×

Charger for hand-held rechargeable electric apparatus with switch for reduced magnetic field

  • US 5,536,979 A
  • Filed: 06/30/1994
  • Issued: 07/16/1996
  • Est. Priority Date: 06/30/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system including a first electric circuit for transferring AC electric power to a second electric circuit which is mounted within a portable device such that the second electric circuit and the device are separable from the first electric circuit, wherein there is no electrical connection between the first electric circuit and the second electric circuit, wherein the first circuit comprises a first coil coupled around a first magnetic core wherein the first coil is coupled to receive an AC power signal for forming a magnetic field and wherein the second circuit comprises a second magnetic coil coupled around a second magnetic core for receiving the magnetic field, wherein the first magnetic core and the second magnetic core are substantially aligned for forming a completed magnetic circuit for reducing stray magnetic fluxes, the system further comprising means for deactivating the AC power signal to the first coil when the second magnetic core is removed from alignment wherein the means for deactivating comprises a circuit for detecting whether the second magnetic core is removed from alignment by monitoring a response to the AC power signal.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×