CN206283248U - Current foldback circuit, motor and air-conditioner - Google Patents
Current foldback circuit, motor and air-conditioner Download PDFInfo
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- CN206283248U CN206283248U CN201621455949.1U CN201621455949U CN206283248U CN 206283248 U CN206283248 U CN 206283248U CN 201621455949 U CN201621455949 U CN 201621455949U CN 206283248 U CN206283248 U CN 206283248U
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Abstract
The utility model 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 the technical solution of the utility model, 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
The utility model is related to field of circuit technology, in particular to a kind of current foldback circuit, a kind of motor and
Plant air-conditioner.
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.
Utility model content
The utility model is intended at least solve one of technical problem present in prior art or correlation technique.
Therefore, a purpose of the present utility model is to propose a kind of current foldback circuit.
Another purpose of the present utility model is to propose a kind of motor.
Further object of the present utility model is to propose a kind of air-conditioner.
To achieve the above object, according to the embodiment of first aspect of the present utility model, it is proposed that a kind of overcurrent protection electricity
Road, the referrer module of current foldback circuit includes：N number of partial pressure unit, is connected in series between DC source and ground wire, each partial pressure
Unit access referrer module resistance value state include two kinds of low resistive state and high-impedance state, the output end of module for reference point
Pressure value 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.
According to the current foldback circuit of embodiment of the present utility model, it is adaptable to the motor driven by power model, excessively stream
Protection circuit includes sampling module, comparison module and the referrer module of electrical connection, sampled signal of the comparison module to sampling module
Reference signal with referrer module is compared, and by the overcurrent protection end of comparative result signal output to power model, passes through
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 is accessed and refers to mould
The resistance value state of block 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 2NIt is individual
The reference signal of gear.
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.
According to the current foldback circuit of above-described embodiment of the present utility model, there can also be following technical characteristic：
According to one embodiment of the present utility model, each partial pressure unit includes：Divider resistance and switch element, switch unit
When Continuity signal is obtained, switch element is accessed in referrer module part, and short-circuit divider resistance, and corresponding partial pressure unit is with low
Resistance state is accessed in referrer module, and when Continuity signal is not obtained, divider resistance is accessed in referrer module switch element, and is broken
Way switch element, 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 the present utility model, 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 the present utility model, also include：Current-limiting resistance, located at the input of switch element, with
When obtaining 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 the present utility model, also include：Switching device, is series at the output end of overcurrent protection signal
Between overcurrent protection end, the drive end of switching device is connected to the output end of comparison module, with the comparing according to comparison module
Consequential signal on or off, wherein, comparison module judge sampled signal be more than or equal to reference signal when, comparison module to
The drive end of switching device exports the first comparative result signal, and switch device conductive is protected with by overcurrent protection signal transmission to excessively stream
Shield end, when comparison module judges that sampled signal is less than reference signal, comparison module exports second to the drive end of switching device
Comparative result 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 the present utility model, also include：Filtration module, in sampling module, including without electrification
Resistance and the first filter capacitor, the first end of noninductive resistance are connected to the sampled output of motor, the second end connection of noninductive resistance
To between an input of comparison 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 the present utility model, divider resistance is positive temperature coefficient thermo-sensitive resistor or negative temperature coefficient temperature
Quick 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 the present utility model, also include：Second filter capacitor, is connected in parallel to the two of divider resistance
Side.
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 the utility model second aspect embodiment, including any embodiment of the utility model first aspect mistake
Stream protection circuit, therefore the server apparatus have whole beneficial effects of the current foldback circuit of any of the above-described embodiment,
This is repeated no more.
The air-conditioner of the utility model third aspect embodiment, including the utility model second aspect any embodiment
Motor, therefore the 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 present utility model and advantage will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
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 the current foldback circuit according to embodiment of the present utility model.
Specific embodiment
In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool
Body implementation method is further described in detail to the utility model.It should be noted that in the case where not conflicting, this Shen
Feature in embodiment please and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the utility model, but, this practicality
It is new to be different from other modes described here using other to implement, therefore, protection domain of the present utility model is simultaneously
Do not limited by following public specific embodiment.
Fig. 3 shows the schematic diagram of the current foldback circuit according to embodiment of the present utility model.
As shown in figure 3, according to the current foldback circuit of embodiment of the present utility model, the referrer module of current foldback circuit
204 include：N number of partial pressure unit, is connected in series between DC source and ground wire, and each partial pressure unit accesses referrer module 204
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 204 is divided into 2NIt is individual
The reference signal of gear；Wherein, N is the integer more than or equal to 2, output end not with DC source or ground wire short circuit.
According to the current foldback circuit of embodiment of the present utility model, it is adaptable to the motor driven by power model IPM, mistake
Stream protection circuit includes sampling module 202, comparison module 206 and the referrer module 204 of electrical connection, 206 pairs of samplings of comparison module
The sampled signal of module 202 and the reference signal of referrer module 204 are compared, and by comparative result signal output to power mould
The overcurrent protection end ITRIP of block IPM, by setting referrer module 204 including N number of partial pressure unit, be connected in series in DC source with
Between ground wire, 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
The partial pressure value of the output end of referrer 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.
According to the current foldback circuit of above-described embodiment of the present utility model, there can also be following technical characteristic：
According to one embodiment of the present utility model, each partial pressure unit includes：Divider resistance and switch element, switch unit
When Continuity signal is obtained, switch element is accessed in referrer module 204 part, and short-circuit divider resistance, corresponding partial pressure unit
So that in low resistive state access referrer module 204, when Continuity signal is not obtained, divider resistance accesses referrer module to switch element
In 204, and disconnect switch element, corresponding partial pressure unit is with high-impedance state access referrer module 204.
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 the present utility model, 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 the present utility model, also include：Current-limiting resistance (the first current-limiting resistance R3 as shown in Figure 3
With the second current-limiting resistance R4), located at the input of switch element, when Continuity signal is obtained, current limliting is carried out to Continuity signal
Treatment.
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 the present utility model, also include：Switching device Q3, is series at the output of overcurrent protection signal
End and overcurrent protection end ITRIP between, the drive end of switching device Q3 is connected to the output end of comparison module 206, with according to than
Compared with the comparative result signal conduction of module 206 or shut-off, wherein, judge sampled signal more than or equal to ginseng in comparison module 206
When examining signal, drive end from comparison module 206 to switching device Q3 export the first comparative result signal, switching device Q3 conducting with
By overcurrent protection signal transmission to overcurrent protection end ITRIP, when comparison module 206 judges that sampled signal is less than reference signal,
Comparison module 206 exports the second comparative result signal to the drive end of switching device Q3, and switching device Q3 turns off to control excessively stream
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 the present utility model, also include：Filtration module 208, in sampling module 202, including
The first end of noninductive resistance R3 and the first filter capacitor C, noninductive resistance R3 is connected to the sampled output P+ of motor, noninductive resistance
Second end of R3 is connected between an input of comparison module 206, and the first filter capacitor C is connected to the of noninductive resistance R3
Between two ends and 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 the present utility model, divider resistance is positive temperature coefficient thermo-sensitive resistor or negative temperature coefficient temperature
Quick 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 the present utility model, also include：Second filter capacitor, is connected in parallel to the two of divider resistance
Side.
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.
The technical solution of the utility model is described in detail above in association with accompanying drawing, the utility model proposes a kind of new mistake
Stream protection circuit, it is adaptable to the motor driven by power model, current foldback circuit includes the sampling module of electrical connection, compares mould
Block and referrer module, comparison module are compared to the sampled signal of sampling module and the reference signal of referrer module, and will compare
Exported to the overcurrent protection end of power model compared with consequential signal, N number of partial pressure unit is included by setting referrer module, be connected in series
Between DC source and ground wire, the resistance value state that each partial pressure unit accesses referrer module includes low resistive state and high-impedance state two
Kind, the partial pressure value of the output end of module for reference is divided into 2NThe reference signal of individual gear.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
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 |
|---|---|---|---|
| CN201621455949.1U CN206283248U (en) | 2016-12-28 | 2016-12-28 | Current foldback circuit, motor and air-conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621455949.1U CN206283248U (en) | 2016-12-28 | 2016-12-28 | Current foldback circuit, motor and air-conditioner |
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| Publication Number | Publication Date |
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| CN206283248U true CN206283248U (en) | 2017-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786438A (en) * | 2016-12-28 | 2017-05-31 | 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 CN201621455949.1U patent/CN206283248U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786438A (en) * | 2016-12-28 | 2017-05-31 | 广东美的制冷设备有限公司 | Current foldback circuit, motor and air-conditioner |
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