CN205430054U - Heterogeneous direct current - direct current converting circuit - Google Patents
Heterogeneous direct current - direct current converting circuit Download PDFInfo
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- CN205430054U CN205430054U CN201620207317.7U CN201620207317U CN205430054U CN 205430054 U CN205430054 U CN 205430054U CN 201620207317 U CN201620207317 U CN 201620207317U CN 205430054 U CN205430054 U CN 205430054U
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- 238000006243 chemical reaction Methods 0.000 claims description 26
- 238000004146 energy storage Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract 1
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Abstract
The utility model relates to a direct current DC power supply alternaties the field, especially relate to a heterogeneous direct current direct current converting circuit. Including a plurality of single -phase direct currents direct current converting circuit, every single -phase direct current the direct current converting circuit all include: an input and an output, a sampling circuit for electric current and/or voltage to the input are sampled, obtain a sampled signal, the 2nd sampling circuit is connected with the output for electric current and/or voltage to the output are sampled, obtain the 2nd sampled signal, control circuit is connected with a sampling circuit, the 2nd sampling circuit respectively for produce a control signal and the 2nd control signal according to a sampled signal and/or the 2nd sampled signal, the switching circuit is connected with input, output, control circuit respectively, can produce a superposed signal to with the signal superposition of superposed signal with output, and the switching circuit utilizes a control signal and the 2nd control signal to control the production of superposed signal.
Description
Technical Field
The utility model relates to a direct current-direct current power supply transform field especially relates to a heterogeneous direct current-direct current converting circuit.
Background
At present, most of existing direct current-direct current (DC-DC) converters are used for unidirectional voltage conversion, that is, the working mode is usually a boost mode or a buck mode, if switching between the boost and buck working modes is to be realized, two converters are usually required to realize, and when one converter works, the other converter is in an idle state, which wastes more electronic device resources.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, a multiphase dc-dc converter circuit is provided, which can realize two working modes of voltage boosting and voltage reducing by using one converter circuit.
The specific technical scheme is as follows:
a multiphase dc-dc conversion circuit comprising a plurality of single phase dc-dc conversion circuits, each of the single phase dc-dc conversion circuits comprising:
An input terminal and an output terminal;
the first sampling circuit is connected with the input end and is used for sampling the current and/or the voltage of the input end to obtain a first sampling signal;
the second sampling circuit is connected with the output end and is used for sampling the current and/or the voltage of the output end to obtain a second sampling signal;
the control circuit is respectively connected with the first sampling circuit and the second sampling circuit and used for generating a first control signal and a second control signal according to the first sampling signal and/or the second sampling signal;
the switching circuit is respectively connected with the input end, the output end and the control circuit and can generate a superposed signal so as to superpose the superposed signal with the signal output by the output end; and
the switching circuit controls generation of the superimposed signal using the first control signal and the second control signal.
Preferably, the control circuit includes:
the inverting terminal of the first comparison circuit is connected with a first standard signal for comparing the first sampling signal with the first standard signal to obtain the first control signal.
Preferably, the control circuit further includes:
and the in-phase end of the second comparison circuit is connected with a second sampling signal, and the inverting end of the second comparison circuit is connected with a second standard signal so as to compare the second sampling signal with the second standard signal to obtain the second control signal.
Preferably, the switching circuit includes:
a first transistor, wherein the base electrode is connected with the first control signal, and the collector electrode is connected with the input end;
and a base of the second transistor is connected with the second control signal, a collector of the second transistor is connected with an emitter of the first transistor, and the emitter of the second transistor is grounded.
Preferably, the switching circuit further includes:
and the energy storage inductor is respectively connected with the emitter of the first transistor, the collector of the second transistor and the output end.
Preferably, the switching circuit further includes:
and the first capacitor is respectively connected with the collector of the first transistor and the input end.
Preferably, the switching circuit further includes:
and the second capacitor is respectively connected with the energy storage inductor and the output end.
Preferably, the method further comprises the following steps:
a first feedback circuit couplable between the input and the output.
Preferably, the method further comprises the following steps:
a second feedback circuit couplable between the input and the output; wherein,
when the superposition signal is superposed with the signal output by the output end, the control circuit controls the first feedback circuit to be coupled with the input end and the output end, and disconnects the second feedback circuit from being coupled with the input end and the output end;
when the superposition signal is not superposed with the signal output by the output end, the control circuit controls the second feedback circuit to be coupled with the input end and the output end, and disconnects the first feedback circuit from being coupled with the input end and the output end.
The beneficial effects of the above technical scheme are:
according to the technical scheme, one circuit can be switched to work between the boosting working mode and the voltage reduction working mode through the direct current-direct current conversion circuit, an extra power supply and an electric device are not needed, and waste of resources is greatly avoided.
Drawings
Fig. 1 is a circuit diagram of an embodiment of a multiphase dc-dc converter circuit according to the present invention;
fig. 2 is a circuit connection diagram of an embodiment of the single-phase dc-dc conversion circuit of the present invention.
Detailed Description
In the following embodiments, the technical features may be combined with each other without conflict.
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the present embodiment provides a multiphase dc-dc conversion circuit including a plurality of single-phase dc-dc conversion circuits, as shown in fig. 2, each of the single-phase dc-dc conversion circuits includes:
an input terminal Vin and an output terminal Vout;
the first sampling circuit is connected with the input end Vin and used for sampling the current and/or voltage of the input end Vin to obtain a first sampling signal;
the second sampling circuit is connected with the output end Vout and used for sampling the current and/or voltage of the output end Vout to obtain a second sampling signal;
the control circuit is respectively connected with the first sampling circuit and the second sampling circuit and used for generating a first control signal and a second control signal according to the first sampling signal and/or the second sampling signal;
the switching circuit is respectively connected with the input end Vin, the output end Vout and the control circuit and can generate a superposed signal so as to superpose the superposed signal with the signal output by the output end; and
The switching circuit controls generation of the superimposed signal using the first control signal and the second control signal.
In a preferred embodiment of the present invention, the control circuit comprises:
the device comprises a first comparison circuit, a second comparison circuit and a control circuit, wherein one input end (a same-phase end or an inverting end) of the first comparison circuit is connected with a first sampling signal, and the other input end (the same-phase end or the inverting end) of the first comparison circuit is connected with a first standard signal and used for comparing the first sampling signal with the first standard signal to obtain a first control signal;
and one input end (the in-phase end or the inverting end) of the second comparison circuit is connected with a second sampling signal, and the other input end (the in-phase end or the inverting end) of the second comparison circuit is connected with a second standard signal so as to compare the second sampling signal with the second standard signal to obtain a second control signal.
In a preferred embodiment of the present invention, the switching circuit includes:
a first transistor Q1, the base of which is connected to the first control signal and the collector of which is connected to the input terminal Vin;
a base of the second transistor Q2 is connected with a second control signal, a collector of the second transistor Q2 is connected with an emitter of the first transistor Q1, and an emitter of the second transistor Q2 is grounded;
the energy storage inductor L is respectively connected with the emitter of the first transistor Q1, the collector of the second transistor Q2 and the output end Vout;
A first capacitor C1 connected to the collector of the first transistor Q1 and the input terminal Vin, respectively;
and the second capacitor C2 is connected with the energy storage inductor L and the output terminal Vout respectively.
The utility model discloses a preferred embodiment still includes:
a first feedback circuit capable of being coupled between the input terminal Vin and the output terminal Vout;
a second feedback circuit capable of being coupled between the input terminal Vin and the output terminal Vout; wherein,
when the superposed signal is superposed with the signal output by the output end Vout, the control circuit controls the first feedback circuit to be coupled with the input end Vin and the output end Vout, and disconnects the coupling of the second feedback circuit with the input end Vin and the output end Vout;
when the superposed signal is not superposed with the signal output by the output end Vout, the control circuit controls the second feedback circuit to be coupled with the input end Vin and the output end Vout, and disconnects the first feedback circuit from being coupled with the input end Vin and the output end Vout.
As shown in fig. 2, the dc-dc converter circuit in this embodiment can operate in two operating modes, i.e., a boost operating mode and a buck operating mode, first, the embodiment first describes the boost operating mode, the second sampling circuit samples a current or a voltage of the input terminal Vin to obtain a first sampling signal, the first comparison circuit compares the first sampling signal with a first standard signal to obtain a first control signal, and if the value of the first sampling signal is lower than the first standard signal, which indicates that the voltage or the current of the input terminal Vin is too low due to power supply to the load of the output terminal Vout, the dc-dc converter circuit in this embodiment needs to operate in the boost operating mode, i.e., the electric energy flows from the output terminal Vout to the input terminal Vin.
Further, in this embodiment, if the sampled first sampling signal is a voltage, the first sampling circuit may be a resistance voltage division sampling circuit, and the resistance voltage division sampling circuit is the prior art, which is not described herein again; the first sampling circuit of this embodiment may include a current transformer if the sampled first sampling signal is a current.
Further, the comparison circuit in this embodiment may be a comparator, and the working principle of the comparator is the prior art, which is not described in detail in this embodiment. If the comparator circuit is a comparator, the first control signal is a digital signal output by the comparator, i.e., a high level or a low level, and the first transistor Q1 and the second transistor Q2 are turned on and off according to the control of the digital signal.
As described above, when the boost operating mode is operated, the control circuit controls the first transistor Q1 to be turned on by using the second control signal, the second transistor Q2 is turned off, the input terminal Vin forms a closed loop to the output terminal Vout through the first transistor Q1 and the energy storage inductor L in sequence, the energy storage inductor L releases energy to the output terminal Vout, that is, the energy released by the energy storage inductor L is a superimposed signal, so as to raise the voltage output by the output terminal Vout, and at the same time, the capacitor C1 discharges.
On the contrary, when the dc-dc conversion circuit works in the step-down state, the second sampling circuit samples the current or voltage of the output terminal Vout to obtain a second sampling signal, the second comparison circuit compares the second sampling signal with a second standard signal to obtain a second control signal, and if the value of the second sampling signal is lower than the second standard signal, which indicates that the voltage or current of the output terminal Vout is too low, the dc-dc conversion circuit of this embodiment needs to work in the step-down mode, so that the electric energy flows from the input terminal Vin to the output terminal Vout.
Further, in this embodiment, if the sampled second sampling signal is a voltage, the second sampling circuit may be a resistance voltage division sampling circuit, and the resistance voltage division sampling circuit is the prior art, which is not described herein again; the second sampling circuit of this embodiment may include a current transformer if the sampled second sampling signal is a current.
Further, the comparison circuit in this embodiment may be a comparator, and the working principle of the comparator is the prior art, which is not described in detail in this embodiment. If the comparator circuit is a comparator, the second control signal is a digital signal output by the comparator, i.e., a high level or a low level, and the first transistor Q1 and the second transistor Q2 are turned on and off according to the control of the digital signal.
As described above, when the control circuit operates in the step-down mode, the control circuit controls the first transistor Q2 to be turned on by the second control signal, the second transistor Q1 is turned off, the energy storage inductor L stores energy, and the second capacitor C2, the energy storage inductor L1 and the second transistor Q2 form a closed loop.
In the above embodiment, the dc-dc converter circuit may further include a first feedback circuit and a second feedback circuit, where the first feedback circuit operates and the second feedback circuit stops operating when the dc-dc converter circuit operates in the boost operating mode, and conversely, when the dc-dc converter circuit operates in the buck operating mode, the second feedback circuit operates and the first feedback circuit stops operating, that is, the two feedback circuits respectively perform feedback from the output terminal Vout to the output terminal Vin in different operating modes.
In this embodiment, when the load of the output terminal Vout changes, the control circuit may adopt a flexible control strategy to control the states of the respective DC-DC converters, for example, when the multiphase DC-DC converter circuit works under a heavy load, the loads between phases are equally divided, and the phase angles between phases are adjusted according to the loads; when the multi-phase direct current-direct current conversion circuit works under light load, a plurality of phases work intermittently in an alternating mode, the phase angle between the phases is adjusted according to the load, and the other phases are in a standby state; when the multi-phase DC-DC conversion circuit works at extremely light load, one phase works intermittently, and the rest phase modules are in a standby state.
In summary, the above technical solution allocates the operating states of the phase units through a flexible control strategy. The topological structure of each phase adopts a bidirectional half-bridge structure, each feedback adopts voltage and current double-closed-loop digital PID control, and a flexible multiphase coordination working strategy is adopted, so that the multiphase DC-DC conversion circuit can be ensured to work in a high-efficiency stable state, the stress of components can be reduced due to multiphase design, the output ripple wave is reduced, the size of an output filter device can be reduced, power devices are dispersed, the heat dissipation design is facilitated, and the reliability of the circuit is improved.
While the specification concludes with claims and claims presenting exemplary embodiments of certain features of the embodiments, it is understood that other modifications may be made without departing from the spirit of the invention. While the above-described embodiments represent presently preferred embodiments, these are not intended as limitations.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. It is therefore intended that the appended claims be interpreted as covering all alterations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (9)
1. A multi-phase dc-dc conversion circuit comprising a plurality of single-phase dc-dc conversion circuits, each of the single-phase dc-dc conversion circuits comprising:
an input terminal and an output terminal;
the first sampling circuit is connected with the input end and is used for sampling the current and/or the voltage of the input end to obtain a first sampling signal;
the second sampling circuit is connected with the output end and is used for sampling the current and/or the voltage of the output end to obtain a second sampling signal;
the control circuit is respectively connected with the first sampling circuit and the second sampling circuit and used for generating a first control signal and a second control signal according to the first sampling signal and/or the second sampling signal;
the switching circuit is respectively connected with the input end, the output end and the control circuit and can generate a superposed signal so as to superpose the superposed signal with the signal output by the output end; and
the switching circuit controls generation of the superimposed signal using the first control signal and the second control signal.
2. The multiphase dc-dc conversion circuit of claim 1, wherein said control circuit comprises:
The inverting terminal of the first comparison circuit is connected with a first standard signal for comparing the first sampling signal with the first standard signal to obtain the first control signal.
3. The multiphase dc-dc conversion circuit of claim 2, wherein said control circuit further comprises:
and the in-phase end of the second comparison circuit is connected with a second sampling signal, and the inverting end of the second comparison circuit is connected with a second standard signal so as to compare the second sampling signal with the second standard signal to obtain the second control signal.
4. The multiphase dc-dc conversion circuit of claim 1, wherein said switching circuit comprises:
a first transistor, wherein the base electrode is connected with the first control signal, and the collector electrode is connected with the input end;
and a base of the second transistor is connected with the second control signal, a collector of the second transistor is connected with an emitter of the first transistor, and the emitter of the second transistor is grounded.
5. The multiphase dc-dc conversion circuit of claim 4, wherein said switching circuit further comprises:
And the energy storage inductor is respectively connected with the emitter of the first transistor, the collector of the second transistor and the output end.
6. The multiphase dc-dc conversion circuit of claim 5, wherein said switching circuit further comprises:
and the first capacitor is respectively connected with the collector of the first transistor and the input end.
7. The multiphase dc-dc conversion circuit of claim 6, wherein said switching circuit further comprises:
and the second capacitor is respectively connected with the energy storage inductor and the output end.
8. The multiphase dc-dc conversion circuit of claim 1, further comprising:
a first feedback circuit couplable between the input and the output.
9. The multiphase dc-dc conversion circuit of claim 8, further comprising:
a second feedback circuit couplable between the input and the output; when the superposition signal is superposed with the signal output by the output end, the control circuit controls the first feedback circuit to be coupled with the input end and the output end, and disconnects the second feedback circuit from being coupled with the input end and the output end;
When the superposition signal is not superposed with the signal output by the output end, the control circuit controls the second feedback circuit to be coupled with the input end and the output end, and disconnects the first feedback circuit from being coupled with the input end and the output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620207317.7U CN205430054U (en) | 2016-03-17 | 2016-03-17 | Heterogeneous direct current - direct current converting circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620207317.7U CN205430054U (en) | 2016-03-17 | 2016-03-17 | Heterogeneous direct current - direct current converting circuit |
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| CN205430054U true CN205430054U (en) | 2016-08-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586562A (en) * | 2017-09-29 | 2019-04-05 | 力智电子股份有限公司 | Multiphase DC is to DC controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586562A (en) * | 2017-09-29 | 2019-04-05 | 力智电子股份有限公司 | Multiphase DC is to DC controller |
| CN109586562B (en) * | 2017-09-29 | 2021-03-16 | 力智电子股份有限公司 | Multiphase DC-to-DC Controllers |
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