CN114825942B - Boost circuit and electronic device - Google Patents

Boost circuit and electronic device Download PDF

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Publication number
CN114825942B
CN114825942B CN202210717219.8A CN202210717219A CN114825942B CN 114825942 B CN114825942 B CN 114825942B CN 202210717219 A CN202210717219 A CN 202210717219A CN 114825942 B CN114825942 B CN 114825942B
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signal
circuit
output
power supply
output voltage
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CN114825942A (en
Inventor
刘志军
蔡斌
杨鎏瑞
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Suzhou Shidai Xin'an Energy Technology Co ltd
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Suzhou Shidai Xin'an Energy Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a booster circuit and an electronic device, wherein the booster circuit comprises a first signal input end, a second signal input end, an isolation converter and an output circuit, wherein the second signal input end and the first signal input end are connected with the positive pole and the negative pole of an external power supply in a matched manner and used for outputting a first power supply signal; the isolation converter is used for converting the first power supply signal to obtain a first output voltage signal; the output circuit is used for generating an output signal; the output circuit comprises a first output circuit and a second output circuit, the first output circuit and the second output circuit respectively obtain a second output voltage signal and a third output voltage signal, and the ratio of the voltage of the second output voltage signal to the voltage of the third output voltage signal is smaller than a preset ratio. Through the mode, the conversion efficiency can be improved.

Description

Boost circuit and electronic device
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a booster circuit and an electronic device.
Background
In a conventional photovoltaic power generation scheme, a dc boost circuit processes all output power generated by a photovoltaic panel through the dc boost circuit, and since an output voltage of the dc boost circuit is the same as an input voltage, the dc boost circuit has a large loss and a low efficiency, and a controllable boost circuit capable of reducing power loss is urgently needed.
Disclosure of Invention
The application provides a booster circuit and an electronic device to solve the technical problems of large loss and low efficiency of a direct current conversion circuit.
In order to solve the technical problem, the application adopts a technical scheme that: a boost circuit, comprising:
the first signal input end and the second signal input end are both connected with an external power supply and used for outputting a first power supply signal;
the isolation converter is used for processing the first power supply signal to obtain a first output voltage signal and comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is connected with the first signal input end, and the second input end is connected with the second signal input end;
an output circuit for generating an output signal;
wherein, output signal includes second output voltage signal and third output voltage signal, and output circuit includes:
the first output circuit is connected with the first output end and the second output end and used for processing the first output voltage signal to obtain a second output voltage signal;
the second output voltage circuit is connected with the second output end and the second signal input end and is used for processing the first power supply signal to obtain a third output voltage signal;
and the ratio of the voltage of the second output voltage signal to the voltage of the third output voltage signal is smaller than a preset ratio.
Furthermore, the boost circuit further comprises a first filter circuit, wherein the first filter circuit is connected with the first signal input end, the second signal input end and the isolation converter, and is used for filtering the first power supply signal to obtain a second power supply signal and inputting the second power supply signal to the isolation converter.
Furthermore, the first filter circuit comprises a first capacitor, a first end of the first capacitor is connected with the first signal input end and the first input end, and a second end of the first capacitor is connected with the second signal input end.
Further, the isolated converter further comprises:
the transformer is connected with the first filter circuit and used for generating a first boosting signal based on the second power supply signal;
and the rectifying circuit is connected with the transformer and is used for rectifying the second boosting signal to generate a first output voltage signal.
And the adjusting circuit is connected with the first filter circuit and used for processing the second power supply signal to obtain a second boosting signal and inputting the second boosting signal into the transformer.
Further, the boost circuit further comprises a first processing circuit, wherein the first processing circuit is connected with the rectifying circuit and is used for processing the signal output by the rectifying circuit to obtain a first output voltage signal.
Further, the boost circuit comprises a first switch circuit and a second processing circuit, wherein the first switch circuit is connected with the first filter circuit and is used for processing the second power supply signal to obtain a third boost signal; the second processing circuit is connected with the first switch circuit and used for filtering the third boosting signal to obtain a first boosting signal.
Further, the second filter circuit is connected with the first filter circuit and the transformer and is used for filtering the second power supply signal to obtain a third power supply signal;
and the second switch circuit is connected with the second filter circuit and the transformer and is used for conducting a path between the transformer and the second filter circuit so as to enable the third power supply signal to enter the transformer.
Further, the first output circuit comprises a second capacitor, and the second capacitor is connected in parallel with the rectifying circuit and is used for performing filtering and voltage stabilizing processing on the first output voltage signal to obtain a second output voltage signal.
The second output circuit comprises a third capacitor, and the third capacitor is connected in series with the second capacitor and used for filtering and stabilizing the first power supply signal to obtain a third output voltage signal.
Another technical scheme adopted by the application is as follows: an electronic device is provided, wherein the controller comprises the boost circuit in the technical scheme.
Furthermore, the electronic device further comprises a control chip, wherein the control chip is connected with the adjusting circuit in the boost circuit and used for generating a control signal and inputting the control signal into the adjusting circuit so as to adjust the voltage of the first boost signal output by the isolation converter.
The beneficial effect of this application is: the booster circuit comprises a first signal input end, a second signal input end, an isolation converter and an output circuit, wherein the second signal input end and the first signal input end are connected with the positive pole and the negative pole of an external power supply in a matched mode to output a first power supply signal; the isolation converter converts the first power supply signal to obtain a first output voltage signal; the output circuit comprises a first output circuit and a second output circuit, and the first output circuit is connected with the first output end and the second output end to obtain a second output voltage signal; the second output circuit is connected with the second output end and the second signal input end to obtain a third output voltage signal, the second output voltage signal and the third output voltage signal form an output signal, and the ratio of the voltage of the second output voltage signal to the voltage of the third output voltage signal is smaller than a preset ratio; because most of energy is directly output to the load without passing through the isolation converter, the efficiency of the input signals caused by passing through the isolation converter can be reduced, the occupation ratio of a third output voltage signal in the output signals is larger, the conversion efficiency of the circuit can be greatly improved, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic diagram of a conventional boost converter circuit;
FIG. 2 is a schematic diagram of an embodiment of a boost circuit of the present application;
FIG. 3 is a schematic diagram of another embodiment of a boost circuit of the present application;
FIG. 4 is a schematic structural diagram of an embodiment of an electronic device of the present application;
FIG. 5 is a circuit diagram of the full bridge LLC circuit selected for use in the isolated converter of the embodiment shown in FIG. 3;
FIG. 6 is a circuit diagram of an isolated half bridge LLC circuit selected for use in the isolated converter of the embodiment shown in FIG. 3;
FIG. 7 is a circuit diagram of an isolated full bridge circuit selected for use in the isolated converter of the embodiment shown in FIG. 3;
FIG. 8 is a circuit diagram of an embodiment of the isolated converter of FIG. 3 in the form of an isolated half-bridge circuit;
FIG. 9 is a circuit diagram of an embodiment of the isolated converter of FIG. 3 with an optional isolated push-pull circuit;
fig. 10 is a circuit diagram of an isolated flyback circuit for the isolated converter in the embodiment shown in fig. 3;
FIG. 11 is a circuit diagram of an optional isolated forward circuit for the isolated converter of the embodiment shown in FIG. 3;
FIG. 12 is a schematic diagram of a boost circuit according to yet another embodiment of the present application;
fig. 13 is a schematic structural diagram of another embodiment of an electronic device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional boost converter circuit, where the conventional boost converter circuit has a large loss and an output power Pout = Vout × Iout, where Vout is an output voltage and Iout is an output current; the power loss Ploss is a loss caused by Pout passing through the conventional power conversion circuit 4, and since the output voltage Vout cannot be changed because it is a fixed value, the larger the input power is, the larger the output current Iout is, resulting in the larger the power loss Ploss is, and the lower the conversion efficiency is.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a boost circuit according to an embodiment of the present disclosure, the boost circuit including: the circuit comprises a first signal input terminal 11, a second signal input terminal 12, an isolation converter 2 and an output circuit 3, wherein the isolation converter 2 comprises a first input terminal 21, a second input terminal 22, a first output terminal 23 and a second output terminal 24.
The first signal input terminal 11 and the second signal input terminal 12 are matched and connected to an external power source (not shown) for outputting a first power supply signal Vin. Specifically, the first signal input terminal 11 may be connected to the positive electrode of an external power source, and the second signal input terminal 12 may be connected to the external power source; alternatively, the first signal input terminal 11 is connected to the negative terminal of the external power source, and the second signal input terminal 12 is connected to the positive terminal of the external power source.
Furthermore, the first filter circuit 13 is connected in parallel between the first signal input terminal 11 and the second signal input terminal 12, and the first signal input terminal 11 and the second signal input terminal 12 are respectively connected to the first input terminal 21 and the second input terminal 22 of the isolation converter 2, the second signal input terminal 12 is directly connected to the second signal output terminal 34 of the output circuit 3, and the first output terminal 23 of the isolation converter 2 is connected to the first signal output terminal 33 of the output circuit 3. Specifically, a first output circuit 31 is connected in parallel between the first output terminal 23 and the second output terminal 24 of the isolated converter 2, and a second output circuit 32 is connected in parallel between the second output terminal 24 and the second signal input terminal 12.
In one embodiment, the external power source is a photovoltaic power source of a photovoltaic panel (not shown), and the first input terminal 21 is connected to the first signal input terminal 11 and can be connected to the positive electrode of the photovoltaic power source; the second input terminal 22 is connected to the second signal input terminal 12 and may be connected to a negative electrode of the photovoltaic power source, so as to input the first power supply signal Vin into the isolation converter 2, where the isolation converter 2 is configured to convert the first power supply signal Vin to obtain a first output voltage signal.
The output circuit 3 comprises a first output circuit 31, a second output circuit 32 and a first signal output terminal 33 and a second signal output terminal 34, the output circuit 3 is configured to generate an output signal, the output signal Vout comprises a second output voltage signal Vo1 and a third output voltage signal Vo2.
The first output circuit 31 is connected in parallel between the first output terminal 23 and the second output terminal 24, and the first output circuit 31 is configured to process the first output voltage signal to obtain a second output voltage signal Vo1.
The second output circuit 32 is connected in parallel between the second output terminal 24 and the second signal input terminal 12, the first output circuit 31 is configured to process the first power supply signal to obtain a third output voltage signal Vo2, and a ratio of a voltage of the second output voltage signal Vo1 to a voltage of the third output voltage signal Vo2 is smaller than a preset ratio.
In this embodiment, the output signal Vout is obtained by superimposing the second output voltage signal Vo1 and the third output voltage signal Vo2, and the ratio of the second output voltage signal Vo1 to the third output voltage signal Vo2 is controlled to be as small as possible, so that the ratio of the third output voltage signal Vo1 to the output signal Vout is as small as possible, and the power consumed by the isolation converter 2 is small.
Referring to fig. 2 and fig. 3, fig. 3 is a schematic diagram of an embodiment of a boost circuit provided in the present application, which is similar to the embodiment shown in fig. 2 except that: the booster circuit in this embodiment further includes a first filter circuit 13.
The first filter circuit 13 is connected to the first signal input terminal 11, the second signal input terminal 12 and the isolation converter 2, and the first filter circuit 13 is configured to filter the first power supply signal Vin to obtain a second power supply signal and input the second power supply signal to the isolation converter 2. Specifically, the first filter circuit 13 is connected in parallel between a first connection point (i.e., a connection point between the first signal input terminal 11 and the first input terminal 21) and a second connection point (i.e., a connection point between the second signal input terminal 12 and the second input terminal 22), and the first filter circuit 13 can perform signal filtering on the photovoltaic power supply.
In a specific embodiment, as shown in fig. 4, the first filter circuit 13 includes a first capacitor C1, and the first capacitor C1 is connected in parallel between the first signal input terminal 11 and the second signal input terminal 12, that is, a first end of the first capacitor C1 is connected to the first signal input terminal 11 and the first input terminal 21, a second end of the first capacitor C1 is connected to the second signal input terminal, and the first capacitor C1 is used for inputting a part of the input power of the external power source into the isolated converter 2.
Further, the first capacitor C1 may be configured to filter and stabilize the entire first power supply signal Vin to obtain a second power supply signal, where a first end of the first capacitor C1 may be a positive electrode, and a second end of the first capacitor C1 may be a negative electrode. The first capacitor C1 is also connected to the isolated converter 2, and mainly inputs the filtered first power supply signal Vin to the isolated converter 2.
With continued reference to fig. 2, the isolated converter 2 further includes a regulating circuit 25, a transformer 26 and a rectifying circuit 27, which are connected in sequence, to perform a boost rectifying conversion on the first power supply signal Vin.
The adjusting circuit 25 is connected to the first filter circuit 13, and the adjusting circuit 25 is configured to process the second power supply signal to obtain a second boost signal, and input the second boost signal to the transformer 26.
The transformer 26 is connected to the first filter circuit 13, and the transformer 26 is configured to generate a first boost signal based on the second supply signal.
The rectifying circuit 27 is connected to the transformer 26, and the rectifying circuit 27 is configured to perform a rectifying process on the first boost signal to generate a first output voltage signal; specifically, the rectifying circuit 27 may rectify the ac signal into a dc signal, that is, the first boost signal is an ac signal, and the first output voltage signal is a dc signal.
Specifically, the first power supply signal Vin is processed by the first capacitor C1 to generate a second power supply signal, the second power supply signal is processed by the adjusting circuit 25 to obtain a second boosted signal, the second boosted signal is boosted by the transformer 26 to obtain a first boosted signal, and the first boosted signal is rectified by the rectifying circuit 27 to generate a first output voltage signal.
In a specific embodiment, as shown in fig. 3, the first output circuit 31 includes a second capacitor C3, the second capacitor C3 is connected in parallel between the output ends of the rectifying circuit 27 and is connected to the first signal output end 33, and the second capacitor C3 is used for performing filtering and voltage stabilizing processing on the first output voltage signal to obtain a second output voltage signal Vo1.
The second output circuit 32 includes a third capacitor C4, the third capacitor C4 is connected in series with the second capacitor C3, one end of the third capacitor C4 is connected to the second output terminal 24, the other end of the third capacitor C4 is connected to the second signal output terminal 34, and the third capacitor C4 is configured to perform filtering and voltage stabilizing processing on the first power supply signal Vin to obtain a third output voltage signal Vo2. The second output voltage signal Vo1 and the third output voltage signal Vo2 are superposed and output to obtain the output signal Vout.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of an electronic device of the present application, in which the electronic device 5 includes a boost circuit (not shown) and a control chip 51 in the above-mentioned scheme, and the control chip 51 is configured to generate a control signal and input the control signal to the adjusting circuit 25 to adjust a voltage of the first boost signal. Specifically, there are many control chips with control functions, which can be selected according to actual needs in the prior art.
Further, the electronic device 5 may further be provided with a photovoltaic power source (not shown), which is used for providing the first power supply signal Vin to the voltage boosting circuit of the present application.
The present embodiment provides a specific structure of the isolated converter 2, which will be described in detail below.
In a specific embodiment, as shown in fig. 5-6, fig. 5 is a circuit diagram of the embodiment shown in fig. 3, in which the full-bridge LLC circuit is selected for the isolated converter, i.e. the full-bridge LLC circuit is selected for the isolated converter 2 in the scheme shown in fig. 5. Fig. 6 is a circuit diagram of an isolated half-bridge LLC circuit selected for use in the isolated converter of the embodiment shown in fig. 3, and in the arrangement shown in fig. 6, a half-bridge LLC circuit is selected for use in the isolated converter 2.
As shown in fig. 5, the voltage boost circuit includes a first switch circuit 251 and a second processing circuit 252, where the first switch circuit 251 is connected to the first filter circuit 13, and is configured to process the second power supply signal to obtain a third boosted voltage signal; the second processing circuit 252 is connected to the first switch circuit, and the isolation converter 2 is configured to perform filtering processing on the third boost signal to obtain a first boost signal.
The first switch circuit 251 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4, the first transistor Q1 is connected in series with the second transistor Q2, and the third transistor Q3 is connected in series with the fourth transistor Q4; the third connection point (i.e., the connection point between the first transistor Q1 and the third transistor Q3) and the fourth connection point (i.e., the connection point between the second transistor Q2 and the fourth transistor Q4) are respectively connected to the first input terminal 21 and the second input terminal 22, and the second voltage signal is input to the first switch circuit 251 to be converted, so as to obtain a second boosted voltage signal.
The second processing circuit 252 includes a first filter capacitor C2 and a first filter inductor L1 connected in series to two ends of the transformer 26, the first filter capacitor C2 is connected to a connection point of the first transistor Q1 and the second transistor Q2, and the first filter inductor L1 is connected to a connection point of the third transistor Q3 and the fourth transistor Q4; through the cooperation of the first filter capacitor C2 and the first filter inductor L1, the second boost signal is filtered, so that the stability of the voltage input transformer 26 of the second boost signal is ensured.
In this embodiment, the control chip 51 may be a main control chip, the main control chip is connected to the control ends of the transistors Q1 to Q4, and the main control chip may control the on/off of the first transistor Q1 to the fourth transistor Q4, so as to control the voltage of the first boost signal in the adjustment circuit 25.
The first switch circuit 251 can receive the control signal output by the main control chip, and the main control chip can control the on-off frequency of the first transistor Q1, the second transistor Q2, the third transistor Q3 and the fourth transistor Q4, so as to control the magnitude of the first boosting signal, and thus, the magnitude of the second boosting signal and the first output voltage signal can be controlled.
In this embodiment, the rectifying circuit 27 includes a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3, and a fourth rectifying diode D4, the third connection point (i.e., the connection point of the first rectifying diode D1 and the third rectifying diode D3) and the fourth connection point (i.e., the connection point of the second rectifying diode D2 and the fourth rectifying diode D4) are respectively connected to the first output terminal 23 and the second output terminal 24, and the fifth connection point (i.e., the connection point of the first rectifying diode D1 and the second rectifying diode D2) and the sixth connection point (i.e., the connection point of the third rectifying diode D3 and the fourth rectifying diode D4) are respectively connected to the secondary side terminal of the transformer 26, so that the boosted first boost signal can be rectified into a direct current signal, and the first power supply signal can be converted from alternating current to direct current.
The operating principle of the isolated converter 2 is as follows: for the primary side positive half-cycle circulation loop of the transformer 26, the first transistor Q1 and the fourth transistor Q4 are simultaneously turned on, the first power supply signal Vin transfers energy to the secondary side of the transformer 26 through the first transistor Q1, the first filter inductor L1, the primary side of the transformer, the first filter capacitor C2 and the fourth transistor Q4, and the secondary side of the transformer 26 transfers energy to the output terminal Vo1 through the second rectifier diode D2 and the third rectifier diode D3. For the primary side negative half shaft circulation loop of the transformer 26, the second transistor Q2 and the third transistor Q3 are turned on simultaneously, the first power supply signal Vin transfers energy to the secondary side of the transformer 26 through the third transistor Q3, the first filter capacitor C2, the primary side of the transformer 26, the first filter inductor L1 and the second transistor Q2, and the secondary side of the transformer 26 transfers energy to the first output terminal 23 and the second output terminal 24 through the first rectifier diode D1 and the fourth rectifier diode D4.
The first output circuit 31 includes a second capacitor C3, which is used for performing filtering and voltage stabilizing processing on the first output voltage signal to obtain a second output voltage signal Vo1; this design may transfer a portion of the energy boost conversion to the first output circuit 31.
The second output circuit 32 includes a third capacitor C4, which is used for filtering and stabilizing the first power supply signal Vin to obtain a third output voltage signal Vo2, and the design can directly transmit another part of energy to the output circuit 3.
For the above-described booster circuit, the power of the output signal of the booster circuit is as follows:
Pout=Vout*Iout=（Vin+Vo1）*Iout=Vin*Iout+ Vo1*Iout；
wherein, the power loss Ploss is Vo1 Iout, and Vin Iout is a part of energy which does not pass through the isolation converter 2; vo1 Iout is another part of the energy passing through the isolated converter 2, i.e. the power loss Ploss is the loss caused by passing through the isolated converter 2; the output voltage Vo1 can be obtained by controlling the isolation converter 2, and further the energy passing through the isolation converter 2 can be controlled to occupy the total energy, wherein the smaller Vo1/Vout is, the smaller Vo1 Iout occupies the total transmission energy, the smaller the total loss is, and the higher the energy efficiency is.
As shown in fig. 6, the first switching circuit 251 includes a fifth transistor Q5, a diode D10, a sixth transistor Q6, a diode D10 and a diode D11, the fifth transistor Q5 and the diode D10 are connected in series between the first input terminal 21 and the second input terminal 22, the sixth transistor Q6 and the diode D10 are also connected in series between the first input terminal 21 and the second input terminal 22, the second processing circuit 252 includes a seventh capacitor C7 and a seventh inductor L7, the seventh capacitor C7 and the seventh inductor L7 are connected in series between a connection point of the fifth transistor Q5 and the sixth transistor Q6 and a primary side of the transformer 26, an intermediate capacitor Lm is connected in parallel to both sides of the primary side, and the first voltage signal Vin passes through the first switching circuit 251, the second processing circuit 252 and the transformer 26, and then is rectified by the rectifier diodes D5, D6 and the eighth capacitor C8 to output the second output voltage signal Vo1.
In another specific embodiment, as shown in fig. 7-10, fig. 7 is a circuit diagram of an isolated full-bridge circuit selected for use in the isolated converter in the embodiment shown in fig. 3, fig. 8 is a circuit diagram of an isolated half-bridge circuit selected for use in the isolated converter in the embodiment shown in fig. 3, fig. 9 is a circuit diagram of an isolated push-pull circuit selected for use in the isolated converter in the embodiment shown in fig. 3, and fig. 10 is a circuit diagram of an isolated flyback circuit selected for use in the isolated converter in the embodiment shown in fig. 3. The isolated converter 2 further comprises a first processing circuit 271, wherein the first processing circuit 271 is connected to the rectifying circuit 27 and is configured to process the signal output by the rectifying circuit to obtain a first output voltage signal.
As shown in fig. 7, in the scheme shown in fig. 7, the isolation converter 2 is an isolated full bridge circuit, the first processing circuit 271 includes a second inductor L2 and a ninth capacitor C9, and the first processing circuit 271 is configured to process the first power supply signal to obtain a first output voltage signal; specifically, a first switch S1 and a second switch S2 are connected in series between the first input end 21 and the second input end 22, a third switch S3 and a fourth switch S4 are further connected in series between the first input end 21 and the second input end 22, a first switch connection point (i.e., a connection point of the first switch S1 and the second switch S2) and a second switch connection point (i.e., a connection point of the third switch S3 and the fourth switch S4) are connected to a first primary side N1 of the transformer 26 for adjusting the first power supply signal Vin, an upper end of the first secondary side N21 and a lower end of the second secondary side N22 of the transformer 26 are connected to a second inductor L2 and a ninth capacitor C9 through a diode VD1 and a diode VD2, and the first power supply signal Vin is converted into a first output voltage signal.
As shown in fig. 8, in the scheme shown in fig. 8, the isolation converter 2 is a half-bridge circuit, a fifth switch S5 and a sixth switch S6 are connected in series between the first input terminal 21 and the second input terminal 22, a fifth capacitor C5 and a sixth capacitor C6 are simultaneously connected in series between the first input terminal 21 and the second input terminal 22, and a third switch connection point (i.e., a connection point of the fifth switch S5 and the sixth switch S6) and a first capacitor connection point (i.e., a connection point of the fifth capacitor C5 and the sixth capacitor C6) are connected to the second primary side N11 of the transformer 26; specifically, the first power supply signal Vin is converted by the fifth switch S5, the sixth switch S6, the fifth capacitor C5, and the sixth capacitor C6, and then input to the transformer 26, and then the upper end of the second upper secondary side N121 and the lower end of the second lower secondary side N122 of the transformer 26 are respectively rectified by the diode VD1 and the diode VD2, and then output by the first processing circuit 271 as the second output voltage signal Vo1.
As shown in fig. 9, in the scheme shown in fig. 9, the isolation converter 2 selects a push-pull circuit, the seventh switch S11 and the eighth switch S12 are respectively connected to the upper end of the third upper primary side N31 and the lower end of the third lower primary side N33 of the transformer 26, the first processing capacitor C31 is connected in parallel between the third upper primary side N31 and the third lower primary side N33 of the transformer, the first power supply signal Vin passes through the seventh switch S11, the eighth switch S12 and the first processing capacitor C31, then passes through the primary side of the transformer 26, then passes through the upper end of the third upper secondary side N32 of the transformer 26 and the lower end of the third lower secondary side N34, and then is rectified by the diode VD1 and the diode VD2 and rectified by the first processing circuit 271, and the second output voltage signal Vo1 is output.
As shown in fig. 10, in the scheme shown in fig. 10, the isolation converter 2 selects an isolation flyback circuit, the transformer 26 is a multi-winding transformer, the multi-winding transformer includes a first winding N51, a second winding N52 and a third winding N53, the second processing capacitor C51 is connected in parallel between the primary ends of the multi-winding transformer, the first winding N51 is connected in series with the ninth switch S51, the third winding N53 is connected in series with the diode VD53, the first power supply signal Vin passes through the second processing capacitor C51, the diode VD53, the ninth switch S51 and the multi-winding transformer, and then the second output voltage signal Vo1 is obtained through the diode VD51, the diode VD52 and the first processing circuit 271.
In yet another specific embodiment, as shown in fig. 11, fig. 11 is a circuit diagram of an isolation converter optional isolation forward circuit in the embodiment shown in fig. 3, and the isolation converter 2 includes a second filtering circuit 253 and a second switching circuit 254.
The second filter circuit 253 is connected to the first filter circuit 13 and the transformer 26, and is configured to filter the second power supply signal to obtain a third power supply signal. The second switch circuit 254 is connected to the second filter circuit 253 and the transformer 26, and is configured to open a path between the transformer 26 and the second filter circuit 253, so that the third power supply signal enters the transformer.
Further, as shown in fig. 11, the second filter circuit 253 includes a second filter capacitor C41, the second switch circuit 254 includes a tenth switch S41, the first power supply signal Vin is subjected to boost filtering through the second filter capacitor C41, the tenth switch S41 and the fourth primary side N41 of the transformer 26, then enters the fourth secondary side N42 of the transformer 26, and is rectified through the diode VD41 and the third filter capacitor C42 to output the second output voltage signal Vo1.
It is understood that in other embodiments, the isolated converter 2 is not limited to be connected in series above the photovoltaic power source as shown in fig. 3, and may also be arranged below the photovoltaic power source, as shown in fig. 12, where in the embodiment shown in fig. 12, the specific structure of the isolated converter 2 is the same as that in the above-mentioned scheme, and is not described herein again.
Referring to fig. 13, fig. 13 is a schematic structural diagram of an electronic device according to another embodiment of the present application, in which the boost circuit includes a photovoltaic power supply 1, an isolated converter 2, and an output capacitor 6.
The output end of the photovoltaic power supply 1 is connected in series with the input end of the isolation converter 2 for boosting conversion, the output end of the isolation converter 2 is connected in parallel with the output capacitor 6 for filtering, and then the converted output voltage is output, wherein the isolation converter 2 is an isolated direct current converter.
When boosting, the isolation converter 2 is connected in series with the photovoltaic power supply 1, all voltages of the photovoltaic power supply 1 are converted through the isolation converter 2, all voltages are superposed, the boosting effect is achieved, maximum efficiency tracking is achieved by controlling the characteristics of the isolation converter 2, most energy in the conversion process is directly output to a load without power conversion, and therefore system efficiency can be greatly improved.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.

Claims (7)

1. A boost circuit, comprising:
the power supply circuit comprises a first signal input end and a second signal input end, wherein the first signal input end and the second signal input end are both connected with an external power supply and used for outputting a first power supply signal;
the isolation converter is used for processing the first power supply signal to obtain a first output voltage signal and comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is connected with the first signal input end, and the second input end is connected with the second signal input end;
an output circuit for generating an output signal;
wherein the output signal comprises a second output voltage signal and a third output voltage signal, the output circuit comprising:
the first output circuit is connected with the first output end and the second output end and is used for processing the first output voltage signal to obtain a second output voltage signal;
the second output circuit is connected with the second output end and the second signal input end and is used for processing the first power supply signal to obtain a third output voltage signal;
wherein a ratio of the voltage of the second output voltage signal to the voltage of the third output voltage signal is less than a preset ratio;
the boost circuit further comprises a first filter circuit, wherein the first filter circuit is connected with the first signal input end, the second signal input end and the isolation converter, and is used for filtering the first power supply signal to obtain a second power supply signal and inputting the second power supply signal to the isolation converter;
the isolated converter further comprises:
the adjusting circuit is connected with the first filter circuit and used for processing the second power supply signal to obtain a second boosting signal and inputting the second boosting signal into the transformer; the adjusting circuit is used for being connected with a control chip so that the control chip can generate a control signal and input the control signal into the adjusting circuit to adjust the voltage of the second boosting signal;
the transformer is connected with the adjusting circuit and used for generating a first boosting signal based on the second boosting signal;
the rectifying circuit is connected with the transformer and is used for rectifying the first boosting signal to generate a first output voltage signal;
the first output circuit comprises a second capacitor, and the second capacitor is connected in parallel with the rectifying circuit and is used for filtering and stabilizing the first output voltage signal to obtain a second output voltage signal;
the second output circuit comprises a third capacitor, and the third capacitor is connected in series with the second capacitor and is used for filtering and stabilizing the first power supply signal to obtain a third output voltage signal.
2. The booster circuit according to claim 1,
the first filter circuit comprises a first capacitor, a first end of the first capacitor is connected with the first signal input end and the first input end, and a second end of the first capacitor is connected with the second signal input end.
3. The booster circuit according to claim 1,
the boost circuit further comprises a first processing circuit, wherein the first processing circuit is connected with the rectifying circuit and is used for processing the signal output by the rectifying circuit to obtain the first output voltage signal.
4. The booster circuit according to claim 1,
the boost circuit further comprises a first switch circuit and a second processing circuit, wherein the first switch circuit is connected with the first filter circuit and is used for processing the second power supply signal to obtain a third boost signal; the second processing circuit is connected with the first switch circuit and is used for filtering the third boosting signal to obtain the first boosting signal.
5. The boost circuit of claim 1, wherein the isolated converter further comprises:
the second filter circuit is connected with the first filter circuit and the transformer and is used for filtering the second power supply signal to obtain a third power supply signal;
and the second switching circuit is connected with the second filter circuit and the transformer and is used for conducting a path between the transformer and the second filter circuit so as to enable the third power supply signal to enter the transformer.
6. An electronic apparatus, characterized by comprising the booster circuit according to any one of claims 1 to 5.
7. The electronic device of claim 6,
the electronic device further comprises a control chip, wherein the control chip is connected with the adjusting circuit in the boost circuit and used for generating a control signal and inputting the control signal into the adjusting circuit so as to adjust the voltage of the first boost signal output by the isolation converter.
CN202210717219.8A 2022-06-23 2022-06-23 Boost circuit and electronic device Active CN114825942B (en)

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