Insulated and isolated circuit board and foot massage device

Abstract

The utility model provides an insulated and isolated circuit board and a foot massage device. The circuit board comprises a power supply circuit, a zero-cross detection circuit, at least one heating tube control circuit, a massage motor control circuit, a water temperature detection circuit and a microcontroller, the water temperature detection circuit comprises a weak circuit and an optocoupler, and the optocoupler is used for isolating the microcontroller and the weak circuit; the power supply circuit comprises a first power supply unit and a second power supply unit; the first power supply unit is respectively connected with the zero-cross detection circuit, the heating tube control circuit, the massage motor control circuit and the microcontroller; the microcontroller is respectively connected with the zero-cross detection circuit, the heating tube control circuit, the massage motor control circuit and the optocoupler; the second power supply unit is connected with a weak circuit of the water temperature detection circuit; the zero cross detection circuit, the heating tube control circuit and the massage motor control circuit are not provided with optical couplers. The insulation isolation control circuit of the foot massage device circuit board is simplified, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of household electrical appliances, and in particular to an insulated circuit board and a foot bath. Background Art

[0002] Due to safety requirements, it is necessary to keep a distance between the weak current circuit that may be touched by the human body and the strong current circuit in the foot bath to meet the requirements of enhanced insulation isolation.

[0003] The existing solution is to use transformers to form isolation zones between all weak current circuits and all strong current circuits, thereby increasing the distance between all weak current circuits and all strong current circuits to meet the requirements. The control circuit of this solution is complex and the cost is high. Utility Model Content

[0004] In view of this, the present application provides an insulated circuit board and a foot massager to solve the technical problems of the existing foot massager circuit board having a complex control circuit and high cost in order to achieve insulation isolation.

[0005] In a first aspect, an embodiment of the present application provides an insulated and isolated circuit board, which is applied to a foot bath, and includes: a power supply circuit, a zero-crossing detection circuit, at least one heating tube control circuit, a massage motor control circuit, a water temperature detection circuit and a microcontroller; the water temperature detection circuit includes a weak circuit and an optical coupler, and the optical coupler is used to isolate the microcontroller and the weak circuit; the power supply circuit includes a first power supply unit and a second power supply unit, and the first power supply unit is respectively connected to the zero-crossing detection circuit, at least one heating tube control circuit, the massage motor control circuit and the microcontroller; the microcontroller is respectively connected to the zero-crossing detection circuit, the heating tube control circuit, the massage motor control circuit and the optical coupler; the second power supply unit is connected to the weak circuit of the water temperature detection circuit; the zero-crossing detection circuit, the heating tube control circuit and the massage motor control circuit are not provided with an optical coupler.

[0006] This embodiment simplifies the electrical components by simplifying the isolation process of the zero-crossing detection module, the heating tube control module, the massage motor control module and the optocoupler; the power supply module and the water temperature detection module are optimized to isolate the water temperature detection circuit that may be contacted by the human body from the strong circuit. Compared with the traditional insulation scheme, the number of isolation components is reduced and the cost is reduced.

[0007] In one possible implementation, the first power supply unit includes: a first high-voltage side winding, a first low-voltage side winding and a voltage conversion circuit, the first end of the first low-voltage side winding is connected to the output end of the first voltage through a first lead, the input end of the voltage conversion circuit is connected to the output end of the first voltage, and the second end of the first low-voltage side winding is grounded through a second lead; the output end of the voltage conversion circuit outputs a second voltage, the first voltage is 12V, and the second voltage is 5V.

[0008] In one possible implementation, the output end of the first voltage of the first power supply unit is connected to the massage motor control circuit; the output end of the voltage conversion circuit of the first power supply unit is respectively connected to the zero-crossing detection circuit, at least one heating tube control circuit and the microcontroller.

[0009] In one possible implementation, the second power supply unit includes: a second high-voltage side winding, a second low-voltage side winding, a first diode, an electrolytic capacitor and a first resistor; the first end of the second low-voltage side winding is connected to the anode of the first diode; the cathode of the first diode is respectively connected to the first end of the electrolytic capacitor, the first end of the first resistor and the output end of the third voltage; the second end of the second low-voltage side winding, the second end of the electrolytic capacitor and the second end of the first resistor are all grounded; the output end of the third voltage outputs a third voltage of 5V.

[0010] In one possible implementation, the circuit board also includes: a second resistor and a third resistor; the first end of the second resistor is connected to the microcontroller; the second end of the second resistor is respectively connected to the first end of the third resistor and the collector of the optocoupler; the second end of the third resistor is connected to the output end of the voltage conversion circuit.

[0011] In one possible implementation, the weak circuit includes: a first temperature detection unit, a second temperature detection unit, a single-chip microcomputer and a fourth resistor; the first end of the fourth resistor is connected to the output end of the third voltage; the second end of the fourth resistor is connected to the anode of the optocoupler; the single-chip microcomputer is respectively connected to the output end of the third voltage, the cathode of the optocoupler, the first temperature detection unit and the second temperature detection unit.

[0012] In one possible implementation, the massage motor control circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first capacitor, a second capacitor, a first bidirectional thyristor, a first thermistor, a first transistor, a second diode, a bridge rectifier diode and a thermistor temperature sensor;

[0013] The first end of the fifth resistor, the first end of the first bidirectional thyristor and the first end of the first capacitor are all connected to the output end of the first voltage; the second end of the fifth resistor is connected to the first end of the seventh resistor and the first end of the first bidirectional thyristor, and the second end of the seventh resistor is connected to the first end of the eighth resistor; the second end of the eighth resistor is connected to the collector of the first transistor, and the gate of the first transistor is connected to the first end of the ninth resistor and the first end of the tenth resistor; the second end of the ninth resistor is connected to the microcontroller; the second end of the tenth resistor and the emitter of the second transistor are both grounded;

[0014] The second end of the first capacitor is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the first end of the first thermistor; the second end of the first bidirectional thyristor is connected to the first end of the first thermistor; the second end of the first thermistor is respectively connected to the anode of the second diode and the first port of the bridge rectifier diode; the cathode of the second diode is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is respectively connected to the first end of the second capacitor, the first end of the thirteenth resistor and the microcontroller; the second end of the second capacitor and the second end of the thirteenth resistor are both grounded;

[0015] The second port of the bridge rectifier diode is connected to the first end of the thermistor temperature sensor, and the fourth port of the bridge rectifier diode is connected to the second end of the thermistor temperature sensor.

[0016] In one possible implementation, the zero-crossing detection circuit includes: a third diode, a fourteenth resistor, a fifteenth resistor, a third capacitor and a sixteenth resistor; the anode of the third diode is connected to a microcontroller; the cathode of the third diode is connected to the first end of the fourteenth resistor; the second end of the fourteenth resistor is connected to the first end of the fifteenth resistor; the second end of the fifteenth resistor is respectively connected to the microcontroller, the first end of the third capacitor and the first end of the sixteenth resistor, and the second end of the third capacitor and the second end of the sixteenth resistor are both grounded.

[0017] In a possible implementation, the heating tube control circuit includes: a seventeenth resistor, an eighteenth resistor, a second triode, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second bidirectional thyristor and a second thermistor;

[0018] The first end of the seventeenth resistor is connected to the microcontroller; the second end of the seventeenth resistor is respectively connected to the first end of the eighteenth resistor and the gate of the second transistor; the second end of the eighteenth resistor and the emitter of the second transistor are both grounded; the collector of the second transistor is connected to the first end of the nineteenth resistor; the second end of the nineteenth resistor is connected to the first end of the twentieth resistor; the second end of the twentieth resistor is respectively connected to the first end of the twenty-first resistor and the first end of the second bidirectional thyristor; the second end of the twenty-first resistor is respectively connected to the first end of the second bidirectional thyristor and the first end of the second thermistor; the second end of the second bidirectional thyristor is connected to the second end of the second thermistor.

[0019] In a second aspect, an embodiment of the present application provides a foot bath, comprising the insulated and isolated circuit board of an embodiment of the present application.

[0020] The present application simplifies the insulation isolation control circuit of the foot bath circuit board and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of an insulated and isolated circuit board provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of a water temperature detection circuit provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of a first temperature detection unit provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the connection between the microcontroller and the optocoupler provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of a massage motor control circuit provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of a zero-crossing detection circuit provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of a first heating tube control circuit provided in an embodiment of the present application.

[0029] Figure ID:

[0030] 101: power supply circuit; 102: zero-crossing detection circuit; 103: first heating tube control circuit;

[0031] 104: second heating tube control circuit; 105: massage motor control circuit;

[0032] 106: water temperature detection circuit; 107: microcontroller; 108: first power supply unit;

[0033] 109: second power supply unit; 110: weak circuit; 111: optical coupler;

[0034] H1: first high-voltage side winding; L1: first low-voltage side winding; 112: voltage conversion circuit;

[0035] H2: second high-voltage side winding; L2: second low-voltage side winding; D1: first diode;

[0036] EC1: electrolytic capacitor; R1: first resistor; R2: second resistor; R3: third resistor;

[0037] U1: single chip microcomputer; R4: fourth resistor; R5: fifth resistor; R6: sixth resistor;

[0038] R7: seventh resistor; R8: eighth resistor; R9: ninth resistor; R10: tenth resistor;

[0039] R11: 11th resistor; R12: 12th resistor; R13: 13th resistor;

[0040] C1: first capacitor; C2: second capacitor; BCR1: first bidirectional thyristor;

[0041] RB1: first thermistor; Q1: first transistor; D2: second diode;

[0042] B1: bridge rectifier diode; MOT: thermistor temperature sensor;

[0043] D3: the third diode; R14: the fourteenth resistor; R15: the fifteenth resistor;

[0044] C3: the third capacitor; R16: the sixteenth resistor; R17: the seventeenth resistor;

[0045] R18: 18th resistor; Q2: 2nd transistor; R19: 19th resistor;

[0046] R20: 20th resistor; R21: 21st resistor;

[0047] BCR2: second bidirectional thyristor; RB2: second thermistor;

[0048] R22: the 22nd resistor; R23: the 23rd resistor; C4: the 4th capacitor;

[0049] NTC: Thermistor. DETAILED DESCRIPTION

[0050] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0051] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0052] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0053] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0054] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0055] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0056] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0057] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0058] First, the design concept of the embodiments of the present application is briefly introduced.

[0059] The circuit board of an existing foot massager usually includes: a power supply circuit, a zero-crossing detection circuit, at least one heating tube control circuit, a massage motor control circuit, a water temperature detection circuit and a microcontroller. Among them, the water temperature detection circuit is a circuit that the human body may touch. Since the water temperature detection circuit is connected to other circuits, all circuits need to meet the requirement of reinforced insulation 8mm creepage distance with the power supply circuit. This results in many circuit components, complex circuits and high costs.

[0060] In order to solve the above technical problems, the present application separates the water temperature detection circuit that may be touched by the human body, and only needs to distance this part of the circuit from the strong current circuit to meet the requirements, thereby simplifying the control circuit and reducing costs.

[0061] After introducing the application scenarios and design concepts of the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described below.

[0062] like Figure 1As shown, the embodiment of the present application provides an insulated and isolated circuit board, which is applied to a foot bath, including: a power supply circuit 101, a zero-crossing detection circuit 102, a first heating tube control circuit 103, a second heating tube control circuit 104, a massage motor control circuit 105, a water temperature detection circuit 106 and a microcontroller 107; the water temperature detection circuit 106 includes a weak circuit 110 and an optical coupler 111, and the optical coupler is used to isolate the microcontroller 107 and the weak circuit 110; the power supply circuit 101 includes a first power supply unit 108 and a second power supply unit 109, and the first power supply unit 108 is connected to the zero-crossing detection circuit 102, the first heating tube control circuit 103, the second heating tube control circuit 104, the massage motor control circuit 105, the water temperature detection circuit 106 and the ... Circuit 102, the first heating tube control circuit 103, the second heating tube control circuit 104, the massage motor control circuit 105 and the microcontroller 107; the microcontroller 107 is respectively connected to the zero-crossing detection circuit 102, the first heating tube control circuit 103, the second heating tube control circuit 104, the massage motor control circuit 105 and the optical coupler 111; the second power supply unit 109 is connected to the weak circuit 110 of the water temperature detection circuit 106; the zero-crossing detection circuit 102, the first heating tube control circuit 103, the second heating tube control circuit 104 and the massage motor control circuit 105 are not provided with an optical coupler.

[0063] In this embodiment, a transformer output (a second power supply unit) is added to the power supply circuit, which is specifically used for supplying the water temperature detection circuit, so that the water temperature detection circuit is independent, and the water temperature detection circuit and the microcontroller are isolated by an optocoupler; at the same time, the isolation of the optocouplers and peripheral components of other circuits can be simplified, thereby achieving the technical advantages of fewer circuit elements, simple circuits and low costs.

[0064] like Figure 2 As shown, the first power supply unit includes: a first high-voltage side winding H1, a first low-voltage side winding L1 and a voltage conversion circuit 112, the first end of the first low-voltage side winding L1 is connected to the output end of the first voltage through a first lead, and the input end of the voltage conversion circuit 112 is connected to the output end of the first voltage; the second end of the first low-voltage side winding L1 is grounded through a second lead; the output end of the voltage conversion circuit outputs a second voltage, wherein the first voltage is 12V and the second voltage is 5V.

[0065] Among them, the output end of the first voltage of the first power supply unit is connected to the massage motor control circuit; the output end of the voltage conversion circuit of the first power supply unit is respectively connected to the zero-crossing detection circuit, at least one heating tube control circuit and the microcontroller.

[0066] like Figure 2As shown, the second power supply unit includes: a second high-voltage side winding H2, a second low-voltage side winding L2, a first diode D1, an electrolytic capacitor EC1 and a first resistor R1; the first end of the second low-voltage side winding L2 is connected to the anode of the first diode D1; the cathode of the first diode D1 is respectively connected to the first end of the electrolytic capacitor EC1, the first end of the first resistor R1 and the output end of the third voltage; the second end of the second low-voltage side winding L2, the second end of the electrolytic capacitor EC1 and the second end of the first resistor R1 are all grounded; the output end (VDD) of the third voltage outputs a third voltage of 5V.

[0067] like Figure 3 As shown, the weak circuit includes: a first temperature detection unit, a second temperature detection unit, a single-chip microcomputer U1 and a fourth resistor R4; the first end of the fourth resistor R4 is connected to the output end VDD of the third voltage; the second end of the fourth resistor R4 is connected to the anode of the optocoupler 111; the single-chip microcomputer U1 is respectively connected to the output end VDD of the third voltage, the cathode of the optocoupler 111, the first temperature detection unit and the second temperature detection unit.

[0068] Figure 4 : is a circuit diagram of the first temperature detection unit; wherein the circuit structures of the first temperature detection unit and the second temperature detection unit are the same. The first temperature detection unit and the second temperature detection unit of this embodiment both adopt conventional temperature detection circuits, which will not be described in detail here.

[0069] like Figure 5 As shown, the circuit board also includes: a second resistor R2 and a third resistor R3; the first end of the second resistor R2 is connected to the pin CX of the microcontroller; the second end of the second resistor R2 is respectively connected to the first end of the third resistor R3 and the collector of the optocoupler 111; the second end of the third resistor R3 is connected to the output end (+5V) of the voltage conversion circuit.

[0070] In this embodiment, the weak circuit of the water temperature detection circuit is a circuit that may be touched by the human body. The distance between the weak circuit and the microcontroller is made to meet the requirement of 8mm creepage distance of reinforced insulation through optical coupling, so that the water temperature detection circuit meets the safety requirements.

[0071] like Figure 6 As shown, the massage motor control circuit includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a first capacitor C1, a second capacitor C2, a first bidirectional thyristor BCR1, a first thermistor RB1, a first transistor Q1, a second diode D2, a bridge rectifier diode B1 and a thermistor temperature sensor MOT;

[0072] The first end of the fifth resistor R5, the first end of the first bidirectional thyristor BCR1 and the first end of the first capacitor C1 are all connected to the output end (12V) of the first voltage; the second end of the fifth resistor R5 is connected to the first end of the seventh resistor R7 and the first end of the first bidirectional thyristor BCR1, and the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8; the second end of the eighth resistor R8 is connected to the collector of the first transistor Q1, and the gate of the first transistor Q1 is connected to the first end of the ninth resistor R9 and the first end of the tenth resistor R10; the second end of the ninth resistor R9 is connected to the pin SCR3 of the microcontroller; the second end of the tenth resistor R10 and the emitter of the first transistor Q1 are both grounded;

[0073] The second end of the first capacitor C1 is connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected to the first end of the first thermistor RB1; the second end of the first bidirectional thyristor BCR1 is connected to the first end of the first thermistor RB1; the second end of the first thermistor RB1 is respectively connected to the anode of the second diode D2 and the first port of the bridge rectifier diode B1; the cathode of the second diode D2 is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12, the second end of the twelfth resistor R12 is respectively connected to the first end of the second capacitor C2, the first end of the thirteenth resistor R13 and the interrupt pin INT1 of the microcontroller; the second end of the second capacitor C2 and the second end of the thirteenth resistor R13 are both grounded;

[0074] The second port of the bridge rectifier diode B1 is connected to the first end of the thermistor temperature sensor MOT, and the fourth port of the bridge rectifier diode B1 is connected to the second end of the thermistor temperature sensor MOT.

[0075] In this embodiment, the massage motor control circuit is not provided with an optocoupler, the circuit is simple, and the number of components is small.

[0076] like Figure 7 As shown, the zero-crossing detection circuit includes: a third diode D3, a fourteenth resistor R14, a fifteenth resistor R15, a third capacitor C3 and a sixteenth resistor R16; the anode of the third diode D3 is connected to the pin ZERO of the microcontroller; the cathode of the third diode D3 is connected to the first end of the fourteenth resistor R14; the second end of the fourteenth resistor R14 is connected to the first end of the fifteenth resistor R15; the second end of the fifteenth resistor R15 is respectively connected to the interrupt pin INT of the microcontroller, the first end of the third capacitor C3 and the first end of the sixteenth resistor R16, and the second end of the third capacitor C3 and the second end of the sixteenth resistor R16 are both grounded.

[0077] In this embodiment, the zero-crossing detection circuit is not provided with an optical coupler, the circuit is simple, and the number of components is small.

[0078] like Figure 8 As shown, the first heating tube control circuit includes: a seventeenth resistor R17, an eighteenth resistor R18, a second transistor Q2, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a second bidirectional thyristor BCR2 and a second thermistor RB2;

[0079] The first end of the seventeenth resistor R17 is connected to the pin SCR1 of the microcontroller; the second end of the seventeenth resistor R17 is respectively connected to the first end of the eighteenth resistor R18 and the gate of the second transistor Q2; the second end of the eighteenth resistor R18 and the emitter of the second transistor Q2 are both grounded; the collector of the second transistor Q2 is connected to the first end of the nineteenth resistor R19; the second end of the nineteenth resistor R19 is connected to the first end of the twentieth resistor R20; the second end of the twentieth resistor R20 is respectively connected to the first end of the twenty-first resistor R21 and the first end of the second bidirectional thyristor BCR2; the second end of the twenty-first resistor R21 is respectively connected to the first end of the second bidirectional thyristor BCR2 and the first end of the second thermistor RB2; the second end of the second bidirectional thyristor BCR2 is connected to the second end of the second thermistor RB2.

[0080] In this embodiment, the structure of the second heating tube control circuit is the same as that of the first heating tube control circuit.

[0081] In this embodiment, neither the first heating tube control circuit nor the second heating tube control circuit is provided with an optical coupler, so the circuit is simple and has fewer components.

[0082] Based on the same inventive concept, an embodiment of the present application provides a foot bath, including the insulated and isolated circuit board of the embodiment of the present application.

[0083] Since the footbath of this embodiment includes the insulated and isolated circuit board of the embodiment of this application, it has the technical advantages of the insulated and isolated circuit board of the embodiment of this application: fewer components and lower cost.

[0084] In addition, although illustrative embodiments are described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., combinations of schemes across various embodiments), adjustments, or variations based on the present disclosure. The elements in the claims are to be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the continuation of this application. In addition, the steps of the disclosed methods may be modified in any way, including by reordering steps or inserting or deleting steps. Therefore, it is intended that the description be viewed merely as an example, with the true scope being represented by the following claims and their full range of equivalents.

[0085] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more aspects thereof) may be used in combination with each other. After reading the above description, other embodiments may be used by a person of ordinary skill in the art, for example. Moreover, in the above detailed description, various features may be combined together to simplify the present disclosure. This should not be interpreted as intending that the disclosed features that are not requested for protection are essential to any claim. Therefore, the following claims are incorporated into the specific implementation as examples or embodiments, wherein each claim itself is a separate embodiment, and it is expected that these embodiments may be combined with each other in various combinations or permutations. The scope of the present utility model should be determined with reference to the attached claims and the full scope of equivalents given by these claims.

Claims

1. An insulated circuit board, used in a foot bath, characterized in that: include: A power supply circuit, a zero-crossing detection circuit, at least one heating tube control circuit, a massage motor control circuit, a water temperature detection circuit and a microcontroller; the water temperature detection circuit includes a weak circuit and an optical coupler, and the optical coupler is used to isolate the microcontroller and the weak circuit; the power supply circuit includes a first power supply unit and a second power supply unit, the first power supply unit is respectively connected to the zero-crossing detection circuit, the heating tube control circuit, the massage motor control circuit and the microcontroller; the microcontroller is respectively connected to the zero-crossing detection circuit, the heating tube control circuit, the massage motor control circuit and the optical coupler; the second power supply unit is connected to the weak circuit of the water temperature detection circuit; the zero-crossing detection circuit, the heating tube control circuit and the massage motor control circuit are not provided with an optical coupler.

2. The insulated and isolated circuit board according to claim 1, characterized in that: The first power supply unit includes: a first high-voltage side winding, a first low-voltage side winding and a voltage conversion circuit, the first end of the first low-voltage side winding is connected to the output end of the first voltage through a first lead, the input end of the voltage conversion circuit is connected to the output end of the first voltage, and the second end of the first low-voltage side winding is grounded through a second lead; the output end of the voltage conversion circuit outputs a second voltage; wherein the first voltage is 12V and the second voltage is 5V.

3. The insulated and isolated circuit board according to claim 2, characterized in that: The output end of the first voltage of the first power supply unit is connected to the massage motor control circuit; the output end of the voltage conversion circuit of the first power supply unit is respectively connected to the zero-crossing detection circuit, the heating tube control circuit and the microcontroller.

4. The insulated and isolated circuit board according to claim 2, characterized in that: The second power supply unit includes: a second high-voltage side winding, a second low-voltage side winding, a first diode, an electrolytic capacitor and a first resistor; the first end of the second low-voltage side winding is connected to the anode of the first diode; the cathode of the first diode is respectively connected to the first end of the electrolytic capacitor, the first end of the first resistor and the output end of the third voltage; the second end of the second low-voltage side winding, the second end of the electrolytic capacitor and the second end of the first resistor are all grounded; the output end of the third voltage outputs a third voltage of 5V.

5. The insulated and isolated circuit board according to claim 2, characterized in that: The circuit board also includes: a second resistor and a third resistor; the first end of the second resistor is connected to the microcontroller; the second end of the second resistor is respectively connected to the first end of the third resistor and the collector of the optocoupler; the second end of the third resistor is connected to the output end of the voltage conversion circuit.

6. The insulated and isolated circuit board according to claim 4, characterized in that: The weak circuit includes: a first temperature detection unit, a second temperature detection unit, a single-chip microcomputer and a fourth resistor; the first end of the fourth resistor is connected to the output end of the third voltage; the second end of the fourth resistor is connected to the anode of the optocoupler; the single-chip microcomputer is respectively connected to the output end of the third voltage, the cathode of the optocoupler, the first temperature detection unit and the second temperature detection unit.

7. The insulated and isolated circuit board according to claim 1, characterized in that: The massage motor control circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first capacitor, a second capacitor, a first bidirectional thyristor, a first thermistor, a first transistor, a second diode, a bridge rectifier diode and a thermistor temperature sensor; The first end of the fifth resistor, the first end of the first bidirectional thyristor and the first end of the first capacitor are all connected to the output end of the first voltage; the second end of the fifth resistor is connected to the first end of the seventh resistor and the first end of the first bidirectional thyristor, and the second end of the seventh resistor is connected to the first end of the eighth resistor; the second end of the eighth resistor is connected to the collector of the first transistor, and the gate of the first transistor is connected to the first end of the ninth resistor and the first end of the tenth resistor; the second end of the ninth resistor is connected to the microcontroller; the second end of the tenth resistor and the emitter of the second transistor are both grounded; The second end of the first capacitor is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the first end of the first thermistor; the second end of the first bidirectional thyristor is connected to the first end of the first thermistor; the second end of the first thermistor is respectively connected to the anode of the second diode and the first port of the bridge rectifier diode; the cathode of the second diode is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is respectively connected to the first end of the second capacitor, the first end of the thirteenth resistor and the microcontroller; the second end of the second capacitor and the second end of the thirteenth resistor are both grounded; The second port of the bridge rectifier diode is connected to the first end of the thermistor temperature sensor, and the fourth port of the bridge rectifier diode is connected to the second end of the thermistor temperature sensor.

8. The insulated and isolated circuit board according to claim 1, characterized in that: The zero-crossing detection circuit includes: a third diode, a fourteenth resistor, a fifteenth resistor, a third capacitor and a sixteenth resistor; the anode of the third diode is connected to the microcontroller; the cathode of the third diode is connected to the first end of the fourteenth resistor; the second end of the fourteenth resistor is connected to the first end of the fifteenth resistor; the second end of the fifteenth resistor is respectively connected to the microcontroller, the first end of the third capacitor and the first end of the sixteenth resistor, and the second end of the third capacitor and the second end of the sixteenth resistor are both grounded.

9. The insulated and isolated circuit board according to claim 1, characterized in that: The heating tube control circuit comprises: a seventeenth resistor, an eighteenth resistor, a second triode, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a second bidirectional thyristor and a second thermistor; The first end of the seventeenth resistor is connected to the microcontroller; the second end of the seventeenth resistor is respectively connected to the first end of the eighteenth resistor and the gate of the second transistor; the second end of the eighteenth resistor and the emitter of the second transistor are both grounded; the collector of the second transistor is connected to the first end of the nineteenth resistor; the second end of the nineteenth resistor is connected to the first end of the twentieth resistor; the second end of the twentieth resistor is respectively connected to the first end of the twenty-first resistor and the first end of the second bidirectional thyristor; the second end of the twenty-first resistor is respectively connected to the first end of the second bidirectional thyristor and the first end of the second thermistor; the second end of the second bidirectional thyristor is connected to the second end of the second thermistor.

10. A foot bath, characterized in that: A circuit board with insulation isolation comprising any one of claims 1-9.

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