CN115764879A - Power supply switching circuit, control method, equipment, device and power supply system - Google Patents
Power supply switching circuit, control method, equipment, device and power supply system Download PDFInfo
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- CN115764879A CN115764879A CN202211494348.1A CN202211494348A CN115764879A CN 115764879 A CN115764879 A CN 115764879A CN 202211494348 A CN202211494348 A CN 202211494348A CN 115764879 A CN115764879 A CN 115764879A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The application provides a power supply switching circuit, a control method, equipment, a device and a power supply system, wherein the power supply switching circuit comprises: the input switching circuit, the main circuit and the surge current limiting circuit are connected in series with the input switching circuit; the main circuit comprises a main switch and a control unit; the surge current limiting circuit is connected with the main circuit switch in parallel and comprises at least one thyristor and at least one resistor; the inrush current limiting circuit is used for limiting an inrush current generated when the input switching circuit switches the input voltage, and is also used for short-circuiting two ends of the main circuit switch according to the control signal when the input switching circuit needs to switch the input voltage and needs to switch the state of the main circuit switch. This application is at the switching process, through the control to the thyristor break-make, not only can reduce the surge current when two ways of switching of input, can also realize the zero voltage switching of main road switch, prevents that main road switch contact from drawing the arc adhesion and damaging, improves the life of power.
Description
Technical Field
The present application relates to the field of circuit electronics, and in particular, to a power supply switching circuit, a control method, a device, an apparatus, and a power supply system.
Background
At present, in order to prevent the influence caused by the occurrence of the abnormal accident of the input power supply, two different power supply systems are arranged in a plurality of power utilization places for future trouble. For example: the utility power supply and the motor power supply, or the utility power supply and the battery power supply, etc. adopt dual input power distribution to reduce the error influence of single input. In the power utilization scenario, an Automatic Transfer Switch (ATS) is often used. The ATS is a change-over switch, and can realize rapid on-load switching of two power supplies, so that a power supply system or a power supply can operate stably, reliably and for a long time, and the problem of shutdown caused by input switching and economic loss is avoided.
However, when different power supplies are switched through the ATS, and when the main circuit switch is switched between open and closed, the contact of the main circuit switch carries current, which easily causes arcing adhesion during switching, thereby reducing the service life of the main circuit switch.
It should be noted that the above background description is provided only for the sake of clarity and complete description of the technical solutions of the present application, and for the sake of understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
Disclosure of Invention
The application provides a power supply switching circuit to at least, solve present Automatic Transfer Switch (ATS) when input voltage switches, main circuit switch contact can carry electric current, draws the problem that the arc adhesion, reduces the life-span of main circuit switch when causing the switching easily.
Therefore, in order to solve the above problems, the present application provides a power supply switching circuit including:
the input switching circuit, the main circuit and the surge current limiting circuit are connected in series with the input switching circuit; wherein the content of the first and second substances,
the main circuit comprises a main switch and a control unit;
the surge current limiting circuit is connected with the main circuit switch in parallel and comprises at least one thyristor and at least one resistor;
the surge current limiting circuit is used for limiting surge current generated by the input switching circuit when the input voltage is switched; and the surge current limiting circuit is also used for switching the two ends of the main circuit switch to be short-circuited according to the control signal of the control unit under the condition that the input switching circuit needs to switch the input voltage and the main circuit needs to switch the state of the main circuit switch.
In one embodiment, one end of the input switching circuit is connected with the input end of the main circuit, and the other end of the input switching circuit is respectively connected with at least two input power supplies; the input switching circuit is used for realizing on-load switching among different input power supplies;
the input switching circuit includes a bypass switch.
In one embodiment, the input switching circuit includes a first branch and a second branch, and the branch switch includes: the output end of the first branch circuit is coupled with the output end of the second branch circuit.
In one embodiment, an inrush current limiting circuit includes: at least one first thyristor, at least one second thyristor and at least one resistor.
In one embodiment, an inrush current limiting circuit includes: a first thyristor, a second thyristor and a resistor;
the second thyristor is connected with the resistor in parallel and then connected with the first thyristor in series;
before the input switching circuit switches the input voltage, the control unit turns on the first thyristor and the second thyristor so that the voltage at two ends of the main circuit switch which are electrically contacted is 0.
In one embodiment, the main circuit includes at least one capacitor;
the inrush current limiting circuit includes: a second thyristor and a surge resistor;
the second thyristor is connected in parallel with the resistor, and when the capacitor voltage in the capacitor is higher than the input voltage of the power supply switching circuit, the control unit enables the second switch on the second branch circuit to be attracted, so that no impact current exists on the main circuit switch when the input voltage is switched.
According to another aspect of the present application, there is also provided a control method of a switching circuit, which is applied to the above power supply switching circuit, the control method of the switching circuit including:
under the condition that the input switching circuit needs to switch the input voltage and the main circuit needs to switch the state of the main circuit switch, the thyristor in the surge current limiting circuit is controlled to short circuit two ends of the main circuit switch according to the control signal of the control unit.
In one embodiment, a method for controlling a switching circuit includes:
before the input voltage of the power supply switching circuit is switched and the main circuit switch is disconnected, a thyristor in the surge current limiting circuit is switched on first, so that two ends of the main circuit switch are short-circuited, and the zero-voltage disconnection of the main circuit switch is realized;
after the input voltage is switched, before the main circuit switch is switched on, a thyristor in the surge current limiting circuit is switched on first, so that two ends of the main circuit switch are short-circuited, and the main circuit switch is switched on at zero voltage.
In one embodiment, the control method of the switching circuit further includes:
when the input voltage is switched, after the main circuit switch and the first switch in the first branch circuit are disconnected, the thyristor in the surge current limiting circuit is turned off, and the surge current generated when the input voltage is switched at the moment is reduced.
According to the third aspect of the present application, there is also provided an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method of any one of the switching circuits when executing the program.
According to a fourth aspect of the present application, there is also provided a power supply switching device, including any one of the power supply switching circuits described above.
According to a fifth aspect of the present application, there is also provided a power supply system including: the power supply switching circuit comprises at least one power supply switching circuit and at least two input power supplies, wherein the output ends of the at least two input power supplies are connected with the input end of the power supply switching circuit.
The application provides a power supply switching circuit, a control method, equipment, a device and a power supply system, in the switching process, through the control on the on-off of a thyristor, the surge current when two paths of input are switched can be reduced, the zero voltage switching of a main circuit switch can be realized, the arc discharge adhesion damage of contacts of the main circuit switch is prevented, and the service life of a power supply is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a power supply switching circuit diagram according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an inrush current limiting circuit provided in an embodiment of the present application.
Fig. 3 is a timing diagram of input switching of two voltages in the embodiment of the present application.
Fig. 4 is a schematic diagram of another inrush current limiting circuit provided in an embodiment of the present application.
Fig. 5 is a block diagram of a control device according to an embodiment of the present disclosure.
Fig. 6 is a specific implementation of an electronic device in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to prevent the influence caused by the abnormal accident of the input power supply, two different power supply systems are arranged in a plurality of power utilization places for later use. Surge current can be generated when two different power supply systems are switched, and the contacts of the main circuit relay are electrified and can be pulled to be adhered during switching.
In order to solve the above problem, the present application provides a power supply switching circuit, as shown in fig. 1, including: the input switching circuit, the main circuit and the surge current limiting circuit are connected in series with the input switching circuit; wherein the content of the first and second substances,
the main circuit comprises a main switch and a control unit, wherein the main switch can be;
an inrush current limiting circuit is connected in parallel with the main circuit switch, and the inrush current limiting circuit includes at least one thyristor and at least one resistor, which may be a common resistor or an anti-inrush resistor, such as a Negative Temperature Coefficient (NTC) thermistor.
The surge current limiting circuit is used for limiting surge current generated when the input switching circuit is switched among different power supplies; and when the input voltage is switched among different power supplies, the surge current limiting circuit is used for short-circuiting two ends of the main circuit relay when the switching state of the main circuit relay is switched according to the control signal of the control unit. The main circuit further comprises at least one capacitor.
In one embodiment, one end of the input switching circuit is connected with the input end of the main circuit, and the other end of the input switching circuit is respectively connected with at least two input power supplies; the input switching circuit is used for realizing on-load switching among different input power supplies;
the input switching circuit includes a bypass switch.
Specifically, the input switching circuit may be an input switching circuit for switching different input electric energies, such as an ATS switching circuit, and the input switching circuit includes at least two input terminals, and the at least two input terminals of the input switching circuit are respectively connected to different power sources or power supply systems, power supply devices, energy storage devices, redundant power sources, and the like. The input switching circuit comprises at least two branch circuits, each branch circuit comprises at least one branch switch, and each branch switch comprises at least one branch relay. The branch switch may be a relay, a switch circuit with the same function, or other controllable switches. The switching among different power supplies or power supply systems, power supply devices, energy storage devices and redundant power supplies can be realized by controlling the switching state of the branch switches on each branch circuit, and the problem of abnormal power supply at the input end of the power supply switching circuit can be avoided.
In one embodiment, the input switching circuit includes a common mode inductor and a branch relay.
In one embodiment, the power switching circuit is composed of two parts, namely an input switching circuit (ATS) circuit, a main circuit connected in series with the ATS circuit, and an Inrush current limiting circuit connected in parallel with a main circuit switch in the main circuit, wherein the main circuit and the Inrush current limiting circuit together constitute an EMI & Inrush current protection circuit. One end of the input switching circuit is connected with the power supply, and the input switching circuit is used for switching among a plurality of sets of power supply systems. Be equipped with a main circuit relay at the main circuit, when power supply system need switch input voltage, thereby easy electrified on the contact of main circuit relay causes the arc adhesion of drawing, consequently, it has a surge current limiting circuit to connect in parallel on the main circuit relay, the thyristor on the surge current limiting circuit plays the effect of switch, when the thyristor was switched on, short circuit main circuit relay both ends for main circuit relay both ends voltage is 0, be convenient for realize main circuit relay zero voltage and switch, surge current limiting circuit's existence has fully avoided when main circuit relay switches, electrified condition on the contact.
In one embodiment, the input switching circuit includes a first branch and a second branch, and an output terminal of the first branch is coupled to an output terminal of the second branch. The first branch and the second branch respectively comprise two sub-branches, one sub-branch is connected with the live wire, and the other sub-branch is connected with the zero wire. The input end of the first branch is connected with the output end of the first input power supply or the first power supply equipment and the power supply system, and the input end of the second branch is connected with the output end of the second input power supply or the second power supply equipment and the power supply system.
In a possible embodiment, at least one common-mode inductor and at least one pair of branch relays are respectively arranged on the first branch and the second branch; or at least one common mode inductor and at least one branch circuit relay are respectively arranged on the first branch circuit and the second branch circuit.
In one embodiment, as shown in fig. 1, when there are two power supply systems, the input switching circuit includes two branches, i.e., a branch a and a branch B.
The A branch comprises at least two sub-branches, one sub-branch is connected to a live wire of the first set of power supply system, the other sub-branch is connected to a zero wire of the first set of power supply system, and a common mode inductor and at least one relay A are connected in series on the two sub-branches.
The branch B comprises two sub-branches, one sub-branch is connected to a live wire of the second set of power supply system, the other sub-branch is connected to a zero wire of the second set of power supply system, and an inductance coil and at least one relay B are respectively connected in series on the two sub-branches.
Take a main circuit switch as a main circuit relay as an example:
when the branch A is switched on, current flows through the relay A through the common-mode inductor on the branch A and then is input into the main circuit, and the current flows to the switched-on main circuit relay through the two capacitors and the two common-mode inductors arranged in the main circuit. In a specific embodiment, as shown in fig. 1, the main circuit includes two capacitors, two common mode inductors are disposed between the two capacitors, two ends of the two capacitors are respectively connected to the zero line and the live line, the capacitors are used for storing electric energy, and the common mode inductors include a first coil and a second coil and are used for filtering common mode electromagnetic interference signals in the switching power supply. The first capacitor is connected with one end of the live wire and connected with a first coil of the first common mode inductor, and the first capacitor is connected with one end of the zero wire and connected with a second coil of the first common mode inductor; the second capacitor is connected with one end of the live wire and connected with the first coil of the second common mode inductor, and the second capacitor is connected with one end of the zero wire and connected with the second coil of the second common mode inductor.
When the branch B is switched on, current flows through the relay B through the common-mode inductor on the branch B and then is input into the main circuit, and the current flows to the switched-on main circuit relay through the two capacitors and the two common-mode inductors arranged in the main circuit. In a specific embodiment, as shown in fig. 1, the main circuit includes two capacitors, two common mode inductors are disposed between the two capacitors, two ends of the two capacitors are respectively connected to the zero line and the live line, the capacitors are used for storing electric energy, and the common mode inductors include a first coil and a second coil and are used for filtering common mode electromagnetic interference signals in the switching power supply. The first capacitor is connected with one end of the live wire and connected with a first coil of the first common mode inductor, and the first capacitor is connected with one end of the zero wire and connected with a second coil of the first common mode inductor; the second capacitor is connected with one end of the live wire and connected with a first coil of the second common-mode inductor, and the second capacitor is connected with one end of the zero line and connected with a second coil of the second common-mode inductor.
In one embodiment, an inrush current limiting circuit includes: at least one first thyristor, at least one second thyristor and at least one resistor.
Specifically, at least one first thyristor constitutes a first controllable switching circuit; at least one second thyristor constitutes a second controllable switch circuit; at least one resistor constitutes an anti-surge resistor circuit. The anti-surge resistance circuit is connected with the second controllable switch circuit in parallel and then connected with the first controllable switch circuit in series.
In one embodiment, an inrush current limiting circuit includes: a first thyristor, a second thyristor and a resistor; the resistor may be a common resistor or an anti-surge resistor, such as a Negative Temperature Coefficient (NTC) thermistor, which is not limited in this application; the anti-surge resistor has the effect of limiting surge current generated when the AB branch input voltage is switched, and if the anti-surge resistor is not connected in parallel to the main circuit relay, the voltage difference between the input voltage and the capacitor voltage is very large without passing through the anti-surge resistor, so that the risk of breaking a fuse and opening the circuit in an idle mode is caused, and the circuit is damaged.
The second thyristor is connected with the resistor in parallel and then connected with the first thyristor in series;
before input voltage switches, namely before a power supply switching circuit needs to switch an input power supply or power supply equipment and a power supply system of an input end, the control unit switches on the first thyristor and the second thyristor so that the voltage of two ends of the main circuit relay which is electrically contacted is 0, so that the main circuit relay can realize zero voltage switching, and the condition that the contact of the main circuit relay is electrified when the main circuit relay is switched is avoided.
In a specific embodiment, the inrush current limiting circuit connected in parallel to the main circuit relay may be composed of two thyristors AB, as shown in fig. 2, and the thyristor B is connected in parallel with the anti-surge resistor and then connected in series with the thyristor a.
The timing diagram of the input switching of the two paths of input voltages is shown in fig. 3, when the control unit detects that the input of the branch a is powered down or the input voltage is abnormal at the time of T0, the control unit sends a driving signal (such as a thyristor AB driving signal in fig. 3), the driving signal is used for turning on the thyristor a and the thyristor B, and the thyristor a and the thyristor B are turned on at the time of T1, at this time, the voltage at two ends of the main circuit relay which is electrically contacted is 0, and the zero voltage switching of the main circuit relay is ensured, which is the operation before the voltage switching.
In a specific embodiment, as shown in fig. 3, when the input voltage is switched at time T2, and the voltage across the main relay is 0, the control unit sends out a main relay driving signal to disconnect the main relay, and then sends out a relay a driving signal and a relay B driving signal to disconnect the relays on the branch a; at the time of T3, the main circuit relay and the relay A are completely disconnected, and the control unit sends out a thyristor AB driving signal to disconnect the thyristor A and the thyristor B and reduce surge current during voltage switching; at the time of T4, a relay B on the branch B is switched on, and then a thyristor A, a thyristor B and a main circuit relay are switched on; at the moment of T5, as the switching-on time of the thyristor is faster than the switching-on time of the main circuit relay, the thyristor A and the thyristor B are completely switched on when the main circuit relay is attracted, the voltage at two ends of a contact of the main circuit relay is zero, the main circuit relay is switched on under the condition of zero voltage, the input switching circuit completes the switching between different input voltages at the moment, the arc striking adhesion when the contact is switched by current is avoided, and the service life of the main circuit relay is prolonged.
The reason why the thyristor AB is turned off before the relay on the branch B is turned on is to completely turn off the main circuit, and when the relay on the branch B is turned on at the next moment, the relay on the branch B is switched by zero current, so that the service life of the relay on the branch B is ensured.
In another embodiment of the present application, there is further provided a structure of an inrush current limiting circuit, as shown in fig. 4, specifically including: a second thyristor and a resistor;
the second thyristor is connected with the resistor in parallel, and when the capacitor voltage in the capacitor is higher than the input voltage, the control unit enables the relay on the second branch circuit to be attracted, so that no impact current exists on the main circuit relay when the voltage is switched.
The resistor may be a common resistor or an anti-surge resistor, such as a Negative Temperature Coefficient (NTC) thermistor, which is not limited in this application. The main circuit includes at least one capacitor.
In a specific embodiment, when only one thyristor B is in the inrush current limiting circuit and there is no thyristor a, at this time, the control unit needs to judge whether the capacitor voltage on the left side of the main circuit relay is higher than the input voltage, when the capacitor voltage is higher than the input voltage, no current flows through the relay, the voltage at two ends of the relay is 0 at this time, zero current is turned on, and safety is achieved.
Therefore, at this moment, the control unit needs to judge whether the capacitor voltage of the first capacitor and the second capacitor on the left of the main circuit relay is higher than the input voltage (as shown in fig. 1), when the capacitor voltage is higher than the input voltage, no current flows through the main circuit relay, the voltage at the two ends of the main circuit relay is 0 at this moment, zero current is turned on, and the main circuit relay is safe, so that the control circuit enables the relay B on the branch B to be attracted, so that the relay B on the branch B does not have impact current during switching, zero current switching is realized, and the service life of the relay is ensured.
In one embodiment, a common mode inductor and two pairs of relays are connected in series on the first branch.
In one embodiment, a common mode inductor and two pairs of relays are connected in series to the second branch.
Specifically, the number of the relays on the first branch and the second branch may be set according to actual conditions, and the application is not limited thereto. The common mode inductor is used for filtering common mode electromagnetic interference signals, and meanwhile, the common mode inductor also plays a role in EMI filtering and is used for inhibiting electromagnetic waves generated by the high-speed signal line from being radiated and emitted outwards.
In one embodiment, in the main circuit, the main circuit relay is connected in series with two common mode inductors, and each common mode inductor is connected in parallel with a capacitor.
In one embodiment, the common mode inductor is used for filtering common mode electromagnetic interference signals and simultaneously inhibiting electromagnetic waves generated by the high speed signal line from radiating and emitting outwards. The capacitor is used for storing electric energy, so that the power grid can be in a balanced state, and the power supply circuit is prevented from being suddenly powered off.
In a specific embodiment, the closing time of the relay, the main circuit switch, and the branch circuit switch referred to in this application is greater than the opening time, for example, a relay with a closing time of 6ms and an opening time of 2ms may be selected, which is only for illustration and is not limited to a great extent, and another relay with a closing time greater than the opening time may also be selected.
The control method of the switching circuit provided in the embodiment of the present application is applied to the power supply switching circuit in any one of the above embodiments, and the control method of the switching circuit includes:
under the condition that the input switching circuit needs to switch the input voltage and the main circuit needs to switch the state of the main circuit switch, the thyristor in the surge current limiting circuit is controlled to short circuit two ends of the main circuit switch according to the control signal of the control unit.
In one possible embodiment, a control method of a switching circuit includes: before the input voltage of the power supply switching circuit is switched and the main circuit switch is disconnected, a thyristor in the surge current limiting circuit is switched on first, so that two ends of the main circuit switch are short-circuited, and the zero-voltage disconnection of the main circuit switch is realized; after the input voltage is switched, before the main circuit switch is switched on, a thyristor in the surge current limiting circuit is switched on first, so that two ends of the main circuit switch are short-circuited, and the main circuit switch is switched on at zero voltage.
In a possible embodiment, the control method of the switching circuit further includes: when the input voltage is switched, after the main circuit switch and the first switch in the first branch circuit are disconnected, the thyristor in the surge current limiting circuit is turned off, and the surge current generated when the input voltage is switched at the moment is reduced.
In a specific embodiment, reference may be made to the timing control method of fig. 3 in the above embodiment:
the timing diagram of the input switching of the two paths of input voltages is shown in fig. 3, when the control unit detects that the input of the branch a is powered down or the input voltage is abnormal at the time of T0, the control unit sends a driving signal (such as a thyristor AB driving signal in fig. 3), the driving signal is used for opening a thyristor a and a thyristor B, and the thyristor a and the thyristor B are opened at the time of T1, and at this time, the voltage at the two ends of the main circuit relay which is in contact with electricity is 0, so that the zero voltage switching of the main circuit relay is ensured, which is the operation before the voltage switching; when the input voltage is switched at the time of T2, the voltage at two ends of the main relay is 0, the control unit sends out a main relay driving signal so as to disconnect the main relay, and then the control unit sends out a relay A driving signal and a relay B driving signal so as to disconnect the relay on the branch A; at the moment of T3, the main circuit relay and the relay A are completely disconnected, and meanwhile, the control unit sends out a thyristor AB driving signal to disconnect the thyristor A and the thyristor B, so that surge current during voltage switching is reduced; when the relay B on the branch B is switched on at the moment T4, the thyristor A, the thyristor B and the main circuit relay are switched on; at the moment of T5, as the switching-on time of the thyristor is faster than the switching-on time of the main circuit relay, the thyristor A and the thyristor B are completely switched on when the main circuit relay is attracted, the voltage at two ends of a contact of the main circuit relay is zero, the main circuit relay is switched on under the condition of zero voltage, the input switching circuit completes the switching between different input voltages at the moment, the arc striking adhesion when the contact is switched by current is avoided, and the service life of the main circuit relay is prolonged.
The reason why the thyristor AB is turned off before the relay on the branch B is turned on is to completely turn off the main circuit, and when the relay on the branch B is turned on at the next moment, the relay on the branch B is switched by zero current, so that the service life of the relay on the branch B is ensured.
For the control method of the power supply switching circuit provided in the foregoing embodiment, the present embodiment also provides a control device of the power supply switching circuit, which can be used to implement the method described in the foregoing embodiment, as described in the following embodiment. Since the principle of solving the problem of the control device of the power supply switching circuit is similar to that of the control method of the power supply switching circuit, the implementation of the control device of the power supply switching circuit can be referred to the implementation of the control method of the power supply switching circuit. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
As shown in fig. 5, the control device includes:
the thyristor switching-on unit 501 is used for switching on a thyristor in the surge current limiting circuit before switching input voltage and before switching off the main circuit relay so as to realize zero-voltage switching-off of the main circuit relay;
the thyristor turn-off unit 502 is configured to turn off a thyristor in the inrush current limiting circuit after the main circuit relay and the relay in the first branch circuit are turned off during input voltage switching, so as to reduce an inrush current during input switching;
and the sequential turn-on unit 503 is used for turning on a thyristor in the surge current limiting circuit first to realize zero-voltage turn-on of the main circuit relay before the main circuit relay is turned on after the input voltage is switched.
This application makes the main circuit relay short circuit through surge current limiting circuit when input voltage switches, make main circuit relay disconnection and closure be zero voltage switching, the contact electrified current and the arc adhesion that draws that leads to when having avoided the main circuit relay to switch, the life-span of main circuit relay has been improved, and then power life and reliability have been improved, the characteristic design who combines the closed disconnection of switch simultaneously has optimized the switching time sequence of ATS switch, ATS switching total time has been reduced, the circuit design cost is reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
An embodiment of the present application further provides a specific implementation manner of an electronic device, which is capable of implementing all steps in the method in the foregoing embodiment, and referring to fig. 6, the electronic device specifically includes the following contents:
a processor (processor) 601, a memory 602, a communication Interface 603, a bus 604, and a non-volatile memory 605;
the processor 601, the memory 602, and the communication interface 603 complete mutual communication through the bus 604;
the processor 601 is configured to call the computer programs in the memory 602 and the nonvolatile memory 605, and when the processor executes the computer programs, the processor implements all the steps of the method in the foregoing embodiments.
Embodiments of the present application also provide a computer-readable storage medium capable of implementing all the steps of the method in the above embodiments, where the computer-readable storage medium stores thereon a computer program, and the computer program when executed by a processor implements all the steps of the method in the above embodiments, for example, the processor implements the following steps when executing the computer program:
before the input voltage is switched and the main circuit relay is disconnected, a thyristor in the surge current limiting circuit is switched on first, and the main circuit relay is disconnected in a zero voltage mode;
when the input voltage is switched, after the main circuit relay and the relay in the first branch circuit are disconnected, the thyristor in the surge current limiting circuit is turned off, and the surge current during the input switching is reduced;
after the input voltage is switched, before the main circuit relay is switched on, a thyristor in the surge current limiting circuit is switched on first, and the main circuit relay is switched on at zero voltage.
The embodiment of the present application provides a power supply switching device, where the power supply switching device includes any one of the power supply switching circuits in the foregoing embodiments, and specific implementation manners may refer to the foregoing embodiments, which are not described herein too much.
An embodiment of the present application provides a power supply system, which includes: at least one power supply switching circuit as in any one of the previous embodiments, at least two input power sources, and output terminals of the at least two input power sources are connected to input terminals of the power supply switching circuit. The input power source may be any one of a power supply device, an energy storage device, a redundant power source, and the like.
The principle and the implementation mode of the present application are explained by applying specific embodiments in the present application, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. In the description herein, references to the description of "an embodiment," "a particular embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments herein.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.
Claims (12)
1. A power supply switching circuit, comprising:
the input switching circuit, the main circuit and the surge current limiting circuit are connected with the input switching circuit in series; wherein the content of the first and second substances,
the main circuit comprises a main switch and a control unit;
the inrush current limiting circuit is connected with the main circuit switch in parallel and comprises at least one thyristor and at least one resistor;
the surge current limiting circuit is used for limiting surge current generated by the input switching circuit when switching input voltage; the inrush current limiting circuit is further configured to short-circuit two ends of the main circuit switch according to a control signal switch of the control unit when the input switching circuit needs to switch the input voltage and the main circuit needs to switch the state of the main circuit switch.
2. The power supply switching circuit according to claim 1, wherein one end of the input switching circuit is connected to the input end of the main circuit, and the other end is connected to at least two input power supplies, respectively; the input switching circuit is used for realizing on-load switching among different input power supplies;
the input switching circuit includes a branch switch.
3. The power supply switching circuit of claim 2, wherein the input switching circuit comprises a first branch and a second branch, and wherein the branch switch comprises: the output end of the first branch circuit is coupled with the output end of the second branch circuit.
4. The power supply switching circuit of claim 3, wherein the inrush current limiting circuit comprises: at least one first thyristor, at least one second thyristor and the at least one resistor.
5. The power supply switching circuit of claim 4, wherein the inrush current limiting circuit comprises: the first thyristor, the second thyristor and the resistor;
the second thyristor is connected with the resistor in parallel and then connected with the first thyristor in series;
before the input switching circuit switches the input voltage, the control unit turns on the first thyristor and the second thyristor so that the voltage at two ends of the main circuit switch is 0.
6. The power supply switching circuit according to claim 3, wherein the main circuit comprises at least one capacitor;
the inrush current limiting circuit includes: a second thyristor and a surge resistor;
the second thyristor is connected in parallel with the resistor, and when the capacitor voltage in the capacitor is higher than the input voltage of the power supply switching circuit, the control unit enables the second switch on the second branch circuit to be attracted, so that no impact current exists on the main circuit switch when the input voltage is switched.
7. A control method of a switching circuit, which is applied to the power supply switching circuit according to any one of claims 1 to 6, the control method of the switching circuit comprising:
under the condition that the input switching circuit needs to switch the input voltage and the main circuit needs to switch the state of the main circuit switch, the thyristor in the surge current limiting circuit is controlled according to the control signal of the control unit to short circuit two ends of the main circuit switch.
8. The method according to claim 7, wherein the method comprises:
before the input voltage of the power supply switching circuit is switched and the main circuit switch is disconnected, the thyristor in the surge current limiting circuit is turned on firstly, so that two ends of the main circuit switch are short-circuited, and the main circuit switch is disconnected in zero voltage;
after the input voltage is switched, before the main circuit switch is switched on, the thyristor in the surge current limiting circuit is switched on first, so that two ends of the main circuit switch are short-circuited, and the main circuit switch is switched on at zero voltage.
9. The method for controlling a switching circuit according to any one of claims 7 to 8, further comprising:
when the input voltage is switched, after the main circuit switch and the first switch in the first branch circuit are disconnected, the thyristor in the surge current limiting circuit is turned off, and the surge current generated when the input voltage is switched at the moment is reduced.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of controlling a switching circuit according to any of claims 7-9 are implemented when the program is executed by the processor.
11. A power supply switching apparatus, characterized in that the power supply switching apparatus comprises the power supply switching circuit according to any one of claims 1 to 6.
12. A power supply system, characterized in that the power supply system comprises: at least one supply switching circuit as claimed in any one of claims 1 to 6, at least two input power sources, the outputs of the at least two input power sources being connected to the inputs of the supply switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494348.1A CN115764879A (en) | 2022-11-25 | 2022-11-25 | Power supply switching circuit, control method, equipment, device and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494348.1A CN115764879A (en) | 2022-11-25 | 2022-11-25 | Power supply switching circuit, control method, equipment, device and power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115764879A true CN115764879A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211494348.1A Pending CN115764879A (en) | 2022-11-25 | 2022-11-25 | Power supply switching circuit, control method, equipment, device and power supply system |
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| Country | Link |
|---|---|
| CN (1) | CN115764879A (en) |
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2022
- 2022-11-25 CN CN202211494348.1A patent/CN115764879A/en active Pending
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