CN211449823U - Series-parallel automatic switching control system for improving reliability of electromagnetic lock - Google Patents
Series-parallel automatic switching control system for improving reliability of electromagnetic lock Download PDFInfo
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- CN211449823U CN211449823U CN201922472105.8U CN201922472105U CN211449823U CN 211449823 U CN211449823 U CN 211449823U CN 201922472105 U CN201922472105 U CN 201922472105U CN 211449823 U CN211449823 U CN 211449823U
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Abstract
The utility model relates to a promote automatic switch-over control system of series-parallel connection of electromagnetic lock reliability, include: the device comprises a plurality of electromagnetic coils, a time sequence control unit, a series-parallel connection control unit and a surge absorption unit, wherein the series-parallel connection control unit is used for controlling the series-parallel connection of the plurality of electromagnetic coils according to series-parallel connection control signals sent by the time sequence control unit. The utility model discloses solenoid all is supplied power by low voltage (24V) all the time, and four solenoid are parallelly connected during the initial time, progressively switch into four solenoid series connections after the solenoid actuation, and the electric current progressively reduces, has improved the reliability.
Description
Technical Field
The utility model belongs to the technical field of the technique of solenoid valve and specifically relates to a promote series-parallel automatic switch-over control system of electromagnetic lock reliability.
Background
The design of an electromagnetic lock (or called magnetic lock) is the same as that of an electromagnet, and the electromagnetic lock utilizes the principle of electromagnetism generation, when current passes through a silicon steel sheet, the electromagnetic lock can generate strong suction to tightly suck an adsorption iron plate to achieve the effect of locking a door; as long as the small current electromagnetic lock can generate the magnetic force, the access control system controlling the power supply of the electromagnetic lock is powered off after identifying the correctness of personnel, and the electromagnetic lock can be opened after losing the suction force. The electromagnetic lock is mainly suitable for realizing interlocking of a front cabinet door and a rear cabinet door of indoor high-voltage switch equipment by locking parts, prevents misoperation and is an indispensable locking device for power generation and power supply departments. The prior art introduces the power supply who has boost circuit usually to solve the problem that the driving force is not enough when the electromagnetic lock is initially started, and the inside coil that only has of electromagnetic lock utilizes boost circuit to use big voltage (for example 96V) power supply initially, switches into low-voltage (24V) power supply after the electromagnetic lock actuation.
Chinese patent application publication No. CN101866737A discloses an electromagnetic actuator with high-voltage start and low-voltage power-on maintenance, which is an electromagnetic actuator with dc or ac driving coils, and is operated by a switch device to control a power supply device with variable output voltage to drive coils of the electromagnetic actuator, wherein the driving coils are powered on by inputting high-voltage electric energy, and the electromagnetic actuator is controlled by the switch device after being started to switch to the power driving coils outputting low-voltage electric energy to maintain the energization, so that the total current of the driving coils is reduced, but the electromagnetic actuator still satisfies the required operating characteristics after being powered on and actuated, thereby saving electric energy and reducing heat loss.
The above prior art solutions have the following drawbacks: 1. the large voltage (such as 96V) is an unsafe voltage (exceeding 36V), and safety accidents are easily caused; 2. the current is 1A when the large voltage (for example 96V) is supplied, the current is 0.25A when the low voltage (24V) is supplied, the coil is an inductive element, when the coil is switched from 1A to 0.25A, the current cannot suddenly change, the peak current of 1A can impact the interior of the low voltage (24V) power supply to form a loop, the power supply is easy to damage, and the failure rate of the power supply is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a promote the automatic switch-over control system of series-parallel connection of electromagnetic lock reliability to the not enough of prior art existence.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a series-parallel automatic switching control system for improving reliability of an electromagnetic lock comprises: the system comprises a plurality of electromagnetic coils, a time sequence control unit, a series-parallel connection control unit and a surge absorption unit, wherein the series-parallel connection control unit is used for controlling the series-parallel connection of the plurality of electromagnetic coils according to series-parallel connection control signals sent by the time sequence control unit;
the timing control unit comprises an operational amplifier chip, the operational amplifier chip comprises a first comparison unit U3A and a second comparison unit U3B, a reverse input end of the first comparison unit U3A is connected with one end of a resistor R13 and one end of a resistor R14, a forward input end of the first comparison unit U3A is connected with a forward input end of the second comparison unit U3B, one end of a resistor R12 and one end of a capacitor C2, a reverse input end of the second comparison unit U3B is connected with the other end of the resistor R14 and one end of a resistor R15, a power supply end of the operational amplifier chip, the other end of the resistor R12 and the other end of the resistor R13 are used as power supply ends of the timing control unit to be connected with a positive power supply end (V +), a ground end of the operational amplifier chip, the other end of the resistor R15 and the other end of the capacitor C2 are used as ground ends of the timing control unit to be connected with a negative power supply end (V-), an output end of the timing control unit, the output end of the second comparing unit U3B is used as a second output end of the timing control unit;
the surge absorption unit comprises a freewheeling diode D0 and a resistor R0, wherein one end of the resistor R0 is connected with the positive end (V +) of the power supply, the other end of the resistor R0 is connected with the cathode of the freewheeling diode D0, and the anode of the freewheeling diode D0 is connected with the negative end (V-) of the power supply.
By adopting the technical scheme, the series-parallel control signal comprises a parallel control signal, a first series control signal and a second series control signal; at the initial stage of starting the system, the time sequence control unit sends out a parallel control signal to control the plurality of electromagnetic coils to be connected in parallel, after the plurality of electromagnetic coils are attracted for a preset time, the time sequence control unit sends out a first series control signal to control the plurality of electromagnetic coils to be partially connected in series and partially connected in parallel, and after the preset time, the time sequence control unit sends out a second series control signal to control the plurality of electromagnetic coils to be connected in series; the electromagnetic coils are powered by low voltage (24V) all the time, the four electromagnetic coils are connected in parallel initially, and are switched into series connection gradually after being attracted, so that the current is reduced gradually, and the reliability is improved; when the system is initially powered on, the voltages of the reverse input ends of the first comparing unit U3A and the second comparing unit U3B are both higher than the voltages of the respective forward input ends, so that the outputs of the first comparing unit U3A and the second comparing unit U3B are both negative, and a parallel control signal is sent; when the system is powered on for a period of time, the capacitor C2 is charged, voltages begin to accumulate at two ends, and when the voltage at two ends of the capacitor C2 is higher than that at the reverse input end of the second comparing unit U3B, the output of the output end of the second comparing unit U3B changes from negative to positive, so that a first series control signal is sent out; the voltage continues to be accumulated at the two ends of the capacitor C2, and when the voltage at the two ends of the capacitor C2 is higher than that of the reverse input end of the first comparing unit U3B, the output of the output end of the first comparing unit U3A is also changed from negative to positive, so that a second series control signal is sent out; the surge absorbing unit is used for absorbing a voltage input part exceeding a normal operation voltage of the system, so that a voltage supplied to the system is clamped within a preset safe voltage (for example, 40V), and the resistor R0 can be a 0 ohm resistor.
The present invention may be further configured in a preferred embodiment as: the series-parallel connection control unit comprises an isolation unit, a voltage division unit and a switch unit, wherein the isolation unit is used for controlling the on-off of the voltage division unit according to the series-parallel connection control signal so as to control the on-off of the switch unit.
By adopting the technical scheme, the isolation unit is used for controlling the on-off of the voltage division unit according to the series-parallel connection control signal so as to control the on-off of the switch unit.
The present invention may be further configured in a preferred embodiment as: the isolation unit comprises a first isolation unit and a second isolation unit, the first isolation unit comprises an optocoupler U1, a resistor R5 and a resistor R8, and the second isolation unit comprises an optocoupler U2, a resistor R7 and a resistor R9; one end of the resistor R5 and one end of the resistor R7 are connected with a power supply end of the timing control unit, the other end of the resistor R5 is connected with one end of the resistor R8 and an input positive end of an optocoupler U1, an input negative end of the optocoupler U1 is connected with the other end of the resistor R8 and a first output end of the timing control unit, the other end of the resistor R7 is connected with one end of the resistor R9 and an input positive end of an optocoupler U2, and an input negative end of the optocoupler U2 is connected with the other end of the resistor R9 and a second output end of the timing control; the output end of the optical coupler U1 is used as the output end of the first isolation unit, and the output end of the optical coupler U2 is used as the output end of the second isolation unit.
By adopting the technical scheme, the optical coupler is used as the isolating switch, the input end and the output end are completely electrically isolated, the anti-interference capability is strong, the service life is long, and the transmission efficiency is high; when the time sequence control unit sends a parallel control signal, the input ends of the optocoupler U1 and the optocoupler U2 are both conducted, so that the output ends are both controlled to be conducted; when the time sequence control unit sends out a first serial control signal, the input end of the optocoupler U1 is conducted to control the conduction of the output end thereof, and the input end of the optocoupler U2 is closed to control the closing of the output end thereof; when the timing control unit sends out the second series control signal, the input ends of the optocoupler U1 and the optocoupler U2 are all closed, so that the control output ends are all closed.
The present invention may be further configured in a preferred embodiment as: the voltage division unit comprises a first voltage division unit and a second voltage division unit, the first voltage division unit comprises a resistor R3, a resistor R6 and a resistor R11, and the second voltage division unit comprises a resistor R2, a resistor R4 and a resistor R10; the power supply positive terminal (V +) is connected to one end of the resistor R3 and one end of the resistor R2, the other end of the resistor R3 is connected to one end of the resistor R6 as the first control terminal of the first voltage dividing unit, the other end of the resistor R6 is connected in series with the output terminal of the first isolating unit and then connected to one end of the resistor R11 as the second control terminal of the first voltage dividing unit, the other end of the resistor R2 is connected to one end of the resistor R4 as the first control terminal of the second voltage dividing unit, the other end of the resistor R4 is connected in series with the output terminal of the second isolating unit and then connected to one end of the resistor R10 as the second control terminal of the second voltage dividing unit, and the other ends of the resistor R10 and the resistor R11 are connected to the power supply negative terminal (V-).
By adopting the technical scheme, the first voltage division unit controls the output signals of the first control end and the second control end of the ground according to the on and off of the optical coupler U1, and the second voltage division unit controls the output signals of the first control end and the second control end of the ground according to the on and off of the optical coupler U2.
The present invention may be further configured in a preferred embodiment as: the switch unit comprises a first switch unit and a second switch unit, wherein the first switch unit comprises a PMOS tube Q2, a PMOS tube Q3, an NMOS tube Q5 and an NMOS tube Q6, the second switch unit comprises a PMOS tube Q1 and an NMOS tube Q4, and the plurality of electromagnetic coils comprise an electromagnetic coil LOD1, an electromagnetic coil LOD2, an electromagnetic coil LOD3 and an electromagnetic coil LOD 4; the grid of the PMOS tube Q2 and the grid of the PMOS tube Q3 are connected with the first control end of the first voltage division unit, one end of the electromagnetic coil LOD1, the source of the PMOS tube Q1, the source of the PMOS tube Q2 and the source of the PMOS tube Q3 are connected with the positive end (V +) of a power supply, the drain of the PMOS tube Q3 is connected with the other end of the electromagnetic coil LOD1, one end of the electromagnetic coil LOD2 and the drain of the NMOS tube Q6, the drain of the PMOS tube Q2 is connected with the other end of the electromagnetic coil LOD2, one end of the electromagnetic coil LOD3 and the drain of the NMOS tube Q5, the grid of the PMOS tube Q1 is connected with the first control end of the second voltage division unit, the drain of the PMOS tube Q1 is connected with the other end of the electromagnetic coil LOD 9, one end of the electromagnetic coil LOD4 and the drain of the NMOS tube Q4, the source of the electromagnetic coil LOD4, the negative end of the NMOS tube Q4, the source of the NMOS tube Q5 and the source of the NMOS tube Q874, the gate of the NMOS transistor Q4 is connected to the second control terminal of the second voltage-dividing unit.
By adopting the technical scheme, when the time sequence control unit sends out parallel control signals, the PMOS tube Q1, the PMOS tube Q2, the PMOS tube Q3, the NMOS tube Q4, the NMOS tube Q5 and the NMOS tube Q6 are all conducted, so that the electromagnetic coil LOD1, the electromagnetic coil LOD2, the electromagnetic coil LOD3 and the electromagnetic coil LOD4 are controlled to be connected in parallel; when the time sequence control unit sends out a first series control signal, the PMOS tube Q1 and the NMOS tube Q4 are closed, and the PMOS tube Q2, the PMOS tube Q3, the NMOS tube Q5 and the NMOS tube Q6 are conducted, so that the electromagnetic coil LOD3 and the electromagnetic coil LOD4 are controlled to be connected in series and then connected in parallel with the electromagnetic coil LOD1 and the electromagnetic coil LOD 2; when the timing control unit sends out a second series control signal, the PMOS tube Q1, the PMOS tube Q2, the PMOS tube Q3, the NMOS tube Q4, the NMOS tube Q5 and the NMOS tube Q6 are all closed, so that the electromagnetic coil LOD1, the electromagnetic coil LOD2, the electromagnetic coil LOD3 and the electromagnetic coil LOD4 are controlled to be connected in series.
The present invention may be further configured in a preferred embodiment as: the power supply system also comprises a self-recovery fuse, and the positive end (V +) of the power supply is connected with the self-recovery fuse in series and then supplies power to the system.
By adopting the technical scheme, the self-recovery fuse has the functions of high-temperature self-fusing, low-temperature self-recovery, over-current self-fusing and normal current self-recovery.
The present invention may be further configured in a preferred embodiment as: the voltage reduction unit comprises a voltage stabilizing diode D1 and a resistor R1, one end of the resistor R1 is connected with the self-recovery fuse, the other end of the resistor R1 is connected with the cathode of the voltage stabilizing diode D1, and the anode of the voltage stabilizing diode D1 is connected with the power supply end of the timing control unit.
By adopting the technical scheme, the voltage reduction circuit is used for reducing the voltage of the input power supply, so that the voltage supplied to the time sequence control unit does not exceed the highest voltage which can be borne by the time sequence control unit.
To sum up, the utility model discloses a following at least one useful technological effect:
1. the electromagnetic coils are powered by low voltage (24V) all the time, the four electromagnetic coils are connected in parallel initially, the electromagnetic coils are switched into the four electromagnetic coils to be connected in series gradually after being attracted, the current is reduced gradually, and the reliability is improved;
2. the self-recovery fuse has the functions of high-temperature self-fusing, low-temperature self-recovery, over-current self-fusing and normal current self-recovery, so that the over-temperature and over-current protection functions are realized;
3. the surge absorbing unit is used for absorbing the voltage input part exceeding the normal operation voltage of the system, so that the voltage supplied to the system is clamped within the preset safe voltage (for example, 40V), and the resistor R0 can be a resistor of 0 ohm.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, do the utility model discloses a promote automatic switch-over control system of series-parallel connection of electromagnetic lock reliability, include: the electromagnetic coil protection device comprises a plurality of electromagnetic coils, a time sequence control unit 1, a series-parallel connection control unit and a surge absorption unit 7, wherein the series-parallel connection control unit is used for controlling the series-parallel connection of the plurality of electromagnetic coils according to series-parallel connection control signals sent by the time sequence control unit 1;
the timing control unit 1 comprises an operational amplifier chip, the operational amplifier chip comprises a first comparison unit U3A and a second comparison unit U3B, a reverse input end of the first comparison unit U3A is connected with one end of a resistor R13 and one end of a resistor R14, a forward input end of the first comparison unit U3A is connected with a forward input end of the second comparison unit U3B, one end of a resistor R12 and one end of a capacitor C2, a reverse input end of the second comparison unit U3B is connected with the other end of the resistor R14 and one end of a resistor R15, a power supply end of the operational amplifier chip, the other end of the resistor R12 and the other end of the resistor R13 are used as power supply ends of the timing control unit to be connected with a power supply negative end (V +), a ground end of the operational amplifier chip, the other end of the resistor R15 and the other end of the capacitor C2 are used as ground ends of the timing control unit to be connected with a power supply negative end (V-), an output end of the timing control unit, the output end of the second comparing unit U3B is used as a second output end of the timing control unit;
the surge absorption unit 7 comprises a freewheeling diode D0 and a resistor R0, wherein one end of the resistor R0 is connected with the positive end (V +) of the power supply, the other end of the resistor R0 is connected with the cathode of the freewheeling diode D0, and the anode of the freewheeling diode D0 is connected with the negative end (V-) of the power supply.
The series-parallel control signal comprises a parallel control signal, a first series control signal and a second series control signal; at the initial stage of starting the system, the time sequence control unit 1 sends out a parallel control signal to control the plurality of electromagnetic coils to be connected in parallel, after the plurality of electromagnetic coils are attracted for a preset time, the time sequence control unit 1 sends out a first series control signal to control the plurality of electromagnetic coils to be connected in series and partially connected in parallel, and after the preset time, the time sequence control unit 1 sends out a second series control signal to control the plurality of electromagnetic coils to be connected in series.
When the system is initially powered on, the voltages of the reverse input ends of the first comparing unit U3A and the second comparing unit U3B are both higher than the voltages of the respective forward input ends, so that the outputs of the first comparing unit U3A and the second comparing unit U3B are both negative, and a parallel control signal is sent; when the system is powered on for a period of time, the capacitor C2 is charged, voltages begin to accumulate at two ends, and when the voltage at two ends of the capacitor C2 is higher than that at the reverse input end of the second comparing unit U3B, the output of the output end of the second comparing unit U3B changes from negative to positive, so that a first series control signal is sent out; the voltage continues to accumulate across the capacitor C2, and when the voltage across the capacitor C2 is higher than the voltage at the inverting input terminal of the first comparing unit U3B, the output at the output terminal of the first comparing unit U3A also changes from negative to positive, thereby sending out a second series control signal.
With reference to fig. 1, the series-parallel control unit includes an isolation unit, a voltage dividing unit, and a switch unit, and the isolation unit is configured to control on/off of the voltage dividing unit according to the series-parallel control signal, and further control on/off of the switch unit.
With continued reference to fig. 1, the isolation unit includes a first isolation unit 2 and a second isolation unit 3, the first isolation unit 2 includes an optocoupler U1, a resistor R5 and a resistor R8, and the second isolation unit 3 includes an optocoupler U2, a resistor R7 and a resistor R9; one end of the resistor R5 and one end of the resistor R7 are connected with a power supply end of the timing control unit 1, the other end of the resistor R5 is connected with one end of the resistor R8 and an input positive end of an optocoupler U1, an input negative end of the optocoupler U1 is connected with the other end of the resistor R8 and a first output end of the timing control unit 1, the other end of the resistor R7 is connected with one end of the resistor R9 and an input positive end of an optocoupler U2, and an input negative end of the optocoupler U2 is connected with the other end of the resistor R9 and a second output end of the timing control unit; the output end of the optical coupler U1 is used as the output end of the first isolation unit 2, and the output end of the optical coupler U2 is used as the output end of the second isolation unit 3. The optical coupler is used as an isolating switch, the input end and the output end are completely electrically isolated, the anti-interference capability is strong, the service life is long, and the transmission efficiency is high; when the sequential control unit 1 sends a parallel control signal, the input ends of the optocoupler U1 and the optocoupler U2 are both conducted, so that the output ends are both controlled to be conducted; when the timing control unit 1 sends out a first series control signal, the input end of the optocoupler U1 is conducted to control the conduction of the output end thereof, and the input end of the optocoupler U2 is closed to control the closing of the output end thereof; when the timing control unit 1 sends out the second series control signal, the input ends of the optical coupler U1 and the optical coupler U2 are both closed, so that the control output ends are both closed.
With continued reference to fig. 1, the voltage dividing unit includes a first voltage dividing unit 4 and a second voltage dividing unit 5, the first voltage dividing unit 4 includes a resistor R3, a resistor R6, and a resistor R11, and the second voltage dividing unit 5 includes a resistor R2, a resistor R4, and a resistor R10; the power supply positive terminal (V +) is connected to one end of the resistor R3 and one end of the resistor R2, the other end of the resistor R3 is connected to one end of the resistor R6 as the first control terminal of the first voltage dividing unit 4, the other end of the resistor R6 is connected in series to the output terminal of the first isolating unit 2 and then connected to one end of the resistor R11 as the second control terminal of the first voltage dividing unit 4, the other end of the resistor R2 is connected to one end of the resistor R4 as the first control terminal of the second voltage dividing unit 5, the other end of the resistor R4 is connected in series to the output terminal of the second isolating unit 3 and then connected to one end of the resistor R10 as the second control terminal of the second voltage dividing unit 5, and the other ends of the resistor R10 and the resistor R11 are connected to the power supply negative terminal (V-).
With continued reference to fig. 1, the switch unit includes a first switch unit including a PMOS transistor Q2, a PMOS transistor Q3, an NMOS transistor Q5, and an NMOS transistor Q6, and a second switch unit including a PMOS transistor Q1 and an NMOS transistor Q4, and the plurality of electromagnetic coils include an electromagnetic coil LOD1, an electromagnetic coil LOD2, an electromagnetic coil LOD3, and an electromagnetic coil LOD 4; the grid electrode of the PMOS tube Q2 and the grid electrode of the PMOS tube Q3 are connected with the first control end of the first voltage division unit 4, one end of the electromagnetic coil LOD1, the source electrode of the PMOS tube Q1, the source electrode of the PMOS tube Q2 and the source electrode of the PMOS tube Q3 are connected with the positive end (V +) of a power supply, the drain electrode of the PMOS tube Q3 is connected with the other end of the electromagnetic coil LOD1, one end of the electromagnetic coil LOD2 and the drain electrode of the NMOS tube Q6, the drain electrode of the PMOS tube Q2 is connected with the other end of the electromagnetic coil LOD2, one end of the electromagnetic coil LOD3 and the drain electrode of the NMOS tube Q5, the grid electrode of the PMOS tube Q1 is connected with the first control end of the second voltage division unit 5, the drain electrode of the PMOS tube Q1 is connected with the other end of the electromagnetic coil LOD3, one end of the electromagnetic coil LOD4 and the drain electrode of the NMOS tube Q4, the source electrode of the electromagnetic coil LOD4, the source electrode of the NMOS tube Q4, the grid electrode of the NMOS tube, the gate of the NMOS transistor Q4 is connected to the second control terminal of the second voltage-dividing unit 5.
When the time sequence control unit 1 sends out parallel control signals, the PMOS tube Q1, the PMOS tube Q2, the PMOS tube Q3, the NMOS tube Q4, the NMOS tube Q5 and the NMOS tube Q6 are all conducted, so that the electromagnetic coil LOD1, the electromagnetic coil LOD2, the electromagnetic coil LOD3 and the electromagnetic coil LOD4 are controlled to be connected in parallel; when the time sequence control unit 1 sends out a first series control signal, the PMOS tube Q1 and the NMOS tube Q4 are closed, and the PMOS tube Q2, the PMOS tube Q3, the NMOS tube Q5 and the NMOS tube Q6 are conducted, so that the electromagnetic coil LOD3 and the electromagnetic coil LOD4 are controlled to be connected in series and then connected in parallel with the electromagnetic coil LOD1 and the electromagnetic coil LOD 2; when the timing control unit 1 sends out the second series control signal, the PMOS transistor Q1, the PMOS transistor Q2, the PMOS transistor Q3, the NMOS transistor Q4, the NMOS transistor Q5 and the NMOS transistor Q6 are all turned off, so as to control the electromagnetic coil LOD1, the electromagnetic coil LOD2, the electromagnetic coil LOD3 and the electromagnetic coil LOD4 to be connected in series.
Preferably, the timing control unit 1 may also include three comparison units, and correspondingly, the three comparison units respectively control on/off of three optocouplers, and the three optocouplers respectively control one PMOS transistor and one NMOS transistor, thereby achieving a more refined effect of gradually reducing current.
With continued reference to fig. 1, the system further includes a self-recovery Fuse2, and the positive terminal (V +) of the power supply is connected in series with the self-recovery Fuse2 to supply power to the system. The Fuse2 has the functions of high-temperature self-fusing, low-temperature self-recovering, over-current self-fusing and normal-current self-recovering.
With continued reference to fig. 1, the timing control unit further includes a voltage reducing unit 6, where the voltage reducing unit 6 includes a zener diode D1 and a resistor R1, one end of the resistor R1 is connected to the self-recovery fuse, the other end of the resistor R1 is connected to the cathode of the zener diode D1, and the anode of the zener diode D1 is connected to the power source terminal of the timing control unit 1. For decompressing the input power so that the voltage supplied to the timing control unit 1 does not exceed the maximum voltage it can withstand. Preferably, the device further comprises a capacitor C1, one end of the capacitor C1 is connected with the anode of the zener diode D1, and the other end of the capacitor C1 is connected with the negative terminal (V-) of the power supply.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (7)
1. The utility model provides a promote series-parallel automatic switch control system of electromagnetic lock reliability which characterized in that includes: the system comprises a plurality of electromagnetic coils, a time sequence control unit, a series-parallel connection control unit and a surge absorption unit, wherein the series-parallel connection control unit is used for controlling the series-parallel connection of the plurality of electromagnetic coils according to series-parallel connection control signals sent by the time sequence control unit;
the timing control unit comprises an operational amplifier chip, the operational amplifier chip comprises a first comparison unit U3A and a second comparison unit U3B, a reverse input end of the first comparison unit U3A is connected with one end of a resistor R13 and one end of a resistor R14, a forward input end of the first comparison unit U3A is connected with a forward input end of the second comparison unit U3B, one end of a resistor R12 and one end of a capacitor C2, a reverse input end of the second comparison unit U3B is connected with the other end of the resistor R14 and one end of a resistor R15, a power supply end of the operational amplifier chip, the other end of the resistor R12 and the other end of the resistor R13 are used as power supply ends of the timing control unit to be connected with a positive power supply end (V +), a ground end of the operational amplifier chip, the other end of the resistor R15 and the other end of the capacitor C2 are used as ground ends of the timing control unit to be connected with a negative power supply end (V-), an output end of the timing control unit, the output end of the second comparing unit U3B is used as a second output end of the timing control unit;
the surge absorption unit comprises a freewheeling diode D0 and a resistor R0, wherein one end of the resistor R0 is connected with the positive end (V +) of the power supply, the other end of the resistor R0 is connected with the cathode of the freewheeling diode D0, and the anode of the freewheeling diode D0 is connected with the negative end (V-) of the power supply.
2. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 1, wherein: the series-parallel connection control unit comprises an isolation unit, a voltage division unit and a switch unit, wherein the isolation unit is used for controlling the on-off of the voltage division unit according to the series-parallel connection control signal so as to control the on-off of the switch unit.
3. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 2, wherein: the isolation unit comprises a first isolation unit and a second isolation unit, the first isolation unit comprises an optocoupler U1, a resistor R5 and a resistor R8, and the second isolation unit comprises an optocoupler U2, a resistor R7 and a resistor R9; one end of the resistor R5 and one end of the resistor R7 are connected with a power supply end of the timing control unit, the other end of the resistor R5 is connected with one end of the resistor R8 and an input positive end of an optocoupler U1, an input negative end of the optocoupler U1 is connected with the other end of the resistor R8 and a first output end of the timing control unit, the other end of the resistor R7 is connected with one end of the resistor R9 and an input positive end of an optocoupler U2, and an input negative end of the optocoupler U2 is connected with the other end of the resistor R9 and a second output end of the timing control; the output end of the optical coupler U1 is used as the output end of the first isolation unit, and the output end of the optical coupler U2 is used as the output end of the second isolation unit.
4. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 3, wherein: the voltage division unit comprises a first voltage division unit and a second voltage division unit, the first voltage division unit comprises a resistor R3, a resistor R6 and a resistor R11, and the second voltage division unit comprises a resistor R2, a resistor R4 and a resistor R10; the power supply positive terminal (V +) is connected to one end of the resistor R3 and one end of the resistor R2, the other end of the resistor R3 is connected to one end of the resistor R6 as the first control terminal of the first voltage dividing unit, the other end of the resistor R6 is connected in series with the output terminal of the first isolating unit and then connected to one end of the resistor R11 as the second control terminal of the first voltage dividing unit, the other end of the resistor R2 is connected to one end of the resistor R4 as the first control terminal of the second voltage dividing unit, the other end of the resistor R4 is connected in series with the output terminal of the second isolating unit and then connected to one end of the resistor R10 as the second control terminal of the second voltage dividing unit, and the other ends of the resistor R10 and the resistor R11 are connected to the power supply negative terminal (V-).
5. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 4, wherein: the switch unit comprises a first switch unit and a second switch unit, wherein the first switch unit comprises a PMOS tube Q2, a PMOS tube Q3, an NMOS tube Q5 and an NMOS tube Q6, the second switch unit comprises a PMOS tube Q1 and an NMOS tube Q4, and the plurality of electromagnetic coils comprise an electromagnetic coil LOD1, an electromagnetic coil LOD2, an electromagnetic coil LOD3 and an electromagnetic coil LOD 4; the grid of the PMOS tube Q2 and the grid of the PMOS tube Q3 are connected with the first control end of the first voltage division unit, one end of the electromagnetic coil LOD1, the source of the PMOS tube Q1, the source of the PMOS tube Q2 and the source of the PMOS tube Q3 are connected with the positive end (V +) of a power supply, the drain of the PMOS tube Q3 is connected with the other end of the electromagnetic coil LOD1, one end of the electromagnetic coil LOD2 and the drain of the NMOS tube Q6, the drain of the PMOS tube Q2 is connected with the other end of the electromagnetic coil LOD2, one end of the electromagnetic coil LOD3 and the drain of the NMOS tube Q5, the grid of the PMOS tube Q1 is connected with the first control end of the second voltage division unit, the drain of the PMOS tube Q1 is connected with the other end of the electromagnetic coil LOD 9, one end of the electromagnetic coil LOD4 and the drain of the NMOS tube Q4, the source of the electromagnetic coil LOD4, the negative end of the NMOS tube Q4, the source of the NMOS tube Q5 and the source of the NMOS tube Q874, the gate of the NMOS transistor Q4 is connected to the second control terminal of the second voltage-dividing unit.
6. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 1, wherein: the power supply system also comprises a self-recovery fuse, and the positive end (V +) of the power supply is connected with the self-recovery fuse in series and then supplies power to the system.
7. The series-parallel automatic switching control system for improving the reliability of the electromagnetic lock according to claim 6, wherein: the voltage reduction unit comprises a voltage stabilizing diode D1 and a resistor R1, one end of the resistor R1 is connected with the self-recovery fuse, the other end of the resistor R1 is connected with the cathode of the voltage stabilizing diode D1, and the anode of the voltage stabilizing diode D1 is connected with the power supply end of the timing control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922472105.8U CN211449823U (en) | 2019-12-31 | 2019-12-31 | Series-parallel automatic switching control system for improving reliability of electromagnetic lock |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922472105.8U CN211449823U (en) | 2019-12-31 | 2019-12-31 | Series-parallel automatic switching control system for improving reliability of electromagnetic lock |
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| CN211449823U true CN211449823U (en) | 2020-09-08 |
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| CN201922472105.8U Active CN211449823U (en) | 2019-12-31 | 2019-12-31 | Series-parallel automatic switching control system for improving reliability of electromagnetic lock |
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| CN (1) | CN211449823U (en) |
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