Air-heating bath heater and control switch circuit thereof

Abstract

The utility model provides an air heating bath heater and a control switch circuit thereof, the control switch circuit comprises a mechanical switch group, the input end of the mechanical switch group is connected with commercial power, the mechanical switch group comprises a plurality of mechanical switches which are connected in parallel, and one mechanical switch is connected with a freewheel diode in parallel; the power supply circuit is connected with the output end of the mechanical switch group and is used for converting alternating-current commercial power into direct-current power; the control circuit is connected with the output end of the power supply circuit and is powered by the direct current output by the power supply circuit; the functional circuit group is connected with the output end of the control circuit and comprises a plurality of functional circuits in one-to-one correspondence with the mechanical switches; the state detection circuit is connected between the output end of the mechanical switch group and the input end of the control circuit and is used for acquiring an opening and closing state signal of each mechanical switch and transmitting the opening and closing state signal to the control circuit, and the corresponding functional circuit is controlled by the control circuit to work; when all the mechanical switches are turned off, the fly-wheel diodes form a half-wave rectification loop to maintain the work of the power supply circuit.

Description

Technical Field

[0001] This utility model relates to the field of heater technology, and in particular to a fan-heated bathroom heater and its control switch circuit. Background Technology

[0002] Currently, wall switches for bathroom heaters on the market all use a 220V AC mains live wire as the common wire connected to the common pin of the wall switch. The switch button controls the on / off of this live wire to achieve functions such as heating, blowing, ventilation, lighting, and swinging.

[0003] However, for this type of mechanical switch bathroom heater, if you want the MCU control circuit to work in standby mode for a long time, one way is to add a live wire to provide power to the power circuit continuously; another way is to turn on any one of the mechanical switches for heating, blowing, ventilation, lighting, or swing to make the power circuit work, but the power circuit will stop working once all the mechanical switches are turned off.

[0004] In view of this, it is indeed necessary to improve the control switch circuit of the existing fan-heated bathroom heater to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a control switch circuit for a fan-heated bathroom heater. This control switch circuit can continuously supply power to the power circuit after all mechanical switches are turned off, thus solving the problem that existing mechanical switch-type bathroom heaters cannot continuously supply power to the main controller after all mechanical switches are turned off.

[0006] To achieve the above objectives, this utility model provides a control switch circuit for use in a fan-heated bathroom heater, comprising:

[0007] A mechanical switch assembly, the input of which is connected to the mains power, includes multiple mechanical switches connected in parallel, and one of the mechanical switches is connected in parallel with a freewheeling diode;

[0008] The power supply circuit is connected to the output terminal of the mechanical switch assembly and is used to convert AC mains power into DC power.

[0009] The control circuit is connected to the output terminal of the power supply circuit and is powered by the DC power output from the power supply circuit.

[0010] The functional circuit group is connected to the output terminal of the control circuit and includes multiple functional circuits that correspond one-to-one with the mechanical switches.

[0011] The status detection circuit is connected between the output terminal of the mechanical switch group and the input terminal of the control circuit. It is used to collect the open / closed status signal of each mechanical switch and transmit the open / closed status signal to the control circuit, which then controls the corresponding functional circuit to work.

[0012] When all mechanical switches are turned off, the freewheeling diode forms a half-wave rectifier circuit to maintain the operation of the power supply circuit.

[0013] Optionally, the freewheeling diode is configured to be short-circuited when at least one mechanical switch is on, and to be on when all mechanical switches are off.

[0014] Optionally, a rectifier circuit is also included, with its input connected to the output of the mechanical switch assembly and its output connected to the input of the power supply circuit to prevent voltage from the power supply circuit from flowing back into the status detection circuit.

[0015] Optionally, the rectifier circuit includes multiple rectifier diodes, which correspond one-to-one with multiple mechanical switches and are connected in series to the output terminal of each mechanical switch.

[0016] Optionally, the power supply circuit includes a rectifier and filter circuit connected to the output terminal of the mechanical switch group, an AC-DC circuit connected to the output terminal of the rectifier and filter circuit, and a DC-DC circuit connected to the output terminal of the AC-DC circuit.

[0017] Optionally, the rectifier and filter circuit includes a bridge rectifier circuit connected to the output terminal of the mechanical switch group and a filter capacitor connected in parallel to the output terminal of the bridge rectifier circuit.

[0018] Optionally, multiple mechanical switches include a heating switch, a blower switch, a ventilation switch, a lighting switch, and / or a swing switch, with multiple functional circuits respectively connected to the heating device, the blower motor, the ventilation motor, and the lighting.

[0019] Optional, multi-function circuitry includes:

[0020] Temperature feedback circuit is used to detect and feed back the heating parameters of the heating device to the control circuit;

[0021] Digital display circuitry is used to visually output the heating parameters of the heating device;

[0022] Motor drive circuit, used to drive blower motor and ventilation motor.

[0023] Optionally, the status detection circuit includes multiple optocoupler isolation circuits, each driven by its corresponding mechanical switch, used to collect and convert the opening and closing status signals of the mechanical switches into level signals, and transmit the level signals to the control circuit.

[0024] The purpose of this utility model is also to provide a fan-heated bathroom heater that can maintain the operation of the power circuit after all mechanical switches are turned off.

[0025] To achieve the above objectives, this utility model provides a fan-heated bathroom heater, including the aforementioned control switch circuit.

[0026] The beneficial effects of this utility model are: the control switch circuit of this utility model of a fan-heated bathroom heater connects a freewheeling diode in parallel across one of the mechanical switches, so that when all mechanical switches are turned off, the freewheeling diode can be used to form a half-wave rectifier circuit to connect the power supply circuit to the mains power, continuously supplying power to the power supply circuit and maintaining the operation of the power supply circuit, thus solving the problem that existing mechanical switch bathroom heaters cannot continuously supply power to the main control unit after all mechanical switches are turned off. Attached Figure Description

[0027] Figure 1 This is the circuit diagram of the control switch circuit for the air-heated bathroom heater of this utility model.

[0028] Figure label:

[0029] 10-Mechanical switch group, 20-Rectifier circuit, 30-Power supply circuit, 31-Bridge rectifier circuit, 32-AC-DC circuit, 33-DC-DC circuit, 40-Control circuit, 50-Status detection circuit, 51-Optical isolation circuit, 60-Functional circuit group, 61-Temperature feedback circuit, 62-Digital display circuit, 63-Motor drive circuit, 64-Lighting circuit. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, this utility model discloses a fan-heated bathroom heater and a control switch circuit applied to the fan-heated bathroom heater. The control switch circuit includes a mechanical switch group 10, a rectifier circuit 20, a power supply circuit 30, a control circuit 40, a status detection circuit 50, and a functional circuit group 60.

[0032] The mechanical switch group 10 includes multiple mechanical switches connected in parallel, such as heating switches, blower switches, ventilation switches, lighting switches, and / or swing switches. The input terminals of these mechanical switches are all connected to the mains power supply and share the live wire L. Their output terminals are connected to corresponding terminals, supplying power for the corresponding heating, blower, ventilation, lighting, and swing functions. The terminal block arrangement makes connecting and disconnecting the mechanical switches from the subsequent power supply circuit 30 and status detection circuit 50 more convenient and simple. In this embodiment, five mechanical switches are used as an example, but in actual use, the number of mechanical switches and their corresponding functions can be adjusted and changed according to the actual situation, and no limitation is imposed here.

[0033] The power supply circuit 30 is connected to the output terminal of the mechanical switch group 10 and is used to convert AC mains power into DC power. Specifically, the power supply circuit 30 includes a rectifier and filter circuit connected to the output terminal of the mechanical switch group 10, an AC-DC circuit 32 connected to the output terminal of the rectifier and filter circuit, and a DC-DC circuit 33 connected to the output terminal of the AC-DC circuit 32. The rectifier and filter circuit includes a bridge rectifier circuit 31 connected to the output terminal of the mechanical switch group 10 and a filter capacitor EC1 connected in parallel to the output terminal of the bridge rectifier circuit 31. Thus, when AC mains power flows out through the mechanical switch group 10, it first passes through the bridge rectifier circuit 31 and the filter capacitor EC1 for rectification and filtering, initially converting the AC mains power into DC power. Then, it undergoes further AC-DC conversion through the AC-DC circuit 32 to ensure that all AC mains power is converted into DC power (e.g., 24V). Finally, the DC-DC circuit 33 converts the 24V DC power into a stable power signal (e.g., 5V) required by the control circuit 40.

[0034] The input terminal of the control circuit 40 (MCU) is connected to the output terminal of the power supply circuit 30, and is powered by the DC power (such as 5V) output by the power supply circuit 30, enabling the control circuit 40 to work normally.

[0035] The functional circuit group 60 is connected to the output terminal of the control circuit 40 to receive and execute commands issued by the control circuit 40. Optionally, the functional circuit group 60 includes multiple functional circuits corresponding one-to-one with the mechanical switches. These functional circuits are respectively connected to the heating device, the blower motor, the ventilation motor, and the lighting lamp to realize the heating, blowing, ventilation, and lighting functions of the fan-cooled bathroom heater. Preferably, both the blower motor and the ventilation motor can be stepper motors.

[0036] Optionally, the multi-function circuit includes a temperature feedback circuit 61, a digital display circuit 62, and a motor drive circuit 63. The temperature feedback circuit 61 preferably uses an NTC temperature sensor to detect the heating parameters of the heating device and feeds the detection results back to the control circuit 40. The control circuit 40 then issues corresponding commands based on the detection results, such as continuing heating, stopping heating, turning the blower motor on / off, turning the ventilation motor on / off, adjusting the blowing direction / angle, etc.

[0037] The digital display circuit 62 is used to visually output the heating parameters, airflow level, lighting indicators, etc. of the heating device; no limitations are specified here. The motor drive circuit 63 is used to drive the blower motor and the ventilation motor to start, rotate forward and reverse, stop, etc.

[0038] In addition, the control switch circuit of this utility model also includes a lighting circuit 64, which is connected to the output terminal of the mechanical switch corresponding to the lighting function, and is used to light up after the mechanical switch corresponding to the lighting function is turned on, so as to provide the lighting function.

[0039] The state detection circuit 50 is connected between the output terminal of the mechanical switch group 10 and the input terminal of the control circuit 40. It is used to acquire the open / closed state signal of each mechanical switch and transmit the acquired open / closed state signal to the control circuit 40, which then controls the corresponding functional circuit to operate. Optionally, the state detection circuit 50 includes multiple optocoupler isolation circuits 51. Each optocoupler isolation circuit 51 is driven by its corresponding mechanical switch and is used to acquire and convert the open / closed state signal of the corresponding mechanical switch into a level signal, which is then transmitted to the control circuit 40. Each optocoupler isolation circuit 51 includes an optocoupler (e.g., U1 to U5), allowing each optocoupler to acquire the open / closed state of the corresponding mechanical switch and convert it into a high / low level signal, which is then transmitted to the corresponding pin of the control circuit 40 (e.g., QN / CF / HQ / ZM / BF).

[0040] For example, when one of the mechanical switches is closed, the LED of the corresponding optocoupler on that circuit is lit. At this time, the secondary side of the optocoupler will output a high-level signal to the control circuit 40, which will then control the corresponding functional circuits to work, such as turning on the digital display circuit 62, turning on the NTC temperature sensor, turning on the lighting, turning on the blower motor, or turning on the ventilation motor.

[0041] To prevent the optocoupler from being damaged by excessive output voltage from the mechanical switch group 10, each optocoupler isolation circuit 51 also includes voltage divider resistors (such as R2 / R5 / R8 / R11 / R14) and rectifier diodes (such as D6 / D7 / D8 / D9 / D11). The voltage divider resistors can reduce the voltage flowing into the optocoupler, and the rectifier diodes can prevent AC current from the live wire L side from entering the optocoupler, thus protecting the optocoupler.

[0042] To ensure that the voltage output from the mechanical switch group 10 to the state detection circuit 50 is not affected by the voltage of other circuits, the control switch circuit of this invention also includes a rectifier circuit 20 between the mechanical switch group 10 and the power supply circuit 30. The input terminal of the rectifier circuit 20 is connected to the output terminal of the mechanical switch group 10, and the output terminal of the rectifier circuit 20 is connected to the input terminal of the power supply circuit 30. This prevents the voltage flowing into the power supply circuit 30 from flowing back into the state detection circuit 50 and affecting its data acquisition. Preferably, the rectifier circuit 20 includes multiple rectifier diodes (such as D1 to D5), each corresponding to one of the mechanical switches and connected in series with the output terminal of each mechanical switch. This allows the rectifier diodes to conduct the AC power output from the corresponding mechanical switch in the forward direction to the power supply circuit 30, while cutting it off in the reverse direction.

[0043] Because the multiple mechanical switches in the mechanical switch group 10 are connected in parallel, the electrical connection between the power supply circuit 30 and the mains power will be broken after all the mechanical switches are turned off, causing the subsequent control circuit 40 to be unable to be in standby mode. Therefore, in this invention, the mechanical switch group 10 also includes a high-voltage freewheeling diode D10 connected in parallel with one of the mechanical switches. This freewheeling diode D10 is used to form a half-wave rectifier circuit to connect the power supply circuit 30 to the mains power when all the mechanical switches are turned off, so that the mains power supplies power to the power supply circuit 30, maintaining the operation of the power supply circuit 30 and keeping the control circuit 40 in standby mode. Preferably, the high-voltage freewheeling diode D10 is a 1000V / 1A M72 diode to ensure that the AC mains power will not damage the freewheeling diode D10. Of course, in other embodiments, the high-voltage freewheeling diode D10 can also be other models, as long as the voltage of the freewheeling diode is greater than the mains voltage range, which is not limited here.

[0044] Preferably, the freewheeling diode D10 is configured to be short-circuited when at least one mechanical switch is on, and to be on when all mechanical switches are off. When the freewheeling diode D10 is on, AC mains current flows into the freewheeling diode D10 and is half-wave rectified by the freewheeling diode D10 before being transmitted to the power supply circuit 30, keeping the control circuit 40 in a standby state for an extended period. With this configuration, even if all mechanical switches are turned off, the power supply circuit 30 can still operate normally and supply power to the control circuit 40.

[0045] The working principle of the control switch circuit of this utility model of a fan-heated bathroom heater is as follows: When one or more mechanical switches in the mechanical switch group 10 are turned on, one path of the AC mains power supplies the power supply circuit 30 through the corresponding rectifier diode in the rectifier circuit 20. After AC-DC conversion by the power supply circuit 30, it supplies power to the control circuit 40 (MCU) and the functional circuit group 60. The other path of the AC mains power is converted into a high / low level (i.e., square wave signal) through the optocoupler isolation circuit 51 of the status detection circuit 50 and transmitted to the corresponding pin of the control circuit 40. When the control circuit 40 collects the corresponding square wave signal, it identifies and analyzes it, and sends execution commands to the corresponding temperature feedback circuit 61, digital display circuit 62, and motor drive circuit 63 to control their operation. For example, when the mechanical switch corresponding to the lighting function is closed, the lighting circuit 64 lights up. At the same time, the optocoupler ZM corresponding to the lighting function in the status detection circuit 50 collects a high level and sends it to the control circuit 40. After the control circuit 40 recognizes it, it controls the digital display circuit 62 to light up the indicator light, and at the same time, the blower motor and / or ventilation motor (i.e., stepper motor) returns to their original position. When all mechanical switches are turned on (i.e. off), the freewheeling diode D10 and the rectifier diode D5 half-wave rectify the AC signal at the live wire L terminal and output it to the power supply circuit 30 to maintain the normal power supply of the control circuit 40. At this time, if the blower motor and / or the ventilation motor (i.e., the stepper motor) does not return to its original position, the control circuit 40 will control the stepper motor to perform the return function.

[0046] In summary, the control switch circuit of this utility model of a fan-heated bathroom heater connects a freewheeling diode D10 in parallel across one of the mechanical switches. This freewheeling diode D10 forms a half-wave rectifier circuit to connect the power supply circuit 30 to the mains power when all mechanical switches are off, continuously supplying power to the power supply circuit 30 and maintaining its operation. This solves the problem that existing mechanical switch-type bathroom heaters cannot continuously supply power to the main controller after all mechanical switches are turned off.

[0047] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model.

Claims

1. A control switch circuit, applied to a fan-heated bathroom heater, characterized in that, include: A mechanical switch group (10) whose input terminal is connected to the mains power supply includes multiple mechanical switches connected in parallel, and one of the mechanical switches is connected in parallel with a freewheeling diode; The power supply circuit (30) is connected to the output terminal of the mechanical switch group (10) and is used to convert AC mains power into DC power. The control circuit (40) is connected to the output terminal of the power supply circuit (30) and is powered by the DC power output by the power supply circuit (30). The functional circuit group (60) is connected to the output terminal of the control circuit (40) and includes multiple functional circuits that correspond one-to-one with the mechanical switches; A state detection circuit (50) is connected between the output terminal of the mechanical switch group (10) and the input terminal of the control circuit (40). It is used to collect the opening and closing state signal of each mechanical switch and transmit the opening and closing state signal to the control circuit (40), so that the control circuit (40) controls the corresponding functional circuit to work. When all mechanical switches are turned off, the freewheeling diode forms a half-wave rectifier circuit to maintain the operation of the power supply circuit (30).

2. The control switch circuit according to claim 1, characterized in that, The freewheeling diode is configured to be short-circuited when at least one mechanical switch is on, and to be on when all mechanical switches are off.

3. The control switch circuit according to claim 1, characterized in that, It also includes a rectifier circuit (20), the input of which is connected to the output of the mechanical switch group (10), and the output of which is connected to the input of the power supply circuit (30) to prevent the voltage of the power supply circuit (30) from flowing back to the state detection circuit (50).

4. The control switch circuit according to claim 3, characterized in that, The rectifier circuit (20) includes a plurality of rectifier diodes, which correspond one-to-one with a plurality of mechanical switches and are connected in series to the output terminal of each mechanical switch.

5. The control switch circuit according to claim 1, characterized in that, The power supply circuit (30) includes a rectifier and filter circuit connected to the output terminal of the mechanical switch group (10), an AC-DC circuit (32) connected to the output terminal of the rectifier and filter circuit, and a DC-DC circuit (33) connected to the output terminal of the AC-DC circuit (32).

6. The control switch circuit according to claim 5, characterized in that, The rectifier and filter circuit includes a bridge rectifier circuit (31) connected to the output terminal of the mechanical switch group (10) and a filter capacitor connected in parallel to the output terminal of the bridge rectifier circuit (31).

7. The control switch circuit according to claim 1, characterized in that, The plurality of mechanical switches include a heating switch, a blower switch, a ventilation switch, a lighting switch, and / or a swing switch, and the plurality of functional circuits are respectively connected to the heating device, the blower motor, the ventilation motor, and the lighting lamp.

8. The control switch circuit according to claim 7, characterized in that, The multi-channel functional circuitry includes: Temperature feedback circuit (61) is used to detect and feed back the heating parameters of the heating device to the control circuit (40); A digital display circuit (62) is used to visually output the heating parameters of the heating device; The motor drive circuit (63) is used to drive the blower motor and the ventilation motor to work.

9. The control switch circuit according to claim 1, characterized in that, The state detection circuit (50) includes multiple optocoupler isolation circuits (51). Each optocoupler isolation circuit (51) is driven by its corresponding mechanical switch to collect and convert the opening and closing state signal of the mechanical switch into a level signal and transmit the level signal to the control circuit (40).

10. A type of fan-heated bathroom heater, characterized in that, The control switch circuit includes any one of claims 1-9.

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