Load power control circuit and device

Abstract

The invention discloses a load power control circuit and device. The circuit comprises a microcontroller module and one or more controlled modules. The controlled module comprises a controlled load and an MOS switch chip used for current detection, a current output pin of the MOS switch chip and one end of the controlled load are both connected with the input end of the microcontroller module, a control pin of the MOS switch chip is connected with the output end of the microcontroller module, the other end of the controlled load is grounded, and the output end of the microcontroller module is grounded. The current output pin outputs a current detection signal; the microcontroller module generates and sends a PWM control signal to the MOS switch chip according to the current detection signal and the voltage signal; and the MOS switch chip performs power control on the controlled load according to the PWM control signal. The load power control circuit can be compatible with most load working environment control conditions without introducing an additional current or voltage detection circuit, the circuit complexity of system peripherals is greatly reduced, and the load power control circuit has the characteristics of high precision, simplicity, high reliability and the like.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and particularly to a load power control circuit and device. Background Art

[0002] Nowadays, load power control circuits play a crucial role in modern electronic systems, and their core application scenarios are high-precision scenarios such as energy efficiency optimization and equipment safety protection. Generally speaking, the currently commonly used solutions are to use semiconductor electronic switches such as P-type or N-type metal oxide semiconductor field effect transistors, bipolar transistors, or new types of SiC, GaN, etc. switches, which are often applied to the open-loop system power control. That is, when a signal is input, the on / off switching state of the switch is triggered, so as to drive the actual load to achieve the purpose of switching the working state of the load. The power of the load is often directly determined by its own impedance, the on-resistance of the switch, and the supply voltage. Then, adjusting the power supply voltage can directly change the load power, but this is not applicable in most application scenarios.

[0003] Another solution is to use PWM signals for control. This operation can increase or decrease the power seen by the load by intermittently conducting. However, when the load is working, it is often accompanied by effects such as long-term heating / aging, and its on-resistance will also change accordingly. This solution can only relatively increase or decrease the power at a short instantaneous working moment, but the change in resistance will also make the power of the load unpredictable.

[0004] Therefore, the prior art often simultaneously collects the voltage and current signals on the load, and calculates the power load in real time through the signals entering the controller for feedback. The acquisition of the magnitude of the current signal is relatively complex. If it is detected directly, it is difficult to directly connect any source meter in series with the load in most application scenarios. For high-power loads, the design of directly collecting the load voltage and current signals often has relatively high risks. If it is detected indirectly, on the one hand, the forms of loads are diverse, and it is difficult to achieve a current detection technology that is compatible with the load shape, size, working power, etc. under the full working voltage. On the other hand, the additional current acquisition circuit often has difficulty in obtaining high-precision current signals and will additionally increase the cost. And in many working environments, there are relatively high requirements for the acquisition speed and the speed of power change control, and it has to face the problems of high-precision detection, compatibility with high power, high reliability, and high-speed control. Summary of the Invention

[0005] The purpose of this application is to provide a load power control circuit to solve the technical problems existing in the prior art, such as the difficulty of accurately detecting power in the existing load power control circuit, the limitation of current signal detection, and the relatively high cost of introducing additional circuits. The many technical effects that can be produced by the preferred technical solutions provided in this application are described in detail below.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] In a first aspect, a load power control circuit provided by the present application includes a microcontroller module and one or more controlled modules; the controlled module includes a controlled load and a MOS switch chip for current detection. The current output pin of the MOS switch chip and one end of the controlled load are both connected to the input end of the microcontroller module. The control pin of the MOS switch chip is connected to the output end of the microcontroller module. The other end of the controlled load is grounded. The current output pin outputs a current detection signal collected by the MOS switch chip, and the current detection signal represents the current signal of the controlled load. The microcontroller module generates and sends a PWM control signal to the MOS switch chip according to the current detection signal collected by the MOS switch chip and the voltage signal at one end of the controlled load. The MOS switch chip controls the power of the controlled load according to the PWM control signal.

[0008] In some embodiments, the controlled module includes a signal conversion circuit configured to process the current detection signal and the voltage signal, generate a processed signal and send the processed signal to the microcontroller module, and the microcontroller module generates the PWM control signal according to the processed signal.

[0009] In some embodiments, the first input end of the signal conversion circuit is connected to the current output pin, the second input end of the signal conversion circuit is connected to both the input pin of the MOS switch chip and one end of the controlled load, and the output end of the signal conversion circuit is connected to the input end of the microcontroller module.

[0010] In some embodiments, the microcontroller module includes an ADC sampling unit and a data processing unit. The ADC sampling unit is used to collect the processed signal, obtain an analog-to-digital conversion signal and send the analog-to-digital conversion signal to the data processing unit. The data processing unit restores the analog-to-digital conversion signal to obtain a restored signal, and the restored signal represents the current signal and voltage signal of the controlled load.

[0011] In some embodiments, the microcontroller module includes a feedback algorithm unit connected to the data processing unit, and the feedback algorithm unit calculates the real-time impedance and real-time power of the controlled load according to the restored signal.

[0012] In some embodiments, the microcontroller module includes a PWM control output unit, which is connected to the feedback algorithm unit, and the PWM control output unit generates the PWM control signal according to the real-time impedance and the real-time power.

[0013] In some embodiments, the PWM control output unit generates a plurality of the PWM control signals for maintaining a preset constant power or a preset constant temperature of the controlled load according to the change condition of the real-time impedance and the change condition of the real-time power.

[0014] In some embodiments, the MOS switch chip integrates an NMOS transistor. The gate of the NMOS transistor receives the PWM control signal through the control pin. The drain of the NMOS transistor is connected to the power supply through the power pin of the MOS switch chip. The source of the NMOS transistor is connected to one end of the controlled load through the input pin.

[0015] In some embodiments, the load power control circuit includes a resistor R1, a resistor R2, and a resistor R3. One end of the resistor R1 is connected to the current output pin and one input end of the microcontroller module. One ends of the resistor R2 and the resistor R3 are connected to another input end of the microcontroller module. The other ends of the resistor R1 and the resistor R3 are both grounded. The other end of the resistor R2 is connected to one end of the controlled load and the input pin.

[0016] In a second aspect, the present application provides a load power control device, and the load power control device includes the load power control circuit as described above.

[0017] Implementing one of the technical solutions in the above technical solutions of the present application has the following advantages or beneficial effects: In the present application, a MOS switch chip with a current detection function is used to obtain a high-precision current detection signal of the controlled load. The microcontroller module outputs a PWM control signal according to the current detection signal and the voltage signal to perform real-time power control on the controlled load. In this case, the present application can achieve high-precision current acquisition and voltage signal acquisition methods under different voltage domains, input the current detection signal and the voltage signal into the microcontroller module, and accurately control the power of the controlled load through the control of the high-speed PWM control signal. The present application uses a chip with a load current detection function to achieve high-precision load power control, including constant power / specified power curve, constant temperature / variable temperature, stepless power control, etc.; at the same time, the load power control circuit of the present application can be compatible with the control conditions of most load working environments without introducing additional current or voltage detection circuits, greatly reducing the circuit complexity of system peripherals, and having the characteristics of high precision, simplicity, and high reliability. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the load power control circuit according to an embodiment of the present application;

[0020] Figure 2 is a schematic connection diagram of multiple controlled systems according to an embodiment of the present application;

[0021] Figure 3 is a schematic circuit diagram of the load power control circuit according to an embodiment of the present application.

[0022] In the figure: 1. Load power control circuit; 10. Microcontroller module; 20. Controlled module; 21. Controlled load; 22. MOS switch chip; 23. Signal conversion circuit; 11. ADC sampling unit; 12. Data processing unit; 13. Feedback algorithm unit; 14. PWM control output unit. Detailed Embodiments

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, various exemplary embodiments to be described below will refer to the corresponding drawings, which form a part of the exemplary embodiments, and various exemplary embodiments that may implement the present application are described therein. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. It should be understood that they are only examples of processes, methods, devices, etc. consistent with some aspects of the present application disclosed in detail in the appended claims. Other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the orientation shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying a specific orientation that the indicated element must have, a specific orientation structure and operation. The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. The meaning of the term "plurality" is two or more. The terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] In order to illustrate the technical solutions described in the present application, the following will be described through specific embodiments, and only the parts related to the embodiments of the present application are shown.

[0026] As Figure 1 shown, the present application provides a load power control circuit 1, including a microcontroller module 10 and one or more controlled modules 20.

[0027] In some embodiments, the controlled module 20 may include a controlled load 21 and a MOS switch chip 22 for current detection. The current output pin of the MOS switch chip 22 and one end of the controlled load 21 may both be connected to the input end of the microcontroller module 10, the control pin of the MOS switch chip 22 may be connected to the output end of the microcontroller module 10, the other end of the controlled load 21 is grounded, and the current output pin may output the current detection signal collected by the MOS switch chip 22. The current detection signal may characterize the current signal of the controlled load 21.

[0028] In some embodiments, the microcontroller module 10 may generate and send a PWM control signal to the MOS switch chip 22 according to the current detection signal collected by the MOS switch chip 22 and the voltage signal at one end of the controlled load 21. The MOS switch chip 22 may perform power control on the controlled load 21 according to the PWM control signal.

[0029] Specifically, the MOS switch chip 22 may reduce the current signal of the controlled load 21 in a preset ratio and output a current detection signal. At this time, the current signal of the controlled load 21 is equivalent to a current detection signal with high-precision characteristics. Thus, the current signal of the controlled load 21 can be obtained through the MOS switch chip 22 without introducing additional circuit detection costs.

[0030] The voltage signal can be obtained by detecting the voltage across the controlled load 21. It can be detected through direct detection, indirect detection, or a combination of direct and indirect acquisition methods. Specifically, the voltage signal of the controlled load 21 can be obtained through direct detection methods such as a voltage-dividing resistor circuit and a differential amplifier, or through indirect detection methods such as obtaining current and impedance for calculation.

[0031] In some embodiments, the microcontroller module 10 can take the current detection signal and the voltage signal as inputs, calculate and obtain information such as the impedance and power of the controlled load 21. Subsequently, the microcontroller module 10 can modulate the PWM control signal according to the working requirements of the controlled load 21 and send the PWM control signal to the MOS switch chip 22. The MOS switch chip 22 can be connected to the power supply through the power supply pin of the MOS switch chip 22. The MOS switch chip 22 can be turned off or on according to the PWM control signal to control the current path between the power supply and the controlled load 21, thereby performing power control on the controlled load 21.

[0032] In some embodiments, the controlled module 20 can include a signal conversion circuit 23. The signal conversion circuit 23 is configured to process the current detection signal and the voltage signal, generate a processed signal, and send the processed signal to the microcontroller module 10. The microcontroller module 10 generates a PWM control signal according to the processed signal.

[0033] Among them, the form of the processed signal can be a signal form that the microcontroller module 10 can receive, thereby facilitating the signal transmission between the controlled module 20 and the microcontroller module 10.

[0034] In some embodiments, the first input terminal of the signal conversion circuit 23 can be connected to the current output pin. The second input terminal of the signal conversion circuit 23 is connected to both the input pin of the MOS switch chip 22 and one end of the controlled load 21. The output terminal of the signal conversion circuit 23 can be connected to the input terminal of the microcontroller module 10. Specifically, the first input terminal of the signal conversion circuit 23 can be used to receive the current detection signal, the second input terminal of the signal conversion circuit 23 can be used to receive the voltage signal, and the output terminal of the signal conversion circuit 23 can be used to output the processed signal to the microcontroller module 10.

[0035] In some embodiments, the microcontroller module 10 can include an ADC sampling unit 11 and a data processing unit 12. The ADC sampling unit 11 can be used to collect the processed signal, obtain an analog-to-digital conversion signal, and send the analog-to-digital conversion signal to the data processing unit 12. The data processing unit 12 can restore the analog-to-digital conversion signal to obtain a restored signal. The restored signal can represent the current signal and the voltage signal of the controlled load 21.

[0036] In some embodiments, the ADC sampling unit 11 can perform processing such as denoising, signal amplification, and analog-to-digital conversion on the processed signal to obtain an analog-to-digital conversion signal, and the data processing unit 12 can perform reconstruction filtering on the analog-to-digital conversion signal to obtain a restored signal.

[0037] In some embodiments, the microcontroller module 10 can include a feedback algorithm unit 13. The feedback algorithm unit 13 can be connected to the data processing unit 12. The feedback algorithm unit 13 can calculate the real-time impedance and real-time power of the controlled load 21 based on the restored signal. Further, the feedback algorithm unit 13 can adjust the power reference value of the controlled load 21 according to requirements. The feedback algorithm unit 13 can perform calculations through control algorithms such as the PI (Proportional-Integral) algorithm and the PID (Proportional-Integral-Derivative) algorithm. Specifically, the proportional P can refer to the output being proportional to the current error (i.e., the difference between the set value and the actual value), the integral I can refer to the output being proportional to the cumulative sum of past errors, and the derivative D can refer to the output being proportional to the rate of change of the error (i.e., the derivative of the error). Thus, the error can be reduced to meet the requirements for accuracy and efficiency in the working process.

[0038] In some embodiments, the microcontroller module 10 can include a PWM control output unit 14. The PWM control output unit 14 can be connected to the feedback algorithm unit 13. The PWM control output unit 14 can generate a PWM control signal based on the real-time impedance and real-time power. The PWM control signal can have a preset frequency and a preset duty cycle, where the preset frequency and the preset duty cycle can be obtained based on the real-time impedance and real-time power calculated by the feedback algorithm unit 13.

[0039] In some embodiments, the PWM control output unit 14 can generate a plurality of PWM control signals for maintaining a preset constant power or a preset constant temperature of the controlled load 21 according to the change situation of the real-time impedance and the change situation of the real-time power.

[0040] In some embodiments, if the controlled load 21 is a heating wire, the PWM control output unit 14 can output a plurality of PWM control signals in sequence to control the change of the power of the heating wire, so as to maintain the preset constant temperature of the heating wire. Specifically, the PWM control output unit 14 can fit the real-time impedance of the heating wire to the temperature-resistance characteristic curve of the heating wire, and control the characteristics of the PWM control signal based on this curve to maintain a constant impedance of the heating wire. Therefore, the load power control circuit 1 of the present application can be applied not only to the scenario design that needs to maintain the constant power of the controlled load 21, but also to the scenario design that needs to maintain the constant temperature of the controlled load 21.

[0041] In some embodiments, as Figure 2 shown, the load power control circuit 1 may include a plurality of controlled modules 20. The microcontroller module 10 sends PWM control signals to each controlled module 20 to control the power of the controlled load 21 in each controlled module 20. Specifically, one microcontroller module 10 may correspond to a plurality of controlled modules 20, and may send PWM control signals correspondingly according to the real-time impedance and real-time power of the controlled load 21 of each controlled module 20. Thereby, the power of a plurality of controlled loads 21 can be controlled in real time.

[0042] In some embodiments, each controlled module 20 may be independent of each other. Each controlled module 20 can send its own current detection signal and voltage signal, or processing signal. The microcontroller module 10 can process the current detection signal and voltage signal, or processing signal of each controlled module 20, and then send the same number of PWM control signals as the number of controlled modules 20 to control the power of the controlled load 21 of each controlled module 20.

[0043] In some other embodiments, some of the plurality of controlled modules 20 may also be independent, and the remaining plurality of controlled modules 20 may receive the same or the same group of PWM control signals as a controlled system group.

[0044] In some embodiments, the MOS switch chip 22 integrates an NMOS transistor. The gate of the NMOS transistor receives the PWM control signal through the control pin. The drain of the NMOS transistor is connected to the power supply through the power supply pin of the MOS switch chip 22. The source of the NMOS transistor is connected to one end of the controlled load 21 through the input pin. In some other embodiments, the MOS switch chip 22 may not integrate an NMOS transistor. In this case, the MOS switch chip 22 can be considered equivalent to the NMOS transistor.

[0045] In some embodiments, as Figure 3As shown in the figure, the load power control circuit 1 may include a resistor R1, a resistor R2, and a resistor R3. One end of the resistor R1 may be connected to the current output pin and one input terminal of the microcontroller module 10. One end of the resistor R2 and one end of the resistor R3 are connected to another input terminal of the microcontroller module 10. The other ends of the resistor R1 and the resistor R3 are both grounded. The other end of the resistor R2 is connected to one end of the controlled load 21 and the input pin. At this time, the microcontroller module 10 can directly receive the current detection signal collected by the MOS switch chip 22 and simultaneously receive the voltage signal of the controlled load 21.

[0046] This application also relates to a load power control device (not shown in the figure), and the load power control device may include the load power control circuit 1 described above.

[0047] In this application, a MOS switch chip 22 with a current detection function is used to obtain a high-precision current detection signal of the controlled load 21. The microcontroller module 10 outputs a PWM control signal according to the current detection signal and the voltage signal to perform power control on the controlled load 21 in real time. In this case, this application can achieve high-precision current acquisition and voltage signal acquisition methods in different voltage domains, input the current detection signal and the voltage signal into the microcontroller module 10, and precisely control the power of the controlled load 21 through the control of a high-speed PWM control signal. This application uses a chip with a load current detection function to achieve high-precision load power control, including constant power / specified power curve, constant temperature / variable temperature, stepless power control, etc.; at the same time, the load power control circuit 1 of this application can be compatible with most load working environment control conditions without introducing additional current or voltage detection circuits, greatly reducing the circuit complexity of system peripherals, and having the characteristics of high precision, simplicity, and high reliability.

[0048] The above are only the preferred embodiments of this application. Those skilled in the art know that without departing from the spirit and scope of this application, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of this application, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this application. Therefore, this application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of this application.

Claims

1. A load power control circuit, characterized in that: including a microcontroller module and one or more controlled modules; The controlled module includes a controlled load and a MOS switch chip for current detection, the current output pin of the MOS switch chip and one end of the controlled load are connected to the input end of the microcontroller module, the control pin of the MOS switch chip is connected to the output end of the microcontroller module, the other end of the controlled load is grounded, and the current output pin outputs a current detection signal collected by the MOS switch chip, and the current detection signal represents the current signal of the controlled load; The microcontroller module generates and sends a PWM control signal to the MOS switch chip according to the current detection signal collected by the MOS switch chip and the voltage signal at one end of the controlled load; the MOS switch chip performs power control on the controlled load according to the PWM control signal.

2. The load power control circuit according to claim 1, characterized in that: The controlled module includes a signal conversion circuit, which is configured to process the current detection signal and the voltage signal, generate a processing signal and send the processing signal to the microcontroller module, and the microcontroller module generates the PWM control signal according to the processing signal.

3. The load power control circuit according to claim 2, characterized in that: The first input end of the signal conversion circuit is connected to the current output pin, the second input end of the signal conversion circuit is connected to the input pin of the MOS switch chip and one end of the controlled load, and the output end of the signal conversion circuit is connected to the input end of the microcontroller module.

4. The load power control circuit according to claim 2, characterized in that: The microcontroller module includes an ADC sampling unit and a data processing unit. The ADC sampling unit is used to collect the processing signal to obtain an analog-to-digital conversion signal and send the analog-to-digital conversion signal to the data processing unit. The data processing unit restores the analog-to-digital conversion signal to obtain a restored signal, and the restored signal represents the current signal and voltage signal of the controlled load.

5. The load power control circuit according to claim 4, characterized in that: The microcontroller module includes a feedback algorithm unit, which is connected to the data processing unit. The feedback algorithm unit calculates the real-time impedance and real-time power of the controlled load according to the restored signal.

6. The load power control circuit according to claim 5, characterized in that: The microcontroller module includes a PWM control output unit, which is connected to the feedback algorithm unit. The PWM control output unit generates the PWM control signal according to the real-time impedance and the real-time power.

7. The load power control circuit according to claim 6, characterized in that: The PWM control output unit generates a plurality of PWM control signals for maintaining a preset constant power or a preset constant temperature of the controlled load according to the change of the real-time impedance and the change of the real-time power.

8. The load power control circuit according to claim 1, characterized in that: The MOS switch chip is integrated with an NMOS tube, the gate of the NMOS tube receives the PWM control signal through the control pin, the drain of the NMOS tube is connected to the power supply through the power pin of the MOS switch chip, and the source of the NMOS tube is connected to one end of the controlled load through the input pin.

9. The load power control circuit according to claim 8, characterized in that: The load power control circuit includes a resistor R1, a resistor R2 and a resistor R3; one end of the resistor R1 is connected to the current output pin and an input end of the microcontroller module, one end of the resistor R2 and one end of the resistor R3 are connected to another input end of the microcontroller module, the other end of the resistor R1 and the other end of the resistor R3 are both grounded, and the other end of the resistor R2 is connected to one end of the controlled load and the input pin.

10. A load power control device, characterized in that: The load power control device comprises a load power control circuit as described in any one of claims 1 to 9.

Images