CN104868716A - Boost converter - Google Patents
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- CN104868716A CN104868716A CN201410059116.2A CN201410059116A CN104868716A CN 104868716 A CN104868716 A CN 104868716A CN 201410059116 A CN201410059116 A CN 201410059116A CN 104868716 A CN104868716 A CN 104868716A
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Abstract
The invention discloses a boost converter which is capable of reducing the electric energy loss. The boost converter comprises a three-level boost circuit, a first switch device and a second switch device, wherein the first switch device is parallelly connected to two ends of a first diode in the three-level boost circuit, the on-state impedance of the first switch device is smaller than the on-state impedance of the first diode, the second switch device is parallelly connected to two ends of a second diode in the three-level boost circuit, and the on-state impedance of the second switch device is smaller than the on-state impedance of the second diode.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of booster converter.
Background technology
Tri-lever boosting circuit structure of the prior art as shown in Figure 1, specifically comprise the first inductance L 1 and the second inductance L 2 two inductance, the first switching tube Q1 and second switch pipe Q2 two switching tubes, the first diode D1 and the second diode D2 two diodes, the first electric capacity C1 and the second electric capacity C2 two electric capacity, wherein, one end of the first inductance L 1 is connected with the first end of the first switching tube Q1, the anode of the first diode D1; One end of second inductance L 2 is connected with the negative electrode of second end of second switch pipe Q2, the second diode D2; The other end of the first inductance L 1 and the other end of the second inductance L 2 are respectively as the positive and negative terminals of input power; The negative electrode of the first diode D1 is connected with the positive pole of the first electric capacity C1, and the link after being connected is as the positive terminals of out-put supply; The anode of the second diode D2 is connected with the negative pole of the second electric capacity C2, and the link after being connected is as the negative terminals of out-put supply; Second end of the first switching tube Q1 is connected with the first end of second switch pipe Q2; The negative pole of the first electric capacity C1 is connected with the positive pole of the second electric capacity C2; The tie point of two switching tube Q1 with Q2 is connected with the tie point of two electric capacity C1 with C2.In Fig. 1, electric capacity C0 is input filter capacitor, and R1 is load.
Wherein, the first switching tube Q1 and second switch pipe Q2 two switching tubes are specifically as follows metal-oxide-semiconductor, IGBT etc.When two switching tubes are specially metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is as the first end of switching tube, and the source electrode of metal-oxide-semiconductor is as the second end of switching tube, and the grid of metal-oxide-semiconductor is as the control end of switching tube; When two switching tubes are specially IGBT, the collector electrode of IGBT is as the first end of switching tube, and the emitter of IGBT is as the second end of switching tube, and the base stage of IGBT is as the control end of switching tube.
Tri-lever boosting circuit shown in Fig. 1 to the control end input PWM ripple of two switching tube Q1 and Q2, can turn off during conducting during control two switching tube Q1 and Q2, and then realizes the boosting to input voltage.But according to user's request, this tri-lever boosting circuit is also likely operated in the state of input voltage higher than output voltage, now two switching tube Q1 and Q2 continue to turn off, two diode D1 and D2 constant conduction.Under this operating state, two diode D1 and D2 constant conduction can consume certain electric energy, cause circuit efficiency to reduce.
Summary of the invention
The embodiment of the present invention provides a kind of booster converter, in order to reduce electric energy loss.
A kind of booster converter, comprising: tri-lever boosting circuit, the first switching device and second switch device, wherein:
Described first switching device is parallel to the two ends of the first diode in described tri-lever boosting circuit; The On-resistance of described first switching device is less than the On-resistance of described first diode;
Described second switch device is parallel to the two ends of the second diode in described tri-lever boosting circuit; The On-resistance of described second switch device is less than the On-resistance of described second diode.
Beneficial effect of the present invention comprises:
In the scheme that the embodiment of the present invention provides, on the basis of existing tri-lever boosting circuit, increase the two ends that two switching devices are parallel to two diodes in tri-lever boosting circuit respectively, when circuit working is in the state of input voltage higher than output voltage, control two switching devices and close, the On-resistance due to switching device is less than the On-resistance of diode, therefore, compared to prior art, can electric energy loss be reduced, improve circuit efficiency.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, is not construed as limiting the invention with the embodiment of the present invention one.In the accompanying drawings:
Fig. 1 is the schematic diagram of tri-lever boosting circuit in prior art;
The schematic diagram of the booster converter that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the booster converter that Fig. 3 provides for the employing embodiment of the present invention 1;
One of schematic diagram of the booster converter that Fig. 4 provides for the employing embodiment of the present invention 2;
The schematic diagram two of the booster converter that Fig. 5 provides for the employing embodiment of the present invention 2;
One of schematic diagram of the booster converter that Fig. 6 provides for the employing embodiment of the present invention 3;
The schematic diagram two of the booster converter that Fig. 7 provides for the employing embodiment of the present invention 3.
Embodiment
In order to provide the implementation reducing electric energy loss, embodiments provide a kind of booster converter, in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein, only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiments provide a kind of booster converter, as shown in Figure 2, comprise tri-lever boosting circuit, the first switching device S1 and second switch device S2, wherein:
First switching device S1 is parallel to the two ends of the first diode D1 in tri-lever boosting circuit; The On-resistance of the first switching device S1 is less than the On-resistance of the first diode D1;
Second switch device S2 is parallel to the two ends of the second diode D2 in tri-lever boosting circuit; The On-resistance of second switch device S2 is less than the On-resistance of the second diode D2.
In an embodiment of the present invention, arbitrary described switching device is specifically as follows relay switch; In an alternative embodiment of the invention, arbitrary described switching device also can be specifically contactless contactor.Relay switch and contactless contactor are only two examples, it is the switching device that two conventional On-resistances are less than diode On-resistance, be not intended to limit the present invention, other On-resistance is less than the switching device of diode On-resistance also can as the specific implementation of booster converter breaker in middle device provided by the invention.
When this booster converter works in the state of input voltage higher than output voltage, control the first switching device S1 and second switch device S2 two switching devices close, can electric energy loss be reduced, improve circuit efficiency.
Under normal circumstances, when this booster converter works in the state of input voltage higher than output voltage, in booster converter shown in Fig. 2, in tri-lever boosting circuit, the first switching tube Q1 and second switch pipe Q2 two switching tubes continue to turn off, and the first switching device S1 and second switch device S2 two switching devices close; When this booster converter does not work in the state of input voltage higher than output voltage, when namely working in pressure-increasning state, in booster converter shown in Fig. 2, turn off during conducting when the first switching tube Q1 and second switch pipe Q2 two switching tubes in tri-lever boosting circuit, the first switching device S1 and second switch device S2 two switching devices disconnect.
Namely there will not be the situation that switching tube conducting Simultaneous Switching device also closes under normal circumstances.But in case of a fault, then likely there is this situation, such as, when there is switching device contact adhesion fault.Now, there will be capacitance short-circuit electric discharge in circuit, when short circuit current is larger, may switching tube be damaged.
Therefore, preferably, current sensing device can be set in circuit, whether the size of current detected by current sensing device, walking direction circuit there is the failure condition that switching tube conducting Simultaneous Switching device is closed, controlling switching tube to turn off when being determined to be this failure condition, avoiding switching tube to damage.
In an embodiment of the present invention, current sensing device is specifically as follows shunt resistance; In an alternative embodiment of the invention, current sensing device also can be specifically current transformer.Shunt resistance summation current transformer is only two examples, and be two conventional current sensing device, be not intended to limit the present invention, other current sensing device also can as the specific implementation of current sensing device in booster converter provided by the invention.
Below in conjunction with accompanying drawing, the booster converter that the embodiment of the present invention provides is described in detail.
Embodiment 1:
Figure 3 shows that and comprise the booster converter that the embodiment of the present invention 1 provides: tri-lever boosting circuit, the first switching device S1, a second switch device S2 and current sensing device Rs, wherein:
First switching device S1 is parallel to the two ends of the first diode D1 in tri-lever boosting circuit; The On-resistance of the first switching device S1 is less than the On-resistance of the first diode D1;
Second switch device S2 is parallel to the two ends of the second diode D2 in tri-lever boosting circuit; The On-resistance of second switch device S2 is less than the On-resistance of the second diode D2;
In tri-lever boosting circuit, the tie point of two switching tube Q1 with Q2 is connected with the tie point of two electric capacity C1 with C2 in tri-lever boosting circuit by current sensing device Rs.
In order to further illustrate the booster converter that the embodiment of the present invention 1 provides, below its operation principle is set forth.
When this booster converter works in the state of input voltage higher than output voltage, first switching tube Q1 and second switch pipe Q2 two switching tubes continue to turn off, control the first switching device S1 and second switch device S2 two switching devices to close, input power DC, the first inductance L 1, first switching device S1, the first electric capacity C1, the second electric capacity C2, second switch device S2, the second inductance L 2 constitute a capacitor charging loop; Input power DC, the first inductance L 1, first switching device S1, load R1, second switch device S2, the second inductance L 2 constitute a load supplying loop simultaneously.
When this booster converter does not work in the state of input voltage higher than output voltage, when namely working in pressure-increasning state, turn off during conducting when the first switching tube Q1 and second switch pipe Q2 two switching tubes, control the first switching device S1 and second switch device S2 two switching devices disconnections, the same prior art of boosting principle.
When the electric current that current sensing device Rs detects is greater than predetermined current, when first switching tube Q1 and the Q2 conducting of second switch pipe are described, there is closed switching device in first switching device S1 and second switch device S2 two switching devices, now control two switching tubes and turn off.
In the embodiment of the present invention 1, the first switching device S1 and second switch device S2 two switching devices are specifically as follows relay switch, also can be contactless contactor; Current sensing device Rs is specifically as follows shunt resistance, also can be current transformer.
Visible, adopt the booster converter of the embodiment of the present invention 1, when this booster converter works in the state of input voltage higher than output voltage, electric energy loss can be reduced, improve circuit efficiency, and take into account the failure condition that switching tube conducting Simultaneous Switching device is closed, switching tube can be avoided damaged.
In above-described embodiment 1, current sensing device also can be positioned at other position, such as following embodiment 2.
Embodiment 2:
Figure 4 shows that and comprise the booster converter that the embodiment of the present invention 2 provides: tri-lever boosting circuit, the first switching device S1, second switch device S2, the first current sensing device Rs1 and the second current sensing device Rs2, wherein:
First switching device S1 is parallel to the two ends of the first diode D1 in tri-lever boosting circuit; The On-resistance of the first switching device S1 is less than the On-resistance of the first diode D1;
Second switch device S2 is parallel to the two ends of the second diode D2 in tri-lever boosting circuit; The On-resistance of second switch device S2 is less than the On-resistance of the second diode D2;
First switching tube Q1 the first switching tube branch road in series in first current sensing device Rs1 and tri-lever boosting circuit; The first end of the first switching tube branch road is connected with one end of the first inductance L 1 in tri-lever boosting circuit, the anode of the first diode D1;
Second switch pipe Q2 second switch pipe in series branch road in second current sensing device Rs2 and tri-lever boosting circuit; Second end of second switch pipe branch road is connected with one end of the second inductance L 2 in tri-lever boosting circuit, the negative electrode of the second diode D2;
Second end of the first switching tube branch road is connected with the first end of second switch pipe branch road; The tie point of two switching tube branch roads is connected with the tie point of two electric capacity C1 with C2 in tri-lever boosting circuit.
Wherein, the first end of the first switching tube branch road is specially one end corresponding to the first end of the first switching tube Q1 in this branch road, and the second end of the first switching tube branch road is specially one end corresponding to second end of the first switching tube Q1 in this branch road; The first end of second switch pipe branch road is specially one end corresponding to the first end of second switch pipe Q2 in this branch road, and the second end of second switch pipe branch road is specially one end corresponding to second end of second switch pipe Q2 in this branch road.
Such as, when two switching tubes are specially metal-oxide-semiconductor, the first end of switching tube branch road is specially one end of the drain electrode correspondence of metal-oxide-semiconductor, and the second end of switching tube branch road is specially one end corresponding to the source electrode of metal-oxide-semiconductor; When two switching tubes are specially IGBT, the first end of switching tube branch road is specially one end corresponding to the collector electrode of IGBT, and the second end of switching tube branch road is specially one end corresponding to the transmitter of IGBT.
In the embodiment of the present invention 2, the first switching device S1 and second switch device S2 two switching devices are specifically as follows relay switch, also can be contactless contactor; First current sensing device Rs1 and the second current sensing device Rs2 is specifically as follows shunt resistance, also can be current transformer.
Further, also can convert the particular location of the current sensing device in the booster converter shown in Fig. 4, as shown in Figure 5.
In order to further illustrate the booster converter that the embodiment of the present invention 2 provides, below its operation principle is set forth.
When this booster converter works in the state of input voltage higher than output voltage, the first switching tube Q1 and second switch pipe Q2 two switching tubes continue to turn off, and control the first switching device S1 and second switch device S2 two switching devices close; When this booster converter does not work in the state of input voltage higher than output voltage, when namely working in pressure-increasning state, turn off during conducting when the first switching tube Q1 and second switch pipe Q2 two switching tubes, control the first switching device S1 and second switch device S2 two switching devices disconnections.
When the electric current that the first current sensing device Rs1 detects is greater than predetermined current, illustrate that the first switching tube Q1 conducting simultaneously, first switching device S1 closes, and now can control the first switching tube Q1 and turn off, and also can control the first switching tube Q1 and second switch pipe Q2 two switching tubes together turn off; Equally, when the electric current that the second current sensing device Rs2 detects is greater than predetermined current, illustrate that second switch pipe Q2 conducting simultaneously, second switch device S2 closes, now can control second switch pipe Q2 to turn off, also can control the first switching tube Q1 and second switch pipe Q2 two switching tubes together turn off.To sum up, electric current that the arbitrary current sensing device in the first current sensing device Rs1 and the second current sensing device Rs2 two current sensing device detects can be worked as when being greater than predetermined current, control the first switching tube Q1 and second switch pipe Q2 two switching tubes turn off.
Visible, the booster converter that the embodiment of the present invention 2 provides, and the booster converter principle that above-described embodiment 1 provides is similar, also can reduce electric energy loss, improves circuit efficiency, avoids switching tube damaged.
Current sensing device also can be positioned at other position, judging whether to there occurs the closed failure condition of switching tube conducting Simultaneous Switching device, referring to following embodiment 3 by detecting the sense of current.
Embodiment 3:
Figure 6 shows that and comprise the booster converter that the embodiment of the present invention 3 provides: tri-lever boosting circuit, the first switching device S1, second switch device S2, the first current sensing device Rs1 and the second current sensing device Rs2, wherein:
First switching device S1 is parallel to the two ends of the first diode D1 in tri-lever boosting circuit; The On-resistance of the first switching device S1 is less than the On-resistance of the first diode D1;
Second switch device S2 is parallel to the two ends of the second diode D2 in tri-lever boosting circuit; The On-resistance of second switch device S2 is less than the On-resistance of the second diode D2;
After first switching device S1 and the first diode D1 parallel connection, and the first current sensing device Rs1 the first diode branch in series; The first end of the first diode branch is connected with one end of the first inductance L 1 in tri-lever boosting circuit, the first end of the first switching tube Q1; Second end of the first diode branch is connected with the positive pole of the first electric capacity C1 in tri-lever boosting circuit, and the link after being connected is as the positive terminals of out-put supply;
After second switch device S2 and the second diode D2 parallel connection, and the second current sensing device Rs2 the second diode branch in series; The first end of the second diode branch is connected with the negative electrode of the second electric capacity C2 in tri-lever boosting circuit, and the link after being connected is as the negative terminals of out-put supply; Second end of the second diode branch is connected with one end of the second inductance L 2 in tri-lever boosting circuit, second end of second switch pipe Q2.
Wherein, the first end of the first diode branch is specially one end corresponding to the anode of the first diode D1 in this branch road, and the second end of the first diode branch is specially one end corresponding to the negative electrode of the first diode D1 in this branch road; The first end of the second diode branch is specially one end corresponding to the anode of the second diode D2 in this branch road, and the second end of the second diode branch is specially one end corresponding to the negative electrode of the second diode D2 in this branch road.
In the embodiment of the present invention 3, the first switching device S1 and second switch device S2 two switching devices are specifically as follows relay switch, also can be contactless contactor; First current sensing device Rs1 and the second current sensing device Rs2 is specifically as follows shunt resistance, also can be current transformer.
Further, also can convert the particular location of the current sensing device in the booster converter shown in Fig. 6, as shown in Figure 7.
In order to further illustrate the booster converter that the embodiment of the present invention 3 provides, below its operation principle is set forth.
When this booster converter works in the state of input voltage higher than output voltage, the first switching tube Q1 and second switch pipe Q2 two switching tubes continue to turn off, and control the first switching device S1 and second switch device S2 two switching devices close; When this booster converter does not work in the state of input voltage higher than output voltage, when namely working in pressure-increasning state, turn off during conducting when the first switching tube Q1 and second switch pipe Q2 two switching tubes, control the first switching device S1 and second switch device S2 two switching devices disconnections.
Under normal operation, the first current sensing device Rs1 and the second current sensing device Rs2 two current sensing device all flow through forward current.
When the first current sensing device Rs1 detect flow through reverse current time, illustrate that the first switching tube Q1 conducting simultaneously, first switching device S1 closes, and now can control the first switching tube Q1 and turn off, and also can control the first switching tube Q1 and second switch pipe Q2 two switching tubes together turn off; Equally, when the second current sensing device Rs2 detect flow through reverse current time, illustrate that second switch pipe Q2 conducting is simultaneously, second switch device S2 closes, now can control second switch pipe Q2 to turn off, also can control the first switching tube Q1 and second switch pipe Q2 two switching tubes together turn off.To sum up, when the arbitrary current sensing device can worked as in the first current sensing device Rs1 and the second current sensing device Rs2 two current sensing device detects and flows through reverse current, control the first switching tube Q1 and second switch pipe Q2 two switching tubes shutoffs.
The booster converter that the embodiment of the present invention 3 provides, also can judge whether by the mode detecting size of current to there occurs the closed failure condition of switching tube conducting Simultaneous Switching device.Now detection control principle is identical with above-described embodiment 2, does not repeat them here.
Visible, the booster converter that the embodiment of the present invention 3 provides, compared to the booster converter that above-described embodiment 1 and embodiment 2 provide, also can reduce electric energy loss, avoid switching tube damaged, and whether there occurs the judgment mode of failure condition more simply directly by sense of current decision circuitry.
In sum, the scheme adopting the embodiment of the present invention to provide, can reduce electric energy loss, improves circuit efficiency.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a booster converter, is characterized in that, comprises tri-lever boosting circuit, the first switching device and second switch device, wherein:
Described first switching device is parallel to the two ends of the first diode in described tri-lever boosting circuit; The On-resistance of described first switching device is less than the On-resistance of described first diode;
Described second switch device is parallel to the two ends of the second diode in described tri-lever boosting circuit; The On-resistance of described second switch device is less than the On-resistance of described second diode.
2. booster converter as claimed in claim 1, it is characterized in that, also comprise a current sensing device, in described tri-lever boosting circuit, the tie point of two switching tubes is connected with the tie point of two electric capacity in described tri-lever boosting circuit by described current sensing device.
3. booster converter as claimed in claim 1, is characterized in that, also comprise the first current sensing device and the second current sensing device, wherein:
First switching tube the first switching tube branch road in series in described first current sensing device and described tri-lever boosting circuit; The first end of described first switching tube branch road is connected with one end of the first inductance, the anode of the first diode in described tri-lever boosting circuit;
Second switch pipe second switch pipe in series branch road in described second current sensing device and described tri-lever boosting circuit; Second end of described second switch pipe branch road is connected with one end of the second inductance, the negative electrode of the second diode in described tri-lever boosting circuit;
Second end of described first switching tube branch road is connected with the first end of described second switch pipe branch road; The tie point of two switching tube branch roads is connected with the tie point of two electric capacity in described tri-lever boosting circuit.
4. booster converter as claimed in claim 1, is characterized in that, also comprise the first current sensing device and the second current sensing device, wherein:
After described first switching device and described first diodes in parallel, and described first current sensing device the first diode branch in series; The first end of described first diode branch is connected with one end of the first inductance, the first end of the first switching tube in described tri-lever boosting circuit; Second end of described first diode branch is connected with the positive pole of the first electric capacity in described tri-lever boosting circuit, and the link after being connected is as the positive terminals of out-put supply;
After described second switch device and described second diodes in parallel, and described second current sensing device the second diode branch in series; The first end of described second diode branch is connected with the negative electrode of the second electric capacity in described tri-lever boosting circuit, and the link after being connected is as the negative terminals of out-put supply; Second end of described second diode branch is connected with one end of the second inductance, the second end of second switch pipe in described tri-lever boosting circuit.
5. the booster converter as described in as arbitrary in claim 1-4, is characterized in that, arbitrary described switching device is specially relay switch.
6. the booster converter as described in as arbitrary in claim 1-4, is characterized in that, arbitrary described switching device is specially contactless contactor.
7. the booster converter as described in as arbitrary in claim 2-4, is characterized in that, arbitrary described current sensing device is specially shunt resistance.
8. the booster converter as described in as arbitrary in claim 2-4, is characterized in that, arbitrary described current sensing device is specially current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059116.2A CN104868716A (en) | 2014-02-20 | 2014-02-20 | Boost converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059116.2A CN104868716A (en) | 2014-02-20 | 2014-02-20 | Boost converter |
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| CN104868716A true CN104868716A (en) | 2015-08-26 |
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| CN201410059116.2A Pending CN104868716A (en) | 2014-02-20 | 2014-02-20 | Boost converter |
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| CN106230253A (en) * | 2016-09-09 | 2016-12-14 | 华为技术有限公司 | Boost power translation circuit and control method |
| CN108702089A (en) * | 2016-02-24 | 2018-10-23 | 三菱电机株式会社 | Converter apparatus |
| CN110098730A (en) * | 2019-06-11 | 2019-08-06 | 阳光电源股份有限公司 | A kind of three-level Boost converter, control method and photovoltaic system |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park building B2 Applicant after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Applicant before: Aimosheng Network Energy Source Co., Ltd. |
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Application publication date: 20150826 |
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