CN203850890U

CN203850890U - Field work charger

Info

Publication number: CN203850890U
Application number: CN201420274243.XU
Authority: CN
Inventors: 李世平
Original assignee: State Grid Sichuan Electric Power Co Chengdu Xindu Power Supply Branch
Current assignee: State Grid Sichuan Electric Power Co Chengdu Xindu Power Supply Branch
Priority date: 2014-05-27
Filing date: 2014-05-27
Publication date: 2014-09-24
Anticipated expiration: 2024-05-27

Abstract

A field work charger comprises a solar cell panel and a first capacitor connected with the solar cell panel in a parallel way. The field work charger further comprises a first triode, a second triode and a transformer. The primary side of the transformer is composed of a primary coil and a feedback coil. The base electrode of the first triode is connected with the collector electrode of the second triode. The first triode is further connected to the positive output stage of the solar cell panel through a first resistor and a boost stage. The collector electrode of the first triode is connected to the positive output stage of the solar cell panel through a second resistor. The emitter electrodes of the first triode and the second triode are both connected with the negative output stage of the solar cell panel. The field work charger can directly use sunshine rays with incessantly changing brightness to charge mobile equipment. The field charging problem of mobile equipment is thus solved. The working time of the mobile equipment is prolonged. The outdoor working efficiency is further improved.

Description

Field work charger

Technical field

The utility model relates to electronic circuit field, particularly, relates to a kind of field work charger.

Background technology

Electric power apparatus examination or workmen patrol and examine throughout the year in the wild, the electronic equipment carrying need to often charge, in most cases, field does not have operational AC socket to use, although carry reserce cell can extension device service time, but after all time expand limited, and carrying of reserce cell also increased personnel's heavy burden.

Solar cell is the device that directly light energy conversion is become to electric energy by photoelectric effect or Photochemical effects.Taking the thin-film type solar cell of photoelectric effect work as main flow, the generating voltage of solar cell can reach 12V conventionally, but the output voltage of solar cell changes with sunlight illumination brightness, and output current is less, can not reach charging requirement.

Utility model content

For overcoming the existing mobile device field inconvenient technological deficiency of charging, the utility model discloses a kind of field work charger.

Field work charger, comprise solar panel, first electric capacity in parallel with solar panel, also comprise the first triode, the second triode and transformer, the former limit of described transformer is made up of primary coil and feedback coil, described the first transistor base is connected with the second transistor collector, and by the first resistance, voltage-boosting stage is connected to solar panel positive output level, the first transistor collector is connected to solar panel positive output level by the second resistance, described the first triode, the emitter of the second triode is all connected with solar panel negative output level,

The base stage of described the first triode is also connected with the starting point of feedback coil with the second electric capacity by the 3rd resistance of series connection, and the terminal of feedback coil connects solar panel negative output level; The starting point of described primary coil, terminal connect respectively solar panel positive output level and the first transistor collector;

Also comprise charge stage, described charge stage is made up of the feedback resistance string and the 3rd electric capacity that are connected in parallel on transformer secondary output coil, between described secondary coil starting point and feedback resistance string, be also connected with rectifier diode, the first diode cathode connects secondary coil starting point, the feedback point of described feedback resistance string connects the base stage of the second triode by voltage stabilizing didoe, the positive pole of described voltage stabilizing didoe connects the base stage of the second triode;

Described voltage-boosting stage is made up of inductance, square-wave generator, power NMOS pipe, power diode, described inductance is connected between solar panel positive output level and power diode positive pole, described power diode negative pole connects the first resistance, the source electrode of described power NMOS pipe and drain electrode are connected to power diode positive pole and solar panel negative output level, grid is connected with the square wave output of square-wave generator, and the power end of described square-wave generator is connected with the positive output level of solar panel.

Preferably, between described the second transistor base and solar panel negative pole, be also connected with adjustable resistance.

Concrete, described the first triode and/or the second triode are 2SC2500 or 2SC1008.

Concrete, described square-wave generator is that HXO-NG series is a arbitrarily.

Field work charger described in the utility model, the sunlight that can directly use brightness constantly to change charges to mobile device, utilize the amplification principle of mutual inductance and triode solar cell output voltage and electric current to be carried out to the uninterrupted charging of cycle amplification, solve the field charging problem of mobile device, extend the operating time of mobile device, improved outwork efficiency.

Brief description of the drawings

Fig. 1 is a kind of embodiment schematic diagram of the utility model;

Mark and corresponding parts title in accompanying drawing: VIN-solar panel, BAT-rechargeable battery, C1-the first electric capacity, C2-the second electric capacity, C3-the 3rd electric capacity, R1-the first resistance, R2-the second resistance, R3-the 3rd resistance, R4-adjustable resistance, R5-the first feedback resistance, R6-the second feedback resistance, VT1-the first triode, VT2-the second triode D1-rectifier diode, D2-voltage stabilizing didoe, NP1-primary coil, NP2-feedback coil, NS-secondary coil, L-inductance, PN-power NMOS pipe, PD-power diode, PW-square-wave generator.

In figure, the upper end of each coil is starting point, and lower end is terminal.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is done to detailed description further, but execution mode of the present utility model is not limited to this.

Field work charger, comprise solar panel, first electric capacity in parallel with solar panel, also comprise the first triode, the second triode and transformer, the former limit of described transformer is made up of primary coil and feedback coil, described the first transistor base is connected with the second transistor collector, and be connected to solar panel positive output level by the first resistance, the first transistor collector is connected to solar panel positive output level by the second resistance, and the emitter of described the first triode, the second triode is all connected with solar panel negative output level;

Also comprise charge stage, described charge stage is made up of the feedback resistance string and the 3rd electric capacity that are connected in parallel on transformer secondary output coil, between described secondary coil starting point and feedback resistance string, be also connected with rectifier diode, the first diode cathode connects secondary coil starting point, the feedback point of described feedback resistance string connects the base stage of the second triode by voltage stabilizing didoe, the positive pole of described voltage stabilizing didoe connects the base stage of the second triode.

Solar panel VIN is that electric energy to first capacitor C 1 charge by electrooptical device by light energy conversion receiving solar energy, C1 voltage continues to rise, the effect of voltage-boosting stage is the output voltage of solar panel to utilize BOOST framework to rise with the constant ratio of boosting, utilize voltage-boosting stage of the present invention, at the output of power diode PD, under loss-free perfect condition, can obtain output voltage VO UT=VIN/(1-D), the output positive voltage that wherein VIN is solar panel, D is the duty cycle square wave that square-wave generator outputs to power NMOS pipe PN grid.Square-wave generator is preferably selected the HXO-NG series crystal oscillator of Hong Xing company, the operating voltage of above product is low, can in the voltage range of 1.2-1.8V, normally work, under cloudy weather, the output voltage of solar cell reaches 1.2V can drive square-wave generator work, bring to power diode output voltage, supplies with subsequent conditioning circuit and is suitable for.

When the output voltage of power diode is greater than the threshold voltage of the first triode VT1, after the first triode VT1 conducting, the collector current Ic flowing through in transformer NP1 increases at NP1 neutral line, make just lower negative induced voltage in feedback coil NP2 generation, make VT1 obtain base stage for just, launch very negative positive feedback voltage, this voltage injects base current through C2, R3 place Zhi Luxiang VT1 further increases the collector current of VT1, positive feedback produces avalanche process, makes VT1 saturation conduction.During VT1 saturation conduction, transformer stores magnetic energy by primary coil NP1.Meanwhile, induced voltage charges to C2, and along with increasing of C2 charging voltage, VT1 base potential step-down gradually, can not meet it and continue when saturated when the base current of VT1 changes, and VT1 exits saturation region and enters amplification region.VT1 enters after magnifying state, the maximum of its collector current before by magnifying state declines, negative lower positive induced voltage in feedback coil NP2 generation, VT1 base current is reduced, its collector current reduces thereupon,, there is avalanche process in positive feedback state reverse flip, VT1 ends rapidly again.After VT1 cut-off, the energy that transformer stores offers load from NP1, and the lower negative positive voltage that secondary coil NS produces, after rectifier diode VD1 rectifying and wave-filtering, obtains direct voltage to charging mobile phone battery on C3.In the time that VT1 ends, solar panel VIN to C2 reverse charging, improves VT1 base potential through R1, R3 place branch road gradually, makes its conducting again, the state that reaches capacity that again overturns, and circuit repeats the charging process of vibrating like this.In charge stage, R5, R6 composition feedback resistance string, VD2, VT2 etc. form pressure limiting circuit, and to protect battery not overcharged, for example, taking 3.6V battery of mobile phone as example, its charging restriction ceiling voltage is 4.2V.In the charging process of battery, cell voltage rises gradually, in the time that charging voltage is greater than 4.2V, after R5, R6 dividing potential drop, voltage stabilizing didoe D2 starts conducting, makes the second triode VT2 conducting, and the shunting action of VT2 has reduced the base current of VT1, thereby reduce the collector current Ic of VT1, reached the effect of restriction output voltage, at this moment circuit has stopped the large current charge to battery, the voltage of battery is maintained to 4.2V with little electric current.

A circuit parameters that is specifically applied to 3.6V charging device is R1=R2=10K, R3=470, R5=470, R6=2.2K, C1=C3=10u, C2=0.47u, when to 3.6V charging mobile phone battery, charging current is about 30-80 milliampere, relevant with sunlight strength, the Icm(maximum collector current of triode) should be greater than 0.5A, hEF(DC amplification factor) be 50-100, available 2SC2500,2SC1008 etc.

Preferably, between described the second transistor base and solar panel negative pole, be also connected with adjustable resistance R4.The effect of adjustable resistance R4 is to regulate feedback voltage control node, and in the circuit shown in Fig. 1, R4 is actual to connect with R5 with after R6 parallel connection again, and regulating R4 is adjustable feedback voltage control point, charging voltage can be adjusted, thereby adapt to different charging devices.

As mentioned above, can realize preferably the utility model.

Claims

1. field work charger, comprise solar panel, first electric capacity in parallel with solar panel, also comprise the first triode, the second triode and transformer, the former limit of described transformer is made up of primary coil and feedback coil, described the first transistor base is connected with the second transistor collector, and by the first resistance, voltage-boosting stage is connected to solar panel positive output level, the first transistor collector is connected to solar panel positive output level by the second resistance, described the first triode, the emitter of the second triode is all connected with solar panel negative output level,

2. field work charger according to claim 1, is characterized in that, between described the second transistor base and solar panel negative pole, is also connected with adjustable resistance.

3. field work charger according to claim 1, is characterized in that, described the first triode and/or the second triode are 2SC2500 or 2SC1008.

4. field work charger according to claim 1, is characterized in that, described square-wave generator is that HXO-NG series is a arbitrarily.