An electrotherapy device capable of gradually increasing stimulation intensity, comprising:
- a direct-current (DC) power supply unit configured to provide electric power required for operation of the electrotherapy device;
- a pulse output circuit configured to generate and send electrical pulses of predetermined waveforms after receiving the electric power from the DC power supply unit;
- a control unit configured to generate and output at least one first control signal for a first period of time and at least one second control signal for a second period of time which starts at or later than an end of the first period of time, wherein the first control signal varies pulse waveforms of the electrical pulses in modulated intensity and not in modulated waveforms, modulated frequencies or modulated rest period durations, and the second control signal varies the pulse waveforms of the electrical pulses in modulated waveforms, modulated frequencies and modulated rest period durations, and not in modulated intensity;
- a voltage regulation circuit separately electrically connected to the DC power supply unit, the control unit and the pulse output circuit;
- configured to:
- receive the first control signal from the control unit;
- regulate a voltage output from the voltage regulation circuit to the pulse output circuit according to the first control signal;
- vary the pulse waveforms of the electrical pulses in modulated intensity based on the voltage regulated according to the first control signal;
- and
- increase an output current of the pulse output circuit from a low value to a predetermined value gradually based on the voltage regulated according to the first control signal;
- and comprising:
- a first resistor having a first end configured to receive the first control signal from the control unit, and a second end opposite to the first end, the first resistor being configured to stay in a low-level state before receiving the first control signal;
- a first transistor having a first base connected to the second end of the first resistor, a grounded first emitter, and a first collector, and configured to:
- stay in a cut-off state before receiving the first control signal through the first resistor;
- and
- enter a turned-on state in response to receiving the first control signal through the first resistor;
- a second resistor having a first end connected to the first collector of the first transistor, and a second end opposite to the first end of the second resistor;
- a third resistor having a first end connected to the second end of the second resistor, and a second end opposite to the first end of the third resistor;
- a first capacitor having a first end connected to the second end of the second resistor and the first end of the third resistor, and a grounded second end opposite to the first end of the first capacitor, and configured to:
- stay in a saturated state when the first transistor is in the cut-off state;
- begin discharging in response to the first transistor entering the turned-on state;
- remain discharging during the first period of time;
- become completely discharged and stop discharging before the end of the first period of time;
- once become completely discharged, start to be charged by the electric power sent from the DC power supply unit through the third resistor;
- and
- continue to be charged during the second period of time;
- a second transistor having a second base electrically connected to the second end of the second resistor, the first end of the first capacitor and the first end of the third resistor, a second emitter connected to the pulse output circuit, and a second collector electrically connected to the second end of the third resistor and configured to receive the electric power from the DC power supply unit, and configured to:
- during the charging of the first capacitor in the second period of time, undergo state changes including entering a turned-on state from a cut-off state and then exiting from the turned-on state to an amplification state until a saturated state is reached;
- and
- raise, via the state changes of the second transistor, an amplitude of the pulse waveforms output from the pulse output circuit gradually from a low level to a predetermined high level as electric current flowing through the second transistor gradually increases;
- an output control circuit electrically connected to the control unit and configured to receive the second control signal from the control unit and vary the pulse waveforms of the electrical pulses in modulated waveforms, modulated frequencies and modulated rest period durations based on the second control signal;
- and
- at least one electrode pad electrically connected to the pulse output circuit and configured to receive the varied electrical pulses and the gradually increased output current from the pulse output circuit, stimulate at least one corresponding acupoint on a human body with gradually increasing intensity with the varied electrical pulses and the gradually increased output current, and thereby simulate forces and tactile sensations of a typical manual massage on the acupoint by hand.