CN104918384A - Constant flow source predrive circuit and control method thereof - Google Patents

Constant flow source predrive circuit and control method thereof Download PDF

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Publication number
CN104918384A
CN104918384A CN201510339540.7A CN201510339540A CN104918384A CN 104918384 A CN104918384 A CN 104918384A CN 201510339540 A CN201510339540 A CN 201510339540A CN 104918384 A CN104918384 A CN 104918384A
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voltage
constant
current source
output
reference voltage
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张永良
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Changzhou Plunger Tip Semiconductor Technology Co Ltd
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Changzhou Plunger Tip Semiconductor Technology Co Ltd
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Abstract

The invention relates to a constant flow source predrive circuit and a control method thereof. The constant flow source predrive circuit comprises a plurality of LED module groups in series connection, a plurality of constant flow source control units, a constant flow source voltage detecting unit and a logic control unit, wherein a plurality of LED lamp beads are arranged in each LED module group; the constant flow source voltage detecting unit is used for collecting the output voltage of the LED module groups in series connection, and a control signal for disconnecting or conducting the constant flow source control unit is obtained according to the output voltage compared with an upper limit reference voltage or a lower limit reference voltage; and the logic control unit is used for controlling the disconnection or conduction of the constant current source control unit according to the control signal so as to lighten or extinguish the corresponding LED module groups. Voltage regulation of an error amplifier for a switch tube is not needed, and the risk of power supply explosion caused by efficiency reduction or overhigh voltage due to the fact that a great deal of power consumption of voltage at two ends of the switch tube is generated is avoided; and the error amplifier and metal oxide semiconductors (MOSs) are saved, so that the device size can be reduced, and the system cost is reduced.

Description

A kind of constant-current source predrive circuit and control method thereof
Technical field
The present invention relates to LED control field, particularly one is applicable to the constant-current source predrive circuit that light-emitting diode (LED) drives.
Background technology
At present, the use of light-emitting diode (LED) is more and more universal, and user is to which proposing more and more higher requirement.Wherein MOS pipe heating problem is because relating to safety and LED useful life, therefore more and more comes into one's own.
Build LED module by several LED, realize the control to this dot matrix by a switching tube, due to outer net voltage fluctuation, the voltage at these switching tube two ends can be fluctuated, cause switching tube to transship and generate heat, so that damage.In actual applications, in special application scenario, the advantage of constant-current source has become shortcoming on the contrary: supply voltage can not be stable circuit in, if use constant-current source biased, along with the rising of voltage, the transistor electric current amplified is constant, but voltage rise, the pipe consumption of transistor can synchronously rise, and finally causes transistor damage, thus the damage of detonator circuit.
Summary of the invention
The object of this invention is to provide a kind of constant-current source predrive circuit, this constant-current source predrive circuit solves when input voltage fluctuation, the output voltage of LED module is carried out to the technical problem of constant-current source control.
In order to solve the problems of the technologies described above, the invention provides a kind of constant-current source predrive circuit, comprising:
Some constant-current source control units, it is in parallel with each LED module group respectively; Constant-current source voltage detection unit, for gathering the output voltage of series LED module group, and according to this output voltage and upper limit reference voltage or lower limit reference voltage compare, to obtain the control signal of shutoff or conducting constant-current source control unit; Logic control element, for controlling constant-current source according to described control signal
Control unit turns off or conducting, lights to make corresponding LED module group or extinguishes.
Further, in order to obtain precise voltage comparative result, described constant-current source voltage detection unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively; The in-phase end access upper limit reference voltage of described upper voltage limit comparator, the end of oppisite phase access lower limit reference voltage of described lower voltage limit comparator.
Further, in order to carry out constant-current source control, described logic control element adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator; The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of shifting deposit unit with the output of door; The output of described shifting deposit unit is connected with the control end of each constant-current source control unit respectively.
On the basis of technique scheme, present invention also offers a kind of control method of constant-current source predrive circuit, wherein, described constant-current source predrive circuit comprises: several constant-current source control units, constant-current source voltage detection unit, logic control element in parallel with each LED module group respectively; Described control method comprises: constant-current source voltage detection unit gathers the output voltage of series LED module group, and according to output voltage and the upper limit reference voltage preset or lower limit reference voltage compare, to obtain the control signal of shutoff or conducting constant-current source control unit; Logic control element controls constant-current source control unit according to described control signal and turns off or conducting, lights to make corresponding LED module group or extinguishes.
Further, described constant-current source voltage detection unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to the end of oppisite phase of described upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively; The in-phase end of described upper voltage limit comparator accesses described upper limit reference voltage, and the end of oppisite phase of described lower voltage limit comparator accesses described lower limit reference voltage; If described output voltage is greater than upper limit reference voltage, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal turned off for constant-current source control unit; If described output voltage is less than lower limit reference voltage, described constant-current source voltage detection unit then exports the control signal being suitable for making logic control element generation for the conducting of constant-current source control unit; If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal maintained the original state for constant-current source control unit.
Further, described logic control element adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator; The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of described shifting deposit unit with the output of door; The output of described shifting deposit unit is connected with the control end of each constant-current source control unit respectively; When the input voltage fluctuation of series LED module group; If described output voltage is greater than upper limit reference voltage, described upper voltage limit comparator exports high level, lower voltage limit comparator output low level, and control described and door output pulse signal, and make described shifting deposit unit export the shift signal that constant-current source control unit is turned off successively, control corresponding LED module group to light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage; If described output voltage is less than lower limit reference voltage, described upper voltage limit comparator output low level, lower voltage limit comparator exports high level, and control described and door output pulse signal, and make described shifting deposit unit export the shift signal making the conducting of constant-current source control unit successively, control corresponding LED module group to extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage; If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described upper voltage limit comparator, lower voltage limit comparator all export high level, and control described and door output low level, and the output of described shifting deposit unit is maintained the original state, namely each LED module group maintains the original state.
Technique scheme of the present invention has the following advantages compared to existing technology: (1) the present invention accurately obtains comparative voltage by constant-current source voltage detection unit, and andlogic control unit coordinates, achieve and LED module group is regulated and controled, namely, when input voltage raises, access multiple LED module group, raise to make LED control circuit corresponding voltage, when input voltage reduces, make some LED module groups by short circuit, LED control circuit corresponding voltage is declined, controls to play constant-current source; (2) improve the useful life of LED lamp pearl, and the stability of whole circuit; (3) without the need to carrying out voltage-regulation by error amplifier switch tube, having evaded and having caused efficiency to reduce even overtension causing power supply aircraft bombing risk because switching tube both end voltage produces a large amount of power consumption; (4) saving error amplifier and MOS can reduce device volume and reduce system cost.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation.
Fig. 1 is the theory diagram of constant-current source predrive circuit of the present invention.
Fig. 2 is the theory diagram of constant-current source voltage detection unit andlogic control unit of the present invention.
Wherein, switching tube 1, upper voltage limit comparator A1, lower voltage limit comparator A2, upper limit reference voltage VREF1, lower limit reference voltage VREF2, input voltage Ui, output voltage Uo, shifting deposit unit U1, upper voltage limit comparator export UoA1, lower voltage limit comparator export UoA2.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Embodiment 1
As shown in Fig. 1, a kind of constant-current source predrive circuit, comprising: some constant-current source control units, and it is in parallel with each LED module group respectively, wherein, is provided with some led lamp pearls in described LED module group, and the series connection of several LED module groups.
Constant-current source voltage detection unit, for gathering the output voltage of series LED module group, and compares with upper limit reference voltage VREF1 or lower limit reference voltage VREF2 according to this output voltage Uo, to obtain the control signal of shutoff or conducting constant-current source control unit.
Logic control element, turning off or conducting for controlling constant-current source control unit according to described control signal, lighting to make corresponding LED module group or extinguishing.
Wherein, described constant-current source control unit can adopt switch element to realize.
Described constant-current source voltage detection unit front end can also be connected with a detecting voltage unit, and this detecting voltage unit is used for carrying out suitable step-down to output voltage Uo, collects suitable voltage range to make described constant-current source voltage detection unit.
Several LED module groups described are connected afterwards and switching tube 1 forms primary Ioops, enter saturation condition make the conducting of each LED module group to light by switching tube 1, and this switching tube 1 also can replace with corresponding LED driving chip.
Described detecting voltage unit, startup control unit belong to standard element, all having relevant discussion, discuss no longer in detail here in prior art.
As shown in Fig. 2, described constant-current source voltage detection unit comprises: upper voltage limit comparator A1, lower voltage limit comparator A2, and described output voltage Uo is connected to the end of oppisite phase of upper voltage limit comparator A1 and the in-phase end of lower voltage limit comparator A2 respectively; The end of oppisite phase access lower limit reference voltage VREF2 of the in-phase end access upper limit reference voltage VREF1 of described upper voltage limit comparator A1, described lower voltage limit comparator A2.
Described logic control element adopts shifting deposit unit U1, and the serial input terminal (DSL, DSR) that moves to left or move to right of this shifting deposit unit U1 is connected with the output of described upper voltage limit comparator A1 or lower voltage limit comparator A2; The output of described upper voltage limit comparator A1, lower voltage limit comparator A2 is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal CP1 should be accessed with the second input of door, to be describedly connected with the shift pulse input (CP) of shifting deposit unit U1 with the output of door; The output (Q0, Q1, Q2, Q3) of described shifting deposit unit U1 is connected with the control end of each constant-current source control unit respectively.
Embodiment 2
As shown in Fig. 1 to Fig. 2, embodiment 1 basis provides a kind of control method of constant-current source predrive circuit, wherein, described constant-current source predrive circuit comprises: several constant-current source control units, constant-current source voltage detection unit, logic control element in parallel with each LED module group respectively.
Described control method comprises:
Constant-current source voltage detection unit gathers the output voltage of series LED module group, and compares with the upper limit reference voltage VREF1 preset or lower limit reference voltage VREF2 according to output voltage Uo, to obtain the control signal of shutoff or conducting constant-current source control unit; Logic control element controls constant-current source control unit according to described control signal and turns off or conducting, lights to make corresponding LED module group or extinguishes.
Described constant-current source voltage detection unit comprises: upper voltage limit comparator A1, lower voltage limit comparator A2, and described output voltage Uo is connected to the end of oppisite phase of described upper voltage limit comparator A1 and the in-phase end of lower voltage limit comparator A2 respectively; The in-phase end of described upper voltage limit comparator A1 accesses described upper limit reference voltage VREF1, and the end of oppisite phase of described lower voltage limit comparator A2 accesses described lower limit reference voltage VREF2.
If described output voltage Uo is greater than upper limit reference voltage VREF1, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal turned off for constant-current source control unit.
If described output voltage Uo is less than lower limit reference voltage VREF2, described constant-current source voltage detection unit then exports the control signal being suitable for making logic control element generation for the conducting of constant-current source control unit.
If described output voltage Uo is between described upper limit reference voltage VREF1 and lower limit reference voltage VREF2, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal maintained the original state for constant-current source control unit.
Described logic control element adopts shifting deposit unit U1, and the serial input terminal (DSL, DSR) that moves to left or move to right of this shifting deposit unit U1 is connected with the output of described upper voltage limit comparator A1 or lower voltage limit comparator A2.In Fig. 2, output and the shifting deposit unit U1 of the described upper voltage limit comparator A1 serial input terminal (DSR) that moves to right is connected.
The output of described upper voltage limit comparator A1, lower voltage limit comparator A2 is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door, pulse signal CP1 should be accessed with the second input of door, describedly be connected with the shift pulse input (CP) of described shifting deposit unit U1 with the output of door, the output of described shifting deposit unit U1 is connected with the control end of each constant-current source control unit respectively.
Specific works method comprises:
The magnitude of voltage that the input voltage Ui that described input rated voltage is constant-current source predrive circuit gets, namely the output voltage Uo after several LED module groups of described rated voltage access series connection is a standard voltage value, under this standard voltage value, constant-current source predrive circuit breaker in middle pipe or LED driving chip operating state are desirable, namely caloric value is lower, when there is fluctuation in input voltage Ui, described upper limit reference voltage VREF1, lower limit reference voltage VREF2 limits the excursion of output voltage Uo, such as its be defined as output voltage Uo ± 10% or ± 5%.
If described LED module group is four, and control respectively by four constant-current source control units, the control end of each constant-current source control unit is connected, during startup with the output of described shifting deposit unit U1 respectively, constant-current source control unit acquiescence turns off, as shown in table 1.
Counterlogic table when table 1 constant-current source voltage detection unit and shifting deposit unit U1 start
In table 1, because upper voltage limit comparator A1, lower voltage limit comparator A2 are in open loop situations respectively, therefore, its output signal is high level and low level, and represent with 1 and 0 respectively, the state 1 of LED module group is expressed as to be lighted, and 0 is expressed as extinguishing.
As shown in table 1, initial described LED module group is entirely bright, if output voltage Uo is lower than lower limit reference voltage VREF2, described shifting deposit unit U1 moves to left " 1 ", extinguishes a LED module group, to improve output voltage Uo, and again judge whether this output voltage Uo is still less than lower limit reference voltage VREF2, if be less than, then repeats above-mentioned steps, until VREF2 < Uo < VREF1, export maintenance 0011 and export.
During startup, if the conducting of constant-current source control unit acquiescence, then working method is similar to table 1, namely compares from Uo > VREF1.
Or, also initial value can be obtained by preset mode, namely set described shifting deposit unit U1 and the series LED module group preset signal corresponding when input rated voltage, close to control a part of constant-current source control unit, another part constant-current source control unit disconnects, the step of preset signal comprises: work method control end M0 and M1 of described shifting deposit unit U1 accesses high level respectively, digital modeling is put to make described shifting deposit unit enter, such as, if described LED module group is four, and control respectively by four constant-current source control units, the control end that each constant-current source control unit controls is connected with the output of described shifting deposit unit U1 respectively, by putting number, insert 0011, namely in described four constant-current source control units, two shutoffs, another two conductings, corresponding LED module group, light for two, another two extinguishings, specific works process is see table 2, and when the described shifting deposit unit U1 supposing in this table 2 exports 0011, switching tube 1 processes desirable operating state, and now, the fluctuation due to input voltage Ui causes output voltage Uo that the course of work of respective change occurs.
Table 2 constant-current source voltage detection unit and shifting deposit unit U1 work-based logic table
Table 2 shows after preset 0011, if Uo > is VREF1, then controls shifting deposit unit U1 and move to right, to reduce output voltage, after making to meet VREF2 < Uo < VREF1, corresponding LED module group state keeps.In table 1, because upper voltage limit comparator A1, lower voltage limit comparator A2 are in open loop situations respectively; Therefore, its output signal is high level and low level, and represent with 1 and 0 respectively, the state 1 of LED module group is expressed as to be lighted, and 0 is expressed as extinguishing.
Specific works process is as follows: when the input voltage fluctuation of series LED module group.
As table 2, if described output voltage Uo is greater than upper limit reference voltage VREF1, described upper voltage limit comparator A1 output low level, lower voltage limit comparator A2 exports high level, and control described and door output pulse signal, and make described shifting deposit unit U1 export the shift signal that constant-current source control unit is turned off successively, control corresponding LED module group and light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage.
Equally, if described output voltage Uo is less than lower limit reference voltage VREF2, described upper voltage limit comparator A1 exports high level, lower voltage limit comparator A2 output low level, and control described and door output pulse signal, and make described shifting deposit unit U1 export the shift signal making the conducting of constant-current source control unit successively, control corresponding LED module group and extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage.
If described output voltage Uo is between described upper limit reference voltage VREF1 and lower limit reference voltage VREF2, described upper voltage limit comparator A1, lower voltage limit comparator A2 all export high level, and control described and door output low level, to turn off pulse signal CP1, described shifting deposit unit U1 is exported and maintains the original state, namely each LED module group maintains the original state, as shown in table 2, exporting with door cannot output pulse signal CP1, and therefore, shifting deposit unit exports and maintains the original state.
On the basis of technique scheme, those skilled in the art can be realized lower voltage limit comparator A2 according to the technical program and are connected with the serial input terminal that moves to left (DSL) of shifting deposit unit U1 by a not gate, both technical schemes are similar, discuss no longer in detail here.
Regulated by constant-current source, effectively can prevent switching tube or LED driving chip overtension, avoid switching tube or LED driving chip to burn out because temperature is too high.
In order to realize controlling N LED module group, the mode of several shifting deposit unit cascades can be adopted realize.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims purport of the present invention
In the whole change contained in the equivalents falling into claims scope and border or this scope and border and modification.

Claims (6)

1. a constant-current source predrive circuit, is characterized in that comprising:
Some constant-current source control units, it is in parallel with each LED module group respectively;
Constant-current source voltage detection unit, for gathering the output voltage of series LED module group, and according to this output voltage and upper limit reference voltage or lower limit reference voltage compare, to obtain the control signal of shutoff or conducting constant-current source control unit;
Logic control element, turning off or conducting for controlling constant-current source control unit according to described control signal, lighting to make corresponding LED module group or extinguishing.
2. according to the constant-current source predrive circuit described in claim 1, it is characterized in that, described constant-current source voltage detection unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively;
The in-phase end access upper limit reference voltage of described upper voltage limit comparator,
The end of oppisite phase access lower limit reference voltage of described lower voltage limit comparator.
3. according to the constant-current source predrive circuit described in claim 2, it is characterized in that, described logic control element adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator;
The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of shifting deposit unit with the output of door;
The output of described shifting deposit unit is connected with the control end of each constant-current source control unit respectively.
4. a control method for constant-current source predrive circuit, is characterized in that,
Described constant-current source predrive circuit comprises: several constant-current source control units, constant-current source voltage detection unit, logic control element in parallel with each LED module group respectively;
Described control method comprises:
Constant-current source voltage detection unit gathers the output voltage of series LED module group, and according to output voltage and the upper limit reference voltage preset or lower limit reference voltage compare, to obtain the control signal of shutoff or conducting constant-current source control unit;
Logic control element controls constant-current source control unit according to described control signal and turns off or conducting, lights to make corresponding LED module group or extinguishes.
5. according to the control method of the constant-current source predrive circuit described in claim 4, it is characterized in that, described constant-current source voltage detection unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to the end of oppisite phase of described upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively;
The in-phase end of described upper voltage limit comparator accesses described upper limit reference voltage,
The end of oppisite phase of described lower voltage limit comparator accesses described lower limit reference voltage;
If described output voltage is greater than upper limit reference voltage, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal turned off for constant-current source control unit;
If described output voltage is less than lower limit reference voltage, described constant-current source voltage detection unit then exports the control signal being suitable for making logic control element generation for the conducting of constant-current source control unit;
If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described constant-current source voltage detection unit then exports and is suitable for making logic control element produce the control signal maintained the original state for constant-current source control unit.
6. according to the control method of the constant-current source predrive circuit described in claim 5, it is characterized in that, described logic control element adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator;
The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of described shifting deposit unit with the output of door;
The output of described shifting deposit unit is connected with the control end of each constant-current source control unit respectively;
When the input voltage fluctuation of series LED module group;
If described output voltage is greater than upper limit reference voltage, described upper voltage limit comparator output low level, lower voltage limit comparator exports high level, and control described and door output pulse signal, and make described shifting deposit unit export the shift signal that constant-current source control unit is turned off successively, control corresponding LED module group to light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage;
If described output voltage is less than lower limit reference voltage, described upper voltage limit comparator exports high level, lower voltage limit comparator output low level, and control described and door output pulse signal, and make described shifting deposit unit export the shift signal making the conducting of constant-current source control unit successively, control corresponding LED module group to extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage;
If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described upper voltage limit comparator, lower voltage limit comparator all export high level, and control described and door output low level, and the output of described shifting deposit unit is maintained the original state, namely each LED module group maintains the original state.
CN201510339540.7A 2015-06-18 2015-06-18 Constant flow source predrive circuit and control method thereof Pending CN104918384A (en)

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CN108710077A (en) * 2018-08-07 2018-10-26 中科芯集成电路股份有限公司 A kind of electronic device of test circuit break-make

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Application publication date: 20150916