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Integrated switch with RF transformer control

A technology for controlling circuits and oscillating circuits, applied in circuits, output power conversion devices, transformers/inductor coils/windings/connections, etc., can solve problems such as bulky and expensive

Inactive Publication Date: 2005-11-16
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Capacitors must hold high voltages and are therefore also bulky and expensive

Method used

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  • Integrated switch with RF transformer control
  • Integrated switch with RF transformer control
  • Integrated switch with RF transformer control

Examples

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Embodiment Construction

[0029] The same components in different drawings are marked with the same symbols. For the sake of clarity, only that which is necessary for understanding the invention is shown in the drawings and will be described below. In particular, the circuitry for power switch control is not shown, as that is not the object of the invention. Also not shown are those possible circuits for providing the operating set point at the control circuit inlet to the isolation barrier.

[0030] FIG. 3 shows an embodiment of a control circuit 10 of a power switch K with an electrical isolation barrier (barrier IB). The content of Figure 3 should be compared with that of traditional Figures 1 and 2.

[0031] According to the invention, a very high frequency (at least tens of MHz) transformer 11 is used, which has a primary winding 12 controlled by a circuit 13 (OSC), a secondary winding 14 for controlling the power at the outlet of the isolation barrier IB Switch K. As mentioned above, the swit...

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Abstract

The invention concerns a control circuit for controlling a power switch by means of a galvanic insulation transformer, the transformer being produced in the form of planar conductive windings on an insulating substrate (20) whereon are integrated passive components constituting a high frequency excitation oscillating circuit for a primary winding of the transformer, the transformer substrate being directly mounted on a wafer (24) whereon is mounted a circuit chip (40) integrating the power switch.

Description

technical field [0001] The present invention relates to power circuit control systems requiring electrical isolation between the control circuit and the power circuit. Such systems are commonly used to control loads powered by alternating current (A.C) sources. Galvanic isolation essentially serves to protect the control circuit and its users. Background technique [0002] Figure 1 shows a first embodiment of a conventional device for galvanic isolation between a control circuit and a power circuit. The device is a transformer T forming an isolation barrier IB, the transformer having a primary winding T1 connected to the two outputs of the control circuit 1 and a secondary winding T2 for controlling a power switch K. In the embodiment of FIG. 1, switch K is a silicon controlled rectifier connected between two ports 2 and 3 of a power circuit (not shown). The gate (cathode) of silicon controlled rectifier K is connected to one end of winding T2, and the other end of windin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/28
CPCH01F2029/143H01L2924/19011H01F27/2804Y10T307/937Y10T307/944
Inventor 法布莱斯·基顿罗伯斯·佩泽尼
Owner STMICROELECTRONICS SRL
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