Physiotherapy instrument baking lamp control circuit

Abstract

The utility model discloses a physiotherapy instrument baking lamp control circuit comprising a power supply module, a control module, a heating module, a button input module, a display module, a buzzer alarm module and a safety protection module. The power supply module converts alternating current into stable direct current through a rectifier bridge and a filter capacitor; the control module takes a single-chip microcomputer as a core and is matched with an LED driving chip to realize signal processing and display control; the heating module adjusts the power of a heating tube through an optical coupler and a silicon controlled rectifier, and sets four gears of warm, low temperature, medium temperature and high temperature; the key input module supports circulating setting of treatment time and temperature gears; the display module displays parameters in real time through a nixie tube and a state indicator lamp; the buzzer alarm module is used for providing startup and treatment end prompts; the safety protection module adopts a toppling switch, and a heating power supply is automatically cut off when equipment tilts. According to the utility model, the heating power is accurately controlled through a PWM signal, and different treatment requirements are met by combining with a multi-gear design; and the safety is improved through the dumping protection function.

Description

Technical Field

[0001] This utility model relates to a control circuit for a heat lamp in a physiotherapy device, belonging to the field of electronic equipment control technology. Background Technology

[0002] Medical electromagnetic wave heating lamps are common physiotherapy devices that promote blood circulation and relieve muscle pain through electromagnetic wave heating, and are widely used in homes and medical institutions. Traditional heating lamp devices typically use simple switches to control the heating element, resulting in rudimentary power adjustments and imprecise temperature control, making it difficult for users to flexibly adjust the treatment intensity according to their needs. Furthermore, existing devices have limited functionality in terms of time setting and status display, often relying on mechanical knobs or fixed settings, making operation inconvenient and lacking in intelligence. Simultaneously, safety protection measures are insufficient; for example, there is a lack of tilt protection, meaning that if the device accidentally tipes over, the heating element may continue to operate, posing a fire hazard or burns. As people's demands for safety, comfort, and intelligence in physiotherapy equipment increase, the limitations of traditional heating lamps are becoming increasingly apparent. Therefore, developing a heating lamp control circuit that integrates multi-level precise temperature control, intelligent display, and safety protection has become an urgent problem to be solved in the current technological field. Utility Model Content

[0003] The purpose of this invention is to provide a control circuit for a physiotherapy lamp, which can effectively solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] It includes a power supply module, a control module, a heating module, a key input module, a display module, a buzzer alarm module, and a safety protection module;

[0006] The power module includes: a resistor-capacitor step-down circuit, a rectifier circuit, a filter circuit, a voltage regulator circuit, and a zero-crossing detection circuit;

[0007] The resistor-capacitor step-down circuit is used to step down the input AC power, including a current-limiting resistor (RS1) and a step-down capacitor (C1); and resistors R1 and R2 ensure that the step-down capacitor C1 discharges quickly after the power is disconnected to prevent electric shock hazard.

[0008] The rectifier circuit includes a rectifier bridge U2 (MB6SU), which is used to convert the stepped-down AC power into pulsating DC power for use by the entire control circuit.

[0009] The filter circuit includes a filter capacitor E1 to reduce ripple and provide a smooth DC output.

[0010] The voltage regulator circuit uses two Zener diodes (D5 and D6) to provide a stable low-voltage output;

[0011] The zero-crossing detection circuit divides the signal through resistors R8, R9, R10, and R11, and inputs it to the base of transistor Q4 (S8050). When the AC voltage crosses zero, the base voltage is lower than the conduction threshold of transistor Q4, and Q4 is turned off, thus realizing the opening or closing of the thyristor Q3.

[0012] The control module includes a microcontroller U3 (SC8F2892B) and an LED driver chip U1 (TM1617). The microcontroller U3 is used to process user input, control the power of the heating lamp and monitor the temperature, and the LED driver chip U1 is used to control the digital tube (LED1) to display the temperature and time information set by the user.

[0013] The heating module includes an optocoupler U4 (MOC3022) and a silicon controlled rectifier Q3 (BT136600E_B). The microcontroller U3 drives the silicon controlled rectifier Q3 through the optocoupler U4, receives the PWM signal from the control module, adjusts the power output of the heating tube, and realizes the control of the heating lamp.

[0014] The button input module includes buttons KEY1 and KEY2, as well as a time button and a temperature button, which are connected to the input pins of the main control module for setting the treatment time and temperature level.

[0015] The display module includes a digital tube LED1 and status indicator lights (D1D5), driven by the display LED driver chip U1, and is used to display treatment time and temperature level.

[0016] The buzzer alarm module is connected to the control module and is used for power-on prompts and treatment completion alarms;

[0017] The safety protection module is connected to the control module and is used to shut off the heating element when the machine is tipped over.

[0018] Furthermore, the heating module has four temperature settings, which are arranged in ascending order of power: warm (70% power, running for 1 minute and then pausing for 25 seconds to cycle), low (80% power, running for 1 minute and then pausing for 15 seconds to cycle), medium (90% power, running for 1 minute and then pausing for 7 seconds to cycle), and high (100% power). Each setting is matched with a status indicator light; D2 is the warm setting, D3 is the low setting, D4 is the medium setting, and D5 is the high setting.

[0019] Furthermore, the control module controls the conduction state of the heating module through a thyristor to achieve adjustment of different power levels.

[0020] Furthermore: the treatment time is cycled through the time setting button, and the digital LED1 is used to display the set treatment time in real time; the first press displays 30 minutes; the second press displays 60 minutes; the third press displays "" (continuous operation); the fourth press returns to standby mode (displays 00, heating off).

[0021] Furthermore: the tilt protection switch of the safety protection module is mechanical or electronic, and automatically cuts off the power supply to the heating module when the tilt angle of the equipment exceeds the set threshold; the safety protection module adopts a tilt switch (bent angle) of model Rbs070410b or a tilt switch (right angle) of model Rbs070310b.

[0022] The beneficial effects are:

[0023] 1. By setting four temperature levels—warm (70% power), low (80% power), medium (90% power), and high (100% power)—and adjusting the heating tube power output using a PWM signal, precise temperature control can be achieved to meet the treatment needs of different users and improve treatment comfort and effectiveness.

[0024] 2. The treatment time and temperature level can be cycled through the button input module. The set parameters are displayed in real time by the digital tube and status indicator lights, making the operation simple and intuitive for users and improving the user experience.

[0025] 3. Equipped with a safety protection module, using a mechanical or electronic tilt protection switch, the heating power is automatically cut off when the tilt angle of the equipment exceeds the set threshold, effectively avoiding safety hazards caused by the equipment tipping over and ensuring the personal safety of users.

[0026] 4. The buzzer alarm module emits a prompt sound when the device is turned on and when treatment ends, reminding the user of the device's operating status and enhancing the convenience and safety of use. Attached Figure Description

[0027] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0028] Figure 1 This is the circuit schematic diagram of this utility model;

[0029] Figure 2 This is the circuit diagram of the single-chip microcomputer U3 of this utility model;

[0030] Figure 3 The power supply and rectification / filtering circuit diagram of this utility model;

[0031] Figure 4 This is a circuit diagram of the heating module of this utility model;

[0032] Figure 5 This is a circuit diagram of the display module of this utility model;

[0033] Figure 6 This is the circuit diagram of the buzzer of this utility model;

[0034] Figure 7 The circuit diagram for the installation protection module of this utility model is shown. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms “first,” “second,” “third,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0038] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] See Figure 1 This invention provides an embodiment of a control circuit for a heat lamp in a physiotherapy device, comprising a power supply module, a control module, a heating module, a key input module, a display module, a buzzer alarm module, and a safety protection module. The specific structure and working principle are as follows:

[0040] Power module:

[0041] The power supply module includes a rectifier bridge U2 and a filter capacitor E1. The rectifier bridge U2 is an MB6SU model rectifier bridge used to convert the input 220V AC power into DC power. The filter capacitor E1 is a 470μF / 16V electrolytic capacitor used to smooth the DC voltage and provide a stable DC power supply for the entire control circuit.

[0042] The power supply module further includes: a resistor-capacitor (RC) step-down circuit for stepping down the input AC power, comprising a current-limiting resistor and a step-down capacitor connected in series; a rectifier circuit connected to the RC step-down circuit for converting the AC power into pulsating DC power; a filter circuit connected to the rectifier circuit for smoothing the pulsating DC power; a voltage regulator circuit connected to the filter circuit for outputting a stable DC voltage to power the control circuit; and a zero-crossing detection circuit for detecting the zero-crossing point of the AC power and providing a zero-crossing signal to the thyristor Q3 trigger circuit to ensure that the thyristor is turned on or off at the zero-crossing point.

[0043] Control module:

[0044] The control module includes a microcontroller U3 and an LED driver chip U1. The microcontroller U3 is an SC8F2892B microcontroller used to receive signals from the key input module, control the power output of the heating module, monitor the temperature, and coordinate the operation of each module. The LED driver chip U1 is a TM1617 chip used to drive the digital tube LED1 and status indicator D1D5 in the display module to display the treatment time and temperature level set by the user.

[0045] Heating module:

[0046] The heating module includes an optocoupler U4 and a silicon controlled rectifier (SCR) Q3. Optocoupler U4 is a MOC3022, and SCR Q3 is a BT136600E_B. The microcontroller U3 drives the SCR Q3 via a PWM signal through optocoupler U4, adjusting the conduction time of the heating element to achieve precise control of the heating power. The heating module has four temperature settings:

[0047] Warm setting: Power 70%, runs for 1 minute, then stops for 25 seconds, repeats continuously;

[0048] Low temperature setting: 80% power, runs for 1 minute, then stops for 15 seconds, repeats continuously;

[0049] Medium temperature setting: 90% power, runs for 1 minute, then stops for 7 seconds, repeats continuously;

[0050] High temperature setting: 100% power, continuous operation.

[0051] The above gears correspond to the status indicator lights D2 (warm), D3 (low temperature), D4 (medium temperature), and D5 (high temperature), respectively.

[0052] Heating control implementation method:

[0053] Optocoupler isolation (U4, MOC3022): Used to isolate low-voltage control circuits (MCU) from high-voltage AC parts to prevent interference.

[0054] When the MCU (U3, SC8F2892B) outputs a high-level signal, the internal LED of the optocoupler conducts, triggering the SCR BT136 to conduct, thus powering the heating lamp. Trigger resistor (R6): limits the optocoupler's output current and protects the SCR gate.

[0055] The heating power is adjusted by controlling the on / off state of the optocoupler through PWM or switching signals; the temperature is adjusted by adjusting the duty cycle through the buttons (KEY1, KEY2).

[0056] Keypad input module:

[0057] The button input module includes buttons KEY1 (time button) and KEY2 (temperature button), which are connected to the input pins of the microcontroller U3 to set the treatment time and temperature level. The specific operation is as follows:

[0058] Time setting: Press the time button KEY1 to cycle through the treatment time. The first press displays 30 minutes, the second press displays 60 minutes, the third press displays "--" (continuous operation), and the fourth press returns to standby mode (displays "00", heating is off).

[0059] Temperature setting: Press the temperature button KEY2 to cycle through the temperature settings in the following order: high temperature (100% power), medium temperature (90% power), low temperature (80% power), and warm temperature (70% power). Press it again to return to the high temperature setting.

[0060] Display module:

[0061] The display module includes a digital tube LED1 and status indicator lights D1-D5, driven by an LED driver chip U1. The digital tube LED1 displays the set treatment time in real time, status indicator lights D1 are the power indicator, and D2-D5 correspond to four temperature levels, indicating the current operating status.

[0062] Buzzer alarm module:

[0063] The buzzer alarm module is connected to the U3 microcontroller and is used for power-on prompts and treatment completion alarms. When the device is powered on, the buzzer sounds once; after the treatment time ends, the buzzer sounds three times, and the digital tube displays "00".

[0064] Security protection module:

[0065] The safety protection module includes a tilt protection switch connected to the microcontroller U3, used to detect the tilting state of the equipment and cut off the power supply to the heating module. In this embodiment, the tilt protection switch can be a mechanical tilt switch of model Rbs070410b (angle) or Rbs070310b (right angle). When the tilt angle of the equipment exceeds the set threshold, the tilt switch triggers a signal to the microcontroller U3, which immediately shuts down the thyristor Q3, cutting off the power supply to the heating element and ensuring safe operation.

[0066] Work process:

[0067] After the device is connected to a 220V AC power supply, the power module converts the AC power to DC power, the buzzer sounds once, the power indicator D1 lights up, and the digital tube LED1 displays "00", indicating that it has entered standby mode. The user sets the treatment time and temperature level via the button input module. The microcontroller U3 adjusts the PWM signal of the heating module according to the input signal, controlling the power output of the heating element. Simultaneously, the display module shows the set parameters in real time. Once treatment begins, the countdown reaches "00", the buzzer sounds three times, and the heating element shuts off. If the device tipes over during operation, the safety protection module immediately cuts off the heating power to prevent safety hazards.

[0068] The medical electromagnetic wave heating lamp control circuit provided in this embodiment has a simple structure and is easy to operate. With multi-level power adjustment and tilt protection functions, it not only meets different treatment needs but also improves the safety of use, and has high practical value.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A physiotherapy lamp control circuit, characterized in that: The application relates to a multifunctional electric heating device, which comprises a power module, a control module, a heating module, a key input module, a display module, a buzzer alarm module and a safety protection module; the control module comprises a single-chip microcomputer U3 and an LED driving chip U1, the single-chip microcomputer U3 is used for processing user input, controlling a baking lamp power and monitoring temperature, and the LED driving chip U1 is used for controlling a digital tube to display user-set temperature and time information; the heating module comprises an optical coupler U4 and a thyristor Q3, receives a PWM signal of the control module, and adjusts a power output of a heating tube; the key input module comprises keys KEY1 and KEY2; KEY1 is configured as a time button, KEY2 is configured as a temperature button, is connected to input pins of the main control module, and is used for setting a treatment time and a temperature gear; the display module comprises a digital tube and a state indicating lamp, is driven by the display LED driving chip U1, and is used for displaying the treatment time and the temperature gear; the buzzer alarm module is connected to the control module and is used for starting-up prompting and treatment end alarm; and the safety protection module is connected to the control module and is used for detecting a heating tube shutdown when the machine is tilted.

2. The control circuit of the physiotherapy instrument baking lamp according to claim 1, characterized in that: The heating module is provided with four temperature gears, and the temperature gears comprise, in sequence according to gradually increasing power, a warm gear, a low-temperature gear, a medium-temperature gear and a high-temperature gear.

3. The control circuit of the physiotherapy instrument baking lamp according to claim 1, characterized in that: The control module controls a conduction state of the heating module through a thyristor to realize adjustment of different power gears.

4. The control circuit of the physiotherapy instrument baking lamp according to claim 3, characterized in that: The treatment time is cyclically switched through a time setting key, and the digital tube LED1 is used for displaying the set treatment time in real time.

5. The control circuit of the physiotherapy instrument baking lamp according to claim 4, characterized in that: The tilt protection switch of the safety protection module is mechanical or electronic, and when a device inclination angle exceeds a set threshold value, the tilt protection switch automatically cuts off a power supply of the heating module.

6. The control circuit of the physiotherapy instrument baking lamp according to claim 1, characterized in that: The power module comprises: a resistance-capacitance voltage reduction circuit used for reducing input alternating current, comprising a current-limiting resistor and a voltage reduction capacitor connected in series; a rectifier circuit connected with the resistance-capacitance voltage reduction circuit and used for converting alternating current into pulsating direct current; a filter circuit connected with the rectifier circuit and used for carrying out smooth filtering on the pulsating direct current; a voltage stabilization circuit connected with the filter circuit and used for outputting stable direct current voltage to supply power for a control circuit; and a zero-crossing detection circuit used for detecting zero-crossing points of alternating current and providing zero-crossing signals to a thyristor Q3 trigger circuit to ensure that the thyristor is turned on or turned off at the zero-crossing points.

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