CN207339644U - A kind of controlled resonant converter - Google Patents
A kind of controlled resonant converter Download PDFInfo
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- CN207339644U CN207339644U CN201721027693.9U CN201721027693U CN207339644U CN 207339644 U CN207339644 U CN 207339644U CN 201721027693 U CN201721027693 U CN 201721027693U CN 207339644 U CN207339644 U CN 207339644U
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Abstract
This application discloses a kind of controlled resonant converter, including rectifier bridge, bus capacitor, switch element, resonant network, control unit, dividing cell and thermal compensation signal generation unit, wherein：Rectifier bridge positive output terminal connects one end of bus capacitor；Switch element input side parallel connection bus capacitor；Switch element lead-out terminal connects resonant network positive input terminal；Resonant network negative input terminal connects rectifier bridge negative output terminal；Dividing cell shunts positive resonance current and provides path for reverse resonance current；Control unit produces switching tube driving control signal according to the sampled signal of thermal compensation signal and characterization controlled resonant converter output parameter；Working frequency at thermal compensation signal instruction control unit rise rectifier bridge input voltage zero crossing, the working frequency at reduction rectifier bridge input voltage peak-to-valley value；Thermal compensation signal generation unit adjusts thermal compensation signal according to the change of resonant converter output power or rectifier bridge input voltage.The application improves the PF values of controlled resonant converter.
Description
Technical field
Power electronics field is the utility model is related to, more specifically to a kind of controlled resonant converter.
Background technology
Controlled resonant converter has the switching loss of smaller compared to traditional pwm converter, thus is widely used.
Specifically：Controlled resonant converter is using resonance circuit as basic transformation unit, and when resonance occurs using circuit, curtage is all
Phase property ground zero crossing so that switching device is opened or turned off under the conditions of no-voltage either zero current, so as to fulfill Sofe Switch,
Achieve the purpose that to reduce switching loss.
PFC (Power Factor Correction, PFC) technology of controlled resonant converter is power electronics skill
The heat subject of art area research.PF (Power Factor, power factor) value of controlled resonant converter is lower to increase power grid
Loss.In the prior art, in order to improve the PF values of controlled resonant converter, two-stage type structure is often designed to, prime is PFC electricity
Road, rear class are resonant transform circuit, and still, two-stage type complex structural designs are of high cost, a kind of using single it is therefore necessary to design
Level formula structure and the high controlled resonant converter of PF values.
Utility model content
In view of this, the utility model provides a kind of controlled resonant converter, it uses single stage type structure and PF values are high, scheme
It is as follows：
A kind of controlled resonant converter, including rectifier bridge, bus capacitor, switch element, resonant network, control unit, shunting list
Member and thermal compensation signal generation unit, wherein：
The positive output terminal of the rectifier bridge connects one end of the bus capacitor；
The input side of the switch element bus capacitor in parallel；
The lead-out terminal of the switch element connects the positive input terminal of the resonant network；
The negative input terminal of the resonant network connects the negative output terminal of the rectifier bridge；
The dividing cell is connected between the negative output terminal of the resonant network and the bus capacitor, for aligning
To resonance current shunted and provide path for reverse resonance current；
Described control unit receives thermal compensation signal and characterizes the sampled signal of the controlled resonant converter output parameter, and according to
The thermal compensation signal and the sampled signal produce driving control signal, and the driving control signal is exported to the switch element
In switching tube control terminal；Wherein, the thermal compensation signal raises the controlled resonant converter in institute for instruction described control unit
State the working frequency at rectifier bridge input voltage zero crossing, reduce the controlled resonant converter in the rectifier bridge input voltage peak value
With the signal of the working frequency at valley；
The thermal compensation signal generation unit is used to be inputted according to the reduction of resonant converter output power or the rectifier bridge
Voltage is raised to increase the peak-to-peak value of the thermal compensation signal.
Wherein, described control unit includes frequency control module and comparison module, specifically：
The comparison module receives the sampled signal, for the sampled signal to be made comparisons with default reference signal
Produce feedback signal；
The frequency control module receives the feedback signal and the thermal compensation signal, for according to the feedback signal and
The thermal compensation signal produces driving control signal.
Wherein, the output result of the frequency control module is the size of working frequency of the controlled resonant converter and described
The amplitude positive correlation of thermal compensation signal.
Wherein, the thermal compensation signal generation unit includes inverse ratio circuit and the circuit that takes large values, specifically：
The inverse ratio circuit receives the bus capacitor both end voltage, produces first voltage signal negatively correlated therewith；
The circuit that takes large values receives the first voltage signal and negative mother opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of the voltage signal of line, and select the first voltage signal and the second voltage signal
In higher value output.
Wherein, the thermal compensation signal generation unit includes direct ratio circuit and the circuit that takes large values, specifically：
The direct ratio circuit receives the output parameter of the controlled resonant converter, produces the output with the controlled resonant converter and joins
The positively related first voltage signal of number；
The circuit that takes large values receives the first voltage signal and negative mother opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of the voltage signal of line, and select the first voltage signal and the second voltage signal
In higher value output.
Wherein, the thermal compensation signal generation unit includes Contrary compensation operational amplifier circuit and the circuit that takes large values, specifically：
The sampled signal of the bus capacitor both end voltage is input to the reverse input end of the Contrary compensation operational amplifier circuit,
The sampled signal of the output parameter of the controlled resonant converter is input to the noninverting input of the Contrary compensation operational amplifier circuit, described
The output signal of Contrary compensation operational amplifier circuit is first voltage signal；
The circuit that takes large values receives the first voltage signal and negative mother opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of the voltage signal of line, and select the first voltage signal and the second voltage signal
In higher value output.
Wherein, the output result of the frequency control module is the size of working frequency of the controlled resonant converter and described
The amplitude of thermal compensation signal is negatively correlated.
Wherein, the thermal compensation signal generation unit includes direct ratio circuit and the circuit that gets the small value, specifically：
The direct ratio circuit receives the bus capacitor both end voltage, produces positively related first voltage signal therewith；
The circuit that gets the small value receives the first voltage signal and positively related with the outlet side voltage of the rectifier bridge
Second voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
Wherein, the thermal compensation signal generation unit includes inverse ratio circuit and the circuit that gets the small value, specifically：
The inverse ratio circuit receives the output parameter of the controlled resonant converter, produces the output with the controlled resonant converter and joins
The negatively correlated first voltage signal of number；
The circuit that gets the small value receives the first voltage signal and positively related with the outlet side voltage of the rectifier bridge
Second voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
Wherein, the thermal compensation signal generation unit includes compensation operational amplifier circuit in the same direction and the circuit that gets the small value, specifically：
The sampled signal of the bus capacitor both end voltage is input to the noninverting input of the operational amplifier circuit of compensation in the same direction,
The sampled signal of the output parameter of the controlled resonant converter is input to the reverse input end of the operational amplifier circuit of compensation in the same direction, described
The output signal of compensation operational amplifier circuit is first voltage signal in the same direction；
The circuit that gets the small value receives the first voltage signal and positively related with the outlet side voltage of the rectifier bridge
Second voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
It can be seen from the above technical scheme that the utility model is aligned by introducing dividing cell for controlled resonant converter
Shunted to resonance current and provide path for reverse resonance current, so that controlled resonant converter input current is become by square wave
To there is the sine wave necessarily to distort, and reduce by introducing thermal compensation signal or even eliminate this distortion, so that electric current
Controlled resonant converter input current is more nearly sine wave, improves the PF values of controlled resonant converter.Moreover, the utility model is adjusted in real time
The whole thermal compensation signal is to adapt to the change of resonant converter output power or controlled resonant converter input current, so that in environment
The PF values of controlled resonant converter are met the requirements all the time during change.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is a kind of controlled resonant converter structure diagram disclosed in the utility model embodiment；
Fig. 2 is a kind of dividing cell structure applied to controlled resonant converter shown in Fig. 1 disclosed in the utility model embodiment
Schematic diagram；
Fig. 3 is the dividing cell knot that another is applied to controlled resonant converter shown in Fig. 1 disclosed in the utility model embodiment
Structure schematic diagram；
Fig. 4 is the dividing cell knot that another is applied to controlled resonant converter shown in Fig. 1 disclosed in the utility model embodiment
Structure schematic diagram；
Fig. 5 is a kind of controlled resonant converter structure diagram disclosed in the prior art；
Fig. 6 is the current waveform figure of controlled resonant converter shown in Fig. 5；
Fig. 7 is the voltage of controlled resonant converter, current waveform figure shown in Fig. 5；
Fig. 8 accesses the structure diagram after dividing cell shown in Fig. 2 for controlled resonant converter shown in Fig. 5；
Fig. 9 is the voltage oscillogram of controlled resonant converter shown in Fig. 8；
Figure 10 is the current waveform figure of controlled resonant converter shown in Fig. 8；
Figure 11 is that controlled resonant converter shown in Fig. 8 introduces the structure diagram after thermal compensation signal；
Figure 12 is the current waveform figure of controlled resonant converter shown in Figure 11；
Figure 13 is a kind of control unit structure applied to controlled resonant converter shown in Fig. 2 disclosed in the utility model embodiment
Schematic diagram；
Figure 14 is that a kind of thermal compensation signal applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment is produced
Raw cellular construction schematic diagram；
The oscillogram of thermal compensation signal Ic in the controlled resonant converter that Figure 15 is applied by Figure 14；
The oscillogram of controlled resonant converter input current Iin in the controlled resonant converter that Figure 16 is applied by Figure 14；
Figure 17 is the thermal compensation signal that another is applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment
Generation unit structure diagram；
Figure 18 is the thermal compensation signal that another is applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment
Generation unit structure diagram；
The oscillogram of thermal compensation signal Ic in the controlled resonant converter that Figure 19 is applied by Figure 18；
Figure 20 is the thermal compensation signal that another is applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment
Generation unit structure diagram；
The oscillogram of thermal compensation signal Ic in the controlled resonant converter that Figure 21 is applied by Figure 20；
Figure 22 is the thermal compensation signal that another is applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment
Generation unit structure diagram；
Figure 23 is the thermal compensation signal that another is applied to controlled resonant converter shown in Figure 13 disclosed in the utility model embodiment
Generation unit structure diagram.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
Referring to Fig. 1, the utility model embodiment discloses a kind of controlled resonant converter, including rectifier bridge 100, bus capacitor
C2, switch element 200, resonant network 300, control unit 400, dividing cell 500 and thermal compensation signal generation unit 600, wherein：
One end of the positive output terminal connection bus capacitor C2 of rectifier bridge 100；
The input side parallel connection bus capacitor C2 of switch element 200；
The positive input terminal of the lead-out terminal connection resonant network 300 of switch element 200；
The negative output terminal of the negative input terminal connection rectifier bridge 100 of resonant network 300；
Dividing cell 500 is connected between the negative output terminal of resonant network 300 and bus capacitor C2, for forward direction
Resonance current ILr(resonance current is high frequency electric, and the resonance current under high frequency period is denoted as I by the present embodimentLr, resonance current
ILrPositive direction as shown by the arrows in Figure 1；Resonance current ILrActual direction and the positive direction mutually also referred to as positive resonance
Electric current ILr, resonance current ILrActual direction it is opposite with the positive direction when referred to as reverse resonance current ILr) shunted and
For reverse resonance current ILrPath is provided；
Control unit 400 receives thermal compensation signal Ic and characterizes the sampled signal Is of the output parameter of the controlled resonant converter,
And driving control signal is produced according to thermal compensation signal Ic and sampled signal Is, the driving control signal is exported to switch element
The control terminal of switching tube in 200；Wherein, thermal compensation signal Ic raises the controlled resonant converter whole for instruction control unit 400
Flow the working frequency at 100 input voltage zero crossing of bridge, reduce the controlled resonant converter in 100 input voltage peak value of rectifier bridge and
The signal of working frequency at valley；
Thermal compensation signal generation unit 600 is used to adjust thermal compensation signal Ic in real time to adapt to resonant converter output power or humorous
Shake the change of converter input voltage, specifically, reduction of the thermal compensation signal generation unit 600 according to resonant converter output power
Or the rise of 100 input voltage of rectifier bridge increases the peak-to-peak value of thermal compensation signal Ic.The peak-to-peak value of the thermal compensation signal Ic, is
The maximum a and the difference of minimum value b that finger thermal compensation signal Ic reaches in whole oscillatory process；Wherein, a is thermal compensation signal Ic whole
The magnitude of voltage at 100 input voltage zero crossing of bridge is flowed, b is thermal compensation signal Ic at 100 input voltage peak value of rectifier bridge and valley
Magnitude of voltage.
It should be noted that it can also be AC signal that thermal compensation signal Ic, which can be direct current signal,.When thermal compensation signal Ic is
When direct current signal, the peak-to-peak value of the thermal compensation signal Ic, refers to the peak-to-peak value of the ripple component in direct current signal.
In addition it should also be noted that, transformer and secondary circuit in controlled resonant converter are the prior art, this practicality is new
Type embodiment is not described and limits to this.
In above-mentioned controlled resonant converter disclosed in the utility model embodiment, switch element 200 can use as shown in Figure 1
Topological structure, including the first switch pipe and second switch pipe (i.e. the upper, lower tube shown in Fig. 1) being in series, wherein：Described
The first end of one switching tube and the input side that the second end of the second switch pipe is switch element 200；The first switch pipe
Second end be connected with the first end of the second switch pipe, as the lead-out terminal of switch element 200, the first switch pipe
The 3rd end with the second switch pipe is the control terminal of the first switch pipe and the second switch pipe.
In above-mentioned controlled resonant converter disclosed in the utility model embodiment, the topological classification of resonant network 300 is unlimited, can be with
It is LLC resonant networks, LCC resonant networks or other topological classifications, Fig. 1 is only used as example using LLC resonant networks.It is described in Fig. 1
LLC resonant elements include resonant inductance Lr, magnetizing inductance Lm and resonant capacitance Cr, wherein：One end connection of resonant inductance Lr is opened
Close the lead-out terminal of unit 200, one end of other end connection magnetizing inductance Lm；The other end connection resonant capacitance of magnetizing inductance Lm
One end of Cr, the negative output terminal of the other end connection rectifier bridge 100 of resonant capacitance Cr.Herein it should be noted that excitation is electric
Sense Lm can be external inductance or be integrated in the transformer of the controlled resonant converter.
In above-mentioned controlled resonant converter disclosed in the utility model embodiment, dividing cell 500 can use following three kinds of topologys
Any one in type, is described in detail below：
1) the first topological classification of dividing cell 500 includes diode D1 and the first capacitance C1；The cathode of diode D1
Connect the negative output terminal of rectifier bridge 100, the negative terminal of the anode connection bus capacitor C2 of diode D1；First capacitance C1 and two poles
Pipe D1 is in parallel, as shown in Figure 2；
2) second of topological classification of dividing cell 500 includes diode D1 and the 3rd capacitance C3；The cathode of diode D1
Connect the negative output terminal of rectifier bridge 100, the negative terminal of the anode connection bus capacitor C2 of diode D1；One end of 3rd capacitance C3
The cathode of diode D1 is connected, the other end of the 3rd capacitance C3 connects the hot end of the bus capacitor C2, as shown in Figure 3；
3) the third topological classification of dividing cell 500 is on the basis of second of topological classification, further includes the
Four capacitance C4；4th capacitance C4 is in parallel with diode D1, as shown in Figure 4.
In the following, by taking Fig. 2 as an example, the operation principle of controlled resonant converter disclosed in the utility model embodiment is described in detail.
First, in the prior art the structure of controlled resonant converter as shown in figure 5, including rectifier bridge 100, bus capacitor C2, opening
Unit 200, resonant network 300 and control unit 400 are closed, wherein：
The outlet side parallel connection bus capacitor C2 of rectifier bridge 100；
The input side parallel connection bus capacitor C2 of switch element 200；
The positive input terminal of the lead-out terminal connection resonant network 300 of switch element 200；
The negative output terminal of the negative input terminal connection rectifier bridge 100 of resonant network 300；
Control unit 400 receives the sampled signal Is for the output parameter for characterizing the controlled resonant converter, its signal output part
The control terminal of switching tube in connecting valve unit 200, for the switching tube in sampled signal Is controlling switches unit 200
Working frequency so that sampled signal Is reaches default reference signal.
Controlled resonant converter shown in Fig. 5 has three kinds of operating modes, is f respectivelyr＜ fs＜ fo、fs=foAnd fs>foWhen correspond to
Operating mode,fsFor the resonant frequency of resonant network 300.Below with fr＜ fs
＜ foExemplified by, the work wave of controlled resonant converter shown in analysis chart 5.
Resonance current I in controlled resonant converter shown in Fig. 5Lr(resonance current ILrPositive direction as shown by the arrows in Figure 5) and
The waveform of the electric current of rectifier bridge 100 is flowed through respectively referring to waveform B 1 shown in Fig. 6, B2 (Ts represents a switch periods), by
In only positive resonance current ILrRectifier bridge 100 can just be flowed through and reverse resonance current ILrRectifier bridge 100 cannot be flowed through,
Therefore the electric current for flowing through rectifier bridge 100 is exactly resonance current I when current value is more than zeroLr。
Resonance current ILrFor high frequency electric, its frequency is identical with the working frequency of controlled resonant converter, flows through rectifier bridge 100
Positive resonance current is also high frequency electric, and still, influence PF values is the converter input voltage, the electric current under power frequency period
Waveform, specifically：In the case where the controlled resonant converter input voltage and output power are constant, resonance current ILrIt is constant,
So the electric current for flowing through rectifier bridge 100 is also just constant, so 100 input current Iin of rectifier bridge is square wave under power frequency period, such as scheme
(Vin in Fig. 7 represents 100 input voltage of rectifier bridge, is sine wave shown in 7；100 input voltage of rectifier bridge, electric current are resonance
Converter input voltage, electric current).The waveform of known Iin and Vin are closer, and the PF values of controlled resonant converter are higher, and Vin is
Sine wave, so Iin is higher closer to sine wave, the PF values of controlled resonant converter.But as shown in Figure 7, become in resonance shown in Fig. 5
In parallel operation, Iin is but square wave, so the PF values of controlled resonant converter shown in Fig. 5 are relatively low.
To improve the PF values of controlled resonant converter shown in Fig. 5, the present embodiment has accessed Fig. 1 in controlled resonant converter shown in Fig. 5
In the dividing cell 500 that shows, using dividing cell 500 to positive resonance current ILrShunted.Become with resonance shown in Fig. 5
Exemplified by that is accessed in parallel operation is dividing cell 500 shown in Figure 2, as shown in figure 8, positive resonance current ILrA part flows through
Rectifier bridge 100 (is denoted as electric current Idc), and another part flows through the capacitance C1 (being denoted as electric current Id) in dividing cell 500, ILr=Idc+
Id；Diode D1 in dividing cell 500 is used for the resonance current I for ending forward directionLr, that is, shunt after resonance current Id flow through electricity
Hold C1, rather than diode D1, meanwhile, diode D1 is reverse resonance current ILrPath is provided.
In fig. 8, Id flows through capacitance C1 generation voltage Vd, at this time capacitance C1 both end voltages Vd, bus capacitor C2 both ends electricity
Meet relational expression Vd=Vbus-Vdc between pressure Vbus, 100 outlet side voltage Vdc three of rectifier bridge.The waveform of Vd, Vbus, Vdc
As shown in Figure 9.
The shunting of dividing cell 500 really high frequency electric, envelope shape and Vd phase of its electric current under power frequency period
Together, and due to Idc=ILr- Id, then Idc, I under power frequency periodL(resonance current under power frequency period is denoted as by the present embodiment
IL, with the resonance current I under high frequency periodLrDistinguish), the waveform of Id, Iin it is as shown in Figure 10, although Iin in Figure 10 is than figure
Iin in 9 is closer to sine wave, but since the DC component of Id is very big, so the waveform of Iin still has distortion compared to sine wave.
But observation Figure 10 is can be found that, if it is possible to removes or reduce the DC component of Id, then the Iin obtained is just closer to sine wave.
To remove or reducing the DC component of Id in Figure 10, the present embodiment injecting compensating signal Ic is obtained to control unit 400
Controlled resonant converter as shown in figure 11 is arrived.Injecting compensating signal Ic can change the working frequency of controlled resonant converter, so as to change humorous
Shake electric current ILr, and the working frequency for changing controlled resonant converter will not change the waveform of Id (or Vd), so, the present embodiment injection is mended
Signal Ic is repaid to control unit 400 so that the working frequency of the controlled resonant converter is not only related to sampled signal Is, also and mends
Repay signal Ic correlations；In other words, control unit 400 can control controlled resonant converter according to sampled signal Is and thermal compensation signal Ic
Working frequency.Specifically, the thermal compensation signal Ic of injection needs to meet：The thermal compensation signal Ic of injection enables to controlled resonant converter
Working frequency is and minimum in controlled resonant converter input voltage peak value and valley in controlled resonant converter input voltage zero crossing highest,
So that resonance current ILrIt is minimum in controlled resonant converter input voltage zero crossing, and in controlled resonant converter input voltage peak value and
Valley highest, therefore, the resonance current I under power frequency periodLAlso it is minimum in controlled resonant converter input voltage zero crossing, and in resonance
Converter input voltage peak value and valley highest, as shown in figure 12.
Referring to Figure 12, increase thermal compensation signal Ic does not change the current waveform of dividing cell 500, therefore is flowed through under power frequency period
The electric current Id waveforms of dividing cell 500 are constant, and increase the resonance current I after thermal compensation signal Ic under power frequency periodLWaveform changes
Become, so flowing through the electric current Idc waveform changes of rectifier bridge 100 (by Idc=IL- Id understands that the DC component of Idc reduces), this
When add the input current Iin of rectifier bridge 100 after thermal compensation signal Ic and be more nearly sine wave, therefore resonant transformation shown in Figure 11
The PF value highers of device, THD (TotalHarmonic Distortion, total harmonic distortion) are lower.
Wherein, control unit 400 can use topological structure as shown in figure 13, including frequency control module 401 and compare mould
Block 402；Comparison module 402 is using the sampled signal Is of the output parameter of controlled resonant converter as input signal, for sampling to be believed
Number Is makes comparisons with default reference signal Vref produces feedback signal；The signal output part connection of frequency control module 401 is opened
The control terminal of the switching tube in unit 200 is closed, it is used as input using the feedback signal that thermal compensation signal Ic and comparison module 402 export
Signal, on the one hand according to the working frequency of controlled resonant converter in the feedback signal controlling switch unit 200, makes sampled signal Is
Equal to reference signal, on the other hand (switch is single for the working frequency of the switching tube in thermal compensation signal Ic controlling switches unit 200
Member 200 in switching tube working frequency be exactly controlled resonant converter working frequency), with improve the controlled resonant converter PF values with
THD。
Wherein, the output result of frequency control module 401 can be the working frequency of the controlled resonant converter size and
The amplitude positive correlation of thermal compensation signal Ic or the width of the size of the working frequency of the controlled resonant converter and thermal compensation signal Ic
Value is negatively correlated.
When the output of frequency control module 401 is the result is that the size and thermal compensation signal of the working frequency of the controlled resonant converter
During the amplitude positive correlation of Ic, the wave character of thermal compensation signal Ic includes：The amplitude of thermal compensation signal Ic is defeated in the controlled resonant converter
Enter highest at voltage over zero, minimum at the controlled resonant converter input voltage peak value and valley, the frequency of thermal compensation signal Ic
It is identical with the controlled resonant converter input voltage frequency.Such as the waveform of thermal compensation signal Ic can be made identical with Id (or Vd)
It is or directly proportional, then the resonance current I under power frequencyLWaveform can become as shown in figure 12, at this time Idc DC component reduce,
So that the Iin after adding thermal compensation signal Ic is more nearly sine wave, so as to improve PF values, THD is reduced.
When the output of frequency control module 401 is the result is that the size and thermal compensation signal of the working frequency of the controlled resonant converter
When the amplitude of Ic is negatively correlated, the wave character of thermal compensation signal Ic includes：The amplitude of thermal compensation signal Ic is defeated in the controlled resonant converter
Enter minimum at voltage over zero, the highest at the controlled resonant converter input voltage peak value and valley, the frequency of thermal compensation signal Ic
It is identical with the controlled resonant converter input voltage frequency.
As seen from the above description, the present embodiment for controlled resonant converter by introducing dividing cell 500 come to positive resonance electricity
Stream is shunted and provides path for reverse resonance current, so that controlled resonant converter input current is changed into existing from square wave
The sine wave necessarily to distort, and the present embodiment reduces by introducing thermal compensation signal Ic or even eliminates this distortion, so that
Obtain current resonance converter input current and be more nearly sine wave, improve controlled resonant converter PF values and THD.
Need exist for explanation, thermal compensation signal Ic introduced above to improve the analysis of the PF values of controlled resonant converter, be
Give tacit consent to the analysis made in the case that resonant converter output power is constant and the input voltage vin of rectifier bridge 100 is constant, this
When the size of thermal compensation signal Ic that sets can be fixed.But in view of the actually output power of controlled resonant converter and
Vin inevitably changes, and to improve system self-adaption ability, the utility model embodiment increases on the basis of Figure 11
Thermal compensation signal generation unit 600, has obtained controlled resonant converter as shown in Figure 2.
In controlled resonant converter as shown in Figure 2, thermal compensation signal generation unit 600 is used to produce thermal compensation signal Ic, and in real time
Thermal compensation signal Ic is adjusted to adapt to the change of the output power of controlled resonant converter or Vin, specifically, thermal compensation signal generation unit
600 increase the peak-to-peak value of thermal compensation signal Ic according to the reduction of resonant converter output power or the rise of Vin.The compensation
The peak-to-peak value of signal Ic, refers to the difference for the maximum a and minimum value b that thermal compensation signal Ic reaches in whole oscillatory process, its
In, a is magnitudes of voltage of the thermal compensation signal Ic at Vin zero crossings, and b is magnitudes of voltage of the thermal compensation signal Ic at Vin peak values and valley.
So as to for the controlled resonant converter input current abnormality caused by with the reduction of resonant converter output power or the rise of Vin
The intensification of degree, the present embodiment make the degree of compensation of thermal compensation signal Ic more and more deeper, so that the PF values of controlled resonant converter are all the time
Meet the requirements.
That is, whether when the output of frequency control module 401 is the result is that the working frequency of the controlled resonant converter
Size and thermal compensation signal Ic amplitude positive correlation or it is negatively correlated when, the wave character of thermal compensation signal Ic further includes：With Vin
Bigger or as resonant converter output power is smaller, the peak-to-peak value of thermal compensation signal Ic is also bigger.
In the following, the topological structure of thermal compensation signal generation unit 600 in controlled resonant converter shown in Fig. 2 is illustrated,
Specific descriptions see below 1) -6).
1) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude positive correlation of number Ic, and require thermal compensation signal generation unit 600 to adjust compensation with the change of controlled resonant converter input voltage
During signal Ic, thermal compensation signal generation unit 600 can be with the voltage signal (note identical or directly proportional with capacitance C1 both end voltages Vd
For V2) and bus capacitor C2 both end voltages Vbus as input, thermal compensation signal generation unit 600 makes thermal compensation signal Ic's according to V2
Waveform and Id (or Vd) are identical or directly proportional, then the resonance current I under power frequencyLWaveform can become as shown in figure 12, at the same time
Thermal compensation signal generation unit 600 adjusts thermal compensation signal Ic according to Vbus, since Vbus and Vin is relevant, so according to Vbus
Thermal compensation signal Ic is adjusted, is also achieved that adjustment thermal compensation signal Ic is so that it changes with Vin, so as to obtain above-mentioned tool in real time
There is the thermal compensation signal Ic of wave character.
Specifically, thermal compensation signal generation unit 600 can use topological structure as shown in figure 14, including 601 He of inverse ratio circuit
Take large values circuit 602, wherein：Inverse ratio circuit 601 receives bus capacitor C2 both end voltage Vbus, produces the first of negative correlation therewith
Voltage signal V1；The circuit 602 that takes large values receives V1 and the second voltage signal identical or directly proportional with capacitance C1 both end voltages Vd
V2 (Vd is voltage signal of the negative output terminal with respect to negative busbar of rectifier bridge 10), and select the output of the higher value in V1 and V2.
Under topological structure as shown in figure 14, the waveform of V2 is identical or directly proportional with Vd, and the waveform and Vbus of V1 is negatively correlated, i.e.,
Vbus is bigger, and V1 is smaller, and the waveform of V1, V2 and thermal compensation signal Ic are as shown in figure 15.Thermal compensation signal Ic is maximum in Vin zero crossings,
Therefore at Vin zero crossings controlled resonant converter working frequency fsHigher, then Iin is minimum at this time；Thermal compensation signal Ic in Vin peak values and
Valley is minimum, therefore f at Vin peak-to-valley valuessSmaller, then Iin is maximum at this time；Thermal compensation signal Ic, working frequency fs, introduce compensation letter
Controlled resonant converter input current Iin ' before number Ic and the relation for introducing the controlled resonant converter input current Iin after thermal compensation signal Ic
As shown in figure 16.
Under topological structure shown in Figure 14, when Vin is in minimum point, the peak-to-peak value most I of thermal compensation signal Ic is 0, that is, is mended
It is straight line to repay signal Ic.In a specific embodiment, the constant thermal compensation signal Ic of amplitude, can set in order to obtain
First voltage signal V1 is more than second voltage signal V2, and by taking large values, circuit 602 takes out thermal compensation signal Ic=V1, i.e. compensation letter
Number Ic is not as Vin zero crossings and peak-to-valley value change, at this time, although thermal compensation signal Ic can influence whole controlled resonant converter
Working frequency, but it is identical to the operating frequency influences of each point, therefore Iin waveforms will not be impacted.And as Vin increases
Add, V1 reduces, and V2 increases, the peak-to-peak value of thermal compensation signal Ic is bigger, is arranged such so that when input voltage vin increases, input
Electric current Iin equally changes (closer to sine wave), to prevent that PF values and THD deteriorate caused by Vin from increasing.
2) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude positive correlation of number Ic, and require thermal compensation signal generation unit 600 to adjust compensation with the change of resonant converter output power
During signal Ic, thermal compensation signal generation unit 600 can be with controlled resonant converter output parameter (such as controlled resonant converter output voltage Vo
With output current Io) and the voltage signal V2 identical or directly proportional with capacitance C1 both end voltages Vd conduct inputs, thermal compensation signal
Generation unit 600 makes the waveform of thermal compensation signal Ic and Id (or Vd) identical or directly proportional according to V2, then the resonance electricity under power frequency
Flow ILWaveform can become as shown in figure 12, while thermal compensation signal generation unit 600 according to Vo, Io adjust thermal compensation signal Ic, by
It is relevant in Vo, Io and resonant converter output power, so adjusting thermal compensation signal Ic according to Vo and Io, is also achieved that reality
When adjust thermal compensation signal Ic so that it changes with resonant converter output power, so as to obtain with above-mentioned wave character
Thermal compensation signal Ic.
Specifically, thermal compensation signal generation unit 600 can use topological structure as shown in figure 17, including 601 He of direct ratio circuit
Take large values circuit 602, wherein：Direct ratio circuit 601 receives controlled resonant converter output parameter, produces and controlled resonant converter output parameter
Positively related first voltage signal V1；The circuit 602 that takes large values receives V1 and identical or directly proportional with capacitance C1 both end voltages Vd
Second voltage signal V2, and select the output of the higher value in V1 and V2.
3) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude positive correlation of number Ic, and require thermal compensation signal generation unit 600 to be adjusted with the change of Vin or resonant converter output power
During thermal compensation signal Ic, thermal compensation signal generation unit 600 can use topological structure as shown in figure 18, including Contrary compensation amplifier electricity
Road 601 and the circuit 602 that takes large values, wherein：
The sampled signal of Vbus is input to the reverse input end of Contrary compensation operational amplifier circuit 601, controlled resonant converter output ginseng
The sampled signal of number (such as controlled resonant converter output voltage Vo and output current Io) is input to Contrary compensation operational amplifier circuit 601
Noninverting input, the output signal of Contrary compensation operational amplifier circuit 601 is first voltage signal V1；The circuit 602 that takes large values receives V1
With the second voltage signal V2 identical or directly proportional with capacitance C1 both end voltages Vd, and select the higher value in V1 and V2 output.
When resonant converter output power is maximum and controlled resonant converter input current is minimum, V1 is maximum, if V1=at this time
V1max >=V2, as shown in figure 19, thermal compensation signal Ic such as Ic1 show a direct current signal at this time, and thermal compensation signal Ic becomes resonance
Parallel operation input current waveform does not have an impact.With the increase of Vo and/or the reduction of Vin, V1 is less and less, and V2 only with
The reduction of Vin and reduce, so Ic=max (V1, V2), as shown in Ic2, and with the increase of Vo and/or the reduction of Vin, △ I
Increasing, i.e. the peak-to-peak value of thermal compensation signal Ic is increasing, i.e., degree of compensation is more and more deeper.
Above-mentioned 1) -3) in, the influence of resonant converter output power and input voltage to PF values has been taken into account so that various defeated
In the case of entering and exporting, PF values are held at high value.
4) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude of number Ic is negatively correlated, and when requiring the thermal compensation signal generation unit 600 to adjust thermal compensation signal Ic with the change of Vin, compensation letter
Number generation unit 600 can use topological structure as shown in figure 20, including direct ratio circuit 601 and the circuit 602 that gets the small value, wherein：
Direct ratio circuit 601 receives bus capacitor C2 both end voltage Vbus, produces positively related first voltage signal V1 therewith；
The circuit 602 that gets the small value receive V1 and with the 100 positively related second voltage signal V2 of outlet side voltage Vdc of rectifier bridge, and select V1 and
Smaller value output in V2.The waveform of V1, V2 and thermal compensation signal Ic are as shown in figure 21.
5) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude of number Ic is negatively correlated, and requires thermal compensation signal generation unit 600 to adjust compensation with the change of resonant converter output power
During signal Ic, thermal compensation signal generation unit 600 can use topological structure as shown in figure 22, including inverse ratio circuit 601 and take small
It is worth circuit 602, wherein：Inverse ratio circuit 601 receives controlled resonant converter output parameter (such as controlled resonant converter output voltage Vo and defeated
Go out electric current Io), produce the first voltage signal V1 with controlled resonant converter output parameter negative correlation；The circuit 602 that gets the small value receives V1
With the positively related second voltage signal V2 of outlet side voltage Vdc with rectifier bridge 100, and select the smaller value in V1 and V2 output.
6) when the output of frequency control module 401 is the result is that the size and compensation letter of the working frequency of the controlled resonant converter
The amplitude of number Ic is negatively correlated, and requires thermal compensation signal generation unit 600 to be adjusted with the change of Vin or resonant converter output power
During thermal compensation signal Ic, thermal compensation signal generation unit 600 can use topological structure as shown in figure 23, including compensation amplifier electricity in the same direction
Road 601 and the circuit 602 that gets the small value, wherein：
The sampled signal of Vbus is input to the noninverting input of compensation operational amplifier circuit 601 in the same direction, controlled resonant converter output ginseng
The sampled signal of number (such as controlled resonant converter output voltage Vo and output current Io) is input to compensates operational amplifier circuit 601 in the same direction
Reverse input end, the output signal for compensating operational amplifier circuit 601 in the same direction is first voltage signal V1；The circuit 602 that gets the small value receives V1
With the positively related second voltage signal V2 of outlet side voltage Vdc with rectifier bridge 100, and select the smaller value in V1 and V2 output.
Above-mentioned 4) -6) in, the influence of resonant converter output power and input voltage to PF values has equally been taken into account so that each
In the case of kind is output and input, PF values are held at high value.
In conclusion the utility model divides positive resonance current by introducing dividing cell for controlled resonant converter
Flow and provide path for reverse resonance current, so that controlled resonant converter input current is changed into having what is necessarily distorted from square wave
Sine wave, and reduce by introducing thermal compensation signal or even eliminate this distortion, so that current resonance converter input electricity
Stream is more nearly sine wave, improves the PF values of controlled resonant converter.Moreover, the utility model adjust in real time the thermal compensation signal with
The change of resonant converter output power or controlled resonant converter input current is adapted to, so that the controlled resonant converter in environmental change
PF values meet the requirements all the time.
Finally it should be noted that switching and resonant network 300 and the dividing cell of 300 operating mode of resonant network
The change of 500 topological classifications, all without the realization for changing above-mentioned technique effect, its analysis principle is identical, no longer goes to live in the household of one's in-laws on getting married one by one herein
State.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, without necessarily requiring or implying there are any this reality between these entities or operation
Relation or order.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be real in other embodiments in the case where not departing from the spirit or scope of the utility model embodiment
It is existing.Therefore, the utility model embodiment is not intended to be limited to the embodiments shown herein, and is to fit to and this paper institutes
Principle disclosed and the consistent most wide scope of features of novelty.
Claims (10)
1. a kind of controlled resonant converter, it is characterised in that single including rectifier bridge, bus capacitor, switch element, resonant network, control
Member, dividing cell and thermal compensation signal generation unit, wherein：
The positive output terminal of the rectifier bridge connects one end of the bus capacitor；
The input side of the switch element bus capacitor in parallel；
The lead-out terminal of the switch element connects the positive input terminal of the resonant network；
The negative input terminal of the resonant network connects the negative output terminal of the rectifier bridge；
The dividing cell is connected between the negative output terminal of the resonant network and the bus capacitor, for forward direction
Resonance current is shunted and provides path for reverse resonance current；
Described control unit receives thermal compensation signal and characterizes the sampled signal of the output parameter of the controlled resonant converter, and according to institute
State thermal compensation signal and the sampled signal produces driving control signal, the driving control signal is exported into the switch element
Switching tube control terminal；Wherein, the thermal compensation signal raises the controlled resonant converter described for instruction described control unit
Working frequency at rectifier bridge input voltage zero crossing, reduce the controlled resonant converter in the rectifier bridge input voltage peak value and
The signal of working frequency at valley；
The thermal compensation signal generation unit is used for reduction or the rectifier bridge input voltage according to resonant converter output power
Rise increase the peak-to-peak value of the thermal compensation signal.
2. controlled resonant converter according to claim 1, it is characterised in that described control unit include frequency control module and
Comparison module, wherein：
The comparison module receives the sampled signal, for the sampled signal to be made comparisons generation with default reference signal
Feedback signal；
The frequency control module receives the feedback signal and the thermal compensation signal, for according to the feedback signal and described
Thermal compensation signal produces driving control signal.
3. controlled resonant converter according to claim 2, it is characterised in that the output result of the frequency control module is institute
State the amplitude positive correlation of the size and the thermal compensation signal of the working frequency of controlled resonant converter.
4. controlled resonant converter according to claim 3, it is characterised in that the thermal compensation signal generation unit includes inverse ratio electricity
Road and the circuit that takes large values, wherein：
The inverse ratio circuit receives the bus capacitor both end voltage, produces first voltage signal negatively correlated therewith；
The circuit that takes large values receives the first voltage signal and negative busbar opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of voltage signal, and select in the first voltage signal and the second voltage signal
Higher value exports.
5. controlled resonant converter according to claim 3, it is characterised in that the thermal compensation signal generation unit includes direct ratio electricity
Road and the circuit that takes large values, wherein：
The direct ratio circuit receives the output parameter of the controlled resonant converter, produces with the output parameter of the controlled resonant converter just
Relevant first voltage signal；
The circuit that takes large values receives the first voltage signal and negative busbar opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of voltage signal, and select in the first voltage signal and the second voltage signal
Higher value exports.
6. controlled resonant converter according to claim 3, it is characterised in that the thermal compensation signal generation unit includes reversely mending
Operational amplifier circuit and the circuit that takes large values are repaid, wherein：
The sampled signal of the bus capacitor both end voltage is input to the reverse input end of the Contrary compensation operational amplifier circuit, described
The sampled signal of the output parameter of controlled resonant converter is input to the noninverting input of the Contrary compensation operational amplifier circuit, described reverse
The output signal for compensating operational amplifier circuit is first voltage signal；
The circuit that takes large values receives the first voltage signal and negative busbar opposite with the negative output terminal of the rectifier bridge
The identical or directly proportional second voltage signal of voltage signal, and select in the first voltage signal and the second voltage signal
Higher value exports.
7. controlled resonant converter according to claim 2, it is characterised in that the output result of the frequency control module is institute
State the size of the working frequency of controlled resonant converter and the amplitude negative correlation of the thermal compensation signal.
8. controlled resonant converter according to claim 7, it is characterised in that the thermal compensation signal generation unit includes direct ratio electricity
Road and the circuit that gets the small value, wherein：
The direct ratio circuit receives the bus capacitor both end voltage, produces positively related first voltage signal therewith；
The circuit that gets the small value receives the first voltage signal and the outlet side voltage positively related second with the rectifier bridge
Voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
9. controlled resonant converter according to claim 7, it is characterised in that the thermal compensation signal generation unit includes inverse ratio electricity
Road and the circuit that gets the small value, wherein：
The inverse ratio circuit receives the output parameter of the controlled resonant converter, produces and is born with the output parameter of the controlled resonant converter
Relevant first voltage signal；
The circuit that gets the small value receives the first voltage signal and the outlet side voltage positively related second with the rectifier bridge
Voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
10. controlled resonant converter according to claim 7, it is characterised in that the thermal compensation signal generation unit includes in the same direction
Compensation operational amplifier circuit and the circuit that gets the small value, wherein：
The sampled signal of the bus capacitor both end voltage is input to the noninverting input of the operational amplifier circuit of compensation in the same direction, described
The sampled signal of the output parameter of controlled resonant converter is input to the reverse input end of the operational amplifier circuit of compensation in the same direction, described in the same direction
The output signal for compensating operational amplifier circuit is first voltage signal；
The circuit that gets the small value receives the first voltage signal and the outlet side voltage positively related second with the rectifier bridge
Voltage signal, and select the output of the smaller value in the first voltage signal and the second voltage signal.
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|---|---|---|---|
| CN201721027693.9U CN207339644U (en) | 2017-08-16 | 2017-08-16 | A kind of controlled resonant converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721027693.9U CN207339644U (en) | 2017-08-16 | 2017-08-16 | A kind of controlled resonant converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257195A (en) * | 2017-08-16 | 2017-10-17 | 英飞特电子（杭州）股份有限公司 | A kind of controlled resonant converter |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257195A (en) * | 2017-08-16 | 2017-10-17 | 英飞特电子（杭州）股份有限公司 | A kind of controlled resonant converter |
| CN107257195B (en) * | 2017-08-16 | 2023-08-18 | 英飞特电子（杭州）股份有限公司 | Resonant converter |
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