KR101503220B1 - Load-sensing adaptive type dongle wireless charging receiver - Google Patents

Abstract

Disclosed is a load-sensing adaptive dongle wireless charging receiver capable of preventing electrical damage to a charging load. The load-sensing adaptive dongle wireless charging receiver comprises: a matching circuit unit for performing impedance matching by receiving wireless power from a resonant wireless power transmitter; a rectifier circuit unit for rectifying the wireless power received from the resonant wireless power transmitter; a charging current protection circuit unit for outputting the wireless power rectified by the rectifier circuit unit by limiting the maximum current of the wireless power; a charging current variable resistor unit for variably adjusting the maximum voltage and the maximum current of the charging current protection circuit unit by using a variable resistance; a charging voltage/current sensing unit for sensing the voltage and current of charging power, which is output from the charging current protection circuit unit and inputted to a charging load, and feeding back the sensed voltage and current of the charging power; and a control circuit unit for controlling the charging current variable resistor unit to limit the maximum voltage and the maximum current of the charging current protection circuit unit to 15 to 25% greater than the voltage and current of the charging power fed back from the charging voltage/current sensing unit and feeding back set values, which correspond to the voltage and current of the charging power fed back from the charging voltage/current sensing unit, and requirements to the resonant wireless power transmitter through bluetooth of low energy (BLE) communications.

Description

[0001] LOAD-SENSING ADAPTIVE TYPE DONGLE WIRELESS CHARGING RECEIVER [0002]

The present invention relates to a charging receiver, and more particularly, to a wireless charging receiver. More particularly, the present invention relates to a charging recharger, which detects a charging current according to a type of a load and supplies an optimal charging current, The present invention relates to a load sensing adaptive dongle wireless charging receiver configured for wired communication.

The resonant type wireless charging system consists of a wireless power transmitter and a wireless power receiver, and the transmission and reception of power is performed wirelessly mainly through the resonance frequency between the wireless power transmitter and the wireless power receiver.

Japanese Patent Application Laid-Open No. 10-1253669 discloses a system for transmitting and receiving wireless power based on a typical resonant frequency. In the case of the patent publication 2002-0083332, a wireless power transmission / reception system is also disclosed.

Since wireless charging does not require a wired cable, its utilization is increasing. However, since the charge load varies from smartphone, tablet PC, and notebook computer, wireless charging system is also variously based on charging load.

This is because the connection between the charging load and the wireless recharging receiver depends on the charging load, and the proper charging current of the charging load also differs depending on the type of the charging load.

For example, in smart phones, charging current varies from 1 A to 1.7 A, depending on the type of smartphone. Among other types of devices, the charging current of a notebook computer is more than 2 A, and the charging current is very high. And a very small charge current of less than 50 mA is required for a relatively small wearable device.

Therefore, manufacturing the wireless charging system differently depending on the charging load is also burdensome for the manufacturer, and purchasing the wireless charging system according to the charging load may also be inconvenient and burdensome for the purchaser.

Because of this, compatibility between the wireless charging system and the charging load is required, and a universal wireless charging system capable of appropriately adjusting the charging current for each charging load is required.

A wireless charging system for notebooks that can be charged with a high current can cause serious damage to the wearable device due to overcurrent and overvoltage when wirelessly charging the wearable device.

There is a need for a solution that can solve these problems and safely charge them.

10-1253669 ▒ 2002-0083332

It is an object of the present invention to provide a load sensing adaptive dongle wireless charging receiver.

According to an aspect of the present invention, there is provided a load sensing adaptive dongle wireless charging receiver including: a matching circuit for receiving impedance power and receiving impedance power from a resonant wireless power transmitter; A rectifier circuit for rectifying the radio power received from the resonant radio power transmitter; A charge current protection circuit for limiting and outputting a maximum current of the rectified rectified rectified rectified rectified current; A charge current variable resistor part for variably adjusting a maximum voltage and a maximum current of the charge current protection circuit part using a variable resistor; A charge voltage / current sensing unit for sensing the voltage and current of the charge power outputted from the charge current protection circuit unit and input to the charge load and for feedbacking the voltage and current of the charge power sensed; Controls the charging current variable resistor unit to limit the maximum voltage and the maximum current of the charging current protection circuit unit by 15% to 25% higher than the voltage and current of the charging power fed back from the charging voltage / current sensing unit, And a control circuit for feeding back the set value and the requirement corresponding to the voltage and current of the charge power fed back from the current sensing unit to the resonant wireless power transmitter through Bluetooth of Low Energy (BLE) communication.

Here, the load sensing adaptive dongle wireless recharging receiver may be configured to be connected to the charging load through a universal serial bus connector or an adapter connector.

And a USB switch circuit portion having a switch for USB connection of the charging load to a computer.

At this time, when the USB cable of the computer is connected to the USB switch circuit unit, the control circuit unit switches the D + / D- USB connection of the charging load so that the charging load can perform USB data communication with the computer . ≪ / RTI >

According to the above-described load sensing adaptive dongle wireless charging receiver, since the USB connector or the adapter connector is connected to the charging load in the dongle type wireless charging receiver, the connection can be made regardless of the type of the charging load .

At this time, the dongle wireless charging receiver is provided with the USB switch circuit portion, so that the charging load through the D + / D- terminal and the data communication with the other device are enabled, so that charging and data communication can be maintained at the same time.

On the other hand, by preventing the damage of the charging load by appropriately restricting the maximum current of the initially received radio power, detecting the charging current and feeding back to the wireless charging transmitter, the wireless power can be received with the charging current most suitable for the charging load There is an effect. Thus, it is possible to maintain the optimum charging efficiency and to prevent electrical damage of the charging load.

It also has the effect of reducing power consumption.

In particular, during the constant current mode power supply during charging, when the problem progresses to CV (constant voltage) after dqjtdmsk, the load power of the load sensing adaptive dongle wireless charging receiver is maintained constantly, The power efficiency is deteriorated because the amount of power is reduced. In the present invention, since the charging current is constantly sensed and fed back, the power charging efficiency can be maintained high.

This prevents heat generation of the load sensing adaptive dongle wireless charging receiver 100 and accumulation of circuit damage and increases power efficiency.

Also, there is an effect that the charging can be performed optimally regardless of the type of charging load, and all types of charging loads can be wirelessly charged with one wireless charging receiver without having to provide a wireless charging receiver for each charging load.

1 is a block diagram of a load sensing adaptive dongle wireless charging receiver according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a load sensing adaptive dongle wireless charging receiver according to an embodiment of the present invention.

1, a load sensing adaptive dongle wireless charging receiver 100 according to an embodiment of the present invention includes a matching circuit 110, a rectifying circuit 120, a charging current protection circuit 130, A charge voltage / current sensing unit 150, a control circuit unit 160, and a universal serial bus switch circuit unit 170. The charge /

The load sensing adaptive dongle wireless recharging receiver 100 is connected to a smart phone, a notebook computer, a wearable device, etc. via a universal serial bus connector or an adapter connector Can be configured to be connected. Thus, the connection can be made irrespective of the type of the charging load 20.

The load sensing adaptive dongle wireless charging receiver 100 may also be configured to sense the charging current of the charging load 20 in real time and feed back to the resonant wireless power transmitter 10. The resonant wireless power transmitter 30 may be configured to transmit and change the wireless power corresponding to the feedback charging current.

Accordingly, the load sensing adaptive dongle wireless charging receiver 100 can be prevented from being damaged due to excessive charging of the charging load 20 by the wireless power, and the optimal charging efficiency can be maintained.

In addition, charging can be performed irrespective of the type of the charging load 20 by using such a load sensing adaptive feedback technique.

It is also possible to connect the charging load 20 and other devices such as the computer 30 at the same time to switch the charging load 20 to the USB connection and to maintain data communication via the D + / D- terminal connection while maintaining the charging connection. Lt; / RTI >

Particularly, there is no problem in power transmission in the constant current mode during charging. However, when the load sensing adaptive dongle wireless charging receiver 100 proceeds to CV (constant voltage) thereafter, the wireless power received by the load sensing adaptive dongle wireless charging receiver 100 is continuously maintained, Since the amount of power to be charged into the battery 20 is reduced, the power efficiency is deteriorated. In the present invention, the charging current is continuously sensed and fed back, so that the power charging efficiency is maintained high.

This prevents heat generation of the load sensing adaptive dongle wireless charging receiver 100 and accumulation of circuit damage, so that there is no heat generation and accordingly power efficiency is increased.

Hereinafter, the detailed configuration will be described.

The matching circuitry 110 may be configured to receive wireless power from the resonant wireless power transmitter 10 to perform impedance matching.

The matching circuitry 110 may be configured to optimize the transmission efficiency of the wireless power through impedance matching.

The rectifying circuit section 120 may be configured to rectify the radio power received from the resonant radio power transmitter 10. [ AC power is transmitted and can be configured to rectify it and convert it into a form of chargeable power.

The charging current protection circuit unit 130 may be configured to limit and output the maximum current of the rectified rectified current by the rectifying circuit unit 120.

The load sensing adaptive dongle wireless charging receiver 100 itself may malfunction due to high power during instantaneous transmission of wireless power, in which case the load sensing adaptive dongle wireless charging receiver 100, as well as the charging load 20, It is necessary to protect it.

Meanwhile, the charge current protection circuit unit 130 may be configured to be connected to the charge load 20 through a universal serial bus connector or an adapter connector.

The load sensing adaptive dongle wireless charging receiver 100 can prevent heat generation and damage due to excessive radio transmission power of the resonant wireless power transmitter 10 during constant voltage charging.

The charging current variable resistor unit 140 may be configured to variably adjust the maximum voltage and the maximum current of the charging current protection circuit unit 130 using a variable resistor. This is a configuration for restricting the maximum allowable voltage and the maximum allowable current to protect the circuit when the wireless received power is particularly momentarily overloaded at the initial time.

A variable resistor is selected by the control of the control circuit unit 160 so that the maximum voltage and the maximum current can be adjusted.

The charging voltage / current sensing unit 150 may be configured to sense the voltage and current of the charging power output from the charging current protection circuit unit 140 and input to the charging load 20. [

At this time, the charging voltage / current sensing unit 150 may be configured to feedback the voltage and current of the sensed charging power to the control circuit unit 160.

The control circuit unit 160 controls the charging current control unit 130 so as to limit the maximum voltage and the maximum current of the charging current protection circuit unit 15 by 15% to 25% higher than the voltage and current of the charging power fed back from the charging voltage / And controlling the resistor unit 150. [

Preferably, the control circuit 160 may control the charging current variable resistor unit 150 to limit the maximum voltage and the maximum current by 20% higher than the voltage and current of the fed-back charging power.

For example, a limiter circuit may be configured to have a current limit of 1.2 A if a 1 A charge current is detected, or a limit of 2.4 A if a 2 A charge current is detected to provide a load sense adaptive dongle wireless charge receiver 100 ) And the charging load (20).

The type of the charging load 20 is actually confirmed by the detection of the charging voltage / current sensing unit 150, and the control circuit unit 160 functions to change and control the optimum charging current.

The control circuit 160 receives the set values and requirements corresponding to the voltage and current of the charging power fed back from the charging voltage / current sensing unit 150 through the resonance type wireless power transmitter 10 (Bluetooth of Low Energy) ). ≪ / RTI > Through feedback via the BLE communication, the resonant wireless power transmitter 10 may be configured to send the voltage and current of the charge transmit power in a manner that is either lowered or raised to meet the feedback setpoint and requirements.

The USB switch circuitry 170 may be configured to include a switch for USB connection of the charging load 20 to another device, such as a computer.

The USB switch circuit unit 170 is a configuration for allowing the charging load 20 to perform data communication even when wireless power is being charged. The USB switch circuit unit 170 is USB-connected to the charging load 20 and is also connected to the computer 30 via USB.

The control circuit 160 switches the USB connection terminal of the charging load 20 to D + / D- when the charging load 20 is connected to the USB switch circuit unit 170, And to enable USB data communication with the external device 30. Conversely, if you talk, you maintain a charge connection even during data communication.

Generally, when a USB cable is connected to an electronic device for data communication, it supports not only data communication but also charging of electronic devices. At this time, the charging current is limited. This affects the charging time of the electronic device. According to the present invention, in the case of USB charging through the load sensing adaptive dongle wireless charging receiver 100, not only data communication but also a charging current is set without regard to whether or not the USB connection is made so that there is no problem in charging.

 When the USB connection is detected during wireless charging, the USB data connection terminal D + / D- is connected to the connected USB cable to enable data communication, and the charging current connection is established through the connection of the load sensing adaptive dongle wireless charging receiver 100 It can be solved by maintaining the connection with the electric power and delivering sufficient current to the connected electronic device. However, the connection in the state in which wireless charging is not performed causes the USB operation to be performed for each electronic device.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

10: Resonant wireless power transmitter 20: Charging load
30: computer 110: matching circuit
120: rectification circuit part 130: charge current protection circuit part
140: Charge current variable resistor unit 150: Charge voltage / current sensing unit
160: control circuit section 170: USB switch circuit section

Claims (4)

A matching circuit part (110) for receiving wireless power from the resonant wireless power transmitter (10) and performing impedance matching;
A rectifying circuit part (120) for rectifying the radio power received from the resonant type wireless power transmitter (10);
A charge current protection circuit unit 130 for limiting and outputting a maximum current of the rectified radio power in the rectifier circuit unit 120;
A charge current variable resistance unit 140 for variably adjusting a maximum voltage and a maximum current of the charge current protection circuit unit 130 using a variable resistor;
A charging voltage / current sensing unit 150 for sensing the voltage and current of the charging power outputted from the charging current protection circuit unit 130 and inputting the charging load, and for feedbacking the voltage and current of the sensed charging power;
The charging current control unit 130 may control the charge current control unit 130 to limit the maximum voltage and the maximum current of the charge current protection circuit unit 130 by 15% to 25% higher than the voltage and current of the charge power fed back from the charge voltage / 140 and controls the setting values and requirements corresponding to the voltage and current of the charging power fed back from the charging voltage / current sensing unit 150 to the resonance type wireless power transmitter (BLE) And a control circuit unit (160) for feeding back the feedback signal to the control unit (10). 2. The load sensing adaptive dongle wireless charging receiver (100) of claim 1, wherein the load sensing adaptive dongle wireless charging receiver (100)
Is configured to be coupled to the charging load (20) via a universal serial bus connector or an adapter connector.
The method according to claim 1,
Further comprising a USB switch circuitry (170) having a switch for USB connection of the charging load (20) to a computer (30).
4. The apparatus of claim 3, wherein the control circuit unit (160)
When the USB cable of the computer 30 is connected to the USB switch circuit unit 170, the D + / D- USB connection of the charging load 20 is switched so that the charging load 20 is connected to the computer 30 Wherein the control unit controls the wireless communication unit to perform data communication.

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