CN200976496Y - AC power switch apparatus - Google Patents
AC power switch apparatus Download PDFInfo
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- CN200976496Y CN200976496Y CN 200620137300 CN200620137300U CN200976496Y CN 200976496 Y CN200976496 Y CN 200976496Y CN 200620137300 CN200620137300 CN 200620137300 CN 200620137300 U CN200620137300 U CN 200620137300U CN 200976496 Y CN200976496 Y CN 200976496Y
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Abstract
The utility model relates to a changeover device for mains supply, which comprises a DC supply unit by which the three-phase alternating-current supply is transformed and rectified to three-way low voltage direct current, an input voltage inspection unit by which the three-way low voltage direct current are voltage inspected and signal sampled, a central control unit where the voltage of each phase of the three-phase alternating-current supply is calculated according to the voltage inspection signal, the phase which is the best to meet the requirement is selected and the communication signal is outputted, an output control unit by which the phase which is the best to meet the requirement is outputted according to the communication signal, and a phase angle inspection unit by which the three-way low voltage direct current is sampled and the phase angle inspection signal is inputted to the central control unit. Under the condition of relatively unstable situation of the three-phase alternating-current supply, the voltage of each phase is inspected and compared and the phase which is the best to meet the requirement is selected and outputted to the electrical appliance which needs to use the stable single phase alternating-current supply by the device.
Description
Technical field
The utility model relates to field of power management, relates in particular to a kind of AC power source converting apparatus.
Background technology
Electric energy is the most widely used energy, the use of electric energy is related to the various aspects of daily production, life.Present employed AC power generally has two kinds, i.e. three-phase alternating-current supply and single phase alternating current power supply, and wherein, industrial or commercial electricity consumption is generally three-phase alternating current, and household electricity is generally single-phase alternating current; Powerful electrical equipment generally uses three-phase alternating current, low power electrical equipment generally uses single-phase alternating current, but these do not have strict boundary at present, many industry or business site also need single phase poaer supply, high-power electric appliance and small-power electrical equipment need be used sometimes together, and this conveniently uses with regard to the device that needs three phase mains and be converted to single phase poaer supply.
Existing three-phase alternating-current supply is converted to the device of single phase alternating current power supply, in transformer, utilize the characteristic of the V-type and the I type mode of connection, with V-type and I type mode of connection applied in any combination high-low pressure winding to transformer, form the V/I mode of connection, three-phase alternating-current supply directly is converted to single phase alternating current power supply, satisfies the needs that three-phase alternating-current supply is converted to single phase alternating current power supply.
In actual applications; some local three-phase alternating-current supply voltages that use are very unstable; misphase, phase shortage, under-voltage situation usually appear; these faults are not all to occur simultaneously in three-phase; produce fault often just one in the three-phase be mutually or two-phase; and out of order one is not a certain phase of fixing with normal one mutually mutually, usually can change each other.If phase of one in the three-phase alternating-current supply or two-phase are had fault, simply convert single phase alternating current power supply to by said apparatus, the voltage of the single phase alternating current power supply that obtains must be unstable, so existing apparatus can not occur under misphase, phase shortage, the under-voltage situation at three-phase alternating-current supply, effectively utilize a normal phase in the three-phase alternating-current supply, stable single phase alternating current power supply is provided, uses for the electrical equipment that needs.
Three-phase voltage is all too high or too low in three-phase alternating-current supply, and existing apparatus can't effectively be controlled, and overtension or low excessively also appears in the single phase alternating current power supply of output thereupon, very easily the electrical equipment that uses out-put supply is caused unnecessary harm.
The utility model content
At above-mentioned defective, the utility model provides a kind of AC power source converting apparatus, under the unsettled situation of three-phase alternating-current supply, can select the most satisfactory one output mutually, and metastable single phase alternating current power supply is provided, and uses for the electrical equipment that needs.
The AC power source converting apparatus that the utility model provides comprises: being used for three-phase alternating-current supply transformation, rectification is the DC power source unit of three road low-voltage DCs;
Be used for described three road low-voltage DCs are carried out the input voltage detecting unit of voltage detection signal sampling;
Be used for calculating the magnitude of voltage of described each phase of three-phase alternating-current supply, select the most satisfactory phase according to described voltage detection signal, and the centralized control unit of output Continuity signal;
Be used for according to described Continuity signal, with described the most satisfactory one output control unit of exporting mutually.
Wherein, also comprise: be used for described three road low-voltage DCs are sampled, and the phase angle detection signal of sampling imported the phase angle detecting unit of described centralized control unit.
Wherein, also comprise: be used to detect the current value of output current, and the current value detection signal that is obtained imported the output current detecting unit of described centralized control unit.
Wherein, also comprise: being used for, three-phase all undesirable at described three-phase alternating-current supply input voltage value has under misphase or phase shortage, the excessive situation of output current the alarm unit of reporting to the police.
Wherein, described input voltage detecting unit is made up of three tunnel identical testing circuits of corresponding described three-phase alternating-current supply respectively, wherein a road be:
First resistance and second resistance polyphone, the first resistance other end connects the output of described power subsystem, the other end of second resistance inserts described centralized control unit by the 3rd resistance, also by the 4th grounding through resistance, first diode is in parallel with the 4th resistance, the first diode anode ground connection, negative electrode connects the common port of the second, the 4th resistance.
Wherein, described phase angle detecting unit by corresponding described three-phase alternating-current supply respectively, three tunnel identical circuit form, wherein one the tunnel is:
The 5th resistance one end connects the direct current output plus terminal of described DC power source unit, the other end connects the base stage of first triode, the grounded emitter of first triode, collector electrode connects the input of described centralized control unit, the 6th resistance in parallel and first electric capacity between the base stage of first triode and the emitter.
A kind of AC power source converting apparatus that the utility model provides compared with prior art has the following advantages:
1, can in three-phase alternating-current supply, select the most satisfactory one to export as single phase alternating current power supply:
Under the unsettled relatively situation of three-phase alternating-current supply, by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, select the most satisfactory one as single phase alternating current power supply output, offer the electrical equipment that needs the stabilized single phase AC power; And prior art just forms the V/I mode of connection by transformer height winding, and three-phase alternating-current supply directly is converted to single phase alternating current power supply, can not respectively select mutually three-phase alternating-current supply;
2, can guarantee the stable, reliable of out-put supply;
The utility model is implemented to detect to the magnitude of voltage of each phase of three-phase alternating-current supply of input, the phase angle between the three-phase, the magnitude of voltage and the current value of output single phase alternating current power supply, undesirable when the three-phase alternating-current supply while of input, or the single phase alternating current power supply voltage of output is excessive, too small, or the electric current of output is excessive, then, prevent from the electrical equipment that uses out-put supply is caused unnecessary harm by in time cutting off modes such as output, warning simultaneously; Prior art then can not be carried out any monitoring to input, out-put supply.
Description of drawings
Fig. 1 is that the utility model first embodiment functional unit concerns schematic diagram;
Fig. 2 is the utility model second embodiment DC power source unit circuit diagram;
Fig. 3 is the utility model second embodiment input voltage detection cell circuit figure;
Fig. 4 is the utility model second embodiment three-phase alternating-current supply oscillogram;
Fig. 5 is the utility model second embodiment phase angle detection cell circuit figure;
Fig. 6 is a rectifier bridge output voltage waveform among the utility model second embodiment;
Fig. 7 is the utility model second embodiment output current detection cell circuit figure;
Fig. 8 is the utility model second embodiment output control unit circuit diagram;
Fig. 9 is the utility model second embodiment alarm unit circuit diagram;
Figure 10 is the utility model second embodiment circuit diagram;
Embodiment
Please referring to Fig. 1, for the utility model first embodiment functional unit concerns schematic diagram, this embodiment is a key control unit with centralized control unit 101, detect each phase state of three-phase alternating-current supply of input by the software computing, select only one output phase as single phase alternating current power supply, and the output of automatic control power supply, guarantee that the single phase alternating current power supply of output meets the electrical equipment instructions for use.
Wherein, several big functional units are core with centralized control unit 101, and centralized control unit 101 calculates, judges, selects in the three-phase alternating-current supply only one to export as single phase alternating current power supply according to each functional unit input signal.
DC power source unit 102 is three road stabilizing low voltage DC power supply with three-phase alternating-current supply transformation, rectification, for input voltage detecting unit 103 and phase angle detecting unit 104 provide sampled signal, also provide operating voltage for centralized control unit 101, output current detecting unit 105, output control unit 106 and alarm unit 107.
Input voltage detecting unit 103 carries out the sampling of voltage detection signal with three road low-voltage DCs that DC power source unit 102 provides, and voltage detection signal imported centralized control unit 101, centralized control unit 101 calculates the magnitude of voltage of each phase of three-phase alternating-current supply, and relatively, select the most satisfactory phase, the output Continuity signal, output control unit 106 is with its output.
Phase angle detecting unit 104 will be used for described three road low-voltage DCs are sampled, and with the sampling the phase angle detection signal import described centralized control unit 101, centralized control unit 101 is according to this phase angle detection signal, judge the sequential relationship between the described three-phase alternating-current supply three-phase, and then have or not misphase, phase shortage in the judgement three-phase.
Output current detecting unit 105 is used to detect the current value of output current, and with the current value detection signal input centralized control unit 101 that is obtained, centralized control unit 101 calculates the current value of output current according to described current value detection signal, when this current value surpasses predetermined value, centralized control unit 101 output pick-off signals are to output control unit 106, and output control unit 106 stops output according to this pick-off signal.
The part of the utility model second embodiment is identical with first embodiment, and second embodiment further provides the concrete built-up circuit of each functional unit.
See also Fig. 2, be the utility model second embodiment DC power source unit circuit diagram.The input power supply is a three-phase alternating-current supply, divides L1, L2, L3, N four lines, wherein L1, L2, L3 three-way in arbitrary line-to-line voltage be 380V, the voltage during L1, L2, L3 are three-way between arbitrary line and N line is 220V.L1, L2, three-way linear transformer T1, T2, the elementary anode of T3 imported respectively of L3, N line wiring transformer T1, the elementary negative terminal of T2, T3.
Be that example is elaborated mutually now with L1 line and N line one.The coil ratio of linear transformer T1 primary and secondary is 55/3, and when elementary input voltage was 220V, secondary output voltage was 12V, and 21,23 of linear transformer T1 time level two ends and splicing ear CN6 link to each other.Like this, by linear transformer T1, the alternating current of 220V is converted to the low-voltage AC of 12V.
21,23 of splicing ear CN6 are continuous with rectifier bridge two inputs 24,26, rectifier bridge is connected to form in turn by VD6, VD7, four diodes of VD8, VD9, rectifier bridge direct current output negative pole end points 25 ground connection, direct current output cathode end points 27 connects the diode VD5 anode that is used to isolate, the negative electrode of VD5 connects an end and the anode that polar capacitor E3 is arranged, the other end of capacitor C 6 and the negativing ending grounding that polar capacitor E3 is arranged of capacitor C 6.The anode of diode VD4 connects diode VD5 negative electrode, and negative terminal connects the input of three-terminal voltage-stabilizing pipe IC2.
Described capacitor C 6 and have the effect of polar capacitor E3 to be to export to such an extent that galvanic 12V direct current carries out flat ripple, filtering to described rectifier bridge is converted to more stable 12V direct current, again by diode VD4 input three-terminal voltage-stabilizing pipe IC2.Diode VD4 is used to prevent phase mutual interference between three road 12V power supplys, plays buffer action.
The L2 line is mutually identical with this with N line, L3 line and N line two-phase transfer process, and three road 12V positive sources connect the input of three-terminal voltage-stabilizing pipe IC2 jointly, and three-terminal voltage-stabilizing pipe IC2 is stable 5V voltage with the 12V voltage transitions, exports at output.The earth terminal ground connection of three-terminal voltage-stabilizing pipe IC2, input connects an end of capacitor C 7 and the anode of polar capacitor E4 is arranged, output connects the end of capacitor C 8, C9 and the anode of polar capacitor E5, E7 is arranged, the other end of capacitor C 7, C8, C9 and the negativing ending grounding of polar capacitor E4, E5, E7 is arranged.
DC power source unit is pressed the three-phase alternating current conversion for low-voltage AC by three linear transformers, converts low-voltage DC to by rectification circuit and filter circuit again, converts thereof into the required burning voltage of circuit by the three-terminal voltage-stabilizing pipe then.As the input of three-terminal voltage-stabilizing pipe, like this, as long as have one electricity is arranged mutually in the three-phase alternating current, but circuit is with regard to operate as normal jointly for three road low-voltage DCs that are converted to.
See also Fig. 3, be the utility model second embodiment input voltage detection cell circuit figure.12V voltage is by the A/D interface of divider resistance R14, R15, R16, R19 input centralized control unit among the DC power source unit embodiment.Wherein resistance R 14 is contacted with R15, and the anode of resistance R 14 another terminating diode VD4, resistance R 15 other ends also insert the A/D end of convert of centralized control units by resistance R 16 ground connection by resistance R 19.Voltage stabilizing didoe WY3 is in parallel with resistance R 16, the plus earth of voltage stabilizing didoe WY3, and negative electrode links to each other with resistance R 16 1 ends.
Voltage stabilizing didoe WY3 can prevent that test point voltage that factor such as surge causes is higher than the operating voltage of centralized control unit, and centralized control unit is caused damage, and guarantees centralized control unit safety, operate as normal.
Centralized control unit is extrapolated and corresponding L1 line of this road voltage and the accurate mutually magnitude of voltage of N line one according to the turn ratio of the primary and secondary coil of the resistance value ratio of detected voltage, resistance R 16 and R14 and R15, linear transformer.The L2 line is handled with N line, L3 line and N line two-phase, the reckoning process is mutually identical with L1 line and N line one.
After three road low-voltage DCs that the input voltage detecting unit is converted to DC power source unit carry out respective handling, the input centralized control unit, centralized control unit is by detecting the magnitude of voltage of three road low-voltage DCs, extrapolate the input voltage of each phase of three-phase alternating-current supply, thereby draw three-phase voltage characteristic separately in the three-phase alternating-current supply.
See also Fig. 4, be the utility model second embodiment three-phase alternating-current supply oscillogram.Wherein, abscissa is the time waveform operation angle, and ordinate is a magnitude of voltage, and the electrical degree between U, V, the W three-phase is 120 degree, and the electrical degree of zero crossing is spaced apart 60 degree.By detecting the time interval of three-phase zero crossing, obtain the sequential relationship of three-phase, and then judge whether misphase or phase shortage are arranged in the three-phase.
See also Fig. 5, be the utility model second embodiment phase angle detection cell circuit figure.Circuit bridge direct current output plus terminal 27 passes through the base stage that divider resistance R18 connects triode DQ3 in the DC power source unit embodiment circuit diagram, the grounded emitter of triode DQ3, and collector electrode connects the input of centralized control unit.Parallel resistance R17 and shunt capacitance C9 between the base stage of triode DQ3 and the emitter.
See also Fig. 6, be rectifier bridge output voltage waveform among the utility model second embodiment.Wherein, abscissa is the waveform operation angle, and ordinate is a magnitude of voltage.When voltage is higher than U1, triode DQ3 conducting, centralized control unit test side ground connection, the test side detects low level; When voltage equaled U1, promptly during the waveform pass zero point of this phase, triode DQ3 ended, and centralized control unit detects the disconnected high level that detects.
The L2 line is handled with N line, L3 line and N line two-phase, testing process is mutually identical with L1 line and N line one.Centralized control unit detects the time that high potential appears in three-phase successively, obtains the time interval of three-phase zero crossing, according to time of three-phase zero crossing whether be even cross occurrence, judge that three-phase alternating-current supply has misphase; In detecting signal, if having one not occur high level mutually, centralized control unit judges that then this is phase shortage mutually.
The phase angle detecting unit will be from the low-voltage DC of the rectification circuit of DC power source unit output, be processed into high low-potential signal input centralized control unit test side, by detecting the zero cross signal of each phase of three-phase alternating-current supply, extrapolate three alternate phase relations, and then judge whether three-phase alternating-current supply has misphase, phase shortage.
See also Fig. 7, be the utility model second embodiment output current detection cell circuit figure.AC mutual induction coil CT1 passes through two end points P6, P7 snap rings around the electric current line of exporting, the output of AC mutual induction coil CT1 connects two inputs, 71,73 ends of rectifier bridge, this rectifier bridge is connected to form in turn by VD22, VD24, four diodes of VD25 VD23, this rectifier bridge with the induced electricity shaping of AC mutual induction coil CT1 input after by the output of direct current output plus terminal 72 ends, the direct current output negative terminal 74 end ground connection of this rectifier bridge.Rectifier bridge direct current output plus terminal 72 connects an end of resistance R 27, and resistance R 27 inserts the A/D input of centralized control unit by resistance R 22.Be connected the 5V power supply by diode VD26 between R27 and R22, the anode of diode VD26 connects the 5V power supply, and negative electrode links to each other with R22 with R27, between R27 and R22 also by resistance R 26 ground connection.Pass through capacitor C 15 ground connection between resistance R 22 and the centralized control unit A/D input.
Diode VD26 prevents that the voltage that detects is higher than the operating voltage of centralized control unit, causes damage to it.The characteristic of centralized control unit by detected size of current, AC mutual induction coil CT1, resistance R 27 and the resistance ratio of resistance R 26 are extrapolated the size of output current, judge whether output current meets the requirements.
The output current detecting unit detects output current by D.C mutual-inductor, and with detected current signal input centralized control unit, centralized control unit calculates the size of output current, and then judges whether output current meets the requirements.
See also Fig. 8, be the utility model second embodiment output control unit circuit diagram.The output of centralized control unit is connected to the base stage of triode DQ6 by resistance R 38, the grounded emitter of triode DQ6, collector electrode connects the 12V positive source by the two ends 81,84 of resistance R 1, power relay RL1 coil, and the output 82,83 of power relay RL1 connects the L1 line and the N line of three-phase input power supply.Power relay RL1 coil is in parallel with diode VD1, and the anode of diode VD1 connects with R1, and negative electrode links to each other with the 12V power supply.
The catenation principle of power relay RL2, power relay RL3 is identical with power relay RL1, wherein, power relay RL2 output connects the L2 line and the N line of three-phase input power supply, and power relay RL3 output connects the L3 line and the N line of three-phase input power supply.
If centralized control unit is judged in the three-phase input power supply this optimum mutually of L1 and N line, then put high level at this corresponding output, triode DQ6 conducting thereupon, the 12V power supply is by power relay RL1, resistance R 1, triode DQ6 earth-continuity, power relay RL1 is in the adhesive conducting state, the L1 of the three-phase input power supply output that is conducted.
Output control unit is exported a certain of three-phase alternating-current supply by control relay as out-put supply.Centralized control unit selects the most satisfactory one by output control unit control output by three-phase input power source voltage is detected.
If the three-phase alternating-current supply of input is all undesirable, output control unit turn-offs all power relays according to the instruction of centralized control unit, stops output; If overtension or low excessively appears in out-put supply, output control unit just makes in running order relay disconnect, and centralized control unit is judged the state of each phase of three-phase alternating-current supply of input, reselects only one mutually as the output phase; Exceed predefined scope if current detecting unit detects output current, centralized control unit then turn-offs all power relays, stops output.
See also Fig. 9, be the utility model second embodiment alarm unit circuit diagram.Centralized control unit four tunnel outputs are connected with the 5V power supply with light-emitting diode by resistance, and wherein, an output is by the negative electrode of resistance R 34 connection LEDs 4, and the anode of LED 4 connects the 5V power supply.Other catenation principle of three tunnel is identical with this road, and wherein, LED 1, LED2, LED3, LED4 represent that respectively overvoltage/undervoltage is reported to the police, phase shortage is reported to the police, misphase is reported to the police and overcurrent is reported to the police.
Three-phase voltage is all too high or too low in the three-phase alternating current that detects input, and centralized control unit is in the corresponding output end output low level, and LED 4 conductings are luminous, and caution voltage occurs too high or too low.Detecting in the three-phase alternating current of input has misphase, phase shortage or output current excessive, and the principle of warning is with overtension or to cross low alarm principle identical.
See also Figure 10, be the utility model second embodiment circuit diagram, this circuit is made up of above-mentioned each functional unit.Centralized control unit is single-chip microcomputer IC1, single-chip microcomputer IC1 receives the voltage signal of input voltage detecting unit, the transmission of output current detecting unit by the A/D input interface, receive the high low-potential signal of phase angle testing circuit input by the input termination, single-chip microcomputer IC1 internal processes carries out calculation process to these signals, by detecting the magnitude of voltage of the every phase of three-phase alternating-current supply, select voltage the most satisfactory one to export by output control unit.
When three-phase alternating-current supply appearance fluctuation, one of selection is not an optimum phase time mutually, and single-chip microcomputer IC1 in time adjusts, and selects optimum one again and fails mutually.Single-chip microcomputer IC1 detects output current by the output current detecting unit, and the electric current of output is excessive, and single-chip microcomputer IC1 can cut off output automatically and report to the police; Simultaneously excessive or too small when the input three-phase current, single-chip microcomputer IC1 cuts off output automatically and reports to the police; In the three-phase alternating-current supply of input abnormal conditions such as misphase, phase shortage are arranged, single-chip microcomputer IC1 reports to the police, and guarantees that the power supply of exporting is stable, reliable.
The utility model by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, selects the most satisfactory one as single phase alternating current power supply output under the unsettled relatively situation of three-phase alternating-current supply, offer the electrical equipment that needs the stabilized single phase AC power.
The utility model is implemented to detect to the magnitude of voltage of each phase of three-phase alternating-current supply of input, the phase angle between the three-phase, the magnitude of voltage and the current value of output single phase alternating current power supply, undesirable when the three-phase alternating-current supply while of input, or the single phase alternating current power supply voltage of output is excessive, too small, or the electric current of output is excessive, then, prevent from the electrical equipment that uses out-put supply is caused unnecessary harm by in time cutting off modes such as output, warning simultaneously.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1, a kind of AC power source converting apparatus is characterized in that, comprising:
Being used for three-phase alternating-current supply transformation, rectification is the DC power source unit of three road low-voltage DCs;
Be used for described three road low-voltage DCs are carried out the input voltage detecting unit of voltage detection signal sampling;
Be used for calculating the magnitude of voltage of described each phase of three-phase alternating-current supply, select the most satisfactory phase according to described voltage detection signal, and the centralized control unit of output Continuity signal;
Be used for according to described Continuity signal, with described the most satisfactory one output control unit of exporting mutually.
2, device according to claim 1 is characterized in that, also comprises:
Be used for described three road low-voltage DCs are sampled, and the phase angle detection signal of sampling imported the phase angle detecting unit of described centralized control unit.
3, device according to claim 1 is characterized in that, also comprises:
Be used to detect the current value of output current, and the current value detection signal that is obtained imported the output current detecting unit of described centralized control unit.
4, device according to claim 1 is characterized in that, also comprises:
Be used for, three-phase all undesirable the alarm unit of reporting to the police is arranged under misphase or phase shortage, the excessive situation of output current at described three-phase alternating-current supply input voltage value.
5, device according to claim 1 is characterized in that, described input voltage detecting unit is made up of three tunnel identical testing circuits of corresponding described three-phase alternating-current supply respectively, wherein a road be:
First resistance and second resistance polyphone, the first resistance other end connects the output of described power subsystem, the other end of second resistance inserts described centralized control unit by the 3rd resistance, also by the 4th grounding through resistance, first diode is in parallel with the 4th resistance, the first diode anode ground connection, negative electrode connects the common port of the second, the 4th resistance.
6, device according to claim 2 is characterized in that, described phase angle detecting unit by corresponding described three-phase alternating-current supply respectively, three tunnel identical circuit form, wherein one the tunnel is:
The 5th resistance one end connects the direct current output plus terminal of described DC power source unit, the other end connects the base stage of first triode, the grounded emitter of first triode, collector electrode connects the input of described centralized control unit, the 6th resistance in parallel and first electric capacity between the base stage of first triode and the emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620137300 CN200976496Y (en) | 2006-04-28 | 2006-09-30 | AC power switch apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620113269 | 2006-04-28 | ||
| CN200620113269.1 | 2006-04-28 | ||
| CN 200620137300 CN200976496Y (en) | 2006-04-28 | 2006-09-30 | AC power switch apparatus |
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| CN200976496Y true CN200976496Y (en) | 2007-11-14 |
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| CN 200620137300 Expired - Lifetime CN200976496Y (en) | 2006-04-28 | 2006-09-30 | AC power switch apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237156B (en) * | 2007-12-07 | 2010-06-09 | 深圳市东盛兴科技有限公司 | Realization method for wall-hang energy-saving high-frequency switch DC power system |
| CN101064480B (en) * | 2006-04-28 | 2011-11-16 | 海尔集团公司 | AC power source converting apparatus and method |
| CN108123420A (en) * | 2016-11-29 | 2018-06-05 | 沈阳高精数控智能技术股份有限公司 | A kind of direct current and AC power alarm and protection circuit and method |
-
2006
- 2006-09-30 CN CN 200620137300 patent/CN200976496Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064480B (en) * | 2006-04-28 | 2011-11-16 | 海尔集团公司 | AC power source converting apparatus and method |
| CN101237156B (en) * | 2007-12-07 | 2010-06-09 | 深圳市东盛兴科技有限公司 | Realization method for wall-hang energy-saving high-frequency switch DC power system |
| CN108123420A (en) * | 2016-11-29 | 2018-06-05 | 沈阳高精数控智能技术股份有限公司 | A kind of direct current and AC power alarm and protection circuit and method |
| CN108123420B (en) * | 2016-11-29 | 2019-05-14 | 沈阳高精数控智能技术股份有限公司 | A kind of direct current and AC power source alarm and protection circuit and method |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20071114 Effective date of abandoning: 20060930 |