WO2019100301A1

WO2019100301A1 - Charging apparatus

Info

Publication number: WO2019100301A1
Application number: PCT/CN2017/112727
Authority: WO
Inventors: 杨必华; 陈增源
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2019-05-31
Also published as: CN111344926A

Abstract

A charging apparatus (10), comprising: a conversion circuit (11), an output interface (12), a voltage sensing control unit (13), and a current sensing control unit (14). The conversion circuit is used for receiving an alternating-current electric signal and converting same into a direct-current electric signal; the output interface is electrically connected to the conversion circuit and is used for transmitting the direct-current electric signal to an electronic device (20); the direct-current electric signal comprises a charging voltage and a charging current; the voltage sensing control unit is electrically connected to the output interface and the conversion circuit; the voltage sensing control unit detects the charging voltage and outputs a voltage control signal to the conversion circuit according to the detected voltage, so as to control the charging voltage to be less than a voltage threshold; the current sensing control unit is electrically connected to the output interface and the conversion circuit; the current sensing control unit detects the charging current and outputs a current control signal to the conversion circuit according to the detected current, so as to correspondingly control the charging current to be less than a current threshold; the voltage sensing control unit and the current sensing control unit do not work simultaneously. By means of the scheme, safe charging can be realized.

Description

Charging device

Technical field

The present invention relates to a charging technology, and in particular to a charging device capable of providing fast or normal charging for an electronic device.

Background technique

With the widespread use of smart electronic products, the power consumption of smart electronic products has gradually increased with time of use or running programs. In addition to increasing the battery capacity of smart electronic products, fast charging of batteries to reduce charging time has become a solution to the current increase in battery power consumption.

The usual solution for performing fast charging is to increase the charging current. When the charging current is increased, the charging adapter, the charging cable, and the electronic device to be charged will also be subjected to a corresponding increase in voltage during charging.

In the prior art, in order to ensure charging safety, the charging device generally performs voltage detection on the output charging voltage, that is, by detecting the output voltage in real time to determine whether the power signal output by the charging device is overvoltage, but actually, In the process of rapid charging, the current is large. If the voltage detection is used, it is obviously impossible to accurately determine the actual situation of the power signal output by the charging device, which leads to an increase in the amount of heat generated by the electronic device due to excessive charging current, thereby making the battery as the power supply unit. Overcharged and damaged, and when it is overcharged, it will generate a large amount of heat and damage the entire electronic device, even threatening the user's personal safety.

Summary of the invention

Embodiments of the present invention disclose a charging device that can be relatively safe.

The invention discloses a charging device, comprising: a conversion circuit, an output interface, a voltage sensing control unit and a current sensing control unit. The conversion circuit is for receiving an alternating current signal and converting it into a direct current signal. The output interface is electrically connected to the conversion circuit and the external electronic device for transmitting the DC signal to the external electronic device, and the DC signal includes a charging voltage and a charging current. The voltage sensing control unit is electrically connected to the output interface and the conversion circuit, and the voltage sensing control unit detects the charging voltage and outputs a voltage control signal to the conversion circuit according to the detection voltage to correspondingly control the The charging voltage is less than the voltage threshold. The current sensing control unit is electrically connected to the output interface and the conversion circuit, and the current sensing control unit detects the charging current and outputs a current control signal to the conversion circuit according to the detection current, and controls the charging current accordingly. Less than the current threshold. The voltage sensing control unit operates differently from the current sensing control unit.

Compared with the prior art, the voltage sensing control unit and the current sensing control unit respectively perform normal charging and fast charging, and the charging sensing voltage outputted by the output interface is fixed and the charging current is small due to normal charging, and the voltage sensing control unit is adopted. To control the charging voltage to prevent it from exceeding the voltage threshold; and because the charging current is large during rapid charging, and the charging voltage is changing at any time, the point voltage sensing control unit continues to be used to accurately obtain the charging current change, and charging The change of voltage is inconvenient for the detection and control of the voltage sensing control unit. However, in this case, by suspending the detection control of the voltage sensing control unit, the current detecting control unit is used to detect the charging current outputted by the output interface in real time. The reference current is provided to adjust the output of the conversion circuit, thereby ensuring that the charging current can be stabilized and less than the current threshold, thereby preventing overcharging of the electronic device.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.

FIG. 1 is a schematic diagram showing the circuit structure of a charging device and an external electronic device to be charged.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The circuit structure and working process of the charging device will be specifically described below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a schematic diagram of the circuit structure of the charging device 10 and the external electronic device 20 to be charged.

As shown in FIG. 1 , the charging device 10 is electrically connected to the electronic device 20 to be charged through the charging cable LN, and the charging device 10 is configured to convert the AC power into a DC signal and transmit the signal to the electronic device 20 through the charging cable LN. Thereby, the electronic device 20 is charged. The DC signal includes a first charging voltage and a first charging current.

Specifically, the charging device 10 includes a conversion circuit 11, an output interface 12, a voltage sensing control unit 13, and a current sensing control unit 14.

The conversion circuit 11 includes an isolation flyback circuit 110 and an optocoupler circuit 114. The isolation flyback circuit 110 includes a first input end 111, a first output end 112, and a first adjustment end 113. The first input end 111 is electrically connected to the AC power source AC, and the isolation flyback circuit 110 is configured to convert the AC power signal AC into The DC signal is output through the first output 112. The first regulating end 113 is electrically connected to the optocoupler circuit 114. The optocoupler circuit 114 is configured to receive the adjustment signal and control the isolation flyback circuit 110 to adjust the voltage and current of the output DC signal according to the adjustment signal.

The output interface 12 is electrically connected to the first output terminal 112 and the charging cable LN for transmitting the DC signal to the electronic device 20 through the charging cable LN.

Specifically, the output interface 12 includes a first power pin Vbus, a first ground pin G1, a first data pin D1, and a second data pin D2, and the first power pin Vbus is used with the first ground pin G1. The first data pin D1 and the second data pin D2 are used to transmit a data signal, which may be from the electronic device 20, for transmitting the charging voltage V and the charging current I. In this embodiment, the first power pin Vbus is a high voltage terminal, and the first ground pin G1 is a low voltage reference terminal, for example, 0V. Preferably, the charging device 10 further includes a first capacitor C1. The first capacitor C1 is electrically connected between the first power pin Vbus and the ground GND, and is used for filtering and regulating the DC signal for the first power pin Vbus.

In this embodiment, the charging device 10 includes two charging states, the two charging states being normal charging and fast charging, and the setting of the charging state is set by the electronic device 20 according to the input operation received in real time.

When the charging device 10 is in normal charging, the output interface 12 outputs a fixed charging voltage V and a fixed charging current; when the charging device 10 is in rapid charging, the output interface 12 outputs as the module being charged in the electronic device 20 is charging. The voltage varies with the charging voltage and the fixed charging current, wherein the charging current during fast charging is greater than the current during normal charging.

Here, for the sake of easy understanding, the operation mode of the electronic device 20 will be specifically described. For electronic device 20 The DC signal provided by the charging device 10 is received and stored. Specifically, the electronic device 20 includes a connection interface 21, a charging control circuit 22, a switching circuit 23, and an energy storage unit 24.

The structure of the connection interface 21 is the same as that of the output interface 12, and includes a second power pin Vbus, a second ground pin G2, a third data pin D3 and a fourth data pin D4, and a second power pin Vbus and The two ground pins G2 cooperate to transmit the charging voltage V and the charging current I, and the third data pin D3 and the fourth data pin D4 are used for transmitting the data signal. The first power pin Vbus, the first ground pin G1, the first data pin D1, and the second data pin D2 of the output interface 11 are sequentially connected to the second power pin Vbus and the second ground lead of the connection interface 21. The pin G2 and the third data pin D3 are electrically connected to the fourth data pin D4 in one-to-one correspondence.

The charge control circuit 22 is connected in parallel with the switch circuit 23 and is electrically connected between the second power pin Vbus/second ground pin G2 and the energy storage unit 24. The charging control circuit 12 is configured to convert the charging current I into a second charging current I2 and transmit it to the energy storage unit 24; the switching circuit 24 is configured to directly transmit the charging voltage V and the charging current I directly to the energy storage unit 24, wherein The second charging current I2 is smaller than the charging current I, the second charging current I2 corresponds to normal charging, the charging current I corresponds to fast charging, and the charging control circuit 12 does not operate simultaneously with the switching circuit 24.

The electronic device 20 can select the charging control circuit 22 to perform normal charging or the selection switch circuit 23 to perform fast charging according to the setting operation of the user, and also to connect the interface 21 when the electronic device 20 can operate according to the setting of the user. The third data pin D3 and the fourth data pin D4 will output a data signal corresponding to the setting operation to the charging device 10.

For the charging device 10, the voltage sensing control unit 13 corresponds to the charging voltage for controlling the output of the output interface 12 during normal charging, which is smaller than the voltage threshold Vth, and the current sensing control voltage 14 is used for controlling the output of the output interface 12 for fast charging. The charging current is less than the current threshold Ith. It should be noted that, since normal charging and fast charging do not exist at the same time, correspondingly, the voltage sensing control unit 13 and the current sensing control unit 14 do not work at the same time.

The voltage sensing control unit 13 is electrically connected to the output interface 12 and the conversion circuit 11. When the charging device 10 is in a normal charging state, that is, when the output interface 12 outputs the second charging current I2, the voltage sensing control unit 13 detects the The charging voltage is output and a voltage control signal is outputted to the conversion circuit 11 in accordance with the detection voltage, thereby correspondingly controlling the charging voltage to be less than the voltage threshold Vth.

The current sensing control unit 14 is electrically connected to the output interface 12 and the conversion circuit 11, when charging When the output terminal 12 outputs the charging current I, the current sensing control unit 14 detects the charging current and outputs a current control signal to the conversion circuit 11 according to the detection current, thereby correspondingly controlling the charging current. Less than the current threshold Ith.

More specifically, the voltage sensing control unit 13 includes a voltage sensing circuit 131, a first adjusting unit 132, and a first switch 133.

The voltage sensing circuit 131 is electrically connected between the first power pin Vbus and the ground GND, and the voltage sensing circuit 131 is configured to detect the charging voltage and output the first detecting voltage Vs.

The voltage sensing circuit 131 includes a detection voltage output terminal 1311, a first voltage dividing resistor R1, and a second voltage dividing resistor R2. The first voltage dividing resistor R1 is electrically connected between the first power supply pin Vbus and the detection voltage output terminal Vs1, and the second voltage dividing resistor R2 is electrically connected between the detection voltage output terminal Vs1 and the ground terminal GND. The detection voltage output terminal Vs1 is electrically connected to the first adjustment unit 132 and is used to output the first detection voltage Vs to the first adjustment unit 132.

The first adjusting unit 132 is electrically connected to the voltage sensing circuit 131 and the first switch 133. The first adjusting unit 132 outputs a voltage adjusting signal according to the first detecting voltage Vs.

The first adjustment unit 132 includes a first comparator COMP1 and a first loop compensation unit Gf1. The first comparator COMP1 includes a first positive phase input terminal IN1, a first inverting input terminal IN2, and a first comparison output terminal CO1. The first positive phase input terminal IN1 is electrically connected to a first reference voltage source (not shown) to receive the first reference voltage Vref. The first inverting input terminal IN2 is electrically connected to the detection voltage output terminal Vs1 to receive the first detection voltage Vs. The first comparison output CO1 is electrically connected to the first switch 133 and is used to output a voltage adjustment signal Sv. In this embodiment, the first reference voltage Vref is 2.5V, and the first reference voltage Vref corresponds to the saturation voltage of the energy storage unit 24, so that the phenomenon of overvoltage charging for the electronic device 20 can be accurately prevented.

The loop compensation unit Gf1 is electrically connected between the first inverting input terminal IN2 and the first comparison output terminal CO1 for maintaining the operational stability of the first comparator COMP1. In this embodiment, the loop compensation unit Gf1 may be composed of a resistor and a capacitor connected in series.

The first switch 133 is electrically connected between the first adjusting unit 132 and the conversion circuit 11 for transmitting the voltage adjustment signal Sv to the conversion circuit 11 when the charging device 10 is in normal charging. Correspondingly, the conversion circuit 11 can be The voltage adjustment signal Sv adjusts the charging voltage V to control the charging voltage to be less than the voltage threshold Vth.

The first switch 133 includes a first switch control terminal 1331 and a second switch control terminal 1332. The first switch control terminal 1331 is electrically connected to the first comparison output terminal CO1, and the second switch control terminal 1332 is electrically connected to the optocoupler of the conversion circuit 11. Circuit 114. In the present example, the first switch 133 is a diode, wherein the positive terminal of the diode serves as the second switch control terminal 1332, and the negative terminal serves as the first switch control terminal 1331.

When the voltage of the second switch control end 1332 is greater than the first switch control end 1331, the first switch 133 is in an on state, and the first switch control end 1331 and the second switch control end 1332 are electrically conductive; The voltage of the second switch control end 1332 is smaller than the first switch control end 1331, the first switch 133 is in an off state, and the first switch control end 1331 and the second switch control end 1332 are electrically disconnected.

The current sensing control unit 14 includes a current sensing circuit 141, a second adjusting unit 142, a second switch 143, and a reference setting unit 144.

The current sensing circuit 141 is electrically connected between the first power supply pin Vbus and the first ground terminal G1 for detecting the charging current and outputting the detection current Is. In this embodiment, the current sensing circuit 141 outputs a representative detection current. The sampling voltage Vi of Is.

The reference setting unit 144 is electrically connected to the first data pin D1 and the second data pin D2 for outputting the adjustment voltage Vadj representing the reference current to the second adjusting unit 142 according to the data signal.

The second adjusting unit 142 is electrically connected to the current sensing circuit 141, the reference setting unit 144, and the second switch 143. The second adjusting unit 142 outputs a current adjustment signal according to the adjustment voltage Vadj and the sampling voltage Vi.

The second switch 143 is electrically connected between the second adjusting unit 142 and the conversion circuit 11 . The second switch 142 is for being in an on state when the charging device 10 is in rapid charging and transmitting the current adjustment signal Si to the conversion circuit 11. Correspondingly, the conversion circuit 11 adjusts the charging current I according to the current adjustment signal Si to control the charging current I to be smaller than the current threshold Ith.

More specifically, the current sensing circuit 141 includes a first sense resistor R3 and a current sampling unit 1411. The first detecting resistor R3 is used to load the charging current I, thereby acquiring the detecting current Is.

The first detecting resistor R3 includes a first conductive end 1412 and a second conductive end 1413. The first conductive end 1412 is electrically connected to the first power pin Vbus through the first capacitor C1, and the second conductive end 1413 is electrically connected to the first Ground pin G1. It should be noted that the charging current obtained by the first detecting resistor R1 flows into the first power pin Vbus, the energy storage unit 24, the first ground pin G1, the first detecting resistor R3, and the ground GND.

The current sampling unit 1411 is electrically connected to the first conductive end 1412 and the second conductive end 1413 for acquiring the sampling voltage Vi obtained by loading the charging current by the first detecting resistor R3. Wherein, the voltage Vi is proportional to the detection current obtained by the detection, and the detection current is also the charging current, wherein the ratio is the resistance value of the first detecting resistor R3. Preferably, the current sampling unit 1411 is configured to perform amplification processing for the voltage V employed.

The reference setting unit 144 includes a first connection unit 1441 and a first execution unit 1442. The first setting unit 114 is electrically connected to the first data pin D1 and the second data pin D2 for receiving from the external electronic device. 20 provides the data signal. Wherein the data signal comprises a reference current. The first setting unit 1441 outputs the first setting signal to the first executing unit 1442 according to the data signal. The first executing unit 1442 is electrically connected to the first setting unit 1441 and the second adjusting unit 142, and the first executing unit 1442 outputs the adjusting voltage Vadj according to the first setting signal. The adjustment voltage Vadj corresponds to the reference current. In this embodiment, the corresponding representation refers to a proportional relationship, that is, there is a certain ratio relationship between the adjustment voltage Vadj and the reference current, and the ratio is a resistance value.

In this embodiment, the first setting unit 1441 is a micro processing integrated circuit (MCU) for receiving a data signal from the first data pin D1 and the second data pin D2, and the data signal is The digital form is transmitted to the first execution unit 1442; the first execution unit 1442 is a digital potentiometer for converting the data signal in digital form into an adjustment voltage Vadj in the form of an analog signal.

The second adjustment unit 142 includes a second comparator COMP2 and a second loop compensation unit Gf2. The second comparator COMP2 includes a second positive input terminal IN3, a second inverting input terminal IN4 and a second comparison output terminal CO2, and the second positive phase input terminal IN3 is electrically connected to the first execution unit 1442 for receiving The adjustment voltage Vadj, the second inverting input terminal IN4 is electrically connected to the current sampling unit 1411 to receive the sampling voltage Vi, and the second comparison output terminal CO2 is electrically connected to the second switch 143 and is used to output the current. Adjust the signal Si.

The second loop compensation unit Gf2 is electrically connected between the second inverting input terminal IN4 and the second comparison output terminal CO2 for maintaining the operational stability of the second comparator COMP2.

The second switch 143 is electrically connected between the second adjusting unit 142 and the conversion circuit 11 for transmitting the current adjustment signal Si to the conversion circuit 11 when the charging device 10 is in rapid charging. Correspondingly, the conversion circuit 11 can be The current adjustment signal Si adjusts the charging current V to control the charging current to be less than the current threshold Ith.

The second switch 143 includes a third switch control end 1431 and a fourth switch control end 1432. The third switch control end 1431 is electrically connected to the second comparison output terminal CO2. The fourth switch control end 1432 is electrically connected to the optocoupler of the conversion circuit 11. Circuit 114. In this embodiment, the second switch 143 is also a diode, wherein the positive terminal of the diode serves as the fourth switch control terminal 1432, and the negative terminal serves as the third switch control terminal 1431.

When the voltage of the fourth switch control end 1432 is greater than the third switch control end 1431, the second switch 143 is in an on state, and the third switch control end 1431 and the fourth switch control end 1432 are electrically conductive; When the voltage of the fourth switch control terminal 1432 is smaller than the third switch control terminal 1431, the second switch 143 is in an off state, and the third switch control terminal 1431 and the fourth switch control terminal 1432 are electrically disconnected.

The operation of the charging device 10 will now be specifically described with reference to FIG.

When the electronic device 20 receives the user's setting operation and needs to perform normal charging, the charging control circuit 22 in the electronic device 20 operates, and the switching circuit 23 is turned off, and the electronic device 20 passes through the first interface to the output interface 12 and the output interface 12. The four data pins output a higher value of the adjustment voltage Vadj, whereby the positive phase potential of the second comparator COMP2 is higher, so that the second comparator COMP2 outputs a high potential current adjustment signal Si, and the second switch 143 is turned off. State, whereby the current detection control unit 14 does not participate in the adjustment of the conversion circuit 11. The voltage detection control unit 13 detects the obtained first detection voltage Vs in real time according to the voltage sensing circuit 131, and compares the first detection voltage Vs with the reference voltage Vref. When the first detection voltage Vs is greater than the reference voltage Vref, When the charging voltage V is greater than the voltage threshold Vth, the first comparator COMP1 outputs a low-potential voltage adjustment signal Sv to the conversion circuit 11, thereby adjusting, by the optocoupler circuit 114, the charging voltage V output by the isolation counter-attack circuit 110, that is, decreasing. The output charging voltage V.

When the electronic device 20 receives the user's setting operation and needs to perform fast charging, the charging control circuit 22 in the electronic device 20 is suspended, and the switching circuit 23 is in an active state, and the electronic device 200 passes through the connection interface 21 and the output interface 12 The first to fourth data pins output the actual demand value and represent the data signal of the reference current. The first setting unit 1441 cooperates with the first executing unit 1442 to convert the data signal into a corresponding adjustment voltage Vadj, wherein the adjustment voltage Vadj represents The reference current required by the user.

Since the first power pin Vbus in the output interface 12 of the electronic device 20 is directly electrically connected to the energy storage unit 24, the charging voltage V transmitted by the first power pin Vbus is also accompanied by the energy storage unit 24. The voltage changes and is less than the saturation voltage of the energy storage unit 24 (the battery is fully charged) High voltage), then, the positive phase potential of the first comparator COMP1 is higher, so that the second comparator COMP1 outputs a high potential voltage adjustment signal Si, and the first switch 133 is in an off state, thereby, voltage detection control Unit 13 does not participate in the adjustment of the conversion circuit 11.

The current detection control unit 14 detects the obtained sampling voltage Vi in real time according to the current sensing circuit 141, and compares the sampling voltage Vi with the adjustment voltage Vadj. When the sampling voltage Vi is greater than the adjustment voltage Vadj, that is, when the charging voltage V is greater than the voltage threshold Ith, the second comparator COMP1 outputs a low-potential current adjustment signal Si to the conversion circuit 11, so that the second switching unit 143 is turned on, thereby The charging voltage V outputted by the isolation counter-attack circuit 110 is adjusted by the optocoupler circuit 114, that is, the output charging current I is lowered.

It can be understood that the larger the value setting for the reference current, the larger the charging current I.

Compared with the prior art, the voltage sensing control unit 13 and the current sensing control unit 14 respectively perform normal charging and fast charging, and the charging voltage V outputted by the output interface 12 is fixed and the charging current I is small due to normal charging. The voltage sensing control unit 13 controls the charging voltage to prevent it from exceeding the voltage threshold Vth; and since the charging current I is large during rapid charging, and the charging voltage V changes at any time, the point voltage sensing control unit 13 continues to be used at this time. The change of the charging current I cannot be accurately obtained, and the change of the charging voltage V is inconvenient to the detection and control of the voltage sensing control unit 13. However, the present invention uses the current by suspending the detection control of the voltage sensing control unit 13. The detection control unit 14 adjusts the output of the conversion circuit 11 by detecting the charging current outputted by the output interface 12 in real time and the reference current provided by the electronic device 20, thereby ensuring that the charging current I can be stabilized and less than the current threshold Ith, thereby preventing the electronic device 20 from passing through. Charging phenomenon.

The principles and embodiments of the present invention are described herein with reference to specific examples. The description of the above embodiments is only for the purpose of understanding the core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, There is a change in the scope of the present invention and the scope of the application, and the contents of the present specification should not be construed as limiting the invention.

Claims

A charging device, comprising:

a conversion circuit for receiving an alternating current signal and converting it into a direct current signal,

An output interface electrically connected to the conversion circuit and an external electronic device, configured to transmit the DC signal to the external electronic device, where the DC signal comprises a charging voltage and a charging current;

a voltage sensing control unit electrically connecting the output interface and the conversion circuit, the voltage sensing control unit detecting the charging voltage and outputting a voltage adjustment signal to the conversion circuit according to the detection voltage to correspondingly control the The charging voltage is less than the voltage threshold;

a current sensing control unit electrically connecting the output interface and the conversion circuit, the current sensing control unit detecting the charging current and outputting a current adjustment signal to the conversion circuit according to the detection current, and correspondingly controlling the charging The current is less than a current threshold, wherein the voltage sensing control unit outputs a corresponding voltage adjustment signal and current adjustment signal when the current sensing control unit is different from the current sensing control unit.
The charging device according to claim 1, wherein the output interface comprises a first power pin, a first ground pin, a first data pin and a second data pin, and the first power pin and the The first ground pin is configured to transmit the charging voltage and the charging current, and the first data pin and the second data pin are used for transmitting a data signal, and the first capacitor is electrically connected to the first The voltage sensing control unit includes a voltage sensing circuit, a first adjusting unit, and a first switch, and the voltage sensing circuit is electrically connected to the first power pin and the ground. Between the ends, for detecting the charging voltage and outputting a first detection voltage; the first adjusting unit is electrically connected to the voltage sensing circuit and the first switch, and the first adjusting unit is configured according to the first Detecting a voltage output voltage adjustment signal, the first switch is electrically connected between the first adjustment unit and the conversion circuit, and the first switch is configured to transmit the voltage adjustment signal to the device during normal charging Transformation a circuit, the conversion circuit adjusting the charging voltage according to the voltage adjustment signal to control the charging voltage to be less than the voltage threshold.
The charging device according to claim 2, wherein the voltage sensing circuit comprises a detection voltage output terminal, a first voltage dividing resistor and a second voltage dividing resistor, wherein the first voltage dividing resistor is electrically connected to the Between the first power supply pin and the detection voltage output terminal, the second voltage dividing resistor is electrically connected between the detection voltage output terminal and the ground terminal, and the detection voltage output terminal is electrically connected The first adjustment unit is configured to output the first detection voltage to the first adjustment unit.
The charging device according to claim 3, wherein the first adjusting unit comprises a first comparator and a first loop compensation unit, and the first comparator comprises a first positive phase input end, a first reverse a phase input terminal and a first comparison output terminal, the first positive phase input terminal is electrically connected to the first reference voltage source to receive the first reference voltage, and the first inverting input terminal is electrically connected to the detection voltage output terminal Receiving the first detection voltage, the first comparison output is electrically connected to the first switch and is used to output the voltage adjustment signal, and the loop compensation unit is electrically connected to the first inversion input Between the end and the first comparison output, for maintaining the first comparator operating stability.
The charging device according to claim 4, wherein the first switch comprises a first switch control end and a second switch control end, and the first switch control end is electrically connected to the first comparison output end, The second switch control end is electrically connected to the conversion circuit. When the voltage of the second switch control end is greater than the first switch control end, the first switch is in an on state, and the first switch is controlled. The terminal is electrically connected to the second switch control terminal, and the voltage adjustment signal is transmitted to the conversion circuit; when the voltage of the second switch control terminal is less than the first switch control terminal, the first switch is in an off state And the first switch control end is electrically disconnected from the second switch control end.
The charging device according to any one of claims 2 to 5, wherein the current sensing control unit comprises: a current sensing circuit, a second adjusting unit, a reference setting unit, and a second switch, wherein

The current sensing circuit is electrically connected between the first power pin and the first ground, for detecting the charging current and outputting a sampling voltage representing a detected current;

The reference setting unit is electrically connected to the first data pin and the second data pin, and is configured to output an adjustment voltage representing a reference current to the second adjustment unit according to the data signal;

The second adjusting unit is electrically connected to the current sensing circuit, the reference setting unit, and the second switch, and the second adjusting unit outputs a current adjustment signal according to the adjusted voltage and the sampling voltage;

The second switch is electrically connected between the second adjusting unit and the conversion circuit for transmitting the current adjustment signal to the conversion circuit during fast charging;

The conversion circuit adjusts the charging current according to the current adjustment signal to control the charging current to be less than a current threshold.
The charging device according to claim 6, wherein said current sensing circuit comprises a first detecting resistor and a current sampling unit, wherein the first detecting resistor is configured to load the charging current, the first detecting resistor includes a first conductive end and a second conductive end, and the first conductive end passes the first a capacitor is electrically connected to the first power pin, the second conductive end is electrically connected to the first ground pin, and the current sampling unit is electrically connected to the first conductive end and the second conductive And a sampling voltage obtained by loading the charging current by the first detecting resistor, where the sampling voltage corresponds to the detecting current.
The charging device according to claim 7, wherein the reference setting unit comprises a first setting unit and a first execution unit, the first setting unit electrically connecting the first data pin and the first a data pin for receiving data signals provided from the electronic device, the data signal including a reference current, and outputting a first setting signal according to the data signal, the first execution unit electrically connecting the first setting And a second adjusting unit, the first executing unit outputs an adjusting voltage according to the first setting signal, where the adjusting voltage corresponds to the reference current.
The charging device according to claim 7, wherein said first setting unit is a micro processing integrated circuit, and said first execution unit is a digital potentiometer.
The charging device according to claim 9, wherein said second adjusting unit comprises a second comparator and a second loop compensation unit, said second comparator comprising a second positive phase input terminal and a second reverse phase a phase input terminal and a second comparison output terminal, the second positive phase input terminal is electrically connected to the first execution unit for receiving the adjustment voltage, and the second inverting input terminal is electrically connected to the current a sampling unit to receive the sampling voltage, the second comparison output is electrically connected to the second switch and configured to output the current adjustment signal, and the second loop compensation unit is electrically connected to the second reverse Between the phase input terminal and the second comparison output terminal, the second comparator is used to maintain operational stability.
The charging device according to claim 10, wherein the second switch comprises a third switch control end and a fourth switch control end, and the third switch control end is electrically connected to the second comparison output end, The fourth switch control terminal is electrically connected to the conversion circuit. When the voltage of the third switch control terminal is greater than the fourth switch control terminal, the second switch is in an on state, and the third switch is controlled. The terminal is electrically connected to the fourth switch control terminal, and the current adjustment signal is transmitted to the conversion circuit; when the voltage of the third switch control terminal is smaller than the fourth switch control terminal, the second switch is in an off state And the third switch control end is electrically disconnected from the fourth switch control end.