CIRCUIT FOR GENERATING TRIANGULAR WAVEFORM HAVING RELATIVELY SHORT LINEAR RISE TIME AND SUBSTANTIALLY LONG LINEAR FALL TIME
First Claim
1. A circuit, comprising:
- a pulse transformer having primary and secondary windings, the primary winding having first and second terminals and a center terminal to which is coupled a DC source, the secondary winding having third and fourth terminals;
a first transistor coupled between the second terminal of the primary winding and a ground;
a first and a second resistor forming a voltage divider between the first terminal of the primary winding and the ground, the voltage divider having a tap node coupled to a base junction of the first transistor;
a second transistor in series with a third resistor coupled between the third and fourth terminals of the secondary winding and the ground; and
an R-C network formed by a fourth and a fifth resistor and a capacitor, the R-C network coupled to a base junction of the second transistor to cause a slow, tapered linear pinch off of the second transistor'"'"'s conductance to enable the circuit to output a triangular waveform, the R-C network coupled to the third and fourth terminals of the secondary winding via a first and a second diode, respectively.
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Accused Products
Abstract
A circuit includes a pulse transformer having primary and secondary windings. An oscillating waveform is applied to the primary winding to induce an oscillating waveform at the secondary winding. A transistor in series with a first resistor is coupled between the secondary winding and the ground. An R-C network formed by a second and a third resistor and a capacitor is coupled to a base junction of the transistor. The R-C network causes a slow, tapered linear pinch off of the transistor'"'"'s conductance to enable the circuit to output a triangular waveform, which is characterized by a relatively short linear rise time followed by a substantially long linear fall time. The R-C network is coupled to the secondary winding via a first and a second diode, respectively.
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Citations
22 Claims
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1. A circuit, comprising:
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a pulse transformer having primary and secondary windings, the primary winding having first and second terminals and a center terminal to which is coupled a DC source, the secondary winding having third and fourth terminals; a first transistor coupled between the second terminal of the primary winding and a ground; a first and a second resistor forming a voltage divider between the first terminal of the primary winding and the ground, the voltage divider having a tap node coupled to a base junction of the first transistor; a second transistor in series with a third resistor coupled between the third and fourth terminals of the secondary winding and the ground; and an R-C network formed by a fourth and a fifth resistor and a capacitor, the R-C network coupled to a base junction of the second transistor to cause a slow, tapered linear pinch off of the second transistor'"'"'s conductance to enable the circuit to output a triangular waveform, the R-C network coupled to the third and fourth terminals of the secondary winding via a first and a second diode, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit, comprising:
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a pulse transformer having primary and secondary windings, the primary winding to which is applied an oscillating waveform; and a triangular waveform generating circuit coupled to the secondary winding, the triangular waveform generating circuit being responsive to the oscillating waveform at the secondary winding and outputting a triangular waveform characterized by a relatively short linear rise time followed by a substantially long linear fall time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A battery charging circuit, comprising:
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a pulse transformer having primary and secondary windings, the primary winding to which is applied an oscillating waveform; a transistor in series with a first resistor coupled between the secondary winding and the ground; and an R-C network formed by a second and a third resistor and a capacitor, the R-C network coupled to a base junction of the transistor to cause a slow, tapered linear pinch off of the transistor'"'"'s conductance to enable the circuit to output a triangular waveform characterized by a relatively short linear rise time followed by a substantially long linear fall time, the R-C network coupled to the secondary winding via a first and a second diode, respectively, wherein the triangular waveform is superimposed on a DC bias signal and the resulting waveform is applied to a battery. - View Dependent Claims (20, 21, 22)
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Specification