CN202841629U

CN202841629U - Solar energy boost LED driving power supply with protection function

Info

Publication number: CN202841629U
Application number: CN2012205053637U
Authority: CN
Inventors: 莫晓辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2013-03-27
Anticipated expiration: 2022-09-28

Abstract

The utility model provides a solar energy boost LED driving power supply with a protection function. The solar energy boost LED driving power supply with the protection function comprises a boost driving circuit, an output load connected with an output end of the boost driving circuit, and a dividing resistor used for setting a reference voltage, and also comprises a signal processing circuit, a trigger circuit and a first switch control device. The signal processing circuit is used for acquiring the voltage across two ends of the dividing resistor, comparing the voltage with the set reference voltage, and outputting control signals after the comparing. An input end of the trigger circuit is connected with an output end of the signal processing circuit to receive the control signals, and outputs control level signals to the first switch control device to control a circuit switch. The boost driving power supply with the protection function can protect the components of the circuit from being burned caused by short circuit or false input connecting, has a delay recovery function at the same time, and improves the reliability of the LED boost driving circuit.

Description

A kind of solar energy booster type LED driving power with defencive function

Technical field

The utility model relates to the LED drive control power supply, especially relates to a kind of solar energy booster type LED driving power with defencive function.

Background technology

LED has the characteristics such as high reliability, good efficiencies, fast response time, long service life, be widely used in the fields such as backlight, illumination, electronic equipment, and with LED during as display or other lighting apparatus or backlight, need to carry out constant current to it drives, avoid drive current to exceed maximum rating, affect its reliability.Drive circuit is the important component part of LED product, and the performance of drive circuit will directly have influence on the performances such as life-span, power consumption and reliability of LED product.

Along with the development of heliotechnics, a lot of electrical equipment begins to adopt solar cell to power now, to reach the purpose of energy-saving and environmental protection.But the output of existing solar cell mostly is low-voltage DC, therefore, when being applied on the electrical equipment such as LED lamp string, needing to increase and connects load after a DC voltage booster circuit promotes voltage again.A kind of typical LED as shown in Figure 2 drives the voltage increase and current constant circuit, formed by inductance, control chip and diode, adopt low-voltage dc power supply (such as storage battery, solar cell etc.) to power, voltage is used for driving the LED lamp string of load end after oversampling circuit promotes.1., owing to lack protective circuit but above-mentioned LED drives booster circuit and has following shortcoming:, when the output short circuit, input voltage directly is added in the output via inductance and diode, and this moment, control circuit can't be avoided the increase of output current, and electric current is crossed conference and burnt out components and parts in the circuit; 2., when input voltage moment rises to voltage greater than the LED string, will produce surge current among the LED, if surge current is enough large, can burn LED; 3., connect the inverse time circuit at input power and also lack protective effect.

The utility model content

In order to solve the problems of the technologies described above; the utility model provides a kind of solar energy booster type LED driving power with defencive function; this booster driving circuit provides perfect defencive function to improve the reliability of LED driving power, prevents the output loading short circuit and burns the components and parts of circuit.

To achieve these goals, the technical scheme that adopts of the utility model is:

A kind of solar energy booster type LED driving power with defencive function; comprise the booster driving circuit that is formed by inductance, diode, driving control chip and second switch control device; the output loading that is connected with described booster driving circuit output and be used for to set the divider resistance of reference voltage also comprises signal processing circuit, circuits for triggering and the first switch control device.Described signal processing circuit is used for gathering the divider resistance both end voltage and makes comparisons with the reference voltage of setting, and exports control signal after the comparison process; Described circuits for triggering input connects the output of signal processing circuit, is used for receiving the control signal of described signal processing circuit and exporting the control level signal to the first switch control device; Described the first switch control device is as the control switch of output loading end, and its control end connects the output of circuits for triggering, and according to the switch of the control level signal control circuit of circuits for triggering output.The protection module that is comprised of signal processing circuit, circuits for triggering and the first switch control device and described booster driving circuit consist of the driving power with defencive function, can effectively prevent the generation of short circuit, play a very good protection.

As improvement of the present utility model, be provided with the device of delay recovery control level signal in the described circuits for triggering, when being short-circuited in the loop, the short trouble rear circuits for triggering output that is eliminated recovers level signal and can be resumed work in the loop.

As improvement of the present utility model, the positive terminal of the external power source that described inductance arranges, be connected in series diode, described diode output connects output loading, the input of described second switch control device is connected between described inductance and the diode, its control end connects the drive output of described driving control chip, is used for control described inductance is discharged and recharged, by the diode output current.

As improvement of the present utility model, the output of described first switch control device of pressure feedback port feedback link of described driving control chip, the output of the described second controller spare of its current feedback terminal feedback link, wherein, described second switch control device is metal-oxide-semiconductor field effect transistor, its input impedance is high, and is low in energy consumption, is applicable to constant-current source and electronic switch.

As improvement of the present utility model, also comprise for the 3rd anti-reverse switch control device, be arranged on the negative pole end of described booster driving circuit, the external power source negative pole connects the input of described the 3rd switch control device, the control end of described the 3rd switch control device is connected with the positive pole of external power source, its output head grounding.And described the 3rd switch control device is metal-oxide-semiconductor field effect transistor, and it uses as electronic switch, can prevent that the external power source input from connecing the components and parts that cause on the contrary burning out in the circuit.

As further improvement of the utility model, described the first switch control device is metal-oxide-semiconductor field effect transistor.

The beneficial effects of the utility model: compared with prior art; booster type LED driving power of the present utility model has the function of protective circuit components and parts; the constant current offered load end that when driving power works, boosts by the output process; when load end is short-circuited; obtain signal and by more afterwards the result being input in the circuits for triggering by signal processing circuit; control the first switch control device by circuits for triggering and carry out power operation; the components and parts of protection booster driving circuit; be provided with simultaneously the delay recovery function in the circuits for triggering, guarantee that the first switch control device can frequent movement.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing and example.

Fig. 1 is the schematic diagram of the utility model circuit.

Fig. 2 is that existing a kind of typical LED drives booster circuit figure.

Implementation

With reference to Fig. 1; a kind of solar energy booster type LED driving power with defencive function of the present utility model; comprise booster driving circuit 1, the output loading 2 that is connected with booster driving circuit 1 output and be used for setting the divider resistance 7 of reference voltage; booster driving circuit 1 also comprises driving control chip 11, second switch control device 14; the inductance 12 that is connected with the positive terminal of external power source and the diode 13 that is connected in series with inductance 12; diode 13 has the unidirectional general character; be used for the output of control direct current, its output connects output loading 2.The drive output that drives control chip 11 connects the control end of second switch control device 14, drive the output of pressure feedback port feedback link first switch control device 3 of control chip 11, drive the output of the current feedback terminal feedback link second controller spare 14 of control chip 11, wherein, the input of second switch control device 14 is connected between described inductance 12 and the diode 13, drive control chip 11 by the FEEDBACK CONTROL second switch control devices 14 of feedback pin, the output of process electric current that inductance 12 is discharged and recharged.

Output at described booster driving circuit 1 is provided with the protection module that is comprised of signal processing circuit 4, circuits for triggering 5 and the first switch control device 3; the reference voltage that signal processing circuit 4 is used for collection divider resistance 7 both end voltage and setting is made comparisons, and exports control signal after the comparison process.Circuits for triggering 5 inputs connect the output of signal processing circuit 4; its output connects the control end of the first switch control device 3; be used for the output control signal of receive signal processing circuit 4 and export control level signal controlling the first switch control device 3 closures, the cut-off loop electric current reaches the effect of protective circuit.Further, 5 li devices that are provided with delay recovery control level signal of circuits for triggering, time-delay output recovers the control level signal after receiving the troubleshooting signal, make 3 conductings of the first switch control device, circuit is resumed work, thereby prevents fault behind the short circuit to be eliminated and the situation that causes the loop not resume work occurs.

Concrete, the first switch control device 3 and second switch control device 14 all are metal-oxide-semiconductor field effect transistor, its input impedance is high, low in energy consumption, be applicable to constant-current source and electronic switch, wherein second switch control device 14 forms constant-current source output power supply by driving the FEEDBACK CONTROL of control chip 11 with inductance 12 and diode 13.

Concrete, comprise also that for the 3rd anti-reverse switch control device 6 be arranged on the negative pole end of booster driving circuit 1, the external power source negative pole connects the input of the 3rd switch control device 6, the control end of the 3rd switch control device 6 is connected with the positive pole of external power source, its output head grounding.And the 3rd switch control device 6 be metal-oxide-semiconductor field effect transistor; when external power source input polarity is correct; the grid of metal-oxide-semiconductor field effect transistor can obtain forward voltage and conducting by resistance; the circuit normal operation; during the input reverse polarity connection, what the grid of metal-oxide-semiconductor field effect transistor obtained is reverse voltage, the input current cut-off; can prevent that the external power source input from connecing the components and parts that cause on the contrary burning out in the circuit, thereby protect whole circuit.

Booster driving circuit 1 control direct current output, the drive end output signal of the driving control chip 11 that it is built-in makes second switch control device 14 closures, this moment, inductance 12 was in charged state, after charging is complete, the electric current that the current feedback terminal of driving control chip 11 detects reaches threshold values, this moment, the drive end output signal disconnected second switch control device 14, inductance 12 is in discharge condition, FEEDBACK CONTROL second switch control device 14 by the feedback pin, to discharging and recharging of inductance 12, obtain constant output current.When output short-circuit or input overvoltage occurring; the capital increases the electric current of LED string; thereby draw increasing of output voltage; when this voltage during greater than 2 times of normal voltage; after signal processing circuit 4 amplifications, comparison process, the output control signal disconnects the first switch control device 3 and stops booster driving circuit 1 through circuits for triggering 5 output level control signals again and works; thereby cut off whole loop current, play the effect of output overcurrent, short-circuit protection.After entering guard mode; the time delay module of circuits for triggering 5 can be exported the restoring signal start-up system again after 2 seconds, if this moment, fault still existed, circuit enters guard mode again; this process is constantly repeatedly until fault clearance, and normal operation just can recover in system.The delay recovery effect of circuits for triggering 5 avoids switch control device in the circuit because of frequent connection and the shutoff heating burnout of switching.

The above is preferred embodiment of the present utility model, and the utility model is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection range of the present utility model.

Claims

1. solar energy booster type LED driving power with defencive function; comprise the booster driving circuit (1) that is formed by inductance (12), diode (13), driving control chip (11) and second switch control device (14); the output loading (2) that is connected with described booster driving circuit (1) output and be used for to set the divider resistance (7) of reference voltage; it is characterized in that: also comprise

Signal processing circuit (4) for gathering described divider resistance (7) both end voltage and making comparisons with the reference voltage of setting, is exported control signal after the comparison process;

Circuits for triggering (5), its input connects the output of signal processing circuit (4), is used for receiving the control signal of described signal processing circuit (4) and exporting the control level signal;

The first switch control device (3), described the first switch control device (3) is as the control switch of output loading (2) end, and its control end connects the output of described circuits for triggering (5) and the control level signal control circuit switch of exporting according to circuits for triggering (5).

2. described a kind of solar energy booster type LED driving power with defencive function according to claim 1 is characterized in that: the inner device that is provided with delay recovery control level signal of described circuits for triggering (5).

3. a kind of solar energy booster type LED driving power with defencive function according to claim 1; it is characterized in that: the positive terminal of the external power source that described inductance (12) arranges; be connected in series described diode (13); described diode (13) output connects output loading (2); the input of described second switch control device (14) is connected between described inductance (12) and the diode (13); its control end connects the drive output of described driving control chip (11); be used for control described inductance (12) is discharged and recharged, by diode (13) output constant current.

4. a kind of solar energy booster type LED driving power with defencive function according to claim 3, it is characterized in that: described second switch control device (14) is metal-oxide-semiconductor field effect transistor.

5. a kind of solar energy booster type LED driving power with defencive function according to claim 1; it is characterized in that: the output of described the first switch control device of the pressure feedback port feedback link of described driving control chip (11) (3), the output of the described second controller spare of its current feedback terminal feedback link (14).

6. a kind of solar energy booster type LED driving power with defencive function according to claim 1; it is characterized in that: the negative pole end of external power source is connected with for anti-reverse the 3rd switch control device (6); the control end of described the 3rd switch control device (6) is connected with the positive terminal of external power source, its output head grounding.

7. a kind of solar energy booster type LED driving power with defencive function according to claim 6, it is characterized in that: described the 3rd switch control device (6) is metal-oxide-semiconductor field effect transistor.

8. a kind of solar energy booster type LED driving power with defencive function according to claim 1, it is characterized in that: described the first switch control device (3) is metal-oxide-semiconductor field effect transistor.