KR20200000987A - Protecting circuit and a method for protecting of circuit using the same - Google Patents

Abstract

The present invention relates to a protecting circuit and a circuit protecting method using the same. The protecting circuit integrates a switch which blocks abnormal voltage by being opened based on overvoltage and overtemperature, and a fuse which blocks abnormal current by being melted and cut based on overcurrent as one element so as to reduce consumption for costs and spaces due to the switch and fuse facilities in the circuit and effectively protect the circuit from the overvoltage, the overtemperature, and the overcurrent.

Description

Protecting circuit and a method for protecting of circuit using the same}

The present invention relates to a protection circuit and a circuit protection method using the same. More particularly, the present invention relates to a switch for blocking an abnormal voltage by opening based on an overvoltage and an overtemperature, and a fuse for blocking an abnormal current by fusion based on an overcurrent. By integrating into one device, the present invention relates to a protection circuit and a circuit protection method using the same, which can reduce the cost and space consumption due to the switch and fuse installation in the circuit, and effectively protect the circuit from overvoltage, over temperature and over current.

In recent years, the use of secondary batteries such as medium and large battery packs used in electric vehicles or hybrid vehicles, as well as mobile devices such as mobile phones and laptops, is increasing rapidly.

The secondary battery generally includes a safety device for preventing an accident such as fire / explosion due to a short circuit in the process of being connected to an external device such as an electronic device or a charger.

Conventionally, as one of such safety devices, a current fuse is mainly used as an element for protecting a circuit from an overcurrent caused by a short circuit.

Such current fuses have the advantage of being melted within a predetermined time when the overcurrent occurs due to a short circuit to protect the circuit from the overcurrent, but there is a limitation in that the current fuse has no operability against problems such as overvoltage and abnormal temperature change in the circuit.

On the other hand, in order to overcome these limitations and solve the above-mentioned problems, a conventional sensing circuit for detecting overvoltage, overcurrent, and overtemperature, and a pyro switch which is opened based on a sensing result of the sensing circuit, are added to the overvoltage, In the case of overcurrent and overtemperature, the Pyro switch is protected by opening the Pyro switch. However, in this case, the Pyro switch blocks the overvoltage, overcurrent and overtemperature having different values using only one Pyro switch. In the event of a switch failure, there was a problem that the circuit could not be protected.

In addition, in order to overcome such a problem, when adding a circuit protection element such as a fuse other than a pyro switch, there is a problem that not only the design of the circuit is complicated, but also the cost of the circuit design can be unnecessarily increased.

Republic of Korea Patent Publication No. 10-2014-0097803

SUMMARY OF THE INVENTION An object of the present invention is to provide a protection circuit capable of efficiently protecting a circuit from overvoltage, overtemperature, and overcurrent by using a switch for blocking overvoltage and overtemperature, and a fuse for blocking overcurrent, and a circuit protection method using the same. will be.

In addition, by integrating a switch that cuts off the abnormal voltage by opening based on overvoltage and overtemperature, and a fuse that cuts off the abnormal current by melting based on the overcurrent into a single device, the cost and space of the switch and fuse installation in the circuit The present invention provides a protection circuit capable of reducing consumption and a circuit protection method using the same.

In addition, when any one or more of overvoltage, overtemperature, and overcurrent is detected, first, by opening the switch to cut off the voltage or current, in the event of a switch failure, the overvoltage and overvoltage detected through the opening of the relay element or the fuse of the fuse The present invention provides a protection circuit and a circuit protection method using the same by blocking any one or more of the temperature and the overcurrent, thereby protecting the circuit from overvoltage, overtemperature, and overcurrent even when a switch fails.

A protection circuit according to an embodiment of the present invention, a protection element including a switch that is opened and closed based on any one or more of overvoltage, overcurrent and overtemperature, and a fuse melted based on an overcurrent applied when the switch is opened. It may include a detection unit for detecting any one or more of the over-voltage, over-current and over-temperature, and a controller for opening the switch when any one or more of the over-voltage, over-current and over-temperature is detected.

In an embodiment, the protection element may further include a relay element connected to the switch and opened / closed by the control unit. The control unit may include the switch when one or more of an overvoltage and an overtemperature are detected. While opening the switch, if the opening of the switch is not possible, may further include opening the relay element.

In an embodiment, the controller may open the switch when an overcurrent is detected, but melt the fuse when the switch cannot be opened.

In one embodiment, when the opening of the switch is impossible, the controller may melt the fuse within a predetermined time.

In one embodiment, the detector may be connected to the outside of the protection circuit.

On the other hand, the circuit protection method using a protection circuit according to an embodiment of the present invention, the step of detecting any one or more of overvoltage, overcurrent and overtemperature, if any one or more of overvoltage, overcurrent and overtemperature is detected, the The method may include opening a switch included in the protection element, and melting the fuse included in the protection element based on the opening of the switch by a current.

In one embodiment, the protection element may further include a relay element connected to the switch, the circuit protection method using the protection circuit, when any one or more of overvoltage and overtemperature is detected, the switch When opening, but the opening of the switch is impossible, it may further include the step of opening the relay element.

In an embodiment, the circuit protection method using the protection circuit may further include melting the fuse when the switch is opened when the over current is detected, but when the switch cannot be opened.

In one embodiment, in the step of fusing the fuse, when the opening of the switch is impossible, the fuse may be melted within a predetermined time.

In one embodiment, the sensing may be performed by a sensing unit connected to the outside of the protection circuit.

According to an aspect of the present invention, a protection circuit capable of efficiently protecting a circuit from overvoltage, overtemperature and overcurrent by using a switch for blocking overvoltage and overtemperature, and a fuse for blocking overcurrent, and a circuit protection method using the same Is provided.

In addition, according to another aspect of the present invention, by integrating a switch to block the abnormal voltage by opening based on the overvoltage and overtemperature, and a fuse to block the abnormal current by melting based on the overcurrent into a single device, A protection circuit and a circuit protection method using the same are provided that can reduce the cost and space consumption due to switch and fuse installations.

In addition, according to another aspect of the present invention, if any one or more of overvoltage, overtemperature and overcurrent is detected, first, by opening the switch to cut off the voltage or current, in case of failure of the switch, opening or fuse of the relay element By blocking any one or more of overvoltage, overtemperature, and overcurrent detected through the rug of the present invention, a protection circuit and a circuit protection method using the same are provided to protect the circuit from overvoltage, overtemperature, and overcurrent even when a switch fails.

1 is a view schematically showing the configuration of a protection circuit according to an embodiment of the present invention.
2 is a diagram schematically illustrating a configuration of a protection circuit according to another embodiment of the present invention.
3 is a diagram schematically illustrating a flowchart for explaining a circuit protection method using a protection circuit according to an exemplary embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Here, the repeated description, well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

In addition, the term "... unit" described in the specification means a unit for processing one or more functions or operations, which may be implemented in hardware or software or a combination of hardware and software.

1 is a view schematically showing the configuration of a protection circuit 100 according to an embodiment of the present invention.

2 is a diagram schematically showing the configuration of a protection circuit according to another embodiment of the present invention.

However, the protection circuit 100 illustrated in FIGS. 1 and 2 is according to each embodiment, and its components are not limited to the embodiments illustrated in FIGS. 1 and 2, and some components may be necessary. Note that the element may be added, changed or deleted.

First, referring to FIG. 1, a protection circuit 100 according to an embodiment of the present invention may include a protection device 110, a detector 120, and a controller 130. Components of the protection circuit 100 will be described in more detail below.

First, referring to FIGS. 1 and 2, the protection circuit 100 according to an embodiment of the present invention may be applied to a circuit to which a DC voltage is applied, but is not limited thereto.

In this case, the protection circuit 100 may include a protection device 110 that serves to energize or block an applied voltage or current based on any one or more of overvoltage, overtemperature, and overcurrent.

In more detail with reference to FIG. 1, the protection element 110 may include a fuse 111 that is melted based on an overcurrent and a switch 111 that opens or closes an electric current or a current. Can be.

Here, the switch 111 and the fuse 112 may be opened or closed or fused by the controller 130 to be described later, but is not limited thereto. For example, the fuse 112 may be melted by an overcurrent applied without additional control.

In this case, the switch 111 may be implemented as a pyro switch, but is not limited thereto.

In addition, referring to FIG. 2, the protection element 110 may further include a relay element 113 connected to the switch 111 and opened and closed based on any one or more of overvoltage and overtemperature.

Here, the relay element 113 detects an overvoltage and an overtemperature from the sensing unit 120 to be described later, but does not control the opening and closing of the switch 111 from the control unit 130 (for example, a failure of the switch 111). By opening and closing by the controller 130, the circuit 130 may serve to protect the circuit and the elements within the circuit from any one or more of overvoltage and overtemperature.

Next, the protection circuit 100 may include a detector 120 that detects any one or more of overvoltage, overtemperature, and overcurrent.

More specifically, referring to FIG. 2, the detector 120 is connected to the protection element 110 and the contactor 10 to apply a voltage applied to any one or more of the protection element 110 and the contactor 10. It can play a role in sensing.

In addition, the sensing unit 120 may serve to detect a temperature overload of any one or more of the connected protection device 110 and the contactor 10.

In addition, the detector 120 may serve to detect a current applied to any one or more of the protection element 110 and the contactor 10.

In this case, the contactor 10 is an example, which is an example to more easily describe a configuration that may be included in the protection circuit 100. Therefore, the contactor 10 must be included in the protection circuit 100. Note that this is not the case.

In addition, it is noted that the sensing unit 120 of the protection circuit 100 according to the exemplary embodiment of the present invention is not limited to being connected to the control unit 130 as shown in FIGS. 1 and 2.

For example, the detector 120 may be separately connected to the outside of the protection circuit 100.

Next, the controller 130 will be described with reference to FIGS. 1 and 2, and the controller 130 is based on any one or more of an overvoltage, an overcurrent, and an overtemperature detected by the detector 120. ) Can be controlled.

More specifically, referring to FIG. 3, when the voltage applied to the protection element 110 or the contactor 10 is equal to or greater than the rated voltage of the contactor 10, the switch 130 of the protection element 110 may be used. By opening 111, overvoltage can be prevented from being applied to the contactor 10.

In addition, the controller 130 opens the switch 111 of the protection element 110 when one or more temperature overloads of the protection element 110 or the contactor 10 are detected, thereby protecting the protection element 110 or the contact. Any one or more of the rotors 10 can be prevented from being damaged by over temperature.

On the other hand, when the control of the switch 111 is impossible (for example, when a failure of the switch 111 occurs), the controller 130 opens the relay element 113 to protect the protection element 110 or the contactor ( It is possible to prevent any one or more of 10) from being damaged by overvoltage or overtemperature.

In addition, when an overcurrent is detected from the detector 120, the controller 130 opens the switch 111 of the protection device 110 so that at least one of the protection device 110 or the contactor 10 is overcurrent. Can be prevented from being damaged.

On the other hand, the protection circuit 100 is configured such that when the control of the switch 111 is impossible (for example, when a failure of the switch 111 occurs), the fuse 112 is melted by an overcurrent, whereby the switch 111 Even in the case where the control is impossible, the circuit and the elements in the circuit can be protected from overcurrent.

However, in this case, as described above, it is noted that the fuse 112 is not limited to being melted by an overcurrent applied when the control of the switch 111 is impossible.

For example, the fuse 112 may detect an overcurrent, but when the control of the switch 111 from the controller 130 is impossible, the fuse 112 may be fused by the controller 130.

In this case, the controller 130 may fusion the fuse 112 within a predetermined time from the time when the control of the switch 111 is determined to be impossible. In this case, the predetermined time may vary depending on the setting of the operator or the circuit configuration, but is not limited thereto.

That is, the protection circuit 100 according to an embodiment of the present invention, when the over-voltage, over-temperature or over-current is detected, primarily by opening the switch 111, the circuit and the elements in the circuit from the over-voltage, over-temperature or over-current If the control of the switch 111 is impossible, the relay element 113 is opened based on the overvoltage or the overtemperature, or the fuse 112 is melted based on the overcurrent, thereby overvoltage and overtemperature. Alternatively, the circuit and the elements within the circuit can be effectively protected from overcurrent.

Next, FIG. 3 schematically illustrates a flowchart for explaining a circuit protection method using a protection circuit according to an exemplary embodiment of the present invention.

However, the circuit protection method using the protection circuit shown in FIG. 3 is according to an embodiment, and the process is not limited to the embodiment shown in FIG. 3, and some processes may be added, changed or deleted as necessary. Note that you can.

Referring to Figure 3 in more detail with respect to the circuit protection method using a protection circuit according to an embodiment of the present invention, first, any one or more of the over-voltage, over-current and over temperature is detected by the detector 120 (S301) The controller 130 opens the switch 111 of the protection element 110 (S302) to protect the circuit and the elements within the circuit from any one or more of overvoltage, overcurrent, and overtemperature.

On the other hand, when the opening and closing control of the switch 111 is not possible in the control unit 130 (for example, when a failure of the switch 111 occurs), the control unit 130 opens the relay element 113 or the fuse 112. ) To protect the circuit and the elements in the circuit from any one or more of overvoltage, overcurrent, and overtemperature.

More specifically, the control unit 130 is not possible to control the opening and closing of the switch 111, when the over-voltage or over-temperature is detected from the sensing unit 120, by opening the relay element 113, the circuit and the elements in the circuit It can protect against any one or more of overvoltage or overtemperature.

In addition, the controller 130 may not control the opening and closing of the switch 111, but when the overcurrent is detected from the sensing unit 120, the fuse 112 may be fused to protect the circuit and the elements in the circuit from the overcurrent. have.

In this case, the fuse 112 may be melted by an overcurrent applied or melted by the controller 130, but the fuse 112 is not limited thereto.

That is, in the case of a circuit protection method using a protection circuit according to an embodiment of the present invention, as one or more of an overvoltage, an overcurrent, and an overtemperature is sensed, the switch 111 is opened to open an overvoltage, If the protection from any one or more of the over-current and over-temperature, but the opening and closing control of the switch 111 is impossible, the relay element 113 is opened when the over-voltage or over-temperature is sensed, and the fuse (when the over-current is detected) By allowing 112 to be fused, the circuit and the devices within the circuit can be tailored to protect against any one or more of overvoltage, overcurrent and overtemperature, thereby allowing more effective protection of the circuit and the devices within the circuit.

In addition, by integrating the switch 111, the fuse 112 and the relay element 113 into one protection element 110 to protect the circuit and the elements in the circuit from any one or more of overvoltage, overcurrent and overtemperature. It has the advantage of reducing the size and equipment cost of the protection device 110 to protect the device in the circuit.

In this case, however, the above description is based on a circuit protection method using a protection circuit according to an embodiment of the present invention, and the circuit protection method using the protection circuit according to the present invention is not limited to the above description.

While specific embodiments of the present invention have been illustrated and described, the technical spirit of the present invention is not limited to the accompanying drawings and the above description, and various modifications can be made without departing from the spirit of the present invention. It will be apparent to those skilled in the art, and variations of this form will be regarded as belonging to the claims of the present invention without departing from the spirit of the present invention.

10: contactor
100: protection circuit
110: protection element
111: switch
112: fuse
113: relay element
120: detector
130: control unit

Claims (10)

A protection element including a switch that is opened and closed based on at least one of an overvoltage, an overcurrent, and an overtemperature, and a fuse melted based on an overcurrent applied when the switch is opened;
A detector for detecting at least one of overvoltage, overcurrent, and overtemperature; And
Characterized in that the control unit for opening the switch, if any one or more of overvoltage, overcurrent and overtemperature is detected,
Protection circuit. The method of claim 1,
The protective element,
A relay element connected to the switch and opened and closed by the controller;
The control unit,
When at least one of overvoltage and overtemperature is detected, the switch is opened, but if the switch is not possible, the relay element is opened.
Protection circuit. The method of claim 1,
The control unit,
When the over-current is detected, the switch is opened, if it is impossible to open the switch, characterized in that the fuse is melted,
Protection circuit. The method of claim 3,
The control unit,
When it is impossible to open the switch, characterized in that the fuse is melted within a predetermined time,
Protection circuit. The method of claim 1,
The detection unit,
Characterized in that connected to the outside of the protection circuit,
Protection circuit. Detecting at least one of overvoltage, overcurrent, and overtemperature;
If at least one of overvoltage, overcurrent and overtemperature is detected, opening a switch included in the protection element;
Fusing the fuse included in the protection element based on the opening of the switch by an overcurrent;
Circuit protection method using a protection circuit. The method of claim 6,
The protective element,
Further comprising a relay element connected to the switch,
The circuit protection method using the protection circuit,
When one or more of the overvoltage and overtemperature is detected, opening the switch, if it is impossible to open the switch, further comprising the step of opening the relay element,
Circuit protection method using a protection circuit. The method of claim 6,
The circuit protection method using the protection circuit,
When the overcurrent is detected, opening the switch, if it is impossible to open the switch, characterized in that it further comprises the step of melting the fuse,
Circuit protection method using a protection circuit. The method of claim 8,
In the step of fusing the fuse,
When it is impossible to open the switch, characterized in that the fuse is melted within a predetermined time,
Circuit protection method using a protection circuit. The method of claim 6,
The detecting step,
Characterized in that performed by a sensing unit connected outside of the protection circuit,
Circuit protection method using a protection circuit.

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