A power supply control circuit, method and chip

Abstract

The present disclosure relates to a power supply control circuit, method and chip, the power supply control circuit comprising: a compensation module and a pulse width modulation module; the compensation module is used for receiving a reference voltage and an output voltage of a power module, and performing compensation processing based on an error signal of the output voltage and the reference voltage, to generate a feedback control signal sent to the pulse width modulation module; the pulse width modulation module is used for adjusting a duty cycle of a pulse signal output to the power module based on the feedback control signal, so that the power module adjusts the output voltage based on the pulse signal of the pulse width modulation module. The present disclosure adjusts the transient characteristics and ripple characteristics of the output voltage by digitally adjusting the compensation error signal, effectively improving the performance of the power chip system.

Description

A power control circuit, method and chip Technical Field

[0001] This disclosure relates to the field of power supply technology, and in particular to a power control circuit, method and chip. Background Technology

[0002] Power management systems are currently classified into two types based on the type of signal: analog power chips and digital power chips. Analog power chips control equipment based on continuous electrical signals, while digital power chips discretize continuous electrical signals, that is, convert analog signals into digital signals, and then manage equipment by controlling digital signals.

[0003] In existing power supply circuits, analog power chips are controlled by analog signals, resulting in poor ripple characteristics, slow voltage response, and easy damage to components by transient voltages. Their anti-interference performance is also generally poor, leading to unstable signals in the power supply circuit. Summary of the Invention

[0004] To solve the above-mentioned technical problems, or at least partially solve them, this disclosure provides a power control circuit, method, and chip that adjusts the transient and ripple characteristics of the output voltage by digitally adjusting the compensation error signal, thereby effectively improving the performance of the power chip system.

[0005] In a first aspect, this disclosure provides a power supply control circuit, including:

[0006] Compensation module and pulse width modulation module;

[0007] The compensation module is used to receive a reference voltage and the output voltage of the power supply module, and to perform compensation processing based on the error signal between the output voltage and the reference voltage to generate a feedback control signal and send it to the pulse width modulation module; the pulse width modulation module is used to adjust the duty cycle of the pulse signal output to the power supply module based on the feedback control signal, so that the power supply module adjusts the output voltage based on the pulse signal of the pulse width modulation module.

[0008] In some embodiments, the compensation module includes: an error signal synthesis unit, an analog-to-digital conversion unit, and a proportional-integral-derivative control unit;

[0009] The error signal synthesis unit is used to receive the output voltage and the reference voltage, obtain an error signal based on the output voltage and the reference voltage, and send it to the analog-to-digital conversion unit; the analog-to-digital conversion unit is used to perform analog-to-digital conversion on the error signal and send it to the proportional-integral-derivative control unit; the proportional-integral-derivative control unit is used to compensate for the error signal after analog-to-digital conversion by adjusting the proportional control parameter, integral control parameter and derivative control parameter according to the system transfer function, so as to obtain a feedback control signal.

[0010] In some embodiments, the proportional-integral-derivative control unit includes: a feedback voltage-controlled oscillator, a first voltage-controlled delay line, a second voltage-controlled delay line, and a first capacitor;

[0011] The feedback voltage-controlled oscillator integrates the error signal to obtain a first error signal; the first voltage-controlled delay line performs proportional adjustment on the error signal and the first error signal to obtain a second error signal; the second voltage-controlled delay line performs differential adjustment on the second error signal and the third error signal to obtain a feedback control signal, which is sent to the pulse width modulation module.

[0012] Wherein, the first error signal is an error signal obtained by integrating the error signal; the second error signal is an error signal obtained by adjusting the error signal and the first error signal using a proportional element; and the third error signal is an error signal obtained by passing the error signal through the first capacitor.

[0013] In some embodiments, the compensation module further includes: a signal modulation unit;

[0014] The signal modulation unit is electrically connected to the integral-differential control unit;

[0015] The signal modulation unit is used to adjust the frequency and phase of the internal oscillation signal so that the feedback control signal is stably output to the pulse width modulation module.

[0016] In some embodiments, the signal modulation unit includes: a phase detector, a low-pass filter, and a voltage-controlled oscillator;

[0017] The first input terminal of the phase detector is electrically connected to the input terminal of the signal modulation unit; the second input terminal of the phase detector is electrically connected to the output terminal of the signal modulation unit; the output terminal of the phase detector is electrically connected to the input terminal of the low-pass filter; the output terminal of the low-pass filter is electrically connected to the input terminal of the voltage-controlled oscillator; the output terminal of the voltage-controlled oscillator is the output terminal of the signal modulation unit.

[0018] The phase detector is used to receive the feedback control signal sent by the proportional-integral-derivative control unit and the feedback control signal output by the signal modulation unit, obtain the phase difference between the two, and convert it into a voltage signal; the low-pass filter filters out high-frequency noise in the voltage signal to obtain the control voltage; the voltage-controlled oscillator is used to adjust the frequency of the output signal according to the control voltage.

[0019] In some embodiments, a filtering module is also included;

[0020] The input terminal of the filtering module is electrically connected to the output terminal of the compensation module; the output terminal of the filtering module is electrically connected to the input terminal of the pulse width modulation module.

[0021] The filtering module is used to filter high-frequency signals in the feedback output signal.

[0022] Secondly, this disclosure also provides a power control method applicable to the power control module described in any of the first aspects, comprising:

[0023] Obtain the output voltage of the power module;

[0024] The error signal is determined based on the output voltage and the reference voltage;

[0025] The error signal is compensated to form a feedback control signal, so that the power supply module adjusts the output voltage based on the pulse signal of the pulse width modulation module.

[0026] Thirdly, this disclosure also provides a power control chip, including the power control circuit as described in any of the claims of the first aspect.

[0027] In some embodiments, it further includes: a power supply module;

[0028] The power module is electrically connected to the compensation module; the power module is also electrically connected to the pulse width modulation module;

[0029] The power supply module is used to adjust the output voltage according to the pulse signal of the pulse width modulation module and send it to the load circuit and the compensation module.

[0030] In some embodiments, the power module includes a step-down converter module;

[0031] The buck converter module includes a switching element, an inductor, a freewheeling diode, a second capacitor, and a load resistor. When the switching element is turned on, the buck converter module supplies power to the inductor, the second capacitor, and the load circuit through the input terminal of the power module. When the switching element is turned off, the inductor and the second capacitor supply power to the load circuit.

[0032] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0033] The power control circuit disclosed herein includes a compensation module and a pulse width modulation (PWM) module. The compensation module receives a reference voltage and the output voltage of the power module, performs compensation processing based on the error signal between the output voltage and the reference voltage, and generates a feedback control signal to be sent to the PWM module. The PWM module adjusts the duty cycle of the pulse signal output to the power module based on the feedback control signal, so that the power module adjusts its output voltage based on the pulse signal from the PWM module. The output voltage of the power module fluctuates, and the compensation module can determine the difference between the output voltage and the desired voltage, obtaining an error signal. Due to the existence of this error signal, the duty cycle of the pulse signal output by the PWM module to the power module is inaccurate, thus affecting the output voltage of the power module. The compensation module can compensate for the error signal, generate a feedback control signal, and adjust the duty cycle of the pulse signal output to the power module, thereby controlling and adjusting the output voltage of the power module. This disclosure effectively improves the performance of the power chip system by digitally adjusting and compensating for the error signal, thereby adjusting the transient and ripple characteristics of the output voltage. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of a power control circuit provided in an embodiment of this disclosure;

[0037] Figure 2 is a schematic diagram of another power control circuit provided in an embodiment of this disclosure;

[0038] Figure 3 is a schematic diagram of a proportional-integral-derivative control unit provided in an embodiment of this disclosure;

[0039] Figure 4 is a schematic diagram of another power control circuit provided in an embodiment of this disclosure;

[0040] Figure 5 is a schematic diagram of another power control circuit provided in an embodiment of this disclosure;

[0041] Figure 6 is a schematic flowchart of a power control method provided in an embodiment of this disclosure;

[0042] Figure 7 is a schematic diagram of the structure of a power module provided in an embodiment of this disclosure. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0044] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0045] Figure 1 is a schematic diagram of a power control circuit provided in an embodiment of the present disclosure. As shown in Figure 1, the power control circuit provided in this embodiment includes: a compensation module 10 and a pulse width modulation module 20.

[0046] The compensation module 10 receives the reference voltage and the output voltage of the power supply module 30, and performs compensation processing based on the error signal between the output voltage and the reference voltage to generate a feedback control signal that is sent to the pulse width modulation module 20. The pulse width modulation module 20 adjusts the duty cycle of the pulse signal output to the power supply module 30 based on the feedback control signal, so that the power supply module 30 adjusts its output voltage based on the pulse signal from the pulse width modulation module.

[0047] Specifically, in the voltage control circuit, the power supply module 30 outputs voltage to the load. However, the voltage is subject to interference during the output process, possibly from external environmental signals or sudden signal changes, leading to an error between the output voltage and the voltage required by the load. This affects the overall circuit performance. To avoid this, a compensation module 10 is included in the circuit to receive the output voltage from the power supply module 30. A reference voltage is also provided, which controls the output voltage value. Ideally, the reference voltage value is the same as the output voltage value. However, due to errors, the output voltage value differs from the reference voltage value. The compensation module 10 obtains the voltage difference between the output voltage and the reference voltage; this voltage difference is the error signal. Furthermore, the compensation module 10 digitally compensates for the error signal. When subjected to external interference, primarily changes in input voltage and load, the output voltage may oscillate or fail to recover to its rated value for an extended period. The compensation module 10 compensates for factors causing system instability, eliminates errors, and outputs a feedback control signal to the pulse width modulation module 20. Under the action of the feedback control signal, the pulse width modulation module 20 adjusts the duty cycle of the pulse signal output to the power supply module 30, causing the power supply module 30 to adjust its output voltage based on the pulse signal from the pulse width modulation module 20, forming a feedback loop. When the output voltage of the power supply module 30 is affected by external factors, load, or other factors, causing a deviation from the ideal output value, the compensation module 10 and the pulse width modulation module 20 adjust the output voltage of the power supply module 30 to restore its output value to the ideal state. The unstable factors in the power control circuit are compensated separately, improving the system's ripple characteristics and response speed, thereby preventing sudden signal breakdowns in the circuit and protecting the components.

[0048] In this embodiment, the output voltage of the power module fluctuates. The compensation module can determine the difference between the output voltage and the desired voltage, obtaining an error signal. Due to the presence of this error signal, the duty cycle of the pulse signal output by the pulse width modulation module to the power module is inaccurate, thus affecting the output voltage of the power module. The compensation module can compensate for the error signal, generating a feedback control signal to adjust the duty cycle of the pulse signal output to the power module, thereby controlling and adjusting the output voltage of the power module. This disclosure effectively improves the performance of the power chip system by digitally adjusting and compensating for the error signal, thereby adjusting the transient and ripple characteristics of the output voltage.

[0049] In some embodiments, FIG2 is a schematic diagram of another power control circuit provided in the present disclosure. As shown in FIG2, the compensation module 10 includes: an error signal synthesis unit 11, an analog-to-digital conversion unit 12, and a proportional-integral-derivative control unit 13.

[0050] Error signal synthesis unit 11 receives the output voltage and reference voltage, obtains an error signal based on the output voltage and reference voltage, and sends it to analog-to-digital conversion unit 12. Analog-to-digital conversion unit 12 performs analog-to-digital conversion on the error signal and sends it to proportional-integral-derivative control unit 13. Proportional-integral-derivative control unit 13 compensates for the analog-to-digital converted error signal by adjusting the proportional control parameters, integral control parameters, and derivative control parameters according to the system transfer function, thereby obtaining a feedback control signal.

[0051] Specifically, the compensation module 10 includes an error signal synthesis unit 11. The error signal synthesis unit 11 acquires the output voltage value from the power module 30 to the load and simultaneously receives a set reference voltage. The error between the two values ​​can be obtained at the error signal synthesis unit 11. For example, if the output voltage is 4.8V and the set reference voltage is 5V, and both are input to the error signal synthesis unit 11, an error signal of 0.2V can be obtained. The error signal synthesis unit 11 can be an adder or other electronic components; this embodiment does not impose any limitations on its use.

[0052] The compensation module 10 also includes an analog-to-digital converter (ADC) 12. Since the output voltage and reference voltage of the power supply module 30 are both analog signals, the resulting error signal is also an analog signal. However, in this embodiment, digital compensation is used, so the analog signal needs to be converted to a digital signal before compensation. An ADC 12 can be provided to transmit the error signal obtained in the error signal synthesis unit 11 to the ADC 12, such as an analog-to-digital converter. The ADC samples, analyzes, quantizes, and encodes the error signal, converting the time-continuous and amplitude-continuous analog signal into a time-discrete and amplitude-discrete digital signal, thus realizing the conversion of the error signal from analog to digital.

[0053] The compensation module 10 also includes a proportional-integral-derivative (PID) control unit 13. The compensation module 10 primarily compensates for the error signal, thereby controlling the duty cycle of the pulse signal output from the pulse width modulation module to the power supply module. The compensation is performed by the PID control unit 13. The PID control unit 13 includes proportional control, integral control, and derivative control. It adjusts the error signal based on the system transfer function, calculates the control quantity using the error signal, and then determines the feedback control parameters. In proportional control, the controller output is proportional to the input error signal; when only proportional control is used, the system output exhibits a steady-state error. In integral control, the controller output is proportional to the integral of the input error signal. To eliminate steady-state error, an "integral term" must be introduced into the controller. The integral term depends on the integral of the error over time. As time increases, the integral term increases; even if the error is small, the integral term will still increase over time, driving the controller output to increase and further reduce the steady-state error until it equals zero. Therefore, combining proportional control with integral control can ensure that the system has no steady-state error after reaching steady state. In derivative control, the controller's output is proportional to the derivative of the input error signal (i.e., the rate of change of the error). Derivative control can predict the trend of error change. Combining proportional control with derivative control can make the control action that suppresses the error equal to zero or even negative in advance, avoiding severe overshoot of the controlled variable. For controlled objects with large inertia or lag, combining proportional control with derivative control can improve the dynamic characteristics of the system during the adjustment process.

[0054] The parameter tuning of the proportional-integral-derivative (PID) control unit 13 is a core aspect of control system design. Based on the characteristics of the controlled process, the proportional gain, integral time, and derivative time of each control unit can be determined. Parameter tuning methods mainly include theoretical calculation and engineering tuning. Theoretical calculation determines the controller parameters based on the system's mathematical model through theoretical calculations. Engineering tuning, on the other hand, is performed directly in the control system's testing, with final adjustments and refinements made during actual operation. This method is simple, easy to master, and widely used in engineering practice.

[0055] For example, when tuning proportional control using the engineering tuning method, the proportional control seat is gradually increased, and the response is observed for each iteration until a response curve with fast response and small overshoot is obtained, indicating that the proportional control adjustment is complete. If the steady-state error under proportional control does not meet the requirements, integral control needs to be added. First, the proportional coefficient selected in the above steps is reduced to 50-80% of its original value, and then the integral time is set to a larger value, and the response curve is observed. Then, the integral time is reduced, the integral action is increased, and the proportional coefficient is adjusted accordingly. This process is repeated until a satisfactory response is obtained, and the proportional and integral parameters are determined. If, after the above steps, proportional-integral control can only eliminate steady-state error, but the dynamic process is not satisfactory, derivative control should be added to form proportional-integral-derivative (PID) control. The derivative time is initially set to 0, and the derivative time is gradually increased, while the proportional coefficient and integral time are changed accordingly. This process is repeated until a satisfactory control effect and PID control parameters are obtained.

[0056] By solving the system transfer function and then decomposing it into several parts, each is compensated and controlled separately, forming three main control parameters for adjustment: proportional control parameter Kp, integral control parameter Ki, and derivative control parameter Kp. This achieves a more robust signal transmission effect in the system function. Compared with traditional analog power supply chips or average current analog-to-digital control power supply chips, amplifiers or analog-to-digital converters are no longer necessary. Depending on the specific module to be compensated, various power supply chip system architectures can be used, such as phase-locked loop (PLL) base / analog-to-digital converter base. The core essence of these architectures lies in representing the transient characteristics and ripple characteristics of the output voltage as circuit modules controlled by three key parameters represented by the proportional-integral-derivative (PID) principle, thereby effectively improving the performance of the power supply chip system. This precise control method can currently achieve output ripple of less than 10mV and transient response performance within 1µs.

[0057] In some embodiments, FIG3 is a schematic diagram of a proportional-integral-derivative control unit provided in this disclosure. As shown in FIG3, the proportional-integral-derivative control unit 13 includes: a feedback voltage-controlled oscillator 131, a first voltage-controlled delay line 132, a second voltage-controlled delay line 133, and a first capacitor C1.

[0058] The feedback voltage-controlled oscillator 131 performs integral adjustment on the error signal to obtain a first error signal. The first voltage-controlled delay line 132 performs proportional adjustment on the error signal and the first error signal to obtain a second error signal. The second voltage-controlled delay line 133 performs differential adjustment on the second error signal and the third error signal to obtain a feedback control signal, which is sent to the pulse width modulation module 20.

[0059] The first error signal is the error signal obtained by integrating and adjusting the error signal; the second error signal is the error signal obtained by adjusting the error signal and the first error signal by a proportional element; and the third error signal is the error signal obtained after passing the error signal through the first capacitor.

[0060] For example, a feedback voltage-controlled oscillator 131 is provided in the proportional-integral-derivative control unit 13 to integrally adjust the error signal output by the analog-to-digital converter unit, thereby obtaining a first error signal. A first voltage-controlled delay line 132 is provided for proportional adjustment. The first voltage-controlled delay line 132 receives the error signal output by the analog-to-digital converter unit and the first error signal output by the feedback voltage-controlled oscillator 131, and outputs a second error signal after proportional adjustment. A second voltage-controlled delay line 133 is also provided for derivative adjustment. The second voltage-controlled delay line 133 receives the third error signal output by the analog-to-digital converter unit and passing through the first capacitor C1, and receives the second error signal output by the first voltage-controlled delay line 132, and outputs a feedback control signal after derivative adjustment. The adjusted feedback control signal is sent to the pulse width modulation module 20 to control the duty cycle of the pulse signal output by the power supply module. A resistor R1 may also be included, with its first end connected between the first capacitor C1 and the second voltage-controlled delay line 133, and its second end grounded. Resistor R1 protects the circuit from damage caused by sudden current changes.

[0061] It should be noted that the specific structure of the proportional-integral-derivative control unit is not limited in the embodiments disclosed herein. The above embodiments are only illustrative examples, and other circuit structures can also be used to construct the proportional-integral-derivative control unit.

[0062] In some embodiments, FIG4 is a schematic diagram of another power control circuit provided in the present disclosure. As shown in FIG4, the compensation module 10 further includes a signal modulation unit 14.

[0063] The signal modulation unit 14 is electrically connected to the integral and differential control unit 13.

[0064] The signal modulation unit 14 is used to adjust the frequency and phase of the internal oscillation signal so that the feedback control signal is stably output to the pulse width modulation module.

[0065] Specifically, because digital power management systems operate at very high frequencies, reaching several megahertz, tens of megahertz, or even higher, a phase-locked loop (PLL) is used to unify and integrate clock signals to ensure correct data access in memory. This allows high-frequency devices to operate normally, achieving a stable and high-frequency clock signal. To obtain a high-precision oscillation frequency, a quartz crystal oscillator is typically used. However, the frequency of a quartz crystal oscillator is not easily changed. Using frequency synthesis techniques such as PLLs, frequency multiplication, and frequency division, multi-frequency, highly stable oscillation signals can be obtained. Therefore, signal modulation of the output feedback control signal is necessary. The PLL is a phase feedback control system. In a digital PLL, because the error control signal is a discrete digital signal rather than an analog voltage, the change in the controlled output voltage is discrete rather than continuous. Furthermore, all loop components are implemented using digital circuits; hence, this type of PLL is called a fully digital PLL. Using a fully digital PLL allows adjustment of the phase and frequency of the output feedback control signal to meet the requirements of high-frequency operation, expanding the applicability of the power supply circuit and satisfying high-frequency demands.

[0066] In some embodiments, as shown in FIG4, the signal modulation unit 14 includes a phase detector 141, a low-pass filter 142, and a voltage-controlled oscillator 143.

[0067] The first input terminal of the phase detector 141 is electrically connected to the input terminal of the signal modulation unit 14, the second input terminal of the phase detector 141 is electrically connected to the output terminal of the signal modulation unit 14, the output terminal of the phase detector 141 is electrically connected to the input terminal of the low-pass filter 142, the output terminal of the low-pass filter 142 is electrically connected to the input terminal of the voltage-controlled oscillator 143, and the output terminal of the voltage-controlled oscillator 143 is the output terminal of the signal modulation unit 14.

[0068] Phase detector 141 receives the feedback control signal sent by proportional-integral-derivative control unit 13 and the feedback control signal output by signal modulation unit 14, obtains the phase difference between the two, and converts it into a voltage signal. Low-pass filter 142 filters out high-frequency noise in the voltage signal to obtain the control voltage. Voltage-controlled oscillator 143 is used to adjust the frequency of the output signal according to the control voltage.

[0069] For example, the signal modulation unit 14 can be a phase-locked loop (PLL), which may include a phase detector 141, a low-pass filter 142, and a voltage-controlled oscillator (VCO) 143. The phase detector 141 receives the feedback control signal sent by the proportional-integral-derivative (PID) control unit 13 and the feedback control signal output by the signal modulation unit 14, identifies the phase difference between the two signals, and converts it into a voltage signal. This circuit establishes a definite relationship between the output voltage and the phase difference between the two input signals. The resulting voltage signal can be output to the low-pass filter 142 to filter out high-frequency noise signals and extract its control voltage to control the VCO 143. This improves the spectral purity of the control voltage, enhances system stability, and adjusts the parameters of the PLL, including the stability, spectral purity, and lock-in time of the output signal. Under the control of the control voltage, the VCO 143 generates an output signal whose frequency varies within a reasonable range according to the amplitude of the input signal; this is the feedback control signal. The feedback control signal modulated by the signal modulation unit 14 has good frequency stability, high control sensitivity, wide frequency modulation range, and a linear relationship between frequency deviation and control voltage, making it suitable for integration. The pulse signal formed after being input to the pulse width modulation module 20 has stronger reliability.

[0070] It should be noted that the specific structure of the signal modulation unit in the embodiments disclosed herein is not limited. The above embodiments are merely illustrative examples, and other circuit structures may also be used to construct the signal modulation unit.

[0071] In some embodiments, FIG5 is a schematic diagram of another power control circuit provided in the present disclosure. As shown in FIG5, the power control circuit further includes a filter module 40.

[0072] The input terminal of the filter module 40 is electrically connected to the output terminal of the compensation module 10, and the output terminal of the filter module 40 is electrically connected to the input terminal of the pulse width modulation module 20.

[0073] The filtering module is used to filter high-frequency signals in the feedback output signal.

[0074] In this embodiment of the disclosure, the power control circuit further includes a filtering module 40. After receiving the feedback control signal output by the compensation module 10, the filtering module 40 filters out the high-frequency noise signal therein and transmits the processed feedback control signal to the pulse width modulation module 20, so as to avoid the high-frequency noise signal affecting the feedback control signal to adjust the duty cycle of the pulse signal output by the pulse width modulation module 20.

[0075] Optionally, the above components constitute the digital control section of the digital power chip. Typically, to achieve programmability in this section, an external serial interface, such as an asynchronous serial interface (UART), is connected. This allows the microprocessor and external devices to set parameters for related equipment, enabling programmability, improving system reliability, achieving system miniaturization, facilitating modular power management, and meeting various needs. The compensation module can also be integrated with other modules to meet miniaturized and modular engineering requirements. Furthermore, the digitalization of power management enables diverse remote control capabilities for power devices, bringing numerous benefits to equipment operation and inspection.

[0076] For example, Figure 6 is a schematic flowchart of a power control method provided in an embodiment of this disclosure. As shown in Figures 1 and 6, this disclosure also provides a power control method applicable to any power control circuit provided in the above embodiments. The method includes S110 to S130:

[0077] S110, Obtain the output voltage of the power module.

[0078] Specifically, the output voltage of the power module 30 is obtained. The output voltage of the power module 30 supplies power to the load, but the output voltage is subject to signal interference, which may come from environmental interference or signal mutations, causing the output voltage to be inconsistent with the ideal output voltage value. Therefore, it is necessary to obtain the output voltage of the power module to get the voltage value.

[0079] S120. Determine the error signal based on the output voltage and the reference voltage.

[0080] A reference voltage is also set. The voltage value of the reference voltage is the voltage value of the output voltage under ideal conditions. The compensation module 10 receives the output voltage and the reference voltage. Based on the output voltage and the reference voltage, the difference between the two can be obtained, that is, the error voltage value, and the error signal is determined.

[0081] S130. Compensate for the error signal to form a feedback control signal, so that the power supply module adjusts the output voltage based on the pulse signal of the pulse width modulation module.

[0082] Error signals cause deviations in the output signal of the entire power supply circuit. Therefore, it is necessary to compensate for the error signals and eliminate their influence. The compensation module 10 compensates for the error signals to form a feedback control signal. Under the action of the feedback control signal, the pulse width modulation module 20 adjusts the duty cycle of the pulse signal output to the power supply module 30 to improve the waveform of the output voltage, thereby adjusting the output voltage so that it meets the ideal voltage value, improves the power supply effect of the power control circuit, better meets the working requirements, and enhances the level of intelligence.

[0083] This disclosure also provides a power control chip, including the power control circuit as provided in any of the above embodiments, which has the same or similar beneficial effects, and will not be described in detail here.

[0084] In some embodiments, the power control chip further includes a power module.

[0085] The power module is electrically connected to the compensation module, and the power module is also electrically connected to the pulse width modulation module.

[0086] The power supply module is used to adjust the output voltage according to the pulse signal from the pulse width modulation module and send it to the load circuit and the compensation module.

[0087] Specifically, the power supply module is electrically connected to the input terminal of the compensation module, and the power supply module is also electrically connected to the output terminal of the pulse width modulation module. The voltage output by the power supply module is not only output to the load circuit, but also transmitted to the input terminal of the compensation module. The compensation module obtains the voltage value of the output voltage, combines it with the reference voltage to obtain an error signal, and then compensates the error signal to output a feedback control signal to the pulse width adjustment module. The pulse width adjustment module adjusts the duty cycle of the pulse signal output to the power supply module based on the feedback control signal, thereby adjusting the output voltage of the power supply module.

[0088] In some embodiments, FIG7 is a schematic diagram of a power module provided in an embodiment of the present disclosure. As shown in FIG7, the power module includes a step-down conversion module 31.

[0089] The buck converter module 31 includes a switching element 311, an inductor 312, a freewheeling diode 313, a second capacitor C2, and a load resistor R2. When the switching element 311 is turned on, the buck converter module 31 supplies power to the inductor 312, the second capacitor C2, and the load circuit from the input terminal of the power module. When the switching element 311 is turned off, the inductor 312 and the second capacitor C2 supply power to the load circuit.

[0090] For example, the switching element 311 is turned on and off by the pulse signal output by the pulse width adjustment module. For example, when the signal is high, the switching element 311 is turned on, and the current output from the positive terminal of the power supply Vin passes through the switching element 311 to the inductor 312. The inductor 312 converts electrical energy into magnetic energy for storage. The freewheeling diode 313 can only conduct in one direction, so it is not turned on at this time and no current flows through it. The current reaching the inductor 312 is input to the load resistor R2 to supply power to it, while the second capacitor C2 is in a charging state. The current flows through the load resistor R2 and returns to the negative terminal of the power supply Vin. In this cycle, the inductor is positive on the left and negative on the right. Since the current flowing through inductor 312 cannot change abruptly, the load voltage gradually increases. When the switching element 311 is turned off, the power supply stops supplying power, and the magnetic energy stored in inductor 312 is converted into electrical energy and released. At this time, the positive and negative poles of inductor 312 are reversed (becoming negative on the left and positive on the right), and inductor 312 becomes the power source in the circuit. Since the current flows from the positive pole to the negative pole, the freewheeling diode 313 can carry current at this time, and the current released by inductor 312 gradually decreases, thus completing the voltage reduction function.

[0091] It should be noted that the buck converter module in this embodiment is only an example, and other types of power modules, such as boost converter modules, can also be used, depending on actual needs.

[0092] In other embodiments, the power control chip may also include other structural or functional components known to those skilled in the art, which are not described in detail here nor are they limited.

[0093] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0094] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply control circuit, characterized in that, include: Compensation module and pulse width modulation module; The compensation module is used to receive the reference voltage and the output voltage of the power supply module, and to perform compensation processing based on the error signal between the output voltage and the reference voltage, and generate a feedback control signal to be sent to the pulse width modulation module. The pulse width modulation module is used to adjust the duty cycle of the pulse signal output to the power supply module based on the feedback control signal, so that the power supply module adjusts the output voltage based on the pulse signal of the pulse width modulation module. The compensation module includes: an error signal synthesis unit, an analog-to-digital converter (ADC), and a proportional-integral-derivative (PID) control unit. The error signal synthesis unit receives the output voltage and a reference voltage, obtains an error signal based on the output voltage and the reference voltage, and sends it to the ADC. The ADC performs analog-to-digital conversion on the error signal and sends it to the PID control unit. The PID control unit compensates for the analog-to-digital converted error signal by adjusting proportional control parameters, integral control parameters, and derivative control parameters according to the system transfer function, thereby obtaining a feedback control signal. The PID control unit includes: a feedback voltage-controlled oscillator and a first voltage-controlled oscillator. The system comprises a delay line, a second voltage-controlled delay line, and a first capacitor. The feedback voltage-controlled oscillator integrates the error signal to obtain a first error signal. The first voltage-controlled delay line performs a proportional adjustment on the error signal and the first error signal to obtain a second error signal. The second voltage-controlled delay line performs a differential adjustment on the second error signal and the third error signal to obtain a feedback control signal, which is sent to the pulse width modulation module. The first error signal is obtained by integrating the error signal. The second error signal is obtained by proportional adjustment on the error signal and the first error signal. The third error signal is obtained by passing the error signal through the first capacitor.

2. The power control circuit according to claim 1, characterized in that, The compensation module further includes: a signal modulation unit; the signal modulation unit is electrically connected to the proportional-integral-derivative control unit; the signal modulation unit is used to adjust the frequency and phase of the internal oscillation signal so that the feedback control signal is stably output to the pulse width modulation module.

3. The power control circuit according to claim 2, characterized in that, The signal modulation unit includes a phase detector, a low-pass filter, and a voltage-controlled oscillator (VCO). The first input terminal of the phase detector is electrically connected to the input terminal of the proportional-integral-derivative (PID) control unit. The second input terminal of the phase detector is electrically connected to the output terminal of the PID control unit. The output terminal of the phase detector is electrically connected to the input terminal of the low-pass filter. The output terminal of the low-pass filter is electrically connected to the input terminal of the VCO. The output terminal of the VCO is the output terminal of the signal modulation unit. The phase detector receives the feedback control signal sent by the PID control unit and the feedback control signal output by the signal modulation unit, obtains the phase difference between the two, and converts it into a voltage signal. The low-pass filter filters out high-frequency noise in the voltage signal to obtain a control voltage. The VCO adjusts the frequency of the output signal according to the control voltage.

4. The power control circuit according to claim 1, characterized in that, It also includes a filtering module; the input terminal of the filtering module is electrically connected to the output terminal of the compensation module; the output terminal of the filtering module is electrically connected to the input terminal of the pulse width modulation module; the filtering module is used to filter high-frequency signals in the feedback output signal.

5. A power supply control method, characterized in that, A power control circuit applicable to any one of claims 1-4 includes: acquiring the output voltage of a power module; determining an error signal based on the output voltage and a reference voltage; compensating the error signal to form a feedback control signal, so that the power module adjusts the output voltage based on the pulse signal of the pulse width modulation module.

6. A power control chip, characterized in that, Includes the power control circuit as described in any one of claims 1-4.

7. The power control chip according to claim 6, characterized in that, Also includes: A power supply module; the power supply module is electrically connected to the compensation module; the power supply module is also electrically connected to the pulse width modulation module; the power supply module is used to adjust the output voltage according to the pulse signal of the pulse width modulation module and send it to the load circuit and the compensation module.

8. The power control chip according to claim 7, characterized in that, The power supply module includes a buck converter module; the buck converter module includes a switching element, an inductor, a freewheeling diode, a second capacitor, and a load resistor; the buck converter module is used to supply power to the inductor, the second capacitor, and the load circuit from the input terminal of the power supply module when the switching element is turned on; and to supply power to the load circuit from the inductor and the second capacitor when the switching element is turned off.

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