CN207283153U - Short-circuit protection circuit for inverter - Google Patents
Short-circuit protection circuit for inverter Download PDFInfo
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- CN207283153U CN207283153U CN201721445561.8U CN201721445561U CN207283153U CN 207283153 U CN207283153 U CN 207283153U CN 201721445561 U CN201721445561 U CN 201721445561U CN 207283153 U CN207283153 U CN 207283153U
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Abstract
The utility model provides the short-circuit protection circuit for inverter, belongs to inverter field, inverter, which includes controller, drive circuit, inverter circuit and LC filter circuits, short-circuit protection circuit, to be included：Voltage sampling circuit, current sampling circuit, the first comparison circuit, the second comparison circuit.The sampled voltage got is transmitted to by the first comparison circuit by voltage sampling circuit; and the sample rate current got is changed into after secondary voltage by current sampling circuit and is transmitted to the second comparison circuit; when the first comparison circuit judges that sampled voltage is less than predetermined voltage threshold and the second comparison circuit judgement secondary voltage more than default secondary voltage threshold value; so as to determine the rise of the output current moment of inverter, voltage decline abruptly; just realize the short-circuit protection to inverter, and then improve the reliability to the short-circuit protection of inverter.
Description
Technical field
The utility model belongs to inverter field, the more particularly to short-circuit protection circuit for inverter.
Background technology
Inverter is that the direct current of 12V or 24V is converted into the alternating current of 220V, 50Hz or changes other kinds of friendship
Galvanic electricity, the alternating current that it is exported can meet to provide AC power for all kinds of electrical equipments.The short-circuit protection electricity in inverter
Road is very important a link, it has been largely fixed the safety issue of inverter in actual use.
At present, short-circuit protection circuit uses current transformer sample rate current, and comparator is according to sample rate current and predetermined current
Whether threshold decision blocks the inverter bridge in inverter, but actually only one threshold value of increase is higher for such short-circuit protection
Overcurrent protection, can not receive good effect in most cases.Therefore, such short-circuit protection circuit reliability is not high.
Utility model content
In order to solve shortcoming and defect existing in the prior art, the utility model provide by the first comparison circuit and
First comparison circuit determines the output current moment rise of inverter, voltage decline abruptly, just realizes to inverter
Short-circuit protection, and then improve the short-circuit protection circuit for inverter of reliability.
In order to reach above-mentioned technical purpose, the utility model provides the short-circuit protection circuit for inverter, described
Inverter includes controller, the drive circuit for connecting controller, the inverter circuit for connecting drive circuit and connection inverter circuit
LC filter circuits, the short-circuit protection circuit includes：
Voltage sampling circuit for the output voltage for obtaining LC filter circuits；
For obtaining the output current of LC filter circuits, and convert thereof into the current sampling circuit of secondary voltage；
For obtaining the sampled voltage of voltage sampling circuit, by sampled voltage make comparisons with predetermined voltage threshold first ratio
Compared with circuit；
For obtaining the secondary voltage of current sampling circuit, determined according to the output state of the first comparison circuit default secondary
Voltage threshold, secondary voltage is made comparisons with default secondary voltage threshold value, if judging that sampling secondary voltage is more than presets secondary electricity
When pressing threshold value, then controller inputs the second comparison circuit of locking signal to drive circuit；
Collection terminal connection current sampling circuit, voltage sampling circuit and the second comparison circuit of controller, voltage sample electricity
The input terminal connection LC filter circuits on road, the output terminal of voltage sampling circuit connect the first comparison circuit, the first comparison circuit
Output terminal connects the second comparison circuit, the input terminal connection LC filter circuits of current sampling circuit, the output of current sampling circuit
The second comparison circuit of end connection.
Optionally, the voltage sampling circuit includes the first reduction voltage circuit, the first rectification circuit, the first filter circuit, the
Two reduction voltage circuits and the first sample circuit, the first reduction voltage circuit input terminal connection LC filter circuits, the first reduction voltage circuit it is defeated
Outlet connects the first rectification circuit, and the output terminal of the first rectification circuit connects the first filter circuit, the output of the first filter circuit
The second reduction voltage circuit of end connection, the output terminal of the second reduction voltage circuit connect the first sample circuit, the output terminal of the first sample circuit
Connect the first comparison circuit and controller.
Optionally, first reduction voltage circuit includes resistance R25 and resistance R26, one end and the LC filter circuits of resistance R25
The first output terminal be connected, the other end of resistance R25 is connected with the first input end of the first rectification circuit, one end of resistance R26
It is connected with the second output terminal of LC filter circuits, the other end of resistance R26 is connected with the second input terminal of the first rectification circuit.
Optionally, first sample circuit includes sampling resistor R16, and one end connection first of sampling resistor R16 is compared
Circuit and the second reduction voltage circuit, the other end connection controller of sampling resistor R16.
Optionally, the current sampling circuit includes current transformer, the second rectification circuit, conversion circuit, the second filtering
Circuit and the second sample circuit, the both ends connection LC filter circuits of the primary coil of current transformer, the secondary of current transformer
The both ends of coil connect the second rectification circuit, the output terminal connection conversion circuit of the second rectification circuit, the output terminal of conversion circuit
The second filter circuit is connected, the output terminal of the second filter circuit connects the second sample circuit, and the output terminal of the second sample circuit connects
Connect the second comparison circuit and controller.
Optionally, first comparison circuit includes first comparator, and first comparator has in-phase input end and anti-phase
Input terminal, the in-phase input end of first comparator are connected with one end of sampling resistor R16, and the reverse input end of first comparator connects
It is connected to the first bleeder circuit for setting predetermined voltage threshold.
Optionally, second comparison circuit includes the second comparator, and the second comparator has in-phase input end and anti-phase
Input terminal, is equipped with default secondary for that can set between the in-phase input end of first comparator and the output terminal of the second comparator
Second bleeder circuit of voltage threshold, the inverting input of the second comparator connect the second sample circuit.
Optionally, second bleeder circuit include resistance R13, the resistance R21 that connects with resistance R13 and with resistance R21
The resistance R22 of series connection.
The beneficial effect that technical solution provided by the utility model is brought is：Adopted by voltage sampling circuit by what is got
Sample voltage is transmitted to the first comparison circuit, and after the sample rate current got is changed into secondary voltage by current sampling circuit
The second comparison circuit is transmitted to, when the first comparison circuit judges that sampled voltage is less than predetermined voltage threshold and the second comparison circuit is sentenced
When determining secondary voltage more than default secondary voltage threshold value, so as to determine the output current moment rise of inverter, voltage wink
Between fall, just realize to the short-circuit protection of inverter, and then improve the reliability to the short-circuit protection of inverter.
Brief description of the drawings
, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution of the utility model
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structure diagram of the short-circuit protection circuit provided by the utility model for inverter；
Fig. 2 is the structure diagram of voltage sampling circuit provided by the utility model；
Fig. 3 is the structure diagram of current sampling circuit provided by the utility model；
Fig. 4 is the circuit diagram of the first comparison circuit provided by the utility model；
Fig. 5 is the circuit diagram of the second comparison circuit provided by the utility model.
Embodiment
To make the structure of the utility model and advantage clearer, the structure of the utility model is made below in conjunction with attached drawing
It is further described through.
Embodiment one
The utility model provides the short-circuit protection circuit for inverter, and the inverter includes controller, connects
Connect the drive circuit of controller, the inverter circuit of connection drive circuit and the LC filter circuits for connecting inverter circuit, the short circuit
Protection circuit includes：
Voltage sampling circuit for the output voltage for obtaining LC filter circuits；
For obtaining the output current of LC filter circuits, and convert thereof into the current sampling circuit of secondary voltage；
For obtaining the sampled voltage of voltage sampling circuit, by sampled voltage make comparisons with predetermined voltage threshold first ratio
Compared with circuit；
For obtaining the secondary voltage of current sampling circuit, determined according to the output state of the first comparison circuit default secondary
Voltage threshold, secondary voltage is made comparisons with default secondary voltage threshold value, if judging that sampling secondary voltage is more than presets secondary electricity
When pressing threshold value, then controller is controlled to the second comparison circuit of drive circuit input locking signal；
Collection terminal connection current sampling circuit, voltage sampling circuit and the second comparison circuit of controller, voltage sample electricity
The input terminal connection LC filter circuits on road, the output terminal of voltage sampling circuit connect the first comparison circuit, the first comparison circuit
Output terminal connects the second comparison circuit, the input terminal connection LC filter circuits of current sampling circuit, the output of current sampling circuit
The second comparison circuit of end connection.
In force, as shown in Figure 1, inverter includes controller 1, drive circuit 2, inverter circuit 3 and LC filtered electricals
Road 4, short-circuit protection circuit include voltage sampling circuit 5, current sampling circuit 6, the first comparison circuit 7 and the second comparison circuit 8.
The control terminal connection drive circuit 2 of controller 1, collection terminal connection voltage sampling circuit 5,6 and of current sampling circuit of controller 1
Second comparison circuit 8, the output terminal connection inverter circuit 3 of drive circuit 2, the output terminal connection LC filter circuits of inverter circuit 3
The output terminal connection voltage sampling circuit 5 and current sampling circuit 6 of 4, LC filter circuit 4, the output terminal of voltage sampling circuit 5
The first comparison circuit 7 is connected, the output terminal of the first comparison circuit 7 connects the second comparison circuit 8, the output of current sampling circuit 6
The second comparison circuit 8 of end connection.
When inverter occurs overloading or during output short-circuit, the electric current moment that the LC filter circuits 4 in inverter export
Rise, voltage decline abruptly, the first comparison circuit 7, the first ratio are transmitted to by voltage sampling circuit 5 by the sampled voltage of acquisition
Sampled voltage and predetermined voltage threshold are compared compared with circuit 7；The sample rate current of acquisition is changed two by current sampling circuit 6
The second comparison circuit 8 is transmitted to after secondary voltage, the second comparison circuit 8 makes comparisons secondary voltage with default secondary voltage threshold value；
When the first comparison circuit 7 determines sampled voltage, less than predetermined voltage threshold and the second comparison circuit 8 to determine secondary voltage big
When default secondary voltage threshold value, then the second comparison circuit 8 control controller 1 inputs locking signal to drive circuit 2 immediately, makes
The output current for obtaining the LC filter circuits 4 in inverter is reduced or switched off, after the output current of LC filter circuits 4 reduces,
Controller 1 stops inputting locking signal to drive circuit 2, and inverter recovers normal power supply.Therefore, short-circuit protection circuit according to
Detect the rise of output current moment, the voltage decline abruptly of the LC filter circuits 4 in inverter, just realize to inverter
Short-circuit protection, and then improve reliability of the short-circuit protection circuit to the short-circuit protection of inverter.
Optionally, the voltage sampling circuit includes the first reduction voltage circuit, the first rectification circuit, the first filter circuit, the
Two reduction voltage circuits and the first sample circuit, the first reduction voltage circuit input terminal connection LC filter circuits, the first reduction voltage circuit it is defeated
Outlet connects the first rectification circuit, and the output terminal of the first rectification circuit connects the first filter circuit, the output of the first filter circuit
The second reduction voltage circuit of end connection, the output terminal of the second reduction voltage circuit connect the first sample circuit, the output terminal of the first sample circuit
Connect the first comparison circuit and controller.
In force, as described above, as shown in Fig. 2, voltage sampling circuit 5 includes the first reduction voltage circuit 51, first
Rectification circuit 52, the first filter circuit 53, the second reduction voltage circuit 54 and the first sample circuit 55, due in voltage sampling circuit 5
Each element is to the difference of different size current carrying capacity, thus voltage sampling circuit 5 is successively depressured twice, is prevented
Subelement is burnt out because the output AC voltage of LC filter circuits 4 is excessive.The alternating voltage that LC filter circuits 4 export is first through the
One reduction voltage circuit 51 is once depressured it, the alternating voltage after being depressured, and is secondly changed into directly through the second rectification circuit 52
Galvanic electricity pressure, again through 53 filtering clutter of the first filter circuit, obtains ideal voltage, then through the second reduction voltage circuit 54 to compared with
Secondary decompression is carried out for preferable voltage, last first sample circuit 55 samples the voltage after secondary decompression, adopted
Sample voltage, transmits it to the first comparison circuit 7 and controller 1, and the first comparison circuit 7 opposes sampled voltage and predeterminated voltage
Than according to comparing result and then determining the output state of itself.
Optionally, first reduction voltage circuit includes resistance R25 and resistance R26, one end and the LC filter circuits of resistance R25
The first output terminal be connected, the other end of resistance R25 is connected with the first input end of the first rectification circuit, one end of resistance R26
It is connected with the second output terminal of LC filter circuits, the other end of resistance R26 is connected with the second input terminal of the first rectification circuit.
In force, the first reduction voltage circuit 51 can have many implementations, in order to realize decompression work(with least cost
Can, the first reduction voltage circuit 51 here includes resistance R25 and resistance R26, one end of resistance R25 and the first of LC filter circuits 4
Output terminal is connected, and the other end of resistance R25 is connected with the first input end of the first rectification circuit 52, one end of resistance R26 and LC
Second output terminal of filter circuit 4 is connected, and the other end of resistance R26 is connected with the second input terminal of the first rectification circuit 52.
Optionally, first sample circuit includes sampling resistor R16, and one end connection first of sampling resistor R16 is compared
Circuit and the second reduction voltage circuit, the other end connection controller of sampling resistor R16.
In force, typically, the first sample circuit 55 can equally have many implementations, in order to can be with least cost
Realize sampling functions, the first sample circuit 55 here is sampling resistor R16, and one end connection first of sampling resistor R16 is compared
7 and second reduction voltage circuit 54 of circuit, the other end connection controller 1 of sampling resistor R16.
Optionally, the current sampling circuit includes current transformer, the second rectification circuit, conversion circuit, the second filtering
Circuit and the second sample circuit, the both ends connection LC filter circuits of the primary coil of current transformer, the secondary of current transformer
The both ends of coil connect the second rectification circuit, the output terminal connection conversion circuit of the second rectification circuit, the output terminal of conversion circuit
The second filter circuit is connected, the output terminal of the second filter circuit connects the second sample circuit, and the output terminal of the second sample circuit connects
Connect the second comparison circuit and controller.
In force, as shown in figure 3, in order to obtain the alternating current of the output of LC filter circuits 4, it is mutual that electric current is usually used
Sensor 61 gathers it, and the alternating current collected is first converted into direct current by current transformer 61 through the second rectification circuit 62
Stream, next converted circuit 63 are converted into DC voltage, again through 64 filtering clutter of the second filter circuit, obtain ideal
Secondary voltage, most collects ideal secondary voltage through the second sample circuit 65 afterwards, and it is electric to transmit it to the second comparison
Secondary voltage is made comparisons, is passed through according to comparative result by road 8 and controller 1, the second comparison circuit 8 with default secondary voltage threshold value
Control controller 1 carrys out the output state of inverter.In addition, conversion circuit 63 here includes being resistance R27.
Optionally, first comparison circuit includes first comparator, and first comparator has in-phase input end and anti-phase
Input terminal, the in-phase input end of first comparator are connected with one end of sampling resistor R16, and the reverse input end of first comparator connects
It is connected to the first bleeder circuit for setting predetermined voltage threshold.
In force, the first comparison circuit 7 includes first comparator and the first bleeder circuit, and the first bleeder circuit can also
There are many implementations, the first bleeder circuit here includes resistance R14 and the resistance R23 to connect with resistance R14, predeterminated voltage
The size of threshold value is set by the intrinsic standoff ratio of resistance R14 and resistance R23.As shown in figure 4, the in-phase input end of first comparator U1
It is connected through resistance R15 with one end of sampling resistor R16, the in-phase input end of first comparator U1 is grounded through capacitance C5, the first ratio
Reverse input end compared with device U1 is grounded through capacitance C8, in the both ends parallel resistance R23 of capacitance C8, resistance R23 series resistance R14,
A termination power end Vcc (+5V) of resistance R14, the other end of resistance R14 are grounded through resistance R23, the output of first comparator U1
The second comparison circuit 8 of end connection.
When inverter is in normal condition, first comparator U1 is more than predetermined voltage threshold according to sample voltage value,
Then first comparator U1 inputs high-impedance state by output terminal to the second comparison circuit 8；
When inverter occurs overloading or is short-circuit, the voltage decline abruptly of the output of LC filter circuits 4 in inverter,
Electric current moment raises, then first comparator U1 is less than predetermined voltage threshold according to sample voltage value, then first comparator U1's is defeated
Outlet output is the output head grounding of low level, i.e. first comparator U1.
Optionally, second comparison circuit includes the second comparator, and the second comparator has in-phase input end and anti-phase
Input terminal, is equipped with default secondary for that can set between the in-phase input end of first comparator and the output terminal of the second comparator
Second bleeder circuit of voltage threshold, the inverting input of the second comparator connect the second sample circuit；
Wherein, second bleeder circuit includes resistance R13, the resistance R21 to connect with resistance R13 and is gone here and there with resistance R21
The resistance R22 of connection.
In force, the second comparison circuit 8 includes the second comparator and the second bleeder circuit, the second bleeder circuit here
Including resistance R13, resistance R21 and resistance R22.As shown in figure 5, the in-phase input end of the second comparator U2 is through resistance R22 connections
The output terminal of first comparator U1, the in-phase input end of the second comparator U2 connect power end Vcc (+5V), the second ratio through resistance R13
In-phase input end compared with device U2 is grounded through resistance R21, and C6 is connected in parallel with a capacitor at the both ends of resistance R21, the second comparator U2's
Inverting input meets power end Vcc (+5V) through diode D4, and the inverting input of the second comparator U2 is through diode D4 connections electricity
R13 is hindered, the inverting input of the second comparator U2 is grounded through capacitance C10, and the inverting input of the second comparator U2 is through resistance R19
Connect the second sample circuit 65, the output terminal connection controller 1 of the second sample circuit 65, second the second comparator of sample circuit U2
1 foot meet power end Vcc (+5V), the 1 foot meridian capacitor C7 ground connection of the second comparator U2, the 2 feet ground connection of the second comparator U2, the
The output terminal of 2 foot meridian capacitor C12 the second comparators of connection U2 of two comparator U2, the output terminal of the second comparator U2 is through resistance
R18 connects power end Vcc (+5V), the output terminal connection controller 1 of the second comparator U2.In addition, the second sample circuit 65 here
Identical implementation is taken with the first sample circuit 55, the second sample circuit 65 is resistance R20.
As described above, when inverter is in normal condition, then the output terminal output of first comparator U1 is height
Resistance state so that open-circuit condition is between the in-phase input end of the second comparator U2 and the output terminal of first comparator U1, thus
The size of default secondary voltage threshold value on the in-phase input end of second comparator U2 is the partial pressure by resistance R13 and resistance R21
Than what is determined, when the secondary voltage value on the reverse input end of the second comparator U2 is less than default secondary voltage threshold value, the first ratio
Compared with device U1 to 1 input high level of controller, controller 1 detects high level, and controller 1 just inputs driving letter to drive circuit 2
Number, the output current of LC filter circuits 4 is normal.
When inverter occurs overloading or is short-circuit, the voltage decline abruptly of the output of LC filter circuits 4 in inverter,
Electric current moment raises, then the output terminal drop-down ground connection of first comparator U1, secondary on the reverse input end of the second comparator U2
Voltage is more than default secondary voltage threshold value, the output state flip of the second comparator U2, controller 1 detect low level immediately to
Drive circuit 2 inputs locking signal so that the output current of LC filter circuits 4 is reduced or switched off, and then protects inverter.
In addition, inverter is in default two on the in-phase input end of overload or the second comparator U2 under short-circuit condition
The size of secondary voltage threshold is determined by the intrinsic standoff ratio of resistance R13, resistance R21 and resistance R22, at this moment presets secondary voltage threshold
Value is less than the default secondary voltage threshold value that inverter is under normal condition.
The utility model provides the short-circuit protection circuit for inverter, and inverter includes controller, driving electricity
Road, inverter circuit and LC filter circuits, short-circuit protection circuit include：Voltage sampling circuit, current sampling circuit, the first comparison are electric
Road, the second comparison circuit.The sampled voltage got is transmitted to by the first comparison circuit by voltage sampling circuit, and is passed through
The sample rate current got is changed into after secondary voltage and is transmitted to the second comparison circuit by current sampling circuit, when the first comparison circuit
When judging that sampled voltage is less than predetermined voltage threshold and the second comparison circuit judgement secondary voltage more than default secondary voltage threshold value,
So as to determine the rise of the output current moment of inverter, voltage decline abruptly, the short-circuit protection to inverter is just realized,
And then improve the reliability to the short-circuit protection of inverter.
Each sequence number in above-described embodiment is for illustration only, does not represent the elder generation during the assembling or use of each component
Order afterwards.
It these are only the embodiment of the utility model, be not intended to limit the utility model, all essences in the utility model
God and principle within, any modification, equivalent replacement, improvement and so on, should be included in the scope of protection of the utility model it
It is interior.
Claims (8)
1. for inverter short-circuit protection circuit, the inverter include controller, connect controller drive circuit,
Connect the inverter circuit of drive circuit and the LC filter circuits of connection inverter circuit, it is characterised in that the short-circuit protection circuit
Including：
Voltage sampling circuit for the output voltage for obtaining LC filter circuits；
For obtaining the output current of LC filter circuits, and convert thereof into the current sampling circuit of secondary voltage；
For obtaining the sampled voltage of voltage sampling circuit, the first comparison that sampled voltage is made comparisons with predetermined voltage threshold is electric
Road；
For obtaining the secondary voltage of current sampling circuit, default secondary voltage is determined according to the output state of the first comparison circuit
Threshold value, secondary voltage is made comparisons with default secondary voltage threshold value, if judging, sampling secondary voltage is more than default secondary voltage threshold
During value, then controller inputs the second comparison circuit of locking signal to drive circuit；
Collection terminal connection current sampling circuit, voltage sampling circuit and the second comparison circuit of controller, voltage sampling circuit
Input terminal connects LC filter circuits, and the output terminal of voltage sampling circuit connects the first comparison circuit, the output of the first comparison circuit
The second comparison circuit of end connection, the input terminal connection LC filter circuits of current sampling circuit, the output terminal of current sampling circuit connect
Connect the second comparison circuit.
2. the short-circuit protection circuit according to claim 1 for inverter, it is characterised in that the voltage sampling circuit bag
Include the first reduction voltage circuit, the first rectification circuit, the first filter circuit, the second reduction voltage circuit and the first sample circuit, the first decompression
The input terminal connection LC filter circuits of circuit, the output terminal of the first reduction voltage circuit connect the first rectification circuit, the first rectification circuit
Output terminal connect the first filter circuit, the output terminal of the first filter circuit connects the second reduction voltage circuit, the second reduction voltage circuit
Output terminal connects the first sample circuit, and the output terminal of the first sample circuit connects the first comparison circuit and controller.
3. the short-circuit protection circuit according to claim 2 for inverter, it is characterised in that the first reduction voltage circuit bag
Resistance R25 and resistance R26 are included, one end of resistance R25 is connected with the first output terminal of LC filter circuits, the other end of resistance R25
It is connected with the first input end of the first rectification circuit, one end of resistance R26 is connected with the second output terminal of LC filter circuits, resistance
The other end of R26 is connected with the second input terminal of the first rectification circuit.
4. the short-circuit protection circuit according to claim 2 for inverter, it is characterised in that the first sample circuit bag
Sampling resistor R16 is included, one end of sampling resistor R16 connects the first comparison circuit and the second reduction voltage circuit, and sampling resistor R16's is another
One end connects controller.
5. the short-circuit protection circuit according to claim 1 for inverter, it is characterised in that the current sampling circuit bag
Include current transformer, the second rectification circuit, conversion circuit, the second filter circuit and the second sample circuit, current transformer just
The both ends connection LC filter circuits of level coil, the both ends of the secondary coil of current transformer connect the second rectification circuit, and second is whole
The output terminal connection conversion circuit of current circuit, the output terminal of conversion circuit connect the second filter circuit, the second filter circuit it is defeated
Outlet connects the second sample circuit, and the output terminal of the second sample circuit connects the second comparison circuit and controller.
6. the short-circuit protection circuit according to claim 1 for inverter, it is characterised in that the first comparison circuit bag
First comparator is included, first comparator has in-phase input end and inverting input, and the in-phase input end of first comparator is with adopting
One end of sample resistance R16 is connected, and the reverse input end of first comparator is connected with first point for setting predetermined voltage threshold
Volt circuit.
7. the short-circuit protection circuit according to claim 1 for inverter, it is characterised in that the second comparison circuit bag
Include the second comparator, the second comparator has in-phase input end and inverting input, first comparator in-phase input end and
The second bleeder circuit that being used for, default secondary voltage threshold value can be set, the second comparator are equipped between the output terminal of second comparator
Inverting input connect the second sample circuit.
8. the short-circuit protection circuit according to claim 7 for inverter, it is characterised in that the second bleeder circuit bag
Include resistance R13, the resistance R21 to connect with resistance R13 and the resistance R22 to connect with resistance R21.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721445561.8U CN207283153U (en) | 2017-11-02 | 2017-11-02 | Short-circuit protection circuit for inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721445561.8U CN207283153U (en) | 2017-11-02 | 2017-11-02 | Short-circuit protection circuit for inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207283153U true CN207283153U (en) | 2018-04-27 |
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ID=61978739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721445561.8U Active CN207283153U (en) | 2017-11-02 | 2017-11-02 | Short-circuit protection circuit for inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN207283153U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038505A (en) * | 2018-07-16 | 2018-12-18 | 四川创宏电气有限公司 | A kind of power source short-circuit protection method and inverter |
-
2017
- 2017-11-02 CN CN201721445561.8U patent/CN207283153U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038505A (en) * | 2018-07-16 | 2018-12-18 | 四川创宏电气有限公司 | A kind of power source short-circuit protection method and inverter |
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