CN209708599U - Electronic guide board soft-start circuit - Google Patents
Electronic guide board soft-start circuit Download PDFInfo
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- CN209708599U CN209708599U CN201920606273.9U CN201920606273U CN209708599U CN 209708599 U CN209708599 U CN 209708599U CN 201920606273 U CN201920606273 U CN 201920606273U CN 209708599 U CN209708599 U CN 209708599U
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- thermistor
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- guide board
- electronic guide
- current
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Abstract
The utility model relates to a kind of start-up circuits, and in particular to a kind of electronic guide board soft-start circuit.The electronic guide board soft-start circuit includes total input terminal X1 and total output end X2, connects current-limiting circuit between total input terminal X1 and total output end X2；The current-limiting circuit includes the first current limliting branch and the second current limliting branch in parallel；The first current limliting branch includes the first thermistor RT1 and the second thermistor RT2, the first end of the first thermistor RT1 connects total input terminal X1, the second end of first thermistor RT1 connects the first end of the second thermistor RT2, and the second end of the second thermistor RT2 connects total output end X2；The second current limliting branch includes connected relay K1, on-off control unit and on-off indicating unit.The electronic guide board soft-start circuit can effective transient suppression starting current so that electronic guide board smooth starting.
Description
Technical field
The utility model relates to a kind of start-up circuits, and in particular to a kind of electronic guide board soft-start circuit.
Background technique
With the development of electronic display technology, electronic guide board has been applied more and more widely in public transport field,
Leading for Dynamically Announce traffic multiplies information, and can show bulletin.It is direct when electronic guide board in the prior art starts
Electronic guide board power supply is supplied electricity to by input power, voltage dropping power supply filter capacitor momentary charge electric current is larger as built in guideboard, from
And it is excessive to will lead to input current moment, and power supply system may be made to generate protection, so as to cause power supply system failure.
Summary of the invention
In order to solve the deficiencies in the prior art, the utility model provides a kind of electronic guide board soft-start circuit, institute
State electronic guide board soft-start circuit, the electronic guide board soft-start circuit can effective transient suppression starting current so that electronics
Guideboard smooth starting.
According to technical solution provided by the utility model, a kind of electronic guide board soft-start circuit, the electronic guide board is slow to be opened
Dynamic circuit includes: total input terminal X1 and total output end X2, connects current-limiting circuit between total input terminal X1 and total output end X2；
The current-limiting circuit includes the first current limliting branch and the second current limliting branch in parallel；
The first current limliting branch includes the first thermistor RT1 and the second thermistor RT2, first thermistor
The first end of RT1 connects total input terminal X1, and the second end of the first thermistor RT1 connects the of the second thermistor RT2
The second end of one end, the second thermistor RT2 connects total output end X2；
The second current limliting branch includes connected relay K1, on-off control unit and on-off indicating unit, described
Relay K1 includes coil b, moving contact a, normally opened contact c and normally-closed contact d；The first end of the coil b connects the dynamic touching
One end of head a, one end of the moving contact a connects the first end of the first thermistor RT1, the normally opened contact c connection
Total output end X2, the normally-closed contact d ground connection.
Further, the on-off control unit includes first resistor R1, described in one end connection of the first resistor R1
The other end of the first end of first thermistor RT1, first resistor R1 is connecting one end of second resistance R2, first capacitor C1 just
One end of pole and 3rd resistor R3；The other end of the second resistance R2 connects the cathode of the first capacitor C1, and described first
The cathode of capacitor C1 is grounded；The grid of the other end connection metal-oxide-semiconductor V1 of the 3rd resistor, the drain electrode connection of the metal-oxide-semiconductor V1
The other end of relay K1 coil b, the source electrode ground connection of the metal-oxide-semiconductor V1.
Further, the on-off indicating unit include the 4th resistance R4, the 4th resistance R4 one end connection described in
The first end of first thermistor RT1, the anode of the other end connection Light-emitting diode LED of the 4th resistance R4, the hair
The anode of the cathode connection first diode D1 of optical diode LED and the second end of relay K1 coil b；The first diode
The cathode of D1 connects the first end of the first thermistor RT1.
Further, fuse F1 is equipped between total input terminal X1 and the first end of the first thermistor RT1.
It can be seen that electronic guide board soft-start circuit provided by the utility model from the above, compared with prior art
Have following advantages: the utility model can effective transient suppression starting current so that electronic guide board smooth starting, transient current
Control in safe range, will not have an impact entire power supply system.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model.
100. current-limiting circuit, 110. first current limliting branches, 120. second current limliting branches, 121. on-off control units,
122. on-off indicating unit.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.Wherein identical components are presented with like reference characters.It needs to illustrate
It is that word "front", "rear" used in the following description, "left", "right", "up" and "down" refer to the direction in attached drawing.It uses
Word "inner" and "outside" refer respectively to the direction towards or away from geometric center of specific component.
The utility model provides a kind of electronic guide board soft-start circuit, as shown in Figure 1, the electronic guide board soft-start circuit
Include: total input terminal X1 and total output end X2, current-limiting circuit 100 is connected between total input terminal X1 and total output end X2；
The current-limiting circuit 100 includes the first current limliting branch 110 and the second current limliting branch 120；
The first current limliting branch 110 includes the first thermistor RT1 and the second thermistor RT2, first temperature-sensitive
The first end of resistance RT1 connects total input terminal X1, and the second end of the first thermistor RT1 connects the second thermistor RT2
First end, the second end of the second thermistor RT2 connects total output end X2；
The input terminal of the second current limliting branch 120 connects total input terminal X1, and the second current limliting branch 120 wraps
Include: relay K1, on-off control unit 121 and on-off indicating unit 122, the on-off control unit 121 is for controlling institute
The connecting and disconnecting of relay K1 are stated, the on-off indicating unit 122 is used to indicate the state of the relay K1.
Relay K1, the relay K1 include coil b, moving contact a, normally opened contact c and normally-closed contact d, the coil b
First end connect one end of the moving contact a, one end of the moving contact a connects the first of the first thermistor RT1
End, the total output end X2 of normally opened contact c connection, the normally-closed contact d ground connection；It is described dynamic when relay coil b is not powered on
The contact a and normally-closed contact d is connected, the normally-closed contact d ground connection.It is to be understood that the normally opened contact c is to work as relay
The stationary contact that device coil b is in an off state when being not powered on, the normally-closed contact d are to be in when relay coil b is not powered on
The stationary contact of on-state.
The on-off control unit 121 includes first resistor R1, one end connection of the first resistor R1 second limit
Flow the input terminal of branch 120, other end connection one end of second resistance R2 of first resistor R1, the anode of first capacitor C1 and the
One end of three resistance R3；The other end of the second resistance R2 connects the cathode of the first capacitor C1, the first capacitor C1
Cathode ground connection；The grid of the other end connection metal-oxide-semiconductor V1 of the 3rd resistor, the drain electrode of the metal-oxide-semiconductor V1 connect relay
The other end of K1 coil b, the source electrode ground connection of the metal-oxide-semiconductor V1.
The on-off indicating unit 122 includes that the first end of the coil b connects one end of the moving contact a, described dynamic
One end of contact a connects the first end of the first thermistor RT1, and the total output end X2 of normally opened contact c connection is described normal
Closed contact d ground connection.
In order to protect the current-limiting circuit 100, set between total input terminal X1 and the first end of the first thermistor RT1
There is fuse F1.
The principles of the present invention are as follows: input power inputs the electronic guide board soft-start circuit by total input terminal X1,
Two the first current limliting branches 110 give voltage dropping power supply built in guideboard to power all the way, and electric current passes through in the first current limliting branch 110
Fuse F1 is exported by total output end X2 in guideboard after the first thermistor RT1 and the second thermistor RT2 current limliting
Voltage dropping power supply power supply is set, guideboard built-in power filter capacitor slowly charges at this time.Another way gives road by the second current limliting branch 120
Voltage dropping power supply built in board is powered, and electric current is divided by first resistor R1 and second resistance R2 in the second current limliting branch 120
It charges afterwards to first capacitor C1, when the voltage at the both ends the first capacitor C1 rises to particular value, by the 3rd resistor
R3 drives the metal-oxide-semiconductor V1 conducting, and the conducting of the metal-oxide-semiconductor V1 is so that the Light-emitting diode LED of on-off indicating unit 122 is sent out
Light, relay K1 are attracted, i.e. the other end of moving contact a connects the normally opened contact c, so that power supply passes through the dynamic touching of relay K1
Head a and normally opened contact c, by X2 output electron guideboard power supply, electronic guide board smooth starting.
The utility model has the advantage of, current-limiting circuit in the utility model can effective transient suppression starting current,
Electronic guide board smooth starting, transient current testing in safe range, will not have an impact entire power supply system.
It should be understood by those ordinary skilled in the art that: the above is only a specific embodiment of the present invention, and
It is not used in the limitation present invention, all any modification, equivalent substitution, improvement and etc. within purport of the invention, done should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of electronic guide board soft-start circuit, which is characterized in that the electronic guide board soft-start circuit includes: total input terminal X1
With total output end X2, current-limiting circuit (100) are connected between total input terminal X1 and total output end X2；
The current-limiting circuit (100) includes the first current limliting branch (110) and the second current limliting branch (120) in parallel；
The first current limliting branch (110) includes the first thermistor RT1 and the second thermistor RT2, the first temperature-sensitive electricity
The first end for hindering RT1 connects total input terminal X1, and the second end of the first thermistor RT1 connects the second thermistor RT2's
The second end of first end, the second thermistor RT2 connects total output end X2；
The second current limliting branch (120) includes connected relay K1, on-off control unit (121) and on-off indicating unit
(122), the relay K1 includes coil b, moving contact a, normally opened contact c and normally-closed contact d；The first end of the coil b connects
One end of the moving contact a is connect, one end of the moving contact a connects the first end of the first thermistor RT1, described normally opened
The total output end X2 of contact c connection, the normally-closed contact d ground connection.
2. electronic guide board soft-start circuit as described in claim 1, which is characterized in that on-off control unit (121) packet
First resistor R1 is included, one end of the first resistor R1 connects the first end of the first thermistor RT1, first resistor R1's
One end, the anode of first capacitor C1 and one end of 3rd resistor R3 of other end connection second resistance R2；The second resistance R2
The other end connect the cathode of the first capacitor C1, the cathode ground connection of the first capacitor C1；The 3rd resistor it is another
The grid of end connection metal-oxide-semiconductor V1, the other end of the drain electrode connection relay K1 coil b of the metal-oxide-semiconductor V1, the metal-oxide-semiconductor V1's
Source electrode ground connection.
3. electronic guide board soft-start circuit as described in claim 1, which is characterized in that on-off indicating unit (122) packet
The 4th resistance R4 is included, one end of the 4th resistance R4 connects the first end of the first thermistor RT1, the 4th resistance
The anode of the other end connection Light-emitting diode LED of R4, the cathode connection first diode D1 of the Light-emitting diode LED is just
The second end of pole and relay K1 coil b；The cathode of the first diode D1 connects the first of the first thermistor RT1
End.
4. electronic guide board soft-start circuit as described in claim 1, which is characterized in that total input terminal X1 and the first temperature-sensitive
Fuse F1 is equipped between the first end of resistance RT1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920606273.9U CN209708599U (en) | 2019-04-29 | 2019-04-29 | Electronic guide board soft-start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920606273.9U CN209708599U (en) | 2019-04-29 | 2019-04-29 | Electronic guide board soft-start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209708599U true CN209708599U (en) | 2019-11-29 |
Family
ID=68649188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920606273.9U Active CN209708599U (en) | 2019-04-29 | 2019-04-29 | Electronic guide board soft-start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209708599U (en) |
-
2019
- 2019-04-29 CN CN201920606273.9U patent/CN209708599U/en active Active
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