CN106786438A - Current foldback circuit, motor and air-conditioner - Google Patents
Current foldback circuit, motor and air-conditioner Download PDFInfo
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- CN106786438A CN106786438A CN201611235613.9A CN201611235613A CN106786438A CN 106786438 A CN106786438 A CN 106786438A CN 201611235613 A CN201611235613 A CN 201611235613A CN 106786438 A CN106786438 A CN 106786438A
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- module
- signal
- partial pressure
- current foldback
- foldback circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/026—Current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient
Abstract
The invention provides a kind of current foldback circuit, motor and air-conditioner, wherein, the referrer module of current foldback circuit includes：N number of partial pressure unit, is connected in series between DC source and ground wire, and the resistance value state that each partial pressure unit accesses referrer module includes two kinds of low resistive state and high-impedance state, and the partial pressure value of the output end of module for reference is divided into 2NThe reference signal of individual gear；Wherein, N is the integer more than or equal to 2, output end not with DC source or ground wire short circuit.By technical scheme, various reference signals can flexibly be set according to the type of equipment and ambient parameter and be compared with sampled signal, improve the flexibility of overcurrent protection.
Description
Technical field
It is empty in particular to a kind of current foldback circuit, a kind of motor and one kind the present invention relates to field of circuit technology
Adjust device.
Background technology
Such as compressor, motor, engine threephase load equipment is in the course of the work, it usually needs set power model pair
It is driven and overcurrent protection, power chip especially smart power chip (Intelligent Power Module, referred to as
IPM) with its small size, big load current and fast response time the advantages of, is widely used in the drive control of large-scale electric equipment
In circuit, in order to ensure the reliability of power chip, protection circuit generally is set in its periphery, is mainly used for current-limiting protection
Effect.Wherein, the effect of overcurrent protection is essentially consisted in and protects threephase load equipment not burnt by excessively stream, especially for motor,
Electric current should be avoided causes motor permanent failure more than demagnetization current.
In correlation technique, current foldback circuit is as shown in figure 1, the current foldback circuit of power chip includes the company of being sequentially connected in series
It is connected to load sampling end (the P+ ends in sampling module 102) and overcurrent protection module (is connected to the excessively stream inside power chip to protect
Shield module) between noninductive resistance R1 ' and low-pass filtering module 104 (resistance R2 ' and electric capacity C ' shown in Fig. 1), without electrification
Resistance R1 ' voltages are input to the overcurrent protection module of inside modules by the low-pass filtering module 104 that resistance R2 ' and electric capacity C ' is constituted
(overcurrent protection port).
As shown in Fig. 2 demagnetization current is raised and approximately linear reduction with temperature, by taking ferrite compressor as an example, it is
Ensure the demagnetization current under low temperature, just have to sacrifice the frequency characteristic under hot environment, namely in high temperature environments can be with
Low-down frequency operation, thus directly sacrifices refrigerating capacity of the air-conditioning in hot environment.
Likewise, the reliability in order to ensure IPM modules, the temperature of IPM modules is controlled as a rigid condition
The running frequency of air-conditioning processed, for example to operating temperature too high time limit of IPM modules frequently, it is actually used in, the work temperature of IPM modules
Spend limit frequency high seldom to occur, the drop volume that such IPM modules are used is just excessive, and the drive system of motor does not perform to pole
Limit.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art or correlation technique.
Therefore, it is an object of the present invention to propose a kind of current foldback circuit.
It is another object of the present invention to propose a kind of motor.
Another object of the present invention is to propose a kind of air-conditioner.
To achieve the above object, embodiment according to the first aspect of the invention, it is proposed that a kind of current foldback circuit, mistake
The referrer module for flowing protection circuit includes：N number of partial pressure unit, is connected in series between DC source and ground wire, each partial pressure unit
The resistance value state for accessing referrer module includes two kinds of low resistive state and high-impedance state, the partial pressure value of the output end of module for reference
It is divided into 2NThe reference signal of individual gear；Wherein, N is the integer more than or equal to 2, and output end is not short with DC source or ground wire
Connect.
Current foldback circuit according to an embodiment of the invention, it is adaptable to the motor driven by power model, overcurrent protection
Circuit includes sampling module, comparison module and the referrer module of electrical connection, sampled signal and ginseng of the comparison module to sampling module
The reference signal for examining module is compared, and by the overcurrent protection end of comparative result signal output to power model, by setting
Referrer module includes N number of partial pressure unit, is connected in series between DC source and ground wire, and each partial pressure unit accesses referrer module
Resistance value state includes two kinds of low resistive state and high-impedance state, and the partial pressure value of the output end of module for reference is divided into 2NIndividual gear
Reference signal.
For example, when N is 3, referrer module has 8 kinds of partial pressure states, namely total resistance of referrer module is 8 kinds, therefore, ginseng
Module at most 8 partial pressure values of gear of output are examined, therefore, according to ambient parameter or device type corresponding point of one of which of output
Pressure value can be adjusted flexibly the output of reference signal as reference signal, improve the reliability and applicable model of current foldback circuit
Enclose.
Current foldback circuit according to the abovementioned embodiments of the present invention, can also have following technical characteristic：
According to one embodiment of present invention, each partial pressure unit includes：Divider resistance and switch element, switch element exist
When obtaining Continuity signal, switch element is accessed in referrer module, and short-circuit divider resistance, and corresponding partial pressure unit is with low-resistance shape
State is accessed in referrer module, and when Continuity signal is not obtained, divider resistance is accessed in referrer module switch element, and open circuit is opened
Element is closed, corresponding partial pressure unit is accessed in referrer module with high-impedance state.
In this embodiment, divider resistance and switch element are included by setting partial pressure unit, switch element is led in acquisition
During messenger, switch element is accessed in referrer module, and short-circuit divider resistance, and corresponding partial pressure unit is accessed with low resistive state
In referrer module, when Continuity signal is not obtained, divider resistance is accessed in referrer module switch element, and disconnect switch unit
Part, corresponding partial pressure unit is accessed in referrer module with high-impedance state, namely (acquisition Continuity signal) during switching elements conductive
Conducting resistance is much smaller than divider resistance, thus by divider resistance short circuit, and (do not obtain Continuity signal) when switch element is turned off,
Only in divider resistance access referrer module.
Wherein, Continuity signal can be generated by microprocessor, single-chip microcomputer or embedded device.
According to one embodiment of present invention, switch element is MOSFET IGCTs or igbt transistor.
In this embodiment, by setting switch element for MOSFET IGCTs or igbt transistor, possess fast conducting,
Low-power consumption, Reverse recovery be fast and the low feature of homomorphism pressure drop, improves the reliability of partial pressure unit.
According to one embodiment of present invention, also include：Current-limiting resistance, located at the input of switch element, to obtain
During Continuity signal, current limliting treatment is carried out to Continuity signal.
In this embodiment, current-limiting resistance is set by the input in switch element, reduces switch element by excessively stream
The possibility for puncturing, improves the reliability of overcurrent protection resistance.
According to one embodiment of present invention, also include：Switching device, is series at the output end and mistake of overcurrent protection signal
Between stream protection end, the drive end of switching device is connected to the output end of comparison module, with the comparative result according to comparison module
Signal conduction or shut-off, wherein, when comparison module judges that sampled signal is more than or equal to reference signal, comparison module is to switch
The drive end of device exports the first comparative result signal, and switch device conductive is with by overcurrent protection signal transmission to overcurrent protection
End, when comparison module judges that sampled signal is less than reference signal, comparison module compares to the drive end output second of switching device
Compared with consequential signal, switching device turns off to control overcurrent protection end not to be triggered.
In this embodiment, because directly by sampled signal or comparative result signal input overcurrent protection end, can adulterate difficulty
With the pulse signal or fluctuation signal that filter, overcurrent protection end may be caused by false triggering, therefore, connected by by switching device
Between the output end of overcurrent protection signal and overcurrent protection end, the drive end of switching device is connected to the output of comparison module
End, according to the comparative result signal conduction of comparison module or shut-off, to improve the reliability and accuracy of overcurrent protection module.
According to one embodiment of present invention, also include：Filtration module, in sampling module, including noninductive resistance and
First filter capacitor, the first end of noninductive resistance is connected to the sampled output of motor, and the second end of noninductive resistance is connected to ratio
Compared between an input of module, the first filter capacitor is connected between the second end of noninductive resistance and ground wire.
In this embodiment, by setting filtration module in sampling module, the friendship in sampled signal can be effectively filtered out
Flow noise, improves the accuracy and reliability of the judgement of comparison module.
According to one embodiment of present invention, divider resistance is positive temperature coefficient thermo-sensitive resistor or the temperature sensitive electricity of negative temperature coefficient
Resistance.
In this embodiment, by setting divider resistance for positive temperature coefficient thermo-sensitive resistor or the temperature sensitive electricity of negative temperature coefficient
Resistance, the resistance of above-mentioned thermo-sensitive resistor changes with temperature linearity, so that referrer module exports the corresponding partial pressure of any temperature
Value, because thermo-sensitive resistor generally changes with temperature linearity, therefore, the partial pressure value of thermo-sensitive resistor also changes with temperature linearity.
Demagnetization current is typically the linear reduction with temperature rising, therefore, the reference signal of referrer module output also should
This is reduced as temperature is raised, also, reference signal at any temperature is below the corresponding magnitude of voltage of demagnetization current, keeps away
The memory source of microprocessor is exempted to take, you can actively spontaneously adjust reference signal, improve overcurrent protection scheme can
By property and promptness.
According to one embodiment of present invention, also include：Second filter capacitor, is connected in parallel to the both sides of divider resistance.
In this embodiment, by setting the second filter capacitor, the both sides of divider resistance are connected in parallel to, it is possible to reduce ginseng
Examine the AC noise in signal, and then improve the reliability of reference signal, further improve the judgement of comparison module
Accuracy and reliability.
The motor of second aspect present invention embodiment, including the overcurrent protection of any embodiment of first aspect present invention is electric
Road, therefore the server apparatus have whole beneficial effects of the current foldback circuit of any of the above-described embodiment, no longer go to live in the household of one's in-laws on getting married herein
State.
The air-conditioner of third aspect present invention embodiment, including any embodiment of second aspect present invention motor, because
This air-conditioner has whole beneficial effects of the motor of any of the above-described embodiment, will not be repeated here.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Fig. 1 shows the schematic diagram of the current foldback circuit in correlation technique；
Fig. 2 shows the schematic diagram that the demagnetization current of the motor in correlation technique is changed over time；
Fig. 3 shows the schematic diagram of current foldback circuit according to an embodiment of the invention.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied to be further described in detail the present invention.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 3 shows the schematic diagram of current foldback circuit according to an embodiment of the invention.
As shown in figure 3, current foldback circuit, the referrer module 204 of current foldback circuit according to an embodiment of the invention
Including：N number of partial pressure unit, is connected in series between DC source and ground wire, and each partial pressure unit accesses the resistance of referrer module 204
State includes two kinds of low resistive state and high-impedance state, and the partial pressure value of the output end of module for reference 204 is divided into 2NIndividual gear
Reference signal；Wherein, N is the integer more than or equal to 2, output end not with DC source or ground wire short circuit.
Current foldback circuit according to an embodiment of the invention, it is adaptable to the motor driven by power model IPM, excessively stream is protected
Protection circuit includes sampling module 202, comparison module 206 and the referrer module 204 of electrical connection, and comparison module 206 is to sampling module
202 sampled signal and the reference signal of referrer module 204 are compared, and by comparative result signal output to power model
The overcurrent protection end ITRIP of IPM, N number of partial pressure unit is included by setting referrer module 204, is connected in series in DC source with ground
Between line, the resistance value state that each partial pressure unit accesses referrer module 204 includes two kinds of low resistive state and high-impedance state, for ginseng
The partial pressure value for examining the output end of module 204 is divided into 2NThe reference signal of individual gear.
Embodiment：
When set N be 2 when, referrer module 204 include first resistor R01, second resistance R02, the first partial pressure unit U1 and
Second partial pressure unit U2, is series between DC source 5V and ground wire, wherein, the first partial pressure unit U1 also includes be connected in parallel the
One divider resistance R1 and first switch element Q1, in addition in the input first current-limiting resistance R3 of setting of first switch element Q1,
Second partial pressure unit U2 also includes the second divider resistance R2 and second switch element Q2 that are connected in parallel, in addition in second switch unit
The input of part Q2 sets the second current-limiting resistance R4, has 4 kinds of partial pressure states, namely total resistance of referrer module 204 is 4 kinds,
Therefore, at most 4 partial pressure values of gear of output of referrer module 204, therefore, according to ambient parameter or device type output wherein one
Corresponding partial pressure value is planted as reference signal, the output of reference signal can be adjusted flexibly, improve the reliability of current foldback circuit
Property and the scope of application.
Current foldback circuit according to the abovementioned embodiments of the present invention, can also have following technical characteristic：
According to one embodiment of present invention, each partial pressure unit includes：Divider resistance and switch element, switch element exist
When obtaining Continuity signal, switch element is accessed in referrer module 204, and short-circuit divider resistance, and corresponding partial pressure unit is with low
Resistance state is accessed in referrer module 204, and when Continuity signal is not obtained, divider resistance is accessed in referrer module 204 switch element,
And disconnect switch element, corresponding partial pressure unit is accessed in referrer module 204 with high-impedance state.
In this embodiment, divider resistance and switch element are included by setting partial pressure unit, switch element is led in acquisition
During messenger, switch element is accessed in referrer module 204, and short-circuit divider resistance, and corresponding partial pressure unit is with low resistive state
Access in referrer module 204, when Continuity signal is not obtained, divider resistance is accessed in referrer module 204 switch element, and is broken
Way switch element, corresponding partial pressure unit is accessed in referrer module 204 with high-impedance state, namely (is obtained during switching elements conductive
Continuity signal) conducting resistance be much smaller than divider resistance, thus by divider resistance short circuit, and (do not obtained when switch element is turned off
Take Continuity signal), only in divider resistance access referrer module 204.
Wherein, Continuity signal can be generated by microprocessor, single-chip microcomputer or embedded device.
According to one embodiment of present invention, switch element is MOSFET IGCTs or igbt transistor.
In this embodiment, by setting switch element for MOSFET IGCTs or igbt transistor, possess fast conducting,
Low-power consumption, Reverse recovery be fast and the low feature of homomorphism pressure drop, improves the reliability of partial pressure unit.
According to one embodiment of present invention, also include：Current-limiting resistance (the first current-limiting resistance R3 as shown in Figure 3 and
Two current-limiting resistance R4), located at the input of switch element, when Continuity signal is obtained, current limliting treatment is carried out to Continuity signal.
In this embodiment, current-limiting resistance is set by the input in switch element, reduces switch element by excessively stream
The possibility for puncturing, improves the reliability of overcurrent protection resistance.
According to one embodiment of present invention, also include：Switching device Q3, be series at the output end of overcurrent protection signal with
Between the ITRIP of overcurrent protection end, the drive end of switching device Q3 is connected to the output end of comparison module 206, with according to comparing mould
The comparative result signal conduction of block 206 or shut-off, wherein, judge sampled signal more than or equal to reference to letter in comparison module 206
Number when, drive end from comparison module 206 to switching device Q3 export the first comparative result signal, switching device Q3 conducting with incited somebody to action
Stream protection signal transmission, when comparison module 206 judges that sampled signal is less than reference signal, compares to overcurrent protection end ITRIP
Module 206 exports the second comparative result signal to the drive end of switching device Q3, and switching device Q3 turns off to control overcurrent protection
End ITRIP is not triggered.
In this embodiment, due to by sampled signal or comparative result signal input overcurrent protection end ITRIP, can directly mix
The miscellaneous pulse signal or fluctuation signal being difficult to filter out, may cause overcurrent protection end ITRIP by false triggering, therefore, by that will open
Close device Q3 to be series between the output end of overcurrent protection signal and overcurrent protection end ITRIP, the drive end of switching device Q3 connects
The output end of comparison module 206 is connected to, according to the comparative result signal conduction of comparison module 206 or shut-off, to improve excessively stream
The reliability and accuracy of protection module.
Embodiment：
Switching device Q3 can also be MOSFET IGCTs or igbt transistor, as shown in figure 3, switching device Q3 is IGBT
During transistor, the drive end of switching device Q3 is connected to the output end of comparison module, the colelctor electrode c of switching device Q3 for base stage b
Dc source 5V is connected to, the emitter e of switching device Q3 is connected to overcurrent protection end ITRIP, and the load voltage of resistance R4 is made
It is the overcurrent protection module work of drive signal triggering overcurrent protection end ITRIP inner side connections.
According to one embodiment of present invention, also include：Filtration module 208, it is in sampling module 202 including noninductive
The first end of resistance R3 and the first filter capacitor C, noninductive resistance R3 is connected to the sampled output P+ of motor, noninductive resistance R3's
Second end is connected between an input of comparison module 206, and the first filter capacitor C is connected to second end of noninductive resistance R3
Between ground wire.
In this embodiment, by setting filtration module 208 in sampling module 202, sampled signal can be effectively filtered out
In AC noise, improve the accuracy and reliability of the judgement of comparison module 206.
According to one embodiment of present invention, divider resistance is positive temperature coefficient thermo-sensitive resistor or the temperature sensitive electricity of negative temperature coefficient
Resistance.
In this embodiment, by setting divider resistance for positive temperature coefficient thermo-sensitive resistor or the temperature sensitive electricity of negative temperature coefficient
Resistance, the resistance of above-mentioned thermo-sensitive resistor changes with temperature linearity so that referrer module 204 to export any temperature corresponding one point
Pressure value, because thermo-sensitive resistor generally changes with temperature linearity, therefore, the partial pressure value of thermo-sensitive resistor also changes with temperature linearity.
Demagnetization current is typically the linear reduction with temperature rising, therefore, the reference signal of the output of referrer module 204
Should be reduced as temperature is raised, also, reference signal at any temperature is below the corresponding magnitude of voltage of demagnetization current,
Avoid the memory source for taking microprocessor, you can actively spontaneously adjust reference signal, improve overcurrent protection scheme
Reliability and promptness.
According to one embodiment of present invention, also include：Second filter capacitor, is connected in parallel to the both sides of divider resistance.
In this embodiment, by setting the second filter capacitor, the both sides of divider resistance are connected in parallel to, it is possible to reduce ginseng
Examine the AC noise in signal, and then improve the reliability of reference signal, further improve the judgement of comparison module 206
Accuracy and reliability.
Technical scheme is described in detail above in association with accompanying drawing, the present invention proposes a kind of new overcurrent protection electricity
Road, it is adaptable to the motor driven by power model, current foldback circuit includes sampling module, comparison module and the reference of electrical connection
Module, comparison module is compared to the sampled signal of sampling module and the reference signal of referrer module, and comparative result is believed
Number output includes N number of partial pressure unit to the overcurrent protection end of power model by setting referrer module, is connected in series in DC source
Between ground wire, the resistance value state that each partial pressure unit accesses referrer module includes two kinds of low resistive state and high-impedance state, for
The partial pressure value of the output end of referrer module is divided into 2NThe reference signal of individual gear.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of current foldback circuit, it is adaptable to which the motor driven by power model, the current foldback circuit includes electrical connection
Sampling module, comparison module and referrer module, sampled signal and the reference of the comparison module to the sampling module
The reference signal of module is compared, and by the overcurrent protection end of comparative result signal output to power model, it is characterised in that
The referrer module of the current foldback circuit includes：
N number of partial pressure unit, is connected in series between DC source and ground wire, and each described partial pressure unit accesses the referrer module
Resistance value state includes two kinds of low resistive state and high-impedance state, so that the partial pressure value of the output end of the referrer module is divided into 2NIt is individual
The reference signal of gear；
Wherein, the N is the integer more than or equal to 2, the output end not with the DC source or ground wire short circuit.
2. current foldback circuit according to claim 1, it is characterised in that each described partial pressure unit includes：
Divider resistance and switch element, when Continuity signal is obtained, the switch element accesses the reference to the switch element
In module, and the short-circuit divider resistance, the corresponding partial pressure unit is with the low resistive state access referrer module
In, when Continuity signal is not obtained, the divider resistance is accessed in the referrer module switch element, and open circuit is described
Switch element, the corresponding partial pressure unit is accessed in the referrer module with the high-impedance state.
3. current foldback circuit according to claim 2, it is characterised in that
The switch element is MOSFET IGCTs or igbt transistor.
4. current foldback circuit according to claim 2, it is characterised in that also include：
Current-limiting resistance, located at the input of the switch element, when the Continuity signal is obtained, to enter to the Continuity signal
The treatment of row current limliting.
5. current foldback circuit according to claim 1, it is characterised in that also include：
Switching device, is series between the output end of overcurrent protection signal and the overcurrent protection end, the drive of the switching device
Moved end is connected to the output end of the comparison module, with according to the comparative result signal conduction of the comparison module or shut-off,
Wherein, when the comparison module judges that the sampled signal is more than or equal to the reference signal, the comparison module
The first comparative result signal is exported to the drive end of the switching device, the switch device conductive is believed with by the overcurrent protection
Number transmit to the overcurrent protection end, it is described when the comparison module judges that the sampled signal is less than the reference signal
Comparison module exports the second comparative result signal to the drive end of the switching device, and the switching device shut-off is described to control
Overcurrent protection end is not triggered.
6. current foldback circuit according to claim 1, it is characterised in that also include：
Filtration module, in the sampling module, including noninductive resistance and the first filter capacitor, the first of the noninductive resistance
End is connected to the sampled output of the motor, and the second end of the noninductive resistance is connected to an input of the comparison module
Between end, first filter capacitor is connected between the second end of noninductive resistance and ground wire.
7. current foldback circuit according to any one of claim 1 to 6, it is characterised in that
The divider resistance is positive temperature coefficient thermo-sensitive resistor or negative temperature coefficient thermo-sensitive resistor.
8. current foldback circuit according to any one of claim 1 to 6, it is characterised in that
Second filter capacitor, is connected in parallel to the both sides of the divider resistance.
9. a kind of motor, it is characterised in that including：
Power model；
Current foldback circuit as any one of claim requirement 1 to 8, is connected to the overcurrent protection of the power model
End；
Threephase load, is connected to the three-phase output end of the power model.
10. a kind of air-conditioner, it is characterised in that including：
Motor as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235613.9A CN106786438A (en) | 2016-12-28 | 2016-12-28 | Current foldback circuit, motor and air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611235613.9A CN106786438A (en) | 2016-12-28 | 2016-12-28 | Current foldback circuit, motor and air-conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN106786438A true CN106786438A (en) | 2017-05-31 |
Family
ID=58923915
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611235613.9A Pending CN106786438A (en) | 2016-12-28 | 2016-12-28 | Current foldback circuit, motor and air-conditioner |
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| CN103312262A (en) * | 2012-03-15 | 2013-09-18 | 日立空调·家用电器株式会社 | Motor drive device, fluid compression system and air conditioner |
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| CN204243730U (en) * | 2014-09-10 | 2015-04-01 | 广东美的集团芜湖制冷设备有限公司 | The current foldback circuit of Intelligent Power Module and air conditioner |
| CN104753188A (en) * | 2013-12-30 | 2015-07-01 | 丹佛斯（天津）有限公司 | Motor, compressor and method for controlling motor or compressor |
| CN206283248U (en) * | 2016-12-28 | 2017-06-27 | 广东美的制冷设备有限公司 | Current foldback circuit, motor and air-conditioner |
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2016
- 2016-12-28 CN CN201611235613.9A patent/CN106786438A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103004092A (en) * | 2011-05-11 | 2013-03-27 | 富士电机株式会社 | Drive circuit for insulated-gate-type switching element |
| CN103124064A (en) * | 2011-11-18 | 2013-05-29 | 广东美芝制冷设备有限公司 | Protection method for preventing frequency conversion compressor from demagnetization |
| CN103312262A (en) * | 2012-03-15 | 2013-09-18 | 日立空调·家用电器株式会社 | Motor drive device, fluid compression system and air conditioner |
| CN104753188A (en) * | 2013-12-30 | 2015-07-01 | 丹佛斯（天津）有限公司 | Motor, compressor and method for controlling motor or compressor |
| CN103944141A (en) * | 2014-04-02 | 2014-07-23 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
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Application publication date: 20170531 |