摘要:
An induction cooking system (10) comprises a power supply bus (52) and a plurality of resonant inverters (44, 100) in connection with the power supply bus (52). Each of the resonant inverters (44, 100) comprises a dedicated resonant capacitor (60, 102). The system (10) further comprises a plurality of inductors (16) configured to generate an electromagnetic field in connection with the resonant inverters (44, 100). At least one switch (64, 72) is configured to control a plurality of switch configurations. A tuning capacitor (62) is in connection with each of the dedicated resonant capacitors (60, 102) via the at least one switch (64, 72). The at least one switch (64, 72) is configured to selectively connect the tuning capacitor (62) in parallel with one of the dedicated resonant capacitors (60, 102) in each of the plurality of switch configurations.
摘要:
A system, method, and apparatus for stabilizing interactions between an electrical generator and a nonlinear load are described. One illustrative embodiment includes an impedance element that is coupled to an output of the generator and a power source coupled to the impedance element. The power source applies power to, or across, the impedance element so as to reduce energy loss that would ordinarily occur due to energy dissipation by way of the impedance element. In many variations, the power source operates within a defined bandwidth so that a stabilizing effect is achieved outside of this bandwidth.
摘要:
The present invention relates to a cooking hob (10) including at least two cooking zones (16, 18) and a balance system for adjusting the temperature of a cooking vessel (20) after said cooking vessel (20) has been moved from a first cooking zone (16) to a second cooking zone (18). The cooking zones (16, 18) comprise or correspond with a vessel recognition device in each case. The cooking hob (10) includes a sensor device for detecting the temperature of the first cooking zone (16). The balance system is provided for activating a boosted power level (30) at the second cooking zone (18) for an estimated time in order to compensate the energy loss (Q s ) of the cooking vessel (20) during setting said cooking vessel (20) on the second cooking zone (18). The boosted power level (30) is estimated on the basis of a pre-set power level (28) of the second cooking zone (18), the temperature of the first cooking zone (16) before the cooking vessel (20) has been set on the second cooking zone (18) and an estimated time for activating the boosted power level (30). Further, the present invention relates to a method for adjusting the temperature of a cooking vessel (20) on a cooking hob (10), after said cooking vessel has been moved from one cooking zone (16) to another cooking zone (18).
摘要:
An induction heating system (20) is provided. The induction heating system (20) comprises a power switch (26), a resonant heating circuit (24), and a pulse initiator (30). The resonant heating circuit (24) is configured to generate an oscillating voltage in response to a DC pulse input. The pulse initiator (30) is positioned across the power switch (26) and configured to monitor a voltage across the power switch and to initiate application of a subsequent DC pulse to the resonant heating circuit (24) upon detecting a substantially zero voltage crossing at the power switch (26) during a first cycle of the oscillating voltage.
摘要:
The invention relates to a power supply system for supplying a single phase load, especially a single phase induction furnace (O), from the three-phase network, characterized in that a power converter (S) is provided that has, in addition to the two initial potentials for connecting a parallel compensated load (O) at least one additional initial potential, and in that one or more balancing reactances for energy storage having dual initial frequency are connected between said additional initial potential and one of the initial potentials for connecting the load (O), or between the additional initial potentials. The system is further characterized in that the control of the converter and/or the balancing reactances can be adapted to the impedance of the load (O) in various operating points. The invention also relates to a control method for controlling the supply of a single phase load, especially a single phase induction furnace (O), from the three-phase network comprising a device according to one of the preceding claims. The inventive method is characterized by facilitating the variation of the amplitude and/or the phase position and/or the frequency of the output voltages when the resistance and/or the inductance of the load change, thereby adjusting power. In this manner it is possible to reduce the amount of reactances, i.e. of inductances and/or capacitors, required.