CN204377193U - Constant current driver circuit for LED and Switching Power Supply driving chip thereof - Google Patents
Constant current driver circuit for LED and Switching Power Supply driving chip thereof Download PDFInfo
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- CN204377193U CN204377193U CN201420872703.9U CN201420872703U CN204377193U CN 204377193 U CN204377193 U CN 204377193U CN 201420872703 U CN201420872703 U CN 201420872703U CN 204377193 U CN204377193 U CN 204377193U
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Abstract
The utility model belongs to technical field of constant current drive, the utility model provides a kind of constant current driver circuit for LED and Switching Power Supply driving chip thereof, Switching Power Supply driving chip comprises: burn mode transfer block, memory module, switch module, export acquisition module and constant-current control module, burn mode transfer block calculates the fiducial value of the first feedback voltage and setting voltage difference when receiving electric current and burning and adjust enable signal, voltage difference is converted to electric current and burn tune control signal, and electric current burning adjusted control signal stored by memory module and be sent to constant-current control module, the switching frequency that constant-current control module burns regulation and control Signal-controlled switch device processed according to electric current and/or flow through switching device peak current to change the output current of output-stage circuit, mode transfer block and memory module is burnt by arranging, realize obtaining different constant current output specifications with same circuit, in addition, circuit effectively can also solve the system output current consistency problem that peripheral components brings.
Description
Technical field
The utility model belongs to technical field of constant current drive, particularly relates to a kind of constant current driver circuit for LED and Switching Power Supply driving chip thereof.
Background technology
LED illumination light source has the advantages such as environmental protection, energy-conservation, the life-span is long, is regarded as the lighting source of 21st century most prospect at present.For obtaining desirable illuminating effect, LED light source needs constant-current driving power supply.Current constant-current driving power supply is on the market all adjust carrying out burning during single chips finished product test, the impact that the difference cannot eliminating peripheral components parameter is brought system output current consistency; Prior art is all the different corresponding different systems of output specification and different components and parts simultaneously, do not support online regulation output electric current, under the prerequisite not changing system peripheral devices, the specification of output current can not be changed on a large scale, be not easy to production management, production efficiency is low.In sum, there is the non-adjustable production that causes of the output current of constant-current driving power supply and the limitation of application and the consistency problem of constant current output in prior art.
Utility model content
The purpose of this utility model is to provide a kind of constant current driver circuit for LED and Switching Power Supply driving chip thereof, is intended to solve in prior art the non-adjustable production that causes of the output current that there is LED constant current driving power and the limitation of application and the consistency problem of constant current output.
The utility model is achieved in that a kind of Switching Power Supply driving chip, is connected with the input stage circuit in LED drive circuit and output-stage circuit, and the output of described output-stage circuit connects load;
Described Switching Power Supply driving chip comprises: burn mode transfer block, memory module, switch module, output acquisition module and constant-current control module;
The input of described switch module connects the output of described input stage circuit, the output of described switch module connects the first input end of described constant-current control module, first output of described constant-current control module connects the input of described output-stage circuit, second output of described constant-current control module connects the first control end of described switch module, the pressure feedback port of described output-stage circuit connects the input of described output acquisition module, first output of described output acquisition module connects the second input of described constant-current control module, second output of described output acquisition module connects the input of described burning mode transfer block, the output of described burning mode transfer block connects the input of described memory module, the output of described memory module connects the 3rd input of described constant-current control module,
Described output acquisition module is for gathering the output information of described output-stage circuit, this module is also for when the output of described output-stage circuit connects the first load, first feedback voltage level is obtained to the output information collection of described output-stage circuit, and described first feedback voltage is sent to described burning mode transfer block and described constant-current control module, wherein, described first load is test resistance;
Described burning mode transfer block is used for received current and burns tune enable signal, and when receiving described electric current and burning and adjust enable signal, the fiducial value of described first feedback voltage level and setting is being compared, and generate electric current burning tune control signal according to comparative result, and control signal is adjusted to send to described memory module described electric current burning;
Described memory module burns tune control signal for preserving described electric current, and described electric current burning tonal signal is sent to described constant-current control module;
Described constant-current control module is for controlling the constant of output current, this module also adjusts control signal and described first feedback voltage control the switching frequency of the switching device in described switch module and/or flow through the peak current of switching device for burning according to described electric current, make the output current of described output-stage circuit be the second current value, and keep when the output termination LED load of described output-stage circuit exporting described second current value.
Described burning mode transfer block comprises: burn and adjust judging unit, error amplifier and analog to digital converter;
Described burning adjust judging unit for judge input signal as electric current burn adjust enable signal time to described error amplifier output enable signal;
When described error amplifier is used for receiving described enable signal, obtains voltage difference after the fiducial value of described first feedback voltage level and described setting is carried out additive operation and described voltage difference is amplified;
Described analog to digital converter obtains electric current burning tune control signal for the described voltage difference after amplification being carried out analog-to-digital conversion.
Described constant-current control module comprises logical operation circuit and peak limiter circuit, the first input end of described peak limiter circuit is the first input end of described constant-current control module, the first input end of described logical operation circuit is the second input of described constant-current control module, 3rd input of described constant-current control module connects the second input of described peak limiter circuit and/or connects the 3rd input of described logical operation circuit, first output of described peak limiter circuit is the first output of described constant-current control module, second output of described peak limiter circuit connects the second input of described logical operation circuit, the output of described logical operation circuit is the second output of described constant-current control module,
Described peak limiter circuit flows through the current value of described switch module breaker in middle device for detecting, and when this current value reaches preset value, export control signal to described logical operation circuit, the control signal that described logical operation circuit reception exports the output feedack information of acquisition module sampling, the described electric current of described memory module transmission burns tune control signal and peak limiter circuit transmits controls conducting and the cut-off of the switching device of described switch module;
When described memory module sends described electric current burning tune control signal to described peak limiter circuit and/or described logical operation circuit, described peak limiter circuit burns according to described electric current adjusts control signal to export control signal to described logical operation circuit, and described logical operation circuit burns the switching frequency that the control signal adjusting control signal and described peak limiter circuit to export controls described switch module breaker in middle device and/or the peak current flowing through switching device to change the output current of described output-stage circuit according to described first feedback voltage, described electric current.
Described peak limiter circuit comprises threshold regulating circuit, comparator and detection resistance;
The first end of described detection resistance connects the in-phase input end of described comparator, the first end of described detection resistance is the first input end of described peak limiter circuit, second end of described detection resistance is the first output of described peak limiter circuit, the output of described threshold regulating circuit connects the inverting input of described comparator, the input of described threshold regulating circuit is the second input of described peak limiter circuit, and the output of described comparator is the second output of described peak limiter circuit.
Described Switching Power Supply driving chip also comprises overheat protector module;
Second output of described memory module connects the input of described overheat protector module, and the output of described overheat protector module connects the second control end end of described switch module;
Described burning mode transfer block also burns tune control signal for receiving temperature, and adjusts control signal to send to described memory module described temperature burning;
Described memory module also burns tune control signal for preserving described temperature, and adjusts control signal to send to described overheat protector module described temperature burning;
Described overheat protector module is used for burning switch module described in regulation and control signal controlling processed according to described temperature, to change the warm spot excessively of described Switching Power Supply driving chip.
Described memory module is EEPROM.
The utility model also provides a kind of constant-current LED constant-current drive circuit, comprises above-mentioned Switching Power Supply driving chip, input stage circuit and output-stage circuit, and described Switching Power Supply driving chip is connected with described input stage circuit and described output-stage circuit respectively.
The utility model provides a kind of constant current LED drive circuit and Switching Power Supply driving chip thereof, mode transfer block and memory module is burnt when receiving after electric current burns tune enable signal by arranging, spontaneously regulated by chip internal circuits completely, without the need to changing any system components and parts, can realize the constant current output obtaining multiple different size with same circuit, improve the scope of application of whole driving chip, circuit support burns tune online, be convenient to production management, enhance productivity; Meanwhile, the system output current consistency problem that circuit peripheral component variations causes can effectively be solved.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of LED drive circuit of providing of the utility model embodiment and Switching Power Supply driving chip thereof;
Fig. 2 is the structural representation of a kind of LED drive circuit of providing of the utility model embodiment and Switching Power Supply driving chip thereof;
Fig. 3 is the current waveform schematic diagram working in discontinuous conduction mode of a kind of Switching Power Supply driving chip that the utility model embodiment provides;
Fig. 4 is the current waveform schematic diagram working in critical conduction mode of a kind of Switching Power Supply driving chip that the utility model embodiment provides;
Fig. 5 is the structural representation burning mode transfer block in a kind of Switching Power Supply driving chip of providing of the another kind of embodiment of the utility model;
Fig. 6 is the structural representation of a kind of LED drive circuit of providing of the another kind of embodiment of the utility model and Switching Power Supply driving chip thereof.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In order to technical scheme described in the utility model is described, be described below by specific embodiment.Below in conjunction with Fig. 1, in detail the course of work of the constant-current drive circuit of the employing Switching Power Supply driving chip that the utility model provides is described:
A kind of embodiment of the utility model provides a kind of Switching Power Supply driving chip 20, as shown in Figure 1, is connected with the input stage circuit 10 in LED drive circuit and output-stage circuit 30, and the output of output-stage circuit 30 connects load; Switching Power Supply driving chip comprises: burn mode transfer block 201, memory module 206, switch module 207, export acquisition module 202 and constant-current control module 210.
The input of switch module 207 connects the output of input stage circuit 10, the output of switch module 207 connects the first input end of constant-current control module 210, first output of constant-current control module 210 connects the input of output-stage circuit 30, first control end of the second output connecting valve module 207 of constant-current control module 210, the pressure feedback port of output-stage circuit 30 connects the input exporting acquisition module 202, the first output exporting acquisition module 202 connects the second input of constant-current control module 210, the second output exporting acquisition module connects the input burning mode transfer block 201, the output burning mode transfer block 201 connects the input of memory module 206, the output of memory module 206 connects the 3rd input of constant-current control module 210.
Export acquisition module 202 for gathering the output information of output-stage circuit 30, export acquisition module 202 also for when the output of output-stage circuit 30 connects the first load, first feedback voltage level is obtained to the output information collection of output-stage circuit 30, and the first feedback voltage is sent to burning mode transfer block 201 and constant-current control module 210, wherein, the first load is test resistance.
Burn mode transfer block 201 and burn tune enable signal for received current, and when receiving electric current and burning and adjust enable signal, the fiducial value of the first feedback voltage level and setting is being compared, and generate electric current burning tune control signal according to comparative result, and control signal is adjusted to send to memory module 206 electric current burning.
Memory module 206 is burnt adjust control signal for being preserved electric current, and electric current is burnt tonal signal and send to constant-current control module 210.
Constant-current control module 210 is for controlling the constant of output current, constant-current control module 210 is also for burning the switching frequency adjusting the switching device in control signal and the first feedback voltage adjustment switch module 207 and/or the peak current flowing through switching device according to electric current, make the output current of output-stage circuit 30 be adjusted to the second current value, and keep output second current value when the output termination LED load of output-stage circuit 30.
As shown in Figure 2, for constant-current control module 210, it comprises logical operation circuit 203 and peak limiter circuit 204, the first input end of peak limiter circuit 204 is the first input end of constant-current control module 210, the first input end of logical operation circuit 203 is the second input of constant-current control module 210, , 3rd input of constant-current control module 210 connects the second input of peak limiter circuit 204 and/or the 3rd input of logical operation circuit 203, first output of peak limiter circuit 204 is the first output of constant-current control module 210, second output of peak limiter circuit 204 connects the second input of logical operation circuit 203, the output of logical operation circuit 203 is the second output of constant-current control module 210, peak limiter circuit 204 detects the current value flowing through switch module 207 breaker in middle device, and when this current value reaches preset value, control signal is exported to logical operation circuit 203, logical operation circuit 203 receives the output feedack information exporting acquisition module 202 and sample, the electric current that memory module 206 sends burns conducting and the cut-off of the switching device of the control switch module 207 adjusting control signal and peak limiter circuit 204 to transmit.
When memory module 206 stores concurrent power transmission stream burning tune control signal to peak limiter circuit 204 and/or logical operation circuit 203, peak limiter circuit 204 burns according to electric current adjusts control signal to export control signal to logical operation circuit 203, the switching frequency that logical operation circuit 203 burns the control signal control switch module 207 breaker in middle device adjusting control signal and peak limiter circuit 204 to export according to the first feedback voltage, electric current and/or flow through switching device peak current to change the output current of output-stage circuit 30.
For peak limiter circuit 204, it comprises threshold regulating circuit, comparator and detection resistance;
The first end detecting resistance connects the in-phase input end of comparator, the first end detecting resistance is the first input end of peak limiter circuit 204, the second end detecting resistance is the first output of peak limiter circuit 204, the output of threshold regulating circuit connects the inverting input of comparator, the input of threshold regulating circuit is the second input of peak limiter circuit 204, and the output of comparator is the second output of peak limiter circuit 204.
For switch module 207, it comprises switch control module and switching device, the input of switching device is the input of switch module 207, the output of switching device is the output of switch module 207, the first input end of switch control module is the first control end of switch module 207, second input of switch control module is the second control end of switch module 207, the control end of the output connecting valve device of switch control module.
For memory module 206, preferably, memory module 206 is EEPROM.
In the utility model embodiment, after Switching Power Supply driving chip powers on, electric current flows through the switching device Q1 in switch module 207, and switching device current sense resistor R3 produces pressure drop, when switching device electric current reaches peak-limitation electric current I
pKtime, comparator output switching activity, control switch device Q1 ends; Inductance L starts release energy (being now in degaussing phase), induced voltage and the output voltage at inductance L two ends are basically identical (only having the difference of the forward voltage drop of a diode), feedback circuit is sampled to output voltage, determine demagnetization end point, with in suitable moment control switch device Q1 conducting, as shown in Figure 3 and Figure 4, now output current equals the mean value of inductive current, and output current expression formula is
wherein T
onfor switching tube Q1 ON time, T
dfor the inductance erasing time, T is switch periods, peak current
resistance R3 is built-in; For critical conduction mode, as special circumstances, have
so
output current has nothing to do with input voltage and output voltage size, as long as ensure I
pKwith
constant, export and just can realize constant current.
Adjustable in order to realize the output current of constant-current drive circuit, arrange in Switching Power Supply driving chip and burn mode transfer block 201 and memory module 206, to realize adjusting the burning of output current, concrete, as shown in Figure 5, burn mode transfer block 201 to comprise: burn and adjust judging unit 2013, error amplifier 2011 and analog to digital converter 2012.
Burn adjust judging unit 2013 for judge input signal as electric current burn adjust enable signal time to error amplifier 2011 output enable signal; When error amplifier 2011 is for receiving enable signal, obtains voltage difference after the fiducial value of the first feedback voltage level and setting is carried out additive operation and voltage difference is amplified; Analog to digital converter 2012 obtains electric current burning tune control signal for the voltage difference after amplification being carried out analog-to-digital conversion.
It should be noted that, the fiducial value of setting can be Switching Power Supply driving chip inner setting, also can be provided by outside.
Composition graphs 1 and Fig. 2 more below, a kind of switch power source driving circuit provided the utility model in detail changes the principle exporting specification and is described:
The switching tube current information that Switching Power Supply driving chip 20 is sampled according to switching tube peak current sampling resistor (detection resistance) R3, the output information exporting acquisition module 202 collection, the initial output current of output stage controlling constant current driver circuit for LED is I
1, export acquisition module 202 according to the output voltage sampling feedback voltage of output-stage circuit 30, and at inductance L degaussing phase, feedback voltage and output voltage V
outthere is following relational expression:
when needing to obtain different output current I
2(I
2≠ I
1) time, need the output termination first load resistance R at output-stage circuit 30
test1, i.e. R
test1in parallel with R4, now, the feedback voltage that output acquisition module 202 collects is the first feedback voltage V
fB, meanwhile, need setting fiducial value V
ref(this fiducial value can be produced by Switching Power Supply driving chip inside, also can be provided by external circuit), and make it satisfied:
and then input effective electric current burning tune enable signal, after burning in the burning mode transfer block 201 of Switching Power Supply driving chip inside adjusts judging unit 2013 to receive electric current burning tune enable signal, judge now to need to adjust output current, burn and adjust judging unit 2013 output enable signal, departure amplifier 2011 is by the first feedback voltage V
fBwith the fiducial value V of setting
refcompare, because output current also has little time to change, so the first feedback voltage V that feedback port samples
fBand be not equal to the fiducial value V of setting
ref, the difference of these two values is amplified by error amplifier 2011, and result is passed in A/D converter, A/D converter is according to the result of error amplifier 2011, produce corresponding electric current and burn tune control signal, and pass in memory module 206, memory module 206 storaging current burns adjusts control signal, and adjust control signal to be sent to constant-current control module 210 electric current burning, constant-current control module 210 burns according to electric current adjusts control signal, switching tube peak current information and output feedack information, produce corresponding switching signal, be sent to switch module 207, switch control module is according to the conducting of switching signal control switch pipe Q1 and cut-off, finally make feedback voltage V
fBwith the fiducial value V of setting
refequal, now, obtaining output current is I
2.After this, need the electric current burning inputted outside to adjust enable signal to be set to invalid, then remove test resistance R
test1; And burn tune control signal because memory module 206 stores electric current, power on after making constant current driver circuit for LED power-off, output current continues to remain I again
2.In the above process, do not change the parameter of any components and parts on constant current driver circuit for LED plate, achieve and use same system, same BOOM mono-, obtain the output current of different size; Meanwhile, do not change the constant current principle of constant current driver circuit for LED yet, do not affect the constant-current characteristics of constant current driver circuit for LED.
Therefore, under test mode, only just carry out burning adjust; Expect different output currents, just need under test mode, export the resistance of the corresponding resistance of termination.
How the technical scheme that explained later the utility model provides effectively reduces system peripheral devices difference to the impact of output current:
Current power supply chip on the market, although carried out burning adjusting to some parameters of chip, but the impact that the difference cannot eliminating system peripherals components and parts produces output current, for the different driving power-supply system of same output specification, same BOM (BOM is mono-), in batch production, the difference between components and parts can affect output current, causes the inconsistent of output current, as switching tube current sampling resistor, directly output current can be affected.
In the technical scheme that the utility model provides, when the output termination test resistance load of output-stage circuit 30, due to the deviation of chip internal parameter and the difference of system peripherals components and parts, the impact that can produce output current, finally all can be reacted on output voltage; For the different system that same output specification, same BOM are mono-, export when connecing same load and same test resistance, assuming that voltage V
1feedback voltage corresponding to target current, the fiducial value namely set, this fiducial value by Switching Power Supply driving chip inner setting, also can be provided by external circuit; Due to the deviation of Switching Power Supply driving chip inner parameter and the difference of constant current driver circuit for LED peripheral component, feedback end samples feedback voltage V
2, and feedback voltage V
2with voltage V
1and it is inconsistent, the difference (the Δ V value of different system) of these two voltages, it is exactly the difference reaction on the output voltage of constant current driver circuit for LED peripheral component, Switching Power Supply driving chip is inner when calculating burning tune mode, the difference of voltage change also can be counted, by revising the expression formula of output current, after finally making system stability, the feedback voltage that feedback module samples is all the feedback voltage V that target current is corresponding
1, output current is also all target current, and such output current is not just by the impact of the difference of peripheral component.
A kind of Switching Power Supply driving chip of the another kind of embodiment of the utility model, as shown in Figure 6, Switching Power Supply driving chip also comprises overheat protector module 205; Second output of memory module 206 connects the input of overheat protector module 205, the second control end of the output connecting valve module 207 of overheat protector module 205; Burn mode transfer block 201 and also burn tune control signal for receiving temperature, and adjust control signal to send to memory module 206 temperature burning; Memory module 206 is also burnt for storage temperature and is adjusted control signal, and adjusts control signal to send to overheat protector module 205 temperature burning; Overheat protector module 205 for according to temperature burn regulation and control Signal-controlled switch module 207 processed, with change Switching Power Supply driving chip mistake warm spot.
Detailed process is as follows: burn mode transfer block 201 and also burn tune enable signal for receiving temperature; When the temperature burning tune enable signal of outside input is effective, the burning tune judging unit 2013 burnt in mode transfer block 201 is judged as that now needing to carry out burning to overheat protector point adjusts, and now needs outside input temp burning tune control signal again, burns the mode of tune with control temperature; Burn and adjust judging unit 2013 to receive temperature burning tune control signal again; and directly adjust control signal to be sent in EEPROM temperature burning; EEPROM stores and temperature is burnt and adjusts control signal to be sent in overheat protector module 205; overheat protector module 205 is burnt according to temperature and is adjusted control signal; regulate the overheat protector point of chip; control switch power drives chip, when temperature reaches the overheat protector point of new settings, enters overheat protector state.
Above two kinds of differences of burning tune mode are: carry out burning timing to the output current of constant current driver circuit for LED, chip adapts to the change of load automatically, automatic generation current burns adjusts control signal, thus control output current, burn without the need to the outside input current of tester and adjust control signal, outside only needs input enable signal, and Switching Power Supply driving chip is changed between burning tune state and normal operating conditions; And burning timing is carried out to chip over-temperature protection point, need tester manually to calculate the mode of burning and adjusting, burn from outside input temp and adjust control signal, to realize the change to crossing warm spot.
The utility model also provides a kind of constant current driver circuit for LED, comprise above-mentioned Switching Power Supply driving chip 20, input stage circuit 10 and output-stage circuit 30, described Switching Power Supply driving chip is connected with described input stage circuit 10 and described output-stage circuit 30 respectively.
The utility model provides a kind of constant current driver circuit for LED and Switching Power Supply driving chip thereof, mode transfer block 201 and memory module 206 is burnt when receiving after electric current burns tune enable signal by arranging, spontaneously regulated by chip internal circuits completely, without the need to changing any system components and parts, can realize the constant current output obtaining multiple different size with same circuit, improve the scope of application of whole driving chip, circuit support burns tune online, be convenient to production management, enhance productivity; Meanwhile, the system output current consistency problem that circuit peripheral component variations causes can effectively be solved.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make some equivalent alternative or obvious modification without departing from the concept of the premise utility; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (7)
1. a Switching Power Supply driving chip, is connected with the input stage circuit in LED drive circuit and output-stage circuit, and the output of described output-stage circuit connects load, it is characterized in that:
Described Switching Power Supply driving chip comprises: burn mode transfer block, memory module, switch module, output acquisition module and constant-current control module;
The input of described switch module connects the output of described input stage circuit, the output of described switch module connects the first input end of described constant-current control module, first output of described constant-current control module connects the input of described output-stage circuit, second output of described constant-current control module connects the first control end of described switch module, the pressure feedback port of described output-stage circuit connects the input of described output acquisition module, first output of described output acquisition module connects the second input of described constant-current control module, second output of described output acquisition module connects the input of described burning mode transfer block, the output of described burning mode transfer block connects the input of described memory module, the output of described memory module connects the 3rd input of described constant-current control module,
Described output acquisition module is for gathering the output information of described output-stage circuit, this module is also for when the output of described output-stage circuit connects the first load, first feedback voltage level is obtained to the output information collection of described output-stage circuit, and described first feedback voltage is sent to described burning mode transfer block and described constant-current control module, wherein, described first load is test resistance;
Described burning mode transfer block is used for received current and burns tune enable signal, and when receiving described electric current and burning and adjust enable signal, the fiducial value of described first feedback voltage level and setting is being compared, and generate electric current burning tune control signal according to comparative result, and control signal is adjusted to send to described memory module described electric current burning;
Described memory module burns tune control signal for preserving described electric current, and described electric current burning tonal signal is sent to described constant-current control module;
Described constant-current control module is used for burning according to described electric current adjusting control signal and described first feedback voltage control the switching frequency of the switching device in described switch module and/or flow through the peak current of switching device, make the output current of described output-stage circuit be the second current value, and keep when the output termination LED load of described output-stage circuit exporting described second current value.
2. Switching Power Supply driving chip as claimed in claim 1, it is characterized in that, described burning mode transfer block comprises: burn and adjust judging unit, error amplifier and analog to digital converter;
Described burning adjust judging unit for judge input signal as electric current burn adjust enable signal time to described error amplifier output enable signal;
When described error amplifier is used for receiving described enable signal, obtains voltage difference after the fiducial value of described first feedback voltage level and described setting is carried out additive operation and described voltage difference is amplified;
Described analog to digital converter obtains electric current burning tune control signal for the described voltage difference after amplification being carried out analog-to-digital conversion.
3. Switching Power Supply driving chip as claimed in claim 1, it is characterized in that, described constant-current control module comprises: logical operation circuit and peak limiter circuit;
The first input end of described peak limiter circuit is the first input end of described constant-current control module, the first input end of described logical operation circuit is the second input of described constant-current control module, 3rd input of described constant-current control module connects the second input of described peak limiter circuit and/or connects the 3rd input of described logical operation circuit, first output of described peak limiter circuit is the first output of described constant-current control module, second output of described peak limiter circuit connects the second input of described logical operation circuit, the output of described logical operation circuit is the second output of described constant-current control module,
Described peak limiter circuit flows through the current value of described switch module breaker in middle device for detecting, and when described current value reaches preset value, export control signal to described logical operation circuit, described logical operation circuit burns for the described electric current receiving the output feedack information of described output acquisition module sampling, described memory module sends conducting and the cut-off that the control signal adjusting control signal and described peak limiter circuit to transmit controls the switching device of described switch module;
When described memory module sends described electric current burning tune control signal to described peak limiter circuit and/or described logical operation circuit, described peak limiter circuit burns according to described electric current adjusts control signal to export control signal to described logical operation circuit, and described logical operation circuit burns the switching frequency that the control signal adjusting control signal and described peak limiter circuit to export controls described switch module breaker in middle device and/or the peak current flowing through switching device to change the output current of described output-stage circuit according to described first feedback voltage, described electric current.
4. Switching Power Supply driving chip as claimed in claim 3, it is characterized in that, described peak limiter circuit comprises threshold regulating circuit, comparator and detection resistance;
The first end of described detection resistance connects the in-phase input end of described comparator, the first end of described detection resistance is the first input end of described peak limiter circuit, second end of described detection resistance is the first output of described peak limiter circuit, the output of described threshold regulating circuit connects the inverting input of described comparator, the input of described threshold regulating circuit is the second input of described peak limiter circuit, and the output of described comparator is the second output of described peak limiter circuit.
5. Switching Power Supply driving chip as claimed in claim 3, it is characterized in that, described Switching Power Supply driving chip also comprises overheat protector module;
The output of described memory module connects the input of described overheat protector module, and the output of described overheat protector module connects the second control end of described switch module;
Described burning mode transfer block also burns tune control signal for receiving temperature, and adjusts control signal to send to described memory module described temperature burning;
Described memory module also burns tune control signal for preserving described temperature, and adjusts control signal to send to described overheat protector module described temperature burning;
Described overheat protector module is used for burning switch module described in regulation and control signal controlling processed according to described temperature, to change the warm spot excessively of described Switching Power Supply driving chip.
6. Switching Power Supply driving chip as claimed in claim 1, it is characterized in that, described memory module is the non-volatile storage mediums such as EEPROM.
7. a constant current driver circuit for LED, it is characterized in that, comprise Switching Power Supply driving chip, input stage circuit and the output-stage circuit described in any one of claim 1 to 6, described Switching Power Supply driving chip is connected with described input stage circuit and described output-stage circuit respectively.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636264A (en) * | 2015-12-11 | 2016-06-01 | 古道雄 | LED photoelectric module and driving chip therefor |
| CN110320952A (en) * | 2019-07-22 | 2019-10-11 | 苏州欧普照明有限公司 | A kind of thermal-shutdown circuit and system |
| CN110868778A (en) * | 2019-11-18 | 2020-03-06 | 深圳智芯半导体科技有限公司 | Constant current control method for low-voltage difference of LED driving input and output |
| CN111669870A (en) * | 2020-04-29 | 2020-09-15 | 杭州涂鸦信息技术有限公司 | Constant current control chip and constant current control device |
| CN110320952B (en) * | 2019-07-22 | 2024-05-31 | 苏州欧普照明有限公司 | Over-temperature protection circuit and system |
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2014
- 2014-12-31 CN CN201420872703.9U patent/CN204377193U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636264A (en) * | 2015-12-11 | 2016-06-01 | 古道雄 | LED photoelectric module and driving chip therefor |
| CN105636264B (en) * | 2015-12-11 | 2018-05-04 | 深圳市长运通半导体技术有限公司 | LED photovoltaic module and its driving chip |
| CN110320952A (en) * | 2019-07-22 | 2019-10-11 | 苏州欧普照明有限公司 | A kind of thermal-shutdown circuit and system |
| CN110320952B (en) * | 2019-07-22 | 2024-05-31 | 苏州欧普照明有限公司 | Over-temperature protection circuit and system |
| CN110868778A (en) * | 2019-11-18 | 2020-03-06 | 深圳智芯半导体科技有限公司 | Constant current control method for low-voltage difference of LED driving input and output |
| CN110868778B (en) * | 2019-11-18 | 2022-04-19 | 深圳智芯半导体科技有限公司 | Constant current control method for low-voltage difference of LED driving input and output |
| CN111669870A (en) * | 2020-04-29 | 2020-09-15 | 杭州涂鸦信息技术有限公司 | Constant current control chip and constant current control device |
| CN111669870B (en) * | 2020-04-29 | 2022-12-02 | 杭州涂鸦信息技术有限公司 | Constant current control chip and constant current control device |
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