IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0363260
(2006-02-28)
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발명자
/ 주소 |
- Velhner,Aleks
- Allyn,Neil Garfield
- Moreau,Terry
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출원인 / 주소 |
- Teleflex Canada Incorporated
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인용정보 |
피인용 횟수 :
4 인용 특허 :
14 |
초록
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There is provided an energy discharge apparatus for dissipating a quantity of stored magnetic energy in a generator field coil of a brushless generator. The apparatus includes an exciter regulator responsive to an output signal of the generator and which provides an exciter field signal, and an exci
There is provided an energy discharge apparatus for dissipating a quantity of stored magnetic energy in a generator field coil of a brushless generator. The apparatus includes an exciter regulator responsive to an output signal of the generator and which provides an exciter field signal, and an exciter field coil responsive to the exciter field signal and which provides an exciter magnetic field, and an exciter armature coil responsive to the exciter magnetic field and which provides an exciter armature signal. The apparatus further includes a control circuit responsive to the exciter armature signal, and a variable impedance in series with the generator field coil and responsive to the control circuit. The variable impedance serves to dissipate the quantity of stored magnetic energy. In another embodiment the apparatus includes a positive feedback circuit responsive to the exciter armature signal and operable to dissipate the quantity of stored magnetic energy. The positive feedback circuit is further responsive to the dissipation of the quantity of stored magnetic energy such that a rate of dissipation increases until the quantity of stored magnetic energy substantially reduces to an ineffective amount.
대표청구항
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What is claimed is: 1. An energy discharge apparatus for dissipating a quantity of stored magnetic energy in a coil, the coil having a current signal, the apparatus comprising: a variable impedance device having a first device terminal, a second device terminal and a third device terminal, the devi
What is claimed is: 1. An energy discharge apparatus for dissipating a quantity of stored magnetic energy in a coil, the coil having a current signal, the apparatus comprising: a variable impedance device having a first device terminal, a second device terminal and a third device terminal, the device being in series with the coil with the second device terminal being connected to a first coil terminal, a first voltage signal being between a second coil terminal and the third device terminal, a second voltage signal being between the second and the third device terminals, a third voltage signal being between the first and the third device terminals; a first control means for adjusting the variable impedance device, the first control means being connected to the first device terminal, the third device terminal and the second coil terminal, the first control means being responsive to the first voltage signal and being operable to adjust the third voltage signal, the third voltage signal being operable to adjust an impedance between the second and the third device terminals; and a second control means for rapidly adjusting the variable impedance device, the second control means being connected between the first device terminal, the second device terminal and the third device terminal, the second control means being responsive to the second voltage signal and being operable to decrease the third voltage signal thereby increasing the impedance. 2. An energy discharge apparatus for dissipating a quantity ofstored magnetic energy in a coil, the coil having a voitage signal and a current signal, the apparatus comprising: a variable impedance means for dissipating the quantity of stored magnetic energy, the variable impedance being in series with the coil and including a transistor; a variable impedance control means for adjusting the variable impedance means, the variable impedance control means being responsive to the voltage signal, a substantial decrease in the voltage signal causing an increase in the variable impedance, the increase in the variable impedance causing a decrease in the current signal, the decrease in the current signal causing a back EMF in the coil, the back EMF in the coil being applied across the variable impedance and being operable to counteract the decrease in the current signal, the variable impedance and the back EMF serving to dissipate the quantity of stored magnetic energy at a rate of dissipation; and a dissipation accelerating means for rapidly adjusting the variable impedance means, the dissipation accelerating means being responsive to the back EMF and serving to further increase the variable impedance and having a positive feedback effect, the further increase in the variable impedance consequently increasing the back EMF and the rate of dissipation, the dissipation accelerating means continuously operable until the quantity of stored magnetic energy is substantially reduced to zero. 3. The energy discharge apparatus as claimed in claim 2, wherein the variable impedance means includes a transistor. 4. The energy discharge apparatus as claimed in claim 3, wherein the transistor is a MOSFET transistor. 5. The energy discharge apparatus as claimed in claim 3, wherein the transistor is a bipolar transistor. 6. The energy discharge apparatus as claimed in claim 2, wherein the variable impedance control means includes a first resistor, a second resistor and a capacitor, the first resistor being connected in parallel with the capacitor and being connected in series with the second resistor. 7. The energy discharge apparatus as claimed in claim 6, wherein the first variable impedance control means further includes a zener diode having an anode and a cathode, the anode being responsive to the variable impedance and the cathode being responsive to the second resistor. 8. The energy discharge apparatus as claimed in claim 2, wherein the dissipation accelerating means includes a transistor, a first resistor and a second resistor, the first and second resistors being responsive to a voltage across the variable impedance, the transistor being responsive to a voltage divided by the first and second resistors and to the variable impedance control means. 9. The energy discharge apparatus as claimed in claim 8, wherein the transistor is a MOSFET transistor. 10. The energy discharge apparatus as claimed in claim 8, wherein the transistor is a bipolar transistor.
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