CN101826417A - Method and device for controlling low current of relay - Google Patents
Method and device for controlling low current of relay Download PDFInfo
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- CN101826417A CN101826417A CN201010129386A CN201010129386A CN101826417A CN 101826417 A CN101826417 A CN 101826417A CN 201010129386 A CN201010129386 A CN 201010129386A CN 201010129386 A CN201010129386 A CN 201010129386A CN 101826417 A CN101826417 A CN 101826417A
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Abstract
The invention relates to a low current control device of a relay, which comprises a control module, a contact current-sampling module, a relay driving end and a control input end which are connected with the control module, or comprises a relay power-sampling module connected with the control module, or comprises the relay connected with the driving end. The device is characterized in that: the control module also comprises a device for detecting the moment of a minimum current value of a contact current waveform of the relay when a relay disconnecting drive signal appears, and breaking contacts of the relay near a first or n-th periodic moment after the moment of the minimum current value.
Description
Technical field:
The present invention relates to electron controls technology, specifically a kind of low current of relay control method and device thereof.
Background technology:
Electromagnetic relay commonly used is to power up to solenoid to make the armature adhesive, and drives moving contact and fixed contact closure, otherwise then anti-.
General relay is usually used in carrying out the switch relay to exchanging the relay power supply, when relay contact will cause the arc erosion of contact easily when big electric current carries out switch motion, and cause bigger electromagnetism wave amplitude blackberry lily to disturb, electric equipment is damaged because of big impulse current, and this is that present relay uses the problem that exists.
One of solution is proposed by following patent documentation in the prior art: Chinese patent application number is 200910053005.X, and name is called: method of zero passage switch of electromagnetic relay and circuit.Whether the deficiency of this technical scheme is will be that the relay power supply wave shape is checked and carry out error correction zero point to relay-operating time point all at every turn, and when relay disconnects in addition preferably constantly is not zero alternating current pressure point, but the minimum current point.
Summary of the invention:
The purpose of this invention is to provide a kind of low current of relay control method and device thereof.
The present invention adopts following technical scheme, see Fig. 1, a kind of low current of relay control device, comprise control module, comprise the contact current sampling module and the relay drive end that are connected with described control module, the control input end, or comprise the relay power supply sampling module that is connected with described control module again, or comprise the relay that connects drive end again, it is characterized in that described control module also is included in the minimum current value that detects the relay contact current waveform when relay disconnection drive signal occurs and (contains absolute value, down with) constantly, (be generally 2 to 100 at described minimum current value after constantly the 1st or n, down together) the individual cycle disconnects the device of relay contact constantly.
Described a kind of low current of relay control device, it is characterized in that described control device also comprises has preestablished the difference between current threshold value, and the current value that detects described relay contact is also temporary, disconnect relay contact when the electric current of described relay contact and the electric current difference in the preceding corresponding moment in 1 cycle are less than described difference between current threshold value before will cut off the power supply, and restart to detect the device in the described minimum current value moment during greater than described difference between current threshold value in described electric current difference.
Described a kind of low current of relay control device, it is characterized in that described control module also is included in minimum voltage value (contain absolute value, down with) that the adhesive drive signal detects power supply wave shape when occurring constantly, near the device of closing relay contact described minimum voltage value after constantly the 1st or n moment in cycle.
Described a kind of low current of relay control device, it is characterized in that described control module also comprises has preestablished that relay powers up in advance or the power-off time value, when relay switch is operated, the device that described relay control device powered up or cuts off the power supply described relay in advance according to relay actuation time.
Described a kind of low current of relay control device is characterized in that program circuit (as shown in Figure 3) function that described control module comprises is:
Function A. detects the relay contact current waveform when disconnecting drive signal and occur minimum current value constantly, the moment disconnects relay contact near described minimum current value after constantly the 1st or n cycle.
Function B. has preestablished the difference between current threshold value, the current value that detects described relay contact is also temporary, disconnect relay contact when the electric current of described relay contact and the electric current difference in the preceding corresponding moment in 1 cycle are less than described difference between current threshold value before will cut off the power supply and operate, and re-execute function A during greater than described difference between current threshold value in described electric current difference.
Function C. detects power supply wave shape when the adhesive drive signal occurs minimum voltage value constantly, near the device of closing relay contact described minimum voltage value after constantly the 1st or n moment in cycle.
Function D. has preestablished that relay powers up in advance or the power-off time value, when relay switch is operated, and the device that described relay control device powered up or cuts off the power supply described relay in advance according to relay actuation time.
Close to do the explanation of function D: with minimum voltage value or minimum current value is benchmark constantly, the power cycle T time is deducted power up in advance or after power-off time (for example 20mS-5mS=15mS) carries out timing, relay is powered up or power operation in advance.
A kind of low current of relay control method, one relay control device is provided, described relay control device can detect the current waveform of relay switch contacts, or can detect relay power source voltage waveform again, comprise the relay that connects described relay drive end again, it is characterized in that may further comprise the steps:
A. the 1st behind the minimum current value at power supply or n cycle disconnect relay contact constantly when the disconnection drive signal occurs.
Described a kind of low current of relay control method is characterized in that further comprising the steps of:
B. preestablished the difference between current threshold value, detect the current value of described relay contact and temporary, then will return again when differing by more than described electric current difference threshold and carry out the A step when the electric current that detects described relay contact before the outage and with the current value in the preceding corresponding moment in 1 cycle.
Step B is used for load current burst changed and detects once more, and the minimum current value that detects relay contact when big load current takes place again is more conducive to the protection relay contact constantly like this, and the difference between current threshold value is chosen as about 50mA to 200mA.
Described a kind of low current of relay control device is characterized in that described difference between current threshold value is 50mA to 200mA.
Described a kind of low current of relay control method is characterized in that may further comprise the steps:
C. when the adhesive drive signal occurs the minimum voltage value of relay power supply after constantly the 1st or n cycle constantly near the step of closing relay contact.
Described a kind of low current of relay control method is characterized in that in the steps A further comprising the steps of again:
D. preestablished relay and shifted to an earlier date the power-off time value, when relay was closed operation, described relay control device was according in advance described relay being cut off the power supply relay actuation time.
Described a kind of low current of relay control method is characterized in that among the step C further comprising the steps of again:
E. preestablished relay and powered up time value in advance, during to the relay ON operation, described relay control device is according in advance described relay being powered up relay actuation time.
The advantage of technical scheme of the present invention is the arc erosion that obviously reduced relay contact, reduce electromagnetism wave amplitude blackberry lily that spark causes disturbs and helps prolonging electric equipment useful life; Another advantage of technical scheme of the present invention is to can be used for DC power supply or 3 cross streams power supplys.
Description of drawings
Fig. 1 is the low current of relay control device structural representation of the single-phase or DC power supply of the present invention;
Fig. 2 is the low current of relay control device structural representation of the present invention's 3 phase power supplys;
Fig. 3 is a control module software program flow chart of the present invention.
Embodiment:
Below in conjunction with accompanying drawing the present invention is described in further details.
A kind of low current of relay control device is characterized in that described control module also comprises the device that detects and store automatically according to the time value that powers up in advance relay actuation time and cut off the power supply.
Relay of the present invention disconnects and being operate time time difference that electromagnetic coil relay is powered down to the contact disconnection; Relay closes of the present invention is electromagnetic coil relay operate time and powers up time difference to the closing of contact.Its closed action time of same relay is normally inequality operate time with disconnection, again in order to solve each relay actuation time of mutually different problem, can control module test automatically operate time in the relay control device production process or behind the relay that more renews, and closure/disconnection value operate time all is stored in is provided with the back in the control module and uses the closure/disconnection of relay.
The ac power frequency of relay control device switch of the present invention is generally 50Hz to 400Hz, and its voltage and load current waveform all have the identical cycle, and relay control device of the present invention can detect automatically to the AC power cycle; Relay control device of the present invention also can be used for the switch of DC power supply.
Relay contact minimum current of the present invention detects constantly: promptly in the minimum value of a power cycle range detection contact load current and go out now.The contact load current is detected and can detect in the several power cycle scopes before and after relay closes the drive signal appearance.
Power supply minimum voltage of the present invention detects constantly: promptly detect the minimum value of supply voltage and go out now in a power cycle.Supply voltage is detected and can open several power cycle range detection that front and back appear in drive signal at relay.
If can obtain fastest response speed when being set near constantly closure of minimum voltage/current value back 1 cycle constantly or disconnected relay switch contacts in the technical solution of the present invention.Be that the moment of emphasizing closure or disconnection relay contact, constantly neighbouring (for example 0-2mS) also filled perhaps as long as deviation is no more than ideal near the described moment in cycle.
Low current of relay control device structure is described as follows:
1. the supply voltage sampling module is used for sampling detection power supply wave shape, and the simplest mode is to add A/D function IC with the sampling of voltage divider resistance to form.
2. the contact current sampling module is used for sampling detection contact current waveform, and the simplest mode is to add A/D function IC with current sampling resistor to form.
3. described control module can be made of monolithic computer, and its computer software programs that include are realized the timer counter function of described control module function and relay actuation time.Also can include A/D by monolithic or embedded computer realizes detecting mains voltage waveform and detects the contact current waveform.The monolithic computer holder stores and powers up or the power-off time value, also stored current difference threshold value.
4. described control module also can be made of the ASIC circuit, and its application-specific integrated circuit (ASIC) that includes is used to realize the timer counter function of described control module function and relay actuation time.Also can include A/D by ASIC realizes detecting mains voltage waveform and detects the contact current waveform.
5. the relay drive end is used to connect relay.
6. the control input end is used for accepting to the relay switch command signal, and can be used as the instruction input port that the closure of relay/disconnection is tested operate time automatically.
When low current of relay control method of the present invention is used for the relay of three-phase alternating-current supply, the most direct mode is to be used in combination with three low current of relay control device, be about to three control input end parallel connections, 3 relay contacts are controlled 3 power supply phase lines respectively and are got final product.Or connect 3 supply voltage sampling modules respectively with a control module (also can be only with 1 supply voltage sampling module for industrial three phase sine power supply, other 2 phase voltage waveforms can be calculated and obtain) and 3 current sample modules, 1 relay drive end, 1 control input end form, see Fig. 3 for details.
A kind of low current of relay control device is characterized in that described control module comprises that 1 supply voltage sampling module and 3 current sample modules, 1 relay drive end, 1 control input end form; Or described relay drive end is connected with relay.
Claims (10)
1. low current of relay control method, one relay control device is provided, described relay control device can detect the current waveform of relay switch contacts, or can detect relay power source voltage waveform again, comprise the relay that connects described relay drive end again, it is characterized in that may further comprise the steps:
A. the 1st behind the minimum current value at power supply or n cycle disconnect relay contact constantly when the disconnection drive signal occurs.
2. according to the described a kind of low current of relay control method of claim 1, it is characterized in that further comprising the steps of:
B. preestablished the difference between current threshold value, detect the current value of described relay contact and temporary, then will return again when differing by more than described electric current difference threshold and carry out the A step when the electric current that detects described relay contact before the outage and with the current value in the preceding corresponding moment in 1 cycle.
3. according to the described a kind of low current of relay control method of claim 1, it is characterized in that further comprising the steps of:
C. when the adhesive drive signal occurs the minimum voltage value of relay power supply after constantly the 1st or n cycle constantly near the step of closing relay contact.
4. according to the described a kind of low current of relay control method of claim 1, it is characterized in that in the steps A further comprising the steps of again:
D. preestablished relay and shifted to an earlier date the power-off time value, when relay was closed operation, described relay control device was according in advance described relay being cut off the power supply relay actuation time.
5. according to right 3 described a kind of low current of relay control methods, it is characterized in that among the step C further comprising the steps of again:
E. preestablished relay and powered up time value in advance, during to the relay ON operation, described relay control device is according in advance described relay being powered up relay actuation time.
6. low current of relay control device, comprise control module, comprise the contact current sampling module that is connected with described control module and relay drive end, control input end or comprise not only the relay power supply sampling module that is connected with described control module or but also comprise the relay that connects drive end, it is characterized in that described control module also be included in detect the relay contact current waveform when relay disconnects drive signal and occurs minimum current value constantly, described minimum current value after constantly the 1st or n cycle constantly near the device of disconnection relay contact.
7. according to the described a kind of low current of relay control device of claim 6, it is characterized in that described control device also comprises has preestablished the difference between current threshold value, and the current value that detects described relay contact is also temporary, disconnect relay contact when the electric current of described relay contact and the electric current difference in the preceding corresponding moment in 1 cycle are less than described difference between current threshold value before will cut off the power supply, and restart to detect the device in the described minimum current value moment during greater than described difference between current threshold value in described electric current difference.
8. according to the described a kind of low current of relay control device of claim 7, it is characterized in that described difference between current threshold value is 50mA to 200mA.
9. according to the described a kind of low current of relay control device of claim 6, it is characterized in that described control module also is included in minimum voltage value (contain absolute value, down with) that the adhesive drive signal detects power supply wave shape when occurring constantly, near the device of closing relay contact described minimum voltage value after constantly the 1st or n moment in cycle.
10. according to claim 6 or 9 described a kind of low current of relay control device, it is characterized in that described control module also comprises has preestablished that relay powers up in advance or the power-off time value, when relay switch is operated, the device that described relay control device powered up or cuts off the power supply described relay in advance according to relay actuation time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010129386A CN101826417A (en) | 2009-12-17 | 2010-02-16 | Method and device for controlling low current of relay |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910265554.3 | 2009-12-17 | ||
| CN201010129386A CN101826417A (en) | 2009-12-17 | 2010-02-16 | Method and device for controlling low current of relay |
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| CN101826417A true CN101826417A (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010129386A Pending CN101826417A (en) | 2009-12-17 | 2010-02-16 | Method and device for controlling low current of relay |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887822A (en) * | 2010-07-16 | 2010-11-17 | 韩燕� | Relay small-voltage control device and method |
| CN103943386A (en) * | 2013-01-18 | 2014-07-23 | 珠海市伏安达电子科技有限公司 | Controllable switch and control method thereof |
| CN108549258A (en) * | 2018-03-23 | 2018-09-18 | 高湍斌 | The time relay and its control method for multi-channel control |
| CN108681265A (en) * | 2018-03-23 | 2018-10-19 | 高湍斌 | The time relay and its control method |
| CN111725025A (en) * | 2020-05-28 | 2020-09-29 | 叶锦堂 | Relay zero-crossing switch correction method, detection correction circuit and controller |
-
2010
- 2010-02-16 CN CN201010129386A patent/CN101826417A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887822A (en) * | 2010-07-16 | 2010-11-17 | 韩燕� | Relay small-voltage control device and method |
| CN103943386A (en) * | 2013-01-18 | 2014-07-23 | 珠海市伏安达电子科技有限公司 | Controllable switch and control method thereof |
| CN103943386B (en) * | 2013-01-18 | 2016-04-06 | 珠海市伏安达电子科技有限公司 | Gate-controlled switch and control method thereof |
| CN108549258A (en) * | 2018-03-23 | 2018-09-18 | 高湍斌 | The time relay and its control method for multi-channel control |
| CN108681265A (en) * | 2018-03-23 | 2018-10-19 | 高湍斌 | The time relay and its control method |
| CN111725025A (en) * | 2020-05-28 | 2020-09-29 | 叶锦堂 | Relay zero-crossing switch correction method, detection correction circuit and controller |
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Application publication date: 20100908 |