CN110518563B - Overvoltage protection method, MCU and air conditioning equipment - Google Patents
Overvoltage protection method, MCU and air conditioning equipment Download PDFInfo
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- CN110518563B CN110518563B CN201910860017.7A CN201910860017A CN110518563B CN 110518563 B CN110518563 B CN 110518563B CN 201910860017 A CN201910860017 A CN 201910860017A CN 110518563 B CN110518563 B CN 110518563B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
The invention provides an overvoltage protection method, an MCU (microprogrammed control unit) and air conditioning equipment, wherein the overvoltage protection method is realized based on electrical equipment, the electrical equipment comprises a pre-charging capacitor, an adjusting circuit, the MCU and a discharging circuit, the pre-charging capacitor is connected with a first end of the adjusting circuit, a second end of the adjusting circuit is connected with the discharging circuit, and the adjusting circuit is controlled by the MCU, and the overvoltage protection method comprises the following steps: after first preset time passes after electrification, the MCU acquires a first voltage value at two ends of the current pre-charging capacitor; judging whether the first voltage value is larger than a first preset voltage value or not; if the first voltage value is larger than the first preset voltage value, the adjusting circuit controls the discharging circuit to release the electric quantity in the pre-charging capacitor. The invention has the beneficial effects that: the method comprises the steps of acquiring the voltage of a pre-charging end by setting a first preset time, judging the voltage, and discharging through a discharging circuit of the air conditioning equipment if the voltage is judged to be in line fault connection, so that the air conditioning equipment is protected after being in line fault connection under the condition that additional equipment is not needed.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an overvoltage protection method, an MCU and an air conditioning device.
Background
When an installer installs an air conditioner, the air conditioner is in wrong connection, and if the air conditioner is connected to a power supply with higher voltage (for example, a 220VAC unidirectional power supply is connected to a 330VAC three-phase power supply), the existing air conditioner does not have the capability of automatically cutting off the power supply, so that the air conditioner is damaged due to overvoltage.
Disclosure of Invention
The invention mainly aims to provide an overvoltage protection method, and aims to solve the technical problem that an air conditioner is damaged due to overvoltage.
The invention provides an overvoltage protection method which is realized based on electrical equipment, wherein the electrical equipment comprises a pre-charging capacitor, an adjusting circuit, an MCU and a discharging circuit, the pre-charging capacitor is connected with a first end of the adjusting circuit, a second end of the adjusting circuit is connected with the discharging circuit, and the adjusting circuit is controlled by the MCU, and the overvoltage protection method comprises the following steps:
after first preset time passes after electrification, the MCU acquires a first voltage value at two ends of the pre-charging capacitor;
judging whether the first voltage value is larger than a first preset voltage value or not;
and if the first voltage value is greater than the first preset voltage value, controlling the discharge circuit to release the electric quantity in the pre-charge capacitor through the adjusting circuit.
Further, the step of controlling the discharge circuit to discharge the electric quantity in the pre-charge capacitor through the adjusting circuit includes:
and controlling the corresponding insulated gate bipolar transistor in the adjusting circuit to be conducted, so that the electric quantity in the pre-charging capacitor is released through the discharging circuit.
Further, the electrical equipment further includes a normal operation circuit, the normal operation circuit is controlled by the MCU, and after the step of determining whether the first voltage value is greater than the first preset voltage value, the method further includes:
and if the first voltage value is not greater than the first preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
Further, after the step of determining whether the first voltage value is greater than a first preset voltage value, the method includes:
if the first voltage value is not greater than a first preset voltage value, acquiring a second voltage value at two ends of the pre-charge capacitor after a second preset time;
judging whether the second voltage value is larger than a second preset voltage value or not;
and if the second voltage value is larger than a second preset voltage value, controlling the discharge circuit to release the electric quantity in the pre-charge capacitor through the adjusting circuit.
Further, the electrical equipment further includes a normal operation circuit, the normal operation circuit is controlled by the MCU, and after the step of determining whether the second voltage value is greater than the second preset voltage value, the method further includes:
and if the second voltage value is not greater than a second preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
Further, after the step of controlling the discharge circuit to discharge the charge in the pre-charge capacitor, the method includes:
acquiring a third voltage value at two ends of the pre-charging capacitor at present after a third preset time;
judging whether the third voltage value is lower than the first preset voltage value or not;
and if the third voltage value is lower than the first preset voltage value, stopping the discharge circuit from releasing the electric quantity in the capacitor.
Further, the electrical equipment further includes a relay, a first end of the relay is connected to the pre-charge capacitor, a second end of the relay is connected to the adjusting circuit, the relay is controlled by the MCU, and after the step of determining whether the first voltage value is greater than a first preset voltage value, the method further includes:
if the first voltage value is not greater than a first preset voltage value, detecting and judging whether the voltage values at the two ends of the pre-charging capacitor are always smaller than the first preset voltage value within a preset time period;
and if so, controlling the relay to suck.
Further, the step of controlling the actuation of the relay includes:
detecting a fourth voltage value at two ends of the pre-charging capacitor at present;
judging whether the fourth voltage value is larger than a third preset voltage value or not;
if yes, controlling the relay to be closed;
wherein the third preset voltage value is not greater than the first preset voltage value.
This application has still replaced red MCU, includes:
the first voltage value acquisition module is used for acquiring a first voltage value at two ends of the pre-charging capacitor at present after a first preset time passes after the pre-charging capacitor is powered on;
the first voltage value judging module is used for judging whether the first voltage value is larger than a first preset voltage value or not;
and the discharge circuit control module controls the discharge circuit to release the electric quantity in the pre-charging capacitor through the adjusting circuit if the first voltage value is greater than the first preset voltage value.
The application also provides air conditioning equipment, which comprises the MCU.
The invention has the beneficial effects that: the method comprises the steps of acquiring the voltage of a pre-charging end by setting a first preset time, judging the voltage, and discharging through a discharging circuit of the air conditioning equipment if the voltage is judged to be in line fault connection, so that the air conditioning equipment is protected after being in line fault connection under the condition that additional equipment is not needed.
Drawings
Fig. 1 is a schematic circuit diagram of an air conditioning apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method of overvoltage protection according to an embodiment of the invention;
fig. 3 is a block diagram of an MCU according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides an overvoltage protection method implemented based on an electrical device, where the electrical device includes a pre-charge capacitor, an adjustment circuit, an MCU, and a discharge circuit, the pre-charge capacitor is connected to a first end of the adjustment circuit, a second end of the adjustment circuit is connected to the discharge circuit, and the adjustment circuit is controlled by the MCU, including:
s1: after first preset time passes after electrification, the MCU acquires a first voltage value at two ends of the pre-charging capacitor;
s2: judging whether the first voltage value is larger than a first preset voltage value or not;
s3: and if the first voltage value is greater than the first preset voltage value, controlling the discharge circuit to release the electric quantity in the pre-charge capacitor through the adjusting circuit.
As described in step S1, the electrical device may include an air conditioner, a refrigerator, a water heater, etc., and as described in detail below, after the air conditioner is powered on, the voltage value across the pre-charge capacitor is obtained after a first preset time. The voltage value obtained at the two ends of the pre-charging capacitor can be obtained through an ammeter, and then the detection result is transmitted to the MCU, or as shown in fig. 1, a first resistor R1 and a second resistor R2 are provided, and the voltage at the two ends of the pre-charging capacitor is multiplied and then transmitted to the MCU. The first preset time is preset and can be set according to the difference between the wrong connection voltage and the normal connection voltage, and the wrong connection voltage is larger than the normal connection voltage, so that the electric quantity in the pre-charging capacitor is larger than the electric quantity in the pre-charging capacitor under the wrong connection voltage within a certain time range, and the electric quantity change of the pre-charging capacitor and the normal connection voltage is not obvious after the power is switched on. Or the time when the pre-charge voltage does not reach the amount of electricity under normal wiring voltage.
As described in the above step S2, the first voltage value is compared with the first preset voltage value to determine the magnitude of the first preset voltage value, where the first preset voltage value is also preset, and the first preset voltage value may be set to be a voltage value that is properly greater than the theoretical value of the normal operating voltage after the first preset time, that is, if a faulty wire is connected, the voltage value will certainly be much greater than the theoretical voltage value, but the set first preset voltage value cannot exceed the theoretical voltage value too much, so as to prevent the voltage value of the faulty wire from being within the range.
As described in step S3, if the first preset time elapses, and the detected first voltage value is greater than the first preset voltage value, it can be determined as a faulty line, and at this time, the switch Q2 and the switch Q6 in the adjusting circuit are controlled to be turned on, so that the pre-charge source can be connected to the discharge circuit through the adjusting circuit, and the electric quantity in the pre-charge source can be released through each discharge unit in the discharge circuit. It should be noted that the resistance of the discharge unit in the discharge circuit should be large to avoid the discharge unit from being damaged under the voltage of the wrong connection line, for example, the discharge unit may be a compressor circuit 200 as shown in fig. 1, where the discharge unit of the compressor circuit 200 is a motor, and the motor may be a Y-connection motor or a delta-connection motor.
In this embodiment, the step S3 includes:
s301: and controlling the corresponding insulated gate bipolar transistor in the adjusting circuit to be conducted, so that the electric quantity in the pre-charging capacitor is released through the discharging circuit.
As described in step S301, referring to fig. 1, the adjustment circuit is an IPM circuit 100, which includes 6 IGBTs (insulated gate bipolar transistors) and a driving device for driving the IGBTs, the driving device is controlled by the MCU, and the 6 IGBTs are respectively connected to the pre-charge capacitor and the compressor circuit 200. If the first voltage value is detected to be greater than or equal to the first preset voltage value, the MCU controls the switch tube Q2 and the switch tube Q6 to be turned on through the driving device (or the switch tube Q2 and the switch tube Q7 may be turned on, the switch tube Q3 and the switch tube Q5 are turned on, the switch tube Q3 and the switch tube Q7 are turned on, the switch tube Q4 and the switch tube Q5 are turned on, and the switch tube Q4 and the switch tube Q7 are turned on, so that the electric quantity of the pre-charge capacitor is released through the compressor circuit 200.
In this embodiment, the air conditioning equipment further includes a normal operation circuit, the normal operation circuit is controlled by the MCU, and after step S2, the method further includes:
s3011: and if the first voltage value is not greater than the first preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
As described in step S3011, when it is detected that the first voltage value is not greater than the first preset value, the voltage of the connection line may be determined to be the normal operating voltage or not greater than the normal operating voltage, because there is generally only higher than the normal voltage or no voltage in the wrong connection line, under the condition of no voltage, the MCU and the like generally supply power through the voltage, which is equivalent to no power supply at this time, and will not be executed, so that the voltage of the normal connection line may be determined at this time (after the first preset value in the region is ensured, even if the air conditioner cannot be normally started, the air conditioner cannot be damaged), and the pre-charge capacitor is connected to the normal operating circuit, so that the air conditioner operates normally.
In this embodiment, the electrical device further includes a normal operating circuit, the normal operating circuit is controlled by the MCU, and after step S2, the method includes:
s311: if the first voltage value is not greater than a first preset voltage value, acquiring a second voltage value at two ends of the pre-charge capacitor after a second preset time;
s312: judging whether the second voltage value is larger than a second preset voltage value or not;
s313: if the second voltage value is larger than a second preset voltage value, controlling the discharging circuit to release the electric quantity in the pre-charging capacitor through the adjusting circuit;
s314: and if the second voltage value is not greater than a second preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
As described in the foregoing steps S311 to S314, when the first voltage value is not greater than the first preset voltage value, it may be considered that there is no wrong wiring during assembling the air conditioner, but the electric quantity in the capacitor is not enough to normally start the air conditioner, so that it is necessary to start the air conditioner circuit after the second preset time, so as to enable the electric quantity of the pre-charge capacitor to reach a certain value.
In this embodiment, after the step S3, the method includes:
s401: acquiring a third voltage value at two ends of the pre-charging capacitor at present after a third preset time;
s402: judging whether the third voltage value is lower than the first preset voltage value or not;
s403: and if the third voltage value is lower than the first preset voltage value, stopping the discharge circuit from releasing the electric quantity in the capacitor.
As described in steps S401 to S403, after the electric quantity in the pre-charge capacitor is released through the discharge circuit, since the installer may know that the wiring is wrong through the discharge circuit, the third voltage value may not be greater than the first preset voltage value (or may be set as an additional voltage value), and then the air conditioner may not discharge through the discharge circuit, but continue to accumulate the electric quantity through the pre-charge capacitor, and then the air conditioner may operate normally. It should be understood that there is a wiring error, but the installer may not find the error, so the error may be detected again after the fourth time of subsequent redesign, or the flow of steps S311 to S314 may be added subsequently, so that the electric quantity in the pre-charge capacitor is released through the discharge circuit when the wiring error occurs, thereby ensuring the safety of the circuit.
In this embodiment, the air conditioning equipment further includes a relay, a first end of the relay is connected to the pre-charge capacitor, a second end of the relay is connected to the adjusting circuit, the relay is controlled by the MCU, and after step S2, the method further includes:
s321: if the first voltage value is not greater than a first preset voltage value, detecting and judging whether the voltage values at the two ends of the pre-charging capacitor are always smaller than the first preset voltage value within a preset time period;
s322: and if so, controlling the relay to suck.
As described in the above steps S321 to S322, generally, the operating voltage of the air conditioner is generally the commercial power, and the line connected with the wrong high voltage is generally connected to two live wires, and the voltage connected to the live wire is often much larger than the commercial power, for example, the commercial power is generally 220V, and the voltage connected to the two live wires is 330V, so the first preset voltage may be set between 220V and 330V, and if the voltage is set to 240V, the normal connection voltage is connected, the voltage at the two ends of the pre-charging capacitor may not exceed 220V, and of course, the set first preset time is too short, and the wrong connection line may not exceed 220V, so when the air conditioner is normally operated, the detection is performed within the preset time period, and if the first preset voltage value is not exceeded all the time, the condition is considered to be met, and the relay is pulled in, so that the air conditioner normally operates.
In this embodiment, the step S322 includes:
s3221: detecting a fourth voltage value at two ends of the pre-charging capacitor at present;
s3222: judging whether the fourth voltage value is larger than a third preset voltage value or not;
s3223: if yes, controlling the relay to be closed;
wherein the third preset voltage value is not greater than the first preset voltage value.
As described in the foregoing steps S3221 to S3223, referring to fig. 1, since the voltage across the pre-charge capacitor needs to reach a certain value to pull in the relay and short-circuit the PTC1, so that the air conditioning equipment normally operates, otherwise, the voltage across the pre-charge capacitor suddenly increases, so that the partial discharge amount of the pre-charge capacitor increases, and the pre-charge capacitor is damaged, even explodes, and other safety problems occur, so that the air conditioning equipment can be safely started only when the fourth voltage value is greater than the third preset voltage value.
The present invention also provides an MCU including:
a first voltage value obtaining module 10, where the first voltage value obtaining module is configured to obtain a first voltage value at two ends of the pre-charge capacitor at present after a first preset time elapses after power is turned on;
a first voltage value determining module 20, configured to determine whether the first voltage value is greater than a first preset voltage value;
and the discharge circuit control module 30 controls the discharge circuit to release the electric quantity in the pre-charge capacitor through the adjusting circuit if the first voltage value is greater than the first preset voltage value.
The electrical device may include an air conditioning device, a refrigerator, a water heater, and the like, and as described in detail below with reference to the air conditioning device, the first voltage value obtaining module 10 is configured to obtain a voltage value across the pre-charge capacitor after a first preset time elapses after the air conditioning device is powered on. The voltage value obtained at the two ends of the pre-charging capacitor can be obtained through an ammeter, and then the detection result is transmitted to the MCU, or as shown in fig. 1, a first resistor R1 and a second resistor R2 are provided, and the voltage at the two ends of the pre-charging capacitor is multiplied and then transmitted to the MCU. The first preset time is preset and can be set according to the difference between the wrong connection voltage and the normal connection voltage, and the wrong connection voltage is larger than the normal connection voltage, so that the electric quantity in the pre-charging capacitor is larger than the electric quantity in the pre-charging capacitor under the wrong connection voltage within a certain time range, and the electric quantity change of the pre-charging capacitor and the normal connection voltage is not obvious after the power is switched on. Or the time when the pre-charge voltage does not reach the amount of electricity under normal wiring voltage.
The first voltage value determining module 20 is configured to compare a first voltage value with a first preset voltage value, and determine the first preset voltage value, where the first preset voltage value is also preset, and the first preset voltage value may be set to be a voltage value that is properly greater than a voltage value that can theoretically be reached by a normal operating voltage after a first preset time, that is, if a faulty wire is connected, the first preset voltage value is certainly much greater than the theoretical voltage value, but the set first preset voltage value cannot exceed the theoretical voltage value too much, so as to prevent the voltage value of the faulty wire from being within the range.
The discharging circuit control module 30 is configured to determine that the line is faulty if the detected first voltage value is greater than the first preset voltage value after the first preset time, and at this time, the pre-charging source may be connected to the discharging circuit through the adjusting circuit by controlling the conduction of the switching tube Q2 and the switching tube Q6 in the adjusting circuit, so that the electric quantity in the pre-charging source may be released through each discharging unit in the discharging circuit. It should be noted that the resistance of the discharge unit in the discharge circuit should be large to avoid the discharge unit from being damaged under the voltage of the wrong connection line, for example, the discharge unit may be a compressor circuit 200 as shown in fig. 1, where the discharge unit of the compressor circuit 200 is a motor, and the motor may be a Y-connection motor or a delta-connection motor.
In this embodiment, the discharge circuit control module 30 includes:
and the adjusting circuit control module 302 is configured to control a corresponding insulated gate bipolar transistor in the adjusting circuit to be turned on, so that the electric quantity in the pre-charging capacitor is released through the discharging circuit.
Referring to fig. 1, the adjustment circuit is an IPM circuit 100, which includes 6 IGBTs (insulated gate bipolar transistors) and a driving device for driving the IGBTs, the driving device is controlled by the MCU, and the 6 IGBTs are respectively connected to the precharge capacitor and the compressor circuit 200. If the first voltage value is detected to be greater than or equal to the first preset voltage value, the MCU controls the switch tube Q2 and the switch tube Q6 to be turned on through the driving device (or the switch tube Q2 and the switch tube Q7 may be turned on, the switch tube Q3 and the switch tube Q5 are turned on, the switch tube Q3 and the switch tube Q7 are turned on, the switch tube Q4 and the switch tube Q5 are turned on, and the switch tube Q4 and the switch tube Q7 are turned on, so that the electric quantity of the pre-charge capacitor is released through the compressor circuit 200.
In this embodiment, the air conditioning equipment further includes a normal operating circuit, the normal operating circuit is controlled by the MCU, and the MCU further includes:
the normal operating circuit communicating module 3011, if the first voltage value is not greater than the first preset voltage value, communicates the pre-charge capacitor with the normal operating circuit.
When detecting that first voltage value is not more than first default, then can deem that the voltage of wiring is normal operating voltage or is not more than this normal operating voltage, because connect wrong line and generally only exist and be higher than normal voltage or do not have voltage, under the condition of no voltage, MCU etc. generally all supply power through this voltage, be equivalent to not having the power this moment, just can not carry out yet, so just can deem to be the voltage of normal wiring this moment (after guaranteeing the first default in region, even can not normally start, air conditioning equipment can not take place the damage yet), connect precharge electric capacity and normal operating circuit, make air conditioning equipment normally work.
In this embodiment, the electrical equipment further includes a normal operating circuit, the normal operating circuit is controlled by the MCU, and the MCU further includes:
a second voltage value obtaining module 311, configured to obtain a second voltage value at two ends of the pre-charge capacitor after a second preset time if the first voltage value is not greater than a first preset voltage value;
a second voltage value determining module 312, configured to determine whether the second voltage value is greater than a second preset voltage value;
the releasing module is used for controlling the discharging circuit to release the electric quantity in the pre-charging capacitor through the adjusting circuit if the second voltage value is larger than a second preset voltage value;
the normal operation circuit is connected to the sub-module 314, and if the second voltage value is not greater than a second preset voltage value, the pre-charge capacitor is connected to the normal operation circuit.
As described in the foregoing steps S311 to S314, when the first voltage value is not greater than the first preset voltage value, it may be considered that there is no wrong wiring during assembling the air conditioner, but the electric quantity in the capacitor is not enough to normally start the air conditioner, so that it is necessary to start the air conditioner circuit after the second preset time, so as to enable the electric quantity of the pre-charge capacitor to reach a certain value.
In this embodiment, the MCU further includes:
a third voltage value obtaining module 401, configured to obtain, after a third preset time, a third voltage value at two ends of the pre-charge capacitor at present;
a third voltage value determining module 402, configured to determine whether the third voltage value is lower than the first preset voltage value;
the stopping module 403 stops the discharging circuit from releasing the electric quantity in the capacitor if the third voltage value is lower than the first preset voltage value.
After the electric quantity in the pre-charging capacitor is released through the discharging circuit, because the installation master knows that the wiring has been wrong through the discharging circuit at this moment, the third voltage value can be set to be not more than the first preset voltage value (a voltage value can also be set in addition), then the discharging circuit is not used for discharging, the electric quantity is continuously accumulated through the pre-charging capacitor, and the air conditioning equipment works normally again. It should be understood that there is a wiring error, but the installer may not find the error, so the error may be detected again after the fourth time of subsequent redesign, or the flow of steps S311 to S314 may be added subsequently, so that the electric quantity in the pre-charge capacitor is released through the discharge circuit when the wiring error occurs, thereby ensuring the safety of the circuit.
In this embodiment, the air conditioning equipment further includes a relay, a first end of the relay is connected to the pre-charge capacitor, a second end of the relay is connected to the adjusting circuit, the relay is controlled by the MCU, and the MCU further includes:
a voltage value detection module 321, configured to detect and determine whether the voltage values at two ends of the pre-charge capacitor are always smaller than a first preset voltage value within a preset time period if the first voltage value is not greater than the first preset voltage value;
and the relay pull-in module 322 controls the relay to pull in if the relay pull-in module is used.
Generally speaking, the working voltage of the air conditioning equipment is generally the commercial power, and the line connected with the wrong high voltage is generally connected to two live wires, and the voltage connected to the live wire is often far greater than the commercial power, for example, the commercial power is generally 220V, and the voltage connected to the two live wires is 330V, so the first preset voltage can be set between 220V and 330V, assuming that the voltage is set to 240V, the voltage connected to the two ends of the pre-charging capacitor is normal, the voltage at the two ends of the pre-charging capacitor does not exceed 220V, of course, the set first preset time is too short, the wrong connection of the line may not exceed 220V, so when the air conditioning equipment is normally working, the detection is performed within the set preset time period, if the first preset voltage value is not exceeded all the time, the condition is considered to be met, and the relay is pulled in, so that the air conditioning equipment is normally working.
In this embodiment, the relay pull-in module 322 further includes:
a fourth voltage value detecting module 3221, configured to detect a fourth voltage value at two ends of the pre-charge capacitor currently;
the fourth voltage value determining module 3222 is configured to determine whether the fourth voltage value is greater than a third preset voltage value;
the relay attracting submodule 3223 controls the relay to attract if the relay attracting submodule is in the positive state,
wherein the third preset voltage value is not greater than the first preset voltage value.
Referring to fig. 1, since the voltage across the pre-charge capacitor needs to reach a certain value to pull in the relay and short the PTC1, the air conditioning device can normally operate, otherwise, the voltage across the pre-charge capacitor will suddenly increase, which increases the local discharge capacity of the pre-charge capacitor, resulting in the pre-charge capacitor being damaged or even exploding, and so on, so that the air conditioning device can be safely started only when the fourth voltage value is greater than the third preset voltage value.
The invention also provides air conditioning equipment comprising the MCU and a method for realizing the overvoltage protection.
The invention has the beneficial effects that: the method comprises the steps of acquiring the voltage of a pre-charging end by setting a first preset time, judging the voltage, and discharging through a discharging circuit of the air conditioning equipment if the voltage is judged to be in line fault connection, so that the air conditioning equipment is protected after being in line fault connection under the condition that additional equipment is not needed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. The overvoltage protection method is realized based on electrical equipment, the electrical equipment comprises a pre-charging capacitor, an adjusting circuit, an MCU and a discharging circuit, the pre-charging capacitor is connected with a first end of the adjusting circuit, a second end of the adjusting circuit is connected with the discharging circuit, and the adjusting circuit is controlled by the MCU, and the overvoltage protection method is characterized by comprising the following steps:
after first preset time passes after electrification, the MCU acquires a first voltage value at two ends of the pre-charging capacitor;
judging whether the first voltage value is larger than a first preset voltage value or not;
if the first voltage value is larger than the first preset voltage value, controlling the discharging circuit to release the electric quantity in the pre-charging capacitor through the adjusting circuit;
after the step of judging whether the first voltage value is greater than a first preset voltage value, the method includes:
if the first voltage value is not greater than a first preset voltage value, acquiring a second voltage value at two ends of the pre-charge capacitor after a second preset time;
judging whether the second voltage value is larger than a second preset voltage value or not;
and if the second voltage value is larger than a second preset voltage value, controlling the discharge circuit to release the electric quantity in the pre-charge capacitor through the adjusting circuit.
2. The method of claim 1, wherein the step of controlling the discharge circuit to discharge the charge in the pre-charge capacitor via the adjustment circuit comprises:
and controlling the corresponding insulated gate bipolar transistor in the adjusting circuit to be conducted, so that the electric quantity in the pre-charging capacitor is released through the discharging circuit.
3. The method of claim 1, wherein the electrical device further comprises a normal operation circuit controlled by the MCU, and wherein the step of determining whether the first voltage value is greater than a first predetermined voltage value further comprises:
and if the first voltage value is not greater than the first preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
4. The method of claim 1, wherein the electrical device further comprises a normal operation circuit controlled by the MCU, and wherein the step of determining whether the second voltage value is greater than a second predetermined voltage value further comprises:
and if the second voltage value is not greater than a second preset voltage value, communicating the pre-charge capacitor with a normal working circuit.
5. The method of claim 1, wherein the step of controlling the discharge circuit to discharge the charge in the pre-charge capacitor is followed by:
acquiring a third voltage value at two ends of the pre-charging capacitor at present after a third preset time;
judging whether the third voltage value is lower than the first preset voltage value or not;
and if the third voltage value is lower than the first preset voltage value, stopping the discharge circuit from releasing the electric quantity in the capacitor.
6. The method of claim 1, wherein the electrical device further comprises a relay, a first terminal of the relay is connected to the pre-charge capacitor, a second terminal of the relay is connected to the regulation circuit, and the relay is controlled by the MCU, wherein the step of determining whether the first voltage value is greater than a first predetermined voltage value further comprises:
if the first voltage value is not greater than a first preset voltage value, detecting and judging whether the voltage values at the two ends of the pre-charging capacitor are always smaller than the first preset voltage value within a preset time period;
and if so, controlling the relay to suck.
7. The method of claim 6, wherein the step of controlling the actuation of the relay comprises:
detecting a fourth voltage value at two ends of the pre-charging capacitor at present;
judging whether the fourth voltage value is larger than a third preset voltage value or not;
if yes, controlling the relay to be closed;
wherein the third preset voltage value is not greater than the first preset voltage value.
8. An MCU, comprising:
the first voltage value acquisition module is used for acquiring a first voltage value at two ends of a current pre-charging capacitor after a first preset time passes after the power is switched on;
the first voltage value judging module is used for judging whether the first voltage value is larger than a first preset voltage value or not;
the discharging circuit control module controls the discharging circuit to release the electric quantity in the pre-charging capacitor through an adjusting circuit if the first voltage value is larger than the first preset voltage value;
a second voltage value obtaining module, configured to obtain a second voltage value at two ends of the pre-charge capacitor after a second preset time if the first voltage value is not greater than a first preset voltage value;
the second voltage value judging module is used for judging whether the second voltage value is larger than a second preset voltage value or not;
and the releasing module is used for controlling the discharging circuit to release the electric quantity in the pre-charging capacitor through the adjusting circuit if the second voltage value is larger than a second preset voltage value.
9. An air conditioning apparatus characterized by comprising the MCU of claim 8.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN104617782A (en) * | 2014-12-25 | 2015-05-13 | 广东美的制冷设备有限公司 | Surge current resisting device, surge current resisting method and household appliance |
| CN104638616A (en) * | 2014-12-29 | 2015-05-20 | 广东美的制冷设备有限公司 | Variable-frequency air conditioner and voltage-surge-proof protection method and device for variable-frequency air conditioner |
| CN206962695U (en) * | 2017-07-31 | 2018-02-02 | 北京新能源汽车股份有限公司 | For electric automobile active discharge circuit and there is its electric automobile |
| CN108574272A (en) * | 2017-03-08 | 2018-09-25 | 中惠创智无线供电技术有限公司 | A kind of protection circuit and wireless power supply system applied to wireless power supply system |
| CN208299427U (en) * | 2018-06-13 | 2018-12-28 | 深圳市易优电气有限公司 | Overvoltage crowbar and over-pressure safety device |
| CN110071624A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102660B (en) * | 2009-12-22 | 2014-08-27 | 乐金电子(天津)电器有限公司 | Power control method for outdoor unit of variable frequency air conditioner |
| US8928388B2 (en) * | 2013-03-15 | 2015-01-06 | Peregrine Semiconductor Corporation | Self-activating adjustable power limiter |
| CN108933433A (en) * | 2017-05-25 | 2018-12-04 | 中兴通讯股份有限公司 | The high voltage protection device of circuit system |
| DE102018202661A1 (en) * | 2018-02-22 | 2019-08-22 | Zf Friedrichshafen Ag | Method and device for discharging a DC link capacitor |
-
2019
- 2019-09-11 CN CN201910860017.7A patent/CN110518563B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709871A (en) * | 2012-06-25 | 2012-10-03 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN104617782A (en) * | 2014-12-25 | 2015-05-13 | 广东美的制冷设备有限公司 | Surge current resisting device, surge current resisting method and household appliance |
| CN104638616A (en) * | 2014-12-29 | 2015-05-20 | 广东美的制冷设备有限公司 | Variable-frequency air conditioner and voltage-surge-proof protection method and device for variable-frequency air conditioner |
| CN108574272A (en) * | 2017-03-08 | 2018-09-25 | 中惠创智无线供电技术有限公司 | A kind of protection circuit and wireless power supply system applied to wireless power supply system |
| CN206962695U (en) * | 2017-07-31 | 2018-02-02 | 北京新能源汽车股份有限公司 | For electric automobile active discharge circuit and there is its electric automobile |
| CN208299427U (en) * | 2018-06-13 | 2018-12-28 | 深圳市易优电气有限公司 | Overvoltage crowbar and over-pressure safety device |
| CN110071624A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
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| Publication number | Publication date |
|---|---|
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Address after: No. 1 by villagers' group of helongsha, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Kaili HVAC Co.,Ltd. Address before: No. 1 by villagers' group of helongsha, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee before: GUANGDONG CHIGO HEATING AND VENTILATION EQUIPMENT Co.,Ltd. |