82results about "Induction current sources" patented technology

An induction cooktop comprises a cooktop surface, induction heating coils beneath it, a power supply with power semiconductors for the induction heating coils, and an external electrical connection. The power supply is located on a power circuit board, and the electrical connection is located on a connection circuit board. At least one cooling device is also provided, comprising at least one fan with a fan inlet for intake and a fan outlet for exhaust air to cool the power supply, a cooling air duct, and at least one heat sink to which the cooling air duct leads. In a vertical direction perpendicular to the cooktop surface and to one of the circuit boards, the fan is positioned lower than the heat sink.The connection circuit board runs below the power circuit board, the connection circuit board has an electrical connection to the outside, and the cooling air duct runs with a bend and deflection of 90° or 180° between the fan outlet and the heat sink.

The application discloses an electromagnetic heating circuit, a control method and device of an electrical appliance, and the electrical appliance. The circuit comprises at least two resonance modules, at least two switch modules, an inverter module, a gating module, an oscillation driving module, a voltage signal extraction module, and a control module. The switch module comprises a fixed end, a movable end, a first position end, and a second position end. The fixed end of the at least two switch modules is connected to the at least two resonance modules one by one. The inverter module is connected to the first position end. The gating module is connected to the second position end. The oscillation driving module is connected to the gating module. The voltage signal extraction module is connected to the oscillation driving module. The control module is connected to the inverter module, the voltage signal extraction module, the gating module, and the at least two switch modules. The technical scheme provided by the embodiment of the application can detect whether a pot is placed at a position corresponding to a resonance module not in a heating state when part of the resonance modules in the electromagnetic heating circuit are in the heating state.

An induction cooktop has a cooktop plate, induction heating coils thereunder, a power supply with power semiconductors for the induction heating coils and an electrical connection to the outside, wherein the power supply is arranged on a power printed circuit board and the electrical connection is arranged on a connection printed circuit board. At least one cooling device is also provided, which has at least one fan with a fan inlet as intake and with a fan outlet for blown-out air for cooling the power supply, a cooling air duct and at least one heat sink, to which the cooling air duct leads. The fan is arranged lower than the heat sink in a vertical direction which runs at right angles to the cooktop plate and to one of the printed circuit boards. The connection printed circuit board runs underneath the power printed circuit board, the connection printed circuit board has an electrical connection to the outside and the cooling air duct runs with a bend and deflection of 90° or of 180° between the fan outlet and the heat sink.

This application discloses an electromagnetic heating circuit, a control method, a device, and an electrical device. The electromagnetic heating circuit includes N resonant modules, an inverter module, N pot detection modules corresponding one-to-one with the N resonant modules, N switching switches corresponding one-to-one with the N resonant modules, a first expansion module, and a control module. The first expansion module may include multiple first expansion units, with any N first connection terminals of the multiple first expansion units connected one-to-one with the N pot detection modules. A first common connection terminal is connected to a first interface of the control module, allowing the control module to receive N pot detection signals output by the N pot detection modules through multiple first interfaces, while the number of first interfaces is much smaller than the number of pot detection modules. Therefore, the electromagnetic heating circuit in this application can expand the input of the control module by setting a first expansion module, thereby saving interface resources of the control module and reducing the difficulty of chip selection.

The invention relates to the technical field of induction heating devices, and discloses a load self-adaptive induction heating power supply, which comprises a double-gain inverter circuit module for outputting two kinds of level equal-level voltage and a load self-adaptive resonance module capable of performing impedance matching on a ferromagnetic load and a non-ferromagnetic load. According to the application, a constant-voltage output mode and a constant-current output mode are realized by changing the working frequency and are respectively used for heating a ferromagnetic material with a relatively low quality factor and a non-ferromagnetic material with a relatively high quality factor, and wide-range high-efficiency power regulation in a half-gain mode and a full-gain mode is realized by changing the switching state; the power supply has the output characteristics of pure resistive input, zero input phase angle and load equivalent resistance irrelevance, and the loss of a switching tube is relatively low; the power supply has a load self-adaptive detection method, so that the load type can be identified on line to work in a proper heating mode; the number of power switch tubes is small, a two-way switch switching matching circuit is not needed, and heating of loads made of different materials can be well coped with.

This invention discloses a dual-frequency induction heating power supply inverter drive control system and method, belonging to the field of induction heating power supply technology. The dual-frequency induction heating power supply inverter drive control system includes: a rectifier, a filter, and an inverter connected in sequence. The rectifier is connected to a rectifier control circuit, and the inverter is connected to an inverter drive control circuit. The inverter includes three inverter bridge arms. The inverter drive control circuit includes a controller and drive control circuits corresponding to the three inverter bridge arms. The controller collects the inverter current signal and inverter voltage signal from the inverter to generate an inverter frequency control signal, achieving precise control of the switching state of each inverter bridge arm, thereby adjusting the inverter's operating frequency and output power. This invention achieves precise control of the inverter output signal, effectively improving the heating efficiency and uniformity of the dual-frequency induction heating power supply.

This invention belongs to the field of photovoltaic cell manufacturing technology and discloses an induction heating device and method for the curing and sintering of electrode paste, solving the problems of high energy consumption, poor temperature uniformity, high pollution, and slow response of traditional infrared heating. The device includes five main components: induction heating, load-bearing conveying, temperature control monitoring, etc. The induction heating power supply has a frequency of 30 kHz-80 kHz and a power of 5 kW-200 kW. The temperature control component regulates power in a closed loop, and the atmosphere protection component controls oxygen to ≤100 ppm. The method involves controlling the sintering atmosphere and activating the magnetic field to uniformly feed the silicon wafer substrate into the induction zone, causing the electrode paste layer to heat up at 50-300℃ / min, curing at 50-300℃, sintering at 700-900℃, with temperature fluctuations ≤±3℃ throughout the process, and finally precisely cooling to room temperature. This invention achieves selective heating of the paste, high thermal efficiency, and miniaturized equipment, adapting to high-efficiency photovoltaic cells and new pastes, improving cell conversion efficiency and product consistency, and reducing production risks.

The invention discloses a cooking utensil, electromagnetic heating equipment and a power supply control method and system. The cooking utensil comprises a first communication device and a parameter detection device, wherein the parameter detection device is used for generating a parameter detection signal; the first communication device is used for generating an induction power supply signal according to a first magnetic field of the electromagnetic heating equipment and supplying power to the parameter detection device through the induction power supply signal; the first communication device is further used for transmitting the parameter detection signal to the electromagnetic heating equipment, generating a communication power supply signal according to a second magnetic field of the electromagnetic heating equipment and supplying power to the parameter detection device through the communication power supply signal, parameter detection is carried out through the cooking utensil, the timeliness of parameter detection can be ensured, and the user experience is improved. And power is supplied through the electromagnetic heating equipment, so that the cooking utensil does not need to frequently replace a battery and connect an external power supply wire, and the cooking utensil can conveniently and safely obtain power supply support.

The invention relates to an induction heating device for heating a metallic good, comprising a number of at least two resonant circuits for generating a magnetic field for heating the metallic good, and a power supply device for supplying the resonant circuits with electrical energy, comprising a disconnect switch for connecting the induction heating device to an electrical power supply, and at least one inverter for converting a direct current into an alternating current for supplying energy to a resonant circuit, wherein the power supply device has a switching device, wherein the switching device is configured to enable at least indirect energy coupling between the disconnect switch and the resonant circuits, wherein the number of simultaneously energy-coupling resonant circuits is smaller than the number of resonant circuits of the induction heating device.

The invention relates to a double-loop control method and system for medium-frequency induction heating of a semiconductor liquid source, and belongs to the technical field of semiconductor manufacturing configuration equipment. The method comprises the steps that the medium-frequency induction electric frequency is obtained, the resonant frequency is synchronously adjusted, and a liquid source heating control basis is provided; constructing a temperature-pressure double-loop feedback curve, dynamically adjusting the inversion output power through a proportional-integral algorithm, and controlling the amplitude and distribution of the medium-frequency induction heating current; through a differential serial communication protocol, the signals are transmitted to the flexible heating coil through a twisted-pair shielded wire and a differential signal interface, and the liquid source is heated by the induction eddy current; and controlling the temperature of the induced eddy current heat source based on a fanless cooling scheme, adjusting the cooling intensity by associating the medium-frequency induced electric frequency, and executing power limitation when the load impedance is abnormal based on built-in safety interlocking logic when the liquid source temperature is monitored to deviate from a preset safety cooling temperature interval.

A home appliance is provided that may include a first air flow path included in a heat sink, and a second air flow path defined at a lower side of the heat sink, such that air flows to inside and outside of the heat sink efficiently. A plurality of heat dissipation fins may protrude downward from a wall of the second air flow path, increasing a contact surface between the heat sink and air. A projection may be formed on at least one of the walls of the first air flow path, the walls of the second air flow path, an outer surface of the plurality of heat dissipation fins, or an upper surface of the heat sink.

The invention provides an induction heating cooker, and a control device and a control method for the induction heating cooker, which can suppress interference sound. This induction heating cooker is provided with: a first heating coil for heating the center region of the bottom surface of a heating container; a second heating coil that is disposed concentrically with the first heating coil and heats an outer peripheral region of the central region of the heating container; a first inverter circuit that supplies a high-frequency current to the first heating coil; a second inverter circuit that supplies a high-frequency current to the second heating coil; and a control unit that controls the first inverter circuit and the second inverter circuit, the control unit operating the first inverter circuit and the second inverter circuit at substantially the same operating frequency when a high-frequency current is supplied to the first heating coil and the second heating coil.

The invention discloses a self-adaption method of a power supply voltage self-adaption induction cooker, and relates to the technical field of induction cookers. The self-adaptive method comprises the following steps of: 1, preparing a self-adaptive power supply; step 2, voltage self-adaption method: detecting the magnitude of the voltage through a voltage detection circuit, detecting the magnitude of the input power supply voltage through the voltage detection circuit by a machine, then transmitting the magnitude of the input power supply voltage to a microcomputer processor of the induction cooker, and switching to a corresponding resonance circuit according to the detected voltage by the microcomputer processor of the induction cooker; and meanwhile, a pin 2 of a microcomputer processor of the induction cooker outputs a corresponding PWM control signal to control the conduction time of a switch tube, the machine automatically switches corresponding modes and hardware circuits under different voltages, the machine can output 1300-1800W power under the voltage of 100V-127V, the machine can output 1800-2500W power under the voltage of 220V-240V, and the heating efficiency is high.

A system for controlling an induction cooking apparatus includes resonant loads each having an induction coil of said induction cooking apparatus, switching circuitry including a shared half-bridge, and a plurality of secondary half-bridges each cooperating with the shared half-bridge to form a plurality of full-bridge inverters. Control circuitry is configured to determine a plurality of target power levels including a target power level for each one of the plurality of resonant loads, calculate a switching frequency common to the shared half-bridge and the plurality of secondary half-bridges based on the comparison of the target levels, generate a plurality of control signals each for application to a half-bridge of the plurality of secondary half-bridges, calculate a phase displacement for each of the plurality of control signals, and determine a maximum current through the shared half-bridge independent of an orientation of the phase displacement for each of the plurality of control signals.

The invention discloses a dual-frequency induction heating power supply inverter output frequency control method, terminal equipment and a storage medium. In order to solve the problems that high-frequency and low-frequency resonance points drift and output frequency is difficult to track smoothly due to the fact that load equivalent parameters change along with working conditions, the method calculates amplitudes and phase differences of high-frequency and low-frequency channels according to output voltage and current sampling, constructs impedance parameters to estimate high-frequency and low-frequency target resonance frequencies, and obtains a constraint target frequency vector in combination with a preset working frequency band. A discrete time frequency trajectory controller is constructed, a frequency increment is calculated by taking a frequency error and the frequency increment as state variables, frequency increment amplitude limiting and double-frequency minimum frequency interval constraint are introduced to update high and low frequency output frequencies, and a gain selection condition is given through a closed-loop difference equation. The terminal equipment executes a program stored in a storage medium through a processor to realize the method, and stable resonance tracking and settable control of the dual-frequency output frequency can be realized without a precise load model.

Embodiments concern a plant for melting and / or heating metal material and a corresponding method to supply electrical energy. The plant comprises at least one induction furnace (11) and means (12) for supplying electrical energy to the induction furnace 11), wherein the electric power supply means (12) comprise at least one transformer (13) connected to an alternating current mains power network (14), at least one rectifier (15) located downstream of the transformer (13), at least one converter (16) located downstream of the rectifier device (15), and at least one coil (17) for melting and / or heating metal material.

Systems, devices and methods for wirelessly charging a water heater device are presented. A system for wirelessly charging a water heating device, the system comprising: the water heating device, wherein the water heating device comprises a water heating element; a wireless power transmitter configured to: receive a first electrical current from a first power source; and generate a magnetic field, an ultrasonic wave, a microwave, a wireless power transmission, or a laser pulse based on the first electrical current; and a wireless power receiver configured to: generate a second electrical current based on the magnetic field, the ultrasonic wave, the microwave, the wireless power transmission, or the laser pulse; and provide the second electrical current to the water heating element or to a second power source of the water heating device.

The invention relates to a domestic appliance device (10a-e), in particular a cooking appliance device, comprising at least one control unit (12a-e) which is provided to control at least one induction target (14a-e) repetitively with a switching frequency (16a-e) and to supply same with power. According to the invention, in order to provide a generic device with improved efficiency, the control unit (12a-e), in an operating state, modulates the switching frequency (16a-e) within a modulation period (18a-e) which corresponds to an integer multiple of a half period duration (20a-e) of a mains AC voltage (22a-e), by means of at least one frequency modulation.

The invention relates to the technical field of induction heating, and discloses an induction heating power supply system, which comprises a main control unit, a power regulation loop, a frequency modulation loop and a load loop, and is characterized in that the main control unit is connected with the power regulation loop and the frequency modulation loop, and the output end of the power regulation loop is connected with the input end of the frequency modulation loop; the output end of the frequency modulation loop is connected with the input end of the load loop; the power regulation loop comprises a driving module and a sampling module, the driving module is used for receiving a driving signal, regulating the output power of the power regulation loop and controlling the on-off of the power regulation loop, and the sampling module is used for collecting a power regulation loop signal and feeding back the power regulation loop signal to the main control unit; the frequency modulation loop comprises a driving module and a sampling module, and the main control unit adjusts the frequency of a driving signal according to a signal fed back by the sampling module in the frequency modulation loop, so that the output current and the output voltage maintain a preset phase difference, namely, the load loop maintains a quasi-resonance state.

In a method for controlling an induction coil on an induction cooktop, power generation is set to provide primary power at the induction coil for power transfer to an electrical device with a receiver coil and connected electrical load, which is positioned on a cover above the induction coil. The induction coil forms a primary-side resonant circuit with a capacitor connected in series. The induction coil and the receiver coil are coupled such that a current in the induction coil induces a voltage in the receiver coil, resulting in current flow and the generation of secondary power in the electrical device's load. The control mechanism can attempt to maintain the desired secondary power by maximizing the voltage effectively applied to the primary-side resonant circuit as a second control variable.To reduce the primary power in a first step, the voltage effectively applied to the primary-side resonant circuit is reduced as the second control variable before the operating frequency is increased as the first control variable in a second subsequent step.

The invention relates to an induction heating type cooking bench. The induction heating type cooking bench comprises: a housing; the cover plate is connected to the upper end of the shell and is provided with an upper plate part on which an object to be heated is arranged; the working coil is arranged in the shell; a thin layer coated on the upper plate portion and inductively heated by the working coil; and a working coil cooling fan configured to blow air toward the working coil.

Various embodiments of the present technology comprise a method and system for induction heating. The system may provide a first induction coil wrapped around a metal cylinder and a second induction coil wrapped around the metal cylinder. The first induction coil may carry a current in a first direction and the second induction coil may carry a current in an opposite, second direction. The currents may be generated in an alternating sequence.

An induction heating apparatus according to one embodiment of the present invention includes: a first operating coil for a first burner; a second operating coil for a second burner; an inverter including a plurality of switches that are switched so that current flows in the first operating coil and the second operating coil; and a processor for controlling the switching of the plurality of switches of the inverter, wherein the operating frequency of the first operating coil and the operating frequency of the second operating coil differ by at least a predetermined frequency value due to the inductance value of the first operating coil and the inductance value of the second operating coil.

An electric induction heating system for heating a workpiece having an undulating perimeter includes a low frequency coil and a high frequency coil arranged to heat the workpiece, a low frequency induction circuit coupled to the low frequency coil to induce a low frequency output less than about 50 kHz, wherein the low frequency induction circuit comprises at least two low frequency power sources, a high frequency induction circuit coupled to the high frequency coil to induce a high frequency output greater than about 100 kHz, wherein the high frequency induction circuit comprises at least two high frequency power sources, and a controller connected to the low frequency induction circuit and the high frequency induction circuit and operable to induce the low frequency output alone, the high frequency output alone, and the low frequency output and the high frequency output simultaneously.

The present application relates to the technical field of induction heating power supply, and particularly relates to a real-time dynamic matching circuit for an induction heating power supply. The present application proposes a dynamic load matching circuit for CCL or CCCL series-parallel resonance, which realizes real-time automatic impedance matching by adjusting the working proportion of switch capacitors in the capacitor group online without stopping the machine, thereby replacing the traditional manual adjustment mode and avoiding the problems of slow manual operation speed and easy errors. In addition, due to the online dynamic matching function, the circuit can complete parameter adjustment without stopping the system operation, and is suitable for occasions with high requirements for process continuity. This effectively avoids the problem of large fluctuations in the furnace temperature caused by shutdown maintenance and restart of the induction heating power supply, and is beneficial to maintaining process stability. At the same time, through the configurable capacitor group design, the circuit can realize a wider load matching range and adapt to diversified application requirements.

Disclosed herein is an induction heating device that provides improved user experience and user interface, the induction heating device including a a second control module configured to receive information on a position of the sensed object subject to heating from the first control module, and to control the specific image displayed on the input interface on the basis of the received information on the position of the object subject to heating, wherein, in case the object subject to heating includes first and second objects subject to heating placed close to each other, the second control module controls the input interface such that an image for guiding an optimal heating position of any one object subject to heating of the first and second objects subject to heating is displayed on the input interface.

To provide an electromagnetic induction heating device that can efficiently supply the desired power to a heated object.SOLUTION: An electromagnetic induction heating device includes a heating coil, a DC power supply, a step-down chopper circuit, and an inverter. The step-down chopper circuit includes: a first upper and lower arms being a series body of two switching elements; a step-down choke coil with one end connected to the output terminal of the first upper and lower arms; and a smoothing capacitor connected between the other end of the step-down choke coil and one end of the DC power supply. The inverter includes: second upper and lower arms being a series body of two switching elements; a heating coil with one end connected to the output terminal of the second upper and lower arms; a first resonant capacitor connected between the other end of the heating coil and one end of the smoothing capacitor; and a series body of a relay connected between the output terminal of the first upper and lower arms and the other end of the heating coil and a second resonant capacitor. The first upper and lower arms, when not operating as a part of the inverter, operates as a part of the step-down chopper circuit.SELECTED DRAWING: Figure 1

The application relates to the technical field of induction heating devices, and discloses a modular double-frequency constant-current output type induction heating power supply which comprises a plurality of double-frequency constant-current output modules and a double-frequency resonant circuit connected with the plurality of double-frequency constant-current output modules, and the double-frequency resonant circuit is used for impedance matching of a heating coil; wherein one double-frequency constant-current output module comprises one double-frequency inverter circuit unit connected and used for outputting double-frequency voltage and one double-frequency synthetic constant-current resonant unit used for converting double-frequency constant voltage into double-frequency constant current. In the application, each module has double-frequency constant-current output characteristics irrelevant to equivalent resistance of a load, pure resistive input impedance, good double-frequency circulating current suppression effect, low cost, small switching tube loss, and the modules can be connected in parallel for power expansion; a hybrid control method of module number switching and double-frequency pulse density control is adopted to realize a wide power regulation range, and the application can adapt to heating of non-uniform workpieces of different sizes.

An induction heating assembly (11, 111) for an aerosol-generating device (10) includes a heating chamber (18) for receiving at least a portion of an aerosol-generating substrate (102), an induction coil (58) positioned outside the heating chamber (18) for generating an electromagnetic field, and a holder (36) positioned inside the heating chamber (18). The induction heating assembly (11, 111) further includes an inductively heatable susceptor (48) mounted in the holder (36), the inductively heatable susceptor (48) having an inner surface (48a) and an outer surface (48b), and a temperature sensor (64) mounted to the holder (36) in contact with the outer surface (48b) of the inductively heatable susceptor (48).

The invention relates to an induction preheating device and method for welding a copper alloy annular seam, the induction preheating device comprises an induction power supply, a cover body, an induction coil, a silicon steel sheet and a positioner, a containing cavity is formed in the cover body, an air inlet hole and an air outlet hole are formed in the containing cavity, the induction coil is located in the containing cavity, and the silicon steel sheet is located in the induction coil. The position changing machine is located below the induction coils, a concave containing groove is formed in the position changing machine, a silicon steel sheet is arranged in the containing groove, the induction coils correspond to the silicon steel sheet and are used for being arranged on the two sides of a welding seam, and the induction coils are electrically connected with the induction power source. By means of the non-contact heating characteristic of electromagnetic induction, compared with traditional overall furnace feeding or flame baking, local heating can be accurately achieved, the heating efficiency is greatly improved, energy consumption is reduced, pollution caused by contact type heating is avoided, and meanwhile the problems that traditional preheating temperature control is poor, and uniformity is insufficient are solved.