CN101720143A - Zero crossing point control method of relaying protection device - Google Patents
Zero crossing point control method of relaying protection device Download PDFInfo
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- CN101720143A CN101720143A CN200910185824A CN200910185824A CN101720143A CN 101720143 A CN101720143 A CN 101720143A CN 200910185824 A CN200910185824 A CN 200910185824A CN 200910185824 A CN200910185824 A CN 200910185824A CN 101720143 A CN101720143 A CN 101720143A
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Abstract
The invention relates to a zero crossing point (ZCP) control method of a relay, which comprises the following steps of: receiving zero crossing time output by a zero crossing detection circuit in real time by a main control chip, and after the main control chip receives a drive signal for driving the relay to act, entering in a zero crossing delay program; and (2) timing by an internal timer of the main control chip, and when a time timed by the timer is equal to a zero crossing time, outputting a control signal by the main control chip to the relay for driving the relay to act. The invention detects the zero crossing time reaching a zero crossing phase in real time though the zero crossing detection circuit; when a load connected with the relay needs to be controlled, the main control chip conducts time delay through the timer inside; and when the time timed by the timer reaches the zero crossing time, the main control chip outputs the control signal to the relay to control the switching on/off of contacts at the zero crossing point. The invention can reduce the interference generated when the load is switched on or off and prolong the service life of the relay at the same time.
Description
Technical field
The present invention relates to the microwave oven technical field, particularly a kind of zero crossing point control method of relaying protection.
Technical background
In the microwave oven control technology, one of control procedure of most critical is to high power load--the control of-high-tension transformer, in the moment of transformer disconnection and conducting, because the rate of change of electric current is very big, can produce very strong induced electromotive force, this high voltage is superimposed upon on the electrical network, interferes with the operate as normal of main control chip again by power supply, so the interference of adopting the zero crossing control mode to reduce that transformer disconnects usually and producing during conducting.
The method of existing known disturbances has, and in the elementary increase capacitance-resistance of transformer, the advantage of this method is effectively to reduce the existence of interference, and shortcoming is that parameter is difficult to determine that the claimed parameter of different inductive loads can change thereupon.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high power load that can effectively suppress at the zero crossing point control method of relaying protection that disconnects and conducting moment generation is disturbed.
The control method of relay zero-crossing point, this method comprises the step of following order:
(1) main control chip receives the zero-crossing timing of zero cross detection circuit output in real time, receive the drive signal that drives the actuating of relay when main control chip after, enter the zero passage delay procedure;
(2) main control chip timer internal timing, when the timer timing time equals zero crossing during the time, main control chip outputs control signals to relay, drives the actuating of relay.
The input of described main control chip is taken over the output of zero testing circuit, and the output of described main control chip is connected with load by relay, and main control chip inside is provided with timer and register.
Described zero-crossing timing is meant that the current phase place of alternating current voltage, electric current arrives the needed time of phase place at zero point.
Described timer produces once every 1ms and interrupts, the number of times that timer interrupts is stored in the register of main control chip, register memory contains the parameter value of setting, this parameter value is corresponding with timing, when the number of times of timer interruption reaches the parameter value of setting, enter the relay driver, main control chip drives relay disconnection or closed.
Described timing is 5ms, and described parameter value is 5.
The present invention compared with prior art, the present invention detects the zero-crossing timing that arrives the zero passage phase place in real time by zero cross detection circuit, in the time need controlling for the load that relay links to each other, main control chip is delayed time by its inner timer, the time of timer timing is when reaching zero-crossing timing, main control chip outputs control signals to relay, controls its contact and disconnects or adhesive in zero crossing.The present invention can reduce the interference phenomenon that produces when loading on disconnection or closure, the useful life that can improve relay simultaneously.
Description of drawings
Fig. 1 is a circuit diagram of the present invention;
Fig. 2 is a workflow diagram of the present invention.
Embodiment
A kind of zero crossing point control method of relaying protection, as shown in Figure 1, 2, this method comprises the step of following order: the first, and main control chip 1 receives the zero-crossing timing of zero cross detection circuit 2 outputs in real time, receive the drive signal of driving relay K action when main control chip 1 after, enter the zero passage delay procedure; The second, main control chip 1 timer internal timing, when the timer timing time equals zero crossing during the time, main control chip 1 outputs control signals to relay K, drives the relay K action.Described zero-crossing timing is meant that the current phase place of alternating current voltage, electric current arrives the needed time of phase place at zero point.
The input of described main control chip 1 is taken over the output of zero testing circuit 2, and the output of described main control chip 1 is connected with load 3 by relay K, and main control chip 1 inside is provided with timer and register.After entering the zero passage delay procedure, timer produces once every 1ms and interrupts, the number of times that timer interrupts is stored in the register of main control chip 1, register memory contains the parameter value of setting, this parameter value is corresponding with timing, when the number of times of timer interruption reaches the parameter value of setting, enters the driver of relay K, main control chip 1 drives relay K disconnection or closed, as shown in Figure 1, 2.Suppose that timing is 5ms, the parameter value of the setting of register memory storage is 5 so, timer produces once every 1ms and interrupts, when interrupting once more, the interruption times of register-stored adds 1, when timer interrupts for the 5th time, the interruption times of register-stored equals 5, at this moment, the voltage of alternating current or electric current arrive zero phase, and main control chip 1 drives the relay K action, its contact are disconnected or closure, the load that is connected with relay K with assurance is to disconnect or closure at zero crossing, thereby has avoided the existence of interference phenomenon.
Because great majority control is inductive load, there are phase difference in its electric current and voltage, measure its phase difference usually, and this phase difference are added in the delay time of timer, to accomplish the zero crossing control of electric current.The present invention is not only applicable to inductive load, is equally applicable to resistive load, prolongs the life-span of relay K.
Claims (5)
1. zero crossing point control method of relaying protection, this method comprises the step of following order:
(1) main control chip receives the zero-crossing timing of zero cross detection circuit output in real time, receive the drive signal that drives the actuating of relay when main control chip after, enter the zero passage delay procedure;
(2) main control chip timer internal timing, when the timer timing time equals zero crossing during the time, main control chip outputs control signals to relay, drives the actuating of relay.
2. zero crossing point control method of relaying protection according to claim 1, it is characterized in that: the input of described main control chip is taken over the output of zero testing circuit, the output of described main control chip is connected with load by relay, and main control chip inside is provided with timer and register.
3. zero crossing point control method of relaying protection according to claim 1 and 2 is characterized in that: described zero-crossing timing is meant that the current phase place of alternating current voltage, electric current arrives the needed time of phase place at zero point.
4. zero crossing point control method of relaying protection according to claim 1 and 2, it is characterized in that: described timer produces once every 1ms and interrupts, the number of times that timer interrupts is stored in the register of main control chip, register memory contains the parameter value of setting, this parameter value is corresponding with timing, when the number of times of timer interruption reaches the parameter value of setting, enter the relay driver, main control chip drives relay disconnection or closed.
5. zero crossing point control method of relaying protection according to claim 4 is characterized in that: described timing is 5ms, and described parameter value is 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910185824A CN101720143A (en) | 2009-12-04 | 2009-12-04 | Zero crossing point control method of relaying protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910185824A CN101720143A (en) | 2009-12-04 | 2009-12-04 | Zero crossing point control method of relaying protection device |
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| Publication Number | Publication Date |
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| CN101720143A true CN101720143A (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910185824A Pending CN101720143A (en) | 2009-12-04 | 2009-12-04 | Zero crossing point control method of relaying protection device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313307A (en) * | 2011-09-13 | 2012-01-11 | 深圳麦格米特电气股份有限公司 | Method of switching power for variable frequency microwave oven |
| CN104950717A (en) * | 2015-06-12 | 2015-09-30 | 九阳股份有限公司 | Low-interference food processor control method |
| CN104977528A (en) * | 2014-04-11 | 2015-10-14 | 华北电力大学 | Magnetic latching relay actuation time and reset time detection device |
| CN105517219A (en) * | 2015-12-29 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Control method and device of microwave oven circuit and microwave oven |
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
| CN106211391A (en) * | 2015-04-29 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control apparatus and method |
| CN109509679A (en) * | 2018-11-30 | 2019-03-22 | 上海五零盛同信息科技有限公司 | Relay control system based on zero crossing delays time to control |
| CN109799384A (en) * | 2017-11-16 | 2019-05-24 | 佛山市顺德区美的电热电器制造有限公司 | Voltage zero-cross detection method, device and cooking appliance |
-
2009
- 2009-12-04 CN CN200910185824A patent/CN101720143A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313307B (en) * | 2011-09-13 | 2014-07-09 | 深圳麦格米特电气股份有限公司 | Method of switching power for variable frequency microwave oven |
| CN102313307A (en) * | 2011-09-13 | 2012-01-11 | 深圳麦格米特电气股份有限公司 | Method of switching power for variable frequency microwave oven |
| CN104977528A (en) * | 2014-04-11 | 2015-10-14 | 华北电力大学 | Magnetic latching relay actuation time and reset time detection device |
| CN106211391A (en) * | 2015-04-29 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control apparatus and method |
| CN106211391B (en) * | 2015-04-29 | 2023-01-13 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and zero-crossing switching-on control device and method of switching tube of electromagnetic heating system |
| CN104950717A (en) * | 2015-06-12 | 2015-09-30 | 九阳股份有限公司 | Low-interference food processor control method |
| CN105517219A (en) * | 2015-12-29 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Control method and device of microwave oven circuit and microwave oven |
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
| CN105578637B (en) * | 2015-12-29 | 2018-06-19 | 广东美的厨房电器制造有限公司 | Control method, control device and the micro-wave oven of microwave oven circuit |
| CN105517219B (en) * | 2015-12-29 | 2018-09-04 | 广东美的厨房电器制造有限公司 | Control method, control device and the micro-wave oven of microwave oven circuit |
| CN109799384A (en) * | 2017-11-16 | 2019-05-24 | 佛山市顺德区美的电热电器制造有限公司 | Voltage zero-cross detection method, device and cooking appliance |
| CN109799384B (en) * | 2017-11-16 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Voltage zero-crossing detection method and device and cooking appliance |
| CN109509679A (en) * | 2018-11-30 | 2019-03-22 | 上海五零盛同信息科技有限公司 | Relay control system based on zero crossing delays time to control |
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Open date: 20100602 |