CN201830154U - Logic link control (LLC) series resonance circuit of switching power supply - Google Patents
Logic link control (LLC) series resonance circuit of switching power supply Download PDFInfo
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- CN201830154U CN201830154U CN2010202420955U CN201020242095U CN201830154U CN 201830154 U CN201830154 U CN 201830154U CN 2010202420955 U CN2010202420955 U CN 2010202420955U CN 201020242095 U CN201020242095 U CN 201020242095U CN 201830154 U CN201830154 U CN 201830154U
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- power supply
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- 238000005070 sampling Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The utility model discloses a logic link control (LLC) series resonance circuit of a switching power supply, which comprises a filter rectifier circuit, a power factor correction (PFC) circuit, a PFC control chip, a sampling circuit, an LLC resonance circuit and an LLC control chip. The filter rectifier circuit, the PFC circuit and the LLC resonance circuit are connected sequentially. The PFC control chip is connected to the PFC circuit. The sampling circuit is respectively connected with the PFC circuit and the PFC control chip. The PFC control chip is further connected to the LLC control chip. A comparator is arranged in the PFC control chip. The LLC series resonance circuit of the switching power supply has simple circuits and has higher reliability and efficiency.
Description
Technical field
The utility model relates to field of switch power, relates in particular to a kind of LLC series resonant circuit of Switching Power Supply.
Background technology
In the design of LED Switching Power Supply, adopt LLC series resonance topological structure the main power source output (as 24V output 10A), this topological structure has following advantage: at first, it can regulate output under the situation of input and load wide variation, and switching frequency changes relatively very little simultaneously.The second, it can realize zero voltage switching in the whole service scope.At last, all parasitic antennas comprise the junction capacitance of all semiconductor device and the leakage inductance and the magnetizing inductance of transformer, all are used for realizing zero voltage switching.But this kind circuit also has limitation, exactly the resonant slots input voltage is had certain requirement, has only after this voltage rises to certain altitude, and the operating voltage of chip can add, and zero current switches or chip enters protection etc. otherwise easily enter.
See also Fig. 1, for the LLC series resonant circuit of the Switching Power Supply of prior art comprises filter rectifier, PFC (Power Factor Correction, power factor correction) circuit, PFC control chip, first sample circuit, second sample circuit, LLC resonant circuit and LLC control chip.Filter rectifier, pfc circuit and LLC resonant circuit connect successively.First sample circuit is used for the output voltage of pfc circuit is taken a sample, and feeds back to the PFC control chip, thereby PFC voltage is controlled, to stablize PFC voltage.Second sample circuit is used for PFC voltage is taken a sample, and after PFC voltage rose to certain altitude, second sample circuit control LLC control chip entered mode of operation, thereby drives the work of LLC resonant circuit.
Yet first, second sample circuit is taken a sample to pfc circuit respectively, has caused the multiplicity of circuit to increase, and has reduced reliability, also brings certain loss, and the efficient of power supply reduces when making standby or operate as normal.
The utility model content
The purpose of this utility model provides the LLC series resonant circuit of the high Switching Power Supply of a kind of power-efficient.
For solving technical problem of the present utility model, the utility model discloses a kind of LLC series resonant circuit of Switching Power Supply, it comprises draws together filter rectifier, pfc circuit, PFC control chip, sample circuit, LLC resonant circuit and LLC control chip, filter rectifier, pfc circuit, LLC resonant circuit connect successively, the PFC control chip is connected to pfc circuit, sample circuit keeps being connected with pfc circuit and PFC control chip respectively, the PFC control chip further is connected to the LLC control chip, and is provided with a comparator in the PFC control chip.
More excellent, described comparator keeps being connected with described sample circuit and described LLC control chip respectively.
Described sample circuit is made up of two resistance.
Compared with prior art, in the Switching Power Supply LLC series resonant circuit of the present utility model, in the PFC control chip, increase by a comparator, sampling voltage to pfc circuit is judged, realize unlatching thus to the LLC control chip, thereby omitted one group of sample circuit, simplified circuit, improved the reliability and the efficient of Switching Power Supply.
Description of drawings
Fig. 1 is the theory diagram of the Switching Power Supply LLC series resonant circuit of prior art.
Fig. 2 is the theory diagram of Switching Power Supply LLC series resonant circuit of the present utility model.
Fig. 3 is the part physical circuit figure of Switching Power Supply LLC series resonant circuit of the present utility model.
Embodiment
As shown in Figure 2, Switching Power Supply LLC series resonant circuit of the present utility model comprises filter rectifier, pfc circuit, PFC control chip, sample circuit, LLC resonant circuit and LLC control chip.Filter rectifier, pfc circuit, LLC resonant circuit connect successively.Filter rectifier is used for the interchange input is converted into direct current output.Pfc circuit is used to the LLC resonant circuit that PFC is provided voltage.The PFC control chip is connected to pfc circuit, and it is used for the output voltage of pfc circuit is controlled.Sample circuit keeps being connected with pfc circuit and PFC control chip respectively, it is used for the output voltage of pfc circuit is taken a sample, then sampling voltage is input to the PFC control chip, the PFC control chip is regulated the output voltage of pfc circuit according to sampling voltage.The LLC control chip is connected to the LLC circuit, and it is used to drive the work of LLC resonant circuit.The PFC control chip further is connected to the LLC control chip, is used to start the LLC control chip and enters mode of operation.
See also Fig. 3, in Switching Power Supply LLC series resonant circuit of the present utility model, the physical circuit figure of current rectifying and wave filtering circuit, pfc circuit, PFC chip for driving, sample circuit.Resistance R 2 and R3 form sample circuit, the utility model is provided with a comparator in the PFC control chip, this comparator is connected to sample circuit, be used for the sampling voltage of sample circuit is judged, when sampling voltage be higher than greater than a certain value (such as normal working voltage 90%) time, export a high level signal RDY, drive the LLC control chip and enter mode of operation.
Compared with prior art, in the Switching Power Supply LLC series resonant circuit of the present utility model, in the PFC control chip, increase by a comparator, sampling voltage to pfc circuit is judged, realize thus the unlatching to the LLC control chip, thereby omitted one group of sample circuit, simplified circuit, improved reliability and the efficient of Switching Power Supply.
Claims (3)
1. the LLC series resonant circuit of a Switching Power Supply, it comprises filter rectifier, pfc circuit, PFC control chip, sample circuit, LLC resonant circuit and LLC control chip, filter rectifier, pfc circuit, LLC resonant circuit connect successively, the PFC control chip is connected to pfc circuit, sample circuit keeps being connected with pfc circuit and PFC control chip respectively, it is characterized in that: the PFC control chip further is connected to the LLC control chip, and is provided with a comparator in the PFC control chip.
2. the LLC series resonant circuit of Switching Power Supply according to claim 1 is characterized in that, described comparator keeps being connected with described sample circuit and described LLC control chip respectively.
3. the LLC series resonant circuit of Switching Power Supply according to claim 1 is characterized in that, described sample circuit is made up of two resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202420955U CN201830154U (en) | 2010-06-28 | 2010-06-28 | Logic link control (LLC) series resonance circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202420955U CN201830154U (en) | 2010-06-28 | 2010-06-28 | Logic link control (LLC) series resonance circuit of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201830154U true CN201830154U (en) | 2011-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202420955U Expired - Fee Related CN201830154U (en) | 2010-06-28 | 2010-06-28 | Logic link control (LLC) series resonance circuit of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201830154U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054819A (en) * | 2017-11-20 | 2018-05-18 | 山东鲁能智能技术有限公司 | Minimize charging module, high frequency switch power and electronic equipment |
| CN109119021A (en) * | 2018-09-07 | 2019-01-01 | 深圳创维－Rgb电子有限公司 | A kind of OLED driving power and OLED TV |
| WO2021027675A1 (en) * | 2019-08-09 | 2021-02-18 | 海信视像科技股份有限公司 | Switching power supply device |
-
2010
- 2010-06-28 CN CN2010202420955U patent/CN201830154U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054819A (en) * | 2017-11-20 | 2018-05-18 | 山东鲁能智能技术有限公司 | Minimize charging module, high frequency switch power and electronic equipment |
| CN109119021A (en) * | 2018-09-07 | 2019-01-01 | 深圳创维－Rgb电子有限公司 | A kind of OLED driving power and OLED TV |
| WO2021027675A1 (en) * | 2019-08-09 | 2021-02-18 | 海信视像科技股份有限公司 | Switching power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20130628 |