CN211089462U - DC-DC converter integrating linear power supply and switching power supply - Google Patents
DC-DC converter integrating linear power supply and switching power supply Download PDFInfo
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- CN211089462U CN211089462U CN202020112924.1U CN202020112924U CN211089462U CN 211089462 U CN211089462 U CN 211089462U CN 202020112924 U CN202020112924 U CN 202020112924U CN 211089462 U CN211089462 U CN 211089462U
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Abstract
The application provides a DC-DC converter fusing a linear power supply and a switching power supply, which comprises a voltage input end, a voltage output end, a first grounding end, a second grounding end, an MOS tube, an L C filter circuit, an output voltage stabilizing circuit, a first resistor, a first capacitor, a diode and an MOS tube control circuit, wherein when high voltage needs to be output, the voltage input end, the voltage output end, the first grounding end, the second grounding end, the MOS tube, a L C filter circuit, the output voltage stabilizing circuit, the first resistor and the first capacitor form a BUCK converter, when low voltage needs to be output, the voltage dividing ratio of the second resistor and the voltage dividing adjusting circuit can be adjusted through the voltage dividing adjusting circuit in the MOS tube control circuit, the pulse amplitude of the grid of the MOS tube is reduced, the MOS tube works in a linear state, namely a non-saturated state, the circuit is converted into the linear voltage stabilizing circuit of a series adjusting tube, the circuit can realize the functions of the switching power supply and the linear power supply, and the voltage of the switching power supply when the ripple voltage output is improved.
Description
Technical Field
The application relates to the technical field of voltage converters, in particular to a DC-DC converter fusing a linear power supply and a switching power supply.
Background
Currently, the ripple of the conventional switching power supply is slightly larger than that of the linear power supply. However, the switching power supply has significant advantages in terms of volume and conversion efficiency compared with the linear power supply, and therefore how to improve the output ripple of the switching power supply is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a DC-DC converter fusing a linear power supply and a switching power supply, which is used for realizing the technical effect of improving the output ripple of the switching power supply.
The embodiment of the application provides a DC-DC converter integrating a linear power supply and a switching power supply, and the DC-DC converter comprises a voltage input end, a voltage output end, a first grounding end, a second grounding end, an MOS (metal oxide semiconductor) tube, an L C filter circuit, an output voltage stabilizing circuit, a first resistor, a first capacitor, a diode and an MOS tube control circuit, wherein the MOS tube control circuit comprises a power supply management chip, a second resistor connected with a pulse output pin of the power supply management chip, an output circuit connected with the second resistor, a voltage division regulating circuit connected with the second resistor, a first end of the second resistor is connected with the pulse output pin, a second end of the second resistor is respectively connected with the output circuit and the voltage division regulating circuit, a first end of the first capacitor is connected with the voltage input end, a second end of the first capacitor is connected with the first grounding end, a first end of the first resistor is connected with a second end of the first capacitor, an anode of the diode is connected with a drain electrode of the MOS tube, a cathode of the diode is connected with an anode L C filter circuit, a source electrode of the first resistor is connected with a source electrode of the MOS tube, and a source electrode of the MOS tube is connected with a source electrode of the MOS tube output.
Furthermore, the voltage division adjusting circuit comprises a reference voltage end, an adjustable resistor, a third grounding end, a comparator circuit, a first switch tube and a fourth grounding end; the first end of the adjustable resistor is connected with the reference voltage end; the second end of the adjustable resistor is connected with the third grounding end; the slide arm of the adjustable resistor is connected with the anode of the comparator circuit; the negative electrode of the comparator circuit is connected with the feedback voltage signal end of the power management chip; the output end of the comparator circuit is connected with the base electrode of the first switching tube; the collector of the first switching tube is connected with the second end of the second resistor; and the emitter of the first switching tube is connected with the fourth grounding end.
Furthermore, the comparator circuit comprises an operational amplifier, a second capacitor, a third resistor, a fourth resistor and a fifth grounding terminal; the anode of the operational amplifier is connected with the slide arm of the adjustable resistor; the negative electrode of the operational amplifier is connected with the feedback voltage signal end of the power management chip; the power supply end of the operational amplifier and the first end of the third resistor are both connected with the voltage input end; the grounding end of the operational amplifier is connected with the fifth grounding end; the second end of the third resistor is connected with the output end of the operational amplifier; the first end of the second capacitor and the first end of the fourth resistor are both connected with the output end of the operational amplifier; and the second end of the second capacitor and the second end of the fourth resistor are both connected with the negative electrode of the operational amplifier.
Further, the MOS tube control circuit further comprises a phototriode; the collector of the phototriode is connected with the voltage input end; and the emitter of the phototriode is respectively connected with the feedback voltage signal end of the power management chip and the cathode of the comparator circuit.
Further, the MOS transistor control circuit further includes a sixth ground terminal; the grounding pin of the power management chip is connected with the sixth grounding end; a filter capacitor is arranged between the reference voltage pin, the timing pin, the power pin, the current sampling pin and the sixth grounding terminal of the power management chip; and a fifth resistor is arranged between the feedback voltage signal end and the sixth grounding end.
The output voltage stabilizing circuit further comprises a sixth resistor, a light emitting diode, a three-terminal voltage regulator tube, a seventh resistor, a seventh grounding terminal, a third capacitor, an eighth resistor and a ninth resistor, wherein the first end of the sixth resistor is connected with the anode output terminal of the L C filter circuit, the second end of the sixth resistor is connected with the anode of the light emitting diode, the first end of the seventh resistor and the cathode of the three-terminal voltage regulator tube are both connected with the cathode of the light emitting diode, the grounding electrode of the three-terminal voltage regulator tube is connected with the seventh grounding terminal, the second end of the seventh resistor is connected with the first end of the third capacitor, the second end of the third capacitor and the anode of the three-terminal voltage regulator tube are both connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the anode output terminal of the L C filter circuit, the first end of the ninth resistor is connected with the anode of the third voltage regulator tube, and the second end of the ninth resistor is connected with the seventh grounding terminal.
Furthermore, the output circuit comprises a second triode, a third triode, a fourth capacitor, an eighth grounding terminal and a ninth grounding terminal; the base electrode of the second triode and the base electrode of the third triode are both connected with the pulse output pin of the power management chip; a collector of the second triode is connected with the voltage input end, and an emitter of the second triode is connected with a collector of the third triode; an emitter of the third triode is connected with the eighth grounding end; the first end of the fourth capacitor is connected with the voltage input end; and the second end of the fourth capacitor is connected with the ninth grounding end.
The BUCK converter has the advantages that when high voltage needs to be output, the BUCK converter is composed of the voltage input end, the voltage output end, the first grounding end, the second grounding end, the MOS tube, the L C filter circuit, the output voltage stabilizing circuit, the first resistor and the first capacitor, when low voltage needs to be output, the voltage division ratio of the second resistor and the voltage division adjusting circuit can be adjusted through the voltage division adjusting circuit in the MOS tube control circuit, the pulse amplitude of the grid electrode of the MOS tube is reduced, the MOS tube works in a linear state, namely a non-saturated state, the circuit is converted into the linear voltage stabilizing circuit of the series adjusting tube, the circuit can achieve the functions of the switching power supply and the linear power supply, and voltage ripples of the switching power supply during low voltage output are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a topology of a DC-DC converter according to an embodiment of the present application;
FIG. 2 is a schematic diagram I of a DC-DC converter circuit provided in an embodiment of the present application;
fig. 3 is a schematic diagram II of a DC-DC converter provided in an embodiment of the present application;
fig. 4 is a schematic diagram III of a DC-DC converter provided in an embodiment of the present application.
The figure shows a 10-DC-DC converter, a 100-L C filter circuit, a 200-MOS tube control circuit, a 210-output circuit, a 220-voltage division regulating circuit, a 300-output voltage stabilizing circuit and a 400-input voltage stabilizing circuit.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic diagram of a topology of a DC-DC converter according to an embodiment of the present disclosure; FIG. 2 is a schematic diagram I of a DC-DC converter circuit provided in an embodiment of the present application; fig. 3 is a schematic diagram II of a DC-DC converter provided in an embodiment of the present application; fig. 4 is a schematic diagram III of a DC-DC converter provided in an embodiment of the present application.
The DC-DC conversion provided by the embodiment of the present application includes a voltage input terminal VCC, a voltage output terminal, VOUT +, a first ground terminal, a second ground terminal, a MOS transistor Q4, a L C filter circuit, an output voltage stabilizing circuit 300, a first resistor R13, a first capacitor C16, and a MOS transistor control circuit 200;
the MOS tube control circuit comprises a power management chip U1; the second resistor R3 is connected with a pulse output pin of the power management chip U1; an output circuit 210 connected to the second resistor R3; a voltage division adjusting circuit 220 connected to the second resistor R3; a first end of the second resistor R3 is connected with the pulse output pin; a second end of the second resistor R3 is connected to the output circuit 210 and the voltage division adjusting circuit 220 respectively; a first end of the first capacitor C16 is connected to the voltage input terminal; the second end and the first ground end of the first capacitor C16; a first end of the first resistor R13 is connected with a second end of the first capacitor; the second end of the first resistor R13 is connected with the source electrode of the MOS transistor Q4; the source electrode of the MOS tube Q4 is connected with a current sampling pin of the power management chip U1; the gate of the MOS transistor Q4 is connected to the pulse output terminal of the output circuit 210.
L C filter circuit includes an inductor L1 and a plurality of filter capacitors, wherein a first terminal of the inductor is connected to a voltage input terminal, a second terminal of the inductor is connected to an anode of each filter capacitor, and a cathode of each filter capacitor is connected to a second ground terminal, in one embodiment, the L C filter circuit may include a capacitor C9, a capacitor C10, and a capacitor C11, wherein a first terminal of the capacitor C9, a first terminal of the capacitor C10, and a first terminal of the capacitor C11 are connected to the second terminal of the inductor L1, and a second terminal of the capacitor C9, a second terminal of the capacitor C10, and a second terminal of the capacitor C11 are connected to the second ground terminal.
In order to protect the components, a resistor R14 can be arranged between the source of the MOS tube and the current sampling pin of the power management chip, and a resistor R12 can be arranged between the gate of the MOS tube and the pulse output end.
In one embodiment, the voltage division adjusting circuit includes a reference voltage terminal VREF, an adjustable resistor R7, a third ground terminal, a comparator circuit, a first switch tube Q1, and a fourth ground terminal; a first end of the adjustable resistor R7 is connected with a reference voltage end VREF; the second end of the adjustable resistor R7 is connected with a third grounding end; the slide arm of the adjustable resistor R7 is connected with the anode of the comparator circuit; the negative electrode of the comparator circuit is connected with a feedback voltage signal end FB of the power management chip U1; the output end of the comparator circuit is connected with the base electrode of the first switching tube Q1; the collector of the first switch tube Q1 is connected with the second end of the second resistor R3; the emitter of the first switching tube Q1 is connected to the fourth ground terminal.
In order to protect the components, a resistor R8 may be disposed between the second end of the adjustable resistor and the third ground, a resistor R5 may be disposed between the slider of the adjustable resistor and the positive electrode of the comparator circuit, and a resistor R6 may be disposed between the feedback voltage signal end of the power management chip and the negative electrode of the comparator circuit.
In one embodiment, the comparator circuit includes an operational amplifier U2, a second capacitor C7, a third resistor R11, a fourth resistor R10, and a fifth ground; the anode of the operational amplifier U2 is connected with the slide arm of the adjustable resistor R7; the negative electrode of the operational amplifier U2 is connected with the feedback voltage signal end FB of the power management chip U1; the power supply end of the operational amplifier U2 and the first end of the third resistor R11 are both connected with the voltage input end VCC; the grounding end of the operational amplifier U2 is connected with the fifth grounding end; the second end of the third resistor R11 is connected with the output end of the operational amplifier U2; a first end of the second capacitor C7 and a first end of the fourth resistor R10 are both connected with the output end of the operational amplifier U2; the second end of the second capacitor C7 and the second end of the fourth resistor R10 are both connected to the negative terminal of the operational amplifier U2. A resistor R9 may be further disposed between the second end of the second capacitor C7 and the negative electrode of the operational amplifier U2, and a capacitor C6 may be further disposed between the power supply terminal of the operational amplifier U2 and the fifth ground terminal to filter the signal at the voltage input terminal.
The MOS tube control circuit also comprises a phototriode OT 1-A; the collector of the phototriode OT1-A is connected with a voltage input end VCC; the emitter of the phototriode OT1-A is respectively connected with the feedback voltage signal terminal FB of the power management chip U1 and the cathode of the comparator circuit, and is used for generating a feedback signal.
The MOS tube control circuit also comprises a sixth grounding end; the ground pin GND of the power management chip U1 is connected with a sixth ground terminal; filter capacitors are arranged between a reference voltage pin VREF, a timing pin RT/CT, a power supply pin VDD, a current sampling pin CS and a sixth grounding terminal of the power supply management chip U1; a fifth resistor R20 is disposed between the feedback voltage signal terminal FB and the sixth ground terminal.
Specifically, the reference voltage pin VREF is connected to the sixth ground terminal through a filter capacitor C1; the timing pin RT/CT is connected with a sixth grounding end through a filter capacitor C2; the power supply pin VDD is connected with the sixth ground terminal through a filter capacitor C4; the current sampling pin CS is connected to the sixth ground terminal through a filter capacitor C8.
The output voltage stabilizing circuit comprises a sixth resistor R18, a light emitting diode OT1-B, a three-terminal voltage regulator tube U3, a seventh resistor R17, a seventh grounding terminal, a third capacitor C12, an eighth resistor R15 and a ninth resistor R16, wherein the first end of the sixth resistor R18 is connected with the anode output end of the L C filter circuit, the second end of the sixth resistor R18 is connected with the anode of the light emitting diode OT1-B, the first end of the seventh resistor R17 and the cathode of the three-terminal voltage regulator tube U3 are both connected with the cathode of the light emitting diode OT1-B, the grounding electrode of the three-terminal voltage regulator tube U3 is connected with the seventh grounding terminal, the second end of the seventh resistor R17 is connected with the first end of the third capacitor C9, the second end of the third capacitor C12 and the anode of the three-terminal voltage regulator tube U3 are both connected with the first end of the eighth resistor R15, the second end of the eighth resistor R15 is connected with the anode 6L C filter circuit, and the third end of the ninth resistor R87458 is connected with the anode output terminal of the ninth voltage regulator tube R36 16.
The output circuit comprises a second triode Q2, a third triode Q3, a fourth capacitor C5, an eighth grounding end, a ninth grounding end and a pulse output end; the base electrode of the second triode Q2 and the base electrode of the third triode Q3 are both connected with the pulse output pin DR of the power management chip U1; the collector of the second triode Q2 is connected with the voltage input end VCC, and the emitter of the second triode Q2 is connected with the collector of the third triode Q3; the emitter of the third triode Q3 is connected to the eighth ground terminal; a first end of the fourth capacitor C5 is connected to the voltage input terminal VCC; a second end of the fourth capacitor C5 is connected to a ninth ground terminal; the pulse output end is connected with the grid electrode of the MOS tube Q4.
As shown in fig. 4, an input voltage stabilizing circuit 400 connected to the voltage input terminal may be further provided for stabilizing the input voltage at the voltage input terminal.
In summary, the application provides a DC-DC converter integrating a linear power supply and a switching power supply, which comprises a voltage input end, a voltage output end, a first grounding end, a second grounding end, an MOS tube, an L C filter circuit, an output voltage stabilizing circuit, a first resistor, a first capacitor and an MOS tube control circuit, wherein the MOS tube control circuit comprises a power supply management chip, a second resistor connected with a pulse output pin of the power supply management chip, an output circuit connected with the second resistor, and a voltage division regulating circuit connected with the second resistor, wherein the first end of the second resistor is connected with the pulse output pin, the second end of the second resistor is respectively connected with the output circuit and the voltage division regulating circuit, the first end of the first capacitor is connected with the voltage input end, the second end of the first capacitor is connected with the first grounding end, the first end of the first resistor is connected with the second end of the first capacitor, the second end of the first resistor is connected with the source electrode of the MOS tube, the source electrode of the power supply management chip is connected with the pulse output end of the output circuit, the gate of the MOS tube can realize the switching function of the power supply, and can also realize the low ripple output function of the switching power supply.
It should be noted that the above mentioned embodiments are only specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A DC-DC converter integrating a linear power supply and a switching power supply is characterized by comprising a voltage input end, a voltage output end, a first grounding end, a second grounding end, an MOS (metal oxide semiconductor) tube, an L C filter circuit, an output voltage stabilizing circuit, a first resistor, a first capacitor, a diode and an MOS tube control circuit;
the MOS tube control circuit comprises a power management chip; the second resistor is connected with a pulse output pin of the power management chip; the output circuit is connected with the second resistor; the voltage division regulating circuit is connected with the second resistor; the first end of the second resistor is connected with the pulse output pin; the second end of the second resistor is respectively connected with the output circuit and the voltage division regulating circuit;
the first end of the first capacitor is connected with the voltage input end, the second end of the first capacitor is connected with the first grounding end, the first end of the first resistor is connected with the second end of the first capacitor, the anode of the diode is connected with the drain electrode of the MOS tube, the cathode of the diode is connected with the anode input end of the L C filter circuit, the second end of the first resistor is connected with the source electrode of the MOS tube, the source electrode of the MOS tube is connected with the current sampling pin of the power management chip, and the grid electrode of the MOS tube is connected with the pulse output end of the output circuit.
2. The DC-DC converter integrating the linear power supply and the switching power supply according to claim 1, wherein the voltage division adjusting circuit comprises a reference voltage terminal, an adjustable resistor, a third ground terminal, a comparator circuit, a first switch tube and a fourth ground terminal;
the first end of the adjustable resistor is connected with the reference voltage end; the second end of the adjustable resistor is connected with the third grounding end; the slide arm of the adjustable resistor is connected with the anode of the comparator circuit; the negative electrode of the comparator circuit is connected with the feedback voltage signal end of the power management chip; the output end of the comparator circuit is connected with the base electrode of the first switching tube; the collector of the first switching tube is connected with the second end of the second resistor; and the emitter of the first switching tube is connected with the fourth grounding end.
3. The DC-DC converter of the combined linear power supply and switching power supply as claimed in claim 2, wherein the comparator circuit comprises an operational amplifier, a second capacitor, a third resistor, a fourth resistor, and a fifth ground terminal; the anode of the operational amplifier is connected with the slide arm of the adjustable resistor; the negative electrode of the operational amplifier is connected with the feedback voltage signal end of the power management chip; the power supply end of the operational amplifier and the first end of the third resistor are both connected with the voltage input end; the grounding end of the operational amplifier is connected with the fifth grounding end; the second end of the third resistor is connected with the output end of the operational amplifier; the first end of the second capacitor and the first end of the fourth resistor are both connected with the output end of the operational amplifier; and the second end of the second capacitor and the second end of the fourth resistor are both connected with the negative electrode of the operational amplifier.
4. The DC-DC converter of a combined linear power supply and switching power supply of claim 2, wherein the MOS transistor control circuit further comprises a phototransistor; the collector of the phototriode is connected with the voltage input end; and the emitter of the phototriode is respectively connected with the feedback voltage signal end of the power management chip and the cathode of the comparator circuit.
5. The DC-DC converter of a combined linear power supply and switching power supply as claimed in claim 2, wherein the MOS transistor control circuit further includes a sixth ground terminal; the grounding pin of the power management chip is connected with the sixth grounding end; a filter capacitor is arranged between the reference voltage pin, the timing pin, the power pin, the current sampling pin and the sixth grounding terminal of the power management chip; and a fifth resistor is arranged between the feedback voltage signal end and the sixth grounding end.
6. The DC-DC converter fusing the linear power supply and the switching power supply according to claim 1, wherein the output voltage stabilizing circuit comprises a sixth resistor, a light emitting diode, a three-terminal voltage regulator tube, a seventh resistor, a seventh ground terminal, a third capacitor, an eighth resistor and a ninth resistor, wherein a first end of the sixth resistor is connected with an anode output terminal of the L C filter circuit, a second end of the sixth resistor is connected with an anode of the light emitting diode, a first end of the seventh resistor and a cathode of the three-terminal voltage regulator tube are both connected with a cathode of the light emitting diode, a ground electrode of the three-terminal voltage regulator tube is connected with the seventh ground terminal, a second end of the seventh resistor is connected with a first end of the third capacitor, a second end of the third capacitor and an anode of the three-terminal voltage regulator tube are both connected with a first end of the eighth resistor, a second end of the eighth resistor is connected with an anode output terminal of the L C filter circuit, a first end of the ninth resistor is connected with an anode of the three-terminal voltage regulator tube, and a second end of the ninth resistor is connected with the seventh ground terminal.
7. The DC-DC converter of claim 1, wherein the output circuit comprises a second transistor, a third transistor, a fourth capacitor, an eighth ground terminal, and a ninth ground terminal; the base electrode of the second triode and the base electrode of the third triode are both connected with the pulse output pin of the power management chip; a collector of the second triode is connected with the voltage input end, and an emitter of the second triode is connected with a collector of the third triode; an emitter of the third triode is connected with the eighth grounding end; the first end of the fourth capacitor is connected with the voltage input end; and the second end of the fourth capacitor is connected with the ninth grounding end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020112924.1U CN211089462U (en) | 2020-01-17 | 2020-01-17 | DC-DC converter integrating linear power supply and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020112924.1U CN211089462U (en) | 2020-01-17 | 2020-01-17 | DC-DC converter integrating linear power supply and switching power supply |
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| Publication Number | Publication Date |
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| CN211089462U true CN211089462U (en) | 2020-07-24 |
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| CN202020112924.1U Active CN211089462U (en) | 2020-01-17 | 2020-01-17 | DC-DC converter integrating linear power supply and switching power supply |
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