Microcomputer low frequency electrotherapy instrument circuit diagram

Single chip microcomputer STM32L151CCU6

Microcomputer low frequency electrotherapy instrument circuit diagram

Microcomputer low frequency electrotherapy instrument schematic, microcomputer low frequency therapeutic instrument

There are three main physiological and therapeutic effects of low-frequency pulse current: 1. Exciting neuromuscular tissue 2. Promoting local blood circulation 3. Analgesia. In recent years, many low frequency therapeutic devices have appeared on the market. The circuit can output a variety of simulated human hand massage techniques, adjustable intensity, and a variety of modes to choose from. All kinds of components are common components on the market, and the inductance is a common color ring inductance. The output is preferably a patch dedicated to the treatment device.

As shown in the figure, the chip adopts the EMC78P156 of ELAN, and the power supply can be powered by three batteries.

working principle:

In the circuit, the P5.0 and P5.1 ports of the EM78P156 are used to control the waveform change, the P5.2 is used to drive the boost of the boost circuit, and the P5.3 is the signal for receiving the output-free automatic stop circuit for automatic entry. .P6.0 to P6.3 of the SLEEP state are used for pressing

Key detection, P6.4 to P6.7 for mode display.

The circuit is divided into four parts

First, the control circuit

It consists of button, single-chip microcomputer and indicator light. Press the corresponding button, the corresponding function output, the indicator light is on, the mode is adjustable. When the indicator light is used in multiple modes, it is used to display the current mode. The strength is adjustable, and the general output intensity is suitable for tolerance, and should not be too strong.

Second, the boost circuit

In the P5.2 port, a square wave with a certain pulse width and frequency is output, which is used to make Q1 in the switching state. The power supply is formed by the boost circuit composed of L1, Q1, D1, and C1, and the capacitor C1 is generated at both ends of the capacitor C1. Several times the voltage. Instead of always outputting the signal, let it keep boosting, just boost the voltage before the output, and stop the output, the boost circuit stops. If you want to strengthen the intensity, just widen the output signal time, for example, the first gear, the signal output 1MS, the second gear output 2MS, which second gear is much stronger than the first gear strength, it is recommended that the intensity change does not Too big, a little stronger, otherwise, the human body will be unbearable.

Third, the waveform control and output circuit

When outputting, let the booster circuit work, boost, and then, P5.0, P5.1 output separately, (note, the two ports can not be output at the same time), the output waveforms of P5.0 and P5.1 are the same at the output. Only the phase difference is 180 degrees. In this way, you can get the same feeling on the output side of the two outputs. There is no such thing as one port has a feeling and the other port has no feeling. In these two ports, you can control the on/off of this output circuit and the voltage of the above booster circuit to simulate various massage techniques. You can also refer to the modulation intermediate frequency, dense wave, thinning wave, and inter-literal on the Physiotherapy. Waves such as waves produce therapeutic functions such as analgesia and weight loss.

Fourth, no output automatic stop circuit

This circuit is in the case that the output has no load, no current flows through D3, D4, there is no voltage drop on it, Q6 has no base voltage, is in the off state, P53 port gets high level, when the high level time exceeds 5 seconds Clock, indicating no load, automatic stop, if there is load, there is current flowing, D3, D4, Q6 have base voltage, in the on state, P53 port gets low level, indicating load.

The basic principle of the low-frequency therapy device is first mentioned here. Next time, we will discuss the program flow and the human body's perception of different waveforms. What kind of waveforms have therapeutic effects on the human body.