CN212086060U - Servo driver soft start system - Google Patents
Servo driver soft start system Download PDFInfo
- Publication number
- CN212086060U CN212086060U CN202020348123.5U CN202020348123U CN212086060U CN 212086060 U CN212086060 U CN 212086060U CN 202020348123 U CN202020348123 U CN 202020348123U CN 212086060 U CN212086060 U CN 212086060U
- Authority
- CN
- China
- Prior art keywords
- circuit
- phase
- soft start
- voltage
- start system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
A soft start system of a servo driver drives a thyristor in a three-phase bridge type semi-controlled rectifying circuit by sampling three-phase alternating current input voltage and direct current bus voltage when the system is initially electrified, a mode of comparing voltage values is adopted, a filter capacitor of a filter circuit is charged in a segmented mode, the charging process is not influenced by power grid fluctuation, and the system is more stable and reliable. The utility model discloses saved soft start relay and pre-charge resistance, reduced mechanical contact, reduced the volume, strengthened the reliability.
Description
Technical Field
The utility model belongs to the technical field of variable pitch system control, a servo driver's soft start system is related to.
Background
The pitch-variable system is one of three electrical systems for the safe operation of the wind generating set, and changes the pitch angle of the blades according to the wind condition of the environment where the wind generating set is located, so as to achieve the purposes of adjusting power and protecting a fan. The servo driver is a core component and an execution structure of the variable pitch system, and the variable pitch controller controls the variable pitch motor through the servo driver, so that the aim of adjusting the angle of the fan blade is fulfilled. The main circuit structure of the servo driver generally adopts an uncontrollable rectification + inverter mode, the rectification circuit of the structure is simplest, a control circuit is not needed, but a soft start circuit is needed at the moment of electrifying because the direct-current voltage of the uncontrollable rectification circuit is uncontrollable.
A conventional soft start circuit is shown in fig. 1, and includes a diode rectifying unit 1, a soft start unit 2, a bus voltage detecting unit 3, a digital signal processor 4, a soft start relay coil (not shown), a filter capacitor 5, and voltage dividing resistors 6 and 7. The diode rectifying unit 1 is a rectifying bridge composed of 6 diodes, and the soft start unit 2 comprises a pre-charging resistor 8 and a soft start relay contact 9 which are connected in parallel. At the moment of electrifying, the soft start relay coil is not conducted, the soft start relay contact 9 is in a disconnected state, the diode rectifying unit 1 charges the filter capacitor 5 through the pre-charging resistor 8, after the bus voltage rises to a preset voltage value and is delayed for a period of time, the digital signal processor 4 controls the soft start relay coil to be conducted, the soft start relay contact 9 is closed, and the pre-charging resistor 8 is in a short circuit. Therefore, the soft start circuit has the defect that a soft start relay and a pre-charging resistor are adopted, and the conductive part of the soft start relay is a movable contact and is not suitable for passing large current. And the action voltage of the soft start relay can shake and oscillate, so that the whole work is unreliable.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
The utility model aims at providing a soft start-up system of servo driver, through to three-phase AC input voltage and direct current bus voltage sampling when the system is initial to go up, drive the thyristor among the three-phase bridge type half-controlled rectifier circuit, take the mode of comparative voltage value, the segmentation charges filter circuit's filter capacitor, and the charging process is not influenced by the grid fluctuation, and is more steady reliable. The utility model discloses saved soft start relay and pre-charge resistance, reduced mechanical contact, reduced the volume, strengthened the reliability.
(II) technical scheme
In order to solve the problems, the utility model provides a soft start system of a servo driver, which comprises a three-phase bridge type half-control rectifying circuit, a filter circuit, a bus voltage detection circuit, a three-phase alternating voltage detection circuit, a drive circuit and a microprocessor; the three-phase bridge type semi-controlled rectifying circuit is connected with a three-phase alternating current input power supply and a filter circuit; the three-phase alternating voltage detection circuit detects three-phase alternating voltage at the input end of the three-phase bridge type semi-controlled rectification circuit, the bus voltage detection circuit detects direct-current bus voltage at the output end of the three-phase bridge type semi-controlled rectification circuit, and the bus voltage detection circuit and the three-phase alternating voltage detection circuit are both connected with the microprocessor; and the microprocessor controls the three-phase bridge type semi-controlled rectifying circuit through the driving circuit.
According to the utility model discloses a further aspect, three-phase bridge type half-controlled rectifier circuit includes a three-phase half-wave uncontrollable rectifier circuit and a three-phase half-wave controllable rectifier circuit.
According to the utility model discloses an another aspect, above-mentioned three-phase half-wave uncontrolled rectifier circuit comprises the rectifier diode that three positive pole links together, and the positive pole that couples together is as the negative pole of this three-phase bridge type half-controlled rectifier circuit's output, also is the negative pole of direct current bus promptly.
According to the utility model discloses an another aspect, above-mentioned three-phase half-wave controllable rectifier circuit comprises the thyristor that three negative pole was connected, and the negative pole that connects up is as the positive pole of this three-phase bridge type half-controlled rectifier circuit's output, also is the positive pole of direct current bus promptly.
According to another aspect of the present invention, the filter circuit comprises at least one or more sets of filter capacitors connected in series, and the filter capacitors comprise electrolytic capacitors.
According to the utility model discloses a further aspect, busbar voltage sampling circuit contains voltage divider and busbar voltage detection module, the voltage divider comprises two or more resistance series connection, busbar voltage detection module is used for detecting busbar voltage, sends into microprocessor with the sampling result.
According to the utility model discloses a further aspect, three-phase alternating voltage detection circuitry contains sampling unit, filtering unit and comparator, sampling unit adopts two liang of difference amplifier circuit of resistance series connection step-down, filtering unit adopts batworth second order low pass filter, the comparator adopts voltage comparator for with sinusoidal synchronous voltage signal transform become with the square wave signal of three-phase alternating current power supply with the same frequency, judge the phase sequence of inserting three-phase electricity when being used for the system self-checking.
According to the utility model discloses a further aspect, drive circuit comprises buffer, driver chip and pulse transformer, the buffer adopts tristate buffer protector, driver chip adopts the power amplification chip, pulse transformer adopts high frequency pulse transformer.
According to another aspect of the invention, the microprocessor is a digital signal processor.
(III) advantageous effects
The above technical scheme of the utility model following profitable technological effect has, because bus voltage rises gently, so can not arouse too big electric current impact at the soft start-up in-process of rectification system. And the utility model discloses save soft start relay and pre-charge resistance, reduced mechanical contact, reduced the volume, strengthened the reliability.
Drawings
FIG. 1 is a schematic diagram of a soft start circuit of an uncontrolled rectifying system in the prior art;
fig. 2 is a block diagram illustrating an overall structure of a soft start system of a servo driver according to the present invention;
fig. 3 is a schematic diagram of a soft start process according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 2 shows an example of an overall structure block diagram of a servo driver soft start system, which includes a three-phase bridge type half-controlled rectification circuit 10, a filter circuit 11, a bus voltage detection circuit 12, a three-phase alternating voltage detection circuit 13, a thyristor drive circuit 14, and a digital signal processor 15 (i.e., a microprocessor).
The three-phase bridge type semi-controlled rectifying circuit 10 is formed by connecting a three-phase half-wave uncontrolled rectifying circuit and a three-phase half-wave controlled rectifying circuit in series, wherein the three-phase half-wave uncontrolled rectifying circuit is formed by connecting three anodes together, and the connected anodes are used as the negative pole of the output end of the three-phase bridge type semi-controlled rectifying circuit, namely the negative pole of a direct current bus; the three-phase half-wave controllable rectifying circuit consists of three thyristors with connected cathodes, wherein the connected cathodes are used as the positive electrode of the output end of the three-phase bridge type half-controlled rectifying circuit, namely the positive electrode of the direct current bus; the positive pole of the direct current bus and the negative pole of the direct current bus form direct current bus voltage. The connection point of the three-phase half-wave uncontrolled rectifying circuit and the three-phase half-wave controlled rectifying circuit is used as the input end of the three-bridge type half-controlled rectifying circuit to be connected with a three-phase alternating current input power supply. The circuit has both controllable and uncontrollable characteristics, and for three thyristors with common cathode, the anode potential is higher and the thyristors to which the trigger pulse is applied are turned on. For three common anode rectifier diodes, the rectifier diode with the lowest cathode potential conducts. By adjusting the trigger angle of the thyristor, the direct-current bus voltage with any value from zero to the three-phase peak voltage can be obtained.
The filter circuit 11 is composed of one or more groups of electrolytic capacitors connected in series in pairs, the electrolytic capacitors are connected in parallel between the positive electrode of the direct current bus and the negative electrode of the direct current bus, and the filter circuit realizes a filter function by charging and discharging of energy of the electrolytic capacitors, so that voltages at two ends of the direct current bus are smooth.
The bus voltage sampling circuit 12 is connected to the output end of the three-phase bridge semi-controlled rectifying circuit 10, and is used for detecting the dc bus voltage and sending the sampling signal to the digital signal processor 15. The bus voltage sampling circuit comprises a voltage divider and a bus voltage detection module. The voltage divider is composed of two or more resistors connected in series and is used for dividing the bus voltage so as to detect the bus voltage.
The digital signal processor 15 is used for collecting an alternating current/direct current voltage signal and timely controlling the conduction of the thyristor to realize the soft start function of the semi-controlled rectification system, specifically generates an actual direct current bus voltage value after amplifying a sampling signal sent by the bus voltage sampling circuit 12 by a certain multiple, and determines whether to start or finish the soft start by matching with the three-phase alternating current voltage detection circuit 13.
The input end of the three-phase ac voltage detection circuit 13 is connected to a three-phase ac input power supply, and is used for detecting the three-phase ac input voltage. The three-phase alternating voltage detection circuit comprises a sampling unit, a filtering unit and a comparator. The sampling unit adopts a resistance series voltage reduction pairwise differential amplification circuit and is used for sampling three-phase alternating current input voltage. The filtering unit adopts Butterworth second-order low-pass filtering and is used for inhibiting differential mode interference. The comparator is a voltage comparator and is used for converting the sine synchronous voltage signal into a square wave signal with the same frequency as the three-phase alternating-current power supply and judging the phase sequence of the accessed three-phase power during system self-checking. The three-phase alternating current is subjected to difference between every two alternating currents after being subjected to voltage division by the resistors, and then the operational amplifier chip is used for second-order low-pass filtering to obtain a sampling signal with higher harmonics filtered out. In order to meet the input requirement of 0-3V of an AD sampling port of the DSP, 1.5V direct current bias voltage is superposed on the signal, and a three-phase voltage sampling signal with the bias of 1.5V is obtained after amplitude limiting. This sampled signal is fed to the digital signal processor 15. The digital signal processor 15 amplifies the collected signal sent by the three-phase alternating voltage detection circuit 13 by a certain multiple to generate an actual three-phase alternating voltage value, and determines whether the thyristor of the three-phase bridge type half-controlled rectification circuit 10 is triggered or not according to the actual three-phase alternating voltage value.
The input end of the thyristor driving circuit 14 is connected with the digital signal processor 15, and the output end is connected with the three-phase bridge type semi-controlled rectifying circuit 10. The thyristor driving circuit consists of a buffer, a driving chip and a pulse transformer. The buffer is a tri-state buffer protector used for preventing the thyristor from being triggered by mistake. The driving chip adopts a power amplification chip and is used for driving the thyristor to be conducted, and the driving capability of the circuit is enhanced. The power amplification chip is an insulated gate bipolar transistor (MOSFET). The pulse transformer is a high-frequency pulse transformer, and realizes the isolation between the main loop and the control loop.
The trigger pulse output by the digital signal processor 15 is sent to the thyristor drive circuit 14 to control the conduction of the MOSFET to generate square wave voltage at the primary side of the pulse transformer, the square wave voltage generates drive pulse at the secondary side of the pulse transformer, and the output end of the drive pulse is sent to the control end of the three-phase half-wave controllable rectifying circuit in the three-phase bridge type half-controlled rectifying circuit 10 to drive the conduction of the thyristor.
The digital signal processor 15 is respectively connected with the output end of the three-phase alternating voltage detection circuit 13 and the sampling signal output end of the bus voltage sampling circuit 12, a trigger signal is generated after operation and processing are carried out on the sampling signal output by the three-phase alternating voltage detection circuit 13 and the sampling signal output by the bus voltage sampling circuit 12, and the trigger signal controls the three-phase half-wave controllable rectifying circuit of the three-phase bridge type semi-controlled rectifying circuit 10 through the thyristor driving circuit 14, so that the charging of the filter circuit 11 is realized.
Fig. 3 is a schematic diagram of a soft start process provided by an embodiment of the present invention, including:
step S1: setting a soft-start initial voltage value VREF1, a first preset voltage value VREF2 and a second preset voltage value VREF 3.
When setting the initial soft-start voltage value VREF1 and the first preset voltage value VREF2, consideration needs to be given to keeping the charging current within a safe range, and the magnitude of the charging current mainly depends on the subdivision degree of the charging voltage in the program and the circuit characteristics of the power system hardware. In the whole process of charging the energy storage circuit, the maximum value of the charging current is the peak value of the charging current in the first charging process after the initial voltage of the soft start is adjusted. According to the selected parameters, the soft start initial voltage value and the first preset voltage value VREF2 are set. The second preset voltage value is smaller than the amplitude of the voltage value of the direct current bus of the driving circuit in normal operation.
Step S2: and judging whether each phase voltage is in a corresponding soft start area.
The soft start region of each phase voltage is a crest reduction section of each phase voltage. When the ac voltage value of each phase exceeds 0.9 times the peak voltage value Upeak, the phase voltage over-peak flag bit is set to 1, and Upeak represents the three-phase ac input peak voltage. Once the voltage over-peak flag bits of two adjacent phases are all 1 and the ac voltage value of the previous waveform is less than 0.5Upeak, the phase voltage waveform is considered to enter the corresponding soft start region. And when the alternating voltage value of each phase is negative, clearing the zone bit.
Step S3: and comparing the alternating current voltage value with the soft start initial voltage value, and driving the thyristors of each phase to be conducted if the alternating current voltage value of each phase is smaller than the soft start initial voltage value.
Extracting 3 detectable phase voltages Uuv, Uvw and Uwu from a three-phase alternating current power grid through a resistor voltage division and differential amplification link; and sending the detection voltages Uuv, Uvw and Uwu of each phase to a digital signal processor, comparing the alternating voltage value with the soft start initial voltage value by the processor, and if the alternating voltage value of each phase is less than the soft start initial voltage value, giving a trigger signal by the processor to drive each phase thyristor of the three-phase bridge type semi-controlled rectifying circuit to be conducted so as to charge a filter capacitor of the filter circuit.
Step S4: and comparing the actual bus voltage value with the soft start initial voltage value, and resetting the soft start initial voltage value.
The method comprises the steps of extracting 1 detectable bus voltage Udc from a direct current bus through a link of resistance voltage division and isolation amplification, sending the bus voltage Udc to a digital signal processor, comparing the bus voltage value with a soft start initial voltage value by the digital signal processor, and if the actual bus voltage value Udc is equal to the soft start initial voltage value VREF1, setting the soft start initial voltage value VREF1 to be the sum of the current soft start initial voltage value VREF1 and a first preset voltage VREF2, namely VREF1 is VREF1+ VREF 2.
Step S5: and comparing the actual bus voltage value with a second preset voltage value, and judging whether the soft start is finished.
And when the actual bus voltage value Udc rises to a second preset voltage value VREF3, the soft start is finished and the normal working state is switched. At this time, the state that the conduction angle is zero in normal operation is switched to, and excessive surge of the charging current is not caused.
The invention is further described below with reference to a specific embodiment.
Assuming that the initial real bus voltage Udc is 0V, the soft start initial voltage VREF1 is set to 10V, the first preset voltage VREF2 is 10V, and the second preset voltage VREF3 is 500V. Once the phase voltage in the soft start area is monitored to be lower than VREF1, the digital signal processor 15 gives a trigger signal to trigger the corresponding thyristors in the three-phase half-wave controllable rectifying circuit of the three-phase bridge type half-controlled rectifying circuit 10 to be conducted, so as to charge the filter capacitor, and after several times of such charging processes, the voltage value Udc of the direct-current bus rises to 10V. After the bus voltage value Udc rises to 10V, VREF1 is set to be the sum (set value 10V) of the current soft start initial voltage value VREF1 (set value 10V) and the first preset voltage value VREF2, that is, VREF1 is 20V, each phase voltage value is determined in the next period, once each phase voltage value in the soft start area is lower than VREF1 at this time, the digital signal processor 15 gives the trigger signal again to trigger the thyristor to be turned on, and the filter capacitor is charged, and the cycle is repeated. When the voltage of each phase during triggering is continuously increased according to the VREF1 value, the actual bus voltage value Udc is continuously increased, and when the actual bus voltage value Udc is increased to a second preset voltage value VREF3 (the set value is 500V), the three-phase bridge type semi-controlled rectifying circuit 10 can be safely switched to a state that the thyristor conduction angle is zero during normal operation, and the soft start process is finished. Because the bus voltage rises smoothly, excessive current impact cannot be caused in the soft start process of the rectifying system.
To sum up, the utility model provides a servo driver soft start control system, this system include half accuse rectifier circuit of three-phase bridge type, filter circuit, busbar voltage detection circuitry, three-phase alternating voltage detection circuitry, drive circuit and microprocessor. The method comprises the following steps: acquiring an initial value of a soft start voltage, and judging whether a certain phase in three-phase power is in a corresponding soft start area; when the processor detects that a certain phase in the three-phase power is in a corresponding soft start region, comparing the actual phase voltage of the phase with the initial value of the soft start voltage, and judging whether the current phase voltage is smaller than the initial value of the soft start voltage; and when the phase voltage value is lower than the initial soft start voltage value, triggering the corresponding thyristor, and conducting the thyristor to charge the filter capacitor until the voltages at the two ends of the thyristor are negative and the thyristor is automatically cut off. After several cycles of such charging process, the voltage value of the direct current bus can reach the initial value of the soft start voltage. At the moment, the initial value of the boost soft start voltage is the sum of the previous initial value of the soft start voltage and the first preset voltage value, and the soft start system can start to charge the filter capacitor at a higher voltage position during the next charging; and when the bus voltage value is detected to be larger than the second preset voltage value, ending the soft start process. The utility model discloses a charging process is not influenced by the fluctuation of electric wire netting, and is more steady reliable, has saved soft start relay and pre-charge resistance, has reduced mechanical contact, has reduced the volume, has strengthened the reliability.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A soft start system of a servo driver is characterized by comprising a three-phase bridge type half-control rectifying circuit, a filter circuit, a bus voltage detection circuit, a three-phase alternating voltage detection circuit, a driving circuit and a microprocessor;
the three-phase bridge type semi-controlled rectifying circuit is connected with a three-phase alternating current input power supply and a filter circuit; the three-phase alternating voltage detection circuit detects three-phase alternating voltage at the input end of the three-phase bridge type semi-controlled rectification circuit, the bus voltage detection circuit detects direct-current bus voltage at the output end of the three-phase bridge type semi-controlled rectification circuit, and the bus voltage detection circuit and the three-phase alternating voltage detection circuit are both connected with the microprocessor; and the microprocessor controls the three-phase bridge type semi-controlled rectifying circuit through the driving circuit.
2. The soft start system of claim 1, wherein the three-phase bridge semi-controlled rectifying circuit comprises a three-phase half-wave uncontrolled rectifying circuit and a three-phase half-wave controlled rectifying circuit.
3. The soft start system of claim 2, wherein said three-phase half-wave uncontrolled rectifying circuit comprises three rectifying diodes with their anodes connected together, and the connected anodes are used as the negative pole of the output terminal of the three-phase bridge half-controlled rectifying circuit, i.e. the negative pole of the dc bus.
4. The soft start system of claim 2, wherein the three-phase half-wave controllable rectifier circuit comprises three thyristors with connected cathodes, the connected cathodes being the positive electrode of the output terminal of the three-phase bridge type half-controlled rectifier circuit, i.e. the positive electrode of the dc bus.
5. The soft start system of claim 1, wherein the filter circuit comprises at least one or more sets of filter capacitors connected in series, the filter capacitors comprising electrolytic capacitors.
6. The soft start system of claim 1, wherein the bus voltage sampling circuit comprises a voltage divider and a bus voltage detection module, the voltage divider is composed of two or more resistors connected in series, and the bus voltage detection module is used for detecting the bus voltage and sending the sampling result to the microprocessor.
7. The soft start system according to claim 1, wherein the three-phase alternating voltage detection circuit comprises a sampling unit, a filtering unit and a comparator, the sampling unit adopts a resistance series connection voltage reduction pairwise differential amplifying circuit, the filtering unit adopts butterworth second-order low-pass filtering, and the comparator adopts a voltage comparator, is used for converting a sine synchronous voltage signal into a square wave signal with the same frequency as a three-phase alternating current power supply, and is used for judging the phase sequence of an accessed three-phase power during system self-test.
8. The soft start system of claim 1, wherein the driving circuit is composed of a buffer, a driving chip and a pulse transformer, the buffer adopts a tri-state buffer protector, the driving chip adopts a power amplification chip, and the pulse transformer adopts a high-frequency pulse transformer.
9. The soft start system of claim 1, wherein the microprocessor is a digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020348123.5U CN212086060U (en) | 2020-03-18 | 2020-03-18 | Servo driver soft start system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020348123.5U CN212086060U (en) | 2020-03-18 | 2020-03-18 | Servo driver soft start system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212086060U true CN212086060U (en) | 2020-12-04 |
Family
ID=73562499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020348123.5U Active CN212086060U (en) | 2020-03-18 | 2020-03-18 | Servo driver soft start system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212086060U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381625A (en) * | 2021-08-13 | 2021-09-10 | 天津飞旋科技股份有限公司 | Soft start rectification circuit, control panel, control method and frequency converter |
-
2020
- 2020-03-18 CN CN202020348123.5U patent/CN212086060U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381625A (en) * | 2021-08-13 | 2021-09-10 | 天津飞旋科技股份有限公司 | Soft start rectification circuit, control panel, control method and frequency converter |
| CN113381625B (en) * | 2021-08-13 | 2021-10-29 | 天津飞旋科技股份有限公司 | Soft start rectification circuit, control panel, control method and frequency converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111313676A (en) | Servo driver soft start system and control method thereof | |
| US9112374B2 (en) | Converter and method for extracting maximum power from piezo vibration harvester | |
| CN102291085B (en) | Asynchronous motor frequency converter device with low-voltage ride through capability | |
| CN109889073B (en) | Drive control circuit and household electrical appliance | |
| CN103328987A (en) | Polarity detection circuit | |
| CN105703689A (en) | High-power brushless doubly-fed machine three-level bidirectional variable-frequency speed regulation system | |
| CN108233785A (en) | Electric tool | |
| CN212086060U (en) | Servo driver soft start system | |
| CN109617445B (en) | DC side charging soft start circuit and method for five-level converter | |
| CN104362720A (en) | Storage battery charging system | |
| CN202475293U (en) | Three-phase voltage pulse width modulation rectifier | |
| CN110190760B (en) | High-voltage generator rectifying device | |
| CN212343313U (en) | Overvoltage protection circuit of switching power supply and switching power supply | |
| CN112753160B (en) | Direct power converter and control device | |
| CN112710901A (en) | Direct current bus capacitance detection circuit and method | |
| CN113037155B (en) | Rectification voltage stabilizing device of permanent magnet synchronous generator and control method | |
| CN214750546U (en) | Direct-current ground insulation impedance detection circuit for bridge arm topology converter | |
| CN104362717A (en) | Storage battery charging system | |
| CN109889031B (en) | Operation control method, device, circuit, household appliance and computer storage medium | |
| CN110011529B (en) | Operation control method, device, circuit, household appliance and computer storage medium | |
| CN112953189A (en) | Charging device | |
| CN202364130U (en) | Frequency conversion power supply device of controllable rectification unit | |
| CN218829605U (en) | Soft start circuit of UPS relay | |
| CN108808838A (en) | More power module control method for coordinating of high-frequency isolation warship AC power | |
| Koo et al. | Threshold point calculation method using instantaneous phase current for switch fault diagnosis of AC-DC converters in hybrid grid systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |