CN209786780U - Three-phase voltage input protection equipment - Google Patents
Three-phase voltage input protection equipment Download PDFInfo
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- CN209786780U CN209786780U CN201920938117.2U CN201920938117U CN209786780U CN 209786780 U CN209786780 U CN 209786780U CN 201920938117 U CN201920938117 U CN 201920938117U CN 209786780 U CN209786780 U CN 209786780U
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Abstract
the utility model provides a three-phase voltage input protection equipment, include: the power supply circuit, the voltage comparison circuit, the three-phase power supply sampling circuit, the drive circuit and the relay circuit; the input end of the power supply circuit is connected with the L1 phase and the L2 phase of a three-phase power supply, the output end of the power supply circuit is connected with the input end of the voltage comparison circuit, and the positive power supply VCC provides direct-current working voltage for subsequent circuits; the input end of the three-phase power supply sampling circuit is respectively connected with three phases of a three-phase power supply, and the output ends of the voltage comparison circuit and the three-phase power supply sampling circuit are connected with the input end of the driving circuit; the output end of the driving circuit is connected with the input end of the relay circuit, and the output end of the relay circuit is respectively connected with three phases of a three-phase power supply. The utility model discloses simple structure, low cost, the reliability is high, can solve three phase current's voltage too high, undulant, lack looks scheduling problem, extension equipment life.
Description
Technical Field
The utility model belongs to the technical field of electrical equipment, especially, relate to a three-phase voltage input protection circuit.
Background
faults such as overhigh voltage, fluctuation or phase loss and the like often occur in a three-phase power supply line, so that equipment is damaged, and in addition, if 220V is connected to 380V by mistake during actual use, the equipment can also be damaged instantaneously. Most of three-phase power supply protection equipment on the market at present has complex structures and higher cost, and cannot be well applied.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a three-phase voltage input protection device with simple structure, low cost and high reliability, which is used to solve the problems of over-high voltage, fluctuation, phase loss, and the error of receiving 220V to 380V, and thus prolonging the service life of the device.
To achieve the above and other related objects, the present invention provides a three-phase voltage input protection device, including: the power supply circuit, the voltage comparison circuit, the three-phase power supply sampling circuit, the drive circuit and the relay circuit;
the input end of the power supply circuit is connected with the L1 phase and the L2 phase of a three-phase power supply, the output end of the power supply circuit is connected with the input end of the voltage comparison circuit, and the positive power supply VCC provides direct-current working voltage for subsequent circuits; the input end of the three-phase power supply sampling circuit is respectively connected with three phases of a three-phase power supply, and the output ends of the voltage comparison circuit and the three-phase power supply sampling circuit are connected with the input end of the driving circuit; the output end of the driving circuit is connected with the input end of the relay circuit, and the output end of the relay circuit is respectively connected with three phases of a three-phase power supply.
In an embodiment of the present invention, the power circuit includes a fuse F1, a fuse F2, a transformer T1, a rectifier bridge B1, a capacitor C1, a voltage stabilizing unit U1, a fast recovery rectifier tube D1, an inductor L1, and a capacitor C2;
Two alternating current input ends of a transformer T1 are connected with a fuse F1 and a fuse F2 in series and then connected with an L1 phase and an L2 phase of a three-phase power supply, an output end of the transformer T1 is connected with an alternating current input end of a rectifier bridge B1, an anode of an output end of the rectifier bridge B1 is connected with a first pin of a voltage stabilizing unit U1 and an anode of a capacitor C1, a cathode of an output end of the rectifier bridge B1, a cathode of a capacitor C1, a third pin and a fifth pin of the voltage stabilizing unit U1 are all grounded, a second pin of a voltage stabilizing unit U1 is connected with a cathode of a fast recovery rectifier tube D1 and one end of an inductor L1, the other end of the inductor L1 is connected with an anode of the capacitor C2 and a fourth pin of the voltage stabilizing unit U1, and a cathode of a capacitor C2 is grounded.
In an embodiment of the present invention, the voltage comparison circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D2, and a voltage comparator U2;
the resistor R1 is connected with the resistor R2 in series, the middle node after the series connection is connected with the inverting input end of the voltage comparator U2, the other end of the resistor R1 is connected with the anode of the output end of the rectifier bridge B1, and the other end of the resistor R2 is grounded; the resistor R3 is connected in series with the resistor R4, the middle node after series connection is connected with the non-inverting input end of the voltage comparator U2, the other end of the resistor R3 is connected with a power supply VCC, the other end of the resistor R4 is grounded, the output end of the voltage comparator U2 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected with the input end of the driving circuit.
In an embodiment of the present invention, the three-phase power sampling circuit includes a plurality of resistors, a diode D3, a diode D4, a diode D5, and a voltage comparator U3;
the resistor R5, the resistor R6 and the resistor R7 are connected in series, the resistor R14 and the resistor R15 are connected in series, the other end of the resistor R5 is connected with the L3 of the three-phase power supply, and the middle node of the resistor R14 and the resistor R15 is connected with the other end of the resistor R7; the resistor R8, the resistor R9 and the resistor R10 are connected in series, the resistor R16 and the resistor R17 are connected in series, the other end of the resistor R8 is connected with the L2 of the three-phase power supply, and the middle node of the resistor R16 and the resistor R17 is connected with the other end of the resistor R10; the resistor R11, the resistor R12 and the resistor R13 are connected in series, the resistor R18 and the resistor R19 are connected in series, the other end of the resistor R11 is connected with the L1 of the three-phase power supply, and the middle node of the resistor R18 and the resistor R19 is connected with the other end of the resistor R13; the other ends of the resistor R14, the resistor R16 and the resistor R18 are connected together, one end of the diode D3 and the diode D4 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18 after being connected in parallel in an opposite direction, and the other end of the diode D3 and the common end of the resistor R3583 and the resistor R18 are grounded; the resistor R20 and the resistor R23 are connected in series, the middle node of the resistor R20 and the resistor R23 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18, the other end of the resistor R20 is connected with the non-inverting input end of the voltage comparator U3, and the other end of the resistor R23 is grounded; the other ends of the resistor R15, the resistor R17 and the resistor R19 are connected together, the resistor R21 and the resistor R22 are connected in series, a middle node of the resistor R21 and the resistor R22 is connected with a common end of the resistor R15, the resistor R17 and the resistor R19, the other end of the resistor R21 is connected with an inverted input end of the voltage comparator U3, and the other end of the resistor R22 is grounded; the output end of the voltage comparator U3 is connected with the cathode of the diode D5, and the anode of the diode D5 is connected with the input end of the driving circuit.
In an embodiment of the present invention, the driving circuit includes a resistor R24, a diode D6, a diode D7, a resistor R25, a resistor R26, a capacitor C3, and a transistor Q1;
One end of the resistor R24 is connected with a power supply VCC, the other end of the resistor R24 is connected with the anodes of the diode D2, the diode D5 and the diode D6, the cathode of the diode D6 is connected with the anode of the diode D7, the cathode of the diode D7 is connected with one end of the resistor R25, the resistor R26 is connected with the capacitor C3 in parallel, one end of the resistor D6 is connected with the base of the triode Q1 and the other end of the resistor R25 in parallel, the other end of the resistor D7 is grounded, the collector of the triode Q1 is connected with the relay K2, and the emitter of.
in an embodiment of the present invention, the relay circuit includes a relay K1, a relay K2, and a diode D8;
the diode D8 is reversely connected in parallel at two ends of the coil interface of the relay K2, the anode of the coil interface of the relay K2 is connected with a power supply VCC, and the cathode is connected with the collector of the triode Q1; one group of contact interfaces of the relay K2 are connected in series between one end of a coil interface of the relay K1 and the L3 phase of the three-phase power supply; the other end of the coil interface of the relay K1 is connected with a three-phase power supply L1, and three groups of contact interfaces of the relay K1 are respectively connected with three phases of the three-phase power supply.
as described above, the utility model discloses a three-phase voltage input protection equipment has following beneficial effect: the utility model discloses too high, undulant or lack the looks to protect the voltage in the circuit, simple structure, it is with low costs, the reliability is high.
The utility model discloses three-phase voltage input protection equipment initial condition is the disconnection, inserts three phase current after, if three phase current is normal, voltage comparator U2 and voltage comparator U3 output high level to drive circuit, and drive circuit makes the relay circuit get electric, and the relay is closed, and equipment normally works.
If the voltage of 220V is connected to 380V by mistake or overvoltage, fluctuation or phase failure occurs in the three-phase power supply voltage, the voltage comparator U2 or the voltage comparator U3 outputs low level to the driving circuit, and the driving circuit enables the relay circuit to lose power and keeps the off state.
The utility model discloses a transformer T1's elementary and relay K1's control end connects three phase current's L1 looks, L2 looks, L3 looks respectively, when arbitrary looks lose the electricity, can cause transformer T1 and relay K1 one of them or lose the electricity simultaneously, leads to this protective apparatus unable closed relay K1 under the default phase state, realizes the default phase protection.
Drawings
Fig. 1 shows a block diagram of the three-phase voltage input protection device of the present invention.
fig. 2 shows a circuit diagram of the three-phase voltage input protection device of the present invention.
Description of the element reference numerals
1 a power supply circuit; 2. a voltage comparison circuit; 3. a three-phase power supply sampling circuit; 4. a drive circuit; 5. a relay circuit.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
referring to fig. 1, the present invention provides a three-phase voltage input protection device with convenient use and capable of providing overvoltage protection, open-phase protection and voltage fluctuation protection. The method comprises the following steps: the device comprises a power supply circuit 1, a voltage comparison circuit 2, a three-phase power supply sampling circuit 3, a drive circuit 4 and a relay circuit 5; the input end of the power supply circuit 1 is connected with the L1 phase and the L2 phase of a three-phase power supply, the output end of the power supply circuit 1 is connected with the input end of the voltage comparison circuit 2, and a positive power supply VCC provides direct-current working voltage for subsequent circuits; the input end of the three-phase power supply sampling circuit 3 is respectively connected with three phases of a three-phase power supply, and the output ends of the voltage comparison circuit 2 and the three-phase power supply sampling circuit 3 are connected with the input end of a driving circuit 4; the output end of the driving circuit 4 is connected with the input end of the relay circuit 5, and the output end of the relay circuit 5 is respectively connected with three phases of a three-phase power supply.
The utility model discloses three-phase voltage input protection equipment initial condition is the disconnection, after the access three-phase power, if three-phase mains voltage is normal, voltage comparator U2, U3 export high level to drive circuit 4, and drive circuit makes relay circuit 5 electrified, and the relay is closed, and equipment normally works; if the 220V is connected to 380V by mistake or the three-phase power supply voltage has overvoltage, fluctuation or phase failure, the voltage comparator U2 or the voltage comparator U3 outputs low level to the driving circuit 4, the driving circuit 4 enables the relay circuit 5 to lose power, and the relay keeps an off state.
Referring to fig. 2, the power circuit 1 includes a fuse F1, a fuse F2, a transformer T1, a rectifier bridge B1, a capacitor C1, a voltage stabilizing unit U1, a fast recovery rectifier D1, an inductor L1, and a capacitor C2;
The voltage regulation unit U1 in this embodiment adopts a voltage regulation chip LM 2575. Two alternating current input ends of a transformer T1 are connected with a fuse F1 and a fuse F2 in series and then connected with an L1 phase and an L2 phase of a three-phase power supply, an output end of the transformer T1 is connected with an alternating current input end of a rectifier bridge B1, an anode of an output end of the rectifier bridge B1 is connected with a first pin of a voltage stabilizing unit U1 and an anode of a capacitor C1, a cathode of an output end of the rectifier bridge B1, a cathode of a capacitor C1, a third pin and a fifth pin of the voltage stabilizing unit U1 are all grounded, a second pin of a voltage stabilizing unit U1 is connected with a cathode of a fast recovery rectifier tube D1 and one end of an inductor L1, the other end of the inductor L1 is connected with an anode of the capacitor C2 and a fourth pin of the voltage stabilizing unit U1, and a cathode of a capacitor C2 is grounded.
The power circuit 1 adopts L1 phase and L2 phase of three-phase power, and the fuses F1 and F2 provide protection for the circuit. The input alternating current is subjected to voltage reduction by a transformer T1, rectification by a rectifier bridge B1 and filtering by a capacitor C1 and then converted into direct current to provide working voltage for a voltage stabilizing unit U1, and a power supply VCC output by the voltage stabilizing unit U1 is subjected to voltage stabilization and filtering to provide working voltage for subsequent circuits.
Referring to fig. 2, the voltage comparison circuit 2 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D2, and a voltage comparator U2;
the resistor R1 is connected with the resistor R2 in series, the middle node after the series connection is connected with the inverting input end of the voltage comparator U2, the other end of the resistor R1 is connected with the anode of the output end of the rectifier bridge B1, and the other end of the resistor R2 is grounded; the resistor R3 is connected in series with the resistor R4, the middle node after series connection is connected with the non-inverting input end of the voltage comparator U2, the other end of the resistor R3 is connected with a power supply VCC, the other end of the resistor R4 is grounded, the output end of the voltage comparator U2 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected with the input end of the driving circuit.
The power supply VCC is divided by resistors R3 and R4, and then input to the non-inverting input terminal of the voltage comparator U2 as a reference voltage. The direct current power supply output by the rectifier bridge B1 is divided by resistors R1 and R2 and then input into the inverting input end of the voltage comparator U2.
Referring to fig. 2, the three-phase power sampling circuit 3 includes a plurality of resistors, a diode D3, a diode D4, a diode D5, and a voltage comparator U3;
The resistor R5, the resistor R6 and the resistor R7 are connected in series, the resistor R14 and the resistor R15 are connected in series, the other end of the resistor R5 is connected with the L3 of the three-phase power supply, and the middle node of the resistor R14 and the resistor R15 is connected with the other end of the resistor R7; the resistor R8, the resistor R9 and the resistor R10 are connected in series, the resistor R16 and the resistor R17 are connected in series, the other end of the resistor R8 is connected with the L2 of the three-phase power supply, and the middle node of the resistor R16 and the resistor R17 is connected with the other end of the resistor R10; the resistor R11, the resistor R12 and the resistor R13 are connected in series, the resistor R18 and the resistor R19 are connected in series, the other end of the resistor R11 is connected with the L1 of the three-phase power supply, and the middle node of the resistor R18 and the resistor R19 is connected with the other end of the resistor R13; the other ends of the resistor R14, the resistor R16 and the resistor R18 are connected together, one end of the diode D3 and the diode D4 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18 after being connected in parallel in an opposite direction, and the other end of the diode D3 and the common end of the resistor R3583 and the resistor R18 are grounded; the resistor R20 and the resistor R23 are connected in series, the middle node of the resistor R20 and the resistor R23 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18, the other end of the resistor R20 is connected with the non-inverting input end of the voltage comparator U3, and the other end of the resistor R23 is grounded; the other ends of the resistor R15, the resistor R17 and the resistor R19 are connected together, the resistor R21 and the resistor R22 are connected in series, a middle node of the resistor R21 and the resistor R22 is connected with a common end of the resistor R15, the resistor R17 and the resistor R19, the other end of the resistor R21 is connected with an inverted input end of the voltage comparator U3, and the other end of the resistor R22 is grounded; the output end of the voltage comparator U3 is connected with the cathode of the diode D5, and the anode of the diode D5 is connected with the input end of the driving circuit.
Resistors R5, R6, R7, R8, R9, R10, R11, R12 and R13 are voltage-reducing current-limiting resistors, two groups of return-to-zero circuits are formed by the resistors R14, R16 and R18 and the resistors R15, R17 and R19, and the resistors R20, R21, R22 and R23 are input into a voltage comparator U3 after return-to-zero signals are stabilized.
To save space, voltage comparator integrated chip LM393 can be used to implement the functions of voltage comparators U2 and U3.
Referring to fig. 2, the driving circuit 4 includes a resistor R24, a diode D6, a diode D7, a resistor R25, a resistor R26, a capacitor C3, and a transistor Q1;
One end of the resistor R24 is connected with a power supply VCC, the other end of the resistor R24 is connected with the anodes of the diode D2, the diode D5 and the diode D6, the cathode of the diode D6 is connected with the anode of the diode D7, the cathode of the diode D7 is connected with one end of the resistor R25, the resistor R26 is connected with the capacitor C3 in parallel, one end of the resistor D6 is connected with the base of the triode Q1 and the other end of the resistor R25 in parallel, the other end of the resistor D7 is grounded, the collector of the triode Q1 is connected with the relay K2, and the emitter of.
The resistor R24 is a pull-up resistor at the output ends of the voltage comparator U2 and the U3, the power VCC is limited by the resistor R25, and then is reduced by the diodes D6 and D7, and provides working voltage for the base of the triode Q1.
referring to fig. 2, the relay circuit 5 includes a relay K1, a relay K2, and a diode D8;
The diode D8 is reversely connected in parallel at two ends of the coil interface of the relay K2, and the relay K2 is protected from being burnt out. The positive electrode of the coil interface of the relay K2 is connected with a power supply VCC, and the negative electrode of the coil interface of the relay K2 is connected with the collector of the triode Q1; one group of contact interfaces of the relay K2 are connected in series between one end of a coil interface of the relay K1 and the L3 phase of the three-phase power supply; the other end of the coil interface of the relay K1 is connected with a three-phase power supply L1, and three groups of contact interfaces of the relay K1 are respectively connected with three phases of the three-phase power supply.
for the protective equipment, the utility model discloses three-phase voltage input protective equipment initial condition is the disconnection. After a three-phase power supply is switched on, if the input voltage of the three-phase power supply is in a normal range, the inverted input voltage value of the voltage comparator U2 is smaller than the reference voltage value, a high level is output, and the diode D2 is cut off; if the phase of the three-phase power supply is normal, the input end of the voltage comparator U3 is zero, the output end is in a high-impedance state, and the diode D5 is cut off; at the moment, a power supply VCC is subjected to current limiting through a resistor R25, a diode D6 and a diode D7 are subjected to voltage reduction, voltage is provided for a base electrode of a triode Q1, the Q1 is conducted, a coil of a relay K2 is electrified and then attracted, the coil of the relay K1 is electrified after the attraction of a relay K2, the relay K1 is attracted, a three-phase power supply circuit is connected, and the equipment works normally.
If a customer mistakenly connects 220V to 380V or the input voltage has overvoltage or fluctuation faults, the output end of the voltage comparator chip U2 is at a low level, and the diode D2 is conducted; when the input voltage has a phase loss, the output end of the voltage comparator chip U3 is at a low level, and the diode D5 is conducted; any one of the diodes D2 or D5 is switched on, the voltage value of the power supply VCC is pulled down, the triode Q1 is cut off, the coil of the relay K2 is disconnected after power failure, the coil of the relay K1 is disconnected after the K2 is disconnected after power failure, a circuit is cut off, and the protection equipment cannot be damaged due to voltage failure.
The primary side of the transformer T1 and the control end of the relay K1 are respectively connected with three phases of a three-phase power supply, when any one phase loses power, one or both of the transformer T1 and the relay K1 lose power, so that the relay K1 cannot be closed under the phase-loss state of the protection equipment, and secondary phase-loss protection is realized.
To sum up, the utility model discloses three-phase voltage input protection equipment initial condition is the disconnection, inserts three-phase power after, if three-phase mains voltage is normal, voltage comparator U2, voltage comparator U3's output high level to drive circuit, and drive circuit makes the relay circuit electrified, and the relay is closed, and equipment normal work; if the voltage of 220V is connected to 380V by mistake or the three-phase power supply voltage has overvoltage, fluctuation or phase failure, the output ends of the voltage comparator U2 and the voltage comparator U3 output low level to the driving circuit, the driving circuit enables the relay circuit to lose power, and the relay keeps an off state. The utility model discloses too high, undulant or lack the looks to protect the voltage in the circuit, simple structure, it is with low costs, the reliability is high.
Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A three-phase voltage input protection device, comprising: the power supply circuit, the voltage comparison circuit, the three-phase power supply sampling circuit, the drive circuit and the relay circuit;
The input end of the power supply circuit is connected with the L1 phase and the L2 phase of a three-phase power supply, the output end of the power supply circuit is connected with the input end of the voltage comparison circuit, and the positive power supply VCC provides direct-current working voltage for subsequent circuits; the input end of the three-phase power supply sampling circuit is respectively connected with three phases of a three-phase power supply, and the output ends of the voltage comparison circuit and the three-phase power supply sampling circuit are connected with the input end of the driving circuit; the output end of the driving circuit is connected with the input end of the relay circuit, and the output end of the relay circuit is respectively connected with three phases of a three-phase power supply.
2. A three-phase voltage input protection device according to claim 1, characterized in that: the power supply circuit comprises a fuse F1, a fuse F2, a transformer T1, a rectifier bridge B1, a capacitor C1, a voltage stabilizing unit U1, a fast recovery rectifier tube D1, an inductor L1 and a capacitor C2;
Two alternating current input ends of a transformer T1 are connected with a fuse F1 and a fuse F2 in series and then connected with an L1 phase and an L2 phase of a three-phase power supply, an output end of the transformer T1 is connected with an alternating current input end of a rectifier bridge B1, an anode of an output end of the rectifier bridge B1 is connected with a first pin of a voltage stabilizing unit U1 and an anode of a capacitor C1, a cathode of an output end of the rectifier bridge B1, a cathode of a capacitor C1, a third pin and a fifth pin of the voltage stabilizing unit U1 are all grounded, a second pin of a voltage stabilizing unit U1 is connected with a cathode of a fast recovery rectifier tube D1 and one end of an inductor L1, the other end of the inductor L1 is connected with an anode of the capacitor C2 and a fourth pin of the voltage stabilizing unit U1, and a cathode of a capacitor C2 is grounded.
3. A three-phase voltage input protection device according to claim 1, characterized in that: the voltage comparison circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D2 and a voltage comparator U2;
The resistor R1 is connected with the resistor R2 in series, the middle node after the series connection is connected with the inverting input end of the voltage comparator U2, the other end of the resistor R1 is connected with the anode of the output end of the rectifier bridge B1, and the other end of the resistor R2 is grounded; the resistor R3 is connected in series with the resistor R4, the middle node after series connection is connected with the non-inverting input end of the voltage comparator U2, the other end of the resistor R3 is connected with a power supply VCC, the other end of the resistor R4 is grounded, the output end of the voltage comparator U2 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected with the input end of the driving circuit.
4. a three-phase voltage input protection device according to claim 1, characterized in that: the three-phase power supply sampling circuit comprises a plurality of resistors, a diode D3, a diode D4, a diode D5 and a voltage comparator U3;
The resistor R5, the resistor R6 and the resistor R7 are connected in series, the resistor R14 and the resistor R15 are connected in series, the other end of the resistor R5 is connected with the L3 of the three-phase power supply, and the middle node of the resistor R14 and the resistor R15 is connected with the other end of the resistor R7; the resistor R8, the resistor R9 and the resistor R10 are connected in series, the resistor R16 and the resistor R17 are connected in series, the other end of the resistor R8 is connected with the L2 of the three-phase power supply, and the middle node of the resistor R16 and the resistor R17 is connected with the other end of the resistor R10; the resistor R11, the resistor R12 and the resistor R13 are connected in series, the resistor R18 and the resistor R19 are connected in series, the other end of the resistor R11 is connected with the L1 of the three-phase power supply, and the middle node of the resistor R18 and the resistor R19 is connected with the other end of the resistor R13; the other ends of the resistor R14, the resistor R16 and the resistor R18 are connected together, one end of the diode D3 and the diode D4 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18 after being connected in parallel in an opposite direction, and the other end of the diode D3 and the common end of the resistor R3583 and the resistor R18 are grounded; the resistor R20 and the resistor R23 are connected in series, the middle node of the resistor R20 and the resistor R23 is connected with the common end of the resistor R14, the resistor R16 and the resistor R18, the other end of the resistor R20 is connected with the non-inverting input end of the voltage comparator U3, and the other end of the resistor R23 is grounded; the other ends of the resistor R15, the resistor R17 and the resistor R19 are connected together, the resistor R21 and the resistor R22 are connected in series, a middle node of the resistor R21 and the resistor R22 is connected with a common end of the resistor R15, the resistor R17 and the resistor R19, the other end of the resistor R21 is connected with an inverted input end of the voltage comparator U3, and the other end of the resistor R22 is grounded; the output end of the voltage comparator U3 is connected with the cathode of the diode D5, and the anode of the diode D5 is connected with the input end of the driving circuit.
5. A three-phase voltage input protection device according to claim 1, characterized in that: the driving circuit comprises a resistor R24, a diode D6, a diode D7, a resistor R25, a resistor R26, a capacitor C3 and a triode Q1;
one end of the resistor R24 is connected with a power supply VCC, the other end of the resistor R24 is connected with the anodes of the diode D2, the diode D5 and the diode D6, the cathode of the diode D6 is connected with the anode of the diode D7, the cathode of the diode D7 is connected with one end of the resistor R25, the resistor R26 is connected with the capacitor C3 in parallel, one end of the resistor D6 is connected with the base of the triode Q1 and the other end of the resistor R25 in parallel, the other end of the resistor D7 is grounded, the collector of the triode Q1 is connected with the relay K2, and the emitter of.
6. A three-phase voltage input protection device according to claim 1, characterized in that: the relay circuit comprises a relay K1, a relay K2 and a diode D8;
The diode D8 is reversely connected in parallel at two ends of the coil interface of the relay K2, the anode of the coil interface of the relay K2 is connected with a power supply VCC, and the cathode is connected with the collector of the triode Q1; one group of contact interfaces of the relay K2 are connected in series between one end of a coil interface of the relay K1 and the L3 phase of the three-phase power supply; the other end of the coil interface of the relay K1 is connected with a three-phase power supply L1, and three groups of contact interfaces of the relay K1 are respectively connected with three phases of the three-phase power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938117.2U CN209786780U (en) | 2019-06-20 | 2019-06-20 | Three-phase voltage input protection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938117.2U CN209786780U (en) | 2019-06-20 | 2019-06-20 | Three-phase voltage input protection equipment |
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| CN209786780U true CN209786780U (en) | 2019-12-13 |
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| CN201920938117.2U Active CN209786780U (en) | 2019-06-20 | 2019-06-20 | Three-phase voltage input protection equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276358A (en) * | 2020-02-28 | 2020-06-12 | 许海青 | Automatic control device of power isolating switch |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276358A (en) * | 2020-02-28 | 2020-06-12 | 许海青 | Automatic control device of power isolating switch |
| CN111276358B (en) * | 2020-02-28 | 2021-11-02 | 许海青 | Automatic control device of power isolating switch |
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