Inductively coupled AC power transfer

A technology of alternating current and induced voltage, applied in transmission systems, near-field transmission systems, conversion of AC power input to AC power output, etc., can solve problems such as low efficiency

Active Publication Date: 2011-09-28
AUCKLAND UNISERVICES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is significantly less efficient than techniques that go directly from the AC input to a controlled AC output at the same frequency

Method used

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Examples

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Embodiment Construction

[0031] Figure 1 is a well-known diagram in the power system and is used to describe how electrical energy is transferred from a generator to another generator or load. The first generator has an output voltage V 1 , And through the inductance L 1 Connect to the second voltage V 2 . If v 1 And V 2 The phase angle between is α, then the transmission power is

[0032] P = V 1 V 2 sin ( α ) X

[0033] Where X is the inductance L 1 Reactance at operating frequency. This is a general formula represented by common symbols in power system analysis.

[0034] In the IPT system, the diagram can be interpreted slightly differently as shown in the circuit of Figure 2. In this case, V 1 Is the pickup coil L by the current flowing through the IPT track 1 The voltage induced in. Therefore, V 1 =jωMI, where I is the rail current, V 2 Now it is the voltage on the tuning capacitor C, and it is the resonant voltage in the IPT system. L 1 And C form a parallel res...

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Abstract

An Inductive Power Transfer System pickup provides a controlled AC power supply by controlled variation of the phase angle between the pickup coil induced voltage (jwMI) and the tuning capacitor C voltage. The phase angle can be varied by maintaining the tuning capacitor C voltage substantially constant for a selected time period. Switches S1 and S2 may be used to clamp the tuning capacitor C voltage at substantially zero volts during the selected time period. Switch S1 can be operated to prevent a rise in positive voltage across the tuning capacitor, and switch S2 can be used to prevent the voltage across the tuning capacitor from going negative.

Description

Technical field [0001] The present invention relates to inductive power transfer (IPT), and specifically but not only to applications that provide AC power. The invention can also be used to provide DC power. Background technique [0002] IPT systems are now widely used in industry and other fields to couple electrical energy from one frame of reference to another without physical contact. The specification of US Patent 5,293,308 describes an example of such a system, the content of which is incorporated herein by reference. Whenever such a system is used, the method of controlling the transmitted electric energy always includes a rectification stage, so that the actual output from the IPT system is a controlled DC voltage that may be connected to the user's load. For example, if the user needs AC power, the IPT system will be used to drive the inverter, and the inverter's output will be used to drive the user's load. In these cases, there are several power transmission stages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/00H02M5/458
CPCH02J5/005H02M3/33576H02J50/12Y02T10/70Y02T10/7072Y02T90/14H03J3/22H04B5/0093H04B5/0037H04B5/0075
Inventor J·T·博伊斯
Owner AUCKLAND UNISERVICES LTD
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