CN113765370A - Switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit - Google Patents
Switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit Download PDFInfo
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- CN113765370A CN113765370A CN202111064647.7A CN202111064647A CN113765370A CN 113765370 A CN113765370 A CN 113765370A CN 202111064647 A CN202111064647 A CN 202111064647A CN 113765370 A CN113765370 A CN 113765370A
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
- H02M3/073—Charge pumps of the Schenkel-type
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Abstract
The invention relates to a parallel current sharing structure of switching tubes in a BUCK/BOOST half-bridge BOOST circuit, wherein the circuit is provided with a controller, an input positive terminal VBUS +, an input negative terminal VBUS-, an output positive terminal BAT +, an output negative terminal BAT-, an inductor L1, a capacitor C1 and switching tubes Q1-Q6, the switching tubes Q1-Q6 form an inversion structure and are bridged between VBUS + and VBUS-, the VBUS-is connected with BAT-, the controller synchronously controls the on-off of the switching tubes Q1-Q3 through a PWM output pin A, and synchronously controls the on-off of the switching tubes Q4-Q6 through a PWM output pin B; an electric lead line1 is led out from a junction J1 between the switching tube Q1 and the switching tube Q4, an electric lead line2 is led out from a junction J2 between the switching tube Q2 and the switching tube Q5, an electric lead line3 is led out from a junction J3 between the switching tube Q3 and the switching tube Q6, the electric lead line1, the electric lead line2 and the electric lead line3 are wound around the same magnetic ring in a parallel mode to form an inductor L1 and then are connected together to form a junction J4, and the junction J4 is connected to BAT through a capacitor C1 and is connected with BAT +.
Description
Technical Field
The invention relates to the field of direct current conversion, in particular to a switch tube parallel current sharing structure in a BUCK/BOOST half-bridge BUCK-BOOST circuit.
Background
The topological structure of parallel application of the switching tubes in the BUCK/BOOST half-bridge BUCK-BOOST circuit is shown in figure 1, 3 switching tubes Q1-Q3 are connected in parallel to form an upper bridge arm, and 3 switching tubes Q4-Q6 are connected in parallel to form a lower bridge arm, the structure is completely guaranteed for controlling the current sharing of the circuit by the consistency of the switching tubes, the rated current of the switching tubes is required to be higher than the upper limit, devices in the same batch are assembled and used, the requirement on the consistency of the devices is higher during application, and the parameters of the switching tubes are difficult to be truly the same in actual production, so that the real equal feeling is difficult to achieve, the switching tubes have the phenomenon of non-current sharing, the phenomenon of non-current sharing can be received in a small-power scene or a common application scene, but hidden dangers can be caused in a large-power scene or a high-requirement occasion.
Disclosure of Invention
The invention aims to solve the problem of low parallel current sharing coefficient when the consistency of the switching tubes is poor and achieve better current sharing effect.
In order to realize the purpose of the invention, a switch tube parallel current sharing structure in a BUCK/BOOST half-bridge BOOST circuit is provided, the BUCK/BOOST half-bridge BOOST circuit is provided with a controller, an input positive terminal VBUS +, an input negative terminal VBUS-, an output positive terminal BAT +, an output negative terminal BAT-, an inductor L1, a capacitor C1 and at least 6 switch tubes Q1-Q6 of the same kind, wherein the switch tube Q1 is connected with the switch tube Q4 in series, the switch tube Q2 is connected with the switch tube Q5 in series, the switch tube Q4 is connected with the switch tube Q6 in series, and three branches formed by the series connection are connected between the input positive terminal VBUS + and the input negative terminal VBUS-in parallel; the input negative terminal VBUS-is connected with the output negative terminal BAT-; the controller synchronously controls the on-off of the switching tubes Q1-Q3 through one PWM output pin A and synchronously controls the on-off of the switching tubes Q4-Q6 through the other PWM output pin B by taking the switching tubes Q1-Q3 as an upper bridge wall and taking the switching tubes Q4-Q6 as a lower bridge wall; the inductor is further provided with a magnetic ring, a conductive line1 is led out from a junction J1 between the switching tube Q1 and the switching tube Q4, a conductive line2 is led out from a junction J2 between the switching tube Q2 and the switching tube Q5, a conductive line3 is led out from a junction J3 between the switching tube Q3 and the switching tube Q6, and the conductive line1, the conductive line2 and the conductive line3 are wound around the same magnetic ring in a side-by-side mode to form the inductor L1 and then are connected together to form a junction J4; the junction J4 is connected to the output negative terminal BAT-via the capacitor C1, and is connected to the output positive terminal BAT +.
Wherein, the capacitor C1 comprises at least one electrolytic capacitor and at least one ceramic capacitor which are connected in parallel.
The capacitor C1 further includes a resistor R15 connected in parallel to the ceramic capacitor.
The input positive terminal VBUS + is sequentially connected with a resistor R4, a capacitor C2, a capacitor C3 and a resistor R6 in series and then connected to the input negative terminal VBUS-, the diode D1 is connected with a resistor R3 in series and then connected to two ends of a resistor R4 in parallel, the diode D2 is connected with a resistor R5 in series and then connected to two ends of a resistor R6 in parallel, the conducting directions of the diode D1 and the diode D2 are both directed to the input negative terminal VBUS-, and the joint between the capacitor C2 and the capacitor C3 is connected to the joint J1.
The G pole of each switching tube is connected with a resistor in series and is connected to a corresponding PWM output pin of the controller through the resistor; the PWM controller also comprises a resistor R12 and a resistor R13, the PWM output pin A is connected to a joint J1 through a resistor R12, and the PWM output pin B is connected to the input negative terminal VBUS-through a resistor R13.
The capacitor comprises a ceramic capacitor C12 connected in parallel with the resistor R12 and a ceramic capacitor C13 connected in parallel with the resistor R13.
The high-voltage direct current power supply further comprises a resistor R1, a resistor R2, an electrolytic capacitor C4 connected with the resistor R1 in parallel and an electrolytic capacitor C5 connected with the resistor R2 in parallel, the input positive terminal VBUS + is sequentially connected with the resistor R1 and the resistor R2 in series and then connected to the input negative terminal VBUS-, and a joint between the resistor R1 and the resistor R2 is connected to the ground.
The invention can ensure that the inductance of each group of tubes is completely equal under the synchronous on-off condition of the upper bridge wall switch tube Q1-Q3 and the synchronous on-off condition of the lower bridge wall switch tube Q4-Q6 through the mutual inductance action of three parallel conducting wires in the magnetic ring, because the voltage V is L di/dt during the work, the voltage of each tube is equal, the control time is also equal, under the equal inductance, the current flowing through each tube is also equal, the current equalization is realized, at the moment, one point difference of the conduction internal resistance of the switch tubes is almost 0 compared with the integral equivalent inductance, the influence is not generated, and the problem of low parallel current equalization coefficient when the consistency of the switch tubes is poor is solved.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description and other objects, features, and advantages of the present invention more comprehensible.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout the drawings.
In the drawings:
FIG. 1 illustrates a topology structure of parallel application of switching tubes in a BUCK/BOOST half-bridge BUCK-BOOST circuit in the prior art;
FIG. 2 shows a topology of the parallel application of the switching tubes in the BUCK/BOOST half-bridge BUCK-BOOST circuit of the present invention;
fig. 3 shows a schematic diagram of the inductive winding of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 2, the BUCK/BOOST half-bridge BOOST circuit of the present embodiment includes a controller, an input positive terminal VBUS +, an input negative terminal VBUS-, an output positive terminal BAT +, an output negative terminal BAT-, an inductor L1, a capacitor C1, and at least 6 switch tubes Q1-Q6 of the same kind, wherein the input negative terminal VBUS-is connected to the output negative terminal BAT-, the switch tube Q1 is connected in series to the switch tube Q4, the switch tube Q2 is connected in series to the switch tube Q5, the switch tube Q4 is connected in series to the switch tube Q6, and three branches formed by the series connection are connected in parallel and then bridged between the input positive terminal VBUS + and the input negative terminal VBUS-, so as to form a switch tube parallel current equalizing structure.
The switching tubes Q1-Q3 are used as upper bridge walls, the switching tubes Q4-Q6 are used as lower bridge walls, the controller synchronously controls the on-off of the switching tubes Q1-Q3 through one PWM output pin A, and synchronously controls the on-off of the switching tubes Q4-Q6 through the other PWM output pin B.
In order to realize current sharing, as shown in fig. 3, a magnetic ring is arranged in the circuit, a conductive line1 is led out from a junction J1 between a switching tube Q1 and a switching tube Q4, a conductive line2 is led out from a junction J2 between a switching tube Q2 and a switching tube Q5, a conductive line3 is led out from a junction J3 between a switching tube Q3 and a switching tube Q6, and then the conductive line1, the conductive line2 and the conductive line3 are arranged and wound around the same magnetic ring in a parallel mode to form the inductor L1 and are connected together to form a junction J4. The design of the structure can ensure that the inductance of each group of tubes is completely equal under the synchronous on-off condition of the upper bridge wall switching tubes Q1-Q3 and the synchronous on-off condition of the lower bridge wall switching tubes Q4-Q6 through the mutual inductance action of three parallel conducting wires in the magnetic ring, because the voltage V is L di/dt in work and the voltage of each tube is equal and the control time is also equal, under the equal inductance, the current flowing through each tube is also equal, the current sharing is realized, at the moment, one point difference of the conduction internal resistance of the switching tubes is almost 0 compared with the integral equivalent inductance, the influence can not be generated, and the problem of low parallel current sharing coefficient when the consistency of the switching tubes is poor is solved.
In the circuit, the junction J4 is connected to the output negative terminal BAT-through the capacitor C1 and connected to the output positive terminal BAT +, so as to form the output terminal of the circuit for DC output.
Further, the capacitor C1 is formed by at least one electrolytic capacitor and at least one ceramic capacitor in parallel connection, wherein the electrolytic capacitor is used for output filtering at medium and low frequencies, and the ceramic capacitor can attenuate burrs of an output waveform in cooperation with the electrolytic capacitor. Because the capacitor C1 is formed by connecting a plurality of capacitors in parallel, the energy storage capacity of the capacitor C1 is improved, and in order to avoid waveform distortion caused by high energy storage, the capacitor C1 is also provided with a resistor R15 which is connected in parallel with the ceramic capacitor to accelerate the capacity leakage.
In the BUCK/BOOST half-bridge BUCK-BOOST circuit of this embodiment, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, a diode D1, and a diode D2 are further provided to form an RCD symmetric absorption structure, when the RCD symmetric absorption structure is connected, an input positive terminal VBUS + is sequentially connected in series with the resistor R4, the capacitor C2, the capacitor C3, the resistor R6 and then connected to an input negative terminal VBUS-, a diode D1 is connected in series with the resistor R3 and then connected in parallel with two ends of the resistor R4, a diode D2 is connected in series with the resistor R5 and then connected in parallel with two ends of the resistor R6, and the conduction directions of the diode D1 and the diode D2 are both directed to the input negative terminal VBUS-, a connection point between the capacitor C2 and the capacitor C3 is connected to a connection point J1. With this structure, two advantages are achieved: (1) the junction J1 is made neutral, and the common mode is suppressed; (2) the problem that in the switching process of a device, line stray inductance can generate induced electromotive force and is absorbed through RCD is solved.
Furthermore, the G pole of each switching tube is connected with a resistor in series and is connected to the corresponding PWM output pin of the controller through the resistor, wherein the PWM output pin A of the controller is also connected to the junction J1 through the resistor R12, the PWM output pin B is also connected to the input negative terminal VBUS through the resistor R13, and in the case of an RCD symmetrical absorption structure, the PWM control signal level can be stabilized through the R12 and the R13, and reliable control is realized. Preferably, the resistor R12 is connected in parallel with the ceramic capacitor C12, and the resistor R13 is connected in parallel with the ceramic capacitor C13, so as to further remove the glitch of the PWM control signal.
In the embodiment, in order to perform medium and low frequency input filtering, the circuit further comprises a resistor R1, a resistor R2, an electrolytic capacitor C4 connected with the resistor R1 in parallel, and an electrolytic capacitor C5 connected with the resistor R2 in parallel, the input positive terminal VBUS + is connected with the resistor R1 and the resistor R2 in series in sequence and then connected to the input negative terminal VBUS-, and a connection point between the resistor R1 and the resistor R2 is connected to the ground.
The circuit of this embodiment realizes flow equalizing based on the theory of waiting to feel, can solve the problem that the parallelly connected coefficient of flow equalizing is low when the switch tube uniformity is not good, reaches better effect of flow equalizing.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Claims (7)
- A switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit,the BUCK/BOOST half-bridge BUCK-BOOST circuit comprises a controller, an input positive terminal VBUS +, an input negative terminal VBUS-, an output positive terminal BAT +, an output negative terminal BAT-, an inductor L1, a capacitor C1 and at least 6 switch tubes Q1-Q6 of the same kind,the switching tube Q1 is connected in series with the switching tube Q4, the switching tube Q2 is connected in series with the switching tube Q5, the switching tube Q4 is connected in series with the switching tube Q6, and three branches formed by the series connection are connected in parallel and then bridged between an input positive terminal VBUS + and an input negative terminal VBUS-;the input negative terminal VBUS-is connected with the output negative terminal BAT-;the controller synchronously controls the on-off of the switching tubes Q1-Q3 through one PWM output pin A and synchronously controls the on-off of the switching tubes Q4-Q6 through the other PWM output pin B by taking the switching tubes Q1-Q3 as an upper bridge wall and taking the switching tubes Q4-Q6 as a lower bridge wall;the method is characterized in that:the inductor is further provided with a magnetic ring, a conductive line1 is led out from a junction J1 between the switching tube Q1 and the switching tube Q4, a conductive line2 is led out from a junction J2 between the switching tube Q2 and the switching tube Q5, a conductive line3 is led out from a junction J3 between the switching tube Q3 and the switching tube Q6, and the conductive line1, the conductive line2 and the conductive line3 are wound around the same magnetic ring in a side-by-side mode to form the inductor L1 and then are connected together to form a junction J4;the junction J4 is connected to the output negative terminal BAT-via the capacitor C1, and is connected to the output positive terminal BAT +.
- 2. The parallel current sharing structure of the switch tubes according to claim 1, wherein: the capacitor C1 comprises at least one electrolytic capacitor and at least one ceramic capacitor connected in parallel.
- 3. The parallel current sharing structure of the switch tubes according to claim 2, wherein: the capacitor C1 further includes a resistor R15 connected in parallel with the ceramic capacitor.
- 4. The parallel current sharing structure of the switch tubes according to claim 1, wherein: the input positive terminal VBUS + is sequentially connected with a resistor R4, a capacitor C2, a capacitor C3 and a resistor R6 in series and then connected to the input negative terminal VBUS-, the diode D1 is connected with a resistor R3 in series and then connected to two ends of a resistor R4 in parallel, the diode D2 is connected with a resistor R5 in series and then connected to two ends of a resistor R6 in parallel, the conducting directions of a diode D1 and a diode D2 are both directed to the input negative terminal VBUS-, and the joint 1 between the capacitor C42 and the capacitor C3 is connected to the joint J599.
- 5. The parallel current sharing structure of the switch tubes according to claim 4, wherein:the G pole of each switching tube is connected in series with a resistor and is connected to a corresponding PWM output pin of the controller through the resistor;the PWM controller also comprises a resistor R12 and a resistor R13, the PWM output pin A is connected to a joint J1 through a resistor R12, and the PWM output pin B is connected to the input negative terminal VBUS-through a resistor R13.
- 6. The parallel current sharing structure of the switch tubes according to claim 5, wherein: the capacitor also comprises a ceramic capacitor C12 connected in parallel with the resistor R12 and a ceramic capacitor C13 connected in parallel with the resistor R13.
- 7. The parallel current sharing structure of the switch tubes according to claim 1, wherein: the high-voltage direct current power supply further comprises a resistor R1, a resistor R2, an electrolytic capacitor C4 connected with the resistor R1 in parallel and an electrolytic capacitor C5 connected with the resistor R2 in parallel, the input positive terminal VBUS + is sequentially connected with the resistor R1 and the resistor R2 in series and then connected to the input negative terminal VBUS-, and a joint between the resistor R1 and the resistor R2 is connected to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111064647.7A CN113765370A (en) | 2021-09-09 | 2021-09-09 | Switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111064647.7A CN113765370A (en) | 2021-09-09 | 2021-09-09 | Switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit |
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| Publication Number | Publication Date |
|---|---|
| CN113765370A true CN113765370A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111064647.7A Withdrawn CN113765370A (en) | 2021-09-09 | 2021-09-09 | Switch tube parallel current equalizing structure in BUCK/BOOST half-bridge BOOST circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106525A (en) * | 2023-04-13 | 2023-05-12 | 深圳市帝迈生物技术有限公司 | Blood analyzer |
-
2021
- 2021-09-09 CN CN202111064647.7A patent/CN113765370A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116106525A (en) * | 2023-04-13 | 2023-05-12 | 深圳市帝迈生物技术有限公司 | Blood analyzer |
| CN116106525B (en) * | 2023-04-13 | 2023-09-15 | 深圳市帝迈生物技术有限公司 | blood analyzer |
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Application publication date: 20211207 |
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