CN211654702U - Alternating current contactor anti-interference electric control system - Google Patents
Alternating current contactor anti-interference electric control system Download PDFInfo
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- CN211654702U CN211654702U CN202020807354.8U CN202020807354U CN211654702U CN 211654702 U CN211654702 U CN 211654702U CN 202020807354 U CN202020807354 U CN 202020807354U CN 211654702 U CN211654702 U CN 211654702U
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Abstract
The utility model discloses an alternating current contactor anti-dazzling electric control system includes the power conversion unit, the energy storage unit, the power conversion unit, the protection unit, the drive unit, the acquisition unit, transmission unit and computer central processing unit, the power conversion unit, the acquisition unit, drive unit and transmission unit all are connected with computer central processing unit, the power conversion unit is connected with the energy storage unit, the energy storage unit is connected with the power conversion unit, the power conversion unit includes direct current conversion part and alternating current conversion part, the power conversion unit is connected with drive unit and protection unit. The utility model adopts the above structure an alternating current contactor anti-interference electric control system, during the electric dazzling, convert the DC power supply of energy storage unit storage into the AC power supply the same with input voltage through the power conversion unit, convert the DC power supply of energy storage unit storage into the reliable actuation that required DC voltage maintained the contactor through the power conversion unit when energy-conserving mode.
Description
Technical Field
The utility model relates to an electric automatization field especially relates to an alternating current contactor anti-dazzling electric control system.
Background
With the increasing expansion of grid connection and ring network and the increase of distribution loops caused by the increase of the capacity of a feed transformer, the phenomenon of instantaneous voltage loss, namely 'power dazzling' of a power supply is more and more frequent. When electricity dazzling occurs, industrial alternating current contactors can trip, and then equipment at the rear ends of the contactors is shut down, and the industries such as petrochemical industry, textile industry, integrated circuits and the like generate electricity dazzling every year due to the power grid, so that huge loss is caused. The alternating current contactor is widely applied to a low-voltage motor control system, and due to the characteristics of the working principle, when the power grid is subjected to electric shock, the operation coil of the alternating current contactor is powered off for a short time or the voltage of the alternating current contactor is too low, so that the attraction of the coil to the iron core is smaller than the elastic force of the release spring, and the contactor is released. Generally, the voltage of an alternating current contactor coil is lower than 50% of the rated voltage, and the contactor is released when the duration time exceeds one period; coil voltages below 80% and even higher, contactors will also release for durations exceeding 5 cycles; meanwhile, the suction force generated by the excessively low coil voltage is reduced, so that poor contact of the contactor contact is caused, and the contactor contact is heated and damaged.
However, the ac contactor in the current market is of a dc output type, and the greatest disadvantage is that it cannot be applied to all types of ac contactors, such as a rectifying type, a rectifying + series capacitor type contactor, and a contactor coil contains an electronic tube, a rectifying circuit, etc., and a dc voltage is applied to both ends of the coil, which cannot normally trigger an internal rectifying and voltage stabilizing circuit, so that it is not feasible to use a dc support scheme for such a contactor. Such as: in patents CN102097779A, CN104935077B, CN107068488B, and CN105490566A, dc output forms are used. The application range of the scheme is narrow.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an alternating current contactor anti-interference electric control system, during the electric interference, convert DC power supply into the AC power supply the same with input voltage through the power conversion unit, work is converted DC power supply into the reliable actuation that required adjustable direct current maintained contactor through the power conversion unit when energy-conserving mode.
In order to achieve the above object, the utility model provides an ac contactor anti-dazzling electric control system, including power conversion unit, energy storage unit, power conversion unit, protection unit, drive unit, acquisition unit, transmission unit and computer central processing unit, the power conversion unit the acquisition unit drive unit and transmission unit all with computer central processing unit is connected, the power conversion unit is connected with the energy storage unit, the energy storage unit with the power conversion unit is connected, the power conversion unit includes direct current conversion part and alternating current conversion part, is used for converting direct current power supply into two kinds of power the power conversion unit with the drive unit is connected, the power conversion unit still is connected with the protection unit.
Preferably, the power conversion unit converts an input alternating current power supply into a direct current power supply, the direct current power supply is stored by the energy storage unit, the energy storage unit is an energy storage capacitor, and a capacitor voltage detection circuit is arranged in the energy storage unit.
Preferably, the direct current conversion part and the alternating current conversion part respectively convert a direct current power supply stored by the energy storage unit into an adjustable direct current power supply and an adjustable alternating current power supply, the amplitude and the frequency of the adjustable alternating current power supply are the same as those of an input alternating current power supply, the adjustable alternating current power supply is used for providing energy for a contactor coil during a power interference period, the purpose that power interference can be achieved by any alternating current contactor is guaranteed, and adjustable direct current voltage is output to maintain reliable attraction of the contactor in an energy-saving mode. Preferably, the collection unit includes voltage acquisition circuit, current acquisition circuit and temperature sensor, voltage acquisition circuit current acquisition circuit and temperature sensor transmits the data transmission who gathers to computer central processing unit, and when taking place unusually, computer central processing unit passes through drive unit drive power conversion unit and protection unit and carries out AC power supply for the contactor, and temperature sensor sets up on switching device.
Preferably, the protection unit shapes and transforms an ac power supply and outputs a sinusoidal ac power supply.
Preferably, the transmission unit includes an I/O part for switching value input and output functions and an I/O part for uploading the operating state in real time.
Preferably, the microcomputer central processing unit issues parameters and uploads historical records through a man-machine interface communication part, the man-machine interface communication part adopts a 485 communication interface, the terminal device sets a power-on delay time through the 485 communication interface, voltage is collected in real time, when voltage drop occurs, the microcomputer central processing unit starts timing, when the voltage drop time is greater than the power-on delay time, the microcomputer central processing unit judges that power is normally off, when the voltage drop time is not greater than the power-on delay time, the microcomputer central processing unit judges that power is on, and simultaneously records the power-on time and times and uploads the power to the terminal device.
Therefore, the utility model adopts the above structure an alternating current contactor anti-dazzling electric control system has following beneficial effect:
1. during the electricity interference period, the direct current power supply is converted into the alternating current power supply with the same input voltage through the power conversion unit, the alternating current power supply is suitable for all types of alternating current contactors and alternating current/direct current universal contactors, and after the voltage is recovered, the direct current power supply is converted into the required direct current through the power conversion unit to maintain the reliable attraction of the contactors, so that the contactors work in an energy-saving mode, and 70% -93% of electric energy can be saved.
2. The judgment of power failure and power interference is carried out through the microcomputer central processing unit, the acquisition unit and the man-machine interface communication part, the action of the contactor cannot be influenced under the condition of normal shutdown, and power interference data are uploaded.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic block diagram of an anti-interference electric control system of an ac contactor according to the present invention;
fig. 2 is a schematic circuit diagram of an anti-interference electric control system of an ac contactor of the present invention.
Detailed Description
Examples
Fig. 1 is the utility model relates to an ac contactor anti-interference electric control system schematic block diagram, fig. 2 is the utility model relates to an ac contactor anti-interference electric control system circuit schematic diagram, as shown in the figure, an ac contactor anti-interference electric control system includes power conversion unit, energy storage unit, power conversion unit, protection unit, drive unit, acquisition unit, transmission unit and computer central processing unit. The power supply conversion unit, the acquisition unit, the driving unit and the transmission unit are all connected with the microcomputer central processing unit.
The power conversion unit is connected with the energy storage unit, converts an input alternating current power supply into a DC12V direct current power supply and a DC5V direct current power supply, stores the DC12V direct current power supply through the energy storage unit, the energy storage unit is an energy storage capacitor, a capacitor voltage detection circuit is arranged in the energy storage unit and used for detecting the charging condition of the energy storage capacitor, and after the system is powered on, when the detection capacitor is charged to a set voltage threshold value, parameter initialization setting is carried out. The DC5V DC power supply supplies DC power to the CPU unit of the microcomputer.
The energy storage unit is connected with the power conversion unit, the driving unit and the protection unit are both connected with the power conversion unit, the power conversion unit comprises a direct current conversion part and an alternating current conversion part, a direct current power supply stored in the energy storage unit is converted into an adjustable direct current power supply or an alternating current power supply through the direct current conversion part and the alternating current conversion part, the amplitude and the frequency of the adjustable alternating current power supply are completely the same as those of an input alternating current power supply, for example, when the input alternating current power supply is 220V, the adjustable alternating current power supply is also 220V, the protection unit shapes and transforms the alternating current power supply and outputs a sine wave alternating current power supply, and the adjustable alternating current power supply is used for providing energy for a contactor coil during electricity shaking and is suitable for all types of alternating.
The 32-bit DSP is adopted in the microcomputer central processing unit and used for collecting voltage, collecting current and carrying out circulating detection on temperature, when the voltage is detected to fall to a set value, the AC output loop is disconnected and the AC output loop in the device is closed instantaneously, the DSP outputs PWM control quantity to drive the MOS tube, and a direct current power supply of the energy storage unit is converted into a stable alternating current power supply through the power conversion unit and is applied to an alternating current contactor coil to maintain the normal operation of the alternating current contactor. The contactor works in an energy-saving mode, a direct current output loop in an instantaneous closing device of an alternating current power supply loop is disconnected, a power conversion unit outputs a direct current power supply to maintain the reliable pull-in of the contactor according to a set value, and when the contactor works in the energy-saving mode, the electric energy alternating current contactor which can save 93% at most utilizes the principle of direct current pull-in: the current of the coil of the alternating current contactor is kept unchanged. At this time, the direct current voltage at the two ends of the coil is far smaller than the alternating current voltage amplitude of the coil in the alternating current state, so that most electric energy can be saved when the coil of the alternating current contactor works in the direct current state).
The acquisition unit comprises a voltage acquisition circuit, a current acquisition circuit and a temperature sensor, wherein the voltage acquisition circuit adopts an isolation power supply to supply power, a high-gain linear optical coupler and a filter circuit to match, and interference is avoided. The voltage acquisition circuit, the current acquisition circuit and the temperature sensor transmit acquired data to the microcomputer central processing unit, when abnormality occurs, the microcomputer central processing unit drives the power conversion unit and the protection unit to supply alternating current to the contactor through the driving unit, and the temperature sensor is arranged on the switch device to prevent junction temperature from rising to damage the device to be replaced in time.
The transmission unit comprises an I/O part for switching value input and output functions and a man-machine interface communication part for uploading working states and data in real time. The microcomputer central processing unit sends parameters and uploads historical records through the man-machine interface communication part, the man-machine interface communication part adopts a 485 communication interface, the terminal equipment sets the power-on delay time through the 485 communication interface, the voltage is collected in real time through the collection unit, when voltage drop occurs, the microcomputer central processing unit starts timing, when the voltage drop time is larger than the power-on delay time, the microcomputer central processing unit judges that power is normally off, when the voltage drop time is not larger than the power-on delay time, the microcomputer central processing unit judges that power is on, and simultaneously the microcomputer central processing unit records the power-on time and times and uploads the power to the terminal equipment. The judgment of power failure and power interference is carried out through the microcomputer central processing unit, the acquisition unit and the man-machine interface communication part, the action of the contactor cannot be influenced under the condition of normal shutdown, and power interference data are uploaded.
Therefore, the utility model adopts the above structure an alternating current contactor anti-interference electric control system, during the electricity dazzling, the direct current power supply who stores the energy storage unit through the power conversion unit converts amplitude and frequency and the same alternating current power supply of input voltage into and maintains the normal actuation of contactor during the electricity dazzling. When the contactor works in an energy-saving mode, the direct current power supply is converted into direct current with adjustable amplitude through the power conversion unit to maintain the reliable attraction of the contactor.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. An alternating current contactor anti-interference electric control system is characterized in that: the power conversion unit, the acquisition unit, the driving unit and the transmission unit are all connected with the microcomputer central processing unit, the power conversion unit is connected with the energy storage unit, the energy storage unit is connected with the power conversion unit, the power conversion unit comprises a direct current conversion part and an alternating current conversion part, the power conversion unit is connected with the driving unit, and the power conversion unit is further connected with the protection unit.
2. The ac contactor anti-glare control system according to claim 1, wherein: the power supply conversion unit for converting an input alternating current power supply into a direct current power supply is an energy storage capacitor, and a capacitor voltage detection circuit is arranged in the energy storage unit.
3. The ac contactor anti-glare control system according to claim 2, wherein: the direct current conversion part is connected with a contactor, and the alternating current conversion part is connected with the contactor through a protection unit.
4. The ac contactor anti-glare control system according to claim 3, wherein: the acquisition unit includes voltage acquisition circuit, current acquisition circuit and temperature sensor, voltage acquisition circuit current acquisition circuit and temperature sensor all is connected with computer central processing unit, and temperature sensor sets up on the switching device.
5. The ac contactor anti-glare control system according to claim 4, wherein: the transmission unit comprises an I/O part for switching value input and output functions and a man-machine interface communication part for uploading working states and data in real time, and the man-machine interface communication part adopts a 485 communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020807354.8U CN211654702U (en) | 2020-05-15 | 2020-05-15 | Alternating current contactor anti-interference electric control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020807354.8U CN211654702U (en) | 2020-05-15 | 2020-05-15 | Alternating current contactor anti-interference electric control system |
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| Publication Number | Publication Date |
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| CN211654702U true CN211654702U (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020807354.8U Active CN211654702U (en) | 2020-05-15 | 2020-05-15 | Alternating current contactor anti-interference electric control system |
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| CN (1) | CN211654702U (en) |
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- 2020-05-15 CN CN202020807354.8U patent/CN211654702U/en active Active
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