CN219372285U - Voltage conversion circuit - Google Patents
Voltage conversion circuit Download PDFInfo
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- CN219372285U CN219372285U CN202320246432.5U CN202320246432U CN219372285U CN 219372285 U CN219372285 U CN 219372285U CN 202320246432 U CN202320246432 U CN 202320246432U CN 219372285 U CN219372285 U CN 219372285U
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- 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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Abstract
The embodiment of the utility model discloses a voltage conversion circuit, which comprises: an energizing module configured to output an energizing voltage in response to an input voltage; a control module configured to output a control signal and a drive signal in response to the energizing voltage; a switching module configured to output the input voltage in response to the control signal; a transformation module configured to convert the input voltage to an output voltage; the energy supply module is electrically connected to the control module, the control module is electrically connected to the switch module, and the switch module is electrically connected to the transformation module. By means of the mode, under the condition that an inductor or a transformer is not needed, the embodiment of the utility model can ensure that the circuit has enough starting working energy to ensure that the control module works normally when the input voltage is high, and the power density of the voltage conversion circuit is improved.
Description
Technical Field
The embodiment of the utility model relates to the field of power supplies, in particular to a voltage conversion circuit.
Background
In modern DC-DC module power supply designs, the power density requirement is higher and higher, and there is a standby loss requirement, when the input voltage range of the module is very wide and the voltage is very high, the traditional auxiliary power supply design often adopts a high-voltage BUCK circuit or flyback isolation circuit design to provide a dozen V for the module main control IC to initially work, when the input voltage is very high, the on-time of a power switch tube in the circuit becomes very short because of the small hollow ratio, and in order to ensure enough on-time, the switching frequency of the circuit work needs to be reduced, but the reduction of the switching frequency causes the inductor or transformer in the circuit to become large, the output capacitance capacity increases, and thus the module volume increases.
Disclosure of Invention
In order to solve the technical problems, the utility model adopts a technical scheme that: there is provided a voltage conversion circuit including: an energizing module configured to output an energizing voltage in response to an input voltage; a control module configured to output a control signal and a drive signal in response to the energizing voltage; a switching module configured to output the input voltage in response to the control signal; a transformation module configured to convert the input voltage to an output voltage; the energy supply module is electrically connected to the control module, the control module is electrically connected to the switch module, and the switch module is electrically connected to the transformation module.
In some embodiments, the voltage conversion circuit further comprises: a filtering module configured to filter the output voltage, the filtering module being electrically connected to the transformation module.
In some embodiments, the voltage conversion circuit further comprises: and a first voltage stabilizing circuit configured to output a first working voltage in response to the energy supply voltage, wherein an electric energy input end of the first voltage stabilizing circuit is electrically connected to the energy supply module, and an output end of the first voltage stabilizing circuit is electrically connected to the control module.
In some embodiments, the voltage conversion circuit further comprises: and the second voltage stabilizing circuit is configured to respond to the driving signal to convert the energy supply voltage into a second working voltage, the electric energy input end of the second voltage stabilizing circuit is electrically connected to the energy supply module, the signal input end of the second voltage stabilizing circuit is electrically connected to the control module, and the output end of the second voltage stabilizing circuit is electrically connected to the switch module.
In some embodiments, the power supply module includes a constant current source circuit and a first capacitor, wherein one end of the constant current source circuit is used for being connected with an output end of an input voltage source, the other end of the constant current source circuit is connected with one end of the first capacitor to form a first connection point, the other end of the first capacitor is grounded, and the input voltage is output by the input voltage source.
In some embodiments, the control module is a digital signal controller system, a sampling end of which is connected to the first connection point.
In some embodiments, the switching module comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein a source electrode of the first switching tube is connected to a drain electrode of the fourth switching tube to form a second connection point; the drain electrode of the third switching tube is connected to the drain electrode of the first switching tube, and the source electrode of the third switching tube is connected to the drain electrode of the second switching tube to form a third connection point; the source electrode of the fourth switching tube is connected to the other end of the first capacitor, and the source electrode of the second switching tube is connected to the source electrode of the fourth switching tube; the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are all connected to the control signal output end of the digital signal controller system.
In some embodiments, the transformation module comprises a transformer, a first diode, and a second diode, wherein one end of a primary side of the transformer is connected to the second connection point, and the other end of the primary side of the transformer is connected to the third connection point; one end of the secondary side of the transformer is connected to the anode of the first diode, and the other end of the secondary side of the transformer is connected to the anode of the second diode.
In some embodiments, the filtering module comprises a filtering inductor and a filtering capacitor, wherein one end of the filtering inductor is connected to the cathode of the first diode and the cathode of the second diode respectively, and the other end of the filtering inductor is connected to one end of the filtering capacitor; the other end of the filter capacitor is connected to the midpoint of the secondary side of the transformer.
In some embodiments, the constant current source circuit comprises a reference voltage source, a comparator, a fifth switching tube, a sixth switching tube, a seventh switching tube, a first resistor, a second resistor and a third resistor, wherein an output end of the reference voltage source is connected to a positive input end of the comparator, a negative input end of the comparator is connected to a closing signal output end of a digital signal controller system, and an output end of the comparator is connected to a grid electrode of the fifth switching tube; the drain electrode of the fifth switching tube is connected to the collector electrode of the sixth switching tube, and the source electrode of the fifth switching tube is connected to one end of the first capacitor to form the first connection point; the base electrode of the sixth switching tube is connected to the base electrode of the seventh switching tube to form a fourth connection point, and the emitter electrode of the sixth switching tube is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the second resistor and the emitter of the seventh switching tube respectively, and the collector of the seventh switching tube is connected to the fourth connection point and one end of the third resistor respectively; the other end of the second resistor is connected to the positive electrode of the input voltage source, and the other end of the third resistor is grounded.
The embodiment of the utility model has the beneficial effects that: compared with the prior art, the embodiment of the utility model can ensure that the circuit has enough starting working energy to ensure the normal operation of the control module and improve the power density of the voltage conversion circuit under the condition of not needing an inductor or a transformer when the input voltage is higher.
Drawings
Fig. 1 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present utility model;
FIG. 2 is a circuit topology of an energy supply module according to an embodiment of the present utility model;
fig. 3 is a circuit topology diagram of a switch module according to an embodiment of the present utility model;
fig. 4 is a circuit topology diagram of a voltage transformation module according to an embodiment of the present utility model;
fig. 5 is a circuit topology diagram of a filtering module according to an embodiment of the present utility model;
fig. 6 is a circuit topology diagram of a voltage conversion circuit according to an embodiment of the present utility model;
fig. 7 is a circuit topology diagram of a constant current source circuit according to an embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In order to solve the above-mentioned problems, an embodiment of the present application provides a voltage conversion circuit, whose structure is schematically shown in fig. 1, which includes an energy supply module 100, a control module 200, a switch module 300, a transformation module 400, a filtering module 500, a first voltage stabilizing circuit 600 and a second voltage stabilizing circuit 700, wherein,
the power supply module 100 is configured to output a power supply voltage in response to the input voltage, and the power supply module 100 is electrically connected to the control module 200, the power input terminal of the first voltage stabilizing circuit 600, and the power input terminal of the second voltage stabilizing circuit 700, respectively.
The control module 200 is configured to output a control signal and a driving signal in response to the supply voltage, and the control module 200 is electrically connected to the signal input terminal of the second voltage stabilizing circuit 700 and the switching module 300, respectively.
The switching module 300 is configured to output an input voltage in response to a control signal, and the switching module 300 is electrically connected to the transformation module 400.
The transformation module 400 is configured to convert an input voltage into an output voltage, and the transformation module 400 is electrically connected to the filtering module 500.
The filtering module 500 is configured to filter the output voltage.
The first voltage stabilizing circuit 600 is configured to output a first operating voltage in response to the energizing voltage, and an output terminal of the first voltage stabilizing circuit 600 is electrically connected to the control module 200.
The second voltage stabilizing circuit 700 is configured to convert the energizing voltage into a second operating voltage in response to the driving signal, and an output terminal of the second voltage stabilizing circuit 700 is electrically connected to the switch module 300.
In this embodiment, the power supply module 100 includes a constant current source circuit 110 and a first capacitor C1, the circuit topology of which is shown in fig. 2, wherein,
one end of the constant current source circuit 110 is used for being connected with an output end of an input voltage source, the other end of the constant current source circuit 110 is connected to one end of the first capacitor C1 to form a first connection point A, and the other end of the first capacitor C1 is grounded. The input voltage source is used for outputting an input voltage.
In this embodiment, the control module 200 is a digital signal controller system.
A Digital Signal Controller (DSC) is a hybrid microcontroller and Digital Signal Processor (DSP) implementation. Like microcontrollers, digital signal controllers have a fast interrupt response, provide control-oriented peripherals such as PWM and watchdog timers, and although they can be programmed using the native assembly language of the device, they are typically programmed using the C programming language. In terms of DSP, they incorporate the functions that most DSP has, digital signal controllers are widely used, but most are used for motor control, power conversion and sensor processing applications. Currently, digital signal controllers are marketed as green technology due to their potential to reduce power consumption of motors and power supplies. In this embodiment, the switching module 300 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, and the circuit topology thereof is shown in fig. 3, wherein,
the source of the first switching tube Q1 is connected to the drain of the fourth switching tube Q4 to form a second connection point B, and the drain of the third switching tube Q3 is connected to the drain of the first switching tube Q1.
The source of the third switching tube Q3 is connected to the drain of the second switching tube Q2 to form a third connection point C. The source of the second switching tube Q2 is connected to the source of the fourth switching tube Q4.
In this embodiment, the transformation module 400 includes a transformer T, a first diode D1 and a second diode D2, and the schematic structure is shown in fig. 4, in which,
one end of the secondary side of the transformer T is connected to the anode of the first diode D1, and the other end of the secondary side of the transformer T is connected to the anode of the second diode D2.
In this embodiment, the filtering module 500 includes a filtering inductor L and a filtering capacitor Co, and a circuit topology diagram of the filtering inductor L is shown in fig. 5, where one end of the filtering inductor L is connected to one end of the filtering capacitor Co.
Based on the above-mentioned power supply module 100, control module 200, switching module 300, transformation module 400 and filtering module 500, the present embodiment provides a voltage conversion circuit, whose circuit topology is shown in fig. 6, which includes a first voltage stabilizing circuit 600, a second voltage stabilizing circuit 700, a constant current source circuit 110, a digital signal controller system 210, a first capacitor C1, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a transformer T, a first diode D1, a second diode D2, a filtering inductor L and a filtering capacitor Co, wherein,
one end of the constant current source circuit 110 is used for being connected with an output end of an input voltage source, the other end of the constant current source circuit 110 is connected to one end of the first capacitor C1 to form a first connection point A, and the other end of the first capacitor C1 is grounded.
The drain of the first switching tube Q1 is connected to one end of the constant current source circuit 110, and the source of the first switching tube Q1 is connected to the drain of the fourth switching tube Q4 to form a second connection point B.
The drain of the third switching tube Q3 is connected to the drain of the first switching tube Q1. The source of the third switching tube Q3 is connected to the drain of the second switching tube Q2 to form a third connection point C.
The source of the fourth switching tube Q4 is connected to the other end of the first capacitor C1, and the source of the second switching tube Q2 is connected to the source of the fourth switching tube Q4.
The gates of the first, second, third and fourth switching transistors Q1, Q2, Q3 and Q4 are all connected to the control signal output of the digital signal controller system 210.
One end of the primary side of the transformer T is connected to the second connection point B, and the other end of the primary side of the transformer T is connected to the third connection point C.
One end of the secondary side of the transformer T is connected to the anode of the first diode D1, and the other end of the secondary side of the transformer T is connected to the anode of the second diode D2.
One end of the filter inductance L is connected to the cathode of the first diode D1 and the cathode of the second diode D2 respectively, and one end of the filter inductance L is connected to one end of the filter capacitance Co. The other end of the filter capacitor Co is connected to the midpoint of the secondary side of the transformer T.
When the input voltage source is activated, the input voltage Vin is applied to the constant current source circuit 110, so that it generates a constant current to charge the first capacitor C1. At this time, the voltage on the first capacitor C1 gradually increases, i.e. the level of the first connection point a gradually increases, and the voltage of the first connection point a is the energy supply voltage.
When the power supply voltage reaches a certain threshold, the first voltage stabilizing circuit 600 is enabled to start working and output the first working voltage required by the digital signal controller system 210. The digital signal controller system 210 is caused to start a/D sampling of the first connection point a and start calculating and judging whether the supply voltage satisfies the initial operation energy required for the switching unit constituted by the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4.
When the digital signal controller system 210 determines that the supply voltage is sufficient, the digital signal controller system 210 outputs a driving signal to the second voltage stabilizing circuit 700 to control the second voltage stabilizing circuit 700 to start operating. The second voltage stabilizing circuit 700 starts to convert the supply voltage into the driving voltages required by the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4, and the digital signal controller system 210 starts the internal PWM generating circuit to generate the control signal to control the on or off of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4.
After the digital signal controller system 210 determines that the circuit is operating normally, it outputs a shutdown signal to the constant current source circuit 110, so that the constant current source circuit 100 stops operating.
In this embodiment, the control signal is a PWM signal.
The embodiment also provides a constant current source circuit, and in this embodiment, a first capacitor C1 is added for convenience of explanation. As shown in fig. 7, the circuit topology of the constant current source circuit includes a reference voltage source 111, a comparator 112, a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7, a first resistor R1, a second resistor R2, and a third resistor R3,
the output terminal of the reference voltage source 111 is connected to the positive input terminal of the comparator 112, the negative input terminal of the comparator 112 is connected to the off signal output terminal of the digital signal controller system 210, and the output terminal of the comparator 112 is connected to the gate of the fifth switching transistor Q5.
The drain electrode of the fifth switching tube Q5 is connected to the collector electrode of the sixth switching tube Q6, and the source electrode of the fifth switching tube Q5 is connected to one end of the first capacitor to form a first connection point a.
The base of the sixth switching tube Q6 is connected to the base of the seventh switching tube Q7 to form a fourth connection point D, and the emitter of the sixth switching tube Q6 is connected to one end of the first resistor R1.
The other end of the first resistor R1 is connected to one end of the second resistor R2 and the emitter of the seventh switching tube Q7, respectively, and the collector of the seventh switching tube Q7 is connected to the fourth connection point D and one end of the third resistor R3, respectively.
The other end of the second resistor R2 is used for being connected to the positive electrode of the input voltage source so as to introduce the input voltage Vin, and the other end of the third resistor R3 is grounded.
Compared with the prior art, the embodiment of the utility model can ensure that the circuit has enough conduction time when the input voltage is higher on the premise of not increasing the volume of the inductor or the transformer and increasing the capacity of the capacitor, and improves the power density of the voltage conversion circuit.
It should be noted that the description of the present utility model and the accompanying drawings illustrate preferred embodiments of the present utility model, but the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are provided for a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.
Claims (10)
1. A voltage conversion circuit, comprising:
an energizing module configured to output an energizing voltage in response to an input voltage;
a control module configured to output a control signal and a drive signal in response to the energizing voltage;
a switching module configured to output the input voltage in response to the control signal;
a transformation module configured to convert the input voltage to an output voltage;
the energy supply module is electrically connected to the control module, the control module is electrically connected to the switch module, and the switch module is electrically connected to the transformation module.
2. The circuit of claim 1, further comprising:
a filtering module configured to filter the output voltage, the filtering module being electrically connected to the transformation module.
3. The circuit of claim 2, further comprising:
and a first voltage stabilizing circuit configured to output a first working voltage in response to the energy supply voltage, wherein an electric energy input end of the first voltage stabilizing circuit is electrically connected to the energy supply module, and an output end of the first voltage stabilizing circuit is electrically connected to the control module.
4. A circuit according to claim 3, further comprising:
and the second voltage stabilizing circuit is configured to respond to the driving signal to convert the energy supply voltage into a second working voltage, the electric energy input end of the second voltage stabilizing circuit is electrically connected to the energy supply module, the signal input end of the second voltage stabilizing circuit is electrically connected to the control module, and the output end of the second voltage stabilizing circuit is electrically connected to the switch module.
5. The circuit of claim 4 wherein the energizing means comprises a constant current source circuit and a first capacitor, wherein,
one end of the constant current source circuit is used for being connected with the output end of the input voltage source, the other end of the constant current source circuit is connected to one end of the first capacitor to form a first connection point, the other end of the first capacitor is grounded, and the input voltage is output by the input voltage source.
6. The circuit of claim 5, wherein the control module is a digital signal controller system having a sampling end connected to the first connection point.
7. The circuit of claim 6, wherein the switching module comprises a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube, wherein,
the source electrode of the first switching tube is connected to the drain electrode of the fourth switching tube to form a second connection point;
the drain electrode of the third switching tube is connected to the drain electrode of the first switching tube, and the source electrode of the third switching tube is connected to the drain electrode of the second switching tube to form a third connection point;
the source electrode of the fourth switching tube is connected to the other end of the first capacitor, and the source electrode of the second switching tube is connected to the source electrode of the fourth switching tube;
the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are all connected to the control signal output end of the digital signal controller system.
8. The circuit of claim 7, wherein the transformation module comprises a transformer, a first diode, and a second diode, wherein,
one end of the primary side of the transformer is connected to the second connection point, and the other end of the primary side of the transformer is connected to the third connection point;
one end of the secondary side of the transformer is connected to the anode of the first diode, and the other end of the secondary side of the transformer is connected to the anode of the second diode.
9. The circuit of claim 8, wherein the filter module comprises a filter inductance and a filter capacitance, wherein,
one end of the filter inductor is connected to the cathode of the first diode and the cathode of the second diode respectively, and the other end of the filter inductor is connected to one end of the filter capacitor;
the other end of the filter capacitor is connected to the midpoint of the secondary side of the transformer.
10. The circuit of claim 5 wherein the constant current source circuit comprises a reference voltage source, a comparator, a fifth switching tube, a sixth switching tube, a seventh switching tube, a first resistor, a second resistor, and a third resistor, wherein,
the output end of the reference voltage source is connected to the positive input end of the comparator, the negative input end of the comparator is connected to the closing signal output end of the digital signal controller system, and the output end of the comparator is connected to the grid electrode of the fifth switching tube;
the drain electrode of the fifth switching tube is connected to the collector electrode of the sixth switching tube, and the source electrode of the fifth switching tube is connected to one end of the first capacitor to form the first connection point;
the base electrode of the sixth switching tube is connected to the base electrode of the seventh switching tube to form a fourth connection point, and the emitter electrode of the sixth switching tube is connected to one end of the first resistor;
the other end of the first resistor is connected to one end of the second resistor and the emitter of the seventh switching tube respectively, and the collector of the seventh switching tube is connected to the fourth connection point and one end of the third resistor respectively;
the other end of the second resistor is connected to the positive electrode of the input voltage source, and the other end of the third resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320246432.5U CN219372285U (en) | 2023-02-02 | 2023-02-02 | Voltage conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320246432.5U CN219372285U (en) | 2023-02-02 | 2023-02-02 | Voltage conversion circuit |
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| CN219372285U true CN219372285U (en) | 2023-07-18 |
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| CN202320246432.5U Active CN219372285U (en) | 2023-02-02 | 2023-02-02 | Voltage conversion circuit |
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| CN (1) | CN219372285U (en) |
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