Power supply, electronic equipment and measuring system

Abstract

The utility model discloses a power supply, electronic equipment and a measurement system, and belongs to the technical field of power supplies. The first conversion circuit converts the first digital signal to output a first trapezoidal wave; the second conversion circuit converts the second digital signal to output a second trapezoidal wave, and the first trapezoidal wave and the second trapezoidal wave have the same polarity and are not overlapped with each other; the booster circuit boosts the voltage difference between the first trapezoidal wave and the second trapezoidal wave so as to output alternating current; the rectifying and filtering circuit rectifies and filters the alternating current to output first direct current; therefore, conducted interference, radiated interference and beat frequency of the rectified and filtered direct current on the high-precision instruments and meters are reduced, and the output stability and accuracy of the high-precision instruments and meters are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of power supply, and in particular, relates to a power supply, an electronic device and a measurement system. Background Art

[0002] The relevant high-precision instruments are powered by linear power supplies or switching power supplies. However, both switching power supplies and linear power supplies use low-voltage power grids as input for voltage conversion. The power supply frequency of the power grid is generally 50Hz or 60Hz, so the converted DC signal will contain 50Hz or 60Hz AC pulsation, which will be partially superimposed on the measurement or output signal. Since many high-precision instruments measure and output the voltage, current, and power of the power grid, the output of high-precision instruments superimposed on the interference signal of the power frequency will produce beat frequency, resulting in a decrease in the output stability and accuracy of the high-precision instruments. Utility Model Content

[0003] The purpose of the present application is to provide a power supply and an electronic device, aiming to solve the problem that the relevant power supply is powered by a linear power supply or a switching power supply, which leads to a decrease in the output stability and accuracy of high-precision instruments.

[0004] The present application provides a power supply, including:

[0005] a control circuit configured to output a first digital signal and a second digital signal;

[0006] a first conversion circuit, connected to the control circuit, configured to convert the first digital signal to output a first trapezoidal wave;

[0007] a second conversion circuit connected to the control circuit and configured to convert the second digital signal to output a second trapezoidal wave, wherein the first trapezoidal wave and the second trapezoidal wave have the same polarity and do not overlap each other;

[0008] a boost circuit connected to the first conversion circuit and the second conversion circuit, and configured to boost the voltage difference between the first trapezoidal wave and the second trapezoidal wave to output alternating current;

[0009] The rectifying and filtering circuit is connected to the boosting circuit and is configured to rectify and filter the alternating current to output a first direct current.

[0010] In one embodiment, the power supply further comprises:

[0011] The energy storage circuit is configured to output a second direct current to power each functional module.

[0012] In one embodiment, the first conversion circuit includes:

[0013] a first digital-to-analog conversion circuit connected to the control circuit and the energy storage circuit, and configured to perform digital-to-analog conversion on the first digital signal based on the second direct current to output a third trapezoidal wave;

[0014] The first power amplifier circuit is connected to the first digital-to-analog conversion circuit and the boost circuit, and is configured to amplify the current of the third trapezoidal wave to output the first trapezoidal wave.

[0015] In one embodiment, the first digital-to-analog conversion circuit includes:

[0016] a first reference voltage module, connected to the energy storage circuit, and configured to perform voltage conversion on the second direct current to output a first reference voltage;

[0017] A first digital-to-analog conversion module is connected to the first reference voltage module, the control circuit and the first power amplifier circuit, and is configured to perform digital-to-analog conversion on the first digital signal based on the first reference voltage to output a fifth trapezoidal wave;

[0018] The first amplifying module is connected to the first digital-to-analog conversion module and is configured to amplify the fifth trapezoidal wave to output the third trapezoidal wave.

[0019] In one of the embodiments, the first digital-to-analog conversion module includes a first digital-to-analog converter;

[0020] The reference voltage input terminal of the first digital-to-analog converter serves as the first reference voltage input terminal of the first digital-to-analog conversion module, and is connected to the first reference voltage module to input the first reference voltage; the serial data signal input terminal of the first digital-to-analog converter serves as the first digital signal input terminal of the first digital-to-analog converter, and is connected to the control circuit to input the first digital signal; the analog output voltage terminal of the first digital-to-analog converter serves as the fifth trapezoidal wave output terminal of the first digital-to-analog conversion module, and is connected to the first amplification module to output the fifth trapezoidal wave.

[0021] In one embodiment, the second conversion circuit includes:

[0022] a second digital-to-analog conversion circuit connected to the control circuit and the energy storage circuit, and configured to perform digital-to-analog conversion on the second digital signal based on the second direct current to output a fourth trapezoidal wave;

[0023] The second power amplifier circuit is connected to the second digital-to-analog conversion circuit and the boost circuit, and is configured to amplify the current of the fourth trapezoidal wave to output the second trapezoidal wave.

[0024] In one embodiment, the second digital-to-analog conversion circuit includes:

[0025] a second reference voltage module, connected to the energy storage circuit, and configured to perform voltage conversion on the second direct current to output a second reference voltage;

[0026] A second digital-to-analog conversion module, connected to the second reference voltage module and the control circuit, configured to perform digital-to-analog conversion on the second digital signal based on the second reference voltage to output a sixth trapezoidal wave;

[0027] The second amplifying module is connected to the second digital-to-analog conversion module and the second power amplifying circuit, and is configured to amplify the sixth trapezoidal wave to output the fourth trapezoidal wave.

[0028] In one embodiment, the power supply further comprises:

[0029] An input circuit, connected to the control circuit and configured to output a frequency modulation signal according to the operation;

[0030] The control circuit is specifically configured to output the first digital signal, the second digital signal and a display signal according to the frequency modulation signal;

[0031] The display circuit is connected to the control circuit and is configured to display according to the display signal.

[0032] An embodiment of the present application further provides an electronic device, which includes the above-mentioned power supply.

[0033] The embodiment of the present application also provides a measurement system, the measurement system comprising a measurement device and the above-mentioned power supply;

[0034] The frequency of the first trapezoidal wave and the frequency of the second trapezoidal wave are integer multiples of the frequency of the input signal of the measuring device or integer multiples of the frequency of the output signal of the measuring device.

[0035] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the voltage difference between the first trapezoidal wave and the second trapezoidal wave is boosted by a boost circuit to output alternating current, thereby ensuring that the frequency of the pulsating alternating current signal and the signal frequency of the input or output of the high-precision instrument are not orthogonal, reducing the beat frequency of the rectified and filtered direct current on the high-precision instrument, thereby improving the stability and accuracy of the output of the high-precision instrument; and the first conversion circuit converts the first digital signal to output a first trapezoidal wave, and the second conversion circuit converts the second digital signal to output a second trapezoidal wave, thereby realizing the use of a trapezoidal wave as the input voltage of the boost circuit, ensuring the slow rise and fall of the input voltage of the boost circuit, reducing the possibility of large impact current and excitation surge current, and reducing the possibility of damage to circuit components caused by short-term overcurrent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of a structure of a power supply provided in an embodiment of the present application;

[0038] Figure 2 A waveform diagram of a trapezoidal wave provided in an embodiment of the present application;

[0039] Figure 3 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0040] Figure 4 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0041] Figure 5 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0042] Figure 6 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0043] Figure 7 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0044] Figure 8 Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0045] Fig. 9Another structural schematic diagram of a power supply provided in an embodiment of the present application;

[0046] Fig.10 A partial exemplary circuit schematic diagram of a power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] Figure 1 The following is a schematic diagram of the structure of a power supply provided by an embodiment of the present application. For ease of explanation, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0052] The power supply includes a control circuit 100 , a first conversion circuit 200 , a second conversion circuit 300 , a boost circuit 400 and a rectifier and filter circuit 500 .

[0053] The control circuit 100 is configured to output a first digital signal and a second digital signal.

[0054] The first conversion circuit 200 is connected to the control circuit 100 and is configured to convert the first digital signal to output a first trapezoidal wave U1.

[0055] The second conversion circuit 300 is connected to the control circuit 100 and is configured to convert the second digital signal to output a second trapezoidal wave U2, wherein the first trapezoidal wave U1 and the second trapezoidal wave U2 have the same polarity and do not overlap each other.

[0056] The boost circuit 400 is connected to the first conversion circuit 200 and the second conversion circuit 300 , and is configured to boost the voltage difference between the first trapezoidal wave U1 and the second trapezoidal wave U2 to output alternating current.

[0057] The rectifying and filtering circuit 500 is connected to the boosting circuit 400 and is configured to rectify and filter the alternating current to output a first direct current VOUT.

[0058] Specifically, the dynamic random access memory of the control circuit 100 stores 16 bits of digital trapezoidal wave information, the first digital signal and the second digital signal carry the digital trapezoidal wave information, and the first conversion circuit 200 and the second conversion circuit 300 convert the digital trapezoidal wave information into an analog trapezoidal wave through cyclic direct memory access (DMA), thereby realizing the output of the first trapezoidal wave U1 and the second trapezoidal wave U2.

[0059] In a specific implementation, the voltage difference between the first trapezoidal wave U1 and the second trapezoidal wave U2 may be less than or equal to a preset value. In some embodiments, the preset value is 0.

[0060] In the specific implementation, Figure 2 As shown in a in FIG. 1 , the output waveform of the first trapezoidal wave U1 can be a unipolar trapezoidal waveform, such as Figure 2 As shown in b in FIG. 1 , the output waveform of the second trapezoidal wave U2 can be symmetrical with the first trapezoidal wave U1, as shown in FIG. Figure 2 As shown in c, the voltage difference between the first trapezoidal wave U1 and the second trapezoidal wave U2 can be a bipolar trapezoidal wave. After the bipolar trapezoidal wave is boosted and rectified, a third direct current is obtained, such as Figure 2 As shown in d in FIG. 1 , the third DC waveform may be two continuous trapezoidal waves. After filtering the third DC, the first DC VOUT is obtained. Figure 2 As shown in FIG. 5 e, the first DC output ripple VOUT is extremely small. It can be understood that the duty cycle of the trapezoidal wave can be set to 99%, and its main energy is a flat DC signal, so the ripple coefficient after rectification is very small.

[0061] The voltage difference between the first trapezoidal wave U1 and the second trapezoidal wave U2 is boosted by the boost circuit 400 to output alternating current, ensuring that the frequency of the pulsating alternating current signal and the signal frequency of the input or output of the high-precision instrument are not orthogonal, reducing the beat frequency of the rectified and filtered direct current on the high-precision instrument, thereby improving the stability and accuracy of the output of the high-precision instrument; and the first conversion circuit 200 converts the first digital signal to output the first trapezoidal wave U1, and the second conversion circuit 300 converts the second digital signal to output the second trapezoidal wave U2, realizing the use of the trapezoidal wave as the input voltage of the boost circuit 400, ensuring the slow rise and fall of the input voltage of the boost circuit 400, reducing the possibility of large impact current and excitation surge current, and reducing the possibility of damage to circuit components caused by short-term overcurrent.

[0062] By way of example and not limitation, Figure 3 As shown, the power supply also includes an energy storage circuit 600 configured to output a second direct current to power each functional module.

[0063] The energy storage circuit 600 may include a battery. In a specific implementation, the battery may be a 12V, 8Ah lithium-ion battery.

[0064] The battery can be charged via a socket when the power supply is not in use.

[0065] Linear power supplies or switching power supplies powered directly by the power grid will introduce 50Hz or 60Hz conducted interference and radiated interference, affecting the measurement or output signal, causing the measurement or output error to become larger. Using batteries to power each functional module can achieve only spatially distributed capacitance coupling between the power supply and the ground, and the coupling to the ground and the power grid can be basically ignored, ensuring that the current leakage of the first DC power VOUT to the ground is minimized. Its conducted interference and radiated interference can be ignored compared to linear power supplies and switching power supplies, thereby further improving the stability and accuracy of high-precision instrumentation measurement or output.

[0066] Since the chip power supply voltage in each functional module is low, the battery cannot directly power the chip, so the energy storage circuit 600 can also include a low voltage difference linear regulator, which converts the battery output voltage and outputs a chip adaptation voltage, so that the energy storage circuit 600 can power the chip, expand the power output range of the energy storage circuit 600, and improve the practicality of the energy storage circuit 600.

[0067] By way of example and not limitation, Figure 4 As shown, the first conversion circuit 200 includes a first digital-to-analog conversion circuit 210 and a first power amplifier circuit 220 .

[0068] The first digital-to-analog conversion circuit 210 is connected to the control circuit 100 and the energy storage circuit 600, and is configured to perform digital-to-analog conversion on the first digital signal based on the second direct current to output a third trapezoidal wave.

[0069] The first power amplifier circuit 220 is connected to the first digital-to-analog conversion circuit 210 and the boost circuit 400 , and is configured to amplify the current of the third trapezoidal wave to output the first trapezoidal wave U1 .

[0070] The current of the third trapezoidal wave is amplified by the first power amplifier circuit 220 , thereby amplifying the power of the third trapezoidal wave, thereby improving the load capacity of the first conversion circuit 200 .

[0071] By way of example and not limitation, Figure 5 As shown, the first digital-to-analog conversion circuit 210 includes a first reference voltage module 211 , a first digital-to-analog conversion module 212 and a first amplification module 213 .

[0072] The first reference voltage module 211 is connected to the energy storage circuit 600 and is configured to perform voltage conversion on the second direct current to output a first reference voltage.

[0073] The first digital-to-analog conversion module 212 is connected to the first reference voltage module 211 , the control circuit 100 and the first power amplifier circuit 220 , and is configured to perform digital-to-analog conversion on the first digital signal based on the first reference voltage to output a fifth trapezoidal wave.

[0074] The first amplifying module 213 is connected to the first digital-to-analog converting module 212 and is configured to amplify the fifth trapezoidal wave to output a third trapezoidal wave.

[0075] The first reference voltage module 211 provides an accurate reference voltage for the first digital-to-analog conversion module 212, thereby ensuring the accuracy and stability of signal conversion.

[0076] By way of example and not limitation, Figure 6 As shown, the second conversion circuit 300 includes a second digital-to-analog conversion circuit 310 and a second power amplifier circuit 320 .

[0077] The second digital-to-analog conversion circuit 310 is connected to the control circuit 100 and the energy storage circuit 600, and is configured to perform digital-to-analog conversion on the second digital signal based on the second direct current to output a fourth trapezoidal wave.

[0078] The second power amplifier circuit 320 is connected to the second digital-to-analog conversion circuit 310 and the boost circuit 400 , and is configured to amplify the current of the fourth trapezoidal wave to output a second trapezoidal wave U2 .

[0079] The current of the fourth trapezoidal wave is amplified by the second power amplifier circuit 320 , thereby amplifying the power of the fourth trapezoidal wave, thereby improving the load capacity of the first conversion circuit 200 .

[0080] By way of example and not limitation, Figure 7 As shown, the second digital-to-analog conversion circuit 310 includes a second reference voltage module 311 , a second digital-to-analog conversion module 312 and a second amplification module 313 .

[0081] The second reference voltage module 311 is connected to the energy storage circuit 600 and is configured to perform voltage conversion on the second direct current to output a second reference voltage.

[0082] The second digital-to-analog conversion module 312 is connected to the second reference voltage module 311 and the control circuit 100 , and is configured to perform digital-to-analog conversion on the second digital signal based on the second reference voltage to output a sixth trapezoidal wave.

[0083] The second amplifying module 313 is connected to the second digital-to-analog conversion module 312 and the second power amplifying circuit 320 , and is configured to amplify the sixth trapezoidal wave to output a fourth trapezoidal wave.

[0084] The second reference voltage module 311 provides a precise reference voltage for the second digital-to-analog conversion module 312 , thereby ensuring the accuracy and stability of signal conversion.

[0085] By way of example and not limitation, Figure 8 As shown, the power supply further includes an input circuit 700 connected to the control circuit 100 and configured to output a frequency modulation signal according to the operation.

[0086] The control circuit 100 is specifically configured to output a first digital signal and a second digital signal according to the frequency modulation signal.

[0087] The input circuit 700 may be a keyboard.

[0088] The signal frequency of the trapezoidal wave can be dynamically modulated through the input circuit 700. The frequency of the trapezoidal wave can be an integer multiple of the measurement input or signal output frequency of the high-precision instrument. In order to take efficiency into account, the frequency can be set to about 500Hz. When the measurement input or signal output frequency is 50Hz, the modulation frequency can be set to 500Hz. When the measurement input or signal output frequency is 60Hz, the modulation frequency can be set to 600Hz.

[0089] For example, to output a standard voltage of 100V at 50Hz, the frequency can be adjusted to 500Hz. According to the orthogonal principle, the influence of the 500Hz signal can be ignored due to the orthogonality of the function. When the frequency of the modulated trapezoidal wave is 50.01Hz and the output frequency is 50Hz, assuming that the interference signal is 100mV, the influence on the output is about 0.1%. When the frequency of the modulated trapezoidal wave is 500Hz, assuming that the interference signal is 100mV, the influence on the output is about 0.00005%. The same interference signal can reduce the influence of the beat frequency on the output of high-precision instruments through different modulation frequencies.

[0090] By dynamically adjusting the frequency signal of the trapezoidal wave through the input circuit 700, the influence of the beat frequency on the output of the high-precision instrument is reduced, and the accuracy of the output of the high-precision instrument is improved.

[0091] It should be noted that if the control circuit 100 does not receive the frequency modulation signal, the control circuit 100 outputs the first digital signal and the second digital signal according to the default modulation frequency.

[0092] By way of example and not limitation, Fig. 9 As shown, the control circuit 100 is further configured to output a display signal according to the frequency modulation signal, and the power supply further includes a display circuit 800 connected to the control circuit 100 and configured to display according to the display signal.

[0093] The display circuit 800 may be a dot matrix simple liquid crystal display module.

[0094] The modulation frequency, output voltage, etc. can be displayed by the display circuit 800, so that the user can know the currently set modulation frequency for optimization and adjustment.

[0095] Fig.10 A partial exemplary circuit structure of a power supply provided by an embodiment of the present application is shown. For the sake of convenience, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0096] The first digital-to-analog conversion module 212 includes a first digital-to-analog converter A2.

[0097] The reference voltage input terminal VREF of the first digital-to-analog converter A2 serves as the first reference voltage input terminal of the first digital-to-analog conversion module 212, and is connected to the first reference voltage module 211 to input the first reference voltage; the serial data signal input terminal DIN of the first digital-to-analog converter A2 serves as the first digital signal input terminal of the first digital-to-analog converter A2, and is connected to the control circuit 100 to input the first digital signal; the analog output voltage terminal VOUT of the first digital-to-analog converter A2 serves as the fifth trapezoidal wave output terminal of the first digital-to-analog conversion module 212, and is connected to the first amplification module 213 to output the fifth trapezoidal wave.

[0098] The circuit is simple and reliable.

[0099] The first amplifying module 213 includes a first operational amplifier M1 , a second resistor R2 , and a third resistor R3 .

[0100] The non-inverting input terminal of the first operational amplifier M1 serves as the fifth trapezoidal wave input terminal of the first amplifying module 213, and is connected to the first digital-to-analog conversion module 212 to input the fifth trapezoidal wave; the inverting input terminal of the first operational amplifier M1 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, and the output terminal of the first operational amplifier M1 and the second end of the second resistor R2 serve together as the third trapezoidal wave output terminal of the first amplifying module 213, and are connected to the first power amplifier circuit 220 to output the third trapezoidal wave; the second end of the third resistor R3 is connected to the power ground.

[0101] The amplification factor of the first amplifying module 213 can be adjusted by changing the resistance ratio of the second resistor R2 to the third resistor R3. In a specific implementation, the resistance ratio of the second resistor R2 to the third resistor R3 can be 3:1.

[0102] The control circuit 100 includes a processor A1.

[0103] The SPI1 master output slave input terminal SPI1_MOSI of the processor A1 serves as the first digital signal output terminal of the control circuit 100, and is connected to the first conversion circuit 200 to output a first digital signal; the SPI0 master output slave input terminal SPI0_MOSI of the processor A1 serves as the second digital signal output terminal of the control circuit 100, and is connected to the second conversion circuit 300 to output a second digital signal.

[0104] The second digital-to-analog conversion module 312 includes a second digital-to-analog converter A3 and a second operational amplifier M2 .

[0105] The reference voltage input terminal VREF of the second digital-to-analog converter A3 serves as the second reference voltage input terminal of the second digital-to-analog conversion module 312, and is connected to the second reference voltage module 311 to input the second reference voltage; the serial data signal input terminal DIN of the second digital-to-analog converter A3 serves as the second digital signal input terminal of the second digital-to-analog converter A3, and is connected to the control circuit 100 to input the second digital signal; the analog output voltage terminal VOUT of the second digital-to-analog converter A3 serves as the sixth trapezoidal wave output terminal of the second digital-to-analog conversion module 312, and is connected to the second amplification module 313 to output the sixth trapezoidal wave.

[0106] The second amplifying module 313 includes a second operational amplifier M2 , a fourth resistor R4 , and a fifth resistor R5 .

[0107] The non-inverting input terminal of the second operational amplifier M2 serves as the sixth trapezoidal wave input terminal of the second amplifying module 313, and is connected to the second digital-to-analog conversion module 312 to input the sixth trapezoidal wave; the inverting input terminal of the second operational amplifier M2 is connected to the second end of the fourth resistor R4 and the second end of the fifth resistor R5, and the output terminal of the second operational amplifier M2 and the second end of the fourth resistor R4 jointly serve as the fourth trapezoidal wave output terminal of the second amplifying module 313, and are connected to the second power amplifier circuit 320 to output the fourth trapezoidal wave; the second end of the fifth resistor R5 is connected to the power ground.

[0108] The first power amplifier circuit 220 includes a third operational amplifier M3.

[0109] The non-inverting input terminal of the third operational amplifier M3 serves as the third trapezoidal wave input terminal of the first power amplifier circuit 220, and is connected to the first digital-to-analog conversion circuit 210 to input the third trapezoidal wave; the inverting input terminal of the third operational amplifier M3 and the output terminal of the third operational amplifier M3 serve together as the first trapezoidal wave U1 output terminal of the first power amplifier circuit 220, and are connected to the boost circuit 400 to output the first trapezoidal wave U1.

[0110] The third operational amplifier M3 may be a power amplifier.

[0111] The second power amplifier includes a fourth operational amplifier M4.

[0112] The non-inverting input terminal of the fourth operational amplifier M4 serves as the fourth trapezoidal wave input terminal of the second power amplifier circuit 320, and is connected to the second digital-to-analog conversion circuit 310 to input the fourth trapezoidal wave; the inverting input terminal of the fourth operational amplifier M4 and the output terminal of the fourth operational amplifier M4 serve together as the second trapezoidal wave U2 output terminal of the second power amplifier circuit 320, and are connected to the boost circuit 400 to output the second trapezoidal wave U2.

[0113] The fourth operational amplifier M4 may be a power amplifier.

[0114] The boost circuit 400 includes a transformer T1.

[0115] The first end of the primary side of the transformer T1 serves as the first trapezoidal wave U1 input end of the boost circuit 400, and is connected to the first conversion circuit 200 to input the first trapezoidal wave U1; the second end of the primary side of the transformer T1 serves as the second trapezoidal wave U2 input end of the boost circuit 400, and is connected to the second conversion circuit 300 to input the second trapezoidal wave U2; the first end of the secondary side of the transformer T1 and the second end of the secondary side of the transformer T1 serve as the AC output end of the boost circuit 400, and are connected to the rectifier and filter circuit 500 to output AC power.

[0116] Transformer T1 can be a high-frequency transformer, and the ratio of the number of turns of its secondary side to that of the primary side can be no more than 40 and no less than 2. The maximum load of the first direct current VOUT is related to the ratio of the number of turns of the secondary side to that of the primary side of the transformer T1. For example, if the peak value of the first trapezoidal wave voltage is 10V, the drive current is 10A, and the ratio of the number of turns of the secondary side to that of the primary side is 10:1, then the transformation ratio of the output load current is 1:10, that is, the power supply can output a maximum of 100V, 1A direct current.

[0117] Increasing the withstand voltage of transformer T1 can achieve higher DC high voltage power output.

[0118] The rectifying and filtering circuit 500 includes a rectifying bridge D1 , an inductor L1 , a first resistor R1 , and a capacitor C1 .

[0119] The first AC input terminal of the rectifier bridge D1 and the second AC input terminal of the rectifier bridge D1 are jointly used as the AC input terminal of the rectifier and filter circuit 500, and are connected to the boost circuit 400 to input AC power; the positive output terminal of the rectifier bridge D1 is connected to the first end of the inductor L1, and the negative output terminal of the rectifier bridge D1 and the second end of the inductor L1, the first end of the first resistor R1, the second end of the first resistor R1, the first end of the capacitor C1, and the second end of the capacitor C1 are jointly used as the first DC power VOUT output terminal of the rectifier and filter circuit 500 to output the first DC power VOUT.

[0120] Increasing the withstand voltage of the rectifier bridge D1 and the capacitor C1 can achieve a higher DC high voltage power output.

[0121] The capacitor C1 may be a high voltage electrolytic capacitor.

[0122] The rectifier bridge D1 rectifies the alternating current, and the capacitor C1 and the inductor L1 filter the rectified alternating current to output a first direct current VOUT.

[0123] The first resistor R1 may be a power resistor, and is used to accelerate the discharge of the capacitor C1 when the output of the first direct current VOUT stops, so as to prevent the inductor L1 and the capacitor C1 from self-oscillating.

[0124] The following is a combination of working principles Fig.10 As shown for further explanation:

[0125] The input circuit 700 outputs a frequency modulated signal to the processor A1 according to the operation. The processor A1 outputs a first digital signal from the SPI1 host output slave input terminal SPI1_MOSI of the processor A1 to the serial data signal input terminal DIN of the first digital-to-analog converter A2 according to the received output frequency modulated signal. The second digital signal is output from the SPI0 host output slave input terminal SPI0_MOSI of the processor A1 to the serial data signal input terminal DIN of the second digital-to-analog converter A3. The energy storage circuit 600 outputs a second direct current to the first reference voltage module 211 and the second reference voltage module 311. The first reference voltage module 211 converts the second direct current into a first reference voltage and outputs it to the reference voltage input terminal VREF of the first digital-to-analog converter A2. The second reference voltage module 311 converts the second direct current into a second reference voltage and outputs it to the reference voltage input terminal VREF of the second digital-to-analog converter A3. The first digital-to-analog converter A2 performs digital-to-analog conversion on the first digital signal based on the first reference voltage, and outputs a fifth trapezoidal wave from the analog output voltage terminal VOUT of the first digital-to-analog converter A2 to the non-inverting input terminal of the first operational amplifier M1. The first operational amplifier M1 amplifies the fifth trapezoidal wave, and outputs a third trapezoidal wave from the output terminal of the first operational amplifier M1 and the second end of the second resistor R2 to the non-inverting input terminal of the third operational amplifier M3. The third operational amplifier M3 performs current amplification on the third trapezoidal wave, and outputs a first trapezoidal wave U2 from the output terminal of the third operational amplifier M3 to the first primary input terminal of the transformer T1. The second digital-to-analog converter A3 performs digital-to-analog conversion on the second digital signal based on the second reference voltage, and outputs a sixth trapezoidal wave from the analog output voltage terminal VOUT of the second digital-to-analog converter A3 to the non-inverting input terminal of the second operational amplifier M2. The second operational amplifier M2 The sixth trapezoidal wave is amplified, and the fourth trapezoidal wave is output from the output end of the second operational amplifier M2 and the second end of the fourth resistor R4 to the non-inverting input end of the fourth operational amplifier M4. The fourth operational amplifier M4 amplifies the current of the fourth trapezoidal wave, and outputs the second trapezoidal wave U2 from the output end of the fourth operational amplifier M4 to the second primary input end of the transformer T1. The transformer T1 boosts the voltage difference between the input first trapezoidal wave U1 and the second trapezoidal wave U2, and outputs AC power from the first end of the secondary side of the transformer T1 and the second end of the secondary side of the transformer T1 to the first AC input end of the rectifier bridge D1 and the second AC input end of the rectifier bridge D1. The rectifier bridge D1 rectifies the AC power, and outputs the rectified AC power from the positive output end of the rectifier bridge D1 and the negative output end of the rectifier bridge D1. The inductor L1 and the capacitor C1 filter the rectified AC power to output the first DC power VOUT.

[0126] An embodiment of the present application also provides an electronic device, which includes the above-mentioned power supply.

[0127] An embodiment of the present application further provides a measurement system, which includes a measurement device and the above-mentioned power supply.

[0128] The frequency of the first trapezoidal wave and the frequency of the second trapezoidal wave are integer multiples of the frequency of the input signal of the measuring device or integer multiples of the frequency of the output signal of the measuring device.

[0129] Since the frequency of the first trapezoidal wave and the frequency of the second trapezoidal wave are integer multiples of the input signal frequency of the measuring device or the output signal frequency of the measuring device, the influence of the first trapezoidal wave and the second trapezoidal wave can be ignored due to the orthogonality of the functions, thereby reducing the influence of the beat frequency on the output of high-precision instruments.

[0130] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0131] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply, characterized in that: include: a control circuit configured to output a first digital signal and a second digital signal; a first conversion circuit, connected to the control circuit, configured to convert the first digital signal to output a first trapezoidal wave; a second conversion circuit connected to the control circuit and configured to convert the second digital signal to output a second trapezoidal wave, wherein the first trapezoidal wave and the second trapezoidal wave have the same polarity and do not overlap each other; a boost circuit connected to the first conversion circuit and the second conversion circuit, and configured to boost the voltage difference between the first trapezoidal wave and the second trapezoidal wave to output alternating current; The rectifying and filtering circuit is connected to the boosting circuit and is configured to rectify and filter the alternating current to output a first direct current.

2. The power supply according to claim 1, characterized in that: Also includes: The energy storage circuit is configured to output a second direct current to power each functional module.

3. The power supply according to claim 2, characterized in that: The first conversion circuit comprises: a first digital-to-analog conversion circuit connected to the control circuit and the energy storage circuit, and configured to perform digital-to-analog conversion on the first digital signal based on the second direct current to output a third trapezoidal wave; The first power amplifier circuit is connected to the first digital-to-analog conversion circuit and the boost circuit, and is configured to amplify the current of the third trapezoidal wave to output the first trapezoidal wave.

4. The power supply according to claim 3, characterized in that: The first digital-to-analog conversion circuit comprises: a first reference voltage module, connected to the energy storage circuit, and configured to perform voltage conversion on the second direct current to output a first reference voltage; A first digital-to-analog conversion module is connected to the first reference voltage module, the control circuit and the first power amplifier circuit, and is configured to perform digital-to-analog conversion on the first digital signal based on the first reference voltage to output a fifth trapezoidal wave; The first amplifying module is connected to the first digital-to-analog conversion module and is configured to amplify the fifth trapezoidal wave to output the third trapezoidal wave.

5. The power supply according to claim 4, characterized in that: The first digital-to-analog conversion module includes a first digital-to-analog converter; The reference voltage input terminal of the first digital-to-analog converter serves as the first reference voltage input terminal of the first digital-to-analog conversion module and is connected to the first reference voltage module to input the first reference voltage; The serial data signal input terminal of the first digital-to-analog converter serves as the first digital signal input terminal of the first digital-to-analog converter, and is connected to the control circuit to input the first digital signal; the analog output voltage terminal of the first digital-to-analog converter serves as the fifth trapezoidal wave output terminal of the first digital-to-analog conversion module, and is connected to the first amplification module to output the fifth trapezoidal wave.

6. The power supply according to claim 2, characterized in that: The second conversion circuit comprises: a second digital-to-analog conversion circuit connected to the control circuit and the energy storage circuit, and configured to perform digital-to-analog conversion on the second digital signal based on the second direct current to output a fourth trapezoidal wave; The second power amplifier circuit is connected to the second digital-to-analog conversion circuit and the boost circuit, and is configured to amplify the current of the fourth trapezoidal wave to output the second trapezoidal wave.

7. The power supply according to claim 6, characterized in that: The second digital-to-analog conversion circuit comprises: a second reference voltage module, connected to the energy storage circuit, and configured to perform voltage conversion on the second direct current to output a second reference voltage; A second digital-to-analog conversion module, connected to the second reference voltage module and the control circuit, configured to perform digital-to-analog conversion on the second digital signal based on the second reference voltage to output a sixth trapezoidal wave; The second amplifying module is connected to the second digital-to-analog conversion module and the second power amplifying circuit, and is configured to amplify the sixth trapezoidal wave to output the fourth trapezoidal wave.

8. The power supply according to claim 1, characterized in that: Also includes: An input circuit, connected to the control circuit and configured to output a frequency modulation signal according to the operation; The control circuit is specifically configured to output the first digital signal, the second digital signal and a display signal according to the frequency modulation signal; The display circuit is connected to the control circuit and is configured to display according to the display signal.

9. An electronic device, characterized in that: Comprising the power supply according to any one of claims 1 to 8.

10. A measurement system, characterized in that: comprising a measuring device and a power supply as claimed in any one of claims 1 to 8; The frequency of the first trapezoidal wave and the frequency of the second trapezoidal wave are integer multiples of the frequency of the input signal of the measuring device or integer multiples of the frequency of the output signal of the measuring device.

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