CN113922431A

CN113922431A - Power supply device and charging control method

Info

Publication number: CN113922431A
Application number: CN202010664256.8A
Authority: CN
Inventors: 江森龙
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2022-01-11
Anticipated expiration: 2040-07-10
Also published as: CN113922431B; WO2022007668A1

Abstract

The present disclosure provides a power supply device and a charging control method. The power supply device comprises a plurality of charging units, a plurality of commutation switches and a control unit; the charging units are connected between the electric energy input end and the electric energy output end, and each charging unit, the electric energy input end and the electric energy output end form an independent charging branch; each of the plurality of the switch switches is connected in series to one of the charging branches or is electrically connected between two of the charging units; the control unit controls the on-off of the path changing switch, so that the charging units are connected in series or in parallel. The scheme of the disclosure realizes miniaturization of the power supply device and increases the power output range.

Description

Power supply device and charging control method

Technical Field

The present disclosure relates to the field of charging technologies, and in particular, to a power supply device and a charging control method.

Background

With the wide application of electronic devices (such as smart phones, tablet computers and other intelligent terminal devices), the functions of the electronic devices are more and more, but the power consumption is correspondingly increased continuously, and frequent charging is required. In order to increase the charging speed, the corresponding power adapter is required to be able to output more power.

However, the power adapters capable of outputting a large power have a large volume, are inconvenient to carry about, and have poor user experience.

The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide a power supply device having a small size.

It is another object of the present disclosure to provide a chair having.

In order to solve the technical problem, the following technical scheme is adopted in the disclosure:

according to one aspect of the present disclosure, there is provided a power supply apparatus having a power input terminal to which an external power supply is connected and a power output terminal to which a device to be charged is connected; the power supply device includes:

the charging units are connected between the electric energy input end and the electric energy output end, and each charging unit, the electric energy input end and the electric energy output end form an independent charging branch;

each of the plurality of the transfer switches is connected in series on one of the charging branches or is electrically connected between two charging units;

and the control unit controls the on-off of the path changing switch, so that the plurality of charging units are connected in series or in parallel to increase the output power of the power supply device.

According to an embodiment of the present disclosure, each charging branch is connected to at least one of the switch in series;

at least one of the circuit-changing switches is connected in series between the output end of each charging unit and the input end of another charging unit.

According to an embodiment of the present disclosure, one of the charging units is a main charging unit; the rest of the charging units are slave charging units;

if the power required to be output by the power supply providing device is less than or equal to the maximum output power of the main charging unit, the control unit controls the on-off of the commutation switch to turn off the charging branch where the slave charging unit is located, so that the main charging unit outputs power independently.

According to an embodiment of the present disclosure, if the power required to be output by the power supply device is greater than the maximum output power of the main charging unit, the control unit controls the on/off of the commutation switch to connect some or all of the slave charging units in parallel or in series with the main charging unit to output power together.

According to an embodiment of the present disclosure, the control unit is further configured to communicate with the device to be charged to determine a target power required to be output; and regulating and controlling the output power of the main charging unit and the slave charging unit which output power together according to the target power.

According to an embodiment of the present disclosure, for a charging loop formed by the charging branch and a charging path in the device to be charged, the control unit is further configured to control the plurality of charging units to be connected in parallel or in series according to a maximum current allowed to pass through the charging loop.

According to an embodiment of the present disclosure, the control unit is a protocol chip in the main charging unit.

According to an embodiment of the present disclosure, the plurality of charging units includes a first charging unit and a second charging unit; the circuit changing switch comprises a first circuit changing switch, a second circuit changing switch and a third circuit changing switch;

the first end of the first transfer switch is connected with the input end of the first charging unit, and the second end of the first transfer switch is grounded;

a first end of the second transfer switch is connected with an output end of the first charging unit, and a second end of the second transfer switch is connected with an output end of the second transfer switch;

the first end of the third transfer switch is connected with the input end of the first charging unit, and the second end of the third transfer switch is connected with the output end of the second charging unit;

the controlled ends of the first path changing switch, the second path changing switch and the third path changing switch are all electrically connected with the control unit.

According to an embodiment of the present disclosure, the charging unit is disposed in a modularized manner, and the charging unit has a power interface for connecting the electric energy input end and the electric energy output end, and a combined interface for connecting other charging units in parallel or in series.

According to an embodiment of the present disclosure, the charging unit includes:

the capacity of the at least one filter capacitor is smaller than a preset threshold value, and the at least one filter capacitor is used for filtering rectified alternating current to obtain pulsating direct current;

and the voltage transformation module is used for transforming the pulsating direct current to obtain voltage and current for charging the equipment to be charged.

According to an embodiment of the present disclosure, the voltage transformation module includes: a switch module and a transformer; the charging unit further comprises a first detection module and a power supply control module, and the first detection module and the power supply control module are used for detecting the voltage and/or the current of the pulsating direct current;

and the power supply control module is used for controlling the conduction time of the switch module according to the voltage and/or current detection result of the pulsating direct current so as to control the output power of the transformer.

According to an embodiment of the present disclosure, the charging unit further includes:

the operational amplifier module is used for converting the voltage value of the pulsating direct current into a current value, one end of the operational amplifier module is connected with the output end of the at least one capacitor, and the other end of the operational amplifier module is connected with the first detection module;

the power control module is further configured to: and controlling the conduction time of the switch module according to the converted current value so as to control the output power of the transformer.

the clamping module is used for absorbing leakage inductance energy of the transformer and releasing the absorbed energy to the output end of the transformer under the condition that the switch module is switched off.

According to another aspect of the present disclosure, there is provided a charging control method for use in a power supply apparatus, the method including:

acquiring expected charging power requested or allowed by a device to be charged;

and controlling one charging unit to work alone or a plurality of charging units to work in parallel or in series according to the expected charging power.

According to an embodiment of the present disclosure, the plurality of charging units of the power supply device are divided into a master charging unit and a plurality of slave charging units;

the controlling one of the charging units to work alone or a plurality of the charging units to work in parallel or in series according to the expected charging power comprises the following steps:

if the charging power requested or allowed by the equipment to be charged is less than or equal to the output power of the main charging unit, controlling a branch where the slave charging unit is located to be switched off, and controlling the main charging unit to output power independently;

and if the charging power requested or allowed by the equipment to be charged is greater than the output power of the main charging unit, controlling the one or more slave charging units to be connected with the main charging unit in parallel or in series so as to output power together.

According to an embodiment of the present disclosure, if the charging power requested or allowed by the device to be charged is greater than the output power of the main charging unit, the controlling the one or more slave charging units to be connected in parallel or in series with the main charging unit to output power together includes:

if the charging power requested or allowed by the equipment to be charged is greater than the output power of the main charging unit, acquiring the maximum current allowed by a charging loop formed by the charging branch and a charging path in the equipment to be charged;

the one or more slave charging units and the master charging unit cooperate in parallel or in series depending on the maximum current allowed to pass through the charging circuit.

controlling the equal power of the main charging unit and each slave charging unit which output power together according to the required charging power requested or allowed by the equipment to be charged; or the main charging unit and each slave charging unit which control the common output power according to the preset proportion.

The power supply device comprises a plurality of charging units and a plurality of switching switches capable of adjusting the plurality of charging units to form a series connection mode or a parallel connection mode, and one charging unit can work independently or the plurality of charging units output power jointly in the series connection mode or the parallel connection mode by controlling the on-off of the switching switches, so that the power supply device can output power in a larger range, and the charging adaptability of more devices to be charged is improved.

And, for only there is the existing power supply device of a charging circuit all the way, this disclosure through set up a plurality of charging unit with the cooperation when exporting the power of the same size, the power that needs the output in every charging unit can be reduced to make the inside buffer capacitor of charging unit need not to bear great withstand voltage value, and storage capacity, and can choose the electric capacity of less appearance value for use, thereby reduced the space that electric capacity occupies in the charging unit, realize power supply device's miniaturization.

In summary, the present disclosure achieves miniaturization of the power supply device and increases the power output range.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram illustrating a power supply apparatus connected to a device to be charged according to an embodiment;

FIG. 2 is a schematic diagram illustrating a circuit portion connection of a power supply apparatus according to one embodiment;

FIG. 3 is a circuit connection schematic of a charging unit according to one embodiment;

FIG. 4 is a circuit connection schematic of a charging unit according to yet another embodiment;

FIG. 5 is a schematic block diagram of a charging system provided in one embodiment of the present application;

fig. 6 is a schematic structural view of a charging system provided in another embodiment of the present application;

FIG. 7 is a schematic diagram showing a power supply circuit portion connection according to another embodiment;

FIG. 8 is a schematic diagram showing a power supply circuit portion connection according to yet another embodiment;

FIG. 9 is a first mode of operation of the circuit of FIG. 8;

FIG. 10 is a second mode of operation of the circuit of FIG. 8;

FIG. 11 is a third mode of operation of the circuit of FIG. 8;

FIG. 12 is a flow diagram illustrating a charge control method according to one embodiment;

fig. 13 is a flowchart illustrating a charging control method according to another embodiment.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

Preferred embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings of the present specification.

Fig. 1 is a schematic diagram illustrating a charging system in accordance with an exemplary embodiment.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a power supply apparatus 1 and a device to be charged 2 according to an embodiment.

The Power supply device 1 is, for example, a Power adapter, a portable Power supply (Power Bank), or the like. The power supply device 1 is connected with the device to be charged 2 through a cable to supply electric energy to the device to be charged 2 so as to charge a battery in the device to be charged 2.

The types of the power supply apparatus 1 can be classified into, for example, a general charging type and a quick charging type. The power supply apparatus 1 of the quick charging type can supply a larger output power to the device to be charged 2 than the power supply apparatus 1 of the general charging type. The maximum output power of the power supply device 1 of the ordinary charging type is, for example, 10W (5V/2A). The fast charge type may be further classified into a first fast charge type and a second fast charge type. Wherein the maximum output power of the power supply apparatus 1 of the first fast charging type is, for example, 20W (5V/4A); the maximum output power of the power supply apparatus 1 of the second quick charge type is, for example, 50W (10V/5A).

The device to be charged 2 may be, for example, a terminal or an electronic device, and the terminal or the electronic device may be a mobile terminal such as a mobile phone, a game console, a tablet computer, an electronic book reader, an intelligent wearable device, an MP4(moving picture experts Group Audio Layer IV, motion picture experts compression standard Audio Layer) player, an intelligent home device, an AR (Augmented Reality) device, and a VR (Virtual Reality) device; or rechargeable electronic equipment with a charging function, such as a mobile power supply (such as a charger and a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless earphone, a Bluetooth sound box and the like; alternatively, it may be a Personal Computer (PC), such as a laptop portable Computer and a desktop Computer.

Referring to fig. 2, fig. 2 is a circuit portion connection diagram of the power supply apparatus 1 according to an embodiment. In one embodiment, the power supply apparatus 1 has a power input terminal 11 for connecting an external power source and a power output terminal 12 for connecting the device to be charged 2; the power supply device 1 includes a plurality of charging units 13, a plurality of commutation switches 14, and a control unit 15. The plurality of charging units 13 are connected between the electric energy input end 11 and the electric energy output end 12, and each charging unit 13, the electric energy input end 11 and the electric energy output end 12 form an independent charging branch; among the plurality of transfer switches 14, a part of the transfer switches 14 are connected in series on the charging branch, and the other part of the transfer switches 14 are connected between the two charging units 13; the control unit 15 controls on/off of the changeover switch 14 so that the plurality of charging units 13 are connected in series or in parallel to increase the output power of the power supply apparatus 1.

The charging unit 13 is configured to convert an ac power into a dc power for charging a battery in the device 2 to be charged. The power output 12 may be a USB interface, and may specifically be a TYPE-C interface. The charging interface may be, for example, a USB interface that meets USB 2.0 specification, USB3.0 specification, or USB3.1 specification, and includes: micro USB interface or USB TYPE-C interface, etc. In some embodiments, the charging interface may also be a lightning interface, or any other type of parallel or serial interface capable of being used for charging.

Accordingly, the charging interface of the device 2 to be charged may be a male connector of a USB interface or a Lightning interface that meets the USB 2.0 specification, the USB3.0 specification, or the USB3.1 specification and is adapted to the charging interface.

If the power supply device 1 can communicate with the device to be charged 2 through the charging interface and the charging interface, both parties do not need to set an additional communication interface or other wireless communication modules. If the charging interface and the charging interface are USB interfaces, the power supply apparatus 1 and the device to be charged 2 may communicate based on a data line (e.g., D + and/or D-line) in the USB interface. If the charging interface and the charging interface are USB interfaces (such as USB TYPE-C interfaces) supporting a power transfer (PD) communication protocol, the power supply apparatus 1 and the device to be charged 2 may communicate based on the PD communication protocol. Further, the power supply apparatus 1 and the device to be charged 2 may communicate by other communication means than the charging interface and the charging interface. For example, the power supply apparatus 1 and the device to be charged 2 communicate in a wireless manner, such as Near Field Communication (NFC).

Taking the Charging interface and the Charging interface as USB interfaces, when the device to be charged 2 is connected to the power supply apparatus 1 through a cable, the device to be charged 2 identifies whether the connection Port provided by the power supply apparatus 1 is a Dedicated Charging Port (DCP), the Port does not support data transmission, can provide a Charging current of more than 1.5A, and is short-circuited between the D + and D-lines of the Port. This type of port can support chargers of higher charging capabilities and on-board chargers. Specifically, the device to be charged 2 recognizes whether the connection port provided by the power supply apparatus 1 is a DCP through the BC2.1 protocol. BC2.1 is the USB charging specification, which specifies the detection, control and reporting mechanisms for charging of devices through USB ports. The BC2.1 protocol is well known to those of ordinary skill in the art and will not be described in detail herein to avoid obscuring the present disclosure.

When recognizing that the port provided by the power supply apparatus 1 is DCP, the device to be charged 2 can further recognize the type of the power supply apparatus 1 by setting different preset communication levels to be loaded on D +/D-, respectively.

Referring to fig. 3, fig. 3 is a circuit connection diagram of a charging unit according to an embodiment.

The charging unit 13 in the present application is explained in the following embodiments. The charging unit 13 comprises at least one filter capacitor and a voltage transformation module, wherein the capacity of the at least one filter capacitor is smaller than a preset threshold value, and the at least one filter capacitor is used for filtering rectified alternating current to obtain pulsating direct current; the voltage transformation module is used for transforming the pulsating direct current to obtain voltage and current for charging the equipment to be charged.

The capacitance of the filter capacitor in the embodiment of the present application may be smaller than a preset threshold, for example, may be smaller than 100F. In the case where the capacity of the filter capacitor is smaller than the preset threshold, the volume of the filter capacitor is relatively small, so that the volume of the charging unit 13 can be reduced as much as possible.

Specifically, the filter capacitor uses an MLLCC capacitor (patch capacitor) or a film capacitor with a smaller volume, so that the volume of the adapter can be reduced; the number of the MLLCC capacitors or the film capacitors can be one or more, and the connection relationship can be series connection or parallel connection, which is mainly determined according to the capacity of the required capacitor.

In the charging unit 13 provided in the embodiment of the present application, the capacity of the filter capacitor in the charging unit 13 is smaller than a certain threshold, and the size of the filter capacitor can be reduced, so that the size of the charging unit 13 can be reduced, and the size of the power supply device can be miniaturized.

Alternatively, in some embodiments, as shown in fig. 3, the transforming module 220 may include a switching module 221 and a transformer 222. The charging unit 13 may further include a first detection module 231 and a power control module 240. The first detecting module 231 is configured to detect a voltage and/or a current of the pulsating dc current. And a power control module 240, configured to control the on-time of the switch module according to the voltage and/or current detection result of the pulsating dc current, so as to control the output power of the transformer.

The switch module in the embodiment of the present application may be the switch power supply 113, and the first detection module may be a voltage division detection circuit. In this embodiment, the first detecting module 231 may detect a voltage of the dc current filtered by the filter capacitor 210, so that the power control module 240 may control the on-time of the switch module 221 according to the voltage of the dc current detected by the first detecting module 231.

Similarly, the first detection module 231 may detect the current of the dc current filtered by the filter capacitor 210, so that the power control module 240 may control the on-time of the switch module 221 according to the current magnitude of the dc current detected by the first detection module 231.

It is explained above that the control module can control the on-time of the switch module according to the voltage and/or the current magnitude of the pulsating direct current detected by the first detection module, and the control module controls the on-time of the switch module according to the detected voltage magnitude of the pulsating direct current will be described in detail below.

Optionally, in some embodiments, the control module is further configured to: when the voltage of the pulsating direct current is smaller than a first preset voltage threshold, reducing the conduction time of the switch module; and/or reducing the conduction time of the switch module when the current of the pulsating direct current is smaller than a first preset current threshold value.

In the embodiments of the present application, a voltage is taken as an example for explanation. The application can control the on-time of the switch module 221 by detecting the voltage of the pulsating direct current filtered by the filter capacitor 210 through the first detection module 231, and if the voltage of the pulsating direct current detected by the first detection module 231 is smaller than a first preset voltage threshold, for example, smaller than 100V, the power control module 240 can control to reduce the on-time of the switch module 221, so as to reduce the output power when the voltage input to the charging unit 13 is lower, and further, the overall output efficiency of the charging unit 13 can be improved.

It should be understood that the on-time of the switch module 221 and the current flowing through the switch module 221 may have a relationship, that is, the longer the on-time of the switch module 221 is, the larger the current flowing through the switch module 221 is; the shorter the on-time of the switch module 221, the smaller the current flowing through the switch module 221.

Similarly, the on-time of the switch module 221 may also be controlled by detecting the magnitude of the pulsating dc current filtered by the filter capacitor 210 through the first detection module 231, and for brevity, the detailed description is omitted here.

FIG. 4 is a circuit connection schematic of a charging unit according to yet another embodiment; optionally, in some embodiments, as shown in fig. 4, the charging unit 13 may further include an operational amplifier module 250. The operational amplifier module 250 is configured to convert a voltage value of the pulsating direct current into a current value, one end of the operational amplifier module is connected to the output end of the at least one capacitor, and the other end of the operational amplifier module is connected to the first detection module; the control module is further to: and controlling the conduction time of the switch module according to the converted current value so as to control the output power of the transformer.

Optionally, in some embodiments, the control module is configured to reduce the on-time of the switch module when the converted current value is smaller than a second preset current threshold.

In this embodiment of the application, the operational amplifier module 250 may convert the voltage of the pulsating direct current output by the filter capacitor 210 into a current, the first detection module 231 detects the converted current, and the power control module 240 may adjust the on-time of the switch module 221 according to the converted current detected by the first detection module 231. If the converted current is smaller than the second preset current threshold, the on-time of the switch module 221 may be controlled to be reduced. For example, assuming that the preset current threshold is 50A, if the first detection module 231 detects that the current converted by the operational amplifier module 250 is 40A and is smaller than the second preset current threshold, the power control module 240 may control to reduce the current flowing through the switch module 221, for example, may control to reduce the on-time of the switch module 221, so as to reduce the output power when the voltage input to the charging unit 13 is low, and further, may improve the overall output efficiency of the charging unit 13.

Optionally, in some embodiments, as shown in fig. 4, the charging unit 13 further includes a second detection module 232. A second detection module 232, configured to detect a current and/or a voltage output by the secondary side of the transformer 222; the power control module 240 is further configured to: and controlling the conduction time of the switch module according to the current and/or voltage detection result output by the secondary side of the transformer and the voltage and/or current detection result of the pulsating direct current so as to control the output power of the transformer.

In the embodiments of the present application, a voltage is taken as an example for explanation. The application can also control the on-time of the switch module 221 by detecting the voltage magnitude output by the secondary side of the transformer 222 and combining the voltage magnitude of the pulsating direct current, if the voltage magnitude output by the secondary side of the transformer 222 detected by the second detection module 232 is smaller than a preset threshold, for example, smaller than 10V, and the voltage magnitude of the pulsating direct current is smaller than the preset threshold, for example, smaller than 30V, the power control module 240 can control to reduce the on-time of the switch module, so as to reduce the output power when the voltage input to the charging unit 13 is lower, and further, the overall output efficiency of the charging unit 13 can be improved.

The method for controlling the on-time of the switch module according to the magnitude of the current is similar to the method described above, and for brevity, the detailed description is omitted here. As shown in fig. 5, a schematic block diagram of a charging system 500 is provided for implementing the present application. The charging system 500 may include an adapter 500a and an electronic device 500b, wherein the adapter 500a may be the charging unit 13 described above, and the electronic device may be the device to be charged 2 described above.

The charging unit 13 in the embodiment of the present application may include a rectifying module 510, a filtering module 520, a transforming module 530, an operational amplifier module 540, a first control module 550, a second control module 560, and a switching module 570. The filtering module 520 in the embodiment of the present application may include a filter C1, wherein the filter C1 may be the filtering capacitor 210, the switching module 570 may be the switching module 221, the transforming module 530 may be the transformer 222, and the first control module 550 and the second control module 560 may be the power control module 240.

In the embodiment of the present application, when the switch module 570 is turned off, if the power supply device charges the battery through the input interface of the charging unit 13, since the switch module 570 is in the off state, the alternating current input through the input interface passes through the rectifying module 510 and the filtering module 520, and then the direct current is output and directly passes through the converting module 530 to charge the battery, however, the direct current will cause the charging unit 13 to be damaged. Therefore, the charging unit 13 can be further improved, as will be described in detail below.

Optionally, in some embodiments, as shown in fig. 6, the charging unit 13 further includes: a clamping module 580 for absorbing the leakage inductance energy of the transformer and releasing the absorbed energy to the output terminal of the transformer in case the switching module is turned off.

As shown in fig. 6, the control module in the embodiment of the present application may be the first control module 550 in fig. 6. The clamping module in the embodiment of the present application may have one end connected to the output end of the at least one filter capacitor, and the other end connected to the first control module 550.

The clamping module 580 in the embodiment of the present application may include a capacitor C2, and may absorb all or part of the leakage inductance energy of the transformer when the switching module 570 is turned off. The energy processed by the clamping module 580 may be input to the output of the transformer for charging the battery.

Due to the clamping module 580, the hard force of the switching tube included in the switching module 570 can be reduced, a switching tube with lower conduction rate can be used, the cost is reduced, and the conversion efficiency of the charging unit 13 is improved.

It should be appreciated that the clamping module 580 and the switching module 570 in the embodiments of the present application operate in complementary modes, i.e., when the switching module 570 is in a closed state, the clamping module 580 may be opened; the clamping module 580 may be closed when the switching module 570 is in the open state.

Specifically, when the switch module 570 is in a closed state, the clamp module 580 may be turned off, in which case, the dc current output after passing through the filter may be chopped by the switch module 570, and the dc current processed by the transform module 530 may be used to charge the battery; when the switching module 570 is in the open state, the clamping module 580 may be closed, in which case some or all of the leakage inductance energy of the transformer may be absorbed by the clamping module 580, and the clamping module 580 may then release the absorbed energy to the output of the conversion module 530 for charging the battery.

Referring to fig. 3, fig. 3 is a circuit connection diagram of the charging unit 13 according to an embodiment. In an embodiment of the charging unit 13, the charging unit 13 may include a primary rectifying circuit 1311, a transformer chopper circuit 1312, and a secondary rectifying circuit 1314, which are electrically connected in this order. The rectifier circuit may be a rectifier bridge circuit, and the transformer chopper circuit 1312 may specifically include a power transformer, an AC-DC power management chip 1313.

The first end of the primary winding of the power transformer is connected with the output end of the rectifying circuit, and the second end of the primary winding is connected with the switch control end SW of the AC-DC power management chip 1313; the input end of the feedback circuit is connected with the primary winding or the secondary winding of the power transformer, and the output end of the feedback circuit is connected with the feedback end FB of the AC-DC power management chip 1313.

The secondary rectification circuit 1314 is connected to the secondary side of the transformer and is used for further rectifying the steamed bread waves output by the secondary side of the transformer to output a stable direct-current power supply.

The protocol chip 1315 is further disposed on the secondary side of the transformer, and the protocol chip 1315 is configured to perform handshaking with the device to be charged 2 to obtain the charging power requested by the device to be charged 2, so as to further perform communication with the AC-DC power management chip 1313, so that the AC-DC power management chip 1313 adjusts the switching frequency of the switch control terminal, and thus adjusts the output voltage on the secondary side of the power transformer.

It should be understood that, when the device to be charged 2 is charged by the power supply apparatus 1, the required or allowed charging voltage and/or charging current can be requested from the power supply apparatus 1 to meet the charging requirement thereof through the communication channel (e.g. through the data line D +/D-) in the USB interface) with the power supply apparatus 1.

The control unit 15 may be provided as the protocol chip 1315 within the main charging unit 131, so that a separate and additional control-class chip is not required. The protocol chip 1315 of the master charging unit 131 is capable of communicating with the device to be charged 2 not only to determine the power to be output by the power supply apparatus 1, but also to manage and coordinate the operation of the power of the slave charging unit 132 by controlling the transfer switch 14; the protocol chip 1315 may further communicate with the AC-DC power management chip 1313 in the slave power unit to control the power output in the slave power unit so that the power output by the master charging unit 131 and the slave charging unit 132 together matches the charging power requested or allowed by the device to be charged 2.

It should be understood that the circuit architecture of the charging unit 13 is not limited thereto, and a charge pump circuit may also be employed. Any circuit capable of ac-dc power conversion is within the scope of the present disclosure.

Referring to fig. 7, fig. 7 is a circuit portion connection diagram of a power supply apparatus 1 according to another embodiment. In one embodiment, a charging unit is set as the main charging unit 131; the remaining charging units 13 are slave charging units 132. The slave charging unit 132 is controlled by the master charging unit 131. The branch where the main charging unit 131 is located is referred to as a main charging branch, and the branch where the slave charging unit 132 is located is referred to as a slave charging branch.

Regarding the circuit configuration, the circuit architecture between all the master charging unit 131 and the slave charging unit 132, and the slave charging unit 132 may be the same or different. For example, the main charging circuit employs an electric energy conversion circuit having the transformer chopper circuit 1312 as a core, and the slave charging unit 132 employs a charge pump circuit. And, some slave charging circuits employ an electric energy conversion circuit with the transformer chopper circuit 1312 as a core, and other slave charging circuits employ a charge pump circuit.

When the circuit configurations of the two charging units 13 are the same, the specific circuit parameters may be the same or different. For example, the output power of the master charging unit 131 may be 40W, and the output power of the slave charging unit 132 may be 20W.

In one embodiment, all the master charging unit 131 and the slave charging unit 132 may adopt the same circuit architecture and the same circuit parameters. Further, in this embodiment, in order to reduce the volume of the power supply apparatus 1 and reduce the material cost, a protocol chip 1315 may be provided only in the main charging unit 131 for communicating with the device to be charged 2; the slave charging unit 132 is not provided with the protocol chip 1315.

As described above, in order to coordinate operations among the plurality of charging units 13, the power supply apparatus 1 further includes a plurality of transfer switches 14 and a control unit 15, wherein a part of the transfer switches 14 are connected in series to the charging branch, and another part of the transfer switches 14 are connected between two charging units 13. The control unit 15 controls on/off of the changeover switch 14 so that the plurality of charging units 13 are connected in series or in parallel to increase the output power of the power supply apparatus 1.

For a charging unit 13, the transfer switch 14 connected in series to the charging branch of the charging unit 13 can control whether the charging branch can be conducted; the transfer switch 14 connected between the two charging units 13 can control whether the two charging units 13 can be connected in series or not.

When all the switch switches 14 connected in series to the charging branches are turned on and the switch switches 14 connected between the charging units 13 are turned off, all the charging units 13 are connected in parallel to charge the device 2 to be charged together. At this time, the power supply device 1 can output a large charging current.

When the transfer switch 14 on the main charging branch is turned on, the transfer switches 14 on the slave charging branches are all turned off, and the transfer switch 14 connected between the two charging units 13 is turned on, and all the charging units 13 are connected in series to charge the device 2 to be charged together. At this time, the power supply device 1 can output a large charging voltage.

Referring to fig. 8, fig. 8 is a circuit portion connection diagram of a power supply apparatus 1 according to yet another embodiment. Two charging units 13 are exemplified herein for explanation. Specifically, the plurality of charging units 13 includes a first charging unit 133 and a second charging unit 134; the commutation switch 14 comprises a first commutation switch Q114, a second commutation switch Q214 and a third commutation switch Q314; a first end of the first shunting switch Q114 is connected to an input end of the first charging unit 133, and a second end of the first shunting switch Q114 is grounded; a first end of the second commutation switch Q214 is connected to the output end of the first charging unit 133, and a second end of the second commutation switch Q214 is connected to the output end of the second commutation switch Q214; a first end of the third shunting switch Q314 is connected to the input end of the first charging unit 133, and a second end of the third shunting switch Q314 is connected to the output end of the second charging unit 134; the controlled ends of the first switch Q114, the second switch Q214 and the third switch Q314 are all electrically connected to the control unit 15.

In this circuit, MOS transistors may be used for the first transfer switch Q114, the second transfer switch Q214, and the third transfer switch Q314. The controlled end is a grid electrode of the MOS tube, and the first end can be a source electrode or a drain electrode of the MOS tube.

Please refer to fig. 9 to 11; FIG. 9 illustrates a first mode of operation of the circuit of FIG. 8; FIG. 10 is a second mode of operation of the circuit of FIG. 8; FIG. 11 is a third mode of operation of the circuit of FIG. 8; here, the first charging unit 133 is set to have the same output power parameter, and the output power of the first charging unit 133 is used as a reference. The power supply device 1 has three operation modes.

The first working mode is as follows: the first commutation switch Q114 is turned on, the second commutation switch Q214 is turned on, and the third commutation switch Q314 is turned off; at this time, the first charging unit 133 and the second charging unit 134 are connected in parallel to output the charging power in common. At this time, the maximum output current of the power supply device 1 is doubled.

The second working mode is as follows: the first commutation switch Q114 is turned on, the second commutation switch Q214 is turned off, and the third commutation switch Q314 is turned on; at this time, the first charging unit 133 and the second charging unit 134 are connected in series to output the charging power in common. At this time, the maximum output voltage of the power supply device 1 is doubled.

The third working mode is as follows: the first commutation switch Q114 is turned on, the second commutation switch Q214 is turned off, and the third commutation switch Q314 is turned off; at this time, only the first charging unit 133 outputs the charging power alone. At this time, the maximum output voltage and the maximum output current of the power supply device 1 are kept unchanged.

Illustratively, in a specific output power configuration, when the first charging unit 133 and the second charging unit 134 are connected in series, the power supply apparatus 1 may output a voltage of 3.3V to 42V, (which may be 3.3V to 21V to match the charging voltage required by the mobile phone), and output a charging current of 2 times. When two power supply devices 1 are connected in series, the power output of 3.3V-10V, 10A or 3.3V-20V, 5A, namely 100W, can be achieved.

There are many embodiments regarding the control unit 15 controlling the on/off of the switch 14 to coordinate the main charging unit 131 and the slave charging unit 132. In one embodiment, if the power required to be output by the power supply apparatus 1 is less than or equal to the maximum output power of the main charging unit 131, the control unit 15 controls the on/off of the switch 14 to turn off the branch where the slave charging unit 132 is located, so that the main charging unit 131 outputs power alone.

Specifically, the power that the power supply apparatus 1 needs to output is determined according to the charging power requested by the device to be charged 2 or the allowed charging power. By performing communication handshake with the device to be charged 2 through the protocol chip 1315 in the main charging unit 131, the charging power requested by the device to be charged 2 or the allowed charging power can be known.

Further, in the case where the power that the power supply apparatus 1 needs to output is larger than the maximum output power of the main charging unit 131, the slave charging unit 132 is connected in parallel or in series with the main charging unit 131 under the coordination of the control unit 15 to output the power in common.

Under the condition that the power required to be output by the power supply apparatus 1 is greater than the maximum output power of the main charging unit 131, the single main charging unit 131 cannot meet the power requirement of the device to be charged 2, and at this time, the control unit 15 adjusts the switch 14 to obtain one or more slave charging units 132, and cooperates with the main charging unit 131 to connect in series or in parallel to output power together.

Further, when there is a common output power of the plurality of charging units 13, the control unit 15 adjusts and controls the output powers of the main charging unit 131 and the auxiliary charging unit 132 of the common output power according to the charging power required by the device to be charged 2, so that the output power of the power supply apparatus 1 matches the charging power required by the device to be charged 2.

Specifically, the power equalized by the master charging unit 131 and each slave charging unit 132 that output power in common is controlled according to the desired charging power requested or allowed by the device to be charged 2.

The master charging unit 131 and each slave charging unit 132, which output power in common, may also be controlled to output power in a preset ratio. For example, the ratio of the output power of the main charging unit 131 to the output power of the sub-charging unit 132 is set to 2: 1.

in an embodiment, when the plurality of charging units 13 are required to cooperate with the output power together, the control unit 15 is further configured to control the plurality of charging units 13 to be connected in parallel or in series according to the maximum current allowed to pass through by the charging loop for the charging loop formed by the charging branch and the charging path in the device to be charged 2.

If the charging path has a large current supporting capability, each charging unit 13 may be connected in parallel to operate, and the device to be charged 2 is charged with a large current. When the conducting wire of the charging path is thin and the allowed current is small, the charging units 13 can be connected in series to work, and the device to be charged 2 is charged with large voltage.

In one embodiment, the charging unit 13 is provided in a modular configuration, and the charging unit 13 has a power interface for connecting the power input terminal 11 and the power output terminal 12, and a combination interface for connecting other charging units 13 in parallel or in series. Therefore, a plurality of charging units 13 can be flexibly and reasonably selected and matched for assembly or power expansion according to the range of the output power to be achieved. And if a certain charging unit 13 is in a working fault, the charging unit 13 arranged in a modularized mode is convenient to replace, so that the maintenance cost is greatly reduced.

In one embodiment, a plurality of the charging units 13 are arranged in a stacked manner. Specifically, a plurality of charging units may be disposed in a stacked manner in the package space from bottom to top, thereby reducing the size of the power supply apparatus.

According to the power supply device 1 provided by the present disclosure, the plurality of charging units 13 and the plurality of commutation switches 14 capable of adjusting the series connection or the parallel connection between the plurality of charging units 13 are provided, and by controlling the on/off of the commutation switches 14, it is possible to realize that one charging unit 13 operates alone, or the plurality of charging units 13 output power in series or in parallel, and therefore the power supply device 1 can output power in a wide range.

Moreover, compared with the conventional power supply device 1 with only one charging circuit, the power supply device 1 provided by the present disclosure reduces the power required to be output in each charging unit 13 by arranging a plurality of charging units 13 to match with the output of the same power, so that the buffer capacitor in each charging unit 13 does not need to bear a large withstand voltage value and a storage capacity, and a capacitor with a small capacitance value can be selected, thereby reducing the space occupied by the capacitor in each charging unit 13 and realizing the miniaturization of the power supply device 1.

In conclusion, the scheme of the present disclosure achieves miniaturization of the power supply apparatus 1, and increases the power output range, thereby improving the adaptability with more devices to be charged 2.

The device to be charged 2 mentioned in the present disclosure may be a multi-cell terminal, and receiving a large charging current may be achieved by parallel connection of multiple cells; and large charging voltage can be received by connecting a plurality of battery cores in series. And the terminal of many electric cores can also be provided with the series-parallel switching device who is used for cooperating with the power supply device of this disclosure to change many electric cores connected mode, thereby with the electric energy characteristics looks adaptation that the power supply device provided.

The battery (electric core) may include the following charging stages in the charging process: trickle charge stage, constant current charge stage, constant voltage charge stage.

In the trickle charge stage, the battery discharged to a preset voltage threshold is pre-charged (namely recovery charging), the trickle charge current is usually one tenth of the constant current charge current, and when the battery voltage rises above the trickle charge voltage threshold, the charge current is increased to enter the constant current charge stage.

In the constant current charging stage, the battery is charged with a constant current, the voltage of the battery rises rapidly, and when the voltage of the battery reaches a voltage threshold (or cut-off voltage) expected by the battery, the constant voltage charging stage is carried out.

During the constant voltage charging phase, the battery is charged at a constant voltage, the charging current is gradually reduced, and when the charging current is reduced to a set current threshold (the current threshold is usually one tenth or lower of the charging current value during the constant current charging phase, alternatively, the current threshold may be several tens of milliamperes or lower), the battery is fully charged.

In addition, after the battery is fully charged, a part of current loss occurs due to the influence of self-discharge of the battery, and then the process proceeds to a recharge stage. During the boost charging phase, the charging current is small only to ensure that the battery is at full charge.

It should be noted that the constant current charging phase mentioned in the embodiments of the present disclosure does not require that the charging current is kept completely constant, and for example, it may generally mean that the peak value or the average value of the charging current is kept constant for a period of time.

In practice, the constant current charging stage may also adopt a Multi-stage constant current charging (Multi-stage constant current charging) manner for charging.

The segmented constant-current charging may have M constant-current stages (M is an integer not less than 2), the segmented constant-current charging starting the first-stage charging with a predetermined charging current, the M constant-current stages of the segmented constant-current charging being sequentially performed from the first stage to the mth stage. When the previous constant current stage in the constant current stages is converted into the next constant current stage, the current can be reduced; when the battery voltage reaches the charging voltage threshold corresponding to the constant current stage, the next constant current stage is switched to. The current conversion process between two adjacent constant current stages can be gradual change or step jump change.

As can be seen from the above description, during the charging process of the battery, the charging current is the largest in the constant current charging stage, so that the voltage of the battery rapidly increases.

In some embodiments, the control unit may further determine the voltage value output by each charging unit according to the charging phase in which the device to be charged is fed back. For example, in the trickle charge stage and/or the constant voltage charge stage, the charging voltage and/or the charging current required by the device to be charged is small, so the main charging unit can choose to supply power to the device to be charged only by itself, i.e., determine the voltage value output from the charging unit to be 0. In the constant-current charging phase, the charging current and/or the charging voltage are required to be larger, so that the power can be supplied by the charging unit and the slave charging unit.

The following are embodiments of the disclosed method, which may be applied to embodiments of the disclosed apparatus. For details not disclosed in the embodiments of the disclosed method, refer to the embodiments of the disclosed apparatus.

Fig. 12 is a flow diagram illustrating a charge control method according to an embodiment. The charging control method can be applied to the power supply device 1 described above.

A charging control method includes:

31, obtaining a desired charging power requested or allowed by the device to be charged 2;

and 32, controlling one charging unit 13 to work alone or a plurality of charging units 13 to work in parallel or in series according to the expected charging power.

Referring to fig. 13, fig. 13 is a flowchart illustrating a charging control method according to another embodiment. In one embodiment, the plurality of charging units 13 of the power supply apparatus 1 are divided into a master charging unit 131 and a plurality of slave charging units 132;

and 32, controlling one charging unit 13 to work alone or a plurality of charging units 13 to work in parallel or in series according to the desired charging power, and comprising:

321, if the requested or allowed charging power of the device to be charged 2 is less than or equal to the output power of the main charging unit 131, controlling the branch where the slave charging unit 132 is located to be turned off, and controlling the main charging unit 131 to output power independently;

322, if the requested or allowed charging power of the device to be charged 2 is larger than the output power of the main charging unit 131, controlling one or more slave charging units 132 to be connected in parallel or in series with the main charging unit 131 to output power together.

In one embodiment, if the requested or allowed charging power of the device to be charged 2 is greater than the output power of the main charging unit 131, controlling one or more slave charging units 132 to be connected in parallel or in series with the main charging unit 131 to output power together includes:

if the requested or allowed charging power of the device to be charged 2 is greater than the output power of the main charging unit 131, acquiring the maximum current allowed by the charging loop for the charging loop formed by the charging branch and the charging path in the device to be charged 2;

one or more slave charging units 132 work in parallel or in series with the master charging unit 131, depending on the maximum current allowed to pass through the charging circuit.

controlling the power equalized by the master charging unit 131 and each slave charging unit 132 that output power in common according to the desired charging power requested or allowed by the device to be charged 2; or the main charging unit 131 and each of the slave charging units 132, which control the common output power, output power in a preset ratio.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A power supply device is provided with an electric energy input end for connecting an external power supply and an electric energy output end for connecting equipment to be charged; characterized in that the power supply device comprises:

and the control unit controls the on-off of the path changing switch so as to enable the plurality of charging units to be connected in series or in parallel.

2. The power supply device according to claim 1, wherein at least one said transfer switch is connected in series to each said charging branch;

at least one of the commutation switches is connected in series between the output end of each charging unit and the input end of the other charging unit.

3. The power supply device according to claim 1, wherein one of the charging units is a main charging unit; the rest of the charging units are slave charging units;

if the power supply device needs to output power from the electric energy output end less than or equal to the maximum output power of the main charging unit, the control unit controls the on-off of the commutation switch to turn off the charging branch where the slave charging unit is located, so that the main charging unit outputs power independently.

4. The power supply device according to claim 3, wherein if the power required by the power supply device to be output from the power output terminal is greater than the maximum output power of the main charging unit, the control unit controls the on/off of the commutation switch to connect some or all of the slave charging units in parallel or in series with the main charging unit to output power together.

5. The power supply device according to claim 4, wherein the control unit is further configured to communicate with the device to be charged to determine a target power to be output; and regulating and controlling the output power of the main charging unit and the slave charging unit which output power together according to the target power.

6. The power supply device according to claim 3, wherein the control unit is further configured to control the plurality of charging units to be connected in parallel or in series according to a maximum current allowed to pass through the charging loop for a charging loop formed by the charging branch and a charging path in the device to be charged.

7. The power supply device according to claim 3, wherein the control unit is a protocol chip in the main charging unit.

8. The power supply device according to claim 1, wherein the plurality of charging units includes a first charging unit and a second charging unit; the circuit changing switch comprises a first circuit changing switch, a second circuit changing switch and a third circuit changing switch;

9. The power supply device according to claim 1, wherein the charging units are arranged in a modular manner, and each charging unit has a power interface for connecting the power input end and the power output end, and a combined interface for connecting other charging units in parallel or in series.

10. The power supply device according to claim 1, wherein a plurality of the charging units are arranged in a stacked manner.

11. The power supply device according to any one of claims 1 to 10, wherein the charging unit includes:

12. The power supply device according to claim 11, wherein the transforming module comprises: a switch module and a transformer; the charging unit further comprises a first detection module and a power supply control module, and the first detection module and the power supply control module are used for detecting the voltage and/or the current of the pulsating direct current;

13. The power supply device according to claim 12, wherein the charging unit further comprises:

14. The power supply device according to any one of claims 12, wherein the charging unit further includes:

15. A charging control method for use in a power supply apparatus, the method comprising:

16. The charge control method according to claim 15, wherein the plurality of charging units of the power supply device are divided into one master charging unit and a plurality of slave charging units;

17. The charging control method of claim 15, wherein the controlling the one or more slave charging units to be connected in parallel or in series with the main charging unit to output power together if the charging power requested or allowed by the device to be charged is greater than the output power of the main charging unit comprises:

18. The charging control method of claim 15, wherein the controlling the one or more slave charging units to be connected in parallel or in series with the main charging unit to output power together if the charging power requested or allowed by the device to be charged is greater than the output power of the main charging unit comprises: