CN204424953U - A kind of DC power supply output device and protective circuit - Google Patents
A kind of DC power supply output device and protective circuit Download PDFInfo
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- CN204424953U CN204424953U CN201520048002.8U CN201520048002U CN204424953U CN 204424953 U CN204424953 U CN 204424953U CN 201520048002 U CN201520048002 U CN 201520048002U CN 204424953 U CN204424953 U CN 204424953U
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Abstract
The utility model relates to a kind of DC power supply output device and protective circuit.DC power supply output device comprises one for controlling the protective device that electric current exports, and the two ends of protective device are connected to the input adapter for being connected with DC power supply and the out splice going splice for being connected with load.Protective circuit comprise for detect electric current export size current detection circuit, for control electric current export switch module and MCU; Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal.MCU is according to the operating state of curent change control switch module.In the technical program, because protective device is external, DC power supply output device can apply multiple occasion, conveniently adjusts protective device; Secondly, protective circuit according to the change of the feature monitoring output current of DC electric apparatus, and can carry out control switch according to the change of electric current, and then reaches better protected effect.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of DC power supply output device and the protective circuit for DC electric apparatus.
Background technology
It is a portable multifunctional portable power source developed to the love car personage of trip of driving and business people that car emergency starts power supply.Its featured function can start automobile when being and cannot starting automobile for automobile punching electricity or other reasons, and combined with the function such as emergency power supply, outdoor lighting by inflator pump, be one of product of outdoor trip indispensability simultaneously.
Current car emergency starts power supply when exporting, and can arrange a protective circuit at power source internal, the electric current exported by protective circuit restriction, and control power supply exports.
When power supply correspondence outputs to different loads, need to adjust it, but current protective circuit is generally integrated into power supply place, therefore comparatively complicated to its amendment, be not suitable for being applied to multiple occasion.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and provide a kind of DC power supply output device, this DC power supply output device is easy to use, is convenient to adjustment.
Another object of the present utility model is: provide a kind of protective circuit for DC electric apparatus, and this protective circuit can start DC electric apparatus by big current, and can overcurrent protection.
The technical solution adopted in the utility model is:
A kind of DC power supply output device, comprise one for controlling the protective device that electric current exports, the two ends of protective device are connected to the input adapter for being connected with DC power supply and the out splice going splice for being connected with load.
Further, the input of described protective device is provided with the input adapter matched with power output terminal, and during use, DC power supply is provided with power output terminal, input adapter and power output terminal grafting.
Further, be provided with protective circuit in described protective device, its protective circuit comprises
Current detection circuit, for detecting the size that electric current exports;
Switch module, exports for controlling electric current;
And MCU;
Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal; When current detection circuit detects starting current at the scheduled time outer overcurrent, MCU control switch module disconnects; When current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects.
Further, described protective circuit also comprises the voltage detecting circuit for detecting input power, and voltage detecting circuit is connected with the signal end signal of MCU; When voltage detecting circuit detects that the voltage of input power is less than predetermined value, MCU control switch module disconnects.
Further, described current detection circuit comprises detection resistance R3, and two signal ends of MCU are connected with two end signals detecting resistance R3 respectively.
Further, described voltage detecting circuit comprises resistance R1 and resistance R2, and the electrode input end of protective circuit is connected with negative input by resistance R1, resistance R2 successively, and two signal ends of MCU are connected with two end signals of resistance R2 respectively.
Further, described protective circuit also comprises power supply holding circuit, and described power supply holding circuit comprises diode D1 and electric capacity C1, and the electrode input end of protective circuit is connected by the power end of diode D1 and MCU, and the power end of MCU is by electric capacity C1 ground connection.
The beneficial effect that the utility model obtains is: in the technical program, and because protective device is external, DC power supply output device can apply multiple occasion, conveniently adjusts protective device; Secondly, protective circuit according to the change of the feature monitoring output current of DC electric apparatus, and can carry out control switch according to the change of electric current, and then reaches better protected effect.
Accompanying drawing explanation
Fig. 1 is protective circuit schematic diagram of the present utility model.
Fig. 2 is a kind of structural representation of the present utility model.
Fig. 3 is the structural representation of the utility model and DC power supply, load.
SW1 in accompanying drawing represents switch module.
Reference numeral:
1---DC power supply 21---input adapter 2---protective device
22---out splice going splice 3---load.
Embodiment
Embodiment 1: see Fig. 1, Fig. 2, Fig. 3.
A kind of DC power supply output device, comprise one for controlling the protective device 2 that electric current exports, the two ends of protective device 2 are connected to the input adapter 21 for being connected with DC power supply 1 and the out splice going splice 22 for being connected with load 3.In the specific implementation, directly by input adapter 21 and DC power supply 1 grafting; Out splice going splice 22 and load 3 grafting.Easy to operate.Out splice going splice 22 in the specific implementation, can adopt the structure of power folder, as shown in Figure 2.During use, DC power supply 1 is connected with out-put supply line by protective device 2.The technical program, by external for protective device 2, in use, can regulate protective device 2 according to load 3, easy to use.
As shown in Figure 2 and Figure 3, described DC power supply 1 is provided with power output terminal, and the input of described protective device 2 is provided with the input adapter 21 matched with power output terminal, input adapter 21 and power output terminal grafting.One end of out-put supply line is connected with the output of protective device 2, and the other end of out-put supply line connects out splice going splice 22.
Adopt out splice going splice 22, the connection being convenient to power line exports.As out splice going splice 22 being plugged in the power input of load 3, easy to operate.
Further, be provided with protective circuit in described protective device 2, its protective circuit comprises
Current detection circuit, for detecting the size that electric current exports;
Switch module, exports for controlling electric current;
And MCU;
Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal; When current detection circuit detects starting current at the scheduled time outer overcurrent, MCU control switch module disconnects; When current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects.
Further, described protective circuit also comprises the voltage detecting circuit for detecting input power, and voltage detecting circuit is connected with the signal end signal of MCU; When voltage detecting circuit detects that the voltage of input power is less than predetermined value, MCU control switch module disconnects.
Further, described current detection circuit comprises detection resistance R3, and two signal ends of MCU are connected with two end signals detecting resistance R3 respectively.
Further, described voltage detecting circuit comprises resistance R1 and resistance R2, and the electrode input end of protective circuit is connected with negative input by resistance R1, resistance R2 successively, and two signal ends of MCU are connected with two end signals of resistance R2 respectively.
Further, described protective circuit also comprises power supply holding circuit, and described power supply holding circuit comprises diode D1 and electric capacity C1, and the electrode input end of protective circuit is connected by the power end of diode D1 and MCU, and the power end of MCU is by electric capacity C1 ground connection.
Embodiment 2: see Fig. 1.
For a protective circuit for DC electric apparatus, comprise the current detection circuit for detecting electric current output size, for controlling switch module and the MCU of electric current output; Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal; When current detection circuit detects starting current at the scheduled time outer overcurrent, MCU control switch module disconnects; When current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects.MCU is according to the operating state of the change control switch module of electric current.
The technical program, when implementing, is arranged between electric current input and load 3 output, as between DC power supply 1 and d.c. motor; When DC power supply 1 input direct-current, MCU is detected flowing through electric current by current detection circuit, the value (i.e. overcurrent) that MCU allows the electric current flowed through to reach higher in scheduled time T1, the T1 time determined according to the normal start-up time of electrical equipment, different electrical equipment, start-up time, (scheduled time T1) differed.Now circuit presents over-current phenomenon avoidance.When after the T1 time, if when MCU is also in higher value by the electric current that current detection circuit detects, exceed normal value, MCU control switch module disconnects, and stop electric current exporting, electrical equipment quits work.If electric current returns in normal range (NR), then maintained switch module closes, and forms path.Secondly when current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects, and predetermined value can be calculated according to load 3, different loads 3, and predetermined value is different.Detected the situation of change of electric current by MCU, be used as the foundation of protective circuit work with this, both can realize overcurrent and start, the object of overcurrent protection can be realized again.
Further, described protective circuit also comprises the voltage detecting circuit for detecting input power, and voltage detecting circuit is connected with the signal end signal of MCU; When voltage detecting circuit detects that the voltage of input power is less than predetermined value, MCU control switch module disconnects.
Voltage detecting circuit is set, can detects the operating voltage of load 3; Its rated operational voltage of different loads 3 is different, and therefore predetermined value is also different; When the output voltage of power supply is too low, MCU control switch module disconnects.Avoid the damage to input power.Until stable operating voltage is in normal region, control switch module closes, loaded work piece.
Further, described current detection circuit comprises detection resistance R3, and two signal ends of MCU are connected with two end signals detecting resistance R3 respectively.
When specific works, detecting resistance R3 serial connection in the loop, by detecting the voltage difference at its two ends, obtaining the size of current flowed through.Detect resistance R3 and can make micro-impedance, such current detection circuit can not have impact to the electric current exported, and namely avoids shunting; Improve the utilance of electric energy.
Further, described voltage detecting circuit comprises resistance R1 and resistance R2, and the electrode input end of protective circuit is connected with negative input by resistance R1, resistance R2 successively, and two signal ends of MCU are connected with two end signals of resistance R2 respectively.
Resistance R1, R2 carry out voltage detecting to input power, and resistance R1, R2 play a dividing potential drop effect, and MCU mainly detects the voltage of resistance R2, and then reach the voltage detecting and export, according to the operating state of voltage cut-out module.
Further, described protective circuit also comprises power supply holding circuit, and described power supply holding circuit comprises diode D1 and electric capacity C1, and the electrode input end of protective circuit is connected by the power end of diode D1 and MCU, and the power end of MCU is by electric capacity C1 ground connection.
When protective circuit normally works, electrode input end, by diode D1 and electric capacity C1 ground connection, charges, while power to MCU to electric capacity C1; When there is load 3 short circuit, because the isolation of diode D1, electric capacity C1 can carry out the power supply of short time to MCU, namely MCU can also work on, and now MCU control switch module disconnects, cut-off loop.Such power up is powered to MCU and is charged to electric capacity C1, thus keeps protective circuit always in running order.
Switch module can select electromagnetic switch etc.
Below be only the preferred embodiment of the application, equivalent technical solutions on this basis still falls into application protection range.
Claims (8)
1.
a kind of DC power supply output device, is characterized in that: comprise one for controlling the protective device that electric current exports, the two ends of protective device are connected to the input adapter for being connected with DC power supply and the out splice going splice for being connected with load;
Be provided with protective circuit in described protective device, its protective circuit comprises
Current detection circuit, for detecting the size that electric current exports;
Switch module, exports for controlling electric current;
And MCU;
Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal; When current detection circuit detects starting current at the scheduled time outer overcurrent, MCU control switch module disconnects; When current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects.
2.
a kind of DC power supply output device according to claim 1, is characterized in that: described protective circuit also comprises the voltage detecting circuit for detecting input power, and voltage detecting circuit is connected with the signal end signal of MCU; When voltage detecting circuit detects that the voltage of input power is less than predetermined value, MCU control switch module disconnects; Described current detection circuit comprises detection resistance R3, and two signal ends of MCU are connected with two end signals detecting resistance R3 respectively.
3.
a kind of DC power supply output device according to claim 2; it is characterized in that: described voltage detecting circuit comprises resistance R1 and resistance R2; the electrode input end of protective circuit is connected with negative input by resistance R1, resistance R2 successively, and two signal ends of MCU are connected with two end signals of resistance R2 respectively.
4.
a kind of DC power supply output device according to claim 3; it is characterized in that: described protective circuit also comprises power supply holding circuit; described power supply holding circuit comprises diode D1 and electric capacity C1; the electrode input end of protective circuit is connected by the power end of diode D1 and MCU, and the power end of MCU is by electric capacity C1 ground connection.
5. a protective circuit, is characterized in that: comprise
Current detection circuit, for detecting the size that electric current exports;
Switch module, exports for controlling electric current;
And MCU;
Current detection circuit is connected with the signal end signal of MCU, and the control end of MCU is connected with switch module signal;
When current detection circuit detects starting current at the scheduled time outer overcurrent, MCU control switch module disconnects; When current detection circuit detects that electric current is less than predetermined value, MCU control switch module disconnects.
6.
a kind of protective circuit according to claim 5, is characterized in that: described protective circuit also comprises the voltage detecting circuit for detecting input power, and voltage detecting circuit is connected with the signal end signal of MCU; When voltage detecting circuit detects that the voltage of input power is less than predetermined value, MCU control switch module disconnects; Described current detection circuit comprises detection resistance R3, and two signal ends of MCU are connected with two end signals detecting resistance R3 respectively.
7.
a kind of protective circuit according to claim 6; it is characterized in that: described voltage detecting circuit comprises resistance R1 and resistance R2; the electrode input end of protective circuit is connected with negative input by resistance R1, resistance R2 successively, and two signal ends of MCU are connected with two end signals of resistance R2 respectively.
8.
a kind of protective circuit according to claim 7; it is characterized in that: described protective circuit also comprises power supply holding circuit; described power supply holding circuit comprises diode D1 and electric capacity C1; the electrode input end of protective circuit is connected by the power end of diode D1 and MCU, and the power end of MCU is by electric capacity C1 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520048002.8U CN204424953U (en) | 2015-01-23 | 2015-01-23 | A kind of DC power supply output device and protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520048002.8U CN204424953U (en) | 2015-01-23 | 2015-01-23 | A kind of DC power supply output device and protective circuit |
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| CN204424953U true CN204424953U (en) | 2015-06-24 |
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| CN201520048002.8U Active CN204424953U (en) | 2015-01-23 | 2015-01-23 | A kind of DC power supply output device and protective circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019884A (en) * | 2021-11-16 | 2022-02-08 | Tcl家用电器（合肥）有限公司 | Household appliance power consumption control circuit and household appliance |
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2015
- 2015-01-23 CN CN201520048002.8U patent/CN204424953U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019884A (en) * | 2021-11-16 | 2022-02-08 | Tcl家用电器（合肥）有限公司 | Household appliance power consumption control circuit and household appliance |
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