CN221784050U - A three-phase voltage passive boost circuit - Google Patents
A three-phase voltage passive boost circuit Download PDFInfo
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- CN221784050U CN221784050U CN202420261124.4U CN202420261124U CN221784050U CN 221784050 U CN221784050 U CN 221784050U CN 202420261124 U CN202420261124 U CN 202420261124U CN 221784050 U CN221784050 U CN 221784050U
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Abstract
本实用新型公开了软开关技术领域内的一种三相电压无源Boost电路，包括：续流电感L1另一端分别连接谐振电感L2的一端、二极管D2的正极、功率管S的漏极连接，谐振电感L2的另一端分别与续流二极管D1的正极、谐振电容C2的一端连接，二极管D2的负极分别与二极管D3的正极、谐振电容C1的一端连接，二极管D3的负极分别与谐振电容C2的另一端、二极管D4的正极连接，续流二极管D1的负极分别与二极管D4的负极、输出电容C5的一端、输出负载R的一端连接，谐振电容C1的另一端、输出电容C5的另一端、输出负载R的另一端分别与功率管S的源极连接。该Boost电路可使得功率管S达到实际的零电压开通和零电压关断，提高变换器的变换效率。
The utility model discloses a three-phase voltage passive Boost circuit in the field of soft switch technology, comprising: the other end of the freewheeling inductor L1 is respectively connected to one end of the resonant inductor L2, the positive electrode of the diode D2, and the drain of the power tube S; the other end of the resonant inductor L2 is respectively connected to the positive electrode of the freewheeling diode D1 and one end of the resonant capacitor C2; the negative electrode of the diode D2 is respectively connected to the positive electrode of the diode D3 and one end of the resonant capacitor C1; the negative electrode of the diode D3 is respectively connected to the other end of the resonant capacitor C2 and the positive electrode of the diode D4; the negative electrode of the freewheeling diode D1 is respectively connected to the negative electrode of the diode D4, one end of the output capacitor C5, and one end of the output load R; the other end of the resonant capacitor C1, the other end of the output capacitor C5, and the other end of the output load R are respectively connected to the source of the power tube S. The Boost circuit can make the power tube S achieve actual zero voltage turn-on and zero voltage turn-off, thereby improving the conversion efficiency of the converter.
Description
Technical Field
The utility model relates to the technical field of soft switches, in particular to a three-phase voltage passive Boost circuit.
Background
There are five challenges to switching power supplies, one of which is whether they can be more miniaturized. An important approach to miniaturizing switching power supplies is to increase the switching frequency. The high frequency energy greatly reduces the volume and weight of magnetic elements such as transformers and inductors, thereby improving the power density of the converter. But increasing the switching frequency increases the switching losses and makes the electromagnetic interference more severe. The soft switching technology can reduce switching loss, so that the switching power supply can realize high-frequency operation under the condition of low loss.
Implementations can be divided into active and passive soft switching techniques. The active soft switching technology is to add active devices (such as switches) on the original circuit, so that the cost is high, a control circuit is added to control the additional switches during operation, the circuit is complex, and the reliability is poor. In contrast, passive soft switching circuits are simple, highly reliable, and inexpensive. These advantages have made passive soft switching attractive in recent years.
For PWM converters, it is important that the passive soft switch can be turned on or off at zero voltage, directly affecting the conversion efficiency of the converter.
Disclosure of utility model
The application realizes zero-voltage on or off by providing the three-phase voltage passive Boost circuit, and improves the efficiency of the converter.
The embodiment of the application provides a three-phase voltage passive Boost circuit, which comprises the following components: the power tube S, the follow current inductor L1, the resonant inductor L2, the resonant capacitors C1 and C2, the output capacitor C5, the follow current diode D1, the diodes D2, D3 and D4 and the output load R;
One end of the follow current inductor L1 is connected with the positive end of the direct current power supply, the other end of the follow current inductor L1 is connected with one end of the resonant inductor L2, the positive electrode of the diode D2 and the drain electrode of the power tube S respectively, the other end of the resonant inductor L2 is connected with the positive electrode of the follow current diode D1 and one end of the resonant capacitor C2 respectively, the negative electrode of the diode D2 is connected with the positive electrode of the diode D3 and one end of the resonant capacitor C1 respectively, the negative electrode of the diode D3 is connected with the other end of the resonant capacitor C2 and the positive electrode of the diode D4 respectively, the negative electrode of the follow current diode D1 is connected with the negative electrode of the diode D4, one end of the output capacitor C5 and one end of the output load R respectively, the other end of the resonant capacitor C1, the other end of the output capacitor C5 and the other end of the output load R are connected with the source electrode of the power tube S respectively, and the source electrode of the power tube S is connected with the negative end of the direct current power supply.
The beneficial effects of the above embodiment are that: according to the Boost circuit, when the capacitor Cl resonates to 0V, the power tube S is turned off in a zero voltage state when the capacitor S is turned off, when the capacitor C2 resonates to 0V, the power tube S is turned on in a zero voltage state when the capacitor S is turned on, the power tube S can achieve actual zero voltage on and zero voltage off, and the conversion efficiency of the converter is improved. The external components of the converter are all passive components, the cost is low, the reliability is high, the loss is low, and only one control circuit is needed to control the main switch.
On the basis of the above embodiments, the present application can be further improved, and specifically, the following steps are provided:
In one embodiment of the present application, the three-phase voltage passive Boost circuit further includes diodes D5 and D6, one end of the freewheeling inductor L1 connected to the positive end of the dc power supply is further connected to the positive electrodes of the diodes D5 and D6, and the negative electrodes of the diodes D5 and D6 are further connected to the negative electrode of the freewheeling diode D1. D5 and D6 are protection diodes to prevent surge current from breaking down the power tube S.
In one embodiment of the present application, the three-phase voltage passive Boost circuit further includes capacitors C3 and C4, and a variable resistor PR1, wherein the other end of the freewheeling inductor L1 is further connected to one end of the capacitor C3, one end of the capacitor C4, and the other ends of the capacitors C3 and C4 are all connected to one end of the variable resistor PR1, and the other end of the variable resistor PR1 is connected to the source of the power tube S. C3, C4 and PR1 form RC loop, absorb the voltage spike when the power tube S is opened, improve the EMI of the circuit, reduce and turn off the loss.
In one embodiment of the present application, the power transistor S is an N-channel insulated gate field effect transistor. High withstand voltage, low on-resistance, and can provide higher efficiency and power density, and is suitable for high-frequency application.
In one embodiment of the present application, the diode in the Boost circuit is a fast recovery diode.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. The Boost circuit can enable the power tube S to achieve actual zero-voltage on and zero-voltage off, and improves the conversion efficiency of the converter.
2. The components of the Boost circuit are all passive components, and the Boost circuit is low in price, high in reliability and low in loss.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic circuit diagram of a three-phase voltage passive Boost circuit in an embodiment;
fig. 2 is a schematic circuit diagram of a three-phase rectifying circuit in an embodiment.
Detailed Description
The present utility model is further illustrated below in conjunction with the specific embodiments, it being understood that these embodiments are meant to be illustrative of the utility model only and not limiting the scope of the utility model, and that modifications of the utility model, which are equivalent to those skilled in the art to which the utility model pertains, will fall within the scope of the utility model as defined in the appended claims.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "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; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples of the utility model described and the features of the various embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The technical scheme in the embodiment of the application aims to solve the problems, and the overall thought is as follows:
Examples:
The embodiment of the application provides a three-phase voltage passive Boost circuit, wherein the input end of the Boost circuit is connected with the output end of a three-phase rectifying circuit and is used for carrying out Boost conversion on received direct current so as to output higher voltage signals;
As shown in fig. 1, the Boost circuit includes a power tube S, a freewheeling inductor L1, a resonant inductor L2, resonant capacitors C1 and C2, filter capacitors C3 and C4, an output capacitor C5, a freewheeling diode D1, diodes D2, D3, D4, D5, and D6, a variable resistor PR1, and an output load R.
One end of the follow current inductor L1 is connected with the positive end of the direct current power supply, the other end of the follow current inductor L2 is connected with one end of the resonant inductor L2, the positive electrode of the diode D2 and the drain electrode of the power tube S respectively, the other end of the resonant inductor L2 is connected with the positive electrode of the follow current diode D1 and one end of the resonant capacitor C2 respectively, the negative electrode of the diode D2 is connected with the positive electrode of the diode D3 and the positive electrode of the diode D4 respectively, the negative electrode of the follow current diode D1 is connected with the negative electrode of the diode D4, one end of the output capacitor C5 and one end of the output load R respectively, the other end of the resonant capacitor C1, the other end of the output capacitor C5 and the other end of the output load R are connected with the source electrode of the power tube S respectively, and the source electrode of the power tube S is connected with the negative end of the direct current power supply. L2 provides the main switch zero voltage on condition, limits diode D1's reverse recovery current, and electric capacity C1 provides the switch zero voltage off condition, and electric capacity C2 provides energy for inductance L2 energy recovery.
One end of the freewheeling inductor L1 connected with the positive end of the direct current power supply is also connected with the positive poles of the diodes D5 and D6 respectively, and the negative poles of the diodes D5 and D6 are also connected with the negative pole of the freewheeling diode D1 respectively. D5.d6 is a protection diode to prevent surge current from breaking down the power transistor S.
The other end of the follow current inductor L1 is also respectively connected with one end of a filter capacitor C3, one end of a filter capacitor C4 and the other ends of the filter capacitors C3 and C4, and is connected with one end of a variable resistor PR1, and the other end of the variable resistor PR1 is connected with a source electrode of a power tube S. C3, C4 and PR1 form RC loop, absorb the voltage spike when the power tube S is opened, improve the EMI of the circuit, reduce and turn off the loss.
As shown in fig. 2, the three-phase rectifying circuit includes capacitors C1', C2', C3', resistors R1', R2', R3', diodes D1', D2', D3', D4', D5', D6'. The input end of the three-phase rectifying circuit is connected with the output end of the circuit and is used for rectifying received three-phase electricity to output a direct current electric signal.
The Boost circuit works as follows:
t0: the power tube S is in an off state, where vc1=vo, vc2=0, il2=iin; vo is the input voltage and iin is the input current.
Stage t0 to t 1: from t0, the power transistor S is turned on and the current iL2 linearly decreases. At t=t1, the current iL2 decreases to zero and the diode D1 turns off.
Stage t 1-t 2: from t1, C1 starts to discharge through D3, C2, L2 and power tube S, vc2 rises from zero, and current iL2 increases from zero in the opposite direction. At t=t2, the C1 discharge process ends, vc1=0.
Stage t2 to t 3: since vc1=0, D2 is turned on, inductance L2 resonates with capacitance C2, and inductance current iL2 flows through D2 and D3, charging C2. The capacitance voltage Vc2 continues to rise. At t=t3, vc2 reaches a maximum value Vc2max and the inductor current iL2 drops to zero.
Stage t3 to t 4: starting from t3, vc2 remains at a maximum value of Vc2max, since il2=0, D2 and D3 are off. The converter operates in PWM state and il1=is. When t=t4, the power transistor S is turned off.
Stage t4 to t 5: starting from t4, as the power tube S is turned off, the power supply charges C1 along paths L1 and D2, and Vc1 rises from zero; the other path supplies power to the load through L1, L2, C2 and D4, meanwhile, the capacitor C2 discharges, vc2 falls, and iL2 rises. At t=t5, vc1 reaches Vo.
Stage t5 to t 6: starting from t5, vc1 is clamped at Vo, i.e. vc1max=vo; the power supply continues to supply power to the load via L1, L2, C2, D4, and the capacitor C2 continues to discharge. At t=t6, the capacitance voltage Vc2 drops to zero, while the inductor current iL2 rises to iin, il2=iin.
Stage t6 to t 7: from t6, the converter is restarted in PWM state. When t=t7, the power tube S is turned on, and the operation of the next cycle is started.
The technical scheme provided by the embodiment of the application at least has the following technical effects or advantages:
The three-phase voltage passive Boost circuit power tube S, the follow current inductor L1, the resonant inductor L2, the resonant capacitors C1 and C2, the follow current diode D1, the diodes D2, D3, D4, D5 and D6, and the power tube S are turned off, the follow current inductor L1 charges the resonant capacitor C1, the main power tube S1 is turned on, the follow current inductor L1 stops charging the resonant capacitor Cl, and the resonant inductor L2 and the resonant capacitors C1 and C2 are connected with a resonant channel. When the capacitor Cl resonates to 0V, the power tube S is turned off, and the power tube S is turned off in a zero-voltage state when the power tube S is turned off. When the capacitor C2 resonates to 0V, the power tube S is opened, and the power tube S is ensured to be in a zero-voltage state when the power tube S is opened. The power tube S can be enabled to achieve actual zero-voltage on and zero-voltage off, and the conversion efficiency of the converter is improved.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (5)
1. A three-phase voltage passive Boost circuit, comprising: the power tube S, the follow current inductor L1, the resonant inductor L2, the resonant capacitors C1 and C2, the output capacitor C5, the follow current diode D1, the diodes D2, D3 and D4 and the output load R;
One end of the follow current inductor L1 is connected with the positive end of the direct current power supply, the other end of the follow current inductor L1 is connected with one end of the resonant inductor L2, the positive electrode of the diode D2 and the drain electrode of the power tube S respectively, the other end of the resonant inductor L2 is connected with the positive electrode of the follow current diode D1 and one end of the resonant capacitor C2 respectively, the negative electrode of the diode D2 is connected with the positive electrode of the diode D3 and one end of the resonant capacitor C1 respectively, the negative electrode of the diode D3 is connected with the other end of the resonant capacitor C2 and the positive electrode of the diode D4 respectively, the negative electrode of the follow current diode D1 is connected with the negative electrode of the diode D4, one end of the output capacitor C5 and one end of the output load R respectively, the other end of the resonant capacitor C1, the other end of the output capacitor C5 and the other end of the output load R are connected with the source electrode of the power tube S respectively, and the source electrode of the power tube S is connected with the negative end of the direct current power supply.
2. The three-phase voltage passive Boost circuit of claim 1, wherein: the direct current power supply further comprises diodes D5 and D6, one end of the freewheeling inductor L1 connected with the positive end of the direct current power supply is further connected with the positive poles of the diodes D5 and D6 respectively, and the negative poles of the diodes D5 and D6 are further connected with the negative pole of the freewheeling diode D1 respectively.
3. The three-phase voltage passive Boost circuit of claim 2, wherein: the power tube further comprises capacitors C3 and C4 and a variable resistor PR1, wherein the other end of the follow current inductor L1 is further connected with one end of the capacitor C3, one end of the capacitor C4 and the other ends of the capacitors C3 and C4 respectively, the other ends of the capacitors C3 and C4 are connected with one end of the variable resistor PR1, and the other end of the variable resistor PR1 is connected with a source electrode of the power tube S.
4. The three-phase voltage passive Boost circuit of claim 1, wherein: and the power tube S is an N-channel insulated gate field effect transistor.
5. The three-phase voltage passive Boost circuit of claim 2, wherein: the freewheeling diode D1 and the diodes D2, D3, D4, D5, D6 are fast recovery diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420261124.4U CN221784050U (en) | 2024-02-02 | 2024-02-02 | A three-phase voltage passive boost circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420261124.4U CN221784050U (en) | 2024-02-02 | 2024-02-02 | A three-phase voltage passive boost circuit |
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| CN221784050U true CN221784050U (en) | 2024-09-27 |
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| CN202420261124.4U Active CN221784050U (en) | 2024-02-02 | 2024-02-02 | A three-phase voltage passive boost circuit |
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Address after: 225000 No. 19, Shugang West Road, Hangjiang District, Yangzhou City, Jiangsu Province Patentee after: Jiangsu Shenzhou Semiconductor Technology Co.,Ltd. Country or region after: China Address before: 225000 No. 19, Shugang West Road, Hangjiang District, Yangzhou City, Jiangsu Province Patentee before: JIANGSU SHENZHOU SEMI TECHNOLOGY Co.,Ltd. Country or region before: China |