Wireless Power Wiki

User Tools

Site Tools

Trace:
ipt

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision		Previous revision
ipt [2025/06/04 16:52] – created npipt [2025/06/09 12:42] (current) – np
Line 6: Line 6:
  
 There are two main types of IPT systems. One without resonance and one with. Above figure shows the basic schematic of a resonant IPT system. At the primary circuit, the sinusoidal AC current from the grid is first rectified into a stable DC current and then converted back to AC but with a higher frequency thanks to a high-frequency inverter. The high-frequency AC current then enters a primary resonant circuit consisting of a compensation network and a primary coil. This coil generates an alternating magnetic field, which is received by the coil of the secondary circuit. This induces an alternating current in the secondary circuit, which can then go through different filters or rectifiers depending on the load. There are two main types of IPT systems. One without resonance and one with. Above figure shows the basic schematic of a resonant IPT system. At the primary circuit, the sinusoidal AC current from the grid is first rectified into a stable DC current and then converted back to AC but with a higher frequency thanks to a high-frequency inverter. The high-frequency AC current then enters a primary resonant circuit consisting of a compensation network and a primary coil. This coil generates an alternating magnetic field, which is received by the coil of the secondary circuit. This induces an alternating current in the secondary circuit, which can then go through different filters or rectifiers depending on the load.
 +
 +The “connection quality” between the coils is called the coupling coefficient k and ranges between 0 and 1. Where 0 means no coupling and 1 perfect coupling. It characterizes the ratio of the flux linking the coils of a pad to the total flux generated by the opposite pad. 
  
 $$ $$
 k = \frac{M}{\sqrt{L_1 L_2}} k = \frac{M}{\sqrt{L_1 L_2}}
 $$ $$
 +
 +The maximum achievable efficiency can be mathematically expressed by the equation below:
 +
 +$$
 +\eta = \frac{k^2 Q_P Q_S}{\left(1 + \sqrt{1 + k^2 Q_P Q_S}\right)^2}
 +$$
 +
 +Q<sub>p</sub> and Q<sub>s</sub> are the quality factors for the primary and secondary sides, respectively. They are determined by the (parasitic) resistances and self-inductances of the coil where ω<sub>0</sub> is the angular resonant frequency. R represents the total resistance of the coils (primary or secondary) and is the sum of three components: R<sub>DC</sub>, which is the DC resistance, R<sub>skin</sub>, which accounts for the skin  effect loss, and R<sub>prox</sub>, which represents the proximity effect loss.
 +
 +$$
 +Q_{P/S} = \frac{\omega_0 L_{P/S}}{R_{P/S}}
 +$$
 +
 +To further design the IPT system, the [[Type of coils]] and [[Shielding techniques]] must be determined.
  
ipt.1749055921.txt.gz · Last modified: by np