Control circuit adapted to control of multiple current limiting points at same output
By using voltage and current loops in coordinated control, the problem of a single current limiting point in traditional power supply equipment is solved, enabling precise regulation of output voltage and current, improving circuit stability and adaptability, and reducing hardware costs and equipment size.
Patent Information
- Application Number
- CN202422916712.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Traditional power supply equipment uses a single current limiting point control, which is difficult to meet diverse needs, increases hardware complexity and cost, and the lack of coordinated control between voltage loop and current loop leads to fluctuations in output voltage or current.
The system employs coordinated control of voltage and current loops. The controller connects the voltage and current loops and connects their outputs to the PWM control chip, enabling dual control of the output voltage and current. Operational amplifiers are used to enhance stability and accuracy, while transistors are used for current limiting control.
It improves the stability and response speed of the circuit, enables flexible adaptation and precise adjustment of multiple current limiting points, prevents circuit overload, and reduces hardware costs and equipment size.
Smart Images
Figure CN223514781U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of power electronics, especially relates to a control circuit suitable for multiple current limit point control of the same output. BACKGROUND
[0002] In the field of power electronics, the stability and safety of power supply equipment have always been the focus of research and design. Traditional power supply equipment usually adopts single current limit point control, that is, only one fixed current limit value can be set during the output process of the equipment. However, with the increasing requirements of modern electronic equipment on power supply, single current limit point control has been difficult to meet the diversified needs in actual application.
[0003] In order to solve this problem, the industry has begun to explore power supply equipment with multiple current limit point control. Such equipment can automatically adjust the output current according to the load condition to ensure stable operation of the equipment under different load conditions. However, the existing multiple current limit point control scheme often needs to increase additional hardware circuit to realize, which not only increases the complexity and cost of the equipment, but also may lead to the increase of the size of the equipment.
[0004] In addition, in the traditional power supply control circuit, the voltage loop and the current loop usually work independently, lacking the ability of cooperative control. Although this design method simplifies the circuit structure to some extent, it is difficult to realize accurate adjustment of the output voltage and current. Especially in the case of large load change, the control effect of single loop is often not ideal, which is easy to cause the fluctuation of output voltage or current. SUMMARY
[0005] The utility model discloses a kind of control circuits suitable for multiple current limit point control of the same output, which can realize multiple current limit point control, and also can realize accurate adjustment of output voltage and current by the cooperative control effect of voltage loop and current loop in the case of controlling equipment size and hardware cost.
[0006] Based on the specification, the utility model provides a kind of control circuit suitable for multiple current limit point control of the same output, comprising: voltage loop and current loop;
[0007] The input end of the voltage loop is configured with a voltage reference port and a voltage feedback port, the voltage reference port is connected with a controller, and the voltage feedback port is used to input an actual voltage feedback value;
[0008] The input end of the current loop is configured with a current reference port and a current feedback port, the current reference port is connected with a controller, and the current feedback port is used to input an actual current feedback value;
[0009] The output end of the voltage loop and the output end of the current loop are connected with a PWM control chip, and a triode is arranged between the current loop output end and the PWM control chip, and the triode is turned on when the actual current feedback value is greater than the reference current.
[0010] Through the above technical solution, the controller is connected with the voltage loop and the current loop at the same time, and the outputs of the two are connected to the PWM control chip, realizing the double control of output voltage and current, which helps to improve the stability and response speed of the circuit. The voltage loop ensures the stability of the output voltage, and the current loop can accurately control at multiple current limiting points, so that the circuit can adapt to the demand of multiple current limiting points for the same output, improving the flexibility and adaptability of the circuit. The voltage loop and the current loop can work independently or cooperatively according to actual needs to realize accurate adjustment of output voltage and current. Through the setting of the current loop, when the output current exceeds the preset value, the current can be quickly limited to prevent the circuit from being overloaded or damaged. It well solves the problem that a power supply device has only one current limiting point, and in order to reach the maximum current limiting point, the power and size must be increased. The hardware cost and the size of the device are effectively controlled.
[0011] As a further technical solution, the voltage loop includes a first operational amplifier, the positive input end of the first operational amplifier is connected with a voltage reference port, the negative input end of the first operational amplifier is connected with a voltage feedback port, the output end of the first operational amplifier is connected with the PWM control chip, the first capacitor and the first resistor are connected in series between the output end of the first operational amplifier and the negative input end of the first operational amplifier, and the output end of the first operational amplifier is also connected with the base of the triode.
[0012] The above technical solution introduces the first operational amplifier as the core element of the voltage loop, which enhances the stability and precision of voltage control. At the same time, the output end of the first operational amplifier is connected with the base of the triode, so that when the current exceeds the current limiting point, the triode can quickly turn on, thereby realizing effective control of the current.
[0013] As a further technical solution, the current loop includes a second operational amplifier, the positive input end of the second operational amplifier is connected with a current reference port, the negative input end of the second operational amplifier is connected with a current feedback port, the output end of the second operational amplifier is connected with the collector of the triode, and the second capacitor and the third capacitor are connected in parallel between the output end of the second operational amplifier and the negative input end of the second operational amplifier.
[0014] The above technical solution introduces the second operational amplifier to improve the precision and response speed of current control. At the same time, the output end of the second operational amplifier is connected with the collector of the triode, further enhancing the reliability of current control.
[0015] As a further technical solution, two parallel resistors are arranged between the output end of the second operational amplifier and the transistor, and the other ends of the two parallel resistors are connected to the emitter of the transistor.
[0016] As a further technical solution, the model numbers of the first operational amplifier and the second operational amplifier are both AiP224Sa14.
[0017] As a further technical solution, the model number of the controller is STM32F103RCT6 / LQFP-64.
[0018] As a further technical solution, the model number of the PWM control chip is UCC27324P / DIP-8.
[0019] Compared with the prior art, the utility model has the beneficial effects that:
[0020] 1、The utility model discloses a controller is connected voltage loop and current loop simultaneously, and the output end of both is connected to PWM control chip, realizes the double control of output voltage and current, helps to improve the stability and response speed of circuit.
[0021] 2、The voltage loop and current loop arranged in the utility model can work independently or cooperatively according to actual demand, to realize accurate regulation to output voltage and current.
[0022] 3、The utility model discloses the setting voltage loop ensures output voltage stability, through the setting of current loop, realizes accurate control at multiple current limiting points, makes the circuit can adapt to the demand of multiple current limiting points of same output, improves the flexibility and adaptability of circuit.
[0023] 4、The utility model discloses the setting of current loop can limit current quickly when output current exceeds preset value, prevents circuit overload or damage. Good solution has one current limiting point problem of one power supply equipment, to reach maximum current limiting point must increase power, volume etc. Effectively control hardware cost and equipment volume. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 A control circuit structure schematic view suitable for multiple current limiting points control of same output is provided for the utility model embodiment;
[0025] Figure 2 The detailed circuit schematic view of voltage loop and current loop in the utility model embodiment. DETAILED DESCRIPTION
[0026] The technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0027] As shown in Figure 1 The utility model discloses an adaptive control circuit of multiple current limiting point control of same output, comprising: voltage loop and current loop;
[0028] The input end of voltage loop is equipped with voltage reference port and voltage feedback port, voltage reference port is connected with controller, voltage feedback port is used to access actual voltage feedback value, and the controller is MCU as shown in Figure 2
[0029] The input end of current loop is equipped with current reference port and current feedback port, and current reference port is connected with controller, and current feedback port is used to access actual current feedback value.
[0030] The output end of voltage loop and the output end of current loop are connected with PWM control chip respectively, and the output end of current loop is equipped with triode between PWM control chip, and triode is turned on when actual current feedback value is greater than reference current.
[0031] Voltage loop is used for comparing feedback voltage signal and voltage reference signal, adjusting the stability of voltage loop, and adjusting the output of PWM control chip signal through PWM control chip, forming closed loop control to maintain the stability of voltage loop output.
[0032] Current loop is used for comparing current feedback signal and current reference signal, and when current feedback signal exceeds current reference signal, the output of PWM control chip signal is adjusted through PWM control chip, closed loop control is formed to maintain the stability of current loop output, and current limiting control is realized.
[0033] PWM control chip is used for adjusting the output of PWM control chip according to the signal condition of voltage loop and current loop, forming closed loop control to maintain the stability of overall output.
[0034] In addition, triode V3 normally works in amplification area, and the current size in amplification area can be adjusted.
[0035] The specific process is as follows: after the power supply equipment is started, the controller initially outputs a larger current reference signal XL_max for limiting the maximum impact current, at this time, no matter how large the actual current is, it will be limited to XL_max current reference value by triode V3, and constant current output is carried out according to the value, and the equipment is protected.
[0036] After the preset time t1, if the actual current does not decrease to less than the preset minimum current limiting point XL_min, the current limiting control is performed according to XL_min; when the actual current is less than XL_min, the controller outputs XL_max again to prepare for the next current impact, so as to meet multiple impact loads.
[0037] It should be noted that the preset time, i.e., the current limiting point time, is relatively small, and t1 is generally between tens of ms to 1s, and the time can be set.
[0038] In addition, it should be noted that the control method involved in the present application can be realized by using the program in the existing controller.
[0039] In the embodiments of the present application, the controller is connected to the voltage loop and the current loop at the same time, and the output ends of the two are connected to the PWM control chip, realizing double control of the output voltage and current, which helps to improve the stability and response speed of the circuit. The voltage loop ensures the stability of the output voltage, and the current loop can be accurately controlled at multiple current limiting points, so that the circuit can adapt to the demand of multiple current limiting points for the same output, improving the flexibility and adaptability of the circuit. The voltage loop and the current loop can work independently or cooperatively according to actual needs to realize accurate adjustment of the output voltage and current. Through the setting of the current loop, when the output current exceeds the preset value, the current can be quickly limited to prevent the circuit from being overloaded or damaged. It well solves the problem of only one current limiting point for a power supply device, and the problem of increasing power and size to achieve the maximum current limiting point. The hardware cost and the size of the device are effectively controlled.
[0040] As shown in Figure 2 The voltage loop includes a first operational amplifier N1A, the positive input end of the first operational amplifier N1A is connected to a voltage reference port, the negative input end of the first operational amplifier N1A is connected to a voltage feedback port, the output end of the first operational amplifier N1A is connected to the PWM control chip, the output end of the first operational amplifier N1A is connected in series with the first capacitor and the first resistor between the negative input end of the first operational amplifier N1A, and the output end of the first operational amplifier N1A is also connected to the base of the triode.
[0041] In the embodiments of the present application, the first operational amplifier N1A is introduced as the core element of the voltage loop, which enhances the stability and precision of voltage control. At the same time, the output end of the first operational amplifier N1A is connected to the base of the triode V3, so that when the current exceeds the current limiting point, the triode V3 can be quickly turned on, thereby realizing effective control of the current.
[0042] As shown in Figure 2As shown, the current loop comprises a second operational amplifier N1C, the positive input end of the second operational amplifier N1C is connected with the current reference port, the negative input end of the second operational amplifier N1C is connected with the current feedback port, the output end of the second operational amplifier N1C is connected with the collector of the triode, and the second capacitor and the third capacitor are connected in parallel between the output end of the second operational amplifier N1C and the negative input end of the second operational amplifier N1C.
[0043] In the embodiment of the utility model, the second operational amplifier N1C is introduced to improve the precision and response speed of current control. Meanwhile, the output end of the second operational amplifier N1C is connected with the collector of the triode V3, further enhancing the reliability of current control.
[0044] Wherein, between the output end of the second operational amplifier N1C and the triode V3, two parallel resistors R52 and R54 are arranged, the other end of the two parallel resistors R52 and R54 is connected with the emitter of the triode, and the resistor R52 is further connected in series with a ground-connected capacitor C28.
[0045] It should be noted that in the embodiment of the utility model, the model of the first operational amplifier N1A and the second operational amplifier N1C is AiP224Sa14; the model of the controller is STM32F103RCT6 / LQFP-64; and the model of the PWM control chip is UCC27324P / DIP-8.
[0046] As shown in the figure, Figure 2 In the embodiment of the utility model, a resistor R19, a capacitor C11 and a capacitor C12 are arranged on the voltage reference port, and the other end of the capacitor C11 and the capacitor C12 is grounded.
[0047] As shown in the figure, Figure 2 Among them, the first operational amplifier N1A is provided with a power supply, and a ground-connected capacitor C8 is connected between the power supply and the first operational amplifier N1A, and the first operational amplifier N1A is grounded.
[0048] In the embodiment, a ground-connected capacitor C5 and a resistor R26 are further connected between the first resistor R31 and the voltage feedback port, and the capacitor C5 and the resistor R26 are connected in parallel with the wire between the first resistor R31 and the voltage feedback port.
[0049] As shown in the figure, Figure 2 As shown in the figure, a resistor R34 is further arranged between the output end of the first operational amplifier N1A and the base of the triode, the resistor R34 can play a role of current limiting and voltage reduction, preventing the output current from being too large or the output voltage from being too high to cause damage to the load.
[0050] The working principle of the above embodiment is that the controller outputs a voltage reference and a current reference to a voltage loop and a current loop through a voltage reference port and a current reference port respectively, the first operational amplifier N1A compares the voltage reference with an actual voltage feedback signal after the other input end of the voltage loop receives the actual voltage feedback signal, adjusts the stability of the voltage loop, the PWM control chip controls the output of the PWM control chip signal to form a closed loop control to maintain the stability of the output of the voltage loop; the current loop compares the current feedback signal with the current reference after receiving the current feedback signal, when the value of the incoming current feedback signal exceeds the current reference, then the PWM control chip controls the output of the PWM control chip signal to form a closed loop control to maintain the stability of the output of the current loop, that is, to carry out current limiting control.
[0051] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A control circuit adapted to control a plurality of current limit points for the same output, characterized in that, The application relates to a voltage loop and a current loop. The input end of the voltage loop is provided with a voltage reference port and a voltage feedback port, the voltage reference port is connected with a controller, and the voltage feedback port is used for accessing an actual voltage feedback value. The input end of the current loop is provided with a current reference port and a current feedback port, the current reference port is connected with the controller, and the current feedback port is used for accessing an actual current feedback value. The output end of the voltage loop and the output end of the current loop are respectively connected with a PWM control chip, a triode is arranged between the output end of the current loop and the PWM control chip, and the triode is turned on when the actual current feedback value is greater than a reference current. The voltage loop comprises a first operational amplifier, the positive input end of the first operational amplifier is connected with the voltage reference port, the negative input end of the first operational amplifier is connected with the voltage feedback port, the output end of the first operational amplifier is connected with the PWM control chip, a first capacitor and a first resistor are connected in series between the output end of the first operational amplifier and the negative input end of the first operational amplifier, and the output end of the first operational amplifier is further connected with the base of the triode.
2. The control circuit according to claim 1, wherein The current loop comprises a second operational amplifier, the positive input end of the second operational amplifier is connected with the current reference port, the negative input end of the second operational amplifier is connected with the current feedback port, the output end of the second operational amplifier is connected with the collector of the triode, and a second capacitor and a third capacitor are connected in parallel between the output end of the second operational amplifier and the negative input end of the second operational amplifier.
3. The control circuit according to claim 2, wherein Two parallel resistors are arranged between the output end of the second operational amplifier and the triode, and the other ends of the two parallel resistors are connected with the emitter of the triode.
4. The control circuit according to claim 3, wherein The models of the first operational amplifier and the second operational amplifier are both AiP224Sa14.
5. The control circuit according to claim 3, wherein The model of the controller is STM32F103RCT6 / LQFP-64.
6. The control circuit according to claim 1, wherein The model of the PWM control chip is UCC27324P / DIP-8.
7. The control circuit according to claim 1, wherein