CN208508793U - A kind of relay power supply circuit - Google Patents
A kind of relay power supply circuit Download PDFInfo
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- CN208508793U CN208508793U CN201821039537.9U CN201821039537U CN208508793U CN 208508793 U CN208508793 U CN 208508793U CN 201821039537 U CN201821039537 U CN 201821039537U CN 208508793 U CN208508793 U CN 208508793U
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- relay
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Abstract
The utility model discloses a kind of relay power supply circuit, including power supply unit and control unit, power supply unit is control unit power supply, and control unit is relay power supply；Power supply unit includes BUCK circuit and PWM control module, and PWM control module receives pwm signal and controls the switch state of the switching tube in BUCK circuit, output end of the output end of BUCK circuit as power supply unit.The utility model uses BUCK circuit to provide supply voltage for relay, different voltage can be obtained to match different relays by the duty ratio of switching tube in control BUCK circuit, versatility is good, and different size of supply voltage can be provided in different phase for relay by the duty ratio of switching tube in control BUCK circuit, it can be effectively reduced relay coil loss, improve the reliability and service life of relay.
Description
Technical field
The utility model relates to power electronics field more particularly to a kind of power supply circuits of relay.
Background technique
Relay power supply circuit is as shown in Figure 1, control metal-oxide-semiconductor generally by DSP hair driving signal RLY in the prior art
Q1 (can also be triode) conducting, so that relay K1 coil 1-2 be made to lead to 12V DC electricity, coil generates magnetic force and passes through mechanical knot
Structure is attracted relay K1 contact 3-4；When DSP stops hair driving signal RLY, the electric current on relay K1 coil 1-2 passes through
Diode D1 afterflow, metal-oxide-semiconductor drain electrode on peak voltage it is substantially zeroed；When the electric current on relay K1 coil 1-2 is reduced to one
When definite value, relay K1 contact 3-4 is disconnected.It is the MOS when driving signal RLY stops the advantages of control relay circuit at present
Peak voltage very little on pipe Q1 (or triode) can preferably protect metal-oxide-semiconductor (or triode).But above scheme is scarce
Point is since the supply voltage of relay K1 coil 1-2 is 12V always, and coil power dissipation is higher, causes relay coil fever tight
Weight, has a certain impact to the reliability and service life of relay.
New scheme is formd after having done some improvement in above-mentioned technology, as shown in Fig. 2, when DSP sends out driving signal
After RLY, relay K1 coil 1-2 is powered by 12V first, after a period of time again by addition 6V power supply power supply all the way.It is this
Power supply plan can reduce the power consumption of relay coil, the disadvantage is that needing individually to increase power supply all the way, and because of different relays
The actuation maintenance voltage of device has otherness, needs to adjust supply voltage when applying on other different type relays, cause
The versatility of scheme is poor.
Utility model content
The utility model provides a kind of relay power supply circuit, and big and versatility is lost to solve above-mentioned relay coil
Poor problem.
A kind of relay power supply circuit provided by the utility model, including power supply unit and control unit, power supply unit be
Control unit power supply, control unit are relay power supply；Power supply unit includes BUCK circuit and PWM control module, and PWM controls mould
Block receives pwm signal and controls the switch state of the switching tube in BUCK circuit, and the output end of BUCK circuit is as power supply unit
Output end；Control unit includes resistance R1, resistance R2, resistance R3, switching tube Q1, capacitor C1, capacitor C2, afterflow module,
The first end of middle resistance R1 is the input terminal of control unit, for the driving signal of input relay, the second end of resistance R1 with
The control terminal of the first end of resistance R2, the first end of capacitor C1 and switching tube Q1 is connected；The of the second end of resistance R2, capacitor C1
The output end of two ends and switching tube Q1 are grounded；The input terminal of switching tube Q1 is connected with the first end of afterflow module, and tie point is made
For an output end of control unit, it is connected with the first end of relay coil；The first of the second end of afterflow module, resistance R3
The first end of end and capacitor C2 are connected, another output of the tie point as control unit, the second end with relay coil
It is connected；The second end of capacitor C2 is grounded；The second end of resistance R3 connects power supply unit.
Preferably, BUCK circuit includes capacitor C4, capacitor C5, switching tube Q3, diode D1 and inductance L1, wherein switching tube
The input terminal of Q3 and the first end of capacitor C5 are connected with power supply, the second end ground connection of capacitor C5, the control terminal of switching tube Q3
It is connected with PWM control module, the output end of switching tube Q3 is connected with the first end of the first end of diode D1, inductance L1, inductance
The second end of L1 is connected with the first end of capacitor C4, output end of the tie point as BUCK circuit, the second end of diode D1 and
The second end of capacitor C4 is grounded.
Preferably, PWM control module includes resistance R4, resistance R5, resistance R6, resistance R7, capacitor C3 and switching tube Q2,
Input terminal of the first end of middle resistance R4 as PWM control module, the second end of resistance R4 and first end, the capacitor C3 of resistance R5
First end and switching tube Q2 control terminal be connected, the output of the second end of resistance R5, the second end of capacitor C3 and switching tube Q2
End is grounded, and the input terminal of switching tube Q2 is connected with the first end of resistance R6, the second end of resistance R6 and the first end of resistance R7
It is connected, the second end of output end of the tie point as PWM control module, resistance R7 is connected with the input terminal of switching tube Q3.
Preferably, power supply 12V.
Preferably, afterflow module is diode, and first end of the anode of diode as afterflow module, cathode is as afterflow
The second end of module.
Preferably, afterflow module is resistance.
Preferably, afterflow module includes diode and voltage-stabiliser tube, first end of the anode of diode as afterflow module, yin
Pole is connected with the cathode of voltage-stabiliser tube, second end of the anode of voltage-stabiliser tube as afterflow module.
Preferably, switching tube Q3 is PMOS tube, control terminal of the gate pole of PMOS tube as switching tube Q3, the source electrode of PMOS tube
As the input terminal of switching tube Q3, output end of the drain electrode of PMOS tube as switching tube Q3.
Preferably, switching tube Q2 is NPN type triode, control terminal of the ground level of NPN type triode as switching tube Q2, collection
Input terminal of the electrode as switching tube Q2, output end of the emitter as switching tube Q2.
The utility model uses BUCK circuit to provide supply voltage for relay, passes through switching tube in control BUCK circuit
Different voltage can be obtained to match different relays in duty ratio, and versatility is good, and by switching in control BUCK circuit
The duty ratio of pipe can provide different size of supply voltage in different phase for relay, can be effectively reduced relay coil damage
Consumption, improves the reliability and service life of relay.
Detailed description of the invention
In order to illustrate more clearly of the utility model embodiment technical solution, will make below to required in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of schematic diagram of relay power supply circuit in the prior art；
Fig. 2 is another schematic diagram of relay power supply circuit in the prior art；
Fig. 3 is a kind of schematic diagram of relay power supply circuit provided by the utility model；
Fig. 4 is the schematic diagram of another relay power supply circuit provided by the utility model；
Fig. 5 is the schematic diagram of another relay power supply circuit provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that the embodiments are a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 3, the utility model provides a kind of relay power supply circuit, including power supply unit and control unit, supplies
Electric unit is control unit power supply, and control unit is relay power supply.Power supply unit includes BUCK circuit and PWM control module,
PWM control module receives pwm signal and controls the switch state of the switching tube in BUCK circuit, the output end conduct of BUCK circuit
The output end of power supply unit.
Control unit includes resistance R1, resistance R2, resistance R3, switching tube Q1, capacitor C1, capacitor C2, afterflow module, wherein
The first end of resistance R1 is the input terminal of control unit, for the driving signal of input relay, the second end and electricity of resistance R1
The control terminal for hindering the first end of R2, the first end of capacitor C1 and switching tube Q1 is connected；The second of the second end of resistance R2, capacitor C1
The output end of end and switching tube Q1 are grounded；The input terminal of switching tube Q1 is connected with the first end of afterflow module, tie point conduct
One output end of control unit, is connected with the first end of relay coil；Second end, the first end of resistance R3 of afterflow module
And the first end of capacitor C2 is connected, another output of the tie point as control unit, the second end phase with relay coil
Even；The second end of capacitor C2 is grounded；The second end of resistance R3 connects power supply unit.
The utility model uses BUCK circuit to provide supply voltage for relay, passes through switching tube in control BUCK circuit
Different voltage can be obtained to match different relays in duty ratio, and versatility is good, and by switching in control BUCK circuit
The duty ratio of pipe can provide different size of supply voltage in different phase for relay, can be effectively reduced relay coil damage
Consumption, improves the reliability and service life of relay.
BUCK circuit includes capacitor C4, capacitor C5, switching tube Q3, diode D1 and inductance L1, and wherein switching tube Q3's is defeated
The first end for entering end and capacitor C5 is connected with power supply, and the second end ground connection of capacitor C5, the control terminal and PWM of switching tube Q3 is controlled
Molding block is connected, and the output end of switching tube Q3 is connected with the first end of the cathode of diode D1, inductance L1, the second end of inductance L1
It is connected with the first end of capacitor C4, output end of the tie point as BUCK circuit, the second of the anode of diode D1 and capacitor C4
End is grounded.
In the present embodiment, switching tube Q3 is PMOS tube, control terminal of the gate pole of PMOS tube as switching tube Q3, PMOS tube
Input terminal of the source electrode as switching tube Q3, output end of the drain electrode of PMOS tube as switching tube Q3.Switching tube Q3 can also be
Other devices with switching function.
In the present embodiment, power supply can adjust according to the actual situation, as relay needs supply voltage to be offered
For 12V and 6V, then power supply is chosen as 12V.If relay needs to provide the voltage of 24V, then power supply is chosen as 12V,
Herein with no restrictions.
PWM control module includes resistance R4, resistance R5, resistance R6, resistance R7, capacitor C3 and switching tube Q2, wherein resistance
The first of the first end of input terminal of the first end of R4 as PWM control module, the second end of resistance R4 and resistance R5, capacitor C3
The control terminal of end and switching tube Q2 are connected, and the output end of the second end of resistance R5, the second end of capacitor C3 and switching tube Q2 connects
The input terminal on ground, switching tube Q2 is connected with the first end of resistance R6, and the second end of resistance R6 is connected with the first end of resistance R7, even
The second end of output end of the contact as PWM control module, resistance R7 is connected with the input terminal of switching tube Q3.
In the present embodiment, switching tube Q2 is NPN type triode, control of the ground level of NPN type triode as switching tube Q2
End processed, input terminal of the collector as switching tube Q2, output end of the emitter as switching tube Q2.Switching tube Q2 can also be it
He has the device of switching function.
Illustrate the principle of relay power supply circuit provided by the utility model below with reference to Fig. 3.Believe in the driving of relay
Before number RLY is issued, the duty ratio for controlling the pwm signal of driving switch pipe Q3 in BUCK circuit is 100%, and switching tube Q2 is normal at this time
Logical, the driving voltage of switching tube Q3 is -12V, and since switching tube Q3 is PMOS tube, switching tube Q3 is also normal open, at this time
BUCK circuit output 12V, 12V voltage is charged by resistance R3 to capacitor C2.When relay driving signal RLY issue moment,
The voltage of relay K1 coil 1-2 is provided by capacitor C2, and capacitor C2 electric discharge, the contact relay K1 3-4 is attracted at this time.By several millis
After second, the duty ratio for controlling the pwm signal of driving switch pipe Q3 in BUCK circuit becomes 50%, at this time BUCK circuit output voltage
For 6V, the voltage of relay K1 coil 1-2 is 6V.From the foregoing, it will be observed that passing through the PWM letter of driving switch pipe Q3 in control BUCK circuit
Number duty ratio can provide different size of supply voltage in different phase for relay, relay coil can be effectively reduced
Loss, improves the reliability and service life of relay.Moreover, passing through driving switch pipe in control BUCK circuit by taking Fig. 3 as an example
The duty ratio of the pwm signal of Q3, exportable different size of voltage can be adapted for the difference that supply voltage requirement is less than 12V
The relay of type, versatility are good；If you need to export bigger voltage, such as the voltage of 24V, the size of power supply can adjust
Match further types of relay.
In the present embodiment, there are many forms of the composition for afterflow module.A kind of afterflow module that form is as shown in Figure 3 is two poles
First end of the anode of pipe D2, diode D2 as afterflow module, second end of the cathode as afterflow module.Another form is such as
Afterflow module shown in Fig. 4 is resistance R8.Another form afterflow module as shown in Figure 5 includes diode D2 and voltage-stabiliser tube
First end of the anode of Z1, diode D2 as afterflow module, cathode are connected with the cathode of voltage-stabiliser tube Z1, and the anode of voltage-stabiliser tube is made
For the second end of afterflow module.
The above is only the specific embodiments of the utility model, and but protection scope of the utility model is not limited thereto,
Anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in various equivalent
Modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.
Claims (9)
1. a kind of relay power supply circuit, which is characterized in that including power supply unit and control unit, said supply unit is described
Control unit power supply, described control unit are relay power supply；
Said supply unit includes BUCK circuit and PWM control module, and the PWM control module receives pwm signal and controls
The switch state of switching tube in BUCK circuit, output end of the output end of the BUCK circuit as said supply unit；
Described control unit includes resistance R1, resistance R2, resistance R3, switching tube Q1, capacitor C1, capacitor C2, afterflow module, wherein
The first end of the resistance R1 is the input terminal of described control unit, for the driving signal of input relay, the resistance R1
Second end be connected with the control terminal of the first end of the resistance R2, the first end of the capacitor C1 and the switching tube Q1；Institute
The output end for stating the second end of resistance R2, the second end of the capacitor C1 and the switching tube Q1 is grounded；The switching tube Q1
Input terminal be connected with the first end of the afterflow module, an output end of the tie point as described control unit, with relay
The first end of device coil is connected；The first of the second end of the afterflow module, the first end of the resistance R3 and the capacitor C2
End is connected, and another output of the tie point as described control unit is connected with the second end of relay coil；The capacitor
The second end of C2 is grounded；The second end of the resistance R3 connects power supply unit.
2. relay power supply circuit according to claim 1, which is characterized in that the BUCK circuit includes capacitor C4, electricity
Hold C5, switching tube Q3, diode D1 and inductance L1, wherein the first end and power supply of the input terminal of switching tube Q3 and capacitor C5
It is connected, the second end ground connection of capacitor C5, the control terminal of the switching tube Q3 is connected with the PWM control module, the switching tube
The output end of Q3 is connected with the first end of the cathode of the diode D1, the inductance L1, the second end and electricity of the inductance L1
The first end for holding C4 is connected, output end of the tie point as the BUCK circuit, the anode and the capacitor of the diode D1
The second end of C4 is grounded.
3. relay power supply circuit according to claim 2, which is characterized in that the PWM control module include resistance R4,
Resistance R5, resistance R6, resistance R7, capacitor C3 and switching tube Q2, wherein the first end of the resistance R4 controls mould as the PWM
The input terminal of block, the second end of the resistance R4 and the first end of the resistance R5, the first end of the capacitor C3 and described is opened
The control terminal for closing pipe Q2 is connected, the output of the second end of the resistance R5, the second end of the capacitor C3 and the switching tube Q2
End is grounded, and the input terminal of the switching tube Q2 is connected with the first end of the resistance R6, the second end of the resistance R6 and institute
The first end for stating resistance R7 is connected, output end of the tie point as the PWM control module, the second end of the resistance R7 and institute
The input terminal for stating switching tube Q3 is connected.
4. relay power supply circuit according to claim 2, which is characterized in that the power supply is 12V.
5. relay power supply circuit according to claim 1, which is characterized in that the afterflow module is diode, two poles
First end of the anode of pipe as the afterflow module, second end of the cathode as the afterflow module.
6. relay power supply circuit according to claim 1, which is characterized in that the afterflow module is resistance.
7. relay power supply circuit according to claim 1, which is characterized in that the afterflow module includes diode and steady
Pressure pipe, first end of the anode of diode as the afterflow module, cathode are connected with the cathode of voltage-stabiliser tube, the anode of voltage-stabiliser tube
Second end as the afterflow module.
8. relay power supply circuit according to claim 2, which is characterized in that the switching tube Q3 is PMOS tube, PMOS
Control terminal of the gate pole of pipe as the switching tube Q3, input terminal of the source electrode of PMOS tube as the switching tube Q3, PMOS tube
Output end of the drain electrode as the switching tube Q3.
9. relay power supply circuit according to claim 3, which is characterized in that the switching tube Q2 is NPN type triode,
Control terminal of the ground level of NPN type triode as the switching tube Q2, input terminal of the collector as the switching tube Q2, transmitting
Output end of the pole as the switching tube Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821039537.9U CN208508793U (en) | 2018-06-29 | 2018-06-29 | A kind of relay power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821039537.9U CN208508793U (en) | 2018-06-29 | 2018-06-29 | A kind of relay power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208508793U true CN208508793U (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821039537.9U Active CN208508793U (en) | 2018-06-29 | 2018-06-29 | A kind of relay power supply circuit |
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| CN (1) | CN208508793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410098A (en) * | 2021-06-30 | 2021-09-17 | 中车株洲电力机车研究所有限公司 | Safe drive circuit of relay |
-
2018
- 2018-06-29 CN CN201821039537.9U patent/CN208508793U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410098A (en) * | 2021-06-30 | 2021-09-17 | 中车株洲电力机车研究所有限公司 | Safe drive circuit of relay |
| CN113410098B (en) * | 2021-06-30 | 2022-07-19 | 中车株洲电力机车研究所有限公司 | Safe drive circuit of relay |
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