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Biopolar power control

A controller and current control element technology, applied in the field of fluorescent lamp lighting ballasts and self-excited oscillation converters, can solve the problems of increasing the manufacturing cost and expensiveness of compact fluorescent lamps

Active Publication Date: 2011-02-16
REDISEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, field effect transistors are more expensive than bipolar junction transistors, which makes the application of field effect transistors increase the manufacturing cost of compact fluorescent lamps

Method used

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Examples

Experimental program
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Embodiment Construction

[0050] figure 2 The controller 26 according to the first embodiment of the present invention is shown. The controller 26 is connected to a control winding 28 , which is wound on the same iron core as that of the transformer composed of the load winding 14 and the excitation windings 18 , 20 . Typically, the turns ratios of the above-mentioned windings are 15:2:5:5, respectively. Controlling the windings 28 allows the controller to vary the current in the excitation windings 18 , 20 to control the switching of the bipolar junction transistors 4 and 6 .

[0051] The controller 26 has a control unit 30 for providing switching control signals to control the metal oxide semiconductor field effect transistors 32 , 34 , 36 and 38 . The control unit 30 is connected to the gate electrodes of the metal oxide semiconductor field effect transistors 32 , 34 , 36 and 38 . The metal-oxide-semiconductor field effect transistors 32, 34 and 36, 38 are N-channel metal-oxide-semiconductor fie...

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PUM

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Abstract

This invention relates to a circuit for controlling a power converter featuring BJTs, through use of a control winding on the transformer that provides the base drive for the BJTs. This controller can control the control winding current, thus modifying the commutating of the current or stopping the oscillations. It can provide unidirectional shorts to prevent commutation and can also provide an initial power pulse to control the start or operation of the power converter.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a self-excited oscillation converter (self-excited oscillation power converter). The present invention is particularly applicable but not limited to fluorescent lighting ballasts. Background technique [0002] Bipolar Junction Transistors (BJTs, Bipolar Junction Transistors) are often used as switches in Switched Mode Power Supplies (SMPSs) due to their low cost. Switch-mode power supplies using bipolar junction transistors are typically designed to self-oscillate with inductors and capacitors, requiring no external control of the switch-mode power supply on / off, except when it starts up. In the switching power supply, a transformer including a winding is connected in series with the load current of the bipolar junction transistor, and the base current of the bipolar junction transistor is provided through the secondary winding. The switch-mode power supply can be used as an electron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/00H05B41/00H02M7/537
CPCH02M7/537H05B41/2828Y02B20/186H05B41/2827Y02B70/1441Y02B20/00Y02B70/10H05B41/282H05B41/2824
Inventor 拉塞尔·雅克
Owner REDISEM