CN109585220A - The control circuit and its control method opened for dynamic driving relay - Google Patents
The control circuit and its control method opened for dynamic driving relay Download PDFInfo
- Publication number
- CN109585220A CN109585220A CN201811291787.6A CN201811291787A CN109585220A CN 109585220 A CN109585220 A CN 109585220A CN 201811291787 A CN201811291787 A CN 201811291787A CN 109585220 A CN109585220 A CN 109585220A
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- Prior art keywords
- triode
- diode
- relay
- storage capacitor
- capacitor
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Classifications
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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
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
- H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other
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- Relay Circuits (AREA)
Abstract
The present invention relates to a kind of control circuits and its control method opened for dynamic driving relay；The control circuit contains the first and second resistance, the first and second diode, first capacitor, storage capacitor and triode, the signal exported from control unit enters the anode of first diode by first resistor, first capacitor, its cathode is connected by second resistance and the base stage of triode, the coil of relay and the collector of triode connect, the cathode of second diode and the anode of first diode connect, its plus earth, storage capacitor are attempted by between the cathode of first diode and ground；The control method are as follows: after control unit output pwm signal makes triode ON, the failing edge of pwm signal appear in the voltage peak on storage capacitor, before the minimum amount of voltage that from peak-fall to driving triode, the rising edge of pwm signal occurs；Relay caused by when the present invention can avoid control unit failure may be connected for a long time, and structure is simple, at low cost.
Description
(1), technical field:
The present invention relates to a kind of control relay circuit and its control methods, in particular to a kind of to be used for dynamic driving relay
The control circuit and its control method that device is opened.
(2), background technique:
Currently, the circuit for being related to gas-fired equipment mostly requires that the control to switch will be accomplished securely and reliably, to work as master control
Relevant switch is closed when device failure processed, prevent safety accident；Common relay static drive circuit is possible to
After processor (MCU) failure, the I/O mouth state of processor is chronically at high level or low level, and having so as to cause relay can
Can be in the open state, the component (gas electromagnetic valve etc.) of relay control may also be in long-term open state, if the portion
Part is the on-off for controlling combustion gas, it is possible to reveal combustion gas for a long time, so as to cause safety accident, cause the injures and deaths of personnel
With the loss of property.
(3), summary of the invention:
The technical problem to be solved by the present invention is provide it is a kind of for dynamic driving relay open control circuit and its
Control method, the control circuit and its control method can avoid in the prior art the I/O mouth failure of control unit when caused by after
Electric appliance may be connected for a long time, and so as to avoid the generation of safety accident, and the controling circuit structure is simple, at low cost.
Technical solution of the present invention:
A kind of control circuit opened for dynamic driving relay, contains first resistor, second resistance, the one or two pole
Pipe, the second diode, first capacitor, storage capacitor and triode, the signal exported from the output port of control unit is by the
One resistance enters one end of first capacitor, and the other end of first capacitor and the anode of first diode connect, first diode
Cathode is connected by second resistance and the base stage of triode, and coil one end of relay and the collector of triode connect, three poles
Pipe is NPN type triode, and the cathode of the second diode and the anode of first diode connect, the plus earth of the second diode,
Storage capacitor is attempted by between the cathode of first diode and ground；In order to guarantee the normal work of the control circuit, storage capacitor
Capacitance be 40 times or more of capacitance of first capacitor, supply triode to guarantee to have more energy on storage capacitor,
The resistance value of second resistance is 15 times or more of the resistance value of first resistor, to guarantee that the charging current of storage capacitor is greater than electric discharge electricity
Stream.
The resistance value of first resistor is 100 Ω；The resistance value of second resistance is 2K Ω；The capacitance of storage capacitor is 4.7uF；First
The capacitance of capacitor is 0.1uf.
The control circuit opened for dynamic driving relay also contains 3rd resistor, and the base stage of triode passes through third electricity
Resistance ground connection, the emitter ground connection of triode, another termination driving power of the coil of relay.
First diode forms diode combination together with the second diode package, the model of the diode combination
BAV99。
First resistor is used to adjust the charging current of first capacitor and storage capacitor and the discharge current of first capacitor；Storage
Energy capacitor is for storing the energy for making triode ON；When conducting voltage of the voltage on storage capacitor higher than triode, and
When being capable of providing the electric current to transistor base, triode ON can be made, to drive the actuating of relay.
A kind of control method of the control circuit opened for dynamic driving relay, specifically: control unit
Output port output pwm signal, high level signal or low level signal；The output port of control unit passes through output pwm signal
Make triode ON, relay is attracted；The output port of control unit makes three by output high level signal or low level signal
Pole pipe cut-off, relay release；The failing edge of pwm signal appears in after the voltage on storage capacitor reaches peak value, energy storage electricity
Voltage in appearance, which reaches, to be gradually reduced after peak value, before dropping to the minimum amount of voltage that of driving triode, pwm signal it is upper
It rises along appearance, then, the voltage on storage capacitor is begun to ramp up again.
When the resistance value of first resistor is 100 Ω, the resistance value of second resistance is 2K Ω, the capacitance of storage capacitor is 4.7uF,
When the capacitance of one capacitor is 0.1uf, the frequency of pwm signal is 50Khz, and duty ratio 50% can just make triode ON in this way,
Relay is attracted.
The working principle of control circuit for the unlatching of dynamic driving relay is as follows:
Pwm signal control: after the output port of control unit exports high level, first capacitor and storage capacitor start to fill
Electricity, when the voltage on storage capacitor is higher than the turn-on condition of triode, the coil of triode ON, relay is powered, at this time
Since the charging current of first capacitor is greater than the driving current of transistor base, so storage capacitor can continue to charge, until
Storage capacitor is fully charged energy, and later due to driving relay energy consumption, storage capacitor starts to discharge, but first capacitor
Continue to be electrically charged, increase the electricity in first capacitor, the electricity on storage capacitor gradually decreases, at this point, control unit is defeated
Exit port exports low level, rapidly bleeds off the electricity on storage capacitor, due to the one-way conduction characteristic of first diode, the
Discharge current on one capacitor does not increase, and storage capacitor discharges merely by the base stage of triode, on storage capacitor
Voltage drop to before the minimum amount of voltage that of driving triode, the output port of control unit exports high level for the second time, again
Start to charge to first capacitor and storage capacitor, there are enough electricity just repeatedly, on storage capacitor to maintain three poles of driving
The conducting of pipe, to guarantee that relay is constantly in attracting state, so that the solenoid valve for controlling it is opened.
Level control:
When the output port of control unit is constantly in high level, the electricity on storage capacitor can be discharged, will not be by
It recharges, triode is not turned on, and causes relay to be constantly in release conditions, thus the electromagnetism valve breakdown for controlling it.
When the output port of control unit is constantly in low level, there will be no electric energy, triodes on storage capacitor
It does not turn on, relay is constantly in release conditions, thus the electromagnetism valve breakdown for controlling it.
Beneficial effects of the present invention:
1, the present invention is not pwm signal when the I/O mouth of control unit exports using the unlatching of pwm signal control relay
When (such as long-term high level or low level state), relay can be automatically closed, guarantee the component (gas electromagnetic valve of relay driving
Deng) be automatically closed, to guarantee safety.The invention avoids (be chronically at when the I/O of control unit in the prior art mouth failure
High level or low level state), component (the combustion gas electromagnetism for causing relay that may be connected for a long time, and then relay being caused to control
Valve etc.) it may be connected for a long time, to cause the possibility of safety accident.
2, the configuration of the present invention is simple, at low cost.
(4), Detailed description of the invention:
Fig. 1 is the circuit theory schematic diagram for the control circuit opened for dynamic driving relay；
Fig. 2 is the waveform diagram of the voltage on pwm signal and storage capacitor.
(5), specific embodiment:
Referring to FIG. 1 to FIG. 2, in figure, the control circuit opened for dynamic driving relay contains first resistor R235, the
Two resistance R236, first diode, the second diode, first capacitor C129, storage capacitor C128 and triode Q44, from control
The signal of the output port output of unit MCU enters one end of first capacitor C129, first capacitor by first resistor R235
The other end of C129 and the anode of first diode connect, and the cathode of first diode passes through second resistance R236 and triode
The base stage of Q44 connects, and coil one end of relay REL7 is connect with the collector of triode Q44, and triode Q44 is NPN type three
Pole pipe, model S8050, the cathode of the second diode and the anode of first diode connect, and the anode of the second diode connects
Ground, storage capacitor C128 are attempted by between the cathode of first diode and ground；In order to guarantee the normal work of the control circuit, the
The resistance value of one resistance R235 is 100 Ω；The resistance value of second resistance R236 is 2K Ω；The capacitance of storage capacitor C128 is 4.7uF；The
The capacitance of one capacitor C129 is 0.1uf.The parameter setting of these devices can guarantee that the charging current of storage capacitor C128 is greater than
Discharge current, moreover it is possible to guarantee to have more energy on storage capacitor C128 to supply triode Q44.
The control circuit opened for dynamic driving relay also contains 3rd resistor R237, the resistance value of 3rd resistor R237
Base stage for 47K Ω, triode Q44 is grounded by 3rd resistor R237, the emitter ground connection of triode Q44, relay REL7
Another termination driving power VCC_12V of coil.
First diode forms diode combination D47 together with the second diode package, the type of diode combination D47
Number be BAV99.
First resistor R235 is used to adjust the charging current and first capacitor of first capacitor C129 and storage capacitor C128
The discharge current of C129；Storage capacitor C128 is used to store the energy that triode Q44 is connected；Electricity on storage capacitor C128
When pressing QD to be higher than the conducting voltage of triode Q44, and being capable of providing the electric current to triode Q44 base stage, triode can be made
Q33 conducting, so that relay REL7 be driven to act.
The control method of the above-mentioned control circuit opened for dynamic driving relay are as follows: the output end of control unit MCU
Mouth output pwm signal PWM, high level signal or low level signal；The output port of control unit MCU passes through output pwm signal
Triode Q44 is connected in PWM, and relay REL7 is attracted；The output port of control unit MCU passes through output high level signal or low
Level signal ends triode Q44, relay REL7 release；The failing edge of pwm signal PWM appears on storage capacitor C128
Voltage QD reach peak value (at 203) after, the voltage QD on storage capacitor C128, which reaches, to be gradually reduced after peak value, under
It dropping to before the minimum amount of voltage that of driving triode Q44, the rising edge (at 204) of pwm signal PWM occurs, then, energy storage electricity
The voltage QD held on C128 is begun to ramp up again.
The frequency of pwm signal PWM is 50Khz, and duty ratio 50%, amplitude 3V just can be such that triode Q44 leads in this way
Logical, relay REL7 is attracted.
The working principle of control circuit for the unlatching of dynamic driving relay is as follows:
Pwm signal control: after the output port of control unit MCU exports high level, first capacitor C129 and energy storage electricity
Hold C128 to start to charge, when the voltage QD on storage capacitor C128 is higher than the turn-on condition of triode Q44, triode Q44 is led
Logical, the coil of relay REL7 is powered, at this time since the charging current of first capacitor C129 is greater than the driving of triode Q44 base stage
Electric current, so storage capacitor C128 can continue to charge, until storage capacitor C128 is fully charged can be (at see 203), Zhi Houyou
In drive relay REL7 energy consumption the reason of, storage capacitor C128 starts to discharge, but first capacitor C129 continues to be electrically charged, and makes
Electricity on first capacitor C129 increases, and the electricity on storage capacitor C128 gradually decreases, at this point, the output of control unit MCU
Port exports low level, rapidly bleeds off the electricity on storage capacitor C128, due to the one-way conduction characteristic of first diode,
Discharge current on first capacitor C129 does not increase, and storage capacitor C128 discharges merely by the base stage of triode Q44,
Before the voltage QD on storage capacitor C128 drops to the minimum amount of voltage that of driving triode Q44, the output of control unit MCU
Port exports high level for the second time, and starts to charge to first capacitor C129 and storage capacitor C128, repeatedly, storage capacitor
Just there are enough electricity to maintain the conducting of driving triode Q44 on C128, to guarantee that relay REL7 is constantly in actuation
State, so that the solenoid valve for controlling it is opened.
Level control:
When the output port of control unit MCU is constantly in high level, the electricity on storage capacitor C128 can be discharged,
It will not be recharged, triode Q44 is not turned on, and causes relay REL7 to be constantly in release conditions, thus the electricity for controlling it
Magnet valve shutdown.
When the output port of control unit MCU is constantly in low level, there will be no electric energy on storage capacitor C128, three
Pole pipe Q44 will not be connected, and relay REL7 is constantly in release conditions, thus the electromagnetism valve breakdown for controlling it.
Claims (6)
1. a kind of control circuit opened for dynamic driving relay, it is characterized in that: containing first resistor, second resistance, the
One diode, the second diode, first capacitor, storage capacitor and triode, the signal exported from the output port of control unit
Entering one end of first capacitor by first resistor, the other end of first capacitor and the anode of first diode connect, and the one or two
The cathode of pole pipe is connected by second resistance and the base stage of triode, and coil one end of relay and the collector of triode connect
It connects, triode is NPN type triode, and the cathode of the second diode and the anode of first diode connect, and the second diode is just
Pole ground connection, storage capacitor are attempted by between the cathode of first diode and ground；The capacitance of storage capacitor is the capacitance of first capacitor
40 times or more, the resistance value of second resistance is 15 times or more of the resistance value of first resistor.
2. the control circuit according to claim 1 opened for dynamic driving relay, it is characterized in that: first electricity
The resistance value of resistance is 100 Ω；The resistance value of second resistance is 2K Ω；The capacitance of storage capacitor is 4.7uF；The capacitance of first capacitor is
0.1uf。
3. the control circuit according to claim 1 opened for dynamic driving relay, it is characterized in that: also containing third
The base stage of resistance, triode is grounded by 3rd resistor, the emitter ground connection of triode, another termination driving of the coil of relay
Power supply.
4. the control circuit according to claim 1 opened for dynamic driving relay, it is characterized in that: the described 1st
Pole pipe forms diode combination together with the second diode package, the model BAV99 of the diode combination.
5. a kind of controlling party of the control circuit according to any one of claims 1 to 4 opened for dynamic driving relay
Method, it is characterized in that: output port output pwm signal, high level signal or the low level signal of described control unit；Control unit
Output port triode ON is made by output pwm signal, relay is attracted；The output port of control unit is high by output
Level signal or low level signal end triode, relay release；The failing edge of pwm signal appears on storage capacitor
After voltage reaches peak value, the voltage on storage capacitor is gradually reduced after reaching peak value, is dropping to driving triode most
Before small voltage value, the rising edge of pwm signal occurs, and then, the voltage on storage capacitor is begun to ramp up again.
6. the control method of the control circuit according to claim 5 opened for dynamic driving relay, it is characterized in that:
When the resistance value of the first resistor is 100 Ω, the resistance value of second resistance is 2K Ω, the capacitance of storage capacitor is 4.7uF, the first electricity
When the capacitance of appearance is 0.1uf, the frequency of pwm signal is 50Khz, duty ratio 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291787.6A CN109585220A (en) | 2018-10-31 | 2018-10-31 | The control circuit and its control method opened for dynamic driving relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811291787.6A CN109585220A (en) | 2018-10-31 | 2018-10-31 | The control circuit and its control method opened for dynamic driving relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109585220A true CN109585220A (en) | 2019-04-05 |
Family
ID=65921141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811291787.6A Pending CN109585220A (en) | 2018-10-31 | 2018-10-31 | The control circuit and its control method opened for dynamic driving relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109585220A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886888A (en) * | 2019-10-23 | 2020-03-17 | 华帝股份有限公司 | Electromagnetic valve control system and control method |
| CN112992605A (en) * | 2021-05-06 | 2021-06-18 | 深圳市永联科技股份有限公司 | Isolation unit and related product |
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|---|---|---|---|---|
| US20080204964A1 (en) * | 2005-01-08 | 2008-08-28 | Emerson Network Power Energy System Ab | Bistable Contactor Drive Circuit |
| CN202616142U (en) * | 2012-05-14 | 2012-12-19 | 美的集团有限公司 | Relay control circuit |
| CN202996719U (en) * | 2012-11-13 | 2013-06-12 | 佛山市顺德区瑞德电子实业有限公司 | Relay drive circuit with double protection loops |
| CN203895363U (en) * | 2014-05-09 | 2014-10-22 | 杭州和而泰智能控制技术有限公司 | Driving and switch state detection circuit of relay |
| CN104658818A (en) * | 2013-11-26 | 2015-05-27 | 青岛鼎信通讯股份有限公司 | Relay drive circuit |
| CN204651247U (en) * | 2015-06-04 | 2015-09-16 | 浙江智联电子有限公司 | A kind of electric cooker relay drive circuit |
| CN207116332U (en) * | 2017-09-07 | 2018-03-16 | 神州金山物联网科技（上海）有限公司 | Safety type relay control circuit |
-
2018
- 2018-10-31 CN CN201811291787.6A patent/CN109585220A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080204964A1 (en) * | 2005-01-08 | 2008-08-28 | Emerson Network Power Energy System Ab | Bistable Contactor Drive Circuit |
| CN202616142U (en) * | 2012-05-14 | 2012-12-19 | 美的集团有限公司 | Relay control circuit |
| CN202996719U (en) * | 2012-11-13 | 2013-06-12 | 佛山市顺德区瑞德电子实业有限公司 | Relay drive circuit with double protection loops |
| CN104658818A (en) * | 2013-11-26 | 2015-05-27 | 青岛鼎信通讯股份有限公司 | Relay drive circuit |
| CN203895363U (en) * | 2014-05-09 | 2014-10-22 | 杭州和而泰智能控制技术有限公司 | Driving and switch state detection circuit of relay |
| CN204651247U (en) * | 2015-06-04 | 2015-09-16 | 浙江智联电子有限公司 | A kind of electric cooker relay drive circuit |
| CN207116332U (en) * | 2017-09-07 | 2018-03-16 | 神州金山物联网科技（上海）有限公司 | Safety type relay control circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886888A (en) * | 2019-10-23 | 2020-03-17 | 华帝股份有限公司 | Electromagnetic valve control system and control method |
| CN110886888B (en) * | 2019-10-23 | 2021-08-27 | 华帝股份有限公司 | Electromagnetic valve control system and control method |
| CN112992605A (en) * | 2021-05-06 | 2021-06-18 | 深圳市永联科技股份有限公司 | Isolation unit and related product |
| CN112992605B (en) * | 2021-05-06 | 2021-08-06 | 深圳市永联科技股份有限公司 | Isolation unit and related product |
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Application publication date: 20190405 |