CN104734480B - Secondary commutation absorbing circuit in DC converter used for electric vehicle - Google Patents
Secondary commutation absorbing circuit in DC converter used for electric vehicle Download PDFInfo
- Publication number
- CN104734480B CN104734480B CN201510087737.6A CN201510087737A CN104734480B CN 104734480 B CN104734480 B CN 104734480B CN 201510087737 A CN201510087737 A CN 201510087737A CN 104734480 B CN104734480 B CN 104734480B
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- China
- Prior art keywords
- switching tube
- power switching
- rectified power
- branch road
- grid
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the secondary commutation absorbing circuit in a kind of DC converter used for electric vehicle, including：It is connected to the rectified power switching tube of the secondary windings of main transformer in DC converter, the grid of rectified power switching tube is connected with the control signal outfan of pwm chip, it is connected with discharge resistance R1 between the grid and source electrode of rectified power switching tube, constitute after Absorption Capacitance C1 and absorption resistance R3 series connection and absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube, is connected with the source electrode of rectified power switching tube after the other end one switch module of series connection absorbing branch road；Described switch module and described rectified power switching tube alternately turn-on and turn-off.It is an advantage of the invention that：Loss and the caloric value of whole DC converter can be greatly reduced.
Description
Technical field
The present invention relates to the secondary commutation in the DC converter in electric automobile, more particularly, to DC converter absorbs
Circuit.
Background technology
With on-vehicle battery as power supply, the voltage of general on-vehicle battery is up to hundreds of volts to electric automobile, so electronic vapour
It is equipped with DC converter in car, in order to hundreds of volt voltages of on-vehicle battery are down to 12V or 24V, be in electric automobile
Electrical equipment such as CD, the in front and back power supply such as car light, rain brush.Connect respectively on a pair of secondary windings of main transformer in DC converter
There is the structure identical Half bridge rectifier circuit being made up of a rectification MOS power switch pipe, two Half bridge rectifier circuit constitute one
Individual full bridge rectifier, is generally used pwm chip such as TIX (Texas Instruments)
UCC28950 chip controlling and to drive the switching and rectifying of a pair of rectification MOS power switch pipe to work, that is,：Two rectification MOS
The grid of power switch pipe is respectively connected with the two of pwm chip control signal outfans.Due in rectification MOS power
The shutdown moment of switching tube can produce counter electromotive force kurtosis, therefore generally all can be absorbed using resistance capaciting absorpting circuit and suppress
This spike counter electromotive force, that is,：Between the source electrode of rectification MOS power switch pipe and drain electrode, parallel connection is by Absorption Capacitance and absorption resistance
Absorbing circuit in series.Above-mentioned tradition resistance capaciting absorpting circuit shortcoming be：Although when rectification MOS power switch pipe turns off
Can absorb and suppression spike counter electromotive force, but during the normally of rectification MOS power switch pipe works, this resistance-capacitance absorption
Circuit still can consume electric energy, will increase loss and the caloric value of whole DC converter.
Content of the invention
The purpose of the present invention is：The electronic vapour of a kind of loss that can effectively reduce whole DC converter and caloric value is provided
Secondary commutation absorbing circuit in Vehicular direct-current converter.
For achieving the above object, present invention employs technical scheme below.
Secondary commutation absorbing circuit in DC converter used for electric vehicle, including：It is connected to main transformer in DC converter
The rectified power switching tube of the secondary windings of depressor, the grid of rectified power switching tube is defeated with the control signal of pwm chip
Go out end to be connected, be connected with discharge resistance R1 between the grid and source electrode of rectified power switching tube, be characterized in：Absorption Capacitance
Constitute after C1 and absorption resistance R3 series connection and absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube,
It is connected with the source electrode of rectified power switching tube after the other end one switch module of series connection absorbing branch road；Described switch module with
Described rectified power switching tube alternately turn-on and turn-off, so, when rectified power switching tube is on rectification state, open
Close module to be off state and make absorption branch road be in open-circuit condition；When rectified power switching tube is off state, open
Close module in the conduction state and so that absorption branch road is absorbed and resist spike counter electromotive force.
Further, the secondary commutation absorbing circuit in aforesaid DC converter used for electric vehicle, wherein：Described rectification
Power switch pipe is NMOS tube, and the structure of described switch module is：The drain electrode of PMOS is connected with the other end absorbing branch road,
The source electrode of PMOS is connected with the source electrode of NMOS tube, drive electric capacity C2 be connected to the grid of PMOS and NMOS tube grid it
Between, it is attempted by between the grid of PMOS and source electrode after discharge resistance R2 and clamp diode D1 parallel connection again.
The invention has the beneficial effects as follows：Due to switch module and described rectified power switching tube alternately turn-on and turn-off,
So, only worked when rectified power switching tube turns off by Absorption Capacitance C1 and absorption resistance R3 absorption branch road in series,
And do not work during rectified power switching tube normally, that is,：Absorb branch road not produce when rectified power switching tube turns on
Consume, thus greatly reducing loss and the caloric value of whole DC converter.
Brief description
Fig. 1 is the principle schematic diagram. of the present invention.
Specific embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.Due to main transformer pressure in DC converter
The Half bridge rectifier circuit structure phase being made up of a NMOS rectified power switching tube connecting respectively on a pair of secondary windings of device T
Same, only symbolically indicate one of lower Half bridge rectifier being made up of NMOS rectified power switching tube in therefore Fig. 1 and inhale
Receive circuit, repeat no more half-bridge rectisorption circuit on another.
As shown in figure 1, the secondary commutation absorbing circuit in described DC converter used for electric vehicle, including：It is connected to
The rectified power switching tube Q1 of secondary windings of main transformer T, the grid of rectified power switching tube Q1 in DC converter
It is connected with the control signal outfan of pwm chip, TIX (Texas can be adopted in actual applications
Instruments UCC28950 chip), may also be employed the same or like chip of other functions in practical application；In rectification
Constitute after being connected with discharge resistance R1, Absorption Capacitance C1 and absorption resistance R3 series connection between the grid of power switch pipe Q1 and source electrode
Absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube Q1, absorb the other end series connection one of branch road
It is connected with the source electrode of rectified power switching tube Q1 after individual switch module；Described switch module and described rectified power switching tube Q1
Alternately turn-on and turn-off, so, when rectified power switching tube is on rectification state, switch module is off state
And make absorption branch road be in open-circuit condition；When rectified power switching tube is off state, switch module is in the conduction state
And so that absorption branch road is absorbed and resist spike counter electromotive force.In the present embodiment, described rectified power switching tube Q1 is NMOS
Manage, the structure of described switch module is：The drain electrode of PMOS Q2 is connected with the other end absorbing branch road, the source electrode of PMOS Q2
It is connected with the source electrode of NMOS tube Q1, drive electric capacity C2 to be connected between the grid of PMOS Q2 and the grid of NMOS tube Q1, put
It is attempted by between the grid of PMOS Q2 and source electrode after resistance R2 and clamp diode D1 parallel connection, i.e. clamp diode D1 again
Positive pole is connected with the grid of PMOS Q2.
The operation principle of absorbing circuit of the present invention is as follows：Control signal outfan output when pwm chip
During high level drive signal, NMOS tube Q1 turns on, the grid of PMOS Q2 by clamp diode D1 clamper diode conducting
Voltage, therefore PMOS Q2 turn off and are not turned on, and now high level drive signal is just charged to driving electric capacity C2, so
NMOS tube Q1 is at turning on rectification state, and now by the absorption branch road that Absorption Capacitance C1 and absorption resistance R3 is in series
In open-circuit condition, absorption branch road does not work lossless.When the control signal outfan output low level of pwm chip drives letter
Number when, NMOS tube Q1 turns off, and drives electric capacity C2 to provide negative driving voltage for PMOS Q2 grid, clamp diode D1 reversely cuts
Only, such PMOS Q2 is at conducting state, so by the absorption branch road that Absorption Capacitance C1 and absorption resistance R3 is in series
Begin to work；In the process, electric capacity C2 is driven to be discharged by discharge resistance R2, when the voltage driving electric capacity C2 is higher than
During the grid turning-on voltage of PMOS Q2, PMOS Q2 turns off, and absorbs branch road and is in open-circuit condition again.
In real work, the parameter driving electric capacity C2 and discharge resistance R2 can be adjusted so that absorbing branch road
Only producing the moment work of spike counter electromotive force, so as to effectively substantially reduce the loss absorbing branch road, finally can be significantly
Reduce loss and the caloric value of whole DC converter.
Claims (2)
1. the secondary commutation absorbing circuit in DC converter used for electric vehicle, including：It is connected to main transformer pressure in DC converter
The rectified power switching tube of the secondary windings of device, the grid of rectified power switching tube is exported with the control signal of pwm chip
End is connected, be connected with discharge resistance R1 between the grid and source electrode of rectified power switching tube it is characterised in that：Absorption Capacitance
Constitute after C1 and absorption resistance R3 series connection and absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube,
It is connected with the source electrode of rectified power switching tube after the other end one switch module of series connection absorbing branch road；Described switch module with
Described rectified power switching tube alternately turn-on and turn-off, so, when rectified power switching tube is on rectification state, open
Close module to be off state and make absorption branch road be in open-circuit condition；When rectified power switching tube is off state, open
Close module in the conduction state and so that absorption branch road is absorbed and resist spike counter electromotive force.
2. the secondary commutation absorbing circuit in DC converter used for electric vehicle according to claim 1 it is characterised in that：
Described rectified power switching tube is NMOS tube, and the structure of described switch module is：The drain electrode of PMOS is another with absorption branch road
End is connected, and the source electrode of PMOS is connected with the source electrode of NMOS tube, drives electric capacity C2 to be connected to grid and the NMOS of PMOS
Between the grid of pipe, it is attempted by between the grid of PMOS and source electrode after discharge resistance R2 and clamp diode D1 parallel connection again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510087737.6A CN104734480B (en) | 2015-02-26 | 2015-02-26 | Secondary commutation absorbing circuit in DC converter used for electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510087737.6A CN104734480B (en) | 2015-02-26 | 2015-02-26 | Secondary commutation absorbing circuit in DC converter used for electric vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104734480A CN104734480A (en) | 2015-06-24 |
| CN104734480B true CN104734480B (en) | 2017-03-01 |
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ID=53458033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510087737.6A Active CN104734480B (en) | 2015-02-26 | 2015-02-26 | Secondary commutation absorbing circuit in DC converter used for electric vehicle |
Country Status (1)
| Country | Link |
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| CN (1) | CN104734480B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108011C (en) * | 1999-12-30 | 2003-05-07 | 艾默生网络能源有限公司 | Self-driving circuit of dc/dc converter |
| CN201222702Y (en) * | 2008-06-04 | 2009-04-15 | 瑞谷科技(深圳)有限公司 | Synchronous rectifying drive circuit for switch converter |
| CN203691240U (en) * | 2013-12-05 | 2014-07-02 | 联合汽车电子有限公司 | Active clamping absorbing circuit |
| CN204578353U (en) * | 2015-02-26 | 2015-08-19 | 张家港市华为电子有限公司 | Secondary commutation absorbing circuit in DC converter used for electric vehicle |
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2015
- 2015-02-26 CN CN201510087737.6A patent/CN104734480B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104734480A (en) | 2015-06-24 |
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