CN110968007A - Wide-range digital output board card for industrial field - Google Patents
Wide-range digital output board card for industrial field Download PDFInfo
- Publication number
- CN110968007A CN110968007A CN201911287479.0A CN201911287479A CN110968007A CN 110968007 A CN110968007 A CN 110968007A CN 201911287479 A CN201911287479 A CN 201911287479A CN 110968007 A CN110968007 A CN 110968007A
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- voltage
- mosfet
- power supply
- 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.)
- Pending
Links
- 238000002955 isolation Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000002452 interceptive effect Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000001052 transient effect Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a wide-range digital output board card for an industrial field, which comprises: the digital quantity output circuit, the isolation power supply circuit, the short-circuit protection circuit and the over-current detection circuit are formed by multiple paths; the digital quantity output circuit is composed of a plurality of paths, receives PWM and CAN interactive data with certain frequency, controls the on and off of the MOSFET according to the received data signal and outputs digital quantity voltage information; and the isolation power supply circuit compares the PWM with fixed frequency output by the digital output circuit with the data received by the CAN protocol controller, and performs voltage doubling processing on the voltage data to obtain isolation voltage so as to control the output of the chip. The circuit is produced by the formation of an isolated power supply 2
The power consumption of the circuit is reduced by controlling the digital quantity output through controlling the power supply; the application of short-circuit protection and overcurrent protection in the circuit improves the reliability of the application of the whole circuit.
Description
Technical Field
The invention relates to the field of logic circuit control, in particular to a wide-range digital output board card for an industrial field.
Background
The digital quantity output board card is an important component of an LCU (logical Control Unit) and is responsible for controlling the on-off of a contactor of a subway vehicle. Data exchange is carried out by adopting a processor STM32F107 and a CAN (controller area Network) communication medium integrated with a back plate, the output of the isolated power supply voltage is controlled by the generated PWM (Pulse width modulation), the external equipment is controlled by controlling the power supply so as to control the on-off of an MOSFET (metal-oxide semiconductor field effect transistor), and the controller has overcurrent protection and short-circuit protection. The stability of the system is related to the stability and reliability of the whole LCU, and the system plays a significant role in the safe operation of subway trains.
At present, in a subway train control system, a contactor on a subway train is mainly controlled by driving a solid-state relay or a mechanical relay, and as shown in fig. 1, the solid-state relay is driven. U1 is a solid relay, and the signal O1 through the controller controls the make-and-break of U1 through inverter U1F, and F1 is the self-resuming fuse that suppresses U1 overcurrent, and output interface OUT1 is the output line that connects the load. Meanwhile, when the U1 is switched on, the output voltage forms stable current through the R4 and the DZ2 and flows through the 1 pin and the 2 pin of the U2, so that the 4 pin and the 3 pin of the U2 are switched on and off, and a feedback signal is transmitted to the controller, so that the on-off state of the U1 is judged. However, as shown in fig. 1, the mechanical relay and the solid-state relay used in the circuit board stage have a small current at a high voltage; the amount of the organic solvent is usually 1A to 2A. Meanwhile, when the current of the solid-state relay is large, the temperature is high, and the working temperature of the solid-state relay is-40-85 ℃. The solid-state relay and the mechanical relay are not provided with a peripheral protection circuit and can be damaged once short circuit occurs. And the self-recovery fuse can reduce the service life of the fuse during each overcurrent. Solid state relays are expensive and cannot be repaired, while mechanical relays can be oxidized to be disconnected after long-term operation.
At present, a MOSFET is used for replacing a relay to control a large-scale contactor on a train, the principle of the MOSFET is that as shown in fig. 2, an optocoupler U1 drives a Q1MOSFET, charging and discharging of a capacitor C1 are formed according to the on and off of the MOSFET, and the 3 and 4 pins of a U2 are conducted through charging and discharging of C1, so that on and off monitoring of the MOSFET is formed. And a load is applied between BAT + and OUT2 to form a common cathode loop for the multi-channel digital output unit. However, the external output line forms a fixed wiring mode, the use diversity of users is inconvenient, the protection circuit of the MOSFET is single, only the fuse is used for overcurrent protection, the energy borne by the fuse is insufficient to meet the working condition for the load with extremely large instantaneous current, and meanwhile, the input end needs to be kept supplying power for a long time
Disclosure of Invention
According to the problems in the prior art, the invention provides a wide-range voltage output structure, a connection mode of an output end can be selected at will, a common anode and a common cathode are simultaneously supported, and an industrial field control digital output board card with short-circuit protection and overcurrent protection is provided, and the specific scheme is as follows:
a wide range digital output integrated circuit board for industrial field includes
The digital quantity output circuit, the isolation power supply circuit, the short-circuit protection circuit and the over-current detection circuit are formed by multiple paths;
the digital quantity output circuit receives PWM and CAN interactive data with certain frequency, controls the on and off of the MOSFET according to the received data signal and outputs digital quantity voltage information;
the isolation power supply circuit is used for carrying out data processing on the PWM with fixed frequency output by the digital output circuit and the data received by the CAN protocol controller so as to control the transformer, and carrying out voltage doubling processing on the control voltage so as to obtain isolation voltage so as to control the output of the voltage;
the short-circuit protection circuit compares the divided voltage output by the isolation power supply circuit with a voltage threshold value stored in the digital quantity output circuit so as to control the on and off of the MOSFET;
and the overcurrent detection circuit receives the transient current value of the detected inductor, converts the transient current value of the inductor into a voltage value, compares the voltage value, judges and outputs a high-low level signal.
Further, the digital quantity output circuit comprises a processing chip U1, an output pin of the processing chip U1 is connected with a MOSFET Q3, and the MOSFET Q3 is connected with an external load for controlling the operation of the load.
Further, the isolation power supply circuit comprises an and-gate chip U2, an input end of the and-gate chip U2 is configured to receive a PWM signal and a high level signal output by a CAN bus, an output end of the and-gate chip U2 is connected in parallel to a triode Q1 and a triode Q2, an emitter of the triode Q1 is connected to a capacitor C1, the capacitor C1 is connected to a transformer T1, an output end of the transformer T1 is connected in parallel to a diode D1 and a capacitor C2, the diode D1 is connected in parallel to a diode D2, and the capacitor C2 is connected in parallel to a capacitor C3.
The short-circuit protection circuit comprises a diode D5, a first resistor R7 and a second resistor R9, wherein the first resistor R7 and the second resistor R9 are connected in parallel, one end of the first resistor R7 is connected with a diode D5, and the diode D5 is connected with the D end of the drain electrode of the MOSFET Q3;
the overcurrent detection circuit comprises a current sensor U3, a detection inductor T2, a comparator U4 and an inverter U5, wherein the source S end of the MOSFET Q3 is connected with the detection inductor T2, the detection inductor T2 is connected with the current sensor U3, the output end of the current sensor U3 is connected with a comparator U4, and the output end of the comparator U4 is connected with the inverter U5.
Due to the adoption of the technical scheme, the wide-range digital output board card for the industrial field adopts a discrete device building circuit and a digital output circuit with wide-range voltage, increases the current of the output circuit, and simultaneously solves the problems of short circuit and overcurrent protection of the digital output circuit; the reliability and the stability of the digital quantity output circuit are improved, and the standby power consumption is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic circuit diagram of a prior art solid state relay;
FIG. 2 is a schematic diagram of a prior art circuit for driving a Q1 MOSFET;
FIG. 3 is a schematic circuit diagram of the output board card of the present invention;
fig. 4 is a schematic diagram of a specific circuit of the output board card of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention:
as shown in fig. 3 and 4, the wide-range digital output board card for the industrial field specifically includes a digital output circuit, an isolated power supply circuit, a short-circuit protection circuit, and an overcurrent detection circuit, which are formed by multiple paths.
The digital quantity output circuit adopts data received by the drive chip IR21271 to control the on and off of the MOSFET Q3, thereby realizing digital quantity output of wide-range voltage and having autonomous selection of cathode-sharing and anode-sharing of output lines.
The isolation power supply circuit adopts the fixed-frequency PWM sent by the processor and the data received by the CAN protocol controller to mutually interact to obtain the data, and the data passes through the isolation transformer and the voltage multiplication of the diode and the capacitor, so that the output of the isolation voltage is realized to control the output of the driving chip.
The short-circuit protection circuit is based on the fact that when the MOSFET is conducted, the product of an internal resistance value and a flowing current value is compared with a protection threshold value of the chip IR21271 after voltage division is carried out through the fast recovery diode, and after the protection threshold value is exceeded, the chip IR21271 does not control the MOSFET to conduct any more. Because the over-current has a slower rising slope than the short-circuit current, the over-current is much lower than the short-circuit current threshold value in order to prevent the over-current, and the device is prevented from being operated in an over-temperature burning mode for a long time. Therefore, the overcurrent protection is based on a board-level current sensor, the acquired current is converted into voltage and then is compared with a comparator and fed back to a processor, and the voltage is uploaded to a bus of the backboard through a CAN protocol controller.
As shown in FIG. 4, the voltage of pins 1 and 4 and pins 8 and 5 of the processing chip U1 are
The voltage value of the 2 pin of the processing chip is
The voltage value of the voltage regulator tube D4 is subtracted, meanwhile, the pin 7 of the U1 outputs high level to control the Q3 to be conducted, the external connection IN + of the Q3 is connected with the OUT1 IN series to control the load to work. When the reference level of data O1 interacted with the CAN bus is low, the output is low through an AND gate chip U2, the isolation power supply voltage cannot be established, and Q3 is in a disconnected state and a low power consumption state.
As shown in fig. 4, the digital output circuit is configured such that the processor STM32F107 transmits a PWM wave with a fixed frequency, when data O1 (reference level is high) of data interaction of the CAN bus is transmitted, the two pass through the and chip U2, SN74HC08DR CAN be selected, but the two do not belong to a uniquely specified chip, the output is consistent with PWM transmitted by the processor, Q1 is turned on to charge C1 when the PWM is high through the resistor R2, and the capacitor C1 is discharged to form a sine wave when the PWM is low. And has an amplitude of
When the sine wave of the pins 4 and 6 of the transformer T1 is in the positive half cycle, the diode D1 is turned on, the D2 is turned off, the capacitor C2 is charged, and the voltage value of the C2 is equal to
When the sine wave of the 4.6 pin of T1 is at the negative half-shaft, D1 is cut off, D2 is turned on to charge the C3 capacitor, and the voltage value of C3 is
Therefore, electricity between the two ends T1+ and T1-of the resistor R4A pressure value of
Forming an isolated power output.
When the CAN bus interaction data O1 is high, the output load is short-circuited or the line is misconnected, short-circuit current is formed, the voltage drop generated by the short-circuit current and D5, R7 and R9 form a loop through Q3, and the voltage value of X is the sum of the voltage drop of Q3 and the voltage drop of a diode D5. After the voltage of the Y value is divided by the R7 and the R9, the voltage exceeds the threshold value of 1.8V of the 6 pins of the U1, the U1 of the chip locks the 7 pin output, the level is reduced to zero, and the Q3 is disconnected. When the load short circuit is eliminated and the CAN bus interaction data is changed from low to high, the U1 releases the short circuit latch and the work is recovered to normal.
The current sensor U3 ACHS-7122 converts the current value into the voltage value by detecting the current change OF an inductor T2, because the current OF U3 corresponds to the voltage value OF 100mV/A, the voltage OF a pin 7 OF U3 is 2.5V when the current is zero, the capacitors C8 and C11 filter the output, the output voltage value is compared with the divided voltage values OF R14 and R13 through a U4 comparator LM193, when the output voltage value is higher than the divided voltage values, the comparator outputs high level, OF1 level output through an inverter U5 is changed into low level, and the low level is uploaded to a CAN bus through a processor. And the output voltage value is lower than the divided voltage value, the comparator output is low, and a high level is output through the inverter OF 1.
A wide-range digital output board card for industrial sites has the following specific working principle:
the data O1 which is sent by the processor and interacts with the CAN through PWM with certain frequency is and-operated through an AND gate chip U2, when O1 is at high level, the output of 8 pins of the AND gate chip U2 is consistent with the PWM, and then the data O1 is charged and discharged through a triode Q1 and a triode Q2 through a capacitor C1, when the PWM is at high level, the capacitor C1 is charged, and when the PWM is at low level, the capacitor is discharged to form a sine wave. Amplitude is and amplitude is
When the sine wave of the pins 4 and 6 of the transformer T1 is in the positive half cycle, the diode D1 is turned on, the diode D2 is turned off, the capacitor C2 is charged, and the voltage value of the C2 is equal to
When the sine wave of the pins 4 and 6 of the transformer T1 is at the negative half shaft, the diode D1 is cut off, the diode D2 is conducted to charge the capacitor C3, and the voltage value of the capacitor C3 is equal to
The voltage between the transformer T1+ and the transformer T1-across the resistor R4 is thus at a value of
When O1 is low, the voltages of T1+ and T1-are 0.
The voltage formed by T1+ and T1-supplies power to the processing chip U1, the voltage of pin 1 generates voltage at pin 2 of the processing chip U1 through D4, pin 7 of the processing chip U1 generates voltage at pin 2, then high level is output, MOSFET Q3 is controlled to be conducted, and therefore an output path is formed between IN + and OUT1, and the load works. When O1 is low, MOSFET Q3 is non-conductive, forming an output open circuit at IN + and OUT1, and the load is not active. The diode D5 is connected to the drain D of the MOSFET Q3, and the source S of the MOSFET Q3 is connected to the sense inductor T2. When O1 is high, stable PWM is output, and at the same time, when the load is in short circuit, a short-circuit current is formed to pass through the MOSFET Q3, so that the voltage drop generated by the short-circuit current forms a loop with the diode D5, the resistor R7 and the resistor R9, and the voltage value of X is the sum of the voltage drop of the MOSFET Q3 and the voltage drop of the diode D5. After the voltage of the Y value is divided by the resistor R7 and the resistor R9, the voltage exceeds the threshold value of 1.8V of the pin 6 of the processing chip U1, the processing chip U1 locks the pin 7 output, the MOSFET Q3 is not conducted, an output open circuit is formed between IN + and OUT1, and the load does not work. When the load short circuit is eliminated and the CAN bus interaction data is changed from low to high, the U1 releases the short circuit latch, the MOSFET Q3 is conducted, and an output path is formed between IN + and OUT1, so that the load works.
When the IN + and the OUT1 form a path, the U3 current sensor ACHS-7122 detects the current change OF the inductor T2, the 7-pin output voltage value converted by the current generated by the current formed by the IN + and the OUT1 through the current sensor U3 is higher than the divided voltage value OF the resistor R4 and the resistor R13, the comparator outputs high level, and the OF1 level output by the inverter U5 is changed into low level for overcurrent phenomenon and is uploaded to the CAN bus through the processor. And the output voltage value OF the pin 7 OF the current sensor U3 is lower than the divided voltage value, the output OF the comparator is low, and the high level is output through the inverter OF1, so that the input signal O1 is consistent with the feedback signal OF 1.
The wide-range digital output board card disclosed by the invention is generated by forming an isolated power supply
The power consumption of the circuit is reduced by controlling the digital quantity output through controlling the power supply; the application of short-circuit protection and overcurrent protection in the circuit improves the reliability of the application of the whole circuit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A wide range digital output integrated circuit board for industrial field, its characterized in that includes: the digital quantity output circuit, the isolation power supply circuit, the short-circuit protection circuit and the over-current detection circuit are formed by multiple paths;
the digital quantity output circuit receives PWM and CAN interactive data with certain frequency, controls the on and off of the MOSFET according to the received data signal and outputs digital quantity voltage information;
the isolation power supply circuit is used for carrying out data processing on the PWM with fixed frequency output by the digital output circuit and the data received by the CAN protocol controller so as to control the transformer, and carrying out voltage doubling processing on the control voltage so as to obtain isolation voltage so as to control the output of the voltage;
the short-circuit protection circuit compares the divided voltage output by the isolation power supply circuit with a voltage threshold value stored in the digital quantity output circuit so as to control the on and off of the MOSFET;
and the overcurrent detection circuit receives the transient current value of the detected inductor, converts the transient current value of the inductor into a voltage value, compares the voltage value, judges and outputs a high-low level signal.
2. The wide-range digital output board card for the industrial field according to claim 1, further characterized in that: the digital quantity output circuit comprises a processing chip U1, wherein an output pin of the processing chip U1 is connected with a MOSFET Q3, and the MOSFET Q3 is connected with an external load for controlling the operation of the load.
3. The wide-range digital output board card for the industrial field according to claim 1, further characterized in that: the isolation power supply circuit comprises an AND gate chip U2, wherein an input end of the AND gate chip U2 is used for receiving PWM signals and high-level signals output by a CAN bus, an output end of the AND gate chip U2 is connected with a triode Q1 and a triode Q2 in parallel, an emitter of the triode Q1 is connected with a capacitor C1, the capacitor C1 is connected with a transformer T1, an output end of the transformer T1 is connected with a diode D1 and a capacitor C2 in parallel, the diode D1 is connected with a diode D2 in parallel, and the capacitor C2 is connected with a capacitor C3 in parallel.
4. The wide-range digital output board card for the industrial field according to claim 1, further characterized in that: the short-circuit protection circuit comprises a diode D5, a first resistor R7 and a second resistor R9, wherein the first resistor R7 and the second resistor R9 are connected in parallel, one end of the first resistor R7 is connected with a diode D5, and the diode D5 is connected with the end D of the drain electrode of a MOSFET Q3.
5. The wide-range digital output board card for the industrial field according to claim 1, further characterized in that: the overcurrent detection circuit comprises a current sensor U3, a detection inductor T2, a comparator U4 and an inverter U5, wherein the source S end of the MOSFET Q3 is connected with the detection inductor T2, the detection inductor T2 is connected with the current sensor U3, the output end of the current sensor U3 is connected with a comparator U4, and the output end of the comparator U4 is connected with the inverter U5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911287479.0A CN110968007A (en) | 2019-12-14 | 2019-12-14 | Wide-range digital output board card for industrial field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911287479.0A CN110968007A (en) | 2019-12-14 | 2019-12-14 | Wide-range digital output board card for industrial field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110968007A true CN110968007A (en) | 2020-04-07 |
Family
ID=70034206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911287479.0A Pending CN110968007A (en) | 2019-12-14 | 2019-12-14 | Wide-range digital output board card for industrial field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110968007A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN104332945A (en) * | 2014-10-30 | 2015-02-04 | 深圳市汇川技术股份有限公司 | High-speed digital output circuit with overcurrent protection and integrated circuit |
| CN106026621A (en) * | 2016-07-19 | 2016-10-12 | 武汉理工大学 | IGBT drive circuit for preventing short circuit protection blind area and detection method |
-
2019
- 2019-12-14 CN CN201911287479.0A patent/CN110968007A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593788A (en) * | 2012-03-28 | 2012-07-18 | 桂林航天电子有限公司 | Short circuit/ overcurrent protection controller and operation method |
| CN104332945A (en) * | 2014-10-30 | 2015-02-04 | 深圳市汇川技术股份有限公司 | High-speed digital output circuit with overcurrent protection and integrated circuit |
| CN106026621A (en) * | 2016-07-19 | 2016-10-12 | 武汉理工大学 | IGBT drive circuit for preventing short circuit protection blind area and detection method |
Non-Patent Citations (2)
| Title |
|---|
| 席赫: "《基于ARM 的数字量输出单元设计与实现》", 《电子技术与软件工程》 * |
| 马维华: "《一种高可靠多舵机控制***设计》", 《电力电子技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102111070B (en) | The regulator over-voltage protection circuit that standby current reduces | |
| CN101527990B (en) | Light emitting diode driving circuit | |
| CN102013802B (en) | BOOST circuit with short circuit protection function | |
| CN102291000A (en) | Switch power supply integrated circuit | |
| CN116094143B (en) | Power voltage detecting system | |
| CN208874344U (en) | Main power source and backup power source switching circuit and switching device | |
| CN103051178A (en) | Buck converter for detecting and stopping reverse current | |
| CN105322810A (en) | Power conversion device and protection method thereof when current feedback signal is abnormal | |
| CN103050932A (en) | Electronic switch circuit for power over Ethernet | |
| CN102778849B (en) | Switching on and shutting down control circuit, electronic equipment and on-off control method | |
| CN117277787B (en) | High-voltage wide-voltage-range input power DC-DC converter and control method | |
| CN117394671A (en) | Energy-taking power supply topology and method for series connection application of energy-taking power supply topology and power module voltage-equalizing resistor | |
| WO2006136100A1 (en) | Power supplying device and power supplying method | |
| CN113972817B (en) | Solid-state transformer fault handling system | |
| CN204068210U (en) | Short-circuit protection circuit | |
| CN110968007A (en) | Wide-range digital output board card for industrial field | |
| CN212969038U (en) | Overvoltage protection circuit and electronic equipment | |
| CN111883085B (en) | Device for improving stable work of liquid crystal equipment | |
| CN100373730C (en) | Switch power source short circuit protection method and circuit | |
| CN210629083U (en) | Electric leakage protection device and electric equipment | |
| CN206992680U (en) | Undervoltage protection circuit | |
| CN203279299U (en) | Led drive circuit system and controller | |
| CN219107047U (en) | Power supply system protection circuit and power supply system | |
| CN204498101U (en) | The alternating current-direct current self adaptation of microcomputer protecting device opens entry loop | |
| CN114039406B (en) | Power supply circuit and flexible direct current transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200407 |
|
| RJ01 | Rejection of invention patent application after publication |