CN109189140B - Ripple current generation circuit - Google Patents
Ripple current generation circuit Download PDFInfo
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- CN109189140B CN109189140B CN201811177216.XA CN201811177216A CN109189140B CN 109189140 B CN109189140 B CN 109189140B CN 201811177216 A CN201811177216 A CN 201811177216A CN 109189140 B CN109189140 B CN 109189140B
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- 239000003990 capacitor Substances 0.000 claims abstract description 69
- 238000007599 discharging Methods 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 39
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 238000004088 simulation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The invention discloses a ripple current generating circuit, which comprises a direct current source, a first capacitor and a capacitor to be tested, wherein two ends of the first capacitor are connected in parallel with two ends of the direct current source, the direct current source is used for providing direct current ripple voltage, the ripple current generating circuit also comprises a low-frequency ripple current charging circuit comprising an inductor, a second power tube and a second diode, a high-frequency ripple current discharging circuit comprising a transformer, the first power tube, the first diode and a power tube protection circuit, and a control and driving circuit. The ripple current generating circuit has the advantages of small test energy consumption, convenient circuit adjustment, capability of meeting the test requirements of different current ripples without capacity, simple circuit, low cost, small volume and high performance, and has higher application value.
Description
Technical Field
The invention relates to a ripple current generating circuit, in particular to a circuit for generating current ripple which is applied to low-frequency pulsating current charging and high-frequency pulsating current discharging for electrolytic capacitor testing.
Background
At present, the switching power supply is widely applied to the fields of military, industry and civil use, realizes energy conversion and transmission, and meets the power supply requirement of loads. In the application occasion of AC/DC under 75W, the scheme with higher cost performance adopts diode rectification and electrolytic capacitor filtering to obtain pulsating voltage, and the subsequent power converter provides working voltage.
The electrolytic capacitor has characteristics, and thus limits the use of the AC/DC converter. In general, for 220VAC input cases, 400V withstand voltage electrolytic capacitors are used as bus filter capacitors. However, when the withstand voltage of the electrolytic capacitor is more than 250V, the electrolytic capacitor can be operated at a low temperature of-25 ℃. Partial applications requiring operation at-40 ℃ cannot be met, thus limiting the application of AC/DC converters. In order to solve the temperature problem, CBB film capacitors can be used for filtering, but the defects of overlarge volume and overlarge cost exist.
Since the life of an electrolytic capacitor is related to its withstand voltage, equivalent series resistance (ESR: equivalent Series Resistance), ripple Current (Ripple Current), loss angle (tg δ), and the like, it is particularly the maximum Ripple Current, i.e., rated Ripple Current (IRAC). In practical application, the charging and discharging modes of the electrolytic capacitor are as follows: the low-frequency pulsating current is charged and the high-frequency pulsating current is discharged. The low-frequency charging frequency is 2 times of the input alternating voltage (if the input frequency is 50Hz/60Hz alternating current, the frequency of capacitor charging is 100Hz/120 Hz), the charging time is shorter, and the charging is completed within 1 ms; the high frequency discharge frequency is the operating frequency of the converter (e.g., 65KHz switching frequency). The special charge-discharge mode has great influence on ripple current born by the electrolytic capacitor, and further influences the service life of the electrolytic capacitor.
For testing ripple waves of the electrolytic capacitor, the conventional method is to realize charging and discharging of the electrolytic capacitor by adopting a power resistor and power switch tube mode, as shown in fig. 1, a circuit formed by a direct current source, a power tube, two resistors, a control circuit and a driving circuit is used for verifying the service life of the electrolytic capacitor, and the circuit is simpler due to the adoption of the resistor energy consumption mode. However, the testing method has the defects of high energy consumption, large system volume and the like, is difficult to meet the current social energy-saving and environment-friendly development requirements, and can increase the production cost of the electrolytic capacitor, in particular to the testing cost of the electrolytic capacitor.
In order to solve the above-mentioned problems, patent document CN105242737a discloses a ripple current generating method and circuit, as shown in fig. 2, which includes a dc source, an inductor, a transformer, a capacitor (being the measured capacitor), a diode, and a control and driving circuit. This patent document also gives another example, as shown in fig. 3. The device comprises a direct current source, an inductor, a transformer, a capacitor (which is a measured capacitor), a diode and a control and driving circuit, can realize the charge and discharge functions of the electrolytic capacitor, and has the characteristics of low cost, low energy consumption, simple wiring and small volume. However, the circuit shown in fig. 2 can only realize the life verification of high-frequency charging and discharging of the electrolytic capacitor, and the circuit shown in fig. 3 can only realize the life verification of direct-current charging and high-frequency current discharging of the electrolytic capacitor. In practice, the operating current of the electrolytic capacitor in the switching converter is characterized by: the low-frequency pulsating current is charged and the high-frequency pulsating current is discharged. Therefore, the method and the circuit proposed by the patent cannot meet the requirement of low-frequency pulsating current charging, so that the reliability of the service life test result of the electrolytic capacitor is reduced.
In summary, when the ripple current of the electrolytic capacitor is tested to verify the service life of the electrolytic capacitor, the existing method is difficult to simultaneously meet the requirements of low-power consumption test and real simulation of the working state of the electrolytic capacitor, so that the test cost is high and the reliability of the test result is low.
Disclosure of Invention
In view of the above, the technical problem solved by the invention is to overcome the defects of the existing method, and provide a ripple current generating circuit which can provide the functions of low-frequency ripple current charging and high-frequency ripple current discharging, truly simulate the actual working condition of an electrolytic capacitor, and realize energy feedback to a power supply.
The technical scheme for solving the technical problems is as follows:
the utility model provides a ripple current generating circuit for the ripple current test of survey electric capacity, including direct current source, first electric capacity, survey electric capacity, first electric capacity both ends are parallelly connected at direct current source both ends, and the direct current source is used for providing direct current ripple voltage, still includes the low frequency ripple current charging circuit that contains inductance, second power tube, second diode, contains transformer, first power tube, first diode, power tube protection circuit's high frequency ripple current discharging circuit, control and drive circuit, and the transformer includes primary winding and secondary winding, and its relation of connection is:
the input end of the low-frequency pulsating current charging circuit is connected with the positive electrode of the direct current source, the output end of the low-frequency pulsating current charging circuit is connected with the input end of the high-frequency pulsating current discharging circuit, the output end of the high-frequency pulsating current discharging circuit is connected with the positive electrode of the direct current source, the control end of the low-frequency pulsating current charging circuit is connected with one control end of the control and drive circuit, the control end of the high-frequency pulsating current discharging circuit is connected with the other control end of the control and drive circuit, and the drive and control circuit is used for realizing state control of a second power tube and a first power tube in the low-frequency pulsating current charging circuit and the high-frequency pulsating current discharging circuit;
one end of the tested capacitor is connected between the output of the low-frequency pulsating current charging circuit and the input of the high-frequency pulsating current discharging circuit, and the other end of the tested capacitor is connected with the control and driving circuit to be referenced to the ground.
Preferably, in the low-frequency pulsating current charging circuit, a drain electrode of the second power tube is used as an input end of the low-frequency pulsating current charging circuit, a source electrode of the second power tube is connected with one end of an inductor and a cathode of the second diode, the other end of the inductor is used as an output end of the low-frequency pulsating current charging circuit, an anode of the second diode is connected with a cathode of a direct current source and a control and driving circuit is grounded, and a grid electrode of the second power tube is used as a control end of the low-frequency pulsating current charging circuit.
Preferably, as an improvement of the above solution, in the low-frequency pulsating current charging circuit, one end of the inductor is used as an input end of the low-frequency pulsating current charging circuit, the other end of the inductor is used as an output end of the low-frequency pulsating current charging circuit, the cathode of the second diode is connected with the positive electrode of the direct current source, the anode of the second diode is connected with the drain electrode of the second power tube, the control and driving circuit is grounded, the source electrode of the second power tube is connected with the negative electrode of the direct current source, and the grid electrode of the second power tube is used as the control end of the low-frequency pulsating current charging circuit.
Preferably, in the high-frequency pulsating current discharging circuit, the same-name end of the primary winding of the transformer is used as an input end of the high-frequency pulsating current discharging circuit, the different-name end of the primary winding of the transformer is connected with a drain electrode of the first power tube, a grid electrode of the first power tube is used as a control end of the high-frequency pulsating current discharging circuit, a source electrode of the first power tube is connected with a control and driving circuit by referring to the ground and a positive electrode of the first diode, a negative electrode of the first diode is connected with the same-name end of the secondary winding of the transformer, the different-name end of the secondary winding of the transformer is used as an output end of the high-frequency pulsating current discharging circuit, and two ends of the power tube protecting circuit are connected between the same-name end and the different-name end of the primary winding of the transformer.
Preferably, as an improvement of the high-frequency pulsating current discharging circuit, in the high-frequency pulsating current discharging circuit, a same-name end of a primary winding of a transformer is used as an input end of the high-frequency pulsating current discharging circuit, a different-name end of the primary winding of the transformer is connected with a drain electrode of a first power tube, a grid electrode of the first power tube is used as a control end of the high-frequency pulsating current discharging circuit, a source electrode of the first power tube is connected with a control and driving circuit reference ground and a same-name end of a secondary winding of the transformer, a different-name end of the secondary winding of the transformer is connected with a first diode anode, a cathode of the first diode is used as an output end of the high-frequency pulsating current discharging circuit, and two ends of a power tube protection circuit are connected between the same-name end and the different-name end of the primary winding of the transformer.
Preferably, the power tube protection circuit is constituted by an RCD circuit or an active clamp circuit.
The scheme provided by the invention can be combined into 4 embodiments, the working principle of which is described in detail in specific examples, and the invention overcomes the defects of the electrolytic capacitor ripple testing method in the prior art by integrating the working principle of the invention, and has the beneficial effects that:
(1) The function of low-frequency pulsating current charging and high-frequency pulsating current discharging of the tested capacitor is realized, and the application condition of the electrolytic capacitor is truly simulated;
(2) The measured capacitor discharge energy is fed back to the input power supply, and the scheme has the advantages of small test power consumption, small size and low cost.
Drawings
FIG. 1 is a schematic diagram of a prior art circuit for resistive ripple current generation;
FIG. 2 is a schematic diagram of a prior art circuit for high frequency ripple current generation;
FIG. 3 is a schematic diagram of a prior art DC charge and high frequency ripple current discharge circuit;
FIG. 4 is a schematic circuit diagram of a first embodiment of the present invention;
FIG. 5 is a diagram showing simulation results of a first embodiment of the present invention;
FIG. 6 is a development diagram of a simulation result charging process according to the first embodiment of the present invention;
FIG. 7 is a development diagram of a simulation result discharge process according to a first embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 9 is a schematic circuit diagram of a third embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a fourth embodiment of the present invention.
Detailed Description
The invention is characterized in that the low-frequency pulsating current charging circuit and the high-frequency pulsating current discharging circuit are controlled to realize the real application simulation of the low-frequency pulsating current charging and the high-frequency pulsating current discharging of the electrolytic capacitor, the low-frequency pulsating current charging circuit realizes the pulsating current charging of the tested capacitor according to the frequency doubling rate of the power frequency voltage, the high-frequency pulsating current discharging circuit realizes the high-frequency pulsating current discharging of the tested capacitor under the power frequency voltage, and simultaneously, the energy released by the tested capacitor is fed back to the input power supply in the high-frequency discharging process, so that the testing energy consumption of the electrolytic capacitor is greatly reduced.
The present invention will be described below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
First embodiment
Fig. 4 is a schematic circuit diagram of a ripple current generating circuit according to a first embodiment of the present invention, wherein the circuit includes a dc source Vin, a low-frequency ripple current charging circuit, a high-frequency ripple current discharging circuit, a measured capacitor C1, an input capacitor C2, and a control and driving circuit. The low-frequency pulsating current charging circuit comprises a power tube Q2, an inductor L1 and a diode D2, the high-frequency pulsating current discharging circuit comprises a power tube Q1, a diode D1, a transformer and a power tube protection circuit, the transformer comprises a primary winding and a secondary winding, and the connection relation of the circuits is as follows:
the input end of the low-frequency pulsating current charging circuit is connected with the positive electrode of the direct current source Vin and is simultaneously connected with the drain electrode of the power tube Q2; the source electrode of the power tube Q2 is connected with the cathode of the diode D2 and one end of the inductor L1; the other end of the inductor L1 is used as the output end of the low-frequency pulsating current charging circuit and is connected with the positive electrode of the tested capacitor C1; the anode of the diode D2 is connected with the cathode of the direct current source Vin, the cathode of the measured capacitor C1 and the control and driving circuit to be referenced to the ground; the input capacitor C2 is connected in parallel to two ends of the direct current source Vin; the input end of the high-frequency pulsating current discharging circuit is connected with the output end of the low-frequency pulsating current charging main circuit and is connected with the homonymous end of the primary winding of the transformer and the second port of the power tube protection circuit; the primary winding synonym end of the transformer is connected with the drain electrode of the power switch tube Q1 and the first port of the power tube protection circuit; the source electrode of the power switch tube Q1 is connected with the cathode of the direct current source Vin and the anode of the diode D1; the cathode of the diode D1 is connected with the same-name end of the secondary winding of the transformer; the secondary winding synonym end of the transformer is used as the output end of the high-frequency pulsating current discharging circuit and is connected with the positive electrode of the direct current source Vin; the control port Vg1 of the control circuit is connected with the grid electrode of the power tube Q1; the control port Vg2 of the control circuit is connected with the grid electrode of the power tube Q2; the control and drive circuit is connected with the negative electrode of the direct current source Vin in reference to the ground.
The power tube protection circuit in the circuit is composed of an RCD circuit or an active clamping circuit and is used for clamping the highest voltage of the drain and source electrodes of the power tube Q1, so that the phenomenon of overvoltage of the drain and source electrodes of the power tube Q1 is prevented, and the effect of protecting the power tube Q1 is achieved.
The operation principle of the ripple generating circuit of the present embodiment is described as follows:
(1) The driving signal Vg2 of the control and driving circuit controls the power tube Q2 at the frequency of 2 times of the power frequency voltage and with the on time of less than 1ms to realize the charging of the tested capacitor C1, the low-frequency pulsating current charging circuit works in an intermittent conduction mode, the expression of charging current is ic (t) = (Vin-Vc)/L1 x t, wherein Vin is the direct current source voltage, and Vc is the end voltage of the tested capacitor; when the power tube Q2 is turned off, the current of the inductor L1 is freewheeled through the diode D2 until the charging current is reduced to 0, the charging current expression in the freewheeling stage is ic (t) =ipk- (Vc)/L1 t, wherein Ipk is the peak current of the inductor L1, vc is the voltage of the end of the capacitor to be tested, thus obtaining low-frequency charging current ripple, simulating the charging characteristic of a bridge rectifier circuit on an electrolytic capacitor in an actual application occasion, wherein the inductor L1 can also avoid the impact of larger charging current on the circuit, and the diode D2 provides a freewheeling circuit for the inductor L1;
(2) The driving signal Vg1 of the control and driving circuit controls the power tube Q1 at high frequency (such as 65 KHz), realizes the discharge of the electrolytic capacitor, obtains high-frequency discharge current, simulates the energy transfer process of the electric energy conversion topology in the practical application occasion, and feeds back the energy released by the electrolytic capacitor to the input power supply end through the flyback transformer, thereby realizing the energy feedback function.
The circuit test simulation results are shown in fig. 5 (black shaded portions in the figure are due to waveform crowding), in which the simulation waveform symbols illustrate: vds Is the drain-source voltage of the power tube Q1, vc Is the terminal voltage of the electrolytic capacitor, ip Is the primary winding current of the transformer, IIn Is the input current, ic Is the current on the capacitor to be tested, is the current on the secondary diode D1 of the transformer, and it can be known by observing the current on the capacitor to be tested:
stage [ t0, t1 ]: the input power supply charges the tested capacitor through the low-frequency pulsating current charging main circuit, the current Ic on the tested capacitor rises rapidly, the voltage Vc at the end of the tested capacitor rises rapidly, the voltage is maintained until the time t1, and the current Ic and the voltage Vc reach the maximum at the moment; the capacitor to be tested is also subjected to high-frequency discharge at this stage.
Stage [ t1, t2 ]: the electrolytic capacitor continues to sustain the high frequency discharge until time t 2.
Fig. 6 and 7 are respectively simulated waveform development diagrams of the charge and discharge of the capacitor to be tested, and the circuit is in cyclic operation in the process.
Second embodiment
Fig. 8 is a schematic circuit diagram of a second embodiment of the ripple current generating circuit of the present invention, which is different from the first embodiment in that, in the low-frequency ripple current charging circuit, an input end of the low-frequency ripple current charging circuit is connected to an anode of the dc source Vin and to a cathode of the diode D2 and one end of the inductor L1; the other end of the inductor L1 is used as an output positive electrode of the low-frequency pulsating current charging circuit and is connected with the positive electrode of the capacitor C1 to be tested; the anode of the diode D2 is connected with the drain electrode of the power tube Q2 and the reference ground of the control driving circuit, and the source electrode of the power tube Q2 is connected with the cathode of the direct current source Vin.
The other circuit connection relationships and the operation principle of the present embodiment are the same as those of the first embodiment, and will not be described here.
Third embodiment
Fig. 9 is a schematic circuit diagram of a third embodiment of the ripple current generation circuit of the present invention, which is different from the first embodiment in that: in the high-frequency pulsating current discharging circuit, the homonymous end of a primary winding of a transformer is used as an input end of the high-frequency pulsating current discharging circuit and is connected with one end of a power tube protection circuit, the heteronymous end of the primary winding of the transformer is connected with the other end of the power tube protection circuit and a drain electrode of a power tube Q1, a source electrode of the power tube Q1 is connected with a control driving circuit reference ground and the homonymous end of a secondary winding of the transformer, the heteronymous end of the secondary winding of the transformer is connected with an anode of a diode D1, and a cathode of the diode D1 is used as an output end of a high-frequency pulsating current amplifying circuit and is connected with an anode of a direct current source Vin.
The other circuit connection relationships and the operation principle of the present embodiment are the same as those of the first embodiment, and will not be described here.
Fourth embodiment
Fig. 10 is a circuit schematic of a fourth embodiment of the ripple current generation circuit of the present invention, which differs from the first embodiment in that: the connection relation of each circuit is as follows:
in the low-frequency pulsating current charging circuit, the input end of the low-frequency pulsating current charging circuit is connected with the positive electrode of a direct current source Vin and is simultaneously connected with the cathode of a diode D2 and one end of an inductor L1; the other end of the inductor L1 is used as the output end of the low-frequency pulsating current charging circuit and is connected with the positive electrode of the tested capacitor C1; the anode of the diode D1 is connected with the drain electrode of the power tube Q2 and the reference ground of the control and drive circuit, and the source electrode of the power tube Q2 is connected with the cathode of the direct current source Vin.
In the high-frequency pulsating current discharging circuit, the same-name end of a primary winding of a transformer is used as an input end of the high-frequency pulsating current discharging circuit to be connected with one end of a power tube protection circuit, the different-name end of the primary winding of the transformer is connected with the other end of the power tube protection circuit and a drain electrode of a power tube Q1, a source electrode of the power tube Q1 is connected with a control driving circuit reference ground and the same-name end of a secondary winding of the transformer, the different-name end of the secondary winding of the transformer is connected with an anode of a diode D1, and a cathode of the diode D1 is used as an output end of the high-frequency pulsating current amplifying circuit to be connected with an anode of a direct current source Vin.
The working principle of the present embodiment is basically the same as that of the first embodiment, and thus is not described here again.
The above is only a preferred embodiment of the present invention, and alterations and modifications may be made to the above-described specific embodiment by those skilled in the art to which the present invention pertains. Therefore, the invention is not limited to the specific control modes disclosed and described above, and some modifications and changes of the invention should fall within the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (6)
1. The utility model provides a ripple current generation circuit for the ripple current test of survey electric capacity, including direct current source, first electric capacity, survey electric capacity, first electric capacity both ends are parallelly connected at the direct current source both ends, and the direct current source is used for providing direct current ripple voltage, its characterized in that: the low-frequency pulsating current charging circuit comprises a transformer, a first power tube, a first diode, a high-frequency pulsating current discharging circuit of a power tube protection circuit, a control and driving circuit, wherein the transformer comprises a primary winding and a secondary winding, and the connection relation is as follows:
the input end of the low-frequency pulsating current charging circuit is connected with the positive electrode of the direct current source, the output end of the low-frequency pulsating current charging circuit is connected with the input end of the high-frequency pulsating current discharging circuit, the output end of the high-frequency pulsating current discharging circuit is connected with the positive electrode of the direct current source, the control end of the low-frequency pulsating current charging circuit is connected with one control end of the control and drive circuit, the control end of the high-frequency pulsating current discharging circuit is connected with the other control end of the control and drive circuit, and the drive and control circuit is used for realizing state control of a second power tube and a first power tube in the low-frequency pulsating current charging circuit and the high-frequency pulsating current discharging circuit;
one end of the tested capacitor is connected between the output of the low-frequency pulsating current charging circuit and the input of the high-frequency pulsating current discharging circuit, and the other end of the tested capacitor is connected with the control and driving circuit to be referenced to the ground.
2. The ripple current generation circuit of claim 1, wherein: in the low-frequency pulsating current charging circuit, a drain electrode of the second power tube is used as an input end of the low-frequency pulsating current charging circuit, a source electrode of the second power tube is connected with one end of an inductor and a cathode of the second diode, the other end of the inductor is used as an output end of the low-frequency pulsating current charging circuit, an anode of the second diode is connected with a cathode of a direct current source and a control and driving circuit reference ground, and a grid electrode of the second power tube is used as a control end of the low-frequency pulsating current charging circuit.
3. The ripple current generation circuit of claim 1, wherein: in the low-frequency pulsating current charging circuit, one end of an inductor is used as an input end of the low-frequency pulsating current charging circuit, the other end of the inductor is used as an output end of the low-frequency pulsating current charging circuit, a cathode of a second diode is connected with an anode of a direct current source, an anode of the second diode is connected with a drain electrode of a second power tube, a control and driving circuit is grounded, a source electrode of the second power tube is connected with a cathode of the direct current source, and a grid electrode of the second power tube is used as a control end of the low-frequency pulsating current charging circuit.
4. The ripple current generation circuit of claim 1 or 2, wherein: in the high-frequency pulsating current discharging circuit, the same-name end of a primary winding of a transformer is used as an input end of the high-frequency pulsating current discharging circuit, a different-name end of the primary winding of the transformer is connected with a drain electrode of a first power tube, a grid electrode of the first power tube is used as a control end of the high-frequency pulsating current discharging circuit, a source electrode of the first power tube is connected with a control and driving circuit by referring to the ground and a first diode anode, a cathode of the first diode is connected with the same-name end of a secondary winding of the transformer, the different-name end of the secondary winding of the transformer is used as an output end of the high-frequency pulsating current discharging circuit, and two ends of a power tube protection circuit are connected between the same-name end and the different-name end of the primary winding of the transformer.
5. The ripple current generation circuit of claim 1 or 2, wherein: in the high-frequency pulsating current discharging circuit, the same-name end of a primary winding of a transformer is used as an input end of the high-frequency pulsating current discharging circuit, a different-name end of the primary winding of the transformer is connected with a drain electrode of a first power tube, a grid electrode of the first power tube is used as a control end of the high-frequency pulsating current discharging circuit, a source electrode of the first power tube is connected with a control and driving circuit in reference to the ground, the same-name end of a secondary winding of the transformer is connected with a different-name end of the secondary winding of the transformer, a cathode of the first diode is used as an output end of the high-frequency pulsating current discharging circuit, and two ends of a power tube protection circuit are connected between the same-name end and the different-name end of the primary winding of the transformer.
6. The ripple current generation circuit of claim 1, wherein: the power tube protection circuit is composed of an RCD circuit or an active clamp circuit.
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| CN201811177216.XA CN109189140B (en) | 2018-10-10 | 2018-10-10 | Ripple current generation circuit |
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| CN201811177216.XA CN109189140B (en) | 2018-10-10 | 2018-10-10 | Ripple current generation circuit |
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| CN109189140A CN109189140A (en) | 2019-01-11 |
| CN109189140B true CN109189140B (en) | 2024-02-13 |
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| CN110221645B (en) * | 2019-06-11 | 2021-05-18 | 广州金升阳科技有限公司 | Ripple current generating circuit |
| CN110333416A (en) * | 2019-08-07 | 2019-10-15 | 常州华威电子有限公司 | A kind of high-voltage electrolytic capacitor durability testing system and method |
| CN112319226A (en) * | 2020-10-14 | 2021-02-05 | 宝能(广州)汽车研究院有限公司 | LCR circuit current resonance analysis method, storage medium and equipment in high-voltage system |
| CN114264937A (en) * | 2021-12-28 | 2022-04-01 | 厦门市三安集成电路有限公司 | Semiconductor device test circuit and system |
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