CN206992780U - A kind of air conditioner power supply switches anti-halt circuit and air conditioner - Google Patents

Abstract

A kind of air conditioner power supply switches anti-halt circuit, including mains supply output end, stand-by power supply output end, switching switch and electricity accumulating unit, wherein the switching switch includes first input end, the second input and output end；The mains supply output end connects the first input end, and the stand-by power supply output end connects second input, and the output end connects the power end of air conditioner control chip by the electricity accumulating unit.Also include a kind of air conditioner.Air conditioner power supply disclosed in the utility model switches anti-halt circuit; the moment of switching mains supply and standby switching can be switched in switching; by electricity accumulating unit power supply signal is provided for air conditioner control chip; avoid the erroneous judgement of air conditioner control chip from entering idle protection state and cause air conditioner to be shut down, solve the problems, such as that air conditioner can not restart in a period of time after power supply switching.

Description

Air conditioner power switching anti-shutdown circuit and air conditioner

technical field

The utility model relates to the technical field of air conditioning, in particular to an air conditioner power switch anti-shutdown circuit and an air conditioner comprising the air conditioner power switch anti-shutdown circuit.

Background technique

In some countries and regions with relatively backward economies, such as Ethiopia in Africa and Pakistan in Asia, the coverage rate of power users is only 20% to 40%, and the quality of power supply is also very poor, with large fluctuations in power supply voltage and frequency, and waveform distortion. Seriously, at the same time the power supply may be interrupted at any time. Ordinary household appliances, such as lighting equipment, are generally powered by batteries.

However, for hospitals, bank clearing centers, civil aviation, meteorology and other departments, air conditioners are also required to maintain normal work at the same time, and unstable power supply has seriously affected the use of air conditioners. For the air conditioner with backup power supply, the user must frequently operate the backup power supply to supply power when the mains power is interrupted, and the power supply interval is longer. In addition, when the backup power supply and the mains power supply are switched, there may be a switching time of several hundred milliseconds, during which time the power supply of the control chip of the air conditioner indoor unit will be interrupted. The indoor unit control chip will enter the standby protection program due to power supply interruption, and control the compressor and fan to stop. Usually the standby protection program is set to 3 minutes. During this period of time, even if the power supply of the backup power supply is normal, the air conditioner will remain in the shutdown state, seriously affecting the user experience.

Contents of the invention

The utility model provides an air conditioner power switching anti-shutdown circuit, which prevents the air conditioner control chip from misjudging that it enters the standby protection state during the switching process of the mains power supply and the standby power supply, causing the air conditioner to stop and affecting the actual experience of users.

The utility model provides an anti-shutdown circuit for power supply switching of an air conditioner, which includes an output terminal of a mains power supply, an output terminal of a backup power supply, a switching switch and a power storage unit, wherein the switching switch includes a first input terminal, a second input terminal and an output terminal; the output terminal of the commercial power supply is connected to the first input terminal, the output terminal of the backup power supply is connected to the second input terminal, and the output terminal is connected to the power supply terminal of the air conditioner control chip through the power storage unit.

Further, the electric storage unit is at least one supercapacitor.

In order to charge the electric storage unit, it also includes a charging circuit for the electric storage unit; the charging circuit for the electric storage unit includes a rectifier circuit, a linear voltage regulator and a constant current source circuit connected in sequence; the control terminal of the linear voltage regulator receives An electrical signal generated and output by the first control circuit.

Preferably, the first control circuit is a single-chip microcomputer.

Further, an inverter is also included, the input end of the inverter is connected to the output end of the backup power supply, and the output end of the inverter is connected to the second input end.

Preferably, the changeover switch is a dual switch, one of the selected terminals of the dual switch is the first input terminal, and the other selected terminal is the second input terminal.

Preferably, the switch is a relay.

The air conditioner power switching anti-shutdown circuit disclosed by the utility model can provide a power supply signal for the air conditioner control chip through the power storage unit at the moment when the switch switches the mains power supply and the standby switch, so as to avoid the air conditioner control chip from misjudging and entering the standby mode. The protection state causes the air conditioner to shut down and cannot be restarted for a period of time.

The utility model also discloses an air conditioner, which includes an air conditioner power supply switching anti-shutdown circuit. The air conditioner power supply switching anti-shutdown circuit includes a mains power supply output terminal, a backup power supply output terminal, a switch and an electric storage unit, wherein the switch includes a first input terminal, a second input terminal and an output terminal; The output end of the electric power supply is connected to the first input end, the output end of the standby power supply is connected to the second input end, and the output end is connected to the power end of the air conditioner control chip through the power storage unit.

In the air conditioner disclosed by the utility model, the switching process of the mains power supply and the standby power supply is gentle, and no shutdown phenomenon occurs, thus improving the actual experience of users.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appended drawings in the following description The drawings are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings on the premise of not paying creative labor.

Fig. 1 is a structural schematic block diagram of the first embodiment of the air conditioner power switching anti-shutdown circuit disclosed by the utility model;

Fig. 2 is a schematic diagram of the first type of circuit structure of the switch in the anti-shutdown circuit for power switching of the air conditioner shown in Fig. 1 .

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to FIG. 1 , it is a schematic block diagram of the circuit principle of the first embodiment of the air conditioner power switching anti-shutdown circuit disclosed by the utility model. As shown in Figure 1, the air conditioner power supply switching anti-shutdown circuit disclosed in the utility model includes the mains power supply output terminal S1 arranged on the mains power supply 1 side, the standby power supply output terminal S2 set on the standby power supply 2 side and Toggle switch 5. The mains power supply 1 is a mains power supply 1 with a nominal value of 220V, which provides a mains power supply signal. When the mains power supply is supplied, the 220V AC output from the output port S1 of the mains power supply passes through the protection circuit and the transformer primary, steps down and outputs a 13.5V voltage signal, and further passes through rectification and filtering to output a 12V DC power. On the one hand, it provides power for the relays in the air conditioner Operating Voltage. On the other hand, the 12V direct current outputs 5V through the three-terminal regulator to provide the working voltage for the air conditioner control chip 6 . The air-conditioner control chip 6 is preferably a single-chip microcomputer, and a plurality of independent output ports of the air-conditioner control chip 6 output drive signals to respectively drive the relays connected with the outdoor fan, the indoor fan, the compressor, and the four-way valve to suck or disconnect, Control the operation and stop of each equipment. Backup power supply 2 is preferably a storage battery or a storage battery pack, and its capacity is advisable to make the air conditioner work for several hours. The power supply from the battery or battery pack passes through the inverter, which outputs high-quality AC signals. When the backup power supply is used, the transmission process of the power signal is basically the same as that of the mains power supply, and will not be repeated here. A switch button (not shown) is preferably arranged on one side of the backup power supply 2. When the switch button is pressed, the backup power supply 2 is in a standby state. On the one hand, if the mains power supply is interrupted or abnormal, then the switch 5 acts to supply power to the air conditioner through the backup power supply 2 . In order to protect the equipment from frequent restarts, if the power supply pin of the air conditioner control chip 6 has no working voltage input, the air conditioner control chip 6 controls the outdoor fan, the indoor fan and the compressor to stop working. Under the control of the delay circuit or the program, the air conditioner control chip 6 will not re-output the drive signal within a certain period of time, and the air conditioner will not be turned on within this period of time.

Completely different from the prior art, in order to prevent the control chip 6 of the air conditioner from misjudging the power at the moment of switching and entering into standby protection, an electric storage unit 4 is also included. As shown in the figure, the switch 5 includes a first input terminal I1, a second input terminal I2 and an output terminal P0, the output terminal S1 of the mains power supply is connected to the first input terminal I1, and the output terminal S2 of the standby power supply is connected to the second input terminal I2. The output terminal P0 is connected to the power supply pin V of the air conditioner control chip 6 through the rectification circuit and the power storage unit 4 . When the mains power supply 1 is normal, the output terminal S1 of the mains power supply is connected to the output terminal P0 through the first input terminal I1 of the switch 5, and supplies power to the air conditioner control chip 6 according to the above-mentioned electric signal transmission process. When the mains power supply 1 is interrupted, the switch 5 acts, and in the next working state, the output terminal S2 of the backup power supply is connected to the output terminal P0 through the second input terminal I2 of the switch 5, and the backup power supply 2 will continue to supply power to the air conditioner. This switching action takes about 1 second to complete. During the switching interval, the power storage unit 4 starts to supply power to the air conditioner control chip 6, and there is no switching gap in the middle, which prevents the control chip from determining that the power supply is interrupted and enters the shutdown state. The power storage unit 4 is preferably at least one supercapacitor, and the power of the supercapacitor is preferably sufficient for the normal operation of the air conditioner control chip 6 for one second.

The air conditioner power switching anti-shutdown circuit disclosed in the above embodiments can prevent the air conditioner from entering the standby protection state due to misjudgment by the air conditioner control chip at the moment of switching the switch, and ensure that the air conditioner does not stop.

After the electric storage unit 4 is discharged, it needs to be recharged. In order to charge the electric storage unit 4 , as shown in FIG. 2 , a charging circuit for the electric storage unit is also included. Specifically, the charging circuit for the electric storage unit includes a transformer (not shown in the figure), a rectifier circuit 7 , a linear voltage regulator 9 and a constant current source circuit 10 connected in sequence. The control terminal of the linear regulator 9 receives the electrical signal generated and output by the first control circuit 8 . The commercial power supply voltage output by the rectification circuit 7 passes through the linear voltage regulator 9 . The linear voltage regulator 9 stabilizes the mains power supply voltage at the upper limit voltage of the electric storage unit 4, that is, the set charging voltage of the supercapacitor, preferably slightly higher than the upper limit voltage. The output of the linear voltage regulator 9 passes through the constant current source circuit 10 to obtain a stable current for charging the supercapacitor. The above-mentioned transformer, rectifier circuit 7, linear voltage regulator 9 and constant current source circuit 10 all select common circuit structures in the prior art, and only need to design peripheral circuits according to the capacity of the required supercapacitor, and keep the set charging voltage slightly The voltage is higher than the upper limit, and the current meets the charging requirements of the supercapacitor. If the designed supercapacitor has a large capacity, it is also preferable to set a charging voltage detection circuit to detect the real-time voltage value of the supercapacitor and output it to the first control circuit 8 . When the real-time voltage of the supercapacitor is equal to the upper limit voltage, the first control circuit 8 generates an interrupt signal to the control terminal of the linear voltage regulator 9 to stop charging the storage unit 4 to prevent overcharging. The first control circuit 8 is preferably a single-chip microcomputer.

More specifically, the changeover switch 5 can be realized by a two-way changeover switch or a relay. The two-way transfer switch is provided with two selected terminals, which are respectively used as the first input terminal I1 and the second input terminal I2 of the switching unit 5 to be connected to the mains power supply terminal S1 and the backup power supply terminal S2 respectively, and the two selected terminals Select the terminal to realize the switch between the mains power supply and the backup power supply.

The switch 5 can also be a relay. When a relay is used as the switch 5, the coil of the relay receives 12V power supply. When the mains power supply 1 is normal, the relay coil is energized to further drive the contact to act. For the relay, one end of the normally open contact of the relay is connected to the output terminal S1 of the mains power supply as the first input terminal I1, the other end is connected to the air conditioner control chip 6, one end of the normally closed contact of the relay is connected to the output terminal S2 of the standby power supply, and the other end is connected to the output terminal S2 of the standby power supply. One end is connected to the air conditioner control chip 6 . The mains power supply 1 is normal, the relay coil is energized, the normally open contact is closed, the normally closed contact is disconnected, and the air conditioner is powered by the mains power supply 1. If the mains power supply 1 is interrupted, the relay returns to its initial state. The normally open contact is disconnected, the normally closed contact is closed, and the air conditioner is powered by the backup power supply 2 .

When the standby power supply 2 is used for power supply, the output terminal S2 of the standby power supply is connected to the input terminal of the inverter 3, and the output terminal of the inverter 3 is connected to the second input terminal I2.

The utility model also provides an air conditioner using the above air conditioner power switching anti-shutdown circuit. For the structure of the air conditioner power switching anti-shutdown circuit, please refer to the detailed description and depiction of the above-mentioned embodiment and the accompanying drawings, and will not be repeated here. . The air conditioner adopting the above-mentioned air conditioner power switch anti-shutdown circuit can achieve the same technical effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (8)

1. An air conditioner power switch anti-shutdown circuit, characterized in that it comprises a mains power supply output terminal, a backup power supply output terminal, a changeover switch and an electric storage unit, wherein the changeover switch comprises a first input terminal and a second input terminal and the output terminal; the output terminal of the mains power supply is connected to the first input terminal, the output terminal of the backup power supply is connected to the second input terminal, and the output terminal is connected to the power supply of the air conditioner control chip through the power storage unit end. 2. The air conditioner power supply switching anti-shutdown circuit according to claim 1, wherein the power storage unit is at least one supercapacitor. 3. The air-conditioner power switch anti-shutdown circuit according to claim 2, further comprising a charging circuit for an electric storage unit; the charging circuit for the electric storage unit includes a rectifier circuit, a linear voltage regulator and a constant current A source circuit; the control terminal of the linear voltage regulator receives the electrical signal generated and output by the first control circuit. 4. The air conditioner power switching anti-shutdown circuit according to claim 3, wherein the first control circuit is a single-chip microcomputer. 5. The air conditioner power switch anti-shutdown circuit according to claim 3, further comprising an inverter, the input end of the inverter is connected to the output end of the backup power supply, and the output end of the inverter is connected to the second input. 6. The anti-shutdown circuit for air conditioner power switching according to any one of claims 1 to 5, characterized in that, the switch is a two-way changeover switch, and one of the selected ends of the two-way changeover switch is the first input terminal, and the other selected terminal is the second input terminal. 7. The anti-shutdown circuit for air conditioner power switching according to any one of claims 1 to 5, characterized in that the switching switch is a relay. 8. An air conditioner, characterized in that it further comprises the air conditioner power switching anti-shutdown circuit according to any one of claims 1 to 7.