Hybrid modulation method, system and device of isolated power supply chip and medium

Abstract

The invention discloses a hybrid modulation method, system and device for an isolated power supply chip and a medium, and the method comprises the steps: shielding a hysteresis control modulation mode after the primary side of the isolated power supply chip is powered on; when it is detected that the partial voltage of the output voltage of the secondary side reaches the reference voltage, a PWM modulation mode is controlled to be triggered, and a hysteresis control modulation mode is removed; if the output voltage is within the set voltage threshold window, controlling the isolated power supply chip to maintain a PWM modulation mode; if the output voltage is outside the voltage threshold window, controlling the isolation power supply chip to trigger a hysteresis control modulation mode; and after a hysteresis cycle is set, the isolation power supply chip is controlled to enter a PWM modulation mode. Only when it is detected that the output voltage is out of the voltage threshold window, the isolation power supply chip is controlled to trigger the hysteresis control modulation mode, and after the hysteresis period is set, the PWM modulation mode is entered again, so that the transient characteristic of the output voltage is improved, and the ripple of the output voltage is reduced.

Description

Technical Field

[0001] This invention relates to the field of chip control technology, and in particular to a hybrid modulation method, system, device and medium for an isolated power supply chip. Background Technology

[0002] Due to their use of electrical isolation technology, isolation chips offer irreplaceable advantages over non-isolated chips in terms of safety protection, interference immunity, and system reliability. Isolation chips are evolving towards higher integration, lower power consumption, and higher speeds, becoming a key component in complex electronic systems for ensuring performance and safety.

[0003] The isolated DC-DC converter is a crucial component of the isolation chip, primarily employing PWM modulation and hysteresis control modulation. The timing diagram for single PWM modulation in existing isolated power supply chips is shown below. Figure 1 As shown, the single hysteresis modulation timing of existing medium-isolation power supply chips Figure 2 As shown, Figure 1 In the load I L When a transition occurs, the transient response of PWM is worse than that of hysteresis control (V OS -V US >V H -V L Compared to hysteresis control, PWM output ripple voltage is smaller than the hysteresis control window voltage (V) under steady-state conditions, especially under light or heavy loads. H -V L ). Figure 2 In the load I L During the transition, the output voltage does not exhibit undershoot or overshoot. Compared to PWM modulation, when transitioning from light load to heavy load, the undershoot voltage V of PWM is significantly lower. US <V L ; V during the transition from heavy load to light load H <V OS This indicates that hysteresis control has better transient characteristics than PWM modulation, but in a certain steady state (light load or heavy load), the hysteresis control window voltage (V) H- V L It is also greater than the output voltage V during PWM modulation. OUT The ripple, hysteresis control compared to PWM modulation, output voltage V OUT The ripples are relatively large.

[0004] In summary, PWM modulation has a smaller output voltage ripple, but a poorer transient response; hysteresis control has a better transient response than PWM modulation, but its hysteresis control has a larger ripple. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor transient characteristics and large ripple caused by the use of separate PWM modulation and separate hysteresis control modulation for isolated DC-DC converters in the prior art, and to provide a hybrid modulation method, system, device and medium for isolated power supply chips.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] In a first aspect, the present invention provides a hybrid modulation method for an isolated power supply chip, the hybrid modulation method comprising:

[0008] After power-on on the primary side of the isolation power supply chip, the hysteresis control modulation mode is shielded.

[0009] When the output voltage division on the secondary side is detected to reach the reference voltage, the control triggers the PWM modulation mode and releases the hysteresis control modulation mode.

[0010] If the output voltage is within the set voltage threshold window, the isolated power supply chip is controlled to maintain the PWM modulation mode;

[0011] If the output voltage is outside the voltage threshold window, control the isolation power chip to trigger the hysteresis control modulation mode;

[0012] After setting the hysteresis period, the isolated power supply chip is controlled to enter the PWM modulation mode.

[0013] Preferably, the voltage threshold window includes a first voltage threshold and a second voltage threshold, wherein the first voltage threshold is greater than the second voltage threshold; the step of controlling the isolation power supply chip to trigger a hysteresis control modulation mode when the output voltage is outside the voltage threshold window includes:

[0014] If the output voltage is not less than the first voltage threshold, the first hysteresis control modulation mode is triggered; the first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side from heavy load to light load.

[0015] If the output voltage is not greater than the second voltage threshold, the control triggers the second hysteresis control modulation mode; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

[0016] Preferably, the step of controlling the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period includes:

[0017] In the first hysteresis control modulation mode, when the output voltage is equal to the second voltage threshold, the first counter is started to record the first value;

[0018] When the first value reaches the hysteresis period threshold, the isolated power supply chip is controlled to enter the PWM modulation mode.

[0019] Preferably, the step of controlling the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period includes:

[0020] In the second hysteresis control modulation mode, the second counter is directly started to record the second value;

[0021] When the second value reaches the hysteresis period threshold, the isolated power supply chip is controlled to enter the PWM modulation mode.

[0022] In a second aspect, the present invention also provides a hybrid modulation system for an isolated power supply chip, the hybrid modulation system comprising:

[0023] The shielding module is used to shield the hysteresis control modulation mode after the primary side of the isolation power supply chip is powered on.

[0024] The detection module is used to control and trigger the PWM modulation mode and release the hysteresis control modulation mode when the voltage division of the output voltage on the secondary side reaches the reference voltage.

[0025] The first control module is used to control the isolation power chip to maintain the PWM modulation mode when the output voltage is within a set voltage threshold window.

[0026] The second control module is used to control the isolation power chip to trigger the hysteresis control modulation mode when the output voltage is outside the voltage threshold window.

[0027] The third control module is used to control the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period.

[0028] Preferably, the voltage threshold window includes a first voltage threshold and a second voltage threshold, wherein the first voltage threshold is greater than the second voltage threshold; the second control module includes:

[0029] The first triggering unit is used to control and trigger a first hysteresis control modulation mode when the output voltage is not less than the first voltage threshold; the first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from heavy load to light load.

[0030] The second triggering unit is used to control and trigger the second hysteresis control modulation mode when the output voltage is not greater than the second voltage threshold; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

[0031] Preferably, the third control module includes:

[0032] The first startup unit is used to start the first counter to record a first value when the output voltage is equal to the second voltage threshold under the first hysteresis control modulation mode.

[0033] The first control unit is used to control the isolated power supply chip to enter the PWM modulation mode when the first value reaches the hysteresis period threshold.

[0034] Preferably, the third control module includes:

[0035] The second start-up unit is used to directly start the second counter to record the second value in the second hysteresis control modulation mode;

[0036] The second control unit is used to control the isolated power supply chip to enter the PWM modulation mode when the second value reaches the hysteresis period threshold.

[0037] Thirdly, the present invention provides an electronic device including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the hybrid modulation method of the isolated power supply chip described in the first aspect.

[0038] Fourthly, the present invention provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of the hybrid modulation method for the isolated power supply chip described in the first aspect.

[0039] The positive and progressive effects of this invention are as follows: It provides a hybrid modulation method, system, device, and medium for an isolated power supply chip. When the output voltage is within a set voltage threshold window, the hybrid modulation method controls the isolated power supply chip to maintain PWM modulation mode; when the output voltage is outside the voltage threshold window, it controls the isolated power supply chip to trigger hysteresis control modulation mode; after setting the hysteresis period, it controls the isolated power supply chip to enter PWM modulation mode, which improves the transient characteristics of the output voltage and reduces the ripple of the output voltage. Attached Figure Description

[0040] Figure 1 This is a timing diagram of single PWM modulation for an isolated power supply chip in the prior art.

[0041] Figure 2 This is a timing diagram of single hysteresis modulation for isolated power supply chips in the prior art.

[0042] Figure 3 This is a first flowchart of the hybrid modulation method for the isolated power supply chip according to Embodiment 1 of the present invention.

[0043] Figure 4 This is a second flowchart of the hybrid modulation method for the isolated power supply chip in Embodiment 1 of the present invention.

[0044] Figure 5 This is a timing diagram of the heavy-load to light-load transition of the hybrid modulation method for the isolated power supply chip in Embodiment 1 of the present invention.

[0045] Figure 6 This is a timing diagram of the light-load to heavy-load transition of the hybrid modulation method for the isolated power supply chip in Embodiment 1 of the present invention.

[0046] Figure 7 This is a schematic diagram of the first module of the hybrid modulation system of the isolated power supply chip in Embodiment 2 of the present invention.

[0047] Figure 8 This is a schematic diagram of the second module of the hybrid modulation system of the isolated power supply chip in Embodiment 2 of the present invention.

[0048] Figure 9 This is a schematic diagram of the hardware structure of the electronic device according to Embodiment 3 of the present invention. Detailed Implementation

[0049] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0050] Example 1

[0051] This embodiment provides a hybrid modulation method for an isolated power supply chip, such as... Figure 3 As shown, the hybrid modulation method includes:

[0052] S11. After powering on the primary side of the isolation power supply chip, the hysteresis control modulation mode is shielded.

[0053] S12. When the output voltage division on the secondary side is detected to reach the reference voltage, the PWM modulation mode is triggered and the hysteresis control modulation mode is released.

[0054] S131. If the output voltage is within the set voltage threshold window, control the isolation power supply chip to maintain PWM modulation mode.

[0055] S132. If the output voltage is outside the voltage threshold window, control the isolation power supply chip to trigger the hysteresis control modulation mode.

[0056] S133. After setting the hysteresis period, control the isolated power supply chip to enter PWM modulation mode.

[0057] For steps S11-S12 above, the isolation power supply chip includes a primary side and a secondary side. After the primary side is powered on, the primary side begins to soft-start the DC current V. DD Invert to AC V AC Then, the AC voltage V, which is inverted from the primary side of the transformer, is converted by the transformer. AC The AC current V transmitted from the primary side to the secondary side of the transformer is rectified and transferred to the secondary side via the primary side. AC Rectified to DC output voltage V OUT This method converts the secondary side output voltage V OUT The voltage increases slowly, while simultaneously controlling the secondary side shielding hysteresis control mode. Output voltage V OUT <V THS Before the threshold voltage for soft start on the secondary side, the primary side outputs V to the secondary side via soft start. OUT Energy conversion. When the secondary side output voltage V OUT >V THS Afterwards, the primary side soft start ends, and the primary side begins to operate in soft start mode, with an output voltage V. OUT The voltage rises slowly, at the output voltage V OUT When the voltage approaches the reference voltage, the falling edge of the first pulse signal generated by the error amplifier EA of the PWM modulation mode and the ramp signal is used as the enable signal to release the hysteresis control modulation mode.

[0058] Regarding steps S131-S133 above, after triggering the PWM modulation mode, the secondary side enters the PWM modulation mode. In the PWM modulation mode, the output voltage V... OUT If V increases further, L <V OUT <V H Then the output voltage V OUT It will remain in PWM modulation mode. If V OUT =V L If the voltage drops, it enters the hysteresis control modulation mode. After a set number of 200 hysteresis cycles, it re-enters the PWM modulation mode. If the secondary side output voltage V increases after the first entry into the PWM modulation mode on the secondary side, it will enter the hysteresis control modulation mode. OUT Greater than or equal to V H (V) OUT ≥V H If the voltage is 200 hysteresis cycles, it will also enter the hysteresis control modulation mode. After this set number of 200 hysteresis cycles, it will switch from the hysteresis control modulation mode to the PWM modulation mode. This method ensures that the voltage V is maintained from power-on to output voltage V. OUT After stabilization, all are in PWM modulation mode. At the output V... OUT After I have a stable job, if LWhen the load suddenly changes to a heavy load, the output voltage V OUT It will drop to V L (V) OUT =V L The system transitions from PWM modulation mode to hysteresis control modulation mode. After a set number of 200 hysteresis cycles, the hysteresis control modulation mode ends, and the system re-enters PWM modulation mode. If I... L When the load suddenly changes to a light load, the output V OUT It will rise rapidly to V H (V) OUT =V H The system transitions from PWM modulation mode to hysteresis control modulation mode. After a set number of 200 hysteresis cycles, it exits hysteresis control modulation mode and re-enters PWM modulation mode. This hybrid modulation method only applies when the hysteresis modulation comparator threshold voltage window (V) is detected. H or V L Only when the specified number of hysteresis cycles (V) is reached will the hysteresis control modulation mode be entered. After 200 hysteresis cycles, the PWM modulation mode will be entered again, which can adjust the output voltage V. OUT Transient characteristics can also reduce the output voltage V OUT The purpose of ripples.

[0059] In one alternative implementation, such as Figure 4 As shown, the voltage threshold window includes a first voltage threshold and a second voltage threshold, where the first voltage threshold is greater than the second voltage threshold. Steps S132 and S133 specifically include:

[0060] S1321. If the output voltage is not less than the first voltage threshold, the first hysteresis control modulation mode is triggered. The first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side from heavy load to light load.

[0061] S1331. In the first hysteresis control modulation mode, when the output voltage equals the second voltage threshold, the first counter is started to record the first value.

[0062] S1332. When the first value reaches the hysteresis period threshold, the control isolation power supply chip enters the PWM modulation mode.

[0063] Specifically, such as Figure 5 As shown, I L Indicates the output load current, V OUT This indicates the output voltage. OVERSHOT represents the control signal for switching from PWM modulation mode to hysteresis control modulation mode when transitioning from heavy load to light load. L Under heavy load, the OVERSHOT signal is low, the isolation power supply chip operates in PWM modulation mode, and at time t8, I... LWhen suddenly switching from heavy load to light load, the output voltage V OUT The voltage rises rapidly, and at time t9, the output voltage V... OUT Rise to the first voltage threshold V H (V) OUT =V H Meanwhile, the hysteresis comparator detected V. OUT =V H At this point, the OVERSHOT control signal goes high, and the modulation mode changes from PWM modulation mode to the first hysteresis control modulation mode. In the first hysteresis control modulation mode, V... OUT It begins to decline when V is first detected in the first hysteresis control modulation mode. OUT Equal to the lower limit voltage V of the hysteresis comparison threshold L (V) OUT =V L When the first counter reaches the first value n (n=200) hysteresis period threshold, i.e., at time t11, the OVERSHOT control signal goes low again. When OVERSHOT goes low, the PWM modulation mode must be in a high-level state to ensure the output voltage V... OUT In a state of energy conversion (V OUT (rising state), thus ensuring the transition from the first hysteresis control modulation mode to the PWM modulation mode.

[0064] In this embodiment, when the load transitions from heavy load to light load, the system switches from PWM modulation to the first hysteresis control mode. The main purpose is to address the poor transient characteristics of the PWM mode. Within n hysteresis cycles, the output voltage V is controlled by hysteresis control. OUT The circuit gradually stabilizes before switching back to PWM modulation mode. The primary purpose of this switch is to reduce the large ripple issue associated with hysteresis control. During the transition from heavy load to light load, the process of switching from PWM modulation mode to the first hysteresis modulation control and then back to PWM modulation mode improves the output V. OUT Transient characteristics, while reducing the output voltage V OUT The ripples.

[0065] In one alternative implementation, such as Figure 4 As shown, the voltage threshold window includes a first voltage threshold and a second voltage threshold, where the first voltage threshold is greater than the second voltage threshold. Steps S132 and S133 specifically include:

[0066] S1322. If the output voltage is not greater than the second voltage threshold, the control triggers the second hysteresis control modulation mode; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

[0067] S1333, In the second hysteresis control modulation mode, the second counter is directly started to record the second value;

[0068] S1334. When the second value reaches the hysteresis period threshold, the control isolation power supply chip enters the PWM modulation mode.

[0069] Specifically, such as Figure 6 As shown, I L Indicates the output load current. V OUT This indicates the output voltage. PWM stands for Pulse Width Modulation, and UNDERSHOT is the control signal for switching from the PWM modulation mode to the second hysteresis control modulation mode. L Under light load conditions, the UNDERSHOT signal is low, and the isolation power supply chip operates in PWM modulation mode. At time t5, I... L Suddenly switching from light load to heavy load, the output voltage V OUT The descent accelerates, and at time t6, the output voltage V... OUT Descending to V L (V) OUT =V L Meanwhile, the hysteresis comparator detected V. OUT =V L The UNDERSHOT control signal immediately goes high, and the system begins to switch from PWM modulation to the second hysteresis control mode. At the same time, the UNDERSHOT control signal pulls down the ramp signal generated by the ramp generator that is compared with the output signal of the EA amplifier. The purpose is to ensure that the PWM modulation mode output is high after n (n=200) hysteresis control cycles.

[0070] Similarly, timing only begins after the UNDERSHOT control signal goes high. The second timer operates in the second hysteresis control modulation mode for n (n=200) hysteresis cycle thresholds. After n hysteresis cycle thresholds (at time t7), the UNDERSHOT control signal is turned low again, ending the second hysteresis control mode and switching back to PWM modulation mode. At this time, the PWM modulation mode is in a high-level state, causing the output voltage V to... OUT In the energy conversion state, the output voltage V OUT It is in the upward phase.

[0071] In this embodiment, I L When transitioning from light load to heavy load, the system switches from PWM modulation mode to the second hysteresis control modulation mode. The main purpose is to address the poor transient characteristics of the PWM mode. Within n cycles, the output voltage V is adjusted through hysteresis control. OUT Gradually stabilized, in V OUTAfter gradually stabilizing, it switches back to PWM modulation mode, primarily to reduce the large ripple caused by hysteresis control. Throughout the adjustment process, it transitions from PWM modulation mode to hysteresis control modulation mode and back to PWM modulation mode, thus reducing V... OUT The transient voltage difference further reduces the output voltage V. OUT The ripples.

[0072] In this embodiment, the isolation power chip is controlled to trigger the hysteresis control modulation mode only when the output voltage is detected to be outside the voltage threshold window. After setting the hysteresis period, it re-enters the PWM modulation mode, which improves the transient characteristics of the output voltage and reduces the ripple of the output voltage.

[0073] Example 2

[0074] This embodiment provides a hybrid modulation system for an isolated power supply chip, such as... Figure 7 As shown, the hybrid modulation system includes: a shielding module 210, a detection module 220, a first control module 230, a second control module 240, and a third control module 250.

[0075] The shielding module 210 is used to shield the hysteresis control modulation mode after the primary side of the isolation power supply chip is powered on.

[0076] The detection module 220 is used to control and trigger the PWM modulation mode and release the hysteresis control modulation mode when the voltage division of the output voltage on the secondary side reaches the reference voltage.

[0077] The first control module 230 is used to control the isolation power supply chip to maintain PWM modulation mode when the output voltage is within a set voltage threshold window.

[0078] The second control module 240 is used to control the isolation power chip to trigger the hysteresis control modulation mode when the output voltage is outside the voltage threshold window.

[0079] The third control module 250 is used to control the isolated power supply chip to enter PWM modulation mode after setting the hysteresis period.

[0080] The isolated power supply chip includes a primary side and a secondary side. After the primary side is powered on, it begins to soft-start the DC current V. DD Invert to AC V AC Then, the AC voltage V, which is inverted from the primary side of the transformer, is converted by the transformer. AC The AC current V transmitted from the primary side to the secondary side of the transformer is rectified and transferred to the secondary side via the primary side. AC Rectified to DC output voltage V OUT This method converts the secondary side output voltage V OUTThe voltage rises slowly, while the shielding module 210 controls the secondary-side shielding hysteresis control mode. Output voltage V OUT <V THS Before the threshold voltage for soft start on the secondary side, the primary side outputs V to the secondary side via soft start. OUT Energy conversion. When the secondary side output voltage V OUT >V THS Afterwards, the primary side soft start ends, and the primary side begins to operate in soft start mode, with an output voltage V. OUT The voltage rises slowly, and the detection module 220 detects the output voltage V. OUT When the voltage approaches the reference voltage, the falling edge of the first pulse signal generated by the error amplifier EA of the PWM modulation mode and the ramp signal is used as the enable signal to release the hysteresis control modulation mode.

[0081] After the PWM modulation mode is triggered, the secondary side enters the PWM modulation mode. In the PWM modulation mode, the output voltage V... OUT If V increases further, L <V OUT <V H The first control module 230 outputs voltage V. OUT It will remain in PWM modulation mode. If V OUT =V L If the voltage drops, it enters the hysteresis control modulation mode. After a set number of 200 hysteresis cycles, it re-enters the PWM modulation mode. If the secondary side output voltage V increases after the first entry into the PWM modulation mode on the secondary side, it will enter the hysteresis control modulation mode. OUT Greater than or equal to V H (V) OUT ≥V H The second control module 240 is triggered to enter the hysteresis control modulation mode. After a set number of 200 hysteresis cycles, it switches from the hysteresis control modulation mode to the PWM modulation mode. This method ensures that the output voltage V is maintained from power-on. OUT After stabilization, all are in PWM modulation mode. At the output V... OUT After I have a stable job, if L When the load suddenly changes to a heavy load, the output voltage V OUT It will drop to V L (V) OUT =V L The system transitions from PWM modulation mode to hysteresis control modulation mode. After a set number of 200 hysteresis cycles, the hysteresis control modulation mode ends, and the system re-enters PWM modulation mode. If I... L When the load suddenly changes to a light load, the output V OUT It will rise rapidly to V H (V) OUT=V H The system transitions from PWM modulation mode to hysteresis control modulation mode. After a set number of 200 hysteresis cycles, the third control module 250 terminates the hysteresis control modulation mode and re-enters PWM modulation mode. This hybrid modulation method only applies when the hysteresis modulation comparator threshold voltage window (V) is detected. H or V L Only when the specified number of hysteresis cycles (V) is reached will the hysteresis control modulation mode be entered. After 200 hysteresis cycles, the PWM modulation mode will be entered again, which can adjust the output voltage V. OUT Transient characteristics can also reduce the output voltage V OUT The purpose of ripples.

[0082] In one alternative implementation, such as Figure 8 As shown, the voltage threshold window includes a first voltage threshold and a second voltage threshold, where the first voltage threshold is greater than the second voltage threshold. The second control module 240 and the third control module 250 include:

[0083] The first trigger unit 241 is used to control and trigger the first hysteresis control modulation mode when the output voltage is not less than the first voltage threshold; the first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side from heavy load to light load.

[0084] The first start-up unit 251 is used to start the first counter to record the first value when the output voltage is equal to the second voltage threshold in the first hysteresis control modulation mode.

[0085] The first control unit 252 is used to control the isolated power supply chip to enter PWM modulation mode when the first value reaches the hysteresis period threshold.

[0086] Specifically, such as Figure 5 As shown, I L Indicates the output load current, V OUT This indicates the output voltage. OVERSHOT represents the control signal for switching from PWM modulation mode to hysteresis control modulation mode when transitioning from heavy load to light load. L Under heavy load, the OVERSHOT signal is low, the isolation power supply chip operates in PWM modulation mode, and at time t8, I... L When suddenly switching from heavy load to light load, the output voltage V OUT The voltage rises rapidly, and at time t9, the output voltage V... OUT Rise to the first voltage threshold V H (V) OUT =V H Meanwhile, the hysteresis comparator detected V. OUT =V HAt this point, the OVERSHOT control signal goes high, and the modulation mode changes from PWM modulation mode to the first hysteresis control modulation mode. In the first hysteresis control modulation mode, V... OUT It begins to decline when V is first detected in the first hysteresis control modulation mode. OUT Equal to the lower limit voltage V of the hysteresis comparison threshold L (V) OUT =V L When the first counter reaches the first value n (n=200) hysteresis period threshold, i.e., at time t11, the OVERSHOT control signal goes low again. When OVERSHOT goes low, the PWM modulation mode must be in a high-level state to ensure the output voltage V... OUT In a state of energy conversion (V OUT (rising state), thus ensuring the transition from the first hysteresis control modulation mode to the PWM modulation mode.

[0087] In this embodiment, when the load transitions from heavy load to light load, the system switches from PWM modulation to the first hysteresis control mode. The main purpose is to address the poor transient characteristics of the PWM mode. Within n hysteresis cycles, the output voltage V is controlled by hysteresis control. OUT The circuit gradually stabilizes before switching back to PWM modulation mode. The primary purpose of this switch is to reduce the large ripple issue associated with hysteresis control. During the transition from heavy load to light load, the process of switching from PWM modulation mode to the first hysteresis modulation control and then back to PWM modulation mode improves the output V. OUT Transient characteristics, while reducing the output voltage V OUT The ripples.

[0088] In one optional implementation, the voltage threshold window includes a first voltage threshold and a second voltage threshold, the first voltage threshold being greater than the second voltage threshold. The second control module 240 and the third control module 250 include:

[0089] The second trigger unit 242 is used to control the triggering of the second hysteresis control modulation mode when the output voltage is not greater than the second voltage threshold; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

[0090] The second start unit 253 is used to directly start the second counter to record the second value in the second hysteresis control modulation mode;

[0091] The second control unit 254 is used to control the isolated power supply chip to enter PWM modulation mode when the second value reaches the hysteresis period threshold.

[0092] Specifically, such as Figure 6 As shown, IL Indicates the output load current. V OUT This indicates the output voltage. PWM stands for Pulse Width Modulation, and UNDERSHOT is the control signal for switching from the PWM modulation mode to the second hysteresis control modulation mode. L Under light load conditions, the UNDERSHOT signal is low, and the isolation power supply chip operates in PWM modulation mode. At time t5, I... L Suddenly switching from light load to heavy load, the output voltage V OUT The descent accelerates, and at time t6, the output voltage V... OUT Descending to V L (V) OUT =V L Meanwhile, the hysteresis comparator detected V. OUT =V L The UNDERSHOT control signal immediately goes high, and the second trigger unit 242 triggers the switch from PWM modulation to the second hysteresis control mode. At the same time, the UNDERSHOT control signal pulls down the ramp signal generated by the ramp generator that is compared with the output signal of the EA amplifier. The purpose is to ensure that the PWM modulation mode output is high after n (n=200) hysteresis control cycles.

[0093] Similarly, timing only begins after the UNDERSHOT control signal goes high. The second start unit 253 controls the second timer to operate in the second hysteresis control modulation mode for n (n=200) hysteresis cycle thresholds. After n hysteresis cycle thresholds (at time t7), the UNDERSHOT control signal is turned low again, ending the second hysteresis control mode. The second control unit 254 then switches back to PWM modulation mode, which is now high, causing the output voltage V to... OUT In the energy conversion state, the output voltage V OUT It is in the upward phase.

[0094] In this embodiment, I L When transitioning from light load to heavy load, the system switches from PWM modulation mode to the second hysteresis control modulation mode. The main purpose is to address the poor transient characteristics of the PWM mode. Within n cycles, the output voltage V is adjusted through hysteresis control. OUT Gradually stabilized, in V OUT After gradually stabilizing, it switches back to PWM modulation mode, primarily to reduce the large ripple caused by hysteresis control. Throughout the adjustment process, it transitions from PWM modulation mode to hysteresis control modulation mode and back to PWM modulation mode, thus reducing V... OUT The transient voltage difference further reduces the output voltage V. OUT The ripples.

[0095] In this embodiment, the second control module controls the isolation power chip to trigger the hysteresis control modulation mode only when it detects that the output voltage is outside the voltage threshold window, and the third control module re-enters the PWM modulation mode after setting the hysteresis period, which improves the transient characteristics of the output voltage and reduces the ripple of the output voltage.

[0096] Example 3

[0097] Figure 9 This is a schematic diagram of the structure of an electronic device provided in this embodiment. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the hybrid modulation method of the isolated power supply chip in Embodiment 1. Figure 9 The electronic device 60 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0098] Electronic device 60 may be in the form of a general-purpose computing device, such as a server device. Components of electronic device 60 may include, but are not limited to: at least one processor 61, at least one memory 62, and a bus 63 connecting different system components (including memory 62 and processor 61).

[0099] Bus 63 includes a data bus, an address bus, and a control bus.

[0100] The memory 62 may include volatile memory, such as random access memory (RAM) 621 and / or cache memory 622, and may further include read-only memory (ROM) 623.

[0101] The memory 62 may also include a program / utility 625 having a set (at least one) of program modules 324, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0102] The processor 61 executes various functional applications and data processing by running computer programs stored in the memory 62, such as the hybrid modulation method of the isolated power supply chip in Embodiment 1 of the present invention.

[0103] Electronic device 60 can also communicate with one or more external devices 64 (e.g., keyboard, pointing device, etc.). This communication can be performed via input / output (I / O) interface 65. Furthermore, the model-generated device 60 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public network, such as the Internet) via network adapter 66. As shown, network adapter 66 communicates with other modules of the model-generated device 60 via bus 63. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the model-generated device 60, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0104] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0105] Example 4

[0106] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the hybrid modulation method for the isolated power supply chip of Embodiment 1.

[0107] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0108] In a possible implementation, the present invention can also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, is used to cause the terminal device to perform the steps of implementing the hybrid modulation method of the isolated power chip of Embodiment 1.

[0109] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0110] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A hybrid modulation method for an isolated power supply chip, characterized in that, The hybrid modulation method includes: After power-on on the primary side of the isolation power supply chip, the hysteresis control modulation mode is shielded. When the output voltage division on the secondary side is detected to reach the reference voltage, the control triggers the PWM modulation mode and releases the hysteresis control modulation mode. If the output voltage is within the set voltage threshold window, the isolated power supply chip is controlled to maintain the PWM modulation mode; If the output voltage is outside the voltage threshold window, control the isolation power chip to trigger the hysteresis control modulation mode; After setting the hysteresis period, the isolated power supply chip is controlled to enter the PWM modulation mode.

2. The hybrid modulation method for the isolated power supply chip as described in claim 1, characterized in that, The voltage threshold window includes a first voltage threshold and a second voltage threshold, wherein the first voltage threshold is greater than the second voltage threshold; the step of controlling the isolated power supply chip to trigger a hysteresis control modulation mode when the output voltage is outside the voltage threshold window includes: If the output voltage is not less than the first voltage threshold, the first hysteresis control modulation mode is triggered; the first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side from heavy load to light load. If the output voltage is not greater than the second voltage threshold, the control triggers the second hysteresis control modulation mode; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

3. The hybrid modulation method for the isolated power supply chip as described in claim 2, characterized in that, The step of controlling the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period includes: In the first hysteresis control modulation mode, when the output voltage is equal to the second voltage threshold, the first counter is started to record the first value; When the first value reaches the hysteresis period threshold, the isolated power supply chip is controlled to enter the PWM modulation mode.

4. The hybrid modulation method for the isolated power supply chip as described in claim 2, characterized in that, The step of controlling the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period includes: In the second hysteresis control modulation mode, the second counter is directly started to record the second value; When the second value reaches the hysteresis period threshold, the isolated power supply chip is controlled to enter the PWM modulation mode.

5. A hybrid modulation system for an isolated power supply chip, characterized in that, The hybrid modulation system includes: The shielding module is used to shield the hysteresis control modulation mode after the primary side of the isolation power supply chip is powered on. The detection module is used to control and trigger the PWM modulation mode and release the hysteresis control modulation mode when the voltage division of the output voltage on the secondary side reaches the reference voltage. The first control module is used to control the isolation power chip to maintain the PWM modulation mode when the output voltage is within a set voltage threshold window. The second control module is used to control the isolation power chip to trigger the hysteresis control modulation mode when the output voltage is outside the voltage threshold window. The third control module is used to control the isolated power supply chip to enter the PWM modulation mode after setting the hysteresis period.

6. The hybrid modulation system of the isolated power supply chip as described in claim 5, characterized in that, The voltage threshold window includes a first voltage threshold and a second voltage threshold, wherein the first voltage threshold is greater than the second voltage threshold. The second control module includes: The first triggering unit is used to control and trigger a first hysteresis control modulation mode when the output voltage is not less than the first voltage threshold; the first hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from heavy load to light load. The second triggering unit is used to control and trigger the second hysteresis control modulation mode when the output voltage is not greater than the second voltage threshold; the second hysteresis control modulation mode is used to characterize the modulation mode of the load current on the secondary side switching from light load to heavy load.

7. The hybrid modulation system of the isolated power supply chip as described in claim 6, characterized in that, The third control module includes: The first startup unit is used to start the first counter to record a first value when the output voltage is equal to the second voltage threshold under the first hysteresis control modulation mode. The first control unit is used to control the isolated power supply chip to enter the PWM modulation mode when the first value reaches the hysteresis period threshold.

8. The hybrid modulation system of the isolated power supply chip as described in claim 6, characterized in that, The third control module includes: The second start-up unit is used to directly start the second counter to record the second value in the second hysteresis control modulation mode; The second control unit is used to control the isolated power supply chip to enter the PWM modulation mode when the second value reaches the hysteresis period threshold.

9. An electronic device, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the hybrid modulation method for the isolated power supply chip as described in any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the hybrid modulation method for the isolated power supply chip as described in any one of claims 1-4.

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