CN216564515U - Three-phase rectifier bridge control circuit of automatic change-over switch - Google Patents
Three-phase rectifier bridge control circuit of automatic change-over switch Download PDFInfo
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- CN216564515U CN216564515U CN202122411989.3U CN202122411989U CN216564515U CN 216564515 U CN216564515 U CN 216564515U CN 202122411989 U CN202122411989 U CN 202122411989U CN 216564515 U CN216564515 U CN 216564515U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a three-phase rectifier bridge control circuit of an automatic change-over switch, and belongs to the technical field of circuit design. The control circuit comprises a control unit, a power selection breaking protection unit, an electromagnetic drive unit and an RCD energy absorption protection unit, wherein the control unit comprises a sampling loop of a main power supply 380Vav and a sampling loop of a standby power supply 380 Vav; the electromagnetic driving unit comprises a three-phase rectifier bridge, the input side comprises 3 pins Pin1, Pin2 and Pin3, and the output side comprises 2 pins "+" and "-"; the RCD energy-absorbing protection unit comprises a diode D1, a resistor R4, a capacitor C and an electromagnet coil L; the cathode of the diode D1 is connected with the + pole of the three-phase rectifier bridge, and the anode of the diode D1 is connected with the-pole of the three-phase rectifier bridge through a resistor R4; the capacitor C is connected in parallel across the resistor R4. The utility model improves the driving capability of the electromagnetic coil and reduces the reverse overvoltage of the rectifier bridge diode.
Description
Technical Field
The utility model relates to the technical field of circuit design, in particular to a three-phase rectifier bridge control circuit of an automatic change-over switch.
Background
At present, as the automatic transfer switch is more and more widely applied in the key power distribution field, the demand for the excitation type transfer switch with large capacity and rapid breaking capacity is more and more, and the demand for the control capacity of the excitation coil with large attraction in the Automatic Transfer Switch (ATSE) is gradually increased. The common scheme of the excitation mode is that the on-off of the current of the excitation coil is realized by controlling the mechanical contact of the relay to realize the conversion of the contact of the automatic transfer switch, after the conversion of the Automatic Transfer Switch (ATSE) is completed, the excitation energy in the excitation coil is released in an arc mode when the contact of the relay is disconnected, the larger the current is, the higher the requirement on the disconnection capability of the contact is, after the relay is subjected to multiple discharges, the contact of the relay is melted, and the disconnection capability and the service life of the relay are reduced. The single-phase bridge type rectification driving circuit adopted by the existing automatic change-over switch has the problems that the output of the rectified voltage after the bridge is not stable enough, the attenuation is fast, and the high-power electromagnetic coil is difficult to drive.
In order to avoid the above problems, it is necessary to ensure a certain ampere-turns number by a technique while maintaining the existing tension, so as to reduce the on-off current of the coil as much as possible while improving the resistance of the coil. The full-bridge rectification driving circuit solves the problem of stability of output of rectified voltage after a bridge, the output line voltage does not contain low-order harmonic waves, the utilization rate of direct current voltage is improved as far as possible, and the high-power electromagnetic coil can be driven on the premise that the current is not increased. Therefore, a drive breaking circuit which controls the conventional excitation coil drive circuit to have high-efficiency output capability and also has long service life is a solution of great interest.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a three-phase rectifier bridge control circuit of an automatic change-over switch. The circuit adopts a three-phase rectifier bridge to improve the driving capability of the electromagnetic coil, and the RCD energy absorption protection circuit realizes the absorption of excitation energy and reduces the reverse overvoltage of a rectifier bridge diode.
In order to solve the problems, the technical scheme adopted by the utility model is as follows: a three-phase rectifier bridge control circuit of an automatic transfer switch comprises a control unit, a power selection breaking protection unit, an electromagnetic drive unit and an RCD energy absorption protection unit;
the electromagnetic driving unit comprises a three-phase rectifier bridge, wherein the input side comprises 3 pins Pin1, Pin2 and Pin3, and the output side comprises 2 pins "+" and "-"; the three-phase rectifier bridge driving circuit improves equivalent switching frequency, reduces switching loss and harmonic components related to carrier waves, thereby improving the utilization rate of direct-current voltage, generating more useful work and providing the driving force of the electromagnet under the condition that the number of turns of the magnet exciting coil of the electromagnet is not changed.
The RCD energy-absorbing protection unit comprises a diode D1, a resistor R4, a capacitor C and an electromagnet coil L; the cathode of the diode D1 is connected with the + pole of the three-phase rectifier bridge, and the anode of the diode D1 is connected with the-pole of the three-phase rectifier bridge through a resistor R4; the capacitor C is connected in parallel with two ends of the resistor R4; the circuit is used for absorbing energy in the magnet exciting coil of the electromagnet after power failure, can consume current in the magnet exciting coil, and reduces the problem of internal overvoltage caused by no sudden change of inductive current in the instantaneous interruption process of the magnet exciting coil.
Further, the control unit comprises a sampling loop of a main power supply 380Vav and a sampling loop of a standby power supply 380 Vav; the control unit outputs switching logic by collecting and analyzing the electrical parameters of the main power supply and the standby power supply, and the control unit outputs signals to control the electricity selection relay and the breaking relay.
Further, the power selection breaking protection unit comprises a power selection relay KA1, a power selection relay KA2, a power selection relay KA3, a power selection relay KA4, a power selection relay KA5, a power selection relay KA6, a breaking contactor KM1, a fuse FU1, a fuse FU1, a fuse FU3, a piezoresistor R1, a piezoresistor R1 and a piezoresistor R3;
one end of the contacts of the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a main power supply, and the other end of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one end of the contacts of the power selection relay KA4, the power selection relay KA5 and the power selection relay KA6 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a standby power supply, and the other end of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one ends of three main loop contacts of the breaking contactor KM1 are connected with contacts of power selection relays KA 1-KA 6 (namely power selection relays KA1, KA2, KA3, KA4, KA5 and KA6), and the other ends of the three main loop contacts are connected with input sides of fuses FU1, FU2 and FU 3; the control unit controls the power-on and power-off of coils of the power selection relays KA 1-KA 6 through collecting and analyzing electric parameters of the main power supply and the standby power supply and outputting a switching command, so that the main power supply and the standby power supply of the automatic change-over switch are selected; the control unit realizes the on-off of the power supply of the driving circuit by breaking the power-on and power-off of the contactor coil KM 1;
the output side of the fuse FU1 is connected with a Pin1 Pin of a three-phase rectifier bridge, the output side of the fuse FU2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the output side of the fuse FU3 is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the piezoresistor R1 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end of the piezoresistor R1 is connected with a Pin2 Pin of the three-phase rectifier bridge; one end of the piezoresistor R2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the other end of the piezoresistor R2 is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the piezoresistor R3 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end is connected with a Pin3 Pin of the three-phase rectifier bridge. Fuse FU1, fuse FU2, fuse FU3 have three-phase short circuit protection effect, and piezo-resistor R1, piezo-resistor R2, piezo-resistor R3 are mainly used for carrying out voltage clamping when the circuit bears excessive voltage to this absorbs unnecessary energy and is used for protecting the drive circuit of back.
Further, the electromagnet coil L is an excitation coil.
Further, the resistor R4 is a power resistor.
Compared with the prior art, the three-phase rectifier bridge control circuit of the automatic transfer switch has the following advantages: the utility model has simple structure, improves the electric arc breaking capacity by selecting electricity for the intermediate relay coil and breaking the driving current by adopting the contactor, improves the driving capacity of the electromagnetic coil by using the three-phase rectifier bridge, realizes the absorption of excitation energy by the RCD energy absorption protection circuit, and reduces the reverse overvoltage of the rectifier bridge diode.
Drawings
Fig. 1 is a circuit diagram of a three-phase rectifier bridge control circuit of an automatic transfer switch provided by the utility model.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
A three-phase rectifier bridge control circuit of an automatic transfer switch comprises a control unit, a power selection breaking protection unit, an electromagnetic drive unit and an RCD energy absorption protection unit.
The control unit comprises a sampling loop of a main power supply 380Vav and a sampling loop of a standby power supply 380 Vav; the control unit outputs switching logic by collecting and analyzing the electrical parameters of the main power supply and the standby power supply, and outputs signals to control the electricity selection relay and the breaking relay.
The power selection and disconnection protection unit comprises a power selection relay KA1, a power selection relay KA2, a power selection relay KA3, a power selection relay KA4, a power selection relay KA5, a power selection relay KA6, a disconnection contactor KM1, a fuse FU1, a fuse FU1, a fuse FU3, a piezoresistor R1, a piezoresistor R1 and a piezoresistor R3;
one end of each of the contacts of the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a main power supply, and the other end of each of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one end of the contacts of the electricity selecting relay KA4, the electricity selecting relay KA5 and the electricity selecting relay KA6 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a standby power supply, and the other end of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one ends of three main loop contacts of the breaking contactor KM1 are connected with contacts of power selection relays KA 1-KA 6, and the other ends of the three main loop contacts are connected with input sides of a fuse FU1, a fuse FU2 and a fuse FU 3;
the output side of the fuse FU1 is connected with a Pin1 Pin of the three-phase rectifier bridge, the output side of the fuse FU2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the output side of the fuse FU3 is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the piezoresistor R1 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end is connected with a Pin2 Pin of the three-phase rectifier bridge; one end of the piezoresistor R2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the other end is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the voltage dependent resistor R3 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end is connected with a Pin3 Pin of the three-phase rectifier bridge.
The electromagnetic driving unit comprises a three-phase rectifier bridge, the input side comprises 3 pins Pin1, Pin2 and Pin3, and the output side comprises 2 pins "+" and "-".
The RCD energy-absorbing protection unit comprises a diode D1, a resistor R4, a capacitor C and an electromagnet coil L; the cathode of the diode D1 is connected with the + pole of the three-phase rectifier bridge, and the anode of the diode D1 is connected with the-pole of the three-phase rectifier bridge through a resistor R4; the capacitor C is connected in parallel across the resistor R4.
The electromagnet coil L is an excitation coil, and the resistor R4 is a power resistor.
The working principle of the utility model comprises the following steps:
step A: when the automatic change-over switch is in an original double-division position, the main power supply and the standby power supply are powered on at the same time, the control unit judges that the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 are pulled in, then the breaking contactor KM1 is switched on, the power supply drives the three-phase rectifier bridge through the fuse FU1, the fuse FU2, the fuse FU3, the piezoresistor R1, the piezoresistor R2 and the piezoresistor R3, the Pin1 Pin, the Pin2 Pin and the Pin3 Pin of the three-phase rectifier bridge are powered on at the same time, and the plus and minus of the three-phase rectifier bridge output direct-current pulsating voltage to electrify the excitation coil L. The control unit enables the breaking contactor KM1 to be powered off through preset time, the magnet exciting coil L forms a loop through a diode D1 and a capacitor C, energy of the magnet exciting coil L is converted into electric energy in a current mode to be stored in the capacitor C, the capacitor C and a power resistor R4 form a loop, and the electric energy stored in the capacitor C is converted into heat energy in a current mode through a power resistor R4 to be consumed. And the control unit cuts off the coils of the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 through preset time, and the conversion process is finished.
And B: when the main power supply is power-off and the standby power supply is power-on, the control unit judges that the power selection relay KA4, the power selection relay KA5 and the power selection relay KA6 are attracted, then the breaking contactor KM1 is switched on, the power supply drives a three-phase rectifier bridge through a fuse FU1, a fuse FU2, a fuse FU3, a piezoresistor R1, a piezoresistor R2 and a piezoresistor R3, pins Pin1, Pin2 and Pin3 of the three-phase rectifier bridge are simultaneously powered on, and the plus and minus of the three-phase rectifier bridge output direct-current pulsating voltage to electrify the excitation coil L. The control unit enables the breaking contactor KM1 to be powered off through preset time, the magnet exciting coil L forms a loop through a diode D1 and a capacitor C, energy of the magnet exciting coil L is converted into electric energy in a current mode to be stored in the capacitor C, the capacitor C and a power resistor R4 form a loop, and the electric energy stored in the capacitor C is converted into heat energy in a current mode through a power resistor R4 to be consumed. And the control unit cuts off the power of the coils of the KA4, the KA5 and the KA6 of the power selection relay through the preset time, and the conversion process is finished.
And C: when the main power supply is powered on again, the control unit executes the conversion command according to the preset control logic. The power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 are attracted, then the breaking contactor KM1 is switched on, a power supply drives a three-phase rectifier bridge through a fuse FU1, a fuse FU2, a fuse FU3, a piezoresistor R1, a piezoresistor R2 and a piezoresistor R3, pins Pin1, pins Pin2 and pins Pin3 of the three-phase rectifier bridge are electrified simultaneously, and the plus and minus of the three-phase rectifier bridge output direct current pulsating voltage to electrify the excitation coil L. The control unit enables the breaking contactor KM1 to be powered off through preset time, the magnet exciting coil L forms a loop through a diode D1 and a capacitor C, energy of the magnet exciting coil L is converted into electric energy in a current mode to be stored in the capacitor C, the capacitor C and a power resistor R4 form a loop, and the electric energy stored in the capacitor C is converted into heat energy in a current mode through a power resistor R4 to be consumed. And the control unit cuts off the coils of the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 through preset time, and the conversion process is finished.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or substitute part of the technical features thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the scope of the present invention.
Claims (3)
1. A three-phase rectifier bridge control circuit of an automatic transfer switch is characterized by comprising a control unit, a power selection breaking protection unit, an electromagnetic drive unit and an RCD energy absorption protection unit;
the electromagnetic driving unit comprises a three-phase rectifier bridge, the input side of the three-phase rectifier bridge comprises 3 pins Pin1, Pin2 and Pin3, and the output side of the three-phase rectifier bridge comprises 2 pins '+' and '-';
the RCD energy absorption protection unit comprises a diode D1, a resistor R4, a capacitor C and an electromagnet coil L; the cathode of the diode D1 is connected with the + pole of the three-phase rectifier bridge, and the anode of the diode D1 is connected with the-pole of the three-phase rectifier bridge through a resistor R4; the capacitor C is connected in parallel with two ends of the resistor R4;
the control unit comprises a sampling loop of a main power supply 380Vav and a sampling loop of a standby power supply 380 Vav;
the power selection breaking protection unit comprises a power selection relay KA1, a power selection relay KA2, a power selection relay KA3, a power selection relay KA4, a power selection relay KA5, a power selection relay KA6, a breaking contactor KM1, a fuse FU1, a fuse FU1, a fuse FU3, a piezoresistor R1, a piezoresistor R1 and a piezoresistor R3;
one end of the contacts of the power selection relay KA1, the power selection relay KA2 and the power selection relay KA3 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a main power supply, and the other end of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one end of the contacts of the power selection relay KA4, the power selection relay KA5 and the power selection relay KA6 is sequentially connected with a live wire L1, a live wire L2 and a live wire L3 of a standby power supply, and the other end of the contacts is connected with three main loop contacts of a breaking contactor KM 1; one ends of three main loop contacts of the breaking contactor KM1 are connected with contacts of power selection relays KA 1-KA 6, and the other ends of the three main loop contacts are connected with input sides of a fuse FU1, a fuse FU2 and a fuse FU 3;
the output side of the fuse FU1 is connected with a Pin1 Pin of a three-phase rectifier bridge, the output side of the fuse FU2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the output side of the fuse FU3 is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the piezoresistor R1 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end of the piezoresistor R1 is connected with a Pin2 Pin of the three-phase rectifier bridge; one end of the piezoresistor R2 is connected with a Pin2 Pin of the three-phase rectifier bridge, and the other end of the piezoresistor R2 is connected with a Pin3 Pin of the three-phase rectifier bridge; one end of the piezoresistor R3 is connected with a Pin1 Pin of the three-phase rectifier bridge, and the other end is connected with a Pin3 Pin of the three-phase rectifier bridge.
2. The control circuit of claim 1, wherein the electromagnet coil L is an exciting coil.
3. The control circuit of claim 1, wherein the resistor R4 is a power resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122411989.3U CN216564515U (en) | 2021-10-08 | 2021-10-08 | Three-phase rectifier bridge control circuit of automatic change-over switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122411989.3U CN216564515U (en) | 2021-10-08 | 2021-10-08 | Three-phase rectifier bridge control circuit of automatic change-over switch |
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| Publication Number | Publication Date |
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| CN216564515U true CN216564515U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122411989.3U Active CN216564515U (en) | 2021-10-08 | 2021-10-08 | Three-phase rectifier bridge control circuit of automatic change-over switch |
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| CN (1) | CN216564515U (en) |
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- 2021-10-08 CN CN202122411989.3U patent/CN216564515U/en active Active
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