CN218829128U - Power supply circuit capable of automatically switching - Google Patents
Power supply circuit capable of automatically switching Download PDFInfo
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- CN218829128U CN218829128U CN202223279427.9U CN202223279427U CN218829128U CN 218829128 U CN218829128 U CN 218829128U CN 202223279427 U CN202223279427 U CN 202223279427U CN 218829128 U CN218829128 U CN 218829128U
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- control circuit
- power supply
- circuit
- ldo
- mcu control
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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 discloses a power supply circuit capable of automatic switching, which comprises a power supply main circuit, an LDO power supply & control circuit, a linear voltage stabilizing circuit and an MCU control circuit; the input end of the main power supply circuit is connected to the commercial power, and the output end of the main power supply circuit is connected to the load; the first end of the linear voltage stabilizing circuit is connected to the VCCS end of the power supply main circuit, and the second end of the linear voltage stabilizing circuit is connected to the VCC end of the MCU control circuit; the first end of the LDO power supply and control circuit is connected with the VCCS end of the power main circuit, the second end of the LDO power supply and control circuit is connected with the VCC end of the MCU control circuit, and the third end of the LDO power supply and control circuit is connected with the SDT end of the MCU control circuit; the MCU control circuit can be powered by the LDO power supply and control circuit during normal work and is switched to be powered by the linear voltage stabilizing circuit when the MCU control circuit enters a standby state; by the aid of the circuit, the MCU control circuit can be powered by the high-precision and stable LDO power supply and control circuit when the MCU control circuit works normally, and the linear voltage stabilizing circuit with low power consumption is used for supplying power when the MCU control circuit enters a standby state, so that standby power consumption of the power supply can be reduced.
Description
Technical Field
The utility model relates to a power supply circuit and controller field, in particular to but automatic switch-over's power supply circuit.
Background
Along with the popularization of LED lamps, the diversification of LED power supplies also appears, various dimming modes are also in a large number, and intelligent dimming is the most used and the most widely used in the market at present; the intelligent dimming is mostly controlled by a single chip microcomputer, and all states of the single chip microcomputer (except for shutdown) are required to be kept working (power supply state) to meet the requirements of a dimming system.
At present, the LDO three-terminal voltage stabilizing circuit is basically adopted for supplying power to the singlechip, and the circuit has the advantages that high-precision stable voltage can be output, and stable power supply voltage and PWM dimming control signals with stable amplitude are provided for the singlechip; however, the requirement of a certain voltage difference between the input and the output is required, so that the conversion efficiency is relatively low, the power consumption of the system after the system enters the standby mode is increased, and the requirement on the power supply quality after the system enters the standby mode is not high as long as the voltage and the current in the working voltage range can be provided for the single chip microcomputer; therefore, there is a need for an auto-switching power supply circuit to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a but automatic switch-over's supply circuit.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: a power supply circuit capable of automatically switching comprises a power supply main circuit, an LDO power supply and control circuit, a linear voltage stabilizing circuit and an MCU control circuit;
the input end of the main power supply circuit is connected to the commercial power, and the output end of the main power supply circuit is connected to the load;
the first end of the linear voltage stabilizing circuit is connected to the VCCS end of the power supply main circuit, and the second end of the linear voltage stabilizing circuit is connected to the VCC end of the MCU control circuit;
the first end of the LDO power supply and control circuit is connected with the VCCS end of the power main circuit, the second end of the LDO power supply and control circuit is connected with the VCC end of the MCU control circuit, and the third end of the LDO power supply and control circuit is connected with the SDT end of the MCU control circuit;
the MCU control circuit can be powered by the LDO power supply & control circuit during normal work and is switched to be powered by the linear voltage stabilizing circuit when the MCU control circuit enters standby.
Further, the linear voltage stabilizing circuit comprises a triode Q1, a resistor R1 and a voltage stabilizing diode ZD1, wherein a collector of the triode Q1 is respectively connected with a VCCS end of the power supply main circuit and one end of the resistor R1, the other end of the resistor R1 is connected with a base of the triode Q1 and is connected with a GNS end of the power supply main circuit through the voltage stabilizing diode ZD1, and an emitter of the triode Q1 is connected with a VCC end of the MCU control circuit.
Further, the LDO power supply & control circuit includes MOS transistor Q2, triode Q3, resistor R2-3, electric capacity C1 and LDO, the source electrode of MOS transistor Q2 is connected with the VCCS end of power main circuit and the one end of resistor R2 respectively, the other end of resistor R2 is connected with the grid of MOS transistor Q2 and the collector of triode Q3 respectively, the drain electrode of MOS transistor Q2 is connected with the input of LDO, the output of LDO is connected with the VCC end of MCU control circuit, the base electrode of triode Q3 is connected with the one end of resistor R3, the one end of electric capacity C1 and the SDT end of MCU control circuit respectively, the projecting pole of triode Q3, the other end of resistor R3, the other end of electric capacity C1 and the earthing terminal of LDO are connected in the GNS end of power main circuit.
The utility model has the advantages that: a power supply circuit capable of automatically switching comprises a power supply main circuit, an LDO power supply and control circuit, a linear voltage stabilizing circuit and an MCU control circuit; the input end of the main power supply circuit is connected to the commercial power, and the output end of the main power supply circuit is connected to the load; the first end of the linear voltage stabilizing circuit is connected to the VCCS end of the power supply main circuit, and the second end of the linear voltage stabilizing circuit is connected to the VCC end of the MCU control circuit; the first end of the LDO power supply and control circuit is connected with the VCCS end of the power main circuit, the second end of the LDO power supply and control circuit is connected with the VCC end of the MCU control circuit, and the third end of the LDO power supply and control circuit is connected with the SDT end of the MCU control circuit; the MCU control circuit can be powered by the LDO power supply and control circuit during normal work and is switched to be powered by the linear voltage stabilizing circuit when the MCU control circuit enters standby; by the aid of the circuit, the MCU control circuit can be powered by the high-precision and stable LDO power supply and control circuit when the MCU control circuit works normally, and the linear voltage stabilizing circuit with low power consumption is used for supplying power when the MCU control circuit enters a standby state, so that standby power consumption of the power supply can be reduced.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a functional block diagram of an automatically switchable power supply circuit;
fig. 2 is a circuit diagram of an automatically switchable power supply circuit.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either internal to the two elements or in an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1 to 2, an auto-switchable power supply circuit includes a power main circuit 10, an LDO power supply & control circuit 20, a linear voltage stabilizing circuit 30, and an MCU control circuit 40;
the input end of the main power circuit 10 is connected to the commercial power, and the output end is connected to the load;
the first end of the linear voltage stabilizing circuit 30 is connected to the VCCS end of the power main circuit 10, and the second end is connected to the VCC end of the MCU control circuit 40;
the first end of the LDO power supply & control circuit 20 is connected to the VCCS end of the power main circuit 10, the second end is connected to the VCC end of the MCU control circuit 40, and the third end is connected to the SDT end of the MCU control circuit 40;
the MCU control circuit 40 can be powered by the LDO power & control circuit 20 during normal operation and switched to be powered by the linear voltage regulator circuit 30 when standby is entered.
The linear voltage stabilizing circuit 30 comprises a triode Q1, a resistor R1 and a zener diode ZD1, wherein a collector of the triode Q1 is connected with a VCCS end of the power supply main circuit 10 and one end of the resistor R1 respectively, the other end of the resistor R1 is connected with a base of the triode Q1 and is connected with a GNS end of the power supply main circuit 10 through the zener diode ZD1, and an emitter of the triode Q1 is connected with a VCC end of the MCU control circuit 40.
The LDO power supply & control circuit 20 includes a MOS transistor Q2, a triode Q3, a resistor R2-3, a capacitor C1 and an LDO, the source of the MOS transistor Q2 is connected to the VCCS end of the power main circuit 10 and one end of the resistor R2, the other end of the resistor R2 is connected to the gate of the MOS transistor Q2 and the collector of the triode Q3, the drain of the MOS transistor Q2 is connected to the input of the LDO, the output of the LDO is connected to the VCC end of the MCU control circuit 40, the base of the triode Q3 is connected to one end of the resistor R3, one end of the capacitor C1 and the SDT end of the MCU control circuit 40, the emitter of the triode Q3, the other end of the resistor R3, the other end of the capacitor C1 and the ground end of the LDO are connected to the GNS end of the power main circuit 10.
The utility model discloses a theory of operation as follows: as shown in fig. 2, when the system enters a standby state, the MCU control circuit 40 sends an instruction through the STD, the transistor Q3 stops working, the resistor R2 raises the gate voltage of the MOS transistor Q2, the MOS transistor Q2 stops working, no voltage enters the input terminal of the LDO, no voltage is output from the output terminal of the LDO, and thus the LDO stops supplying power to the MCU control circuit 40; meanwhile, the first resistor R1 supplies voltage to the base electrode of the triode Q1 through voltage division, the voltage stabilizing diode ZD1 stabilizes the voltage at a certain value, and the triode Q1 works at the moment to supply power to the MCU control circuit 40; the current flowing into the MCU control circuit 40 can be adjusted by adjusting the resistance value of the resistor R1, so that the loss of the MCU control circuit 40 is minimized when the MCU control circuit is in standby, and the standby power consumption of the whole machine is reduced.
The utility model discloses the advantage of implementing lies in: after the system is in standby, the LDO power supply & control circuit 20 is disconnected, the linear voltage stabilizing circuit 30 supplies power to the MCU control circuit 40, and the linear voltage stabilizing circuit 30 only needs to ensure that the MCU control circuit 40 can work without large current, so that the power consumption of the MCU control circuit 40 in standby at ordinary times is reduced, and lower standby power consumption is achieved.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (3)
1. An automatically switchable power supply circuit, characterized by: the LDO power supply and control circuit comprises a power supply main circuit (10), an LDO power supply and control circuit (20), a linear voltage stabilizing circuit (30) and an MCU control circuit (40);
the input end of the power supply main circuit (10) is connected to commercial power, and the output end of the power supply main circuit is connected to a load;
the first end of the linear voltage stabilizing circuit (30) is connected to the VCCS end of the power supply main circuit (10), and the second end of the linear voltage stabilizing circuit is connected to the VCC end of the MCU control circuit (40);
the first end of the LDO power supply & control circuit (20) is connected to the VCCS end of the power main circuit (10), the second end of the LDO power supply & control circuit is connected to the VCC end of the MCU control circuit (40), and the third end of the LDO power supply & control circuit is connected to the SDT end of the MCU control circuit (40);
the MCU control circuit (40) can be powered by the LDO power supply & control circuit (20) in normal operation and is switched to be powered by the linear voltage stabilizing circuit (30) when the standby state is started.
2. An automatically switchable power supply circuit according to claim 1, characterized in that: the linear voltage stabilizing circuit (30) comprises a triode Q1, a resistor R1 and a voltage stabilizing diode ZD1, wherein a collector of the triode Q1 is respectively connected with a VCCS end of the power main circuit (10) and one end of the resistor R1, the other end of the resistor R1 is connected with a base of the triode Q1 and is connected with a GNS end of the power main circuit (10) through the voltage stabilizing diode ZD1, and an emitter of the triode Q1 is connected with a VCC end of the MCU control circuit (40).
3. An automatically switchable power supply circuit according to claim 1, characterized in that: the LDO power supply & control circuit (20) comprises an MOS tube Q2, a triode Q3, a resistor R2-3, a capacitor C1 and an LDO, the source electrode of the MOS tube Q2 is respectively connected with the VCCS end of the power main circuit (10) and one end of the resistor R2, the other end of the resistor R2 is respectively connected with the grid electrode of the MOS tube Q2 and the collector electrode of the triode Q3, the drain electrode of the MOS tube Q2 is connected with the input end of the LDO, the output end of the LDO is connected with the VCC end of the MCU control circuit (40), the base electrode of the triode Q3 is respectively connected with one end of the resistor R3, one end of the capacitor C1 and the SDT end of the MCU control circuit (40), and the emitter electrode of the triode Q3, the other end of the resistor R3, the other end of the capacitor C1 and the grounding end of the LDO are connected with the GNS end of the power main circuit (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223279427.9U CN218829128U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit capable of automatically switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223279427.9U CN218829128U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit capable of automatically switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218829128U true CN218829128U (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223279427.9U Active CN218829128U (en) | 2022-12-06 | 2022-12-06 | Power supply circuit capable of automatically switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218829128U (en) |
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2022
- 2022-12-06 CN CN202223279427.9U patent/CN218829128U/en active Active
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