Circuitry with progressive overpower protection and wireless fast charger

Abstract

This utility model belongs to the field of power distribution technology, specifically relating to a circuit device with progressive overpower protection and a wireless fast charger. The circuit device includes: an input rectifier unit, a power conversion unit, a feedback control unit, an overpower protection trigger unit, and an output unit. The overpower protection trigger unit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold. The feedback control unit is also configured to output a corresponding control signal to the power conversion unit. By setting an overpower protection trigger unit between the feedback control unit and the output unit, this utility model can gradually reduce the output voltage and gradually increase the current when the output power of the output unit is abnormal, until the voltage drops below 3.3V to trigger the cut-off protection. This avoids the impact of direct power failure on the load, overcomes the problem of abnormal load operation and data loss caused by direct power failure, and achieves a smoother protection process.

Description

Technical Field

[0001] This utility model belongs to the field of power distribution technology, specifically relating to conversion devices, and more particularly to a circuit device with progressive overpower protection and a wireless fast charger. Background Technology

[0002] In existing power protection mechanisms, directly cutting off the power supply can cause load devices to malfunction or lose data due to a sudden voltage drop.

[0003] Therefore, there is an urgent need to develop a new circuit device and wireless fast charger with progressive overpower protection to solve the technical problem of abnormal load operation or data loss caused by directly cutting off the power supply in the power protection mechanism.

[0004] 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

[0005] This disclosure provides at least one circuit device with progressive overpower protection and a wireless fast charger.

[0006] In a first aspect, embodiments of this disclosure provide a circuit device with progressive overpower protection, comprising: an input rectifier unit, a power conversion unit, a feedback control unit, an overpower protection trigger unit, and an output unit; wherein the input rectifier unit, the power conversion unit, and the output unit are electrically connected in sequence, the feedback control unit is electrically connected to the power conversion unit, and the feedback control unit, the overpower protection trigger unit, and the output unit are electrically connected in sequence; the input rectifier unit and the power conversion unit are configured to rectify and change the power of the input voltage, respectively, and the output unit is configured to output voltage to a load; the feedback control unit is configured to detect the output voltage of the output unit through the overpower protection trigger unit; the overpower protection trigger unit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold; and the feedback control unit is further configured to output a corresponding control signal to the power conversion unit to adjust the output voltage of the output unit.

[0007] In one optional implementation, the input rectification unit includes a bridge rectifier circuit; the bridge rectifier circuit is connected to the voltage input terminal and the power conversion module to rectify the input voltage and output it to the power conversion module.

[0008] In one optional embodiment, the power conversion unit includes: a voltage regulation chip and a first switching transistor; the voltage regulation chip is electrically connected to the input rectification unit and the feedback control unit, and the voltage regulation chip is electrically connected to the output unit through the first switching transistor; the voltage regulation chip is configured to acquire a control signal sent by the feedback control unit; the voltage regulation chip is further configured to adjust the input voltage rectified by the input rectification unit and output it to the output unit through the first switching transistor.

[0009] In one optional embodiment, the feedback control unit includes: a feedback control chip; the feedback control chip is electrically connected to the power conversion unit and the over-power protection trigger unit; the feedback control chip is configured to detect the output voltage of the output unit through the over-power protection trigger unit; the feedback control chip is also configured to output a corresponding control signal to the power conversion unit.

[0010] In one optional embodiment, the overpower protection triggering unit includes: an overpower protection circuit and an output voltage detection circuit; the feedback control unit, the overpower protection circuit, the output voltage detection circuit, and the output unit are electrically connected in sequence; the feedback control unit is configured to detect the output voltage of the output unit through the output voltage detection circuit; the overpower protection circuit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold.

[0011] In one optional embodiment, the output voltage detection circuit includes: a plurality of voltage divider detection resistors; each of the voltage divider detection resistors is electrically connected to an output unit, and each of the voltage divider detection resistors is electrically connected to a feedback control unit through a voltage divider node; the feedback control unit is configured to detect the output voltage of the output unit through each voltage divider detection resistor.

[0012] In one optional embodiment, the output voltage detection circuit includes: a Zener diode; the Zener diode is electrically connected to a voltage divider node and electrically connected to a feedback control unit; the Zener diode is configured to output an overpower protection signal to the feedback control unit when it is turned on.

[0013] In one optional embodiment, the output unit includes: a voltage output chip and a plurality of output units; the voltage output chip is electrically connected to the power conversion unit, and each of the output units is electrically connected to the voltage output chip; the voltage output chip is configured to output voltage to the corresponding load through each output unit.

[0014] In one optional embodiment, the output unit includes: an output interface; the output interface is electrically connected to a voltage output chip, and each of the output interfaces is adapted to connect to a load.

[0015] Secondly, embodiments of this disclosure also provide a wireless fast charger, which includes: a circuit device as described above with progressive overpower protection.

[0016] The beneficial effect of this utility model is that by setting an overpower protection trigger unit between the feedback control unit and the output unit, the output voltage can gradually decrease and the current can gradually increase when the output power of the output unit is abnormal, until the voltage is lower than 3.3V to trigger the cut-off protection, avoiding the impact of direct power failure on the load, overcoming the problem of abnormal load operation and data loss caused by direct power failure, and achieving a more stable protection process.

[0017] 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.

[0018] 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

[0019] 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.

[0020] Figure 1 A circuit diagram of a circuit device with progressive overpower protection provided for embodiments of this disclosure;

[0021] Figure 2 A circuit diagram of an output unit provided in an embodiment of this disclosure;

[0022] Figure 3 A circuit diagram for load current sampling provided in this disclosure embodiment;

[0023] Figure 4 A circuit diagram of an output interface provided in an embodiment of this disclosure.

[0024] In the picture:

[0025] BD1, Bridge rectifier circuit; U3, Voltage regulator chip; Q1, First switching transistor; U1, Feedback control chip; D2, Zener diode; GO, Voltage divider node; U4, Voltage output 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] Research has found that existing power protection mechanisms employ overload protection (OLP) and overcurrent protection (OCP). However, both OLP and OCP directly cut off the power supply, which can cause load devices to malfunction or lose data due to sudden voltage drops.

[0030] Based on the above research, this disclosure provides a circuit device and a wireless fast charger with progressive overpower protection, which can gradually reduce the output voltage and gradually increase the current when the power is abnormal, until the voltage drops below 3.3V and the protection is triggered, thus avoiding the drawbacks of traditional protection mechanisms.

[0031] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure below should be considered as contributions made by the utility model inventor to this disclosure.

[0032] 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.

[0033] 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.

[0034] like Figures 1 to 4 As shown, at least one embodiment provides a circuit device with progressive overpower protection, comprising: an input rectifier unit, a power conversion unit, a feedback control unit, an overpower protection trigger unit, and an output unit; wherein the input rectifier unit, the power conversion unit, and the output unit are electrically connected in sequence, the feedback control unit is electrically connected to the power conversion unit, and the feedback control unit, the overpower protection trigger unit, and the output unit are electrically connected in sequence; the input rectifier unit and the power conversion unit are configured to rectify and change the power of the input voltage, respectively, and the output unit is configured to output voltage to a load; the feedback control unit is configured to detect the output voltage of the output unit through the overpower protection trigger unit; the overpower protection trigger unit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold; and the feedback control unit is further configured to output a corresponding control signal to the power conversion unit to adjust the output voltage of the output unit.

[0035] In at least one embodiment, by setting an overpower protection trigger unit between the feedback control unit and the output unit, the output voltage can be gradually reduced and the current can be gradually increased when the output power of the output unit is abnormal, until the voltage is lower than 3.3V to trigger the cut-off protection, avoiding the impact of direct power failure on the load, overcoming the problem of abnormal load operation and data loss caused by direct power failure, and achieving a more stable protection process.

[0036] In at least one embodiment, please refer to Figure 1 The input rectification unit includes a bridge rectifier circuit BD1; the bridge rectifier circuit BD1 is connected to the voltage input terminal and the power conversion module to rectify the input voltage and output it to the power conversion module.

[0037] Specifically, the function of the bridge rectifier circuit BD1 is to convert alternating current into direct current.

[0038] In at least one embodiment, please refer to Figure 1The power conversion unit includes a voltage regulation chip U3 and a first switching transistor Q1. The voltage regulation chip U3 is electrically connected to the input rectification unit and the feedback control unit, and the voltage regulation chip U3 is electrically connected to the output unit through the first switching transistor Q1. The voltage regulation chip U3 is configured to acquire the control signal sent by the feedback control unit. The voltage regulation chip U3 is also configured to adjust the input voltage after rectification by the input rectification unit and output it to the output unit through the first switching transistor Q1.

[0039] Specifically, the power conversion unit also includes: inductor L1, rectifier diode D1, filter capacitor C5 and filter capacitor C8.

[0040] Specifically, the voltage regulation chip U3, in conjunction with the first switching transistor Q1, can regulate the voltage for output.

[0041] Specifically, the voltage regulator chip U3 uses the OB2004 chip, which can be used for secondary-side rectification of switching power supply systems. That is, it drives an N-channel MOSFET (first switching transistor Q1) with a much lower voltage drop to simulate the traditional diode rectifier on the secondary side of a flyback converter, thereby reducing heat dissipation, improving output current capability and efficiency, and simplifying heat dissipation design. It can support a wide range of system output voltages from 5V to 12V.

[0042] In at least one embodiment, please refer to Figure 1 The feedback control unit includes a feedback control chip U1; the feedback control chip U1 is electrically connected to the power conversion unit and the over-power protection trigger unit; the feedback control chip U1 is configured to detect the output voltage of the output unit through the over-power protection trigger unit; the feedback control chip U1 is also configured to output a corresponding control signal to the power conversion unit.

[0043] Specifically, the feedback control chip U1 uses the OB2633 chip, which is a high-efficiency multi-mode PWM controller to realize PWM signal output.

[0044] In at least one embodiment, please refer to Figure 1 , Figure 2 The overpower protection trigger unit includes an overpower protection circuit and an output voltage detection circuit; the feedback control unit, the overpower protection circuit, the output voltage detection circuit, and the output unit are electrically connected in sequence; the feedback control unit is configured to detect the output voltage of the output unit through the output voltage detection circuit; the overpower protection circuit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold.

[0045] Specifically, the output voltage detection circuit is used to accurately feed back the output voltage of the output unit, which ensures that the feedback control unit can provide feedback regulation to the power conversion unit.

[0046] Specifically, the overpower protection circuit intervenes when the output power of the output unit is abnormal, thereby realizing a gradual protection process and avoiding direct power failure that could impact the load.

[0047] In at least one embodiment, please refer to Figure 2 The output voltage detection circuit includes: a plurality of voltage divider detection resistors; each voltage divider detection resistor is electrically connected to the output unit, and each voltage divider detection resistor is electrically connected to the feedback control unit through a voltage divider node GO; the feedback control unit is configured to detect the output voltage of the output unit through each voltage divider detection resistor.

[0048] Specifically, voltage divider detection resistors R25 and R26 are connected in series between the output positive terminal (OUT+) and ground (GND), and the voltage divider node GO is connected to the FB pin of the feedback control chip U1 through voltage divider detection resistor R29.

[0049] In at least one embodiment, please refer to Figure 1 The output voltage detection circuit includes: a Zener diode D2; the Zener diode D2 is electrically connected to the voltage divider node GO, and the Zener diode D2 is electrically connected to the feedback control unit; the Zener diode D2 is configured to output an overpower protection signal to the feedback control unit when it is turned on.

[0050] Specifically, the Zener diode D2 is an SOD-323 type diode, with its anode connected between the output voltage detection circuit and the FB pin of the feedback control chip U1, and its cathode connected to the gate drive circuit of the first switching transistor Q1 or ground potential.

[0051] Specifically, the Zener diode D2 is connected in parallel across the voltage divider detection resistor R29 or in series in the feedback path to conduct during overpower events and reduce the feedback voltage.

[0052] Specifically, during normal operation, the Zener diode D2 is turned off due to reverse bias (zener voltage 5.1V). The feedback loop accurately acquires the output voltage through the voltage divider detection resistors R25, R26, and R29. The feedback control chip U1 controls the first switching transistor Q1 to maintain a stable output.

[0053] Specifically, during overpower detection, when the output power exceeds the threshold (P=V×I), the output current I rises, causing the voltage drop of the detection resistors R7 and R8 to increase. At the same time, the output voltage V decreases slightly due to the increased load. When the power product exceeds the set value, the voltage of the Zener laser anode drops below 5.1V, and the Zener diode D2 turns on.

[0054] Specifically, during over-power protection, after the Zener diode D2 turns on, please refer to [the relevant documentation / reference]. Figure 3 Optocoupler U2 is directly connected to the positive output terminal (OUT+) to shunt the feedback loop current, thereby reducing the voltage at the FB pin of feedback control chip U1. This reduces the duty cycle of the output drive signal of feedback control chip U1, shortens the conduction time of the first switch Q1, and causes the output voltage V to gradually decrease. Since the load impedance remains constant, the current I gradually increases as V decreases (I=V / R load). When the output voltage V < 3.3V, the internal protection circuit of feedback control chip U1 is activated, cutting off the drive signal of the first switch Q1 to achieve final protection and avoid direct power failure impact.

[0055] Specifically, unlike the sudden power cut-off of overload protection and overcurrent protection, the voltage gradually decreases and the current gradually increases through the Zener diode D2, making the protection process smoother. By utilizing the Zener diode D2's voltage regulation characteristics (5.1V) and the voltage divider resistor network, the overpower protection trigger point (final protection when V < 3.3V) can be accurately set. Only the Zener diode D2 and the voltage divider detection resistor need to be added to the existing feedback loop, without major circuit modifications, making it low-cost and easy to implement.

[0056] In at least one embodiment, please refer to Figure 2 The output unit includes a voltage output chip U4 and several output units; the voltage output chip U4 is electrically connected to the power conversion unit, and each of the output units is electrically connected to the voltage output chip U4; the voltage output chip U4 is configured to output voltage to the corresponding load through each output unit.

[0057] Specifically, the voltage output chip U4 can achieve wired charging and wireless charging through the output unit.

[0058] In at least one embodiment, please refer to Figure 4 The output unit includes an output interface; the output interface is electrically connected to the voltage output chip U4, and each of the output interfaces is adapted to connect to a load.

[0059] Specifically, the output interfaces USB1 and USB2 can be connected to corresponding chargers, which can be wired chargers or wireless chargers.

[0060] Based on the same technical concept, at least one embodiment also provides a wireless fast charger, which includes: a circuit device with progressive overpower protection as described above.

[0061] In summary, this utility model, by setting an overpower protection trigger unit between the feedback control unit and the output unit, can gradually reduce the output voltage and gradually increase the current when the output power of the output unit is abnormal, until the voltage drops below 3.3V to trigger the cut-off protection, thus avoiding the impact of direct power failure on the load, overcoming the problem of abnormal load operation and data loss caused by direct power failure, and achieving a more stable protection process.

[0062] The processing and logic flows described in this document can be executed by one or more programmable processors that execute one or more computer programs to perform functions by manipulating input data and generating outputs. The processing and logic flows can also be executed by special-purpose logic circuitry, and the devices can be implemented as special-purpose logic circuitry, such as FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In the several embodiments provided herein, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0069] 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 circuit device with progressive overpower protection, characterized in that, include: Input rectification unit, power conversion unit, feedback control unit, over-power protection trigger unit, and output unit; in The input rectifier unit, power conversion unit, and output unit are electrically connected in sequence. The feedback control unit is electrically connected to the power conversion unit. The feedback control unit, overpower protection trigger unit, and output unit are electrically connected in sequence. The input rectifier unit and the power conversion unit are configured to rectify the input voltage and convert the power, respectively, and the output unit is configured to output voltage to the load. The feedback control unit is configured to detect the output voltage of the output unit via an overpower protection trigger unit; The overpower protection triggering unit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold; and The feedback control unit is also configured to output a corresponding control signal to the power conversion unit to adjust the output voltage of the output unit.

2. The circuit device with progressive overpower protection as described in claim 1, characterized in that, The input rectifier unit includes: a bridge rectifier circuit (BD1); The bridge rectifier circuit (BD1) connects the voltage input terminal to the power conversion module to rectify the input voltage and output it to the power conversion module.

3. The circuit device with progressive overpower protection as described in claim 1, characterized in that, The power conversion unit includes a voltage regulation chip (U3) and a first switching transistor (Q1). The voltage regulation chip (U3) is electrically connected to the input rectifier unit and the feedback control unit, and the voltage regulation chip (U3) is electrically connected to the output unit through the first switching transistor (Q1); The voltage regulation chip (U3) is configured to acquire control signals sent by the feedback control unit; The voltage regulation chip (U3) is also configured to adjust the input voltage after rectification by the input rectifier unit and output it to the output unit via the first switch (Q1).

4. The circuit device with progressive overpower protection as described in claim 1, characterized in that, The feedback control unit includes: a feedback control chip (U1). The feedback control chip (U1) is electrically connected to the power conversion unit and the overpower protection trigger unit; The feedback control chip (U1) is configured to detect the output voltage of the output unit through the over-power protection trigger unit; The feedback control chip (U1) is also configured to output corresponding control signals to the power conversion unit.

5. The circuit device with progressive overpower protection as described in claim 1, characterized in that, The overpower protection triggering unit includes: an overpower protection circuit and an output voltage detection circuit; The feedback control unit, overpower protection circuit, output voltage detection circuit, and output unit are connected in sequence. The feedback control unit is configured to detect the output voltage of the output unit via an output voltage detection circuit; The overpower protection circuit is configured to output an overpower protection signal to the feedback control unit when the output power of the output unit exceeds a threshold.

6. The circuit device with progressive overpower protection as described in claim 5, characterized in that, The output voltage detection circuit includes: a plurality of voltage divider detection resistors; Each of the voltage divider detection resistors is electrically connected to the output unit, and each of the voltage divider detection resistors is electrically connected to the feedback control unit through the voltage divider node (GO); The feedback control unit is configured to detect the output voltage of the output unit through each voltage divider detection resistor.

7. The circuit device with progressive overpower protection as described in claim 6, characterized in that, The output voltage detection circuit includes: a Zener diode (D2); The Zener diode (D2) is electrically connected to the voltage divider node (GO), and the Zener diode (D2) is also electrically connected to the feedback control unit; The Zener diode (D2) is configured to output an overpower protection signal to the feedback control unit when it is turned on.

8. The circuit device with progressive overpower protection as described in claim 1, characterized in that, The output unit includes: a voltage output chip (U4) and several output units; The voltage output chip (U4) is electrically connected to the power conversion unit, and each of the output units is electrically connected to the voltage output chip (U4). The voltage output chip (U4) is configured to output voltage to the corresponding load through each output unit.

9. The circuit device with progressive overpower protection as described in claim 8, characterized in that, The output unit includes: an output interface; The output interface is electrically connected to the voltage output chip (U4), and each of the output interfaces is suitable for connecting a load.

10. A wireless fast charger, characterized in that, include: The circuit device with progressive overpower protection as described in any one of claims 1-9.

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