Alternating voltage generating circuit and generating method
By using a step-up/step-down power supply module and an alternating voltage generation circuit with phase shift adjustment, the problems of high precision and wide-range stability in existing alternating voltage generation circuits are solved, achieving low-cost and high-efficiency alternating voltage output suitable for applications with multiple loads.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LEN TECH LTD
- Filing Date
- 2026-05-09
- Publication Date
- 2026-06-19
AI Technical Summary
Existing alternating voltage generation circuits struggle to simultaneously meet load requirements in terms of high precision, wide range, and high stability, and are costly when providing alternating voltage to multiple loads.
By combining a buck-boost power supply module, a controller, and a master-slave control module, precise control of alternating voltage is achieved through phase angle adjustment. By utilizing the phase angle conversion between the reference PWM signal and the slave PWM signal, combined with chopping and filtering processing of transistors and inductors and capacitors, high-precision, wide-range alternating voltage is provided.
It achieves high-precision, wide-range, and excellent stability alternating voltage output, reducing design difficulty and cost, and is especially suitable for applications with multiple loads.
Smart Images
Figure CN122247203A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to electrical control, and more particularly to an alternating voltage generating circuit and method. Background Technology
[0002] Alternating voltage generating circuits are widely used in terminal products such as electronically controlled dimming and color-changing displays because they can provide alternating voltages with variable amplitude.
[0003] Alternating voltage amplitude control devices require a wide range of alternating voltages as their operating voltage and are extremely sensitive to the peak-to-peak value (i.e., amplitude) of the alternating voltage received at their terminals. For example, the transparency of dimming glass made of dye-based liquid crystal materials is determined by the mapping relationship between the peak-to-peak value of the alternating voltage and the transmittance. In this case, existing alternating voltage generating circuits can only use their internal buck-boost power supply modules to boost or buck the voltage provided by the power supply equipment to adjust the peak-to-peak value of the alternating voltage across the load to meet the load's power requirements. This requires the buck-boost power supply module, as the core component of the alternating voltage generating circuit, to consistently provide a high-precision, wide-range, and highly stable output voltage. Ideally, the buck-boost power supply module should still be able to provide a high-precision output voltage even in extreme conditions. For example, when dimming glass requires an alternating voltage with a peak-to-peak value close to 0V, the output voltage of the buck-boost power supply module should also be close to 0V to ensure the normal operation of such loads and prevent serious damage to human visual perception. However, in reality, the accuracy of the output voltage of the buck-boost power supply module is difficult to guarantee under extreme operating conditions. The need to satisfy both high precision and wide output range while also taking cost into consideration significantly increases the design difficulty of alternating voltage generation circuits.
[0004] Furthermore, when multiple loads require alternating voltages with different peak-to-peak values, such as setting different transmittance for multiple dimming glasses, a separate alternating voltage generation circuit, including a buck-boost power supply module, is needed for each load to provide alternating voltages with different peak-to-peak values, which further increases hardware costs.
[0005] There is an urgent need for an alternating voltage generating circuit that can achieve high precision, wide range, and high stability at a low cost to meet the stepless dimming requirements, for example, of dyed glass. Summary of the Invention
[0006] To address the technical problems existing in the prior art, this application proposes an alternating voltage generating circuit, comprising: a buck-boost power supply module electrically connected to a power supply, configured to boost or buck the voltage output by the power supply to obtain an amplitude-modulated voltage; wherein the amplitude-modulated voltage output by the buck-boost power supply module is greater than or equal to the peak-to-peak value of the alternating voltage required for normal load operation; a controller configured to generate a reference PWM signal and a slave PWM signal; the reference PWM signal and the slave PWM signal are each a pulse sequence with duty cycles arranged according to a simple harmonic wave law; a main control module, whose first input terminal is electrically connected to the first output terminal of the controller, and whose second input terminal is electrically connected to the output terminal of the buck-boost power supply module; the main control module is configured to generate a reference PWM signal and a slave PWM signal based on the reference PWM signal from the controller. The PWM signal converts the amplitude-modulated voltage into a corresponding reference control signal and provides it to the load; the slave control module has its first input terminal electrically connected to the second output terminal of the controller, and its second input terminal electrically connected to the output terminal of the buck-boost power supply module; the slave control module is configured to convert the amplitude-modulated voltage into a corresponding slave control signal based on the slave PWM signal from the controller and provide it to the load; wherein, any one of the controller, the master control module, or the slave control module is further configured to receive a corresponding adjustment signal, and under the control of the adjustment signal, the initial phase difference between the reference control signal and the slave control signal is a first phase misalignment angle; wherein, the adjustment signal includes information for determining the first phase misalignment angle, and the value of the first phase misalignment angle is adjusted as the adjustment signal changes.
[0007] Specifically, in the alternating voltage generating circuit, the peak-to-peak value of the alternating voltage required for the load to operate normally is related to the amplitude modulation voltage and the first phase misalignment angle.
[0008] Specifically, in the alternating voltage generating circuit, the accuracy of the alternating voltage required for the load to operate normally depends on the accuracy of the first phase misalignment angle.
[0009] Specifically, in the alternating voltage generating circuit, the main control module includes a main drive unit electrically connected to a first input terminal of the main control module; and a first transistor and a second transistor connected in series between the second input terminal of the main control module and ground; the first electrode of the first transistor is electrically connected to the second input terminal of the main control module, the control electrodes of the first transistor and the second transistor are respectively electrically connected to the first output terminal and the second output terminal of the main drive unit, the second electrodes of the first transistor and the first electrodes of the second transistor are electrically connected to each other, and the second electrode of the second transistor is grounded; the main drive unit is configured to convert the reference PWM signal into a signal that controls the alternating conduction of the first transistor and the second transistor. The system includes a first drive signal and a second drive signal; a first transistor and a second transistor configured to chop the amplitude-modulated voltage from the buck-boost power supply module under the control of the first drive signal and the second drive signal, converting the amplitude-modulated voltage into a reference square wave signal and outputting it from the node where the second terminal of the first transistor and the first terminal of the second transistor are electrically connected to each other; a first inductor electrically connected between the node where the second terminal of the first transistor and the first terminal of the second transistor are electrically connected to each other and the output terminal of the main control module; and a first capacitor electrically connected between the output terminal of the main control module and ground; the first inductor and the first capacitor are configured to cooperate with each other to chop the reference square wave signal. The reference square wave is filtered to convert it into a corresponding reference control signal; and the slave control module includes a slave drive unit electrically connected to a first input terminal of the slave control module; and a third transistor and a fourth transistor connected in series between a second input terminal of the slave control module and ground; the first electrode of the third transistor is electrically connected to the second input terminal of the slave control module, the control electrodes of the third transistor and the fourth transistor are electrically connected to the first and second output terminals of the slave drive unit, respectively, the second electrode of the third transistor and the first electrode of the fourth transistor are electrically connected to each other, and the second electrode of the fourth transistor is grounded; the slave drive unit is configured to convert the slave PWM signal into a control signal. The third transistor and the fourth transistor are alternately turned on by a third drive signal and a fourth drive signal; the third transistor and the fourth transistor are configured to alternately turn on under the control of the third drive signal and the fourth drive signal, thereby chopping the amplitude-modulated voltage output by the buck-boost power supply module, converting the amplitude-modulated voltage into a square wave signal and outputting it from the node where the second terminal of the third transistor and the first terminal of the fourth transistor are electrically connected to each other; and it also includes a second inductor electrically connected between the node where the second terminal of the third transistor and the first terminal of the fourth transistor are electrically connected to each other and the output terminal of the main control module; and a second capacitor electrically connected between the output terminal of the slave control module and ground;The second inductor and the second capacitor are configured to cooperate with each other to filter the slave square wave signal to convert it into a corresponding slave control signal; wherein the initial phase difference between the reference square wave signal and the slave control signal is a first phase misalignment angle.
[0010] Specifically, in the alternating voltage generating circuit, the amplitude modulation voltage generated by the buck-boost power supply module is a fixed value.
[0011] Specifically, the alternating voltage generating circuit further includes a controller configured to receive the adjustment signal and generate a reference PWM signal and a slave PWM signal with an initial phase difference of the first phase misalignment angle based on the adjustment signal.
[0012] Specifically, the alternating voltage generating circuit further includes a slave control module configured to receive the adjustment signal and convert the amplitude-modulated voltage into a slave control signal with an initial phase related to a first phase misalignment angle based on the adjustment signal and the slave PWM signal; wherein the initial phase difference between the reference PWM signal and the slave PWM signal is zero.
[0013] Specifically, the alternating voltage generating circuit further includes a main control module configured to receive the adjustment signal and convert the amplitude-modulated voltage into a reference control signal whose initial phase is related to a first phase misalignment angle based on the adjustment signal and the reference PWM signal; wherein the initial phase difference between the reference PWM signal and the slave PWM signal is zero.
[0014] Specifically, in the alternating voltage generating circuit, when the number of loads is N, the number of the buck-boost power supply module, the controller, and the main control module is 1; the number of slave control modules is N; wherein the amplitude modulation voltage output by the buck-boost power supply module is greater than or equal to the maximum peak-to-peak value of the alternating voltage required for normal operation of N loads, where N is a positive integer greater than or equal to 1; and the number of adjustment signals is N, thereby obtaining N first phase misalignment angles; and the values of the N first phase misalignment angles are different for different adjustment signals.
[0015] This application also relates to an electronic device, including an alternating voltage generating circuit as described in any of the preceding applications and N loads; wherein N is a positive integer greater than or equal to 1.
[0016] This application also relates to an alternating voltage generation method, comprising: obtaining an adjustment signal; acquiring an amplitude-modulated voltage, the value of which is greater than or equal to the peak-to-peak value of the alternating voltage required for normal load operation; acquiring a reference PWM signal and a slave PWM signal; wherein the reference PWM signal and the slave PWM signal are each pulse sequences whose duty cycles are arranged according to a simple harmonic wave law; converting the amplitude-modulated voltage into a corresponding reference control signal based on the reference PWM signal, and converting the amplitude-modulated voltage into a corresponding slave control signal based on the slave PWM signal; and wherein the adjustment signal includes information for determining a first phase misalignment angle, and, under the control of the adjustment signal, the phase difference between the reference control signal and the slave control signal is the first phase misalignment angle; the value of the first phase misalignment angle is adjusted according to the change of the adjustment signal.
[0017] Specifically, in the alternating voltage generation method, the peak-to-peak value of the alternating voltage required for the load to operate normally is related to the amplitude modulation voltage and the first phase misalignment angle.
[0018] In particular, in the alternating voltage generation method, the accuracy of the alternating voltage required for the load to operate normally depends on the accuracy of the first phase misalignment angle.
[0019] Specifically, the alternating voltage generation method further includes: converting the amplitude-modulated voltage into a corresponding reference square wave signal based on the reference PWM signal, and converting the reference square wave signal into a corresponding reference control signal; and converting the amplitude-modulated voltage into a corresponding slave square wave signal based on the slave PWM signal, and converting the slave square wave signal into the corresponding slave control signal; wherein the phase difference between the reference square wave signal and the slave square wave signal is a first phase misalignment angle.
[0020] Specifically, in the alternating voltage generation method, the value of the amplitude modulation voltage is a fixed value.
[0021] Specifically, the alternating voltage generation method further includes obtaining a reference PWM signal and a slave PWM signal with an initial phase difference of the first phase misalignment angle based on the adjustment signal.
[0022] Specifically, the alternating voltage generation method further includes converting the amplitude-modulated voltage into a slave control signal with an initial phase related to a first phase misalignment angle based on the adjustment signal and the slave PWM signal; wherein the phase difference between the reference PWM signal and the slave PWM signal is zero.
[0023] Specifically, the alternating voltage generation method further includes converting the amplitude-modulated voltage into a reference control signal with an initial phase related to a first phase misalignment angle based on the adjustment signal and the reference PWM signal; wherein the phase difference between the reference PWM signal and the slave PWM signal is zero.
[0024] Specifically, in the alternating voltage generation method, when the number of loads is N, the number of the reference PWM signal, the amplitude modulation voltage, and the reference control signal is 1; the number of slave PWM signals is N; wherein the amplitude modulation voltage is greater than or equal to the maximum peak-to-peak value of the alternating voltage required for normal operation of each of the N loads; N is a positive integer greater than or equal to 1; and the number of adjustment signals is N, thereby obtaining N first phase misalignment angles; and the values of the N first phase misalignment angles are different for different adjustment signals.
[0025] The alternating voltage generating circuit and method proposed in this application can output alternating voltage with a wide amplitude range, high accuracy, and excellent stability, ensuring stable and reliable operation of the load, avoiding extreme operating conditions for the step-up and step-down power supply module, and significantly reducing the design difficulty and cost of the alternating voltage generating circuit. Attached Figure Description
[0026] The preferred embodiments of this application will now be described in further detail with reference to the accompanying drawings, wherein: Figure 1 The diagram shown is a schematic diagram of an alternating voltage generating circuit according to an embodiment of this application; Figure 2 The diagram shown is a waveform of alternating voltage and related signals applied to a load according to an embodiment of this application; Figure 3 The diagram shown is a schematic diagram of an alternating voltage generating circuit according to another embodiment of this application; Figure 4 The diagram shown is a schematic diagram of an alternating voltage generating circuit according to another embodiment of this application. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0028] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.
[0029] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. The lines connecting the units in the accompanying drawings are merely for illustrative purposes, indicating that at least the units at both ends of the line are communicating with each other, and are not intended to prevent unconnected units from communicating. Furthermore, the number of lines between two units is intended to indicate at least the number of signals involved in communication between the two units or at least the number of output terminals, and is not intended to limit communication between the two units to only the signals shown in the figures.
[0030] A transistor can refer to any type of transistor, such as a field-effect transistor (FET) or a bipolar junction transistor (BJT). When a transistor is a field-effect transistor, depending on the channel material, it can be hydrogenated amorphous silicon, metal oxide, low-temperature polycrystalline silicon, organic transistors, etc. Based on whether the charge carriers are electrons or holes, they can be divided into N-type transistors and P-type transistors. The gate of a field-effect transistor is its control electrode; the first electrode can be the drain or source, and the corresponding second electrode can be the source or drain. The gate or control electrode can be the control electrode. When a transistor is a bipolar junction transistor (BJT), the base is its control electrode; the first electrode can be the collector or emitter, and the corresponding second electrode can be the emitter or collector. The base or control electrode can be the control electrode. Transistors can be manufactured using oxide semiconductor, polycrystalline silicon, amorphous silicon, organic semiconductor, NMOS / PMOS, or CMOS processes.
[0031] The alternating voltage generating circuit and method proposed in this application can provide high-precision, wide-range, and high-stability alternating voltages that meet the requirements for normal load operation. Furthermore, it significantly reduces the design difficulty and cost of the alternating voltage generating circuit, greatly improving the user experience. In particular, it greatly saves hardware costs when providing alternating voltages to multiple loads.
[0032] Figure 1 The diagram shown is a schematic diagram of an alternating voltage generating circuit according to an embodiment of this application.
[0033] According to one embodiment, an alternating voltage generating circuit (hereinafter referred to as the generating circuit) may include a buck-boost power supply module 11 electrically connected to a power supply, configured to boost or buck the voltage output by the power supply to obtain an amplitude-modulated voltage Vs output at node S. The value of the amplitude-modulated voltage Vs is related to the peak-to-peak value of the alternating voltage required for normal load operation. In one embodiment, the amplitude-modulated voltage Vs output by the buck-boost power supply module 11 may be a fixed value obtained using a fixed-output buck-boost power supply module. In another embodiment of this application, the amplitude-modulated voltage Vs output by the buck-boost power supply module 11 may also be a variable value obtained using a variable-output buck-boost power supply module.
[0034] According to one embodiment, the generating circuit may include a controller 12 configured to generate corresponding reference PWM signals and slave PWM signals based on received adjustment signals. The controller 12 may be a control-enabled device such as an MCU or FPGA. The reference PWM signal and the slave PWM signal are each a pulse sequence with duty cycles arranged according to a simple harmonic wave pattern, i.e., arranged according to a sine or cosine wave pattern. In one embodiment, the controller 12 may include a first output terminal and a second output terminal, the first output terminal being configured to output the reference PWM signal and the second output terminal being configured to output the slave PWM signal.
[0035] According to one embodiment, the adjustment signal can be set by the user according to actual needs, such as an electrical signal generated by a button, a light transmittance requirement, or a gear signal.
[0036] According to one embodiment of this application, the frequency difference between the reference PWM signal and the slave PWM signal does not exceed one time. According to another embodiment, the reference PWM signal and the slave PWM signal have the same frequency.
[0037] According to one embodiment, the generating circuit may include a main control module 13, whose first input terminal is electrically connected to the first output terminal of the controller 12, and whose second input terminal is electrically connected to the output terminal (node S) of the buck-boost power supply module 11. The main control module 13 is configured to receive the amplitude-modulated voltage Vs output by the buck-boost power supply module 11 and the reference PWM signal output by the controller 12, and convert the amplitude-modulated voltage Vs into a corresponding reference control signal VA_FT based on the reference PWM signal.
[0038] According to one embodiment, the generating circuit may further include a slave control module 14, whose first input is electrically connected to the second output of the controller 12, and whose second input is electrically connected to the output of the buck-boost power supply module 11. The slave control module 14 is configured to receive the amplitude-modulated voltage Vs output by the buck-boost power supply module 11 and the slave PWM signal output by the controller 12, and convert the amplitude-modulated voltage Vs into a corresponding slave control signal VB_FT based on the slave PWM signal.
[0039] According to one embodiment, the reference control signal VA_FT and the slave control signal VB_FT can be signals with the same frequency containing sine or cosine wave components, and their initial phase difference is a first phase misalignment angle.
[0040] According to one embodiment, the adjustment signal may include information for determining a first phase misalignment angle. The value of the first phase misalignment angle may be adjusted as the adjustment signal changes.
[0041] According to one embodiment of this application, the controller 12 uses the initial phase difference between the reference PWM signal generated by the adjustment signal and the slave PWM signal as a first phase angle.
[0042] According to one embodiment, the main control module 13 may include a main drive unit 131 electrically connected to a first input terminal of the main control module 13, and a first transistor 132 and a second transistor 133 connected in series between a second input terminal (node S) of the main control module 13 and ground. The first electrode of the first transistor 132 is electrically connected to the second input terminal of the main control module 13, and the control electrodes of the first transistor 132 and the second transistor 133 are respectively electrically connected to the first output terminal and the second output terminal of the main drive unit 131. The second electrodes of the first transistor 132 and the first electrodes of the second transistor 133 are electrically connected to each other at node A, and the second electrode of the second transistor 133 is grounded. The main drive unit 131 is configured to convert a reference PWM signal from the controller 12 into a first drive signal and a second drive signal that control the alternating conduction of the first transistor 132 and the second transistor 133. The first transistor 132 and the second transistor 133 are configured to chop the amplitude-modulated voltage Vs provided by the buck-boost power supply module 11 under the control of the first drive signal and the second drive signal, converting the amplitude-modulated voltage Vs into a reference square wave signal VA and outputting it from node A.
[0043] In one embodiment, the reference square wave signal VA can be a pulse sequence whose duty cycle, corresponding to the reference PWM signal, is arranged according to a sine or cosine law. In another embodiment, the reference square wave signal VA can have the same frequency as the reference PWM signal, but their amplitudes are different.
[0044] According to one embodiment of this application, the first transistor 132 and the second transistor 133 can be N-type or P-type transistors of the same type. The first transistor 132 and the second transistor 133 have the same dimensions.
[0045] According to one embodiment, the main control module 13 may further include a first inductor L134 electrically connected between node A and the output terminal of the main control module 13, and a first capacitor C135 electrically connected between the output terminal of the main control module 13 and ground. The first inductor L134 and the first capacitor C135 are configured to cooperate with each other to filter the reference square wave signal VA output by node A to convert the reference square wave signal VA into a corresponding reference control signal VA_FT.
[0046] In one embodiment, the reference control signal VA_FT is a signal corresponding to the reference square wave signal VA with a sine wave or cosine wave component, the peak-to-peak value of which is less than or equal to the amplitude of the reference square wave signal VA.
[0047] According to one embodiment, the control module 14 may include a slave drive unit 141 electrically connected to a first input terminal of the control module 14, and a third transistor 142 and a fourth transistor 143 connected in series between a second input terminal (node S) of the control module 14 and ground. The first electrode of the third transistor 142 is electrically connected to the second input terminal of the control module 14, and the control electrodes of the third transistor 142 and the fourth transistor 143 are electrically connected to the first and second output terminals of the slave drive unit 141, respectively. The second electrode of the third transistor 142 and the first electrode of the fourth transistor 143 are electrically connected to each other at node B, and the second electrode of the fourth transistor 143 is grounded. The slave drive unit 141 is configured to convert a slave PWM signal from the controller 12 into a third drive signal and a fourth drive signal that control the alternating conduction of the third transistor 142 and the fourth transistor 143. The third transistor 142 and the fourth transistor 143 are configured to alternately conduct under the control of the third drive signal and the fourth drive signal, thereby performing chopping processing on the amplitude-modulated voltage Vs output by the buck-boost power supply module 11, converting the amplitude-modulated voltage Vs into a square wave signal VB and outputting it from node B.
[0048] In one embodiment, the square wave signal VB can be a pulse sequence with duty cycles arranged in a sine or cosine pattern corresponding to the PWM signal. In another embodiment, the square wave signal VB can have the same frequency as the PWM signal, but their amplitudes can be different.
[0049] According to one embodiment of this application, the third transistor 142 and the fourth transistor 143 can be N-type or P-type transistors of the same type. The third transistor 142 and the fourth transistor 143 can be of the same size.
[0050] In one embodiment of this application, the slave control module 14 may further include a second inductor L144 electrically connected between node B and the output terminal of the slave control module 14, and a second capacitor C145 electrically connected between the output terminal of the slave control module 14 and ground. The second inductor L144 and the second capacitor C145 are configured to cooperate with each other to filter the slave square wave signal VB output by node B to convert the slave square wave signal VB into a corresponding slave control signal VB_FT.
[0051] In one embodiment, the control signal VB_FT can be a signal corresponding to the square wave signal VB with a sine or cosine wave component, the peak-to-peak value of which is less than or equal to the amplitude of the reference square wave signal VB.
[0052] According to one embodiment, the outputs of the master control circuit 13 and the slave control circuit 14 are electrically connected to the load 15, respectively. The load 15 is configured to receive a reference control signal VA_FT and a slave control signal VB_FT, and operates based on both.
[0053] According to one embodiment, the amplitude modulation voltage Vs output by the buck-boost power supply module 11 can be greater than or equal to the peak-to-peak value of the alternating voltage required for the load 15 to operate normally.
[0054] In particular, the generating circuit proposed in this application can use a fixed output buck-boost power supply module, which helps to further reduce the overall cost of the generating circuit.
[0055] Figure 2 The diagram shows the waveform of an alternating voltage and related signals applied to a load according to an embodiment of this application.
[0056] In this application, the amplitude-modulated voltage Vs output by the buck-boost power supply module 11 is chopped before... Figure 1 At midpoint A and point B, a set of reference square wave signals VA and slave square wave signals VB, with duty cycles varying according to a sine wave pattern, are generated respectively, as follows: Figure 2 The waveforms of VA and VB are shown in the diagram. The initial phase difference between the reference square wave signal VA and the slave square wave signal VB is the first phase misalignment angle. After filtering, these two square wave signals yield the reference control signal VA_FT and the slave control signal VB_FT, which contain a DC bias voltage component (not shown) and a sine wave component. The initial phase difference between them is the first phase misalignment angle, as shown in the diagram. Figure 2 The waveforms of VA_FT and VB_FT are shown below. The DC bias voltage values for both are equal.
[0057] The following formula is only for illustrating the working principle of the generation circuit proposed in this application and does not limit the value of the initial phase of the reference control signal VA_FT.
[0058] In this application, the reference control signal VA_FT and the slave control signal VB_FT can be approximated as follows: (1) (2) in, θ The initial phase of the control signal VB_FT is the phase at t=0. The initial phase of the reference control signal VA_FT is 0°.
[0059] Subtracting formula (1) from formula (2) yields the alternating voltage applied to the load. (3) in ， For the initial phase and θ The relevant standard sine wave signal; |Sin(θ / 2)| has a minimum value of 0 and a maximum value of 1. In this case, the first phase misalignment angle between the reference control signal and the slave control signal is... θ The alternating voltage VLoad applied to the load has a peak-to-peak value of |Vs* sin(θ / 2)| and its initial phase is... θ The relevant sinusoidal signal. That is, the peak-to-peak value |Vs*sin(θ / 2)| of the alternating voltage VLoad can be controlled by the first phase shift angle and the amplitude modulation voltage Vs. The accuracy of the alternating voltage VLoad depends on the accuracy of the first phase shift angle.
[0060] In this application, regardless of the initial phase angle of the reference control signal VA_FT and the slave control signal VB_FT, the amplitude modulation voltage Vs can be controlled by adjusting the first phase misalignment angle between them so that the alternating voltage VLoad meets the peak-to-peak value requirement of the alternating voltage required for normal operation of the load.
[0061] According to one embodiment of this application, the first phase misalignment angle can be calculated based on the peak-to-peak voltage required for the load to operate normally.
[0062] In this application, the amplitude modulation voltage Vs of the buck-boost power supply module needs to be greater than or equal to the maximum peak-to-peak value of the alternating voltage required by the load, and it needs to be coordinated with the first phase shift angle to obtain the peak-to-peak value of the alternating voltage that meets the load requirements. Therefore, in this application, the amplitude modulation voltage provided by the buck-boost power supply module 11, whether it is a fixed value or a variable value, can avoid operating itself under harsh conditions, which greatly reduces the design difficulty and cost of the generating circuit.
[0063] Figure 3The diagram shown is a schematic diagram of an alternating voltage generating circuit according to another embodiment of this application. Figure 3 In the generating circuit shown, the controller 32 is configured to generate a reference PWM signal and a slave PWM signal, wherein the initial phase of the reference PWM signal and the slave PWM signal can be any value, and the initial phase difference between the reference PWM signal and the slave PWM signal is zero.
[0064] According to one embodiment, the main control module 33 is configured to receive an adjustment signal, an amplitude-modulated voltage Vs, and a reference PWM signal provided by the controller 32, and convert the amplitude-modulated voltage into a reference control signal VA_FT based on the adjustment signal and the reference PWM signal. The initial phase of the reference control signal VA_FT is related to a first phase misalignment angle. The slave control module 34 is configured to convert the amplitude-modulated voltage Vs into a corresponding slave control signal VB_FT based on the slave PWM signal output by the controller 32. The initial phase of the slave PWM signal is equal to that of the slave control signal VB_FT.
[0065] According to one embodiment, the main control module 33 may include a main drive unit 331 with phase processing capability or phase shifting capability, configured to receive an adjustment signal and a reference PWM signal, based on which the amplitude modulation voltage Vs is converted into a reference square wave signal VA with an initial phase related to a first phase misalignment angle.
[0066] In another embodiment of this application, the slave control module in the generating circuit is configured to receive an adjustment signal, an amplitude-modulated voltage Vs, and a slave PWM signal generated by the controller, and convert the amplitude-modulated voltage into a slave control signal VB_FT based on the adjustment signal and the slave PWM signal. The initial phase of the slave control signal VB_FT is related to a first phase misalignment angle. In this case, the master control module is configured to convert the amplitude-modulated voltage Vs into a corresponding reference control signal VA_FT based on a reference PWM signal output by the controller. The initial phases of the reference PWM signal and the reference control signal VA_FT are equal. In this case, the slave control module may include a slave drive unit with phase processing or phase shifting capabilities, such that the initial phase of the slave square wave signal VB is related to the first phase misalignment angle.
[0067] Figure 4 The diagram shown is a schematic diagram of an alternating voltage generating circuit according to another embodiment of this application.
[0068] In existing alternating voltage generating circuits, for each additional load, the generating circuit needs to be configured with corresponding buck-boost power supply modules, main control modules, and slave control modules for the load.
[0069] Based on the alternating voltage generating circuit proposed in this application, only a corresponding slave control module needs to be added for each additional load. That is, the generating circuit only requires one buck-boost power supply module, one controller, one master control module, and N slave control modules to provide the required alternating voltage to each of the N loads. This significantly reduces the overall system layout and lowers system cost. Here, N is a positive integer greater than or equal to 1.
[0070] exist Figure 4 In the illustrated embodiment, the alternating voltage generating circuit is configured to provide alternating voltage to N loads. The generating circuit includes a buck-boost power supply module 41 electrically connected to the power supply, configured to boost or buck the voltage output by the power supply to obtain an amplitude-modulated voltage Vs.
[0071] The alternating voltage generating circuit proposed in this application can provide alternating voltage to N loads, and all N adjustment signals (adjustment signal 1 to adjustment signal n) can be applied to the controller or applied to N slave control modules respectively.
[0072] According to one embodiment, the generating circuit may further include a controller 42 configured to convert the received N adjustment signals (adjustment signal 1 to adjustment signal n) into a reference PWM signal and N slave PWM signals. Accordingly, the controller 42 includes N+1 output terminals configured to output the reference PWM signal and the N PWM signals, respectively. The number of controllers 42 is one. Each of the adjustment signals 1 to n includes information for determining a corresponding first phase misalignment angle.
[0073] According to one embodiment, the generating circuit may further include a main control module 43 electrically connected to the controller 42 and the buck-boost power supply module 41, and N slave control modules. A first input terminal of the main control module 43 is electrically connected to the controller 42, and a second input terminal is electrically connected to the output terminal of the buck-boost power supply module 41. The main control module 43 is configured to receive a reference PWM signal output from the controller 42 and an amplitude-modulated voltage Vs output from the buck-boost power supply module 41, and convert the amplitude-modulated voltage Vs into a corresponding reference control signal VA_FT based on the reference PWM signal.
[0074] According to one embodiment, the generating circuit may further include N slave control modules 441 to 44n. Each of the slave control modules 441 to 44n has a first input terminal electrically connected to a corresponding output terminal of the controller 42, configured to receive its respective slave PWM signal. Each of the slave control modules 441 to 44n has a second input terminal electrically connected to the output terminal of the buck-boost power supply module 41, configured to receive the amplitude-modulated voltage Vs. The slave control modules 441 to 44n are configured to convert the amplitude-modulated voltage Vs into corresponding slave control signals VB_FT1 to VB_FTn based on their respective received slave PWM signals.
[0075] According to one embodiment, the main control module 43 is further configured to convert the amplitude-modulated voltage Vs into a reference square wave signal based on the reference PWM signal, and further convert the reference square wave signal VA into a corresponding reference control signal VA_FT.
[0076] According to one embodiment, control modules 441 to 44n are further configured to convert amplitude-modulated voltages into corresponding slave square wave signals based on their respective received slave PWM signals, and further convert each slave square wave signal into its respective corresponding slave control signal.
[0077] According to one embodiment, the initial phase difference between the reference control signal VA_FT and the control signals VB_FT1 to VB_FTn is obtained respectively, thereby obtaining N first phase misalignment angles. The values of the N first phase misalignment angles are also different for different adjustment signals.
[0078] According to one embodiment, the first terminals of each of loads 451 to 45n are electrically connected to the output terminal of the main control module 43, configured to receive the reference control signal VA_FT output by the main control module 43. The second terminals of each of loads 451 to 45n are electrically connected to the output terminal of the corresponding slave control module, configured to receive the slave control signal output by the corresponding slave control module.
[0079] According to one embodiment, when the peak-to-peak values of the alternating voltages required for normal operation of N loads are different, the value of the amplitude-modulated voltage Vs output by the buck-boost power supply module 41 can be greater than or equal to the maximum peak-to-peak value of the alternating voltages required for normal operation of the N loads. By adjusting the first phase angle between the reference control signal VA_FT and the control signals VB_FT1 to VB_FTn, the peak-to-peak value of the alternating voltage required by each load can be obtained.
[0080] In another embodiment of this application, the N slave control modules are further configured to receive N adjustment signals, thereby generating N slave control signals whose initial phase is related to the first phase misalignment angle.
[0081] This application also relates to a method for generating alternating voltage.
[0082] According to one embodiment, the alternating voltage generation method includes obtaining an adjustment signal.
[0083] According to one embodiment, the alternating voltage generation method further includes acquiring an amplitude-modulated voltage. The amplitude-modulated voltage is either a fixed value or a variable value; the value of the amplitude-modulated voltage is greater than or equal to the peak-to-peak value of the alternating voltage required for normal load operation.
[0084] According to one embodiment, the alternating voltage generation method may further include acquiring a reference PWM signal and a slave PWM signal; converting the amplitude-modulated voltage into a reference control signal based on the reference PWM signal; and converting the amplitude-modulated voltage into a slave control signal based on the slave PWM signal.
[0085] According to one embodiment, under the control of the adjustment signal, the initial phase difference between the reference control signal and the slave control signal is a first phase misalignment angle. Furthermore, the value of the first phase misalignment angle is adjusted as the adjustment signal changes.
[0086] According to one embodiment, the alternating voltage generation method may further include converting an amplitude-modulated voltage into a reference square wave signal based on a reference PWM signal, and converting the reference square wave signal into a corresponding reference control signal. Additionally, it may also include converting an amplitude-modulated voltage into a slave square wave signal based on a slave PWM signal, and converting the slave square wave signal into a corresponding slave control signal. The reference square wave signal and the slave square wave signal may be two signals with the same frequency, and their initial phase difference may be a first phase misalignment angle.
[0087] In one embodiment of this application, the alternating voltage generation method may further include obtaining a reference PWM signal and a slave PWM signal based on an adjustment signal, wherein the initial phase difference between the reference PWM signal and the slave PWM signal is a first phase misalignment angle.
[0088] In another embodiment of this application, the alternating voltage generation method may further include obtaining a reference square wave signal related to a first phase misalignment angle based on an adjustment signal, an amplitude-modulated voltage, and a reference PWM signal. Alternatively, it may obtain a slave square wave signal related to the first phase misalignment angle based on an adjustment signal, an amplitude-modulated voltage, and a slave PWM signal. The phase difference between the reference PWM signal and the slave PWM signal is zero.
[0089] According to one embodiment, in the alternating voltage generation method, when the number of loads is N, N adjustment signals are acquired respectively, thereby obtaining a reference PWM signal and N slave PWM signals. Based on the N slave PWM signals, the amplitude-modulated voltage is converted into N corresponding slave control signals VB_FT1 to VB_FTn. In this case, the amplitude-modulated voltage is greater than or equal to the maximum peak-to-peak value of the alternating voltage required for normal operation of each of the N loads, and the number of first phase misalignment angles is N.
[0090] The alternating voltage generating circuit proposed in this application not only meets the requirements of the electrical load for the required alternating voltage accuracy and range, but also significantly reduces the cost of the generating circuit. The peak-to-peak value of the alternating voltage provided by the generating circuit can be changed by adjusting the value of the first phase angle.
[0091] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art can make various changes and modifications without departing from the scope of this application. Therefore, all equivalent technical solutions should also fall within the scope of this application.
Claims
1. An alternating voltage generating circuit, comprising: A step-up / step-down power supply module, electrically connected to a power supply, is configured to boost or buck the output voltage of the power supply to obtain an amplitude-modulated voltage; wherein... The amplitude modulation voltage output by the buck-boost power supply module is greater than or equal to the peak-to-peak value of the alternating voltage required for the load to operate normally. The controller is configured to generate a reference PWM signal and a slave PWM signal; the reference PWM signal and the slave PWM signal are each a pulse sequence with duty cycles arranged according to a simple harmonic wave pattern. The main control module has its first input terminal electrically connected to the first output terminal of the controller, and its second input terminal electrically connected to the output terminal of the buck-boost power supply module; the main control module is configured to convert the amplitude modulation voltage into a corresponding reference control signal based on the reference PWM signal from the controller and provide it to the load; The slave control module has its first input terminal electrically connected to the second output terminal of the controller, and its second input terminal electrically connected to the output terminal of the buck-boost power supply module; the slave control module is configured to convert the amplitude-modulated voltage into a corresponding slave control signal based on the slave PWM signal from the controller and provide it to the load; The controller, main control module, or slave control module is further configured to receive a corresponding adjustment signal, and under the control of the adjustment signal, make the initial phase difference between the reference control signal and the slave control signal a first phase misalignment angle; wherein the adjustment signal includes information for determining the first phase misalignment angle, and the value of the first phase misalignment angle is adjusted as the adjustment signal changes.
2. The alternating voltage generating circuit according to claim 1, wherein, The peak-to-peak value of the alternating voltage required for the load to operate normally is related to the amplitude modulation voltage and the first phase misalignment angle.
3. The alternating voltage generating circuit according to claim 2, wherein, The accuracy of the alternating voltage required for the load to operate normally depends on the accuracy of the first phase misalignment angle.
4. The alternating voltage generating circuit according to claim 3, wherein, The main control module includes, A main drive unit is electrically connected to a first input terminal of the main control module; and a first transistor and a second transistor are connected in series and electrically connected between the second input terminal of the main control module and ground; the first electrode of the first transistor is electrically connected to the second input terminal of the main control module, the control electrodes of the first transistor and the second transistor are respectively electrically connected to the first output terminal and the second output terminal of the main drive unit, the second electrodes of the first transistor and the first electrodes of the second transistor are electrically connected to each other, and the second electrode of the second transistor is grounded; the main drive unit is configured to convert the reference PWM signal into a first drive signal and a second drive signal that control the first transistor and the second transistor to conduct alternately; the first transistor and the second transistor are configured to chop the amplitude-modulated voltage from the buck-boost power supply module under the control of the first drive signal and the second drive signal, convert the amplitude-modulated voltage into a reference square wave signal and output it from the node where the second electrode of the first transistor and the first electrode of the second transistor are electrically connected to each other; it also includes... The first inductor is electrically connected between the node where the second pole of the first transistor and the first pole of the second transistor are electrically connected to each other and the output terminal of the main control module. The first inductor and the first capacitor are electrically connected between the output terminal of the main control module and ground; the first inductor and the first capacitor are configured to cooperate with each other to filter the reference square wave to convert the reference square wave into the corresponding reference control signal. as well as The slave control module includes, The drive unit is electrically connected to the first input terminal of the control module. Furthermore, the third and fourth transistors are electrically connected in series between the second input terminal of the control module and ground; the first electrode of the third transistor is electrically connected to the second input terminal of the control module, and the control electrodes of the third and fourth transistors are electrically connected to the first and second output terminals of the drive unit, respectively; the second electrode of the third transistor and the first electrode of the fourth transistor are electrically connected to each other, and the second electrode of the fourth transistor is grounded; the drive unit is configured to convert the PWM signal into a third drive signal and a fourth drive signal that control the third and fourth transistors to conduct alternately; the third and fourth transistors are configured to conduct alternately under the control of the third drive signal and the fourth drive signal, thereby chopping the amplitude-modulated voltage output by the buck-boost power supply module, converting the amplitude-modulated voltage into a square wave signal, and outputting it from the node where the second electrode of the third transistor and the first electrode of the fourth transistor are electrically connected to each other; And, also includes The second inductor is electrically connected between the node where the second pole of the third transistor and the first pole of the fourth transistor are electrically connected to each other and the output terminal of the main control module. And a second capacitor, electrically connected between the output terminal of the slave control module and ground; the second inductor and the second capacitor are configured to cooperate with each other to filter the slave square wave signal to convert the slave square wave signal into the corresponding slave control signal; The initial phase difference between the reference square wave signal and the slave control signal is the first phase misalignment angle.
5. The alternating voltage generating circuit according to claim 4, wherein, The amplitude modulation voltage generated by the buck-boost power supply module is a fixed value.
6. The alternating voltage generating circuit according to claim 5 further includes, The controller is configured to receive the adjustment signal and generate, based on the adjustment signal, the reference PWM signal and the slave PWM signal with an initial phase difference of the first phase misalignment angle.
7. The alternating voltage generating circuit according to claim 5 further includes, The slave control module is further configured to receive the adjustment signal and convert the amplitude-modulated voltage into the slave control signal with an initial phase related to a first phase misalignment angle based on the adjustment signal and the slave PWM signal; in, The initial phase difference between the reference PWM signal and the slave PWM signal is zero.
8. The alternating voltage generating circuit according to claim 5 further includes, The main control module is also configured to receive the adjustment signal and convert the amplitude modulation voltage into the reference control signal whose initial phase is related to the first phase misalignment angle based on the adjustment signal and the reference PWM signal. in, The initial phase difference between the reference PWM signal and the slave PWM signal is zero.
9. The alternating voltage generating circuit according to claim 6 or 7, wherein, When the number of loads is N, the number of each of the buck-boost power supply module, controller, and main control module is 1; the number of slave control modules is N; wherein, The amplitude modulation voltage output by the buck-boost power supply module is greater than or equal to N times the maximum peak-to-peak value of the alternating voltage required for normal operation of the load, where N is a positive integer greater than or equal to 1; and the number of the adjustment signals is N, thereby obtaining N first phase misalignment angles; and the values of the N first phase misalignment angles are different for different adjustment signals.
10. An electronic device comprising an alternating voltage generating circuit as described in any one of claims 1-9 and N loads; wherein, N is a positive integer greater than or equal to 1.
11. A method for generating alternating voltage, comprising: Obtain the adjustment signal; Obtain the amplitude modulation voltage, the value of which is greater than or equal to the peak-to-peak value of the alternating voltage required for the load to operate normally; Acquire a reference PWM signal and a slave PWM signal; wherein the reference PWM signal and the slave PWM signal are each a pulse sequence whose duty cycle is arranged according to a simple harmonic wave law; The amplitude-modulated voltage is converted into a corresponding reference control signal based on the reference PWM signal, and the amplitude-modulated voltage is converted into a corresponding slave control signal based on the slave PWM signal; and The adjustment signal includes information for determining a first phase misalignment angle, and under the control of the adjustment signal, the phase difference between the reference control signal and the slave control signal is the first phase misalignment angle; the value of the first phase misalignment angle is adjusted as the adjustment signal changes.
12. The alternating voltage generation method according to claim 11, wherein, The peak-to-peak value of the alternating voltage required for the load to operate normally is related to the amplitude modulation voltage and the first phase misalignment angle.
13. The alternating voltage generation method according to claim 12, wherein, The accuracy of the alternating voltage required for the load to operate normally depends on the accuracy of the first phase misalignment angle.
14. The alternating voltage generation method according to claim 13, further comprising: Based on the reference PWM signal, the amplitude-modulated voltage is converted into a corresponding reference square wave signal, and the reference square wave signal is converted into a corresponding reference control signal; and... Based on the PWM signal, the amplitude-modulated voltage is converted into a corresponding square wave signal, and the square wave signal is converted into a corresponding control signal. in, The phase difference between the reference square wave signal and the slave square wave signal is the first phase misalignment angle.
15. The alternating voltage generation method according to claim 14, wherein, The amplitude modulation voltage is a fixed value.
16. The alternating voltage generation method according to claim 15, further comprising: The reference PWM signal and the slave PWM signal are obtained based on the adjustment signal, with an initial phase difference of the first phase misalignment angle.
17. The alternating voltage generation method according to claim 15, further comprising: Based on the adjustment signal and the slave PWM signal, the amplitude-modulated voltage is converted into a slave control signal whose initial phase is related to the first phase misalignment angle; wherein... The phase difference between the reference PWM signal and the slave PWM signal is zero.
18. The alternating voltage generation method according to claim 15, further comprising: Based on the adjustment signal and the reference PWM signal, the amplitude-modulated voltage is converted into a reference control signal whose initial phase is related to the first phase misalignment angle; wherein... The phase difference between the reference PWM signal and the slave PWM signal is zero.
19. The alternating voltage generation method according to claim 16 or 17, wherein, When the number of loads is N, the number of the reference PWM signal, the amplitude modulation voltage, and the reference control signal is 1; the number of slave PWM signals is N. Wherein, the amplitude modulation voltage is greater than or equal to the maximum peak-to-peak value of the alternating voltage required for normal operation of each of the N loads; N is a positive integer greater than or equal to 1; and the number of the adjustment signals is N, thereby obtaining N first phase misalignment angles; and, for different adjustment signals, the values of the N first phase misalignment angles are different.