the power input end of the power management chip, so that the power management chip enters the conduction state from the off state. As shown in Figure 3 , U1 is an optocoupler, which is connected across the VCC pin of the main chip IC1 and the secondary output Vout, and R15 is a resistor with a very large resistance value. When the load lithium battery is not inserted into the seat charging device, the resistor R15 cannot provide the minimum current required for the light-emitting diode of the optocoupler to work because the resistance value of the resistor R15 is very large, so the seat charging device does not work at this time, and there is no current on both sides of the optocoupler.

[0068] When the load lithium battery is inserted into the seat charging device, a negative temperature coefficient NTC is connected to the circuit in parallel with the resistor R15. At normal temperature, the resistance of the NTC is large enough to not drive the light emitting diode of the optocoupler to turn on, and the circuit does not work. The seat charging power supply can normally output to supply power to the load lithium battery. When the external environment changes, the temperature of the lithium battery rises, and since the NTC resistor is a negative temperature coefficient, the resistance of the NTC resistor will continuously decrease until the critical point is reached to cause the light emitting diode of the optocoupler U1 to be turned on. At this time, the phototriode of the optocoupler starts to be turned on, and since the collector of the phototriode of the optocoupler is connected to the VCC pin of the main chip IC1, the voltage of the VCC pin is pulled down, and at this time, the main chip IC1 cannot work, and the output end of the power supply is cut off, thereby realizing protection of the load lithium battery under a high-temperature condition. When the temperature inside the load lithium battery decreases, the resistance of the NTC resistor will continuously increase until the critical point is reached to cause the light emitting diode of the optocoupler U1 to be turned off, and at this time, the phototriode of the optocoupler is also turned off, and at this time, the collector voltage of the optocoupler is no longer pulled down, and the voltage of the VCC pin of the main chip IC1 returns to normal, and the power supply resumes work. In this way, by using a few simple devices (such as the optocoupler U1, C3, and R15), the seat charging device can realize detection of the temperature inside the load lithium battery to control the working state of the power supply; in the embodiment of the utility model, the change of the NTC resistance caused by the change of the load temperature is used, the electrical signal is transmitted to the main chip IC1 through the optocoupler, the working state of the power supply is controlled by affecting the VCC voltage of the main chip IC1 to realize over-temperature protection of the load lithium battery.

[0069] The power management chip 101 controls the conduction or disconnection of the output end of the primary seat charging circuit based on the voltage of the electrical input end.

[0070] Here, the power management chip 101 can be Figure 2 The main chip IC1 shown in the figure. The PIN1 of the main chip IC1 is connected to the power supply voltage VCC, the PIN2 is grounded (GND), the PIN3 is connected to the voltage feedback (FB), and the PIN4 is connected to the current feedback (CS); the PIN5-8 are used as output ends and are connected to the anode of the diode D1.

[0071] The first end of the primary charging circuit is connected to an external power supply, and the second end is connected to the input end of the power management chip; the first end and the second end of the optocoupler are connected across the power input end of the power management chip and the output end of the primary charging circuit; the first end of the over-temperature protection capacitor is connected to the first end of the optocoupler, and the second end of the over-temperature protection capacitor is grounded; the first end of the over-temperature protection resistor is connected to the second end of the optocoupler and the first end of the load lithium battery, and the second end of the over-temperature protection resistor is connected to the second end of the load lithium battery. In this way, when the load lithium battery is inserted into the over-temperature protection feedback loop to access the charging device, since the first end and the second end of the optocoupler are connected across the power input end of the power management chip and the output end of the primary charging circuit, if the temperature in the load lithium battery rises, the voltage at the power input end of the power management chip can be pulled down, and the power management chip enters a disconnected state based on the pulled-down voltage at the power input end, so that the output end of the primary charging circuit is disconnected. In this way, the charging device detects the temperature of the load lithium battery, and when the temperature of the lithium battery is detected to be too high, the output of the charging device is cut off to avoid the safety hazard caused by continuous charging of the lithium battery in a high-temperature state.

[0072] Optionally, the transmission medium can be a wired link (for example, but not limited to, a coaxial cable, an optical fiber, a digital subscriber line (DSL), etc.) or a wireless link (for example, but not limited to, Wireless Fidelity (WIFI), Bluetooth, and a mobile device network, etc.). It should be noted that the system provided in the above embodiments is only used as an example for the division of the above functional modules, and in actual applications, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the computer device is divided into different functional modules to complete all or part of the functions described above.

[0073] In addition, the embodiments can be implemented by a plurality of functional modules, for example, each functional module can be corresponding, or two or more functions can be integrated in one processing module, and the integrated module can be implemented in the form of hardware. It should be noted that the division of the modules in the embodiments is illustrative, and is only a logical function division. In actual implementation, another division mode can be used. It should be noted that all related contents of each step of the above charging device embodiments can be referred to the function description of the corresponding functional module, and will not be described here.

[0074] It should be understood that, in the case of employing integrated units, the system can include a processing module, a storage module. Among them, when the system is applied to a device, the processing module can be used to control and manage the actions of the device. The storage module can be used to support the device to execute mutual program codes, etc. Among them, the processing module can be a processor or a controller, which can realize or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure of the utility model. The processor can also be a combination of computing functions, such as including one or more microprocessor combinations, digital signal processing (Digital Signal Processing, DSP) and microprocessor combinations, etc., and the storage module can be a memory.

[0075] In the embodiments provided by the utility model, it should be understood that the disclosed system and seat charging device can be implemented by other means. For example, the system embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical function division. Actual implementation can have another division manner. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed systems or units can be indirect coupling or communication connection through some interfaces, systems or units, which can be electrical, mechanical or other forms.

[0076] It should be noted that: the above-mentioned embodiment of the utility model is in order only for description, not represents the pros and cons of the embodiment. The process depicted in the drawing does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multiple task processing and parallel processing are also possible or can be advantageous. Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment focuses on the differences from other embodiments. The above content is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.

Claims

1. A charging dock, characterized in that, The charging dock includes: a power management chip, a primary charging dock circuit, an optocoupler, an over-temperature protection resistor, and an over-temperature protection capacitor; wherein: The first end of the primary charging circuit is connected to an external power source, and the second end is connected to the input terminal of the power management chip. The first and second ends of the optocoupler are respectively connected between the electrical input terminal of the power management chip and the output terminal of the primary charging circuit. The first end of the over-temperature protection capacitor is connected to the first end of the optocoupler, and the second end of the over-temperature protection capacitor is grounded. The first end of the over-temperature protection resistor is connected to the second end of the optocoupler and the first end of the load lithium battery, and the second end of the over-temperature protection resistor is connected to the second end of the load lithium battery.

2. The charging device according to claim 1, characterized in that, The load lithium battery includes a thermistor with a negative temperature coefficient; when the load lithium battery is inserted into the charging device, the thermistor is connected in parallel with the over-temperature protection resistor.

3. A charging device according to claim 2, characterized in that, The resistance value of the over-temperature protection resistor is greater than the preset resistance value.

4. A charging device according to claim 1, characterized in that, The primary charging circuit includes: a first filter circuit, a voltage rectifier circuit, a voltage and current absorption circuit, a startup power supply circuit, an overcurrent protection circuit, a voltage feedback circuit, a voltage power supply circuit, a transformer, and a second filter circuit; wherein: The first end of the first filter circuit is connected to the external power supply, and the second end is connected to the first end of the voltage rectifier circuit; the first end of the transformer is connected to the output end of the power management chip, and the second end of the transformer is connected to the first end of the second filter circuit, which serves as the output end of the primary charging circuit; the second end of the voltage rectifier circuit is connected to the first end of the startup power supply circuit and the first end of the voltage and current absorption circuit; the second end of the voltage and current absorption circuit is connected to the output end of the power management chip and the first end of the transformer; the second end of the startup power supply circuit is connected to the input end of the power management chip; the third end of the startup power supply circuit is connected to the first end of the voltage power supply circuit, and the second end of the voltage power supply circuit is connected to the first end of the voltage feedback loop; the second end of the voltage feedback loop is connected to the first end of the overcurrent protection loop, which is connected to the power management chip.

5. A charging device according to claim 4, characterized in that, The first filter circuit includes: a fuse, a varistor, a common-mode inductor, and a first capacitor; wherein: One end of the fuse is connected to an external power source, and the other end is connected to the first end of the varistor, the first end of the first capacitor, and the first end of the common-mode inductor, respectively; the second end of the first capacitor is connected to the second end of the common-mode inductor and the second end of the varistor, respectively.

6. A charging device according to claim 4, characterized in that, The second filter circuit includes: a third rectifier diode, a second capacitor, and a third capacitor; wherein: The positive terminal of the third rectifier diode is connected to the positive terminal of the transformer, and the negative terminal of the third rectifier diode is connected to the first terminal of the second capacitor and the first terminal of the third capacitor, respectively. The second terminal of the second capacitor is connected to the second terminal of the third capacitor and the negative terminal of the transformer, respectively.

7. A charging device according to claim 5, characterized in that, The voltage rectifier circuit includes a current bridge and a first electrolytic capacitor; wherein: the first and third ends of the current bridge are connected to the fuse, the second and fourth ends are respectively connected to the first and second ends of the electrolytic capacitor, and the second end of the electrolytic capacitor is grounded.

8. A charging device according to any one of claims 4 to 6, characterized in that, The voltage and current absorption circuit includes: a first resistor, a second resistor, a third resistor, a fourth capacitor, and a first rectifier diode; wherein: The first end of the first resistor is connected to the second end of the second resistor, the second end of the third resistor, and the second end of the fourth capacitor, respectively; the first end of the second resistor is connected to the first end of the third resistor and the first end of the fourth capacitor, respectively; the second end of the first resistor is connected to the negative terminal of the first rectifier diode, and the positive terminal of the first rectifier diode is connected to the power management chip.

9. A charging device according to any one of claims 4 to 6, characterized in that, The startup power supply circuit includes: a fourth resistor, a fifth resistor, and a second electrolytic capacitor; wherein: the fourth resistor and the fifth resistor are connected in series, one end of the fourth resistor is connected to a high voltage, and one end of the fifth resistor is connected to the second electrolytic capacitor; The overcurrent protection circuit includes a sixth resistor and a seventh resistor connected in parallel.

10. A charging device according to claim 4, characterized in that, The voltage feedback loop includes: an eighth resistor, a ninth resistor, and a tenth resistor; wherein the eighth resistor and the ninth resistor are connected in parallel, and the tenth resistor is connected in series. The voltage supply circuit includes: a second rectifier diode, an eleventh resistor, and a second electrolytic capacitor; wherein: one end of the eleventh resistor is connected to the negative terminal of the second rectifier diode, and the other end is connected to the positive terminal of the second electrolytic capacitor, and the negative terminal of the second electrolytic capacitor is grounded; the positive terminal of the second rectifier diode is connected to one end of the tenth resistor.

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