Charging chip, power supply detection system, charging equipment and electronic equipment
By setting power input and detection pins in the charging chip and using voltage limiting, comparison, or switching circuits for power detection, the problem of high power detection cost in the prior art is solved, and convenient and safe power detection is achieved.
Patent Information
- Application Number
- CN202421476120.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-06-25
AI Technical Summary
In existing charging devices, power detection usually requires additional auxiliary circuitry, resulting in high costs and inconvenience.
By incorporating power input pins and power detection pins into the charging chip, and implementing power detection through voltage limiting circuits, comparator circuits, or switching circuits, the cost of power detection is reduced and safety is improved.
It enables convenient power supply detection, reduces the cost of power supply detection, and improves safety by preventing damage to electronic components through voltage limiting circuits.
Smart Images
Figure CN223744391U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of microelectronics, in particular to a charging chip, a power supply detection system, a charging device and an electronic device. BACKGROUND
[0002] With the rapid popularization of mobile phones and other portable electronic devices in daily life, users have higher and higher requirements for device charging. The existing charging device usually includes a charging chip, which is used for charging protection of the battery. In order to evaluate the working state and performance of the power supply system, power supply detection is usually performed on the power supply. CONTENT
[0003] The present application provides a charging chip, a power supply detection system, a charging device and an electronic device, which can more conveniently realize power supply detection.
[0004] In a first aspect, the present application provides a charging chip, comprising: a charging chip main body and a power supply access pin and a power supply detection pin arranged on the charging chip main body; wherein the power supply access pin and the power supply detection pin are electrically connected, the power supply access pin is used for connecting with a power supply, and the power supply detection pin is used for connecting with an electronic element for detecting whether the power supply has voltage.
[0005] In the embodiment of the present application, the power supply detection pin connected with the power supply access pin is arranged in the charging chip, so that the electronic element can detect the power supply voltage through the power supply detection pin, thereby conveniently realizing power supply detection. Moreover, no additional circuit for assisting power supply detection is needed, thereby reducing the cost of power supply detection.
[0006] In combination with the technical scheme provided in the above first aspect, in some possible implementation manners, the power supply access pin and the power supply detection pin are electrically connected through a voltage limiting circuit in the charging chip main body; wherein the voltage of the signal output by the voltage limiting circuit is within the voltage range supported by the electronic element.
[0007] In the embodiment of the present application, the power supply access pin and the power supply detection pin are connected through the voltage limiting circuit, so that the voltage of the signal output by the voltage limiting circuit is within the voltage range supported by the electronic element, thereby preventing the electronic element from being damaged due to the excessively large voltage of the signal output by the voltage limiting circuit, and improving the safety of the present application.
[0008] With the technical solution provided in the first aspect above, in some possible implementation manners, the voltage limiting circuit comprises: a first voltage dividing resistor and a second voltage dividing resistor; a first end of the first voltage dividing resistor is connected with the power input pin, and a second end of the first voltage dividing resistor is connected with a first end of the second voltage dividing resistor; a first end of the second voltage dividing resistor is also connected with the power detection pin, and a second end of the second voltage dividing resistor is configured to be connected with a reference ground.
[0009] In the embodiments of the present application, the first voltage dividing resistor and the second voltage dividing resistor are used to divide the power supply voltage, so as to reduce the voltage output by the power detection pin, thereby achieving the effect of reducing the power supply voltage.
[0010] With the technical solution provided in the first aspect above, in some possible implementation manners, the voltage limiting circuit is a comparison circuit; a first input end of the comparison circuit is configured to receive a reference voltage, a second input end of the comparison circuit is connected with the power input pin, and an output end of the comparison circuit is connected with the power detection pin; the comparison circuit is configured to output a first signal when the reference voltage is greater than the power supply voltage, and output a second signal when the reference voltage is less than or equal to the power supply voltage; wherein the reference voltage is less than the rated output voltage of the power supply.
[0011] In the embodiments of the present application, the comparison circuit can accurately identify whether the power supply voltage is greater than the reference voltage, so that the first signal and the second signal can be used to indicate whether the power supply voltage exists. Therefore, it is not necessary to additionally set other auxiliary circuits for power detection, and the power detection of the power supply is conveniently realized.
[0012] With the technical solution provided in the first aspect above, in some possible implementation manners, the reference voltage is greater than a first preset voltage, and the first preset voltage is the minimum voltage required for the electronic element to work.
[0013] In the embodiments of the present application, by setting the reference voltage to be greater than the first preset voltage, it can be further determined whether the power supply voltage can support the normal work of the electronic element.
[0014] With the technical solution provided in the first aspect above, in some possible implementation manners, the voltage limiting circuit is a switch circuit; an input end of the switch circuit is configured to receive a third signal, an output end of the switch circuit is connected with the power detection pin, and an enable end of the switch circuit is connected with the power input pin; wherein the enable voltage of the switch circuit is less than the rated output voltage of the power supply.
[0015] In the embodiment of the present application, the power supply voltage control switch circuit is turned on and off, so that whether the power supply voltage exists can be determined by whether the third signal is received. Therefore, the power supply detection of the power supply can be conveniently realized without setting other auxiliary circuits for power supply detection.
[0016] In some possible implementation manners, the enable voltage is greater than a first preset voltage, and the first preset voltage is the minimum voltage required for the electronic element to work.
[0017] In the embodiment of the present application, the enable voltage of the switch circuit is set to be greater than the first preset voltage, so that whether the power supply voltage can support the electronic element to work normally can be further determined.
[0018] In a second aspect, the present application provides a power supply detection system, comprising: the charging chip and the processor as described in the first aspect and / or any possible implementation manner of the first aspect, and a power supply detection end of the processor and a power supply detection pin of the charging chip are connected.
[0019] In a third aspect, the present application provides a charging device, comprising the charging chip as described in the first aspect and / or any possible implementation manner of the first aspect.
[0020] In a fourth aspect, the present application provides an electronic device, comprising the power supply detection system as described in the second aspect. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor.
[0022] Figure 1 The structural block diagram of the first charging chip shown in the embodiment of the present application is shown in the figure.
[0023] Figure 2 The structural block diagram of the second charging chip shown in the embodiment of the present application is shown in the figure.
[0024] Figure 3 The structural block diagram of the power supply detection system shown in the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION
[0025] The terms "first", "second", "third", etc. are only used for distinction and description, and do not mean the arrangement number, and cannot be understood as indicating or implying relative importance.
[0026] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0027] In the description of the present application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0028] In the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements.
[0029] The technical solutions of the present application will be described below in conjunction with the drawings.
[0030] Please refer to Figure 1 The present application provides a charging chip to more conveniently realize power supply detection of a power supply.
[0031] As Figure 1 shown, the charging chip includes a charging chip main body and a power supply access pin (as Figure 1 shown, VDD pin), a power supply detection pin (as Figure 1 shown, STDBY pin) arranged on the charging chip main body.
[0032] Among them, the power supply access pin and the power supply detection pin are electrically connected, the power supply access pin is used to connect with the power supply, and the power supply detection pin is used to connect with the electronic element for detecting whether the power supply has voltage.
[0033] Optionally, the electronic component can be an integrated circuit chip with signal processing capability. Alternatively, the electronic component can also be a general-purpose processor, including a microprocessor (Microprocessor), a CPU (Central Processing Unit, Central Processing Unit), a NP (Network Processor, Network Processor), etc.; it can also be a DSP (Digital Signal Processor, Digital Signal Processor), an ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array, Field Programmable Gate Array) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
[0034] In one embodiment, the power access pin and the power detection pin can be directly connected, in which case the voltage output by the power detection pin is equal to the voltage input by the power access pin.
[0035] Optionally, when the electronic component detects that the power detection pin outputs a voltage value, it is considered that the power supply has voltage. When the electronic component detects that the power detection pin does not output a voltage value, it is considered that the power supply does not have voltage.
[0036] Optionally, a first threshold voltage can be preset in the electronic component, and the first threshold voltage is the voltage value of normal power supply of the power supply. When the voltage value detected by the electronic component from the power detection pin is less than the first threshold voltage, it is considered that the power supply does not have voltage. When the voltage value detected by the electronic component from the power detection pin is greater than or equal to the first threshold voltage, it is considered that the power supply has voltage.
[0037] The voltage obtained by the voltage dividing circuit from the normal working voltage of the VDD power supply is set as a threshold voltage, and the threshold voltage is the voltage on R2. If the VDD power supply voltage increases, the voltage on R2 will also increase. When the voltage on R2 does not reach the threshold voltage, the STDBY terminal outputs a signal to the external circuit, which represents that the VDD power supply has no voltage. When the voltage on R2 reaches the threshold voltage, the STDBY terminal outputs a signal to the external circuit, which represents that the VDD power supply has voltage.
[0038] In one embodiment, the power access pin and the power detection pin are electrically connected through a voltage limiting circuit in the charging chip body.
[0039] In the above embodiment, the voltage of the signal output by the voltage limiting circuit is within the voltage range supported by the electronic component.
[0040] For example, if the voltage range supported by the electronic component is 0-3V, the voltage of the signal output by the voltage limiting circuit is within 0-3V. This example is only for the convenience of understanding and should not be considered as a limitation of the present application.
[0041] In one embodiment, the voltage limiting circuit can be a voltage dividing circuit, so that the voltage dividing circuit can be used to divide the voltage of the power supply voltage received by the power supply access pin, so as to reduce the voltage of the signal output by the power supply detection pin. This can prevent the voltage of the signal output by the power supply detection pin from being too high, which can damage the electronic component, thereby improving the safety of the present application.
[0042] Optionally, as shown in Figure 2 , the voltage dividing circuit can include a first voltage dividing resistor and a second voltage dividing resistor.
[0043] The first end of the first voltage dividing resistor (R1 as shown in Figure 2 ) is connected to the power supply access pin (VDD pin as shown in Figure 2 ), and the second end of the first voltage dividing resistor is connected to the first end of the second voltage dividing resistor (R2 as shown in Figure 2 ).
[0044] The first end of the second voltage dividing resistor is also connected to the power supply detection pin (STDBY pin as shown in Figure 2 ), and the second end of the second voltage dividing resistor is used to be connected to the reference ground (GND interface as shown in Figure 2 ).
[0045] The first voltage dividing resistor and the second voltage dividing resistor are used to divide the power supply voltage, so as to reduce the voltage output by the power supply detection pin, thereby achieving the effect of reducing the power supply voltage.
[0046] Specifically, U1 represents the power supply voltage, U2 represents the voltage output by the power supply detection pin, R1 represents the resistance value of the first voltage dividing resistor, and R2 represents the resistance value of the second voltage dividing resistor. In this embodiment, when the power supply access pin is connected to the power supply voltage, U2=U1*R2÷(R1+R2). Thus, the voltage output by the power supply detection pin is reduced, which prevents the electronic component from being damaged due to the excessively high output voltage, thereby improving the safety of the present application.
[0047] Optionally, when the electronic component detects that the power supply detection pin outputs a voltage value, it is considered that the power supply has a voltage. When the electronic component detects that the power supply detection pin does not output a voltage value, it is considered that the power supply does not have a voltage.
[0048] Alternatively, a second threshold voltage can also be preset in the electronic component, and the second threshold voltage is a voltage value on the second voltage dividing resistor when the power supply normally supplies power. When the voltage value detected by the electronic component from the power supply detection pin is less than the second threshold voltage, it is considered that the power supply does not have voltage. When the voltage value detected by the electronic component from the power supply detection pin is greater than or equal to the second threshold voltage, it is considered that the power supply has voltage.
[0049] The specific resistance values of the first voltage dividing resistor and the second voltage dividing resistor can be set according to actual needs, and the specific values are not limited herein.
[0050] Optionally, the first voltage dividing resistor can be one resistor, or the first voltage dividing resistor can also include a plurality of resistors connected in series.
[0051] For example, the first voltage dividing resistor can include n resistors, where the n resistors included in the first voltage dividing resistor are R 11 , R 12 , R 13 , …, and R 1n . The resistance value of the first voltage dividing resistor is R 11 + R 12 + R 13 + … + R 1n , where n is a positive integer.
[0052] Optionally, the first voltage dividing resistor can also include a plurality of resistors connected in parallel.
[0053] For example, the first voltage dividing resistor can include n resistors, where the n resistors included in the first voltage dividing resistor are R 11 , R 12 , R 13 , …, and R 1n . The reciprocal of the resistance value of the first voltage dividing resistor is the sum of the reciprocals of the resistance values, that is, 1 / R1=(1 / R 11 )+(1 / R 12 )+…(1 / R 1n ), where R1 is the resistance value of the first voltage dividing resistor. If the resistance values of R 11 , R 12 , R 13 , …, and R 1n are equal, that is, R 11 =R 12 =R 13 =R 1n , the resistance value of the first voltage dividing resistor is (R 1n / n). Where n is a positive integer.
[0054] In addition to the embodiments described above, the first voltage divider resistor can also be a circuit equivalent to a resistor, composed of any other circuit. For example, a circuit composed of multiple resistors connected in series and parallel that is equivalent to a single resistor, or a transistor such as a MOSFET can be used as a resistor.
[0055] Optionally, the second voltage divider resistor can be a single resistor, or it can include multiple resistors connected in series.
[0056] For example, the second voltage divider resistor may include m resistors, wherein the m resistors in the second voltage divider resistor are Rm, ... 21 R 22 R 23 …R 2m The resistance value of the second voltage divider resistor is R. 21 +R 22 +R 23 +…+R 2m Where m is a positive integer.
[0057] Optionally, the second voltage divider resistor may also include multiple resistors connected in parallel.
[0058] For example, the second voltage divider resistor may include m resistors, wherein the m resistors in the second voltage divider resistor are Rm, ... 21 R 22 R 23 …R 2m The reciprocal of the resistance value of the second voltage divider resistor is the sum of the reciprocals of the individual resistance values, that is, 1 / R² = (1 / R... 21 )+(1 / R 22 )+…(1 / R 2m ), where R2 is the resistance value of the second voltage divider resistor. If R 21 R 22 R 23 …R 2m The resistance values are equal, that is, R 21 =R 22 =R 23 =R 2m Then the resistance value of the second voltage divider resistor is (R 2m / m). Where m is a positive integer.
[0059] In addition to the embodiments described above, the second voltage divider resistor can also be a circuit equivalent to a resistor, composed of any other circuit. For example, a circuit that is equivalent to a single resistor by connecting multiple resistors in series and parallel, or a transistor such as a MOSFET can be used as a resistor.
[0060] In one implementation, the voltage limiting circuit can also be a comparator circuit.
[0061] The first input end of the comparison circuit is used for receiving a reference voltage, the second input end of the comparison circuit is connected with the power supply access pin, and the output end of the comparison circuit is connected with the power supply detection pin; the comparison circuit is used for outputting a first signal when the reference voltage is greater than the power supply voltage, and outputting a second signal when the reference voltage is less than or equal to the power supply voltage; wherein the reference voltage is less than the rated output voltage of the power supply.
[0062] The comparison circuit can accurately identify whether the power supply voltage is greater than the reference voltage, so that whether the power supply exists voltage can be indicated by the first signal and the second signal.
[0063] The first signal and the second signal output by the comparison circuit are different, for example, the first signal can be a low voltage signal (such as 0V, 0.1V, 0.2V, 0.3V, etc.), and the second signal can be a high voltage signal (such as 1V, 2V, 3V, etc., a voltage signal higher than the low voltage signal); or the first signal is a high voltage signal, and the second signal is a low voltage signal. The examples are only for easy understanding and should not be considered as a limitation of the present application.
[0064] Optionally, the reference voltage can be obtained from a third-party circuit.
[0065] Alternatively, the reference voltage can also be converted from the power supply voltage when the charging chip accesses the power supply voltage. In this case, when the charging chip does not access the power supply voltage, the power supply detection pin is in an idle state, so that the electronic element can identify whether the power supply exists voltage, and can further determine whether the voltage of the power supply is greater than the reference voltage.
[0066] Optionally, the reference voltage is greater than a first preset voltage, and the first preset voltage is the minimum voltage required for the electronic element to work.
[0067] Since the reference voltage is greater than the minimum voltage required for the electronic element to work, in this case, it indicates that the power supply voltage accessed by the power supply access pin cannot meet the working requirement of the electronic element. When the comparison circuit outputs the first signal, it indicates that the power supply voltage accessed by the power supply access pin can meet the working requirement of the electronic element.
[0068] For example, if the minimum voltage required for the electronic element to work normally is 4V, the reference voltage can be set to 4V. In the case that the power supply voltage is less than 4V, it cannot make the electronic element work normally, so it can be considered that there is no rated power supply voltage. In the case that the power supply voltage is greater than 4V, the electronic element can work normally, so it is considered that there is a power supply voltage. The examples are only for easy understanding and should not be considered as a limitation of the present application.
[0069] Optionally, the comparison circuit can be any type of comparison circuit, and the specific circuit principle of the comparison circuit is not described herein.
[0070] In an implementation, the voltage limiting circuit can also be a switch circuit.
[0071] The input end of the switch circuit is configured to receive a third signal, the output end of the switch circuit is connected with the power supply detection pin, and the enable end of the switch circuit is connected with the power supply access pin; and the enable voltage of the switch circuit is less than the rated output voltage of the power supply.
[0072] The specific setting of the third signal can be set according to actual needs, and the specific manner is not limited herein.
[0073] The switch circuit is controlled to be turned on or turned off by the power supply voltage, so that whether the power supply has voltage can be determined by whether the third signal is received.
[0074] For example, when the power supply voltage is greater than or equal to the enable voltage of the switch circuit, the switch circuit is turned on, and the power supply detection pin outputs the third signal. When the power supply voltage is less than the enable voltage of the switch circuit, the switch circuit is not turned on, and the power supply detection pin does not output the third signal.
[0075] Optionally, the enable voltage can be greater than the first preset voltage, and the first preset voltage is the minimum voltage required for the electronic element to work.
[0076] Since the enable voltage is greater than the minimum voltage required for the electronic element to work, in this case, when the switch circuit outputs the third signal, it indicates that the power supply voltage accessed by the power supply access pin can meet the working requirements of the electronic element. When the switch circuit does not output the third signal, it indicates that the power supply voltage accessed by the power supply access pin cannot meet the working requirements of the electronic element.
[0077] Optionally, the specific implementation of the switch circuit can be set according to actual needs, for example, it can be realized by using a MOS transistor or other transistors. The specific implementation of the switch circuit is well known to those skilled in the art, and the specific circuit principle of the switch circuit is not described herein.
[0078] For the convenience of understanding, the switch circuit is taken as an example including a switch resistor and a PMOS transistor. The first end of the switch resistor is configured to receive the third signal, the second end of the switch resistor is connected with the drain of the PMOS transistor, the gate of the PMOS transistor is connected with the power supply access pin, and the source of the PMOS transistor is connected with the power supply detection pin.
[0079] Alternatively, the switch circuit can include a switch resistor and an NMOS transistor as an example for illustration. The first end of the switch resistor is configured to receive the third signal, the second end of the switch resistor is connected with the drain of the NMOS transistor, the gate of the NMOS transistor is connected with the power-on pin, and the source of the NMOS transistor is connected with the power detection pin.
[0080] Based on the same technical concept, the application further provides a power detection system, as shown in the accompanying drawings. The power detection system includes a charging chip and a processor. Figure 3
[0081] The power detection end of the processor is connected with the power detection pin of the charging chip.
[0082] The specific implementation and principle of the charging chip have been described in the foregoing, and thus will not be described again in detail.
[0083] Optionally, the processor is the electronic element in the charging chip embodiment.
[0084] The processor can be an integrated circuit chip and has a signal processing capability. Alternatively, the processor can also be a general-purpose processor, including a microprocessor (Microprocessor), a CPU (Central Processing Unit, Central Processing Unit), a NP (Network Processor, Network Processor), etc. The processor can also be a DSP (Digital Signal Processor, Digital Signal Processor), an ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array, Field Programmable Gate Array) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
[0085] Optionally, the power port of the processor is connected with the power output port of the charging chip, so as to realize power supply for the processor based on the charging chip.
[0086] Based on the same technical concept, the application further provides a charging device, which includes the charging chip.
[0087] The charging device can be a charger of an electronic device such as a mobile phone, a tablet computer, a Bluetooth headset, etc., or can be a charging device of a large power consumption device such as an electric vehicle.
[0088] Based on the same technical concept, the application further provides an electronic device, which includes the power detection system.
[0089] Among them, the electronic device can be, for example, a television, an air conditioner, a washing machine, etc.
[0090] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A charging chip, characterized by, The charging chip comprises: a charging chip body and a power supply access pin and a power supply detection pin arranged on the charging chip body; wherein the power supply access pin and the power supply detection pin are electrically connected through a voltage limiting circuit in the charging chip body, the power supply access pin is used for connecting with a power supply, and the power supply detection pin is used for connecting with an electronic element for detecting whether there is voltage in the power supply; a voltage of a signal output by the voltage limiting circuit is within a voltage range supported by the electronic element; the voltage limiting circuit comprises a first voltage dividing resistor and a second voltage dividing resistor; a first end of the first voltage dividing resistor is connected with the power supply access pin, and a second end of the first voltage dividing resistor is connected with a first end of the second voltage dividing resistor; a first end of the second voltage dividing resistor is also connected with the power supply detection pin, and a second end of the second voltage dividing resistor is used for connecting with a reference ground.
2. The charging chip according to claim 1, wherein, The voltage limiting circuit is a comparison circuit; a first input end of the comparison circuit is used for receiving a reference voltage, a second input end of the comparison circuit is connected with the power supply access pin, and an output end of the comparison circuit is connected with the power supply detection pin; the comparison circuit is used for outputting a first signal in a case that the reference voltage is greater than a power supply voltage; outputting a second signal in a case that the reference voltage is less than or equal to the power supply voltage; wherein the reference voltage is less than a rated output voltage of the power supply.
3. The charging chip according to claim 2, wherein, The reference voltage is greater than a first preset voltage, and the first preset voltage is a minimum voltage required for the electronic element to work.
4. The charging chip of claim 1, wherein, The voltage limiting circuit is a switch circuit; an input end of the switch circuit is used for receiving a third signal, an output end of the switch circuit is connected with the power supply detection pin, and an enable end of the switch circuit is connected with the power supply access pin; wherein an enable voltage of the switch circuit is less than the rated output voltage of the power supply.
5. The charging chip according to claim 4, wherein, The enable voltage is greater than the first preset voltage, and the first preset voltage is the minimum voltage required for the electronic element to work.
6. A power supply detection system characterized by comprising: The charging chip comprises: a charging chip and a processor according to any one of claims 1-5; a power supply detection end of the processor is connected with the power supply detection pin of the charging chip.
7. A charging device, characterized by The charging chip according to any one of claims 1-5 is comprised.
8. An electronic device, comprising: The power supply detection system according to claim 6 is comprised.