WO2007076702A1 - Convertisseur continu-continu auto-oscillant et son procede de commande - Google Patents
Convertisseur continu-continu auto-oscillant et son procede de commande Download PDFInfo
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- WO2007076702A1 WO2007076702A1 PCT/CN2006/003697 CN2006003697W WO2007076702A1 WO 2007076702 A1 WO2007076702 A1 WO 2007076702A1 CN 2006003697 W CN2006003697 W CN 2006003697W WO 2007076702 A1 WO2007076702 A1 WO 2007076702A1
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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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
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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
- H02M3/01—Resonant DC/DC converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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
- H02M3/33569—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 having several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the invention relates to a DC power conversion technology, and in particular to a control method and device for a resonant DC/DC converter.
- a series resonant DC/DC converter adopts a resonant conversion technique. Since the resonant element operates in a sinusoidal resonant state, the voltage on the switching transistor naturally crosses zero, and zero voltage turn-on can be realized. The loss is small.
- This topology usually uses the Pulse Frequency Modulation (PFM) method to stabilize the output voltage by changing the operating frequency.
- Figure 1 shows the basic form of a half-bridge SRC series resonant DC/DC converter. When PFM control is applied to the circuit, the two bypass tubes S1 and S2 are driven symmetrically and symmetrically, each conducting 50% (this is an ideal value, such as Consider the dead zone setting should be slightly less than 50% of the switching period.
- the relationship between the power supply output voltage gain M and the operating frequency f is -
- V. And V in are the output and input voltage
- f is the operating frequency
- f r f r is the resonant frequency
- L r is the resonant inductance value
- C r is
- simple frequency conversion control will lead to wide or even failure of the operating frequency range, which is difficult to optimize the magnetic components and excessive circuit loss, and the problem that the feedback control is difficult to design. Therefore, the simple FM control cannot meet the light load or no load. The output voltage is required.
- the half bridge digital resonant circuit is taken as an example to illustrate the shortcomings of the FM control mode. Similarly, the phenomenon of the full bridge series resonant circuit is exactly the same as the half bridge series resonance phenomenon. In theory, all resonant control circuits have similar problems.
- the object of the present invention is to provide a control method and device for a resonant DC/DC converter, which solves the problem that in the prior art, when the load is operated at a light load or a no load, the use of the frequency modulation control is difficult to optimize the magnetic component, and it is difficult to stabilize the voltage and the circuit. The problem of excessive loss.
- the technical solution adopted by the present invention is: A control method of a resonant DC/DC converter, which adjusts the output voltage by changing the conduction frequency of the input switching tube of the resonant circuit, and also according to the feedback of the load circuit.
- the signal adjusts the duty cycle of the switching transistor such that the voltage output range of the resonant circuit is expanded.
- the resonant circuit input switch tube can be controlled by a driving pulse through a driving circuit, and the obtaining of the driving pulse includes the following steps,
- the pulse signal whose frequency and duty ratio are adjusted together with the feedback signal is used as the driving pulse of the driving circuit, so that the resonant circuit operates in PWM (Pulse width modulation). Modulation) control and PFM control mixing mode; otherwise, the pulse signal whose duty cycle is stable and the frequency changes with the feedback signal is used as the driving pulse of the driving circuit, so that the resonant circuit operates in the PFM control mode.
- PWM Pulse width modulation
- Modulation Pulse width modulation
- PFM control mixing mode otherwise, the pulse signal whose duty cycle is stable and the frequency changes with the feedback signal is used as the driving pulse of the driving circuit, so that the resonant circuit operates in the PFM control mode.
- the step 1) may include the following steps: La) sampling the feedback voltage from the load circuit;
- the selection of the PFM control and the PFM+PWM control in the above control method is preferably implemented by the following process: in the step 2), the feedback signal is respectively subjected to an arithmetic processing to obtain a frequency conversion control signal and a pulse width modulation signal; the pulse width modulation signal
- the operation processing process includes the steps of comparing with the reference signal to determine whether the load operates in a light load or no load state, the reference signal is determined according to the electrical characteristics of the load; and the load is operated in the step 3) In the light load or no-load state, a drive pulse that is commonly adjusted by the variable frequency control signal and the pulse width modulation signal is generated; otherwise, a drive pulse whose duty cycle is stable and which is separately adjusted by the variable frequency control signal is generated.
- the operation processing process of the frequency conversion control signal in the step 2) includes comparing with the reference signal two to determine whether the load operates in an approximately no-load state, The reference signal 2 is determined according to the electrical characteristics of the load, and the reference signal 2 is satisfied. If the load works according to the judgment of the reference signal 2 in an approximate no-load state, the reference signal 1 must work according to the judgment of the reference signal 1 to work at light load or empty.
- the step 3 when the load operates in an approximately no-load state, a drive pulse whose frequency is stable and is separately adjusted by the pulse width modulation signal is generated.
- a resonant DC/DC converter is also provided, including
- the driving circuit controls an input switch of the resonant circuit according to the input driving pulse, and the resonant circuit supplies the converted power to the load circuit under the control of the driving circuit, and
- the negative feedback compensation regulator obtains a feedback signal by performing a negative feedback compensation operation on the feedback voltage sampled in the load circuit
- a discriminator judging a load state of the load circuit according to the input feedback signal, and outputting a drive pulse modulation signal
- Driving the pulse generator to modulate and output the driving pulse according to the input driving pulse modulation signal If the load operates in a light load or no load state, the frequency and duty ratio of the output driving pulse are adjusted together with the feedback signal; otherwise, the output The duty cycle of the drive pulse is stable and the frequency varies with the feedback signal.
- the dynamic pulse generator comprises a frequency conversion control circuit and a frequency conversion control + pulse width modulation circuit; if the discriminator judges that the load works in a light load or no load state, the drive pulse modulation signal is output to the frequency conversion control + pulse width modulation circuit, and the control is controlled The output pulse and the duty ratio are adjusted together with the feedback signal to change the drive pulse; otherwise, the drive pulse modulation signal is output to the variable frequency control circuit to control the drive pulse whose output duty ratio is stable and the frequency changes with the change of the feedback signal.
- a preferred scheme for performing PFM control and PFM+PWM control of the above resonant DC/DC converter can use only one driving signal generating circuit module: the discriminator includes arithmetic circuits one and two, and the arithmetic circuit is set There is a reference signal, the driving pulse modulation signal comprises a frequency conversion control signal and a pulse width modulation signal; the feedback signal is calculated by the operation circuit, and compared with the reference signal, the output is a pulse width modulation signal; the feedback signal The operation circuit 2 outputs an inverter control signal; the reference signal is determined according to the electrical characteristics of the load, so that when the load operates in a light load or no load state, the output pulse width modulation signal changes with the feedback signal.
- the driving pulse generator includes a frequency conversion control circuit and a pulse width modulation circuit
- the frequency conversion control circuit generates a frequency conversion pulse whose frequency is controlled by a frequency conversion control signal
- the pulse width modulation circuit is modulated according to pulse width
- the signal pulse-width modulates the variable frequency pulse and outputs a drive pulse.
- the pulse width modulation circuit may be configured to compare the pulse width modulation signal with the variable frequency pulse and output the driving pulse.
- variable frequency pulse may be input to the synchronizing terminal of the pulse width modulation circuit, and the pulse width modulation circuit may pulse-width modulate the input variable frequency pulse according to the pulse width modulation signal to output a driving pulse.
- the operation circuit 2 is configured with a reference signal 2; the feedback signal is calculated by the operation circuit 2, compared with the reference signal 2, and the output is converted into a frequency conversion.
- a control signal; the reference signal 2 is determined according to an electrical characteristic of the load, such that when the load operates in an approximately no-load state, the output variable frequency control signal remains stable; otherwise, changes with the feedback signal; and the reference signal Second, if the load works according to the judgment of the reference signal 2 in the approximate no-load state, it will work in the light load or no-load state according to the judgment of the reference signal one;
- the frequency conversion control circuit may adopt a structure including a voltage-frequency oscillator and a triangular wave generator which are sequentially connected; the frequency conversion control signal is input to a voltage-frequency oscillator to control an oscillation frequency thereof, and the triangular wave generator outputs a frequency-controlled frequency conversion pulse.
- the PWM control mode is introduced to realize the two control modes of PFM and PFM + PWM.
- the PFM control is used.
- the power supply frequency is too high, the PFM is introduced. +PWM control mode. It is also possible to fix the frequency at a higher frequency and enter the PWM control mode, thereby solving the difficult problem of the resonant converter, that is, the problem that the operating frequency is too high and the circuit loss is too large at light load and no load, and the resonant circuit is greatly increased.
- the output voltage regulation capability effectively extends the voltage output range.
- PFM control and PFM + PWM control are logically optional parallel relationships, but can be implemented by using a preferred inverter control circuit and pulse width modulation circuit in series.
- the circuit avoids many logic gating.
- the device and the multi-channel negative feedback compensation regulator are used in a simple circuit, and the two control modes are switched smoothly, and the reliability and dynamic characteristics are very good.
- the invention is applicable to the deformation topology of the full bridge series, the parallel resonant circuit, the half bridge string, the parallel resonant circuit and the resonant circuit such as LLC, and has strong engineering significance.
- FIG. 1 is a schematic diagram of a typical half bridge series resonant circuit in the prior art.
- Figure 2 is a graph showing the output characteristics of the circuit in the PFM control mode of Figure 1.
- Fig. 3 is a comparison diagram of the output characteristic curve of the circuit of Fig. 1 after the control method of the present invention is employed.
- Figure 4 is a block diagram showing the principle of a DC/DC converter of the present invention.
- FIG. 5 is a detailed block diagram of the circuit in the dashed box of Figure 4.
- Fig. 6 is a schematic diagram showing the relationship between the feedback signal of the DC/DC converter and the frequency and duty ratio in Fig. 4.
- Figure 7 is a waveform diagram of the drive pulse.
- Fig. 8 is a block diagram showing another principle of the DC/DC converter of the present invention. ⁇ detailed description ⁇
- a control method of a resonant DC/DC converter is to adjust an output voltage by changing a conduction frequency of a switching circuit of a resonant circuit thereof, and is also adjusted according to a feedback signal of a load circuit
- the duty cycle of the switching transistor extends the voltage output range of the resonant circuit.
- the curves A1 to A3 in FIG. 3 are characteristic curves of the output voltage Vo and the frequency f with a duty ratio of 50% using a separate PFM control mode under different load conditions. It can be seen that as the load is reduced, Vo tends to be flat and difficult to stabilize by increasing the operating frequency.
- the curves B1, B2, and B3 in Fig. 3 are characteristic curves of the output voltage Vo and the duty ratio D and the frequency f in the integrated mode after the switching frequency of the curves A1 to A3 is raised to fa in the PFM control mode. Schematic; Control of duty cycle D starts from 50% until it reaches zero.
- the control of the input and output of the resonant circuit is performed by the driving pulse through the driving circuit. Therefore, the switching from PFM to PFM+PWM is realized by the change of the driving pulse. Since the switching of the control mode is directly related to the load, the driving pulse is The following methods are used to obtain -
- the judging process is performed by calculating the feedback signal and comparing with the reference signal: the feedback signal is respectively processed to obtain the variable frequency control signal and the pulse width modulation signal.
- the operation process of the pulse width modulation signal is to compare the feedback signal by a proportional or addition and subtraction operation, and compare it with the set reference signal. If it is lower than the reference signal (or higher than the reference signal, it is determined according to the logic characteristic of the circuit, It is assumed here that the feedback signal is proportional to the load voltage, and the lower the feedback signal, the lighter the load, the direct output of the calculated feedback signal as a pulse width modulated signal.
- the stable reference signal 1 is output as the pulse width modulation signal, and since the pulse width modulation signal does not change at this time, it corresponds to the case of pure PFM control.
- the reference signal one needs to be determined according to the electrical characteristics of the load, so that the comparison based on the reference signal one judges whether the substantially correct response load operates in a light load state.
- the operation process of the variable frequency control signal can be carried out in two ways.
- One is to directly convert the feedback signal into a frequency conversion control signal after proportional or addition and subtraction, so that the variable frequency control signal always changes with the change of the feedback signal, so the resonant circuit Always have PFM control mode.
- the other is to follow the operation mode of the pulse width modulation signal described above, and compare the result with the set reference signal two after the operation of proportional or addition and subtraction, if it is higher than the reference signal two (or lower than the reference signal, according to the circuit
- the logic characteristics are determined. It is assumed that the feedback signal is proportional to the load voltage, and the lower the feedback signal, the lighter the load.
- the feedback signal after the operation is directly output as the variable frequency control signal.
- the stable reference signal 2 is output as the frequency conversion control signal, and since the frequency conversion control signal does not change at this time, it corresponds to the case of pure PWM control.
- the reference signal 2 also needs to be determined based on the electrical characteristics of the load such that the comparison based on the reference signal two determines whether the substantially correct reaction load is operating in an approximately no-load state.
- the load operates in an approximate no-load state according to the judgment of the reference signal 2
- it is determined to work in a light load state according to the judgment of the reference signal one, which also It is ensured that in any case, at least one of the pulse width modulation signal and the variable frequency control signal changes with the change of the feedback signal.
- step 2) if the load works in the non-light load state, the pulse width modulation signal is stabilized as the reference signal one, and the frequency conversion control signal changes with the change of the feedback signal, so under the control of the two signals
- the output is a driving pulse whose duty cycle is stable and the frequency changes with the feedback signal.
- the resonant circuit operates in the PFM control mode; if the load operates in a light load state, both the pulse width modulation signal and the variable frequency control signal change with the feedback signal.
- the resonant circuit works in PFM+PWM control mode; if the load works at approximately no load State, the pulse width modulation signal changes with the change of the feedback signal, and the frequency conversion control signal is stabilized as the reference signal two, so under the control of the two signals, the output is a driving pulse whose frequency is stable and the duty ratio changes with the feedback signal.
- the resonant circuit operates in the PWM control mode; the following describes in detail a method using the above control method.
- Resonant DC/DC converter combined with Figure 4 and Figure 5, including
- the driving circuit controls an input switch of the resonant circuit according to the input driving pulse, and the resonant circuit supplies the converted power to the load circuit under the control of the driving circuit, and
- Negative feedback compensation regulator acted upon by the PI regulator, will be sampled from the load circuit
- the feedback voltage is obtained after the feed voltage and the set voltage are set to perform a negative feedback compensation operation
- the discriminator includes the arithmetic circuits one and two, and the arithmetic circuits one and two are respectively set with reference signals one and two
- the feedback signal is passed through the operation circuit After performing an operation and comparing with the reference signal, the output is a pulse width modulation signal
- the feedback signal is calculated by the operation circuit 2, and compared with the reference signal 2, and then output as an inverter control signal
- the reference signals 1 and 2 are based on the electrical characteristics of the load.
- the discriminator When the load works in an approximate no-load state, the discriminator outputs a stable variable frequency control signal (ie, reference signal 2) and a pulse width modulation signal that varies with the feedback signal; when the load operates in a light load state, the discriminator output is The pulse width modulation signal and the frequency conversion control signal that change with the feedback signal change; in addition, the discriminator outputs a variable frequency control signal that changes with the feedback signal and a stable pulse width modulation signal (ie, reference signal one).
- a stable variable frequency control signal ie, reference signal 2
- a pulse width modulation signal that varies with the feedback signal
- the discriminator output when the load operates in a light load state, the discriminator output is The pulse width modulation signal and the frequency conversion control signal that change with the feedback signal change; in addition, the discriminator outputs a variable frequency control signal that changes with the feedback signal and a stable pulse width modulation signal (ie, reference signal one).
- the drive pulse generator includes a frequency conversion control circuit and a pulse width modulation circuit.
- the frequency conversion control circuit includes a voltage frequency oscillator and a triangular wave generator which are sequentially connected; the pulse width modulation circuit is
- the frequency conversion control signal input voltage frequency oscillator controls the oscillation frequency thereof, and the voltage frequency oscillator changes the voltage signal of the frequency conversion control signal into a square wave signal whose output frequency changes, and the triangular wave generator receives the square wave signal of the frequency change to generate a triangular wave of frequency variation.
- the signal is output to the synchronous end of the PWM generating circuit; the PWM generating circuit pulse-width modulates the input frequency-converted triangular wave signal according to the pulse width modulation signal V ⁇ mp input from the comp terminal, and outputs a driving pulse.
- the duty cycle of the drive pulse does not change any more, only the frequency changes, that is, enters the PFM control; when V ⁇ mp and the variable frequency control signal both change the output, the duty cycle of the drive pulse
- the frequency changes at the same time, that is, enters the PFM+PWM control; when the stable output of the variable frequency control signal is the reference signal two, the frequency of the driving pulse does not change any more, and only the duty cycle changes, that is, enters the PWM control.
- the reference signal is one-half of the peak value of the triangular wave, so that the driving pulse outputted in the PFM control mode has a duty ratio of 50%.
- the separate PWM control mode can also be disabled, so that the output frequency of the drive pulse is always related to the feedback signal, which is equivalent to setting the reference signal two to zero.
- Modules capable of implementing the functions of the variable frequency control circuit and the pulse width modulation circuit are usually integrated in one chip. Depending on the internal functional architecture of the chip used, there may be more specific circuit relationships between them, such as a pulse width modulation circuit. It may be that the pulse width modulation signal is 1 ⁇ 4. ⁇ Compared with the frequency conversion triangle wave signal, the output drive pulse is synthesized. But simplified, The variable frequency control circuit and the pulse width modulation circuit can be summarized as a series circuit relationship, that is, the frequency conversion control circuit generates a pulse signal and controls its frequency, and the pulse width modulation circuit further determines the duty ratio of the pulse signal.
- the control frequency changes simultaneously with the duty cycle:
- the duty cycle changes from D0% to 50% full pulse width (without dead band), causing the output voltage to continue to rise;
- the frequency is also reduced from finax to f0. This change also causes the output voltage to rise.
- the duty cycle reaches a maximum of 50%, and the output voltage rises to V2.
- the operation mode is PFM+PWM control.
- Waveform A is the drive pulse waveform with a 50% duty cycle under PFM control.
- Waveform B is the drive pulse waveform under PFM+PWM control. The aspect ratio width and frequency are adjusted as the output voltage changes until the duty cycle is zero.
- the above resonant DC/DC converter adopts a frequency conversion control circuit and a pulse width modulation circuit structure connected in series on the circuit to realize logic parallel juxtaposition of PFM control and PFM+PWM control scheme, and actually another alternative scheme can be adopted.
- the discriminator selectively controls one of the output to meet the control pulse of the control according to the load judgment condition, that is: If the discriminator determines that the load is operating in a light load or no load state, outputting a drive pulse modulation signal to the variable frequency control + pulse width modulation circuit, and controlling a drive pulse whose output frequency and duty ratio are jointly adjusted according to a change of the feedback signal; Otherwise, the drive pulse modulation signal is output to the variable frequency control circuit to control the drive pulse whose output duty ratio is stable and the frequency changes with the change of the feedback signal.
- This alternative also achieves the object of the invention, but with a more complex
- the value of the reference signal determines the timing of switching the control mode.
- the choice of pointcut for most resonant circuits, it is determined according to the condition of the load, generally light load, no load or almost no load, because the control ability of PFM is weak in this area.
- the control method of the present invention is applicable to a circuit working using a resonance principle, including series resonance, parallel resonance, series-parallel resonance, etc., and the circuit topology may be a full bridge, a half bridge, or the like.
- the inverter When the operating frequency of the resonant circuit is low, the inverter is operated in the frequency conversion control mode; when the operating frequency is high, the converter is operated in the frequency conversion control + pulse width modulation control mode, thereby avoiding no load and light load. Under the condition, the switching frequency is too high, which is conducive to the stability of the output voltage at light load.
- the invention can be realized by a simple circuit structure. When the circuit is switched between states of different control modes, the switching is smooth, and the reliability of the circuit operation is ensured.
- the frequency conversion control + pulse width modulation, frequency conversion control and discriminating circuit of the invention can be constructed by using a hardware circuit or by programming a chip having a corresponding function module according to the control method of the present invention, and this part of the work is Those of ordinary skill in the art will readily derive from the above-described technical solutions.
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- Dc-Dc Converters (AREA)
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP06840727.9A EP1973220B1 (en) | 2005-12-30 | 2006-12-29 | A resonant dc/dc converter and its control method |
US12/087,278 US8406014B2 (en) | 2005-12-30 | 2006-12-29 | Circuit for adjusting the output voltage for a resonant DC/DC converter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN200510003362.7 | 2005-12-30 | ||
CN2005100033627A CN1992493B (zh) | 2005-12-30 | 2005-12-30 | 一种谐振直流/直流变换器及其控制方法 |
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WO2007076702A1 true WO2007076702A1 (fr) | 2007-07-12 |
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PCT/CN2006/003697 WO2007076702A1 (fr) | 2005-12-30 | 2006-12-29 | Convertisseur continu-continu auto-oscillant et son procede de commande |
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US (1) | US8406014B2 (zh) |
EP (1) | EP1973220B1 (zh) |
CN (1) | CN1992493B (zh) |
RU (1) | RU2427068C2 (zh) |
WO (1) | WO2007076702A1 (zh) |
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WO2016109811A1 (en) * | 2014-12-31 | 2016-07-07 | Texas Instruments Incorporated | Fast mode transitions in a power converter |
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CN1992493A (zh) | 2007-07-04 |
RU2008131329A (ru) | 2010-02-10 |
US8406014B2 (en) | 2013-03-26 |
CN1992493B (zh) | 2011-05-18 |
US20090218994A1 (en) | 2009-09-03 |
EP1973220A1 (en) | 2008-09-24 |
EP1973220A4 (en) | 2014-09-10 |
EP1973220B1 (en) | 2017-02-15 |
RU2427068C2 (ru) | 2011-08-20 |
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