CN202713737U - LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage - Google Patents
LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage Download PDFInfo
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- CN202713737U CN202713737U CN 201220385292 CN201220385292U CN202713737U CN 202713737 U CN202713737 U CN 202713737U CN 201220385292 CN201220385292 CN 201220385292 CN 201220385292 U CN201220385292 U CN 201220385292U CN 202713737 U CN202713737 U CN 202713737U
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Abstract
The utility model relates to an LED (Light Emitting Diode) driving circuit capable of regulating the current balance by a negative voltage. The LED driving circuit comprises a fly-back circuit, a voltage regulation converter, an LED light bar and a current mirror equalizing circuit; the fly-back circuit comprises two power supply output ends; a first power supply output end is provided to an LED; a second power supply output end is provided to the voltage regulation converter; the negative voltage is generated by the voltage regulation converter and the voltage regulation converter is connected with the current mirror equalizing circuit; and the current mirror equalizing circuit is connected with the LED. According to the utility model, with the above structure, the LED light bar is driven by the negative voltage generated by the voltage regulation converter and a high voltage output by the fly-back circuit. The LED light bar is directly driven by the high voltage output by the fly-back circuit without another stage of DC (Direct Current) to DC process, so that the efficiency is greatly improved. The low negative voltage is generated by the voltage regulation converter so as to provide a constant current regulating effect. Due to the low negative voltage generated by the voltage regulation converter, a device with a low withstand voltage and a low rated current can be selected and the cost is saved.
Description
Technical field
The utility model relates to the led drive circuit that a kind of negative voltage is regulated current balance type.
Background technology
The LED of liquid crystal display uses the lamp bar that usually several LED is unified into array at present, and voltage that therefore need to be higher could driving LED lamp bar.Yet in existing LED lamp bar drive circuit, circuit framework figure such as Fig. 1 demonstration, mostly be to use first the voltage of structure output 12V of reverse excitation circuit to the T-CON chip power supply of liquid crystal panel, this supply power voltage also passes through one-level BOOST converter boost simultaneously, voltage is raised to than the slightly high voltage in LED lamp bar two ends from 12V, and access respectively the input of each LED lamp bar, be the power supply of LED lamp bar; Another input of each LED lamp bar connects current mirror source an ancient unit of weight current circuit.
Along with the size of present liquid crystal display is increasing, the LED lamp bar of its demand is more and more, need simultaneously the operating voltage at LED two ends also to become higher, reach volt more than 100, and all get for the energy of LED lamp bar power supply from the 12V low-voltage through the BOOST converter boost.And this BOOST converter can increase loss, makes Efficiency Decreasing.The power field effect transistor of this BOOST converter and power crystal diode all need to select higher withstand voltage device, and cost is higher.
Summary of the invention
The purpose of this utility model is to improve the efficient that the liquid crystal display LED-backlit drives, thereby reduces cost.
The utility model adopts following circuit framework, and a kind of negative voltage is regulated the led drive circuit of current balance type, and it comprises reverse excitation circuit, pressure-adjusting type converter, LED lamp bar, current mirror an ancient unit of weight current circuit; Described reverse excitation circuit comprises the first power output end, second source output, and the first power output end of described reverse excitation circuit connects respectively the first input end of LED lamp bar; The second source output of described reverse excitation circuit connects the first input end of pressure-adjusting type converter, and produces a negative voltage; Described pressure-adjusting type converter also comprises the negative voltage output, the first output, the second output, the 3rd output, the second input, described negative voltage output connects the negative voltage input of current mirror an ancient unit of weight current circuit, the first output of described pressure-adjusting type converter connects the first input end of current mirror an ancient unit of weight current circuit, the second output of described pressure-adjusting type converter connects the second input of current mirror an ancient unit of weight current circuit, the 3rd output of described pressure-adjusting type converter connects the 3rd input of current mirror an ancient unit of weight current circuit, and the second input of described pressure-adjusting type converter connects the first output of current mirror an ancient unit of weight current circuit; The second output of described current source an ancient unit of weight current circuit connects the second input of LED lamp bar.
The first power output end connection transformer first output of described reverse excitation circuit, first crystal diode, the first filter capacitor, the first output of described transformer connects the positive pole of first crystal diode, the negative pole of described first crystal diode connects the positive pole of the first filter capacitor, described the first filter capacitor minus earth; Second source output connection transformer second output of described reverse excitation circuit, the second crystal diode, the second filter capacitor, the second output of described transformer connects the positive pole of the second crystal diode, the negative pole of described the second crystal diode connects the positive pole of the second filter capacitor, described the second filter capacitor minus earth.
Described pressure-adjusting type converter comprises p type field effect transistor, power crystal diode, inductance, the 3rd filter capacitor and Pwm controller; The source electrode of described p type field effect transistor is connected to the positive pole of the second filter capacitor, the drain electrode of p type field effect transistor is connected respectively to the negative pole of power crystal diode and an end of inductance, the other end ground connection of described inductance, the positive pole of described power crystal diode is connected to the negative pole of the 3rd filter capacitor, the plus earth of described the 3rd filter capacitor, the grid of p type field effect transistor are connected to the grid drive end of Pwm controller; The 3rd output of described pressure-adjusting type converter connects the first input end of described pressure-adjusting type converter.
Described current mirror an ancient unit of weight current circuit comprises current source and driven with current sources circuit, and described current source and driven with current sources circuit are connected in series, and described current source is connected with each LED lamp bar respectively.
Described current source comprises the second transistor, the 3rd transistor, the 4th transistor, the 5th transistor, the 6th transistor and the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance; The emitter of described the 6th transistor connects an end of the 5th resistance, and the other end of the 5th resistance connects the first output of pressure-adjusting type variator; The emitter of the second transistor is connected with the first resistance; The emitter of the 3rd transistor is connected with the second resistance; The emitter of the 4th transistor is connected with the 3rd resistance; The emitter of the 5th transistor is connected with the 4th resistance; Described the second transistor to the five transistor parallels connect, the first resistance to the five resistance are connected in parallel, the resistance of described the first resistance, the second resistance, the 3rd resistance, the 4th resistance is identical, and the negative voltage output of described pressure-adjusting type converter is connected to the 5th resistance.
Described driven with current sources circuit comprises the 7th transistor, the 6th resistance; The base stage of described the 7th transistor is connected to the comp end of the Pwm controller in the buck-boost converter circuit, the collector electrode of the 7th transistor (Q7) is connected to the 3rd output of the Pwm controller of buck-boost converter circuit, the emitter of the 7th transistor connects an end of the 6th resistance, and the other end of the 6th resistance connects collector electrode, base stage and the second transistor, the 3rd transistor, the 4th transistor of the 6th transistor of current source circuit, the base stage of the 5th transistor simultaneously.
Voltage between described the 5th resistance equals the inner reference voltage that compares with it of Pwm controller.
The second input of described LED lamp bar respectively with the collector electrode of the second transistor of current source circuit, the 3rd transistor, the 4th transistor, the 5th transistor.
The utility model adopts above structure, is applied in liquid crystal display or the LCD TV field, and the high voltage that utilizes lower negative voltage of pressure-adjusting type converter output and reverse excitation circuit structure output is driving LED lamp bar together.Only having the energy of negative voltage part is to obtain through the pressure-adjusting type converter from reverse excitation circuit second source output end voltage, therefore LED lamp bar is directly driven by the high voltage of reverse excitation circuit the first power supply output, do not need to pass through again one-level DC-DC converter, greatly improved efficient.Voltage differences between each LED lamp bar is little, so the voltage of required adjusting was little when the constant current of LED lamp bar was controlled.Utilize the pressure-adjusting type converter to produce a lower negative voltage and do the constant flow regulation effect, because the negative voltage of pressure-adjusting type converter output is lower, and be operated in the so far LED power supply in negative voltage interval of 0V only for LED lamp bar, so the pliotron of process pressure-adjusting type converter and voltage and the electric current of power diode are all lower, can select the withstand voltage low and lower device of rated current, save cost.
Description of drawings
Be that the utility model is described further below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit diagram of known LED drive unit;
Fig. 2 is the schematic diagram of the embodiment of a kind of negative voltage of the utility model led drive circuit of regulating current balance type.
Embodiment
As depicted in figs. 1 and 2, the utility model comprises reverse excitation circuit 1, pressure-adjusting type converter 2, LED lamp bar 3, current mirror an ancient unit of weight current circuit 4; Described reverse excitation circuit 1 comprises the first power output end, second source output, and the first power output end of described reverse excitation circuit 1 connects respectively the first input end of LED lamp bar 3; The second source output of described reverse excitation circuit 1 connects the first input end of pressure-adjusting type converter 2, and produces a negative voltage; Described pressure-adjusting type converter 2 also comprises the negative voltage output, the first output, the second output, the 3rd output, the second input, described negative voltage output connects the negative voltage input of current mirror an ancient unit of weight current circuit 4, the first output of described pressure-adjusting type converter 2 connects the first input end of current mirror an ancient unit of weight current circuit 4, the second output of described pressure-adjusting type converter 2 connects the second input of current mirror an ancient unit of weight current circuit 4, the 3rd output of described pressure-adjusting type converter 2 connects the 3rd input of current mirror an ancient unit of weight current circuit, and the second input of described pressure-adjusting type converter 2 connects the first output of current mirror an ancient unit of weight current circuit 4; The second output of described current source an ancient unit of weight current circuit 4 connects the second input of LED lamp bar 3.
The busbar voltage of external communication voltage after rectifying and wave-filtering and power factor (PF) calibration is Vbus, gives reverse excitation circuit 1 power supply.Two groups of voltages of transformer (T1) output, one group through first crystal diode (D10), and output 160V direct voltage behind the first filter capacitor (C2) rectifying and wave-filtering connects the first input end of LED lamp bar, is the power supply of LED lamp bar; Another group is through the second crystal diode (D11), and output 12V direct voltage behind the second filter capacitor (C3) rectifying and wave-filtering gives rear class pressure-adjusting type converter (BUCK-BOOST) 2 power supplies.The first power output end connection transformer (T1) first output of described reverse excitation circuit 1, first crystal diode (D10), the first filter capacitor (C2), the first output of described transformer (T1) connects the positive pole of first crystal diode (D10), the negative pole of described first crystal diode (D10) connects the positive pole of the first filter capacitor (C2), described the first filter capacitor (C2) minus earth; Second source output connection transformer (T1) second output of described reverse excitation circuit, the second crystal diode (D11), the second filter capacitor (C3), the second output of described transformer (T1) connects the positive pole of the second crystal diode (D11), the negative pole of described the second crystal diode (D11) connects the positive pole of the second filter capacitor (C3), described the second filter capacitor (C3) minus earth.
Described pressure-adjusting type converter 2 comprises p type field effect transistor (Q1), power crystal diode (D1), inductance (L1), the 3rd filter capacitor (C4) and pulse width modulation (PWM) controller 21; The source electrode of described P type power field effect transistor (Q1) is connected to the positive pole of the second filter capacitor (C3), the drain electrode of P type power field effect transistor (Q1) is connected respectively to the negative pole of power crystal diode (D1) and an end of inductance (L1), the other end ground connection of described inductance (L1), the positive pole of described power crystal diode (D1) is connected to the negative pole of the 3rd filter capacitor (C4), the plus earth of described the 3rd filter capacitor (C4), the grid of P type power field effect transistor (Q1) is connected to the grid drive end of Pwm controller; The 3rd output of described pressure-adjusting type converter 2 connects the first input end of described pressure-adjusting type converter.When p type field effect transistor (Q1) conducting, the 12V voltage of the second crystal diode (D11) output charges to inductance (L1) through the drain electrode of p type field effect transistor (Q1), when p type field effect transistor (Q1) ends, inductance (L1) is through p type field effect transistor (Q1), the 3rd filter capacitor (C4) afterflow, power diode (D1) conducting is charged to the 3rd filter capacitor (C4) simultaneously.The duty ratio of supposing p type field effect transistor (Q1) conducting is D, and then the voltage at the 3rd filter capacitor (C4) two ends is
I
LedNamely flow through the total current of LED lamp bar 3, I
Q6Namely flow through the average current of the 6th crystal diode, flow through the average current I of power diode (D1)
D1=I
Led-I
Q6Pulse width modulation (PWM) controller 21 is controlled duty ratio by the electric current that detects in current mirror an ancient unit of weight current circuit, makes the total current of LED lamp bar constant.
Described current mirror an ancient unit of weight current circuit comprises current source and driven with current sources circuit, and described current source and driven with current sources circuit are connected in series, and described current source is connected with each LED lamp bar 3 respectively.
Described current source comprises the second transistor (Q2), the 3rd transistor (Q3), the 4th transistor (Q4), the 5th transistor (Q5), the 6th transistor (Q6) and the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5); The emitter of described the 6th transistor (Q6) connects an end of the 5th resistance (R5), and the other end of the 5th resistance (R5) connects the first output of pressure-adjusting type converter 2; The emitter of the second transistor (Q2) is connected with the first resistance (R1); The emitter of the 3rd transistor (Q3) is connected with the second resistance (R2); The emitter of the 4th transistor (Q4) is connected with the 3rd resistance (R3); The emitter of the 5th transistor (Q5) is connected with the 4th resistance (R4); Described the second transistor (Q2) to the 5th transistor (Q5) is connected in parallel, the first resistance (R1) to the 5th resistance (R5) is connected in parallel, the resistance of described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) is identical, and the negative voltage output of described pressure-adjusting type converter 2 is connected to the 5th resistance (R5).I
Q2=I
Q3=I
Q4=I
Q5, flow through the average current of the 6th transistor (Q6)
And the voltage at the 5th resistance (R5) two ends equals pulse width modulation (PWM) the controller 21 inner reference voltage V ref that compare with it, so as long as set the resistance of the 5th resistance (R5), just can set the electric current of each LED lamp bar 3.
Described driven with current sources circuit comprises the 7th transistor (Q7), the 6th resistance (R6); The base stage of described the 7th transistor (Q7) is connected to the comp end of the Pwm controller in the buck-boost converter circuit, the collector electrode of the 7th transistor (Q7) is connected to the 3rd output (Vcc) of the Pwm controller of buck-boost converter circuit, the emitter of the 7th transistor (Q7) connects an end of the 6th resistance (R6), and the other end of the 6th resistance (R6) connects the collector electrode of the 6th transistor (Q6) of current source circuit simultaneously, base stage and the second transistor (Q2), the 3rd transistor (Q3), the 4th transistor (Q4), the base stage of the 5th transistor (Q5).
Voltage between described the 5th resistance (R5) equals the Pwm controller 21 inner reference voltages that compare with it.
The second input of described LED lamp bar 3 respectively with the collector electrode of second transistor (Q2) of current source circuit, the 3rd transistor (Q3), the 4th transistor (Q4), the 5th transistor (Q5).
Above embodiment is preferred implementation of the present utility model, and the personnel in relevant technologies field under the prerequisite that does not break away from the utility model principle, make some improvement, deduction or replace, and these improvement and replacement also are considered as protection range of the present utility model.
Claims (8)
1. a negative voltage is regulated the led drive circuit of current balance type, and it is characterized in that: it comprises reverse excitation circuit, pressure-adjusting type converter, LED lamp bar, current mirror an ancient unit of weight current circuit; Described reverse excitation circuit comprises the first power output end, second source output, and the first power output end of described reverse excitation circuit connects respectively the first input end of LED lamp bar; The second source output of described reverse excitation circuit connects the first input end of pressure-adjusting type converter, and produces a negative voltage; Described pressure-adjusting type converter also comprises the negative voltage output, the first output, the second output, the 3rd output, the second input, described negative voltage output connects the negative voltage input of current mirror an ancient unit of weight current circuit, the first output of described pressure-adjusting type converter connects the first input end of current mirror an ancient unit of weight current circuit, the second output of described pressure-adjusting type converter connects the second input of current mirror an ancient unit of weight current circuit, the 3rd output of described pressure-adjusting type converter connects the 3rd input of current mirror an ancient unit of weight current circuit, and the second input of described pressure-adjusting type converter connects the first output of current mirror an ancient unit of weight current circuit; The second output of described current source an ancient unit of weight current circuit connects the second input of LED lamp bar.
2. a kind of negative voltage according to claim 1 is regulated the led drive circuit of current balance type, it is characterized in that: the first power output end connection transformer (T1) first output of described reverse excitation circuit, first crystal diode (D10), the first filter capacitor (C2), the first output of described transformer (T1) connects the positive pole of first crystal diode (D10), the negative pole of described first crystal diode (D10) connects the positive pole of the first filter capacitor (C2), described the first filter capacitor (C2) minus earth; Second source output connection transformer (T1) second output of described reverse excitation circuit, the second crystal diode (D11), the second filter capacitor (C3), the second output of described transformer (T1) connects the positive pole of the second crystal diode (D11), the negative pole of described the second crystal diode (D11) connects the positive pole of the second filter capacitor (C3), described the second filter capacitor (C3) minus earth.
3. a kind of negative voltage according to claim 1 is regulated the led drive circuit of current balance type, and it is characterized in that: described pressure-adjusting type converter comprises p type field effect transistor (Q1), power crystal diode (D1), inductance (L1), the 3rd filter capacitor (C4) and Pwm controller; The source electrode of described p type field effect transistor (Q1) is connected to the positive pole of the second filter capacitor (C3), the drain electrode of p type field effect transistor (Q1) is connected respectively to the negative pole of power crystal diode (D1) and an end of inductance (L1), the other end ground connection of described inductance (L1), the positive pole of described power crystal diode (D1) is connected to the negative pole of the 3rd filter capacitor (C4), the plus earth of described the 3rd filter capacitor (C4), the grid of p type field effect transistor (Q1) is connected to the grid drive end of Pwm controller; The 3rd output of described pressure-adjusting type converter connects the first input end of described pressure-adjusting type converter.
4. a kind of negative voltage according to claim 1 is regulated the led drive circuit of current balance type, it is characterized in that: described current mirror an ancient unit of weight current circuit comprises current source and driven with current sources circuit, described current source and driven with current sources circuit are connected in series, and described current source is connected with each LED lamp bar respectively.
According to claim 1 or 4 described a kind of negative voltages regulate the led drive circuit of current balance types, it is characterized in that: described current source comprises the second transistor (Q2), the 3rd transistor (Q3), the 4th transistor (Q4), the 5th transistor (Q5), the 6th transistor (Q6) and the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5); The emitter of described the 6th transistor (Q6) connects an end of the 5th resistance (R5), and the other end of the 5th resistance (R5) connects the first output of pressure-adjusting type variator; The emitter of the second transistor (Q2) is connected with the first resistance (R1); The emitter of the 3rd transistor (Q3) is connected with the second resistance (R2); The emitter of the 4th transistor (Q4) is connected with the 3rd resistance (R3); The emitter of the 5th transistor (Q5) is connected with the 4th resistance (R4); Described the second transistor (Q2) to the 5th transistor (Q5) is connected in parallel, the first resistance (R1) to the 5th resistance (R5) is connected in parallel, the resistance of described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) is identical, and the negative voltage output of described pressure-adjusting type converter is connected to the 5th resistance (R5).
According to claim 1 or 4 described a kind of negative voltages regulate the led drive circuit of current balance types, it is characterized in that: described driven with current sources circuit comprises the 7th transistor (Q7), the 6th resistance (R6); The base stage of described the 7th transistor (Q7) is connected to the comp end of the Pwm controller in the buck-boost converter circuit, the collector electrode of the 7th transistor (Q7) is connected to the 3rd output (Vcc) of the Pwm controller of buck-boost converter circuit, the emitter of the 7th transistor (Q7) connects an end of the 6th resistance (R6), and the other end of the 6th resistance (R6) connects the collector electrode of the 6th transistor (Q6) of current source circuit simultaneously, base stage and the second transistor (Q2), the 3rd transistor (Q3), the 4th transistor (Q4), the base stage of the 5th transistor (Q5).
7. according to claim 1,3 or 4 described a kind of negative voltages regulate the led drive circuit of current balance types, it is characterized in that: the voltage between described the 5th resistance (R5) equals the inner reference voltage that compares with it of Pwm controller.
8. a kind of negative voltage according to claim 1 is regulated the led drive circuit of current balance type, it is characterized in that: the second input of described LED lamp bar respectively with the collector electrode of second transistor (Q2) of current source circuit, the 3rd transistor (Q3), the 4th transistor (Q4), the 5th transistor (Q5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220385292 CN202713737U (en) | 2012-08-03 | 2012-08-03 | LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220385292 CN202713737U (en) | 2012-08-03 | 2012-08-03 | LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
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| CN202713737U true CN202713737U (en) | 2013-01-30 |
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| CN 201220385292 Expired - Fee Related CN202713737U (en) | 2012-08-03 | 2012-08-03 | LED (Light Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779486A (en) * | 2012-08-03 | 2012-11-14 | 福建捷联电子有限公司 | LED (Light-Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
| CN103474030A (en) * | 2013-09-11 | 2013-12-25 | 深圳市瀚强科技有限公司 | Isolation LED backlight driving circuit and LED displaying device |
| CN106875899A (en) * | 2017-03-20 | 2017-06-20 | 联想(北京)有限公司 | The control method and electronic equipment of a kind of display output device |
-
2012
- 2012-08-03 CN CN 201220385292 patent/CN202713737U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779486A (en) * | 2012-08-03 | 2012-11-14 | 福建捷联电子有限公司 | LED (Light-Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
| CN103474030A (en) * | 2013-09-11 | 2013-12-25 | 深圳市瀚强科技有限公司 | Isolation LED backlight driving circuit and LED displaying device |
| CN103474030B (en) * | 2013-09-11 | 2016-10-05 | 深圳市瀚强科技股份有限公司 | A kind of isolation LED backlight drive circuit and LED display device |
| CN106875899A (en) * | 2017-03-20 | 2017-06-20 | 联想(北京)有限公司 | The control method and electronic equipment of a kind of display output device |
| CN106875899B (en) * | 2017-03-20 | 2019-07-26 | 联想(北京)有限公司 | A kind of control method and electronic equipment showing output device |
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