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公开(公告)号：US20240324069A1
公开(公告)日：2024-09-26
申请号：US18124865
申请日：2023-03-22
申请人： LG ELECTRONICS INC.
发明人： Kyelyong KANG , Jinwook Han
CPC分类号： H05B1/0266 , H05B6/04 , H05B6/062
摘要： An induction heating apparatus of one embodiment may comprise a rectifying circuit rectifying an AC voltage supplied from a power source, a smoothing circuit connecting to the rectifying circuit and smoothing a voltage output from the rectifying circuit, a first switching element having a first terminal that connects to a working coil, and a second terminal that connects to the smoothing circuit, a second switching element connecting to the first switching element in parallel, a driving circuit supplying a first switching signal to the first switching element and a second switching signal to the second switching element, and a controller outputting a first control signal corresponding to the first switching signal, and a second control signal corresponding to the second switching signal.
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公开(公告)号：US12035445B2
公开(公告)日：2024-07-09
申请号：US16556849
申请日：2019-08-30
发明人： Emmanuel Marchais , Zhong You
摘要： A resonant frequency tracker for driving an electromagnetic load with a driving signal may include a signal generator configured to generate a waveform signal at a driving frequency for driving an electromagnetic load and control circuitry. The control circuitry may be configured to, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receive a current signal representative of a current associated with the electromagnetic load and a second signal representative of a second quantity associated with the electromagnetic load, the second quantity comprising one of a voltage associated with the electromagnetic load or a back electromotive force of the electromagnetic load. The control circuitry may be further configured to calculate a phase difference between the current signal and the second signal, determine a frequency error of the waveform signal based on the phase difference, and control the driving frequency based on the frequency error.
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公开(公告)号：US11903114B2
公开(公告)日：2024-02-13
申请号：US17303557
申请日：2021-06-02
摘要： A method for operating an induction hob (100), wherein the induction hob (100) comprises: an inverter (1), which is supplied with a supply voltage (US), at least one capacitor (2, 3), and an induction heating coil (4), wherein the at least one capacitor (2, 3) and the induction heating coil (4) are interconnected such that they constitute an oscillating circuit (5), and wherein the inverter (1) is configured to generate a pulse-width modulated excitation voltage (UA) for the oscillating circuit (5) from the supply voltage (US), wherein the method comprises the following steps: a) generation of the pulse-width modulated excitation voltage (UA) having a predefined voltage characteristic, b) measurement of a resulting oscillating circuit current (iS), particularly by means of the induction heating coil (4), c) determination of electrical oscillating circuit parameters, according to the voltage characteristic of the pulse-width modulated excitation voltage (UA) and the measured oscillating circuit current (iS), d) n-times repetition of steps a) to c) using a different voltage characteristic of the excitation voltage (UA) for the determination of electrical voltage characteristic-dependent oscillating circuit parameters, and e) determination of operating variables of the induction hob (100) from voltage characteristic-dependent electrical oscillating circuit parameters.
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公开(公告)号：US20240049366A1
公开(公告)日：2024-02-08
申请号：US18488027
申请日：2023-10-16
发明人： Thiam-Wee TAN , Cheng-Chung LI , Chun CHANG , Yu-Min MENG
CPC分类号： H05B6/062 , H05B6/04 , H05B2206/02
摘要： A heating device includes a first capacitor, a first switch, a second switch, a second capacitor, a third capacitor, a coil and a controller. The first and second switch are coupled in series at a first node, and are coupled with the first capacitor in parallel. The second capacitor is coupled to the first switch. The third capacitor is coupled to the second switch, and is coupled to the second capacitor at a second node. The coil is coupled between the first and the second node. The controller outputs a first and a second control signal to the first switch and the second switch, respectively. After the heating device received a voltage and a starting command, the controller outputs the first and the second control signal to turn on or off the first and the second switch respectively. The duty cycle of the first signal is lower than 50%.
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公开(公告)号：US11882640B2
公开(公告)日：2024-01-23
申请号：US17313427
申请日：2021-05-06
申请人： LG ELECTRONICS INC.
发明人： Sihoon Jeong , Kyelyong Kang , Hanna Kim
摘要： An induction heating apparatus is configured to determine a third driving frequency corresponding to a third required power value when the required power value of the first working coil or the second working coil is changed to the third required power value, to calculate a difference value between the driving frequency of the working coil (the required power value of which is not changed) and the third driving frequency, to change an operation mode or a power control mode of the first inverter circuit or the second inverter circuit when the difference value is included in a predetermined first reference range, and to change an output power value of the working coil (the required power value of which is changed) to the third required power value.
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公开(公告)号：US11751291B2
公开(公告)日：2023-09-05
申请号：US17150458
申请日：2021-01-15
发明人： Tomoyuki Kanagawa , Masaki Ono , Masashi Sasagawa , Masayuki Otawara , Nobuhara Nishikoori , Taro Yoshida , Yutaka Yagi
摘要： An induction heating apparatus is provided. The induction heating apparatus includes a heating coil, an inverter, a current sensor configured to measure a driving current supplied from the inverter to the heating coil, and a controller configured to provide a drive signal to the inverter to allow the driving current to follow a target current based on a user input. The controller reduces a driving duty of the drive signal based on the driving current exceeding a predetermined reference current, and the controller provides a drive signal to the inverter to allow the driving current to follow a current less than the target current, based on the driving current being less than or equal to the predetermined reference current after reducing the driving duty of the drive signal.
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公开(公告)号：US20230217552A1
公开(公告)日：2023-07-06
申请号：US18000467
申请日：2021-05-31
申请人： COWAY CO., LTD.
发明人： Young Kook KIM , Yeon Soo SEONG , Kyo Eon OH , Eui Soon LEE
IPC分类号： H05B6/06 , H02M7/5387 , H02M1/08 , H05B6/04
CPC分类号： H05B6/062 , H02M1/08 , H02M7/53871 , H05B6/04
摘要： Disclosed are a power conversion device, an electric range including same, and a control method therefor. The electric range of the present invention comprises: a plate; a working coil; an interface unit; a voltage providing unit for providing a rectified voltage to the working coil; a first switching element; a second switching element connected in parallel with the first switching element; and a control unit, wherein the control unit determines a driving signal for driving at least one of the first switching element and the second switching element, according to the temperatures of the first switching element and the second switching element, and outputs same to the first switching element and the second switching element, and when the rectified voltage is greater than or equal to a predetermined level, the control unit provides the first switching element and the second switching element with driving signals for driving the first switching element and the second switching element, respectively, and when the rectified voltage is less than the level, the control unit transmits a driving signal to a switching element having a lower temperature among the first switching element and the second switching element, and provides an off control signal to the switching element having a higher temperature.
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公开(公告)号：US11692419B2
公开(公告)日：2023-07-04
申请号：US17401705
申请日：2021-08-13
CPC分类号： E21B43/2401 , E21B47/06 , E21B47/07 , H02S10/12 , H02S99/00 , H05B6/04 , H05B6/10 , H05B2206/022
摘要： A method of improving natural gas recovery from a subterranean hydrocarbon reservoir includes at least one renewable energy source that is electrically coupled with a heat conducting element. The heat conducting element is positioned in a perforated section of a wellbore that traverses into the subterranean hydrocarbon reservoir. A temperature of the subterranean hydrocarbon reservoir is maintained above a cricondentherm temperature so that liquid condensation may be prevented at a final production time. In order to maintain the temperature within a required temperature range, an internal temperature, an internal pressure, and a set of reservoir properties are monitored and then utilized to plot a phase diagram that can be used to detect liquid condensation. If liquid condensation is detected, an electrical output of the renewable energy source is adjusted in order to control the temperature of the subterranean hydrocarbon reservoir at a producing end of a production tubing.
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公开(公告)号：US11570855B2
公开(公告)日：2023-01-31
申请号：US16477753
申请日：2018-01-05
申请人： LG ELECTRONICS INC.
发明人： Bong Jin Cho , Jinwook Han , Seongho Son
摘要： The present invention relates to an induction heating cooker including a synchronization circuit for a plurality of inverters, comprising: a first inverter including a first switching circuit unit for applying a first power source to a first heating coil, and a first control unit for controlling the first switching circuit unit; and a second inverter including a second switching circuit unit for applying a second power source to a second heating coil, and a second control unit for controlling the second switching circuit unit, wherein the first inverter further includes a first insulated signal transfer unit for controlling an operation of the second switching circuit unit, and the first control unit may match an operating frequency of the second switching circuit unit with an operating frequency of the first switching circuit unit by using the first insulated signal transfer unit.
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公开(公告)号：US11490467B2
公开(公告)日：2022-11-01
申请号：US16745298
申请日：2020-01-16
申请人： Tuanfang Liu
发明人： Tuanfang Liu
摘要： An electromagnetic induction heater, including: a first cover plate; an inductive coil; a housing; a glass pipe; a second cover plate; a first control plate; a second control plate; a power button; a first baffle plate; a pair of electrodes; a third cover plate; a battery; a support frame; a battery connector; a spring; and a second baffle plate. The pair of electrodes is disposed on the support frame. The first baffle plate is disposed on the pair of electrodes and is fixed on the support frame. The spring butts against the battery connector. The spring and the battery connector are disposed in one end of the support frame. The second baffle plate is directly connected to the spring and fixed on the one end of the support frame. The support frame is disposed in the housing. The inductive coil is disposed on the first control plate.
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