Abstract: The present application relates to electronics and in particular to switch drive circuits and more particularly to galvanically isolated switch circuits with power transfer from the switch driver input side to the switch side. More specifically, the present application provides a switch drive circuit using a single transformer to transfer control signals to a secondary side for control of the switch along with power to a secondary side circuit to drive the switch in response to the control signals. By detecting the control signal first before drawing current, the effects of leakage inductance in the transformer are reduced.

Abstract: Switch drive circuits include galvanically isolated switch circuits with power transfer from the switch driver input side to the switch side. A switch drive circuit uses a single transformer to transfer control signals to a secondary side for control of the switch along with power to a secondary side circuit to drive the switch in response to the control signals. By detecting the control signal first before drawing current, the effects of leakage inductance in the transformer are reduced.

Abstract: An isolated gate driver includes a transformer including primary and secondary windings, a synchronous rectifier connected between the secondary winding and an output terminal of the isolated gate driver, a first switch including a first terminal connected to a supply voltage, a second switch including a first terminal connected to the supply voltage, a first damping resistance connected between a first terminal of the secondary winding and a second terminal of the first switch, a second damping resistance connected between a second terminal of the secondary winding and a second terminal of the second switch, a first inverter including an input connected to the first terminal of the secondary winding and an output connected to a gate terminal of the first switch, and a second inverter including an input connected to the second terminal of the secondary winding and an output connected to a gate terminal of the second switch.

Abstract: The present application relates to electronics and in particular to switch drive circuits and more particularly to galvanically isolated switch circuits with power transfer from the switch driver input side to the switch side. More specifically, the present application provides a switch drive circuit using a single transformer to transfer control signals to a secondary side for control of the switch along with power to a secondary side circuit to drive the switch in response to the control signals. By detecting the control signal first before drawing current, the effects of leakage inductance in the transformer are reduced.

Abstract: The present application relates to electronics and in particular to switch drive circuits and more particularly to galvanically isolated switch circuits with power transfer from the switch driver input side to the switch side. More specifically, the present application provides a switch drive circuit using a single transformer to transfer control signals to a secondary side for control of the switch along with power to a secondary side circuit to drive the switch in response to the control signals. By detecting the control signal first before drawing current, the effects of leakage inductance in the transformer are reduced.

Abstract: The present application relates to an isolated drive circuit, of the type commonly employed as high side drivers, for providing a drive signal to a semiconductor switch. The isolated drive circuit comprises a transformer with primary and secondary windings. The circuit further comprises a primary side circuit having a plurality of switches arranged in a bridge configuration with the primary winding positioned across the output of the bridge and a secondary side circuit connected to the secondary winding of the transformer and having a drive circuit output for providing a drive signal to the semiconductor switch. The advantage of this approach is that the entire circuit can be constructed as a module for use as a single component on a circuit board without requiring additional external components.

Abstract: The present application relates to electronics and in particular to switch drive circuits and more particularly to galvanically isolated switch circuits with power transfer from the switch driver input side to the switch side. More specifically, the present application provides a switch drive circuit using a single transformer to transfer control signals to a secondary side for control of the switch along with power to a secondary side circuit to drive the switch in response to the control signals. By detecting the control signal first before drawing current, the effects of leakage inductance in the transformer are reduced.

Abstract: The present application relates to an isolated drive circuit, of the type commonly employed as high side drivers, for providing a drive signal to a semiconductor switch. The isolated drive circuit comprises a transformer with primary and secondary windings. The circuit further comprises a primary side circuit having a plurality of switches arranged in a bridge configuration with the primary winding positioned across the output of the bridge and a secondary side circuit connected to the secondary winding of the transformer and having a drive circuit output for providing a drive signal to the semiconductor switch. The advantage of this approach is that the entire circuit can be constructed as a module for use as a single component on a circuit board without requiring additional external components.

Abstract: An over-current protection circuit shuts off current to an optical transmitter, such as a laser diode, if a detected current to the optical transmitter exceeds a threshold. A circuit element functions to both detect the current and switch off the current if the detected current exceeds a threshold. The circuit element may be a PMOS transistor.

Abstract: A converter comprises a first switch (102) for connecting an input DC voltage to a primary winding (103) of a transformer (104), a second switch (105) for connecting a reset voltage to the transformer, and first and second synchronous rectifiers (109, 110) within a filter circuit (108) for receiving an output voltage waveform from a secondary winding (107) of the transformer and generating therefrom a DC output voltage. The synchronous rectifiers are controlled by the secondary winding. A first one of the synchronous rectifiers (109) couples the secondary winding to an output terminal of the power supply to provide output power during part of the switching cycle. The second synchronous rectifier (110) serves as a “flywheel” for providing load current during a second part of the switching cycle when the first synchronous rectifier is off. The timing of the first and second switches is arranged to prevent simultaneous conduction of the synchronous rectifiers.

Abstract: A converter comprises a first switch (102) for connecting an input DC voltage to a primary winding (103) of a transformer (104), a second switch (105) for connecting a reset voltage to the transformer, and first and second synchronous rectifiers (109, 110) within a filter circuit (108) for receiving an output voltage waveform from a secondary winding (107) of the transformer and generating therefrom a DC output voltage. The synchronous rectifiers are controlled by the secondary winding. A first one of the synchronous rectifiers (109) couples the secondary winding to an output terminal of the power supply to provide output power during part of the switching cycle. The second synchronous rectifier (110) serves as a "flywheel" for providing load current during a second part of the switching cycle when the first synchronous rectifier is off. The timing of the first and second switches is arranged to prevent simultaneous conduction of the synchronous rectifiers.