CN202617007U - Frequency modulation control circuit realized by using UC3846 chip - Google Patents
Frequency modulation control circuit realized by using UC3846 chip Download PDFInfo
- Publication number
- CN202617007U CN202617007U CN201220231841XU CN201220231841U CN202617007U CN 202617007 U CN202617007 U CN 202617007U CN 201220231841X U CN201220231841X U CN 201220231841XU CN 201220231841 U CN201220231841 U CN 201220231841U CN 202617007 U CN202617007 U CN 202617007U
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency modulation
- chip
- output
- modulation control
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The utility model relates to a frequency modulation control circuit realized by using a UC3846 chip. The frequency modulation control circuit includes an LLC resonance H bridge inverter. A secondary side of an output transformer is connected with a full wave rectifier circuit. An output terminal of the full wave rectifier circuit is provided with a series voltage dividing sampling circuit. A voltage dividing point signal controls an isolation driving circuit via a PI adjusting circuit. An output terminal of the isolation driving circuit is connected with a frequency modulation input terminal of a PWM control chip. An output terminal of the PWM control chip controls power tubes which are connected with the LLC resonance H bridge inverter via a driving circuit. The PWM control chip is the UC3846 chip. The frequency modulation control circuit realized by using the UC3846 chip can solve the problem of imperfect function existing in a conventional LLC resonance converter.
Description
Technical field
The utility model relates to power supply control technology field, particularly a kind of frequency modulation control circuit that adopts pwm chip.
Background technology
Growing along with power electronic technology; Convertor device develops into inexorable trend to high frequencyization, miniaturization, high power densityization; The LLC harmonic technology can well satisfy above-mentioned requirements, yet the defencive function of existing frequency modulation control chip is perfect not enough.The pwm chip excellent performance, required peripheral components is less, defencive function is quite perfect, ripe use more.
The utility model content
The purpose of the utility model provides a kind of frequency modulation control circuit that adopts pwm chip, in order to solve the perfect inadequately problem of prior art LLC controlled resonant converter function.
For realizing above-mentioned purpose; The scheme of the utility model is: the frequency modulation control circuit that a kind of UC3846 of use chip is realized; Comprise a LLC resonance H bridge inverter; Its output transformer secondary connects a full-wave rectifying circuit, and the output of said full-wave rectifying circuit is provided with the series connection pressure sampling circuit, and the dividing point signal is through isolated drive circuit of a PI regulating circuit control; The output of this isolated drive circuit is connected to the frequency modulation input of a pwm chip, and the output of pwm chip is through each power tube of the said LLC resonance of drive circuit control connection H bridge inverter; Said pwm chip is UC3846.
The output of said isolated drive circuit connects 8 pin of UC3846, and 8 pin are through frequency modulation electric capacity (C18) ground connection, and 9 pin are through a frequency modulation resistance (R18) ground connection.
Said isolated drive circuit is a photoelectric coupled circuit.
Said full-wave rectifying circuit is control rectifying circuit not,
Said full-wave rectifying circuit also is provided with filter circuit.
The utility model is regulated the output of pwm chip according to the variation of load, and the driving power pipe is to realize frequency modulation.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
A kind of circuit that adopts the UC3846 control chip to realize frequency modulation control as shown in Figure 1; Comprise a LLC resonance H bridge inverter; Its output transformer secondary connects a full-wave rectifying circuit; The output of said full-wave rectifying circuit is provided with the series connection pressure sampling circuit; The dividing point signal is through isolated drive circuit of a PI regulating circuit control, and the output of this isolated drive circuit is connected to the frequency modulation input of a pwm chip, and the output of pwm chip is through each power tube of the said LLC resonance of drive circuit control connection H bridge inverter.
LLC resonance H bridge inverter comprises power tube Q1---Q4, resonant capacitance Cr, resonant inductance Lr, transformer T1, full-wave rectifying circuit for control rectifying circuit not (D5, D6).Power tube Q3, its series connection point of Q4 series connection back are successively through resonant capacitance Cr, resonant inductance Lr, the former edge joint power tube of transformer T1 Q1, Q2 series connection point; The secondary two ends of transformer T1 link to each other with the anode of rectifier diode D5 and D6 respectively; Centre cap ground connection GND; The negative electrode of rectifier diode D5 and D6 connects the positive pole of electrochemical capacitor E1, the minus earth GND of electrochemical capacitor, and thin-film capacitor C5 and load R9 are connected in parallel on the two ends of electrochemical capacitor E1; The series connection pressure sampling circuit comprises the divider resistance R10 and the sampling resistor R11 of series connection; The end of divider resistance R10 links to each other with the end of output with feedforward resistance R 12; The other end links to each other with feed-forward capacitance C12 one end with sampling resistor R11, and the other end of feedforward resistance R 12 links to each other with the other end of feed-forward capacitance.The PI regulating circuit comprises amplifier U2A, regulates resistance R 13, and its input one end connects given voltage VREF, and an end connects the sampled point of sampling resistor R11; The output of amplifier U2A connects optocoupler OT1; Optocoupler OT1 control input links to each other with the end of pull-up resistor R14; The other end links to each other with the output of amplifier U2A, an end ground connection GND-P of optocoupler OT1 control output, and the other end connects 8 pin of PWM Current Control chip UC3846 through frequency modulation capacitor C 18; 9 pin of one termination PWM Current Control chip UC3846 of frequency modulation resistance R 18, other end ground connection GND-P.
Load R9 changes; The voltage of sampling resistor R11 changes, and makes itself and set-point VREF relatively, produces error signal through the PI regulating circuit; This error signal control optocoupler OT1 output pours into or extracts out the electric current of frequency modulation capacitor C 18; The driving frequency of exporting with regard to adjustable chip UC3846 like this, thus DC current gain changed, make the load variations tracing preset.Wherein frequency modulation R18 determines its maximum operation frequency.6 pin of control chip UC3846 link to each other with 7 pin, and 9 pin ground connection GND-P make output drive full duty ratio.
Among this paper embodiment is set forth, above embodiment just is used to help to understand the method and the core concept of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on practical implementation and range of application, all can change is summarized saidly, and this description should not be construed as the restriction to the utility model.
Claims (5)
1. frequency modulation control circuit that uses the UC3846 chip to realize; Comprise a LLC resonance H bridge inverter; Its output transformer secondary connects a full-wave rectifying circuit; It is characterized in that the output of said full-wave rectifying circuit is provided with the series connection pressure sampling circuit, the dividing point signal is through isolated drive circuit of a PI regulating circuit control; The output of this isolated drive circuit is connected to the frequency modulation input of a pwm chip, and the output of pwm chip is through each power tube of the said LLC resonance of drive circuit control connection H bridge inverter; Said pwm chip is UC3846.
2. a kind of frequency modulation control circuit that uses the UC3846 chip to realize according to claim 1; It is characterized in that; The output of said isolated drive circuit connects 8 pin of UC3846, and 8 pin are through frequency modulation electric capacity (C18) ground connection, and 9 pin are through a frequency modulation resistance (R18) ground connection.
3. a kind of frequency modulation control circuit that uses the UC3846 chip to realize according to claim 1 is characterized in that said isolated drive circuit is a photoelectric coupled circuit.
4. a kind of frequency modulation control circuit that uses the UC3846 chip to realize according to claim 1 is characterized in that, said full-wave rectifying circuit is control rectifying circuit not.
5. a kind of frequency modulation control circuit that uses the UC3846 chip to realize according to claim 1 is characterized in that said full-wave rectifying circuit also is provided with filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220231841XU CN202617007U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using UC3846 chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220231841XU CN202617007U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using UC3846 chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617007U true CN202617007U (en) | 2012-12-19 |
Family
ID=47350676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220231841XU Expired - Fee Related CN202617007U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using UC3846 chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202617007U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505927A (en) * | 2014-12-18 | 2015-04-08 | 广东易事特电源股份有限公司 | Flyback charging circuit, and control method and device for flyback charging circuit |
| CN108282091A (en) * | 2017-12-29 | 2018-07-13 | 河南北瑞电子科技有限公司 | A kind of pulse width modulation apparatus for Switching Power Supply |
| CN110168883A (en) * | 2017-01-27 | 2019-08-23 | 株式会社村田制作所 | The 120-HZ ripple of LLC converter is reduced using PIR controller |
-
2012
- 2012-05-22 CN CN201220231841XU patent/CN202617007U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505927A (en) * | 2014-12-18 | 2015-04-08 | 广东易事特电源股份有限公司 | Flyback charging circuit, and control method and device for flyback charging circuit |
| CN110168883A (en) * | 2017-01-27 | 2019-08-23 | 株式会社村田制作所 | The 120-HZ ripple of LLC converter is reduced using PIR controller |
| US10944317B2 (en) | 2017-01-27 | 2021-03-09 | Murata Manufacturing Co., Ltd. | 120-Hz ripple reduction with PIR controller for LLC converter |
| CN110168883B (en) * | 2017-01-27 | 2022-02-01 | 株式会社村田制作所 | LLC converter controlled by PIR and method for controlling LLC converter |
| CN108282091A (en) * | 2017-12-29 | 2018-07-13 | 河南北瑞电子科技有限公司 | A kind of pulse width modulation apparatus for Switching Power Supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205377693U (en) | Output current continuously adjustable high efficiency switching power supply | |
| CN106100344A (en) | A kind of LLC resonant converter with liter high voltage gain | |
| CN202617008U (en) | Frequency modulation control circuit realized by using SG3525 chip | |
| CN104393762A (en) | DC-DC (direct current to direct current) converter circuit with high step-up ratio based on wireless electric energy transmission | |
| CN204652713U (en) | A kind of LED drive power of no electrolytic capacitor | |
| CN202617007U (en) | Frequency modulation control circuit realized by using UC3846 chip | |
| CN205407613U (en) | Monopole high power factor recommends two circuit that are just swashing | |
| CN104393783A (en) | Dielectric barrier discharge type ozone generator power supply with constant peak voltage and current | |
| CN202652073U (en) | Switch power supply circuit capable of realizing output constant current control | |
| CN104407660B (en) | Online integrated high precision constant current source | |
| CN103441690B (en) | Method for controlling combined converter for achieving tight adjusting output with high-frequency alternating-current side connected in series | |
| CN106487234B (en) | The output power control method of the flyback converter of electric current blend modes of operation | |
| CN204858973U (en) | Isolation feedback supply circuit of LLC resonant transformation ware | |
| CN202178715U (en) | AC-DC power conversion chip and power conversion circuit | |
| CN204103577U (en) | Online integrated switch mode constant current charger | |
| CN205195567U (en) | Novel LC series resonance DCDC converter and power electronic device | |
| CN204013231U (en) | A kind of boosted switch power supply | |
| CN209105035U (en) | DC-DC step-down isolation circuit | |
| CN204215302U (en) | Online integrated high precision constant current source | |
| CN204408192U (en) | A kind of switch power voltage-stabilizing circuit | |
| CN207819786U (en) | A kind of isolated power supply topological circuit of High Power Factor | |
| CN204334355U (en) | A kind of wide input isolated form three road output switch power source | |
| CN106329939B (en) | A kind of switching power converters | |
| CN104158402A (en) | Novel boost switching power supply | |
| CN204271919U (en) | A kind of power adapter of IFD purifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee after: XJ Group Corp. Patentee after: XJ POWER Co.,Ltd. Patentee after: STATE GRID SHANDONG ELECTRIC POWER Co. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee before: XJ Group Corp. Patentee before: XJ POWER Co.,Ltd. Patentee before: SHANDONG ELECTRIC POWER Corp. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131202 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee after: XJ ELECTRIC Co.,Ltd. Patentee after: XJ POWER Co.,Ltd. Patentee after: STATE GRID SHANDONG ELECTRIC POWER Co. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee before: XJ Group Corp. Patentee before: XJ POWER Co.,Ltd. Patentee before: STATE GRID SHANDONG ELECTRIC POWER Co. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20200522 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |