CN114243886A - Alternating current input redundancy control device - Google Patents
Alternating current input redundancy control device Download PDFInfo
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- CN114243886A CN114243886A CN202111573581.4A CN202111573581A CN114243886A CN 114243886 A CN114243886 A CN 114243886A CN 202111573581 A CN202111573581 A CN 202111573581A CN 114243886 A CN114243886 A CN 114243886A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
Abstract
The application discloses redundant controlling means of alternating current input includes: the power supply system comprises a main alternating current power supply unit, an auxiliary alternating current power supply unit, a first power supply conversion unit, a second power supply conversion unit, a first switch unit, a second switch unit and an electricity load unit, wherein when the main alternating current power supply unit normally works, the first power supply conversion unit provides direct current for the first switch unit, so that the direct current output by the second power supply conversion unit cannot supply power for the second switch unit, and when no power supply is input into the second switch unit, the alternating current output end of the main alternating current power supply unit can be connected with the alternating current input end of the electricity load through the second switch unit; when the main alternating current power supply unit works abnormally, the first switch unit does not have power supply input, so that direct current output by the second power supply conversion unit flows into the second switch unit, and at the moment, the alternating current output end of the auxiliary alternating current power supply unit can be connected with the alternating current input end of the power load through the second switch unit, and therefore redundant control of alternating current input is achieved.
Description
Technical Field
The application relates to the technical field of power supply, in particular to an alternating current input redundancy control device.
Background
At present, various power equipment is applied to production and life of people, and great convenience is provided for people. The power equipment can be powered by the AC power supply without switching on the AC power supply, but in the process of supplying power to the power equipment by the AC power supply, because only one path of AC power supply is adopted to supply power to the power equipment, the power equipment is possibly abnormally supplied due to the fault of the path of AC power supply, so that the power equipment cannot normally operate. Therefore, how to realize the alternating current input redundancy control is a problem which is always concerned.
Disclosure of Invention
In view of the above, the present application provides an ac power input redundancy control apparatus, so as to implement redundancy control of ac power input.
In order to achieve the above object, the following solutions are proposed:
an alternating current input redundancy control apparatus comprising: the power supply system comprises a main alternating current power supply unit, an auxiliary alternating current power supply unit, a first power supply conversion unit, a second power supply conversion unit, a first switch unit, a second switch unit and a power load unit;
the live wire input end of the first power supply conversion unit is respectively connected with the live wire output end of the main alternating current power supply unit and the interface 3 of the second switch unit, the zero line input end of the first power supply conversion unit is respectively connected with the zero line output end of the main alternating current power supply unit and the interface 4 of the second switch unit, and the direct current output end of the first power supply conversion unit is connected with the first switch unit;
the live wire input end of the second power supply conversion unit is respectively connected with the live wire output end of the auxiliary alternating current power supply unit and an interface 7 of the second switch unit, the zero line input end of the second power supply conversion unit is respectively connected with the zero line output end of the auxiliary alternating current power supply unit and an interface 8 of the second switch unit, the first direct current output end of the second power supply conversion unit is connected with the interface 3 of the first switch unit, and the second direct current output end of the second power supply conversion unit is connected with the interface 1 of the second switch unit;
an interface 1 of the second switch unit is connected with an interface 4 of the first switch unit, an interface 5 of the second switch unit is connected with a live wire input end of the electric load unit, and an interface 6 of the second switch unit is connected with a zero line input end of the electric load unit;
in the first switch unit, the interface 1 and the interface 2 are power input ports of the first switch unit, and when the interface 1 and the interface 2 have power input, the connection relation between the interface 3 and the interface 4 is changed from connection to disconnection;
in the second switch unit, the interface 1 and the interface 2 are power input ports of the second switch unit, when the interface 1 and the interface 2 have power input, the connection relationship of the interface 3 and the interface 5, and the connection relationship of the interface 4 and the interface 6 are changed from disconnection to connection, and simultaneously the connection relationship of the interface 5 and the interface 7, and the connection relationship of the interface 6 and the interface 8 are changed from connection to disconnection.
Optionally, the first switch unit and/or the second switch unit includes a relay circuit therein.
Optionally, the first power conversion unit and/or the second power conversion unit include a switching power supply circuit.
Optionally, the ac input redundancy control apparatus further includes: a fuse tube;
the protective tube is connected between the live wire output end of the auxiliary alternating current power supply unit and the live wire input end of the second power supply conversion unit.
Optionally, the ac input redundancy control apparatus further includes: a resistance;
one end of the resistor is connected with the first direct current output end of the second power supply conversion unit;
the other end of the resistor is connected with a second direct current output end of the second power supply conversion unit.
Optionally, the ac input redundancy control apparatus further includes: a voltage regulator diode;
the cathode of the voltage stabilizing diode is connected with the first direct current output end of the second power supply conversion unit;
and the anode of the voltage stabilizing diode is connected with the second direct current output end of the second power supply conversion unit.
Optionally, the ac input redundancy control apparatus further includes: a voltage dependent resistor;
one end of the piezoresistor is connected with the live wire input end of the second power supply conversion unit;
and the other end of the piezoresistor is connected with the zero line input end of the second power supply conversion unit.
Optionally, the ac input redundancy control apparatus further includes: a thermistor;
and the thermistor is connected between the live wire output end of the auxiliary alternating current power supply unit and the live wire input end of the second power supply conversion unit.
Optionally, the ac input redundancy control apparatus further includes: a first failure prompt unit;
the first fault prompting unit is connected with the main alternating current power supply unit;
when the main alternating current power supply unit breaks down, the first fault prompting unit can give a prompt.
Optionally, the ac input redundancy control apparatus further includes: a second failure indication unit;
the second fault prompting unit is connected with the auxiliary alternating current power supply unit;
when the auxiliary alternating current power supply unit breaks down, the second fault prompting unit can give a prompt.
It can be seen from the above technical solutions that, according to the ac input redundancy control apparatus provided in the embodiment of the present application, when the main ac power supply unit supplies power normally, ac power can be output from the zero line output terminal and the live line output terminal of the main ac power supply unit, and flows into the first power conversion unit, and the first conversion unit converts ac power into dc power, and inputs the dc power into the first switch unit, so that the connection relationship between the interface 3 and the interface 4 of the first switch unit is changed from connection to disconnection, at this time, the first dc output terminal of the second power conversion unit cannot be connected to the interface 2 of the second switch unit, so that dc power output from the second power conversion unit cannot flow into the second switch unit, because when no current flows into the interface 1 and the interface 2 of the second switch unit, the connection relationship between the interface 3 and the interface 5 and the connection relationship between the interface 4 and the interface 6 are both connected, the connection relation of the interface 7 and the interface 5 and the connection relation of the interface 8 and the interface 6 are disconnected, so that alternating current output by the main alternating current power supply unit can be transmitted to the power utilization load unit through the second switch unit to supply power to the load, and therefore the power utilization load is supplied with power by the main alternating current power supply unit when the power supply of the main alternating current power supply unit is normal.
When the power supply of the main alternating current power supply unit is abnormal, the zero line output end and the live line output end of the main alternating current power supply unit can not output alternating current, so that the first conversion unit can not output direct current, at the moment, no current flows through the interface 1 and the interface 2 of the first switch unit, the connection relation of the interface 3 and the interface 4 of the first switch unit is changed from disconnection to connection, the alternating current output by the auxiliary alternating current power supply unit is converted into direct current by the second power supply conversion unit, when the interface 3 and the interface 4 of the first switch unit are connected, the direct current output by the second power supply conversion unit flows into the second switch unit through the interface 1 and the interface 2 of the second switch unit, the connection relation of the interface 3 and the interface 5 and the connection relation of the interface 4 and the interface 6 are both disconnected, and the connection relation of the interface 7 and the interface 5 and the connection relation of the interface 8 and the interface 6 are both connected, therefore, alternating current output by the auxiliary alternating current power supply unit can be transmitted to the power load unit through the second switch unit to supply power to the load, so that when the power supply of the main alternating current power supply unit is abnormal, the auxiliary alternating current power supply unit supplies power to the power load, and the redundant control of alternating current input is completed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ac input redundancy control apparatus according to an embodiment of the present disclosure.
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.
Fig. 1 is a schematic structural diagram of an ac input redundancy control apparatus according to an embodiment of the present application, where the apparatus may include: the power supply system comprises a main alternating current power supply unit 10, an auxiliary alternating current power supply unit 20, a first power supply conversion unit 30, a second power supply conversion unit 40, a first switch unit 50, a second switch unit 60 and a power load unit 70.
In the device, a live wire input end L of the first power conversion unit 30 is connected to a live wire output end L of the main ac power supply unit 10 and the interface 3 of the second switch unit 60, respectively. The zero line input end N of the first power conversion unit 30 is connected to the zero line output end N of the main ac power supply unit 10 and the interface 4 of the second switch unit 60, respectively. The dc output terminal of the first power conversion unit 30 is connected to the first switching unit 50.
Specifically, through the connection relationship, the main ac power supply unit 10 may transmit ac power to the first power conversion unit 30, and the first power conversion unit 30 may convert the ac power into dc power required by the first switching unit 50 and transmit the dc power to the first switching unit 50. The dc output terminals of the first power conversion unit 30 may include a first dc output terminal V1 and a second dc output terminal V2, the first dc output terminal V1 of the first power conversion unit 30 may be connected to the interface 1 of the first switch unit 50, and the second dc output terminal V2 of the first power conversion unit 30 may be connected to the interface 2 of the first switch unit 50.
One of the first dc output terminal V1 and the second dc output terminal V2 of the first power conversion unit 30 is positive and the other is negative, when the first dc output terminal V1 of the first power conversion unit 30 is connected to the interface 1 of the first switch unit 50, if the first dc output terminal V1 of the first power conversion unit 30 is positive, the interface 1 of the first switch unit 50 is also positive, and the second dc output terminal V2 of the first power conversion unit 30 and the interface 2 of the first switch unit 50 are negative.
In the device, a live line input end L of the second power conversion unit 40 is connected to a live line output end L of the auxiliary ac power supply unit 20 and an interface 7 of the second switch unit 60, a null line input end N of the second power conversion unit 40 is connected to a null line output end N of the auxiliary ac power supply unit 20 and an interface 8 of the second switch unit 60, respectively, a first dc output end V1 of the second power conversion unit 40 is connected to an interface 3 of the first switch unit 50, and a second dc output end V2 of the second power conversion unit 40 is connected to an interface 1 of the second switch unit 60.
Specifically, through the above connection relationship, the auxiliary ac power supply unit 20 may transmit ac power to the second power conversion unit 40, and the second power conversion unit 40 may convert the ac power into dc power required by the second switching unit 60. One of the first dc output terminal V1 and the second dc output terminal V2 of the second power conversion unit 40 is positive, and the other is negative, when the second dc output terminal V2 of the second power conversion unit 40 is positive, the interface 1 of the second switch unit 60 connected thereto is also positive, and when the second dc output terminal V2 of the second power conversion unit 40 is negative, the interface 1 of the second switch unit 60 connected thereto is also negative.
In this device, the interface 1 of the second switch unit 60 is connected to the interface 4 of the first switch unit 50, the interface 5 of the second switch unit 60 is connected to the live input terminal L of the electrical load unit 70, and the interface 6 of the second switch unit 60 is connected to the neutral input terminal N of the electrical load unit 70.
In the device, the interface 1 and the interface 2 of the first switch unit 50 are power input ports of the first switch unit 50, and when the interface 1 and the interface 2 have power input, the connection relationship between the interface 3 and the interface 4 is changed from connection to disconnection.
Specifically, one of the interface 1 and the interface 2 of the first switching unit 50 is a positive electrode and the other is a negative electrode. The first switching unit 50 adjusts the state of the internal switch through the power input states of the interface 1 and the interface 2. When the interface 1 and the interface 2 of the first switch unit 50 have no power input, the connection relationship of the interface 3 and the interface 4 of the first switch unit 50 is kept connected; when the interface 1 and the interface 2 of the first switching unit 50 have power input, the connection relationship between the interface 3 and the interface 4 is kept disconnected.
In the device, the interface 1 and the interface 2 of the second switch unit 60 are power input ports of the second switch unit 60, and when the interface 1 and the interface 2 have power input, the connection relationship of the interface 3 and the interface 5, and the connection relationship of the interface 4 and the interface 6 of the second switch unit 60 are changed from disconnection to connection, and simultaneously the connection relationship of the interface 5 and the interface 7, and the connection relationship of the interface 6 and the interface 8 of the second switch unit 60 are changed from connection to disconnection.
Specifically, one of the interface 1 and the interface 2 of the second switch unit 60 is a positive electrode and the other is a negative electrode. The second switching unit 60 adjusts the state of the internal switch by the power input states of the interface 1 and the interface 2. When the interface 1 and the interface 2 of the second switch unit 60 have no power input, the connection relationship between the interface 3 and the interface 5 of the second switch unit 60 and the connection relationship between the interface 4 and the interface 6 are kept connected, while the connection relationship between the interface 5 and the interface 7 of the second switch unit 60 and the connection relationship between the interface 6 and the interface 8 are kept disconnected; when the interface 1 and the interface 2 of the first switch unit 50 have power input, the connection relationship of the interface 3 and the interface 5 of the second switch unit 60, and the connection relationship of the interface 4 and the interface 6 are kept disconnected, while the connection relationship of the interface 5 and the interface 7 of the second switch unit 60, and the connection relationship of the interface 6 and the interface 8 are kept connected.
In the above embodiment, an ac input redundancy control device is provided, when the main ac power supply unit 10 is supplying power normally, the zero line output terminal N and the live line output terminal L of the main ac power supply unit 10 can output ac, which flows into the first power conversion unit 30, the first conversion unit converts ac into dc, and inputs the ac into the first switch unit 50, so that the connection relationship between the interface 3 and the interface 4 of the first switch unit 50 is changed from connection to disconnection, and at this time, the first dc output terminal V1 of the second power conversion unit 40 cannot be connected with the interface 2 of the second switch unit 60, so that dc output by the second power conversion unit 40 cannot flow into the second switch unit 60, because when no current flows into the interfaces 1 and 2, the connection relationship between the interface 3 and the interface 5 and the connection relationship between the interface 4 and the interface 6 are both connected, the connection relation between the interface 7 and the interface 5 and the connection relation between the interface 8 and the interface 6 are disconnected, so that the alternating current output by the main alternating current power supply unit 10 can be transmitted to the power load unit 70 through the second switch unit 60 to supply power to the load, thereby ensuring that the power load is supplied with power by the main alternating current power supply unit 10 when the main alternating current power supply unit 10 is in normal power supply.
When the main ac power supply unit 10 is abnormally powered, the zero line output terminal N and the live line output terminal L of the main ac power supply unit 10 cannot output ac power, so that the first switching unit cannot output dc power, at this time, no current flows through the interface 1 and the interface 2 of the first switching unit 50, the connection relationship between the interface 3 and the interface 4 of the first switching unit 50 is changed from disconnection to connection, the second power conversion unit 40 converts ac power output by the auxiliary ac power supply unit 20 into dc power, when the interface 3 and the interface 4 of the first switching unit 50 are connected, the dc power output by the second power conversion unit 40 flows into the second switching unit 60 through the interface 1 and the interface 2 of the second switching unit 60, because the connection relationship between the interface 3 and the interface 5 and the connection relationship between the interface 4 and the interface 6 are disconnected when current flows into the interface 1 and the interface 2 of the second switching unit 60, the connection relation of the interface 7 and the interface 5 and the connection relation of the interface 8 and the interface 6 are both connected, so that the alternating current output by the auxiliary alternating current power supply unit 20 can be transmitted to the power utilization load unit 70 through the second switch unit 60 to supply power to the load, so that when the power supply of the main alternating current power supply unit 10 is abnormal, the auxiliary alternating current power supply unit 20 supplies power to the power utilization load, and the redundant control of the alternating current input is completed.
Currently, in circuit control, common switch circuits include a relay circuit, a thyristor circuit and a field effect transistor circuit, where the relay circuit is relatively simple and can achieve a voltage isolation effect. Based on this, in some embodiments of the present application, the relay circuit may be used in the first and second switching units 50 and 60 to implement the function of the switch.
Specifically, the first switch unit 50 may include a relay circuit, and when the first switch unit 50 is not powered on, the interface 3 and the interface 4 in the first switch unit 50 are in a normally closed state, and by supplying power to the first switch unit 50, the electromagnet in the relay is powered on, so that the interface 3 and the interface 4 of the first switch are in an off state.
The second switch unit 60 may include a relay circuit, and in a case where the second switch unit 60 is not powered, the connection state of the interface 3 and the interface 5 of the second switch unit 60, and the connection state of the interface 4 and the interface 6 are in a normally closed state, while the connection state of the interface 5 and the interface 7 of the second switch unit 60, and the connection state of the interface 6 and the interface 8 are in a normally open state; by supplying power to the second switch unit 60, the electromagnet in the relay can be energized, so that the connection state of the interface 3 and the interface 5 of the second switch unit 60, and the connection state of the interface 4 and the interface 6 are in a normally open state, while the connection state of the interface 5 and the interface 7 of the second switch unit 60, and the connection state of the interface 6 and the interface 8 are in a normally closed state.
In the above embodiment, both the first switch unit 50 and the second switch unit 60 may include the relay circuit, or only one of the first switch unit and the second switch unit may include the relay circuit, and the specific circuit may be selected according to actual requirements. The switching functions required for the first switching unit 50 and the second switching unit 60 can be realized by a relay circuit.
The first power conversion unit 30 and the second power conversion unit 40 mentioned in the foregoing embodiments each perform a function of converting alternating current into direct current. The current common circuit for converting alternating current into direct current comprises a switching power supply circuit and a linear power supply circuit, wherein the switching power supply circuit has higher efficiency and wider alternating voltage input range compared with the linear power supply circuit when the angle for converting the alternating current is analyzed. Based on this, in some embodiments of the present application, the first power conversion unit 30 and the second power conversion unit 40 may both utilize a switching power circuit to realize a function of converting alternating current into direct current.
Specifically, the first power conversion unit 30 may include a switching power circuit, and the switching power circuit converts the ac power output by the main ac power supply unit 10 to finally output the dc power required by the first switching unit 50.
The second power conversion unit 40 may include a switching power circuit, and the switching power circuit converts the ac power output by the auxiliary ac power supply unit 20 to finally output the dc power required by the second switching unit 60.
The switching power supply circuit utilizes a saturation region during a power semiconductor period to achieve the purpose of adjusting output by adjusting the turn-on time or frequency. The loss of components in the process of converting alternating current into direct current can be ignored.
In the above embodiment, the first power conversion unit 30 and the second power conversion unit 40 may both include a switching power supply circuit, or one of them may adopt a switching power supply circuit, and how to select may be selected according to actual requirements. The switching power supply circuit is used for converting alternating current into direct current, so that the power supply conversion efficiency is higher, and the loss is reduced.
In the practical application process, the circuit may cause sudden increase of circuit current due to short circuit, circuit fault and the like, and when the current exceeds the bearable range of the components in the circuit, the components may be damaged. Based on this, in some embodiments of the present application, a fuse can be added to the circuit, so as to implement overcurrent protection.
Specifically, the fuse may be connected between the live line output end L of the auxiliary ac power supply unit 20 and the live line input end L of the second power conversion unit 40. During normal operation, because the resistance of the protective tube is minimum, so only play the connection effect between the live wire output end L of assisting AC power supply unit 20 and the live wire input end L of second power supply conversion unit 40, and after the electric current that flows through the protective tube exceeded the rated value of protective tube, the protective tube can be fused, breaks off between the live wire output end L of assisting AC power supply unit 20 and the live wire input end L of second power supply conversion unit 40 this moment.
The rated current of the protective tube needs to be selected according to the actual condition of the circuit, and when the model is selected, if the rated current of the protective tube is selected too much and even exceeds the rated current of part of components in the circuit, the protective effect cannot be achieved; if the rated current of the fuse tube is too small, the normal operation of the circuit is easily influenced.
In the above embodiment, the protective tube is added in the circuit, so that the circuit can be protected, and when the circuit is over-current, other components in the circuit can be prevented from being damaged, so that only the protective tube needs to be replaced in subsequent maintenance, the circuit does not need to be checked or replaced, and the maintenance time and cost are saved.
Further, according to practical application requirements, a fuse may be connected between the live wire output end L of the main ac power supply unit 10 and the live wire input end L of the first power conversion unit 30.
After the alternating current is converted to obtain the direct current, the converted direct current voltage is higher due to reasons such as circuit design and model selection, and particularly, under the condition of no load, the converted direct current voltage may exceed a required maximum value, so that a circuit fails. Based on this, in some embodiments of the present application, a resistor may be connected in parallel to the dc output terminal to regulate the converted dc voltage.
Specifically, a resistor may be connected in parallel to the dc output terminal of the second power conversion unit 40, one end of the resistor is connected to the first dc output terminal V1 of the second power conversion unit 40, and the other end of the resistor is connected to the second dc output terminal V2 of the second power conversion unit 40. At this time, the parallel resistors are similar to the load, and the voltage can be adjusted so that the voltage output is stable.
Wherein, above-mentioned resistance needs can bear certain consumption to can satisfy circuit design's load requirement, the too big consumption that can additionally increase the circuit of resistance selection, the undersize of selecting can't realize the effect of stabilizing voltage again, so need carry out reasonable lectotype to resistance according to actual demand.
In the above embodiment, a resistor is connected in parallel to the dc output terminal of the second power conversion unit 40, so that the dc voltage can be stabilized, and the resistor can also be used as a discharge resistor to discharge the residual power after power failure.
Further, according to actual usage requirements, a resistor may be connected in parallel to the dc output terminal of the first power conversion unit 30, one end of the resistor is connected to the first dc output terminal V1 of the first power conversion unit 30, and the other end of the resistor is connected to the second dc output terminal V2 of the first power conversion unit 30.
In an actual application process, due to fluctuation of a power supply voltage or other reasons, the direct-current voltage may be unstable, so that other components are damaged. Based on this, in some embodiments of the present application, a zener diode may be connected between the dc output terminals, thereby achieving stabilization of the dc voltage.
Specifically, when the first dc output terminal V1 of the second power conversion unit 40 is positive and the second dc output terminal V2 is negative, the cathode of the zener diode may be connected to the first dc output terminal V1 of the second power conversion unit 40, and the anode of the zener diode may be connected to the second dc output terminal V2 of the second power conversion unit 40.
In addition, a current-limiting resistor may be connected in series between the cathode of the zener diode and the first dc output terminal V1 of the second power conversion unit 40 to protect the zener diode and prevent the zener diode from being damaged due to an excessive working current, and meanwhile, by selecting a proper resistance value of the current-limiting resistor, the zener diode may be prevented from entering a reverse cut-off region due to an insufficient working current and losing a voltage stabilizing effect.
The forward characteristic of the volt-ampere characteristic curve of the voltage stabilizing diode is similar to that of a common diode, and the reverse characteristic is that when the reverse voltage is lower than the reverse breakdown voltage, the reverse resistance is large, and the reverse leakage current is extremely small. However, when the reverse voltage approaches the threshold value of the reverse voltage, the reverse current increases abruptly, called breakdown, at which point the reverse resistance drops abruptly to a very small value. The voltage across the diode is substantially stabilized around the breakdown voltage despite the wide range of current variations, thereby achieving the voltage stabilization function of the diode.
In the above embodiment, by connecting a zener diode between the dc output terminals of the second power conversion unit 40, the dc voltage output by the second power conversion unit 40 can be regulated so that the voltage is in a stable state.
Further, according to practical requirements, when the first dc output terminal V1 of the first power conversion unit 30 is positive and the first dc output terminal V1 is negative, the cathode of the zener diode is connected to the first dc output terminal V1 of the first power conversion unit 30, and the anode of the zener diode is connected to the second dc output terminal V2 of the first power conversion unit 30.
In the daily use process, the circuit can generate surge voltage at the moment of electrifying, and because the surge voltage is large, components in the circuit can be damaged if the surge voltage is not inhibited. Based on this, in some embodiments of the present application, a voltage dependent resistor may be connected in parallel to the ac input terminal of the second power conversion unit 40 to suppress the surge voltage.
Specifically, a voltage dependent resistor may be added to the circuit, one end of the voltage dependent resistor may be connected to the live line input end L of the second power conversion unit 40, and the other end of the voltage dependent resistor may be connected to the zero line input end N of the second power conversion unit 40. The voltage-limiting type protection device comprises a voltage-limiting type protection device, a voltage-limiting type protection device and a voltage-limiting type protection device, wherein the voltage-limiting type protection device is used as the voltage-limiting type protection device, and when voltage appears between two poles of the voltage-limiting type protection device, the voltage-limiting type protection device can clamp the voltage to a relatively fixed voltage value through the voltage-limiting type protection device, so that protection of a post-stage circuit is achieved.
In the above embodiment, a voltage dependent resistor is connected between the live line input end L and the neutral line input end N of the second power conversion unit 40, so that when a surge voltage is generated in the circuit, the surge voltage can be suppressed, thereby protecting the second power conversion unit 40.
Further, according to the actual use requirement, a voltage dependent resistor may be connected between the live line input terminal L and the neutral line input terminal N of the first power conversion unit 30.
Considering that a large surge current is generated when a circuit is powered on, components in the circuit may be broken down, so that the circuit cannot work normally. Based on this, in some embodiments of the present application, a thermistor may be connected before the second power conversion unit 40 to limit the inrush current.
Specifically, the thermistor may be connected between the live line output terminal L of the auxiliary ac power supply unit 20 and the live line input terminal L of the second power conversion unit 40. The thermistor has a large resistance value at the moment of electrifying the circuit, and can effectively suppress surge current. After the effect of restraining surge current is finished, the resistance value of the thermistor is continuously reduced through the continuous effect of the current until the power consumed by the thermistor can be ignored, and therefore the normal work of the circuit cannot be influenced.
In the above embodiment, by connecting the thermistor between the live line input terminal L of the second power conversion unit 40 and the live line input terminal L of the auxiliary ac power supply unit 20, the surge current can be suppressed by the thermistor at the moment of power-on of the circuit, thereby preventing the second power conversion unit 40 from being damaged.
Through the device of the embodiment, alternating current input redundancy control can be realized, namely when the main alternating current power supply unit 10 breaks down, the auxiliary alternating current power supply unit 20 can supply power to the power load in time, but when the main alternating current power supply unit 10 breaks down, a user may not notice that the main alternating current power supply unit 10 is damaged due to the inside and the completion of power supply switching, and timely maintenance cannot be performed. Based on this, in some embodiments of the present application, a first failure notification unit may be added to give a notification to the user when the main ac power supply unit 10 fails.
Specifically, the first fault prompting unit is connected to the main ac power supply unit 10, and is configured to detect whether the ac output of the main ac power supply unit 10 is normal. When the main alternating current power supply unit 10 fails, the first failure prompt unit gives a prompt. The prompting mode can adopt a buzzer to give an alarm, can also adopt lamps with different colors to carry out prompting, and can also carry out prompting and the like by sending information to a user. The specific mode that adopts sends the suggestion, can select according to actual conditions, no matter which kind of suggestion mode of adoption, do not influence the realization of this application embodiment, as long as can finally reach the suggestion effect can.
In the above embodiment, by adding the first fault prompting unit, a prompt may be sent to the user when the main ac power supply unit 10 fails, so that the user may timely maintain the main ac power supply.
In an actual use process, the auxiliary ac power supply unit 20 belongs to a standby power supply, so when the main ac power supply unit 10 normally works, if the auxiliary ac power supply unit 20 is damaged, a user cannot intuitively find that the auxiliary ac power supply unit 20 is damaged from the outside, and thus when the main ac power supply unit 10 is abnormal, the auxiliary ac power supply unit 20 is damaged early and cannot supply power to a power load. On this basis, a second failure notification unit may be added to give a notification to the user when the auxiliary ac power supply unit 20 fails.
Specifically, the second prompting unit is connected to the auxiliary ac power supply unit 20, and is configured to detect whether the ac output of the auxiliary ac power supply unit 20 is normal. When the auxiliary ac power supply unit 20 fails, the second failure notification unit issues a notification. The prompting mode can adopt a buzzer to give an alarm, can also adopt lamps with different colors to carry out prompting, and can also carry out prompting and the like by sending information to a user. The specific mode that adopts sends the suggestion, can select according to actual conditions, no matter which kind of suggestion mode of adoption, do not influence the realization of this application embodiment, as long as can finally reach the suggestion effect can.
In the above embodiment, by adding the second fault prompting unit, when the auxiliary ac power supply unit 20 fails, a prompt may be sent to the user, so that the user may timely maintain the auxiliary ac power supply, and when the main ac power supply is abnormal, the auxiliary ac power supply unit 20 may supply power to the power load, thereby implementing redundant control of ac power input.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, the embodiments can be combined with each other, and the same and similar parts can be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An alternating current input redundancy control apparatus, comprising: the power supply system comprises a main alternating current power supply unit, an auxiliary alternating current power supply unit, a first power supply conversion unit, a second power supply conversion unit, a first switch unit, a second switch unit and a power load unit;
the live wire input end of the first power supply conversion unit is respectively connected with the live wire output end of the main alternating current power supply unit and the interface 3 of the second switch unit, the zero line input end of the first power supply conversion unit is respectively connected with the zero line output end of the main alternating current power supply unit and the interface 4 of the second switch unit, and the direct current output end of the first power supply conversion unit is connected with the first switch unit;
the live wire input end of the second power supply conversion unit is respectively connected with the live wire output end of the auxiliary alternating current power supply unit and an interface 7 of the second switch unit, the zero line input end of the second power supply conversion unit is respectively connected with the zero line output end of the auxiliary alternating current power supply unit and an interface 8 of the second switch unit, the first direct current output end of the second power supply conversion unit is connected with the interface 3 of the first switch unit, and the second direct current output end of the second power supply conversion unit is connected with the interface 1 of the second switch unit;
an interface 1 of the second switch unit is connected with an interface 4 of the first switch unit, an interface 5 of the second switch unit is connected with a live wire input end of the electric load unit, and an interface 6 of the second switch unit is connected with a zero line input end of the electric load unit;
in the first switch unit, the interface 1 and the interface 2 are power input ports of the first switch unit, and when the interface 1 and the interface 2 have power input, the connection relation between the interface 3 and the interface 4 is changed from connection to disconnection;
in the second switch unit, the interface 1 and the interface 2 are power input ports of the second switch unit, when the interface 1 and the interface 2 have power input, the connection relationship of the interface 3 and the interface 5, and the connection relationship of the interface 4 and the interface 6 are changed from disconnection to connection, and simultaneously the connection relationship of the interface 5 and the interface 7, and the connection relationship of the interface 6 and the interface 8 are changed from connection to disconnection.
2. The device according to claim 1, characterized in that a relay circuit is included in the first switching unit and/or the second switching unit.
3. The apparatus of claim 1, wherein the first power conversion unit and/or the second power conversion unit comprises a switching power supply circuit therein.
4. The apparatus of claim 1, further comprising: a fuse tube;
the protective tube is connected between the live wire output end of the auxiliary alternating current power supply unit and the live wire input end of the second power supply conversion unit.
5. The apparatus of claim 1, further comprising: a resistance;
one end of the resistor is connected with the first direct current output end of the second power supply conversion unit;
the other end of the resistor is connected with a second direct current output end of the second power supply conversion unit.
6. The apparatus of claim 1, further comprising: a voltage regulator diode;
the cathode of the voltage stabilizing diode is connected with the first direct current output end of the second power supply conversion unit;
and the anode of the voltage stabilizing diode is connected with the second direct current output end of the second power supply conversion unit.
7. The apparatus of claim 1, further comprising: a voltage dependent resistor;
one end of the piezoresistor is connected with the live wire input end of the second power supply conversion unit;
and the other end of the piezoresistor is connected with the zero line input end of the second power supply conversion unit.
8. The apparatus of claim 1, further comprising: a thermistor;
and the thermistor is connected between the live wire output end of the auxiliary alternating current power supply unit and the live wire input end of the second power supply conversion unit.
9. The apparatus of claim 1, further comprising: a first failure prompt unit;
the first fault prompting unit is connected with the main alternating current power supply unit;
when the main alternating current power supply unit breaks down, the first fault prompting unit can give a prompt.
10. The apparatus of claim 1, further comprising: a second failure indication unit;
the second fault prompting unit is connected with the auxiliary alternating current power supply unit;
when the auxiliary alternating current power supply unit breaks down, the second fault prompting unit can send a prompt.
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