Power monitoring system and method for chip-driven peripheral circuit

Abstract

The invention provides a power monitoring system for a peripheral circuit driven by a chip. The power monitoring system is connected between a control chip and a power circuit. The power monitoring system comprises a driving signal monitoring module, a filtering module and a power detection module. When the driving signal monitoring module monitors the rising edge of the driving signal output by the driving signal output end of the control chip, the driving signal monitoring module sends a starting signal to the filtering module. The filtering module is used for filtering the output power detection signal of the power detection module under the control of the starting signal, so that the output power detection signal output to the power monitoring input end of the control chip is kept unchanged; and the filtering module closes filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip. The filtering module is started through the driving signal monitoring module when the power changes, noise interference caused by sudden change of the power is filtered out, and the detection stability is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of chip technology, and more particularly to a power monitoring method and system for a peripheral circuit driven by a chip. Background Art

[0002] Usually in the architecture of chip-driven peripheral power circuits, the chip needs to detect whether the power of the peripheral circuit exceeds the allowed range. If it exceeds the limit, the output power needs to be reduced or emergency shutdown protection needs to be performed. Usually, the chip collects the voltage and current signals of the peripheral circuit in real time, calculates the actual power and compares it with the preset threshold. If an over-limit is detected, the protection mechanism (such as cutting off the output or reducing the frequency) is immediately triggered to ensure the safe operation of the system. However, at the moment of sudden change in the voltage / current of the power drive circuit, the system often generates a lot of noise. At this time, the detection circuit is likely to be interfered by the noise, resulting in misjudgment (in fact, the output power does not exceed the limit range).

[0003] Based on this, a new solution is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a power monitoring system and method for a peripheral circuit driven by a chip to address the shortcomings of existing detection circuits that have noise at the moment of voltage / current mutation, which is prone to misjudgment.

[0005] According to one aspect of the present invention, a power monitoring system for a peripheral circuit driven by a chip is provided, which is connected between a control chip and a power circuit, and includes: A driving signal monitoring module, wherein an input end of the driving signal monitoring module is connected to a driving signal output end of the control chip; A power detection module, wherein an input end of the power detection module is connected to an output end of the power circuit; A filter module, wherein the input end of the filter module is connected to the output end of the drive signal monitoring module and the output end of the power detection module, and the output end of the filter module is connected to the power monitoring input end of the control chip; Among them, when the driving signal monitoring module detects the rising edge of the driving signal output from the driving signal output end of the control chip, the start signal is sent to the filtering module, and the filtering module filters the output power detection signal of the power detection module under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip remains unchanged. After the output power detection signal of the power detection module is stable, the filtering module turns off the filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

[0006] In the power monitoring system for the peripheral circuit of chip driving provided by the present invention, the filtering module includes: A storage unit, wherein an input end of the storage unit is connected to an output end of the power detection module; A control unit, wherein an input end of the control unit is connected to an output end of the drive signal monitoring module and an output end of the power detection module, and an output end of the control unit is connected to an input end of the storage unit; A filter unit, wherein an input end of the filter unit is connected to an output end of the storage unit, an output end of the control unit and an output end of the power detection module, and an output end of the filter unit is connected to a power monitoring input end of the control chip; Among them, the control unit sends a start filtering signal to the filtering unit and the storage unit when receiving the start filtering signal, and the filtering unit outputs the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input end of the control chip when receiving the start filtering signal, and the storage unit stops storing the output power detection signal of the power detection module when receiving the start filtering signal; after the output power is stable, the control unit outputs a stop filtering signal to the filtering unit and the storage unit, and the filtering unit outputs the output power detection signal of the power detection module to the power monitoring input end of the control chip when receiving the stop filtering signal, and the storage unit starts storing the output power detection signal of the power detection module when receiving the stop filtering signal.

[0007] In the power monitoring system for chip-driven peripheral circuits provided by the present invention, the control unit is a first counter, which starts counting when receiving the start signal, sends a start filtering signal to the filtering unit and the storage unit, and outputs a stop filtering signal to the filtering unit and the storage unit after reaching a pre-designed value.

[0008] In the power monitoring system for chip-driven peripheral circuits provided by the present invention, the control unit includes a power detection unit and a comparison unit. When receiving the start signal, the input end of the power detection unit sends a start filtering signal to the filtering unit and the storage unit and starts to detect the high level width and the low level width of the output power detection signal of the power detection module. When the difference between the high level width and the low level width is greater than a preset value, the comparison unit outputs a stop filtering signal to the filtering unit and the storage unit.

[0009] According to another aspect of the present invention, there is also provided a power monitoring method for a peripheral circuit driven by a chip, comprising: Step S1, when a rising edge of a driving signal outputted from a driving signal output terminal of a control chip is detected, a start signal is sent to a filtering module; Step S2, the filtering module filters the output power detection signal of the power detection module under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip remains unchanged; after the output power detection signal of the power detection module stabilizes, the filtering module turns off filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

[0010] In the power monitoring method for the peripheral circuit of chip driving provided by the present invention, the filtering module includes a storage unit, a control unit and a filtering unit, and the step S2 includes: Step S21, the control unit sends a start filtering signal to the filtering unit and the storage unit when receiving the start signal; Step S22, when the filtering unit receives the start filtering signal, the filtering unit outputs the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input terminal of the control chip, and when the storage unit receives the start filtering signal, the storage unit stops storing the output power detection signal of the power detection module; Step S23, after the output power is stabilized, the control unit outputs a stop filtering signal to the filtering unit and the storage unit. When the filtering unit receives the stop filtering signal, it outputs the output power detection signal of the power detection module to the power monitoring input end of the control chip. When the storage unit receives the stop filtering signal, it starts to store the output power detection signal of the power detection module.

[0011] In the power monitoring method for chip-driven peripheral circuits provided by the present invention, in step S23, after reaching a preset time, the control unit outputs a stop filtering signal to the filtering unit and the storage unit.

[0012] In the power monitoring method for chip-driven peripheral circuits provided by the present invention, in step S23, when the difference between the high-level width and the low-level width of the output power detection signal of the power detection module is greater than a preset value, a stop filtering signal is output to the filtering unit and the storage unit.

[0013] The power monitoring method and system for chip-driven peripheral circuits of the present invention have the following beneficial effects: the present invention monitors the driving signal of the control chip through a driving signal monitoring module, turns on the filtering module when the driving signal outputs a rising edge, filters the output power detection signal of the power detection module, and filters out unstable output caused by noise; after a certain period of time, the noise is eliminated, and the function is automatically restored to continue power monitoring; the driving signal monitoring module starts the filtering module when the power changes, filters out the noise interference caused by the power mutation, and enhances the stability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work: Figure 1 The figure shows a schematic diagram of a power monitoring system for a peripheral circuit driven by a chip proposed by the present invention; Figure 2 Shown Figure 1 The schematic diagram of the filtering module shown; Figure 3 The figure shows a flow chart of a power monitoring method for a peripheral circuit driven by a chip proposed by the present invention. DETAILED DESCRIPTION

[0015] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Typical embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0017] Figure 1 FIG. 1 is a schematic diagram of a power monitoring system for a peripheral circuit of a chip driver proposed by the present invention. Figure 1As shown, the power monitoring system for chip-driven peripheral circuits provided by the present invention is connected between the control chip 100 and the power circuit 200, and includes a drive signal monitoring module 300, a filter module 400 and a power detection module 500. Among them, the input end of the drive signal monitoring module 300 is connected to the drive signal output end of the control chip 100; the input end of the power detection module 500 is connected to the output end of the power circuit 200; the input end of the filter module 400 is connected to the output end of the drive signal monitoring module 300 and the output end of the power detection module 500, and the output end of the filter module 400 is connected to the power monitoring input end of the control chip 100. The control chip 100 drives the power circuit 200 by outputting a PWM waveform, and the power detection module 500 is used to detect the change of the output power of the power circuit 200, and generate an output power detection signal to indicate whether the output power of the power circuit 200 is stable or not. Therefore, when the drive signal monitoring module 300 detects the rising edge of the drive signal output from the drive signal output end of the control chip 100, a start signal is sent to the filter module 400; the filter module 400 filters the output power detection signal of the power detection module 500 under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip 100 remains unchanged; after the output power detection signal of the power detection module stabilizes, the filter module turns off filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

[0018] The control chip uses PWM waveform output to drive the power circuit. Usually, at the rising edge of PWM, the conduction current of the driving MOS tube is very large, which causes the power circuit to generate a lot of noise, affecting the stability of the power detection circuit and possibly causing misjudgment. The present invention monitors the drive signal of the control chip through a drive signal monitoring module, turns on the filter module at the rising edge of the PWM output, filters the output power detection signal of the power detection module, and filters out the unstable output caused by the noise; after a certain period of time, the noise is eliminated, and the function is automatically restored to continue power monitoring. The filter module is started by the drive signal monitoring module when the power changes, and the noise interference caused by the sudden change of power is filtered out, thereby enhancing the stability of the detection.

[0019] Figure 2 Shown Figure 1 The schematic diagram of the filter module is shown in Figure 1. Figure 2As shown, the filtering module includes a storage unit 410, a control unit 420 and a filtering unit 430. The input end of the storage unit 410 is connected to the output end of the power circuit 200 and the output end of the control unit 420; the input end of the control unit 420 is connected to the output end of the drive signal monitoring module 300 and the output end of the power detection module 500; the input end of the filtering unit 430 is connected to the output end of the storage unit 410, the output end of the control unit 420 and the output end of the power circuit 420, and the output end of the filtering unit 430 is connected to the power monitoring input end of the control chip 100. Specifically, when the control unit 420 receives the start signal from the drive signal monitoring module, it sends a start filtering signal to the filtering unit 430 and the storage unit 410, and after the output power detection signal is stable, it outputs a stop filtering signal to the filtering unit 430 and the storage unit 410. The storage unit 410 is used to stop storing the output power detection signal of the power detection module when receiving the start filtering signal; and start storing the output power detection signal of the power detection module when receiving the stop filtering signal, that is, storing the output power detection signal of the power detection module within a certain time during the non-filtering period. The filtering unit 430 is used to output the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input terminal of the control chip when receiving the start filtering signal; and output the output power detection signal of the power detection module to the power monitoring input terminal of the control chip when receiving the stop filtering signal.

[0020] In the present embodiment, when filtering is turned on, the storage unit 410 stops storing new output power detection signals, but transmits the stored historical output power detection signals to the control chip 100 through the filtering unit, so that the filtered stable signal can be used. When filtering stops, the system returns to a normal working state, and directly transmits the output power detection signal of the power detection module to the control chip. Thus, the control unit can filter when the output power detection signal of the power detection module fluctuates, ensuring that the output power detection signal transmitted to the control chip is stable. Through the filtering module, a stable output power detection signal can be output when the power is unstable, avoiding directly outputting the unstable output power detection signal to the control chip, and ensuring the reliability and stability of the system.

[0021] Further, in an embodiment of the present invention, the control unit is a first counter. The first counter starts counting when receiving the start signal, sends a start filtering signal to the filtering unit and the storage unit, and outputs a stop filtering signal to the filtering unit and the storage unit after reaching a preset value. In this embodiment, the counter is used to realize the operation of automatically starting and stopping filtering under specific conditions. By presetting a value or time, the filtering operation can be ensured to be carried out within a specific time period; at the same time, the user is allowed to adjust the preset value or time according to needs, so as to flexibly adjust the start and end times of the filtering and storage operations.

[0022] In this embodiment, a counter is used to control the start and stop of multiple units (filtering unit and storage unit), which simplifies the control logic of the system. This not only reduces the complexity of the hardware, but also reduces the difficulty of system maintenance. Further, the counter detects the widths of the high and low levels. Assume that the detected high-level width is W_high and the low-level width is W_low; if the absolute value of the difference between the two |W_high - W_low| is relatively small, it indicates that the output power detection signal is unstable and changing frequently; on the contrary, if the difference is large, it indicates that the signal is stable and unchanged; therefore, a threshold W_th can be set: when |W_high - W_low| >= W_th, the window is closed; when |W_high - W_low| < W_th, the window filtering function continues to work. Therefore, by detecting the widths of the high level (W_high) and low level (W_low) of the output power detection signal through the power magnitude detection unit, the system can evaluate the stability of the output power detection signal. Therefore, in another embodiment of the present invention, the control unit includes a power magnitude detection unit and a comparison unit. The input end of the power magnitude detection unit sends a start filtering signal to the filtering unit and the storage unit and starts detecting the widths of the high level and low level of the output power detection signal of the power detection module when receiving the start signal. The comparison unit outputs a stop filtering signal to the filtering unit and the storage unit when the difference between the width of the high level and the width of the low level is greater than a preset value.

[0023] In this embodiment, by analyzing the periodic changes of the output power detection signal, it helps to judge whether the output power detection signal is in a stable state, so as to decide whether it is necessary to stop the output of the filtering signal. Based on the stability judgment of the output power detection signal, the comparison unit will control the working state of the filtering and storage unit according to the set threshold value (W_th): when the difference |W_high - W_low| is greater than or equal to the preset threshold value W_th, it means that the output power detection signal is relatively stable, and the system closes the filtering window by outputting a stop filtering signal, thereby avoiding excessive storage or unnecessary signal processing; when the difference |W_high - W_low| is less than the preset threshold value W_th, it means that the output power detection signal is unstable or changes frequently. At this time, the filtering function is kept working continuously to ensure that the system can process unstable signals. This dynamic control method can adjust the response of the system according to the real-time changes of the output power detection signal, thereby improving the adaptability and accuracy of the system. By comparing the difference between the high level and the low level width to judge the signal stability, the need for complex algorithms is reduced. In terms of hardware implementation, the control unit can complete all functions through simple counters and comparison units, reducing the complexity of system design and improving overall stability and reliability.

[0024] Furthermore, by setting the dynamically adjusted threshold W_th, the sensitivity of the signal stability judgment can be adjusted according to actual needs, thereby changing the start and stop timing of the filter window. For example, in some specific scenarios, users can choose a smaller W_th threshold to make the system more sensitive to signal fluctuations, thereby stopping the filtering process in advance and avoiding unnecessary storage. On the contrary, in an environment with lower requirements for signal stability, a larger W_th value is selected so that the system can continue filtering operations for a longer period of time.

[0025] Figure 3 FIG. 1 is a flow chart of a power monitoring method for a peripheral circuit of a chip driver proposed by the present invention. Figure 3 As shown, the power monitoring method for the peripheral circuit of chip driving provided by the present invention includes: Step S1, when a rising edge of a driving signal outputted from a driving signal output terminal of a control chip is detected, a start signal is sent to a filtering module; Step S2, the filtering module filters the output power detection signal of the power detection module under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip remains unchanged; after the output power detection signal of the power detection module stabilizes, the filtering module turns off filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

[0026] Further, in an embodiment of the present invention, the filtering module includes a storage unit, a control unit and a filtering unit, and the step S2 includes: Step S21, the control unit sends a start filtering signal to the filtering unit and the storage unit when receiving the start signal; Step S22, when the filtering unit receives the start filtering signal, the filtering unit outputs the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input terminal of the control chip, and when the storage unit receives the start filtering signal, the storage unit stops storing the output power detection signal of the power detection module; Step S23, after the output power is stabilized, the control unit outputs a stop filtering signal to the filtering unit and the storage unit. When the filtering unit receives the stop filtering signal, it outputs the output power detection signal of the power detection module to the power monitoring input end of the control chip. When the storage unit receives the stop filtering signal, it starts to store the output power detection signal of the power detection module.

[0027] Further, in an embodiment of the present invention, in the step S23, after a preset time is reached, the control unit outputs a stop filtering signal to the filtering unit and the storage unit.

[0028] Furthermore, in one embodiment of the present invention, in the step S23, when the difference between the high level width and the low level width of the output power detection signal of the power detection module is greater than a preset value, a stop filtering signal is output to the filtering unit and the storage unit.

[0029] In each of the descriptions provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0030] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0031] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0032] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A power monitoring system for a peripheral circuit driven by a chip, connected between a control chip and a power circuit, characterized in that: include: A driving signal monitoring module, wherein an input end of the driving signal monitoring module is connected to a driving signal output end of the control chip; A power detection module, wherein an input end of the power detection module is connected to an output end of the power circuit; A filter module, wherein the input end of the filter module is connected to the output end of the drive signal monitoring module and the output end of the power detection module, and the output end of the filter module is connected to the power monitoring input end of the control chip; Among them, when the driving signal monitoring module detects the rising edge of the driving signal output from the driving signal output end of the control chip, the start signal is sent to the filtering module, and the filtering module filters the output power detection signal of the power detection module under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip remains unchanged. After the output power detection signal of the power detection module is stable, the filtering module turns off the filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

2. The power monitoring system for chip-driven peripheral circuits according to claim 1, characterized in that: The filtering module comprises: A storage unit, wherein an input end of the storage unit is connected to an output end of the power detection module; A control unit, wherein an input end of the control unit is connected to an output end of the drive signal monitoring module and an output end of the power detection module, and an output end of the control unit is connected to an input end of the storage unit; A filter unit, wherein an input end of the filter unit is connected to an output end of the storage unit, an output end of the control unit and an output end of the power detection module, and an output end of the filter unit is connected to a power monitoring input end of the control chip; Among them, the control unit sends a start filtering signal to the filtering unit and the storage unit when receiving the start filtering signal, and the filtering unit outputs the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input end of the control chip when receiving the start filtering signal, and the storage unit stops storing the output power detection signal of the power detection module when receiving the start filtering signal; after the output power is stable, the control unit outputs a stop filtering signal to the filtering unit and the storage unit, and the filtering unit outputs the output power detection signal of the power detection module to the power monitoring input end of the control chip when receiving the stop filtering signal, and the storage unit starts storing the output power detection signal of the power detection module when receiving the stop filtering signal.

3. The power monitoring system for chip-driven peripheral circuits according to claim 2, characterized in that: The control unit is a first counter, which starts counting upon receiving the start signal, sends a start filtering signal to the filtering unit and the storage unit, and outputs a stop filtering signal to the filtering unit and the storage unit after reaching a pre-designed value.

4. The power monitoring system for chip-driven peripheral circuits according to claim 2, characterized in that: The control unit includes a power detection unit and a comparison unit. When receiving the start signal, the input end of the power detection unit sends a start filtering signal to the filtering unit and the storage unit and starts to detect the high level width and the low level width of the output power detection signal of the power detection module. When the difference between the high level width and the low level width is greater than a preset value, the comparison unit outputs a stop filtering signal to the filtering unit and the storage unit.

5. A power monitoring method for a peripheral circuit driven by a chip, characterized in that: The following steps are involved: Step S1, when a rising edge of a driving signal outputted from a driving signal output terminal of a control chip is detected, a start signal is sent to a filtering module; Step S2, the filtering module filters the output power detection signal of the power detection module under the control of the start signal so that the output power detection signal output to the power monitoring input end of the control chip remains unchanged; after the output power detection signal of the power detection module stabilizes, the filtering module turns off filtering so that the output power detection signal of the power detection module is directly output to the power monitoring input end of the control chip.

6. The power monitoring method for a peripheral circuit of a chip driver according to claim 5, characterized in that: The filtering module includes a storage unit, a control unit and a filtering unit, and the step S2 includes: Step S21, the control unit sends a start filtering signal to the filtering unit and the storage unit when receiving the start signal; Step S22, when the filtering unit receives the start filtering signal, the filtering unit outputs the output power detection signal of the power detection module at the previous moment stored in the storage unit to the power monitoring input terminal of the control chip, and when the storage unit receives the start filtering signal, the storage unit stops storing the output power detection signal of the power detection module; Step S23, after the output power is stabilized, the control unit outputs a stop filtering signal to the filtering unit and the storage unit. When the filtering unit receives the stop filtering signal, it outputs the output power detection signal of the power detection module to the power monitoring input end of the control chip. When the storage unit receives the stop filtering signal, it starts to store the output power detection signal of the power detection module.

7. The power monitoring method for a peripheral circuit of a chip driver according to claim 6, characterized in that: In the step S23, after the preset time is reached, the control unit outputs a stop filtering signal to the filtering unit and the storage unit.

8. The power monitoring method for a peripheral circuit of a chip driver according to claim 6, characterized in that: In the step S23, when the difference between the high level width and the low level width of the output power detection signal of the power detection module is greater than a preset value, a stop filtering signal is output to the filtering unit and the storage unit.

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