CN204425198U - A kind of power-supplying circuit - Google Patents
A kind of power-supplying circuit Download PDFInfo
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- CN204425198U CN204425198U CN201520101327.8U CN201520101327U CN204425198U CN 204425198 U CN204425198 U CN 204425198U CN 201520101327 U CN201520101327 U CN 201520101327U CN 204425198 U CN204425198 U CN 204425198U
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Abstract
The utility model embodiment provides a kind of power-supplying circuit, comprises EMI filter circuit and rectification circuit, starts power circuit, auxiliary power circuit and anti exciting converter power circuit; The input of described auxiliary power circuit and described anti exciting converter power circuit is connected to the output of described rectification circuit simultaneously, adopt startup power circuit to power when described accessory power supply power supply circuits start, when flyback variator power circuit works, disconnect and start power-supplying circuit.Power consumption after adopting this programme effectively can reduce power initiation.
Description
Technical field
The application relates to electronic technology field, particularly a kind of power-supplying circuit.
Background technology
By powering to after AC rectification circuit to be powered in prior art, often only have a road to export in this case, output voltage comparatively conference causes power consumption to rise.
Summary of the invention
In view of this, the utility model embodiment provides a kind of power-supplying circuit, effectively can reduce the power consumption after power initiation.
The utility model embodiment is achieved in that a kind of power-supplying circuit, comprises EMI filter circuit and rectification circuit, starts power circuit, auxiliary power circuit and anti exciting converter power circuit; The input of described auxiliary power circuit and described anti exciting converter power circuit is connected to the output of described rectification circuit simultaneously, adopt startup power circuit to power when described accessory power supply power supply circuits start, when flyback variator power circuit works, disconnect and start power-supplying circuit.
Further, described anti exciting converter power circuit comprises a buffer circuit and transformer further, the input of described buffer circuit is connected with described second DC output circuit, the output of described buffer circuit is connected with the primary side of described transformer, and the secondary side of described transformer is connected with the power input of circuit to be powered.
Further, described startup power circuit comprises the first resistor group, the first voltage-stabiliser tube group and the first resistance, and described first resistor group and the rear ground connection of the first voltage-stabiliser tube group series connection, one end of the first resistance is connected in described first and exports in DC circuit.
Further, described anti exciting converter power supply also comprises the second resistance, 3rd resistance, first triode, first metal-oxide-semiconductor, the drain electrode of described first metal-oxide-semiconductor is connected with the other end of the first resistance, the grid of described first metal-oxide-semiconductor is connected to the negative level of described first last voltage-stabiliser tube of voltage-stabiliser tube group, and be connected with the collector electrode of described first triode, described second resistance and the 3rd resistance are used for making the first triode ON, described second resistance and the 3rd resistant series, the base stage of described first triode is connected between described second resistance and the 3rd resistance, ground connection after the other end of described second resistance is connected with the emitter of described first triode, the source electrode of described first metal-oxide-semiconductor is connected with the power input of circuit to be powered.
Further, also to connect between the collector electrode of described first triode and the grid of described first metal-oxide-semiconductor a diode.
Further, the ratio of described second resistance and the 3rd resistance meets the base voltage of Q when secondary winding is powered and is greater than its conduction voltage drop 0.7V.
Further, described circuit to be powered is a pulsewidth modulated intergrated circuit.
Further, the supply power voltage of described pulsewidth modulated intergrated circuit is 16 ~ 36V.
Further, described second resistance is 2K Ω, and the 3rd resistance is 40K Ω.
Adopt technique scheme: use auxiliary winding terminal to power to IC, excised by the startup power supply of high power consumption after circuit start completes, reduce the loss of power.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, the other features, objects and advantages of the application will become more obvious:
Fig. 1 shows the circuit diagram of the power-supplying circuit that the application provides.
Embodiment
Below in conjunction with drawings and Examples, the application is described in further detail.Be understandable that, specific embodiment described herein is only for explaining relevant utility model, but not the restriction to this utility model.It also should be noted that, for convenience of description, in accompanying drawing, illustrate only the part relevant with relevant utility model.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the application in detail in conjunction with the embodiments.
As shown in Figure 1, be the power-supplying circuit that the utility model provides, comprise EMI filter circuit and rectification circuit, start power circuit, auxiliary power circuit and anti exciting converter power circuit; The input of described auxiliary power circuit and described anti exciting converter power circuit is connected to the output of described rectification circuit simultaneously, adopt startup power circuit to power when described accessory power supply power supply circuits start, when flyback variator power circuit works, disconnect accessory power supply power supply circuits.
Above-mentioned EMI filter circuit is existing filtering technique, usual alternating current is after the electromagnetic interface filter be made up of high-frequency bypass capacitor CY1, CY2 and common mode choke induction LF1, export direct current after having filtered out noise supply rectifier bridge BD1 rectification wherein, the direct current obtained after simple rectification divides two-way.
Furthermore, anti exciting converter power circuit comprises a buffer circuit and transformer T1 further, buffer circuit is made up of resistance R8, electric capacity C3 and diode D1, the input of described buffer circuit is connected with described second DC output circuit, the output of described buffer circuit is connected with the primary side of described transformer, and the secondary side of described transformer is connected with the power input PIN7 of circuit U C3842 to be powered.
Further, described startup power circuit comprises the first resistor group (being made up of R110 ~ R116), the first voltage-stabiliser tube group (being made up of Z1 ~ Z4) and the first resistance R107, described first resistor group and the rear ground connection of the first voltage-stabiliser tube group series connection, one end of the first resistance is connected in described first and exports in DC circuit.
Further, described anti exciting converter power circuit also comprises the second resistance R108, 3rd resistance R109, first triode Q, first metal-oxide-semiconductor Q10, the drain electrode of described first metal-oxide-semiconductor is connected with the other end of the first resistance, the grid of described first metal-oxide-semiconductor is connected to the negative level of described first last voltage-stabiliser tube of voltage-stabiliser tube group, and be connected with the collector electrode of described first triode, described second resistance and the 3rd resistance are used for making the first triode ON, described second resistance and the 3rd resistant series, the base stage of described first triode is connected between described second resistance and the 3rd resistance, ground connection after the other end of described second resistance is connected with the emitter of described first triode, the source electrode of described first metal-oxide-semiconductor is connected with the power input of circuit to be powered.
Further, also connect between the collector electrode of described first triode and the grid of described first metal-oxide-semiconductor a diode D10.
Physical circuit analytic process is as follows:
Alternating current is after the electromagnetic interface filter be made up of high-frequency bypass capacitor CY1, CY2 and common mode choke induction LF1, filter out noise supply rectifier bridge BD1 rectification wherein, the direct current obtained after simple rectification divides two-way, one tunnel is after R110 ~ R116, being exported by Z1 ~ Z4 voltage stabilizing makes field effect transistor Q10 grid potential for high, make its conducting, make rectifier obtain direct current and provide starting resistor by resistance R107 to pulse width modulating chip UC3842.Because rectifier output voltage is very high when adopting this road to power, make the power consumption of R107 very large.
Transformer T1 primary side is flowed through through another road of electric current of rectifier bridge BD1 rectification, power to UC3842 because electromagnetic induction makes the Same Name of Ends of the secondary side winding be connected with 7 pins of UC3842 export forward voltage, now, suitable R108 and R109 is set and can makes triode Q conducting, Q10 is turned off by D10 ground connection because of grid, thus the high power consumption be made up of R107 and Q10 is started power supply excision, turn and powered to UC3842 by Circuit Fault on Secondary Transformer winding power supply, reduce power supply power consumption.
Choosing of resistance R108 and R109 should meet following two conditions:
Can not be too small, make the electric current flowing through triode Q in its allowed band;
Ratio wants appropriate, should meet the base voltage of Q when secondary winding is powered and be greater than its conduction voltage drop 0.7V.
Circuit U C3842 normal working voltage to be powered, at 16V ~ 36V, based on above two conditions, chooses R108=2K, R109=40K.When powering to other IC, according to the supply power voltage requirement of IC, choose suitable R108, R109 with said method.
More than describe and be only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art are to be understood that, utility model scope involved in the application, be not limited to the technical scheme of the particular combination of above-mentioned technical characteristic, also should be encompassed in when not departing from the design of described utility model, other technical scheme of being carried out combination in any by above-mentioned technical characteristic or its equivalent feature and being formed simultaneously.Such as, disclosed in above-mentioned feature and the application but be not limited to) technical characteristic with similar functions replaces mutually and the technical scheme formed.
Claims (9)
1. a power-supplying circuit, comprises EMI filter circuit and rectification circuit, it is characterized in that, also comprises and starts power circuit, auxiliary power circuit and anti exciting converter power circuit; The input of described auxiliary power circuit and described anti exciting converter power circuit is connected to the output of described rectification circuit simultaneously, adopt startup power circuit to power when described accessory power supply power supply circuits start, when flyback variator power circuit works, disconnect and start power-supplying circuit.
2. power-supplying circuit according to claim 1, it is characterized in that, described anti exciting converter power supply comprises a buffer circuit and transformer further, the input of described buffer circuit is connected with described startup power circuit, the output of described buffer circuit is connected with the primary side of described transformer, and the secondary side of described transformer is connected with the power input of circuit to be powered.
3. power-supplying circuit according to claim 1, is characterized in that, described startup power circuit comprises the first resistor group, the first voltage-stabiliser tube group and the first resistance, described first resistor group and the rear ground connection of the first voltage-stabiliser tube group series connection.
4. power-supplying circuit according to claim 3, it is characterized in that, described auxiliary power circuit also comprises the second resistance, 3rd resistance, first triode, first metal-oxide-semiconductor, the drain electrode of described first metal-oxide-semiconductor is connected with the other end of the first resistance, the grid of described first metal-oxide-semiconductor is connected to the negative level of described first last voltage-stabiliser tube of voltage-stabiliser tube group, and be connected with the collector electrode of described first triode, described second resistance and the 3rd resistance are used for making the first triode ON, described second resistance and the 3rd resistant series, the base stage of described first triode is connected between described second resistance and the 3rd resistance, ground connection after the other end of described second resistance is connected with the emitter of described first triode, the source electrode of described first metal-oxide-semiconductor is connected with the power input of circuit to be powered.
5. power-supplying circuit according to claim 4, is characterized in that, a diode of also connecting between the collector electrode of described first triode and the grid of described first metal-oxide-semiconductor.
6. power-supplying circuit according to claim 4, is characterized in that, the ratio of described second resistance and the 3rd resistance meets the base voltage of Q when secondary winding is powered and is greater than its conduction voltage drop 0.7V.
7., according to the arbitrary described power-supplying circuit of claim 2 ~ 5, it is characterized in that, described circuit to be powered is a pulsewidth modulated intergrated circuit.
8. power-supplying circuit according to claim 7, is characterized in that, the supply power voltage of described pulsewidth modulated intergrated circuit is 16 ~ 36V.
9. power-supplying circuit according to claim 8, is characterized in that, described second resistance is 2K Ω, and the 3rd resistance is 40K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520101327.8U CN204425198U (en) | 2015-02-12 | 2015-02-12 | A kind of power-supplying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520101327.8U CN204425198U (en) | 2015-02-12 | 2015-02-12 | A kind of power-supplying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204425198U true CN204425198U (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520101327.8U Expired - Fee Related CN204425198U (en) | 2015-02-12 | 2015-02-12 | A kind of power-supplying circuit |
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| CN (1) | CN204425198U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323925A (en) * | 2015-11-04 | 2016-02-10 | 浙江榆阳电子有限公司 | Power supply quick starting circuit |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| CN110048587A (en) * | 2019-05-14 | 2019-07-23 | 安徽亚辉电气自动化有限公司 | A kind of supply harmonic suppressor with buffer protection circuit |
-
2015
- 2015-02-12 CN CN201520101327.8U patent/CN204425198U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105323925A (en) * | 2015-11-04 | 2016-02-10 | 浙江榆阳电子有限公司 | Power supply quick starting circuit |
| CN107592007A (en) * | 2017-09-21 | 2018-01-16 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit |
| CN110048587A (en) * | 2019-05-14 | 2019-07-23 | 安徽亚辉电气自动化有限公司 | A kind of supply harmonic suppressor with buffer protection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20150624 Termination date: 20220212 |