CN106163046B - A kind of LED power with short-circuit protection - Google Patents
A kind of LED power with short-circuit protection Download PDFInfo
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- CN106163046B CN106163046B CN201510206199.8A CN201510206199A CN106163046B CN 106163046 B CN106163046 B CN 106163046B CN 201510206199 A CN201510206199 A CN 201510206199A CN 106163046 B CN106163046 B CN 106163046B
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- pressure source
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- 238000005070 sampling Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 35
- 239000004065 semiconductor Substances 0.000 claims description 21
- 230000001681 protective effect Effects 0.000 claims description 13
- 230000005611 electricity Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
A kind of LED power with short-circuit protection, including a constant pressure source and a DC/DC module coupled with the constant pressure source.The DC/DC module includes a DC/DC chip unit.The LED power with short-circuit protection is further included one and couples with the constant pressure source and be electrically connected between constant pressure source and first switch tube with the first switch tube of the constant voltage output of the on-off constant pressure source and one with the switch control module for controlling the first switch tube.The DC/DC module further includes a sampling resistor unit and a second switch.The sampling resistor unit exports low level signal in DC/DC chip unit short circuit.Second switch cut-off when receiving the low level signal.The switch control module turns off the first switch tube when the second switch is ended to close the constant voltage output of the constant pressure source.The constant voltage output that there is the present invention LED power of short-circuit protection constant pressure source can be closed in DC/DC chip unit short circuit, to avoid burning LED load.
Description
Technical field
The present invention relates to a kind of LED power, especially a kind of LED power with short-circuit protection.
Background technique
Due to LED(Light Emitting Diode, light emitting diode) have many advantages, such as that light efficiency is high, light-gathering is good, because
And LED illumination is promoted and applied rapidly.Meanwhile LED have one-way conduction, and can only DC driven and need mutually should be able to produce
The power supply of raw direct current is driven.Thus, LED power also obtains correspondingly fast-developing.The positive volt-ampere having due to LED
Characteristic curve is very steep, i.e., when voltage change is very small, corresponding curent change very can influence LED and work normally greatly, thus
Constant pressure input is generally used to be converted into the DC/DC chip unit of constant current output to realize the control to output electric current in the prior art
And it ensures LED and works normally.And when the failure of DC/DC chip unit, when for example short circuit occurs for the DC/DC, the DC/DC chip list
Member is unable to normal control output electric current, and causes input voltage to be loaded directly into LED load and LED load heating is caused to burn
It ruins.
Summary of the invention
Directly add in view of this, the present invention provides one kind and provides to protect in DC/DC module short circuit to avoid input voltage
The LED power with short-circuit protection being loaded on LED, to solve the above technical problems.
A kind of LED power with short-circuit protection, including a constant pressure source and a DC/ coupled with the constant pressure source
DC module.The DC/DC module includes the DC/DC chip unit that constant pressure input is changed into constant current output.It is described have it is short
The LED power of road protection further includes one and couples with the constant pressure source with the first switch tube of the output of the on-off constant pressure source, with
And one be electrically connected between the constant pressure source and the first switch tube for controlling opening for the first switch tube on-off
Close control module.The DC/DC module further includes the sampling resistor unit being electrically connected with the DC/DC chip unit,
An and second switch being electrically connected with the sampling resistor unit.The sampling resistor unit is in the DC/DC chip
Low level signal is exported when unit short circuit.Second switch cut-off when receiving the low level signal.The switch
Control module turns off the first switch tube when the second switch is ended to close the constant voltage output of the constant pressure source.
Compared with prior art, the present invention has the LED power of short-circuit protection in DC/DC chip unit short circuit, described
Switch control module to disconnect with the first switch tube that the DC/DC module is electrically connected, to close the constant pressure source
Constant voltage output is to avoid the voltage that constant pressure source exports is loaded directly on LED and LED overheat is caused even to burn.
Detailed description of the invention
The embodiment of the present invention is described below in conjunction with attached drawing, in which:
Fig. 1 is a kind of schematic diagram of the LED power with short-circuit protection provided by the invention.
Fig. 2 is the circuit diagram of the LED power shown in FIG. 1 with short-circuit protection.
Specific embodiment
Specific embodiments of the present invention are further elaborated below based on attached drawing.It should be understood that herein
The explanation of the embodiment of the present invention is not intended to limit the scope of protection of the present invention.
Referring to Fig. 1, it is a kind of schematic diagram of the LED power 100 with short-circuit protection provided by the invention.The tool
Have short-circuit protection LED power 100 include a constant pressure source 10, a DC/DC module 20 coupled with the constant pressure source 10, one
It is electrically connected with the DC/DC module 20 with the first switch tube 30 of the constant pressure input of the on-off DC/DC module 20 and one
It is electrically connected between the constant pressure source 10 and the first switch tube 30 with the switch control for controlling the first switch tube 30
Molding block 40.
The constant pressure source 10 is used to power to the entire LED power 100 with short-circuit protection as stable power source.Institute
Stating constant pressure source 10 can be the power supply of any output constant pressure, it might even be possible to be dry cell.In the present embodiment, the constant pressure source 10
Export the constant pressure of 24V.Type, parameter of the constant pressure source 10 etc. are all technology known by those skilled in the art, herein
It repeats no more.
Referring to Figure 2 together, the DC/DC module 20 includes the DC/DC that constant pressure input is changed into constant current output
Chip unit 21, a sampling resistor unit 22 being electrically connected with the DC/DC chip unit 21 and one and the sampling
The second switch 23 that resistance unit 22 is electrically connected.It is envisioned that the DC/DC chip unit 21 includes a DC/
DC chip and with the matched peripheral circuit of DC/DC chip, to export stable DC stream to drive LED load.When
When the model difference of DC/DC chip, so that the peripheral circuit that the DC/DC chip works normally is also corresponding different.The DC/DC core
Model, the working principle of piece are all technology known by those skilled in the art.In the present embodiment, the DC/DC chip N1
Model AL8807.It is envisioned that there are many reasons of 21 short circuit of DC/DC chip unit, it is possible to due to DC/
DC chip itself is short-circuit, it is also possible to peripheral circuit short circuit of DC/DC chip etc..In the present embodiment, the DC/DC chip list
The reason of 21 short circuit of member may be DC/DC chip unit N1 internal short circuits and cause the chip foot 1 and chip for output
Foot 2 is shorted or supply pin 5 is shorted with grounding leg 2, it is also possible to be DC/DC chip N1 itself for sampling to control output electric current
Resistance R9 and/or R10 short circuit and cause the DC/DC chip N1 chip foot 4 and chip foot 5 to be shorted, it is also possible to be peripheral electricity
For pressure stabilizing, the capacitor C2 of filtering and/or capacitor C3 short circuit etc. in road.The reason of 21 short circuit of the DC/DC chip unit is not
Emphasis of the present invention, details are not described herein again.The sampling resistor unit 22 exports low in 21 short circuit of DC/DC chip unit
Level is so that the second switch 23 is ended.In the present embodiment, the sampling resistor unit 22 is adopted including one first
Sample resistance 221 and one and concatenated second sampling resistor 222 of the first sampling resistor 221.As shown in Fig. 2, described first
Sampling resistor 221 is a resistance R11, and second sampling resistor 222 is a resistance R12.It is envisioned that the electricity
The resistance value size of resistance R11 and resistance R12 is arranged according to the size of sampled signal.The second switch 23 and DC/DC
Chip unit 21 couples and ends in 21 short circuit of DC/DC chip unit.The second switch 23 is electrically connected at described
Between first sampling resistor R11 and the second sampling resistor R12.The second switch 23 can be a triode,
It can be metal-oxide-semiconductor (Metal-Oxide-Semiconductor, metal oxide semiconductor field effect tube) etc..For essence
The considerations of factors such as simple layout-design and reduction power consumption, in the present embodiment, the second switch 23 is a N-type metal-oxide-semiconductor
Q2.The grid of N-type metal-oxide-semiconductor Q2 is coupled with the DC/DC chip unit 21, and drain electrode electrically connects with the switch control module 40
It connects, source electrode ground connection.It may occur to persons skilled in the art that as long as related circuit Butut matched design, the second switch
Pipe 23 can be p-type metal-oxide-semiconductor.
The first switch tube 30 and the DC/DC module 20 are electrically connected defeated with the constant pressure of the on-off DC/DC module 20
Enter.The first switch tube 30 by the switch control module 40 control and in 21 short circuit of the DC/DC chip unit
It turns off to close the constant voltage output of the constant pressure source 10.For the considerations of simplifying layout-design, in the present embodiment, described first
Switching tube 30 is a p-type metal-oxide-semiconductor Q1.Output end of the source electrode, drain series of p-type metal-oxide-semiconductor Q1 in the constant pressure source 10, grid
Pole and the switch control module 40 are electrically connected.If it is envisioned that related circuit Butut matched design, described first
Switching tube 30 can be N-type metal-oxide-semiconductor.
The switch control module 40 is electrically connected between the constant pressure source 10 and the first switch tube 30.It is described to open
Control module 40 is closed to turn off the first switch tube 30 when the second switch 23 is ended and reduce the DC/DC module 20
Constant pressure input.In the present embodiment, the switch control module 40 includes the output end for being connected in parallel on the constant pressure source 10
Anode the first charging resistor 41, one connect with first charging resistor 41 again with the concatenated electricity of cathode of the constant pressure source 10
Hold 42.The anode of the capacitor 42 is electrically connected between the first switch tube 30 and the second switch 23.Described first
Charging resistor 41 is used to charge to the capacitor 42.The capacitor 42 makes described in 21 short circuit of DC/DC chip unit
Second switch 23 charges to the threshold voltage that 42 cathode voltage of capacitor is greater than the first switch tube 30 when ending.I.e. in institute
When stating 21 short circuit of DC/DC chip unit and the second switch 23 being ended, the capacitor 42 charges by described first
Resistance 41 charges.The capacitor 42 is greater than the threshold value electricity of the first switch tube 30 in the cathode voltage for charging to the capacitor 42
When pressure, so that the first switch tube 30 is turned off to reduce the input voltage of the DC/DC module 20.The capacitor 42 is described
42 cathode voltage of capacitor is reduced with always to discharge with the second switch 23 forming circuit when second switch 23 is connected
Lower than the threshold voltage of the first switch tube 30.It is envisioned that the switch control module 40 can also use monolithic
The devices such as machine realize the control to the first switch tube 30.In the present embodiment, the capacitor 42 is a capacitor C1.
Please continue to refer to Fig. 2, further, the switch control module 40 further includes one and is electrically connected at the capacitor
The second discharge resistance 43 between 42 and the second switch 23.Second discharge resistance 43 is used to put for the capacitor 42
Electricity.Second discharge resistance 43 is when the second switch 23 is connected with the capacitor 42 forming circuit for the capacitor 42
Electric discharge, to make the capacitor 42 load in the first switch tube 30 when the DC/DC chip unit 21 works normally
Voltage be consistently lower than the threshold voltage of the first switch tube 30.
In addition, the switch control module 40 further includes the third current limliting being electrically connected with the first switch tube 30
Resistance 44.In the present embodiment, the grid of the third current-limiting resistance 44 and the p-type metal-oxide-semiconductor of the first switch tube 30 is electrical
Connection.The third current-limiting resistance 44 is used for current limliting so that the first switch tube 30 works normally.
Further, the switch control module 40 further includes first protective resistance 45.First protective resistance 45
One end and 42 anode of the capacitor be electrically connected, and the other end is electrically connected at the first switch tube 30 and described second and opens
It closes between pipe 23.First protective resistance 45 is damaged described first and is opened for preventing the constant pressure source 10 from generating instantaneous pressure
Close pipe 30.When moment is connected in the constant-current source 10, the capacitor 42 charges not yet and is equivalent to short circuit so that first opens
It closes pipe 30 and 10 cathode of constant-current source is electrically connected, so that voltage drop of the load in the first switch tube 30 is excessive and exceeds
Safe range.First protective resistance 45 can connect partial pressure with first charging resistor 41.Thus, it is opened described first
The grid for closing the p-type metal-oxide-semiconductor Q1 of pipe 30 is connected to energy when between first charging resistor 41 and first protective resistance 45
The potential difference between the p-type metal-oxide-semiconductor Q1 grid and source electrode is reduced, so that p-type metal-oxide-semiconductor Q1 can be connected in constant pressure source 10
Moment is from impacting with high pressure.
In addition, the switch control module 40 further includes second protective resistance 46.Second protective resistance 46 series connection
When the output head anode of the constant pressure source 10 is grounded with short-circuit in the supply pin of the DC/DC chip unit 21 described in protection
First switch tube 30.The DC/DC chip unit 21 supply pin short circuit and when being grounded, can make through the first switch
The electric current of pipe 30 increased dramatically.Thus, second protective resistance 46 can be blown and breaking when high current is passed through, to keep away
Exempt from the first switch tube 30 to burn.
It should be noted that as shown in Fig. 2, in the present embodiment, first charging resistor 41 is a resistance R2, institute
Stating the second discharge resistance 43 is a resistance R5, and the third current-limiting resistance 44 is a resistance R4, first protective resistance
45 be a resistance R3, and second protective resistance 46 is a resistance R1.In order to simplify layout-design, the different function of above-mentioned realization
The resistance of energy is only with a resistance.It is envisioned that above-mentioned resistance can also be passed through in series and parallel using multiple resistance
Mode obtains specific resistance value to realize corresponding function.
Further, the LED power 100 with short-circuit protection is a dimming power source.In the present embodiment, described
LED power 100 with short-circuit protection includes one and is electrically connected at the light modulation foot of the DC/DC chip unit 21 for real
The light-adjusting module 50 now dimmed.As shown in Fig. 2, in the present embodiment, the light-adjusting module 50 includes one and DC/DC chip N1
The light modulation foot 3 metal-oxide-semiconductor Q3 that is electrically connected, one with metal-oxide-semiconductor Q3 electric connection with the capacitor C4 of soft start metal-oxide-semiconductor Q3,
The one diode D1 and three resistance R6, R7 and R8 for partial pressure for counnter attack.
In the present embodiment, the working principle of the LED power 100 with short-circuit protection is as follows: the DC/DC chip
When 21 short circuit of unit, the sampling resistor unit 22 in parallel with the DC/DC chip unit 21 is short-circuit and exports low level signal, thus
So that the second switch 23 ends and is formed into a loop the capacitor 42 with the first switch tube 30.Described first fills
Resistance 41 is to the capacitor 42 charging until the voltage of 42 anode of capacitor is greater than the p-type metal-oxide-semiconductor of the first switch tube 30
When the grid and source voltage difference of Q1, which turns off and closes the constant voltage output of the constant pressure source 10, to drop
There is the output electric current of the LED power 100 of short-circuit protection to avoid LED load is burnt described in low.The DC/DC chip unit 21
When normal work and when exporting square-wave voltage, the sampling resistor unit 22 follows the square-wave voltage and alternately exports high and low
Level signal, so that the second switch 23 follows the high and low level signal and on, off.The capacitor 42 exists
It is formed into a loop and discharges with second discharge resistance 43 when the second switch 23 is connected, and turned off in second switch 23
When pass through first charging resistor 41 charge.Thus, which cannot charge in charge and discharge alternation procedure always
It is greater than the threshold voltage of the first switch tube 30 to the cathode voltage of the capacitor 42, so that at the first switch tube 30
Meet the 100 normal work demand of LED power with short-circuit protection on state.
Compared with prior art, the present invention has the LED power 100 of short-circuit protection in 21 short circuit of DC/DC chip unit,
The switch control module 40 to disconnect with the first switch tube 30 that the DC/DC module 20 is electrically connected, to close institute
The constant voltage output of constant pressure source 10 is stated to avoid the voltage that the constant pressure source 10 exports is loaded directly on LED and causes LED overheat very
To burning.
The foregoing is merely a prefered embodiment of the invention, is not used to limitation protection scope of the present invention, any in the present invention
Modification, equivalent replacement or improvement in spirit etc., all cover in scope of the presently claimed invention.
Claims (9)
1. a kind of LED power with short-circuit protection, including a constant pressure source and a DC/DC coupled with the constant pressure source
Module, the DC/DC module include the DC/DC chip unit that constant pressure input is changed into constant current output, it is characterised in that: institute
It states the LED power with short-circuit protection and further includes one and couple with the constant pressure source and opened with the first of the output of the on-off constant pressure source
Guan Guan and one is electrically connected between the constant pressure source and the first switch tube with logical for controlling the first switch tube
Disconnected switch control module, the DC/DC module further include the sampling resistor being electrically connected with the DC/DC chip unit
Unit and a second switch being electrically connected with the sampling resistor unit, the sampling resistor unit is in the DC/DC
Low level signal is exported when chip unit short circuit, second switch cut-off when receiving the low level signal is described
Switch control module turns off the first switch tube when the second switch is ended to close the output of the constant pressure source；Institute
State the first charging resistor that switch control module includes the output head anode for being connected in parallel on the constant pressure source, one with this first
The capacitor in parallel with the cathode of the constant pressure source, the anode of the capacitor are electrically connected at the first switch again for charging resistor series connection
Between pipe and second switch, first charging resistor is used for the capacitor charging, and the capacitor is in the DC/DC chip
Unit is short-circuit and the second switch is made to charge to the threshold that the capacitance cathode voltage is greater than the first switch tube when ending
Threshold voltage so that the first switch tube end, the DC/DC module work normally when output square-wave voltage and make this second
Switching tube follows the square-wave voltage and on-off, the capacitor are formed back when the second switch is connected with the second switch
Threshold voltage that road reduces the capacitance cathode voltage to discharge to be consistently lower than the first switch tube is so that this first is opened
Close pipe conducting.
2. the LED power according to claim 1 with short-circuit protection, it is characterised in that: the switch control module is also
The second discharge resistance being electrically connected between the capacitor and the second switch including one, second discharge resistance are used
It discharges in for the capacitor.
3. the LED power according to claim 1 with short-circuit protection, it is characterised in that: the switch control module is also
The third current-limiting resistance being electrically connected between the first switch tube and the capacitor including one.
4. the LED power according to claim 1 with short-circuit protection, it is characterised in that: the switch control module is also
It is electrical with the first switch tube again after first protective resistance and capacitor electric connection including first protective resistance
Connection is to prevent the constant pressure source from generating instantaneous pressure to damage the first switch tube.
5. the LED power according to claim 1 with short-circuit protection, it is characterised in that: the switch control module is also
Including second protective resistance, which is connected on the output head anode of the constant pressure source in the DC/DC
The supply pin short circuit of chip unit and while being grounded, protects the first switch tube.
6. the LED power according to claim 1 with short-circuit protection, it is characterised in that: described with short-circuit protection
LED power is a dimming power source.
7. LED power according to claim 1, it is characterised in that: the sampling resistor unit includes one first sampling
Resistance and one and concatenated second sampling resistor of first sampling resistor, the second switch are electrically connected at described
Between first sampling resistor and second sampling resistor.
8. LED power according to claim 1, it is characterised in that: the first switch tube is a p-type metal-oxide-semiconductor, the P
In the output end of the constant pressure source, grid and the switch control module are electrically connected for the source electrode of type metal-oxide-semiconductor, drain series.
9. the LED power according to claim 1 with short-circuit protection, it is characterised in that: the second switch is one
A N-type metal-oxide-semiconductor, the grid of the N-type metal-oxide-semiconductor and the sampling resistor unit are electrically connected, drain electrode and the switch control module
It is electrically connected, source electrode ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510206199.8A CN106163046B (en) | 2015-04-28 | 2015-04-28 | A kind of LED power with short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510206199.8A CN106163046B (en) | 2015-04-28 | 2015-04-28 | A kind of LED power with short-circuit protection |
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| Publication Number | Publication Date |
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| CN106163046A CN106163046A (en) | 2016-11-23 |
| CN106163046B true CN106163046B (en) | 2018-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510206199.8A Active CN106163046B (en) | 2015-04-28 | 2015-04-28 | A kind of LED power with short-circuit protection |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2020155203A (en) * | 2019-03-18 | 2020-09-24 | セイコーエプソン株式会社 | Light emission control device, light source device and projection type video display device |
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|---|---|---|---|---|
| CN101720147A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN202009225U (en) * | 2011-03-09 | 2011-10-12 | 深圳创维数字技术股份有限公司 | Boosting DC-DC short-circuit protection circuit |
| CN202145692U (en) * | 2011-07-28 | 2012-02-15 | 林万炯 | LED flicker filter circuit |
| CN103683215A (en) * | 2012-09-20 | 2014-03-26 | 林万炯 | Short-circuit protection circuit of electronic switch |
| CN204652731U (en) * | 2015-04-28 | 2015-09-16 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348310B (en) * | 2010-08-03 | 2013-08-14 | 英飞特电子（杭州）股份有限公司 | Multi-path LED load power supply circuit |
-
2015
- 2015-04-28 CN CN201510206199.8A patent/CN106163046B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101720147A (en) * | 2009-07-21 | 2010-06-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN202009225U (en) * | 2011-03-09 | 2011-10-12 | 深圳创维数字技术股份有限公司 | Boosting DC-DC short-circuit protection circuit |
| CN202145692U (en) * | 2011-07-28 | 2012-02-15 | 林万炯 | LED flicker filter circuit |
| CN103683215A (en) * | 2012-09-20 | 2014-03-26 | 林万炯 | Short-circuit protection circuit of electronic switch |
| CN204652731U (en) * | 2015-04-28 | 2015-09-16 | 赛尔富电子有限公司 | A kind of LED power with short-circuit protection |
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| Publication number | Publication date |
|---|---|
| CN106163046A (en) | 2016-11-23 |
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