CN115995872A

CN115995872A - Charger module and method for dynamically adjusting bus voltage of charger module

Info

Publication number: CN115995872A
Application number: CN202211454018.XA
Authority: CN
Inventors: 龙海岸; 刘佐勤; 尤晓翔
Original assignee: Ningbo Gongniu Digital Technology Co Ltd
Current assignee: Ningbo Gongniu Digital Technology Co Ltd
Priority date: 2022-11-21
Filing date: 2022-11-21
Publication date: 2023-04-21

Abstract

The invention relates to a charger module, an AC/DC conversion unit converts alternating commercial power voltage into direct current bus voltage and provides the direct current bus voltage to a DC/DC conversion unit, the DC/DC conversion unit converts the bus voltage into output voltage provided for a receiving device, a micro control unit samples actual charging voltage of the receiving device when detecting that the receiving device is connected to an output port of the charger module, judges whether the maximum value of the sampled actual charging voltage of the receiving device is larger than a preset voltage value, and when judging that the maximum value of the actual charging voltage of the receiving device is larger than the preset voltage value, the micro control unit controls a reference voltage adjustment unit to act so as to change reference voltage on an anode of a feedback voltage stabilizer, and the bus voltage adjustment unit controls so as to change the bus voltage according to the change of the reference voltage, so that the output voltage of the DC/DC conversion unit can reach the maximum value of the actual charging voltage of the receiving device.

Description

Charger module and method for dynamically adjusting bus voltage of charger module

Technical Field

The invention relates to a charger module and a method for dynamically adjusting bus voltage of the charger module.

Background

With the great improvement of the delivery of electronic devices such as mobile phones and tablet computers, the demands of people on quick charge and multi-port output of the electronic devices are increasing, the share of multi-port output quick charge is steadily improved, and various large-brand manufacturers also push out small-size multi-port output quick charge chargers to meet the demands of users. However, the multi-port output charge fast charge may have the following problems: such as severe heat generation, low power conversion efficiency, still slow charging speed, etc.

As one prior art (first prior art), the following is known: after the fast charger is connected to 220V mains supply, the bus voltage of the secondary output of the AC/DC conversion unit is a fixed value (the bus voltage is 30V or 60V or more), and then the bus voltage is converted into sub-line voltages of 5V, 12V, 20V, etc. by a plurality of DC/DC conversion units according to the read protocol, and is output to the electronic device for charging.

However, in the first prior art, since the bus voltage is a fixed value, when the bus voltage is converted into a low DC sub-line voltage, the crossover loss is large, which causes the temperature of devices such as a switching tube and an inductor to increase, and causes the on-resistance to increase, which causes the DC/DC conversion efficiency of the fast charging charger to decrease, and this is particularly obvious when charging at the same time with a multi-port low voltage.

Further, as another prior art (second prior art), the following is also known: 220V commercial power is respectively supplied to the plurality of AC/DC conversion units and then directly supplied to each port for use, and the output ports are not affected by each other.

However, in the above second prior art, the quick charger is high in manufacturing cost, large in volume, and small in adjustable range of the output voltage of each port, and the output power of a single port is small.

Disclosure of Invention

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a charger module that can dynamically adjust the magnitude of a bus voltage according to the protocol requirements of a power receiving device when it is detected that the power receiving device is connected to an output port of the charger module, so that the bus voltage can be adjusted to be close to the output voltage of a DC/DC conversion unit, thereby greatly reducing conversion loss while suppressing the cost and volume of a charger product, improving DC/DC conversion efficiency and reducing the heat generation amount of the charger product, and further improving user experience.

Technical proposal for solving the technical problems

The charger module according to the first aspect of the present invention includes an AC/DC conversion unit that converts an AC mains voltage into a DC bus voltage and supplies the DC bus voltage to the DC/DC conversion unit, a DC/DC conversion unit that converts the bus voltage into an output voltage to be supplied to a power receiving device, a first capacitor having one end to which the bus voltage is supplied, a feedback voltage regulator connected in parallel with the first capacitor, a micro control unit that changes the voltage of the reference voltage regulator by changing the voltage of the reference voltage regulator in response to the DC voltage of the power receiving device, and a bus voltage adjustment unit that samples the actual charging voltage of the power receiving device when it is detected that the power receiving device is connected to an output port of the charger module, and determines whether or not the maximum value of the actual charging voltage of the sampled power receiving device is larger than a predetermined voltage value, and that the maximum value of the actual charging voltage of the power receiving device is larger than the predetermined voltage is supplied to the power receiving device.

Further, the reference voltage adjusting unit is adjusted in advance so that the lowest voltage of the preset value of the bus voltage is the predetermined voltage value when not operated.

Further, the DC/DC conversion unit includes a plurality of DC/DC conversion units, the output ports of the plurality of DC/DC conversion units are connectable to a plurality of power receiving devices, respectively, the micro control unit samples actual charging voltages of the plurality of power receiving devices, respectively, and determines whether or not the maximum value of the sampled actual charging voltages of the plurality of power receiving devices, respectively, is larger than a predetermined voltage value, and when it is determined that the maximum value of the actual charging voltage of at least one power receiving device is larger than the predetermined voltage value, the micro control unit controls the reference voltage adjustment unit to operate so as to change a reference voltage on the positive electrode of the feedback voltage regulator, and the bus voltage adjustment unit controls so as to change the bus voltage according to the change of the reference voltage, so that the output voltage of the DC/DC conversion unit can reach the maximum value of the actual charging voltage of the at least one power receiving device.

Further, the reference voltage adjusting unit includes a first resistor, and at least one group formed by a switching tube and a resistor, the switching tube and the resistor of which the base are connected in series, one end of the first resistor is connected with the positive electrode of the feedback voltage regulator, the other end of the first resistor is grounded, the at least one group formed by a switching tube and a resistor, the base of which is connected with the micro control unit, are connected in series with the first resistor in parallel with each other, and in case that it is determined that the maximum value of the actual charging voltage of the power receiving device is greater than the predetermined voltage value, the micro control unit outputs a driving signal to the base of at least one switching tube of the group formed by a switching tube and a resistor, the base of which is connected with the micro control unit, so that the at least one switching tube is turned on to change the reference voltage on the positive electrode of the feedback voltage regulator.

Further, the predetermined voltage value is 5V.

Further, the micro control unit further detects whether the power receiving apparatus having the maximum value of the actual charging voltage greater than the predetermined voltage value has been disconnected from the charger module, and in the case where it is detected that the power receiving apparatus having the maximum value of the actual charging voltage greater than the predetermined voltage value has been disconnected from the charger module, the micro control unit controls the reference voltage adjusting unit to perform an operation to raise the reference voltage, and the bus voltage adjusting unit controls to lower the bus voltage in accordance with the raising of the reference voltage.

In the method for dynamically adjusting a bus voltage of a charger module according to the second aspect of the present invention, the charger module includes an AC/DC conversion unit that converts an AC mains voltage into a DC bus voltage and supplies it to the DC/DC conversion unit, a DC/DC conversion unit that converts the bus voltage into an output voltage supplied to a power receiving device, a first capacitor having one end supplied with the bus voltage and the other end connected to ground, a feedback voltage regulator connected in parallel with the first capacitor and having a positive electrode connected to ground, and a bus voltage adjustment unit, the method is characterized by comprising the steps of: the micro control unit samples the actual charging voltage of the powered device under the condition that the powered device is detected to be connected to the output port of the charger module; the micro control unit judges whether the maximum value of the sampled actual charging voltage of the powered device is larger than a preset voltage value; and when it is determined that the maximum value of the actual charging voltage of the power receiving apparatus is greater than the predetermined voltage value, the micro control unit controls the reference voltage adjusting unit to operate so as to change the reference voltage on the positive electrode of the feedback voltage regulator, and controls the bus voltage adjusting unit to change the bus voltage according to the change of the reference voltage so that the output voltage of the DC/DC converting unit can reach the maximum value of the actual charging voltage of the power receiving apparatus.

Further, the predetermined voltage value is 5V.

Further, the method also comprises the following steps: the micro control unit further detects whether the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module; in the case where it is detected that the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module, the micro control unit controls the reference voltage adjusting unit to perform an action to raise the reference voltage; and the bus voltage adjusting unit controls to decrease the bus voltage according to the increase of the reference voltage.

Effects of the invention

According to the charger module provided by the invention, when the power receiving equipment is detected to be connected to the output port of the charger module, the magnitude of the bus voltage can be dynamically adjusted according to the protocol requirement of the power receiving equipment, so that the bus voltage can be adjusted to be close to the output voltage of the DC/DC conversion unit, the conversion loss can be greatly reduced while the cost and the volume of a charger product are restrained, the DC/DC conversion efficiency is improved, the heating value of the charger product is reduced, and the user experience is further improved.

In addition, according to the charger module provided by the invention, when the fact that the power receiving equipment with the maximum value of the actual charging voltage being larger than the preset voltage value is disconnected with the charger module is detected, the bus voltage can be restored to a proper value, so that the charger module can adapt to random access or extraction of the power receiving equipment, proper voltage and power can be automatically provided, and further user experience can be further improved.

Drawings

The invention may be better understood by describing exemplary embodiments thereof in conjunction with the accompanying drawings, in which:

fig. 1 is a circuit schematic diagram showing a specific configuration of a charger module according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing one example of a bus voltage adjustment unit in the charger module according to the embodiment of the present invention.

Fig. 3 is a flowchart showing specific steps involved in a method for dynamically adjusting the bus voltage of a charger module according to an embodiment of the present invention.

Fig. 4 is a flowchart showing further steps included in a method for dynamically adjusting a bus voltage of a charger module according to an embodiment of the present invention.

Detailed Description

In the following, specific embodiments of the present invention will be described, and it should be noted that in the course of the detailed description of these embodiments, it is not possible in the present specification to describe all features of an actual embodiment in detail for the sake of brevity. It should be appreciated that in the actual implementation of any of the implementations, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Unless defined otherwise, technical or scientific terms used in the claims and specification should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. The terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are immediately preceding the word "comprising" or "comprising", are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, nor to direct or indirect connections.

< specific Structure of charger Module >

As shown in fig. 1, the charger module 10 according to the embodiment of the present invention includes an AC/DC conversion unit 101, a DC/DC conversion unit 102, a first capacitor EC1, a feedback regulator D1, a micro control unit 103, a reference voltage adjustment unit 104, and a bus voltage adjustment unit 105. In addition, in the example of fig. 1, the light emitting diode U2A, the resistor R1, the resistor R2, and the resistor R3 are further included.

The AC/DC conversion unit 101 converts an alternating commercial power voltage (for example, 220V) into a direct bus voltage (main line voltage) VBUS, and supplies it to the DC/DC conversion unit 102. The DC/DC conversion unit 102 converts the bus voltage VBUS into an output voltage supplied to the power receiving apparatus. As an example, although the power receiving apparatus is not shown in fig. 1, the power receiving apparatus may be connected to the output ports TYPC1, TYPC2, and TYPC3 in fig. 1, and may be, for example, an electronic apparatus such as a mobile phone, a tablet computer, a notebook computer, or the like, which is not particularly limited. In fig. 1, three output ports TYPC1, TYPC2, and TYPC3 are shown, but the number of output ports is not particularly limited in the present invention.

Further, one end of the first capacitor EC1 is supplied with the bus voltage VBUS, and the other end of the first capacitor EC1 is grounded (SGND). The feedback regulator D1 is connected in parallel with the first capacitor EC1, and the positive electrode of the feedback regulator is grounded (SGND).

Further, the Micro Control Unit (MCU) 103 samples the actual charging voltage of the power receiving device and determines whether the maximum value of the sampled actual charging voltage of the power receiving device is greater than a predetermined voltage value (e.g., 5V) if it is detected that the power receiving device is connected to the output port of the charger module.

When it is determined that the maximum value of the actual charging voltage of the power receiving apparatus is greater than the predetermined voltage value, the micro control unit 103 controls the reference voltage adjustment unit 104 to operate so as to change the reference voltage U1 on the positive electrode of the feedback voltage regulator D1, and the bus voltage adjustment unit 105 controls so as to change the bus voltage VBUS according to the change of the reference voltage U1, so that the output voltage of the DC/DC conversion unit 102 can reach the maximum value of the actual charging voltage of the power receiving apparatus.

As shown in fig. 2, as one example, the bus voltage adjustment unit 105 includes a triangular wave generator 501, a comparator 502, and a latch 503. In the bus voltage adjustment unit 105, the reference voltage U1 adjusted by the reference voltage adjustment unit 104 is input to one input terminal of the comparator 502. The comparator 502 compares the input reference voltage U1 with the triangular wave from the triangular wave generator 501 to obtain a first pulse signal and inputs it to the latch 503. The latch 503 changes the duty ratio of the PWM output signal according to the first pulse signal and the clock signal from the comparator 502 to adjust the magnitude of the bus voltage VBUS. In the present invention, the specific implementation of the bus voltage adjusting unit 105 is not particularly limited as long as the bus voltage VBUS can be changed according to the change of the reference voltage U1.

In fig. 1, the DC/DC conversion unit 102 includes 3 DC/DC conversion sections (DC/DC 1, DC/DC2, DC/DC 3), and output ports (TYPC 1, TYPC2, TYPC 3) of the 3 DC/DC conversion sections are connectable to a plurality of power receiving devices, respectively. Of course, in the present invention, the number of DC/DC converting sections and output ports is not limited to this.

In the example of fig. 1, the input port ADC7 of DC/DC1, DC/DC2, DC/DC3 is connected to the port ADC7 (port 8) of the micro control unit 103, the output port (TYPC 1) of DC/DC1 is connected to the port ADC6 (port 7) of the micro control unit 103, the output port (TYPC 2) of DC/DC2 is connected to the port ADC5 (port 6) of the micro control unit 103, and the output port (TYPC 3) of DC/DC3 is connected to the port ADC4 (port 5) of the micro control unit 103.

In fig. 1, the micro control unit 103 samples actual charging voltages (i.e., voltages of the output ports TYPC1, TYPC2, and TYPC 3) of each of the 3 power receiving apparatuses by an analog-digital conversion unit ADC (not shown), and determines whether the maximum value of the sampled actual charging voltages of each of the 3 power receiving apparatuses is greater than a predetermined voltage value (e.g., 5V), respectively.

In fig. 1, the reference voltage adjusting unit 104 includes a first resistor R4, a group formed by connecting the base in series with the resistor R5 and the switching transistor Q1 connected to the port IO2 of the micro control unit 103, and a group formed by connecting the base in series with the resistor R6 and the switching transistor Q2 connected to the port IO1 of the micro control unit 103. The group formed by the series connection of the switching transistor Q1 and the resistor R5, the base of which is connected to the port IO2 of the micro control unit 103, the group formed by the series connection of the switching transistor Q2 and the resistor R6, the base of which is connected to the port IO1 of the micro control unit 103, and the first resistor R4 are connected in parallel. One end of the first resistor R4 is connected to the positive electrode of the feedback regulator D1, and the other end of the first resistor R4 is grounded (SGND).

In the example of fig. 1, in the case where it is determined that, for example, the maximum value of the actual charging voltage of the power receiving device connected to the TYPC1 is greater than the predetermined voltage value (for example, in the case of 9V), the micro control unit 103 outputs a low level from the port IO2 to the base of the switching transistor Q1 in the reference voltage adjusting unit 104, and outputs a high level from the port IO1 to the base of the switching transistor Q2 in the reference voltage adjusting unit 104. At this time, the switching transistor Q1 (PNP type) is turned on and the switching transistor Q2 (PNP type) is turned off, so that the reference voltage U1 on the positive electrode of the feedback regulator D1 is lowered. The bus voltage adjusting unit 105 controls to raise the bus voltage VBUS to 9V or more in accordance with the decrease of the reference voltage U1, so that the output voltage of the DC/DC converting section DC/DC1 in the DC/DC converting unit 102 can reach the maximum value (i.e., 9V) of the actual charging voltage of the power receiving apparatus connected to TYPC 1.

Further, as another example, in a case where it is determined that, for example, the maximum value of the actual charging voltage of the power receiving apparatus connected to the TYPC2 is greater than a predetermined voltage value (for example, in a case of 12V), the micro control unit 103 outputs a low level from the port IO2 to the base of the switching transistor Q1 in the reference voltage adjusting unit 104, and outputs a low level from the port IO1 to the base of the switching transistor Q2 in the reference voltage adjusting unit 104. At this time, both the switching transistor Q1 (PNP type) and the switching transistor Q2 (PNP type) are turned on, so that the reference voltage U1 on the positive electrode of the feedback regulator D1 is further lowered. The bus voltage adjusting unit 105 performs control to raise the bus voltage VBUS to 12V or more in accordance with the further decrease of the reference voltage U1, so that the output voltage of the DC/DC converting section DC/DC1 in the DC/DC converting unit 102 can reach the maximum value (i.e., 12V) of the actual charging voltage of the power receiving apparatus connected to the TYPC 2.

Further, in the present invention, as another other example, in the case where it is determined that, for example, the maximum value of the actual charging voltage of the power receiving apparatus connected to the TYPC3 is greater than the predetermined voltage value (for example, in the case of 48V), the micro control unit 103 controls the reference voltage adjusting unit 104 to operate so as to decrease the reference voltage U1 on the positive electrode of the feedback regulator D1, and the bus voltage adjusting unit 105 further controls so as to adjust the bus voltage VBUS to the highest value (for example, 60V) in accordance with the decrease of the reference voltage U1. Then, the micro control unit 103 controls the reference voltage adjusting unit 104 to operate so as to raise the reference voltage U1 on the positive electrode of the feedback regulator D1, and the bus voltage adjusting unit 105 further controls so as to lower the bus voltage VBUS to a value (for example, 50V) slightly larger than and close to the maximum value of the actual charging voltage of the power receiving apparatus according to the rise of the reference voltage U1.

In the reference voltage adjusting unit 104 shown in fig. 1, the number of groups formed by connecting the switching transistors and the resistors, the bases of which are connected to the micro control unit 103, in series is 2, but the present invention is not limited thereto, and any number of groups may be provided according to the required adjustment accuracy, and the types of the switching transistors and the parameters of the respective resistors may be adjusted.

In addition, the reference voltage adjusting unit 104 is adjusted in advance so that the lowest voltage of the preset value of the bus voltage VBUS is a predetermined voltage value (e.g., 5V) when not operated. In the example of fig. 1, the magnitude of the first resistor R4 is adjusted in advance when not in operation, so that the lowest voltage of the preset value of the bus voltage VBUS is a predetermined voltage value. Here, the reason why the lowest voltage (predetermined voltage value) of the preset value of the bus voltage VBUS is preferably set to 5V is that the charging voltage of the protocol of the power receiving device such as most mobile phones is 5V (the charging voltage of the general fast charging protocol is greater than 5V, for example, 9 to 20V), whereas the DC/DC conversion unit 102 in the present invention has only the step-down function. In the present invention, the preset value of the bus voltage VBUS is not particularly limited as long as it is 5V or more.

Thus, according to the charger module 10 according to the embodiment of the present invention, when it is detected that the power receiving device is connected to the output port (TYPC 1, TYPC2, TYPC 3) of the charger module 10, the magnitude of the bus voltage VBUS can be dynamically adjusted according to the protocol requirement (the maximum value of the actual charging voltage) of the power receiving device, so that the bus voltage can be adjusted to be close to the output voltage of the DC/DC conversion unit, thereby greatly reducing the conversion loss while suppressing the cost and the volume of the charger product, improving the DC/DC conversion efficiency and reducing the heat generation amount of the charger product, and further improving the user experience.

In addition, in the embodiment of the present invention, the micro control unit 103 may further detect whether the power receiving device having the maximum value of the actual charging voltage greater than the predetermined voltage value has been disconnected from the charger module 10, and in the case where it is detected that the power receiving device having the maximum value of the actual charging voltage greater than the predetermined voltage value has been disconnected from the charger module 10, the micro control unit 103 controls the reference voltage adjusting unit 104 to operate so as to raise the reference voltage U1, and the bus voltage adjusting unit 105 controls so as to lower the bus voltage VBUS according to the rise of the reference voltage U1. For example, in the case where two kinds of charging devices whose actual charging voltages have maximum values of 20V and 5V are connected to the charger module, when the charging device of 20V is pulled out, the bus voltage VBUS may be adjusted to, for example, 10V. In the case where two kinds of charging devices whose actual charging voltages have maximum values of 20V and 12V are connected to the charger module, when the charging device of 20V is pulled out, the bus voltage VBUS can be adjusted to, for example, 15V.

Therefore, according to the charger module 10 according to the embodiment of the present invention, when it is detected that the power receiving device having the maximum value of the actual charging voltage greater than the predetermined voltage value is disconnected from the charger module 10, the bus voltage VBUS can be restored to a suitable value required by the currently connected power receiving device, so that the power receiving device can be adapted to random access or extraction of the power receiving device, and suitable voltage and power can be automatically provided, so that user experience can be further improved.

< method for dynamically adjusting bus voltage of charger Module >

Fig. 3 is a flowchart showing an example of specific steps included in a method for dynamically adjusting a bus voltage of a charger module according to an embodiment of the present invention.

As shown in fig. 3, first, in step ST1000, the micro control unit 103 detects that the power receiving apparatus has been connected to any one of the output ports of the charger module 10. Then, in step ST1001, the micro control unit 103 samples the actual charging voltage of the power receiving apparatus through the analog-digital conversion portion ADC. Then, in step ST1002, the micro control unit 103 determines whether the maximum value of the sampled actual charging voltage of the power receiving apparatus is greater than a predetermined voltage value. Then, in step ST1003, when it is determined that the maximum value of the actual charging voltage of the power receiving apparatus is greater than the predetermined voltage value (for example, 5V) (for example, 48V), the micro control unit 103 controls the reference voltage adjustment unit 104 to operate so as to decrease the reference voltage U1 on the positive electrode of the feedback regulator D1, and the bus voltage adjustment unit 105 further controls so as to adjust the bus voltage VBUS to the highest value (for example, 60V) in accordance with the decrease of the reference voltage U1. Then, in step ST1004, the micro control unit 103 controls the reference voltage adjusting unit 104 to operate so as to raise the reference voltage U1 on the positive electrode of the feedback regulator D1, and the bus voltage adjusting unit 105 further controls so as to lower the bus voltage VBUS to a value (for example, 50V) slightly larger than and close to the maximum value of the actual charging voltage of the power receiving apparatus according to the rise of the reference voltage U1.

Further, while the example in which the bus voltage VBUS is adjusted to the highest value and then is reduced to a value slightly larger than and close to the maximum value of the actual charging voltage of the power receiving apparatus is shown in the flowchart of fig. 3, the present invention is not limited thereto, and the bus voltage VBUS may be gradually increased from a preset value to a value slightly larger than and close to the maximum value of the actual charging voltage of the power receiving apparatus.

Thus, according to the method for dynamically adjusting the bus voltage of the charger module according to the embodiment of the present invention, when it is detected that the power receiving device is connected to the output port (TYPC 1, TYPC2, TYPC 3) of the charger module 10, the magnitude of the bus voltage VBUS can be dynamically adjusted according to the protocol requirement (the maximum value of the actual charging voltage) of the power receiving device, so that the bus voltage can be adjusted to be close to the output voltage of the DC/DC conversion unit, thereby greatly reducing the conversion loss to promote the DC/DC conversion efficiency and reduce the heat generation amount of the charger product while suppressing the cost and volume of the charger product, and further improving the user experience.

As shown in fig. 4, after step ST1004 in fig. 3, the micro control unit 103 may further detect whether the power receiving apparatus whose maximum value of the actual charging voltage is greater than a predetermined voltage value has been disconnected from the charger module 10 (step ST 1005). Then, in step ST1006, in the case where it is detected that the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module 10, the micro control unit 103 controls the reference voltage adjusting unit 104 to operate so as to raise the reference voltage U1. Finally, in step ST1007, the bus voltage adjustment unit 105 performs control so that the bus voltage VBUS decreases according to the increase of the reference voltage U1. For example, in the case where two kinds of charging devices whose actual charging voltages have maximum values of 20V and 5V are connected to the charger module, when the charging device of 20V is pulled out, the bus voltage VBUS may be adjusted to, for example, 10V. In the case where two kinds of charging devices whose actual charging voltages have maximum values of 20V and 12V are connected to the charger module, when the charging device of 20V is pulled out, the bus voltage VBUS can be adjusted to, for example, 15V.

Therefore, according to the method for dynamically adjusting the bus voltage of the charger module according to the embodiment of the present invention, when it is detected that the power receiving device having the maximum value of the actual charging voltage greater than the predetermined voltage value is disconnected from the charger module 10, the bus voltage VBUS can be restored to a suitable value required by the currently connected power receiving device, so that the method can adapt to random connection or disconnection of the power receiving device, automatically provide suitable voltage and power, and further improve user experience.

It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and/or aspects thereof) may be used in combination with one another. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the various embodiments of the invention without departing from the scope thereof. While the dimensions and types of materials described herein are intended to define the parameters of the various embodiments of the invention, the various embodiments are not meant to be limiting and are exemplary embodiments. Many other embodiments will be apparent to those of skill in the art upon reading the above description. The scope of the various embodiments of the invention should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

Industrial applicability

The invention can be applied to chargers for electronic equipment such as mobile phones, tablet computers, notebook computers and the like.

Claims

1. A charger module comprises an AC/DC conversion unit, a DC/DC conversion unit, a first capacitor, a feedback voltage stabilizer, a micro control unit, a reference voltage adjusting unit and a bus voltage adjusting unit,

the AC/DC conversion unit converts an AC mains voltage into a DC bus voltage and supplies it to the DC/DC conversion unit,

the DC/DC conversion unit converts the bus voltage into an output voltage supplied to a power receiving apparatus,

one end of the first capacitor is provided with the bus voltage, the other end of the first capacitor is grounded,

the feedback voltage stabilizer is connected with the first capacitor in parallel, the positive electrode of the feedback voltage stabilizer is grounded,

the micro control unit samples an actual charging voltage of the powered device and judges whether a maximum value of the sampled actual charging voltage of the powered device is greater than a predetermined voltage value in a case that the powered device is detected to be connected to an output port of the charger module,

when it is determined that the maximum value of the actual charging voltage of the power receiving apparatus is greater than the predetermined voltage value, the micro control unit controls the reference voltage adjusting unit to operate so as to change the reference voltage on the positive electrode of the feedback voltage regulator, and controls the bus voltage adjusting unit to change the bus voltage according to the change of the reference voltage so that the output voltage of the DC/DC converting unit can reach the maximum value of the actual charging voltage of the power receiving apparatus.

2. The charger module of claim 1 wherein the battery charger module comprises,

the reference voltage adjusting unit is adjusted in advance so that the lowest voltage of the preset value of the bus voltage is the predetermined voltage value when not operated.

3. A charger module as claimed in claim 1 or 2, characterized in that,

the DC/DC conversion unit includes a plurality of DC/DC conversion sections whose output ports are connectable to a plurality of power receiving devices respectively,

the micro control unit samples actual charging voltages of the plurality of powered devices respectively, and judges whether the maximum value of the sampled actual charging voltages of the plurality of powered devices is larger than a preset voltage value respectively,

when it is determined that the maximum value of the actual charging voltage of at least one power receiving apparatus is greater than the predetermined voltage value, the micro control unit controls the reference voltage adjustment unit to operate so as to change the reference voltage on the positive electrode of the feedback voltage regulator, and controls the bus voltage adjustment unit to change the bus voltage according to the change of the reference voltage so that the output voltage of the DC/DC conversion unit can reach the maximum value of the actual charging voltage of the at least one power receiving apparatus.

4. A charger module as claimed in claim 1 or 2, characterized in that,

the reference voltage adjusting unit comprises a first resistor and at least one group formed by connecting a switching tube with a base electrode connected with the micro control unit and the resistor in series,

one end of the first resistor is connected with the positive electrode of the feedback voltage stabilizer, the other end of the first resistor is grounded,

the at least one group of switching tubes and resistors with their bases connected to the micro control unit are connected in series with the first resistor in parallel with each other,

when it is determined that the maximum value of the actual charging voltage of the power receiving apparatus is greater than the predetermined voltage value, the micro control unit outputs a driving signal to the base of at least one switching tube of the group formed by the switching tube and the resistor, the base of which is connected in series with the micro control unit, so that the at least one switching tube is turned on to change the reference voltage on the positive electrode of the feedback voltage regulator.

5. A charger module as claimed in claim 1 or 2, characterized in that,

the predetermined voltage value is 5V.

6. A charger module as claimed in claim 1 or 2, characterized in that,

the micro control unit further detects whether the powered device having the maximum value of the actual charging voltage greater than the predetermined voltage value has been disconnected from the charger module,

in the case where it is detected that the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module, the micro control unit controls the reference voltage adjusting unit to perform an action to raise the reference voltage,

the bus voltage adjusting unit controls to decrease the bus voltage according to the increase of the reference voltage.

7. A method for dynamically adjusting the bus voltage of a charger module,

the charger module comprises an AC/DC conversion unit, a DC/DC conversion unit, a first capacitor, a feedback voltage stabilizer, a micro control unit, a reference voltage adjusting unit and a bus voltage adjusting unit,

the method is characterized by comprising the following steps:

the micro control unit samples the actual charging voltage of the powered device under the condition that the powered device is detected to be connected to the output port of the charger module;

the micro control unit judges whether the maximum value of the sampled actual charging voltage of the powered device is larger than a preset voltage value; and

8. The method for dynamically adjusting the bus voltage of a charger module as recited in claim 7,

9. A method for dynamically adjusting a bus voltage of a charger module as set forth in claim 7 or 8,

the predetermined voltage value is 5V.

10. The method for dynamically adjusting the bus voltage of a charger module of claim 7 or 8, further comprising the steps of:

the micro control unit further detects whether the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module;

in the case where it is detected that the power receiving apparatus whose maximum value of the actual charging voltage is greater than the predetermined voltage value has been disconnected from the charger module, the micro control unit controls the reference voltage adjusting unit to perform an action to raise the reference voltage; and