CN104768258A - Constant current driven LED over-voltage and over-current protection circuit - Google Patents
Constant current driven LED over-voltage and over-current protection circuit Download PDFInfo
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Abstract
A constant current driven LED over-voltage and over-current protection circuit is used for protecting a series LED lamp group when over-voltage or over-current occurs. The constant current driven LED over-voltage and over-current protection circuit comprises a trigger module, a constant current driving module, an over-voltage protection module, and a sampling module. The trigger module triggers the constant current driving module to drive a series LED lamp group to be turned on. The sampling module is used for sampling the current of the series LED lamp group and feeding the current back to the constant current driving module. When the feedback current is higher than the rated current value, the constant current driving module controls the current output to the series LED lamp group to be decreased so as to avoid over-current of the series LED lamp group. The over-voltage protection module is used for sharing the voltage of the series LED lamp group to avoid over-voltage of the series LED lamp group when the output current of the constant current driving module is too high and over-voltage of the series LED lamp group is caused. Therefore, the series LED lamp group can be protected when the circuit is over-current or over-voltage.
Description
Technical field
The present invention relates to overcurrent-overvoltage protecting circuit, particularly relate to a kind of constant-current driving LED overcurrent-overvoltage protecting circuit simple to operation.
Background technology
In modern electronic technology circuit, due to the output of electronic device or input request signal higher, therefore, for the input signal of electronic device or the area requirement of output signal comparatively strict.Such as, voltage signal too high, easily causes electronic device burn or affect useful life.And in reality, when LED drive power is unstable, make the voltage signal exported may be too high, easily damage is caused to the LED in subsequent conditioning circuit.Or LED constant current source drives in the process of work, and when output loading is excessive, when device inside element or external circuit generation partial short-circuit, overcurrent appears in load LED, easily causes damage to LED.
Summary of the invention
Based on this, be necessary to provide a kind of constant-current driving LED overcurrent-overvoltage protecting circuit simple to operation.
A kind of constant-current driving LED overcurrent-overvoltage protecting circuit, for protecting series LED lamp group when there is over-voltage and over-current, comprises trigger module, constant-current driven module, overvoltage protective module and sampling module;
The input termination input power of described trigger module, export the Enable Pin of constant-current driven module described in termination; The negative pole of series LED lamp group described in the input termination input power of described constant-current driven module, the positive pole exporting termination series LED lamp group, feedback termination, earth terminal ground connection; The output of constant current protection module described in the input termination of described overvoltage protective module, export the feedback end of constant current protection module described in termination; The feedback end of constant current protection module described in the output termination of described sampling module, earth terminal ground connection;
When described trigger module sends triggering signal to the Enable Pin of described constant-current driven module, described constant-current driven module output current, described series LED lamp group receives described constant-current driven module output current and lights; Described sampling module is for the electric current of described series LED lamp group of sampling, and the current feedback of sampling is given the feedback end of described constant-current driven module, when the feedback current that described constant-current driven module receives exceedes load current value, the electric current that described constant-current driven module controls described series LED lamp group is reduced to rated current; Described overvoltage protective module be used for described constant-current driven module output current is too high make the pressure drop of described series LED lamp group too high time, point get voltage in described series LED lamp group.
Wherein in an embodiment, described trigger module comprises trigger switch K1, and the two ends of described trigger switch K1 correspond to input and the output of described trigger module.
Wherein in an embodiment, described constant-current driven module comprises inductance L 1, electric capacity C3, electric capacity C4, resistance R3 and chip TPS61086;
Described inductance L 1 one termination input power, first switch terminals of chip TPS61086 described in another termination and second switch end; The SS end of chip TPS61086 described in described electric capacity C3 mono-termination, other end ground connection; Described electric capacity C4 and resistance R3 is series between the COMP end of described chip TPS61086 and ground connection; The input termination input power of described chip TPS61086, the points of common connection of the Enable Pin of described chip TPS61086, the first switch terminals and second switch end, feedback end correspond to the Enable Pin of described constant-current driven module, output and feedback end.
Wherein in an embodiment, described overvoltage protective module comprises voltage-stabiliser tube ZD1 and resistance R4;
Described voltage-stabiliser tube ZD1 and described resistance R4 connects, and wherein, the negative pole of described voltage-stabiliser tube ZD1 is the input of described overvoltage protective module, and described resistance R4 is the output of described overvoltage protective module away from one end of described voltage-stabiliser tube ZD1.
Wherein in an embodiment, described sampling module comprises sampling resistor R2, described sampling resistor R2 one end ground connection, the feedback end of constant-current driven module described in another termination.
Wherein in an embodiment, also comprise electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
Wherein in an embodiment, also comprise electric capacity C2, described electric capacity C2 mono-termination input power, other end ground connection.
Wherein in an embodiment, also comprise diode D1, the positive pole of described diode D1 connects the output of described constant-current driven module, the positive pole of series LED lamp group described in negative pole.
Wherein in an embodiment, also comprise electric capacity C5, described electric capacity C5 is in parallel with described series LED lamp group.
Above-mentioned constant-current driving LED overcurrent-overvoltage protecting circuit triggers constant-current driven module by trigger module and drives series LED lamp group to light, and sampling module for the electric current of series LED lamp group of sampling, and feeds back to constant-current driven module.When feedback current is higher than load current value, the electric current that constant-current driven module controls to export to series LED lamp group reduces, and avoids series LED lamp group to occur overcurrent.Overvoltage protective module be used for constant-current driven module output current too high and cause the group overvoltage of series LED lamp time, with series LED lamp component pressure, avoid series LED lamp group to occur overvoltage.Therefore, it is possible to protect series LED lamp group when circuit overcurrent-overvoltage.
Accompanying drawing explanation
Fig. 1 is the module map of constant-current driving LED overcurrent-overvoltage protecting circuit;
Fig. 2 is the schematic diagram of constant-current driving LED overcurrent-overvoltage protecting circuit.
Embodiment
As shown in Figure 1, be the module map of constant-current driving LED overcurrent-overvoltage protecting circuit.
A kind of constant-current driving LED overcurrent-overvoltage protecting circuit, for protecting series LED lamp group when there is over-voltage and over-current, comprises trigger module 101, constant-current driven module 102, overvoltage protective module 103 and sampling module 104.
The input termination input power of described trigger module 101, export the Enable Pin of constant-current driven module 102 described in termination; The negative pole of series LED lamp group described in the input termination input power of described constant-current driven module 102, the positive pole exporting termination series LED lamp group, feedback termination, earth terminal ground connection; The output of constant current protection module 102 described in the input termination of described overvoltage protective module 103, export the feedback end of constant current protection module 102 described in termination; The feedback end of constant current protection module 102 described in the output termination of described sampling module 104, earth terminal ground connection.
When described trigger module 101 sends triggering signal to the Enable Pin of described constant-current driven module 102, described constant-current driven module 102 output current, described series LED lamp group receives described constant-current driven module 102 output current and lights; Described sampling module 104 is for the electric current of described series LED lamp group of sampling, and the current feedback of sampling is given the feedback end of described constant-current driven module 102, when the feedback current that described constant-current driven module 102 receives exceedes load current value, the electric current that described constant-current driven module 102 controls described series LED lamp group is reduced to rated current; Described overvoltage protective module 103 for described constant-current driven module 102 output current is too high make the pressure drop of described series LED lamp group too high time, point get voltage in described series LED lamp group.
Trigger module 101 is for providing triggering signal for constant-current driven module 102, and when trigger module 101 exports triggering signal, constant-current driven module 102 starts the electric current controlling series LED lamp group.When trigger module 101 does not send triggering signal, constant-current driven module 102 can not control the electric current of series LED lamp group.
Constant-current driven module 102 is for controlling the size of current of series LED lamp group.Concrete, when the feedback current of reception sampling module 104 is higher or lower than load current value, constant-current driven module 102 correspondingly can adjust output current, makes the electric current of series LED lamp group at load current value.
Overvoltage protective module 103, for when overvoltage appears in circuit, divides the pressure drop of getting series LED lamp group, avoids the pressure drop of series LED lamp group too high and damage LED.
Sampling module 104 for the electric current of series LED lamp group of sampling, and feeds back to constant-current driven module 102, thus; when the electric current that sampling module 104 is sampled is too high; constant-current driven module 102 can be made to reduce output current, thus protection series LED lamp group, avoid occurring overcurrent.In like manner, when the electric current sampled is too small, constant-current driven module 102 can increase output current, and series LED lamp group is normally worked.
As shown in Figure 2, be the schematic diagram of constant-current driving LED overcurrent-overvoltage protecting circuit.
Trigger module 101 comprises trigger switch K1, and the two ends of described trigger switch K1 correspond to input and the output of described trigger module.
Constant-current driven module 102 comprises inductance L 1, electric capacity C3, electric capacity C4, resistance R3 and chip TPS61086.
Described inductance L 1 one termination input power, first switch terminals of chip TPS61086 described in another termination and second switch end; The SS end of chip TPS61086 described in described electric capacity C3 mono-termination, other end ground connection; Described electric capacity C4 and resistance R3 is series between the COMP end of described chip TPS61086 and ground connection; The input termination input power of described chip TPS61086, the points of common connection of the Enable Pin of described chip TPS61086, the first switch terminals and second switch end, feedback end correspond to the Enable Pin of described constant-current driven module 102, output and feedback end.
Described overvoltage protective module 103 comprises voltage-stabiliser tube ZD1 and resistance R4.
Described voltage-stabiliser tube ZD1 and described resistance R4 connects, and wherein, the negative pole of described voltage-stabiliser tube ZD1 is the input of described overvoltage protective module 103, and described resistance R4 is the output of described overvoltage protective module 103 away from one end of described voltage-stabiliser tube ZD1.
Described sampling module 104 comprises sampling resistor R2, described sampling resistor R2 one end ground connection, the feedback end of constant-current driven module 102 described in another termination.
Constant-current driving LED overcurrent-overvoltage protecting circuit also comprises electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
Constant-current driving LED overcurrent-overvoltage protecting circuit also comprises electric capacity C2, described electric capacity C2 mono-termination input power, other end ground connection.
Constant-current driving LED overcurrent-overvoltage protecting circuit also comprises diode D1, and the positive pole of described diode D1 connects the output of described constant-current driven module, the positive pole of series LED lamp group described in negative pole.
Constant-current driving LED overcurrent-overvoltage protecting circuit also comprises electric capacity C5, and described electric capacity C5 is in parallel with described series LED lamp group.
Based on above-mentioned all embodiments, the operation principle of constant-current driving LED overcurrent-overvoltage protecting circuit is as follows:
Input power 2.3V-2.6V, through electric capacity C1 and electric capacity C2 filtering, exports to chip TPS61086 and trigger switch K1.
The switching tube open period of chip TPS61086.Switch terminals and the ground connection of input power, inductance L 1 and chip TPS61086 form conducting loop.Inductance L 1 starts energy storage.Series LED lamp group is powered by electric capacity C5 and is lighted.When the switching tube of chip TPS61086 is closed, due to the effect of back-emf, the electric energy that inductance L 1 stores is powered to electric capacity C5 and series LED lamp group via diode D1.Due to the storage of diode D1, the electric charge of electric capacity C5 can not reflux to the switch terminals of inductance L 1 or chip TPS61086.
Closed trigger switch K1, the Enable Pin to chip TPS61086 exports high level.I.e. opening chip TPS61086.Chip TPS61086 starts working after receiving input voltage.The switch terminals of chip TPS61086 is to series LED lamp group output current.The SS pin of chip TPS61086 is soft start pin.At the indirect electric capacity C3 of SS pin and ground connection, for preventing the interference of surge current.Electric capacity C3 is set to 100uF usually.When chip TPS61086 works, namely during chip TPS61086 Enable Pin input high level, electric capacity C3 is charged to 0.3V at once.Then the current charges with 10uA is continued.Until output voltage reaches 90% of rated value.When chip TPS61086 quits work, electric capacity C3 discharges over the ground.The capacitance of electric capacity C3 is larger, and Anti-surging ability is stronger, but the start-up time of circuit is longer,
The comp pin of chip TPS61086 is compensation pin, contact resistance R3 and electric capacity C4, for improving load transient response ability.The FB pin of chip TPS61086 is Voltage Feedback pin.For the voltage of the sample rate current and overvoltage protective module 103 that receive sampling resistor R2.For the output current size of control chip TPS61086.Therefore, when the electric current that sampling resistor R2 samples exceedes setting threshold, chip TPS61086 can control output current according to feedback current and reduce, and avoids occurring overcurrent.
Voltage-stabiliser tube ZD1 adopts 15V, and when causing overvoltage for breaking down at chip TPS61086 and series LED lamp group place circuit, protecting series LED lamp group, is normally series LED lamp component pressure, avoids the pressure drop of series LED lamp group too high.Resistance R4 is used for being carried out current limliting at voltage-stabiliser tube ZD1 by during high pressure reverse breakdown.
Above-mentioned constant-current driving LED overcurrent-overvoltage protecting circuit triggers constant-current driven module 102 by trigger module 101 and drives series LED lamp group to light, and sampling module 104 for the electric current of series LED lamp group of sampling, and feeds back to constant-current driven module 102.When feedback current is higher than load current value, the electric current that constant-current driven module 102 controls to export to series LED lamp group reduces, and avoids series LED lamp group to occur overcurrent.Overvoltage protective module 103 is for too high and when causing the group overvoltage of series LED lamp, with series LED lamp component pressure, avoid series LED lamp group to occur overvoltage at constant-current driven module 102 output current.Therefore, it is possible to protect series LED lamp group when circuit overcurrent-overvoltage.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a constant-current driving LED overcurrent-overvoltage protecting circuit, for protecting series LED lamp group when there is over-voltage and over-current, is characterized in that, comprise trigger module, constant-current driven module, overvoltage protective module and sampling module;
The input termination input power of described trigger module, export the Enable Pin of constant-current driven module described in termination; The negative pole of series LED lamp group described in the input termination input power of described constant-current driven module, the positive pole exporting termination series LED lamp group, feedback termination, earth terminal ground connection; The output of constant current protection module described in the input termination of described overvoltage protective module, export the feedback end of constant current protection module described in termination; The feedback end of constant current protection module described in the output termination of described sampling module, earth terminal ground connection;
When described trigger module sends triggering signal to the Enable Pin of described constant-current driven module, described constant-current driven module output current, described series LED lamp group receives described constant-current driven module output current and lights; Described sampling module is for the electric current of described series LED lamp group of sampling, and the current feedback of sampling is given the feedback end of described constant-current driven module, when the feedback current that described constant-current driven module receives exceedes load current value, the electric current that described constant-current driven module controls described series LED lamp group is reduced to rated current; Described overvoltage protective module be used for described constant-current driven module output current is too high make the pressure drop of described series LED lamp group too high time, point get voltage in described series LED lamp group.
2. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, described trigger module comprises trigger switch K1, and the two ends of described trigger switch K1 correspond to input and the output of described trigger module.
3. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, described constant-current driven module comprises inductance L 1, electric capacity C3, electric capacity C4, resistance R3 and chip TPS61086;
Described inductance L 1 one termination input power, first switch terminals of chip TPS61086 described in another termination and second switch end; The SS end of chip TPS61086 described in described electric capacity C3 mono-termination, other end ground connection; Described electric capacity C4 and resistance R3 is series between the COMP end of described chip TPS61086 and ground connection; The input termination input power of described chip TPS61086, the points of common connection of the Enable Pin of described chip TPS61086, the first switch terminals and second switch end, feedback end correspond to the Enable Pin of described constant-current driven module, output and feedback end.
4. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, described overvoltage protective module comprises voltage-stabiliser tube ZD1 and resistance R4;
Described voltage-stabiliser tube ZD1 and described resistance R4 connects, and wherein, the negative pole of described voltage-stabiliser tube ZD1 is the input of described overvoltage protective module, and described resistance R4 is the output of described overvoltage protective module away from one end of described voltage-stabiliser tube ZD1.
5. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, described sampling module comprises sampling resistor R2, described sampling resistor R2 one end ground connection, the feedback end of constant-current driven module described in another termination.
6. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, also comprises electric capacity C1, described electric capacity C1 mono-termination input power, other end ground connection.
7. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, also comprises electric capacity C2, described electric capacity C2 mono-termination input power, other end ground connection.
8. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, also comprises diode D1, and the positive pole of described diode D1 connects the output of described constant-current driven module, the positive pole of series LED lamp group described in negative pole.
9. constant-current driving LED overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that, also comprises electric capacity C5, and described electric capacity C5 is in parallel with described series LED lamp group.
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| CN106413201A (en) * | 2016-11-23 | 2017-02-15 | 赛尔富电子有限公司 | Constant-current power supply with various current outputs for LED lamps |
| CN106445059A (en) * | 2016-09-05 | 2017-02-22 | 深圳市炜烨丰电子科技有限公司 | Hard disk protection circuit for voltage leap of alternating-current power network |
| CN108040399A (en) * | 2018-01-03 | 2018-05-15 | 欧普照明股份有限公司 | A kind of overvoltage crowbar and constant current driver circuit for LED |
| CN108541101A (en) * | 2018-04-10 | 2018-09-14 | 厦门元顺微电子技术有限公司 | The circuit structure of chip |
| CN113966034A (en) * | 2021-11-02 | 2022-01-21 | 上海南麟电子股份有限公司 | LED system |
| CN114189962A (en) * | 2021-12-17 | 2022-03-15 | 深圳民爆光电股份有限公司 | High-precision LED constant-current driving circuit and driving power supply thereof |
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| CN113966034B (en) * | 2021-11-02 | 2023-10-03 | 上海南麟电子股份有限公司 | LED system |
| CN114189962A (en) * | 2021-12-17 | 2022-03-15 | 深圳民爆光电股份有限公司 | High-precision LED constant-current driving circuit and driving power supply thereof |
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