CN202978236U - Current limiting protection circuit of AC current of photovoltaic inverter - Google Patents
Current limiting protection circuit of AC current of photovoltaic inverter Download PDFInfo
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- CN202978236U CN202978236U CN 201220595452 CN201220595452U CN202978236U CN 202978236 U CN202978236 U CN 202978236U CN 201220595452 CN201220595452 CN 201220595452 CN 201220595452 U CN201220595452 U CN 201220595452U CN 202978236 U CN202978236 U CN 202978236U
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Abstract
The present utility model relates to a current limiting protection circuit of AC current of a photovoltaic inverter. The circuit comprises a current hall sensor, a current sampling coupling resistor unit, a voltage lifting coupling resistor unit, a first grade operation amplifier unit, a comparator unit and an NAND gate circuit, an output end of the current hall sensor is connected with the current sampling coupling resistor unit, current signals are converted into voltage signals through the current sampling coupling resistor unit, the current sampling coupling resistor unit is connected with the first grade operation amplifier unit, an output end of the first grade operation amplifier unit is connected with the voltage lifting coupling resistor unit, one end of the voltage lifting coupling resistor unit is connected with a comparing end of the comparator unit, the other end of the voltage lifting coupling resistor unit is connected with a 5V power supply, and an output end of the comparator unit is connected with the NAND gate circuit. The circuit is simple and low in costs, and an IGBT can be timely protected when the current is too large.
Description
Technical field
The utility model relates to a kind of current-limiting protection circuit, is specifically related to a kind of current-limiting protection circuit of alternating current of photovoltaic DC-to-AC converter.
Background technology
Along with the development of power electronic technology, in photovoltaic DC-to-AC converter, wind electric converter device systems, IGBT has become important, crucial element.In case IGBT breaks down, will have a strong impact on the maintenance of equipment, and cause damage.So when electric current moment is excessive, should take certain safeguard measure to guarantee the safety of IGBT and system equipment.
The utility model content
Based on above weak point, the utility model discloses a kind of current-limiting protection circuit of alternating current of photovoltaic DC-to-AC converter, can be to operating photovoltaic DC-to-AC converter overcurrent transient protection.
the utility model is achieved in that a kind of current-limiting protection circuit of alternating current of photovoltaic DC-to-AC converter, comprise the current Hall transducer, current sample build-out resistor unit, voltage lifting build-out resistor unit, one-level amplifier unit, comparator unit and NAND gate circuit, the current Hall transducer gathers ac current signal, the output connection current sample build-out resistor unit of current Hall transducer, current signal is voltage signal through current sample build-out resistor cell translation, current sample build-out resistor unit is connected with one-level amplifier unit, voltage signal after conversion follows through one-level amplifier unit and is converted to-voltage signal of 3V-3V, the output of one-level amplifier unit and voltage promote the build-out resistor unit and are connected, one end of voltage lifting build-out resistor unit is connected with the relatively end of comparator unit, an other end of voltage lifting build-out resistor unit is connected with the 5V power supply, the voltage signal of-3V-3V is after voltage promotes build-out resistor unit and 5V power supply formation matching voltage, process comparator unit and positive current overcurrent and negative current overcurrent compare again, the output of comparator unit is connected with NAND gate circuit, the driving signal that final outputs level signals and DSP send through NAND gate circuit with non-after export effective driving signal of the switch of control IGBT.
The utility model also has following feature:
1, described one-level amplifier unit comprises the TL072IDR chip.
2, described comparator unit comprises the LM193 chip.
3, described NAND gate circuit comprises the 74HC00D chip.
4, described current Hall transducer is LEM LF-1005-S.
The utlity model has circuit simple, advantage with low cost can be in time to protect IGBT when electric current is excessive.
Description of drawings
Fig. 1 is current sample partial circuit figure;
Fig. 2 is current-limiting protection partial circuit figure;
Fig. 3 is the utility model circuit structure block diagram; Wherein 1, the current Hall transducer, the 2, first build-out resistor unit, 3, one-level amplifier unit, 4, voltage promotes the build-out resistor unit, 5, comparator unit, 6, NAND gate circuit.
Embodiment
Further illustrate for example with reference to the accompanying drawings:
As shown in Fig. 1-2, the purpose of this utility model is by gathering alternating current, comes and the reference point of comparator compares, in case alternating current moment surpasses set limit value, the output of blocking immediately pwm signal.This circuit comprises current Hall transducer LEM LF-1005-S, build-out resistor R1, resistance R 2, resistance R 3, one-level amplifier TL072IDR, comparator LM193, NAND gate 74HC00D and other resistance and auxiliary capacitor, wherein, current signal after collection is connected with 3 pin of amplifier TL072IDR through build-out resistor R1, resistance R 2 with after resistance R is connected through transducer, output 1 pin of one-level amplifier TL072IDR again through voltage promote build-out resistor R5, resistance R 6 is connected with the 5V power supply with 2 pin of comparator LM193 with are connected pin and are connected, this point is defined as the A point.5V and reference value voltage matches resistance R 7, resistance R 8, the positive overcurrent reference voltage B that resistance R 9 generates, be connected with negative voltage reference value C with 3 pin of comparator with are connected pin and are connected, the output of comparator LM193 (A point and B, C exports more afterwards) be connected with 1 pin of NAND gate 74HC00D, the driving IGBT that DSP sends drives signal and is connected with 2 pin of NAND gate 74HC00D.The 3 pin final output signal of NAND gate 74HC00D are controlled the IGBT driver output and are effectively driven signal, control turning on and off of IGBT.This circuit theory: gather ac current signal by the current Hall transducer and be converted to voltage signal through build-out resistor, the voltage signal of following generation-3V-3V through one-level amplifier TL072IDR, this signal through build-out resistor R5, resistance R 6 and 5V power generation promote 5 volts again divided by 2 C point voltage, resistance R 4 and resistance R 5 be identical be all the resistance of 1K.Resistance R 7, resistance R 8, resistance R 9 and 5V power supply are for the reference voltage level of B point positive current overcurrent reference voltage and C point negative current overcurrent is provided.The A point compares with B point and C point after the LM193 comparator, in case C point voltage value greater than the A point or will produce the low level signal of overcurrent less than B point voltage value, this level signal is through participating in the control of the pwm signal that DSP sends with non-device 74HC00D.The timely temporary transient effective driving signal that blocks PWM, normal output drive signal after electric current is normal.The utility model is according to the difference of current sensor, and build-out resistor is not identical yet.In case have the overcurrent event to occur, this circuit will in time block IGBT, after electric current recovers normal range (NR), IGBT in time opens.
Claims (5)
1. the current-limiting protection circuit of the alternating current of a photovoltaic DC-to-AC converter, comprise the current Hall transducer, current sample build-out resistor unit, voltage lifting build-out resistor unit, one-level amplifier unit, comparator unit and NAND gate circuit, it is characterized in that: the current Hall transducer gathers ac current signal, the output connection current sample build-out resistor unit of current Hall transducer, current signal is voltage signal through current sample build-out resistor cell translation, current sample build-out resistor unit is connected with one-level amplifier unit, voltage signal after conversion follows through one-level amplifier unit and is converted to-voltage signal of 3V-3V, the output of one-level amplifier unit and voltage promote the build-out resistor unit and are connected, one end of voltage lifting build-out resistor unit is connected with the relatively end of comparator unit, an other end of voltage lifting build-out resistor unit is connected with the 5V power supply, the voltage signal of-3V-3V is after voltage promotes build-out resistor unit and 5V power supply formation matching voltage, process comparator unit and positive current overcurrent and negative current overcurrent compare again, the output of comparator unit is connected with NAND gate circuit, the driving signal that final outputs level signals and DSP send through NAND gate circuit with non-after export effective driving signal of the switch of control IGBT.
2. the current-limiting protection circuit of the alternating current of a kind of photovoltaic DC-to-AC converter according to claim 1 is characterized in that: described one-level amplifier unit comprises the TL072IDR chip.
3. the current-limiting protection circuit of the alternating current of a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described comparator unit comprises the LM193 chip.
4. the current-limiting protection circuit of the alternating current of a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described NAND gate circuit comprises the 74HC00D chip.
5. the current-limiting protection circuit of a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described current Hall transducer is LEM LF-1005-S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220595452 CN202978236U (en) | 2012-11-13 | 2012-11-13 | Current limiting protection circuit of AC current of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220595452 CN202978236U (en) | 2012-11-13 | 2012-11-13 | Current limiting protection circuit of AC current of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978236U true CN202978236U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220595452 Expired - Fee Related CN202978236U (en) | 2012-11-13 | 2012-11-13 | Current limiting protection circuit of AC current of photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978236U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300519A (en) * | 2014-10-17 | 2015-01-21 | 许继电气股份有限公司 | Method for restraining overlarge current during low-voltage ride-through of photovoltaic grid-connected inverter |
| CN114137452A (en) * | 2021-11-26 | 2022-03-04 | 南京新捷中旭微电子有限公司 | Hall integrated circuit with high stability |
-
2012
- 2012-11-13 CN CN 201220595452 patent/CN202978236U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300519A (en) * | 2014-10-17 | 2015-01-21 | 许继电气股份有限公司 | Method for restraining overlarge current during low-voltage ride-through of photovoltaic grid-connected inverter |
| CN104300519B (en) * | 2014-10-17 | 2018-01-23 | 国家电网公司 | Suppress electric current excessive method during a kind of photovoltaic combining inverter low voltage crossing |
| CN114137452A (en) * | 2021-11-26 | 2022-03-04 | 南京新捷中旭微电子有限公司 | Hall integrated circuit with high stability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20201113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |