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Self-oscillating driver with soft start circuit

a driver and soft-start technology, applied in the field of self-oscillating drivers, can solve problems such as unwanted circuit failures and component characteristics deterioration

Inactive Publication Date: 2008-02-21
INTERNATIONAL RECTIFIER COEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a driver control that is self-oscillating and responsive to overcurrent fault conditions. The driver circuit includes dead time between switching pulses that is programmable by external components and level shift circuitry with DV / DT protection. The driver circuit also incorporates a shutdown mode to permit the load time to recover from an overcurrent condition. The technical effects of the present invention include component and circuitry protection, responses to undervoltage or overcurrent conditions, and a soft start feature to avoid potentially damaging transients at turn-on."

Problems solved by technology

This type of immediate startup operation can have an impact on the ruggedness of the full or half-bridge switching components, that is, numerous startup conditions of this type can result in deterioration of the characteristics of the components and lead to unwanted circuit failures.

Method used

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  • Self-oscillating driver with soft start circuit
  • Self-oscillating driver with soft start circuit
  • Self-oscillating driver with soft start circuit

Examples

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Embodiment Construction

[0025] Referring now to FIGS. 1-9, various application circuits using drivers in accordance with the present invention are illustrated, in addition to block diagrams of different embodiments of the driver circuits. Referring to FIG. 1, a full-bridge application circuit 18 is illustrated with a full-bridge driver 19 in accordance with the present invention. Full-bridge driver 19 provides outputs for each of the switches M1-M4 in full-bridge circuit 18. In addition, driver circuit 19 provides independent reference connections VS1, VS2, for each of the half-bridge circuits that make up full-bridge circuit 18.

[0026] Driver circuit 19 is a self-oscillating full-bridge primary driver operable at high voltage, e.g., 200 volts, and high speed, e.g., up to 1 MHz. Driver circuit 19 also provides dead time operation and coordination, with dead time values of less than 20 ns. Driver circuit 19 also provides a number of fault protections, including undervoltage protection, soft start protection...

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Abstract

A method for providing a soft start operation for a transistor driver circuit, comprising providing a saw tooth waveform from an oscillator at a given frequency; comparing the saw tooth waveform to a reference value; and modifying the saw tooth waveform as a result of the comparison to produce pulses of increased length when the reference value is below a value of the saw tooth waveform.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This is a divisional of U.S. patent application Ser. No. 10 / 821,807 filed Apr. 26, 2004 entitled SELF-OSCILLATING DRIVER WITH SOFT START CIRCUIT, which application is based on and claims the benefit of U.S. Provisional Application No. 60 / 465,250, filed Apr. 24, 2003, entitled HALF BRIDGE DRIVER, to which a claim of priority is hereby made, the entire disclosures of which are hereby incorporated by reference.BACKGROUND [0002] 1. Field of the Invention [0003] The present invention relates generally to self-oscillating drivers, and relates more particularly to self-oscillating drivers with fault protections. [0004] 2. Description of Related Art [0005] Transistor drivers are used in a number of applications including full-bridge and half-bridge switching arrangements used to drive a load. For example, full-bridge circuits are used to operate DC-Bus converters, HID lamps and other well known industrial applications. Half-bridge drivers are al...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03K3/017H02H3/00H02M1/00H02M1/096H02M1/32H02M1/36H02M3/335
CPCH02M1/096H02M1/32Y02B70/1475H02M3/33592H02M1/36Y02B70/10
Inventor CHENG, XIAO-CHANGABDOULIN, EDGAR
Owner INTERNATIONAL RECTIFIER COEP