Power supply device based on dynamic control of power threshold and wireless charging system

Abstract

The utility model belongs to power distribution technical field, concretely relates to a power device and wireless charging system based on power threshold dynamic control, and this power device includes: control module, load voltage detection unit, power factor correction unit and feedback voltage regulation unit, control module is still configured as control power factor correction unit starts or closes, and feedback voltage regulation unit is configured as with power factor correction unit synchronous action, to the total circuit output corresponding reference voltage signal, the utility model closes power factor correction unit in low power, reduces inherent loss in power factor correction unit, simultaneously, feedback voltage regulation unit output low reference voltage can reduce the front stage drive pressure difference, and activates power factor correction unit in high power, promotes the power factor of input voltage, and feedback voltage regulation unit output high reference voltage satisfies high power drive demand.

Description

Technical Field

[0001] This utility model belongs to the field of power distribution technology, specifically relating to power distribution circuit devices, and more particularly to a power supply device and wireless charging system based on dynamic control of power threshold. Background Technology

[0002] In switching power supply systems, power factor correction circuits are used to improve the power factor on the input side and reduce harmonic pollution, but they themselves have certain losses (such as inductor copper losses and switching transistor conduction losses).

[0003] Traditional power factor correction circuits operate across the full power range. When the output power is below 50% of the rated power (e.g., below 75W), the loss ratio of the power factor correction circuit increases significantly, leading to a decrease in system efficiency.

[0004] Therefore, there is an urgent need to develop a new power supply device and wireless charging system based on dynamic power threshold control to solve the technical problem of high losses caused by traditional power factor correction circuits operating across the full power range.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one power supply device and wireless charging system based on dynamic power threshold control.

[0007] In a first aspect, embodiments of this disclosure provide a power supply device based on dynamic control of a power threshold, comprising: a control module, a load voltage detection unit, a power factor correction unit, and a feedback voltage regulation unit; the load voltage detection unit, the power factor correction unit, and the feedback voltage regulation unit are electrically connected to the control module; the control module is configured to detect the voltage of the load through the load voltage detection unit; the control module is further configured to control the power factor correction unit to start or stop, and the feedback voltage regulation unit is configured to operate synchronously with the power factor correction unit to output a corresponding reference voltage signal to the main circuit.

[0008] In one optional embodiment, the load voltage detection unit includes: a plurality of sampling resistors; each of the sampling resistors is electrically connected to a control module and each of the sampling resistors is electrically connected to a load; the control module is configured to detect the load voltage through each sampling resistor.

[0009] In one optional embodiment, the power factor correction unit includes: a first switching transistor and a power factor correction circuit; the first switching transistor is electrically connected to a control module and electrically connected to the power factor correction circuit; the power factor correction circuit is connected between the bus and the power conversion module; the control module is configured to control the first switching transistor to turn on, so that the bus outputs voltage to the power conversion module via the power factor correction circuit; the control module is also configured to control the first switching transistor to turn off, so that the bus directly outputs voltage to the power conversion module.

[0010] In one alternative implementation, the control module is configured to output a low-level signal to control the first switch to turn off when the voltage of the load is less than a first voltage value; the control module is also configured to output a high-level signal to control the first switch to turn on when the voltage of the load exceeds the first voltage value.

[0011] In one optional embodiment, the feedback voltage regulation unit includes: a second switching transistor and a voltage reference chip; the second switching transistor is electrically connected to a control module, the voltage reference chip is electrically connected to the second switching transistor, and the voltage reference chip is electrically connected to the main circuit; the control module is configured to control the second switching transistor to turn on, so that the voltage reference chip outputs a high reference voltage to the main circuit; the control module is also configured to control the second switching transistor to turn off, so that the voltage reference chip outputs a low reference voltage to the main circuit.

[0012] In one optional implementation, the first switch and the second switch are connected to the same control port of the control module, so that the control module synchronously controls the first switch and the second switch to be turned on or off.

[0013] Secondly, embodiments of this disclosure also provide a wireless charging system, which includes: a power supply device and a wireless charger; wherein the power supply device is electrically connected to the wireless charger so that the power supply device outputs a corresponding voltage to the wireless charger under different operating conditions.

[0014] In one optional embodiment, the power supply device includes: a control module, a load voltage detection unit, a power factor correction unit, and a feedback voltage regulation unit; the load voltage detection unit, the power factor correction unit, and the feedback voltage regulation unit are electrically connected to the control module; the control module is configured to detect the voltage of the wireless charger through the load voltage detection unit; the control module is further configured to control the power factor correction unit to start or stop, and the feedback voltage regulation unit is configured to operate synchronously with the power factor correction unit to output a corresponding reference voltage signal to the main circuit.

[0015] In one optional embodiment, the load voltage detection unit includes: a plurality of sampling resistors; the power factor correction unit includes: a first switching transistor and a power factor correction circuit; each of the sampling resistors is electrically connected to the control module and each of the sampling resistors is electrically connected to the load; the first switching transistor is electrically connected to the control module and the power factor correction circuit; the power factor correction circuit is connected between the bus and the power conversion module; the control module is configured to detect the voltage of the wireless charger through each sampling resistor; the control module is further configured to output a high-level signal to control the first switching transistor to turn on when the voltage of the wireless charger exceeds a first voltage value, so that the bus outputs voltage to the power conversion module through the power factor correction circuit; the control module is configured to output a low-level signal to control the first switching transistor to turn off when the voltage of the wireless charger is less than the first voltage value, so that the bus directly outputs voltage to the power conversion module.

[0016] In one optional embodiment, the feedback voltage regulation unit includes: a second switching transistor and a voltage reference chip; the second switching transistor is electrically connected to a control module, the voltage reference chip is electrically connected to the second switching transistor, and the voltage reference chip is electrically connected to the main circuit; the control module is configured to control the second switching transistor to turn on, so that the voltage reference chip outputs a high reference voltage to the main circuit; the control module is also configured to control the second switching transistor to turn off, so that the voltage reference chip outputs a low reference voltage to the main circuit.

[0017] The beneficial effects of this utility model are that it detects the load voltage through the load voltage detection unit and simultaneously controls the operation of the power factor correction unit and the feedback voltage regulation unit. Specifically, it shuts down the power factor correction unit when the power is low, allowing the bus to be directly connected to the power conversion module, thus reducing the inherent losses in the power factor correction unit. At the same time, the feedback voltage regulation unit outputs a low reference voltage, which can reduce the voltage difference of the front-end drive. And when the power is high, it activates the power factor correction unit to improve the power factor of the input voltage. The feedback voltage regulation unit outputs a high reference voltage to meet the high-power drive requirements.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A circuit diagram of a power supply device based on dynamic power threshold control provided for embodiments of this disclosure;

[0022] Figure 2 A circuit diagram of a control module provided in an embodiment of this disclosure;

[0023] Figure 3 A circuit diagram of a connection node provided in an embodiment of this disclosure.

[0024] In the picture:

[0025] U2, control module; Q7, first switching transistor; Q6, second switching transistor; U10, voltage reference chip. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be restrictive. As used herein, the singular articles “a,” “one,” and “the” may also be intended to include plural forms unless otherwise clearly stated above.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] like Figures 1 to 3 As shown, at least one embodiment provides a power supply device based on dynamic control of power threshold, comprising: a control module U2, a load voltage detection unit, a power factor correction unit, and a feedback voltage regulation unit; the load voltage detection unit, the power factor correction unit, and the feedback voltage regulation unit are electrically connected to the control module U2; the control module U2 is configured to detect the voltage of the load through the load voltage detection unit; the control module U2 is further configured to control the power factor correction unit to start or stop, and the feedback voltage regulation unit is configured to operate synchronously with the power factor correction unit to output a corresponding reference voltage signal to the main circuit.

[0032] Specifically, the control module U2 can be a microcontroller, specifically the MSOP10 chip.

[0033] In at least one embodiment, the load voltage is detected by the load voltage detection unit, and the power factor correction unit and the feedback voltage regulation unit are controlled to operate synchronously. That is, the power factor correction unit is turned off when the power is low, so that the bus is directly connected to the power conversion module, reducing the inherent loss of the power factor correction unit. At the same time, the feedback voltage regulation unit outputs a low reference voltage to reduce the front-end drive voltage difference, and the power factor correction unit is activated when the power is high to improve the power factor of the input voltage. The feedback voltage regulation unit outputs a high reference voltage to meet the high power drive requirements.

[0034] In at least one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 The load voltage detection unit includes: a plurality of sampling resistors; each sampling resistor is electrically connected to the control module U2 and each sampling resistor is electrically connected to the load; the control module U2 is configured to detect the load voltage through each sampling resistor.

[0035] Specifically, the control module U2 acquires the load voltage V_LOAD through sampling resistors R46 and R47. When V_LOAD ≤ 12V (corresponding to output power ≤ 75W, assuming rated load resistance 1.92Ω, I = 12V / 1.92Ω = 6.25A, P = 75W), it is determined to be a low-power condition. At this time, the control module U2 outputs a low level to the power factor correction unit and the feedback voltage adjustment unit. When V_LOAD > 12V (power > 75W), the control module U2 outputs a high level to the power factor correction unit and the feedback voltage adjustment unit.

[0036] Specifically, the voltage divider nodes of sampling resistors R46 and R47 are connected to the analog input pin (AIN) of control module U2, and indirect power detection is achieved through V_LOAD=12V corresponding to the 75W power threshold.

[0037] Specifically, by using a 10KΩ sampling resistor R46 and a 3KΩ sampling resistor R47, the control module U2 detects a voltage of 2.769V (corresponding to a 3.3V ADC reference) when V_LOAD=12V. Combined with the rated load current of 6.25A, the 75W threshold is determined.

[0038] In at least one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 The power factor correction unit includes: a first switch Q7 and a power factor correction circuit; the first switch Q7 is electrically connected to the control module U2, and the first switch Q7 is electrically connected to the power factor correction circuit; the power factor correction circuit is connected between the bus and the power conversion module; the control module U2 is configured to control the first switch Q7 to be turned on, so that the bus outputs voltage to the power conversion module through the power factor correction circuit; the control module U2 is also configured to control the first switch Q7 to be turned off, so that the bus directly outputs voltage to the power conversion module.

[0039] Specifically, the first switching transistor Q7 is an N-channel MOSFET (such as IRF3205) with a withstand voltage of 55V, which meets the bus voltage requirements.

[0040] Specifically, outputting a low level to the control terminal of the first switching transistor Q7 can turn off the power factor correction circuit; outputting a high level to the control terminal of the first switching transistor Q7 can activate the power factor correction circuit.

[0041] Specifically, the gate of the first switching transistor Q7 is connected to the IO port of the control module U2 through resistor R16, and the source of the first switching transistor Q7 is grounded.

[0042] Specifically, in the power factor correction circuit, inductor L4 is connected in series between input rectifier bridge BD3, rectifier bridge BD4, bus capacitor CE7, and bus capacitor CE8.

[0043] In at least one embodiment, the control module U2 is configured to output a low-level signal to control the first switch Q7 to turn off when the voltage of the load is less than a first voltage value; the control module U2 is also configured to output a high-level signal to control the first switch Q7 to turn on when the voltage of the load exceeds the first voltage value.

[0044] In at least one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 The feedback voltage regulation unit includes a second switch Q6 and a voltage reference chip U10. The second switch Q6 is electrically connected to the control module U2, and the voltage reference chip U10 is electrically connected to the second switch Q6 and the total circuit. The control module U2 is configured to control the second switch Q6 to be turned on, so that the voltage reference chip U10 outputs a high reference voltage to the total circuit. The control module U2 is also configured to control the second switch Q6 to be turned off, so that the voltage reference chip U10 outputs a low reference voltage to the total circuit.

[0045] Specifically, the drain of the second switch Q6 is connected to the FB pin of the voltage reference chip U10 through resistor R74, the source of the second switch Q6 is grounded, and the gate of the second switch Q6 is connected to the same IO port as the control module U2 controlling the first switch Q7, so as to realize the linkage control of the power factor correction circuit shutdown and the feedback voltage downgrading.

[0046] Specifically, when the power factor correction circuit is turned off (the first switch Q7 is turned off), the second switch Q6 is turned off simultaneously, and the voltage reference chip U10 outputs a low feedback voltage of 15.7V; when the power factor correction circuit is activated (the first switch Q7 is turned on), the second switch Q6 is turned on simultaneously, and the voltage reference chip U10 outputs a high feedback voltage of 20.8V.

[0047] In at least one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 The first switch Q7 and the second switch Q6 are connected to the same control port of the control module U2 so that the control module U2 can synchronously control the first switch Q7 and the second switch Q6 to be turned on or off.

[0048] Specifically, both the first switch Q7 and the second switch Q6 are turned off, the power factor correction circuit stops working, and the bus voltage after input rectification is directly output through the power conversion module, avoiding the losses of inductor L4 and the first switch Q7; resistor R76 is connected to the feedback loop of voltage reference chip U10, and the voltage of FB pin is divided by resistors R49 and R76. Voltage reference chip U10 outputs a low reference voltage of 15.7V, reducing the voltage difference of the front-end drive.

[0049] Specifically, both the first switch Q7 and the second switch Q6 are turned on, the power factor correction circuit is activated, and the input power factor is improved; resistor R76 is short-circuited, the voltage of the FB pin is divided by resistor R49 alone, and the voltage reference chip U10 outputs a high reference voltage of 20.8V to meet the high power drive requirements.

[0050] Specifically, at low power, the power factor correction circuit is shut down, eliminating approximately 1.2W of inherent losses (measured data) in the power factor correction circuit. Combined with feedback voltage reduction, this improves efficiency from 88% to over 90% within 75W. At high power, the power factor correction circuit operates normally, ensuring power factor compliance (>0.95), achieving efficient operation under all conditions. The power factor correction circuit is only shut down when the output power is ≤75W, reducing its ineffective losses under low load, resulting in a measured efficiency improvement of >2%. The control module U2 controls the first switch Q7 and the second switch Q6 in a coordinated manner, simplifying circuit design and reducing costs. It is suitable for existing power supply architectures containing power factor correction circuits.

[0051] Based on the same technical concept, at least one embodiment also provides a wireless charging system, which includes: a power supply device and a wireless charger; wherein the power supply device is electrically connected to the wireless charger so that the power supply device outputs a corresponding voltage to the wireless charger under different operating conditions.

[0052] In at least one embodiment, the power supply device includes: a control module U2, a load voltage detection unit, a power factor correction unit, and a feedback voltage regulation unit; the load voltage detection unit, the power factor correction unit, and the feedback voltage regulation unit are electrically connected to the control module U2; the control module U2 is configured to detect the voltage of the wireless charger through the load voltage detection unit; the control module U2 is also configured to control the power factor correction unit to start or stop, and the feedback voltage regulation unit is configured to operate synchronously with the power factor correction unit to output a corresponding reference voltage signal to the main circuit.

[0053] In at least one embodiment, the load voltage detection unit includes: a plurality of sampling resistors; the power factor correction unit includes: a first switch Q7 and a power factor correction circuit; each of the sampling resistors is electrically connected to the control module U2, and each of the sampling resistors is electrically connected to the load; the first switch Q7 is electrically connected to the control module U2, and the first switch Q7 is electrically connected to the power factor correction circuit; the power factor correction circuit is connected between the bus and the power conversion module; the control module U2 is configured to detect the voltage of the wireless charger through each sampling resistor; the control module U2 is further configured to output a high-level signal to control the first switch Q7 to conduct when the voltage of the wireless charger exceeds a first voltage value, so that the bus outputs voltage to the power conversion module through the power factor correction circuit; the control module U2 is configured to output a low-level signal to control the first switch Q7 to turn off when the voltage of the wireless charger is less than the first voltage value, so that the bus directly outputs voltage to the power conversion module.

[0054] In at least one embodiment, the feedback voltage regulation unit includes: a second switch Q6 and a voltage reference chip U10; the second switch Q6 is electrically connected to a control module U2, the voltage reference chip U10 is electrically connected to the second switch Q6, and the voltage reference chip U10 is electrically connected to the main circuit; the control module U2 is configured to control the second switch Q6 to be turned on, so that the voltage reference chip U10 outputs a high reference voltage to the main circuit; the control module U2 is also configured to control the second switch Q6 to be turned off, so that the voltage reference chip U10 outputs a low reference voltage to the main circuit.

[0055] In summary, this invention detects the load voltage through a load voltage detection unit and simultaneously controls the operation of the power factor correction unit and the feedback voltage regulation unit. Specifically, at low power, the power factor correction unit is turned off, allowing the bus to be directly connected to the power conversion module, reducing the inherent losses in the power factor correction unit. At the same time, the feedback voltage regulation unit outputs a low reference voltage to reduce the voltage difference of the preceding drive stage. At high power, the power factor correction unit is activated to improve the power factor of the input voltage, and the feedback voltage regulation unit outputs a high reference voltage to meet the high power drive requirements. When the output power is ≤75W, the power factor correction circuit is automatically turned off to reduce redundant losses, resulting in an efficiency improvement of more than 2% for output power below 75W.

[0056] While this patent document contains numerous details, it should not be construed as limiting any utility model or the scope of the claims, but rather as a description of features of a particular embodiment of a particular utility model. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various functions described in the context of a single embodiment may also be implemented individually in multiple embodiments, or in any suitable sub-combination. Furthermore, although the foregoing features may be described as functioning in certain combinations, or even initially claimed to be so, in some cases one or more features from a combination of claims may be removed from the combination, and a combination of claims may refer to a sub-combination or a variation of a sub-combination.

[0057] Similarly, although the operations are described in a specific order in the accompanying drawings, this should not be construed as requiring the specific order or sequence shown to perform such operations, or all the described operations, in order to obtain the desired result. Furthermore, the separation of various system components in the embodiments of this patent document should not be construed as requiring such separation in all embodiments.

[0058] Only some implementations and examples are described; other implementations, enhancements, and variations can be made based on the content described and illustrated in this patent document.

[0059] When no intermediate component exists other than a line, trace, or other medium between the first and second components, the first component is directly coupled to the second component. When an intermediate component other than a line, trace, or other medium exists between the first and second components, the first component is indirectly coupled to the second component. The term "coupling" and its variations include direct coupling and indirect coupling. Unless otherwise stated, the term "about" is used to mean a range including upper and lower 10% of the value.

[0060] While several embodiments are provided in this disclosure, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit or scope of this disclosure. The present examples are intended to be illustrative rather than restrictive and are not limited to the details given. For example, various elements or components may be combined or integrated into another system, or certain features may be omitted or not implemented.

[0061] Furthermore, without departing from the scope of this disclosure, the discrete or individual technologies, systems, subsystems, and methods described and illustrated in the various embodiments may be combined or integrated with other systems, modules, technologies, or methods. Other items shown or discussed as coupled may be directly connected or indirectly coupled or communicated via some interface, device, or intermediate component in an electrical, mechanical, or other manner. Those skilled in the art can identify other examples of changes, substitutions, and modifications without departing from the spirit and scope of this disclosure.

Claims

1. A power supply device based on dynamic power threshold control, characterized in that, include: Control module (U2), load voltage detection unit, power factor correction unit, and feedback voltage regulation unit; The load voltage detection unit, power factor correction unit, and feedback voltage regulation unit are electrically connected to the control module (U2); The control module (U2) is configured to detect the voltage of the load via the load voltage detection unit; The control module (U2) is also configured to control the power factor correction unit to start or stop, and the feedback voltage adjustment unit is configured to operate synchronously with the power factor correction unit to output a corresponding reference voltage signal to the total circuit.

2. The power supply device as claimed in claim 1, characterized in that, The load voltage detection unit includes: a plurality of sampling resistors; Each of the sampling resistors is electrically connected to the control module (U2), and each of the sampling resistors is electrically connected to the load. The control module (U2) is configured to detect the voltage of the load through each sampling resistor.

3. The power supply device as claimed in claim 1, characterized in that, The power factor correction unit includes: a first switching transistor (Q7) and a power factor correction circuit; The first switch (Q7) is electrically connected to the control module (U2), and the first switch (Q7) is electrically connected to the power factor correction circuit; The power factor correction circuit is connected between the bus and the power conversion module; The control module (U2) is configured to control the first switching transistor (Q7) to turn on, so that the bus outputs voltage to the power conversion module via the power factor correction circuit; The control module (U2) is also configured to control the first switching transistor (Q7) to turn off so that the bus output voltage is directly supplied to the power conversion module.

4. The power supply device as claimed in claim 3, characterized in that, The control module (U2) is configured to output a low-level signal to control the first switching transistor (Q7) to turn off when the voltage of the load is less than a first voltage value; The control module (U2) is also configured to output a high-level signal to control the first switching transistor (Q7) to turn on when the voltage of the load exceeds a first voltage value.

5. The power supply device as described in claim 3, characterized in that, The feedback voltage regulation unit includes: a second switching transistor (Q6) and a voltage reference chip (U10). The second switch (Q6) is electrically connected to the control module (U2), the voltage reference chip (U10) is electrically connected to the second switch (Q6), and the voltage reference chip (U10) is electrically connected to the main circuit. The control module (U2) is configured to control the second switch (Q6) to turn on, so that the voltage reference chip (U10) outputs a high reference voltage to the total circuit; The control module (U2) is also configured to control the second switch (Q6) to turn off so that the voltage reference chip (U10) outputs a low reference voltage to the main circuit.

6. The power supply device as claimed in claim 5, characterized in that, The first switch (Q7) and the second switch (Q6) are connected to the same control port of the control module (U2) so that the control module (U2) can synchronously control the first switch (Q7) and the second switch (Q6) to be turned on or off.

7. A wireless charging system, characterized in that, include: The power supply device and wireless charger as described in any one of claims 1-6; in The power supply device is electrically connected to the wireless charger so that the power supply device outputs the corresponding voltage to the wireless charger under different operating conditions.

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