Wireless Power Transfer With Automatic Feedback Control of Load Resistance Transformation

Reconfigurable Wireless Power Transfer Systems With High Energy Efficiency Over Wide Load Range

“…This operation automatically guarantees the maximum energy efficiency for the WPT system. Based on this concept, the search process in [12] is replaced with a feedback control in order to speed up the dynamic response in [13]. Another approach for MEET based on the uses of a boost converter and a wireless feedback system has also been proposed in [14].…”

An Overview of Regulation Topologies in Resonant Wireless Power Transfer Systems for Consumer Electronics or Bio-Implants

“…To achieve a high VCE, a switching-based current-mode (SCM) regulating technique was proposed in [28][29][30][31]. This technique differs from voltage-mode ones by firstly storing the received energy in the RX LC resonant tank (as the resonant phase) and then delivering it to the load (charging phase).…”

“…Therefore, the regulation schemes investigated in the previous works can also be categorized into two types: RX and TX regulation. As illustrated in Figure 3, RX regulation includes post-stage regulation (achieved by a cascading low dropout regulator (LDO [12][13][14][15] or a DC-DC converter [16][17][18][19][20]) and one-stage regulation, including active diode conduction time control [21][22][23], reconfigurable regulating rectification [24][25][26][27], and switching-based current-mode regulation [28][29][30][31]. On the other hand, TX regulation can be achieved by PA supply voltage control [32,33], resonant frequency control [34], PA power switch duty cycle control [35][36][37][38][39][40], and vector power summing control [41,42].…”

Wireless Power Transfer System Architectures for Portable or Implantable Applications

“…In many state-of-the-art designs, novel system level output voltage regulation schemes were proposed to eliminate the need for a post-conversion stage, and consequently reduce the system complexity and increase the maximum achievable total efficiency [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. These schemes are discussed in the following sub-sections.…”

“…Besides the above-mentioned primary side power control and reconfigurable and/or regulating rectifiers topologies for output regulation, pre-rectifier regulation topology was proposed in [20] and [21], as demonstrated in Figure 11. Similar to the previous load modulation schemes that switch rectifier modes with PWM signals, the pre-rectifier regulation scheme (named as Q-modulation in [20]) tried to modulate the load impedance seen from the resonator, and thus to achieve output regulation.…”