CN106937436B - A kind of LED power with protection circuit - Google Patents
A kind of LED power with protection circuit Download PDFInfo
- Publication number
- CN106937436B CN106937436B CN201511029738.1A CN201511029738A CN106937436B CN 106937436 B CN106937436 B CN 106937436B CN 201511029738 A CN201511029738 A CN 201511029738A CN 106937436 B CN106937436 B CN 106937436B
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- Prior art keywords
- protection circuit
- led power
- unit
- capacitor
- power supply
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Classifications
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- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of LED power having protection circuit, the LED power include a DC/DC Switching Power Supply, include a capacitor in the DC/DC Switching Power Supply.The LED power further includes a protection circuit.The protection power supply includes the detection unit of a charged state for detecting the capacitor, a control unit, a switch unit and a current limiting unit.The current limiting unit is for limiting the size of current for flowing through the capacitor.Transmission control signal is to described control unit after the detection unit detects that the capacitor is filled, and described control unit, which receives, to be controlled the switching means conductive after the control signal LED power with protection circuit is made to enter normal operating conditions.Since the LED power with protection circuit has the current limiting unit, and the current limiting unit is under the cooperation of the detection unit and control unit, in the early period that LED power is opened, dash current can be limited to the value of very little hereinafter, so as to meet harsher use environment.
Description
Technical field
The present invention relates to a kind of lighting system devices, especially a kind of LED power with protection circuit.
Background technique
In general daily life, all visible various lighting apparatus everywhere, for example, fluorescent lamp, street lamp, desk lamp, skill
Art lamp etc..In above-mentioned lighting apparatus, traditionally most of is with osram lamp as illuminating source.In recent years, due to section
Skill is maked rapid progress, using light emitting diode (LED) as light sources.Notably, in addition to lighting apparatus, for general traffic number
Will, billboard, car light etc. are also changed to use light emitting diode as illuminating source.As previously mentioned, being made using light emitting diode
For illuminating source, it is advantageous in that power saving, and brightness is bigger, therefore in the upper gradually generalization of use.
With popularizing for LED lamp, more and more occasions begin to use LED lamp, such as market, hotel, house.Especially
It is in quotient such as market, hotels according to field, the stability of LED lamp and safety are an especially important indexs.But
In LED switch power supply, biggish dash current is usually had when opening lamps and lanterns, sometimes even the air of front end can be made to hold
Trigger protection is closed, power grid is caused to trip.Therefore, the method for generalling use series thermal-sensitive resistance limits the dash current, but the punching
It is uncontrollable for hitting electric current.User is difficult to select suitable thermistor under a uncontrollable dash current to prevent power grid
Tripping.
Summary of the invention
In view of this, can more accurately be controlled the present invention provides a kind of controllable intelligence impact current protecting circuit
Input the LED power with protection circuit of dash current.
A kind of LED power having protection circuit, the LED power include a DC/DC Switching Power Supply, and the DC/DC is opened
It include a capacitor in powered-down source.The LED power further includes one and the concatenated protection circuit of DC/DC Switching Power Supply.
The protection circuit includes the detection unit of a charged state for detecting the capacitor, and one receives the detection unit
Detection signal and send control signal control unit, one by it is described control signal control on-off switch unit, and
One current limiting unit in parallel with the switch unit.The current limiting unit is for limiting the size of current for flowing through the capacitor.
To described control unit, described control unit connects transmission control signal after the detection unit detects that the capacitor is filled
It receives and controls the switching means conductive after the control signal LED power with protection circuit is made to enter normal work shape
State.
Compared with prior art, since the LED power with protection circuit has the current limiting unit, and the limit
Unit is flowed under the cooperation of the detection unit and control unit, in the early period that LED power is opened, dash current can be limited
The value of very little is hereinafter, as 2.5 amperes hereinafter, so as to meet harsher use environment.
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 functional block diagram of the LED power with protection circuit provided by the invention.
Fig. 2 is the circuit diagram of the LED power with protection circuit of Fig. 1.
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.
Fig. 1 and Fig. 2 is please referred to, is a kind of principle frame of the LED power 100 with protection circuit provided by the invention
Figure.The LED power 100 with protection circuit includes that a DC/DC Switching Power Supply 10 and one open with the DC/DC
Powered-down source-series protection circuit 20.It is well known that the LED power 100 further includes other functional modules, such as AC/
DC rectifier, and it is connected to the load etc. of the output end of the DC/DC Switching Power Supply 10.In the present invention, these function moulds
Block is not as innovation and creation emphasis, and details are not described herein.
The DC/DC Switching Power Supply 10 is a kind of switching power source chip, using the characteristic of the energy storage of capacitor, inductance, is led to
The movement that controllable switch (MOSFET etc.) carries out HF switch is crossed, it is inner that the electric energy of input is stored in capacitor (sense), when switch breaks
When opening, electric energy is released to load again, provides energy.The ability and duty ratio of its power exported or voltage are (when by switch conduction
Between ratio with the period entirely switched) it is related.Therefore, can all come comprising a capacitor in any one DC/DC Switching Power Supply
Charge and discharge come achieve the purpose that direct current convert.And DC/DC Switching Power Supply 10 is used as an integrated circuit device, does not show in Fig. 2
The capacitor out, but for those skilled in the art, DC/DC Switching Power Supply 10 is well-known with capacitor, herein
No longer it is described in detail.Start for the previous period in the LED power 100, the electric current for flowing through the DC/DC Switching Power Supply 10 increases to from 0
When load current value, the capacitor will be in the charging stage, and require harsh Shang Zhaoyong lamp environment for some, load at this
Dash current on capacitor either surge current cannot be too big, can be 50A or 10A, even 2.5A etc., or
Person is smaller value.And dash current smaller for required value, then it cannot be limited only by one thermistor of load
Stream, because of the overlong time that the resistance value of the thermistor increases, 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 and accurately control
The size of the dash current value.
The protection circuit 20 includes the inspection of the charged state of a capacitor for detecting the DC/DC Switching Power Supply 10
Unit 21 is surveyed, one receives the detection signal of the detection unit 21 and sends the control unit 22 of control signal, and one by institute
State the switch unit 23 and a current limiting unit 24 in parallel with the switch unit 23 of control signal control on-off.Working as
The detection unit 21, which detects, transmits control signal to the control after the capacitor of the DC/DC Switching Power Supply 10 is filled
Unit 22, described control unit 22 controls the conducting of switch unit 23 after receiving the control signal, to have described in making
The LED power 100 of protection circuit enters normal operating conditions.
The detection unit 21 include two two output ends for being connected on the DC/DC Switching Power Supply 10 resistance R4,
R5.After the LED power 100 with protection circuit starts, the output end of the DC/DC Switching Power Supply 10 has output electricity
Pressure output.It is the DC/DC Switching Power Supply 10 after the output voltage stabilization of the output end of the DC/DC Switching Power Supply 10
Capacitor be filled, the voltage between resistance R4, R5 is also stabilized in a certain rated value at this time.The detection unit 21 further includes
One capacitor C1, capacitor C1 and one of resistor coupled in parallel.In the present embodiment, the capacitor C1 is in parallel with resistance R5.Institute
Stating control unit 22 can know voltage stabilization between described resistance R4, R5 at what by reading the voltage on the capacitor C1
Value.When the voltage stabilization between described resistance R4, R5 is in a certain value, just the capacitor of expression DC/DC Switching Power Supply 10 is filled with, institute
Normal operating conditions can be entered by stating the LED power 100 with protection circuit, and control unit 22 is according to the electricity of capacitor C1 at this time
Pressure, in other words, the voltage transmission of the detection unit 21 comprising capacitor C1 to control unit 22, the control unit 22 are just controlled and are opened
The on-off of unit 23 is closed to make the LED power 100 with protection circuit enter normal operating conditions.
Described control unit 22 can have the device of processing data function for a single-chip microcontroller or CPU etc..At this
In embodiment, described control unit 22 is a single-chip microcontroller.Described control unit 22 is according to signal, that is, capacitor C of detection unit 21
On voltage size either voltage between two resistance R4, R5 size, the switch unit 23 is connected.
The switch unit 23 is a thyristor, is the abbreviation of thyratron transistor, also referred to as silicon controlled rectifier (SCR).Because
In conducting, as long as there is certain positive anode voltage, no matter gate voltage, thyristor is held on thyristor,
I.e. after turn on thyristors, gate pole is ineffective.Gate pole only plays trigger action.Therefore, when described control unit 22 transmits a root
After specified positive anode voltage according to the parameter setting of the thyristor, which is just connected, no matter and gate voltage.
Therefore, in the case where turn on thyristors, the voltage loaded thereon can be with very little, so as to avoid having protection electricity described
In normal work, influence of the protection circuit 20 to entire power supply, such as partial pressure are too many for the LED power 100 on road.
The current limiting unit 24 includes metal-oxide-semiconductor a Q1, triode a Q2, a resistance R3 and a voltage-stabiliser tube
D1.The metal-oxide-semiconductor Q1 is a kind of P-channel metal-oxide-semiconductor, and the collector of the grid of the metal-oxide-semiconductor and triode Q2 are electrically connected, drain electrode with
One output end of DC/DC Switching Power Supply 10 is electrically connected, source electrode ground connection.Specifically, the source electrode is connect by the resistance R3
Ground.The base stage of the triode Q2 is connected and is grounded with resistance R3, emitter ground connection.It is well known that the triode Q2
With a gate voltage, generally 0.7 volt.The current limiting unit 24 further comprises a starting resistance R1.The starting
Resistance R1 be electrically connected at the input terminal of the DC/DC Switching Power Supply 10 and the collector of triode Q2 and metal-oxide-semiconductor grid it
Between, for when the LED power 100 with protection circuit starts, under the partial pressure of starting resistance R1, the metal-oxide-semiconductor
It is partially ON, start to the capacitor charging of the DC/DC Switching Power Supply 10.It is filled in the capacitor to the DC/DC Switching Power Supply 10
In the process of electricity, load electric current on resistance R3 is gradually increased, and the voltage on resistance R3 is also gradually increased, until increasing to
The gate voltage of the triode Q2, i.e., 0.7 volt.Triode Q2 just will load the voltage clamping on the resistance R3 at this time
At 0.7 volt, that is, it will be certain for flowing through the electric current on resistance R3 also, and the size of the electric current is related with the resistance value of resistance R3
System.And the size of the electric current is also the charging current for flowing through the capacitor of the DC/DC Switching Power Supply 10.Therefore, Ke Yitong
Cross that select the resistance value of different resistance R3 big to set the charging current of the different capacitors for flowing through the DC/DC Switching Power Supply 10
It is small, achieve the purpose that intelligent control.Simultaneously as the gate voltage of triode Q2 is certain, therefore it can accurately set institute
The resistance value for stating resistance R3, which accurately to control the LED power 100 with protection circuit, to be loaded in DC/DC Switching Power Supply 10
Maximum impact electric current.After the capacitor of DC/DC Switching Power Supply 10 is full of, flowing through electric current on the metal-oxide-semiconductor Q1, resistance R3 will be by
Gradual change is small, is finally reduced to the electric current of a very little, at this point, voltage of the triode Q2 no longer to the load on resistance R3
Clamper is carried out, because flowing through the electric current very little on resistance R3.The voltage-stabiliser tube D1 is electrically connected at the collection of the triode Q2
The both ends of electrode and emitter, after voltage of the triode Q2 no longer to the load on resistance R3 carries out clamper, the voltage-stabiliser tube
Voltage stabilization can be such that the metal-oxide-semiconductor Q1 can be in completely open value by D1 at one.In the present embodiment, the voltage-stabiliser tube
D1 by voltage stabilization at 12 volts, at this point, the metal-oxide-semiconductor Q1 be in complete open state.
Because the capacitor in the DC/DC Switching Power Supply 10 fills with, the LED power with protection circuit described at this time
100 should enter normal operating conditions.And then the detection unit 21 detects that the voltage stabilization between resistance R4, R5 exists at this time
A certain value just sends signal to described control unit 22, and specific is the voltage value between resistance R4, R5.Described control unit
22 the switch unit 23 is connected according to the size of the voltage value is thyristor, due to thyristor impedance relative to resistance R3 very
It is small, therefore after the switch unit 23 conducting, the current limiting unit 24 will be bypassed, i.e. electric current will not flow through the current limiting unit
24 and formed loss.
The current limiting unit 24 further comprises a thermistor FV1.The thermistor FV1 and metal-oxide-semiconductor Q1
Series connection, so as to the initial stage being activated in the LED power 100 with protection circuit, shares the metal-oxide-semiconductor Q1 and is loaded
Power consumption, so as to protect the metal-oxide-semiconductor Q1 not to be damaged.
Compared with prior art, the LED power 100 due to described with protection circuit has the current limiting unit 24,
The current limiting unit 24, can be in the early period that LED power 100 is opened under the cooperation of the detection unit 21 and control unit 22
By the value of dash current limitation very little hereinafter, as 2.5 amperes hereinafter, so as to meet harsher use environment.Simultaneously
According to the circuit design of the current limiting unit 24, the resistance value that can accurately control the resistance R3 flows through the DC/ to control
The electric current of the capacitor of DC Switching Power Supply 10 reaches intelligentized purpose.
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 (10)
1. a kind of LED power with protection circuit, the LED power includes a DC/DC Switching Power Supply, and the DC/DC is opened
It include a capacitor in powered-down source, it is characterised in that: the LED power further includes one and connects with the DC/DC Switching Power Supply
Protection circuit, the protection circuit include one for detect the capacitor charged state detection unit, one reception
The detection signal of the detection unit and the control unit for sending control signal, opening by the control signal control on-off
Unit and a current limiting unit in parallel with the switch unit are closed, the current limiting unit flows through the capacitor for limiting
Size of current, after the detection unit detects that the capacitor is filled transmission control signal to described control unit, institute
It states control unit and receives and control the switching means conductive after the control signal and enter the LED power with protection circuit
Normal operating conditions.
2. as described in claim 1 with the LED power of protection circuit, it is characterised in that: described control unit is a list
Piece machine.
3. as described in claim 1 with the LED power of protection circuit, it is characterised in that: the switch unit is a crystalline substance
Brake tube.
4. as described in claim 1 with the LED power of protection circuit, it is characterised in that: the detection unit includes two
It is connected on the resistance of two output ends of the DC/DC Switching Power Supply, which is electrically connected at one by series system
It rises.
5. as claimed in claim 4 with the LED power of protection circuit, it is characterised in that: the detection unit further includes one
A capacitor, the capacitor are in parallel with one in described two resistance.
6. as described in claim 1 with the LED power of protection circuit, it is characterised in that: the current limiting unit includes one
Metal-oxide-semiconductor, a triode, a resistance and a voltage-stabiliser tube.
7. as claimed in claim 6 with the LED power of protection circuit, it is characterised in that: the metal-oxide-semiconductor is a kind of P-channel
Metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor and the collector of triode are electrically connected, an output end electricity of drain electrode and DC/DC Switching Power Supply
Property connection, source electrode ground connection.
8. as claimed in claim 7 with the LED power of protection circuit, it is characterised in that: the current limiting unit further includes one
A thermistor, the thermistor are arranged between the drain electrode and an output end of DC/DC Switching Power Supply.
9. as claimed in claim 6 with the LED power of protection circuit, it is characterised in that: the current limiting unit further includes one
A starting resistance, the starting resistance are electrically connected at the high level input terminal of the DC/DC Switching Power Supply and the current collection of triode
Between pole.
10. as claimed in claim 6 with the LED power of protection circuit, it is characterised in that: the voltage-stabiliser tube is electrically connected at
Between the collector and emitter of triode, the resistance is electrically connected between the base stage and ground of the triode.
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 CN106937436A (en) | 2017-07-07 |
| CN106937436B true 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) |
Families Citing this family (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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| 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 |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
| 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 |
| 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 |
-
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 |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
| 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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| Publication number | Publication date |
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| CN106937436A (en) | 2017-07-07 |
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