CN218447622U - Circuit and electronic equipment for direct current arc extinction - Google Patents

Abstract

Embodiments of the present disclosure relate to circuits and electronic devices for dc arc extinction. The circuit for dc arc extinction comprises: the first switch is connected in series between the negative electrode of the input end and the negative electrode of the output end of the circuit for direct current arc extinction; an arc extinguishing unit connected in parallel with the first switch; and a control unit configured to control on and off timings of the arc extinguishing unit and the first switch such that an impact from an off-to-on instant or an on-to-off instant of the input terminal negative electrode and the output terminal negative electrode is borne via the arc extinguishing unit. The technical scheme of the utility model a circuit that is used for direct current arc extinguishing that the reliability is high, with low costs is provided.

Description

Circuit and electronic equipment for direct current arc extinction

Technical Field

Embodiments of the present disclosure relate generally to electrical protection devices and, more particularly, to circuits and electronic devices for dc arc extinction.

Background

At present, direct current power supply plays an increasingly important role in the fields of smart power grids, smart homes and the like. The applications of electronic devices such as dc sockets and dc switches are becoming more and more widespread and important.

The main difference between dc supply and ac supply is that the voltage of the ac supply is a time-varying sine wave with zero crossings. For example, an alternating current arc, which is generated during disconnection of the plug from the socket or disconnection of the switching contacts, can be extinguished at the zero crossing point. And the voltage of the direct current power supply has no change in direction and zero crossing points. Therefore, direct current electric arcs generated in the process of plugging and unplugging the direct current socket and separating the direct current switch contact by direct current power supply are not easy to extinguish, and potential safety hazards are caused.

The known solution has the defects of complex structure, low reliability and the like. Therefore, there is a need for an improved scheme to improve the reliability of the dc arc extinguishing performance and reduce the cost.

SUMMERY OF THE UTILITY MODEL

It is an object of the present disclosure to provide a circuit for dc arc quenching that addresses, at least in part, the above problems, as well as other potential problems.

In a first aspect, embodiments of the present disclosure provide a circuit for dc arc extinction. The circuit includes: an input terminal negative electrode, an input terminal positive electrode, an output terminal negative electrode, and an output terminal positive electrode; the first switch is connected in series between the negative electrode of the input end and the negative electrode of the output end of the circuit for direct current arc extinction; an arc extinguishing unit connected in parallel with the first switch; and a control unit configured to control on and off timings of the arc extinguishing unit and the first switch such that an impact from an off-to-on instant or an on-to-off instant of the input terminal negative electrode and the output terminal negative electrode is borne via the arc extinguishing unit.

In the above-described embodiment, by controlling the on and off timings of the arc extinguishing unit and the first switch, it is possible to make the impact of the input terminal negative electrode and the output terminal negative electrode from the off to on instant or from the on to off instant received via the arc extinguishing unit, thereby preventing the arc from being generated at the first switch.

In some embodiments, the control unit is configured to send control signals to the arc extinguishing unit and the first switch when the direct current is energized, so that the arc extinguishing unit is turned on and the first switch remains off, and so that the first switch is turned on and the arc extinguishing unit is turned off after the arc extinguishing unit is turned on for a predetermined time, so that the input terminal negative electrode and the output terminal negative electrode are communicated.

In the above embodiment, the arc extinguishing unit is controlled to be turned on first when the dc power is applied, and then the first switch is turned on later, so that the electric shock generated when the first switch is turned on can be ensured to be received by the arc extinguishing unit, and the first switch does not generate an arc.

In some embodiments, the control unit is configured to send control signals to the arc extinguishing unit and the first switch when the dc power is off, so that the arc extinguishing unit is turned on in a state where the first switch remains on, and the first switch and the arc extinguishing unit are sequentially turned off after the arc extinguishing unit is turned on for a predetermined time, so as to break the input terminal negative electrode and the output terminal negative electrode.

In the above embodiment, the arc extinguishing unit is controlled to be turned off first when the direct current is cut off, and the first switch is turned off later, so that the electric shock generated when the first switch is turned off can be borne by the arc extinguishing unit, and the first switch cannot generate electric arc.

In some embodiments, the circuit for DC arc quenching further comprises a DC/DC voltage step-down module coupled between the input positive pole and the input negative pole of the circuit for DC arc quenching and configured to power the control unit.

In the above embodiments, the input voltage is stepped down by the DC/DC step-down module to provide a suitable operating voltage for the control unit power supply or other electronic devices.

In some embodiments, the circuit for dc arc quenching further comprises a trigger switch coupled to the control unit and capable of being triggered to cause the control unit to perform the control.

In the above embodiment, by providing the trigger switch, the trigger signal can be conveniently provided to the control unit so that the control unit performs control.

In some embodiments, the circuit for dc quenching further comprises a second switch connected in series between the positive input terminal and the positive output terminal of the circuit for dc quenching. The second switch is configured to: when the direct current is electrified, the direct current is conducted in response to a control signal of the receiving control unit so as to enable the positive electrode of the input end to be communicated with the positive electrode of the output end; and/or when the direct current is cut off, in response to a control signal received by the control unit, the circuit is turned off after the negative poles of the input end and the negative poles of the output end of the circuit for direct current arc extinction are broken, so that the positive poles of the input end and the positive poles of the output end are broken

In the above embodiment, by providing the second switch, the load can be completely isolated from the power supply when not operating, and electrical safety can be ensured.

In some embodiments, the arc extinguishing unit includes: and the power electronic switch is configured to be switched on or switched off in response to receiving a control signal from the control unit so as to enable the input terminal cathode and the output terminal cathode to be connected or disconnected.

In the above embodiment, by providing the power electronic switch and controlling the turn-on timing of the power electronic switch, the generation of an arc at the first switch can be effectively avoided.

In some embodiments, the arc extinguishing unit further comprises an absorption circuit connected in parallel with the power electronic switch and configured to absorb an impact on the power electronic switch from an off-to-on transient or from an on-to-off transient of the input and output cathodes.

In the above-described embodiment, by connecting the power electron tube in parallel with the absorption circuit, the electric shock in the negative bus bar can be reliably absorbed.

In some embodiments, the absorption circuit comprises: a resistor and a capacitor connected in series, coupled in parallel with the power electronic switch; or a metal oxide variable resistor coupled in parallel with the power electronic switch

In the above-described embodiments, the current or voltage surge when the first switch is turned off or on can be reliably absorbed by connecting the resistor and the capacitor in series, or connecting the metal oxide variable resistor in parallel with the power electronic switch.

In some embodiments, the absorption circuit comprises: the first connecting ends of the resistor and the capacitor are coupled with the first end of the power electronic switch and the input end anode of the circuit for direct current arc extinction; and the cathode of the diode is coupled with the second connecting end of the resistor and the second connecting end of the capacitor, and the anode of the diode is coupled with the second end of the electronic switch and the cathode of the output end of the circuit for DC arc extinction.

In the above-described embodiment, by constructing the snubber circuit in this way, the power electronic switch can be reliably protected.

In a second aspect, embodiments of the present disclosure also provide an electronic device including the circuit for dc arc extinction of the first aspect of the present disclosure.

The technical scheme of the utility model a circuit and electronic equipment that are used for direct current arc extinguishing that the reliability is high, with low costs are provided.

The following detailed description is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.

Drawings

Fig. 1 shows a schematic diagram of a circuit for dc arc quenching according to one embodiment of the present disclosure;

fig. 2 shows a schematic diagram of an arc extinguishing unit according to an embodiment of the present disclosure;

fig. 3 shows a schematic diagram of an arc extinguishing unit according to another embodiment of the present disclosure; and

fig. 4 shows a schematic diagram of a circuit for dc arc extinction according to another embodiment of the present disclosure;

like or corresponding reference characters designate like or corresponding parts throughout the several views.

Detailed Description

The principles of the present disclosure will now be described with reference to various exemplary embodiments shown in the drawings. It should be understood that these examples are described merely to enable those skilled in the art to better understand and further implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. It should be noted that where feasible, similar or identical reference numerals may be used in the figures and that similar or identical reference numerals may indicate similar or identical functions. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the invention described herein.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object.

As mentioned above, the known solutions have the drawbacks of complex structure, low reliability, etc. A mechatronic dc switch is known, which mainly includes a dc voltage unit, a control unit, an isolation arc-extinguishing unit, a key switch, and the like. The circuit structure of the scheme is complex, the device cost is high, the reliability is low, and safety accidents are easy to happen. Another integrated dc hybrid switch is known, which mainly comprises a control module, a solid-state switch on a positive bus, a switch in parallel with the solid-state switch, and a disconnector on a negative bus. The disadvantage of this solution is mainly that the solid-state switch is located on the positive bus. In order to turn on and off the solid-state switch smoothly, a PNP-type power electronic switch is required. The PNP power electronic switch has the disadvantages of large on-resistance, high price, few replacement types, and the like, and thus the cost is high.

Therefore, it is necessary to design an on-off circuit having a dc arc extinguishing function with high reliability and low cost.

Embodiments of the present disclosure provide improved circuits for dc arc quenching. In some embodiments of the present disclosure, a circuit for dc arc quenching includes a first switch, an arc quenching unit, and a control unit. The first switch is connected in series between the negative electrode of the input end and the negative electrode of the output end of the circuit for direct current arc extinction. The arc extinguishing unit is connected in parallel with the first switch. The control unit is configured to control on and off timings of the arc extinguishing unit and the first switch so that an impact of an input terminal negative electrode and an output terminal negative electrode from an off-to-on instant or an on-to-off instant is received via the arc extinguishing unit. The technical scheme of the utility model a circuit that is used for direct current arc extinguishing that the reliability is high, with low costs is provided.

The principles of the present disclosure will be described in detail below in connection with exemplary embodiments with reference to the drawings.

Fig. 1 shows a schematic diagram of a circuit for dc arc extinction according to one embodiment of the present disclosure. As shown in fig. 1, the circuit 100 for dc arc extinction generally includes a first switch K1, an arc extinction unit 20, and a control unit 30.

IN some embodiments, the first switch K1 may be connected IN series between the input terminal negative IN-and the output terminal negative Out-of the circuit 100 for dc quenching. The first switch K1 may be a relay, a contactor, or an air switch. The first switch K1 of the embodiment of the present invention is not limited to the above-mentioned devices, but may be any controllable power switch device having on and off contacts.

In some embodiments, the arc extinguishing unit 20 may be connected in parallel with the first switch K1, and adapted to withstand the impact of current and voltage in the line, so as to prevent the generation of arc. The structure of the arc extinguishing unit 20 is further described below.

In some embodiments, the control unit 30 may be configured to control the turn-on and turn-off timings of the arc extinguishing unit 20 and the first switch K1. By controlling the arc extinguishing unit 20 and the first switch K1 to be turned on and off IN a predetermined sequence, it is possible to receive the impact of the input terminal negative electrode IN-and the output terminal negative electrode Out-from the off-to-on instant or from the on-to-off instant via the arc extinguishing unit 20, thereby preventing the generation of an arc when the first switch K1 is turned on or off.

In some embodiments, the control unit 30 may be configured to send a control signal to the arc extinguishing unit 20 and the first switch K1 when the direct current is energized. For example, the control unit 30 receives a trigger signal that requires power supply to the load, and the control unit 30 may send a control signal to the arc extinguishing unit 20 and the first switch K1. For example, the control signal may first cause the arc extinguishing unit 20 to be turned on and the first switch K1 to remain off. After that, the first switch K1 may be turned on after the arc extinguishing unit 20 is turned on for a predetermined time (specifically, may be set according to actual needs, for example, 10 ms), so that the negative input terminal IN-and the negative output terminal Out-are connected. The arc extinguishing unit 20 may be turned off after the first switch K1 is turned on. In this way, by controlling the arc extinguishing unit 20 to be turned on first and then the first switch K1 to be turned on later when the dc current is applied, it can be ensured that the electric shock when the first switch K1 is turned on is received by the arc extinguishing unit 20, and thus the arc is not generated in the first switch K1.

In some embodiments, the control unit 30 may be configured to send control signals to the arc extinguishing unit 20 and the first switch K1 when the dc power is off. For example, the control unit 30 receives a trigger signal that requires power to be supplied to the load, and generates a control signal. The control signal controls the arc extinguishing unit 20 and the first switch K1, so that the arc extinguishing unit 20 is turned on when the first switch K1 is kept on, and the first switch K1 is turned off after the arc extinguishing unit 20 is turned on for a predetermined time, so that the input terminal negative electrode IN-and the output terminal negative electrode Out-are opened. In this way, by controlling the arc extinguishing unit 20 to be turned off first and then the first switch K1 to be turned off later when the direct current is cut off, it can be ensured that the electric shock when the first switch K1 is turned off is borne by the arc extinguishing unit 20, and thus, no arc is generated in the first switch K1. IN this way, by controlling the on and off timings of the arc extinguishing unit 20 and the first switch K1, it is possible to make the impact from the off to on instant or from the on to off instant of the input terminal negative electrode IN-and the output terminal negative electrode Out-borne via the arc extinguishing unit 20, thereby avoiding the generation of the arc at the first switch K1. In some embodiments, the control unit 30 may be a single chip or an MCU control circuit. The embodiments of the present disclosure are not limited thereto, and the control unit 30 may be various devices or apparatuses having a control function.

In some embodiments, the circuit 100 for dc quenching may further include a second switch K2. As shown IN fig. 1, the second switch K2 may be connected IN series IN the positive bus P of the circuit 100 for dc quenching, i.e. between the input positive terminal IN + and the output positive terminal Out +. The second switch K2 may be configured to be turned on IN response to a control signal of the reception control unit 30 when the direct current is turned on, so that the input terminal positive electrode IN + and the output terminal positive electrode Out + are connected. When the direct current is cut off, IN response to a control signal of the receiving control unit 30, the circuit 100 for direct current arc extinction is turned off after the negative IN-of the input terminal and the negative Out-of the output terminal are cut off, so that the positive IN + of the input terminal and the positive Out + of the output terminal are cut off. In this way, by providing the second switch K2, when the load does not operate, the load can be completely isolated from the power supply, and electrical safety can be ensured.

In some embodiments, the circuit 100 for DC arc extinction may further include a DC/DC voltage step-down module 10. As shown IN fig. 1, the DC/DC buck module 10 may be coupled between an input positive terminal IN + and an input negative terminal IN-of the circuit 100 for DC arc extinction and configured to power the control unit 30, the first switch K1. In this way, the DC/DC buck module 10 can provide the control unit 30 or other electronic devices with an appropriate operating voltage by stepping down the input voltage. The DC/DC buck module 10 may be an isolated circuit or a non-isolated circuit.

In some embodiments, the circuit 100 for dc arc extinction may further include a trigger switch K. The trigger switch K may be disposed between the DC/DC voltage dropping module 10 and the control unit 30, and may be triggered to cause the control unit 30 to perform control. For example, when the load needs to be powered on, the trigger switch K is activated, and the control unit 30 receives a signal from the trigger switch K and generates a control signal to control the arc extinguishing unit 20 and the first switch K1. For example, for a wall-mounted dc socket or a dc switch in which the circuit for dc arc extinction of the embodiment is installed, an operator may activate the trigger switch K by operating a corresponding key. In this way, by providing the trigger switch K, the trigger signal can be easily supplied to the control unit 30 so that the control unit 30 performs control. In some embodiments, the trigger switch K may be a tact switch or a microswitch or a key switch or a toggle switch. Embodiments of the present disclosure are not so limited. For example, in some embodiments, the trigger switch K is not limited to a mechanical switch, but may be an electro-optical switch. Furthermore, it is to be noted that the trigger switch K is not essential. It is sufficient that the circuit is arranged to provide a trigger signal to the control unit 30 when the dc current is switched on or off.

The arc extinguishing unit 20 in the circuit 100 for dc arc extinguishing according to some embodiments of the present disclosure is further described with reference to fig. 2 and 3. Fig. 2 illustrates a schematic diagram of an arc extinguishing unit 20 according to one embodiment of the present disclosure. Fig. 3 shows a schematic view of an arc extinguishing unit 20 according to another embodiment of the present disclosure.

In some embodiments, as shown in fig. 2, the arc extinguishing unit 20 includes a power electronic switch M1 and an absorption circuit. The power electronic switch M1 may be configured to turn on or off IN response to receiving a control signal from the control unit 30 to turn on or off the input terminal negative terminal IN-and the output terminal negative terminal Out-. The absorption circuit is connected IN parallel with the power electronic switch M1 and can be configured to absorb the impact of the input terminal negative pole IN-and the output terminal negative pole Out-on or on-off transients on the power electronic switch M1. The surge may be a current surge or a voltage surge. This makes it possible to protect the first switch K1.

In some embodiments, as shown in fig. 2, the snubber circuit includes a resistor R1 and a capacitor C1 connected in series. Resistor R1 and capacitor C1 are in turn coupled in parallel with power electronic switch M1. In some embodiments, the power electronic switch M1 may be a MOS power transistor, an NPN power transistor, a thyristor, or an Insulated Gate Bipolar Transistor (IGBT). The embodiments of the present disclosure are not limited thereto, and the power electronic switch M1 may be any power electronic device having a switching performance.

In some embodiments, the snubber circuit may include a metal oxide variable resistor R1. A metal oxide variable resistor R1 is coupled in parallel with the power electronic switch M1. In this way, by utilizing the characteristic that the resistance of the metal oxide variable resistor R1 changes with the voltage, the power electronic switch M1 is protected from the impact of current and voltage spikes by the change of the resistance of the metal oxide variable resistor R1 when the voltage or the current overshoots.

In some embodiments, as shown in fig. 3, the snubber circuit may include a resistor R1 and a capacitor C1 connected in parallel and a diode D1. The first connection of the resistor R1 and the capacitor C1 is coupled to the first end of the power electronic switch M1 and to the input anode IN + of the circuit 100 for dc quenching. The cathode of the diode D1 is coupled to the second connection of the resistor R1 and the capacitor C1, and the anode of the diode D1 is coupled to the second terminal of the power electronic switch M1 and to the cathode Out of the output of the circuit 100 for dc quenching. In this way, the electronic switch M1 can be reliably protected from impact by the combination of the resistor R1, the capacitor C1, and the diode D1.

As mentioned above, one known solution is to have solid-state switches on the positive bus. The solid-state switch adopts a PNP type power electronic switch M1, such as a PNP type MOS tube. The PNP type MOS tube has the defects of large on-resistance, high price, few replacement types and the like.

IN some embodiments of the present disclosure, the NPN-type power electronic switch M1, e.g., an NPN-type MOS transistor, may be employed by disposing the arc extinguishing unit 20 on the negative bus N instead of the positive bus P, i.e., between the input terminal negative electrode IN-and the output terminal negative electrode Out-. Thereby overcoming the drawbacks of the known solutions.

The operation of the circuit 100 for dc quenching of some embodiments of the present disclosure is further described below. When the load end needs to be powered on, the trigger switch K provides a trigger signal to the control unit 30, and the control unit 30 provides a control signal to the second switch K2 first, so that the second switch K2 is turned on. The positive pole IN + of the input end is connected with the positive pole Out + of the output end. At this time, only the anode IN + of the input end is connected with the anode Out + of the output end, the cathode IN-of the input end is not connected with the cathode Out-of the output end, and no impulse voltage is generated when the second switch K2 is connected. After the second switch K2 is turned on, the control unit 30 provides a control signal to the arc extinguishing unit 20 to turn on the arc extinguishing unit 20, and the negative electrode IN-of the input terminal is connected with the negative electrode Out-of the output terminal. The output end is provided with voltage output, and the load works. The arc extinguishing unit 20 is connected to the negative electrode of the power supply, so that a stable voltage difference can be generated between the control electrode of the power electronic switch and the other two electrodes, and the arc extinguishing unit 20 is stably conducted. After the arc extinguishing unit 20 is turned on, the control unit 30 provides a control signal to the first switch K1, so that the first switch K1 is turned on. Thus, the impact voltage and the impact current at the moment of the load power-on are borne by the arc extinguishing unit 20, the contact of the first switch is protected, and the service life of the first switch K1 is prolonged. After the first switch K1 is turned on, the control unit 30 cancels the control signal of the arc extinguishing unit 20, and turns off the arc extinguishing unit 20. Since the first switch K1 is turned on at this time, the output end is not affected by the turning-off of the arc extinguishing unit 20, and the load can normally operate. During the conduction period of the first switch K1, the arc extinguishing unit 20 does not work, so that the stress of a power electronic switch M1 in the arc extinguishing unit 20 can be reduced, the service life of a device is prolonged, and electricity is saved.

When the load needs to be powered off, the trigger switch K provides a trigger signal to the control unit 30, and the control unit 30 provides a control signal to the arc extinguishing unit 20, so that the arc extinguishing unit 20 is turned on. After the arc extinguishing unit 20 is turned on, the control unit 30 provides a control signal to the first switch K1, so that the first switch K1 is turned off. At this time, the arc extinguishing unit 20 is turned on, and when the first switch K1 is turned off, the contact of the first switch K1 is not arcing, and the contact is not damaged. After the first switch K1 is turned off, the control unit 30 cancels the control signal of the arc extinguishing unit 20, the arc extinguishing unit 20 is turned off, and the load end is powered off. After the load end is powered off, the control unit 30 provides a control signal to the second switch K2, so that the second switch K2 is turned off, and the power supply safety of the load end is better protected.

Further embodiments of the present disclosure are described further below in conjunction with fig. 4. Fig. 4 shows a schematic diagram of a circuit 100 for dc arc extinction according to another embodiment of the present disclosure. In some embodiments, as shown in fig. 4, the circuit 100 for dc arc quenching differs from the circuit 100 for dc arc quenching shown in fig. 1 mainly in that the second switch K2 is omitted. Fig. 4 shows the connection relationship and the operation logic of each device in the circuit 100 for dc arc extinction according to another embodiment of the present disclosure are similar to those shown in fig. 1. The same parts as in the embodiment shown in fig. 1 will therefore not be described in detail.

As shown IN fig. 4, the first switch K1 can be connected IN series between the input terminal negative terminal IN and the output terminal negative terminal Out of the circuit 100 for dc quenching. The arc extinguishing unit 20 may be connected in parallel with the first switch K1. The control unit 30 may be configured to control turn-on and turn-off timings of the arc extinguishing unit 20 and the first switch K1. The DC/DC buck module 10 may be coupled between the input positive terminal IN + and the input negative terminal IN-of the circuit 100 for DC quenching and configured to supply the control unit 30, the first switch K1 and the quenching unit 20. Compared with the circuit 100 for dc arc extinction shown in fig. 1, the circuit 100 for dc arc extinction shown in fig. 4 has a simpler structure, so that the cost can be saved without reducing the reliability.

The operation of the circuit 100 for dc arc extinction as shown in fig. 4 of some embodiments of the present disclosure is further described below. The operation of the circuit 100 for dc quenching shown in fig. 4 is generally similar to that of fig. 1.

The DC/DC voltage reduction module 10 converts the input high voltage from the input terminal positive electrode IN + and the input terminal negative electrode IN-into a low voltage, and provides a supply voltage for the trigger switch K, the control unit 30, and the first switch K1, so that they can normally operate. When the load end needs to be powered on, the trigger switch K provides a trigger signal to the control unit 30. The control unit 30 provides a control signal to the arc extinguishing unit 20 to make the arc extinguishing unit 20 first conducted, the negative electrode IN-of the input end is connected with the negative electrode Out-of the output end, the output end has voltage output, and the load works normally. The arc extinguishing unit 20 is connected to the negative electrode of the power supply, so that a stable voltage difference can be generated between the control electrode of the power device and the other two electrodes, and the arc extinguishing unit 20 is stably conducted. After the arc extinguishing unit 20 is turned on, the control unit 30 provides a control signal to the first switch K1 to turn on the first switch K1. Thus, the impact voltage and the impact current at the moment of the load power-on are borne by the arc extinguishing unit 20, the contact of the first switch K1 is protected, and the service life of the first switch K1 is prolonged. After the first switch K1 is turned on, the control unit 30 cancels the control signal of the arc extinguishing unit 20, so that the arc extinguishing unit 20 is turned off. Since the first switch K1 is turned on at this time, the arc extinguishing unit 20 is turned off without affecting the output terminal, and the load can normally operate. During the period that the first switch K1 is conducted, the arc extinguishing unit 20 does not work, the stress of an electronic switch tube in the arc extinguishing unit 20 is reduced, the service life of a device is prolonged, and electricity is saved.

When the load needs to be powered off, the trigger switch K provides a trigger signal to the control unit 30, and the control unit 30 provides a control signal to the arc extinguishing unit 20, so that the arc extinguishing unit 20 is turned on. After the arc extinguishing unit 20 is turned on, the control unit 30 provides a control signal to the first switch K1, so that the first switch K1 is turned off. At this time, the arc extinguishing unit 20 is turned on, and when the first switch K1 is turned off, the contact of the first switch K1 is not subjected to arc discharge, so that the contact is not damaged. After the first switch K1 is turned off, the control unit 30 cancels the control signal of the arc extinguishing unit 20, the arc extinguishing unit 20 is turned off, and the load end is powered off.

In the embodiment of the present disclosure, under the dc supply voltage, the first switch K1 and the arc extinguishing unit 20 are turned on in a specific logic sequence, so as to control the orderly on/off of the positive electrode and the negative electrode. The arc extinguishing unit 20 is connected in parallel with the first switch K1 of the negative electrode, so that a stable voltage difference is generated between the control electrode of the power switch tube in the arc extinguishing unit 20 and the other two electrodes, and the arc extinguishing unit 20 stably and effectively operates. The absorption circuits are connected in parallel at the two ends of the power switch tube, so that the impact voltage at the two ends of the power switch tube can be effectively restrained, and the reliability of the arc extinguishing unit 20 is improved.

It will be understood that the spirit and principles of the disclosure are illustrated in the described embodiments by including exemplary structures, however the scope of the disclosure is not limited thereto, and may have other structures. In other words, in the above embodiments, the structure of the circuit for dc arc extinction of the present disclosure is described with respect to the drawings. The structure of the circuit for dc arc extinction of the present disclosure is not limited to that shown in the drawings, but may have various other forms.

Some embodiments of the disclosure can achieve the following technical advantages: the technical scheme of the utility model the circuit that is used for direct current arc extinguishing of modified is provided, its simple structure, safe and reliable, with low costs.

In some embodiments of the present disclosure, an electronic device is also provided, which includes the above-mentioned circuit for dc arc extinction. The electronic device has improved reliability and reduced cost compared to conventional designs. The electronic device may be a wall-mounted dc outlet, a dc switch, an air switch, or the like. Embodiments of the present disclosure are not limited thereto, and may be other electronic devices.

The above description has been presented for purposes of illustration and description of the various embodiments of the disclosure, and is not intended to be exhaustive or to limit the disclosure to the precise embodiments disclosed. Although claims have been formulated in this application to particular combinations of features, it should be understood that the scope of the disclosure also includes any novel feature or any novel combination of features disclosed herein either explicitly or implicitly or any generalisation thereof, whether or not it relates to the same aspect as presently claimed in any claim. The applicants hereby give notice that new claims may be formulated to such features and/or combinations of such features during the prosecution of the present application or of any further application derived therefrom.

The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. Various modifications and alterations to this disclosure will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (11)

1. A circuit (100) for DC arc extinction, comprising: negative terminal (IN-), positive terminal (IN +), negative terminal (Out-), and positive terminal (Out +); characterized in that the circuit (100) for dc arc extinction comprises:

a first switch (K1) connected IN series between the input terminal negative electrode (IN-) and the output terminal negative electrode (Out-) of the circuit (100) for DC arc extinction;

an arc extinguishing unit (20) connected in parallel with the first switch (K1); and

a control unit (30), the control unit (30) being configured to control the on and off timings of the arc extinguishing unit (20) and the first switch (K1) such that a shock from the off-to-on instant or from the on-to-off instant is sustained via the arc extinguishing unit (20) by the input terminal negative (IN-) and the output terminal negative (Out-).

2. A circuit (100) for dc arc extinction according to claim 1, characterized IN that the control unit (30) is configured to send control signals to the arc extinction unit (20) and the first switch (K1) at dc power-on, so that the arc extinction unit (20) is turned on and the first switch (K1) remains turned off, and after the arc extinction unit (20) is turned on for a predetermined time, so that the first switch (K1) is turned on and the arc extinction unit (20) is turned off, so that the input terminal negative pole (IN-) and the output terminal negative pole (Out-) are connected.

3. The circuit (100) for dc arc extinction according to claim 1, wherein the control unit (30) is configured to send control signals to the arc extinction unit (20) and the first switch (K1) when dc power is off, so that the arc extinction unit (20) is turned on IN a state where the first switch (K1) remains on, and so that the first switch (K1) and the arc extinction unit (20) are successively turned off after a predetermined time of turning on of the arc extinction unit (20) to break the input terminal negative pole (IN-) and the output terminal negative pole (Out-).

4. A circuit (100) for dc arc extinction according to claim 1, further comprising: a trigger switch (K) coupled with the control unit (30), the trigger switch (K) being triggerable to cause the control unit (30) to perform the control.

5. A circuit (100) for direct current arc extinction according to claim 1, characterized by further comprising a DC/DC voltage step-down module (10) coupled between the input positive pole (IN +) and the input negative pole (IN-) of the circuit (100) for direct current arc extinction and configured to power the control unit (30).

6. A circuit (100) for dc arc extinction according to claim 1, further comprising:

a second switch (K2) connected IN series between the input positive (IN +) and the output positive (Out +) of the circuit (100) for DC quenching, and configured to:

when the direct current is electrified, the direct current is conducted IN response to receiving a control signal of the control unit (30) so as to enable the input end positive pole (IN +) and the output end positive pole (Out +) to be communicated; and/or

When the direct current is IN power failure, the circuit is turned off after the input end negative electrode (IN-) and the output end negative electrode (Out-) of the circuit (100) for direct current arc extinction are IN circuit breaking IN response to receiving a control signal of the control unit (30), so that the input end positive electrode (IN +) and the output end positive electrode (Out +) are IN circuit breaking.

7. A circuit (100) for dc arc extinction according to claim 1, characterized in that the arc extinction unit (20) comprises:

a power electronic switch (M1) configured to turn on or off IN response to receiving a control signal from the control unit (30) to make or break the input terminal negative pole (IN-) and the output terminal negative pole (Out-).

8. A circuit (100) for direct current arc extinction according to claim 7, characterized in that the arc extinction unit (20) further comprises:

an absorption circuit, connected IN parallel with the power electronic switch (M1), configured to absorb the impact of the negative input terminal (IN-) and the negative output terminal (Out-) on the power electronic switch (M1) from the off-to-on instant or from the on-to-off instant.

9. A circuit (100) for dc arc extinction according to claim 8, characterized in that the absorption circuit comprises:

a resistor (R1) and a capacitor (C1) connected in series, coupled in parallel with the power electronic switch (M1); or

A metal oxide variable resistor coupled in parallel with the power electronic switch (M1).

10. A circuit (100) for dc arc extinction according to claim 8, characterized in that the absorption circuit comprises:

a resistor (R1) and a capacitor (C1) connected IN parallel, a first connection of the resistor (R1) and the capacitor (C1) being coupled to a first end of the power electronic switch (M1) and to the input positive pole (IN +) of the circuit (100) for dc quenching; and

a diode (D1), a negative pole of the diode (D1) being coupled to the second connection of the resistor (R1) and the capacitor (C1), and a positive pole of the diode (D1) being coupled to the second terminal of the power electronic switch (M1) and to a negative pole (Out-) of the output of the circuit (100) for DC quenching.

11. An electronic device, characterized in that it comprises a circuit (100) for dc arc extinction according to any one of claims 1 to 10.

Images