CN201118440Y - A power on circuit and electronic device - Google Patents
A power on circuit and electronic device Download PDFInfo
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- CN201118440Y CN201118440Y CNU2007201713073U CN200720171307U CN201118440Y CN 201118440 Y CN201118440 Y CN 201118440Y CN U2007201713073 U CNU2007201713073 U CN U2007201713073U CN 200720171307 U CN200720171307 U CN 200720171307U CN 201118440 Y CN201118440 Y CN 201118440Y
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Abstract
The utility model is applied to the field of switching power supply circuits and provides a bootstrap circuit and an electronic equipment; the bootstrap circuit comprises an AC voltage input port, a transformer, an output port, an auxiliary power supply circuit and a control circuit; the power supply end of the control circuit is electrically connected with an auxiliary winding of the transformer through a transistor, and the output end is electrically connected with a power switch tube to control the working state of the transformer through the power switch tube. The bootstrap circuit further comprises a first capacitor, a first voltage stabilizing tube, a second capacitor, a second voltage stabilizing tube, and a third capacitor, wherein, a first end of the first capacitor is electrically connected with the AC voltage input port through a start resistor and also electrically connected with the auxiliary winding of the transformer; the cathode of the first voltage stabilizing tube is connected with the first end of the first capacitor and the collector of the transistor, while the anode is connected with zero potential through the second capacitor; the cathode of the second voltage stabilizing tube and the base of the transistor are connected with the anode of the first voltage stabilizing tube. The utility model can achieve quick start when the capacitor with smaller capacitance value is selected as a start charging capacitor, namely, the first capacitor.
Description
Technical field
The utility model belongs to the switching power circuit field, relates in particular to a kind of boot-strap circuit and electronic equipment.
Background technology
At present, much the boot-strap circuit as the electronic equipment of set-top box and so on all adopts circuit structure shown in Figure 1, its principle is: after starting start, electric main AC is through rectifier bridge D and capacitor filtering rectification, ULK+ charges to capacitor C by resistance R by Node B, when the voltage that capacitor C is filled reaches the starting resistor of pwm control circuit, pwm control circuit is opened power switch pipe Q20 by output OUT, in case power switch pipe Q20 conducting, transformer secondary output just has induced voltage output, and auxiliary winding also has induced voltage, and the induced voltage of auxiliary winding is by providing power supply for PWM IC after the rectification.This moment, transformer began operate as normal, and secondary winding provides operating voltage by output OUT+ and OUT-to electronic equipment, and VCC voltage is provided by transistor Q10 by auxiliary winding after pwm control circuit starts.
Because when reaching the pwm control circuit starting resistor, pwm control circuit need consume part energy, and this part energy can only be provided by capacitor C, so the electric weight that requires capacitor C to fill must enough make the pwm control circuit operate as normal, the capacitance value that just requires capacitor C is enough greatly to drive pwm control circuit, this will inevitably make the charging interval of capacitor C longer, finally causes the starting up of electronic equipment quick inadequately.
The utility model content
The purpose of this utility model is to provide a kind of boot-strap circuit, is intended to solve in the present electronic equipment starting up's problem fast inadequately.
The utility model is achieved in that a kind of boot-strap circuit, comprises the ac voltage input mouth, the transformer that is electrically connected with described ac voltage input mouth, the output port that is electrically connected with described Secondary winding of transformer, and control circuit;
The feeder ear of described control circuit connects by the auxiliary winding electric of the described transformer of transistor AND gate, and the output of described control circuit is electrically connected with a power switch pipe, controls the operating state of described transformer by described power switch pipe; It is characterized in that described boot-strap circuit further comprises:
First electric capacity, its first end is electrically connected with described ac voltage input mouth by resistance, is connected with the auxiliary winding electric of described transformer simultaneously; Its second termination zero potential;
First voltage-stabiliser tube, its negative electrode is connected with first end of described first electric capacity, is connected with described transistorized collector electrode simultaneously;
Second electric capacity, its first end is connected with the anode of described first voltage-stabiliser tube; Its second termination zero potential;
Second voltage-stabiliser tube, its negative electrode is connected with described transistorized base stage, is connected with the anode of described first voltage-stabiliser tube simultaneously; Its anode connecting to neutral current potential; And
The 3rd electric capacity, its first end is connected with described transistorized emitter, is connected with the feeder ear of described control circuit simultaneously; Its second termination zero potential.
Another purpose of the present utility model is to provide a kind of electronic equipment, described electronic equipment comprises a boot-strap circuit, described boot-strap circuit comprises the ac voltage input mouth, the transformer that is electrically connected with described ac voltage input mouth, the output port that is electrically connected with described Secondary winding of transformer, and control circuit;
The feeder ear of described control circuit connects by the auxiliary winding electric of the described transformer of transistor AND gate, and the output of described control circuit is electrically connected with a power switch pipe, controls the operating state of described transformer by described power switch pipe; It is characterized in that described boot-strap circuit further comprises:
First electric capacity, its first end is electrically connected with described ac voltage input mouth by resistance, is connected with the auxiliary winding electric of described transformer simultaneously; Its second termination zero potential;
First voltage-stabiliser tube, its negative electrode is connected with first end of described first electric capacity, is connected with described transistorized collector electrode simultaneously;
Second electric capacity, its first end is connected with the anode of described first voltage-stabiliser tube; Its second termination zero potential;
Second voltage-stabiliser tube, its negative electrode is connected with described transistorized base stage, is connected with the anode of described first voltage-stabiliser tube simultaneously; Its anode connecting to neutral current potential; And
The 3rd electric capacity, its first end is connected with described transistorized emitter, is connected with the feeder ear of described control circuit simultaneously; Its second termination zero potential.
In the utility model, by will be as the dividing potential drop of first electric capacity institute charging voltage that starts charging capacitor, promptly the voltage of second electric capacity offers control circuit, starting resistor as control circuit, when control circuit is activated, because the voltage that first electric capacity is filled is higher than the starting resistor of control circuit, so first electric capacity has enough energy to make the control circuit operate as normal, and then the less electric capacity of selection capacitance value that can be suitable when realizing is first electric capacity, reaches the purpose of the time that shortens the starting up.
Description of drawings
Fig. 1 is the boot-strap circuit figure in the electronic equipment that provides of prior art;
Fig. 2 is the boot-strap circuit figure in the electronic equipment that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model, offer pwm control circuit by the dividing potential drop that starts charging capacitor institute charging voltage, starting resistor as pwm control circuit, thereby when pwm control circuit is activated, be recharged the starting resistor that voltage that electric capacity fills is higher than pwm control circuit, there are enough energy to make the pwm control circuit operate as normal so be recharged electric capacity, and then can reduce to be recharged the capacitance value of electric capacity, realize shortening starting up's time.
Starting up's circuit in the electronic equipment that the utility model provides as shown in Figure 2, ac voltage input mouth AC is by being connected with the winding T1-A of transformer T by behind rectifier bridge D2 and the current rectifying and wave filtering circuit that capacitor C 4 is formed, be connected with first end of first capacitor C 1 by resistance R 1 simultaneously, second end of first capacitor C 1 then is connected to zero potential GND; First end of first capacitor C 1 also is connected with the negative electrode of the first voltage-stabiliser tube ZD1, and the anode of the first voltage-stabiliser tube ZD1 is then by second capacitor C, 2 back connecting to neutral current potential GND; First end of first capacitor C 1 also is connected with the collector electrode c of transistor Q1, the emitter e of transistor Q1 is connected with the input VCC of pwm control circuit, emitter e is connected to zero potential GND by the 3rd capacitor C 3 simultaneously, the base stage b of transistor Q1 is connected with the negative electrode of the second voltage-stabiliser tube ZD2, the anode of the second voltage-stabiliser tube ZD2 is connecting to neutral current potential GND then, and the anode of the first voltage-stabiliser tube ZD1 is connected with the negative electrode of the second voltage-stabiliser tube ZD2.
With reference to Fig. 2, the operation principle of this circuit is as follows: electric main is by input port AC input, behind rectifier bridge D2 and capacitor C 4 rectifying and wave-filterings, charge by 1 pair first capacitor C of resistance R 1 by Node B ULK+, when first electric capacity is charged to the voltage stabilizing value that reaches the first voltage-stabiliser tube ZD1, to 2 chargings of second capacitor C, the voltage of the base stage b of transistor Q1 rises with the voltage of second capacitor C 2 first capacitor C 1 by the first voltage-stabiliser tube ZD1.After the voltage of transistor Q1 base stage b reaches cut-in voltage, the voltage at the 3rd capacitor C 3 two ends also rises with the voltage of first capacitor C 1, but the voltage of the 3rd capacitor C 3 is lower than the voltage of first capacitor C 1 all the time, and the voltage stabilizing value that its difference equals the first voltage-stabiliser tube ZD1 adds the voltage that first capacitor C 1 is filled at the time interior nodes BULK+ to 2 chargings of second capacitor C.When the voltage at the 3rd capacitor C 3 two ends reaches the starting resistor of pwm control circuit, pwm control circuit is activated, because the existence of second capacitor C 2 and the first voltage-stabiliser tube ZD1, the voltage of first capacitor C 1 will be higher than the starting resistor of pwm control circuit, so first capacitor C 1 has enough energy to make the pwm control circuit operate as normal, the capacitance value that reduces first capacitor C 1 that like this can be suitable, thus starting up's time of electronic equipment shortened to a certain extent.
After being activated of pwm control circuit, it is by port OUT power controlling switching tube Q2 conducting, at this moment, transformer T can operate as normal, the induced voltage of secondary winding T1-B through diode D3 and capacitor C 5 rectifying and wave-filterings after by output port OUT+ and OUT-to power electronic equipment.After the operate as normal of pwm control circuit, winding T2-A provides operating voltage by port VCC to pwm control circuit by resistance R 2, diode D1 and transistor Q1, and then pwm control circuit power controlling switching tube Q2 conducting, transformer T starts working, secondary winding T1-B is the electronic equipment that is electrically connected with it, as power supplies such as set-top box.
In the utility model, by will be as the dividing potential drop of 1 charging voltage of first capacitor C that starts charging capacitor, promptly the voltage of the second capacitor C2 offers pwm control circuit, starting resistor as pwm control circuit, thereby when pwm control circuit is activated, the voltage that first capacitor C 1 is filled is higher than the starting resistor of pwm control circuit, so first capacitor C 1 has enough energy to make the pwm control circuit operate as normal, and then the less electric capacity of capacitance value of selecting for use that can be suitable is first capacitor C 1, reaches the purpose of the time that shortens the starting up.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1, a kind of boot-strap circuit comprises the ac voltage input mouth, the transformer that is electrically connected with described ac voltage input mouth, the output port that is electrically connected with described Secondary winding of transformer, and control circuit;
The feeder ear of described control circuit connects by the auxiliary winding electric of the described transformer of transistor AND gate, and the output of described control circuit is electrically connected with a power switch pipe, controls the operating state of described transformer by described power switch pipe; It is characterized in that described boot-strap circuit further comprises:
First electric capacity, its first end is electrically connected with described ac voltage input mouth by resistance, is connected with the auxiliary winding electric of described transformer simultaneously; Its second termination zero potential;
First voltage-stabiliser tube, its negative electrode is connected with first end of described first electric capacity, is connected with described transistorized collector electrode simultaneously;
Second electric capacity, its first end is connected with the anode of described first voltage-stabiliser tube; Its second termination zero potential;
Second voltage-stabiliser tube, its negative electrode is connected with described transistorized base stage, is connected with the anode of described first voltage-stabiliser tube simultaneously; Its anode connecting to neutral current potential; And
The 3rd electric capacity, its first end is connected with described transistorized emitter, is connected with the feeder ear of described control circuit simultaneously; Its second termination zero potential.
2, boot-strap circuit as claimed in claim 1 is characterized in that, described ac voltage input mouth is electrically connected by a current rectifying and wave filtering circuit with described transformer.
3, boot-strap circuit as claimed in claim 1 or 2 is characterized in that, the auxiliary winding of described transformer is connected with first end of described first electric capacity with diode by resistance.
4, a kind of electronic equipment comprises a boot-strap circuit, and described boot-strap circuit comprises the ac voltage input mouth, the transformer that is electrically connected with described ac voltage input mouth, the output port that is electrically connected with described Secondary winding of transformer, and control circuit;
The feeder ear of described control circuit connects by the auxiliary winding electric of the described transformer of transistor AND gate, and the output of described control circuit is electrically connected with a power switch pipe, controls the operating state of described transformer by described power switch pipe; It is characterized in that described boot-strap circuit further comprises:
First electric capacity, its first end is electrically connected with described ac voltage input mouth by resistance, is connected with the auxiliary winding electric of described transformer simultaneously; Its second termination zero potential;
First voltage-stabiliser tube, its negative electrode is connected with first end of described first electric capacity, is connected with described transistorized collector electrode simultaneously;
Second electric capacity, its first end is connected with the anode of described first voltage-stabiliser tube; Its second termination zero potential;
Second voltage-stabiliser tube, its negative electrode is connected with described transistorized base stage, is connected with the anode of described first voltage-stabiliser tube simultaneously; Its anode connecting to neutral current potential; And
The 3rd electric capacity, its first end is connected with described transistorized emitter, is connected with the feeder ear of described control circuit simultaneously; Its second termination zero potential.
5, electronic equipment as claimed in claim 4 is characterized in that, described ac voltage input mouth is electrically connected by a current rectifying and wave filtering circuit with described transformer.
As claim 4 or 5 described electronic equipments, it is characterized in that 6, the auxiliary winding of described transformer is connected with first end of described first electric capacity with diode by resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201713073U CN201118440Y (en) | 2007-11-29 | 2007-11-29 | A power on circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201713073U CN201118440Y (en) | 2007-11-29 | 2007-11-29 | A power on circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201118440Y true CN201118440Y (en) | 2008-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201713073U Expired - Fee Related CN201118440Y (en) | 2007-11-29 | 2007-11-29 | A power on circuit and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201118440Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951136A (en) * | 2010-03-10 | 2011-01-19 | 杭州中恒电气股份有限公司 | Auxiliary power source bootstrapping circuit of power source converting device |
| CN102377327A (en) * | 2010-08-11 | 2012-03-14 | 美国快捷半导体有限公司 | High voltage startup circuit |
| WO2012100406A1 (en) * | 2011-01-24 | 2012-08-02 | 深圳矽睿芯科技有限公司 | Power supply circuit with low-voltage control and producing method thereof |
| WO2013082972A1 (en) * | 2011-12-08 | 2013-06-13 | 中联重科股份有限公司 | Discrete input apparatus, discrete input design method and detection method |
-
2007
- 2007-11-29 CN CNU2007201713073U patent/CN201118440Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951136A (en) * | 2010-03-10 | 2011-01-19 | 杭州中恒电气股份有限公司 | Auxiliary power source bootstrapping circuit of power source converting device |
| CN101951136B (en) * | 2010-03-10 | 2012-09-05 | 杭州中恒电气股份有限公司 | Auxiliary power source bootstrapping circuit of power source converting device |
| CN102377327A (en) * | 2010-08-11 | 2012-03-14 | 美国快捷半导体有限公司 | High voltage startup circuit |
| CN102377327B (en) * | 2010-08-11 | 2015-11-25 | 快捷半导体公司 | High-voltage starting circuit |
| WO2012100406A1 (en) * | 2011-01-24 | 2012-08-02 | 深圳矽睿芯科技有限公司 | Power supply circuit with low-voltage control and producing method thereof |
| WO2013082972A1 (en) * | 2011-12-08 | 2013-06-13 | 中联重科股份有限公司 | Discrete input apparatus, discrete input design method and detection method |
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Legal Events
| 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 |
Granted publication date: 20080917 Termination date: 20151129 |