Air conditioner sterilization power supply circuit and device

Abstract

The utility model discloses an air conditioner sterilization power supply circuit and device, the air conditioner sterilization power supply circuit comprises an AC-DC conversion circuit, a master control circuit and a channel control circuit, the AC-DC conversion circuit is used for supplying power to an air conditioner through commercial power AC and converting the commercial power AC into low-voltage DC; the low-voltage direct current output by the AC-DC conversion circuit supplies power to the main control circuit; the channel control circuit is connected with the main control circuit and comprises a first switch channel and a second switch channel, the first switch channel is used for being connected with a first sterilization device, and the second switch channel is used for being connected with a second sterilization device; the main control circuit is used for performing sterilization switch control on the first sterilization device through the first switch channel, and is also used for performing sterilization switch control on the second sterilization device through the second switch channel; therefore, the socket / plug comprising the power supply circuit can supply power to the air conditioner and the two sterilization devices at the same time, and is more convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to an air conditioner sterilization power supply circuit and device. Background Technology

[0002] As is the current situation, whether it is old-fashioned air conditioners used in homes, offices, hotels, shopping malls, hospitals, supermarkets and restaurants, they basically do not have ultraviolet sterilization function. As a result, the air blown out by the air conditioner does not have a purification effect, so outdoor germs can easily enter the room through the air conditioner and cause germ infection.

[0003] Currently, indoor air conditioners typically only have a single-socket socket next to them to connect the air conditioner plug and power it. When it is necessary to use an ultraviolet germicidal lamp to sterilize the air conditioner, an additional power strip needs to be connected to the corresponding single-socket socket to provide multiple sockets to power both the air conditioner and the additional ultraviolet germicidal lamp. This method is relatively cumbersome.

[0004] In response, the inventor of this patent, drawing on experience, deeply considered the problems encountered in his work, reviewed a large amount of scientific research data and literature, and gradually conceived and designed this application through a novelty search to solve the relevant technical problems. Utility Model Content

[0005] The present invention aims to at least partially solve one of the technical problems in the related art. Therefore, one objective of the present invention is to provide an air conditioner sterilization power supply circuit and device.

[0006] On the one hand, to achieve the above objectives, according to the air conditioner sterilization power supply circuit and device of the present utility model embodiment, the air conditioner sterilization power supply circuit includes:

[0007] An AC / DC conversion circuit is used to power an air conditioner with AC mains power and to convert AC mains power into low-voltage DC power.

[0008] The main control circuit is provided with the low-voltage DC output terminal of the AC-DC conversion circuit connected to the main control circuit to supply power to the main control circuit.

[0009] A channel control circuit is provided, which is connected to the main control circuit. The channel control circuit includes a first switch channel and a second switch channel. The first switch channel is used to connect to a first sterilization device, and the second switch channel is used to connect to a second sterilization device. The main control circuit is used to control the sterilization switch of the first sterilization device through the first switch channel, and the main control circuit is also used to control the sterilization switch of the second sterilization device through the second switch channel.

[0010] Furthermore, according to one embodiment of the present invention, the air conditioner sterilization power supply circuit and device further include:

[0011] A current detection circuit is connected to the main control circuit. The main control circuit is used to detect the power supply current of the air conditioner through the current detection circuit, and when the power supply circuit detects that the air conditioner is in working condition, it controls the first sterilization device and / or the second sterilization device to start sterilization through the channel control circuit.

[0012] Furthermore, according to one embodiment of the present invention, the current detection circuit includes:

[0013] A current transformer circuit includes a transformer T3 and a first rectifier bridge BD2. The primary coil of the transformer T3 is connected in series in the power supply circuit of the air conditioner, and the secondary coil of the transformer T3 is connected to the first rectifier bridge BD2. The first rectifier bridge BD2 is used to rectify and output the induced signal output from the secondary coil of the transformer T3.

[0014] The signal acquisition circuit includes a first resistor R6 and a second resistor R26. One end of the first resistor R6 is connected to the positive output terminal of the first rectifier bridge BD2, and the other end of the first resistor R6 is connected to one end of the second resistor R26. The other end of the second resistor R26 is connected to a reference ground. The main control circuit includes a controller, and the current detection terminal of the controller is connected to the common terminal of the first resistor R6 and the second resistor R26 through a third resistor R5.

[0015] Furthermore, according to one embodiment of the present invention, the current transformer circuit further includes:

[0016] The first capacitor C6 has one end connected to the positive output terminal of the first rectifier bridge BD2 and the other end connected to the reference ground. The first capacitor C6 is used to regulate the output voltage of the signal from the first rectifier bridge BD2.

[0017] A fourth resistor R7 is connected at one end to one end of the first capacitor C6, and at the other end of the fourth resistor R7 is connected to the other end of the first capacitor C6.

[0018] Furthermore, according to one embodiment of the present invention, the signal acquisition circuit further includes:

[0019] An overvoltage protection diode ZD2, the cathode of which is connected to the other end of the first resistor R6, and the other end of which is connected to a reference ground;

[0020] The second capacitor C4 has one end connected to the current detection terminal of the controller and the other end connected to the reference ground.

[0021] Furthermore, according to one embodiment of the present invention, the main control circuit further includes a linear buck circuit, which is used to step down the low-voltage DC power output by the AC-DC conversion circuit to power the controller.

[0022] Furthermore, according to one embodiment of the present invention, the linear buck circuit includes:

[0023] Transistor Q1, the collector of transistor Q1 is connected to the low-voltage DC output terminal of the AC-DC conversion circuit, the collector of transistor Q1 is also connected to the base of transistor Q1 through the fifth resistor R2, the emitter of transistor Q1 is connected to one end of capacitor C2, the other end of capacitor C2 is connected to reference ground, and the emitter of transistor Q1 is also connected to the power supply terminal of the controller;

[0024] Zener diode ZD1, the cathode of which is connected to the base of transistor Q1, and the anode of which is connected to reference ground.

[0025] Furthermore, according to one embodiment of the present invention, the air conditioner sterilization power supply circuit and device further include:

[0026] An indicator light circuit, including an LED, is connected to the main control circuit to indicate the working status of the first sterilization device and / or the second sterilization device under the control of the main control circuit.

[0027] Furthermore, according to one embodiment of the present invention, the AC / DC conversion circuit includes:

[0028] An AC input circuit is provided, comprising a varistor VR1, a common-mode inductor LF1, and a safety capacitor CX1. The varistor VR1 is connected in parallel to the AC mains input terminal, the common-mode inductor LF1 is connected in series in the AC mains power supply circuit, and the safety capacitor CX1 is connected in parallel in the AC mains power supply circuit.

[0029] A bridge rectifier filter circuit includes a second rectifier bridge BD1, a third capacitor C5, a fourth capacitor C3, a first inductor L1, and a second inductor L2. The input terminal of the second rectifier bridge BD1 is connected to the output terminal of the AC input circuit. The two ends of the third capacitor C5 are respectively connected to the two output terminals of the second rectifier bridge BD1. One end of the first inductor L1 is connected to the positive output terminal of the second rectifier bridge BD1, and the other end of the first inductor L1 is connected to one end of the fourth capacitor C3. One end of the second inductor L2 is connected to the negative output terminal of the second rectifier bridge BD1, and the other end of the fourth capacitor C3 is connected to the other end of the second inductor L2.

[0030] A step-down circuit is provided, which is connected to the bridge rectifier filter circuit to convert the high-voltage DC output from the bridge rectifier filter circuit into low-voltage DC.

[0031] Furthermore, according to one embodiment of the present invention, the step-down circuit includes:

[0032] A transformer circuit includes a transformer T1A and an output filter circuit. The primary coil of the transformer T1A is connected to the output terminal of the bridge rectifier filter circuit, and the secondary coil of the transformer T1A is connected to the output filter circuit. The output filter circuit includes a diode D1 and a second capacitor C4. The anode of the diode D1 is connected to one end of the secondary coil of the transformer T1A, the cathode of the diode D1 is connected to one end of the second capacitor C4, and the other end of the second capacitor C4 is connected to the other end of the secondary coil of the transformer T1A.

[0033] A pulse signal modulation circuit, the pulse signal modulation circuit including a power controller, the modulation control terminal SW of the power controller being connected to the secondary coil of the transformer T1A, so as to perform transformer modulation control on the transformer T1A;

[0034] An auxiliary coil circuit is provided to supply operating power to the power controller.

[0035] On the other hand, this utility model embodiment also provides an air conditioner sterilization power supply device, characterized in that it includes:

[0036] case;

[0037] The air conditioner sterilization power supply circuit described above is installed inside the housing.

[0038] The air conditioner sterilization power supply circuit and device provided in this embodiment of the utility model uses an AC / DC conversion circuit to power the air conditioner with AC mains power and to convert AC mains power into low-voltage DC power. The low-voltage DC output terminal of the AC / DC conversion circuit is connected to the main control circuit to power the main control circuit. A channel control circuit is connected to the main control circuit. The channel control circuit includes a first switch channel and a second switch channel. The first switch channel is used to connect to a first sterilization device, and the second switch channel is used to connect to a second sterilization device. The main control circuit is used to control the sterilization switch of the first sterilization device through the first switch channel, and the main control circuit is also used to control the sterilization switch of the second sterilization device through the second switch channel. In this way, the socket / plug containing this power supply circuit can simultaneously power the air conditioner and two sterilization devices, making it more convenient to use. Attached Figure Description

[0039] Figure 1 A schematic diagram of the power supply circuit structure for air conditioner sterilization provided in this embodiment of the utility model;

[0040] Figure 2 This is a schematic diagram of the AC / DC conversion circuit structure provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the main control circuit structure provided in an embodiment of the present utility model;

[0042] Figure 4 A schematic diagram of the dual-channel control circuit structure provided in this embodiment of the utility model;

[0043] Figure 5 A schematic diagram of the indicator light circuit structure provided in this embodiment of the utility model;

[0044] Figure 6 A schematic diagram of the connection structure between the air conditioner sterilization power supply circuit and the two sterilization devices provided in this embodiment of the utility model.

[0045] Figure label:

[0046] Power supply device 10 for air conditioning and sterilization equipment;

[0047] First sterilization device 20;

[0048] Second sterilization device 30.

[0049] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] See Figures 1 to 4 An air conditioner sterilization power supply circuit includes: an AC / DC conversion circuit, a main control circuit, and a channel control circuit. The AC / DC conversion circuit is used to supply power to the air conditioner via AC mains power and to convert the AC mains power into low-voltage DC power. Figure 1 and 2 As shown, the AC / DC conversion circuit can convert AC mains power into low-voltage DC power, which can then power downstream circuits. The low-voltage DC power can be common voltages such as 12V or 5V.

[0053] The low-voltage DC output terminal of the AC / DC conversion circuit is connected to the main control circuit to supply power to the main control circuit; by outputting a DC supply voltage of about 5V, the main control circuit can be powered.

[0054] The channel control circuit is connected to the main control circuit. The channel control circuit includes a first switch channel and a second switch channel. The first switch channel is used to connect to a first sterilization device, and the second switch channel is used to connect to a second sterilization device. The main control circuit is used to control the sterilization switch of the first sterilization device through the first switch channel, and the main control circuit is also used to control the sterilization switch of the second sterilization device through the second switch channel.

[0055] like Figure 2 and Figure 4As shown, the channel control circuit may include a dual-channel channel controller U1. The first channel control terminal of the channel controller U1 is connected to the main control circuit via the EN1 signal terminal, and the second channel control terminal of the channel controller U1 is connected to the main control circuit via the EN2 signal terminal. The first switching channel is connected to the first sterilization device via the V1- signal terminal; the second switching channel is connected to the second sterilization device via the V2- signal terminal. When the main control circuit is turned on via EN1, the V1- signal terminal is connected to the reference ground SGND, thereby connecting the power supply circuit of the first sterilization device and illuminating the ultraviolet lamp of the sterilization device for sterilization. Similarly, when the main control circuit is turned on via EN2, the V2- signal terminal is connected to the reference ground SGND, thereby connecting the power supply circuit of the second sterilization device and illuminating the ultraviolet lamp of the sterilization device for sterilization. This allows the main control circuit to control the switching of the two sterilization devices. Figure 1 As shown, the first DC power and control signals V1- and V2- can be output externally via low-voltage interfaces JP1 or J1. For example, they can be connected to the sterilization device via USB to power and control the sterilization device.

[0056] See Figures 1 to 3 The air conditioner sterilization power supply circuit and device further include: a current detection circuit, which is connected to the main control circuit. The main control circuit is used to detect the power supply current of the air conditioner through the current detection circuit, and when the power supply circuit detects that the air conditioner is in working condition, it controls the first sterilization device and / or the second sterilization device to start sterilization through the channel control circuit.

[0057] Specifically, typically, the sterilization control of the two sterilization devices only needs to be activated when the air conditioner is turned on. One of these sterilization devices is usually located at the air outlet of the air conditioner. Airflow only begins at the air outlet after the control is activated. Therefore, the sterilization control of the two sterilization devices only needs to be activated after the air conditioner starts operating. To determine whether the air conditioner is operating, the current in the air conditioner's power supply circuit can be detected. When the air conditioner is operating, the current in the power supply circuit is usually relatively high; otherwise, the current is relatively low. The current detection circuit can detect the magnitude of the current in the power supply circuit and transmit the detection result to the main control circuit. The main control circuit can determine whether the air conditioner is operating based on the current magnitude. If it is operating, a control signal can be output through the EN1 or EN2 signal terminals to activate one or both sterilization devices. This avoids the two sterilization devices being continuously activated, saving energy and ensuring the long-term use of the sterilization devices.

[0058] See Figure 2 and Figure 3 The current detection circuit includes a current transformer circuit and a signal acquisition circuit. The current transformer circuit includes a transformer T3 and a first rectifier bridge BD2. The primary coil of the transformer T3 is connected in series in the power supply circuit of the air conditioner. The secondary coil of the transformer T3 is connected to the first rectifier bridge BD2. The first rectifier bridge BD2 is used to rectify and output the induced signal output by the secondary coil of the transformer T3.

[0059] Specifically, such as Figure 2 As shown, the primary coil of transformer T3 is connected in series in the power supply circuit of the air conditioner. This allows the actual operating current of the air conditioner to be obtained, and the current is output to the first rectifier bridge BD2 via mutual inductance. The first rectifier bridge BD2 converts the mutually inducted AC current into DC current and outputs it to the signal acquisition circuit for current signal acquisition. The current inductance circuit may also include a first capacitor C6 and a fourth resistor R7. One end of the first capacitor C6 is connected to the positive output terminal of the first rectifier bridge BD2, and the other end is connected to ground. The first capacitor C6 is used to regulate the voltage output of the signal from the first rectifier bridge BD2. The fourth capacitor C3 converts the half-wave DC current output from the full-wave rectifier bridge BD2 into a stable DC current. One end of the fourth resistor R7 is connected to one end of the first capacitor C6, and the other end of the fourth resistor R7 is connected to the other end of the first capacitor C6. The fourth resistor R7 dissipates the charge of the first capacitor C6. When the air conditioner is not working, and there is no current in the air conditioner power supply circuit, the first rectifier bridge BD2 has no voltage output. When the return current from the air conditioner's power supply is very small, the charge on the first capacitor C6 is quickly dissipated by the fourth resistor R7, resulting in a very small voltage output to the signal acquisition circuit. When the air conditioner is working normally, the return current from its power supply is larger, allowing the first capacitor C6 to provide a larger supply voltage to the signal acquisition circuit. When the main control circuit detects this larger voltage, it can determine that the air conditioner is in operation.

[0060] like Figure 2 and Figure 3As shown, the signal acquisition circuit includes a first resistor R6 and a second resistor R26. One end of the first resistor R6 is connected to the positive output terminal of the first rectifier bridge BD2, and the other end of the first resistor R6 is connected to one end of the second resistor R26. The other end of the second resistor R26 is connected to a reference ground. The main control circuit includes a controller, and the current detection terminal of the controller is connected to the common terminal of the first resistor R6 and the second resistor R26 through a third resistor R5. The first resistor R6 and the second resistor R26 form a voltage divider circuit, which can divide the voltage output by the current transformer circuit and output it to the main control circuit for detection. In one embodiment of this utility model, the signal acquisition circuit further includes an overvoltage protection diode ZD2 and a second capacitor C4. The cathode of the overvoltage protection diode ZD2 is connected to the other end of the first resistor R6, and the other end of the overvoltage protection diode ZD2 is connected to a reference ground. One end of the second capacitor C4 is connected to the current detection terminal of the controller, and the other end of the second capacitor C4 is connected to a reference ground. The overvoltage protection diode ZD2 limits the detection voltage VAC_EN output to the controller U2, thereby preventing high-voltage pulses from being output to the controller U2 and protecting it. The second capacitor C4 also absorbs the pulse signal, ensuring the reliability of the signal output to the controller U2.

[0061] See Figure 3 The main control circuit also includes a linear buck circuit, which steps down the low-voltage DC output from the AC / DC conversion circuit to power the controller. Figure 3 As shown, the linear buck converter circuit includes: a transistor Q1 and a Zener diode ZD1. The collector of transistor Q1 is connected to the low-voltage DC output terminal of the AC / DC converter circuit. The collector of transistor Q1 is also connected to the base of transistor Q1 through a fifth resistor R2. The emitter of transistor Q1 is connected to one end of capacitor C2, and the other end of capacitor C2 is connected to reference ground. The emitter of transistor Q1 is also connected to the power supply terminal of the controller. The cathode of Zener diode ZD1 is connected to the base of transistor Q1, and the anode of Zener diode ZD1 is connected to reference ground.

[0062] The linear buck converter works as follows: Low-voltage DC power from the AC / DC converter is introduced through the LED+ terminal, turning on transistor Q1 to output 5V power to supply controller U2 and charge capacitor C2. When the output voltage exceeds the forward voltage of Zener diode ZD1, ZD1 turns on, pulling the base of transistor Q1 low and turning it off. Controller U2 continues to be powered through capacitor C2. Power is supplied to controller U2 only when the low-voltage DC power output from the AC / DC converter (LED+) falls below the forward voltage of Zener diode ZD1. Then, transistor Q1 turns on again, continuing to output 5V power to supply controller U2 and charge capacitor C2.

[0063] See Figure 3 and Figure 5 The air conditioner sterilization power supply circuit and device further include: an indicator light circuit, which includes an LED light. The indicator light circuit is connected to the main control circuit to indicate the working status of the first sterilization device and / or the second sterilization device under the control of the main control circuit. Figure 3 As shown, the indicator circuit may include a light-emitting diode (LED1), which can be turned on or off by a controller U2 in the main control circuit according to its operating status, thereby indicating the operating status. In another embodiment, as... Figure 5 As shown, LED2 can also be brought out through an interface so that it can be placed in a more conspicuous place such as the housing.

[0064] See Figure 2 The AC / DC conversion circuit includes an AC input circuit, a bridge rectifier and filter circuit, and a step-down circuit. The AC input circuit includes a varistor VR1, a common-mode inductor LF1, and a safety capacitor CX1. The varistor VR1 is connected in parallel to the AC mains input terminal, the common-mode inductor LF1 is connected in series in the AC mains power supply circuit, and the safety capacitor CX1 is connected in parallel in the AC mains power supply circuit. By connecting the varistor VR1, common-mode inductor LF1, and safety capacitor CX1 in series and parallel in the power return circuit, abnormal signals introduced at the plug / socket JP3 can be filtered out, ensuring the signal stability of the downstream circuit.

[0065] The bridge rectifier filter circuit includes a second rectifier bridge BD1, a third capacitor C5, a fourth capacitor C3, a first inductor L1, and a second inductor L2. The input terminal of the second rectifier bridge BD1 is connected to the output terminal of the AC input circuit. The two ends of the third capacitor C5 are respectively connected to the two output terminals of the second rectifier bridge BD1. One end of the first inductor L1 is connected to the positive output terminal of the second rectifier bridge BD1, and the other end of the first inductor L1 is connected to one end of the fourth capacitor C3. One end of the second inductor L2 is connected to the negative output terminal of the second rectifier bridge BD1, and the other end of the fourth capacitor C3 is connected to the other end of the second inductor L2. The second rectifier bridge BD1 rectifies the AC power output from the AC input circuit into half-wave DC power. The third capacitor C5, the fourth capacitor C3, the first inductor L1, and the second inductor L2 form a filter circuit, thereby filtering the AC power into stable high-voltage DC power.

[0066] The step-down circuit is connected to the bridge rectifier and filter circuit to convert the high-voltage DC output from the bridge rectifier and filter circuit into low-voltage DC. For example... Figure 2 As shown, the step-down circuit includes: a transformer circuit, a pulse signal modulation circuit, and an auxiliary coil circuit. The transformer circuit includes a transformer T1A and an output filter circuit. The primary coil of the transformer T1A is connected to the output terminal of the bridge rectifier filter circuit, and the secondary coil of the transformer T1A is connected to the output filter circuit. The output filter circuit includes a diode D1 and a second capacitor C4. The anode of the diode D1 is connected to one end of the secondary coil of the transformer T1A, the cathode of the diode D1 is connected to one end of the second capacitor C4, and the other end of the second capacitor C4 is connected to the other end of the secondary coil of the transformer T1A. The pulse signal modulation circuit includes a power controller. The modulation control terminal SW of the power controller is connected to the secondary coil of the transformer T1A to perform transformer modulation control on the transformer T1A. The auxiliary coil circuit is used to provide operating power to the power controller.

[0067] The buck converter circuit operates as follows: An adjustment signal is output from the SW signal terminal of the power controller U2, which adjusts the PWM pulse width of the primary coil of transformer T1A. This adjusted power signal is then transformed by transformer T1A and output to the output filter circuit. Diode D1 and capacitor C4 filter the PWM power signal into a DC voltage, which is then output through the VO signal terminal and low-voltage interfaces JP1 and J1. A sterilization device can be connected via low-voltage interface JP1 to power the sterilization device. The auxiliary coil circuit outputs a feedback power supply VF through the auxiliary coil of transformer T1. After rectification by diode D3 and filtering by capacitor C13, this power supply powers the power controller. Additionally, the feedback power supply VF can be fed back to the voltage detection terminal of the power controller U2 via resistor R12. The power controller U2 outputs a corresponding PWM adjustment signal based on the detected voltage to ensure the stability of the low-voltage DC power output by the buck converter circuit.

[0068] On the other hand, this utility model embodiment also provides an air conditioner sterilization power supply device 10, including: a housing and the aforementioned air conditioner sterilization power supply circuit, wherein the air conditioner sterilization power supply circuit is installed inside the housing. Figure 6 As shown, the low-voltage DC power and control signals of the air conditioning sterilization power supply device 10 can be sent to the outside via a USB connection cable, thereby providing power and operation control for the first sterilization converter 20 and the second sterilization device 30.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An air conditioner sterilization power supply circuit, characterized in that, include: An AC / DC conversion circuit is used to power an air conditioner with AC mains power and to convert AC mains power into low-voltage DC power. The main control circuit is provided with the low-voltage DC output terminal of the AC-DC conversion circuit connected to the main control circuit to supply power to the main control circuit. A channel control circuit is provided, which is connected to the main control circuit. The channel control circuit includes a first switch channel and a second switch channel. The first switch channel is used to connect to a first sterilization device, and the second switch channel is used to connect to a second sterilization device. The main control circuit is used to control the sterilization switch of the first sterilization device through the first switch channel, and the main control circuit is also used to control the sterilization switch of the second sterilization device through the second switch channel.

2. The air conditioner sterilization power supply circuit according to claim 1, characterized in that, Also includes: A current detection circuit is connected to the main control circuit. The main control circuit is used to detect the power supply current of the air conditioner through the current detection circuit, and when the power supply circuit detects that the air conditioner is in working condition, it controls the first sterilization device and / or the second sterilization device to start sterilization through the channel control circuit.

3. The air conditioner sterilization power supply circuit according to claim 2, characterized in that, The current detection circuit includes: A current transformer circuit includes a transformer (T3) and a first rectifier bridge (BD2). The primary coil of the transformer (T3) is connected in series in the power supply circuit of the air conditioner. The secondary coil of the transformer (T3) is connected to the first rectifier bridge (BD2). The first rectifier bridge (BD2) is used to rectify and output the induced signal output from the secondary coil of the transformer (T3). The signal acquisition circuit includes a first resistor (R6) and a second resistor (R26). One end of the first resistor (R6) is connected to the positive output terminal of the first rectifier bridge (BD2), and the other end of the first resistor (R6) is connected to one end of the second resistor (R26). The other end of the second resistor (R26) is connected to a reference ground. The main control circuit includes a controller, and the current detection terminal of the controller is connected to the common terminal of the first resistor (R6) and the second resistor (R26) through a third resistor (R5).

4. The air conditioner sterilization power supply circuit according to claim 3, characterized in that, The current inductance circuit also includes: The first capacitor (C6) has one end connected to the positive output terminal of the first rectifier bridge (BD2) and the other end connected to the reference ground. The first capacitor (C6) is used to regulate the output voltage of the signal from the first rectifier bridge (BD2). A fourth resistor (R7) is connected at one end to one end of the first capacitor (C6), and at the other end of the fourth resistor (R7) is connected to the other end of the first capacitor (C6).

5. The air conditioner sterilization power supply circuit according to claim 3, characterized in that, The signal acquisition circuit also includes: An overvoltage protection diode (ZD2) is provided, wherein the cathode of the overvoltage protection diode (ZD2) is connected to the other end of the first resistor (R6), and the other end of the overvoltage protection diode (ZD2) is connected to a reference ground. The second capacitor (C4) has one end connected to the current detection terminal of the controller and the other end connected to the reference ground.

6. The air conditioner sterilization power supply circuit according to claim 3, characterized in that, The main control circuit also includes a linear buck circuit, which is used to step down the low-voltage DC power output from the AC-DC conversion circuit to power the controller.

7. The air conditioner sterilization power supply circuit according to claim 6, characterized in that, The linear buck circuit includes: A transistor (Q1) is used, wherein the collector of the transistor (Q1) is connected to the low-voltage DC output terminal of the AC-DC conversion circuit, the collector of the transistor (Q1) is also connected to the base of the transistor (Q1) through a fifth resistor (R2), the emitter of the transistor (Q1) is connected to one end of a capacitor C2, the other end of the capacitor C2 is connected to a reference ground, and the emitter of the transistor (Q1) is also connected to the power supply terminal of the controller. A Zener diode (ZD1) is provided, wherein the cathode of the Zener diode (ZD1) is connected to the base of the transistor (Q1), and the anode of the Zener diode (ZD1) is connected to a reference ground.

8. The air conditioner sterilization power supply circuit according to claim 1, characterized in that, Also includes: An indicator light circuit, including an LED, is connected to the main control circuit to indicate the working status of the first sterilization device and / or the second sterilization device under the control of the main control circuit.

9. The air conditioner sterilization power supply circuit according to claim 1, characterized in that, The AC / DC conversion circuit includes: An AC input circuit includes a varistor (VR1), a common-mode inductor (LF1), and a safety capacitor (CX1). The varistor (VR1) is connected in parallel to the AC mains input terminal, the common-mode inductor (LF1) is connected in series in the AC mains power supply circuit, and the safety capacitor (CX1) is connected in parallel in the AC mains power supply circuit. A bridge rectifier filter circuit includes a second rectifier bridge (BD1), a third capacitor (C5), a fourth capacitor (C3), a first inductor (L1), and a second inductor (L2). The input terminal of the second rectifier bridge (BD1) is connected to the output terminal of the AC input circuit. The two ends of the third capacitor (C5) are respectively connected to the two output terminals of the second rectifier bridge (BD1). One end of the first inductor (L1) is connected to the positive output terminal of the second rectifier bridge (BD1), and the other end of the first inductor (L1) is connected to one end of the fourth capacitor (C3). One end of the second inductor (L2) is connected to the negative output terminal of the second rectifier bridge (BD1), and the other end of the fourth capacitor (C3) is connected to the other end of the second inductor (L2). A step-down circuit is provided, which is connected to the bridge rectifier filter circuit to convert the high-voltage DC output from the bridge rectifier filter circuit into low-voltage DC.

10. An air conditioner sterilization power supply device, characterized in that, include: case; The air conditioner sterilization power supply circuit according to any one of claims 1 to 9, wherein the air conditioner sterilization power supply circuit is installed inside the housing.

Images