Optimization method for voltage control of boost module

Abstract

The invention belongs to the technical field of voltage control optimization, and particularly relates to an optimization method for voltage control of a boost module, the optimization method is based on a high-precision voltage sensor, a control chip and the boost module, and the boost module is connected with an input side circuit and an output side circuit; s1, a high-precision voltage sensor collects analog voltage signals of an input side circuit in real time; s2, establishing an input side voltage normal range threshold in boost control software; meanwhile, whether the analog voltage signal of the input side circuit is lower than an input side voltage normal range threshold value or not is judged; and S3, executing a judgment result in the step S2. By adding real-time monitoring and rapid intervention functions in control software of the boost module, dynamic monitoring of the input side voltage is realized. When it is detected that the input side voltage is lower than the normal range, the control software immediately takes measures to reduce the boost target value to be not higher than the current input side voltage, so that the abnormal boost problem is effectively avoided, and safe and stable operation of the system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage control optimization, and in particular to a method for optimizing voltage control of a boost module. Background Art

[0002] The boost module plays a key role in power electronic systems. It uses a boost circuit to increase the lower voltage on the input side to the target voltage for output. It is widely used in new energy power generation, battery energy storage and other fields.

[0003] However, when the input side low-voltage network experiences an abnormal drop (such as a sudden line disconnection, load short circuit, or other faults causing a sudden voltage drop), the traditional boost control strategy cannot adjust the boost target in time due to the lack of a fast response mechanism, resulting in an abnormal increase in the output voltage.

[0004] This abnormal voltage increase will not only damage the downstream electrical equipment, but may also cause safety accidents and seriously affect the stability and reliability of the system. Summary of the Invention

[0005] The object of the present invention is to provide a method for optimizing voltage control of a boost module to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an optimization method for voltage control of a boost module, the optimization method being based on a high-precision voltage sensor, a control chip and a boost module;

[0007] Among them, the boost module is connected to the input side circuit and the output side circuit respectively, the high-precision voltage sensor collects the analog voltage signal of the input side circuit in real time, the boost control software is set in the control chip, and the output of the control chip is connected to the boost module;

[0008] The specific steps of the optimization method for boost module voltage control are as follows:

[0009] S1: In the input side circuit of the boost module, a high-precision voltage sensor collects the analog voltage signal of the input side circuit in real time;

[0010] The analog voltage signal is converted into a digital signal and then transmitted to the control chip;

[0011] S2: Establish the normal range threshold of the input side voltage in the boost control software;

[0012] At the same time, determine whether the analog voltage signal of the input side circuit is lower than the normal range threshold of the input side voltage:

[0013] Yes, the boost control software output intervenes in the boost module. After intervention, the boost target is equal to the input voltage.

[0014] No, the boost control software outputs the boost module without intervention, maintaining the boost target = the original boost target;

[0015] S3: Execute the judgment result in S2.

[0016] Preferably, the high-precision voltage sensor is a Hall voltage sensor or a resistance divider voltage sensor.

[0017] Preferably, the control chip is a high-performance microcontroller or a digital signal processor.

[0018] Preferably, in S2, the normal range threshold of the input side voltage is set according to the design parameters of the boost module and the actual application scenario.

[0019] Preferably, in S2, the control software establishes a normal range threshold of the input side voltage, which is set according to the design parameters of the boost module and the actual application scenario, and sets the lower limit value V of the normal range threshold of the input side voltage min , upper limit value V max , when the analog voltage signal of the input side circuit is detected to be lower than V min When the control software needs to continuously monitor n sampling cycles, the voltage in these n cycles is lower than V min , it is determined that the voltage of the input side circuit is lower than the input side voltage normal range threshold.

[0020] Preferably, when it is determined that the input side voltage has dropped abnormally, the control software immediately starts the voltage boost target intervention program. The specific intervention method is: target Forced to be set to the current input side voltage V in , that is, V target =V in ,To achieve this goal, the boost control software sends ,adjustment instructions to the driver module of the boost ,module through the control signal interface. The driver module adjusts the ,duty cycle of the switch of the boost module according to the ,instructions, thereby changing the output voltage.

[0021] Preferably, a high-precision voltage sensor and a high-precision current sensor are also installed on the output side circuit, and the output voltage V is obtained based on the voltage acquisition of the output side circuit by the high-precision voltage sensor. out , and the set boost target value V target By comparison, the reference current I of the current inner loop is calculated through the PI regulator. ref , high-precision current sensor collects the output side circuit current I L , and the reference current I ref After comparison, the PI regulator generates a PWM signal to control the duty cycle of the power switch tube, thereby achieving the output voltage U out stability control.

[0022] Preferably, the output voltage U of the voltage-regulated PI regulator out The calculation formula is:

[0023] U out =K P1 (V target -V out )+K i1 ∫(V target -V out )dt

[0024] Among them, K P1 is the voltage outer loop proportional coefficient Ki1 is the voltage outer loop integral coefficient;

[0025] The calculation formula for the duty cycle D of the PWM signal generated by the PI regulator for current regulation is:

[0026] D=K P2 (I ref -I L )+K i2 ∫(I ref -I L )dt

[0027] Among them, K P2 K is the current inner loop proportional coefficient, i2 is the integral coefficient of the inner current loop.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] By adding real-time monitoring and rapid intervention capabilities to the boost module's control software, dynamic monitoring of the input voltage is achieved. If the input voltage is detected to be below the normal range, the control software immediately takes measures to lower the boost target value to within the current input voltage, effectively avoiding abnormal boosting and ensuring safe and stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a system logic block diagram of the present invention;

[0031] Figure 2 This is a flow chart of the optimization method of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] Example 1:

[0035] See also Figure 1-2 , the present invention provides a technical solution: a method for optimizing voltage control of a boost module, the optimization method is based on a high-precision voltage sensor, a control chip and a boost module;

[0036] The boost module is connected to the input and output circuits, respectively. A high-precision voltage sensor collects the analog voltage signal from the input circuit in real time. The boost control software is set within the control chip, and the output of the control chip is connected to the boost module. The high-precision voltage sensor is a Hall voltage sensor or a resistor divider voltage sensor. The control chip is a high-performance microcontroller or digital signal processor.

[0037] A high-precision voltage sensor (such as a Hall effect voltage sensor or a resistor divider voltage sensor) is installed in the input circuit of the boost module. This sensor can collect the input voltage signal in real time, convert the analog voltage signal into a digital signal, and transmit it to the control chip (such as a high-performance microcontroller or digital signal processor). To improve monitoring accuracy and reliability, the voltage sensor must have high sensitivity, a wide measurement range, and fast response characteristics. Its sampling frequency should be no less than 10 times the switching frequency of the boost circuit to ensure that it can capture instantaneous voltage changes.

[0038] The specific steps of the optimization method for boost module voltage control are as follows:

[0039] S1: In the input side circuit of the boost module, a high-precision voltage sensor collects the analog voltage signal of the input side circuit in real time;

[0040] The analog voltage signal is converted into a digital signal and then transmitted to the control chip;

[0041] The normal range threshold of the input side voltage is set according to the design parameters of the boost module and the actual application scenario.

[0042] S2: Establish the normal range threshold of the input side voltage in the boost control software;

[0043] At the same time, determine whether the analog voltage signal of the input side circuit is lower than the normal range threshold of the input side voltage:

[0044] Yes, the boost control software output intervenes in the boost module. After intervention, the boost target is equal to the input voltage.

[0045] No, the boost control software outputs the boost module without intervention, maintaining the boost target = the original boost target;

[0046] The control software establishes the normal range threshold of the input side voltage. The threshold is set according to the design parameters of the boost module and the actual application scenario. The lower limit value V of the normal range threshold of the input side voltage is set. min , upper limit value V max , when the analog voltage signal of the input side circuit is detected to be lower than V min When the control software needs to continuously monitor n sampling cycles, the voltage in these n cycles is lower than V min , it is determined that the voltage of the input side circuit is lower than the input side voltage normal range threshold.

[0047] The normal range threshold of the input voltage is established in the boost control software. The normal range threshold of the input voltage is set according to the design parameters of the boost module and the actual application scenario. min Set to 80% of the rated input voltage, V min =0.8V rated ; Upper limit value V max Set to 120% of the rated input voltage, that is, V max =1.2V rated , where V rated is the rated input voltage of the boost module.

[0048] The control software monitors the input voltage V at a fixed time interval Δt (e.g. 1ms). in Take samples.

[0049] At the same time, in order to avoid misjudgment caused by instantaneous voltage fluctuations, when the voltage is detected to be lower than V min The control software needs to continuously monitor n sampling cycles (e.g. n=5). If the voltage is lower than V min , it is determined that the low-voltage network on the input side has an abnormal decrease.

[0050] S3: Execute the judgment result in S2.

[0051] When it is determined that the input voltage drops abnormally, the control software immediately starts the voltage boost target intervention program. The specific intervention method is: target Forced to be set to the current input side voltage V in , that is, V target =V in,To achieve this goal, the boost control software sends ,adjustment instructions to the driver module of the boost ,module through the control signal interface. The driver module adjusts the ,duty cycle of the switch of the boost module according to the ,instructions, thereby changing the output voltage.

[0052] Taking the common Boost circuit as an example, its output voltage V out With input voltage V in , the duty cycle D of the switch tube is: V out =V in / (1-D) When the boost target value needs to be adjusted to V target When the corresponding duty cycle D can be calculated according to the above formula new :

[0053] D new =1-V in / V target

[0054] The control software adjusts the duty cycle of the drive signal to achieve D new , thereby stabilizing the output voltage at the new boost target value V target .

[0055] The core boost unit uses a classic boost circuit (using existing technology, briefly described below). This circuit is a switching DC boost circuit, a type of DC-DC (direct current-to-direct current) converter. Its core function is to boost the input DC voltage to a stable output voltage higher than the input voltage by periodically turning on and off electronic switching devices (such as MOSFETs and IGBTs), combined with the energy storage and release characteristics of energy storage elements (inductors and capacitors).

[0056] Core components:

[0057] The switching element (S) is usually a MOSFET or IGBT, which is periodically turned on and off by a PWM (pulse width modulation) signal.

[0058] The energy storage inductor (L) is used to store and release magnetic field energy and is a key component for achieving voltage boost.

[0059] The output capacitor (C) smoothes the output voltage and suppresses ripple.

[0060] The freewheeling diode (D) provides a current loop for the inductor when the switching element is turned off, avoiding high-voltage spikes.

[0061] Switch on stage: the switch element S is turned on, the input voltage V in When applied to both ends of the inductor L, the inductor current iL rises linearly, and the energy is stored in the inductor in the form of a magnetic field. At this time, the freewheeling diode D is cut off, and the output capacitor C supplies power to the load, maintaining the output voltage Vout .

[0062] Switch off stage: The switch element S is turned off, and the inductor L generates a reverse induced electromotive force (polarity is negative on the left and positive on the right) due to the sudden change of current. After superimposing with the input voltage, it supplies power to the load through the freewheeling diode D and charges the capacitor C at the same time. Output voltage V out Higher than the input voltage V in , to achieve boost.

[0063] Component selection requirements for the Boost circuit:

[0064] Switching components: Consider withstand voltage (should be greater than the maximum output voltage), on-resistance (affects efficiency), and switching speed. Inductor: Select the inductor value based on power and operating mode, taking into account both volume and magnetic saturation characteristics. Capacitor: The output capacitor capacity must meet ripple suppression requirements and have a withstand voltage greater than the peak output voltage.

[0065] Control strategy

[0066] PWM modulation technology is used to achieve output voltage stability through feedback closed loops (such as voltage outer loop and current inner loop).

[0067] Design of safety mechanisms such as overvoltage protection and overcurrent protection.

[0068] The circuit consists of a power switch tube (such as MOSFET), an inductor L, a diode D and an output capacitor C. Under normal working conditions, the power switch tube is periodically turned on and off under the drive of the control signal. When the switch tube is turned on, the input voltage V in The inductor L is charged and energy is stored in the inductor. When the switch is turned off, the energy stored in the inductor L is equal to the input voltage V in After superposition, power is supplied to the output capacitor C and the load through the diode D, thereby increasing the voltage.

[0069] High-precision voltage sensors and high-precision current sensors are also installed on the output side circuit. The output voltage V is obtained based on the voltage acquisition of the output side circuit by the high-precision voltage sensor. out , and the set boost target value V target By comparison, the reference current I of the current inner loop is calculated through the PI regulator. ref , high-precision current sensor collects the output side circuit current I L , and the reference current I ref After comparison, the PI regulator generates a PWM signal to control the duty cycle of the power switch tube, thereby achieving stable control of the output voltage.

[0070] The output voltage U of the PI regulator for voltage regulation out The calculation formula is:

[0071] Uout =K P1 (V target -V out )+K i1 ∫(V target -V out )dt

[0072] Among them, K P1 is the voltage outer loop proportional coefficient Ki1 is the voltage outer loop integral coefficient;

[0073] The calculation formula for the duty cycle D of the PWM signal generated by the PI regulator for current regulation is:

[0074] D=K P2 (I ref -I L )+K i2 ∫(I ref -I L )dt

[0075] Among them, K P2 K is the current inner loop proportional coefficient, i2 is the integral coefficient of the inner current loop.

[0076] When the input side voltage is normal, the output voltage is stabilized at the set boost target value according to the above-mentioned dual closed-loop control strategy; when the input side voltage drops abnormally, the boost target value is adjusted and the dual closed-loop control is used to respond quickly so that the output voltage follows the new target value, avoiding the occurrence of abnormal boost.

[0077] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure signs in the claims should not be regarded as limiting the claims involved.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for optimizing voltage control of a boost module, characterized in that: The optimization method is based on high-precision voltage sensors, control chips and boost modules; Among them, the boost module is connected to the input side circuit and the output side circuit respectively, the high-precision voltage sensor collects the analog voltage signal of the input side circuit in real time, the boost control software is set in the control chip, and the output of the control chip is connected to the boost module; The specific steps of the optimization method for boost module voltage control are as follows: S1: In the input side circuit of the boost module, a high-precision voltage sensor collects the analog voltage signal of the input side circuit in real time; The analog voltage signal is converted into a digital signal and then transmitted to the control chip; S2: Establish the normal range threshold of the input side voltage in the boost control software; At the same time, determine whether the analog voltage signal of the input side circuit is lower than the normal range threshold of the input side voltage: Yes, the boost control software output intervenes in the boost module. After intervention, the boost target is equal to the input voltage. No, the boost control software outputs the boost module without intervention, maintaining the boost target = the original boost target; S3: Execute the judgment result in S2.

2. The method for optimizing voltage control of a boost module according to claim 1, wherein: The high-precision voltage sensor is a Hall voltage sensor or a resistance voltage divider voltage sensor.

3. The method for optimizing voltage control of a boost module according to claim 1, wherein: The control chip is a high-performance microcontroller or a digital signal processor.

4. The method for optimizing voltage control of a boost module according to claim 1, wherein: In S2, the normal range threshold of the input side voltage is set according to the design parameters of the boost module and the actual application scenario.

5. The method for optimizing voltage control of a boost module according to claim 4, wherein: In S2, the control software establishes a normal range threshold for the input side voltage. This threshold is set according to the design parameters of the boost module and the actual application scenario. The lower limit value V of the normal range threshold for the input side voltage is set. min , upper limit value V max , when the analog voltage signal of the input side circuit is detected to be lower than V min When the control software needs to continuously monitor n sampling cycles, the voltage in these n cycles is lower than V min , it is determined that the voltage of the input side circuit is lower than the input side voltage normal range threshold.

6. The method for optimizing voltage control of a boost module according to claim 5, characterized in that: When it is determined that the input voltage drops abnormally, the control software immediately starts the voltage boost target intervention program. The specific intervention method is: target Forced to be set to the current input side voltage V in , that is, V target =V in ,To achieve this goal, the boost control software sends ,adjustment instructions to the driver module of the boost ,module through the control signal interface. The driver module adjusts the ,duty cycle of the switch of the boost module according to the ,instructions, thereby changing the output voltage.

7. The method for optimizing voltage control of a boost module according to claim 6, characterized in that: High-precision voltage sensors and high-precision current sensors are also installed on the output side circuit. The output voltage V is obtained based on the voltage acquisition of the output side circuit by the high-precision voltage sensor. out , and the set boost target value V target By comparison, the reference current I of the current inner loop is calculated through the PI regulator. ref , high-precision current sensor collects the output side circuit current I L , and the reference current I ref After comparison, the PI regulator generates a PWM signal to control the duty cycle of the power switch tube, thereby achieving the output voltage U out stability control.

8. The method for optimizing voltage control of a boost module according to claim 7, wherein: The output voltage U of the PI regulator for voltage regulation out The calculation formula is: U out =K P1 (V target -V out )+K i1 ∫(V target -V out )dt Among them, K P1 is the voltage outer loop proportional coefficient Ki1 is the voltage outer loop integral coefficient; The calculation formula for the duty cycle D of the PWM signal generated by the PI regulator for current regulation is: D=K P2 (I ref -I L )+K i2 ∫(I ref -I L )dt Among them, K P2 K is the current inner loop proportional coefficient, i2 is the integral coefficient of the inner current loop.

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