Bang-Bang charge compound control circuit and control method based on double-ring competition

Abstract

The invention discloses a Bang-Bang charge compound control circuit and control method based on double-ring competition, and belongs to the technical field of switching power supplies. Comprising an LLC resonant converter and a control circuit, and the control circuit comprises a voltage loop feedback circuit, a current loop feedback circuit, a double-loop competition comparison circuit, a Bang-Bang charge control logic unit, a driving circuit and a sampling circuit. Aiming at the problems of low dynamic response speed, complex compensation network design and the like of frequency modulation control or pulse width modulation of a traditional LLC converter, a brand new control concept based on Bang-Bang charge control is provided, and a double-ring competitive control architecture is constructed on the basis to meet the requirements of constant voltage and constant current of an LED illumination driving system. And the problems of loop conflict, compensation network dynamic characteristic mismatching and the like in the system design process are solved, so that the LLC converter has quick dynamic response, simplified loop design and undisturbed automatic switching capability between constant voltage / constant current modes in the constant voltage and constant current application.

Description

Technical Field

[0001] This invention relates to the field of circuit design technology, and in particular to a Bang-Bang charge recombination control circuit and control method based on dual-ring competition. Background Technology

[0002] Switching power supplies are widely used in power electronics due to their high efficiency, high power density, and excellent voltage regulation. Among them, the DC-DC resonant converter, which combines high efficiency and electrical isolation, has become one of the preferred topologies for medium-to-high power density power supply designs. Among various resonant converters, the LLC resonant converter stands out because its primary-side switching transistors can achieve zero-voltage turn-on (ZVS) and its secondary-side rectifier diodes can achieve zero-current turn-off (ZCS). It also achieves efficient energy conversion over a wide input voltage and load range, making it particularly suitable for scenarios with stringent output stability requirements, such as LED lighting drivers. In LED lighting drivers, switching power supplies need to provide not only constant voltage output but also constant current output, and be able to automatically and smoothly switch between the two modes according to load changes to ensure LED luminous stability and lifespan.

[0003] The traditional control method for LLC resonant converters is frequency modulation, which adjusts the switching frequency to change the gain of the resonant network, thereby stabilizing the output voltage or current. However, this control method has inherent limitations: as a high-order, nonlinear controlled object, the LLC resonant converter has a right-half-plane zero in its small-signal model, which in principle limits the bandwidth of the closed-loop control system. This results in generally slow dynamic response for frequency modulation-based schemes. To overcome this deficiency, existing technologies have explored schemes such as hybrid control of pulse width modulation (PWM) and pulse frequency modulation (PFM), and variable frequency phase-shift control. These schemes can be regarded as changes or combinations of control variables, but none of them have overcome the bandwidth limitation caused by the high-order characteristics of the controlled object itself. In scenarios where both constant voltage and constant current objectives need to be considered, not only is loop compensation difficult, but there is also the problem of narrow bandwidth.

[0004] For applications requiring both constant voltage and constant current, a dual-loop control system (voltage loop + current loop competitive control) is the mainstream design approach. Under normal operating conditions, a single loop (voltage loop or current loop) dominates the control. When the sampled signal meets a preset trigger condition, the other loop seamlessly takes over until the sampled signal returns to its initial state and then returns to the original mode. For example, Chinese invention patent CN117175921A discloses an adjustable dual-loop control circuit for a switching power supply, which achieves constant voltage / constant current mode switching through competitive switching between the voltage loop and the current loop, solving the technical problem of overcurrent shutdown in a single closed-loop system. However, the circuit design of this dual-loop control scheme is too complex, making it prone to loop conflicts during mode switching. For example, at the mode boundary (switching from constant current mode to constant voltage mode), if the dynamic characteristics of the compensation networks of the voltage loop and the current loop are inconsistent, it can lead to overshoot and undershoot of the output voltage / current, causing system instability and seriously affecting the reliability of sensitive loads such as LEDs. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and propose a Bang-Bang charge composite control circuit and control method based on dual-ring competition. By adopting the Bang-Bang charge control strategy, the traditional third-order model system of frequency control is simplified to a first-order system, realizing wide frequency domain response, faster dynamic response speed and smooth mode switching.

[0006] In a first aspect, the present invention provides a dual-ring competitive Bang-Bang charge composite control circuit, including an LLC resonant converter and a control circuit; the control circuit includes a voltage loop feedback circuit, a current loop feedback circuit, a dual-ring competitive comparator circuit, a Bang-Bang charge control logic unit, a driving circuit and a sampling circuit; The sampling circuit is used to acquire the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time. The voltage loop feedback circuit is used to compare the output voltage feedback signal Vosens with the preset output voltage setpoint signal Vp inside the voltage loop feedback circuit. After compensation by the compensation circuit in the voltage loop feedback circuit, a voltage error signal Verror is generated. The current loop feedback circuit is used to compare the output current feedback signal Iosens with the preset output current setpoint signal Ip inside the current loop feedback circuit. After compensation by the compensation circuit in the current loop feedback circuit, a current error signal Ierror is generated. The dual-loop competitive comparator circuit is used to select the smaller value between the voltage error signal Verror and the current error signal Ierror as the effective control signal, so as to realize the automatic switching between constant voltage mode and constant current mode. The Bang-Bang charge control logic unit is used to dynamically compare the resonant capacitor voltage Vcr with the reference threshold of the Bang-Bang charge control logic unit to generate a switching control signal; the reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. The driving circuit is used to amplify and level-shift the switching control signal, drive the switching transistors in the LLC resonant converter to turn on and off, adjust the charge injection amount of the resonant cavity circuit in the LLC resonant converter, and output a stable voltage or current.

[0007] The Bang-Bang charge composite control circuit based on dual-loop competition provided by this invention solves the problem of automatic switching between constant voltage and constant current modes by employing a dual-loop competitive comparison circuit at the loop level and using an intelligent decision-making competition mechanism that selects the minimum value at the loop level. At the control level, a Bang-Bang charge control logic unit is used to directly control the single-cycle charge injection amount instead of indirect frequency or pulse width modulation, simplifying the traditional third-order model system of frequency control into a first-order system. This greatly simplifies the parameter tuning process of the compensation network, enabling the control loop to achieve a wide frequency domain response, thereby ensuring that the charge-controlled LLC resonant converter has a faster dynamic response speed than the traditional frequency-modulated LLC resonant converter.

[0008] As an optional embodiment of the control circuit of this invention, the voltage loop feedback circuit includes an operational amplifier U2 and a compensation circuit. The compensation circuit consists of a capacitor C1 and a resistor R1, and is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U2, forming a 2A-type voltage loop compensation circuit. The non-inverting input terminal of the operational amplifier U2 is connected to the output voltage setpoint signal Vp, the inverting input terminal is connected to the output voltage feedback signal Vosens collected by the output voltage sampling circuit, and the output terminal outputs the voltage error signal Verror. The current loop feedback circuit includes an operational amplifier U3 and a compensation circuit. The compensation circuit consists of a capacitor C2 and a resistor R3, and is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U3, forming a 2A-type current loop compensation circuit. The non-inverting input terminal of the operational amplifier U3 is connected to the output current setpoint signal Ip, the inverting input terminal is connected to the output current feedback signal Iosens collected by the output current sampling circuit, and the output terminal outputs the current error signal Ierror.

[0009] As an optional embodiment of the control circuit of the present invention, the dynamic comparison rule of the Bang-Bang charge control logic unit is as follows: when the resonant capacitor voltage Vcr ≥ the upper threshold VH of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the high-side switch and turn on the low-side switch in the LLC resonant converter; when the resonant capacitor voltage Vcr ≤ the lower threshold VL of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the low-side switch and turn on the high-side switch in the LLC resonant converter.

[0010] As an optional embodiment of the control circuit of this invention, the sampling circuit also acquires the input voltage Vinsens of the LLC resonant converter in real time; the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage are adaptively generated based on the effective control signal output by the dual-loop competitive comparator circuit and the input voltage Vinsens.

[0011] As an optional embodiment of the control circuit of the present invention, the dual-loop competitive comparator circuit is a minimum value selector. The minimum value selector includes diode D1, diode D2, pull-down resistor R2, and pull-down resistor R4. The anode of diode D1 is connected in series with the pull-down resistor R2 and is electrically connected to the output terminal of the voltage loop feedback circuit. The anode of diode D2 is connected in series with the pull-down resistor R4 and is electrically connected to the output terminal of the current loop feedback circuit. The cathodes of diodes D1 and D2 are both electrically connected to the output terminal of the dual-loop competitive comparator circuit. The voltage error signal Verror generated by the voltage loop feedback circuit and the current error signal Ierror generated by the current loop feedback circuit are both input to the minimum value selector. The minimum value selector selects the signal with the smaller value as the effective control signal and outputs it to the Bang-Bang charge control logic unit.

[0012] As an optional solution for the control circuit of this invention, the LLC resonant converter adopts a half-bridge LLC resonant topology, including a half-bridge switching circuit, a resonant cavity circuit, and a rectifier and filter circuit. The half-bridge switching circuit is composed of switching transistors Q1 and Q2 connected in series, and the switching transistors Q1 and Q2 are connected in series across the input power supply Vin. The resonant cavity circuit includes a resonant inductor Lr, a magnetizing inductor Lm, a resonant capacitor Cr, and a transformer T1. The resonant inductor Lr, the magnetizing inductor Lm, and the resonant capacitor Cr are connected in series and then in parallel between the midpoint of Q1 and Q2 and ground to form a resonant circuit. The primary winding of the transformer T1 is connected in series with the resonant circuit, and the secondary winding, together with the rectifier diodes D1 and D2 and the output filter capacitor C0 in the rectifier and filter circuit, forms the rectifier and filter branch.

[0013] As a preferred embodiment of the above-mentioned optional solutions, the sampling circuit includes a resonant capacitor voltage sampling circuit, an input voltage sampling circuit, an output voltage sampling circuit, and an output current sampling circuit. The sampling terminal of the resonant capacitor voltage sampling circuit is electrically connected to the two ends of the resonant capacitor of the resonant cavity circuit, and a resistor-capacitor voltage divider is used for sampling. The sampling terminal of the input voltage sampling circuit is electrically connected to the input terminal of the half-bridge switching circuit, and a resistor voltage divider network is used for sampling. The sampling terminals of the output voltage sampling circuit and the output current sampling circuit are both electrically connected to the output terminal of the rectifier and filter circuit, and both are sampled using a resistor voltage divider network. The output current sampling circuit includes a sampling resistor Rsens and a filter capacitor, with the sampling resistor Rsens connected in series in the output circuit of the rectifier and filter circuit.

[0014] Secondly, the present invention provides a control method based on a dual-ring competition Bang-Bang charge recombination control circuit, wherein the dual-ring competition Bang-Bang charge recombination control circuit is the aforementioned control circuit, and the control method includes the following steps: S1. The sampling circuit acquires the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time, and transmits them to the corresponding circuits after filtering. S2. The voltage loop feedback circuit compares the voltage feedback signal Vosens with the output voltage setpoint signal Vp, and outputs the voltage error signal Verror after compensation; the current loop feedback circuit compares the output current feedback signal Iosens with the output current setpoint signal Ip, and outputs the current error signal Ierror after compensation. S3. The dual-loop competitive comparator circuit selects the smaller value between the voltage error signal Verror and the current error signal Ierror as the effective control signal to determine whether the system's priority adjustment target is constant voltage priority or constant current priority. S4. The Bang-Bang charge control logic unit dynamically compares the resonant capacitor voltage Vcr with the reference threshold of the Bang-Bang charge control logic unit to generate a switch control signal; the reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. S5. The drive circuit amplifies and levels-shifts the switch control signal to drive the switching transistor in the LLC resonant converter to turn on and off, adjusts the charge injection amount of the resonant cavity circuit in the LLC resonant converter, and outputs a stable voltage or current to the load. S6. Repeat steps S1-S5 to update the sampling signal and control signal in real time to achieve dynamic closed-loop control.

[0015] The control method based on the Bang-Bang charge composite control circuit with dual-ring competition provided by this invention has the following advantages: its core adopts an innovative and simplified logic of "competitive selection + threshold comparison", with fewer parameters and simpler control logic, which can be implemented using mature devices, effectively reducing hardware costs and R&D cycle; it can realize intelligent switching between constant voltage and constant current modes, adapting to multiple operating conditions such as load short circuit and light-heavy load switching, greatly improving the system's versatility; and with the dual-ring compensation mechanism, it can suppress output overshoot, accelerate response speed, and suppress output fluctuations, significantly optimizing the system's dynamic stability.

[0016] As an optional solution to the control method of the present invention, step S1 further includes real-time acquisition of the input voltage Vinsens of the LLC resonant converter; step S4 further includes the Bang-Bang charge control logic unit generating the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage based on the effective control signal and the input voltage Vinsens.

[0017] Thirdly, the present invention also provides a power supply device comprising the Bang-Bang charge recombination control circuit based on dual-ring competition as described in the claims above. The power supply device is used for LED driving to achieve constant voltage / constant current output and disturbance-free switching.

[0018] The power supply device provided by this invention includes a Bang-Bang charge composite control circuit based on dual-loop competition. By combining the intelligent decision-making of dual-loop competition with the fast execution of Bang-Bang charge control, it is a high-performance, high-reliability, and easy-to-design power supply device integrating constant voltage mode and constant current mode.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, some of which will become clear as the description proceeds, and others will be learned by practicing the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a block diagram of a Bang-Bang charge recombination control circuit based on dual-ring competition, provided as an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of a dual-loop competitive feedback control circuit provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of Bang-Bang charge control provided in an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of a Bang-Bang charge recombination control method based on dual-ring competition, provided in an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the hardware topology of a Bang-Bang charge recombination control circuit based on dual-ring competition, provided in an embodiment of this application.

[0026] Figure 6 The waveform diagram of the Bang-Bang charge recombination control circuit based on dual-ring competition provided in this application embodiment during load change is shown. The input voltage Vin=400V, the output voltage Vo=175V, and the load switches from 0A to 0.8A (no-load to full-load switching). Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0028] To address the problems of slow dynamic response, complex compensation network design, and loop conflicts in existing LLC resonant converter frequency modulation control or pulse width modulation in dual-loop control systems, embodiments of this application provide a Bang-Bang charge composite control circuit and method based on dual-loop competition. This composite control circuit combines the intelligent decision-making of "dual-loop competition" with the rapid execution of "Bang-Bang charge control," directly adjusting the amount of charge injected in each switching cycle to instantaneously control energy. This enables the LLC resonant converter in the dual-loop control system to have both fast dynamic response, simplified loop design, and the ability to automatically switch between constant voltage mode and constant current mode without disturbance.

[0029] This application provides a dual-ring competitive Bang-Bang charge recombination control circuit, such as... Figure 1 As shown, it includes an LLC resonant converter and a control circuit; the control circuit includes a voltage loop feedback circuit, a current loop feedback circuit, a dual-loop competitive comparator circuit, a Bang-Bang charge control logic unit, a drive circuit, and a sampling circuit; The sampling circuit is used to acquire the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time. It should be noted that the sampling circuit acquires the resonant capacitor voltage Vcr, which provides the Bang-Bang charge control logic unit with feedforward and state observation capabilities. By monitoring the key state variable (resonant capacitor voltage Vcr) that reflects the resonance process in real time, the Bang-Bang charge control logic unit can compensate for these disturbances in an instant, which greatly improves the dynamic response speed and anti-input disturbance capability of the system. The voltage loop feedback circuit compares the output voltage feedback signal Vosens with the preset output voltage command signal Vp inside the voltage loop feedback circuit. After compensation by the compensation circuit in the voltage loop feedback circuit, a voltage error signal Verror is generated. The current loop feedback circuit compares the output current feedback signal Iosens with the preset output current command signal Ip inside the current loop feedback circuit. After compensation by the compensation circuit in the current loop feedback circuit, a current error signal Ierror is generated. It should be noted that the voltage loop feedback circuit and the current loop feedback circuit have embedded compensation circuits, which can optimize the frequency response and phase response of the voltage loop / current loop. A dual-loop competitive comparator circuit selects the smaller value between the voltage error signal Verror and the current error signal Ierror as the effective control signal, enabling automatic switching between constant voltage and constant current modes. It's important to note that the dual-loop competitive comparator circuit continuously compares the magnitudes of the voltage error signal Verror and the current error signal Ierror, automatically selecting the smaller value as the effective control command for the system. This mechanism naturally achieves automatic and seamless switching between constant voltage and constant current modes: when the load is light, the voltage error signal is smaller, and the system operates in constant voltage mode; when the load increases and the output current reaches the current limit point, the current error signal is smaller, and the system automatically switches to constant current mode without the need for external switching logic. The Bang-Bang charge control logic unit dynamically compares the resonant capacitor voltage Vcr with the reference threshold of the Bang-Bang charge control logic unit to generate a switching control signal. The reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. It should be noted that the Bang-Bang charge control logic unit abandons the traditional voltage-controlled oscillator or PWM modulator. By dynamically comparing Vcr with VH and VL in a hysteresis loop, it generates a pair of drive pulses. The width of these pulses (i.e., the on-time) directly determines the amount of charge injected into the resonant cavity of the LLC resonant converter by the switching transistor in one switching cycle, thereby achieving fast and direct power regulation. The driver circuit amplifies and levels-shifts the switch control signal to drive the switching transistors in the LLC resonant converter to turn on and off, adjusts the charge injection amount in the resonant cavity circuit of the LLC resonant converter, and outputs a stable voltage or current. It should be noted that the driver circuit amplifies and levels-shifts the pulse control signal generated by the Bang-Bang charge control logic unit, outputting a pair of gate drive signals that meet the requirements of the switching transistors, ensuring reliable and fast driving of the switching transistors in the LLC resonant converter.

[0030] In some embodiments, the voltage loop feedback circuit includes an operational amplifier U2 and a compensation circuit. The compensation circuit consists of a capacitor C1 and a resistor R1, and is connected in parallel between the inverting input and output of the operational amplifier U2, forming a type 2A voltage loop compensation circuit. The non-inverting input of the operational amplifier U2 is connected to the output voltage setpoint signal Vp, the inverting input is connected to the output voltage feedback signal Vosens collected by the output voltage sampling circuit, and the output terminal outputs a voltage error signal Verror. The current loop feedback circuit includes an operational amplifier U3 and a compensation circuit. The compensation circuit consists of a capacitor C2 and a resistor R3, and is connected in parallel between the inverting input and output of the operational amplifier U3, forming a type 2A current loop compensation circuit. The non-inverting input of the operational amplifier U3 is connected to the output current setpoint signal Ip, the inverting input is connected to the output current feedback signal Iosens collected by the output current sampling circuit, and the output terminal outputs a current error signal Ierror. It should be noted that the voltage loop feedback circuit and the current loop feedback circuit are independent of each other and each is equipped with an independent compensation circuit to optimize their respective loop characteristics. The voltage loop control signal Verror output from the voltage loop feedback circuit reflects the deviation adjustment requirement between the current output voltage and the setpoint. The current loop control signal Ierror output from the current loop feedback circuit reflects the deviation adjustment requirement between the current output current and the setpoint.

[0031] In some embodiments, such as Figure 3As shown, the dynamic comparison rule of the Bang-Bang charge control logic unit is as follows: when the resonant capacitor voltage Vcr ≥ the upper threshold VH of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the high-side switch and turn on the low-side switch in the LLC resonant converter; when the resonant capacitor voltage Vcr ≤ the lower threshold VL of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the low-side switch and turn on the high-side switch in the LLC resonant converter. It should be noted that by directly monitoring the core state variable of the resonant cavity (resonant capacitor voltage) and comparing it with a reference threshold in real time, instantaneous and deterministic control of the switch action is achieved. This greatly shortens the control delay, enabling the system to accurately track the energy state of the resonant cavity, thereby achieving direct and rapid adjustment of the charge injection amount for each switching cycle. Simultaneously, the control logic of the high-side and low-side switches is strictly complementary and has a dead zone, fundamentally preventing the risk of bridge arm shoot-through and ensuring the safe and reliable operation of the power stage. This ensures that the control process is both fast and reliable, and is compatible with the high-frequency operating characteristics of the LLC resonant converter.

[0032] In some embodiments, the sampling circuit also acquires the input voltage Vinsens of the LLC resonant converter in real time; the upper threshold VH and lower threshold VL of the resonant capacitor voltage are adaptively generated based on the effective control signal output by the dual-loop competitive comparator circuit and the input voltage Vinsens. It should be noted that this adaptive mechanism can dynamically adjust the control threshold according to the input voltage and real-time load requirements, achieving immediate feedforward compensation of input voltage disturbances and precise matching of load conditions. This not only significantly improves the steady-state accuracy and dynamic response speed of the system, but also greatly enhances the dynamic stability of the system without increasing loop complexity.

[0033] In some embodiments, such as Figure 2As shown, the dual-loop competitive comparator circuit is a minimum value selector, which includes diodes D1 and D2, pull-down resistors R2 and R4. The anode of diode D1 is connected in series with the pull-down resistor R2 and is electrically connected to the output terminal of the voltage loop feedback circuit. The anode of diode D2 is connected in series with the pull-down resistor R4 and is electrically connected to the output terminal of the current loop feedback circuit. The cathodes of diodes D1 and D2 are both electrically connected to the output terminal of the dual-loop competitive comparator circuit. The voltage error signal Verror generated by the voltage loop feedback circuit and the current error signal Ierror generated by the current loop feedback circuit are both input to the minimum value selector. The minimum value selector selects the signal with the smaller value as the effective control signal and outputs it to the Bang-Bang charge control logic unit. It should be noted that the dual-loop competitive comparator circuit utilizes the unidirectional conductivity of diodes. When Ierror < Verror, diode D2 is turned on and diode D1 is turned off, and the system operates in the current loop. When Ierror > Verror, diode D2 is turned off and diode D1 is turned on, and the system operates in the voltage loop. By selecting the control signal with the smaller error in the dual loop as the initial value, dual-loop competitive control is achieved, ensuring that the system prioritizes the response to the output parameter that is closer to the threshold.

[0034] In some embodiments, the LLC resonant converter adopts a half-bridge LLC resonant topology, including a half-bridge switching circuit, a resonant cavity circuit, and a rectifier-filter circuit. The half-bridge switching circuit consists of switching transistors Q1 and Q2 connected in series, with Q1 and Q2 connected in series across the input power supply Vin. The resonant cavity circuit includes a resonant inductor Lr, a magnetizing inductor Lm, a resonant capacitor Cr, and a transformer T1. The resonant inductor Lr, magnetizing inductor Lm, and resonant capacitor Cr are connected in series and then in parallel between the midpoint of Q1 and Q2 and ground, forming a resonant circuit. The primary winding of the transformer T1 is connected in series with the resonant circuit, and the secondary winding, together with the rectifier diodes D1 and D2 and the output filter capacitor C0 in the rectifier-filter circuit, forms the rectifier-filter branch. It should be noted that the core function of the half-bridge switching circuit is to chop the DC input voltage into a high-frequency DC square wave voltage under the control of the drive signal, providing energy excitation for the subsequent resonant cavity circuit. The resonant cavity circuit receives high-frequency DC square wave voltage excitation and performs the following functions: 1) Soft switching: Utilizing the inductor-capacitor resonance phenomenon, it creates a zero-voltage turn-on condition for the switching transistors in the half-bridge switching circuit, significantly reducing switching losses. 2) Energy transfer and regulation: Through the resonance process, the high-frequency DC square wave voltage is converted into a high-frequency AC voltage and transferred to the secondary side via the transformer. 3) Providing key state variables for Bang-Bang charge control: The state of the resonant cavity directly reflects the transient process of energy transfer. The rectifier and filter circuit rectifies and smooths the high-frequency AC current on the secondary side of transformer T1 to obtain a stable DC voltage and current to supply the load.

[0035] In some embodiments, the sampling circuit includes a resonant capacitor voltage sampling circuit, an input voltage sampling circuit, an output voltage sampling circuit, and an output current sampling circuit. The sampling terminal of the resonant capacitor voltage sampling circuit is electrically connected to the two ends of the resonant capacitor in the resonant cavity circuit, and a resistor-capacitor voltage divider is used for sampling. The sampling terminal of the input voltage sampling circuit is electrically connected to the input terminal of the half-bridge switching circuit, and a resistor voltage divider network is used for sampling. The sampling terminals of both the output voltage sampling circuit and the output current sampling circuit are electrically connected to the output terminal of the rectifier-filter circuit, and both are sampled using a resistor voltage divider network. The output current sampling circuit includes a sampling resistor Rsens and a filter capacitor, with the sampling resistor Rsens connected in series in the output circuit of the rectifier-filter circuit. It should be noted that the sampling circuit uses a multi-dimensional parameter acquisition module, which can improve the accuracy of the acquired data.

[0036] This application also provides a control method based on a dual-ring competition Bang-Bang charge recombination control circuit, such as... Figure 4 As shown, the Bang-Bang charge recombination control circuit based on dual-ring competition is the control circuit described above, and the control method includes the following steps: S1. The sampling circuit acquires the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time, and transmits them to the corresponding circuits after filtering. S2. The voltage loop feedback circuit compares the voltage feedback signal Vosens with the output voltage setpoint signal Vp, and outputs the voltage error signal Verror after compensation; the current loop feedback circuit compares the output current feedback signal Iosens with the output current setpoint signal Ip, and outputs the current error signal Ierror after compensation. S3. By using a dual-loop competitive comparison circuit, the smaller value between the voltage error signal Verror and the current error signal Ierror is selected as the effective control signal to determine whether the system's priority adjustment target is constant voltage priority or constant current priority. S4. The resonant capacitor voltage Vcr is dynamically compared with the reference threshold of the Bang-Bang charge control logic unit to generate a switch control signal. The reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. S5. The drive circuit amplifies and levels-shifts the switch control signal to drive the switching transistor in the LLC resonant converter to turn on and off, adjusts the charge injection amount of the resonant cavity circuit in the LLC resonant converter, and outputs a stable voltage or current to the load. S6. Repeat steps S1-S5 to update the sampling and control signals in real time, achieving dynamic closed-loop control. It should be noted that by selecting the smaller value between the voltage and current errors in real time, a natural and smooth switching between CV / CC modes is achieved. Simultaneously, the drive signal is generated based on a direct comparison between the resonant capacitor voltage and the dynamic threshold, skipping traditional PWM modulation and complex compensation stages, thus achieving instantaneous and precise control of the charge injection amount for each switching cycle. This closed-loop process not only boasts extremely fast dynamic response and strong anti-interference capabilities, but also ensures system stability without relying on high-order linear compensation, significantly simplifying design and debugging complexity while maintaining output accuracy.

[0037] In some embodiments, step S1 further includes real-time acquisition of the input voltage Vinsens of the LLC resonant converter; step S4 further includes the Bang-Bang charge control logic unit generating an upper limit threshold VH and a lower limit threshold VL of the resonant capacitor voltage based on the effective control signal and the input voltage Vinsens. It should be noted that intelligent dynamic adjustment of the reference threshold is achieved through adaptive fusion of input voltage feedforward and load state feedback.

[0038] This application also provides a power supply device, which includes the Bang-Bang charge recombination control circuit based on dual-ring competition as described in the claims. The power supply device is used for LED driving and realizes constant voltage / constant current output and bumpless switching.

[0039] The following are some embodiments of this application, which will further describe in detail the technical aspects, circuit structure design and parameters of the control circuit of this application. Example 1

[0040] This embodiment provides a Bang-Bang charge recombination control circuit based on dual-ring competition, such as... Figure 1 As shown, the circuit includes an LLC resonant converter and a control circuit. The LLC resonant converter adopts a half-bridge LLC resonant topology, including an input power supply Vin and a half-bridge switching circuit, a resonant cavity circuit, and a rectifier filter circuit connected sequentially according to the energy transfer direction from DC input to DC output. The control circuit includes a voltage loop feedback circuit, a current loop feedback circuit, a dual-loop competitive comparator circuit, a Bang-Bang charge control logic unit, a drive circuit, and a sampling circuit.

[0041] The output of the rectifier-filter circuit is electrically connected to the input of the voltage loop feedback circuit and the current loop feedback circuit, respectively. The outputs of the voltage loop feedback circuit and the current loop feedback circuit are both electrically connected to the input of the dual-loop competitive comparator circuit. The output of the dual-loop competitive comparator circuit is electrically connected to the input of the Bang-Bang charge control logic unit. The output of the Bang-Bang charge control logic unit is electrically connected to the input of the drive circuit. The output of the drive circuit is electrically connected to the controlled end of the half-bridge switching circuit.

[0042] Specifically, such as Figure 1 , 5 As shown, the half-bridge switching circuit consists of switching transistors Q1 and Q2 connected in series, with Q1 and Q2 connected in series across the input power supply Vin. The resonant cavity circuit includes a resonant inductor Lr, a magnetizing inductor Lm, a resonant capacitor Cr, and a transformer T1. The resonant inductor Lr, magnetizing inductor Lm, and resonant capacitor Cr are connected in series and then in parallel between the midpoint of Q1 and Q2 and ground, forming a resonant circuit. The primary winding of transformer T1 is connected in series with the resonant circuit, and the secondary winding, together with rectifier diodes D1 and D2 and the output filter capacitor C0 in the rectifier and filter circuit, forms a rectifier and filter branch, outputting a stable DC voltage / current to the load RL.

[0043] Specifically, the sampling circuit includes a resonant capacitor voltage sampling circuit, an input voltage sampling circuit, an output voltage sampling circuit, and an output current sampling circuit. The sampling terminal of the resonant capacitor voltage sampling circuit is electrically connected to the two ends of the resonant capacitor in the resonant cavity circuit. A resistor-capacitor voltage divider is used to acquire the resonant capacitor voltage Vcr in real time and transmit it to the Bang-Bang charge control logic unit. The sampling terminal of the input voltage sampling circuit is electrically connected to the input terminal of the half-bridge switching circuit. A resistor voltage divider network is used to acquire the input voltage Vinsens of the half-bridge switching circuit in real time and transmit it to the Bang-Bang charge control logic unit. The sampling terminals of both the output voltage sampling circuit and the output current sampling circuit are electrically connected to the output terminal of the rectifier-filter circuit. A resistor voltage divider network is used to acquire the output voltage feedback signal Vosens and the output current feedback signal Iosens of the rectifier-filter circuit in real time and transmit them to the voltage loop feedback circuit and the current loop feedback circuit, respectively. The output current sampling circuit includes a sampling resistor Rsens and a filter capacitor. The sampling resistor Rsens is connected in series in the output loop of the rectifier-filter circuit.

[0044] Specifically, the voltage loop feedback circuit includes an operational amplifier U2 and a compensation circuit. The compensation circuit consists of a capacitor C1 and a resistor R1. The compensation circuit is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U2, forming a 2A-type voltage loop compensation circuit. The non-inverting input terminal of the operational amplifier U2 is connected to the output voltage setpoint signal Vp, and the inverting input terminal is connected to the output voltage feedback signal Vosens collected by the output voltage sampling circuit. The voltage loop feedback circuit compares the output voltage feedback signal Vosens with the output voltage setpoint signal Vp. After compensation by the 2A-type voltage loop compensation circuit, a voltage error signal Verror is generated and output through the output terminal.

[0045] Specifically, the current loop feedback circuit includes an operational amplifier U3 and a compensation circuit. The compensation circuit consists of a capacitor C2 and a resistor R3. The compensation circuit is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U3, forming a 2A type current loop compensation circuit. The non-inverting input terminal of the operational amplifier U3 is connected to the output current setpoint signal Ip, and the inverting input terminal is connected to the output current feedback signal Iosens collected by the output current sampling circuit. The current loop feedback circuit compares the output current feedback signal Iosens with the output current setpoint signal Ip. After compensation by the 2A type current loop compensation circuit, a current error signal Ierror is generated and output through the output terminal.

[0046] Specifically, such as Figure 2 As shown, the dual-loop competitive comparator circuit is a minimum value selector. The minimum value selector includes diodes D1 and D2, pull-down resistors R2 and R4. The anode of diode D1 is connected in series with the pull-down resistor R2 and is electrically connected to the output of the voltage loop feedback circuit. The anode of diode D2 is connected in series with the pull-down resistor R4 and is electrically connected to the output of the current loop feedback circuit. The cathodes of diodes D1 and D2 are both electrically connected to the output. The voltage error signal Verror generated by the voltage loop feedback circuit and the current error signal Ierror generated by the current loop feedback circuit are both input to the minimum value selector. The minimum value selector selects the signal with the smaller value as the valid control signal and outputs it to the Bang-Bang charge control logic unit. Furthermore, the dual-loop competitive comparator circuit utilizes the unidirectional conductivity of diodes. When Ierror < Verror, diode D2 is turned on and diode D1 is turned off, and the system operates in the current loop. When Ierror > Verror, diode D2 is turned off and diode D1 is turned on, and the system operates in the voltage loop. By selecting the control signal with the smaller error in the dual loop as the initial value, dual-loop competitive control is achieved, ensuring that the system prioritizes the response to output parameters that are closer to the threshold.

[0047] Specifically, such as Figure 3As shown, the Bang-Bang charge control logic unit receives a valid control command from the dual-loop contention comparator circuit and the input voltage Vinsens, which is acquired in real time by the sampling circuit. It adaptively generates an upper threshold VH and a lower threshold VL for the resonant capacitor voltage using the valid control signal and the input voltage Vinsens. Then, it dynamically compares the resonant capacitor voltage Vcr with the upper and lower thresholds VH and VL. When Vcr exceeds the upper threshold VH, the SR flip-flop turns off the high-side switch Q1. After a preset dead-time interval td, Q2 turns on. Conversely, when Vcr is below the lower threshold VL, the SR flip-flop controls the turn-off of the low-side switch Q2. After the same dead-time td, switch Q1 turns back on, thus achieving periodic switching of the system. The essence of the control principle is that the stable operation of the system output voltage can be achieved by precisely adjusting the amount of periodically injected charge. The amount of charge injected within a single switching cycle is determined by the energy storage state of the resonant capacitor when the power devices Q1 and Q2 are turned off. Therefore, by achieving precise control of the turn-off sequence of the switching transistors, closed-loop management of the amount of charge injected can be realized.

[0048] Specifically, the drive circuit amplifies the Bang-Bang control signal and drives Q1 and Q2 to turn on and off, adjusting the energy transfer efficiency of the resonant circuit so that the power stage circuit outputs a stable voltage and current to the load. Example 2

[0049] This embodiment provides a control method for the Bang-Bang charge recombination control circuit based on dual-ring competition as described in Embodiment 1, such as... Figure 4 As shown, the control method includes the following steps.

[0050] Step S1, Sampling Stage: The resonant capacitor voltage sampling circuit acquires the resonant capacitor voltage Vcr of the power stage circuit in real time, and the input voltage sampling circuit acquires the input voltage Vinsens in real time, both of which are transmitted to the Bang-Bang charge control logic unit. The output voltage sampling circuit and the output current sampling circuit acquire and output current feedback signals Iosens and Vosens in real time, and transmit them to the voltage loop feedback circuit and the current loop feedback circuit, respectively.

[0051] Step S2, Dual-loop feedback processing stage: The current loop feedback circuit compares Iosens with the output current given Ip, and outputs the current loop control signal Ierror after compensation circuit; the voltage loop feedback circuit compares Vosens with the output voltage given Vp, and outputs the voltage loop control signal Verror after compensation circuit.

[0052] Step S3, Dual-loop competition comparison stage: The minimum value selector selects the smaller value between Ierror and Verror as the effective control signal to determine whether the current system's priority adjustment target is constant current priority or constant voltage priority.

[0053] Step S4, Bang-Bang Charge Control Stage: The Bang-Bang charge control logic unit generates an upper threshold VH and a lower threshold VL for the resonant capacitor voltage based on the input voltage signal Vinsens and the effective control signal. It dynamically compares the real-time sampled resonant capacitor voltage Vcr with VH and VL respectively to generate corresponding switching control signals. The resulting modulation pulse sequence enables precise control of the switching transistor turn-off timing, achieving closed-loop management of the charge injection amount. Specifically, when Vcr exceeds the upper threshold VH, the SR trigger activates the high-side switch Q1 to turn off. After a preset dead-time interval td, Q2 enters the conducting state. Conversely, when Vcr is below the lower threshold VL, the SR trigger controls the turn-off of the low-side switch Q2. After the same dead-time td, switch Q1 turns back on, thus achieving periodic switching state alternation in the system.

[0054] Step S5, Drive and Power Output Stage: The drive circuit amplifies the Bang-Bang control signal and drives Q1 and Q2 to turn on and off, adjusting the energy transfer efficiency of the resonant circuit so that the power stage circuit outputs a stable voltage and current to the load.

[0055] Step S6, Closed-loop Iteration Stage: Repeat the above steps to update the sampling signal and control signal in real time to achieve dynamic closed-loop control and ensure that the system can still output stably when the load changes or the input voltage fluctuates. Example 3

[0056] To further illustrate the advantages of the Bang-Bang charge recombination control circuit and control method based on dual-ring competition of the present invention, a circuit example of the present invention is given below.

[0057] A simulation circuit was built based on the main parameters of the control circuit below, such as... Figure 5 As shown.

[0058] Input voltage Vin: DC380~395V; Output parameters: Rated output voltage Vout = 175V, rated output current Iout = 0.8A; Sampling circuits: Output voltage sampling circuit R26=360kΩ, R18=5.6kΩ, R30=68kΩ; Output current sampling circuit R29=40mΩ, R23=1kΩ, C5=47nF. Dual-loop feedback circuit: OP1=OP2=AP4310; current loop compensation circuit R13=10kΩ, C7=47nF; voltage loop compensation circuit R28=100kΩ, C8=47nF; output current setting Ip=35.8mV, output voltage setting Vp=2.5V; Dual-ring competitive comparator circuit: D3=D4=1N4148, R21=1kΩ, R22=1kΩ; Bang-Bang charge control logic unit: U7=Tea2016 Power stage circuit: Q1=Q2=G1N65R150PB, Lr=85μH, Lm=620μH, Cr=47nF, T1 (turn ratio 20:17), D5=D6=C6D10065A, EC1=100μF / 250V, RL=218.8Ω (rated load).

[0059] This embodiment simulates the dynamic characteristics of a Bang-Bang charge recombination control circuit based on dual-ring competition. Figure 6 The image shows the dynamic response waveform of a Bang-Bang charge recombination control circuit based on dual-loop competition, with an input voltage of 400V and a closed-loop control output voltage of 175V, during a no-load to full-load switching (output current abruptly changes from 0A to 0.8A) at 40ms. Figure 6 It can be seen that the output voltage drop of this circuit is only 15mV and the dynamic response time is 0.3ms, which shows that the present invention has good dynamic characteristics.

[0060] The above are embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A dual-ring competitive Bang-Bang charge recombination control circuit, characterized in that: It includes an LLC resonant converter and a control circuit; the control circuit includes a voltage loop feedback circuit, a current loop feedback circuit, a dual-loop competitive comparator circuit, a Bang-Bang charge control logic unit, a drive circuit, and a sampling circuit; The sampling circuit is used to acquire the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time. The voltage loop feedback circuit is used to compare the output voltage feedback signal Vosens with the preset output voltage setpoint signal Vp inside the voltage loop feedback circuit, and generates a voltage error signal Verror after compensation by the compensation circuit in the voltage loop feedback circuit; the current loop feedback circuit is used to compare the output current feedback signal Iosens with the preset output current setpoint signal Ip inside the current loop feedback circuit, and generates a current error signal Ierror after compensation by the compensation circuit in the current loop feedback circuit. The dual-loop competitive comparator circuit is used to select the smaller value between the voltage error signal Verror and the current error signal Ierror as the effective control signal, so as to realize the automatic switching between constant voltage mode and constant current mode. The Bang-Bang charge control logic unit is used to dynamically compare the resonant capacitor voltage Vcr with the reference threshold of the Bang-Bang charge control logic unit to generate a switch control signal; the reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. The driving circuit is used to amplify and level-shift the switch control signal, drive the switching transistor in the LLC resonant converter to turn on and off, adjust the charge injection amount of the resonant cavity circuit in the LLC resonant converter, and output a stable voltage or current.

2. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 1, characterized in that: The voltage loop feedback circuit includes an operational amplifier U2 and a compensation circuit. The compensation circuit consists of a capacitor C1 and a resistor R1, and is connected in parallel between the inverting input and output of the operational amplifier U2, forming a type 2A voltage loop compensation circuit. The non-inverting input of the operational amplifier U2 is connected to the output voltage setpoint signal Vp, the inverting input is connected to the output voltage feedback signal Vosens collected by the output voltage sampling circuit, and the output terminal outputs a voltage error signal Verror. The current loop feedback circuit includes an operational amplifier U3 and a compensation circuit. The compensation circuit consists of a capacitor C2 and a resistor R3, and is connected in parallel between the inverting input and output of the operational amplifier U3, forming a type 2A current loop compensation circuit. The non-inverting input of the operational amplifier U3 is connected to the output current setpoint signal Ip, the inverting input is connected to the output current feedback signal Iosens collected by the output current sampling circuit, and the output terminal outputs a current error signal Ierror.

3. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 1, characterized in that, The dynamic comparison rule of the Bang-Bang charge control logic unit is as follows: when the resonant capacitor voltage Vcr ≥ the upper threshold VH of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the high-side switch and turn on the low-side switch in the LLC resonant converter; when the resonant capacitor voltage Vcr ≤ the lower threshold VL of the resonant capacitor voltage, the Bang-Bang charge control logic unit outputs a control signal to turn off the low-side switch and turn on the high-side switch in the LLC resonant converter.

4. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 1, characterized in that, The sampling circuit also acquires the input voltage Vinsens of the LLC resonant converter in real time; the upper threshold VH and the lower threshold VL of the resonant capacitor voltage are adaptively generated based on the effective control signal output by the dual-loop competitive comparator circuit and the input voltage Vinsens.

5. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 1, characterized in that, The dual-loop competitive comparator circuit is a minimum value selector, which includes diodes D1 and D2, pull-down resistors R2 and R4. The anode of diode D1 is connected in series with the pull-down resistor R2 and is electrically connected to the output terminal of the voltage loop feedback circuit. The anode of diode D2 is connected in series with the pull-down resistor R4 and is electrically connected to the output terminal of the current loop feedback circuit. The cathodes of diodes D1 and D2 are both electrically connected to the output terminal of the dual-loop competitive comparator circuit. The voltage error signal Verror generated by the voltage loop feedback circuit and the current error signal Ierror generated by the current loop feedback circuit are input to the minimum value selector. The minimum value selector selects the signal with the smaller value as the effective control signal and outputs it to the Bang-Bang charge control logic unit.

6. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 1, characterized in that, The LLC resonant converter adopts a half-bridge LLC resonant topology, including a half-bridge switching circuit, a resonant cavity circuit, and a rectifier-filter circuit. The half-bridge switching circuit consists of a series connection of switching transistors Q1 and Q2, which are connected in series across the input power supply Vin. The resonant cavity circuit includes a resonant inductor Lr, a magnetizing inductor Lm, a resonant capacitor Cr, and a transformer T1. The resonant inductor Lr, magnetizing inductor Lm, and resonant capacitor Cr are connected in series and then in parallel between the midpoint of Q1 and Q2 and ground, forming a resonant circuit. The primary winding of the transformer T1 is connected in series with the resonant circuit, and the secondary winding, together with the rectifier diodes D1 and D2 and the output filter capacitor C0 in the rectifier-filter circuit, forms the rectifier-filter branch.

7. The Bang-Bang charge recombination control circuit based on dual-ring competition according to claim 6, characterized in that, The sampling circuit includes a resonant capacitor voltage sampling circuit, an input voltage sampling circuit, an output voltage sampling circuit, and an output current sampling circuit. The sampling terminal of the resonant capacitor voltage sampling circuit is electrically connected to the two ends of the resonant capacitor of the resonant cavity circuit, and a resistor-capacitor voltage divider is used for sampling. The sampling terminal of the input voltage sampling circuit is electrically connected to the input terminal of the half-bridge switching circuit, and a resistor voltage divider network is used for sampling. The sampling terminals of the output voltage sampling circuit and the output current sampling circuit are both electrically connected to the output terminal of the rectifier and filter circuit, and both are sampled using a resistor voltage divider network. The output current sampling circuit includes a sampling resistor Rsens and a filter capacitor, and the sampling resistor Rsens is connected in series in the output circuit of the rectifier and filter circuit.

8. A control method based on a dual-ring competition Bang-Bang charge recombination control circuit, characterized in that, The Bang-Bang charge recombination control circuit based on dual-ring competition is the control circuit described in any one of claims 1-7, and the control method includes the following steps: S1. The sampling circuit acquires the resonant capacitor voltage Vcr, output voltage feedback signal Vosens, and output current feedback signal Iosens of the LLC resonant converter in real time, and transmits them to the corresponding circuits after filtering. S2. The voltage loop feedback circuit compares the voltage feedback signal Vosens with the output voltage setpoint signal Vp, and outputs the voltage error signal Verror after compensation; the current loop feedback circuit compares the output current feedback signal Iosens with the output current setpoint signal Ip, and outputs the current error signal Ierror after compensation. S3. By using a dual-loop competitive comparison circuit, the smaller value between the voltage error signal Verror and the current error signal Ierror is selected as the effective control signal to determine whether the system's priority adjustment target is constant voltage priority or constant current priority. S4. The resonant capacitor voltage Vcr is dynamically compared with the reference threshold of the Bang-Bang charge control logic unit to generate a switch control signal; the reference threshold includes the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage. S5. The drive circuit amplifies and levels-shifts the switch control signal to drive the switch in the LLC resonant converter to turn on and off, adjusts the charge injection amount of the resonant cavity circuit in the LLC resonant converter, and outputs a stable voltage or current to the load. S6. Repeat steps S1-S5 to update the sampling signal and control signal in real time to achieve dynamic closed-loop control.

9. The Bang-Bang charge recombination control method based on dual-ring competition according to claim 8, characterized in that, Step S1 also includes real-time acquisition of the input voltage Vinsens of the LLC resonant converter; Step S4 also includes the Bang-Bang charge control logic unit generating the upper limit threshold VH and the lower limit threshold VL of the resonant capacitor voltage based on the valid control signal and the input voltage Vinsens.

10. A power supply device, characterized in that, The power supply device includes the Bang-Bang charge recombination control circuit based on dual-ring competition as described in any one of claims 1-7, and is used for LED driving to achieve constant voltage / constant current output and bumpless switching.

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