CN216598984U - Power input protection circuit, power circuit and air conditioner - Google Patents
Power input protection circuit, power circuit and air conditioner Download PDFInfo
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- CN216598984U CN216598984U CN202121995755.1U CN202121995755U CN216598984U CN 216598984 U CN216598984 U CN 216598984U CN 202121995755 U CN202121995755 U CN 202121995755U CN 216598984 U CN216598984 U CN 216598984U
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Abstract
The utility model provides a power input protection circuit, a power circuit and an air conditioner, wherein the power input protection circuit comprises a protection module, a rectification module, a power module and a control module; the protection module comprises a thermistor, a first relay and a second relay, the thermistor is connected between the input end of the first alternating current power supply and the first input end of the rectification module in series, and the first relay is connected with the thermistor in parallel; the second input end of the rectification module is connected with the second alternating current power supply input end, and the second relay is connected between the first input end of the rectification module and the second input end of the rectification module in parallel; the control module is connected with the first relay and the second relay and used for controlling the first relay to be disconnected and the second relay to be attracted when the situation that the alternating current input voltage exceeds the limit is detected. The utility model can prevent the high voltage from damaging the controller.
Description
Technical Field
The utility model relates to the technical field of overvoltage protection circuits, in particular to a power input protection circuit, a power circuit and an air conditioner.
Background
At present, most industrial areas, part of urban business centers and residential house-to-home power supplies are three-phase four-wire power supplies, namely 3 live wires +1 zero wire, the voltage among the three live wires is 380V, and the voltages among the three live wires and the zero wire are 220V respectively. When the single-phase Power supply air conditioner is installed after sale in the areas, installers often mistakenly connect the zero line and the live line of the Power supply into two live lines, so that the input Power supply voltage of the air conditioner is as high as 380V and is far higher than the rated working voltage, parts in an air conditioner controller, such as Insulated Gate Bipolar Transistors (IGBT), Intelligent Power Modules (IPM), direct current capacitors and the like, increase the heat productivity due to the increase of leakage current under high voltage, and the parts are easily damaged after the high voltage is electrified for a long time.
SUMMERY OF THE UTILITY MODEL
The problem solved by the utility model is that the device in the controller is damaged due to the overlarge alternating-current input voltage.
In order to solve the above problems, the present invention provides a power input protection circuit, which includes a protection module, a rectification module, a power module and a control module; the input end of the power supply module is connected with the output end of the rectification module, and the output end of the power supply module is connected with the control module so as to supply power to the control module; the protection module comprises a thermistor, a first relay and a second relay, the thermistor is connected between a first alternating current power supply input end and a first input end of the rectification module in series, and the first relay is connected with the thermistor in parallel; the second input end of the rectification module is connected with the second alternating current power supply input end, and the second relay is connected between the first input end of the rectification module and the second input end of the rectification module in parallel; the control module is connected with the first relay and the second relay and used for controlling the first relay to be disconnected and the second relay to be attracted when the situation that the alternating current input voltage exceeds the limit is detected.
When the input alternating voltage is overlarge, the first relay is controlled to be disconnected and the second relay is controlled to be closed, so that the rectifier module is short-circuited, and the thermistor is connected between the two power supply input ends, and the device on the controller can be prevented from being damaged by high voltage.
Optionally, the control module is configured to control the first relay to be closed and the second relay to be opened when detecting that the ac input voltage is normal.
The control module controls the first relay to be closed and the second relay to be opened under the condition that the detected AC input voltage is normal, so that the thermistor is connected between the AC power input end and the rectifier module under the condition that the voltage is normal to play a role in limiting the current, and the rectifier module and the load can work normally.
Optionally, the first relay and the second relay are normally open relays.
The first relay and the second relay are normally open relays, and are both disconnected under the condition of power failure, the thermistor can be connected between the input end of the alternating current power supply and the rectifying module to play a role in limiting the current, and the rectifying module and the load can work normally.
Optionally, the power module is connected to the first relay and the second relay to supply power to the first relay and the second relay.
According to the utility model, the power supply module is connected behind the rectifier module, after overvoltage protection, the rectifier module is short-circuited, so that the power supply module cannot supply power to the first relay and the second relay, the two relays are disconnected, the rectifier module is connected into the circuit again, and the power supply module recovers power supply, thereby realizing circulating overvoltage protection.
Optionally, the rectifier module includes a rectifier bridge and a voltage-stabilizing capacitor; the first input end of the rectifier bridge is connected with one end of the thermistor, and the other end of the thermistor is connected with the first alternating current power supply input end; the second input end of the rectifier bridge is connected with the second alternating current power supply input end; and two ends of the voltage stabilizing capacitor are respectively connected with two output ends of the rectifier bridge.
The rectifier module comprises a voltage stabilizing capacitor, and can store charges to enable the power supply module to maintain working for a certain time, so that the control module can be ensured to normally play an overvoltage protection role.
Optionally, the power supply module includes a switching power supply, and the switching power supply is connected in parallel with the voltage stabilizing capacitor.
Optionally, the switching power supply is connected to the first relay, the second relay, and the control module, respectively.
Optionally, the control module includes a voltage detection circuit, and the voltage detection circuit is connected to the first ac power input end and the second ac power input end.
The power supply module is specifically a switch power supply which can supply power to the relay and the control module, and the control module specifically comprises a voltage detection circuit which can prevent devices on the controller from being damaged by high voltage.
The utility model provides a power supply circuit comprising any one of the power supply input protection circuits.
The utility model provides an air conditioner, which comprises the power supply circuit.
The power supply circuit and the air conditioner provided by the utility model can achieve the same technical effect as the power supply input protection circuit.
Drawings
Fig. 1 is a schematic structural diagram of a power input protection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an equivalent circuit during normal operation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an equivalent circuit for connecting an overrun AC power source according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an equivalent circuit during secondary operation when the overrun ac power supply is connected according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the utility model provides a power input protection circuit which can prevent devices on a controller from being damaged when input alternating-current voltage is overlarge.
The power input protection circuit comprises a protection module, a rectification module, a power module and a control module.
The protection module is connected between the rectification module and the alternating current input end and is used for protecting the rectification module and a load connected with the rectification module from being damaged by high voltage; the rectification module is connected with the power supply module, so that the power supply module outputs direct-current voltage to the control module, and the control module can control the running state of the protection module to play a role in overvoltage protection.
Specifically, the input end of the power supply module is connected to the output end of the rectification module, and the output end of the power supply module is connected with the control module to supply power to the control module.
The protection module comprises a thermistor, a first relay and a second relay, the thermistor is connected between the input end of the first alternating current power supply and the first input end of the rectification module in series, and the first relay is connected with the thermistor in parallel. The second input end of the rectifying module is connected with the second alternating current power supply input end, and the second relay is connected between the first input end of the rectifying module and the second input end of the rectifying module in parallel.
The control module is connected with the first relay and the second relay and used for controlling the first relay to be disconnected and the second relay to be attracted when the situation that the alternating current input voltage exceeds the limit is detected. Under the condition that the voltage exceeds the limit, the second relay is closed, the first relay is disconnected, the rectifier module and a subsequently connected load are short-circuited, and the thermistor is equivalently bridged between the input end of the first alternating current power supply and the input end of the second alternating current power supply. At this time, the current flowing through the thermistor is instantaneously increased, the power consumption is also instantaneously increased, the thermistor rapidly generates heat, and the resistance value of the thermistor is increased along with the temperature rise, so that the protection of a load (such as a controller) and a rectifier module is realized.
According to the power input protection circuit provided by the embodiment of the utility model, when the input alternating voltage is overlarge, the first relay is controlled to be disconnected and the second relay is controlled to be attracted, so that the rectifier module is short-circuited and the thermistor is connected between the two power input ends, and devices on the controller can be prevented from being damaged by high voltage.
And under the condition that the AC input voltage is detected to be normal, the control module controls the first relay to be closed and the second relay to be opened. Under the condition that the voltage is normal, the thermistor is connected between the input end of the alternating current power supply and the rectifying module to play a role in limiting the current, and the rectifying module and the load can work normally.
Fig. 1 is a schematic structural diagram of a power input protection circuit of the present invention, which shows a first AC power input terminal AC _ L, a second AC power input terminal AC _ N, a protection module 10, a rectification module 20, a power module 30, a control module 40, and a load 50.
As shown in fig. 1, the thermistor 101 is connected in series between the first AC power input terminal AC _ L and the first input terminal of the rectifier module 20, and the first relay K1 is connected in parallel with the thermistor 101; the second relay K2 is connected in parallel between the first input terminal of the rectifier module 20 and the second input terminal of the rectifier module.
The rectifier module 20 supplies power to the power module 30 and the load 50, the power module 30 includes a 12V power output and a control module power output, the 12V power output is used for supplying power to the first relay K1 and the second relay K2, and the control module power output is used for supplying power to the control module 40.
The control module 40 outputs RY1 control signals and RY2 control signals, which are respectively used for controlling the pull-in and pull-off states of the first relay K1 and the second relay K2. The control module 40 further includes an AC voltage detection circuit connected to the first AC power input terminal AC _ L and the second AC power input terminal AC _ N.
Optionally, the first relay K1 and the second relay K2 are normally open relays.
When the alternating current power supply is just connected, the two relays K1 and K2 are not attracted, and the load circuit is connected with the thermistor in series for current limiting protection. When the power supply voltage signal collected by the control module is a normal voltage signal (generally 220V), the control module outputs a pull-in signal of the first relay K1, so that the first relay K1 is pulled in, the second relay K2 is kept in a disconnected state, the thermistor is short-circuited, and the load and the rectifier bridge can work normally. Fig. 2 shows an equivalent circuit diagram in normal operation, in which the thermistor 101 is connected between the first AC power input terminal AC _ L and the rectifier bridge 201.
As shown in fig. 1, the rectifier module 20 includes a rectifier bridge 201 and a voltage-stabilizing capacitor 202. A first input terminal of the rectifier bridge 201 is connected to one terminal of the thermistor 101, and the other terminal of the thermistor 101 is connected to the first AC power input terminal AC _ L. A second input end of the rectifier bridge 201 is connected to the second AC power input end AC _ N, and two ends of the voltage-stabilizing capacitor 202 are respectively connected to two output ends of the rectifier bridge 201.
When the control module acquires that the alternating current power supply voltage signal is an over-limit voltage signal (for example, 380V), the control module outputs a pull-in signal of the second relay K2, so that the second relay K2 pulls in, the first relay K1 keeps an off state, the load 50 and the rectifier bridge 201 are short-circuited by the second relay K2, and the load 50 stops working.
Illustratively, the power supply module is a switching power supply, and the switching power supply is connected in parallel with the voltage stabilizing capacitor 202. Optionally, the switching power supply is connected to the first relay K1, the second relay K2, and the control module 40, respectively. Optionally, the thermistor is a Positive Temperature Coefficient (PTC) thermistor.
The switching power supply of the rear stage of the rectifier bridge can continue to operate for a period of time due to the energy storage effect of the voltage stabilizing capacitor 202. The thermistor 101 is bridged across both ends of the ac voltage in this period, the current flowing through the thermistor increases instantaneously, the power consumption also increases instantaneously, and the thermistor rapidly heats up, and the resistance of the thermistor 101 also increases with the temperature rise, which can reach hundreds of kilohms. After the resistance value of the thermistor 101 is increased, the current flowing through the thermistor also rapidly decreases, and according to a power calculation formula P ═ UI, the power consumption of the thermistor also decreases, so that the protection of the load and the rectifier bridge circuit is realized.
In the time period, the switching power supply continues to maintain work, so that the first relay K1 and the second relay K2 can execute the pull-in command of the control module when power is continuously supplied to the two relays. After the switch power supply stops working, the two relays are restored to the normally open state. Fig. 3 shows an equivalent circuit diagram when an overrun AC power supply is connected, in which the thermistor 101 is connected between two AC power supply input terminals AC _ L, AC _ N, and the rectifier bridge 201 and the load 50 are short-circuited.
The operating principle of the switching power supply is described below. The alternating current power supply outputs direct current to supply power to the switching power supply after being rectified by the rectifier bridge and stabilized by the voltage stabilizing capacitor, and the switching power supply outputs a 12V power supply and a control module power supply when working so as to respectively supply power to the two relays and the control module.
When no overvoltage protection occurs, the switching power supply and the load both work normally. When overvoltage protection occurs, because the second relay K2 is closed, the rectifier bridge 201 has no input voltage, at this time, the charge stored in the voltage-stabilizing capacitor 202 can make the switching power supply maintain working for a period of time, and as time increases, the charge stored in the voltage-stabilizing capacitor 202 is finally reduced to be insufficient to maintain the switching power supply working, and the 12V power supply and the control module power supply are both 0V. Because the second relay K2 is a normally open relay, the second relay K2 which is closed at the moment is cut off again due to power failure, the heating power of the thermistor 101 is reduced, the resistance value is gradually reduced, and the voltage at the two ends of the voltage stabilizing capacitor 202 is gradually increased until the switching power supply starts to work again and outputs the control module power supply and the 12V power supply, and then the next circulation protection is carried out.
After the first overvoltage protection, because the temperature of the thermistor body is still higher and the impedance is larger, the voltage drop V on the thermistor is realized1The thermistor, the rectifier bridge and the load are connected in series, and the voltage V is input to two ends of the rectifier bridge and the load2Equal to the input AC voltage VACAnd V1A difference of (i.e. V)2Less than VACAnd overvoltage damage of the load and the switching power supply circuit can not be caused. FIG. 4 shows the equivalent electricity at the time of secondary operation in the case of connection to an overrun AC power sourceSchematic diagram of the circuit, in which the voltage drop at thermistor 101 is V1The voltage applied to the load 50 is V2。
The power input protection circuit provided by the utility model can protect devices on the controller from being damaged by high voltage when the high-voltage power supply is misconnected.
The embodiment of the utility model also provides a power supply circuit which comprises the power supply input protection circuit.
The embodiment of the utility model also provides an air conditioner which comprises the power supply circuit.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A power input protection circuit is characterized by comprising a protection module, a rectification module, a power module and a control module;
the input end of the power supply module is connected with the output end of the rectification module, and the output end of the power supply module is connected with the control module so as to supply power to the control module;
the protection module comprises a thermistor, a first relay and a second relay, the thermistor is connected between a first alternating current power supply input end and a first input end of the rectification module in series, and the first relay is connected with the thermistor in parallel; the second input end of the rectification module is connected with the second alternating current power supply input end, and the second relay is connected between the first input end of the rectification module and the second input end of the rectification module in parallel;
the control module is connected with the first relay and the second relay and used for controlling the first relay to be disconnected and the second relay to be attracted when the situation that the alternating current input voltage exceeds the limit is detected.
2. The power input protection circuit of claim 1, wherein the control module is configured to control the first relay to pull in and the second relay to open when detecting that the ac input voltage is normal.
3. The power input protection circuit of claim 1, wherein the first relay and the second relay are normally open relays.
4. The power input protection circuit of claim 3, wherein the power module is coupled to the first relay and the second relay to provide power to the first relay and the second relay.
5. The power input protection circuit according to any one of claims 1 to 3, wherein the rectification module comprises a rectification bridge and a voltage-stabilizing capacitor;
the first input end of the rectifier bridge is connected with one end of the thermistor, and the other end of the thermistor is connected with the first alternating current power supply input end;
the second input end of the rectifier bridge is connected with the second alternating current power supply input end;
and two ends of the voltage stabilizing capacitor are respectively connected with two output ends of the rectifier bridge.
6. The power input protection circuit of claim 5, wherein the power module comprises a switching power supply connected in parallel with the voltage stabilization capacitor.
7. The power input protection circuit of claim 6, wherein the switching power supply is connected to the first relay, the second relay, and the control module, respectively.
8. The power input protection circuit according to any one of claims 1 to 3, wherein the control module comprises a voltage detection circuit, and the voltage detection circuit is connected with the first AC power input end and the second AC power input end.
9. A power supply circuit comprising the power supply input protection circuit of any one of claims 1-8.
10. An air conditioner characterized by comprising the power supply circuit of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121995755.1U CN216598984U (en) | 2021-08-23 | 2021-08-23 | Power input protection circuit, power circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121995755.1U CN216598984U (en) | 2021-08-23 | 2021-08-23 | Power input protection circuit, power circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216598984U true CN216598984U (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121995755.1U Active CN216598984U (en) | 2021-08-23 | 2021-08-23 | Power input protection circuit, power circuit and air conditioner |
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| CN (1) | CN216598984U (en) |
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2021
- 2021-08-23 CN CN202121995755.1U patent/CN216598984U/en active Active
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Effective date of registration: 20230414 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 1001-1005, building 3, Tsinghua Science and Technology Park (Zhuhai) phase II scientific research incubation building, 101 University Road, Tangjiawan Town, high tech Zone, Zhuhai City, Guangdong Province, 519080 Patentee before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. |