CN105870896B - A kind of output short circuit protection circuit, load driving system and method - Google Patents
A kind of output short circuit protection circuit, load driving system and method Download PDFInfo
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- CN105870896B CN105870896B CN201610343053.2A CN201610343053A CN105870896B CN 105870896 B CN105870896 B CN 105870896B CN 201610343053 A CN201610343053 A CN 201610343053A CN 105870896 B CN105870896 B CN 105870896B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The present invention provides a kind of output short circuit protection circuit, load driving system and method; load driving system includes drive module and load; wherein; drive module is constant current linear regulator; output short circuit protection circuit includes: pincers die block; it is connected respectively with drive module and load; for when output short-circuit occurs for load driving system, by load relative to the input terminal of input voltage source pressure difference pincers to less than predetermined voltage threshold to divide the first sub- input voltage of the load driving system of the constant current linear regulator；Division module, it is connected respectively with drive module and load, for carrying out Current limited Control to the output electric current of the load driving system of constant current linear regulator with the divide the load driving system of constant current linear regulator second sub- input voltage when output short-circuit occurs for load driving system.Load is carried out short circuit occurs during constant current driving if the present invention realizes, the electronic device inside constant current linear regulator can be in a safe working area.
Description
Technical field
The invention belongs to LED to drive applied technical field, be related to a kind of circuit and drive system and method, more particularly to
A kind of output short circuit protection circuit, load driving system and method.
Background technique
In existing LED driving application, constant current drive is often carried out to LED light string using constant current linear regulator chip
It is dynamic.And due to the limitation of chip manufacture technique, the pressure voltage for being internally integrated power tube of linear regulator is limited.In the prior art
Constant current linear regulator chip can be used, input/output terminal connects a big electrolytic capacitor.For example, total input voltage is 80V, when defeated
It is permanent when LED light string relative to the pressure difference average value of voltage input end is 80V-75V=5V when the voltage of LED load is 75V out
Cleanliness adjuster chip can trouble free service.
But in some special circumstances, for example, in LED drive power production test procedure, when input voltage power down
Afterwards, the voltage of 80V is stored on big electrolytic capacitor, at this time because reason for manual operation causes LEDP shorted to earth, LEDP relative to
The pressure difference of voltage input end is directly storage voltage 80V on big electrolytic capacitor, can be punctured in constant current linear regulator chip at this time
Electronic device simultaneously burns out the electronic device.
Therefore, a kind of output short circuit protection circuit, load driving system and method how are provided, to solve in the prior art
The LED light shorted to earth concatenated is caused due to there are special circumstances, when a short circuit occurs, LED light string is relative to voltage input
The pressure difference at end is directly that input voltage punctures and burn many disadvantages such as the electronic device inside the constant current linear regulator, real
Have become practitioner in the art's technical problem urgently to be resolved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of output short circuit protection circuit,
Load driving system and method cause to concatenate since special circumstances occurs in constant current linear regulator in the prior art for solving
LED light shorted to earth, when a short circuit occurs, LED light string relative to the pressure difference of voltage input end be directly input voltage breakdown
And the problem of burning the electronic device inside the constant current linear regulator.
In order to achieve the above objects and other related objects, one aspect of the present invention provides a kind of output short circuit protection circuit, answers
For the load driving system including drive module and load, wherein the drive module is constant current linear regulator, described defeated
Short-circuit protection circuit includes: pincers die block out, is connected respectively with the drive module and load, is for driving in the load
When output short-circuit occurs for system, the pressure difference pincers to less than predetermined voltage threshold of the input terminal by the load relative to input voltage source
To divide the first sub- input voltage of the load driving system of the constant current linear regulator；Division module, respectively with the drive
Dynamic model block and load connection, are used for when output short-circuit occurs for the load driving system, to the constant current linear regulator
The output electric current of load driving system carries out Current limited Control to divide the of the load driving system of the constant current linear regulator
Two sub- input voltages.
In one embodiment of the invention, the division module includes onunit, point connecting with the onunit
Press unit, and the current limiting unit connecting respectively with the partial pressure unit and onunit；Wherein, the onunit is used for as institute
It states partial pressure unit and conducting voltage is provided；The partial pressure unit is used for when output short-circuit occurs, linear for dividing the constant current
Second input voltage of the load driving system of adjuster；The current limiting unit is used for when output short-circuit occurs, by output electricity
Ductility limit system is within a predetermined range.
In one embodiment of the invention, the onunit includes first resistor, and the Zener connecting with first resistor
Diode；Wherein, the first resistor provides bias current for the Zener diode to provide conducting for the partial pressure unit
Voltage；The cathode of the Zener diode is connected with one end of the first resistor, the plus earth of the Zener diode.
In one embodiment of the invention, the partial pressure unit is greater than the defeated of the input voltage source using its operating voltage
Enter the resistance to voltage device of voltage.
In one embodiment of the invention, the partial pressure unit is a N-channel field-effect tube；Wherein, the N-channel enhancing
The grid of type field-effect tube is connected with the cathode of the Zener diode, the drain electrode of the N-channel enhancement mode FET with
The load is connected, and the source electrode of the N-channel enhancement mode FET is connect with the current limiting unit.
In one embodiment of the invention, the current limiting unit includes triode, second resistance and 3rd resistor；Wherein,
The collector of the triode is connected with the cathode of the Zener diode, the base stage of the triode and the second resistance
One end be connected, the emitter of triode ground connection, one end of the other end of the second resistance and the 3rd resistor
It is connected, the other end ground connection of the 3rd resistor.
In one embodiment of the invention, the pincers die block is also used to when the load driving system works normally,
Shunt the continuous current of a part of load driving system.
Another aspect of the present invention provides a kind of load driving system, and the load driving system includes: drive module, and negative
Connection is carried, for carrying out constant current driving to the load；The drive module is constant current linear regulator；The output short-circuit
Circuit is protected, connect with the load and drive module, is used in load driving system generation output short-circuit, to flowing through
Output electric current in the drive module and load is controlled to protect the load driving system.
It include a high-voltage MOS pipe in the constant current linear regulator in one embodiment of the invention；The predeterminated voltage
Threshold value is the breakdown voltage of the high-voltage MOS pipe.
In one embodiment of the invention, one end of the pincers die block is connected with the drain electrode of the high-voltage MOS pipe, institute
The other end for stating pincers die block is connected with the source electrode of the high-voltage MOS pipe.
Another aspect of the invention provides a kind of load driving method, is applied to load driving system, load driving system
System include constant current linear regulator, the load driving method including the following steps: to the constant current linear regulator
The load of connection carries out constant current driving；When output short-circuit occurs for the load driving system, by the load relative to input
The pressure difference pincers to less than predetermined voltage threshold of the input terminal of voltage source drive system with the load for dividing the constant current linear regulator
First sub- input voltage of system；Meanwhile when output short-circuit occurs for the load driving system, to the load driving system
It exports electric current and carries out Current limited Control with the divide the load driving system second sub- input voltage；The first sub- input voltage
Input voltage with the sum of sub second input voltage equal to be set forth in input voltage source.
As described above, output short circuit protection circuit of the invention, load driving system and method, have below beneficial to effect
Fruit:
Output short circuit protection circuit, load driving system and method for the present invention, which are realized, is carrying out constant current to load
If short circuit occurs during driving, the electronic device inside constant current linear regulator can be in a safe working area, and
The thermal losses to constant current linear regulator inside chip is reduced in normal work.
Detailed description of the invention
Fig. 1 is shown as the theory structure schematic diagram of load driving system of the invention in an embodiment.
Fig. 2 is shown as the electrical block diagram of load driving system of the invention in an embodiment.
Fig. 3 is shown as the flow diagram of load driving method of the invention in an embodiment.
Component label instructions
1 load driving system
10 input voltage sources
11 loads
12 drive modules
13 pincers die blocks
14 division modules
15 energy-storage modules
2 output short circuit protection circuits
S1~S3 step
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Embodiment
The present embodiment provides a kind of load driving system, the load driving system includes:
Drive module is connected with load, for carrying out constant current driving to the load；The drive module is that constant current is linear
Adjuster；
Output short circuit protection circuit is connect with the load and drive module, for occurring in the load driving system
When output short-circuit, the output electric current flowed through in the drive module and load is controlled to protect load driving system
System；The output short circuit protection circuit includes:
Die block is clamped, is connected respectively with the drive module and load, for being exported in the load driving system
When short-circuit, the pressure difference pincers to less than predetermined voltage threshold of the input terminal by the load relative to input voltage source are described to divide
The sub- input voltage of the first of the load driving system of constant current linear regulator；
Division module connects respectively with the drive module and load, for exporting in the load driving system
When short-circuit, Current limited Control is carried out to divide the constant current to the output electric current of the load driving system of the constant current linear regulator
The sub- input voltage of the second of the load driving system of linear regulator；
The sum of the first sub- input voltage and the described second sub- input voltage is electric equal to the input of the input voltage source
Pressure.
It is described in detail below with reference to diagram load driving system described in the present embodiment.Referring to Fig. 1, display
For theory structure schematic diagram of the load driving system in an embodiment.As shown in Figure 1, the load driving system 1 includes defeated
Enter voltage source 10, load 11, drive module 12, output short circuit protection circuit 2 and energy-storage module 15.The output short circuit protection
Circuit 2 includes pincers die block 13 and division module 14.
The load 11 includes lighting module, resistance or motor etc..The load 11 is illumination mould in this present embodiment
Block, i.e., the LED light of multiple concatenations.
The drive module 12 connecting with the lighting module 11 is used to carry out constant current driving to the lighting module 11.At this
In embodiment, the drive module 12 uses the constant current linear regulator of 1um 40V BiCMOS technique design.The constant-current contour
Property adjuster in practical application include a high-voltage MOS pipe and an error amplifier, in the present embodiment, the high-voltage MOS pipe
For high voltage PMOS pipe.The drain D and current source loads of the high voltage PMOS pipe, i.e. LED light string in the present embodiment are connected, institute
The source S for stating high voltage PMOS pipe is connected to the input terminal of input voltage source through a detection resistance, the grid of the high-voltage MOS pipe with
The output end of the error amplifier is connected, the error amplifier, and one input end reception flows through the current source loads
The detection signal of electric current, another input terminal receive reference voltage signal.
The output short circuit protection circuit 2 connecting with the load 11 and drive module 12 is used in the load driving system
When output short-circuit occurs, the output electric current flowed through in the drive module and load is controlled to protect the load to drive
System；The output short circuit protection circuit includes:
The pincers die block 13 connecting respectively with the lighting module 11 and drive module 12 is used to drive in the load
Pressure difference pincers to less than predeterminated voltage when output short-circuit occurs for system, by the lighting module relative to the input terminal of input voltage source
Threshold value is to divide the first sub- input voltage of the load driving system of the constant current linear regulator.In the present embodiment, described
Predetermined voltage threshold is the drive module 12, i.e., the breakdown voltage of the described constant current linear regulator mesohigh PMOS tube.Output
When short-circuit, the electric current for flowing through pincers die block 13 is greater than the setting electric current of drive module 12, the amplification of 12 internal error of drive module
Device can automatically shut down the high voltage PMOS pipe in the constant current linear regulator.The pincers die block 13 is also used to drive in the load
When dynamic system worked well, a part of continuous current is shunted to play the role of the auxiliary high voltage PMOS pipe heat dissipation, to subtract
The low thermal losses to chip.
The division module 14 connecting respectively with the lighting module 11 and drive module 12 is used to drive in the load
When output short-circuit occurs for system, Current limited Control is carried out to divide to the output electric current of the load driving system of the constant current linear regulator
The second sub- input voltage of the load driving system of the constant current linear regulator is pressed, that is, shares the residue of input voltage source
The sum of voltage, i.e., the described first sub- input voltage and the described second sub- input voltage is electric equal to the input of the input voltage source
Pressure.With continued reference to Fig. 1, the division module 14 specifically includes onunit 141, partial pressure unit 142 and current limiting unit 143.Its
In, the onunit 141 is used to provide conducting voltage for the partial pressure unit 142.
The partial pressure unit 142 connecting with the onunit 141 is used for when output short-circuit occurs, for dividing
State the second input voltage of the load driving system of constant current linear regulator.
It is used for respectively with the onunit 141 and partial pressure unit 142 and the current limiting unit 143 connecting short in generation output
Lu Shi, within a predetermined range by output current limit.
Energy-storage module 14 is connect with the input voltage source 10, drive module 12 and division module 14 respectively, the energy storage
Module 14 is used to store the electric energy on input voltage source 16 when output short-circuit occurs for the load driving system.In this implementation
In example, the energy-storage module 14 is a big electrolytic capacitor C1 (220uF/100V), realizes low ripple input voltage.
It describes in detail below by way of particular circuit configurations load driving system described in the present embodiment.Please refer to figure
2, it is shown as circuit diagram of the load driving system in an embodiment.As shown in Fig. 2, the load driving system 1 includes
Input voltage source 10, lighting module 11, drive module 12, pincers die block 13, pincers die block 14 and energy-storage module 15.
Wherein, the input voltage source 10 is external switch power supply.The lighting module 11 is the LED light of multiple concatenations.
The drive module 12 includes error amplifier Oamp, 40VPMOS pipe MP1 and detection resistance R4.The PMOS tube MP1's hits
Wearing voltage is usually 48V.The resistance value of the detection resistance R4 is 1.5ohm.When the load driving system works normally
It waits, 300mV/R1=300mV/1.5ohm=200mA is set as by the output electric current of the LED light of multiple concatenations.Such as Fig. 2 institute
Show, the input terminal VDD of input voltage source is connected with one end of detection resistance R4, the other end and PMOS tube of detection resistance R4
The source electrode of MP1 is connected, and the drain electrode of PMOS tube MP1 is connected with the LED light of concatenation, and the grid and error of PMOS tube MP1 amplifies
The output end of device is connected.The positive input terminal of error amplifier is connected with 300mV voltage, the negative input end of error amplifier with
The other end of detection resistance R4 is connected.
The pincers die block 13 is divider resistance R5, resistance value 80ohm.As shown in Fig. 2, one end of divider resistance R5 with
The other end of detection resistance R4 is connected, and the other end of divider resistance R5 is connected with the LED light of concatenation.In the present embodiment,
Divider resistance R5 plays the role of auxiliary heat dissipation to PMOS tube MP1 when the load driving system is worked normally.The load
When drive system works normally, a part of continuous current of whole system output can flow through divider resistance R5, and current value is
VCS-LEDP/ R5, if the LED light that OUT+ output voltage is 75V loads, that is, the electric current I for flowing through divider resistance R5 is about (80-
75-0.3)/R2=58.75mA, then the electric current flowed through out of PMOS tube MP1 is 200mA-58.75mA=141.25mA, thus
Reduce the thermal losses of PMOS tube MP1.
The division module 14 includes onunit 141, partial pressure unit 142, current limiting unit 143.Wherein, onunit
141 include first resistor R1, and the Zener diode DZ1 connecting with first resistor R1, the cathode of the Zener diode and institute
The one end for stating first resistor is connected, the plus earth of the Zener diode.Wherein, the first resistor R1 is the Zener
Diode DZ1 provides bias current to provide conducting voltage for the partial pressure unit 142.Partial pressure unit 142 is using its work electricity
Pressure is greater than the resistance to voltage device of the input voltage of the input voltage source, and the N-channel field of 1A/100V specification is used in the present embodiment
Effect pipe MN1, the grid of the N-channel enhancement mode FET MN1 are connected with the cathode of the Zener diode DZ1, institute
The drain electrode for stating N-channel enhancement mode FET MN1 is connected with LED light, the source electrode of the N-channel enhancement mode FET MN1
It is connect with the current limiting unit.Wherein, Zener diode DZ1 is selected suitable according to the predetermined voltage threshold of N-channel field-effect tube MN1
When breakdown voltage, usually selection 7.5V~15V.Current limiting unit 143 includes NPN type triode NPN1, second resistance R2 and the
Three resistance R3, wherein one end of second resistance R2 is connected with the source electrode of N-channel enhancement mode FET MN1, second resistance R2
Other end ground connection, one end of 3rd resistor R3 is connected with one end of second resistance, the other end of 3rd resistor R3 and three poles
The base stage of pipe NPN1 is connected, and the collector of the triode NPN1 is connected with the cathode of the Zener diode DZ1, described
The emitter of triode NPN1 is grounded.In this present embodiment, the resistance value of second resistance R2 is 1.5ohm, the resistance value of 3rd resistor R3
It is 1K ohm.
In the present embodiment, current limliting is carried out to output when can realize generation short circuit between OUT+ and OUT- by the way that Rlim is arranged
Control, the electric current of limitation are Ilim=Vbe/R2=0.55V/R2, and the base stage that Vbe is NPN1 to emitter junction opens conducting pressure
Drop.The setting of Ilim need 1.2~2.5 times of the continuous current exported by constant current linear regulator with ensure work normally when
The constant current operation of constant current linear regulator, while MN1 is also at linear low-loss working condition.For example, the resistance of second resistance R2
Value is 1.5ohm, then Ilim=Vbe/R2=0.55V/1.5ohm=0.3667A, about the 1.84 of constant current value 200mA
Times.
Therefore, when output short-circuit occurs for the load driving system, in Fig. 2, by the lighting module relative to defeated
Enter pressure difference (pressure drop between Fig. 2 VDD and LEDP) pincers to less than predetermined voltage threshold, VDD and CS of the input terminal VDD of voltage source
Between voltage be raised and turn off high-voltage MOS pipe MP1 more than 300mV to divide the load driving of the constant current linear regulator
The sub- input voltage of the first of system, i.e., first sub- input voltage=Ilim × (R4+R5)=0.3667A × (80+1.5)=30V,
First sub- input voltage is the breakdown voltage 48V that 30V is less than high-voltage MOS pipe MP1, ensure that the safety of MP1 pipe.Second son input
Sub- input voltage=the 80-30=50V of voltage=input voltage source input voltage-the first, since the present embodiment uses 1A/100V
The N-channel field-effect tube MN1 of specification is enough to undertake the input voltage of 50V to ensure load driving system when output short-circuit occurs
Each electronic component is in the working range of safety.
The present embodiment provides a kind of load driving method, which is applied to the load driving system 1, described negative
Carrying drive system includes constant current linear regulator, referring to Fig. 3, being shown as stream of the output short-circuit protection method in an embodiment
Journey schematic diagram.As shown in figure 3, the load driving method including the following steps:
S1 carries out constant current driving to the lighting module connecting with the constant current linear regulator；
S2, when output short-circuit occurs for the load driving system, by the lighting module relative to input voltage source
The pressure difference of input terminal clamps to less than predetermined voltage threshold is to divide the first of the load driving system of the constant current linear regulator
Sub- input voltage；Meanwhile
S3 carries out the output electric current of the load driving system when output short-circuit occurs for the load driving system
Current limited Control is with the divide the load driving system second sub- input voltage；The first sub- input voltage and described sub second
Input voltage of the sum of input voltage equal to be set forth in input voltage source.
In conclusion output short circuit protection circuit of the present invention, load driving system and method are realized to negative
If being loaded into row to carry out that short circuit occurs during constant current driving, the electronic device inside constant current linear regulator can be in safety
In working range, and the thermal losses to constant current linear regulator inside chip is reduced in normal work.So the present invention is effective
It overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (11)
1. a kind of output short circuit protection circuit, applied to the load driving system including drive module and load, wherein the drive
Dynamic model block is constant current linear regulator, which is characterized in that the output short circuit protection circuit includes:
Die block is clamped, is connected respectively with the drive module and load, for output short-circuit to occur in the load driving system
When, the pressure difference pincers to less than predetermined voltage threshold of the input terminal by the load relative to input voltage source are to divide the constant current
The sub- input voltage of the first of the load driving system of linear regulator；
Division module is connected with the drive module and load respectively, for output short-circuit to occur in the load driving system
When, it is linear to divide the constant current that Current limited Control is carried out to the output electric current of the load driving system of the constant current linear regulator
The sub- input voltage of the second of the load driving system of adjuster；The first sub- input voltage and the described second sub- input voltage
With the input voltage for being equal to the input voltage source.
2. output short circuit protection circuit according to claim 1, it is characterised in that: the division module includes that conducting is single
Member, the partial pressure unit being connect with the onunit, and the current limiting unit being connect respectively with the partial pressure unit and onunit；
Wherein, the onunit is used to provide conducting voltage for the partial pressure unit；
The partial pressure unit is used for when output short-circuit occurs, for dividing the load driving system of the constant current linear regulator
The second sub- input voltage；
The current limiting unit is used for when output short-circuit occurs, within a predetermined range by output current limit.
3. output short circuit protection circuit according to claim 2, it is characterised in that: the onunit includes the first electricity
Resistance, and the Zener diode being connect with first resistor；Wherein, the first resistor provides bias current for the Zener diode
To provide conducting voltage for the partial pressure unit；The cathode of the Zener diode is connected with one end of the first resistor,
The plus earth of the Zener diode.
4. output short circuit protection circuit according to claim 3, it is characterised in that: the partial pressure unit is a N-channel field
Effect pipe；Wherein, the grid of the N-channel field-effect tube is connected with the cathode of the Zener diode, the N-channel field effect
Should pipe drain electrode with it is described load be connected, the source electrode of the N-channel field-effect tube is connect with the current limiting unit.
5. output short circuit protection circuit according to claim 2, it is characterised in that: the partial pressure unit is using its work electricity
Pressure is greater than the resistance to voltage device of the input voltage of the input voltage source.
6. output short circuit protection circuit according to claim 3, it is characterised in that: the current limiting unit includes triode,
Second resistance and 3rd resistor；Wherein, the collector of the triode is connected with the cathode of the Zener diode, described
The base stage of triode is connected with one end of the second resistance, the emitter ground connection of the triode, the second resistance
The other end is connected with one end of the 3rd resistor, the other end ground connection of the 3rd resistor.
7. output short circuit protection circuit according to claim 1, it is characterised in that: the pincers die block is also used to described
When load driving system works normally, the continuous current of a part of load driving system is shunted.
8. a kind of load driving system, which is characterized in that the load driving system includes:
Drive module is connected with load, for carrying out constant current driving to the load；The drive module is constant current Serial regulation
Device；
Such as the described in any item output short circuit protection circuits of claim 1-7, it connect, is used for the load and drive module
When output short-circuit occurs for the load driving system, to the output electric current flowed through in the drive module and load controlled with
Protect the load driving system.
9. load driving system according to claim 8, it is characterised in that: include one high in the constant current linear regulator
Press metal-oxide-semiconductor；The predetermined voltage threshold is the breakdown voltage of the high-voltage MOS pipe.
10. load driving system according to claim 9, it is characterised in that: one end of the pincers die block and the height
The drain electrode of pressure metal-oxide-semiconductor is connected, and the other end of the pincers die block is connected with the source electrode of the high-voltage MOS pipe.
11. a kind of load driving method, which is characterized in that be applied to load driving system, the load driving system includes perseverance
Cleanliness adjuster, the load driving method including the following steps:
Constant current driving is carried out to the load connecting with the constant current linear regulator；
When output short-circuit occurs for the load driving system, the pressure difference of the input terminal by the load relative to input voltage source
Pincers to less than predetermined voltage threshold are to divide the first sub- input voltage of the load driving system of the constant current linear regulator；Together
When,
When output short-circuit occurs for the load driving system, Current limited Control is carried out to the output electric current of the load driving system
With the divide the load driving system second sub- input voltage；The first sub- input voltage and the described second sub- input voltage
Sum equal to the input voltage source input voltage.
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| CN201610343053.2A CN105870896B (en) | 2016-05-20 | 2016-05-20 | A kind of output short circuit protection circuit, load driving system and method |
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| CN107567130B (en) * | 2017-08-21 | 2023-09-12 | 矽力杰半导体技术(杭州)有限公司 | Power supply circuit and LED driving circuit applying same |
| CN111555643B (en) * | 2020-06-05 | 2024-02-27 | 上海晶丰明源半导体股份有限公司 | Switching power supply controller, switching power supply system and switching power supply system power supply method |
| CN113453405B (en) * | 2021-07-16 | 2023-01-13 | 芯知微(上海)电子科技有限公司 | LED drive circuit and LED lamp |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011077037A (en) * | 2009-09-29 | 2011-04-14 | Cl Tech Co Ltd | Lighting circuit and protection device of led illumination fixture, and the lighting method and the protection method |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN104025712A (en) * | 2011-11-10 | 2014-09-03 | 通用电气公司 | Device for failure protection in lighting devices having light emitting diodes |
| CN104917164A (en) * | 2014-03-11 | 2015-09-16 | 北京动力源科技股份有限公司 | Driving protection circuit |
| CN205846714U (en) * | 2016-05-20 | 2016-12-28 | 上海晶丰明源半导体有限公司 | A kind of output short circuit protection circuit and load driving system |
-
2016
- 2016-05-20 CN CN201610343053.2A patent/CN105870896B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011077037A (en) * | 2009-09-29 | 2011-04-14 | Cl Tech Co Ltd | Lighting circuit and protection device of led illumination fixture, and the lighting method and the protection method |
| CN104025712A (en) * | 2011-11-10 | 2014-09-03 | 通用电气公司 | Device for failure protection in lighting devices having light emitting diodes |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN104917164A (en) * | 2014-03-11 | 2015-09-16 | 北京动力源科技股份有限公司 | Driving protection circuit |
| CN205846714U (en) * | 2016-05-20 | 2016-12-28 | 上海晶丰明源半导体有限公司 | A kind of output short circuit protection circuit and load driving system |
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