CN105867225B - Load control circuit and its control method - Google Patents
Load control circuit and its control method Download PDFInfo
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- CN105867225B CN105867225B CN201610226123.6A CN201610226123A CN105867225B CN 105867225 B CN105867225 B CN 105867225B CN 201610226123 A CN201610226123 A CN 201610226123A CN 105867225 B CN105867225 B CN 105867225B
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- resistance
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- pass filter
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
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Abstract
The present invention relates to load control circuit and its control methods.The load control circuit includes sequentially connected low-pass filter, high-pass filter, driving circuit, electronic switch and relay circuit, and low-pass filter and high-pass filter connect and compose bandpass filter；The critical frequency of low-pass filter is ω 1, and the critical frequency of high-pass filter is ω 2, and 1 ＞ ω 2 of ω；Low-pass filter with the control signal output of a controller for connecting；The bandpass filter, the control signal for the control signal output output to the controller carry out gating processing；The driving circuit, for according to gating treated control signal control electronic switch conducting and cut-off, and then control relay circuit working condition；The relay circuit is connected and disconnected from for controlling load with power supply.The present invention can solve the problems, such as that controller is disturbed and easily causes accident.
Description
Technical field
The present invention relates to load control circuit and its control methods.
Background technology
Fig. 1 is common load control circuit.MCU gives triode Q1 base stage high potentials, triode Q1 collectors and transmitting
Pole pole is connected, and relay K1 control coils form access, its load end is made to be closed.MCU gives triode Q1 base stage low potentials, three poles
Pipe Q1 collector and emitters, relay K1 control coils open circuit, the normally opened contact of relay K1 disconnect, and load is stopped.
The above control is initiated by MCU, is broken down as MCU is interfered so that triode Q1 base stages are always high level, are caused
Load works long hours and can not close, and causes safety accident.For example, load, which is high-power heat-producing device, will cause fire.
Present society's electricity consumption equipment is more, and use environment is complicated, and the probability that the MCU in equipment is disturbed is big, easily causes event
Barrier.
Invention content
It is an object of the invention to propose a kind of load control circuit, controller can be solved and be disturbed and easily cause thing
Therefore problem.
In order to achieve the above object, the technical solution adopted in the present invention is as follows：
Load control circuit comprising sequentially connected low-pass filter, high-pass filter, driving circuit, electronic switch
And relay circuit, low-pass filter and high-pass filter connect and compose bandpass filter；The critical frequency of low-pass filter is ω
1, the critical frequency of high-pass filter is ω 2, and 1 ＞ ω 2 of ω；Low-pass filter is used to export with the control signal of a controller
End connection；The bandpass filter, the control signal for the control signal output output to the controller gate
Processing；The driving circuit, for according to gating treated control signal control electronic switch conducting and cut-off, and then control
The working condition of relay circuit processed；The relay circuit is connected and disconnected from for controlling load with power supply.
Preferably, the low-pass filter includes resistance R1 and capacitance C1, and the high-pass filter includes capacitance C2 and electricity
Hinder R2；One end of resistance R1 and the control signal output of controller connect, and the other end of resistance R1 is grounded by capacitance C1, electricity
The other end of resistance R1 also passes sequentially through capacitance C2, resistance R2 ground connection；The connecting node of resistance R2 and capacitance C2 connects with driving circuit
It connects.
It is further preferred that the driving circuit includes resistance R3, electrolytic capacitor C3 and resistance R4；The electronic switch is
Triode Q1；The relay circuit is relay K1；Resistance R2 is connect with the connecting node of capacitance C2 with one end of resistance R3, electricity
The other end of resistance R3 is connect by resistance R4 with the base stage of triode Q1, the anode of the other end of resistance R3 also with electrolytic capacitor C3
Connection, the cathode ground connection of electrolytic capacitor C3, the emitter ground connection of triode Q1, the collector of triode Q1 pass through relay K1's
Control coil is connect with a DC voltage, and load is connect by the normally opened contact of relay K1 with power supply.The triode Q1 is
NPN type triode.The voltage value of the DC voltage is 12V.
Based on above-mentioned load control circuit, the invention also discloses a kind of control methods comprising following steps：
When bandpass filter receives the control signal of the signal output end of controller, judge whether the control signal is full
Sufficient preset condition if so, driving circuit control electronic switch is closed, and then makes relay circuit be closed, to make load and electricity
Source connects；Otherwise, electronic switch ends, and then relay circuit is made to disconnect, to make load be disconnected with power supply；Wherein, described pre-
If condition in order to control signal frequency be ω, 1 ＞ ω ＞ ω 2 of ω.
Preferably, the duty ratio that the preset condition further includes control signal is 50%.
The present invention has the advantages that：
1, controller is in crash of breaking down（It is stopped）In the case of, the control signal of output be continuously it is high or
It is continuously low, both signal frequencies are all 0, so cannot be stopped operating to proof load by bandpass filter.
2, controller is operated under strong interference environment（It does not crash）, control signal is superimposed by high reject signal, as long as dry
It disturbs signal frequency and is in except the frequency separation that ω 1 and ω 2 is formed and cannot pass through, to which load control cannot be interfered with,
ω 1 and ω 2 frequency separation formed done by adjusting circuit parameter sufficiently narrow, most of interference signal can be filtered,
Proof load normal operation.
Description of the drawings
Fig. 1 is the circuit diagram of existing load control circuit；
Fig. 2 is the circuit diagram of the load control circuit of present pre-ferred embodiments.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the present invention is described further：
As shown in Fig. 2, a kind of load control circuit comprising sequentially connected low-pass filter, high-pass filter, driving
Circuit, electronic switch and relay circuit, low-pass filter and high-pass filter connect and compose bandpass filter；Low-pass filter
Critical frequency is ω 1, and the critical frequency of high-pass filter is ω 2, and 1 ＞ ω 2 of ω.Low-pass filter is used for and a controller
Control signal output connects；The bandpass filter, the control for the control signal output output to the controller
Signal carries out gating processing；The driving circuit, for according to gating treated control signal control electronic switch conducting
With cut-off, and then control relay circuit working condition；The relay circuit, for controlling load and power supply（ACN、ACL）'s
It is connected and disconnected from.
Specifically, the low-pass filter of the present embodiment includes resistance R1 and capacitance C1, the high-pass filter includes capacitance
C2 and resistance R2；One end of resistance R1 and the control signal output of controller connect, and the other end of resistance R1 passes through capacitance C1
The other end of ground connection, resistance R1 also passes sequentially through capacitance C2, resistance R2 ground connection；The connecting node of resistance R2 and capacitance C2 and driving
Circuit connects.
The driving circuit includes resistance R3, electrolytic capacitor C3 and resistance R4；The electronic switch is triode Q1；It is described
Relay circuit is relay K1；Resistance R2 is connect with the connecting node of capacitance C2 with one end of resistance R3, the other end of resistance R3
It is connect with the base stage of triode Q1 by resistance R4, the other end of resistance R3 is also connect with the anode of electrolytic capacitor C3, electrolysis electricity
Hold the cathode ground connection of C3, the emitter ground connection of triode Q1, the collector of triode Q1 by the control coil of relay K1 with
One DC voltage connects, and load is connect by the normally opened contact of relay K1 with power supply.The triode Q1 is three pole of NPN type
Pipe.The voltage value of the DC voltage is 12V.
The controller of the present embodiment is MCU.
Based on the present embodiment load control circuit, the present embodiment also discloses a kind of control method comprising following steps：
When bandpass filter receives the control signal of the signal output end of controller, judge whether the control signal is full
Sufficient preset condition if so, driving circuit control electronic switch is closed, and then makes relay circuit be closed, to make load and electricity
Source connects；Otherwise, electronic switch ends, and then relay circuit is made to disconnect, to make load be disconnected with power supply.
Wherein, the frequency of preset condition signal in order to control is ω, 1 ＞ ω ＞ ω 2 of ω, and controls the duty of signal
Than being 50%.
The operation principle of the present embodiment is as follows：
1, R1 and C1 forms low-pass filter circuit, 1=1/2 π R1C1, R2 and C2 composition high-pass filtering electricity of critical frequency ω
2=1/2 π R2C2 of road critical frequency ω, two filter circuits form bandwidth-limited circuit, adjust its component parameters so that ω 1
>ω 2, if MCU controls signal frequency is the square wave that ω duty ratios are 50%, as long as ω 1>ω>ω 2 can be filtered by band logical
Wave device.
2, control signal is charged through resistance R3 to electrolytic capacitor C3 by bandpass filter, because signal dutyfactor is 50%,
It is 2.5V if signal peak is voltage on 5V so capacitance C2 so capacitance cathode current potential only has the half of signal peak, three
The base drive resistance R4 voltages of pole pipe Q1 are 2.5V, are turned it on, loaded work piece.
3, during equipment normal use, MCU output frequencies are ω (ω 1>ω>ω 2) duty ratio be 50% control believe
Number, loaded work piece, exports low potential or high potential, load are stopped.
For those skilled in the art, technical solution that can be as described above and design are made other each
Kind is corresponding to be changed and deforms, and all these change and deform the protection model that should all belong to the claims in the present invention
Within enclosing.
Claims (6)
1. the control method of load control circuit, which is characterized in that the load control circuit includes sequentially connected low pass filtered
Wave device, high-pass filter, driving circuit, electronic switch and relay circuit, low-pass filter and high-pass filter connect and compose band
Bandpass filter；The critical frequency of low-pass filter is ω 1, and the critical frequency of high-pass filter is ω 2, and 1 ＞ ω 2 of ω；Low pass
Filter with the control signal output of a controller for connecting；The bandpass filter, for the control to the controller
The control signal of signal output end output processed carries out gating processing；The driving circuit, for treated to control according to gating
Signal controls the conducting and cut-off of electronic switch, and then controls the working condition of relay circuit；The relay circuit, for controlling
Load is connected and disconnected from power supply；The control method includes the following steps：
When bandpass filter receives the control signal of the signal output end of controller, it is pre- to judge whether the control signal meets
If condition, if so, driving circuit control electronic switch is closed, and then relay circuit is made to be closed, to make load connect with power supply
It connects；Otherwise, electronic switch ends, and then relay circuit is made to disconnect, to make load be disconnected with power supply；
Wherein, the preset condition in order to control signal frequency be ω, 1 ＞ ω ＞ ω 2 of ω.
2. control method as described in claim 1, which is characterized in that the preset condition further includes controlling the duty ratio of signal
It is 50%.
3. control method as described in claim 1, which is characterized in that the low-pass filter includes resistance R1 and capacitance C1,
The high-pass filter includes capacitance C2 and resistance R2；One end of resistance R1 and the control signal output of controller connect, electricity
The other end of resistance R1 is grounded by capacitance C1, and the other end of resistance R1 also passes sequentially through capacitance C2, resistance R2 ground connection；Resistance R2 with
The connecting node of capacitance C2 is connect with driving circuit.
4. control method as claimed in claim 3, which is characterized in that the driving circuit includes resistance R3, electrolytic capacitor C3
With resistance R4；The electronic switch is triode Q1；The relay circuit is relay K1；The connection section of resistance R2 and capacitance C2
Point is connect with one end of resistance R3, and the other end of resistance R3 is connect by resistance R4 with the base stage of triode Q1, and resistance R3's is another
One end is also connect with the anode of electrolytic capacitor C3, the cathode ground connection of electrolytic capacitor C3, the emitter ground connection of triode Q1, triode
The collector of Q1 is connect by the control coil of relay K1 with a DC voltage, load by the normally opened contact of relay K1 with
Power supply connects.
5. control method as claimed in claim 4, which is characterized in that the triode Q1 is NPN type triode.
6. control method as claimed in claim 4, which is characterized in that the voltage value of the DC voltage is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610226123.6A CN105867225B (en) | 2016-04-13 | 2016-04-13 | Load control circuit and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610226123.6A CN105867225B (en) | 2016-04-13 | 2016-04-13 | Load control circuit and its control method |
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| Publication Number | Publication Date |
|---|---|
| CN105867225A CN105867225A (en) | 2016-08-17 |
| CN105867225B true CN105867225B (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610226123.6A Active CN105867225B (en) | 2016-04-13 | 2016-04-13 | Load control circuit and its control method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684817B (en) * | 2016-12-29 | 2019-04-19 | 青岛海尔科技有限公司 | A kind of protection circuit, load driving circuits and electric appliance |
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| CN201107396Y (en) * | 2007-10-19 | 2008-08-27 | 江苏科技大学 | Direct-current power supply analog device |
| KR20110113492A (en) * | 2010-04-09 | 2011-10-17 | 엘에스산전 주식회사 | Apparatus for changing mode in proportional integral differential controller |
| CN103166431A (en) * | 2013-03-12 | 2013-06-19 | 北京机械设备研究所 | Switching power supply load end voltage stabilizing circuit with integrated common mode filter |
| CN203586566U (en) * | 2013-11-11 | 2014-05-07 | 青岛三利中德美水设备有限公司 | Air source water heating control system capable of preventing harmonic interference |
| CN203851013U (en) * | 2014-04-11 | 2014-09-24 | 青岛云路新能源科技有限公司 | AC/DC signal circuit dual-purpose filter |
| CN204559382U (en) * | 2015-03-30 | 2015-08-12 | 广东美的制冷设备有限公司 | There are the filter circuit of electromagnetic interference inhibit feature, Switching Power Supply and household electrical appliance |
| CN205507464U (en) * | 2016-04-13 | 2016-08-24 | 广州市联特电子科技有限公司 | Loaded control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060090855A1 (en) * | 2004-10-29 | 2006-05-04 | Tokyo Electron Limited | Substrate mounting table, substrate processing apparatus and substrate temperature control method |
-
2016
- 2016-04-13 CN CN201610226123.6A patent/CN105867225B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107396Y (en) * | 2007-10-19 | 2008-08-27 | 江苏科技大学 | Direct-current power supply analog device |
| KR20110113492A (en) * | 2010-04-09 | 2011-10-17 | 엘에스산전 주식회사 | Apparatus for changing mode in proportional integral differential controller |
| CN103166431A (en) * | 2013-03-12 | 2013-06-19 | 北京机械设备研究所 | Switching power supply load end voltage stabilizing circuit with integrated common mode filter |
| CN203586566U (en) * | 2013-11-11 | 2014-05-07 | 青岛三利中德美水设备有限公司 | Air source water heating control system capable of preventing harmonic interference |
| CN203851013U (en) * | 2014-04-11 | 2014-09-24 | 青岛云路新能源科技有限公司 | AC/DC signal circuit dual-purpose filter |
| CN204559382U (en) * | 2015-03-30 | 2015-08-12 | 广东美的制冷设备有限公司 | There are the filter circuit of electromagnetic interference inhibit feature, Switching Power Supply and household electrical appliance |
| CN205507464U (en) * | 2016-04-13 | 2016-08-24 | 广州市联特电子科技有限公司 | Loaded control circuit |
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| CN105867225A (en) | 2016-08-17 |
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