CN106912140B - A kind of control chip functions pin expands circuit and dimming driver - Google Patents
A kind of control chip functions pin expands circuit and dimming driver Download PDFInfo
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- CN106912140B CN106912140B CN201710026427.2A CN201710026427A CN106912140B CN 106912140 B CN106912140 B CN 106912140B CN 201710026427 A CN201710026427 A CN 201710026427A CN 106912140 B CN106912140 B CN 106912140B
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- module
- negative pressure
- control chip
- transformer
- taking out
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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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of control chip functions pins to expand circuit, and including taking out electric module and negative pressure generation module, with the functional pin of chip is controlled to connect, the other end for taking out electric module is connect with negative pressure generation module for described one end for taking out electric module；The negative pressure generation module includes filter module and transformer, and one end of the filter module is connect with one end of the transformer, and the other end of the other end of the filter module and the transformer is grounded；When input voltage increases, filter module and the transformer interaction of negative pressure generation module generate negative voltage, and are load supplying, and export constant output current after taking out electric module and reducing negative voltage.In addition, the invention also discloses a kind of dimming drivers.Using the present invention, the range of control chip functions pin operating voltage is had adjusted, enhances the load capacity of control chip.
Description
Technical field
The present invention relates to a kind of expansion circuit, particularly a kind of control chip functions pin expands circuit and light modulation drives
Device.
Background technology
As country widelys popularize energy-conserving product, demand of the market to DC power supply and LED driver is increasing.
Under various changes in demand, power supply and LED driver access a variety of different loads or expand bringing onto load range or expand input electricity
It presses under the states such as range.At present, since the operating voltage range of control chip functions pin is relatively low, it can not meet and expand load
It is required that therefore generally use increase control chip or increase complicated circuit and carry range realizing above-mentioned expansion band or expand voltage
The particular/special requirement of range considerably increases the cost of product.Therefore, there is an urgent need to a kind of control chip functions pin operating voltages
Adjustment circuit carrys out the operating voltage range of expanded functionality pin.
Invention content
It is an object of the invention to provide a kind of control chip functions pins to expand circuit and dimming driver, expands control core
The operating voltage range of piece functional pin, reduces product cost.
Of the existing technology to solve the problems, such as, the present invention provides a kind of control chip functions pin and expands circuit, the electricity
Road includes：Electric module and negative pressure generation module are taken out, described one end for taking out electric module is with controlling the functional pin of chip to connect, institute
The other end for stating the electric module of pumping is connect with negative pressure generation module；The negative pressure generation module includes filter module and transformer,
One end of the filter module is connect with one end of the transformer, the other end of the filter module and the transformer it is another
One end is grounded；
When input voltage increases, the rectified module of transformer both end voltage provides negative pressure in negative pressure generation module, through filter
After the removal interference of wave module, and the voltage range of control chip functions pin is reduced by taking out electric module, make constant output current.
The technical program is generated negative pressure and passed through using negative pressure generation module takes out electric module and the controlling switch of control chip
Connection, therefore negative pressure is superimposed upon on the functional pin of control chip, the operating voltage of control chip functions pin is reduced, is adjusted
The range of whole control chip functions pin operating voltage enhances the load capacity of control chip, improves control chip
Performance.In addition, by filter module filtering interference signals, the delivery efficiency of negative pressure generation module is improved.
In addition, the negative pressure generation module further includes rectification module, one end of the rectification module is connect with filter module,
The other end of the rectification module is connect with transformer.
In addition, the rectification module is rectifier diode or transistor or field-effect tube.
In addition, the electricity module of taking out is divider resistance.
In addition, the electricity module of taking out includes multiple divider resistances, the multiple divider resistance is using side in parallel or series
Formula is connected with each other.Therefore, the resistance value that resistance can be adjusted according to actual conditions facilitates practical application.
In addition, the filter module includes charging resistor and filter capacitor, the plus earth of the filter capacitor is described
The cathode of filter capacitor is connect with charging resistor.Current limliting is carried out using charging resistor, protective effect is played to filter capacitor.
In addition, the filter capacitor includes multiple capacitances, the connection mode of the multiple capacitance for it is in parallel and or series connection；
The charging resistor includes multiple resistance, the connection mode of the multiple resistance for it is in parallel and or series connection.Actual application
In, the combination of multiple capacitances may be used, facilitate practical application.
In addition, the transformer includes one or more inductance, the inductance includes one or more windings.It therefore, can be with
The quantity of the winding of inductance is adjusted according to actual conditions, improves the flexibility of circuit.
Accordingly the present invention also provides a kind of dimming driver, including：Driving chip, in addition, the driving chip function
Pin is connected with expansion circuit, and the expansion circuit includes：Electric module and negative pressure generation module are taken out, it is described to take out the one of electric module
It holds with the functional pin of chip is controlled to connect, the other end for taking out electric module is connect with negative pressure generation module；The negative pressure production
Raw module includes filter module and transformer, and one end of the filter module is connect with one end of the transformer, the filter
The other end of the other end of wave module and the transformer is grounded；
When input voltage increases, the rectified module of transformer both end voltage provides negative pressure in negative pressure generation module, through filter
After the removal interference of wave module, and the voltage range of control chip functions pin is reduced by taking out electric module, make constant output current.
In addition, the negative pressure generation module further includes rectification module, one end of the rectification module is connect with filter module,
The other end of the rectification module is connect with transformer；The rectification module is rectifier diode or transistor or field-effect tube；
The electricity module of taking out is divider resistance；Filter module includes charging resistor and filter capacitor, and the anode of the filter capacitor connects
Ground, the cathode of the filter capacitor are connect with charging resistor.
The embodiment of the present invention is superimposed upon using the negative pressure that negative pressure generation module generates on the chip functions pin for needing to control,
The operating voltage of control chip functions pin is reduced, and then has adjusted the range of control chip functions pin operating voltage, is increased
The strong load capacity of control chip improves the performance of control chip.
Description of the drawings
Fig. 1 is a kind of the first embodiment schematic diagram that chip functions pin is controlled to expand circuit of the present invention；
Fig. 2 is a kind of second of embodiment schematic diagram that chip functions pin is controlled to expand circuit of the present invention；
Fig. 3 is a kind of a kind of schematic diagram of embodiment of dimming driver of the present invention.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
With reference to figure 1, which is a kind of a kind of schematic diagram for embodiment that chip functions pin is controlled to expand circuit of the present invention,
The adjustment circuit includes：10 negative pressure generation module 20 of electric module is taken out, takes out one end of electric module 10 and the functional pin of control chip
Connection, the other end for taking out electric module 10 are connect with negative pressure generation module 20；Negative pressure generation module 20 include filter module 21 and
Transformer 22, one end of filter module 21 are connect with one end of the transformer 22, the other end and transformer of filter module 21
22 other end is grounded；When input voltage increases, the transformer 22 of negative pressure generation module 20 generate voltage it is rectified after carry
For negative pressure, after filtered 21 filtering interference signals of module, IC control function pin voltages are reduced by taking out electric module 10, so as to make
IC control rings are stablized, and export constant output current.
The technical program generates negative voltage using negative pressure generation module, and passes through charging module and carry out taking out electricity, that is, is born
It is acted on after partial pressure on the functional pin of control chip, so as to drag down the minimum electricity of control chip functions pin operating voltage
Pressure expands the range of functional pin operating voltage, expands the load capacity of control chip, makes control chip controls ring steady
It is fixed, constant output current.
With reference to figure 2, which is a kind of signal for second of embodiment that chip functions pin is controlled to expand circuit of the present invention
Figure, is different from the first embodiment, and it can be to take out electric resistance RS71 that electric module is taken out in the present embodiment, which can be
The resistance selected according to actual needs, can also include multiple resistance, and serial or parallel connection may be used in multiple resistance
Mode is attached；In addition, filter module includes charging resistor RS72 and filter capacitor C71；Transformer can be inductance coil
L41；Furthermore it is also possible to including two take over DS71 of rectification.
One end of electric resistance RS71 is taken out with the functional pin HOLD of chip is controlled to be attached, takes out the another of electric resistance RS71
End is connect with filter capacitor C71 with the common end of charging resistor RS72, the cathode of filter capacitor C71 and the one of charging resistor RS72
End connection, the other end of charging resistor RS72 connect with the anode of rectification diode DS71, the cathode of rectifier diode DS71 and
One end connection of inductance coil L41B, the other end ground connection of inductance coil L41B, the plus earth of filter capacitor C71.
The technical program is superimposed negative pressure in HOLD pins, adjusts the size of negative pressure supplying resistance resistance value, can adjust negative pressure
Take out the size of electric electric current.When input voltage is 200V by HOLD foot voltages, voltage on HOLD feet is reduced with current system is taken out, it will
Voltage drops to 0.29V by 0.3V pumpings.When input voltage is in 250V, HOLD foot voltages further drop to 0.15V by pumping.It widens
HOLD foot external feedback voltage ranges, output current are constant at 500mA.When input voltage, which further walks, is lifted to 277V,
HOLD feet voltage, which is further taken out, drops to -0.1V, and output current is constant at 500mA.According to control chip Fairchild
The range of nominal tension on HOLD pins on FL7734 specifications, minimum reachable -0.3V.It can be by chip secure operating voltage range
Accomplish, during input voltage 320V, HOLD feet minimum voltage is in -0.2V, and constant output current is in the requirement of 500mA.With not connecting
The adjustment circuit for connecing the technical program is compared, and the negative pressure of HOLD pins extends to -0.2-5.5V from 0.3-5.5.Thus will be electric
Application range 0-230V is pressed, is extended to 0-320V.And solve full voltage input 0-305V, it is middle appearance " generator " state when,
The uncontrolled situation of output current." generator " state mentioned herein, after referring to that power grid is powered off due to cause specific, using hair
Motor power supply or network voltage are risen to the process of rated voltage by low-voltage.
The adjustment circuit in the embodiment of the present invention is applied below, the present invention is carried out in detail for LED dimming drivers
Explanation.Wherein the dimming driver uses 42V 500I 120-277V single stage type thyristor regulating CD-ROM drivers, light modulation driving
Device Fairchild（Fly million）Single-stage brightness adjustment control chip FL7734.
Refering to what is shown in Fig. 3, the figure is a kind of a kind of schematic diagram of embodiment of dimming driver of the present invention, which drives
The control chip functions pin of the dynamic device application embodiment of the present invention expands circuit, the expansion circuit and the expansion circuit of the present invention
Second embodiment is compared, and identical is that the electric resistance of pumping is still RS71, and filter capacitor is still C71, and commutation capacitor is still DS71；It is different
Be charging resistor include RS72A and RS72B, transformer use inductance coil include three windings L41A, L41B and L41C,
Wherein respectively winding L41A, L41B and L41C no-load voltage ratio be certain, with the lifting of input voltage, between winding voltage it is also the same on
Rise due to current parameter, input voltage from 0-305V when, secondary windings L41B superiors's threshold voltage is by 50-280V or so.
The upper voltages of L41B rectified diode DS71, charging resistor RS72A, charging resistor RS72B give C71 capacitor chargings, charging voltage
About 6V to -130V or so.
When input voltage less than 80V after opening, chip FL7734 enters light-modulating mode work, output current 500mA.
Resistance RS37 both end voltages about 5.5V on HOLD pins, the minimum dimension of output current when minimum angles are adjusted in resistance RS37 resistance values
Hold electric current.Capacitance CS35 filters out high-frequency interferencing signal.Filter capacitor C71 both ends about -10V voltages are reduced through taking out electric resistance RS71
Capacitance CS35 both end voltages, since charging resistor RS71 resistance values are very big, -10V voltage drops substantially to CS35 capacitances both end voltage without
Any influence.Input voltage is further up when reaching 200V, and capacitance C71 both end voltages further decline up to -90V or so, passes through
Resistance RS71 takes out electric current, and capacitance CS35 both end voltages drop to 0.29V.When voltage is in 250V, capacitance CS35 both end voltages are into one
Step is taken out electric resistance RS71 pumpings and drops to 0.15V.HOLD foot external feedback voltage ranges are widened, output current is constant at
500mA.When input voltage, which further walks, is lifted to 277V, capacitance C71 both end voltages further decline up to -120V or so, capacitance
CS35 both end voltages are further taken out electric resistance RS71 pumpings and drop to -0.1V, and output current is constant at 500mA.Input voltage
During 320V, capacitance CS35 both end voltages are in -0.2V, and constant output current is in the requirement of 500mA.
Control chip functions pin operating voltage adjustment circuit in through the embodiment of the present invention is applied in control chip
On the HOLD pins of FL7734, by the functional pin voltage range from 0.3-5.5V, it is extended to -0.2-5.5V.Thus by voltage
Application range 0-230V, is extended to 0-320V.And solves the uncontrolled situation of output current.
Need what is illustrated, though AC AC powers have more been used herein, rectifying tube, power vd D, take out drop, " generator "
Terms are waited, but it does not preclude the possibility of using other terms.The use of these items is only for more easily describe to conciliate
Release the essence of the present invention.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of control chip functions pin expands circuit, which is characterized in that including taking out electric module and negative pressure generation module, institute
The one end for taking out electric module is stated with the functional pin of chip is controlled to connect, the other end for taking out electric module connects with negative pressure generation module
It connects；The negative pressure generation module includes filter module and transformer, one end of the filter module and the one of the transformer
The other end of end connection, the other end of the filter module and the transformer is grounded；
When input voltage increases, the rectified module of transformer both end voltage provides negative pressure, filtered mould in negative pressure generation module
After block removal interference, and the voltage range of control chip functions pin is reduced by taking out electric module, make constant output current;
The negative pressure generation module further includes rectification module, and one end of the rectification module is connect with filter module, the rectification
The other end of module is connect with transformer；
The filter module includes charging resistor and filter capacitor, the plus earth of the filter capacitor, the filter capacitor
Cathode connect with charging resistor.
2. control chip functions pin according to claim 1 expands circuit, which is characterized in that the rectification module is whole
Flow diode or transistor or field-effect tube.
3. control chip functions pin according to claim 1 expands circuit, which is characterized in that the electricity module of taking out is point
Piezoresistance.
4. control chip functions pin according to claim 1 expands circuit, which is characterized in that the electricity module of taking out includes
Multiple divider resistances, the multiple divider resistance are connected with each other by the way of in parallel or series.
5. control chip functions pin according to claim 1 expands circuit, which is characterized in that the filter capacitor includes
Multiple capacitances, the connection mode of the multiple capacitance for it is in parallel and or series connection；The charging resistor includes multiple resistance, described
The connection mode of multiple resistance for it is in parallel and or series connection.
6. control chip functions pin according to any one of claims 1-5 expands circuit, which is characterized in that the change
Depressor includes one or more inductance, and the inductance includes one or more windings.
7. a kind of dimming driver, including driving chip, which is characterized in that the driving chip functional pin is connected with expansion electricity
Road, the expansion circuit include：Take out electric module and negative pressure generation module, described one end for taking out electric module and the work(of control chip
Energy pin connection, the other end for taking out electric module are connect with negative pressure generation module；The negative pressure generation module includes filtering mould
Block and transformer, one end of the filter module are connect with one end of the transformer, the other end of the filter module and
The other end of the transformer is grounded；
When input voltage increases, the rectified module of transformer both end voltage provides negative pressure, filtered mould in negative pressure generation module
After block removal interference, and the voltage range of control chip functions pin is reduced by taking out electric module, make constant output current.
8. dimming driver according to claim 7, which is characterized in that the negative pressure generation module further includes rectification mould
Block, one end of the rectification module are connect with filter module, and the other end of the rectification module is connect with transformer；The rectification
Module is rectifier diode or transistor or field-effect tube；The electricity module of taking out is divider resistance；Filter module includes charging electricity
Resistance and filter capacitor, the plus earth of the filter capacitor, the cathode of the filter capacitor are connect with charging resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026427.2A CN106912140B (en) | 2017-01-13 | 2017-01-13 | A kind of control chip functions pin expands circuit and dimming driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026427.2A CN106912140B (en) | 2017-01-13 | 2017-01-13 | A kind of control chip functions pin expands circuit and dimming driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106912140A CN106912140A (en) | 2017-06-30 |
| CN106912140B true CN106912140B (en) | 2018-07-03 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007080828A1 (en) * | 2006-01-10 | 2007-07-19 | Rohm Co., Ltd. | Negative output regulator circuit and electric device using same |
| CN101868093B (en) * | 2010-06-08 | 2012-11-28 | 友达光电股份有限公司 | Driving circuit used for current driving element and luminous device |
| CN104284474B (en) * | 2013-07-10 | 2017-08-15 | 戴泺格集成电路（天津）有限公司 | LED driver controller, LED driver and LED driving methods |
| CN204258274U (en) * | 2014-10-28 | 2015-04-08 | 西安科技大学 | A kind of overvoltage of wide input voltage range Switching Power Supply and under-voltage protecting circuit |
| CN206421259U (en) * | 2017-01-13 | 2017-08-18 | 浙江凯耀照明股份有限公司 | A kind of control chip expands circuit |
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| CN106912140A (en) | 2017-06-30 |
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Address after: 314415, Haining District, Zhejiang City, Jianshan province Jiaxing listening to tide Road, No. 12 Patentee after: Zhejiang kaiyao Lighting Co., Ltd Address before: 314415, Haining District, Zhejiang City, Jianshan province Jiaxing listening to tide Road, No. 12 Patentee before: Zhejiang Kaiyao Lighting Co., Ltd. |
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