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A self-adaptive bjt driving circuit

A drive circuit, self-adaptive technology, applied in the direction of circuits, electrical components, output power conversion devices, etc., can solve problems affecting system efficiency, drive current affects system efficiency, and BJT conduction resistance is large, so as to avoid efficiency problems Effect

Active Publication Date: 2020-07-03
SHENZHEN CHIP HOPE MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One kind of problem is that if the drive current is set larger, when the output power is small, the excessive drive current will affect the system efficiency; another problem is that if the drive current is set small, in the application of high output power, it will be Insufficient driving current leads to large BJT on-resistance, which also affects system efficiency
In order to overcome the defects existing in the prior art and solve the efficiency problem, the present invention provides an implementation method of an adaptive BJT drive circuit, which can dynamically adjust the drive current of the BJT by sampling the size of the CE junction current of the NPN1 triode, thereby effectively Avoid the efficiency problems of traditional BJT drive circuits

Method used

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  • A self-adaptive bjt driving circuit
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  • A self-adaptive bjt driving circuit

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 A kind of self-adaptive BJT drive circuit shown, comprises a transformer or an inductance 1, a power bipolar transistor 2, a sampling circuit 3, a drive circuit 4, the collector 21 of described power bipolar transistor 2 and The transformer or inductance 1 is connected, the emitter 22 is connected to the sampling circuit 3, the base 23 is connected to the driving circuit 4, the sampling circuit 3 and the driving circuit 4 are connected to each other, and the sampling circuit 3 is used for sampling the power flowing through the bipolar The current of the CE junction of the triode.

[0024] When the power bipolar transistor is turned on in saturation, the sampling circuit samples the current flowing in the power bipolar transistor as the current peak value of the CE junction of the power bipolar transistor.

[0025] figure 2 I...

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Abstract

The invention discloses an adaptive BJT driving circuit, which is characterized in that it comprises a transformer or an inductor, a power bipolar transistor, a sampling circuit, a driving circuit, the collector of the power bipolar transistor and The transformer or inductance is connected, the emitter is connected with the sampling circuit, the base is connected with the driving circuit, the sampling circuit and the driving circuit are connected to each other, and the sampling circuit is used for sampling the current flowing through the CE junction of the power bipolar transistor. The invention provides an implementation method of an adaptive BJT drive circuit, which can dynamically adjust the drive current of the BJT by sampling the CE junction current of the NPN1 triode, thereby effectively avoiding the efficiency problem of the traditional BJT drive circuit.

Description

[technical field] [0001] The invention relates to a BJT driving circuit, in particular to an adaptive BJT driving circuit. [Background technique] [0002] At present, the traditional BJT drive circuit has a fixed drive current, which will cause problems in applications with a large range of output power changes. One kind of problem is that if the drive current is set larger, when the output power is small, the excessive drive current will affect the system efficiency; another problem is that if the drive current is set small, in the application of high output power, it will be Insufficient driving current leads to large BJT on-resistance, which also affects system efficiency. In order to overcome the defects existing in the prior art and solve the efficiency problem, the present invention provides an implementation method of an adaptive BJT drive circuit, which can dynamically adjust the drive current of the BJT by sampling the size of the CE junction current of the NPN1 tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H03K17/60
CPCH02M1/08H03K17/60H02M1/0009
Inventor 赵鑫宗强刘准吴寿化管磊
Owner SHENZHEN CHIP HOPE MICRO ELECTRONICS LTD