CN103560476A - Anti-interference electricity module in bypass mode and control method of anti-interference electricity module - Google Patents

Abstract

The invention relates to an anti-interference electricity module in a bypass mode and a control method of the anti-interference electricity module. The anti-interference electricity module comprises a single-chip microcomputer, an electromagnetic relay, a solid-state relay, an energy storage capacitor set, an AC/DC switching power supply, a DC/DC power supply, a voltage conversion chip, an alternating voltage sampler and a state detector, wherein two ends of the alternating voltage sampler and two ends of the state detector are respectively in signal connection with a grid and the single-chip microcomputer. The input end and the output end of the AC/DC switching power supply are respectively and electrically connected with the grid and the energy storage capacitor set, and the output end of the energy storage capacitor set is electrically connected with the single-chip microcomputer and a contactor respectively through the voltage conversion chip and the DC/DC power supply. A normally closed contact of the electromagnetic relay is arranged on the grid, and a normally open contact of the electromagnetic relay and a normally open contact of the solid-state relay are connected in series on a direct current power supply loop. The anti-interference electricity module can supply alternating current and direct current to the contactor respectively in the normal running process and the electricity interference process, the defects of starting of pulsating direct current are overcome, and pull-in of the contactor is maintained, so the reliability is high and operational requirements of a continuous production line can be met.

Description

An anti-shaking module and its control method using bypass mode

technical field

The invention belongs to the technical field of anti-sway electricity in electric power systems, in particular to an anti-sway electricity module in bypass mode and its application in 380V and 220V low-voltage network systems of industrial enterprises to prevent abnormal tripping of contactors. Control Method.

Background technique

During the operation of the power system, due to lightning strikes, short-circuit to ground, fault reclosing, backup self-switching, external and internal power grid faults, large-scale equipment start-up, etc., the power grid faults caused by them will cause large instantaneous voltage fluctuations. Or short-term power failure and recovery, this phenomenon is called "shake power".

There are mainly the following situations:

(1) The voltage dips and rises for a duration of 0.5 cycle to 1 min, and the voltage rises to 110-180% of the nominal voltage or drops to 10-90% of the nominal voltage. the

(2) Voltage flicker, the voltage waveform envelope shows a regular change or a series of random changes in the voltage amplitude, which generally manifests as the human eye's visual perception of abnormal lighting caused by voltage fluctuations. the

(3) Short-term power outages, power supply interruptions lasting from 0.5 cycles to 3S (such as standby automatic switching, reclosing, etc.). the

Akira's influence:

(1) The impact of shaking electricity on the control electrical appliances of the power supply circuit

Contactors are widely used in low-voltage motor control systems, accounting for a considerable proportion. Due to the characteristics of the working principle of the electromagnetic contactor, when there is swaying electricity in the power grid, the working coil of the contactor will be cut off for a short time or the voltage will be too low, resulting in the suction force of the dynamic and static iron cores that rely on current to maintain attraction is less than the elastic force of the release spring , the important reason for the release of the contactor to cause tripping and shutdown. Action characteristics of electromagnetic contactor: According to the international IEC standard, 80% of the rated voltage is the critical and reliable pull-in voltage. The critical release voltage is 20% to 70% of the rated working voltage. In field use, the electromagnetic contactor is generally released at 50% of the nominal voltage. Therefore, the electromagnetic contactor is uncontrolled due to "shaking electricity" and the natural tripping and shutdown is the Due to the principle.

(2) Causes of tripping and shutdown caused by "shock electricity"

With the development of the power grid, the continuous expansion of capacity and scale, the frequency of swaying electricity is increasing. Due to the increasing scale of production equipment in modern industrial and mining enterprises, although the duration of swaying electricity is relatively short, it has an impact on production. But very huge. Instantaneous voltage fluctuations will cause hundreds of motors to trip and equipment to shut down. After the power grid voltage is restored, the motors cannot resume operation by themselves, which will lead to continuous production process disorder and may cause production and equipment accidents. For large installations, it takes a long time to recover manually, and for some unattended field installations, the recovery time is even longer. For continuous production equipment such as petroleum, chemical, and pesticide, a series of losses such as safety, environmental protection, waste products, waste of raw materials, reduced output, and low efficiency are very huge. the

(3) The impact of shaking electricity on the motor of the power supply circuit

Due to the low voltage of the shaking power, the motor will be over-current, which will trip the motor thermal protection action. The short few seconds of "shock electricity" is catastrophic for enterprises that require a large number of equipment in continuous production and does not allow motors to trip and shut down in the process. The light ones are hundreds of thousands or tens of millions of economic losses, and serious ones will happen. Fires, explosions and even personal safety are really a few seconds of disaster for enterprises. the

For this reason, the anti-sway power module is available and used in continuous production lines, which can keep the contactor from tripping when the power supply system loses voltage or power (commonly known as sway power) due to lightning strikes, short-circuit coincidence, etc.; The operation of connecting and breaking is exactly the same as that of conventional contactors. When the accidental power outage exceeds the time limit of the anti-sway power module, the contactor will trip, achieving the purpose of avoiding the power swing and maintaining continuous production without stopping. The anti-sway power module has played an active role in guaranteeing petroleum, chemical, steel and other enterprises. It can effectively resist power supply voltage instability, instantaneous voltage loss, and instantaneous power failure, and meets the high requirements of continuous production lines.

At present, the existing anti-shaking modules are all in online mode, that is, the power supply is supplied to the contactor for a long time. If a power failure and a failure of the control part occur, that is, the delayed anti-shaking function will fail and be damaged, which will affect the normal operation of the continuous production line. The specific performance is:

1. Starting method: pulsating DC starting contactor is easy to burn out the contactor coil and device components; when pulsating DC starting contactor, when using a large-capacity contactor, the internal resistance of the contactor is very small (2 to 10 ohms); ( 1) It is easy to burn out the contactor: because the internal resistance of the contactor is small, the current through the contactor coil is very large (tens of amperes) under the condition of constant pulsating DC voltage, which makes the contactor coil easy to damage; (2) easy to burn Device device: Because the device itself switches the higher pulsating DC to the DC voltage provided by the switching power supply by controlling the electromagnetic relay, the large current flows through the electromagnetic relay of the device; in this case, the control circuit part of the device The device is easy to burn out.

2. The principle of the control part: The control part is easy to burn out the contacts of the electromagnetic relay and the internal circuit board of the device, thereby reducing the service life of the device; (1) Because the device uses an electromagnetic relay, most electromagnetic relay contacts have a DC capacity of on and off Not high, when the DC current flows through the electromagnetic relay contact greater than the rated value of the electromagnetic relay, the electromagnetic relay contact will appear "arcing" when it is released, so the electromagnetic relay contact often burns out, which may sometimes cause the electromagnetic relay to catch fire. Seriously, it will lead to fire; (2) If the electromagnetic relay burns out due to "arcing", there are two possibilities for the contacts of the electromagnetic relay. Dead on the same side (normally open or normally closed), the second possibility is: the contact of the electromagnetic relay connected to the live wire is "sticky" on the normally open side and the contact of the electromagnetic relay connected to the neutral line is "sticky" to the normally closed side. Or the contact of the electromagnetic relay connected to the live wire is "sticky" on the normally closed side and the contact of the electromagnetic relay connected to the neutral line is "sticky" to the normally open side; when the first case occurs, it only affects the device and cannot control the switching action, resulting in The anti-shaking function of the device fails; when the second situation occurs, the AC power and the DC power provided by the switching power supply are short together, which leads to circuit board burnout, device burnout, and power supply circuit protection tripping.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a method that can supply alternating current and direct current to the contactor during normal operation and when swaying electricity occurs, so as to realize the uninterrupted power supply of the contactor and solve the problem of pulsating direct current starting contact. The anti-swaying module and its control method in bypass mode fully meet the long-term stable operation requirements of the continuous production line to eliminate the defects of the contactor, maintain the contactor pull-in, and fully meet the long-term stable operation requirements of the continuous production line. the

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

An anti-shake module using bypass mode, including single-chip microcomputer, electromagnetic relay, solid state relay, energy storage capacitor bank, AC/DC switching power supply, DC/DC power supply, voltage conversion chip, AC voltage sampler and state detector ; Wherein, the input end and the output end of the AC/DC switching power supply are respectively electrically connected to the input end of the power grid and the energy storage capacitor group, and one output end of the energy storage capacitor group is electrically connected to the single-chip electromechanical device through a voltage conversion chip, The other output end is electrically connected to the input end of the DC/DC power supply; the output end of the DC/DC power supply is electrically connected to the contactor provided on the power grid through the DC power supply circuit; the AC voltage sampler and the state detector The input terminal and the output terminal are respectively connected with the grid and the single-chip microcomputer signal; the output terminal of the single-chip microcomputer is connected with the electromagnetic relay and the solid-state relay signal, and the normally closed contacts J1A and J1D of the electromagnetic relay are arranged on the grid to connect the grid and contact device, its normally open contacts J1B, J1C and the normally open contact J2 of the solid state relay are connected in series on the DC power supply circuit.

Further, the normally closed contacts J1A and J1D of the electromagnetic relay are respectively set on the N line and the L line of the power grid; the DC power supply circuit is connected to the N line and the L line behind the normally closed contacts J1A and J1D of the electromagnetic relay , and the normally open contact J1B of the electromagnetic relay and the normally open contact J2 of the solid state relay are connected in series with the DC power supply circuit connected to the N line of the grid, and the normally open contact J1C of the electromagnetic relay is connected in series with the L line of the grid On the connected DC power supply circuit; the input end of the AC voltage sampler is connected on the N line and the L line in front of the normally closed contact J1A, J1D of the electromagnetic relay, and the input end of the state detector is connected on the L line, And it is located at the rear of the DC power supply circuit with the normally open contact J1C of the electromagnetic relay connected in series.

Further, the AC voltage sampler is a transformer; the state detector is mainly composed of two sets of diodes, a DC optocoupler and an AC-DC dual-purpose optocoupler, wherein the two sets of diodes are connected in reverse parallel, and Each group of diodes is composed of two diodes in series, and the DC optocoupler and the AC/DC dual-purpose optocoupler are connected in parallel to the two groups of diodes.

Further, the voltage conversion chip is an LDO power chip, and the energy storage capacitor group is composed of seven 10F/2.5V supercapacitors connected in series.

Further, the anti-shaking module also includes a voltage monitor, which is mainly composed of a Zener diode and a DC optocoupler, and its two ends are respectively connected to the DC/DC power supply and the signal of the single-chip microcomputer.

Further, a fuse is connected in series on the DC power supply circuit, and an EMC power filter is provided at the input end of the AC/DC switching power supply.

A control method for an anti-sway module using a bypass mode. During normal operation, the AC power is supplied through the grid to start the contactor, so that the contactor is closed and does not trip; when the sway occurs, the DC power is supplied through the bypass to maintain the contactor. Suction, no release.

Further, the control method of the anti-shaking module in the bypass mode specifically includes the following steps:

a. Start - after power on, operate the start button;

b. AC power supply - the power grid supplies AC power to the contactor through the normally closed contacts J1A and J1D of the electromagnetic relay;

c. Status monitoring—the status detector detects and judges the status of the contactor in real time and the way to maintain the pull-in status;

d. Electricity monitoring - the AC voltage sampler collects the input voltage value of the power grid in real time, and judges whether the input voltage meets the requirements of the electricity criterion;

e. Bypass DC power supply - when the shaking power condition is met, the normally closed contacts J1A and J1D of the electromagnetic relay controlled by the microcontroller are opened, the normally open contacts J1B and J1C of the electromagnetic relay and the normally open contact J2 of the solid state relay are closed, and finally the energy storage capacitor The group supplies DC power to the contactor through the DC/DC power supply and the DC power supply circuit in turn, and delays for a certain period of time to maintain the contactor pull-in and not trip;

f. Switch back to the AC power supply - when the delay ends, the single-chip microcomputer controls the normally open contacts J1B and J1C of the electromagnetic relay and the normally open contact J2 of the solid state relay to open, and the normally closed contacts J1A and J1D of the electromagnetic relay are closed to stop the energy storage capacitor group Supply DC to the contactor, switch back to the grid to supply AC to the contactor.

Further, after performing the "status monitoring" and before performing the "shaking power monitoring", a fault self-check is also carried out. If a fault occurs, the delayed "tripping" function will automatically exit, and the contactor will be maintained with alternating current. Pull in, and carry out fault indication.

The beneficial effects of the present invention are:

Through the above-mentioned technical scheme, the present invention can start the contactor with AC power through the power grid, without burning out the device and the contactor, etc., and solves the defects of the pulsating DC starting contactor; The DC/DC power supply realizes the DC power supply of the contactor, keeps the contactor closed, has low cost, small size, and high reliability; in addition, this anti-shaking electric module also uses the action and release time of the solid state relay which are faster than the electromagnetic relay characteristics, which solves the problem of "arcing" on the electromagnetic relay contacts when the electromagnetic relay is released, and often causes the electromagnetic relay contacts to burn out; compared with the principle of the traditional anti-shake electric module, it is more reliable and meets the continuity Requirements for long-term stable operation of the production line.

Description of drawings

Fig. 1 is a schematic block diagram of the structural principle of an embodiment of an anti-shaking electric module using a bypass mode according to the present invention;

FIG. 2 is a flow chart of a control method of an anti-shake module using a bypass mode according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1:

An anti-sway electricity module using a bypass mode described in the embodiment of the present invention is an anti-sway electricity module in an offline mode, including a single-chip microcomputer 1, an electromagnetic relay 2, a solid-state relay 3, an energy storage capacitor group 4, and an AC/DC switch Power supply 5 , DC/DC power supply 6 , voltage conversion chip 7 , AC voltage sampler 8 and state detector 9 . Wherein, the input end and the output end of the AC/DC switching power supply 5 are respectively electrically connected to the power grid 10 and the input end of the energy storage capacitor group 4, and one output end of the energy storage capacitor group 4 is connected to the power supply through the voltage conversion chip 7 and The single-chip microcomputer 1 is electrically connected, and the other output end is electrically connected to the input end of the DC/DC power supply 6; the output end of the DC/DC power supply 6 is electrically connected to the contactor 12 arranged on the grid 10 through the DC power supply circuit 11; The input end and the output end of the AC voltage sampler 8 and the state detector 9 are respectively connected with the power grid 10 and the single-chip microcomputer 1 signal; the output end of the single-chip microcomputer 1 is connected with the electromagnetic relay 2 and the solid state relay 3 signals, and the The normally closed contacts J1A and J1D are set on the grid 10 to connect the grid 10 and the contactor 12 . The specific structure can be: the normally closed contacts J1A, J1D of the electromagnetic relay 2 are respectively arranged on the N line and the L line of the power grid 10; On the N line and L line of the electromagnetic relay 2, and the normally open contact J1B of the electromagnetic relay 2 and the normally open contact J2 of the solid state relay 3 are connected in series with the DC power supply circuit 11 connected to the N line of the power grid 10, and the normally open contact of the electromagnetic relay 2 The contact J1C is connected in series with the DC power supply circuit 11 connected to the L line of the grid 10; the input end of the AC voltage sampler 8 is connected to the N line and the L line in front of the normally closed contact J1A, J1D of the electromagnetic relay 2, so The input end of the state detector 9 is connected to the L line, and is located behind the DC power supply circuit 11 in which the normally open contact J1C of the electromagnetic relay 2 is connected in series.

Wherein, the AC voltage sampler 8 is a transformer; the state detector 9 is mainly composed of two groups of diodes, a DC optocoupler and an AC and DC dual-purpose optocoupler, and the two groups of diodes are connected in reverse parallel, and each A group of diodes is composed of two diodes connected in series, and the DC optocoupler and AC/DC dual-purpose optocoupler are connected in parallel on two groups of diodes; the voltage conversion chip is an LDO power supply chip; the energy storage capacitor group 4 is composed of seven 10F /2.5V supercapacitor connected in series.

The working principle of the anti-sway module using the bypass mode in the present invention is: after power on, press the start button, the grid 10 supplies AC power to start the contactor 12 reliably pulls in, and at this time the AC voltage sampler 8 collects the grid voltage in real time value, and send it to the single-chip microcomputer 1 to judge whether the electric shock occurs; when the electric shock occurs, the single-chip microcomputer 1 controls the normally closed contacts J1A and J1D of the electromagnetic relay 2 to open, and the normally open contacts J1B and J1C of the electromagnetic relay 2 and the normally open contacts of the solid state relay 3 The opening contact J2 is closed, so that the energy storage capacitor group 4 supplies direct current to the contactor 12, so as to maintain the contactor 12 to pull in and not trip; after the delay is over, the single-chip microcomputer 1 controls the normally closed contacts J1A and J1D of the electromagnetic relay 2 to close, Simultaneously open the normally open contact J1B of the electromagnetic relay 2 and the normally open contact J2 of the solid state relay 3 , and switch back to supply AC power to the contactor 12 through the grid 10 . At the same time, the state detector 9 also detects the current information on the L line in real time, and sends it to the single-chip microcomputer 1 to judge the state of the contactor 12 and the mode of maintaining the pull-in state.

In this way, the anti-swaying electric module adopting the bypass mode described in the present invention adopts the alternating current starting contactor 12, and the situations such as burning out the device and the contactor will not occur, and solves the defect that the pulsating DC starting contactor exists; Through the control of the electromagnetic relay 2 and the solid-state relay 3, the DC power supply of the energy storage capacitor group 4 to the contactor 12 is realized, the contactor 12 is kept closed, and the AC power supply of the grid 10 to the contactor 12 is automatically restored after the power is shaken, and the cost is low. Small size, high reliability; and the anti-sway module only works when there is a sway, even if it is damaged, it will not affect the normal opening and closing operation of the contactor 12 (at this time it remains in the AC power supply state of the grid), and will not be affected by The use of the anti-sway module brings new additional fault points; in addition, the anti-sway module also utilizes the characteristics that the action and release time of the solid state relay 3 are faster than the electromagnetic relay 2, which solves the problem of the release of the electromagnetic relay. , the electromagnetic relay contacts will appear "arcing", and the electromagnetic relay contacts will often burn out. Compared with the principle of the traditional anti-shaking module, it is more reliable and meets the long-term stable operation requirements of the continuous production line.

As a preferred solution of the anti-shake module of the present invention, the anti-shake module also includes a voltage monitor 13, which is mainly composed of a Zener diode and a DC optocoupler, and its two ends are connected to the DC/DC power supply 6 and the single-chip microcomputer respectively. 1 signal connection. During operation, the voltage monitor 13 detects the power of the DC/DC power supply 6 in real time, and transmits the power detection data to the single-chip microcomputer 1, and then the single-chip microcomputer 1 judges whether there is a fault in the anti-shaking electric module itself according to the power detection data, and if there is a fault, That is, the anti-shaking function is automatically withdrawn, and the contactor 12 is kept closed by alternating current, without affecting the normal opening and closing of the contactor, and the performance is more reliable.

In addition, the DC power supply circuit 11 is also connected in series with a fuse (not shown in the figure), and the input end of the AC/DC switching power supply 5 is provided with an EMC power filter (not shown in the figure), which effectively improves the resistance The safety and anti-interference ability of the Akimoto module, the performance is more stable.

As shown in Figure 2:

According to the control method of the anti-sway module using the bypass mode described in the embodiment of the present invention, the contactor 12 is started by supplying AC power through the power grid 10 during normal operation, so that the contactor 12 is pulled in and does not trip; During power supply, direct current is supplied through the bypass to keep the contactor 12 sucked in and not tripped. Specifically include the following steps:

Step A. Start - after power on, operate the start button;

Step B. AC power supply—the grid 10 supplies AC power to the contactor 12 through the normally closed contacts J1A and J1D of the electromagnetic relay 2;

Step C. Status monitoring—the status detector 9 detects and judges the status of the contactor 12 in real time and the mode of maintaining the pull-in status;

Step D. Electricity monitoring—the AC voltage sampler 8 collects the input voltage value of the power grid in real time, and judges whether the input voltage meets the electric power criterion requirement;

Step E. Bypass DC power supply—when the shaking power condition is met, the single-chip microcomputer 1 controls the normally closed contacts J1A and J1D of the electromagnetic relay 2 to open, the normally open contacts J1B and J1C of the electromagnetic relay 2 and the normally open contact J2 of the solid state relay 3 to close Finally, the energy storage capacitor group 4 supplies DC power to the contactor 12 through the DC/DC power supply 6 and the DC power supply circuit 11 in turn, and delays for a certain time (the delay time can be set by the user.) to maintain the contactor 12 suction. Closed, not tripped;

Step F. Switch back to the AC power supply—when the delay ends, the single-chip microcomputer 1 controls the normally open contacts J1B, J1C of the electromagnetic relay 2 and the normally open contact J2 of the solid state relay 3 to open, and the normally closed contacts J1A and J1D of the electromagnetic relay 2 are closed. The energy storage capacitor group 4 is stopped to supply DC power to the contactor 12 , and the grid 10 is switched back to supply AC power to the contactor 12 .

In this way, the contactor 12 can be supplied with alternating current and direct current respectively during normal operation and when swaying electricity occurs, so as to realize uninterrupted power supply of the contactor, solve the defect of the pulsating direct current starting contactor, and maintain the contactor 12 to pull in, High reliability, fully meet the requirements of long-term stable operation of the continuous production line.

As a preferred solution of the control method of the present invention, after performing the "status monitoring" and before performing the "shaking power monitoring", a fault self-check is also performed. If a fault occurs, the delayed "tripping" function will automatically exit , and maintain contactor 12 pull-in with alternating current, and carry out fault indication, will not increase any fault point, can satisfy the need of long-term stable operation of the continuous production line more.

The above description is a preferred embodiment of the present invention, and it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (9)

1. an anti-shake electric module that adopts bypass mode, it is characterized in that, include single-chip microcomputer (1), electromagnetic relay (2), solid-state relay (3), energy capacitance set (4), AC/DC Switching Power Supply (5), DC/DC power supply (6), voltage transitions chip (7), alternating voltage sampler (8) and state detector (9); Wherein, the input of described AC/DC Switching Power Supply (5) and output are electrically connected to the input of electrical network (10) and energy capacitance set (4) respectively, the one output of described energy capacitance set (4) is electrically connected to single-chip microcomputer (1) through voltage transitions chip (7), and another output is electrically connected to the input of DC/DC power supply (6); The output of described DC/DC power supply (6) is electrically connected to the contactor (12) being arranged on electrical network (10) by direct current power supply loop (11); The input of described alternating voltage sampler (8) and state detector (9) is connected with single-chip microcomputer (1) signal with electrical network (10) respectively with output; The output of described single-chip microcomputer (1) is connected with solid-state relay (3) signal with electromagnetic relay (2), and it is upper to connect electrical network (10) and contactor (12) that normally closed contact J1A, the J1D of described electromagnetic relay (2) are located at electrical network (10), and the normal opened contact J2 of its normal opened contact J1B, J1C and solid-state relay (3) is connected on direct current power supply loop (11) in the lump.

2. the anti-shake electric module of employing bypass mode according to claim 1, is characterized in that, normally closed contact J1A, the J1D of described electromagnetic relay (2) is located at respectively on the N line and L line of electrical network (10); Described direct current power supply loop (11) is connected to and is positioned on the normally closed contact J1A of electromagnetic relay (2), the N line at J1D rear and L line, and it is upper that the normal opened contact J2 of the normal opened contact J1B of described electromagnetic relay (2) and solid-state relay (3) is connected on the direct current power supply loop (11) being connected with the N line of electrical network (10), and the normal opened contact J1C of described electromagnetic relay (2) is connected on the direct current power supply loop (11) being connected with the L line of electrical network (10); The input of described alternating voltage sampler (8) is connected on the normally closed contact J1A of electromagnetic relay (2), the N line in J1D the place ahead and L line, the input of described state detector (9) is connected on L line, and is positioned at the rear of the direct current power supply loop (11) of the normal opened contact J1C that is in series with electromagnetic relay (2).

3. the anti-shake electric module of employing bypass mode according to claim 1 and 2, is characterized in that, described alternating voltage sampler (8) is instrument transformer; Described state detector (9) is mainly comprised of two groups of diodes, a direct current optocoupler and an AC/DC optocoupler, wherein, described two groups of diodes are anti-also to be connected, and every group of diode is in series by two diodes, and described direct current optocoupler and AC/DC optocoupler are connected in parallel on two groups of diodes.

4. the anti-shake electric module of employing bypass mode according to claim 3, is characterized in that, described voltage transitions chip (7) is LDO power supply chip, and described energy capacitance set (4) is in series by the super capacitor of 7 10F/2.5V.

5. according to the anti-shake electric module of the employing bypass mode described in claim 1 or 2 or 4, it is characterized in that, described anti-shake electric module also includes voltage monitor (13), mainly a Zener diode and direct current optocoupler, consist of, its two ends are connected with single-chip microcomputer (1) signal with DC/DC power supply (6) respectively.

6. according to the anti-shake electric module of the employing bypass mode described in claim 1 or 2 or 4, it is characterized in that, described direct current power supply loop is also in series with fuse on (11), and the input of described AC/DC Switching Power Supply (5) is provided with EMC power-supply filter.

7. a control method that adopts the anti-shake electric module of bypass mode, is characterized in that, when normal operation, by electrical network (10), supplies with alternating current starting contactor (12), makes contactor (12) adhesive, does not thread off; When occurring to shake electricity, by bypass, supplying with direct current maintains contactor (12) adhesive, does not thread off.

8. control method according to claim 7, is characterized in that, specifically includes following steps:

A. after start-energising, operation start button;

B. Alternating Current Power Supply-electrical network (10) is supplied with alternating current through normally closed contact J1A, the J1D of electromagnetic relay (2) to contactor (12);

C. status monitoring-state detector (9) detects, judges the state of contactor (12) and the mode that maintains attracting state in real time;

D. shake pyroelectric monitor-alternating voltage sampler (8) Real-time Collection electrical network input voltage value, and judge whether input voltage meets and shake electric criterion requirement;

E. bypass direct current supply-when meeting the electric condition of rolling, normally closed contact J1A, J1D that single-chip microcomputer (1) is controlled electromagnetic relay (2) open, the normal opened contact J2 of normal opened contact J1B, the J1C of electromagnetic relay (2) and solid-state relay (3) is closed, last energy capacitance set (4) is supplied with direct current through DC/DC power supply (6), direct current power supply loop (11) to contactor (12) successively, and time delay certain hour, to maintain contactor (12) adhesive, not thread off;

F. switchback Alternating Current Power Supply-when time delay finishes, single-chip microcomputer (1) is controlled normal opened contact J1B, the J1C of electromagnetic relay (2) and the normal opened contact J2 of solid-state relay (3) opens, normally closed contact J1A, the J1D of electromagnetic relay (2) are closed, stop energy capacitance set (4) and supply with direct current to contactor (12), switchback electrical network (10) is supplied with alternating current to contactor (12).

9. control method according to claim 8, it is characterized in that, front with execution described " rolling pyroelectric monitor " after carrying out described " status monitoring ", also carry out fault self-checking, if there is fault, time delay " dropout " function exits automatically, and maintains contactor (12) adhesive with alternating current, and carries out faulty indication.

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