CN204906324U

CN204906324U - A high frequency power amplifier for transmitter or high -frequency heating apparatus

Info

Publication number: CN204906324U
Application number: CN201520690146.3U
Authority: CN
Inventors: 乔闹生
Original assignee: Hunan University of Arts and Science
Current assignee: Hunan University of Arts and Science
Priority date: 2015-11-06
Filing date: 2015-11-06
Publication date: 2015-12-23
Anticipated expiration: 2025-11-06

Abstract

The utility model provides a high frequency power amplifier for transmitter or high -frequency heating apparatus, includes: transistor, high -frequency transformer, resonant capacitor, bypass capacitor and DC power supply, wherein: transistor's emitter ground is the negative pole of power, alternating current signal source and a DC bias power has concatenated between transistor's base and ground, and this DC bias both ends of the power supply connects in parallel has couple bypass capacitor of alternating current signal short circuit, the elementary of high -frequency transformer and collecting electrode DC power supply concatenate between transistor's collecting electrode and ground, there is a resonant capacitor in that high -frequency transformer primary both ends are parallelly connected, there is a bypass capacitor in that collecting electrode DC power supply both ends are also parallelly connected, high -frequency transformer's the secondary signal output part that is, it has load resistance still to connect in parallel in these secondary coil both ends. This amplifier simple structure, transistor does not switch on when no signal input, and because of the output is connected with resonant capacitor and step up transformer, consequently the consumption is little at ordinary times, and output is big.

Description

A kind of high frequency power amplifier for transmitter or thermatron

Technical field

The utility model relates to a kind of high frequency power amplifier for transmitter or thermatron, belongs to electronic apparatus technical field.

Background technology

As everyone knows, all need to use high frequency power amplifier in transmitter or thermatron, and high frequency power amplifier in use all wishes that power output is the bigger the better, signal distortion after amplification is the smaller the better, in real work thing and be willing to be, when power output arrives greatly certain value, power stage is larger, distorted signals is also larger, the distortion factor how reducing high-frequency amplifier is the technical barrier of pendulum in face of electrical apparatus technology personnel, along with the develop rapidly of electronic technology, the task of amp circuit design is also more and more heavier, vast electrical apparatus technology personnel are just making great efforts research and development and experiment, actively strive for producing power output early large, the high frequency power amplifier that the distortion factor is little, to meet the needs of electronics industry develop rapidly development.

Summary of the invention

For overcoming the above-mentioned defect of existing Electronic Design production debugging method, the utility model provides a kind of high frequency power amplifier for transmitter or thermatron, in order to meet the need of work of vast electrical apparatus technology personnel, adapt to the new situations of electronics industry develop rapidly development.

For solving its technical problem, the design people is in long-term reality, by research and test of many times, finally find a kind of high frequency power amplifier that can be used for transmitter or thermatron, this amplifier comprises a transistor, a high frequency transformer, a resonant tank capacitor, two by-pass capacitors and two DC power supply, its feature is: the grounded emitter of transistor and the negative pole of power supply, alternating message source and a DC bias supplies is serially connected with between the base stage and ground of transistor, and these bias supply two ends are parallel with the by-pass capacitor to AC signal short circuit, the elementary of high frequency transformer and collector electrode DC power supply is serially connected with between the collector electrode and ground of transistor, a resonant capacitor is parallel with at high frequency transformer primary coil two ends, also a by-pass capacitor is parallel with at collector electrode DC power supply two ends, the secondary of high frequency transformer is signal output part, these secondary coil two ends are also parallel with load resistance.

Compared with prior art, the utility model has following features and progress:

1, transistor base stage of the present utility model is connected with the low pressure bias direct current power supply determining working point, makes it without the not admittance of transistor during input signal, in order to reduce use cost;

2, between the collector electrode and collector electrode DC power supply of transistor, the elementary of resonance transformer is serially connected with, by the resonant capacitor of described elementary two ends parallel connection, after the signal that transistor is exported obtains resonance, pass through the large secondary further amplification of step-up ratio again, maximum power stage can be obtained, as long as select suitable transistor and component parameters, just can both obtain maximum power output, and have and obtain distortion output signal at first.

3, this high-frequency amplifier is by testing and testing, and proves that this light high-frequency amplifier can adapt to the task of transmitter or thermatron, can be used for transmitter or high-frequency amplifier made by thermatron.

Accompanying drawing explanation

Fig. 1 is that this is suitable for novel circuit theory diagrams.

Wherein: Ui is signal source, Q1 is transistor, and T1 is high frequency transformer, and C1 is by-pass capacitor, and C2 is another by-pass capacitor, and C3 is resonant capacitor, and V1 is base bias DC power supply, and V2 is collector electrode DC power supply, and RL is load resistance.

Embodiment

Below in conjunction with embodiment, the utility model is further illustrated:

With reference to accompanying drawing, the high frequency power amplifier for transmitter or thermatron designed, comprises two DC power supply of transistor Q1, high frequency transformer T1, resonant capacitor C3, two by-pass capacitors C1, C2 and base bias DC power supply V1, collector electrode DC power supply V2, wherein: the nominal value of described high frequency transformer is T1N=1, LE=1e-05H, LM=0.0005H, RP=RS=0, the model of described transistor Q1 adopts 2N2222 or 3DG6, its grounded emitter and the negative pole of power supply, the DC bias supplies V1 that nominal value is an alternating message source Ui and 0.2V of 270mV/2MHz is serially connected with between the base stage and ground of this transistor, and these bias supply two ends are parallel with the by-pass capacitor C1 to AC signal short circuit, the collector electrode DC power supply V2 of the elementary of high frequency transformer T1 and 12V is serially connected with between the collector electrode and ground of transistor, the resonant capacitor C3 that a value is 13pF is parallel with at high frequency transformer T1 primary coil two ends, also a by-pass capacitor C2 is parallel with at collector electrode DC power supply two ends, the value of two by-pass capacitor C1 and C2 is 0.1uF, the secondary of high frequency transformer is signal output part, these secondary coil two ends are also parallel with the load resistance RL that resistance is 10k Ω.

Claims

1. the high frequency power amplifier for transmitter or thermatron, comprise a transistor, a high frequency transformer, a resonant tank capacitor, two by-pass capacitors and two DC power supply, it is characterized in that: the grounded emitter of described transistor and the negative pole of power supply, alternating message source and a base bias DC power supply is serially connected with between the base stage and ground of transistor, and these DC bias supplies two ends are parallel with the by-pass capacitor to AC signal short circuit, the elementary of high frequency transformer and collector electrode DC power supply is serially connected with between the collector electrode and ground of transistor, a resonant capacitor is parallel with at high frequency transformer primary coil two ends, also a by-pass capacitor is parallel with at collector electrode DC power supply two ends, the secondary of high frequency transformer is signal output part, these secondary coil two ends are also parallel with load resistance.

2. a kind of high frequency power amplifier for transmitter or thermatron according to claim 1, is characterized in that: the nominal value of described high frequency transformer is T1N=1; LE=1e-05H; LM=0.0005H; RP=RS=0.

3. a kind of high frequency power amplifier that can be used for transmitter or thermatron according to claim 1, is characterized in that: the model of described transistor Q1 adopts 2N2222 or 3DG6.

4. a kind of high frequency power amplifier for transmitter or thermatron according to claim 1, is characterized in that: the base bias DC power supply V1 of described transistor is 0.2 volt.

5. a kind of high frequency power amplifier for transmitter or thermatron according to claim 1, is characterized in that: the collector electrode DC power supply V2 of the collector electrode of described transistor is 12V.