CN101651346B - Multi-phase power supply device and method - Google Patents
Multi-phase power supply device and method Download PDFInfo
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Abstract
The invention discloses multi-phase power supply device and method, applied to the technical field of power supply. The method comprises the following steps: a power supply detection module in the multi-phase power supply device detects the power supply information of each phase power supply to loads in a multiphase power supply system; and when at least one phase power supply fails to supply a load, a failure-processing module selects a power supply without failures so as to supply the load corresponding to the power supply with a failure. Compared with the prior multi-phase power supply device which switches off a phase power supply failing to supply a load and starts a backup power supply, the multi-phase power supply device utilizes a power supply without failures to supply a load, improves the utilization rate of a power network, lessens the use of a backup power supply and decreases the cost and the energy consumption.
Description
Technical field
The present invention relates to the power supply technique field, particularly multi-phase power supply device and method.
Background technology
In the power supply grid of heterogeneous power supply such as three-phase and four-line standard;, user's side equipment fault etc. too much owing to single-phase load in supply of electric power deficiency, the electrical network causes electrical network phase shortage or serious three-phase imbalance; comprise detection module and phase shortage and unbalance protection module in the multi-phase power supply device of existing three-phase four-wire system; when detection module detects the electrical network phase shortage appears and when uneven in the power supply grid; phase shortage and unbalance protection module can be cut off many phase alternating current to the power supply of load, and start back-up source.
In the process that above-mentioned prior art is put into practice and studied, the present inventor finds: in the prior art when phase shortage or three-phase imbalance, by cutting off the power supply of multi-phase AC power, so that the reliability of power supply grid reduces, and use stand-by power supply can promote cost and energy consumption like this.
Summary of the invention
The embodiment of the invention provides multi-phase power supply device and method, improves the utilance of electrical network.
The embodiment of the invention provides a kind of multi-phase power supply device, and described multi-phase power supply device comprises at least two-phase power supply, and in the described at least two-phase power supply each is on good terms and is at least one load supplying, and this multi-phase power supply device also comprises:
The power supply detection module is for detection of the power supply information of each the phase power supply in the described multi-phase power supply system to load;
Fault processing module is used for when power supply information that described power supply detection module detects shows at least one phase power supply the power supply of load is broken down, and the phase power supply that selection is not broken down is powered to the corresponding load of phase power supply that this breaks down
The embodiment of the invention provides a kind of heterogeneous method of supplying power to, is used for multi-phase power supply device, and described multi-phase power supply device comprises at least two-phase power supply, and in the described at least two-phase power supply each all can be at least one load supplying mutually, comprising:
Detect in the multi-phase power supply system each phase power supply to the power supply information of load by the power supply detection module;
When described power supply information shows at least one phase power supply the power supply of load is broken down, by the phase power supply that fault processing module is selected not break down the corresponding load of phase power supply that this breaks down is powered.
Detect in the multi-phase power supply system each phase power supply to the power supply information of load when the power supply detection module in the multi-phase power supply device of the embodiment of the invention, show when having at least a phase power supply that the power supply of load is broken down, the power supply that fault processing module is selected not break down is powered to the load corresponding to power supply of breaking down, like this with the multi-phase power supply device of prior art in when having one power supply break down to the power supply of load mutually, cut off the electricity supply and open back-up source and compare, the power supply that the multi-phase power supply device utilization of the embodiment of the invention is not broken down is powered for load, can improve the utilance of electrical network, and reduce the use of back-up source, reduce cost and energy consumption.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the multi-phase power supply device that provides of present device embodiment;
Fig. 2 is the structural representation of another multi-phase power supply device of providing of present device embodiment;
Fig. 3 is the structural representation of the multi-phase power supply device that provides of present device embodiment one;
Fig. 4 is the structural representation of the multi-phase power supply device that provides of present device embodiment two;
Fig. 5 is the structural representation of the multi-phase power supply device that provides of present device embodiment three;
Fig. 6 is the structural representation of the multi-phase power supply device that provides of present device embodiment four;
Fig. 7 is the flow chart of the heterogeneous method of supplying power to that provides of the inventive method embodiment one.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Apparatus embodiments
A kind of multi-phase power supply device, multi-phase power supply device comprise at least two-phase power supply, and in the described at least two-phase power supply each all can be at least one load supplying mutually, and structural representation comprises as shown in Figure 1:
The power supply detection module 10, for detection of each phase power supply in the multi-phase power supply system to the power supply information of load; Power supply detection module 10 can detect the power supply information such as supply power voltage of each phase power supply when detecting; And comprise polyphase source (at least three-phase) and each mutually load corresponding to power supply in the multi-phase power supply system, or polyphase source and a phase load;
Here a phase power supply breaks down to the power supply of load and refers to: the supply power voltage of this phase power supply differs above allowed band with the supply power voltage of other phase power supplys, or the supply power voltage value of this phase power supply exceeds the scope that respective load allows, or harmonic content surpasses certain value etc. in the supply power voltage of this phase power supply, if power supply detection module 10 is when detecting the supply power voltage of each phase power supply, then when some voltage and other magnitudes of voltage differ above allowed band, determine that then a phase power supply corresponding to this voltage breaks down, fault processing module 20 is when being chosen as the power supply of the corresponding load supplying of power supply that breaks down, can select according to the strategy that presets, power such as the higher power supply of selection power supply quality priority etc.
Be appreciated that when the supply power voltage value larger, or the harmonic content of supply power voltage is when less, the power supply quality priority of power supply is higher.
Alternatively, fault processing module 20 can comprise: comparison sub-module 201, be used for other phase power supply that does not break down of more described power supply detection module 10 detections to the power supply information of load, obtain the power supply quality priority of described other phase power supply that does not break down; The power supply information here comprises the supply power voltage size, the information such as the harmonic content of supply power voltage, chooser module 202, the higher power supply of power supply quality priority medium priority that is used for selecting described comparison sub-module 201 to obtain is powered at least one phase power supply correspondence load that this breaks down.
Particularly, with reference to shown in Figure 2, fault processing module 20 can be realized by following structure: fault processing module 20 comprises: control unit 220 and a plurality of control switch 210; Here control switch 210 can be contactor, single-stage contactor, or three grades of contactors, or static switch, or the control switch of simulation etc.; Each phase power supply input in the described multi-phase power supply system is inputted between the corresponding load with polyphase source and is connected with control switch 210, the control output end 1 of described control unit 220 connects the control end 2 of described control switch 210, and described control unit 220 other ends are connected with described power supply detection module 10; Described control unit 220 is used for the power supply information according to described power supply detection module 10 detections, controls disconnection or the closure of described control switch 210.
As seen, detect in the multi-phase power supply system each phase power supply to the power supply information of load when power supply detection module 10 in the multi-phase power supply device of the embodiment of the invention, show when having at least a phase power supply that the power supply of load is broken down, the power supply that fault processing module 20 is selected not break down is powered to the load corresponding to power supply of breaking down, like this with the multi-phase power supply device of prior art in when having one power supply break down to the power supply of load mutually, cut off the electricity supply and open back-up source and compare, the power supply that the multi-phase power supply device utilization of the embodiment of the invention is not broken down is powered for load, can improve the utilance of electrical network, and reduce the use of back-up source, reduce cost and energy consumption.
The electric power system of the below take multi-phase power supply system as three-phase and four-line is example, and multi-phase power supply device of the present invention and method are described:
Apparatus embodiments one
A kind of multi-phase power supply device, in the present embodiment, multi-phase power supply system is the electric power system of three-phase and four-line, comprise three phase mains input R, S, T and three phase mains input respectively threephase load R1, S1, the T1 of correspondence, and control switch 210 is contactor in the fault processing module 20, structural representation comprises as shown in Figure 3:
In the present embodiment, power supply detection module 10 be by three phase mains input R, S, T be connected respectively the voltage detector realization between the N at zero point in the three-phase four wire system;
When wherein control unit 220 can have at least the power supply of a phase power supply to break down in finding R, S, T phase power supply, differ above allowed band such as the supply power voltage of the mutually electric power supply supply power voltage with other phase power supplys, or the supply power voltage value of a phase power supply exceeds the scope that respective load allows, or harmonic content surpasses certain value etc. in the supply power voltage of a phase power supply, and the phase voltage that can select to approach with the line voltage value is that load corresponding to trouble power powered; Can also analyze other power supply that does not break down mutually to the power supply information of load, obtain power supply quality priority, and the higher power supply of selection power supply quality priority is that the corresponding load of power supply of breaking down is powered, wherein power supply quality priority determines it is according to R, the S of voltage detector detection, the power supply information of T phase power supply, such as voltage swing, what of voltage harmonic content wait unit usually definite in each phase power supply, larger at magnitude of voltage, and the power supply quality priority of the less power supply of harmonic content is higher.For example, when control unit 220 analysis obtains the value of V3 and V2 and V1 value and differs above allowed band, then determine T phase power failure, and analysis obtains the power supply quality priority that R, S phase power supply are powered to R1, S1 phase load respectively, select the higher R phase power supply of power supply quality priority that the T1 phase load is powered, then control contactor KM11 changes closure state into by original off-state, and control contactor KM31 changes off-state into by original closure state.
Need to prove, when control unit 220 obtains the power supply quality priority of other power supply that does not break down mutually when identical, need to select according to other strategies that preset, as breaking down when T phase power supply, and R is identical with the power supply quality priority of S phase power supply, then specifies the preferential R of selection phase power supply that the T1 phase load is powered according to the strategy that presets.
As shown in table 1 below, the state of 220 pairs of control switchs 210 of control unit can carry out following control, wherein+expression is closed, and-expression disconnects.
Table 1
As above shown in the table 1, under normal condition, namely three phase mains is to the confession electric equilibrium of threephase load, and when not breaking down, control unit 220 control contactor KM13, KM22, KM31 are closed, and other contactor all disconnects; When R breaks down mutually, can select arbitrarily S phase or T to be mutually the power supply of R1 phase load, control unit 220 can also obtain S and T power supply quality priority mutually according to the power supply information of power supply detecting unit 10 detections, is the power supply of R1 phase load by the high phase power supply of its medium priority; When S broke down mutually, can select arbitrarily R phase or T phase power supply was the power supply of S1 phase load, and also can select the high phase power supply of priority is the power supply of S1 phase load; When the T phase fault, can select arbitrarily R phase or S phase power supply is the power supply of T1 phase load, and also can select the high phase power supply of priority is the power supply of T1 phase load; When R, S break down mutually, be R1, the power supply of S1 phase load mutually by T directly; When R, T break down mutually, be R1, the power supply of T1 phase load mutually by S; When S, T break down mutually, be S1, the power supply of T1 phase load mutually by R; Behind Failure elimination, control unit 220 can control contactor returns to the operating state when normal automatically.
The multi-phase power supply device of the present embodiment, wherein all be connected with control switch 210 between a phase power supply and each phase load, like this by being connected between control unit 220 control one phase power supply and each phase load, then so that any phase power supply in the multi-phase power supply system all may power for a phase load wherein.Improved fully the utilance of electrical network, reduced rear by the use of power supply.
Apparatus embodiments two
A kind of multi-phase power supply device, in the present embodiment, multi-phase power supply system is the electric power system of three-phase and four-line, comprise three phase mains input R, S, T and three phase mains input respectively threephase load R1, S1, the T1 of correspondence, and control switch 210 is the single-stage contactor in the fault processing module 20, structural representation comprises as shown in Figure 4:
In the present embodiment, power supply detection module 10 be by three phase mains input R, S, T be connected respectively the voltage detector realization between the N at zero point in the three-phase four wire system;
When wherein control unit 220 can have the power supply of a phase power supply to break down in finding R, S, T phase power supply, automatically control another power supply that does not break down mutually the corresponding load of power supply of breaking down is powered.For example, when control unit 220 Analysis deterrmination R phase power failures, control another phase power supply S to the power supply of R1 phase load, then control contactor KM2 changes closure state into by original off-state, and control contactor KM1 changes off-state into by original closure state.
As shown in table 2 below, in the present embodiment, the state of 220 pairs of control switchs 210 of control unit carries out following control, wherein+expression is closed, and-expression disconnects, and following table 2 can be preset in the control unit 220.
Table 2
As above shown in the table 2, under normal condition, namely three phase mains is to the confession electric equilibrium of threephase load, and when not breaking down, control unit 220 is controlled single-stage contactor KM2, KM4, KM6 are closed; When R breaks down mutually, be mutually the power supply of R1 phase load by S; When S breaks down mutually, be mutually the power supply of S1 phase load by T; When the T phase fault, be mutually the power supply of T1 phase load by R; Behind Failure elimination, control unit 220 can be controlled the single-stage contactor and automatically return to operating state when normal.
The multi-phase power supply device of the present embodiment wherein all is connected with control switch 210 between a phase load and the two-phase power supply, when wherein the power supply of a phase power supply was broken down, control unit 220 another phase power supplys of control were powered for this phase load like this.Control unit 220 has improved the utilance of electrical network fully when the break-make of control control switch 210 like this, and reduction is rear by the use of power supply, and fairly simple.
Apparatus embodiments three
A kind of multi-phase power supply device, in the present embodiment, multi-phase power supply system is the electric power system of three-phase and four-line, comprise three phase mains input R, S, T and three phase mains input respectively threephase load R1, S1, the T1 of correspondence, and control switch 210 is three grades of contactors in the fault processing module 20, namely comprise the single-stage contactor of three parallel connections, structural representation comprises as shown in Figure 5:
In the present embodiment, power supply detection module 10 be by three phase mains input R, S, T be connected respectively the voltage detector realization between the N at zero point in the three-phase four wire system;
When wherein control unit 220 can have the power supply of a phase power supply to break down in finding R, S, T phase power supply, automatically control another power supply that does not break down mutually the corresponding load of power supply of breaking down is powered.For example, when control unit 220 Analysis deterrmination R phase power failures, control another phase power supply S to the power supply of R1 phase load, then control contactor KM2 changes closure state into by original off-state, and control contactor KM1 changes off-state into by original closure state.
As shown in table 3 below, in the present embodiment, the state of 220 pairs of control switchs 210 of control unit carries out following control, wherein+expression is closed, and-expression disconnects, and following table 3 can be preset in the control unit 220.
Table 3
As above shown in the table 3, under normal condition, namely three phase mains is to the confession electric equilibrium of threephase load, and when not breaking down, three grades of contactor KM1 of control unit 220 controls disconnect, and KM2, KM3 and KM4 are closed; When R breaks down mutually, control three grades of contactor KM2 closed, be mutually the power supply of R1 phase load by S; When S breaks down mutually, control three grades of contactor KM3 closed, be mutually the power supply of S1 phase load by T; When the T phase fault, control three grades of contactor KM4 closed, be mutually the power supply of T1 phase load by R; Behind Failure elimination, control unit 220 can be controlled the single-stage contactor and automatically return to operating state when normal.
The multi-phase power supply device of the present embodiment, wherein all be connected with control switch 210 between a phase power supply and each phase load, like this by being connected between control unit 220 control one phase power supply and each phase load, then so that any phase power supply in the multi-phase power supply system all may power for a phase load wherein.Improved fully the utilance of electrical network, reduced rear by the use of power supply.
Apparatus embodiments four
A kind of multi-phase power supply device, in the present embodiment, multi-phase power supply system is the electric power system of three-phase and four-line, comprises three phase mains R, S, T and a phase load L, structural representation comprises as shown in Figure 6:
In the present embodiment, power supply detection module 10 be by three phase mains input R, S, T be connected respectively the voltage detector realization between the N at zero point in the three-phase four wire system;
Wherein control unit 220 can be when finding that current power supply for the power supply of L phase load breaks down, can select with the immediate phase voltage of line voltage is the power supply of L phase load, also can analyze the power supply quality priority that obtains other power supply that does not break down mutually, and the higher power supply of selection power supply quality priority is that the L phase load is powered, wherein definite definite method described in apparatus embodiments one of power supply quality priority does not repeat them here.For example, under normal circumstances, be that any phase power supply is not when all breaking down, be L phase load power supply by the highest R phase power supply of power supply quality priority, when control unit 220 Analysis deterrmination R phase power failures, and analyze and to obtain R, S phase power supply respectively to the power supply quality priority of load supplying, select the higher S phase power supply of power supply quality priority that the L phase load is powered, then control contactor KM21 changes closure state into by original off-state, and control contactor KM11 changes off-state into by original closure state.
Need to prove, when control unit 220 obtains the power supply quality priority of other power supply that does not break down mutually when identical, need to select according to other strategies that preset, as breaking down when T phase power supply, and R is identical with the power supply quality priority of S phase power supply, then specifies the preferential R of selection phase power supply that the L phase load is powered according to the strategy that presets.
As shown in table 4 below, the state of 220 pairs of control switchs 210 of control unit carries out following control, wherein+expression is closed, and-expression disconnects.
Table 4
As above shown in the table 4, under normal condition, when namely three phase mains does not break down, maximum contactor closures among control unit 220 control contactor KM11, KM21, the KM31; When if R breaks down mutually, can select by S phase or T phase power supply is the power supply of L phase load; When S broke down mutually, can select by R phase or T phase power supply was the power supply of L phase load; When the T phase fault, can select by R phase or S phase power supply is the power supply of L phase load; When R, S break down mutually, be the power supply of L phase load by T phase power supply; When R, T break down mutually, be the power supply of L phase load by S phase power supply; When S, T break down mutually, be the power supply of L phase load by R phase power supply; Behind Failure elimination, control unit 220 can control contactor returns to the operating state when normal automatically.
The multi-phase power supply device of the present embodiment, wherein all be connected with control switch 210 between the L phase load in each phase power supply and the three-phase power supply system, like this by being connected between each phase power supply of control unit 220 control and the L phase load, then so that any phase power supply in the multi-phase power supply system all may power for the L phase load.Improved fully the utilance of electrical network, reduced rear by the use of power supply.
Embodiment of the method
A kind of heterogeneous method of supplying power to is used for multi-phase power supply device, and described multi-phase power supply device comprises at least two-phase power supply, and in the described at least two-phase power supply each all can be at least one load supplying mutually, and flow chart comprises as shown in Figure 7:
Be appreciated that multi-phase power supply system is the electric power system that comprises heterogeneous (at least three-phase) power supply, when detecting, can detect the information such as harmonic content, supply power voltage of each phase power supply.
Here a phase power supply breaks down to the power supply of load and refers to: when the supply power voltage of the supply power voltage of this phase power supply and other phase power supplys differs and exceeds allowed band or the supply power voltage value of this phase power supply exceed the scope that respective load allows, or harmonic content surpasses certain value etc. in the supply power voltage of this phase power supply, if in step 101, detect be the supply power voltage of each phase power supply the time, then differ when exceeding allowed band very much when some voltage and other magnitudes of voltage, the phase power supply that then this voltage is corresponding breaks down.
When being chosen as the corresponding load of the power supply that breaks down and powering, can by the strategy that presets select as with the immediate power supply of line voltage; Or, other phase power supply that does not break down that relatively detects is to the power supply information of load, obtain the power supply quality priority of the described power supply that does not break down, select the power supply that wherein power supply quality priority is higher that at least one phase power supply correspondence load that this breaks down is powered.Wherein power supply information comprises the harmonic content of supply power voltage value, power supply etc., and when supply power voltage is less, and voltage harmonic content is defined as the higher phase power supply of power supply quality priority when less.
As seen, detect in the multi-phase power supply system each phase power supply to the power supply information of load when the power supply detection module in the multi-phase power supply device of the embodiment of the invention, show when having at least a phase power supply that the power supply of load is broken down, the power supply that fault processing module is selected not break down is powered to the load corresponding to power supply of breaking down, like this with the multi-phase power supply device of prior art in when having one power supply break down to the power supply of load mutually, cut off the electricity supply and open back-up source and compare, the power supply that the multi-phase power supply device utilization of the embodiment of the invention is not broken down is powered for load, can improve the utilance of electrical network, and reduce the use of back-up source, reduce cost and energy consumption.
Understandablely be, be take three phase mains as example in embodiments of the present invention, but in the situation that needs, the present invention equally can be applicable among the various power-supply systems always, such as the electric power system with two-phase power supply, perhaps have in the electric power system more than three phase mains.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the relevant hardware of instruction finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: read-only memory (ROM), random access memory (RAM), disk or CD etc.
Above multi-phase power supply device and the method that the embodiment of the invention is provided, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. multi-phase power supply device, described multi-phase power supply device comprises at least two-phase power supply, and in the described at least two-phase power supply each all can is characterized in that at least one load supplying mutually, this multi-phase power supply device also comprises:
The power supply detection module is for detection of the power supply information of each the phase power supply in the multi-phase power supply device to load;
Fault processing module is used for when power supply information that described power supply detection module detects shows at least one phase power supply the power supply of load is broken down, and the phase power supply that selection is not broken down is powered to the corresponding load of phase power supply that this breaks down.
2. multi-phase power supply device as claimed in claim 1 is characterized in that, described fault processing module comprises:
Comparison sub-module is used for other phase power supply that does not break down of more described power supply detection module detection to the power supply information of load, obtains the power supply quality priority of described other phase power supply that does not break down;
The chooser module, the higher phase power supply of power supply quality priority medium priority that is used for selecting described comparison sub-module to obtain is powered to load corresponding at least one phase power supply that this breaks down.
3. multi-phase power supply device as claimed in claim 1 is characterized in that, described fault processing module specifically comprises: control unit and a plurality of control switch;
Each phase power supply input in the described multi-phase power supply device is inputted between the corresponding load with polyphase source and is connected with control switch, the control output end of described control unit connects the control end of described control switch, and the described control unit other end is connected with described power supply detection module;
Described control unit is used for the power supply information according to described power supply detection module detection, controls disconnection or the closure of described control switch.
4. multi-phase power supply device as claimed in claim 3 is characterized in that, described control switch is the single-stage contactor, or three grades of contactors, or static switch.
5. multi-phase power supply device as claimed in claim 1, it is characterized in that, the supply power voltage that described fault comprises this phase power supply differs above allowed band with the supply power voltage of other phase power supplys, or the supply power voltage value of this phase power supply exceeds the scope that respective load allows, or harmonic content surpasses a preset value in the supply power voltage of this phase power supply.
6. heterogeneous method of supplying power to is used for multi-phase power supply device, and described multi-phase power supply device comprises at least two-phase power supply, and in the described at least two-phase power supply each all can is characterized in that at least one load supplying mutually, comprising:
Detect in the multi-phase power supply device each phase power supply to the power supply information of load by the power supply detection module;
When described power supply information shows at least one phase power supply the power supply of load is broken down, by the phase power supply that fault processing module is selected not break down the corresponding load of phase power supply that this breaks down is powered.
7. method as claimed in claim 6 is characterized in that, the phase power supply that described selection is not broken down is powered to this load corresponding at least one phase power supply of breaking down and is specially:
Select by the strategy that presets; Or,
Other phase power supply that does not break down that relatively detects is to the power supply information of load, obtain the power supply quality priority of the described phase power supply that does not break down, select the phase power supply that wherein power supply quality priority is higher that load corresponding at least one phase power supply that this breaks down powered.
8. method as claimed in claim 7 is characterized in that, described power supply information comprises supply power voltage, and/or the harmonic content of power supply.
9. method as claimed in claim 6, it is characterized in that, the supply power voltage that described fault comprises this phase power supply differs above allowed band with the supply power voltage of other phase power supplys, or the supply power voltage value of this phase power supply exceeds the scope that respective load allows, or harmonic content surpasses a preset value in the supply power voltage of this phase power supply.
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| CN 200910174226 CN101651346B (en) | 2009-09-23 | 2009-09-23 | Multi-phase power supply device and method |
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| CN102638037B (en) * | 2012-03-16 | 2016-03-30 | 华为技术有限公司 | The method for controlling power supply of communication equipment, system and electric power system |
| CN105262205A (en) * | 2015-10-30 | 2016-01-20 | 国家电网公司 | Dual-power switching control circuit of collection terminal |
| CN105244997A (en) * | 2015-10-30 | 2016-01-13 | 国家电网公司 | Double power switching device for acquisition terminal |
| EP3776804B1 (en) * | 2018-07-05 | 2022-05-11 | Phasor Ltd | Detection and compensation of power phase loss |
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| CN1477656A (en) * | 2003-06-18 | 2004-02-25 | 中国石化集团河南石油勘探局水电厂 | Fault phase-supplementing combined transformer |
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| CN2064123U (en) * | 1989-04-26 | 1990-10-17 | 马国良 | Auto-controlled fixed phase-sequence converter |
| CN2363364Y (en) * | 1998-12-18 | 2000-02-09 | 李淑芹 | Four-post iron core three-group no-interference combined transformer |
| GB2392029A (en) * | 2002-08-16 | 2004-02-18 | Jeffery William Rodbard | Phase failure relay for detecting multiple faults |
| CN1477656A (en) * | 2003-06-18 | 2004-02-25 | 中国石化集团河南石油勘探局水电厂 | Fault phase-supplementing combined transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356586A (en) * | 2015-12-08 | 2016-02-24 | 深圳市通普科技有限公司 | LED display screen supply circuit |
| CN105356586B (en) * | 2015-12-08 | 2019-01-15 | 张长领 | LED display power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101651346A (en) | 2010-02-17 |
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