JPS6013486Y2 - AC high voltage generator for potential therapy equipment - Google Patents

Description

[Detailed explanation of the invention] This invention separately divides the AC voltage to be boosted into positive and negative parts, alternately modulates the high frequency oscillation voltage of each, converts this modulated voltage into a high voltage using a step-up transformer, and converts this high voltage into The present invention relates to an alternating current high voltage generator for a potential treatment device, which obtains an alternating current high voltage of a modulated wave frequency by performing detection rectification and then rectification.

Generally, when generating AC voltage using a step-up transformer, methods are used, such as boosting the commercial frequency voltage with the step-up transformer, or setting a voltage at a certain frequency through oscillation, and then boosting it with the step-up transformer. In such a conventional AC high voltage generator for electric potential therapy, the output variable range for the frequency of one step-up transformer is determined by adjusting the winding of the step-up transformer itself to the actance as far as the frequency is low, so that the magnetic flux density is Since the setting is made so that saturation does not occur with respect to the iron core, the device itself becomes very large, and the frequency is set within a certain range.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and provides an AC high voltage generator for a potential therapy device that can handle a wide range of input voltage frequencies.

This invention will be explained below with reference to the drawings.

FIG. 1 shows the principle of this invention.

In this figure, 1 is a modulated wave oscillator, which divides the waveform to be boosted into a high voltage of the desired frequency into positive and negative parts and generates two output voltages with a 180 degree phase difference. Commercial power can be used directly.

2 and 3 are modulated oscillation amplification circuits, which generate a carrier wave with a high frequency voltage at a predetermined level and constant frequency, for example, about 20 KC, in a self-excited or separately excited manner, and are modulated by the output of the modulated wave oscillator 1; Performs an amplifying action.

For example, the modulated oscillation amplifier circuit 2 on the positive side is amplitude-modulated on one of the outputs of the modulated wave oscillator 1, and the modulated oscillation amplifier circuit 3 on the negative side is amplitude-modulated on the other output. do.

Step-up transformers 4 and 5 step up the modulated carrier outputs of the modulated oscillation amplifier circuits 2 and 3, which are applied to the negative side and are applied to the positive side and the negative side, as they are, and output them to the secondary side.

6 is a positive and negative output combining section, rectifiers 7, 8, capacitor 9,
10 and protective resistors 11.12.

13 and 14 are output terminals.

Next, the operation of FIG. 1 will be explained with reference to the waveform diagram of FIG. 2.

The modulated wave oscillator 1 generates a voltage with a desired frequency and a desired output waveform.

Now, it is assumed that a sine wave voltage A is generated, of which a positive modulated wave voltage B and a negative modulated wave voltage C are applied to modulated oscillation amplifier circuits 2 and 3, respectively.

On the other hand, the modulated oscillation amplifier circuits 2 and 3 are both at a constant level (
A high-frequency voltage (the level of which is variable) is generated in a self-excited or separately-excited manner, and this high-frequency voltage is further modulated by the positive modulating wave voltage B or the negative modulating wave voltage C described above.

Therefore, the voltages applied to the primary sides of the step-up transformers 4 and 5 become modulation voltages E and F.

These modulated voltages E and F are stepped up by a step-up transformer 4.5, and a desired high voltage is generated on the secondary side.

From this high voltage, positive or negative voltages G and H are taken out by the rectifiers 7 and 8 of the positive and negative output combining section 6, and are output to output terminals 13 and 14.

That is, a synthetic AC high voltage (2) appears at the output terminals 13 and 14.

This AC high voltage (2) is a boosted version of the first sine wave voltage (A).

In this case, even if the waveform and frequency of the sine wave voltage A to be boosted changes, the high frequency voltage generated in the modulation oscillation amplifier circuits 2 and 3 always has a constant frequency, so the step-up transformers 4 and 3
is excited by a high-frequency voltage with a constant frequency, and can perform highly efficient boosting without distortion.

FIG. 3 is a circuit diagram of the main parts showing an embodiment of this invention based on the above-mentioned principle, in which the upper half of the modulation oscillation amplification circuit 2, step-up transformer 4 and positive/negative output synthetic leather section 6 in the circuit diagram of FIG. 1 is shown. This corresponds to

In FIG. 3, Ql and Q2 are transistors, R1 and R
2 is a resistor, Eo is a power supply, 4P is a primary winding, 4S
is a secondary winding, and 4F is a feedback winding, which constitute the modulation oscillation amplification circuit 2' and the step-up transformer 4.

The transistor Q2 performs self-oscillation by the primary winding 4P1 and the feedback winding 4F, and generates a high frequency.

On the other hand, when, for example, a positive harmonic voltage B is applied to the base of the transistor Q□ through the input terminal S, the transistor Q□ becomes conductive and current flows to the base of the transistor Q2.

At that time, modulation is also performed by transistor Q2, and secondary winding 4
S represents a boosted modulation voltage E in FIG. 2.

This is rectified by the rectifier 7 and becomes the voltage G shown in FIG.

Note that resistor R2 is a bias resistor, and resistor R1
acts as a protective resistor.

FIG. 4 shows another embodiment of this invention, showing the same parts as FIG. 3.

In this embodiment, the collector and emitter of the transistor Q are connected in series with the feedback winding 4F, and a positive harmonic voltage B, for example, is applied to the base. Since it is the same as , detailed explanation will be omitted.

Note that in both Figures 3 and 4, we have explained only the positive voltage side in Figure 1, that is, the upper half, but by reversing the polarity of each part, we have explained the negative voltage side, that is, the lower half. It is clear that a circuit corresponding to can be constructed.

Further, the voltage waveform generated by the modulated wave oscillator 1 is not limited to a sine wave, but may be other waveforms such as a square wave or a triangular wave.

In each of the embodiments shown in FIGS. 3 and 4, the current is automatically limited to prevent excessive current from flowing, and therefore has excellent medical safety.

That is, when the load is short-circuited, the impedance on the secondary side of the step-up transformers 4 and 5 decreases, so that the impedance on the negative side similarly decreases.

This means that the high frequency oscillation frequency by transistor Q2 increases.

As the high frequency oscillation frequency increases, the reactance to the high frequency increases, so a current limiting action is automatically performed on the current, and a constant current no longer flows to the load.

Furthermore, if the output of the secondary winding 4S of the step-up transformer 4 is voltage-doubled and rectified, the desired AC high voltage can be made higher.

As explained above, this invention modulates the high frequency voltage with the positive and negative voltages of the AC voltage to be boosted, applies them to the step-up transformer, and combines them after boosting to obtain the required AC high voltage. The high-frequency voltage applied to the step-up transformer remains constant regardless of the waveform and frequency of the AC voltage to be stepped up, and since it is a high frequency, the smaller the iron core is, the wider the frequency change of the input AC voltage can be, resulting in more efficient step-up. It can be performed.

In addition, since a feedback winding is provided in the step-up transformer, and oscillation and modulation are performed by a transistor, not only is the configuration simple due to self-excited oscillation, but even in the event of a load short-circuit, the current exceeding a certain value is prevented by the current limiting effect. It is safe because it does not flow, and is suitable for use in medical devices.

Further, since the modulation oscillation amplifier circuit is designed to be able to change the high frequency voltage, even if there is a change in the peak value of the AC voltage to be boosted, 100% modulation can always be performed in accordance with this change.

Furthermore, since both modulation amplifier circuits can vary their output voltages, by adjusting these independently, the ratio of positive and negative AC high voltages obtained can be easily changed.

In addition, in this invention, the positive and negative output combining section consists of diodes that rectify the outputs of each step-up transformer, and protective resistors that have one end connected to the output side of each of these diodes and the other end connected in common. Because of this structure, it has many advantages such as being extremely easy to structure and having excellent reliability since there are no moving parts.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing the principle of this invention, Figure 2 is a waveform diagram of each part to explain the operation of Figure 1, and Figures 3 and 4 are circuits showing examples of this invention. It is a diagram. In the figure, 1 is a modulated wave oscillator, 2 and 3 are modulated oscillation amplifier circuits,
2' is a modulation oscillation amplifier circuit, 4 and 5 are step-up transformers, 6 is a positive and negative output combining section, 7 and 8 are rectifiers, 9 and 10 are capacitors, 11.12 is a protective resistor, 13.14 is an output terminal,
Q,, Q2 are transistors, R□, R2 are resistors, Eo
is a power supply, 4P is a primary winding, 4S is a secondary winding, and 4F is a feedback winding.

Claims (1)

[Scope of utility model registration request] It consists of a modulated wave oscillator, a modulated oscillation amplifier circuit that modulates a required high frequency voltage with a positive voltage or a negative voltage, two step-up transformers, and a positive and negative output combining section, and both step-up transformers have a primary winding, a secondary comprising a next winding and a feedback winding,
Both of the modulation oscillation amplification circuits oscillate high-frequency voltages using the primary winding and feedback winding of the step-up transformer, and each of the modulation oscillation amplification circuits is composed of transistors that are modulated by a positive voltage or a negative voltage of the output of the modulation wave oscillator, and further The positive and negative output combining section is composed of diodes that rectify the outputs of both step-up transformers, and protective resistors each having one end connected to the output side of these diodes and the other end connected in common. An alternating current high voltage generator for electric potential treatment equipment, which is characterized by: