CN2494570Y - Power switch overcurrent detector for power inverter - Google Patents
Power switch overcurrent detector for power inverter Download PDFInfo
- Publication number
- CN2494570Y CN2494570Y CN 01246336 CN01246336U CN2494570Y CN 2494570 Y CN2494570 Y CN 2494570Y CN 01246336 CN01246336 CN 01246336 CN 01246336 U CN01246336 U CN 01246336U CN 2494570 Y CN2494570 Y CN 2494570Y
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- power switch
- power
- over
- fast diode
- fast
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Abstract
The utility model discloses a power switch over-current detector for power inverter, in particular to a power switch over-current detector for AC-AC power inverter adopting PWM technology. The detector consists of an adjusting resistance R1, fast diodes D1, D2, D3, D4 and D5 as well as a filter capacitance C1. When in use, the two end voltages of a drain electrode and a source electrode of the power switch get a DC voltage through rectified by the fast diodes D1, D2, D3 and D4, filtered by the filter capacitance C1 and then acted to an over-current detecting terminal of an isolation driver by the D5 and R1 for the isolation driver to judge whether the power switch is over-current or nor according to pulse triggering situation and act protection processing. The utility model has the advantages of simpleness and reliability as well as fast currency, etc.
Description
Technical field: the utility model relates to a kind of power converter power switch over-current detector, especially adopts the over-current detector of power switch in the friendship alternating current force transducer of PWM technology.
Background technology: existing power electronics converting means is made up of power converter, driver, microcontroller and power switch over-current detector.Power device in the power converter need be taked accurately by the power switch over-current detector, quick, overcurrent protection reliably, otherwise power device will be burnt.The alternating electromotive force converter is divided into to be handed over the orthogonal power converter and hands over two kinds of basic transformation patterns of alternating current force transducer, and what hand over the copped wave of orthogonal converter is direct voltage, and the copped wave of friendship alternating current force transducer is AC power phase voltage or line voltage.Therefore, both power switch over-current detectors should be not identical, hands over orthogonal converter power switch over-current detector to be in series and to constitute by being connected adjustment resistance between driver and the power switch and fast diode, and be applied; Hand over the overcurrent protection detector of power switch in the alternating current force transducer; once the someone imagined the overcurrent protection detector that directly utilizes power switch in the above-mentioned friendship orthogonal converter as the overcurrent protection detector of handing over power switch in the alternating current force transducer; but this exists on principle original driver for isolating formation harm is made it to lose the problem of over-current detection function, so yet there are no relevant application report.
Summary of the invention: the utility model comprises adjusts resistance R 1, fast diode D5, an end of adjusting resistance R 1 is connected with the over-current detection port of the driver for isolating that comprises the overcurrent arbitration functions, the other end is connected with the anode of fast diode D5, it is characterized in that: also comprise fast diode D1, D2, D3, D4 and filter capacitor C1, the end of the negative electrode of fast diode D5 and filter capacitor C1 and fast diode D1, the negative electrode of D2 connects, the other end of filter capacitor C1 and fast diode D3, the anode of D4 connects, the anode of fast diode D1, the negative electrode of D4 is connected with the drain electrode of power switch in the power converter, the anode of fast diode D2, the negative electrode of D3 is connected with the source electrode of power switch in the power converter, and the trigger impulse terminal of driver for isolating links to each other with the gate pole of power switch in the power converter.The utility model is owing to carry out rectification by fast diode D1, D2, D3, D4 with the free voltage (containing alternating voltage and direct voltage) between power switch source electrode in the power converter and the drain electrode, make in the formation of filter capacitor C1 just direct voltage of (+) down negative (-), this direct voltage is by adjusting the over-current detection port that resistance R 1 and diode D5 are applied to driver for isolating, then reached power device over-current detection function, thereby have versatility, applicable to the over-current detection of power switch in the various power converters.In addition, the utility model also and have an advantage simple in structure, fast and reliable.
Description of drawings: followingly provide embodiment of the present utility model and accompanying drawing, and be described further:
Fig. 1 is an embodiment accompanying drawing of the present utility model.
Embodiment: shown in Figure 1, the Technics of Power Electronic Conversion device is by the driver for isolating 1 that has the overcurrent arbitration functions, the utility model 2, microcontroller 3 and hand over alternating current force transducer 4 to form.The utility model 2 constitutes by adjusting resistance R 1, fast diode D1, D2, D3, D4, D5 and filter capacitor C1.An end of adjusting resistance R 1 is connected with the over-current detection port of the driver for isolating 1 that comprises the overcurrent arbitration functions, and the other end of adjusting resistance R 1 is connected with the anode of fast diode D5.The negative electrode of fast diode D5 is connected with the end of filter capacitor C1 and the negative electrode of fast diode D1, D2, the other end of filter capacitor C1 is connected with the anode of fast diode D3, D4, the drain D of power switch T1 is connected in the anode of fast diode D1, the negative electrode of D4 and the power converter 4, the source S of power switch T1 is connected in the anode of fast diode D2, the negative electrode of D3 and the power converter 4, and the trigger impulse terminal of driver for isolating 1 links to each other with the gate pole G of power switch T1 in the power converter 4.Carry out informational linkage by two circuits between microcontroller 3 and the driver 1, microcontroller 3 is same ground connection GND2 with the source class of driver for isolating 1, and the source S of power switch T1 is same ground connection GND1 in the secondary and power converter 4 of driver for isolating 1.In the use when opening power switch T1, microcontroller 3 sends drive signal to driver for isolating 1, obtain the drive signal of certain voltage grade after driver for isolating 1 is made this drive signal electrical isolation and promoted, the gate pole G that this drive signal is delivered to power switch T1 opens power switch T1.When power converter need be closed power switch T1, microcontroller 3 sends shutdown signal to driver for isolating 1, send the shutdown signal of certain voltage grade after driver for isolating 1 is made this drive signal electrical isolation again and promoted, the gate pole G that this shutdown signal is delivered to power switch T1 closes power switch T1.In when, in the power switch T1 turn on process overcurrent taking place when, the direct voltage at filter capacitor C1 two ends will be far longer than the direct voltage of (during normally) when overcurrent does not take place, driver for isolating 1 can detect this abnormal voltage immediately, and judge power switch T1 overcurrent takes place, interrupt pin or incident are caught pin and are sent fault-signal outside microcontroller 3 immediately, microcontroller 3 sends shutdown signal from its PWM delivery outlet to driver for isolating 1 immediately, can close power switch T1, prevent that fault from drawing out.
The utility model is owing to increased fast diode D1, D2, D3, D4 and filter capacitor C1 original the friendship in the orthogonal power converter power switch over-current detector, make source S and the free voltage between the drain D (containing alternating voltage, direct voltage) of power switch T1 carry out rectification, thereby have versatility, applicable to the over-current detection of power switch in the various power converters.
Above-mentioned fast diode D1, D2, D3, D4, D5 are fast quick-recovery type, and reverse blocking voltage is greater than 500VAC; The value of filter capacitor C1 is 10-20PF.
Claims (2)
1, a kind of power converter power switch over-current detector, comprise and adjust resistance R 1, fast diode D5, an end of adjusting resistance R 1 is connected with the over-current detection port of the driver for isolating 1 that comprises the overcurrent arbitration functions, the other end is connected with the anode of fast diode D5, it is characterized in that: also comprise fast diode D1, D2, D3, D4 and filter capacitor C1, the end of the negative electrode of fast diode D5 and filter capacitor C1 and fast diode D1, the negative electrode of D2 connects, the other end of filter capacitor C1 and fast diode D3, the anode of D4 connects, the anode of fast diode D1, the negative electrode of D4 is connected with the drain D of power switch T1 in the power converter 4, the anode of fast diode D2, the negative electrode of D3 is connected with the source S of power switch T1 in the power converter 4, and the trigger impulse terminal of driver for isolating 1 links to each other with the gate pole G of power switch T1 in the power converter 4.
2, according to the described a kind of power converter power switch over-current detector of claim 1, it is characterized in that: fast diode D1, D2, D3, D4 are fast quick-recovery type, and reverse blocking voltage is greater than 500VAC, and the value of filter capacitor C1 is 10-20pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01246336 CN2494570Y (en) | 2001-07-05 | 2001-07-05 | Power switch overcurrent detector for power inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01246336 CN2494570Y (en) | 2001-07-05 | 2001-07-05 | Power switch overcurrent detector for power inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2494570Y true CN2494570Y (en) | 2002-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01246336 Expired - Fee Related CN2494570Y (en) | 2001-07-05 | 2001-07-05 | Power switch overcurrent detector for power inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2494570Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7646619B2 (en) | 2005-06-17 | 2010-01-12 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling power converter |
| CN101867360A (en) * | 2009-04-15 | 2010-10-20 | 昆山乐美文具有限公司 | Power output switching circuit |
-
2001
- 2001-07-05 CN CN 01246336 patent/CN2494570Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7646619B2 (en) | 2005-06-17 | 2010-01-12 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling power converter |
| US7843710B2 (en) | 2005-06-17 | 2010-11-30 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling power converter |
| CN101888188B (en) * | 2005-06-17 | 2012-08-29 | 三星电子株式会社 | Apparatus and method for controlling power converter |
| CN101867360A (en) * | 2009-04-15 | 2010-10-20 | 昆山乐美文具有限公司 | Power output switching circuit |
| CN101867360B (en) * | 2009-04-15 | 2013-04-24 | 真彩文具股份有限公司 | Power output switching circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |