CN1909354B - Starting circuit for power converter - Google Patents
Starting circuit for power converter Download PDFInfo
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- CN1909354B CN1909354B CN2006101097194A CN200610109719A CN1909354B CN 1909354 B CN1909354 B CN 1909354B CN 2006101097194 A CN2006101097194 A CN 2006101097194A CN 200610109719 A CN200610109719 A CN 200610109719A CN 1909354 B CN1909354 B CN 1909354B
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Abstract
The invention relates to a start circuit of power converter, which comprises: first electric crystal, resistance, second electric crystal, third electric crystal, and diode, wherein the first electric crystal is coupled to one voltage source; the third electric crystal is serially connected to the first electric crystal, to output one voltage to the control circuit of power converter; the diode is coupled to the transform winding and control circuit of power converter to power the control circuit; the second electric crystal, via one control signal controls the first and third crystals; the resistance is coupled to the first and third electric crystals; when the second electric crystal is cut off, the resistance will supply one deflected voltage, to connect the first and third electric crystals; when the second electric crystal is connected, the third one is cut off, and the first electric crystal is in negative deflected voltage state.
Description
Technical field
The invention relates to a kind of start-up circuit, be meant a kind of high-voltage starting circuit of power converter especially.
Background technology
See also Fig. 1, it is a circuit diagram of commonly using the start-up circuit of power converter.As shown in the figure, commonly use start-up circuit and be used to control a voltage source V
INConducting with end, and then provide a voltage V
DSupply voltage as a control circuit 10 of a power converter.When power converter starts, voltage source V
INPromptly supply voltage V via an electric crystal 11
D Electric crystal 11, one drain and one source pole couple voltage source V respectively
INWith control circuit 10.When control circuit 10 came into operation, a Transformer Winding 16 of power converter can provide another supply voltage to control circuit 10 via a diode 17 and an electric capacity 18.Afterwards, electric crystal 11 will be driven by an electric crystal 12 and end, to save electrical source consumption.Transformer Winding 16, it is coupled to an end of an earth terminal and diode 17.18 of electric capacity are coupled between the other end and earth terminal of diode 17, and electric capacity 18 more is coupled to control circuit 10.One resistance 15, it is coupled between the gate of the drain of electric crystal 11 and electric crystal 11.Resistance 15 is used to provide a bias voltage with conducting electric crystal 11.
Wherein, R
15Resistance value for resistance 15.
Generally speaking, voltage source V
INNormally by an AC power supply, when a very high line voltage (High Line Voltage) is coupled to voltage source V
INAnd behind over commutation, voltage source V
INVoltage may be up to 350 volts of direct voltages.Can learn by equation (1) that so resistance 15 will produce a significant power loss.Can learn according to aforesaid equation (1), can reduce power loss if the resistance value of resistance 15 is high more, so adopt the resistance 15 of high resistance, for example millions of ohms can effectively reduce power loss.Yet the resistance 15 of high resistance is not suitable for being integrated in the integrated circuit (integratedcircuit).
Therefore, the present invention promptly provides a kind of high efficiency start-up circuit at the problems referred to above, its cpable of lowering power loss, and can be integrated in integrated circuit, effectively to address the above problem.
Summary of the invention
Main purpose of the present invention is to provide a kind of start-up circuit of power converter, its cpable of lowering power loss.
The start-up circuit of power converter of the present invention, it includes one first electric crystal, an impedance means, one second electric crystal, one the 3rd electric crystal and a diode.First electric crystal has a negative critical voltage, and second electric crystal and the 3rd electric crystal are positive critical voltage device.First electric crystal couples a voltage source.The 3rd electric crystal is series at first electric crystal, and the control circuit of a supply voltage to power converter is provided.Diode is coupled to a Transformer Winding and the control circuit of power converter, and provides another supply voltage to control circuit.Second electric crystal is controlled first electric crystal and the 3rd electric crystal according to a controlling signal.Impedance means couples first electric crystal and the 3rd electric crystal, and when second electric crystal ends, provides one to be biased into first electric crystal and the 3rd electric crystal, so that first electric crystal and the 3rd electric crystal conducting.In case during the second electric crystal conducting, the 3rd electric crystal will end, and first electric crystal is the back bias voltage state.
According to the present invention, can reduce power loss.
Description of drawings
Fig. 1 is a circuit diagram of commonly using the start-up circuit of power converter;
Fig. 2 is the circuit diagram of a preferred embodiment of the start-up circuit of power converter of the present invention;
Fig. 3 has the voltage of electric crystal of negative critical voltage to the curve chart of electric current for the present invention;
The circuit diagram of current direction when Fig. 4 is start-up circuit conducting of the present invention;
Fig. 5 be start-up circuit of the present invention by the time current direction circuit diagram;
Fig. 6 is the circuit diagram of another preferred embodiment of the start-up circuit of power converter of the present invention.
The figure number explanation:
10 control circuits, 11 electric crystals
12 electric crystals, 14 inverters
15 resistance, 16 Transformer Winding
17 diodes, 18 electric capacity
20 first electric crystals 25 the 3rd electric crystal
30 impedance means, 40 inverters
50 second electric crystals, 60 resistance
70 electric capacity, 90 diodes
100 Transformer Winding I
JElectric current
V
DVoltage V
INVoltage source
V
JVoltage S
NControlling signal
Embodiment
See also Fig. 2, it is the circuit diagram of a preferred embodiment of start-up circuit of the present invention.As shown in the figure, start-up circuit of the present invention includes one first electric crystal 20, one second electric crystal 50, one the 3rd electric crystal 25, an impedance means 30 and a diode 90.First electric crystal 20 has a negative critical voltage, so first electric crystal is a negative critical voltage device.Second electric crystal 50 and the 3rd electric crystal 25 are positive critical voltage device.First electric crystal 20 has one first end, one second end and one the 3rd end, and first end of first electric crystal 20 is coupled to a voltage source V
INThe 3rd electric crystal 25, it is series at first electric crystal 20, and according to voltage source V
INExport a voltage V
D, so that the control circuit 10 of a supply voltage to power converter to be provided.One drain of the 3rd electric crystal 25 is connected in second end of first electric crystal 20, and the one source pole of the 3rd electric crystal 25 then is coupled to control circuit 10.
The present invention is that impedance means 30 is coupled between second end and the 3rd end of first electric crystal 20 for conducting first electric crystal 20 and the 3rd electric crystal 25.In addition, impedance means 30 more is coupled between the gate of the drain of the 3rd electric crystal 25 and the 3rd electric crystal 25.So impedance means 30 can provide one to be biased into first electric crystal 20 and the 3rd electric crystal 25.Wherein, impedance means 30 can be a resistance or an electric crystal.One electric capacity 70, the one end is coupled to control circuit 10, and the other end of electric capacity 70 then is coupled to earth terminal.One diode 90, one end are coupled to electric capacity 70 and control circuit 10, and the other end of diode 90 then is coupled to a Transformer Winding 100 of power converter.When control circuit 10 comes into operation, Transformer Winding 100 will provide another supply voltage to control circuit 10 via diode 90 and electric capacity 70.Afterwards, by first electric crystal 20 and the 3rd electric crystal 25 cut-ff voltage source V
INThe transmission power supply is to save electrical source consumption.Multiple with reference to figure 2, one controlling signal S
NTransfer to an input of start-up circuit, with conducting second electric crystal 50, and then cut-ff voltage source V
INSecond electric crystal 50, the one gate receives controlling signal S via an inverter 40
NWherein, an input of inverter 40 receives controlling signal S
N, an output of inverter 40 then is coupled to the gate of second electric crystal 50.The one source pole of second electric crystal 50 is coupled to earth terminal, and a drain of second electric crystal 50 is coupled to the gate of the 3rd electric crystal 25 and the 3rd end of first electric crystal 20.So, when second electric crystal 50 according to controlling signal S
NEnabled status and by the time, impedance means 30 can provide and be biased into the 3rd electric crystal 25 and first electric crystal 20, this bias voltage can conducting the 3rd electric crystal 25 and first electric crystal 20.
In case after control circuit 10 comes into operation in the power converter, and second electric crystal 50 is according to controlling signal S
NThe disabled state conducting time, the 3rd electric crystal 25 will end, with cut-ff voltage source V
IN, and then stop output supply voltage to control circuit 10.Simultaneously, impedance means 30 will provide back bias voltage to the first electric crystal 20.Just second electric crystal 50 will provide back bias voltage to the first electric crystal 20 via impedance means 30, so be that may command first electric crystal 20 ends.Wherein, first electric crystal 20 has a negative critical voltage-V
TH, as shown in Figure 3.
See also Fig. 3, it is the curve chart of the voltage of first electric crystal 20 of the present invention to electric current.Electric current I in the diagram
JBe first end by first electric crystal 20 and the electric current of second end.Voltage V
JBe the 3rd end of first electric crystal 20 and the voltage between second end.In the present invention, first electric crystal 20 is a voltage control impedance means.As shown in Figure 3, voltage V
JDuring reduction, electric current I
JAlso can be along with reduction, and as voltage V
JBe lower than the negative critical voltage-V of first electric crystal 20
THThe time, first electric crystal 20 will end.
See also Fig. 4 and Fig. 5, its show respectively start-up circuit of the present invention in conducting and by the time, electric current I
JThe direction that flows.Resistance 60 in the diagram is the enforcement aspect of the impedance means 30 of Fig. 2.In Fig. 4, controlling signal S
NBe enabled status, 50 of second electric crystals are according to controlling signal S
NEnabled status and end, so do not have electric current to pass through resistance 60, so resistance 60 provides the voltage V of zero-bias to the first electric crystal 20
JThis external resistance 60 also provides an identical bias between the gate and drain of the 3rd electric crystal 25, therefore, first electric crystal 20 and the 3rd electric crystal 25 both all can conducting.
In Fig. 5, controlling signal S
NBe disabled state, 50 of second electric crystals are according to controlling signal S
NDisabled state and conducting, the 3rd electric crystal 25 is that end the accurate position of low-voltage because of its gate.The same time, electric current I
JBe to flow through second electric crystal 50 and resistance 60.This moment, resistance 60 provided the voltage V of back bias voltage to the first electric crystal 20
JIn this moment, electric current I
JThe increase meeting further make and provide to the voltage V of first electric crystal 20
JBack bias voltage increase.When back bias voltage reaches negative critical voltage-V
THThe time, first electric crystal 20 will be by to avoid electric current I
JIncrease.
Start-up circuit of the present invention is to operate in the negative feedback mode.Though when the 3rd electric crystal 25 ends, an electric current is still arranged by first electric crystal 20, the current value of this electric current is very little, so its power consumption that causes can be ignored.Because first electric crystal 20 can be integrated in the integrated circuit with impedance means 30, so start-up circuit shown in Figure 2 of the present invention can reach purpose of the present invention and be integrated in the integrated circuit.
See also Fig. 6, it is the circuit diagram of another preferred embodiment of the start-up circuit of power converter of the present invention.As shown in the figure, this embodiment does not include the 3rd electric crystal 25 shown in the embodiment of Fig. 2.First electric crystal 20 of this embodiment is coupled to voltage source V
IN, to receive voltage source V
INAnd provide one to supply the control circuit 10 of voltage to power converter.This embodiment does not have the 3rd electric crystal 25, so when 50 conductings of second electric crystal, an electric current will flow to second electric crystal 50 from electric capacity 70 via impedance means 30.Though impedance means 30 will provide back bias voltage to end first electric crystal 20, owing to can cause power loss from the electric current of electric capacity 70 outputs.So the impedance means 30 of Fig. 6 must have high resistance, to reduce power loss.
The above, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, all equalizations of doing according to the described shape of claim scope of the present invention, structure, feature and spirit change and modify, and all should be included in the interest field of the present invention.
Claims (10)
1. the start-up circuit of a power converter is characterized in that, it includes:
One the first transistor, it has one first end, one second end and one the 3rd end, and this first end couples a voltage source;
One the 3rd transistor, it has a drain electrode, one source pole and a grid, the 3rd transistorized should the drain electrode connects this second end of this first transistor, the 3rd transistorized this source electrode is coupled to a control circuit of this power converter, and the 3rd transistor provides a supply voltage to this control circuit;
One diode, it is coupled to a Transformer Winding and this control circuit of this power converter, to provide another supply voltage to this control circuit;
One transistor seconds, it has a drain electrode, one source pole and a grid, this drain electrode of this transistor seconds couples the 3rd end of the 3rd transistorized this grid and this first transistor, this source electrode of this transistor seconds is coupled to an earth terminal, this grid of this transistor seconds receives a controlling signal, this controlling signal is used for this transistor seconds of conducting, to end the 3rd transistor;
One impedance means, it is coupled between the 3rd end and this second end of this first transistor;
Wherein, when this transistor seconds ended, this impedance means provided a bias voltage, with this first transistor of conducting the 3rd transistor AND gate;
This first transistor has a negative critical voltage, and when this bias voltage reaches this negative critical voltage, this first transistor ends;
During this transistor seconds conducting, this impedance means provides a back bias voltage to this first transistor;
After this control circuit comes into operation, this transistor seconds conducting.
2. start-up circuit as claimed in claim 1 is characterized in that, this transistor seconds and the 3rd transistor are positive critical voltage device.
3. start-up circuit as claimed in claim 1 is characterized in that, this first transistor is a voltage control impedance means, when the 3rd transistor ends, an electric current is still arranged by this first transistor.
4. start-up circuit as claimed in claim 1 is characterized in that, this impedance means can be a resistance or a transistor.
5. the start-up circuit of a power converter is characterized in that, it includes:
One the first transistor, it has one first end, one second end and one the 3rd end, and this first end couples a voltage source;
One the 3rd transistor, it has a drain electrode, one source pole and a grid, and the 3rd transistorized should the drain electrode connects this second end of this first transistor, so that the control circuit of a supply voltage to this power converter to be provided according to this voltage source;
One impedance means, it couples between the 3rd end and this second end of this first transistor, and couples the 3rd transistorized this drain electrode, in order to a bias voltage to be provided, with this first transistor of conducting and the 3rd transistor;
One transistor seconds, it couples the 3rd transistor, in order to end the 3rd transistor;
Wherein, this transistor seconds is controlled by a controlling signal;
This first transistor has a negative critical voltage, and when this bias voltage reaches this negative critical voltage, this first transistor ends;
This start-up circuit more includes a diode, and this diode is coupled to a Transformer Winding and this control circuit of this power converter, to provide another supply voltage to this control circuit;
During this transistor seconds conducting, provide a back bias voltage to this first transistor via this impedance means.
6. start-up circuit as claimed in claim 5 is characterized in that, this transistor seconds and the 3rd transistor are positive critical voltage device.
7. start-up circuit as claimed in claim 5 is characterized in that, this first transistor is a voltage control impedance means, when the 3rd transistor ends, an electric current is still arranged by this first transistor.
8. start-up circuit as claimed in claim 5 is characterized in that, this impedance means can be a resistance or a transistor.
9. the start-up circuit of a power converter is characterized in that, it includes:
One the first transistor, this first transistor have first end, second end and the 3rd end, and this first end couples a voltage source, so that the control circuit of a supply voltage to this power converter to be provided;
One impedance means, it couples this first transistor and this supply voltage, in order to a bias voltage to be provided, with this first transistor of conducting;
One transistor seconds, it couples this first transistor and this impedance means, in order to end this first transistor;
One diode, it is coupled to a Transformer Winding and this control circuit of this power converter, to provide another supply voltage to this control circuit;
Wherein, this transistor seconds is controlled by a controlling signal;
This first transistor has a negative critical voltage, and when this bias voltage reaches this negative critical voltage, this first transistor ends;
After this control circuit comes into operation, this transistor seconds conducting;
During this transistor seconds conducting, provide a back bias voltage to this first transistor, to end this first transistor via this impedance means.
10. the start-up circuit of a power converter is characterized in that, it includes:
One the first transistor, this first transistor have first end, second end and the 3rd end, and this first end couples a voltage source, so that a control circuit of supply voltage to one power converter to be provided;
One impedance means, it couples this first transistor and this supply voltage, in order to a bias voltage to be provided, with this first transistor of conducting;
One transistor seconds, it couples this first transistor and this impedance means, in order to end this first transistor;
Wherein, this transistor seconds is controlled by a controlling signal;
Wherein, this first transistor has a negative critical voltage, and when this bias voltage reaches this negative critical voltage, this first transistor ends;
After this control circuit comes into operation, this transistor seconds conducting;
During this transistor seconds conducting, provide a back bias voltage to this first transistor, to end this first transistor via this impedance means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101097194A CN1909354B (en) | 2006-08-07 | 2006-08-07 | Starting circuit for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101097194A CN1909354B (en) | 2006-08-07 | 2006-08-07 | Starting circuit for power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1909354A CN1909354A (en) | 2007-02-07 |
| CN1909354B true CN1909354B (en) | 2010-11-10 |
Family
ID=37700367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101097194A Expired - Fee Related CN1909354B (en) | 2006-08-07 | 2006-08-07 | Starting circuit for power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1909354B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117649B (en) * | 2011-11-16 | 2016-01-20 | 深圳市明微电子股份有限公司 | A kind of start-up circuit control method of zero-power and device |
| CN103078486A (en) * | 2013-01-10 | 2013-05-01 | 无锡华润上华半导体有限公司 | High-voltage starting circuit in power supply converter |
| CN104253529B (en) * | 2013-06-25 | 2018-06-15 | 无锡华润上华科技有限公司 | The start-up circuit and power management chip of power management chip |
| CN104518654B (en) * | 2013-10-08 | 2018-06-15 | 无锡华润上华科技有限公司 | High-voltage starting circuit |
| CN109787456A (en) * | 2019-02-28 | 2019-05-21 | 中国电子科技集团公司第五十八研究所 | A kind of grid driving chip boostrap circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285369A (en) * | 1992-09-01 | 1994-02-08 | Power Integrations, Inc. | Switched mode power supply integrated circuit with start-up self-biasing |
-
2006
- 2006-08-07 CN CN2006101097194A patent/CN1909354B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285369A (en) * | 1992-09-01 | 1994-02-08 | Power Integrations, Inc. | Switched mode power supply integrated circuit with start-up self-biasing |
Non-Patent Citations (1)
| Title |
|---|
| JP平8-63963A 1996.03.08 |
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| CN1909354A (en) | 2007-02-07 |
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Granted publication date: 20101110 Termination date: 20210807 |
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