CN207338245U - A kind of relay drive circuit of pwm pulse control - Google Patents
A kind of relay drive circuit of pwm pulse control Download PDFInfo
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- CN207338245U CN207338245U CN201721206045.XU CN201721206045U CN207338245U CN 207338245 U CN207338245 U CN 207338245U CN 201721206045 U CN201721206045 U CN 201721206045U CN 207338245 U CN207338245 U CN 207338245U
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- relay
- mosfet transistor
- pwm pulse
- circuit
- grid
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Abstract
The utility model discloses a kind of relay drive circuit of pwm pulse control, including microcontroller U1, filter capacitor C1, mosfet transistor Q1, coil windings K1, sustained diode 1, and a condition indication circuit, the condition indication circuit are made of light emitting diode D2, noise reduction capacitance C2, current-limiting resistance R1；The output terminal of the microcontroller U1 is connected with the grid of the mosfet transistor Q1；Described filter capacitor C1 the two poles of the earth connect the grid and source electrode of mosfet transistor Q1, source electrode grounding connection respectively, and the drain electrode of the mosfet transistor Q1 is connected conducting with coil windings K1 one end of relay again；One sustained diode 1 of relay coil winding K1 both ends parallel connection, and parallel connection indicating circuit, coil windings K1 other ends connection power supply side；Using pulse control mode, the voltage change for making relay coil winding K1 both sides is pwm pulse waveform, not only reduces the power consumption of relay and whole PLC components, while extend the service life of relay.
Description
Technical field
The utility model is related to industrial control circuit technical field, concretely relate to a kind of control of pwm pulse after
Electrical apparatus driving circuit.
Background technology
In recent years, promoted with the theory of industry 4.0, relay has obtained widely should in industrial control system
With, and the PLC time relays are increasingly becoming first choice electricity when numerous engineers apply at the scene because possessing timing control function
Gas product.
The PLC time relays possess it is multi-functional at the same time, there is also power consumption caused by traditional relay control mode
Greatly, the problem of heat dissipation effect is poor.Moreover, the PLC time relays are placed because of using solid matter, and local width relatively narrow (6mm)
Limitation so that heat is concentrated, and is unfavorable for radiating, can also be shortened the life cycle of relay product.
For traditional PLC time relays after command signal is received, microcontroller exports a stable low level letter
Number so that coil windings both ends work normally, and then control the contact of relay to carry out corresponding actions, coil both sides in parallel 1
A condition indication circuit, and fly-wheel diode circuit.When power supply connects, dash current is loaded directly at relay both ends, is continued
Stream diode or condition indication circuit are easy to burn out, and the dash current in circuit gives off heat by coil windings, heat
Amount, which is gathered in relay shell body, to be difficult to distribute, and relay life will be shortened by working long hours.
Utility model content
The utility model aim：In view of traditional application mode power consumption of the PLC time relays is larger, heat dissipation effect difference is asked
Topic, if by the way of hardware design is changed, then the cost of product will be improved, the competitive advantage of product can be reduced, no
Beneficial to the popularization in market；To overcome the shortcomings of the existing technology, driven the utility model lies in that providing a kind of relay of pwm pulse control
Dynamic circuit, solves relay high power consumption and heat dissipation problem, extends the service life of relay.
Technical solution：In order to solve the above technical problems, the utility model adopts the following technical solution：
A kind of relay drive circuit of pwm pulse control, it is characterised in that：Including microcontroller U1, filter capacitor
C1, mosfet transistor Q1, coil windings K1, sustained diode 1, and a condition indication circuit, the state instruction electricity
It route light emitting diode D2, noise reduction capacitance C2, current-limiting resistance R1 compositions；The output terminal of the microcontroller U1 and the MOSFET
The grid connection of transistor Q1；Described filter capacitor C1 the two poles of the earth connect the grid and source electrode of mosfet transistor Q1, source electrode respectively
Grounding connection, the drain electrode of the mosfet transistor Q1 are connected conducting with coil windings K1 one end of relay again；Relay line
A winding K1 both ends sustained diode 1 in parallel is enclosed, while parallel connection indicating circuit again, the coil windings K1 other ends connect
Meet power supply side VCC；Microcontroller U1 exports the burning voltage signal of certain time length at signal initial stage, filtered
Capacitance C1 is filtered, and microcontroller U1 output signals are converted to pwm pulse, and driving mosfet transistor Q1's is switched off and on, and controls
The voltage of relay coil winding K1 processed controls relay, and coil windings K1 both sides parallel connection indicating circuit shows work shape
State.
Sustained diode 1, relay coil winding K1 and the condition indication circuit composition closed circuit.
The mosfet transistor Q1 is NMOS triodes either PMOS triodes or IGBT triode.
The beneficial effect of the technical program：The utility model is controlled by the voltage change of continuous-stable for pwm pulse, access
Mosfet transistor Q1 front end circuits drive relay, using pwm pulse control design case not only greatly reduce relay and
The power consumption of whole PLC components, while also so that product cost reduces, so as to extend the service life of relay；In addition, loading
Lc circuit limits coil windings K1 powered on moment impact electric currents；With protect continued flow component, coil will not because electric current moment
Impact and damage.
Brief description of the drawings
Fig. 1 is a kind of relay drive circuit schematic diagram of pwm pulse control of the utility model；
Fig. 2 is a kind of relay drive circuit impulse waveform schematic diagram of pwm pulse control of the utility model
In figure, microcontroller U1, filter capacitor C1, mosfet transistor Q1, coil windings K1, sustained diode 1, limit
Leakage resistance R1, light emitting diode D2, noise reduction capacitance C2.
Embodiment
Embodiment 1
As shown in Figure 1, a kind of relay drive circuit of pwm pulse control, including microcontroller U1, filter capacitor C1,
Mosfet transistor Q1, coil windings K1, sustained diode 1, and a condition indication circuit, the condition indication circuit
It is made of light emitting diode D2, noise reduction capacitance C2, current-limiting resistance R1；The output terminal of the microcontroller U1 is brilliant with the MOSFET
The grid connection of body pipe Q1；Described filter capacitor C1 the two poles of the earth connect the grid and source electrode of mosfet transistor Q1 respectively, and source electrode connects
Ground connects, and the drain electrode of the mosfet transistor Q1 is connected conducting with coil windings K1 one end of relay again；Relay coil
One sustained diode 1 of winding K1 both ends parallel connection, while parallel connection indicating circuit again, the connection of the coil windings K1 other ends
Power supply side VCC；Microcontroller U1 exports the burning voltage signal of certain time length, filtered electricity at signal initial stage
Hold C1 filtering, microcontroller U1 output signals are converted to pwm pulse, and driving mosfet transistor Q1's is switched off and on, and controls
The voltage of relay coil winding K1 controls relay, and coil windings K1 both sides parallel connection indicating circuit shows work shape
State.
The microcontroller U1 output pwm signals, the burr interference in filtered capacitance C1 filtering circuits, pulse letter
The grid of mosfet transistor Q1 number is transferred to, when the opening more than mosfet transistor Q1 of the voltage Ugs between grid and source class
When opening voltage VT, i.e., pwm pulse is in the Ton cycles, and mosfet transistor Q1 is in the conduction state, and relay coil winding K1 is born
Turn on, relay coil winding K1 both ends obtain reliable supply voltage, relay work, and drive extreme and power supply
Contact disconnects or is attracted, and drives follow-up equipment work；At this time, since the time of low potential is Toff, meet Toff be less than after
The coil windings K1 of electric appliance minimum release time, relay do not have the action that time enough completes break contact, and then under
One PWM wave period arrives, microcontroller U1 output high potentials, and then turns on mosfet transistor Q1, relay coil around
Group K1 both ends obtain normal operating voltage signal, relay work, maintain the holding of relay to be attracted with this PWM ripple
Function, when microcontroller U1 export low potential when, mosfet transistor Q1 normal switching-offs, relay winding both ends lose electricity
Pressure, so as to complete the release of contact.
Further, the filter capacitor C1 is preferably electrolytic capacitor, and the high-frequency noise that filtering circuit produces, cuts off
The path that device is propagated by current supply circuit；Prevent the noise that power supply carries forms circuit from disturbing；Therefore, the PWM of output
Signal is by filtering noise reduction so that output voltage is interference-free, so as to ensure that MOSFET crystal will not be caused due to interference signal
Pipe Q1's misleads.
Further, the sustained diode 1 connects the element both ends for producing induced electromotive force in parallel, and
Formed circuit, is not punctured or is burnt out by induced voltage for protection element in circuit, its high electromotive force produced is existed
Circuit is consumed in a manner of afterflow, so as to play the role of protecting the element in circuit not impaired.
Further, the mosfet transistor Q1 is NMOS triodes either tri- pole of PMOS triodes or IGBT
Pipe；Belong to voltage controlled semiconductor device, used as electronic switch, at the connecting node of collection mosfet transistor Q1
Voltage, drive circuit is fed back to by the voltage signal, is adjusted PWM waveform according to feedback result, is exported by microcontroller U1
3.3V vulnerabilities scan 24V relay on-offs, its with input resistance is high, noise is small, it is low in energy consumption, be easily integrated, hit secondary
Wear phenomenon, safety operation area field width advantage.
Further, the condition indication circuit includes current-limiting resistance R1, light emitting diode D2, and is connected in parallel on luminous
The noise reduction capacitance C2 at diode D2 both ends, its display directly perceived to relay working status；When relay coil winding K1 both ends
During without normal supply voltage, condition indication circuit is not lighted also without operating voltage, light emitting diode D2；When relay line
When enclosing both ends normal power supply, the same normal power supply of condition indication circuit, light emitting diode D2 is lighted.
The utility model uses pwm pulse control mode, makes the voltage of relay coil both sides by the voltage of continuous-stable
Change turns to pwm pulse waveform, which not only greatly reduces the power consumption of relay and whole PLC components, at the same time
Also so that product cost reduces；On the other hand, by using the control mode of pwm pulse waveform, relay is made in high environment temperature
When spending, it can ensure relay temperature rise control in safe range, so as to extend the service life of relay.
The technical principle of the utility model is described above in association with specific embodiment, these descriptions are intended merely to explain this reality
With new principle, and the limitation to scope of protection of the utility model cannot be construed in any way；Based on explanation herein,
Those skilled in the art would not require any inventive effort the other embodiments that can associate the utility model
These modes are fallen within the scope of protection of the utility model.
Claims (4)
- A kind of 1. relay drive circuit of pwm pulse control, it is characterised in that：Including microcontroller U1, filter capacitor C1, Mosfet transistor Q1, coil windings K1, sustained diode 1, and a condition indication circuit, the condition indication circuit It is made of light emitting diode D2, noise reduction capacitance C2, current-limiting resistance R1；The output terminal of the microcontroller U1 is brilliant with the MOSFET The grid connection of body pipe Q1；Described filter capacitor C1 the two poles of the earth connect the grid and source electrode of mosfet transistor Q1 respectively, and source electrode connects Ground connects, and the drain electrode of the mosfet transistor Q1 is connected conducting with coil windings K1 one end of relay again；Relay coil One sustained diode 1 of winding K1 both ends parallel connection, while parallel connection indicating circuit again, the connection of the coil windings K1 other ends Power supply side VCC；Microcontroller U1 exports the burning voltage signal of certain time length, filtered electricity at signal initial stage Hold C1 filtering, microcontroller U1 output signals are converted to pwm pulse, and driving mosfet transistor Q1's is switched off and on, and controls The voltage of relay coil winding K1 controls relay, and coil windings K1 both sides parallel connection indicating circuit shows work shape State.
- A kind of 2. relay drive circuit of pwm pulse control according to claim 1, it is characterised in that：Described is continuous Flow diode D1, relay coil winding K1 and condition indication circuit composition closed circuit.
- A kind of 3. relay drive circuit of pwm pulse control according to claim 1, it is characterised in that：Described is micro- Controller U1 output pwm signals, the burr interference in filtered capacitance C1 filtering circuits, pulse signal are transferred to MOSFET crystalline substances The grid of body pipe Q1, when the voltage Ugs between grid and source class is more than the cut-in voltage VT of mosfet transistor Q1, i.e. PWM Pulse is in the Ton cycles, and mosfet transistor Q1 is in the conduction state；When the voltage Ugs between grid and source class is less than During the cut-in voltage VT of mosfet transistor Q1, i.e., pwm pulse is in the Toff cycles, and mosfet transistor Q1, which is in, disconnects shape State.
- A kind of 4. relay drive circuit of pwm pulse control according to claim 1, it is characterised in that：It is described Mosfet transistor Q1 is NMOS triodes either PMOS triodes or IGBT triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721206045.XU CN207338245U (en) | 2017-09-20 | 2017-09-20 | A kind of relay drive circuit of pwm pulse control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721206045.XU CN207338245U (en) | 2017-09-20 | 2017-09-20 | A kind of relay drive circuit of pwm pulse control |
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| Publication Number | Publication Date |
|---|---|
| CN207338245U true CN207338245U (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721206045.XU Active CN207338245U (en) | 2017-09-20 | 2017-09-20 | A kind of relay drive circuit of pwm pulse control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735552A (en) * | 2018-08-17 | 2018-11-02 | 广州金升阳科技有限公司 | The coil control circuit of contactor |
| CN109741991A (en) * | 2018-12-29 | 2019-05-10 | 深圳和而泰智能控制股份有限公司 | A kind of method, apparatus and electronic equipment controlling relay |
| CN110286620A (en) * | 2019-06-15 | 2019-09-27 | 深圳市瑞鼎电子有限公司 | Electric control device on-off control method thereof, storage medium, control device and relay |
-
2017
- 2017-09-20 CN CN201721206045.XU patent/CN207338245U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735552A (en) * | 2018-08-17 | 2018-11-02 | 广州金升阳科技有限公司 | The coil control circuit of contactor |
| CN108735552B (en) * | 2018-08-17 | 2024-01-16 | 广州金升阳科技有限公司 | Coil control circuit of contactor |
| CN109741991A (en) * | 2018-12-29 | 2019-05-10 | 深圳和而泰智能控制股份有限公司 | A kind of method, apparatus and electronic equipment controlling relay |
| CN110286620A (en) * | 2019-06-15 | 2019-09-27 | 深圳市瑞鼎电子有限公司 | Electric control device on-off control method thereof, storage medium, control device and relay |
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