CN202617008U - Frequency modulation control circuit realized by using SG3525 chip - Google Patents
Frequency modulation control circuit realized by using SG3525 chip Download PDFInfo
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- CN202617008U CN202617008U CN2012202318424U CN201220231842U CN202617008U CN 202617008 U CN202617008 U CN 202617008U CN 2012202318424 U CN2012202318424 U CN 2012202318424U CN 201220231842 U CN201220231842 U CN 201220231842U CN 202617008 U CN202617008 U CN 202617008U
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- frequency modulation
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- modulation control
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- 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
Abstract
The utility model relates to a frequency modulation control circuit realized by using an SG3525 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 SG3525 chip. The frequency modulation control circuit realized by using the SG3525 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 SG3525 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 SG3525.
The output of said isolated drive circuit is through 6 pin of the first frequency modulation resistance (R17) connection SG3525, and 6 pin are through second frequency modulation resistance (R18) ground connection, and 5 pin are through first frequency modulation electric capacity (C18) 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 SG3525 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, and 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 6 pin of pwm chip UG3525 through frequency modulation resistance R 17; 5 pin of one termination pwm chip UG3525 of frequency modulation electric capacity, other end ground connection GND-P.
Load R9 changes, and the voltage of sampling resistor R11 changes, and makes itself and set-point VREF relatively; Produce error signal through the PI regulating circuit; This error signal control optocoupler OT1 output stream is crossed the electric current of frequency modulation resistance R 17, in fact just is equivalent to the size that changes frequency modulation resistance R 17, the driving frequency of exporting with regard to adjustable chip SG3525 like this; Thereby the change DC current gain makes the load variations tracing preset.Wherein R18 and frequency modulation capacitor C 18 determine its minimum frequency of operation, and behind the optocoupler OT1 saturation conduction, frequency modulation resistance R 17 determines its maximum operation frequencies with R18 parallel connection value and frequency modulation capacitor C 18.1 pin of control chip SG3525 links to each other with 9 pin, and 2 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 SG3525 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 SG3525.
2. a kind of frequency modulation control circuit that uses the SG3525 chip to realize according to claim 1; It is characterized in that; The output of said isolated drive circuit connects 6 pin of SG3525 through the first frequency modulation resistance (R17); 6 pin are through second frequency modulation resistance (R18) ground connection, and 5 pin are through first frequency modulation electric capacity (C18) ground connection.
3. a kind of frequency modulation control circuit that uses the SG3525 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 SG3525 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 SG3525 chip to realize according to claim 4 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 |
|---|---|---|---|
| CN2012202318424U CN202617008U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using SG3525 chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202318424U CN202617008U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using SG3525 chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617008U true CN202617008U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202318424U Expired - Fee Related CN202617008U (en) | 2012-05-22 | 2012-05-22 | Frequency modulation control circuit realized by using SG3525 chip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441673A (en) * | 2013-08-20 | 2013-12-11 | 东莞市力与源电器设备有限公司 | Multi-module parallel operation method of large-power positive and negative reversing pulse power source |
| CN105472809A (en) * | 2015-12-11 | 2016-04-06 | 江苏固立得精密光电有限公司 | High-constant-current ultraviolet control circuit |
| CN106130326A (en) * | 2016-07-22 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
| CN106411141A (en) * | 2016-06-28 | 2017-02-15 | 东文高压电源（天津）股份有限公司 | High-voltage DC power supply circuit with fixed frequency, fixed pulse width and input amplitude modulation control |
-
2012
- 2012-05-22 CN CN2012202318424U patent/CN202617008U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441673A (en) * | 2013-08-20 | 2013-12-11 | 东莞市力与源电器设备有限公司 | Multi-module parallel operation method of large-power positive and negative reversing pulse power source |
| CN103441673B (en) * | 2013-08-20 | 2016-01-20 | 东莞市力与源电器设备有限公司 | A kind of multimode parallel operation method of high-power positive and negative commutating pulse power supply |
| CN105472809A (en) * | 2015-12-11 | 2016-04-06 | 江苏固立得精密光电有限公司 | High-constant-current ultraviolet control circuit |
| CN106411141A (en) * | 2016-06-28 | 2017-02-15 | 东文高压电源（天津）股份有限公司 | High-voltage DC power supply circuit with fixed frequency, fixed pulse width and input amplitude modulation control |
| CN106411141B (en) * | 2016-06-28 | 2018-11-30 | 东文高压电源（天津）股份有限公司 | A kind of fixed frequency, fixed pulse width, the high voltage direct current source circuit for inputting amplitude adjustment control |
| CN106130326A (en) * | 2016-07-22 | 2016-11-16 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
| CN106130326B (en) * | 2016-07-22 | 2018-08-28 | 东文高压电源（天津）股份有限公司 | A kind of full-bridge LLC resonance isolation high-power high-voltage power circuit |
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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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131203 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee after: Xuji Electric Co., Ltd. Patentee after: Xuji Electric Power Co., Ltd. Patentee after: State Grid Shandong Electric Power Company Patentee after: Qingdao Power Supply Company, State Grid Shandong Electric Power Company Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee before: Xuji Group Co., Ltd. Patentee before: Xuji Electric Power Co., Ltd. Patentee before: Shandong Electric Power Corp. Patentee before: Qingdao Power Supply Co., Ltd., Shandong Electric Power Corporation |
|
| 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: 20121219 Termination date: 20200522 |