CN106532627A - Current protection circuit and system - Google Patents
Current protection circuit and system Download PDFInfo
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- CN106532627A CN106532627A CN201611143625.9A CN201611143625A CN106532627A CN 106532627 A CN106532627 A CN 106532627A CN 201611143625 A CN201611143625 A CN 201611143625A CN 106532627 A CN106532627 A CN 106532627A
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- 230000001012 protector Effects 0.000 claims abstract description 67
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 8
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention provides a current protection circuit and a current protection system comprising the same, which are used for realizing overcurrent protection of a compressor and the like so as to prevent the problem of damage to a module, a mainboard and the like caused by overlarge current. The current protection circuit includes: the circuit comprises a sampling resistor, an operational amplifier circuit, a gating circuit, a negative half-cycle protector and a positive half-cycle protector; the sampling resistor is used for sampling phase current; the operational amplifier circuit is used for amplifying the sampled current; the gating circuit is connected between the output end of the operational amplifier circuit and the input ends of the negative half-cycle protector and the positive half-cycle protector; the negative half-cycle protector is used for comparing the negative half-cycles of the amplified current so as to realize the protection of the negative half-cycles of the phase current; and the positive half-cycle protector is used for comparing the positive half-cycle of the amplified current, so that the positive half-cycle of the phase current is protected.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of current protecting circuit and including current protection electricity
The current protection system on road.
Background technology
Core devices of the compressor as air-conditioner, need to carry out overcurrent protection in operation, and to prevent, electric current is excessive to be caused
The problems such as module damage, mainboard are damaged.Although there is current protecting circuit in prior art, in this current protecting circuit,
Differential amplifier circuit connects bus, and for gathering the transient current on bus, is further divided into two-way process, leads up to RC integrations
Circuit is fed through processor, and the processor gathers the average current of bus, when processing to reduce by reduction of speed more than setting value
Load；Another road enters directly into comparator, and the comparator is protected when exceeding for which is compared with setting electric current protection electricity
Produce excessively stream to interrupt during point.However, this current protecting circuit is only used for the part for protecting compressor current, it is impossible to play
Complete protective effect.
The content of the invention
In view of this, the present invention provides a kind of current protecting circuit and the current protection system including the current protecting circuit
System, for realizing the overcurrent protection to compressor etc., so as to prevent asking for the damages such as electric current excessive caused module, mainboard
Topic.
According to the first aspect of the invention, there is provided a kind of current protecting circuit, including：
Sampling resistor, discharge circuit, gating circuit, negative half period protector and positive half cycle protector；
The sampling resistor is for sampling to phase current；
The discharge circuit, for amplifying the electric current sampled and obtain；
The gating circuit is connected to the output end of discharge circuit and the input of negative half period protector and positive half cycle protector
Between end；
Negative half period protector, for being compared to the negative half period of the electric current after amplification, so as to realize bearing to phase current
The protection of half cycle；And
The positive half cycle protector, for being compared to the positive half cycle of the electric current after amplification, so as to realize to phase current
Positive half cycle protection.
Preferably, described current protecting circuit also includes：
Biasing circuit, is connected to the end in the same direction of discharge circuit, for lifting the output of the discharge circuit.
Preferably, the gating circuit includes positive half cycle clamping unit, and the output and positive half cycle for being connected to discharge circuit is protected
Between shield device, for the output of discharge circuit is sent to positive half cycle protector, to realize the protection to positive half cycle current.
Preferably, the positive half cycle clamping unit is clamp diode, the output end of its negative electrode connection discharge circuit,
Anode is connected to positive half cycle protector.
Preferably, the gating circuit also includes negative half period clamping unit, is connected to output and the negative half period of discharge circuit
Between protector, for the output of discharge circuit is sent to negative half period protector, to realize the protection to negative half-cycle current.
Preferably, the negative half period clamping unit includes the first diode, and the anode connection of first diode is described
The output end of discharge circuit, negative electrode are connected to negative half period protector NH.
Preferably, the negative half period protector includes first comparator, and its backward end connects the another of the gating circuit
End, holds input setting value in the same direction.
The positive half cycle protector also includes the 5th resistance and the 6th resistance, and the 5th resistance is connected to supply voltage
(Vcc) and the backward end of second comparator between, the 6th resistance be connected to second comparator backward end and
Between ground, initial voltage is set for the backward end to second comparator.
Preferably, the negative half period protector includes first comparator, and its backward end connects the negative electrode of the first diode, together
To end input setting value,
Preferably, the negative half period protector also includes first resistor and second resistance；
First resistor is connected between the other end and backward end of the gating circuit, second resistance be connected to backward end with
Between ground.
Preferably, the positive half cycle protector includes the second comparator, and its backward end connects the another of the gating circuit
End, holds input setting value in the same direction.
Preferably, the biasing circuit includes the first biasing resistor and the second biasing resistor；
First biasing circuit be connected to and the end in the same direction of discharge circuit between；And second biasing resistor be connected to amplifier
Between the end in the same direction of circuit and supply voltage (Vcc).
Preferably, the current protecting circuit is used for the protection of three phase mains electric current；
The sampling resistor includes the first to the 3rd sampling resistor, is respectively used to sample three phase mains electric current；
The discharge circuit includes the first to the 3rd discharge circuit, is respectively used to sample the first to the 3rd sampling resistor
To electric current be amplified；And
The gating circuit includes the first to the 3rd gating branch road, is connected to the output of the first to the 3rd discharge circuit
Between end and negative half period protector and positive half cycle protector.
Preferably, the described first to the 3rd gating branch road includes the first to the 3rd negative half period clamping unit and first respectively
To the 3rd positive half cycle clamping unit；
First to the 3rd negative half period clamping unit be connected to the first to the 3rd discharge circuit and negative half period protector it
Between, for filtering out the maximum of three discharge circuit outputs；
First to the 3rd positive half cycle clamping unit is connected between the first to the 3rd discharge circuit and positive half cycle protector, is used
In the minimum of a value for filtering out three discharge circuit outputs.
Preferably, the first to the 3rd negative half period clamping unit is the first to the 3rd diode, anode connection discharge circuit
Output end, negative electrode connection negative half period protector；
First to the 3rd positive half cycle clamping unit be the first to the 3rd clamp diode, negative electrode connect discharge circuit output
End, anode connection negative half period protector.
According to the second aspect of the invention, there is provided a kind of current protection system, including：
SPM；The described current protecting circuit of any of the above-described；And control unit；
The phase current of SPM output is processed by the current protecting circuit；
The first and/or second comparator in the current protecting circuit overturns and exports overcurrent protection signal to described
Can only power model, the SPM output alarm signal to described control unit, control unit thus stop output drive
Dynamic signal.
Preferably, described control unit is directly sampled to the output signal of the discharge circuit simultaneously, and and storage inside
Setting value be compared, to realize the duplicate protection of electric current.
Scheme of the invention, described current protecting circuit can realize the complete positive positive half cycle to the phase current
And the protection of negative half period such that it is able to provide more reliable current protecting circuit so that be effectively protected module and the master of electrical equipment
Plate will not be damaged as electric current is excessive.Meanwhile, due to there is the dual of hardware and software simultaneously in the current protection system
Protect and cause current protecting function relatively reliable.
Further detailed description is done to technical scheme below in conjunction with the drawings and the specific embodiments, the present invention
Beneficial effect will be further appreciated.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, is used for
The present invention is explained, inappropriate limitation of the present invention is not constituted.
Fig. 1 shows the circuit of the circuit block diagram and its specific embodiment according to current protecting circuit of the present invention
Figure.
Fig. 2 is shown according to the protection circuit for being applied to three-phase power circuit of the present invention.
Fig. 3 shows a preferred embodiment of the current protection system.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Corresponding accompanying drawing is clearly and completely described to technical solution of the present invention.Obviously, described embodiment is only the present invention one
Section Example, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
The every other embodiment obtained under the premise of going out creative work, belongs to the scope of protection of the invention.
Illustrate the current protecting circuit of one embodiment of the present invention first with reference to Fig. 1.Fig. 1 is shown according to institute of the present invention
The circuit diagram of the circuit block diagram and its specific embodiment of the current protecting circuit stated.As shown in figure 1, the current protecting circuit
Including：Sampling resistor RS1, discharge circuit OP, gating circuit CL, negative half period protector NH and positive half cycle protector PH.It is described
Sampling resistor RS1 for sampling to phase current, to realize current protecting function.The discharge circuit OP, for amplifying
The electric current for obtaining of sampling.The gating circuit CL is connected to the output end of discharge circuit OP and negative half period protector NH and just
Between the input of half cycle protector PH, for the output of discharge circuit is input into positive half cycle protector and negative half period protection respectively
Device.Negative half period protector NH, for being compared to the negative half period of the electric current after amplification, so as to realize the negative half period to phase current
Overcurrent protection.The positive half cycle protector PH, for being compared to the positive half cycle of the electric current after amplification, so as to realize to phase
The overcurrent protection of the positive half cycle of electric current.
Preferably, the current protecting circuit also includes biasing circuit BI, is connected to the end in the same direction of discharge circuit OP, is used for
Lift the output of the discharge circuit OP.Thus, by the output of discharge circuit OP is lifted to certain value, so that institute
State the current signal of the sampling can completely after operation amplifier to embody on output voltage, with realize more accurately detection and
More reliable current protection.
Constituted by foregoing circuit, current protecting circuit of the present invention can be realized to the complete of the phase current
The protection of positive half cycle and negative half period such that it is able to provide more reliable current protecting circuit so that be effectively protected the mould of electrical equipment
Block and mainboard will not be damaged as electric current is excessive.
Hereinafter each several part and its course of work of the current protecting circuit are described in detail.Sampling resistor RS1 connects
It is connected on such as bus of power supply to be protected, for sampling to phase current thereon.The signal input that sampling is obtained is to fortune
The backward end of the operational amplifier in electric discharge road OP, for being amplified to the electric current that sampling is obtained.
The gating circuit preferably includes positive half cycle clamping unit, and for example, clamp diode D4 is connected to discharge circuit
Between the output of OP and positive half cycle protector, for the output of discharge circuit is sent to positive half cycle protector, to realize aligning
The protection of half cycle electric current.Specifically, the negative electrode negative electrode of the clamp diode D4 connects the output end of the discharge circuit, anode
It is connected to positive half cycle protector PH.It is pointed out that the positive half cycle clamping unit can also be not limited to adopt clamp diode,
Other circuits that transistor circuit etc. can realize identical function may also be employed.
It is further preferred that the gating circuit also includes negative half period clamping unit, for example, diode D1 is connected to fortune
Between the output of electric discharge road OP and negative half period protector, for the output of discharge circuit is sent to negative half period protector, with reality
The now protection to negative half-cycle current.The negative half period clamping unit is embodied as one includes the first diode D1, described first
The anode of diode D1 connects the output end of the discharge circuit, and negative electrode is connected to negative half period protector NH.Similar, it is described negative
Half cycle clamping unit can also be not limited to the diode, and other circuits that triode etc. can realize identical function may also be employed.
The negative half period protector NH includes first comparator comp1, and its backward end connects the another of the gating circuit CL
One end, holds input setting value in the same direction.When the negative half period of electric current to be protected reaches protection value, the output of first comparator comp1
Upset.In side specific embodiment shown in Fig. 1, the negative electrode of the first diode D1 is connected to the backward end of first comparator comp1,
So as to the negative half period of the electric current for obtaining sampling is input to the backward end of the comparator.Further, for the ease of hardware pair
Current reference value is adjusted, setting first resistor R4 and second resistance R5 on the backward end of first comparator comp1, and first
Resistance R4 is connected between the other end of gating circuit and backward end, and second resistance R5 is connected between backward end and ground.More enter
One step ground, arranges the three, the 4th resistance R6, R7 at the end in the same direction of first comparator comp1, and wherein 3rd resistor R6 is connected to confession
Between piezoelectric voltage Vcc voltage and end in the same direction, the 4th resistance R7 is connected in the same direction between end and ground, so as to form setting value.When negative
When the electric current of half cycle exceedes protection value, the output switching activity of comparator comp1.
The positive half cycle protector PH includes the second comparator comp2, and its backward end connects the another of the gating circuit CL
One end, holds input setting value in the same direction.When the positive half cycle of electric current to be protected reaches protection value, the output of the second comparator comp2
Upset.Preferably, in order to the backward end in the second comparator comp2 arranges an initial voltage, connect the 5th, the in backward end
Six resistance R8, R10, wherein, the 5th resistance R8 is connected between Vcc and backward end, and the 6th resistance R10 is connected to backward end and ground
Between, so, by the partial pressure of the five, the 6th resistance R8, R10, one is input into initially in the backward end of the second comparator comp2
Value.And further, the setting value that the second comparator comp2 is held in the same direction is by Vcc by the seven, the 8th resistance R9 and R11 points
Pressure is obtained, i.e., between the 7th resistance R9 is connected to Vcc and holds in the same direction, the 8th resistance R11 is connected to.Just half
When all electric currents are not up to protection value, reverse terminal voltage Ud is determined by R8 and R10 partial pressures by Vcc, and Ud is higher than reverse terminal voltage
Uc.When positive half cycle current reaches protection value, the conducting of positive half cycle clamping unit, such as clamp diode D4, Ud is pulled down to low
In Uc, then the output switching activity of the second comparator comp2.In another preferred embodiment, the 6th resistance R10 is not provided with,
So, at this, reverse terminal voltage adds diode drop equal to the output voltage of discharge circuit OP.As long as electric current to be protected is just
To value (positive half cycle current) less than protection value, the voltage Ud of the backward end of the second comparator comp2 is higher than its forward end
Setting value, when positive half cycle current reaches protection value, Ud becomes lower, low to less than Uc, the then output of the second comparator comp2
Upset.It should be noted that the setting of above-mentioned each resistance is merely illustrative, for example, above-mentioned first and second comparator output
High and low level can be adjusted by exchanging the position of setting voltage and the output voltage of discharge circuit.
The biasing circuit BI is connected to the end in the same direction of the discharge circuit OP, for lifting the output of discharge circuit OP.
In a preferred embodiment, the end in the same direction adds a direct current biasing by first and second biasing resistor R12 and Ra by Vcc, i.e.,
First biasing resistor R12 be connected between the end in the same direction, the second biasing resistor Ra is connected in the same direction between end and Vcc.
In another embodiment shown in Fig. 1, the second biasing resistor Ra be connected in the same direction end and an operational amplifier op4 output end it
Between, Vcc is added to the end in the same direction of operational amplifier op4 (voltage follower), the output of operational amplifier op4 after electric resistance partial pressure
Discharge circuit OP is added to by electric resistance partial pressure again such that it is able to make the voltage for being input to discharge circuit OP in-phase ends more stable.
By the output of discharge circuit is lifted to certain value, so that sampled signal can completely after amplifier is embodied to output
On voltage, to guarantee the realization of secondary half cycle current protecting function.
The course of work of the current protecting circuit shown in Fig. 1 is below described.
First, sampling resistor Rs1 samples to phase current to be protected, and the sampled signal for obtaining is input to discharge circuit
The end of oppisite phase of OP.When the current protecting circuit includes the biasing circuit BI, the in-phase end of the discharge circuit OP is by Vcc
One direct current biasing is added by first and second biasing resistor Ra and R12, so as to the output of amplifier is lifted to certain value, is made
Obtain sampled signal can completely after discharge circuit to embody on output voltage.
Current protection value is adjusted for the ease of hardware, first and second is arranged in the end of oppisite phase of first comparator comp1
Resistance R4 and R5, carry out partial pressure to the output voltage of discharge circuit OP and obtain Ua, and Ua is input to the reverse of first comparator comp1
End.On the other hand, supply voltage Vcc by the three, the 4th resistance R6 and R7 carry out partial pressure to Ub, Ub is added to first comparator
The end in the same direction of comp1.When the electric current of electric current negative half period reaches protection value, the output switching activity of first comparator comp1 sent
Current signal (OC signals).
Positive half cycle current defencive function is realized by positive half cycle protector.Setting value Uc by Vcc pass through the five, the six resistance R9 and
R11 partial pressures are obtained, and when positive half cycle current is not up to protection value, reverse terminal voltage Ud passes through the seven, the eight resistance R8 and R10 by Vcc
Partial pressure determines that Ud is higher than Uc, and when positive half cycle current reaches protection value, now clamp diode D4 conductings, Ud are pulled low, then
The output switching activity of comp2；Or the 8th resistance R10 is not provided with, cause to be not up to protection value in positive half cycle current by arranging Uc
When, Ud is higher than Uc, and when positive half cycle current reaches protection value, Ud becomes lower, low to be less than Uc to Ud, then the output of comp2 is turned over
Turn, send overcurrent signal (OC signals).
It is illustrated as a example by applying in single phase power circuits to the current protecting circuit above.It is of the present invention
Protection circuit applies also for three-phase power circuit.Fig. 2 is shown according to the three-phase power circuit of being applied to of the present invention
Protection circuit.As shown in Fig. 2 in the current protecting circuit of the three-phase power circuit, including:For gathering the of each phase current
One to the 3rd sampling resistor RS1-RS3, for sample signal be amplified, including the first to the 3rd discharge circuit OP1-
The discharge circuit OP of OP3, respectively by first and second biasing resistor R12, Ra, third and fourth biasing resistor R22, Rb, and the five, the six
The biasing circuit BI of biasing resistor R32, Rc composition, by negative half period clamping unit (the first to the 3rd diode D1-D3) and just
Gating circuit CL that half cycle clamping unit (the first to the 3rd clamp diode D4-D6) is constituted and first comparator comp1 and
Second comparator comp2.The function of each circuit will not be described here with identical described in above-mentioned single-phase circuit.
In the specific embodiment shown in Fig. 2, the negative half period clamping unit, i.e., first to the 3rd diode D1, D2 and
The effect of D3 is the maximum for filtering out three discharge circuit outputs, and synchronization only one of which diode can be turned on, corresponding
The output voltage signal of discharge circuit can be imported into first comparator comp1 circuit, if the voltage signal exceedes setting value,
The then output switching activity of first comparator comp1.Similar, the effect of first to the 3rd clamp diode D4, D5 and D6 is to screen
Go out the minimum of a value of three discharge circuits output, also only one of which diode can be turned on synchronization, corresponding discharge circuit it is defeated
Go out voltage signal and can be imported into the second comparator comp2 circuits, if the voltage signal is less than setting value, the second comparator
The output switching activity of comp2.
The protection system comprising above-mentioned current protecting circuit of the present invention is illustrated below in conjunction with Fig. 3.Fig. 3 shows the guarantor
One preferred embodiment of protecting system.As shown in figure 3, the system includes：Intelligent power module, above-mentioned current protecting circuit
And control unit MCU.Intelligent power module is exported each phase current and is sampled by current sampling circuit, sampled signal
It is amplified through rear class amplifier, and can preferably increases the voltage signal of direct current biasing；Tri- tunnel amplifiers of gating circuit Hui Ba
The maximum and minimum of a value of circuit is screened, and is input to first and second comparator circuit, is set with first comparator comp1 respectively
The minimum of a value of fixed maximum and the second comparator comp2 settings is compared.No matter maximum is exceeded again below minimum of a value,
Comparator upset exports the signal of an overcurrent protection to IPM, and IPM detects the overcurrent signal (OC, over current
Signal) after can send alarm signal, such as fault output signal (FO：Fault output) to control unit MCU.MCU is received
After the alarm signal, output drive signal can be stopped, and take necessary safeguard measure.Further MCU can also be to discharge circuit
The voltage signal of output is directly sampled, and is compared with the setting value of software inhouse storage, such that it is able to accomplish duplicate protection,
So that current protection system is more safe and reliable.
Additionally, current protecting circuit of the present invention and current protection system can be used not only for compressor protection, also
Can be used for the current protection of various inverter circuits.
Above the current protecting circuit and the current protection system comprising the circuit of the present invention are described.According to this
The scheme of invention, described current protecting circuit can realize the complete positive positive half cycle to the phase current and the guarantor of negative half period
Shield such that it is able to provide more reliable current protecting circuit so that the module and mainboard for being effectively protected electrical equipment will not be due to electricity
Flow through big and be damaged.Meanwhile, the current protection system causes electricity due to the duplicate protection that there is hardware and software simultaneously
Stream defencive function is relatively reliable.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, equivalent
Replace, improve etc., should be included within the scope of the present invention.
Claims (16)
1. a kind of current protecting circuit, it is characterised in that include：
Sampling resistor, discharge circuit, gating circuit, negative half period protector and positive half cycle protector；Wherein,
The sampling resistor is for sampling to phase current；
The discharge circuit, for amplifying the electric current sampled and obtain；
The gating circuit, one end connect the output end of the discharge circuit, and the other end connects the negative half period protector and just
The input of half cycle protector, for the output of the discharge circuit is sent to the negative half period protector or the protection of positive half cycle
Device；
The negative half period protector, for processing to the negative half period of the electric current after amplification, so as to realize bearing to phase current
The overcurrent protection of half cycle；And
The positive half cycle protector, for processing to the positive half cycle of the electric current after amplification, so as to just realize to phase current
The overcurrent protection of half cycle.
2. current protecting circuit according to claim 1, it is characterised in that also include：
Biasing circuit, is connected to the end in the same direction of the discharge circuit, for lifting the output of the discharge circuit.
3. current protecting circuit according to claim 1 and 2, it is characterised in that
The gating circuit includes positive half cycle clamping unit, is connected between the output end of discharge circuit and positive half cycle protector,
For the output of discharge circuit is sent to positive half cycle protector, to realize the protection to positive half cycle current.
4. current protecting circuit according to claim 3, it is characterised in that
The positive half cycle clamping unit is clamp diode, and the output end of its negative electrode connection discharge circuit, anode are connected to
Positive half cycle protector.
5. current protecting circuit according to claim 1 and 2, it is characterised in that
The gating circuit also include negative half period clamping unit, be connected to discharge circuit output end and negative half period protector it
Between, for the output of discharge circuit is sent to negative half period protector, to realize the protection to negative half-cycle current.
6. current protecting circuit according to claim 5, it is characterised in that
The negative half period clamping unit is diode, and the anode of the diode connects the output end of the discharge circuit, negative electrode
It is connected to negative half period protector.
7. the current protecting circuit according to any one of claim 1-6, it is characterised in that
The negative half period protector includes first comparator, and the backward end of the first comparator connects the another of the gating circuit
One end, holds input setting value in the same direction.
8. current protecting circuit according to claim 7, it is characterised in that
The negative half period protector also includes first resistor and second resistance；
The first resistor is connected between the backward end of the other end of the gating circuit and the first comparator, and described
Two resistance are connected between the backward end and ground of the first comparator.
9. the current protecting circuit according to any one of claim 1-6, it is characterised in that
The positive half cycle protector includes the second comparator, and the backward end of second comparator connects the another of the gating circuit
One end, holds input setting value in the same direction.
10. current protecting circuit according to claim 9, it is characterised in that
The positive half cycle protector also includes the 5th resistance and the 6th resistance, and the 5th resistance is connected to supply voltage (Vcc)
And the backward end of second comparator between, the 6th resistance is connected to the backward end and ground of second comparator
Between, for the backward end to second comparator, initial voltage is set.
11. current protecting circuits according to claim 2, it is characterised in that
The biasing circuit includes the first biasing resistor and the second biasing resistor；
First biasing circuit be connected to and the end in the same direction of discharge circuit between；Second biasing resistor is connected to amplifier
Between the end in the same direction of circuit and supply voltage (Vcc).
12. current protecting circuits according to claim 1 and 2, it is characterised in that
The current protecting circuit is used for the protection of three phase mains electric current；
The sampling resistor includes the first to the 3rd sampling resistor, is respectively used to sample three phase mains electric current；
The discharge circuit includes the first to the 3rd discharge circuit, is respectively used to what the sampling of the first to the 3rd sampling resistor was obtained
Electric current is amplified；And
The gating circuit includes the first to the 3rd gating branch road, be connected to the output end of the first to the 3rd discharge circuit with
Between negative half period protector and positive half cycle protector.
13. current protecting circuits according to claim 12, it is characterised in that
The first to the 3rd negative half period clamping unit and first to the 3rd are respectively arranged with described first to the 3rd gating branch road
Positive half cycle clamping unit；Wherein,
First to the 3rd negative half period clamping unit is connected to the output end of the first to the 3rd discharge circuit and negative half period is protected
Between device, for filtering out the maximum of three discharge circuit outputs；
First to the 3rd positive half cycle clamping unit be connected to the first to the 3rd discharge circuit output end and positive half cycle protector it
Between, for filtering out the minimum of a value of three discharge circuit outputs.
14. current protecting circuits according to claim 13, it is characterised in that
Described first to the 3rd negative half period clamping unit is the first to the 3rd diode, and the anode of the first to the 3rd diode connects
The output end of discharge circuit, negative electrode connection negative half period protector；
Described first to the 3rd positive half cycle clamping unit is the first to the 3rd clamp diode, the first to the 3rd clamp diode
Negative electrode connects the output end of discharge circuit, anode connection negative half period protector.
15. a kind of current protection systems, it is characterised in that including SPM；Also include being appointed according to claim 1-14
Current protecting circuit described in one；And control unit；Wherein
The phase current of the SPM output is processed by the current protecting circuit；
Negative half period protector and/or positive half cycle protection when the phase current reaches protection value, in the current protecting circuit
Device exports overcurrent protection signal to the SPM, and the SPM output alarm signal gives the control
Thus unit, described control unit stop output drive signal.
16. current protection systems according to claim 15, it is characterised in that
Described control unit is sampled to the output signal of the discharge circuit simultaneously, and is carried out with the setting value of storage inside
Relatively, to realize the duplicate protection of electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611143625.9A CN106532627A (en) | 2016-12-13 | 2016-12-13 | Current protection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611143625.9A CN106532627A (en) | 2016-12-13 | 2016-12-13 | Current protection circuit and system |
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| Publication Number | Publication Date |
|---|---|
| CN106532627A true CN106532627A (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611143625.9A Pending CN106532627A (en) | 2016-12-13 | 2016-12-13 | Current protection circuit and system |
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| CN (1) | CN106532627A (en) |
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| CN108054728A (en) * | 2017-12-08 | 2018-05-18 | 珠海格力电器股份有限公司 | Current protection device, compressor circuit and current protection method thereof |
| CN109193569A (en) * | 2018-09-28 | 2019-01-11 | 珠海格力电器股份有限公司 | IPM protection device, motor and IPM protection method thereof |
| CN110412341A (en) * | 2019-08-09 | 2019-11-05 | 珠海格力电器股份有限公司 | IPM over-current detection circuit |
| CN110460018A (en) * | 2019-08-29 | 2019-11-15 | 合肥阳光电动力科技有限公司 | A kind of electric machine controller and its alternate protection circuit |
| CN110707664A (en) * | 2019-10-30 | 2020-01-17 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
| CN114963346A (en) * | 2022-05-06 | 2022-08-30 | 宁波奥克斯电气股份有限公司 | Totem-pole circuit, air conditioner external unit and air conditioner |
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| CN110460018A (en) * | 2019-08-29 | 2019-11-15 | 合肥阳光电动力科技有限公司 | A kind of electric machine controller and its alternate protection circuit |
| CN110707664A (en) * | 2019-10-30 | 2020-01-17 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
| CN110707664B (en) * | 2019-10-30 | 2020-10-02 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
| CN114963346A (en) * | 2022-05-06 | 2022-08-30 | 宁波奥克斯电气股份有限公司 | Totem-pole circuit, air conditioner external unit and air conditioner |
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Application publication date: 20170322 |