CN201541118U - Three-phase power protecting device of power load - Google Patents
Three-phase power protecting device of power load Download PDFInfo
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- CN201541118U CN201541118U CN2009202059409U CN200920205940U CN201541118U CN 201541118 U CN201541118 U CN 201541118U CN 2009202059409 U CN2009202059409 U CN 2009202059409U CN 200920205940 U CN200920205940 U CN 200920205940U CN 201541118 U CN201541118 U CN 201541118U
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Abstract
The utility model provides a three-phase power protecting device of power load, which is adaptable to the technical field of power electronics. The three-phase power protecting device comprises a central control unit, a phase sequence detection unit and a phase sequence control unit, wherein the phase sequence detection unit transmits a first pulse signal and/or a second pulse signal to the central control unit according to the first pulse signal and/or the second pulse signal which are produced by a three-phase power supply; and the phase sequence detection unit calculates time difference of first pulse signal fall time and second pulse signal fall time when the central control unit judges receiving of the first pulse signal and the second pulse signal which are transmitted by the phase sequence detection unit. When the time difference approaches a first preset value, a phase sequence adjustment signal is outputted to the phase sequence control unit through the central control unit, and the phase sequence control unit adjusts phase sequence of the three-phase power supply for supplying power to the power load according to the phase sequence adjustment signal. The device eliminates manual adjustment of users, ensures reliability and timeliness of phase sequence adjustment operation, and saves manpower and financial resources.
Description
Technical field
The utility model belongs to electric and electronic technical field, relates in particular to a kind of three phase mains protective device of electrical load.
Background technology
Be applied to the air-conditioning system of family or hotel at present, its compressor is a three phase electric machine, the power supply of employing three phase mains, and when the phase sequence of three phase mains makes a mistake, reversal development appears in compressor, reduced compressor operating efficient, waste electric energy, and the long-time counter-rotating of compressor is burnt easily.For this reason, prior art provides a kind of phase sequence detection apparatus, the opposite phenomenon of phase sequence whether occurs with the three phase mains that detects to the air-conditioning power supply, and when detecting three phase mains to the air-conditioning power supply and the opposite phenomenon of phase sequence occurs, cut off three phase mains and power, send alarm to the user simultaneously to air-conditioning.The user can adjust accordingly phase sequence according to information.
Though this of air-conditioning kind of power protection mode has been avoided the inefficiency that compressor reverse rotation brings, the problem that is easy to burn; yet when detecting three phase mains to air-conditioning power supply and the opposite phenomenon of phase sequence occurs; still need user's manual adjustment phase sequence, waste of manpower financial resources, and complex operation.
The utility model content
The purpose of this utility model is to provide a kind of three phase mains protective device of electrical load; be intended to solve that prior art provides to the power protection mode of air-conditioning when detecting three phase mains to the air-conditioning power supply and the opposite phenomenon of phase sequence occurs; still need user's manual adjustment phase sequence; waste of manpower financial resources, and the problem of complex operation.
The utility model is achieved in that a kind of three phase mains protective device of electrical load, and described device comprises:
Store the central control unit of first preset value;
Be connected in the phase sequence detecting unit between the first input end of the voltage output end of three phase mains and described central control unit, described phase sequence detecting unit produces first pulse signal and/or second pulse signal according to described three phase mains, and described first pulse signal and/or second pulse signal sent to described central control unit, described central control unit judges whether to receive first pulse signal and/or second pulse signal that described phase sequence detecting unit sends, judge when receiving first pulse signal that described phase sequence detecting unit sends and second pulse signal when described central control unit, calculate the time difference of described first pulse signal trailing edge time and the described second pulse signal trailing edge time; And
Be connected in the phase sequence control unit between the power supply terminal of first output of described central control unit and electrical load, described central control unit is in described time difference during near described first preset value, first output by described central control unit is adjusted signal to described phase sequence control unit output phase sequence, described phase sequence control unit is adjusted signal according to described phase sequence, adjusts the phase sequence of described three phase mains to the electrical load power supply.
In the three phase mains protective device of above-mentioned electrical load, described device also comprises the auxiliary source unit, the input of described auxiliary source unit connects the voltage output end of described three phase mains, and an output of described auxiliary source unit connects the feeder ear of described phase sequence control unit;
Described auxiliary source unit carries out power frequency step-down processing to the alternating current of described three phase mains output, and after the AC rectification after described power frequency step-down handled becomes direct current, voltage stabilizing becomes the first required direct voltage of described phase sequence control unit work, adopts described first direct voltage to power to described phase sequence control unit afterwards.
Further, another output of described auxiliary source unit connects the feeder ear of described phase sequence detecting unit;
Described auxiliary source unit continues described first direct voltage to adopt described second direct voltage to power to described phase sequence detecting unit after voltage stabilizing becomes the second required direct voltage of described phase sequence detecting unit work.
Further, described device comprises that also input connects described auxiliary source unit, and output connects the voltage acquisition unit of second input of described central control unit;
Described voltage acquisition unit obtains the direct current after the unit rectification of described auxiliary source, and export to described central control unit after described direct current step-down is processed into the analog sampling value, after described central control unit converts its analog sampling value that receives to digital sample values, be converted into corresponding alternating voltage, afterwards, whether the described alternating voltage after described central control unit judgement converts is greater than preset upper limit value or less than default lower limit, and the described alternating voltage after judge converting is controlled described three phase mains by described phase sequence control unit and is stopped to described electrical load power supply during greater than preset upper limit value or less than default lower limit.
Further, described phase sequence detecting unit specifically comprises the first optocoupler VT1, the second optocoupler VT2, the anode of light-emitting diode connects the C phase voltage output of described three phase mains among the first optocoupler VT1 by resistance R 1, the negative electrode of light-emitting diode connects the A phase voltage output of described three phase mains among the first optocoupler VT1, and be parallel with diode D1 between the anode of light-emitting diode and the negative electrode among the first optocoupler VT1, the anode of diode D1 connects the negative electrode of light-emitting diode among the first optocoupler VT1; The anode of light-emitting diode connects the A phase voltage output of described three phase mains among the second optocoupler VT2 by resistance R 2, the negative electrode of light-emitting diode connects the B phase voltage output of described three phase mains among the second optocoupler VT2, and be parallel with diode D2 between the anode of light-emitting diode and the negative electrode among the second optocoupler VT2, the anode of diode D2 connects the negative electrode of light-emitting diode among the second optocoupler VT2;
The collector electrode of phototriode is as the direct voltage of the feeder ear reception+5V of described phase sequence detecting unit among the first optocoupler VT1, the emitter of phototriode connects the base stage of triode Q1 among the first optocoupler VT1 by resistance R 3, the grounded emitter of triode Q1, be connected with capacitor C 1 between the base stage of triode Q1 and the ground, the collector electrode of triode Q1 is by the feeder ear of resistance R 4 connection phase sequence detecting units 11, and the collector electrode of triode Q1 connects a first input end of described central control unit simultaneously; The collector electrode of phototriode connects the feeder ear of described phase sequence detecting unit among the second optocoupler VT2, the emitter of phototriode connects the base stage of triode Q2 among the second optocoupler VT2 by resistance R 5, the grounded emitter of triode Q2, be connected with capacitor C 2 between the base stage of triode Q2 and the ground, the collector electrode of triode Q2 is by the feeder ear of resistance R 6 connection phase sequence detecting units 11, and the collector electrode of triode Q2 connects another first input end of described central control unit simultaneously.
Further, described auxiliary source unit comprises:
The first power frequency pressure unit;
The second power frequency pressure unit;
The 3rd power frequency pressure unit;
First rectification unit, an one input connects the neutral line terminal in the described three phase mains, its another input connects A phase voltage output in the described three phase mains by the described first power frequency pressure unit, the negative output terminal ground connection of described first rectification unit, difference shunt capacitance C3 and capacitor C 4 between the positive output end of described first rectification unit and the negative output terminal, the positive output end of described first rectification unit connects the anode of diode D3 simultaneously, the negative electrode of diode D3 connects the input of pressurizer ZD1, the earth terminal ground connection of pressurizer ZD1, difference shunt capacitance C3 and capacitor C 6 between the output of pressurizer ZD1 and the ground, the output of pressurizer ZD1 connects the feeder ear of described phase sequence control unit simultaneously as an output of described auxiliary source unit, and to first direct voltage of described phase sequence control unit output+12V;
Second rectification unit, an one input connects the neutral line terminal in the described three phase mains, its another input connects B phase voltage output in the described three phase mains by the described second power frequency pressure unit, the negative output terminal ground connection of described second rectification unit, difference shunt capacitance C9 and capacitor C 10 between the positive output end of described second rectification unit and the negative output terminal, the positive output end of described second rectification unit connects the anode of diode D6 simultaneously, the minus earth of diode D6, the negative electrode of diode D6 connects the negative electrode of diode D3 simultaneously;
The 3rd rectification unit, an one input connects the neutral line terminal in the three phase mains, its another input connects C phase voltage output in the described three phase mains by described the 3rd power frequency pressure unit, the negative output terminal ground connection of described the 3rd rectification unit, difference shunt capacitance C11 and capacitor C 12 between the positive output end of described the 3rd rectification unit and the negative output terminal, the positive output end of described the 3rd rectification unit connects the anode of diode D8 simultaneously, the minus earth of diode D8, the negative electrode of diode D8 connects the negative electrode of diode D3 simultaneously.
Further, the output of pressurizer ZD1 also connects the input of pressurizer ZD2, the earth terminal ground connection of pressurizer ZD2, difference shunt capacitance C7 and capacitor C 8 between the output of pressurizer ZD2 and the ground, the output of voltage stabilizing organ pipe ZD2 connects the feeder ear of described phase sequence detecting unit simultaneously as another output of described auxiliary source unit, and to second direct voltage of described phase sequence detecting unit output+5V; The output of pressurizer ZD2 is by the anode of resistance R 8 connection light-emitting diode D5, the minus earth of light-emitting diode D5.
Further, described voltage acquisition unit specifically comprises:
Be series at positive output end and the resistance R between the ground 11 and the resistance R 14 of described first rectification unit, and an end of resistance R 11 connects the positive output end of described first rectification unit, the other end of resistance R 11 is simultaneously by capacitor C 13 ground connection;
Be series at positive output end and the resistance R between the ground 12 and the resistance R 15 of described second rectification unit, and an end of resistance R 12 connects the positive output end of described second rectification unit, the other end of resistance R 12 is simultaneously by capacitor C 14 ground connection;
Be series at positive output end and the resistance R between the ground 13 and the resistance R 16 of described the 3rd rectification unit, and an end of resistance R 13 connects the positive output end of described the 3rd rectification unit, the other end of resistance R 13 is simultaneously by capacitor C 15 ground connection;
The other end of the other end of the other end of resistance R 11, resistance R 12 and resistance R 13 connects second input of described central control unit respectively.
Further, described phase sequence control unit comprises three voltage output ends being connected to described three phase mains and three first contactors between the described electrical load corresponding port, and is connected to three voltage output ends of described three phase mains and three second contactors between the described electrical load corresponding port;
The coil two ends of described first contactor and the switch in parallel of relay J 1, one end of the coil of relay J 1 connects another output of described auxiliary source unit as the feeder ear of described phase sequence detecting unit, the other end of the coil of relay J 1 connects the collector electrode of triode Q3, the grounded emitter of triode Q3, the base stage of triode Q3 is by one first output of the described central control unit of resistance R 17 connections, and an end that links to each other with one first output described central control unit resistance R 17 is simultaneously by resistance R 18 ground connection;
The coil two ends of described second contactor and the switch in parallel of relay J 2, one end of the coil of relay J 2 connects another output of described auxiliary source unit as the feeder ear of described phase sequence detecting unit, the other end of the coil of relay J 2 connects the collector electrode of triode Q4, the grounded emitter of triode Q4, the base stage of triode Q4 is by another first output of the described central control unit of resistance R 19 connections, and the end that another first output resistance R 19 and described central control unit links to each other is simultaneously by resistance R 20 ground connection.
Further, described surge protection unit specifically comprises fuse F1 and the piezo-resistance RV4 that is series between A phase voltage output and the protective wire, be series at fuse F2 and piezo-resistance RV6 between B phase voltage output and the protective wire, be series at fuse F2 and piezo-resistance RV6 between C phase voltage output and the protective wire; The end of fuse F2 connects A phase voltage output, and the end of fuse F2 connects B phase voltage output, and the end of fuse F3 connects C phase voltage output;
Described surge protection unit also comprises the piezo-resistance RV1 between the other end of the other end that is connected in fuse F1 and fuse F2; be connected in the piezo-resistance RV2 between the other end of the other end of fuse F2 and fuse F3; be connected in the piezo-resistance RV3 between the other end of the other end of fuse F1 and fuse F3, and be series at fuse F4 and piezo-resistance RV7 between neutral line output and the protective wire.
The utility model embodiment adopts phase sequence detecting unit and central control unit to detect the phase sequence of the three phase mains of powering to electrical load, and phase sequence appears when opposite detecting this three phase mains, control the phase sequence of this three phase mains of adjustment by the phase sequence control unit to the electrical load power supply, avoid user's manual adjustment, saved the manpower financial capacity.
Description of drawings
Fig. 1 is the structure principle chart of the three phase mains protective device of the electrical load that provides of the utility model embodiment;
Fig. 2 is the physical circuit figure of phase sequence detecting unit among Fig. 1;
Fig. 3 is the physical circuit figure of auxiliary source unit among Fig. 1;
Fig. 4 is the physical circuit figure of voltage acquisition unit among Fig. 1;
Fig. 5 is the physical circuit figure of phase sequence control unit among Fig. 1;
Fig. 6 is the circuit diagram of surge protection unit in the three phase mains protective device of the electrical load that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment adopts phase sequence detecting unit and central control unit to detect the phase sequence of the three phase mains of powering to electrical load, and phase sequence appears when opposite detecting this three phase mains, control by the phase sequence control unit and adjust the phase sequence of this three phase mains to the electrical load power supply.
Fig. 1 shows the structural principle of the three phase mains protective device of the electrical load that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.
The three phase mains protective device of the electrical load that the utility model embodiment provides comprises central control unit 12; be connected in the phase sequence detecting unit 11 between the first input end of the voltage output end of three phase mains and central control unit 12, and be connected in the phase sequence control unit 15 between the power supply terminal of first output of central control unit 12 and electrical load.Wherein, phase sequence detecting unit 11 produces first pulse signal and/or second pulse signal according to three phase mains, and this first pulse signal and/or second pulse signal are sent to central control unit 12.Central control unit 12 judges whether to receive first pulse signal and/or second pulse signal that phase sequence detecting unit 11 sends, when central control unit 12 is judged when receiving first pulse signal that phase sequence detecting unit 11 sends and second pulse signal, calculate the time difference of the first pulse signal trailing edge time and the second pulse signal trailing edge time, and when this time difference during near first preset value of its storage, it is opposite to think that promptly phase sequence has appearred in this three phase mains, at this moment, adjust signal by first output of central control unit 12 to phase sequence control unit 15 output phase sequences.Phase sequence control unit 15 is adjusted signal according to this phase sequence, adjusts the phase sequence of this three phase mains to the electrical load power supply, so that three phase mains is powered to electrical load with adjusted phase sequence.When central control unit 12 is judged when receiving first pulse signal that phase sequence detecting unit 11 sends and second pulse signal, calculate the time difference of the first pulse signal trailing edge time and the second pulse signal trailing edge time, and when this time difference during near second preset value of its storage, it is opposite to think that promptly phase sequence does not appear in this three phase mains, at this moment, export control signals by first output of central control unit 12 to phase sequence control unit 15.Phase sequence control unit 15 is according to this control signal, and the control three phase mains is powered to electrical load with normal phase sequence.
Owing to adopted phase sequence detecting unit 11 and central control unit 12 to detect the phase sequence of the three phase mains of powering to electrical load, and phase sequence appears when opposite detecting this three phase mains, control the phase sequence of this three phase mains of adjustment by phase sequence control unit 15 to the electrical load power supply, avoid user's manual adjustment, saved the manpower financial capacity.
Wherein phase sequence detecting unit 11 and/or phase sequence control unit 15 both can adopt externally fed, also can adopt in-line power.When phase sequence control unit 15 adopts in-line power; the three phase mains protective device of the electrical load that the utility model embodiment provides also further comprises auxiliary source unit 13; its input connects the voltage output end of above-mentioned three phase mains; an one output connects the feeder ear of phase sequence control unit 15; the alternating current of the 13 pairs of three phase mains outputs in auxiliary source unit carries out the power frequency step-down to be handled; and after the AC rectification after the power frequency step-down handled becomes direct current; after voltage stabilizing becomes the first required direct voltage of phase sequence control unit 15 work, adopt this first direct voltage to 15 power supplies of phase sequence control unit.Further, another output of auxiliary source unit 13 connects the feeder ear of phase sequence detecting unit 11, auxiliary source unit 13 can also continue this first direct voltage to adopt this second direct voltage to 11 power supplies of phase sequence detecting unit after voltage stabilizing becomes the second required direct voltage of phase sequence detecting unit 11 work, certainly, when phase sequence control unit 15 adopts externally fed, after auxiliary source unit 13 also can become direct current with the AC rectification of Industrial Frequency Transformer step-down output, directly voltage stabilizing becomes the second required direct voltage of phase sequence detecting unit 11 work, adopts this second direct voltage to 11 power supplies of phase sequence detecting unit afterwards.
Further, the three phase mains protective device of the electrical load that the utility model embodiment provides can also comprise that input connects auxiliary source unit 13, and output connects the voltage acquisition unit 14 of second input of central control unit 12.Voltage acquisition unit 14 obtains the direct current after 13 rectifications of auxiliary source unit, and exports to central control unit 12 after this direct current step-down is processed into the analog sampling value.Central control unit 12 is converted into corresponding alternating voltage after converting its analog sampling value that receives to digital sample values.Afterwards, whether the alternating voltage after central control unit 12 judgements convert is greater than preset upper limit value or less than default lower limit, and the alternating voltage after judge converting stops to power to electrical load by the above-mentioned three phase mains of phase sequence control unit 15 controls during greater than preset upper limit value or less than default lower limit.When central control unit 12 judges that alternating voltage after converting is not greater than preset upper limit value or less than default lower limit, then be failure to actuate or begin to power to electrical load by the above-mentioned three phase mains of phase sequence control unit 15 controls.
In addition; the three phase mains protective device of the electrical load that provides for the ease of the utility model embodiment can also comprise the display unit 16 of second output that connects central control unit 12, display unit 16 can show that central control unit 12 receives, storage or handle after any data.For example, central control unit 12 can show by display unit 16 after the analog sampling value that it is received is converted into corresponding alternating voltage; Central control unit 12 can show first pulse signal that it receives and/or second pulse signal, its time difference that calculates, with and the three phase mains judged to the whether opposite result of the phase sequence of electrical load power supply etc.In addition, when central control unit 12 is judged when not receiving first pulse signal that phase sequence detecting unit 11 sends and/or second pulse signal, judge that promptly phase shortage has appearred in above-mentioned three phase mains, at this moment, also the judged result of this phase shortage can be shown by display unit 16, in time deal with the prompting user.
Fig. 2 shows the physical circuit of phase sequence detecting unit 11 among Fig. 1, for convenience of explanation, only shows the part relevant with the utility model embodiment.
Phase sequence detecting unit 11 specifically comprises the first optocoupler VT1, the second optocoupler VT2, the anode of light-emitting diode connects the C phase voltage output of three phase mains among the first optocoupler VT1 by resistance R 1, the negative electrode of light-emitting diode connects the A phase voltage output of three phase mains among the first optocoupler VT1, and be parallel with diode D1 between the anode of light-emitting diode and the negative electrode among the first optocoupler VT1, the anode of diode D1 connects the negative electrode of light-emitting diode among the first optocoupler VT1; The anode of light-emitting diode connects the A phase voltage output of three phase mains among the second optocoupler VT2 by resistance R 2, the negative electrode of light-emitting diode connects the B phase voltage output of three phase mains among the second optocoupler VT2, and be parallel with diode D2 between the anode of light-emitting diode and the negative electrode among the second optocoupler VT2, the anode of diode D2 connects the negative electrode of light-emitting diode among the second optocoupler VT2.The collector electrode of phototriode is as the direct voltage of the feeder ear reception+5V of phase sequence detecting unit 11 among the first optocoupler VT1, the emitter of phototriode connects the base stage of triode Q1 among the first optocoupler VT1 by resistance R 3, the grounded emitter of triode Q1, be connected with capacitor C 1 between the base stage of triode Q1 and the ground, the collector electrode of triode Q1 is by the feeder ear of resistance R 4 connection phase sequence detecting units 11, and the collector electrode of triode Q1 connects a first input end of central control unit 12 simultaneously; The collector electrode of phototriode connects the feeder ear of phase sequence detecting unit 11 among the second optocoupler VT2, the emitter of phototriode connects the base stage of triode Q2 among the second optocoupler VT2 by resistance R 5, the grounded emitter of triode Q2, be connected with capacitor C 2 between the base stage of triode Q2 and the ground, the collector electrode of triode Q2 is by the feeder ear of resistance R 6 connection phase sequence detecting units 11, and the collector electrode of triode Q2 connects another first input end of central control unit 12 simultaneously.
Wherein, the first optocoupler VT1 and the second optocoupler VT2 choose LTV-816S, as resistance R 3=resistance R 5=2K, during resistance R 1=resistance R 2=150K, its secondary current IC=(5-0.3-0.7)/2K=2mA, its primary current IF=380/150K=2.53mA, can get the current transfer ratio CTR of LTV-816S when IF is 2.53mA by tabling look-up be about 120, when the derate of choosing 70%, 120%*70%=84%, and among the utility model embodiment, IC/IF=79% is less than 84%, therefore, the first optocoupler VT1 and the second optocoupler VT2 choose LTV-816S, and resistance R 3 and resistance R 5 are chosen 2K, and it is rational that resistance R 1 and resistance R 2 are chosen 150K.
When 11 pairs of three phase mains of phase sequence detecting unit detect, if A phase voltage, the B phase voltage, the C phase voltage phase shortage do not occur and phase sequence do not occur opposite, then in the positive half period of CA phase voltage, phototriode conducting among the first optocoupler VT1, and then make triode Q1 conducting, the current collection of triode Q1 is low level signal very, in the negative half-cycle of CA phase voltage, phototriode ends among the first optocoupler VT1, and then make triode Q1 end, the current collection of triode Q1 is high level signal very, that is to say, it is 50% first pulse signal that triode Q1 imports a duty ratio by collector electrode to a first input end of phase sequence detecting unit 11; In like manner, to import a duty ratio by collector electrode to another first input end of phase sequence detecting unit 11 be 50% second pulse signal to triode Q2.Central control unit 12 calculates the time difference of these the first pulse signal trailing edge times and the second pulse signal trailing edge time, and when this time difference during near first preset value of its storage, it is opposite to think that promptly phase sequence has appearred in this three phase mains; When this time difference during near second preset value of its storage, it is opposite to think that promptly phase sequence does not appear in this three phase mains.For example, for China 50HZ power frequency three phase mains, the cycle of first pulse signal and second pulse signal is specially 20ms, when time difference that central control unit 12 calculates these the first pulse signal trailing edge times and the second pulse signal trailing edge time during near 13.3ms, when promptly first preset value was 13.3ms, it was opposite to think that phase sequence has appearred in this three phase mains; When time difference that control unit 12 calculates these the first pulse signal trailing edge times and the second pulse signal trailing edge time during near 6.6ms, when promptly second preset value was 6.6ms, it was opposite to think that phase sequence does not appear in this three phase mains.And when central control unit 12 does not receive first pulse signal and/or second pulse signal, think that promptly phase shortage has appearred in this three phase mains.
Fig. 3 shows the physical circuit of auxiliary source unit 13 among Fig. 1, for convenience of explanation, only shows the part relevant with the utility model embodiment.
Auxiliary source unit 13 comprises first rectification unit 132, an one input connects the neutral line terminal in the three phase mains, the A phase voltage output that another input of first rectification unit 132 connects in the three phase mains by the first power frequency pressure unit 131, the negative output terminal ground connection of first rectification unit 132, difference shunt capacitance C3 and capacitor C 4 between the positive output end of first rectification unit 132 and the negative output terminal, the positive output end of first rectification unit 132 connects the anode of diode D3 simultaneously, the negative electrode of diode D3 connects the input Vin of pressurizer ZD1, the earth terminal GND ground connection of pressurizer ZD1, difference shunt capacitance C3 and capacitor C 6 between the output end vo ut of pressurizer ZD1 and the ground, the output end vo ut of pressurizer ZD1 connects the feeder ear of phase sequence control unit 15 simultaneously as an output of auxiliary source unit 13, and to first direct voltage of phase sequence control unit 15 output+12V.
Influence the power supply of phase sequence control unit 15 for fear of A phase phase shortage, the auxiliary source unit 13 that the utility model embodiment provides can also comprise second rectification unit 134.An input of second rectification unit 134 connects the neutral line terminal in the three phase mains, the B phase voltage output that another input of first rectification unit 134 connects in the three phase mains by the second power frequency pressure unit 133, the negative output terminal ground connection of second rectification unit 134, difference shunt capacitance C9 and capacitor C 10 between the positive output end of second rectification unit 134 and the negative output terminal, the positive output end of second rectification unit 134 connects the anode of diode D6 simultaneously, the minus earth of diode D6.The negative electrode of diode D6 connects the negative electrode of diode D3 simultaneously, even during proper A phase phase shortage, auxiliary source unit 13 still can utilize the B phase voltage to provide 15 work of phase sequence control unit required electric energy.
In order further to avoid A phase and the influence of B phase shortage mutually to the power supply of phase sequence control unit 15, the auxiliary source unit 13 that the utility model embodiment provides can also comprise the 3rd rectification unit 136.An input of the 3rd rectification unit 136 connects the neutral line terminal in the three phase mains, the C phase voltage output that another input of the 3rd rectification unit 136 connects in the three phase mains by the 3rd power frequency pressure unit 135, the negative output terminal ground connection of the 3rd rectification unit 136, difference shunt capacitance C11 and capacitor C 12 between the positive output end of the 3rd rectification unit 136 and the negative output terminal, the positive output end of the 3rd rectification unit 136 connects the anode of diode D8 simultaneously, the minus earth of diode D8.The negative electrode of diode D8 connects the negative electrode of diode D3 simultaneously, even proper A mutually and B mutually during phase shortage, auxiliary source unit 13 still can utilize the C phase voltage that the phase sequence control unit 15 required electric energy of working is provided.
In addition, in order to point out the phase shortage situation of each phase of user's three phase mains more intuitively, among the utility model embodiment, the positive output end of first rectification unit 132 connects the anode of light-emitting diode D4, and the negative electrode of light-emitting diode D4 is by resistance R 7 ground connection; The positive output end of second rectification unit 134 connects the anode of light-emitting diode D7, and the negative electrode of light-emitting diode D7 is by resistance R 9 ground connection; The positive output end of the 3rd rectification unit 136 connects the anode of light-emitting diode D9, and the negative electrode of light-emitting diode D9 is by resistance R 10 ground connection.
When auxiliary source unit 13 also further when phase sequence detecting unit 11 is powered, in the auxiliary source unit 13, the output end vo ut of pressurizer ZD1 also connects the input Vin of pressurizer ZD2, the earth terminal GND ground connection of pressurizer ZD2, difference shunt capacitance C7 and capacitor C 8 between the output end vo ut of pressurizer ZD2 and the ground, the output end vo ut of voltage stabilizing organ pipe ZD2 connects the feeder ear of phase sequence detecting unit 11 simultaneously as another output of auxiliary source unit 13, and to second direct voltage of phase sequence detecting unit 11 output+5V.
At this moment, in order to judge the operating state of pressurizer ZD1 and pressurizer ZD2 in conjunction with diode D4, among the utility model embodiment, the output end vo ut of pressurizer ZD2 can also connect the anode of light-emitting diode D5, the minus earth of light-emitting diode D5 by resistance R 8.
More specifically, when work in auxiliary source unit 13, the first power frequency pressure unit 131 becomes the 14V alternating voltage with the step-down of A phase voltage, and the second power frequency pressure unit 133 becomes the 14V alternating voltage with the step-down of B phase voltage, and the 3rd power frequency pressure unit 135 becomes the 14V alternating voltage with the step-down of C phase voltage.The appearance value of capacitor C 3, capacitor C 9 and capacitor C 11 all adopts 1mF.First rectification unit 132, second rectification unit 134 and the 3rd rectification unit 136 are selected the rectifier bridge GBL08E3 of 800V/4A respectively for use, this is because the internal resistance of power frequency pressure unit is very little, cause the 14V alternating current at powered on moment, produce bigger impulse current, according to measured result, this impulse current is 11A to the maximum, about 3ms of duration, and the maximum impact electric current of rectifier bridge GBL08E3 can reach 150A, and the duration is 8.3ms, meets the demands.In addition, pressurizer ZD1 specifically adopts MC7812, and pressurizer ZD2 specifically adopts MC7805, and then the voltage max of 14V alternating current behind rectifying and wave-filtering is 14*1.3*1.414*0.9=23.18V, and the maximum input voltage 25V less than pressurizer MC7812 meets the demands.
Fig. 4 shows the physical circuit of voltage acquisition unit 14 among Fig. 1, for convenience of explanation, only shows the part relevant with the utility model embodiment.
In the voltage acquisition unit 14, resistance R 11 and resistance R 14 are series between the positive output end and ground of first rectification unit 132, and an end of resistance R 11 connects the positive output end of first rectification unit 132, and the other end of resistance R 11 is simultaneously by capacitor C 13 ground connection; Resistance R 12 and resistance R 15 are series between the positive output end and ground of second rectification unit 134, and an end of resistance R 12 connects the positive output end of second rectification unit 134, and the other end of resistance R 12 is simultaneously by capacitor C 14 ground connection; Resistance R 13 and resistance R 16 are series between the positive output end and ground of the 3rd rectification unit 136, and an end of resistance R 13 connects the positive output end of the 3rd rectification unit 136, and the other end of resistance R 13 is simultaneously by capacitor C 15 ground connection.The other end of the other end of the other end of resistance R 11, resistance R 12 and resistance R 13 connects second input of central control unit 12 respectively.
Voltage acquisition unit 14 is when work, the direct voltage of sampling behind auxiliary source unit 13 rectifying and wave-filterings, because this voltage is generally tens volts, can not directly import chip as central control unit 12, need through after two divider resistance dividing potential drops, step-down becomes below the 5V, delivers to second input of central control unit 12 again.Wherein, resistance R 11, resistance R 12 and resistance R 13 value 10K respectively; Resistance R 14, resistance R 15 and resistance R 16 be value 4.2K respectively.
Fig. 5 shows the physical circuit of phase sequence control unit 15 among Fig. 1, for convenience of explanation, only shows the part relevant with the utility model embodiment.
Phase sequence control unit 15 among the utility model embodiment is by the break-make of control connection at the voltage output end and the contactor between the electrical load of three phase mains, realizes whether electrical load is switched on, and the adjustment of three phase mains power supply phase sequence.Particularly, phase sequence control unit 15 comprises three voltage output ends being connected to three phase mains and three first contactors between the electrical load corresponding port, be connected to three voltage output ends of three phase mains and three second contactors between the electrical load corresponding port, the structure of three first contactors and all identical with the annexation of other circuit, the structure of three second contactors and all identical with the annexation of other circuit, for the ease of understanding, only show one first contactor 151 and one second contactor 152 among Fig. 5.
The coil two ends of first contactor 151 and the switch in parallel of relay J 1, one end of the coil of relay J 1 connects another output of auxiliary source unit 13 as the feeder ear of phase sequence detecting unit 11, the other end of the coil of relay J 1 connects the collector electrode of triode Q3, the grounded emitter of triode Q3, the base stage of triode Q3 is by one first output of resistance R 17 connection central control units 12, and an end that links to each other with one first output central control unit 12 resistance R 17 is simultaneously by resistance R 18 ground connection.The coil two ends of second contactor 152 and the switch in parallel of relay J 2, one end of the coil of relay J 2 connects another output of auxiliary source unit 13 as the feeder ear of phase sequence detecting unit 11, the other end of the coil of relay J 2 connects the collector electrode of triode Q4, the grounded emitter of triode Q4, the base stage of triode Q4 is by another first output of resistance R 19 connection central control units 12, and the end that another first output resistance R 19 and central control unit 12 links to each other is simultaneously by resistance R 20 ground connection.
The interference of the induced voltage that generates when the outage for fear of the coil of relay J 1 and relay J 2, among the utility model embodiment, the coil two ends of the relay J 1 diode D10 that is connected in parallel, the negative electrode of diode D10 connects an end that is connected with auxiliary source unit 13 another outputs of the coil of relay J 1.The two ends of the coil of the relay J 2 diode D11 that is connected in parallel, the negative electrode of diode D11 connects an end that is connected with another output auxiliary source unit 13 coil of relay J 2.
Judge three phase mains when central control unit 12 and phase sequence do not occur when opposite, central control unit 12 is exported the high level signal of predesigned order as control signal by one first output, this high level signal is by the conducting order of three triode Q3 of control, then control the closing order of the switch of three first contactors 151, power to electrical load with normal phase sequence with the control three phase mains.Judge three phase mains when central control unit 12 and phase sequence occurs when opposite, central control unit 12 is adjusted signal by the high level signal of another first output output predesigned order as phase sequence, this high level signal is by the conducting order of three triode Q4 of control, then control the closing order of the switch of three second contactors 152, so that three phase mains is powered to electrical load with adjusted phase sequence.
Because the three phase mains end of incoming cables is easy to generate surge voltage when thunderbolt or connection disconnection heavy load; cause damage to electrical load; for this reason; the utility model embodiment provides the surge protection that electrical load is protected unit; show the circuit of surge protection unit in the three phase mains protective device of the electrical load that the utility model embodiment provides as Fig. 6; for convenience of explanation, only show the part relevant with the utility model embodiment.
This surge protection unit specifically comprises fuse F1 and the piezo-resistance RV4 that is series between A phase voltage output and the protective wire; be series at fuse F2 and piezo-resistance RV6 between B phase voltage output and the protective wire, be series at fuse F2 and piezo-resistance RV6 between C phase voltage output and the protective wire.Wherein, the end of fuse F2 connects A phase voltage output, and the end of fuse F2 connects B phase voltage output, and the end of fuse F3 connects C phase voltage output.This surge protection unit specifically also comprises the piezo-resistance RV1 between the other end of the other end that is connected in fuse F1 and fuse F2; be connected in the piezo-resistance RV2 between the other end of the other end of fuse F2 and fuse F3, be connected in the piezo-resistance RV3 between the other end of the other end of fuse F1 and fuse F3.In addition, this surge protection unit specifically can further include fuse F4 and the piezo-resistance RV7 that is series between neutral line output and the protective wire.
Wherein, because the crest voltage in the three-phase end of incoming cables is 380*1.31*1.414=698V, voltage between each phase is 220*1.3*1.414=404V, therefore, piezo-resistance RV1, piezo-resistance RV2 and piezo-resistance RV3 adopt the piezo-resistance of 820V respectively, piezo-resistance RV4, piezo-resistance RV5 and piezo-resistance RV6 adopt the piezo-resistance of 620V respectively, and piezo-resistance RV7 adopts the piezo-resistance of 421V.The thunderbolt experiment shows that this circuit can bear the ability 6KV/3KA of the mixing ripple of 1.2/50uS+8/20uS.
The utility model embodiment adopts phase sequence detecting unit and central control unit to detect the phase sequence of the three phase mains of powering to electrical load, and phase sequence appears when opposite detecting this three phase mains, control the phase sequence of this three phase mains of adjustment by the phase sequence control unit to the electrical load power supply, avoid user's manual adjustment, saved the manpower financial capacity; Have again, can also provide internal electric source to phase sequence detecting unit and/or phase sequence control unit by the auxiliary source unit; Have again, can also obtain direct current after the rectification of auxiliary source unit by voltage acquisition unit, and be converted into alternating current according to this direct current by central control unit, and show by display unit, this display unit also shows any data after central control unit receives, stores or handles simultaneously, and is convenient for users to use.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. the three phase mains protective device of an electrical load is characterized in that, described device comprises:
Store the central control unit of first preset value;
Be connected in the phase sequence detecting unit between the first input end of the voltage output end of three phase mains and described central control unit, described phase sequence detecting unit produces first pulse signal and/or second pulse signal according to described three phase mains, and described first pulse signal and/or second pulse signal sent to described central control unit, described central control unit judges whether to receive first pulse signal and/or second pulse signal that described phase sequence detecting unit sends, judge when receiving first pulse signal that described phase sequence detecting unit sends and second pulse signal when described central control unit, calculate the time difference of described first pulse signal trailing edge time and the described second pulse signal trailing edge time; And
Be connected in the phase sequence control unit between the power supply terminal of first output of described central control unit and electrical load, described central control unit is in described time difference during near described first preset value, first output by described central control unit is adjusted signal to described phase sequence control unit output phase sequence, described phase sequence control unit is adjusted signal according to described phase sequence, adjusts the phase sequence of described three phase mains to the electrical load power supply.
2. the three phase mains protective device of electrical load as claimed in claim 1, it is characterized in that, described device also comprises the auxiliary source unit, the input of described auxiliary source unit connects the voltage output end of described three phase mains, and an output of described auxiliary source unit connects the feeder ear of described phase sequence control unit;
Described auxiliary source unit carries out power frequency step-down processing to the alternating current of described three phase mains output, and after the AC rectification after described power frequency step-down handled becomes direct current, voltage stabilizing becomes the first required direct voltage of described phase sequence control unit work, adopts described first direct voltage to power to described phase sequence control unit afterwards.
3. the three phase mains protective device of electrical load as claimed in claim 2 is characterized in that, another output of described auxiliary source unit connects the feeder ear of described phase sequence detecting unit;
Described auxiliary source unit continues described first direct voltage to adopt described second direct voltage to power to described phase sequence detecting unit after voltage stabilizing becomes the second required direct voltage of described phase sequence detecting unit work.
4. the three phase mains protective device of electrical load as claimed in claim 3 is characterized in that, described device comprises that also input connects described auxiliary source unit, and output connects the voltage acquisition unit of second input of described central control unit;
Described voltage acquisition unit obtains the direct current after the unit rectification of described auxiliary source, and export to described central control unit after described direct current step-down is processed into the analog sampling value, after described central control unit converts its analog sampling value that receives to digital sample values, be converted into corresponding alternating voltage, afterwards, whether the described alternating voltage after described central control unit judgement converts is greater than preset upper limit value or less than default lower limit, and the described alternating voltage after judge converting is controlled described three phase mains by described phase sequence control unit and is stopped to described electrical load power supply during greater than preset upper limit value or less than default lower limit.
5. the three phase mains protective device of electrical load as claimed in claim 4, it is characterized in that, described phase sequence detecting unit specifically comprises the first optocoupler VT1, the second optocoupler VT2, the anode of light-emitting diode connects the C phase voltage output of described three phase mains among the first optocoupler VT1 by resistance R 1, the negative electrode of light-emitting diode connects the A phase voltage output of described three phase mains among the first optocoupler VT1, and be parallel with diode D1 between the anode of light-emitting diode and the negative electrode among the first optocoupler VT1, the anode of diode D1 connects the negative electrode of light-emitting diode among the first optocoupler VT1; The anode of light-emitting diode connects the A phase voltage output of described three phase mains among the second optocoupler VT2 by resistance R 2, the negative electrode of light-emitting diode connects the B phase voltage output of described three phase mains among the second optocoupler VT2, and be parallel with diode D2 between the anode of light-emitting diode and the negative electrode among the second optocoupler VT2, the anode of diode D2 connects the negative electrode of light-emitting diode among the second optocoupler VT2;
The collector electrode of phototriode is as the direct voltage of the feeder ear reception+5V of described phase sequence detecting unit among the first optocoupler VT1, the emitter of phototriode connects the base stage of triode Q1 among the first optocoupler VT1 by resistance R 3, the grounded emitter of triode Q1, be connected with capacitor C 1 between the base stage of triode Q1 and the ground, the collector electrode of triode Q1 is by the feeder ear of resistance R 4 connection phase sequence detecting units (11), and the collector electrode of triode Q1 connects a first input end of described central control unit simultaneously; The collector electrode of phototriode connects the feeder ear of described phase sequence detecting unit among the second optocoupler VT2, the emitter of phototriode connects the base stage of triode Q2 among the second optocoupler VT2 by resistance R 5, the grounded emitter of triode Q2, be connected with capacitor C 2 between the base stage of triode Q2 and the ground, the collector electrode of triode Q2 is by the feeder ear of resistance R 6 connection phase sequence detecting units (11), and the collector electrode of triode Q2 connects another first input end of described central control unit simultaneously.
6. the three phase mains protective device of electrical load as claimed in claim 5 is characterized in that, described auxiliary source unit comprises:
The first power frequency pressure unit;
The second power frequency pressure unit;
The 3rd power frequency pressure unit;
First rectification unit, an one input connects the neutral line terminal in the described three phase mains, its another input connects A phase voltage output in the described three phase mains by the described first power frequency pressure unit, the negative output terminal ground connection of described first rectification unit, difference shunt capacitance C3 and capacitor C 4 between the positive output end of described first rectification unit and the negative output terminal, the positive output end of described first rectification unit connects the anode of diode D3 simultaneously, the negative electrode of diode D3 connects the input of pressurizer ZD1, the earth terminal ground connection of pressurizer ZD1, difference shunt capacitance C3 and capacitor C 6 between the output of pressurizer ZD1 and the ground, the output of pressurizer ZD1 connects the feeder ear of described phase sequence control unit simultaneously as an output of described auxiliary source unit, and to first direct voltage of described phase sequence control unit output+12V;
Second rectification unit, an one input connects the neutral line terminal in the described three phase mains, its another input connects B phase voltage output in the described three phase mains by the described second power frequency pressure unit, the negative output terminal ground connection of described second rectification unit, difference shunt capacitance C9 and capacitor C 10 between the positive output end of described second rectification unit and the negative output terminal, the positive output end of described second rectification unit connects the anode of diode D6 simultaneously, the minus earth of diode D6, the negative electrode of diode D6 connects the negative electrode of diode D3 simultaneously;
The 3rd rectification unit, an one input connects the neutral line terminal in the three phase mains, its another input connects C phase voltage output in the described three phase mains by described the 3rd power frequency pressure unit, the negative output terminal ground connection of described the 3rd rectification unit, difference shunt capacitance C11 and capacitor C 12 between the positive output end of described the 3rd rectification unit and the negative output terminal, the positive output end of described the 3rd rectification unit connects the anode of diode D8 simultaneously, the minus earth of diode D8, the negative electrode of diode D8 connects the negative electrode of diode D3 simultaneously.
7. the three phase mains protective device of electrical load as claimed in claim 6, it is characterized in that, the output of pressurizer ZD1 also connects the input of pressurizer ZD2, the earth terminal ground connection of pressurizer ZD2, difference shunt capacitance C7 and capacitor C 8 between the output of pressurizer ZD2 and the ground, the output of voltage stabilizing organ pipe ZD2 connects the feeder ear of described phase sequence detecting unit simultaneously as another output of described auxiliary source unit, and to second direct voltage of described phase sequence detecting unit output+5V; The output of pressurizer ZD2 is by the anode of resistance R 8 connection light-emitting diode D5, the minus earth of light-emitting diode D5.
8. the three phase mains protective device of electrical load as claimed in claim 7 is characterized in that, described voltage acquisition unit specifically comprises:
Be series at positive output end and the resistance R between the ground 11 and the resistance R 14 of described first rectification unit, and an end of resistance R 11 connects the positive output end of described first rectification unit, the other end of resistance R 11 is simultaneously by capacitor C 13 ground connection;
Be series at positive output end and the resistance R between the ground 12 and the resistance R 15 of described second rectification unit, and an end of resistance R 12 connects the positive output end of described second rectification unit, the other end of resistance R 12 is simultaneously by capacitor C 14 ground connection;
Be series at positive output end and the resistance R between the ground 13 and the resistance R 16 of described the 3rd rectification unit, and an end of resistance R 13 connects the positive output end of described the 3rd rectification unit, the other end of resistance R 13 is simultaneously by capacitor C 15 ground connection;
The other end of the other end of the other end of resistance R 11, resistance R 12 and resistance R 13 connects second input of described central control unit respectively.
9. the three phase mains protective device of electrical load as claimed in claim 8, it is characterized in that, described phase sequence control unit comprises three voltage output ends being connected to described three phase mains and three first contactors between the described electrical load corresponding port, and is connected to three voltage output ends of described three phase mains and three second contactors between the described electrical load corresponding port;
The coil two ends of described first contactor and the switch in parallel of relay J 1, one end of the coil of relay J 1 connects another output of described auxiliary source unit as the feeder ear of described phase sequence detecting unit, the other end of the coil of relay J 1 connects the collector electrode of triode Q3, the grounded emitter of triode Q3, the base stage of triode Q3 is by one first output of the described central control unit of resistance R 17 connections, and an end that links to each other with one first output described central control unit resistance R 17 is simultaneously by resistance R 18 ground connection;
The coil two ends of described second contactor and the switch in parallel of relay J 2, one end of the coil of relay J 2 connects another output of described auxiliary source unit as the feeder ear of described phase sequence detecting unit, the other end of the coil of relay J 2 connects the collector electrode of triode Q4, the grounded emitter of triode Q4, the base stage of triode Q4 is by another first output of the described central control unit of resistance R 19 connections, and the end that another first output resistance R 19 and described central control unit links to each other is simultaneously by resistance R 20 ground connection.
10. the three phase mains protective device of electrical load as claimed in claim 9, it is characterized in that, described surge protection unit specifically comprises fuse F1 and the piezo-resistance RV4 that is series between A phase voltage output and the protective wire, be series at fuse F2 and piezo-resistance RV6 between B phase voltage output and the protective wire, be series at fuse F2 and piezo-resistance RV6 between C phase voltage output and the protective wire; The end of fuse F2 connects A phase voltage output, and the end of fuse F2 connects B phase voltage output, and the end of fuse F3 connects C phase voltage output;
Described surge protection unit also comprises the piezo-resistance RV1 between the other end of the other end that is connected in fuse F1 and fuse F2; be connected in the piezo-resistance RV2 between the other end of the other end of fuse F2 and fuse F3; be connected in the piezo-resistance RV3 between the other end of the other end of fuse F1 and fuse F3, and be series at fuse F4 and piezo-resistance RV7 between neutral line output and the protective wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202059409U CN201541118U (en) | 2009-10-19 | 2009-10-19 | Three-phase power protecting device of power load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202059409U CN201541118U (en) | 2009-10-19 | 2009-10-19 | Three-phase power protecting device of power load |
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| CN201541118U true CN201541118U (en) | 2010-08-04 |
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| CN2009202059409U Expired - Fee Related CN201541118U (en) | 2009-10-19 | 2009-10-19 | Three-phase power protecting device of power load |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364796A (en) * | 2011-10-10 | 2012-02-29 | 江苏新日丹顿电气有限公司 | Voltage and phase sequence protection circuit |
| CN102455390A (en) * | 2010-10-27 | 2012-05-16 | 约克（无锡）空调冷冻设备有限公司 | Phase sequence detection circuit, control board and phase sequence protection device |
| CN102944760A (en) * | 2012-10-17 | 2013-02-27 | 中色科技股份有限公司 | Simple and easy phase sequence test method of three-phase alternating current |
| CN105067884A (en) * | 2015-08-25 | 2015-11-18 | 上海华兴数字科技有限公司 | Three-phase alternating-current supply phase detection circuit |
| CN106196500A (en) * | 2016-08-11 | 2016-12-07 | 合肥通用电源设备有限公司 | A kind of air conditioning unit control method based on power supply changeover device |
| CN106546832A (en) * | 2016-12-08 | 2017-03-29 | 珠海格力电器股份有限公司 | A kind of detection means and its using method of three phase mains |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
| CN112769363A (en) * | 2020-12-30 | 2021-05-07 | 四川工商学院 | Fire monitor motor drive and protection circuit |
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2009
- 2009-10-19 CN CN2009202059409U patent/CN201541118U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455390A (en) * | 2010-10-27 | 2012-05-16 | 约克（无锡）空调冷冻设备有限公司 | Phase sequence detection circuit, control board and phase sequence protection device |
| CN102364796A (en) * | 2011-10-10 | 2012-02-29 | 江苏新日丹顿电气有限公司 | Voltage and phase sequence protection circuit |
| CN102944760A (en) * | 2012-10-17 | 2013-02-27 | 中色科技股份有限公司 | Simple and easy phase sequence test method of three-phase alternating current |
| CN105067884A (en) * | 2015-08-25 | 2015-11-18 | 上海华兴数字科技有限公司 | Three-phase alternating-current supply phase detection circuit |
| CN106196500A (en) * | 2016-08-11 | 2016-12-07 | 合肥通用电源设备有限公司 | A kind of air conditioning unit control method based on power supply changeover device |
| CN106546832A (en) * | 2016-12-08 | 2017-03-29 | 珠海格力电器股份有限公司 | A kind of detection means and its using method of three phase mains |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
| CN112769363A (en) * | 2020-12-30 | 2021-05-07 | 四川工商学院 | Fire monitor motor drive and protection circuit |
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Owner name: SHENZHEN ISUWEL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHONG KAIJIAN Effective date: 20111018 Free format text: FORMER OWNER: SHEN DALI ZHOU LUOJUN |
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