CN2773989Y - Starter - Google Patents

Abstract

The utility model provides a starter, which can be used for cutting off a charging path of an input voltage source charging for a maintaining capacitor after a power supplier is started. The starter is connected to the input voltage source through a leaking pole end of a transistor; a source pole end is connected to the maintaining capacitor and an input end of a start control unit; an output end of the start control unit is connected to a grid pole end of the transistor, and a changing switch. Thus, the input voltage source controls the transistor to be conducted and charges the maintaining capacitor. After obtaining a start voltage from the maintaining capacitor, the start control unit controls the changing switch to be conducted for providing a power supply on the maintaining capacitor to a control circuit. The start control unit controls the transistor to be closed for cutting off the charging path of the input voltage source charging the maintaining capacitor. The starter simultaneously provides magnetic-lag critical voltage range to be used as a critical voltage reference when the power supplier starts or stops working.

Description

Starting drive

Technical field

The utility model refers to a kind of starting drive that starts or stops the reference of work critical voltage as power supply unit especially about a kind of starting drive.

Background technology

The switching controller U of power supply unit ₁Be used for controlling the change action of power supply unit, and the stable output of adjusting is provided.Yet, switching controller U ₁Need a supply voltage beginning that the regular event of internal control circuit can be provided.With reference to figure 1, be known power source supply electrical block diagram.As shown in Figure 1, in case input voltage V _INWhen putting on power supply unit, can be earlier by a starting resistance R _STKeep capacitor C to one _STCharge.When this keeps capacitor C _STOn voltage reach switching controller U ₁Starting resistor the time, switching controller U ₁To begin to control a power switch Q ₁Action is in order to a transformer T ₁Switch.After power supply unit is started working, this transformer T ₁An auxiliary winding N _ACan be by a diode D _AFurther transmit power supply and give switching controller U ₁, so that switching controller U to be provided ₁Regular event.

After start-up course finishes, this starting resistance R _STThen can be ineffective, do not need to exist.But in known circuit, this starting resistance R _STStill exist, and consume unnecessary power loss, the power P that it lost _RCan obtain by following formula (1):

$P_R=\frac{{(V_{\mathrm{IN}}-V_{\mathrm{DD}})}^2}{R_{\mathrm{ST}}}....................\left(1\right)$

Moreover, the relevant world organization of power supply to power supply unit under no-load standard a series of environmental protection (Green mode) specification, therefore, if can be with this starting resistance R after power supply unit starts _STCut off isolation, make it to consume unnecessary power loss, also or use and need not starting resistance R _STAs the start-up circuit of start assembly, solve starting resistance R _STThe problem of consumed power, this will improve the power consumption of power supply unit under no-load.

Summary of the invention

In view of this, the utility model proposes a kind of starting drive, need not starting resistance, and after power supply unit starts, cut off input voltage source to keeping the charge path of electric capacity charging, to save the power loss of power supply unit as start assembly.Simultaneously, starting drive more utilizes the magnetic hysteresis effect that one magnetic hysteresis threshold voltage ranges is provided, the critical voltage reference when starting or stoping power supply as power supply unit.

The utility model proposes a kind of starting drive, be applied to the startup of power supply unit, use a transistor drain end to be connected in input voltage source, the input of an electric capacity and a start-up control unit is kept in its source terminal connection one.The output of this start-up control unit is connected in the gate terminal that this transistorized gate terminal and is switched switch.The source terminal of this diverter switch is connected in this and keeps electric capacity simultaneously, and drain electrode end then is connected to a control circuit.Thus, this input voltage source is directly controlled this transistor turns, charge to keeping electric capacity simultaneously, after keeping voltage on the electric capacity and reaching a starting resistor, this diverter switch conducting can be controlled in this start-up control unit, allow and keep voltage on the electric capacity and can offer this control circuit and use, and control this transistor simultaneously and enter and end, this is kept the charge path of electric capacity charging in order to cut off this input voltage source.

Wherein, this transistor is a junction field effect transistor, and further includes a starting resistance, is connected in this input voltage source and this transistor drain end.In this situation, this start-up control unit includes: one the one P transistor npn npn, its source terminal are connected to this and keep electric capacity and this transistorized source terminal, and gate terminal is connected to this by one first resistance and keeps electric capacity; One the one N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects an earth terminal; One first clamper is connected between the source terminal and drain electrode end of a P transistor npn npn; One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of a N transistor npn npn, and is connected to this earth terminal by one second resistance; And an amplifying circuit, be connected in a N transistor npn npn drain electrode end, this keeps electric capacity, this diverter switch and this transistorized gate terminal, according to the switching of a N transistor npn npn, to carry out the amplification of signal.In this situation, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.In this situation, this amplifying circuit includes: one the 2nd P transistor npn npn, and its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this and keeps electric capacity, this diverter switch and this transistorized source terminal; One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in this diverter switch and this transistorized gate terminal; And one the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal.

Wherein, this transistor is a mos field effect transistor, and includes a starting resistance, is connected in the drain electrode end of this input voltage source and this mos field effect transistor.In this situation, this start-up control unit includes: one the one P transistor npn npn, its source terminal are connected to this source terminal of keeping electric capacity and this mos field effect transistor, and gate terminal is connected to this by one first resistance and keeps electric capacity; One the one N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects an earth terminal; One first clamper is connected between the source terminal and drain electrode end of a P transistor npn npn; One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of a N transistor npn npn, and is connected to this earth terminal by one second resistance; And an amplifying circuit, be connected in a N transistor npn npn drain electrode end, this keeps the gate terminal of electric capacity, this diverter switch and this mos field effect transistor, according to the switching of a N transistor npn npn, to carry out the amplification of signal.In this situation, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.In this situation, this amplifying circuit includes: one the 2nd P transistor npn npn, and its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this source terminal of keeping electric capacity, this diverter switch and this mos field effect transistor; One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch; One the 3rd resistor, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this with reference to the ground end; One second reverser, one input end connects the output of this first reverser; And one the 2nd N transistor npn npn, its source terminal is connected in this with reference to the ground end, and drain electrode end is connected in the gate terminal of this mos field effect transistor, and gate terminal is connected in the output of this second reverser.In addition, this amplifying circuit also can include: one the 2nd P transistor npn npn, and its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this source terminal of keeping electric capacity, this diverter switch and this mos field effect transistor; One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch; One the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal; One second reverser, one input end connects the output of this first reverser; One the 2nd N transistor npn npn, its source terminal are connected in and are connected to this by a divider resistance and keep electric capacity, and its drain electrode end is connected in the gate terminal of this mos field effect transistor, and its gate terminal is connected in the output of this second reverser; And a boost capacitor, its anode is connected to the gate terminal of this mos field effect transistor and the drain electrode end of the 2nd N transistor npn npn, and negative terminal is connected to this output of this first reverser and this input of this second reverser.In this situation, this boost capacitor is used for quickening this mos field effect transistor of conducting when power supply unit restarts.

The present invention also provides a kind of starting drive, is applied to power supply unit, is connected to an input voltage source by a starting resistance, and connect and keep an electric capacity and an auxiliary winding, include: a start-up control unit, have an input and an output, this input is connected in this and keeps electric capacity; One switches switch, is connected in the output of this start-up control unit and this keeps electric capacity; This input voltage source is kept electric capacity by starting resistance to this and is charged, and this start-up control unit is after keep electric capacity and obtain a starting resistor, and this diverter switch conducting of output control is used to a control circuit so that the power supply of keeping on the electric capacity to be provided.

Wherein, this start-up control unit includes: one the one P transistor npn npn, its source terminal are connected to this source terminal of keeping electric capacity and this diverter switch, and gate terminal is connected to this by one first resistance and keeps electric capacity; One N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects one with reference to the ground end; One first clamper, the source terminal and the drain electrode end that are connected in a P transistor npn npn are asked; One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of N transistor npn npn and is connected to this earth terminal by one second resistance; And an amplifying circuit, be connected in this N transistor npn npn drain electrode end, this keeps the gate terminal of electric capacity and this diverter switch, according to the switching of this N transistor npn npn, to carry out the amplification of signal.

Wherein, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.

Wherein, this amplifying circuit includes: one the 2nd P transistor npn npn, and its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this and keeps electric capacity, this diverter switch and this transistorized source terminal; One reverser, one input end are connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch; And one the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal.

Moreover, one first clamper and one second clamper are arranged in this start-up control unit, be Zener diode, those Zener diodes respectively have a breakdown voltage, and collapse in succession according to the rising of keeping voltage on the electric capacity, and then produce one first clamping voltage and one second clamping voltage, the magnetic hysteresis threshold voltage ranges when those clamping voltages start or stop work as power supply unit.

The utility model proposes a kind of starting drive, be applied to the startup of power supply unit, be connected in one and keep an electric capacity and an auxiliary winding, and be connected to an input voltage by a starting resistance.Starting drive of the present utility model uses the input of a start-up control unit to be connected in this and keeps electric capacity, and output then is connected to the gate terminal of a switching switch, and the source terminal of diverter switch is connected in this and keeps electric capacity, and drain electrode end is connected in a control circuit.Thus, input voltage source charges to keeping electric capacity by starting resistance, after keeping voltage on the electric capacity and reaching a starting resistor, this diverter switch conducting then can be controlled in the start-up control unit, keeps power supply on the electric capacity and can offer control circuit and use to allow.

Simultaneously, identical in this start-up control unit with the front narration, first clamper and second clamper according to this keep electric capacity voltage rising and in succession the collapse, and then produce first clamping voltage and second clamping voltage, the magnetic hysteresis threshold voltage ranges when those clamping voltages start or stop power supply as power supply unit.

Being noted that above general introduction and ensuing detailed description are all exemplary in nature, is in order to further specify claim of the present utility model.And about other purpose of the present utility model and advantage, will be set forth in follow-up explanation and accompanying drawing.

Description of drawings

Fig. 1 is a known power source supply electrical block diagram;

The power supply unit electrical block diagram that Fig. 2 uses for the utility model;

Fig. 3 is the starting drive circuit diagram of the utility model first embodiment;

Fig. 4 is the starting drive circuit diagram of the utility model second embodiment;

Fig. 5 is a mos field effect transistor parasitic capacitance equivalent schematic;

Fig. 6 is the starting drive circuit diagram of the utility model the 3rd embodiment; And

Fig. 7 is the starting drive circuit diagram of the utility model the 4th embodiment.

Wherein, description of reference numerals is as follows:

Known:

R _STResistance C _STElectric capacity

U ₁Switching controller Q ₁Power switch

T ₁Transformer D _ADiode

This is novel:

T ₁Transformer D _ADiode

Q ₁Power switch U ₂Switching controller

R _STStarting resistance C _STKeep electric capacity

40 transistors, 45 transistors

Z ₁The first clamper Z ₂Second clamper

R ₂Second resistance R ₁First resistance

R ₃The 3rd resistance C ₁Boost capacitor

R _ADivider resistance R _BDivider resistance

61 the one P transistor npn npns

62 the 2nd P transistor npn npns, 63 diverter switches

65 N transistor npn npns, 71 first reversers

72 second reversers, 80 start-up control unit

82 amplifying circuit N _AAuxiliary winding

The GND earth terminal

Embodiment

Please refer to Fig. 2, be the power supply unit electrical block diagram of the utility model use.The utility model starting drive is arranged at a switching controller U ₂In, in case input voltage V _INWhen putting on power supply unit, starting drive promptly begins action, makes input voltage V _INThe power supply of output can be earlier by switching controller U ₂Keep capacitor C to one _STCharge.When this keeps capacitor C _STOn voltage when reaching a starting resistor, starting drive begins action so that switching controller U to be provided ₂The power supply of work institute palpus allows switching controller U ₂Can control a power switch Q ₁To a transformer T ₁Switch.In the above-mentioned explanation, at input voltage source V _INBy switching controller U ₂Keep capacitor C to one _STOn the charge path of charging, further can be in the starting resistance R that wherein connects _ST, be used for slowing down the startup required time.

As switching controller U ₂After starting working, this transformer T ₁An auxiliary winding N _ACan be by a diode D _AThis is kept capacitor C _STCharging is to provide power supply to switching controller U ₂Use.Simultaneously, starting drive of the present utility model can cut off input voltage source V after starting _INThis is kept capacitor C _STThe charge path of charging is to save the power loss of power supply unit.And starting drive also utilizes the magnetic hysteresis effect, to provide a magnetic hysteresis threshold voltage ranges as switching controller U ₂Critical voltage reference when starting or stoping power supply.

Please refer to Fig. 3, be the starting drive circuit diagram of the utility model first embodiment.The utility model starting drive is arranged at switching controller U shown in Figure 2 ₂In, and in order to power supply V to be provided _CCGive switching controller U ₂An inner control circuit 90 uses.Starting drive of the present utility model is applied to the startup of power supply unit, is directly connected to input voltage V _INOr by a starting resistance R _STBe connected to input voltage V _IN, and connect simultaneously and keep capacitor C _STStarting drive switches switch 63 by a transistor 40, a start-up control unit 80 and to be formed, this transistor 40 is a junction field effect transistor (JFET), it has a negative critical voltage, when the voltage between its gate terminal and source terminal is lower than this negative critical voltage, promptly can enter cut-off state.

Multiple this transistor 40 has one source pole end, a gate terminal and a drain electrode end with reference to figure 3, and drain electrode end is connected to input voltage source V _IN, source terminal and gate terminal are connected to this start-up control unit 80.This start-up control unit 80 includes: one the one P transistor npn npn 61, its source terminal is connected to this and keeps capacitor C _ST, gate terminal is connected to an amplifying circuit 82, and by one first resistance R ₁Be connected to this and keep capacitor C _STOne the one N transistor npn npn 65, its drain electrode end is connected to the gate terminal of a P transistor npn npn 61, and source terminal then connects an earth terminal GND; One first clamper Z ₁, be connected between the source terminal and drain electrode end of a P transistor npn npn 61; And one second clamper Z ₂, the one end is connected in the drain electrode end of a P transistor npn npn 61, and the other end is connected to the gate terminal of a N transistor npn npn 65, and by one second resistance R ₂Be connected to this earth terminal GND.

Multiple with reference to figure 3, this amplifying circuit 82 includes: one the 2nd P transistor npn npn 62, and its gate terminal is connected to the gate terminal of a P transistor npn npn 61, and its source terminal is connected in this and keeps capacitor C _STOne reverser 71, one input end is connected in the drain electrode end of the 2nd P transistor npn npn 62, and an output is connected in the gate terminal of this diverter switch 63 and transistor 40; And one the 3rd resistance R ₃, the one end is connected in the drain electrode end of the 2nd P transistor npn npn 62, and the other end is connected in this earth terminal GND.

In the above-mentioned explanation, this first clamper Z ₁With this second clamper Z ₂Be all Zener diode, it respectively has a breakdown voltage.This first clamper Z ₁With this second clamper Z ₂Keep capacitor C according to this _STVoltage rising and collapse in succession and then produces one first clamping voltage V ₁With one second clamping voltage V ₂As a magnetic hysteresis threshold voltage ranges.This first clamping voltage V ₁Magnitude of voltage be the breakdown voltage V of first clamper _Z1, second clamper breakdown voltage V _Z2And the second resistance terminal voltage V _RAdditive value.This second clamping voltage V ₂Magnitude of voltage be the breakdown voltage V of this second clamper _Z2With this second resistance terminal voltage V _RAdditive value.

Multiple the gate terminal of this diverter switch 63 is connected in this amplifying circuit 82 with reference to figure 3, and source terminal then is connected to this and keeps capacitor C _ST, drain electrode end then is connected to this control circuit 90.By this, input voltage V _INWhen putting on power supply unit, transistor 40 conducting at once in the starting drive begins action, makes input voltage V _INCan be directly or via this starting resistance R _STThis is kept capacitor C _STCharge.When this keeps capacitor C _STOn voltage (this starting resistor is the first clamping voltage V when reaching a starting resistor ₁), this first clamper Z ₁With this second clamper Z ₂Can produce collapse, and in this second resistance R ₂Terminal voltage V is set up at two ends _R, terminal voltage V _RMake N transistor npn npn 65 conductings of winning.Can allow the gate terminal of a P transistor npn npn 61, the output of this amplifying circuit 82, the gate terminal of this diverter switch 63 and the gate terminal of this transistor 40 be connected to earth terminal GND after 65 conductings of the one N transistor npn npn, and then allow a P transistor npn npn 61 and the also conducting in succession of this diverter switch 63.

Because transistor 40 enters and ends, and then cuts off this input voltage source V _INThis is kept capacitor C _STThe charge path of charging is in order to save the power loss of power supply unit.After 61 conductings of the one P transistor npn npn with the first clamper Z ₁Short circuit allows it lose the voltage clamp effect.Because diverter switch 63 enters conducting, making should auxiliary winding N _ABy this diode D _AThis is kept capacitor C _STThe power supply that provides can offer control circuit 90 by this diverter switch 63 and use.

Moreover, because the first clamper Z ₁By a P transistor npn npn 61 short circuits, therefore should auxiliary winding N _ABy this diode D _AThis is kept capacitor C _STIf the power supply that provides is higher than the second clamping voltage V ₂, 90 of control circuits can work on.Otherwise, if be lower than the second clamping voltage V ₂, this second clamper Z ₂Can can't enter the collapse state, and then the P transistor npn npn 61 of winning, diverter switch 63 and a N transistor npn npn 65 are ended in succession, and transistor 40 can enter conducting.At this moment, this control circuit 90 can quit work, and waits for that again this keeps capacitor C _STBe charged to this starting resistor once more, begin to carry out work.

In the above-mentioned explanation, this first clamping voltage V ₁With this second clamping voltage V ₂As a magnetic hysteresis threshold voltage ranges.That is to say that this keeps capacitor C _STOn current potential to be higher than the first clamping voltage V ₁, control circuit 90 begins to start, and current potential will be lower than the second clamping voltage V ₂, control circuit 90 work just can stop.

This amplifying circuit 82 is according to the change action of a N transistor npn npn 65, carrying out the amplification of signal, and then control its switch 63 conductings simultaneously oxide-semiconductor control transistors 40 end.Diverter switch 63 enters conducting, makes this keep capacitor C _STOn power supply can offer control circuit 90 by this diverter switch 63 and use.And transistor 40 is by cutting off this input voltage source V _INThis is kept capacitor C _STThe charge path of charging is in order to save the power loss of power supply unit.

Multiple with reference to figure 3, after power supply unit starts,, load end causes auxiliary winding N if being short-circuited _ACan't pass through diode D _AThis is kept capacitor C _STCharging, this moment, the one N transistor npn npn 65 was for ending.Input by first reverser 71 in the amplifying circuit 82 is pulled to earth terminal, and the output that makes the reverser 71 of winning is a high-potential voltage.This high-potential voltage will cause transistor 40 conductings, make that power supply unit begins again to restart.

Cooperate Fig. 3, please refer to Fig. 4, be the starting drive circuit diagram of the utility model second embodiment.The utility model second embodiment and the first embodiment circuit do not exist together, be electronic building brick and annexation thereof in the amplifying circuit 82, and the employed transistor 45 of the utility model second embodiment is a mos field effect transistor (MOSFET).The employed amplifying circuit of the utility model second embodiment is except original the 2nd P transistor npn npn 62, first reverser 71 and the 3rd resistance R among first embodiment ₃Also be connected with one second reverser 72 and one the 2nd N transistor npn npn 73 outward.In the above-mentioned explanation, the 2nd P transistor npn npn 62 and the 3rd resistance R ₃Annexation is same as first embodiment, and first reverser, 71 outputs are connected in the gate terminal of this diverter switch 63 and the input of one second reverser 72.The 2nd N transistor npn npn 73, its source terminal is connected in earth terminal GND, and drain electrode end is connected in the gate terminal of transistor 45, and gate terminal is connected in the output of this second reverser 72.

Please refer to Fig. 5, be mos field effect transistor parasitic capacitance equivalent schematic.Transistor 45 has drain D, grid G and three end points of source S, general mos field effect transistor is in making the back has parasitic capacitance between each end points effect, as shown in Figure 5, parasitic capacitance 91 is arranged between drain D and grid G, parasitic capacitance 92 is arranged between grid G and source S, parasitic capacitance 93 is arranged between drain D and source S.So when the drain D of mos field effect transistor 45 feeds voltage V _DAfter, can between each end points, produce voltage drop.At this moment, the voltage between grid G and source S is V _GS, can learn by following formula (1):

$V_{\mathrm{GS}}=\left(\frac{C_{91}}{{\mathrm{<figure-callout\; id="91"\; label="C"\; filenames="Y20052000450400221.png"\; state="\{\{state\}\}">C</figure-callout>}}_{91}+C_{92}}\right)\&times;V_D---\left(1\right)$

Therefore, when feeding voltage V _DWhen acquiring a certain degree, promptly can produce enough voltage V between the grid G of transistor 45 and source S _GS, being used for driving transistors 45 carries out conducting.

Cooperate Fig. 5, multiple with reference to figure 4, because of transistor 45 has the characteristic of parasitic capacitance, make the utility model second embodiment when power supply unit starts, utilize input voltage source V _INDriving transistors 45 carries out conducting, simultaneously to keeping capacitor C _STCharging.When this keeps capacitor C _STOn voltage when reaching a starting resistor, this first clamper Z ₁With this second clamper Z ₂Can produce collapse, and in this second resistor R ₂Terminal voltage V is set up at two ends _R, terminal voltage V _RMake N transistor npn npn 65 conductings of winning.Can allow a P transistor npn npn 61, the 2nd P transistor npn npn 62, this diverter switch 63 and the also conducting in succession of the 2nd N transistor npn npn 73 after 65 conductings of the one N transistor npn npn.The 2nd N transistor npn npn 73 of conducting transmits the gate terminal of a zero potential to transistor 45, with "off" transistor 45, and then cuts off this input voltage source V _INThis is kept capacitor C _STThe charge path of charging is in order to save the power loss of power supply unit.

Multiple with reference to figure 4, after power supply unit starts,, load end causes auxiliary winding N if being short-circuited _ACan't pass through diode D _AThis is kept capacitor C _STCharging, this moment, the one N transistor npn npn 65 was for ending.Input by first reverser 71 in the amplifying circuit 82 is pulled to earth terminal, and the gate terminal of the input of the output of first reverser 71, second reverser 72 and diverter switch 63 is a high-potential voltage, causes diverter switch 63 to be ended.The output of second reverser 72 is a zero potential, makes that the drain electrode end of the 2nd N transistor npn npn 73 and the gate terminal of transistor 45 are suspension joint.As input voltage V _INContinued power causes power supply unit to begin again to restart.

Cooperate Fig. 4, please refer to Fig. 6, be the starting drive circuit diagram of the utility model the 3rd embodiment.As shown in Figure 6, the employed amplifying circuit of the utility model the 3rd embodiment is except original the 2nd P transistor npn npn 62, first reverser 71, the 3rd resistor R among second embodiment ₃, outside second reverser 72 and the 2nd N transistor npn npn 73, add a boost capacitor (Charge Pump Capacitor) C between input with the gate terminal of this transistor 45 among second embodiment and second reverser 72 ₁, this boost capacitor C ₁Anode be connected to the gate terminal of this transistor 45 and the drain electrode end of the 2nd N transistor npn npn 73, this boost capacitor C ₁Negative terminal be connected to this output of this first reverser 71 and this input of this second reverser 72.And connect a partial pressure unit (divider resistance R _AWith R _BComposition) keeps capacitor C to this _ST

Please refer to Fig. 6, power supply unit utilizes input voltage V when starting _INDriving transistors 45 carries out conducting, simultaneously to keeping capacitor C _STCharging.Explanation by second embodiment learns that the output of first reverser 71 is a driving voltage V of zero potential _X, cause 73 conductings of the 2nd N transistor npn npn by the acting in opposition of second reverser 72.At this moment, keep capacitor C _STOn voltage can divide and be pressed on the divider resistance, because of 73 conductings of the 2nd N transistor npn npn, so the drain terminal voltage of the 2nd N transistor npn npn 73 is identical with source terminal voltage, also identical with the gate terminal voltage of transistor 45 simultaneously (is divider resistance R _BOn voltage).Divider resistance R _BOn voltage begin boost capacitor C ₁Charge, at this moment, the gate terminal voltage of transistor 45 (is divider resistance R _BOn voltage) be lower than its source terminal voltage and (promptly keep capacitor C _STOn voltage), transistor 45 is for ending, and then cuts off this input voltage V _INThis is kept capacitor C _STThe charge path of charging is in order to save the power loss of power supply unit.

Please refer to Fig. 6, after power supply unit starts, cause auxiliary winding N if load end is short-circuited _ACan't pass through diode D _AThis is kept capacitor C _STCharging, this moment, the one N transistor npn npn 65 was for ending.Output by first reverser 71 in the amplifying circuit is the driving voltage V of high potential _X, cause the 2nd N transistor npn npn 73 for ending.The driving voltage V of this high potential _XTo add up boost capacitor C ₁On maximum voltage, make the gate terminal voltage of transistor 45 greater than source terminal voltage, and then quicken and cause transistor 45 conductings, make that power supply unit begins again to restart.

Cooperate Fig. 3, please refer to Fig. 7, be the starting drive circuit diagram of the utility model the 4th embodiment.As shown in Figure 7, the utility model the 4th embodiment omits this transistor 40 among first embodiment, and will be connected to input voltage V _INThis starting resistance R _STMove to be connected to and keep capacitor C _ST, with keep capacitor C _STForm a RC charge-discharge circuit.Other parts circuit composition among the 4th embodiment is identical with the first embodiment circuit that Fig. 3 is disclosed simultaneously, and its circuit operation principle is as follows: input voltage V _INWhen putting on power supply unit, input voltage V _INThis is kept capacitor C _STCharge.When this keeps capacitor C _STOn voltage (this first clamping voltage V when reaching a starting resistor ₁), this first clamper Z ₁With this second clamper Z ₂Can produce collapse, and set up terminal voltage V in these second resistor two ends _R, terminal voltage V _RMake 65 conductings of N transistor npn npn.

Can allow the gate terminal of a P transistor npn npn 61, the output of amplifying circuit 82 and the gate terminal of this diverter switch 63 be connected to earth terminal GND after 65 conductings of N transistor npn npn, and then allowing a P transistor npn npn 61 and the also conducting in succession of this diverter switch 63, a P transistor npn npn 61 of conducting is with the first clamper Z ₁Short circuit allows it lose the voltage clamp effect.Because diverter switch 63 enters conducting, making should auxiliary winding N _ABy this diode D _AThis is kept capacitor C _STThe voltage that provides can offer control circuit 90 by this diverter switch 63 and use.

Multiple with reference to figure 7, this amplifying circuit 82 includes: one the 2nd P transistor npn npn 62, and its gate terminal is connected to the gate terminal of a P transistor npn npn 61, and its source terminal is connected in this and keeps capacitor C _STOne reverser 71, one input end is connected in the drain electrode end of the 2nd P transistor npn npn 62, and an output is connected in the gate terminal of this diverter switch 63; And one the 3rd resistance R ₃, the one end is connected in the drain electrode end of the 2nd P transistor npn npn 62, and the other end is connected in this earth terminal GND.

Moreover, because the first clamper Z ₁By a P transistor npn npn 61 short circuits, therefore should auxiliary winding N _ABy this diode D _AThis is kept capacitor C _STIf the power supply that provides is higher than the second clamping voltage V ₂, 90 of control circuits can work on.Otherwise, if be lower than the second clamping voltage V ₂, this second clamper Z ₂Can can't enter the collapse state, and then the P transistor npn npn 61 of winning, diverter switch 63 and N transistor npn npn 65 are ended in succession.At this moment, control circuit can quit work, and waits for that again this keeps capacitor C _STBe charged to this starting resistor once more, begin to carry out work.

In the above-mentioned explanation, this first clamping voltage V ₁With this second clamping voltage V ₂As a magnetic hysteresis threshold voltage ranges.That is to say that this keeps capacitor C _STOn current potential to be higher than the first clamping voltage V ₁, control circuit 90 begins to start, and current potential will be lower than the second clamping voltage V ₂, control circuit 90 work just can stop.

This amplifying circuit 82 is according to the change action of this N transistor npn npn 65, carrying out the amplification of signal, and then control its switch 63 conductings simultaneously oxide-semiconductor control transistors 40 end.Because diverter switch 63 enters conducting, making should auxiliary winding N _ABy this diode D _AThis is kept capacitor C _STThe power supply that provides can offer control circuit 90 by this diverter switch 63 and use.

In sum, the utility model is after power supply unit begins normal running, can be used to cut off this input voltage this is kept the charge path of electric capacity charging, to save the power loss of power supply unit, simultaneously can improve the power consumption of power supply unit under no-load, and then reach a series of environmental protections (Green mode) specification of the relevant world organization of power supply power supply unit institute's standard under no-load.Starting drive more utilizes the magnetic hysteresis effect simultaneously, the magnetic hysteresis threshold voltage ranges when powering to provide power supply unit to start or stop.

Yet the above, only be the detailed description and the accompanying drawing of one the specific embodiment of the utility model the best, feature of the present utility model is not limited thereto, be not in order to restriction the utility model, all scopes of the present utility model should be as the criterion with following claims, all closing in the embodiment of the spirit variation similar of the utility model claims with it, all should be contained in the category of the present utility model, anyly be familiar with this skill person in field of the present utility model, can think easily and variation or modify and all can be encompassed in following claim of the present utility model.

Claims (17)

1. a starting drive is applied to the startup of power supply unit, is connected to an input voltage source and and keeps electric capacity, it is characterized in that including:

One transistor has one source pole end, a gate terminal and a drain electrode end, and this drain electrode end is connected to this input voltage source, and this source terminal is connected to this and keeps electric capacity;

One start-up control unit has an input and an output, and this input is connected in this and keeps electric capacity and this transistorized source terminal, and this output is connected in this transistorized gate terminal;

One switches switch, is connected in the output of this start-up control unit and this keeps electric capacity;

This input voltage source is controlled this transistor turns thus, and this is kept electric capacity charge, after this start-up control unit is kept electric capacity and is obtained a starting resistor from this, to control this diverter switch conducting, offer control circuit use with the power supply of this being kept on the electric capacity, and control this transistor and end, in order to cut off this input voltage source this is kept the charge path of electric capacity charging.

2. starting drive as claimed in claim 1 is characterized in that, this transistor is a junction field effect transistor.

3. starting drive as claimed in claim 2 is characterized in that, further includes a starting resistance, is connected in the drain electrode end of this input voltage source and this junction field effect transistor.

4. starting drive as claimed in claim 2 is characterized in that, this start-up control unit includes:

One the one P transistor npn npn, its source terminal are connected to this and keep electric capacity and this transistorized source terminal, and gate terminal is connected to this by one first resistance and keeps electric capacity;

One the one N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects an earth terminal;

One first clamper is connected between the source terminal and drain electrode end of a P transistor npn npn;

One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of a N transistor npn npn, and is connected to this earth terminal by one second resistance; And

One amplifying circuit, be connected in a N transistor npn npn drain electrode end, this keeps the gate terminal of electric capacity, this diverter switch and this junction field effect transistor, according to the switching of a N transistor npn npn, to carry out the amplification of signal.

5. starting drive as claimed in claim 4, it is characterized in that, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.

6. starting drive as claimed in claim 4 is characterized in that, this amplifying circuit includes:

One the 2nd P transistor npn npn, its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this source terminal of keeping electric capacity, this diverter switch and this junction field effect transistor;

One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch and this junction field effect transistor; And

One the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal.

7. starting drive as claimed in claim 1 is characterized in that, this transistor is a mos field effect transistor.

8. starting drive as claimed in claim 7 is characterized in that, further includes a starting resistance, is connected in the drain electrode end of this input voltage source and this mos field effect transistor.

9. starting drive as claimed in claim 7 is characterized in that, this start-up control unit includes:

One the one P transistor npn npn, its source terminal are connected to this source terminal of keeping electric capacity and this mos field effect transistor, and gate terminal is connected to this by one first resistance and keeps electric capacity;

One the one N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects an earth terminal;

One first clamper is connected between the source terminal and drain electrode end of a P transistor npn npn;

One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of a N transistor npn npn, and is connected to this earth terminal by one second resistance; And

One amplifying circuit, be connected in a N transistor npn npn drain electrode end, this keeps the gate terminal of electric capacity, this diverter switch and this mos field effect transistor, according to the switching of a N transistor npn npn, to carry out the amplification of signal.

10. starting drive as claimed in claim 9, it is characterized in that, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.

11. starting drive as claimed in claim 9 is characterized in that, this amplifying circuit includes:

One the 2nd P transistor npn npn, its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this source terminal of keeping electric capacity, this diverter switch and this mos field effect transistor;

One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch;

One the 3rd resistor, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this with reference to the ground end;

One second reverser, one input end connects the output of this first reverser; And

One the 2nd N transistor npn npn, its source terminal are connected in this with reference to the ground end, and drain electrode end is connected in the gate terminal of this mos field effect transistor, and gate terminal is connected in the output of this second reverser.

12. starting drive as claimed in claim 9 is characterized in that, this amplifying circuit includes:

One the 2nd P transistor npn npn, its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this source terminal of keeping electric capacity, this diverter switch and this mos field effect transistor;

One first reverser, one input end is connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch;

One the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal;

One second reverser, one input end connects the output of this first reverser;

One the 2nd N transistor npn npn, its source terminal are connected in and are connected to this by a divider resistance and keep electric capacity, and its drain electrode end is connected in the gate terminal of this mos field effect transistor, and its gate terminal is connected in the output of this second reverser; And

One boost capacitor, its anode are connected to the gate terminal of this mos field effect transistor and the drain electrode end of the 2nd N transistor npn npn, and negative terminal is connected to this output of this first reverser and this input of this second reverser.

13. starting drive as claimed in claim 12 is characterized in that, this boost capacitor is used for quickening this mos field effect transistor of conducting when power supply unit restarts.

14. a starting drive is applied to power supply unit, is connected to an input voltage source by a starting resistance, and connects and keep an electric capacity and an auxiliary winding, it is characterized in that including:

-start-up control unit has an input and an output, and this input is connected in this and keeps electric capacity;

One switches switch, is connected in the output of this start-up control unit and this keeps electric capacity;

This input voltage source is kept electric capacity by starting resistance to this and is charged, and this start-up control unit is after keep electric capacity and obtain a starting resistor, and this diverter switch conducting of output control is used to a control circuit so that the power supply of keeping on the electric capacity to be provided.

15. starting drive as claimed in claim 14 is characterized in that, this start-up control unit includes:

One the one P transistor npn npn, its source terminal are connected to this source terminal of keeping electric capacity and this diverter switch, and gate terminal is connected to this by one first resistance and keeps electric capacity;

One N transistor npn npn, its drain electrode end is connected to the gate terminal of a P transistor npn npn, and source terminal then connects one with reference to the ground end;

One first clamper is connected between the source terminal and drain electrode end of a P transistor npn npn;

One second clamper, the one end is connected in the drain electrode end of a P transistor npn npn, and the other end is connected to the gate terminal of N transistor npn npn and is connected to this earth terminal by one second resistance; And

One amplifying circuit, be connected in this N transistor npn npn drain electrode end, this keeps the gate terminal of electric capacity and this diverter switch, according to the switching of this N transistor npn npn, to carry out the amplification of signal.

16. starting drive as claimed in claim 15, it is characterized in that, this first clamper and this second clamper are kept the rising of electric capacity current potential and collapse in succession according to this, and then produce one first clamping voltage and one second clamping voltage as a magnetic hysteresis threshold voltage ranges.

17. starting drive as claimed in claim 15 is characterized in that, this amplifying circuit includes:

One the 2nd P transistor npn npn, its gate terminal is connected to the gate terminal of a P transistor npn npn, and its source terminal is connected in this and keeps electric capacity, this diverter switch and this transistorized source terminal;

One reverser, one input end are connected in the drain electrode end of the 2nd P transistor npn npn, and an output is connected in the gate terminal of this diverter switch; And

One the 3rd resistance, the one end is connected in the drain electrode end of the 2nd P transistor npn npn, and the other end is connected in this earth terminal.

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