Conductance Control for Electromagnetic-Compatible Induction Heating Appliances

Abstract

The design requirements of induction hobs are strongly restricted by efficiency, heating performance, cost, the generation of acoustic noise and electromagnetic compatibility (EMC). These two latter topics, cost and EMC, motivated the research presented in this work. The different levels at which the equivalent load of the induction hob is excited generate a variation of the equivalent impedance throughout the grid period even if all the other parameters are kept constant. This can cause a non-sinusoidal consumption of the grid current which goes against the compliance with EMC standards. This paper proposes an online controller which controls the conductance seen by the inverter by only modifying the switching frequency throughout the bus period. This greatly reduces the harmonic distortion of the grid current no matter what is the type of the vessel used. Moreover, it requires neither power-factor correction rectifiers nor any additional circuitry and it has a faster dynamic response with respect to the traditional solutions used in induction hobs due to its higher bandwidth.

A comparison statement on DCPWM based conducted EMI noise mitigation process in DC-DC converters for EV

“…But generating a random pulse module makes the circuit complicated. Chaotic pulse width modulation technique is derived from random pulse modulation and the DC-DC converters are operated in chaotic mode by incorporating an external circuit that is used to generate chaotic carrier signal [11]- [13]. Analog and digital approaches are the two types of approaches used to generate chaotic carrier waves.…”

Study of half‐bridge series‐resonant induction cooker powered by line rectified DC with less filtering

“…In [21], least mean squares based on fuzzy c‐means clustering were used for load identification. To reduce the noise of the induction cooker and meet the electromagnetic compatibility (EMC), literature [22] uses conductance control to reduce the harmonic distortion of the grid current. Although the above contributions have been of major benefit in improving and developing the functionality of the IH cooker, studies of the power supply affecting the IH performance remain rare and are only mentioned in [16] to modify the power supply to increase induction efficiency.…”

Series-Resonant Matrix Inverter With Asymmetrical Modulation for Improved Power Factor Correction in Flexible Induction Heating Appliances

“…This issue is a major concern in induction cooktops as they have to fulfill electromagnetic compatibility regulations [10] while enabling the final user to use the desired pot regardless its non-linear behavior. A typical solution considered in the literature relies in using a low value bus capacitor that allows high power factor with a cost-effective implementation [11][12][13][14][15], which can be complemented by applying a frequency sweep to compensate the aforementioned THD [16][17][18][19][20]. Additionally, in order to improve the PFC capabilities of these applications, several topologies have been proposed in the literature to integrate the PFC stage in the inverter [21][22][23][24][25][26][27][28].…”