CN202550877U - High-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip - Google Patents
High-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip Download PDFInfo
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- CN202550877U CN202550877U CN2011205655389U CN201120565538U CN202550877U CN 202550877 U CN202550877 U CN 202550877U CN 2011205655389 U CN2011205655389 U CN 2011205655389U CN 201120565538 U CN201120565538 U CN 201120565538U CN 202550877 U CN202550877 U CN 202550877U
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Abstract
The utility model relates to a high-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip. The power supply chip is characterized by comprising a biasing circuit which is used for supplying electricity to a circuit inside the chip; a constant current output loop is connected with the biasing circuit, is used for collecting feedback signals outside the chip and outputting constant-current signals after comparison; a constant-voltage output loop is connected with the biasing circuit, and used for collecting feedback signals outside the chip and looking up the table internally after amplification; an output constant-voltage signal over-voltage over-current protection circuit is connected with the biasing circuit, the constant-current output loop and the constant-voltage output loop, and used for protecting over voltage and over current; and an output stage drive circuit is connected with the over-voltage over-current protection circuit, the biasing current, the constant-current output loop and the constant-voltage output loop, and used for outputting a constant-voltage signal or a constant-current signal. The high-efficiency primary side feedback AC/DC power supply chip is applied to the mobile phone charger and LED (light emitting diode) illumination, so that optocoupler, 431 and other devices can be saved by virtue of the application scheme due to the primary side feedback which is a novel power supply control technology, and the system is greatly reduced; and the output voltage is sampled from an over auxiliary coil so as to obtain constant current/constant voltage accuracy within 5 percent.
Description
Technical field
The utility model designing integrated circuit chip relates in particular to the former limit of a kind of high efficiency feedback AC/DC power supply chip.
Background technology
In the today of advocating the energy-saving and emission-reduction green energy resource, a large amount of mobile phones, digital camera, the energy that charger and adapter consumed of portable electric appts such as notebook computer can not be ignored.The a lot of power standards of industry comprise that Energy Star EPS v2.0 has proposed up-to-date requirement to the efficient of lower wattage power supply.Such as, the up-to-date power standard of US and European all requires adapter to have higher average efficiency clearly, must all will satisfy certain efficient requirement under 75% and 100% load condition 25%, 50%, and its peak demand is more than 68.2%.
Simultaneously, industry comprises the PSR performance of products: the CV precision, and the CC precision, the output line voltage-drop compensation, inductance compensation, input AC compensation etc. require also increasingly highly, and unloaded stand-by power consumption have been proposed more to strictly regulate.When the standard of the 150mW of EU Committee stand-by power consumption 2011 is formally effective; LG, Motorola, Nokia, Samsung, Sony Ericsson five big cell phone manufacturers unite the requirement stand-by power consumption and need reduce to 30mW, and to formulate new five-pointed star standard :≤30mW in view of the above be five-star, and 30mW – 150mW is four-star; 150mW-250mW is three-star; 250mW-350mW is two stars, and 350mW-500mW is a star, and＞500mW does not have star.
On the basis of new five-pointed star standard criterion, develop and PSR of new generation, its characteristic feature be exactly stand-by power consumption less than 0.03W, and have the efficient height, the constant current constant voltage precision is high, characteristics such as built-in various compensate functions.PSR product of new generation in the market is still rarely found; Basically all be in and grind or try the stage of pushing away; And its key technology is mainly grasped in American-European major company hands such as PI, IWATT, the domestic part IC company design PSR chip of new generation that begun one's study, but still fail formally to release Related product.
Summary of the invention
For addressing the above problem, the utility model provides the former limit of a kind of high efficiency of high-accuracy high-efficiency rate feedback AC/DC power supply chip.
For achieving the above object, the technical scheme that the utility model adopts is: the former limit of high efficiency feedback AC/DC power supply chip, and it is characterized in that comprising: biasing circuit is used to the chip internal circuit power supply is provided;
Constant current output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, relatively back output constant current signal;
Constant voltage output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, amplifies inside, back and tables look-up, output constant voltage signal;
Over-voltage over-current protection circuit is connected with biasing circuit, constant current output loop, constant voltage output loop, is used for overvoltage, overcurrent protection;
The output stage drive circuit is connected with over-voltage over-current protection circuit, biasing circuit, constant current output loop, constant voltage output loop, is used to export constant voltage signal or constant current signal.
First preferred version of the utility model is, comprises that also the voltage peak control circuit is connected with constant voltage output loop, constant current output loop, is used to gather outside primary current voltage.
Second preferred version of the utility model is; Described constant current output loop comprises comparator, Tons detection circuit, constant current cc control circuit, cable compensation circuit; Described Tons detection circuit is connected with comparator, constant current CC control circuit, and described cable compensation circuit connects the Tons detection circuit.
The 3rd preferred version of the utility model is that described constant voltage output loop comprises error amplifier, constant voltage CV control circuit.
The technical advantage of the utility model is: be applied to charger for mobile phone and LED illumination, owing to adopted former limit this novel power supply control technology of feedback, its application scheme has been saved devices such as optocoupler and 431, greatly reduces system cost; Simultaneously, it obtains 5% with interior constant current/constant voltage precision from crossing the ancillary coil sampling and outputting voltage.
Below in conjunction with accompanying drawing and specific embodiment the utility model is further specified.
Description of drawings
Fig. 1 is a present embodiment chip internal module map.
Fig. 2 is a present embodiment chip exterior structure chart.
Embodiment
With reference to figure 1, the former limit of high efficiency feedback AC/DC power supply chip, biasing circuit is used to the chip internal circuit power supply is provided; Constant current output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, relatively back output constant current signal; Constant voltage output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, amplifies inside, back and tables look-up, output constant voltage signal;
Over-voltage over-current protection circuit is connected with biasing circuit, constant current output loop, constant voltage output loop, is used for overvoltage, overcurrent protection; The output stage drive circuit is connected with over-voltage over-current protection circuit, biasing circuit, constant current output loop, constant voltage output loop, is used to export constant voltage signal or constant current signal.The voltage peak control circuit is connected with constant voltage output loop, constant current output loop, is used to gather outside primary current voltage.
Constant current output loop comprises comparator, Tons detection circuit, constant current cc control circuit, cable compensation circuit, and described Tons detection circuit is connected with comparator, constant current CC control circuit, and described cable compensation circuit connects the Tons detection circuit.Constant voltage output loop comprises error amplifier, constant voltage CV control circuit.
With reference to figure 2, pin function is explained as follows table:
| Number of pins | The pin title | I/O | Functional description |
| 1 | CS | I | The primary |
| 2 | VCC | - | |
| 3 | OUT | O | External NPN power switch pipe |
| 4 | GND | - | |
| 5 | CPC | I | External line loss building-out |
| 6 | FB | I | Ancillary coil |
| 7 | CPR | O | External line loss compensation |
| 8 | BIAS | I | Reference current is set resistance in the outer contact pin |
With reference to figure 1, Fig. 2, when circuit start, the VCC electrifying startup produced reference voltage and vdd voltage before this, and then outside BIAS circuit and LDO circuit are started working, and last entire chip enables, and constant current output loop and constant voltage output loop are just started working.
Like Fig. 1, chip has two loops and realizes constant current CC output and constant voltage CV output respectively.Constant current output loop is gathered the input of external electric voltage signal feedback through the FB pin; Through comparator and reference voltage relatively after; Export to the Tons detection circuit, the Tons detection circuit obtains opening time T ons and passing to constant current CC control circuit of diode in the external secondary circuit, and constant current CC control circuit is calculation control output cycle T sw in view of the above; Obtain the constant duty ratio Dons of secondary circuit, thereby through output stage drive circuit output constant current.
Constant current output loop is through FB pin sampling external auxiliary coil feedback voltage; Thereby obtain the output voltage of secondary circuit indirectly; Be the feedback voltage that samples and benchmark comparative voltage 4V and relatively obtain error amount; And through error amplifier error amount is amplified, the mode that constant voltage CV control circuit is tabled look-up through inside according to the error amount after amplifying again obtains suitable output cycle T sw.The mode of Cycle by Cycle detection and modulation can obtain excellent load adjustment and transient response like this.
4 state: initial condition IDLE, constant current state CC, pressure constant state CV and guard mode OVPOCP altogether.
Biasing circuit chip for driving after chip VCC voltage is higher than starting resistor 18.5V; After FB signal triggering OVP or OCkP protection, will get into the OVPOCkP state; When detecting feedback signal near the benchmark comparative voltage time, get into the CV operating state, otherwise then get into the CC operating state.
Among Fig. 1, though certain module, signal flow do not make explanations to expression, pin,, to those skilled in the art, be conventional knowledge, if fail to insert, influence those skilled in the art on the contrary and read.
Though the utility model further specifies according to the foregoing description, the invention thought of the utility model is not limited only to this.
Claims (4)
1. the AC/DC power supply chip is fed back on the former limit of high efficiency, and it is characterized in that comprising: biasing circuit is used to the chip internal circuit power supply is provided;
Constant current output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, relatively back output constant current signal;
Constant voltage output loop is connected with biasing circuit, is used for the acquisition chip external feedback signal, amplifies inside, back and tables look-up, output constant voltage signal;
Over-voltage over-current protection circuit is connected with biasing circuit, constant current output loop, constant voltage output loop, is used for overvoltage, overcurrent protection;
The output stage drive circuit is connected with over-voltage over-current protection circuit, biasing circuit, constant current output loop, constant voltage output loop, is used to export constant voltage signal or constant current signal.
2. the former limit of high efficiency according to claim 1 feedback AC/DC power supply chip is characterized in that: comprise that also the voltage peak control circuit is connected with constant voltage output loop, constant current output loop, is used to gather outside primary current voltage.
3. the former limit of high efficiency according to claim 1 and 2 feedback AC/DC power supply chip; It is characterized in that: described constant current output loop comprises comparator, Tons detection circuit, constant current cc control circuit, cable compensation circuit; Described Tons detection circuit is connected with comparator, constant current CC control circuit, and described cable compensation circuit connects the Tons detection circuit.
4. the former limit of high efficiency according to claim 1 and 2 feedback AC/DC power supply chip is characterized in that: described constant voltage output loop comprises error amplifier, constant voltage CV control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205655389U CN202550877U (en) | 2012-08-20 | 2012-08-20 | High-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205655389U CN202550877U (en) | 2012-08-20 | 2012-08-20 | High-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip |
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| Publication Number | Publication Date |
|---|---|
| CN202550877U true CN202550877U (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205655389U Expired - Fee Related CN202550877U (en) | 2012-08-20 | 2012-08-20 | High-efficiency primary side feedback AC/DC (alternating current/direct current) power supply chip |
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| Country | Link |
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| CN (1) | CN202550877U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281588A (en) * | 2015-07-20 | 2016-01-27 | 浙江利尔达物联网技术有限公司 | High-precision primary side feedback-type power supply module and control method thereof |
| CN114167771A (en) * | 2021-11-19 | 2022-03-11 | 瀚昕微电子(无锡)有限公司 | Output drive control circuit for AC-DC controller |
-
2012
- 2012-08-20 CN CN2011205655389U patent/CN202550877U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281588A (en) * | 2015-07-20 | 2016-01-27 | 浙江利尔达物联网技术有限公司 | High-precision primary side feedback-type power supply module and control method thereof |
| CN105281588B (en) * | 2015-07-20 | 2018-06-05 | 浙江利尔达物联网技术有限公司 | A kind of high-precision primary side feedback type power module and its control method |
| CN114167771A (en) * | 2021-11-19 | 2022-03-11 | 瀚昕微电子(无锡)有限公司 | Output drive control circuit for AC-DC controller |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20150820 |
|
| EXPY | Termination of patent right or utility model |