CN110233578A - Frequency converter charge relay is attracted control device and control method - Google Patents
Frequency converter charge relay is attracted control device and control method Download PDFInfo
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- CN110233578A CN110233578A CN201910482705.4A CN201910482705A CN110233578A CN 110233578 A CN110233578 A CN 110233578A CN 201910482705 A CN201910482705 A CN 201910482705A CN 110233578 A CN110233578 A CN 110233578A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000002955 isolation Methods 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 5
- 210000001699 lower leg Anatomy 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The present invention relates to power electronics fields, control device is attracted more particularly to a kind of frequency converter charge relay, its central processor CPU respectively with busbar voltage detection circuit, control relay circuit is connected, busbar voltage detection circuit detects the end voltage U0 at charging capacitor both ends and to central processor CPU input direct-current voltage signal VDC, if end voltage U0 is more than or equal to actuation threshold voltage and d. c. voltage signal VDC no longer becomes larger, then central processor CPU controls charge relay RY1 by control relay circuit and is attracted, both charge relay had been avoided to damage because operating current is excessive, also improve electrical efficiency；The invention further relates to a kind of frequency converter charge relays to be attracted control method, is avoided that charge relay is damaged because operating current is excessive, also improves electrical efficiency.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of frequency converter charge relay actuation control device,
And a kind of frequency converter charge relay is attracted control method.
Background technique
Frequency converter can be divided into ac-ac frequency converter and ac-dc-ac frequency converter by mapping mode, we are generally using friendship-at present
The frequency converter of directly-friendship mapping mode.The main loop circuit of ac-dc-ac frequency converter include rectification circuit, power on buffer circuit,
Inverter circuit.
Since network voltage has bigger peak voltage after over commutation, in order to avoid peak voltage makes component
At damage, needing to arrange in pairs or groups powers on buffer circuit and is filtered to the bus after rectification, at this moment trigger relay be attracted there have been
Two kinds of judgment modes, a kind of mode is to determine according to the charging time, but due to different capacity charging time difference, relay
Be attracted will cause the excessive and easy failure of relay operating current too early, and relay is attracted too late will lead to and powers on waiting time mistake
Long, client is unwilling to receive.This paper presents another schemes, and relay is controlled by detection bus voltage value and is attracted.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of frequency converter charge relay actuation control dress is provided
It sets, when the end voltage U0 of charging resistor is more than or equal to actuation threshold voltage and d. c. voltage signal VDC no longer becomes larger, makes to charge
Relay is attracted, and had both been avoided charge relay from damaging because operating current is excessive, and had been also improved electrical efficiency；A kind of change is also provided
Frequency device charge relay is attracted control method, is avoided that charge relay is damaged because operating current is excessive, also improves and power on
Efficiency.
To achieve the above object, present invention employs following technical solutions:
A kind of frequency converter charge relay actuation control device comprising the main loop circuit 1 of frequency converter, busbar voltage inspection
Slowdown monitoring circuit 2, control relay circuit 3 and central processor CPU；The main loop circuit 1 includes the rectification circuit being sequentially connected
1a, power on buffer circuit 1b and IGBT inverter circuit 1c, power on buffer circuit 1b include be serially connected in two of rectification circuit 1a it is defeated
Charging resistor R22 and charging capacitor between outlet, charge relay RY1 are in parallel with charging resistor R22；The central processing unit
CPU is connected with busbar voltage detection circuit 2, control relay circuit 3 respectively, and busbar voltage detection circuit 2 detects charging capacitor
The end voltage U0 at both ends and to central processor CPU input direct-current voltage signal VDC, if end voltage U0, which is more than or equal to, is attracted threshold value
Voltage and d. c. voltage signal VDC no longer becomes larger, then central processor CPU passes through the control charging relay of control relay circuit 3
Device RY1 is attracted.
Preferably, the busbar voltage detection circuit 2 includes high resistant isolation circuit 2a and difference channel 2b, high resistant isolation electricity
Two input terminals of road 2a are connected with the both ends of charging capacitor respectively, and the output end of high resistant isolation circuit 2a is with difference channel 2b's
Input terminal is connected, and the output end of difference channel 2b is connected with the I/O of central processor CPU mouth, straight to central processor CPU input
Flow voltage signal VDC；The control relay circuit 3 includes optocoupler PC1 and triode Q1, central processor CPU and optocoupler PC1
It is connected, optocoupler PC1 is connected with triode Q1, and triode Q1 is connected with the coil of charge relay RY1；
The busbar voltage detection circuit 2 obtains the end voltage UO at charging capacitor both ends, by high resistant isolation circuit 2a and
Difference channel 2b to central processor CPU input direct-current voltage signal VDC, if end voltage U0 be more than or equal to be attracted threshold voltage and
D. c. voltage signal VDC no longer becomes larger, then central processor CPU leads optocoupler PC1 to optocoupler PCI incoming level signal REC
Logical, then triode Q1 is connected, and the coil of charge relay RY1 obtains electric, is attracted charge relay RY1；If holding voltage U0 small
Persistently becoming larger in actuation threshold voltage and/or d. c. voltage signal VDC, then central processor CPU leads optocoupler PC1 holding not
Logical, triode Q1 is not turned on, and the coil no current of charge relay RY1 flows through, and charge relay RY1 is remained open.
Preferably, the busbar voltage detection circuit 2 includes high resistance isolation circuit 2a, difference channel 2b, input terminal P3
It include operational amplifier U1A with input terminal N, difference channel 2b；
The high resistant isolation circuit 2a includes being serially connected between input terminal P3 and the normal phase input end of op-amp U1A
Multiple resistance, and the multiple resistance being serially connected between input terminal N and the inverting input terminal of operational amplifier U1A；
Resistance R16 and resistance R17, resistance R15 are in series between the normal phase input end and ground connection of the operational amplifier U1A
The both ends of resistance R16 and resistance R17 are connected in parallel on, capacitor C2 is connected in parallel on resistance R16 and the both ends resistance R17, operational amplifier U1A's
Be in series with resistance R18 between inverting input terminal and ground connection, the inverting input terminal of operational amplifier U1A by concatenated resistance R19,
Resistance R20 is connected with the output end of operational amplifier U1A, and capacitor C1 is connected in parallel on the both ends of resistance R19 and resistance R20, and operation is put
The output end of big device U1A is connected by resistance R21 with the I/O of central processor CPU mouth, and the section between R21 and I/O mouthfuls of resistance
Point is grounded by capacitor C6, and the cathode power supply end of operational amplifier U1A is grounded by capacitor C3, and negative electricity source passes through capacitor C4
Ground connection.
Preferably, the control relay circuit 3 includes optocoupler PC1 and triode Q1, the first foot and+5V of optocoupler PC1
Power supply is connected, and optocoupler PC1 crus secunda is connected by resistance R23 with central processor CPU, and the third foot of optocoupler PC1 passes through resistance
R24 is connected with the base stage of triode Q1, and the node between the third foot of optocoupler PC1 and the base stage of triode Q1 passes through resistance R25
Ground connection, the 4th foot of optocoupler PC1 are connected with 24V power supply, the emitter ground connection of triode Q1, the collector of triode Q1 and two poles
The anode of pipe D2 is connected, and the cathode of diode D2 is connected with 24V power supply, and the coil of charge relay RY1 is connected to triode Q1
Collector and 24V power supply between.
Preferably, the rectification circuit 1a includes full-wave rectification bridge D1；It is described power on buffer circuit 1b include resistance R22,
Charging capacitor, resistance R26 and resistance R27, charging capacitor include electrolytic capacitor E1 and electrolytic capacitor E2, resistance R22, electrolytic capacitor
E1, electrolytic capacitor E2 are sequentially connected in series between the cathode output end and cathode output end of rectification circuit 1, resistance R26 and electrolysis electricity
It is in parallel to hold E1, capacitor R27 is in parallel with electrolytic capacitor E2.
Preferably, the actuation threshold voltage is 400V.
A kind of frequency converter charge relay actuation control method, the main loop circuit 1 of the frequency converter include being sequentially connected
Rectification circuit 1a, power on buffer circuit 1b and IGBT inverter circuit 1c, powering on buffer circuit 1b includes being sequentially connected in series and rectifying
Charging resistor R22 and charging capacitor between two output ends of circuit 1a；The end voltage U0 at charging capacitor both ends is obtained, if end
Voltage U0 >=400V is then attracted charge relay RY1.
Frequency converter charge relay of the invention is attracted control device, and busbar voltage detection circuit 2 detects charging capacitor
The end voltage U0 (i.e. busbar voltage) at both ends and to central processor CPU input direct-current voltage signal VDC, and according to whether meeting
End voltage U0 is more than or equal to the condition that threshold voltage and d. c. voltage signal VDC no longer become larger that is attracted, and determines charge relay energy
No actuation, step is simple, and judging result precision is high, both charge relay is avoided to be attracted too early, and electric current crosses ambassador's charging relay
The case where device fails, also avoids the charging time too long, leads to power on that the waiting time is too long, and the low situation of user satisfaction guarantees
The high efficient and reliable work and stable operation of frequency converter.
Frequency converter charge relay of the invention is attracted control method, is avoided that charge relay due to operating current is excessive
Damage, also improves electrical efficiency.
Detailed description of the invention
Fig. 1 is the topological diagram of main loop circuit of the present invention；
Fig. 2 is the topological diagram of busbar voltage detection circuit of the present invention；
Fig. 3 is the topological diagram of invention relay control circuit；
Fig. 4 is that charge relay RY1 of the present invention is attracted immediate current waveform and DC bus-bar voltage waveform.
Specific embodiment
Below in conjunction with the embodiment that attached drawing 1-3 is provided, further illustrate that frequency converter charge relay of the invention is attracted control
The specific embodiment of device processed.Frequency converter charge relay of the invention is attracted control device and is not limited to retouching for following embodiment
It states.
Frequency converter charge relay of the invention is attracted control device comprising main loop circuit 1, the bus electricity of frequency converter
Press detection circuit 2, control relay circuit 3 and central processor CPU；The main loop circuit includes the rectified current being sequentially connected
Road 1a, buffer circuit 1b and IGBT inverter circuit 1c is powered on, powering on buffer circuit 1b includes two for being serially connected in rectification circuit 1a
Charging resistor R22 and charging capacitor between output end, charge relay RY1 are in parallel with charging resistor R22；The central processing
Device CPU is connected with busbar voltage detection circuit 2, control relay circuit 3 respectively, the detection charging electricity of busbar voltage detection circuit 2
Hold the end voltage U0 at both ends and to central processor CPU input direct-current voltage signal VDC, if end voltage U0, which is more than or equal to, is attracted threshold
Threshold voltage and d. c. voltage signal VDC no longer becomes larger, then central processor CPU by the control of control relay circuit 3 charging after
Electric appliance RY1 is attracted.
Frequency converter charge relay of the invention is attracted control device, and busbar voltage detection circuit 2 detects charging capacitor
The end voltage U0 (i.e. busbar voltage) at both ends and to central processor CPU input direct-current voltage signal VDC, and according to whether meeting
End voltage U0 is more than or equal to the condition that threshold voltage and d. c. voltage signal VDC no longer become larger that is attracted, and determines charge relay energy
No actuation, step is simple, and judging result precision is high, both charge relay is avoided to be attracted too early, and electric current crosses ambassador's charging relay
The case where device fails, also avoids the charging time too long, leads to power on that the waiting time is too long, and the low situation of user satisfaction guarantees
The high efficient and reliable work and stable operation of frequency converter.
Preferably, the actuation threshold voltage is 400V.Certainly according to actual needs (such as according to charge relay RY1
Type), be attracted threshold voltage can also be greater than 400V or be less than 400V.
As shown in Figure 1-3, being attracted one embodiment of control device for frequency converter charge relay of the present invention.
Frequency converter charge relay of the invention is attracted control device comprising main loop circuit 1, the bus electricity of frequency converter
Press detection circuit 2, control relay circuit 3 and central processor CPU；The main loop circuit 1 includes the rectification being sequentially connected
Circuit 1a, buffer circuit 1b and IGBT inverter circuit 1c is powered on, powering on buffer circuit 1b includes be serially connected in rectification circuit 1a two
Charging resistor R22 and charging capacitor between a output end, charge relay RY1 are in parallel with charging resistor R22；The centre
Reason device CPU is connected with busbar voltage detection circuit 2, control relay circuit 3 respectively, the detection charging of busbar voltage detection circuit 2
The end voltage U0 at capacitor both ends and to central processor CPU input direct-current voltage signal VDC, is attracted if end voltage U0 is more than or equal to
Threshold voltage and d. c. voltage signal VDC no longer becomes larger, then central processor CPU passes through the control charging of control relay circuit 3
Relay RY1 is attracted.
Preferably, the charging capacitor includes electrolytic capacitor E1, electrolytic capacitor E2, charging resistor R22, electrolytic capacitor E1 and
Electrolytic capacitor E2 is sequentially connected in series between the cathode output end and cathode output end of rectification circuit 1a.
Preferably, the busbar voltage detection circuit 2 includes high resistance isolation circuit 2a and difference channel 2b, high resistant isolation
Two input terminals of circuit 2a are connected with the both ends of charging capacitor respectively, the output end and difference channel 2b of high resistant isolation circuit 2a
Input terminal be connected, the output end of difference channel 2b is connected with the I/O of central processor CPU mouth, to central processor CPU input
D. c. voltage signal VDC；The control relay circuit 3 includes optocoupler PC1 and triode Q1, central processor CPU and optocoupler
PC1 is connected, and optocoupler PC1 is connected with triode Q1, and triode Q1 is connected with the coil of charge relay；The busbar voltage detection
Circuit 2 obtains the end voltage U0 at charging voltage both ends, by high resistant isolation circuit 2a and difference channel 2b to central processor CPU
Input direct-current voltage signal VDC, central processor CPU are determined according to the opposite end d. c. voltage signal VDC voltage UO: if end electricity
Pressure U0 is more than or equal to actuation threshold voltage and d. c. voltage signal VDC no longer becomes larger, then central processor CPU is defeated to optocoupler PC1
Enter level signal REC, level signal REC is high level signal, and optocoupler PC1 is connected, and then triode Q1 is connected, and charge relay
The coil of device RY1 obtain it is electric, make charge relay RY1 be attracted；If holding voltage U0 to be less than is attracted threshold voltage and/or DC voltage letter
Number VDC is persistently becoming larger, then central processor CPU to optocoupler PC1 incoming level signal REC, level signal REC be low level letter
Number, then optocoupler PC1 holding is not turned on, and triode Q1 is not turned on, and the coil no current of charge relay RY1 flows through, and charge relay
Device remains open.
Preferably, the actuation threshold voltage is 400V.Certainly according to actual needs (such as according to charge relay RY1
Model), be attracted threshold voltage can also be greater than 400V or be less than 400V.
Preferably, the method that the central processor CPU determines that d. c. voltage signal VDC no longer becomes larger is: in time t
Interior, central processor CPU detects that d. c. voltage signal VDC is constant, then illustrates that d. c. voltage signal VDC no longer becomes larger, t >
0s.Further, 0 < t≤1s or 1s < t≤60s, t can also be greater than 60s as needed certainly.
It is noted that between the d. c. voltage signal VDC and end voltage U0, there are following calculated relationships: VDC=
1000 3.3 × U0 of ÷, such as U0=1000V, VDC=3.3V；As U0=500V, VDC=1.65V；Namely when straight
When stream voltage signal VDC no longer becomes larger, it is meant that the end voltage at charging capacitor both ends also no longer becomes larger.
It should be pointed out that frequency converter charge relay of the invention is attracted control device, it is necessary to meet end electricity at the same time
Pressure U0 >=400V and d. c. voltage signal VDC no longer becomes larger, and charge relay RY1 can just be attracted, and reason is: when end voltage
U0 >=400V, and d. c. voltage signal VDC illustrates the voltage difference at the contact both ends of charge relay RY1 also when persistently becoming larger
It is larger, and electric current when voltage difference more big then charge relay RY1 actuation is bigger, when electric current is more than the contact charge relay RY1
Rated current when, easily burn contact；Opposite, when holding voltage U0 >=400V and d. c. voltage signal VDC no longer becomes larger,
The voltage difference for illustrating the contact both ends of charge relay RY1 is 0V, is at this time attracted charge relay RY1, then will not touch to it
Point damages.
Preferably, as shown in Fig. 2, the difference channel 2b includes operational amplifier U1A, the two of high resistance isolation circuit 2a
A input terminal is connected with the both ends of charging capacitor respectively, two output ends of high resistance isolation circuit 2a respectively with op-amp
The normal phase input end of U1A, inverting input terminal are connected, the I/O mouth phase of the output end and central processor CPU of operational amplifier U1A
Even.
Preferably, as shown in figure 3, the crus secunda of the optocoupler PC1 is connected with central processor CPU, the third of optocoupler PC1
Foot is connected with the base stage of triode Q1, and the collector of triode Q1 is connected with charge relay RY1.
Frequency converter charge relay of the invention is attracted control device, charging capacitor both ends end voltage U0 >=400V and
When d. c. voltage signal VDC is no longer attracted, it is ensured that it is small that charge relay RY1 is attracted charging resistor R22 both end voltage under moment
In 10V, thus guarantee charging transient flow through charge relay RY1 electric current it is smaller and be less than charge relay RY1 specified electricity
Stream.
As shown in figure 4, CH1 is that charge relay RY1 is attracted immediate current waveform, CH2 is DC bus-bar voltage waveform.Institute
Stating charge relay RY1 and being attracted front and back pressure difference is b-a=564V-560V=4V, and wherein a refers to that charge relay RY1 is attracted
Preceding DC bus-bar voltage, b refer to DC bus-bar voltage in charge relay attracting process, wave when charge relay RY1 is attracted
Shape maximum value is 336V, and the rated current of corresponding 16.8A, charge relay RY1 type selecting are 90A, therefore operating current is to charging
The influence of relay RY1 is smaller.Further, DC bus-bar voltage is gradually increasing in charging process.
It should be pointed out that frequency converter charge relay of the invention be attracted control device be for hand over-become-hand over type
The control of the charge relay of frequency converter.
As shown in Figure 1, one embodiment of the main loop circuit 1 for frequency converter of the invention.
As shown in Figure 1, the main loop circuit 1 include be sequentially connected rectification circuit 1a, power on buffer circuit 1b and
IGBT inverter circuit；The rectification circuit 1a includes full-wave rectification bridge D1, and full-wave rectification bridge D1 includes cathode output end and cathode
Output end；The buffer circuit 1b that powers on includes charging between the cathode output end and cathode output end for being serially connected in rectification circuit 1a
Resistance R22 and charging capacitor and resistance R27 and resistance R26, charging capacitor include electrolytic capacitor E1 and electrolytic capacitor E2, are filled
Resistance R22, electrolytic capacitor E1 and electrolytic capacitor E2 are sequentially connected in series cathode output end and cathode output end in rectification circuit 1a
Between, the one end charging resistor R22 is connected with the anode of electrolytic capacitor E1, the cathode of electrolytic capacitor E1 and the anode of electrolytic capacitor E2
It is connected, the cathode of electrolytic capacitor E2 is connected with the cathode output end of rectification circuit 1a, and resistance R26 is in parallel with electrolytic capacitor E1, electricity
It is in parallel with electrolytic capacitor E2 to hinder R27；Two output ends for powering on buffer circuit 1b respectively with IGBT inverter circuit 1c two
A input terminal is connected.
Preferably, the charging resistor R22, electrolytic capacitor E1, electrolytic capacitor E2 constitute filter circuit, can effectively filter out by
The bigger peak voltage generated after the rectified circuit rectifies of network voltage, can effectively avoid peak voltage and makes to component
At damage.
As shown in Fig. 2, being one embodiment of busbar voltage detection circuit 2 of the invention.
As shown in Fig. 2, the busbar voltage detection circuit 2 includes high resistance isolation circuit 2a and difference channel 2b, input
P3 and input terminal N is held, difference channel 2b includes operational amplifier U1A；The high resistant isolation circuit 2a includes being serially connected in input terminal
Resistance R1, R2, R3, R4, R5, R6, R7 between P3 and the normal phase input end of op-amp U1A, and it is serially connected in input terminal N
Resistance R8, R9, R10, R11, R12, R13, R14 between the inverting input terminal of operational amplifier U1A；The operational amplifier
The operating voltage of U1A is 15V, and resistance R17 and resistance R16 are serially connected between the normal phase input end and ground connection of operational amplifier, electricity
Resistance R15 is connected in parallel on resistance R16 and the both ends resistance R17, and (i.e. the both ends resistance R15 are defeated with ground connection, the positive of operational amplifier U1A respectively
Enter end to be connected), capacitor C2 be connected in parallel on resistance R16 and resistance R17 both ends (i.e. the both ends of capacitor C2 respectively with ground connection, operation puts
The normal phase input end of big device U1A is connected), it is serially connected with resistance R18 between the inverting input terminal and ground connection of operational amplifier U1A, transports
The inverting input terminal for calculating amplifier U1A is connected by resistance R19, the resistance R20 of concatenation with the output end of operational amplifier U1A,
Capacitor C1 is connected in parallel on the both ends of resistance R19 and resistance R20, and (i.e. the both ends of capacitor C1 are defeated with the reverse phase of operational amplifier U1A respectively
Enter end, output end is connected), the output end of operational amplifier U1A is connected by resistance R21 with the I/O of central processor CPU mouth,
And the node between R21 and I/O mouthfuls of resistance is grounded by capacitor C6, the cathode power supply end of operational amplifier U1A passes through capacitor C3
Ground connection, negative electricity source are grounded by capacitor C4.
As shown in figure 3, being one embodiment of invention relay control circuit 3.
As shown in figure 3, the control relay circuit 3 include optocoupler PC1 and triode Q1, the first foot of optocoupler PC1 with+
5V power supply is connected, and the crus secunda of optocoupler PC1 is connected by resistance R23 with central processor CPU, for receiving central processing unit
The third foot of the level signal REC of CPU output, optocoupler PC1 are connected by resistance R24 with the base stage of triode Q1, optocoupler PC1's
Node between third foot and the base stage of triode Q1 is grounded by resistance R25, and the 4th foot of optocoupler PC1 is connected with 24V power supply,
The emitter of triode Q1 is grounded, and the collector of triode Q1 is connected with the anode of diode D2, the cathode and 24V of diode D2
Power supply is connected, and the coil of charge relay RY1 is connected between the collector of triode Q1 and 24V power supply.
Preferably, the central processor CPU, which can be, is exclusively used in sentencing terminal voltage U0 according to d. c. voltage signal VDC and being
The no chip greater than 400V is also possible to the intrinsic chip of frequency converter.Central processor CPU of the invention preferably uses frequency converter
Intrinsic chip, be conducive to save apparatus of the present invention cost.It can additionally be realized using comparison circuit, DC voltage is believed
Number VDC is compared with reference voltage, gives 3 transmission of control signals of control relay circuit.Further, the central processing unit
CPU is mainly used for PWM driving algorithm, AD sampling, SPI communication, 485 communications, external input output control etc..Further, institute
State central processor CPU be dsp chip, model TMS320F2406 or TMS320F24076 or TMS320F2808 or
TMS320F28035。
Invention additionally discloses a kind of frequency converter charge relays to be attracted control method, the main loop circuit 1 of the frequency converter
Including be sequentially connected rectification circuit 1a, power on buffer circuit 1b and IGBT inverter circuit 1c, power on buffer circuit 1b include according to
Charging resistor R22 and charging capacitor between secondary two output ends for being serially connected in rectification circuit 1a；Obtain charging capacitor both ends
Voltage U0 is held, if end voltage U0 >=400V, is attracted charge relay RY1.
Preferably, frequency converter charge relay of the invention is attracted control method, and the busbar voltage detection electricity can be used
Road 2 obtains the end voltage U0 of charging capacitor, and control relay circuit 3 can be used and control charge relay RY1 actuation.Certainly, also
The end voltage of charging capacitor can be obtained by the circuit of other forms and controls the actuation of charge relay RY1.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (7)
1. a kind of frequency converter charge relay is attracted control device, which is characterized in that it includes the main loop circuit of frequency converter
(1), busbar voltage detection circuit (2), control relay circuit (3) and central processor CPU；Main loop circuit (1) packet
It includes the rectification circuit (1a) being sequentially connected, power on buffer circuit (1b) and IGBT inverter circuit (1c), power on buffer circuit (1b)
Including the charging resistor R22 and charging capacitor being serially connected between two output ends of rectification circuit 1a, charge relay RY1 with fill
Resistance R22 is in parallel；The central processor CPU respectively with busbar voltage detection circuit (2), control relay circuit (3) phase
Even, busbar voltage detection circuit (2) detects the end voltage U0 at charging capacitor both ends and to central processor CPU input direct-current voltage
Signal VDC, if end voltage U0 is more than or equal to actuation threshold voltage and d. c. voltage signal VDC no longer becomes larger, central processing unit
CPU controls charge relay RY1 by control relay circuit (3) and is attracted.
2. frequency converter charge relay according to claim 1 is attracted control device, it is characterised in that: the busbar voltage
Detection circuit (2) includes high resistant isolation circuit (2a) and difference channel (2b), two input terminals point of high resistant isolation circuit (2a)
It is not connected with the both ends of charging capacitor, the output end of high resistant isolation circuit (2a) is connected with the input terminal of difference channel (2b), poor
The output end of parallel circuit (2b) is connected with the I/O of central processor CPU mouth, to central processor CPU input direct-current voltage signal
VDC；The control relay circuit (3) includes optocoupler PC1 and triode Q1, and central processor CPU is connected with optocoupler PC1, light
Coupling PC1 is connected with triode Q1, and triode Q1 is connected with the coil of charge relay RY1；
The busbar voltage detection circuit (2) obtains the end voltage UO at charging capacitor both ends, by high resistant isolation circuit (2a) and
Difference channel (2b) is to central processor CPU input direct-current voltage signal VDC, if end voltage U0, which is more than or equal to, is attracted threshold voltage
And d. c. voltage signal VDC no longer becomes larger, then central processor CPU leads optocoupler PC1 to optocoupler PCI incoming level signal REC
Logical, then triode Q1 is connected, and the coil of charge relay RY1 obtains electric, is attracted charge relay RY1；If holding voltage U0 small
Persistently becoming larger in actuation threshold voltage and/or d. c. voltage signal VDC, then central processor CPU leads optocoupler PC1 holding not
Logical, triode Q1 is not turned on, and the coil no current of charge relay RY1 flows through, and charge relay RY1 is remained open.
3. frequency converter charge relay according to claim 1 or 2 is attracted control device, it is characterised in that: the bus
Voltage detecting circuit (2) includes high resistance isolation circuit (2a), difference channel (2b), input terminal P3 and input terminal N, difference channel
(2b) includes operational amplifier U1A；
The high resistant isolation circuit (2a) include be serially connected in it is more between input terminal P3 and the normal phase input end of op-amp U1A
A resistance, and the multiple resistance being serially connected between input terminal N and the inverting input terminal of operational amplifier U1A；
Resistance R16 and resistance R17 are in series between the normal phase input end and ground connection of the operational amplifier U1A, resistance R15 is in parallel
At the both ends of resistance R16 and resistance R17, capacitor C2 is connected in parallel on resistance R16 and the both ends resistance R17, the reverse phase of operational amplifier U1A
Resistance R18 is in series between input terminal and ground connection, the inverting input terminal of operational amplifier U1A passes through concatenated resistance R19, resistance
R20 is connected with the output end of operational amplifier U1A, and capacitor C1 is connected in parallel on the both ends of resistance R19 and resistance R20, operational amplifier
The output end of U1A is connected by resistance R21 with the I/O of central processor CPU mouth, and the node between R21 and I/O mouthfuls of resistance is logical
Capacitor C6 ground connection is crossed, the cathode power supply end of operational amplifier U1A is grounded by capacitor C3, and negative electricity source is connect by capacitor C4
Ground.
4. frequency converter charge relay according to claim 1 or 2 is attracted control device, it is characterised in that: the relay
Device control circuit (3) includes optocoupler PC1 and triode Q1, and the first foot of optocoupler PC1 is connected with+5V power supply, optocoupler PC1 crus secunda
It is connected by resistance R23 with central processor CPU, the third foot of optocoupler PC1 passes through the base stage phase of resistance R24 and triode Q1
Even, the node between the third foot of optocoupler PC1 and the base stage of triode Q1 is grounded by resistance R25, the 4th foot of optocoupler PC1 and
24V power supply is connected, and the emitter ground connection of triode Q1, the collector of triode Q1 is connected with the anode of diode D2, diode
The cathode of D2 is connected with 24V power supply, and the coil of charge relay RY1 is connected between the collector of triode Q1 and 24V power supply.
5. frequency converter charge relay according to claim 1 or 2 is attracted control device, it is characterised in that: the rectification
Circuit (1a) includes full-wave rectification bridge D1；The buffer circuit (1b) that powers on includes resistance R22, charging capacitor, resistance R26 and electricity
R27 is hindered, charging capacitor includes electrolytic capacitor E1 and electrolytic capacitor E2, and resistance R22, electrolytic capacitor E1, electrolytic capacitor E2 successively go here and there
Connect between the cathode output end and cathode output end of rectification circuit (1), resistance R26 is in parallel with electrolytic capacitor E1, capacitor R27 with
Electrolytic capacitor E2 is in parallel.
6. frequency converter charge relay according to claim 1 or 2 is attracted control device, it is characterised in that: the actuation
Threshold voltage is 400V.
7. a kind of frequency converter charge relay is attracted control method, the main loop circuit (1) of the frequency converter includes being sequentially connected
Rectification circuit (1a), power on buffer circuit (1b) and IGBT inverter circuit (1c), power on buffer circuit (1b) include successively go here and there
Meet the charging resistor R22 and charging capacitor between two output ends of rectification circuit (1a)；It is characterized by: obtaining charging electricity
Hold the end voltage U0 at both ends, if end voltage U0 >=400V, is attracted charge relay RY1.
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| CN201910482705.4A CN110233578A (en) | 2019-06-04 | 2019-06-04 | Frequency converter charge relay is attracted control device and control method |
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| CN201910482705.4A CN110233578A (en) | 2019-06-04 | 2019-06-04 | Frequency converter charge relay is attracted control device and control method |
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Cited By (1)
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| CN114421429A (en) * | 2022-01-20 | 2022-04-29 | 青岛海信日立空调系统有限公司 | Frequency converter protection device, frequency converter and air conditioner |
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