Voltage and current control loop and power supply circuit

Abstract

The utility model relates to the technical field of circuit design, in particular to a voltage and current control loop, which is characterized in that the positive pole input end of a first operational amplifier is connected with the positive pole of a voltage stabilizing diode and the input end of a first loop bandwidth control circuit; the cathode input end is connected with the first end of the first phase increasing circuit and the first end of the first voltage adjusting circuit, and the output end is connected with the second end of the first phase increasing circuit; according to the current control loop, the positive electrode input end of a second operational amplifier is connected with the first end of a second voltage adjusting circuit and the first end of a second loop bandwidth control circuit, the negative electrode input end of the second operational amplifier is connected with the first end of a second phase increasing circuit and the second end of the second loop bandwidth control circuit, and the output end of the second operational amplifier is connected with the second end of the second phase increasing circuit. The second end of the second voltage adjusting circuit is connected with the positive electrode of the voltage stabilizing diode. According to the circuit, by limiting the bandwidth of the operational amplifier, the loop gain and the phase margin are improved, so that the stability of the output voltage is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of circuit design, specifically relates to a voltage current control loop and power supply circuit in the technical field of circuit design. BACKGROUND

[0002] In the related art, the loop design of the voltage current control loop, due to the instability of the loop, can cause too large output response and poor dynamic load. Moreover, in the related art, by adjusting the RC parameters of each loop, the stability of the loop cannot be improved. INVENTION CONTENTS

[0003] The utility model discloses a voltage current control loop and power supply circuit, adopt the technical scheme as follows specifically:

[0004] The utility model embodiment provides a voltage current control loop, the voltage current control loop, include: voltage control loop and current control loop, wherein:

[0005] The voltage control loop and the current control loop are connected through the stabilized voltage diode to the external power supply circuit, wherein the negative electrode of the stabilized voltage diode is connected to the output voltage, and the positive electrode is connected to the voltage control loop and the current control loop respectively.

[0006] The voltage control loop includes: the positive input end of the first operational amplifier is connected to the positive electrode of the stabilized voltage diode and the input end of the first loop bandwidth control circuit respectively, the negative input end is connected to the first end of the first phase increasing circuit and the first end of the first voltage adjusting circuit respectively, and the output end is connected to the second end of the first phase increasing circuit. The second end of the first voltage adjusting circuit is grounded, and the third end is used to provide an output voltage. Wherein, the first phase increasing circuit is used to increase the phase of the first operational amplifier, and the first loop bandwidth control circuit is used to control the bandwidth of the first operational amplifier.

[0007] The current control loop includes: the positive input end of the second operational amplifier is connected to the first end of the second voltage adjusting circuit and the first end of the second loop bandwidth control circuit respectively, the negative input end is connected to the first end of the second phase increasing circuit and the second end of the second loop bandwidth control circuit respectively, and the output end is connected to the second end of the second phase increasing circuit. The second end of the second voltage adjusting circuit is connected to the positive electrode of the stabilized voltage diode, and the third end of the second voltage adjusting circuit is grounded. Wherein, the second phase increasing circuit is used to increase the phase of the second operational amplifier, and the second loop bandwidth control circuit is used to control the bandwidth of the second operational amplifier.

[0008] In some embodiments, the first voltage adjusting circuit includes: a first resistor, a second resistor and a third resistor, wherein,

[0009] The first terminal of the first resistor is connected to the first terminal of the second resistor; the second terminal of the first resistor is used to provide the output voltage; the second terminal of the second resistor is connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded.

[0010] When the voltage at the negative input terminal of the first operational amplifier is higher than the voltage at the positive input terminal, the output terminal of the first operational amplifier outputs a low level, the Zener diode enters the conducting state and collects the output voltage and feeds it back to the positive input terminal of the first operational amplifier, forming a loop.

[0011] In some embodiments, the first phase-enhancing circuit includes: a first capacitor and a fourth resistor; wherein,

[0012] The first end of the fourth resistor is connected to the output terminal of the first operational amplifier, the second end of the fourth resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the negative input terminal of the first operational amplifier.

[0013] In some embodiments, the first loop bandwidth control circuit includes: a second capacitor and a fifth resistor; wherein:

[0014] The second capacitor is connected in parallel with the fifth resistor and is connected to the positive input terminal of the first operational amplifier.

[0015] In some embodiments, the second phase-boosting circuit includes a sixth resistor and a third capacitor; wherein: one end of the sixth resistor is connected to one end of the third capacitor, and the other end is connected to the output terminal of the second operational amplifier; the other end of the third capacitor is connected to the negative input terminal of the second operational amplifier.

[0016] In some embodiments, the second voltage adjustment circuit includes: a seventh resistor and an eighth resistor; wherein:

[0017] One end of the seventh resistor is connected to the positive terminal of the Zener diode, and the other end is connected to one end of the eighth resistor and the positive input terminal of the second operational amplifier; the other end of the eighth resistor is grounded.

[0018] In some embodiments, the second loop bandwidth control circuit includes: a ninth resistor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein:

[0019] One end of the sixth capacitor is connected to the positive input terminal of the second operational amplifier, and the other end is connected to one end of the fourth capacitor; the other end of the fourth capacitor is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the fifth capacitor; the other end of the fifth capacitor is connected to the other end of the eighth resistor and grounded.

[0020] In some embodiments, the voltage control loop further includes a first rectifier diode; the current control loop further includes a second rectifier diode.

[0021] The output terminal of the first operational amplifier in the voltage control loop is connected to the negative terminal of the first rectifier diode, and the positive terminal of the first rectifier diode is connected to the first terminal of the tenth resistor and the positive terminal of the second rectifier diode, respectively; the second terminal of the tenth resistor is connected to the output voltage; and the negative terminal of the second rectifier diode is connected to the output terminal of the second operational amplifier in the current control loop.

[0022] This utility model embodiment provides a power supply circuit, including: an input protection circuit, a rectifier and filter circuit, a voltage absorption circuit, a voltage control loop, and a current control loop; wherein:

[0023] One end of the input protection circuit is connected to the input signal, and the other end is connected to the first end of the rectifier and filter circuit. The second end of the rectifier and filter circuit is connected to the first end of the voltage absorption circuit. The second end of the voltage absorption circuit is connected to the input end of the voltage control loop and the input end of the current control loop, respectively.

[0024] The input protection circuit is used to suppress surge current in the input signal;

[0025] The rectifier and filter circuit is used to reduce the noise of the input signal to obtain a noise-reduced signal;

[0026] The voltage absorption circuit is used to absorb the voltage spikes in the noise-reduced signal to obtain the processed signal;

[0027] The voltage control loop is used to adjust the current first bandwidth information through feedback to control the output voltage corresponding to the processed signal.

[0028] The current control loop is used to control the output current corresponding to the processed signal by adjusting the current second bandwidth information through feedback.

[0029] This invention has the following advantages: In the voltage and current control loop, the voltage control loop and the current control loop are connected to the output voltage of the external power supply circuit through a Zener diode; wherein, the negative terminal of the Zener diode is connected to the output voltage, and the positive terminal is connected to both the voltage control loop and the current control loop; thus, the voltage control loop and the current control loop can output the adjusted output voltage and output current to the external power supply circuit through the Zener diode. In the voltage control loop, the positive input terminal of the first operational amplifier is connected to the positive terminal of the Zener diode and the input terminal of the first loop bandwidth control circuit, the negative input terminal is connected to the first terminal of the first phase amplification circuit and the first terminal of the first voltage adjustment circuit, and the output terminal is connected to the second terminal of the first phase amplification circuit; the second terminal of the first voltage adjustment circuit is grounded, and the third terminal is used to provide the output voltage. In this way, by increasing the phase of the first operational amplifier through the first phase amplification circuit and limiting the bandwidth of the first operational amplifier through the first loop bandwidth control circuit, the loop gain and phase margin can be improved, thereby improving the stability of the output voltage. Similarly, by increasing the phase of the second operational amplifier through the second phase amplification circuit and limiting the bandwidth of the second operational amplifier through the second loop bandwidth control circuit, the stability of the output current can be improved, thereby improving the stability of the external power supply circuit. Attached Figure Description

[0030] To more clearly illustrate the technical solutions and advantages in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the composition structure of a voltage and current control loop provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of another component structure of a voltage and current control loop provided in an embodiment of this utility model;

[0033] Figure 3 This is a schematic diagram of the composition structure of a power supply circuit provided in an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of another component structure of a power supply circuit provided in an embodiment of this utility model. Detailed Implementation

[0035] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a voltage and current control loop proposed according to this utility model. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments may be combined from any suitable form.

[0036] In the description of the embodiments of this utility model, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this utility model, "multiple" means two or more.

[0037] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] The specific scheme of a voltage and current control loop provided by this utility model is described below with reference to the accompanying drawings. Please refer to the attached drawings. Figure 1 This illustration shows a schematic diagram of the composition structure of a voltage and current control loop 100 according to an embodiment of the present invention. The voltage and current control loop 100 includes a voltage control loop 101 and a current control loop 102. The voltage control loop and the current control loop are connected to an external power supply circuit through a Zener diode (ZD1) 103. The negative terminal of the Zener diode is connected to the output voltage, and the positive terminal is connected to the voltage control loop and the current control loop, respectively.

[0040] Here, the voltage control loop 101 and the current control loop 102 are connected to the external power supply circuit through the Zener diode 103, so that the output voltage and output current of the power supply circuit can be adjusted through loop feedback.

[0041] The voltage control loop 101 includes: a first operational amplifier 111, a first loop bandwidth control circuit 112, a first phase increase circuit 113, and a first voltage adjustment circuit 114; wherein:

[0042] The positive input terminal of the first operational amplifier 111 is connected to the positive terminal of the Zener diode 103 and the input terminal of the first loop bandwidth control circuit, respectively. The negative input terminal is connected to the first terminal of the first phase amplification circuit and the first terminal of the first voltage adjustment circuit, respectively. The output terminal is connected to the second terminal of the first phase amplification circuit. The second terminal of the first voltage adjustment circuit is grounded, and the third terminal is used to provide the output voltage.

[0043] Here, the Zener diode collects the output voltage of the external power supply circuit and feeds it back to the first operational amplifier.

[0044] like Figure 2 As shown, in the voltage control loop, the output voltage is acquired by the Zener diode ZD1 and fed back to the positive input terminal of the first operational amplifier. This allows the first operational amplifier to control the high and low levels of the output terminal by comparing the voltage at the positive input terminal with the voltage at the negative input terminal. The high and low levels of the output terminal control the on and off states of the Zener diode, thus forming a loop.

[0045] The first phase amplification circuit 113 amplifies the phase of the output signal of the first operational amplifier and feeds it back to the negative input terminal of the first operational amplifier.

[0046] Here, the first phase amplification circuit amplifies the phase of the output signal of the first operational amplifier through resistors and capacitors, and feeds the amplified signal back to the negative input terminal of the first operational amplifier.

[0047] In some possible implementations, the first phase-boosting circuit includes: a first capacitor and a fourth resistor; wherein a first terminal of the fourth resistor is connected to the output terminal of the first operational amplifier, a second terminal of the fourth resistor is connected to the first terminal of the first capacitor, and a second terminal of the first capacitor is connected to the negative input terminal of the first operational amplifier. Figure 2 As shown, the first phase amplification circuit includes a capacitor C14 and a resistor R17. In this way, the phase of the first operational amplifier is increased by the capacitor C14 and the resistor R17. While ensuring stability, the low-frequency gain is increased as much as possible, the high-frequency poles are increased, the switching noise interference is reduced, the peak time is reduced, the system response is accelerated, and the gain effect is improved.

[0048] The first loop bandwidth control circuit 112 controls the first bandwidth information of the first operational amplifier by adjusting the current first capacitor and resistor parameters.

[0049] Here, the first bandwidth information may include: the phase margin and gain margin of the first operational amplifier, etc. The first capacitor and resistor parameters include: the charge of the capacitor and the resistance value, etc. In some possible implementations, the first loop bandwidth control circuit includes: a second capacitor and a fifth resistor; wherein: the second capacitor and the fifth resistor are connected in parallel and connected to the positive input terminal of the first operational amplifier. For example...Figure 2 As shown, the first loop bandwidth control circuit includes: capacitor C15 (i.e., the second capacitor) and resistor R16 (i.e., the fifth resistor). In this embodiment of the invention, although a higher loop bandwidth is better, the bandwidth of the compensation amplifier is not infinite due to changes in input voltage, load, and inductance. When the loop bandwidth is set very high, it will be limited by the compensation amplifier's inability to provide gain. At this time, the stability of the entire loop is balanced by adjusting the values ​​of capacitor C15 and resistor R16 to ensure the stability of the entire loop.

[0050] The first voltage adjustment circuit 114 adjusts the output voltage of the external power supply circuit based on the voltage at the negative input terminal of the first operational amplifier.

[0051] Here, the voltage at the negative input terminal of the first operational amplifier is adjusted by the first voltage adjustment circuit 114 to control the output voltage at the output terminal of the first operational amplifier. In some possible implementations, the first voltage adjustment circuit includes: a first resistor, a second resistor, and a third resistor; wherein,

[0052] The first end of the first resistor is connected to the first end of the second resistor; the second end of the first resistor is used to provide the output voltage; the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is grounded.

[0053] The first voltage adjustment circuit also adjusts the output voltage based on the first resistor, the second resistor, and the third resistor; when the voltage at the negative input terminal of the first operational amplifier is higher than the voltage at the positive input terminal, the output terminal of the first operational amplifier outputs a low level, the Zener diode enters the conducting state and collects the output voltage and feeds it back to the positive input terminal of the first operational amplifier, forming a loop.

[0054] like Figure 2 As shown, the first voltage adjustment circuit includes: resistors R22a (i.e., the first resistor), R22b (i.e., the second resistor), and R23 (i.e., the third resistor). Thus, the output voltage is controlled by resistors R22a, R22b, and R23 (for example, in this embodiment of the invention, the power supply parameters are 54 volts (V) and 11 amps (A)). When the voltage at point A of the first operational amplifier is higher than the voltage at point B, the output terminal C outputs a low level. The output voltage is collected through the diode ZD1 terminal and fed back to the positive input terminal of the first operational amplifier to form a voltage control loop. This allows for precise control of the output voltage while ensuring the stability of the voltage and current control loop.

[0055] The current control loop 102 includes: a second operational amplifier 121, a second loop bandwidth control circuit 122, a second phase increase circuit 123, and a second voltage adjustment circuit 124; wherein:

[0056] The positive input terminal of the second operational amplifier 121 is connected to the first terminal of the second voltage adjustment circuit 124 and the first terminal of the second loop bandwidth control circuit 122, respectively. The negative input terminal is connected to the first terminal of the second phase amplification circuit and the second terminal of the second loop bandwidth control circuit 122, respectively. The output terminal is connected to the second terminal of the second phase amplification circuit 123. The second terminal of the second voltage adjustment circuit 124 is connected to the positive terminal of the Zener diode, and the third terminal of the second voltage adjustment circuit is grounded.

[0057] like Figure 2 As shown, in the current control loop, the output voltage is acquired through the Zener diode ZD1 and fed back to the positive input terminal of the second operational amplifier. This allows the second operational amplifier to control the high and low levels of the output terminal by comparing the voltage at the positive input terminal with the voltage at the negative input terminal. The high and low levels of the output terminal control the on and off states of the Zener diode, thus forming a loop.

[0058] In the current control loop, the second phase amplification circuit is used to amplify the phase of the output signal of the second operational amplifier and feed it back to the negative input terminal of the second operational amplifier.

[0059] In some possible implementations, the second phase amplification circuit includes: a sixth resistor and a third capacitor; wherein: one end of the sixth resistor is connected to one end of the third capacitor, and the other end is connected to the output terminal of the second operational amplifier; the other end of the third capacitor is connected to the negative input terminal of the second operational amplifier.

[0060] like Figure 2 As shown, the second phase boosting circuit includes a resistor R18 (the sixth resistor) and a capacitor C12 (the third capacitor). Thus, the phase boosting circuit, composed of resistor R18 and capacitor C12, can boost the phase of the second operational amplifier. While ensuring stability, it maximizes the low-frequency gain, increases the number of high-frequency poles, reduces switching noise interference, shortens peak time, accelerates system response, and improves the overall gain.

[0061] The second voltage adjustment circuit is used to adjust the output current based on the current at the positive input terminal of the second operational amplifier. In some possible implementations, the second voltage adjustment circuit includes a seventh resistor and an eighth resistor; wherein: one end of the seventh resistor is connected to the positive terminal of the Zener diode, and the other end is connected to one end of the eighth resistor and the positive input terminal of the second operational amplifier respectively; the other end of the eighth resistor is grounded.

[0062] like Figure 2As shown, the second voltage adjustment circuit includes resistors R19 (the seventh resistor) and R20 (the eighth resistor). By connecting resistors R19 and R20 to the positive input terminal of the second operational amplifier, the output current of the second operational amplifier can be controlled. In the second operational amplifier, when the voltage at point A is higher than that at point B, the output level at point C is low. The output current is sampled through the ZD1 terminal to form a current control loop.

[0063] The second loop bandwidth control circuit is used to control the second bandwidth information of the second operational amplifier by adjusting the current first capacitor and resistor parameters;

[0064] Here, the parameters of the second capacitor and resistor include: the charge of the capacitor and the resistance value, etc. The second bandwidth information may include: the phase margin and gain margin of the second operational amplifier, etc. In some possible implementations, the second loop bandwidth control circuit includes: a ninth resistor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein: one end of the sixth capacitor is connected to the positive input terminal of the second operational amplifier, and the other end is connected to one end of the fourth capacitor; the other end of the fourth capacitor is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the fifth capacitor; the other end of the fifth capacitor is connected to the other end of the eighth resistor and grounded.

[0065] like Figure 2 As shown, the second loop bandwidth control circuit includes: capacitor C9 (i.e., the fourth resistor), C10 (i.e., the fifth resistor), C11 (i.e., the sixth resistor), and resistor R24 ​​(i.e., the ninth resistor). In this embodiment of the invention, although a higher loop bandwidth is better, the bandwidth of the compensation amplifier is not infinite due to changes in input voltage, load, and inductance. When the loop bandwidth is set very high, it will be limited by the compensation amplifier's inability to provide gain. At this time, the stability of the entire loop is balanced by adjusting the values ​​of capacitors C9, C10, C11, and resistor R24 ​​to ensure the stability of the entire loop.

[0066] In some possible implementations, the voltage control loop also includes: a first rectifier diode, i.e., as shown below. Figure 2 The diode D7 shown; the current control loop further includes: a second rectifier diode, i.e., as shown in the figure. Figure 2The diode D8 is shown. In the voltage control loop, the output terminal of the first operational amplifier is connected to the negative terminal of the first rectifier diode. The positive terminal of the first rectifier diode is connected to the first terminal of the ninth resistor and the positive terminal of the second rectifier diode. The second terminal of the ninth resistor is connected to the output voltage. The negative terminal of the second rectifier diode is connected to the output terminal of the second operational amplifier in the current control loop. Introducing diode D7 in the voltage control loop makes the output voltage of the first operational amplifier more stable; introducing diode D8 in the current control loop makes the output current of the second operational amplifier more stable.

[0067] In this embodiment of the invention, in the voltage and current control loop, the voltage control loop and the current control loop are connected to the output voltage of the external power supply circuit through a Zener diode; wherein, the negative terminal of the Zener diode is connected to the output voltage, and the positive terminal is connected to both the voltage control loop and the current control loop; thus, the voltage control loop and the current control loop can output the adjusted output voltage and output current to the external power supply circuit through the Zener diode. In the voltage control loop, the positive input terminal of the first operational amplifier is connected to the positive terminal of the Zener diode and the input terminal of the first loop bandwidth control circuit, respectively; the negative input terminal is connected to the first terminal of the first phase amplification circuit and the first terminal of the first voltage adjustment circuit, respectively; and the output terminal is connected to the second terminal of the first phase amplification circuit; the second terminal of the first voltage adjustment circuit is grounded, and the third terminal is used to provide the output voltage. In this way, by increasing the phase of the first operational amplifier through the first phase amplification circuit and limiting the bandwidth of the first operational amplifier through the first loop bandwidth control circuit, the loop gain and phase margin can be improved, thereby improving the stability of the output voltage. Similarly, by increasing the phase of the second operational amplifier through the second phase amplification circuit and limiting the bandwidth of the second operational amplifier through the second loop bandwidth control circuit, the stability of the output current can be improved, thereby improving the stability of the external power supply circuit.

[0068] This utility model embodiment provides a power supply circuit, such as Figure 3 As shown, the power supply circuit 300 includes: an input protection circuit 301, a rectifier and filter circuit 302, a voltage absorption circuit 303, a voltage control loop 101, and a current control loop 102; wherein:

[0069] One end of the input protection circuit is connected to the input signal, and the other end is connected to the first end of the rectifier and filter circuit. The second end of the rectifier and filter circuit is connected to the first end of the voltage absorption circuit. The second end of the voltage absorption circuit is connected to the input end of the voltage control loop and the input end of the current control loop, respectively.

[0070] The input protection circuit 301 suppresses the surge current in the input signal.

[0071] Here, one end of the input protection circuit is connected to the input signal, which controls the opening and closing of the fuse to protect the power supply; a varistor is used to suppress lightning surges in the input signal, and a thermistor is used to suppress inrush currents in the input signal. For example... Figure 4 As shown, the input protection circuit includes: Figure 4 The circuit consists of a fuse Fu1, a varistor VDR, and a thermistor RT1. The fuse Fu1 protects the power supply and trips in case of an abnormality. The varistor VDR suppresses lightning surges. The thermistor RT1 suppresses inrush current.

[0072] The rectifier and filter circuit 302 performs noise reduction on the input signal to obtain a noise-reduced signal.

[0073] Here, the rectifier and filter circuit is used to rectify and filter the input signal to reduce the noise of the input signal, thereby obtaining a noise-reduced signal.

[0074] like Figure 4 As shown, the rectifier-filter circuit includes: capacitor CX1, inductor LF1, resistors R1a, R1b, R2a, R2b, current bridge DB1, and electrolytic capacitor CD1; wherein, resistors R1a, R1b, R2a, and R2b are used to discharge capacitor CX1. CX1 / LF1 is used to suppress electromagnetic interference (EMI). Rectifier bridge DB1 is used to rectify and filter the input signal, and CD1 is used to filter the rectified DC current.

[0075] The voltage absorption circuit 303 is used to absorb the peak voltage in the noise-reduced signal to obtain the processed signal.

[0076] Here, the voltage absorption circuit includes: a spike absorption circuit, a chip control circuit, a rectifier absorption circuit, and an output filter circuit; wherein: the first terminal of the spike absorption circuit is connected to the first terminal of the chip control circuit, the second terminal is connected to the output terminal of the rectifier filter circuit, and the third terminal is connected to the first terminal of transformer TR1; the second terminal of the chip control circuit is grounded, and the third terminal is connected to the second terminal of transformer TR1; the third terminal of transformer TR1 is connected to the first terminal of the rectifier absorption circuit, the second terminal of the rectifier absorption circuit is connected to the input terminal of the output filter circuit, and the output terminal of the output filter circuit provides the output voltage.

[0077] The spike absorption circuit is used to absorb the spike voltage of the noise-reduced signal in the MOS transistor to obtain the absorbed signal.

[0078] like Figure 4As shown, the spike absorption circuit includes: resistors R4a, R4b, R4c, R4d, R5, capacitor C1, and diode D1; in this circuit, resistors R4a, R4b, R4c, R4d, R5, capacitor C1, and diode D1 are used to absorb the spike voltage of the MOSFET (i.e., the switching transistor) to obtain the absorbed signal.

[0079] The chip control circuit is used to perform functional matching of the pin parameters of the power management chip based on the absorbed signal.

[0080] like Figure 4 As shown, the chip control circuit includes: resistors R3a, R3b, R12, R8, R9, R6, R10, R7a-R7f, RJ1, R11a, R11b, RUa, and R21; a thermistor RT2; capacitors C2, C3, C4, C5, C7, and C8; a phototransistor PH1B; electrolytic capacitors CD2a and CD2b; diodes D2, D3, and D4; and a power management chip IC1. In this chip control circuit, resistors R3a and Rb are used to supply power to the power management chip IC1. This chip control circuit controls the pulse bandwidth of the power management chip IC1 and matches corresponding parameters according to the functions of each pin of the power management chip IC1.

[0081] The rectifier absorption circuit is used to rectify the output signal of the chip control circuit and absorb the peak voltage of the rectified output signal.

[0082] Here, the rectifier snubber circuit is used to absorb the voltage spikes after rectification. For example... Figure 4 As shown, the rectifier snubber circuit includes diodes D6 and D5, capacitor C6, and resistor R13. In this rectifier snubber circuit, D5 and D6 are used for output rectification. C6 and R13 are used to absorb the rectified peak voltage.

[0083] An output filter circuit is used to filter the output voltage of the voltage control loop and the output current of the current control loop.

[0084] like Figure 4 As shown, the output filter circuit includes: electrolytic capacitors CD3 and CD4, resistors R25 and R26, a green LED photodiode, and a common-mode inductor LF2. In this way, electrolytic capacitors CD3 and CD4 filter the output, ensuring that the common-mode inductor LF2 outputs a more accurate output voltage.

[0085] In this embodiment of the invention, in the power supply circuit, one end of the input protection circuit is connected to the input signal, and the other end is connected to the first end of the rectifier-filter circuit. The second end of the rectifier-filter circuit is connected to the first end of the voltage absorption circuit, and the second end of the voltage absorption circuit is connected to the input end of the voltage control loop and the input end of the current control loop, respectively. Thus, the input protection circuit can protect the power supply by suppressing the surge current in the input signal. The rectifier-filter circuit is used to reduce the noise in the input signal to obtain a denoised signal; the voltage absorption circuit is used to absorb the voltage spikes in the denoised signal to obtain a processed signal; the voltage control loop is used to control the output voltage corresponding to the processed signal by adjusting the current first bandwidth information through feedback; simultaneously, the current control loop controls the output current corresponding to the processed signal by adjusting the current second bandwidth information through feedback. In this way, the output voltage is controlled more accurately by adjusting the first bandwidth information in the voltage control loop feedback regulation circuit; and the output current is controlled more accurately by adjusting the second bandwidth information in the current control loop feedback regulation circuit. At the same time, the phase margin and gain margin in the loop are improved, thereby improving the stability of the loop and reducing the impact of loop instability on the power supply.

[0086] Optionally, the transmission medium can be a wired link (e.g., but not limited to, coaxial cable, optical fiber, and Digital Subscriber Line (DSL)) or a wireless link (e.g., but not limited to, Wireless Fidelity (WIFI), Bluetooth, and mobile device networks). It should be noted that the system provided in the above embodiments is only an example illustrating the division of the functional modules described above. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or part of the functions described above.

[0087] Furthermore, this embodiment can be implemented through multiple functional modules. For example, each functional module can correspond to a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation. It should also be noted that all relevant content of each step involved in the above voltage and current control loop embodiment can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0088] It should be understood that, when using integrated units, the system may include a processing module and a storage module. When the system is applied to a device, the processing module can be used to control and manage the device's operations. The storage module can be used to support the device in executing program code, etc. The processing module can be a processor or a controller, which can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the present invention disclosure. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of Digital Signal Processing (DSP) and a microprocessor, etc., and the storage module can be a memory.

[0089] Furthermore, the system provided in the embodiments of this utility model may specifically be a chip, component, or module. The chip may include a connected processor and a memory. The memory stores instructions, and when the processor calls and executes the instructions, the chip can execute a voltage and current control loop provided in the above embodiments. This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer performs the aforementioned steps to implement a voltage and current control loop provided in the above embodiments.

[0090] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to execute the aforementioned related steps to realize a voltage and current control loop provided in the above embodiment. The system, computer-readable storage medium, computer program product, or chip provided in this embodiment are all used to execute the corresponding voltage and current control loop provided above. Therefore, the beneficial effects they achieve can be referred to the beneficial effects in the corresponding voltage and current control loop provided above, and will not be repeated here. Through the description of the above embodiments, those skilled in the art can understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the system can be divided into different functional modules to complete all or part of the functions described above. In the embodiments provided by this utility model, it should be understood that the disclosed system and voltage and current control loop can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, system or unit, and can be electrical, mechanical or other forms.

[0091] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multiple task processing and parallel processing are possible or may be advantageous. The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The above content is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A voltage and current control loop, characterized in that, The voltage and current control loop includes: a voltage control loop and a current control loop; wherein: The voltage control loop and the current control loop are connected to an external power supply circuit through a Zener diode; wherein, the negative terminal of the Zener diode is connected to the output voltage, and the positive terminal is connected to the voltage control loop and the current control loop respectively; The voltage control loop includes: the positive input terminal of the first operational amplifier is connected to the positive terminal of the Zener diode and the input terminal of the first loop bandwidth control circuit, the negative input terminal is connected to the first terminal of the first phase amplification circuit and the first terminal of the first voltage adjustment circuit, and the output terminal is connected to the second terminal of the first phase amplification circuit; the second terminal of the first voltage adjustment circuit is grounded, and the third terminal is used to provide the output voltage; wherein, the first phase amplification circuit is used to increase the phase of the first operational amplifier, and the first loop bandwidth control circuit is used to control the bandwidth of the first operational amplifier; The current control loop includes: the positive input terminal of the second operational amplifier is connected to the first terminal of the second voltage adjustment circuit and the first terminal of the second loop bandwidth control circuit, the negative input terminal is connected to the first terminal of the second phase amplification circuit and the second terminal of the second loop bandwidth control circuit, and the output terminal is connected to the second terminal of the second phase amplification circuit; the second terminal of the second voltage adjustment circuit is connected to the positive terminal of the Zener diode, and the third terminal of the second voltage adjustment circuit is grounded; wherein, the second phase amplification circuit is used to increase the phase of the second operational amplifier, and the second loop bandwidth control circuit is used to control the bandwidth of the second operational amplifier.

2. The voltage and current control loop according to claim 1, characterized in that, The first voltage adjustment circuit includes: a first resistor, a second resistor, and a third resistor; wherein, The first terminal of the first resistor is connected to the first terminal of the second resistor; the second terminal of the first resistor is used to provide the output voltage; the second terminal of the second resistor is connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded. When the voltage at the negative input terminal of the first operational amplifier is higher than the voltage at the positive input terminal, the output terminal of the first operational amplifier outputs a low level, the Zener diode enters the conducting state and collects the output voltage and feeds it back to the positive input terminal of the first operational amplifier, forming a loop.

3. The voltage and current control loop according to claim 1, characterized in that, The first phase amplification circuit includes: a first capacitor and a fourth resistor; wherein, The first end of the fourth resistor is connected to the output terminal of the first operational amplifier, the second end of the fourth resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the negative input terminal of the first operational amplifier.

4. The voltage and current control loop according to claim 1, characterized in that, The first loop bandwidth control circuit includes: a second capacitor and a fifth resistor; wherein: The second capacitor is connected in parallel with the fifth resistor and is connected to the positive input terminal of the first operational amplifier.

5. A voltage and current control loop according to claim 1, characterized in that, The second phase amplification circuit includes a sixth resistor and a third capacitor; wherein: one end of the sixth resistor is connected to one end of the third capacitor, and the other end is connected to the output terminal of the second operational amplifier; the other end of the third capacitor is connected to the negative input terminal of the second operational amplifier.

6. A voltage and current control loop according to claim 1, characterized in that, The second voltage adjustment circuit includes: a seventh resistor and an eighth resistor; wherein: One end of the seventh resistor is connected to the positive terminal of the Zener diode, and the other end is connected to one end of the eighth resistor and the positive input terminal of the second operational amplifier; the other end of the eighth resistor is grounded.

7. A voltage and current control loop according to claim 6, characterized in that, The second loop bandwidth control circuit includes: a ninth resistor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; wherein: One end of the sixth capacitor is connected to the positive input terminal of the second operational amplifier, and the other end is connected to one end of the fourth capacitor; the other end of the fourth capacitor is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the fifth capacitor; the other end of the fifth capacitor is connected to the other end of the eighth resistor and grounded.

8. A voltage and current control loop according to claim 1, characterized in that, The voltage control loop further includes a first rectifier diode; the current control loop further includes a second rectifier diode. The output terminal of the first operational amplifier in the voltage control loop is connected to the negative terminal of the first rectifier diode, and the positive terminal of the first rectifier diode is connected to the first terminal of the tenth resistor and the positive terminal of the second rectifier diode, respectively; the second terminal of the tenth resistor is connected to the output voltage; and the negative terminal of the second rectifier diode is connected to the output terminal of the second operational amplifier in the current control loop.

9. A power supply circuit, characterized in that, The power supply circuit includes: an input protection circuit, a rectifier and filter circuit, a voltage absorption circuit, a voltage control loop, and a current control loop; wherein: One end of the input protection circuit is connected to the input signal, and the other end is connected to the first end of the rectifier and filter circuit. The second end of the rectifier and filter circuit is connected to the first end of the voltage absorption circuit. The second end of the voltage absorption circuit is connected to the input end of the voltage control loop and the input end of the current control loop, respectively. The input protection circuit is used to suppress surge current in the input signal; The rectifier and filter circuit is used to reduce the noise of the input signal to obtain a noise-reduced signal; The voltage absorption circuit is used to absorb the voltage spikes in the noise-reduced signal to obtain the processed signal; The voltage control loop is used to adjust the current first bandwidth information through feedback to control the output voltage corresponding to the processed signal. The current control loop is used to control the output current corresponding to the processed signal by adjusting the current second bandwidth information through feedback.

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