CN206932209U

CN206932209U - Optomagnetic combination isolated form load switch

Info

Publication number: CN206932209U
Application number: CN201720713297.5U
Authority: CN
Inventors: 祝海强; 雷音
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-06-19
Filing date: 2017-06-19
Publication date: 2018-01-26
Anticipated expiration: 2027-06-19

Abstract

The utility model discloses a kind of optomagnetic combination isolated form load switch, including single channel or multichannel loading switch element, each control unit, including device for power switching, photoelectrical coupler, drive circuit and transformer；Described transformer connects power supply by transformer drive circuit, for being that impulse wave carries out isolation energy transmission by transformer by power supply transformation of electrical energy；Transformer also connects photoelectrical coupler and drive circuit by current rectifying and wave filtering circuit, and photoelectrical coupler and drive circuit are supplied into direct current for carrying out rectifying and wave-filtering to the impulse wave of isolation；Described photoelectrical coupler and drive circuit is connected with device for power switching, for receiving drive signal and by the way that drive signal isolation drive device for power switching is carried out into break-make.The load switch, conduction impedance is small, it is through-flow it is big, isolation voltage is high, switching speed is fast, can be applied to the fields such as field of battery management, power supply.

Description

Optomagnetic combination isolated form load switch

Technical field

Electronic circuit and component field are the utility model is related to, more particularly to a kind of optomagnetic combination isolated form load is opened Close.

Background technology

Industrial circle and field of battery management have the switching requirements of isolated form.As battery management system (BMS) custom is referred to as Battery nurse or battery house keeper, mainly aim at intelligent management and safeguard each battery unit, prevent battery from overcharging Electricity and overdischarge, extend the service life of battery, monitor the state of battery.In electric automobile, generally each battery unit by Some section lithium batteries are composed in series；Each battery unit matches somebody with somebody one or more BMS plates.Often section lithium battery need with disconnecting switch with Equalizing circuit and voltage detecting circuit connection.The structure often saves lithium battery and shared to equalizing circuit and lithium battery voltage detection circuit Same line, switched with isolated form switch cycles, typically at least each second, all batteries switched once.Sometimes also will be per batteries Equalizing circuit is respectively coupled to by different disconnecting switch and lithium battery voltage detects circuit.

Disconnecting switch in the industry generally uses optical relay (being also light MOS) or common relay at present.Optical relay with Common relay is compared：Switching speed is comparatively fast noiseless；But its is through-flow small, conduction impedance is high.Common relay and light relay Device is compared：Conduction impedance is low, and through-current capability is big；But mechanical contact slow motion, short life.

There are optically isolated MOSFET driving chips in other such as Infineon (INFINEON) company, can be come with external MOSFET Form disconnecting switch；But face the shortcomings that switching speed is partially slow.Exemplified by the PVI5033RPbF of Infineon, its output driving 200pF electric capacity maximum opening time wants 2.5 milliseconds, and the maximum turn-off time wants 0.5 millisecond.

In addition as micro- core (MICROCHIP) level conversion type MOSFET driving chips can be isolated with external MOSFET to form Switch；But face the shortcomings that turn-off speed is partially slow and isolation voltage is relatively low.

Utility model content

The purpose of this utility model is to provide a kind of optomagnetic combination isolated form load switch, the load switch, conduction impedance Small, through-flow big, isolation voltage height, switching speed are fast, can be applied to the fields such as field of battery management, power supply.

To reach above-mentioned purpose, the technology of preparing scheme that the utility model uses for：

A kind of optomagnetic combination isolated form load switch, including single channel or multichannel loading switch element, each load switch list Member includes device for power switching, drive circuit, current rectifying and wave filtering circuit and photoelectrical coupler；Transformer inputs are driven by transformer Dynamic circuit connection power supply, isolation energy transmission is carried out by transformer for impulse wave for converting electric energy into；Transformer is defeated Go out end and photoelectrical coupler and drive circuit connected by current rectifying and wave filtering circuit, for the impulse wave progress rectifying and wave-filtering to isolation into Direct current supplies photoelectrical coupler and drive circuit；Described photoelectrical coupler is connected by drive circuit and device for power switching Connect, for receiving drive signal and by the way that drive signal isolation drive device for power switching is carried out into break-make.

Described device for power switching is combined by single power device or the connection of multiple power devices, and power device is MOSFET, diode or IGBT.

The totem-pote circuit that described drive circuit is formed using triode or metal-oxide-semiconductor, the input termination of totem-pote circuit The output signal of photoelectrical coupler, the resistance of output end connect the driving anode of device for power switching.

First secondary winding of described transformer is connected respectively each load switch unit rectification to N secondary windings Filter circuit；First winding connects the power switch of transformer drive circuit.

The current rectifying and wave filtering circuit of multichannel loading switch element is connected power supply with transformer.

Relative to prior art, the utility model has following benefit：

The utility model combines to form optomagnetic combination by device for power switching, photoelectrical coupler, transformer, drive circuit Isolated form load switch, it is possible to achieve single channel or variable connector, photoelectrical coupler receive drive signal and by by drive signals Isolation control drive circuit driving power switching device carries out break-make, the load switch, and conduction impedance is small, through-flow big, isolation electricity Pressure is high, switching speed is fast, can be applied to the fields such as field of battery management, power supply.Solve problems of the prior art:Light Through-flow small, the conduction impedance height of relay (being also light MOS)；The mechanical contact slow motion of common relay, short life；It is optically isolated MOSFET driving chip switching speeds are partially slow；Level conversion type MOSFET driving chip isolation voltages are low.

Further, it is direct come drive circuit in omitting, photoelectrical coupler to have the photoelectrical coupler of output driving ability for selection Driving power switching device carries out break-make；Or selection photoelectrical coupler is led to by drive circuit driving power switching device It is disconnected.

Further, drive circuit can use the totem pole configuration that triode or metal-oxide-semiconductor form, and the structure control is accurate, It is quick on the draw.Drive circuit can carry excessively stream, overvoltage, the defencive function such as overheat.

Brief description of the drawings

Fig. 1 is the structured flowchart of optomagnetic combination isolated form load switch；

Fig. 2 is power switch circuit exemplary plot；

Fig. 3 is power switch circuit exemplary plot；

Fig. 4 is transformer exemplary plot；

In figure, 1. device for power switching, 2. drive circuits, 3. current rectifying and wave filtering circuits, 4. photoelectrical couplers, 5. transformers, 6. transformer drive circuit；N-1. n-th device for power switching, N-2. n-th drive circuits, N-3. n-ths rectifying and wave-filtering electricity Road, N-4. n-th photoelectrical couplers；11.N-MOSFET, 12.N-MOSFET, 13. drive anode, 14. driving negative terminals； 21.NPN triodes, 22.PNP triodes, 23. resistance.

Embodiment

Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail：

A kind of structured flowchart such as Fig. 1 of optomagnetic combination isolated form load switch of the utility model.Can be designed to single channel or Multichannel loading switch element, each load switch cell power switching device (1~N-1), be circuit on-off switch, due to drive Dynamic circuit (2~N-2) can obtain sufficiently large energy by transformer-supplied, thus the selection to device for power switching not by The limitation of driving force；And driving energy of the optical relay (being also light MOS) due to driving its MOSFET by photoelectric effect transmission, Its driving energy limits internal MOSFET selection, therefore its conduction impedance is larger, less than normal by electric current.And the utility model Power switch conduction impedance can be selected small, pass through the big device of electric current.

Because drive circuit in the scheme of the optomagnetic combination isolated form load switch of utility model can by transformer-supplied To obtain sufficiently large energy, then go by photoelectrical coupler to trigger drive circuit, so the more existing smooth relay of switching speed The devices such as device (being also light MOS) are fast.

Because driving energy uses transformer isolation in the scheme of the optomagnetic combination isolated form load switch of utility model, driving Signal can obtain more than 1500V DC-isolation voltage by photoelectric coupler isolation.

The optomagnetic combination isolated form load switch principle of the utility model is：

In Fig. 1, power supply transformation of electrical energy is that impulse wave carries out isolating energy biography by transformer 5 by transformer drive circuit 6 Defeated, current rectifying and wave filtering circuit (3~N-3) carries out rectifying and wave-filtering to the impulse wave of isolation and supplies drive circuit (2~N- into direct current 2) figure drive circuit (2~N-2), is made there are enough energy driving power switching devices (1~N-1)；Photoelectrical coupler (4~N- 4) drive circuit (2~N-2) driving power switching device (1~N-1) is controlled to carry out break-make respectively drive signal isolation.

Device for power switching (1~N-1) can realize that two N-MOSFET (11,12) are connected by the way of Fig. 2, two N-MOSFET (11,12) drain electrode is connected or the source electrode of two N-MOSFET (11,12) is connected.Or opened using other power Close device such as controllable silicon, diode, IGBT etc.；Connected mode can be single device or more combination of devices (series and parallel) connection.

Drive circuit (2~N-2) can use the totem pole configuration that triode or metal-oxide-semiconductor form, such as Fig. 3, input " entering " connects the output signal of photoelectrical coupler 4；When " entering " is high level, NPN triode 21 is turned on, and PNP triode 22 is ended, electricity The "+" of resistance 23 is high level；When " entering " is low level, NPN triode 21 is ended, and PNP triode 22 turns on, the "+" of resistance 23 For low level.Special driving chip or its wafer can also be used, such as TC442X, MIC442X etc., can also be had in selection defeated Go out the photoelectrical coupler of driving force to omit drive circuit in Fig. 1 (2~N-2), such as ACNU-3410, ACPL-352J etc..Drive "+" and "-" are distinguished in map interlinking 2 " 3 " and " 4 " in dynamic circuit (2~N-2).

The realization of transformer 5 such as Fig. 4, the first winding N2-1 are connected respectively current rectifying and wave filtering circuit to the second winding N2-N 1 arrives current rectifying and wave filtering circuit N；The power switch of transformer drive circuit 6 in winding N1 connection figures 1；If transformer drive circuit Worked using winding feedback mode, winding Np connection feedback circuits；If transformer drive circuit uses primary side feedback mode work Make or worked without winding feedback mode, then do not need winding Np.It can be increased according to feedback system and rectifying and wave-filtering mode and added deduct Few Transformer Winding.

The drive circuit of transformer 6 can use discrete device to realize, can also use using special driving chip or its crystalline substance Circle, such as MIC2296, LT3748 etc..

More than, preferred embodiment only of the present utility model, it is not limited only to practical range of the present utility model, Fan Yiben The equivalence changes and modification that the content of utility model patent scope is done, it all should be technology category of the present utility model.

Claims

1. a kind of optomagnetic combination isolated form load switch, it is characterised in that each negative including single channel or multichannel loading switch element Load switch unit includes device for power switching (1), drive circuit (2), current rectifying and wave filtering circuit (3) and photoelectrical coupler (4)；Transformation Device (5) input connects power supply by transformer drive circuit (6), passes through transformer for converting electric energy into for impulse wave (5) carry out isolating energy transmission；Transformer (5) output end connects photoelectrical coupler (4) and driving by current rectifying and wave filtering circuit (3) Circuit (2), photoelectrical coupler (4) and drive circuit (2) are supplied into direct current for carrying out rectifying and wave-filtering to the impulse wave of isolation； Described photoelectrical coupler (4) is connected by drive circuit (2) with device for power switching (1), for receiving drive signal and leading to Cross and drive signal isolation drive device for power switching (1) is subjected to break-make.

2. optomagnetic combination isolated form load switch according to claim 1, it is characterised in that described device for power switching (1) combined by single power device or the connection of multiple power devices, power device MOSFET, diode or IGBT.

3. optomagnetic combination isolated form load switch according to claim 1, it is characterised in that described drive circuit (2) The totem-pote circuit formed using triode or metal-oxide-semiconductor, the output letter of the input termination photoelectrical coupler (4) of totem-pote circuit Number, the resistance (23) of output end connects the driving anode of device for power switching (1).

4. optomagnetic combination isolated form load switch according to claim 1, it is characterised in that described transformer (5) First secondary winding (N2-1) is connected respectively each load switch unit current rectifying and wave filtering circuit to N secondary windings (N2-N) (3)；The power switch of first winding (N1) connection transformer drive circuit (6).

5. optomagnetic combination isolated form load switch according to claim 1, it is characterised in that multichannel loading switch element Current rectifying and wave filtering circuit (3) is connected power supply with transformer (5).