CN113644827A - Control method of DC/DC power converter and air conditioner - Google Patents
Control method of DC/DC power converter and air conditioner Download PDFInfo
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- CN113644827A CN113644827A CN202110931420.1A CN202110931420A CN113644827A CN 113644827 A CN113644827 A CN 113644827A CN 202110931420 A CN202110931420 A CN 202110931420A CN 113644827 A CN113644827 A CN 113644827A
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- 238000009825 accumulation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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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
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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
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Abstract
The invention discloses a control method of a DC/DC power converter and an air conditioner, wherein the DC/DC power converter comprises the following components: the control method comprises the following steps of: the control circuit comprises a first control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the peak current of the full-bridge circuit and a second control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the phase shift of the PWM signal of the first bridge arm and the PWM signal of the second bridge arm in the full-bridge circuit, wherein the first control mode and the second control mode are switched according to the fact whether the duty ratio of a switching tube in the full-bridge circuit is predetermined or not. Compared with the prior art, the method simplifies the operation complexity and improves the control flexibility of the DC/DC power converter.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a control method of a DC/DC power converter and an air conditioner.
Background
A dc converter is a conversion device that converts one type of dc power into another type of dc power using power semiconductor devices. The inverter with electrical isolation between the output dc load and the input dc power source is called an isolated dc inverter. Such a converter has the following advantages: 1) the reliability and the electromagnetic compatibility of the operation of the converter are improved through electrical isolation; 2) the technical effect that the converter outputs any amplitude voltage is achieved, and the application range and occasions of the converter are widened; 3) when the transformer can operate at extremely high frequency, the volume and the weight of the transformer are greatly reduced, and noise interference is approximately eliminated. Therefore, the isolated DC converter has wide application conditions. The phase-shifted full-bridge DC/DC power converter is used as a topology of the isolated DC converter, and a reasonable control method is adopted to improve the energy conversion efficiency of a circuit system using the converter, further compress the volume and the weight of the whole circuit system, reduce the system cost and further realize the efficient comprehensive utilization of electric energy.
Currently, a phase-shifted full-bridge DC/DC power converter is often used to reduce or raise the DC bus voltage, which can provide different levels of voltage and electrical isolation in medium and high power applications such as air conditioner driving systems, and traditionally, microcontrollers for air conditioners are limited to perform supervision or communication tasks in the driving system, so that along with the increase of availability of high performance microcontroller devices, the flexibility of the system is poor and the control operation becomes very complex.
Therefore, it is an urgent technical problem in the art to design a control method for a DC/DC power converter with simple control operation and an air conditioner.
Disclosure of Invention
The invention provides a control method of a DC/DC power converter and an air conditioner, aiming at the problems of poor flexibility and complex control operation of a system caused by the improvement of the usability of microcontroller equipment in the prior art.
The technical scheme of the invention is to provide a control method of a DC/DC power converter, wherein the DC/DC power converter comprises the following steps: the control method comprises the following steps of: the control circuit comprises a first control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the peak current of the full-bridge circuit and a second control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the phase shift of the PWM signal of the first bridge arm and the PWM signal of the second bridge arm in the full-bridge circuit, wherein the first control mode and the second control mode are switched according to the fact whether the duty ratio of a switching tube in the full-bridge circuit is predetermined or not.
Further, the switching between the first control mode and the second control mode according to whether the duty ratio of the switching tube in the full-bridge circuit is predetermined comprises:
collecting an input signal of the DC/DC power converter;
judging whether a set duty ratio exists in the input signal;
if yes, determining that the duty ratio of a switching tube in the full-bridge circuit is predetermined, and enabling the DC/DC power converter to enter a first control mode;
if not, the duty ratio of a switching tube in the full-bridge circuit is judged not to be predetermined, and the DC/DC power converter enters a second control mode.
Further, the first control mode is a PCMC control mode, which includes: when the switching period of the switching tube in the primary circuit reaches half, any two switching tubes in different bridge arms in the primary circuit are driven to reset immediately, the input and output variables are cleared, after passing through a programmable dead zone window, PWM (pulse width modulation) waveform-slope compensation is carried out on the two switching tubes at the other opposite angle, and then the output of the current-doubling rectifying circuit is regulated.
Further, the second control mode is a VMC control mode, which includes: the first bridge arm and the second bridge arm are driven by complementary pulse width modulation signals with fixed duty ratio and frequency, the phase shift of a PWM signal of any branch circuit compared with the phase shift of the other driving switch is adjusted, the PWM signal overlapping time of two switching tubes at any diagonal angle in the primary circuit is further adjusted, and the output of the current-doubling rectifying circuit is changed.
Further, before entering the first control mode or the second control mode, ADC conversion is also required to be performed on the input signal, and the starting point of the ADC conversion is set in each half PWM switching period.
Further, when ADC conversion is carried out, filtering control is also included.
Further, after the DC/DC power converter enters the first control mode or the second control mode for a switching period, the PWM signal of the period is output and the sampling correction operation of the next period is performed, and the operation mode of the next period is determined according to whether the current duty ratio is predetermined.
Further, the first bridge arm comprises switching tubes Q connected in seriesAAnd a switching tube QBThe second bridge arm comprises switching tubes Q connected in seriesCAnd a switching tube QDSaid switch tube QAAnd a switching tube QBSwitched out of phase at 50% duty cycle and 180 degree phase angle, the switching tube QCAnd a switching tube QDSwitching out of phase at 50% duty cycle and 180 degrees phase angle.
Further, the full-bridge circuit and the current-doubling rectifying circuit are respectively provided with a port for grounding.
The invention also provides an air conditioner which comprises a driving system, wherein the driving system adopts the control method of the DC/DC power converter.
Further, when the working condition of the air conditioner changes, the DC/DC power converter determines whether to switch the first control mode and the second control mode in advance according to the duty ratio of a switching tube in the full-bridge circuit.
Further, when the working condition of the air conditioner is not changed, the DC/DC power converter maintains the current control mode.
Compared with the prior art, the invention has at least the following beneficial effects:
whether the duty ratio is predetermined to judge whether to enter the first control mode or the second control mode is judged, the overall control logic is simple, the flexibility of the system is good, and the operation speed is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a diagram of the topology of the DC/DC power converter of the present invention;
FIG. 2 is a block diagram of a PCMC control mode implementation of the present invention;
FIG. 3 is a block diagram of the VMC control mode of the present invention;
FIG. 4 is a schematic diagram of an output voltage regulation method during load variation;
FIG. 5 is a flow chart of a control method of the DC/DC power converter of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Currently, a phase-shifted full-bridge DC/DC power converter is often used to reduce or raise the DC bus voltage, which can provide different levels of voltage and electrical isolation in medium and high power applications such as air conditioner driving systems, and traditionally, microcontrollers for air conditioners are limited to perform supervision or communication tasks in the driving system, so that along with the increase of availability of high performance microcontroller devices, the flexibility of the system is poor and the control operation becomes very complex. The invention provides a control method of a DC/DC power converter, which comprises a first control mode and a second control mode, switches according to the duty ratio predetermined or not, and has the advantages of simple control and good system flexibility.
Referring to fig. 1, the DC/DC power converter of the present invention includes a transformer T1, and a primary side circuit and a secondary side circuit respectively connected to the transformer T1. The transformer T1 comprises a primary winding used for being connected with a primary circuit and a secondary winding used for being connected with a secondary circuit, wherein the secondary winding is a winding with a center tap;
the primary side circuit is a full-bridge circuit and comprises a switching tube QAAnd a switching tube QBAnd a switching tube QCAnd a switching tube QDWherein, the switch tube QAAnd a switching tube QBForm a first bridge arm and a switch tube QCAnd a switching tube QDForming a second bridge arm, connecting the first and second bridge arms in parallel, connecting an inductor L in series at the first end of the primary windingRBack-connected to the switching tube QAAnd a switching tube QBBetween the other end and the switch tube QBAnd a switching tube QDConnecting;
wherein, the switch tube QAAnd a switching tube QBSwitching tubes Q switched out of phase at a 50% duty cycle and a phase angle of 180 degreesCAnd a switching tube QDThe switching is out of phase at 50% duty cycle and 180 degree phase angle, and the PWM switching signal of the second leg is phase shifted compared to the first leg, and the amount of phase shift determines the time of simultaneous conduction between diagonal switches and also determines the amount of energy transfer. Wherein, the switch tube QAAnd a switching tube QBAnd a switching tube QCAnd a switching tube QDAre MOS tubes, are favorable for synchronous rectification operation, and have inductance LRThe leakage inductance of the transformer is connected with the MOS capacitor when resonance occurs, and zero voltage switching ZVS is realized.
The secondary side circuit is a current-doubling rectifying circuit and comprises a diode D1 and a diode D2, the anode of the diode D1 is connected with the first end of the secondary side winding, the anode of the diode D2 is connected with the second end of the secondary side winding, the cathode of the diode D2 is connected between the diode D1 and the inductor Lo, the center tap end of the secondary side winding is grounded, and a capacitor Co is further connected between the center tap end and the inductor Lo;
the diode D1 and the diode D2 can provide current rise times according to different changes of current ratios of the secondary circuit and the primary circuit, and simultaneously perform a rectification function to realize current-multiplying rectification, and the inductor Lo and the capacitor Co form an output filter to filter output voltage.
The full-bridge circuit and the current-doubling rectifying circuit are also provided with a port for grounding, which can be used for preventing the short circuit problem of the DC/DC power converter, wherein the full-bridge circuit is arranged on the switching tube QDThe double-current rectifying circuit is grounded at the central tapping end.
The output side of the full bridge circuit is connected with an input voltage Vin, and the output end of the current-doubling rectifying circuit is used for outputting an output voltage Vout after DC/DC conversion. According to the invention, the input signal of the DC/DC power converter is collected, the duty ratio information of the DC/DC power converter is obtained according to the input signal, when the duty ratio is predetermined, the DC/DC power converter adopts a first control mode, otherwise, when the duty ratio is not predetermined, the DC/DC power converter adopts a second control mode.
The first control mode is a PCMC control mode, the second control mode is a VMC control mode, and in order to directly detect the output voltage of the full bridge circuit, the starting point of ADC conversion (analog-to-digital conversion) needs to be set in each half PWM switching period to trigger. When the duty cycle of the full bridge circuit is not predetermined, the trigger point of the ADC conversion is unknown for the PCMC control mode, which will not accurately detect the output voltage of the full bridge circuit, and therefore, when switching between the first control mode and the second control mode, it is necessary to judge whether the duty cycle is predetermined, and only when the duty cycle is predetermined, the DC/DC power converter enters the first control mode, and when the duty cycle is not predetermined, the DC/DC power converter enters the second control mode.
Please refer to fig. 2, which is the present applicationThe invention discloses a block diagram for realizing a PCMC control mode, which simplifies the generation process of a PWM wave by utilizing peripheral control development board equipment so as to realize the PCMC function of software, wherein the peripheral control development board equipment comprises an on-chip analog comparator, a digital-to-analog converter (DAC), a PWM generation part and programmable on-chip slope compensation hardware. The PCMC control mode comprises the steps of comparing the primary side current of the transformer with a peak current reference calculated by a voltage loop of an on-chip comparator, and when the switching period reaches half, the energy accumulation of the primary side circuit reaches the maximum value, so that the current in the primary side circuit of the transformer needs to reach a reference value of a command peak value to execute algorithm operation, wherein one PWM waveform drives a diagonal switch (Q)B/QC) And resetting immediately, and ending the power transmission stage immediately to enable the input and output voltage transformation to be cleared quickly, so that the operation error can be eliminated from zero when the algorithm is executed in the next cycle after resetting. After passing through a programmable dead zone window, driving another switch PWM waveform on the same bridge arm and applying appropriate slope compensation, adding a slope with programmable negative slope to a peak reference current signal, repeatedly resetting and setting in one bridge arm to cause phase shift between PWM signals driving the two bridge arms, the phase shift amount and overlap between diagonal switches, depending on the amount of the peak reference current, the higher the peak reference current, the longer the corresponding PWM signal conduction time increases, and further the longer the overlap time between the diagonal switches, so that more energy is transferred to a secondary side circuit, and a controller peripheral device controls the energy transfer to regulate output by controlling the peak generation current value, therefore, the peak reference current is a controlled parameter.
According to the description in fig. 2, after an input signal passes through an ADC converter, the input signal can be converted into a digital signal, then a peak current command is obtained after passing through a voltage controller according to the primary current of the transformer, the feedback of the output voltage and the reference voltage, and after DAC conversion is performed on the peak current command, slope compensation is performed, and the slope compensation is transmitted to a PWM generator after being fed back through an exponential amplifier together with the input voltage, so that an output PWM signal can be obtained.
Referring to fig. 3, which is a block diagram of a VMC control mode according to an embodiment of the present invention, switches in each bridge arm are driven by complementary pulse modulation (PWM) signals with a fixed duty ratio (50%) and frequency, a controller directly drives and controls a phase shift of the PWM signal in one branch of a driving bridge relative to a switch in another driving switch, the phase shift determines an amount of overlap between diagonal switches, the longer an overlap time between the diagonal switches is, the longer an input voltage is applied to a primary winding of a transformer, and thus, the more energy is transferred to a secondary side, the controller controls energy transfer by directly controlling a phase shift between the PWM signals driving two bridge arms to adjust an output, in this case, the phase shift is a controlled parameter, and it should be noted that, as the VMC is implemented, a dc blocking capacitor needs to be arranged on the primary side of the transformer, the capacitor can block the primary current from overcurrent when the phase shift reaches a certain degree, so as to avoid saturation caused by magnetic flux imbalance caused by the change of the transformer with time in the process of executing the VMC algorithm.
According to the description of fig. 3, after an input signal passes through an ADC converter, the input signal is converted into a digital signal, and then, after passing through a voltage controller, a phase feedback is output according to a primary current of a transformer, an output voltage feedback, and a reference voltage, phase driving is performed after passing through an upper bridge to lower bridge dead zone and an upper bridge dead zone by a lower bridge, and a PWM signal is generated after being transmitted to a PWM generator, where a phase shift generated by the phase driving determines an amount of energy output to a secondary circuit.
Referring to fig. 4, which is a schematic diagram of the output voltage regulation method during load change, the regulated output voltage is easily affected by the change of the load condition, and this problem exists because the ripple of twice the switching frequency appears on the output voltage, and at low load, the peak-to-peak voltage ripple is relatively small, and at higher load, it increases significantly, and if the ADC conversion is triggered by the dead-end within one switching cycle, at high load (for the same average voltage), the detected ADC voltage results to be smaller.
Thus, for the same average output voltage, the controller sees a smaller output voltage at high load operation, where the controller compensation Δ Vadc will cause the actual output voltage value to increase with increasing load, where a solution is proposed to reduce such effects: setting the start point of the ADC conversion to be appropriately triggered in each half PWM switching cycle to directly detect the average output voltage, in which case this trigger point is unknown if PCMC implementations are used, since the duty cycle is not predetermined, in which case VMC control mode is used, although the average output voltage value can be calculated at a lower ramp rate and a loop with slower external control response can be used as a voltage loop to adjust the voltage reference or feedback, which may affect algorithm dynamic performance, so by oversampling it over one or two ripple cycles, the average output voltage can be calculated on a cycle-by-cycle basis, since the average output voltage is calculated over a full ripple cycle, any effect from high/low peak-to-peak ripple is avoided, and further, since the average value is calculated over one or two ripple cycles and used for the next PWM switching cycle, dynamic performance and control loop performance are not greatly affected by this approach requiring multiple ADC conversions within a single PWM half-cycle, which is the recommended scheme in implementing the PCMC control mode, in which the output voltage can be sampled eight times during the PWM switching period.
Meanwhile, a filter control is added in the ADC conversion, which can be used for attenuating the ripple and reducing the compensation Δ Vadc, and the operation can affect the dynamic performance of the system and the achievable loop bandwidth, while the output voltage characteristic is still unchanged.
Specifically, referring to fig. 5, which is a flowchart of a control method of the DC/DC power converter of the present invention, in the present embodiment, which is used for an air conditioning system, the ADC conversion is arranged before judging whether the duty ratio is predetermined, the starting point of the ADC conversion is arranged in each half PWM switching period, so that the average output voltage is convenient to detect, when the working condition of the air conditioner changes, the controller compensates, then the mode selection is carried out according to whether the duty ratio is predetermined or not, when the duty ratio is predetermined, the PCMC control mode is adopted, oversampling is performed for one or two pulse periods, an average value is calculated and used for the next PWM switching period, and when the duty ratio is not predetermined, the VMC control mode is employed, and performing ADC conversion initial triggering in each half cycle of the PWM signal, and outputting the PWM signal of the cycle and performing sampling correction operation of the next cycle after passing through a VMC control mode or a PCMC control mode. In the present embodiment, the control method of the DC/DC power converter is applied to the air conditioner control, and theoretically, the control method of the present invention can be applied to any control system of the DC/DC converter.
The invention also provides an air conditioner which comprises a driving system, wherein the driving system adopts the control method of the DC/DC power converter. When the working condition of the air conditioner is changed, the DC/DC power converter determines whether to switch a first control mode and a second control mode in advance according to the duty ratio of a switching tube in the full-bridge circuit; and when the working condition of the air conditioner is not changed, the DC/DC power converter maintains the current control mode.
Compared with the prior art, the invention provides a control method of a DC/DC power converter, which comprises a PCMC control mode and a VMC control mode, and switches according to whether the duty ratio is predetermined or not, the whole control logic is simple, the flexibility of the system is good, the operation speed is improved, and the problem that the control method cannot update control variable data timely due to over-slow operation speed, further the useful variable change data cannot be received timely, and the air conditioner has false alarm faults is solved.
The above examples are intended only to illustrate specific embodiments of the present invention. It should be noted that, for a person skilled in the art, several modifications and variations can be made without departing from the inventive concept, and these modifications and variations shall fall within the protective scope of the present invention.
Claims (12)
- A method of controlling a DC/DC power converter, the DC/DC power converter comprising: the control method comprises the following steps of: the control circuit comprises a first control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the peak current of the full-bridge circuit and a second control mode for adjusting the output voltage of the current-doubling rectifying circuit according to the phase shift of the PWM signal of the first bridge arm and the PWM signal of the second bridge arm in the full-bridge circuit, wherein the first control mode and the second control mode are switched according to the fact whether the duty ratio of a switching tube in the full-bridge circuit is predetermined or not.
- 2. The control method according to claim 1, wherein the first control mode and the second control mode are switched according to whether the duty ratio of the switching tube in the full-bridge circuit is predetermined or not comprises the following steps:collecting an input signal of the DC/DC power converter;judging whether a set duty ratio exists in the input signal;if yes, determining that the duty ratio of a switching tube in the full-bridge circuit is predetermined, and enabling the DC/DC power converter to enter a first control mode;if not, the duty ratio of a switching tube in the full-bridge circuit is judged not to be predetermined, and the DC/DC power converter enters a second control mode.
- 3. The control method according to claim 1, wherein the first control mode is a PCMC control mode including: when the switching period of the switching tubes in the primary circuit reaches half, any two switching tubes in different bridge arms in the primary circuit are driven to reset immediately, the input and output variables are cleared, after passing through a programmable dead zone window, PWM (pulse width modulation) waveform-slope compensation is carried out on the two switching tubes which are not reset, and then the output of the current-doubling rectifying circuit is regulated.
- 4. The control method according to claim 1, wherein the second control mode is a VMC control mode, which includes: the first bridge arm and the second bridge arm are driven by complementary pulse width modulation signals with fixed duty ratio and frequency, the phase shift of a PWM signal of any branch circuit compared with the phase shift of the other driving switch is adjusted, the PWM signal overlapping time of two switching tubes at any diagonal angle in the primary circuit is further adjusted, and the output of the current-doubling rectifying circuit is changed.
- 5. The control method of claim 1, further comprising performing an ADC conversion on the input signal before entering the first control mode or the second control mode, wherein a starting point of the ADC conversion is set in each half PWM switching period.
- 6. The control method of claim 5, further comprising a filtering control when performing ADC conversion.
- 7. The control method according to claim 1, wherein after the DC/DC power converter enters the first control mode or the second control mode for a switching period, the PWM signal of the period is output and the sampling correction operation of the next period is performed, and the operation mode of the next period is determined according to whether the current duty ratio is predetermined.
- 8. The control method according to claim 1, characterized in that the first bridge leg comprises series-connected switching tubes QAAnd a switching tube QBThe second bridge arm comprises switching tubes Q connected in seriesCAnd a switching tube QDSaid switch tube QAAnd a switching tube QBSwitched out of phase at 50% duty cycle and 180 degree phase angle, the switching tube QCAnd a switching tube QDSwitching out of phase at 50% duty cycle and 180 degrees phase angle.
- 9. The control method according to claim 1, wherein the full bridge circuit and the current doubler rectifier circuit are each provided with a port for grounding.
- 10. Air conditioner comprising a drive system, characterized in that said drive system employs a control method according to any one of claims 1 to 9.
- 11. The air conditioner of claim 10, wherein when the operating condition of the air conditioner changes, the DC/DC power converter switches the first control mode and the second control mode according to whether the duty ratio of the switching tube in the full bridge circuit is predetermined.
- 12. The air conditioner of claim 10, wherein the DC/DC power converter maintains a current control mode when a condition of the air conditioner is not changed.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283427A (en) * | 2013-07-02 | 2015-01-14 | 南京航空航天大学 | Primary side current control method of full-bridge DC-DC converter |
| CN112087140A (en) * | 2020-07-31 | 2020-12-15 | 西安电子科技大学 | Multi-mode automatic switching two-stage resonance DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283427A (en) * | 2013-07-02 | 2015-01-14 | 南京航空航天大学 | Primary side current control method of full-bridge DC-DC converter |
| CN112087140A (en) * | 2020-07-31 | 2020-12-15 | 西安电子科技大学 | Multi-mode automatic switching two-stage resonance DC-DC converter |
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| CN113644827B (en) | 2023-05-02 |
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