CN207589244U - A kind of LED desk lamp driving circuit - Google Patents
A kind of LED desk lamp driving circuit Download PDFInfo
- Publication number
- CN207589244U CN207589244U CN201721701842.5U CN201721701842U CN207589244U CN 207589244 U CN207589244 U CN 207589244U CN 201721701842 U CN201721701842 U CN 201721701842U CN 207589244 U CN207589244 U CN 207589244U
- Authority
- CN
- China
- Prior art keywords
- led
- crm6230
- chip
- resistance
- driving circuit
- 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.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a kind of LED desk lamp driving circuit,It includes rectification circuit,Chip CRM6230,Transformer T,Resistance R1,R2,R3,R4,R5,R6,LED lamp bead positive terminal LED+ and LED lamp bead negative terminal LED,LED lamp bead positive terminal LED+ is connected with the positive voltage output end of rectification circuit,The positive voltage output end of rectification circuit passes through resistance R1,R2,R3 is connected with the pin VDD of chip CRM6230,The auxiliary winding L1A of transformer T passes through resistance R4,R5 is connected to the negative voltage output terminal of rectification circuit,Resistance R4,Tie point between R5 is connected with the pin FB of chip CRM6230,The pin DRIAN of chip CRM6230 is connected by the main winding L2A of transformer T with LED lamp bead negative terminal LED,Resistance R6 is connected between the pin CS of chip CRM6230 and the negative voltage output terminal of rectification circuit.The output voltage of the non-isolated power supply of the LED desk lamp driving circuit of the utility model average voltage in zero load is close to zero.
Description
Technical field
The utility model is related to field of LED drive more particularly to a kind of LED desk lamp driving circuits.
Background technology
It is two kinds that class can be substantially advised in existing desk lamp type of drive, and a kind of is the type of drive of external power supply, access
In desk lamp lamp body is the DC voltage for being generally less than or equal to 24V.Another kind is that alternating current is directly entered in lamp body, and in lamp
In vivo lamp bead is driven using the mode of non-isolated constant-current dimming.
First way it is more universal there are in present table lamp circuit, advantage is that the voltage on desk lamp is low-voltage direct
Voltage on from power panel to lamp plate is all safe, and the safe spacing requirement with lamp body gap can be neglected, but if to accomplish
The cost that high power is realized is higher.And external power supply needs individually do safety.
The second way is directly entered using alternating current in lamp body, is all and alternating current from the power panel to light source board of lamp
There is conducting circuit, and always can be there are one voltage difference between both ends on lamp plate, this voltage difference is that LED connects back under normal circumstances
The pressure drop on road, but because high voltage can be then presented after disconnection in certain reason, closely to intend alternating current whole when this LED circuit
Voltage after stream, maximum can arrive 220*1.414 i.e. 311V.In this case, it is small more than 250V according to present safety requirement
The both ends spacing for ensureing to have 2.5mm is needed in the pressure drop of 500V.
Be not able to give so big gap in structure, present desk lamp pursue beautiful step be will not stop more to walk more
Far.So lamp cap can only be accomplished thin, the corresponding substrate for placing light source can only be accomplished narrower.Limited aluminum substrate width is put
Putting the gap after lamp bead between positive and negative anodes can not ensure to be more than 2.5mm.Be greater than 2.5mm appearances can be restricted can not do it is thin.
It can guarantee that output voltage can only need 1.2mm less than positive and negative clearance between poles if 150V when non-isolated power supply is in zero load.If
The requirement of the lower then positive and negative clearance between poles of voltage will be lower.
Utility model content
It is of the existing technology so as to solve the purpose of this utility model is to provide a kind of LED desk lamp driving circuit
Non-isolated power supply output voltage in zero load is big and the problem of cause the positive and negative clearance between poles of LED lamp bead big.
In the utility model embodiment, a kind of LED desk lamp driving circuit is provided, including rectification circuit, chip
CRM6230, transformer T, resistance R1, R2, R3, R4, R5, R6, LED lamp bead positive terminal LED+ and LED lamp bead negative terminal
LED-, LED lamp bead positive terminal LED+ are connected with the positive voltage output end of rectification circuit, the positive voltage output end of rectification circuit
It is connected by resistance R1, R2, R3 with the pin VDD of chip CRM6230, the auxiliary winding L1A of transformer T passes through resistance R4, R5
The negative voltage output terminal of rectification circuit is connected to, the tie point between resistance R4, R5 is connected with the pin FB of chip CRM6230
It connects, the pin DRIAN of chip CRM6230 is connected by the main winding L2A of transformer T with LED lamp bead negative terminal LED-, electricity
Resistance R6 is connected between the pin CS of chip CRM6230 and the negative voltage output terminal of rectification circuit.
In the utility model embodiment, the pin GND of chip CRM6230 connects the negative voltage output terminal of rectification circuit.
In the utility model embodiment, the LED desk lamp driving circuit, which further includes, is connected to rectification circuit
Capacitance C1 between positive voltage output end and negative voltage output terminal.
In the utility model embodiment, the LED desk lamp driving circuit, which further includes, is connected to rectification circuit
Capacitance C1 between positive voltage output end and negative voltage output terminal.
In the utility model embodiment, the LED desk lamp driving circuit further includes the pin for being connected to chip CRM6230
Capacitance C2 between VDD and the negative voltage output terminal of rectification circuit.
In the utility model embodiment, the LED desk lamp driving circuit further includes the pin for being connected to chip CRM6230
Capacitance C3 between FB and the negative voltage output terminal of rectification circuit.
In the utility model embodiment, the LED desk lamp driving circuit further includes diode D1, the master of transformer T around
Group L2A is connected to the tie point between resistance R2 and resistance R3 by diode D1.
In the utility model embodiment, the LED desk lamp driving circuit further includes diode D2, chip CRM6230's
Pin DRIAN is connected to LED lamp bead positive terminal LED+ by diode D2.
In the utility model embodiment, the LED desk lamp driving circuit further include the resistance R7 in parallel with resistance R6,
R8。
In the utility model embodiment, the LED desk lamp driving circuit, which further includes, is connected to LED lamp bead positive terminal
Capacitance C4 between LED+ and LED lamp bead negative terminal LED-.
In the utility model embodiment, the LED desk lamp driving circuit, which further includes, is connected to LED lamp bead positive terminal
Resistance R9 between LED+ and LED lamp bead negative terminal LED-.
Compared with prior art, using above-mentioned LED desk lamp driving circuit, you can to realize the output of LED driving voltages
For low-voltage in the state of zero load, spacing between two pads of output terminal can be in control within 1.2mm, both can be compared with
Realization for convenience uses non-isolated circuit, and can meet safety, and appearance is unrestricted.
Description of the drawings
Fig. 1 is the circuit diagram of the LED desk lamp driving circuit of the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, not, for limiting the utility model.
The realization of the utility model is described in detail below in conjunction with specific embodiment,
As shown in Figure 1, in the utility model embodiment, a kind of LED desk lamp driving circuit is provided, including rectified current
Road, chip CRM6230, transformer T, resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, capacitance C1, C2, C3, C4, diode
D1, D2, LED lamp bead positive terminal LED+ and LED lamp bead negative terminal LED-.
Rectification circuit is connected with AC power, for carrying out rectification, output voltage to electric main.Capacitance C1 is connected to
Between the positive voltage output end of rectification circuit and negative voltage output terminal.The positive electricity of LED lamp bead positive terminal LED+ and rectification circuit
Pressure output terminal is connected.The positive voltage output end of rectification circuit also passes through resistance R1, R2, R3 and the pin VDD of chip CRM6230
It is connected, for providing working power for chip CRM6230.The pin VDD of chip CRM6230 also connects rectified current by capacitance C2
The negative voltage output terminal on road, capacitance C2 play filter action.
The auxiliary winding L1A of transformer T is connected to the negative voltage output terminal of rectification circuit, resistance R4, R5 by resistance R4, R5
Between tie point be connected with the pin FB of chip CRM6230.The pin FB of chip CRM6230 is connected also through capacitance C3
Connect the negative voltage output terminal of rectification circuit.Capacitance C3 plays filter action.The main winding of transformer T is also connected by diode D1
Tie point to resistance R2 and resistance R3.
The pin DRIAN of chip CRM6230 is connected by the main winding L2A of transformer T with LED lamp bead negative terminal LED-
It connects, pin DRIAN is also connected to LED lamp bead positive terminal LED+ by diode D2.Resistance R6, R7, R8 are parallel to chip
Between the pin CS of CRM6230 and the negative voltage output terminal of rectification circuit.The pin GND of chip CRM6230 connects rectification circuit
Negative voltage output terminal.
The operation principle of foregoing circuit is as follows：
1st, under circuit normal condition and load has situation during access as follows.
High-pressure pulse direct current of the electric main after rectified circuit rectifies divides two-way, all the way after capacitance C1 filtering
It connects with resistance R3 to obtain a voltage after the current limliting of resistance R1, R2, this voltage is supplied to drawing for chip CRM6230
Foot VDD uses for the internal electric source power supply of chip CRM6230.
After chip CRM6230 obtains power supply, an oscillating voltage can be exported to drive pin DRIAN, it is whole in this way
High pressure after stream arrives LED lamp bead negative terminal LED- again through LED lamp bead positive terminal LED+, the main winding L2A streams through transformer T
Enter the pin DRIAN to chip CRM6230, then flowed back to by resistance R6, R7, R8 that the pin CS of chip CRM6230 is connected
A signal voltage is generated to the negative voltage output terminal of rectification circuit, and in the pin CS of chip CRM6230, re-forms circuit,
The auxiliary winding L1A of L2A flows the voltage of generation because there are electromagnetic induction with main winding L2A after the partial pressure of resistance R4, R5 simultaneously
Enter the pin FB to chip CRM6230, for having monitored whether load access.When the pin FB of chip CRM6230 have voltage and
When the pin CS of chip CRM6230 has signal voltage, chip CRM6230 normal works.LED lamp bead positive terminal LED+ and LED
Lamp bead negative terminal LED- obtains appropriate driving voltage.
2nd, the situation when the load between LED+ and LED2- is disconnected is as follows.
High-voltage electricity after rectification is only powered after capacitance C1 filtering through resistance R1, R2, R3 for VDD all the way, another circuit
Invalid, no electric current flows through on the main winding L2A of transformer, and the auxiliary winding L1A of transformer is also sensed less than voltage, chip
The pin FB no-voltages of CRM6230 are unsatisfactory for the drive condition of the pin DRIAN of chip CRM6230, and chip CRM6230's draws
On the disconnection of the circuit of foot DRIAN and pin GND, such LED lamp bead positive terminal LED+ and LED lamp bead negative terminal LED- just
There is no voltage.
In conclusion using above-mentioned LED desk lamp driving circuit, you can to realize the output of LED driving voltages in zero load
It is low-voltage under state, the spacing between two pads of output terminal can be in control within 1.2mm, both can be conveniently
It realizes and uses non-isolated circuit, and safety can be met, and appearance is unrestricted.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of LED desk lamp driving circuit, which is characterized in that including rectification circuit, chip CRM6230, transformer T, resistance R1,
R2, R3, R4, R5, R6, LED lamp bead positive terminal LED+ and LED lamp bead negative terminal LED-, LED lamp bead positive terminal LED+ with
The positive voltage output end of rectification circuit is connected, and the positive voltage output end of rectification circuit passes through resistance R1, R2, R3 and chip
The pin VDD of CRM6230 is connected, and the auxiliary winding L1A of transformer T is connected to the negative voltage of rectification circuit by resistance R4, R5
Output terminal, the tie point between resistance R4, R5 are connected with the pin FB of chip CRM6230, the pin of chip CRM6230
DRIAN is connected by the main winding L2A of transformer T with LED lamp bead negative terminal LED-, and resistance R6 is connected to chip
Between the pin CS of CRM6230 and the negative voltage output terminal of rectification circuit.
2. LED desk lamp driving circuit as described in claim 1, which is characterized in that the pin GND of chip CRM6230 connects rectification
The negative voltage output terminal of circuit.
3. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include and be connected to rectification circuit
Positive voltage output end and negative voltage output terminal between capacitance C1.
4. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include and be connected to drawing for chip CRM6230
Capacitance C2 between foot VDD and the negative voltage output terminal of rectification circuit.
5. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include and be connected to drawing for chip CRM6230
Capacitance C3 between foot FB and the negative voltage output terminal of rectification circuit.
6. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include diode D1, the master of transformer T
Winding L2A is connected to the tie point between resistance R2 and resistance R3 by diode D1.
7. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include diode D2, chip CRM6230
Pin DRIAN LED lamp bead positive terminal LED+ is connected to by diode D2.
8. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include the resistance R7 in parallel with resistance R6,
R8。
9. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include and be connected to LED lamp bead positive terminal
Capacitance C4 between LED+ and LED lamp bead negative terminal LED-.
10. LED desk lamp driving circuit as described in claim 1, which is characterized in that further include and be connected to LED lamp bead positive terminal
Resistance R9 between sub- LED+ and LED lamp bead negative terminal LED-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721701842.5U CN207589244U (en) | 2017-12-08 | 2017-12-08 | A kind of LED desk lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721701842.5U CN207589244U (en) | 2017-12-08 | 2017-12-08 | A kind of LED desk lamp driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207589244U true CN207589244U (en) | 2018-07-06 |
Family
ID=62736306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721701842.5U Active CN207589244U (en) | 2017-12-08 | 2017-12-08 | A kind of LED desk lamp driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207589244U (en) |
-
2017
- 2017-12-08 CN CN201721701842.5U patent/CN207589244U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201893960U (en) | Lighting device for inhibiting light fluctuation by means of multiphase driving electric energy | |
| CN201377769Y (en) | High-power high-voltage input explosion-proof intrinsically-safe LED illuminating lamp | |
| CN109618468A (en) | A kind of LED lamp circuit with intelligent control function | |
| WO2021088114A1 (en) | T-shaped tube-based led drive circuit | |
| TWI401991B (en) | Power transformation apparatus between dc lighting element and ballast | |
| CN202857066U (en) | Novel high-power LED isolation constant-current driving circuit composed by discrete components | |
| US20160270169A1 (en) | Led driver and circuit and electronic device | |
| CN207589244U (en) | A kind of LED desk lamp driving circuit | |
| TWM464965U (en) | LED driving circuit with high power factor and high current precision | |
| CN206490855U (en) | A kind of wide pressure power supplies of LED | |
| KR20110084606A (en) | Led lighting circuit with stabilizer for fluorescent lamp of boost-up type | |
| CN112383235B (en) | Power supply device for parallel connection of LED outdoor advertising screens | |
| CN211509366U (en) | LED drive circuit based on T-shaped lamp tube | |
| CN205005320U (en) | Driving circuit of light -emitting diode (LED) fluorescent tube | |
| TW201632029A (en) | LED drive system and LED drive method | |
| CN207118025U (en) | Alternating current circuit module and led light source | |
| CN207005797U (en) | LED straight tube lamp systems | |
| CN211531388U (en) | LED drive circuit | |
| CN211378315U (en) | Non-isolated voltage-reducing shared EMC single-circuit and double-circuit combined LED device | |
| CN209497652U (en) | A kind of LED drive circuit of fail-safe dual power supply | |
| CN107979896A (en) | A kind of three sections of switch color-temperature regulating LED power circuits and control method | |
| CN216217661U (en) | LED power is kept apart to line of adjusting luminance | |
| CN102141204A (en) | LED light emitting device | |
| CN207783196U (en) | Lamps and lanterns and its control device | |
| CN202907259U (en) | 36 V to 220 V general LED illuminating lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |