CN1870410A - Electric power unit of switch - Google Patents
Electric power unit of switch Download PDFInfo
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- CN1870410A CN1870410A CNA2005101192118A CN200510119211A CN1870410A CN 1870410 A CN1870410 A CN 1870410A CN A2005101192118 A CNA2005101192118 A CN A2005101192118A CN 200510119211 A CN200510119211 A CN 200510119211A CN 1870410 A CN1870410 A CN 1870410A
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Abstract
The invention provides instable behavioral power switching equipment that can restrain power factor, improve circuit and control switch circuit. There into, the powder factor improving stable work of circuit, controlling circuit in the ascend process of alternating input voltage, when rectifier pulsation voltage reaching to more than driving trigger voltage (VF1) of stable working voltage (VSF) which set to improve circuit, sufficiently stable work by powder factor, making the powder factor improving circuit and starting work. The stable operating control work of control swift is also in the ascend process of alternating input voltage, when rectifier smooth voltage reaching to more than driving trigger voltage (VF1) of stable working voltage (VSF) which set to stable the work of the control switch circuit, making the control switch circuit start to work.
Description
Technical field
The present invention relates to have AC-input voltage is carried out rectification and produced the rectification circuit of rectified pulsatory voltage, the described rectified pulsatory voltage of peak time tracking that produces higher harmonic current and make this higher harmonic current according to described rectified pulsatory voltage is to carry out the power factor improvement circuit of power factor improvement, output voltage to described power factor improvement circuit carries out rectification and makes it smoothly to produce the rectification smoothed filter circuit of rectification smooth voltage, and described rectification smooth voltage switched switching power unit with the total switch circuit that produces ac output voltage.
Background technology
(COSEL CO. in power-supply device LTD) (POWER SUPPLIES) the 2003/2004 year product catalogue (non-patent literature 1), discloses this switching power unit with rectification circuit, power factor improvement circuit and total switch circuit in COSEL company.
Fig. 5 is the circuit block diagram of the switching power circuit of this catalogue announcement.This switching power unit has rectification circuit 4, power factor improvement circuit 5, rectification smoothed filter circuit 7 and total switch circuit 8.Rectification circuit 4 produces AC-input voltage V1 is carried out the rectified pulsatory voltage Va that obtains after the full-wave rectification.
Power factor improvement circuit 5, detects the voltage detecting circuit 53 of rectified pulsatory voltage Va, the voltage detecting circuit 55 that detects the current detection circuit 54 of the high-frequency current that flows through booster circuit 51 and detect the rectification smooth voltage Vb of self-rectifying smoothed filter circuit 7 at the power factor (PF) control device 52 that have booster circuit 51 that the rectified pulsatory voltage Va that makes self-rectifying circuit 3 boosts, makes booster circuit 51 carry out high frequency to switch.This power factor improvement circuit 5 utilizes 52 pairs of booster circuits 51 of power factor improvement () means to switch, make current detection circuit 54 detected high frequent current peaks floating voltage testing circuit 53 detected rectified pulsatory voltage Va, and make the phase place of the peak envelope line waveform of the high-frequency current that flows through booster circuit 51, thereby improve power factor (PF) near rectified pulsatory voltage Va.The output voltage V 2 of boosting after 7 pairs of booster circuits 51 of rectification smoothed filter circuit boost is carried out rectification, and produces rectification smooth voltage Vb.
Total switch circuit 8, have the inverter circuit 81 that receives the rectification smooth voltage Vb that rectification smoothed filter circuit 81 supplies with, the switch transformer 82 that connects this inverter circuit 81, make from inverter circuit 81 with the controlled load rate and flow to the switch control means 84 of current switching of switch transformer 82 and the current detection circuit 83 that detects the electric current that flows to switch transformer 82, and produce ac output voltages by switch transformer 82.
As shown in Figure 6, in the existing switching power unit shown in Fig. 5, come the rectified pulsatory voltage Va of self-rectifying circuit 4 to reach and be not less than the stable operating voltage VSF that makes power factor improvement circuit 5 abundant steady operations, then power factor improvement circuit 5 carries out work with steady-working state, but in the uphill process of AC-input voltage V1, before rectified pulsatory voltage Va reaches stable operating voltage VSF, power factor improvement circuit 5 intermittently repeats to start, the instability action U1 that stops, and in the decline process of AC-input voltage V1, also be reduced to when not being higher than stable operating voltage VSF at rectified pulsatory voltage Va, same instability action U2 takes place in power factor improvement circuit 5.
Equally, as shown in Figure 6, come the rectification smooth voltage Vb of self-rectifying smoothed filter circuit 7 to reach and be not less than the stable operating voltage VSM that makes total switch circuit 8 abundant steady operations, then total switch circuit 8 carries out work with steady-working state, but in the uphill process of AC-input voltage V1, before rectification smooth voltage Vb reaches stable operating voltage VSM, total switch circuit 8 intermittently repeats to start, the instability action U3 that stops, and in the decline process of AC-input voltage V1, also be reduced to when not being higher than stable operating voltage VSM at rectification smooth voltage Vb, same instability action U4 takes place in total switch circuit 8.
Power factor improvement circuit 5 and total switch circuit 8 are according to the composition of power factor (PF) control device 52 and switch control means 84, the a certain side of these two circuit is subjected to first startup than the opposing party, thereby this a certain side's unstable operation causes the opposing party's unstable operation, the result makes the ac output voltage instability of total switch circuit 8, and load is subjected to bad influence.
Hinder for some reason at power factor improvement circuit 5 and to wait and under idle situation, the action of the instability of total switch circuit 8 U3, U4 also make load be subjected to bad influence.
The object of the invention is: the switching power unit that proposes a kind of total switch circuit job insecurity that can prevent that the power factor improvement circuit working is unstable and bring.
The object of the invention is again: propose a kind ofly to hinder for some reason etc. at the power factor improvement circuit and also can prevent the improved switching power unit of total switch circuit job insecurity under idle situation.
Summary of the invention
The switching power unit of the present invention's the 1st viewpoint, have: AC-input voltage is carried out rectification and produced the rectification circuit of rectified pulsatory voltage, the peak time tracking rectified pulsatory voltage that produces higher harmonic current and make this higher harmonic current according to rectified pulsatory voltage is to carry out the power factor improvement circuit of power factor improvement, output voltage to the power factor improvement circuit carries out rectification and makes it smoothly to produce the rectification smoothed filter circuit of rectification smooth voltage, and the rectification smooth voltage switched to produce the total switch circuit of ac output voltage, also have steady operation control circuit to the power factor improvement circuit; This to the steady operation control circuit of power factor improvement circuit in the uphill process of AC-input voltage, rectified pulsatory voltage reaches when setting the driving starting resistor VF1 that is not less than the stable operating voltage VSF that makes the abundant steady operation of power factor improvement circuit for, and the power factor improvement circuit is started working.
The switching power unit of the present invention's the 2nd viewpoint is in the switching power unit of described the 1st viewpoint, also has the steady operation control circuit to described total switch circuit; This to the steady operation control circuit of total switch circuit in the uphill process of AC-input voltage, the rectification smooth voltage reaches when setting the driving starting resistor VM1 that is not less than the stable operating voltage VSM that makes the abundant steady operation of described total switch circuit for, and total switch circuit is started working.
The switching power unit of the present invention's the 1st viewpoint, has steady operation control circuit to the power factor improvement circuit, this steady operation control circuit is in the uphill process of AC-input voltage, rectified pulsatory voltage reaches when setting the driving starting resistor VF1 that is not less than the stable operating voltage VSF that makes the abundant steady operation of power factor improvement circuit for, the power factor improvement circuit is started working, thereby can prevent power factor improvement circuit working instability, the total switch circuit job insecurity that this power factor improvement circuit working instability is brought can also be prevented, of the bad influence of this job insecurity can be prevented load.
The switching power unit of the present invention's the 2nd viewpoint, also has steady operation control circuit to total switch circuit, this to the steady operation control circuit of total switch circuit in the uphill process of AC-input voltage, the rectification smooth voltage reaches when setting the driving starting resistor VM1 that is not less than the stable operating voltage VSM that makes the abundant steady operation of described total switch circuit for, total switch circuit is started working, thereby prevent the total switch circuit job insecurity, and when the power factor improvement fault, also can prevent the total switch circuit job insecurity, can prevent of the bad influence of this job insecurity load.
Description of drawings
Fig. 1 is the circuit block diagram that switching power unit execution mode 1 of the present invention is shown.
Fig. 2 is the physical circuit figure of execution mode 1.
Fig. 3 is the job description figure of the power factor improvement circuit of execution mode 1.
Fig. 4 is the job description figure of the switching power unit of execution mode 1.
Fig. 5 is the circuit block diagram of existing switching power unit.
Fig. 6 is the action specification figure of existing switching power unit.
Label declaration
The 4th, rectification circuit, the 5th, the power factor improvement circuit, the 51st, booster circuit, the 52nd, the power factor (PF) control device, the 53rd, voltage detecting circuit, the 54th, current detection circuit, the 6th, the steady operation control circuit of power factor improvement circuit, the 61st, the voltage decision circuitry, the 62nd, drive circuit, the 7th, rectification smoothed filter circuit, the 8th, total switch circuit, the 81st, inverter circuit, the 82nd, switch transformer, the 84th, switch control means, the 9th, the steady operation control circuit of total switch circuit, the 91st, voltage decision circuitry, the 92nd, drive circuit.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
Execution mode 1
Fig. 1 is the circuit block diagram that switching power unit execution mode 1 of the present invention is shown, and Fig. 2 is its physical circuit figure.The switching power unit of execution mode 1 has AC input terminal 1, fuse 2, line filter 3, rectification circuit 4, power factor improvement circuit 5, the steady operation control circuit 6 to the power factor improvement circuit, rectification smoothed filter circuit 7, total switch circuit 8 and to the steady operation control circuit 9 of total switch circuit.
This switching power unit carries out full-wave rectification with 4 couples of AC-input voltage V1 that supply with AC input terminal 1 of rectification circuit, and produces rectified pulsatory voltage Va on the lead-out terminal of this rectification circuit 4.Carry out high frequency by the pairing electric current of 5 pairs of these rectified pulsatory voltage of power factor improvement circuit Va and switch, thereby produce high-frequency current Ia.Make the peak time tracking rectified pulsatory voltage Va of this high-frequency current Ia, carry out power factor improvement and boost, and produce the output voltage V 2 of boosting.The output voltage V 2 of boosting with 7 pairs of these power factor improvement circuit 5 of rectification smoothed filter circuit is carried out rectification, and produces rectification smooth voltage Vb.Switch this rectification smooth voltage Vb by total switch circuit 8, thereby produce ac output voltage V3, V4, and with its supply load.
The switching power unit of present embodiment 1, be applied to various loads power circuit, to the power amplification power circuit of various loads, to the power amplification power circuit of the automatic tension control device of the tension state of overlength materials such as automatic control paper, film and electric wire or to carry out the power amplification power circuit of the manual tenslator that Tension Control uses with manual mode.In these power circuits, can adjust the magnitude of voltage of ac output voltage V3, V4 by the break-make load factor of control total switch circuit 8.For example, in the power amplification power circuit to automatic tension control device or manual tenslator, control the tension force of overlength material by the magnitude of voltage of adjusting ac output voltage V3, V4.
AC input terminal 1 for example is connected to the mains ac power supply, supplies with AC-input voltage V1.The load voltage value of this AC-input voltage V1 is 85V～264V, and its frequency is 50Hz～60Hz, adapts to the mains ac power supply rated value of countries in the world.
Rectification circuit 4 is connected AC input terminal 1 by fuse 2 with line filter 3, and produces rectified pulsatory voltage Va.Rectification circuit 4 is single phase rectifier circuits, and rectified pulsatory voltage Va is the single-phase full wave commutating voltage.Specifically, as shown in Figure 2, rectification circuit 4 has positive side lead-out terminal 4a and minus side lead-out terminal 4b, and minus side lead-out terminal 4b connects reference potential point (promptly).Between positive side lead-out terminal 4a and minus side lead-out terminal 4b, produce rectified pulsatory voltage Va.This rectified pulsatory voltage Va is 85V～264V.
Power factor improvement circuit 5 connects the positive side lead-out terminal 4a and the minus side lead-out terminal 4b of rectification circuit 4, to receive rectified pulsatory voltage Va.This power factor improvement circuit 5 comprises booster circuit 51, power factor (PF) control device 52, voltage detecting circuit 53, current detection circuit 54 and voltage detecting circuit 55.Specifically, as shown in Figure 2, booster circuit 51 has step-up coil 511, ancillary coil 512 and boosted switch element 513.Ancillary coil 512 is included in the step-up coil 511, and one end ground connection.Step-up coil 511 is connected between sub-4a of dc output end and the rectification smoothed filter circuit 7, boosted switch element 513 is connected to the circuit of the tie point ground connection that makes step-up coil 511 and rectification smoothed filter circuit 2.This boosted switch element 513 is made of for example P channel power MOS FET (MOS (metal-oxide-semiconductor) memory), and its drain D connects an end of step-up coil 511.
As shown in Figure 2, power factor (PF) control device 52 has the driving power circuit 522 of power factor (PF) control IC 521 and this power factor (PF) control IC 521.Power control IC 521 has driving power terminal VCC, lead-out terminal OUT, electric current side input terminal IS, voltage side input terminal MUL, feedback terminal FB, the work sub-COMP in control input end and ground terminal GND.Driving power terminal VCC connects driving power circuit 522, receives the supply of driving power voltage VFD from this driving power circuit 522.Lead-out terminal OUT connects the grid G of boosted switch element 513, drives boosted switch element 513, makes its conducting or blocking-up.Voltage side input terminal MUL connects voltage detecting circuit 53, imports the voltage signal Sva that is directly proportional with rectified pulsatory voltage Va from this voltage detecting circuit 53.Electric current side input terminal IS connects current detection circuit 54, imports the current signal Sia that is directly proportional with the high-frequency current Ia that flows through step-up coil 511 from this current detection circuit 54.
Driving power circuit 522 shown in Figure 2 comprises resistance 5221, smmothing capacitor 5222, resistance 5223, capacitor 5224, rectifier diode 5225, Zener diode 5226 and resistance 5227.Resistance 5221 and smmothing capacitor 5222 are connected between the positive side lead-out terminal 4a and ground of rectification circuit 4 mutually.The direct ground connection of one end of this resistance 5221.The two ends of smmothing capacitor 5222 produce the driving power voltage VFD that is directly proportional with rectified pulsatory voltage Va, and with the driving power terminal VCC of this driving power voltage VFD supply power controlling factors IC521.
Resistance 5223, capacitor 5224, rectifier diode 5225, Zener diode 5226 and resistance 5227 are connected on mutually between the non-earth terminal and ground of ancillary coil 512.One end of resistance 5223 directly connects the non-earth terminal of ancillary coil 512, and the other end of this resistance 5223 connects capacitor 5224, connects the anode of rectifier diode 5225 on this capacitor 5224.The negative electrode C of rectifier diode 5225 connects the negative electrode C of Zener diode 5226, and the anode A of Zener diode 5226 is by resistance 5227 ground connection.Rectifier diode 5225 is after the work of the control IC 521 of boosting begins, and according to the break-make of boosted switch element 513, the alternating voltage that auxiliary capacitor 512 is produced carries out rectification, to strengthen driving power voltage VFD.
The negative electrode C of the tie point of resistance 5221 and smmothing capacitor 5222 and Zener diode 5226 is connected to the driving power terminal VCC of power factor (PF) control IC 521, to the driving power voltage VFD of this driving voltage () terminal VCC supply power controlling factors IC (521).Zener diode 5226 has the Zener voltage VZ1 of regulation, be elevated at driving power voltage VFD and puncture when being equal to or greater than this Zener voltage VZ1, make driving power voltage VFD keep being equal to or greater than Zener voltage VZ1, specifically, the voltage that obtains after with the voltage addition on this Zener voltage VZ1 and the resistance 5227 of maintenance.Keep being equal to or greater than under the state of Zener voltage VZ1 at driving power voltage VFD, the power factor (PF) control IC 521 of power factor improvement circuit 5 is carried out stable work.Rectified pulsatory voltage Va when driving power voltage VFD reaches Zener voltage VZ1 is stable operating voltage VSF.
As shown in Figure 2, voltage detecting circuit 53 specifically comprises capacitor 531 and 2 resistance 532,533.Capacitor 531 is connected between the positive side lead-out terminal 4a and ground of rectification circuit 4,2 532,533 of resistance are connected between two terminals of this capacitor 531 mutually.This resistance 532 and the tie point of resistance 533 are connected to the voltage side input terminal MUL of power factor (PF) control IC 521.Tie point at resistance 532 and resistance 533 produces the voltage signal Sva that is directly proportional with rectified pulsatory voltage Va, and with the voltage side input terminal MUL of this voltage signal Sva supply power controlling factors IC521.
Specifically, as shown in Figure 2, current detection circuit 54 is made of resistance 541.This resistance 541 is connected between the source S and ground of boosted switch element 513, produces the current signal Sia that is directly proportional with the high-frequency current Ia that flows through step-up coil 511.The resistance 541 and the tie point of boosted switch element 513 are connected to the electric current side input terminal IS of power factor (PF) control IC 521, to this electric current side input terminal IS supplying electric current signal Sia.
Specifically, as shown in Figure 2, voltage detecting circuit 55 has 2 resistance 551,552 on the lead-out terminal 7a that is connected on rectification smoothed filter circuit 7 mutually.The tie point of this resistance 551 and 552 is connected to the feedback terminal FB of power factor (PF) control IC 521.Produce the feedback voltage signal Sfv that is directly proportional with rectification smooth voltage Vb on the tie point of resistance 551 and resistance 552, and with the feedback terminal FB of this feedback voltage signal Sfv supply power controlling factors IC521.
As shown in Figure 2, the inside of power factor (PF) control IC 521 comprises driving comparator 5211, control comparator 5212, mlultiplying circuit 5213 and reference power supply 5214.Drive comparator 5211 and have positive side input a, minus side input b and output c.This minus side input b that drives comparator 5211 connects voltage side input terminal MUL by mlultiplying circuit 5213.This mlultiplying circuit 5213 produces multiplication coefficient K, and formation can utilize the control voltage VF of the sub-COMP in work control input end to adjust this multiplication coefficient K.Mlultiplying circuit 5213 makes the voltage signal Sva of service voltage side input terminal MUL become multiplication output K * Sva, and it is supplied with the minus side input b that drives with comparator 5211.Positive side input a is connected electric current side input terminal IS, from current detection circuit 54 received current signal Sia.
Fig. 3 is the job description figure that drives comparator 5211.Multiplication output K * Sva of minus side input b is supplied with in curve C 1 expression of Fig. 3, and the current signal Sia of positive side input a is supplied with in curve C 2 expressions.Multiplication shown in the curve C 1 of Fig. 3 output K * Sva earth pulsation that is directly proportional with rectified pulsatory voltage Va.Rectified pulsatory voltage Va is the single-phase full wave commutating voltage of AC-input voltage V1, multiplication output K * Sva earth pulsation that also is directly proportional with rectified pulsatory voltage Va.
If the current signal Sia that arrives the positive side input a that drives comparator 5211 is less than the multiplication output K * Sva that arrives its minus side input b, output c just becomes high level, and the grid G of the boosted switch element 513 of booster circuit 51 is supplied with this high level output, thereby 513 conductings of boosted switch element, the high-frequency current Ia that flows through step-up coil 511 increases.The increase of this high-frequency current Ia also increases current signal Sia, and when this current signal Sia increased to the value identical with multiplication output K * Sva, output c became low level, makes the grid G of boosted switch element 513 become low level, thereby switch element 513 blocking-up, cut off high-frequency current Ia.As a result, high-frequency current Ia reduces, and current signal Sia also reduces.When this current signal Sia was reduced to certain value, output c became high level once more, makes 513 conductings of boosted switch element, and high-frequency current Ia strengthens once more.
Drive comparator 5211 and repeat above action, the high-frequency drive boosted switch element 513 with 100kHz～200kHz makes its break-make, thereby flows through the dither of the high-frequency current Ia of step-up coil 511 with 100kHz～200kHz.Because current signal Sia is subjected to multiplication output K * Sva to suppress the peak time tracking rectified pulsatory voltage Va of this high-frequency current Ia.Therefore, the pulsation of the peak time tracking rectified pulsatory voltage Va of high-frequency current Ia roughly in phase changes with this rectified pulsatory voltage Va, improves the power factor (PF) of switching power unit.Because step-up coil 511 circulation high-frequency current Ia, step-up coil 511 produces the output voltage V 2 of boosting.This output voltage V 2 of boosting equals 380V～410V.
As shown in Figure 2, together with driving comparator 5211, the also built-in control comparator 5212 of power factor (PF) control IC 521.This control comparator 5212 has positive side input d, minus side input e and output f.Align the feedback voltage signal Sfv of side input d supply, to the reference voltage signal Sref of minus side input e supply from reference power supply 5214 from voltage detecting circuit 55.To export f and be connected to sub-COMP in work control input end and mlultiplying circuit 5213, to adjust the multiplication coefficient K of mlultiplying circuit 5213.This control comparator 5212 is adjusted the multiplication coefficient K of mlultiplying circuit 5213, boost output voltage V 2 and the rectification smooth voltage Vb of booster circuit 51 are adjusted to setting, make feedback voltage signal Sfv equal reference voltage signal Sref from voltage detecting circuit 55.
7 pairs of output voltage V 2 of boosting from power factor improvement circuit 5 of rectification smoothed filter circuit are carried out rectification, and make it level and smooth, thereby produce rectification smooth voltage Vb.This rectification smooth voltage Vb equals 380V～410V.As shown in Figure 2, rectification smoothed filter circuit 7 specifically comprises rectifier diode 71 and smmothing capacitor 72.The lead-out terminal 7a of rectification smoothed filter circuit 7 is negative electrodes of rectifier diode 71.The anode A of rectifier diode 71 is connected an end of the step-up coil 511 of booster circuit 51, and its negative electrode C is then by smmothing capacitor 72 ground connection.Produce rectification smooth voltage Vb at the two ends of smmothing capacitor 72.
Total switch circuit 8 has inverter circuit 81, switch transformer 82, current detection circuit 83 and switch control means 84.Specifically, as shown in Figure 2, inverter circuit 81 has master switch element 811, and this master switch element 811 makes periodically break-make of rectification smooth voltage Vb with in check load factor.Constitute this master switch element 811 with for example P channel power MOS FET.
Say that specifically as shown in Figure 2, switch transformer 82 has 821,2 output windings 822 of input coil and 823 and control power coil 824, these coils respectively on common iron core, inductance coupling high mutually.One end of input coil 821 is connected the lead-out terminal 7a of rectification smoothed filter circuit 7, and the other end connects the drain D of master switch element 811.Current detection circuit 83 has resistance 831, and this resistance 831 is connected to the circuit of the source S ground connection that makes master switch element 811.Produce the current signal Sib that is directly proportional with the master switch current Ib that flows through master switch element 811 on the tie point of this resistance 831 and the source S of master switch element 811.
Each output winding 822,823 of switch transformer 82 produces ac output voltage V3, V4 according to the break-make of master switch element 811, by rectifier diode 825,826 respectively to after this ac output voltage V3, the V4 rectification, with its supply load.By adjusting the break-make load factor of master switch element 811, adjust the size of ac output voltage V3, V4.The control power coil 824 of switch transformer 82 is used alternating voltage V5 according to the break-make generation control of master switch element 811, should control alternating voltage V5 rectification by rectifier diode 827.
Switch control means 84 has switch control IC 841, starting resistance 842, Zener diode 843 and resistance 844.Switch control IC 841 has driving power terminal VCC, drive signal lead-out terminal OUT, clamp terminal CLM and ground terminal GND.Driving power terminal VCC receives the supply of driving power voltage VMD by the lead-out terminal 7a of starting resistance 842 connection rectification smoothed filter circuits 7.This driving power voltage VMD is directly proportional with rectification smooth voltage Vb.Driving power terminal VCC connects the negative electrode C of rectifier diode 827, after switch control IC 841 is started working, with rectifier diode 842 () control is strengthened driving power voltage VMD with the voltage that obtains after the alternating voltage V5 rectification.
The anode A of Zener diode 843 is by resistance 844 ground connection, and its negative electrode C then connects the driving power terminal VCC of switch control IC 841.This Zener diode 843 has Zener voltage VZ2, when being equal to or greater than this Zener voltage VZ2, driving power voltage VMD punctures, make driving power voltage VMD keep being equal to or greater than Zener voltage VZ2, specifically keep Zener voltage VZ2 to add the voltage that obtains behind the voltage on the resistance 844.Keep being equal to or greater than under the state of Zener voltage VZ2 at driving power voltage VMD, switch control IC 841 is carried out steady operation, thereby total switch circuit 8 carries out steady operation.Rectification smooth voltage Vb when driving power voltage VFD reaches Zener voltage VZ2 is stable operating voltage VSM.
Switch control IC 841 produces the drive signal VDR of in check load factor on drive signal lead-out terminal OUT, and this drive signal VDR is supplied with the grid G of master switch element 811, drive this master switch element 811, make it carry out break-make with in check load factor.To be connected to clamp terminal CLM from the current signal Sib of current detection circuit 831, and, drive signal VDR be stopped, with protection master switch element 811 if this current signal Sib is excessive.
Steady operation control circuit 6 to the power factor improvement circuit of feature of the present invention describes.As indicated above, the power factor (PF) control IC 521 of power factor improvement circuit 5 receives the supply of driving power circuit 522 according to the driving power voltage VFD of the rectified pulsatory voltage Va generation of rectification circuit 4 outputs, thereby carries out work.This driving power voltage VFD is directly proportional with rectified pulsatory voltage Va, and power control IC 521 is carried out steady operation when driving power voltage VFD reaches the Zener voltage VZ1 that is equal to or greater than Zener diode 5226.Rectified pulsatory voltage when driving power voltage VFD reaches Zener voltage VZ1 is stable operating voltage VSF, and this stable operating voltage VSF is for example 60V.
The steady operation control circuit 6 of power factor improvement circuit 5 () is not more than work starting resistor VF1 and the work that the voltage range of the stable operating voltage VSF of this power factor improvement circuit 5 sets power factor improvement circuit 5 and stops voltage VF2 at the rectified pulsatory voltage Va that comes self-rectifying circuit 4.This work starting resistor VF1 is stopped voltage VF2 with work set satisfied following relational expression (1) for.
VF1＞VF2＞VSF ……(1)
Specifically, when stable operating voltage VSF was 60V, the starting resistor VF1 that will work set for example 75V for, and work stops voltage VF2 and sets 70V for.
6 pairs of power factor improvement circuit 5 of the steady operation control circuit of power factor improvement circuit 5 have voltage decision circuitry 61 and drive circuit 62.At first, voltage decision circuitry 61 is in the uphill process that the rectified pulsatory voltage Va that AC input terminal 1 is connected rectification circuit 4 behind the AC-input voltage V1 rises, judge that this rectified pulsatory voltage Va reaches work starting resistor VF1 (for example 75V), or in the decline process that rectified pulsatory voltage descends after cutting off AC-input voltage V1, judge that rectified pulsatory voltage Va reaches work and stops voltage VF2 (for example 70V).This voltage decision circuitry 61 comprises resistance 611, resistance 612, control switch element 613, resistance 614 and Zener diode 615.
Resistance 611 and resistance 612 are connected between the positive side lead-out terminal 4a and ground of rectification circuit 4 mutually.One end of resistance 611 directly connects positive side lead-out terminal 4a, the direct ground connection of an end of resistance 612.This resistance 611 and 612 bleeder circuits that constitute rectified pulsatory voltage Va, the branch pressure voltage VS1 of generation rectified pulsatory voltage Va.
Constitute control switch element 613 with for example P channel mosfet, its grid G connects the tie point of resistance 611 and resistance 612, to receive the supply of branch pressure voltage VS1.The drain D of control switch element 613 is passed through the lead-out terminal 7a that resistance 614 connects rectification smoothed filter circuits 7, the then direct ground connection of its source S.Zener diode 615 is connected between the grid G and negative electrode S of control switch element 613, connects source S, when receiving excessive branch pressure voltage VS1, puncture with the polarity that connects anode A, thus protection control switch element 613.
The characteristic that control switch element 613 has is: be in blocking state usually, when the branch pressure voltage VS1 that is added to its grid G is elevated to gate-on voltage Von1, switch to conducting state from blocking state, when branch pressure voltage VS1 is reduced to grid blocking voltage Voff1, return to blocking state then from conducting state.Gate-on voltage Von1 is higher than grid blocking voltage Voff1.Gate-on voltage Von1 sets work starting resistor VF1, and grid blocking voltage Voff1 setting work stops voltage VF2.
The control switch element 613 of voltage decision circuitry 61 is in blocking state usually.Therefore, in the uphill process that AC-input voltage V1 rises after connecting AC-input voltage V1, when the rectification smooth voltage Vb of the lead-out terminal 7a of rectification smoothed filter circuit 7 slightly raises, electric current according to circulation resistance 614,622 and resistance 623, grid generation at driving switch element 621 makes driving switch element 621 be the voltage of conducting state, thereby driving switch element 621 becomes conducting state.Under the conducting state of this driving switch element 621, the control voltage VF of the sub-COMP in work control input end of power factor (PF) control IC 521 is substantially equal to earth potential (0V), this state is controlled to non operating state with power factor (PF) control IC 521.Under the non operating state of this power factor (PF) control IC 521, the multiplication coefficient K of the mlultiplying circuit 5213 of power factor (PF) control IC 521 is 0, even voltage signal Sva strengthens, the minus side input b that drives comparator 5211 also keeps 0 current potential, thereby its output c also keep low level, make boosted switch element 513 keep blocking state.
In the uphill process of rectified pulsatory voltage Va, when this rectified pulsatory voltage Va reaches work starting resistor VF1 (for example 75V), branch pressure voltage VS1 becomes the gate-on voltage Von1 that is not less than control switch element 613, makes this control switch element 613 switch to conducting state from blocking state.Thereupon, the grid voltage of driving switch element 621 is reduced to roughly 0 current potential, thereby driving switch element 621 switches to blocking state from conducting state.As a result, make the sub-COMP in work control input end of power factor (PF) control IC 521 break away from earth potential, thereby mlultiplying circuit 5213 is input to the negative input b that drives comparator 5211 with the output that voltage signal Sva multiply by multiplication coefficient K.Under this state, drive the high-frequency drive boosted switch element 513 of comparator 5211, thereby boost output V2 and the rectification smooth voltage Vb of booster circuit 51 are elevated to 380V～410V fast with 100kHz～200kHz.
Starting resistor VF1 (for example 75V) sets the stable operating voltage VSF (for example 60V) that is equal to or greater than power factor (PF) control circuit (6) for owing to will work, when the result makes power factor (PF) control IC 521 start work with work starting resistor VF1, power factor improvement circuit 5 sharply switches to steady-working state from non operating state, begin to carry out steady operation, such in the past instability action does not take place.
Again, in rectified pulsatory voltage decline process, when the rectified pulsatory voltage Va work of being reduced to stops voltage VF2 (for example 70V), branch pressure voltage VS1 is reduced to the grid blocking voltage Voff1 of control switch element 613, thereby this control switch element 613 switches to blocking state from conducting state, recover blocking state, make driving switch element 621 recover conducting state, the current potential of the sub-COMP in work control input end of power factor (PF) control IC 521 is reduced to generally current potential, the multiplication coefficient K of mlultiplying circuit 5213 is reduced to 0, so the work of power factor improvement circuit 5 stops.
Because work is stopped voltage VF2 (for example 70V) sets the stable operating voltage VSF (for example 60V) that is equal to or greater than power factor (PF) control circuit (6) for, when the result stops voltage VF2 power factor (PF) control IC 521 is quit work with work, power factor improvement circuit 5 sharply switches to from steady operation and quits work, and work is stopped and the action of such in the past instability does not take place.
Work is stopped voltage VF2 set, and lagging characteristics is set between them less than work starting resistor VF1.Therefore, setting work stops voltage VF2, although make power factor improvement circuit 5 start work with work starting resistor VF1, electric current is in these circuit 5 circulations, and rectified pulsatory voltage Va reduces, do not cause rectified pulsatory voltage Va to be reduced to the work of being not more than yet and stop voltage VF2, thereby can eliminate power factor improvement circuit 5 job insecurities reliably.
The existing circuit of not establishing steady operation control circuit 6 is in the uphill process of rectified pulsatory voltage Va, this voltage Va reaches for example stage of 40V reach the stable operating voltage VSF of power factor improvement circuit 5 from rectified pulsatory voltage Va before, along with the rising of driving power voltage VFD, the 521 startup work of power factor (PF) control IC.Because voltage signal Sva strengthens with rectified pulsatory voltage Va with being directly proportional during this startup work, the output c that drives comparator 5211 becomes high level, makes 513 conductings of boosted switch element, and the electric current that flows through boosted switch element 513 strengthens.Yet, when flowing through the electric current increasing of boosted switch element 513, cause rectified pulsatory voltage Va to reduce, power factor (PF) control IC 521 out-of-work once more unstable action U1 (Fig. 6 (b)) take place.
The existing circuit of not establishing steady operation control circuit 6 is in the decline process of rectified pulsatory voltage Va, the stable operating voltage VSF and this voltage Va that are lower than power factor improvement circuit 5 from rectified pulsatory voltage Va are reduced to for example stage of 30V, along with the reduction of driving power voltage VFD, power factor (PF) control IC 521 quits work.Quitting work when the electric current that flows through boosted switch element 513 is reduced of this power factor (PF) control IC 521, rectified pulsatory voltage Va raises once more, and power factor (PF) control IC 521 out-of-work once more unstable action U2 (Fig. 6 (b)) take place.
Steady operation control circuit 6 of the present invention is with the work of the work starting resistor VF1 starting power controlling factors IC521 of the stable operating voltage VSF that is not less than power factor improvement circuit 6, and stop voltage VF2 with the work that is not less than this stable operating voltage power factor (PF) control IC road 521 is quit work, thereby can eliminate the such instability action of circuit in the past.Can eliminate total switch circuit 8 causes unstable action along with power factor improvement circuit 5 job insecurities defective again.
Fig. 4 is the job description figure of the switching power unit of execution mode 1.Fig. 4 (a) illustrates the variation of rectified pulsatory voltage Va, Fig. 4 (b) illustrates the variation of the control voltage VF of the power factor (PF) control IC 521 of following this variation, Fig. 4 (c) illustrates the variation of the rectification smooth voltage Vb that follows this voltage Va variation, and Fig. 4 (d) illustrates the variation of the driving power voltage VMD of the switch control IC 841 of following this variation.
From Fig. 4 (a) and (b) as can be known, in the uphill process of rectified pulsatory voltage Va, when this rectified pulsatory voltage Va surpasses the stable operating voltage VSF of power factor improvement circuit 5 and reaches work starting resistor VF1, control voltage VF to power factor (PF) control IC 521 sharply strengthens, thereby power factor improvement circuit 5 carries out steady operation, and unstable action does not take place; In the rectified pulsatory voltage Va decline process, when the work that this voltage Va reaches the stable operating voltage VSF that is not less than power factor improvement circuit 5 stops voltage VF2, the control voltage VF of power factor (PF) control IC 521 sharply is reduced to is roughly earth potential, thereby work is stopped, unstable action does not take place in power factor improvement circuit 5.
Then, steady operation control circuit 9 as the total switch circuit 8 of feature of the present invention is described.As indicated above, the switch control IC 841 of total switch circuit 8 is carried out work according to the driving power voltage VMD that is directly proportional with rectification smooth voltage Vb.When this switch control IC 841 is not less than stable operating voltage VSM at rectification smooth voltage Vb, carry out work, make total switch circuit 8 steady operations with stable state.This stable operating voltage VSM is for example 40V～50V.
The steady operation control circuit 9 of total switch circuit 8 is not less than the voltage range of the stable operating voltage VSM of this total switch circuit 8 at the rectification smooth voltage Vb that comes self-rectifying smoothed filter circuit 7, and work starting resistor VM1 and the work set total switch circuit 8 stop voltage VM2.This work starting resistor VM1 and work are stopped the relation that voltage VM2 sets the formula (2) below satisfying for.
VM1＞VM2＞VSM ……(2)
Specifically, when stable operating voltage VSF was 40V～50V, the starting resistor VM1 that will work was set at for example 240V, work is stopped voltage VM2 be set at for example 100V.
The steady operation control circuit 9 of total switch circuit 8 has voltage decision circuitry 91 and drive circuit 92.At first, voltage decision circuitry 91 is after connecting AC-input voltage V1 to AC input terminal 1, in the uphill process that the rectification smooth voltage Vb of rectification smoothed filter circuit 7 rises, detect this rectification smooth voltage Vb and reach work starting resistor VM1 (for example 240V), perhaps after cutting off AC-input voltage V1, in the decline process that rectification smooth voltage Vb descends, detect rectification smooth voltage Vb and reach work and stop voltage VM2 (for example 100V).This voltage decision circuitry 91 comprises resistance 911, resistance 912, control switch element 913 and Zener diode 914.
Resistance 911 and resistance 912 are connected on mutually between the negative electrode C and ground of rectifier diode 71 of rectification smoothed filter circuit 7.One end of resistance 911 directly connects the negative electrode C of rectifier diode 71, the direct ground connection of an end of resistance 912.This resistance 911 and 912 bleeder circuits that constitute rectification smooth voltage Vb dividing potential drop produce the branch pressure voltage VS2 to rectification smooth voltage Vb.
Constitute control switch element 913 with for example P channel mosfet, its grid G directly connects the tie point of resistance 911 and resistance 912, and this grid G is supplied with branch pressure voltage VS2.With the direct ground connection of the source S of control switch element 913.With the direct ground connection of the anode A of Zener diode 914, its negative electrode C connects the grid G of control switch element 913.This Zener diode raises at the grid voltage of control switch element 913 and punctures when too much, with protection control switch element 913.
The characteristic that control switch element 913 has is: be in blocking state usually, when the branch pressure voltage VS2 that is added to its grid is elevated to gate-on voltage Von2, switch to conducting state from blocking state, when branch pressure voltage VS2 is reduced to grid blocking voltage Voff2, return to blocking state then from conducting state.Gate-on voltage Von2 is higher than grid blocking voltage Voff2.Gate-on voltage Von2 sets work starting resistor VM1, and grid blocking voltage Voff2 setting work stops voltage VM2.
Drive circuit 92 comprises driving switch element 921, resistance 922, Zener diode 923, Zener diode 924 and resistance 925.Constitute driving switch element 921 with for example P channel mosfet.The drain D of this driving switch element 921 is passed through driving voltage () the terminal VCC that Zener diode 924 connects switch control IC 841, the direct ground connection of its source S, and its grid G connects the drain D of control switch element 913.Resistance 922 is connected between the negative electrode C of the grid G of driving switch element 921 and rectifier diode 71, resistance 925 is connected between the drain D and ground of driving switch element 921.
Zener diode 924 is configured by the polarity that its anode A connects the drain D of driving switch element 921.This Zener diode 924 has Zener voltage VZ3, and this Zener voltage VZ3 compares with the Zener voltage VZ2 of Zener diode 843, and is enough little.The polarity of Zener diode 923 by anode A ground connection is connected between the grid G and ground of driving switch element 921.Zener diode 923 punctures when applying excessive grid voltage on the grid G of driving switch element 921, with protection driving switch element 921.
The control switch element 913 of voltage decision circuitry 91 is in blocking state usually.Therefore, after connecting AC-input voltage V1, in the uphill process that AC-input voltage V1 rises, when the rectification smooth voltage Vb of the lead-out terminal 7a of rectification smoothed filter circuit 7 slightly raises, on the grid of driving switch element 921, produce the voltage that makes driving switch element 921 conductings by resistance 922, thereby driving switch element 921 becomes conducting state.Under the conducting state of this driving switch element (921), because Zener diode 924 punctures, its Zener voltage VZ3 will be suppressed to low level to the driving power voltage VMD of the driving power terminal VCC of switch control IC 5841.This state is controlled to non operating state with switch control IC 841.The non operating state of this switch control IC 841 makes its output OUT keep low level, and switch element 831 is kept blocking state.
In the uphill process of rectification smooth voltage Vb, when this rectification smooth voltage Vb reaches work starting resistor VM1 (for example 240V), become the gate-on voltage Von2 that is equal to or greater than control switch element 913 by the branch pressure voltage VS2 that obtains after resistance 911 and resistance 912 dividing potential drops, make this control switch element 913 switch to conducting state from blocking state.Thereupon, the grid voltage of driving switch element 921 is reduced to roughly 0 current potential, thereby driving switch element 921 switches to blocking state from conducting state.The result, the driving power voltage VMD of the driving power terminal VCC of switch control IC 841 is not suppressed by the Zener voltage VZ3 of Zener diode 924, and become the voltage that is equal to or greater than its Zener voltage VZ2 because of Zener diode 843 punctures, thereby switch control IC 841 is started working.
The starting resistor VM1 (for example 240V) that will work sets the stable operating voltage VSM that is equal to or greater than total switch circuit 8 (40V～50V) for example for, when so switch control IC 841 starts work with work starting resistor VM1, total switch circuit 8 sharply switches to operating state from non operating state, thereby begin to carry out steady operation, instability action does not in the past take place.
In the decline process of rectified pulsatory voltage, during the rectification smooth voltage Vb work of being reduced to stopping voltage VM2 (for example 100V), branch pressure voltage VS2 is reduced to the grid blocking voltage Voff2 of control switch element 913, thereby this control switch element 913 switches to blocking state from conducting state, recovers blocking state.Therefore, driving switch element 921 recovers conducting states, will be suppressed to the low Zener voltage VZ3 of Zener diode 924 to the driving power voltage VMD of the driving power terminal VCC of switch control IC 841, thereby total switch circuit 8 is quit work.
Because being stopped voltage VM2 (for example 100V), work sets the stable operating voltage VSM that is equal to or greater than total switch circuit 8 (40V～50V) for example for, when stopping voltage VM2 switch control IC 841 quit work with work, total switch circuit 8 sharply quits work from steady operation, and the result stops work and in the past instability action does not take place.
Work is stopped voltage VM2 set, and lagging characteristics is set between them less than work starting resistor VM1.Therefore, setting work stops voltage VM2, although make total switch circuit 8 start work with work starting resistor VM1, electric current is in these circuit 8 circulations, and rectified pulsatory voltage Vb reduces, do not cause rectified pulsatory voltage Vb to be reduced to the work of being not more than yet and stop voltage VM2, thereby can eliminate total switch circuit 8 job insecurities reliably.
The existing circuit of not establishing steady operation control circuit 9 is in the uphill process of rectified pulsatory voltage Vb, this voltage Vb reaches for example stage of 30V reach the stable operating voltage VSM of total switch circuit 8 from rectified pulsatory voltage Vb before, along with the rising of driving power voltage VMD, the 841 startup work of switch control IC.These switch control IC 841 startup work, make 811 conductings of master switch element after, the electric current that flows through master switch element 811 strengthens, and causes rectified pulsatory voltage Vb to reduce, and switch control IC 841 out-of-work once more unstable action U3 (Fig. 6 (d)) take place.
The existing circuit of not establishing steady operation control circuit 9 is in the decline process of rectified pulsatory voltage Vb, the stable operating voltage VSM and this voltage Vb that are lower than total switch circuit 8 from rectified pulsatory voltage Vb are reduced to for example stage of 25V, along with the reduction of driving power voltage VMD, switch control IC 841 quits work.Quitting work when the electric current that flows through master switch element 811 is reduced of this switch control IC 841, thereby rectified pulsatory voltage Vb raises generation switch control IC 841 out-of-work once more unstable action U4 (Fig. 6 (d)) once more.
Steady operation control circuit 9 of the present invention is with the work of the work starting resistor VM1 starting switch control control IC 841 of the stable operating voltage VSM that is not less than total open circuit 8, and stop voltage VM2 with the work that is not less than this stable operating voltage VSM switch control IC 841 is quit work, thereby can eliminate the such instability action of circuit in the past.Can eliminate power factor improvement circuit 5 causes unstable action along with total switch circuit 8 job insecurities defective again.
From Fig. 4 (c), (d) as can be known, in the uphill process of rectified pulsatory voltage Vb, when this rectified pulsatory voltage Vb surpasses the stable operating voltage VSM of total switch circuit 8 and reaches work starting resistor VM1, driving power voltage VMD to switch control IC (841) sharply strengthens, thereby total switch circuit 8 carries out steady operation, and unstable action does not take place; In the rectified pulsatory voltage Vb decline process, when the work that this voltage Vb reaches the stable operating voltage VSM that is not less than total switch circuit 8 stops voltage VM2, driving power voltage VMD to switch control IC 841 sharply reduces, thereby work is stopped, and unstable action does not take place total switch circuit 8.
In the execution mode 1, to steady operation control circuit 6 control of power factor improvement circuit 5 control voltage VF to the sub-COMP in work control input end of power factor (PF) control IC 521, but also can be by utilizing the driving power voltage VFD of steady operation control circuit 6 controls to power factor (PF) control IC 521, work starting resistor VF1 and the work set power factor improvement circuit 5 stop voltage VF2.At this moment, it is identical with for example steady operation control circuit 9 steady operation control circuit 6 to be made structure.
In the execution mode 1, power factor improvement circuit 5 usefulness power controlling factors IC521 control booster circuit 51, but also power factor (PF) control IC 521 can be replaced microcomputer, and the program high-frequency drive boosted switch element 513 with this microcomputer makes its break-make.At this moment, steady operation control circuit 6 is by the driving power voltage of control microcomputer or the signal in the microcomputer, and work starting resistor VF1 and the work set power factor improvement circuit 5 stop voltage VF2.
In the execution mode 1, total switch circuit 8 usefulness switch control IC 841 control inverter circuit 81, but also switch control IC 841 can be replaced microcomputer, the driven by program master switch element 811 with this microcomputer makes its break-make.At this moment, steady operation control circuit 9 is by the driving power voltage of control microcomputer or the signal in the microcomputer, and work starting resistor VM1 and the work set total switch circuit 8 stop voltage VM2.
Industrial practicality
The switch that switching power unit of the present invention can be used for general switching power unit and carry out tension force control Supply unit.
Claims (10)
1, a kind of switching power unit, comprise: AC-input voltage is carried out rectification and produced the rectification circuit of rectified pulsatory voltage, the described rectified pulsatory voltage of peak time tracking that produces high-frequency current and make this high-frequency current according to described rectified pulsatory voltage is to carry out the power factor improvement circuit of power factor improvement, output voltage to described power factor improvement circuit carries out rectification and makes it smoothly to produce the rectifier smoothing circuit of rectification smooth voltage, and described rectification smooth voltage switched to produce the total switch circuit of ac output voltage, it is characterized in that
Also has steady operation control circuit to described power factor improvement circuit;
This is to the steady operation control circuit of power factor improvement circuit, in the uphill process of described AC-input voltage, described rectified pulsatory voltage reaches when setting the driving starting resistor (VF1) that is not less than the stable operating voltage (VSF) that makes the abundant steady operation of described power factor improvement circuit for, and described power factor improvement circuit is started working.
2, switching power unit as claimed in claim 1 is characterized in that,
Described steady operation control circuit in described AC-input voltage decline process, when described rectified pulsatory voltage reaches and sets the driving that is not less than described stable operating voltage (VSF) for and stop voltage (VF2), quits work described power factor improvement circuit.
3, switching power unit as claimed in claim 2 is characterized in that,
In described steady operation control circuit, set the value of described driving starting resistor (VF1) for stop voltage (VF2) greater than described driving value to the power factor improvement circuit.
4, switching power unit as claimed in claim 1 is characterized in that,
Described steady operation control circuit to the power factor improvement circuit, has the voltage decision circuitry of judging described rectified pulsatory voltage, this voltage decision circuitry is included in the control switch element that moves when rectified pulsatory voltage reaches described driving starting resistor (VF1) described in the uphill process of described AC-input voltage, and, described power factor improvement circuit is started working according to the action of this switch element.
5, switching power unit as claimed in claim 4 is characterized in that,
Described voltage decision circuitry when described rectified pulsatory voltage reaches described driving and stops voltage (VF2), utilizes described control switch element that described power factor improvement circuit is quit work in the decline process of described AC-input voltage.
6, switching power unit as claimed in claim 1 is characterized in that,
Also has steady operation control circuit to described total switch circuit;
This is to the steady operation control circuit of total switch circuit, in the uphill process of described AC-input voltage, described rectification smooth voltage reaches when setting the driving starting resistor (VM1) that is not less than the stable operating voltage (VSM) that makes the abundant steady operation of described total switch circuit for, and described total switch circuit is started working.
7, switching power unit as claimed in claim 6 is characterized in that,
Described steady operation control circuit to total switch circuit, in the decline process of described AC-input voltage, when described rectification smooth voltage reaches and sets the driving that is not less than described stable operating voltage (VSM) for and stop voltage (VM2), described total switch circuit is quit work.
8, switching power unit as claimed in claim 7 is characterized in that,
In described steady operation control circuit, the value of described driving starting resistor (VM1) set for greater than described driving stop voltage (VM2) total switch circuit.
9, switching power unit as claimed in claim 6 is characterized in that,
Described steady operation control circuit to total switch circuit, has the voltage decision circuitry of judging described rectification smooth voltage, this voltage decision circuitry is included in the control switch element of action when the rectification smooth voltage reaches described driving starting resistor (VM1) described in the uphill process of described AC-input voltage, and, described total switch circuit is started working according to this action to this switch element in the voltage decision circuitry of the steady operation control circuit of total switch circuit.
10, switching power unit as claimed in claim 9 is characterized in that,
The voltage decision circuitry of described steady operation control circuit to total switch circuit, in the decline process of described AC-input voltage, when described rectified pulsatory voltage reaches described driving and stops voltage (VM2), utilize the described control switch element in the voltage decision circuitry of described steady operation control circuit to total switch circuit, make described total switch circuit stop action.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005154200 | 2005-05-26 | ||
| JP2005154200A JP4057024B2 (en) | 2005-05-26 | 2005-05-26 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1870410A true CN1870410A (en) | 2006-11-29 |
| CN100546159C CN100546159C (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101192118A Expired - Fee Related CN100546159C (en) | 2005-05-26 | 2005-10-26 | Switching power unit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4057024B2 (en) |
| CN (1) | CN100546159C (en) |
| TW (1) | TWI278173B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008263666A (en) * | 2007-04-10 | 2008-10-30 | Kyocera Mita Corp | Power supply unit and image forming apparatus equipped with the same |
| JP2012152066A (en) | 2011-01-20 | 2012-08-09 | Olympus Corp | Power supply device |
| JP6239242B2 (en) * | 2013-02-07 | 2017-11-29 | 新電元工業株式会社 | Semiconductor illumination power supply control circuit, semiconductor integrated circuit, and semiconductor illumination power supply |
| KR102343260B1 (en) * | 2015-01-12 | 2021-12-23 | 엘지전자 주식회사 | Power converter and air conditioner including the same |
| JP6499118B2 (en) * | 2016-04-25 | 2019-04-10 | 京楽産業．株式会社 | Game machine |
| TWI678871B (en) * | 2018-08-07 | 2019-12-01 | 台達電子工業股份有限公司 | Power converter |
-
2005
- 2005-05-26 JP JP2005154200A patent/JP4057024B2/en not_active Expired - Fee Related
- 2005-07-21 TW TW094124640A patent/TWI278173B/en not_active IP Right Cessation
- 2005-10-26 CN CNB2005101192118A patent/CN100546159C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
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| TWI278173B (en) | 2007-04-01 |
| CN100546159C (en) | 2009-09-30 |
| JP4057024B2 (en) | 2008-03-05 |
| JP2006333634A (en) | 2006-12-07 |
| TW200642252A (en) | 2006-12-01 |
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