CN103956708A - Overload measurement and control circuit for low-voltage direct current load - Google Patents
Overload measurement and control circuit for low-voltage direct current load Download PDFInfo
- Publication number
- CN103956708A CN103956708A CN201410160375.4A CN201410160375A CN103956708A CN 103956708 A CN103956708 A CN 103956708A CN 201410160375 A CN201410160375 A CN 201410160375A CN 103956708 A CN103956708 A CN 103956708A
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage
- comparator
- output
- circuit
- 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.)
- Granted
Links
Landscapes
- Control Of Voltage And Current In General (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention relates to an overload measurement and control circuit for a low-voltage direct current load. The overload measurement and control circuit for the low-voltage direct current load comprises a driver DR, a direct current load DL, a thyristor VT1, an MOS tube VT2, a voltage stabilizer tube DW1, a voltage limiting tube DW2, a comparator IC1, an inductor L1, a diode D1, a power source light LED1, an output lamp LED2, a voltage stabilizer resistor R1, an anode resistor R2, a grid resistor R3, an output resistor R4, a gate resistor R5, a voltage stabilizer capacitor C1, a filter capacitor C2, a setting capacitor C3 and the like. According to the overload measurement and control circuit for the low-voltage direct current load, a power field-effect tube with ultralow on-resistance is utilized as a current detecting element and a circuit turn-off control element, the semi-control characteristic of the thyristor, the trace inductor connected in a load circuit and a quick judging circuit are combined, and real-time detection, judgment and safety control over the overload and short-circuit faults of the low-voltage direct current load are achieved. The overload measurement and control circuit for the low-voltage direct current load is simple in structure, safe, reliable and low in cost.
Description
Technical field
The invention belongs to industrial measurement and control field, relate to a kind of circuit, particularly a kind of low-voltage direct load overload telemetry circuit, is applicable to carry out detecting in real time and the occasion of safety protection control to the overload of low-voltage direct load or short trouble.
Background technology
Giving in the power supply of low-voltage direct load with DC driven power supply (also claiming driver); often occur to damage DC driven power supply and load itself because of load overload or the phenomenon that is short-circuited; therefore, must carry out overload and short trouble to detect in real time and safety protection control.Conventional effective ways are at present: by responding Hall current sensor rapidly, load current is detected in real time, relatively judged; in the time exceeding secure threshold, send instruction; turn-off driver and send the instruction of reporting to the police, to realize the safeguard protection to driver, DC load.The problem that the method exists is: the one, and during because of load overload or short trouble, electric current is very large, therefore the power device capacity in driver will be got larger allowance, the range that is used for the Hall current sensor of short-circuit detecting also will select large more morely than running current, and this makes cost very high; The 2nd, for the short trouble that moment occurs, often have little time protection and just will cause the damage of internal drive power device.For this reason, the overload that research cost is low, safe and short trouble testing and control project have important technology and economic implications, and of many uses.
Summary of the invention
The object of the invention is the deficiency existing for prior art, propose a kind of low-voltage direct load overload telemetry circuit.This circuit utilizes the power field effect pipe (MOSFET) of ultralow conducting resistance, both as current measuring element, also turn-off control element as circuit simultaneously, in conjunction with half control characteristic and the micro-inductance being connected in series and the Quick circuit of thyristor, can realize that overload and short trouble to low-voltage direct load detects in real time, differentiation and security control in load circuit.
The present invention includes observing and controlling main circuit and overload judging circuit.
Observing and controlling main circuit comprises driver DR, inductance L 1, diode D1, DC load DL, power lights LED1, output lamp LED2, voltage-stabiliser tube DW1, pressure limiting pipe DW2, thyristor VT1, metal-oxide-semiconductor VT2, electric capacity of voltage regulation C1, voltage regulation resistance R1, anode resistance R2, resistance R3, output resistance R4, gate electrode resistance R5, divider resistance R6, positive output end+E end of driver DR and one end of inductance L 1, the negative electrode of diode D1, the anode of power lights LED1, one end of anode resistance R2, one end of resistance R3, the anodic bonding of output lamp LED2, negative output terminal-E of driver DR holds ground connection, and the negative electrode of power lights LED1 is connected with one end of voltage regulation resistance R1, the negative electrode of the other end of voltage regulation resistance R1 and voltage-stabiliser tube DW1, one end of electric capacity of voltage regulation C1, one end of pull-up resistor R7, one end of reference resistance R8, the positive power source terminal V+ end of comparator IC1 connects, the anode of voltage-stabiliser tube DW1, the equal ground connection of the other end of electric capacity of voltage regulation C1, the anode of the other end of anode resistance R2 and thyristor VT1, the negative electrode of pressure limiting pipe DW2, the other end of resistance R3, the gate terminal G end of metal-oxide-semiconductor VT2 connects, one end of the gate pole of thyristor VT1 and gate electrode resistance R5, one end of divider resistance R6 connects, the negative electrode of thyristor VT1, the other end of gate electrode resistance R5, the anode of pressure limiting pipe DW2 and the source terminal S of metal-oxide-semiconductor VT2 hold equal ground connection, the drain electrode end D end of metal-oxide-semiconductor VT2 and one end of output resistance R4, negative terminal-IN end of DC load DL, one end of detecting resistance R 11 connects, and the other end of output resistance R4 is connected with the negative electrode of output lamp LED2, anode+IN end of DC load DL and the other end of inductance L 1, the anodic bonding of diode D1.
Overload judging circuit comprises comparator IC1, pull-up resistor R7, reference resistance R8, set resistance R 9, filter resistance R10, detect resistance R 11, filter capacitor C2, set capacitor C 3, the ground end GND end ground connection of comparator IC1, positive input terminal IN+ end and the other end that detects resistance R 11 of comparator IC1, one end of filter resistance R10, one end of filter capacitor C2 connects, the other end of filter resistance R10, the equal ground connection of the other end of filter capacitor C2, the negative input end IN-end of comparator IC1 and the other end of reference resistance R8, set one end of resistance R 9, one end of setting capacitor C 3 connects, set the other end of resistance R 9, set the equal ground connection of the other end of capacitor C 3, the output OUT end of comparator IC1 and the other end of divider resistance R6, the other end of pull-up resistor R7 connects.
Beneficial effect of the present invention is as follows:
The present invention utilizes the power field effect pipe (MOSFET) of a ultralow conducting resistance, both as current measuring element, also turn-off control element as circuit simultaneously, in conjunction with half control characteristic and the micro-inductance being connected in series and the Quick circuit of thyristor, can realize that overload and short trouble to low-voltage direct load detects in real time, Quick and security control in load circuit.This circuit arrangement is simple in structure, safe and reliable, cost is low, applied range.
Brief description of the drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, low-voltage direct load overload telemetry circuit, comprises observing and controlling main circuit and overload judging circuit.
Observing and controlling main circuit comprises driver DR, inductance L 1, diode D1, DC load DL, power lights LED1, output lamp LED2, voltage-stabiliser tube DW1, pressure limiting pipe DW2, thyristor VT1, metal-oxide-semiconductor VT2, electric capacity of voltage regulation C1, voltage regulation resistance R1, anode resistance R2, resistance R3, output resistance R4, gate electrode resistance R5, divider resistance R6, positive output end+E end of driver DR and one end of inductance L 1, the negative electrode of diode D1, the anode of power lights LED1, one end of anode resistance R2, one end of resistance R3, the anodic bonding of output lamp LED2, negative output terminal-E of driver DR holds ground connection, and the negative electrode of power lights LED1 is connected with one end of voltage regulation resistance R1, the negative electrode of the other end of voltage regulation resistance R1 and voltage-stabiliser tube DW1, one end of electric capacity of voltage regulation C1, one end of pull-up resistor R7, one end of reference resistance R8, the positive power source terminal V+ end of comparator IC1 connects, the anode of voltage-stabiliser tube DW1, the equal ground connection of the other end of electric capacity of voltage regulation C1, the anode of the other end of anode resistance R2 and thyristor VT1, the negative electrode of pressure limiting pipe DW2, the other end of resistance R3, the gate terminal G end of metal-oxide-semiconductor VT2 connects, one end of the gate pole of thyristor VT1 and gate electrode resistance R5, one end of divider resistance R6 connects, the negative electrode of thyristor VT1, the other end of gate electrode resistance R5, the anode of pressure limiting pipe DW2 and the source terminal S of metal-oxide-semiconductor VT2 hold equal ground connection, the drain electrode end D end of metal-oxide-semiconductor VT2 and one end of output resistance R4, negative terminal-IN end of DC load DL, one end of detecting resistance R 11 connects, and the other end of output resistance R4 is connected with the negative electrode of output lamp LED2, anode+IN end of DC load DL and the other end of inductance L 1, the anodic bonding of diode D1.
Overload judging circuit comprises comparator IC1, pull-up resistor R7, reference resistance R8, set resistance R 9, filter resistance R10, detect resistance R 11, filter capacitor C2, set capacitor C 3, the ground end GND end ground connection of comparator IC1, positive input terminal IN+ end and the other end that detects resistance R 11 of comparator IC1, one end of filter resistance R10, one end of filter capacitor C2 connects, the other end of filter resistance R10, the equal ground connection of the other end of filter capacitor C2, the negative input end IN-end of comparator IC1 and the other end of reference resistance R8, set one end of resistance R 9, one end of setting capacitor C 3 connects, set the other end of resistance R 9, set the equal ground connection of the other end of capacitor C 3, the output OUT end of comparator IC1 and the other end of divider resistance R6, the other end of pull-up resistor R7 connects.
All devices including thyristor VT1, metal-oxide-semiconductor VT2, comparator IC1, voltage-stabiliser tube DW1, pressure limiting pipe DW2, power lights LED1, output lamp LED2 etc. used in the present invention all adopt existing matured product, can obtain by market.For example: thyristor adopts KP1-2, metal-oxide-semiconductor adopts IRF series N-channel MOS FET pipe, and comparator adopts high speed voltage comparator LMV7239, and voltage-stabiliser tube adopts BZX84-B5V1, pressure limiting pipe adopts IN4746A, and power lights, output lamp all adopt 3-5mm light-emitting diode etc.
Main circuit parameter matching relationship in the present invention is as follows:
In accompanying drawing 1, the driver outputting drive voltage U that the present invention is applicable
dscope is+10V～+ 100V, reference resistance R8, set resistance R 9, filter resistance R10, the parameter matching relationship that detects 11 of resistance R is suc as formula shown in (1), formula (2), filter capacitor C2, set 3 of capacitor C parameter matching relationship as the formula (3), wherein, U
wfor the voltage of voltage regulation (V) of voltage-stabiliser tube DW1, U
icurrent detection signal (V), U during for metal-oxide-semiconductor VT2 conducting
irfor current threshold setting signal (V), R
onfor metal-oxide-semiconductor VT2 conducting resistance (Ω), I
omfor overload and the max-thresholds electric current (A) of short-circuit protection.
U
i＝R
onI
om （2）
The course of work of the present invention is as follows:
In the time of driver DR outputting drive voltage, through the effect of voltage-stabiliser tube DW1, produce low pressure voltage of voltage regulation U
was the power supply taking comparator IC1 as main low-power consumption judging circuit, when cause has just powered on, no matter whether conducting of metal-oxide-semiconductor VT2, because making electric current, the effect of inductance L 1 can not suddenly change, now comparator IC1 output low level, and thyristor VT1 is in off state, therefore, metal-oxide-semiconductor VT2 conducting, after this, the possible running status of circuit is as follows:
(1) circuit state while normally work: DC load DL obtains electric work, and load circuit electric current I
obe less than and need protect the overload of control and the max-thresholds electric current I of short-circuit protection
om, comparator IC1 output low level always, thyristor VT1 is always in off state, and metal-oxide-semiconductor VT2 is also always in conducting state, and whole circuit is normally worked;
(2) circuit state while there is overload or short circuit: in the time there is overload or load end short trouble,, after driver DR output voltage and metal-oxide-semiconductor VT2 conducting, through the cushioning effect of inductance L 1, make load circuit electric current I
ocan not suddenly change, and work as I
orise to gradually max-thresholds electric current I
omtime, the output of comparator IC1 becomes high level from low level at once, and thyristor VT1 conducting, metal-oxide-semiconductor VT2 are also turn-offed because the voltage between its grid-source electrode becomes low level from high level, and this has just cut off contacting between driver DR and DC load DL in time, after this, although I
obe zero; make the output of comparator IC1 change to again low level, but due to the half control character (its gate pole can only be controlled conducting, can not control shutoff) of thyristor VT1; make metal-oxide-semiconductor VT2 keep off state, thereby realized the safety protection control to load overload or short trouble.
Claims (3)
1. low-voltage direct load overload telemetry circuit, comprises observing and controlling main circuit and overload judging circuit, it is characterized in that:
Observing and controlling main circuit comprises driver DR, inductance L 1, diode D1, DC load DL, power lights LED1, output lamp LED2, voltage-stabiliser tube DW1, pressure limiting pipe DW2, thyristor VT1, metal-oxide-semiconductor VT2, electric capacity of voltage regulation C1, voltage regulation resistance R1, anode resistance R2, resistance R3, output resistance R4, gate electrode resistance R5, divider resistance R6, positive output end+E end of driver DR and one end of inductance L 1, the negative electrode of diode D1, the anode of power lights LED1, one end of anode resistance R2, one end of resistance R3, the anodic bonding of output lamp LED2, negative output terminal-E of driver DR holds ground connection, and the negative electrode of power lights LED1 is connected with one end of voltage regulation resistance R1, the negative electrode of the other end of voltage regulation resistance R1 and voltage-stabiliser tube DW1, one end of electric capacity of voltage regulation C1, one end of pull-up resistor R7, one end of reference resistance R8, the positive power source terminal V+ end of comparator IC1 connects, the anode of voltage-stabiliser tube DW1, the equal ground connection of the other end of electric capacity of voltage regulation C1, the anode of the other end of anode resistance R2 and thyristor VT1, the negative electrode of pressure limiting pipe DW2, the other end of resistance R3, the gate terminal G end of metal-oxide-semiconductor VT2 connects, one end of the gate pole of thyristor VT1 and gate electrode resistance R5, one end of divider resistance R6 connects, the negative electrode of thyristor VT1, the other end of gate electrode resistance R5, the anode of pressure limiting pipe DW2 and the source terminal S of metal-oxide-semiconductor VT2 hold equal ground connection, the drain electrode end D end of metal-oxide-semiconductor VT2 and one end of output resistance R4, negative terminal-IN end of DC load DL, one end of detecting resistance R 11 connects, and the other end of output resistance R4 is connected with the negative electrode of output lamp LED2, anode+IN end of DC load DL and the other end of inductance L 1, the anodic bonding of diode D1,
Overload judging circuit comprises comparator IC1, pull-up resistor R7, reference resistance R8, set resistance R 9, filter resistance R10, detect resistance R 11, filter capacitor C2, set capacitor C 3, the ground end GND end ground connection of comparator IC1, positive input terminal IN+ end and the other end that detects resistance R 11 of comparator IC1, one end of filter resistance R10, one end of filter capacitor C2 connects, the other end of filter resistance R10, the equal ground connection of the other end of filter capacitor C2, the negative input end IN-end of comparator IC1 and the other end of reference resistance R8, set one end of resistance R 9, one end of setting capacitor C 3 connects, set the other end of resistance R 9, set the equal ground connection of the other end of capacitor C 3, the output OUT end of comparator IC1 and the other end of divider resistance R6, the other end of pull-up resistor R7 connects.
2. low-voltage direct load overload telemetry circuit as claimed in claim 1, it is characterized in that: described thyristor VT1, metal-oxide-semiconductor VT2, comparator IC1, voltage-stabiliser tube DW1, pressure limiting pipe DW2, power lights LED1, output lamp LED2 all adopts existing matured product, can obtain by market, described thyristor VT1 adopts KP1-2, metal-oxide-semiconductor VT2 adopts IRF series N-channel MOS FET pipe, comparator IC1 adopts high speed voltage comparator LMV7239, voltage-stabiliser tube DW1 adopts BZX84-B5V1, pressure limiting pipe DW2 adopts IN4746A, power lights LED1, output lamp LED2 all adopts 3-5mm light-emitting diode.
3. low-voltage direct load overload telemetry circuit as claimed in claim 1, is characterized in that: the driving voltage U of described driver DR output
dscope is+10V～+ 100V, reference resistance R8, set resistance R 9, filter resistance R10, the parameter matching relationship that detects 11 of resistance R is suc as formula shown in (1), formula (2), filter capacitor C2, set 3 of capacitor C parameter matching relationship as the formula (3), wherein, U
wfor the voltage of voltage regulation (V) of voltage-stabiliser tube DW1, U
icurrent detection signal (V), U during for metal-oxide-semiconductor VT2 conducting
irfor current threshold setting signal (V), R
onfor metal-oxide-semiconductor VT2 conducting resistance (Ω), I
omfor overload and the max-thresholds electric current (A) of short-circuit protection;
U
i＝R
onI
om （2）
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160375.4A CN103956708B (en) | 2014-04-21 | 2014-04-21 | Low-voltage direct load overload telemetry circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160375.4A CN103956708B (en) | 2014-04-21 | 2014-04-21 | Low-voltage direct load overload telemetry circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103956708A true CN103956708A (en) | 2014-07-30 |
| CN103956708B CN103956708B (en) | 2016-09-07 |
Family
ID=51333955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410160375.4A Active CN103956708B (en) | 2014-04-21 | 2014-04-21 | Low-voltage direct load overload telemetry circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103956708B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953402A (en) * | 2017-03-31 | 2017-07-14 | 杭州电子科技大学 | The magnetic powder brake driving continued a journey based on super capacitor and under-voltage protecting circuit |
| CN107196269A (en) * | 2017-06-27 | 2017-09-22 | 巢湖学院 | A kind of DC protection circuit and its guard method |
| CN108255222A (en) * | 2018-02-08 | 2018-07-06 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of control system of multichannel current loading |
| CN108880213A (en) * | 2018-07-19 | 2018-11-23 | 杭州电子科技大学 | A kind of super capacitor discharge protection circuit based on MOSFET observing and controlling |
| CN108899951A (en) * | 2018-07-19 | 2018-11-27 | 杭州电子科技大学 | Super capacitor two close cycles buck charging control circuit based on pressure stabilizing output type |
| CN109066946A (en) * | 2018-07-19 | 2018-12-21 | 杭州电子科技大学 | A kind of super capacitor two close cycles decompression charging control circuit based on pressure limiting tracking mode |
| CN109449905A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mine power resource guard grating quick closedown circuit |
| CN109617011A (en) * | 2018-11-29 | 2019-04-12 | 杭州电子科技大学 | One kind having earth leakage protective high voltage direct current solid-state relay circuit |
| CN109672432A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | A kind of MOSFET direct-current solid-state relay circuit with short-circuit protection |
| CN109672433A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | A kind of IGBT high voltage direct current solid-state relay circuit with short-circuit protection |
| CN109672431A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | One kind having earth leakage protective 3 phase AC solid relay circuit |
| CN113205942A (en) * | 2021-05-11 | 2021-08-03 | 南京科达新控仪表有限公司 | Permanent magnet synchronous motor follow current energy storage demagnetizing device and implementation method thereof |
| CN113644817A (en) * | 2021-08-13 | 2021-11-12 | 无锡市晶源微电子有限公司 | Overload protection circuit of boost DC/DC converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1954469A (en) * | 2004-05-18 | 2007-04-25 | 罗姆股份有限公司 | Excess current detecting circuit and power supply device provided with it |
| CN103595016A (en) * | 2013-11-22 | 2014-02-19 | 郑州光力科技股份有限公司 | Current-limiting protection circuit |
| WO2014039191A1 (en) * | 2012-09-06 | 2014-03-13 | Murata Manufacturing Co., Ltd. | Method and apparatus for continuous short-circuit protection |
| CN203839918U (en) * | 2014-04-21 | 2014-09-17 | 杭州电子科技大学 | Low-voltage direct current load overloading measurement and control circuit |
-
2014
- 2014-04-21 CN CN201410160375.4A patent/CN103956708B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1954469A (en) * | 2004-05-18 | 2007-04-25 | 罗姆股份有限公司 | Excess current detecting circuit and power supply device provided with it |
| WO2014039191A1 (en) * | 2012-09-06 | 2014-03-13 | Murata Manufacturing Co., Ltd. | Method and apparatus for continuous short-circuit protection |
| CN103595016A (en) * | 2013-11-22 | 2014-02-19 | 郑州光力科技股份有限公司 | Current-limiting protection circuit |
| CN203839918U (en) * | 2014-04-21 | 2014-09-17 | 杭州电子科技大学 | Low-voltage direct current load overloading measurement and control circuit |
Non-Patent Citations (1)
| Title |
|---|
| 杨利明: "简单实用的直流电源短路、过载保护电路", 《电子报》, 20 January 2008 (2008-01-20) * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953402A (en) * | 2017-03-31 | 2017-07-14 | 杭州电子科技大学 | The magnetic powder brake driving continued a journey based on super capacitor and under-voltage protecting circuit |
| CN106953402B (en) * | 2017-03-31 | 2023-03-31 | 杭州电子科技大学 | Magnetic powder brake driving and undervoltage protection circuit based on super capacitor endurance |
| CN107196269A (en) * | 2017-06-27 | 2017-09-22 | 巢湖学院 | A kind of DC protection circuit and its guard method |
| CN108255222A (en) * | 2018-02-08 | 2018-07-06 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of control system of multichannel current loading |
| CN108880213A (en) * | 2018-07-19 | 2018-11-23 | 杭州电子科技大学 | A kind of super capacitor discharge protection circuit based on MOSFET observing and controlling |
| CN108899951A (en) * | 2018-07-19 | 2018-11-27 | 杭州电子科技大学 | Super capacitor two close cycles buck charging control circuit based on pressure stabilizing output type |
| CN109066946A (en) * | 2018-07-19 | 2018-12-21 | 杭州电子科技大学 | A kind of super capacitor two close cycles decompression charging control circuit based on pressure limiting tracking mode |
| CN109672431A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | One kind having earth leakage protective 3 phase AC solid relay circuit |
| CN109672432A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | A kind of MOSFET direct-current solid-state relay circuit with short-circuit protection |
| CN109672433A (en) * | 2018-11-29 | 2019-04-23 | 杭州电子科技大学 | A kind of IGBT high voltage direct current solid-state relay circuit with short-circuit protection |
| CN109617011A (en) * | 2018-11-29 | 2019-04-12 | 杭州电子科技大学 | One kind having earth leakage protective high voltage direct current solid-state relay circuit |
| CN109617011B (en) * | 2018-11-29 | 2020-01-31 | 杭州电子科技大学 | high-voltage direct-current solid-state relay circuit with leakage protection |
| CN109672431B (en) * | 2018-11-29 | 2022-11-15 | 杭州电子科技大学 | Three-phase alternating current solid-state relay circuit with leakage protection |
| CN109672433B (en) * | 2018-11-29 | 2023-01-13 | 杭州电子科技大学 | IGBT high-voltage direct-current solid-state relay circuit with short-circuit protection |
| CN109672432B (en) * | 2018-11-29 | 2023-01-13 | 杭州电子科技大学 | MOSFET direct current solid state relay circuit with short-circuit protection |
| CN109449905A (en) * | 2018-12-25 | 2019-03-08 | 镇江中煤电子有限公司 | Mine power resource guard grating quick closedown circuit |
| CN109449905B (en) * | 2018-12-25 | 2024-04-05 | 镇江中煤电子有限公司 | Quick closing circuit for safety grid of mining power supply |
| CN113205942A (en) * | 2021-05-11 | 2021-08-03 | 南京科达新控仪表有限公司 | Permanent magnet synchronous motor follow current energy storage demagnetizing device and implementation method thereof |
| CN113205942B (en) * | 2021-05-11 | 2023-11-24 | 南京科达新控仪表有限公司 | Follow current energy storage demagnetizing device of permanent magnet synchronous motor and implementation method thereof |
| CN113644817A (en) * | 2021-08-13 | 2021-11-12 | 无锡市晶源微电子有限公司 | Overload protection circuit of boost DC/DC converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103956708B (en) | 2016-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103956708A (en) | Overload measurement and control circuit for low-voltage direct current load | |
| CN203166467U (en) | Overvoltage protection circuit | |
| CN208076672U (en) | A kind of relay adhesion detection circuit for electric vehicle | |
| CN106848998A (en) | A kind of power output protection circuit and device | |
| CN207354096U (en) | Band-type brake drive circuit and industrial robot | |
| CN203522143U (en) | Motor stalling detection circuit | |
| CN203839918U (en) | Low-voltage direct current load overloading measurement and control circuit | |
| CN203775096U (en) | DC motor driving and protecting circuit | |
| CN202330630U (en) | Detecting circuit for current and working condition of MOS (Metal Oxide Semiconductor) tube | |
| CN104411035B (en) | A kind of LED drive circuit powered without assists winding | |
| CN206533114U (en) | Power supply overvoltage protection circuit and power supply | |
| CN109672432B (en) | MOSFET direct current solid state relay circuit with short-circuit protection | |
| CN109617011A (en) | One kind having earth leakage protective high voltage direct current solid-state relay circuit | |
| CN204668926U (en) | A kind of IGBT drives and protective circuit | |
| CN202978236U (en) | Current limiting protection circuit of AC current of photovoltaic inverter | |
| CN103384056B (en) | Electric automobile electric drive controller 12V power supply protection circuit | |
| CN202998031U (en) | High-voltage power switch protection device | |
| CN207098589U (en) | A kind of LED power protection circuit against input over-voltage and LED power | |
| CN105790215B (en) | CT open-circuit protecting devices | |
| CN206489211U (en) | Saturation pressure down detection circuit for IGBT | |
| CN206698153U (en) | Drive device and its power source reverse connection protection circuit | |
| CN106211479B (en) | A kind of intelligent protection circuit for buffering transient high-current | |
| CN203707752U (en) | Under-voltage protection circuit for frequency converter | |
| CN205489460U (en) | CT open circuit protection device | |
| CN109672433A (en) | A kind of IGBT high voltage direct current solid-state relay circuit with short-circuit protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181220 Address after: 312000 Sanjiang Road, Goujiang Industrial Zone, Shaoxing City, Zhejiang Province Patentee after: Zhejiang Ruipu Then Mo AND Automatic Meter Co., Ltd. Address before: 310018 2 street, Xiasha Higher Education Park, Hangzhou, Zhejiang Patentee before: Hangzhou Electronic Science and Technology Univ |
|
| TR01 | Transfer of patent right |