JPS5897904A - High frequency generating circuit - Google Patents

Abstract

PURPOSE:To generate higher harmonics by connecting a diode between the base of a transistor (TR) and an AC input terminal and further connecting another diode in the opposite polarity relation between the emitter and the AC input terminal, and thus folding an AC waveform. CONSTITUTION:The base B of an NPNTR4 and an AC input terminal 3 are connected mutually through a capacitor C3, a diode (D)1 and a resistance R6. Between the emitter E of the TR4 and the input terminal 3, a D2 connected reversely to the D1 and a variable resistance Rv are connected. When an alternating current appearing at the terminal 3 is positive, the TR4 operates as a common emitter TR and a negative component waveform appears at an output terminal 5 through the collector C. When it is negative, the TR4 operates as a common base TR and an univerted waveform is outputted to the collector C. Therefore, the AC waveform is folded and outputted from the output terminal 5. The waveform at this time takes a waveform obtained by rectifying the input alternating current on full-wave basis to generate higher harmonics easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field of the invention The present invention mainly relates to Tt used in a carrier current supply device.
Regarding the 4th harmonic generation circuit.

(2) Background of the technology Conventionally, as harmonic generation circuits for carrier waves, there are those using magnetic saturation mile fA, and those using transformers to generate alternating current (Fig. 3C).
There is a waveform folding circuit etc. that shapes the waveform as shown in B). The former generates harmonics by saturating a rectangular magnetic core with high magnetic permeability with a high magnetic field, and the frequency of use is limited by the high frequency characteristics of the rectangular magnetic core. Since the latter also uses a nine-to-two amplifier, the frequency of use is limited by the transmission frequency characteristics of the transformer.

Therefore, there is a need for a harmonic generation circuit that has good frequency characteristics and consumes less power.

(3) Problems with the Prior Art FIG. 1 shows a harmonic generation circuit using a magnetic saturation coil.

In the figure, the main oscillator 10 that outputs the fundamental frequency, the AC output is a high N wave blocking coil LI I capacitor CI
When the instantaneous value of the AC output is small, the coil L is no good! The inductance of L is large, and as the instantaneous 1iiF value of the AC output increases, the coil L is rapidly saturated and the inductance becomes H. As a result, when a zero load resistor is connected to both ends of the coil L, a pulse voltage is generated at both ends of the coil L, the pulse voltage is
The CI is charged and the coil is turned on! When the capacitor C3 is saturated, the charging voltage of the capacitor C3 discharges the coil Lt. This causes the triangular wave voltage Pit to be output to the negative resistance (I). Also, the wrinkled waveform P1 is rectified by the rectifier 2, which is connected to the diodes Ree 1 to 4, and is output to the waveform P and 2t - the load resistance (JEm). .

The waveform P1 generates an odd-order harmonic wave, and a skeleton waveform Phi21, even-board height v4v, is generated in the load resistance (#s).In the case of generation of a pot #JIAt& of 0 or more, the magnetic saturation coil L.

A large alternating current is required for the movement of the magnetic saturation coil L, and the magnetic permeability of the rectangular magnetic core of the magnetic saturation coil L decreases at high frequencies, making it impossible to obtain a high-order separator. , there is a limit to the high-frequency characteristics of the transformer, and using a transformer in the electronic circuit not only increases the cost of the circuit, but also has the drawback of increasing the size of the device. 4) Purpose of the Invention In order to solve the above-mentioned drawbacks, the present invention provides a novel harmonic generation method using a waveform folding circuit with good high-order harmonic characteristics and a simple circuit configuration consisting of transistors, diodes, several resistors, and capacitors. The present invention is intended to provide a circuit t-.

(5) Structure of the Invention According to the present invention, an 11g1 diode is connected between the pace of the transistor and the input terminal of the alternating current, and a second diode is connected between the emitter of the cough transistor and the input terminal of the alternating current. 1 is connected in the opposite direction to the diode, and when the alternating current applied to the input terminal is positive, the wrinkle transistor operates in a common emitter (or common base) format, and when the alternating current is negative, the transistor operates with a common base. (or by operating in a grounded emitter) mode, this is achieved by folding back the waveform of the skeleton alternating current.

(6) Examples of the invention
(Hereinafter, the present invention will be explained based on the embodiment shown in FIG. 2 and the folded waveform diagram shown in FIG. 3.

In Fig. 2, the alternating current shown in the third column is input to the terminal 3, and the positive component (+) of the alternating current is connected to the capacitor Cs *
'jllE 1 diode Dle resistor 6, NPN
It is input to the base B of a type transistor (hereinafter referred to as a transistor) 4, and the positive component (+) of the square current prisoner becomes an inverted waveform, that is, a negative component (-) waveform, and is outputted from the output terminal 5 through the collector C. .

In this case, the operation of the transistor 4 is of the terminal ground type.

At the next time, when the negative component (-) of the AC voltage is input to the input terminal 3 to the emitter E of the transistor 4, the variable resistor Rv
The second diode D, becomes conductive through t. At this time, the transistor 4 operates in a grounded manner.

With the above operation, the AC waveform is turned back and the waveform outputted from the output terminal 5 becomes a waveform obtained by full-wave rectification of the AC waveform.

Next, we will discuss in detail the shaping of waveforms.

Here, the voltage at each point of the transistor 4 is the following voltage p: o
Base Bot pressure ivi, emitter about 1 kg,
The voltage between the pace B and the construction vine E is the voltage at the 00 point YA dVA = VII - Vd1 (= 10 ΔV; /
(At the operating voltage of the ode D, the potential of the Vll is
The potential of f3 is 'vm'ttc (equal), Vl:V
CXR.

/ (R4+R1). Here, V.C.
is the power supply voltage.

On the other hand, the voltage VD at point ■ is VD = VI Vll +V
dm (=-ΔV; operating voltage of diode DI)
shall be.

The minute voltages +Δ■ and -ΔV can be obtained by adjusting the variable resistor Rv. Here, the positive component of the alternating current (+
) is input to the input terminal 3, and the potential V at the 0 point becomes +ΔV(
When the voltage exceeds the dotted line, ), the transistor 4 is turned on, and an inverted waveform (-)' is output to the collector C. Next, the negative component (-) of the AC voltage is input, and when the potential at the 0 point becomes less than 1 ΔV (dotted line), a non-inverted waveform (-) is output to the collector C. Waveform ■ is output terminal 5
It will be output as expected.

As is well known, the waveform (6) is represented by a 7-Lier series, and its components consist of 14 odd-order high waves and an even-order harmonic group. In particular, if the band Δa3)' of the second part is widened, many even-order harmonics will be generated.

The second part of ) of the above waveform is connected to the diodes D8 and Dl.
The respective voltages Vd1. In the dead zone due to Vd, and ω)
Expanding the two parts outputs more even-order harmonics. In this case, this is achieved by lowering the potential VA at the 0 point by the necessary amount and increasing the potential at the 0 point by the necessary amount.

The above pattern was described using an NPN transistor, but it is also possible to use a PNP transistor. Transistor, diode and several points 2
It can be realized with a simple circuit consisting of a resistor and a capacitor, and it does not require (1) a transformer and (2) a magnetic saturation coil as in the prior art, so high-order high-wave waves can be easily obtained. It has the advantage of being compact and power saving.
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[Brief explanation of drawings]

Figure 1: Harmonic generation using a FIA saturation coil Figure 3 shows alternating current and folded waveforms In Figure 0, 1 is the main oscillator;
2 is a rectifier, 3 is an input terminal, 4 is a transistor, 5L output terminal, 01-C1r1 diagram

Claims (1)

[Claims] In a harmonic generation circuit that shapes the waveform of alternating current and generates harmonics, a whistle diode is connected between the base of the transistor and the input terminal of the alternating current, and a *2 diode is connected between the emitter of the transistor and the input terminal of the alternating current. is connected in the opposite direction to the first diode, and when the alternating current appearing at the input terminal is positive, the transistor operates in an emitter-grounded (or base-grounded) format, and when the alternating current is negative, the transistor operates as A harmonic generation circuit characterized in that the alternating current waveform is folded back by operating in a grounded base (or grounded emitter) format.