CN110071626A - Drive control circuit and air conditioner - Google Patents
Drive control circuit and air conditioner Download PDFInfo
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- CN110071626A CN110071626A CN201910447809.1A CN201910447809A CN110071626A CN 110071626 A CN110071626 A CN 110071626A CN 201910447809 A CN201910447809 A CN 201910447809A CN 110071626 A CN110071626 A CN 110071626A
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Classifications
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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
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Abstract
The invention proposes a kind of drive control circuits and a kind of air conditioner, wherein, drive control circuit includes: the first resistance element, switch element and flow element, switch element is configured as the surging signal on control the first resistance element absorption high voltage bus, flow element is for measuring the current signal for flowing through the first resistance element, and access is between high voltage bus and low-voltage bus bar after the first resistance element, switch element and flow element series connection；Chip is controlled, for detecting and confirming that current signal is greater than predetermined current threshold, stops driving switch element, so that the first resistance element stops absorbing surging signal, reduces a possibility that component in drive control circuit leads to damage because of overcurrent.
Description
This application claims on 01 16th, 2019 submission Patent Office of the People's Republic of China, application No. is 201910041269.7, invention
This is hereby incorporated by reference in the priority of the Chinese patent application of entitled " drive control circuit and air conditioner ", entire contents
In application.
Technical field
The present invention relates to field of circuit technology, in particular to a kind of drive control circuit and a kind of air conditioner.
Background technique
Such as compressor, motor, engine threephase load equipment use AC-DC-exchange topological structure, specifically,
AC-DC-exchange topological structure is as shown in Figure 1, comprising: AC power supply module, power filtering module, rectification module, filtering
Module, inverter module and load.
Power frequency component after needing to filter smooth stream due to filter module, so often being made using the electrolytic capacitor of larger capacity
For main filter element.However, the use of electrolytic capacitor will cause THD (the Total Harmonic of input AC electric current
Distortion, total harmonic distortion) increase, and the service life shorter ultimate life for influencing controller of itself, furthermore electrolytic capacitor
Fever reduce controller efficiency.
With the promotion of cost and reliability requirement, electrolytic capacitor capacity reduction even no electrolytic capacitor control program is gradually
It is mature.For no electrolytic capacitor control program, electrolytic capacitor is generally replaced using a thin-film capacitor compared with low capacity.Due to mother
The reduction of line capacitance capacity is deteriorated for the absorbability of surge, and defect is mainly reflected in following two aspect:
One, thin-film capacitor or small electric solution capacitor are limited for surge absoption, lead to the first device of the excessively high damage of busbar voltage
Part.
Two, thin-film capacitor or small electric solution capacitor are limited for surge absoption, if input wave when model machine operates normally
Voltage is gushed, leads to busbar voltage moment acute variation, influences control stability.
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, first aspect of the present invention is to propose a kind of drive control circuit.
The second aspect of the invention is to propose a kind of air conditioner.
In view of this, according to the first aspect of the invention, proposing a kind of drive control circuit, comprising: inverter bridge, it is inverse
Become the load running of bridge drive control, run with driving motor, inverter bridge accesses between high voltage bus and low-voltage bus bar；Bus electricity
Hold, bus capacitor powers on required starting voltage for providing load, and bus capacitor is also used to absorb surging signal, bus capacitor
It accesses in the two buss lines of inverter bridge input side；Reactor, for absorb drive control circuit driving load running during
The surging signal of generation, reactor access between power grid and load, sample circuit, and the voltage for acquiring high voltage bus is believed
Number, further includes: the first resistance element, switch element and flow element, switch element are configured as the first resistance element of control
The surging signal on high voltage bus is absorbed, for flow element for measuring the current signal for flowing through the first resistance element, first is resistive
Access is between high voltage bus and low-voltage bus bar after element, switch element and flow element series connection；Chip is controlled, for detecting
And confirm that current signal is greater than predetermined current threshold, stop driving switch element, so that the first resistance element stops absorbing surge
Signal.
The drive control circuit of embodiment according to the present invention is the motor for being driven by inverter bridge, wherein driving
Control circuit includes: inverter bridge, bus capacitor, reactor, control chip and the first resistance element, switch element and flow measurement member
Part.Wherein inverter bridge controls motor operation to motor output drive signal, due to the surging signal that is formed on high voltage bus without
Method ensures to fully absorb, and therefore, the first resistance element and switch element is concatenated between high voltage bus and low-voltage bus bar, and be arranged
The flow element of electric current in the first resistance element and switch element circuit is sampled, it is big in the current signal for flowing through the first resistance element
In or be equal to predetermined current threshold in the case where, control chip stop driving switch element so that the first resistance element stop inhale
Surging signal is received, under the premise of increasing the surge absoption ability of drive control circuit, reduces first device in drive control circuit
Part leads to a possibility that damage because of overcurrent.
Drive control circuit according to the abovementioned embodiments of the present invention can also have following technical characteristic:
In any of the above-described technical solution, further, control chip is also used to: being detected and is confirmed the first resistance element
It absorbs power and is greater than predetermined power threshold value, stop driving switch element, so that the first resistance element stops absorbing surging signal.
In the technical scheme, by the way that the absorption power of the first resistance element to be compared with predetermined power threshold value,
Power is absorbed greater than in the case where predetermined power threshold value, is stopped driving switch element, is reduced the component in drive control circuit
Lead to a possibility that damaging because absorption power is excessively high.
In any of the above-described technical solution, further, control chip is also used to: detecting and confirm the voltage of high voltage bus
Signal stops driving switch element less than the first preset threshold, so that the first resistance element stops absorbing surging signal；And inspection
It surveys and confirms that the voltage signal of high voltage bus is greater than or equal to the second preset threshold, control switch element is according to preset specified load
Wave frequency rate or preset specified turn-on time or preset specified duty ratio operation, so that the first resistance element absorbs surge letter
Number.
Optionally, designated carrier frequency, specified turn-on time and specified duty ratio are maximum value.
In the technical scheme, by the voltage signal of the first preset threshold and high voltage bus the step of being compared,
In the case where voltage signal is less than the first preset threshold, stop driving switch element, and then avoids inputting model in normal voltage
The first resistance element access high voltage bus, extends the service life of the first resistance element in enclosing, otherwise control switch element is according to pre-
If minimum carrier frequency (fixed duty cycle) or preset maximum turn-on time or preset maximum duty cycle (fixed carrier frequency
Rate) operation, and then realize the quick absorption of surging signal, wherein the first preset threshold is less than the second preset threshold.
In any of the above-described technical solution, further, drive control circuit further include: the first capacitive element, first holds
Property element be used to absorb surging signal on high voltage bus, the first capacitive element is serially connected between high voltage bus and low-voltage bus bar.
In the technical scheme, by concatenating a capacitive element between high voltage bus and low-voltage bus bar, using additional
The capacitive element of setting absorbs the surging signal on high voltage bus, and then improves the surge absoption ability of drive control circuit,
It reduces in drive control circuit because component damage caused by surging signal, improves the reliability of circuit.
In any of the above-described technical solution, further, drive control circuit further include: one-way conduction element is unidirectionally led
Logical element is configured as the surging signal on control the first capacitive element absorption high voltage bus, the first capacitive element and one-way conduction
Element series connection；Or one-way conduction element is configured as the first capacitive element of control and/or the first resistance element absorbs high voltage bus
On surging signal, one-way conduction element connects with the first capacitive element, the first resistance element, switch element and flow element
It is connected by one-way conduction element with high voltage bus.
In the technical scheme, by the way that one-way conduction element is arranged, only in the case where one-way conduction element meets turn-on condition,
The surging signal on the first capacitive element and/or the first resistance element absorption high voltage bus could be passed through, avoid the first capacitive first
Part comes as bus capacitor using and then improving the service life of the first capacitive element, similarly, also improve first resistive yuan
The service life of part, and then improve the surge absoption ability of drive control circuit, wherein one-way conduction element is that have unidirectionally to lead
The element of logical characteristic, diode etc..
In any of the above-described technical solution, further, drive control circuit further include: the second resistance element, the second resistance
Property element be used to discharge surging signal in the first capacitive element, the second resistance element is in parallel with the first capacitive element.
In the technical scheme, after the surging signal that the first capacitive element absorbs on high voltage bus, setting and the is utilized
Second resistance element of one capacitive element parallel connection discharges the surging signal in the first capacitive element, the setting of the second resistance element
Improve the reliability of drive control circuit.
Comparison circuit, for detecting and confirming that the voltage signal of high voltage bus is more than or equal to or is greater than third predetermined threshold value,
Comparator output level energizing signal is capable of the port of trigger control chip, and control chip can be cut according to comparator output signal
Change to switch control signal, to change absorption of first resistance element to surge energy, comparison circuit respectively with sample circuit and
Control chip is connected.
In any of the above-described technical solution, further, drive control circuit further include: comparison circuit, for detecting simultaneously
Confirm that the voltage signal of high voltage bus is greater than or equal to third predetermined threshold value, comparison circuit output level energizing signal can trigger
The port of chip is controlled, control chip switches the control signal of switch element according to level energizing signal, resistive to change first
Absorption of the element to surge energy, comparison circuit are connected with sample circuit and control chip respectively.
In the technical scheme, by the way that comparison circuit is arranged, it is more than or equal to or is greater than the in the voltage signal of high voltage bus
In the case where three preset thresholds, the port of comparator output level energizing signal trigger control chip, control chip can basis
Comparator output signal switching is to switch control signal, to change absorption of first resistance element to surge energy；In high pressure mother
In the case that the voltage signal of line is less than the 4th preset threshold, stop the port of trigger control chip, stops using first resistive
Absorption of the element to surging signal.Preferably, the interruptive port of comparison circuit trigger control chip belongs to hardware trigger, with software
Triggering is compared, response speed block, and then reduces the possibility that drive control circuit breaks down, and wherein third predetermined threshold value is greater than the
Four preset thresholds.
Optionally, comparison circuit is also used to detect and confirm that the voltage signal of high voltage bus is greater than or equal to the 4th default threshold
In the case where value, comparison circuit output level energizing signal gives control chip, and control chip switches the control signal of switch element,
Wherein the 4th preset threshold is less than third predetermined threshold value and is greater than the first preset threshold.
In any of the above-described technical solution, further, further includes: the second capacitive element, for absorbing high voltage bus
Surging signal, the second capacitive element connects with the first capacitive element.
In the technical scheme, in order to adapt to high voltage bus, when the voltage of high voltage bus is larger, in the first capacitive element
On the basis of connect the second capacitive element, to improve the absorbability of the surging signal of high voltage bus.
In any of the above-described technical solution, further, further includes: third resistance element, third resistance element is for releasing
The surging signal in the second capacitive element is put, third resistance element is in parallel with the second capacitive element.
In the technical scheme, in the case where the second capacitive element is arranged, by the way that third resistance element and second is arranged
Resistance element is used cooperatively, the voltage of the first capacitive element of Lai Pingheng and the second capacitive element both ends, while third resistance element
It is also used to discharge the surging signal on the second capacitive element, to improve the reliability of drive control circuit.
In any of the above-described technical solution, further, the 4th resistance element, for limit flow through the first capacitive element,
The electric current of at least one element in second capacitive element and/or the first resistance element；4th resistance element, the first capacitive element with
And it is accessed between high voltage bus and low-voltage bus bar after the series connection of one-way conduction element；Or the 4th resistance element, the first capacitive element,
Access is between high voltage bus and low-voltage bus bar after second capacitive element and the series connection of one-way conduction element；Or one-way conduction element
After connecting with the 4th resistance element by the first capacitive element and/or the second capacitive element and by the first resistance element, open
Close element, flow element is serially connected between high voltage bus and low-voltage bus bar.
In the technical scheme, the setting of the 4th resistance element limits the electric current flowed through in circuit, avoids the occurrence of
The excessive situation of immediate current, in turn results in component damage, improves the reliability of drive control circuit, while the 4th resistive yuan
Part also act as absorb surging signal in circuit effect, and then improve the absorption energy of the surging signal of drive control circuit
Power.
In any of the above-described technical solution, further, flow element is Hall sensor or resistance element.
In the technical scheme, Hall sensor manufacturing process is mature, low in cost.
In any of the above-described technical solution, further, bus capacitor is thin-film capacitor.
In any of the above-described technical solution, further, further includes: rectification circuit, rectification circuit carry out AC signal
Output is the voltage signal of high voltage bus after rectification.
According to the second aspect of the invention, a kind of air conditioner is proposed, comprising: motor；And such as any of the above-described technology
Drive control circuit described in scheme, the signal input part of the motor are connected to the drive control circuit, the driving control
The driving signal of circuit output processed is for driving the motor operation.Therefore the air conditioner has described in any of the above-described embodiment
Whole beneficial effects of drive control circuit, details are not described herein.
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 AC-DC-exchange topological structure in the prior art；
Fig. 2 shows a kind of drive control circuit schematic diagrames；
Fig. 3 shows the drive control circuit schematic diagram of one embodiment of the present of invention；
Fig. 4 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 5 shows the drive control circuit schematic diagram of yet another embodiment of the present invention；
Fig. 6 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 7 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 8 shows the drive control circuit schematic diagram of another embodiment of the invention；
Fig. 9 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 10 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 11 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 12 shows the drive control circuit schematic diagram of another embodiment of the invention；
Figure 13 shows the drive control circuit schematic diagram of another embodiment of the invention；
The surging signal that Figure 14 shows one embodiment of the present of invention absorbs schematic diagram；
Figure 15 shows the sampling schematic diagram of one embodiment of the present of invention；
The surging signal that Figure 16 shows another embodiment of the invention absorbs schematic diagram；
Figure 17 shows the sampling schematic diagrames of another embodiment of the invention；
Figure 18 shows the control schematic diagram of one embodiment of the present of invention；
Figure 19 shows transient absorption power and duration relation schematic diagram in the embodiment of the present invention.
Wherein, the corresponding relationship between appended drawing reference and component names of the Fig. 2 into Figure 13 are as follows:
102 inverter bridges, 104 switch elements, 106 comparison circuits, 108 control chips, 110 arresting elements, 112 flow measurements member
Part, 114 rectification circuits.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage
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 limited to following public affairs
The limitation for the specific embodiment opened.
The embodiment of first aspect present invention proposes a kind of drive control circuit, as shown in Fig. 2, drive control circuit packet
Include: inverter bridge 102,102 drive control load running of inverter bridge are run with driving motor, and inverter bridge 102 is accessed in high voltage bus
Between low-voltage bus bar；Bus capacitor C1, bus capacitor C1Required starting voltage, bus capacitor C are powered on for providing load1
It is also used to absorb surging signal, bus capacitor C1It accesses in the two buss lines of 102 input side of inverter bridge；Reactor Ldc, is used for
The surging signal generated during absorption drive control circuit driving load running, reactor Ldc access is in power grid and load
Between, sample circuit, for acquiring the voltage signal of high voltage bus；First resistance element R1, switch element 104 and flow element
112, switch element 104 is configured as the first resistance element R of control1Absorb the surging signal on high voltage bus, flow element 112
The first resistance element R is flowed through for measuring1Current signal, the first resistance element R1, switch element 104 and flow element 112
Access is between high voltage bus and low-voltage bus bar after series connection；Chip 108 is controlled, for detecting and confirming that it is default that current signal is greater than
In the case where current threshold, stop driving switch element 104, so that the first resistance element R1Stop absorbing surging signal.
The drive control circuit of embodiment according to the present invention is the motor for being driven by inverter bridge, wherein driving
Control circuit includes: inverter bridge 102, bus capacitor C1, reactor Ldc, control chip 108 and the first resistance element R1, switch
Element 104 and flow element 112.Wherein inverter bridge 102 controls motor operation, due in high pressure to motor output drive signal
The surging signal formed on bus, which is unable to ensure, to be fully absorbed, and therefore, the first resistance is concatenated between high voltage bus and low-voltage bus bar
Property element R1With switch element 104, while be arranged determine sampling the first resistance element R1With the flow measurement of electric current in switch element 104
Element 112 is flowing through the first resistance element R1Current signal be greater than or equal to predetermined current threshold in the case where, control chip
Stop driving switch element 104, so that the first resistance element R1Stop absorbing surging signal, in the wave for increasing drive control circuit
Under the premise of gushing absorbability, a possibility that component in drive control circuit leads to damage because of overcurrent is reduced.
Wherein, the cut-off current and/or the first resistance element R of predetermined current threshold and switch element 1041Rated power
It is related.
In one embodiment of the invention, as shown in figure 12, control chip 108 is also used to: being detected and is confirmed the first resistance
Property element R1Absorption power be greater than predetermined power threshold value, stop driving switch element 104 so that the first resistance element R1Stop
Absorb surging signal.
In this embodiment, by by the first resistance element R1Absorption power be compared with predetermined power threshold value,
Power is absorbed greater than in the case where predetermined power threshold value, stops driving switch element 104, avoids component because absorbing power mistake
Height damages, wherein by the voltage value of bus and the computing the resistor value of the first resistance element, i.e. Vdc × Vdc/R is calculated in real time
The absorption power of absorption, wherein Vdc is busbar voltage, and R is the first resistance element R1Resistance value.
In one embodiment of the invention, as shown in Fig. 2, control chip 108 is also used to: detecting and confirm high voltage bus
Voltage signal less than the first preset threshold, stop driving switch element 104, so that the first resistance element R1Stop absorbing surge
Signal；And detect and confirm that the voltage signal of high voltage bus is greater than or equal to the second preset threshold, control switch element 104 is pressed
It is (fixed to carry according to preset designated carrier frequency (fixed duty cycle) or preset specified turn-on time or preset specified duty ratio
Wave frequency rate) operation, so that the first resistance element R1Absorb surging signal.
Optionally, designated carrier frequency, specified turn-on time and specified duty ratio are maximum value.
In this embodiment, by the voltage signal of the first preset threshold and high voltage bus the step of being compared,
In the case that voltage signal is less than the first preset threshold, stop driving switch element 104, and then avoids inputting model in normal voltage
First resistance element R in enclosing1High voltage bus is accessed, the first resistance element R is extended1Service life, otherwise control switch element 104
It is (fixed according to preset minimum carrier frequency (fixed duty cycle) or preset maximum turn-on time or preset maximum duty cycle
Carrier frequency) operation, and then realize the quick absorption of surging signal, wherein the first preset threshold is less than the second preset threshold.
Wherein, the first preset threshold and the second preset threshold are related to the voltage of high voltage bus.
In one embodiment of the invention, as shown in Fig. 2 to Fig. 9, drive control circuit further include: the first capacitive element
C2, the first capacitive element C2For absorbing the surging signal on high voltage bus, the first capacitive element C2It is serially connected in high voltage bus and low
It presses between bus.
In this embodiment, by concatenating a capacitive element between high voltage bus and low-voltage bus bar, using additionally setting
The capacitive element set absorbs the surging signal on high voltage bus, and then improves the surge absoption ability of drive control circuit, drop
Because component damage caused by surging signal, improves the reliability of circuit in low drive control circuit.
In one embodiment of the invention, as shown in Fig. 2 to Fig. 9, drive control circuit further include:
One-way conduction element D1, one-way conduction element D1It is configured as the first capacitive element C of limitation2It absorbs on high voltage bus
Surging signal, the first capacitive element C2With one-way conduction element D1Series connection；Or one-way conduction element D1It is configured as control first
Capacitive element C2And/or the first resistance element R1Absorb the surging signal on high voltage bus, one-way conduction element D1With the first capacitive
Element C2Series connection, the first resistance element R1, switch element 104 and flow element 112 pass through one-way conduction element D1With high pressure mother
Line is connected.
In this embodiment, by the way that one-way conduction element is arranged, only in one-way conduction element D1Meet under turn-on condition,
The first capacitive element C could be passed through2And/or the first resistance element R1The surging signal on high voltage bus is absorbed to absorb high pressure mother
Surging signal on line avoids the first capacitive element C2Come as bus capacitor using and then improving the first capacitive element C2's
Service life similarly also improves the first resistance element R1Service life, and then improve drive control circuit surge absoption
Ability, specifically, one-way conduction element D1Anode be connected with high voltage bus, one-way conduction element D1Cathode via first
Capacitive element C2It is connected with low-voltage bus bar, wherein one-way conduction element D1It is the element with one-way conduction characteristic, such as two
Pole pipe etc..
In one embodiment of the invention, as shown in Fig. 2 to Fig. 9, drive control circuit further include: the second resistance element
R2, the second resistance element R2For discharging the first capacitive element C2In surging signal, the second resistance element R2With the first capacitive member
Part C2It is in parallel.
In this embodiment, in the first capacitive element C2After absorbing the surging signal on high voltage bus, setting and the is utilized
One capacitive element C2Second resistance element R in parallel2To discharge the first capacitive element C2In surging signal, the second resistance element
R2Setting improve the reliability of drive control circuit.
In one embodiment of the invention, further, as shown in Fig. 2, drive control circuit further include: comparison circuit
106, for detecting and confirming that the voltage signal of high voltage bus is greater than or equal to third predetermined threshold value, comparison circuit 106 exports electricity
The port of flat energizing signal trigger control chip 108, control chip 108 switch switch element 104 according to level energizing signal
Signal is controlled, to change the first resistance element R1Absorption to surge energy, it is more electric to reduce the output power of high voltage bus
Road is connected with sample circuit and control chip 108 respectively.
In this embodiment, by the way that comparison circuit 106 is arranged, it is pre- to be greater than or equal to third in the voltage signal of high voltage bus
If in the case where threshold value, the port of 106 output level energizing signal trigger control chip 108 of comparison circuit controls chip 108
According to the control signal of level energizing signal switching switch element 104, to change absorption of the first resistance element R1 to surge energy,
To reduce the output power of high voltage bus, surging signal is reduced by reducing the output power of bus；In the electricity of high voltage bus
In the case that pressure signal is less than or is less than or equal to the 4th preset threshold, stops the interruptive port of trigger control chip, stop using
Absorption of first resistance element to surging signal.Preferably, the interruptive port of comparison circuit trigger control chip belongs to hardware touching
Hair, compared with software triggering, fast response time, and then reduce the possibility that drive control circuit breaks down, wherein third is default
Threshold value is greater than the 4th preset threshold, and further, the 4th preset threshold is greater than the first preset threshold, third predetermined threshold value and high pressure
The voltage of bus is related, and the 4th preset threshold is related to the voltage of high voltage bus.
Optionally, it is pre- to be also used to detect and confirm that the voltage signal of high voltage bus is greater than or equal to the 4th for comparison circuit 106
If in the case where threshold value, 106 output level energizing signal of comparison circuit gives control chip 108, the control switching switch member of chip 108
The control signal of part 104, wherein the 4th preset threshold is less than third predetermined threshold value and is greater than the first preset threshold.
In one embodiment of the invention, further, as shown in Fig. 2 to Fig. 9, further includes: the second capacitive element C3,
For absorbing the surging signal on high voltage bus, the second capacitive element C3With the first capacitive element C2Series connection.
In this embodiment, in order to adapt to high voltage bus, when the voltage of high voltage bus is larger, in the first capacitive element C2
On the basis of connect the second capacitive element C3, to improve the absorbability of the surging signal of high voltage bus.
In one embodiment of the invention, further, as shown in Fig. 2 to Fig. 9, further includes: third resistance element R3,
Third resistance element R3For discharging the second capacitive element C3Middle surging signal, third resistance element R3With the second capacitive element C3
It is in parallel.
In this embodiment, the second capacitive element C is being set3In the case where, by the way that third resistance element R is arranged3With second
Resistance element R2It is used cooperatively, the first capacitive element of Lai Pingheng C2With the second capacitive element C3The voltage at both ends, while third is resistive
Element R3It is also used to the second capacitive element C2On surging signal discharged, to improve the reliability of drive control circuit.
In one embodiment of the invention, as shown in Fig. 2 to Fig. 9, further, further includes: the 4th resistance element is used
The first capacitive element, the second capacitive element and/or the first resistance element R are flowed through in limitation1In at least one element electric current；The
Four resistance element R4, the first capacitive element C is flowed through for limiting2And/or the second capacitive element C3Electric current；4th resistance element
R4, the first capacitive element C2And it is accessed between high voltage bus and low-voltage bus bar after the series connection of one-way conduction element；Or the 4th resistive yuan
Part R4, the first capacitive element C2, the second capacitive element C3With access after the series connection of one-way conduction element in high voltage bus and low-voltage bus bar
Between；Or one-way conduction element D1With the 4th resistance element R4Pass through the first capacitive element C after series connection2And/or second capacitive element
C3And pass through the first resistance element R1, switch element 104, flow element 112 be serially connected between high voltage bus and low-voltage bus bar.
In this embodiment, the 4th resistance element R4Setting limit the electric current flowed through in circuit, avoid the occurrence of
The excessive situation of immediate current, in turn results in component damage, improves the reliability of drive control circuit, while the 4th resistive yuan
Part R4Also act as absorb surging signal in circuit effect, and then improve the absorption of the surging signal of drive control circuit
Ability.
In any of the above-described embodiment, flow element 112 is Hall sensor or resistance element.
Wherein, Hall sensor manufacturing process is mature, low in cost.
In one embodiment of the invention, same after the rectified circuit 114 of input voltage as shown in Fig. 2, when model machine powers on
When give bus capacitor C1With the first capacitive element C2With the second capacitive element C3Charging, at this time if input voltage is normally being set
In range (150V~264V), (hardware protection voltage threshold Vref is set as 800V, software protection threshold value is when being less than 294V
720V, corresponding exchange input virtual value is 720/1.414/1.732), model machine works normally, the first resistance element R1Switch
Element 104 is not turned on.After charging, the first resistance element R1Both end voltage is stablized in Vdc-max value (i.e. the first resistance element
R1Both end voltage stablizes the maximum value Vdc-max in busbar voltage, or variation is slowly), further, as shown in figure 9, flow measurement
112 sampled current signals of element can be by measuring the first resistance element R1The voltage at both ends and the first resistance element R1Ratio
It obtains.
When model machine operates normally, bus capacitor C1Upper voltage with alternating current input power supplying frequency multiplied by 6 frequency fluctuation, normally
Busbar voltage maximum value is 264 × 1.414 × 1.732=646V when operation, and much smaller than the protection threshold value of setting, therefore first hinders
Property element R1Switch element 104 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, due to the bus capacitor C of low capacity1(thin-film capacitor or low capacity electrolysis electricity
Hold) absorb surge capacity it is limited, busbar voltage can rapid increase, when DC bus-bar voltage be higher than set threshold voltage V2 (herein
It is set as 720V, practical adjustable) when, busbar voltage of the DC bus-bar voltage through divider resistance R6 and R7, after being divided
Into control chip 108 (MCU, micro controller unit micro-control unit) AD mouth (into the sampled signal of MCU
For the input terminal of Vdc) and comparator.When busbar voltage after partial pressure is greater than the given threshold of comparison circuit 106, comparison circuit
106 (comparators) output becomes low level from high level, and level translation signal enters the external interrupt mouth of MCU, using comparator
The advantage of the level translation signal of output is that reaction speed is sufficiently fast, and is not interfered by software.It can also be in control chip 108
One fixed high frequency disruptions is set inside software, for example interruption frequency is 40K, and DC bus electricity is sampled in the interrupt routine
Pressure, and judge whether to be more than given threshold according to the sampled value.
As shown in Figure 14 to Figure 19, it is judged as that current busbar voltage is more than 720V when MCU receives external interrupt signal, presses
Contracting machine starts downrating or shutdown, as shown in figure 16, MCU start to export using 40K as the modulation of the pulse width of carrier frequency (by
It is 120K in the bandwidth of Hall sensor, and sampling time delay is there are 8us, therefore pulse width modulated duty cycle limitation is minimum
60%, if selecting smaller carrier frequency, corresponding duty ratio can be further decreased) or as shown in figure 14, pulse signal (with
Fixed cycle such as 40K sample) control absorption resistance switch element.If it is pulse width modulation control, as shown in figure 17,
The midpoint sample rate current of the conducting of each pulse width modulation, if it is pulse control signal, as shown in figure 15, then with fixation
Sampling period sample rate current.
Controlled if it is pulse width modulated duty cycle, by the electric current Isample sampled every time, be superimposed Isample ×
(wherein, R is the resistance value of corresponding resistance element to Isample × R × duty × T, and duty is pulse width modulated duty cycle, and T is
The period of pulse width modulation, what above-mentioned formula was calculated be each time switching elements conductive when the energy that absorbs) obtain
The gross energy ∑ E of absorption, if meeting formula ∑ E≤0.7 × 5, (5 be the rated power 5W of single resistance, and 0.7 is safety system
Number) then continue to output；If it is pulse control, by the electric current Isample sampled every time, be superimposed Isample × Isample ×
R × △ t (△ t is the current sample period) obtains the gross energy ∑ E absorbed, continues if meeting formula ∑ E≤0.7 × 5 defeated
Out.
Further, since drive control circuit has sampling functions, therefore the sample rate current of the first resistance element can be obtained
(since overcurrent of the IGBT in 1ms itself is greater than rated current, judge that overcurrent closes the delay of output most from sampling
Greatly a sampling period, can protect in time), when protection threshold value of the actual samples electric current greater than setting, directly turn off first
Resistance element R1Switch element.
Specifically, due to the first resistance element R1Intervention, busbar voltage can rapid decrease, when be lower than some fixed threshold
(such as 700V) or be unsatisfactory for formula ∑ E≤0.7 × 5 (if sample rate current always normally be no more than given threshold) when, MCU control
First resistance element R1Switch element 104 disconnect, the first resistance element R1No longer work, wherein 0.7 is safety coefficient, it can
To be modified according to circuit, while formula ∑ E≤0.7 × 5 can also be bent by the absorption power and the relationship of time of resistance
Line judgement, such as the curve form of Figure 16, such as the first resistance element R1If being selected as 0.1 Europe~24 Europe, pulse absorbs in 1ms
Energy can be limited to 80000W × 1ms=80J.
By controlling the first resistance element R1Always with the maximum instantaneous power control switch element 104 of permission, reach most
The purpose of fast speed absorption surge.
It is worth noting that the selection of carrier frequency and duty ratio depends mainly on the threshold value V2 that works of setting, first resistive
Element R1Resistance value, the first resistance element R1Rated power and momentary overload capacity (resistance specification gathering of calligraphers embodiment), it is general come
It says, the first resistance element R1Its bigger momentary overload capacity of rated power it is also bigger, can therefore under identical threshold value V2
It is bigger with the duty ratio opened or carrier frequency is smaller (i.e. the period is bigger).
Specifically, duty ratio is given by formula, for example (Vdc-filter is that real-time detection is female to (Vdc-filter/V2) × T
The voltage value that line voltage obtains after filtering), while increasing duty-cycle limit link, the busbar voltage the big, the duty exported
Than bigger, high busbar voltage high duty ratio can quickly absorb surge energy；Also remainder formula can be used, as busbar voltage is got over
The duty ratio exported greatly is smaller, guarantees the reliability etc. of absorption resistance.
About the threshold voltage (being set as fixed 720V and 700V herein) of conducting, the value that can be floating (for example is examined
(Vdc-max is the busbar voltage of several detection cycles before detecting to Vdc-max value before surveying on several detection cycles (such as 100ms)
Maximum value), and using the value add deltaV1 as switch element turn off voltage threshold, (wherein, with Vdc-max+ △ V1+20V
DeltaV1 is the float value of voltage, is configured according to the degrees of tolerance of the component damage of drive control circuit, and 20V can be with
It is other values) it is used as 104 conducting voltage threshold value of switch element.It is, of course, also possible to the peak value for detection exchange input be expanded, to hand over
Peak value Vac-max+ △ V1 is as switching elements conductive voltage threshold for stream input, (can be other with Vdc-max+ △ V1+20V
Value) it is used as switching elements conductive voltage threshold.
Over-voltage and the judgement for exiting over-voltage are currently to generate level conversion compared with given threshold by hardware comparator to sentence
Break as over-voltage, software real-time detection busbar voltage (Vdc-filter) after filtering is set as exiting over-voltage lower than some value；
It over-voltage and exits over-voltage and is all given by hardware hysteresis comparator.
As shown in Figure 10 to Figure 13, R5For system damping resistance (be not more than 200 Europe), if it is no harmonic requirement region,
The preferred small inductor of Ldc (for cost reasons), if selection small inductor, best matching system damping resistance, lifting system are stablized
Property.
First resistance element R1Resistance value and setting busbar voltage protect threshold value, the overcurrent capability of switch element 104
It is related.
4th resistance element R4And the first capacitive element C2Selection and the first resistance element R1Inductance it is related, if
First resistance element R1It is noninductive resistance, then can use the 4th resistance element R4, the first capacitive element C2And arresting element
110 (as shown in figure 13).
The selection of arresting element 110 (anti-paralleled diode) is related to the inductance of the first resistance element R1 and resistance value.
In any of the above-described embodiment, further, bus capacitor C1For thin-film capacitor.
In an embodiment of the invention, as shown in Fig. 2, 114 rectification circuit of rectification circuit, 114 pairs of rectification circuit exchanges
Output is the voltage signal of high voltage bus after signal is rectified, and sample circuit is specifically used for the friendship before acquisition rectification circuit 114
It is inverse after voltage signal and/or reactor Ldc after stream power input peak voltage signal and/or rectification circuit 114 before reactor
Voltage signal before becoming bridge 102.
In this embodiment, sample circuit is specifically used for the AC power source V before acquisition rectification circuit 114ACInput peak value electricity
Electricity after voltage signal and/or reactor Ldc after pressure signal and/or rectification circuit 114 before reactor Ldc before inverter bridge 102
Press signal.
Optionally, drive control circuit includes power filtering module, and power filtering module is serially connected with AC power source and rectification
Between circuit 114, sample circuit be specifically used for acquisition power filtering module before AC power source input peak voltage signal and/
Or the voltage signal after power filtering module before rectification circuit 114.
In one particular embodiment of the present invention, the capacitance of thin-film capacitor is lower than default capacitance, wherein default capacitance is pressed
It is calculated according to following calculation formula:
Wherein, CdcFor preset capacity, LSIt is the total inductance value of equivalent drive control circuit DC side, PLIt is drive control electricity
The bearing power on road, RSFor the all-in resistance of equivalent drive control circuit DC side, vdc0For busbar voltage average value, for example, with 7P
For model machine, C can be determined according to the calculation formuladc840uF is had to be larger than, preset capacity is 840uF or more, is being embodied
When be 1230uF.
The embodiment of second aspect of the present invention proposes a kind of air conditioner, comprising: motor；And such as any of the above-described technical side
Drive control circuit described in case, the signal input part of motor are connected to drive control circuit, the drive of drive control circuit output
Dynamic signal is for driving the motor operation.Therefore the air conditioner has drive control circuit described in any of the above-described embodiment
Whole beneficial effects, details are not described herein.
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.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of drive control circuit, comprising: inverter bridge, the inverter bridge drive control load running, the inverter bridge access
Between high voltage bus and low-voltage bus bar characterized by comprising
Reactor drives the surging signal generated during the load running for absorbing the drive control circuit, described
Reactor accesses between power grid and the load；
Bus capacitor, the bus capacitor are used to provide the described load and power on required starting voltage, and the bus capacitor is also used
In absorbing the surging signal, the bus capacitor access is in the two buss lines of inverter bridge input side；
Sample circuit, for acquiring the voltage signal of the high voltage bus；
First resistance element, switch element and flow element, the switch element are configured as controlling described first resistive yuan
Part absorbs the surging signal on the high voltage bus, and the flow element is for measuring the electric current for flowing through first resistance element
Signal, after first resistance element, the switch element and the flow element series connection access in the high voltage bus and
Between the low-voltage bus bar；
Chip is controlled, for detecting and confirming that the current signal is greater than predetermined current threshold, stopping drives the switch element,
So that first resistance element stops absorbing the surging signal, the control chip respectively with the sample circuit and described
Flow element is connected.
2. drive control circuit according to claim 1, which is characterized in that the control chip is also used to:
It detects and confirms that the absorption power of first resistance element is greater than the predetermined power threshold value, stop driving the switch
Element, so that first resistance element stops absorbing the surging signal.
3. drive control circuit according to claim 2, which is characterized in that the control chip is also used to:
It detects and confirms that the voltage signal of the high voltage bus less than the first preset threshold, stops driving the switch element, with
First resistance element is set to stop absorbing the surging signal；And
It detects and confirms that the voltage signal of the high voltage bus is greater than or equal to the second preset threshold, control the switch element and press
It is run according to preset specified duty ratio or preset specified turn-on time or preset designated carrier frequency, so that first resistance
Property element absorb the surging signal.
4. drive control circuit according to claim 1, which is characterized in that further include:
First capacitive element, first capacitive element are used to absorb the surging signal on the high voltage bus, and described first holds
Property element is serially connected between the high voltage bus and the low-voltage bus bar.
5. drive control circuit according to claim 4, which is characterized in that further include:
One-way conduction element, the one-way conduction element are configured as controlling the first capacitive element absorption high voltage bus
On surging signal, first capacitive element connects with the one-way conduction element；Or the one-way conduction element is configured
The surging signal on the high voltage bus is absorbed to control first capacitive element and/or first resistance element, it is described
One-way conduction element is connected with first capacitive element, first resistance element, the switch element and the flow measurement
Element is connected by the one-way conduction element with the high voltage bus.
6. drive control circuit according to claim 4, which is characterized in that further include:
Second resistance element, second resistance element are used to discharge surging signal in first capacitive element, and described the
Two resistance elements are in parallel with first capacitive element.
7. drive control circuit according to claim 3, which is characterized in that further include:
Comparison circuit compares for detecting and confirming that the voltage signal of the high voltage bus is greater than or equal to third predetermined threshold value
Circuit output level energizing signal can trigger the port of the control chip, and control chip is cut according to the level energizing signal
The control signal of the switch element is changed, it is described to adjust first resistance element to the infiltration rate of the surge energy
Comparison circuit is connected with the sample circuit and the control chip respectively.
8. drive control circuit according to claim 5, which is characterized in that further include:
Second capacitive element, for absorbing the surging signal on the high voltage bus, second capacitive element and described first
Capacitive element series connection.
9. drive control circuit according to claim 8, which is characterized in that further include:
Third resistance element, the third resistance element are used to discharge surging signal in second capacitive element, and described the
Three resistance elements are in parallel with second capacitive element.
10. drive control circuit according to claim 8, which is characterized in that further include:
4th resistance element flows through first capacitive element, second capacitive element and described first resistive for limiting
The electric current of at least one element in element；
Access is in the high pressure after 4th resistance element, first capacitive element and one-way conduction element series connection
Between bus and the low-voltage bus bar；Or the 4th resistance element, first capacitive element, the second capacitive element and institute
Access is between the high voltage bus and the low-voltage bus bar after stating the series connection of one-way conduction element；Or the one-way conduction element with
By first capacitive element and/or second capacitive element and pass through described the after 4th resistance element series connection
One resistance element, the switch element, the flow element are serially connected between the high voltage bus and the low-voltage bus bar.
11. drive control circuit according to claim 1, which is characterized in that the flow element be Hall sensor or
Resistance element.
12. drive control circuit according to claim 3, which is characterized in that further include:
Rectification circuit, output is the voltage signal of the high voltage bus after the rectification circuit rectifies AC signal.
13. a kind of air conditioner characterized by comprising
Motor；
Drive control circuit as described in any one of claims 1 to 12, 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 |
|---|---|---|---|
| CN2019100412697 | 2019-01-16 | ||
| CN201910041269 | 2019-01-16 |
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Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910447809.1A Pending CN110071626A (en) | 2019-01-16 | 2019-05-27 | Drive control circuit and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112212460A (en) * | 2020-08-28 | 2021-01-12 | 海信（山东）空调有限公司 | Air conditioner and shutdown control method |
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