Variable pulse output circuit based on power frequency, constant-power power frequency circuit and equipment

Abstract

The embodiment of the invention provides a variable pulse output circuit based on power frequency, a constant-power power frequency circuit and equipment, and belongs to the technical field of electronic circuits. The circuit comprises a rectifier module, a partial pressure sampling module, a square wave signal acquisition module, a triangular wave signal acquisition module, a peak signal acquisition module and a comparison module; a pulse signal with double power frequency and capable of automatically adjusting pulse width or duty ratio according to power frequency voltage is generated by using an analog circuit instead of depending on an inductive or capacitive element. When the power frequency voltage fluctuates within a certain range, the pulse width or the duty ratio of the output pulse signal is automatically adjusted according to the power frequency voltage, and it is ensured that the load works at a stable power level. The circuit has a self-adaptive capability, and can maintain constant power output of the load under the condition that the power frequency voltage changes, so that the load can still operate normally under an unstable power supply condition, the influence of power fluctuation on equipment performance is avoided, and the equipment stability and the working efficiency are improved.

Description

Technical Field

[0001] This invention relates to electronic circuits, and more particularly to a variable pulse output circuit based on power frequency, a constant power frequency circuit, and a device. Background Technology

[0002] Power frequency refers to the 50 Hz or 60 Hz power supply frequency commonly used in power systems, and it forms the basis for various power generation, transmission, transformation, and distribution equipment. Power frequency circuits belong to the low-frequency circuit category, and their low operating frequency is a prominent characteristic. Compared to high-frequency circuits, power frequency circuits have weaker electromagnetic radiation, less interference, and relatively less noise. Due to their low frequency, power frequency circuits offer stable and reliable signal transmission. In industrial, civil, aerospace, and energy fields, power frequency circuits are widely used in various electrical and electronic devices, such as motors, lighting fixtures, power supplies, chargers, UPS systems, air conditioners, and televisions.

[0003] However, in a power grid environment, voltage fluctuations are a common problem affecting the normal operation of equipment. The voltage in the power grid is not always constant; fluctuations can occur due to load changes, excessive transmission distances, equipment aging, or other factors. For many electrical devices, especially those requiring stable power output, such as motors, UPS systems, and industrial control equipment, voltage fluctuations can lead to unstable equipment performance and even damage to critical components. Voltage changes directly affect the operating state of the equipment, potentially causing unstable output power. This fluctuation not only affects the normal operation of the equipment but can also lead to decreased energy efficiency and increased maintenance and replacement costs. In applications requiring high precision and stability, such as industrial automation, aerospace, and critical power equipment, maintaining stable power output is crucial. Therefore, ensuring that power frequency circuits can still achieve constant power output under voltage fluctuations is particularly important. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a variable pulse output circuit based on power frequency, a constant power frequency circuit and device, to solve the problem of power instability in the voltage waveform of the power frequency circuit in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a variable pulse output circuit based on power frequency. The circuit includes: a rectifier module, a voltage divider sampling module, a square wave signal acquisition module, a triangular wave signal acquisition module, a peak signal acquisition module, and a comparator module. The output terminal of the rectifier module is electrically connected to the input terminal of the voltage divider sampling module. The output terminal of the voltage divider sampling module is electrically connected to the input terminals of the square wave acquisition module and the peak signal acquisition module, respectively. The output terminal of the square wave acquisition module is electrically connected to the input terminal of the triangular wave signal acquisition module. The output terminals of the triangular wave signal acquisition module and the peak signal acquisition module are respectively... The system is electrically connected to the input of the comparison module. The power frequency AC signal is rectified by the rectifier module and output as a frequency-doubled DC signal. The frequency-doubled DC signal is then divided by the voltage divider sampling module and output as a voltage-divided DC signal. The voltage-divided DC signal is then divided by the square wave signal acquisition module and output as a square wave signal. The square wave signal is then divided by the triangular wave acquisition module and output as a triangular wave signal. The voltage-divided DC signal is then divided by the peak signal acquisition module and output as a voltage peak signal. The triangular wave signal and the voltage peak signal are then compared by the comparison module and output as a duty cycle adjustable pulse signal. The duty cycle of the duty cycle adjustable pulse signal is inversely proportional to the voltage of the power frequency AC signal.

[0006] Preferably, the rectifier module includes a full-bridge rectifier composed of a first diode, a second diode, a fifth diode, and a sixth diode. The AC input terminal of the full-bridge rectifier is connected to the power frequency AC signal, the positive DC output terminal is electrically connected to the voltage divider sampling module, and the negative DC output terminal is grounded.

[0007] Preferably, the voltage divider sampling module includes a second resistor and a fourth resistor connected in series. The series node of the second resistor and the fourth resistor is electrically connected to the square wave signal acquisition module and the peak signal acquisition module, respectively. The frequency-doubled DC signal is output as the voltage-divided DC signal at the series node after passing through the voltage divider sampling module.

[0008] Preferably, the square wave acquisition module includes a first operational amplifier unit and a second operational amplifier unit, wherein the first operational amplifier unit includes a first operational amplifier, a first resistor, a half-bridge rectifier composed of a third diode and a fourth diode, and a second capacitor. The positive input terminal of the first operational amplifier is electrically connected to the voltage divider sampling module, the first resistor is electrically connected between the output terminal and the negative input terminal of the first operational amplifier, the second capacitor is electrically connected between the half-bridge rectifier and ground, and the output terminal of the first operational amplifier is electrically connected to the second operational unit via the half-bridge rectifier.

[0009] Preferably, the second operational amplifier unit includes a second operational amplifier, wherein the positive input terminal of the second operational amplifier is electrically connected to the first operational amplifier unit, the negative input terminal is electrically connected to the voltage divider sampling module, and the output terminal of the second operational amplifier is electrically connected to the triangular wave acquisition module.

[0010] Preferably, the triangular wave acquisition module includes a third operational amplifier, a third resistor, a sixth resistor, a fifth resistor, and a first capacitor. The negative input terminal of the third operational amplifier is electrically connected to the output terminal of the square wave acquisition module via the fifth resistor. The third resistor and the sixth resistor are connected in series between a 5V voltage and ground. The positive input terminal of the third operational amplifier is electrically connected to the series node of the third resistor and the sixth resistor. The first capacitor is electrically connected between the negative input terminal and the output terminal of the third operational amplifier. The output terminal of the third operational amplifier is electrically connected to the comparison module.

[0011] Preferably, the peak signal acquisition module includes a seventh diode, a seventh resistor, and a third capacitor, wherein the positive terminal of the seventh diode is electrically connected to the voltage divider sampling module, the negative terminal is electrically connected to the seventh resistor and the third capacitor connected in parallel, and is electrically connected to the comparison module.

[0012] Preferably, the comparison module includes a fourth operational amplifier, wherein the positive input terminal of the fourth operational amplifier is electrically connected to the output terminal of the triangular wave signal acquisition module, and the negative input terminal is electrically connected to the output terminal of the peak signal acquisition module.

[0013] Secondly, embodiments of the present invention provide a constant power frequency circuit, the circuit comprising a duty cycle adjustable pulse signal output circuit as described in any of the first aspects, a load, a transistor, and a bias resistor, wherein the base of the transistor is electrically connected to the output terminal of the duty cycle adjustable pulse signal output circuit, the collector is electrically connected to the negative terminal of the load, and the emitter is grounded via the bias resistor. The power frequency AC signal is input to the positive terminal of the load after DC rectification. When the voltage of the power frequency AC signal increases, the duty cycle of the duty cycle adjustable pulse signal output by the duty cycle adjustable pulse signal output circuit decreases accordingly. When the voltage of the power frequency AC signal decreases, the duty cycle of the duty cycle adjustable pulse signal output by the duty cycle adjustable pulse signal output circuit increases accordingly, thereby achieving constant load power.

[0014] Thirdly, embodiments of the present invention provide a power frequency grid device, the device including a duty cycle adjustable pulse signal output circuit as described in any of the first aspects or a constant power frequency circuit as described in the second aspect.

[0015] In summary, the beneficial effects of the present invention are as follows:

[0016] The variable pulse output circuit, constant power AC circuit, and device based on power frequency provided in this invention utilize a rectifier module to convert a power frequency AC signal into a frequency-doubled DC signal. After voltage division and sampling, the divided DC signal enters a square wave signal acquisition module and a peak signal acquisition module. On one hand, the divided DC signal is converted into a stable triangular wave signal after passing through these modules. On the other hand, the peak signal acquisition module performs peak detection on the divided DC signal and acquires the voltage peak signal. The triangular wave signal and the voltage peak signal are compared by a comparison module to output a pulse signal with an adjustable duty cycle. The duty cycle of this pulse signal can be dynamically adjusted according to the voltage change of the input power frequency AC signal, forming a duty cycle adjustment mechanism inversely proportional to the voltage. This allows the circuit to automatically adjust the duty cycle of the output pulse under different input voltages. This invention's circuit generates a pulse signal at twice the power frequency using analog circuitry instead of relying on inductive or capacitive components, and can automatically adjust the pulse width or duty cycle according to the power frequency voltage. When the power frequency voltage fluctuates within a certain range, the pulse width or duty cycle of the pulse signal output by the circuit will automatically adjust according to the power frequency voltage, thereby ensuring that the load operates at a stable power level. This circuit has adaptive capability, maintaining a constant power output from the load even when the power frequency voltage changes. This allows the load to operate normally under unstable power conditions, avoiding the impact of power fluctuations on equipment performance and greatly improving equipment stability and efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0018] Figure 1 This is a schematic diagram of the variable pulse output circuit based on power frequency according to an embodiment of the present invention.

[0019] Figure 2 This is a detailed circuit diagram of the duty cycle adjustable pulse signal output circuit according to an embodiment of the present invention.

[0020] Figure 3 This is a waveform diagram of an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the constant power frequency circuit according to an embodiment of the present invention. Detailed Implementation

[0022] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The embodiments described below are merely illustrative; the division of modules or circuits is only a logical functional division, and other division methods may exist in actual implementation. In this embodiment and the accompanying drawings, elements unrelated to the present invention have been omitted and are not shown, and the dimensional relationships between the elements in the drawings are for ease of understanding only and are not intended to limit the actual scale.

[0024] Please see Figure 1This invention provides a variable pulse output circuit based on power frequency. The circuit includes: a rectifier module 1, a voltage divider sampling module 2, a square wave signal acquisition module 3, a triangular wave signal acquisition module 4, a peak signal acquisition module 5, and a comparator module 6. The output terminal of the rectifier module 1 is electrically connected to the input terminal of the voltage divider sampling module 2. The output terminal of the voltage divider sampling module 2 is electrically connected to the input terminals of the square wave acquisition module 3 and the peak signal acquisition module 5, respectively. The output terminal of the square wave acquisition module 3 is electrically connected to the input terminal of the triangular wave signal acquisition module 4. The output terminals of the triangular wave signal acquisition module 4 and the peak signal acquisition module 5 are respectively connected to the comparator module 6. The input terminal is electrically connected. The power frequency AC signal is rectified by the rectifier module 1 and output as a frequency-doubled DC signal. The frequency-doubled DC signal is then divided by the voltage divider sampling module 2 and output as a voltage-divided DC signal. On one hand, the voltage-divided DC signal is divided by the square wave signal acquisition module 3 and output as a square wave signal. The square wave signal is then divided by the triangular wave acquisition module 4 and output as a triangular wave signal. On the other hand, the voltage-divided DC signal is divided by the peak signal acquisition module 5 and output as a voltage signal. The voltage value of this voltage signal is basically maintained at a fixed value, which is called the voltage peak signal. The voltage value of the voltage peak signal is closely related to the voltage of the power frequency AC signal. When the voltage of the power frequency AC signal changes, the voltage value of the voltage peak signal changes accordingly. The triangular wave signal and the voltage peak signal are respectively input to the comparison module 6. The comparison module 6 compares the triangular wave signal and the voltage peak signal. When the voltage value of the triangular wave signal is greater than the voltage value of the voltage peak signal, it outputs a high level; when the voltage value of the triangular wave signal is less than the voltage value of the voltage peak signal, it outputs a low level. The output terminal of the comparison module 6 outputs a pulse signal. Since the voltage value of the voltage peak signal changes with the voltage value of the power frequency AC signal, when the power frequency AC signal voltage increases, the voltage value of the voltage peak signal increases, and the high-level pulse width and duty cycle of the pulse signal decrease. Conversely, when the power frequency AC signal voltage decreases, the voltage value of the voltage peak signal decreases, and the high-level pulse width and duty cycle of the pulse signal increase. Thus, a pulse signal with adjustable pulse width or adjustable duty cycle is output, denoted as a duty cycle adjustable pulse signal. The pulse width of the duty cycle adjustable pulse signal is inversely proportional to the voltage of the power frequency AC signal.

[0025] In one embodiment, see Figure 2The rectifier module 1 includes a full-bridge rectifier composed of a first diode D1, a second diode D2, a fifth diode D5, and a sixth diode D6. The AC input terminal of the full-bridge rectifier is connected to the power frequency AC signal VAC, the positive DC output terminal is electrically connected to the voltage divider sampling module 2, and the negative DC output terminal is grounded. After passing through the full-bridge rectifier, the power frequency AC signal VAC outputs a DC signal with a frequency twice that of the power frequency AC signal VAC. The rectifier module 1 converts the power frequency AC signal into a pulsating DC signal through the full-bridge rectifier, outputting a stable DC voltage. The rectified DC signal is provided to other modules in the circuit, such as the voltage divider sampling module, ensuring that subsequent processing in the circuit can operate based on a stable DC signal.

[0026] In one embodiment, see Figure 2 The voltage divider sampling module 2 includes a second resistor R2 and a fourth resistor R4 connected in series. The series connection node of the second resistor R2 and the fourth resistor R4 is electrically connected to the square wave signal acquisition module 3 and the peak signal acquisition module 5, respectively. The frequency-doubled DC signal output from the rectifier module 1 is output as the voltage-divided DC signal at the series connection node after passing through the voltage divider sampling module 2. The voltage divider sampling module is responsible for converting the frequency-doubled DC signal into a voltage-divided DC signal for generating square wave and peak signals. By dividing the voltage through the series resistors, precise voltage regulation is achieved, thereby providing a stable and suitable input signal for the square wave signal acquisition module 3 and the peak signal acquisition module 5, ensuring the accuracy and stability of the subsequent square wave, triangular wave, and voltage peak signal generation. The voltage divider sampling module divides the high-voltage frequency-doubled DC signal into a low-voltage DC signal suitable for subsequent module processing, effectively preventing overload or damage to subsequent circuit modules that may be caused by the high-voltage signal, and also ensuring the accuracy and reliability of signal processing.

[0027] In one embodiment, see Figure 2The square wave acquisition module 3 includes a first operational amplifier unit 31 and a second operational amplifier unit 32. The first operational amplifier unit 31 includes a first operational amplifier U1A, a first resistor R1, a half-bridge rectifier composed of a third diode D3 and a fourth diode D4, and a second capacitor C2. The positive input terminal of the first operational amplifier U1A is electrically connected to the output terminal of the voltage divider sampling module 2, i.e., the series node of the second resistor R2 and the fourth resistor R4. The first resistor R1 is electrically connected between the output terminal and the negative input terminal of the first operational amplifier U1A. The second capacitor C2 is electrically connected between the half-bridge rectifier and ground. The output terminal of the first operational amplifier U1A is electrically connected to the second operational amplifier unit 32 via the half-bridge rectifier. The second operational amplifier unit 32 includes a second operational amplifier U1B. The positive input terminal of the second operational amplifier U1B is electrically connected to the half-bridge rectifier in the first operational amplifier unit 21, and the negative input terminal is electrically connected to the output terminal of the voltage divider sampling module 2. The output terminal of the second operational amplifier unit 32 is electrically connected to the triangular wave acquisition module 4. The square wave acquisition module 3 rectifies and amplifies the input voltage-divided DC signal and outputs a square wave signal with consistent high and low level widths, which is then provided to the triangular wave signal acquisition module 4 to generate a stable triangular wave signal.

[0028] In one embodiment, the first operational amplifier U1A and the second operational amplifier U1B are two independent operational amplifiers in the LM358. The LM358 is a dual operational amplifier, which includes two independent, high-gain operational amplifiers. A square wave module can be implemented using one LM358 chip and several external resistors and capacitors, which helps to reduce the number of circuit components and lower circuit size and cost.

[0029] In one embodiment, see Figure 2The triangular wave acquisition module 4 includes a third operational amplifier U2A, a third resistor R3, a sixth resistor R6, a fifth resistor R5, and a first capacitor C1. The negative input terminal of the third operational amplifier U2A is electrically connected to the output terminal of the square wave acquisition module 3 via the fifth resistor R5. The third resistor R3 and the sixth resistor R6 are connected in series between the 5V voltage and ground. The positive input terminal of the third operational amplifier U2A is electrically connected to the series node of the third resistor R3 and the sixth resistor R6. The first capacitor C1 is electrically connected between the negative input terminal and the output terminal of the third operational amplifier U2A. The output terminal of the third operational amplifier U2A is electrically connected to the comparison module 6. The triangular wave acquisition module 4 integrates the square wave signal output by the square wave signal acquisition module 3 to generate a stable triangular wave signal. The voltage divider circuit composed of the series-connected third resistor R3 and the sixth resistor divides the 5V voltage and provides a reliable reference voltage for the integration process. The third operational amplifier U2A converts the square wave signal into a triangular wave signal with stable frequency and amplitude.

[0030] In one embodiment, see Figure 2 The peak signal acquisition module 5 includes a seventh diode D7, a seventh resistor R7, and a third capacitor C3. The positive terminal of the seventh diode D7 is electrically connected to the output terminal of the voltage divider sampling module 2, and the negative terminal is electrically connected to one end of the parallel-connected seventh resistor R7 and third capacitor R3. The other ends of the seventh resistor R7 and third capacitor R3 are grounded. The negative terminal of the seventh diode is also electrically connected to the comparison module 6. The voltage-divided DC signal output from the output terminal of the voltage divider sampling module 2 is then processed by a peak detector composed of the seventh diode and the third capacitor to output its peak voltage signal, thus realizing the conversion from a voltage-divided DC signal to a peak voltage signal.

[0031] In one embodiment, see Figure 2 The comparison module 6 includes a fourth operational amplifier U2B, wherein the positive input terminal of the fourth operational amplifier U2B is electrically connected to the output terminal of the triangular wave signal acquisition module 4, and the negative input terminal is electrically connected to the output terminal of the peak signal acquisition module 5.

[0032] In one embodiment, the third operational amplifier U2A and the fourth operational amplifier U2B are two independent operational amplifiers in the LM358. Using only one LM358 chip and several external resistors and capacitors, both triangular wave signal output and duty cycle adjustable pulse signal output can be achieved, which helps reduce the number of circuit components and lower circuit size and cost.

[0033] Specifically, the fourth operational amplifier U2B compares the triangular wave signal and the voltage peak signal. When the voltage value of the triangular wave signal is greater than the voltage value of the voltage peak signal, the output terminal of the fourth operational amplifier U2B outputs a high level. When the voltage value of the triangular wave signal is less than the voltage value of the voltage peak signal, the output terminal of the fourth operational amplifier U2B outputs a low level. The output terminal outputs a pulse signal with high and low levels as the voltage and frequency of the triangular wave signal change. The frequency of this pulse signal is the same as the frequency of the triangular wave signal, and the frequency of the triangular wave signal is the same as the frequency of the multiplied DC signal. Since the voltage value of the peak voltage signal changes with the voltage value of the power frequency AC signal, when the power frequency AC signal voltage increases, the voltage value of the peak voltage signal increases, the high-level pulse width of the pulse signal decreases, and the duty cycle decreases. Conversely, when the power frequency AC signal voltage decreases, the voltage value of the peak voltage signal decreases, the high-level pulse width of the pulse signal increases, and the duty cycle increases. This achieves a pulse signal with adjustable pulse width or adjustable duty cycle, denoted as a duty cycle adjustable pulse signal. The duty cycle of the duty cycle adjustable pulse signal is inversely proportional to the voltage of the power frequency AC signal.

[0034] like Figure 2 As shown, signal sampling was performed at each sampling point (VAC, VDC, Square, Tria, Peak, out), resulting in the following... Figure 3 The signal waveforms at each sampling point are shown.

[0035] The duty cycle adjustable pulse signal can be used to enable the load in the power frequency circuit to operate stably at a constant power even when the external power frequency AC signal voltage fluctuates. For details, please refer to Example 2.

[0036] In summary, the duty cycle adjustable pulse signal output circuit provided in this embodiment of the invention utilizes a rectifier module to convert a power frequency AC signal into a frequency-doubled DC signal. After voltage division and sampling processing, the divided DC signal enters a square wave signal acquisition module and a peak signal acquisition module, respectively. On one hand, the divided DC signal is converted into a stable triangular wave signal after passing through the square wave signal acquisition module and the triangular wave signal acquisition module. On the other hand, the peak signal acquisition module performs peak detection on the divided DC signal and acquires the voltage peak signal. The triangular wave signal and the voltage peak signal are compared by a comparison module to output a duty cycle adjustable pulse signal. The duty cycle of this pulse signal can be dynamically adjusted according to the voltage change of the input power frequency AC signal, forming a duty cycle adjustment mechanism that is inversely proportional to the voltage. This allows the circuit to automatically adjust the duty cycle of the output pulse under different input voltages. The circuit of this invention generates a pulse signal with twice the power frequency and can automatically adjust the pulse width or duty cycle according to the power frequency voltage by using analog circuits instead of relying on inductive or capacitive components. When the power frequency voltage fluctuates within a certain range, the pulse width or duty cycle of the pulse signal output by the circuit will automatically adjust according to the power frequency voltage, thereby ensuring that the load operates at a stable power level. This circuit has adaptive capability, maintaining a constant power output from the load even when the power frequency voltage changes. This allows the load to operate normally under unstable power conditions, avoiding the impact of power fluctuations on equipment performance and greatly improving equipment stability and efficiency.

[0037] Example 2

[0038] Based on the above embodiment one, please refer to Figure 4 This invention provides a constant power frequency circuit, comprising a variable pulse output circuit based on power frequency as described in Embodiment 1, a load, a transistor, and a bias resistor. In the constant power frequency circuit, the base of the transistor Q0 is electrically connected to the output terminal of the duty cycle adjustable pulse signal output circuit, the collector is electrically connected to the negative terminal of the load, and the emitter is grounded via the bias resistor R0. Figure 4 As shown, after being rectified by the rectifier module, the power frequency AC signal is connected to the positive terminal of the load on one hand, and to the voltage divider sampling module on the other hand, and then to the subsequent modules to obtain a duty cycle adjustable pulse signal. When the voltage of the power frequency AC signal increases, the duty cycle of the duty cycle adjustable pulse signal output by the duty cycle adjustable pulse signal output circuit decreases accordingly. When the voltage of the power frequency AC signal decreases, the duty cycle of the duty cycle adjustable pulse signal output by the duty cycle adjustable pulse signal output circuit increases accordingly, so that even if the external power frequency AC signal changes within a certain voltage range, the load can still operate stably at a constant power.

[0039] Example 3

[0040] Based on Embodiment 1 or 2 above, this invention provides a power frequency grid device, which includes a variable pulse output circuit based on power frequency as described in Embodiment 1 or a constant power power frequency circuit as described in Embodiment 2. This power frequency grid device, such as a UPS, uninterruptible power supply, industrial motor control, and voltage protection device for household appliances, can maintain stable power even when the voltage fluctuates within a certain range. It exhibits high stability and energy efficiency, which helps reduce maintenance costs.

[0041] The above provides a detailed description of the power frequency-based variable pulse output circuit provided by this invention. Those skilled in the art will further understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate hardware-software interchangeability, the various illustrative components, blocks, modules, circuits, and steps have been described above in terms of functionality. Whether the functionality is implemented as hardware or software depends on the specific use and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in different ways for each specific use. Any equivalent structural or procedural transformations made using the content of this specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this invention. This should not be construed as a limitation of the invention.

[0042] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A variable pulse output circuit based on power frequency, characterized in that, The circuit includes: a rectifier module, a voltage divider sampling module, a square wave signal acquisition module, a triangular wave signal acquisition module, a peak signal acquisition module, and a comparator module. The output terminal of the rectifier module is electrically connected to the input terminal of the voltage divider sampling module. The output terminal of the voltage divider sampling module is electrically connected to the input terminals of both the square wave acquisition module and the peak signal acquisition module. The output terminal of the square wave acquisition module is electrically connected to the input terminal of the triangular wave signal acquisition module. The output terminals of both the triangular wave signal acquisition module and the peak signal acquisition module are electrically connected to the input terminals of the comparator module. The power frequency AC signal is rectified by the rectifier module and output as a frequency-doubled DC signal. The frequency-doubled DC signal is then divided by the voltage divider sampling module and output as a voltage-divided DC signal. The voltage-divided DC signal is then divided by the square wave signal acquisition module and output as a square wave signal. The square wave signal is then divided by the triangular wave acquisition module and output as a triangular wave signal. The voltage-divided DC signal is then divided by the peak signal acquisition module and output as a voltage peak signal. The triangular wave signal and the voltage peak signal are then compared by the comparator module and output as a duty cycle adjustable pulse signal. The duty cycle of the duty cycle adjustable pulse signal is inversely proportional to the voltage of the power frequency AC signal.

2. The variable pulse output circuit based on power frequency according to claim 1, characterized in that, The rectifier module includes a full-bridge rectifier composed of a first diode, a second diode, a fifth diode, and a sixth diode. The AC input terminal of the full-bridge rectifier is connected to the power frequency AC signal, the positive DC output terminal is electrically connected to the voltage divider sampling module, and the negative DC output terminal is grounded.

3. The variable pulse output circuit based on power frequency according to claim 1, characterized in that, The voltage divider sampling module includes a second resistor and a fourth resistor connected in series. The series node of the second resistor and the fourth resistor is electrically connected to the square wave signal acquisition module and the peak signal acquisition module, respectively. The frequency-doubled DC signal is output as the voltage-divided DC signal at the series node after passing through the voltage divider sampling module.

4. The variable pulse output circuit based on power frequency according to claim 1, characterized in that, The square wave acquisition module includes a first operational amplifier unit and a second operational amplifier unit. The first operational amplifier unit includes a first operational amplifier, a first resistor, a half-bridge rectifier composed of a third diode and a fourth diode, and a second capacitor. The positive input terminal of the first operational amplifier is electrically connected to the voltage divider sampling module. The first resistor is electrically connected between the output terminal and the negative input terminal of the first operational amplifier. The second capacitor is electrically connected between the half-bridge rectifier and ground. The output terminal of the first operational amplifier is electrically connected to the second operational unit via the half-bridge rectifier.

5. The variable pulse output circuit based on power frequency according to claim 4, characterized in that, The second operational amplifier unit includes a second operational amplifier, wherein the positive input terminal of the second operational amplifier is electrically connected to the first operational amplifier unit, the negative input terminal is electrically connected to the voltage divider sampling module, and the output terminal of the second operational amplifier is electrically connected to the triangular wave acquisition module.

6. The variable pulse output circuit based on power frequency according to claim 1, characterized in that, The triangular wave acquisition module includes a third operational amplifier, a third resistor, a sixth resistor, a fifth resistor, and a first capacitor. The negative input terminal of the third operational amplifier is electrically connected to the output terminal of the square wave acquisition module via the fifth resistor. The third resistor and the sixth resistor are connected in series between a 5V voltage and ground. The positive input terminal of the third operational amplifier is electrically connected to the series node of the third resistor and the sixth resistor. The first capacitor is electrically connected between the negative input terminal and the output terminal of the third operational amplifier. The output terminal of the third operational amplifier is electrically connected to the comparison module.

7. The variable pulse output circuit based on power frequency according to claim 1, characterized in that, The peak signal acquisition module includes a seventh diode, a seventh resistor, and a third capacitor. The positive terminal of the seventh diode is electrically connected to the voltage divider sampling module, the negative terminal is electrically connected to the seventh resistor and the third capacitor connected in parallel, and is also electrically connected to the comparison module.

8. The variable pulse output circuit based on power frequency according to any one of claims 1-7, characterized in that, The comparison module includes a fourth operational amplifier, wherein the positive input terminal of the fourth operational amplifier is electrically connected to the output terminal of the triangular wave signal acquisition module, and the negative input terminal is electrically connected to the output terminal of the peak signal acquisition module.

9. A constant power frequency circuit, characterized in that, The circuit includes a power frequency-based variable pulse output circuit as described in any one of claims 1 to 10, a load, a transistor, and a bias resistor. The base of the transistor is electrically connected to the output terminal of the power frequency-based variable pulse output circuit, the collector is electrically connected to the negative terminal of the load, and the emitter is grounded via the bias resistor. The power frequency AC signal is rectified by DC and input to the positive terminal of the load. When the power frequency AC signal voltage increases, the duty cycle of the adjustable pulse signal output by the power frequency-based variable pulse output circuit decreases accordingly. When the power frequency AC signal voltage decreases, the duty cycle of the adjustable pulse signal output by the power frequency-based variable pulse output circuit increases accordingly, thereby achieving constant load power.

10. A power frequency grid device, characterized in that, The device includes a variable pulse output circuit based on power frequency as described in any one of claims 1 to 8 or a constant power power frequency circuit as described in claim 9.

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