CN104134983B - Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner - Google Patents
Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner Download PDFInfo
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- CN104134983B CN104134983B CN201410314284.1A CN201410314284A CN104134983B CN 104134983 B CN104134983 B CN 104134983B CN 201410314284 A CN201410314284 A CN 201410314284A CN 104134983 B CN104134983 B CN 104134983B
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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
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Abstract
The invention discloses a kind of overvoltage protection for air-conditioner, it includes：Protection device, protection device is connected between one end of the alternating current of input and the first input end of rectifier；Gate-controlled switch, gate-controlled switch is in parallel with protection device；The voltage sample device of the DC voltage of sampling rectifier output；Electrochemical capacitor；Control circuit; control circuit control gate-controlled switch in the upper limit of the DC voltage more than preset security voltage range is disconnected so that protection device is connected in series between one end of alternating current and the first input end of rectifier; and in lower limit of the DC voltage less than preset security voltage range; by controlling IPM modules to adjust the running frequency of compressor, so that DC voltage is in preset security voltage range.The overvoltage protection can carry out overvoltage protection in the overtension of the alternating current of input, it is to avoid the electronic component in air-conditioner is damaged because of overvoltage.The invention also discloses a kind of air-conditioner and a kind of over-voltage protection method of air-conditioner.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of overvoltage protection and one kind for air-conditioner
Air-conditioner and a kind of over-voltage protection method of air-conditioner with the overvoltage protection.
Background technology
At present, when transducer air conditioning is powered by electric main, electric main is converted into directly by current rectifying and wave filtering circuit
IPM modules are supplied after stream electricity.
However, because AC network has voltage pulsation, the voltage of the electric main for being input to rectification circuit can be caused to become
Height, so that the galvanic voltage of rectification circuit output also can be uprised accordingly, due to devices such as high-voltage filtering capacitor, IPM modules
Its pressure-resistant safety value for bearing is certain, will be drawn when the operating voltage of these devices is more than the pressure voltage that its highest is born
The service behaviour reduction for playing these devices is even damaged.The parameter of such as high-voltage filtering capacitor is 400UF/400V, in alternating current
When netting unstable, after such as there is voltage that big risings cause to load on this electric capacity more than 400V in the voltage of electric main
A period of time can cause its capacitance to decline even puncture short and damage.
The content of the invention
The purpose of the present invention is intended at least solve above-mentioned technological deficiency.
Therefore, first purpose of the invention is to propose a kind of overvoltage protection for air-conditioner, Neng Gou
Overvoltage protection is carried out during the overtension of the alternating current of input, it is to avoid the electronic component in air-conditioner is damaged because of overvoltage.
Second object of the present invention is to propose a kind of air-conditioner.Third object of the present invention is to propose a kind of sky
Adjust the over-voltage protection method of device.
To reach above-mentioned purpose, a kind of overvoltage protection dress for air-conditioner that one aspect of the present invention embodiment is proposed
Put, including：Protection device, the protection device is connected on the rectifier in one end of the alternating current of input and the air-conditioner
Between first input end；Gate-controlled switch, the gate-controlled switch is in parallel with the protection device；It is straight that the rectifier of sampling is exported
Flow the voltage sample device of voltage, the voltage sample device be connected to the first output end of the rectifier and the second output end it
Between；Electrochemical capacitor, the electrochemical capacitor is connected in parallel between the first output end of the rectifier and the second output end；And control
Circuit, the control circuit is connected with the control end and the voltage sample device of the gate-controlled switch respectively, the control circuit
Controlled in the upper limit of the DC voltage that the voltage sample device is sampled more than preset security voltage range described controllable
Switch off so that the protection device is connected in series between the first input end of one end of the alternating current and the rectifier, and
In lower limit of the DC voltage that the voltage sample device is sampled less than the preset security voltage range, the control
Circuit by controlling the IPM modules in the air-conditioner to adjust the running frequency of the compressor in the air-conditioner so that institute
State DC voltage and be in the preset security voltage range.
The overvoltage protection for air-conditioner for proposing according to embodiments of the present invention, samples whole in voltage sample device
When the DC voltage of stream device output is more than the upper limit of preset security voltage range, control circuit control gate-controlled switch disconnects, so
The current supply circuit of protection device incoming transport electricity, so that the too high voltage protected device of the alternating current of input undertakes, keeps away
The damage of electronic component in exempting to cause air-conditioner because of the overtension of the alternating current being input into.Also, in the sampling of voltage sample device
The DC voltage for arriving less than preset security voltage range lower limit when, control circuit by control the IPM modules in air-conditioner with
The running frequency of the compressor in regulation air-conditioner, so that DC voltage is in preset security voltage range.Therefore, the present invention is real
Applying the overvoltage protection for air-conditioner of example can improve the reliability of frequency conversion control circuit of whole air-conditioner, it is ensured that
Air-conditioner is normal, safe and stable, reliability service.
According to one embodiment of present invention, the protection device can be positive temperature coefficient PTC thermistor or cement
Resistance.
Wherein, the gate-controlled switch can be relay.
According to one embodiment of present invention, the control circuit includes：Controller, the controller is adopted with the voltage
Sample device is connected；3rd resistor, one end of the 3rd resistor is connected with the controller；First triode, the one or three pole
The base stage of pipe is connected with the other end of the 3rd resistor, the coil in the colelctor electrode of first triode and the relay
One end be connected, the other end of the coil in the relay is connected with the power supply of the first predeterminated voltage, in the relay
One end of switch and the other end are connected in parallel on the two ends of the protection device；4th resistance, one end of the 4th resistance with it is described
The emitter stage of the first triode is connected, the other end ground connection of the 4th resistance；First diode, the sun of first diode
Pole is connected with the colelctor electrode of first triode, the power supply phase of the negative electrode of first diode and first predeterminated voltage
Even.
Also, the described overvoltage protection for air-conditioner, also includes：Power supply circuit, the power supply circuit is simultaneously
It is associated between the first output end of the rectifier and the second output end, the power supply circuit is described for the relay is provided
The power supply of one predeterminated voltage, and the power supply of the second predeterminated voltage is provided for the controller, wherein, second predeterminated voltage is small
In first predeterminated voltage.
According to one embodiment of present invention, when the running frequency of the compressor is less than or equal to the first predeterminated frequency, such as
The DC voltage that really described voltage sample device is sampled is less than the lower limit of the preset security voltage range, the control electricity
Road controls the gate-controlled switch closure so that the protection device is short-circuit.
Additionally, embodiments of the invention also proposed a kind of air-conditioner, it includes the above-mentioned overvoltage for air-conditioner
Protection device.
Air-conditioner according to embodiments of the present invention, in the overtension of the alternating current of input, is filled by overvoltage protection
Put so that the too high voltage protected device of the alternating current being input into undertakes, it is to avoid cause because of the overtension of the alternating current being input into
The damage of electronic component in air-conditioner, reliability is greatly improved, and being capable of the operation of normal table ground.
To reach above-mentioned purpose, another aspect of the present invention embodiment also proposed a kind of overvoltage protection side of air-conditioner
Method, wherein, the air-conditioner includes the above-mentioned overvoltage protection for air-conditioner, the over-voltage protection method of the air-conditioner
Comprise the following steps：The DC voltage that the rectifier of sampling is exported；It is more than preset security voltage range in the DC voltage
The upper limit when control the gate-controlled switch to disconnect so that the protection device is connected in series to one end of the alternating current and the rectification
Between the first input end of device, and in lower limit of the DC voltage less than the preset security voltage range, by control
IPM modules in the air-conditioner to adjust the running frequency of the compressor in the air-conditioner so that at the DC voltage
In the preset security voltage range.
The over-voltage protection method of air-conditioner according to embodiments of the present invention, the DC voltage of real-time sampling rectifier output
Size, the DC voltage for sampling more than preset security voltage range the upper limit when, control gate-controlled switch disconnect, so guarantor
The current supply circuit of shield device incoming transport electricity, so that the too high voltage protected device of the alternating current of input undertakes, it is to avoid
The damage of electronic component in causing air-conditioner because of the overtension of the alternating current being input into, and in DC voltage less than default peace
During the lower limit in full voltage interval, by controlling the IPM modules in air-conditioner to adjust the running frequency of the compressor in air-conditioner,
So that DC voltage is in preset security voltage range, the reliability of circuit is substantially increased, it is ensured that air-conditioner normal table is transported
OK.
According to one embodiment of present invention, when the running frequency of the compressor is less than or equal to the first predeterminated frequency, such as
Really described DC voltage controls the gate-controlled switch closure so that the protection less than the lower limit of the preset security voltage range
Shorted devices.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 is the circuit diagram of the overvoltage protection for air-conditioner according to the embodiment of the present invention；And
Fig. 2 is to be illustrated according to the circuit of one overvoltage protection for air-conditioner of specific embodiment of the present invention
Figure；
Fig. 3 is to be illustrated according to the circuit of the overvoltage protection for air-conditioner of another specific embodiment of the invention
Figure；
Fig. 4 is the resistance-temperature characteristics schematic diagram of the PTC thermistor according to one embodiment of the invention；And
Fig. 5 is the flow chart of the over-voltage protection method of the air-conditioner according to the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used for realizing different structure of the invention.For letter
Change disclosure of the invention, hereinafter the part and setting to specific examples are described.Certainly, they are only merely illustrative, and
Purpose does not lie in the limitation present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is again the relation between itself not indicating discussed various embodiments and/or setting for purposes of simplicity and clarity.This
Outward, the invention provides various specific technique and material example, but those of ordinary skill in the art can be appreciated that
The use of the applicable property and/or other materials of other techniques.In addition, fisrt feature described below second feature it
" on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other feature shape
Into the embodiment between the first and second features, such first and second feature may not be directly contact.
In the description of the invention, it is necessary to explanation, unless otherwise prescribed and limit, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection, or two connections of element internal, can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
With reference to the accompanying drawings come the overvoltage protection for air-conditioner of proposition according to embodiments of the present invention is described with
And the over-voltage protection method of the air-conditioner with the overvoltage protection and the air-conditioner.
Fig. 1 is the circuit diagram of the overvoltage protection for air-conditioner according to the embodiment of the present invention.Such as Fig. 1 institutes
Show, the overvoltage protection for being used for air-conditioner includes：Protection device R0, gate-controlled switch 10, voltage sample device 20, electrolysis electricity
Hold EC1 and control circuit 30.
Wherein, protection device R0 is connected on the first input end of the rectifier in one end of the alternating current of input and air-conditioner
Between IN1, such as, as shown in figure 1, one end of protection device R0 is connected with one end of the alternating current of input, protection device R0's is another
One end is connected with the first input end IN1 of the rectifier 40 in air-conditioner, the second input IN2 and the alternating current of rectifier 40
The other end is connected.Gate-controlled switch 10 is connected in parallel with protection device R0, and it is first defeated that voltage sample device 20 is connected to rectifier 40
Go out to hold between OUT1 and the second output end OUT2, voltage sample device 20 is used to sample rectifier 40 by its first output end OUT1
The DC voltage exported with the second output end OUT2.Electrochemical capacitor EC1 is connected in parallel on the first output end OUT1 and second of rectifier
Between output end OUT2, electrochemical capacitor EC1 plays filter action, and buffering work is played when the DC voltage for sampling falls
With.
As shown in figure 1, control circuit 30 is connected with the control end and voltage sample device 20 of gate-controlled switch 10 respectively, control electricity
Road 30 controls gate-controlled switch 10 in the upper limit of the DC voltage that voltage sample device 20 is sampled more than preset security voltage range
Disconnect, so that protection device R0 series connection is linked between one end of alternating current and the first input end IN1 of rectifier 40, and
In lower limit of the DC voltage that voltage sample device 20 is sampled less than the preset security voltage range, circuit 30 is controlled
By controlling the IPM modules 50 in the air-conditioner to adjust the running frequency of the compressor M in the air-conditioner, so that described
DC voltage is in the preset security voltage range.
, wherein it is desired to explanation, because the voltage of the alternating current being input into occurs fluctuation, and in the voltage of alternating current
It become greater to during more than certain value, the DC voltage of the output of rectifier 40 also can therewith become big.Therefore, it can by voltage sample device 20
To detect the size of the DC voltage of the output of rectifier 40, control circuit 30 can be calculated by judging the size of DC voltage
Go out the height of the voltage of the alternating current of input.DC voltage is sampled more than preset security voltage range in voltage sample device 20
Gate-controlled switch 10 is controlled to disconnect during higher limit, so that protection device R0 seals in the current supply circuit of alternating current to undertake input
The voltage that alternating current is higher by, so as to avoid the electronic component in circuit from being damaged because of overvoltage.
In an embodiment of the present invention, protection device R0 can be PTC (Positive Temperature
Coefficient, positive temperature coefficient) thermistor or cement resistor.Certainly, protection device R0 here can also be other points
Piezoresistance such as ceramic resistor etc., can play a part of partial pressure.
Also, according to one embodiment of present invention, as shown in Figure 2 or Figure 3, voltage sample device 20 can include：Series connection
First resistor R1 and second resistance R2, one end of first resistor R1 is connected with the first output end OUT1 of rectifier 40, first
The other end of resistance R1 is connected with one end of second resistance R2, the other end of second resistance R2 and the second output end of rectifier 40
OUT2 be connected, between the other end of first resistor R1 and one end of second resistance R2 have first node J1, first node J1 with
Control circuit 30 is connected.
Wherein, as shown in Figure 2 or Figure 3, gate-controlled switch 10 can be relay.Also, control circuit 30 may include：Control
Device 301,3rd resistor R3, the first triode Q1, the 4th resistance R4 and the first diode D1.
As shown in Figure 2 or Figure 3, the P1 ends of such as MCU of controller 301 be connected with voltage sample device for example with voltage sample device
In first node J1 be connected, one end of 3rd resistor R3 is connected with the P2 ends of such as MCU of controller 301, the first triode Q1
Base stage be connected with the other end of 3rd resistor R3, one end of the coil in the colelctor electrode of the first triode Q1 and the relay
1 is connected, and the other end 2 of the coil in the relay is connected with the power supply of the first predeterminated voltage such as 12V, opening in relay
One end 3 of pass and the other end 4 are connected in parallel on the two ends of protection device R0 such as PTC thermistor or cement resistor, the 4th resistance R4
One end be connected with the emitter stage of the first triode Q1, the other end of the 4th resistance R4 ground connection, the anode of the first diode D1 with
The colelctor electrode of the first triode Q1 is connected, and the negative electrode of the first diode D1 is connected with the power supply of the first predeterminated voltage such as 12V.
Specifically, in an embodiment of the present invention, as shown in Figure 2 or Figure 3, the above-mentioned overvoltage protection for air-conditioner
Device also includes such as Switching Power Supply of power supply circuit 60, and power supply circuit 60 is connected in parallel on first output end and second of the rectifier
Between output end, that is, one end of first resistor R1 and the other end of second resistance R2 are connected in parallel on, power supply circuit 60 is carried for relay
For the power supply of the first predeterminated voltage such as 12V, and the power supply of the second predeterminated voltage such as 5V is provided for such as MCU of controller 301,
Wherein, second predeterminated voltage is less than first predeterminated voltage.
Also, as shown in Figure 2 or Figure 3, between the first output end OUT1 of rectifier 40 and one end of first resistor R1
Also it is in series with reactor L1.Additionally, as shown in Figure 2 or Figure 3, being additionally provided with EMC filter circuit 70 in the input of alternating current and melting
Disconnected device FUSE1.
According to one embodiment of present invention, as shown in Fig. 2 protection device be PTC thermistor, also, Fig. 2 in only show
Go out the circuit part related to compressor M drivings, other loads such as indoor fan, outdoor fan, four-way valve, step to air-conditioner
The drive circuit of stepper motor even load is not shown, and this partial circuit is existing known technology, be will not be described in detail herein.
In the present embodiment, as shown in Figure 2, it is believed that the DC voltage in loop on electrochemical capacitor EC1 is voltage sample
The DC voltage that device is sampled is V, and the DC current in loop is I.When machine work is established on air-conditioner by cable, in control circuit
MCU exports a high level signal to the first triode Q1, the first triode Q1 conducting by P2 ends, so that relay adhesive, PTC
Thermistor can not be shorted metering function.MCU detects that the DC voltage that rectifier 40 is exported is in by voltage sample device 20
When normally for instance in preset security voltage range, control relay is attracting state always.Such as normal alternating voltage is
220V, according to the operation principle of rectifier 40, now MCU detects the direct current that rectifier 40 is exported by voltage sample device 20
Press and beThis DC voltage works electric in the highest of direct current rear class device such as electrochemical capacitor EC1, IPM modules 50
In pressure, now MCU control relays keep attracting state, and IPM modules 50 drive compressor M to be run by normal running frequency,
The whole frequency conversion control circuit of air-conditioner is working properly.
When the voltage of the alternating current of input is raised, the voltage of such as AC network increases 20% and is 264V, now MCU
By voltage sample device 20 detect rectifier 40 export DC voltage beThis DC voltage close to or
The highest work compression resistance value of electrochemical capacitor EC1 is exceeded, such as parameter of electrochemical capacitor EC1 is 200UF/375V, this direct current
Very close to its pressure voltage, if circuit works on, electrochemical capacitor EC1 can cause electric capacity to pressure because operating voltage is too high
Hydraulic performance decline, if long-term work has the danger of punch through damage.In order to protect electrochemical capacitor EC1, now MCU control relays
Disconnect, PTC thermistor series connection is accessed, and carries out partial pressure.Therefore, DC voltage is sampled more than default peace in voltage sample device 20
MCU control relays during the upper limit in full voltage interval in control circuit are disconnected, so that PTC thermistor is sealed in and powered back
Road undertakes the voltage that the alternating current of input is higher by, so as to avoiding such as electrochemical capacitor EC1 of the electronic component in circuit because excessively electric
Press work and be damaged.In an example of the invention, the upper limit of preset security voltage range can be electrochemical capacitor EC1
The 90% of highest pressure voltage.
Wherein, it is specific as shown in figure 4, being powered back when PTC thermistor is accessed due to the working characteristics of PTC thermistor
Lu Shi, its resistance value is at normal temperatures less than 100 ohm, if now compressor M is operated in an of a relatively high frequency, its work
Making electric current I can be higher.Such as one compressor operating of the air-conditioner of 1P in 40HZ frequencies its operating current more than 2A, in
Be PTC thermistor by electric current about 2A, big operating current causes that the temperature of PTC thermistor is raised rapidly, its resistance
Value also changes therewith, but its resistance is varied with temperature slowly before Curie point is reached, as shown in figure 4, the PTC at 80 DEG C
The resistance of thermistor is 45 ohm, and still within 100 ohm, the partial pressure in this period in PTC thermistor is due to resistance
The change in resistance voltage that less it undertakes is not high, and the resistance of such as PTC thermistor can calculate its electricity for undertaking when being 45 ohm
Pressure is about 90V, and the DC voltage of the at this moment output of rectifier 40 can be dropped in the range of safe voltage.
But after the temperature of PTC thermistor reaches as shown in Figure 4 125 DEG C of Curie point (125 ± 5 DEG C), PTC
The resistance of thermistor can be risen to temperature, and its resistance is raised rapidly.PTC thermistor is from start-up operation under normal circumstances
Several seconds (no more than 10 seconds) is generally to the time for reaching Curie point, if operating current I is bigger, Curie point is reached
Time it is shorter.For example when operating current is 2A, the time for reaching Curie point is general within 3 seconds.Work as PTC thermistor
Temperature reach Curie point after, because its resistance increases rapidly, the voltage that it undertakes also is raised rapidly, makes rectifier 40
The DC voltage of output declines rapidly, if at this moment MCU still controls IPM modules 50 to drive compressor M to remain on frequency not
Become, the operating voltage reduction for causing compressor M and IPM module 50 will rapidly be reduced due to the DC voltage of the output of rectifier 40
Below the operating voltage allowed to it, so as to cause compressor M and the IPM module 50 cannot normal work.
Therefore, MCU is disconnected so that PTC thermistor is connected after access current supply circuit, if MCU passes through in control relay
Voltage sample device 20 detects DC voltage V reductions, and the DC voltage that specially voltage sample device 20 is sampled is less than default peace
The interval lower limit of full voltage, then MCU is by controlling IPM modules 50 so that the running frequency of compressor M is reduced rapidly, or even is compressed
The running frequency of machine is reduced to as zero is stopped, to cause operating current I reductions, so that in PTC thermistor
Partial pressure reduction, the DC voltage of the output of such rectifier 40 will be raised, to prevent the partial pressure in PTC thermistor due to reaching
It is excessive and cause IPM modules, MCU, compressor etc. cannot normal work after Curie point.Also, MCU can also be closed simultaneously
The operating currents such as example indoor and outdoor blower fan of other workloads of air-conditioner than larger load, to cause whole circuit
Operating current I can be reduced so that the electric current for flowing through PTC thermistor will not be too high and causes its resistance to uprise, so that
The partial pressure for obtaining PTC thermistor will not be too high., wherein it is desired to explanation, after reaching Curie-point temperature due to PTC thermistor
Cause the reduction of DC voltage, now electrochemical capacitor EC1 is discharged so that the reduction of DC voltage is curved decline,
Will not rapidly fall in very short time, now MCU is detecting DC voltage less than preset security electricity by voltage sample device
During lower limit between nip, IPM modules in rapid control air-conditioner are reducing the running frequency of the compressor in air-conditioner, work
Electric current I reductions so that the partial pressure in PTC thermistor reduces so that DC voltage can drop to load and device as compressed
Risen before the operating voltage that machine and IPM modules are allowed, until in preset security voltage range.
If it should be noted that during the period, the voltage of the alternating current of input is further raised so that rectifier
, again more than the upper limit of preset security voltage range, now MCU can be by controlling IPM modules 50 so that pressure for the DC voltage of 40 outputs
The running frequency of contracting machine is raised so that operating current I is raised, and then is flowed through the electric current of PTC thermistor and followed risings, and PTC is warm
The temperature of quick resistance is raised, and its resistance can become big due to the rising of temperature, and the partial pressure of PTC thermistor becomes big and makes rectifier
The DC voltage reduction of 40 outputs, is reduced to preset security voltage range.
PTC thermistor series connection access current supply circuit when, if now the running frequency of compressor M it is very low even in
Stopped status, at this moment because operating current I very littles are for example at mA grades, then the partial pressure in PTC thermistor understands very little, if for example
Operating current I is 1mA, and the fashionable resistance of PTC thermistor rigid connection is 50 ohm, then the partial pressure of PTC thermistor is about 50*
0.001=0.05V, does not have the effect of partial pressure current limliting substantially, and now MCU need to drive compressor M by controlling IPM modules 50
Running frequency raise, because the running frequency of compressor is raised, operating current I can increase, the temperature of PTC thermistor
Also can gradually rise, when operating current I reaches for example several ampere-hours of some value, PTC thermistor is up to due to the liter of temperature
To after Curie point, its resistance is raised rapidly, and the partial pressure of PTC thermistor also increases rapidly, then DC voltage V can drop rapidly
It is low, MCU when DC voltage that rectifier 40 the exports lower limit interval less than predeterminated voltage is detected by voltage sample device 20,
The running frequency of compressor M is driven by controlling IPM modules 60 to be reduced rapidly again so that the DC voltage of the output of rectifier 40
In preset security voltage range.
In sum, according to one embodiment of present invention, when protection device be PTC thermistor, and gate-controlled switch example
When being disconnected such as relay, if the DC voltage that voltage sample device 20 is sampled is not in the preset security voltage zone
Between, control circuit 30 is to control the MCU in circuit by controlling the IPM modules 50 in air-conditioner to adjust the compression in air-conditioner
The running frequency of machine M, so that the DC voltage is in the preset security voltage range.Therefore say, during this period compressor M
Running frequency can with the change of DC voltage dynamic adjust, it is ensured that the operating voltage of the device such as electrochemical capacitor EC1 is at it
That bears is maximum pressure-resistant following.
Further, in an embodiment of the present invention, the DC voltage for being sampled in voltage sample device 20 is pacified more than default
During the interval upper limit of full voltage, MCU also can control air-conditioner reminding module output alarm or prompt message such as sound and/
Or light prompt, to point out the overtension of the alternating current of current input, call user's attention AC power now is in different
State often high.
According to one embodiment of present invention, when the running frequency of compressor M is less than or equal to the first predeterminated frequency for example
10HZ, if lower limit of the DC voltage less than the preset security voltage range that voltage sample device 20 is sampled, control
The control of the circuit 30 such as relay of gate-controlled switch 10 is closed so that protection device such as PTC thermistor short circuit.That is, working as
MCU by control IPM modules 50 so that compressor M running frequency very it is low be, for example, less than 10HZ even zero in the case of, such as
The fruit DC voltage that now voltage sample device is sampled shows the alternating current of input less than the lower limit of preset security voltage range
Voltage reduction, now MCU control relays adhesive, PTC thermistor short circuit goes out current supply circuit, metering function failure, entirely
The voltage of circuit recovers normal, and MCU returns to normal work by the running frequency for controlling IPM modules 50 to drive compressor M
Frequency.Wherein, if closing other loads such as indoor and outdoor blower fan before, recover normal again, if output protection carried
Show that information then closes the output of prompt message so that air-conditioner recovers normal work.
It is understood that the running frequency in compressor M is very low or when being zero, due to operating current I very littles, for example
At mA grades, then the electric current by PTC thermistor is also very low.Due to the electric current step-down by PTC thermistor, its resistance can be returned
Fall to reducing, such as only tens ohm, then the partial pressure very little of PTC thermistor, its partial pressure current limitation effect can almost be ignored,
The DC voltage that then voltage sample device 20 is sampled can truly correspond to the voltage of the alternating current of input, if voltage sample device 20 is adopted
Lower limit of the DC voltage that sample is arrived less than preset security voltage range, it is possible to judge that the current path of the alternating current of input is arrived
In safe range.Wherein, in an example of the invention, the lower limit of preset security voltage range can be electrochemical capacitor EC1
The 80% of highest pressure voltage, and the upper limit of preset security voltage range can be the 90% of electrochemical capacitor EC1 highest pressure voltages, from
And can ensure that the operating voltage of the devices such as electrochemical capacitor EC1 is both less than its maximum pressure voltage always, be conducive to extending electrochemical capacitor
The working life of the devices such as EC1.
According to another embodiment of the invention, as shown in figure 3, working as protection device for cement resistor, and gate-controlled switch example
When being disconnected such as relay, if the DC voltage that voltage sample device 20 is sampled is less than the preset security voltage range
Lower limit, control circuit 30 is to control the MCU in circuit by controlling the IPM modules 50 in air-conditioner to reduce the pressure in air-conditioner
The running frequency of contracting machine M.
Compared with PTC thermistor, because the resistance of cement resistor is constant, in the absence of the situation of change in resistance, when
Voltage sample device 20 sample DC voltage more than preset security voltage range the upper limit when, MCU control relays disconnect so that
Cement resistor series connection is linked into current supply circuit, and because the partial pressure of cement resistor is acted on, DC voltage V can be reduced rapidly, if electric
Pressure sampler 20 samples lower limit of the DC voltage less than preset security voltage range, and MCU is then caused by controlling IPM modules 50
The running frequency of compressor M is reduced rapidly, and can further close other load such as indoor and outdoor blower fans of air-conditioner so that
Operating current I reductions, the partial pressure of such cement resistor can diminish, so that the DC voltage that rectifier 40 will not be caused to export is too low
And influenceing the normal work of compressor M and IPM module 50, it is ensured that air-conditioner is stable.
The overvoltage protection for air-conditioner for proposing according to embodiments of the present invention, samples whole in voltage sample device
When the DC voltage of stream device output is more than the upper limit of preset security voltage range, control circuit control gate-controlled switch disconnects, so
The current supply circuit of protection device incoming transport electricity, so that the too high voltage protected device of the alternating current of input undertakes, keeps away
The damage of electronic component in exempting to cause air-conditioner because of the overtension of the alternating current being input into.Also, in the sampling of voltage sample device
The DC voltage for arriving less than preset security voltage range lower limit when, control circuit by control the IPM modules in air-conditioner with
The running frequency of the compressor in regulation air-conditioner, so that DC voltage is in preset security voltage range.Therefore, the present invention is real
Applying the overvoltage protection for air-conditioner of example can improve the reliability of frequency conversion control circuit of whole air-conditioner, it is ensured that
Air-conditioner is normal, safe and stable, reliability service.
Additionally, embodiments of the invention also proposed a kind of air-conditioner, it includes the above-mentioned overvoltage for air-conditioner
Protection device.
Air-conditioner according to embodiments of the present invention, in the overtension of the alternating current of input, is filled by overvoltage protection
Put so that the too high voltage protected device of the alternating current being input into undertakes, it is to avoid cause because of the overtension of the alternating current being input into
The damage of electronic component in air-conditioner, reliability is greatly improved, and being capable of the operation of normal table ground.
Fig. 5 is the flow chart of the over-voltage protection method of the air-conditioner according to the embodiment of the present invention.Wherein, the air-conditioner bag
Include the above-mentioned overvoltage protection for air-conditioner.As shown in figure 5, the over-voltage protection method of the air-conditioner is including following
Step：
S1, the DC voltage of sampling rectifier output.
S2, in the upper limit of the DC voltage more than preset security voltage range, control gate-controlled switch is disconnected so that protection device
It is connected in series between one end of alternating current and the first input end of rectifier, so that protection device seals in current supply circuit to undertake
The voltage that the alternating current of input is higher by, so as to avoid the electronic component in circuit from being damaged because of overvoltage.And described straight
When stream voltage is less than the lower limit of the preset security voltage range, by controlling the IPM modules in the air-conditioner to adjust
The running frequency of the compressor in air-conditioner is stated, so that the DC voltage is in the preset security voltage range.
According to one embodiment of present invention, when the running frequency of the compressor is less than or equal to the first predeterminated frequency, such as
Really described DC voltage controls the gate-controlled switch closure so that the protection less than the lower limit of the preset security voltage range
Device such as PTC thermistor short circuit.
The over-voltage protection method of air-conditioner according to embodiments of the present invention, the DC voltage of real-time sampling rectifier output
Size, the DC voltage for sampling more than preset security voltage range the upper limit when, control gate-controlled switch disconnect, so guarantor
The current supply circuit of shield device incoming transport electricity, so that the too high voltage protected device of the alternating current of input undertakes, it is to avoid
The damage of electronic component in causing air-conditioner because of the overtension of the alternating current being input into, and in DC voltage less than default peace
During the lower limit in full voltage interval, by controlling the IPM modules in air-conditioner to adjust the running frequency of the compressor in air-conditioner,
So that DC voltage is in preset security voltage range, the reliability of circuit is substantially increased, it is ensured that air-conditioner normal table is transported
OK.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (9)
1. a kind of overvoltage protection for air-conditioner, it is characterised in that including：
Protection device, the protection device is connected on first of the rectifier in one end of the alternating current of input and the air-conditioner
Between input；
Gate-controlled switch, the gate-controlled switch is in parallel with the protection device；
The voltage sample device of the DC voltage that the rectifier of sampling is exported, the voltage sample device is connected to the rectifier
Between first output end and the second output end；
Electrochemical capacitor, the electrochemical capacitor is connected in parallel between the first output end of the rectifier and the second output end；And
Control circuit, the control circuit is connected with the control end and the voltage sample device of the gate-controlled switch respectively, described
Control circuit is controlled in the upper limit of the DC voltage that the voltage sample device is sampled more than preset security voltage range
The gate-controlled switch disconnects so that the protection device is connected in series to one end of the alternating current and the first input of the rectifier
Between end, and lower limit of the DC voltage less than the preset security voltage range sampled in the voltage sample device
When, the control circuit is by controlling the IPM modules in the air-conditioner to adjust the operation of the compressor in the air-conditioner
Frequency, so that the DC voltage is in the preset security voltage range.
2. the overvoltage protection of air-conditioner is used for as claimed in claim 1, it is characterised in that the protection device is for just
Temperature coefficient PTC thermistor or cement resistor.
3. the as claimed in claim 1 overvoltage protection for being used for air-conditioner, it is characterised in that the gate-controlled switch be after
Electrical equipment.
4. the overvoltage protection of air-conditioner is used for as claimed in claim 3, it is characterised in that the control circuit bag
Include：
Controller, the controller is connected with the voltage sample device；
3rd resistor, one end of the 3rd resistor is connected with the controller；
First triode, the base stage of first triode is connected with the other end of the 3rd resistor, first triode
Colelctor electrode be connected with one end of the coil in the relay, the other end of the coil in the relay and the first default electricity
The power supply of pressure is connected, and one end of the switch in the relay and the other end are connected in parallel on the two ends of the protection device；
4th resistance, one end of the 4th resistance is connected with the emitter stage of first triode, the 4th resistance it is another
One end is grounded；
First diode, the anode of first diode is connected with the colelctor electrode of first triode, the one or two pole
The negative electrode of pipe is connected with the power supply of first predeterminated voltage.
5. the overvoltage protection of air-conditioner is used for as claimed in claim 4, it is characterised in that also included：
Power supply circuit, the power supply circuit is connected in parallel between the first output end of the rectifier and the second output end, the confession
The power supply of circuit first predeterminated voltage for the relay is provided, and for the controller provides the second predeterminated voltage
Power supply, wherein, second predeterminated voltage is less than first predeterminated voltage.
6. the overvoltage protection of air-conditioner is used for as claimed in claim 1, it is characterised in that when the fortune of the compressor
Line frequency is less than or equal to the first predeterminated frequency, if the DC voltage that the voltage sample device is sampled is default less than described
The interval lower limit of safe voltage, the control circuit controls the gate-controlled switch closure so that the protection device is short-circuit.
7. a kind of air-conditioner, it is characterised in that including the overvoltage for air-conditioner as any one of claim 1-6
Protection device.
8. a kind of over-voltage protection method of air-conditioner as claimed in claim 7, it is characterised in that comprise the following steps：
The DC voltage that the rectifier of sampling is exported；
The gate-controlled switch is controlled to disconnect so that the guarantor in the upper limit of the DC voltage more than preset security voltage range
Shield devices in series is less than between the first input end of one end of the alternating current and the rectifier in the DC voltage
During the lower limit of the preset security voltage range, by controlling the IPM modules in the air-conditioner with adjusting the air-conditioner
Compressor running frequency so that the DC voltage be in the preset security voltage range.
9. the over-voltage protection method of air-conditioner as claimed in claim 8, it is characterised in that when the compressor operation frequently
Rate is less than or equal to the first predeterminated frequency, if the DC voltage is less than the lower limit of the preset security voltage range, controls institute
Gate-controlled switch closure is stated so that the protection device is short-circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410314284.1A CN104134983B (en) | 2014-07-02 | 2014-07-02 | Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner |
| PCT/CN2014/087309 WO2016000327A1 (en) | 2014-07-02 | 2014-09-24 | Overvoltage protection apparatus for air conditioner, overvoltage protection method, and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410314284.1A CN104134983B (en) | 2014-07-02 | 2014-07-02 | Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104134983A CN104134983A (en) | 2014-11-05 |
| CN104134983B true CN104134983B (en) | 2017-05-31 |
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| CN201410314284.1A Active CN104134983B (en) | 2014-07-02 | 2014-07-02 | Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104134983B (en) |
| WO (1) | WO2016000327A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638616B (en) * | 2014-12-29 | 2017-06-27 | 广东美的制冷设备有限公司 | Anti- voltage surge protection method, the device of transducer air conditioning and transducer air conditioning |
| CN107681626A (en) * | 2017-09-13 | 2018-02-09 | 广东美的制冷设备有限公司 | The protection circuit and its control method of air-conditioner controller |
| CN113054887B (en) * | 2019-12-28 | 2024-01-05 | 南京泉峰科技有限公司 | Overvoltage protection circuit and method of electric tool and electric tool |
| CN111251827B (en) * | 2020-01-20 | 2023-06-23 | 广州华凌制冷设备有限公司 | Air conditioner control method and device, air conditioner and storage medium |
| CN112821350B (en) * | 2020-12-31 | 2023-09-19 | Tcl空调器(中山)有限公司 | Voltage abnormality protection circuit, control method and air conditioner |
| CN112670956B (en) * | 2021-01-18 | 2023-08-04 | 佛山市顺德区美的电子科技有限公司 | Overvoltage protection method and device for air conditioner and air conditioner |
| CN113587377B (en) * | 2021-06-24 | 2023-08-04 | 青岛海信日立空调***有限公司 | Multi-split air conditioner and energy-saving control method thereof |
| CN114243636B (en) * | 2021-12-31 | 2023-12-08 | 华南蓝天航空油料有限公司 | Abnormal current invasion preventing device and method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104134983A (en) | 2014-11-05 |
| WO2016000327A1 (en) | 2016-01-07 |
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