CN111525675A - Alternating current-direct current switching power supply circuit and method and circuit breaker - Google Patents
Alternating current-direct current switching power supply circuit and method and circuit breaker Download PDFInfo
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Abstract
The embodiment of the invention discloses an alternating current-direct current switching power supply circuit, a method and a circuit breaker. The alternating current-direct current switching power supply circuit comprises a switching circuit, a power supply switch, an arc extinguishing circuit, an alternating current power supply input end, a direct current power supply input end and a power supply output end; when the switching circuit controls the connection between the input end of the alternating current power supply and the power supply switch, the switching circuit controls the disconnection between the arc extinguishing circuit and the power supply output end, so that when the input end of the alternating current power supply is connected with the power supply switch, the direct current power supply is disconnected with the power supply output end, and alternating current power supply is realized when the power supply switch is closed; and when the direct current power supply input end is controlled to be conducted with the power supply switch, the arc extinguishing circuit is controlled to be conducted with the power supply output end, so that the direct current power supply is conducted with the power supply output end, and direct current power supply is achieved when the power supply switch is closed. Therefore, the alternating current power supply and the direct current power supply can be conveniently switched by only one switching circuit, and the power supply efficiency and the power supply reliability of the load are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of electricity, in particular to an alternating current and direct current switching power supply circuit, an alternating current and direct current switching power supply method and a circuit breaker.
Background
The alternating current-direct current hybrid power distribution network combines the advantages of alternating current and direct current, and can provide a more reliable and efficient power supply mode for users. Dc power supplies represent a certain advantage in efficiency, ac power supplies dominate in cost and stability, and ac and dc power will still have different advantages and coexist in the present and longer time in the future.
Nowadays, various electric appliances are also gradually supporting dc power input while still adapting to ac power input, such as air conditioners, televisions, IT servers, charging piles, and the like. The switching power supply of the alternating current and direct current power supplies usually designs independent power supply circuits for the direct current power supplies and the alternating current power supplies respectively, and meanwhile circuit breakers are matched in respective circuits, so that the direct current circuit breakers are used for switching to the direct current circuits when the direct current power supplies are needed, and the alternating current circuit breakers are used for switching to the alternating current circuits when the alternating current power supplies are needed.
Disclosure of Invention
The embodiment of the invention provides an alternating current-direct current switching power supply circuit, a method and a circuit breaker, which are used for realizing convenient switching of an alternating current power supply and a direct current power supply through only one switching circuit and improving the power supply efficiency and the power supply reliability of a load.
In a first aspect, an embodiment of the present invention provides an ac/dc switching power supply circuit, including: the arc extinguishing device comprises a switching circuit, a power supply switch, an arc extinguishing circuit, an alternating current power supply input end, a direct current power supply input end and a power supply output end, wherein the power supply output end is used for being connected with a load;
the power supply switch comprises a first end and a second end, and the second end is electrically connected with the power supply output end;
the arc extinguishing circuit comprises a third end and a fourth end, and the third end is electrically connected with the input end of the direct-current power supply;
the switching circuit is respectively electrically connected with the input end of the alternating current power supply, the first end, the second end, the third end and the fourth end and is used for controlling the conduction state between the input end of the alternating current power supply and the first end, the conduction state between the third end and the first end and the conduction state between the fourth end and the second end; when the input end of the alternating current power supply is controlled to be conducted with the first end, the fourth end and the second end are controlled to be disconnected; and controlling the fourth end to be conducted with the second end when controlling the third end to be conducted with the first end.
Optionally, the switching circuit comprises a first switch and a second switch;
the first change-over switch comprises a first contact, a second contact and a common contact, and the second change-over switch comprises a third contact and a fourth contact;
the first contact is electrically connected with the input end of the alternating current power supply, the second contact is electrically connected with the third end of the arc extinguishing circuit, and the common contact is electrically connected with the first end of the power supply switch; the third contact is electrically connected with the fourth end of the arc extinguishing circuit, and the fourth contact is connected with the second end of the power supply switch.
Optionally, the first and second switches are mechanical ganged switches.
Optionally, the detection circuit further comprises a controller, wherein the controller comprises a first detection end, a second detection end, a first output end and a second output end; the first change-over switch and the second change-over switch comprise control ends;
the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch.
The controller is used for outputting a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage; outputting a second control signal through a second output end to control the fourth contact to be connected with the third contact;
the controller is further configured to output a third control signal through the first output terminal to control the second contact to be disconnected from the common contact, control the first contact to be connected to the common contact, and output a fourth control signal through the second output terminal to control the fourth contact to be disconnected from the third contact when the second voltage detection signal of the second detection terminal is smaller than the second threshold voltage.
Optionally, the detection circuit further comprises a controller, wherein the controller comprises a first detection end, a second detection end and an output end; the first switch comprises a control end;
the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, the output end is electrically connected with the control end of the first change-over switch, the controller is used for outputting a first control signal through the output end to control the disconnection of the first contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, and the second contact is connected with the common contact;
the controller is also used for outputting a second control signal through the output end to control the connection between the first contact and the common contact when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, and the second contact is disconnected with the common contact;
when the first contact is connected with the common contact, the third contact is disconnected with the fourth contact; when the second contact is connected with the common contact, the third contact is connected with the fourth contact.
Optionally, the arc extinguishing circuit comprises an absorption circuit and a coupled negative voltage circuit; the absorption circuit is connected with the coupling negative voltage circuit in parallel.
In a second aspect, an embodiment of the present invention further provides an ac/dc switching power supply method, which is applied to any one of the ac/dc switching power supply circuits in the first aspect, where the ac/dc switching power supply method includes:
when the input end of the alternating current power supply is controlled to be conducted with the first end, the fourth end and the second end are controlled to be disconnected; and controlling the fourth end to be conducted with the second end when controlling the third end to be conducted with the first end.
Optionally, the ac-dc switching power supply circuit further includes a controller, and the controller includes a first detection end, a second detection end, a first output end, and a second output end; the first change-over switch and the second change-over switch comprise control ends; the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch;
when the input end of the alternating current power supply is controlled to be conducted with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third end to conduct with the first end, controlling the fourth end to conduct with the second end, including:
when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact; outputting a second control signal through a second output end to control the fourth contact to be connected with the third contact;
when the second voltage detection signal of the second detection end is smaller than the second threshold voltage, the controller outputs a third control signal through the first output end to control the disconnection of the second contact and the common contact, control the connection of the first contact and the common contact, and outputs a fourth control signal through the second output end to control the connection of the fourth contact and the third contact.
Optionally, the ac-dc switching power supply circuit further includes a controller, and the controller includes a first detection end, a second detection end, and an output end; the first switch comprises a control end; the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, and the output end is electrically connected with the control end of the first change-over switch; the first change-over switch and the second change-over switch are mechanical linkage switches;
when the input end of the alternating current power supply is controlled to be conducted with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third end to conduct with the first end, controlling the fourth end to conduct with the second end, including:
when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the output end to control the disconnection of the first contact and the common contact, and the second contact is connected with the common contact;
when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, the controller outputs a second control signal through the output end to control the connection between the first contact and the common contact, and the second contact is disconnected with the common contact;
when the first contact is connected with the common contact, the third contact is disconnected with the fourth contact; when the second contact is connected with the common contact, the third contact is connected with the fourth contact.
In a third aspect, an embodiment of the present invention further provides an ac/dc power supply circuit breaker, including any one of the ac/dc switching power supply circuits in the first aspect.
The alternating current-direct current switching power supply circuit provided by the embodiment of the invention is characterized in that the input end of an alternating current power supply and the input end of a direct current power supply are connected into the same switching circuit. When the switching circuit is used for controlling the input end of the alternating current power supply to be connected with the first end of the power supply switch, the arc extinguishing circuit is controlled to be disconnected with the second end (connected with the power supply output end) of the power supply switch, so that when the input end of the alternating current power supply is connected with the power supply switch, the direct current power supply can be disconnected with the power supply output end, and alternating current power supply is realized when the power supply switch is closed; and when the third end of the control arc extinguishing circuit is conducted with the first end of the power supply switch, the fourth end of the control arc extinguishing loop is conducted with the second end of the power supply switch, so that the direct-current power supply can be conducted with the power output end, and direct-current power supply is realized when the power supply switch is closed. The problem of current need set up control circuit alone when providing interchange, DC power supply to the load, set up two direct current and AC power supply's circuit and the loaded down with trivial details nature of circuit and the low efficiency of power supply that brings alone promptly is solved, realized only providing convenient switching when exchanging and DC power supply to the load through a switching circuit, improved the power supply efficiency to the load and the reliability of power supply.
Drawings
Fig. 1 is a schematic structural diagram of an ac/dc switching power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention;
fig. 5 is a flowchart of an ac/dc switching power supply method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
All the alternating current/direct current switching power supply circuits, the alternating current/direct current switching methods and the alternating current/direct current power supply circuit breakers provided in the embodiments of the present invention described below can be applied to a situation where two power supplies, namely an alternating current power supply and a direct current power supply, are switched arbitrarily according to actual needs for power supply equipment.
Fig. 1 is a schematic structural diagram of an ac/dc switching power supply circuit according to an embodiment of the present invention, and as shown in fig. 1, the ac/dc switching power supply circuit includes: the switching circuit 10, the power supply switch K, the arc extinguishing circuit 20, an alternating current power supply input end A, a direct current power supply input end B and a power supply output end C, wherein the power supply output end C is used for connecting a load;
the power supply switch K comprises a first terminal q1 and a second terminal q2, and the second terminal q2 is electrically connected with the power supply output terminal C;
the arc extinguishing circuit 20 comprises a third terminal q3 and a fourth terminal q4, wherein the third terminal q3 is electrically connected with the direct current power input terminal B;
the switching circuit 10 is electrically connected to the ac power input terminal a, the first terminal q1, the second terminal q2, the third terminal q3 and the fourth terminal q4, respectively, and is configured to control a conduction state between the ac power input terminal a and the first terminal q1, a conduction state between the third terminal q3 and the first terminal q1, and a conduction state between the fourth terminal q4 and the second terminal q 2; when the input end A of the alternating current power supply is controlled to be conducted with the first end q1, the disconnection between the fourth end q4 and the second end q2 is controlled; and controlling the fourth terminal q4 to be conducted with the second terminal q2 when the third terminal q3 is controlled to be conducted with the first terminal q 1.
Specifically, the ac power input terminal a is used for inputting an ac power to the ac/dc switching power supply circuit, and the dc power input terminal B is used for inputting a dc power to the ac/dc switching power supply circuit.
When the ac power supply needs to be supplied to the load or the load cannot be supplied through the dc power input terminal B, the power supply switch K is closed, the switching circuit 10 itself controls the connection between the ac power input terminal a and the first terminal q1 of the power supply switch K, the connection between the third terminal q3 of the arc extinguishing circuit 20 and the first terminal q1 of the power supply switch K, and the connection between the fourth terminal q4 of the arc extinguishing circuit 20 and the second terminal q2 of the power supply switch K, or the switching circuit 10 is manually operated to connect the ac power input terminal a and the first terminal q1 of the power supply switch K, the connection between the third terminal q3 of the arc extinguishing circuit 20 and the first terminal q1 of the power supply switch K, and the connection between the fourth terminal q4 of the arc extinguishing circuit 20 and the second terminal q2 of the power supply switch K. Therefore, a passage is formed among the input end A of the alternating current power supply, the power supply switch K and the power output end C, and the alternating current power supply provides the alternating current power supply for the load through the input end A of the alternating current power supply and the power output end C.
When the direct current power supply needs to be provided for the load or the load cannot be supplied through the alternating current power supply input end a, the power supply switch K is closed, the switching circuit 10 controls disconnection between the alternating current power supply input end a and the first end q1 of the power supply switch K, conduction between the third end q3 of the arc extinguishing circuit 20 and the first end q1 of the power supply switch K, and conduction between the fourth end q4 of the arc extinguishing circuit 20 and the second end q2 of the power supply switch K, or the switching circuit 10 is manually operated, so that disconnection between the alternating current power supply input end a and the first end q1 of the power supply switch K, conduction between the third end q3 of the arc extinguishing circuit 20 and the first end q1 of the power supply switch K, and conduction between the fourth end q4 of the arc extinguishing circuit 20 and the second end q2 of the power supply switch K. Therefore, a passage is formed among the direct current power supply input end B, the power supply switch K and the power supply output end C, and the direct current power supply provides an alternating current power supply for the load through the direct current power supply input end B and the power supply output end C.
The power supply switch K can be a vacuum switch, and the control mode of the power supply switch K can be a remote control mode or a manual operation control mode. When the switching circuit 10 controls the power supply switch K to be connected or disconnected with the ac input terminal or the dc input terminal, an arc effect is generated in the path where the dc power input terminal B is located, thereby affecting the power supply of the dc power to the load, and the arc extinguishing circuit 20 is configured to eliminate the arc effect, thereby ensuring the reliability of the power supply of the dc power to the load. Optionally, the arc extinguishing circuit 20 includes an absorption circuit 21 and a coupling negative voltage circuit 22; the absorption circuit 21 and the coupling negative voltage circuit 22 are connected in parallel.
The alternating current-direct current switching power supply circuit provided by the embodiment of the invention is characterized in that the input end of an alternating current power supply and the input end of a direct current power supply are connected into the same switching circuit. When the switching circuit controls the input end of the alternating current power supply to be connected with the first end of the power supply switch, the arc extinguishing circuit is controlled to be disconnected with the second end of the power supply switch, so that when the input end of the alternating current power supply is connected with the power supply switch, the direct current power supply is disconnected with the output end of the power supply, and alternating current power supply is realized when the power supply switch is closed; and when the third end of the arc extinguishing circuit is controlled to be conducted with the first end of the power supply switch, the fourth end of the arc extinguishing loop is controlled to be conducted with the second end of the power supply switch, so that the direct-current power supply is conducted with the power output end, and the direct-current power supply is realized when the power supply switch is closed. Therefore, convenient switching when alternating current and direct current power supplies are provided for the load through only one switching circuit is achieved, and power supply efficiency and power supply reliability of the load are improved.
With continued reference to fig. 1, optionally, the switching circuit 10 includes a first switch K1 and a second switch K2;
the first change-over switch K1 comprises a first contact t1, a second contact t2 and a common contact t, and the second change-over switch K2 comprises a third contact t3 and a fourth contact t 4;
the first contact t1 is electrically connected with the alternating current power input end A, the second contact t2 is electrically connected with the third end q3 of the arc extinguishing circuit 20, and the common contact t is electrically connected with the first end q1 of the power supply switch; the third contact t3 is electrically connected to the fourth end q4 of the quenching circuit 20, and the fourth contact t4 is connected to the second end q2 of the supply switch.
Specifically, when an ac power supply needs to be provided to the load or the load cannot be supplied through the dc power input terminal B, the power supply switch is closed, so that the first contact t1 of the first switch K1 and the common contact t of the first switch K1 can be controlled to be turned on, the second contact t2 of the first switch K1 and the common contact t of the first switch K1 are controlled to be turned off, and the third contact t3 of the second switch K2 and the fourth contact t4 are controlled to be turned off, so that a path is formed among the ac power input terminal a, the power supply switch and the power output terminal C, and the ac power supply provides an ac power supply to the load through the ac power input terminal a and the power output terminal C.
When direct current power supply needs to be provided for a load or the load cannot be supplied through the alternating current power supply input end A, the power supply switch is closed, the second contact t2 of the first change-over switch K1 can be controlled to be connected with the common contact t of the first change-over switch K1, the first contact t1 of the first change-over switch K1 is controlled to be disconnected with the common contact t of the first change-over switch K1, and the third contact t3 of the second change-over switch K2 is controlled to be connected with the fourth contact t 4. Therefore, a path is formed among the direct current power supply input end B, the power supply switch and the power supply output end C, the direct current power supply provides alternating current power supply for the load through the direct current power supply input end B and the power supply output end C, meanwhile, the arc extinguishing circuit 20 is also switched on in the path, the arc effect when the power supply switch is switched on or switched off is eliminated, and the reliability of supplying power to the load by the direct current power supply is ensured.
Wherein, the first switch K1 and the second switch K2 may be mechanical switches, for example, the first switch K1 may be an automatic transfer switch including two contacts. In addition, the first switch K1 and the second switch K2 may be controlled in a remote control manner, or the first switch K1 and the second switch K2 may be controlled in a manual operation manner, or when any one of the ac power input/output terminal and the dc power input terminal B fails to supply power to the load normally, the first switch K1 and the second switch K2 automatically operate, so that automatic switching between the ac power input terminal a and the dc power input terminal B is realized to ensure that the load is not powered off.
Fig. 2 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention, and as shown in fig. 2, optionally, the first switch K1 and the second switch K2 are mechanical ganged switches.
Specifically, the first switch K1 and the second switch K2 may be linked, so that when only one of the first switch K1 or the second switch K2 is controlled, the other is linked therewith, thereby further simplifying the control of the ac/dc switching power supply circuit, reducing the time delay caused by asynchronism when the two switches are separately and independently controlled, and further improving the power supply efficiency. Specifically, the linkage between the first switch K1 and the second switch K2 may be realized by a control program inside the circuit, or may be realized by mechanically and electrically connecting the two switches inside the circuit.
Fig. 3 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention, as shown in fig. 3, optionally, the ac/dc switching power supply circuit further includes a controller 30, and the controller 30 includes a first detecting terminal m1, a second detecting terminal m2, a first output terminal r1, and a second output terminal r 2; the first change-over switch K1 and the second change-over switch K2 both comprise control ends;
the first detection end m1 is electrically connected with the first contact t1, the first output end r1 is electrically connected with the control end of the first switch K1, the second detection end m2 is electrically connected with the second contact t2, and the second output end r2 is electrically connected with the control end of the second switch K2.
The controller 30 is configured to output a first control signal through the first output terminal r1 to control the first contact t1 to be disconnected from the common contact t and to control the second contact t2 to be connected to the common contact t when the first voltage detection signal at the first detection terminal m1 is smaller than a first threshold voltage; and a second control signal is output through the second output terminal r2 to control the fourth contact t4 to be connected with the third contact t 3;
the controller 30 is further configured to output a third control signal through the first output terminal r1 to control the second contact t2 to be disconnected from the common contact t, control the first contact t1 to be connected to the common contact t, and output a fourth control signal through the second output terminal r2 to control the fourth contact t4 to be disconnected from the third contact t3 when the second voltage detection signal at the second detection terminal m2 is smaller than the second threshold voltage.
Specifically, with continued reference to fig. 2, in the case where the first changeover switch K1 and the second changeover switch K2 are not set in linkage. When the controller 30 detects that the first voltage detection signal at the first contact t1 of the first switch K1 is smaller than the first threshold voltage through the first detection terminal m1, indicating that the ac power input terminal a cannot normally provide ac power to the load at this time, the controller 30 outputs a first control signal through the first output terminal r1 to control the first contact t1 to be disconnected from the common contact t, controls the second contact t2 to be connected to the common contact t, and outputs a second control signal through the second output terminal r2 to control the fourth contact t4 of the second switch K2 to be connected to the third contact t3, so as to provide dc power to the load through the dc power input terminal B, thereby ensuring that the load is not powered.
When the controller 30 detects that the second voltage signal at the second contact t2 of the first switch K1 is smaller than the second threshold voltage through the second detection terminal m2, indicating that the dc power input terminal B cannot normally provide the dc power to the load at this time, the controller 30 outputs the third control signal through the first output terminal r1 to control the disconnection between the second contact t2 and the common contact t, to control the connection between the first contact t1 and the common contact t, and outputs the fourth control signal through the second output terminal r2 to control the disconnection between the fourth contact t4 and the third contact t3 of the second switch K2, so as to provide the dc power to the load through the ac power input terminal a, thereby ensuring that the load is not powered.
The first threshold voltage and the second threshold voltage may be preset in the controller 30, for example, the first threshold voltage or the second threshold voltage may be set to be zero volts or close to zero volts, which indicates that there is almost no voltage at the first contact t1 or the second contact t2 of the first switch K1 and the load cannot be normally supplied. The first control signal, the second control signal, the third control signal and the fourth control signal may be serial command control signals or active high and low level signals.
According to the alternating current-direct current switching circuit provided by the embodiment of the invention, on the basis of conveniently switching the alternating current power supply input end and the direct current power supply input end in the same circuit by the first switching switch and the second switching switch, the controller is arranged, the controller detects the voltages at the first contact and the second contact of the first switching switch, and outputs corresponding control signals in time according to the detection result to control the first switching switch and the second switching switch, so that the flexible switching between the alternating current power supply input end and the direct current input end is efficiently controlled, and the power supply effect of efficiently and reliably controlling a load and supplying power without power failure is ensured.
Fig. 4 is a schematic structural diagram of another ac/dc switching power supply circuit according to an embodiment of the present invention, as shown in fig. 4, optionally, the ac/dc switching power supply circuit further includes a controller 30, and the controller 30 includes a first detection terminal m1, a second detection terminal m2, and an output terminal r; the first switch K1 includes a control terminal;
the first detection end m1 is electrically connected with the first contact t1, the second detection end m2 is electrically connected with the second contact t2, the output end r is electrically connected with the control end of the first switch K1, the controller 30 is configured to output a first control signal through the output end r to control the disconnection of the first contact t1 and the common contact t when a first voltage detection signal of the first detection end m1 is smaller than a first threshold voltage, and the second contact t2 is connected with the common contact t;
the controller 30 is further configured to output a second control signal through the output terminal r to control the connection of the first contact t1 and the common contact t when the second voltage detection signal at the second detection terminal m2 is smaller than the second threshold voltage, and the second contact t2 is disconnected from the common contact t;
when the first contact t1 is connected with the common contact t, the third contact t3 is disconnected with the fourth contact t 4; when the second contact t2 is connected to the common contact t, the third contact t3 is connected to the fourth contact t 4.
Specifically, with continued reference to fig. 3, in the case where there is an interlocking arrangement of the first changeover switch K1 and the second changeover switch K2. After the controller 30 detects the voltage at the first contact t1 or the second contact t2 of the first switch K1 through the first detection end m1 or the second detection end m2, the controller can output a corresponding first control signal or second control signal through only one output end r to control the switching of a loop where the alternating current power supply input end a is located and a path where the direct current power supply input end B is located, so that the problem of possible asynchronization during independent control is reduced while the load is not powered off, the switching speed is increased, and the power is efficiently supplied.
Based on the technical scheme of the alternating current-direct current switching power supply circuit, the embodiment of the invention also provides the alternating current-direct current power supply circuit breaker, which comprises any one of the alternating current-direct current switching power supply circuits in any one of the technical schemes, so that the technical effect same as that of the corresponding alternating current-direct current switching power supply circuit can be realized, the convenient switching of the alternating current power supply and the direct current power supply through only one switching circuit is realized, and the power supply efficiency of a load and the power supply reliability are improved. The circuit breaker with the switching function provided by the embodiment of the invention can realize switching power supply of the alternating current power supply and the direct current power supply to the power supply equipment by only one circuit breaker, and is simple, convenient and reliable, high in power supply efficiency and low in cost.
An embodiment of the present invention further provides an ac/dc switching power supply method, which is applied to the ac/dc switching power supply circuit provided in any of the above embodiments, fig. 5 is a flowchart of the ac/dc switching power supply method provided in the embodiment of the present invention, and as shown in fig. 5, the ac/dc switching power supply method includes:
s100, when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and controlling the fourth end to be conducted with the second end when controlling the third end to be conducted with the first end.
Specifically, referring to fig. 1, when the ac power needs to be supplied to the load or the load cannot be supplied through the dc power input terminal B, the power supply switch is closed, and the connection between the ac power input terminal a and the first terminal q1 of the power supply switch K, the connection between the third terminal q3 of the arc-extinguishing circuit 20 and the first terminal q1 of the power supply switch K, and the connection between the fourth terminal q4 of the arc-extinguishing circuit 20 and the second terminal q2 of the power supply switch K are controlled. Therefore, a channel is formed among the input end A of the alternating current power supply, the power supply switch K and the power output end C, and the alternating current power supply provides the alternating current power supply for the load through the input end K of the alternating current power supply and the power output end C.
When direct current power supply needs to be provided for a load or the load cannot be supplied through the alternating current power supply input end A, the power supply switch K is closed, and disconnection between the alternating current power supply input end A and the first end q1 of the power supply switch K, conduction between the third end q3 of the arc extinguishing circuit 20 and the first end q1 of the power supply switch K, and conduction between the fourth end q4 of the arc extinguishing circuit 20 and the second end q2 of the power supply switch K are controlled. Therefore, a passage is formed among the direct current power supply input end B, the power supply switch K and the power supply output end C, and the direct current power supply provides an alternating current power supply for the load through the direct current power supply input end B and the power supply output end C.
Referring to fig. 3, optionally, the ac/dc switching power supply circuit further includes a controller 30, and the controller 30 includes a first detecting terminal m1, a second detecting terminal m2, a first output terminal r1 and a second output terminal r 2; the first change-over switch K1 and the second change-over switch K2 both comprise control ends; the first detection end m1 is electrically connected with the first contact t1, the first output end r1 is electrically connected with the control end of the first change-over switch K1, the second detection end m2 is electrically connected with the second contact t2, and the second output end r2 is electrically connected with the control end of the second change-over switch K2;
when the input end of the alternating current power supply is controlled to be conducted with the first end q1, the fourth end q4 is controlled to be disconnected with the second end q 2; and when the third terminal q3 is controlled to be conducted with the first terminal q1, the fourth terminal q4 is controlled to be conducted with the second terminal q2, including:
when the first voltage detection signal at the first detection terminal m1 is smaller than the first threshold voltage, the controller 30 outputs a first control signal through the first output terminal r1 to control the disconnection of the first contact t1 from the common contact t and control the connection of the second contact t2 with the common contact t; and a second control signal is output through the second output terminal r2 to control the fourth contact t4 to be connected with the third contact t 3;
the controller 30 outputs a third control signal through the first output terminal r1 to control the disconnection of the second contact t2 from the common contact t, to control the connection of the first contact t1 to the common contact t, and outputs a fourth control signal through the second output terminal r2 to control the connection of the fourth contact t4 to the third contact t3 when the second voltage detection signal at the second detection terminal m2 is less than the second threshold voltage.
Referring to fig. 4, optionally, the ac/dc switching power supply circuit further includes a controller 30, where the controller 30 includes a first detecting terminal m1, a second detecting terminal m2, and an output terminal r; the first switch K1 includes a control terminal; the first detection end m1 is electrically connected with the first contact t1, the second detection end m2 is electrically connected with the second contact t2, and the output end r is electrically connected with the control end of the first switch K1; the first change-over switch K1 and the second change-over switch K2 are mechanical linkage switches;
when the input end of the alternating current power supply is controlled to be conducted with the first end q1, the fourth end q4 is controlled to be disconnected with the second end q 2; and when the third terminal q3 is controlled to be conducted with the first terminal q1, the fourth terminal q4 is controlled to be conducted with the second terminal q2, including:
when the first voltage detection signal at the first detection terminal m1 is smaller than the first threshold voltage, the controller 30 outputs a first control signal through the output terminal r to control the disconnection of the first contact t1 and the common contact t, and the second contact t2 is connected with the common contact t;
when the second voltage detection signal at the second detection terminal m2 is smaller than the second threshold voltage, the controller 30 outputs r a second control signal through the output terminal to control the connection of the first contact t1 and the common contact t, and the second contact t2 is disconnected from the common contact t;
when the first contact t1 is connected with the common contact t, the third contact t3 is disconnected with the fourth contact t 4; when the second contact t2 is connected to the common contact t, the third contact t3 is connected to the fourth contact t 4.
In summary, the ac/dc switching power supply method provided by the embodiment of the present invention is applied to any ac/dc switching power supply circuit in the above embodiments, can achieve the same technical effect as the ac/dc switching power supply circuit, solves the problem of circuit complexity and power supply inefficiency caused by separately setting a control circuit when the ac and dc power supplies are provided to the load in the prior art, that is, separately setting two circuits of the dc and ac power supplies, achieves convenient switching when the ac and dc power supplies are provided to the load through only one circuit, and improves power supply efficiency and power supply reliability of the load.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An AC/DC switching power supply circuit, comprising: the arc extinguishing device comprises a switching circuit, a power supply switch, an arc extinguishing circuit, an alternating current power supply input end, a direct current power supply input end and a power supply output end, wherein the power supply output end is used for being connected with a load;
the power supply switch comprises a first end and a second end, and the second end is electrically connected with the power supply output end;
the arc extinguishing circuit comprises a third end and a fourth end, and the third end is electrically connected with the input end of the direct current power supply;
the switching circuit is electrically connected with the alternating current power supply input end, the first end, the second end, the third end and the fourth end respectively, and is used for controlling the conduction state between the alternating current power supply input end and the first end, the conduction state between the third end and the first end and the conduction state between the fourth end and the second end; when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when the third end is controlled to be conducted with the first end, the fourth end is controlled to be conducted with the second end.
2. The ac-dc switched-supply circuit according to claim 1, wherein the switching circuit comprises a first switch and a second switch;
the first change-over switch comprises a first contact, a second contact and a common contact, and the second change-over switch comprises a third contact and a fourth contact;
the first contact is electrically connected with the input end of the alternating current power supply, the second contact is electrically connected with the third end of the arc extinguishing circuit, and the common contact is electrically connected with the first end of the power supply switch; the third contact is electrically connected with the fourth end of the arc extinguishing circuit, and the fourth contact is connected with the second end of the power supply switch.
3. The ac-dc switching power supply circuit according to claim 2, wherein the first switch and the second switch are mechanical ganged switches.
4. The ac-dc switching power supply circuit according to claim 2, further comprising a controller, wherein the controller comprises a first detection terminal, a second detection terminal, a first output terminal, and a second output terminal; the first change-over switch and the second change-over switch comprise control ends;
the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch.
The controller is used for outputting a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage; and outputting a second control signal through the second output terminal to control the fourth contact to be connected with the third contact;
the controller is further configured to output a third control signal through the first output terminal to control the second contact to be disconnected from the common contact, control the first contact to be connected to the common contact, and output a fourth control signal through the second output terminal to control the fourth contact to be disconnected from the third contact when a second voltage detection signal of the second detection terminal is smaller than a second threshold voltage.
5. The AC-DC switching power supply circuit according to claim 3, further comprising a controller, wherein the controller comprises a first detection terminal, a second detection terminal and an output terminal; the first switch comprises a control end;
the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, the output end is electrically connected with the control end of the first change-over switch, the controller is used for outputting a first control signal through the output end to control the disconnection of the first contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, and the second contact is connected with the common contact;
the controller is further configured to output a second control signal through the output terminal to control connection between the first contact and the common contact when a second voltage detection signal of the second detection terminal is smaller than a second threshold voltage, and the second contact is disconnected from the common contact;
wherein the third contact is disconnected from the fourth contact when the first contact is connected to the common contact; and when the second contact is connected with the common contact, the third contact is connected with the fourth contact.
6. The switched supply circuit of claim 1, wherein the arc quenching circuit comprises an absorption circuit and a coupled negative circuit; the absorption circuit and the coupling negative voltage circuit are connected in parallel.
7. An ac/dc switching power supply method applied to the ac/dc switching power supply circuit according to any one of claims 1 to 6, the ac/dc switching power supply method comprising:
when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when the third end is controlled to be conducted with the first end, the fourth end is controlled to be conducted with the second end.
8. The ac-dc switching power supply method according to claim 7, wherein the ac-dc switching power supply circuit further comprises a controller, the controller comprising a first detection terminal, a second detection terminal, a first output terminal, and a second output terminal; the first change-over switch and the second change-over switch comprise control ends; the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch;
when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third terminal to be conducted with the first terminal, controlling the fourth terminal to be conducted with the second terminal, including:
when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact; and outputting a second control signal through the second output terminal to control the fourth contact to be connected with the third contact;
when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, the controller outputs a third control signal through the first output end to control the disconnection of the second contact and the common contact, control the connection of the first contact and the common contact, and outputs a fourth control signal through the second output end to control the connection of the fourth contact and the third contact.
9. The ac-dc switching power supply method according to claim 7, wherein the ac-dc switching power supply circuit further comprises a controller, the controller comprising a first detection terminal, a second detection terminal, and an output terminal; the first switch comprises a control end; the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, and the output end is electrically connected with the control end of the first change-over switch; the first change-over switch and the second change-over switch are mechanical linkage switches;
when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third terminal to be conducted with the first terminal, controlling the fourth terminal to be conducted with the second terminal, including:
when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the output end to control the disconnection of the first contact and the common contact, and the second contact is connected with the common contact;
when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, the controller outputs a second control signal through the output end to control the connection between the first contact and the common contact, and the second contact is disconnected with the common contact;
wherein the third contact is disconnected from the fourth contact when the first contact is connected to the common contact; and when the second contact is connected with the common contact, the third contact is connected with the fourth contact.
10. A circuit breaker for AC/DC power supply, comprising a circuit for AC/DC switched power supply according to any one of claims 1 to 6.
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| CN202010362390.2A CN111525675A (en) | 2020-04-30 | 2020-04-30 | Alternating current-direct current switching power supply circuit and method and circuit breaker |
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| CN202010362390.2A CN111525675A (en) | 2020-04-30 | 2020-04-30 | Alternating current-direct current switching power supply circuit and method and circuit breaker |
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| CN111525675A true CN111525675A (en) | 2020-08-11 |
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Application publication date: 20200811 |