Voltage stabilizing circuit for air conditioner gateway

Abstract

The utility model relates to the technical field of voltage stabilizing circuits, in particular to a voltage stabilizing circuit for an air-conditioning gateway, which comprises a power transformer T and two groups of 12V voltage circuits, one group of 12V voltage circuits comprises rectifier tubes VD1 to VD4 and a filter Cl, and the filter Cl is electrically connected with a comparator ICA and a comparator ICB; and the other group of 12V voltage circuit comprises a rectifier tube VD5, a capacitor C2 and a capacitor C3, and the capacitor C3 is electrically connected with the comparator ICA and the comparator ICB through a potentiometer RP1 and a potentiometer RP2. According to the utility model, the stable output voltage range is 200V-240V, the rated power is 2.5 kW, the transformer is adopted for isolated power supply and sampling, the debugging and maintenance safety is ensured, the voltage stabilizer is provided with the high-stability benchmark reference voltage source and the two-stage control circuit, the whole circuit is based on a single-chip double-operational-amplifier integrated circuit, the work is stable and reliable, and the anti-interference performance is good.

Description

Technical Field

[0001] The utility model relates to a voltage stabilizing circuit, in particular to a voltage stabilizing circuit for an air-conditioning gateway, and belongs to the technical field of voltage stabilizing circuits. Background Art

[0002] With the growth of the economy, air conditioners have gradually entered thousands of households. However, due to the peak period of electricity consumption, the voltage will be unstable, and a voltage stabilizing circuit needs to be installed. However, the general voltage stabilizing circuit structure is relatively complex and the price is relatively high. The main functions of the voltage stabilizing circuit are:

[0003] Stabilize voltage: Convert unstable input voltage, such as voltage changes caused by mains voltage fluctuations and load changes, into a stable and reliable output voltage;

[0004] Protection circuit: prevents electronic components inside the gateway from being damaged due to excessively high or low voltage;

[0005] However, the existing voltage stabilizing circuit is relatively complex, unstable in operation, and has low anti-interference ability.

[0006] Therefore, it is urgent to improve the voltage stabilizing circuit of the air conditioning gateway to solve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide a voltage stabilizing circuit for an air conditioning gateway, with a stable output voltage range of 200V to 240V and a rated power of 2.5kW. It uses a transformer to isolate power supply and sampling to ensure safe debugging and maintenance. The voltage stabilizer has a high-stability reference voltage source and a two-stage control circuit. The entire circuit is based on a monolithic dual-op-amp integrated circuit, with stable and reliable operation and good anti-interference performance.

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0009] A voltage stabilizing circuit for an air conditioning gateway includes a power transformer T and two 12V voltage circuits electrically connected to one side of the power transformer T. One of the 12V voltage circuits includes rectifiers VD1 to VD4 and a filter C1. Comparators ICA and ICB are electrically connected to the filter C1.

[0010] Another set of the 12V voltage circuit includes a rectifier tube VD5, a capacitor C2 and a capacitor C3. The capacitor C3 is electrically connected to the comparator ICA and the comparator ICB through the potentiometer RP1 and the potentiometer RP2.

[0011] Preferably, one side of the power transformer T is electrically connected to a power plug CT, a relay K1 and a relay K2 are connected between the power transformer T and the power plug CT, and a selection switch SB1 is electrically connected between the relay K1 and the relay K2;

[0012] A fuse Fu is electrically connected between the relay K1 and the power plug CT.

[0013] Preferably, the VD1 to VD4 rectifier tubes are arranged in parallel with the filter C1, a resistor R1 and an LED 1 are arranged in parallel on the filter C1, and the resistor R1 and the LED 1 are connected in series.

[0014] Preferably, a resistor R2 is electrically connected to the resistor R1 , and the resistor R2 is electrically connected to the comparator ICA and the comparator ICB.

[0015] Preferably, the capacitor C2 and the capacitor C3 are connected in parallel and electrically connected to the rectifier tube VD5, and the potentiometer RP1 and the potentiometer RP2 are arranged in parallel on the capacitor C3.

[0016] Preferably, the pins 1 of the comparator ICA and the comparator ICB are electrically connected to a dual-color light-emitting diode LED2, and the dual-color light-emitting diode LED2 includes a green LED G and a red LED R.

[0017] Resistors R3 , R4 and R5 are electrically connected between the comparator ICA and the comparator ICB, and a resistor R6 is electrically connected between the comparator ICB and the dual-color light-emitting diode LED2 .

[0018] Preferably, a resistor R5 is electrically connected between the comparator ICA and the dual-color light-emitting diode LED2 , the comparator ICA is connected to the field effect transistor VT1 via a resistor R7 , and the comparator ICB is electrically connected to the field effect transistor VT2 via a resistor R8 .

[0019] Preferably, the field effect transistor VT1 is electrically connected to a relay K11, a diode VD7 is provided in parallel to the relay K11, the field effect transistor VT2 is electrically connected to a relay K22, a diode VD8 is provided in parallel to the relay K22, and a capacitor C4 is electrically connected between the field effect transistor VT1 and the field effect transistor VT2.

[0020] The utility model has at least the following beneficial effects:

[0021] 1. When the input voltage is 170V~270V, the stable output voltage range is 200V~240V, and the rated power is 2.5kW. Transformer isolation power supply and sampling are used to ensure the safety of debugging and maintenance. The voltage stabilizer has a high-stability reference voltage source and a two-stage control circuit. The entire circuit is based on a monolithic dual-op-amp integrated circuit, which has stable and reliable operation and good anti-interference performance.

[0022] 2. Therefore, the input voltage is directly sent to the output socket C2 without any step-up or step-down. When the input voltage is lower than 200V, relay K1 is energized and relay K2 is still in the released state. At this time, the input is connected to the C terminal of T, thereby increasing the output voltage. When the input voltage is higher than 240V, relay K2 is energized and relay K1 is released. At this time, the input is connected to the B terminal of T, thereby reducing the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0025] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] like Figure 1 As shown, the voltage stabilizing circuit for the air conditioning gateway provided in this embodiment has a stable output voltage range of 200V to 240V when the input voltage is 170V to 270V, and a rated power of 2.5kW. It uses a transformer to isolate power supply and sampling to ensure debugging and maintenance safety. The voltage stabilizer has a high-stability reference voltage source and a two-stage control circuit. The entire circuit is based on a monolithic dual-op-amp integrated circuit, and has stable and reliable operation and good anti-interference performance. It includes a power transformer T and two groups of 12V voltage circuits electrically connected to one side of the power transformer T. One group of 12V voltage circuits includes VD1 to VD4 rectifier tubes and a filter Cl. The filter Cl is electrically connected to the comparator ICA and the comparator ICB. The secondary of the power transformer T takes out two sets of 12V voltages. One set is rectified by rectifier tubes VD1~VD4 and filtered by filter Cl to provide 12V DC working voltage for dual op amp LM358 and relays K1 and K2. At the same time, it passes through resistor R2 and is stabilized by diode VD6 to 5.6V, which serves as the reference voltage for comparators ICA and ICB.

[0027] Another 12V voltage circuit includes a rectifier tube VD5, capacitors C2, and capacitors C3. Capacitor C3 is electrically connected to comparators ICA and ICB via potentiometers RP1 and RP2. Another group uses diode VD5 for rectification and capacitors C2 and C3 for noise reduction filtering to produce a power supply error sampling voltage. After adjustment by potentiometers RP1 and RP2, it serves as the comparison signal for comparators ICA and ICB. The primary of the power transformer T also serves as a voltage regulator. There are three plugs for 240V, 220V, and 200V for the contacts of relays K1 and K2 to select. Capacitor C2 is the output power socket, and SBI is the selection switch. The voltage regulator has a highly stable reference voltage source and a two-stage control circuit. The entire circuit is based on a monolithic dual-op amp integrated circuit, which operates stably and reliably with excellent anti-interference performance.

[0028] Further, such as Figure 1 As shown, one side of the power transformer T is electrically connected to a power plug CT. Relays K1 and K2 are connected between the power transformer T and the power plug CT. A selector switch SB1 is electrically connected between relays K1 and K2. A fuse Fu is electrically connected between relay K1 and the power plug CT. Rectifiers VD1 to VD4 are arranged in parallel with a filter C1. Resistor R1 and LED1 are arranged in parallel on filter C1. Resistor R1 and LED1 are connected in series. Resistor R2 is electrically connected to resistor R1. Resistor R2 is electrically connected to comparators ICA and ICB. Capacitors C2 and C3 are connected in parallel and then electrically connected to rectifier VD5. Potentiometers RP1 and RP2 are arranged in parallel on capacitor C3. When the input voltage VIN = 200V to 240V, relays K1 and K2 do not operate, and their contacts are in the normally closed position. Therefore, the input voltage is directly sent to the output socket C2 without any step-up or step-down. The output voltage VOUT = VIV.

[0029] When the input voltage is lower than 200V, relay K1 is closed and relay K2 is still in the released state. At this time, the input is connected to the C terminal of T, thereby increasing the output voltage. According to the measured data, when VIN=170V~200V, the output VOUT=205V~240V;

[0030] When the input voltage is higher than 240V, relay K2 is closed and relay K1 is released. At this time, the input is connected to the B terminal of T, so that the output voltage is reduced.

[0031] When VIN=240V~270V, VOUT=210V~240V.

[0032] Further, if Figure 1As shown, pins 1 of comparators ICA and ICB are electrically connected to a dual-color light-emitting diode LED2, which includes a green LED G and a red LED R.

[0033] Resistors R3, R4, and R5 are electrically connected between comparator ICA and comparator ICB. Resistor R6 is electrically connected between comparator ICB and bi-color light-emitting diode LED2. Resistor R5 is electrically connected between comparator ICA and bi-color light-emitting diode LED2. Comparator ICA is connected to field-effect transistor VT1 via resistor R7. Comparator ICB is electrically connected to field-effect transistor VT2 via resistor R8. Field-effect transistor VT1 is electrically connected to relay K11. Relay K11 is connected in parallel with diode VD7. Field-effect transistor VT2 is electrically connected to relay K22. Relay K22 is connected in parallel with diode VD8. Capacitor C4 is electrically connected between field-effect transistor VT1 and field-effect transistor VT2. LED1 serves as a power indicator, and bi-color light-emitting diode LED2 serves as an input voltage indicator. When VIN is less than 200V, LED2's green tube G lights up.

[0034] When VIN>240V, the red tube R of LED2 is on;

[0035] When VIN=200V~240V, both LED2 tubes are off;

[0036] like Figure 1 As shown, the debugging method for the voltage stabilizing circuit of the air conditioning gateway provided in this embodiment is:

[0037] Turn the potentiometer RP1 to the upper end and the potentiometer RP2 to the lower end;

[0038] Plug in the power plug CT, use another high-precision voltage regulator to make the input voltage of the power plug CT 200V, and slowly adjust the potentiometer RP1 downwards so that the relay Kl is just closed and the dual-color light-emitting tube LED2 emits green light.

[0039] Set the input voltage of the power plug CT to 240V, and slowly increase the potentiometer RP2 until the relay K2 is just closed and the dual-color light-emitting tube LED2 turns red.

[0040] When the input voltage is within the range of 170V to 270V, the output voltage and the brightness of the dual-color LED2 should change in three sections as shown in the attached table. Otherwise, readjustment is required. If repeated adjustments still deviate significantly from the attached table, check whether the FET VT1, FET VT2, relay K1, and relay K2 are defective, whether the core of the transformer T is too loose, and whether the air gap is too large.

[0041] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0042] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0043] The above description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A voltage stabilizing circuit for an air conditioning gateway, comprising a power transformer T and two sets of 12V voltage circuits electrically connected to one side of the power transformer T, characterized in that: A set of the 12V voltage circuits includes rectifier tubes VD1 to VD4 and a filter C1, wherein the filter C1 is electrically connected to a comparator ICA and a comparator ICB; Another set of the 12V voltage circuit includes a rectifier tube VD5, a capacitor C2 and a capacitor C3. The capacitor C3 is electrically connected to the comparator ICA and the comparator ICB through the potentiometer RP1 and the potentiometer RP2.

2. The voltage stabilizing circuit for an air conditioning gateway according to claim 1, characterized in that: One side of the power transformer T is electrically connected to a power plug CT, a relay K1 and a relay K2 are connected between the power transformer T and the power plug CT, and a selection switch SB1 is electrically connected between the relay K1 and the relay K2; A fuse Fu is electrically connected between the relay K1 and the power plug CT.

3. The voltage stabilizing circuit for an air conditioning gateway according to claim 1, characterized in that: The VD1 to VD4 rectifier tubes are connected in parallel with the filter C1. The filter C1 is connected in parallel with a resistor R1 and an LED 1. The resistor R1 and the LED 1 are connected in series.

4. The voltage stabilizing circuit for an air conditioning gateway according to claim 3, characterized in that: The resistor R1 is electrically connected to a resistor R2 , and the resistor R2 is electrically connected to the comparator ICA and the comparator ICB.

5. The voltage stabilizing circuit for an air conditioning gateway according to claim 1, characterized in that: The capacitor C2 and the capacitor C3 are connected in parallel and are electrically connected to the rectifier tube VD5 . The potentiometer RP1 and the potentiometer RP2 are arranged in parallel on the capacitor C3 .

6. The voltage stabilizing circuit for an air conditioning gateway according to claim 1, characterized in that: Pins 1 of the comparator ICA and the comparator ICB are electrically connected to a dual-color light-emitting diode LED2, which includes a green LED G and a red LED R. Resistors R3 , R4 and R5 are electrically connected between the comparator ICA and the comparator ICB, and a resistor R6 is electrically connected between the comparator ICB and the dual-color light-emitting diode LED2 .

7. The voltage stabilizing circuit for an air conditioning gateway according to claim 1, characterized in that: A resistor R5 is electrically connected between the comparator ICA and the dual-color light-emitting diode LED2 . The comparator ICA is connected to the field effect transistor VT1 via a resistor R7 . The comparator ICB is electrically connected to the field effect transistor VT2 via a resistor R8 .

8. The voltage stabilizing circuit for an air conditioning gateway according to claim 7, characterized in that: The field effect transistor VT1 is electrically connected to a relay K11, and a diode VD7 is provided in parallel with the relay K11. The field effect transistor VT2 is electrically connected to a relay K22, and a diode VD8 is provided in parallel with the relay K22. A capacitor C4 is electrically connected between the field effect transistor VT1 and the field effect transistor VT2.

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