CN211791269U - Step-up DC-DC converter - Google Patents
Step-up DC-DC converter Download PDFInfo
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- CN211791269U CN211791269U CN201821850673.6U CN201821850673U CN211791269U CN 211791269 U CN211791269 U CN 211791269U CN 201821850673 U CN201821850673 U CN 201821850673U CN 211791269 U CN211791269 U CN 211791269U
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- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
A boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a diode D2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a DC power supply Vi, the other end of the inductor L1 is simultaneously connected with the anode of the diode D1 and the port a of the electronic switch, the cathode of the diode D1 is simultaneously connected with one end of the capacitor C1 and one end of the inductor L2, the other end of the inductor L2 is simultaneously connected with one end of the capacitor Co and one end of a load Z, the port b of the electronic switch is simultaneously connected with the other end of the capacitor C1 and the anode of the diode D2, and the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the cathode of the diode D2 and the negative end. The utility model discloses has following operating characteristic: in the CCM mode, input current and output current are continuous, and output voltage is larger than or equal to direct-current power supply voltage and has the same polarity.
Description
Technical Field
The utility model relates to a direct current-direct current (DC-DC) converter, especially a type of stepping up DC-DC converter that input and output current are all continuous and input and output voltage homopolarity can construct the direct current electrical power generating system of many inputs and many outputs as basic unit, if: the system comprises a direct current power supply module parallel system, an LED array driving system, a distributed photovoltaic power generation system and the like.
Background
The existing basic DC-DC converter with the Boost function includes a Boost converter, a Buck-Boost converter, a Cuk converter, a Sepic converter and a Zeta converter. As listed in table 1, none of the 5 basic DC-DC converters with a boost function described above satisfies the requirement of "input and output currents are continuous and input and output voltages are of the same polarity" without considering the output capacitance.
Table 1.
Disclosure of Invention
In order to overcome the current basic DC-DC converter that has boost function and not to satisfy "input and output current all continuous and input and output voltage homopolarity" the requirement not enough, the utility model provides a boost type DC-DC converter can realize that input and output current are all continuous and input and output voltage homopolarity under the CCM mode, expands the kind of DC-DC converter.
The utility model provides a technical scheme that its technical problem adopted is:
a boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a diode D2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a DC power supply Vi, the other end of the inductor L1 is simultaneously connected with the anode of the diode D1 and the port a of the electronic switch, the cathode of the diode D1 is simultaneously connected with one end of the capacitor C1 and one end of the inductor L2, the other end of the inductor L2 is simultaneously connected with one end of the capacitor Co and one end of a load Z, the port b of the electronic switch is simultaneously connected with the other end of the capacitor C1 and the anode of the diode D2, and the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the cathode of the diode D2 and the negative end.
In the utility model, assume that boost type DC-DC converter is in CCM mode, when electronic switch cuts off, diode D1 switches on, and direct current power supply Vi, inductance L1, diode D1, electric capacity C1 and diode D2 constitute a return circuit, and direct current power supply Vi, inductance L1, diode D1, inductance L2, electric capacity Co and load Z constitute another return circuit; when the electronic switch is turned on, the diode D1 is turned off, the dc power source Vi, the inductor L1, the electronic switch and the diode D2 form a loop, and the dc power source Vi, the inductor L1, the electronic switch, the capacitor C1, the inductor L2, the capacitor Co and the load Z form another loop.
Further, the electronic switch adopts a unidirectional conductive electronic switch, that is, when the electronic switch is conductive, the current flows in from the port a and flows out from the port b. This preference is to prevent current backflow.
The boost DC-DC converter is assumed to be in DCM mode. When the electronic switch which is conducted in one direction is turned off and the diode D2 is conducted, the diode D1 is conducted, the direct-current power supply Vi, the inductor L1, the diode D1, the capacitor C1 and the diode D2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D1, the inductor L2, the capacitor Co and the load Z form another loop; when the electronic switch which is conducted in one direction is cut off and the diode D2 is cut off, the diode D1 is conducted, and the direct-current power supply Vi, the inductor L1, the diode D1, the inductor L2, the capacitor Co and the load Z form a loop until the diode D1 is also cut off; when the electronic switch is turned on, the diode D1 is turned off, the dc power source Vi, the inductor L1, the electronic switch and the diode D2 form a loop, and the dc power source Vi, the inductor L1, the electronic switch, the capacitor C1, the inductor L2, the capacitor Co and the load Z form another loop.
The electronic switch comprises a diode D3, an N-type MOS tube M1 and 1 controller, wherein the controller is provided with a port vg, the anode of the diode D3 is connected with the port a of the electronic switch, the cathode of the diode D3 is connected with the drain of the N-type MOS tube M1, the source of the N-type MOS tube M1 is connected with the port b of the electronic switch, and the gate of the N-type MOS tube M1 is connected with the port vg of the controller.
The controller determines the working state of the N-type MOS tube M1, and the controller adopts a power supply control chip.
The technical conception of the utility model is as follows: the diode D1, the diode D2 and the electronic switch are reasonably configured, so that the capacitor C1, the inductor L1 and the inductor L2 cooperatively store and release energy in one working period, high-efficiency boost conversion is realized, the polarity of output voltage is unchanged, and input and output currents are continuous in a CCM mode.
The beneficial effects of the utility model are that: the boost DC-DC converter has a simple circuit structure, and has the working characteristics of high efficiency, continuous input and output currents in a CCM mode, consistent output and input voltage polarities, and output voltage Vo greater than or equal to direct-current power supply voltage Vi.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a waveform diagram of the simulation operation in the CCM mode according to the embodiment of the present invention.
Fig. 3 is a waveform diagram of the simulation operation in DCM according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, a boost DC-DC converter includes an inductor L1, a diode D1, a capacitor C1, an inductor L2, a diode D2, a capacitor Co, and 1 electronic switch, where the electronic switch has a port a and a port b, one end of the inductor L1 is connected to the positive terminal of a DC power source Vi, the other end of the inductor L1 is connected to the anode of the diode D1 and the port a of the electronic switch, the cathode of the diode D1 is connected to one end of the capacitor C1 and one end of the inductor L2, the other end of the inductor L2 is connected to one end of the capacitor Co and one end of a load Z, the port b of the electronic switch is connected to the other end of the capacitor C1 and the anode of the diode D2, and the other end of the load Z is connected to the other end of the capacitor Co, the cathode of the diode D2 and the negative terminal of the DC power source.
Further, in order to prevent the reverse current, the electronic switch adopts a unidirectional conductive electronic switch, that is, the electronic switch flows in from the port a and flows out from the port b when conducting.
Still further, the electronic switch includes diode D3, N-type MOS transistor M1 and 1 controller, the controller has port vg, the anode of diode D3 is connected to port a of the electronic switch, the cathode of diode D3 is connected to the drain of N-type MOS transistor M1, the source of N-type MOS transistor M1 is connected to port b of the electronic switch, and the gate of N-type MOS transistor M1 is connected to port vg of the controller.
The controller determines the working state of the N-type MOS transistor M1, and the controller adopts a conventional power control chip, such as: UC3842 and the like.
When the embodiment is in the continuous conduction mode, i.e., CCM mode, L2 can be approximated as a constant current source, and the whole steady-state operation process includes the following 2 stages.
Stage 1: the N-type MOS transistor M1 is turned off, the diode D1 is turned on, the direct-current power supply Vi, the inductor L1, the diode D1, the capacitor C1 and the diode D2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D1, the inductor L2, the capacitor Co and the load Z form another loop. At this time, C1 was charged and L1 was discharged. Both the input current ii and the diode current iD2 drop linearly.
And (2) stage: the N-type MOS transistor M1 is turned on, the diode D1 is turned off, the diode D3 is turned on, the direct-current power supply Vi, the inductor L1, the diode D3, the N-type MOS transistor M1 and the diode D2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D3, the N-type MOS transistor M1, the capacitor C1, the inductor L2, the capacitor Co and the load Z form another loop. At this time, C1 was discharged and L1 was magnetized. Both the input current ii and the diode current iD2 rise linearly.
FIG. 2 is a diagram showing a simulation operating waveform in the CCM mode according to the embodiment. As can be seen from fig. 2, the input current ii of the embodiment is continuous, the output current io is continuous and has small ripple, and the output voltage Vo is larger than the dc power voltage Vi, and the output voltages Vo and Vi have the same polarity.
When the embodiment is in discontinuous conduction mode, i.e. DCM mode, the whole steady state operation process comprises the following 4 stages.
Stage 1: the N-type MOS transistor M1 is turned off, the diode D2 is turned on, the diode D1 is turned on, the direct-current power supply Vi, the inductor L1, the diode D1, the capacitor C1 and the diode D2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D1, the inductor L2, the capacitor Co and the load Z form another loop. At this time, C1 was charged, L1 was discharged, and L2 was charged. The input current ii decreases linearly and the output current io increases linearly.
And (2) stage: the N-type MOS transistor M1 is turned off, the diode D2 is turned off, the diode D1 is turned on, and the dc power supply Vi, the inductor L1, the diode D1, the inductor L2, the capacitor Co, and the load Z form a loop. At this time, the diode current iD2 is 0, and the input current ii is equal to the output current io, which decreases linearly.
And (3) stage: the N-type MOS transistor M1 is turned off, the diode D2 is turned off, and the diode D1 is turned off. At this time, the input current ii, the diode current iD2, and the output current io are all 0.
And (4) stage: the N-type MOS transistor M1 is turned on, the diode D1 is turned off, the diode D3 is turned on, the direct-current power supply Vi, the inductor L1, the diode D3, the N-type MOS transistor M1 and the diode D2 form a loop, and the direct-current power supply Vi, the inductor L1, the diode D3, the N-type MOS transistor M1, the capacitor C1, the inductor L2, the capacitor Co and the load Z form another loop. At this time, C1 was discharged, L1 was magnetized, and L2 was magnetized. Both the input current ii and the output current io rise linearly.
FIG. 3 is a waveform diagram of a simulation operation in DCM according to the embodiment. Fig. 3 shows that the output voltage Vo is greater than the dc power voltage Vi in 4 working phases of the embodiment, and the output voltages Vo and Vi have the same polarity.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.
Claims (4)
1. A step-up DC-DC converter, characterized in that: the boost DC-DC converter comprises an inductor L1, a diode D1, a capacitor C1, an inductor L2, a diode D2, a capacitor Co and 1 electronic switch, wherein the electronic switch is provided with a port a and a port b, one end of the inductor L1 is connected with the positive end of a DC power supply Vi, the other end of the inductor L1 is simultaneously connected with the anode of the diode D1 and the port a of the electronic switch, the cathode of the diode D1 is simultaneously connected with one end of a capacitor C1 and one end of the inductor L2, the other end of the inductor L2 is simultaneously connected with one end of the capacitor Co and one end of a load Z, the port b of the electronic switch is simultaneously connected with the other end of the capacitor C1 and the anode of the diode D2, and the other end of the load Z is simultaneously connected with the other end of the capacitor Co, the cathode of the diode D2 and the.
2. A step-up DC-DC converter as claimed in claim 1, wherein: the electronic switch adopts a unidirectional conductive electronic switch, namely, when the electronic switch is conductive, the current flows in from the port a and flows out from the port b.
3. A step-up DC-DC converter as claimed in claim 2, wherein: the electronic switch comprises a diode D3, an N-type MOS tube M1 and 1 controller, wherein the controller is provided with a port vg, the anode of the diode D3 is connected with the port a of the electronic switch, the cathode of the diode D3 is connected with the drain of the N-type MOS tube M1, the source of the N-type MOS tube M1 is connected with the port b of the electronic switch, and the gate of the N-type MOS tube M1 is connected with the port vg of the controller.
4. A step-up DC-DC converter as claimed in claim 3, wherein: the controller adopts a power supply control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821850673.6U CN211791269U (en) | 2018-11-12 | 2018-11-12 | Step-up DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821850673.6U CN211791269U (en) | 2018-11-12 | 2018-11-12 | Step-up DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211791269U true CN211791269U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821850673.6U Expired - Fee Related CN211791269U (en) | 2018-11-12 | 2018-11-12 | Step-up DC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211791269U (en) |
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2018
- 2018-11-12 CN CN201821850673.6U patent/CN211791269U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201027 |
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| CF01 | Termination of patent right due to non-payment of annual fee |