CN209462662U - A kind of series connection is always on power supply - Google Patents
A kind of series connection is always on power supply Download PDFInfo
- Publication number
- CN209462662U CN209462662U CN201822038246.4U CN201822038246U CN209462662U CN 209462662 U CN209462662 U CN 209462662U CN 201822038246 U CN201822038246 U CN 201822038246U CN 209462662 U CN209462662 U CN 209462662U
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- capacitor
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Abstract
The utility model provides a kind of connect and is always on power supply, belongs to power technique fields.It solves the problems, such as that existing switching power circuit is complex.This series connection is always on 2 end of the rectification circuit connection capacitor C1 anode of power supply, the positive input terminal of the one end resistance R1 and transformer U2, 4 end connect and grounds of capacitor C1 cathode and rectification circuit, another chip termination U1 pin 2 of resistance R1 and the one end capacitor C2, the other end of capacitor C2 is grounded, resistance R3 is connected on chip U1 pin 1, chip U1 pin 3 is grounded, resistance R2 is connected on chip U1 pin 4, chip U1 pin 7 and pin 8 are connect after connecting with the negative input end of above-mentioned transformer U2, the positive output end of transformer U2 is connect with the anode of diode D1, the cathode of diode D1 is connect with the anode of capacitor C3, the cathode of capacitor C3 and the negative output terminal connect and ground of transformer U2.This power supply has the advantages that circuit is simple, outputting current steadily.
Description
Technical field
The utility model belongs to power technique fields, is related to a kind of connect and is always on power supply.
Background technique
Switching Power Supply, switched-mode power supply (Switch Mode Power Supply, abbreviation SMPS), also known as switch type electricity
Source, switch converters are a kind of high frequency device for converting electric energy, are one kind of power supply unit.Its function is by a level
Voltage, be converted to the required voltage of user terminal or electric current through various forms of frameworks.The input of Switching Power Supply is mostly
AC power source (such as alternating current) or DC power supply, and exporting is to need the equipment of DC power supply mostly, such as PC, and
Switching Power Supply just carries out the conversion of voltage and current between the two.
With the continuous development of LED technology, the requirement to the Switching Power Supply being applied in LED light string is also higher and higher, but
Existing Switching Power Supply is generally complex, the switching power circuit being especially applied in LED light string.
Summary of the invention
Purpose of the utility model is to solve above-mentioned technical problems, propose a kind of connect and are always on power supply.
The purpose of this utility model can be realized by the following technical scheme: a kind of series connection is always on power supply, including rectified current
Road, chip U1 and transformer U2,1 end of rectification circuit and 3 ends are input terminal, and 2 ends are positive output end, and 4 ends are negative output terminal,
2 end connects the positive input terminal of capacitor C1 anode, the one end resistance R1 and above-mentioned transformer U2, the capacitor C1 cathode and rectification
4 end connect and grounds of circuit, another chip termination U1 pin 2 of the resistance R1 and the one end capacitor C2, the capacitor C2's is another
One end is grounded, and resistance R3, the other end ground connection of resistance R3 are connected on the chip U1 pin 1, and the chip U1 pin 3 connects
Ground is connected with resistance R2, the other end ground connection of the resistance R2, the chip U1 pin 7 and pin on the chip U1 pin 4
It being connect after 8 connections with the negative input end of above-mentioned transformer U2, the positive output end of transformer U2 is connect with the anode of diode D1, and two
The cathode of pole pipe D1 is connect with the anode of capacitor C3, the cathode of capacitor C3 and the negative output terminal connect and ground of transformer U2, institute
The negative output terminal of the negative pole end and transformer U2 of stating diode D1 is respectively used to connect with two input terminals of lamp string circuit.
It is always in power supply in a kind of above-mentioned series connection, the capacitor C1 and capacitor C3 are electrolytic capacitor.
It is always in power supply in a kind of above-mentioned series connection, pwm circuit and metal-oxide-semiconductor, the PWM is integrated in the chip U1
Circuit is for controlling the time ratio that metal-oxide-semiconductor turns on and off.
Compared with prior art, this series connection simple, outputting current steadily that is always on circuit construction of electric power.
Detailed description of the invention
Fig. 1 is the circuit diagram that this series connection is always on power supply.
Specific embodiment
It is specific embodiment of the utility model and in conjunction with attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these examples.
As shown in Figure 1, it includes rectification circuit, chip U1 and transformer U2,1 end of rectification circuit and 3 that this series connection, which is always on power supply,
End is input terminal, and 2 ends are positive output end, and 4 ends are negative output terminal, and 1 end and 3 ends of rectification circuit exchange with the external world be electrically connected respectively
It connects, the present embodiment rectification circuit is full bridge rectifier, and physical circuit figure is the prior art, as shown in Figure 1, herein no longer in detail
Thin narration.2 end of rectification circuit connects the positive input terminal of capacitor C1 anode, the one end resistance R1 and transformer U2, and capacitor C1 cathode connects
With 4 end connect and grounds of rectification circuit, another chip termination U1 pin 2 of resistance R1 and the one end capacitor C2, capacitor C2's is another
End is grounded, and resistance R3, the other end ground connection of resistance R3 are connected on chip U1 pin 1, and chip U1 pin 3 is grounded, and chip U1 draws
Resistance R2 is connected on foot 4, the other end of resistance R2 is grounded, defeated with bearing for transformer U2 after chip U1 pin 7 and the connection of pin 8
Enter end connection, the pin 5 and pin 6 of chip U1 is hanging.The positive output end of transformer U2 is connect with the anode of diode D1, two poles
The cathode of pipe D1 is connect with the anode of capacitor C3, and the negative pole end of diode D1 is the positive output end that entire series connection is always on power supply,
The cathode of capacitor C3 and the negative output terminal connect and ground of transformer U2, the negative output terminal of transformer U2 are that entire series connection is always on electricity
The negative output terminal in source, entirely the connect positive output end for being always on power supply and negative output terminal are as the input terminal for supplying electricity to lamp string circuit.
Capacitor C1 in the present embodiment is electrolytic capacitor, is 400V/4.7UF, and capacitor C3 is also electrolytic capacitor, is 50V/
22UF, the resistance value of resistance R1, R2 and R3 are 1M, 20K and 2K respectively, and capacitor C2 is 10UF.Be integrated in chip U1 pwm circuit and
Metal-oxide-semiconductor, pwm circuit are pulse width modulation circuit, and pulse width modulation is the numeral output using microprocessor come to simulation
A kind of very effective technology that circuit is controlled is widely used in many from measurement, communication to power control and transformation
In field.Pulse width modulation is a kind of analog control mode, according to the variation of respective loads come modulation transistor base stage or
The biasing of metal-oxide-semiconductor grid, the change of Lai Shixian transistor or metal-oxide-semiconductor turn-on time, to realize switching power supply output
Change.This mode can be such that the output voltage of power supply keeps constant in operation conditions change, be the number using microprocessor
A kind of very effective technology that signal controls analog circuit.Pwm circuit is the prior art, is no longer discussed in detail.
Working principle is as follows: after alternating current input, rectification circuit first rectifies alternating current, then passes through electrolytic capacitor
C1 is filtered, capacitor C2 bootrom U1 work, and the PWM in chip U1 carries out the time ratio that metal-oxide-semiconductor turns on and off
Control, when metal-oxide-semiconductor is opened, voltage value needed for transformer U2 carries out decompression processing output lamp string circuit makes for lamp string circuit
With.Since PWM and metal-oxide-semiconductor are integrated in chip U1, integrated circuit is simplified, and circuit is simple, at low cost, and laying side
Just.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Claims (3)
1. a kind of series connection is always on power supply, including rectification circuit, chip U1 and transformer U2,1 end of rectification circuit and 3 ends are defeated
Enter end, 2 ends are positive output end, and 4 ends are negative output terminal, the 2 end connection capacitor C1 anode, the one end resistance R1 and above-mentioned transformer
4 end connect and grounds of the positive input terminal of U2, the capacitor C1 cathode and rectification circuit, another chip termination U1 of resistance R1
The other end of pin 2 and the one end capacitor C2, the capacitor C2 is grounded, and is connected with resistance R3, resistance R3 on the chip U1 pin 1
Other end ground connection, the chip U1 pin 3 is grounded, and is connected with resistance R2 on the chip U1 pin 4, the resistance R2's is another
One end ground connection, the chip U1 pin 7 and pin 8 are connect after connecting with the negative input end of above-mentioned transformer U2, transformer U2's
The anode of positive output end and diode D1 connects, and the cathode of diode D1 is connect with the positive of capacitor C3, the cathode of capacitor C3 and
The negative output terminal connect and ground of transformer U2, the negative pole end of the diode D1 and the negative output terminal of transformer U2 are respectively used to
It is connect with two input terminals of lamp string circuit.
2. a kind of series connection according to claim 1 is always on power supply, which is characterized in that the capacitor C1 and capacitor C3 be
Electrolytic capacitor.
3. a kind of series connection according to claim 1 or 2 is always on power supply, which is characterized in that be integrated in the chip U1
Pwm circuit and metal-oxide-semiconductor, the pwm circuit is for controlling the time ratio that metal-oxide-semiconductor turns on and off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822038246.4U CN209462662U (en) | 2018-12-06 | 2018-12-06 | A kind of series connection is always on power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822038246.4U CN209462662U (en) | 2018-12-06 | 2018-12-06 | A kind of series connection is always on power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209462662U true CN209462662U (en) | 2019-10-01 |
Family
ID=68038873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822038246.4U Expired - Fee Related CN209462662U (en) | 2018-12-06 | 2018-12-06 | A kind of series connection is always on power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209462662U (en) |
-
2018
- 2018-12-06 CN CN201822038246.4U patent/CN209462662U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191001 Termination date: 20211206 |