CN219477840U - DC-DC adapter low-voltage input starting circuit - Google Patents
DC-DC adapter low-voltage input starting circuit Download PDFInfo
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- CN219477840U CN219477840U CN202320512816.7U CN202320512816U CN219477840U CN 219477840 U CN219477840 U CN 219477840U CN 202320512816 U CN202320512816 U CN 202320512816U CN 219477840 U CN219477840 U CN 219477840U
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- resistor
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- voltage input
- input circuit
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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 utility model provides a DC-DC adapter low-voltage input starting circuit, which comprises: a low voltage input circuit and a high voltage input circuit connected to each other; the low voltage input circuit includes: one end of the second resistor is connected with the power supply voltage, the other end of the second resistor is connected with the high-voltage input circuit, the emitting electrode of the second triode, one end of the sixth resistor, one end of the fifth resistor and the emitting electrode of the third triode, the collecting electrode of the second triode is connected with the high-voltage input circuit, the base electrode of the second triode is connected with the other end of the sixth resistor, one end of the third resistor and the collecting electrode of the third triode respectively, the base electrode of the third triode is connected with the other end of the fifth resistor and one end of the fourth resistor respectively, the other end of the fourth resistor is connected with one end of the first shunt regulator, and the other end of the third resistor and the other end of the first shunt regulator are grounded. The utility model solves the problems that the adapter in the prior art has small voltage input and cannot be started.
Description
Technical Field
The utility model relates to the technical field of electronic elements, in particular to a low-voltage input starting circuit of a DC-DC adapter.
Background
At present, aiming at a common DC-DC adapter, the input voltage range is 11V-36 VDC, but in a special application scene, when the input voltage is 7V-9 VDC, the common adapter cannot be started for use at the moment, and the adapter in the prior art has the problems of small voltage input and incapability of starting the adapter.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a low-voltage input starting circuit of a DC-DC adapter, and solves the problems that the adapter in the prior art has small voltage input and cannot be started.
In order to achieve the above object, the present utility model provides the following solutions:
a DC-DC adapter low voltage input start-up circuit comprising:
a low voltage input circuit and a high voltage input circuit connected to each other;
the low voltage input circuit includes:
the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the second triode, the third triode and the first shunt regulator;
one end of the second resistor is connected with a power supply voltage, the other end of the second resistor is connected with the high-voltage input circuit, the emitter of the second triode, one end of the sixth resistor, one end of the fifth resistor and the emitter of the third triode are connected, the collector of the second triode is connected with the high-voltage input circuit, the base of the second triode is respectively connected with the other end of the sixth resistor, one end of the third resistor and the collector of the third triode, the base of the third triode is respectively connected with the other end of the fifth resistor and one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the first shunt regulator, and the other end of the third resistor and the other end of the first shunt regulator are grounded.
Preferably, the high voltage input circuit includes:
the first resistor, the first triode and the second shunt regulator; one end of the first resistor and the collector electrode of the first triode are connected with the other end of the second resistor, the other end of the first resistor is connected with the base electrode of the first triode and the second shunt regulator respectively, the emitter electrode of the first triode is connected with the collector electrode of the second triode, and the other end of the second shunt regulator is grounded.
Preferably, the operating voltage range of the high voltage input circuit is: 11V-36V.
Preferably, the operating voltage range of the low voltage input circuit is: 7V-9V.
Preferably, if the input voltage range is 7V-9V, the base voltage of the second triode is smaller than the collector voltage.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the utility model provides a low-voltage input starting circuit of a DC-DC adapter, which is characterized in that a starting terminal voltage is directly obtained through a second triode when the input voltage range is 7-9v by arranging a low-voltage input circuit.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a low voltage input start circuit of a DC-DC adapter according to an embodiment of the present utility model.
Reference numerals illustrate:
r1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, Q1-first triode, Q2-second triode, Q3-third triode, ZD 1-first shunt regulator, ZD 2-second shunt regulator, VIN-input end and VCC-starting end.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims of this application and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, inclusion of a list of steps, processes, methods, etc. is not limited to the listed steps but may alternatively include steps not listed or may alternatively include other steps inherent to such processes, methods, products, or apparatus.
The utility model aims to provide a low-voltage input starting circuit of a DC-DC adapter, which solves the problem that the adapter in the prior art has small voltage input and cannot be started.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the present utility model provides a DC-DC adapter low voltage input start-up circuit, comprising:
a low voltage input circuit and a high voltage input circuit connected to each other;
the low voltage input circuit includes:
the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the second triode Q2, the third triode Q3 and the first shunt regulator ZD1;
one end of the second resistor R2 is connected with a power supply voltage, the other end of the second resistor R2 is connected with the high-voltage input circuit, the emitter of the second triode Q2, one end of the sixth resistor R6, one end of the fifth resistor R5 and the emitter of the third triode Q3 are connected, the collector of the second triode Q2 is connected with the high-voltage input circuit, the base of the second triode Q2 is respectively connected with the other end of the sixth resistor R6, one end of the third resistor R3 and the collector of the third triode Q3, the base of the third triode Q3 is respectively connected with the other end of the fifth resistor R5 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with one end of the first shunt regulator ZD1, and the other end of the third resistor R3 and the other end of the first shunt regulator ZD1 are both grounded.
Specifically, the connection mode of the second triode Q2 and the first triode Q1 is parallel connection.
Further, the high voltage input circuit includes:
a first resistor R1, a first triode Q1 and a second shunt regulator ZD2; one end of the first resistor R1 and the collector of the first triode Q1 are both connected with the other end of the second resistor R2, the other end of the first resistor R1 is respectively connected with the base of the first triode Q1 and the second shunt regulator ZD2, the emitter of the first triode Q1 is connected with the collector of the second triode Q2, and the other end of the second shunt regulator ZD2 is grounded.
Further, the working voltage range of the high-voltage input circuit is as follows: 11V-36V. When the DC-DC input voltage is above 11VDC, the working path of the starting end vcc is a first resistor R1, a first triode Q1 and a second shunt regulator ZD2;
specifically, the working voltage range of the low-voltage input circuit is as follows: 7V-9V.
Further, if the input voltage range is 7V-9V, the base voltage of the second triode Q2 is smaller than the collector voltage. The voltage at the start-up terminal vcc is directly obtained through the second transistor Q2. Therefore, the voltage of the starting end vcc is equal to the input end vin, so that the voltage of the starting end vcc is not reduced and lowered, and the starting end vcc is ensured to be 7V-9V, and the adapter can be started normally.
The beneficial effects of the utility model are as follows:
the utility model provides a low-voltage input starting circuit of a DC-DC adapter, which is characterized in that a starting terminal voltage is directly obtained through a second triode when the input voltage range is 7-9v by arranging a low-voltage input circuit.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present utility model and the core ideas thereof; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (5)
1. A DC-DC adapter low voltage input start-up circuit, comprising:
a low voltage input circuit and a high voltage input circuit connected to each other;
the low voltage input circuit includes:
the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the second triode, the third triode and the first shunt regulator;
one end of the second resistor is connected with a power supply voltage, the other end of the second resistor is connected with the high-voltage input circuit, the emitter of the second triode, one end of the sixth resistor, one end of the fifth resistor and the emitter of the third triode are connected, the collector of the second triode is connected with the high-voltage input circuit, the base of the second triode is respectively connected with the other end of the sixth resistor, one end of the third resistor and the collector of the third triode, the base of the third triode is respectively connected with the other end of the fifth resistor and one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the first shunt regulator, and the other end of the third resistor and the other end of the first shunt regulator are grounded.
2. A DC-DC adapter low voltage input start-up circuit as recited in claim 1, wherein the high voltage input circuit comprises:
the first resistor, the first triode and the second shunt regulator; one end of the first resistor and the collector electrode of the first triode are connected with the other end of the second resistor, the other end of the first resistor is connected with the base electrode of the first triode and the second shunt regulator respectively, the emitter electrode of the first triode is connected with the collector electrode of the second triode, and the other end of the second shunt regulator is grounded.
3. A DC-DC adapter low voltage input start-up circuit according to claim 1, wherein the operating voltage range of the high voltage input circuit is: 11V-36V.
4. A DC-DC adapter low voltage input start-up circuit according to claim 1, wherein the operating voltage range of the low voltage input circuit is: 7V-9V.
5. The DC-DC adapter low voltage input start-up circuit of claim 4, wherein the base voltage of the second transistor is less than the collector voltage if the input voltage is in the range of 7V-9V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320512816.7U CN219477840U (en) | 2023-03-16 | 2023-03-16 | DC-DC adapter low-voltage input starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320512816.7U CN219477840U (en) | 2023-03-16 | 2023-03-16 | DC-DC adapter low-voltage input starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219477840U true CN219477840U (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320512816.7U Active CN219477840U (en) | 2023-03-16 | 2023-03-16 | DC-DC adapter low-voltage input starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219477840U (en) |
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2023
- 2023-03-16 CN CN202320512816.7U patent/CN219477840U/en active Active
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