CN107911021A - Power management integrated circuit, liquid crystal panel and the control method using the circuit - Google Patents
Power management integrated circuit, liquid crystal panel and the control method using the circuit Download PDFInfo
- Publication number
- CN107911021A CN107911021A CN201711256999.6A CN201711256999A CN107911021A CN 107911021 A CN107911021 A CN 107911021A CN 201711256999 A CN201711256999 A CN 201711256999A CN 107911021 A CN107911021 A CN 107911021A
- Authority
- CN
- China
- Prior art keywords
- integrated circuit
- power management
- resistor
- management integrated
- field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Liquid Crystal Display Device Control (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of power management integrated circuit, it is electrically connected with a source electrode drive circuit；The power management integrated circuit is used for the input for receiving one first input voltage, and produces one second input voltage and input to the source electrode drive circuit, wherein the power management integrated circuit is electrically connected to the source electrode drive circuit by a diode；The power management integrated circuit includes：One boost pressure controller, a comparator, a first resistor, a field-effect tube and a proportion current source；The proportion current source is used to flow through the electric current of the field-effect tube and flows through the electric current of first resistor into the reduction of a proportionality coefficient.The circuit efficiently controls the electric current flowed through in first resistor by way of setting a proportion current source, to reduce the power consumption in first resistor, so as to correspondingly reduce the power consumption of power management integrated circuit, so that the temperature of power management integrated circuit correspondingly reduces, to reach the effect for the service life for extending product.
Description
Technical field
The present invention relates to liquid panel technique field, more particularly to a kind of power management integrated circuit, liquid crystal panel and adopt
With the control method of the power management integrated circuit.
Background technology
More and more ripe with the technology of TFT-LCD, the size of liquid crystal display panel is also progressively becoming larger, LCD display
The resolution ratio of plate is also higher and higher, therefore the power consumption of corresponding liquid crystal display panel increases therewith, so be easy to cause liquid crystal
Show that the Integrated Circuit Temperature in panel correspondingly increases.
As shown in Figure 1, power management integrated circuit (Power Management integrated circuit, referred to as
PMIC, it is a kind of integrated circuit of special-purpose, and makees the work such as management power supply for main system), it is defeated that it receives one first
Enter the input of voltage, and be electrically connected to the source electrode drive circuit outside one, while to input to the source electrode drive circuit
The the second input voltage supply voltage of source electrode drive circuit (or for) protected.It is used to reflect the second input by detecting
Electric current (detecting the electric current on first resistor R1) on the field-effect tube Q1 of voltage (the input point A in Fig. 1) is realized to source
The overcurrent protection (over current protection) of pole drive circuit.Wherein, power management integrated circuit 110 includes：
One boost pressure controller 111, a comparator 112, a first resistor R1 and a field-effect tube Q1；The boost pressure controller 111 it is defeated
Enter the output terminal that end is electrically connected to the comparator 112, the output terminal of the boost pressure controller 111 is electrically connected to the field
The grid of effect pipe Q1；The first input end of the comparator 112 be respectively and electrically connected to the field-effect tube Q1 source electrode and
One end of first resistor R1, the second input terminal of the comparator 112 is receiving the input of a reference voltage VREF；Described
The other end ground connection of one resistance R1；The drain electrode of the field-effect tube Q1 is electrically connected to the source drive electricity via diode D1
Road.
However, being continuously increased with the resolution ratio of liquid crystal display panel, it can be used in the field for reflecting second input voltage
Electric current on effect pipe Q1 is also increasing, that is, the electric current flowed through on first resistor R1 is also increasing, in this way, the first electricity
Power consumption on resistance R1 also correspondingly increases, so as to cause the temperature of power management integrated circuit also higher and higher.
Therefore, it is urgent to provide a kind of power management integrated circuit, to solve the above problems.
The content of the invention
It is an object of the present invention to provide a kind of power management integrated circuit, its side by setting a proportion current source
Formula efficiently controls the electric current flowed through in first resistor, to reduce the power consumption in first resistor, so as to correspondingly reduce power supply
Manage the power consumption of integrated circuit so that the temperature of power management integrated circuit correspondingly reduces, to reach the use for extending product
The effect in service life.
To achieve these goals, the present invention provides a kind of power management integrated circuit, the power management to integrate electricity
Source electrode drive circuit outside Lu Yuyi is electrically connected；The power management integrated circuit is used to receive one first input voltage
Input, and one second input voltage is produced, to input to the source electrode drive circuit, wherein the power management integrated circuit leads to
Cross a diode and be electrically connected to the source electrode drive circuit；The power management integrated circuit includes：One boost pressure controller, one
Comparator, a first resistor, a field-effect tube and a proportion current source；The proportion current source is used to flow through the field effect
Should pipe electric current and flow through the electric current of first resistor into the reduction of a proportionality coefficient；The input terminal of the boost pressure controller electrically connects
The output terminal of the comparator is connected to, the output terminal of the boost pressure controller is respectively and electrically connected to the grid of the field-effect tube
And the input terminal of the proportion current source；The first input end of the comparator is respectively and electrically connected to the one of the first resistor
End and the output terminal of the proportion current source, the second input terminal of the comparator are used for the input for receiving a reference voltage；
The other end ground connection of the first resistor；The drain electrode of the field-effect tube is electrically connected the anode of the diode, the field effect
Should pipe source electrode ground connection.
In one embodiment of this invention, the electric current that the proportion current source is used to flow through the first resistor is with flowing through
The proportionality coefficient of the ratio between the electric current of the field-effect tube is arranged to 1/100.
In one embodiment of this invention, when short circuit occurs for the source electrode drive circuit, the electricity of the diode is flowed through
Rheology is big, and the voltage of one end of first resistor also correspondingly becomes larger；When the voltage of described one end of the first resistor is more than institute
When stating reference voltage, the boost pressure controller causes field-effect tube to be in cut-off state, and proportion current source is stopped.
In one embodiment of this invention, the cathode of the diode is electrically connected to one end of a capacitance, the capacitance
The other end ground connection.
In addition, the present invention also provides a kind of liquid crystal panel, it includes above-mentioned power management integrated circuit.
In addition, the present invention also provides a kind of control method using above-mentioned power management integrated circuit, it includes following step
Suddenly：(a) it is conducting state to pre-set a field-effect tube；(b) proportion current source is set, so that flowing through the electricity of field-effect tube
Flow and flow through the electric current of first resistor into the reduction of a proportionality coefficient；(c) voltage of one end of first resistor is detected, when flowing through
When stating the electric current of diode and becoming larger, the voltage of one end of the first resistor also correspondingly becomes larger；(d) comparator is set so that
The voltage of described one end of the first resistor is compared with reference voltage；(e) boost pressure controller is set, when the described first electricity
When the voltage of described one end of resistance is more than the reference voltage, the boost pressure controller causes field-effect tube to be in cut-off state,
And proportion current source is set to be stopped.
It is an advantage of the current invention that the present invention power management integrated circuit by way of a proportion current source is set come
The electric current flowed through in first resistor is efficiently controlled, to reduce the power consumption in first resistor, so as to correspondingly reduce power management
The power consumption of integrated circuit so that the temperature of power management integrated circuit correspondingly reduces, to reach the use for extending whole product
The effect in service life.
Brief description of the drawings
Fig. 1 is the circuit connection diagram of the power management integrated circuit of the prior art.
Fig. 2 is the circuit connection diagram of the power management integrated circuit of one embodiment of the invention.
Fig. 3 is the step flow chart of the control method using power management integrated circuit of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawings to power management integrated circuit provided by the invention, liquid crystal panel and using the power management collection
Embodiment into the control method of circuit elaborates.
It is shown in Figure 2, the present invention relates to a kind of power management integrated circuit, the power management integrated circuit 110 with
Source electrode drive circuit 120 (or being column drive circuit) outside one is electrically connected；The power management integrated circuit 110 is used for
The input of one first input voltage (such as+12V voltages) is received, and produces one second input voltage (input point as shown in Figure 2
A, it is+15V voltages), to input to the source electrode drive circuit 120, wherein the power management integrated circuit 110 passes through one
Diode D1 is electrically connected to the source electrode drive circuit 120.
In embodiment of the present invention, first input voltage is electrically connected to the power supply pipe by an inductance L1
Manage integrated circuit 110.The inductance L1 is used to be filtered the first input voltage.In addition, the cathode electricity of the diode D1
Property be connected to one end of a capacitance C1, the other end ground connection of the capacitance C1.The capacitance C1 is used to play the second input voltage
To pressure stabilization function.
The power management integrated circuit 110 includes：One boost pressure controller 111, a comparator 112, a first resistor R1,
One field-effect tube Q1 and a proportion current source 113.The proportion current source 113 is used for the electric current for flowing through the field-effect tube Q1
With flowing through the electric current of first resistor R1 into the reduction of a proportionality coefficient.The input terminal of the boost pressure controller 111 is electrically connected to
The output terminal of the comparator 112, the output terminal of the boost pressure controller 111 are respectively and electrically connected to the field-effect tube Q1's
The input terminal of grid and the proportion current source 113；The first input end ("+" in such as Fig. 2) of the comparator 112 is electric respectively
Property is connected to one end of the first resistor R1 and the output terminal of the proportion current source 113, and the second of the comparator 112
Input terminal ("-" in such as Fig. 2) is used to receive a reference voltage VREFInput；The other end ground connection of the first resistor R1；Institute
The drain electrode for stating field-effect tube Q1 is electrically connected to the anode of the diode D1, the source electrode ground connection of the field-effect tube Q1.
In the present embodiment, the proportion current source 113 is used to flow through the electric current of the first resistor R1 and flows through institute
The proportionality coefficient for stating the ratio between the electric current of field-effect tube Q1 is arranged to 1/100.That is, normal work when, by using than
Example current source 113 so that the electric current of first resistor R1 is flowed through in the embodiment of the present invention than being flowed through in the embodiment of the prior art
The electric current of first resistor R1 is relatively reduced.For example, if the electric current for flowing through field-effect tube Q1 in the embodiment of the prior art is
100 milliamperes, the electric current for simultaneously flowing through first resistor R1 is 100 milliamperes, then in embodiment of the present invention, flows through field-effect tube
The electric current of Q1 is 100 milliamperes, but the electric current for flowing through first resistor R1 is 1 milliampere, in this way, according to circuit theory, the first electricity
The power consumption for hindering R1 is P=I*I*R, and due to the electric current I on first resistor R1, embodiment diminishes compared with the prior art, first
Power consumption P on resistance R1 also correspondingly reduces, in this way, the loss heat of first resistor R1 lowers significantly, so as to normal
The temperature of power management integrated circuit 110 is reduced during work, and extends the service life of whole product.
(as described in the flowing through first resistor R1 it is noted that the output current of the proportion current source 113 and input current
Electric current and flow through the electric current of the field-effect tube Q1) the ratio between proportionality coefficient can also be other values, it can be according to scene
It is actually needed and sets.In addition, it is noted that reference voltage V in the embodiment of the present inventionREFWith the embodiment of the prior art
In reference voltage VREFDifference is usually according to the electric current for flowing through the first resistor R1 and flows through the field-effect tube Q1's
The ratio between electric current and correspondingly adjust.
In addition, in embodiment of the present invention, the electric current of field-effect tube Q1 is flowed through with the electric current for flowing through diode D1
Size and change.That is, the size of current for flowing through field-effect tube Q1 can reflect the second input voltage (i.e. source drive
The supply voltage of circuit) size.
When short circuit occurs for the source electrode drive circuit, the electric current for flowing through the diode D1 becomes larger, first resistor R1's
The voltage of one end becomes larger.When the voltage of described one end of the first resistor R1 is more than the reference voltage VREFWhen, the boosting
Controller 111 exports a signal so that the modules in the power management integrated circuit 110 are stopped, including cause
Field-effect tube Q1 is in cut-off state, and proportion current source 113 is stopped, and will not produce the second input voltage extremely
Source electrode drive circuit 120.
In addition, the present invention also provides a kind of liquid crystal panel (not shown), it includes power management described above and integrates electricity
Road 110.Since various components connection relation and the effect of the power management integrated circuit 110 being described in detail above,
Therefore, repeat no more here.
Referring to Fig. 3, in addition, the present invention also provides a kind of control method of above-mentioned power management integrated circuit, it include with
Lower step：
Step S310：It is conducting state to pre-set a field-effect tube.
Step S320：One proportion current source is set, so that flowing through the electric current of field-effect tube and flowing through the electricity of first resistor
Flow into the reduction of a proportionality coefficient.
Step S330：The voltage of one end of first resistor is detected, when the electric current for flowing through the diode becomes larger, described the
The voltage of one end of one resistance also correspondingly becomes larger.
Step S340：Comparator is set so that the voltage of described one end of the first resistor is compared with reference voltage
Compared with.
Step S350：Boost pressure controller is set, when the voltage of described one end of the first resistor is more than the reference electricity
During pressure, the boost pressure controller causes field-effect tube to be in cut-off state, and proportion current source is stopped.
By in power management integrated circuit 110 by setting the implementation of a proportion current source 113 and above-mentioned steps,
To efficiently control the electric current flowed through on first resistor R1, to reduce the power consumption on first resistor R1, so as to correspondingly reduce electricity
The power consumption of source control integrated circuit 110 so that the temperature of power management integrated circuit 110 correspondingly reduces, whole to reach extension
The effect of the service life of a product.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
1. a kind of power management integrated circuit, the source electrode drive circuit outside the power management integrated circuit and one electrically connects
Connect；The power management integrated circuit is used for the input for receiving one first input voltage, and produces one second input voltage, with defeated
Enter to the source electrode drive circuit, driven wherein the power management integrated circuit is electrically connected to the source electrode by a diode
Dynamic circuit；It is characterized in that, the power management integrated circuit includes：One boost pressure controller, a comparator, a first resistor,
One field-effect tube and a proportion current source；The proportion current source is used to flowing through the electric current of the field-effect tube and flows through the
Reduction of the electric current of one resistance into a proportionality coefficient；The input terminal of the boost pressure controller is electrically connected to the defeated of the comparator
Outlet, the output terminal of the boost pressure controller are respectively and electrically connected to the grid of the field-effect tube and the proportion current source
Input terminal；The first input end of the comparator is respectively and electrically connected to one end of the first resistor and the proportional current
The output terminal in source, the second input terminal of the comparator are used for the input for receiving a reference voltage；The first resistor it is another
End ground connection；The drain electrode of the field-effect tube is electrically connected the anode of the diode, the source electrode ground connection of the field-effect tube.
2. power management integrated circuit according to claim 1, it is characterised in that the proportion current source is used to flow through
The electric current of the first resistor is arranged to 1/100 with flowing through the proportionality coefficient of the ratio between the electric current of the field-effect tube.
3. power management integrated circuit according to claim 1, it is characterised in that when source electrode drive circuit generation is short
Lu Shi, the electric current for flowing through the diode become larger, and the voltage of one end of first resistor also correspondingly becomes larger；When the first resistor
The voltage of described one end when being more than the reference voltage, the boost pressure controller causes field-effect tube to be in cut-off state, and
And proportion current source is set to be stopped.
4. power management integrated circuit according to claim 1, it is characterised in that the cathode of the diode is electrically connected
To one end of a capacitance, the other end ground connection of the capacitance.
5. a kind of liquid crystal panel, it is characterised in that including any power management integrated circuit in Claims 1-4.
6. a kind of control method using power management integrated circuit described in claim 1, it is characterised in that including following step
Suddenly：
(a) it is conducting state to pre-set a field-effect tube；
(b) proportion current source is set, so that flowing through the electric current of field-effect tube and flowing through the electric current of first resistor into a ratio
The reduction of coefficient；
(c) voltage of one end of first resistor, when the electric current for flowing through the diode becomes larger, the one of the first resistor are detected
The voltage at end also correspondingly becomes larger；
(d) comparator is set so that the voltage of described one end of the first resistor is compared with reference voltage；
(e) boost pressure controller, when the voltage of described one end of the first resistor is more than the reference voltage, the liter are set
Pressure controller causes field-effect tube to be in cut-off state, and proportion current source is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256999.6A CN107911021A (en) | 2017-12-04 | 2017-12-04 | Power management integrated circuit, liquid crystal panel and the control method using the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711256999.6A CN107911021A (en) | 2017-12-04 | 2017-12-04 | Power management integrated circuit, liquid crystal panel and the control method using the circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107911021A true CN107911021A (en) | 2018-04-13 |
Family
ID=61853920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711256999.6A Pending CN107911021A (en) | 2017-12-04 | 2017-12-04 | Power management integrated circuit, liquid crystal panel and the control method using the circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107911021A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108399905A (en) * | 2018-05-03 | 2018-08-14 | 深圳市华星光电技术有限公司 | Display driver circuit and display drive method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201159746Y (en) * | 2008-02-03 | 2008-12-03 | 深圳艾科创新微电子有限公司 | Current detection circuit |
| CN101567630A (en) * | 2009-05-27 | 2009-10-28 | 东南大学 | Inductive current induction circuit |
| CN106575921A (en) * | 2014-06-23 | 2017-04-19 | 微芯片科技公司 | Circuit and method for active crosstalk reduction in multiple-channel power supply controllers |
-
2017
- 2017-12-04 CN CN201711256999.6A patent/CN107911021A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201159746Y (en) * | 2008-02-03 | 2008-12-03 | 深圳艾科创新微电子有限公司 | Current detection circuit |
| CN101567630A (en) * | 2009-05-27 | 2009-10-28 | 东南大学 | Inductive current induction circuit |
| CN106575921A (en) * | 2014-06-23 | 2017-04-19 | 微芯片科技公司 | Circuit and method for active crosstalk reduction in multiple-channel power supply controllers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108399905A (en) * | 2018-05-03 | 2018-08-14 | 深圳市华星光电技术有限公司 | Display driver circuit and display drive method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202310187U (en) | Driving circuit of luminous element, luminous device using same, and electronic equipment | |
| CN103595018B (en) | Over-voltage protecting circuit, LED backlight drive circuit and liquid crystal displayer | |
| CN103440848B (en) | Backlight drive circuit | |
| CN107623968B (en) | Line voltage compensation circuit, LED driving system and driving method | |
| CN103606884A (en) | Over-current protection circuit, LED backlight drive circuit and liquid crystal display | |
| CN104699153B (en) | Low-dropout linear regulator | |
| CN103177698A (en) | Light-emitting diode (LED) backlight driving circuit and backlight module | |
| CN102243850A (en) | Backlight source driving circuit and driving circuit thereof as well as liquid crystal television | |
| US8912731B2 (en) | LED backlight driving circuit and backlight module | |
| CN105186859B (en) | Switching converter and method for discharging output terminal thereof | |
| CN103219893B (en) | Switch power controller and switching power circuit | |
| CN203895095U (en) | Backlight power supply circuit of display screen | |
| CN105187749A (en) | Television backlight driving device and driving method thereof | |
| CN103531156A (en) | Backlight driving circuit and liquid crystal display device | |
| CN104302053A (en) | LED constant current source output detection control circuit and control method thereof | |
| CN108882450A (en) | The limiting circuit and constant current LED power supplies circuit of constant current LED power supplies maximum power output | |
| CN104167186B (en) | LED backlight and liquid crystal display for liquid crystal display | |
| US8710803B2 (en) | Charging current control method and charging system | |
| KR100869807B1 (en) | Power Factor Corrector | |
| CN107911021A (en) | Power management integrated circuit, liquid crystal panel and the control method using the circuit | |
| CN207601159U (en) | A kind of current detection circuit and switching circuit | |
| CN207304400U (en) | A kind of driving power | |
| CN103151000B (en) | Backlight driving circuit and driving method thereof and liquid crystal display device | |
| US9750101B2 (en) | Voltage boost driving circuit for led backlight and LCD device having same | |
| CN203840596U (en) | Ripple current suppression circuit and LED circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180413 |