WO2023036220A1 - Peak and valley turn-on control method and controller - Google Patents

Peak and valley turn-on control method and controller Download PDF

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Publication number
WO2023036220A1
WO2023036220A1 PCT/CN2022/117716 CN2022117716W WO2023036220A1 WO 2023036220 A1 WO2023036220 A1 WO 2023036220A1 CN 2022117716 W CN2022117716 W CN 2022117716W WO 2023036220 A1 WO2023036220 A1 WO 2023036220A1
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Prior art keywords
peak
synchronous
valley
comparison result
rectification circuit
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PCT/CN2022/117716
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French (fr)
Chinese (zh)
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卢鹏飞
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广州金升阳科技有限公司
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Publication of WO2023036220A1 publication Critical patent/WO2023036220A1/en

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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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 switching power supply, in particular to a peak and valley opening control method and a controller.
  • the quasi-resonant flyback circuit Take the quasi-resonant flyback circuit as an example: turn on the main switch at the trough where the primary inductance of the transformer resonates with the parasitic capacitance of the main switch, and the ZVS of the main switch can be turned on. Since the primary inductance of the transformer is relatively large, the resonance period is long , the control circuit has enough time to realize from the valley detection, the internal logic processing to the valley turning on the main switch tube.
  • Figure 1 is a step-down synchronous rectification circuit
  • Figure 1b is a boost synchronous rectification circuit
  • the switching frequency is high, such as greater than 500KHz
  • the synchronous rectification circuit works at
  • the energy storage inductor L1 starts to resonate with the parasitic capacitance of the switch tube Q1 and the switch tube Q2, and the resonance frequency reaches about 10MHz.
  • Turning on the switching tube at the peak or valley to realize the ZVS switching of the switching tube puts forward extremely high requirements on the performance of the controller and the parameter matching of the power circuit.
  • the technical problem to be solved by the present invention is to propose a peak and valley opening controller and control method to ensure that when the switching power supply adopting synchronous rectification technology works in discontinuous mode, the main switching tube and the synchronous rectifying tube are just at the peak Or trough opening, realize ZVS opening, reduce EMI, and improve the efficiency of switching power supply.
  • the present invention adopts the following technical solutions:
  • the end time of the maximum switching frequency limit of the synchronous rectification circuit is obtained through a frequency limit timer.
  • the voltage at both ends of the energy storage inductor is compared by a comparator to obtain the comparison result signal.
  • the first predetermined time is obtained by a first timer, and the first timer is enabled by a rising edge of the comparison result signal or by a falling edge of the comparison result signal.
  • the second predetermined time is obtained by a second timer, and the second timer is enabled by a rising edge of the comparison result signal or by a falling edge of the comparison result signal.
  • the predetermined condition is:
  • Vin is the input voltage of the synchronous rectification circuit
  • Vo is the output voltage of the synchronous rectification circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the predetermined condition is:
  • Vin is the input voltage of the synchronous rectification circuit
  • Vo is the output voltage of the synchronous rectification circuit
  • Vth is a set voltage greater than or equal to 0V.
  • a peak and valley opening control method applied to a diode rectifier circuit, the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, characterized in that the peak and valley opening control method includes the following steps :
  • the end time of the highest switching frequency limit of the diode rectifier circuit is obtained through a frequency limit timer; the voltage at both ends of the energy storage inductor is compared by a comparator to obtain the comparison result signal; through the first The timer obtains the first predetermined time, and the first timer is enabled by the rising edge of the comparison result signal or by the falling edge of the comparison result signal.
  • the predetermined condition is:
  • Vin is the input voltage of the diode rectifier circuit
  • Vo is the output voltage of the diode rectifier circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the predetermined condition is:
  • Vin is the input voltage of the diode rectifier circuit
  • Vo is the output voltage of the diode rectifier circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the technical solution of the peak and valley opening controller provided by the present invention is as follows:
  • a peak and valley opening controller is applied to a synchronous rectification circuit, and the synchronous rectification circuit includes a main switch tube, a synchronous rectification tube and an energy storage inductor, and is characterized in that the peak and valley opening control method includes the following units:
  • the trigger unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit
  • a comparing unit configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal
  • the execution unit is used to select and execute one of the following actions according to the working state of the synchronous rectification circuit and predetermined conditions:
  • the triggering unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit through the frequency limit timer.
  • the comparison unit compares the voltages at both ends of the energy storage inductor through a comparator to obtain the comparison result signal.
  • the execution unit obtains the first predetermined time through a first timer, and the first timer is enabled by a rising edge of the comparison result signal or by a rising edge of the comparison result signal Falling edge enable.
  • the execution unit obtains the second predetermined time through a second timer, and the second timer is enabled by the rising edge of the comparison result signal or by a rising edge of the comparison result signal Falling edge enable.
  • the predetermined condition is:
  • Vin is the input voltage of the synchronous rectification circuit
  • Vo is the output voltage of the synchronous rectification circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the predetermined condition is:
  • Vin is the input voltage of the synchronous rectification circuit
  • Vo is the output voltage of the synchronous rectification circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the technical solution of the peak and valley opening controller provided by the present invention is as follows:
  • a peak and valley opening controller is applied to a diode rectifier circuit, and the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, and is characterized in that the peak and valley opening controller includes the following units :
  • a trigger unit configured to obtain the end time of the maximum switching frequency limit of the diode rectifier circuit
  • a comparing unit configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal
  • the execution unit starts counting at the moment when the signal of the comparison result is inverted, and controls the main switching tube at the The peak or trough of the connection node between the main switch tube and the synchronous rectifier tube is turned on.
  • the trigger unit obtains the end time of the maximum switching frequency limit of the diode rectifier circuit through a frequency limit timer; the comparison unit compares the voltages at both ends of the energy storage inductor through a comparator to obtain The comparison result signal; the execution unit obtains the first predetermined time through the first timer, and the first timer is enabled by the rising edge of the comparison result signal or by the The falling edge of the comparison result signal is enabled.
  • the predetermined condition is:
  • Vin is the input voltage of the diode rectifier circuit
  • Vo is the output voltage of the diode rectifier circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the predetermined condition is:
  • Vin is the input voltage of the diode rectifier circuit
  • Vo is the output voltage of the diode rectifier circuit
  • Vth is a set voltage greater than or equal to 0V.
  • the present invention has the following beneficial effects:
  • the peak or valley detection is not directly performed, but at the highest switch of the rectifier circuit
  • the voltage at both ends of the energy storage inductor is compared, and the signal of the comparison result is used to control the conduction of the switch tube in the rectifier circuit, so that the rectifier circuit works in discontinuous mode, and the connection node between the main switch tube and the rectifier tube can be
  • the peak or valley of high-frequency resonance realizes ZVS opening, which improves efficiency and reduces EMI noise.
  • Figure 1a is a schematic diagram of an existing step-down synchronous rectification circuit
  • Figure 1b is a schematic diagram of an existing step-up synchronous rectification circuit
  • Fig. 2 is a schematic diagram of the application of the peak and valley opening controller of the present invention in a synchronous rectification circuit
  • FIG. 3 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the first embodiment of the present invention
  • Fig. 4 is a timing diagram partially enlarged on the time axis of Fig. 3 of the present invention.
  • Fig. 5 is the first kind of internal circuit schematic diagram (the timer shares the same comparator output enabling signal) of the peak and valley opening controller of the present invention
  • FIG. 6 is a timing diagram of the synchronous rectification circuit working in the valley turn-on mode according to the first embodiment of the present invention
  • Fig. 7 is the second internal circuit schematic diagram of the peak and valley opening controller of the present invention (comparator output rising edge and falling edge enabling signals enable the timer respectively);
  • Fig. 8 is the 3rd kind of internal circuit schematic diagram (the enable signal of timer comes from respective comparator) of the third kind of internal circuit diagram of opening controller of peak and valley of the present invention
  • Fig. 9 is the fourth internal circuit schematic diagram of the peak and valley opening controller of the present invention (only realizing the peak or valley opening of the main switching tube);
  • Fig. 10 is the fifth internal circuit schematic diagram of the peak and valley opening controller of the present invention (only realizing the peak or valley opening of the synchronous rectifier);
  • FIG. 11 is a timing diagram of the synchronous rectification circuit working in the valley turn-on mode according to the second embodiment of the present invention.
  • FIG. 12 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the second embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the application of the peak and valley opening controller of the present invention in a synchronous rectification circuit.
  • the synchronous rectification circuit includes a first voltage transmission port P1, a second voltage transmission port P2, a grounding port GND switch tube Q1, a switch tube Q2 and energy storage inductor L1;
  • the drain of the switching tube Q1 is used to connect to the first voltage transmission port P1, the source of the switching tube Q1 is connected to the drain of the switching tube Q2 and one end of the energy storage inductor L1 at the same time, and the other end of the energy storage inductor L1 is used to connect to the second The voltage transmission port P2, the source of the switching tube Q2 is used to connect to the grounding port GND;
  • the first voltage transmission port P1 is the port for receiving the input voltage Vin
  • the second voltage transmission port P2 is the port for outputting the adjusted voltage Vo
  • the main switching tube is the switching tube Q1, synchronous rectification
  • the tube is the switching tube Q2;
  • the second voltage transmission port P2 is the port for receiving the input voltage Vin
  • the first voltage transmission port P1 is the port for outputting the adjusted voltage Vo
  • the main switching tube is the switching tube Q2, synchronous rectification
  • the tube is a switching tube Q1.
  • the peak-to-valley turn-on controller is integrated in the control IC of the synchronous rectification circuit, at least including a comparator and a timer.
  • the peak-to-valley turn-on controller samples both ends of the energy storage inductor L1 through the comparator at the end of the maximum switching frequency limit of the synchronous rectification circuit. The voltage is compared, and the timer is enabled at the rising or falling edge of the comparator output signal. When the timer ends, the soft opening of the main switching tube or synchronous rectifying tube can be realized at the peak or valley of the energy storage inductor L1 end Vs. .
  • Coss1 and Coss2 in FIG. 2 are the parasitic output capacitances of the switching tube Q1 and the switching tube Q2 respectively, which are drawn separately for the convenience of description.
  • the energy storage inductor L1 of the synchronous rectification circuit After the energy storage inductor L1 of the synchronous rectification circuit is demagnetized, the energy storage inductor L1 and the parasitic capacitance Coss1 of the switch tube Q1 and the parasitic capacitor Coss2 of the switch tube Q2 start to resonate, because the voltage Vs at one end of the energy storage inductor L1 has a high resonance frequency And there is damping attenuation, it is difficult to realize the peak or trough detection and turn on the switch tube at the peak or trough.
  • the present invention uses the voltage Vs at one end of the energy storage inductor L1 to keep each cycle of the resonant waveform unchanged and the voltage at the other end of the energy storage inductor L1
  • the characteristic of resonating as the center does not directly detect the peak or valley.
  • the peak and valley opening controller compares the voltage at both ends of the energy storage inductor L1 through the comparator at the end of the maximum switching frequency limit of the synchronous rectification circuit, and the output signal of the comparator
  • the timer is enabled at the time of the rising or falling edge, and the timing time of the timer is superimposed on the peak and valley to open the sampling, comparison, logic processing and driving of the controller. All delays are (n is an integer greater than or equal to zero, and T is the resonance period).
  • the timing of the timer can be set through the external pins of the peak and valley opening controller, or it can be programmed into the control IC in the form of a digital circuit.
  • the main switching tube or the synchronous rectifying tube can be turned on at the peak or valley of the resonance voltage Vs at one end of the energy storage inductor L1, so as to realize the soft turning on of the switching tube.
  • the synchronous rectification circuit of this embodiment works in a step-down state, the main switching tube is the switching tube Q1, and the synchronous rectifying tube is the switching tube Q2.
  • the peak-to-valley turn-on controller turns on the main switch Q1 at the peak of Vs resonance; when the input voltage Vin, output voltage Vo and The threshold voltage Vth satisfies the relational expression: when Vin-Vth>2*Vo, when the energy storage inductance L1 of the synchronous rectification circuit is demagnetized, the peak-to-valley turn-on controller turns on the synchronous rectifier tube Q2 at the valley of Vs resonance; the threshold voltage Vth is greater than or equal to zero volts.
  • Fig. 3 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the first embodiment of the present invention, please refer to Fig. 3, the Timer in Fig. 3 is the output waveform of a frequency-limiting timer, which is used to limit the synchronous rectification circuit The highest switching frequency, the frequency-limiting timer Timer is enabled when the main switching tube Q1 is turned on.
  • V gs1 is the control signal waveform of the gate of the main switching transistor Q1
  • V gs2 is the control signal waveform of the gate of the synchronous rectifier Q2
  • i L1 is the current waveform flowing through the energy storage inductance L1
  • V S is the energy storage inductance L1
  • the voltage range of Vin is 18V to 75V.
  • the Vin voltage is 30V
  • the Vo voltage is 12V
  • the threshold voltage Vth is 10V. This is called the working state 1.
  • the energy storage inductor L1 is turned off synchronously at the end of demagnetization at time t3. Rectifier tube Q2, energy storage inductor L1, and parasitic capacitance Coss1 and parasitic capacitance Coss2 resonate around the output voltage Vo. Theoretically, the lowest voltage of resonance is 0V, and the highest voltage is 2*Vo.
  • FIG. 3 shows the specific working process of the synchronous rectification circuit in working state 1, from t 0 to t 0 +T within a working cycle T, as follows:
  • t0 ⁇ t1 stage also known as the excitation stage, the main switch Q1 is turned on at t0, the frequency limit timer Timer starts timing, the voltage across the energy storage inductor L1 is equal to the input voltage Vin minus the output voltage Vo, the energy storage inductor L1 Current i L1 with slope rise.
  • Stage t1 ⁇ t2 turn off the main switching tube Q1 at time t1, the current i L1 of the energy storage inductor L1 charges the parasitic capacitor Coss1 of the main switching tube Q1, discharges the parasitic capacitor Coss2 of the synchronous rectifier tube Q2, and one end of the energy storage inductor L1 Vs
  • the voltage of V drops from equal to the input voltage Vin to 0V, and the synchronous rectifier Q2 realizes ZVS opening at time t2.
  • t2 ⁇ t3 stage also known as the demagnetization stage, the current i L1 of the energy storage inductor L1 with a slope The current i L1 of the energy storage inductor L1 drops to zero at time t3, and the demagnetization ends.
  • the synchronous rectifier Q2 is turned off, and the demagnetization end time t3 is earlier than the frequency limit timer timer end time t ⁇ .
  • t3 ⁇ t0+T stage also known as the resonance stage.
  • this stage is enlarged according to the time axis to obtain Figure 4. Please refer to Figure 4. From the time t3, the voltage at one end Vs of the energy storage inductor L1 Start to resonate, and Fig. 5 is the first internal circuit schematic diagram of the peak and valley opening controller of the present invention, please refer to Fig.
  • the other conditions of the above working state 1 remain unchanged, and only the Vin voltage rises to 60V as an example for illustration, which is called working state 2.
  • the timer enable selection module in Figure 5 is based on Vin-Vth>2*Vo in this working condition , it is determined that only the second timer can be enabled at the rising edge of the comparator output signal, and the synchronous rectifier Q2 is turned on at the valley of Vs resonance, so as to realize the soft turn-on of the synchronous rectifier Q2.
  • FIG. 6 is a timing diagram of the synchronous rectification circuit working in the valley opening mode according to the first embodiment of the present invention. Please refer to FIG. 6.
  • FIG. 6 shows the specific working process of the working state 2 in a working cycle T, as follows:
  • the t0 ⁇ t3 stage is the same as the working process of the working state 1.
  • t3 ⁇ t4 stage also called the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, please refer to Figure 5, and compare the two voltages of the energy storage inductor L1 from the end time t ⁇ of the frequency limit timer Timer
  • the Vs voltage starts to change from greater than Vo to less than Vo
  • the output voltage of the comparator in Figure 5 begins to reverse
  • the second timer is enabled at the rising edge of the comparator output signal
  • the second timer is at t4
  • the synchronous rectifier Q2 is turned on at the trough of Vs resonance to realize the soft turn-on of the synchronous rectifier Q2. From time f to time t4, it can be as shown in Figure 6 can also be or wait.
  • t4 ⁇ t5 stage also known as the reverse stage, the current i L1 of the energy storage inductor L1 is at a slope The current drops from zero to negative, and the synchronous rectifier Q2 is turned off at time t5.
  • the output voltage Vo discharges the parasitic capacitor Coss1 of the main switching tube Q1 through the energy storage inductor L1, and charges the parasitic capacitor Coss2 of the synchronous switching tube Q2, and the voltage at one end Vs of the energy storage inductor L1 is at the time t0+T greater than Vin-Vth, the ZVS of the main switch Q1 is turned on.
  • the internal circuit schematic diagram of the peak-to-valley opening controller also has the connection forms in Figure 7 to Figure 10.
  • the connection relationship between the positive and negative input terminals of their comparators can be exchanged, and the rising edge of the comparator output signal enables and The falling edge enable can be exchanged, and only a slight modification of the control logic is required. Since there are many connection relationships and logical relationships in the internal circuit schematic diagram of the peak and valley opening controller, there are many permutations and combinations in the embodiment of the present invention. Explanation, the following is only a brief description of the differences between Figures 7 to 10:
  • the first timer and the second timer in Fig. 5 adopt the same comparator output enable signal
  • the first timer in Fig. 7 and the second timer adopt the opposite comparator output enable signal
  • the comparator in Fig. 8 The first timer and the second timer use independent comparators to output enable signals
  • Fig. 9 and Fig. 10 can only realize the peak or trough soft turn-on of the main switch Q1 or the synchronous rectifier Q2.
  • the synchronous rectification circuit of this embodiment works in a boost state
  • the main switching tube is the switching tube Q2
  • the synchronous rectifying tube is the switching tube Q1.
  • the following description mainly focuses on the content different from the first embodiment.
  • t0 ⁇ t1 stage also known as the excitation stage
  • the main switch Q2 is turned on at t0
  • the frequency limit timer Timer starts timing
  • the current i L1 of the energy storage inductor L1 follows the slope rise.
  • Stage t1 ⁇ t2 turn off the main switching tube Q2 at time t1, the current i L1 of the energy storage inductor L1 charges the parasitic capacitor Coss2 of the main switching tube Q2, discharges the parasitic capacitor Coss1 of the synchronous rectifier tube Q1, and one end of the energy storage inductor L1 Vs The voltage rises from 0V to the output voltage Vo, and the synchronous rectifier Q1 realizes the ZVS opening at time t2.
  • the voltage across the energy storage inductor L1 is equal to the output voltage Vo minus the input voltage Vin, and the current i L1 of the energy storage inductor L1 is proportional to the slope
  • the current i L1 of the energy storage inductor L1 drops to zero at time t3, and the demagnetization ends.
  • the synchronous rectifier Q1 is turned off, and the demagnetization end time t3 is earlier than the frequency limit timer timer end time t ⁇ .
  • t3 ⁇ t0+T stage also known as the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, and the internal circuit schematic diagram of the peak and valley opening controller can be as shown in Figure 5, Figure 7, Figure 8, Any one of Fig. 9 is now illustrated by taking Fig. 5 as an example. Please refer to Fig. 5. From the end time t ⁇ of the frequency-limiting timer Timer, the voltage at both ends of the energy storage inductance L1 is compared, and the Vs voltage starts from greater than Vin becomes smaller than Vin, the output voltage of the comparator starts to flip, and the first timer is enabled at the rising edge of the comparator output signal.
  • the first timer ends timing at time t0+T and at the valley of Vs resonance Turn on the main switching tube Q2 to realize the soft opening of the main switching tube Q2.
  • Figure 2 shows that when the synchronous rectification circuit works in boost and Vin-Vth>2*Vo, corresponding to working state 4, the timer enable selection module in Figure 5 determines the comparison according to the relationship Vin-Vth>2*Vo Only the second timer can be enabled at the rising edge of the output signal of the device, and the synchronous rectifier Q2 is turned on at the peak of Vs resonance, so as to realize the soft turn-on of the synchronous rectifier Q2.
  • Fig. 12 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the second embodiment of the present invention. Please refer to Fig. 12.
  • Fig. 12 shows the specific working process of the working state 4 in a working cycle T, as follows:
  • the t0-t3 stage is the same as the t0-t3 stage of the working state 3.
  • t3 ⁇ t4 stage also known as the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, and the internal circuit schematic diagram of the peak and valley opening controller can be as shown in Figure 5, Figure 7, Figure 8, and Figure 10 Any one of the two methods is illustrated by taking Figure 5 as an example. Please refer to Figure 5. From the end time t ⁇ of the frequency-limiting timer Timer, the voltage at both ends of the energy storage inductor L1 is compared.
  • the Vs voltage changes from less than Vin to If it is greater than Vin, the output voltage of the comparator in Figure 5 starts to reverse to generate a falling edge signal, but the timer described in Figure 5 only recognizes the rising edge, so the timer does not act, and the Vs voltage starts to change from greater than Vin to less than Vin, the output voltage of the comparator in Figure 5 starts to reverse, the second timer is enabled at the rising edge of the comparator output signal, the second timer ends timing at t4, and the synchronous rectifier Q1 is turned on at the peak of Vs resonance , to realize the soft opening of the synchronous rectifier Q1.
  • t4 ⁇ t5 stage also known as the reverse stage, the current i L1 of the energy storage inductor L1 is at a slope The current drops from zero to negative, and the synchronous rectifier tube Q1 is turned off at time t5.
  • the energy storage inductor L1 discharges the parasitic capacitor Coss2 of the main switching tube Q2, charges the parasitic capacitor Coss1 of the synchronous switching tube Q1, and the voltage at one end Vs of the energy storage inductor L1 is less than Vth at the time t0+T, realizing The ZVS of the main switching tube Q2 is turned on.
  • the present invention is also applicable to the diode rectifier circuit, that is, the synchronous rectifier in Fig. 2 is replaced with a diode. At this time, only the main switching tube needs to be controlled, and the corresponding circuit structure of the controller can be deleted or not. However, the specific control process and internal structure of the controller can be deduced from the first embodiment and the second embodiment by suspending relevant pins, pulling them high or low, and will not be repeated here.

Abstract

Disclosed are a peak and valley turn-on control method and controller, which are applied to a synchronous rectification circuit. The synchronous rectification circuit comprises a main switching tube, a synchronous rectifier tube, and an energy storage inductor. The method comprises the following steps: obtaining a maximum switching frequency limit end time point of the synchronous rectification circuit; comparing voltages at two ends of the energy storage inductor at the end time point to obtain a comparison result signal; according to the working status of the synchronous rectification circuit and a predetermined condition, selecting to execute one of the following actions: starting timing at a time point when the comparison result signal is inverted, and after first predetermined time is over, controlling the main switching tube to be turned on at a peak or valley of a node connecting the main switching tube and the synchronous rectifier tube; and starting timing at the time point when the comparison result signal is inverted, and after second predetermined time is over, controlling the synchronous rectifier tube to be turned on at the peak or valley of the node connecting the main switching tube and the synchronous rectifier tube. The present invention can improve the power density and efficiency of a switching converter, reduce volume, and reduce EMI and costs.

Description

一种波峰波谷开通控制方法及控制器A peak and valley opening control method and controller 技术领域technical field
本发明涉及开关电源，特别涉及波峰波谷开通控制方法及控制器。The invention relates to a switching power supply, in particular to a peak and valley opening control method and a controller.
背景技术Background technique
随着电源技术的发展，高频、高效率、高功率密度的同步整流电路已经成为一种趋势，硬开关技术在高频开关时开关损耗较大，降低了电路的效率，电磁干扰问题也较为严重，为解决该问题，软开关技术被发展并逐渐应用在变换器中以降低开关损耗和EMI噪声，具体地，主要是指零电压开关(ZVS)技术以实现MOS管的零电压开通。With the development of power supply technology, high-frequency, high-efficiency, high-power-density synchronous rectification circuits have become a trend. Hard switching technology has a large switching loss during high-frequency switching, which reduces the efficiency of the circuit, and the problem of electromagnetic interference is also more serious. Seriously, in order to solve this problem, soft switching technology is developed and gradually applied in converters to reduce switching loss and EMI noise, specifically, it mainly refers to zero voltage switching (ZVS) technology to realize zero voltage turn-on of MOS tubes.
以准谐振反激电路为例：在变压器原边电感和主开关管的寄生电容谐振的波谷开通主开关管，可实现主开关管ZVS开通，由于变压器原边电感量比较大，所以谐振周期长，控制电路有足够的时间实现从波谷检测，内部逻辑处理到波谷开通主开关管。Take the quasi-resonant flyback circuit as an example: turn on the main switch at the trough where the primary inductance of the transformer resonates with the parasitic capacitance of the main switch, and the ZVS of the main switch can be turned on. Since the primary inductance of the transformer is relatively large, the resonance period is long , the control circuit has enough time to realize from the valley detection, the internal logic processing to the valley turning on the main switch tube.
但是对于图1a和图1b所示的同步整流电路，其中，图1为降压同步整流电路，图1b为升压同步整流电路，当开关频率较高时，如大于500KHz，同步整流电路工作在断续模式且储能电感L1完成去磁后，储能电感L1与开关管Q1和开关管Q2的寄生电容开始谐振，谐振频率达到10MHz左右，在如此高的谐振频率下进行波峰或波谷检测并在波峰或波谷处开通开关管，以实现开关管的ZVS开通，对控制器的性能，功率电路的参数匹配提出了极高的要求，目前尚未有文献提及或产品实现此功能。However, for the synchronous rectification circuits shown in Figure 1a and Figure 1b, among them, Figure 1 is a step-down synchronous rectification circuit, Figure 1b is a boost synchronous rectification circuit, when the switching frequency is high, such as greater than 500KHz, the synchronous rectification circuit works at After the discontinuous mode and the demagnetization of the energy storage inductor L1 is completed, the energy storage inductor L1 starts to resonate with the parasitic capacitance of the switch tube Q1 and the switch tube Q2, and the resonance frequency reaches about 10MHz. Turning on the switching tube at the peak or valley to realize the ZVS switching of the switching tube puts forward extremely high requirements on the performance of the controller and the parameter matching of the power circuit. At present, there is no literature mentioning or product realizing this function.
发明内容Contents of the invention
有鉴于此，本发明解决的技术问题在于：提出一种波峰波谷开通控制器及控制方法，以保证采用同步整流技术的开关电源工作在断续模式时，主开关管和同步整流管刚好在波峰或波谷开通，实现ZVS开通，降低EMI，提高开关电源的效率。In view of this, the technical problem to be solved by the present invention is to propose a peak and valley opening controller and control method to ensure that when the switching power supply adopting synchronous rectification technology works in discontinuous mode, the main switching tube and the synchronous rectifying tube are just at the peak Or trough opening, realize ZVS opening, reduce EMI, and improve the efficiency of switching power supply.
为了解决上述技术问题，本发明采用以下技术方案：In order to solve the above technical problems, the present invention adopts the following technical solutions:
针对同步整流电路应用场景，本发明提供的波峰波谷开通控制方法的技术方案如下：For the application scenario of synchronous rectification circuit, the technical solution of the peak and valley opening control method provided by the present invention is as follows:
一种波峰波谷开通控制方法，应用于同步整流电路，所述的同步整流电路包括主开关管、同步整流管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下步骤：A method for controlling opening of peaks and valleys, applied to a synchronous rectification circuit, wherein the synchronous rectification circuit includes a main switching tube, a synchronous rectification tube, and an energy storage inductor, characterized in that the method for controlling opening of peaks and valleys includes the following steps:
获得同步整流电路的最高开关频率限制结束时刻；Obtain the end time of the maximum switching frequency limit of the synchronous rectification circuit;
在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；Comparing the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
根据所述的同步整流电路的工作状态，以及预定的条件，选择执行如下动作之一：According to the working state of the synchronous rectification circuit and the predetermined conditions, choose to perform one of the following actions:
在所述的比较结果信号翻转时刻开始计时，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通；Start counting when the signal of the comparison result is reversed, and control the main switch to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the first predetermined time is over;
在所述的比较结果信号翻转时刻开始计时，在第二预定时间结束后，控制所述的同步整流管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。Start counting when the signal of the comparison result is reversed, and control the synchronous rectifier to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the second predetermined time is over.
优选地，通过限频定时器获得同步整流电路的最高开关频率限制结束时刻。Preferably, the end time of the maximum switching frequency limit of the synchronous rectification circuit is obtained through a frequency limit timer.
优选地，通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号。Preferably, the voltage at both ends of the energy storage inductor is compared by a comparator to obtain the comparison result signal.
优选地，通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the first predetermined time is obtained by a first timer, and the first timer is enabled by a rising edge of the comparison result signal or by a falling edge of the comparison result signal.
优选地，通过第二定时器获得所述的第二预定时间，所述的第二定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the second predetermined time is obtained by a second timer, and the second timer is enabled by a rising edge of the comparison result signal or by a falling edge of the comparison result signal.
进一步地，所述的同步整流电路的工作状态为降压时，所述的预定条件为：Further, when the working state of the synchronous rectification circuit is step-down, the predetermined condition is:
当Vin-Vth<＝2*Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, select the main switching tube to be turned on at the peak of the connecting node between the main switching tube and the synchronous rectifier tube after the end of the first predetermined time;
当Vin-Vth>2*Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When Vin-Vth>2*Vo, select the synchronous rectifier to be turned on at the trough of the connection node between the main switch and the synchronous rectifier after the second predetermined time;
其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
进一步地，所述的同步整流电路的工作状态为升压时，所述的预定条件为：Further, when the working state of the synchronous rectification circuit is boosting, the predetermined condition is:
当2*Vin-Vth<＝Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, select the main switching tube to be turned on at the trough of the connecting node between the main switching tube and the synchronous rectifier after the first predetermined time;
当2*Vin-Vth>Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When 2*Vin-Vth>Vo, select the synchronous rectifier to be turned on at the peak of the connection node between the main switch and the synchronous rectifier after the second predetermined time ends;
其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
针对二极管整流电路应用场景，本发明提供的波峰波谷开通控制方法的技术方案如下：For the application scenario of a diode rectifier circuit, the technical solution of the peak and valley opening control method provided by the present invention is as follows:
一种波峰波谷开通控制方法，应用于二极管整流电路，所述的二极管整流电路包括主开关管、整流二级管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下步骤：A peak and valley opening control method, applied to a diode rectifier circuit, the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, characterized in that the peak and valley opening control method includes the following steps :
获得所述的二极管整流电路的最高开关频率限制结束时刻；obtaining the end time of the maximum switching frequency limit of the diode rectifier circuit;
在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；Comparing the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
在所述的比较结果信号翻转时刻开始计时，根据所述的二极管整流电路的工作状态，以及预定的条件，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰处开通。Start counting at the moment when the signal of the comparison result is reversed, and according to the working state of the diode rectifier circuit and predetermined conditions, after the first predetermined time, control the main switching tube in the main switching tube The crest of the node connected to the synchronous rectifier is opened.
优选地，通过限频定时器获得所述的二极管整流电路的最高开关频率限制结束时刻；通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号；通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the end time of the highest switching frequency limit of the diode rectifier circuit is obtained through a frequency limit timer; the voltage at both ends of the energy storage inductor is compared by a comparator to obtain the comparison result signal; through the first The timer obtains the first predetermined time, and the first timer is enabled by the rising edge of the comparison result signal or by the falling edge of the comparison result signal.
进一步地，所述的二极管整流电路工作的工作状态为降压时，所述的预定条件为：Further, when the working state of the diode rectifier circuit is step-down, the predetermined condition is:
当Vin-Vth<＝2*Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, the main switch is turned on at the peak of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
进一步地，所述的二极管整流电路的工作状态为升压时，所述的预定条件为：Further, when the working state of the diode rectifier circuit is boosting, the predetermined condition is:
当2*Vin-Vth<＝Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, the main switch is turned on at the valley of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
针对同步整流电路应用场景，本发明提供的波峰波谷开通控制器的技术方案如下：For the application scenario of the synchronous rectification circuit, the technical solution of the peak and valley opening controller provided by the present invention is as follows:
一种波峰波谷开通控制器，应用于同步整流电路，所述的同步整流电路包括主开关管、同步整流管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下单元：A peak and valley opening controller is applied to a synchronous rectification circuit, and the synchronous rectification circuit includes a main switch tube, a synchronous rectification tube and an energy storage inductor, and is characterized in that the peak and valley opening control method includes the following units:
触发单元，获得同步整流电路的最高开关频率限制结束时刻；The trigger unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit;
比较单元，用于在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；A comparing unit, configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
执行单元，用于根据所述的同步整流电路的工作状态，以及预定的条件，选择执行如下动作之一：The execution unit is used to select and execute one of the following actions according to the working state of the synchronous rectification circuit and predetermined conditions:
在所述的比较结果信号翻转时刻开始计时，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通；Start counting when the signal of the comparison result is reversed, and control the main switch to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the first predetermined time is over;
在所述的比较结果信号翻转时刻开始计时，在第二预定时间结束后，控制所述的同步整流管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。Start counting when the signal of the comparison result is reversed, and control the synchronous rectifier to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the second predetermined time is over.
优选地，所述的触发单元通过限频定时器获得同步整流电路的最高开关频率限制结束时刻。Preferably, the triggering unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit through the frequency limit timer.
优选地，所述的比较单元通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号。Preferably, the comparison unit compares the voltages at both ends of the energy storage inductor through a comparator to obtain the comparison result signal.
优选地，所述的执行单元通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the execution unit obtains the first predetermined time through a first timer, and the first timer is enabled by a rising edge of the comparison result signal or by a rising edge of the comparison result signal Falling edge enable.
优选地，所述的执行单元通过第二定时器获得所述的第二预定时间，所述的第二定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the execution unit obtains the second predetermined time through a second timer, and the second timer is enabled by the rising edge of the comparison result signal or by a rising edge of the comparison result signal Falling edge enable.
进一步地，所述的同步整流电路的工作状态为降压时，所述的预定条件为：Further, when the working state of the synchronous rectification circuit is step-down, the predetermined condition is:
当Vin-Vth<＝2*Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, select the main switching tube to be turned on at the peak of the connecting node between the main switching tube and the synchronous rectifier tube after the end of the first predetermined time;
当Vin-Vth>2*Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When Vin-Vth>2*Vo, select the synchronous rectifier to be turned on at the trough of the connection node between the main switch and the synchronous rectifier after the second predetermined time;
其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
进一步地，所述的同步整流电路的工作状态为升压时，所述的预定条件为：Further, when the working state of the synchronous rectification circuit is boosting, the predetermined condition is:
当2*Vin-Vth<＝Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, select the main switching tube to be turned on at the trough of the connecting node between the main switching tube and the synchronous rectifier after the first predetermined time;
当2*Vin-Vth>Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When 2*Vin-Vth>Vo, select the synchronous rectifier to be turned on at the peak of the connection node between the main switch and the synchronous rectifier after the second predetermined time ends;
其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
针对二极管整流电路应用场景，本发明提供的波峰波谷开通控制器的技术方案如下：For the application scenario of the diode rectifier circuit, the technical solution of the peak and valley opening controller provided by the present invention is as follows:
一种波峰波谷开通控制器，应用于二极管整流电路，所述的二极管整流电路包括主开关管、整流二级管和储能电感，其特征在于，所述的波峰波谷开通控制器，包括如下单元：A peak and valley opening controller is applied to a diode rectifier circuit, and the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, and is characterized in that the peak and valley opening controller includes the following units :
触发单元，用于获得所述的二极管整流电路的最高开关频率限制结束时刻；A trigger unit, configured to obtain the end time of the maximum switching frequency limit of the diode rectifier circuit;
比较单元，用于在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；A comparing unit, configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
执行单元，在所述的比较结果信号翻转时刻开始计时，根据所述的二极管整流电路的工作状态，以及预定的条件，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。The execution unit starts counting at the moment when the signal of the comparison result is inverted, and controls the main switching tube at the The peak or trough of the connection node between the main switch tube and the synchronous rectifier tube is turned on.
优选地，所述的触发单元通过限频定时器获得所述的二极管整流电路的最高开关频率限制结束时刻；所述的比较单元通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号；所述的执行单元通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。Preferably, the trigger unit obtains the end time of the maximum switching frequency limit of the diode rectifier circuit through a frequency limit timer; the comparison unit compares the voltages at both ends of the energy storage inductor through a comparator to obtain The comparison result signal; the execution unit obtains the first predetermined time through the first timer, and the first timer is enabled by the rising edge of the comparison result signal or by the The falling edge of the comparison result signal is enabled.
进一步地，所述的二极管整流电路的工作状态为降压时，所述的预定条件为：Further, when the working state of the diode rectifier circuit is step-down, the predetermined condition is:
当Vin-Vth<＝2*Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, the main switch is turned on at the peak of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
进一步地，所述的二极管整流电路的工作状态为升压时，所述的预定条件为：Further, when the working state of the diode rectifier circuit is boosting, the predetermined condition is:
当2*Vin-Vth<＝Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, the main switch is turned on at the valley of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
与现有技术相比，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
利用整流电路储能电感一端的电压Vs谐振波形的每个周期保持不变，且以储能电感另一端电压为中心进行谐振的特点，不直接进行波峰或波谷检测，而是在整流电路最高开关频率限制结束时刻通过对储能电感两端电压进行比较，利用比较结果信号控制整流电路中开关管的导通，从而使得整流电路工作在断续模式下，可在主开关管与整流管连接节点的高频谐振的波峰或波谷实现ZVS开通，提高了效率，降低了EMI噪声。Using the characteristics of the voltage Vs at one end of the energy storage inductor of the rectifier circuit to remain unchanged in each cycle of the resonance waveform, and to resonate with the voltage at the other end of the energy storage inductor as the center, the peak or valley detection is not directly performed, but at the highest switch of the rectifier circuit At the end of the frequency limit, the voltage at both ends of the energy storage inductor is compared, and the signal of the comparison result is used to control the conduction of the switch tube in the rectifier circuit, so that the rectifier circuit works in discontinuous mode, and the connection node between the main switch tube and the rectifier tube can be The peak or valley of high-frequency resonance realizes ZVS opening, which improves efficiency and reduces EMI noise.
附图说明Description of drawings
图1a为现有降压同步整流电路原理图；Figure 1a is a schematic diagram of an existing step-down synchronous rectification circuit;
图1b为现有升压同步整流电路原理图；Figure 1b is a schematic diagram of an existing step-up synchronous rectification circuit;
图2为本发明的波峰波谷开通控制器在同步整流电路中的应用原理图；Fig. 2 is a schematic diagram of the application of the peak and valley opening controller of the present invention in a synchronous rectification circuit;
图3为本发明第一实施例涉及的同步整流电路工作在波峰开通模式的时序 图；FIG. 3 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the first embodiment of the present invention;
图4为本发明图3在时间轴局部放大的时序图；Fig. 4 is a timing diagram partially enlarged on the time axis of Fig. 3 of the present invention;
图5为本发明波峰波谷开通控制器的第一种内部电路原理图(定时器共用相同的比较器输出使能信号)；Fig. 5 is the first kind of internal circuit schematic diagram (the timer shares the same comparator output enabling signal) of the peak and valley opening controller of the present invention;
图6为本发明第一实施例涉及的同步整流电路工作在波谷开通模式的时序图；FIG. 6 is a timing diagram of the synchronous rectification circuit working in the valley turn-on mode according to the first embodiment of the present invention;
图7为本发明波峰波谷开通控制器的第二种内部电路原理图(比较器输出上升沿和下降沿使能信号分别对定时器使能)；Fig. 7 is the second internal circuit schematic diagram of the peak and valley opening controller of the present invention (comparator output rising edge and falling edge enabling signals enable the timer respectively);
图8为本发明波峰波谷开通控制器的第三种内部电路原理图(定时器的使能信号来自各自的比较器)；Fig. 8 is the 3rd kind of internal circuit schematic diagram (the enable signal of timer comes from respective comparator) of the third kind of internal circuit diagram of opening controller of peak and valley of the present invention;
图9为本发明波峰波谷开通控制器的第四种内部电路原理图(仅实现主开关管的波峰或波谷开通)；Fig. 9 is the fourth internal circuit schematic diagram of the peak and valley opening controller of the present invention (only realizing the peak or valley opening of the main switching tube);
图10为本发明波峰波谷开通控制器的第五种内部电路原理图(仅实现同步整流管的波峰或波谷开通)；Fig. 10 is the fifth internal circuit schematic diagram of the peak and valley opening controller of the present invention (only realizing the peak or valley opening of the synchronous rectifier);
图11为本发明第二实施例涉及的同步整流电路工作在波谷开通模式的时序图；FIG. 11 is a timing diagram of the synchronous rectification circuit working in the valley turn-on mode according to the second embodiment of the present invention;
图12为本发明第二实施例涉及的同步整流电路工作在波峰开通模式的时序图；FIG. 12 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the second embodiment of the present invention;
上述附图并不限制本发明构思的范围，而是通过参考特定实施例为本领域技术人员说明本发明的概念。The above drawings do not limit the scope of the inventive concept but illustrate the inventive concept for those skilled in the art by referring to specific embodiments.
具体实施方式Detailed ways
图2所示为本发明的波峰波谷开通控制器在同步整流电路中的应用原理图，同步整流电路包括第一电压传输端口P1、第二电压传输端口P2、接地端口GND开关管Q1、开关管Q2以及储能电感L1；Figure 2 is a schematic diagram of the application of the peak and valley opening controller of the present invention in a synchronous rectification circuit. The synchronous rectification circuit includes a first voltage transmission port P1, a second voltage transmission port P2, a grounding port GND switch tube Q1, a switch tube Q2 and energy storage inductor L1;
开关管Q1的漏极用于连接第一电压传输端口P1，开关管Q1的源极同时连接开关管Q2的漏极和储能电感L1的一端，储能电感L1的另一端用于连接第二电压传输端口P2，开关管Q2的源极用于连接接地端口GND；The drain of the switching tube Q1 is used to connect to the first voltage transmission port P1, the source of the switching tube Q1 is connected to the drain of the switching tube Q2 and one end of the energy storage inductor L1 at the same time, and the other end of the energy storage inductor L1 is used to connect to the second The voltage transmission port P2, the source of the switching tube Q2 is used to connect to the grounding port GND;
当同步整流电路工作在降压时，第一电压传输端口P1为接收输入电压Vin的端口、第二电压传输端口P2为输出调整后的电压Vo的端口，主开关管为开 关管Q1，同步整流管为开关管Q2；When the synchronous rectification circuit works in step-down, the first voltage transmission port P1 is the port for receiving the input voltage Vin, the second voltage transmission port P2 is the port for outputting the adjusted voltage Vo, and the main switching tube is the switching tube Q1, synchronous rectification The tube is the switching tube Q2;
当同步整流电路工作在升压时，第二电压传输端口P2为接收输入电压Vin的端口、第一电压传输端口P1为输出调整后的电压Vo的端口，主开关管为开关管Q2，同步整流管为开关管Q1。When the synchronous rectification circuit works in boost, the second voltage transmission port P2 is the port for receiving the input voltage Vin, the first voltage transmission port P1 is the port for outputting the adjusted voltage Vo, and the main switching tube is the switching tube Q2, synchronous rectification The tube is a switching tube Q1.
波峰波谷开通控制器集成于同步整流电路的控制IC内，至少包括比较器和定时器，波峰波谷开通控制器在同步整流电路最高开关频率限制结束时刻通过比较器对储能电感L1两端采样得到的电压进行比较，在比较器输出信号的上升或下降沿时刻使能定时器，定时器定时结束时可在储能电感L1一端Vs的波峰或波谷处实现主开关管或同步整流管的软开通。The peak-to-valley turn-on controller is integrated in the control IC of the synchronous rectification circuit, at least including a comparator and a timer. The peak-to-valley turn-on controller samples both ends of the energy storage inductor L1 through the comparator at the end of the maximum switching frequency limit of the synchronous rectification circuit. The voltage is compared, and the timer is enabled at the rising or falling edge of the comparator output signal. When the timer ends, the soft opening of the main switching tube or synchronous rectifying tube can be realized at the peak or valley of the energy storage inductor L1 end Vs. .
图2中的Coss1和Coss2分别为开关管Q1和开关管Q2的寄生输出电容，为了方便描述单独绘制出来。Coss1 and Coss2 in FIG. 2 are the parasitic output capacitances of the switching tube Q1 and the switching tube Q2 respectively, which are drawn separately for the convenience of description.
当同步整流电路的储能电感L1完成去磁后，储能电感L1与开关管Q1的寄生电容Coss1和开关管Q2的寄生电容Coss2开始谐振，由于储能电感L1一端的电压Vs的谐振频率高且存在阻尼衰减，难以实现波峰或波谷检测并在波峰或波谷处开通开关管，本发明利用储能电感L1一端的电压Vs谐振波形的每个周期保持不变且以储能电感L1另一端电压为中心进行谐振的特点，不直接进行波峰或波谷检测，波峰波谷开通控制器在同步整流电路最高开关频率限制结束时刻通过比较器对储能电感L1两端电压进行比较，在比较器输出信号的上升或下降沿时刻使能定时器，定时器的定时时间叠加波峰波谷开通控制器的采样，比较，逻辑处理和驱动等所有延时为
Figure PCTCN2022117716-appb-000001
(n为大于等于零的整数，T为谐振周期)，定时器的定时时间可通过波峰波谷开通控制器的外部引脚进行设定，也可采用数字电路形式烧录到控制IC内部。在定时器定时结束时可在储能电感L1一端的电压Vs谐振的波峰或波谷处开通主开关管或同步整流管，实现开关管的软开通。 After the energy storage inductor L1 of the synchronous rectification circuit is demagnetized, the energy storage inductor L1 and the parasitic capacitance Coss1 of the switch tube Q1 and the parasitic capacitor Coss2 of the switch tube Q2 start to resonate, because the voltage Vs at one end of the energy storage inductor L1 has a high resonance frequency And there is damping attenuation, it is difficult to realize the peak or trough detection and turn on the switch tube at the peak or trough. The present invention uses the voltage Vs at one end of the energy storage inductor L1 to keep each cycle of the resonant waveform unchanged and the voltage at the other end of the energy storage inductor L1 The characteristic of resonating as the center does not directly detect the peak or valley. The peak and valley opening controller compares the voltage at both ends of the energy storage inductor L1 through the comparator at the end of the maximum switching frequency limit of the synchronous rectification circuit, and the output signal of the comparator The timer is enabled at the time of the rising or falling edge, and the timing time of the timer is superimposed on the peak and valley to open the sampling, comparison, logic processing and driving of the controller. All delays are
Figure PCTCN2022117716-appb-000001
(n is an integer greater than or equal to zero, and T is the resonance period). The timing of the timer can be set through the external pins of the peak and valley opening controller, or it can be programmed into the control IC in the form of a digital circuit. At the end of the timer timing, the main switching tube or the synchronous rectifying tube can be turned on at the peak or valley of the resonance voltage Vs at one end of the energy storage inductor L1, so as to realize the soft turning on of the switching tube.
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings.
第一实施例first embodiment
本实施例的同步整流电路工作在降压状态，主开关管为开关管Q1，同步整流管为开关管Q2，本实施例中，当输入电压Vin、输出电压Vo和阈值电压Vth 满足关系式：Vin-Vth<＝2*Vo时，当同步整流电路的储能电感L1完成去磁后，波峰波谷开通控制器在Vs谐振的波峰处开通主开关管Q1；当输入电压Vin、输出电压Vo和阈值电压Vth满足关系式：Vin-Vth>2*Vo时，当同步整流电路的储能电感L1完成去磁后，波峰波谷开通控制器在Vs谐振的波谷处开通同步整流管Q2；阈值电压Vth的值大于等于零伏特。The synchronous rectification circuit of this embodiment works in a step-down state, the main switching tube is the switching tube Q1, and the synchronous rectifying tube is the switching tube Q2. In this embodiment, when the input voltage Vin, the output voltage Vo and the threshold voltage Vth satisfy the relational expression: When Vin-Vth<=2*Vo, when the energy storage inductor L1 of the synchronous rectification circuit is demagnetized, the peak-to-valley turn-on controller turns on the main switch Q1 at the peak of Vs resonance; when the input voltage Vin, output voltage Vo and The threshold voltage Vth satisfies the relational expression: when Vin-Vth>2*Vo, when the energy storage inductance L1 of the synchronous rectification circuit is demagnetized, the peak-to-valley turn-on controller turns on the synchronous rectifier tube Q2 at the valley of Vs resonance; the threshold voltage Vth is greater than or equal to zero volts.
图3为本发明第一实施例涉及的同步整流电路工作在波峰开通模式的时序图，请参考图3，图3中的Timer为一限频定时器的输出波形，用来限制同步整流电路的最高开关频率，主开关管Q1导通时刻限频定时器Timer使能。V gs1为主开关管Q1的栅极的控制信号波形，V gs2为同步整流管Q2的栅极的控制信号波形，i L1为流经储能电感L1的电流波形，V S为储能电感L1一端Vs的电压波形。 Fig. 3 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the first embodiment of the present invention, please refer to Fig. 3, the Timer in Fig. 3 is the output waveform of a frequency-limiting timer, which is used to limit the synchronous rectification circuit The highest switching frequency, the frequency-limiting timer Timer is enabled when the main switching tube Q1 is turned on. V gs1 is the control signal waveform of the gate of the main switching transistor Q1, V gs2 is the control signal waveform of the gate of the synchronous rectifier Q2, i L1 is the current waveform flowing through the energy storage inductance L1, and V S is the energy storage inductance L1 The voltage waveform at one terminal Vs.
Vin的电压范围为18V～75V，以Vin电压为30V，Vo电压为12V，阈值电压Vth为10V为例进行说明，称为工作状态1，储能电感L1在t3时刻去磁结束时关断同步整流管Q2，储能电感L1与寄生电容Coss1和寄生电容Coss2以输出电压Vo为中心谐振，理论上谐振的最低电压为0V，最高电压为2*Vo，由于该工况下Vin-Vth<＝2*Vo，所以储能电感L1一端Vs的谐振最高电压2*Vo大于Vin-Vth，从软开关实现的广义定义：当储能电感L1一端Vs的谐振最高电压达到Vin或比Vin低一个较小的阈值电压Vth(Vth大于等于0V)时开通主开关管Q1，可认为主开关管Q1实现了软开通。The voltage range of Vin is 18V to 75V. The Vin voltage is 30V, the Vo voltage is 12V, and the threshold voltage Vth is 10V. This is called the working state 1. The energy storage inductor L1 is turned off synchronously at the end of demagnetization at time t3. Rectifier tube Q2, energy storage inductor L1, and parasitic capacitance Coss1 and parasitic capacitance Coss2 resonate around the output voltage Vo. Theoretically, the lowest voltage of resonance is 0V, and the highest voltage is 2*Vo. Since Vin-Vth<= under this working condition 2*Vo, so the highest resonant voltage 2*Vo at one end Vs of the energy storage inductor L1 is greater than Vin-Vth, from the broad definition of soft switching: when the highest resonant voltage at the end Vs of the energy storage inductor L1 reaches Vin or is lower than Vin When the threshold voltage Vth is small (Vth is greater than or equal to 0V), the main switching transistor Q1 is turned on, and it can be considered that the main switching transistor Q1 is softly turned on.
图3所示为同步整流电路在工作状态1、从t 0至t 0+T一个工作周期T内的具体工作过程，如下： Figure 3 shows the specific working process of the synchronous rectification circuit in working state 1, from t 0 to t 0 +T within a working cycle T, as follows:
t0～t1阶段：也称为励磁阶段，t0时刻主开关管Q1导通，限频定时器Timer开始定时，储能电感L1两端的电压等于输入电压Vin减去输出电压Vo，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000002
上升。 t0~t1 stage: also known as the excitation stage, the main switch Q1 is turned on at t0, the frequency limit timer Timer starts timing, the voltage across the energy storage inductor L1 is equal to the input voltage Vin minus the output voltage Vo, the energy storage inductor L1 Current i L1 with slope
Figure PCTCN2022117716-appb-000002
rise.
t1～t2阶段：t1时刻关断主开关管Q1，储能电感L1的电流i L1给主开关管Q1的寄生电容Coss1充电，给同步整流管Q2的寄生电容Coss2放电，储能电感L1一端Vs的电压从等于输入电压Vin下降为0V，在t2时刻同步整流管Q2实现ZVS开通。 Stage t1～t2: turn off the main switching tube Q1 at time t1, the current i L1 of the energy storage inductor L1 charges the parasitic capacitor Coss1 of the main switching tube Q1, discharges the parasitic capacitor Coss2 of the synchronous rectifier tube Q2, and one end of the energy storage inductor L1 Vs The voltage of V drops from equal to the input voltage Vin to 0V, and the synchronous rectifier Q2 realizes ZVS opening at time t2.
t2～t3阶段：也称为去磁阶段，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000003
下降，储 能电感L1的电流i L1在t3时刻降为零，去磁结束，此刻关断同步整流管Q2，去磁结束时刻t3早于限频定时器timer结束时刻t`。 t2～t3 stage: also known as the demagnetization stage, the current i L1 of the energy storage inductor L1 with a slope
Figure PCTCN2022117716-appb-000003
The current i L1 of the energy storage inductor L1 drops to zero at time t3, and the demagnetization ends. At this moment, the synchronous rectifier Q2 is turned off, and the demagnetization end time t3 is earlier than the frequency limit timer timer end time t`.
t3～t0+T阶段：也称为谐振阶段，为了更加详细的描述谐振阶段，按照时间轴对此阶段放大得到图4，请参考图4，从t3时刻开始，储能电感L1一端Vs的电压开始谐振，图5为本发明波峰波谷开通控制器的第一种内部电路原理图，请参考图5，从限频定时器Timer定时结束时刻t`开始，比较储能电感L1两端的电压，在f时刻Vs电压开始从大于Vo变为小于Vo，比较器的输出电压开始翻转，在比较器输出信号的上升沿时刻使能第一定时器，图5中第一定时器在t0+T时刻结束定时并在Vs谐振的波峰处开通主开关管Q1，实现主开关管Q1的软开通，图5中的定时器使能选择模块根据公式Vin-Vth<＝2*Vo决定了比较器输出信号的上升沿时刻只能使能第一定时器，从f时刻到t0+T时刻可以是图4中的
Figure PCTCN2022117716-appb-000004
也可以是
Figure PCTCN2022117716-appb-000005
或
Figure PCTCN2022117716-appb-000006
等。 t3～t0+T stage: also known as the resonance stage. In order to describe the resonance stage in more detail, this stage is enlarged according to the time axis to obtain Figure 4. Please refer to Figure 4. From the time t3, the voltage at one end Vs of the energy storage inductor L1 Start to resonate, and Fig. 5 is the first internal circuit schematic diagram of the peak and valley opening controller of the present invention, please refer to Fig. 5, start from the timing end time t` of the frequency-limiting timer Timer, compare the voltage at both ends of the energy storage inductance L1, at At time f, the Vs voltage starts to change from greater than Vo to less than Vo, the output voltage of the comparator starts to reverse, and the first timer is enabled at the rising edge of the comparator output signal, and the first timer ends at time t0+T in Figure 5 Timely and turn on the main switch Q1 at the peak of Vs resonance to realize the soft turn-on of the main switch Q1. The timer enable selection module in Figure 5 determines the output signal of the comparator according to the formula Vin-Vth<=2*Vo Only the first timer can be enabled at the rising edge time, from time f to t0+T time can be as shown in Figure 4
Figure PCTCN2022117716-appb-000004
can also be
Figure PCTCN2022117716-appb-000005
or
Figure PCTCN2022117716-appb-000006
wait.
本周期结束，下一个工作周期开始，重复上面的阶段。At the end of this cycle, the next working cycle begins, and the above stages are repeated.
上述工作状态1的其它条件不变，仅以Vin电压上升到60V为例进行说明，称为工作状态2，图5中的定时器使能选择模块根据该工况下Vin-Vth>2*Vo，决定了比较器输出信号的上升沿时刻只能使能第二定时器，在Vs谐振的波谷处开通同步整流管Q2，实现同步整流管Q2的软开通。The other conditions of the above working state 1 remain unchanged, and only the Vin voltage rises to 60V as an example for illustration, which is called working state 2. The timer enable selection module in Figure 5 is based on Vin-Vth>2*Vo in this working condition , it is determined that only the second timer can be enabled at the rising edge of the comparator output signal, and the synchronous rectifier Q2 is turned on at the valley of Vs resonance, so as to realize the soft turn-on of the synchronous rectifier Q2.
图6为本发明第一实施例涉及的同步整流电路工作在波谷开通模式的时序图，请参考图6，图6所示为工作状态2在一个工作周期T内的具体工作过程，如下：FIG. 6 is a timing diagram of the synchronous rectification circuit working in the valley opening mode according to the first embodiment of the present invention. Please refer to FIG. 6. FIG. 6 shows the specific working process of the working state 2 in a working cycle T, as follows:
t0～t3阶段与工作状态1的工作过程相同。The t0～t3 stage is the same as the working process of the working state 1.
t3～t4阶段：也称为谐振阶段，从t3时刻开始，储能电感L1一端Vs的电压开始谐振，请参考图5，从限频定时器Timer定时结束时刻t`开始比较储能电感L1两端的电压，在f时刻Vs电压开始从大于Vo变为小于Vo，图5中比较器的输出电压开始翻转，在比较器输出信号的上升沿时刻使能第二定时器，第二定时器在t4时刻结束定时，在Vs谐振的波谷处开通同步整流管Q2，实现同步整流管Q2的软开通，从f时刻到t4时刻可以是图6中的
Figure PCTCN2022117716-appb-000007
也可以是
Figure PCTCN2022117716-appb-000008
Figure PCTCN2022117716-appb-000009
或
Figure PCTCN2022117716-appb-000010
等。 t3~t4 stage: also called the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, please refer to Figure 5, and compare the two voltages of the energy storage inductor L1 from the end time t` of the frequency limit timer Timer At time f, the Vs voltage starts to change from greater than Vo to less than Vo, the output voltage of the comparator in Figure 5 begins to reverse, and the second timer is enabled at the rising edge of the comparator output signal, and the second timer is at t4 At the end of the timing, the synchronous rectifier Q2 is turned on at the trough of Vs resonance to realize the soft turn-on of the synchronous rectifier Q2. From time f to time t4, it can be as shown in Figure 6
Figure PCTCN2022117716-appb-000007
can also be
Figure PCTCN2022117716-appb-000008
Figure PCTCN2022117716-appb-000009
or
Figure PCTCN2022117716-appb-000010
wait.
t4～t5阶段：也称为反向阶段，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000011
从零下降为负电流，在t5时刻关断同步整流管Q2。 t4～t5 stage: also known as the reverse stage, the current i L1 of the energy storage inductor L1 is at a slope
Figure PCTCN2022117716-appb-000011
The current drops from zero to negative, and the synchronous rectifier Q2 is turned off at time t5.
t5～t0+T阶段：输出电压Vo通过储能电感L1给主开关管Q1的寄生电容Coss1放电，给同步开关管Q2的寄生电容Coss2充电，储能电感L1一端Vs的电压在t0+T时刻大于Vin-Vth，实现主开关管Q1的ZVS开通。t5～t0+T stage: the output voltage Vo discharges the parasitic capacitor Coss1 of the main switching tube Q1 through the energy storage inductor L1, and charges the parasitic capacitor Coss2 of the synchronous switching tube Q2, and the voltage at one end Vs of the energy storage inductor L1 is at the time t0+T greater than Vin-Vth, the ZVS of the main switch Q1 is turned on.
本周期结束，下一个工作周期开始，重复上面的阶段。At the end of this cycle, the next working cycle begins, and the above stages are repeated.
波峰波谷开通控制器的内部电路原理图除了图5的连接形式，还有图7～图10的连接形式，它们的比较器正负输入端的连接关系可以交换，比较器输出信号上升沿使能和下降沿使能可以交换，只需控制逻辑稍作修改即可，由于波峰波谷开通控制器的内部电路原理图连接关系和逻辑关系的排列组合非常多，在本发明的实施例中就不一一说明，接下来仅对图7～图10作简单区别说明：In addition to the connection form in Figure 5, the internal circuit schematic diagram of the peak-to-valley opening controller also has the connection forms in Figure 7 to Figure 10. The connection relationship between the positive and negative input terminals of their comparators can be exchanged, and the rising edge of the comparator output signal enables and The falling edge enable can be exchanged, and only a slight modification of the control logic is required. Since there are many connection relationships and logical relationships in the internal circuit schematic diagram of the peak and valley opening controller, there are many permutations and combinations in the embodiment of the present invention. Explanation, the following is only a brief description of the differences between Figures 7 to 10:
图5中的第一定时器和第二定时器采用相同的比较器输出使能信号，图7中的第一定时器和第二定时器采用相反的比较器输出使能信号，图8中的第一定时器和第二定时器采用各自独立的比较器输出使能信号，图9和图10只能实现主开关管Q1或同步整流管Q2的波峰或波谷软开通。The first timer and the second timer in Fig. 5 adopt the same comparator output enable signal, the first timer in Fig. 7 and the second timer adopt the opposite comparator output enable signal, and the comparator in Fig. 8 The first timer and the second timer use independent comparators to output enable signals, and Fig. 9 and Fig. 10 can only realize the peak or trough soft turn-on of the main switch Q1 or the synchronous rectifier Q2.
第二实施例second embodiment
本实施例的同步整流电路工作在升压状态，主开关管为开关管Q2，同步整流管为开关管Q1，下面主要针对不同于第一实施例的内容进行描述。The synchronous rectification circuit of this embodiment works in a boost state, the main switching tube is the switching tube Q2, and the synchronous rectifying tube is the switching tube Q1. The following description mainly focuses on the content different from the first embodiment.
本实施例中，当输入电压Vin、输出电压Vo和阈值电压Vth满足关系式：2*Vin-Vth<＝Vo时，称为工作状态3，当同步整流电路的储能电感L1完成去磁后，波峰波谷开通控制器在Vs谐振的波谷处开通主开关管Q2；当输入电压Vin、输出电压Vo和阈值电压Vth满足关系式：2*Vin-Vth>Vo时，称为工作状态4，当同步整流电路的储能电感L1完成去磁后，波峰波谷开通控制器在Vs谐振的波峰处开通同步整流管Q1；阈值电压Vth的值大于等于零伏特。In this embodiment, when the input voltage Vin, output voltage Vo and threshold voltage Vth satisfy the relational formula: 2*Vin-Vth<=Vo, it is called working state 3, when the energy storage inductor L1 of the synchronous rectification circuit is demagnetized , the peak-to-valley turn-on controller turns on the main switch Q2 at the trough of Vs resonance; when the input voltage Vin, output voltage Vo and threshold voltage Vth satisfy the relationship: 2*Vin-Vth>Vo, it is called working state 4, when After the energy storage inductance L1 of the synchronous rectification circuit is demagnetized, the peak-to-valley turn-on controller turns on the synchronous rectifier tube Q1 at the peak of Vs resonance; the threshold voltage Vth is greater than or equal to zero volts.
图11为本发明第二实施例涉及的同步整流电路工作在波谷开通模式的时序图，请参考图11，图11所示为同步整流电路工作在升压且2*Vin-Vth<＝Vo时，从t 0至t 0+T一个工作周期T内的具体工作过程，如下： Fig. 11 is a timing diagram of the synchronous rectification circuit working in the valley turn-on mode according to the second embodiment of the present invention, please refer to Fig. 11, Fig. 11 shows that the synchronous rectification circuit is working in boost and 2*Vin-Vth<=Vo , the specific working process within a working cycle T from t 0 to t 0 +T is as follows:
t0～t1阶段：也称为励磁阶段，t0时刻主开关管Q2导通，限频定时器Timer开始定时，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000012
上升。 t0~t1 stage: also known as the excitation stage, the main switch Q2 is turned on at t0, the frequency limit timer Timer starts timing, and the current i L1 of the energy storage inductor L1 follows the slope
Figure PCTCN2022117716-appb-000012
rise.
t1～t2阶段：t1时刻关断主开关管Q2，储能电感L1的电流i L1给主开关管Q2的寄生电容Coss2充电，给同步整流管Q1的寄生电容Coss1放电，储能电感L1一端Vs的电压从0V上升到输出电压Vo，在t2时刻同步整流管Q1实现ZVS开通。 Stage t1～t2: turn off the main switching tube Q2 at time t1, the current i L1 of the energy storage inductor L1 charges the parasitic capacitor Coss2 of the main switching tube Q2, discharges the parasitic capacitor Coss1 of the synchronous rectifier tube Q1, and one end of the energy storage inductor L1 Vs The voltage rises from 0V to the output voltage Vo, and the synchronous rectifier Q1 realizes the ZVS opening at time t2.
t2～t3阶段：也称为去磁阶段，储能电感L1两端的电压等于输出电压Vo减去输入电压Vin，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000013
下降，储能电感L1的电流i L1在t3时刻降为零，去磁结束，此刻关断同步整流管Q1，去磁结束时刻t3早于限频定时器timer结束时刻t`。 t2~t3 stage: also known as the demagnetization stage, the voltage across the energy storage inductor L1 is equal to the output voltage Vo minus the input voltage Vin, and the current i L1 of the energy storage inductor L1 is proportional to the slope
Figure PCTCN2022117716-appb-000013
The current i L1 of the energy storage inductor L1 drops to zero at time t3, and the demagnetization ends. At this moment, the synchronous rectifier Q1 is turned off, and the demagnetization end time t3 is earlier than the frequency limit timer timer end time t`.
t3～t0+T阶段：也称为谐振阶段，从t3时刻开始，储能电感L1一端Vs的电压开始谐振，波峰波谷开通控制器的内部电路原理图可以是图5，图7，图8，图9的任何一种，现以图5为例进行说明，请参考图5，从限频定时器Timer定时结束时刻t`开始比较储能电感L1两端的电压，在f时刻Vs电压开始从大于Vin变为小于Vin，比较器的输出电压开始翻转，在比较器输出信号的上升沿时刻使能第一定时器，图5中第一定时器在t0+T时刻结束定时并在Vs谐振的波谷处开通主开关管Q2，实现主开关管Q2的软开通，图5中的定时器使能选择模块根据公式2*Vin-Vth<＝Vo决定了比较器输出信号的上升沿时刻只能使能第一定时器。t3～t0+T stage: also known as the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, and the internal circuit schematic diagram of the peak and valley opening controller can be as shown in Figure 5, Figure 7, Figure 8, Any one of Fig. 9 is now illustrated by taking Fig. 5 as an example. Please refer to Fig. 5. From the end time t` of the frequency-limiting timer Timer, the voltage at both ends of the energy storage inductance L1 is compared, and the Vs voltage starts from greater than Vin becomes smaller than Vin, the output voltage of the comparator starts to flip, and the first timer is enabled at the rising edge of the comparator output signal. In Figure 5, the first timer ends timing at time t0+T and at the valley of Vs resonance Turn on the main switching tube Q2 to realize the soft opening of the main switching tube Q2. The timer enable selection module in Figure 5 determines that the rising edge of the comparator output signal can only be enabled according to the formula 2*Vin-Vth<=Vo First timer.
本周期结束，下一个工作周期开始，重复上面的阶段。At the end of this cycle, the next working cycle begins, and the above stages are repeated.
图2所示为同步整流电路工作在升压且Vin-Vth>2*Vo时，对应工作状态4，图5中的定时器使能选择模块根据关系式Vin-Vth>2*Vo决定了比较器输出信号的上升沿时刻只能使能第二定时器，在Vs谐振的波峰处开通同步整流管Q2，实现同步整流管Q2的软开通。Figure 2 shows that when the synchronous rectification circuit works in boost and Vin-Vth>2*Vo, corresponding to working state 4, the timer enable selection module in Figure 5 determines the comparison according to the relationship Vin-Vth>2*Vo Only the second timer can be enabled at the rising edge of the output signal of the device, and the synchronous rectifier Q2 is turned on at the peak of Vs resonance, so as to realize the soft turn-on of the synchronous rectifier Q2.
图12为本发明第二实施例涉及的同步整流电路工作在波峰开通模式的时序图，请参考图12，图12所示为工作状态4在一个工作周期T内的具体工作过程，如下：Fig. 12 is a timing diagram of the synchronous rectification circuit working in the peak-on mode according to the second embodiment of the present invention. Please refer to Fig. 12. Fig. 12 shows the specific working process of the working state 4 in a working cycle T, as follows:
t0～t3阶段与工作状态3的t0～t3阶段工作过程相同。The t0-t3 stage is the same as the t0-t3 stage of the working state 3.
t3～t4阶段：也称为谐振阶段，从t3时刻开始，储能电感L1一端Vs的电压开始谐振，波峰波谷开通控制器的内部电路原理图可以是图5，图7，图8， 图10的任何一种，现以图5为例进行说明，请参考图5，从限频定时器Timer定时结束时刻t`开始比较储能电感L1两端的电压，在e时刻Vs电压开始从小于Vin变为大于Vin，图5中比较器的输出电压开始翻转产生下降沿信号，但是图5中描述的定时器只识别上升沿，因此定时器不动作，在f时刻Vs电压开始从大于Vin变为小于Vin，图5中比较器的输出电压开始翻转，在比较器输出信号的上升沿时刻使能第二定时器，第二定时器在t4时刻结束定时，在Vs谐振的波峰处开通同步整流管Q1，实现同步整流管Q1的软开通。t3~t4 stage: also known as the resonance stage, starting from t3, the voltage at one end Vs of the energy storage inductor L1 starts to resonate, and the internal circuit schematic diagram of the peak and valley opening controller can be as shown in Figure 5, Figure 7, Figure 8, and Figure 10 Any one of the two methods is illustrated by taking Figure 5 as an example. Please refer to Figure 5. From the end time t` of the frequency-limiting timer Timer, the voltage at both ends of the energy storage inductor L1 is compared. At time e, the Vs voltage changes from less than Vin to If it is greater than Vin, the output voltage of the comparator in Figure 5 starts to reverse to generate a falling edge signal, but the timer described in Figure 5 only recognizes the rising edge, so the timer does not act, and the Vs voltage starts to change from greater than Vin to less than Vin, the output voltage of the comparator in Figure 5 starts to reverse, the second timer is enabled at the rising edge of the comparator output signal, the second timer ends timing at t4, and the synchronous rectifier Q1 is turned on at the peak of Vs resonance , to realize the soft opening of the synchronous rectifier Q1.
t4～t5阶段：也称为反向阶段，储能电感L1的电流i L1以斜率
Figure PCTCN2022117716-appb-000014
从零下降为负电流，在t5时刻关断同步整流管Q1。 t4～t5 stage: also known as the reverse stage, the current i L1 of the energy storage inductor L1 is at a slope
Figure PCTCN2022117716-appb-000014
The current drops from zero to negative, and the synchronous rectifier tube Q1 is turned off at time t5.
t5～t0+T阶段：储能电感L1给主开关管Q2的寄生电容Coss2放电，给同步开关管Q1的寄生电容Coss1充电，储能电感L1一端Vs的电压在t0+T时刻小于Vth，实现主开关管Q2的ZVS开通。t5～t0+T stage: the energy storage inductor L1 discharges the parasitic capacitor Coss2 of the main switching tube Q2, charges the parasitic capacitor Coss1 of the synchronous switching tube Q1, and the voltage at one end Vs of the energy storage inductor L1 is less than Vth at the time t0+T, realizing The ZVS of the main switching tube Q2 is turned on.
本周期结束，下一个工作周期开始，重复上面的阶段。At the end of this cycle, the next working cycle begins, and the above stages are repeated.
需要说明的是，本发明的也适用于二极管整流电路，即将图2中的同步整流管替换为二极管，此时只有主开关管需要控制，控制器相应的电路结构可以删除，也可以不用删除，而将相关引脚悬空、拉高或拉低等，具体的控制过程和控制器内部的结构可以通过第一实施例和第二实施例推知，在此不赘述。It should be noted that the present invention is also applicable to the diode rectifier circuit, that is, the synchronous rectifier in Fig. 2 is replaced with a diode. At this time, only the main switching tube needs to be controlled, and the corresponding circuit structure of the controller can be deleted or not. However, the specific control process and internal structure of the controller can be deduced from the first embodiment and the second embodiment by suspending relevant pins, pulling them high or low, and will not be repeated here.
上述实施方式不应视为对本发明的限制，本发明的保护范围应当以权利要求所限定的范围为准。对于本技术领域的普通技术人员来说，在不脱离本发明的精神和范围内，还可以做出若干等同替换、改进和润饰，再如根据应用场合的不同，通过器件的简单串并联等手段对电路微调，这些改进和润饰也应视为本发明的保护范围。The above embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be determined by the scope defined in the claims. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, some equivalent replacements, improvements and modifications can also be made, and according to different applications, simple series-parallel connection of devices and other means For circuit fine-tuning, these improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (22)

  1. 一种波峰波谷开通控制方法，应用于同步整流电路，所述的同步整流电路包括主开关管、同步整流管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下步骤：A method for controlling opening of peaks and valleys, applied to a synchronous rectification circuit, wherein the synchronous rectification circuit includes a main switching tube, a synchronous rectification tube, and an energy storage inductor, characterized in that the method for controlling opening of peaks and valleys includes the following steps:
    获得同步整流电路的最高开关频率限制结束时刻；Obtain the end time of the maximum switching frequency limit of the synchronous rectification circuit;
    在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；Comparing the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
    根据所述的同步整流电路的工作状态，以及预定的条件，选择执行如下动作之一：According to the working state of the synchronous rectification circuit and the predetermined conditions, choose to perform one of the following actions:
    在所述的比较结果信号翻转时刻开始计时，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通；Start counting when the signal of the comparison result is reversed, and control the main switch to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the first predetermined time is over;
    在所述的比较结果信号翻转时刻开始计时，在第二预定时间结束后，控制所述的同步整流管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。Start counting when the signal of the comparison result is reversed, and control the synchronous rectifier to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the second predetermined time is over.
  2. 根据权利要求1所述的波峰波谷开通控制方法，其特征在于：通过限频定时器获得同步整流电路的最高开关频率限制结束时刻。The peak-to-valley opening control method according to claim 1, characterized in that: the end time of the maximum switching frequency limit of the synchronous rectification circuit is obtained by the frequency limit timer.
  3. 根据权利要求1所述的波峰波谷开通控制方法，其特征在于：通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号。The peak-to-valley opening control method according to claim 1, characterized in that: the voltage at both ends of the energy storage inductor is compared by a comparator to obtain the comparison result signal.
  4. 根据权利要求1所述的波峰波谷开通控制方法，其特征在于：通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The method for controlling opening of peaks and valleys according to claim 1, characterized in that: the first predetermined time is obtained by a first timer, and the first timer is enabled by the rising edge of the comparison result signal Or enabled by the falling edge of the comparison result signal.
  5. 根据权利要求1所述的波峰波谷开通控制方法，其特征在于：通过第二定时器获得所述的第二预定时间，所述的第二定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The method for controlling opening of peaks and valleys according to claim 1, characterized in that: the second predetermined time is obtained by a second timer, and the second timer is enabled by the rising edge of the comparison result signal Or enabled by the falling edge of the comparison result signal.
  6. 根据权利要求1至5任一项所述的波峰波谷开通控制方法，其特征在于：所述的同步整流电路的工作状态为降压时，所述的预定条件为：According to the control method for opening peaks and valleys according to any one of claims 1 to 5, it is characterized in that: when the working state of the synchronous rectification circuit is step-down, the predetermined condition is:
    当Vin-Vth<＝2*Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, select the main switching tube to be turned on at the peak of the connection node between the main switching tube and the synchronous rectifier tube after the end of the first predetermined time;
    当Vin-Vth>2*Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When Vin-Vth>2*Vo, select the synchronous rectifier to be turned on at the trough of the connection node between the main switch and the synchronous rectifier after the second predetermined time;
    其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
  7. 根据权利要求1至5任一项所述的波峰波谷开通控制方法，其特征在于：所述的同步整流电路的工作状态为升压时，所述的预定条件为：According to the control method for opening peaks and valleys according to any one of claims 1 to 5, it is characterized in that: when the working state of the synchronous rectification circuit is boosting, the predetermined condition is:
    当2*Vin-Vth<＝Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, select the main switching tube to be turned on at the trough of the connecting node between the main switching tube and the synchronous rectifier after the first predetermined time;
    当2*Vin-Vth>Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When 2*Vin-Vth>Vo, select the synchronous rectifier to be turned on at the peak of the connection node between the main switch and the synchronous rectifier after the second predetermined time ends;
    其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
  8. 一种波峰波谷开通控制方法，应用于二极管整流电路，所述的二极管整流电路包括主开关管、整流二级管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下步骤：A peak and valley opening control method, applied to a diode rectifier circuit, the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, characterized in that the peak and valley opening control method includes the following steps :
    获得所述的二极管整流电路的最高开关频率限制结束时刻；obtaining the end time of the maximum switching frequency limit of the diode rectifier circuit;
    在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；Comparing the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
    在所述的比较结果信号翻转时刻开始计时，根据所述的二极管整流电路的工作状态，以及预定的条件，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰处开通。Start counting at the moment when the signal of the comparison result is reversed, and according to the working state of the diode rectifier circuit and predetermined conditions, after the first predetermined time, control the main switching tube in the main switching tube The crest of the node connected to the synchronous rectifier is opened.
  9. 根据权利要求8所述的波峰波谷开通控制方法，其特征在于：通过限频定时器获得所述的二极管整流电路的最高开关频率限制结束时刻；通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号；通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The peak and valley opening control method according to claim 8, characterized in that: the maximum switching frequency limit end time of the diode rectifier circuit is obtained by a frequency limit timer; the voltage at both ends of the energy storage inductor is checked by a comparator Perform a comparison to obtain the comparison result signal; obtain the first predetermined time through the first timer, and the first timer is enabled by the rising edge of the comparison result signal or by the comparison The falling edge of the resulting signal is enabled.
  10. 根据权利要求8至9任一项所述的波峰波谷开通控制方法，其特征在于：所述的二极管整流电路的工作状态为降压时，所述的预定条件为：According to the control method for opening peaks and valleys according to any one of claims 8 to 9, it is characterized in that: when the working state of the diode rectifier circuit is step-down, the predetermined condition is:
    当Vin-Vth<＝2*Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, the main switch is turned on at the peak of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
    其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
  11. 根据权利要求8至9任一项所述的波峰波谷开通控制方法，其特征在于：所述的二极管整流电路的工作状态为升压时，所述的预定条件为：According to the control method for opening peaks and valleys according to any one of claims 8 to 9, it is characterized in that: when the working state of the diode rectifier circuit is boosting, the predetermined condition is:
    当2*Vin-Vth<＝Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, the main switch is turned on at the valley of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
    其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
  12. 一种波峰波谷开通控制器，应用于同步整流电路，所述的同步整流电路包括主开关管、同步整流管和储能电感，其特征在于，所述的波峰波谷开通控制方法，包括如下单元：A peak and valley opening controller is applied to a synchronous rectification circuit, and the synchronous rectification circuit includes a main switch tube, a synchronous rectification tube and an energy storage inductor, and is characterized in that the peak and valley opening control method includes the following units:
    触发单元，获得同步整流电路的最高开关频率限制结束时刻；The trigger unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit;
    比较单元，用于在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；A comparing unit, configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
    执行单元，用于根据所述的同步整流电路的工作状态，以及预定的条件，选择执行如下动作之一：The execution unit is used to select and execute one of the following actions according to the working state of the synchronous rectification circuit and predetermined conditions:
    在所述的比较结果信号翻转时刻开始计时，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通；Start counting when the signal of the comparison result is reversed, and control the main switch to be turned on at the peak or valley of the node connecting the main switch and the synchronous rectifier after the first predetermined time is over;
    在所述的比较结果信号翻转时刻开始计时，在第二预定时间结束后，控制所述的同步整流管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。Start counting when the signal of the comparison result is reversed, and control the synchronous rectifier to be turned on at the peak or valley of the connection node between the main switch and the synchronous rectifier after the second predetermined time is over.
  13. 根据权利要求12所述的波峰波谷开通控制器，其特征在于：所述的触发单元通过限频定时器获得同步整流电路的最高开关频率限制结束时刻。The peak-to-valley turn-on controller according to claim 12, wherein the trigger unit obtains the end time of the maximum switching frequency limit of the synchronous rectification circuit through the frequency limit timer.
  14. 根据权利要求12所述的波峰波谷开通控制器，其特征在于：所述的比较单元通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号。The peak-to-valley opening controller according to claim 12, wherein the comparison unit compares the voltages at both ends of the energy storage inductor through a comparator to obtain the comparison result signal.
  15. 根据权利要求12所述的波峰波谷开通控制器，其特征在于：所述的执行单元通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The peak and valley opening controller according to claim 12, characterized in that: the execution unit obtains the first predetermined time through a first timer, and the first timer is determined by the comparison result signal The rising edge of the signal is enabled or the falling edge of the comparison result signal is enabled.
  16. 根据权利要求12所述的波峰波谷开通控制器，其特征在于：所述的执行单元通过第二定时器获得所述的第二预定时间，所述的第二定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The peak and valley opening controller according to claim 12, characterized in that: the execution unit obtains the second predetermined time through a second timer, and the second timer is determined by the comparison result signal The rising edge of the signal is enabled or the falling edge of the comparison result signal is enabled.
  17. 根据权利要求12至15所述的波峰波谷开通控制器，其特征在于：所述的同步整流电路的工作状态为降压时，所述的预定条件为：According to the peak-wave opening controller according to claims 12 to 15, it is characterized in that: when the working state of the synchronous rectification circuit is step-down, the predetermined condition is:
    当Vin-Vth<＝2*Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, select the main switching tube to be turned on at the peak of the connection node between the main switching tube and the synchronous rectifier tube after the end of the first predetermined time;
    当Vin-Vth>2*Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When Vin-Vth>2*Vo, select the synchronous rectifier to be turned on at the trough of the connection node between the main switch and the synchronous rectifier after the second predetermined time;
    其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
  18. 根据权利要求12至15任一项所述的波峰波谷开通控制器，其特征在于：所述的同步整流电路的工作状态为升压时，所述的预定条件为：The peak-to-valley opening controller according to any one of claims 12 to 15, characterized in that: when the working state of the synchronous rectification circuit is boosting, the predetermined condition is:
    当2*Vin-Vth<＝Vo时，选择所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, select the main switching tube to be turned on at the trough of the connecting node between the main switching tube and the synchronous rectifier after the first predetermined time;
    当2*Vin-Vth>Vo时，选择所述的同步整流管在所述的第二预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When 2*Vin-Vth>Vo, select the synchronous rectifier to be turned on at the peak of the connection node between the main switch and the synchronous rectifier after the second predetermined time ends;
    其中Vin为所述的同步整流电路的输入电压、Vo为所述的同步整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the synchronous rectification circuit, Vo is the output voltage of the synchronous rectification circuit, and Vth is a set voltage greater than or equal to 0V.
  19. 一种波峰波谷开通控制器，应用于二极管整流电路，所述的二极管整流电路包括主开关管、整流二级管和储能电感，其特征在于，所述的波峰波谷开通控制器，包括如下单元：A peak and valley opening controller is applied to a diode rectifier circuit, and the diode rectification circuit includes a main switch tube, a rectifier diode and an energy storage inductor, and is characterized in that the peak and valley opening controller includes the following units :
    触发单元，用于获得所述的二极管整流电路的最高开关频率限制结束时刻；A trigger unit, configured to obtain the end time of the maximum switching frequency limit of the diode rectifier circuit;
    比较单元，用于在所述的结束时刻对所述的储能电感两端的电压进行比较，获得比较结果信号；A comparing unit, configured to compare the voltages at both ends of the energy storage inductor at the end moment to obtain a comparison result signal;
    执行单元，在所述的比较结果信号翻转时刻开始计时，根据所述的二极管整流电路的工作状态，以及预定的条件，在第一预定时间结束后，控制所述的主开关管在所述的主开关管与所述的同步整流管连接节点的波峰或波谷处开通。The execution unit starts counting at the moment when the signal of the comparison result is inverted, and controls the main switching tube at the The peak or trough of the connection node between the main switch tube and the synchronous rectifier tube is turned on.
  20. 根据权利要求19所述的波峰波谷开通控制器，其特征在于：所述的触发单元通过限频定时器获得所述的二极管整流电路的最高开关频率限制结束时刻；所述的比较单元通过比较器对所述的储能电感两端的电压进行比较，获得所述的比较结果信号；所述的执行单元通过第一定时器获得所述的第一预定时间，所述的第一定时器由所述的比较结果信号的上升沿使能或者由所述的比较结果信号的下降沿使能。The peak-to-valley opening controller according to claim 19, characterized in that: the trigger unit obtains the end time of the maximum switching frequency limit of the diode rectifier circuit through the frequency limit timer; the comparison unit uses the comparator Comparing the voltages at both ends of the energy storage inductor to obtain the comparison result signal; the execution unit obtains the first predetermined time through the first timer, and the first timer is determined by the The rising edge of the comparison result signal is enabled or the falling edge of the comparison result signal is enabled.
  21. 根据权利要求19至20任一项所述的波峰波谷开通控制器，其特征在于：所述的二极管整流电路的工作状态为降压时，所述的预定条件为：The peak-to-valley turn-on controller according to any one of claims 19 to 20, characterized in that: when the working state of the diode rectifier circuit is step-down, the predetermined condition is:
    当Vin-Vth<＝2*Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波峰处开通；When Vin-Vth<=2*Vo, the main switch is turned on at the peak of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
    其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
  22. 根据权利要求19至20任一项所述的波峰波谷开通控制器，其特征在于：所述的二极管整流电路的工作状态为升压时，所述的预定条件为：The peak-to-valley turn-on controller according to any one of claims 19 to 20, characterized in that: when the working state of the diode rectifier circuit is boosting, the predetermined condition is:
    当2*Vin-Vth<＝Vo时，所述的主开关管在所述的第一预定时间结束后在所述的主开关管与所述的同步整流管连接节点的波谷处开通；When 2*Vin-Vth<=Vo, the main switch is turned on at the valley of the connection node between the main switch and the synchronous rectifier after the first predetermined time;
    其中Vin为所述的二极管整流电路的输入电压、Vo为所述的二极管整流电路的输出电压、Vth为一大于或等于0V的设定电压。Wherein Vin is the input voltage of the diode rectifier circuit, Vo is the output voltage of the diode rectifier circuit, and Vth is a set voltage greater than or equal to 0V.
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