CN216252532U - DC-DC converter - Google Patents
DC-DC converter Download PDFInfo
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- CN216252532U CN216252532U CN202122457748.2U CN202122457748U CN216252532U CN 216252532 U CN216252532 U CN 216252532U CN 202122457748 U CN202122457748 U CN 202122457748U CN 216252532 U CN216252532 U CN 216252532U
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to a DC-DC converter, which comprises a voltage stabilizing chip, an LC filter circuit and a feedback circuit. The voltage input pin of the voltage stabilizing chip is connected with direct-current voltage, the voltage output pin is connected with the input end of the LC filter circuit, and the output end of the LC filter circuit is connected with the feedback pin of the voltage stabilizing chip through the feedback circuit. The DC-DC converter has the advantages that the output voltage after the input voltage is processed is stable through the voltage stabilizing chip 110, the LC filter circuit and the voltage stabilizing, filtering and overvoltage protection functions of the feedback circuit, and the DC-DC converter is small in electronic components and convenient to miniaturize and modularize.
Description
Technical Field
The utility model relates to the field of power electronic equipment, in particular to a DC-DC converter.
Background
The DC-DC converter is a voltage converter that effectively outputs a fixed voltage after converting an input voltage. DC-DC converters are divided into three categories: step-up, step-down, and step-up and step-down converters. Three types of control can be used as required. DC-DC converters are widely used in products such as mobile phones, MP3, digital cameras, portable media players, and the like.
Nowadays, power electronic equipment is developed towards modularization, and how to keep the output voltage of a DC-DC converter stable on the basis of reducing the use of electronic components is a trend of reducing the volume and modularizing the power electronic equipment.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a DC-DC converter having fewer components and a stable output voltage.
A DC-DC converter comprises a voltage stabilizing chip, an LC filter circuit and a feedback circuit, wherein a voltage input pin of the voltage stabilizing chip is connected with direct-current voltage, a voltage output pin is connected with an input end of the LC filter circuit, and an output end of the LC filter circuit is connected with a feedback pin of the voltage stabilizing chip through the feedback circuit.
Furthermore, the LC filter circuit comprises an inductor and two filter capacitors, one end of the inductor is connected with a voltage output pin of the voltage stabilizing chip, and the other end of the inductor is respectively connected with the two filter capacitors in series.
Furthermore, the feedback circuit comprises two series resistors, one end of each of the two series resistors is connected with the common end of the inductor and the two filter capacitors, the other end of each of the two series resistors is grounded, and the common end of each of the two series resistors is connected with the feedback pin of the voltage stabilizing chip.
Furthermore, the converter further comprises a first capacitor and a first diode, wherein the anode of the first diode is connected with the common end of the inductor and the two filter capacitors, the cathode of the first diode is connected with a voltage output pin of the voltage stabilizing chip through the first capacitor, and the common end of the first diode and the first capacitor is connected with a BST pin of the voltage stabilizing chip.
Furthermore, the converter also comprises a second diode, the cathode of the second diode is connected with the common end of the inductor and the voltage output pin of the voltage stabilizing chip, and the anode of the second diode is grounded.
Furthermore, the converter further comprises a first resistor, one end of the first resistor is connected with the direct-current voltage, and the other end of the first resistor is connected with an enabling end of the voltage stabilizing chip.
Furthermore, the converter further comprises a second capacitor, wherein one end of the second capacitor is connected with the voltage input pin of the voltage stabilizing chip, and the other end of the second capacitor is grounded.
Further, the voltage stabilizing chip is an LM2736XMK chip.
The DC-DC converter has the advantages that the output voltage after the input voltage is processed is stable through the voltage stabilizing chip 110, the LC filter circuit and the voltage stabilizing, filtering and overvoltage protection functions of the feedback circuit, and the DC-DC converter is small in electronic components and convenient to miniaturize and modularize.
Drawings
Fig. 1 is a circuit schematic of a DC-DC converter of one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in one embodiment, a DC-DC converter includes a voltage regulator chip 110, an LC filter circuit 120, and a feedback circuit 130. The voltage stabilizing chip 110 is an LM2736XMK chip. The voltage input pin VIN of the voltage regulator chip 110 is connected to the dc voltage, the voltage output pin SW is connected to the input terminal of the LC filter circuit 120, and the output terminal of the LC filter circuit 120 is connected to the feedback pin FB of the voltage regulator chip 110 through the feedback circuit 130.
In the present embodiment, the LC filter circuit 120 includes an inductor L and two filter capacitors C3 and C4, one end of the inductor L is connected to the voltage output pin SW of the voltage regulator chip 110, and the other end is connected in series with the two filter capacitors C3 and C4, respectively. The LC filter circuit 120 filters the voltage to reduce the ac component in the voltage, and keeps the dc component, and outputs the dc voltage stably. Specifically, the feedback circuit 130 includes two series resistors R2 and R3, one end of each of the two series resistors R2 and R3 is connected to the common end of the inductor L and the two filter capacitors C3 and C4, and the other end is grounded. The common end of the two series resistors R2 and R3 is connected with the feedback pin FB of the voltage stabilizing chip 110. When the voltage detected by the feedback pin FB is greater than the set first threshold, the voltage regulator chip 110 is turned off internally, thereby implementing overvoltage protection of the output voltage. The converter further comprises a first capacitor C1, a first diode D1 and a second diode D2, wherein the anode of the first diode D1 is connected with the inductor L and the common end of the two filter capacitors C3 and C4, and the cathode of the first diode D1 is connected with the voltage output pin SW of the voltage stabilizing chip 110 through a first capacitor C1. The common terminal of the first diode D1 and the first capacitor C1 is connected to the BST pin of the regulator chip 110. A first capacitor C1 is connected between the BST pin and the SW pin of the regulator chip 110, and functions as a bootstrap capacitor. The first diode D1 charges the first capacitor C1. The cathode of the second diode D2 is connected to the common terminal of the inductor L and the voltage output pin SW of the regulator chip 110, and the anode is grounded. A transmission path is provided for the current of the inductor L1 when the switch is open by the second diode D2.
In this embodiment, the converter further includes a first resistor R1 and a second capacitor C2, one end of the first resistor R1 is connected to the dc voltage, and the other end is connected to the enable terminal EN of the regulator chip 110. One end of the second capacitor C2 is connected to the voltage input pin VIN of the regulator chip 110, and the other end is grounded. The VIN pin and the EN pin of the voltage stabilization chip 110 are connected in series through the resistor R1, so that the EN pin keeps a high level and current input to the EN pin is reduced. The first capacitor C1 is used to handle the ripple current of the converter.
The DC-DC converter has the advantages that the output voltage after the input voltage is processed is stable through the voltage stabilizing chip 110, the LC filter circuit and the voltage stabilizing, filtering and overvoltage protection functions of the feedback circuit, and the DC-DC converter is small in electronic components and convenient to miniaturize and modularize.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A DC-DC converter is characterized by comprising a voltage stabilizing chip, an LC filter circuit and a feedback circuit, wherein a voltage input pin of the voltage stabilizing chip is connected with a direct-current voltage, a voltage output pin is connected with an input end of the LC filter circuit, and an output end of the LC filter circuit is connected with a feedback pin of the voltage stabilizing chip through the feedback circuit.
2. The DC-DC converter according to claim 1, wherein the LC filter circuit comprises an inductor and two filter capacitors, one end of the inductor is connected to the voltage output pin of the voltage stabilizing chip, and the other end of the inductor is connected in series with the two filter capacitors respectively.
3. The DC-DC converter according to claim 2, wherein the feedback circuit comprises two series resistors, one end of each series resistor is connected to a common end of the inductor and the two filter capacitors, the other end of each series resistor is connected to ground, and a common end of the two series resistors is connected to a feedback pin of the voltage stabilizing chip.
4. The DC-DC converter according to claim 3, further comprising a first capacitor and a first diode, wherein the anode of the first diode is connected to the common terminal of the inductor and the two filter capacitors, the cathode of the first diode is connected to the voltage output pin of the voltage regulator chip through the first capacitor, and the common terminal of the first diode and the first capacitor is connected to the BST pin of the voltage regulator chip.
5. The DC-DC converter according to claim 4, further comprising a second diode having a cathode connected to the common terminal of the inductor and the voltage output pin of the Zener chip and an anode connected to ground.
6. The DC-DC converter according to claim 1, further comprising a first resistor, wherein one end of the first resistor is connected to the DC voltage, and the other end of the first resistor is connected to an enable end of the voltage regulator chip.
7. The DC-DC converter according to claim 6, further comprising a second capacitor having one end connected to the voltage input pin of the regulator chip and the other end connected to ground.
8. The DC-DC converter according to claim 1, wherein the voltage stabilization chip is an LM2736XMK chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122457748.2U CN216252532U (en) | 2021-10-12 | 2021-10-12 | DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122457748.2U CN216252532U (en) | 2021-10-12 | 2021-10-12 | DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216252532U true CN216252532U (en) | 2022-04-08 |
Family
ID=80988255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122457748.2U Expired - Fee Related CN216252532U (en) | 2021-10-12 | 2021-10-12 | DC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216252532U (en) |
-
2021
- 2021-10-12 CN CN202122457748.2U patent/CN216252532U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220408 |