Control circuit for a cold and warm bath

Abstract

This application discloses a control circuit for a cooling and heating ice bath machine, including a cabinet temperature acquisition module, a main control module, and a load drive module. The cabinet temperature acquisition module is used to acquire the current temperature of the ice bath machine in real time. The control signal input terminal of the main control module is connected to the output terminal of the cabinet temperature acquisition module. If the current temperature is greater than the preset cooling temperature of the main control module, a cooling signal is output; if the current temperature is less than the preset heating temperature of the main control module, a heating signal is output. The output terminal of the load drive module is used to execute the cooling mode when receiving the cooling signal, and the output terminal of the load drive module is also used to execute the heating mode when receiving the heating signal. This application can automatically switch the cooling mode and heating mode of the ice bath machine according to the current temperature of the ice bath machine, so that the internal temperature of the ice bath machine can be stabilized within the set range. Furthermore, it can avoid unnecessary energy waste, effectively reduce energy consumption, and improve energy utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of ice bath machine technology, and in particular to a control circuit for a hot and cold ice bath machine. Background Technology

[0002] An ice bath machine is a physiotherapy device that helps the body recover quickly by immersing in cold water. It was initially used by professional athletes for post-competition recovery and is now gradually becoming popular in the fields of fitness and health management. Its principle is mainly to use alternating hot and cold stimulation to induce vasoconstriction and vasodilation, thereby promoting blood circulation, relieving muscle inflammation and accelerating the removal of metabolic waste, providing a scientific and efficient solution for sports recovery and health management.

[0003] Current ice bath machines mainly operate in a constant power cooling or heating mode, which has low temperature control accuracy and makes it difficult to dynamically adjust the working mode according to changes in ambient temperature and load status. Furthermore, they continue to operate at a fixed power after reaching the set temperature, which results in significant energy consumption. Utility Model Content

[0004] To address the technical problem that current ice bath machines struggle to dynamically adjust their operating modes based on changes in ambient temperature and load conditions, resulting in low temperature control accuracy and high energy consumption, this utility model provides a control circuit for a hot and cold ice bath machine.

[0005] To achieve the above objectives, this utility model is implemented by the following technical solution: A control circuit for a hot and cold bath machine includes: A cabinet temperature acquisition module, the input terminal of which is electrically connected to a cabinet temperature probe, is used to acquire the current temperature of the ice bath machine in real time; The main control module has its control signal input terminal connected to the output terminal of the cabinet temperature acquisition module. If the current temperature is greater than the preset cooling temperature of the main control module, a cooling signal is output; if the current temperature is less than the preset heating temperature of the main control module, a heating signal is output. The load drive module has its input terminal connected to the control signal output terminal of the main control module. The output terminal of the load drive module is used to execute the cooling mode when a cooling signal is received, and the output terminal of the load drive module is also used to execute the heating mode when a heating signal is received.

[0006] By adopting the above technical solution, the main control module 100 can monitor the current temperature information of the ice bath machine in real time through the cabinet temperature acquisition module 200, and automatically switch the cooling mode and heating mode of the ice bath machine according to the current temperature of the ice bath machine, so that the internal temperature of the ice bath machine can be stabilized within the set range. Secondly, since it can automatically switch modes according to the current temperature, compared with traditional constant power cooling or refrigeration equipment, unnecessary energy waste can be avoided, energy consumption can be effectively reduced, and energy utilization efficiency can be improved.

[0007] The control circuit of the hot and cold bath machine described above also includes a power supply module. The input terminal of the power supply module is connected to the mains power supply, and the power supply module is used to provide a stable operating voltage for the control system.

[0008] As described above, the control circuit for a hot and cold bath machine includes a power supply module comprising: A rectifier unit, the input terminal of which is connected to the mains power, is used to convert the mains power into 12V DC power; A step-down unit, the input of which is connected to the output of the rectifier unit, is used to step down 12V DC to 5V DC.

[0009] As described above, the control circuit of a hot and cold water bath machine includes a rectifier unit comprising a transformer U2 and a rectifier bridge U3. The live wire of the mains power supply is connected to the first end of the primary winding of the transformer U2, the neutral wire of the mains power supply is connected to the second end of the primary winding of the transformer U2, the first end of the secondary winding of the transformer U2 is connected to the first AC input terminal of the rectifier bridge U3, the second end of the secondary winding of the transformer U2 is connected to the second AC input terminal of the rectifier bridge U3, the positive output terminal of the rectifier bridge U3 is connected to the input terminal of the step-down unit, and the negative output terminal of the rectifier bridge U3 is grounded.

[0010] As described above, the control circuit of a hot and cold bath machine includes a step-down unit comprising a linear regulator U5 and an inductor L1. The output terminal of the rectifier unit is connected to the input terminal of the linear regulator U5. The ground terminal of the linear regulator U5 is grounded. The output terminal of the linear regulator U5 is connected to one end of the inductor L1. The other end of the inductor L1 outputs 5V DC power.

[0011] As described above, the control circuit for a hot and cold water bath machine includes a cabinet temperature acquisition module comprising a cabinet temperature probe interface J3, a capacitor C7, a resistor R4, and a resistor R3. The first power output terminal of the power module is connected to the second output terminal of the cabinet temperature probe interface J3. The first output terminal of the cabinet temperature probe interface J3 is also connected to ground via the resistor R4. The second output terminal of the cabinet temperature probe interface J3 is connected to one end of the capacitor C7. The other end of the capacitor C7 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the control signal input terminal of the main control module.

[0012] As described above, in the control circuit of a hot and cold bath machine, the load drive module includes: The drive unit has its input terminal connected to the control signal output terminal of the main control module. The drive unit is used to output a cooling drive signal when it receives a cooling signal, and it is also used to output a heating drive signal when it receives a heating signal. The load unit has its input terminal connected to the output terminal of the drive unit. The load unit is used to execute the cooling mode when it receives a cooling drive signal, and it is also used to execute the heating mode when it receives a heating drive signal.

[0013] As described above, the control circuit for a hot and cold water bath machine includes a load unit comprising relays RE1, RE2, and RE3. The first output terminal of the drive unit is connected to the first coil terminal of relay RE1. The second coil terminal of relay RE1 is connected to the first output terminal of the power module. The common terminal of relay RE1 is connected to the live wire of the mains power supply. The normally open terminal of relay RE1 is electrically connected to a four-way valve. The second output terminal of the drive unit is connected to the first coil terminal of relay RE2. The second coil terminal of relay RE2 is connected to the first output terminal of the power module. The common terminal of relay RE2 is connected to the live wire of the mains power supply. The normally open terminal of relay RE2 is electrically connected to the compressor. The third output terminal of the drive unit is connected to the first coil terminal of relay RE3. The second coil terminal of relay RE3 is connected to the first output terminal of the power module. The common terminal of relay RE3 is connected to the live wire of the mains power supply. The normally open terminal of relay RE3 is electrically connected to a water pump.

[0014] The control circuit of the hot and cold bath machine described above also includes: The display module has its display signal terminal connected to the display signal terminal of the main control module, and the display module is used to display the working status of the ice bath machine.

[0015] The control circuit for a hot and cold bath machine as described above, wherein the display module includes: The display driving unit has its input terminal connected to the display signal terminal of the main control module; A digital tube display unit, the input terminal of which is connected to the output terminal of the display driving unit, is used to display the working status of the ice bath machine.

[0016] Compared with the prior art, the control circuit of the hot and cold water bath machine proposed in this utility model has the following beneficial effects: 1. The main control module 100 can monitor the current temperature information of the ice bath machine in real time through the cabinet temperature acquisition module 200, and automatically switch the cooling mode and heating mode of the ice bath machine according to the current temperature of the ice bath machine, so that the internal temperature of the ice bath machine can be stabilized within the set range; secondly, since it can automatically switch modes according to the current temperature, compared with traditional constant power cooling or cooling equipment, it can avoid unnecessary energy waste, effectively reduce energy consumption, and improve energy utilization efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a block diagram illustrating the circuit principle structure of this utility model; Figure 2 This is the circuit schematic diagram of the power module of this utility model; Figure 3 This is a circuit diagram of the cabinet temperature acquisition module of this utility model; Figure 4 This is the circuit schematic diagram of the main control module of this utility model; Figure 5 This is a schematic diagram of the driving unit circuit of this utility model; Figure 6 This is a schematic diagram of the load unit circuit of this utility model; Figure 7 This is a schematic diagram of the display driving unit circuit of this utility model; Figure 8 This is a schematic diagram of the digital tube display unit circuit of this utility model; Figure 9 This is a circuit diagram of the button module of this utility model. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Specific embodiments, combined with Figures 1 to 9 As shown, the technical solution of this utility model is further illustrated. A control circuit for a cooling and heating ice bath machine includes a main control module 100, a cabinet temperature acquisition module 200, and a load drive module 300. The input terminal of the cabinet temperature acquisition module 200 is electrically connected to a cabinet temperature probe. The cabinet temperature acquisition module 200 is used to acquire the current temperature of the ice bath machine in real time. The control signal input terminal of the main control module 100 is connected to the output terminal of the cabinet temperature acquisition module 200. If the current temperature is greater than the preset cooling temperature of the main control module 100, a cooling signal is output; if the current temperature is less than the preset heating temperature of the main control module 100, a heating signal is output. The input terminal of the load drive module 300 is connected to the control signal output terminal of the main control module 100. The output terminal of the load drive module 300 is used to execute the cooling mode when receiving the cooling signal, and the output terminal of the load drive module 300 is also used to execute the heating mode when receiving the heating signal.

[0021] In this embodiment, the main control module 100 can monitor the current temperature information of the ice bath machine in real time through the cabinet temperature acquisition module 200, and automatically switch the cooling mode and heating mode of the ice bath machine according to the current temperature of the ice bath machine, so that the internal temperature of the ice bath machine can be stabilized within the set range. Secondly, since it can automatically switch modes according to the current temperature, compared with traditional constant power cooling or refrigeration equipment, unnecessary energy waste can be avoided, energy consumption can be effectively reduced, and energy utilization efficiency can be improved.

[0022] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a power supply module 400, the input terminal of which is connected to the mains power supply, and the power supply module 400 is used to provide a stable operating voltage for the control system.

[0023] In a preferred embodiment, the power module 400 includes a rectifier unit 410 and a step-down unit 420. The input terminal of the rectifier unit 410 is connected to the mains power and is used to convert the mains power into 12V DC power. The input terminal of the step-down unit 420 is connected to the output terminal of the rectifier unit 410 and is used to step down the 12V DC power to 5V DC power.

[0024] In this embodiment, the power module 400 converts mains power into DC power through the rectifier unit 410, and then outputs stable 5V DC power through the step-down unit 420. This not only provides energy for 5V powered devices, but also simplifies the power supply design of the devices and reduces R&D costs.

[0025] Alternatively, the rectifier unit 410 includes a transformer U2 and a rectifier bridge U3. The live wire of the mains power supply is connected to the first end (i.e., pin 1) of the primary winding of the transformer U2, the neutral wire of the mains power supply is connected to the second end (i.e., pin 1) of the primary winding of the transformer U2, the first end (i.e., pin 3) of the secondary winding of the transformer U2 is connected to the first AC input terminal (i.e., AC2 terminal) of the rectifier bridge U3, the second end (i.e., pin 4) of the secondary winding of the transformer U2 is connected to the second AC input terminal (i.e., AC1 terminal) of the rectifier bridge U3, the positive output terminal of the rectifier bridge U3 is connected to the input terminal of the step-down unit 420, and the negative output terminal of the rectifier bridge U3 is grounded.

[0026] Alternatively, the step-down unit 420 includes a linear regulator U5 and an inductor L1. The output terminal of the rectifier unit 410 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U5. The ground terminal of the linear regulator U5 is grounded. The output terminal (i.e., SW terminal) of the linear regulator U5 is connected to one end of the inductor L1. The other end of the inductor L1 outputs 5V DC.

[0027] For details, please see the appendix. Figure 2 The mains power (i.e., live wire and neutral wire) is connected to the primary winding of the transformer U2. After being transformed by the transformer U2, the secondary winding converts the high-voltage AC power into low-voltage AC power and outputs it from the secondary winding (i.e., pins 3 and 4). This low-voltage AC power is input to the two AC input terminals of the rectifier bridge U3, and after rectification, it is converted into 12V DC power. Then, it is sent to the step-down unit 420 through its positive and negative output terminals. The 12V DC power output by the rectifier unit 410 is first filtered by the polarized capacitor C1 to reduce voltage fluctuations, and then further filtered and stabilized by the capacitor C2 before being sent to the input terminal of the linear regulator U5. The linear regulator U5 stabilizes and steps down the 12V DC power, and then outputs a stable 5V DC power through the inductor L1. The inductor L1 plays the role of filtering and stabilizing the output current.

[0028] Furthermore, as a preferred embodiment of this solution and not a limitation, the cabinet temperature acquisition module 200 includes a cabinet temperature probe interface J3, a capacitor C7, a resistor R4, and a resistor R3. The first power output terminal (+5V terminal) of the power module 400 is connected to the second output terminal of the cabinet temperature probe interface J3. The first output terminal of the cabinet temperature probe interface J3 is also connected to ground. The second output terminal of the cabinet temperature probe interface J3 is connected to one end of the capacitor C7. The other end of the capacitor C7 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the control signal input terminal (i.e., NTC2 terminal) of the main control module 100.

[0029] Specifically, the 5V DC power output from the first power output terminal (+5V terminal) of the power module 400 powers the external cabinet temperature probe through the second output terminal of the cabinet temperature probe interface J3. The detection signal of the cabinet temperature probe is output through the first output terminal of the cabinet temperature probe interface J3, forming a voltage divider circuit with the grounded resistor R4 to convert the temperature change into a corresponding voltage signal change. This voltage signal is filtered by the capacitor C7 to reduce interference, and then transmitted to the NTC2 control signal input terminal of the main control module 100 after being current-limited by the resistor R3, so that the main control module 100 can calculate the corresponding cabinet temperature based on the received voltage signal.

[0030] In this embodiment, the cabinet temperature acquisition module 200 provides a stable voltage (i.e., +5V) to power the cabinet temperature probe through the power module 400. The temperature change is converted into a voltage signal by the voltage divider circuit formed by the resistor R4. After being filtered by the capacitor C7 and current-limited by the resistor R3, the signal is transmitted to the main control module 100. This not only ensures the accuracy and reliability of temperature acquisition, but also facilitates integration and maintenance due to its simple structure, and can provide accurate temperature basis for equipment control.

[0031] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the load drive module 300 includes a drive unit 310 and a load unit 320. The input terminal of the drive unit 310 is connected to the control signal output terminal of the main control module 100. The drive unit 310 is used to output a cooling drive signal when it receives a cooling signal, and the drive unit 310 is also used to output a heating drive signal when it receives a heating signal. The input terminal of the load unit 320 is connected to the output terminal of the drive unit 310. The load unit 320 is used to execute a cooling mode when it receives a cooling drive signal, and the load unit 320 is also used to execute a heating mode when it receives a heating drive signal.

[0032] In a preferred embodiment, the driving unit 310 includes a driving chip U4, preferably of model ULN2003A.

[0033] In this embodiment, the driver chip U4 is a driver chip with high driving capability, built-in protection and ease of use, which can amplify enough current to control the on and off of relays and buzzers.

[0034] In a preferred embodiment, the load unit 320 includes relays RE1, RE2, and RE3. The first output terminal (OUT1) of the drive unit 310 is connected to the first coil terminal (pin 1) of relay RE1, the second coil terminal (pin 2) of relay RE1 is connected to the second output terminal (+12V terminal) of the power module 400, the common terminal (pin 4) of relay RE1 is connected to the live wire of the mains power supply, and the normally open terminal (pin 3) of relay RE1 is electrically connected to the four-way valve. The second output terminal (OUT2) of the drive unit 310 is connected to the first coil terminal (pin 1) of relay RE2. The second coil terminal (pin 2) of relay RE2 is connected to the first output terminal (+12V) of the power module 400, the common terminal (pin 4) of relay RE2 is connected to the live wire of the mains power supply, and the normally open terminal (pin 3) of relay RE2 is electrically connected to the compressor; the third output terminal (OUT3) of drive unit 310 is connected to the first coil terminal (pin 1) of relay RE3, the second coil terminal (pin 2) of relay RE3 is connected to the first output terminal (+12V) of the power module 400, the common terminal (pin 4) of relay RE3 is connected to the live wire of the mains power supply, and the normally open terminal (pin 3) of relay RE3 is electrically connected to the water pump.

[0035] Specifically, when the main control module 100 receives the current temperature signal collected by the cabinet temperature acquisition module 200, it compares it with the preset temperature of the main control module. If the current temperature of the ice bath machine is greater than the preset cooling temperature, it outputs a cooling signal to the drive unit 310. When the drive unit 310 receives the cooling signal, it outputs a cooling drive signal, specifically: the first output terminal (OUT1 terminal) outputs a low-level signal and the second output terminal (OUT2 terminal) outputs a high-level signal, thereby controlling the four-way valve to open and the compressor to turn on, so that the compressor will start cooling to realize the operation of the cooling mode. If the current temperature of the ice bath machine is lower than the preset heating temperature, a heating signal is output to the drive unit 310. When the drive unit 310 receives the heating signal, it outputs a heating drive signal. Specifically, the first output terminal (OUT1 terminal) outputs a high-level signal, and the second output terminal (OUT2 terminal) also outputs a high-level signal, thereby controlling the four-way valve and the compressor to run simultaneously to achieve the operation of the heating mode.

[0036] It should be noted that the preset cooling temperature in this embodiment is set as the control temperature plus the cooling temperature hysteresis, and the preset heating temperature is set as the control temperature minus the heating temperature hysteresis. In addition, when the cooling mode is executed, if the current temperature of the ice bath is lower than the control temperature, the compressor will stop running, that is, the cooling mode will stop running. When the heating mode is executed, if the current temperature of the ice bath is higher than the control temperature, the compressor will stop running, that is, the heating mode will stop running.

[0037] In addition, the temperature control mentioned above is the internal temperature of the ice bath machine itself, which is set at the factory. The cooling temperature hysteresis and heating temperature hysteresis mentioned above are set by the user according to actual needs. The specific temperature settings are not specifically limited in this implementation.

[0038] It is worth noting that when the above-mentioned ice bath machine switches from cooling mode to heating mode, or from heating mode to cooling mode, the compressor will not start for a period of time before it starts running. This is to avoid damage to the compressor due to large changes in the internal cooling pressure and temperature of the ice bath machine during mode switching.

[0039] In this embodiment, the load drive unit controls the operation of the four-way valve and the compressor respectively through the control signal of the main control module, thereby realizing the automatic switching between cooling mode and heating mode, and stabilizing the temperature inside the ice bath machine within the set temperature range. Secondly, the use of relays to control the four-way valve and the compressor provides electrical isolation between the load end and the control end, effectively avoiding interference and damage to the control circuit by the high voltage and high current load circuit, thereby improving the safety and stability of the entire circuit system.

[0040] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a display module 500, the display signal terminal of which is connected to the display signal terminal of the main control module 100, and the display module 500 is used to display the working status of the ice bath machine.

[0041] In a preferred embodiment, the display module 500 includes a display driving unit 510 and a digital tube display unit 520. The input terminal of the display driving unit 510 is connected to the display signal terminal of the main control module 100, and the input terminal of the digital tube display unit 520 is connected to the output terminal of the display driving unit 510. The digital tube display unit 520 is used to display the working status of the ice bath machine.

[0042] Alternatively, the display driving unit 520 may include a digital display LED driver chip U2, preferably model AIP1628_SOP.

[0043] Specifically, the AIP1628_SOP chip receives signals from the main control module, converts serial data into parallel data, and then controls the corresponding internal drive output channels according to the data signals, thereby driving the digital tube display unit.

[0044] In this embodiment, the precise driving of the digital tube display unit 520 by the AIP1628_SOP chip can reduce power consumption and device losses, and improve the reliability and service life of the overall display system.

[0045] Alternatives are available; see attached diagram. Figure 8 As shown, the digital tube display unit 520 includes multiple digital tubes. The input terminal of the digital tube display unit 520 is connected to the output terminal of the display driving unit 510. When the cabinet temperature probe is short-circuited or the high temperature exceeds the limit, the digital tube unit 520 flashes to display "HH". When the cabinet temperature probe is open-circuited or the low temperature exceeds the limit, the digital tube unit 520 flashes to display "LL".

[0046] The above-mentioned high temperature exceeding the limit is defined as the current temperature being greater than 120℃ or 248℉, and the above-mentioned low temperature exceeding the limit is defined as the current temperature being less than -45℃ or -49℃.

[0047] In this embodiment, the digital tube display unit 520 enables the user to clearly and intuitively understand the working status of the ice bath machine, thereby taking corresponding measures to avoid further damage to the ice bath machine due to user misunderstanding or misoperation.

[0048] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a button module 700, which is electrically connected to the main control module 100 and used for setting parameters. In a preferred embodiment, the button module 700 includes buttons KEY1, KEY2, KEY3, KEY4, and KEY5. Button KEY1 is connected to the first button terminal (i.e., KEY1 terminal) of the main control module 100, button KEY2 is connected to the second button terminal (i.e., KEY2 terminal) of the main control module 100, button KEY3 is connected to the third button terminal (i.e., KEY3 terminal) of the main control module 100, button KEY4 is connected to the fourth button terminal (i.e., KEY4 terminal) of the main control module 100, and button KEY5 is connected to the fifth button terminal (i.e., KEY5 terminal) of the main control module 100. Specifically, button KEY1 is the temperature limit setting button for the ice bath machine, with a parameter setting range of 32.0℉ to 0.0℃; button KEY2 is the temperature limit setting button for the ice bath machine, with a parameter setting range of 122℉ to 50.0℃; button KEY3 is the cooling temperature hysteresis setting button for the ice bath machine, with a parameter setting range of 0.1 to 10.0℃ or 0.2 to 18.0℉; button KEY4 is the heating temperature hysteresis setting button for the ice bath machine, with a parameter setting range of 0.1 to 10.0℃ or 0.2 to 18.0℉; and button KEY5 is the compressor delay start time setting button for the ice bath machine, with a parameter setting range of 0 to 10 minutes.

[0049] In this embodiment, the button module 700 is electrically connected to the main control module through buttons KEY1 to KEY5, etc. When pressed, it generates an electrical signal for the main control module to identify and execute the corresponding function (such as water pump on / off setting). It features intuitive and convenient operation, clear functions, simple circuit, and reliable response, allowing users to easily set equipment parameters.

[0050] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A control circuit for a hot and cold bath machine, characterized in that, include: A cabinet temperature acquisition module, the input terminal of which is electrically connected to a cabinet temperature probe, is used to acquire the current temperature of the ice bath machine in real time; The main control module has its control signal input terminal connected to the output terminal of the cabinet temperature acquisition module. If the current temperature is greater than the preset cooling temperature of the main control module, a cooling signal is output; if the current temperature is less than the preset heating temperature of the main control module, a heating signal is output. The load drive module has its input terminal connected to the control signal output terminal of the main control module. The output terminal of the load drive module is used to execute the cooling mode when a cooling signal is received, and the output terminal of the load drive module is also used to execute the heating mode when a heating signal is received.

2. The control circuit of a hot and cold water bath machine according to claim 1, characterized in that, Also includes: A power supply module, the input terminal of which is connected to the mains power supply, is used to provide a stable operating voltage for the control system.

3. The control circuit of a hot and cold bath machine according to claim 2, characterized in that, The power module includes: A rectifier unit, the input terminal of which is connected to the mains power, is used to convert the mains power into 12V DC power; A step-down unit, the input of which is connected to the output of the rectifier unit, is used to step down 12V DC to 5V DC.

4. The control circuit of a hot and cold bath machine according to claim 3, characterized in that, The rectifier unit includes a transformer U2 and a rectifier bridge U3. The live wire of the mains power supply is connected to the first end of the primary winding of the transformer U2, and the neutral wire of the mains power supply is connected to the second end of the primary winding of the transformer U2. The first end of the secondary winding of the transformer U2 is connected to the first AC input terminal of the rectifier bridge U3, and the second end of the secondary winding of the transformer U2 is connected to the second AC input terminal of the rectifier bridge U3. The positive output terminal of the rectifier bridge U3 is connected to the input terminal of the step-down unit, and the negative output terminal of the rectifier bridge U3 is grounded.

5. The control circuit for a hot and cold bath machine according to claim 3, characterized in that, The step-down unit includes a linear regulator U5 and an inductor L1. The output terminal of the rectifier unit is connected to the input terminal of the linear regulator U5. The ground terminal of the linear regulator U5 is grounded. The output terminal of the linear regulator U5 is connected to one end of the inductor L1. The other end of the inductor L1 outputs 5V DC.

6. The control circuit of a hot and cold bath machine according to claim 2, characterized in that, The cabinet temperature acquisition module includes a cabinet temperature probe interface J3, a capacitor C7, a resistor R4, and a resistor R3. The first power output terminal of the power module is connected to the second output terminal of the cabinet temperature probe interface J3. The first output terminal of the cabinet temperature probe interface J3 is also connected to ground. The second output terminal of the cabinet temperature probe interface J3 is connected to one end of the capacitor C7. The other end of the capacitor C7 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the control signal input terminal of the main control module.

7. The control circuit of a hot and cold bath machine according to claim 2, characterized in that, The load driving module includes: The drive unit has its input terminal connected to the control signal output terminal of the main control module. The drive unit is used to output a cooling drive signal when it receives a cooling signal, and it is also used to output a heating drive signal when it receives a heating signal. The load unit has its input terminal connected to the output terminal of the drive unit. The load unit is used to execute the cooling mode when it receives a cooling drive signal, and it is also used to execute the heating mode when it receives a heating drive signal.

8. The control circuit of a hot and cold bath machine according to claim 7, characterized in that, The load unit includes relays RE1, RE2, and RE3. The first output terminal of the drive unit is connected to the first coil terminal of relay RE1. The second coil terminal of relay RE1 is connected to the first output terminal of the power module. The common terminal of relay RE1 is connected to the live wire of the mains power supply. The normally open terminal of relay RE1 is electrically connected to the four-way valve. The second output of the drive unit is connected to the first coil terminal of relay RE2. The second coil terminal of relay RE2 is connected to the first output terminal of the power module. The common terminal of relay RE2 is connected to the live wire of the mains power supply. The normally open terminal of relay RE2 is electrically connected to the compressor. The third output terminal of the drive unit is connected to the first coil terminal of relay RE3. The second coil terminal of relay RE3 is connected to the first output terminal of the power module. The common terminal of relay RE3 is connected to the live wire of the mains power supply. The normally open terminal of relay RE3 is electrically connected to the water pump.

9. The control circuit of a hot and cold bath machine according to claim 1, characterized in that, Also includes: The display module has its display signal terminal connected to the display signal terminal of the main control module, and the display module is used to display the working status of the ice bath machine.

10. The control circuit of a hot and cold bath machine according to claim 9, characterized in that, The display module includes: The display driving unit has its input terminal connected to the display signal terminal of the main control module; A digital tube display unit, the input terminal of which is connected to the output terminal of the display driving unit, is used to display the working status of the ice bath machine.

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