CN110112899A - Drive control circuit and air conditioner - Google Patents
Drive control circuit and air conditioner Download PDFInfo
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- CN110112899A CN110112899A CN201910448284.3A CN201910448284A CN110112899A CN 110112899 A CN110112899 A CN 110112899A CN 201910448284 A CN201910448284 A CN 201910448284A CN 110112899 A CN110112899 A CN 110112899A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The present invention provides a kind of drive control circuit and air conditioners, wherein drive control circuit includes: resistive absorbing circuit, and for absorbing the surging signal in two buss lines, resistive absorbing circuit is in parallel with bus capacitor；Switch element, the process of surging signal is absorbed for regulating and controlling resistive absorbing circuit, and switch element is connected with resistive absorbing circuit；Chip is controlled, for determining whether to export default pulse-width signal to switch element according to the size relation of busbar voltage and preset threshold, chip is controlled and is connected respectively with switch element and sample circuit.The drive control circuit provided through the invention, the case where bus capacitor is to surging signal absorption difference can be effectively relieved, and then promote the stability and reliability of busbar voltage, simultaneously using default pulse-width signal control switch element, the momentary overload capacity demand of resistive absorbing circuit can be effectively reduced, identical surge energy is consumed, cost is lower, and control is simple.
Description
This application claims on 01 16th, 2019 submission Patent Office of the People's Republic of China, application No. is " 2019100417084 ", invention
This is hereby incorporated by reference in the priority of the Chinese patent application of entitled " drive control circuit, air conditioner ", entire contents
In application.
Technical field
The present invention relates to air conditioner technical fields, in particular to a kind of drive control circuit and a kind of air conditioner.
Background technique
Variable frequency air-conditioner controller largely uses AC-DC-AC (AC-DC-exchange) topological structure, structure diagram at present
As shown in Figure 1, specifically including that AC power supplies module 10 ', power filtering module 12 ', rectification module 14 ', filter module 16 ', inversion
Module 18 ' and load 20 '.
Power frequency component after needing to filter smooth stream due to filter module 16 ', so often using the electrolysis electricity of larger capacity
Hold and is used as main filter element.With the promotion of cost and reliability requirement, electrolytic capacitor capacity reduces even no electrolytic capacitor
Control program graduallys mature.
For no electrolytic capacitor control program, electrolytic capacitor is generally replaced using a thin-film capacitor compared with low capacity.By
It in the reduction of bus capacitor capacity, is deteriorated for the absorbability of abnormal surge, leads to the first device of the excessively high damage of DC bus-bar voltage
Part.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an aspect of the invention to propose a kind of drive control circuit.
Another aspect of the present invention is to propose a kind of air conditioner.
In view of this, an aspect of of the present present invention proposes a kind of drive control circuit, comprising: inverter bridge, for driving control
Load running processed, inverter bridge access between high voltage bus and low-voltage bus bar；Reactor, for absorbing drive control circuit driving
The surging signal generated during load running, reactor access between power grid and load；Bus capacitor, for providing load
Required starting voltage is powered on, bus capacitor is also used to absorb surging signal, and bus capacitor is accessed in the mother of inverter bridge input side
In line route；Sample circuit, for being sampled to busbar voltage；Drive control circuit further include: resistive absorbing circuit is used for
The surging signal in two buss lines is absorbed, resistive absorbing circuit is in parallel with bus capacitor；Switch element, for regulating and controlling resistive absorption
Circuit absorbs the process of surging signal, and switch element is connected with resistive absorbing circuit；Control chip, for according to busbar voltage with
The size relation of preset threshold determines whether to export default pulse-width signal to switch element, and it is first with switch respectively to control chip
Part and sample circuit are connected.
Drive control circuit provided by the invention, electricity when surge energy is mainly derived from power input, model machine disorderly closedown
Machine winding, the inductance afterflow of alternating current-direct current side and motor kinetic energy, when surging signal comes temporarily, due to bus capacitor (such as thin-film capacitor
Or low capacity electrolytic capacitor) absorb surge capacity it is limited, busbar voltage can rapid increase, once busbar voltage be more than setting
Threshold value is protected, component will be damaged, to protect component not damaged (the predominantly members such as intelligent power module and capacitor by high pressure
Device), need switch element to work, so that resistive absorbing circuit starts to absorb surge.Specifically, pass through sample circuit reality
When busbar voltage is sampled, control chip gets real-time busbar voltage, by by busbar voltage and preset threshold into
Row compares, can judge busbar voltage whether over-voltage, it is possible to understand that ground exports default pulsewidth modulation in the event of excess pressure
Signal (default pulse-width signal is fixed carrier frequency (such as 40K can be other numerical value), fixed duty cycle (such as 50%,
Can be other duty ratio numerical value) pulse-width signal of form) to switch element, switch element works, resistive absorption electricity
Road starts to absorb surge, and busbar voltage can rapid decrease；It, should when control chip judges that busbar voltage drops to zone of reasonableness
Range can be set according to the actual situation, and control chip turns off default pulse-width signal output, and resistive absorbing circuit terminates
The surge absoption process in this stage.Bus capacitor can be effectively relieved to surge in the drive control circuit provided through the invention
The situation of signal absorption difference, and then the stability and reliability of busbar voltage are promoted, while using default pulse-width signal control
Switch element processed can effectively reduce the momentary overload capacity demand of resistive absorbing circuit, consume identical surge energy, cost
Lower, control is simple.Wherein, the selection of preset threshold, the upper limit are set according to the pressure-resistant degree of component, and lower limit avoids normally
Switch element false triggering in supply district.
Wherein, it controls between chip and switch element and is in series with power amplifier, exported control circuit by power amplifier
Control signal amplification so that control chip being capable of driving switch element.
In addition, providing above-mentioned drive control circuit according to the present invention, can also have the following additional technical features:
In the above-mentioned technical solutions, it is preferable that drive control circuit further include: capacitive absorbing circuit, for absorbing high pressure
Surging signal between bus and low-voltage bus bar, capacitive absorbing circuit are in parallel with bus capacitor；One-way conduction element, for regulating and controlling
Capacitive absorbing circuit absorbs the process of surging signal, and one-way conduction element is connected with capacitive absorbing circuit.
In the technical scheme, drive control circuit further includes capacitive absorbing circuit and one-way conduction element, using unidirectional
Isolation element of the breakover element as capacitive absorbing circuit and bus capacitor, regulation capacitive absorbing circuit absorb the mistake of surging signal
Journey.Specifically, if being no control form by the surge absorbing circuit that one-way conduction element and capacitive absorbing circuit form, when depositing
When being higher than the surging signal of busbar voltage maximum value, one-way conduction element conductive, capacitive absorbing circuit and bus capacitor are simultaneously
It works, absorbs surging signal jointly；It, (can basis when current busbar voltage is greater than some fixed value if it is controllable form
Actual conditions are set), one-way conduction element conductive, surging signal can be introduced into capacitive absorbing circuit with prestissimo, from
And stablize busbar voltage.Wherein, one-way conduction element is the element with one-way conduction characteristic, such as diode.
In the present solution, preferably, one-way conduction element is diode, i.e., forms nothing by diode and capacitive absorbing circuit
The surge absorbing circuit of control form.
In any of the above-described technical solution, it is preferable that resistive absorbing circuit includes: the first resistance element, for surge
Signal is absorbed, and the first resistance element is connected with switch element；Switch element is specifically used for the first resistance element of control to wave
Gush the absorption process of signal.
In the technical scheme, resistive absorbing circuit include the first resistance element, by by the first resistance element access in
Between high voltage bus and low-voltage bus bar, to absorb the surging signal on bus, the quick absorption to surging signal may be implemented, protect
Demonstrate,prove busbar voltage rapid decrease.Wherein, the resistance value Yu busbar voltage of the first resistance element protect threshold value, the overcurrent of switch element
Ability is related, it is preferable that the first resistance element is one or more resistance being connected in series, and resistance can be inductive resistance or nothing
Sensing resistor is not specifically limited herein.Wherein, switch element includes transistor, relay, device for power switching etc..
In any of the above-described technical solution, it is preferable that resistive absorbing circuit further include: arresting element, for discharging first
The peak voltage of resistance element, arresting element are in parallel with the first resistance element.
In the technical scheme, resistive absorbing circuit further includes arresting element, and arresting element is in parallel with the first resistance element,
The Releasing loop of peak voltage as the first resistance element, the first resistance element generates spike electricity when preventing switch element from disconnecting
Pressure, so that component damage is impacted or caused to drive control circuit.
It should be noted that the selection of arresting element is related to the inductance of the first resistance element and resistance value, it is preferable that put
The inductance of the capacitance of electric device and the first resistance element is positively correlated, i.e. the inductance of the first resistance element is smaller, electric discharge member
The capacitance of part is also smaller.If the inductance of the first resistance element is small to can be ignored or do not have, such as the first resistance
Property element be made of one or more concatenated noninductive resistances, then arresting element can not used, it is resistive to be used alone first
Element is as absorber element.Wherein, the composition of arresting element includes but is not limited to following three kinds of modes:
Optionally, arresting element is the tandem compound of diode or diode and resistance, wherein the conducting side of diode
To opposite with the current direction for flowing through the first resistance element.
Optionally, arresting element is capacitor.
Optionally, arresting element includes concatenated resistance and capacitor, that is, uses concatenated RC resonance circuit resistive to first
The peak voltage of element is discharged.
In any of the above-described technical solution, it is preferable that capacitive absorbing circuit includes: the first capacitive element, for absorbing wave
Signal is gushed, the first capacitive element is connected with one-way conduction element；Second resistance element, for discharging the wave in the first capacitive element
Signal is gushed, the second resistance element is in parallel with the first capacitive element.
In the technical scheme, capacitive absorbing circuit includes the first capacitive element and the second resistance element being connected in parallel,
The quantity of first capacitive element and the second resistance element is one or more.
Optionally, the quantity of the second resistance element and the quantity of the first capacitive element correspond, and the first capacitive element
In parallel with the second resistance element, when the quantity of the first capacitive element is multiple, the second resistance element plays the work of balance resistance
With, and electrolytic capacitor discharge process.
Optionally, the quantity of the second resistance element is multiple, after the series connection of multiple second resistance elements with the first capacitive element
It is in parallel.
In any of the above-described technical solution, it is preferable that capacitive absorbing circuit includes: the second capacitive element, for absorbing height
The surging signal on bus and low-voltage bus bar is pressed, the second capacitive element is connected with the first capacitive element；Third resistance element, is used for
The surging signal in the second capacitive element is discharged, third resistance element is in parallel with the second capacitive element.
In the technical scheme, capacitive absorbing circuit further includes the second capacitive element being connected in parallel and the resistive member of third
The quantity of part, the second capacitive element and third resistance element is one or more.Wherein, the second capacitive element and the first capacitive
The capacitance of element can be the same or different, it is preferable that the second resistance element is identical as the resistance value of third resistance element, with flat
Weigh the voltage of the first capacitive element and the second capacitive element, and electrolytic capacitor discharge process.
In any of the above-described technical solution, it is preferable that drive control circuit further include: the 4th resistance element, for limiting
The electric current of capacitive absorbing circuit is flowed through, the 4th resistance element is connected on the branch where capacitive absorbing circuit and one-way conduction element
Road.
In the technical scheme, drive control circuit further includes the 4th resistance element, by the 4th resistance element to flowing through
The electric current of capacitive absorbing circuit carries out current limliting.Wherein, different from the capacitance of the second capacitive element according to the first capacitive element, the 4th
Resistance element selection is also different.
In any of the above-described technical solution, it is preferable that control chip is specifically used for: being more than or equal to based on busbar voltage
In the case where first preset threshold, default pulse-width signal is exported to switch element；It is default less than second based on busbar voltage
In the case where threshold value, stop exporting default pulse-width signal；Wherein the first preset threshold is greater than the second preset threshold.
In the technical scheme, the first preset threshold and the second preset threshold are that the busbar voltage for being directed to software and being arranged is protected
Threshold value is protected, the first preset threshold and the second preset threshold respectively correspond the conduction threshold and shutdown threshold value of switch element, by bus
Voltage is compared with the first preset threshold and the second preset threshold respectively, is more than or equal to the first default threshold in busbar voltage
In the case where value, control chip is judged as busbar voltage over-voltage, exports default pulse-width signal control switch element conductive,
In the case that busbar voltage is less than the second preset threshold, control chip is judged as that busbar voltage drops to zone of reasonableness, to close
Disconnected switch element.
In any of the above-described technical solution, it is preferable that drive control circuit further include: comparison circuit, for according to bus
The corresponding level signal of voltage output is connected to chip, the input terminal of comparison circuit is controlled with the output end of sample circuit, than
Output end compared with circuit is connected with control chip；Chip is controlled, is also used to be determined whether according to level signal to export default arteries and veins
Wide modulated signal is to switch element.
In the technical scheme, it is contemplated that the delay of software sampling, hardware can most notify software to carry out PWM output fastly,
So by hardware comparison circuit judge busbar voltage whether over-voltage, and export corresponding level signal to chip is controlled, control core
Piece according to level signal judge busbar voltage whether over-voltage, to open or turn off switch element.
In any of the above-described technical solution, it is preferable that comparison circuit is specifically used for: being greater than or equal to the based on busbar voltage
In the case where three preset thresholds, the first level signal is exported；And the 4th preset threshold is less than or equal to based on busbar voltage
In the case of, export second electrical level signal；Control chip is specifically used for: receiving the first level signal or is being turned by second electrical level
In the case where energizing signal for the first level, default pulse-width signal is exported to switch element；Third predetermined threshold value is greater than
First preset threshold；Third predetermined threshold value is greater than the 4th preset threshold, and the 4th preset threshold is greater than the first preset threshold.
In the technical scheme, third, the 4th preset threshold are that the busbar voltage for being directed to hardware comparison circuit and being arranged is protected
Threshold value is protected, in the case where busbar voltage is greater than or equal to third predetermined threshold value, comparison circuit generates over-voltage signal and is conveyed to control
Coremaking piece, specifically, the first level signal of output is to controlling chip；When busbar voltage is less than or equal to four preset thresholds,
Output second electrical level signal is to controlling chip.Control chip is receiving the first level signal or is receiving by second electrical level
When switching to the energizing signal of the first level, default pulse-width signal is exported to switch element, specifically, to preset carrier frequency
The switching signal of the default duty ratio form of output to switch element, switching elements conductive, resistive absorbing circuit starts to intervene, bus
Voltage meeting rapid decrease turns off default arteries and veins in the case that control chip detects that busbar voltage drops to the 4th preset threshold
Wide modulated signal output, switch element disconnect, and resistive absorbing circuit terminates the surge absoption process in this stage.
Assuming that original levels are high level, then the first level signal is low level, and second electrical level signal is high level, instead
It, if original levels are low level, the first level signal is high level, and second electrical level signal is low level.
In any of the above-described technical solution, it is preferable that drive control circuit further includes rectification circuit, and rectification circuit is to exchange
Output is bus signal after signal is rectified, and bus signal is exported through high voltage bus and low-voltage bus bar to bus capacitor, inversion
Bridge and load, wherein control chip according to the on state of AC signal control switch element.
In the technical scheme, it is bus voltage signal, busbar voltage letter that ac voltage signal is handled by rectification circuit
Number and ac voltage signal can be used as the decision condition of control switch element conductive or cut-off.
In any of the above-described technical solution, it is preferable that control chip according to the conducting shape of AC signal control switch element
State specifically: be compared the corresponding voltage value of the AC signal acquired in real time with pre-set 5th threshold value, determining should
Voltage value is greater than or equal to the 5th threshold value, then control switch element conductive；By the corresponding voltage value of AC signal with preset
The 6th threshold value be compared, determine the voltage value be less than or equal to the 6th threshold value, then control switch element end.Wherein,
Five threshold values, the 6th threshold value are the conduction threshold of pre-set switch element and shutdown threshold value according to AC signal.In addition, right
It, can also be according to the conduction threshold (the 7th threshold value) and shutdown threshold value of the pre-set switch element of AC signal in comparison circuit
(the 8th threshold value).7th threshold value is greater than the 8th threshold value, and the 8th threshold value is greater than the 5th threshold value, and the 5th threshold value is greater than the 6th threshold value.
In any of the above-described technical solution, it is preferable that bus capacitor is thin-film capacitor.
In any of the above-described technical solution, it is preferable that default pulse-width signal (including carrier frequency and duty ratio)
Selection and the first preset threshold, resistance value, rated power and the momentary overload capacity of the first resistance element are related.
In any of the above-described technical solution, the capacitance of bus capacitor is less than preset capacity, and preset capacity is calculated as follows
Formula calculates:
Wherein, CdcFor preset capacity, LSThe total inductance value of equivalent drive control circuit DC side, PLIt is drive control circuit
Bearing power, RSThe all-in resistance of equivalent drive control circuit DC side, vdc0For busbar voltage average value, for example, with 7P model machine
For, C is determined according to the calculation formuladcHave to be larger than 840uF, preset capacity is 840uF or more, in the specific implementation be
1230uF。
Another aspect of the present invention proposes a kind of air conditioner, comprising: motor；Such as the drive of any one of above-mentioned technical proposal
Dynamic control circuit, the signal input part of motor are connected to drive control circuit, and the driving signal of drive control circuit output is used for
Driving motor operation.
Air conditioner provided by the invention includes the drive control circuit such as any one of above-mentioned technical proposal, thus having should
The technical effect of drive control circuit whole, repeats no more.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the structural schematic diagram of the controller of transducer air conditioning in the prior art；
Fig. 2 shows the structural schematic diagrams of drive control circuit according to an embodiment of the invention；
Fig. 3 shows the structural schematic diagram of drive control circuit according to another embodiment of the invention；
Fig. 4 shows the structural schematic diagram of the drive control circuit of still another embodiment in accordance with the present invention；
Fig. 5 shows the structural schematic diagram of drive control circuit according to still another embodiment of the invention；
Fig. 6 shows the structural schematic diagram of drive control circuit according to still another embodiment of the invention；
Fig. 7 shows the structural schematic diagram of drive control circuit according to still another embodiment of the invention；
Fig. 8 shows absorption surge schematic diagram according to an embodiment of the invention.
Wherein, the corresponding relationship in Fig. 1 between appended drawing reference and component names are as follows:
10 ' AC power supplies modules, 12 ' power filtering modules, 14 ' rectification modules, 16 ' filter modules, 18 ' inverter modules, 20 '
Load；
Wherein, corresponding relationship of the Fig. 2 into Fig. 7 between appended drawing reference and component names are as follows:
10 inverter bridges, 12 reactors, 14 bus capacitors, 16 resistive absorbing circuits, 18 switch elements, 20 comparison circuits, 22
Control chip, 24 capacitive absorbing circuits, 26 one-way conduction elements, 28 first resistance elements, 30 arresting elements, 32 first capacitives member
Part, 34 second resistance elements, 36 second capacitive elements, 38 third resistance elements, 40 the 4th resistance elements, 42 rectification circuits.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Drive control circuit and air conditioner according to some embodiments of the invention are described referring to Fig. 2 to Fig. 8.
An aspect of of the present present invention embodiment provides a kind of drive control circuit.
As shown in Fig. 2, the structural schematic diagram of drive control circuit according to first embodiment of the invention.Wherein, should
Drive control circuit, comprising: inverter bridge 10 is used for drive control load running, and inverter bridge 10 is accessed in high voltage bus and low pressure
Between bus；Reactor 12, for absorbing the surging signal generated during drive control circuit driving load running, reactor
12 accesses are between power grid and load；Bus capacitor 14 powers on required starting voltage for providing load, and bus capacitor 14 is also
For absorbing surging signal, bus capacitor 14 is accessed in the two buss lines of 10 input side of inverter bridge；Sample circuit, for mother
Line voltage is sampled；Drive control circuit further include: resistive absorbing circuit 16, for absorbing the letter of the surge in two buss lines
Number, resistive absorbing circuit 16 is in parallel with bus capacitor 14；Switch element 18 absorbs surge letter for regulating and controlling resistive absorbing circuit 16
Number process, switch element 18 connects with resistive absorbing circuit 16, and when switch element 18 is connected, resistive absorbing circuit 16 absorbs wave
Signal is gushed, when switch element 18 ends, resistive absorbing circuit 16 stops absorbing surging signal；Chip 22 is controlled, for according to mother
The size relation of line voltage and preset threshold determines whether to export default pulse-width signal to switch element 18, controls chip 22
It is connected respectively with switch element 18 and sample circuit.
Drive control circuit provided in an embodiment of the present invention, surge energy is mainly derived from power input, model machine failure is stopped
Machine winding, the inductance afterflow of alternating current-direct current side and motor kinetic energy when machine, when surging signal comes temporarily, (such as due to bus capacitor 14
Thin-film capacitor or low capacity electrolytic capacitor) to absorb surge capacity limited, busbar voltage can rapid increase, once busbar voltage is super
The protection threshold value for crossing setting, may be damaged component, to protect component not damaged (predominantly intelligent power module by high pressure
And the components such as capacitor), need switch element 18 to work, so that resistive absorbing circuit 16 starts to absorb surge.Specifically,
Busbar voltage is sampled in real time by sample circuit, control chip 22 gets real-time busbar voltage, by by bus
Voltage is compared with preset threshold, can judge busbar voltage whether over-voltage, it is possible to understand that ground, in the event of excess pressure,
Exporting default pulse-width signal, (default pulse-width signal is fixed carrier frequency (such as 40K can be other numerical value), admittedly
Determine the pulse-width signal of duty ratio (such as 50%, can be other duty ratio numerical value) form) to switch element 18, switch element
18 work, and resistive absorbing circuit 16 starts to absorb surge, and busbar voltage can rapid decrease；When control chip judges bus electricity
When zone of reasonableness is down in pressure, which can be set according to the actual situation, and control chip 22 turns off default pulsewidth modulation letter
Number output, resistive absorbing circuit 16 terminate the surge absoption process in this stage.The drive control circuit provided through the invention, can
The case where bus capacitor is to surging signal absorption difference is effectively relieved, and then the stability and reliability of busbar voltage are promoted, together
When using default pulse-width signal control switch element 18, the momentary overload capacity that can effectively reduce resistive absorbing circuit needs
It asks, consumes identical surge energy, cost is lower, and control is simple.Wherein, the selection of preset threshold, the upper limit is according to component
Pressure-resistant degree and set, lower limit avoids switch element false triggering within the scope of normal power supply.
Wherein, it controls between chip 22 and switch element 18 and is in series with power amplifier, by power amplifier by control circuit
The control signal of output amplifies, so that control chip 22 being capable of driving switch element 18.
In one embodiment of the invention, it is preferable that drive control circuit further include: capacitive absorbing circuit 24 is used for
The surging signal in two buss lines is absorbed, capacitive absorbing circuit 24 is in parallel with bus capacitor 14；One-way conduction element 26, for adjusting
Control capacitive absorbing circuit 24 absorbs the process of the surging signal, and one-way conduction element 26 is connected with capacitive absorbing circuit 24, single
When being connected to breakover element 26, capacitive absorbing circuit 24 absorbs surging signal, and when one-way conduction element 26 ends, capacitive absorbs electricity
Road 24 stops absorbing surging signal.
In this embodiment, drive control circuit further includes capacitive absorbing circuit 24 and one-way conduction element 26, uses list
Isolation element to breakover element 26 as capacitive absorbing circuit 24 and bus capacitor 14, so as to limit capacitive absorbing circuit
The absorption process of 24 pairs of surging signals.Specifically, if the wave being made of one-way conduction element 26 and capacitive absorbing circuit 24
Gushing absorbing circuit is no control form, when there is the surging signal for being higher than current busbar voltage maximum value, one-way conduction element 26
Conducting, capacitive absorbing circuit 24 work simultaneously with bus capacitor 14, absorb surging signal jointly；If it is controllable form, when
Preceding busbar voltage (can be set) according to the actual situation when being greater than some fixed value, and one-way conduction element 26 is connected, surge letter
Number it can be introduced into capacitive absorbing circuit 24 with most fast, to stablize busbar voltage, be simultaneously stopped motor.Wherein, one-way conduction
Element 26 is the element with one-way conduction characteristic, such as diode.Specifically, as shown in Fig. 2, one-way conduction element 26 is two
Pole pipe forms the surge absorbing circuit without control form by diode and capacitive absorbing circuit 24.
In another embodiment of the present invention, one-way conduction element 26 can also be substituted by switch element, such as three poles
Pipe, relay etc..
In one embodiment of the invention, as shown in Figure 2, it is preferable that resistive absorbing circuit 16 includes: first resistive yuan
Part 28, for absorbing to surging signal, the first resistance element 28 is connected with switch element 18；Switch element 18, it is specific to use
In the first resistance element 28 of control to the absorption process of surging signal.
In this embodiment, resistive absorbing circuit 16 includes the first resistance element 28, by connecing the first resistance element 28
Enter between high voltage bus and low-voltage bus bar, to absorb the surging signal on bus, the quick suction to surging signal may be implemented
It receives, guarantees busbar voltage rapid decrease.Wherein, the resistance value Yu busbar voltage of the first resistance element 28 protect threshold value, switch element
18 overcurrent capability is related, it is preferable that the first resistance element 28 is one or more resistance being connected in series, and resistance can be
Inductive resistance or noninductive resistance, are not specifically limited herein.Wherein, switch element includes transistor, relay etc..
In another embodiment of the present invention, as shown in Figure 3, Figure 4, it is preferable that resistive absorbing circuit 16 further include: put
Electric device 30, for discharging the peak voltage of the first resistance element 28, arresting element 30 is in parallel with the first resistance element 28.
In this embodiment, resistive absorbing circuit 16 further includes arresting element 30, arresting element 30 and the first resistance element
28 is in parallel, the discharge loop of the peak voltage as the first resistance element 28, first resistive yuan when preventing switch element 18 from disconnecting
Part 28 generates peak voltage, to impact to drive control circuit or component damage.
It should be noted that the selection of arresting element 30 is related to the inductance of the first resistance element 28 and resistance value, preferably
The inductance of ground, the capacitance of arresting element 30 and the first resistance element 28 is positively correlated, i.e. the inductance of the first resistance element 28
Smaller, the capacitance of arresting element 30 is also smaller.If the inductance of the first resistance element 28 it is small to can be ignored or
No, such as the first resistance element 28 is made of one or more concatenated noninductive resistances, then arresting element can not used
30, the first resistance element 28 is used alone and is used as absorber element.
In one embodiment of the invention, as shown in Figure 2, it is preferable that using anti-paralleled diode to first resistive yuan
The peak voltage of part 28 is discharged.
Optionally, arresting element 30 includes concatenated diode and resistance, wherein the conducting direction of diode and flows through the
The current direction of one resistance element 28 is opposite.
Optionally, arresting element 30 is capacitor.
Optionally, arresting element 30 includes concatenated resistance and capacitor, i.e., is hindered using concatenated RC resonance circuit first
The peak voltage of property element 28 is discharged.
In one embodiment of the invention, as shown in Figure 2, it is preferable that capacitive absorbing circuit 24 includes: the first capacitive member
Part 32, for absorbing surging signal, the first capacitive element 32 is connected with one-way conduction element 26；Second resistance element 34, is used for
The surging signal in the first capacitive element 32 is discharged, the second resistance element 34 is in parallel with the first capacitive element 32.
In this embodiment, capacitive absorbing circuit 24 includes the first capacitive element 32 and the second resistance element being connected in parallel
34, the quantity of the first capacitive element 32 and the second resistance element 34 is one or more, specifically, as shown in Fig. 2, first holds
The quantity of property element 32 and the second resistance element 34 is one.
Optionally, the quantity of the second resistance element 34 and the quantity of the first capacitive element 32 correspond, and the first capacitive
Element 32 is in parallel with the second resistance element 34, and when the quantity of the first capacitive element 32 is multiple, the second resistance element 34 is played
The effect of balance resistance, and electrolytic capacitor discharge process.
Optionally, the quantity of the second resistance element 34 is multiple, multiple second resistance elements 34 connect after with the first capacitive
Element 32 is in parallel.
In one embodiment of the invention, as shown in Figure 2, it is preferable that capacitive absorbing circuit 24 includes: the second capacitive member
Part 36, for absorbing the surging signal on high voltage bus and low-voltage bus bar, the second capacitive element 36 and the first capacitive element 32 are gone here and there
Connection；Third resistance element 38, for discharging the surging signal in the second capacitive element 36, third resistance element 38 and the second capacitive
Element 36 is in parallel.
In this embodiment, capacitive absorbing circuit 24 further includes the second capacitive element 36 being connected in parallel and the resistive member of third
The quantity of part 38, the second capacitive element 36 and third resistance element 38 is one or more, specifically, as shown in Fig. 2, second
The quantity of capacitive element 36 and third resistance element 38 is one.Wherein, the second capacitive element 36 and the first capacitive element 32
Capacitance can be the same or different, it is preferable that the second resistance element 34 is identical as the resistance value of third resistance element 38, with balance
The voltage of first capacitive element 32 and the second capacitive element 36, and electrolytic capacitor discharge process.
In one embodiment of the invention, as shown in Figure 2, it is preferable that drive control circuit further include: the 4th resistive yuan
Part 40, for limiting the electric current for flowing through capacitive absorbing circuit 24, the 4th resistance element 40 is connected on capacitive absorbing circuit 24 and list
Branch to where breakover element 26.
In this embodiment, drive control circuit further includes the 4th resistance element 40, passes through 40 convection current of the 4th resistance element
Electric current through capacitive absorbing circuit 24 carries out current limliting.Wherein, according to the capacitance of the first capacitive element 32 and the second capacitive element 36
Difference, the selection of the 4th resistance element 40 are also different.
In one embodiment of the invention, it is preferable that control chip 22 be specifically used for: be greater than based on busbar voltage or
In the case where the first preset threshold, default pulse-width signal is exported to switch element；Based on busbar voltage less than second
In the case where preset threshold, stop exporting default pulse-width signal；Wherein the first preset threshold is greater than the second preset threshold.
In this embodiment, the first preset threshold and the second preset threshold are the busbar voltage protections for being directed to software and being arranged
Threshold value, the first preset threshold and the second preset threshold respectively correspond the conduction threshold and shutdown threshold value of switch element 18, by bus
Voltage is compared with the first preset threshold and the second preset threshold respectively, is more than or equal to the first default threshold in busbar voltage
In the case where value, control chip 22 is judged as busbar voltage over-voltage, exports default pulse-width signal control switch element 18 and leads
Logical, in the case where busbar voltage is less than the second preset threshold, control chip 22 is judged as that busbar voltage drops to zone of reasonableness,
To turn off switch element 18.
In one embodiment of the invention, as shown in Figure 2, it is preferable that drive control circuit further include: comparison circuit
20, for exporting corresponding level signal to control chip 22, the input terminal and sampling electricity of comparison circuit 20 according to busbar voltage
The output end on road is connected, and the output end of comparison circuit 20 is connected with control chip 22；Chip 22 is controlled, is also used to according to electricity
Ordinary mail number determines whether to export default pulse-width signal to switch element 18.
In this embodiment, it is contemplated that the delay of software sampling, hardware can most notify software to carry out PWM output, institute fastly
With by hardware comparison circuit 20 judge busbar voltage whether over-voltage, and export corresponding level signal to control chip 22, control
Chip 22 according to level signal judge busbar voltage whether over-voltage, to open or turn off switch element 18.
In one embodiment of the invention, it is preferable that comparison circuit 20 is specifically used for: being greater than based on busbar voltage or is waited
In the case where third predetermined threshold value, the first level signal is exported；And the 4th default threshold is less than or equal to based on busbar voltage
In the case where value, second electrical level signal is exported；Control chip 22 is specifically used for: receiving the first level signal or by second
In the case that level signal switchs to the energizing signal of the first level signal, default pulse-width signal is exported to switch element；The
Three preset thresholds are greater than the first preset threshold；Third predetermined threshold value is greater than the 4th preset threshold, and the 4th preset threshold is greater than first
Preset threshold.
In this embodiment, third, the 4th preset threshold are the busbar voltage guarantor of setting for hardware comparison circuit 20
Shield protection threshold value, in the case where busbar voltage is greater than or equal to third predetermined threshold value, it is defeated that comparison circuit 20 generates over-voltage signal
Control chip 22 is given, specifically, the first level signal of output to control chip 22；It is pre- to be less than or equal to the 4th in busbar voltage
If when threshold value, output second electrical level signal is to controlling chip.Control chip 22 is receiving the first level signal or is receiving
When to the energizing signal for switching to the first level by second electrical level, default pulse-width signal is exported to switch element, specifically, with
Default carrier frequency exports the control signal of default duty ratio form to switch element, switching elements conductive, resistive absorbing circuit
Start to intervene, busbar voltage meeting rapid decrease, when control chip 22 detects that busbar voltage drops to the feelings of the 4th preset threshold
Under condition, default pulse-width signal output is turned off, switch element 18 disconnects, and the surge that resistive absorbing circuit 16 terminates this stage is inhaled
Receipts process.
Assuming that original levels are high level, then the first level signal is low level, and second electrical level signal is high level, instead
It, if original levels are low level, the first level signal is high level, and second electrical level signal is low level.In the present invention
Another embodiment in, as shown in figure 5, drive control circuit simultaneously use resistive absorbing circuit 16 and capacitive absorbing circuit
24, the surge absoption process of resistive absorbing circuit 16 is controlled using switch element 18, is controlled using one-way conduction element (diode)
The surge absoption process of capacitive absorbing circuit processed.
In another embodiment of the present invention, as shown in Figure 6, Figure 7, resistive absorption electricity is used alone in drive control circuit
Road 16.In comparison, drive control circuit shown in fig. 5 is more preferable to the assimilation effect of surge energy, and busbar voltage is more stable.
In any of the above-described embodiment, it is preferable that the selection of carrier frequency and duty ratio and the first preset threshold, the first resistance
Property the resistance value of element 28, rated power and momentary overload capacity it is related.
In another embodiment of the present invention, it is preferable that drive control circuit further includes rectification circuit 42, rectification circuit
Output is bus signal after 42 pairs of AC signals rectify, and bus signal is exported through high voltage bus and low-voltage bus bar to bus electricity
Hold 14, inverter bridge 10 and load, wherein control chip according to the on state of AC signal control switch element 18.
In this embodiment, AC signal is bus signal, bus signal and AC signal by the processing of rectification circuit 42
It can be used as the decision condition of 18 on or off of control switch element.
Specifically, after bus signal can be by the voltage and/or reactor 12 before reactor 12 after detection rectification circuit 42
Voltage before inverter bridge 10 obtains；AC signal is the voltage letter before AC-input voltage peak signal and/or rectification circuit 42
Number.
In any of the above-described embodiment, it is preferable that control chip according to the conducting shape of AC signal control switch element 18
State specifically: be compared the corresponding voltage value of the AC signal acquired in real time with pre-set 5th threshold value, determining should
Voltage value is greater than or equal to the 5th threshold value, then control switch element 18 is connected；By the corresponding voltage value of AC signal with set in advance
The 6th threshold value set is compared, and determines that the voltage value is less than or equal to the 6th threshold value, then control switch element 18 ends.Its
In, the 5th threshold value, the 6th threshold value are the conduction threshold of pre-set switch element 18 and shutdown threshold value according to AC signal.
In addition, for comparison circuit 20, it can also be according to conduction threshold (the 7th threshold of the pre-set switch element 18 of AC signal
Value) and shutdown threshold value (the 8th threshold value).7th threshold value is greater than the 8th threshold value, and the 8th threshold value is greater than the 5th threshold value, and the 5th threshold value is big
In the 6th threshold value.
In any of the above-described embodiment, it is preferable that bus capacitor 14 is thin-film capacitor.
In any of the above-described embodiment, the capacitance of bus capacitor 14 is less than preset capacity, and preset capacity is calculated as follows
Formula is calculated:
Wherein, CdcFor preset capacity, LSThe total inductance value of equivalent drive control circuit DC side, PLIt is drive control circuit
Bearing power, RSThe all-in resistance of equivalent drive control circuit DC side, vdc0For busbar voltage average value, for example, with 7P model machine
For, C is determined according to the calculation formuladcHave to be larger than 840uF, preset capacity is 840uF or more, in the specific implementation be
1230uF。
In order to better illustrate the present invention, parameter is arranged with 6KW model machine actual motion:
Reactor Lac refers to practical Inductor model and input power cord inductance, and it includes inductance and resistances, existing
Organic type uses Inductor 25mH, and the inductance of 500 milliohms, input power cord is less than or equal to 10mH (numerical value amplification), resistance
Not less than 0.5 Europe (actual use about 1.2 Europe of conductor resistance)；
Reactor 12 refers to actual DC side inductor models, and it includes inductance and resistance, 4.5mH, 120 milliohms；
R4 is system damping resistance (is not more than 200 Europe, 68 Europe are used on 16KW model machine, is practical not use),
Damping resistance R4 does not increase when reactor 12 selects 4.5mH, can also be without R4 without reactor 12 on 6KW model machine.
It should be understood that Lac and reactor 12 are existed for EMC harmonic requirement, if it is there is harmonic requirement area
Domain, there may be Lac to be also likely to be present reactor 12 on model machine, in some instances it may even be possible to which Lac and reactor 12 coexist.And for no harmonic wave
It is required that region, Lac and reactor 12 are all not present, but in order to which high-frequency harmonic problem (if ignoring the problem, can not make
With reactor 12), understand and use a lesser reactor Ldc at 12 position of reactor of circuit topology, on this lesser Ldc
A small damping resistance in parallel is to improve system stability.
Arresting element 30 is anti-paralleled diode, the selection of the diode and the inductance and resistance value of the first resistance element 28
Correlation can not use arresting element 30 if the first resistance element 28 is noninductive resistance, and the is used on current 6KW model machine
One resistance element 28 is connected by the absorption resistance that 4 specifications are the A watts of Europe B.
The limitation for being continuously turned on the time about absorption resistance calculates: being assumed to be software set 720V conducting, hardware setting
800V conducting, due to detection filter etc., is actually turned on voltage and is up to 800V.Due to being four absorption resistance series connection, therefore
Maximum voltage is 200V on each absorption resistance.Then (200 × 200 ÷ B) ÷ t=A, thus can find out t, that is to say, that at 1 second
It should not be more than t that the time is continuously turned in time.
Operation explanation:
When model machine powers on, after the rectified circuit 42 of input voltage rectifies while to bus capacitor 14 and capacitive absorbing circuit 24
In the first capacitive element 32 and the second capacitive element 36 charging, at this time if input voltage (150V in normal setting range
~264V), when being less than 294V, hardware protection voltage threshold is set as 800V, software protection threshold value is 720V, corresponding exchange
Input virtual value is 720 ÷, 1.414 ÷ 1.732=294V, and model machine works normally, and switch element 18 is not turned on.After charging,
Absorption resistance both end voltage is stablized at Vdc-max value (variation is slow).
When model machine operates normally, voltage is normal to transport with 6 times of alternating current input power supplying frequency of frequency fluctuation on bus capacitor 14
Busbar voltage maximum value is 264 × 1.414 × 1.732=646V when row, much smaller than the protection threshold value of setting, therefore switch element
18 will not work.
Compressor winding, the inductance afterflow of alternating current-direct current side when surge energy is mainly derived from power input, model machine disorderly closedown
And compression maneuver energy；When surge comes temporarily, since bus capacitor 14 (thin-film capacitor or low capacity electrolytic capacitor) absorbs wave
It is limited to gush ability, busbar voltage can rapid increase.
Illustrate: being at present four threshold voltages in total, is two, two points of software of two of software and hardware respectively
Not are as follows: the first preset threshold V2, the second preset threshold V1；Two of hardware are respectively as follows: third predetermined threshold value V3, the 4th default threshold
Value V4, wherein V3 > V4 > V2 > V1.Corresponding state is different, and when triggering the first preset threshold V2, software is in spite of having
Comparator interrupt signal can all export PWM control switch device；When triggering the second preset threshold V1, software switching-off PWM output；
When triggering the third predetermined threshold value V4 of hardware, control chip can just receive the interrupt signal of comparator generation, output PWM letter
Number, when triggering the 4th preset threshold V4, shutdown PWM output.
For DC bus-bar voltage through divider resistance R5 and R6, the busbar voltage after partial pressure enters the AD thief hatch of control chip 22
With the input terminal of comparison circuit 20；When busbar voltage after partial pressure is greater than the given threshold of comparison circuit 20, comparison circuit 20
Output becomes the first level from second electrical level, and level translation signal enters the external interrupt mouth of control chip 22.When control chip
22 receive external interrupt signal, are judged as that current busbar voltage is more than 800V；Control chip 22 controls motor and starts to drop at this time
Frequency is run, while with fixed carrier frequency (such as 40K), fixed duty cycle (such as 50%) form exports pwm switching signal to switch
Element 18；Due to the intervention of absorption resistance, busbar voltage meeting rapid decrease controls chip when being lower than the second preset threshold V1
22 shutdown pwm switching signal outputs, switch element 18 disconnect, and absorption resistance no longer works.Surge process is as shown in Figure 8.
In addition, in order to protect absorption resistance, in 1s to be continuously turned on the sum of time restricted, in the first preset threshold V2
In the case where for 720V, due to software detection delay etc., hardware most conference starts to act in 800V, then four A watts of Europe B
It is t1 that concatenated absorption resistance is continuously turned on time restriction in 1s, and if t is 1.25ms, then t1 is 1ms.
It should be noted that the selection of carrier frequency and duty ratio depends mainly on the first preset threshold V2 of setting, inhales
Receive the resistance value of resistance, the rated power and momentary overload capacity of absorption resistance；In general, the rated power of absorption resistance is bigger
Its momentary overload capacity is also bigger, therefore under identical threshold value V2, and the duty ratio that can be opened is bigger or carrier frequency
Smaller (i.e. the period is bigger).Such as 16KW model machine, in the case where V2 is 800V, absorption resistance is connected using two Europe 20W10, when conducting
Between be 1.5ms.
In addition it is possible to use a variety of fixed duty cycle form combinations, such as within the one or more periods initially turned on,
PWM duty cycle is 70%；Subsequent multiple periods are open-minded in the form of 50% (can be other duty ratio numerical value).
About the first preset threshold V2 and the second preset threshold V1, it is set as fixed 720V and 700V herein, can be
Value (such as the Vdc-max value before detecting on several detection cycles (such as 100ms), and using Vdc-max+ △ V as switching of floating
Element 18 turns off voltage threshold (i.e. the second preset threshold V1), using Vdc-max+ △ V+20V (can be other values) as switch
18 conducting voltage threshold value of element (the first preset threshold V2).It is, of course, also possible to the peak value for detection exchange input be expanded, with exchange
Peak value Vac-max+ △ V is inputted as the second preset threshold V1, using Vdc-max+ △ V1+20V (can be other values) as the
One preset threshold V2.
In addition, about over-voltage and exiting the judgement of over-voltage, the present invention is generated compared with given threshold by hardware comparator
Level conversion is judged as over-voltage, and software real-time detection busbar voltage is set as exiting over-voltage lower than some value；Preferably, Ke Yikuo
Exhibition is over-voltage and exits over-voltage and all given by hardware hysteresis comparator.
Another aspect of the present invention proposes a kind of air conditioner, comprising: motor；Such as the driving of any one of above-described embodiment
Control circuit, the signal input part of motor are connected to drive control circuit, and the driving signal of drive control circuit output is for driving
Dynamic motor operation.
Air conditioner provided in an embodiment of the present invention includes the drive control circuit such as any one of above-described embodiment, thus is had
There is the technical effect of drive control circuit whole, repeats no more.
In the description of this specification, term " first ", " second " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance, unless otherwise clearly defined and limited；Term " connection ", " installation ", " fixation " etc. should all be done extensively
Reason and good sense solution, for example, " connection " may be fixed connection or may be dismantle connection, or integral connection；It can be direct phase
It even, can also be indirectly connected through an intermediary.For the ordinary skill in the art, it can manage as the case may be
Solve the concrete meaning of above-mentioned term in the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of drive control circuit, comprising: inverter bridge is used for drive control load running, and the inverter bridge access is in high pressure
Between bus and low-voltage bus bar；It is characterized in that, the drive control circuit further include: reactor, for absorbing the driving
Control circuit drives the surging signal generated during the load running, and the reactor access is in power grid and the load
Between；Bus capacitor is used to provide the described load and powers on required starting voltage, and the bus capacitor is also used to absorb the surge
Signal, the bus capacitor access is in the two buss lines of the inverter bridge input side；Sample circuit, for bus signal into
Row sampling is to determine busbar voltage；And the drive control circuit further include:
Resistive absorbing circuit, for absorbing the surging signal in the two buss lines, the resistive absorbing circuit and the bus
Capacitor is in parallel；
Switch element absorbs the process of the surging signal, the switch element and institute for regulating and controlling the resistive absorbing circuit
State resistive absorbing circuit series connection；
Chip is controlled, exports default pulsewidth modulation for determining whether according to the size relation of the busbar voltage and preset threshold
Signal to the switch element, the control chip is connected with the switch element and the sample circuit respectively.
2. drive control circuit according to claim 1, which is characterized in that further include:
Capacitive absorbing circuit, for absorbing the surging signal in the two buss lines, the capacitive absorbing circuit and the bus
Capacitor is in parallel；
One-way conduction element absorbs the process of the surging signal, the one-way conduction for regulating and controlling the capacitive absorbing circuit
Element is connected with the capacitive absorbing circuit.
3. drive control circuit according to claim 2, which is characterized in that the resistive absorbing circuit includes:
First resistance element, for being absorbed to the surging signal, first resistance element and the switch element string
Connection；
The switch element, specifically for controlling first resistance element to the absorption process of the surging signal.
4. drive control circuit according to claim 3, which is characterized in that the resistive absorbing circuit further include:
Arresting element, for discharging the peak voltage of first resistance element, the arresting element with described first resistive yuan
Part is in parallel.
5. drive control circuit according to claim 2, which is characterized in that the capacitive absorbing circuit includes:
First capacitive element, for absorbing the surging signal in the two buss lines, first capacitive element and described unidirectional
Breakover element series connection；
Second resistance element, for discharging the surging signal in first capacitive element, second resistance element with it is described
First capacitive element is in parallel.
6. drive control circuit according to claim 5, which is characterized in that the capacitive absorbing circuit includes:
Second capacitive element, for absorbing the surging signal in the two buss lines, second capacitive element and described first
Capacitive element series connection；
Third resistance element, for discharging the surging signal in second capacitive element, the third resistance element with it is described
Second capacitive element is in parallel.
7. drive control circuit according to claim 6, which is characterized in that further include:
4th resistance element, for limiting the electric current for flowing through the capacitive absorbing circuit, the 4th resistance element is connected on institute
State the branch where capacitive absorbing circuit and the one-way conduction element.
8. drive control circuit according to any one of claim 1 to 7, which is characterized in that the control chip is specific
For:
In the case where being more than or equal to the first preset threshold based on the busbar voltage, the default pulse-width signal is exported
To the switch element；
Based on the busbar voltage less than the second preset threshold in the case where, stop exporting the default pulse-width signal；
Wherein, first preset threshold is greater than second preset threshold.
9. drive control circuit according to claim 8, which is characterized in that the drive control circuit further include:
Rectification circuit, output is the bus signal, the bus signal after the rectification circuit rectifies AC signal
It exports through the high voltage bus and the low-voltage bus bar to the bus capacitor, the inverter bridge and the load,
Wherein, the control chip controls the on state of the switch element according to the AC signal.
10. drive control circuit according to claim 8, which is characterized in that further include:
Comparison circuit, for exporting corresponding level signal to the control chip according to the busbar voltage, the comparison is electric
The input terminal on road is connected with the output end of the sample circuit, and the output end of the comparison circuit is connected with the control chip
It connects；
The control chip is also used to determine whether to export according to the level signal the default pulse-width signal to described
Switch element.
11. drive control circuit according to claim 10, which is characterized in that
The comparison circuit is specifically used for: in the case where being greater than or equal to third predetermined threshold value based on the busbar voltage, output
First level signal；And second electrical level is exported less than or equal in the case where the 4th preset threshold based on the busbar voltage
Signal；
The control chip is specifically used for: receiving first level signal or is switching to first by the second electrical level signal
In the case where the energizing signal of level signal, the default pulse-width signal is exported to the switch element；
The third predetermined threshold value is greater than the 4th preset threshold, and the 4th preset threshold is greater than the described first default threshold
Value.
12. a kind of air conditioner, which is characterized in that the air conditioner includes:
Motor；
Drive control circuit as described in any one of claims 1 to 11, the signal input part of the motor are connected to described
Drive control circuit, the driving signal of the drive control circuit output is for driving the motor operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019100417084 | 2019-01-16 | ||
| CN201910041708 | 2019-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910448284.3A Pending CN110112899A (en) | 2019-01-16 | 2019-05-27 | Drive control circuit and air conditioner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049118A (en) * | 2020-01-07 | 2020-04-21 | 珠海格力电器股份有限公司 | Overvoltage protection device and method for power utilization circuit and circuit with overvoltage protection |
| CN112072904A (en) * | 2020-08-28 | 2020-12-11 | 珠海格力电器股份有限公司 | Direct-current bus protection device, electrical equipment and direct-current bus protection method thereof |
| CN112303707A (en) * | 2020-10-15 | 2021-02-02 | 青岛海信日立空调系统有限公司 | Air conditioner and voltage control method |
| CN112350292A (en) * | 2020-11-02 | 2021-02-09 | 北京航天发射技术研究所 | Reverse irrigation energy absorption circuit and control method |
-
2019
- 2019-05-27 CN CN201910448284.3A patent/CN110112899A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049118A (en) * | 2020-01-07 | 2020-04-21 | 珠海格力电器股份有限公司 | Overvoltage protection device and method for power utilization circuit and circuit with overvoltage protection |
| CN112072904A (en) * | 2020-08-28 | 2020-12-11 | 珠海格力电器股份有限公司 | Direct-current bus protection device, electrical equipment and direct-current bus protection method thereof |
| CN112303707A (en) * | 2020-10-15 | 2021-02-02 | 青岛海信日立空调系统有限公司 | Air conditioner and voltage control method |
| CN112303707B (en) * | 2020-10-15 | 2023-12-12 | 青岛海信日立空调系统有限公司 | Air conditioner and voltage control method |
| CN112350292A (en) * | 2020-11-02 | 2021-02-09 | 北京航天发射技术研究所 | Reverse irrigation energy absorption circuit and control method |
| CN112350292B (en) * | 2020-11-02 | 2023-03-28 | 北京航天发射技术研究所 | Reverse irrigation energy absorption circuit and control method |
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