Heating control structure in dual-power mode

Abstract

The utility model discloses a heating control structure in a dual-power mode, which relates to the technical field of photovoltaic water heaters and comprises a metal oxide semiconductor (MOS) module. The MCU controls the driving module; the temperature protection module is provided with a temperature fuse, and when the MCU control driving module controls driving and detects that the temperature of a certain module is too high during abnormal work, the temperature fuse is disconnected to cut off photovoltaic power; and the voltage stabilizing module is used for voltage protection when the MCU controls the driving module or the MOS module to be started. According to the utility model, after the commercial power is cut off, the MOS is driven in a manner of cascade driving of the two triodes, so that the grid electrode of the MOS is kept at a low level after power failure, and the level of the control electrode of the MOS is prevented from rising, thereby avoiding damage to the MOS tube, improving the use effectiveness of a commercial power system, and reducing the use cost of the MOS tube; and voltage stabilization protection and temperature safety protection are provided for the driving MOS module through the voltage stabilization module and the temperature protection module, so that the safety of the system is greatly enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic water heaters, and particularly relates to a heating control structure under a dual-power supply mode. Background Technique

[0002] In the prior art, a photovoltaic water heater can only work normally under the condition of commercial power. Based on the voltage generated by commercial power, the corresponding MOS tube is driven. Usually, a single triode is used to drive the MOS. After the system loses power, due to the discharge of the capacitor in the circuit board, there will be a slow power-down process. When the power supply module stops supplying power, the single-chip microcomputer will stop working. At this time, when the single triode drives, the VGS voltage of the MOS will rise back to synchronize with the power supply voltage, which will damage the MOS tube and further affect the normal operation of the system. Therefore, to solve the above problems, a heating control structure under a dual-power supply mode is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a heating control structure under a dual-power supply mode to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A heating control structure under a dual-power supply mode, including:

[0005] A MOS module, which is used for the DC heating tube to work when the MOS tube is turned on, and the DC heating tube to stop working when the MOS tube is turned off;

[0006] An MCU control and drive module, which is used for receiving the control of the MCU and selecting whether to drive the MOS module when forming a loop with the MOS module;

[0007] A temperature protection module, which is provided with a temperature fuse. When being controlled and driven by the MCU control and drive module, when detecting that a certain module works abnormally and the temperature rises too high, the temperature fuse is disconnected to cut off the photovoltaic power;

[0008] A voltage stabilization module, which is used for protecting the voltage when the MCU control and drive module or the MOS module is turned on, and quickly turning off the MOS module when the MOS module is turned off.

[0009] Preferably, the MCU control and drive module includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, triode Q1 and triode Q2. One end of resistor R1 is connected to the GPIO pin of the MCU, and the other end of resistor R1 is connected to one end of resistor R6 and the base of triode Q1. The other end of resistor R6 is grounded. The emitter of triode Q1 is grounded. The collector of triode Q1 is connected to one end of resistor R3 and one end of resistor R2. The other end of resistor R3 is connected to the supply voltage. The other end of resistor R2 is connected to the base of triode Q2. The collector of triode Q2 is connected to one end of resistor R4 and one end of resistor R5. The other end of resistor R4 is connected to the supply voltage. The emitter of triode Q2 is grounded.

[0010] Preferably, the voltage stabilization module includes voltage stabilizing diode D1 and TVS diode D2. The negative pole of voltage stabilizing diode D1 is connected to the other end of resistor R5 and the MOS module. The positive pole of voltage stabilizing diode D1 is connected to the negative pole of the power supply. The negative pole of TVS diode D2 is connected to the MOS module.

[0011] Preferably, the temperature protection module includes temperature control fuse F1. One end of temperature control fuse F1 is connected to TVS diode D2, and the other end of temperature control fuse F1 is grounded.

[0012] Preferably, the MOS module includes a MOS transistor and a DC heating tube. The MOS transistor is connected to the negative pole of TVS diode D2 and the negative pole of voltage stabilizing diode D1. The two ends of the DC heating tube are respectively connected to TVS diode D2 and the positive pole of the power supply.

[0013] The technical effects and advantages of the present utility model:

[0014] After the mains power is disconnected, the present utility model drives the MOS through a cascaded drive mode of two triodes, so that the MOS gate remains at a low level after power-off, thereby preventing the control electrode level of the MOS from rising. This can avoid damaging the MOS transistor, improve the effectiveness of the mains power system, reduce the usage cost of the MOS transistor, and provide voltage stabilization protection and temperature safety protection for the drive MOS module through the voltage stabilization module and the temperature protection module, greatly enhancing the safety of the system. Description of the Drawings

[0015] Figure 1 It is a circuit diagram of a heating control structure in a dual power supply mode.

[0016] Figure 2 It is a circuit diagram of an intelligent photovoltaic heater. Detailed Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] The present utility model provides a heating control structure in a dual - power supply mode as shown in Figure 1-2 and includes:

[0019] A MOS module. When the MOS transistor in the MOS module conducts, the DC heating tube works; when the MOS transistor is cut off, the DC heating tube stops working.

[0020] An MCU control and drive module. When forming a loop with the MOS module, it receives the control of the MCU and selects whether to drive the MOS module.

[0021] A temperature protection module. The temperature protection module is provided with a temperature fuse. When controlled and driven by the MCU control and drive module, when it detects that a certain module has abnormal operation and the temperature rises too high, the temperature fuse disconnects to cut off the photovoltaic power.

[0022] A voltage stabilization module. The voltage stabilization module is used for protecting the voltage when the MCU control and drive module or the MOS module is turned on, and quickly turning off the MOS module when the MOS module is cut off.

[0023] Specifically referring to Figure 2 , in this embodiment, a heating control structure in a dual - power supply mode is a part of the circuit of an intelligent photovoltaic heater. When controlled and driven by the MCU control and drive module, a temperature protection module is set to detect the water temperature information of the water heater and feedback it to the MCU. Then, the MCU selects whether to drive the MOS module according to the water temperature information. The voltage generated by the photovoltaic panel is processed by a corresponding DC - DC module for buck - down, and finally converted into the photovoltaic panel voltage VCC to supply working power. There are also set a photovoltaic voltage detection module, a mains detection module and a water temperature sensor circuit module to detect the corresponding voltages and water temperature. The above content is prior art and will not be elaborated here.

[0024] In this embodiment, specifically referring to Figure 1, the MCU control and drive module includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, transistor Q1 and transistor Q2. One end of resistor R1 is connected to the GPIO pin of the MCU, and the other end of resistor R1 is connected to one end of resistor R6 and the base of transistor Q1. The other end of resistor R6 is grounded, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to one end of resistor R3 and one end of resistor R2. The other end of resistor R3 is connected to the supply voltage, the other end of resistor R2 is connected to the base of transistor Q2, the collector of transistor Q2 is connected to one end of resistor R4 and one end of resistor R5. The other end of resistor R4 is connected to the supply voltage, and the emitter of transistor Q2 is grounded.

[0025] When the MCU control and drive module drives the MOS module, it determines whether to turn on the MOS based on the photovoltaic voltage and the water temperature. The MCU control and drive module drives the MOS in a cascaded manner with two transistors. After the mains input is cut off, the power supply voltage drops slowly and the single-chip microcomputer does not work. At this time, the cascaded drive of the two transistors will always pull down the control pole of the MOS. The voltage stabilizing diode D1 and the TVS diode D2 will clamp the voltage within a safe range. The thermal fuse acts as an insurance for the abnormal increase in the temperature of the working module. In case of abnormal temperature, the thermal fuse will be prompted to disconnect, thus cutting off the photovoltaic voltage.

[0026] In this embodiment, specifically refer to Figure 1 , the voltage stabilizing module includes voltage stabilizing diode D1 and TVS diode D2. The negative pole of voltage stabilizing diode D1 is connected to the other end of resistor R5 and the MOS module, and the positive pole of voltage stabilizing diode D1 is connected to the negative pole of the power supply. The negative pole of TVS diode D2 is connected to the MOS module.

[0027] When the MCU control and drive module drives the MOS module, during the process that the voltage enters the MOS module through resistor R5, it enters the MOS module after passing through voltage stabilizing diode D1. Voltage stabilizing diode D1 clamps the gate voltage of the MOS module below the safe level, and when the MOS module is running, TVS diode D2 clamps the power supply across the MOS module within a safe range.

[0028] In this embodiment, specifically refer to Figure 1 , the temperature protection module includes thermal fuse F1. One end of thermal fuse F1 is connected to TVS diode D2, and the other end of thermal fuse F1 is grounded.

[0029] A thermal fuse is provided in the temperature protection module. When the MCU control and drive module drives the MOS module, the thermal fuse and thermal fuse F1 in the temperature protection module can detect the module components. When it is detected that a certain module component has abnormal operation and overheating, the thermal fuse can immediately disconnect to cut off the photovoltaic power, thereby avoiding damage to the module components caused by overheating and effectively improving the safety during the operation of the MOS module.

[0030] In this embodiment, specifically referring to Figure 1 , the MOS module includes a MOS transistor and a DC heating tube. The MOS transistor is connected to the cathode of the TVS diode D2 and the zener diode D1. Both ends of the DC heating tube are respectively connected to the TVS diode D2 and the positive power supply.

[0031] When the MOS transistor is turned on, the photovoltaic voltage is grounded through the DC heating tube, the MOS transistor, the temperature control fuse F1, and the TVS diode D2 to form a loop, and the DC heating tube works to heat.

[0032] Above, the working principle of the heating control component composed of multiple modules is as follows: When the MCU controls the driving module and the MOS module to form a loop, it can receive the control of the MCU, so as to select whether to drive the MOS module; when the temperature protection module is used to form a loop with the MOS module, it can detect the usage of multiple modules through the provided fuse, so that when it is found that a certain module is working abnormally and the temperature rises too high, it can cut off the photovoltaic power in time, thereby protecting the safety of multiple modules. The voltage stabilizing module is used to prevent the voltage of the MCU control driving module from being abnormal, so that in the case of power failure, the double triode cascade drive can be used to ensure that after the power is cut off, the single-chip microcomputer can quickly control the MOS to be completely turned off, effectively avoiding the problem of the gate voltage rising when the MOS is turned off during the power-off process.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heating control structure under a dual-power supply mode, characterized in that, Including: A MOS module, which is used to make the DC heating tube work when the MOS transistor is turned on and stop working when the MOS transistor is turned off; An MCU control and drive module, which is used to receive the control of the MCU and select whether to drive the MOS module when forming a loop with the MOS module; A temperature protection module, which is provided with a thermal fuse. When controlling and driving based on the MCU control and drive module and detecting that a certain module has abnormal operation and overheats, the thermal fuse disconnects to cut off the photovoltaic power; A voltage stabilizing module, which is used for voltage protection when the MCU control and drive module or the MOS module is turned on, and quickly turns off the MOS module when the MOS module is turned off.

2. A heating control structure in a dual power supply mode according to claim 1, characterized in that, The MCU control and drive module includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, transistor Q1 and transistor Q2. One end of resistor R1 is connected to the GPIO pin of the MCU, and the other end of resistor R1 is connected to one end of resistor R6 and the base of transistor Q1. The other end of resistor R6 is grounded. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to one end of resistor R3 and one end of resistor R2. The other end of resistor R3 is connected to the supply voltage. The other end of resistor R2 is connected to the base of transistor Q2. The collector of transistor Q2 is connected to one end of resistor R4 and one end of resistor R5. The other end of resistor R4 is connected to the supply voltage. The emitter of transistor Q2 is grounded.

3. A heating control structure in a dual power supply mode according to claim 2, characterized in that, The voltage stabilizing module includes a zener diode D1 and a TVS diode D2. The negative pole of the zener diode D1 is connected to the other end of resistor R5 and the MOS module. The positive pole of the zener diode D1 is connected to the negative pole of the power supply. The negative pole of the TVS diode D2 is connected to the MOS module.

4. A heating control structure in a dual-power supply mode according to claim 3, characterized in that, The temperature protection module includes a thermal control fuse F1. One end of the thermal control fuse F1 is connected to the TVS diode D2, and the other end of the thermal control fuse F1 is grounded.

5. A heating control structure in a dual power supply mode according to claim 4, characterized in that, The MOS module includes a MOS transistor and a DC heating tube. The MOS transistor is connected to the TVS diode D2 and the negative pole of the zener diode D1. The two ends of the DC heating tube are respectively connected to the TVS diode D2 and the positive pole of the power supply.

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