CN104917411A - AC-DC control chip of single-stage high power factor correction (PFC) and switching power supply circuit - Google Patents
AC-DC control chip of single-stage high power factor correction (PFC) and switching power supply circuit Download PDFInfo
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- CN104917411A CN104917411A CN201510360404.6A CN201510360404A CN104917411A CN 104917411 A CN104917411 A CN 104917411A CN 201510360404 A CN201510360404 A CN 201510360404A CN 104917411 A CN104917411 A CN 104917411A
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Abstract
The invention discloses an AC-DE control chip of a single-stage high power factor correction (PFC) and a switching power supply circuit. The AC-DE control chip of the single-stage high PFC comprises a degaussing time detection module, a current sampling and holding module, a constant-voltage control module, a constant-current control module and a logic drive module. In the AC-DC control chip of the single-stage high PFC, with the arrangement of the constant-voltage control module and the constant-current control module, the AC-DC control chip can work in a constant-current mode, also can work in a constant-voltage mode, and can be used for providing constant voltage and constant current for a load, the load is effectively protected, and the power supply quality of a switching power supply is improved.
Description
Technical field
The present invention relates to switch power technology field, particularly the AC-DC control chip of a kind of single-stage height PFC and switching power circuit.
Background technology
Along with the development gradually of switch power technology, with in order to alleviate electrical network pressure and reduce costs, the AC-DC switch power controller chip of single-stage height PFC obtains good development, but the chip of single-stage height PFC function only has constant current function and does not have pressure-keeping functions on the market at present, technical difficulty is when line voltage is in steamed bun wave envelope lower, both sides time, because inductance time of afterflow is very short and cannot normally sample to output loading voltage, also the Isobarically Control of loop cannot just be realized, the AC-DC control chip of visible existing single-stage height PFC still needs to further develop and improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide AC-DC control chip and the switching power circuit of a kind of single-stage height PFC, the AC-DC control chip achieving single-stage height PFC function had both had constant current function and had also had pressure-keeping functions.
In order to achieve the above object, this invention takes following technical scheme:
An AC-DC control chip of single-stage height PFC, comprising:
Erasing time detecting module, for detecting time erasing time of limit inductive current, and exports to constant-current control module;
Current sample keeps module, for the crest voltage that the described AC-DC control chip CS that samples holds, and exports to Isobarically Control module and constant-current control module;
Isobarically Control module, for the crest voltage that the signal held according to AC-DC control chip FB and current sample keep module to export, carries out Isobarically Control by logical AND driver module;
Constant-current control module, for the signal that the erasing time signal, the crest voltage of current sample maintenance module output, the signal of described AC-DC control chip COMP end and the described AC-DC control chip GATE that export according to erasing time detecting module hold, carry out Isobarically Control by logical AND driver module;
Logical AND driver module, for loaded work piece at constant current mode time, according to the signal that constant-current control module exports, to control and the GATE of AC-DC control chip holds the break-make of the switching tube be connected; Loaded work piece at constant voltage mode time, according to the signal that Isobarically Control module exports, to control and the GATE of AC-DC control chip holds the break-make of the switching tube be connected.
In the AC-DC control chip of described single-stage height PFC, described Isobarically Control module comprises:
First switch;
Second switch;
Elementary constant voltage unit, the difference for the signal held by AC-DC control chip FB and the first reference voltage is amplified, and the difference after amplifying is compared with built-in ramp signal, and output Isobarically Control signal is to logical AND driver module;
Secondary constant voltage unit, the turn-off time of the switching tube that the signal for AC-DC control chip FB end of sampling is corresponding, when described crest voltage is lower than the second reference voltage, reduces the turn-off time of described switching tube at next cycle; When described crest voltage is lower than the 3rd reference voltage, latches the now corresponding turn-off time, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube;
Voltage comparison unit, for the size of more described crest voltage and the second reference voltage, the 3rd reference voltage, and exports to described secondary constant voltage unit by comparative result; At described crest voltage, lower than controlling during the second reference voltage, the first switch disconnects, second switch closes, and at described crest voltage, higher than controlling during the second reference voltage, the first switch is closed, second switch disconnects;
The input of described elementary constant voltage unit be described Isobarically Control module first input end, connect the FB end of described AC-DC control chip; The output of described elementary constant voltage unit is connected one end of second switch by secondary constant voltage unit, is also connected the other end of second switch by the first switch; The other end of described second switch is output, the connection logical AND driver module of described Isobarically Control module; The input of described voltage comparison unit is the second input, the connection current sample maintenance module of described Isobarically Control module, first output of described voltage comparison unit connects the control end of secondary constant voltage unit and second switch, second output of described voltage comparison unit connects secondary constant voltage unit, and the 3rd output of described voltage comparison unit connects the control end of the first switch.
In the AC-DC control chip of described single-stage height PFC, described secondary constant voltage unit also comprises:
Turn-off time gathers subelement, for the turn-off time of the switching tube of the FB end correspondence of AC-DC control chip of sampling;
Turn-off time controls subelement, for when described crest voltage is lower than the second reference voltage, obtain the turn-off time that turn-off time collection subelement is sampled for the last time, is multiplied by a coefficient this turn-off time, is set to the turn-off time of next cycle switching tube the turn-off time of being multiplied by coefficient; When described crest voltage is lower than the 3rd reference voltage, latches the turn-off time that the now turn-off time gathers subelement sampling, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube;
Wherein, described coefficient is less than 1 and in direct ratio with described crest voltage.
In the AC-DC control chip of described single-stage height PFC, described elementary constant voltage unit comprises controlling of sampling switch, the first electric capacity, error amplifier, the first comparator and the slope subelement for generation of ramp signal; One end of described controlling of sampling switch is the input of elementary constant voltage unit, the FB end of connection AC-DC control chip, and the other end of described controlling of sampling switch connects the inverting input of error amplifier, also by the first capacity earth; The normal phase input end of described error amplifier connects the first reference voltage providing end, the output of described error amplifier connects the normal phase input end of the first comparator, described slope subelement connects the inverting input of the first comparator, and the output of described first comparator is the output of described elementary constant voltage unit, connects secondary constant voltage unit and the first switch.
In the AC-DC control chip of described single-stage height PFC, described voltage comparison unit comprises the second comparator, 3rd comparator and inverter, the inverting input of described second comparator is the input of described voltage comparison unit, connect current sample and keep the output of module and the inverting input of the 3rd comparator, the normal phase input end of described second comparator connects the second reference voltage providing end, the normal phase input end of described 3rd comparator connects the 3rd reference voltage providing end, the output of described second comparator is the first output of voltage comparison unit, connect the control end of second switch, the input of secondary constant voltage unit and inverter, the output of described 3rd comparator is the second output of voltage comparison unit, connect secondary constant voltage unit, the output of described inverter is the 3rd output of voltage comparison unit, connect the control end of the first switch.
In the AC-DC control chip of described single-stage height PFC, described AC-DC control chip also comprises built-in power module, for providing working power for described AC-DC control chip; Described built-in power module connects the VCC end of described AC-DC control chip.
In the AC-DC control chip of described single-stage height PFC, described AC-DC control chip also comprises protection module, for providing overheat protector, output over-voltage protection and load short circuits to protect for described AC-DC control chip; Described protection module connects described logical AND driver module.
In the AC-DC control chip of described single-stage height PFC, described first switch and second switch are the digital switch that high level closes, low level disconnects.
A kind of switching power circuit, comprises the AC-DC control chip of single-stage height PFC as above.
Compared to prior art; the AC-DC control chip of single-stage height PFC provided by the invention and switching power circuit; by arranging Isobarically Control module and constant-current control module; described AC-DC control chip is made to be operated in constant current mode; also constant voltage mode can be operated in; can be load and constant voltage and constant current are provided, effectively protect load, improve the power supply quality of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of switching power circuit provided by the invention.
Fig. 2 is the structured flowchart of the AC-DC control chip of single-stage height PFC provided by the invention.
Fig. 3 is in the AC-DC control chip of single-stage height PFC provided by the invention, the structured flowchart of Isobarically Control module.
Fig. 4 is in the AC-DC control chip of single-stage height PFC provided by the invention, the circuit diagram of elementary constant voltage unit.
Fig. 5 is in the AC-DC control chip of single-stage height PFC provided by the invention, the circuit diagram of voltage comparison unit.
Fig. 6 is that in the AC-DC control chip of single-stage height PFC provided by the invention, crest voltage CSs, line voltage envelope and Isobarically Control module 40 output signal the oscillogram of CV.
Embodiment
The invention provides AC-DC control chip and the switching power circuit of a kind of single-stage height PFC.For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, Fig. 1 is switching power circuit provided by the invention, comprises AC-DC control chip U1 and the switching tube Q1 of single-stage height PFC provided by the invention.Described AC-DC control chip U1, by the break-make of control switch pipe Q1, makes output voltage Vout and the constant output current of switching power circuit.
See also Fig. 2, the AC-DC control chip U1 of single-stage height PFC provided by the invention comprises erasing time detecting module 10, current sample keeps module 20, constant-current control module 30, Isobarically Control module 40, protection module 50, logical AND driver module 60 and built-in power module 70.
Described erasing time detecting module 10, for detecting time erasing time of limit inductive current, and exports to constant-current control module 30.
Described current sample keeps module 20, for the crest voltage that the described AC-DC control chip CS that samples holds, and exports to Isobarically Control module 40 and constant-current control module 30.
Described Isobarically Control module 40, for the crest voltage that the signal held according to AC-DC control chip FB and current sample keep module 20 to export, carries out Isobarically Control by logical AND driver module 60.That is, described Isobarically Control module 40 is controlled by the break-make of logical AND driver module 60 to described switching tube Q1, makes the output voltage Vout of switching power circuit constant.
Described constant-current control module 30, for the signal that the erasing time signal, the crest voltage of current sample maintenance module 20 output, the signal of described AC-DC control chip COMP end and the described AC-DC control chip GATE that export according to erasing time detecting module 10 hold, carry out Isobarically Control by logical AND driver module 60.Because current single-stage height PFC constant current technology is very ripe, therefore repeat no more the concrete circuit structure of described constant-current control module 30 and operation principle thereof.
Described protection module 50, for providing overheat protector, output over-voltage protection and load short circuits to protect for described AC-DC control chip U1; Described protection module 50 connects described logical AND driver module 60.
Described built-in power module 70; for providing working power for described AC-DC control chip U1; concrete, for described erasing time detecting module 10, current sample keep module 20, constant-current control module 30, Isobarically Control module 40, protection module 50 and logical AND driver module 60 to provide power supply.Described built-in power module 70 connects the VCC end of described AC-DC control chip U1.
Described logical AND driver module 60, for loaded work piece at constant current mode time, according to the signal CC that constant-current control module 30 exports, to control and the GATE of AC-DC control chip U1 holds the break-make of the switching tube Q1 be connected; Loaded work piece at constant voltage mode time, according to the signal CV that Isobarically Control module 40 exports, to control and the GATE of AC-DC control chip U1 holds the break-make of the switching tube Q1 be connected.Described logical AND driver module 60, also under the control of described protection module 50, makes switching tube Q1 turn off, protection switch power circuit.
It can thus be appreciated that AC-DC control chip U1 provided by the invention not only can make switching power circuit output constant current, it can also be made to export constant voltage, effectively protect load, improve the power supply quality of Switching Power Supply.
The FB end of described AC-DC control chip U1 connects the input of erasing time detecting module 10 and the first input end 1 of Isobarically Control module 40, the output of described erasing time detecting module 10 connects the first input end 1 ' of constant-current control module 30, the CS end of described AC-DC control chip U1 keeps module 20 to connect the second input 2 of Isobarically Control module 40 and the second input 2 ' of constant-current control module 30 by current sample, 3rd input 3 ' of described constant-current control module 30 connects the COMP end of AC-DC control chip U1, the four-input terminal 4 ' of described constant-current control module 30 connects the GATE end of AC-DC control chip U1, the output of described Isobarically Control module 40 and the output of constant-current control module 30 are connected the GATE end of AC-DC control chip U1 by logical AND driver module 60.
Further, refer to Fig. 3, described Isobarically Control module 40 comprises the first switch S 1, second switch S2, elementary constant voltage unit 410, secondary constant voltage unit 420 and voltage comparison unit 430.Wherein, described first switch S 1 and second switch S2 are the digital switch that high level closes, low level disconnects.
Described elementary constant voltage unit 410, the difference for the signal held by AC-DC control chip FB and the first reference voltage ref1 is amplified, and the difference after amplifying is compared with built-in ramp signal, and output Isobarically Control signal is to logical AND driver module 60.
Described secondary constant voltage unit 420, the turn-off time of the switching tube Q1 that the signal for AC-DC control chip FB end of sampling is corresponding, when described crest voltage CSs is lower than the second reference voltage ref2, reduces the turn-off time of described switching tube Q1 at next cycle; When described crest voltage CSs is lower than the 3rd reference voltage ref3, latches the now corresponding turn-off time, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube Q1.Described second reference voltage ref2 is used for judging that line voltage is in the position of steamed bun wave envelope, and when described crest voltage CSs is higher than the second reference voltage ref2, described line voltage is in steamed bun wave envelope higher position.
Described voltage comparison unit 430, for the size of more described crest voltage CSs and the second reference voltage ref2, the 3rd reference voltage ref3, and exports to described secondary constant voltage unit 420 by comparative result; At described crest voltage CSs, lower than controlling during the second reference voltage ref2, the first switch S 1 disconnects, second switch S2 closes, and at described crest voltage CSs, higher than controlling during the second reference voltage ref2, the first switch S 1 is closed, second switch S2 disconnects.
The input of described elementary constant voltage unit 410 be described Isobarically Control module 40 first input end 1, connect the FB end of described AC-DC control chip U1; The output of described elementary constant voltage unit 410 is connected one end of second switch S2 by secondary constant voltage unit 420, is also connected the other end of second switch S2 by the first switch S 1; The other end of described second switch S2 is output, the connection logical AND driver module 60 of described Isobarically Control module 40; The input of described voltage comparison unit 430 is the second input 2, the connection current sample maintenance module 20 of described Isobarically Control module 40, first output 1 ' of described voltage comparison unit 430 ' connect the control end of secondary constant voltage unit 420 and second switch S2, second output 2 ' of described voltage comparison unit 430 ' connect secondary constant voltage unit 420, the 3rd output 3 ' of described voltage comparison unit 430 ' connects the control end of the first switch S 1.
When described elementary constant voltage unit 410 carries out Isobarically Control, there is a defect: when line voltage is in the lower of steamed bun wave envelope both sides, described crest voltage CSs is very low, secondary limit winding inductance time of afterflow is very short, therefore cannot normally sample to output loading feedback signal (i.e. the signal of the FB end input of AC-DC control chip), also just mean that described elementary constant voltage unit 410 normally cannot export control signal, system constant voltage loop can be out of control.
And described Isobarically Control module 40 well solves the problems referred to above.The voltage (crest voltage CSs) that the CS that the present invention keeps module 20 to sample AC-DC control chip by current sample holds, and described crest voltage CSs and inner second reference voltage ref2(is preferably 0.5V) compare, if crest voltage CSs is higher than the second reference voltage ref2, now line voltage is in steamed bun wave envelope higher position, first switch S 1 described in Fig. 3 is closed, second switch S2 disconnects, described logical AND driver module 60 is controlled by the output signal ncv of elementary constant voltage unit 410, and system loop can normal table work.And described crest voltage CSs is lower than the second reference voltage ref2, now line voltage is in the lower of steamed bun wave envelope both sides, described first switch S 1 disconnects, and second switch S2 closes, and now logical AND driver module 60 is controlled by the output signal rcv of secondary constant voltage unit 420.
It can thus be appreciated that, described Isobarically Control module 40, according to the voltage that the CS of AC-DC control chip holds, control logic and driver module 60 is replaced by elementary constant voltage unit 410 and secondary constant voltage unit 420, achieve Isobarically Control, and well solve the problem that when traditional Isobarically Control on-Line Voltage is in steamed bun wave envelope lower, constant voltage loop is out of control.
Further, described secondary constant voltage unit 420 also comprises turn-off time collection subelement and turn-off time control subelement.
The described turn-off time gathers subelement, for the turn-off time of the switching tube Q1 of the FB end correspondence of the AC-DC control chip U1 that samples.
The described turn-off time controls subelement, for when described crest voltage CSs is lower than the second reference voltage ref2, obtain the turn-off time that turn-off time collection subelement is sampled for the last time, is multiplied by a COEFFICIENT K this turn-off time, is set to the turn-off time of next cycle switching tube Q1 the turn-off time of being multiplied by COEFFICIENT K; When described crest voltage CSs is lower than the 3rd reference voltage ref3, latches the turn-off time that the now turn-off time gathers subelement sampling, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube Q1.Wherein, described COEFFICIENT K is less than 1 and in direct ratio with described crest voltage CSs.
Concrete, along with the reduction gradually of line voltage, described crest voltage CSs also can reduce gradually, when it is 0.5V lower than the second reference voltage ref2(value) time, the present invention no longer samples to FB signal, but the turn-off time Toff1 of switching tube Q1 corresponding when being sampled by described secondary constant voltage unit 420 and latch last sampling FB end signal, and set the turn-off time Toffx of next cycle switch pipe Q1 according to the size of this cycle peak voltage CSs.It can be reduced to formula: Toffx=Toff1*K, and wherein K value is less than 1 and in direct ratio with crest voltage CSs, that is, more low k is less for crest voltage CSs, and namely the turn-off time Toffx of switching tube Q1 is also shorter; When crest voltage CSs drops to lower than (value is 0.25V) during the 3rd reference voltage ref3, described secondary constant voltage unit 420 latches the turn-off time Toff2 of now corresponding switching tube Q1, and is set to the Toff2 that fixes in the ensuing cycle turn-off time of switching tube Q1, until crest voltage CSs next time is higher than the 3rd reference voltage ref3.
Refer to Fig. 4, described elementary constant voltage unit 410 comprises controlling of sampling switch S 3, first electric capacity C1, error amplifier U2, the first comparator U3 and the slope subelement 411 for generation of ramp signal; One end of described controlling of sampling switch S 3 is the input of elementary constant voltage unit 410, the FB end of connection AC-DC control chip U1, and the other end of described controlling of sampling switch S 3 connects the inverting input of error amplifier U2, also by the first electric capacity C1 ground connection; The normal phase input end of described error amplifier U2 connects the first reference voltage ref1 providing end, the output of described error amplifier U2 connects the normal phase input end of the first comparator U3, described slope subelement 411 connects the inverting input of the first comparator U3, and the output of described first comparator U3 is the output of described elementary constant voltage unit 410, connects secondary constant voltage unit 420 and the first switch S 1.
The feedback signal of the FB end input of described AC-DC control chip, kept by the first electric capacity C1 after described controlling of sampling switch S 3 is sampled, after keep the difference of voltage and inner first reference voltage ref1 to amplify through described error amplifier U2 this, compared with the ramp signal that signal after amplification and described slope subelement 411 produce, export constant voltage signal ncv, realize Isobarically Control when line voltage is in steamed bun wave envelope higher position.
Refer to Fig. 5, described voltage comparison unit 430 comprises the second comparator U4, 3rd comparator U5 and inverter U6, the inverting input of described second comparator U4 is the input of described voltage comparison unit 430, connect current sample and keep the output of module 20 and the inverting input of the 3rd comparator U5, the normal phase input end of described second comparator U4 connects the second reference voltage ref2 providing end, the normal phase input end of described 3rd comparator U5 connects the 3rd reference voltage ref3 providing end, the output of described second comparator U4 is the first output 1 ' of voltage comparison unit 430 ', connect the control end of second switch S2, the input of secondary constant voltage unit 420 and inverter U6, the output of described 3rd comparator U5 is the second output 2 ' of voltage comparison unit 430 ', connect secondary constant voltage unit 420, the output of described inverter U6 is the 3rd output 3 ' of voltage comparison unit 430 ', connect the control end of the first switch S 1.
The line voltage envelope f1 that Fig. 6 comprises the oscillogram of the crest voltage CSs that described AC-DC control chip CS holds, described oscillogram is formed and Isobarically Control module 40 output signal the oscillogram of CV.As can be seen from Figure 6, when crest voltage CSs is lower than 0.5V, 3rd output 3 ' of voltage comparison unit 430 described in Fig. 3 ' output signal transfer low level, the first output 1 ' to by high level ' output signal transfers high level to by low level, now described in Fig. 3, the first switch S 1 is opened, described second switch S2 closes, and now system constant voltage signal CV controls by signal rcv; When crest voltage CSs is lower than 0.25V, first output 1 ' of described voltage comparison unit 430 ' signal that exports is still high level, system constant voltage signal CV still controls by signal rcv, remains that Toff2 is constant until next crest voltage CSs is higher than 0.25V the switching tube Q1 turn-off time.When crest voltage CSs by low uprise be greater than 0.5V after, described in Fig. 3, the first switch S 1 closes, described second switch S2 opens, the output signal rcv of described secondary constant voltage unit 420 is disconnected, system constant voltage signal CV again this output signal ncv by described elementary constant voltage unit 410 controls, and utilizes the present invention can realize high PFC pressure-keeping functions in whole line voltage envelope (shown in Fig. 6 dashed curve f1) as seen from the above analysis.
Refer to Fig. 1, based on the AC-DC control chip of the single-stage height PFC that a upper embodiment provides, the present invention also provides a kind of switching power circuit, comprise the AC-DC control chip U1 of single-stage height PFC as above, certainly, rectifier bridge 810, second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, switching tube Q1, the first diode D1, the second diode D2, snubber module 820, transformer 830 and induction coil L is also comprised.Wherein, described snubber module 820 is for absorbing the self-induced e.m.f of transformer 830 former limit winding Np.
External communication electricity (85V-265V) connects one end of the first resistance R1 by described rectifier bridge 810, by the second electric capacity C2 ground connection, also by one end of the former limit winding Np of snubber module 820 connection transformer 830, described first resistance R1 connects the VCC end of described AC-DC control chip U1, also by the 3rd electric capacity C3 ground connection, the GND of described AC-DC control chip U1 holds ground connection, the COMP end of described AC-DC control chip U1 is by the 4th electric capacity C4 ground connection, the GATE end of described AC-DC control chip U1 connects the grid of described switching tube Q1, the source electrode of described switching tube Q1 connects the CS end of AC-DC control chip U1, also by the second resistance R2 ground connection, the other end of drain electrode connection transformer 830 former limit winding Np of described switching tube Q1 and the input of snubber module 820, the former limit winding Np of described induction coil L sensor transformer 830, one end ground connection of described induction coil L, the other end of described induction coil L connects the positive pole of the first diode D1 and one end of the 3rd resistance R3, the negative pole of described first diode D1 connects the VCC end of AC-DC control chip U1 and the other end of the first resistance R1, the other end of described 3rd resistance R3 connects the FB end of AC-DC control chip U1, also by the 4th resistance R4 ground connection, one end of the secondary limit winding Ns of described transformer 830 connects the positive pole of the second diode D2, the other end ground connection of described limit winding Ns, the negative pole of described second diode D2 is the output of described switching power circuit, connect load, also by the 5th electric capacity C5 ground connection.
Because the operation principle of described switching power circuit and feature elaborate in a upper embodiment, do not repeat them here.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (9)
1. an AC-DC control chip of single-stage height PFC, is characterized in that, comprising:
Erasing time detecting module, for detecting time erasing time of limit inductive current, and exports to constant-current control module;
Current sample keeps module, for the crest voltage that the described AC-DC control chip CS that samples holds, and exports to Isobarically Control module and constant-current control module;
Isobarically Control module, for the crest voltage that the signal held according to AC-DC control chip FB and current sample keep module to export, carries out Isobarically Control by logical AND driver module;
Constant-current control module, for the signal that the erasing time signal, the crest voltage of current sample maintenance module output, the signal of described AC-DC control chip COMP end and the described AC-DC control chip GATE that export according to erasing time detecting module hold, carry out Isobarically Control by logical AND driver module;
Logical AND driver module, for loaded work piece at constant current mode time, according to the signal that constant-current control module exports, to control and the GATE of AC-DC control chip holds the break-make of the switching tube be connected; Loaded work piece at constant voltage mode time, according to the signal that Isobarically Control module exports, to control and the GATE of AC-DC control chip holds the break-make of the switching tube be connected.
2. the AC-DC control chip of single-stage height PFC according to claim 1, is characterized in that, described Isobarically Control module comprises:
First switch;
Second switch;
Elementary constant voltage unit, the difference for the signal held by AC-DC control chip FB and the first reference voltage is amplified, and the difference after amplifying is compared with built-in ramp signal, and output Isobarically Control signal is to logical AND driver module;
Secondary constant voltage unit, the turn-off time of the switching tube that the signal for AC-DC control chip FB end of sampling is corresponding, when described crest voltage is lower than the second reference voltage, reduces the turn-off time of described switching tube at next cycle; When described crest voltage is lower than the 3rd reference voltage, latches the now corresponding turn-off time, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube;
Voltage comparison unit, for the size of more described crest voltage and the second reference voltage, the 3rd reference voltage, and exports to described secondary constant voltage unit by comparative result; At described crest voltage, lower than controlling during the second reference voltage, the first switch disconnects, second switch closes, and at described crest voltage, higher than controlling during the second reference voltage, the first switch is closed, second switch disconnects;
The input of described elementary constant voltage unit be described Isobarically Control module first input end, connect the FB end of described AC-DC control chip; The output of described elementary constant voltage unit is connected one end of second switch by secondary constant voltage unit, is also connected the other end of second switch by the first switch; The other end of described second switch is output, the connection logical AND driver module of described Isobarically Control module; The input of described voltage comparison unit is the second input, the connection current sample maintenance module of described Isobarically Control module, first output of described voltage comparison unit connects the control end of secondary constant voltage unit and second switch, second output of described voltage comparison unit connects secondary constant voltage unit, and the 3rd output of described voltage comparison unit connects the control end of the first switch.
3. the AC-DC control chip of single-stage height PFC according to claim 2, is characterized in that, described secondary constant voltage unit also comprises:
Turn-off time gathers subelement, for the turn-off time of the switching tube of the FB end correspondence of AC-DC control chip of sampling;
Turn-off time controls subelement, for when described crest voltage is lower than the second reference voltage, obtain the turn-off time that turn-off time collection subelement is sampled for the last time, is multiplied by a coefficient this turn-off time, is set to the turn-off time of next cycle switching tube the turn-off time of being multiplied by coefficient; When described crest voltage is lower than the 3rd reference voltage, latches the turn-off time that the now turn-off time gathers subelement sampling, is fixed as the turn-off time of latch in subsequent cycle the turn-off time of switching tube;
Wherein, described coefficient is less than 1 and in direct ratio with described crest voltage.
4. the AC-DC control chip of single-stage height PFC according to claim 3, is characterized in that, described elementary constant voltage unit comprises controlling of sampling switch, the first electric capacity, error amplifier, the first comparator and the slope subelement for generation of ramp signal; One end of described controlling of sampling switch is the input of elementary constant voltage unit, the FB end of connection AC-DC control chip, and the other end of described controlling of sampling switch connects the inverting input of error amplifier, also by the first capacity earth; The normal phase input end of described error amplifier connects the first reference voltage providing end, the output of described error amplifier connects the normal phase input end of the first comparator, described slope subelement connects the inverting input of the first comparator, and the output of described first comparator is the output of described elementary constant voltage unit, connects secondary constant voltage unit and the first switch.
5. the AC-DC control chip of single-stage height PFC according to claim 4, it is characterized in that, described voltage comparison unit comprises the second comparator, 3rd comparator and inverter, the inverting input of described second comparator is the input of described voltage comparison unit, connect current sample and keep the output of module and the inverting input of the 3rd comparator, the normal phase input end of described second comparator connects the second reference voltage providing end, the normal phase input end of described 3rd comparator connects the 3rd reference voltage providing end, the output of described second comparator is the first output of voltage comparison unit, connect the control end of second switch, the input of secondary constant voltage unit and inverter, the output of described 3rd comparator is the second output of voltage comparison unit, connect secondary constant voltage unit, the output of described inverter is the 3rd output of voltage comparison unit, connect the control end of the first switch.
6. the AC-DC control chip of single-stage height PFC according to claim 5, is characterized in that, described AC-DC control chip also comprises built-in power module, for providing working power for described AC-DC control chip; Described built-in power module connects the VCC end of described AC-DC control chip.
7. the AC-DC control chip of single-stage height PFC according to claim 6, is characterized in that, described AC-DC control chip also comprises protection module, for providing overheat protector, output over-voltage protection and load short circuits to protect for described AC-DC control chip; Described protection module connects described logical AND driver module.
8. the AC-DC control chip of single-stage height PFC according to claim 7, is characterized in that, described first switch and second switch are the digital switch that high level closes, low level disconnects.
9. a switching power circuit, comprises the AC-DC control chip of the single-stage height PFC as described in claim 1-8 any one.
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