CN201219254Y - Negative voltage migration circuit - Google Patents
Negative voltage migration circuit Download PDFInfo
- Publication number
- CN201219254Y CN201219254Y CNU2008200881517U CN200820088151U CN201219254Y CN 201219254 Y CN201219254 Y CN 201219254Y CN U2008200881517 U CNU2008200881517 U CN U2008200881517U CN 200820088151 U CN200820088151 U CN 200820088151U CN 201219254 Y CN201219254 Y CN 201219254Y
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Abstract
The utility model relates to a signal conversion circuit, particularly to a drive and an overcurrent control protective circuit suitable for IGBT power device. The problems to be solved are that, the provided circuit performs reliable conversion on the negative voltage signals in a wide amplitude range, with simple structure and low cost. The technical scheme is that, a circuit voltage VCC of a negative voltage bias circuit is accessed in turn with a power source S1 and at least a diode in forward serial connection, an output end of the diode and a ground terminal of the circuit are used as a positive voltage output end; and tube drop sum of the diode is larger than or equal to absolute value of negative voltage. Current source S1 is a resistance. Provided is a negative voltage bias circuit, the circuit voltage VCC of which is accessed in series with the current source S1 and the resistance R2, the output end of the resistance R2 and the circuit ground terminal are used as the negative voltage input end, the input end of the resistance R2 and the circuit ground terminal are used as the positive voltage output end.
Description
Technical field
The utility model relates to a kind of signaling conversion circuit, is particularly useful for the driving and the overcurrent control protection electric circuit of IGBT (igbt) power device.
Background technology
In the power control circuit, need special change-over circuit negative voltage signal is transformed into positive voltage signal, and keep original signal characteristic.Conventional change-over circuit adopts operational amplifier to realize mostly; The following dual mode of general use:
1, adopts the conversion regime of the operational amplifier of duplicate supply.This mode can be accurately and is realized that reliably negative voltage signal arrives the conversion of positive voltage signal; But need positive and negative two groups of power supplys, circuit complexity, cost height.
2, adopt the conversion regime of the operational amplifier of single supply.This mode has been saved one group of negative supply; But be subjected to the characteristic limitations of operational amplifier, can not to be lower than-negative voltage signal of 0.3V handles.
The utility model content
Technical problem to be solved in the utility model provides a kind of improvement of negative voltage migration circuit, this circuit should be able to overcome the deficiency of above-mentioned background technology, can in than wide amplitude range, reliably change, and have simple in structure, lower-cost characteristics negative voltage signal.
The technical scheme that the utility model provides is:
A kind of negative voltage migration circuit, insert at least one diode of current source S1 and forward serial connection on its circuit voltage VCC successively, the output of diode and circuit ground end are as the negative voltage input, and the input of diode and circuit ground end are as positive voltage output end; And the tube voltage drop sum of diode should be more than or equal to the absolute value of negative voltage.
Described current source S1 is a resistance.
A kind of negative voltage migration circuit, its circuit voltage VCC are connected successively and are inserted current source S1 and resistance R 2, and the output of resistance R 2 and circuit ground end are as the negative voltage input, and the input of resistance R 2 and circuit ground end are as positive voltage output end.
Operation principle of the present utility model is: utilize the on state characteristic of diode, when applying the setting electric current that is produced by current source S1 on diode D1, the voltage Vd1 on the diode fixes.
And output voltage V out=Vin+Vd1,
When the absolute value of Vin (negative voltage input signal) during less than Vd1, negative Vin will be displaced to more than the 0V, use for other circuit;
When the absolute value of Vin during greater than Vd1, owing to adopt the mode of many diodes series connection, the corresponding increase of voltage deviation.
In addition, after described current source adopted resistance, electric current wherein can be subjected to the variation of Vin and change, but because the characteristic of diode, and within the specific limits, this variation is with reduced and ignore.
The negative voltage migration circuit that the utility model provides not only can carry out the reliable conversion of negative voltage signal, and voltage deviation can be realized increase by a relatively large margin as required; And entire circuit is simple and practical only with basic resistance, diode composition, has also reduced manufacturing cost.
Description of drawings
Fig. 1 is the electrical block diagram of one of embodiment of the present utility model.
Fig. 2 is two the electrical block diagram of embodiment of the present utility model.
Fig. 3 is three the electrical block diagram of embodiment of the present utility model.
Embodiment
Among the embodiment shown in Figure 1, insert at least one diode D1 of current source S1 and forward serial connection on the circuit voltage VCC (direct-current working volts) of this negative voltage migration circuit successively, the output of diode and circuit ground end are as negative voltage input Vin, and the input of diode and circuit ground end are as positive voltage output end Vont.The quantity of the diode of forward serial connection can determine as required, but the principle of following be the tube voltage drop sum of diode should be more than or equal to the absolute value of negative voltage.
Described current source S1 is can be the triode current source, or the resistor current source, and these all are conventional element circuits, can directly select for use.
Among the embodiment shown in Figure 2, be to adopt resistance R 1 as current source with the difference of Fig. 1; Because after adopting resistance, electric current wherein can change because of the variation of Vin, within the specific limits, this variation is with reduced and ignore.
Among the embodiment shown in Figure 3, be to adopt resistance R 2 to replace diode D1 with the difference of Fig. 1; The resistance of resistance R 2 should be selected appropriately in this scheme, makes the pressure drop at resistance two ends more than or equal to the absolute value of negative voltage.
Claims (3)
1, a kind of negative voltage migration circuit, it is characterized in that inserting successively on its circuit voltage (VCC) at least one diode (D1) of current source (S1) and forward serial connection, the output of diode and circuit ground end are as the negative voltage input, and the input of diode and circuit ground end are as positive voltage output end; And the tube voltage drop sum of diode should be more than or equal to the absolute value of negative voltage.
2, a kind of negative voltage migration circuit according to claim 1 is characterized in that described current source (S1) is resistance (R1).
3, a kind of negative voltage migration circuit, it is characterized in that its circuit voltage (VCC) is connected successively inserts current source (S1) and resistance (R2), the output of resistance (R2) and circuit ground end are as the negative voltage input, and the input of resistance (R2) and circuit ground end are as positive voltage output end; The voltage drop at resistance two ends is more than or equal to the absolute value of negative voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200881517U CN201219254Y (en) | 2008-06-11 | 2008-06-11 | Negative voltage migration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200881517U CN201219254Y (en) | 2008-06-11 | 2008-06-11 | Negative voltage migration circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201219254Y true CN201219254Y (en) | 2009-04-08 |
Family
ID=40542088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200881517U Expired - Lifetime CN201219254Y (en) | 2008-06-11 | 2008-06-11 | Negative voltage migration circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201219254Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295973B (en) * | 2008-06-11 | 2010-04-07 | 浙江西盈科技有限公司 | Negative voltage migration circuit |
-
2008
- 2008-06-11 CN CNU2008200881517U patent/CN201219254Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295973B (en) * | 2008-06-11 | 2010-04-07 | 浙江西盈科技有限公司 | Negative voltage migration circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090408 Effective date of abandoning: 20080611 |