CN104253461B - A kind of charger and the method for supplying power to of charger - Google Patents

Abstract

The embodiment of the invention discloses a kind of charger, including a voltage compensation module；Described voltage compensation module includes: testing circuit, is used for detecting the charging voltage of the charging end of the output voltage of the voltage output end of charger and incoming terminal equipment, compares and obtain described output voltage and the difference of described charging voltage；Compensate circuit, for calculating the sum of the described difference of described output voltage and 2 times, the output voltage after being compensated；Switching Power Supply, for regulating the output voltage of described charger so that described output voltage is equal to the output voltage after described compensation.The embodiment of the present invention also provides for the charging method of a kind of charger.Use the embodiment of the present invention, it is possible to solve the problem that in the charge cable of charger, pressure drop is excessive, it is ensured that the charging current of the rechargeable battery of terminal unit is constant, thus improves charge efficiency, reduce the charging interval.

Description

A charging device and a power supply method for the charging device

technical field

The invention relates to the technical field of terminal power supply, in particular to a charging device and a power supply method for the charging device.

Background technique

End devices generally use rechargeable batteries to provide power. Rechargeable batteries need to be replenished regularly, and the power required for charging is generally converted by the charger to 220V AC.

As shown in FIG. 1 , it is a working principle diagram of a charger in the prior art. In the prior art, the charger 1a converts 220V AC power into 5V DC voltage, outputs it to the terminal device 3a through the USB connection line 2a, and charges the rechargeable battery of the terminal device 3a.

Since the USB connection line 2a has a certain resistance value, for the prior art shown in FIG. 1 , when the charging current is large, the voltage loss on the USB connection line 2a is relatively large. For example, assuming that the charging current is 2A, the one-way resistance of the USB connection line 2a is 0.17 ohm (the unit of resistance is ohm). When the charger 1a outputs a standard voltage of 5V, the voltage of the charger shown in Figure 1 drops to: 5V-2×0.17ohm×2A=4.32V when it reaches the terminal device 3a. The voltage required by the rechargeable battery of the terminal device 3a is generally relatively high, and can reach about 4.2V at the highest, and the chip of the rechargeable battery needs a certain voltage difference to maintain a constant current.

Therefore, in the charger of the prior art, due to the excessive voltage loss of the charging line (USB connection line 2 a ), the voltage difference of the chip of the rechargeable battery may be insufficient, and the charging current will become smaller and smaller, which cannot be kept constant. In this way, both the charging efficiency is reduced and the charging time is increased.

Contents of the invention

Embodiments of the present invention provide a charging device and a power supply method for the charging device, which can solve the problem of excessive voltage drop on the charging cable of the charging device, ensure that the charging current of the rechargeable battery of the terminal device is constant, thereby improving the charging efficiency and reducing the charging time.

In a first aspect, a charging device is provided, the voltage output terminal of the charging device is used to connect to the charging terminal of the terminal device through the charging cable; the charging device includes a voltage compensation module;

The voltage compensation module includes: a detection circuit, a compensation circuit and a switching power supply;

The detection circuit is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage reaching the charging terminal of the terminal device, and compare and obtain the difference between the output voltage and the charging voltage;

The compensation circuit is used to calculate the sum of the output voltage and twice the difference to obtain a compensated output voltage;

The switching power supply is used to adjust the output voltage of the charging device so that the output voltage is equal to the compensated output voltage.

In a first possible implementation manner of the first aspect, the voltage compensation module further includes:

Threshold judging circuit, used to compare the relationship between the compensated output voltage and a preset maximum threshold, if the compensated output voltage is greater than or equal to the maximum threshold, then make the compensated output voltage equal to The highest threshold is then output to the switching power supply.

In combination with the first aspect and the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the charging cable includes: an outer shielding layer and a ground wire;

The end of the ground wire connected to the voltage output end of the charging device is the first end, and the end of the ground wire connected to the charging end of the terminal equipment is the second end;

The second end of the ground wire is short-circuited with the outer shielding layer of the charging cable;

The detection circuit includes: a differential amplifier;

The non-inverting input terminal of the differential amplifier is connected to the first end of the ground wire of the charging cable, the inverting input terminal of the differential amplifier is connected to the outer shielding layer, and the output terminal of the differential amplifier is connected to the compensation cable. the input of the circuit;

The differential amplifier is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage reaching the charging terminal of the terminal device, compare the difference between the output voltage and the charging voltage, and output it to the compensation circuit.

In combination with the first aspect and the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the charging cable includes: an outer shielding layer and a ground wire;

The end of the ground wire connected to the voltage output end of the charging device is the first end, and the end of the ground wire connected to the charging end of the terminal equipment is the second end;

The second end of the ground wire is short-circuited with the outer shielding layer of the charging cable;

The detection circuit includes: an analog-to-digital converter and a microprocessor;

The positive-phase input terminal of the analog-to-digital converter is connected to the first end of the ground wire of the charging cable, the negative-phase input terminal of the analog-to-digital converter is connected to the outer shielding layer, and the The output terminal is connected to the input terminal of the microprocessor;

The analog-to-digital converter is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage of the charging terminal of the terminal device, compare the difference between the output voltage and the charging voltage, and output the The digital signal corresponding to the difference is sent to the microprocessor;

The microprocessor is configured to process the difference and output it to the compensation circuit.

In a second aspect, a method for supplying power to a charging device is provided, the method comprising:

Detecting the output voltage of the charging device and the charging voltage reaching the terminal device, and comparing the difference between the output voltage and the charging voltage;

calculating the sum of the output voltage and twice the difference to obtain a compensated output voltage;

Adjusting the output voltage of the charging device so that the output voltage is equal to the compensated output voltage.

In a first possible implementation manner of the second aspect, after obtaining the compensated output voltage and before adjusting the output voltage of the charging device, the method further includes:

Comparing the relationship between the compensated output voltage and a preset maximum threshold, if the compensated output voltage is greater than or equal to the maximum threshold, making the compensated output voltage equal to the maximum threshold.

Compared with the prior art, the charging device described in the embodiment of the present invention includes a voltage compensation module, which can detect the output voltage of the voltage output terminal of the charging device and the charging voltage actually reaching the charging terminal of the terminal device, through Calculate the difference between the output voltage and the charging voltage to obtain the voltage loss value on the charging cable when the output voltage of the charging device reaches the terminal device, and then compensate the output voltage of the charging device according to the voltage loss value , so that when the compensated output voltage reaches the terminal equipment, the ideal charging voltage value can still be maintained. This can solve the problem of excessive voltage drop on the charging cable of the charging device, ensure the voltage difference of the rechargeable battery of the terminal device, and maintain a constant charging current of the rechargeable battery, thereby improving charging efficiency and reducing charging time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a working principle diagram of a charger in the prior art;

FIG. 2 is a structural diagram of a charging device according to Embodiment 1 of the present invention;

FIG. 3 is a structural diagram of a charging device according to Embodiment 2 of the present invention;

FIG. 4 is a structural diagram of a voltage compensation module according to Embodiment 1 of the present invention;

5 is a structural diagram of a voltage compensation module according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart of a method for supplying power to a charging device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiments of the present invention provide a charging device and a power supply method for the charging device, which can solve the problem of excessive voltage drop on the charging cable of the charging device, ensure that the charging current of the rechargeable battery of the terminal device is constant, thereby improving the charging efficiency and reducing the charging time.

Referring to FIG. 2 , it is a structural diagram of the charging device according to Embodiment 1 of the present invention. As shown in FIG. 2 , the voltage output end of the charging device 10 is used to connect to the charging end of the terminal device 30 through the charging cable 20 to charge the terminal device 30 .

The charging device 10 in the embodiment of the present invention includes a voltage compensation module. The voltage compensation module includes: a detection circuit 101 , a compensation circuit 102 and a switching power supply 103 .

Wherein, the output terminal of the detection circuit 101 is connected to the input terminal of the compensation circuit 102 ; the output terminal of the compensation circuit 102 is connected to the input terminal of the switching power supply 103 .

The detection circuit 101 is configured to detect the output voltage Va of the voltage output terminal of the charging device 10 and the charging voltage Vc reaching the charging terminal of the terminal device 30, and compare the output voltage Va and the charging voltage Vc to obtain difference Vac, and output the difference Vac to the compensation circuit 102 .

The compensation circuit 102 is used to calculate the sum of the output voltage Va and the difference Vac which is doubled to obtain a compensated output voltage Va', and output the compensated output voltage Va' to the Switching power supply 103.

Specifically, Va'=Va+2×Vac.

The switching power supply 103 is used to adjust the output voltage of the charging device 10 so that the output voltage is equal to the compensated output voltage Va'.

The charging device described in the embodiment of the present invention includes a voltage compensation module, which can detect the output voltage Va of the voltage output terminal of the charging device 10 and the charging voltage Vc actually reaching the charging terminal of the terminal device 30, by calculating the The difference between the output voltage Va and the charging voltage Vc can be used to obtain the voltage loss value on the charging cable 20 when the output voltage of the charging device 10 reaches the terminal device 30, and then output the charging device 10 according to the voltage loss value. The voltage is compensated, so that when the compensated output voltage reaches the terminal device 30, the ideal charging voltage value can still be maintained. This can solve the problem of excessive voltage drop on the charging cable of the charging device 10, ensure the voltage difference of the rechargeable battery of the terminal device, and maintain a constant charging current of the rechargeable battery, thereby improving charging efficiency, reducing charging time, and enhancing user experience.

It should be noted that the charging voltage of the rechargeable battery of the terminal device 30 generally has a certain maximum threshold, and when the charging voltage is higher than the maximum threshold, the rechargeable battery may be burned. For example, the ideal charging voltage of the rechargeable battery of the terminal device 30 is generally 5V, and the highest threshold is generally 6V to 6.5V. When the charging voltage exceeds the highest threshold, the rechargeable battery is likely to be burned. In the embodiment of the present invention, if the compensated output voltage Va' exceeds the maximum threshold and is directly output to the terminal device 30, the rechargeable battery is likely to be burned. Embodiment 2 of the present invention can solve this problem.

Referring to FIG. 3 , it is a structural diagram of the charging device described in Embodiment 2 of the present invention. As shown in FIG. 3 , the difference between the charging device in Embodiment 2 of the present invention and Embodiment 1 is that the voltage compensation module of the charging device 10 may further include a threshold judgment circuit 104 .

The threshold judging circuit 104 is used to compare the relationship between the compensated output voltage Va' and a preset maximum threshold, and if the compensated output voltage Va' is smaller than the maximum threshold, output the The compensated output voltage Va' is sent to the switching power supply 103; if the compensated output voltage Va' is greater than or equal to the maximum threshold, the compensated output voltage Va' is equal to the maximum threshold before outputting to the switching power supply 103.

The charging device described in Embodiment 2 of the present invention, on the basis of Embodiment 1, further includes a threshold judging circuit 104, by comparing the relationship between the compensated output voltage Va' and the preset highest threshold, when the When the compensated output voltage Va' is greater than or equal to the preset maximum threshold, the compensated output voltage Va' equal to the maximum threshold is directly output to the switching power supply 103 . This can effectively avoid the phenomenon that the rechargeable battery of the terminal device 30 is burned due to the excessive charging voltage caused by compensation, which is beneficial to ensure the safety of the charging device and enhance the service life of the terminal device 30 .

Referring to FIG. 4 , it is a structural diagram of a voltage compensation module according to Embodiment 1 of the present invention. Figure 4 shows a specific implementation form of the voltage compensation module of the charging device described in Embodiment 1 of the present invention, taking the voltage compensation module shown in Figure 4 as an example, the working principle of the charging device described in the embodiment of the present invention for details.

Under normal circumstances, the charging cable 20 may include: a line group composed of a power line, a ground line, a positive voltage data line and a negative voltage data line, a conductive layer arranged outside the line group, and a conductive layer arranged on the conductive layer. An insulating layer on the outside of the insulating layer, and an outer shielding layer disposed on the outside of the insulating layer. It can be seen from this that the outer shielding layer and each line in the line group are independent of each other. Since the composition of the charging cable 20 is a well-known technology in the art, it will not be described in detail in the embodiment of the present invention.

In the embodiment of the present invention, the end of the ground wire of the charging cable 20 connected to the voltage output end of the charging device 10 is set as the first end, and the end of the ground wire connected to the charging end of the terminal device 30 is set as the first end. One end is the second end.

In the embodiment of the present invention, the second end of the ground wire (that is, the end of the ground wire connected to the charging end of the terminal device 30 ) is short-circuited with the outer shielding layer of the charging cable 20 .

Meanwhile, the detection circuit 101 includes a differential amplifier 1011 . The non-inverting input terminal of the differential amplifier 1011 is connected to the first end of the ground wire (that is, the end of the ground wire connected to the voltage output terminal of the charging device 10), and the inverting input terminal of the differential amplifier 1011 is The terminal is connected to the outer shielding layer; the output terminal of the differential amplifier 1011 is connected to the input terminal of the compensation circuit 102 .

Other parts of the charging device described in the third embodiment of the present invention are the same as those in the first embodiment of the present invention, and will not be repeated here.

The non-inverting input terminal of the differential amplifier 1011 detects the output voltage Va of the voltage output terminal of the charging device 10, and its inverting input terminal detects the charging voltage Vc reaching the charging terminal of the terminal device 30, and obtains by comparison The difference Vac between the output voltage Va and the charging voltage Vc is output to the compensation circuit 102 .

The working principle of the charging device described in Embodiment 3 of the present invention will be described in detail with reference to FIG. 4 .

Specifically, as shown in FIG. 4 , at the end of the charging cable 20 connected to the terminal device 30 , the ground wire of the charging cable 20 is short-circuited with the outer shielding layer of the charging cable 20 . Thus, at the terminal device 30, the voltage of the outer shielding layer is equal to the voltage of the second end of the ground wire; further, since the second end of the ground wire is connected to the charging end of the terminal device 30 Therefore, the voltage of the outer shielding layer at the terminal device 30 is equal to the charging voltage Vc reaching the charging terminal of the terminal device 30 .

Since there is an insulating layer between the outer shielding layer and the line group of the charging cable 20 , no current flows through the outer shielding layer, and the voltage on the outer shielding layer is equal everywhere. At one end of the charging cable 20 of the charging device connected to the charging device 10, the voltage of the outer shielding layer at the charging device 10 end is equal to the voltage of the outer shielding layer at the terminal device 30 end, which is equal to the voltage reaching the charging device 10. The charging voltage Vc of the charging terminal of the terminal device 30 .

At the same time, at the end of the charging cable 20 connected to the charging device 10, the inverting input terminal of the differential amplifier 1011 is connected to the outer shielding layer, therefore, the inverting input voltage of the differential amplifier 1011 is equal to The voltage of the outer shielding layer at the terminal of the charging device 10 is equal to the charging voltage Vc reaching the charging terminal of the terminal device 30 .

However, the non-inverting input terminal of the differential amplifier 1011 is connected to the first terminal of the ground wire, and at the same time, the first terminal of the ground wire is connected to the voltage output terminal of the charging device 10, therefore, the differential amplifier 1011 The positive phase input voltage of is equal to the output voltage Va of the voltage output terminal of the charging device 10 .

The differential amplifier 1011 compares the received positive-phase input voltage and the negative-phase input voltage to obtain the difference between the two, which is the difference Vac between the output voltage Va and the charging voltage Vc, that is, the charging device When the output voltage of 10 reaches the terminal device 30, the voltage loss value on the charging cable 20.

Then, the compensation circuit compensates the output voltage of the charging device 10 according to twice the voltage loss value to obtain the compensated output voltage Va'. For example, the output voltage Va is 5V, and the calculated voltage loss value Vac is 0.1V, then the output voltage after compensation: Va'=5V+2×0.1V=5.2V.

The output voltage of the charging device 10 is adjusted by the switching power supply 103 so that the output voltage is equal to the compensated output voltage Va' (for example, 5.2V). When the output voltage of the charging device 10 is equal to the compensated output voltage Va', when the compensated output voltage Va' reaches the charging terminal of the terminal device 30, after the line loss of the charging cable 20, its The voltage drops to 5V, which is exactly equal to the ideal charging voltage of the terminal device 30 and meets the charging requirement of the terminal device 30 .

In the second embodiment of the present invention, by connecting the second end of the ground wire of the charging cable 20 (that is, the end of the ground wire connected to the charging end of the terminal device 30 ) with the charging cable 20 The outer shielding layer is short-circuited, and the voltage on the outer shielding layer is equal to the charging voltage Vc of the charging terminal of the terminal device 30 by using the principle that the voltage on the outer shielding layer is equal everywhere. The inverting input terminal of the differential amplifier 1011 included in the detection circuit 101 is connected to the outer shielding layer of the charging cable 20 , so that its inverting input voltage is equal to the charging voltage Vc of the charging terminal of the terminal device 30 . At the same time, the positive-phase input terminal of the differential amplifier 1011 is connected to the first terminal of the ground wire (that is, the terminal connected to the voltage output terminal of the charging device 10), and its positive-phase input voltage is The output voltage Va of the voltage output terminal of the charging device 10 . It can be seen from this that the non-inverting input voltage and the inverting input voltage of the differential amplifier 1011 are respectively the voltage at which the ground line is located at the terminal 10 of the charging device and the voltage at which the ground line is located at the terminal device 30 . The positive-phase input voltage and the negative-phase input voltage can be used to obtain the voltage difference between the two ends of the ground wire, which is also the voltage loss value on the charging cable 20 . The output voltage of the charging device 10 is compensated by using the voltage loss value, so that when the compensated output voltage reaches the terminal device 30 , an ideal charging voltage value can still be maintained. This can solve the problem of excessive voltage drop on the charging cable of the charging device, ensure the voltage difference of the rechargeable battery of the terminal device, and maintain a constant charging current of the rechargeable battery, thereby improving charging efficiency, reducing charging time, and enhancing user experience.

Certainly, the charging device described in Embodiment 3 of the present invention shown in FIG. 4 may also further include a threshold judgment circuit.

The threshold judging circuit is used to compare the relationship between the compensated output voltage Va' and a preset maximum threshold, and output the compensated output voltage Va' if the compensated output voltage Va' is smaller than the maximum threshold. The output voltage Va' after compensation is sent to the switching power supply 103; if the output voltage Va' after compensation is greater than or equal to the maximum threshold value, the output voltage Va' after compensation is equal to the maximum threshold value and then output to The switching power supply 103 .

In this embodiment, by comparing the relationship between the compensated output voltage Va' and the preset maximum threshold, when the compensated output voltage Va' is greater than or equal to the preset maximum threshold, the direct output is equal to the preset maximum threshold. The compensated output voltage Va' of the highest threshold is sent to the switching power supply 103 . This can effectively avoid the phenomenon that the rechargeable battery of the terminal device 30 is burned due to the excessive charging voltage caused by compensation, which is beneficial to ensure the safety of the charging device and enhance the service life of the terminal device 30 .

Referring to FIG. 5 , it is a structural diagram of the voltage compensation module described in Embodiment 2 of the present invention. Fig. 5 shows another specific implementation form of the voltage compensation module of the charging device according to the embodiment of the present invention.

The difference between the charging device in the fourth embodiment shown in FIG. 5 and the third embodiment is that the detection circuit 101 includes an analog-to-digital converter 1012 and a microprocessor 1013 .

The positive phase input terminal of the analog-to-digital converter 1012 is connected to the first end of the ground wire (that is, the end where the ground wire 202 is connected to the voltage output end of the charging device 10), and the analog-to-digital converter The inverting input terminal of 1013 is connected to the outer shielding layer; the output terminal of the analog-to-digital converter 1013 is connected to the input terminal of the microprocessor 1013 .

The output terminal of the microprocessor 1013 is connected to the input terminal of the compensation circuit 102 .

Other parts of the charging device described in the fourth embodiment of the present invention are the same as those in the third embodiment of the present invention, and will not be repeated here.

Specifically, the non-inverting input terminal of the analog-to-digital converter 1012 detects the output voltage Va of the voltage output terminal of the charging device 10, and its inverting input terminal detects the charging voltage reaching the charging terminal of the terminal device 30. Vc is obtained by comparing the difference Vac between the output voltage Va and the charging voltage Vc, and outputs a digital signal corresponding to the difference Vac to the microprocessor 1013 .

The microprocessor 1013 performs corresponding processing on the difference Vac, and then outputs it to the compensation circuit 102 .

Compared with the charging device described in Embodiment 3, the advantage of the charging device described in Embodiment 4 is that the difference Vac between the output voltage Va and the charging voltage Vc obtained by comparison can be converted by the analog-to-digital converter 1012 The digital signal is output to the microprocessor 1013 , and a corresponding optimization algorithm is introduced through the microprocessor 1013 to process the difference Vac and then output to the compensation circuit 102 . For example, when the circuit state is not stable at the initial stage of the system, the corresponding delay processing is added to realize gradual adjustment to avoid the problem of adjustment overshoot. Thus, the adjustment of the output voltage of the charging device can be made more stable, ensuring the safety and stability of the charging process for the terminal device 30 .

Of course, the foregoing embodiments only provide two specific implementation forms of the voltage compensation module of the charging device. In practical applications, the voltage compensation module may also be implemented in other circuit forms.

Corresponding to the charging device provided in the embodiment of the present invention, the embodiment of the present invention further provides a power supply method for the charging device. The charging device provides charging power for the terminal device.

Referring to FIG. 6 , it is a flowchart of a method for supplying power to a charging device according to an embodiment of the present invention. As shown in Figure 6, the method may include the following steps:

Step S601: Detect the output voltage Va of the charging device and the charging voltage Vc reaching the terminal device, and compare to obtain a difference Vac between the output voltage Va and the charging voltage Vc.

Step S602: Calculate the sum of the output voltage Va and the doubled difference Vac to obtain a compensated output voltage Va'.

Specifically, Va'=Va+2×Vac.

Step S603: Adjust the output voltage of the charging device so that the output voltage is equal to the compensated output voltage Va'.

In the power supply method for the charging device described in the embodiment of the present invention, the output voltage Va of the charging device and the charging voltage Vc actually reaching the terminal device are detected, and by calculating the difference between the output voltage Va and the charging voltage Vc, it can be obtained When the output voltage of the charging device reaches the terminal device, the voltage loss value on the charging cable is calculated, and then the output voltage of the charging device is compensated according to the voltage loss value, so that when the compensated output voltage reaches the terminal device, it can still Maintain the ideal charging voltage value. This can solve the problem of excessive voltage drop on the charging cable of the charging device, ensure the voltage difference of the rechargeable battery of the terminal device, and maintain a constant charging current of the rechargeable battery, thereby improving charging efficiency, reducing charging time, and enhancing user experience.

It should be noted that the charging voltage of the rechargeable battery of the terminal device generally has a certain maximum threshold, and when the charging voltage is higher than the maximum threshold, the rechargeable battery may be burned. For example, the ideal charging voltage of the rechargeable battery of the terminal device is generally 5V, and the highest threshold is generally 6V to 6.5V. When the charging voltage exceeds the highest threshold, the rechargeable battery is likely to be burned. In the embodiment of the present invention, if the compensated output voltage Va' exceeds the maximum threshold and is directly output to the terminal device, the rechargeable battery may be burned. The following embodiments of the present invention can solve this problem.

Preferably, after step S602 and before step S603, the method described in the embodiment of the present invention may further include: comparing the relationship between the compensated output voltage Va' and a preset maximum threshold, if the compensated output voltage Va' If the output voltage Va' is greater than or equal to the highest threshold, then the compensated output voltage Va' is equal to the highest threshold.

In the above embodiment, by comparing the relationship between the compensated output voltage Va' and the preset maximum threshold, when the compensated output voltage Va' is greater than or equal to the preset maximum threshold, the direct output is equal to the preset maximum threshold. The compensated output voltage Va' of the highest threshold. This can effectively avoid the phenomenon that the rechargeable battery of the terminal device is burned due to the excessively high charging voltage caused by the compensation, which is beneficial to ensure the safety of the charging device and enhance the service life of the terminal device.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (3)

1. A charging device, characterized in that the voltage output terminal of the charging device is used to connect to the charging terminal of the terminal device through the charging cable; the charging device includes a voltage compensation module; The voltage compensation module includes: a detection circuit, a compensation circuit and a switching power supply; The detection circuit is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage reaching the charging terminal of the terminal device, and compare and obtain the difference between the output voltage and the charging voltage; The compensation circuit is used to calculate the sum of the output voltage and twice the difference to obtain a compensated output voltage; The switching power supply is used to adjust the output voltage of the charging device so that the output voltage is equal to the compensated output voltage; The charging cable includes: an outer shielding layer and a ground wire; The end of the ground wire connected to the voltage output end of the charging device is the first end, and the end of the ground wire connected to the charging end of the terminal equipment is the second end; The second end of the ground wire is short-circuited with the outer shielding layer of the charging cable; The detection circuit includes: a differential amplifier; The non-inverting input terminal of the differential amplifier is connected to the first end of the ground wire of the charging cable, the inverting input terminal of the differential amplifier is connected to the outer shielding layer, and the output terminal of the differential amplifier is connected to the compensation cable. the input of the circuit; The differential amplifier is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage reaching the charging terminal of the terminal device, compare the difference between the output voltage and the charging voltage, and output it to the compensation circuit. 2. The charging device according to claim 1, wherein the voltage compensation module further comprises: Threshold judging circuit, used to compare the relationship between the compensated output voltage and a preset maximum threshold, if the compensated output voltage is greater than or equal to the maximum threshold, then make the compensated output voltage equal to The highest threshold is then output to the switching power supply. 3. The charging device according to claim 1 or 2, wherein the charging cable comprises: an outer shielding layer and a ground wire; The end of the ground wire connected to the voltage output end of the charging device is the first end, and the end of the ground wire connected to the charging end of the terminal equipment is the second end; The second end of the ground wire is short-circuited with the outer shielding layer of the charging cable; The detection circuit includes: an analog-to-digital converter and a microprocessor; The positive-phase input terminal of the analog-to-digital converter is connected to the first end of the ground wire of the charging cable, the negative-phase input terminal of the analog-to-digital converter is connected to the outer shielding layer, and the The output terminal is connected to the input terminal of the microprocessor; The analog-to-digital converter is used to detect the output voltage of the voltage output terminal of the charging device and the charging voltage of the charging terminal of the terminal device, compare the difference between the output voltage and the charging voltage, and output the The digital signal corresponding to the difference is sent to the microprocessor; The microprocessor is configured to process the difference and output it to the compensation circuit.