JPS5828605Y2 - Low frequency therapy waveform generator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a low-frequency treatment waveform generator, which obtains the output necessary for low-frequency treatment while limiting and averaging the current conduction period from the driving battery power source. The purpose is to reduce the power consumption of battery power sources.

In conventional low frequency therapeutic waveform generators, a second square wave generating fundamental frequency is used as a means to limit the duration of current conduction from the battery power supply when amplifying the therapeutic waveform output pulses of the second square wave generator. Next to the wave generator, a monostable multivibrator can be combined, or a second
The feedback circuit of the second square wave generator was devised to change the duty of the operating output of the second square wave generator. When attempting to amplify approximately 200 extremely sharp operational output pulses, the circuit becomes complicated or the current conduction period cannot be sufficiently limited, resulting in
It was not possible to significantly reduce the power consumption of the battery power source.

The present invention has been devised to solve the above-mentioned conventional drawbacks, and the present invention will be described below based on drawings showing embodiments thereof.

In FIG. 1, 1 is a first square wave generator that generates a group waveform frequency, and 2 is a second square wave generator whose input is connected to the output of the first square wave generator 1 and whose operation is controlled by the output. a square wave generator; 3 an amplifier for amplifying the operational output pulses of the second square wave generator 2; 4 a pulse output circuit to which the pulses amplified by the pulse amplifier 3 are sent as human input signals; This envelope control circuit 5 is an envelope control circuit that shapes the output of the square wave generator 1 as a control waveform.
is configured to connect its output to the input of the pulse output circuit 4 and to control the envelope sent to the input as an input signal.

FIG. 2 shows a specific circuit configuration of the pulse amplifier 3 and the pulse output circuit 4. is connected to one end a of the differential circuit, and the other end of the differential circuit is connected to the first end a. second transistors 8, 9 and a plurality of resistors 10.
11, which is a direct-coupled complementary cascaded semiconductor amplifier, ie, a pulse amplifier 3.

The pulse output circuit 4 also includes a transistor 14 whose base is connected to the collector of the second transistor 9 of the pulse amplifier 3 via a resistor 12.13;
a resistor 15 connected between the base and emitter of the transistor 14; a transformer 16 whose primary winding is connected to the collector of the transistor 14; a diode 17 connected to the primary winding side of the transformer 16; It consists of a variable resistor 18 and a diode 19 connected to the secondary winding side of the transformer 160.

Reference numeral 20 denotes a driving battery power source, and storage capacitors 21 are connected to both ends of this driving battery power source 20.

The operation of the circuit configurations shown in FIGS. 1 and 2 will be explained.

First, the fundamental frequency generated by the second square wave generator 2 is modulated by the group wave frequency generated by the first square wave generator 1, and the operating output of the second square wave generator 2 is connected to the capacitor 6. By connecting to the pulse amplifier 3 through a differentiating circuit for shaping an input signal consisting of a resistor 7, the differentiating circuit limits the period of current conduction from the driving battery power source 20, and also by utilizing the characteristics of the differentiating circuit. , by overdriving the base current of the first transistor 8 of the pulse amplifier 3 at the beginning of the rise of the pulse waveform,
The switching loss of the transistor 14 of the pulse output circuit 4 can be reduced, and the envelope control circuit 5 can shape the output of the first square wave generator 1 as a control waveform, so that the rise of the group waveform frequency can be reduced. By making it looser, it is possible to soften the electrical stimulation when using a low frequency treatment device.

Furthermore, since a storage capacitor 21 having a capacity that can correspond to the current change during the differential time constant period of the input signal shaping differential circuit is connected to the driving battery power source 20, the capacitor 2
1 can supply a pulse current sufficient to operate the pulse output circuit 4. This can prevent a large amount of peak current from being consumed from the drive battery power source 20, and As a result, driving battery power supply 2
0, even if a small battery with a relatively large internal resistance is used, the output necessary for low frequency treatment can be secured sufficiently, and the driving battery power source 20 is not overloaded. The current consumption from the driving battery power source 20 can be averaged, thereby reducing the power consumption of the driving battery power source 20.

As described above, according to the present invention, the pulse amplifier and pulse output circuit that amplify the operational output pulse of the second square wave generator are configured by the input signal shaping differential circuit and the direct-coupled complementary cascade semiconductor amplifier. In addition, a storage capacitor with a capacity that can accommodate current changes during the differential time constant period of the input signal shaping differential circuit is connected to the drive battery power source. Since the capacitor makes it possible to limit and average the current conduction period from the driving battery power source, it is possible to reduce the power consumption of the driving battery power source.

In addition, by adopting a differentiator circuit, it is possible to increase the peak of the input signal to the pulse amplifier, making it easier to obtain pulses with a quick rise.Moreover, even if a small battery with a relatively high internal resistance is used, it can be used for low-frequency treatment. This provides various practical effects such as being able to secure a sufficient amount of necessary output.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a low frequency therapeutic waveform generator showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific example of a pulse amplifier and a pulse output circuit in the generator. DESCRIPTION OF SYMBOLS 1... First square wave generator, 3... Pulse amplifier, 4... Pulse output circuit, 6, 7...
... Differential circuit, 20 ... Drive battery power supply, 21 ... Storage capacitor.

Claims (1)

[Scope of utility model registration request] a first square wave generator for generating a group waveform frequency, a second square wave generator having an output connected to an input and whose operation is controlled by the output of the first square wave generator; a pulse amplifier that amplifies the operational output of the square wave generator No. 2; a pulse output circuit to which the pulse amplified by the pulse amplifier is sent as an input signal; and a driving battery power source; The pulse output circuit is composed of a differentiating circuit for input signal shaping and a directly connected complementary cascade semiconductor amplifier, and the driving battery power supply is configured to correspond to current changes during the differential time constant period of the differentiating circuit for shaping input signals. 1. A low frequency therapeutic waveform generator, characterized in that a storage capacitor is connected to the storage capacitor.