CN217607706U - Synchronous rectification circuit based on secondary side current sampling and primary side driving signal combination - Google Patents
Synchronous rectification circuit based on secondary side current sampling and primary side driving signal combination Download PDFInfo
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- CN217607706U CN217607706U CN202221602209.1U CN202221602209U CN217607706U CN 217607706 U CN217607706 U CN 217607706U CN 202221602209 U CN202221602209 U CN 202221602209U CN 217607706 U CN217607706 U CN 217607706U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- 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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Abstract
The utility model discloses a synchronous rectifier circuit based on secondary side current sampling combines once side drive signal, including first driver, full-bridge inverter circuit, first resonant circuit, high frequency transformer, second resonant circuit, full-bridge rectifier circuit, second driver and amplifier circuit, first driver passes through full-bridge inverter circuit and connects first resonant circuit, first resonant circuit passes through high frequency transformer and connects second resonant circuit, second resonant circuit passes through full-bridge rectifier circuit and connects the second driver, the second driver is connected first driver respectively and is connected high frequency transformer through amplifier circuit. The utility model discloses beneficial effect: the utility model discloses to two-way CLLC resonant converter rectification loss's problem, the synchronous rectification strategy that provides based on secondary side current sampling combines side drive signal only needs two current sensor, and is owing resonance, resonance point and cross all can realize under three kinds of modals of resonance, simple structure, and the loss reduces.
Description
Technical Field
The utility model belongs to the technical field of two-way DC/DC converter's rectifier network technique and specifically relates to a synchronous rectification circuit based on secondary side current sampling combines side drive signal once.
Background
With the goal of carbon neutralization and carbon peak reaching, new energy and distributed power sources are rapidly developed continuously, energy storage elements increasingly have the dual characteristics of 'source' and 'charge', and power electronic equipment needs to realize the function of bidirectional flow. The bidirectional CLLC resonant converter is commonly used in a DC/DC conversion link due to the characteristics of small turn-off current and easy realization of soft switching, and a secondary side of the traditional CLLC resonant converter is not added with a driving signal and is rectified by a body diode, so that the rectification efficiency is low and the loss is large; and a synchronous rectification strategy is adopted, so that current is guided into the channel when the diode is in circulation, and the conduction loss is effectively reduced.
When the current type synchronous rectification scheme of the traditional LLC resonant converter is applied to the bidirectional CLLC resonant converter, because the rectification network of the bidirectional CLLC resonant converter is in a full-bridge structure and the drive signals of diagonal switching tubes of the bidirectional CLLC resonant converter are the same, the diagonal switching tubes in the rectification network share one set of synchronous rectification drive signals, 2 current mutual sensors are needed, however, the bidirectional CLLC resonant converter needs to run in the forward and reverse directions, 4 current sensors are needed in the whole converter, and 2 current sensors are needed on the primary side and the secondary side respectively; the bidirectional CLLC resonant converter adopts the traditional current mode synchronous rectification strategy, needs more current sensors, and causes the cost increase of the converter.
Therefore, it is necessary to provide a synchronous rectification circuit based on secondary side current sampling combined with a primary side driving signal for the above problem.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists among the above-mentioned prior art, the utility model aims to provide a be based on secondary side current sampling combines the synchronous rectifier circuit of once side drive signal to solve above-mentioned problem.
The utility model provides a synchronous rectifier circuit based on secondary side current sampling combines primary side drive signal, includes first driver, full-bridge inverter circuit, first resonant circuit, high frequency transformer, second resonant circuit, full-bridge rectifier circuit, second driver and amplifier circuit, first driver passes through full-bridge inverter circuit and connects first resonant circuit, first resonant circuit passes through high frequency transformer and connects second resonant circuit, second resonant circuit passes through full-bridge rectifier circuit and connects the second driver, the second driver is connected first driver respectively and is connected high frequency transformer through amplifier circuit.
Preferably, the full-bridge inverter circuit includes a first dc power supply, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, one end of the first switch tube, one end of the second switch tube, one end of the third switch tube and one end of the fourth switch tube are connected to two ends of the first dc power supply respectively, the first switch tube is connected to the second switch tube, and the third switch tube is connected to the fourth switch.
Preferably, the first resonant circuit comprises a first capacitor, a first inductor and an excitation inductor, and the first capacitor is connected with the first inductor through the excitation inductor.
Preferably, the second resonant circuit comprises a second capacitor and a second inductor, and the second capacitor is connected in parallel with the second inductor.
Preferably, the full-bridge rectification circuit comprises a second direct-current power supply, a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, two ends of the second direct-current power supply are respectively connected with one end of the fifth switching tube, one end of the sixth switching tube, one end of the seventh switching tube and one end of the eighth switching tube, the fifth switching tube is connected with the sixth switching tube, and the seventh switching tube is connected with the eighth switching tube.
Preferably, the amplifying circuit comprises a diode rectifier bridge, a resistor and an amplifier, the diode rectifier bridge is connected with the resistor in parallel, and two ends of the resistor are respectively connected with a non-inverting input end and an inverting input end of the amplifier.
Compared with the prior art, the utility model discloses beneficial effect: the utility model discloses to two-way CLLC resonant converter rectification loss's problem, the synchronous rectification strategy that provides based on secondary side current sampling combines side drive signal only needs two current sensor, and is owing resonance, resonance point and cross all can realize under three kinds of modals of resonance, simple structure, and the loss reduces.
Drawings
Fig. 1 is a block diagram of the bidirectional resonant converter to which the synchronous rectification strategy based on secondary side current sampling of the present invention is applied.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The embodiments of the invention will be described in detail hereinafter with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1, a synchronous rectification circuit based on secondary side current sampling combines primary side drive signal, including first driver, full-bridge inverter circuit, first resonant circuit, high frequency transformer, second resonant circuit, full-bridge rectifier circuit, second driver and amplifier circuit, first driver passes through full-bridge inverter circuit and connects first resonant circuit, first resonant circuit passes through high frequency transformer and connects second resonant circuit, second resonant circuit passes through full-bridge rectifier circuit and connects the second driver, the second driver connects first driver respectively and connects high frequency transformer through amplifier circuit.
Full-bridge inverter circuit includes first DC power supply V1, first switch tube Q1, second switch tube Q2, third switch tube Q3 and fourth switch tube Q4's one end is connected respectively at first DC power supply V1's both ends, first switch tube Q1 is connected with second switch tube Q2, third switch tube Q3 is connected with fourth switch tube Q4, first resonant circuit includes first electric capacity C1, first inductance L1 and excitation inductance Lm, first electric capacity C1 is connected with first inductance L1 through excitation inductance Lm.
The second resonant circuit comprises a second capacitor C2 and a second inductor L2, the second capacitor C2 is connected with the second inductor L2 in parallel, the full-bridge rectification circuit comprises a second direct-current power supply V2, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8, one ends of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 are respectively connected with two ends of the second direct-current power supply V2, the fifth switch tube Q5 is connected with the sixth switch tube Q6, and the seventh switch tube Q7 is connected with the eighth switch tube Q8.
The amplifying circuit comprises a diode rectifier bridge Q10, a resistor R1 and an amplifier Q9, wherein the diode rectifier bridge Q10 is connected with the resistor R1 in parallel, and two ends of the resistor R1 are respectively connected with a non-inverting input end and an inverting input end of the amplifier Q9.
Compared with the prior art, the utility model discloses beneficial effect: the utility model discloses to two-way CLLC resonant converter rectification loss's problem, the synchronous rectification strategy that provides based on secondary side current sampling combines side drive signal only needs two current sensor, and is owing resonance, resonance point and cross all can realize under three kinds of modals of resonance, simple structure, and the loss reduces.
In fig. 1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8 respectively form two full bridges, a turn ratio of a high-frequency transformer T is n:1, dit is a level signal for it _ sen zero-crossing detection. When the first switching tube Q1 and the fourth switching tube Q4 are switched on, the secondary side current is increased, it _ sen is greater than 0, dit is a high level signal, at the moment, the synchronous rectification driving signal is changed into a high level, and the fifth switching tube Q5 and the eighth switching tube Q8 are switched on; before the first switching tube Q1 and the fourth switching tube Q4 are turned off, the secondary side current has already dropped to zero, it _ sen =0, dit is a low level signal, at this time, the synchronous rectification driving signal changes to a low level, and the fifth switching tube Q5 and the eighth switching tube Q8 are turned off. The same applies to the sixth switching tube Q6 and the seventh switching tube Q7. It can be seen that the driving signal of the synchronous rectifier is the result of logical and of the secondary side current zero-crossing comparison waveform and the primary side driving signal.
The utility model discloses sample secondary side electric current, the rectification is after zero-cross comparison, with the first switch tube Q1 of once side, fourth switch tube Q4's drive waveform logic phase then obtains fifth switch tube Q5, eighth switch tube Q8's synchronous rectification drive signal, with the second switch tube Q2 of once side, third switch tube Q3's drive waveform logic phase then obtains sixth switch tube Q6, seventh switch tube Q7's synchronous rectification drive signal, under the lack-resonance mode, synchronous rectification drive signal can lead inversion network switch tube and turn-off in advance, but drive signal duration and secondary side electric current non-zero time unanimity, it all flows through the rectifier switch tube promptly to have guaranteed the secondary side electric current, do not have when opening or turn-off advance or delay. The resonance point keeps consistent with a synchronous rectification driving signal in an over-resonance mode and a driving signal of an inversion network switch tube, namely when a first switch tube Q1 and a fourth switch tube Q4 are switched on or off, a fifth switch tube Q5 and an eighth switch tube Q8 of the rectification switch tube are also switched on or off; similarly, the second switching tube Q2 and the third switching tube Q3 are also consistent with the fifth switching tube Q5 and the eighth switching tube Q8. However, in the resonant point mode, the synchronous rectification has delayed turn-on, in the over-resonant mode, the synchronous rectification has delayed turn-on and advanced turn-off, so that a part of current passes through the body diode, but the delayed or advanced time is in dead time, and the current is relatively small, so that the loss caused in the body diode is very low, and meanwhile, the proper turn-on delay or advanced turn-off can also avoid the interference of voltage oscillation peak of zero crossing point in actual sampling.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (6)
1. A synchronous rectification circuit based on secondary side current sampling and primary side driving signals is characterized in that: including first driver, full-bridge inverter circuit, first resonant circuit, high frequency transformer, second resonant circuit, full-bridge rectifier circuit, second driver and amplifier circuit, first driver passes through full-bridge inverter circuit and connects first resonant circuit, first resonant circuit passes through high frequency transformer and connects second resonant circuit, second resonant circuit passes through full-bridge rectifier circuit and connects the second driver, the second driver is connected first driver respectively and is connected high frequency transformer through amplifier circuit.
2. The synchronous rectification circuit based on secondary-side current sampling combined with a primary-side drive signal as claimed in claim 1, wherein: full-bridge inverter circuit includes first DC power supply (V1), first switch tube (Q1), second switch tube (Q2), third switch tube (Q3) and fourth switch tube (Q4), the one end of first switch tube (Q1), second switch tube (Q2), third switch tube (Q3) and fourth switch tube (Q4) is connected respectively at the both ends of first DC power supply (V1), first switch tube (Q1) is connected with second switch tube (Q2), third switch tube (Q3) is connected with fourth switch tube (Q4).
3. The synchronous rectification circuit based on secondary-side current sampling combined with a primary-side drive signal as claimed in claim 1, wherein: the first resonant circuit comprises a first capacitor (C1), a first inductor (L1) and an excitation inductor (Lm), wherein the first capacitor (C1) is connected with the first inductor (L1) through the excitation inductor (Lm).
4. The synchronous rectification circuit based on secondary-side current sampling combined with the primary-side drive signal as claimed in claim 1, wherein: the second resonant circuit comprises a second capacitor (C2) and a second inductor (L2), and the second capacitor (C2) is connected with the second inductor (L2) in parallel.
5. The synchronous rectification circuit based on secondary-side current sampling combined with a primary-side drive signal as claimed in claim 1, wherein: the full-bridge rectification circuit comprises a second direct-current power supply (V2), a fifth switch tube (Q5), a sixth switch tube (Q6), a seventh switch tube (Q7) and an eighth switch tube (Q8), one ends of the fifth switch tube (Q5), the sixth switch tube (Q6), the seventh switch tube (Q7) and the eighth switch tube (Q8) are respectively connected with two ends of the second direct-current power supply (V2), the fifth switch tube (Q5) is connected with the sixth switch tube (Q6), and the seventh switch tube (Q7) is connected with the eighth switch tube (Q8).
6. The synchronous rectification circuit based on secondary-side current sampling combined with a primary-side drive signal as claimed in claim 1, wherein: the amplifying circuit comprises a diode rectifier bridge (Q10), a resistor (R1) and an amplifier (Q9), the diode rectifier bridge (Q10) is connected with the resistor (R1) in parallel, and two ends of the resistor (R1) are respectively connected with the non-inverting input end and the inverting input end of the amplifier (Q9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221602209.1U CN217607706U (en) | 2022-06-24 | 2022-06-24 | Synchronous rectification circuit based on secondary side current sampling and primary side driving signal combination |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221602209.1U CN217607706U (en) | 2022-06-24 | 2022-06-24 | Synchronous rectification circuit based on secondary side current sampling and primary side driving signal combination |
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| CN217607706U true CN217607706U (en) | 2022-10-18 |
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| CN202221602209.1U Active CN217607706U (en) | 2022-06-24 | 2022-06-24 | Synchronous rectification circuit based on secondary side current sampling and primary side driving signal combination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117650703A (en) * | 2024-01-25 | 2024-03-05 | 西安图为电气技术有限公司 | Current sampling circuit |
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2022
- 2022-06-24 CN CN202221602209.1U patent/CN217607706U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117650703A (en) * | 2024-01-25 | 2024-03-05 | 西安图为电气技术有限公司 | Current sampling circuit |
| CN117650703B (en) * | 2024-01-25 | 2024-05-10 | 西安图为电气技术有限公司 | Current sampling circuit |
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