CN201975786U - Reverse connection prevention circuit of low-voltage direct-current power supply compressor - Google Patents
Reverse connection prevention circuit of low-voltage direct-current power supply compressor Download PDFInfo
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- CN201975786U CN201975786U CN2010206897450U CN201020689745U CN201975786U CN 201975786 U CN201975786 U CN 201975786U CN 2010206897450 U CN2010206897450 U CN 2010206897450U CN 201020689745 U CN201020689745 U CN 201020689745U CN 201975786 U CN201975786 U CN 201975786U
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Abstract
The utility model provides a reverse connection prevention circuit of a low-voltage direct-current power supply compressor, which comprises a power supply, a field-effect tube, a resistor and a load, wherein the field-effect tube is connected in series between a power supply and the load by the drain electrode and the source electrode of the field-effect tube, and the grid electrode of the field-effect tube is connected with the power supply by the resistor. The reverse connection prevention circuit also comprises a voltage-regulator tube and an integral diode, wherein the voltage-regulator tube is connected between the source electrode and the grid electrode of the field-effect tube; the voltage-regulator tube points to the grid electrode from the source electrode; and the integral diode is connected between the source electrode and the drain electrode of the field-effect tube and points to the drain electrode from the source electrode. According to the reverse connection prevention circuit, the power supply can be protected against reverse connection, and the reverse connection prevention circuit has the advantages of low energy consumption and low cost.
Description
Technical field
The utility model relates to electronic circuit field, relates in particular to a kind of reverse-connection preventing circuit that is used for the compressor drive of low-voltage DC supply, belongs to technical field of automatic control.
Background technology
Motor in the existing low-voltage DC supply compressor assembly, compressor adopts permagnetic synchronous motor, controls by the rotating speed that carries out of variable frequency drives.Driver is input as direct current, and generally this quasi-driver does not possess anti-reverse function, when driver input end both positive and negative polarity wrong, can cause the damage of driver, therefore, needs reverse-connection preventing circuit that driver is protected.
At present general reverse-connection preventing circuit is to adopt diode circuit that is connected in series, and utilizes the unidirectional conduction of diode to reach the purpose that prevents power supply reversal connection damage equipment.Fig. 1 shows prior art, adopts the circuit diagram of diode discharge source reversal connection.As shown in the figure, diode D is serially connected between circuit V1 and the load RL, when power supply V1 normally inserts, and diode D conducting, load RL work; When power supply V1 reversal connection, diode D repercussion ends, and does not have electric current to flow through in the circuit, has reached the purpose of protection load.
But; adopt the diode protection load that inevitable defective is arranged; for low voltage application; because there is fixing pressure drop in diode; when described reversal connection circuit application during at big current work environment, the fixing pressure drop of diode consumes bigger power, the heat radiation difficulty; circuit reliability reduces, and power-efficient is not high.Particularly for the low-voltage dc power supply of routine, mainly be 48V or 24V, when compressor operating, the driver input current is bigger, generally reach tens A even bigger, just need a bigger radiator to help diode to dispel the heat with the reverse-connection preventing circuit of prior art.
Fig. 2 shows the another kind of scheme of prior art, with the circuit of the anti-power supply reversal connection of field effect transistor serial connection, during its maximum not enough, when supply voltage is less than or equal to the cut-in voltage of field effect transistor, the metal-oxide-semiconductor cisco unity malfunction can not be applicable in the circuit with low power supply power supply.
Therefore, provide a kind of big electric current is passed through, the not impaired reverse-connection preventing circuit of protection driver just seems particularly important.
The utility model content
In view of the problem that above-mentioned prior art exists, the purpose of this utility model provides a kind of compressor drive reverse-connection preventing circuit of low-voltage DC supply, avoiding unnecessary circuit loss, and improves circuit reliability.
To achieve these goals, the utility model provides a kind of low-voltage DC supply compressor drive reverse-connection preventing circuit, comprise power supply, one field effect transistor, one resistance and load, wherein, described power supply one end connects the drain electrode of described field effect transistor, the other end connects the source electrode of described field effect transistor by described load, and described power supply also connects the grid of described field effect transistor by described resistance; One voltage-stabiliser tube is connected between the source electrode and grid of described field effect transistor, and is connected between described resistance and the load, described voltage-stabiliser tube points to grid from source electrode, one body diode is attempted by between the source electrode and drain electrode of described field effect transistor, and described body diode points to drain electrode from source electrode.
Above-mentioned reverse-connection preventing circuit, wherein, the burning voltage span of described voltage-stabiliser tube is 12V ~ 15V.
Above-mentioned reverse-connection preventing circuit, wherein, described load is a variable frequency drives.
Above-mentioned reverse-connection preventing circuit, wherein, described field effect transistor model is IR4368, IRFP4468, IRFP3077, IRF1404, IRF2804, RF4104 or IR4368.
The utility model has the advantages that: be beneficial to the conducting and the disconnection of the switching characteristic control circuit of power field effect pipe, because the internal resistance of power field effect pipe is extremely low, effect control better helps heat dissipation, energy conservation.
Description of drawings
Fig. 1 shows the circuit for preventing reverse connection of power supply figure according to prior art;
Fig. 2 shows the another kind of circuit for preventing reverse connection of power supply figure according to prior art; And
Fig. 3 shows according to of the present utility model, a kind of compressor drive reverse-connection preventing circuit of low-voltage DC supply.
Embodiment
The compressor drive reverse-connection preventing circuit of a kind of low-voltage DC supply that goes out as shown in Figure 3.Particularly, described reverse-connection preventing circuit comprises power supply V1, a field effect transistor M, a resistance R, load RL, voltage-stabiliser tube D2 and body diode D3.More specifically, described field effect transistor M is connected between power supply V1 and the load RL by its drain D and source S, wherein, the drain D of described field effect transistor M connects described power supply V1, the source S of described field effect transistor M connects described load RL, and the grid G of described field effect transistor M connects described power supply V1 by described resistance R, described voltage-stabiliser tube D2, be connected between the source S and grid G of described field effect transistor M, described voltage-stabiliser tube D2 points to grid G from source S; Described body diode D3 is connected between the source electrode G and drain D of described field effect transistor M, and described body diode D3 is in parallel with described field effect transistor, and described body diode D3 points to drain D from source electrode G.
Preferably, the burning voltage span of described voltage-stabiliser tube D2 is 12V ~ 15V.
In a preference, the model of described field effect transistor M is IR4368, the model of described field effect transistor M can also be selected other different models as required for use, for example it will be appreciated by those skilled in the art that, when described low-voltage dc power supply is 48V, can adopt model is that to replace described model be IR4368 field effect transistor M for the field effect transistor of IRFP4468 or IRFP3077, when described low-voltage dc power supply was 24V, should choose model was IRF1404, the field effect transistor of IRF2804 or IRF4104.Described variation does not influence the enforcement of present embodiment, does not repeat them here.
In a specific embodiment, described load RL is a variable frequency drives, be mainly used on the low-voltage variable frequency air-conditioning driver according to anti-power supply reversal connection circuit of the present utility model, further, those skilled in the art understand, electric component in the foregoing description is applicable to that the application of described anti-power supply reversal connection circuit not only is confined to this on the 48 low-voltage variable frequency air-conditioning drivers, can also be applied in as required in other loads.
Below in conjunction with Fig. 3 concrete enforcement of the present utility model is described; during the normal place in circuit of power supply V1; as shown in Figure 3; power supply V1 output plus terminal connects resistance R; power supply V1 output negative terminal connects the drain D of field effect transistor M, and voltage is 12V between the grid of field effect transistor and source electrode (G-S), and voltage-stabiliser tube D2 plays pressure stabilization function; resistance R plays metering function, and protection voltage-stabiliser tube D2 can not burn out because electric current is excessive.Because field effect transistor M has two-way admittance, as voltage Vgs between the grid of field effect pipe M and source electrode (G-S) during greater than the cut-in voltage of field effect transistor, conducting between source electrode-drain electrode (S-D), electric current flows through driver RL and source electrode-drain electrode (S-D).Owing to there is reverse parallel connection body diode D3, when flowing through reverse current, because the equivalent resistance between source electrode-drain electrode (S-D) is very little, usually have only several milliohms, so very for a short time forward threshold voltage that is not enough to overcome body diode D3 of voltage Vsd between source electrode-drain electrode (S-D), not conducting of body diode D3, the electric current conducting channel of flowing through has been realized low-loss purpose.
When the input DC power reversal connection, the both positive and negative polarity of power supply V1 as shown in Figure 3 transposing, between the grid of described field effect transistor M and source electrode (G-S) voltage Vgs less than cut-in voltage, thereby not conducting of field effect transistor M conducting channel, electric current can't pass through.In addition, the body diode D3 of field effect transistor M also oppositely ends, and the two ends of driver RL all do not have voltage, can play a very good protection to driver.
More than specific embodiment of the utility model is described.It will be appreciated that the utility model is not limited to above-mentioned specific implementations, wherein equipment of not describing in detail to the greatest extent and structure are construed as with the common mode in this area and are implemented; Those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present utility model.
Claims (4)
1. low-voltage DC supply compressor drive reverse-connection preventing circuit, comprise power supply, one field effect transistor, one resistance and load, it is characterized in that, described power supply one end connects the drain electrode of described field effect transistor, and the other end connects the source electrode of described field effect transistor by described load, and described power supply also connects the grid of described field effect transistor by described resistance; One voltage-stabiliser tube is connected between the source electrode and grid of described field effect transistor, and is connected between described resistance and the load, described voltage-stabiliser tube points to grid from source electrode, one body diode is attempted by between the source electrode and drain electrode of described field effect transistor, and described body diode points to drain electrode from source electrode.
2. reverse-connection preventing circuit according to claim 1 is characterized in that, the burning voltage span of described voltage-stabiliser tube is 12V ~ 15V.
3. reverse-connection preventing circuit according to claim 1 and 2 is characterized in that, described load is a variable frequency drives.
4. according to claim 1 or 3 described reverse-connection preventing circuits, it is characterized in that described metal-oxide-semiconductor field effect transistor comprises following any model:
IRFP4368；
IRFP4468；
IRFP3077?；
IRF1404；
IRF2804; Or
IRF4104。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206897450U CN201975786U (en) | 2010-12-30 | 2010-12-30 | Reverse connection prevention circuit of low-voltage direct-current power supply compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206897450U CN201975786U (en) | 2010-12-30 | 2010-12-30 | Reverse connection prevention circuit of low-voltage direct-current power supply compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201975786U true CN201975786U (en) | 2011-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206897450U Expired - Lifetime CN201975786U (en) | 2010-12-30 | 2010-12-30 | Reverse connection prevention circuit of low-voltage direct-current power supply compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201975786U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441486A (en) * | 2013-08-14 | 2013-12-11 | 上海华兴数字科技有限公司 | Reverse-connection-prevention protective circuit of high current power supply |
| CN104832441A (en) * | 2015-04-27 | 2015-08-12 | 成都芯进电子有限公司 | Integrated reverse connection protection single-coil direct-current brushless fan driver |
-
2010
- 2010-12-30 CN CN2010206897450U patent/CN201975786U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441486A (en) * | 2013-08-14 | 2013-12-11 | 上海华兴数字科技有限公司 | Reverse-connection-prevention protective circuit of high current power supply |
| CN104832441A (en) * | 2015-04-27 | 2015-08-12 | 成都芯进电子有限公司 | Integrated reverse connection protection single-coil direct-current brushless fan driver |
| CN104832441B (en) * | 2015-04-27 | 2017-01-25 | 成都芯进电子有限公司 | Integrated reverse connection protection single-coil direct-current brushless fan driver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110914 |