CN107919654A - The protection circuit and MPPT chips of a kind of excess-current excess-temperature - Google Patents
The protection circuit and MPPT chips of a kind of excess-current excess-temperature Download PDFInfo
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- CN107919654A CN107919654A CN201711340457.7A CN201711340457A CN107919654A CN 107919654 A CN107919654 A CN 107919654A CN 201711340457 A CN201711340457 A CN 201711340457A CN 107919654 A CN107919654 A CN 107919654A
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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
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Abstract
The present invention provides the protection circuit and MPPT chips of a kind of excess-current excess-temperature; including sample rate current source, multi-stage current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit; the output terminal in sample rate current source is connected with the input terminal of multi-stage current comparison circuit; the output terminal in temperature current source is connected with the input terminal of multistage temperature comparison circuit; the output terminal of multi-stage current comparison circuit and the first input end of control circuit connect, and the output terminal of multistage temperature comparison circuit and the second input terminal of control circuit connect.The application realizes the working status by temperature and conducting electric current co- controlling MPPT chips, i.e. when temperature is higher, conducting electric current is also higher, the two can co- controlling MPPT chips be stopped, avoid MPPT chips and produce the phenomenon seriously generated heat, so as to improve the safety and reliability of MPPT chips.
Description
Technical field
The present invention relates to circuit protection technical field, more particularly to the protection circuit and MPPT cores of a kind of excess-current excess-temperature
Piece.
Background technology
With the development of heliotechnics, the application of solar cell is more and more extensive.Solar cell is to pass through photovoltaic
Plate converts light energy into electric energy, in order to improve transfer efficiency, it will usually connects chip-scale in the output terminal of photovoltaic panel
MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) system, so as to fulfill the tracking of maximum power
And conversion.In the prior art, it is contemplated that MPPT chips can be subject to the shadows such as ambient temperature, photovoltaic panel output current and hot spot effect
Ring, cause it to produce different degrees of fever phenomenon, or even can be burned out, MPPT chips would generally add thermal-shutdown circuit and
Current foldback circuit, when the temperature of chip reaches certain high temperature, thermal-shutdown circuit meeting control chip is stopped, or works as
When the conducting electric current of chip reaches certain value, current foldback circuit meeting control chip is stopped, so as 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
Degree is higher, conducting electric current is also higher and is not enough to control chip when being stopped, and the fever phenomenon of MPPT chips is also that comparison is tight
Weight, so as to reduce the safety and reliability of MPPT chips.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
The content of the invention
The object of the present invention is to provide the protection circuit and MPPT chips 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 chips be stopped, avoid MPPT chips and produce and seriously generate heat
Phenomenon, so as to improve the safety and reliability of MPPT chips.
In order to solve the above technical problems, the present invention provides a kind of protection circuit of excess-current excess-temperature, applied to MPPT chips,
Sample rate current source including the conducting electric current for sampling the MPPT chips, for according to the conducting electric current set it is multistage
Multi-stage current comparison circuit, the input current of current threshold the temperature current source directly proportional to the temperature of the MPPT chips, use
In multistage temperature comparison circuit and control circuit according to the multistage temperature threshold of the temperature setting, wherein：
The output terminal in the sample rate current source is connected with the input terminal of the multi-stage current comparison circuit, the temperature current
The output terminal in source is connected with the input terminal of the multistage temperature comparison circuit, the output terminal of the multi-stage current comparison circuit and institute
State the first input end connection of control circuit, the output terminal of the multistage temperature comparison circuit and the second of the control circuit 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 be combined by default trade-off relationship, in order to by described in the temperature and the conducting electric current co- controlling
The working status of MPPT chips.
Preferably, the output terminal of the multi-stage current comparison circuit includes first voltage output terminal, second voltage output terminal
And tertiary voltage output terminal, 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 terminal and the first voltage of the control circuit of the multi-stage current comparison circuit are defeated
Enter end connection, the second voltage output terminal of the multi-stage current comparison circuit connects with the second voltage input terminal of the control circuit
Connect, the tertiary voltage output terminal of the multi-stage current comparison circuit is connected 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 the 3rd comparator, wherein：
The first end of the first resistor is connected with the input terminal of the first comparator, its common port is as described multistage
The input terminal of current comparison circuit, the first voltage of the output terminal of the first comparator as the multi-stage current comparison circuit
Output terminal, the second end of the first resistor respectively with the first end of the second resistance and the input terminal of second comparator
Connection, the second voltage output terminal of the output terminal of second comparator as the multi-stage current comparison circuit, described second
The second end of resistance is connected with the first end of the 3rd resistor and the input terminal of the 3rd comparator respectively, the 3rd ratio
Compared with tertiary voltage output terminal of the output terminal as the multi-stage current comparison circuit of device, the second termination of the 3rd resistor
Ground, the reference edge of the first comparator, second comparator and the 3rd comparator are defeated with the first DC power supply
Outlet connects.
Preferably, it is shockproof to further include the first shockproof circuit, the second shockproof circuit and the 3rd for the multi-stage current comparison circuit
Circuit, wherein：
The input terminal of the first shockproof circuit is connected with the output terminal of the first comparator, the first shockproof circuit
First voltage output terminal of the output terminal as the multi-stage current comparison circuit, the input terminal of the second shockproof circuit and institute
State the output terminal connection of the second comparator, the output terminal of the second shockproof circuit as the multi-stage current comparison circuit the
Two voltage output ends, the input terminal on three proofings seismoelectric road are connected with the output terminal of the 3rd comparator, the three proofings seismoelectric
Tertiary voltage output terminal of the output terminal on road as the multi-stage current comparison circuit.
Preferably, the described first shockproof circuit, the second shockproof circuit and the three proofings seismoelectric road are Schmitt
Trigger or hysteresis comparator.
Preferably, the output terminal 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 and the 4th voltage of the control circuit of the multistage temperature comparison circuit are defeated
Enter end connection, the 5th voltage output end of the multistage temperature comparison circuit connects with the 5th voltage input end of the control circuit
Connect, the 6th voltage output end of the multistage temperature comparison circuit is connected 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, wherein：
The first end of 4th resistance is connected with the input terminal of the 4th comparator, its common port is as described multistage
The input terminal of temperature comparison circuit, the 4th voltage of the output terminal of the 4th comparator as the multistage temperature comparison circuit
Output terminal, the second end of the 4th resistance respectively with the first end of the 5th resistance and the input terminal of the 5th comparator
Connection, the 5th voltage output end of the output terminal of the 5th comparator as the multistage temperature comparison circuit, the described 5th
The second end of resistance is connected with the first end of the 6th resistance and the input terminal of the 6th comparator respectively, the 6th ratio
Compared with sixth voltage output end of the output terminal as the multistage temperature comparison circuit of device, the second termination of the 6th resistance
Ground, the reference edge of the 4th comparator, the 5th comparator and the 6th comparator are defeated with the second DC power supply
Outlet connects.
Preferably, it is shockproof to further include the 4th shockproof circuit, the 5th shockproof circuit and the 6th for the multistage temperature comparison circuit
Circuit, wherein：
The input terminal of the 4th shockproof circuit is connected with the output terminal of the 4th comparator, the 4th shockproof circuit
Fourth voltage output end of the output terminal as the multistage temperature comparison circuit, the input terminal of the 5th shockproof circuit and institute
State the output terminal connection of the 5th comparator, the output terminal 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 connected with the output terminal of the 6th comparator, the 6th anti-seismoelectric
Sixth voltage output end of the output terminal 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, the 3rd 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, wherein：
The input terminal of first NOT gate is inputted with the described 1st input with the first input end of door and the two or three respectively
It is connected with the first input end of door, fourth voltage input end of its common port as the control circuit, first NOT gate
Output terminal is connected with the first input end of door with the described 3rd 3 input, the input terminal of second NOT gate and the described 1st defeated
Enter and be connected with the second input terminal of door, fiveth voltage input end of its common port as the control circuit, second NOT gate
Output terminal respectively with the described 2nd 3 input and the second input terminal of door and the three or three input and the second input terminal of door
Connection, the input terminal of the 3rd NOT gate is connected with the first input end of described four input nor gates, described in the conduct of its common port
6th voltage input end of control circuit, the output terminal of the 3rd NOT gate are defeated with the 3rd of the described 1st input and door respectively
Enter end, the two or three input is inputted with the 3rd input terminal of door and the three or three and is connected with the 3rd input terminal of door, the described 1st is defeated
Enter and be connected with the output terminal of door with the described 1st 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 output terminal of the one or two input and door inputted with described four or
The second input terminal connection of NOT gate, output terminal and described two two input and first input of door of the two or three input with door
End connection, the two or two input and the second voltage input terminal of the second input terminal of door as the control circuit, described the
Two or two inputs are connected with the output terminal of door with the 3rd input terminal of described four input nor gates, and the three or three input is defeated with door
Outlet is connected with the described 3rd 2 input with the first input end of door, and the second input terminal of the three or two input and door is as institute
State the tertiary voltage input terminal of control circuit, the three or two input and the output terminal and the 4th of described four input nor gates of door
Input terminal connects, and described four input output terminal of the output terminal of nor gate as the control circuit.
In order to solve the above technical problems, present invention also offers a kind of MPPT chips, 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, applied to MPPT chips, including it is sample rate current source, multistage
Current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit, the output terminal in sample rate current source and multistage electricity
The input terminal connection of comparison circuit is flowed, the output terminal in temperature current source is connected with the input terminal of multistage temperature comparison circuit, multistage
The output terminal of current comparison circuit and the first input end of control circuit connect, the output terminal of multistage temperature comparison circuit and control
The second input terminal connection of circuit.
Compared with the thermal-shutdown circuit and current foldback circuit of monodrome of the prior art control, the protection electricity of the application
Road leading for MPPT chips by the input current of the conducting electric currents of sample rate current source sampling MPPT chips, namely sample rate current source
Galvanization；Pass through the temperature of temperature current source sampling MPPT chips, namely the input current in temperature current source and MPPT chips
Temperature is directly proportional.The output current in sample rate current source is inputted to multistage current comparison circuit, and multi-stage current comparison circuit is used to set
Put the current threshold of different phase；The output current in temperature current source, which is inputted to multistage temperature comparison circuit, multistage temperature, to be compared
Circuit is used for the temperature threshold for setting different phase.Eventually through the trade-off relationship that control circuit is set by the output valve of the two
With reference to so as to fulfill the working status of temperature and conducting electric current co- controlling MPPT chips is passed through.
As it can be seen that the protection circuit of the application, when temperature is higher, conducting electric current is also higher, the two can co- controlling
MPPT chips are stopped, and avoid MPPT chips and produce the phenomenon seriously generated heat, so as to improve the security of MPPT chips
And reliability.
Present invention also offers a kind of MPPT chips, have identical beneficial effect with above-mentioned protection circuit.
Brief description of the drawings
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, drawings in the following description are only some implementations of the present 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 structure diagram of the protection circuit of excess-current excess-temperature provided by the invention；
Fig. 2 is the concrete structure schematic diagram of the multi-stage current comparison circuit shown in Fig. 1；
Fig. 3 is the concrete structure schematic diagram of the multistage temperature comparison circuit shown in Fig. 1；
Fig. 4 is the concrete structure schematic diagram of the control circuit shown in Fig. 1.
Embodiment
The core of the present invention is to provide the protection circuit and MPPT chips 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 chips be stopped, avoid MPPT chips and produce and seriously generate heat
Phenomenon, so as to improve the safety and reliability of MPPT chips.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
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
All other embodiments obtained without making creative work, belong to the scope of protection of the invention.
Fig. 1 is refer to, Fig. 1 is a kind of structure diagram of the protection circuit of excess-current excess-temperature provided by the invention.
The protection circuit is applied to MPPT chips, including the sample rate current source 1 of the conducting electric current for sampling MPPT chips,
Temperature for the multi-stage current comparison circuit 2 according to the multistage current threshold of conducting electric current setting, input current and MPPT chips
Spend directly proportional temperature current source 3, for the multistage temperature comparison circuit 4 according to the multistage temperature threshold of temperature setting and control
Circuit 5, wherein：
The output terminal in sample rate current source 1 is connected with the input terminal of multi-stage current comparison circuit 2, the output in temperature current source 3
End is connected with the input terminal of multistage temperature comparison circuit 4, the output terminal of multi-stage current comparison circuit 2 and the first of control circuit 5
Input terminal connects, and the output terminal of multistage temperature comparison circuit 4 is connected 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 status of temperature and conducting electric current co- controlling MPPT chips.
It should be noted that default in the application sets in advance, it is only necessary to sets once, unless according to reality
Situation needs to change, and otherwise need not reset.
Specifically, the application provide overtemperature and overcurrent 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 chips
Electric current and temperature are sampled respectively, and the application samples the conducting electric current of MPPT chips using sample rate current source 1, makes it
Input current is the conducting electric current of MPPT chips, and the size of current in sample rate current source 1 is only by the conducting electric current of MPPT chips
Influence.The application samples the temperature of MPPT chips using temperature current source 3, and the principle in temperature current source 3 is defeated for its
Enter that electric current is directly proportional to the temperature of MPPT chips, the temperature that MPPT chips are correspondingly reflected by size of current therein is high
It is low.
The output current in sample rate current source 1 is inputted can be with MPPT chips to multistage current comparison circuit 2, output current
The change of conducting electric current and change, multi-stage current comparison circuit 2 is by the output current sublevel in sample rate current source 1, namely multistage electricity
The output of stream comparison circuit 2 can change with the output current of 1 different phase of sample rate current source.For example, multi-stage current ratio
The output 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 going out electric current and being less than I1, the output valve of multi-stage current comparison circuit 2 is identical；When the output current in sample rate current source 1 is more than or equal to
I1 and when being less than I2, the output valve of multi-stage current comparison circuit 2 is identical；When the output 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 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 simultaneously differs, so as to fulfill multistage current threshold is set.
Similarly, the output current in temperature current source 3 is inputted to multistage temperature comparison circuit 4, and output current can be with
The change of the temperature of MPPT chips and change, multistage temperature comparison circuit 4 by the output current sublevel in temperature current source 3, namely
The temperature sublevel that temperature current source 3 is sampled, so as to fulfill multistage temperature threshold is set.
The output valve of multi-stage current comparison circuit 2 and multistage temperature comparison circuit 4 is inputted to control circuit 5, control electricity
The output valve of the two is combined by road 5 according to the trade-off relationship set inside it, and trade-off relationship here is by MPPT chips
Temperature and conducting electric current combine, the working status of co- controlling MPPT chips, it is higher to be primarily directed to temperature, leads
Galvanization also higher situation, at this time both multi-stage current comparison circuit 2 and multistage temperature comparison circuit 4 combine, can control
MPPT chips processed are stopped, and suppress each other equivalent to temperature and conducting electric current, collective effect, avoid MPPT chips and produce sternly
The phenomenon of heat is retransmitted, so as to improve the safety and reliability of MPPT chips.
The present invention provides a kind of protection circuit of excess-current excess-temperature, applied to MPPT chips, including it is sample rate current source, multistage
Current comparison circuit, temperature current source, multistage temperature comparison circuit and control circuit, the output terminal in sample rate current source and multistage electricity
The input terminal connection of comparison circuit is flowed, the output terminal in temperature current source is connected with the input terminal of multistage temperature comparison circuit, multistage
The output terminal of current comparison circuit and the first input end of control circuit connect, the output terminal of multistage temperature comparison circuit and control
The second input terminal connection of circuit.
Compared with the thermal-shutdown circuit and current foldback circuit of monodrome of the prior art control, the protection electricity of the application
Road leading for MPPT chips by the input current of the conducting electric currents of sample rate current source sampling MPPT chips, namely sample rate current source
Galvanization；Pass through the temperature of temperature current source sampling MPPT chips, namely the input current in temperature current source and MPPT chips
Temperature is directly proportional.The output current in sample rate current source is inputted to multistage current comparison circuit, and multi-stage current comparison circuit is used to set
Put the current threshold of different phase；The output current in temperature current source, which is inputted to multistage temperature comparison circuit, multistage temperature, to be compared
Circuit is used for the temperature threshold for setting different phase.Eventually through the trade-off relationship that control circuit is set by the output valve of the two
With reference to so as to fulfill the working status of temperature and conducting electric current co- controlling MPPT chips is passed through.
As it can be seen that the protection circuit of the application, when temperature is higher, conducting electric current is also higher, the two can co- controlling
MPPT chips are stopped, and avoid MPPT chips and produce the phenomenon seriously generated heat, so as to improve the security of MPPT chips
And reliability.
On the basis of above-described embodiment：
Fig. 2 is refer to, Fig. 2 is the concrete structure schematic diagram of the multi-stage current comparison circuit shown in Fig. 1.
As a kind of preferred embodiment, the output terminal of multi-stage current comparison circuit 2 includes first voltage output terminal, second
Voltage output end and tertiary voltage output terminal, the first input end of control circuit 5 are defeated including first voltage input terminal, second voltage
Enter end and tertiary voltage input terminal, the first voltage output terminal and the first voltage of control circuit 5 of multi-stage current comparison circuit 2 are defeated
Enter end connection, the second voltage output terminal of multi-stage current comparison circuit 2 is connected with the second voltage input terminal of control circuit 5, more
The tertiary voltage output terminal of rank current comparison circuit 2 is connected 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 the 3rd comparator A3, wherein：
The first end of first resistor R1 is connected with the input terminal of first comparator A1, its common port compares as multi-stage current
The input terminal of circuit 2, the first voltage output terminal of the output terminal of first comparator A1 as multi-stage current comparison circuit 2, first
The second end of resistance R1 is connected with the first end of second resistance R2 and the input terminal of the second comparator A2 respectively, the second comparator A2
Second voltage output terminal of the output terminal as multi-stage current comparison circuit 2, the second end of second resistance R2 respectively with the 3rd electricity
Hinder the first end of R3 and the input terminal connection of the 3rd comparator A3, the output terminal of the 3rd comparator A3 are more electric as multi-stage current
The tertiary voltage output terminal on road 2, the second end ground connection of 3rd resistor R3, first comparator A1, the second comparator A2 and the 3rd ratio
Output terminal of the reference edge with the first DC power supply compared with device A3 is connected.
Specifically, as shown in Figure 2, the output voltage of the first DC power supply is VREF1, voltage on the basis of it.Sample rate current
The output current in source 1 produces 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, the voltage V3 of first end of voltage V2 and 3rd resistor R3 of first end of second resistance R2 lead to respectively
Each connected comparator is crossed compared with same reference voltage V REF1.Due to V1 ＞ V2 ＞ V3, so the output of comparator
It is first comparator A1, the second comparator A2 and the 3rd comparator A3 to be changed into 1 order from 0.If when the output in sample rate current source 1
When electric current reaches Isense1, the output valve VOUT1 of the output terminal of first comparator A1 is changed into 1 from 0, defeated when sample rate current source 1
When going out electric current and reaching Isense2, the output valve VOUT2 of the output terminal of the second comparator A2 is changed into 1 from 0, when sample rate current source 1
When output current reaches Isense3, the output valve VOUT3 of the output terminal of the 3rd comparator A3 is changed into 1 from 0, then Isense1 ＜
Isense2 ＜ Isense3, so as to be provided with three rank current thresholds.Then the output current Isense in sample rate current source 1 and multistage electricity
Flow the following form of relation 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 three proofings seismoelectric road, wherein：
The input terminal of first shockproof circuit is connected with the output terminal of first comparator A1, and the output terminal of the first shockproof circuit is made
For the first voltage output terminal 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, the second voltage output terminal of the output terminal of the second shockproof circuit as multi-stage current comparison circuit 2, three proofings seismoelectric road
Input terminal be connected with the output terminal of the 3rd comparator A3, the output terminal on three proofings seismoelectric road is as multi-stage current comparison circuit 2
Tertiary voltage output terminal.
Specifically, it is contemplated that when the input signal of comparator has less interference near threshold value, then output voltage meeting
Corresponding concussion is produced, output terminal of the application in first comparator A1, the second comparator A2 and the 3rd comparator A3 is all connected with
One shockproof circuit, prevents that three comparators shake, and carry when the output current in sample rate current source 1 is close to current threshold
The high stability and reliability of system.
As a kind of preferred embodiment, the first shockproof circuit, the second shockproof circuit and three proofings seismoelectric road 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 three proofings seismoelectric road.Schmitt trigger is used to prevent input voltage from minor variations occur and cause
Output voltage change, there is stronger antijamming capability.Hysteresis comparator, which is one, has sluggish winding transmission characteristic
Comparator, introduces positive feedback network, equally with stronger anti-interference on the basis of anti-phase input simple gate voltage limit comparator
Ability.
Certainly, the first shockproof circuit, the second shockproof circuit and three proofings seismoelectric road in the application can also select other
Shockproof device, the application are not particularly limited herein.
Fig. 3 is refer to, Fig. 3 is the concrete structure schematic diagram of the multistage temperature comparison circuit shown in Fig. 1.
As a kind of preferred embodiment, the output terminal of multistage temperature comparison circuit 4 includes the 4th voltage output end, the 5th
Voltage output end and the 6th voltage output end, the second input terminal of control circuit 5 are defeated including the 4th voltage input end, the 5th voltage
Enter end and the 6th voltage input end, the 4th voltage output end and the 4th voltage of control circuit 5 of multistage temperature comparison circuit 4 are defeated
Enter end connection, the 5th voltage output end of multistage temperature comparison circuit 4 is connected with the 5th voltage input end of control circuit 5, more
6th voltage output end of rank temperature comparison circuit 4 is connected 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, wherein：
The first end of 4th resistance R4 is connected with the input terminal of the 4th comparator A4, its common port compares as multistage temperature
The input terminal of circuit 4, the 4th voltage output end of the output terminal of the 4th comparator A4 as multistage temperature comparison circuit 4, the 4th
The second end of resistance R4 is connected with the first end of the 5th resistance R5 and the input terminal of the 5th comparator A5 respectively, the 5th comparator A5
Fiveth voltage output end of the output terminal as multistage temperature comparison circuit 4, the second end of the 5th resistance R5 respectively with the 6th electricity
Hinder the first end of R6 and the input terminal connection of the 6th comparator A6, the output terminal of the 6th comparator A6 are 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
Output terminal of the reference edge with the second DC power supply compared with device A6 is connected.
Similarly, from the figure 3, it may be seen that the output voltage of the second DC power supply is VREF2, voltage on the basis of it.Temperature current
The output current in source 3 produces 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 voltage V6 of first end of voltage V5 and the 6th resistance R6 of first end of the 5th resistance R5 lead to respectively
Each connected comparator is crossed compared with same reference voltage V REF2.Due to V4 ＞ V5 ＞ V6, so the output of comparator
It is the 4th comparator A4, the 5th comparator A5 and the 6th comparator A6 to be changed into 1 order from 0.If sampled when temperature current source 3
When temperature reaches T4, the output valve VOUT4 of the output terminal of the 4th comparator A4 is changed into 1 from 0, when the temperature that temperature current source 3 samples
When degree reaches T5, the output valve VOUT5 of the output terminal of the 5th comparator A5 is changed into 1 from 0, when the temperature that temperature current source 3 samples
When reaching T6, the output valve VOUT6 of the output terminal of the 6th comparator A6 is changed into 1 from 0, then T4 ＜ T5 ＜ T6, so that there is provided three
Rank temperature threshold.The temperature T and the following form of relation of the output valve of 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, wherein：
The input terminal of 4th shockproof circuit is connected with the output terminal of the 4th comparator A4, and the output terminal 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, the 5th voltage output end of the output terminal of the 5th shockproof circuit as multistage temperature comparison circuit 4, the 6th shockproof circuit
Input terminal be connected with the output terminal of the 6th comparator A6, the output terminal 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 less interference near threshold value, then output voltage meeting
Corresponding concussion is produced, output terminal 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 the temperature for preventing from sampling in temperature current source 3 is 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.
Fig. 4 is refer to, Fig. 4 is the concrete structure schematic diagram of the 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, the 3rd NOT gate 13, the
One or three inputs are inputted with the input of door the 22, the 3rd 3 with the input of door the 21, the 2nd 3 with the input of door the 23, the 1st with door the 31, the 2nd 2
Nor gate 41 is inputted with door 33, four with the input of door the 32, the 3rd 2, wherein：
The input terminal of first NOT gate 11 is inputted 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 its common port as control circuit 5, the output terminal of the first NOT gate 11 and
Three or three input is connected 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 its common port as control circuit 5, the output terminal of the second NOT gate 12 is respectively with the two or three
Input is connected with the second input terminal of door 23 with the second input terminal of door 22 and the three or three input, the input terminal of the 3rd NOT gate 13 and
The first input end connection of four input nor gates 41, sixth voltage input end of its common port as control circuit 5, the 3rd NOT gate
13 output terminal respectively with the one or three input and the 3rd input terminal of door 21, the 3rd input terminal of the two or three input and door 22 and the
Three or three inputs be connecteds with the 3rd input terminal of door 23, the one or three input inputted with the output terminal 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 be connected with the output terminal of door 31 with the second input terminal of four input nor gates 41, the two or three input and the output terminal of door 22 and
Two or two input is connected 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 connected with the output terminal of door 32 with the 3rd input terminal of four input nor gates 41, and the 3rd
Three inputs are connected with the output terminal 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 terminal of door 33 and four input nor gates 41
The connection of the 4th input terminal, output terminal of the output terminal as control circuit 5 of four input nor gates 41.
It should be noted that the identical port of the magnitude of voltage of Fig. 4 represents to link together.Specifically, the control of the application
The trade-off relationship of circuit 5 is designed 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 cores
During the temperature T ＜ T4 of piece, overcurrent turn-off function threshold value is Isense3, i.e., conducting electric current once reaches Isense3, controls MPPT chips
Do not work；As T4≤T<During 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<During T6, overcurrent turn-off function threshold value is Isense1, i.e. conducting electric current once reaches Isense1, control
MPPT chips do not work；As temperature T >=T6, for maximum overheat protector point, control MPPT chips do not work.It is that is, warm
Degree is located at the higher stage, and overcurrent turn-off function threshold value is lower, and the working status of the two co- controlling MPPT chips, prevents MPPT chips
The phenomenon seriously generated heat produces, and improves the safety and reliability of MPPT chips.Moreover, temperature reaches maximum overheat protector
The size of point, not tube current, directly controls MPPT chips and does not work, and extends the service life of MPPT chips.
Present invention also offers a kind of MPPT chips, include the protection circuit of any of the above-described kind of excess-current excess-temperature.
The introduction of MPPT chips provided by the invention refer to above-mentioned protection circuit embodiments, and the present invention is no longer superfluous herein
State.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
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 order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there are other identical element in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for 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, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (9)
1. the protection circuit of a kind of excess-current excess-temperature, applied to MPPT chips, it is characterised in that including for sampling the MPPT cores
The sample rate current source of the conducting electric current of piece, for being set the multi-stage current of multistage current threshold to compare according to the conducting electric current
Circuit, input current the temperature current source directly proportional to the temperature of the MPPT chips, for multistage according to the temperature setting
Temperature threshold multistage temperature comparison circuit and control circuit, wherein：
The output terminal in the sample rate current source is connected with the input terminal of the multi-stage current comparison circuit, the temperature current source
Output terminal is connected with the input terminal of the multistage temperature comparison circuit, output terminal and the control of the multi-stage current comparison circuit
The first input end connection of circuit processed, the output terminal 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
Go out value to be combined by default trade-off relationship, in order to pass through MPPT cores described in the temperature and the conducting electric current co- controlling
The working status of piece.
2. protection circuit as claimed in claim 1, it is characterised in that the output terminal of the multi-stage current comparison circuit includes the
One voltage output end, second voltage output terminal and tertiary voltage output terminal, the first input end of the control circuit include first
Voltage input end, second voltage input terminal and tertiary voltage input terminal, the first voltage output of the multi-stage current comparison circuit
End is connected with the first voltage input terminal of the control circuit, the second voltage output terminal of the multi-stage current comparison circuit and institute
State the second voltage input terminal connection of control circuit, tertiary voltage output terminal and the control of the multi-stage current comparison circuit
The tertiary voltage input terminal connection of circuit；
The multi-stage current comparison circuit includes first resistor, second resistance, 3rd resistor, first comparator, the second comparator
And the 3rd comparator, wherein：
The first end of the first resistor is connected with the input terminal of the first comparator, its common port is as the multi-stage current
The input terminal of comparison circuit, the output terminal of the first comparator are exported as the first voltage of the multi-stage current comparison circuit
End, the second end of the first resistor connect with the first end of the second resistance and the input terminal of second comparator respectively
Connect, the second voltage output terminal of the output terminal of second comparator as the multi-stage current comparison circuit, second electricity
The second end of resistance is connected with the first end of the 3rd resistor and the input terminal of the 3rd comparator respectively, and the described 3rd compares
Tertiary voltage output terminal of the output terminal of device as the multi-stage current comparison circuit, the second end ground connection of the 3rd resistor,
Output terminal of the reference edge of the first comparator, second comparator and the 3rd comparator with the first DC power supply
Connection.
3. protection circuit as claimed in claim 2, it is characterised in that it is shockproof that the multi-stage current comparison circuit further includes first
Circuit, the second shockproof circuit and three proofings seismoelectric road, wherein：
The input terminal of the first shockproof circuit is connected with the output terminal of the first comparator, the first shockproof circuit it is defeated
First voltage output terminal of the outlet as the multi-stage current comparison circuit, the input terminal of the second shockproof circuit and described the
The output terminal connection of two comparators, the second electricity of the output terminal of the second shockproof circuit as the multi-stage current comparison circuit
Output terminal is pressed, the input terminal on three proofings seismoelectric road is connected with the output terminal of the 3rd comparator, the three proofings seismoelectric road
Tertiary voltage output terminal of the output terminal as the multi-stage current comparison circuit.
4. protection circuit as claimed in claim 3, it is characterised in that the first shockproof circuit, the second shockproof circuit
And the three proofings seismoelectric road is Schmitt trigger or hysteresis comparator.
5. protection circuit as claimed in claim 2, it is characterised in that the output terminal of the multistage temperature comparison circuit includes the
Four voltage output ends, 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 the 6th voltage input end, the 4th voltage output of the multistage temperature comparison circuit
End is connected with the 4th voltage input end of the control circuit, the 5th voltage output end of the multistage temperature comparison circuit and institute
State the 5th voltage input end connection of control circuit, the 6th voltage output end and the control of the multistage temperature comparison circuit
The 6th voltage input end connection of 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, wherein：
The first end of 4th resistance is connected with the input terminal of the 4th comparator, its common port is as the multistage temperature
The input terminal of comparison circuit, the 4th voltage output of the output terminal of the 4th comparator as the multistage temperature comparison circuit
End, the second end of the 4th resistance connect with the first end of the 5th resistance and the input terminal of the 5th comparator respectively
Connect, the 5th voltage output end of the output terminal of the 5th comparator as the multistage temperature comparison circuit, the 5th electricity
The second end of resistance is connected with the first end of the 6th resistance and the input terminal of the 6th comparator respectively, and the described 6th compares
Sixth voltage output end of the output terminal of device as the multistage temperature comparison circuit, the second end ground connection of the 6th resistance,
Output terminal of the reference edge of 4th comparator, the 5th comparator and the 6th comparator with the second DC power supply
Connection.
6. protection circuit as claimed in claim 5, it is characterised in that it is shockproof that the multistage temperature comparison circuit further includes the 4th
Circuit, the 5th shockproof circuit and the 6th shockproof circuit, wherein：
The input terminal of the 4th shockproof circuit is connected with the output terminal 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 terminal connection of five comparators, the 5th electricity of the output terminal of the 5th shockproof circuit as the multistage temperature comparison circuit
Output terminal is pressed, the input terminal of the 6th shockproof circuit is connected with the output terminal of the 6th comparator, the 6th shockproof circuit
Sixth voltage output end of the output terminal as the multistage temperature comparison circuit.
7. protection circuit as claimed in claim 6, it is characterised in that the 4th shockproof circuit, the 5th shockproof circuit
And the 6th shockproof circuit is Schmitt trigger or hysteresis comparator.
8. as claim 5-7 any one of them protection circuit, it is characterised in that the control circuit include the first NOT gate,
Second NOT gate, the 3rd NOT gate, the one or three input with door, the two or three input with door, the three or three input with door, the one or two input with
Door, the two or two input and door, the three or two input and door, four input nor gates, wherein：
The input terminal of first NOT gate is inputted respectively with the described 1st input with the first input end of door and the two or three and door
First input end connection, fourth voltage input end of its common port as the control circuit, the output of first NOT gate
End be connected with the first input end of door with the described 3rd 3 input, the input terminal of second NOT gate and the described 1st input and
Door the second input terminal connection, fiveth voltage input end of its common port as the control circuit, second NOT gate it is defeated
Outlet is connected with the described 2nd 3 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 3rd NOT gate is connected with the first input end of described four input nor gates, its common port is as the control electricity
6th voltage input end on road, the output terminal of the 3rd NOT gate respectively the 3rd input terminal with the described 1st input and door,
Two or three input is connected with the 3rd input terminal of door and the three or three input with the 3rd input terminal of door, the one or three input and door
Output terminal be connected with the described 1st 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 and the output terminal and described four input nor gates of door
Second input terminal connects, and the two or three input and the output terminal of door connect with the described 2nd 2 input and the first input end of door
Connect, the two or two input and the second voltage input terminal of the second input terminal of door as the control circuit, the described 2nd 2
Input and be connected with the output terminal of door with the 3rd input terminal of described four input nor gates, the three or three input and the output terminal of door
It is connected with the described 3rd 2 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 three or two input and the 4th input of the output terminal and described four input nor gates of door
End connection, described four input output terminal of the output terminal of nor gate as the control circuit.
A kind of 9. MPPT chips, it is characterised in that the protection electricity including such as claim 1-8 any one of them excess-current excess-temperature
Road.
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| 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 |
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| 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 |
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| CN107919654B CN107919654B (en) | 2019-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112615354A (en) * | 2020-12-17 | 2021-04-06 | 西安易朴通讯技术有限公司 | Overcurrent protection circuit, Buck circuit and control method |
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| CN102983562A (en) * | 2012-12-14 | 2013-03-20 | 上海诚佳电子科技有限公司 | Current-limiting protector for electrical fire prevention |
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| CN106300246A (en) * | 2016-09-30 | 2017-01-04 | 英特格灵芯片(天津)有限公司 | Overvoltage crowbar |
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| CN1191407A (en) * | 1997-02-04 | 1998-08-26 | 精工电子有限公司 | Charge and discharge control circuit |
| CN102983562A (en) * | 2012-12-14 | 2013-03-20 | 上海诚佳电子科技有限公司 | Current-limiting protector for electrical fire prevention |
| CN105826903A (en) * | 2016-04-19 | 2016-08-03 | 无锡中感微电子股份有限公司 | Temperature detection circuit, temperature protection circuit, temperature detection system and temperature protection system |
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| CN112615354A (en) * | 2020-12-17 | 2021-04-06 | 西安易朴通讯技术有限公司 | Overcurrent protection circuit, Buck circuit and control method |
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