CN216560824U - Low-frequency adjustable sine wave control circuit for capacitor ripple current test - Google Patents
Low-frequency adjustable sine wave control circuit for capacitor ripple current test Download PDFInfo
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Abstract
A low-frequency adjustable sine wave control circuit for testing capacitor ripple current relates to the technical field of capacitor testing. The waveform generator comprises a direct current input power supply, an output loop, a load capacitor, a control loop and a waveform generator, wherein the waveform generator is connected with the output loop through the control loop, the output loop is connected with the direct current input power supply, the output end of the output loop is connected with the load capacitor and a current sensor L1 in series, and the signal output end of a current sensor L1 is connected with the control loop. The utility model multiplies the voltage of the control current and the voltage of the low-frequency adjustable carrier wave by the principle of a multiplier to realize that the output current and the output frequency of the triode are adjustable, realizes the stability of the output current by utilizing the principle of operational amplifier virtual short, and effectively solves the defect that the current and the frequency of the traditional circuit can not be controlled simultaneously.
Description
Technical Field
The utility model relates to the technical field of capacitor testing, in particular to a low-frequency adjustable sine wave control circuit for capacitor ripple current testing.
Background
At present, with the upgrading and development of electronic products, the requirements on capacitors in circuits are higher and higher, and new requirements on the current and the frequency of the capacitors applied to different occasions are provided. Compared with some traditional test modes, the test frequency and the current can not be adjusted at the same time, so that a circuit for controlling the low-frequency adjustable sine wave for testing the ripple current of the capacitor needs to be designed according to the condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-frequency adjustable sine wave control circuit for testing capacitor ripple current, which can effectively solve the problems in the background art.
The technical scheme for realizing the purpose is as follows: the utility model provides an adjustable sine wave control circuit of low frequency for test of condenser ripple current which characterized in that: the device comprises a direct current input power supply, an output loop, a load capacitor, a control loop and a waveform generator, wherein the waveform generator is connected with the output loop through the control loop, the output loop is connected with the direct current input power supply, the output end of the output loop is connected with the load capacitor and a current sensor L1 in series, and the signal output end of a current sensor L1 is connected with the control loop;
the waveform generating circuit is used for generating a sine wave with adjustable frequency of 10-1000HZ as a fundamental wave of output control and transmitting the sine wave to the control loop;
the control loop comprises an alternating current-to-direct current level circuit, an integral operational amplifier circuit and an analog multiplication circuit, wherein the multiplication circuit is connected with the waveform output end of the waveform generation circuit, the input end of the alternating current-to-direct current level circuit is connected with the current sensor, the alternating current-to-direct current level circuit is connected with the input end of the integral operational amplifier circuit, the output end of the integral operational amplifier circuit is connected with the analog multiplication circuit, and the output end of the analog multiplication circuit is connected with the output loop;
the AC-DC level circuit is used for converting AC current collected by the current sensor from a sine wave effective value into DC level and transmitting the DC level to the integral operational amplifier circuit, the integral operational amplifier circuit is used for adjusting the output current and keeping the output stable, the multiplication circuit is used for synthesizing the sine wave output by the waveform generation circuit and the output current of the integral operational amplifier circuit into a group of sine waves with adjustable frequency and amplitude and transmitting the group of sine waves with adjustable frequency and amplitude to the output circuit;
the output loop comprises a triode drive circuit and a current push-pull amplification circuit connected to the output end of the triode drive circuit, the input end of the triode drive circuit is connected with the control loop, the triode drive circuit is used for converting input sine waves into two groups of low-frequency sine waves with the same frequency and different amplitudes, and the current push-pull amplification circuit is used for synthesizing the two groups of low-frequency sine waves with the same frequency and different amplitudes into a group of driving waveforms with adjustable frequency and amplitude.
Further, the current push-pull amplifying circuit comprises triodes Q3 and Q4, a plurality of triodes Q1, a plurality of triodes Q5, a plurality of resistors R12 and a plurality of resistors R14;
the input end of the triode driving circuit is connected with the control loop, the triode driving circuit is provided with driving output ends OUTA and OUTB, the driving output end OUTA is connected with the base electrode of the triode Q3, the driving output end OUTB is connected with the base electrode of the triode Q4, the collector electrode of the triode Q3 is connected with the positive electrode of a direct-current input power supply, the collector electrode of the triode Q4 is connected with the negative electrode of the direct-current input power supply, a plurality of triodes Q1 are connected in parallel between the collector electrode and the emitter electrode of the triode Q3, a plurality of triodes Q5 are connected in parallel between the collector electrode and the emitter electrode of the triode Q4, the emitter electrode of each triode Q1 is respectively connected with one end of a resistor R12, the emitter electrode of each triode Q5 is respectively connected with one end of a resistor R14, the other ends of the resistors R12 and R14 are connected in parallel with one end of a load capacitor C5, and the other end of the load capacitor C5 is connected with a current sensor L1 in series and then grounded.
Furthermore, the waveform generating circuit comprises a waveform generator U2, an MCU controller, an operational amplifier U1, a crystal oscillator Y1, a resistor R1 and a resistor R2, wherein a pin 1 of the crystal oscillator Y1 is connected with the positive electrode of a 3.3V power supply, a pin 3 is grounded, a pin 4 is connected with a pin 5 of the waveform generator U2, square waves are provided for the waveform generator U2 through the crystal oscillator Y1, and a pin 2 of the waveform generator is connected with the positive electrode of the 3.3V power supply and the pin 4 is grounded;
the MCU controller is connected with pins 6, 7 and 8 of the waveform generator U2 and controls the waveform generator U2 to output sine wave frequency;
one end of a pin 10 of the waveform generator U2 is connected with one end of a resistor R2, a pin 4 and a pin 7 of the operational amplifier U1 are connected with a 12V power supply, the other end of the resistor R2 is respectively connected with one end of a resistor R1 and a pin 2 of an operational amplifier U1, a pin 3 of the operational amplifier U1 is grounded, the other end of the resistor R1 is connected with a pin 6 of the operational amplifier U1, and the pin 6 of the operational amplifier U1 is used for outputting sine waves with adjustable frequency and is marked as sine waves.
Furthermore, the alternating current-direct current level circuit comprises resistors R8, R9, R10, R11, an adjustable resistor RW1, a direct current converter U5, capacitors C3 and C4, wherein one end of the resistor R8 is connected to the current sensor L1, the other end of the resistor R8 is connected to the 15 pin of the direct current converter U5, one end of the resistor R10 is connected to the positive electrode of the 5V power supply, the other end of the resistor R5 is connected to one end of the adjustable resistor RW1, the other end of the adjustable resistor RW1 is connected in series with the resistor R11 and then grounded, and the movable arm pin of the adjustable resistor 1 is connected to the 4 pin of the direct current converter U5;
the direct current converter U5 has a pin 1 and a pin 3 grounded, a pin 12 and a pin 13 connected with a 5V power supply, a pin 10 and a pin 11 connected with a capacitor C3, a pin 6 and a pin 10 connected with two ends of a capacitor C4, and a pin 6 and a pin 11 connected with two ends of a resistor R9.
Furthermore, the integrating operational amplifier circuit comprises resistors R5 and R6, an operational amplifier U3 and a capacitor C1, wherein one end of the resistor R6 is connected with the 11 pin of the DC converter U5, the other end of the resistor R6 is connected with the 3 pin of the operational amplifier U3, one end of the resistor R5 is connected with a current reference, the other end of the resistor R5 is connected with the 2 pin of the operational amplifier U3, and the capacitor C1 is connected between the 2 pin and the 6 pin of the operational amplifier U3.
Furthermore, the multiplication circuit comprises resistors R3, R4, R7, a diode D1, a capacitor C2 and an analog multiplier U4, wherein the negative end of the diode D1 is connected with the pin 6 of the operational amplifier U3, the positive end of the diode D1 is respectively connected with one ends of the resistors R3 and R4 and the pin 1 of the analog multiplier U4, the other end of the resistor R3 is connected with the positive electrode of the 12V power supply, and the other end of the resistor R4 is grounded;
the 2 pin, the 4 pin and the 8 pin of the analog multiplier U4 are connected with the ground, the 3 pin is connected with the negative electrode of a 12V power supply, the 6 pin is connected with the positive electrode of the 12V power supply, the 7 pin is connected with one end of a C2, the 5 pin is connected with one end of an R7, the other end of the C2 is connected with a waveform generating circuit, and the other end of a resistor R7 is connected with the input end of a triode driving circuit.
The utility model has the advantages of
The utility model multiplies the voltage of the control current and the voltage of the low-frequency adjustable carrier wave by the principle of a multiplier to realize the adjustability of the output current and the output frequency of the triode, realizes the stability of the output current by utilizing the principle of virtual short and virtual short of the operational amplifier, and effectively solves the defect that the current and the frequency of the traditional circuit can not be controlled simultaneously.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a circuit diagram of a waveform generation circuit;
FIG. 3 is a circuit diagram of an output circuit;
FIG. 4 is a circuit diagram of a control loop;
FIG. 5 is a diagram of the synthesized output current waveform analysis according to the present invention.
Detailed Description
As shown in fig. 1, the utility model discloses a low-frequency adjustable sine wave control circuit for capacitor ripple current testing, which specifically comprises a direct current input power supply 1, an output loop 2, a load capacitor 3, a control loop 4 and a waveform generating circuit 5.
The output circuit 2 comprises a triode drive circuit 2.1, triodes Q3 and Q4, a plurality of triodes Q1, a plurality of triodes Q5, a plurality of resistors R12 and a plurality of resistors R14, wherein the number of the triodes Q1 is the same as that of the triodes Q5, the number of the resistors R12 corresponds to that of the triodes Q1, and the number of the resistors R14 corresponds to that of the triodes Q5.
The input end of the triode drive circuit 2.1 is connected with the control loop 4, the triode drive circuit 2.1 is provided with output ends OUTA and OUTB, the output end OUTA is connected with the base of the triode Q3, the output end OUTB is connected with the base of the triode Q4, the collector of the triode Q3 is connected with the positive pole of the direct current input power supply 1, the collector of the triode Q4 is connected with the negative pole of the direct current input power supply 1, a plurality of triodes Q1 are connected in parallel between the collector and the emitter of the triode Q3, the collector of the triode Q1 is respectively connected with the collector of the triode Q3, the base of the triode Q1 is connected with the emitter of the triode Q3, a plurality of triodes Q5 are connected in parallel between the collector and the emitter of the triode Q4, the collector of the triode Q5 is respectively connected with the collector of the triode Q4, and the base of the triode Q5 is connected with the emitter of the triode Q4.
An emitter of each triode Q1 is connected with one end of a resistor R12, an emitter of each triode Q5 is connected with one end of a resistor R14, the other ends of the resistors R12 and R14 are connected in parallel and then connected with one end of a load capacitor C5, the other end of the load capacitor C5 is connected with a current sensor L1 in series and then grounded, and a current Hall sensor is adopted as the current sensor L1.
The waveform generating circuit 5 comprises a waveform generator U2, an MCU controller 5.1, an operational amplifier U1, a crystal oscillator Y1, resistors R1 and R2, wherein the model of the operational amplifier U1 is TL081, a pin 1 of the crystal oscillator Y1 is connected with a 3.3V power supply anode, a pin 3 is grounded, a pin 4 is connected with a pin 5 of the waveform generator U2, square waves are provided for the waveform generator U2 through the crystal oscillator Y1, and a pin 2 of the waveform generator is connected with a 3.3V power supply anode and a pin 4 is grounded.
The MCU controller 5.1 is connected with pins 6, 7 and 8 of the waveform generator U2 and controls the waveform generator U2 to output sine wave frequency.
One end of a pin 10 of the waveform generator U2 is connected with one end of a resistor R2, a pin 4 and a pin 7 of the operational amplifier U1 are connected with a 12V power supply, the other end of the resistor R2 is respectively connected with one end of a resistor R1 and a pin 2 of an operational amplifier U1, a pin 3 of the operational amplifier U1 is grounded, the other end of the resistor R1 is connected with a pin 6 of the operational amplifier U1, and the pin 6 of the operational amplifier U1 is used for outputting sine waves with adjustable frequency and is marked as sine waves.
The control loop 4 comprises an alternating current to direct current level circuit 4.1, an integrating operational amplifier circuit 4.2 and a multiplying circuit 4.3.
The alternating current-direct current level circuit 4.1 comprises resistors R8, R9, R10, R11, an adjustable resistor RW1, a direct current converter U5, capacitors C3 and C4, wherein the model of the direct current converter U5 is AD 637.
One end of the resistor R8 is connected with the current sensor L1, the other end of the resistor R8 is connected with the 15 pin of the DC converter U5, one end of the resistor R10 is connected with the anode of a 5V power supply, the other end of the resistor R10 is connected with one end of the adjustable resistor RW1, the other end of the adjustable resistor RW1 is connected with the resistor R11 in series and then grounded, and the movable arm pin of the adjustable resistor RW1 is connected with the 4 pin of the DC converter U5.
The direct current converter U5 has a pin 1 and a pin 3 grounded, a pin 12 and a pin 13 connected with a 5V power supply, a pin 10 and a pin 11 connected with a capacitor C3, a pin 6 and a pin 10 connected with two ends of a capacitor C4, and a pin 6 and a pin 11 connected with two ends of a resistor R9.
The integrating operational amplifier circuit 4.2 comprises resistors R5 and R6, an operational amplifier U3 and a capacitor C1, wherein the model of the operational amplifier U3 is OP 07.
One end of the resistor R6 is connected with the 11 pin of the DC converter U5, the other end of the resistor R3878 is connected with the 3 pin of the operational amplifier U3, one end of the resistor R5 is connected with the current reference, the other end of the resistor R5 is connected with the 2 pin of the operational amplifier U3, and the capacitor C1 is connected between the 2 pin and the 6 pin of the operational amplifier U3.
The multiplication circuit 4.3 comprises resistors R3, R4, R7, a diode D1, a capacitor C2 and an analog multiplier U4, wherein the model of the analog multiplier U4 is AD633 JN.
The negative end of the diode D1 is connected with pin 6 of the operational amplifier U3, the positive end is connected with one end of the resistors R3 and R4 and pin 1 of the analog multiplier U4, the other end of the resistor R3 is connected with the positive electrode of the 12V power supply, and the other end of the resistor R4 is grounded.
The 2 pin, the 4 pin and the 8 pin of the analog multiplier U4 are connected with the ground, the 3 pin is connected with the negative electrode of a 12V power supply, the 6 pin is connected with the positive electrode of the 12V power supply, the 7 pin is connected with one end of a C2, the 5 pin is connected with one end of an R7, the other end of the C2 is connected with the 6 pin of the operational amplifier U1, and the other end of the resistor R7 is connected with the input end of the triode drive circuit 2.1.
The working principle of the utility model is as follows:
firstly, the MCU controller 5.1 controls the waveform generator U2 to generate a sine wave with adjustable 10HZ-1000HZ, and the voltage amplification is carried out through a reverse circuit formed by the operational amplifier U1, the resistor R1 and the resistor R2, so that a low-frequency adjustable carrier wave is obtained and is marked as sine wave.
The low-frequency adjustable carrier wave passes through a capacitor C2 (the capacitor has the effect of isolating direct current and direct current), a low-frequency adjustable sine wave without a direct current component is obtained, and is input into an analog multiplier U4, an output driving signal is calculated by the analog multiplier U4 according to a formula W = (X1-X2) × (Y1-Y2)/10, wherein X1 is a fundamental wave output by a waveform generator U2, X2 is GND, Y1 is an output voltage of an operational amplifier U3, and Y2 is GND.
When changing the values of X1-X2 while Y1-Y2 are unchanged, the drive signal output by analog multiplier U4 changes linearly with respect to the input (X1-X2). X1-X2 are input low frequency tunable carriers, i.e., when the frequency of the carrier changes, the frequency of the output drive waveform changes simultaneously.
The driving signal output by the analog multiplier U4 is input to the transistor driving circuit 2.1 through the resistor R7, and two output driving signals OUTA and OUTB are obtained, and the specific waveform OUTA and waveform OUTB are shown in fig. 5. When the output voltage of the driving circuit 2.1 is larger than 1.4V, the triodes Q1 and Q3 are conducted to obtain the upper half cycle of the sine wave. Similarly, when the output voltage of the driving circuit 2.1 is less than 1.4V, the triodes Q4 and Q5 are turned on to obtain the second half cycle of the sine wave. Thereby obtaining a complete sine wave with adjustable frequency, and the sine wave is loaded on two ends of the load capacitor C5.
When the current reference Ua input by the pin 2 of the operational amplifier U3 increases, according to the principle of virtual short and virtual break of the operational amplifier Ua = Ub, Ub is the dc level output by the dc converter U5, the integrator circuit 4.2 formed by the operational amplifier U3 increases the Uc output by the operational amplifier U3, and then the voltage of Y1-Y2 increases, as analyzed by the analog multiplier U4, the amplitude of the sine wave of the driving signal output by the analog multiplier U4 increases, and the amplitude of the driving sine wave output by the triode driving circuit 2.1 increases, so that the base currents of the triodes Q3 and Q4 increase, and the currents are amplified by the triodes Q1, Q3 and Q4, so that the output hall collected current is converted into the dc level Ub by the dc converter U5 from the effective value of the ac current, and the output current is not stable until Ub = Ua. Vice versa, when the current reference Ua decreases, the output current becomes smaller until Ua = Ub, the output current stabilizes.
Claims (6)
1. The utility model provides an adjustable sine wave control circuit of low frequency for test of condenser ripple current which characterized in that: the device comprises a direct current input power supply, an output loop, a load capacitor, a control loop and a waveform generator, wherein the waveform generator is connected with the output loop through the control loop, the output loop is connected with the direct current input power supply, the output end of the output loop is connected with the load capacitor and a current sensor L1 in series, and the signal output end of a current sensor L1 is connected with the control loop;
the waveform generating circuit is used for generating a sine wave with adjustable frequency of 10-1000HZ as a fundamental wave of output control and transmitting the sine wave to the control loop;
the control loop comprises an alternating current-to-direct current level circuit, an integral operational amplifier circuit and an analog multiplication circuit, wherein the multiplication circuit is connected with the waveform output end of the waveform generation circuit, the input end of the alternating current-to-direct current level circuit is connected with the current sensor, the alternating current-to-direct current level circuit is connected with the input end of the integral operational amplifier circuit, the output end of the integral operational amplifier circuit is connected with the analog multiplication circuit, and the output end of the analog multiplication circuit is connected with the output loop;
the AC-DC level circuit is used for converting AC current collected by the current sensor from a sine wave effective value into DC level and transmitting the DC level to the integral operational amplifier circuit, the integral operational amplifier circuit is used for adjusting the output current and keeping the output stable, the multiplication circuit is used for synthesizing the sine wave output by the waveform generation circuit and the output current of the integral operational amplifier circuit into a group of sine waves with adjustable frequency and amplitude and transmitting the group of sine waves with adjustable frequency and amplitude to the output circuit;
the output loop comprises a triode drive circuit and a current push-pull amplification circuit connected to the output end of the triode drive circuit, the input end of the triode drive circuit is connected with the control loop, the triode drive circuit is used for converting input sine waves into two groups of low-frequency sine waves with the same frequency and different amplitudes, and the current push-pull amplification circuit is used for synthesizing the two groups of low-frequency sine waves with the same frequency and different amplitudes into a group of driving waveforms with adjustable frequency and amplitude.
2. The low-frequency adjustable sine wave control circuit for capacitor ripple current testing according to claim 1, wherein: the current push-pull amplifying circuit comprises triodes Q3 and Q4, a plurality of triodes Q1, a plurality of triodes Q5, a plurality of resistors R12 and a plurality of resistors R14;
the input end of the triode driving circuit is connected with the control loop, the triode driving circuit is provided with driving output ends OUTA and OUTB, the driving output end OUTA is connected with the base electrode of the triode Q3, the driving output end OUTB is connected with the base electrode of the triode Q4, the collector electrode of the triode Q3 is connected with the positive electrode of a direct-current input power supply, the collector electrode of the triode Q4 is connected with the negative electrode of the direct-current input power supply, a plurality of triodes Q1 are connected in parallel between the collector electrode and the emitter electrode of the triode Q3, a plurality of triodes Q5 are connected in parallel between the collector electrode and the emitter electrode of the triode Q4, the emitter electrode of each triode Q1 is respectively connected with one end of a resistor R12, the emitter electrode of each triode Q5 is respectively connected with one end of a resistor R14, the other ends of the resistors R12 and R14 are connected in parallel with one end of a load capacitor C5, and the other end of the load capacitor C5 is connected with a current sensor L1 in series and then grounded.
3. The low-frequency adjustable sine wave control circuit for capacitor ripple current testing according to claim 2, wherein: the waveform generating circuit comprises a waveform generator U2, an MCU controller, an operational amplifier U1, a crystal oscillator Y1, a resistor R1 and a resistor R2, wherein a pin 1 of the crystal oscillator Y1 is connected with the anode of a 3.3V power supply, a pin 3 is grounded, a pin 4 is connected with a pin 5 of the waveform generator U2, square waves are provided for the waveform generator U2 through the crystal oscillator Y1, and a pin 2 of the waveform generator is connected with the anode of the 3.3V power supply and the pin 4 is grounded;
the MCU controller is connected with pins 6, 7 and 8 of the waveform generator U2 and controls the waveform generator U2 to output sine wave frequency;
one end of a pin 10 of the waveform generator U2 is connected with one end of a resistor R2, a pin 4 and a pin 7 of the operational amplifier U1 are connected with a 12V power supply, the other end of the resistor R2 is respectively connected with one end of a resistor R1 and a pin 2 of an operational amplifier U1, a pin 3 of the operational amplifier U1 is grounded, the other end of the resistor R1 is connected with a pin 6 of the operational amplifier U1, and the pin 6 of the operational amplifier U1 is used for outputting sine waves with adjustable frequency and is marked as sine waves.
4. The low frequency adjustable sine wave control circuit for capacitor ripple current test of claim 3, wherein: the alternating current-direct current level circuit comprises resistors R8, R9, R10, R11, an adjustable resistor RW1, a direct current converter U5, capacitors C3 and C4, wherein one end of the resistor R8 is connected with a current sensor L1, the other end of the resistor R8 is connected with a pin 15 of a direct current converter U5, one end of the resistor R10 is connected with the positive electrode of a 5V power supply, the other end of the resistor R10 is connected with one end of the adjustable resistor RW1, the other end of the adjustable resistor RW1 is connected with a resistor R11 in series and then grounded, and a movable arm pin of the adjustable resistor RW1 is connected with a pin 4 of the direct current converter U5;
the direct current converter U5 has a pin 1 and a pin 3 grounded, a pin 12 and a pin 13 connected with a 5V power supply, a pin 10 and a pin 11 connected with a capacitor C3, a pin 6 and a pin 10 connected with two ends of a capacitor C4, and a pin 6 and a pin 11 connected with two ends of a resistor R9.
5. The low-frequency adjustable sine wave control circuit for capacitor ripple current testing according to claim 4, wherein: the integral operational amplifier circuit comprises resistors R5 and R6, an operational amplifier U3 and a capacitor C1, wherein one end of a resistor R6 is connected with an 11 pin of a direct current converter U5, the other end of the resistor R6 is connected with a 3 pin of the operational amplifier U3, one end of a resistor R5 is connected with a current reference, the other end of the resistor R5 is connected with a 2 pin of the operational amplifier U3, and the capacitor C1 is connected between the 2 pin and the 6 pin of the operational amplifier U3.
6. The low-frequency adjustable sine wave control circuit for capacitor ripple current testing according to claim 5, wherein: the multiplication circuit comprises resistors R3, R4, R7, a diode D1, a capacitor C2 and an analog multiplier U4, wherein the cathode end of the diode D1 is connected with a pin 6 of an operational amplifier U3, the anode end of the diode D1 is respectively connected with one ends of the resistors R3 and R4 and a pin 1 of the analog multiplier U4, the other end of the resistor R3 is connected with the anode of a 12V power supply, and the other end of the resistor R4 is grounded;
the 2 pin, the 4 pin and the 8 pin of the analog multiplier U4 are connected with the ground, the 3 pin is connected with the negative electrode of a 12V power supply, the 6 pin is connected with the positive electrode of the 12V power supply, the 7 pin is connected with one end of a C2, the 5 pin is connected with one end of an R7, the other end of the C2 is connected with a waveform generating circuit, and the other end of a resistor R7 is connected with the input end of a triode driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123224301.7U CN216560824U (en) | 2021-12-21 | 2021-12-21 | Low-frequency adjustable sine wave control circuit for capacitor ripple current test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123224301.7U CN216560824U (en) | 2021-12-21 | 2021-12-21 | Low-frequency adjustable sine wave control circuit for capacitor ripple current test |
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| CN216560824U true CN216560824U (en) | 2022-05-17 |
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| CN202123224301.7U Active CN216560824U (en) | 2021-12-21 | 2021-12-21 | Low-frequency adjustable sine wave control circuit for capacitor ripple current test |
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