CN104901353A - Intelligent charging shunting method of power supply device - Google Patents

Abstract

The invention discloses an intelligent charging shunt method for a power supply device, which includes the following steps. The charger is caused to charge at least one electronic device through a line of the power supply device. Determine whether the charging voltage value of the charger is greater than a predetermined voltage value. When the charging voltage value of the charger is greater than the predetermined voltage value, the current drawn by the battery pack of the power supply device to the charger is increased by an increment amount i.

Description

Intelligent charging shunt method for power supply device

technical field

The present invention relates to a charging control method, in particular to a charging control method that automatically adjusts charging current among multiple power supply devices according to the charging capacity of a charger, and specifically an intelligent charging shunt method for power supply devices.

Background technique

The current charging methods for portable devices, such as tablet computers, mobile phones or power banks, are all charged with a constant voltage and current. Due to the small battery capacity of the portable device in the past, the rated charging current of the charger matched with it is also small. As the battery capacity of a portable device increases, the rated charging current of the accompanying charger also increases. Therefore, there are many chargers on the market that can provide a large current (such as 1500mA, 2000mA or even greater) or a small current (such as below 1000mA). In addition to charging their respective tablet computers and mobile phones, these chargers can also be used to connect to other portable chargers due to the same connection interface (for example, USB, Micro USB or mini USB are currently used as connectors). The power supply unit of the portable device to charge the power supply unit, for example, to charge the mobile power supply.

At present, each power supply unit of a portable device has its maximum acceptable charging current, and each charger also has its maximum charging current. When the power supply unit is being charged, within the maximum charging current acceptable to the power supply unit, the charger will draw the required charging current as much as possible. When the maximum charging current that the charger can provide is not less than the maximum charging current acceptable to the power supply device, the charger enables the power supply device to charge the power supply device with the maximum acceptable charging current. However, when the maximum charging current that the charger can provide is less than the maximum charging current of the power supply unit, that is, when the power supply unit is equipped with a charger with insufficient amperage (for example, the maximum charging current of the power supply unit is 2 amperes, and the charger can only provide 1 ampere. The maximum charging current in amps), it may happen that the power supply unit will continuously try to draw a higher current from the charger than the charger can provide, and the charger will stop charging intermittently due to its own protection mechanism. This whole process causes the instability of the charging process. In some cases, the charger is even forced to provide current to the power supply unit in an over-regulated manner. Although the charger can still provide excess charging current, for the charger, providing such a current has exceeded its internal capacity. The hardware components and circuits are originally designed according to the safety specifications. After long-term use, it is easy to cause damage to the charger hardware or even cause danger.

Contents of the invention

In view of this, in order to improve the above shortcomings, the present invention provides an intelligent charging shunt method, which can preferentially charge the electronic device, and charge the power supply device at the same time within the range of the maximum output current of the charger, so that the charging The charger maintains the maximum charging current it can supply.

According to one embodiment of the present invention, the present invention provides an intelligent charging shunt method, wherein a charger charges a power supply device including a battery pack and at least one electronic device. The smart charging split method includes the following steps. The power supply device detects whether the charger and the at least one electronic device are connected at the same time. The charger is used to charge the at least one electronic device through the line of the power supply device. A charging voltage value of the charger is detected. Judging whether the charging voltage is greater than a predetermined voltage, when the charging voltage of the charger is greater than the predetermined voltage, the current drawn by the battery pack of the power supply device to the charger is increased by an increment i. Wherein, the power supply device can be a mobile power supply.

In one embodiment, the intelligent charging shunt method further includes: repeating the step of judging whether the charging voltage value is greater than a predetermined voltage value, and when it is detected that the charging voltage value of the charger is lower than the predetermined voltage value, the current drawn by the battery pack of the power supply device to the charger is the current i×N at the Nth time.

In one embodiment, in the step of enabling the charger to charge the at least one electronic device, the step of enabling the battery pack of the power supply device to draw current to the charger is executed after a preset time .

In one embodiment, the intelligent charging shunt method further includes: using a current detection unit to detect the charging current of the charger charging the at least one electronic device, and when it is determined that the charging current of the charger charging the at least one electronic device is stable , and then execute the step of making the battery pack of the power supply device draw current to the charger.

In one embodiment, the at least one electronic device includes a first electronic device and a second electronic device, and enables the charger to charge the first electronic device and the second electronic device respectively.

In one embodiment, the intelligent charging shunt method further includes that when the charger is charging the first electronic device via the power supply device, the power supply device detects that it is connected to the second electronic device, causing the battery pack to stop charging the first electronic device. The charger draws current and enables the charger to charge the second electronic device.

In one embodiment, the intelligent charging shunt method further includes using a current detection unit to detect the charging current of the charger for charging the first electronic device and the second electronic device. When the charging current for charging the electronic device is stable, execute the step of making the battery pack of the power supply device draw current to the charger.

In one embodiment, when the number of repetitions is less than or equal to L, the increase i is a first value i ₁ , and when the number of repetitions is greater than L and less than or equal to K, the increase i is a second value i ₂ ; the first value i ₁ is greater than the second value i ₂ ; the sum of L and K is equal to N; and the total increase of the current is L×i ₁ +(KL)×i ₂ . In one embodiment, when the charging current of the charger to charge the at least one electronic device becomes smaller, the battery pack of the power supply device draws a larger current to the charger.

According to an embodiment of the present invention, it is possible to continuously carry out the step-increasing loading procedure of the battery pack to the charging current of the charger, so that when the maximum charging current allowed by the charger is greater than the current required by the electronic device, the mobile power supply The battery pack draws current to the charger. In one embodiment, when the current required by the electronic device drops, the current drawn by the battery pack of the mobile power supply to the charger is increased, so that the charger is always closest to the maximum supply current set by the product designer. With such a design, at the end of the charging process of the electronic device, more current can be additionally distributed to the power supply device, thereby speeding up the charging speed of the power supply device. The intelligent charging shunt method of the power supply device provided by the present invention can allow the power supply device to correctly determine the maximum charging current that the charger can actually provide, and then optimize the charging performance of different chargers under safe use conditions Charge the power supply unit and electronic devices in the same way. Moreover, for portable devices with larger power supply capacity such as mobile power supplies and tablet computers, it is ensured that an optimized charging method can be obtained during charging, so as to shorten the charging time as much as possible.

Description of drawings

FIG. 1 is a schematic flowchart of a method for adjusting a charging current of a power supply device in a power supply device according to the present invention.

FIG. 2 is a functional schematic diagram of a power supply device connected to a charger applying the method in FIG. 1 .

Fig. 3 is a graph showing the variation of charging current value and charging voltage value with time when the method of the present invention is applied.

FIG. 4 is a functional block diagram of an intelligent charging distribution system according to an embodiment of the present invention.

FIG. 5 is a circuit diagram of an example of a charging and discharging control module.

FIG. 6 is a control flow diagram of intelligent charging shunt according to an embodiment of the present invention.

FIG. 7 is a graph of current versus time when charging in constant current mode.

Symbol Description:

10 Power supply unit

11 Charging connector

12 energy storage unit

13 control unit

20 charger

21 output terminal

100 Method for Adjustable Charging Current of Power Supply Unit

110 charger

120 power supply unit

121 Charge and discharge control circuit

122 battery pack

123 Microcontrollers

124 current detection unit

130 microcontrollers

140 electronic devices

211 Discharge control circuit

212 Charging control circuit

Detailed ways

Certain terms are used in the specification and subsequent claims to refer to particular elements. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same element by different terms. This description and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". Furthermore, the terms "coupled" or "connected" herein include any direct or indirect electrical or structural means of connection. Therefore, if it is described in the text that a first device is coupled/connected to a second device, it means that the first device may be directly electrically/structurally connected to the second device, or indirectly electrically/structurally connected through other devices or connection means. connected to the second device.

Please refer to FIG. 1 . FIG. 1 is a schematic flowchart of a method 100 for adjusting a charging current of a power supply device in a power supply device according to the present invention. The power supply device is suitable for connecting an electronic device, and the power supply device can be a mobile power supply, and the electronic device can be a wearable device such as a notebook computer, a tablet computer, a mobile phone, or a smart watch, or a mobile power supply. The steps of the method 100 for modulating the charging current of the power supply device are as follows:

Step 110: setting an initial current value in a power supply device;

Step 120: When a charger is charging the power supply unit, detect a charging voltage value and a charging current value of the power supply unit, and determine whether the charging voltage value is greater than a predetermined voltage value? If so, then perform step 130, if not, then perform step 150;

Step 130: Determine whether the charging current value reaches a maximum current value, and when the charging current value reaches the maximum current value, perform step 170; if the charging current value has not yet reached the maximum current value, perform step 140;

Step 140: increase the charging current value by an increment, and then execute step 160;

Step 150: When the charging voltage value is less than the predetermined voltage value, reduce the charging current value by the increment, and execute step 170;

Step 160: Stop detecting the charging voltage value and the charging current value of the power supply device for a predetermined time, then execute step 120;

Step 170: Charge the power supply device with the updated charging current value or the maximum current value.

Please refer to FIG. 2 , which is a functional schematic diagram of a power supply device connected to a charger using the method in FIG. 1 . In FIG. 2 , the power supply device 10 includes a charging connection terminal 11 , an energy storage unit 12 and a control unit 13 connected between the charging connection terminal 11 and the energy storage unit 12 . The charger 20 is connected to the charging connection terminal 11 to charge the power supply device 10 . The charging connection terminal 11 can use a universal serial port (universal serial bus, USB) as a connector (including USB, Micro USB or mini USB, etc.), and the commonly used charging voltage of USB is 5 volts ± 5%, that is, 4.75 volts ~5.25 volts. In addition, the charging connection port 11 can also adopt other commonly used connection interface specifications, and has a charging voltage range corresponding to the specifications. The energy storage unit 12 is a rechargeable battery, and 18650 battery, lithium ion battery, lithium polymer battery, etc. can be used as the main energy storage unit.

After the charger 20 is connected to the charging terminal 11 of the power supply device 10 , the power supply device 10 can be charged. Wherein the power supply unit 10 is set in advance by the internal control unit 13 or firmware to start charging when the power supply unit 10 is connected to the charger 20 (step 110), and whenever the charger 20 is connected to the power supply unit 10, the power supply unit 10 starts to draw current from the charger 20 at the starting current value, wherein referring to the rated current that the general charger 20 can supply and the charging current of the power supply unit 10, the starting current value can preferably be set to 0.5 ampere or 1 Ampere (A), and then increase the charging current in sequence (such as step 140). However, the initial current value can also be set to 0 ampere, directly start from zero current, and then gradually increase the charging current value in step 140 .

After the initial current value is determined by the control unit 13 or firmware in advance, then when the charger 20 is connected to the charging connection terminal 11 to charge the power supply device 10, the control unit 13 will immediately detect the power supply device 10 at the charging connection terminal 11. A charging voltage value and a charging current value (step 120 ), and the charging voltage value and the charging current value reflect the status of the current output charging voltage and charging current of the charger 20 . In particular, what is detected in step 120 is the data of the charging connection terminal 11 of the power supply device 10, which is not necessarily the same as the charging voltage and charging current output by the output terminal 21 of the charger 20, because the charger 20 and the power supply device There is resistance between the connecting line between 10 and the charger itself, so when obtaining the maximum current available for the charger 20, judging by the charging current and charging voltage at the terminal 10 of the power supply device, the voltage drop caused by the connecting line and the charger itself can be Take them into consideration. Therefore, in step 120, it is determined whether the charging voltage of the power supply device 10 is greater than a predetermined voltage (step 120). For example, if the charging connection terminal 11 uses a USB connection port as described above, the charging and discharging voltage range of the USB connection port should be between 4.75 volts and 5.25 volts, that is, the charging voltage value must be controlled above 4.75 volts (power supply device 10 terminal), in order to perform the charging action in accordance with the USB specification. Here, the predetermined voltage value can be set as 4.75 volts.

When the charging voltage value is greater than the predetermined voltage value, it is determined whether the charging current value reaches the maximum current value acceptable to the power supply device 10 (step 130 ), ie the maximum charging current. In the initial charging stage, the charging current value is the initial current value set in step 110, but has not reached the maximum current value, so step 140 is executed to increase the charging current value by an increment, that is to say, the power supply device 10 Draw current from the charger 20 with a larger charging current value, wherein the increase depends on the design of the charging IC and circuit of the power supply device 10 and can be one of 20 milliamperes, 50 milliamperes, 100 milliamperes, and 200 milliamperes One or other numeric values.

Please also refer to FIG. 3 , which is a time-varying diagram of the charging current value and charging voltage value using the method of the present invention. Since the charger 20 usually charges at a fixed power, the product of the charging current and the charging voltage is fixed. Therefore, when the charging current value is increased in step 140, the charging voltage value (equivalent to the supply voltage of the charger 20) is also decreased accordingly. And the control unit 13 also detects the change of the charging current value and the charging voltage value at any time (step 120 ). In practice, the current change of the charging circuit is accompanied by the voltage change, and there will be a short-term unstable state. Therefore, when the charging current value is increased (step 140), when the charging voltage value fluctuates briefly, the control unit 13 stops. Detect the charging current value and the charging voltage value for a predetermined time (for example, a few seconds) (step 160 ). After the charging voltage value remains stable, obtain the current charging current value and charging voltage value, and continue the judgment of step 120 .

During the process of increasing the charging current value step by step (step 140 ) and decreasing the charging voltage value step by step, then there are two situations. One is that the charging voltage value drops below the predetermined voltage value. Taking the above-mentioned embodiment as an example, that is, when the charging voltage drops to lower than 4.75 volts after the charging current value is increased in step 140 , it exceeds the USB specification. At this time, the control unit 13 reduces the charging current value to the charging current value before the last increment (step 150 ). Since the previous charging voltage value corresponding to the charging current value has not been lower than the predetermined voltage value, the charging current value is the maximum charging current value that the charger 20 can provide. Then, the power supply device 10 is charged with the last charging current value updated in step 150 (step 170).

The second is that during the process of executing the above method, in the process of continuously increasing the charging current value in step 140, none of the charging voltage values detected by the control unit 13 is lower than the predetermined voltage value until the charging current value reaches the maximum value. Current value (step 130). At this time, it means that the charger 20 can provide the maximum charging current required by the power supply device 10 , so the control unit 13 uses the maximum current value as the charging current value to be charged by the charger 20 (step 170 ).

It can be seen from the above-mentioned embodiments that the method for automatically adjusting the charging current of the power supply device of the portable device provided by the present invention is based on the change of the charging current value and the charging voltage value measured at any time by the control unit or firmware of the power supply device. The method of gradually increasing the charging current value enables the power supply device to correctly judge the maximum charging current that the charger can provide under the safety condition of not excessively drawing the current of the charger and causing the charging voltage to be too low. All devices can charge the power supply unit in a manner that optimizes the charging performance.

In addition, as in the above embodiments, it can be further applied to improve power supply devices. FIG. 4 is a functional block diagram of an intelligent charging distribution system according to an embodiment of the present invention. FIG. 5 is a circuit diagram of an example of a charging and discharging control module. FIG. 6 is a control flow diagram of intelligent charging shunt according to an embodiment of the present invention.

Please refer to FIG. 4 which is a basic block diagram of the present invention. The power supply device 120 includes a charging and discharging control circuit 121 , a battery pack 122 and a microcontroller 123 . The power supply device 120 can be a mobile power supply or a portable device with electric energy. In another embodiment, the power supply device 120 may further include a current detection unit 124 . The charge and discharge control circuit 121 includes a charge control circuit 212 and a discharge control circuit 211 . According to the present invention, it mainly allows the electronic device 140 connected to the output end of the power supply device 120 (i.e., the load at the output end of the mobile power supply) to use the current of the charger 110 preferentially. After the electronic device 140 is stably charged, the microcontroller 123 then Check whether the current used by the electronic device 140 has reached the upper limit of the charger. To judge whether the electronic device 140 is charged stably, if there is no current detection unit 124, it can be determined to be stable charging after waiting for a fixed time; when there is a current detection unit 124, the current detection unit 124 is used to detect the charging current so that the charging Whether the voltage is stable or the charging current is stable can be monitored by the MCU in real time. If the current used by the electronic device 140 has reached the upper limit of the charger, it means that the charger current is insufficient for the device. At this time, the power supply device 120 starts the discharge mechanism to provide the energy required by the device alone or with the charger 110 (however, when the power supply device When 120 is out of power, stop this function so that the power supply device 120 will not discharge. Of course, in an embodiment, this function or step may also be unnecessary). If the current used by the electronic device 140 does not reach the upper limit of the charger, the charging control of the power supply device 120 is activated and the charging current is increased until the charger 110 reaches the upper limit of the current it can provide. During the process, the voltage and/or current change of the charger 110 is constantly monitored to adjust the charging control of the power supply device 120 , so that the energy of the charger 110 can be fully utilized throughout the charging process. The circuit block diagram of charge and discharge control circuit 121 of the present invention, please refer to Fig. (Pulse Width Modulation, PWM) method to control the charge and discharge current, and the control process part please refer to Figure 6.

Hereinafter, the intelligent charging shunt system and method of the present invention will be further described. As shown in FIG. 4 , an intelligent charging distribution system according to an embodiment of the present invention includes a charger 110 , a power supply device 120 and an electronic device 140 .

In one embodiment, when the power supply device 120 detects that both the electronic device 140 and the charger 110 are connected to the power supply device 120, the electronic device 140 is coupled to the charger 110 through a circuit in the power supply device 120, and the charger 110 To charge the electronic device 140 , at this time, for example, the electronic device 140 draws a current Ie to the charger 110 .

Subsequently, the battery pack 122 of the power supply unit 120 is in a step-by-step manner, each increment is the current i, and the charger 110 is pumped with a current Ib, so as to charge the battery pack 122 of the power supply unit 120, and the microcontroller of the power supply unit 120 123 detects the charging voltage of the charger 110 at the same time. When it is detected that the charging voltage of the charger 110 is greater than a preset voltage such as 4.75V, the battery pack 122 increases the current Ib drawn by the charger 110 by increasing the current i. At the N+1th time in the stepping mode, the current Ib drawn by the battery pack 122 to the charger 110 is i×(N+1), and it is detected that the charging voltage value of the charger 110 is less than or equal to a preset Voltage, for example, when 4.75 volts, then stop increasing the amount of current pumped by the charger 110, and make the amount of current pumped by the battery pack 122 on the charger 110 return to the amount at the Nth time in the stepping mode, also That is, the current Ib drawn by the battery pack 122 to the charger 110 is i×N.

It can be known from the foregoing manner that the maximum supply current of the charger 110 is Icmax=Ie+i*N. According to this method, the charger 110 can preferentially provide the charging current Ie of the electronic device 140 , and can also provide the maximum charging current Ib=i*N of the battery pack 122 . Therefore, according to this embodiment, the maximum supply current Icmax that the charger 110 can provide can be fully utilized to accelerate the charging speed of the power supply device 120 .

In addition, in the early stage of charging the electronic device 140 , the current Ie drawn by the electronic device 140 to the charger 110 is not a stable value. Therefore, in an embodiment, the power supply device 120 may further include a current detection unit 124 . The current detection unit 124 detects the current or voltage of the circuit between the charger 110 and the electronic device 140. When the current Ie of the circuit between the charger 110 and the electronic device 140 is a stable value, the current detection unit 124 can send a current stabilization signal Sc , to notify the microcontroller 123 that the electric device 140 draws the current Ie to the charger 110 to be a stable value. After receiving the current stabilization signal Sc, the microcontroller 130 activates the charging control circuit 212 to start the process of the battery pack 122 pumping current to the charger 110 .

In an embodiment, the current detection unit 124 may not be included. Instead, after the electronic device 140 starts to draw current to the charger 110, the microcontroller 123 starts the timing function, and when the microcontroller 123 detects that a predetermined time Tc has passed, the charging control circuit 212 is started again, and the charging of the battery pack is started. 122 Step-increasing pumping program for the charger 110 pumping current.

In addition, when the electronic device 140 is in the charging process, it may change from the constant current mode (Constant Current, CC mode) to the constant voltage mode (Constant Voltage, CV mode) according to design specifications, and the electronic device 140 pumps the charger 110 in the CV mode. The value of the current Ie will gradually decrease. Since the power supply device 120 can start the procedure of detecting the maximum charging current of the charger 110 at intervals Ti during the charging process, the charger 110 can continuously provide the maximum charging current. For example, when the current drawn by the electronic device 140 to the charger 110 changes from Ie to Iemin, the current provided by the charger 110 is Ic=Iemin+i×N. Since Iemin is smaller than Ie, the charging current Ic (Iemin+i×N) at this time is not the maximum charging current. At this time, the battery pack 122 of the power supply device 120 can also draw current to the charger 110 in a step-by-step manner, increasing by the current i each time. When it is the M+1th time in the stepping mode, the current Ib drawn by the battery pack 122 to the charger 110 is i×(N+M+1), and it is detected that the charging voltage value of the charger 110 is less than or equal to When a preset voltage is, for example, 4.75 volts, stop increasing the amount of current pumped by the charger 110, and make the amount of current pumped by the battery pack 122 on the charger 110 return to the amount at the Mth time in the stepping mode , that is, the current Ib drawn by the battery pack 122 to the charger 110 is i×(N+M). The maximum supply current of the charger 110 is Icmax=Iemin+i×(N+M). However, the present invention is not limited to adjusting the current value of Ib in a stepwise manner when Ie=Iemin; After the time Tc, it is detected whether the charging current value Ic of the electronic device 140 decreases, and when the Ic continues to decrease for a period of time, the Ib is adjusted in a stepwise manner.

In one embodiment, after finding out Icmax in a stepwise manner, the microcontroller 123 of the power supply unit 120 can record the current value of Icmax, and make the value of Ie+Ib be Icmax during the entire charging process, that is, , when the electronic device 140 is charged into CV mode, Ie will gradually decrease, while Ib will gradually increase.

In one embodiment, the power supply device 120 may also include multiple discharge connection ports for connecting multiple electronic devices 140. For example, the first electronic device 140 draws a current of Ie1 to the charger 110, and the second electronic device 140 draws a current to the charger 110. If the current drawn by the charger 110 is Ie2, then the total current drawn by the electronic device 140 to the charger 110 is Ie=Ie1+Ie2. Both the currents Ie1 and Ie2 may change with time and gradually decrease. According to the present invention, it is possible to continuously monitor the charging voltage of the charger 110 during the charging process, and when it is detected that the charging voltage value of the charger 110 is greater than a preset voltage such as 4.75 volts, the battery pack 122 is then pumped to the charger 110. The loaded current Ib increases the current i. When in the L+1th time in the stepping mode, the current Ib drawn by the battery pack 122 to the charger 110 is i×(L+1), and it is detected that the charging voltage value of the charger 110 is less than or equal to a predetermined value. When the voltage is for example 4.75 volts, then stop increasing the amount of current drawn by the battery pack 122 to the charger 110, and make the amount of current drawn by the battery pack 122 to the charger 110 return to the Lth time of the step mode The amount, that is, the current Ib drawn by the battery pack 122 to the charger 110 is i×L. The maximum supply current of the charger 110 is Icmax=Ie1+Ie2+i×L.

In one embodiment, when the charger 110 charges the first electronic device 140 through the power supply device 120, and the power supply device 120 detects that it is connected to the second electronic device 140, the power supply device 120 can make the battery pack 122 Stop drawing current to the charger 110 , then restart the charging control circuit 212 , and start a step-increasing drawing procedure for the battery pack 122 to draw current to the charger 110 . In one embodiment, when the current detection unit 124 detects that Ie1+Ie2 is a stable value, or after a predetermined time has elapsed, the step-increasing loading procedure for the battery pack 122 to draw the charger 110's current can be started. . In the initial stage, the supply current of the charger 110 changes from Icmax=Ie1+i×L to Ic=Ie1+Ie2+i. When it is detected that the charging voltage of the charger 110 is greater than a preset voltage such as 4.75 volts, the current Ib drawn by the battery pack 122 to the charger 110 is further increased by a current i. When in the K+1th time in the stepping mode, the current Ib drawn by the battery pack 122 to the charger 110 is i×(K+1), and it is detected that the charging voltage value of the charger 110 is less than or equal to a predetermined value. When the voltage is for example 4.75 volts, then stop increasing the amount of current pumped by the battery pack 122 to the charger 110, and make the amount of current pumped by the battery pack 122 to the charger 110 return to the Kth time in the step mode The amount, that is, the current Ib drawn by the battery pack 122 to the charger 110 is i×K. The maximum supply current of the charger 110 is Icmax=Ie1+Ie2+i×K.

In addition, in one embodiment, when the charger 110 charges the first electronic device 140 through the power supply device 120, and the power supply device 120 detects that it is connected to the second electronic device 140, the battery pack 122 is gradually reduced. The charger 110 is pumped current until it is detected that the charging voltage of the charger 110 is greater than a preset voltage, so as to detect the maximum charging current of the charger 110 . In one embodiment, the current drawn by the battery pack 122 to the charger 110 can also be reduced by half or a larger fixed value, and then the charging voltage of the charger 110 can be detected. When it is detected that the charging voltage of the charger 110 is greater than a preset voltage such as 4.75 volts, a step-increasing loading procedure for the battery pack 122 to draw current from the charger 110 is started. When it is detected that the charging voltage value of the charger 110 is less than or equal to a preset voltage such as 4.75 volts, the current drawn by the battery pack 122 to the charger 110 is continuously reduced by half or a larger fixed value until the charging voltage is detected. After the charging voltage value of the charger 110 is greater than a predetermined voltage such as 4.75 volts, the step-increasing loading procedure of the battery pack 122 to the charger 110 is started.

According to an embodiment of the present invention, since the charging voltage of the charger 110 is continuously monitored, the status of the supply current of the charger 110 can be continuously known, so that the supply current of the charger 110 can be kept in a state of providing the maximum charging current.

It should be understood that the "maximum charging current" referred to in this manual may be the maximum current that the product itself can physically provide, or it may be set according to product design, use environment, user habits, etc. That is to say, the maximum charging current can be determined after the preset voltage is determined, which is not necessarily the maximum current that the product itself can physically provide. For example, the commonly used USB charging voltage is 5 volts ± 5%, that is, between 4.75 volts and 5.25 volts. Therefore, for example, the preset voltage can be set to 4.75 volts to obtain the physical or theoretical maximum charging current in the USB specification, but sometimes the charger 110 may be pumped due to various factors such as process factors or usage conditions. Too much current makes the charger 110 unable to load. For a more conservative situation, the preset voltage can also be set to 5.25 volts.

In addition, although according to the USB specification, when the preset voltage is set to 4.75 volts, the physical or theoretical maximum charging current in the USB specification can be obtained, but if the user or product development and design, hope to have a little more buffer space for the power supply device, The preset voltage can also be set to, for example, 4.8 volts or 4.9 volts. In addition, in one embodiment, the preset voltage can also be set to 4.75 volts in advance, but at the N+1th time in the stepping mode, the current Ib drawn by the battery pack 122 to the charger 110 is i×( N+1), and when it is detected that the charging voltage value of the charger 110 is less than or equal to 4.75 volts of a preset voltage, stop increasing the amount of current pumped by the charger 110, and make the battery pack 122 pump the charger 110 The amount of current carried is returned to i×N-Ibuff, wherein the current Ibuff can be set according to product design, user habits or use environment. In this embodiment, the maximum charging current set by the user is: Icmax=Ie+i×N−Ibuff.

In addition, in the above-mentioned embodiments, the value of the current increase i in the step-by-step manner mentioned above is a fixed value. However, the present invention is not limited thereto, and may be a non-fixed value. For example, for example, the increase i in the first stage adopts the first value i ₁ , and the increase i in the second stage adopts the second value i ₂ , wherein i ₁ is greater than i ₂ . In such a situation, the stepping speed can be accelerated in the initial stage, and the fine-tuning stage can be carried out in the second stage to obtain the maximum charging current in an asymptotic manner.

FIG. 7 is a graph of current versus time when charging in constant current mode. As shown in the curve Curve L of FIG. 7 , when the electronic device 140 is charged, the current drawn by the electronic device 140 begins to decrease at about 98 minutes, and the drawn current maintains at about 125mA at about 175 minutes. The time from about 98 minutes to about 175 minutes can be regarded as a stage when the battery of the electronic device 140 is about to be fully charged but not yet fully charged. Usually, the battery of the electronic device 140 is considered to be fully charged when the pumping current is maintained at a full preset value. The full default value can be set according to product specification, user preference and usage environment. In about 98 minutes, the current drawn by the electronic device to the charger decreases, that is, Ie decreases, so the charger 110 still has enough space to provide current to the power supply device 120 .

According to this embodiment, the step-increasing loading procedure of the battery pack 122 to the charger 110 can be continuously carried out, so that when Ie drops, the current Ib that the battery pack 122 draws to the charger 110 is increased, so that the charging The device 110 is always at the maximum supply current Icmax set by the product designer. With such a design, at the end of the charging procedure of the electronic device 140 , more current can be distributed to the power supply device 120 , thereby speeding up the charging speed of the power supply device 120 .

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the application scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. an intelligent charge shunt method for supply unit, described method includes:

Described supply unit detects and connects a charger and at least one electronic installation simultaneously;

Described charger is charged to described at least one electronic installation via the circuit of described supply unit;

One charging voltage value of the charger described in detection; And

Whether the charging voltage value described in judgement is greater than a scheduled voltage, when the charging voltage value described in described charger is greater than described scheduled voltage, make the described battery pack of described supply unit take out the electric current carried to described charger, then increase by a recruitment i.

2. the intelligent charge shunt method of supply unit as claimed in claim 1, more comprise: whether the charging voltage value described in the judgement described in repetition is greater than the step of a scheduled voltage, when the charging voltage value detecting described in described charger when in the N+1 time is less than described scheduled voltage, the described battery pack of described supply unit is made to take out the electric current carried to described charger, the total recruitment i × N of electric current when being the N time.

3. the intelligent charge shunt method of supply unit as claimed in claim 1, wherein, the described step that described charger is charged to described at least one electronic installation, after being executed in a Preset Time, the more described battery pack of described supply unit that makes described in performing takes out current-carrying step to described charger.

4. the intelligent charge shunt method of supply unit as claimed in claim 1, more comprise: utilize one current detecting unit detect described in charger to the charging current of described at least one charge electronic devices, when the charger described in judging to the charging current of described at least one charge electronic devices as stablizing time, then perform described in the described battery pack of described supply unit that makes current-carrying step is taken out to described charger.

5. the intelligent charge shunt method of supply unit as claimed in claim 1, wherein said at least one electronic installation comprises one first electronic installation and a second electronic device, and described charger is charged to the first described electronic installation and described second electronic device respectively.

6. the intelligent charge shunt method of supply unit as claimed in claim 5, more to comprise when described charger across described supply unit in the process of the first described charge electronic devices, when described supply unit detects that it is connected to described second electronic device, make described battery pack stop taking out live stream to described charger, and described charger is charged to described second electronic device.

7. the intelligent charge shunt method of supply unit as claimed in claim 6, more to comprise when described charger across described supply unit in the process of the first described charge electronic devices, when described supply unit detects that it is connected to described second electronic device, make described battery pack stop taking out live stream to described charger, and described charger is charged to described second electronic device.

8. the intelligent charge shunt method of supply unit as claimed in claim 7, more comprise: utilize a current detecting unit, the charging current that charger described in detection charges to the first described electronic installation and described second electronic device, when the charging current that the charger described in judging charges to the first described electronic installation and described second electronic device is as stablizing, the more described battery pack of described supply unit that makes described in performing takes out current-carrying step to described charger.

9. the intelligent charge shunt method of supply unit as claimed in claim 2, the recruitment i described in wherein when number of repetition is less than or equal to L is the first value i ₁, and the recruitment i described in when number of repetition is greater than L and is less than or equal to K is the second value i ₂;

The first described value i ₁be greater than the second described value i ₂;

The summation of L and K equals N; And

The total recruitment L × i of described electric current ₁+ (K-L) × i ₂.

10. the intelligent charge shunt method of supply unit as claimed in claim 1, wherein when described charger diminishes to the charging current that described at least one electronic installation charges, the described battery pack of described supply unit takes out to described charger that to carry ER effect large.