CN104734480A - Secondary rectification absorption circuit in direct current transformer for electric automobile - Google Patents
Secondary rectification absorption circuit in direct current transformer for electric automobile Download PDFInfo
- Publication number
- CN104734480A CN104734480A CN201510087737.6A CN201510087737A CN104734480A CN 104734480 A CN104734480 A CN 104734480A CN 201510087737 A CN201510087737 A CN 201510087737A CN 104734480 A CN104734480 A CN 104734480A
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- China
- Prior art keywords
- rectified power
- power switching
- switching tube
- grid
- branch road
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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)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a secondary rectification absorption circuit in a direct current transformer for an electric automobile. The secondary rectification absorption circuit in the direct current transformer for the electric automobile comprises a rectified power switch tube of a secondary winding of a main transformer connected in the direct current transformer, a grid of the rectified power switch tube is connected with a control signal output end of a PWM control chip, a discharge R1 is connected between the grid of the rectified power switch tube and a source electrode, an absorption branch is formed by the connection of a absorbing C1 and a absorbing R3 in series, one end of the absorption branch is connected with a drain of the rectified power switch tube, the other end of the absorption branch is connected with a source electrode after connecting with a switch module in series, and the switch module and the rectified power switch tube alternately turn on and off. The secondary rectification absorption circuit in the direct current transformer for the electric automobile has the advantage that the loss and heating value of the whole direct current transformer can be greatly reduced.
Description
Technical field
The present invention relates to the DC converter in electric automobile, refer more particularly to the secondary commutation absorbing circuit in DC converter.
Background technology
Electric automobile take on-vehicle battery as power supply, the voltage of general on-vehicle battery is up to hundreds of volt, so be all equipped with DC converter in electric automobile, in order to hundreds of volt voltages of on-vehicle battery are down to 12V or 24V, for the power consumption equipment in electric automobile is as power supplies such as CD, front and back car light, rain brush.In DC converter main transformer a pair secondary winding on be connected to the identical Half bridge rectifier circuit of the structure that is made up of a rectification MOS power switch pipe, two Half bridge rectifier circuit form a full bridge rectifier, usually all pwm chip is used---the UCC28950 chip as TIX (Texas Instruments) controls and drives the switching and rectifying work of a pair rectification MOS power switch pipe, that is: the grid of two rectification MOS power switch pipes is connected respectively with two control signal outputs of pwm chip.Due to back electromotive force kurtosis can be produced at the shutdown moment of rectification MOS power switch pipe, therefore usually all can use resistance capaciting absorpting circuit to absorb and suppress this spike back electromotive force, that is: in parallel by Absorption Capacitance and absorption resistance absorbing circuit in series between the source electrode and drain electrode of rectification MOS power switch pipe.The shortcoming of above-mentioned traditional resistance capaciting absorpting circuit is: although can absorb when rectification MOS power switch pipe turns off and suppress spike back electromotive force, but at the normally duration of work of rectification MOS power switch pipe, this resistance capaciting absorpting circuit still can consume electric energy, will increase loss and the caloric value of whole DC converter.
Summary of the invention
The object of the invention is: a kind of secondary commutation absorbing circuit that can effectively reduce in the loss of whole DC converter and the DC converter used for electric vehicle of caloric value is provided.
For achieving the above object, present invention employs following technical scheme.
Secondary commutation absorbing circuit in DC converter used for electric vehicle, comprise: the rectified power switching tube being connected to the secondary winding of main transformer in DC converter, the grid of rectified power switching tube is connected with the control signal output of pwm chip, discharge resistance R1 is connected with between the grid and source electrode of rectified power switching tube, be characterized in: form after Absorption Capacitance C1 and absorption resistance R3 connects and absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube, absorb the other end of branch road to connect after a switch module and be connected with the source electrode of rectified power switching tube, described switch module and described rectified power switching tube alternately turn-on and turn-off, like this, when rectified power switching tube is in conducting rectification state, switch module is in off state and makes absorption branch road be in open-circuit condition, when rectified power switching tube is in off state, switch module is in conducting state and absorption branch road is absorbed and resists spike back electromotive force.
Further, secondary commutation absorbing circuit in aforesaid DC converter used for electric vehicle, wherein: described rectified power switching tube is NMOS tube, 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 to be connected between the grid of PMOS and the grid of NMOS tube, be attempted by again between the grid of PMOS and source electrode after discharge resistance R2 and clamp diode D1 parallel connection.
The invention has the beneficial effects as follows: due to switch module and described rectified power switching tube alternately turn-on and turn-off, like this, only worked when rectified power switching tube turns off by the absorption branch road that Absorption Capacitance C1 and absorption resistance R3 is in series and do not work during rectified power switching tube normally, that is: absorb branch road when the conducting of rectified power switching tube and do not produce consumption, thus greatly reduce loss and the caloric value of whole DC converter.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.The Half bridge rectifier circuit structure be made up of a NMOS rectified power switching tube that a pair secondary winding due to main transformer T in DC converter connects respectively is identical, therefore only schematically show the lower half-bridge rectisorption circuit that one of them is made up of NMOS rectified power switching tube in Fig. 1, repeat no more half-bridge rectisorption circuit on another.
As shown in Figure 1, secondary commutation absorbing circuit in described DC converter used for electric vehicle, comprise: the rectified power switching tube Q1 being connected to a secondary winding of main transformer T in DC converter, the grid of rectified power switching tube Q1 is connected with the control signal output of pwm chip, the UCC28950 chip of TIX (Texas Instruments) can be adopted in actual applications, in practical application, also can adopt the chip that other function is identical or close; Discharge resistance R1 is connected with between the grid and source electrode of rectified power switching tube Q1, form after Absorption Capacitance C1 and absorption resistance R3 connects and absorb branch road, absorb one end of branch road to be connected with the drain electrode of rectified power switching tube Q1, the other end of absorption branch road is connected after a switch module and is connected with the source electrode of rectified power switching tube Q1; Described switch module and described rectified power switching tube Q1 alternately turn-on and turn-off, like this, when rectified power switching tube is in conducting rectification state, switch module is in off state and makes absorption branch road be in open-circuit condition; When rectified power switching tube is in off state, switch module is in conducting state and absorption branch road is absorbed and resists spike back electromotive force.In the present embodiment, described rectified power switching tube Q1 is NMOS tube, 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 is connected with the source electrode of NMOS tube Q1, electric capacity C2 is driven to be connected between the grid of PMOS Q2 and the grid of NMOS tube Q1, be attempted by between the grid of PMOS Q2 and source electrode after discharge resistance R2 and clamp diode D1 parallel connection, namely the positive pole of clamp diode D1 is connected with the grid of PMOS Q2 again.
The operation principle of absorbing circuit of the present invention is as follows: when the control signal output of pwm chip exports high level drive singal, NMOS tube Q1 conducting, the grid of PMOS Q2 is by the conducting voltage of clamp diode D1 clamper at diode, therefore PMOS Q2 turns off and not conducting, now high level drive singal just charges to driving electric capacity C2, such NMOS tube Q1 is just in conducting rectification state, and be now in open-circuit condition by the absorption branch road that Absorption Capacitance C1 and absorption resistance R3 is in series, absorb branch road and do not work lossless.When the control signal output output low level drive singal of pwm chip, NMOS tube Q1 turns off, electric capacity C2 is driven to provide negative driving voltage for PMOS Q2 grid, clamp diode D1 oppositely ends, such PMOS Q2 is just in conducting state, is just started working like this by the absorption branch road that Absorption Capacitance C1 and absorption resistance R3 is in series; In the process, drive electric capacity C2 to be discharged by discharge resistance R2, when the grid turning-on voltage driving the voltage of electric capacity C2 higher than PMOS Q2, PMOS Q2 turns off, and absorbs branch road and is in open-circuit condition again.
In real work, can adjust driving the parameter of electric capacity C2 and discharge resistance R2, make to absorb branch road and only producing the moment work of spike back electromotive force, thus effectively greatly can reduce the loss absorbing branch road, finally can greatly 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, comprise: the rectified power switching tube being connected to the secondary winding of main transformer in DC converter, the grid of rectified power switching tube is connected with the control signal output of pwm chip, discharge resistance R1 is connected with between the grid and source electrode of rectified power switching tube, it is characterized in that: form after Absorption Capacitance C1 and absorption resistance R3 connects and absorb branch road, the one end absorbing branch road is connected with the drain electrode of rectified power switching tube, absorb the other end of branch road to connect after a switch module and be connected with the source electrode of rectified power switching tube, described switch module and described rectified power switching tube alternately turn-on and turn-off, like this, when rectified power switching tube is in conducting rectification state, switch module is in off state and makes absorption branch road be in open-circuit condition, when rectified power switching tube is in off state, switch module is in conducting state and absorption branch road is absorbed and resists spike back electromotive force.
2. the secondary commutation absorbing circuit in DC converter used for electric vehicle according to claim 1, it is characterized in that: described rectified power switching tube is NMOS tube, 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 to be connected between the grid of PMOS and the grid of NMOS tube, be attempted by again between the grid of PMOS and source electrode after discharge resistance R2 and clamp diode D1 parallel connection.
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 true CN104734480A (en) | 2015-06-24 |
| CN104734480B CN104734480B (en) | 2017-03-01 |
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| 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 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256550A (en) * | 1999-12-30 | 2000-06-14 | 深圳市华为电气股份有限公司 | 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 |
-
2015
- 2015-02-26 CN CN201510087737.6A patent/CN104734480B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256550A (en) * | 1999-12-30 | 2000-06-14 | 深圳市华为电气股份有限公司 | 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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| CN104734480B (en) | 2017-03-01 |
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