CN107919654B - A kind of the protection circuit and MPPT chip of excess-current excess-temperature - Google Patents
A kind of the protection circuit and MPPT chip of excess-current excess-temperature Download PDFInfo
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- CN107919654B CN107919654B CN201711340457.7A CN201711340457A CN107919654B CN 107919654 B CN107919654 B CN 107919654B CN 201711340457 A CN201711340457 A CN 201711340457A CN 107919654 B CN107919654 B CN 107919654B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
Abstract
The present invention provides a kind of protection circuit of excess-current excess-temperature and MPPT chips; including sample rate current source, multi-stage current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit; the output end in sample rate current source is connect with the input terminal of multi-stage current comparison circuit; the output end in temperature current source is connect with the input terminal of multistage temperature comparison circuit; the output end of multi-stage current comparison circuit and the first input end of control circuit connect, and the output end of multistage temperature comparison circuit and the second input terminal of control circuit connect.The application realizes the working condition by temperature and conducting electric current co- controlling MPPT chip, i.e. when temperature is higher, conducting electric current is also higher, the two can co- controlling MPPT chip stop working, the phenomenon that MPPT chip generates serious fever is avoided, to improve the safety and reliability of MPPT chip.
Description
Technical field
The present invention relates to circuit protection technical fields, more particularly to the protection circuit and MPPT core of a kind of excess-current excess-temperature
Piece.
Background technique
With the development of heliotechnics, solar battery using more and more extensive.Solar battery is to pass through photovoltaic
Plate converts light energy into electric energy, in order to improve transfer efficiency, it will usually connect a chip-scale in the output end of photovoltaic panel
MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) system, to realize the tracking of maximum power
And conversion.In the prior art, it is contemplated that MPPT chip will receive ambient temperature, the photovoltaic panel output shadows such as electric current and hot spot effect
Ring, cause it to generate different degrees of fever phenomenon, or even can be burned out, MPPT chip would generally be added thermal-shutdown circuit and
Current foldback circuit, when the temperature of chip reaches certain high temperature, thermal-shutdown circuit can control chip and stop working, or work as
When the conducting electric current of chip reaches certain value, current foldback circuit can control chip and stop working, thus to its temperature and maximum
Conducting electric current is monitored.But thermal-shutdown circuit and current foldback circuit can only realize respective monodrome control, if warm
Spend that higher, conducting electric current is also higher and is not enough to control chip when stopping working, the fever phenomenon of MPPT chip is also that comparison is tight
Weight, to reduce the safety and reliability of MPPT chip.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of protection circuit of excess-current excess-temperature and MPPT chips, when temperature is higher, conducting
When electric current is also higher, the two can co- controlling MPPT chip stop working, avoid MPPT chip and generate and seriously generate heat
Phenomenon, to improve the safety and reliability of MPPT chip.
In order to solve the above technical problems, it is applied to MPPT chip the present invention provides a kind of protection circuit of excess-current excess-temperature,
It is sample rate current source including the conducting electric current for sampling the MPPT chip, multistage for being arranged according to the conducting electric current
Multi-stage current comparison circuit, the input current of current threshold the temperature current source directly proportional to the temperature of the MPPT chip are used
In multistage temperature comparison circuit and control circuit according to the multistage temperature threshold of the temperature setting, in which:
The output end in the sample rate current source is connect with the input terminal of the multi-stage current comparison circuit, the temperature current
The output end in source is connect with the input terminal of the multistage temperature comparison circuit, the output end of the multi-stage current comparison circuit and institute
State the first input end connection of control circuit, the second of the output end of the multistage temperature comparison circuit and the control circuit is defeated
Enter end connection, the control circuit is used for the output valve of the multi-stage current comparison circuit and the multistage temperature comparison circuit
Output valve combined by default trade-off relationship, in order to by described in the temperature and the conducting electric current co- controlling
The working condition of MPPT chip.
Preferably, the output end of the multi-stage current comparison circuit includes first voltage output end, second voltage output end
And tertiary voltage output end, the first input end of the control circuit include first voltage input terminal, second voltage input terminal and
Tertiary voltage input terminal, the first voltage output end of the multi-stage current comparison circuit and the first voltage of the control circuit are defeated
Enter end connection, the second voltage output end of the multi-stage current comparison circuit and the second voltage input terminal of the control circuit connect
It connects, the tertiary voltage output end of the multi-stage current comparison circuit is connect with the tertiary voltage input terminal of the control circuit；
The multi-stage current comparison circuit includes first resistor, second resistance, 3rd resistor, first comparator, the second ratio
Compared with device and third comparator, in which:
The first end of the first resistor is connect with the input terminal of the first comparator, and common end is as described multistage
The input terminal of current comparison circuit, first voltage of the output end of the first comparator as the multi-stage current comparison circuit
Output end, the second end of the first resistor input terminal with the first end of the second resistance and second comparator respectively
Connection, second voltage output end of the output end of second comparator as the multi-stage current comparison circuit, described second
The second end of resistance is connect with the input terminal of the first end of the 3rd resistor and the third comparator respectively, the third ratio
Tertiary voltage output end compared with the output end of device as the multi-stage current comparison circuit, the second termination of the 3rd resistor
The reference edge on ground, the first comparator, second comparator and the third comparator is defeated with the first DC power supply
Outlet connection.
Preferably, the multi-stage current comparison circuit further includes that the first shockproof circuit, the second shockproof circuit and third are shockproof
Circuit, in which:
The input terminal of the first shockproof circuit is connect with the output end of the first comparator, the first shockproof circuit
First voltage output end of the output end as the multi-stage current comparison circuit, the input terminal of the second shockproof circuit and institute
State the output end connection of the second comparator, the output end of the second shockproof circuit as the multi-stage current comparison circuit the
Two voltage output ends, the input terminal of the shockproof circuit of third are connect with the output end of the third comparator, the anti-seismoelectric of third
Tertiary voltage output end of the output end on road as the multi-stage current comparison circuit.
Preferably, the described first shockproof circuit, the second shockproof circuit and the shockproof circuit of the third are Schmitt
Trigger or hysteresis comparator.
Preferably, the output end of the multistage temperature comparison circuit includes the 4th voltage output end, the 5th voltage output end
And the 6th voltage output end, the second input terminal of the control circuit include the 4th voltage input end, the 5th voltage input end and
6th voltage input end, the 4th voltage output end of the multistage temperature comparison circuit and the 4th voltage of the control circuit are defeated
Enter end connection, the 5th voltage output end of the multistage temperature comparison circuit and the 5th voltage input end of the control circuit connect
It connects, the 6th voltage output end of the multistage temperature comparison circuit is connect with the 6th voltage input end of the control circuit；
The multistage temperature comparison circuit includes the 4th resistance, the 5th resistance, the 6th resistance, the 4th comparator, the 5th ratio
Compared with device and the 6th comparator, in which:
The first end of 4th resistance is connect with the input terminal of the 4th comparator, and common end is as described multistage
The input terminal of temperature comparison circuit, fourth voltage of the output end of the 4th comparator as the multistage temperature comparison circuit
Output end, the second end of the 4th resistance input terminal with the first end of the 5th resistance and the 5th comparator respectively
Connection, fiveth voltage output end of the output end of the 5th comparator as the multistage temperature comparison circuit, the described 5th
The second end of resistance is connect with the input terminal of the first end of the 6th resistance and the 6th comparator respectively, the 6th ratio
The 6th voltage output end compared with the output end of device as the multistage temperature comparison circuit, the second termination of the 6th resistance
The reference edge on ground, the 4th comparator, the 5th comparator and the 6th comparator is defeated with the second DC power supply
Outlet connection.
Preferably, the multistage temperature comparison circuit further includes that the 4th shockproof circuit, the 5th shockproof circuit and the 6th are shockproof
Circuit, in which:
The input terminal of the 4th shockproof circuit is connect with the output end of the 4th comparator, the 4th shockproof circuit
Fourth voltage output end of the output end as the multistage temperature comparison circuit, the input terminal of the 5th shockproof circuit and institute
State the output end connection of the 5th comparator, the output end of the 5th shockproof circuit as the multistage temperature comparison circuit the
Five voltage output ends, the input terminal of the 6th shockproof circuit are connect with the output end of the 6th comparator, the 6th anti-seismoelectric
Sixth voltage output end of the output end on road as the multistage temperature comparison circuit.
Preferably, the 4th shockproof circuit, the 5th shockproof circuit and the 6th shockproof circuit are Schmitt
Trigger or hysteresis comparator.
Preferably, the control circuit includes the first NOT gate, the second NOT gate, third NOT gate, the one or three input and door, second
Three inputs and door, the three or three input and door, the one or two input and door, the two or two input and door, the three or two input and door, four inputs
Nor gate, in which:
The input terminal of first NOT gate is inputted with the one or three input with the first input end of door and the two or three respectively
It is connect with the first input end of door, fourth voltage input end of the common end as the control circuit, first NOT gate
Output end is connect with the three or three input with the first input end of door, the input terminal of second NOT gate and the described 1st defeated
Enter and is connect with the second input terminal of door, fiveth voltage input end of the common end as the control circuit, second NOT gate
Output end the second input terminal with the two or three input and the second input terminal of door and the three or three input and door respectively
Connection, the input terminal of the third NOT gate is connect with the first input end of the four inputs nor gate, described in the conduct of common end
6th voltage input end of control circuit, the output end of the third NOT gate are defeated with the third of door with the one or three input respectively
Enter end, the two or three input is inputted with the third input terminal of door and the three or three and is connect with the third input terminal of door, the described 1st is defeated
Enter and connect with the output end of door with the one or two input with the first input end of door, the described 1st input with it is the second of door defeated
Enter first voltage input terminal of the end as the control circuit, the one or two input inputted with the output end of door and described four or
Second input terminal of NOT gate connects, the two or three input and the output end of door and the first input of the two or two input and door
End connection, second voltage input terminal of the two or two input with the second input terminal of door as the control circuit, described the
Two or two inputs are connect with the output end of door with the third input terminal of the four inputs nor gate, and the three or three input is defeated with door
Outlet is connect with the three or two input with the first input end of door, and the second input terminal of the three or two input and door is as institute
The tertiary voltage input terminal of control circuit is stated, the three or two input inputs the 4th of nor gate with the output end of door and described four
Input terminal connection, output end of the output end of the four inputs nor gate as the control circuit.
In order to solve the above technical problems, the present invention also provides a kind of MPPT chip, including any of the above-described kind of excess-current excess-temperature
Protection circuit.
The present invention provides a kind of protection circuit of excess-current excess-temperature, it is applied to MPPT chip, including sample rate current source, multistage
Current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit, the output end in sample rate current source and multistage electricity
The input terminal connection of comparison circuit is flowed, the output end in temperature current source is connect with the input terminal of multistage temperature comparison circuit, multistage
The output end of current comparison circuit and the first input end of control circuit connect, the output end of multistage temperature comparison circuit and control
Second input terminal of circuit connects.
Compared with the thermal-shutdown circuit and current foldback circuit of monodrome in the prior art control, the protection electricity of the application
Road is leading for MPPT chip by the conducting electric current of sample rate current source sampling MPPT chip namely the input current in sample rate current source
Galvanization；Pass through the temperature of temperature current source sampling MPPT chip namely the input current in temperature current source and MPPT chip
Temperature is directly proportional.The output electric current in sample rate current source is input to multi-stage current comparison circuit, and multi-stage current comparison circuit is for setting
Set the current threshold of different phase；The output electric current in temperature current source is input to multistage temperature comparison circuit, and multistage temperature compares
Circuit is used to be arranged the temperature threshold of different phase.The trade-off relationship set eventually by control circuit is by the output valve of the two
In conjunction with to realize the working condition for passing through temperature and conducting electric current co- controlling MPPT chip.
As it can be seen that the protection circuit of the application is when temperature is higher, conducting electric current is also higher, the two can co- controlling
MPPT chip stops working, and the phenomenon that MPPT chip generates serious fever is avoided, to improve the safety of MPPT chip
And reliability.
The present invention also provides a kind of MPPT chips, with above-mentioned protection circuit beneficial effect having the same.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the protection circuit of excess-current excess-temperature provided by the invention；
Fig. 2 is the concrete structure schematic diagram of multi-stage current comparison circuit shown in FIG. 1；
Fig. 3 is the concrete structure schematic diagram of multistage temperature comparison circuit shown in FIG. 1；
Fig. 4 is the concrete structure schematic diagram of control circuit shown in FIG. 1.
Specific embodiment
Core of the invention is to provide the protection circuit and MPPT chip of a kind of excess-current excess-temperature, when temperature is higher, conducting
When electric current is also higher, the two can co- controlling MPPT chip stop working, avoid MPPT chip and generate and seriously generate heat
Phenomenon, to improve the safety and reliability of MPPT chip.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural schematic diagram of the protection circuit of excess-current excess-temperature provided by the invention.
The protection circuit is applied to MPPT chip, sample rate current source 1 including the conducting electric current for sampling MPPT chip,
For the multi-stage current comparison circuit 2 of multistage current threshold, the temperature of input current and MPPT chip to be arranged according to conducting electric current
Spend directly proportional temperature current source 3, for according to the multistage temperature comparison circuit 4 of the multistage temperature threshold of temperature setting and control
Circuit 5, in which:
The output end in sample rate current source 1 is connect with the input terminal of multi-stage current comparison circuit 2, the output in temperature current source 3
End is connect with the input terminal of multistage temperature comparison circuit 4, the output end of multi-stage current comparison circuit 2 and the first of control circuit 5
Input terminal connection, the output end of multistage temperature comparison circuit 4 are connect with the second input terminal of control circuit 5, and control circuit 5 is used for
The output valve of multi-stage current comparison circuit 2 and the output valve of multistage temperature comparison circuit 4 are combined by default trade-off relationship,
In order to pass through the working condition of temperature and conducting electric current co- controlling MPPT chip.
It should be noted that default in the application sets in advance, it is only necessary to which setting is primary, unless according to reality
Situation needs to modify, and does not otherwise need to reset.
Specifically, overtemperature and overcurrent provided by the present application protection circuit include sample rate current source 1, multi-stage current comparison circuit 2,
Temperature current source 3, multistage temperature comparison circuit 4 and control circuit 5.The premise of overtemperature and overcurrent protection is the conducting to MPPT chip
Electric current and temperature are sampled respectively, and the application samples the conducting electric current of MPPT chip using sample rate current source 1, make it
Input current is the conducting electric current of MPPT chip, and the size of current in sample rate current source 1 is only by the conducting electric current of MPPT chip
Influence.The application samples the temperature of MPPT chip using temperature current source 3, and the principle in temperature current source 3 is that its is defeated
Enter that electric current is directly proportional to the temperature of MPPT chip, the temperature for correspondingly reflecting MPPT chip by size of current therein is high
It is low.
The output electric current in sample rate current source 1 is input to multi-stage current comparison circuit 2, and output electric current can be with MPPT chip
The variation of conducting electric current and change, multi-stage current comparison circuit 2 is by the output electric current sublevel namely multistage electricity in sample rate current source 1
The output of stream comparison circuit 2 can change with the output electric current of 1 different phase of sample rate current source.For example, multi-stage current ratio
The output electric current in sample rate current source 1 is divided into tri- rank of I1, I2 and I3 and I1 < I2 < I3 compared with circuit 2, it is defeated when sample rate current source 1
When electric current is less than I1 out, the output valve of multi-stage current comparison circuit 2 is identical；When the output electric current in sample rate current source 1 is more than or equal to
I1 and be less than I2 when, the output valve of multi-stage current comparison circuit 2 is identical；When the output electric current in sample rate current source 1 is more than or equal to I2
And when being less than I3, the output valve of multi-stage current comparison circuit 2 is identical；When the output electric current in sample rate current source 1 is more than or equal to I3,
The output valve of multi-stage current comparison circuit 2 is identical.That is, in the output current scope of 1 different phase of sample rate current source,
The output valve of multi-stage current comparison circuit 2 is not identical, and multistage current threshold is arranged to realize.
Similarly, the output electric current in temperature current source 3 is input to multistage temperature comparison circuit 4, and output electric current can be with
The variation of the temperature of MPPT chip and change, multistage temperature comparison circuit 4 by the output electric current sublevel in temperature current source 3, namely
Multistage temperature threshold is arranged to realize in the temperature sublevel that temperature current source 3 is sampled.
The output valve of multi-stage current comparison circuit 2 and multistage temperature comparison circuit 4 is input to control circuit 5, control electricity
Road 5 combines the output valve of the two according to the trade-off relationship set inside it, and trade-off relationship here is by MPPT chip
Temperature and conducting electric current combine, the working condition of co- controlling MPPT chip, it is relatively high to be primarily directed to temperature, leads
Galvanization also relatively high situation, both multi-stage current comparison circuit 2 and multistage temperature comparison circuit 4 combine at this time, can control
MPPT chip processed stops working, be equivalent to temperature and conducting electric current inhibit each other, collective effect, avoid MPPT chip generate it is tight
The phenomenon for retransmitting heat, to improve the safety and reliability of MPPT chip.
The present invention provides a kind of protection circuit of excess-current excess-temperature, it is applied to MPPT chip, including sample rate current source, multistage
Current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit, the output end in sample rate current source and multistage electricity
The input terminal connection of comparison circuit is flowed, the output end in temperature current source is connect with the input terminal of multistage temperature comparison circuit, multistage
The output end of current comparison circuit and the first input end of control circuit connect, the output end of multistage temperature comparison circuit and control
Second input terminal of circuit connects.
Compared with the thermal-shutdown circuit and current foldback circuit of monodrome in the prior art control, the protection electricity of the application
Road is leading for MPPT chip by the conducting electric current of sample rate current source sampling MPPT chip namely the input current in sample rate current source
Galvanization；Pass through the temperature of temperature current source sampling MPPT chip namely the input current in temperature current source and MPPT chip
Temperature is directly proportional.The output electric current in sample rate current source is input to multi-stage current comparison circuit, and multi-stage current comparison circuit is for setting
Set the current threshold of different phase；The output electric current in temperature current source is input to multistage temperature comparison circuit, and multistage temperature compares
Circuit is used to be arranged the temperature threshold of different phase.The trade-off relationship set eventually by control circuit is by the output valve of the two
In conjunction with to realize the working condition for passing through temperature and conducting electric current co- controlling MPPT chip.
As it can be seen that the protection circuit of the application is when temperature is higher, conducting electric current is also higher, the two can co- controlling
MPPT chip stops working, and the phenomenon that MPPT chip generates serious fever is avoided, to improve the safety of MPPT chip
And reliability.
On the basis of the above embodiments:
Referring to figure 2., Fig. 2 is the concrete structure schematic diagram of multi-stage current comparison circuit shown in FIG. 1.
As a kind of preferred embodiment, the output end of multi-stage current comparison circuit 2 includes first voltage output end, second
Voltage output end and tertiary voltage output end, the first input end of control circuit 5 include that first voltage input terminal, second voltage are defeated
Enter end and tertiary voltage input terminal, the first voltage output end of multi-stage current comparison circuit 2 and the first voltage of control circuit 5 are defeated
Enter end connection, the second voltage output end of multi-stage current comparison circuit 2 is connect with the second voltage input terminal of control circuit 5, more
The tertiary voltage output end of rank current comparison circuit 2 is connect with the tertiary voltage input terminal of control circuit 5；
Multi-stage current comparison circuit 2 includes first resistor R1, second resistance R2,3rd resistor R3, first comparator A1, the
Two comparator A2 and third comparator A3, in which:
The first end of first resistor R1 is connect with the input terminal of first comparator A1, and common end is compared as multi-stage current
The input terminal of circuit 2, first voltage output end of the output end of first comparator A1 as multi-stage current comparison circuit 2, first
The second end of resistance R1 is connect with the input terminal of the first end of second resistance R2 and the second comparator A2 respectively, the second comparator A2
Second voltage output end of the output end as multi-stage current comparison circuit 2, the second end of second resistance R2 respectively with third electricity
It hinders the first end of R3 and the input terminal connection of third comparator A3, the output end of third comparator A3 is more electric as multi-stage current
The tertiary voltage output end on road 2, the second end ground connection of 3rd resistor R3, first comparator A1, the second comparator A2 and third ratio
Reference edge compared with device A3 is connect with the output end of the first DC power supply.
Specifically, as shown in Figure 2, the output voltage of the first DC power supply is VREF1, is benchmark voltage.Sample rate current
The output electric current in source 1 generates pressure drop, first resistor R1 by first resistor R1, second resistance R2 and tri- resistance of 3rd resistor R3
The voltage V1 of first end, second resistance R2 the voltage V3 of first end of voltage V2 and 3rd resistor R3 of first end lead to respectively
Respectively connected comparator is crossed compared with the same reference voltage VREF1.Due to V1 > V2 > V3, so the output of comparator
Becoming 1 sequence from 0 is first comparator A1, the second comparator A2 and third comparator A3.If working as the output in sample rate current source 1
When electric current reaches Isense1, the output valve VOUT1 of the output end of first comparator A1 becomes 1 from 0, defeated when sample rate current source 1
When electric current reaches Isense2 out, the output valve VOUT2 of the output end of the second comparator A2 becomes 1 from 0, when sample rate current source 1
When output electric current reaches Isense3, the output valve VOUT3 of the output end of third comparator A3 becomes 1 from 0, then Isense1 <
Isense2 < Isense3, to be provided with three rank current thresholds.The then output electric current Isense Yu multistage electricity in sample rate current source 1
Flow the following table of relationship of the output valve of comparison circuit 2:
Table 1
| Isense | VOUT1 | VOUT2 | VOUT3 |
| < Isense1 | 0 | 0 | 0 |
| Isense1≤Isense<Isense2 | 1 | 0 | 0 |
| Isense2≤Isense<Isense3 | 1 | 1 | 0 |
| ≥Isense3 | 1 | 1 | 1 |
As a kind of preferred embodiment, multi-stage current comparison circuit 2 further includes the first shockproof circuit, the second shockproof circuit
And the shockproof circuit of third, in which:
The input terminal of first shockproof circuit is connect with the output end of first comparator A1, and the output end of the first shockproof circuit is made
For the first voltage output end of multi-stage current comparison circuit 2, the output of the input terminal of the second shockproof circuit and the second comparator A2
End connection, second voltage output end of the output end of the second shockproof circuit as multi-stage current comparison circuit 2, the shockproof circuit of third
Input terminal connect with the output end of third comparator A3, the output end of the shockproof circuit of third is as multi-stage current comparison circuit 2
Tertiary voltage output end.
Specifically, it is contemplated that when the input signal of comparator has lesser interference near threshold value, then output voltage meeting
Corresponding concussion is generated, output end of the application in first comparator A1, the second comparator A2 and third comparator A3 is all connected with
One shockproof circuit, when preventing output electric current in sample rate current source 1 close to current threshold, three comparators shake, and mention
The high stability and reliability of system.
As a kind of preferred embodiment, the first shockproof circuit, the second shockproof circuit and the shockproof circuit of third are that this is close
Special trigger or hysteresis comparator.
Specifically, the application can select Schmitt trigger or hysteresis comparator as the first anti-seismoelectric here
Road, the second shockproof circuit and the shockproof circuit of third.Schmitt trigger is for preventing input voltage from minor change occur and cause
Output voltage change, have strong anti-interference ability.Hysteresis comparator, which is one, has sluggish winding transmission characteristic
Comparator introduces positive feedback network on the basis of anti-phase input simple gate voltage limit comparator, equally has stronger anti-interference
Ability.
Certainly, the first shockproof circuit, the second shockproof circuit and the shockproof circuit of third in the application can also select other
Shockproof device, the application are not particularly limited herein.
Referring to figure 3., Fig. 3 is the concrete structure schematic diagram of multistage temperature comparison circuit shown in FIG. 1.
As a kind of preferred embodiment, the output end of multistage temperature comparison circuit 4 includes the 4th voltage output end, the 5th
Second input terminal of voltage output end and the 6th voltage output end, control circuit 5 is defeated including the 4th voltage input end, the 5th voltage
Enter end and the 6th voltage input end, the 4th voltage output end of multistage temperature comparison circuit 4 and the 4th voltage of control circuit 5 are defeated
Enter end connection, the 5th voltage output end of multistage temperature comparison circuit 4 is connect with the 5th voltage input end of control circuit 5, more
6th voltage output end of rank temperature comparison circuit 4 is connect with the 6th voltage input end of control circuit 5；
Multistage temperature comparison circuit 4 includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 4th comparator A4, the
Five comparator A5 and the 6th comparator A6, in which:
The first end of 4th resistance R4 is connect with the input terminal of the 4th comparator A4, and common end is compared as multistage temperature
The input terminal of circuit 4, fourth voltage output end of the output end of the 4th comparator A4 as multistage temperature comparison circuit 4, the 4th
The second end of resistance R4 is connect with the input terminal of the first end of the 5th resistance R5 and the 5th comparator A5 respectively, the 5th comparator A5
Fiveth voltage output end of the output end as multistage temperature comparison circuit 4, the second end of the 5th resistance R5 respectively with the 6th electricity
It hinders the first end of R6 and the input terminal connection of the 6th comparator A6, the output end of the 6th comparator A6 is more electric as multistage temperature
6th voltage output end on road 4, the second end ground connection of the 6th resistance R6, the 4th comparator A4, the 5th comparator A5 and the 6th ratio
Reference edge compared with device A6 is connect with the output end of the second DC power supply.
It similarly, is benchmark voltage from the figure 3, it may be seen that the output voltage of the second DC power supply is VREF2.Temperature current
The output electric current in source 3 generates pressure drop, the 4th resistance R4 by tri- the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 resistance
The voltage V4 of first end, the 5th resistance R5 the voltage V6 of first end of voltage V5 and the 6th resistance R6 of first end lead to respectively
Respectively connected comparator is crossed compared with the same reference voltage VREF2.Due to V4 > V5 > V6, so the output of comparator
Becoming 1 sequence from 0 is the 4th comparator A4, the 5th comparator A5 and the 6th comparator A6.If being sampled when temperature current source 3
When temperature reaches T4, the output valve VOUT4 of the output end of the 4th comparator A4 becomes 1 from 0, when the temperature that temperature current source 3 samples
When degree reaches T5, the output valve VOUT5 of the output end of the 5th comparator A5 becomes 1 from 0, when the temperature that temperature current source 3 samples
When reaching T6, the output valve VOUT6 of the output end of the 6th comparator A6 becomes 1 from 0, then T4 < T5 < T6, to be provided with three
Rank temperature threshold.The following table of relationship of the output valve of temperature T and multistage temperature comparison circuit 4 that then temperature current source 3 samples:
Table 2
| T | VOUT4 | VOUT5 | VOUT6 |
| < T4 | 0 | 0 | 0 |
| T4≤T<T5 | 1 | 0 | 0 |
| T5≤T<T6 | 1 | 1 | 0 |
| ≥T6 | 1 | 1 | 1 |
As a kind of preferred embodiment, multistage temperature comparison circuit 4 further includes the 4th shockproof circuit, the 5th shockproof circuit
And the 6th shockproof circuit, in which:
The input terminal of 4th shockproof circuit is connect with the output end of the 4th comparator A4, and the output end of the 4th shockproof circuit is made
For the 4th voltage output end of multistage temperature comparison circuit 4, the output of the input terminal and the 5th comparator A5 of the 5th shockproof circuit
End connection, fiveth voltage output end of the output end of the 5th shockproof circuit as multistage temperature comparison circuit 4, the 6th shockproof circuit
Input terminal connect with the output end of the 6th comparator A6, the output end of the 6th shockproof circuit is as multistage temperature comparison circuit 4
The 6th voltage output end.
Similarly, it is contemplated that when the input signal of comparator has lesser interference near threshold value, then output voltage meeting
Corresponding concussion is generated, output end of the application in the 4th comparator A4, the 5th comparator A5 and the 6th comparator A6 is all connected with
One shockproof circuit, when preventing the temperature sampled in temperature current source 3 close to temperature threshold, three comparators shake, into
One step improves the stability and reliability of system.
As a kind of preferred embodiment, the 4th shockproof circuit, the 5th shockproof circuit and the 6th shockproof circuit are that this is close
Special trigger or hysteresis comparator.
Similarly, the application can select Schmitt trigger or hysteresis comparator as the 4th anti-seismoelectric here
Road, the 5th shockproof circuit and the 6th shockproof circuit.The 4th shockproof circuit, the 5th shockproof circuit and the 6th anti-seismoelectric in the application
Road can also select other shockproof devices, and the application is not particularly limited herein.
Referring to figure 4., Fig. 4 is the concrete structure schematic diagram of control circuit shown in FIG. 1.
As a kind of preferred embodiment, control circuit 5 includes the first NOT gate 11, the second NOT gate 12, third NOT gate 13, the
One or three inputs are inputted with the input of door the 23, the 1st with door the 31, the 2nd 2 with the input of door the 21, the 2nd 3 with the input of door the 22, the 3rd 3
Nor gate 41 is inputted with door 33, four with the input of door the 32, the 3rd 2, in which:
The input terminal of first NOT gate 11 inputs respectively with the one or three input with the first input end of door 21 and the two or three and door
22 first input end connection, fourth voltage input end of the common end as control circuit 5, the output end of the first NOT gate 11 and
Three or three input is connect with the first input end of door 23, the input terminal of the second NOT gate 12 with the one or three input with it is the second of door 21 defeated
Enter end connection, fiveth voltage input end of the common end as control circuit 5, the output end of the second NOT gate 12 is respectively with the two or three
Input is connect with the second input terminal of door 22 and the three or three input with the second input terminal of door 23, the input terminal of third NOT gate 13 and
The first input end connection of four input nor gates 41, sixth voltage input end of the common end as control circuit 5, third NOT gate
13 output end respectively with the one or three input and the third input terminal of door 21, the third input terminal of the two or three input and door 22 and the
Three or three inputs connects with the third input terminal of door 23, the one or three input inputted with the output end of door 21 and the one or two and door 31 the
First voltage input terminal of second input terminal of the connection of one input terminal, the one or two input and door 31 as control circuit 5, the one or two
Input with the output end of door 31 with four input nor gates 41 the second input terminal connect, the two or three input and door 22 output end and
Two or two input is connect with the first input end of door 32, and the second input terminal of the two or two input and door 32 is as control circuit 5
Second voltage input terminal, the two or two input are connect with the output end of door 32 with the third input terminal of four input nor gates 41, third
Three inputs are connect with the output end of door 23 with the three or two input with the first input end of door 33, the three or two input and the second of door 33
Tertiary voltage input terminal of the input terminal as control circuit 5, the three or two input and the output end of door 33 and four input nor gates 41
The connection of the 4th input terminal, output end of the output end as control circuit 5 of four input nor gates 41.
It should be noted that the identical port of the voltage value of Fig. 4 indicates to link together.Specifically, the control of the application
The trade-off relationship of circuit 5 designs as shown in figure 4, being illustrated with reference to Tables 1 and 2 to function.Control circuit 5, which is realized, works as MPPT core
When the temperature T < T4 of piece, overcurrent turn-off function threshold value is Isense3, i.e. conducting electric current once reaches Isense3, controls MPPT chip
It does not work；As T4≤T < T5, overcurrent turn-off function threshold value is Isense2, i.e. conducting electric current once reaches Isense2, controls MPPT
Chip does not work；As T5≤T < T6, overcurrent turn-off function threshold value is Isense1, i.e. conducting electric current once reaches Isense1, is controlled
MPPT chip does not work；As temperature T >=T6, for maximum overheat protector point, control MPPT chip does not work.That is, warm
Degree is located at the higher stage, and overcurrent turn-off function threshold value is lower, and the working condition of the two co- controlling MPPT chip prevents MPPT chip
The phenomenon that serious fever, generates, and improves the safety and reliability of MPPT chip.Moreover, temperature reaches maximum overheat protector
Point, the size of tube current, does not directly control MPPT chip and does not work, and extends the service life of MPPT chip.
The present invention also provides a kind of MPPT chip, the protection circuit including any of the above-described kind of excess-current excess-temperature.
The introduction of MPPT chip provided by the invention please refers to above-mentioned protection circuit embodiments, and the present invention is no longer superfluous herein
It states.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (6)
1. a kind of protection circuit of excess-current excess-temperature is applied to MPPT chip, which is characterized in that including for sampling the MPPT core
The sample rate current source of the conducting electric current of piece is compared for the multi-stage current of multistage current threshold to be arranged according to the conducting electric current
Circuit, input current the temperature current source directly proportional to the temperature of the MPPT chip, for according to the temperature setting it is multistage
Temperature threshold multistage temperature comparison circuit and control circuit, in which:
The output end in the sample rate current source is connect with the input terminal of the multi-stage current comparison circuit, the temperature current source
Output end is connect with the input terminal of the multistage temperature comparison circuit, the output end of the multi-stage current comparison circuit and the control
The first input end of circuit processed connects, the output end of the multistage temperature comparison circuit and the second input terminal of the control circuit
Connection, the control circuit are used for the defeated of the output valve of the multi-stage current comparison circuit and the multistage temperature comparison circuit
It is worth out and is combined by default trade-off relationship, in order to passes through MPPT core described in the temperature and the conducting electric current co- controlling
The working condition of piece；
The output end of the multi-stage current comparison circuit includes that first voltage output end, second voltage output end and tertiary voltage are defeated
Outlet, the first input end of the control circuit include first voltage input terminal, second voltage input terminal and tertiary voltage input
End, the first voltage output end of the multi-stage current comparison circuit are connect with the first voltage input terminal of the control circuit, institute
The second voltage output end for stating multi-stage current comparison circuit is connect with the second voltage input terminal of the control circuit, described multistage
The tertiary voltage output end of current comparison circuit is connect with the tertiary voltage input terminal of the control circuit；
The multi-stage current comparison circuit includes first resistor, second resistance, 3rd resistor, first comparator, the second comparator
And third comparator, in which:
The first end of the first resistor is connect with the input terminal of the first comparator, and common end is as the multi-stage current
The output end of the input terminal of comparison circuit, the first comparator is exported as the first voltage of the multi-stage current comparison circuit
End, the second end of the first resistor connect with the input terminal of the first end of the second resistance and second comparator respectively
It connects, second voltage output end of the output end of second comparator as the multi-stage current comparison circuit, second electricity
The second end of resistance is connect with the input terminal of the first end of the 3rd resistor and the third comparator respectively, and the third compares
Tertiary voltage output end of the output end of device as the multi-stage current comparison circuit, the second end ground connection of the 3rd resistor,
Output end of the reference edge of the first comparator, second comparator and the third comparator with the first DC power supply
Connection；
The output end of the multistage temperature comparison circuit includes that the 4th voltage output end, the 5th voltage output end and the 6th voltage are defeated
Outlet, the second input terminal of the control circuit include the 4th voltage input end, the 5th voltage input end and the 6th voltage input
End, the 4th voltage output end of the multistage temperature comparison circuit are connect with the 4th voltage input end of the control circuit, institute
The 5th voltage output end for stating multistage temperature comparison circuit is connect with the 5th voltage input end of the control circuit, described multistage
6th voltage output end of temperature comparison circuit is connect with the 6th voltage input end of the control circuit；
The multistage temperature comparison circuit includes the 4th resistance, the 5th resistance, the 6th resistance, the 4th comparator, the 5th comparator
And the 6th comparator, in which:
The first end of 4th resistance is connect with the input terminal of the 4th comparator, and common end is as the multistage temperature
The input terminal of comparison circuit, fourth voltage output of the output end of the 4th comparator as the multistage temperature comparison circuit
End, the second end of the 4th resistance connect with the input terminal of the first end of the 5th resistance and the 5th comparator respectively
It connects, fiveth voltage output end of the output end of the 5th comparator as the multistage temperature comparison circuit, the 5th electricity
The second end of resistance is connect with the input terminal of the first end of the 6th resistance and the 6th comparator respectively, and the described 6th compares
Sixth voltage output end of the output end of device as the multistage temperature comparison circuit, the second end ground connection of the 6th resistance,
Output end of the reference edge of 4th comparator, the 5th comparator and the 6th comparator with the second DC power supply
Connection；
The control circuit include the first NOT gate, the second NOT gate, third NOT gate, the one or three input with door, the two or three input with door,
Three or three input and door, the one or two input and door, the two or two input and door, the three or two input and door, four input nor gates,
In:
The input terminal of first NOT gate inputs respectively with the one or three input with the first input end of door and the two or three and door
First input end connection, fourth voltage input end of the common end as the control circuit, the output of first NOT gate
End connect with the three or three input with the first input end of door, the input terminal of second NOT gate with the described 1st input and
Door the second input terminal connection, fiveth voltage input end of the common end as the control circuit, second NOT gate it is defeated
Outlet is connect with the two or three input with the second input terminal of door and the three or three input with the second input terminal of door respectively,
The input terminal of the third NOT gate is connect with the first input end of the four inputs nor gate, and common end is as the control electricity
6th voltage input end on road, the output end of the third NOT gate respectively with the one or three input and the third input terminal of door,
Two or three input is connect with the third input terminal of door and the three or three input with the third input terminal of door, the one or three input and door
Output end connect with the one or two input with the first input end of door, the second input terminal work of the one or two input and door
For the first voltage input terminal of the control circuit, the one or two input inputs nor gate with the output end of door and described four
The connection of second input terminal, the two or three input and the output end of door connect with the two or two input and the first input end of door
It connects, second voltage input terminal of the second input terminal of the two or two input and door as the control circuit, the described 2nd 2
It inputs and is connect with the output end of door with the third input terminal of the four inputs nor gate, the output end of the three or three input and door
It is connect with the three or two input with the first input end of door, the second input terminal of the three or two input and door is as the control
The tertiary voltage input terminal of circuit processed, the 4th input of the three or two input and the output end and the four inputs nor gate of door
End connection, output end of the output end of the four inputs nor gate as the control circuit.
2. protection circuit as described in claim 1, which is characterized in that the multi-stage current comparison circuit further includes first shockproof
Circuit, the second shockproof circuit and the shockproof circuit of third, in which:
The input terminal of the first shockproof circuit is connect with the output end of the first comparator, the first shockproof circuit it is defeated
First voltage output end of the outlet as the multi-stage current comparison circuit, the input terminal of the second shockproof circuit and described the
The output end of two comparators connects, second electricity of the output end of the second shockproof circuit as the multi-stage current comparison circuit
Output end is pressed, the input terminal of the shockproof circuit of third is connect with the output end of the third comparator, the shockproof circuit of third
Tertiary voltage output end of the output end as the multi-stage current comparison circuit.
3. protection circuit as claimed in claim 2, which is characterized in that the first shockproof circuit, the second shockproof circuit
And the shockproof circuit of third is Schmitt trigger or hysteresis comparator.
4. protection circuit as claimed in claim 3, which is characterized in that the multistage temperature comparison circuit further includes the 4th shockproof
Circuit, the 5th shockproof circuit and the 6th shockproof circuit, in which:
The input terminal of the 4th shockproof circuit is connect with the output end of the 4th comparator, the 4th shockproof circuit it is defeated
Fourth voltage output end of the outlet as the multistage temperature comparison circuit, the input terminal of the 5th shockproof circuit and described the
The output end of five comparators connects, fiveth electricity of the output end of the 5th shockproof circuit as the multistage temperature comparison circuit
Output end is pressed, the input terminal of the 6th shockproof circuit is connect with the output end of the 6th comparator, the 6th shockproof circuit
Sixth voltage output end of the output end as the multistage temperature comparison circuit.
5. protection circuit as claimed in claim 4, which is characterized in that the 4th shockproof circuit, the 5th shockproof circuit
And the 6th shockproof circuit is Schmitt trigger or hysteresis comparator.
6. a kind of MPPT chip, which is characterized in that the protection circuit including excess-current excess-temperature as described in any one in claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711340457.7A CN107919654B (en) | 2017-12-14 | 2017-12-14 | A kind of the protection circuit and MPPT chip of excess-current excess-temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711340457.7A CN107919654B (en) | 2017-12-14 | 2017-12-14 | A kind of the protection circuit and MPPT chip of excess-current excess-temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107919654A CN107919654A (en) | 2018-04-17 |
| CN107919654B true CN107919654B (en) | 2019-07-09 |
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| CN201711340457.7A Active CN107919654B (en) | 2017-12-14 | 2017-12-14 | A kind of the protection circuit and MPPT chip of excess-current excess-temperature |
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| CN112615354B (en) * | 2020-12-17 | 2023-04-25 | 西安易朴通讯技术有限公司 | Overcurrent protection circuit, buck circuit and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3254159B2 (en) * | 1997-02-04 | 2002-02-04 | セイコーインスツルメンツ株式会社 | Charge / discharge control circuit |
| CN102983562B (en) * | 2012-12-14 | 2015-06-24 | 上海诚佳电子科技有限公司 | Current-limiting protector for electrical fire prevention |
| CN105826903B (en) * | 2016-04-19 | 2018-10-12 | 无锡中感微电子股份有限公司 | A kind of temperature detection, protection circuit and system |
| CN106300246B (en) * | 2016-09-30 | 2018-08-28 | 英特格灵芯片(天津)有限公司 | Overvoltage crowbar |
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