CN213126545U - Energy-saving control circuit of backlight source - Google Patents
Energy-saving control circuit of backlight source Download PDFInfo
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- CN213126545U CN213126545U CN202022119652.0U CN202022119652U CN213126545U CN 213126545 U CN213126545 U CN 213126545U CN 202022119652 U CN202022119652 U CN 202022119652U CN 213126545 U CN213126545 U CN 213126545U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to an energy-saving control circuit of a backlight source, which comprises a current control chip; when the current control chip works, the HO end outputs high level, the first field effect tube is conducted, the LED backlight source gets power from a power supply, the inductor and the energy storage capacitor store electric energy, the IFB end of the current control chip obtains feedback voltage, the feedback voltage is generated by serial voltage division of the LED backlight source and the second resistor, and when the feedback voltage is higher than the set voltage, the HO end of the current control chip outputs low level and the LO end outputs high level; at the moment, the electric energy stored by the inductor and the energy storage capacitor is released to provide power supply for the LED backlight source, meanwhile, the feedback voltage drops sharply, and when the feedback voltage is lower than the set voltage, the HO end of the current control chip outputs a high level and the LO end outputs a low level; the purpose of stabilizing the average current is achieved by reciprocating in the way; therefore, the brightness of the LED backlight source can be adjusted while the average current is stabilized to realize energy saving; and the circuit is simple, the cost is low, the size is small, and the applicability is wide.
Description
Technical Field
The utility model relates to a backlight is energy-conserving technical field, more specifically says, relates to an energy-conserving control circuit of backlight.
Background
Most of energy-saving control circuits of the existing backlight source achieve the purpose of energy saving by controlling peak current, subharmonic oscillation and other conditions can occur, so that the operation of the circuit is unstable, the anti-interference capability is weakened, and the equivalent switching frequency is halved seriously, and the output power is reduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit simple, with low costs, small, convenient to use, extensive applicability's energy-saving control circuit of backlight.
The utility model provides a technical scheme that its technical problem adopted is:
an energy-saving control circuit of a backlight source is constructed, and comprises a current control chip; the VS end of the current control chip is connected with a first field effect transistor, a second field effect transistor and an inductor; the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor are both connected with the VS end of the current control chip, the drain electrode of the first field effect transistor is connected with the anode of a power supply, and the source electrode of the second field effect transistor is connected with the cathode of the power supply and grounded; the other end of the inductor is connected with the positive electrode of a power supply of the LED backlight source and is also connected with an energy storage capacitor, the positive electrode of the energy storage capacitor is connected with the other end of the inductor, the negative electrode of the power supply of the LED backlight source is connected with a first resistor, and the negative electrode of the power supply of the LED backlight source is connected with a second resistor and is also connected with the IFB end of the current control chip; the other ends of the first resistor and the second resistor are grounded;
the grid electrode of the first field effect tube is connected with the HO end of the current control chip, and the grid electrode of the second field effect tube is connected with the LO end of the current control chip; the ENN end of the current control chip is also connected with a first diode, the cathode of the first diode is connected with the ENN end of the current control chip, and the anode of the first diode is connected with an external control circuit.
The utility model discloses an energy-saving control circuit of backlight, wherein, the other end of inductance is connected with the third resistance, the other end of the third resistance is connected with the fourth resistance and the first zener diode; the other end of the fourth resistor is grounded, the cathode of the first voltage stabilizing diode is connected with the other end of the third resistor, and the anode of the first voltage stabilizing diode is connected with the ENN end of the current control chip.
The utility model discloses an energy-saving control circuit of backlight, wherein, the positive pole of power is connected with the fifth resistance, the other end of fifth resistance with the VCC end of current control chip is connected; the other end of the inductor is also connected with a second diode, the anode of the second diode is connected with the other end of the inductor, the cathode of the second diode is connected with a sixth resistor, and the other end of the sixth resistor is connected with the other end of the fifth resistor and is also connected with a third diode; the anode of the third diode is connected with the other end of the sixth resistor, and the cathode of the third diode is connected with the VB end of the current control chip; and a VB end and a VS end of the current control chip are connected with a first capacitor in parallel.
The utility model discloses an energy-saving control circuit of backlight, wherein, the VCC end of current control chip is connected with second zener diode, the negative pole of second zener diode with the VCC end of current control chip is connected and the negative pole with the COM end of current control chip is connected and ground connection; and a VCC end and a COM end of the current control chip are connected with a second capacitor in parallel.
Energy-conserving control circuit of backlight, wherein, current control chip's model is IRS 2540.
The beneficial effects of the utility model reside in that: when the current control chip works, the HO end outputs high level, the first field effect tube is conducted, the LED backlight source gets power from a power supply, the inductor and the energy storage capacitor store electric energy, the IFB end of the current control chip obtains feedback voltage, the feedback voltage is generated by serial voltage division of the LED backlight source and the second resistor, and when the feedback voltage is higher than the set voltage, the HO end of the current control chip outputs low level and the LO end outputs high level; at the moment, the electric energy stored by the inductor and the energy storage capacitor is released to provide power supply for the LED backlight source, meanwhile, the feedback voltage drops sharply, and when the feedback voltage is lower than the set voltage, the HO end of the current control chip outputs a high level and the LO end outputs a low level; the purpose of stabilizing the average current is achieved by reciprocating in the way; the ENN end of the current control chip is the control end of the energy-saving control circuit of the backlight source and is connected with and controlled by an external control circuit, when dimming is needed, a duty ratio signal with fixed frequency is added to the ENN end of the current control chip, if the duty ratio of the signal is 50%, the maximum 50% brightness output can be realized, and if the duty ratio is 30%, the maximum 70% brightness output can be realized; the first resistor is used for being charged and discharged in cooperation with the energy storage capacitor, and the first diode is used for prohibiting the ENN end of the current control chip from being pulled down reversely; therefore, the brightness of the LED backlight source can be adjusted while the average current is stabilized to realize energy saving; and the circuit is simple, the cost is low, the size is small, and the applicability is wide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
fig. 1 is a schematic circuit diagram of an energy-saving control circuit of a backlight according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The energy-saving control circuit of the backlight source of the preferred embodiment of the present invention is shown in fig. 1; includes a current control chip IC 1; the VS end of the current control chip IC1 is connected with a first field effect transistor M1, a second field effect transistor M2 and an inductor L1; the source electrode of the first field-effect tube M1 and the drain electrode of the second field-effect tube M2 are both connected with the VS end of the current control chip IC1, the drain electrode of the first field-effect tube M1 is connected with the anode of the power supply, and the source electrode of the second field-effect tube M2 is connected with the cathode of the power supply and grounded; the other end of the inductor L1 is connected with the positive electrode of a power supply of the LED backlight D1 and is also connected with an energy storage capacitor C1, the positive electrode of the energy storage capacitor C1 is connected with the other end of the inductor L1, the negative electrode of the energy storage capacitor C1 is connected with a first resistor R1, and the negative electrode of the power supply of the LED backlight D1 is connected with a second resistor R2 and is also connected with the IFB end of the current control chip IC 1; the other ends of the first resistor R1 and the second resistor R2 are both grounded;
the grid of the first field effect transistor M1 is connected with the HO end of the current control chip IC1, and the grid of the second field effect transistor M2 is connected with the LO end of the current control chip IC 1; the ENN end of the current control chip IC1 is also connected with a first diode D4, the cathode of the first diode D4 is connected with the ENN end of the current control chip IC1, and the anode is connected with an external control circuit;
when the current control chip IC1 works, the HO end outputs high level, the first field effect transistor M1 is turned on, the LED backlight D1 gets power from the power supply, the inductor L1 and the energy storage capacitor C1 store electric energy, the IFB end of the current control chip IC1 obtains feedback voltage, the feedback voltage is generated by serially connecting the LED backlight D1 and the second resistor R2 for voltage division, and when the feedback voltage is higher than the set voltage, the HO end of the current control chip IC1 outputs low level and the LO end outputs high level; at this time, the electric energy stored by the inductor L1 and the energy storage capacitor C1 is released to provide power supply for the LED backlight D1, and simultaneously, the feedback voltage drops sharply, and when the feedback voltage is lower than the set voltage, the HO end of the current control chip IC1 outputs a high level and the LO end outputs a low level; the purpose of stabilizing the average current is achieved by reciprocating in the way; the ENN end of the current control chip IC1 is the control end of the energy-saving control circuit of the backlight source and is connected with and controlled by an external control circuit, when dimming is needed, a duty ratio signal with fixed frequency is added to the ENN end of the current control chip IC1, if the duty ratio of the signal is 50%, the maximum 50% brightness output can be realized, and if the duty ratio is 30%, the maximum 70% brightness output can be realized; the first resistor R1 is used for charging and discharging in cooperation with the energy storage capacitor C1, and the first diode D4 is used for prohibiting the ENN end of the current control chip IC1 from being pulled down reversely; therefore, the brightness of the LED backlight D1 can be adjusted while the average current is stabilized to realize energy saving; and the circuit is simple, the cost is low, the size is small, and the applicability is wide.
As shown in fig. 1, the other end of the inductor L1 is connected to a third resistor R3, and the other end of the third resistor R3 is connected to a fourth resistor R4 and a first zener diode D3; the other end of the fourth resistor R4 is grounded, the cathode of the first voltage-stabilizing diode D3 is connected with the other end of the third resistor R3, and the anode of the first voltage-stabilizing diode D3 is connected with the ENN end of the current control chip IC 1; the purposes of stabilizing the voltage of the ENN end of the current control line chip and realizing average current are achieved; and when the voltage of the ENN terminal of the current control chip IC1 reaches the set voltage of the chip of 2.5V, the current control chip IC1 is disabled.
As shown in fig. 1, the positive electrode of the power supply is connected with a fifth resistor R7, and the other end of the fifth resistor R7 is connected with the VCC terminal of the current control chip IC 1; the other end of the inductor L1 is further connected with a second diode D6, the anode of the second diode D6 is connected with the other end of the inductor L1, the cathode of the second diode D6 is connected with a sixth resistor R6, the other end of the sixth resistor R6 is connected with the other end of the fifth resistor R7, and the other end of the sixth resistor R6 is further connected with a third diode D5; the anode of the third diode D5 is connected to the other end of the sixth resistor R6, and the cathode is connected to the VB terminal of the current control chip IC 1; a first capacitor C5 is connected in parallel between the VB end and the VS end of the current control chip IC 1; the use requirement of the current control chip IC1 is met, and the operation stability of the circuit is improved.
As shown in fig. 1, the VCC terminal of the current control chip IC1 is connected to the second zener diode D2, the cathode of the second zener diode D2 is connected to the VCC terminal of the current control chip IC1, and the cathode is connected to the COM terminal of the current control chip IC1 and grounded; a second capacitor C2 is connected in parallel between the VCC end and the COM end of the current control chip IC 1; the voltage stabilization of the input power supply of the current control chip IC1 is realized, so that the operation stability of the circuit is improved.
As shown in fig. 1, current control chip IC1 is model number IRS 2540; the current control chip IC1 employs a unique high-side driver to continuously monitor the load current and precisely regulate the current by time delay hysteresis control, thereby providing a significant average current control function.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (5)
1. An energy-saving control circuit of a backlight source comprises a current control chip; the power supply is characterized in that a VS end of the current control chip is connected with a first field effect transistor, a second field effect transistor and an inductor; the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor are both connected with the VS end of the current control chip, the drain electrode of the first field effect transistor is connected with the anode of a power supply, and the source electrode of the second field effect transistor is connected with the cathode of the power supply and grounded; the other end of the inductor is connected with the positive electrode of a power supply of the LED backlight source and is also connected with an energy storage capacitor, the positive electrode of the energy storage capacitor is connected with the other end of the inductor, the negative electrode of the power supply of the LED backlight source is connected with a first resistor, and the negative electrode of the power supply of the LED backlight source is connected with a second resistor and is also connected with the IFB end of the current control chip; the other ends of the first resistor and the second resistor are grounded;
the grid electrode of the first field effect tube is connected with the HO end of the current control chip, and the grid electrode of the second field effect tube is connected with the LO end of the current control chip; the ENN end of the current control chip is also connected with a first diode, the cathode of the first diode is connected with the ENN end of the current control chip, and the anode of the first diode is connected with an external control circuit.
2. The backlight source energy-saving control circuit according to claim 1, wherein a third resistor is connected to the other end of the inductor, and a fourth resistor and a first voltage regulator diode are connected to the other end of the third resistor; the other end of the fourth resistor is grounded, the cathode of the first voltage stabilizing diode is connected with the other end of the third resistor, and the anode of the first voltage stabilizing diode is connected with the ENN end of the current control chip.
3. The energy-saving control circuit of the backlight source according to claim 1, wherein a positive electrode of the power supply is connected to a fifth resistor, and the other end of the fifth resistor is connected to a VCC terminal of the current control chip; the other end of the inductor is also connected with a second diode, the anode of the second diode is connected with the other end of the inductor, the cathode of the second diode is connected with a sixth resistor, and the other end of the sixth resistor is connected with the other end of the fifth resistor and is also connected with a third diode; the anode of the third diode is connected with the other end of the sixth resistor, and the cathode of the third diode is connected with the VB end of the current control chip; and a VB end and a VS end of the current control chip are connected with a first capacitor in parallel.
4. The backlight source energy-saving control circuit according to claim 1, wherein a VCC terminal of the current control chip is connected to a second zener diode, a negative electrode of the second zener diode is connected to the VCC terminal of the current control chip and a negative electrode of the second zener diode is connected to a COM terminal of the current control chip and grounded; and a VCC end and a COM end of the current control chip are connected with a second capacitor in parallel.
5. The backlight source energy-saving control circuit of claim 1, wherein the model of the current control chip is IRS 2540.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022119652.0U CN213126545U (en) | 2020-09-24 | 2020-09-24 | Energy-saving control circuit of backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022119652.0U CN213126545U (en) | 2020-09-24 | 2020-09-24 | Energy-saving control circuit of backlight source |
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| Publication Number | Publication Date |
|---|---|
| CN213126545U true CN213126545U (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022119652.0U Active CN213126545U (en) | 2020-09-24 | 2020-09-24 | Energy-saving control circuit of backlight source |
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| CN (1) | CN213126545U (en) |
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- 2020-09-24 CN CN202022119652.0U patent/CN213126545U/en active Active
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