CN203233148U - Comprehensive detection and power utilization protection device of power frequency and variable-frequency power supply - Google Patents
Comprehensive detection and power utilization protection device of power frequency and variable-frequency power supply Download PDFInfo
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- CN203233148U CN203233148U CN 201320194658 CN201320194658U CN203233148U CN 203233148 U CN203233148 U CN 203233148U CN 201320194658 CN201320194658 CN 201320194658 CN 201320194658 U CN201320194658 U CN 201320194658U CN 203233148 U CN203233148 U CN 203233148U
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Abstract
The utility model discloses a comprehensive detection and power utilization protection device of power frequency and variable-frequency power supplies. The comprehensive detection and power utilization protection device comprises a current detection conversion circuit, a precision rectifying filter circuit, a signal processing circuit, a fault signal processing alarm circuit, a time control circuit and a system starting-up control circuit. The current detection conversion circuit detects and converts variable-frequency or power frequency power supply signals into voltage signals with the same frequency and outputs the voltage signals with the same frequency to the precision rectifying filter circuit. The precision rectifying filter circuit outputs the rectified and filtered signals to the signal processing circuit, the signal processing circuit outputs the processed signals to the fault signal alarm circuit, a signal input terminal of the system starting-up control circuit is connected with a work detection circuit of a transducer, and a signal output terminal is connected with a power supply control terminal of each circuit. The comprehensive detection and power utilization protection device is capable of carrying out precise circuit protection for a power supply, is available in a plurality of working frequency ranges of an electrical device, and allows users to know the condition of fault circuits in first time and to carry out overhaul and maintenance for the power supply of the electrical device.
Description
Technical field
The utility model relates to a kind of apparatus for protecting power supply, relates in particular to comprehensive detection and the Protector for using electricity of a kind of power frequency and variable frequency power supply.
Background technology
At present; electric circuit inspection and protection device mostly are the protective device that moves under the power frequency state on the market; when power supply changes frequency; especially a lot of protection devices misoperation will occur even damage and fault occur under high frequency situations; and the thermal overload protection device that can adapt to different frequency is accurate and sensitive inadequately, and accuracy of detection is lower, and it is little to adapt to current range; failure rate is also higher, and existing equipment does not reach the protection requirement of the circuit of having relatively high expectations to precision equipment or to circuit protection.
The utility model content
The purpose of this utility model provides comprehensive detection and the Protector for using electricity of a kind of power frequency and variable frequency power supply, can carry out comparatively accurate power protection.
The utility model adopts following technical proposals: the comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity, comprise the current detecting change-over circuit, the precision rectifying filter circuit, signal processing circuit, fault-signal is handled 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 that is converted to same frequency is exported to the precision rectifying filter circuit, the signal of described precision rectifying filter circuit after with rectifying and wave-filtering exported to signal processing circuit, signal after signal processing circuit will be handled is exported to fault-signal and is handled warning circuit, the signal input part that system starts control circuit is connected with operation detection power supply or the power frequency supply of frequency converter, and 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 detection change-over circuit, the rectification of precision rectifying filter circuit, signal are handled and are three the tunnel, detect the three phase mains of variable frequency power supply respectively.
Described current detecting change-over circuit comprises the current detecting chip, the electric current that detects is connected with current detecting chip input, from the output of the output of current detecting chip, two power ends of current detecting chip respectively by current-limiting resistance R102, R103 connect two constant voltage dc sources two power end+15V ,-15V; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit with filter capacitor C24 through current-limiting resistance R101.
Described precision rectifying filter circuit comprises first amplifier and second amplifier, the inverting input of described first amplifier connects current-limiting resistance R101 by current-limiting resistance R104, the in-phase input end of first amplifier is by resistance R 170 ground connection, be connected with the first Schottky diode D101 between the output of first amplifier and the inverting input, the output of 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 first amplifier by resistance R 106, the positive pole of the second Xiao Te diode D102 also connects the inverting input of second amplifier by resistance R 107, the in-phase input end of second amplifier is by resistance R 171 ground connection, the output of second amplifier connects inverting input by resistance R 108, inverting input also connects current-limiting resistance R101 by resistance R 105, and the output of second amplifier is the signal output part of precision rectifying filter circuit; Two power ends of second amplifier connect respectively two constant voltage dc sources two power end+15V ,-15V.
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 described the 3rd amplifier is connected resistance R 125 first ends by the normally-closed contact of resistance R 187 and first relay, resistance R 125 second ends connect the signal output part of precision rectifying filter circuit, capacitor C 7 is in parallel with resistance R 125, and second end of resistance R 125 also is connected with ground capacity C8, C9; The inverting input of the 3rd amplifier connects the adjustable side of adjustable resistance R190, and first end of adjustable resistance connects power supply+12V, and second end connects resistance R 191 ground connection; The output of the 3rd amplifier connects LED light first end by resistance R 131, and second end of LED light is by resistance R 192 ground connection, and the 3rd end connects resistance R 133.
Described abnormality signal processing circuit comprises diode D118, and the positive pole of diode D118 connects first end of resistance R 125, and the negative pole of diode D118 connects the signal input part that fault-signal is handled warning circuit.
Described fault-signal is handled warning circuit and is comprised 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 R 182, the in-phase input end of comparison circuit is also by resistance R 184 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R138 by resistance R 181, first end of adjustable resistance R138 connects the output of the first three-terminal voltage-stabilizing pipe, input connection+the 12V of the first three-terminal voltage-stabilizing pipe, second end of adjustable resistance R138 is by resistance R 137 ground connection, two power ends of comparison circuit connect two power end+15V of two constant voltage dc sources respectively,-15V, the output of comparison circuit is by resistance R 139, R140 is connected the base stage of triode Q4 with diode D113, the emitter of triode Q4 is by diode D114 and resistance R 143 ground connection, collector electrode connects the coil of the 4th relay, resistance R 141 backs connect power supply+15V, collector electrode also passes through first normally opened contact of the 6th relay, diode D116 connects resistance R 143, collector electrode also passes through the normally opened contact of the 4th relay, diode D117 connects resistance R 143, the coil two ends of the 4th relay also are parallel with diode D115, capacitor C 34 also is connected in parallel on the coil two ends of the 4th relay after resistance R 142 and the light-emitting diode D138 series connection; 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 first relay, first end of described adjustable resistance R126 connects first end of resistance R 125, second end of adjustable resistance R126 is by resistance R 127 ground connection, the 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 R 128, first end of adjustable resistance R130 is by resistance R 129 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 is connected the base stage of triode Q1 with diode D107 by resistance R 134, the emitter of triode Q1 is by resistance R 136 ground connection, collector electrode connects the coil of first relay, resistance R 135 backs connect power supply+15V, and the coil two ends of first relay are parallel with diode D110 and capacitor C 31; The output of voltage comparator also connects resistance R 133, capacitor C 27, and the output of voltage comparator also connects resistance R 132 backs and connects power supply+15V;
Described time control circuit comprises time-base integrated circuit, the 3rd three-terminal voltage-stabilizing pipe, the normally opened contact of first relay to the, three relays, the 6th relay, the input of described the 3rd three-terminal voltage-stabilizing pipe connects power supply+15V, the output of the 3rd three-terminal voltage-stabilizing pipe connects first end of adjustable resistance R220, second end of adjustable resistance R220 and adjustable end all are connected normally opened contact one end of first relay to the, three relays, the other end is by resistance R 225 ground connection, the moving contact of the normally opened contact of first relay to the, three relays connects the input of time-base integrated circuit, the input of time-base integrated circuit is also by capacitor C 45 ground connection, connect power supply+12V behind the coil of the output of time-base integrated circuit by resistance R 226 connections the 6th relay, resistance R 226 also connects resistance R 224 back ground connection, capacitor C 47 is connected in parallel on the coil two ends of the 6th relay, resistance R 227, second normally opened contact of the 6th relay, the series circuit that light-emitting diode constitutes and the coils from parallel connection of coils of the 6th relay.
Described system starts control circuit and includes comparison circuit, the 4th three-terminal voltage-stabilizing pipe, reset button and triode Q5, the 5th relay, the operation detection power supply of power frequency DC power supply or frequency converter connects 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 R 201 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R204 by resistance R 202, first end of adjustable resistance R204 is by resistance R 203 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 R 205, R206 connects the positive pole of diode D140, the negative pole of diode D140 connects the base stage of triode Q5, the emitter of triode Q5 is by resistance R 208 ground connection, the collector electrode of triode Q5 connects the coil of the 5th relay, resistance R 209, connect power supply+15V after the reset button, the coil two ends of the 5th relay are parallel with diode D141 and capacitor C 44, the cathode power supply end of comparison circuit connects the power end+15V of two constant voltage dc sources by reset button, the negative power supply end connects the power end-15V of two constant voltage dc sources, and the normally opened contact of the 5th relay is connected the output of two constant voltage dc sources.
The purpose of this utility model provides a kind ofly carries out comparatively accurate checkout gear to power supply, carry out independent current detecting by each branch road that arranges the three phase mains variable frequency power supply, and to detect output signal carry out rectification, filtering, computing relatively, output or time-delay output, reach when the frequency conversion power consumption equipment worked under different work condition states, carry out comparatively accurate circuit protection; Adapt to multiple electric equipment working frequency range; and detection signal is handled output show different conditions; make the user in the protection power consumption equipment, also to the fault point of faulty circuit comparatively significantly indication be arranged; make the user grasp the faulty circuit situation in the very first time, the power consumption equipment power supply is carried out repair and maintenance.The utlity model has overcurrent protection; start delay protection; phase shortage and short circuit fast tripping protection function; easy for installation; it is wide to adapt to current range; adjusting and accommodation are wider; the control measuring current is more accurate; especially accurate to the frequency variation signal test of frequency converter output; protection is active in one's movements reliable; all device power consumptions are few; output all is relay output; output control is reliable, and it is big that the external control terminal adapts to electric current, but bringing onto load is relatively large; whole system does not have heat generating components and mechanical part; can not be subjected to ambient temperature effect and protection system was lost efficacy, also can recover rapidly after the protection to continue to use, be a kind of accurate and reliable multiduty apparatus for protecting power supply.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is current detecting change-over circuit schematic diagram;
Fig. 3 is precise rectification circuit schematic diagram in the utility model;
Fig. 4 is signal processing circuit schematic diagram in the utility model;
Fig. 5 starts the control circuit schematic diagram for system;
Fig. 6 is three tunnel current detecting change-over circuits of the present utility model, precision rectifying filter circuit, signal processing circuit schematic diagram.
Embodiment
As shown in Figure 1; comprehensive detection and the Protector for using electricity of a kind of power frequency of the utility model and variable frequency power supply; comprise the current detecting change-over circuit; the precision rectifying filter circuit; signal processing circuit; fault-signal is handled 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 that is converted to same frequency is exported to the precision rectifying filter circuit; the signal of described precision rectifying filter circuit after with rectifying and wave-filtering exported to signal processing circuit; signal after signal processing circuit will be handled is exported to failure alarm circuit; the signal input part that system starts control circuit is connected with operation detection power supply or the power frequency supply of frequency converter, and 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, in the time of one the tunnel for detection of detect variable frequency power supply one mutually or the power frequency supply signal, in the time of two-way for detection of the two-phase or the power frequency supply signal that detect variable frequency power supply, in the time of three the tunnel for detection of the three-phase or the power frequency supply signal that detect variable frequency power supply.
As shown in Figure 2, described current detecting change-over circuit comprises that the electric current that current detecting chip (BJHCS-SY Hall current sensor) will detect is connected with current detecting chip input, from the output of the output of current detecting chip, two power ends of current detecting chip respectively by current-limiting resistance R102, R103 connect two constant voltage dc sources two power end+15V ,-15V; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit with filter capacitor C24 through current-limiting resistance R101.When electric current that needs detect after 5 pin of current detecting chip are imported the output of 6 pin, the current detecting chip will according to the current strength equal proportion be converted into same frequency-4V--+4V voltage signal output, dual power supply system+15V ,-the 15V power supply, no matter guaranteed that frequency variation signal is at positive half cycle or can both the current variable frequency power supply operating frequency of Restore All waveform at negative half period, it is reliable and stable to detect the output signal sensitivity, and it is wider to adapt to the current strength scope.
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 described first 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 R 170 ground connection, be connected with the first Schottky diode D101 between the output of the first amplifier U1 and the 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 R 106, the positive pole of the second Schottky diode D102 also connects the inverting input of the second amplifier U2 by resistance R 107, the in-phase input end of the second amplifier U2 is by resistance R 171 ground connection, the output of the second amplifier U2 is connected current-limiting resistance R101 with inverting input by resistance R 105, and 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 respectively two constant voltage dc sources two power end+15V ,-15V, can better transform recovering signal.
This circuit is made up of two stage amplifer and two-stage Schottky diode, and more general diode rectifier circuit is sensitiveer, and it is more extensive to adapt to the low-voltage frequency range.Through multistage amplifier rectification feedback output dc voltage signal, the pressure drop of this rectifier system effective voltage is little with filtered voltage signal, and the rectified signal distortion is little, is conducive to various frequency waveform voltage signals are carried out rectification output; D. c. voltage signal after the rectification will be sent into signal processing circuit behind secondary filtering; The first amplifier U1 employing+15V and-the 15V dual power supply, to all useful signals, no matter positive half cycle or negative half-cycle signal all can effectively carry out precision rectifying, thereby guaranteed rectified signal can driven after the level discharge circuit.
Described current signal detection change-over circuit, the rectification of precision rectifying filter circuit, signal processing circuit are three the tunnel; detect the three phase mains of variable frequency power supply respectively; three phase mains is carried out the current detecting conversion respectively; even thereby make native system detect when not working at other any two-phase power supplies, still can detect overload and short circuit phenomenon in the three phase variable frequency circuit when abnormal conditions occurring; the normal cutoff power supply; protect power consumption equipment, guaranteed the reliability of protective circuit to greatest extent.Integrated circuit figure as shown in Figure 6, KA2 is second relay, 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 described the 3rd amplifier U3 is connected resistance R 125 first ends by the normally-closed contact of resistance R 187 and first relay, resistance R 125 second ends connect the signal output part of precision rectifying filter circuit, capacitor C 7 is in parallel with resistance R 125, and second end of resistance R 125 also is connected with ground capacity C8, C9; The inverting input of the 3rd amplifier U3 connects the adjustable side of adjustable resistance R190, and first end of adjustable resistance R190 connects power supply+12V, and second end connects resistance R 191 ground connection; The output of the 3rd amplifier U3 connects LED light D1310 first end by resistance R 131, and second end of LED light D1310 is by resistance R 192 ground connection, and the 3rd end connects resistance R 133.When direct current signal enters the 3rd amplifier U3 after normally-closed contact KA1 and resistance R 187, this signal will compare with the given signal of internal system, and export a voltage signal that equates with the amplifier supply power voltage, this signal will be given voltage signal of LED light D1310 through dropping resistor R131, and the system that is used to indicate under the normal current running status connects the control situation.
Described abnormality signal processing circuit comprises diode D118, and the positive pole of diode D118 connects first end of resistance R 125, and the negative pole of diode D118 connects the signal input part that fault-signal is handled warning circuit.Described fault-signal is handled warning circuit and is comprised 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 R 182, the in-phase input end of comparison circuit U5 is also by resistance R 184 ground connection, the inverting input of comparison circuit U5 connects the adjustable side of adjustable resistance R138 by resistance R 181, 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 R 137 ground connection, two power ends of comparison circuit U5 connect two power end+15V of two constant voltage dc sources respectively,-15V, the output of comparison circuit U5 is by resistance R 139, R140 is connected the base stage of triode Q4 with diode D113, the emitter of triode Q4 is by diode D114 and resistance R 143 ground connection, collector electrode connects the coil KA4 of the 4th relay, resistance R 141 backs connect power supply+15V, collector electrode also passes through the normally opened contact KA6 of the 6th relay, diode D116 connects resistance R 143, collector electrode also passes through the normally opened contact KA4 of the 4th relay, diode D117 connects resistance R 143, the coil KA4 two ends of the 4th relay also are parallel with diode D115, capacitor C 34 also is connected in parallel on the coil KA4 two ends of the 4th relay after resistance R 142 and the light-emitting diode D138 series connection; 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, the protection upper voltage limit signal given with system compares output, and output will drive triode Q4, in case relay coil KA4 connects, just can make its normally opened contact closure, make relay be in the maintenance on-state always; Normally-closed contact namely cuts off the power consumption equipment power supply, disconnects external protective circuit, plays the function of overcurrent hit protection; Simultaneously light-emitting diode D138 lights, and is used for the prompting subscriber line circuit situation that breaks down, and needs timely shutdown inspection fault.
Described delay cut-off protective circuit comprises adjustable resistance R126, voltage comparator, the coil KA1 of first relay, first end of described adjustable resistance R126 connects first end of resistance R 125, second end of adjustable resistance R126 is by resistance R 127 ground connection, the 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 R 128, first end of adjustable resistance R130 is by resistance R 129 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 is connected the base stage of triode Q1 with diode D107 by resistance R 134, the emitter of triode Q1 is by resistance R 136 ground connection, collector electrode connects the coil KA1 of first relay, resistance R 135 backs connect power supply+15V, and the coil KA1 two ends of first relay are parallel with diode D110 and capacitor C 31; The output of voltage comparator U4 also connects resistance R 133, connects capacitor C 27, and the output of voltage comparator U4 also connects resistance R 132 backs and connects power supply+15V.
Described time control circuit comprises time-base integrated circuit, three-terminal voltage-stabilizing pipe LM7812, the normally opened contact KA1 of first relay to the, three relays, KA2, KA3, the 6th relay, three-terminal voltage-stabilizing pipe LM7812 connects power supply+15V, the output of three-terminal voltage-stabilizing pipe LM7812 connects first end of adjustable resistance R220, second end of adjustable resistance R220 and adjustable end all are connected the normally opened contact KA1 of first relay to the, three relays, KA2, KA3 one end, this end is also by resistance R 225 ground connection, the normally opened contact KA1 of first relay to the, three relays, KA2, the KA3 other end connects the input of time-base integrated circuit, input is also by capacitor C 45 ground connection, connect power supply+12V behind the coil KA6 of the output of time-base integrated circuit by resistance R 226 connections the 6th relay, resistance R 226 also connects resistance R 224 back ground connection, capacitor C 47 is connected in parallel on the coil KA6 two ends of the 6th relay, resistance R 227, the normally opened contact KA6 of the 6th relay, the series circuit that light-emitting diode D116 constitutes 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 the given signal of system, upset is given triode Q1 one voltage signal through pull-up resistor R132 and diode D107 after the output signal output, being used for driving the first relay K A1 connects, the first relay normally-closed contact KA1 will disconnect simultaneously, and at this moment the LED light D1310 of normal output control quits work; The normally opened contact KA1 of first relay has connected the control power supply of time control circuit with closure simultaneously, and time control circuit will be started working.In the time control circuit, output was not in high level state always when time-base integrated circuit was not worked at ordinary times, at this moment the 6th relay coil KA6 two ends are owing to all being that high level is failure to actuate, as normally opened contact KA1, KA2, among the KA3 when any one or plurality of closed, capacitor C 45 namely begins charging, the time-base integrated circuit input terminal voltage constantly raises, when voltage is raised to supply voltage 2/3rds, time-base integrated circuit is namely started working, at this moment time-base integrated circuit is output as low level, the 6th relay coil KA6 is because there being electrical potential difference adhesive conducting, it is bright that the indicator light LED of its normally opened contact KA6 connection simultaneously also can must establish initial point by cable from the power end of DC power supply, is used to indicate time relay operation conditions.Regulate size of current by adjustable resistance R220 and realize the capacitor C regulating and controlling in 45 charging intervals, this time control mode, simple in structure, 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, the 5th relay, the operation detection power supply of frequency converter or power frequency DC power supply connect 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 R 201 ground connection, the inverting input of comparison circuit U6 connects the adjustable side of adjustable resistance R204 by resistance R 202, first end of adjustable resistance R204 is by resistance R 203 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 R 205, R206 connects the positive pole of diode D140, the negative pole of diode D140 connects the base stage of triode Q5, the emitter of triode Q5 is by resistance R 208 ground connection, the collector electrode of triode Q5 connects the coil KA5 of the 5th relay, resistance R 209, connect power supply+15V after the reset button, the coil KA5 two ends of the 5th relay are parallel with diode D141 and capacitor C 44, the cathode power supply end of comparison circuit U6 connects the power end+15V of two constant voltage dc sources by reset button, the negative power supply end connects the power end-15V of two constant voltage dc sources, and the normally opened contact KA5 of the 5th relay is connected in the power circuit.It is for detection of frequency converter work output situation that system starts control circuit, and protective circuit will be moved after frequency converter output in inter-sync in several seconds, and frequency converter is not worked or when not exporting, protection system is not worked yet at ordinary times.When frequency converter is exported, self frequency-changing's device control terminal will be introduced a 0V synchronously to the DC power supply of 10V, DC power supply directly is connected with comparison circuit U6 anode through adjustable resistance R200, when the frequency converter operation, after control end is exported a voltage signal, compare with default voltage, and export a control signal that equates with the fortune supply power voltage, this signal send triode Q5 to be used for power supply relay connection in the drive system, and at this moment the KA5 closure will begin the energising operation.When using the operation of power frequency electricity, also the direct welding system of power frequency DC power supply can be started the comparison circuit U6 input of control circuit, system will remain operating state.When detecting fault current, press reset button the permission system is resetted.
Claims (10)
1. comprehensive detection and the Protector for using electricity of a power frequency and variable frequency power supply, it is characterized in that: comprise the current detecting change-over circuit, the precision rectifying filter circuit, signal processing circuit, fault-signal is handled 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 that is converted to same frequency is exported to the precision rectifying filter circuit, the signal of described precision rectifying filter circuit after with rectifying and wave-filtering exported to signal processing circuit, signal after signal processing circuit will be handled is exported to fault-signal and is handled warning circuit, the signal input part that system starts control circuit is connected with operation detection power supply or the power frequency supply of frequency converter, and 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.
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 signal detection change-over circuit, the rectification of precision rectifying filter circuit, signal are handled and are three the tunnel, 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 the current detecting chip, the electric current that detects is connected with current detecting chip input, from the output of the output of current detecting chip, two power ends of current detecting chip respectively by current-limiting resistance R102, R103 connect two constant voltage dc sources two power end+15V ,-15V; The detection signal output of current detecting chip is connected the input of precision rectifying filter circuit with filter capacitor C24 through current-limiting resistance R101.
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 first amplifier and second amplifier, the inverting input of described first amplifier connects current-limiting resistance R101 by current-limiting resistance R104, the in-phase input end of first amplifier is by resistance R 170 ground connection, be connected with the first Schottky diode D101 between the output of first amplifier and the inverting input, the output of 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 first amplifier by resistance R 106, the positive pole of the second Xiao Te diode D102 also connects the inverting input of second amplifier by resistance R 107, the in-phase input end of second amplifier is by resistance R 171 ground connection, the output of second amplifier connects inverting input by resistance R 108, inverting input also connects current-limiting resistance R101 by resistance R 105, and the output of second amplifier is the signal output part of precision rectifying filter circuit; Two power ends of second amplifier connect respectively two constant voltage dc sources two power end+15V ,-15V.
5. the comprehensive detection of power frequency according to claim 4 and variable frequency power supply and Protector for using electricity is characterized in that: 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.
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 normal state signal treatment circuit the 3rd amplifier, LED light, the in-phase input end of described the 3rd amplifier is connected resistance R 125 first ends by the normally-closed contact of resistance R 187 and first relay, resistance R 125 second ends connect the signal output part of precision rectifying filter circuit, capacitor C 7 is in parallel with resistance R 125, and second end of resistance R 125 also is connected with ground capacity C8, C9; The inverting input of the 3rd amplifier connects the adjustable side of adjustable resistance R190, and first end of adjustable resistance connects power supply+12V, and second end connects resistance R 191 ground connection; The output of the 3rd amplifier connects LED light first end by resistance R 131, and second end of LED light is by resistance R 192 ground connection, and the 3rd end connects resistance R 133.
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 abnormality signal processing circuit comprises diode D118; the positive pole of diode D118 connects first end of resistance R 125, and the negative pole of diode D118 connects the signal input part that fault-signal is handled warning circuit.
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 fault-signal is handled warning circuit and is comprised 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 R 182, the in-phase input end of comparison circuit is also by resistance R 184 ground connection, the inverting input of comparison circuit connects the adjustable side of adjustable resistance R138 by resistance R 181, first end of adjustable resistance R138 connects the output of the first three-terminal voltage-stabilizing pipe, input connection+the 12V of the first three-terminal voltage-stabilizing pipe, second end of adjustable resistance R138 is by resistance R 137 ground connection, two power ends of comparison circuit connect two power end+15V of two constant voltage dc sources respectively,-15V, the output of comparison circuit is by resistance R 139, R140 is connected the base stage of triode Q4 with diode D113, the emitter of triode Q4 is by diode D114 and resistance R 143 ground connection, collector electrode connects the coil of the 4th relay, resistance R 141 backs connect power supply+15V, collector electrode also passes through first normally opened contact of the 6th relay, diode D116 connects resistance R 143, collector electrode also passes through the normally opened contact of the 4th relay, diode D117 connects resistance R 143, the coil two ends of the 4th relay also are parallel with diode D115, capacitor C 34 also is connected in parallel on the coil two ends of the 4th relay after resistance R 142 and the light-emitting diode D138 series connection; The power control terminal of the external protective circuit of normally-closed contact of the 4th 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 delay cut-off protective circuit comprises adjustable resistance R126, voltage comparator, the coil of first relay, first end of described adjustable resistance R126 connects first end of resistance R 125, second end of adjustable resistance R126 is by resistance R 127 ground connection, the 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 R 128, first end of adjustable resistance R130 is by resistance R 129 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 is connected the base stage of triode Q1 with diode D107 by resistance R 134, the emitter of triode Q1 is by resistance R 136 ground connection, collector electrode connects the coil of first relay, resistance R 135 backs connect power supply+15V, and the coil two ends of first relay are parallel with diode D110 and capacitor C 31; The output of voltage comparator also connects resistance R 133, capacitor C 27, and the output of voltage comparator also connects resistance R 132 backs and connects power supply+15V;
Described time control circuit comprises time-base integrated circuit, the 3rd three-terminal voltage-stabilizing pipe, the normally opened contact of first relay to the, three relays, the 6th relay, the input of described the 3rd three-terminal voltage-stabilizing pipe connects power supply+15V, the output of the 3rd three-terminal voltage-stabilizing pipe connects first end of adjustable resistance R220, second end of adjustable resistance R220 and adjustable end all are connected normally opened contact one end of first relay to the, three relays, the other end is by resistance R 225 ground connection, the moving contact of the normally opened contact of first relay to the, three relays connects the input of time-base integrated circuit, the input of time-base integrated circuit is also by capacitor C 45 ground connection, connect power supply+12V behind the coil of the output of time-base integrated circuit by resistance R 226 connections the 6th relay, resistance R 226 also connects resistance R 224 back ground connection, capacitor C 47 is connected in parallel on the coil two ends of the 6th relay, resistance R 227, second normally opened contact of the 6th relay, the series circuit that light-emitting diode constitutes and the coils from parallel connection of coils of the 6th relay.
10. the comprehensive detection of power frequency according to claim 9 and variable frequency power supply and Protector for using electricity; it is characterized in that: described system starts control circuit and includes comparison circuit; the 4th three-terminal voltage-stabilizing pipe; reset button and triode Q5; the 5th relay; the operation detection power supply of power frequency DC power supply or frequency converter connects 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 R 201 ground connection; the inverting input of comparison circuit connects the adjustable side of adjustable resistance R204 by resistance R 202; first end of adjustable resistance R204 is by resistance R 203 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 R 205; R206 connects the positive pole of diode D140; the negative pole of diode D140 connects the base stage of triode Q5; the emitter of triode Q5 is by resistance R 208 ground connection; the collector electrode of triode Q5 connects the coil of the 5th relay; resistance R 209; connect power supply+15V after the reset button; the coil two ends of the 5th relay are parallel with diode D141 and capacitor C 44; the cathode power supply end of comparison circuit connects the power end+15V of two constant voltage dc sources by reset button; the negative power supply end connects the power end-15V of two constant voltage dc sources, and the normally opened contact of the 5th relay is connected the output of two constant voltage dc sources.
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| CN 201320194658 CN203233148U (en) | 2013-04-17 | 2013-04-17 | Comprehensive detection and power utilization protection device of power frequency and variable-frequency power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208782A (en) * | 2013-04-17 | 2013-07-17 | 徐达 | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208782A (en) * | 2013-04-17 | 2013-07-17 | 徐达 | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies |
| CN103208782B (en) * | 2013-04-17 | 2015-09-09 | 徐达 | The comprehensive detection of a kind of power frequency and variable frequency power supply and Protector for using electricity |
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