CN212258410U - Anti-impact current protection circuit applied to photovoltaic energy storage system - Google Patents
Anti-impact current protection circuit applied to photovoltaic energy storage system Download PDFInfo
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- CN212258410U CN212258410U CN202021243819.8U CN202021243819U CN212258410U CN 212258410 U CN212258410 U CN 212258410U CN 202021243819 U CN202021243819 U CN 202021243819U CN 212258410 U CN212258410 U CN 212258410U
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Abstract
The utility model discloses a be applied to photovoltaic energy storage system's protecting circuit against shock current, including first relay, the second relay, the current-limiting unit, switch element and delay circuit, the first contact of first relay is connected with alternating current power supply's first port electricity, the first contact of second relay is connected with alternating current power supply's second port electricity, the second contact of first relay is connected with load circuit's first end electricity, it has the current-limiting unit to concatenate between the second contact of second relay and load circuit's the second end, the last parallelly connected switch element that has of current-limiting unit, delay circuit is connected to the switch element electricity. Through setting up current-limiting unit, switch element and delay circuit, the electric current flows through the current-limiting unit at first after the electricity, can restrain impulse current, and after the delay of a period of time again, the switch element switches on, with the short circuit of current-limiting unit, has guaranteed the work efficiency of circuit, and the complexity reduces, and the protecting against shock electric current is effectual, also can corresponding improvement circuit's life.
Description
Technical Field
The utility model relates to a photovoltaic energy storage system technical field, concretely relates to be applied to photovoltaic energy storage system's protecting circuit against shock current.
Background
In circuitries, a large current, that is, a rush current, is generally generated at the moment a load is energized. For inductive loads, such as motors, at the moment of start-up, the inrush current will typically be 5-7 times the rated current. For capacitive loads, the capacitor is short-circuited at the moment of power-on, and the impact current is also large. Inrush current can cause power quality problems that can cause damage to the load or other functional circuitry.
Most of the existing impact current protection circuits are complex in form and high in cost, and certain risks are brought to the anti-interference performance and the reliability of the circuit.
SUMMERY OF THE UTILITY MODEL
For solving the technical defect, the utility model discloses a technical scheme lie in, provide a be applied to photovoltaic energy storage system's protecting circuit against shock current, including first relay, second relay, current limiting unit, switch element and delay circuit, the first contact of first relay is connected with alternating current power supply's first end electricity, the first contact of second relay is connected with alternating current power supply's second end electricity, the second contact of first relay is connected with load circuit's first end electricity, has concatenated the current limiting unit between the second contact of second relay and the second end of load circuit, the last parallelly connected switch element that has of current limiting unit, delay circuit is connected to the switch element electricity.
Further, the current limiting unit is a winding resistor or an NTC thermistor, the switch unit is a third relay, a first contact of the third relay is electrically connected with a second contact of the second relay, a second contact of the third relay is electrically connected with a second end of the load circuit, and the third relay is electrically connected with the delay circuit.
Furthermore, the current limiting unit is a winding resistor or an NTC thermistor, the switch unit is an electronic switch, a first power end of the electronic switch is electrically connected with a second contact of the second relay, a second power end of the electronic switch is electrically connected with a second end of the load circuit, and a control end of the electronic switch is electrically connected with the delay circuit.
Further, the electronic switch comprises a first MOS transistor and a second MOS transistor, a gate of the first MOS transistor is electrically connected with a gate of the second MOS transistor, a source of the first MOS transistor is electrically connected with a source of the second MOS transistor, a drain of the first MOS transistor is electrically connected with a second contact of the second relay, a drain of the second MOS transistor is electrically connected with a second end of the load circuit, and a gate of the first MOS transistor is electrically connected with the delay circuit.
Further, the electronic switch comprises a triac.
Further, the delay circuit is one of a passive RC delay circuit, an active RC delay circuit, or a timer-based delay circuit.
Further, the active delay circuit comprises a direct current power supply, a third resistor, a fourth resistor, a capacitor and a triode, wherein the direct current power supply is sequentially connected with the third resistor and the capacitor in series to form a loop, a base of the triode is respectively electrically connected with a second end of the third resistor and a first end of the capacitor, an emitter of the triode is electrically connected with a second end of the capacitor, the fourth resistor is connected between the first end of the third resistor and a collector of the triode in series, and the collector of the triode is electrically connected with the switch unit.
Compared with the prior art the utility model discloses technical scheme's beneficial effect does:
1. the utility model provides a pair of be applied to photovoltaic energy storage system's protecting circuit against shock electric current, through setting up the current-limiting unit, switch element and delay circuit, the electric current flows through the current-limiting unit at first after going up, can restrain impulse current, after the delay of a period of time again, switch element switches on, with the short circuit of current-limiting unit, the work efficiency of circuit has been guaranteed, the complexity reduces, high reliability, it is effectual to prevent the impulse current, also can corresponding improvement circuit's life, action through first relay and second relay, the function that breaks away from of load and power can be realized to this circuit.
2. By adopting the NTC thermistor, the loss can be further reduced, the impact current can be more effectively inhibited, and the efficiency is improved to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an anti-impact current protection circuit applied to a photovoltaic energy storage system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an embodiment 1 of an anti-impact current protection circuit applied to a photovoltaic energy storage system according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an embodiment 2 of an anti-impact current protection circuit applied to a photovoltaic energy storage system according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an embodiment 3 of an anti-impact current protection circuit applied to a photovoltaic energy storage system according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a delay circuit according to an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Example 1
Please refer to fig. 1, the utility model provides a pair of be applied to photovoltaic energy storage system's protecting circuit against shock current, specifically be applied to photovoltaic energy storage off-grid system, be particularly useful for in the circuit that the load is capacitive or perceptual, including ac power supply, first relay K1, second relay K2, load circuit, the current limiting unit, switch element and delay circuit, first relay K1's first contact is connected with ac power supply's first port electricity, second relay K2's first contact is connected with ac power supply's second port electricity, first relay K1's second contact is connected with load circuit's first end electricity, the current limiting unit has been concatenated between second relay K2's second contact and load circuit's the second end in series, the last switch element that has parallelly connected of current limiting unit, the delay circuit of switch element electricity connection.
Through setting up the current-limiting unit, switch element and delay circuit, the electric current flows through the current-limiting unit at first after the electricity, can restrain impulse current, after the delay of a period of time again, switch element switches on, with the short circuit of current-limiting unit, the work efficiency of circuit has been guaranteed, the complexity reduces, the cost also corresponding reduction, the reliability is high, the protecting against shock electric current is effectual, also can corresponding improvement circuit's life, action through first relay and second relay, the function that breaks away from of load and power can be realized to this circuit.
When the environmental temperature is too high or the power-on time interval is short, the current limiting unit is delayed by the delay circuit after being powered on, and the current limiting unit is short-circuited by arranging a mechanical contact, so that the impact current can be effectively inhibited, and meanwhile, the working efficiency of the circuit can be ensured, wherein as shown in fig. 2, the current limiting unit is a winding resistor R1, the switch unit is a third relay K3, a first contact of the third relay K3 is electrically connected with a second contact of a second relay K2, a second contact of the third relay K3 is electrically connected with a second end part of a load circuit, and a driving coil of the third relay K3 is connected with the delay circuit.
Specifically, the winding resistor R1 can be replaced by an NTC thermistor.
Example 2
As shown in fig. 3, the current limiting unit is a winding resistor R2, the switch unit is an electronic switch, a first power end of the electronic switch is electrically connected to the second contact of the second relay K2, a second power end of the electronic switch is electrically connected to the second end of the load circuit, and a control end of the electronic switch is electrically connected to the delay circuit.
The current limiting unit is short-circuited by arranging the electronic contact, so that the on-off of the mute current can be realized to inhibit the impact current, and the noise is avoided.
Specifically, the electronic switch includes two reverse series-connected power MOSFETs (Metal-Oxide-Semiconductor Field Effect transistors), that is, a gate of the first MOS Transistor is electrically connected to a gate of the second MOS Transistor, a source of the first MOS Transistor is electrically connected to a source of the second MOS Transistor, a drain of the first MOS Transistor is electrically connected to the second contact of the second relay K2, a drain of the second MOS Transistor is electrically connected to the second end of the load circuit, and a gate of the first MOS Transistor is electrically connected to the delay circuit.
Alternatively, the electronic switch comprises a triac.
Example 3
As shown in fig. 4, the current limiting unit is an NTC thermistor (Negative Temperature Coefficient), the switching unit is an electronic switch, a first power end of the electronic switch is electrically connected to the second contact of the second relay K2, a second power end of the electronic switch is electrically connected to the second end of the load circuit, and a control end of the electronic switch is electrically connected to the delay circuit.
Specifically, the electronic switch includes two reverse series-connected power MOSFETs (Metal-Oxide-Semiconductor Field Effect transistors), that is, a gate of the first MOS Transistor is electrically connected to a gate of the second MOS Transistor, a source of the first MOS Transistor is electrically connected to a source of the second MOS Transistor, a drain of the first MOS Transistor is electrically connected to the second contact of the second relay, a drain of the second MOS Transistor is electrically connected to the second end of the load circuit, and a gate of the first MOS Transistor is electrically connected to the delay circuit.
Alternatively, the electronic switch comprises a triac.
Preferably, the delay circuit is one of a passive RC delay circuit or an active RC delay circuit or a timer-based delay circuit. The passive RC delay circuit or the active RC delay circuit is adopted for scenes with short delay time and low requirement on precision, and the timer-based delay circuit is preferably selected for occasions requiring longer delay time and precision.
Specifically, as shown in fig. 5, the active delay circuit includes a dc power supply, a third resistor R3, a fourth resistor R4, a capacitor C1, and a transistor D1, the dc power supply is sequentially connected in series with the third resistor R3 and the capacitor C1 to form a loop, a base of the transistor D1 is electrically connected to a second end of the third resistor R3 and a first end of the capacitor C1, an emitter of the transistor D1 is electrically connected to a second end of the capacitor C1, a fourth resistor R4 is connected in series between the first end of the third resistor R3 and a collector of the transistor D1, and a collector of the transistor D1 is electrically connected to the switching unit.
In the actual use process, the anti-impact current protection circuit applied to the photovoltaic energy storage system is connected with the port of the photovoltaic energy storage off-grid system, the photovoltaic energy storage system is connected with an external power supply, and the current limiting unit works normally.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a be applied to photovoltaic energy storage system's protecting circuit against shock current which characterized in that: including first relay, second relay, current limiting unit, switch element and delay circuit, the first contact of first relay is connected with alternating current power supply's first port electricity, the first contact of second relay is connected with alternating current power supply's second tip electricity, the second contact of first relay is connected with load circuit's first tip electricity, has concatenated current limiting unit between the second contact of second relay and load circuit's the second tip, the last parallelly connected switch element that has of current limiting unit, delay circuit is connected to the switch element electricity.
2. The surge-resistant current protection circuit applied to the photovoltaic energy storage system according to claim 1, wherein: the current limiting unit is a winding resistor or an NTC thermistor, the switch unit is a third relay, a first contact of the third relay is electrically connected with a second contact of the second relay, the second contact of the third relay is electrically connected with the second end part of the load circuit, and the third relay is electrically connected with the delay circuit.
3. The surge-resistant current protection circuit applied to the photovoltaic energy storage system according to claim 1, wherein: the current limiting unit is a winding resistor or an NTC thermistor, the switch unit is an electronic switch, a first power end of the electronic switch is electrically connected with a second contact of the second relay, a second power end of the electronic switch is electrically connected with a second end part of the load circuit, and a control end of the electronic switch is electrically connected with the delay circuit.
4. The surge-resistant current protection circuit applied to the photovoltaic energy storage system according to claim 3, wherein: the electronic switch comprises a first MOS tube and a second MOS tube, the grid electrode of the first MOS tube is electrically connected with the grid electrode of the second MOS tube, the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube, the drain electrode of the first MOS tube is electrically connected with the second contact of the second relay, the drain electrode of the second MOS tube is electrically connected with the second end part of the load circuit, and the grid electrode of the first MOS tube is electrically connected with the delay circuit.
5. The surge-resistant current protection circuit applied to the photovoltaic energy storage system according to claim 3, wherein: the electronic switch comprises a triac.
6. An anti-surge current protection circuit applied to a photovoltaic energy storage system according to any one of claims 1 to 5, wherein: the delay circuit is one of a passive RC delay circuit, an active RC delay circuit or a delay circuit based on a timer.
7. The surge-resistant current protection circuit applied to the photovoltaic energy storage system according to claim 6, wherein: the active time delay circuit comprises a direct current power supply, a third resistor, a fourth resistor, a capacitor and a triode, wherein the direct current power supply is sequentially connected with the third resistor and the capacitor in series to form a loop, the base electrode of the triode is respectively electrically connected with the second end part of the third resistor and the first end part of the capacitor, the emitting electrode of the triode is electrically connected with the second end part of the capacitor, the fourth resistor is connected between the first end part of the third resistor and the collecting electrode of the triode in series, and the collecting electrode of the triode is electrically connected with the switch unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021243819.8U CN212258410U (en) | 2020-06-29 | 2020-06-29 | Anti-impact current protection circuit applied to photovoltaic energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021243819.8U CN212258410U (en) | 2020-06-29 | 2020-06-29 | Anti-impact current protection circuit applied to photovoltaic energy storage system |
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| CN212258410U true CN212258410U (en) | 2020-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
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2020
- 2020-06-29 CN CN202021243819.8U patent/CN212258410U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
| CN113937743B (en) * | 2021-10-18 | 2024-05-14 | 深圳英恒电子有限公司 | Impact current suppression circuit |
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