Dynamic control circuit, dynamic control method thereof and power supply system

Abstract

The invention provides a dynamic control circuit, a dynamic control method thereof and a power supply system. The dynamic control circuit comprises a comparison signal generation circuit, a comparison circuit and a dynamic mode control circuit. The comparison signal generation circuit is used for performing signal processing according to an input voltage sampling signal to generate a first comparison signal. The input end of the comparison circuit is coupled with the output end of the comparison signal generation circuit, and the comparison circuit is used for comparing the first comparison signal with the second comparison signal and generating a dynamic control signal. When the absolute value of the difference between the first comparison signal and the second comparison signal is larger than a preset threshold value, the dynamic control signal is in a first state. The input end of the dynamic mode control circuit is coupled with the output end of the comparison circuit, and the dynamic mode control circuit is used for controlling the bandwidth of the power system according to the dynamic control signal. According to the dynamic control circuit, the dynamic control method thereof and the power supply system, the dynamic performance of the power supply system is optimized, and meanwhile it is guaranteed that steady-state work of the system is not affected.

Description

Technical Field

[0001] The present invention belongs to the field of power electronics and relates to a dynamic control circuit and a dynamic control method thereof and a power supply system. Background Art

[0002] For constant voltage systems, in order to achieve a constant voltage output, a commonly used feedback method is to directly sample the output voltage of the constant voltage system as a feedback signal, and control the on / off state of the main switch of the constant voltage system based on the feedback signal and the reference signal. When the load or input changes dynamically, the output voltage of the constant voltage system may change. The dynamic state can be determined by whether the change in the output voltage feedback of the constant voltage system exceeds a certain amplitude, so that a corresponding dynamic response can be made. For constant current systems, the inductor current or the output current of the constant current system is usually detected as a feedback signal. When the load or input changes dynamically, the output current feedback is detected to determine whether the dynamic state may cause the light to flash. This is because there may be problems such as the absolute value of the output current change being too small to be detected, resulting in an inability to enter a dynamic response, or there may be a certain lag in the dynamic response adjustment, resulting in the output current change exceeding the set threshold.

[0003] In some application scenarios, taking the backlight system as an example, there are two outputs. For example, one is a 12V constant voltage load and the other is a constant current load. When the 12V constant voltage load changes, such as Figure 1 As shown, the input voltage Vin of the constant current load will also change accordingly. At this time, the compensation voltage Vcomp of the constant current system needs to change. This change process will cause the output current Io to change, causing flickering. Therefore, it is necessary to speed up the adjustment speed of the compensation voltage Vcomp when dynamic conditions occur. However, when the absolute value of the output current change is small, especially when the dimming current is small, it is difficult to determine whether dynamic conditions have occurred by detecting the system's output current change. In one existing technical solution, the overall system steady-state loop speed is designed to be faster. This will accelerate the adjustment speed of the compensation voltage Vcomp during system dynamic conditions, reducing the output current change amplitude and change time. However, excessively fast system steady-state loop speed may lead to other problems such as unstable steady-state operation and overshoot at startup.

[0004] In view of this, it is necessary to provide a new structure or control method to solve at least part of the above problems. Summary of the Invention

[0005] In response to one or more problems in the prior art, the present invention proposes a dynamic control circuit, a dynamic control method thereof, and a power supply system.

[0006] According to one aspect of the present invention, a dynamic control circuit is disclosed, the dynamic control circuit comprising:

[0007] A comparison signal generating circuit, whose input terminal is used to receive an input voltage sampling signal, and is used to perform signal processing according to the input voltage sampling signal to generate a first comparison signal;

[0008] a comparison circuit, whose input terminal is coupled to the output terminal of the comparison signal generating circuit, for comparing the first comparison signal and the second comparison signal and generating a dynamic control signal; when the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state; and

[0009] The dynamic mode control circuit has an input terminal coupled to the output terminal of the comparison circuit and is used to control the power system bandwidth according to the dynamic control signal. When the dynamic control signal is in a first state, the power system bandwidth is increased.

[0010] In one embodiment, when the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit gradually reduces the power system bandwidth to a preset bandwidth within a preset time, where the preset bandwidth is the bandwidth when the power system is in a steady state.

[0011] In one embodiment, when the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit reduces the power system bandwidth to a preset bandwidth at every preset time interval, where the preset bandwidth is the bandwidth when the power system is in a steady state.

[0012] In one embodiment, the comparison signal generating circuit is used to perform signal processing based on the input voltage sampling signal to generate a first comparison signal and a second comparison signal with different change speeds; or, the comparison signal generating circuit is used to perform signal processing based on the input voltage sampling signal to generate a first comparison signal, and the second comparison signal is a preset value.

[0013] In one embodiment, the comparison signal generating circuit includes a filtering circuit or a differentiating circuit.

[0014] In one embodiment, the filtering circuit includes:

[0015] a first filtering circuit comprising a first resistor and a first capacitor, wherein a first end of the first resistor is coupled to an input voltage sampling signal, a first end of the first capacitor is coupled to a second end of the first resistor, and a second end of the first capacitor is coupled to ground; and

[0016] The second filter circuit includes a second resistor and a second capacitor. The first end of the second resistor is coupled to the input voltage sampling signal. The first end of the second capacitor is coupled to the second end of the second resistor. The second end of the second capacitor is coupled to the ground.

[0017] In one embodiment, the differential circuit includes a third capacitor and a third resistor, wherein the first end of the third capacitor is coupled to the input voltage sampling signal, the first end of the third resistor is coupled to the second end of the third capacitor, and the second end of the third resistor is coupled to the ground.

[0018] In one embodiment, the comparison circuit includes a first comparison circuit, a second comparison circuit and an OR gate; the first input terminal of the first comparison circuit is coupled to the negative pole of the first power supply, the positive pole of the first power supply is coupled to the first end of the second capacitor, and the second input terminal of the first comparison circuit is coupled to the first end of the first capacitor; the first input terminal of the second comparison circuit is coupled to the first end of the first capacitor, the second input terminal of the second comparison circuit is coupled to the positive pole of the second power supply, and the negative pole of the second power supply is coupled to the positive pole of the second capacitor; the first input terminal of the OR gate is coupled to the output terminal of the first comparison circuit, the second input terminal of the OR gate is coupled to the output terminal of the second comparison circuit, and the output terminal of the OR gate outputs a dynamic control signal.

[0019] In one embodiment, the comparison circuit includes a first comparison circuit, a second comparison circuit and an OR gate; the first input terminal of the first comparison circuit is coupled to the negative terminal of the third power supply, the positive terminal of the third power supply is coupled to the ground, and the second input terminal of the first comparison circuit is coupled to the second terminal of the third capacitor; the first input terminal of the second comparison circuit is coupled to the second terminal of the third capacitor, the second input terminal of the second comparison circuit is coupled to the positive terminal of the fourth power supply, and the negative terminal of the fourth power supply is coupled to the ground; the first input terminal of the OR gate is coupled to the output terminal of the first comparison circuit, the second input terminal of the OR gate is coupled to the output terminal of the second comparison circuit, and the output terminal of the OR gate outputs a dynamic control signal.

[0020] According to another aspect of the present invention, a power supply system is disclosed. The power supply system includes the dynamic control circuit as described in any one of the above items. The power supply system is a constant voltage system, a constant current system, or a constant voltage constant current system.

[0021] According to another aspect of the present invention, a dynamic control method is disclosed, the dynamic control method comprising:

[0022] receiving an input voltage sampling signal, and performing signal processing according to the input voltage sampling signal to generate a first comparison signal;

[0023] comparing the first comparison signal and the second comparison signal and generating a dynamic control signal; when the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state; and

[0024] The power system bandwidth is controlled according to the dynamic control signal, and when the dynamic control signal is in a first state, the power system bandwidth is increased.

[0025] In one embodiment, the step of controlling the power supply system bandwidth according to the dynamic control signal also includes: when the dynamic control signal changes from the first state to the second state, gradually reducing the power supply system bandwidth to a preset bandwidth within a preset time, and the preset bandwidth is the bandwidth when the power supply system is in a steady state.

[0026] In one embodiment, the step of controlling the power system bandwidth according to the dynamic control signal further includes: when the dynamic control signal changes from the first state to the second state, reducing the power system bandwidth to a preset bandwidth at every preset time interval, where the preset bandwidth is the bandwidth when the power system is in a steady state.

[0027] In one embodiment, the step of performing signal processing on the input voltage sampling signal to generate the first comparison signal includes:

[0028] Signal processing is performed on the input voltage sampling signal to generate a first comparison signal and a second comparison signal with different change speeds; or, signal processing is performed on the input voltage sampling signal to generate a first comparison signal and provide a second comparison signal, wherein the second comparison signal is a preset value.

[0029] The present invention provides a dynamic control circuit, a dynamic control method, and a power supply system. The dynamic control circuit includes a comparison signal generation circuit, a comparison circuit, and a dynamic mode control circuit. The input of the comparison signal generation circuit is configured to receive an input voltage sampling signal, and the comparison signal generation circuit is configured to perform signal processing based on the input voltage sampling signal to generate a first comparison signal. The input of the comparison circuit is coupled to the output of the comparison signal generation circuit, and the comparison circuit is configured to compare the first comparison signal with a second comparison signal and generate a dynamic control signal. When the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state. The input of the dynamic mode control circuit is coupled to the output of the comparison circuit, and the dynamic mode control circuit is configured to control the bandwidth of the power supply system based on the dynamic control signal. When the dynamic control signal is in the first state, the bandwidth of the power supply system is increased. The present invention provides a dynamic control circuit, a dynamic control method, and a power supply system, which optimize the dynamic performance of the power supply system while ensuring that the steady-state operation of the system is not affected. This effectively addresses existing issues such as excessively fast steady-state loop speed, which can lead to unstable steady-state operation and overshoot during startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and, together with the description, to explain the embodiments of the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of signal waveforms of a power supply system in the prior art is shown;

[0032] Figure 2 FIG2 shows a circuit structure diagram of a dynamic control circuit according to an embodiment of the present invention;

[0033] Figure 3 A partial circuit structure diagram of a dynamic control circuit according to an embodiment of the present invention is shown;

[0034] Figure 4 A partial circuit structure diagram of another dynamic control circuit according to an embodiment of the present invention is shown;

[0035] Figure 5 A schematic diagram of signal waveforms of a dynamic control circuit according to an embodiment of the present invention is shown;

[0036] Figure 6 FIG. 4 is a schematic diagram showing signal waveforms of a dynamic control circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0038] The description in this section focuses on a few typical embodiments, and the present invention is not limited to the scope of the embodiments described. Combinations of different embodiments, replacement of certain technical features in different embodiments, and replacement of certain technical features in the embodiments with the same or similar prior art methods are also within the scope of the present invention.

[0039] The term "coupling" or "connection" in the specification includes both direct connection and indirect connection. Indirect connection refers to connection through an intermediate medium, such as connection through an electrically conductive medium such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or connection through an intermediate circuit or component as described in the embodiments in the specification; indirect connection may also include connection through other active or passive devices on the basis of achieving the same or similar functions, such as connection through circuits or components such as switches, signal amplification circuits, and follower circuits. "Multiple" or "many" means two or more. In addition, in the present invention, words such as first and second are mainly used to distinguish one technical feature from another, and do not necessarily require or imply the existence of a certain actual relationship or order between these technical features.

[0040] One embodiment of the present invention discloses a dynamic control circuit, such as Figure 2As shown, the dynamic control circuit includes a comparison signal generating circuit 10, a comparison circuit 20 and a dynamic mode control circuit 30. The input end of the comparison signal generating circuit 10 is used to receive an input voltage sampling signal, and the comparison signal generating circuit 10 is used to perform signal processing according to the input voltage sampling signal to generate a first comparison signal. The input voltage sampling signal is positively correlated with the input voltage. In one embodiment, the input voltage sampling signal is equal to the input voltage Vin. In another embodiment, the input voltage sampling signal is proportional to the input voltage. Figure 2 As shown, the input end of the comparison circuit 20 is coupled to the output end of the comparison signal generating circuit 10, and the comparison circuit 20 is used to compare the first comparison signal and the second comparison signal and generate a dynamic control signal. When the absolute value of the difference between the first comparison signal and the second comparison signal is greater than the preset threshold, the dynamic control signal output by the comparison circuit 20 is in a first state (for example, a high level). When the absolute value of the difference between the first comparison signal and the second comparison signal is not greater than the preset threshold, the dynamic control signal output by the comparison circuit 20 is in a second state (for example, a low level). The input end of the dynamic mode control circuit 30 is coupled to the output end of the comparison circuit 20, and the dynamic mode control circuit 30 is used to control the bandwidth of the power supply system according to the dynamic control signal. When the dynamic control signal is in the first state, the bandwidth of the power supply system is increased. The present invention proposes a dynamic control circuit that can effectively optimize the dynamic performance of the power supply system while ensuring that the steady-state operation of the system is not affected.

[0041] The specific implementation methods for the comparison signal generation circuit 10 to generate the first comparison signal by performing signal processing based on the input voltage sampling signal can be diverse. In one embodiment, the comparison signal generation circuit includes a filtering circuit, which generates the first comparison signal after filtering the input voltage sampling signal. In another embodiment, the comparison signal generation circuit includes a differentiating circuit, which generates the first comparison signal after differentiating the input voltage sampling signal. Those skilled in the art can also, based on specific circuit requirements, use alternative embodiments in which the comparison signal generation circuit includes a signal processing circuit for detecting the dynamics of the input voltage, which generates the first comparison signal after performing signal processing based on the input voltage sampling signal.

[0042] In one embodiment, the dynamic control circuit includes a comparison signal generating circuit, a comparison circuit, and a dynamic mode control circuit. The comparison signal generating circuit includes a filtering circuit. The comparison signal generating circuit generates a first comparison signal and a second comparison signal with different change speeds through two filtering processing methods according to the input voltage sampling signal. The filtering circuit includes a first filtering circuit and a second filtering circuit. Figure 3As shown, the first filter circuit includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is coupled to the input voltage sampling signal VIN. The first end of the first capacitor C1 is coupled to the second end of the first resistor R1, and the second end of the first capacitor C1 is coupled to ground. The second filter circuit includes a second resistor R2 and a second capacitor C2. The first end of the second resistor R1 is coupled to the input voltage sampling signal VIN. The first end of the second capacitor C2 is coupled to the second end of the second resistor R1, and the second end of the second capacitor C2 is coupled to ground.

[0043] like Figure 3 As shown, the comparison circuit includes a first comparison circuit 201, a second comparison circuit 202, and an OR gate. The non-inverting input terminal of the first comparison circuit 201 is coupled to the negative electrode of the first power supply Vth1, and the positive electrode of the first power supply Vth1 is coupled to the first terminal of the second capacitor C2. The inverting input terminal of the first comparison circuit 201 is coupled to the first terminal of the first capacitor C1. The voltage drop between the positive and negative electrodes of the first power supply Vth1 is Vth1. The non-inverting input terminal of the second comparison circuit 202 is coupled to the first terminal of the first capacitor C1, the inverting input terminal of the second comparison circuit 202 is coupled to the positive electrode of the second power supply Vth2, and the negative electrode of the second power supply Vth2 is coupled to the positive electrode of the second capacitor C2. The voltage drop between the positive and negative electrodes of the second power supply Vth2 is Vth2. The first comparison circuit 201 outputs a first comparison result signal VINDYN_DOWN, and the second comparison circuit 202 outputs a second comparison result signal VINDYN_UP. A first input of the OR gate is coupled to the output of the first comparison circuit 201 to receive the first comparison result signal VINDYN_DOWN. A second input of the OR gate is coupled to the output of the second comparison circuit 202 to receive the second comparison result signal VINDYN_UP. An output of the OR gate outputs the dynamic control signal VINDYN.

[0044] In another embodiment, the dynamic control circuit includes a comparison signal generating circuit, a comparison circuit, and a dynamic mode control circuit. Figure 4As shown, the comparison signal generation circuit includes a differential circuit. The comparison signal generation circuit performs differential processing based on the input voltage sampling signal to generate a first comparison signal, and the second comparison signal is a preset value. The differential circuit includes a third capacitor C3 and a third resistor R3. The first end of the third capacitor C3 is coupled to the input voltage sampling signal VIN. The first end of the third resistor R3 is coupled to the second end of the third capacitor C3, and the second end of the third resistor R3 is coupled to ground. The comparison circuit includes a first comparison circuit 211, a second comparison circuit 212, and an OR gate. The non-inverting input of the first comparison circuit 211 is coupled to the negative electrode of the third power supply Vth3, and the positive electrode of the third power supply Vth3 is coupled to ground. The voltage drop between the positive and negative electrodes of the third power supply Vth3 is Vth3. The inverting input of the first comparison circuit 211 is coupled to the second end of the third capacitor C3. The non-inverting input of the second comparison circuit 212 is coupled to the second end of the third capacitor C3, and the inverting input of the second comparison circuit 212 is coupled to the positive electrode of the fourth power supply Vth4, and the negative electrode of the fourth power supply Vth4 is coupled to ground. The voltage drop between the positive and negative electrodes of the fourth power supply Vth4 is Vth4. The first comparison circuit 211 outputs a first comparison result signal VINDYN_DOWN, and the second comparison circuit 212 outputs a second comparison result signal VINDYN_UP. A first input terminal of the OR gate is coupled to the output terminal of the first comparison circuit 211 to receive the first comparison result signal VINDYN_DOWN. A second input terminal of the OR gate is coupled to the output terminal of the second comparison circuit 212 to receive the second comparison result signal VINDYN_UP. The output terminal of the OR gate outputs the dynamic control signal VINDYN.

[0045] In one embodiment, when the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit gradually reduces the power system bandwidth within a preset time until the power system bandwidth is reduced to a preset bandwidth. The preset bandwidth is the bandwidth when the power system is in a steady state, thereby improving the dynamic performance and stability of the power system.

[0046] In another embodiment, when the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit reduces the power system bandwidth at every preset time interval until the power system bandwidth is reduced to a preset bandwidth, where the preset bandwidth is the bandwidth when the power system is in a steady state.

[0047] The implementation principle of the present invention is based on detecting whether the input voltage changes. If the input voltage changes, it is determined that a dynamic state has occurred, and the power supply system enters the dynamic mode. The dynamic control circuit speeds up the bandwidth of the power supply system. If the input voltage does not change or the change does not exceed the threshold, the bandwidth of the power supply system remains unchanged. This will not affect the steady-state performance of the system. At the same time, it can enter the dynamic mode in time when the input voltage changes, speed up the loop speed so that the compensation voltage Vcomp reaches a steady state faster, reduce the output current change amplitude and duration caused by the input voltage change, and thus reduce the degree of light flicker. In one embodiment, combined with Figure 3 and Figure 5 The comparison signal generating circuit generates a first comparison signal VIN1 (for which the change speed is different) with different change speeds through two filtering processing modes according to the input voltage sampling signal VIN. Figure 5 solid line) and the second comparison signal VIN2 ( Figure 5 dotted line in the middle). When the input voltage changes, the corresponding input voltage sampling signal is passed through different RC filter circuits to generate two voltage signals with different change speeds, namely the first comparison signal VIN1 and the second comparison signal VIN2. When the absolute value of the difference between the two voltages exceeds the preset threshold, it is determined that the input voltage enters the dynamic state, and the dynamic control signal VINDYN signal becomes a high level. After entering the dynamic state, the gain Gm is increased to a preset multiple of the preset gain. In one embodiment, the dynamic control signal VINDYN signal becomes a high level, and after entering the dynamic state, the gain Gm is increased to 4 times the preset gain. The preset multiple can be set according to the specific circuit. Among them, the gain Gm is the gain of the operational amplifier circuit in the power supply system control loop, and the power supply system bandwidth can be adjusted accordingly by adjusting the gain Gm. In one embodiment, if Figure 6 As shown, when the dynamic control signal VINDYN changes from a first state (e.g., a high level) to a second state (e.g., a low level), the dynamic mode control circuit reduces the power system bandwidth every 2 ms until the power system bandwidth is reduced to a preset bandwidth, which is the bandwidth when the power system is in a steady state.

[0048] Another embodiment of the present invention further discloses a power supply system, which includes the dynamic control circuit as described in any of the above items. The power supply system is a constant voltage system, a constant current system, or a constant voltage and constant current system.

[0049] Another embodiment of the present invention further discloses a dynamic control method, which includes:

[0050] Step S100: receiving an input voltage sampling signal, and performing signal processing on the input voltage sampling signal to generate a first comparison signal;

[0051] Step S200: comparing a first comparison signal and a second comparison signal and generating a dynamic control signal; when the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state; and

[0052] Step S300: controlling the bandwidth of the power system according to the dynamic control signal, and increasing the bandwidth of the power system when the dynamic control signal is in a first state.

[0053] In one embodiment, the step of controlling the power system bandwidth according to the dynamic control signal further includes: when the dynamic control signal changes from the first state to the second state, gradually reducing the power system bandwidth to a preset bandwidth within a preset time, and the preset bandwidth is the bandwidth when the power system is in a steady state.

[0054] In another embodiment, the step of controlling the power system bandwidth according to the dynamic control signal further includes: when the dynamic control signal changes from the first state to the second state, reducing the power system bandwidth to a preset bandwidth at every preset time interval, where the preset bandwidth is the bandwidth when the power system is in a steady state.

[0055] In one embodiment, the step of performing signal processing based on the input voltage sampling signal to generate a first comparison signal includes: performing signal processing based on the input voltage sampling signal to generate a first comparison signal and a second comparison signal with different change speeds; or performing signal processing based on the input voltage sampling signal to generate the first comparison signal and provide a second comparison signal, wherein the second comparison signal is a preset value.

[0056] Those skilled in the art should know that the logic controls such as "high level" and "low level", "set" and "reset", "AND gate" and "OR gate", "non-inverting input terminal" and "inverting input terminal" in the logic controls involved in the specification or drawings can be interchanged or changed with each other, and the same function or purpose as the above embodiment can be achieved by adjusting the subsequent logic controls.

[0057] The description and application of the present invention here are illustrative and are not intended to limit the scope of the present invention to the above-mentioned embodiments. The relevant descriptions of the effects or advantages involved in the specification may not be reflected in the actual experimental examples due to the uncertainty of specific condition parameters or other factors, and the relevant descriptions of the effects or advantages are not used to limit the scope of the invention. Variations and changes to the embodiments disclosed here are possible, and the replacement of the embodiments and various equivalent components are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that, without departing from the spirit or essential characteristics of the present invention, the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts. Without departing from the scope and spirit of the present invention, other variations and changes can be made to the embodiments disclosed here.

Claims

1. A dynamic control circuit, characterized in that: The dynamic control circuit comprises: A comparison signal generating circuit, whose input terminal is used to receive an input voltage sampling signal, and is used to perform signal processing according to the input voltage sampling signal to generate a first comparison signal; a comparison circuit, whose input terminal is coupled to the output terminal of the comparison signal generating circuit, for comparing the first comparison signal and the second comparison signal and generating a dynamic control signal; when the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state; and The dynamic mode control circuit has an input terminal coupled to the output terminal of the comparison circuit and is used to control the power system bandwidth according to the dynamic control signal. When the dynamic control signal is in a first state, the power system bandwidth is increased.

2. The dynamic control circuit according to claim 1, characterized in that: When the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit gradually reduces the power system bandwidth to a preset bandwidth within a preset time, and the preset bandwidth is the bandwidth when the power system is in a steady state.

3. The dynamic control circuit according to claim 1, characterized in that: When the dynamic control signal changes from the first state to the second state, the dynamic mode control circuit reduces the bandwidth of the power system to a preset bandwidth at every preset time interval, where the preset bandwidth is the bandwidth when the power system is in a steady state.

4. The dynamic control circuit according to claim 1, characterized in that: The comparison signal generating circuit is used to perform signal processing according to the input voltage sampling signal to generate a first comparison signal and a second comparison signal with different change speeds; or, the comparison signal generating circuit is used to perform signal processing according to the input voltage sampling signal to generate a first comparison signal, and the second comparison signal is a preset value.

5. The dynamic control circuit according to claim 1, characterized in that: The comparison signal generating circuit includes a filtering circuit or a differentiating circuit.

6. The dynamic control circuit according to claim 5, characterized in that: The filtering circuit comprises: A first filtering circuit includes a first resistor and a first capacitor, wherein a first end of the first resistor is coupled to an input voltage sampling signal, a first end of the first capacitor is coupled to a second end of the first resistor, and a second end of the first capacitor is coupled to ground; and The second filter circuit includes a second resistor and a second capacitor. The first end of the second resistor is used to couple the input voltage sampling signal. The first end of the second capacitor is coupled to the second end of the second resistor. The second end of the second capacitor is coupled to the ground.

7. The dynamic control circuit according to claim 5, characterized in that: The differential circuit includes a third capacitor and a third resistor. The first end of the third capacitor is used to couple the input voltage sampling signal. The first end of the third resistor is coupled to the second end of the third capacitor. The second end of the third resistor is coupled to the ground.

8. The dynamic control circuit according to claim 6, characterized in that: The comparison circuit includes a first comparison circuit, a second comparison circuit and an OR gate; the first input terminal of the first comparison circuit is coupled to the negative electrode of the first power supply, the positive electrode of the first power supply is coupled to the first terminal of the second capacitor, and the second input terminal of the first comparison circuit is coupled to the first terminal of the first capacitor; The first input terminal of the second comparison circuit is coupled to the first terminal of the first capacitor, the second input terminal of the second comparison circuit is coupled to the positive terminal of the second power supply, and the negative terminal of the second power supply is coupled to the positive terminal of the second capacitor; the first input terminal of the OR gate is coupled to the output terminal of the first comparison circuit, the second input terminal of the OR gate is coupled to the output terminal of the second comparison circuit, and the output terminal of the OR gate outputs a dynamic control signal.

9. The dynamic control circuit according to claim 7, characterized in that: The comparison circuit includes a first comparison circuit, a second comparison circuit and an OR gate; a first input terminal of the first comparison circuit is coupled to the negative electrode of the third power supply, a positive electrode of the third power supply is coupled to the ground, and a second input terminal of the first comparison circuit is coupled to the second terminal of the third capacitor; The first input terminal of the second comparison circuit is coupled to the second terminal of the third capacitor, the second input terminal of the second comparison circuit is coupled to the positive terminal of the fourth power supply, and the negative terminal of the fourth power supply is coupled to the ground; the first input terminal of the OR gate is coupled to the output terminal of the first comparison circuit, the second input terminal of the OR gate is coupled to the output terminal of the second comparison circuit, and the output terminal of the OR gate outputs a dynamic control signal.

10. A power supply system, characterized in that: The power supply system includes the dynamic control circuit as described in any one of claims 1 to 9, and the power supply system is a constant voltage system, a constant current system or a constant voltage constant current system.

11. A dynamic control method, characterized in that: The dynamic control method comprises: receiving an input voltage sampling signal, and performing signal processing according to the input voltage sampling signal to generate a first comparison signal; comparing the first comparison signal and the second comparison signal and generating a dynamic control signal; when the absolute value of the difference between the first comparison signal and the second comparison signal is greater than a preset threshold, the dynamic control signal is in a first state; and The power system bandwidth is controlled according to the dynamic control signal, and when the dynamic control signal is in a first state, the power system bandwidth is increased.

12. The dynamic control method according to claim 11, characterized in that: The step of controlling the bandwidth of the power system according to the dynamic control signal also includes: when the dynamic control signal changes from the first state to the second state, gradually reducing the bandwidth of the power system to a preset bandwidth within a preset time, and the preset bandwidth is the bandwidth when the power system is in a steady state.

13. The dynamic control method according to claim 11, characterized in that: The step of controlling the bandwidth of the power system according to the dynamic control signal also includes: when the dynamic control signal changes from the first state to the second state, reducing the bandwidth of the power system to a preset bandwidth at every preset time interval, and the preset bandwidth is the bandwidth when the power system is in a steady state.

14. The dynamic control method according to claim 11, characterized in that: The step of performing signal processing according to the input voltage sampling signal to generate a first comparison signal comprises: Signal processing is performed on the input voltage sampling signal to generate a first comparison signal and a second comparison signal with different change speeds; or, signal processing is performed on the input voltage sampling signal to generate a first comparison signal, and a second comparison signal is provided, and the second comparison signal is a preset value.

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