CN206100262U - Constant current power supply and TV set - Google Patents
Constant current power supply and TV set Download PDFInfo
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- CN206100262U CN206100262U CN201621112221.9U CN201621112221U CN206100262U CN 206100262 U CN206100262 U CN 206100262U CN 201621112221 U CN201621112221 U CN 201621112221U CN 206100262 U CN206100262 U CN 206100262U
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Abstract
The utility model discloses a constant current power supply and TV set, wherein, constant current power supply includes constant current output circuit, it has the controlled end of start -up and power output end, the current -limiting circuit, the input of current -limiting circuit and constant current output circuit's power output end is connected, the output connected load of current -limiting circuit, current detection circuit, current detection circuit's sense terminal is connected with constant current output circuit's power output end, protection control circuit, protection control circuit's input is connected with current detection circuit's output, and protection control circuit's first control end is connected with the controlled end of constant current output circuit's start -up, wherein, protection control circuit for when the output current that detects constant current output circuit at current detection circuit is greater than predetermined electric current protection threshold value, control constant current output circuit stop work. The utility model discloses technical scheme has the characteristics that the reliability is high.
Description
Technical field
This utility model is related to technical field of television sets, more particularly to a kind of constant current-supplying power supply and television set.
Background technology
Constant current-supplying power supply, is exactly the constant electric current powering load of output size, and its application is widely.However, by
In existing constant current-supplying power supply occur during powering load, usually because wire rod is damaged or other problems and it is defeated
Go out short circuit, cause to load situation about being burned.Therefore, there is the defect of poor reliability in existing constant current-supplying power supply.
Utility model content
Main purpose of the present utility model is to provide a kind of constant current-supplying power supply, it is intended to which that improves the constant current-supplying power supply can
By property.
For achieving the above object, the utility model proposes constant current-supplying power supply, including：Constant current output circuit, it has
Start controlled end and power output end；Current-limiting circuit, the power supply of the input of the current-limiting circuit and the constant current output circuit
Outfan connects, the outfan connection load of the current-limiting circuit；Current detection circuit, the test side of the current detection circuit
It is connected with the power output end of the constant current output circuit；Protection control circuit, the input of the protection control circuit and institute
State the outfan connection of current detection circuit, protection first control end of control circuit and opening for the constant current output circuit
Dynamic controlled end connection；Wherein, the protection control circuit, for detecting the constant current output electricity in the current detection circuit
When the output current on road is more than default current protection threshold value, controls the constant current output circuit and quit work.
Preferably, the constant current-supplying power supply also includes alarm device, the alarm device and the protection control circuit
The second control end connection；The protection control circuit, for detecting the constant current output electricity in the current detection circuit
When the output current on road is more than default current protection threshold value, controls the alarm device and report to the police.
Preferably, the alarm device includes first resistor and light emitting diode, and the anode of the light emitting diode is institute
The controlled end of alarm device is stated, first resistor ground connection described in the negative electrode Jing of the light emitting diode.
Preferably, the current-limiting circuit includes voltage regulation unit, first switch pipe, second resistance and 3rd resistor；Described
The emitter stage of one switching tube is connected with the second end of the second resistance, the first end of the second resistance and the voltage regulation unit
Input connection, its connecting node is the input of the current-limiting circuit；The base stage of the first switch pipe, the voltage stabilizing list
The outfan of unit and the first end interconnection of the 3rd resistor, the second end ground connection of the 3rd resistor, the first switch pipe
The extremely described current-limiting circuit of current collection outfan.
Preferably, the voltage regulation unit includes the first Zener diode, and the negative electrode of first Zener diode is described
The input of voltage regulation unit, the anode of first Zener diode is the outfan of the voltage regulation unit.
Preferably, the current detection circuit include the first power supply, the first optocoupler, the 4th resistance, the 3rd resistor and
First Zener diode, the negative electrode of first Zener diode is the test side of the current detection circuit, described
The anode of one Zener diode is connected with the anode of first optocoupler, and 3rd resistor described in the negative electrode Jing of first optocoupler connects
Ground, the 4th resistance described in the colelctor electrode Jing of first optocoupler is connected with first power supply, the emitter stage of first optocoupler
For the outfan of the current detection circuit.
Preferably, the current detection circuit includes second source and switch element, and the controlled end of the switch element is
The test side of the current detection circuit, the input of the switch element is connected with the outfan of the second source, described
The outfan of switch element is the outfan of the current detection circuit.
Preferably, the switch element includes the second Zener diode, the second optocoupler, the 5th resistance and current-limiting resistance, institute
The negative electrode for stating the second Zener diode is the controlled end of the switch element, the anode of second Zener diode and described
Two optocouplers anode connection, described in the negative electrode Jing of second optocoupler current-limiting resistance ground connection, the colelctor electrode of second optocoupler with
The second end connection of the 5th resistance, the first end of the 5th resistance is the input of the switch element, described second
The outfan of the extremely described switch element of transmitting of optocoupler.
Preferably, the protection control circuit include the 3rd power supply, the first electric capacity, second switch pipe, the 3rd switching tube, the
Six resistance, the 7th resistance, the 8th resistance and the 9th resistance；The first end of the 6th resistance and the current collection of the 3rd switching tube
Pole connect, its connecting node be it is described protection control circuit input, the second end of the 6th resistance, first electric capacity
First end and the second switch pipe base stage interconnection, the transmitting of the second end of first electric capacity and the second switch pipe
Pole is grounded, the first end interconnection of the colelctor electrode of the second switch pipe, the first end of the 7th resistance and the 8th resistance,
The outfan interconnection at second end, the first end of the 9th resistance and the 3rd power supply of the 7th resistance, the described 8th
Second end of resistance is connected with the base stage of the 3rd switching tube, the second end and the 3rd switching tube of the 9th resistance
Emitter stage connects, the first control end of the extremely described protection control circuit of current collection of the 3rd switching tube.
This utility model also proposes a kind of television set, and the television set includes constant current output power supply as above, the perseverance
Stream out-put supply includes：Constant current output circuit, it has startup controlled end and power output end；Current-limiting circuit, the current limliting electricity
The input on road is connected with the power output end of the constant current output circuit, the outfan connection load of the current-limiting circuit；Electricity
Current detection circuit, the test side of the current detection circuit is connected with the power output end of the constant current output circuit；Protection control
Circuit processed, the input of the protection control circuit is connected with the outfan of the current detection circuit, the protection control electricity
First control end on road is connected with the startup controlled end of the constant current output circuit；Wherein, the protection control circuit, for
When the current detection circuit detects the output current of the constant current output circuit more than default current protection threshold value, control
The constant current output circuit quits work.
Technical solutions of the utility model limit the size of current of constant current output circuit output by adopting current-limiting circuit, and
And, when the output current for detecting constant current output circuit in current detection circuit is more than default current protection threshold value, protection control
Circuit processed control constant current output circuit quits work so that constant current-supplying power supply can not only safely powering load, moreover it is possible to
Stop output at once after output short-circuit, reliability is high.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative work
Under, other accompanying drawings can be obtained with the structure according to these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of the embodiment of this utility model constant current-supplying power supply one；
Fig. 2 is the electrical block diagram of the specific embodiment of this utility model constant current-supplying power supply one；
Fig. 3 is the electrical block diagram of this utility model constant current-supplying power supply another specific embodiment.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 100 | Constant current output circuit | R1 | First resistor |
| 200 | Current-limiting circuit | R2 | Second resistance |
| 300 | Current detection circuit | R3 | 3rd resistor |
| 400 | Protection control circuit | R4 | 4th resistance |
| 500 | Alarm device | R5 | 5th resistance |
| 210 | Voltage regulation unit | R6 | 6th resistance |
| 310 | Switch element | R7 | 7th resistance |
| D1 | First Zener diode | R8 | 8th resistance |
| D2 | Second Zener diode | R9 | 9th resistance |
| DL | Light emitting diode | Q1 | First switch pipe |
| U1 | First optocoupler | Q2 | Second switch pipe |
| U2 | Second optocoupler | Q3 | 3rd switching tube |
| C1 | First electric capacity | RS | Current-limiting resistance |
The realization of this utility model purpose, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of this utility model protection.
If it is to be appreciated that the directional instruction of institute in this utility model embodiment (such as upper and lower, left and right, it is front,
It is only used for afterwards ...) explaining in the relative position relation under a certain particular pose (as shown in drawings) between each part, motion feelings
Condition etc., if the particular pose changes, directionality indicates also correspondingly to change therewith.
In addition, the description for being related to " first ", " second " etc. in this utility model is only used for describing purpose, and it is not understood that
To indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ",
At least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the technical side between each embodiment
Case can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme
It will be understood that the combination of this technical scheme is not present when appearance is conflicting or cannot realize, also not in this utility model requirement
Protection domain within.
The utility model proposes a kind of constant current-supplying power supply.
With reference to Fig. 1, in one embodiment, the constant current-supplying power supply includes：Constant current output circuit 100, there is startup to receive for it
Control end and power output end；Current-limiting circuit 200, the input IN of current-limiting circuit and the power output end of constant current output circuit 100
Connection, the outfan OUT connection loads of current-limiting circuit 200；Current detection circuit 300, the test side of current detection circuit 300 with
The power output end connection of constant current output circuit 100；Protection control circuit 400, protects the input and electric current of control circuit 400
The outfan connection of detection circuit 300, the first control end for protecting control circuit 400 is received with the startup of constant current output circuit 100
The connection of control end；Wherein, control circuit 400 is protected, for detecting the defeated of constant current output circuit 100 in current detection circuit 300
When going out electric current more than default current protection threshold value, control constant current output circuit 100 quits work.
When constant current-supplying power initiation, constant current output circuit 100 exports the electric current of constant size.Current-limiting circuit 200 will
The electric current of constant current output circuit output 100 carries out being delivered to load after current limliting process, with the work electricity that proof load obtains safety
Stream.At the same time, the size of current of the detection of current detection circuit 300 constant current output circuit output.If current detection circuit 300 is examined
The electric current of the output of constant current output circuit 100 is measured less than or equal in default current protection threshold range, then protection is controlled
The signal that first control end P output control constant current output circuit 100 of circuit 400 works on, constant current output circuit 100 keeps
Constant current output.If the electric current that current detection circuit 300 detects the output of constant current output circuit 100 is more than default current protection threshold
Value, then protect the out-of-work signal of the first control end P output control constant current output circuit 100 of control circuit 400, and constant current is defeated
Go out circuit 100 and stop output current, constant current-supplying power supply is protected.
Technical solutions of the utility model are big by the electric current that the output of constant current output circuit 100 is limited using current-limiting circuit 200
It is little, also, the output current for detecting constant current output circuit 100 in current detection circuit 300 is more than default current protection threshold
During value, the protection control constant current output circuit 100 of control circuit 400 quits work so that constant current-supplying power supply can not only be safe
Ground powering load, moreover it is possible to stop output at once after output short-circuit, reliability is high.
With reference to Fig. 2, in one embodiment, above-mentioned current-limiting circuit 200 include voltage regulation unit 210, first switch pipe Q1,
Second resistance R2 and 3rd resistor R3；The emitter stage of first switch pipe Q1 is connected with the second end of second resistance R2, second resistance
The first end of R2 is connected with the input of voltage regulation unit 210, and its connecting node is the input IN of current-limiting circuit 200；First opens
Close the first end interconnection of the base stage, the outfan of voltage regulation unit 210 and 3rd resistor R3 of pipe Q1, the second termination of 3rd resistor R3
Ground GND, the colelctor electrode of first switch pipe Q1 is the outfan OUT of current-limiting circuit 200.
When the electric current of input to current-limiting circuit 200 is less than or equal to default current protection threshold value, voltage regulation unit 210
Cut-off, electric current Jing second resistances R2 and first switch pipe Q1 powering loads, load obtains the supply current of safety.When input extremely
When the electric current of current-limiting circuit 200 is more than default current protection threshold value, voltage regulation unit 210 is turned on, and voltage regulation unit 210 maintains its defeated
Enter to hold the voltage of IN to keep constant, and the voltage between the emitter stage and base stage of first switch pipe Q1 is fixed, therefore, second resistance
The voltage at R2 two ends is fixed, and the electric current for flowing through second resistance R2 is fixed, and the electric current of the outfan OUT outputs of current-limiting circuit 200 is consolidated
It is fixed.By the voltage stabilizing value for arranging voltage regulation unit 210, it is ensured that the electric current of the output of current-limiting circuit 200 is less than or equal to electric current
Rotection thresholds.So, when the electric current in the output of constant current output circuit 100 is more than default current protection threshold value, load can be obtained
Obtain the constant supply current of safety.
Wherein, above-mentioned voltage regulation unit 210 can be (not shown by voltage stabilizing adjustment pipe (not shown) and its peripheral circuit
Go out) composition mu balanced circuit, or single Zener diode.Due to single Zener diode have simple structure,
The advantage of low cost, therefore, the present embodiment preferably, above-mentioned voltage regulation unit 210 be the first Zener diode D1, first voltage stabilizing
The negative electrode of diode D1 is the input of voltage regulation unit 210, and the anode of first Zener diode D1 is the defeated of voltage regulation unit 210
Go out end.
With reference to Fig. 2, in one embodiment, above-mentioned current detection circuit 300 includes the first power supply VCC1, the first optocoupler
U1, the 4th resistance R4,3rd resistor R3 and the first Zener diode D1, the negative electrode of the first Zener diode D1 is current detecting electricity
The test side on road 300, the anode of the first Zener diode D1 is connected with the anode of the first optocoupler U1, the negative electrode Jing of the first optocoupler U1
3rd resistor R3 is grounded GND, and the resistance R4 of colelctor electrode Jing the 4th of the first optocoupler U1 are connected with the first power supply VCC1, the first optocoupler U1
Transmitting extremely current detection circuit 300 outfan.
When the electric current of the output of constant current output circuit 100 is less than or equal to default current protection threshold value, the first voltage stabilizing
Diode D1 is not turned on, and the first optocoupler U1 is not turned on, the output low level signal of current detection circuit 300.Work as constant current output circuit
When the electric current of 100 outputs is more than default current protection threshold value, the first Zener diode D1 conductings, the first optocoupler U1 conductings, the
One power supply VCC1 is exported by the first optocoupler U1, the output high level signal of current detection circuit 300.
With reference to Fig. 3, in another specific embodiment, above-mentioned current detection circuit 300 includes second source VCC2 and switch
Unit 310, the controlled end of switch element 310 for current detection circuit 300 test side, the input of switch element 310 and the
The outfan connection of two power supply VCC2, the outfan of switch element 310 is the outfan of current detection circuit 300.
When the electric current of the output of constant current output circuit 100 is less than or equal to default current protection threshold value, switch element
310 cut-offs, the output low level signal of current detection circuit 300；When the electric current of the output of constant current output circuit 100 is more than default electricity
During stream rotection thresholds, switch element 310 is turned on, and second source VCC2 is exported by switch element 310, current detection circuit 300
Output high level signal.
Specifically, above-mentioned switch element 310 includes the second Zener diode D2, the second optocoupler U2, the 5th resistance R5 and limit
The negative electrode of leakage resistance RS, the second Zener diode D2 for switch element 310 controlled end, the anode of the second Zener diode D2 with
Second optocoupler U2 anode connection, the second optocoupler U2 negative electrode Jing current-limiting resistances RS ground connection GND, the colelctor electrode of the second optocoupler U2 with
The second end connection of the 5th resistance R5, the first end of the 5th resistance R5 is the input of switch element 310, and the second optocoupler U2's sends out
Emitter-base bandgap grading is the outfan of switch element 310.
When the electric current of the output of constant current output circuit 100 is less than or equal to default current protection threshold value, the second voltage stabilizing
Diode D2 and the second optocoupler U2 ends, and switch element 310 ends.When the electric current of the output of constant current output circuit 100 is more than default
Current protection threshold value when, the second Zener diode D2 and the second optocoupler U2 are turned on, and switch element 310 is turned on.
With reference to Fig. 2 or Fig. 3, in one embodiment, above-mentioned protection control circuit 400 include the 3rd power supply VCC3,
First electric capacity C1, second switch pipe Q2, the 3rd switching tube Q3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th are electric
Resistance R9；The first end of the 6th resistance R6 is connected with the colelctor electrode of the 3rd switching tube Q3, and its connecting node is protection control circuit 400
Input, second end of the 6th resistance R6, the first end of the first electric capacity C1 and second switch pipe Q2 base stage interconnection, first is electric
Hold second end of C1 and the grounded emitter GND of second switch pipe Q2, the colelctor electrode of second switch pipe Q2, the of the 7th resistance R7
The first end interconnection of one end and the 8th resistance R8, second end of the 7th resistance R7, the first end of the 9th resistance R9 and the 3rd power supply
The outfan interconnection of VCC3, second end of the 8th resistance R8 is connected with the base stage of the 3rd switching tube Q3, and the second of the 9th resistance R9
End is connected with the emitter stage of the 3rd switching tube Q3, and the current collection of the 3rd switching tube Q3 extremely protects the first of control circuit 400 to control
End P.
When the electric current of the output of constant current output circuit 100 is less than or equal to default current protection threshold value, the 3rd switch
The colelctor electrode output low level of pipe Q3, second switch pipe Q2 cut-offs, the 3rd switching tube Q3 cut-offs, the colelctor electrode of the 3rd switching tube Q3
Persistently export low level.When the electric current of the output of constant current output circuit 100 is more than default current protection threshold value, the 3rd switching tube
The colelctor electrode output high level of Q3.At the same time, the first electric capacity C1 is charged by the 6th resistance R6, second switch pipe Q2 conductings,
The base voltage of the 3rd switching tube Q3 is pulled low, and the 3rd switching tube Q3 conductings, the 3rd power supply VCC3 is defeated by the 3rd switching tube Q3
Go out, and maintain second switch pipe Q2 to turn on so that the 3rd switching tube Q3 persistently exports high level.
In one embodiment, above-mentioned constant current-supplying power supply also includes alarm device 500, alarm device 500 and protection
Second control end (the P ends as shown in Figure 2 or Figure 3) connection of control circuit 400；Protection control circuit 400, for examining in electric current
When slowdown monitoring circuit 300 detects the output current of constant current output circuit 100 more than default current protection threshold value, alarm device is controlled
500 report to the police.
Specifically, alarm device 500 is report including the anode of first resistor R1 and light emitting diode DL, light emitting diode DL
The controlled end of alarm device 500, the negative electrode Jing first resistors R1 ground connection GND of light emitting diode DL.In the controlled end of alarm device 500
When receiving high level signal, light emitting diode DL is bright.Certainly, alarm device 500 can also include buzzer, display etc. its
Its device, is not limited herein.
Hereinafter, with reference to Fig. 3, the operation principle of this utility model constant current-supplying power supply is illustrated：
In the constant current-supplying power work course of work：
If the electric current of the output of constant current output circuit 100 is less than or equal to default current protection threshold value,：
Electric current Jing second resistances R2 and first switch pipe Q1 powering loads of the output of constant current output circuit 100.First is steady
Pressure diode D1 cut-offs, the first optocoupler U1 cut-offs, second switch pipe Q2 cut-offs, the base voltage of the 3rd switching tube Q3 is driven high,
3rd switching tube Q3 ends, and the colelctor electrode output low level signal of the 3rd switching tube Q3, light emitting diode DL does not work, and constant current is defeated
Go out circuit 100 and keep work.
If the electric current of the output of constant current output circuit 100 is more than default current protection threshold value,：
First Zener diode D1 is turned on, and the cathode voltage of the first Zener diode D1 is fixed, and first switch pipe Q1's sends out
Pressure drop between emitter-base bandgap grading and base stage is fixed, and the electric current for flowing through second resistance R2 is fixed.The colelctor electrode output peace of first switch pipe Q1
Complete constant electric current powering load.
First optocoupler U1 is turned on, and the first power supply VCC1 is exported by the first optocoupler U1, and the colelctor electrode of the 3rd switching tube Q3 is defeated
Go out high level, light emitting diode DL lights, and constant current output circuit 100 quits work.At the same time, the 3rd power supply VCC3 is by the
Three switching tube Q3 provide base voltage to second switch pipe Q2 so that second switch pipe Q2 is continuously in conducting state, and luminous two
Pole pipe DL continuous illumination.
This utility model also proposes a kind of television set, and the television set includes constant current-supplying power supply as above, the constant current
Concrete structure reference above-described embodiment of power supply, because this television set employs whole technical sides of above-mentioned all embodiments
Case, therefore all beneficial effects that at least technical scheme with above-described embodiment is brought, this is no longer going to repeat them.
Preferred embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited,
It is every under inventive concept of the present utility model, the equivalent structure made using this utility model description and accompanying drawing content is become
Change, or directly/be used in other related technical fields indirectly and be included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of constant current-supplying power supply, it is characterised in that include：
Constant current output circuit, it has startup controlled end and power output end；
Current-limiting circuit, the input of the current-limiting circuit is connected with the power output end of the constant current output circuit, the current limliting
The outfan connection load of circuit；
Current detection circuit, the test side of the current detection circuit is connected with the power output end of the constant current output circuit；
Protection control circuit, the input of the protection control circuit is connected with the outfan of the current detection circuit, described
First control end of protection control circuit is connected with the startup controlled end of the constant current output circuit；Wherein, the protection control
Circuit, the output current for detecting the constant current output circuit in the current detection circuit is more than default current protection
During threshold value, control the constant current output circuit and quit work.
2. constant current-supplying power supply as claimed in claim 1, it is characterised in that the constant current-supplying power supply also includes dress of reporting to the police
Put, the alarm device is connected with the second control end of the protection control circuit；
The protection control circuit, the output current for detecting the constant current output circuit in the current detection circuit is big
When default current protection threshold value, control the alarm device and report to the police.
3. constant current-supplying power supply as claimed in claim 2, it is characterised in that the alarm device includes first resistor and luminous
Diode, the anode of the light emitting diode is the controlled end of the alarm device, described in the negative electrode Jing of the light emitting diode
First resistor is grounded.
4. constant current-supplying power supply as claimed in claim 1, it is characterised in that the current-limiting circuit include voltage regulation unit, first
Switching tube, second resistance and 3rd resistor；The emitter stage of the first switch pipe is connected with the second end of the second resistance, institute
The first end for stating second resistance is connected with the input of the voltage regulation unit, and its connecting node is the input of the current-limiting circuit
End；The first end interconnection of the base stage, the outfan of the voltage regulation unit and the 3rd resistor of the first switch pipe, described the
The second end ground connection of three resistance, the outfan of the extremely described current-limiting circuit of current collection of the first switch pipe.
5. constant current-supplying power supply as claimed in claim 4, it is characterised in that the voltage regulation unit includes the pole of the first voltage stabilizing two
Pipe, the negative electrode of first Zener diode is the input of the voltage regulation unit, and the anode of first Zener diode is
The outfan of the voltage regulation unit.
6. constant current-supplying power supply as claimed in claim 5, it is characterised in that the current detection circuit include the first power supply,
First optocoupler, the 4th resistance, the 3rd resistor and first Zener diode, the negative electrode of first Zener diode is
The test side of the current detection circuit, the anode of first Zener diode is connected with the anode of first optocoupler, institute
State described in the negative electrode Jing of the first optocoupler 3rd resistor ground connection, the 4th resistance described in the colelctor electrode Jing of first optocoupler and described the
One power supply connects, the outfan of the extremely described current detection circuit of transmitting of first optocoupler.
7. constant current-supplying power supply as claimed in claim 1, it is characterised in that the current detection circuit include second source and
Switch element, the controlled end of the switch element is the test side of the current detection circuit, the input of the switch element
It is connected with the outfan of the second source, the outfan of the switch element is the outfan of the current detection circuit.
8. constant current-supplying power supply as claimed in claim 7, it is characterised in that the switch element includes the pole of the second voltage stabilizing two
Pipe, the second optocoupler, the 5th resistance and current-limiting resistance, the negative electrode of second Zener diode is the controlled of the switch element
End, the anode of second Zener diode is connected with the anode of second optocoupler, described in the negative electrode Jing of second optocoupler
Current-limiting resistance is grounded, and the colelctor electrode of second optocoupler is connected with the second end of the 5th resistance, and the of the 5th resistance
One end is the input of the switch element, the outfan of the extremely described switch element of transmitting of second optocoupler.
9. constant current-supplying power supply as claimed in claim 1, it is characterised in that the protection control circuit include the 3rd power supply,
First electric capacity, second switch pipe, the 3rd switching tube, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance；Described 6th
The first end of resistance is connected with the colelctor electrode of the 3rd switching tube, and its connecting node is the input of the protection control circuit
End, the base stage interconnection at second end, the first end of first electric capacity and the second switch pipe of the 6th resistance, described the
Second end of one electric capacity and the grounded emitter of the second switch pipe, it is the colelctor electrode of the second switch pipe, the described 7th electric
The first end interconnection of the first end of resistance and the 8th resistance, the second end of the 7th resistance, the first of the 9th resistance
The outfan interconnection of end and the 3rd power supply, the second end of the 8th resistance is connected with the base stage of the 3rd switching tube,
Second end of the 9th resistance is connected with the emitter stage of the 3rd switching tube, and the current collection of the 3rd switching tube is extremely described
First control end of protection control circuit.
10. a kind of television set, it is characterised in that include the constant current-supplying power supply as described in claim 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621112221.9U CN206100262U (en) | 2016-10-10 | 2016-10-10 | Constant current power supply and TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621112221.9U CN206100262U (en) | 2016-10-10 | 2016-10-10 | Constant current power supply and TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206100262U true CN206100262U (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621112221.9U Expired - Fee Related CN206100262U (en) | 2016-10-10 | 2016-10-10 | Constant current power supply and TV set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466738A (en) * | 2021-05-31 | 2021-10-01 | 广东朝阳电子科技股份有限公司 | Short circuit detection circuit |
| CN117970169A (en) * | 2024-03-29 | 2024-05-03 | 苏州元脑智能科技有限公司 | A power supply short circuit detection circuit and detection method |
-
2016
- 2016-10-10 CN CN201621112221.9U patent/CN206100262U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466738A (en) * | 2021-05-31 | 2021-10-01 | 广东朝阳电子科技股份有限公司 | Short circuit detection circuit |
| CN117970169A (en) * | 2024-03-29 | 2024-05-03 | 苏州元脑智能科技有限公司 | A power supply short circuit detection circuit and detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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