CN203491885U

CN203491885U - Vehicle power supply

Info

Publication number: CN203491885U
Application number: CN201320526608.9U
Authority: CN
Inventors: 徐建华
Original assignee: Shenzhen Lvsun Electronic Technology Co ltd
Current assignee: Shenzhen Lvsun Electronic Technology Co ltd
Priority date: 2013-08-27
Filing date: 2013-08-27
Publication date: 2014-03-19
Anticipated expiration: 2023-08-27

Abstract

The utility model discloses a vehicle power supply. The vehicle power supply includes an input filter circuit, a DC-DC boost circuit, an output filter circuit and an MCU single chip microcomputer automatic identification control circuit. The input filter circuit is provided with an input terminal capable of connecting with an external power supply, an output terminal of the input filter circuit is electrically connected with an input terminal of the DC-DC boost circuit, an output terminal of the DC-DC boost circuit is electrically connected with an input terminal of the output filter circuit, and the MCU single chip microcomputer automatic identification control circuit is electrically connected with the DC-DC boost circuit. The vehicle power supply is high in transformation rate, small in size, and also can be used for charging most of different brands of mobile phones and supplying power for digital devices at present.

Description

Vehicle power

Technical field

The utility model relates to the electric supply installation of electronic product, particularly vehicle power.

Background technology

Society, the digital products such as mobile phone, digital camera, electronic reader, MP3, MP4 emerge in an endless stream, and these electronic products are also that it is thinner to do less and less, and it is more and more that function becomes.And input power size does not have too many minimizing, and function singleness.

Utility model content

The purpose of this utility model is to provide the vehicle power that a kind of volume is little, easy to use.

In order to achieve the above object, according to an aspect of the present utility model, a kind of vehicle power is provided, comprise input filter circuit, DC-DC booster circuit, output filter circuit and the automatic recognition control circuit of MCU single-chip microcomputer, input filter circuit is provided with the input that can be connected with external power source, the output of input filter circuit is electrically connected to the input of DC-DC booster circuit, the output of DC-DC booster circuit is electrically connected to the input of output filter circuit, and the automatic recognition control circuit of MCU single-chip microcomputer is electrically connected to DC-DC booster circuit.

In some embodiments, also comprise USB circuit, the input of USB circuit is electrically connected to the output of input filter circuit, and the automatic recognition control circuit of MCU single-chip microcomputer is electrically connected to USB circuit.Its beneficial effect is, the power consumption equipment of charging that can adaptive multiple employing USB input.

In some embodiments, DC-DC booster circuit comprises DC-DC synchronous boost control circuit and DC-DC synchronous boost switching circuit, the input of DC-DC synchronous boost control circuit is electrically connected to input filter circuit, the input of the output of DC-DC synchronous boost control circuit and DC-DC synchronous boost switching circuit is electrically connected to, and the output of DC-DC synchronous boost switching circuit is electrically connected to output filter circuit.Its beneficial effect is can improve conversion efficiency, minimizing volume.

In some embodiments, DC-DC synchronous boost switching circuit comprises on end switch under DC-DC synchronous boost, DC-DC synchronous boost end switch on end switch and isolation drive DC-DC synchronous boost.Its beneficial effect is can improve conversion efficiency, minimizing volume.

Accompanying drawing explanation

Fig. 1 is the Vehicular power system block diagram of a kind of execution mode of the utility model;

Fig. 2 is the circuit theory diagrams of the utility model vehicle power.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1-2 has schematically shown according to a kind of vehicle power of the utility model one execution mode.As shown in the figure, vehicle power of the present utility model comprises: the automatic recognition control circuit 4 of input filter circuit 1, DC-DC booster circuit 2, output filter circuit 3 and MCU single-chip microcomputer, input filter circuit 1 is provided with the input that can be connected with external power source, the output of input filter circuit 1 is electrically connected to the input of DC-DC booster circuit 2, the output of DC-DC booster circuit 2 is electrically connected to the input of output filter circuit 3, and the automatic recognition control circuit 4 of MCU single-chip microcomputer is electrically connected to DC-DC booster circuit 2.

Owing to having in current digital electronic goods, be USB access port greatly, so this vehicle power also comprises USB circuit 5, USB circuit 5 is 5V2A circuit, the input of USB circuit 5 is electrically connected to the output of input filter circuit 1, and the automatic recognition control circuit 4 of MCU single-chip microcomputer is electrically connected to USB circuit 5.

DC-DC booster circuit 2 comprises DC-DC synchronous boost control circuit 6 and DC-DC synchronous boost switching circuit 7, the input of DC-DC synchronous boost control circuit 6 is electrically connected to input filter circuit 1, the input of the output of DC-DC synchronous boost control circuit 6 and DC-DC synchronous boost switching circuit 7 is electrically connected to, and the output of DC-DC synchronous boost switching circuit 7 is electrically connected to output filter circuit 3.DC-DC synchronous boost switching circuit 7 comprises on end switch 8 under DC-DC synchronous boost, DC-DC synchronous boost end switch 10 on end switch 9 and isolation drive DC-DC synchronous boost.Can also improve conversion efficiency like this, reduce volume.

As shown in Figure 2,1CON1,1C1, LF1, E1, E2 form input filter circuit 1, and the chip that the model that 1U1Wei MPS company produces is MP3908,1R1,1C2,1C3,1R2,1R3,1R4,1R5,1Q1 form DC-DC synchronous boost control circuit 6.1Q2 is that chip, 1Q3, the 1Q4 that the model of AOS production is AO4184 forms end switch 8 under DC-DC synchronous boost.1Q5 is that chip, 1Q6, the 1Q7 that the model of AOS production is AO4184 forms end switch 9 on DC-DC synchronous boost.1C10, LF3 form end switch 10 on isolation drive DC-DC synchronous boost.1C15,1C16,1C17, LF2,1Q8,1Q9, CON2 form output filter circuit 3.1U3,1U4,1R22,1R23,1R24,2R23,2R24,2C6 etc. form the automatic recognition control circuit 4 of MCU single-chip microcomputer.

Synchronous boost is controlled as follows:

The chip that the model that 1U1Wei MPS company produces is MP3908, the 9th pin and the 10th pin of 1U1 are exported the pulse-modulated signal of a pair of complementation, when the 9th pin high level of 1U1, now 1Q4 will end, and 1Q3 conducting, also conducting accordingly of 1Q2 subsequently, to 1L1 induction charging storage power.When chip the 10th pin that the model that 1U1Wei MPS company produces is simultaneously MP3908 is low level, by isolating transformer LF3, low-voltage is coupled to the base stage of 1Q6, two triodes of 1Q7, now 1Q6 ends and 1Q7 conducting, 1Q5 cut-off subsequently, electric capacity E3, E4,1C14,1C15 provide energy to load.When the 9th pin of 1U1 is low level, now 1Q4 conducting and 1Q3 cut-off, 1Q2 cut-off thereupon.When the 10th pin of 1U1 is high level simultaneously, by isolating transformer LF3, high voltage is coupled to the base stage of 1Q6 and 1Q7, now 1Q6 conducting and 1Q7 cut-off, 1Q5 conducting thereupon, inductance 1L1 releases energy, and to load, provides energy simultaneously to electric capacity E3, E4,1C14,1C15 to charging makeup energy.

Output voltage automatic switching circuit:

When rotary head is changed in main output, single-chip microcomputer 1U4 detects the variation of input voltage by the 14th pin, 1U4 respective pin, the 11st pin 18-18.5V, the 9th pin 19-20V, the 6th pin 22V and the 4th pin 24V are with regard to output LOW voltage, 1U1 Voltage Feedback the 4th pin FB pin reduces resistance over the ground simultaneously, the pulse money modulation duty cycle that causes 1U1 the 9th pin and the 10th pin increases, and output raises, 1U1 Voltage Feedback to the 4 pin FB pin, it is constant that voltage keeps, the constant voltage conforming to output conversion head of output voltage.

The automatic recognition control circuit 4 of MCU single-chip microcomputer:

After output access mobile phone, be defaulted as large current work state >=2.0A, when load is large current charge equipment (as the IPAD of apple or IPOHE mobile phone), large current charge equipment (as apple IPAD or IPOHE mobile phone) charges working properly, and when operating current <1.0A, large current charge equipment (as apple IPAD or IPOHE mobile phone) just can not charge normal.When load is low current charge equipment (as Nokia's mobile phone), understands because of output current >=1.0A, and automatically stop charging.Output current is 0A, and now resistance 2R13 will examine output current variation, then deliver to the 1st pin of single-chip microcomputer 1U4, and the 7th pin of single-chip microcomputer 1U4 is output low level pin, and DC-DC reduction voltage circuit 2U1 is quit work.Now low current charge equipment (as Nokia's mobile phone) will recognize charger disconnection and reset.The 8th pin output high level of single-chip microcomputer 1U4, now 2Q1 will conducting.The 7th pin of 2U1 is that constant current pin resistance to earth reduces.2U1 constant current value reduces by one grade, is reduced to 600mA-900m, for being applicable to low current charge equipment (as Nokia's mobile phone).The 7th pin of single-chip microcomputer 1U4 is output high level pin.DC-DC reduction voltage circuit 2U1 is normally worked, and now low current charge equipment (as Nokia's mobile phone) will charge normal.

Above-described is only execution modes more of the present utility model.For the person of ordinary skill of the art, not departing under the prerequisite of the utility model creation design, can also make some distortion and improvement, these all belong to protection range of the present utility model.

Claims

1. vehicle power, it is characterized in that, comprise input filter circuit (1), DC-DC booster circuit (2), output filter circuit (3) and the automatic recognition control circuit of MCU single-chip microcomputer (4), described input filter circuit (1) is provided with the input that can be connected with external power source, the output of described input filter circuit (1) is electrically connected to the input of described DC-DC booster circuit (2), the output of described DC-DC booster circuit (2) is electrically connected to the input of described output filter circuit (3), the automatic recognition control circuit of described MCU single-chip microcomputer (4) is electrically connected to described DC-DC booster circuit (2).

2. vehicle power according to claim 1, it is characterized in that, also comprise USB circuit (5), the input of described USB circuit (5) is electrically connected to the output of described input filter circuit (1), and the automatic recognition control circuit of described MCU single-chip microcomputer (4) is electrically connected to described USB circuit (5).

3. vehicle power according to claim 2, it is characterized in that, described DC-DC booster circuit (2) comprises DC-DC synchronous boost control circuit (6) and DC-DC synchronous boost switching circuit (7), the input of described DC-DC synchronous boost control circuit (6) is electrically connected to described input filter circuit (1), the input of the output of described DC-DC synchronous boost control circuit (6) and described DC-DC synchronous boost switching circuit (7) is electrically connected to, and the output of described DC-DC synchronous boost switching circuit (7) is electrically connected to described output filter circuit (3).

4. vehicle power according to claim 3, it is characterized in that, described DC-DC synchronous boost switching circuit (7) comprises on end switch under DC-DC synchronous boost (8), DC-DC synchronous boost end switch (10) on end switch (9) and isolation drive DC-DC synchronous boost.