Bath heater control device

Abstract

The utility model discloses a bath heater control device relates to bath heater control technical field, it includes: conversion control module, its connection in commercial power network, for converting commercial power into direct current and output, peripheral relay module, it includes a plurality of relays for controlling bath heater large current device, controller, its connection in conversion control module and have a plurality of relay output end for connecting relay, relay zero -cross detection module, its connection in commercial power network, for detecting the zero -cross point of alternating current and output detection signal to controller, wherein, controller electric connection has a plurality of bath heater function switch of matching every relay. The application has the effect of improving bath heater use safety.

Description

Technical Field

[0001] This application relates to the field of bathroom heater control technology, and in particular to a bathroom heater control device. Background Technology

[0002] A bathroom heater refers to a light fixture or heating device installed in a bathroom for heating purposes. Because bathroom heaters need to heat up quickly, they require a large current and high voltage to operate, and can be called a high-voltage bathroom heater.

[0003] During and after showering, it is necessary to turn the bathroom heater on and off. At this time, some users may operate it with wet hands, which may lead to the risk of electric shock. Therefore, safety protection measures are needed. Existing solutions include: designing protective features on the control switch to isolate it from the outside, preventing water from entering the switch and thus improving safety. However, after long-term use, the switch structure is prone to damage, and the protective performance is greatly reduced. Therefore, this application proposes a new technical solution. Utility Model Content

[0004] To improve the safety of using bathroom heaters, this application provides a bathroom heater control device.

[0005] This application provides a bathroom heater control device, which adopts the following technical solution:

[0006] A bathroom heater control device, comprising:

[0007] The conversion control module, which is connected to the mains power network, is used to convert mains power into DC power and output it.

[0008] The peripheral relay module includes several relays for controlling the high-current devices in the bathroom heater;

[0009] The controller is connected to the conversion control module and has several relay output terminals for connecting relays;

[0010] The relay zero-crossing detection module is connected to the mains power network and is used to detect the zero-crossing point of the AC power and output a detection signal to the controller.

[0011] The controller is electrically connected to several bathroom heater function switches that match each relay.

[0012] Optionally, the conversion control module includes:

[0013] Fuse F1, one end of which is connected to the live wire of the mains power;

[0014] The rectifier bridge BD1 has one of its two input terminals connected to fuse F1, and the other terminal connected to the neutral wire of the mains power supply.

[0015] The resonant unit has its two ends connected to the two output terminals of the rectifier bridge BD1, which are positive and negative terminals respectively.

[0016] The first filter capacitor C1 is connected in parallel to the resonant unit;

[0017] The management chip SZ1 has VCC, FB, CS, GND, and VIN pins. The VCC pin is connected to the connection point between the resonant unit and the positive terminal of the rectifier bridge BD1, the GND pin is connected to the connection point between the resonant unit and the negative terminal of the rectifier bridge BD1, and there are two FB and two VIN pins.

[0018] Transformer T1 has connection points 1, 2, 4 and 5 on its input side and connection points 10 and 6 on its output side. Connection point 2 is connected to two interconnected VIN pins of the management chip SZ1, and connection point 6 serves as the positive output terminal.

[0019] The peripheral circuit unit includes a current-limiting resistor R01 connected in series with the VCC pin of the management chip SZ1; a second filter capacitor C3, one end of which is connected to the connection point between the VCC pin of the management chip SZ1 and the current-limiting resistor R01, and the other end is connected to the GND pin and the connection point between the resonant unit and the negative terminal of the rectifier bridge BD1; a first diode D1, the positive terminal of which is connected to the two interconnected VIN pins of the management chip SZ1, and the negative terminal of which is connected to the transformer terminal 1; a resistor R6 connected in series with the first diode D1; and resistors RH and RL connected in parallel, with one end of both connected to the management chip. The chip SZ1 has two interconnected FB pins. The other end of the resistor RH is connected to the terminal 5 of the transformer T1, and the other end of the resistor RL is connected to the terminal 4 of the transformer. It also includes a second diode D2, whose positive end is connected to the terminal 5 of the transformer T1, and whose negative end is connected to the connection point between the current limiting resistor R01 and the VCC pin of the management chip SZ1. It also includes a third diode D3, whose negative end is connected to the terminal 10 of the transformer T1, and whose positive end serves as the negative output terminal and is connected to the GND pin of the management chip SZ1. It also includes a resistor S1, one end of which is connected to the CS pin of the management chip SZ1, and the other end is connected to the second filter capacitor C3.

[0020] Optionally, the resonant unit includes a polarized capacitor C2 and an inductor L1 connected in series, with the negative terminal of the polarized capacitor C2 connected to the negative terminal of the rectifier bridge BD1.

[0021] Optionally, it also includes two sets of RC units, one RC unit connected in series with the negative terminal of the first diode D1, and the other RC unit connected at one end to the positive terminal of the third diode D3 and at the other end to the connection point 6 of the transformer T1.

[0022] Optionally, a thermocoupled thermistor TVR1 is also included, which is connected in series with fuse F1 and has a neutral wire connected to the mains power.

[0023] Optionally, it also includes an interference suppression capacitor CY1, with its two ends connected to the positive and negative output terminals of the conversion control module, respectively.

[0024] Optionally, the relay zero-crossing detection module includes:

[0025] Optocoupler U2 has one of its two input terminals connected to the live wire of the mains power supply and the other connected to the neutral wire of the mains power supply. One of its two output terminals is connected to Vcc1 and the other is grounded.

[0026] Zener diode Z1 has its positive terminal connected to the live wire of the mains power supply and its negative terminal connected to the neutral wire of the mains power supply.

[0027] Transistor Q1 has its base connected to one end of optocoupler U2 connected to Vcc1, its collector connected to the connection point between Vcc1 and the controller input, and its emitter grounded.

[0028] The bias resistor R11 is connected in series with the base of transistor Q1, and the connection point between R11 and the base of transistor Q1 is used to connect the optocoupler U2 to one output terminal of Vcc1.

[0029] Safety resistor R12 is connected in series with the collector of transistor Q1;

[0030] The fourth diode, D4, is connected in series with one end of the optocoupler U2 connected to the mains power line.

[0031] The two input terminals of the optocoupler U2 are also connected in series with current limiting protection units.

[0032] Optionally, a third filter capacitor C6 is also included, one end of which is connected to the connection point between the collector of transistor Q1 and the input terminal of the controller, and the other end is grounded.

[0033] In summary, this application includes the following beneficial technical effects: converting the high current of the mains power into direct current, setting relays to control the high current devices of the bathroom heater, and controlling the on / off of each relay through a DC-powered controller, thereby isolating the user's operating switch from the high current of the mains power and improving the safety of using the bathroom heater. Attached Figure Description

[0034] Figure 1 This is a system block diagram of an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the circuit structure of the conversion control module in the embodiments of this application.

[0036] Figure 3This is a schematic diagram of the circuit structure of the relay zero-crossing detection module in the embodiments of this application.

[0037] Figure 4 This is a schematic diagram of the circuit structure of the peripheral relay module in the embodiments of this application. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0039] This application discloses a bathroom heater control device.

[0040] Reference Figure 1 The bathroom heater control device includes a conversion control module, an external relay module, a controller, and a relay zero-crossing detection module.

[0041] The conversion control module is connected to the mains power network and is used to convert mains power into DC power and output it. The peripheral relay module includes multiple relays for controlling high-current devices in the bathroom heater (such as heating lamps, lighting lamps, and ventilation fans integrated in the bathroom heater). The controller is an MCU, which is connected to the conversion control module and has several relay output terminals for connecting relays. The relay zero-crossing detection module is connected to the mains power network and is used to detect the zero-crossing point of AC power and output detection signals to the controller.

[0042] In this embodiment, the controller is electrically connected to several bathroom heater function switches that match each relay. It can be understood that the bathroom heater function switches are switches that can control the heating lamp, lighting lamp and ventilation fan in the bathroom heater respectively.

[0043] The above settings convert the high current of the mains power into direct current, and set up relays to control the high current devices of the bathroom heater. The DC-powered controller controls the on / off state of each relay, thereby isolating the user's operating switch from the high current of the mains power and improving safety. At the same time, the zero-crossing detection module of the relay can protect the relay from repeated opening and closing and damage, reduce contact damage, and extend service life.

[0044] Reference Figure 2 The conversion control module includes: fuse F1, rectifier bridge BD1, resonant unit, first filter capacitor C1, management chip SZ1, transformer T1, and peripheral circuit unit.

[0045] One end of fuse F1 is connected to the live wire of the mains power. In this embodiment, rectifier bridge BD1 is an ABS210 model. One of its two input terminals is connected to fuse F1, and the other end is connected to the neutral wire of the mains power. The two output terminals of rectifier bridge BD1 are positive and negative terminals, respectively. The resonant unit includes a polarized capacitor C2 and an inductor L1 connected in series. The negative terminal of polarized capacitor C2 is connected to the negative terminal of rectifier bridge BD1, and the positive terminal of polarized capacitor C2 is connected to inductor L1. The other end of inductor L1 is connected to the positive terminal of rectifier bridge BD1. The first filter capacitor C1 is a polarized capacitor and is connected in parallel with the resonant unit.

[0046] In this embodiment, the management chip SZ1 is model SZ2525, which has VCC, FB, CS, GND and VIN pins. The VCC pin is connected to the connection point between the resonant unit and the positive end of the rectifier bridge BD1, the GND pin is connected to the connection point between the resonant unit and the negative end of the rectifier bridge BD1, and there are two FB and two VIN pins.

[0047] In this embodiment, transformer T1 has two primary coils and one secondary coil. One primary coil has connection points 1 and 2 on its input side, and the other primary coil (auxiliary winding) has connection points 4 and 5 on its input side. The secondary coil has connection points 10 and 6 on its output side. Connection point 2 is connected to two interconnected VIN pins of the management chip SZ1, and connection point 6 serves as the positive output terminal.

[0048] The peripheral circuit unit includes a current-limiting resistor R01, which is connected in series with the VCC pin of the management chip SZ1.

[0049] It also includes a second filter capacitor C3, one end of which is connected to the connection point between the VCC pin of the management chip SZ1 and the current limiting resistor R01, and the other end is connected to the GND pin and the connection point between the resonant unit and the negative terminal of the rectifier bridge BD1.

[0050] It also includes a first diode D1, whose positive terminal is connected to two interconnected VIN pins of the management chip SZ1, and whose negative terminal is connected to the transformer terminal 1;

[0051] It also includes resistor R6, which is connected in series with the first diode D1;

[0052] It also includes parallel resistors RH and RL, with one end of each resistor connected to two interconnected FB pins of the management chip SZ1. The other end of resistor RH is connected to terminal 5 of transformer T1, and the other end of resistor RL is connected to terminal 4 of the transformer. Resistors RL and RH form a voltage divider network, which transmits the voltage of the auxiliary winding of transformer T1 to the management chip SZ1 proportionally, thereby enabling the management chip SZ1 to indirectly monitor and stabilize the output voltage of the primary and secondary windings.

[0053] It also includes a second diode D2, whose positive terminal is connected to the connection point 5 of transformer T1, and whose negative terminal is connected to the connection point between current limiting resistor R01 and the VCC pin of management chip SZ1.

[0054] It also includes a third diode D3 to prevent reverse flow, whose negative terminal is connected to the terminal 10 of transformer T1, and whose positive terminal serves as the negative output terminal and is connected to the GND pin of management chip SZ1.

[0055] It also includes a resistor S1, one end of which is connected to the CS pin of the management chip SZ1, and the other end is connected to the second filter capacitor C3, which is used to suppress instantaneous current and protect the internal circuit of the chip.

[0056] In another embodiment of this application, the conversion control module further includes two sets of RC units. One RC unit is connected in series with the negative terminal of the first diode D1, and one end of the other RC unit is connected to the positive terminal of the third diode D3 and the other end is connected to the connection point 6 of the transformer T1. Specifically, the RC units are resistors and capacitors connected in parallel. Through the above arrangement, a filtering function is achieved.

[0057] In another embodiment of this application, the conversion control module further includes a thermostatic thermistor TVR1, which is connected in series with the fuse F1 and has a neutral wire connected to the mains power. The main function of the thermostatic thermistor TVR1 is to protect the circuit from damage when the power input is 100-380VAC and the instantaneous maximum withstand voltage is 400VAC. The rated voltage for normal use is 100-240VAC.

[0058] The conversion control module also includes an interference suppression capacitor CY1, with its two ends connected to the positive and negative output terminals of the conversion control module, respectively.

[0059] Reference Figure 3 In another embodiment of this application, the relay zero-crossing detection module includes:

[0060] In this embodiment, the optocoupler U2 is a PC817C-S model. One of its two input terminals is connected to the live wire of the mains power supply, and the other is connected to the neutral wire of the mains power supply. One of its two output terminals is connected to Vcc1 (e.g., 5V), and the other is grounded.

[0061] Zener diode Z1 has its positive terminal connected to the live wire of the mains power supply and its negative terminal connected to the neutral wire of the mains power supply.

[0062] In this embodiment, transistor Q1 is selected as SS8050. Its base is connected to one end of optocoupler U2 connected to Vcc1, its collector is connected to the connection point between Vcc1 and the controller input terminal, and its emitter is grounded.

[0063] The bias resistor R11 is connected in series with the base of transistor Q1, and the connection point between R11 and the base of transistor Q1 is used to connect the optocoupler U2 to one output terminal of Vcc1.

[0064] The safety resistor R12 is connected in series with the collector of transistor Q1 to limit current.

[0065] The fourth diode, D4, is connected in series with one end of the optocoupler U2 connected to the mains power line.

[0066] The third filter capacitor C6 has one end connected to the connection point between the collector of transistor Q1 and the input terminal of the controller, and the other end grounded.

[0067] In this embodiment, the two input terminals of the optocoupler U2 are also connected in series with current limiting protection units. The current limiting protection units are two resistors connected in series.

[0068] With the above settings, the zero-crossing point of the AC sine wave can be detected and the detection signal is sent to the controller. When the user presses the function switch (when the controller needs to open or close the relay), it will wait for the moment the zero-crossing signal is received before it will act. This can eliminate the surge current and arcing phenomenon generated when the relay switch contacts close or open, reduce contact damage, and thus extend service life.

[0069] Reference Figure 4 Regarding the multiple relays in the peripheral relay module, the specific setup is as follows: Relay coil connection point 1 is connected to the controller, coil connection point 2 is connected to Vcc2 (e.g., 12V), and the controller controls the coil to be energized or de-energized; relay normally open switch connection point 3 is connected to the live wire of the mains power, and relay normally open switch connection point 4 is connected to the power supply circuit of the bathroom heater.

[0070] It is understood that each relay independently controls a function switch, and the corresponding number of relays can be set according to the different functions of the bathroom heater. Since the connection method of each relay is the same, in this embodiment, one relay is used as an example for description, and other relays that control different functions of the bathroom heater will not be described repeatedly.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bathroom heater control device, characterized in that, include: The conversion control module, which is connected to the mains power network, is used to convert mains power into DC power and output it. The peripheral relay module includes several relays for controlling the high-current devices in the bathroom heater; The controller is connected to the conversion control module and has several relay output terminals for connecting relays; The relay zero-crossing detection module is connected to the mains power network and is used to detect the zero-crossing point of the AC power and output a detection signal to the controller. The controller is electrically connected to several bathroom heater function switches that match each relay.

2. The bathroom heater control device according to claim 1, characterized in that: The conversion control module includes: Fuse F1, one end of which is connected to the live wire of the mains power; The rectifier bridge BD1 has one of its two input terminals connected to fuse F1, and the other terminal connected to the neutral wire of the mains power supply. The resonant unit has its two ends connected to the two output terminals of the rectifier bridge BD1, which are positive and negative terminals respectively. The first filter capacitor C1 is connected in parallel to the resonant unit; The management chip SZ1 has VCC, FB, CS, GND, and VIN pins. The VCC pin is connected to the connection point between the resonant unit and the positive terminal of the rectifier bridge BD1, the GND pin is connected to the connection point between the resonant unit and the negative terminal of the rectifier bridge BD1, and there are two FB and two VIN pins. Transformer T1 has connection points 1, 2, 4 and 5 on its input side and connection points 10 and 6 on its output side. Connection point 2 is connected to two interconnected VIN pins of the management chip SZ1, and connection point 6 serves as the positive output terminal. The peripheral circuit unit includes a current-limiting resistor R01 connected in series with the VCC pin of the management chip SZ1; a second filter capacitor C3, one end of which is connected to the connection point between the VCC pin of the management chip SZ1 and the current-limiting resistor R01, and the other end is connected to the GND pin and the connection point between the resonant unit and the negative terminal of the rectifier bridge BD1; a first diode D1, the positive terminal of which is connected to the two interconnected VIN pins of the management chip SZ1, and the negative terminal of which is connected to the transformer terminal 1; a resistor R6 connected in series with the first diode D1; and resistors RH and RL connected in parallel, with one end of both connected to the management chip. The chip SZ1 has two interconnected FB pins. The other end of the resistor RH is connected to the terminal 5 of the transformer T1, and the other end of the resistor RL is connected to the terminal 4 of the transformer. It also includes a second diode D2, whose positive end is connected to the terminal 5 of the transformer T1, and whose negative end is connected to the connection point between the current limiting resistor R01 and the VCC pin of the management chip SZ1. It also includes a third diode D3, whose negative end is connected to the terminal 10 of the transformer T1, and whose positive end serves as the negative output terminal and is connected to the GND pin of the management chip SZ1. It also includes a resistor S1, one end of which is connected to the CS pin of the management chip SZ1, and the other end is connected to the second filter capacitor C3.

3. The bathroom heater control device according to claim 2, characterized in that: The resonant unit includes a polarized capacitor C2 and an inductor L1 connected in series. The negative terminal of the polarized capacitor C2 is connected to the negative terminal of the rectifier bridge BD1.

4. The bathroom heater control device according to claim 2, characterized in that: It also includes two sets of RC units. One RC unit is connected in series with the negative terminal of the first diode D1, and one end of the other RC unit is connected to the positive terminal of the third diode D3 and the other end is connected to the connection point 6 of the transformer T1.

5. The bathroom heater control device according to claim 2, characterized in that: It also includes a thermocoupled thermistor TVR1, which is connected in series with fuse F1 and has a neutral wire connected to the mains power.

6. The bathroom heater control device according to claim 2, characterized in that: It also includes an interference suppression capacitor CY1, with its two ends connected to the positive and negative output terminals of the conversion control module, respectively.

7. The bathroom heater control device according to claim 1, characterized in that: The relay zero-crossing detection module includes: Optocoupler U2 has one of its two input terminals connected to the live wire of the mains power supply and the other connected to the neutral wire of the mains power supply. One of its two output terminals is connected to Vcc1 and the other is grounded. Zener diode Z1 has its positive terminal connected to the live wire of the mains power supply and its negative terminal connected to the neutral wire of the mains power supply. Transistor Q1 has its base connected to one end of optocoupler U2 connected to Vcc1, its collector connected to the connection point between Vcc1 and the controller input, and its emitter grounded. The bias resistor R11 is connected in series with the base of transistor Q1, and the connection point between R11 and the base of transistor Q1 is used to connect the optocoupler U2 to one output terminal of Vcc1. Safety resistor R12 is connected in series with the collector of transistor Q1; The fourth diode, D4, is connected in series with one end of the optocoupler U2 connected to the mains power line. The two input terminals of the optocoupler U2 are also connected in series with current limiting protection units.

8. The bathroom heater control device according to claim 7, characterized in that: It also includes a third filter capacitor C6, one end of which is connected to the connection point between the collector of transistor Q1 and the input terminal of the controller, and the other end is grounded.

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