Emergency stop circuit of photovoltaic combiner box

Abstract

The utility model relates to the related technical field of circuit design, in particular to a photovoltaic combiner box emergency stop circuit, which comprises an auxiliary power supply, a main circuit breaker, an external emergency stop interface and a relay K1, the auxiliary power supply is connected in series with the external emergency stop interface, the external emergency stop interface is electrically connected with the relay K1, and the relay K1 is electrically connected with the main circuit breaker. According to the sudden stop circuit of the photovoltaic combiner box, the external sudden stop circuit is additionally arranged, when abnormity occurs, an external sudden stop switch is switched off or a sudden stop line is burnt out by a fire, a winding of a relay K1 has no power, a relay is in a closed state, a shunt winding is electrified at the moment, a main circuit breaker is switched off, and a shunt switch-off circuit breaker cuts off photovoltaic output, so that equipment is completely powered off; and meanwhile, the added circuit is simple, and the reliability of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to circuit design, and in particular to an emergency stop circuit of a photovoltaic combiner box. Background Art

[0002] The combiner box is a wiring device that ensures the orderly connection and combiner function of photovoltaic modules in the photovoltaic power generation system. The device can ensure that the photovoltaic system is easy to cut off the circuit during maintenance and inspection, and reduce the scope of power outage when a photovoltaic system fails. The emergency stop circuit is a common safety device, which is used to quickly cut off the power supply in an emergency to protect the safety of personnel and equipment and minimize the damage caused by the accident. It is widely used in industrial control systems, mechanical equipment, automobiles and other fields. If the photovoltaic combiner box is equipped with an emergency stop circuit, the circuit safety of the photovoltaic combiner box can be protected to the greatest extent in an emergency. Therefore, there is a special need for an emergency stop circuit for the photovoltaic combiner box.

[0003] However, existing photovoltaic combiner boxes usually do not have an emergency stop function and are installed outdoors. When an emergency occurs in the energy storage device, the device cannot be completely powered off. Utility Model Content

[0004] The purpose of the utility model is to provide an emergency stop circuit for a photovoltaic combiner box to solve the problem that the existing photovoltaic combiner box mentioned in the above background technology usually does not have an emergency stop function and is installed outdoors. When an emergency occurs in the energy storage device, the device cannot be completely powered off.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a photovoltaic combiner box emergency stop circuit, which includes an auxiliary power supply, a main circuit breaker, an external emergency stop interface and a relay K1, wherein the auxiliary power supply is connected in series to the external emergency stop interface, the external emergency stop interface is electrically connected to the relay K1, and the relay K1 is electrically connected to the main circuit breaker.

[0006] Preferably, the auxiliary power supply is 24V taken from the bus after converging inside the photovoltaic combiner box.

[0007] Preferably, the auxiliary power supply supplies power to the external emergency stop switch through a diode.

[0008] Preferably, the main circuit breaker is a circuit breaker with a shunt function.

[0009] Preferably, the relay K1 winding controls the circuit flow of the main circuit breaker shunt winding, and the relay K1 winding is energized, the relay is disconnected, and the main circuit breaker shunt winding is de-energized.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the emergency stop circuit of the photovoltaic combiner box increases the external emergency stop circuit. When an abnormality occurs, the external emergency stop switch is disconnected or the emergency stop line is burned by fire, the relay K1 winding is without power and the relay is in a closed state. At this time, the shunt winding will be energized, the main circuit breaker will be disconnected, and the shunt disconnect circuit breaker will cut off the photovoltaic output, so that the equipment is completely powered off, which increases the safety of the system. At the same time, the increased circuit is simple, which increases the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the emergency stop circuit of the photovoltaic combiner box of the utility model. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] See also Figure 1 The utility model provides a technical solution: a photovoltaic combiner box emergency stop circuit, the emergency stop circuit includes an auxiliary power supply, a main circuit breaker, an external emergency stop interface and a relay K1, the auxiliary power supply is connected in series with the external emergency stop interface, the external emergency stop interface is electrically connected to the relay K1, and the relay K1 is electrically connected to the main circuit breaker. Through the setting of the auxiliary power supply, the main circuit breaker, the external emergency stop interface and the relay K1, firstly, a 24V auxiliary power supply is provided through the busbar refluxed inside the photovoltaic combiner box, and the external emergency stop interface is powered by the auxiliary power supply. At the same time, the external emergency stop interface can be installed on the box body of the photovoltaic combiner box or in the control room by connecting a button, which is convenient for operation, and then Under normal circumstances, the switch between E-PV1-24V+ and E-PV1 is closed, the relay K1 winding is energized, the relay is disconnected, the main circuit breaker shunt winding is de-energized, and the circuit breaker can be manually closed and disconnected normally. When an abnormality occurs, the external emergency stop switch is disconnected or the emergency stop line is burned out by fire, the relay K1 winding is de-energized, and the relay is in a closed state. At this time, the shunt winding will be energized to disconnect the main circuit breaker. After disconnection, the equipment is completely in a power-off state to ensure the safety of the system. The external emergency stop interface can also be manually controlled. When the button connected to the external emergency stop interface is pressed, the relay triggers the shunt circuit of the circuit breaker to disconnect the circuit breaker, making the operation more flexible.

[0014] Furthermore, the auxiliary power supply is 24V taken from the bus after the merging inside the photovoltaic combiner box. Through the setting of the auxiliary power supply, the auxiliary power supply can supply power to the external emergency stop switch through the diode without providing additional power supply.

[0015] Furthermore, the auxiliary power supply supplies power to the external emergency stop switch through a diode. Through the setting of the external emergency stop switch, when the external emergency stop is pressed, the relay triggers the shunt circuit of the circuit breaker to disconnect the circuit breaker, thereby disconnecting the power supply. When an emergency occurs and the external emergency stop switch is burned out by a fire, the main circuit breaker can also be disconnected to disconnect the power supply.

[0016] Furthermore, the main circuit breaker is a circuit breaker with a shunt function. Through the setting of the main circuit breaker, when the shunt winding of the main circuit breaker is without power, the circuit breaker can be manually closed and opened normally. When the shunt winding of the relay K1 is without power, the shunt winding is energized to actively disconnect the main circuit breaker.

[0017] Furthermore, the relay K1 winding controls the circuit flow of the main circuit breaker shunt winding, and the relay K1 winding is energized, the relay is disconnected, and the main circuit breaker shunt winding is de-energized. Through the setting of the relay, when the photovoltaic combiner box is in a normal state, the relay K1 winding is energized, the relay is disconnected, the main circuit breaker shunt winding is de-energized, and the circuit breaker can be manually closed and opened normally. When the photovoltaic combiner box is in an abnormal state, the external emergency stop switch is disconnected or the emergency stop line is burned by a fire, the relay K1 winding is de-energized, and the relay is in a closed state. At this time, the shunt winding will be energized to disconnect the main circuit breaker.

[0018] Working principle: The emergency stop circuit of the photovoltaic combiner box, when the circuit is flowing normally, the switch between E-PV1-24V+ and E-PV1 is closed, the relay K1 winding is energized, the relay is disconnected, and the main circuit breaker shunt winding is de-energized. At this time, the circuit breaker can be manually closed and disconnected normally. When an emergency power outage is required, the external emergency stop switch is powered by an auxiliary power supply. The external emergency stop switch can be powered off by active pressing and passive burning. When the external emergency stop switch is actively pressed, the relay K1 winding is de-energized and the relay is in a closed state. At this time, the circuit breaker shunt winding will be energized, disconnecting the main circuit breaker to completely cut off the power to the equipment.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic combiner box emergency stop circuit, characterized in that: The emergency stop circuit comprises an auxiliary power supply, a main circuit breaker, an external emergency stop interface and a relay K1, wherein the auxiliary power supply is connected in series to the external emergency stop interface, the external emergency stop interface is electrically connected to the relay K1, and the relay K1 is electrically connected to the main circuit breaker.

2. A photovoltaic combiner box emergency stop circuit according to claim 1, characterized in that: The auxiliary power supply is 24V taken from the bus after the merging inside the photovoltaic combiner box.

3. A photovoltaic combiner box emergency stop circuit according to claim 1, characterized in that: The auxiliary power supply supplies power to the external emergency stop switch through a diode.

4. A photovoltaic combiner box emergency stop circuit according to claim 1, characterized in that: The main circuit breaker is a circuit breaker with a shunt function.

5. A photovoltaic combiner box emergency stop circuit according to claim 1, characterized in that: The relay K1 winding controls the circuit flow of the main circuit breaker shunt winding, and the relay K1 winding is energized, the relay is disconnected, and the main circuit breaker shunt winding is de-energized.

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