Control circuit of DC-DC conversion circuit
By employing primary current droop feedback and a droop current sharing controller in the DC-DC converter circuit, the problems of low current sharing accuracy and parameter sensitivity in traditional droop current sharing control are solved, achieving high stability and low cost current sharing control, which is suitable for distributed power systems with high reliability requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU YIGONG POWER TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-24
AI Technical Summary
Traditional droop current sharing control suffers from low current sharing accuracy, parameter sensitivity, and dynamic coupling problems when multiple converters are operating in parallel, making it difficult to meet high reliability requirements.
The primary current droop feedback is used to replace the traditional output current or inductor current detection. Combined with the droop current sharing controller and pole placement method, an additional control loop is designed to achieve current sharing through localized droop control, thereby reducing parameter sensitivity and suppressing mutual interference.
It improves the stability and reliability of the system in parallel operation, reduces current sharing error, resolves the contradiction between voltage drop and current sharing, supports modular expansion, and saves communication hardware costs.
Smart Images
Figure CN224164780U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power electronics, and more particularly to a control circuit for a DC-DC converter circuit. Background Technology
[0002] Against the backdrop of the accelerating new energy revolution and electrification, high-reliability power supply systems have become core infrastructure supporting key areas such as smart grids, electric vehicle charging stations, and data centers. Parallel operation of multiple converters is widely adopted due to its advantages such as high redundancy and flexible power expansion; however, the problem of balanced load current distribution (current sharing) remains a technical bottleneck restricting its large-scale application. Traditional droop current sharing control achieves current sharing by locally adjusting the output voltage reference value, eliminating the need for inter-module communication cables and possessing high modularity; however, its inherent defects expose significant limitations in practical applications.
[0003] Traditional droop control relies on output current or inductor current feedback, and introduces a droop slope (R0) to control it. droop This approach forces current balancing between modules, but the output voltage drops linearly with increasing load, making it difficult to meet the stringent voltage accuracy requirements of practical engineering. Gain errors in current sensors, temperature drift of the reference voltage, and resistor aging can lead to increased current sharing errors over long-term operation, threatening system reliability. Furthermore, the control loops between parallel modules are coupled through the output bus impedance, creating crosstalk. When the number of parallel modules is large, the phase margin of traditional control schemes decreases, easily triggering resonance peaks in the mid-frequency range, requiring additional damping circuits to suppress oscillations, increasing complexity and cost.
[0004] Against this backdrop, developing a current sharing control circuit with high current sharing accuracy and low parameter sensitivity has become an urgent need for both academia and industry. Utility Model Content
[0005] This application aims to provide a control circuit for a DC-DC converter circuit, which solves the problems of low current sharing accuracy, parameter sensitivity and dynamic coupling in traditional technologies.
[0006] To achieve the above objectives, the technical solution of this application is as follows:
[0007] A control circuit for a DC-DC converter circuit is provided, connected to the DC-DC converter circuit, the DC-DC converter circuit including: multiple DC-DC converters, the input terminals of the multiple DC-DC converters being connected in parallel; the control circuit for the DC-DC converter circuit includes: a feedback network unit and a controller unit; a first terminal of the feedback network unit is connected to a first terminal of a first terminal of the DC-DC converter circuit, a second terminal of the feedback network unit is connected to a first terminal of the controller unit, and the second terminal of the controller unit outputs a signal acting on the DC-DC converter circuit.
[0008] Optionally, the controller unit includes: a first voltage loop compensator, a second voltage loop compensator, an operational amplifier, and a droop current sharing controller;
[0009] The first terminal of the drooping current equalization controller is the first terminal of the controller unit;
[0010] The first terminal of the first voltage loop compensator is connected to the second terminal of the droop current equalizer;
[0011] The first terminal of the second voltage loop compensator is connected to the second terminal of the first voltage loop compensator.
[0012] The negative input terminal of the operational amplifier is connected to the first terminal of the second voltage loop compensator, the positive input terminal of the operational amplifier is connected to the voltage reference value, and the output terminal of the operational amplifier is connected to the second terminal and the third terminal of the second voltage loop compensator.
[0013] Optionally, the droop current sharing controller includes: a first resistor, a second resistor, and a first capacitor. The first terminal of the first resistor and the first terminal of the first capacitor are connected to form the second terminal of the droop current sharing controller. The second terminal of the first capacitor is connected to the first terminal of the second resistor. The second terminal of the first resistor and the second terminal of the second resistor are connected to form the first terminal of the droop current sharing controller.
[0014] Optionally, the first voltage loop compensator includes: a third resistor, a fourth resistor, and a second capacitor. The first terminals of the third resistor and the fourth resistor are connected to form the third terminal of the first voltage loop compensator. The second terminal of the third resistor is the second terminal of the voltage loop compensator. The second terminal of the fourth resistor is connected to the first terminal of the second capacitor. The second terminal of the second capacitor is the first terminal of the first voltage loop compensator.
[0015] Optionally, the second voltage loop compensator includes: a fifth resistor, a sixth resistor, and a third capacitor. The first terminal of the third capacitor is the first terminal of the second voltage loop compensator. The second terminal of the third capacitor is connected to the first terminal of the sixth resistor. The second terminal of the sixth resistor is both the second terminal and the third terminal of the second voltage loop compensator. The first terminal of the fifth resistor is connected to the first terminal of the third capacitor. The second terminal of the fifth resistor is connected to the second terminal of the sixth resistor.
[0016] Optionally, the controller unit further includes: a two-phase PWM signal generator, the first terminal of which is connected to the third terminal of the second voltage loop compensator, and the second terminal of which is the second terminal of the controller unit.
[0017] Optionally, the controller unit further includes a seventh resistor, the first terminal of which is connected to the midpoint of the series connection between the first terminal of the first voltage loop compensator and the second terminal of the first voltage loop compensator, and the second terminal of the seventh resistor is grounded.
[0018] Optionally, the feedback network unit includes: a low-pass filter, wherein the first terminal of the low-pass filter is the first terminal of the feedback network unit, and the second terminal of the low-pass filter is the second terminal of the feedback network unit.
[0019] Optionally, the control circuit also includes a filter module, the first terminal of which is connected to the first terminal of the second terminal of the DC-DC converter circuit, and the second terminal of which is connected to the third terminal of the first voltage loop compensator.
[0020] Optionally, the filtering module includes: a first inductor and a fourth capacitor; the first terminal of the first inductor is the first terminal of the filtering module, the second terminal of the first inductor is connected to the first terminal of the fourth capacitor, the first terminal of the fourth capacitor is the second terminal of the filtering module, and the second terminal of the fourth capacitor is grounded.
[0021] The control circuit of the DC-DC converter circuit in this application reduces the influence of sensor error and parameter sensitivity by using primary current droop feedback instead of traditional output current or inductor current detection. This improves the stability and reliability of the system in parallel operation. While reducing current sharing error, it also controls the output voltage deviation within a low range, thus solving the contradiction between voltage drop and current sharing.
[0022] By designing a droop current sharing controller to introduce an additional control loop, and utilizing droop gain matching combined with pole placement methods, mutual interference between parallel converters is effectively suppressed, current sharing accuracy is improved, and stability in high dynamic scenarios is ensured.
[0023] Furthermore, this application eliminates the need for inter-module communication lines or master-slave control architecture. It achieves current sharing by adjusting droop commands through voltage injection of localized droop control, supports modular expansion of distributed power systems, saves communication hardware costs, is suitable for scenarios with high reliability requirements, and is compatible with existing voltage-mode control frameworks without the need for additional compensation circuits.
[0024] To make the above features and advantages of this application more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description
[0025] Figure 1 This is a circuit diagram of an embodiment of the control circuit of the DC-DC converter circuit proposed in this application.
[0026] In the accompanying drawings, similar reference numerals refer to the same elements. Detailed Implementation
[0027] To make the objectives and technical solutions of the embodiments of this application clearer, 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, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.
[0028] This application provides a control circuit 2 for a DC-DC converter circuit, which is connected to a DC-DC converter circuit 1. The control circuit 2 is used to control the DC-DC converter circuit 1. The DC-DC converter circuit 1 includes a plurality of DC-DC converters, specifically including DC-DC converter 11-DC-DC converter 1i, and the input terminals of the plurality of DC-DC converters are connected in parallel.
[0029] Please see Figure 1 The control circuit 2 of the DC-DC converter circuit proposed in this application includes:
[0030] Feedback network unit 21 and controller unit 22; the first terminal of feedback network unit 21 is connected to the first terminal of the first end of DC-DC converter circuit 1, the second terminal of feedback network unit 21 is connected to the first terminal of controller unit 22, and the output signal of the second terminal of controller unit 22 acts on DC-DC converter circuit 1.
[0031] As an example, the feedback network unit 21 includes a low-pass filter 211, the first terminal of the low-pass filter 211 being the first terminal of the feedback network unit 21, and the second terminal of the low-pass filter 211 being the second terminal of the feedback network unit 21.
[0032] As an example, controller unit 22 includes: voltage loop compensator 222, voltage loop compensator 223, operational amplifier A, and droop current sharing controller 221;
[0033] The first terminal of the drooping current equalization controller 221 is the first terminal of the controller unit 22;
[0034] The first terminal of the voltage loop compensator 222 is connected to the second terminal of the droop current equalizer 221;
[0035] The first terminal of voltage loop compensator 223 is connected to the second terminal of voltage loop compensator 222;
[0036] The negative input terminal of operational amplifier A is connected to the first terminal of voltage loop compensator 223, and the positive input terminal of operational amplifier A is connected to the voltage reference value V. refThe output terminal of operational amplifier A is connected to the second terminal and the third terminal of voltage loop compensator 223.
[0037] As an example, the controller unit 22 may also include: a two-phase PWM (pulse width modulation) signal generator 224, the first terminal of the two-phase PWM signal generator 224 being connected to the third terminal of the voltage loop compensator 223, the second terminal of the two-phase PWM signal generator 224 being the second terminal of the controller unit 22, and outputting two-phase PWM signals to act on the DC-DC converter circuit 1.
[0038] As an example, the controller unit 22 may also include: a resistor R1, the first terminal of which is connected to the midpoint of the series connection between the first terminal of the voltage loop compensator 222 and the second terminal of the voltage loop compensator 222, and the second terminal of the resistor R1 is grounded.
[0039] The control circuit 2 of the DC-DC converter circuit provided in this application may further include a filter module 23. The first terminal of the filter module 23 is connected to the first terminal of the second terminal of the DC-DC converter circuit 1, and the second terminal of the filter module 23 is connected to the third terminal of the controller unit 22.
[0040] As an example, the filter module 23 includes: an inductor L and a capacitor C; the first terminal of the inductor L is the first terminal of the filter module 23, the second terminal of the inductor L is connected to the first terminal of the capacitor C, the first terminal of the capacitor C is the second terminal of the filter module 23, and the second terminal of the capacitor C is grounded.
[0041] As an example, the filter module 23 may also include: a diode D4 and a resistor R, wherein the cathode of the diode D4 is connected to the first terminal of the inductor L, the anode of the diode D4 is grounded, the first terminal of the resistor R is connected to the second terminal of the inductor L, and the second terminal of the resistor R is grounded.
[0042] As an example, DC-DC converters 11 to 1i each include: a switching transistor Q1, a switching transistor Q2, a diode D1, a diode D2, and a transformer T. The transformer T includes a primary winding N1 and a secondary winding N2. The first terminal of the switching transistor Q1 is connected to one end of the power supply, the second terminal of the switching transistor Q1 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the other end of the power supply. The anode of each diode D2 is connected to the first terminal of the first terminal of the DC-DC converter circuit 1, and the cathode of the diode D1 is connected to the switching transistor Q1. The first terminal of DC-DC converter 1 is connected to the first terminal of the diode D1, the second terminal of the diode Q2 is connected to the anode of the diode D2, the first terminal of the primary winding N1 is connected to the midpoint of the series connection between the diode Q1 and the diode D2, the second terminal of the primary winding N1 is connected to the midpoint of the series connection between the diode Q2 and the diode D2, the first terminal of each secondary winding N2 is connected to the first terminal of the second terminal of DC-DC converter 1, the second terminal of the secondary winding N2 is connected to the cathode of the diode D2, and the anode of the diode D2 is grounded.
[0043] As an example, the voltage loop compensator 222 includes: resistor R2, resistor R3, and capacitor C1. The first terminals of resistor R2 and resistor R3 are connected to the third terminal of the voltage loop compensator 222, which is also the third terminal of the controller unit 22. The second terminal of resistor R2 is the second terminal of the voltage loop compensator 222, and the second terminal of resistor R3 is connected to the first terminal of capacitor C1, which is also the first terminal of the voltage loop compensator 222.
[0044] As an example, the voltage loop compensator 223 includes: resistor R4, resistor R5, and capacitor C2. The first terminal of capacitor C2 is the first terminal of voltage loop compensator 223, the second terminal of capacitor C2 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is the second terminal and the third terminal of voltage loop compensator 223, the first terminal of resistor R4 is connected to the first terminal of capacitor C2, and the second terminal of resistor R4 is connected to the second terminal of resistor R5.
[0045] As an example, the droop current sharing controller 221 includes: resistor R6, resistor R7, and capacitor C3. The first terminal of resistor R6 and the first terminal of capacitor C3 are connected to form the second terminal of the droop current sharing controller 221. The second terminal of capacitor C3 is connected to the first terminal of resistor R7. The second terminal of resistor R6 and the second terminal of resistor R7 are connected to form the first terminal of the droop current sharing controller 221.
[0046] As an example, in the parallel DC-DC converter circuit 1, the duty cycle disturbance of each converter is a combination of two parts: local control generation and other DC-DC converter effects.
[0047] Taking the i-th DC-DC converter as an example, in the local control, the i-th DC-DC converter calculates the output voltage error and adjusts the duty cycle d through the voltage loop compensator 222 and the droop current sharing controller 221. i Adjust the output voltage V o Steady-state accuracy ensures that the output current I o Balanced distribution. Duty cycle d i It is expressed as follows:
[0048] d i =G c1 (s)·G dr (s)(V ref -V o )
[0049] Among them, G dr (s) represents the transfer function of the drooping current sharing controller 221, G c1 (s) represents the transfer function of the voltage loop compensator 222, V ref Indicates the reference voltage, V o This indicates the output voltage.
[0050] The transfer function G of voltage loop compensator 222 c1 (s) is represented as:
[0051]
[0052] Where Kp represents the adjusted proportional gain, Ki represents the integral gain, and s represents the Laplace transform variable.
[0053] In the influence of other DC-DC converters, the duty cycle d of the i-th DC-DC converter i Through the current cross-transfer function F dk (s) It affects the primary-side current of other DC-DC converters, and the duty cycle dk generates a compensation term to offset current crosstalk. k It is expressed as follows:
[0054] d k =F dk (s)·I ini
[0055] Among them, I ini This represents the primary current of the i-th DC-DC converter.
[0056] Current cross-transfer function F dk (s) is represented as:
[0057]
[0058] Among them, Kdk To compensate for the gain, the strength of the droop control is adjusted and is inversely proportional to the cross-coupling impedance. It is designed based on the cross-coupling impedance Zcross to ensure attenuation of the interference current after compensation; T dk The time constant is used to suppress high-frequency noise and is related to the output filter cutoff frequency w. f match.
[0059] Compensation gain K dk Represented as:
[0060]
[0061] Time constant T dk Represented as:
[0062]
[0063] The following will continue to combine Figure 1 This paper describes the working principle of this application.
[0064] The two-phase PWM signal generator 224 collects the input voltage V. in With primary current I in PWM regulation is performed to convert DC power into two-phase PWM signals, which are then input to DC-DC converters 11 to 1i to control the on and off times of switching transistors Q1 and Q2, thereby changing the duty cycle d of the i-th DC-DC converter. i .
[0065] As an example, the duty cycle d in the i-th DC-DC converter i For the output voltage v o The impact is expressed as:
[0066]
[0067] Among them, F di (s) represents the duty cycle d i to output voltage v o The transfer function; s represents the Laplace transform variable.
[0068] DC-DC converters 11 to 1i convert the input voltage V based on the two-phase PWM signal. in With primary current I in Voltage transformation is achieved by coupling the transformer T to the secondary side.
[0069] The inductor L and capacitor C filter the output signals of DC-DC converters 11 to 1i, removing high-frequency ripple components and forming a stable output voltage V. o With output current I o .
[0070] Resistors R1, R2, and R3 form a weighted resistor network that affects the output voltage V. o Perform voltage divider sampling to obtain a value related to the output voltage V. o A proportional voltage feedback signal.
[0071] As an example, the output impedance Z out (s) represents the effect of load change on the output voltage v o The disturbance is represented as:
[0072]
[0073] Where H(s) represents the output impedance Z out (s).
[0074] Low-pass filter 211 receives primary current I in Suppressing high-frequency switching noise to extract a smooth current signal I in,filtered The transfer function of the low-pass filter 211 is expressed as:
[0075]
[0076] Among them, G f (s) represents the transfer function of the low-pass filter 211, w f Indicates the cutoff frequency.
[0077] Extract the smoothed current signal I in,filtered , is represented as:
[0078] I in,filtered =G f (s)·I in .
[0079] As an example, the droop current sharing controller 221 is based on a smoothed current signal I. in,filtered Generate droop voltage command V droop Superimposed on the reference voltage V ref A dynamically adjusted synthetic reference voltage is formed. The transfer function of the droop current sharing controller 221 is expressed as:
[0080]
[0081] Among them, G dr (s) represents the transfer function of the drooping current sharing controller 221, G c2 (s) represents the transfer function of the voltage loop compensator 223, k d This represents the proportionality coefficient.
[0082] Generate droop voltage command V droop , is represented as:
[0083] V droop =G dr (s)·I in,filtered =k d ·G c2 (s)·G f (s)·I in
[0084] Voltage loop compensators 222 and 223, along with operational amplifier A, constitute a two-stage compensation network. Operational amplifier A receives the voltage feedback signal, compares it with the synthesized reference voltage to obtain the voltage deviation signal, and inputs it to voltage loop compensator 223. Voltage loop compensator 223 compensates and amplifies the voltage deviation signal, and voltage loop compensators 222 and 223 generate a control signal V. c Input to a two-phase PWM signal generator 224, the modulation gain K of the two-phase PWM signal generator 224 is converted to control signal V. c Duty cycle d i Stable output voltage V o The transfer function of voltage loop compensator 223 is expressed as:
[0085]
[0086] Among them, G c2 (s) represents the transfer function of the voltage loop compensator 223, w z1 This indicates the zero point of the voltage loop compensator 222, w z2 This indicates the zero point of the voltage loop compensator 223, used to suppress resonance peaks; w p1 The poles of voltage loop compensator 222 are represented by w. p2 The poles of voltage loop compensator 223 are indicated to limit bandwidth and high-frequency noise. A pole placement scheme is used to design voltage loop compensators 222 and 223, ensuring circuit stability under specified bandwidth and phase margin. The dynamic response is optimized and the impact of parameter variations is reduced through the reasonable allocation of zeros and poles.
[0087] As an example, the contribution of the droop control of the voltage loop compensator 223 and the droop current sharing controller 221 to the system loop gain is expressed as follows:
[0088] T droop =G dr (s)·G f (s)·F di (s)
[0089] Among them, T droopThis refers to droop gain. Droop gain matching suppresses mutual interference between parallel converters. When there is cross-coupling between parallel converters, droop gain matching enables the controller unit to effectively suppress interference signals, ensuring the stable operation of each circuit and module, improving current sharing accuracy, and ensuring that the entire circuit can work reliably under complex operating conditions.
[0090] Taking the i-th DC-DC converter as an example, its working process is as follows:
[0091] During the operation of the parallel DC-DC converter, the output voltage v o The voltage feedback signal is obtained by sampling through the transfer function H(s), and the voltage feedback signal is compared with the reference voltage V. ref A comparison is made to obtain an error signal. The error signal is then passed through voltage loop compensators 222 and 223 according to the control signal V. c Compensation is performed with the modulation gain K to generate the duty cycle d of the i-th DC-DC converter. i Current cross-transfer function F dk (s) Processing primary current I ini By compensating for the duty cycle d k To suppress mutual interference between parallel DC-DC converters; the i-th DC-DC converter obtains the primary current I based on the duty cycle of the two switches. ini Primary current I ini After passing through the low-pass filter 211 to remove high-frequency switching noise, the primary current signal is obtained and then used by the droop current sharing controller 221 to generate the droop voltage command V. droop Superimposed on the reference voltage V ref Dynamically adjust duty cycle d i This forces the primary-side currents of the i-th DC-DC converter and the j-th DC-DC converter to be balanced.
[0092] Throughout the control process, the droop current sharing controller 221 and the voltage loop compensator 223 are matched by the droop gain T. droop =T v ΔW suppresses mutual interference between parallel DC-DC converters caused by factors such as output bus impedance coupling.
[0093] Among them, T v ΔW represents the gain of voltage loop compensators 222 and 223, and ΔW represents the degree of influence of droop control on the gain of voltage loop compensators 222 and 223.
[0094] As an example, the type of DC power supply on the primary side of the DC-DC converter described in this application may vary depending on the specific application method, scenario, or field.
[0095] As an example, a DC-DC converter includes an interleaved two-transistor forward converter.
[0096] As an example, the switching transistors Q1 and Q2 include, but are not limited to, MOSFETs. Depending on the actual application requirements, IGBTs, SiCs, etc. can also be selected. The specific embodiments described above are only used to explain the relevant utility models and are not intended to limit the selection of this utility model.
[0097] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0098] The control circuit of the DC-DC converter circuit in this application reduces the influence of sensor error and parameter sensitivity by using primary-side current droop feedback instead of traditional output current or inductor current detection. This improves the stability and reliability of the system in parallel operation. While reducing current sharing error, it also controls the output voltage deviation within a low range, thus solving the contradiction between voltage drop and current sharing.
[0099] By designing a droop current sharing controller 221 to introduce an additional control loop, and utilizing droop gain matching combined with pole placement method, mutual interference between parallel converters is effectively suppressed, current sharing accuracy is improved, and stability in high dynamic scenarios is ensured.
[0100] Furthermore, this application eliminates the need for inter-module communication lines or master-slave control architecture. It achieves current sharing by adjusting droop commands through voltage injection of localized droop control, supports modular expansion of distributed power systems, saves communication hardware costs, is suitable for scenarios with high reliability requirements, and is compatible with existing voltage-mode control frameworks without the need for additional compensation circuits.
[0101] The above description is merely a preferred embodiment of this application and an explanation and description of the technical principles used. This explanation and description are not restrictive, and the figures shown are only one embodiment of this utility model; the actual structure is not limited to this. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features without departing from the concept of this application. For example, technical solutions formed by substituting the above-mentioned features with, but not limited to, technical features with similar functions disclosed in this application. Therefore, if those skilled in the art are inspired by this and design similar structural methods and embodiments without departing from the inventive spirit of this utility model, they should all fall within the protection scope of this utility model.
Claims
1. A control circuit for a DC-DC converter circuit, connected to the DC-DC converter circuit, the DC-DC converter circuit comprising: Multiple DC-DC converters, with their input terminals connected in parallel; characterized in that it includes: a feedback network unit and a controller unit; the first terminal of the feedback network unit is connected to the first terminal of the first terminal of the DC-DC converter circuit, the second terminal of the feedback network unit is connected to the first terminal of the controller unit, and the output signal of the second terminal of the controller unit acts on the DC-DC converter circuit.
2. The control circuit of the DC-DC converter circuit as described in claim 1, characterized in that, The controller unit includes: a first voltage loop compensator, a second voltage loop compensator, an operational amplifier, and a droop current sharing controller; The first terminal of the drooping current equalization controller is the first terminal of the controller unit; The first terminal of the first voltage loop compensator is connected to the second terminal of the droop current equalizer; The first terminal of the second voltage loop compensator is connected to the second terminal of the first voltage loop compensator. The negative input terminal of the operational amplifier is connected to the first terminal of the second voltage loop compensator, the positive input terminal of the operational amplifier is connected to the voltage reference value, and the output terminal of the operational amplifier is connected to the second terminal and the third terminal of the second voltage loop compensator.
3. The control circuit of the DC-DC converter circuit as described in claim 2, characterized in that, The droop current sharing controller includes: a first resistor, a second resistor, and a first capacitor. The first terminal of the first resistor and the first terminal of the first capacitor are connected to form the second terminal of the droop current sharing controller. The second terminal of the first capacitor is connected to the first terminal of the second resistor. The second terminal of the first resistor and the second terminal of the second resistor are connected to form the first terminal of the droop current sharing controller.
4. The control circuit of the DC-DC converter circuit as described in claim 2, characterized in that, The first voltage loop compensator includes: a third resistor, a fourth resistor, and a second capacitor. The first terminals of the third resistor and the fourth resistor are connected to form the third terminal of the first voltage loop compensator. The second terminal of the third resistor is the second terminal of the voltage loop compensator. The second terminal of the fourth resistor is connected to the first terminal of the second capacitor. The second terminal of the second capacitor is the first terminal of the first voltage loop compensator.
5. The control circuit of the DC-DC converter circuit as described in claim 2, characterized in that, The second voltage loop compensator includes: a fifth resistor, a sixth resistor, and a third capacitor. The first terminal of the third capacitor is the first terminal of the second voltage loop compensator. The second terminal of the third capacitor is connected to the first terminal of the sixth resistor. The second terminal of the sixth resistor is the second terminal of the second voltage loop compensator and the third terminal of the second voltage loop compensator. The first terminal of the fifth resistor is connected to the first terminal of the third capacitor. The second terminal of the fifth resistor is connected to the second terminal of the sixth resistor.
6. The control circuit of the DC-DC converter circuit as described in claim 2, characterized in that, The controller unit also includes a two-phase PWM signal generator, the first terminal of which is connected to the third terminal of the second voltage loop compensator, and the second terminal of which is the second terminal of the controller unit.
7. The control circuit of the DC-DC converter circuit as described in claim 2, characterized in that, The controller unit also includes a seventh resistor, the first terminal of which is connected to the midpoint of the series connection between the first terminal of the first voltage loop compensator and the second terminal of the first voltage loop compensator, and the second terminal of the seventh resistor is grounded.
8. The control circuit of the DC-DC converter circuit as described in claim 1, characterized in that, The feedback network unit includes a low-pass filter, the first terminal of which is the first terminal of the feedback network unit, and the second terminal of which is the second terminal of the feedback network unit.
9. The control circuit of the DC-DC converter circuit as described in claim 1, characterized in that, The control circuit also includes a filter module. The first terminal of the filter module is connected to the first terminal of the second terminal of the DC-DC converter circuit, and the second terminal of the filter module is connected to the third terminal of the first voltage loop compensator.
10. The control circuit of the DC-DC converter circuit as described in claim 9, characterized in that, The filtering module includes: a first inductor and a fourth capacitor; the first terminal of the first inductor is the first terminal of the filtering module, the second terminal of the first inductor is connected to the first terminal of the fourth capacitor, the first terminal of the fourth capacitor is the second terminal of the filtering module, and the second terminal of the fourth capacitor is grounded.