WO2022007668A1 - Power supply apparatus and charging control method - Google Patents

Abstract

Provided are a power supply apparatus and a charging control method. The power supply apparatus (1) comprises a plurality of charging units (13), a plurality of circuit switching switches (14), and a control unit (15); the plurality of charging units (13) are connected between an electric energy input end (11) and an electric energy output end (12), and each charging unit (13) forms an independent charging branch with the electric energy input end (11) and the electric energy output end (12); each circuit switching switch (14) among the plurality of circuit switching switches (14) is connected in series to one charging branch, or is electrically connected between two charging units (13); and the control unit (15) controls turn-on and turn-off of the circuit switching switches (14), so as to cause the plurality of charging units (13) to be connected in series or in parallel. By means of the invention, the miniaturization of the power supply apparatus (1) is achieved, and a power output range is increased.

Description

Power supply device and charging control method

cross reference

The present disclosure claims the priority of a Chinese patent application with application number 202010664256.8 filed on July 10, 2020, both titled "Power Supply Device and Charging Control Method", the entire contents of which are incorporated herein by reference in their entirety.

technical field

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

Background technique

With the widespread application of electronic devices (such as smart phones, tablet computers, and other smart terminal devices), their functions are increasing, but their power consumption is also increasing accordingly, requiring frequent charging. In order to speed up the charging speed, the corresponding power adapter needs to be able to output more power.

However, the current power adapters capable of outputting high power are all bulky, inconvenient to carry around, 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 form the prior art that is already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

An object of the present disclosure is to provide a power supply device with a smaller volume.

Another object of the present disclosure is to provide a device with .

In order to solve the above-mentioned technical problems, the present disclosure adopts the following technical solutions:

According to one aspect of the present disclosure, the present disclosure provides a power supply device, which has a power input terminal for connecting an external power source and a power output terminal for connecting a device to be charged; the power supply device includes:

A plurality of charging units, the plurality of charging units are connected between the power input terminal and the power output terminal, and each charging unit forms an independent charging branch with the power input terminal and the power output terminal road;

a plurality of change-over switches, each of the plurality of change-over switches is connected in series with one of the charging branches, or is electrically connected between two of the charging units;

The control unit controls the on-off of the switch, so as to connect a plurality of the charging units in series or in parallel, so as to increase the output power of the power supply device.

According to an embodiment of the present disclosure, each of the charging branches is connected in series with at least one of the transfer switches;

In the plurality of charging units, at least one switch is connected in series between the output terminal of each charging unit and the input terminal of another charging unit.

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

If the power required to be output by the power supply 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 switch to turn off the charging branch where the secondary charging unit is located. off, so that the main charging unit outputs power independently.

According to an embodiment of the present disclosure, if the power that the power supply device needs to output is greater than the maximum output power of the main charging unit, the control unit controls the on-off of the switch to make some or all of the The slave charging unit is connected in parallel or in series with the master charging unit to jointly output power.

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 that needs to be output; and according to the target power, regulate the main charging unit, all the main charging units that jointly output power the output power from the charging unit.

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

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 include a first charging unit and a second charging unit; the switch includes a first switch, a second switch, and a third switch;

The first end of the first switch is connected to the input end of the first charging unit, and the second end of the first switch is grounded;

The first end of the second switch is connected to the output end of the first charging unit, and the second end of the second switch is connected to the output end of the second switch;

The first terminal of the third switch is connected to the input terminal of the first charging unit, and the second terminal of the third switch is connected to the output terminal of the second charging unit;

The controlled ends of the first switch, the second switch, and the third switch are all electrically connected to the control unit.

According to an embodiment of the present disclosure, the charging unit is in a modular configuration, and the charging unit has a power interface for connecting the power input terminal and the power output terminal, and also has a parallel connection or series connection for other charging units. composite interface.

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

at least one filter capacitor, the capacity of the at least one filter capacitor is less than a preset threshold, and is used for filtering the rectified AC current to obtain a pulsating DC current;

The transformation module is used for transforming the pulsating DC current to obtain voltage and current for charging the device to be charged.

According to an embodiment of the present disclosure, the transformer module includes: a switch module and a transformer; the charging unit further includes a first detection module and a power supply control module, configured to perform a voltage measurement on the voltage and/or current of the pulsating DC current. detection;

The power control module is configured to control the conduction time of the switch module according to the detection result of the voltage and/or current of the pulsating DC current, so as to control the output power of the transformer.

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

an operational amplifier module, configured to convert the voltage value of the pulsating DC 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 is connected to the first detection module;

The power control module is further configured to: control the on-time of the switch module according to the converted current value, so as to control the output power of the transformer.

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

The clamping module is used for absorbing leakage inductance energy of the transformer when the switching module is turned off, and releasing the absorbed energy to the output end of the transformer.

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

Obtain the expected charging power requested or allowed by the device to be charged;

According to the desired charging power, one of the charging units is controlled to work alone, or a plurality of the charging units work together in parallel or in series.

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;

According to the expected charging power, controlling one of the charging units to work alone, or a plurality of the charging units to work together in parallel or in series, including:

If the charging power requested or allowed by the device to be charged is less than or equal to the output power of the primary charging unit, controlling the branch where the secondary charging unit is located to be turned off, and controlling the primary charging unit to output power independently;

If the charging power requested or allowed by the device to be charged is greater than the maximum output power of the primary charging unit, control the one or more secondary charging units to be connected in parallel or in series with the primary charging unit to jointly output power.

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 maximum output power of the primary charging unit, the one or more secondary charging units are controlled to communicate with the primary charging unit. The main charging units are connected in parallel or in series to jointly output power, including:

If the charging power requested or allowed by the device to be charged is greater than the maximum output power of the main charging unit, obtain the charging circuit formed by the charging branch and the charging path in the device to be charged. The maximum current allowed by the loop;

According to the maximum current allowed by the charging circuit, the one or more secondary charging units and the primary charging unit work in parallel or in series.

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 maximum output power of the primary charging unit, the one or more secondary charging units are controlled to communicate with the primary charging unit. The main charging units are connected in parallel or in series to jointly output power, including:

According to the desired charging power requested or allowed by the device to be charged, control the equal power of the master charging unit and each of the slave charging units that output power together; or control the master charging unit and Each of the secondary charging units outputs power according to a preset ratio.

The power supply device provided by the present disclosure includes a plurality of charging units, and a plurality of switch switches capable of adjusting the series connection mode or parallel connection mode between the plurality of charging units. By controlling the on-off of the switch switches, a The charging unit works alone, or multiple charging units jointly output power in a series or parallel manner, so the power supply device can output a wide range of power, which improves the charging adaptability with more devices to be charged.

In addition, compared with the existing power supply device with only one charging circuit, when the present disclosure provides multiple charging units to match the output power of the same size, the required output power in each charging unit is reduced, thereby enabling charging The buffer capacitor inside the unit does not need to bear a larger withstand voltage value and storage capacity, and a capacitor with a smaller capacitance value can be selected, thereby reducing the space occupied by the capacitor in the charging unit and realizing the miniaturization of the power supply device.

To sum up, the solution of the present disclosure realizes the miniaturization of the power supply device and increases the power output range.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the present disclosure.

Description of drawings

The above and other objects, features and advantages of the present disclosure will become more apparent from the detailed description of example embodiments thereof with reference to the accompanying drawings.

1 is a schematic diagram illustrating the connection between a power supply device and a device to be charged according to an embodiment;

FIG. 2 is a schematic diagram showing the connection of a circuit part of a power supply device according to an embodiment;

3 is a schematic diagram of a circuit connection of a charging unit according to an embodiment;

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

5 is a schematic structural diagram of a charging system provided by an embodiment of the present application;

6 is a schematic structural diagram of a charging system provided by another embodiment of the present application;

FIG. 7 is a schematic diagram showing the connection of a circuit part of a power supply device according to another embodiment;

FIG. 8 is a schematic diagram showing the connection of a circuit part of a power supply device according to still another embodiment;

Fig. 9 is the first working mode of the circuit of Fig. 8;

Fig. 10 is the second working mode of the circuit of Fig. 8;

Fig. 11 is the third working mode of the circuit of Fig. 8;

12 is a flowchart of a charging control method according to an embodiment;

FIG. 13 is a flowchart of 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, however, can be embodied in various 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 repeated descriptions 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 in order to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other instances, well-known structures, methods, devices, implementations, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the present disclosure.

In the present disclosure, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection It can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

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

The preferred embodiments of the present disclosure will be further elaborated below with reference to the accompanying drawings of the present specification.

FIG. 1 is a schematic diagram of a charging system according to an exemplary embodiment.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram illustrating a connection between a power supply device 1 and a device to be charged 2 according to an embodiment.

Wherein, the power supply device 1 is, for example, a power adapter, a power bank, and other equipment. The power supply device 1 is connected with the device to be charged 2 through a cable, and provides power for the device to be charged 2 to charge the battery in the device to be charged 2 .

The type of the power supply device 1 can be classified into, for example, a normal charging type and a quick charging type. Compared with the common charging type power supply device 1 , the fast charging type power supply device 1 can provide a larger output power for the device to be charged 2 . The maximum output power of the common charging type power supply device 1 is, for example, 10W (5V/2A). The fast charging type can be further divided into a first fast charging type and a second fast charging type. The maximum output power of the power supply device 1 of the first fast charging type is, for example, 20W (5V/4A); the maximum output power of the power supply device 1 of the second fast charging type is, for example, 50W (10V/5A).

The device 2 to be charged can be, for example, a terminal or an electronic device, and the terminal or electronic device can be a mobile phone, a game console, a tablet computer, an e-book reader, a smart wearable device, an MP4 (Moving Picture Experts Group Audio Layer IV, a video expert compression standard Audio level) players, smart home devices, AR (Augmented Reality, augmented reality) devices, VR (Virtual Reality, virtual reality) devices and other mobile terminals; it can also be mobile power sources (such as power banks, travel chargers), electronic cigarettes, A rechargeable electronic device with a charging function, such as a wireless mouse, a wireless keyboard, a wireless earphone, a Bluetooth speaker, etc.; or, a personal computer (Personal Computer, PC), such as a laptop portable computer and a desktop computer, etc.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram showing the connection of a circuit part of the power supply device 1 according to an embodiment. In one embodiment, the power supply device 1 has a power input terminal 11 for connecting an external power source and a power output terminal 12 for connecting the device 2 to be charged; the power supply device 1 includes a plurality of charging units 13 and a plurality of switch switches 14 , and the control unit 15 . A 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 forms an independent charging branch with the electric energy input end 11 and the electric energy output end 12; among the plurality of switch switches 14, wherein Part of the change-over switches 14 are connected in series on the charging branch, and the other part of the change-over switches 14 are connected between the two charging units 13; the control unit 15 controls the on-off of the change-over switches 14, so that the plurality of charging units 13 are connected in series or Connect in parallel to increase the output power of the power supply device 1 .

The charging unit 13 is used for converting the AC power into DC power, and is used for charging the battery in the device 2 to be charged. The power output terminal 12 may be a USB interface, specifically a TYPE-C interface. The charging interface can be, for example, a USB interface that complies with the USB 2.0 specification, the USB 3.0 specification, or the USB 3.1 specification, including: a Micro USB interface or a USB TYPE-C interface. In some embodiments, the charging port may also be a lightning port, or any other type of parallel port or serial port that can be used for charging.

Correspondingly, the charging interface on the device to be charged 2 may be a male connector of a USB interface or Lightning interface that is compatible with the charging interface and meets the USB 2.0 specification, the USB 3.0 specification or the USB 3.1 specification.

For example, 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 need not set up additional communication interfaces or other wireless communication modules. If the charging interface and the charging interface are USB interfaces, the power supply device 1 and the device to be charged 2 can communicate based on data lines (eg, D+ and/or D- lines) in the USB interface. Another example is that the charging interface and the charging interface are USB interfaces (such as USB TYPE-C interfaces) that support the power transfer (PD) communication protocol, then the power supply device 1 and the device to be charged 2 can communicate based on the PD communication protocol. In addition, the power supply device 1 and the device to be charged 2 can also communicate through other communication methods other than the charging interface and the charging interface. For example, the power supply device 1 and the device to be charged 2 communicate through wireless means, such as near field communication (NFC).

Taking both the charging interface and the charging interface as USB interfaces as an example, when the device to be charged 2 and the power supply device 1 are connected by a cable, the device to be charged 2 identifies whether the connection port provided by the power supply device 1 is a dedicated charging port ( Dedicated Charging Port, DCP), this port does not support data transmission and can provide a charging current of more than 1.5A, and the D+ and D- lines of the port are short-circuited. This type of port can support higher charging capacity chargers and car chargers. Specifically, the device to be charged 2 identifies whether the connection port provided by the power supply device 1 is a DCP through the BC2.1 protocol. BC2.1 is the USB charging specification, which regulates the detection, control and reporting mechanism of device charging through the USB port. The BC2.1 protocol is well known to those of ordinary skill in the art, and in order to avoid obscuring the present disclosure, details are not repeated here.

When the device 2 to be charged recognizes that the port provided by the power supply device 1 is DCP, it can further identify the type of the power supply device 1 by setting D+/D- to load different preset communication levels respectively.

Please refer to FIG. 3 , which is a schematic diagram of a circuit connection of a charging unit according to an embodiment.

The charging unit 13 in the present application will be described in the following embodiments. The charging unit 13 has at least one filter capacitor and a transformer module, and the capacity of the at least one filter capacitor is less than a preset threshold, and is used to filter the rectified AC current to obtain a pulsating DC current; the transformer module is used to The pulsating DC current is transformed to obtain the voltage and current for charging the device to be charged.

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

Specifically, the filter capacitor uses a smaller MLLCC capacitor (chip capacitor) or film capacitor, which can reduce the volume of the adapter; the number of MLLCC capacitors or film capacitors can be one or more, and the connection relationship can be series or It can be connected in parallel, which is mainly determined by the capacity of the required capacitor.

In the charging unit 13 provided by the embodiment of the present application, the capacity of the filter capacitor in the charging unit 13 is smaller than a certain threshold, which can reduce the volume of the filter capacitor, thereby reducing the volume of the charging unit 13 and realizing the miniaturization of the power supply device. .

Optionally, in some embodiments, as shown in FIG. 3 , the transformer module 220 may include a switch 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 detection module 231 is configured to detect the voltage and/or current of the pulsating DC current. The power control module 240 is configured to control the on-time of the switch module according to the detection result of the voltage and/or current 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 switching power supply 113 , and the first detection module may be a voltage division detection circuit. The first detection module 231 in the embodiment of the present application can detect the voltage of the DC current obtained after filtering by the filter capacitor 210 , so that the power control module 240 can control the switch module according to the voltage of the DC current detected by the first detection module 231 221 turn-on time.

Similarly, the first detection module 231 can detect the current of the DC current obtained after filtering by the filter capacitor 210, so that the power control module 240 can control the conduction of the switch module 221 according to the magnitude of the DC current detected by the first detection module 231. pass time.

It is explained above that the control module can control the on-time of the switch module according to the voltage and/or current magnitude of the pulsating DC current detected by the first detection module. On-time of the module.

Optionally, in some embodiments, the control module is further configured to: reduce the on-time of the switch module when the voltage of the pulsating DC current is less than a first preset voltage threshold; and/or When the current of the pulsating DC current is less than the first preset current threshold, the on-time of the switch module is reduced.

In the embodiments of the present application, voltage is used as an example for description. In the present application, the first detection module 231 can detect the voltage of the pulsating DC current filtered by the filter capacitor 210 to control the on-time of the switch module 221. If the voltage of the pulsating DC current detected by the first detection module 231 is smaller than the first When the preset voltage threshold, for example, is less than 100V, the power control module 240 can control to reduce the on-time of the switch module 221, so that the output power can be reduced when the voltage input to the charging unit 13 is low, and further, the charging can be improved The output efficiency of the unit 13 as a whole.

It should be understood that the conduction time of the switch module 221 may be related to the current flowing through the switch module 221 , that is, the longer the conduction time of the switch module 221 is, the greater the current flowing through the switch module 221; the conduction of the switch module 221 The shorter the time, the smaller the current flowing through the switch module 221 .

Similarly, the on-time of the switch module 221 can also be controlled by detecting the magnitude of the pulsating DC current filtered by the filter capacitor 210 by the first detection module 231 , which is not repeated here for brevity.

FIG. 4 is a schematic diagram of a circuit connection 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 . an operational amplifier module 250, configured to convert the voltage value of the pulsating DC 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 is connected to the first detection module; The control module is further configured to: control the on-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 less than a second preset current threshold.

In the embodiment of the present application, the voltage of the pulsating DC current output by the filter capacitor 210 can be converted by the operational amplifier module 250, and the voltage can be converted into a current. The first detection module 231 detects the current obtained after the conversion, and the power control module 240 can The turn-on time of the switch module 221 is adjusted 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 turn-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, which is less than the second preset current threshold, the power control module 240 can control to reduce the current flowing through the switch module 221 The current, for example, can be controlled to reduce the on-time of the switch module 221 , thereby reducing the output power when the voltage input to the charging unit 13 is low, and further improving 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 . The second detection module 232 is configured to detect the current and/or voltage output by the secondary side of the transformer 222; the power control module 240 is further configured to: according to the current output from the secondary side of the transformer and/or Or the voltage detection result, combined with the voltage and/or current detection result of the pulsating DC current, the on-time of the switch module is controlled to control the output power of the transformer.

In the embodiments of the present application, voltage is used as an example for description. In the present application, the on-time of the switch module 221 can also be controlled by detecting the voltage level output by the secondary side of the transformer 222 and combining with the voltage level of the pulsating DC current. is less than the preset threshold, for example, less than 10V, and the voltage of the pulsating DC current is less than the preset threshold, for example, less than 30V, the power control module 240 can control to reduce the on-time of the switch module, so as to reduce the input charging unit The output power when the voltage of the charging unit 13 is low, and further, the overall output efficiency of the charging unit 13 can be improved.

Controlling the on-time of the switch module according to the magnitude of the current is similar to the above method, and for the sake of brevity, details are not repeated here. As shown in FIG. 5 , it is a schematic structural diagram of a charging system provided in the implementation of the present application. The charging system 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 this embodiment of the present application may include a rectifier module 510 , a filter module 520 , a conversion module 530 , an operational amplifier module 540 , a first control module 550 , a second control module 560 , and a switch module 570 . The filter module 520 in this embodiment of the present application may include a filter C1, where the filter C1 may be the filter capacitor 210 described above, the switch module 570 may be the switch module 221 described above, and the transformation module 530 may be the transformer described above 222. Both the first control module 550 and the second control module 560 may be the power control module 240 described above.

In the embodiment of the present application, when the switch module 570 is disconnected, 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 disconnected state, the AC current input through the input interface passes through the rectifier module After 510 and the filter module 520, the output DC current will directly charge the battery through the conversion module 530, however, excessive DC current will cause damage to the charging unit 13. Therefore, the charging unit 13 can be further improved, which 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 leakage inductance energy of the transformer when the switch module is disconnected , and release the absorbed energy to the output of the transformer.

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

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

Due to the existence of the clamp module 580 , the rigidity of the switch tube included in the switch module 570 can be reduced, and the switch tube with lower conduction rate can be used, thereby reducing the cost and improving the conversion efficiency of the charging unit 13 .

It should be understood that the clamp module 580 and the switch module 570 in this embodiment of the present application work in a complementary mode, that is, when the switch module 570 is in a closed state, the clamp module 580 can be disconnected; when the switch module 570 is in an open state, The clamp module 580 can be closed.

Specifically, when the switch module 570 is in the closed state, the clamp module 580 can be disconnected. In this case, the DC current output after passing through the filter can be chopped by the switch module 570 and then processed by the conversion module 530. The resulting DC current can be used to charge the battery; when the switch module 570 is in an open state, the clamp module 580 can be closed, in which case some or all of the leakage inductance energy of the transformer can be released by the clamp module 580 After absorption, the clamping module 580 releases the absorbed energy to the output terminal of the conversion module 530 for charging the battery.

Please refer to FIG. 3 , which is a schematic diagram of circuit connection of the charging unit 13 according to an embodiment. In an embodiment of the charging unit 13 , the charging unit 13 may include a first-level rectifier circuit 1311 , a transformer chopper circuit 1312 , and a second-level rectifier circuit 1314 that are electrically connected in sequence. The rectifier circuit may be a rectifier bridge circuit, and the transformer chopper circuit 1312 may specifically include a power transformer and an AC-DC power management chip 1313 .

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

The secondary rectifier circuit 1314 is connected to the secondary side of the transformer, and is used to further rectify the steamed bread wave output from the secondary side of the transformer, so as to output a stable DC power supply.

A protocol chip 1315 is also provided on the secondary side of the transformer. The protocol chip 1315 is used to shake hands with the device to be charged 2 to obtain the charging power requested by the device to be charged 2, so as to further communicate with the AC-DC power management chip 1313 , so that the AC-DC power management chip 1313 regulates the switching frequency of the switch control terminal, thereby regulating the output voltage of the secondary side of the power transformer.

It should be understood that when the device 2 to be charged is charged through the power supply device 1, it can request the power supply device 1 through a communication channel with the power supply device 1 (eg, through the data line D+/D- in the USB interface). The amount of charging voltage and/or charging current required or allowed to meet its charging needs.

The control unit 15 can be provided with the protocol chip 1315 in the main charging unit 131, so that there is no need to separately provide a control chip. The protocol chip 1315 of the main charging unit 131 can not only communicate with the device to be charged 2 to determine the power to be output by the power supply device 1, but also manage and coordinate the work of the power from the charging unit 132 by controlling the switch 14; The protocol chip 1315 can 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 common output power of the master charging unit 131 and the slave charging unit 132 is equal to The charging power requested or allowed by the device to be charged 2 matches.

It should be understood that the circuit structure of the above-mentioned charging unit 13 is not limited to this, and a charge pump circuit may also be used. As long as it is a circuit capable of performing AC-DC power conversion, it all falls within the protection scope of the present disclosure.

Please refer to FIG. 7 . FIG. 7 is a schematic diagram showing the connection of a circuit part of a power supply device 1 according to another embodiment. In one embodiment, one charging unit is set as the master charging unit 131 ; the other charging units 13 are the slave charging units 132 . The slave charging unit 132 is controlled by the master charging unit 131 . The branch where the master charging unit 131 is located is called the master charging branch, and the branch where the slave charging unit 132 is located is called the slave charging branch.

Regarding the circuit configuration, all the main charging units 131 and the secondary charging units 132 and the circuit architectures between the secondary charging units 132 may be the same or different. For example, the main charging circuit adopts the power conversion circuit with the above-mentioned transformer chopper circuit 1312 as the core, and the secondary charging unit 132 adopts the charge pump circuit. And, some of the secondary charging circuits use a power conversion circuit with the above-mentioned transformer chopper circuit 1312 as the core, and other charging circuits use 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 main 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 units 131 and the slave charging units 132 may use the exact same circuit structure and also use the exact same circuit parameters. Further, in this embodiment, in order to reduce the volume of the power supply device 1 and reduce the material cost, a protocol chip 1315 can be provided only in the main charging unit 131 for communicating with the device to be charged 2; the secondary charging unit 132 The protocol chip 1315 is not set inside.

As before, in order to coordinate the work among the plurality of charging units 13, the power supply device 1 further includes a plurality of switch switches 14 and a control unit 15, wherein some of the switch switches 14 are connected in series on the charging branch, and the other part of the switch The switch 14 is connected between the two charging units 13 . The control unit 15 controls the on-off of the switch 14 , so that the plurality of charging units 13 are connected in series or in parallel, so as to increase the output power of the power supply device 1 .

For one charging unit 13, the switch 14 connected in series on the charging branch of the charging unit 13 can control whether the charging branch can be turned on; the switch 14 connected between two charging units 13 can control the two Whether the charging units 13 can be connected in series.

When all the transfer switches 14 connected in series on the charging branch are turned on and the transfer switches 14 connected between the charging units 13 are turned off, all the charging units 13 are connected in parallel to jointly charge the charging device 2 . At this time, the power supply device 1 can output a relatively large charging current.

When the change-over switch 14 on the main charging branch is turned on, the change-over switches 14 on the secondary charging branch are turned off, and the change-over 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 charging device 2 together. At this time, the power supply device 1 can output a relatively large charging voltage.

Please refer to FIG. 8 . FIG. 8 is a schematic diagram showing the connection of a circuit part of a power supply device 1 according to yet another embodiment. Herein, the description is made by taking as an example that there are two charging units 13 . Specifically, the plurality of charging units 13 include a first charging unit 133 and a second charging unit 134; the switch 14 includes a first switch Q114, a second switch Q214, and a third switch Q314; the first switch The first end of the way switch Q114 is connected to the input end of the first charging unit 133, the second end of the first way switch Q114 is grounded; the first end of the second way switch Q214 is connected to the output end of the first charging unit 133 , the second terminal of the second switch Q214 is connected to the output terminal of the second switch Q214; the first terminal of the third switch Q314 is connected to the input terminal of the first charging unit 133, and the third switch Q314 The second end of the second charging unit 134 is connected to the output end of the second charging unit 134 ;

In this circuit, the first switch Q114, the second switch Q214, and the third switch Q314 can all use MOS transistors. The controlled end is the gate of the MOS tube, and the first end may be the source or the drain of the MOS tube.

Please refer to Fig. 9 to Fig. 11; wherein, Fig. 9 is the first working mode of the circuit of Fig. 8; Fig. 10 is the second working mode of the circuit of Fig. 8; Fig. 11 is the third working mode of the circuit of Fig. 8; Therefore, it is assumed that the first charging unit 133 has 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 working modes.

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

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

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

Illustratively, in terms of specific output power configuration, when the first charging unit 133 and the second charging unit 134 are connected in series, the power supply device 1 can output a voltage of 3.3V to 42V, (3.3V to 21V can be used to match the voltage of 3.3V to 21V. The charging voltage required by the mobile phone is adapted), and output twice the charging current. When two power supply device 1 circuits are used in series, a power output of 3.3V-10V, 10A or 3.3V-20V, 5A, that is, an output power of 100W, can be achieved.

There may be various embodiments for the control unit 15 to control the switch 14 to be turned on and off, so as to coordinate the work of the master charging unit 131 and the slave charging unit 132 . In one embodiment, if the required output power of the power supply device 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 secondary charging unit 132 is located. , so that the main charging unit 131 outputs power alone.

Specifically, the power that the power supply device 1 needs to output is determined according to the charging power requested by the device to be charged 2 or the allowed charging power. Through the communication handshake between the protocol chip 1315 in the main charging unit 131 and the device to be charged 2 , the charging power requested by the device to be charged 2 or the allowed charging power can be obtained.

Further, when the power required to be output by the power supply device 1 is greater than the maximum output power of the main charging unit 131, the secondary charging unit 132 and the main charging unit 131 are coordinated in parallel or in series under the coordination of the control unit 15 to jointly output power.

When the power required to be output by the power supply device 1 is greater than the maximum output power of the main charging unit 131 , the main charging unit 131 alone cannot meet the power requirement of the device to be charged 2 . One or more slave charging units 132 are fetched to be connected in series or parallel with the master charging unit 131 to jointly output power.

Further, when there are multiple charging units 13 jointly outputting power, the control unit 15 regulates the output power of the main charging unit 131 and the secondary charging unit 132 with the common output power according to the charging power required by the device to be charged 2, so that the power The power output by the providing device 1 matches the charging power required by the device to be charged 2 .

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

It is also possible to control the master charging unit 131 and each slave charging unit 132 that output power in common to output power according to a preset ratio. For example, the ratio of the output power of the main charging unit 131 to the output power of the secondary charging unit 132 is set to 2:1.

In one embodiment, when multiple charging units 13 are required to cooperate with the output power, the control unit 15 is also used for the charging circuit formed by the charging branch and the charging path in the device 2 to be charged, according to the allowable passage of the charging circuit. The maximum current of the control unit 13 is controlled to be connected in parallel or in series.

If the charging path has a large current support capability, each charging unit 13 can be operated in parallel, and at this time, the device 2 to be charged is charged with a large current. However, when the wires of the charging path are relatively thin and the allowable current is relatively small, each charging unit 13 can be operated in series, and at this time, the device 2 to be charged is charged with a high voltage.

In one embodiment, the charging unit 13 is arranged in a modular manner. The charging unit 13 has a power interface for connecting the power input terminal 11 and the power output terminal 12, and also has a combination interface for connecting other charging units 13 in parallel or in series. Therefore, according to the output power range to be achieved, a number of charging units 13 can be reasonably selected for assembly or power expansion. And if a certain charging unit 13 fails, the modular charging unit 13 is easy to replace, thereby greatly reducing maintenance costs.

In one embodiment, a plurality of the charging units 13 are arranged in a stacked manner. Specifically, a plurality of charging units may be arranged in a stacking manner in the packaging space from bottom to top, thereby reducing the volume of the power supply device.

The power supply device 1 provided according to the present disclosure includes a plurality of charging units 13 , and a plurality of switch switches 14 capable of adjusting the series connection or parallel connection between the plurality of charging units 13 . On and off, one charging unit 13 can work alone, or multiple charging units 13 can output power together in series or in parallel, so the power supply device 1 can output a wide range of power.

In addition, compared with the existing power supply device 1 with only one charging circuit, when the present disclosure provides multiple charging units 13 to match the output power of the same size, the required output power in each charging unit 13 is reduced, Therefore, the buffer capacitor inside the charging unit 13 does not need to bear a larger withstand voltage value and storage capacity, and a capacitor with a smaller capacitance value can be selected, thereby reducing the space occupied by the capacitor in the charging unit 13 and realizing the power supply device. 1 miniaturization.

To sum up, the solution of the present disclosure realizes the miniaturization of the power supply device 1 and increases the power output range, thereby improving the compatibility with more devices 2 to be charged.

The device to be charged 2 mentioned in the present disclosure may be a terminal of multiple cells, and a large charging current can be received by connecting multiple cells in parallel; a large charging voltage can be received by connecting multiple cells in series. In addition, the multi-cell terminal can also be provided with a series-parallel switching device for matching with the power supply device of the present disclosure, so as to change the connection mode of the multi-cell, so as to match the power characteristics provided by the power supply device.

The following method embodiments of the present disclosure can be applied to the device embodiments of the present disclosure. For details not disclosed in the method embodiments of the present disclosure, please refer to the device embodiments of the present disclosure.

FIG. 12 is a flowchart of a charging control method according to an embodiment. The charging control method can be applied to the above-mentioned power supply device 1 .

A charging control method includes:

31. Obtain the desired charging power requested or allowed by the device to be charged 2;

32. According to the desired charging power, control one charging unit 13 to work alone, or multiple charging units 13 to work together in parallel or in series.

Please refer to FIG. 13 , which is a flowchart of a charging control method according to another embodiment. In one embodiment, the plurality of charging units 13 of the power supply device 1 are divided into a master charging unit 131 and a plurality of slave charging units 132;

32. According to the desired charging power, control one charging unit 13 to work alone, or multiple charging units 13 to work together in parallel or in series, including:

321, if the charging power requested or allowed by the device to be charged 2 is less than or equal to the maximum output power of the primary charging unit 131, control the branch where the secondary charging unit 132 is located to be turned off, and control the primary charging unit 131 to output power independently;

322. If the charging power requested or allowed by the device to be charged 2 is greater than the maximum output power of the primary charging unit 131, control one or more secondary charging units 132 and the primary charging unit 131 in parallel or in series to jointly output power.

In one embodiment, if the charging power requested or allowed by the device to be charged 2 is greater than the maximum output power of the primary charging unit 131, one or more secondary charging units 132 are controlled in parallel or in series with the primary charging unit 131 to jointly output power, including:

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

According to the maximum current allowed by the charging circuit, one or more slave charging units 132 cooperate with the main charging unit 131 in parallel or in series.

In one embodiment, if the charging power requested or allowed by the device to be charged 2 is greater than the maximum output power of the primary charging unit 131, one or more secondary charging units 132 are controlled in parallel or in series with the primary charging unit 131 to jointly output power, including:

According to the desired charging power requested or allowed by the device 2 to be charged, control the equal power of the master charging unit 131 and each slave charging unit 132 with common output power; or control the master charging unit 131 and each slave charging unit with common output power The unit 132 outputs power according to a preset ratio.

While the present disclosure has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is of description and illustration, and not of limitation. Since the present disclosure can be embodied in many forms without departing from the spirit or spirit of the invention, it is to be understood that the above-described embodiments are not limited to any of the foregoing details, but are to be construed broadly within the spirit and scope defined by the appended claims Therefore, all changes and modifications that come within the scope of the claims or their equivalents should be covered by the appended claims.

Claims (20)

1. A power supply device has a power input terminal for connecting an external power source and a power output terminal for connecting a device to be charged; it is characterized in that, the power supply device comprises:

   A plurality of charging units, the plurality of charging units are connected between the power input terminal and the power output terminal, and each charging unit forms an independent charging branch with the power input terminal and the power output terminal road;

   a plurality of change-over switches, each of the plurality of change-over switches is connected in series with one of the charging branches, or is electrically connected between two of the charging units;

   The control unit controls the on-off of the switch, so as to connect a plurality of the charging units in series or in parallel.
2. The power supply device according to claim 1, wherein at least one of the transfer switches is connected in series with each of the charging branches;

   At least one switch is connected in series between the output terminal of each charging unit and the input terminal of another charging unit.
3. The power supply device according to claim 1, wherein one of the charging units is a master charging unit; the other charging units are slave charging units;

   If the power required by the power supply device to be output from the power output terminal is less than or equal to the maximum output power of the main charging unit, the control unit controls the on-off of the switch to make the secondary charging unit The charging branch where it is located is turned off, so that the main charging unit outputs power independently.
4. The power supply device according to claim 3, wherein if the power supply device needs to output power from the power output terminal greater than the maximum output power of the main charging unit, the control unit controls the The switching on and off of the switch makes part or all of the secondary charging unit and the primary charging unit in parallel or in series to jointly output power.
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 the target power that needs to be output; and according to the target power, regulate the output power of the common output power Output power of the master charging unit and the slave charging unit.
6. The power supply device according to claim 3, wherein, for the charging circuit formed by the charging branch and the charging path in the device to be charged, the control unit is further configured to allow the charging circuit to allow The maximum current passed, the plurality of charging units are controlled to be connected in parallel or in series.
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 include a first charging unit and a second charging unit; the switch includes a first switch, a second switch, the third switch;

   The first end of the first switch is connected to the input end of the first charging unit, and the second end of the first switch is grounded;

   The first end of the second switch is connected to the output end of the first charging unit, and the second end of the second switch is connected to the output end of the second switch;

   The first terminal of the third switch is connected to the input terminal of the first charging unit, and the second terminal of the third switch is connected to the output terminal of the second charging unit;

   The controlled ends of the first switch, the second switch, and the third switch are all electrically connected to the control unit.
9. The power supply device according to claim 1, wherein the charging unit is modularly arranged, the charging unit has a power interface for connecting the power input end and the power output end, and also has a power interface for other A combined interface in which the charging units are connected 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 comprises:

    at least one filter capacitor, the capacity of the at least one filter capacitor is less than a preset threshold, and is used for filtering the rectified AC current to obtain a pulsating DC current;

    The transformation module is used for transforming the pulsating DC current to obtain voltage and current for charging the device to be charged.
12. The power supply device according to claim 11, wherein the transformer module comprises: a switch module and a transformer; the charging unit further comprises a first detection module and a power supply control module, which are used to detect the pulsating DC current voltage and/or current for detection;

    The power control module is configured to control the on-time of the switch module according to the detection result of the voltage and/or current of the pulsating DC current, so as to control the output power of the transformer.
13. The power supply device according to claim 12, wherein the charging unit further comprises:

    an operational amplifier module, configured to convert the voltage value of the pulsating DC 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 is connected to the first detection module;

    The power control module is further configured to: control the on-time of the switch module according to the converted current value, so as to control the output power of the transformer.
14. The power supply device according to any one of claims 12, wherein the charging unit further comprises:

    The clamping module is used for absorbing leakage inductance energy of the transformer when the switching module is turned off, and releasing the absorbed energy to the output end of the transformer.
15. A charging control method used in a power supply device, characterized in that the method comprises:

    Obtain the expected charging power requested or allowed by the device to be charged;

    According to the desired charging power, one of the charging units is controlled to work alone, or a plurality of the charging units work together in parallel or in series.
16. The charging control method according to claim 15, wherein the plurality of charging units of the power supply device are divided into a master charging unit and a plurality of slave charging units;

    According to the expected charging power, controlling one of the charging units to work alone, or a plurality of the charging units to work together in parallel or in series, including:

    If the charging power requested or allowed by the device to be charged is less than or equal to the maximum output power of the primary charging unit, the branch where the secondary charging unit is located is controlled to be turned off, and the primary charging unit is controlled to output power independently .
17. The charging control method according to claim 16, wherein if the charging power requested or allowed by the device to be charged is greater than the maximum output power of the primary charging unit, controlling the one or more secondary charging units The charging unit is connected in parallel or in series with the main charging unit to jointly output power.
18. The charging control method according to claim 17, wherein, if the charging power requested or allowed by the device to be charged is greater than the maximum output power of the main charging unit, control the one or more charging The secondary charging unit is connected in parallel or in series with the primary charging unit to jointly output power, including:

    If the charging power requested or allowed by the device to be charged is greater than the maximum output power of the main charging unit, obtain the charging circuit formed by the charging branch and the charging path in the device to be charged. The maximum current allowed by the loop;

    According to the maximum current allowed by the charging circuit, the one or more secondary charging units and the primary charging unit work in parallel or in series.
19. The charging control method according to claim 17, wherein, if the charging power requested or allowed by the device to be charged is greater than the maximum output power of the main charging unit, control the one or more charging The secondary charging unit is connected in parallel or in series with the primary charging unit to jointly output power, including:

    According to the desired charging power requested or allowed by the device to be charged, control the equal power of the master charging unit and each of the slave charging units that output power together; or control the master charging unit and Each of the secondary charging units outputs power according to a preset ratio.
20. The charging control method according to claim 17, wherein the method comprises:

    communicate with the device to be charged to determine the target power to be output;

    According to the target power, the output power of the master charging unit and the slave charging unit that have a common output power is regulated.

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