Method and apparatus for simplifying the control of a switch
First Claim
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1. A circuit, comprising:
- a high side switch to be coupled between an input and a load; and
a control circuit coupled to the high side switch, the control circuit adapted to control the high side switch as a function of a voltage across the high side switch, wherein the control circuit is adapted to turn the high side switch on for an on time period when the control circuit senses the voltage across the high side switch crosses below a first threshold while the high side switch is off.
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Abstract
A technique for simplifying the control of a switch is presented. In one embodiment, a method of controlling a switch as a function of the voltage across the switch is presented. In one embodiment a method of controlling a switch as a function of the slope of the voltage across the switch is present. In one embodiment a switching is switched on for an on time period that is substantially fixed in response to a voltage across the switch while the switch is off. In one embodiment a switch is switched on for an on time period that is substantially fixed in response to the slope of the voltage across the switch while the switch is off.
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Citations
66 Claims
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1. A circuit, comprising:
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a high side switch to be coupled between an input and a load; and a control circuit coupled to the high side switch, the control circuit adapted to control the high side switch as a function of a voltage across the high side switch, wherein the control circuit is adapted to turn the high side switch on for an on time period when the control circuit senses the voltage across the high side switch crosses below a first threshold while the high side switch is off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A half bridge circuit, comprising:
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a low side switch; a high side switch coupled to the low side switch; a low side capacitor coupled to the low side switch; a high side capacitor coupled to the low side capacitor and the high side switch; and a load connected between a junction between the low side switch and high side switch and a junction between the low side capacitor and the high side capacitor, wherein the high side switch is adapted to be turned on for a high side on time period as a function of a voltage across the high side switch in response to the low side switch turning off, wherein the high side switch is adapted to be turned on for the high side on time period when the voltage across the high side switch crosses below a first threshold while the high side switch is off. - View Dependent Claims (48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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49. The circuit of 48 wherein the high side on time period and the low side on time period are substantially fixed.
Specification