A combination voltage device of primary and secondary coils at the receiving end of wireless power
A wireless power and secondary coil technology, applied in circuit devices, electrical components, etc., can solve problems such as power consumption occupied by circuit space
Active Publication Date: 2021-10-22
SOUTHEAST UNIV
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Problems solved by technology
The form of the DC converter usually includes buck step-down circuit, boost step-up circuit, LDO linear voltage regulator, etc. For example, the receiving end of the conventional WPC Qi mobile phone wireless charging protocol is generally equipped with a step-down DC converter at the receiving end , so that the output voltage can be stabilized at the standard voltage of 5V, but the step-down circuit is responsible for the modulation of all electric energy, which will occupy a certain circuit space and generate electric energy loss
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[0028] The wireless power receiving end contains at least one main coil and at least one auxiliary coil, wherein the electric energy received by the main coil is not modulated to form an unmodulated main voltage after passing through the main resonant circuit and the main rectifier; the electric energy received by the auxiliary coil is passed through the auxiliary resonant circuit, The modulation of the secondary rectifier and the secondary DC converter forms a modulated secondary voltage. The unmodulated primary voltage and the modulated secondary voltage are connected in series to obtain a combined voltage, which is used as the output of the wireless power receiving end.
[0029] There are certain uncertainties in wireless power transmission. Factors such as the relative position and distance of the transmitting and receiving coils, and the magnitude of the load current will cause changes in the output voltage. Therefore, a DC converter is required to provide a stable output ...
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The invention discloses a primary and secondary coil combined voltage device at a wireless energy receiving end. The wireless energy receiving end includes at least one primary coil (1) and at least one secondary coil (2), and the electric energy received by the primary coil passes through a main resonant circuit (3 ) and the main rectifier (4), without modulation, an unmodulated main voltage (5) is formed; the electric energy received by the auxiliary coil is modulated by the auxiliary resonant circuit (6), the auxiliary rectifier (7) and the auxiliary DC converter (8) , forming a modulation secondary voltage (9). After the above-mentioned unmodulated main voltage and the modulated secondary voltage are connected in series, a stable joint voltage (10) is formed as the output of the wireless power receiving end. In the device of the present invention, only the electric energy on the auxiliary coil needs to be modulated by the DC converter, and the electric energy on the main coil does not need a converter and does not need to be modulated, which saves the volume and loss of the converter, so the total volume of the device of the present invention can be reduced and the circuit efficiency can be improved.
Description
technical field [0001] The invention relates to the field of wireless power transmission, in particular to a primary and secondary coil combined voltage device at a receiving end. Background technique [0002] Wireless power transfer is used in a wide range of applications, such as portable electronic devices, implanted body electronic devices, electric vehicles, and more. Wireless power transmission consists of a transmitting end and a receiving end, wherein the receiving end contains an electromagnetic coil for capturing electromagnetic energy. Due to certain uncertainties in the transmission of wireless energy, including factors such as the relative position and distance of the transmitting and receiving coils, as well as the load current, all of them will lead to changes in the reception of electromagnetic energy, so that the output voltage cannot be maintained at a constant value. Therefore, usually the receiving end needs to be equipped with a DC converter to achieve ...
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IPC IPC(8): H02J50/12H02J50/40H02J50/00
CPCH02J50/12H02J50/005H02J50/402
Inventor 王激尧徐炜秦岭胡友康
Owner SOUTHEAST UNIV