CN107591282B - Control device and method for relay coil - Google Patents
Control device and method for relay coil Download PDFInfo
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- CN107591282B CN107591282B CN201710748539.9A CN201710748539A CN107591282B CN 107591282 B CN107591282 B CN 107591282B CN 201710748539 A CN201710748539 A CN 201710748539A CN 107591282 B CN107591282 B CN 107591282B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
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Abstract
本发明提供一种继电器线圈的控制装置和方法。所述控制装置包括：吸合确认电路、电压反馈电路以及控制单元；所述吸合确认电路用于检测继电器主回路的触点间电压，并输出继电器是否吸合的确认信号；电压反馈电路用于根据该确认信号向所述控制单元提供反馈信号；以及控制单元，用于根据该反馈信号控制所述继电器线圈两端的电压，使得在所述继电器未吸合时将继电器线圈两端的电压设置为第一电压，并在继电器吸合时将继电器线圈两端的电压设置为低于第一电压的第二电压。本发明中的控制装置可使得继电器能够更加可靠的运行并延长其使用寿命，并同时降低了密闭电器盒内热聚集效应，提高电器盒内其他电子元器件使用寿命。
The present invention provides a control device and method for a relay coil. The control device includes: an energizing confirmation circuit, a voltage feedback circuit, and a control unit; the energizing confirmation circuit is used to detect the voltage between the contacts of the relay main circuit and output a confirmation signal indicating whether the relay is energized; the voltage feedback circuit is used to provide a feedback signal to the control unit based on the confirmation signal; and a control unit is used to control the voltage across the relay coil based on the feedback signal, so that when the relay is not energized, the voltage across the relay coil is set to a first voltage, and when the relay is energized, the voltage across the relay coil is set to a second voltage lower than the first voltage. The control device of the present invention can enable the relay to operate more reliably and extend its service life, while reducing the heat accumulation effect in a sealed electrical box and increasing the service life of other electronic components in the electrical box.
Description
Technical field
The present invention relates to electronic circuit fields, and in particular to a kind of control device and method of relay coil.
Background technique
Relay is widely used as a kind of basic electrical action component in power industry.It can pass through contact
State, control opening and being closed for breaker, reach the safety of protection circuit and power load.Therefore, relay it is accurate, can
It is acted by ground particularly important.The relay of actual use influences it often due to the fever of its Inside coil leads to the lost of life
The reliability of movement.Therefore whole system reliability service and protection can be made by reducing relay fever.It is therefore desirable to provide one
Kind can control the coil heating of relay so that relay reliability service scheme.
Summary of the invention
In view of this, the present invention provides a kind of control device and method of relay coil.It can prevent relay coil
It generates heat excessive, influences the reliability of its service life and movement.Moreover can prevent popular drama collection from causing closed electrical appliance kit
The damage of the service life and safety of interior other elements.
According to the first aspect of the invention, a kind of control device of relay coil is provided, comprising:
It is attracted confirmation circuit, voltage feedback circuit and control unit；
Voltage between the contact that confirmation circuit is attracted for detecting relay major loop, and whether output relay is attracted
Confirmation signal；
Voltage feedback circuit is used to provide feedback signal, the Voltage Feedback to described control unit according to the confirmation signal
Circuit includes:
Triode, base stage connection is attracted the output end of confirmation circuit, for receiving the confirmation signal；
First resistor, the positive voltage input terminal and the triode of one end connection relay coil of the first resistor
Collector；
Second resistance, one end of the second resistance connect the other end of the first resistor, the other end of the second resistance
Connect the negative voltage input terminal of the relay coil；And
3rd resistor, one end of the 3rd resistor connect the emitter of the triode；
Wherein, the other end of the first resistor, described one end of the second resistance and the 3rd resistor
The other end be connected to the feedback signal receiving end of described control unit；
And
Control unit, for controlling the voltage at the relay coil both ends according to the feedback signal so that it is described after
First voltage is set by the voltage at relay coil both ends when electric appliance is not attracted, and when relay is attracted by relay coil
The voltage at both ends is set below the second voltage of first voltage.
Preferably, the first voltage is 70% or more of relay voltage rating, preferably 80% or more, described second
Voltage be relay voltage rating 40%-60%, preferably 50%.
Preferably, the first voltage is 80% or more of relay voltage rating.
Preferably, if voltage between the contact contacted with armature the voltage between contact；
The actuation confirmation circuit detects voltage between the contact, and the volume of major loop whether is equal to according to voltage between the contact
Constant voltage judges whether relay is attracted.
Preferably, if voltage is consistent with the voltage rating of the major loop between the contact, the actuation confirms circuit
Judge that relay is not attracted；If the voltage rating of voltage and the major loop is inconsistent between the contact, the actuation confirmation
Circuit judges relay is attracted.
Preferably, if judging, relay is not attracted, and the actuation confirmation circuit output is as the low of the confirmation signal
Level；And if judge that relay is attracted, it is described to be attracted high level of the confirmation circuit output as the confirmation signal.
Preferably, if judging, relay is not attracted, and the actuation confirmation signal output is as the low of the confirmation signal
Level；
The base stage of the triode receives the low level confirmation signal, and the triode is not turned on, then basis
Following formula sets the resistance value of the first, second resistance, so that the voltage at coil both ends is set to first voltage by control unit, so that
Relay is attracted；
Vout/ (R1+R2)=Vsense/R2；
Wherein, Vout is relay coil positive voltage input terminal voltage, and R1, R2 are respectively first resistor and second resistance
Resistance value and Vsense are the setting voltage of control unit feedback signal receiving end.
Preferably, if judging, relay is attracted, and is attracted high level of the confirmation circuit output as the confirmation signal；
The resistance value of 3rd resistor is then set according to the following formula, so that the voltage at coil both ends is set to the second electricity by control unit
Pressure, so that relay maintains attracting state；
Vout/ ((R1//R3)+R2)=Vsense/R2
Wherein, R3 is the resistance value of 3rd resistor.
Preferably, described control unit is PWM Switching Power Supply.
According to the second aspect of the invention, a kind of control method of relay coil is provided, comprising:
It is attracted verification step, detects voltage between the contact of relay major loop, and the confirmation whether output relay is attracted
Signal；
Voltage Feedback step generates feedback signal according to the confirmation signal；And
Voltage rate-determining steps, according to the voltage at the feedback signal regulating relay coil both ends, so that in the relay
First voltage is set by the voltage at relay coil both ends when not being attracted, and when relay is attracted by relay coil both ends
Voltage be set below the second voltage of first voltage.
Preferably, the first voltage is 70% or more of relay voltage rating, preferably 80% or more, described second
Voltage be relay voltage rating 40%-60%, preferably 50%.
Above scheme according to the present invention, by making relay with high voltage (for example, 80% or more of voltage rating)
It after actuation, then reduces coil voltage (50% of voltage rating) and keeps attracting state, realize the damage of DC low-voltage control relay
Consumption declines to a great extent, to achieve the purpose that reduce fever, so that operation that relay can be relatively reliable and extending it and making
Use the service life.And heat accumulation effect in closed electrical appliance kit is reduced simultaneously, improve other electronic component service lifes in electrical appliance kit.
Further detailed description is done to technical solution of the present invention below in conjunction with the drawings and the specific embodiments, the present invention
Beneficial effect will be further appreciated.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, is used for
It explains the present invention, does not constitute improper limitations of the present invention.
Fig. 1 shows the block diagram of the control device of relay coil according to one preferred embodiment of the present invention.
Fig. 2 shows the control device physical circuit of relay coil according to one preferred embodiment of the present invention compositions.
Fig. 3 shows the flow chart of the control method of relay coil according to one preferred embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Fig. 1, Fig. 2 is combined to illustrate the control device of relay coil of the invention first.Fig. 1 shows according to the present invention one
The block diagram of the control device of the relay coil of preferred embodiment.The relay includes coil, contact and armature, the touching
Point and armature are closed when coil is powered, disconnection when being not powered on.As shown in Figure 1, the control device of the relay coil is used for
The voltage at the both ends of the coil of relay RL is controlled, the control device of the relay coil includes being attracted to confirm that circuit 1, voltage are anti-
Current feed circuit 2 and control unit 3.Voltage between the contact that confirmation circuit 1 is attracted for detecting relay major loop, and export
The confirmation signal whether relay is attracted；Voltage feedback circuit 2 provides feedback signal to control unit according to the confirmation signal；With
And control unit 3, the voltage at the relay coil both ends is controlled according to the feedback signal, so that not being attracted in the relay
When by the voltage at relay coil both ends set first voltage, and when relay is attracted by the voltage at relay coil both ends
It is set below the second voltage of first voltage.Wherein, first voltage is 70% or more of relay voltage rating, it is preferred that
80% or more, second voltage is about the 50% of relay voltage rating.Specifically, if between the contact contacted with armature, i.e.,
A, the voltage U between contact of the voltage between BAB, actuation confirmation circuit 1 detects voltage U between the contactAB, judge the contact
Between voltage UABWhether be equal to major loop (power grid) voltage rating, if between the contact voltage and the major loop voltage rating
Unanimously, then relay is not attracted；Conversely, if the voltage rating of voltage and the major loop is inconsistent between the contact, relay
Device is attracted.
Above scheme according to the present invention, by making relay with high voltage (for example, 80% or more of voltage rating)
It after actuation, then reduces coil voltage (50% of voltage rating) and keeps attracting state, realize the damage of DC low-voltage control relay
Consumption declines to a great extent, to achieve the purpose that reduce fever, so that operation that relay can be relatively reliable and extending it and making
Use the service life.And heat accumulation effect in closed electrical appliance kit is reduced simultaneously, improve other electronic component service lifes in electrical appliance kit.
Fig. 2 shows the control device physical circuit of relay coil according to one preferred embodiment of the present invention compositions.Such as
Shown in Fig. 2, it is different from the control method that traditional relay coil is directly accessed voltage rating as defined in specifications, in the present invention
The voltage at relay coil both ends be it is adjustable, will be specifically described below.
It is utilized as shown in Fig. 2, being attracted confirmation circuit 1, such as the voltage acquisition module of integrated transporting discharging unit acquires A, B two o'clock
Between voltage, i.e., voltage U between the described contactAB, by input parameter, the feedback parameter etc. that the amplifier unit is arranged, so that
Such as high level is exported when relay actuation, low level is exported when not being attracted, judges whether relay is attracted really to export
Recognize signal.Specifically, judge voltage U between the contactABIt is whether consistent with the voltage rating of the major loop of setting.If the contact
Between voltage it is consistent with the voltage rating of the major loop, then the confirmation signal that output relay is not attracted, for example, low level；Instead
It, is if the voltage rating of voltage and the major loop is inconsistent between the contact, the confirmation signal that output relay is attracted, example
For example high level.
The voltage feedback circuit 2, as shown in Fig. 2, preferably including: triode Q1, base stage connection are attracted confirmation circuit
Output end, for receiving the confirmation signal；First resistor R1, one end connect positive voltage input terminal and the institute of relay coil
State the collector of triode Q1；Second resistance R2, one end connect the other end of the first resistor R1, and second resistance R2's is another
End connects the negative voltage input terminal (ground connection) of the relay coil；And 3rd resistor R3, the hair of one end connecting triode Q1
Emitter-base bandgap grading.The other end of the other end of first resistor R1, described one end of second resistance R2 and 3rd resistor R3 is connected to
The feedback signal receiving end Vsense of control unit 3.
Described control unit 3 is specifically, for example, PWM step-down switching power supply chip, can the received feedback signal of institute,
When determining relay and not being attracted, it is attracted condition according to relay, by the positive voltage input terminal voltage of relay coil
Vout voltage is set as 80% or more of relay voltage rating, in the solution of the present invention, preferred as 20V, with guarantee after
Electric appliance can be reliably attracted.Relay is realized to using control unit 3, voltage feedback circuit 2 and actuation confirmation circuit 1 below
The specific implementation process of the control of the voltage at coil both ends is described.
Firstly, being attracted confirmation circuit 1 is judging UABWhen consistent with major loop voltage rating, judge that relay is not attracted, then
Export the low level as the confirmation signal.The base stage of triode Q1 receives the low level confirmation signal at this time, and three
Pole pipe Q1 is not turned on, so that there are following relationships:
Vout/ (R1+R2)=Vsense/R2
The voltage that PWM switching power source chip itself designs Vsense is 0.8V or so, sets the resistance value of R2 at this time to be a certain
Fixed value sets Vout as 20V, then can calculate R1 resistance value, according to the resistance match circuit calculated, then PWM
Switching power source chip can automatically adjust output voltage Vout to maintain Vsense voltage for 0.8V or so, while ensure the above pass
It is that formula is set up, Vout will maintain 20V or so.
On the other hand, if being attracted confirmation circuit 1 judges UABIt is inconsistent with major loop voltage rating, then judge that relay is inhaled
It closes, to export the high level as the confirmation signal.The condition that voltage is kept after being attracted according to relay, by Vout voltage
It is set as 50% or so of relay voltage rating, is 12V in the preferred embodiment of the present invention, to reduce relay coil
Loss.Specifically, the confirmation signal that the base stage of triode Q1 receives is high level, triode Q1 conducting, so that there are following
Relational expression:
Vout/ ((R1//R3)+R2)=Vsense/R2
As described above, the voltage that PWM switching power source chip itself designs Vsense is 0.8V or so, the at this time resistance of R1, R2
Value is the resistance value that a upper link matches, then sets Vout as 12V, so that it may the resistance value for calculating R3, according to what is calculated
Resistance match circuit, then PWM switching power source chip can automatically adjust output voltage Vout to maintain the Vsense voltage to be
0.8V or so, while ensuring that relation above formula is set up, Vout will maintain 12V or so.The present inventor passes through survey
The electric current that control coil is flowed through when examination relay is attracted moment and keeps after being attracted, and confirmation is exchanged with relay producer,
Relay actuation moment needs high voltage, is generally not less than the 70% of rated coil voltage, but coil is kept after being attracted
Voltage can turn down the voltage at coil both ends down to the 50% of voltage rating, therefore after detecting that relay has been attracted,
The loss of relay coil is greatly reduced while so that relay is maintained at attracting state.It describes below in conjunction with Fig. 3 according to this hair
The control method of bright relay coil.
Fig. 3 shows the flow chart of the control method of relay coil according to one preferred embodiment of the present invention.Such as Fig. 3 institute
Show, the control method of the relay coil includes: to be attracted verification step S1 Voltage Feedback step S2 and voltage rate-determining steps
S3.The actuation verification step S1 detects voltage between the contact of relay major loop, and the confirmation whether output relay is attracted
Signal；Voltage Feedback step S2 generates feedback signal according to the confirmation signal；And voltage rate-determining steps S3, according to the feedback
The voltage at Signal Regulation relay coil both ends, so that setting the voltage at relay coil both ends when the relay is not attracted
It is set to first voltage, and the voltage at relay coil both ends is set below to the second electricity of first voltage when relay is attracted
Pressure.Wherein, first voltage is 70% or more of relay voltage rating, it is preferred that 80% or more, second voltage is relay
About the 50% of voltage rating.Specifically, if between the contact contacted with armature, i.e., voltage between A, B voltage U between contactAB,
Voltage U between the contact is detected in the actuation verification step S1AB, judge voltage U between the contactABWhether major loop (electricity is equal to
Net) voltage rating, if voltage is consistent with the voltage rating of the major loop between the contact, relay is not attracted；Conversely,
If the voltage rating of voltage and the major loop is inconsistent between the contact, relay is attracted.It is with coil rating voltage
For the relay of 24VDC, the realization of the control method is described in detail in conjunction with Fig. 2.
According to description above it is found that when confirmation signal is high level, triode Q1 conducting, resistance R3 accesses circuit,
When the confirmation signal is low level, triode Q1 is not turned on, and resistance R3 does not access circuit.The then Vsense of control unit 3
It is different according to above two different situations to terminate the feedback signal received.So as to according to the circuit meter of resistance R1, R2, R3
Calculation may determine that whether relay is attracted.Specifically, when relay is attracted, triode Q1 conducting, resistance R3 accesses circuit, compares
When resistance R3 does not access circuit, resistance is less than R1 after R1 and R3 are in parallel, and according to voltage divider principle, Vsense receives feedback signal electricity
Pressure increases, then the duty ratio reduction of PWM output leads to output voltage Vout reduction, so as to realize relay coil voltage
Control.It is specifically described below.
In circuit shown in Fig. 2, in positive and negative voltage input end input direct-current low pressure 24VDC, it is attracted confirmation circuit first
1 judges the attracting state of relay, and when determining relay and not being attracted, the confirmation signal is low level, triode Q1
It being not turned on, R3 does not access circuit, it is not involved in the setting of output voltage, described in working principle as above,
At this point, adjustable voltage Vout is set as 80% or more of relay voltage rating by voltage feedback circuit, this implementation
It is 20V in example, after PWM step-down switching power supply receives feedback signal, adjusts output voltage, make output voltage stabilization in 20V, greatly
In the 70% both 16.8VDC of voltage rating 24VDC, then relay can be reliably attracted.
On the other hand, it determining relay and has been attracted when being attracted confirmation circuit 1, confirmation signal is high level at this time, three
Pole pipe Q1 conducting, R3 accesses circuit, described in working principle as above, at this point, coil voltage feedback control circuit is by adjustable voltage
Vout is set as 50% or so of relay voltage rating, is 12V in present case, PWM step-down switching power supply receives feedback letter
After number, output voltage is adjusted, makes output voltage stabilization in 12V, relay is made to keep attracting state.
The control device and method of relay coil of the invention are described above.Side according to the present invention
Case, after being attracted relay with high voltage (for example, 80% or more of voltage rating), then to reduce coil voltage (specified
The 50% of voltage) keep attracting state.
Since big variation will not occur in certain temperature range for relay coil D.C. resistance, according to coil direct current
The heating principle of resistance, coil loss P=U2/R reduce coil both end voltage, and the loss of coil can be greatly reduced, and compare as follows:
Voltage rating: P1=U2/R；
50% voltage rating: P2=(0.5U)2/ R=0.25U2/R
As it can be seen that be reduced to voltage rating lower coil to be lost 1/ can be lost in relay coil by scheme according to the invention
4, effects of energy conservation and environmental protection is obvious, and relay surface temperature rise can be effectively reduced, its operating temperature is made to remain at low levels,
To effectively improve the reliability and service life of relay.Meanwhile also avoiding under closed electrical appliance kit hot environment, multiple
Heat accumulation caused by when relay uses simultaneously, that is, the temperature for reducing interior of electrical box makes other electronic components use the longevity
Life also greatly improves.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For, the invention can have various changes and changes.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of control device of relay coil characterized by comprising
It is attracted confirmation circuit, voltage feedback circuit and control unit；
Voltage between the contact that confirmation circuit is attracted for detecting relay major loop, and whether output relay is attracted really
Recognize signal；
The voltage feedback circuit is used to provide feedback signal, the Voltage Feedback to described control unit according to the confirmation signal
Circuit includes:
Triode, base stage connection is attracted the output end of confirmation circuit, for receiving the confirmation signal；
First resistor, the positive voltage input terminal of one end connection relay coil of the first resistor and the current collection of the triode
Pole；
Second resistance, one end of the second resistance connect the other end of the first resistor, the other end connection of the second resistance
The negative voltage input terminal of the relay coil；And
3rd resistor, one end of the 3rd resistor connect the emitter of the triode；
Wherein, the other end of the first resistor, described one end of the second resistance and the 3rd resistor is another
One end is connected to the feedback signal receiving end of described control unit；
And
Described control unit is used to control the voltage at the relay coil both ends according to the feedback signal, so that in the relay
First voltage is set by the voltage at relay coil both ends when device is not attracted, and when relay is attracted by relay coil two
The voltage at end is set below the second voltage of first voltage.
2. control device as described in claim 1, which is characterized in that
The first voltage is 70% or more of relay voltage rating, and the second voltage is relay voltage rating
40%-60%.
3. control device as described in claim 1, which is characterized in that the first voltage is the 80% of relay voltage rating
More than, the second voltage is the 50% of relay voltage rating.
4. control device as claimed in claim 1 or 2, which is characterized in that
If the voltage between contact of the voltage between the contact contacted with armature；
The actuation confirmation circuit detects voltage between the contact, and the specified electricity of major loop whether is equal to according to voltage between the contact
Pressure is to judge whether relay is attracted.
5. control device as claimed in claim 4, which is characterized in that
If voltage is consistent with the voltage rating of the major loop between the contact, the actuation confirmation circuit judges relay is not
It is attracted；If the voltage rating of voltage and the major loop is inconsistent between the contact, the actuation confirms circuit judges relay
Device is attracted.
6. control device as claimed in claim 5, which is characterized in that
If judging, relay is not attracted, the low level for being attracted confirmation circuit output as the confirmation signal；
If judging, relay is attracted, the high level for being attracted confirmation circuit output as the confirmation signal.
7. control device as described in claim 1, which is characterized in that
If judging, relay is not attracted, the low level for being attracted confirmation signal output as the confirmation signal；
The base stage of the triode receives the low level confirmation signal, and the triode is not turned on, then according to the following formula
The resistance value of the first, second resistance is set, so that the voltage at coil both ends is set to first voltage by control unit, so that relay
Device is attracted；
Vout/ (R1+R2)=Vsense/R2；
Wherein, Vout is relay coil positive voltage input terminal voltage, and R1, R2 are respectively the resistance of first resistor and second resistance
Value and Vsense are the setting voltage of control unit feedback signal receiving end.
8. control device as claimed in claim 7, which is characterized in that
If judging, relay is attracted, and is attracted high level of the confirmation circuit output as the confirmation signal；
The resistance value of 3rd resistor is then set according to the following formula, so that the voltage at coil both ends is set to second voltage by control unit,
So that relay maintains attracting state；
Vout/ ((R1//R3)+R2)=Vsense/R2
Wherein, R3 is the resistance value of 3rd resistor.
9. control device as claimed in claim 6, which is characterized in that
Described control unit is PWM Switching Power Supply.
10. a kind of control method realized using control device as claimed in one of claims 1 to 9 characterized by comprising
It is attracted verification step, detects voltage between the contact of relay major loop, and the confirmation signal whether output relay is attracted；
Voltage Feedback step generates feedback signal according to the confirmation signal；And
Voltage rate-determining steps, according to the voltage at the feedback signal regulating relay coil both ends, so that not inhaled in the relay
First voltage is set by the voltage at relay coil both ends when conjunction, and when relay is attracted by the electricity at relay coil both ends
Pressure is set below the second voltage of first voltage.
11. control method as claimed in claim 10, which is characterized in that
The first voltage is 70% or more of relay voltage rating, and the second voltage is relay voltage rating
40%-60%.
12. control method as claimed in claim 10, which is characterized in that the first voltage is relay voltage rating
80% or more, the second voltage is the 50% of relay voltage rating.
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| CN201811407666.3A CN109686617B (en) | 2017-08-28 | 2017-08-28 | Control device and method for relay coil |
| CN201710748539.9A CN107591282B (en) | 2017-08-28 | 2017-08-28 | Control device and method for relay coil |
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| CN108807077A (en) * | 2018-08-17 | 2018-11-13 | 苏州达宏电子科技有限公司 | A kind of electric ground switch control device |
| CN109471025B (en) * | 2018-11-09 | 2020-12-29 | 四川赛科安全技术有限公司 | Method for realizing electromagnetic relay line detection and feedback signal detection by double voltages |
| CN111799129B (en) * | 2020-07-17 | 2022-11-04 | 广州彩熠灯光股份有限公司 | Control method, control device and computer readable storage medium for three-phase relay |
| CN121297227A (en) * | 2025-12-09 | 2026-01-09 | 艾欧史密斯(中国)热水器有限公司 | Electric water heaters and their control methods |
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| CN1169206A (en) * | 1995-02-24 | 1997-12-31 | 西门子公司 | Circuit for controlling one contactor |
| CN1360730A (en) * | 1999-07-26 | 2002-07-24 | 默勒股份有限公司 | Method for effecting electronic drive control |
| CN101022062A (en) * | 2006-02-16 | 2007-08-22 | 刑建力 | The method of driving the relay on and off |
| CN103943410A (en) * | 2014-04-22 | 2014-07-23 | 宁波燎原电器集团股份有限公司 | Automatic switchover switching circuit based on magnetic latching relay |
| CN206301737U (en) * | 2016-11-14 | 2017-07-04 | 比亚迪股份有限公司 | Driving device of relay and automobile with same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109686617A (en) | 2019-04-26 |
| CN109686617B (en) | 2021-03-05 |
| CN107591282A (en) | 2018-01-16 |
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