CN206421259U - A kind of control chip expands circuit - Google Patents
A kind of control chip expands circuit Download PDFInfo
- Publication number
- CN206421259U CN206421259U CN201720043187.2U CN201720043187U CN206421259U CN 206421259 U CN206421259 U CN 206421259U CN 201720043187 U CN201720043187 U CN 201720043187U CN 206421259 U CN206421259 U CN 206421259U
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- China
- Prior art keywords
- module
- control chip
- transformer
- negative pressure
- resistance
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Abstract
Circuit is expanded the utility model discloses a kind of control chip, including takes out electric module and negative pressure generation module, the functional pin connection of described one end for taking out electric module and control chip, the other end for taking out electric module is connected with negative pressure generation module；The negative pressure generation module includes filtration module and transformer, and one end of the filtration module is connected with one end of the transformer, and the other end of the other end of the filtration module and the transformer is grounded.Using the utility model, the scope of control chip functional pin operating voltage have adjusted.
Description
Technical field
The utility model is related to a kind of circuit, particularly control chip expanded and expands circuit.
Background technology
As country widelys popularize to energy-conserving product, market is increasing to the demand of D/C power and LED driver.
Under various changes in demand, power supply and LED driver access a variety of different loads, or expand bringing onto load scope or expand input electricity
Press under the states such as scope.At present, because the operating voltage range of control chip functional pin is relatively low, it is impossible to meet and expand load
It is required that, therefore generally realize that above-mentioned expansion band carries scope or expands voltage using increase control chip or the complicated circuit of increase
The particular/special requirement of scope, considerably increases the cost of product.Therefore, in the urgent need to a kind of control chip functional pin operating voltage
Adjustment circuit carrys out the operating voltage range of expanded functionality pin.
Utility model content
The purpose of this utility model provides a kind of control chip and expands circuit, expands the work of control chip functional pin
Voltage range, reduces product cost.
To solve the problem of prior art is present, the utility model provides a kind of control chip functional pin operating voltage and adjusted
Whole circuit, the circuit includes：Take out electric module and negative pressure generation module, the function of described one end and control chip for taking out electric module
Pin is connected, and the other end for taking out electric module is connected with negative pressure generation module；The negative pressure generation module includes filtration module
And transformer, one end of the filtration module is connected with one end of the transformer, the other end of the filtration module and institute
The other end for stating transformer is grounded.
The technical program produces negative pressure and the controlling switch by taking out electric module and control chip using negative pressure generation module
Connection, therefore negative pressure is superimposed upon on the functional pin of control chip, the operating voltage of control chip functional pin is reduced, is adjusted
The whole scope of control chip functional pin operating voltage, enhances the load capacity of control chip, improves control chip
Performance.In addition, by filtration module filtering interference signals, improving the delivery efficiency of negative pressure generation module.
In addition, the negative pressure generation module also includes rectification module, one end of the rectification module is connected with filtration module,
The other end of the rectification module is connected with transformer.
In addition, the rectification module is commutation diode or transistor or FET.
In addition, described take out electric module for divider resistance.
In addition, described take out electric module including multiple divider resistances, the multiple divider resistance is using side in parallel or series
Formula is connected with each other.Therefore, the resistance that can adjust resistance according to actual conditions facilitates practical application.
In addition, the filtration module includes charging resistor and filter capacitor, the plus earth of the filter capacitor is described
The negative pole of filter capacitor is connected with charging resistor.Current limliting is carried out using charging resistor protective effect is served to filter capacitor.
In addition, the filter capacitor includes multiple electric capacity, the connected mode of the multiple electric capacity for it is in parallel and or series connection；
The charging resistor includes multiple resistance, the connected mode of the multiple resistance for it is in parallel and or series connection.Actual application
In, the combination of multiple electric capacity can be used, practical application is facilitated.
In addition, the transformer includes one or more inductance, the inductance includes one or more windings.It therefore, it can
The quantity of the winding of inductance is adjusted according to actual conditions, the flexibility of circuit is improved.
The negative pressure that the utility model embodiment is produced using negative pressure generation module, which is superimposed upon, needs the chip functions controlled to draw
On pin, the operating voltage of control chip functional pin is reduced, and then have adjusted the model of control chip functional pin operating voltage
Enclose, enhance the load capacity of control chip, improve the performance of control chip.
Brief description of the drawings
Fig. 1 is the first embodiment schematic diagram that a kind of control chip of the utility model expands circuit；
Fig. 2 is second of embodiment schematic diagram that a kind of control chip of the utility model expands circuit；
Fig. 3 is the circuit theory schematic diagram for the dimming driver that a kind of control chip of the utility model expands circuit application.
Embodiment
The utility model is described in detail below in conjunction with the accompanying drawings.
With reference to Fig. 1, the figure is a kind of schematic diagram for embodiment that a kind of control chip of the utility model expands circuit, the tune
Whole circuit includes：The electric negative pressure generation module 20 of module 10 is taken out, one end of electric module 10 is taken out and the functional pin of control chip is connected,
The other end for taking out electric module 10 is connected with negative pressure generation module 20；Negative pressure generation module 20 includes filtration module 21 and transformer
22, one end of filtration module 21 is connected with one end of the transformer 22, the other end of filtration module 21 and transformer 22 it is another
One end is grounded；When input voltage is raised, the filtration module 21 of negative pressure generation module 20 interacts with transformer 22 to be produced
Negative voltage, and be load supplying after taking out the electric reduction of module 10 negative voltage, and export constant output current.
The technical program produces negative voltage using negative pressure generation module, and takes out electricity by charging module progress, that is, is born
On the functional pin for acting on control chip after to partial pressure, so as to drag down the minimum electricity of control chip functional pin operating voltage
Pressure, expands the scope of functional pin operating voltage, expands the load capacity of control chip.
With reference to Fig. 2, the figure is the schematic diagram for second of embodiment that a kind of control chip of the utility model expands circuit, with
Unlike first embodiment, it can be to take out resistance RS71 that electric module is taken out in the present embodiment, and it can be basis that this, which takes out resistance,
A resistance of selection is actually needed, multiple resistance can also be included, the plurality of resistance can be by the way of serial or parallel connection
It is attached；In addition, filtration module includes charging resistor RS72 and filter capacitor C71；Transformer can be inductance coil L41；
Furthermore it is also possible to including the adapter DS71 of rectification two.
Take out resistance RS71 one end and the functional pin HOLD of control chip is attached, take out the another of resistance RS71
End is connected with filter capacitor C71 with charging resistor RS72 common port, filter capacitor C71 negative pole and the one of charging resistor RS72
End connection, the charging resistor RS72 other end is connected with rectification diode DS71 anode, commutation diode DS71 negative electrode and
Inductance coil L41B one end connection, inductance coil L41B other end ground connection, filter capacitor C71 plus earth.
The technical program is superimposed negative pressure in HOLD pins, adjusts the size of negative pressure supplying resistance resistance, can adjust negative pressure
Take out the size of electric current., will with voltage on current system reduction HOLD pin is taken out when input voltage is 200V by HOLD pin voltages
Voltage is taken out by 0.3V and drops to 0.29V.When input voltage is in 250V, HOLD pin voltage, which is further taken out, drops to 0.15V.Widen
HOLD pin external feedback voltage ranges, output current is constant at 500mA.When input voltage, which is further walked, is lifted to 277V,
HOLD pin 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.Can be by chip secure operating voltage range
Accomplish, during input voltage 320V, HOLD pin minimum voltage is in -0.2V, requirement of the constant output current in 500mA.With not connecting
The adjustment circuit for connecing the technical program is compared, and the negative pressure of HOLD pins extend to -0.2-5.5V from 0.3-5.5.So as to by electricity
Application 0-230V is pressed, 0-320V is extended to.And full voltage input 0-305V is solved, during middle appearance " generator " state,
The uncontrolled situation of output current." generator " state mentioned herein, after referring to power network due to cause specific power-off, using hair
Motor is powered or line voltage is risen to the process of rated voltage by low-voltage.
The adjustment circuit in the utility model embodiment is applied exemplified by LED dimming drivers to the utility model below
It is described in detail.Wherein the dimming driver uses 42V 500I 120-277V single stage type thyristor regulating CD-ROM drivers, should
Dimming driver Fairchild（Fly million）Single-stage brightness adjustment control chip FL7734.
With reference to shown in Fig. 3, the figure is that control chip of the present utility model expands the circuit that circuit is applied to dimming driver
The embodiment of control chip functional pin in principle schematic, the circuit theory schematic diagram, with second embodiment identical
Fang Shi, takes out resistance and remains as RS71, filter capacitor remains as C71, and commutation capacitor is still DS71；Difference is, charges
Resistance includes RS72A and RS72B, and the inductance coil that transformer is used includes three windings L41A, L41B and L41C, wherein it is each around
The no-load voltage ratio for hindering L41A, L41B and L41C is certain, with the lifting of input voltage, and voltage similarly rises due to existing between winding
Use parameter reason, 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 electric capacity charging, charging voltage about 6V to-
130V or so.
After input voltage is being opened less than 80V, chip FL7734 works into light-modulating mode, and output current is 500mA.
The minimum dimension of output current when resistance RS37 both end voltages about 5.5V, resistance RS37 resistances can adjust minimum angles on HOLD pins
Hold electric current.Electric capacity CS35 filters out high-frequency interferencing signal.Filter capacitor C71 two ends about -10V voltages, through taking out resistance RS71 reductions
Electric capacity CS35 both end voltages, because charging resistor RS71 resistances are very big, -10V voltage drops substantially to CS35 electric capacity both end voltage without
Any influence.Input voltage is further up when reaching 200V, and electric capacity C71 both end voltages further decline up to -90V or so, passes through
Resistance RS71 takes out electric current, and electric capacity CS35 both end voltages drop to 0.29V.When voltage is in 250V, electric capacity CS35 both end voltages enter one
Step, which is taken out resistance RS71 and taken out, drops to 0.15V.HOLD pin external feedback voltage ranges are widened, output current is constant at
500mA.When input voltage, which is further walked, is lifted to 277V, electric capacity C71 both end voltages further decline up to -120V or so, electric capacity
CS35 both end voltages, which are further taken out resistance RS71 and taken out, drops to -0.1V, and output current is constant at 500mA.Input voltage
During 320V, electric capacity CS35 both end voltages are in -0.2V, requirement of the constant output current in 500mA.
Applied by the control chip functional pin operating voltage adjustment circuit in the utility model embodiment in control core
On piece FL7734 HOLD pins, by the functional pin voltage range from 0.3-5.5V, -0.2-5.5V is extended to.So as to by electricity
Application 0-230V is pressed, 0-320V is extended to.And solve the uncontrolled situation of output current.
Explanation is needed, though AC AC powers, rectifying tube have more been used herein, power vd D, take out drop, " generator "
Deng term, but it is not precluded from the possibility using other terms.Conciliate using these terms just for the sake of more easily description
Release essence of the present utility model.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and moistened
Decorations are also considered as protection domain of the present utility model.
Claims (8)
1. a kind of control chip expands circuit, it is characterised in that described to take out electric mould including taking out electric module and negative pressure generation module
One end of block and the functional pin of control chip are connected, and the other end for taking out electric module is connected with negative pressure generation module；It is described
Negative pressure generation module includes filtration module and transformer, and one end of the filtration module is connected with one end of the transformer,
The other end of the other end of the filtration module and the transformer is grounded.
2. control chip according to claim 1 expands circuit, it is characterised in that the negative pressure generation module also includes whole
Flow module, one end of the rectification module is connected with filtration module, and the other end of the rectification module is connected with transformer.
3. control chip according to claim 2 expands circuit, it is characterised in that the rectification module is commutation diode
Or transistor or FET.
4. control chip according to claim 1 expands circuit, it is characterised in that described to take out electric module for divider resistance.
5. control chip according to claim 1 expands circuit, it is characterised in that described to take out electric module and include multiple partial pressures
Resistance, the multiple divider resistance is connected with each other by the way of in parallel or series.
6. control chip according to claim 1 expands circuit, it is characterised in that the filtration module includes charging resistor
And filter capacitor, the plus earth of the filter capacitor, the negative pole of the filter capacitor is connected with charging resistor.
7. control chip according to claim 6 expands circuit, it is characterised in that the filter capacitor includes multiple electricity
Hold, the connected mode of the multiple electric capacity for it is in parallel and or series connection；The charging resistor includes multiple resistance, the multiple electricity
The connected mode of resistance for it is in parallel and or series connection.
8. the control chip according to any one of claim 1-7 expands circuit, it is characterised in that the transformer includes
One or more inductance, the inductance includes one or more windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720043187.2U CN206421259U (en) | 2017-01-13 | 2017-01-13 | A kind of control chip expands circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720043187.2U CN206421259U (en) | 2017-01-13 | 2017-01-13 | A kind of control chip expands circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206421259U true CN206421259U (en) | 2017-08-18 |
Family
ID=59571834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720043187.2U Expired - Fee Related CN206421259U (en) | 2017-01-13 | 2017-01-13 | A kind of control chip expands circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206421259U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106912140A (en) * | 2017-01-13 | 2017-06-30 | 浙江凯耀照明股份有限公司 | A kind of control chip functional pin expands circuit and dimming driver |
| CN113110677A (en) * | 2021-05-27 | 2021-07-13 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
-
2017
- 2017-01-13 CN CN201720043187.2U patent/CN206421259U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106912140A (en) * | 2017-01-13 | 2017-06-30 | 浙江凯耀照明股份有限公司 | A kind of control chip functional pin expands circuit and dimming driver |
| CN113110677A (en) * | 2021-05-27 | 2021-07-13 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| CN113110677B (en) * | 2021-05-27 | 2022-05-27 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| US11711075B2 (en) | 2021-05-27 | 2023-07-25 | Guangdong University Of Technology | Low-power consumption negative voltage generator for radio frequency switches |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170818 Termination date: 20220113 |