CN107863888B - Half-bridge LC resonance conversion circuit based on PWM control - Google Patents
Half-bridge LC resonance conversion circuit based on PWM control Download PDFInfo
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- CN107863888B CN107863888B CN201710594468.1A CN201710594468A CN107863888B CN 107863888 B CN107863888 B CN 107863888B CN 201710594468 A CN201710594468 A CN 201710594468A CN 107863888 B CN107863888 B CN 107863888B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 50
- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 230000001131 transforming effect Effects 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 description 6
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3385—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a half-bridge LC resonance conversion circuit based on PWM control, which comprises: an input power BT1 for supplying power to the entire circuit; the first main power tube Q1 and the second main power tube Q2 are used for forming a half-bridge circuit; the resonant inductor L1, the primary winding N1, the secondary winding N2 and the resonant capacitor C1 are used for forming an LC resonant circuit; the first clamping diode D1 and the second clamping diode D2 are used for clamping that the primary side voltage peak of the main power transformer is lower than the input power supply voltage; the first input filter capacitor C2 and the second input filter capacitor C3 are used for filtering input voltage; the primary power transformer T1 and primary windings N1 and secondary windings N2 and N3 are used for transforming; the first output rectifying diode D3, the second output rectifying diode D4 and the output filter capacitor C4 are used for forming a rectifying and filtering circuit. The invention realizes that the resonant inductance changes along with the input voltage and the load, and the resonant period follows the PWM on period.
Description
Technical Field
The invention belongs to the technical field of switching power supply application, and particularly relates to a half-bridge LC resonance conversion circuit based on PWM control.
Background
When the voltage of the input converter changes, the output voltage is stable, and when the switching frequency of the converter is fixed, the pulse width of the input half-bridge power tube also changes along with the change, and the condition that the power tube realizes zero-current switching on and zero-current switching off of ZCS is that the pulse width (on time) is equal to the LC resonance period of the power loop; the pulse width of the power tube changes and the LC parameter must also change.
Disclosure of Invention
Accordingly, a primary object of the present invention is to provide a half-bridge LC resonant conversion circuit based on PWM control.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a half-bridge LC resonance conversion circuit based on PWM control, which comprises:
an input power BT1 for supplying power to the entire circuit;
the first main power tube Q1 and the second main power tube Q2 are used for forming a half-bridge circuit;
the resonant inductor L1, the primary winding N1, the secondary winding N2 and the resonant capacitor C1 are used for forming an LC resonant circuit;
the first clamping diode D1 and the second clamping diode D2 are used for clamping that the primary side voltage peak of the main power transformer is lower than the input power supply voltage;
the first input filter capacitor C2 and the second input filter capacitor C3 are used for filtering input voltage;
the primary power transformer T1 and primary windings N1 and secondary windings N2 and N3 are used for transforming;
the first output rectifying diode D3, the second output rectifying diode D4 and the output filter capacitor C4 are used for forming a rectifying and filtering circuit.
In the above scheme, the positive and negative poles of the input power BT1 are respectively connected to the D pole of the first main power tube Q1 and the S pole of the second main power tube Q2; the anode and the cathode of the first input filter capacitor C2 and the second input filter capacitor C3 which are connected in series are respectively connected with the anode and the cathode of the input power supply BT 1; the midpoint of the half-bridge circuit is connected with a primary winding N1 of a resonant inductor L1 and a resonant capacitor C1 in series, then the primary winding N1 is connected to one end of a primary winding N1 of a main power transformer T1, one end of the primary winding N1 is also connected with the anode of a first clamping diode D1 and the cathode of a second clamping diode D2 at the same time, the cathode of the clamping diode D1 and the anode of the clamping diode D2 are respectively connected with the anode and the cathode of an input power supply, and the other end of the primary winding N1 of the main power transformer T1 is connected with the cathode of an input filter capacitor C2 and the anode of an input filter capacitor C3 at the same time; the secondary windings N2 and N3 of the main power transformer T1 are respectively connected to the anodes of the first output rectifying diode D3 and the second output rectifying diode D4, the cathodes of the first output rectifying diode D3 and the second output rectifying diode D4 are connected together and then connected to the secondary winding N2 of the series resonant inductor L1, and then connected to the anode of the output filter capacitor C4.
In the above scheme, the primary winding N1 of the resonant inductor L1 is connected in series with the resonant circuit, and the secondary winding N2 is connected in series with the rectifying circuit on the secondary side of the transformer T1. When the load is unchanged, the smaller the duty ratio of the power tube is, the peak current of the primary side and the secondary side is increased along with the increase of the input voltage. Since the peak current on the secondary side increases, the coupling of N1 and N2 decreases, and the inductance of N1 decreases, which results in an increase in the primary side resonant frequency and a decrease in the resonant period. The turns ratio of the primary side and the secondary side of the transformer is equal to the harmonic when the turns ratio of the primary side and the secondary side of the transformer is satisfied.
The turns ratio of the primary side and the secondary side of the vibrating inductor L1 can meet the requirement that the change of the pulse width of the power tube is equal to the change of the resonance period. Therefore, ZCS on and off of the power tube can still be realized when the input voltage changes.
In the above scheme, the turns ratio of the primary side secondary side winding of the transformer T1 is equal to the turns ratio of the primary side secondary side winding of the resonant inductor L1, so that ZCS can be implemented when the input voltage and the load change of the primary power tube and the secondary side rectifier diode are both changed.
Compared with the prior art, the invention has the beneficial effects that:
the invention skillfully utilizes the principle of mutual coupling electromagnetic induction of the inductance double windings, realizes that the resonance inductance changes along with the change of input voltage and load, thereby realizing that the resonance period follows the PWM on period, and realizing the ZCS on and off of the power tube and the rectifying tube in the whole course when the input voltage changes and the load changes, thereby greatly improving the efficiency and EMC performance of the power supply; the resonant inductor L changes along with the pulse width change of the power tube, so that the power tube can realize ZCS under different voltage loads.
Drawings
Fig. 1 is a circuit diagram of a half-bridge LC resonant conversion circuit based on PWM control according to an embodiment of the present invention; fig. 2 shows a first main power in a half-bridge LC resonant conversion circuit based on PWM control according to an embodiment of the present invention
Current-voltage waveforms of the rate tube Q1 and the second main power tube Q2.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention realizes ZCS of the power tube under different input voltages and loads by adopting the resonant inductor L to change along with the pulse width change of the power tube.
The embodiment of the invention provides a half-bridge LC resonance conversion circuit based on PWM control, as shown in figure 1, which comprises:
an input power BT1 for supplying power to the entire circuit;
the first main power tube Q1 and the second main power tube Q2 are used for forming a half-bridge circuit;
the resonant inductor L1, the primary winding N1, the secondary winding N2 and the resonant capacitor C1 are used for forming an LC resonant circuit;
the first clamping diode D1 and the second clamping diode D2 are used for clamping that the primary side voltage peak of the main power transformer is lower than the input power supply voltage;
the first input filter capacitor C2 and the second input filter capacitor C3 are used for filtering input voltage;
the primary power transformer T1 and primary windings N1 and secondary windings N2 and N3 are used for transforming;
the first output rectifying diode D3, the second output rectifying diode D4 and the output filter capacitor C4 are used for forming a rectifying and filtering circuit.
The positive electrode and the negative electrode of the input power supply BT1 are respectively connected to the D electrode of the first main power tube Q1 and the S electrode of the second main power tube Q2; the anode and the cathode of the first input filter capacitor C2 and the second input filter capacitor C3 which are connected in series are respectively connected with the anode and the cathode of the input power supply BT 1; the midpoint of the half-bridge circuit is connected with a primary winding N1 of a resonant inductor L1 and a resonant capacitor C1 in series, then the primary winding N1 is connected to one end of a primary winding N1 of a main power transformer T1, one end of the primary winding N1 is also connected with the anode of a first clamping diode D1 and the cathode of a second clamping diode D2 at the same time, the cathode of the clamping diode D1 and the anode of the second clamping diode D2 are respectively connected with the anode and the cathode of an input power supply, and the other end of the primary winding N1 of the main power transformer T1 is connected with the cathode of an input filter capacitor C2 and the anode of a filter capacitor C3 at the same time; the secondary windings N2 and N3 of the main power transformer T1 are respectively connected to the anodes of the first output rectifying diode D3 and the second output rectifying diode D4, the cathodes of the first output rectifying diode D3 and the second output rectifying diode D4 are connected together and then connected with the secondary winding N2 of the series resonant inductor L1, and then connected to the anode of the output filter capacitor C4.
The primary winding N1 of the resonant inductor L1 is connected in series with the resonant circuit, and the secondary winding N2 is connected in series with the rectifying circuit of the secondary side of the transformer T1. When the load is unchanged, the smaller the duty ratio of the power tube is, the peak current of the primary side and the secondary side is increased along with the increase of the input voltage. Since the peak current on the secondary side increases, the coupling of N1 and N2 decreases, and the inductance of N1 decreases, which results in an increase in the primary side resonant frequency and a decrease in the resonant period. When the turns ratio of the primary side and the secondary side of the transformer is equal to that of the primary side and the secondary side of the resonant inductor L1, the pulse width change of the power tube is equal to that of the resonant period. Therefore, ZCS on and off of the power tube can still be realized when the input voltage changes.
The turns ratio of the primary side secondary side winding of the transformer T1 is equal to that of the primary side secondary side winding of the resonant inductor L1, and the transformer T1 is used for realizing ZCS when the input voltage and the load of the primary power tube and the secondary side rectifier diode are changed.
The main power tube can enable the MOSFET to be an IGBT, a triode and the like. The rectifier diode may be a MOSFET, an IGBT, a triode, or the like.
The LC resonance period follows the PWM on period.
The primary side loop in the invention is not limited to a half-bridge structure, and is also suitable for a full-bridge structure, and the secondary side rectifying loop is not limited to full-wave rectification and is also suitable for full-bridge rectification. The secondary side of the resonant inductor is not limited to being connected in series before or after the rectifier tube or directly connected in series with the secondary side of the main transformer.
As shown in fig. 2, Q1UDS is a DS pole voltage waveform of the first main power tube Q1; q2UDS is the DS pole current waveform of the second main power tube Q2; q1IDS is the DS pole voltage waveform of the first main power tube Q1; q2IDS is the DS pole current waveform of the second main power tube Q2; it can be seen from fig. 2 that the present invention implements a full-course ZCS soft switch.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (2)
1. A half-bridge LC resonant conversion circuit based on PWM control, comprising:
an input power BT1 for supplying power to the entire circuit;
the first main power tube Q1 and the second main power tube Q2 are used for forming a half-bridge circuit;
the resonant inductor L1, the primary winding N1, the secondary winding N2 and the resonant capacitor C1 are used for forming an LC resonant circuit;
the first clamping diode D1 and the second clamping diode D2 are used for clamping that the primary side voltage peak of the main power transformer is lower than the input power supply voltage;
the first input filter capacitor C2 and the second input filter capacitor C3 are used for filtering input voltage;
the primary power transformer T1 and primary windings N1 and secondary windings N2 and N3 are used for transforming;
the first output rectifying diode D3, the second output rectifying diode D4 and the output filter capacitor C4 are used for forming a rectifying and filtering circuit;
the positive electrode and the negative electrode of the input power supply BT1 are respectively connected to the D electrode of the first main power tube Q1 and the S electrode of the second main power tube Q2; the anode and the cathode of the first input filter capacitor C2 and the second input filter capacitor C3 which are connected in series are respectively connected with the anode and the cathode of the input power supply BT 1; the midpoint of the half-bridge circuit is connected with a primary winding N1 of a resonant inductor L1 and a resonant capacitor C1 in series, then the primary winding N1 is connected to one end of a primary winding N1 of a main power transformer T1, one end of the primary winding N1 is also connected with the anode of a first clamping diode D1 and the cathode of a second clamping diode D2 at the same time, the cathode of the clamping diode D1 and the anode of the second clamping diode D2 are respectively connected with the anode and the cathode of an input power supply, and the other end of the primary winding N1 of the main power transformer T1 is connected with the cathode of an input filter capacitor C2 and the anode of a filter capacitor C3 at the same time; the secondary windings N2 and N3 of the main power transformer T1 are respectively connected to the anodes of the first output rectifying diode D3 and the second output rectifying diode D4, the cathodes of the first output rectifying diode D3 and the second output rectifying diode D4 are connected together and then connected to the secondary winding N2 of the series resonant inductor L1, and then connected to the anode of the output filter capacitor C4;
the primary winding N1 of the resonant inductor L1 is connected in series with the resonant circuit, and the secondary winding N2 is connected in series with the rectifying circuit of the secondary side of the transformer T1; when the load is unchanged, the smaller the duty ratio of the power tube is, the peak current of the primary side and the secondary side is increased along with the increase of the input voltage; as the peak current of the secondary side increases, the coupling of N1 and N2 reduces the inductance of N1, which leads to an increase in the primary side resonant frequency and a reduction in the resonant period; when the turns ratio of the primary side and the secondary side of the transformer is equal to that of the primary side and the secondary side of the resonant inductor L1, the pulse width change of the power tube is equal to the resonance period change; therefore, ZCS on and off of the power tube can still be realized when the input voltage changes.
2. The PWM control-based half-bridge LC resonant conversion circuit according to claim 1, wherein the turns ratio of the primary-side secondary winding of the transformer T1 is equal to the turns ratio of the primary-side secondary winding of the resonant inductor L1, for achieving ZCS when the input voltage and the load of the primary power tube and the secondary rectifying diode are varied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710594468.1A CN107863888B (en) | 2017-07-20 | 2017-07-20 | Half-bridge LC resonance conversion circuit based on PWM control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710594468.1A CN107863888B (en) | 2017-07-20 | 2017-07-20 | Half-bridge LC resonance conversion circuit based on PWM control |
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| Publication Number | Publication Date |
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| CN107863888A CN107863888A (en) | 2018-03-30 |
| CN107863888B true CN107863888B (en) | 2024-01-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204578376U (en) * | 2015-04-16 | 2015-08-19 | 陕西科技大学 | There is the LLC resonant converter of current-limiting function |
| CN106685231A (en) * | 2016-11-23 | 2017-05-17 | 南京航空航天大学 | Primary side clamping type soft switching full-bridge converter and asymmetrical control method therefor |
| CN106787757A (en) * | 2016-12-29 | 2017-05-31 | 天津大学 | A kind of CLTCL resonance DCs converter |
| CN207691687U (en) * | 2017-07-20 | 2018-08-03 | 西安华羿微电子股份有限公司 | A kind of half-bridge LC resonance translation circuit based on PWM controls |
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2017
- 2017-07-20 CN CN201710594468.1A patent/CN107863888B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204578376U (en) * | 2015-04-16 | 2015-08-19 | 陕西科技大学 | There is the LLC resonant converter of current-limiting function |
| CN106685231A (en) * | 2016-11-23 | 2017-05-17 | 南京航空航天大学 | Primary side clamping type soft switching full-bridge converter and asymmetrical control method therefor |
| CN106787757A (en) * | 2016-12-29 | 2017-05-31 | 天津大学 | A kind of CLTCL resonance DCs converter |
| CN207691687U (en) * | 2017-07-20 | 2018-08-03 | 西安华羿微电子股份有限公司 | A kind of half-bridge LC resonance translation circuit based on PWM controls |
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