CN106937436A - A kind of LED power with protection circuit - Google Patents
A kind of LED power with protection circuit Download PDFInfo
- Publication number
- CN106937436A CN106937436A CN201511029738.1A CN201511029738A CN106937436A CN 106937436 A CN106937436 A CN 106937436A CN 201511029738 A CN201511029738 A CN 201511029738A CN 106937436 A CN106937436 A CN 106937436A
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- China
- Prior art keywords
- protection circuit
- led power
- electric capacity
- resistance
- restriction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A kind of LED power for having a protection circuit, the LED power includes a DC/DC Switching Power Supply, and the DC/DC Switching Power Supplies include an electric capacity.The LED power also includes a protection circuit.The protection power supply includes the detection unit of a charged state for detecting the electric capacity, a control unit, a switch element, and a flow-restriction.The flow-restriction is used to limit the size of current for flowing through the electric capacity.Transmitted after the electric capacity is filled control signal to described control unit when the detection unit is detected, described control unit is received and controls after the control signal switching means conductive LED power with protection circuit is entered normal operating conditions.Because the LED power with protection circuit has described flow-restriction, and the flow-restriction is under the cooperation of the detection unit and control unit, in the early stage that LED power is opened, dash current can be limited below the value of very little, such that it is able to meet harsher use environment.
Description
Technical field
The present invention relates to a kind of lighting system devices, particularly a kind of LED power with protection circuit.
Background technology
In general daily life, all visible various lighting apparatus everywhere, for example, fluorescent lamp, street lamp,
Desk lamp, artistic lamp etc..In above-mentioned lighting apparatus, traditionally major part is as luminous with osram lamp
Light source.In recent years, because science and technology is maked rapid progress, by the use of light emitting diode (LED) as light sources.Very
Person, in addition to lighting apparatus, for general traffic sign, billboard, car light etc., is also changed to using luminous
Diode is as illuminating source.As it was previously stated, using light emitting diode as illuminating source, it is advantageous in that
Power saving, and brightness is bigger, therefore in the upper gradually generalization of use.
With the popularization of LED lamp, increasing occasion begins to use LED lamp, such as market, hotel,
At home.Field particularly is shone in business such as market, hotels, stability and the security of its LED lamp are one
Especially important index.But, in LED switch power supply, generally had when opening light fixture larger
Dash current, sometimes even can make the air switch trigger protection of front end, cause power network to trip.Therefore,
The dash current is generally limited using the method for series thermal-sensitive resistance, but the dash current is uncontrollable.With
Family is difficult to select suitable thermistor to prevent power network from tripping under a uncontrollable dash current.
The content of the invention
In view of this, the invention provides the controllable intelligence impact current protecting circuit of one kind, can be more accurate
Control input dash current the LED power with protection circuit.
A kind of LED power for having a protection circuit, the LED power includes a DC/DC Switching Power Supply,
The DC/DC Switching Power Supplies include an electric capacity.The LED power also includes one with the DC/DC
The protection circuit of Switching Power Supply series connection.The protection power supply includes a charging shape for being used to detect the electric capacity
The detection unit of state, a control unit for receiving the detection signal of the detection unit and sending control signal,
One switch element that break-make is controlled by the control signal, and a limit in parallel with the switch element
Stream unit.The flow-restriction is used to limit the size of current for flowing through the electric capacity.When detection unit inspection
Measure and transmitted after the electric capacity is filled control signal to described control unit, described control unit receives the control
The switching means conductive is controlled after signal processed makes the LED power with protection circuit enter normal work
State.
Compared with prior art, because the LED power with protection circuit has described flow-restriction,
And the flow-restriction is under the cooperation of the detection unit and control unit, in the early stage that LED power is opened,
Dash current can be limited below the value of very little, it is such as less than 2.5 amperes, harsher such that it is able to meet
Use environment.
Brief description of the drawings
Below in conjunction with Description of Drawings embodiments of the invention, wherein：
A kind of theory diagram of LED power with protection circuit that Fig. 1 is provided for the present invention.
Fig. 2 is the circuit diagram of the LED power with protection circuit of Fig. 1.
Specific embodiment
Specific embodiment of the invention is further elaborated below based on accompanying drawing.It should be appreciated that
The protection domain that the explanation to the embodiment of the present invention is not intended to limit the present invention herein.
Fig. 1 and Fig. 2 is referred to, a kind of its LED power 100 with protection circuit provided for the present invention
Theory diagram.The LED power 100 with protection circuit includes a DC/DC Switching Power Supply 10,
And a protection circuit 20 connected with the DC/DC Switching Power Supplies.It is well known that the LED
Power supply 100 also includes other functional modules, such as AC/DC rectifiers, and is connected to the DC/DC
Load of the output end of Switching Power Supply 10 etc..In the present invention, these functional modules are not as innovation and creation weight
Point, will not be repeated here.
The DC/DC Switching Power Supplies 10 are a kind of switching power source chip, and it utilizes the energy storage of electric capacity, inductance
Characteristic, the action of HF switch is carried out by gate-controlled switch (MOSFET etc.), will be input into electric energy storage
There is electric capacity (sense) inner, when the switches are opened, electric energy is released to load again, there is provided energy.Its output
The ability of power or voltage and dutycycle (by the ratio in switch conduction times and the cycle of whole switch) are relevant.
Therefore, an electric capacity can be all included in any one DC/DC Switching Power Supply carry out discharge and recharge to reach direct current conversion
Purpose.It is not shown described in fig. 2 and DC/DC Switching Power Supplies 10 are used as an IC-components
Electric capacity, but for those skilled in the art, DC/DC Switching Power Supplies 10 be with electric capacity it is well known that
Will not be described in detail herein.Start for the previous period in the LED power 100, flow through DC/DC switch electricity
The electric current in source 10 from 0 increase to load current value when, the electric capacity will be in the charging stage, and for some
It is required that harsh business is according to lamp environment is used, the dash current or surge current being carried on the electric capacity can not be too
Greatly, it can be 50A, or 10A, even 2.5A etc., or smaller value.And for wanting
The smaller dash current of evaluation, then cannot carry out current limliting, because the heat only by one thermistor of loading
The overlong time of the resistance increase of quick resistance, it is difficult in a short time drop to the value of dash current required
Dash current value.Meanwhile, the thermistor can not be directed to the requirement of different dash current values and realize essence
Really control the size of the dash current value.
The protection circuit 20 includes the charging of the electric capacity for detecting the DC/DC Switching Power Supplies 10
The detection unit 21 of state, a control for receiving the detection signal of the detection unit 21 and sending control signal
Unit processed 22, one by the control signal control break-make switch element 23, and one with the switch
The flow-restriction 24 of the parallel connection of unit 23.The DC/DC Switching Power Supplies are being detected when the detection unit 21
10 electric capacity transmits control signal to described control unit 22 after being filled, described control unit 22 is received
The switch element 23 is controlled to turn on after to the control signal, so that the LED with protection circuit
Power supply 100 enters normal operating conditions.
The detection unit 21 includes two two output ends for being connected on the DC/DC Switching Power Supplies 10
Resistance R4, R5.After the LED power 100 with protection circuit starts, the DC/DC switches
The output end of power supply 10 has output voltage output.When the DC/DC Switching Power Supplies 10 output end it is defeated
That the electric capacity of the DC/DC Switching Power Supplies 10 is filled after going out voltage stabilization, now resistance R4,
Voltage between R5 is also stabilized in a certain rated value.The detection unit 21 also includes an electric capacity C1, should
Electric capacity C1 and one of resistor coupled in parallel.In the present embodiment, the electric capacity C1 is in parallel with resistance R5.
Described control unit 22 by read the voltage on the electric capacity C1 just may know that described resistance R4, R5 it
Between voltage stabilization what be worth.When the voltage stabilization between described resistance R4, R5 is in a certain value, just represent
The electric capacity of DC/DC Switching Power Supplies 10 is filled with, and the LED power 100 with protection circuit can be entered
Enter normal operating conditions, now control unit 22 is according to the voltage of electric capacity C1, in other words, comprising electricity
The voltage of detection unit 21 for holding C1 is transferred to control unit 22, the control unit 22 just controlling switch unit
23 break-make enters normal operating conditions making the LED power 100 with protection circuit.
Described control unit 22 can be a single-chip microcomputer, or CPU etc. is with processing data function
Device.In the present embodiment, described control unit 22 is a single-chip microcomputer.The basis of described control unit 22
The signal of detection unit 21 is the size or the electricity between two resistance R4, R5 of the voltage on electric capacity C
The size of pressure, turns on the switch element 23.
The switch element 23 is an IGCT, is the abbreviation of thyratron transistor, also referred to as silicon controlled rectifier
Device.Because IGCT is in the case of conducting, as long as there is certain positive anode voltage, no matter gate voltage is such as
What, IGCT is held on, i.e., after turn on thyristors, gate pole is ineffective.Gate pole only plays trigger action.
Therefore, when described control unit 22 transmits the specified positive anode of a parameter setting according to the IGCT
After voltage, the IGCT is just turned on, no matter and gate voltage.Because a little, in the situation of turn on thyristors
Under, the voltage for loading thereon can be with very little, such that it is able to avoid in the LED power with protection circuit
100 in normal work, and the influence of the whole power supply of the protection circuit 20 pairs, such as partial pressure is too many.
The flow-restriction 24 includes metal-oxide-semiconductor a Q1, triode Q2, a resistance R3, with
And a voltage-stabiliser tube D1.The metal-oxide-semiconductor Q1 is a kind of P-channel metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor
Colelctor electrode with triode Q2 is electrically connected with, and drains electrical with an output end of DC/DC Switching Power Supplies 10
Connection, source ground.Specifically, the source electrode is grounded by the resistance R3.The triode Q2's
Base stage is connected and is grounded with resistance R3, grounded emitter.It is well known that the triode Q2 has
One gate voltage, generally 0.7 volt.The flow-restriction 24 further comprises a starting resistance R1.
Starting resistance R1 is electrically connected at the input of the DC/DC Switching Power Supplies 10 and the collection of triode Q2
Between electrode and the grid of metal-oxide-semiconductor, for when the LED power 100 with protection circuit starts,
Under the partial pressure of starting resistance R1, the metal-oxide-semiconductor is partially ON, starts to switch electricity to the DC/DC
The electric capacity in source 10 charges.During the electric capacity to the DC/DC Switching Power Supplies 10 charges, its loading
Electric current gradually increases on resistance R3, and the voltage on resistance R3 also gradually increases, described until increasing to
The gate voltage of triode Q2, i.e., 0.7 volt.Now triode Q2 just will be carried in the resistance R3
On voltage clamping at 0.7 volt, that is, it also will be certain, and electric current to flow through the electric current on resistance R3
Size has relation with the resistance of resistance R3.And the size of the electric current is also to flow through the DC/DC switches electricity
The charging current of the electric capacity in source 10.Therefore, it can be set by selecting the resistance of different resistance R3
The charging current of the fixed different electric capacity for flowing through the DC/DC Switching Power Supplies 10, reaches Based Intelligent Control
Purpose.Simultaneously as the gate voltage of triode Q2 is certain, therefore can accurately set the electricity
The resistance for hindering R3 to have described in precise control the LED power 100 of protection circuit to be carried in DC/DC switches
Maximum impact electric current on power supply 10.After the electric capacity of DC/DC Switching Power Supplies 10 is full of, flow through described
Electric current on metal-oxide-semiconductor Q1, resistance R3 will be tapered into, and finally be reduced to an electric current for very little, now,
The voltage that the triode Q2 is no longer carried on resistance R3 to this carries out clamper, because flowing through resistance R3
On electric current very little.The voltage-stabiliser tube D1 is electrically connected at the colelctor electrode and emitter stage of the triode Q2
Two ends, after the voltage that triode Q2 is no longer carried on resistance R3 to this carries out clamper, voltage-stabiliser tube D1
At one the metal-oxide-semiconductor Q1 can be in full opening of value voltage stabilization.In the present embodiment,
By voltage stabilization at 12 volts, now, the metal-oxide-semiconductor Q1 is in the shape for completing to open to institute palm fibre voltage-stabiliser tube D1
State.
Because the electric capacity in the DC/DC Switching Power Supplies 10 is filled with, now described with protection circuit
LED power 100 should enter normal operating conditions.And then now the detection unit 21 detects electricity
Voltage stabilization of the resistance between R4, R5 is specific to be just to the sending signal of described control unit 22 in a certain value
It is the magnitude of voltage between resistance R4, R5.Described control unit 22 is according to the size of the magnitude of voltage is turned on
Switch element 23 is IGCT, because the impedance of IGCT is relative to resistance R3 very littles, therefore is opened when described
After closing the conducting of unit 23, the flow-restriction 24, i.e. electric current will be bypassed and will not flow through the flow-restriction 24
And form loss.
The flow-restriction 24 further comprises a thermistor FV1.Thermistor FV1 with it is described
Metal-oxide-semiconductor Q1 connects, such that it is able to the initial stage being activated in the LED power 100 with protection circuit,
The power consumption that the metal-oxide-semiconductor Q1 is loaded is shared, such that it is able to protect the metal-oxide-semiconductor Q1 to be not damaged by.
Compared with prior art, because the LED power 100 with protection circuit has described current limliting
Unit 24, the flow-restriction 24 under the cooperation of the detection unit 21 and control unit 22, in LED
The early stage that power supply 100 is opened, can limit below the value of very little dash current, such as less than 2.5 amperes, from
And harsher use environment can be met.While the circuit design of the flow-restriction 24 according to, can
The electricity of the electric capacity for controlling to flow through the DC/DC Switching Power Supplies 10 with the resistance of resistance R3 described in precise control
Stream, reaches intelligentized purpose.
Presently preferred embodiments of the present invention is these are only, is not used to limit to protection scope of the present invention, Ren He
Modification, equivalent or improvement in spirit of the invention etc., all cover in scope of the presently claimed invention.
Claims (10)
1. a kind of LED power with protection circuit, the LED power includes a DC/DC Switching Power Supply, and the DC/DC Switching Power Supplies include an electric capacity, it is characterised in that：The LED power also includes a protection circuit connected with the DC/DC Switching Power Supplies, the protection power supply includes the detection unit of a charged state for detecting the electric capacity, one control unit for receiving the detection signal of the detection unit and sending control signal, one switch element that break-make is controlled by the control signal, and a flow-restriction in parallel with the switch element, the flow-restriction is used to limit the size of current for flowing through the electric capacity, transmitted after the electric capacity is filled control signal to described control unit when the detection unit is detected, described control unit is received and controls after the control signal switching means conductive LED power with protection circuit is entered normal operating conditions.
2. there is the LED power of protection circuit as claimed in claim 1, it is characterised in that：Described control unit is a single-chip microcomputer.
3. there is the LED power of protection circuit as claimed in claim 1, it is characterised in that：The switch element is an IGCT.
4. there is the LED power of protection circuit as claimed in claim 1, it is characterised in that：The detection unit includes two two resistance of output end for being connected on the DC/DC Switching Power Supplies, and two resistance are electrically connected by series system.
5. there is the LED power of protection circuit as claimed in claim 4, it is characterised in that：The detection unit also includes an electric capacity, and the electric capacity is in parallel with described two resistance.
6. there is the LED power of protection circuit as claimed in claim 1, it is characterised in that：The flow-restriction includes a metal-oxide-semiconductor, a triode, a resistance, and a voltage-stabiliser tube.
7. there is the LED power of protection circuit as claimed in claim 6, it is characterised in that：The metal-oxide-semiconductor is a kind of P-channel metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is electrically connected with the colelctor electrode of triode, and drain electrode is electrically connected with an output end of DC/DC Switching Power Supplies, source ground.
8. there is the LED power of protection circuit as claimed in claim 7, it is characterised in that：The flow-restriction also includes a thermistor, and the thermistor is arranged between the drain electrode and an output end of DC/DC Switching Power Supplies.
9. there is the LED power of protection circuit as claimed in claim 6, it is characterised in that：The flow-restriction also includes a starting resistance, and the starting resistance is electrically connected between the high level input of the DC/DC Switching Power Supplies and the colelctor electrode of triode.
10. there is the LED power of protection circuit as claimed in claim 6, it is characterised in that：The voltage-stabiliser tube is electrically connected between the colelctor electrode of triode and emitter stage, and the resistance is electrically connected between the base stage of the triode and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511029738.1A CN106937436B (en) | 2015-12-31 | 2015-12-31 | A kind of LED power with protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511029738.1A CN106937436B (en) | 2015-12-31 | 2015-12-31 | A kind of LED power with protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106937436A true CN106937436A (en) | 2017-07-07 |
| CN106937436B CN106937436B (en) | 2019-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511029738.1A Active CN106937436B (en) | 2015-12-31 | 2015-12-31 | A kind of LED power with protection circuit |
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| CN (1) | CN106937436B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107969053A (en) * | 2017-12-28 | 2018-04-27 | 广州爱易学智能信息科技有限公司 | Classroom blackboard LED light strip drive circuit with current-limiting protection |
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| CN103457472A (en) * | 2012-05-31 | 2013-12-18 | 海洋王照明科技股份有限公司 | Switching power supply and lamp applying same |
| CN103687240A (en) * | 2013-12-17 | 2014-03-26 | 深圳市华星光电技术有限公司 | Overvoltage and overcurrent protective circuit and electronic device |
| CN205336584U (en) * | 2015-12-31 | 2016-06-22 | 赛尔富电子有限公司 | LED power with protection circuit |
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2015
- 2015-12-31 CN CN201511029738.1A patent/CN106937436B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008234588A (en) * | 2007-03-23 | 2008-10-02 | Matsushita Electric Works Ltd | Power control device |
| CN201418190Y (en) * | 2009-04-15 | 2010-03-03 | 舟山浩德光电科技有限公司 | LED lighting control system |
| CN102858049A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp |
| CN103024973A (en) * | 2011-09-23 | 2013-04-03 | 海洋王（东莞）照明科技有限公司 | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof |
| CN103457472A (en) * | 2012-05-31 | 2013-12-18 | 海洋王照明科技股份有限公司 | Switching power supply and lamp applying same |
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| CN205336584U (en) * | 2015-12-31 | 2016-06-22 | 赛尔富电子有限公司 | LED power with protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107969053A (en) * | 2017-12-28 | 2018-04-27 | 广州爱易学智能信息科技有限公司 | Classroom blackboard LED light strip drive circuit with current-limiting protection |
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| Publication number | Publication date |
|---|---|
| CN106937436B (en) | 2019-05-03 |
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