CN103208782B - The comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity - Google Patents
The comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity Download PDFInfo
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Abstract
The invention discloses comprehensive detection and the Protector for using electricity of a kind of power frequency and variable frequency power supply, comprise current detecting change-over circuit, precision rectifying filter circuit, signal processing circuit, fault-signal process warning circuit, time control circuit and system start control circuit, described current detecting change-over circuit detects frequency conversion or power frequency supply signal, the voltage signal being converted to same frequency exports to precision rectifying filter circuit, signal after rectifying and wave-filtering is exported to signal processing circuit by described precision rectifying filter circuit, signal after process is exported to failure alarm circuit by signal processing circuit, system starts the signal input part of control circuit and is connected with the operation detection power supply of frequency converter, signal output part connects the power control terminal of each circuit.The present invention can carry out comparatively accurate circuit protection to power supply, adapts to multiple electric equipment working frequency range, makes user grasp faulty circuit situation in the very first time, carry out repair and maintenance to power consumption equipment power supply.
Description
Technical field
The present invention relates to a kind of apparatus for protecting power supply, particularly relate to comprehensive detection and the Protector for using electricity of a kind of power frequency and variable frequency power supply.
Background technology
At present; the protective device that runs under mostly being power frequency state of electric circuit inspection and protection device on the market; when power supply changes frequency; especially at high frequencies a lot of protection device just there will be misoperation and even occurs damage and fault; and the thermal overload protection device that can adapt to different frequency is accurate and sensitive not, accuracy of detection is lower, adapts to current range little; failure rate is also higher, and existing equipment does not reach precision equipment or the protection requirement to the higher circuit of circuit protection requirement.
Summary of the invention
The object of this invention is to provide comprehensive detection and the Protector for using electricity of a kind of power frequency and variable frequency power supply, comparatively accurate power protection can be carried out.
The present invention adopts following technical proposals: the comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity, comprise current detecting change-over circuit, precision rectifying filter circuit, signal processing circuit, fault-signal process warning circuit, time control circuit and system start control circuit, described current detecting change-over circuit detects variable frequency power supply or power frequency supply signal, the voltage signal being converted to same frequency exports to precision rectifying filter circuit, signal after rectifying and wave-filtering is exported to signal processing circuit by described precision rectifying filter circuit, signal after process is exported to fault-signal process warning circuit by signal processing circuit, system starts the signal input part of control circuit and is connected with the operation detection power supply of frequency converter or power frequency supply, signal output part connects the power control terminal of each circuit, described current detecting change-over circuit, precision rectifying filter circuit and signal processing circuit are at least one road.
Described current signal tesing and switching circuit, the rectification of precision rectifying filter circuit, signal transacting are three tunnels, detect the three phase mains of variable frequency power supply respectively.
Described current detecting change-over circuit comprises current detecting chip, the electric current detected is connected with current detecting chip input, export from the output of current detecting chip, two power ends of current detecting chip connect two power end+15V ,-15V of two constant voltage dc source respectively by current-limiting resistance R102, R103; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit through current-limiting resistance R101 and filter capacitor C24.
Described precision rectifying filter circuit comprises the first amplifier and the second amplifier, the inverting input of the first described amplifier connects current-limiting resistance R101 by current-limiting resistance R104, the in-phase input end of the first amplifier is by resistance R170 ground connection, the first Schottky diode D101 is connected with between the output of the first amplifier and inverting input, the output of the first amplifier also connects the negative pole of the second Schottky diode D102, the positive pole of the second Xiao Te diode D102 connects the inverting input of the first amplifier by resistance R106, the positive pole of the second Xiao Te diode D102 also connects the inverting input of the second amplifier by resistance R107, the in-phase input end of the second amplifier is by resistance R171 ground connection, the output of the second amplifier connects inverting input by resistance R108, inverting input also connects current-limiting resistance R101 by resistance R105, the output of the second amplifier is the signal output part of precision rectifying filter circuit, two power ends of the second amplifier connect two power end+15V ,-15V of two constant voltage dc source respectively.
Also include time control circuit; Described signal processing circuit comprises normal state signal treatment circuit, abnormality signal processing circuit, delay cut-off protective circuit, and described delay cut-off protective circuit is connected with time control circuit.
Described normal state signal treatment circuit the 3rd amplifier, LED light, the in-phase input end of the 3rd described amplifier passes through the normally-closed contact contact resistance R125 first end of resistance R187 and the first relay, resistance R125 second end connects the signal output part of precision rectifying filter circuit, electric capacity C7 is in parallel with resistance R125, and second end of resistance R125 is also connected with ground capacity C8, C9; The inverting input of the 3rd amplifier connects the adjustable side of adjustable resistance R190, and the first end of adjustable resistance connects power supply+12V, the second end contact resistance R191 ground connection; The output of the 3rd amplifier connects LED light first end by resistance R131, and the second end of LED light passes through resistance R192 ground connection, three-terminal link resistance R133.
Described abnormality signal processing circuit comprises diode D118, the first end of the positive pole contact resistance R125 of diode D118, and the negative pole of diode D118 connects the signal input part of fault-signal process warning circuit.
Described fault-signal process warning circuit comprises comparison circuit and alarm lamp, the in-phase input end of described comparison circuit connects the signal output part of abnormality signal processing circuit by resistance R182, the in-phase input end of comparison circuit is also by resistance R184 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R138 by resistance R181, the first end of adjustable resistance R138 connects the first three-terminal voltage-stabilizing pipe and exports, input connection+the 12V of the first three-terminal voltage-stabilizing pipe, second end of adjustable resistance R138 is by resistance R137 ground connection, two power ends of comparison circuit connect two power end+15V of two constant voltage dc source respectively,-15V, the output of comparison circuit is by resistance R139, the base stage of R140 and diode D113 connecting triode Q4, the emitter of triode Q4 is by diode D114 and resistance R143 ground connection, collector electrode connects the coil of the 4th relay, power supply+15V is connected after resistance R141, collector electrode is also by the first normally opened contact of the 6th relay, diode D116 contact resistance R143, collector electrode is also by the normally opened contact of the 4th relay, diode D117 contact resistance R143, the coil two ends of the 4th relay are also parallel with diode D115, electric capacity C34, resistance R142 and light-emitting diode D138 is also connected in parallel on the coil two ends of the 4th relay after connecting, the power control terminal of the external protective circuit of normally-closed contact of the 4th relay.
Described delay cut-off protective circuit comprises adjustable resistance R126, voltage comparator, the coil of the first relay, the first end of the first end contact resistance R125 of described adjustable resistance R126, second end of adjustable resistance R126 is by resistance R127 ground connection, adjustable side connects the in-phase input end of voltage comparator, the inverting input of voltage comparator connects the adjustable side of adjustable resistance R130 by resistance R128, the first end of adjustable resistance R130 is by resistance R129 ground connection, second end connects the output of the second three-terminal voltage-stabilizing pipe, input connection+the 15V of the second three-terminal voltage-stabilizing pipe, the output of voltage comparator passes through the base stage of resistance R134 and diode D107 connecting triode Q1, the emitter of triode Q1 is by resistance R136 ground connection, collector electrode connects the coil of the first relay, power supply+15V is connected after resistance R135, the coil two ends of the first relay are parallel with diode D110 and electric capacity C31, output also contact resistance R133, the electric capacity C27 of voltage comparator, the output of voltage comparator also connects power supply+15V after contact resistance R132,
Described time control circuit comprises time-base integrated circuit, 3rd three-terminal voltage-stabilizing pipe, first relay is to the normally opened contact of the 3rd relay, 6th relay, the input of the 3rd described three-terminal voltage-stabilizing pipe connects power supply+15V, the output of the 3rd three-terminal voltage-stabilizing pipe connects the first end of adjustable resistance R220, second end and the adjustable end of adjustable resistance R220 are all connected the first relay normally opened contact one end to the 3rd relay, the other end is by resistance R225 ground connection, first relay is to the input of the moving contact connection time-base integrated circuit of the normally opened contact of the 3rd relay, the input of time-base integrated circuit is also by electric capacity C45 ground connection, the output of time-base integrated circuit is by connecting power supply+12V after the coil of resistance R226 connection the 6th relay, resistance R226 is ground connection after contact resistance R224 also, electric capacity C47 is connected in parallel on the coil two ends of the 6th relay, resistance R227, second normally opened contact of the 6th relay, the coils from parallel connection of coils of the series circuit that light-emitting diode is formed and the 6th relay.
Described system starts control circuit and includes comparison circuit, 4th three-terminal voltage-stabilizing pipe, reset button and triode Q5, 5th relay, the operation detection power supply of power frequency DC power supply or frequency converter connects the first end of adjustable resistance R200, the adjustable side of adjustable resistance R200 connects the in-phase input end of comparison circuit, second end of adjustable resistance R200 is by resistance R201 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R204 by resistance R202, the first end of adjustable resistance R204 is by resistance R203 ground connection, second end of adjustable resistance R204 connects the output of the 4th three-terminal voltage-stabilizing pipe, the input of the 4th three-terminal voltage-stabilizing pipe connects power supply+15V by reset button, the output of comparison circuit is by resistance R205, R206 connects the positive pole of diode D140, the base stage of the negative pole connecting triode Q5 of diode D140, the emitter of triode Q5 is by resistance R208 ground connection, the collector electrode of triode Q5 connects the coil of the 5th relay, resistance R209, power supply+15V is connected after reset button, the coil two ends of the 5th relay are parallel with diode D141 and electric capacity C44, the cathode power supply end of comparison circuit connects the power end+15V of two constant voltage dc source by reset button, negative electricity source connects the power end-15V of two constant voltage dc source, the normally opened contact of the 5th relay is connected to the output of two constant voltage dc source.
The object of this invention is to provide one and comparatively accurate checkout gear is carried out to power supply, by arranging, independent current detecting is carried out to each branch road of three phase mains variable frequency power supply, and rectification is carried out to detection output signal, filtering, computing are compared, exports or time delay output, reach when frequency conversion power consumption equipment is worked under different work condition state, carry out comparatively accurate circuit protection; Adapt to multiple electric equipment working frequency range; and process output display different conditions is carried out to detection signal; user is also had the fault point of faulty circuit while protection power consumption equipment comparatively significantly indicate; make user grasp faulty circuit situation in the very first time, repair and maintenance is carried out to power consumption equipment power supply.The present invention has overcurrent protection, start-up study is protected, phase shortage and short circuit fast tripping protection function, easy for installation, adapt to current range wide, regulate and accommodation wider, control measuring current is more accurate, especially the frequency variation signal exported frequency converter is tested accurately, protection act is reliably sensitive, all device power consumptions are few, export is all that relay exports, export and control reliably, it is large that external control terminal adapts to electric current, can bringing onto load relatively large, whole system does not have heat generating components and mechanical part, can not ambient temperature effect be subject to and protection system be lost efficacy, also can recover rapidly after protection to continue to use, it is a kind of accurate reliable multiduty apparatus for protecting power supply.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is current detecting change-over circuit schematic diagram;
Fig. 3 is precise rectification circuit schematic diagram in the present invention;
Fig. 4 is signal processing circuit schematic diagram in the present invention;
Fig. 5 is that system starts control circuit schematic diagram;
Fig. 6 is three tunnel current detecting change-over circuits of the present invention, precision rectifying filter circuit, signal processing circuit schematic diagram.
Embodiment
As shown in Figure 1, the comprehensive detection of a kind of power frequency of the present invention and variable frequency power supply and Protector for using electricity, comprise current detecting change-over circuit, precision rectifying filter circuit, signal processing circuit, fault-signal process warning circuit, time control circuit and system start control circuit, described current detecting change-over circuit detects variable frequency power supply or power frequency supply signal, the voltage signal being converted to same frequency exports to precision rectifying filter circuit, signal after rectifying and wave-filtering is exported to signal processing circuit by described precision rectifying filter circuit, signal after process is exported to failure alarm circuit by signal processing circuit, system starts the signal input part of control circuit and is connected with the operation detection power supply of frequency converter or power frequency supply, signal output part connects the power control terminal of each circuit.Described current detecting change-over circuit, precision rectifying filter circuit and signal processing circuit are at least one road, for detecting a phase or the power frequency supply signal of variable frequency power supply when one tunnel, for detecting two-phase or the power frequency supply signal of variable frequency power supply when two-way, for detecting three-phase or the power frequency supply signal of variable frequency power supply when three tunnels.
As shown in Figure 2, described current detecting change-over circuit comprises the electric current that current detecting chip (BJHCS-SY Hall current sensor) will detect and is connected with current detecting chip input, export from the output of current detecting chip, two power ends of current detecting chip connect two power end+15V ,-15V of two constant voltage dc source respectively by current-limiting resistance R102, R103; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit through current-limiting resistance R101 and filter capacitor C24.When the electric current needing to detect is after 5 pin of current detecting chip input 6 pin outputs, current detecting chip will be converted into-4V--+4V voltage signal the output of same frequency according to current strength equal proportion, dual power supply system+15V ,-15V power, no matter ensure that frequency variation signal is at positive half cycle or can both Restore All current variable frequency power supply operating frequency waveform at negative half period, detect output signal sensitive reliable and stable, adapt to current strength scope wider.
As shown in Figure 3, described precision rectifying filter circuit comprises the first amplifier U1 and the second amplifier U2, the inverting input of the first described amplifier U1 connects current-limiting resistance R101 by current-limiting resistance R104, the in-phase input end of the first amplifier U1 is by resistance R170 ground connection, the first Schottky diode D101 is connected with between the output of the first amplifier U1 and inverting input, the output of the first amplifier U1 also connects the negative pole of the second Schottky diode D102, the positive pole of the second Schottky diode D102 connects the inverting input of the first amplifier U1 by resistance R106, the positive pole of the second Schottky diode D102 also connects the inverting input of the second amplifier U2 by resistance R107, the in-phase input end of the second amplifier U2 is by resistance R171 ground connection, the output of the second amplifier U2 is connected current-limiting resistance R101 with inverting input by resistance R105, the output of the second amplifier U2 is the signal output part of precision rectifying filter circuit, two power ends of the second amplifier U2 connect two power end+15V ,-15V of two constant voltage dc source respectively, can better converted back signal.
This circuit is made up of two stage amplifer and two-stage Schottky diode, and more general diode rectifier circuit is sensitiveer, adapts to low-voltage frequency range more extensive.By filtered voltage signal through multilevel amplifiers rectified feedback output dc voltage signal, the pressure drop of this rectifier system effective voltage is little, and rectified signal distortion is little, is conducive to carrying out rectification output to various frequency wave voltage signal; D. c. voltage signal after rectification will send into signal processing circuit after secondary filtering; First amplifier U1 adopts+15V and-15V dual power supply, to all useful signals, no matter positive half cycle or negative half-cycle signal, all effectively can carry out precision rectifying, thus ensure that rectified signal can driven rear class discharge circuit.
Described current signal tesing and switching circuit, the rectification of precision rectifying filter circuit, signal processing circuit are three tunnels; detect the three phase mains of variable frequency power supply respectively; respectively current detecting conversion is carried out to three phase mains; even if thus make native system other any two-phase power supplies detect do not work time, there are abnormal conditions time still can detect overload in three phase variable frequency circuit and short circuit phenomenon; normal cutoff power supply; protection power consumption equipment, ensure that the reliability of protective circuit to greatest extent.As shown in Figure 6, KA2 is the second relay to integrated circuit figure, and KA3 is the 3rd relay.
As shown in Figure 4, described signal processing circuit comprises normal state signal treatment circuit, abnormality signal processing circuit, delay cut-off protective circuit, is connected with time control circuit.Described normal state signal treatment circuit the 3rd amplifier U3, LED light D1310, the in-phase input end of the 3rd described amplifier U3 passes through the normally-closed contact contact resistance R125 first end of resistance R187 and the first relay, resistance R125 second end connects the signal output part of precision rectifying filter circuit, electric capacity C7 is in parallel with resistance R125, and second end of resistance R125 is also connected with ground capacity C8, C9; The inverting input of the 3rd amplifier U3 connects the adjustable side of adjustable resistance R190, and the first end of adjustable resistance R190 connects power supply+12V, the second end contact resistance R191 ground connection; The output of the 3rd amplifier U3 connects LED light D1310 first end by resistance R131, and second end of LED light D1310 passes through resistance R192 ground connection, three-terminal link resistance R133.When direct current signal enters the 3rd amplifier U3 after normally-closed contact KA1 and resistance R187, this signal will compare with internal system Setting signal, and export a voltage signal equal with amplifier supply power voltage, this signal will through dropping resistor R131 to LED light D1310 voltage signal, and the system be used to indicate under normal current running status connects control situation.
Described abnormality signal processing circuit comprises diode D118, the first end of the positive pole contact resistance R125 of diode D118, and the negative pole of diode D118 connects the signal input part of fault-signal process warning circuit.Described fault-signal process warning circuit comprises comparison circuit U5 and alarm lamp D138, the in-phase input end of described comparison circuit U5 connects the signal output part of abnormality signal processing circuit by resistance R182, the in-phase input end of comparison circuit U5 is also by resistance R184 ground connection, the inverting input of comparison circuit U5 connects the adjustable side of adjustable resistance R138 by resistance R181, the first end of adjustable resistance R138 connects the output of three-terminal voltage-stabilizing pipe, input connection+the 12V of three-terminal voltage-stabilizing pipe, second end of adjustable resistance R138 is by resistance R137 ground connection, two power ends of comparison circuit U5 connect two power end+15V of two constant voltage dc source respectively,-15V, the output of comparison circuit U5 is by resistance R139, the base stage of R140 and diode D113 connecting triode Q4, the emitter of triode Q4 is by diode D114 and resistance R143 ground connection, collector electrode connects the coil KA4 of the 4th relay, power supply+15V is connected after resistance R141, collector electrode is also by the normally opened contact KA6 of the 6th relay, diode D116 contact resistance R143, collector electrode is also by the normally opened contact KA4 of the 4th relay, diode D117 contact resistance R143, the coil KA4 two ends of the 4th relay are also parallel with diode D115, electric capacity C34, resistance R142 and light-emitting diode D138 is also connected in parallel on the coil KA4 two ends of the 4th relay after connecting, the power control terminal of the external protective circuit of normally-closed contact of the 4th relay.
Direct current signal directly connects the anode of comparison circuit U5 through diode D118, compare output with the protection upper voltage limit signal that system is given, export and will drive triode Q4, once relay coil KA4 connects, its normally opened contact just can be made to close, make relay be in maintenance on-state always; Namely normally-closed contact cuts off power consumption equipment power supply, disconnects external protective circuit, plays the function of overcurrent hit protection; Simultaneously light-emitting diode D138 lights, and for pointing out subscriber line circuit to break down situation, needs timely shutdown inspection fault.
Described delay cut-off protective circuit comprises adjustable resistance R126, voltage comparator, the coil KA1 of the first relay, the first end of the first end contact resistance R125 of described adjustable resistance R126, second end of adjustable resistance R126 is by resistance R127 ground connection, adjustable side connects the in-phase input end of voltage comparator U4, the inverting input of voltage comparator U4 connects the adjustable side of adjustable resistance R130 by resistance R128, the first end of adjustable resistance R130 is by resistance R129 ground connection, second end connects the output of three-terminal voltage-stabilizing pipe 78L09, the input of three-terminal voltage-stabilizing pipe is by LM7812 connection+15V, the output of voltage comparator U4 passes through the base stage of resistance R134 and diode D107 connecting triode Q1, the emitter of triode Q1 is by resistance R136 ground connection, collector electrode connects the coil KA1 of the first relay, power supply+15V is connected after resistance R135, the coil KA1 two ends of the first relay are parallel with diode D110 and electric capacity C31, the output of voltage comparator U4 also contact resistance R133, connect electric capacity C27, the output of voltage comparator U4 also connects power supply+15V after contact resistance R132.
Described time control circuit comprises time-base integrated circuit, three-terminal voltage-stabilizing pipe LM7812, first relay is to the normally opened contact KA1 of the 3rd relay, KA2, KA3, 6th relay, three-terminal voltage-stabilizing pipe LM7812 connects power supply+15V, and the output of three-terminal voltage-stabilizing pipe LM7812 connects the first end of adjustable resistance R220, and the second end and the adjustable end of adjustable resistance R220 are all connected the normally opened contact KA1 of the first relay to the 3rd relay, KA2, KA3 one end, this end is also by resistance R225 ground connection, and the first relay is to the normally opened contact KA1 of the 3rd relay, KA2, the KA3 other end connects the input of time-base integrated circuit, input is also by electric capacity C45 ground connection, the output of time-base integrated circuit is by connecting power supply+12V after the coil KA6 of resistance R226 connection the 6th relay, resistance R226 is ground connection after contact resistance R224 also, electric capacity C47 is connected in parallel on the coil KA6 two ends of the 6th relay, resistance R227, the normally opened contact KA6 of the 6th relay, the series circuit that light-emitting diode D116 is formed is in parallel with the coil KA6 of the 6th relay.
Direct current signal is input to voltage comparator U4 anode through adjustable resistance R126, this signal will compare output with system Setting signal, output signal overturns through pull-up resistor R132 and diode D107 to triode Q1 mono-voltage signal after exporting, connect for driving the first relay K A1, first relay normally-closed contact KA1 will disconnect simultaneously, and at this moment the normal LED light D1310 controlled that exports quits work; The normally opened contact KA1 of the first relay will close simultaneously, and connected the control power supply of time control circuit, time control circuit will be started working.In time control circuit, when time-base integrated circuit does not work at ordinary times, output is in high level state always, at this moment be failure to actuate owing to being all high level in the 6th relay coil KA6 two ends, as normally opened contact KA1, KA2, in KA3 any one or several closed time, namely electric capacity C45 starts charging, time-base integrated circuit input terminal voltage constantly raises, when voltage is raised to supply voltage 2/3rds, namely time-base integrated circuit starts working, at this moment time-base integrated circuit exports as low level, 6th relay coil KA6 adhesive conducting because there being electrical potential difference, it is bright that the indicator light LED that its normally opened contact KA6 connects simultaneously also can must establish initial point by cable from the power end of DC power supply, be used to indicate time relay operation conditions.Regulate size of current to realize the regulating and controlling in electric capacity C45 charging interval, this time controling mode by adjustable resistance R220, structure is simple, easy to adjust.
As shown in Figure 5, described system starts control circuit and includes comparison circuit U6, three-terminal voltage-stabilizing pipe LM7809, reset button SB1 and triode Q5, 5th relay, the operation detection power supply of frequency converter or power frequency DC power supply connect the first end of adjustable resistance R200, the adjustable side of adjustable resistance R200 connects the in-phase input end of comparison circuit U6, second end of adjustable resistance R200 is by resistance R201 ground connection, the inverting input of comparison circuit U6 connects the adjustable side of adjustable resistance R204 by resistance R202, the first end of adjustable resistance R204 is by resistance R203 ground connection, second end of adjustable resistance R204 connects the output of three-terminal voltage-stabilizing pipe LM7809, the input of three-terminal voltage-stabilizing pipe LM7809 connects power supply+15V by reset button SB1, the output of comparison circuit U6 is by resistance R205, R206 connects the positive pole of diode D140, the base stage of the negative pole connecting triode Q5 of diode D140, the emitter of triode Q5 is by resistance R208 ground connection, the collector electrode of triode Q5 connects the coil KA5 of the 5th relay, resistance R209, power supply+15V is connected after reset button, the coil KA5 two ends of the 5th relay are parallel with diode D141 and electric capacity C44, the cathode power supply end of comparison circuit U6 connects the power end+15V of two constant voltage dc source by reset button, negative electricity source connects the power end-15V of two constant voltage dc source, the normally opened contact KA5 of the 5th relay connects in a power.It is export situation for detecting frequency converter work that system starts control circuit, and protective circuit will be run after frequency converter exports in inter-sync in several seconds, and when frequency converter does not work or do not export at ordinary times, protection system does not also work.When frequency converter exports, self frequency-changing's device control terminal will synchronously introduce the DC power supply of 0V a to 10V, DC power supply is directly connected with comparison circuit U6 anode through adjustable resistance R200, when frequency converter runs, after control end exports a voltage signal, compare with default voltage, and export one with the equal control signal of fortune supply power voltage, this signal send triode Q5 to connect for power supply relay in drive system, and at this moment KA5 is closed runs starting energising.When using power frequency electric to run, also direct for power frequency DC power supply welding system can be started the comparison circuit U6 input of control circuit, system will remain operating state.When fault current being detected, pressing reset button and will allow system reset.
Claims (9)
1. the comprehensive detection of a power frequency and variable frequency power supply and Protector for using electricity, it is characterized in that: comprise current detecting change-over circuit, precision rectifying filter circuit, signal processing circuit, fault-signal process warning circuit, time control circuit and system start control circuit, described current detecting change-over circuit detects variable frequency power supply or power frequency supply signal, the voltage signal being converted to same frequency exports to precision rectifying filter circuit, signal after rectifying and wave-filtering is exported to signal processing circuit by described precision rectifying filter circuit, signal after process is exported to fault-signal process warning circuit by signal processing circuit, system starts the signal input part of control circuit and is connected with the operation detection power supply of frequency converter or power frequency supply, the signal output part of system startup control circuit connects the power control terminal of each circuit, described current detecting change-over circuit, precision rectifying filter circuit and signal processing circuit are at least one road,
Comprehensive detection and the Protector for using electricity of described power frequency and variable frequency power supply also include time control circuit; Described signal processing circuit comprises normal state signal treatment circuit, abnormality signal processing circuit, delay cut-off protective circuit, and described delay cut-off protective circuit is connected with time control circuit.
2. the comprehensive detection of power frequency according to claim 1 and variable frequency power supply and Protector for using electricity; it is characterized in that: described current detecting change-over circuit, precision rectifying filter circuit, signal processing circuit are three tunnels, detect the three phase mains of variable frequency power supply respectively.
3. the comprehensive detection of power frequency according to claim 1 and 2 and variable frequency power supply and Protector for using electricity, it is characterized in that: described current detecting change-over circuit comprises current detecting chip, the electric current detected is connected with current detecting chip input, export from the output of current detecting chip, a power end of current detecting chip connects a power end+15V of two constant voltage dc source by current-limiting resistance R102, another power end of current detecting chip connects a power end-15V of two constant voltage dc source by R103; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit through current-limiting resistance R101 and filter capacitor C24.
4. the comprehensive detection of power frequency according to claim 3 and variable frequency power supply and Protector for using electricity, it is characterized in that: described precision rectifying filter circuit comprises the first amplifier and the second amplifier, the inverting input of the first described amplifier connects current-limiting resistance R101 by current-limiting resistance R104, the in-phase input end of the first amplifier is by resistance R170 ground connection, the first Schottky diode D101 is connected with between the output of the first amplifier and the inverting input of the first amplifier, the output of the first amplifier also connects the negative pole of the second Schottky diode D102, the positive pole of the second Xiao Te diode D102 connects the inverting input of the first amplifier by resistance R106, the positive pole of the second Xiao Te diode D102 also connects the inverting input of the second amplifier by resistance R107, the in-phase input end of the second amplifier is by resistance R171 ground connection, the output of the second amplifier connects the inverting input of the second amplifier by resistance R108, the inverting input of the second amplifier also connects current-limiting resistance R101 by resistance R105, the output of the second amplifier is the signal output part of precision rectifying filter circuit, two power ends of the second amplifier connect two power end+15V ,-15V of two constant voltage dc source respectively.
5. the comprehensive detection of power frequency according to claim 4 and variable frequency power supply and Protector for using electricity, it is characterized in that: described normal state signal treatment circuit comprises the 3rd amplifier, LED light, the in-phase input end of the 3rd described amplifier passes through the normally-closed contact contact resistance R125 first end of resistance R187 and the first relay, resistance R125 second end connects the signal output part of precision rectifying filter circuit, electric capacity C7 is in parallel with resistance R125, and second end of resistance R125 is also connected with ground capacity C8, C9; The inverting input of the 3rd amplifier connects the adjustable side of adjustable resistance R190, and the first end of adjustable resistance R190 connects power supply+12V, the second end contact resistance R191 ground connection of adjustable resistance R190; The output of the 3rd amplifier connects LED light first end by resistance R131, and the second end of LED light passes through resistance R192 ground connection, the three-terminal link resistance R133 of LED light.
6. the comprehensive detection of power frequency according to claim 5 and variable frequency power supply and Protector for using electricity; it is characterized in that: described abnormality signal processing circuit comprises diode D118; the first end of the positive pole contact resistance R125 of diode D118, the negative pole of diode D118 connects the signal input part of fault-signal process warning circuit.
7. the comprehensive detection of power frequency according to claim 6 and variable frequency power supply and Protector for using electricity, it is characterized in that: described fault-signal process warning circuit comprises comparison circuit and alarm lamp, the in-phase input end of described comparison circuit connects the signal output part of abnormality signal processing circuit by resistance R182, the in-phase input end of comparison circuit is also by resistance R184 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R138 by resistance R181, the first end of adjustable resistance R138 connects the first three-terminal voltage-stabilizing pipe and exports, the input of the first three-terminal voltage-stabilizing pipe connects power supply+12V, second end of adjustable resistance R138 is by resistance R137 ground connection, two power ends of comparison circuit connect two power end+15V of two constant voltage dc source respectively,-15V, the output of comparison circuit is by resistance R139, the base stage of R140 and diode D113 connecting triode Q4, the emitter of triode Q4 is by diode D114 and resistance R143 ground connection, collector electrode connects the coil of the 4th relay, power end+the 15V of two constant voltage dc source is connected after resistance R141, collector electrode is also by the first normally opened contact of the 6th relay, diode D116 contact resistance R143, collector electrode is also by the normally opened contact of the 4th relay, diode D117 contact resistance R143, the coil two ends of the 4th relay are also parallel with diode D115, electric capacity C34, resistance R142 and light-emitting diode D138 is also connected in parallel on the coil two ends of the 4th relay after connecting, the power control terminal of the external protective circuit of normally-closed contact of the 4th relay.
8. the comprehensive detection of power frequency according to claim 7 and variable frequency power supply and Protector for using electricity, it is characterized in that: described delay cut-off protective circuit comprises adjustable resistance R126, voltage comparator, the coil of the first relay, the first end of the first end contact resistance R125 of described adjustable resistance R126, second end of adjustable resistance R126 is by resistance R127 ground connection, the adjustable side of adjustable resistance R126 connects the in-phase input end of voltage comparator, the inverting input of voltage comparator connects the adjustable side of adjustable resistance R130 by resistance R128, the first end of adjustable resistance R130 is by resistance R129 ground connection, second end of adjustable resistance R130 connects the output of the second three-terminal voltage-stabilizing pipe, the input of the second three-terminal voltage-stabilizing pipe connects the power end+15V of two constant voltage dc source, the output of voltage comparator passes through the base stage of resistance R134 and diode D107 connecting triode Q1, the emitter of triode Q1 is by resistance R136 ground connection, collector electrode connects the coil of the first relay, power end+the 15V of two constant voltage dc source is connected after resistance R135, the coil two ends of the first relay are parallel with diode D110 and electric capacity C31, output also contact resistance R133, the electric capacity C27 of voltage comparator, the output of voltage comparator also connects the power end+15V of two constant voltage dc source after contact resistance R132,
Described time control circuit comprises time-base integrated circuit, 3rd three-terminal voltage-stabilizing pipe, first relay is to the normally opened contact of the 3rd relay, 6th relay, the input of the 3rd described three-terminal voltage-stabilizing pipe connects the power end+15V of two constant voltage dc source, the output of the 3rd three-terminal voltage-stabilizing pipe connects the first end of adjustable resistance R220, second end and the adjustable end of adjustable resistance R220 are all connected the first relay normally opened contact one end to the 3rd relay, first relay passes through resistance R225 ground connection to the normally opened contact other end of the 3rd relay, first relay is to the input of the moving contact connection time-base integrated circuit of the normally opened contact of the 3rd relay, the input of time-base integrated circuit is also by electric capacity C45 ground connection, the output of time-base integrated circuit is by connecting power supply+12V after the coil of resistance R226 connection the 6th relay, resistance R226 is ground connection after contact resistance R224 also, electric capacity C47 is connected in parallel on the coil two ends of the 6th relay, resistance R227, second normally opened contact of the 6th relay, the coils from parallel connection of coils of the series circuit that light-emitting diode is formed and the 6th relay.
9. the comprehensive detection of power frequency according to claim 8 and variable frequency power supply and Protector for using electricity, it is characterized in that: described system starts control circuit and includes comparison circuit, 4th three-terminal voltage-stabilizing pipe, reset button and triode Q5, 5th relay, the operation detection power supply of power frequency DC power supply or frequency converter connects the first end of adjustable resistance R200, the adjustable side of adjustable resistance R200 connects the in-phase input end of comparison circuit, second end of adjustable resistance R200 is by resistance R201 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R204 by resistance R202, the first end of adjustable resistance R204 is by resistance R203 ground connection, second end of adjustable resistance R204 connects the output of the 4th three-terminal voltage-stabilizing pipe, the input of the 4th three-terminal voltage-stabilizing pipe connects the power end+15V of two constant voltage dc source by reset button, the output of comparison circuit is by resistance R205, R206 connects the positive pole of diode D140, the base stage of the negative pole connecting triode Q5 of diode D140, the emitter of triode Q5 is by resistance R208 ground connection, the collector electrode of triode Q5 connects the coil of the 5th relay, resistance R209, power end+the 15V of two constant voltage dc source is connected after reset button, the coil two ends of the 5th relay are parallel with diode D141 and electric capacity C44, the cathode power supply end of comparison circuit connects the power end+15V of two constant voltage dc source by reset button, negative electricity source connects the power end-15V of two constant voltage dc source, the normally opened contact of the 5th relay is connected to the output of two constant voltage dc source.
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| CN111756016A (en) * | 2019-03-28 | 2020-10-09 | 杭州彼爱琪电器有限公司 | Relay |
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