KR-102961819-B1 - Wireless power transmitting device and electronic device including the same

KR102961819B1KR 102961819 B1KR102961819 B1KR 102961819B1KR-102961819-B1

Abstract

An electronic device according to various embodiments of the present disclosure may include a processor; a battery; and a wireless power transmitter, wherein the wireless power transmitter includes a switch circuit, a filter circuit, and a series resonant circuit; a power amplifier circuit that converts direct current power received from the battery or DC adapter into alternating current and implements zero voltage switching (ZVS); a power transmitter circuit that includes a power transmitter coil that transmits power received from the power amplifier circuit to the outside; a matching circuit connected between the power amplifier circuit and the power transmitter circuit and matching the impedances of the power amplifier circuit and the power transmitter circuit; and a negative voltage detection circuit connected to the filter circuit of the power amplifier circuit and detecting a negative voltage generated in the filter circuit, wherein the negative voltage detection circuit includes a positive voltage supply power source and a plurality of resistors, and may include a voltage divider circuit that converts the negative voltage generated in the filter circuit of the power amplifier circuit into a positive voltage within a predetermined range; a voltage sensor that detects the converted positive voltage; and a low-pass filter connected between the voltage divider circuit and the voltage sensor.

Inventors

구범우
박재석
박재현
신재선
여성구

Assignees

삼성전자 주식회사

Dates

Publication Date: 20260507
Application Date: 20220228
Priority Date: 20211230

Claims (20)

In electronic devices, processor; Battery; and It includes a wireless power transmitter, The above wireless power transmitter A power amplifier circuit comprising a switch circuit, a filter circuit, and a series resonant circuit, which converts direct current power received from the battery or DC adapter into alternating current and implements zero voltage switching (ZVS); A power transmission circuit including a power transmission coil that transmits power received from the power amplifier circuit to the outside; A matching circuit connected between the power amplifier circuit and the power transmission circuit, and matching the impedances of the power amplifier circuit and the power transmission circuit; and It includes a negative voltage detection circuit connected to the filter circuit of the power amplifier circuit and detecting a negative voltage generated in the filter circuit, The above negative voltage detection circuit is A voltage divider circuit comprising a positive voltage supply and a plurality of resistors, which converts a negative voltage generated in the filter circuit of the power amplifier circuit into a positive voltage within a predetermined range; A voltage sensor for detecting the above-mentioned converted positive voltage; and An electronic device comprising a low-pass filter connected between the voltage divider circuit and the voltage sensor.
In Article 1, The above switch circuit is A first coil connected between a first node and a second node, which blocks an alternating current signal that can flow to the battery; A transistor connected between the second node and ground, which is turned on or off according to an electrical signal and acts as a switch for implementing soft switching using a zero-voltage switching (ZVS) method; A driver connected to the above transistor and generating a driver signal to drive the above transistor; and An electronic device comprising a first capacitor connected between the second node and ground.
In Paragraph 2, The above series resonant circuit is A second coil connected between the second node and the fourth node; and It includes a second capacitor connected between the fourth node and the fifth node; and The above filter circuit is A third coil connected between the second node and the third node; and An electronic device comprising a third capacitor connected between the third node and ground.
In Paragraph 3, The above matching circuit is A fourth coil connected between the above-mentioned fifth and sixth nodes; A fourth capacitor connected between the sixth node and ground; and It includes a fifth capacitor connected between the sixth node and the seventh node; and The power transmission coil of the above power transmission circuit is An electronic device connected between the 7th and 8th nodes.
In Paragraph 3, The above negative voltage detection circuit is It is connected to the third node of the filter circuit above, and The above voltage divider circuit is A first resistor connected between the third node and the ninth node and An electronic device comprising a diode in which the negative electrode is connected toward the 9th node and the positive electrode is connected toward the 10th node.
In Paragraph 5, The above voltage divider circuit is The sensing circuit capacitor connected between the above 10th node and ground A second resistor connected between the above 10th node and ground; A third resistor connected between the above positive voltage supply and the 11th node; and An electronic device comprising a fourth resistor connected between the 10th node and the 11th node.
In Paragraph 6, The above low-pass filter is A filter resistor connected between the above 11th node and 12th node and An electronic device including a filter capacitor connected between the above 12th node and ground.
In Paragraph 3, The above negative voltage detection circuit is It is connected to the third node of the filter circuit above, and The above voltage divider circuit is An electronic device comprising a diode in which the negative electrode is connected toward the third node and the positive electrode is connected toward the ninth node.
In Paragraph 8, The above voltage divider circuit is A sensing circuit capacitor connected between the above 9th node and ground; A first resistor connected between the 9th node and the 10th node; A second resistor connected between the above 10th node and ground; A third resistor connected between the above positive voltage supply and the 11th node; and An electronic device comprising a fourth resistor connected between the 10th node and the 11th node.
In Article 9, The above low-pass filter is A filter resistor connected between the above 11th node and 12th node and An electronic device including a filter capacitor connected between the above 12th node and ground.
In a wireless power transmission device, A power amplifier circuit comprising a switch circuit, a filter circuit, and a series resonant circuit, which converts DC power to AC and implements zero voltage switching (ZVS); A power transmission circuit including a power transmission coil that transmits power received from the power amplifier circuit to the outside; A matching circuit connected between the power amplifier circuit and the power transmission circuit, and matching the impedances of the power amplifier circuit and the power transmission circuit; and It includes a negative voltage detection circuit connected to the filter circuit of the power amplifier circuit and detecting a negative voltage generated in the filter circuit, The above negative voltage detection circuit is A voltage divider circuit comprising a positive voltage supply and a plurality of resistors, which converts a negative voltage generated in the filter circuit of the power amplifier circuit into a positive voltage within a predetermined range; A voltage sensor for detecting the above-mentioned converted positive voltage; and A wireless power transmission device comprising a low-pass filter connected between the voltage divider circuit and the voltage sensor.
In Paragraph 11, The above switch circuit is An input power source connected between the first node and ground, which supplies DC power to the power amplifier circuit; A first coil connected between the first node and the second node, which blocks an alternating current signal that can flow to the input power source; A transistor connected between the second node and ground, which is turned on or off according to an electrical signal and acts as a switch for implementing soft switching using a zero-voltage switching (ZVS) method; A driver connected to the above transistor and generating a driver signal to drive the above transistor; and A wireless power transmission device comprising a first capacitor connected between the second node and ground.
In Paragraph 12, The above series resonant circuit is A second coil connected between the second node and the fourth node; and It includes a second capacitor connected between the fourth node and the fifth node; and The above filter circuit is A third coil connected between the second node and the third node; and A wireless power transmission device comprising a third capacitor connected between the third node and ground.
In Paragraph 13, The above matching circuit is A fourth coil connected between the above-mentioned fifth and sixth nodes; A fourth capacitor connected between the sixth node and ground; and It includes a fifth capacitor connected between the sixth node and the seventh node; and The power transmission coil of the above power transmission circuit is A wireless power transmission device connected between the 7th node and the 8th node.
In Paragraph 13, The above negative voltage detection circuit is It is connected to the third node of the filter circuit above, and The above voltage divider circuit is A first resistor connected between the third node and the ninth node and A wireless power transmission device comprising a diode in which the negative electrode is connected toward the 9th node and the positive electrode is connected toward the 10th node.
In Paragraph 15, The above voltage divider circuit is The sensing circuit capacitor connected between the above 10th node and ground A second resistor connected between the above 10th node and ground; A third resistor connected between the above positive voltage supply and the 11th node; and A wireless power transmission device including a fourth resistor connected between the 10th node and the 11th node.
In Paragraph 13, The above negative voltage detection circuit is It is connected to the third node of the filter circuit above, and The above voltage divider circuit is A wireless power transmission device comprising a diode in which the negative electrode is connected toward the third node and the positive electrode is connected toward the ninth node.
In Paragraph 17, The above voltage divider circuit is A sensing circuit capacitor connected between the above 9th node and ground; A first resistor connected between the 9th node and the 10th node; A second resistor connected between the above 10th node and ground; A third resistor connected between the above positive voltage supply and the 11th node; and A wireless power transmission device including a fourth resistor connected between the 10th node and the 11th node.
In electronic devices, processor; Battery; and It includes a wireless power transmitter, The above wireless power transmitter A power amplifier circuit comprising a switch circuit, a filter circuit, and a series resonant circuit, which converts direct current power received from the battery or DC adapter into alternating current and implements zero voltage switching (ZVS); A power transmission circuit including a power transmission coil that transmits power received from the power amplifier circuit to the outside; A matching circuit connected between the power amplifier circuit and the power transmission circuit, and matching the impedances of the power amplifier circuit and the power transmission circuit; and It includes a negative voltage detection circuit connected to the filter circuit of the power amplifier circuit and detecting a negative voltage generated in the filter circuit, The above negative voltage detection circuit is Precision rectifier circuit that converts alternating current to direct current; An inverting amplifier circuit that converts the negative voltage of the above filter circuit into a positive voltage; and An electronic device comprising a voltage sensor that detects the above-mentioned converted positive voltage.
In a wireless power transmission device, A power amplifier circuit comprising a switch circuit, a filter circuit, and a series resonant circuit, which converts DC power to AC and implements zero voltage switching (ZVS); A power transmission circuit including a power transmission coil that transmits power received from the power amplifier circuit to the outside; A matching circuit connected between the power amplifier circuit and the power transmission circuit, and matching the impedances of the power amplifier circuit and the power transmission circuit; and It includes a negative voltage detection circuit connected to the filter circuit of the power amplifier circuit and detecting a negative voltage generated in the filter circuit, The above negative voltage detection circuit is Precision rectifier circuit that converts alternating current to direct current; An inverting amplifier circuit that converts the negative voltage of the above filter circuit into a positive voltage; and A wireless power transmission device comprising a voltage sensor that detects the above-mentioned converted positive voltage.

Description

Wireless power transmitting device and electronic device including the same Various embodiments of the present disclosure relate to a wireless power transmission device including a negative voltage sensing circuit and an electronic device including the same. Wireless power transmission technology is used to supply power to electronic devices wirelessly. Wireless power transmission technologies can include magnetic induction and magnetic resonance methods. Magnetic induction has the disadvantage that the transmitter and receiver must be in close proximity for power transmission. Magnetic resonance has the advantage of being able to transmit power over relatively long distances by concentrating energy at a specific resonant frequency. A magnetic resonance wireless power transmitter may include a Class EF2 power amplifier (PA). The Class EF2 power amplifier can reduce switching losses caused by voltage-current superposition by using a soft switching technique called zero voltage switching (ZVS). The zero voltage switching method can reduce switching losses by making the voltage across the switch "0[V]" to minimize the voltage-current superposition period. FIG. 1 is a block diagram of an electronic device in a network environment according to various embodiments. FIG. 2 is a diagram showing the circuit configuration of a wireless power transmission device including a negative voltage detection circuit according to one embodiment of the present disclosure. FIG. 3 is a diagram showing the circuit configuration of a wireless power transmission device including a negative voltage detection circuit according to another embodiment of the present disclosure. FIG. 4 is a graph showing the voltage of a third capacitor and the current of a diode in a wireless power transmission device according to one embodiment of the present disclosure. FIG. 5 is a diagram showing the voltage of a third capacitor and the current of a diode in a wireless power transmission device according to another embodiment of the present disclosure. FIG. 6 is a graph exemplarily showing the change in sensor output voltage in a situation where the input impedance of a wireless power transmission device according to various embodiments of the present disclosure is capacitive. FIG. 7 is a graph exemplarily showing the change in sensor output voltage in a situation where the input impedance of a wireless power transmission device according to various embodiments of the present disclosure is inductive. FIG. 8 is a diagram showing the circuit configuration of a wireless power transmission device including a negative voltage detection circuit according to another embodiment of the present disclosure. FIG. 1 is a block diagram of an electronic device (101) in a network environment (100) according to various embodiments. Referring to FIG. 1, in the network environment (100), the electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network) or may communicate with at least one of an electronic device (104) or a server (108) through a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) through a server (108). According to one embodiment, the electronic device (101) may include a processor (120), memory (130), input module (150), sound output module (155), display module (160), audio module (170), sensor module (176), interface (177), connection terminal (178), haptic module (179), camera module (180), power management module (188), battery (189), communication module (190), subscriber identification module (196), or antenna module (197). In some embodiments, at least one of these components (e.g., connection terminal (178)) may be omitted from the electronic device (101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (176), camera module (180), or antenna module (197)) may be integrated into a single component (e.g., display module (160)). The processor (120) can control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) by executing software (e.g., a program (140)), and can perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (120) can store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in volatile memory (132), process the commands or data stored in volatile memory (132), and store the resulting data in non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or processor) or an auxiliary processor (123) that can operate independently or together with it