CN210093113U - Suction control device for charging relay of frequency converter - Google Patents
Suction control device for charging relay of frequency converter Download PDFInfo
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- CN210093113U CN210093113U CN201920857844.6U CN201920857844U CN210093113U CN 210093113 U CN210093113 U CN 210093113U CN 201920857844 U CN201920857844 U CN 201920857844U CN 210093113 U CN210093113 U CN 210093113U
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Abstract
The utility model relates to a power electronic technology field, concretely relates to converter charging relay actuation controlling means, wherein central processing unit CPU respectively with bus voltage detection circuit, relay control circuit links to each other, bus voltage detection circuit detects the terminal voltage U0 at charging capacitor both ends and inputs direct current voltage signal VDC to central processing unit CPU, if terminal voltage U0 more than or equal to actuation threshold voltage and direct current voltage signal VDC are no longer the grow, then central processing unit CPU passes through relay control circuit control charging relay RY1 actuation, both avoid charging relay to damage because of the actuation electric current is too big, the last electric efficiency that has also improved.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to converter charging relay actuation controlling means.
Background
The frequency converter can be divided into an ac-ac frequency converter and an ac-dc-ac frequency converter according to the conversion mode, and at present, the frequency converter of the ac-dc-ac conversion mode is commonly used. The main loop circuit of the AC-DC-AC frequency converter comprises a rectifying circuit, an electrifying buffer circuit and an inverter circuit.
Because the grid voltage has bigger peak voltage after the rectification, in order to avoid the peak voltage to cause damage to components, need to collocate and go up electric buffer circuit and carry out the filtering to the generating line after the rectification, at this moment trigger relay actuation and just appeared two kinds of judgement modes, a mode is for judging according to the charge time, but because different power charge time is different, relay actuation too early can cause relay actuation electric current too big and lose efficacy easily, relay actuation too late can lead to going up the electric latency overlength, the customer is unwilling to accept. Another solution is proposed, which controls the relay pull-in by detecting the bus voltage value.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a converter charging relay actuation controlling means, when charging resistor's terminal voltage U0 more than or equal to actuation threshold voltage and direct current voltage signal VDC grow no longer, make charging relay actuation, both avoided charging relay to damage because of the actuation electric current is too big, also improved last electric efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a frequency converter charging relay actuation control device comprises a main loop circuit 1 of a frequency converter, a bus voltage detection circuit 2, a relay control circuit 3 and a Central Processing Unit (CPU); the main loop circuit 1 comprises a rectifying circuit 1a, an electrifying buffer circuit 1b and an IGBT inverter circuit 1c which are sequentially connected, the electrifying buffer circuit 1b comprises a charging resistor R22 and a charging capacitor which are connected between two output ends of the rectifying circuit 1a in series, and a charging relay RY1 is connected with the charging resistor R22 in parallel; the central processing unit CPU is respectively connected with the bus voltage detection circuit 2 and the relay control circuit 3, the bus voltage detection circuit 2 detects the terminal voltage U0 at two ends of the charging capacitor and inputs a direct current voltage signal VDC to the central processing unit CPU, and if the terminal voltage U0 is larger than or equal to the pull-in threshold voltage and the direct current voltage signal VDC is not increased any more, the central processing unit CPU controls the pull-in of the charging relay RY1 through the relay control circuit 3.
Preferably, the bus voltage detection circuit 2 includes a high-resistance isolation circuit 2a and a differential circuit 2b, two input ends of the high-resistance isolation circuit 2a are respectively connected with two ends of the charging capacitor, an output end of the high-resistance isolation circuit 2a is connected with an input end of the differential circuit 2b, an output end of the differential circuit 2b is connected with an I/O port of the central processing unit CPU, and a direct-current voltage signal VDC is input to the central processing unit CPU; the relay control circuit 3 comprises an optocoupler PC1 and a triode Q1, a Central Processing Unit (CPU) is connected with the optocoupler PC1, the optocoupler PC1 is connected with a triode Q1, and the triode Q1 is connected with a coil of a charging relay RY 1;
the bus voltage detection circuit 2 acquires terminal voltages UO at two ends of a charging capacitor, a direct current voltage signal VDC is input to a Central Processing Unit (CPU) through a high-resistance isolation circuit 2a and a differential circuit 2b, if the terminal voltage U0 is larger than or equal to an attraction threshold voltage and the direct current voltage signal VDC is not increased any more, the central processing unit CPU inputs a level signal REC to an optocoupler PCI to enable an optocoupler PC1 to be conducted, then a triode Q1 is conducted, a coil of a charging relay RY1 is electrified, and the charging relay RY1 is attracted; if the terminal voltage U0 is smaller than the pull-in threshold voltage and/or the direct current voltage signal VDC continuously increases, the central processing unit CPU enables the optocoupler PC1 to be kept non-conductive, the triode Q1 is not conductive, no current flows through a coil of the charging relay RY1, and the charging relay RY1 is kept disconnected.
Preferably, the bus voltage detection circuit 2 includes a high-resistance isolation circuit 2a, a differential circuit 2b, an input terminal P3 and an input terminal N, and the differential circuit 2b includes an operational amplifier U1A;
the high-resistance isolation circuit 2a comprises a plurality of resistors connected in series between the input terminal P3 and the non-inverting input terminal of the budget amplifier U1A, and a plurality of resistors connected in series between the input terminal N and the inverting input terminal of the operational amplifier U1A;
a resistor R16 and a resistor R17 are connected in series between a positive phase input end of the operational amplifier U1A and the ground, a resistor R15 is connected in parallel at two ends of a resistor R16 and a resistor R17, a capacitor C2 is connected in parallel at two ends of a resistor R16 and a resistor R17, a resistor R18 is connected in series between an inverting input end of the operational amplifier U1A and the ground, an inverting input end of the operational amplifier U1A is connected with an output end of the operational amplifier U1A through a resistor R19 and a resistor R20 which are connected in series, a capacitor C1 is connected in parallel at two ends of a resistor R19 and a resistor R20, an output end of the operational amplifier U1A is connected with an I/O port of the CPU through a resistor R21, a node between the resistor R21 and the I/O port is grounded through a capacitor C6, a positive power supply end of the operational amplifier U1A is grounded through a capacitor C36.
Preferably, the relay control circuit 3 includes an optocoupler PC1 and a transistor Q1, a first pin of the optocoupler PC1 is connected to the +5V power supply, a second pin of the optocoupler PC1 is connected to the central processing unit CPU through a resistor R23, a third pin of the optocoupler PC1 is connected to the base of the transistor Q1 through a resistor R24, a node between the third pin of the optocoupler PC1 and the base of the transistor Q1 is grounded through a resistor R25, a fourth pin of the optocoupler PC1 is connected to the 24V power supply, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to the 24V power supply, and a coil of the charging relay 1 is connected between the collector of the transistor Q1 and the RY 24V power supply.
Preferably, the rectifier circuit 1a includes a full-wave rectifier bridge D1; the power-on buffer circuit 1b comprises a resistor R22, a charging capacitor, a resistor R26 and a resistor R27, the charging capacitor comprises an electrolytic capacitor E1 and an electrolytic capacitor E2, the resistor R22, the electrolytic capacitor E1 and the electrolytic capacitor E2 are sequentially connected in series between the positive output end and the negative output end of the rectifying circuit 1a, the resistor R26 is connected in parallel with the electrolytic capacitor E1, and the capacitor R27 is connected in parallel with the electrolytic capacitor E2.
Preferably, the pull-in threshold voltage is 400V.
The utility model discloses a converter charging relay actuation controlling means, its bus voltage detection circuit 2 detects the terminal voltage U0 (being the bus voltage) at charging capacitor both ends and to central processing unit CPU input direct current voltage signal VDC, and whether satisfy the condition of terminal voltage U0 more than or equal to actuation threshold voltage and direct current voltage signal VDC grow no longer according to, judge whether charging relay can the actuation, the step is simple, the judgement result precision is high, both avoid charging relay too early actuation, the too big condition that makes charging relay lose efficacy of electric current, also avoid the charge time overlength, lead to going up the electricity latency overlength, the low condition of user satisfaction, the high-efficient reliable work and the steady operation of converter have been guaranteed.
Drawings
FIG. 1 is a topology diagram of the main loop circuit of the present invention;
FIG. 2 is a topology diagram of the bus voltage detection circuit of the present invention;
fig. 3 is a topological diagram of the relay control circuit of the present invention;
fig. 4 shows the pull-in instantaneous current waveform and dc bus voltage waveform of the charging relay RY1 of the present invention.
Detailed Description
The following further describes a specific implementation manner of the suction control device of the charging relay of the frequency converter according to the embodiment shown in fig. 1 to 3. The utility model discloses a converter charging relay actuation controlling means is not limited to the description of following embodiment.
The utility model discloses a frequency converter charging relay actuation control device, which comprises a main loop circuit 1 of a frequency converter, a bus voltage detection circuit 2, a relay control circuit 3 and a central processing unit CPU; the main loop circuit comprises a rectifying circuit 1a, an electrifying buffer circuit 1b and an IGBT inverter circuit 1c which are sequentially connected, the electrifying buffer circuit 1b comprises a charging resistor R22 and a charging capacitor which are connected between two output ends of the rectifying circuit 1a in series, and a charging relay RY1 is connected with the charging resistor R22 in parallel; the central processing unit CPU is respectively connected with the bus voltage detection circuit 2 and the relay control circuit 3, the bus voltage detection circuit 2 detects the terminal voltage U0 at two ends of the charging capacitor and inputs a direct current voltage signal VDC to the central processing unit CPU, and if the terminal voltage U0 is larger than or equal to the pull-in threshold voltage and the direct current voltage signal VDC is not increased any more, the central processing unit CPU controls the pull-in of the charging relay RY1 through the relay control circuit 3.
The utility model discloses a converter charging relay actuation controlling means, its bus voltage detection circuit 2 detects the terminal voltage U0 (being the bus voltage) at charging capacitor both ends and to central processing unit CPU input direct current voltage signal VDC, and whether satisfy the condition of terminal voltage U0 more than or equal to actuation threshold voltage and direct current voltage signal VDC grow no longer according to, judge whether charging relay can the actuation, the step is simple, the judgement result precision is high, both avoid charging relay too early actuation, the too big condition that makes charging relay lose efficacy of electric current, also avoid the charge time overlength, lead to going up the electricity latency overlength, the low condition of user satisfaction, the high-efficient reliable work and the steady operation of converter have been guaranteed.
Preferably, the pull-in threshold voltage is 400V. Of course, the pull-in threshold voltage may be larger than 400V or smaller than 400V according to actual needs (for example, according to the type of the charging relay RY 1).
As shown in fig. 1-3, it is an embodiment of the suction control device for the charging relay of the frequency converter of the present invention.
The utility model discloses a frequency converter charging relay actuation control device, which comprises a main loop circuit 1 of a frequency converter, a bus voltage detection circuit 2, a relay control circuit 3 and a central processing unit CPU; the main loop circuit 1 comprises a rectifying circuit 1a, an electrifying buffer circuit 1b and an IGBT inverter circuit 1c which are sequentially connected, the electrifying buffer circuit 1b comprises a charging resistor R22 and a charging capacitor which are connected between two output ends of the rectifying circuit 1a in series, and a charging relay RY1 is connected with the charging resistor R22 in parallel; the central processing unit CPU is respectively connected with the bus voltage detection circuit 2 and the relay control circuit 3, the bus voltage detection circuit 2 detects the terminal voltage U0 at two ends of the charging capacitor and inputs a direct current voltage signal VDC to the central processing unit CPU, and if the terminal voltage U0 is larger than or equal to the pull-in threshold voltage and the direct current voltage signal VDC is not increased any more, the central processing unit CPU controls the pull-in of the charging relay RY1 through the relay control circuit 3.
Preferably, the charging capacitor comprises an electrolytic capacitor E1 and an electrolytic capacitor E2, and the charging resistor R22, the electrolytic capacitor E1 and the electrolytic capacitor E2 are sequentially connected in series between the positive output end and the negative output end of the rectifying circuit 1 a.
Preferably, the bus voltage detection circuit 2 includes a high-resistance isolation circuit 2a and a differential circuit 2b, two input ends of the high-resistance isolation circuit 2a are respectively connected with two ends of the charging capacitor, an output end of the high-resistance isolation circuit 2a is connected with an input end of the differential circuit 2b, an output end of the differential circuit 2b is connected with an I/O port of the central processing unit CPU, and a direct-current voltage signal VDC is input to the central processing unit CPU; the relay control circuit 3 comprises an optocoupler PC1 and a triode Q1, a central processing unit CPU is connected with the optocoupler PC1, the optocoupler PC1 is connected with a triode Q1, and a triode Q1 is connected with a coil of the charging relay; the bus voltage detection circuit 2 obtains terminal voltages U0 at two ends of the charging voltage, a direct current voltage signal VDC is input to the central processing unit CPU through the high-resistance isolation circuit 2a and the differential circuit 2b, and the central processing unit CPU judges an end voltage UO according to the direct current voltage signal VDC: if the terminal voltage U0 is greater than or equal to the pull-in threshold voltage and the direct-current voltage signal VDC is not increased any more, the central processing unit CPU inputs a level signal REC to the optical coupler PC1, the level signal REC is a high level signal, the optical coupler PC1 is conducted, then the triode Q1 is conducted, a coil of the charging relay RY1 is electrified, and the charging relay RY1 is pulled in; if the terminal voltage U0 is smaller than the pull-in threshold voltage and/or the direct current voltage signal VDC continuously increases, the central processing unit CPU inputs a level signal REC to the optical coupler PC1, the level signal REC is a low level signal, the optical coupler PC1 is kept to be not conducted, the triode Q1 is not conducted, no current flows through a coil of the charging relay RY1, and the charging relay is kept to be disconnected.
Preferably, the pull-in threshold voltage is 400V. Of course, the pull-in threshold voltage can also be larger than 400V or smaller than 400V according to actual needs (for example, according to the model of the charging relay RY 1).
Preferably, the method for the central processing unit CPU to determine that the dc voltage signal VDC is no longer increased is: within the time t, the central processing unit CPU detects that the direct-current voltage signal VDC is not changed, which indicates that the direct-current voltage signal VDC is not increased any more, and t > 0 s. Further, t is more than 0 and less than or equal to 1s, or t is more than or equal to 1s and less than or equal to 60s, and t can be more than 60s according to needs.
It should be noted that the following calculation relationship exists between the dc voltage signal VDC and the terminal voltage U0: VDC 1000 ÷ 3.3 × U0, for example when U0 ═ 1000V, VDC ═ 3.3V; when U0 is 500V, VDC is 1.65V; that is, when the dc voltage signal VDC no longer becomes large, it means that the terminal voltage across the charging capacitor is no longer large.
It should be noted that, the utility model discloses a converter charging relay actuation controlling means must satisfy terminal voltage U0 simultaneously and be greater than or equal to 400V and direct current voltage signal VDC grow no longer, just enables charging relay RY1 actuation, and the reason lies in: when the terminal voltage U0 is larger than or equal to 400V and the direct-current voltage signal VDC is continuously increased, the voltage difference between two ends of the contact of the charging relay RY1 is larger, the larger the voltage difference is, the larger the current is when the charging relay RY1 is attracted, and when the current exceeds the rated current of the contact of the charging relay RY1, the contact is easy to burn; on the contrary, when the terminal voltage U0 is greater than or equal to 400V and the dc voltage signal VDC is not increased, it indicates that the voltage difference between the two ends of the contact of the charging relay RY1 is 0V, and at this time, the charging relay RY1 is attracted, and the contact is not damaged.
Preferably, as shown in fig. 2, the differential circuit 2b includes an operational amplifier U1A, two input terminals of the high-resistance isolation circuit 2a are respectively connected to two ends of the charging capacitor, two output terminals of the high-resistance isolation circuit 2a are respectively connected to a non-inverting input terminal and an inverting input terminal of the budget amplifier U1A, and an output terminal of the operational amplifier U1A is connected to an I/O port of the central processing unit CPU.
Preferably, as shown in fig. 3, a second pin of the optocoupler PC1 is connected to the central processing unit CPU, a third pin of the optocoupler PC1 is connected to a base of a transistor Q1, and a collector of the transistor Q1 is connected to the charging relay RY 1.
The utility model discloses a converter charging relay actuation controlling means, when the terminal voltage U0 at charging capacitor both ends is no longer more than 400V and direct current voltage signal VDC is not inhaled, guaranteed that charging relay RY1 actuation is charging resistor R22 both ends voltage is less than 10V down in the twinkling of an eye to guarantee to charge the less rated current that just is less than charging relay RY1 of the electric current that flows through charging relay RY1 in the twinkling of an eye.
As shown in fig. 4, CH1 is a charging relay RY1 pull-in instantaneous current waveform, and CH2 is a dc bus voltage waveform. The differential pressure before and after the pull-in of the charging relay RY1 is b-a 564V-560V 4V, wherein a refers to the direct current bus voltage before the pull-in of the charging relay RY1, b refers to the direct current bus voltage in the pull-in process of the charging relay RY, the maximum value of the waveform of the charging relay RY1 during the pull-in is 336V, corresponding to 16.8A, and the rated current of the type selection of the charging relay RY1 is 90A, so the influence of the pull-in current on the charging relay RY1 is small. Further, the voltage of the direct current bus is gradually increased in the charging process.
It should be pointed out that the utility model discloses a converter charging relay actuation control device is the control that is used for handing over-becoming-handing over the charging relay of the converter of type.
As shown in fig. 1, the present invention is an embodiment of a main loop circuit 1 of a frequency converter.
As shown in fig. 1, the main loop circuit 1 includes a rectifying circuit 1a, an electrifying buffer circuit 1b and an IGBT inverter circuit, which are connected in sequence; the rectification circuit 1a comprises a full-wave rectification bridge D1, and the full-wave rectification bridge D1 comprises a positive electrode output end and a negative electrode output end; the power-on buffer circuit 1b comprises a charging resistor R22 and a charging capacitor, a resistor R27 and a resistor R26 which are connected in series between the positive output end and the negative output end of the rectifying circuit 1a, the charging capacitor comprises an electrolytic capacitor E1 and an electrolytic capacitor E2, a charging resistor R22, an electrolytic capacitor E1 and an electrolytic capacitor E2 are sequentially connected in series between the positive output end and the negative output end of the rectifying circuit 1a, one end of the charging resistor R22 is connected with the positive electrode of the electrolytic capacitor E1, the negative electrode of the electrolytic capacitor E1 is connected with the positive electrode of the electrolytic capacitor E2, the negative electrode of the electrolytic capacitor E2 is connected with the negative output end of the rectifying circuit 1a, the resistor R26 is connected with the electrolytic capacitor E1 in parallel, and the resistor R27 is connected with the; and two output ends of the power-on buffer circuit 1b are respectively connected with two input ends of the IGBT inverter circuit 1 c.
Preferably, the charging resistor R22, the electrolytic capacitor E1, and the electrolytic capacitor E2 constitute a filter circuit, which can effectively filter a relatively large peak voltage generated after the grid voltage is rectified by the rectifier circuit, and can effectively prevent the component from being damaged by the peak voltage.
Fig. 2 shows an embodiment of the bus voltage detection circuit 2 according to the present invention.
As shown in fig. 2, the bus voltage detection circuit 2 includes a high-resistance isolation circuit 2a and a differential circuit 2b, an input terminal P3 and an input terminal N, the differential circuit 2b includes an operational amplifier U1A; the high-resistance isolation circuit 2a comprises resistors R1, R2, R3, R4, R5, R6 and R7 which are connected in series between the input end P3 and the non-inverting input end of the budget amplifier U1A, and resistors R8, R9, R10, R11, R12, R13 and R14 which are connected in series between the input end N and the inverting input end of the operational amplifier U1A; the operating voltage of the operational amplifier U1A is 15V, a resistor R17 and a resistor R16 are connected in series between the non-inverting input terminal of the operational amplifier and the ground, the resistor R15 is connected in parallel to both ends of the resistor R16 and the resistor R17 (i.e. both ends of the resistor R15 are connected to the ground and the non-inverting input terminal of the operational amplifier U1A respectively), a capacitor C2 is connected in parallel to both ends of the resistor R16 and the resistor R17 (i.e. both ends of the capacitor C2 are connected to the ground and the non-inverting input terminal of the operational amplifier U1A respectively), a resistor R18 is connected in series between the inverting input terminal of the operational amplifier U1A and the ground, the inverting input terminal of the operational amplifier U1A is connected to the output terminal of the operational amplifier U1A through the serially connected resistor R19 and the resistor R20, a capacitor C1 is connected in parallel to both ends of the resistor R19 and the resistor R20 (I20 respectively) and the CPU I/O port of the operational amplifier U1 20, and the node between the resistor R21 and the I/O port is grounded through a capacitor C6, the anode power supply end of the operational amplifier U1A is grounded through a capacitor C3, and the cathode power supply end is grounded through a capacitor C4.
As shown in fig. 3, the present invention is an embodiment of the relay control circuit 3.
As shown in fig. 3, the relay control circuit 3 includes an optocoupler PC1 and a transistor Q1, a first pin of the optocoupler PC1 is connected to a +5V power supply, a second pin of the optocoupler PC1 is connected to the central processing unit CPU through a resistor R23 and is configured to receive a level signal REC output by the central processing unit CPU, a third pin of the optocoupler PC1 is connected to a base of the transistor Q1 through a resistor R24, a node between the third pin of the optocoupler PC1 and a base of the transistor Q1 is grounded through a resistor R25, a fourth pin of the optocoupler PC1 is connected to a 24V power supply, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is connected to an anode of a diode D2, a cathode of the diode D2 is connected to the 24V power supply, and a coil of the charging relay RY1 is connected between the collector of the transistor Q1 and.
Preferably, the central processing unit CPU may be a chip dedicated to determining whether the terminal voltage U0 is greater than 400V according to the dc voltage signal VDC, or may be an inherent chip of the inverter. The utility model discloses a central processing unit CPU preferably adopts the inherent chip of converter, is favorable to practicing thrift the utility model discloses the cost of device. In addition, a comparison circuit may be used to compare the dc voltage signal VDC with a reference voltage and transmit a control signal to the relay control circuit 3. Further, the central processing unit CPU is mainly used for PWM driving algorithm, AD sampling, SPI communication, 485 communication, external input output control, and the like. Further, the central processing unit CPU is a DSP chip, and its model is TMS320F2406, TMS320F24076, TMS320F2808, or TMS320F 28035.
The utility model also discloses a frequency converter charging relay actuation control method, the main loop circuit 1 of the frequency converter comprises a rectifying circuit 1a, an upper electricity buffer circuit 1b and an IGBT inverter circuit 1c which are connected in sequence, the upper electricity buffer circuit 1b comprises a charging resistor R22 and a charging capacitor which are connected in series between two output ends of the rectifying circuit 1a in sequence; and acquiring terminal voltage U0 at two ends of the charging capacitor, and attracting the charging relay RY1 if the terminal voltage U0 is more than or equal to 400V.
Preferably, the utility model discloses a converter charging relay actuation control method can adopt bus voltage detection circuit 2 acquires charging capacitor's terminal voltage U0, can adopt relay control circuit 3 control charging relay RY1 actuation. Of course, the terminal voltage of the charging capacitor and the pull-in of the charging relay RY1 can also be obtained through other forms of circuits.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A suction control device of a charging relay of a frequency converter is characterized by comprising a main loop circuit (1) of the frequency converter, a bus voltage detection circuit (2), a relay control circuit (3) and a Central Processing Unit (CPU); the main loop circuit (1) comprises a rectifying circuit (1a), a power-on buffer circuit (1b) and an IGBT (insulated gate bipolar transistor) inverter circuit (1c) which are sequentially connected, the power-on buffer circuit (1b) comprises a charging resistor R22 and a charging capacitor which are connected between two output ends of the rectifying circuit (1a) in series, and a charging relay RY1 is connected with the charging resistor R22 in parallel; the central processing unit CPU is respectively connected with the bus voltage detection circuit (2) and the relay control circuit (3), the bus voltage detection circuit (2) detects the terminal voltage U0 at two ends of the charging capacitor and inputs a direct current voltage signal VDC to the central processing unit CPU, and if the terminal voltage U0 is greater than or equal to the attraction threshold voltage and the direct current voltage signal VDC is not increased any more, the central processing unit CPU controls the attraction of the charging relay RY1 through the relay control circuit (3).
2. The suction control device of the frequency converter charging relay as claimed in claim 1, characterized in that: the bus voltage detection circuit (2) comprises a high-resistance isolation circuit (2a) and a differential circuit (2b), two input ends of the high-resistance isolation circuit (2a) are respectively connected with two ends of a charging capacitor, an output end of the high-resistance isolation circuit (2a) is connected with an input end of the differential circuit (2b), an output end of the differential circuit (2b) is connected with an I/O port of a central processing unit CPU, and a direct-current voltage signal VDC is input to the central processing unit CPU; the relay control circuit (3) comprises an optocoupler PC1 and a triode Q1, a central processing unit CPU is connected with the optocoupler PC1, the optocoupler PC1 is connected with a triode Q1, and the triode Q1 is connected with a coil of a charging relay RY 1;
the bus voltage detection circuit (2) acquires terminal voltages UO at two ends of a charging capacitor, a direct-current voltage signal VDC is input to a Central Processing Unit (CPU) through a high-resistance isolation circuit (2a) and a differential circuit (2b), if the terminal voltage U0 is larger than or equal to attraction threshold voltage and the direct-current voltage signal VDC is not increased, the Central Processing Unit (CPU) inputs a level signal REC to an optocoupler (PCI) to enable an optocoupler PC1 to be conducted, then a triode Q1 is conducted, a coil of a charging relay RY1 is electrified, and the charging relay RY1 is attracted; if the terminal voltage U0 is smaller than the pull-in threshold voltage and/or the direct current voltage signal VDC continuously increases, the central processing unit CPU enables the optocoupler PC1 to be kept non-conductive, the triode Q1 is not conductive, no current flows through a coil of the charging relay RY1, and the charging relay RY1 is kept disconnected.
3. The suction control device of the frequency converter charging relay as claimed in claim 1 or 2, characterized in that: the bus voltage detection circuit (2) comprises a high-resistance isolation circuit (2a), a differential circuit (2b), an input end P3 and an input end N, wherein the differential circuit (2b) comprises an operational amplifier U1A;
the high-resistance isolation circuit (2a) comprises a plurality of resistors connected in series between the input end P3 and the non-inverting input end of the budget amplifier U1A, and a plurality of resistors connected in series between the input end N and the inverting input end of the operational amplifier U1A;
a resistor R16 and a resistor R17 are connected in series between a positive phase input end of the operational amplifier U1A and the ground, a resistor R15 is connected in parallel at two ends of a resistor R16 and a resistor R17, a capacitor C2 is connected in parallel at two ends of a resistor R16 and a resistor R17, a resistor R18 is connected in series between an inverting input end of the operational amplifier U1A and the ground, an inverting input end of the operational amplifier U1A is connected with an output end of the operational amplifier U1A through a resistor R19 and a resistor R20 which are connected in series, a capacitor C1 is connected in parallel at two ends of a resistor R19 and a resistor R20, an output end of the operational amplifier U1A is connected with an I/O port of the CPU through a resistor R21, a node between the resistor R21 and the I/O port is grounded through a capacitor C6, a positive power supply end of the operational amplifier U1A is grounded through a capacitor C36.
4. The suction control device of the frequency converter charging relay as claimed in claim 1 or 2, characterized in that: a first pin of an optocoupler PC1 of the relay control circuit (3) is connected with a +5V power supply, a second pin of an optocoupler PC1 is connected with a central processing unit CPU through a resistor R23, a third pin of the optocoupler PC1 is connected with a base of a triode Q1 of the relay control circuit (3) through a resistor R24, a node between a third pin of an optocoupler PC1 and the base of the triode Q1 is grounded through a resistor R25, a fourth pin of the optocoupler PC1 is connected with a 24V power supply, an emitter of the triode Q1 is grounded, a collector of a triode Q1 is connected with an anode of a diode D2, a cathode of the diode D2 is connected with the 24V power supply, and a coil of a charging relay RY1 is connected between the collector of the triode Q1 and the 24V power supply.
5. The suction control device of the frequency converter charging relay as claimed in claim 1 or 2, characterized in that: the rectification circuit (1a) comprises a full-wave rectification bridge D1; the power-on buffer circuit (1b) comprises a resistor R22, a charging capacitor, a resistor R26 and a resistor R27, the charging capacitor comprises an electrolytic capacitor E1 and an electrolytic capacitor E2, the resistor R22, the electrolytic capacitor E1 and the electrolytic capacitor E2 are sequentially connected between the positive output end and the negative output end of the rectifying circuit (1a) in series, the resistor R26 is connected with the electrolytic capacitor E1 in parallel, and the capacitor R27 is connected with the electrolytic capacitor E2 in parallel.
6. The suction control device of the frequency converter charging relay as claimed in claim 1 or 2, characterized in that: the pull-in threshold voltage is 400V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920857844.6U CN210093113U (en) | 2019-06-04 | 2019-06-04 | Suction control device for charging relay of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920857844.6U CN210093113U (en) | 2019-06-04 | 2019-06-04 | Suction control device for charging relay of frequency converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110233578A (en) * | 2019-06-04 | 2019-09-13 | 浙江正泰电器股份有限公司 | Frequency converter charge relay is attracted control device and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233578A (en) * | 2019-06-04 | 2019-09-13 | 浙江正泰电器股份有限公司 | Frequency converter charge relay is attracted control device and control method |
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