Sine wave generating circuits and electronic devices

Abstract

This application discloses a sine wave generation circuit and an electronic device. The sine wave generation circuit includes a first signal conversion module, a Class D amplifier, a second signal conversion module, and a voltage control module. The first signal conversion module converts a square wave signal into a first sine wave signal with adjustable amplitude. The Class D amplifier amplifies and modulates the power of the first sine wave signal, and then outputs a high-frequency carrier pulse-width modulated signal. The second signal conversion module demodulates and boosts the high-frequency carrier pulse-width modulated signal to output a second sine wave signal. The voltage control module outputs an adjustment signal to the first signal conversion module to adjust the amplitude of the first sine wave signal based on the control signal and the second sine wave signal until the voltages of the control signal and the second sine wave signal satisfy a preset relationship. This method allows for the output of a corresponding sine wave signal according to user needs, and is highly reliable due to its high conversion efficiency.

Description

[Technical Field]

[0001] (CROSS REFERENCE TO RELATED INVENTIONS) This application claims priority from a Chinese patent application entitled "Sine wave generating circuit and electronic device," filed with the China Patent Office on February 1, 2024, bearing application number 202410158077.5, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of power electronics, and more particularly to sine wave generating circuits and electronic equipment. [Background technology]

[0003] A high-voltage sine wave is a voltage waveform characterized by a periodically varying sinusoidal waveform. In power systems, high-voltage sine waves are commonly used in power transmission and distribution to provide industrial, commercial, and residential power. To meet the needs of various applications, high-voltage sine waves must be generated through specific circuits.

[0004] However, the circuits currently used to generate high-voltage sine waves have low conversion efficiency, which can lead to device heat generation, damage, and reduced reliability. Summary of the Invention

[0005] The embodiments of the present application aim to provide a sine wave generating circuit and electronic device that can output a corresponding sine wave signal according to user needs, has high conversion efficiency, and is highly reliable.

[0006] To achieve the above object, in a first aspect, the present application provides a sine wave generating circuit including: a first signal conversion module for inputting a square wave signal and converting the square wave signal into a first sine wave signal having an adjustable amplitude; a class D amplifier connected to the first signal conversion module for inputting the first sine wave signal and power amplifying and modulating the first sine wave signal to output a high frequency carrier pulse width modulated signal; a second signal conversion module connected to the class D amplifier for inputting the high frequency carrier pulse width modulated signal and demodulating and boosting the high frequency carrier pulse width modulated signal to output a second sine wave signal; and a voltage control module connected between the second signal conversion module and the first signal conversion module for inputting the second sine wave signal and a control signal, and outputting an adjustment signal to the first signal conversion module based on the control signal and the second sine wave signal to adjust the amplitude of the first sine wave signal until a voltage between the control signal and the second sine wave signal satisfies a preset relationship.

[0007] In one or more embodiments, the first signal conversion module includes a signal conversion unit and a signal amplification unit, the signal conversion unit is configured to input the square wave signal and convert the square wave signal into a third sine wave signal, the signal amplification unit is connected to the signal conversion unit, input the third sine wave signal, and output the first sine wave signal based on the third sine wave signal, and the amplitude of the first sine wave signal is determined by the amplitude of the third sine wave signal and a gain of the signal amplification unit.

[0008] In one or more embodiments, when the Class D amplifier has a single-ended output, the second signal conversion module includes a first filter unit and a first boost unit. The first filter unit is connected between the Class D amplifier and the first boost unit. The first filtering unit is configured to filter the high-frequency carrier pulse-width modulated signal so as to demodulate the high-frequency carrier pulse-width modulated signal. The first boost unit is configured to boost the demodulated signal of the high-frequency carrier pulse-width modulated signal to output the second sine wave signal.

[0009] In one or more embodiments, the first filter unit includes a first inductance, a first capacitor, and a second capacitor. The first boost unit includes a first transformer, and a first end of the first inductance is connected to the Class D amplifier. The second end of the first inductance is connected to a first end of the first capacitor and a first end of the second capacitor, respectively. The second end of the first capacitor is connected to a first end of a primary winding of the first transformer. The second end of the second capacitor, the second end of the primary winding of the first transformer, and the second end of the secondary winding of the first transformer are all connected to a first ground. The first end of the secondary winding of the first transformer outputs the second sine wave signal.

[0010] In one or more embodiments, when the Class D amplifier has a differential output, the second signal conversion module includes a second filter unit, a third filter unit, and a second boost unit. The second filter unit and the third filter unit are connected between the Class D amplifier and the second boost unit. The second filter unit and the third filter unit are configured to filter the high-frequency carrier pulse-width modulated signal so as to demodulate the high-frequency carrier pulse-width modulated signal. The second boost unit is configured to boost the demodulated signal of the high-frequency carrier pulse-width modulated signal and output the second sine wave signal.

[0011] In one or more embodiments, the second filter unit includes a third capacitor and a second inductance, and the third filter unit includes a fourth capacitor and a third inductance. The second boost unit includes a second transformer. A first end of the second inductance is connected to the in-phase output terminal of the Class D amplifier. A second end of the second inductance is connected to the first end of the third capacitor and the first end of the primary winding of the second transformer, respectively. A first end of the third inductance is connected to the in-phase output terminal of the Class D amplifier. A second end of the third inductance is connected to the first end of the fourth capacitor and the second end of the primary winding of the second transformer, respectively. The second end of the third capacitor, the second end of the fourth capacitor, and the second end of the secondary winding of the second transformer are connected to a first ground. The first end of the secondary winding of the second transformer outputs the second sine wave signal.

[0012] In one or more embodiments, the voltage control module includes a signal processing unit, a voltage sampling unit, and a signal output unit. The signal processing unit is connected to the signal output unit and configured to input the control signal, level-convert the control signal, and output it to the signal output unit. The voltage sampling unit is connected between the second signal conversion module and the signal output unit and configured to sample the second sine wave signal and output a second voltage corresponding to the second sine wave signal to the signal output unit. The signal output unit is configured to generate a first voltage corresponding to the level-converted control signal, and output the adjustment signal to the first signal conversion unit based on the first voltage and the second voltage.

[0013] In one or more embodiments, the control signal is a pulse width modulation signal, and the signal processing unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, an inverter, and a fifth capacitor, wherein a first end of the first resistor, a power supply end of the inverter, a first end of the fifth capacitor, and a first end of the fourth resistor are all connected to a first power supply, a second end of the first resistor is respectively connected to the first end of the second resistor and the pulse width modulation signal, a second end of the second resistor is connected to an input end of the inverter, an output end of the inverter is respectively connected to the first end of the third resistor, a second end of the third resistor is respectively connected to the second end of the fourth resistor and the signal output unit, and a second end of the fifth capacitor is connected to a second ground.

[0014] In one or more embodiments, the voltage sampling unit includes a fifth resistor, a sixth resistor, a seventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first diode, and a second diode, wherein a first end of the sixth capacitor is connected to the second signal conversion module, a second end of the sixth capacitor is connected to a first end of the fifth resistor, a first end of the seventh capacitor, and an anode of the first diode, respectively, a cathode of the first diode is connected to the first end of the sixth resistor, a second end of the sixth resistor is connected to a first end of the seventh resistor, a first end of the eighth capacitor, a cathode of the second diode, and a signal output unit, respectively, and the second end of the seventh capacitor, the second end of the fifth resistor, the second end of the eighth capacitor, the second end of the seventh resistor, and the cathode of the second diode are all connected to a second ground.

[0015] In one or more embodiments, the signal output unit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a ninth capacitor, and a tenth capacitor, and an operational amplifier. A first end of the eighth resistor is connected to the voltage sampling unit, a second end of the eighth resistor is connected to a first end of the ninth capacitor and the inverting input end of the operational amplifier, a second end of the ninth capacitor is connected to the first end of the ninth resistor, a second end of the ninth resistor is connected to the first end of the tenth resistor and the output end of the operational amplifier, and a second end of the tenth resistor is connected to the first end of the eleventh resistor and the first signal conversion module, respectively. The second end of the eleventh resistor and the first end of the tenth capacitor are both connected to a second ground, the second end of the tenth capacitor is connected to the first end of the twelfth resistor and the common-mode input end of the operational amplifier, respectively, and the second end of the twelfth resistor is connected to the signal processing unit.

[0016] In a second aspect, the present application provides an electronic device including an electrical load and a sine wave generating circuit as described above, the sine wave generating circuit being connected to the electrical load to supply power to the electrical load.

[0017] The sine wave generating circuit provided by the present application includes a first signal conversion module, a Class D amplifier, a second signal conversion module, and a voltage control module. The first signal conversion module receives a square wave signal and converts it into a first sine wave signal with adjustable amplitude. The Class D amplifier is connected to the first signal conversion module and receives the first sine wave signal, amplifies and modulates the power of the first sine wave signal, and outputs a high-frequency carrier pulse-width modulated signal. The second signal conversion module is connected to the Class D amplifier and receives the high-frequency carrier pulse-width modulated signal, demodulates and boosts the high-frequency carrier pulse-width modulated signal, and outputs a second sine wave signal. The voltage control module is connected between the second signal conversion module and the first signal conversion module and receives the second sine wave signal and the control signal. The voltage control module outputs an adjustment signal to the first signal conversion module based on the control signal and the second sine wave signal, and adjusts the amplitude of the first sine wave signal until the voltage of the control signal and the second sine wave signal meets a preset relationship. Therefore, users can adjust the control signal to adjust the amplitude of the first sine wave signal and the voltage of the second sine wave signal according to their needs. At the same time, using a Class D amplifier to generate the second sine wave signal can improve conversion efficiency and thereby enhance the reliability of the entire sine wave generation circuit. [Brief explanation of the drawings]

[0018] In one or more embodiments, the invention is illustrated through corresponding drawings, which illustrations do not constitute limitations of the embodiments, and elements having the same reference numerals indicate similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations. [Figure 1] FIG. 2 is a schematic diagram of a sine wave generating circuit configuration in an embodiment of the present application. [Figure 2] FIG. 10 is a schematic diagram of a sine wave generating circuit configuration according to a second embodiment of the present invention. [Figure 3] FIG. 2 is a schematic diagram of a sine wave generating circuit configuration in an embodiment of the present application. [Figure 4]3 is a schematic diagram of each signal in a sine wave generating circuit in an embodiment of the present application. FIG. [Figure 5] FIG. 10 is a schematic diagram of a sine wave generating circuit configuration according to a third embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram of a sine wave generating circuit configuration in an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to clarify the objectives, solutions and advantages of the embodiments of the present application, the solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0020] Referring to Figure 1, Figure 1 is a schematic diagram of a sine wave generating circuit configuration in an embodiment of the present application. As shown in Figure 1, the sine wave generating circuit (100) includes a first signal converting module (10), a class D amplifier (U1), a second signal converting module (20), and a voltage control module (30).

[0021] Here, the class D amplifier (U1) is connected to the first signal conversion module 10. The second signal conversion module (10) is connected to the class D amplifier (U1). The voltage control module (30) is connected between the second signal conversion module (20) and the first signal conversion module (10).

[0022] Specifically, the first signal conversion module (10) receives a square wave signal (VCLK), which in some embodiments is a clock signal. The first signal conversion module (10) converts the square wave signal (VCLK) into a first sine wave signal with adjustable amplitude. The class D amplifier (U1) receives the first sine wave signal. The class D amplifier (U1) amplifies and modulates the power of the first sine wave signal, and then outputs a high-frequency carrier pulse-width modulated signal with a variable duty cycle. The second signal conversion module (20) receives the high-frequency carrier pulse-width modulated signal. The second signal conversion module (20) demodulates and boosts the high-frequency carrier pulse-width modulated signal to output a second sine wave signal (VSIN2). The voltage control module (30) receives the second sine wave signal (VSIN2) and a control signal (VCO). The voltage control module (30) outputs an adjustment signal to the first signal conversion module (10) to adjust the amplitude of the first sine wave signal based on the control signal (VCO) and the second sine wave signal (VSIN2) until the voltages of the control signal (VCO) and the second sine wave signal (VSIN2) satisfy a preset relationship.

[0023] Here, the second sine wave signal (VSIN2) is used to supply power to an electrical load. For example, if the sine wave generating circuit is applied to an electronic device, the second sine wave signal (VSIN2) is used to supply power to an electrical load in the electronic device. If the electronic device is a printer, the second sine wave signal (VSIN2) can be used to supply power to an ink cartridge (i.e., an electrical load) in the printer.

[0024] The preset relationship is a predetermined correspondence relationship between the voltage of the control signal (VCO) and the voltage of the second sine wave signal (VSIN2), and can be specifically set based on an actual application scenario, and the embodiments of the present application do not impose any specific limitations thereon. For example, in some embodiments, the preset relationship can be set so that a proportional relationship is shown between the voltage of the control signal (VCO) and the voltage of the second sine wave signal (VSIN2), and in other embodiments, the proportional relationship can be set to 1:1, that is, the actual preset relationship is that the voltage of the control signal (VCO) and the voltage of the second sine wave signal (VSIN2) are equal.

[0025] In a practical application, when a user needs to adjust the voltage of the second sine wave signal (VSIN2), the control signal (VCO) is output according to the user's needs. If the voltages of the control signal (VCO) and the second sine wave signal (VSIN2) do not meet the preset relationship, the voltage control module (30) outputs a corresponding adjustment signal to the first signal conversion module (10) to adjust the amplitude of the first sine wave signal. The high-frequency carrier pulse width modulation signal and the second sine wave signal (VSIN2) are then sequentially adjusted until the voltages of the control signal (VCO) and the second sine wave signal (VSIN2) again meet the preset relationship. Therefore, the above process can automatically adjust the voltage of the second sine wave signal to meet the user's needs, i.e., output a corresponding sine wave signal according to the user's needs. At the same time, if a class D amplifier is used to generate the second sine wave signal, it can have high conversion efficiency, which can prevent devices from overheating or being damaged when the voltage changes, and is advantageous in maintaining stable operation of each device, thereby increasing the reliability of the sine wave generating circuit (10) as a whole.

[0026] In one embodiment, the first signal conversion module (10) includes a signal conversion unit (11) and a signal amplification unit (12), as shown in Figure 2. Here, the signal amplification unit (12) is connected to the signal conversion unit (11).

[0027] Specifically, a square wave signal is input to the signal conversion unit 11. The signal conversion unit 11 converts the square wave signal into a third sine wave signal. The signal amplification unit 12 receives the third sine wave signal. The signal amplification unit 12 outputs a first sine wave signal based on the third sine wave signal.

[0028] Here, the amplitude of the first sine wave signal is determined by the amplitude of the third sine wave signal and the gain of the signal amplification unit. Specifically, the amplitude of the first sine wave signal is the product of the amplitude of the third sine wave signal and the gain of the signal amplification unit (12). Meanwhile, the gain of the signal amplification unit (12) is determined by the magnitude of the voltage of the adjustment signal output by the voltage control module (30). Therefore, by changing the magnitude of the voltage of the adjustment signal, the gain of the signal amplification unit (12) can be changed. Furthermore, when the amplitude of the third sine wave signal does not change, the amplitude of the first sine wave signal can be changed. In other words, the amplitude of the first sine wave signal is adjustable and can be adjusted by the adjustment signal.

[0029] In this embodiment, the class D amplifier (U1) has a single-ended output. The second signal conversion module (20) includes a first filter unit (21) and a first boost unit (22). Here, the first filter unit (21) is connected between the class D amplifier (U1) and the first boost unit (22).

[0030] Specifically, the first filtering unit 21 filters the high-frequency carrier pulse-width modulated signal to demodulate it. The first boost unit 22 boosts the demodulated high-frequency carrier pulse-width modulated signal to output a second sine wave signal. That is, the Class D amplifier U1 outputs the high-frequency carrier pulse-width modulated signal, which is filtered by the first filtering unit 21 (where it is demodulated back to a sine wave) and boosted by the first boost unit 22, becoming the second sine wave signal VSIN2. As a result, the second sine wave signal VSIN2 obtained through the power amplification of the Class D amplifier U1 and the boosting of the first boost unit 22 can meet application scenarios requiring high-power and high-voltage power supplies. Here, in the present embodiment, the second sine wave signal VSIN2 refers to a high-voltage sine wave, typically a voltage of 1000V or more.

[0031] In one embodiment, the voltage control module 30 includes a signal processing unit 31, a voltage sampling unit 32, and a signal output unit 32. The signal processing unit 31 is connected to the signal output unit 32. The voltage sampling unit 31 is connected between the second signal conversion module 20 and the signal output unit 32. The signal output unit 32 is connected to the first signal conversion module 10.

[0032] Specifically, the signal processing unit 31 receives a control signal (VCO). The signal processing unit 31 outputs the control signal (VCO), converts its level, and outputs the converted signal to the signal output unit 32. The voltage sampling unit 32 samples a second sine wave signal and outputs a second voltage corresponding to the second sine wave signal to the signal output unit 32. The signal output unit 32 generates a first voltage corresponding to the level-converted control signal (VCO), and outputs an adjustment signal to the first signal conversion module 10 based on the first and second voltages. Here, the signal output unit 32 outputs the adjustment signal to the first signal conversion module 10 to adjust the amplitude of the first sine wave signal until the first and second voltages satisfy a preset relationship. In some embodiments, the preset relationship satisfied by the first and second voltages is that the first and second voltages are equal to each other. When a user needs to obtain a second voltage of a certain voltage value, it is convenient because it is sufficient to output only the control signal (VCO) corresponding to that voltage value. Here, the control signal (VCO) may be a signal that can be converted to an arbitrary voltage (for example, a pulse width modulation (PWM) signal).

[0033] Referring to FIG. 3, FIG. 3 illustrates a circuit configuration corresponding to the configuration shown in FIG.

[0034] In one embodiment, as shown in FIG. 3, the signal transformation unit (11) includes a square wave to sine wave module (U2).

[0035] Here, the square wave signal (VCLK) is input to the input terminal (INPUT) of the square wave conversion sine wave module (U2), and the third sine wave signal is output from the output terminal (OUT). The power supply terminal (VCC) of the square wave conversion sine wave module (U2) is connected to the input power supply (VIN) via a fuse (F1), and power is supplied from the input power supply (VIN). The square wave signal (VCLK) has the same frequency as the third sine wave signal. In some embodiments, the square wave conversion sine wave module (U2) can use a module model such as RT8H415C.

[0036] In one embodiment, the signal amplification unit (12) includes a sine wave amplification module (U3).

[0037] The input terminal (SIN) of the sine wave amplifier module (U3) receives the third sine wave signal, and the output terminal (OUT) outputs the first sine wave signal. The power supply terminal (VCC) of the sine wave amplifier module (U3) is connected to the input power supply (VIN) via a fuse (F1), and power is supplied from the input power supply (VIN).

[0038] In one embodiment, the input terminal (RIN) of the class D amplifier (U1) receives a third sine wave signal, and the output terminal (ROUT) outputs a high frequency carrier pulse width modulated signal. The power supply terminal (VCC) of the class D amplifier (U1) is connected to the input power supply (VIN) via a fuse (F1) and is supplied with power from the input power supply (VIN).

[0039] In one embodiment, the first filter unit (21) includes a first inductor (L1), a first capacitor (C1) and a second capacitor (C2), and the first boost unit (22) includes a first transformer (T1).

[0040] Here, a first end of the first inductance (L1) is connected to the class D amplifier (U1), a second end of the first inductance (L1) is connected to a first end of the first capacitor (C1) and a first end of the second capacitor (C2), respectively, a second end of the first capacitor (C1) is connected to a first end of the primary winding of the first transformer (T1), and a second end of the second capacitor (C2), a second end of the secondary winding of the first transformer (T1), and a second end of the second transformer (T1). Here, in the embodiment of the present application, the first ground (PG) is the ground of the circuit that transmits power, and the second ground (SG) is the ground of the circuit that transmits signals.

[0041] Specifically, the first inductor (L1), the first capacitor (C1) and the second capacitor (C2) are a low-pass filtering combination, which realizes demodulation of the high-frequency carrier pulse width modulated signal into a fourth sine wave signal.

[0042] In one embodiment, the control signal is a pulse width modulated signal. The signal processing unit (31) includes a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), an inverter (NO1), and a fifth capacitor (C5).

[0043] Here, the first end of the first resistor (R1), the power supply end of the inverter (NO1), the first end of the fifth capacitor (C5) and the first end of the fourth resistor (R4) are all connected to the first power supply V1, the second end of the first resistor (R1) is connected to the first end of the second resistor (R2) and the pulse width modulation signal, respectively, the second end of the second resistor (R2) is connected to the input end of the inverter (NO1), the output end of the inverter (NO1) is connected to the first end of the third resistor (R3), the second end of the third resistor (R3) is connected to the second end of the fourth resistor (R4) and the signal output unit 32, respectively, and the fifth end of the fifth capacitor (C5) is connected to the second ground (SG).

[0044] Specifically, the first resistor R1 is a pull-up resistor, and the second resistor R2 is an input protection resistor. The inverter NO1 can process the pulse-width modulated signal with an inverse duty cycle. The third resistor R3 and the fourth resistor R4 are voltage-dividing resistors. The provision of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the inverter NO1 corresponds to a process of level-converting the pulse-width modulated signal, which can improve the interference resistance of the pulse-width modulated signal and prevent interference from affecting subsequent control processes, thereby improving the stability and reliability of the overall operation of the sine wave generating circuit 10.

[0045] In one embodiment, the voltage sampling unit (32) includes a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a sixth capacitor (C6), a seventh capacitor (C7), an eighth capacitor (C8), a first diode (D1) and a second diode capacitor (D2).

[0046] Here, the first end of the sixth capacitor (C6) is connected to the second signal conversion module (20), the second end of the sixth capacitor (C6) is connected to the first end of the fifth resistor (R5), the first end of the seventh capacitor (C7) and the anode of the first diode (D1), respectively, the cathode of the first diode (D1) is connected to the first end of the sixth resistor (R6), the second end of the sixth resistor (R6) is connected to the first end of the seventh resistor (R7), the first end of the eighth capacitor (C8), the cathode of the second diode capacitor (D2) and the signal output unit 32, respectively, and the second end of the seventh capacitor (C7), the second end of the fifth resistor (R5), the second end of the eighth capacitor (C8), the second end of the seventh resistor (R7) and the cathode of the second diode capacitor (D2) are all connected to the second ground (SG).

[0047] Specifically, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the fifth resistor R5 are used for filtering. The first diode D1 is used for rectification. The sixth resistor R6 and the seventh resistor R7 are used for voltage division. The second diode capacitor D2 is used to filter any negative voltage that may be generated. Through the filtering and rectification process, the second sine wave signal VSIN2 can be converted into a specific voltage value (i.e., the second voltage).

[0048] In one embodiment, the signal output unit (33) includes an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a ninth capacitor (C9), a tenth capacitor (C10), and an operational amplifier (U4).

[0049] Here, the first end of the eighth resistor (R8) is connected to the voltage sampling unit (32), the second end of the eighth resistor (R8) is connected to the first end of the ninth capacitor (C9) and the inverting input end of the operational amplifier (U4), the second end of the ninth capacitor (C9) is connected to the first end of the ninth resistor (R9), the second end of the ninth resistor (R9) is connected to the first end of the tenth resistor (R10) and the output end of the operational amplifier (U4), and the second end of the tenth resistor (R10) is connected to the first end of the tenth resistor (R11). The first end of the resistor R1 and the first end of the tenth capacitor C10 are connected to the second ground (SG), the second end of the tenth capacitor C10 is connected to the first end of the resistor R1 and the common-phase input terminal of the operational amplifier U4, and the second end of the resistor R1 is connected to the signal processing unit 31.

[0050] Specifically, the twelfth resistor (R12) and the tenth capacitor (C10) perform an integration function to convert the level-shifted control signal (VCO) into a first voltage. The eighth resistor (R8) protects the operational amplifier (U4). The ninth resistor (R9) and the ninth capacitor (C9) perform a feedback function. The tenth resistor (R10) and the eleventh resistor (R11) divide the voltage to output the appropriate voltage to the feedback input (VCCON) of the sine wave amplifier module (U3).

[0051] In this embodiment, the first voltage is input to the in-phase input terminal of the operational amplifier U4, and the second voltage is input to the inverting input terminal of the operational amplifier U4. If the first voltage and the second voltage are not equal, the voltage output from the operational amplifier U4 is divided by the tenth resistor R10 and the eleventh resistor R1 (corresponding to the adjustment signal in the previous embodiment) and then input to the feedback input terminal (VCCON) of the sine wave amplifier module U3. This adjusts the gain of the sine wave amplifier module U3 to adjust the second sine wave signal (VSIN2), thereby adjusting the magnitude of the second voltage. The difference between the second voltage and the first voltage is gradually reduced. Until the first voltage and the second voltage are equal, the entire system is stable and the gain of the sine wave amplifier module U3 remains unchanged.

[0052] 4 is a schematic diagram illustrating signals in the sine wave generating circuit (10) shown in FIG. 3 according to one embodiment. Here, the horizontal axis represents time. The signals in the vertical direction, from top to bottom, are the square wave signal (VCLK), the first sine wave signal (VSIN1) output from the square wave conversion sine wave module (U2), the high frequency carrier pulse width modulation signal (VSPWM) output from the class D amplifier (U1), the fourth sine wave signal (VSIN4) output from the first filter unit (21), and the second sine wave signal (VSIN2) output from the first boost unit (22).

[0053] As shown in FIG. 4, the square wave signal (VCLK) is input to the square wave conversion sine wave module (U2) and converted into a first sine wave signal (VSIN1). The first sine wave signal (VSIN1) is input to the sine wave amplification module (U3), which outputs a third sine wave signal (VSIN3). In this embodiment, assuming that the gain of the sine wave amplification module (U3) is 1 when the entire sine wave generation circuit (10) is stable and operating, the third sine wave signal (VSIN3) is the same as the first sine wave signal (VSIN1). This is equivalent to inputting the first sine wave signal (VSIN1) into the Class D amplifier (U1). The Class D amplifier (U1) outputs a high-frequency carrier pulse-width modulated signal (VSPWM) after power amplification and modulation. The high-frequency carrier pulse width modulation signal (VSPWM) is input to the first filter unit (21), filtered, and converted into a fourth sine wave signal (VSIN4). Through power amplification, the driving capability of the fourth sine wave signal (VSIN4) is stronger than that of the third sine wave signal (VSIN3) and the first sine wave signal (VSIN1). Finally, the fourth sine wave signal (VSIN4) is input to the first transformer (T1) and boosted to obtain a second sine wave signal (VSIN2). The second sine wave signal (VSIN2) is a high-voltage sine wave with high driving capability.

[0054] It should be understood that the hardware configuration of the sine wave generating circuit 10 shown in FIGS. 2 and 3 is illustrative only, and that the sine wave generating circuit 10 may have more or fewer components than those shown, may combine two or more components, or may have a different component configuration, and that the various components shown in the figures may be implemented through hardware, software, or a combination of hardware and software, including one or more signal processing and / or dedicated integrated circuits.

[0055] For example, while Figures 2 and 3 employ single-ended Class D amplifiers, alternative embodiments may employ differential Class D amplifiers, where the output signals of the single-ended Class D amplifiers are all referenced to a common ground, while each output signal of the differential Class D amplifier has its own reference ground.

[0056] 5, when a differential output class D amplifier is used, the second signal conversion module 20 includes a second filter unit 23, a third filter unit 24, and a second boost unit 25. Here, the second filter unit 23 and the third filter unit 24 are both connected between the class D amplifier U1 and the second boost unit 25.

[0057] Specifically, the second filter unit 23 and the third filter unit 24 filter the high frequency carrier pulse width modulated signal to demodulate the high frequency carrier pulse width modulated signal. The second boost unit 25 boosts the demodulated high frequency carrier pulse width modulated signal to output the second sine wave signal (VSIN2). For specific implementation processes, please refer to the detailed description of the first filter unit 21 and the first boost unit 22, and further description will not be given here.

[0058] Fig. 6 also illustrates a circuit configuration corresponding to Fig. 5. Here, for the parts of the circuit configuration shown in Fig. 6 that are the same as the circuit configuration shown in Fig. 3, the description of Fig. 3 can be referred to, and no further description will be given here.

[0059] As shown in FIG. 6, the second filter unit (23) includes a third capacitor (C3) and a second inductance (L2), the third filter unit (24) includes a fourth capacitor (C4) and a third inductance (L3), and the second boost unit (25) includes a second transformer (T2).

[0060] Here, a first terminal of the second inductance (L2) is connected to the in-phase output terminal of the class D amplifier (U1), a second terminal of the second inductance (L2) is connected to a first terminal of the third capacitor (C3) and a first terminal of the primary winding of the second transformer (T2), a first terminal of the third inductance L3 is connected to the in-phase output terminal of the class D amplifier (U1), a second terminal of the third inductance L3 is connected to a first terminal of the fourth capacitor (C4) and a second terminal of the primary winding of the second transformer (T2), the second terminal of the third capacitor (C3), the second terminal of the fourth capacitor (C4) and the second terminal of the secondary winding of the second transformer (T2) are connected to the first ground (PG), and the first terminal of the secondary winding of the second transformer (T2) outputs a second sine wave signal (VSIN2).

[0061] Specifically, the third capacitor (C3) and the second inductor (L2) form a low-pass filtering combination, and the fourth capacitor (C4) and the third inductor (L3) also form a low-pass filtering combination, which can demodulate the high-frequency carrier pulse width modulated signal into a fourth sine wave signal.

[0062] Also provided are embodiments of an electronic device including an electrical load and a sine wave generating circuit (100) according to any of the embodiments of the present disclosure, wherein the sine wave generating circuit (100) is connected to the electrical load to supply power to the electrical load.

[0063] Finally, the above embodiments are used only to illustrate the solutions of the present application and are not intended to be limiting. Based on the spirit of the present application, technical features in the above embodiments or different embodiments can be combined, steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not described in the detailed description for the sake of clarity. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may modify the solutions described in each embodiment or substitute some of the technical features with equivalents, and these modifications or substitutions do not deviate from the essence of the corresponding solutions and the scope of the solutions of each embodiment of the present invention.

Claims

1. a first signal conversion module for inputting a square wave signal and converting the square wave signal into a first sine wave signal whose amplitude is adjustable; a class D amplifier connected to the first signal conversion module, for receiving the first sine wave signal, amplifying and modulating the first sine wave signal, and outputting a high frequency carrier pulse width modulated signal; a second signal conversion module connected to the class D amplifier, for receiving the high-frequency carrier pulse width modulation signal, demodulating and boosting the high-frequency carrier pulse width modulation signal, and outputting a second sine wave signal; a voltage control module connected between the second signal conversion module and the first signal conversion module, for inputting the second sine wave signal and a control signal, and outputting an adjustment signal to the first signal conversion module based on the control signal and the second sine wave signal to adjust the amplitude of the first sine wave signal until a voltage between the control signal and the second sine wave signal satisfies a preset relationship.

2. the first signal converting module includes a signal converting unit and a signal amplifying unit; the signal converting unit is for inputting the square wave signal and converting the square wave signal into a third sine wave signal; 2. The sine wave generating circuit of claim 1, wherein the signal amplifying unit is connected to the signal converting unit and receives the third sine wave signal as an input, and the signal converting unit is configured to output the first sine wave signal based on the third sine wave signal, wherein the amplitude of the first sine wave signal is determined by the amplitude of the third sine wave signal and a gain of the signal amplifying unit.

3. When the class D amplifier has a single-ended output, the second signal conversion module includes a first filter unit and a first boost unit; the first filter unit is connected between the class D amplifier and the first boost unit and configured to filter the high frequency carrier pulse width modulated signal so as to demodulate the high frequency carrier pulse width modulated signal; 2. The sine wave generating circuit according to claim 1, wherein the first boosting unit boosts a signal obtained by demodulating the high-frequency carrier pulse width modulated signal to output the second sine wave signal.

4. the first filter unit includes a first inductor, a first capacitor, and a second capacitor; the first boost unit includes a first transformer; 4. The sine wave generating circuit of claim 3, wherein a first end of the first inductance is connected to the class D amplifier, a second end of the first inductance is connected to a first end of the first capacitor and a first end of the second capacitor, respectively, a second end of the first capacitor is connected to a first end of a primary winding of the first transformer, a second end of the second capacitor, a second end of the primary winding of the first transformer, and a second end of the secondary winding of the first transformer are all connected to a first ground, and a first end of the secondary winding of the first transformer outputs the second sine wave signal.

5. When the class D amplifier has a differential output, the second signal conversion module includes a second filter unit, a third filter unit, and a second boost unit; the second filter unit and the third filter unit are both connected between the class D amplifier and the second boost unit, and are configured to filter the high-frequency carrier pulse-width modulated signal so as to demodulate the high-frequency carrier pulse-width modulated signal; 2. The sine wave generating circuit according to claim 1, wherein the second boosting unit boosts a signal obtained by demodulating the high-frequency carrier pulse width modulated signal to output the second sine wave signal.

6. the second filter unit includes a third capacitor and a second inductance; the third filter unit includes a fourth capacitor and a third inductance; the second step-up unit includes a second transformer; 6. The sine wave generating circuit of claim 5, wherein a first end of the second inductance is connected to an in-phase output terminal of the class D amplifier, a second end of the second inductance is connected to a first end of the third capacitor and a first end of a primary winding of the second transformer, respectively, a first end of the third inductance is connected to an in-phase output terminal of the class D amplifier, a second end of the third inductance is connected to a first end of the fourth capacitor and a second end of the primary winding of the second transformer, respectively, a second end of the third capacitor, a second end of the fourth capacitor, and a second end of the secondary winding of the second transformer are connected to a first ground, and a first end of the secondary winding of the second transformer outputs the second sine wave signal.

7. The voltage control module includes a signal processing unit, a voltage sampling unit and a signal output unit; the signal processing unit is connected to the signal output unit, and is configured to receive the control signal, convert the level of the control signal, and output the converted level to the signal output unit; the voltage sampling unit is connected between the second signal conversion module and the signal output unit, and is configured to sample the second sine wave signal and output a second voltage corresponding to the second sine wave signal to the signal output unit; 2. The sine wave generating circuit according to claim 1, wherein the signal output unit is connected to the first signal conversion module, configured to generate a first voltage corresponding to the control signal after level conversion, and output the adjusted signal to the first signal conversion module based on the first voltage and the second voltage.

8. the control signal is a pulse width modulation signal, and the signal processing unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, an inverter, and a fifth capacitor; 8. The sine wave generating circuit of claim 7, wherein the first end of the first resistor, the power supply end of the inverter, the first end of the fifth capacitor, and the first end of the fourth resistor are all connected to a first power supply, the second end of the first resistor is connected to the first end of the second resistor and the pulse width modulation signal, respectively, the second end of the second resistor is connected to the input end of the inverter, the output end of the inverter is connected to the first end of the third resistor, the second end of the third resistor is connected to the second end of the fourth resistor and the signal output unit, respectively, and the second end of the fifth capacitor is connected to a second ground.

9. the voltage sampling unit includes a fifth resistor, a sixth resistor, a seventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first diode, and a second diode; 8. The sine wave generating circuit of claim 7, wherein a first end of the sixth capacitor is connected to the second signal conversion module, a second end of the sixth capacitor is connected to a first end of the fifth resistor, a first end of the seventh capacitor, and an anode of the first diode, respectively, a cathode of the first diode is connected to the first end of the sixth resistor, a second end of the sixth resistor is connected to the first end of the seventh resistor, a first end of the eighth capacitor, a cathode of the second diode, and a signal output unit, respectively, and a second end of the seventh capacitor, a second end of the fifth resistor, a second end of the eighth capacitor, a second end of the seventh resistor, and a cathode of the second diode are all connected to a second ground.

10. the signal output unit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a ninth capacitor, a tenth capacitor, and an operational amplifier; 8. The sine wave generating circuit of claim 7, wherein a first end of the eighth resistor is connected to the voltage sampling unit, a second end of the eighth resistor is connected to a first end of the ninth capacitor and an inverting input end of the operational amplifier, a second end of the ninth capacitor is connected to the first end of the ninth resistor, a second end of the ninth resistor is connected to a first end of the tenth resistor and an output end of the operational amplifier, a second end of the tenth resistor is connected to a first end of the eleventh resistor and the first signal converting module, a second end of the eleventh resistor and a first end of the tenth capacitor are both connected to a second ground, a second end of the tenth capacitor is connected to a first end of the twelfth resistor and a common-mode input end of the operational amplifier, and a second end of the twelfth resistor is connected to the signal processing unit.

11. An electric load and the sine wave generating circuit according to any one of claims 1 to 10, The electronic device is characterized in that the sine wave generating circuit is connected to the electrical load to supply power to the electrical load.

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