CN110190754A - Converter control circuit and chip - Google Patents
Converter control circuit and chip Download PDFInfo
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- CN110190754A CN110190754A CN201910513106.4A CN201910513106A CN110190754A CN 110190754 A CN110190754 A CN 110190754A CN 201910513106 A CN201910513106 A CN 201910513106A CN 110190754 A CN110190754 A CN 110190754A
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- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 15
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- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
It includes: target transformer, two clamp diodes, two switching devices, main side capacitor, third diode, control unit that the embodiment of the present application, which provides a kind of converter control circuit and chip, converter control circuit,；Target transformer includes first siding ring, second siding ring；The both ends of first siding ring are connect with two switching devices respectively, and the both ends of first siding ring are also connect with two clamp diodes respectively；A diode in two clamp diodes is through main when capacitance connection is main；One end of second siding ring is connect with secondary side, and the other end of second siding ring is connect with third diode；The input terminal of control unit and main side capacitance connection, two output ends of control unit are connect with two switching devices respectively；Control unit is used to adjust the turn-on time of two switching devices according to the voltage of main side capacitor, to adjust the output voltage of second siding ring.It can be controlled without devices such as additional photoelectrical coupler, auxiliary windings with this.
Description
Technical field
This application involves converter technology fields, in particular to a kind of converter control circuit and chip.
Background technique
Flyback converter is commonly applied in the lesser equipment of power consumption because topological structure is simple, number of elements is less.
At present for the control mode of flyback converter, mainly pass through the isolators such as additional optocoupler, auxiliary winding
Part obtains the secondary side voltage or electric current of transformer, is further carried out according to secondary side voltage or electric current to the switching tube of primary side
Control.
Summary of the invention
In view of this, the embodiment of the present application is designed to provide a kind of converter control circuit and chip, so that being not necessarily to
It uses the devices such as additional optocoupler, auxiliary winding to obtain secondary side signal again to control with the switching tube to primary side.
In a first aspect, the embodiment of the present application provides a kind of converter control circuit, the converter control circuit includes:
Target transformer, two clamp diodes, two switching devices, main side capacitor, third diode, control unit；
The target transformer includes first siding ring, second siding ring；
The both ends of the first siding ring are connect with described two switching devices respectively, and the both ends of the first siding ring are also
It is connect respectively with described two clamp diodes；
A diode in described two clamp diodes is by described main when capacitance connection is main；
One end of the second siding ring is connect with secondary side, the other end of the second siding ring and the three or two pole
Pipe connection；
The input terminal of described control unit and the main side capacitance connection, two output ends of described control unit respectively with
Described two switching device connections；
Described control unit is used to adjust the turn-on time of described two switching devices according to the voltage of the main side capacitor,
To adjust the output voltage of the second siding ring.
In said structure, control unit can according to it is main while it is main while capacitor voltage switching device is controlled,
Control can be realized according only to the signal on main side, obtain secondary side signal without devices such as optocoupler, auxiliary windings.Relatively
It is more simplified in the structure of existing control mode, above-mentioned converter control circuit.
In a kind of possible design, described control unit includes sample circuit, amplifying circuit, oscillating circuit；
The input terminal of the sample circuit and the main side capacitance connection, the output end of the sample circuit and the amplification
One input terminal of circuit connects；
Another input terminal of the amplifying circuit is for accessing a reference voltage, the output end of the amplifying circuit and institute
State the input terminal connection of oscillating circuit；
Two output ends of the oscillating circuit are connect with described two switching devices respectively；
The sample circuit is used to obtain sampled signal according to the voltage of the main side capacitor, and the sampled signal is passed
Transport to the amplifying circuit；
The conducting for the described two switching devices of Signal Regulation that the oscillating circuit is used to be exported according to the amplifying circuit
Time.
By above-mentioned implementation, sample circuit, amplifying circuit, oscillating circuit cooperate, can be according to main side capacitor
Voltage regulating switch device turn-on time, realize the adjusting of duty ratio.
In a kind of possible design, the sample circuit includes first resistor, second resistance；
The first resistor and the second resistance it is in series series circuit it is in parallel with the main side capacitor；
Wherein, the second resistance and the node of first resistor connection are connect with the amplifying circuit.
By above-mentioned implementation, first resistor, second resistance can be used as sampling resistor, according to the voltage of main side capacitor
And the available sampled signal of partial pressure situation of first resistor, second resistance.
In a kind of possible design, the oscillating circuit includes comparator, ramp signal generator, latch, switch
Driver；
The first input end of the comparator is connect with the amplifying circuit, the second input terminal of the comparator with it is described
Ramp signal generator connection；
The output end of the comparator is connect with the latch, and the latch is connect with described two switching devices,
The switch driver for driving switch device is equipped between the latch and each switching device.
By above-mentioned implementation, what the signal and ramp signal generator that comparator can export amplifying circuit exported
Ramp signal compares and exports comparison result signal, and the comparison result signal that latch can be exported according to comparator exports
Two control signals, this two control signals are respectively used to control two switching devices on main side.Wherein, each switching device quilt
It is configured to that there is corresponding switch driver to be driven.
In a kind of possible design, the latch is S/R latch；
The end R of the S/R latch is connect with the output end of the comparator；
The end S of the S/R latch is connect with a clock generator；
Two output ends of the S/R latch are connect with described two switching devices respectively, and two of the S/R latch
The switch driver for driving switch device is equipped between output end and described two switching devices.
By above-mentioned implementation, S/R latch can occur according to the comparison result signal and clock that comparator exports
The clock signal of device output exports two control signals, to control two switching devices on main side.
In a kind of possible design, described two switching devices are first switch tube, second switch；
The first switch tube is NMOS tube, and the second switch is PMOS tube.
In a kind of possible design, described control unit is used for according to the first control expression formula to the main side capacitor
Voltage is controlled；
Described first, which controls expression formula, includes:
VC1=VREF1* (RS1+RS2)/RS2；
Described control unit is also used to control the output voltage of the second siding ring according to the second control expression formula
System；
Described second, which controls expression formula, includes:
VO1=n*VC1；
Wherein, the VC1 indicates that the voltage of the main side capacitor, the VO1 indicate the output electricity of the second siding ring
Pressure, the n indicate the turn ratio between the second siding ring and the first siding ring, and the VREF1 indicates the amplification
One reference voltage of circuit access, described RS1, RS2 respectively indicate two sampling resistors in the sample circuit.
In a kind of possible design, described two clamp diodes are first diode, the second diode；
The Same Name of Ends of the first siding ring is connect with the cathode of the first diode, the anode of the first diode
It is connect with main side；
The different name end of the first siding ring is connect with the anode of second diode, the cathode of second diode
By it is described it is main while capacitor with it is main while connect.
By above-mentioned implementation, the possible converter structure of one of converter control circuit is provided.
In a kind of possible design, described two clamp diodes are first diode, the second diode；
The Same Name of Ends of the first siding ring is connect with the cathode of the first diode, the anode of the first diode
By it is described it is main while capacitor with it is main while connect；
The different name end of the first siding ring is connect with the anode of second diode, the cathode of second diode
For accessing power supply.
By above-mentioned implementation, the alternatively possible converter structure in converter control circuit is provided.
Second aspect, the embodiment of the present application provide a kind of chip, control including converter described in aforementioned first aspect
Circuit.
It, can be in the form of chip package to all or part of device in converter control circuit by above-mentioned implementation
It is packaged, reduces the volume of entire converter control circuit.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application will make below to required in the embodiment of the present application
Attached drawing is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore should not be seen
Work is the restriction to range, for those of ordinary skill in the art, without creative efforts, can be with
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of schematic diagram of flyback converter control circuit in the prior art.
Fig. 2 is a kind of schematic diagram of converter control circuit provided by the embodiments of the present application.
Fig. 3 be converter control circuit provided by the embodiments of the present application in main side capacitor both ends voltage and output voltage it
Between relation curve schematic diagram.
Fig. 4 is the schematic diagram of the converter control circuit in an example provided by the embodiments of the present application.
Fig. 5 is the schematic diagram of the converter control circuit in another example provided by the embodiments of the present application.
Fig. 6 is the schematic diagram of another converter control circuit provided by the embodiments of the present application.
Fig. 7 is the schematic diagram of the converter control circuit in another example provided by the embodiments of the present application.
Icon: Q1- first switch tube；Q2- second switch；D1- first diode；The second diode of D2-；X1- target
Transformer；L11- first siding ring；L22- second siding ring；The main side capacitor of C1-；D3- third diode；The main side GND1-；
GND2- pair side；Y- control unit；100- sample circuit；RS1- first resistor；RS2- second resistance；200- amplifying circuit；
300- oscillating circuit；DR1- first switch driver；DR2- second switch driver.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application is described.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile the application's
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
It is a kind of flyback converter control circuit in the prior art referring to Fig. 1, shown in FIG. 1, actually one
The structure that kind controls biswitch flyback converter.
As shown in Figure 1, the biswitch flyback converter in Fig. 1 includes transformer X1, two switching device Q1 and Q2, one
To clamp diode D1 and D2 and third diode D3.The first siding ring L11 and second siding ring L22 of transformer X1 it
Between turn ratio be 1:n.
The both ends first siding ring L11 are connect with two switching devices Q1, Q2 respectively, a switch in two switching devices
Device connects power supply, another switching device with connecing main side GND1.And the both ends first siding ring L11 are also connected with a pair of of clamp diode
D1,D2.GND2, the other end connect third diode D3, the D3 connection of third diode to the one of second siding ring L22 with terminating secondary side
Load.
The control principle of structure shown in Fig. 1 is: the secondary side signal of transformer X1 is directly acquired using secondary edge emitting unit
(or secondary side signal, secondary signal) obtains transformer X1 by devices such as photoelectrical coupler, auxiliary transformer, auxiliary capacitors
Secondary side signal, and feed back to the main side receiving unit of transformer X1 primary side, PWM (Pulse Width Modulation,
Pulse width modulation) controller, it is controlled by switching device of the PWM controller to primary side (or main side, primary).Its
In, " PWM " in Fig. 1 indicates the device being modulated with pulse width modulation.
Inventor is the study found that structure shown in FIG. 1 needs separately set photoelectrical coupler outside flyback converter, auxiliary becomes
The isolating devices such as depressor, auxiliary capacitor, structure is complex, therefore proposes following embodiment to provide one to flyback converter
Kind new control mode and corresponding control structure.
First embodiment
The embodiment of the present application provides a kind of converter control circuit, can be used for controlling flyback converter, such as
It can be used for controlling biswitch flyback converter, for ease of description, below that the biswitch in the embodiment of the present application is anti-
Swash formula converter and is referred to as converter.
Fig. 2 is please referred to, Fig. 2 is a kind of schematic diagram of converter control circuit provided by the embodiments of the present application.Such as Fig. 2 institute
Show, the converter control circuit include: target transformer X1, two clamp diodes, two switching devices, main side capacitor C1,
Third diode D3, control unit Y.Two clamp diodes can be expressed as " D1 ", " D2 " in Fig. 2.Two switching devices
" Q1 ", " Q2 " that can be expressed as in Fig. 2.
Target transformer X1 includes first siding ring L11, second siding ring L22.First siding ring L11 and second siding ring
Turn ratio between L22 is 1:n.
The both ends of first siding ring L11 are connect with two switching devices respectively, the both ends of first siding ring L11 also respectively with
Two clamp diode connections.
One of switching device in two switching devices is another in two switching devices for connecting to power supply
A switching device is for connecing main side GND1.
One of diode in two clamp diodes is by the main ground GND1 when capacitor C1 connection is main.This two pincers
Another diode in the diode of position GND1 or connects power supply with connecing main side.
With secondary side GND2 is connect for one end of second siding ring L22, the other end and third diode of second siding ring L22
D3 connection.
The input terminal of control unit Y is connect with main side capacitor C1, and two output ends of control unit Y are switched with two respectively
Device connection.
Wherein, control unit Y is used to adjust the turn-on time of two switching devices according to the voltage VC1 of main side capacitor C1,
To adjust the output voltage of second siding ring L22.
Under the action of control unit Y, two switching devices can periodic on, off simultaneously.
By above structure, control unit Y can according to it is main while it is main while capacitor C1 voltage VC1 switching device is carried out
Control, can realize the control to switching device according to the signal on main side, to adjust duty ratio D, the output electricity of regulating winding
Press VO1.Above structure obtains secondary side signal without isolating devices such as optocoupler, auxiliary windings.Relative to existing conversion
The structure of device control mode, above-mentioned converter control circuit is more simplified.
Optionally, the capacitance of main side capacitor C1 is larger, such as can be greater than 100pF.Due to the capacitor of main side capacitor C1
It is worth larger, therefore the fluctuation of the voltage VC1 at the main both ends side capacitor C1 in the steady state is smaller.
The voltage VC1 of main side capacitor C1 may also be referred to as first voltage, and the expression formula of first voltage can be with are as follows:
D indicates duty ratio, and VDD1 indicates supply voltage.
Wherein, in converter control circuit provided by the embodiments of the present application, by traditional biswitch flyback converter
A diode link position be changed, so that this is changed the diode of link position and connect main side capacitor C1.Primary side
The voltage VP at the both ends coil L11 could possibly be higher than supply voltage VDD1, and the range of the voltage conversion ratio of converter can be improved, so that
Voltage conversion ratio is no longer limited by the turn ratio n between the first siding ring L11 of transformer and second siding ring L22.
The expression formula of the voltage conversion ratio of above-mentioned converter control circuit is as follows:
When duty ratio D increases, output voltage VO 1 increases, and when duty ratio D reduces, output voltage VO 1 reduces.When accounting for
When sky ratio D is greater than 0.5, voltage conversion ratio can be greater than the turn ratio n between second siding ring L22 and first siding ring L11.
Pass throughWithThe two expression formulas, available VC1 and output voltage
Relational expression between VO1:
Relational expression between above-mentioned VC1 and output voltage VO 1 can also show as relation curve shown in Fig. 3.VC1,VO1
It maintains in the steady stateRelationship, when one of voltage change, another can change therewith, actual motion
In the process, it may be possible to which VC1 first changes, it is also possible to be that VO1 first changes.
Under practical application scene, the biswitch flyback converter given for one, second siding ring L22 and primary
Turn ratio n between lateral coil L11 is usually fixed value.Therefore it can be controlled using converter provided by the embodiments of the present application
Circuit, the voltage VC1 by adjusting the main both ends side capacitor C1 are realized so that output voltage VO 1 is adjusted to preset value with main side
Converter is adjusted in the mode of control, no longer needs to through devices such as photoelectrical coupler, auxiliary transformer, auxiliary signal capacitors
Secondary side signal is acquired, auxiliary winding is set without on main side.
Optionally, target transformer X1 can be isolating transformer, and isolation voltage can be greater than 1000 volts, can be fitted with this
Scene for electromagnetic environment complexity.
Optionally, as shown in figure 4, control unit Y may include sample circuit 100, amplifying circuit 200, oscillating circuit
300.Sample circuit 100, amplifying circuit 200, oscillating circuit 300 are sequentially connected.
The input terminal of sample circuit 100 is connect with main side capacitor C1, the output end and amplifying circuit 200 of sample circuit 100
An input terminal connection.Another input terminal of amplifying circuit 200 for access a reference voltage, amplifying circuit 200 it is defeated
Outlet is connect with the input terminal of oscillating circuit 300.Two output ends of oscillating circuit 300 are connect with two switching devices respectively.
Sample circuit 100 is used to obtain sampled signal VC1S according to the first voltage VC1 of main side capacitor C1, and sampling is believed
Number VC1S is transmitted to amplifying circuit 200.
As an implementation, sample circuit 100 may include multiple derided capacitors and/or multiple divider resistances.
The turn-on time for two switching devices of Signal Regulation that oscillating circuit 300 is used to be exported according to amplifying circuit 200, with
Adjust duty ratio D.
Wherein, amplifying circuit 200 can have one or more levels.
Reference voltage may include multiple reference voltages.In the specific implementation, any one in multiple reference voltages or
The multiple voltage signals of person can access amplifying circuit 200, such as multiple reference power sources can be accessed amplification electricity by selector
Road 200.The specific implementation of amplifying circuit 200 should not be construed as the limitation to the embodiment of the present application.
During above-mentioned realization, sample circuit 100, amplifying circuit 200, oscillating circuit 300 cooperate, can basis
The turn-on time of the first voltage VC1 regulating switch device of main side capacitor C1 realizes the adjusting of duty ratio D.When duty ratio D changes
When, the first voltage VC1 of main side capacitor C1, output voltage VO 1 are adjusted.
As an implementation, the input terminal of amplifying circuit 200 may include positive input terminal, negative input end, positive input
End can access reference voltage, and negative input end can be connect with sample circuit 100.
In an example, as shown in figure 5, sample circuit 100 includes first resistor RS1, second resistance RS2.First electricity
It is in parallel with main side capacitor C1 to hinder RS1 and second resistance RS2 series circuit in series, second resistance RS2 and first resistor RS1
The node of connection is connect with amplifying circuit 200.The voltage at node that second resistance RS2 is connected with first resistor RS1 can be used as
Sampled voltage VC1S.
Wherein, first resistor RS1, second resistance RS2 can be used as sampling resistor (or divider resistance), according to the first electricity
Hinder the first voltage VC1 of the available main side capacitor C1 of partial pressure situation of RS1, second resistance RS2.
The sampled voltage VC1S that sample circuit 100 exports can access an amplifier, and the amplifier is for accessing a benchmark
Voltage VREF1.
Optionally, oscillating circuit 300 may include comparator, ramp signal generator, latch, can also include switch
Driver.
The first input end of comparator can be connect with amplifying circuit 200, and the second input terminal of comparator can be with slope
Signal generator connection.Ramp signal generator may include integrating circuit, and the exportable waveform of ramp signal generator is ramped shaped
Signal.
The output end of comparator is connect with latch, and latch is connect with two switching devices, latch and each switch
The switch driver for driving switch device is equipped between device.
Wherein, each switching device can be configured as is driven with corresponding switch driver.Switch driver
The ability for driving switch pipe can be provided, switch driver will not impact signal frequency, duty ratio.
In other embodiments, the switch driver in oscillating circuit 300 can be separately provided, for example, oscillating circuit 300
It can be connect by two switch drivers with two switching devices.
By above structure, comparator can be exported the signal Va and ramp signal generator that amplifying circuit 200 exports
Ramp signal RAMP compare, and export comparison result signal VCMP.The comparison that latch can be exported according to comparator
Consequential signal VCMP exports two control signals VG1, VG2.Two controls signal VG1, VG2 are respectively used to adjust two of main side
The turn-on time of switching device.
As a kind of implementation, latch can be S/R latch.
In an example, if latch is S/R latch, the end R of S/R latch can connect with the output end of comparator
It connects.The end S of S/R latch is connect with a clock generator.The clock signal of clock generator output can be a frequency and fix
Pulse signal CLK.Two output ends of S/R latch are connect with two switching devices respectively, two output ends of S/R latch
The switch driver for driving switch device is equipped between two switching devices.
In an example, the end Q of S/R latch is used for by two switching devices of first switch driver DR1 connection
First switch tube Q1, the end NQ of S/R latch is used for by the in two switching devices of second switch driver DR2 connection
Two switching tube Q2.
By above-mentioned implementation, comparison result signal VCMP and clock that S/R latch can be exported according to comparator
The clock signal clk of generator output, exports two switch control signals VG1, VG2, with this two switching device to main side
It is controlled, so that the voltage VC1 of main side capacitor C1, output voltage VO 1 are adjusted.
Optionally, first switch tube Q1, second switch Q2 can be metal-oxide-semiconductor (Metal-Oxide-
Semiconductor, Metal-oxide-semicondutor, abbreviation MOS).
For example, first switch tube Q1 can be NMOS tube (NMetalOxideSemiconductor, N-type metal-oxide
Object-semiconductor, abbreviation NMOS), second switch Q2 can be PMOS tube (P Metal Oxide Semiconductor, p-type
Metal-oxide-semicondutor, abbreviation PMOS).
When first switch tube Q1 is NMOS tube and second switch Q2 is PMOS tube, the source electrode of first switch tube Q1 is used for
For accessing switch control signal, the drain electrode of first switch tube Q1 is used for the grid of with connecting main side GND1, first switch tube Q1
Connect first siding ring L11.The source electrode of second switch Q2 is opened for connecting power supply, the grid of second switch Q2 for accessing
Control signal is closed, the drain electrode of second switch Q2 is for connecting first siding ring L11.
Optionally, control unit Y is used to control the voltage of main side capacitor C1 according to the first control expression formula.
First, which controls expression formula, includes:
VC1=VREF1* (RS1+RS2)/RS2.
Control unit Y is also used to control the output voltage of second siding ring L22 according to the second control expression formula.
Second, which controls expression formula, includes:
VO1=n*VC1.
Wherein, VC1 indicates that the voltage of main side capacitor C1, VO1 indicate the output voltage of second siding ring L22.N indicates secondary
Turn ratio between lateral coil L22 and first siding ring L11.VREF1 indicates the reference voltage that amplifying circuit 200 accesses.
RS1, RS2 respectively indicate two sampling resistors in sample circuit 100.
In the present embodiment, two clamp diodes are first diode D1, the second diode D2.
The cathode of first diode D1 is used to connect the Same Name of Ends of first siding ring L11, and the anode of first diode D1 is used
The GND1 connection of the side Yu Yuzhu ground.The anode of second diode D2 is used to connect the different name end of first siding ring L11, the second diode
The cathode of D2 by it is main while capacitor C1 with it is main while GND1 connect.
By above structure, the Same Name of Ends of first siding ring L11 is connect with the cathode of first diode D1, first diode
With main side GND1 is connect the anode of D1.The different name end of first siding ring L11 is connect with the anode of the second diode D2, and the two or two
The cathode of pole pipe D2 by it is main while capacitor C1 with it is main while GND1 connect.The Same Name of Ends of first siding ring L11 is through first diode
GND1, different name end the second diode D2 of first siding ring L11 meet main side capacitor C1, first siding ring L11 to D1 with connecing main side
The voltage at both ends can be the voltage at the main both ends side capacitor C1.When third diode D3 is connected, with the electricity at the main both ends side capacitor C1
The main side as transformer is pressed to input, higher voltage output can be obtained in the secondary side of transformer, and the voltage with wider range turns
Change ratio.
The working principle of converter control circuit provided by the embodiments of the present application will be introduced below.With Fig. 4, Fig. 5
Shown in for converter control circuit.
The time span of one duty cycle of converter is T, including two stages.
First stage is the S1 stage, and the duty ratio of switch device conductive is D, time span D*T.In the S1 stage, first
Switching tube Q1, second switch Q2 conducting, first diode D1, the second diode D2 are not turned on, and electric current is from power supply through second
Electric current on switching tube Q2, first siding ring L11, first switch tube Q1 with flowing to main side GND1, first siding ring L11 increases.
In the S1 stage, the voltage at the both ends third diode D3 is negative voltage, and third diode D3 is not turned on, this stage do not have energy from
The main of target transformer X1 transmits while to secondary.
Second stage is the S2 stage, and the duty ratio of switch device conductive is (1-D), and time span is (1-D) * T.In S2 rank
Section, first switch tube Q1, second switch Q2 shutdown, first diode D1, the second diode D2 conducting, first siding ring L11
Same Name of Ends by the main side of first diode D1 connection GND1, first siding ring L11 different name end the second diode D2 meet master
Side capacitor C1.In the S2 stage, third diode D3 conducting, energy transmits while to secondary from the main of target transformer X1.
The voltage VC1 of 100 couples of sample circuit main side capacitor C1 is sampled, and obtained sampled signal VC1S may be basis
VC1 is carried out the signal that scaling obtains by specified multiple A.Ratio in specified multiple A and sample circuit 100 between each sampling resistor
It is worth related.
Amplifying circuit 200 is used for the size of benchmark signal VREF1 and sampled signal VC1S, and for according to VREF1
Difference between VC1S exports difference signal Va to oscillating circuit 300.Oscillating circuit 300 can export the side of fixed frequency
Wave, the difference signal Va that the duty ratio of square wave can be exported by amplifying circuit 200 are controlled.
It is preset voltage for reference signal VREF1.When VC1 is lower than VREF1, what oscillating circuit 300 exported
The duty ratio D of signal reduces, so that VC1, VO1 reduce.Under the collective effect of amplifying circuit 200 and oscillating circuit 300, only
Want control unit Y that there is enough gains, so that it may which VC1 is adjusted to specified size.The specified size may be with practical application
The specific amplifier of the series of amplifier, amplifying circuit 200 in the specific design of scene downsampling circuit 100, amplifying circuit 200
It designs related, it is also possible to related with the specific size of reference signal VREF1.
In an example, VC1 may be adjusted to and be approximately equal toA can be specified multiple above-mentioned.Due to defeated
Voltage VO1 can show as n times of VC1 out, be approximately equal to so VO1 may be adjusted toIt is realized and is passed through with this
The main mode in control to it is secondary while the effect that is adjusted of output voltage, without setting isolating device separately output voltage will be contained
The signal of information passes main side back, has saved cost, simplifies structure.
Working principle is described further by taking Fig. 5 as an example below.First switch tube Q1 is NMOS tube, second switch Q2
It is PMOS tube.Amplifier in amplifying circuit 200 is error amplifier.Error amplifier is by sampled signal VC1S and reference signal
Voltage difference amplification between VREF1.The output end of the negative input end connection error amplifier of comparator, to receive error amplifier
The positive input terminal of the difference signal Va of output, comparator access ramp signal RAMP.The R of S/R latch (also known as RS latch) is defeated
Enter end connection comparator, to receive comparison result signal VCMP, the S input terminal of S/R latch receives clock signal, Q output,
NQ output end passes through two switch drivers respectively and connects two switching devices.
When converter is in stable state, VC1, which can be adjusted to, is approximately equal to VC1=VREF1* (RS1+RS2)/RS2, and VO1 can
It is adjusted to and is approximately equal to VO1=n*VC1.That is, VO1=n*VREF1* (RS1+RS2)/RS2.
When causing output voltage VO 1 to reduce due to external cause (such as load current increases suddenly), VC1 can also subtract
Small, by the amplification of amplifying circuit 200, difference signal Va increases, and Va is greater than ramp signal RAMP's in one cycle
Time is elongated, and the signal dutyfactor for the comparison result signal VCMP for causing comparator to export reduces.Clock signal clk is sent out in clock
The Q output of latch can be set to high potential when starting by each signal period of raw device, and the NQ output end of latch is set to
Low potential.When VCMP becomes high voltage from low-voltage, Q output will be set to low potential, and NQ output end will be set to high electricity
Position.Therefore, when the signal dutyfactor of VCMP reduces, the duty ratio D that first switch tube Q1, second switch Q2 can be made to be connected increases
Greatly.Duty ratio D positive due to the main output voltage VO 1 in voltage VC1, the pair at the both ends capacitor C1 all with two switching devices
It closes, meeting is so that VC1, VO1 increase (when duty ratio D increases) when the signal dutyfactor of VCMP reduces, tune of the realization to VC1, VO1
Section.During VC1, VO1 increase, the voltage difference between VC1 and VREF1* (RS1+RS2)/RS2 reduces, difference signal Va
Also reduce, so that VO1 more levels off to this certain value of n*VREF1* (RS1+RS2)/RS2, so that VC1, VO1 tend towards stability.
And if due to external cause (such as load current reduces suddenly) cause secondary side output voltage VO 1 increase when,
VC1 will increase, and by the amplification of amplifying circuit 200, difference signal Va reduces, and Va is greater than ramp signal in one cycle
The time of RAMP shortens, and the signal dutyfactor of VCMP is caused to increase.When the signal dutyfactor of VCMP increases, first switch tube can be made
The duty ratio D of Q1, second switch Q2 conducting reduces so that reduce with duty ratio D positively related VC1, VO1, realize to VC1,
The adjusting of VO1.During VC1, VO1 reduce, the voltage difference between VC1 and VREF1* (RS1+RS2)/RS2 reduces, difference
Signal Va increases, and VO1 more levels off to this certain value of n*VREF1* (RS1+RS2)/RS2, so that VC1, VO1 tend towards stability.
Therefore, in the actual moving process of converter, no matter how the output voltage VO 1 on secondary side fluctuates (fluctuation upwards
Or fluctuation downwards), control unit Y can control two switching devices according to the voltage VC1 of main side capacitor C1, so that
Output voltage VO 1 fluctuates round about, and output voltage VO 1 is finally made to tend towards stability.Without separately setting other windings, photoelectricity
Control process can be realized in the isolating devices such as coupler.
Second embodiment
The present embodiment provides a kind of converter control circuit, converter control circuit provided in this embodiment and first is implemented
The converter control circuit that example provides is similar, and difference is, the connection type of two clamp diodes is different.
In the present embodiment, as shown in fig. 6, converter control circuit includes: target transformer X1, two switching devices, two
A clamp diode, main side capacitor C1, third diode D3, control unit Y.
Target transformer X1 includes first siding ring L11, second siding ring L22, first siding ring L11, second siding ring
Turn ratio between L22 is 1:n.
Two clamp diodes are first diode D1, the second diode D2.
The cathode of first diode D1 is used to connect the Same Name of Ends of first siding ring L11, the anode warp of first diode D1
Cross it is main while capacitor C1 with it is main while GND1 connect.The anode of second diode D2 is used to connect the different name end of first siding ring L11,
The cathode of second diode D2 is for accessing power supply.
The Same Name of Ends of first siding ring L11, different name end are respectively used to connection two switching devices Q2, Q1.Control unit Y's
Input terminal is connect with main side capacitor C1, and two output ends of control unit Y are connect with two switching devices respectively.
The input terminal of control unit Y is connect with main side capacitor C1, and two output ends of control unit Y are switched with two respectively
Device connection.
As shown in fig. 7, control unit Y may include sequentially connected sample circuit 100, amplifying circuit 200, oscillating circuit
300.Wherein, sample circuit 100 is connect with main side capacitor C1, two output ends of oscillating circuit 300 respectively with two derailing switches
Part connection.
By above-mentioned implementation, the Same Name of Ends of first siding ring L11 is connect with the cathode of first diode D1, and the one or two
The anode of pole pipe D1 by it is main while capacitor C1 with it is main while GND1 connect；The different name end of first siding ring L11 and the second diode
The anode connection of D2, the cathode of the second diode D2 access power supply.Such structure can to work as first diode D1, second
When diode D2 is connected, the different name of first siding ring L11 is connected to the power supply on main side, the termination master of the same name of first siding ring L11
Side capacitor C1, voltage at the main node being connect in capacitor C1 with the second diode D2 relative to it is main while the voltage of GND1 can be with
For negative voltage, the voltage VP at the both ends first siding ring L11 can be supply voltage VDD1 and main side capacitor C1 both end voltage VC1 it
Poor (the sum of absolute value).When third diode D3 conducting, with the difference of supply voltage VDD1 and main side capacitor C1 both end voltage VC1
Main side as transformer inputs, and the secondary side of transformer can be made to obtain higher voltage output.And control unit Y can basis
The voltage VC1 of main side capacitor C1 adjusts the turn-on time of two switching devices, can be in such a way that main side controls to transformer
Output voltage is adjusted, and the signal on secondary side is obtained without additional isolating device.
About the other details of converter control circuit in the present embodiment, please further refer in aforementioned first embodiment
Associated description, details are not described herein.
It should be noted that the converter that converter control circuit provided in this embodiment and first embodiment provide controls
Circuit is similar in terms of working principle, is all the duty that two switching devices are adjusted according to the voltage VC1 of main side capacitor C1
Than D, to adjust output voltage VO 1, so that output voltage VO 1 tends towards stability.That is, with it is main while control mode realize to it is secondary while export
Signal is adjusted, without additional isolating device or additional device.
3rd embodiment
The embodiment of the present application provides a kind of chip, including converter control circuit described in aforementioned first embodiment.Its
In, all or part of device of converter control circuit may be encapsulated in the chip.Pin on chip can be used
In connection load, power supply.
In a kind of possible situation, other devices in converter control circuit other than target transformer X1 all may be used
To be integrated in same chip.
In the case where alternatively possible, if target transformer X1 is miniature transformer, for example, if transformer size not
More than 5 millimeters, target transformer X1, two switching devices, two clamp diodes, third diode D3 can be integrated in together
In one chip.
All or part of device in converter control circuit can be packaged in the form of chip package, be reduced by this
The volume of entire converter control circuit.
Fourth embodiment
The embodiment of the present application provides a kind of chip, and the chip is similar with the chip that 3rd embodiment provides, and difference is,
All or part of device of the chip in the converter control circuit described in aforementioned second embodiment is packaged.
About the other details of chip provided in this embodiment, retouched please further refer to the correlation in aforementioned several embodiments
It states, details are not described herein.
It is steady to be conducive to raising structure for volume can reduce entire converter control circuit in the form of chip package
It is qualitative.
The above description is only an example of the present application, the protection scope being not intended to limit this application, for ability
For the technical staff in domain, various changes and changes are possible in this application.Within the spirit and principles of this application, made
Any modification, equivalent substitution, improvement and etc. should be included within the scope of protection of this application.The protection scope of the application should be with
Subject to scope of protection of the claims.
Claims (10)
1. a kind of converter control circuit, which is characterized in that the converter control circuit includes:
Target transformer, two clamp diodes, two switching devices, main side capacitor, third diode, control unit；
The target transformer includes first siding ring, second siding ring；
The both ends of the first siding ring are connect with described two switching devices respectively, and the both ends of the first siding ring are also distinguished
It is connect with described two clamp diodes；
A diode in described two clamp diodes is by described main when capacitance connection is main；
One end of the second siding ring is connect with secondary side, and the other end of the second siding ring and the third diode connect
It connects；
The input terminal of described control unit and the main side capacitance connection, two output ends of described control unit respectively with it is described
Two switching device connections；
Described control unit is used to adjust the turn-on time of described two switching devices according to the voltage of the main side capacitor, to adjust
Save the output voltage of the second siding ring.
2. converter control circuit according to claim 1, which is characterized in that described control unit include sample circuit,
Amplifying circuit, oscillating circuit；
The input terminal of the sample circuit and the main side capacitance connection, the output end of the sample circuit and the amplifying circuit
An input terminal connection；
Another input terminal of the amplifying circuit is for accessing a reference voltage, the output end of the amplifying circuit and the vibration
Swing the input terminal connection of circuit；
Two output ends of the oscillating circuit are connect with described two switching devices respectively；
The sample circuit is used to obtain acquisition signal according to the voltage of the main side capacitor, and the acquisition signal is transmitted to
The amplifying circuit；
The turn-on time for the described two switching devices of Signal Regulation that the oscillating circuit is used to be exported according to the amplifying circuit.
3. converter control circuit according to claim 2, which is characterized in that the sample circuit include first resistor,
Second resistance；
The first resistor and the second resistance it is in series series circuit it is in parallel with the main side capacitor；
Wherein, the second resistance and the node of first resistor connection are connect with the amplifying circuit.
4. converter control circuit according to claim 2, which is characterized in that the oscillating circuit include comparator, tiltedly
Slope signal generator, latch, switch driver；
The first input end of the comparator is connect with the amplifying circuit, the second input terminal of the comparator and the slope
Signal generator connection；
The output end of the comparator is connect with the latch, and the latch is connect with described two switching devices, described
The switch driver for driving switch device is equipped between latch and each switching device.
5. converter control circuit according to claim 4, which is characterized in that the latch is S/R latch；
The end R of the S/R latch is connect with the output end of the comparator；
The end S of the S/R latch is connect with a clock generator；
Two output ends of the S/R latch are connect with described two switching devices respectively, two outputs of the S/R latch
The switch driver for driving switch device is equipped between end and described two switching devices.
6. converter control circuit according to claim 5, which is characterized in that
Described two switching devices are first switch tube, second switch；
The first switch tube is NMOS tube, and the second switch is PMOS tube.
7. converter control circuit according to claim 2, which is characterized in that
Described control unit is used to control the voltage of the main side capacitor according to the first control expression formula；
Described first, which controls expression formula, includes:
VC1=VREF1* (RS1+RS2)/RS2；
Described control unit is also used to control the output voltage of the second siding ring according to the second control expression formula；
Described second, which controls expression formula, includes:
VO1=n*VC1；
Wherein, the VC1 indicates that the voltage of the main side capacitor, the VO1 indicate the output voltage of the second siding ring, institute
Stating n indicates turn ratio between the second siding ring and the first siding ring, and the VREF1 indicates that the amplifying circuit connects
The reference voltage entered, described RS1, RS2 respectively indicate two sampling resistors in the sample circuit.
8. converter control circuit according to claim 1, which is characterized in that described two clamp diodes are the one or two
Pole pipe, the second diode；
The Same Name of Ends of the first siding ring is connect with the cathode of the first diode, anode and the master of the first diode
Connect to side；
The different name end of the first siding ring is connect with the anode of second diode, and the cathode of second diode passes through
It is described it is main while capacitor with it is main while connect.
9. converter control circuit according to claim 1, which is characterized in that described two clamp diodes are the one or two
Pole pipe, the second diode；
The Same Name of Ends of the first siding ring is connect with the cathode of the first diode, and the anode of the first diode passes through
It is described it is main while capacitor with it is main while connect；
The different name end of the first siding ring is connect with the anode of second diode, and the cathode of second diode is used for
Access power supply.
10. a kind of chip, which is characterized in that including the described in any item converter control circuits of claim 1-9.
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| CN201910513106.4A CN110190754A (en) | 2019-06-13 | 2019-06-13 | Converter control circuit and chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11863079B2 (en) | 2021-06-30 | 2024-01-02 | Dialog Semiconductor Inc. | Switching power converter with secondary-side control |
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