×

Ballasting network with integral trap

  • US 5,477,112 A
  • Filed: 04/27/1993
  • Issued: 12/19/1995
  • Est. Priority Date: 04/27/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A ballast circuit, comprising:

  • an alternating current (AC) power source (110) including an output switch transistor (204, 224, 244,

         264) for operating at a first frequency;

    at least one parallel-resonant trap (120, 276,

         278) connected to be driven by said transistor in the AC power source (110) and including a first capacitor means (132,292,296) and a first inductor means (130, 290,

         294) connected in parallel providing for frequency resonance at a second frequency which is slightly higher in frequency thatn an odd harmonic of said first frequency, wherein said output switch transistor switches at one of a zero-voltage point and a zero-current point according to the relationship of said first frequency to said second frequency; and

    a negative-resistance load (102) connected with an impedance transforming network (122) in series with an AC power source (110) and the at least one parallel-resonant trap (120, 276,

         278), said impedance transformer network (122) including-a second inductor means (420) connected to said at least one parallel-resonant trap (120), third inductor means (460), second capacitor means (366), and third capacitor means (370) connected in series with said third inductor means (460) and said second capacitor means (366) across said second inductor means (420), said negative-resistance load (102) being connected across said third capacitor means (370).

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