CN207967917U - A kind of current protective device and compressor circuit - Google Patents
A kind of current protective device and compressor circuit Download PDFInfo
- Publication number
- CN207967917U CN207967917U CN201721701252.2U CN201721701252U CN207967917U CN 207967917 U CN207967917 U CN 207967917U CN 201721701252 U CN201721701252 U CN 201721701252U CN 207967917 U CN207967917 U CN 207967917U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- ipm
- resistance
- protected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a kind of current protective device and compressor circuits, wherein the current protective device includes：Sample circuit (1) obtains sampled voltage for sampling the voltage signal of inverter bridge lower bridge arm IGBT emitter currents load on it in the affiliated power-supply systems of IPM to be protected；Negative current detection circuit (2), if the sampled voltage is more than the negative voltage threshold value, starts the negative sense overcurrent protection processing of setting for detecting whether the sampled voltage is more than the negative voltage threshold value set；Forward current detection circuit (3), if the sampled voltage is more than the forward voltage threshold, starts the positive overcurrent protection processing of setting for detecting whether the sampled voltage is more than the forward voltage threshold set.The embodiment of the utility model, can overcome in the prior art of high cost, waveform easily distort and the defects of protection reliability be poor, the advantageous effect that cost of implementation is low, waveform is not easy distortion and protection reliability is good.
Description
Technical field
The utility model belongs to current protection technical field, and in particular to a kind of current protective device and compressor circuit,
More particularly to a kind of single resistance sampling and bidirectional protective circuit, compressor circuit with the circuit and the compressor circuit
Current protection method.
Background technology
Compressor sample circuit passes through the IPM (Intelligent in driving compressor based on three resistance samplings at present
Power Module, i.e. intelligent power module) lower bridge arm connects the sampling resistors of several milliohms, corresponding voltage is obtained, using
Operational amplification circuit is adjusted by direction, and voltage value is collected in main control chip, carries out operation.But sampling resistor at
This is higher, while three resistance samplings need 4 tunnel amplifiers, therefore cost is higher, and single resistance sampling only needs a sampling resistor and 2
Road amplifier has advantage at low cost.Although single resistance sampling has begun to apply, single resistance sampling signal waveform is multiple
Miscellaneous, the case where level multiple there are same signal, and the frequency sampled is also relatively high, is easy disturbed, causes feedback signal abnormal
Become serious so as to cause compressor current wave distortion.Since compressor current is sine wave, there are reversals, in protection electricity
Lu Zhong, typically positive current are detected in real work, and first overcurrent possibly both had been present at positive current, it is also possible to appear in
Negative and positive electric current.
In the prior art, it easily distorts there are of high cost, waveform and the defects of protection reliability is poor.
Utility model content
The purpose of this utility model is that in view of the foregoing drawbacks, a kind of current protective device and compressor circuit are provided, with
Solve in the prior art when first overcurrent of compressor circuit appears in negative current can not effective protection cause protection can
By the problem of property difference, achieve the effect that promote protection reliability.
The utility model provides a kind of current protective device, including：Sample circuit, negative current detection circuit and forward direction electricity
Current detection circuit；Wherein, the sample circuit, for sampling inverter bridge lower bridge arm IGBT in the affiliated power-supply systems of IPM to be protected
The voltage signal of emitter current load on it, obtains sampled voltage；The negative current detection circuit, it is described for detecting
Whether sampled voltage is more than that the negative voltage threshold value set starts if the sampled voltage is more than the negative voltage threshold value
The negative sense overcurrent protection of setting is handled；The forward current detection circuit, for detecting whether the sampled voltage is more than setting
Forward voltage threshold, if the sampled voltage be more than the forward voltage threshold, start at the positive overcurrent protection of setting
Reason.
Optionally, further include：At least one of filter circuit and operational amplifier circuit；Wherein, the filter circuit, for pair
The sampled voltage is filtered；And/or the operational amplifier circuit, for carrying out operation to the sampled voltage and/or putting
Big processing；Wherein, the negative current detection circuit and/or the sampled voltage of forward current detection circuit detection,
Including：Through the filter circuit and/or the operational amplifier circuit treated sampled voltage.
Optionally, wherein when the device further includes filter circuit and operational amplifier circuit, the filter circuit is set to described
Between sample circuit and the operational amplifier circuit；The sample circuit, including：Sampling resistor；The sampled voltage is the sampling
The voltage at resistance both ends；Wherein, the voltage of the sampling resistor first end, is sent into the operational amplifier circuit after the filter circuit
The first in-phase input end；The voltage of the sampling resistor second end is sent into the operational amplifier circuit after the adjusting circuit being set
The first inverting input；First output end of the operational amplifier circuit exports the sampled voltage after operation and/or enhanced processing
To the negative current detection circuit or the forward current detection circuit；And/or the filter circuit, including：The first order is filtered
Wave circuit and second level filter circuit；Wherein, in the first order filter circuit and the second level filter circuit at least it
One, including：RC filter circuits.
Optionally, further include：At least one of feedback circuit, bleeder circuit and output circuit；Wherein, the feedback electricity
Road, for being further amplified through the operational amplifier circuit operation and/or amplified sampled voltage, obtaining exporting to described
The sampled voltage of negative current detection circuit or the forward current detection circuit；And/or the bleeder circuit, it is set to institute
The second in-phase input end for stating operational amplifier circuit, for carrying out voltage division processing to the sampled voltage being input in the operational amplifier circuit,
The mean voltage of the main control chip supply voltage of motherboard circuit where obtaining the IPM；And/or the output circuit, for pair
It is carried out in the main control chip of motherboard circuit where sampled voltage after the feedback circuit is further amplified is delivered to the IPM
Further sampling.
Optionally, wherein when the device further includes adjusting circuit, the adjusting circuit, including：First divider resistance and
Second divider resistance；First divider resistance and second divider resistance, are connected on the sampling resistor second end and institute
Between the second in-phase input end for stating operational amplifier circuit；Wherein, the resistance value of first divider resistance and second divider resistance
The sum of, it is equal with the sum of resistance value of filter resistance in the RC filter circuits of the filter circuit；And/or the feedback circuit, packet
It includes：First feedback resistance and/or the second feedback resistance；Wherein, first feedback resistance is set to the of the operational amplifier circuit
Between two output ends and the first inverting input；Second feedback resistance, the second reverse phase for being set to the operational amplifier circuit are defeated
Enter between end, second output terminal and the first in-phase input end；And/or the output circuit, including：First current-limiting resistance, first
Pull down resistor, the first filter capacitor and the first diode；Wherein, the first connecting pin of first current-limiting resistance, respectively with institute
State the first output end, first pull down resistor, the negative current detection circuit and the forward current of operational amplifier circuit
Detection circuit connects；The second connection end of first current-limiting resistance is filtered with the anode of first diode, first respectively
Capacitance is connected with the sampling end of the main control chip of motherboard circuit where the IPM.
Optionally, the negative current detection circuit, including：Second current-limiting resistance, negative sense threshold setting module and first
Comparator；Wherein, second current-limiting resistance is connected to the reverse phase of the output end and the first comparator of the sampled voltage
Between input terminal；Wherein, when the device further includes operational amplifier circuit, second current-limiting resistance is connected to the operational amplifier circuit
The first output end and the inverting input of the first comparator between；The negative sense threshold setting module is set to described
The in-phase input end of first comparator, for setting the negative voltage threshold value；The first comparator, for defeated to its reverse phase
The sampled voltage for entering end input is compared with the negative voltage threshold value that in-phase input end is set；If its inverting input is defeated
The sampled voltage entered is more than the negative voltage threshold value, then exports high level to the control terminal of IPM to be protected, to IPM to be protected
It is protected；If the sampled voltage of its inverting input input is less than the negative voltage threshold value, low level is exported to waiting for
The control terminal for protecting IPM, makes IPM normal operations to be protected；And/or the forward current detection circuit, including：Third current limliting
Resistance, positive threshold setting module and the second comparator；Wherein, the third current-limiting resistance, is connected to the sampled voltage
Between output end and the in-phase input end of second comparator；Wherein, when the device further includes operational amplifier circuit, the third
Current-limiting resistance is connected between the first output end of the operational amplifier circuit and the in-phase input end of second comparator；It is described
Positive threshold setting module is set to the inverting input of second comparator, for setting the forward voltage threshold；Institute
The second comparator is stated, the forward voltage threshold of the sampled voltage for being inputted to its in-phase input end and inverting input setting
Value is compared；If the sampled voltage of its in-phase input end input is more than the forward voltage threshold, high level is exported to waiting for
The control terminal for protecting IPM, protects IPM to be protected；If its in-phase input end input sampled voltage be less than it is described just
To voltage threshold, then low level is exported to the control terminal of IPM to be protected, makes IPM normal operations to be protected；And/or the negative sense
At least one of overcurrent protection processing, the positive overcurrent protection processing, including：Turn off the control of the control terminal of IPM to be protected
Signal processed.
Optionally, the negative current detection circuit further includes：In first pull-up resistor and the second diode at least it
One；Wherein, first pull-up resistor is connected to the confession of the output end and master chip in IPM to be protected of the first comparator
Between piezoelectric voltage；And/or the anode of second diode, it is connect with the output end of the first comparator；Described 2nd 2
The cathode of pole pipe is connect with the control terminal of IPM to be protected；And/or the forward current detection circuit, further include：Second pull-up
At least one of resistance and third diode；Wherein, second pull-up resistor is connected to the output of second comparator
End and IPM to be protected in master chip supply voltage between；And/or the anode of the third diode, compared with described second
The output end of device connects；The cathode of the third diode, connect with the control terminal of IPM to be protected.
Optionally, in the control terminal of IPM to be protected, it is additionally provided with the second pull down resistor；Second pull down resistor, is connected to
The cathode of the cathode of second diode and/or the third diode；And/or the negative sense threshold setting module, packet
It includes：Third divider resistance, the 4th divider resistance and the second filter capacitor；Wherein, the third divider resistance is connected to described
In the in-phase input end of two comparators and IPM to be protected between the supply voltage of master chip；4th divider resistance with it is described
Second filter capacitor is connected in parallel between the in-phase input end and ground of second comparator；And/or the positive threshold setting
Module, including：5th divider resistance, the 6th divider resistance and third filter capacitor；Wherein, the 5th divider resistance, connection
In the inverting input and IPM to be protected of second comparator between the supply voltage of master chip；The 6th partial pressure electricity
Resistance and the third filter capacitor, are connected in parallel between the inverting input and ground of second comparator.
Matching with above-mentioned current protective device, on the other hand the utility model provides a kind of compressor circuit, including：With
The upper current protective device.
The embodiment of the utility model, by having carried out secondary filter processing to sampled signal so that interference component in signal
Drop to very low, the signal for participating in amplifier is more nearly actual voltage so that compressor current table in single resistance sampling circuit
Waveform is preferable.
Further, the embodiment of the utility model, by increasing negative current detection circuit, in conjunction with positive electricity current detection circuit, nothing
Positive current or negative current are appeared in by first overcurrent, it being capable of effective protection.
Further, the embodiment of the utility model, by making amplified sampled voltage enter main core after current-limiting resistance
Piece is sampled, while connecting positive current protection circuit and negative current protection circuit, in the rear end setting of reversal protection circuit
Pull-up resistor, it is ensured that stability；What solution can not be protected in time when first overcurrent of compressor circuit appears in negative current
Problem reaches the technique effect that can be protected much sooner to overcurrent.
The embodiment of the utility model as a result, by increasing negative current detection circuit, first when compressor circuit is excessively electric
It can be solved to appear in first overcurrent of compressor circuit in the prior art negative with effective protection when flowing out present negative current
When electric current can not effective protection lead to the problem of protection reliability difference, to, overcome in the prior art of high cost, waveform easily distort
With the defect of protection reliability difference, the advantageous effect that cost of implementation is low, waveform is not easy distortion and protection reliability is good.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of single resistance sampling scheme；
Fig. 2 is the structural schematic diagram of another single resistance sampling scheme；
Fig. 3 is the structural schematic diagram of an embodiment of the current protective device of the utility model；
Fig. 4 be the utility model current protective device in single resistance sampling circuit first part an embodiment knot
Structure schematic diagram；
Fig. 5 be the utility model current protective device in single resistance sampling circuit second part an embodiment knot
Structure schematic diagram.
In conjunction with attached drawing, reference numeral is as follows in the utility model embodiment：
1- sample circuits；2- negative current detection circuits；3- forward current detection circuits；4- filter circuits；5- amplifier electricity
Road；6- adjusts circuit；7- feedback circuits；8- bleeder circuits；9- output circuits；10- negative sense threshold setting modules；11- forward direction thresholds
It is worth setting module.
Specific implementation mode
It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
Only it is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
The every other embodiment that those of ordinary skill is obtained without making creative work, belongs to the utility model
The range of protection.
A kind of single resistance sampling scheme shown in Figure 1.Compressor current is after sampling resistor Rs, in sampling resistor
Rs is upper to have a voltage, directly sample and feed back to sampled voltage protection port OCP (the voltage height of IPM modules itself
Enter guard mode in 0.5V), such method is simple.But since sampled voltage is low, electromagnetic environment is complicated, exists through constant error
The case where action, causes sampled voltage occur larger disturbance occur because sampled voltage is often subject to interfere, in electromagnetism
In the case of bad environments, low level is often drawn high and causes to malfunction by interference in short-term.
Another kind list resistance sampling scheme 2 shown in Figure 2.There are two drawback, electric current I to pass through sampling resistor for this scheme
After R39, then the voltage at the both ends R39 is sent to through resistance R35 and R36 the+IN2 and-IN2 of amplifier (i.e. operational amplification circuit U4),
Amplification voltage is exported by the ends OUT2 after participation operation, is divided into two-way.Amplification voltage enters master chip after resistance R21 all the way,
Carry out real-time sampling.Another way amplifies voltage after resistance R28, participates in comparator U3-8, is compared operation, when by electricity
When hindering negative terminal voltage of the voltage after R28 less than comparator, comparator U3-8 output low levels and the OCP feet for inputing to IPM
(such as：OC feet in Fig. 2), IPM is still normal operating condition；When the voltage after resistance R28 is more than negative terminal voltage
When, comparator U3-8 exports high level and inputs to the OCP feet of IPM, and IPM enters guard mode.Wherein, due to sampling resistor
The voltage at the both ends R39 is very low, without being filtered, is directly sent to amplifier port and carries out operation, in bad working environments down-sampling
Signal interference is larger, the waveform after sampling can be made larger distortion occur, so that current waveform distorts；Second is that adopting
Sample only has positive current protection, that is, when electric current is positive excessive, can normally be protected, but compressor current is just
String wave, exists simultaneously negative current, when negative current occurs excessive, can not effectively be protected.
Embodiment according to the present utility model provides a kind of current protective device, as indicated at 3 the electric current of the utility model
The structural schematic diagram of protective device.The current protective device may include：Sample circuit 1, negative current detection circuit 2 and forward direction
Current detection circuit 3.
In an optional example, the sample circuit 1 can be used for sampling inverse in the affiliated power-supply systems of IPM to be protected
Become the voltage signal of bridge lower bridge arm IGBT emitter currents load on it, obtains sampled voltage.
In an optional example, the negative current detection circuit 2 can be used for detecting whether the sampled voltage surpasses
The negative voltage threshold value of setting is crossed, if the sampled voltage is more than the negative voltage threshold value, starts the negative sense overcurrent of setting
Protection is handled.
Such as：As a result of negative current detection circuit, therefore no matter first overcurrent appears in positive current or bears
Electric current, being capable of effective protection.
Such as：Example shown in Figure 5, the list resistance sampling circuit increase negative electricity current detection functionality, that is,
The negative current detection circuit of R15, R16, R17, U2-A, R18, R19, D2 composition.Negative current is appeared in first overcurrent
When, the case where can be protected in time, avoid the occurrence of overcurrent damage compressor and power device.
Optionally, the negative current detection circuit 2 may include：Second current-limiting resistance (such as：Resistance in Fig. 5
R15), negative sense threshold setting module 10 and first comparator (such as：U2-A in Fig. 5).
In an optional specific example, second current-limiting resistance is connected to output end and the institute of the sampled voltage
Between the inverting input for stating first comparator.
In an optional specific example, when the device can also include operational amplifier circuit 5, second current-limiting resistance,
It is connected between the first output end of the operational amplifier circuit 5 and the inverting input of the first comparator.Such as：Described second
First connecting pin of current-limiting resistance is connect with the first output end of the operational amplifier circuit 5.The second of second current-limiting resistance connects
End is connect, is connect with the inverting input of the first comparator.
In an optional specific example, the negative sense threshold setting module 10 is set to the same of the first comparator
Phase input terminal can be used for setting the negative voltage threshold value.
In an optional specific example, the first comparator, the sampling that can be used for inputting its inverting input
Voltage is compared with the negative voltage threshold value that in-phase input end is set；If the sampled voltage of its inverting input input is super
The negative voltage threshold value is crossed, then exports high level to the control terminal of IPM to be protected, IPM to be protected is protected；If it is anti-
The sampled voltage of phase input terminal input is less than the negative voltage threshold value, then exports low level to the control terminal of IPM to be protected,
Make IPM normal operations to be protected.
Such as：It is partly up that negative current protects circuit, R16 and R17 by partial pressure from R15, generates corresponding protection value,
By the comparison of comparator U2-A, when the voltage after conversion passes through the voltage of partial pressure not higher than R16 and R17, comparator U2-A
Low level is exported, is not in protection phenomenon；When voltage after conversion passes through the voltage of partial pressure higher than R16 and R17, comparator
U2-A exports high level, protection phenomenon occurs.
Being equipped with by current-limiting resistance, negative sense threshold setting module and comparator as a result, realizes that negative current is protected
Shield, it is simple in structure, and reliability is high.
Optionally, the negative current detection circuit 2 can also include：First pull-up resistor (such as：Resistance in Fig. 5
R18) and the second diode (such as：At least one of diode D2 in Fig. 5).
In an optional specific example, first pull-up resistor, be connected to the output end of the first comparator with
In IPM to be protected between the supply voltage of master chip.
Such as：R18 and R19 is pull-up resistor, when comparator is protected all the way for certain, from low level become high level when
It waits, what pull-up resistor can be more quickly and effectively draws high level.
In an optional specific example, the anode of second diode connects with the output end of the first comparator
It connects.The cathode of second diode, connect with the control terminal of IPM to be protected.
Such as：D2, D3 are unilateral diode, it is ensured that forward conduction reversed cut-off simultaneously, if without the two diodes,
When protection signal is drawn high, it can be dragged down by another way, can not be protected because that high level can not occur.
As a result, by pull-up resistor, lift level when negative sense sampled voltage exports high level can be based in comparator and become
Throw-over degree, and then negative sense protective efficacy is promoted, reliability is high.
Optionally, the negative sense threshold setting module 10 may include：Third divider resistance (such as：Resistance in Fig. 5
R16), the 4th divider resistance (such as：Resistance R17 in Fig. 5) and the second filter capacitor (such as：Capacitance C6 in Fig. 5).
In an optional specific example, the third divider resistance is connected to the homophase input of second comparator
End and IPM to be protected in master chip supply voltage between.
In an optional specific example, the 4th divider resistance and second filter capacitor are connected in parallel on described the
Between the in-phase input end and ground of two comparators.
As a result, by the way that negative voltage threshold value is arranged, can rotection thresholds flexibly and be reliably arranged according to actual demand,
And then promote flexibility and the versatility of protection.
In an optional example, the forward current detection circuit 3 can be used for detecting whether the sampled voltage surpasses
The forward voltage threshold of setting is crossed, if the sampled voltage is more than the forward voltage threshold, starts the positive overcurrent of setting
Protection is handled.
Being equipped with by sample circuit, negative current detection circuit and forward current detection circuit as a result, can be right
Inverter bridge lower bridge arm IGBT emitter currents carry out bidirectional protective, and simple in structure, protection in the affiliated power-supply systems of IPM to be protected
Reliability is high.
Optionally, the forward current detection circuit 3 may include：Third current-limiting resistance (such as：Resistance in Fig. 5
R12), positive threshold setting module 11 and the second comparator (such as：U2-B in Fig. 5).
In an optional specific example, the third current-limiting resistance is connected to output end and the institute of the sampled voltage
Between the in-phase input end for stating the second comparator.
In an optional specific example, when the device can also include operational amplifier circuit 5, the third current-limiting resistance,
It is connected between the first output end of the operational amplifier circuit 5 and the in-phase input end of second comparator.Such as：The third
First connecting pin of current-limiting resistance is connect with the first output end of the operational amplifier circuit 5.The second of the third current-limiting resistance connects
End is connect, is connect with the in-phase input end of second comparator.
In an optional specific example, the positive threshold setting module 11 is set to the anti-of second comparator
Phase input terminal can be used for setting the forward voltage threshold.
In an optional specific example, second comparator, the sampling that can be used for inputting its in-phase input end
Voltage is compared with the forward voltage threshold that inverting input is set；If the sampled voltage of its in-phase input end input is super
The forward voltage threshold is crossed, then exports high level to the control terminal of IPM to be protected, IPM to be protected is protected；If it is same
The sampled voltage of phase input terminal input is less than the forward voltage threshold, then exports low level to the control terminal of IPM to be protected,
Make IPM normal operations to be protected.
Such as：It is that positive current protects circuit, R13 and R14 by partial pressure from R12 toward lower part, generates corresponding protection value,
By the comparison of comparator U2-B, when the voltage after conversion passes through the voltage of partial pressure not higher than R13 and R14, comparator U2-B
Low level is exported, is not in protection phenomenon；When voltage after conversion passes through the voltage of partial pressure higher than R13 and R14, comparator
U2-B exports high level, protection phenomenon occurs.
Being equipped with by current-limiting resistance, positive threshold setting module and comparator as a result, realizes that forward current is protected
Shield, it is simple in structure, and reliability is high.
Optionally, at least one of the negative sense overcurrent protection processing, the positive overcurrent protection processing, can wrap
It includes：Turn off the control signal of the control terminal of IPM to be protected.
Pass through the control signal of the control terminal of shutdown IPM to be protected as a result, it is ensured that the safety of IPM when overcurrent
Property, and control mode is easy, reliable.
Optionally, the forward current detection circuit 3 can also include：Second pull-up resistor (such as：Resistance in Fig. 5
R19) and third diode (such as：At least one of diode D3 in Fig. 5).
In an optional specific example, second pull-up resistor, be connected to the output end of second comparator with
In IPM to be protected between the supply voltage of master chip.
In an optional specific example, the anode of the third diode connects with the output end of second comparator
It connects.The cathode of the third diode, connect with the control terminal of IPM to be protected.
As a result, by pull-up resistor, lift level when positive sampled voltage exports high level can be based in comparator and become
Throw-over degree, and then positive protective efficacy is promoted, reliability is high.
Optionally, in the control terminal of IPM to be protected, be additionally provided with the second pull down resistor (such as：Resistance R20 in Fig. 5).Institute
The second pull down resistor is stated, the cathode of second diode and/or the cathode of the third diode are connected to.
Pull down resistor is arranged by the control terminal in IPM to be protected as a result, can better ensure that the control of IPM control terminals
The safety and reliability of signal processed.
Optionally, the positive threshold setting module 11 may include：5th divider resistance (such as：Resistance in Fig. 5
R13), the 6th divider resistance (such as：Resistance R14 in Fig. 5) and third filter capacitor (such as：Capacitance C5 in Fig. 5).
In an optional specific example, the 5th divider resistance is connected to the anti-phase input of second comparator
End and IPM to be protected in master chip supply voltage between.
In an optional specific example, the 6th divider resistance and the third filter capacitor are connected in parallel on described the
Between the inverting input and ground of two comparators.
As a result, by the way that forward voltage threshold is arranged, can rotection thresholds flexibly and be reliably arranged according to actual demand,
And then promote flexibility and the versatility of protection.
In an optional embodiment, can also include：At least one of filter circuit 4 and operational amplifier circuit 5.
In an optional example, the filter circuit 4 can be used for being filtered the sampled voltage.
Such as：Example shown in Figure 4, the list resistance sampling circuit, has carried out sampled signal 1~2 grade of filtering
It handles, that is, the two stage filter circuit that R1, R2, R3, C1, C2 are formed, can interference can effectively be filtered, avoid because of interference
And lead to current waveform Severe distortion.
Such as：Due to having carried out secondary filter processing to sampled signal so that interference component drops to very low in signal, ginseng
It is more nearly actual voltage with the signal of amplifier so that compressor current table waveform is preferable in single resistance sampling circuit.
As a result, by filter circuit, the harmonic signal in the sampled voltage that initial sample obtains can be filtered out, promotes sampling
The purity of voltage, and then promote the accuracy and reliability of bidirectional protective processing.
Optionally, the filter circuit 4 may include：First order filter circuit and second level filter circuit.
Wherein, at least one of the first order filter circuit and the second level filter circuit may include：RC is filtered
Wave circuit.
Such as：Referring to Fig. 4, the first order filter circuit may include：Resistance R2 and capacitance C1.The second level filter
Wave circuit may include：Resistance R3 and capacitance C2.
Such as：Sampled signal is the signal of extremely low voltage, is highly susceptible to interfere in actual circuit, is sampling amplifier
2 grades of filtering are introduced between foot, wherein R2, C1 filters for the first order, and R3, C2 filter for the second level.
As a result, by two stage filter, the accuracy being filtered to sampled voltage and reliability can be promoted.
In an optional example, the operational amplifier circuit 5 (such as：Operational amplifier U1 in Fig. 4), it can be used for institute
It states sampled voltage and carries out operation and/or enhanced processing.
Wherein, the negative current detection circuit 2 and/or the sampling electricity of the forward current detection circuit 3 detection
It presses, may include：Through the filter circuit 4 and/or the operational amplifier circuit 5 treated sampled voltage.
Such as：As shown in figure 4, inverter bridge lower bridge arm IGBT emitter currents I passes through sampling resistor R1, to sampling resistor R1
The voltage at both ends is sampled, by the value of sampling (such as：The voltage that sampling resistor R1 is sampled) it is sent into amplifier U1 (i.e. Fig. 4
In amplifier U1)+IN2 and-IN2 feet.
It, can treated adopts to the sampled voltage that initial sample obtains, or by filter circuit as a result, by operational amplifier circuit
Sample voltage carries out operation and/or enhanced processing, and then provides more accurate and reliable sampled voltage for bidirectional protective circuit, with
Preferably promote reliability and the safety of bidirectional protective.
Wherein, when the device can also include filter circuit 4 and operational amplifier circuit 5, the filter circuit 4 is set to institute
It states between sample circuit 1 and the operational amplifier circuit 5.
Optionally, the sample circuit 1 may include：Sampling resistor.The sampled voltage is the sampling resistor both ends
Voltage.
In an optional specific example, the voltage of the sampling resistor first end is sent into after the filter circuit 4
The operational amplifier circuit 5 the first in-phase input end (such as：The ends+IN2 of U1 in Fig. 4).The voltage of the sampling resistor second end,
Be set adjusting circuit 6 (such as：Resistance R4 and resistance R5 in Fig. 4) be sent into the operational amplifier circuit 5 afterwards the first reverse phase it is defeated
Enter to hold (such as：The ends-IN2 of U1 in Fig. 4).The operational amplifier circuit 5 the first output end (such as：The ends OUT2 of U1 in Fig. 4) it is defeated
Go out the sampled voltage after operation and/or enhanced processing to the negative current detection circuit 2 or forward current detection electricity
Road 3.
Such as：It is combined by the component of optimization so that the waveform of single resistance sampling circuit is very significantly improved, simultaneously
Bidirectional protective circuit overcurrent is protected much sooner.
Being equipped with by sample circuit, filter circuit, operational amplifier circuit and bidirectional protective circuit as a result, it is simple in structure,
And it can guarantee the promptness and reliability of bidirectional protective.
Specifically, when the device can also include adjusting circuit 6, the adjusting circuit 6 may include：First partial pressure
Resistance (such as：Resistance R4 in Fig. 4) and the second divider resistance (such as：Resistance R5 in Fig. 4).The adjusting circuit 6, Ke Yizuo
For a part for operational amplifier circuit 5.
Wherein, first divider resistance and second divider resistance, are connected on the sampling resistor second end and institute
Between the second in-phase input end for stating operational amplifier circuit 5.
Further, the sum of the resistance value of first divider resistance and second divider resistance, with the filter circuit 4
RC filter circuits in filter resistance the sum of resistance value it is equal.
Such as：The sum of the resistance value of resistance R4 and resistance R5 in Fig. 4, can be with the resistance value of resistance R2 and resistance R3 in Fig. 4
It is equal later.
As a result, by adjusting circuit, it can provide for the first inverting input of operational amplifier circuit precisely and reliably input
Voltage, and input mode is easy.
In an optional embodiment, can also include：In feedback circuit 7, bleeder circuit 8 and output circuit 9 extremely
It is one of few.
In an optional example, the feedback circuit 7 (such as：Resistance R6 and/or resistance R7 in Fig. 4), Ke Yiyong
In to being further amplified through 5 operation of the operational amplifier circuit and/or amplified sampled voltage, obtain exporting to the negative sense
The sampled voltage of current detection circuit 2 or the forward current detection circuit 3.
As a result, by feedback circuit, processing structure of the operational amplifier circuit to sampled voltage can be further amplified, promote amplifier
The accuracy and reliability that circuit handles sampled voltage.
Optionally, the feedback circuit 7 may include：First feedback resistance and/or the second feedback resistance.
In an optional specific example, first feedback resistance (such as：Resistance R6 in Fig. 4), it is set to described
Between the second output terminal of operational amplifier circuit 5 and the first inverting input.
In an optional specific example, second feedback resistance (such as：Resistance R7 in Fig. 4), it is set to described
Operational amplifier circuit 5 the second inverting input (such as：The ends-IN1 of U1 in Fig. 4), second output terminal (such as：The OUT1 of U1 in Fig. 4
End) between the first in-phase input end.
Such as：It is corresponding feedback resistance referring to Fig. 4, R6, R7, participates in, by the amplification of sampled voltage, obtaining voltage V1.
It is fed back as a result, by feedback resistance, feedback system is easy, and the reliability of feedback result is high.
In an optional example, the bleeder circuit 8 (such as：Resistance R8, resistance R9 and capacitance C3 in Fig. 4), if
Be placed in the operational amplifier circuit 5 the second in-phase input end (such as：The ends+IN1 of U1 in Fig. 4), it can be used for described to being input to
Sampled voltage in operational amplifier circuit 5 carries out voltage division processing, the main control chip supply voltage of motherboard circuit where obtaining the IPM
Mean voltage.
Such as：Referring to Fig. 4, R8 and R9 by partial pressure, the mean voltage of master chip supply voltage is generated.
As a result, by bleeder circuit, supply voltage can be provided for main control chip in IPM, it is simple in structure, and reliability
Height, safety are good.
In an optional example, the output circuit 9 can be used for after the feedback circuit 7 is further amplified
Sampled voltage be delivered to the IPM where motherboard circuit main control chip in further sampled.
Can be that master chip exports sampled voltage in IPM as a result, by output circuit, it is simple in structure, and export convenience
It is good.
Optionally, the output circuit 9 may include：First current-limiting resistance (such as：Resistance R11 in Fig. 5), first
Pull down resistor (such as：Resistance R10 in Fig. 5), the first filter capacitor (such as：Capacitance C4 in Fig. 5) and the first diode (example
Such as：Diode D1 in Fig. 5).
Wherein, the first connecting pin of first current-limiting resistance, respectively with the first output end of the operational amplifier circuit 5, institute
State the first pull down resistor, the negative current detection circuit 2 and the forward current detection circuit 3 connection.First limit
The second connection end of leakage resistance, it is electric with mainboard where the anode, the first filter capacitor and the IPM of first diode respectively
The sampling end of the main control chip on road connects.
Such as：As shown in figure 5, amplified voltage V1 is after R11, into master chip (such as：It is main where the IPM
The main control chip of plate circuit) it is sampled, there are one a pull down resistor R10 and filter capacitor C4 for this section of process needs.
Here, because control circuit needs to understand IPM working conditions in real time, to adjust the PWM of control in real time, so
The voltage to entering master chip is needed to sample.Wherein, amplified voltage V1 enters the sampling of master chip after R11,
May include：Sampled voltage is fed back into main control chip.
As a result, by the cooperation of current-limiting resistance, pull down resistor, filter capacitor and diode, adopted for master chip output in IPM
Sample voltage, reliability is high, safety is good.
Through a large amount of verification experimental verification, using the technical solution of the present embodiment, by having carried out secondary filter to sampled signal
Processing so that interference component drops to very low in signal, and the signal for participating in amplifier is more nearly actual voltage so that single resistance
Compressor current table waveform is preferable in sample circuit.
Embodiment according to the present utility model additionally provides a kind of compressor circuit corresponding to current protective device.It should
Compressor circuit may include：Above-described current protective device.
Such as：The compressor circuit may include：IPM；Can also include：Above-described current protective device.
Wherein, the current protective device can be used for according to inverter bridge lower bridge arm in the affiliated power-supply systems of the IPM
IGBT emitter currents control the control terminal of the IPM, to be protected to the IPM or keep the IPM normal
Operation.
In an optional embodiment, the embodiment of the utility model is combined so that single resistance by the component of optimization
The waveform of sample circuit is very significantly improved, and simultaneously bi-directionally protects circuit being protected to overcurrent much sooner.
In an optional example, example shown in Figure 4, the list resistance sampling circuit has carried out 1 to sampled signal
~2 grades are filtered, that is, R1, R2, R3, C1, C2 composition two stage filter circuit, can be so that interfering effectively to filter
Fall, avoids leading to current waveform Severe distortion because of interference.
Optionally, as shown in figure 4, inverter bridge lower bridge arm IGBT emitter currents I passes through sampling resistor R1, to sampling resistor
The voltage at the both ends R1 is sampled, by the value of sampling (such as：The voltage that sampling resistor R1 is sampled) be sent into amplifier U1 (scheme
Amplifier U1 in 4)+IN2 and-IN2 feet.
Further, sampled signal is the signal of extremely low voltage, is highly susceptible to interfere in actual circuit, sample
2 grades of filtering are introduced between amplifier foot, wherein R2, C1 filters for the first order, and R3, C2 filter for the second level.
Further, R8 and R9 generates the mean voltage of master chip supply voltage by partial pressure；R6, R7 are corresponding feed back
Resistance participates in, by the amplification of sampled voltage, obtaining voltage V1.
Wherein, it is exactly that master chip generates to the PWM of IPM controls.Current protective device can be the one of circuit board to be controlled
Part, and the master chip is exactly the control chip of the circuit board.
In this way, due to having carried out secondary filter processing to sampled signal so that interference component drops to very low in signal, ginseng
It is more nearly actual voltage with the signal of amplifier so that compressor current table waveform is preferable in single resistance sampling circuit.
In an optional example, example shown in Figure 5, the list resistance sampling circuit increases negative current detection
Function, that is, R15, R16, R17, U2-A, R18, R19, D2 composition negative current detection circuit.Go out in first overcurrent
The case where when present negative current, capable of being protected in time, avoiding the occurrence of overcurrent damage compressor and power device.
Optionally, as shown in figure 5, amplified voltage V1 is sampled after R11 into master chip, this section of process
A pull down resistor R10 and filter capacitor C4 there are one needing.
Wherein, master chip is sampled ", may include：Sampled voltage is fed back into main control chip, because control circuit needs
IPM working conditions are understood in real time, to adjust the PWM of control in real time.
Optionally, it is that positive current protects circuit, R13 and R14 by partial pressure from R12 toward lower part, generates corresponding protection
Value, by the comparison of comparator U2-B, when the voltage after conversion passes through the voltage of partial pressure not higher than R13 and R14, comparator
U2-B exports low level, is not in protection phenomenon；When voltage after conversion passes through the voltage of partial pressure higher than R13 and R14, than
High level is exported compared with device U2-B, protection phenomenon occurs.
Wherein, the protection phenomenon of positive negative sense may include：Compressor current is similar sine wave, has positive half and bears
Half part, the protection value that can be arranged refer to the absolute value in mathematics, such as：Setting 20A is protection value, previous positive electricity
Stream protection refers to that electric current is protected when being more than 20A, and less than -20A when cannot be protected, and bidirectional protective be exactly -20A~20A with
It just protects outer part.
Optionally, it is partly up that negative current protects circuit, R16 and R17 by partial pressure from R15, generates corresponding protection
Value, by the comparison of comparator U2-A, when the voltage after conversion passes through the voltage of partial pressure not higher than R16 and R17, comparator
U2-A exports low level, is not in protection phenomenon；When voltage after conversion passes through the voltage of partial pressure higher than R16 and R17, than
High level is exported compared with device U2-A, protection phenomenon occurs.
Optionally, R18 and R19 is pull-up resistor, when comparator is protected all the way for certain, becomes high level from low level
When, what pull-up resistor can be more quickly and effectively draws high level.
Optionally, D2, D3 are unilateral diode, it is ensured that forward conduction reversed cut-off simultaneously, if without the two diodes,
Then when protection signal is drawn high, it can be dragged down by another way, can not be protected because that high level can not occur.
In this way, as a result of negative current detection circuit, therefore no matter first overcurrent appears in positive current or bears
Electric current, being capable of effective protection.
The processing and function realized by the compressor circuit of the present embodiment essentially correspond to earlier figures 4 to shown in Fig. 5
Current protective device embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to aforementioned reality
The related description in example is applied, this will not be repeated here.
Through a large amount of verification experimental verification, using the technical solution of the utility model, by increasing negative current detection circuit, in conjunction with
Positive electricity current detection circuit, no matter first overcurrent appears in positive current or negative current, being capable of effective protection.
Embodiment according to the present utility model additionally provides a kind of electricity of compressor circuit corresponding to current protective device
Flow guard method.The current protection method of the compressor circuit may include：
(1) it by the sample circuit 1, samples inverter bridge lower bridge arm IGBT in the affiliated power-supply systems of IPM to be protected and emits
The voltage signal of electrode current load on it, obtains sampled voltage.
(2) by the negative current detection circuit 2, detect whether the sampled voltage is more than the negative voltage threshold set
Value starts the negative sense overcurrent protection processing of setting if the sampled voltage is more than the negative voltage threshold value.
(3) by the forward current detection circuit 3, can be used for detecting whether the sampled voltage is more than to set just
To voltage threshold, if the sampled voltage is more than the forward voltage threshold, start the positive overcurrent protection processing of setting.
Being equipped with by sample circuit, negative current detection circuit and forward current detection circuit as a result, can be right
Inverter bridge lower bridge arm IGBT emitter currents carry out bidirectional protective, and simple in structure, protection in the affiliated power-supply systems of IPM to be protected
Reliability is high.
Before the processing and function realized by the current protection method of the compressor circuit of the present embodiment are essentially corresponded to
State the embodiment, principle and example of compressor circuit, therefore not detailed place in the description of the present embodiment, it may refer to aforementioned implementation
Related description in example, this will not be repeated here.
Through a large amount of verification experimental verification, using the technical solution of the utility model, by making amplified sampled voltage pass through
It is sampled into master chip after current-limiting resistance, while connecting positive current protection circuit and negative current protection circuit, reversal
Protect circuit rear end that pull-up resistor is set, it is ensured that stability；It solves to appear in negative electricity in first overcurrent of compressor circuit
The problem of can not being protected in time when stream, reaches the technique effect that can be protected much sooner to overcurrent.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only the embodiments of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the right of the utility model.
Claims (9)
1. a kind of current protective device, which is characterized in that including：Sample circuit (1), negative current detection circuit (2) and forward direction
Current detection circuit (3)；Wherein,
The sample circuit (1), for sampling inverter bridge lower bridge arm IGBT emitter currents in the affiliated power-supply systems of IPM to be protected
The voltage signal of load on it, obtains sampled voltage；
The negative current detection circuit (2), for detecting whether the sampled voltage is more than the negative voltage threshold value set, if
The sampled voltage is more than the negative voltage threshold value, then starts the negative sense overcurrent protection processing of setting；
The forward current detection circuit (3), for detecting whether the sampled voltage is more than the forward voltage threshold set, if
The sampled voltage is more than the forward voltage threshold, then starts the positive overcurrent protection processing of setting.
2. the apparatus according to claim 1, which is characterized in that further include：In filter circuit (4) and operational amplifier circuit (5)
At least one；Wherein,
The filter circuit (4), for being filtered to the sampled voltage；And/or
The operational amplifier circuit (5), for carrying out operation and/or enhanced processing to the sampled voltage；
Wherein, the sampling electricity of the negative current detection circuit (2) and/or the forward current detection circuit (3) detection
Pressure, including：Through the filter circuit (4) and/or the operational amplifier circuit (5) treated sampled voltage.
3. the apparatus of claim 2, which is characterized in that wherein,
When the device further includes filter circuit (4) and operational amplifier circuit (5), the filter circuit (4) is set to the sampling electricity
Between road (1) and the operational amplifier circuit (5)；
The sample circuit (1), including：Sampling resistor；The sampled voltage is the voltage at the sampling resistor both ends；Wherein,
The voltage of the sampling resistor first end is sent into the first same phase of the operational amplifier circuit (5) after the filter circuit (4)
Input terminal；The voltage of the sampling resistor second end, the adjusting circuit (6) being set are sent into the of the operational amplifier circuit (5) afterwards
One inverting input；First output end of the operational amplifier circuit (5) exports the sampled voltage after operation and/or enhanced processing extremely
The negative current detection circuit (2) or the forward current detection circuit (3)；
And/or
The filter circuit (4), including：First order filter circuit and second level filter circuit；Wherein,
At least one of the first order filter circuit and the second level filter circuit, including：RC filter circuits.
4. the apparatus of claim 2, which is characterized in that further include：Feedback circuit (7), bleeder circuit (8) and output
At least one of circuit (9)；Wherein,
The feedback circuit (7), for through the operational amplifier circuit (5) operation and/or amplified sampled voltage into advancing one
Step amplification, obtains exporting the sampled voltage to the negative current detection circuit (2) or the forward current detection circuit (3)；
And/or
The bleeder circuit (8), is set to the second in-phase input end of the operational amplifier circuit (5), for being input to the fortune
Sampled voltage in electric discharge road (5) carries out voltage division processing, the main control chip supply voltage of motherboard circuit where obtaining the IPM
Mean voltage；
And/or
The output circuit (9) is described for being delivered to the sampled voltage after the feedback circuit (7) is further amplified
It is further sampled in the main control chip of motherboard circuit where IPM.
5. device according to claim 4, which is characterized in that wherein,
When the device further includes adjusting circuit (6), the adjusting circuit (6), including：First divider resistance and the second partial pressure electricity
Resistance；
When the sample circuit (1) includes sampling resistor, first divider resistance and second divider resistance are connected on
Between the sampling resistor second end and the second in-phase input end of the operational amplifier circuit (5)；
Wherein, the sum of the resistance value of first divider resistance and second divider resistance is filtered with the RC of the filter circuit (4)
The sum of resistance value of filter resistance is equal in wave circuit；
And/or
The feedback circuit (7), including：First feedback resistance and/or the second feedback resistance；Wherein,
First feedback resistance is set between the second output terminal and the first inverting input of the operational amplifier circuit (5)；
It is same to be set to the second inverting input of the operational amplifier circuit (5), second output terminal and first for second feedback resistance
Between phase input terminal；
And/or
The output circuit (9), including：First current-limiting resistance, the first pull down resistor, the first filter capacitor and the first diode；
Wherein,
First connecting pin of first current-limiting resistance, respectively under the first output end of the operational amplifier circuit (5), described first
Pull-up resistor, the negative current detection circuit (2) and the forward current detection circuit (3) connection；The first current limliting electricity
The second connection end of resistance, respectively with motherboard circuit where the anode, the first filter capacitor and the IPM of first diode
The sampling end of main control chip connects.
6. according to the device described in one of claim 1-5, which is characterized in that the negative current detection circuit (2), including：
Second current-limiting resistance, negative sense threshold setting module (10) and first comparator；Wherein,
Second current-limiting resistance, be connected to the output end of the sampled voltage and the first comparator inverting input it
Between；
Wherein, when the device further includes operational amplifier circuit (5), second current-limiting resistance is connected to the operational amplifier circuit (5)
Between first output end and the inverting input of the first comparator；
The negative sense threshold setting module (10), is set to the in-phase input end of the first comparator, described negative for setting
To voltage threshold；
The first comparator, the negative sense of sampled voltage and in-phase input end setting for being inputted to its inverting input
Voltage threshold is compared；
If the sampled voltage of its inverting input input is more than the negative voltage threshold value, high level is exported to IPM to be protected
Control terminal, IPM to be protected is protected；
If the sampled voltage of its inverting input input is less than the negative voltage threshold value, low level is exported to be protected
The control terminal of IPM makes IPM normal operations to be protected；
And/or
The forward current detection circuit (3), including：Third current-limiting resistance, positive threshold setting module (11) and second compare
Device；Wherein,
The third current-limiting resistance, be connected to the output end of the sampled voltage and second comparator in-phase input end it
Between；
Wherein, when the device further includes operational amplifier circuit (5), the third current-limiting resistance is connected to the operational amplifier circuit (5)
Between first output end and the in-phase input end of second comparator；
The positive threshold setting module (11), is set to the inverting input of second comparator, for set it is described just
To voltage threshold；
Second comparator, the forward direction of sampled voltage and inverting input setting for being inputted to its in-phase input end
Voltage threshold is compared；
If the sampled voltage of its in-phase input end input is more than the forward voltage threshold, high level is exported to IPM to be protected
Control terminal, IPM to be protected is protected；
If the sampled voltage of its in-phase input end input is less than the forward voltage threshold, low level is exported to be protected
The control terminal of IPM makes IPM normal operations to be protected；
And/or
At least one of the negative sense overcurrent protection processing, the positive overcurrent protection processing, including：Turn off IPM to be protected
Control terminal control signal.
7. device according to claim 6, which is characterized in that the negative current detection circuit (2) further includes：First
At least one of pull-up resistor and the second diode；Wherein,
First pull-up resistor is connected to the power supply electricity of the output end and master chip in IPM to be protected of the first comparator
Between pressure；And/or
The anode of second diode, connect with the output end of the first comparator；The cathode of second diode, with
The control terminal of IPM to be protected connects；
And/or
The forward current detection circuit (3) further includes：At least one of second pull-up resistor and third diode；Wherein,
Second pull-up resistor is connected to the power supply electricity of the output end and master chip in IPM to be protected of second comparator
Between pressure；And/or
The anode of the third diode is connect with the output end of second comparator；The cathode of the third diode, with
The control terminal of IPM to be protected connects.
8. device according to claim 7, which is characterized in that in the control terminal of IPM to be protected, be additionally provided with the second drop-down electricity
Resistance；Second pull down resistor is connected to the cathode of second diode and/or the cathode of the third diode；
And/or
The negative sense threshold setting module (10), including：Third divider resistance, the 4th divider resistance and the second filter capacitor；Its
In,
The third divider resistance is connected to the confession of the in-phase input end and master chip in IPM to be protected of second comparator
Between piezoelectric voltage；
4th divider resistance and second filter capacitor are connected in parallel on the in-phase input end and ground of second comparator
Between；
And/or
The positive threshold setting module (11), including：5th divider resistance, the 6th divider resistance and third filter capacitor；Its
In,
5th divider resistance is connected to the confession of the inverting input and master chip in IPM to be protected of second comparator
Between piezoelectric voltage；
6th divider resistance and the third filter capacitor are connected in parallel on the inverting input and ground of second comparator
Between.
9. a kind of compressor circuit, which is characterized in that including：Current protective device as described in any one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721701252.2U CN207967917U (en) | 2017-12-08 | 2017-12-08 | A kind of current protective device and compressor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721701252.2U CN207967917U (en) | 2017-12-08 | 2017-12-08 | A kind of current protective device and compressor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207967917U true CN207967917U (en) | 2018-10-12 |
Family
ID=63728961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721701252.2U Withdrawn - After Issue CN207967917U (en) | 2017-12-08 | 2017-12-08 | A kind of current protective device and compressor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207967917U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054728A (en) * | 2017-12-08 | 2018-05-18 | 珠海格力电器股份有限公司 | A kind of current protective device, compressor circuit and its current protection method |
-
2017
- 2017-12-08 CN CN201721701252.2U patent/CN207967917U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054728A (en) * | 2017-12-08 | 2018-05-18 | 珠海格力电器股份有限公司 | A kind of current protective device, compressor circuit and its current protection method |
| CN108054728B (en) * | 2017-12-08 | 2023-06-06 | 珠海格力电器股份有限公司 | Current protection device, compressor circuit and current protection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108054728A (en) | A kind of current protective device, compressor circuit and its current protection method | |
| CN206096314U (en) | Power failure detection system and electric meter system | |
| CN203026904U (en) | Over-current protection circuit and PFC (power factor correction) control circuit with same | |
| WO2015165286A1 (en) | Relay protection method and device against lc parallel circuit detuning faults | |
| CN207198238U (en) | Mains frequency detects circuit | |
| CN103022976B (en) | A kind of frequency converter output short circuit protection circuit and guard method | |
| CN207117167U (en) | A kind of power device circuit with overcurrent protection function | |
| CN201829928U (en) | Main circuit backwards flowing protection device of uninterruptible power supply and uninterruptible power supply adopting same | |
| CN207398834U (en) | A kind of series voltage compensation device based on Power Electronic Technique | |
| CN103675421A (en) | Power burr signal detection circuit and detection method thereof | |
| CN209690401U (en) | A kind of alternating voltage DC component detection circuit | |
| CN207967917U (en) | A kind of current protective device and compressor circuit | |
| CN106532627A (en) | Current projection circuit and system | |
| CN105244849B (en) | A kind of method and apparatus of the overcurrent protection of IGCT rectifier | |
| CN107154632A (en) | A kind of recognition methods of power unit by-pass state | |
| CN102005912B (en) | Double overcurrent protection circuit of sine wave inverter | |
| CN105067927A (en) | Servo driver brake resistor loop detection method | |
| CN103063978A (en) | Detection method and device for short circuit | |
| CN206773162U (en) | Frequency converter status monitoring circuit and the frequency converter comprising the circuit | |
| CN106249022B (en) | The analysis system and method that exchange transient voltage influences DC control and protection system | |
| CN103245872B (en) | AC fuse condition checkout gear | |
| CN104730363B (en) | A kind of filter detection method and apparatus | |
| CN205225938U (en) | Hydraulic system's alarm | |
| CN102866278A (en) | Output voltage detecting circuit for frequency changer and frequency changer | |
| CN204498101U (en) | The alternating current-direct current self adaptation of microcomputer protecting device opens entry loop |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20230606 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20230606 |