JP2742937B2 - Low frequency treatment device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a low-frequency therapy device, and more particularly, to a voltage detection device for a stimulation voltage generated in a low-frequency therapy device.

[Prior Art] Conventionally, in a small and portable low frequency treatment, a battery is generally used as a power source because of its portability and compactness. However, the voltage generated by the battery is at most several volts, while the voltage that can be stimulated by the human body required for treatment is several tens to hundreds of volts, so the voltage generated by the battery is boosted to a voltage that can be stimulated by the human body. There is a need to.

However, in general, the voltage of a battery gradually decreases from its initial value as it is used due to its discharge characteristics.Therefore, when the battery is started to be used, the boost voltage is increased so that an appropriate human body stimulation voltage can be obtained. If set, the human body stimulation voltage will decrease as the treatment device is used. In consideration of this voltage decrease, it is common practice to increase the initial output voltage set value so as to obtain an appropriate human body stimulation voltage when used to some extent. In such a case, the initial stimulation of the battery caused considerable irritation to the human body, and the use and operation of the treatment device required caution.

In order to overcome this drawback, there is an electrotherapy device that detects a voltage from a booster circuit and controls the booster circuit based on the detected value.

FIG. 1 shows a basic circuit configuration of a conventional low frequency treatment device. In FIG. 1, reference numeral 1 denotes a power supply using a battery such as a dry battery or a storage battery, and reference numeral 2 denotes a booster circuit for boosting a battery voltage of several volts to a voltage required for treatment to several tens to one hundred volts capable of stimulating the human body. Reference numeral 3 denotes an output circuit whose output is controlled in output timing and the like via an output control circuit 5 by a pulse generated in the low frequency pulse generation circuit 4. Reference numeral 6 denotes a detection circuit for detecting the voltage boosted by the booster circuit 2. Reference numeral 7 denotes a voltage control circuit which controls the booster circuit based on the result detected by the detection circuit. As a result, a constant voltage necessary for human body stimulation is supplied to the output circuit.

As shown in FIG. 2, the conventional detecting circuit 6 includes a voltage dividing circuit 21, a reference voltage setting circuit 22, and a voltage comparing circuit.
23, the output of the booster circuit 2 is detected by the voltage divider circuit 21, the detected voltage is compared with the reference voltage set by the reference voltage setting circuit 22 by the voltage comparator circuit 23, and the voltage difference is calculated. The voltage is amplified and supplied to the control circuit 7, so that the voltage supplied from the booster circuit 2 is controlled to be constant.

[Problems to be Solved by the Invention] However, in the detection circuit 6 shown in FIG. 2, the voltage on the high voltage side which is boosted from several volts to several tens to hundreds of volts by the booster circuit 2 is always detected. As a result, battery consumption is accelerated.

As a specific example, when detecting the voltage boosted to 40 volts by the booster circuit 2, if the detection resistance of the voltage-divider circuit 21 is approximately 10 MΩ, the loss due to the detection is calculated as follows. 40 × 40/10 × 10 ⁶ = 0.16 × 10 ⁻³ (watt).

On the other hand, what is the output of the low-frequency therapeutic device is what watts, as a normal output voltage, is about 40 volts at a load of 1 kΩ, and the human body stimulation pulse width (t) is about 100 μs. Thus, as the human body stimulation pulses batch of power, as a single fraction or period of (T) is a low-frequency stimulation of 1Hz per ^{second, (40 2/1000) ×} (t / T) = (40 2/1000 ) × (100 × 10 ² /1)=0.16×10 ⁻³ (watt).

That is, it is clear that the power consumption required for voltage detection and the output power of the low-frequency treatment device are almost the same, and the use efficiency of the battery is poor.

If a detection resistor having a high resistance value is used as the detection resistor of the voltage dividing circuit 21, the power consumption due to the voltage detection can be suppressed.However, in this case, it is possible to prevent a variation in detection accuracy or to be affected by humidity. Means must be provided to prevent this, resulting in an increase in the price of the treatment device itself.

The present invention sets the output voltage required for human body stimulation to a constant voltage, and detects the output voltage in order to control the voltage so that no more voltage is generated. It is an object of the present invention to provide a low-frequency therapeutic device that can detect an output voltage with little change and with very little power consumption.

Means for Solving the Problems To achieve this object, a low-frequency therapeutic device according to the present invention includes a power supply, a booster circuit for boosting a voltage from the power supply, and a voltage supplied from the booster circuit. An output circuit for outputting the human body stimulation voltage as a human body stimulation voltage, a low frequency pulse generation circuit, an output control circuit for controlling the timing at which the human body stimulation voltage is output from the output circuit based on the pulse generated from the low frequency pulse generation circuit, A detection circuit for detecting a voltage supplied from the booster circuit, a voltage control circuit for controlling the booster circuit so that the booster circuit supplies a constant voltage by an output from the detection circuit, And a detection control signal generation circuit, which detects a voltage supplied from the booster circuit only when the detection control signal is sent from the detection control signal generation circuit to the detection circuit, and detects the voltage via the voltage control circuit. Then, the voltage supplied from the booster circuit is controlled to be constant.

Embodiment An embodiment according to the present invention will be described below with reference to FIGS. 3 to 6.

FIG. 3 shows a basic circuit configuration of the low frequency treatment device according to the present invention. In the figure, the circuits having the same functions as those of the conventional low frequency treatment device (FIG. 1) are given the same numbers. That is, 1 is a power supply by a battery such as a dry battery or a storage battery, and 2 is a booster circuit for boosting a battery voltage of several volts to a tens to hundreds of volts that can be stimulated by a human body necessary for treatment. Reference numeral 3 denotes an output circuit, the output of which is controlled via an output control circuit 5 by a pulse generated in the low frequency pulse generation circuit 4. 6 'is a detection circuit,
The voltage boosted by the booster circuit 2 is detected. Reference numeral 7 denotes a voltage control circuit which controls the booster circuit based on the result detected by the detection circuit. Reference numeral 8 denotes a detection control signal generation circuit which detects a voltage supplied from the booster circuit 2 only when a detection control signal is sent from the detection control signal generation circuit 8 to the detection circuit 6 ', and controls the voltage control circuit 7 Thus, the voltage supplied from the booster circuit 2 is controlled to be constant.

Next, one form of the relationship between the detection control signal generation circuit 8 and the detection circuit 6 'will be described with reference to FIG. 4, but the present invention is not limited to this form, and the detection control signal generation circuit 8 Only when a detection control signal is sent to the circuit 6 ', the voltage supplied from the booster circuit 2 is detected, and the voltage supplied from the booster circuit 2 is controlled via the voltage control circuit 7 so as to be constant. Any circuit configuration may be used as long as it satisfies the following relationship. 4, the detection circuit can be composed of, for example, a voltage dividing circuit 41, a reference voltage setting circuit 42, and a voltage comparing circuit 43. Then, only when a detection signal is generated from the detection control signal generation circuit 8, the voltage dividing circuit 41 conducts, and the output of the booster circuit 2 is connected to the voltage dividing circuit.
41, the detected voltage is compared with a reference voltage set in a reference voltage setting circuit 42 by a voltage comparing circuit 43,
The voltage difference is amplified and supplied to the control circuit 7, so that the voltage supplied from the booster circuit is controlled to be constant. FIG. 5 shows the relationship between the period t during which the detection control signal is generated and the detection period T. And the sixth
The figure shows the relationship when the period t during which the detection control signal is generated is equal to or approximately equal to the human body stimulation pulse width, and the detection period T is equal to or approximately equal to the period of applying the stimulation voltage to the human body. However, this is only an example, and the period t in which the detection control signal is generated is always equal to or approximately equal to the pulse width of the human body stimulation, and the detection period T is equal to or approximately equal to the period of applying the stimulation voltage to the human body. It is not necessary, and the period during which the detection control signal is generated can be made considerably smaller than the pulse width of the human body stimulation, so that the power consumption required for voltage detection can be further reduced.

If the power loss in the voltage detection is calculated in the present invention, the voltage boosted to 40 volts by the booster circuit is used for a period of 100 μs (a detection control signal is period t), when carried out in a cycle of 1 Hz (detection period ^{T), (40 2/10} × 10 6) × t / T = (40 2/10 × 10 6) × (100 × 10 -6 / 1) = 1.6 × 10 ⁻⁸ (watt), and the power consumption is 1 / 10,000 compared with the above-mentioned conventional example of 0.16 × 10 ⁻³ watt, and the use efficiency of the battery is improved and stable. Detection can be performed. Moreover,
It is also possible to use a detection resistor with a smaller resistance value (although power consumption will increase slightly at that time), and it is possible to use a detection resistor that is inexpensive and has excellent characteristics.

[Effects of the Invention] As described in detail above, according to the low-frequency treatment device of the present invention, voltage control can be performed with low power consumption and stable output can be ensured. It is also possible to perform safe treatment with simple operation.

[Brief description of the drawings]

FIG. 1 shows a conventional example of a circuit configuration of a low-frequency treatment device, and FIG.
The figure shows a conventional example of a detection circuit used in a low-frequency treatment device. FIG. 3 shows a circuit configuration of the low-frequency therapeutic device according to the present invention, and FIG. 4 shows one form of a relationship between a detection circuit and a detection control signal generating circuit used in the low-frequency therapeutic device according to the present invention. It is a thing. FIG. 5 shows the relationship between the period t during which the detection control signal is generated and the detection period T. FIG. 6 shows the relationship between the period t during which the detection control signal is generated and the pulse width of the human body stimulus. It shows one form of the relationship between the cycle T and the cycle of applying a stimulation voltage to the human body. DESCRIPTION OF SYMBOLS 1 ... Power supply 2 ... Boost circuit 3 ... Output circuit 4 ... Low frequency pulse generation circuit 5 ... Output control circuit 6 '... Detection circuit 7 ... Voltage control circuit 8 ... Detection control signal generation circuit.

Claims (1)

(57) [Claims] 1. A power supply, a booster circuit for boosting a voltage from the power supply, an output circuit for outputting a voltage supplied from the booster circuit as a human body stimulation voltage, a low-frequency pulse generating circuit, and the low-frequency pulse An output control circuit that controls the output circuit based on a pulse generated from a generation circuit, a detection circuit for detecting a voltage supplied from the booster circuit, and the booster circuit outputs a constant voltage based on an output from the detection circuit. A low-frequency therapeutic device having a voltage control circuit for controlling the boosting circuit so as to supply the voltage, further comprising a detection control signal generation circuit, and a detection control signal is sent from the detection control signal generation circuit to the detection circuit. A low-frequency treatment device wherein the voltage supplied from the booster circuit is detected only when the voltage rises.