High conversion efficiency non-contact charger

Abstract

The non-contact type charging set is composed of two parts: charger and portable device. The charger converts electric energy to an alternating magnetic field in fixing frequency. Using inductance to cut magnetic line of the alternating magnetic field, the portable device converts magnetic energy to electric energy to provide charging voltage for inner batteries. Omitting charging electrode, the invention solves inherent defect. Improving magnetic leakage, hysteresis loss and coil loss, the invention selects forms of primary and secondary oscillating circuits, and specific connection method so as to reach target of safe and high efficiency. The invention is applicable to non-contact type charging set of hand held computer key with guiding against five operations, and PDA key.

Description

technical field [0001] The invention relates to the technical field of anti-misoperation locking of power systems, in particular to a non-contact charging device applied to hand-held computer keys and PDA keys with five anti-functions. Background technique [0002] At present, in the existing microcomputer anti-misoperation locking device, a smart key (commonly known as a computer key) with five anti-functions is generally used to cooperate with a mechanical lock to complete the anti-misoperation locking function; the computer key is a hand-held portable electronic device , The computer key is powered by a built-in battery. In order to supplement the power of the battery, a charger needs to be used to charge the battery. The battery charging method of computer keys and other portable electronic devices generally uses conductive materials to transmit power to the battery. This method is called contact charging, see figure 1 It is the composition principle diagram of this kin...

AI Technical Summary

Problems solved by technology

The electric energy is conducted to the battery or the power management unit in the portable device through the conductive contact. The electric energy transmission using the conductive contact is characterized by high efficiency, and the electric energy consumed in the transmission link is almost equal to zero. However, due to the use of the conductive contact, in In use, the charging contacts are easily damaged or the metal surface is oxidized, which leads to the inability to charge effectively

For this problem, a large number of designers have designed and tried many methods to make a series of improvements to the charging contact, such as plating the contact with some conductive materials with stable molecular structure, such as: silver, copper phosphide, beryllium Copper alloy, etc. Among them, beryllium copper alloy is currently an ideal conductive contact material. It has the characteristics of high conductivity, high elasticity, high hardness and strength, but the use of beryllium copper alloy still cannot fundamentally solve the problem of conductive contact wear and metal Problems caused by surface oxidation, and the price of beryllium copper alloy is relatively high, mainly used in high-end products

In addition, because the contacts of the charging source are exposed to the outside, the contacts are easily short-circuited, so the charger must provide a very sensitive over-current detection mechanism. When the contacts are short-circuited, the internal power circuit should be cut off, otherwise the Excessive current can easily cause permanent damage to the equipment, and may even cause damage to other properties; in addition, there are also non-contact charging devices, which mainly use ultrasonic waves or electromagnetic waves for energy transmission, but their biggest disadvantage is energy conversion efficiency. Low

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