CN205070792U - Switching power supply from supply circuit - Google Patents
Switching power supply from supply circuit Download PDFInfo
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- CN205070792U CN205070792U CN201520738519.XU CN201520738519U CN205070792U CN 205070792 U CN205070792 U CN 205070792U CN 201520738519 U CN201520738519 U CN 201520738519U CN 205070792 U CN205070792 U CN 205070792U
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Abstract
The utility model discloses a switching power supply from supply circuit, including starting circuit and auxiliary winding circuit, starting circuit lower and can not satisfy control chip work needed the time at switching power supply module's input voltage, with voltage boost to the voltage that can satisfy control chip work needed of input, the VCC end of carrying control chip is the chip power supply, thereby makes chip work and outlet driving signal make switching power supply module completion start -up and get into switching power supply module 1, the auxiliary winding circuit, coupling switching power supply's high frequency power transformer's pulse voltage exports the supplementary power supply voltage in a tributary behind the rectifying and wave -filtering, for control chip's VCC power supply. The utility model discloses the specially adapted is less than the required minimum power supply voltage's of control chip work DCDC switching power supply self -power application scenario for input voltage.
Description
Technical field
The utility model relates to a kind of self-powered circuit of Switching Power Supply, particularly a kind of for input voltage is lower than the self-powered circuit of the DC/DC Switching Power Supply of supply power voltage minimum needed for control chip work.
Background technology
Under normal circumstances, independent-excited DC/DC converter is based on control chip, and control chip all needs a VCC to power, the voltage range of this feeder ear is very narrow, for universal UCC2843, its VCC terminal voltage allowed band is 8.6VDC-34VDC, consider the under-voltage starting resistor of control chip, the starting resistor of control chip generally arranges and is greater than 9VDC, consider that again driven switching tube allows the scope of driving voltage, then the permission voltage of chip VCC can not more than 20VDC, further consider the unfavorable factor that its power consumption causes, its VCC voltage is not advised more than 16VDC, consider that feedback voltage will exist return difference with starting resistor simultaneously, and there is a fluctuation range when different loads in feedback voltage, so be generally between 9VDC ~ 12VDC to the starting resistor of control chip.
Refer to Fig. 1, Fig. 1 is a kind of conventional supply power mode of currently available technology, start-up circuit Gather and input voltage is that Switching Power Supply does startup use, just start-up circuit is disconnected after Switching Power Supply normally works, by self-powered circuit continued power, self-powered circuit increases an auxiliary winding on main power transformer, and the pulse voltage waveform that auxiliary winding produces, by forming direct current VCC voltage after rectifying and wave-filtering, uses for control chip.
Start-up circuit due to above-mentioned supply power mode is a linear voltage-stabilizing circuit, Gather and input voltage is that Switching Power Supply does startup use, its voltage outputting to VCC is less than input voltage, if during the minimum VCC supply power voltage of the input voltage of Switching Power Supply lower than control chip need of work, control chip will enter VCC under-voltage condition because obtaining sufficiently high VCC supply power voltage, cause the problem that corresponding Switching Power Supply cannot be started shooting.Therefore these power supply circuits cannot meet for input voltage to provide the application scenario of power supply lower than the Switching Power Supply of the minimum VCC supply power voltage of control chip need of work.
Utility model content
The purpose of this utility model is, a kind of self-powered circuit is provided, described self-powered circuit possesses boost function, the input voltage that Switching Power Supply input can not be met chip operation obtains through boosting the VCC supply power voltage that can meet Switching Power Supply control chip need of work, for control chip is powered, can realize making Switching Power Supply to complete in the application scenario of input voltage lower than its control chip supply power voltage and start and normal work.
In order to achieve the above object, technical solutions of the utility model are as follows:
A self-powered circuit for Switching Power Supply, for the Vcc end power supply for control chip in Switching Power Supply, comprise start-up circuit and auxiliary winding circuit, start-up circuit is that the startup of control chip is powered, assist winding circuit after control chip starts and makes Switching Power Supply enter normal operating conditions for control chip provides continued power, described start-up circuit is booster circuit, comprise boosting unit, boosting rectifier control unit and regulator control block, described boosting unit comprises inductance and electric capacity, described regulator control block comprises voltage stabilizing didoe, described start-up circuit is booster circuit, comprise boosting unit, boosting rectifier control unit and regulator control block, described boosting unit comprises inductance and electric capacity, described regulator control block comprises voltage stabilizing didoe, described start-up circuit, self-oscillatory boosting operating state is entered from the machine that the opens moment of Switching Power Supply, namely described self-oscillatory boosting operating state forms path to make inductance have electric current to flow through and to carry out energy storage by boosting rectifier control unit, input voltage vin is made to be capacitor charging according to self-excited oscillatory frequency by the inductance of boosting unit energy storage, to form the output voltage Vq of boosting electricity as start-up circuit that superposes inductance energy on input voltage vin basis at electric capacity two ends, power to control chip in order to be exported an electricity higher than input voltage vin by the electric capacity of start-up circuit, after the output voltage Vq of start-up circuit or the output voltage Vf of auxiliary winding circuit is higher than the voltage stabilizing value of voltage stabilizing didoe, turn off start-up circuit by regulator control block.
Preferably, between described start-up circuit and auxiliary winding circuit, linear voltage-stabilizing circuit is provided with.
Preferably, described linear voltage-stabilizing circuit, comprise resistance R5, resistance R6, voltage stabilizing didoe Z2 and NPN triode Q4, its concrete annexation is, one end of resistance R5 connects the output of start-up circuit, the other end of resistance R5 is connected with the collector electrode of triode Q4, the emitter of triode Q4 is connected with the output of auxiliary winding circuit, the base stage of triode Q4 is connected with the negative electrode of voltage stabilizing didoe Z2, the plus earth of voltage stabilizing didoe Z2, one end of resistance R6 connects the output of start-up circuit, and the other end of resistance R6 is connected with the base stage of triode Q4.
Preferably, described start-up circuit, comprise by the first inductance L 1, first diode D1, 3rd electric capacity C3, the boosting unit that one NPN triode Q1 forms, with by the first resistance R1, second resistance R2, first electric capacity C1, second electric capacity C2, the boosting rectifier control unit of the second PNP triode Q2 composition, and by the first voltage stabilizing didoe Z1, second diode D2, 3rd resistance R3, the regulator control block of the 3rd PNP triode Q3 composition, the described input Vin of first inductance L 1 one end connecting valve power supply and one end of the first resistance R1, the other end of described first inductance L 1 connects the anode of the first diode D1, the collector electrode of the one NPN triode and one end of the second electric capacity C2, the negative electrode of described first diode D1 is connected with one end of the 3rd electric capacity C3, the emitter of the 3rd PNP triode respectively, and the output of together drawing afterwards as booster circuit is connected to the output of auxiliary winding circuit, the other end of the 3rd electric capacity C3 is connected with the emitter of a NPN triode Q1 and is connected to the reference ground of switch power module, the base stage of the one NPN triode Q1 connects the collector electrode of the second PNP triode Q2, and the emitter of the second PNP triode Q2 connects the other end of the first resistance R1 and one end of the first electric capacity C1, the base stage of the second PNP triode Q2 connects the negative electrode of the other end of the second electric capacity C2, one end of the second resistance R2 and the second diode D2, the other end of the first electric capacity C1 is connected with the other end of the second resistance R2 and is connected to reference to ground, the anode of the second diode D2 is connected with the collector electrode of the 3rd PNP triode Q3, the base stage of the 3rd PNP triode Q3 is connected with one end of the 3rd resistance R3, the other end of the 3rd resistance R3 is connected with the negative electrode of the first voltage stabilizing didoe Z1, the anode of the first voltage stabilizing didoe Z1 is connected to reference to ground.
Preferably, described auxiliary winding circuit, comprises the 3rd diode D3, the 4th electric capacity C4 and auxiliary winding N1; The anode of the 3rd described diode D3 is connected with the different name end of auxiliary winding N1; Be drawn out to VCC as the output of auxiliary winding circuit and be connected with the output of booster circuit after the negative electrode of the 3rd diode D3 is connected with one end of the 4th electric capacity C4; The Same Name of Ends of auxiliary winding N1 is connected with the other end of the 4th electric capacity C4 and is connected to reference to ground.
Preferably, the output voltage Vq of described start-up circuit is higher than input voltage vin and lower than the output voltage Vf of auxiliary winding circuit.
Compared with prior art, in the self-powered circuit of above-mentioned Switching Power Supply, the input voltage of Switching Power Supply obtains through boosting the VCC supply power voltage that can meet Switching Power Supply control chip need of work, for control chip is powered, can realize making Switching Power Supply to complete in the application scenario of input voltage lower than its control chip supply power voltage and start and normal work.
Accompanying drawing explanation
Fig. 1 is the self-powered circuit schematic diagram of prior art;
Fig. 2 is the circuit diagram of the case study on implementation one of the utility model self-powered circuit;
Fig. 3 is the circuit diagram of the utility model self-powered circuit in Switching Power Supply application;
Fig. 4 is the circuit diagram of the utility model self-powered circuit in the Switching Power Supply application of wide input voltage range.
Embodiment
Case study on implementation one:
Refer to Fig. 2, a kind of Switching Power Supply self-powered circuit comprises start-up circuit 201, auxiliary winding circuit 202.The input Vin of the input connecting valve power supply of described start-up circuit 201, the output of start-up circuit 201 is connected with the output of accessory power supply and is connected to the VCC of control chip.
Described start-up circuit 201, comprise the boosting unit be made up of the first inductance L 1, first diode D1, the 3rd electric capacity C3, a NPN triode Q1, with the boosting rectifier control unit be made up of the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, the second PNP triode Q2, and the regulator control block be made up of the first voltage stabilizing didoe Z1, the second diode D2, the 3rd resistance R3, the 3rd PNP triode Q3.The described input Vin of first inductance L 1 one end connecting valve power supply and one end of the first resistance R1, the other end of described first inductance L 1 connects the anode of the first diode D1, the collector electrode of a NPN triode and one end of the second electric capacity C2; The output holding with the VCC of control chip that the negative electrode of the described first diode D1 output of drawing after linking together with the emitter of one end of the 3rd electric capacity C3, the 3rd PNP triode Q3 as start-up circuit 201 is connected to auxiliary winding circuit 202 is connected; The other end of the 3rd electric capacity C3 be connected with the emitter of a NPN triode Q1 and the former limit being connected to switch power module with reference to (hereinafter referred is with reference to ground); The base stage of the one NPN triode Q1 connects the collector electrode of the second PNP triode Q2, and the emitter of the second PNP triode Q2 connects the other end of the first resistance R1 and one end of the first electric capacity C1; The base stage of the second PNP triode Q2 connects the negative electrode of the other end of the second electric capacity C2, one end of the second resistance R2 and the second diode D2; The other end of the first electric capacity C1 is connected with the other end of the second resistance R2 and is connected to reference to ground; The anode of the second diode D2 is connected with the collector electrode of the 3rd PNP triode Q3; The base stage of the 3rd PNP triode Q3 is connected with one end of the 3rd resistance R3; The other end of the 3rd resistance R3 is connected with the negative electrode of the first voltage stabilizing didoe Z1; The anode of the first voltage stabilizing didoe Z1 is connected to reference to ground.
Described auxiliary winding circuit 202, comprises the 3rd diode D3, the 4th electric capacity C4 and auxiliary winding N1; The anode of the 3rd described diode D3 is connected with the different name end of auxiliary winding N1; Draw the output as auxiliary winding circuit 202 after the negative electrode of the 3rd diode D3 is connected with one end of the 4th electric capacity C4, to be connected with the output of start-up circuit 201, and to hold with the VCC of control chip and be connected; The Same Name of Ends of auxiliary winding N1 is connected with the other end of the 4th electric capacity C4 and is connected to reference to ground; Described auxiliary winding N1 is an auxiliary winding in the high-frequency power transformer of switch power module; The pulse voltage of the high-frequency power transformer vice-side winding of described auxiliary winding N1 coupled switch power module, through the 3rd diode D3 rectification, after the 3rd electric capacity C3 and the 4th electric capacity C4 filtering, exports the auxiliary winding voltage of a direct current.
The implementation case realizes self-powered operation principle and describes as follows:
A kind of self-powered circuit of Switching Power Supply comprises start-up circuit 201, auxiliary winding circuit 202.Described start-up circuit 201 can be considered in Switching Power Supply the circuit possessing boost function, described auxiliary winding circuit 202 after completing startup for control chip provides continued power, the machine moment is opened in Switching Power Supply, because the base voltage of triode Q2 is lower than its emitter voltage, triode Q2 conducting, voltage Vin is through resistance R1, triode Q2 is transferred to the base stage of triode Q1 and makes its conducting, inductance L 1 starts to have electric current to flow through and carries out energy storage, electric capacity C2 plays the effect of positive feedback, triode Q1 is allowed to enter rapidly saturation region saturation conduction, then electric capacity C2 discharges and reverse charging, with the continuous rising of the base potential position of triode Q2, the base current flowing through triode Q2 and then constantly declines, electric current simultaneously in inductance L 1 constantly raises, when this electric current is enough large to when making triode Q1 exit saturation condition, the collector potential of triode Q1 raises, like this, triode Q1 and triode Q2 ends.Iterative cycles like this, inductive energy storage is exported according to self-excited oscillatory frequency, namely start-up circuit 201 enters self-oscillatory boosting operating state, input voltage is made to pass through the inductance L 1 of energy storage, be that electric capacity C3 charges through diode D1 according to self-excited oscillatory frequency again, and then provide the output voltage Vq of boosting electricity as start-up circuit superposing inductance energy on input voltage vin basis to the feeder ear VCC of control chip.Namely the feeder ear VCC being control chip by start-up circuit 201 provides a supply power voltage Vq higher than input voltage vin, for electric capacity C3 and C4 charges, for control chip, thus eliminate control chip startup stage be absorbed in the risk of under-voltage condition.Treat that inductance L 1 is discharged to terminate, the base voltage of triode Q2 is lower than after its emitter voltage, and start-up circuit 201 enters the next boosting work period.When the output voltage rising of booster start circuit 201 is greater than the minimum VCC voltage of control chip work, control chip is started working, the Switching Power Supply that makes output drive signal opens machine work, set up output voltage, along with the continuous rising of output voltage, the pulse voltage of the vice-side winding of the auxiliary winding N1 couples high frequency power transformer in auxiliary winding circuit 202, after diode D3 rectification, electric capacity C3 and electric capacity C4 filtering, auxiliary winding circuit 202 exports an auxiliary power supply voltage Vf higher than start-up circuit 201 output voltage, is control chip VCC continued power.After the output voltage Vq of start-up circuit or the output voltage Vf of auxiliary winding circuit is higher than the voltage stabilizing value of voltage stabilizing didoe Z1, voltage stabilizing didoe Z1 has leakage current to flow through, triode Q3 conducting, the base stage of triode Q2 should be transported to through triode Q3, diode D2 higher than the voltage of the voltage stabilizing value of voltage stabilizing didoe Z1, make the base voltage of triode Q2 higher than after its emitter voltage, triode Q2 ends, triode Q1 also ends thereupon, thus the control that have turned off start-up circuit 201 makes it realize boost function.When the output voltage Vq of the start-up circuit 201 or output voltage Vf of auxiliary winding circuit is lower than the voltage stabilizing value of voltage stabilizing didoe Z1, and the base voltage of triode Q2 is lower than after its emitter voltage, and start-up circuit 201 enters the next boosting work period.
The feature of foregoing circuit is also that the output voltage Vq of start-up circuit 201 completes the output voltage Vf of the auxiliary winding circuit 202 after startup lower than Switching Power Supply, therefore, after use the utility model provides the Switching Power Supply of power supply to complete startup, the feeder ear VCC of control chip powers by assisting winding circuit 202.
Through to power output being many groups sample (each group sample includes the sample one of Fig. 1 technical scheme and the sample two of Fig. 2 technical scheme) of 6-10W, test under the same test condition that input voltage vin is 3V ~ 12V, draw the sample of the utility model first embodiment and the correction data of prior art sample, as shown in table 1 below:
The performance comparison table of table 1 prior art sample and the utility model scheme sample
Case study on implementation two:
Refer to Fig. 4, a kind of Switching Power Supply self-powered circuit comprises start-up circuit 201, be with the difference of the first case study on implementation, linear voltage-stabilizing circuit is set up between start-up circuit 201 and auxiliary winding circuit 202, this linear voltage-stabilizing circuit comprises resistance R5, R6, voltage stabilizing didoe Z2 and NPN triode Q4, its concrete annexation is, one end of resistance R5 connects the output of start-up circuit, the other end of resistance R5 is connected with the collector electrode of triode Q4, the emitter of triode Q4 is connected with the output of auxiliary winding circuit, the base stage of triode Q4 is connected with the negative electrode of voltage stabilizing didoe Z2, the plus earth of voltage stabilizing didoe Z2, one end of resistance R6 connects the output of start-up circuit, the other end of resistance R6 is connected with the base stage of triode Q4.
Through to power output being many groups sample (each group sample includes the sample one of Fig. 1 technical scheme and the sample three of Fig. 4 technical scheme) of 6-10W, test under the same test condition that input voltage vin is 3V ~ 30V, draw the sample of the utility model second embodiment and the correction data of prior art sample, as shown in table 2 below:
The performance comparison table of table 2 prior art sample and the utility model scheme sample
Above embodiment just understands method of the present utility model and core concept for helping, with regard to the self-powered circuit of the utility model second case study on implementation, operation principle according to voltage stabilizing didoe Z2 is known, higher input voltage is also feasible, and when such as input voltage vin is 50V, this confession circuit also can normally work.For those skilled in the art; under the prerequisite not departing from utility model principle; by above describe with illustrate can naturally associate other be equal to application scheme; and some improvement and modification are carried out to the utility model, all fall into the protection range of claims of the present utility model.
Claims (6)
1. a self-powered circuit for Switching Power Supply, for the Vcc end power supply for control chip in Switching Power Supply, comprise start-up circuit and auxiliary winding circuit, start-up circuit is that the startup of control chip is powered; Auxiliary winding circuit for control chip provides continued power, is characterized in that after control chip starts and makes Switching Power Supply enter normal operating conditions,
Described start-up circuit is booster circuit, and comprise boosting unit, boosting rectifier control unit and regulator control block, described boosting unit comprises inductance and electric capacity, and described regulator control block comprises voltage stabilizing didoe,
Described start-up circuit, self-oscillatory boosting operating state is entered from the machine that the opens moment of Switching Power Supply, namely described self-oscillatory boosting operating state forms path to make inductance have electric current to flow through and to carry out energy storage by boosting rectifier control unit, input voltage vin is made to be capacitor charging according to self-excited oscillatory frequency by the inductance of boosting unit energy storage, to form the output voltage Vq of boosting electricity as start-up circuit that superposes inductance energy on input voltage vin basis at electric capacity two ends;
After the output voltage Vq of start-up circuit or the output voltage Vf of auxiliary winding circuit is higher than the voltage stabilizing value of voltage stabilizing didoe, turn off start-up circuit by regulator control block.
2. self-powered circuit according to claim 1, is characterized in that, between described start-up circuit and auxiliary winding circuit, be provided with linear voltage-stabilizing circuit.
3. self-powered circuit according to claim 2, it is characterized in that, described linear voltage-stabilizing circuit, comprise resistance R5, resistance R6, voltage stabilizing didoe Z2 and NPN triode Q4, its concrete annexation is, one end of resistance R5 connects the output of start-up circuit, the other end of resistance R5 is connected with the collector electrode of triode Q4, the emitter of triode Q4 is connected with the output of auxiliary winding circuit, the base stage of triode Q4 is connected with the negative electrode of voltage stabilizing didoe Z2, the anode of voltage stabilizing didoe Z2 connects with reference to ground, one end of resistance R6 connects the output of start-up circuit, the other end of resistance R6 is connected with the base stage of triode Q4.
4. according to claim 1, self-powered circuit described in 2 or 3, it is characterized in that, described start-up circuit, comprise by the first inductance L 1, first diode D1, 3rd electric capacity C3, the boosting unit that one NPN triode Q1 forms, with by the first resistance R1, second resistance R2, first electric capacity C1, second electric capacity C2, the boosting rectifier control unit of the second PNP triode Q2 composition, and by the first voltage stabilizing didoe Z1, second diode D2, 3rd resistance R3, the regulator control block of the 3rd PNP triode Q3 composition, the described input Vin of first inductance L 1 one end connecting valve power supply and one end of the first resistance R1, the other end of described first inductance L 1 connects the anode of the first diode D1, the collector electrode of the one NPN triode and one end of the second electric capacity C2, the negative electrode of described first diode D1 is connected with one end of the 3rd electric capacity C3, the emitter of the 3rd PNP triode respectively, and the output of together drawing afterwards as booster circuit is connected to the output of auxiliary winding circuit, the other end of the 3rd electric capacity C3 is connected with the emitter of a NPN triode Q1 and is connected to the reference ground of switch power module, the base stage of the one NPN triode Q1 connects the collector electrode of the second PNP triode Q2, and the emitter of the second PNP triode Q2 connects the other end of the first resistance R1 and one end of the first electric capacity C1, the base stage of the second PNP triode Q2 connects the negative electrode of the other end of the second electric capacity C2, one end of the second resistance R2 and the second diode D2, the other end of the first electric capacity C1 is connected with the other end of the second resistance R2 and is connected to reference to ground, the anode of the second diode D2 is connected with the collector electrode of the 3rd PNP triode Q3, the base stage of the 3rd PNP triode Q3 is connected with one end of the 3rd resistance R3, the other end of the 3rd resistance R3 is connected with the negative electrode of the first voltage stabilizing didoe Z1, the anode of the first voltage stabilizing didoe Z1 is connected to reference to ground.
5. the self-powered circuit according to claim 1,2 or 3, is characterized in that, described auxiliary winding circuit, comprises the 3rd diode D3, the 4th electric capacity C4 and auxiliary winding N1; The anode of the 3rd described diode D3 is connected with the different name end of auxiliary winding N1; Be drawn out to VCC as the output of auxiliary winding circuit and be connected with the output of booster circuit after the negative electrode of the 3rd diode D3 is connected with one end of the 4th electric capacity C4; The Same Name of Ends of auxiliary winding N1 is connected with the other end of the 4th electric capacity C4 and is connected to reference to ground.
6. self-powered circuit according to claim 1, is characterized in that, the output voltage Vq of described start-up circuit is higher than input voltage vin and lower than the output voltage Vf of auxiliary winding circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520738519.XU CN205070792U (en) | 2015-09-22 | 2015-09-22 | Switching power supply from supply circuit |
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| CN201520738519.XU CN205070792U (en) | 2015-09-22 | 2015-09-22 | Switching power supply from supply circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962620A (en) * | 2017-12-22 | 2019-07-02 | 广州金升阳科技有限公司 | A kind of self-powered circuit controlling chip |
| CN111182682A (en) * | 2020-03-05 | 2020-05-19 | 欧普照明股份有限公司 | Starting circuit and LED switch power supply system |
| CN112290789A (en) * | 2020-10-23 | 2021-01-29 | 广州金升阳科技有限公司 | Starting control method and circuit of asymmetric half-bridge flyback converter |
-
2015
- 2015-09-22 CN CN201520738519.XU patent/CN205070792U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962620A (en) * | 2017-12-22 | 2019-07-02 | 广州金升阳科技有限公司 | A kind of self-powered circuit controlling chip |
| CN109962620B (en) * | 2017-12-22 | 2024-02-13 | 广州金升阳科技有限公司 | Self-powered circuit of control chip |
| CN111182682A (en) * | 2020-03-05 | 2020-05-19 | 欧普照明股份有限公司 | Starting circuit and LED switch power supply system |
| CN112290789A (en) * | 2020-10-23 | 2021-01-29 | 广州金升阳科技有限公司 | Starting control method and circuit of asymmetric half-bridge flyback converter |
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