CN216820163U - Display power supply and display device - Google Patents
Display power supply and display device Download PDFInfo
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- CN216820163U CN216820163U CN202220204733.7U CN202220204733U CN216820163U CN 216820163 U CN216820163 U CN 216820163U CN 202220204733 U CN202220204733 U CN 202220204733U CN 216820163 U CN216820163 U CN 216820163U
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Abstract
The utility model discloses a display power supply and display equipment.A first direct current voltage transformation circuit and a second direct current voltage transformation circuit are arranged at the output end of a switching power supply circuit, and direct current voltage output by the switching power supply circuit is respectively converted into power supply voltage required by a first LED lamp bead and a second LED lamp bead. In addition, because the input voltages of the first direct current voltage transformation circuit and the second direct current voltage transformation circuit are allowed to fluctuate within the range of 2V, even if voltage fluctuation is caused due to line loss between the switching power supply circuit and the direct current voltage transformation circuit, the first direct current voltage transformation circuit and the second direct current voltage transformation circuit can still output stable power supply voltage, therefore, the output voltage of the switching power supply circuit does not need to be improved due to line loss, and the energy efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of display, in particular to a display power supply and display equipment.
Background
The LED display has the advantages of bright color, wide dynamic range, high brightness, long service life, stable and reliable work and the like, is widely applied to commercial media, cultural performance markets, stadiums, information dissemination, news distribution, security trading and the like, and can meet the requirements of different environments.
The LED display screen is mainly divided into a display module, a control system and a display power supply. The display module comprises an LED lamp bead array for emitting light; the control system is used for regulating and controlling the on-off condition in the area to realize conversion of the content displayed on the screen; the display power supply is used for converting input voltage and current to enable the input voltage and current to meet the requirements of the LED lamp beads.
Most of the existing display power supplies adopt a mode that a switching power supply directly supplies power to the LED lamp beads. Because the operating voltage of the lamp beads of different colors is different, two or more sets of different output circuits need to be configured for the switching power supply to adapt to the lamp beads of different colors, so that the material cost of the switching power supply is undoubtedly increased. From outside, there is a voltage line loss of 0.1V-0.3V from the switching power supply to the LED lamp bead, and in order not to affect the display effect of the LED display screen, the output voltage of the switching power supply needs to be properly increased, resulting in increased energy consumption.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a display power supply and display equipment, which can save the material cost of a switching power supply circuit and improve the energy efficiency.
In a first aspect, an embodiment of the present invention provides a display power supply, including a switching power supply circuit, a first dc voltage transformation circuit, and a second dc voltage transformation circuit;
the input end of the switch power supply circuit is connected with an external power supply, and the switch power supply circuit is used for converting the input alternating voltage of the external power supply into direct voltage;
the input end of the first direct-current voltage-converting circuit is connected with the output end of the switching power supply circuit, and the first direct-current voltage-converting circuit is used for converting direct-current voltage output by the switching power supply circuit into first power supply voltage to supply power for the first LED lamp beads;
the input end of the second direct current transformation circuit is connected with the output end of the switch power supply circuit, and the second direct current transformation circuit is used for converting direct current voltage output by the switch power supply circuit into second power supply voltage to supply power for the second LED lamp beads.
Optionally, the switching power supply circuit includes an input rectification circuit, a flyback circuit, and a rectification filter circuit;
the input end of the input rectifying circuit is connected with an external power supply, the output end of the input rectifying circuit is connected with the input end of the flyback circuit, and the input rectifying circuit is used for converting the input alternating voltage of the external power supply into the direct voltage required by the flyback circuit;
the input end of the rectification filter circuit is connected with the output end of the flyback circuit, and the output end of the rectification filter circuit is respectively connected with the input end of the first direct current voltage transformation circuit and the input end of the second direct current voltage transformation circuit.
Optionally, the flyback circuit includes a flyback control unit and an output transformer;
the output transformer comprises a primary winding and a secondary winding, a first end of the primary winding is connected with the positive output end of the input rectification circuit, and a second end of the primary winding is connected with a first end of the flyback control unit;
the second end of the flyback control unit is connected with the negative electrode output end of the input rectification circuit, and the control end of the flyback control unit is connected with an excitation signal;
and the first end of the secondary winding is connected with the input end of the rectification filter circuit, and the second end of the secondary winding is grounded.
Optionally, the flyback control unit includes a switching transistor;
the first end of the switching transistor is connected with the second end of the primary winding, the second end of the switching transistor is connected with the negative electrode output end of the input rectification circuit, and the control end of the switching transistor is connected with an excitation signal.
Optionally, the first dc voltage circuit includes a first input filter unit, a first dc transformer chip, a first voltage feedback unit, and a first low-pass filter unit;
the first end of the first input filtering unit is connected with the output end of the switching power supply circuit, and the second end of the first input filtering unit is grounded;
the input end of the first direct current transformation chip is connected with the output end of the switching power supply circuit, and the output end of the first direct current transformation chip is connected with the input end of the first low-pass filtering unit;
the output end of the first low-pass filtering unit is connected with the first LED lamp bead;
the first end of the first voltage feedback unit is connected with the output end of the first low-pass filter unit, and the second end of the first voltage feedback unit is connected with the feedback signal input end of the first direct current transformer chip.
Optionally, the first low-pass filtering unit includes a first inductor and a first capacitor;
the first end of the first inductor is connected with the output end of the first direct current transformer chip, and the second end of the first inductor is connected with the first LED lamp bead;
the first end of the first capacitor is connected with the second end of the first inductor, and the second end of the first capacitor is grounded.
Optionally, the first voltage feedback unit includes a first resistor and a second resistor;
the first end of the first resistor is connected with the second end of the first inductor, and the second end of the first resistor is connected with the first end of the second resistor;
the second end of the second resistor is connected with the feedback signal input end of the first direct current transformation chip, and the second end of the second resistor is grounded.
Optionally, the second dc transformer circuit includes a second input filter unit, a second dc transformer chip, a second voltage feedback unit, and a second low-pass filter unit;
the first end of the second input filter unit is connected with the output end of the switching power supply circuit, and the second end of the second input filter unit is grounded;
the input end of the second direct current transformation chip is connected with the output end of the switching power supply circuit, and the output end of the second direct current transformation chip is connected with the input end of the second low-pass filtering unit;
the output end of the second low-pass filtering unit is connected with the second LED lamp bead;
the first end of the second voltage feedback unit is connected with the output end of the second low-pass filter unit, and the second end of the second voltage feedback unit is connected with the feedback signal input end of the second direct current transformer chip.
Optionally, the second low-pass filtering unit includes a second inductor and a second capacitor;
the first end of the second inductor is connected with the output end of the second direct current transformation chip, and the second end of the second inductor is connected with the second LED lamp bead;
and the first end of the second capacitor is connected with the second end of the second inductor, and the second end of the second capacitor is grounded.
Optionally, the second voltage feedback unit includes a third resistor and a fourth resistor;
a first end of the third resistor is connected with a second end of the second inductor, and a second end of the third resistor is connected with a first end of the fourth resistor;
the second end of the fourth resistor is connected with the feedback signal input end of the second direct current transformation chip, and the second end of the fourth resistor is grounded.
In a second aspect, an embodiment of the present invention further provides a display device, including the display power supply according to the first aspect of the present invention.
The display power supply provided by the embodiment of the utility model comprises a switching power supply circuit, a first direct current voltage transformation circuit and a second direct current voltage transformation circuit. The input end of the switching power supply circuit is connected with an external power supply. The input end of the first direct current voltage-converting circuit is connected with the output end of the switching power supply circuit, and the first direct current voltage-converting circuit is used for converting direct current voltage output by the switching power supply circuit into first power supply voltage to supply power for the first LED lamp beads. The input end of the second direct current transformation circuit is connected with the output end of the switching power supply circuit, and the second direct current transformation circuit is used for converting direct current voltage output by the switching power supply circuit into second power supply voltage to supply power for the second LED lamp beads. The first direct-current voltage transformation circuit and the second direct-current voltage transformation circuit are arranged at the output end of the switching power supply circuit, and direct-current voltage output by the switching power supply circuit is converted into power supply voltage required by the first LED lamp beads and the second LED lamp beads respectively, so that two paths of output are not required to be arranged for the switching power supply circuit, and the material cost of the switching power supply circuit is saved. In addition, because the input voltages of the first direct current voltage transformation circuit and the second direct current voltage transformation circuit are allowed to fluctuate within the range of 2V, even if voltage fluctuation is caused due to line loss between the switching power supply circuit and the direct current voltage transformation circuit, the first direct current voltage transformation circuit and the second direct current voltage transformation circuit can still output stable power supply voltage, therefore, the output voltage of the switching power supply circuit does not need to be improved due to line loss, and the energy efficiency is improved.
Drawings
The utility model is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a display power supply according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a switching power supply circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a first dc voltage circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a second dc transformer circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
Fig. 1 is a schematic structural diagram of a display power supply according to an embodiment of the present invention, and as shown in fig. 1, the display power supply includes a switching power supply circuit 110, a first dc voltage transformation circuit 120, and a second dc voltage transformation circuit 130.
The input end of the switching power supply circuit 110 is connected to an external power supply, and the switching power supply circuit 110 is configured to convert an input ac voltage of the external power supply into a dc voltage VCC. Illustratively, in the embodiment of the present invention, the external power source may be a commercial power, for example, 220V ac power. The switch power supply circuit is a power supply circuit which utilizes modern power electronic technology to control the on-off time ratio of a switch transistor and maintain stable output voltage. In the embodiment of the present invention, the switching power supply circuit 110 is configured to convert an externally input ac power into a dc voltage VCC, and supply power to the first dc voltage transformation circuit 120 and the second dc voltage transformation circuit 130. It should be noted that, in the embodiment of the present invention, a specific circuit structure of the switching power supply circuit 110 is not limited, and for example, the switching power supply circuit may be an isolated switching power supply circuit, such as a flyback switching power supply circuit, or a non-isolated switching power supply circuit, and the embodiment of the present invention is not limited herein.
The input end of the first dc voltage circuit 120 is connected to the output end of the switching power supply circuit 110, and the first dc voltage circuit 120 is configured to convert a dc voltage VCC output by the switching power supply circuit 110 into a first power supply voltage Vout1 to supply power to the first LED lamp bead. Because the operating voltage of red light LED lamp pearl will be less than blue light, green glow LED lamp pearl, consequently, red light LED lamp pearl need be independent of blue light, green glow LED lamp pearl and supply power alone. Illustratively, in the embodiment of the present invention, the first LED lamp bead is a red LED lamp bead, and the first dc voltage circuit 120 supplies power to the red LED lamp bead. In the embodiment of the present invention, the specific structure of the first dc voltage circuit 120 is not limited as long as dc voltage transformation can be achieved.
The input end of the second dc transformer circuit 130 is connected to the output end of the switching power supply circuit 110, and the second dc transformer circuit 130 is configured to convert the dc voltage VCC output by the switching power supply circuit 110 into a second power supply voltage Vout2 to supply power to the second LED lamp bead. Illustratively, in the embodiment of the present invention, the second LED lamp beads are blue and green LED lamp beads, and the second dc transformer circuit 130 supplies power to the blue and green LED lamp beads.
Two paths of direct current voltage transformation circuits (a first direct current voltage transformation circuit and a second direct current voltage transformation circuit) are arranged at the output end of the switching power supply circuit 110, and direct current voltage VCC output by the switching power supply circuit 110 is converted into power supply voltage required by the first LED lamp bead and the second LED lamp bead respectively, so that two paths of output are not required to be arranged for the switching power supply circuit 110, and the material cost of the switching power supply circuit is saved. In addition, since the input voltage of the dc transformer circuits (the first dc transformer circuit and the second dc transformer circuit) allows fluctuation in the range of 2V, even if voltage fluctuation occurs due to line loss between the switching power supply circuit 110 and the dc transformer circuit, the first dc transformer circuit 120 and the second dc transformer circuit 130 can output a stable supply voltage, and thus, it is not necessary to increase the output voltage of the switching power supply circuit 110 due to line loss, and energy efficiency is improved.
The display power supply provided by the embodiment of the utility model comprises a switching power supply circuit, a first direct current voltage transformation circuit and a second direct current voltage transformation circuit. The input end of the switching power supply circuit is connected with an external power supply. The input end of the first direct current voltage conversion circuit is connected with the output end of the switching power supply circuit, and the first direct current voltage conversion circuit is used for converting direct current voltage output by the switching power supply circuit into first power supply voltage to supply power for the first LED lamp beads. The input end of the second direct current transformation circuit is connected with the output end of the switching power supply circuit, and the second direct current transformation circuit is used for converting direct current voltage output by the switching power supply circuit into second power supply voltage to supply power for the second LED lamp beads. The first direct-current voltage transformation circuit and the second direct-current voltage transformation circuit are arranged at the output end of the switching power supply circuit, and direct-current voltage output by the switching power supply circuit is converted into power supply voltage required by the first LED lamp beads and the second LED lamp beads respectively, so that two paths of output are not required to be arranged for the switching power supply circuit, and the material cost of the switching power supply circuit is saved. In addition, because the input voltages of the first direct current voltage transformation circuit and the second direct current voltage transformation circuit are allowed to fluctuate within the range of 2V, even if voltage fluctuation is caused due to line loss between the switching power supply circuit and the direct current voltage transformation circuit, the first direct current voltage transformation circuit and the second direct current voltage transformation circuit can still output stable power supply voltage, therefore, the output voltage of the switching power supply circuit does not need to be improved due to line loss, and the energy efficiency is improved.
Fig. 2 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present invention, and as shown in fig. 2, in some embodiments of the present invention, the switching power supply circuit includes an input rectification circuit 111, a flyback circuit 112, and a rectification filter circuit 113.
The input end of the input rectifying circuit 111 is connected to an external power supply, the output end of the input rectifying circuit 111 is connected to the input end of the flyback circuit 112, and the input rectifying circuit 111 is configured to convert an input ac voltage of the external power supply into a dc voltage required by the flyback circuit 112.
The input end of the rectifying and filtering circuit 113 is connected to the output end of the flyback circuit 112, and the output end of the rectifying and filtering circuit 113 is connected to the input end of the first dc voltage transformation circuit 120 and the input end of the second dc voltage transformation circuit 130, respectively.
In the embodiment of the present invention, the input rectification circuit 111 is used for rectifying and filtering the ac power input by the external power supply, and outputting the stable dc power to the flyback circuit 112. In the embodiment of the present invention, the input rectifying circuit 111 may include a transient filter circuit, which is commonly referred to as an emi (electrical interference) circuit, and an input rectifying filter circuit. The transient filter circuit is used for isolating a mains supply power grid from a display power supply, preventing interference signals generated by electronic transistors in the display power supply from influencing other electronic equipment in the power grid when the display power supply works, and preventing the interference of power grid fluctuation on the display power supply. The input rectifying and filtering circuit is used for rectifying and filtering the alternating current input by the external power supply and outputting pulsating direct current to the flyback circuit 112.
The flyback circuit 112 chops the pulsating direct current from the input rectifier circuit 111 to form a high-frequency alternating current. The rectifier/filter circuit 113 rectifies and filters the high-frequency ac power output from the flyback circuit 112, and outputs a stable dc power.
Fig. 3 is a circuit diagram of a switching power supply circuit according to an embodiment of the present invention, and as shown in fig. 3, the flyback circuit 112 includes a flyback control unit and an output transformer T.
The output transformer T comprises a primary winding Z1 and a secondary winding Z2, a first end of the primary winding Z1 is connected to the positive output end of the input rectification circuit 112, and a second end of the primary winding Z1 is connected to a first end of the flyback control unit. The second end of the flyback control unit is connected with the negative output end of the input rectification circuit 111, and the control end of the flyback control unit is connected with the excitation signal. Illustratively, in the embodiment of the present invention, the flyback control unit includes a switching transistor Q1. The first end of the switching transistor Q1 is connected with the second end of the primary winding Z1, the second end of the switching transistor Q1 is connected with the negative electrode output end of the input rectification circuit 111, and the control end of the switching transistor Q1 is connected with an excitation signal. The first end of the secondary winding Z2 is connected with the input end of the rectifying and filtering circuit 113, and the second end of the secondary winding Z2 is grounded. Illustratively, the rectifying-filtering circuit 113 includes a rectifying diode D1 and a filtering capacitor C1. An anode of the rectifying diode D1 is connected to the first end of the secondary winding Z2, and a cathode of the rectifying diode D1 is connected to the input terminals of the first dc voltage transforming circuit 120 and the second dc voltage transforming circuit 130, respectively. A first end of the filter capacitor C1 is connected with a first end of the secondary winding Z2, and a second end of the filter capacitor C1 is grounded.
In the flyback circuit 112, the primary winding Z1 and the secondary winding Z2 have opposite polarities. The switching transistor Q1 is controlled by the excitation signal to be turned on and off, when the first switching transistor Q1 is turned on, the inductor current of the primary winding Z1 starts to rise, at this time, the rectifier diode D1 is turned off due to the relationship of the same name terminal, the output transformer T stores energy, and the filter capacitor C1 supplies power to the first dc voltage conversion circuit 120 and the second dc voltage conversion circuit 130 through the rectifier filter circuit 113. When the switching transistor Q1 is turned off, the voltage induced by the inductor of the primary winding Z1 is reversed, the rectifier diode D1 is turned on, the energy in the output transformer T supplies power to the first dc voltage transforming circuit 120 and the second dc voltage transforming circuit 130 via the rectifier and filter circuit 113, the filter capacitor C1 is charged at the same time, the energy just lost is replenished, and the energy in the output transformer T supplies power to the first dc voltage transforming circuit 120 and the second dc voltage transforming circuit 130 via the rectifier and filter circuit 113. Therefore, the voltage at the output end of the rectifying and filtering circuit 113 can be collected through the feedback circuit and fed back to the control chip, and the control chip outputs the excitation signal to adjust the voltage output by the flyback circuit 112 in real time.
Fig. 4 is a circuit diagram of a first dc voltage circuit according to an embodiment of the present invention, and as shown in fig. 4, the first dc voltage circuit includes a first input filter unit 121, a first dc voltage chip U1, a first voltage feedback unit 122, and a first low-pass filter unit 123.
A first terminal of the first input filter unit 121 is connected to the output terminal of the switching power supply circuit 110 (i.e., the output terminal of the rectifying and filtering circuit 113), and a second terminal of the first input filter unit 121 is grounded. The first input filter unit 121 is configured to filter a dc voltage VCC input by the switching power supply circuit, so as to improve stability of the dc voltage.
An input terminal VIN of the first dc conversion chip U1 is connected to an output terminal of the switching power supply circuit 110, and an output terminal LX of the first dc conversion chip U1 is connected to an input terminal of the first low-pass filter unit 123. The output end of the first low-pass filtering unit 123 is connected with the first LED lamp bead to supply power to the first LED lamp bead.
A first end of the first voltage feedback unit 122 is connected to an output end of the first low-pass filtering unit 123, and a second end of the first voltage feedback unit 122 is connected to a feedback signal input end FB of the first dc voltage chip U1. The first voltage feedback unit 122 is configured to collect a voltage at the output end of the first low-pass filter unit 123 and feed back the voltage to the first dc voltage conversion chip U1, so as to adjust the output voltage of the first dc voltage conversion circuit in real time, and improve the output stability of the first dc voltage conversion circuit.
Illustratively, as shown in fig. 4, the first input filter unit 121 includes capacitors C2 and C3, a first terminal of a capacitor C2 is connected to the output terminal of the switching power supply circuit 110, a second terminal of a capacitor C2 is connected to ground, a first terminal of a capacitor C3 is connected to the output terminal of the switching power supply circuit 110, and a second terminal of a capacitor C3 is connected to ground.
The first low pass filter unit 123 includes a first inductor L1 and a first capacitor C4. In the embodiment of the present invention, the first low pass filtering unit 123 further includes a capacitor C5. The first end of the first inductor L1 is connected with the output end LX of the first direct current voltage conversion chip U1, the second end of the first inductor L1 is connected with the first LED lamp bead, and the first inductor L3878 outputs the power supply voltage Vout 1. The first end of the first capacitor C4 is connected to the second end of the first inductor L1, and the second end of the first capacitor C4 is grounded. A first terminal of the capacitor C5 is connected to the second terminal of the first inductor L1, and a second terminal of the capacitor C5 is connected to ground.
The first direct current transformation chip U1 and the first low-pass filter unit 123 constitute a BUCK circuit, the first direct current transformation chip U1 controls the voltage of the output end of the first direct current transformation chip U1, and when the output end of the first direct current transformation chip U1 outputs, the voltage output by the first direct current transformation chip U1 supplies power to the first LED lamp bead through the first inductor L1. The current in the first inductor L1 gradually rises, the self-induced electromotive force generated by the first inductor L1 prevents the current from rising, and the first inductor L1 converts the electric energy into magnetic energy to be stored. When the output end of the first direct current transformation chip U1 has no output, the current in the first inductor L1 decreases, and since the current of the first inductor L1 cannot change suddenly, the self-induced electromotive force generated in the first inductor L1 hinders the current from decreasing, and the magnetic energy stored in the first inductor L1 is converted into electric energy to be released to supply power to the first LED lamp bead. By repeating the above process and controlling the duration of the voltage at the output terminal LX of the first dc voltage conversion chip U1, the output voltage of the first dc voltage conversion circuit can be controlled.
In the embodiment of the present invention, as shown in fig. 4, the first voltage feedback unit 122 includes a first resistor R1 and a second resistor R2. A first terminal of the first resistor R1 is connected to the second terminal of the first inductor L1, and a second terminal of the first resistor R1 is connected to a first terminal of the second resistor R2. The second end of the second resistor R2 is connected with the feedback signal input end FB of the first DC voltage conversion chip U1, and the second end of the second resistor R2 is grounded. The voltage of the second resistor R2 is collected and fed back to the first DC voltage conversion chip U1, so that the first DC voltage conversion chip U1 adjusts the duration of the voltage of the output end LX in real time, and further adjusts the output voltage of the first DC voltage conversion circuit.
Fig. 5 is a circuit diagram of a second dc transformer circuit according to an embodiment of the present invention, and as shown in fig. 5, the second dc transformer circuit includes a second input filter unit 131, a second dc transformer chip U2, a second voltage feedback unit 132, and a second low-pass filter unit 133.
A first terminal of the second input filter unit 131 is connected to the output terminal of the switching power supply circuit 110 (i.e., the output terminal of the rectifying and filtering circuit 113), and a second terminal of the second input filter unit 131 is grounded. The second input filter unit 131 is configured to filter a dc voltage VCC input by the switching power supply circuit, so as to improve stability of the dc voltage.
An input terminal VIN of the second dc transformer chip U2 is connected to an output terminal of the switching power supply circuit 110, and an output terminal LX of the second dc transformer chip U2 is connected to an input terminal of the second low-pass filter unit 133. The output end of the second low-pass filtering unit 133 is connected to the second LED lamp bead to supply power to the second LED lamp bead.
A first end of the second voltage feedback unit 132 is connected to the output end of the second low-pass filter unit 133, and a second end of the second voltage feedback unit 132 is connected to the feedback signal input end FB of the second dc transformer chip U2. The second voltage feedback unit 132 is configured to collect a voltage at an output end of the second low-pass filter unit 133 and feed back the voltage to the first dc voltage transforming chip U2, so as to adjust an output voltage of the second dc voltage transforming circuit in real time, and improve output stability of the second dc voltage transforming circuit.
Illustratively, as shown in fig. 5, the second input filter unit 131 includes capacitors C6 and C7, a first terminal of the capacitor C6 is connected to the output terminal of the switching power supply circuit 110, a second terminal of the capacitor C6 is connected to ground, a first terminal of the capacitor C7 is connected to the output terminal of the switching power supply circuit 110, and a second terminal of the capacitor C7 is connected to ground.
The second low pass filtering unit 133 includes a second inductor L2 and a second capacitor C8. In the embodiment of the present invention, the second low pass filtering unit 133 further includes a capacitor C9. The first end of the second inductor L2 is connected with the output end LX of the second direct current transformer chip U2, the second end of the second inductor L2 is connected with the second LED lamp bead, and the power supply voltage Vout2 is output. A first terminal of the second capacitor C8 is connected to the second terminal of the second inductor L2, and a second terminal of the second capacitor C8 is grounded. A first terminal of the capacitor C9 is connected to the second terminal of the second inductor L2, and a second terminal of the capacitor C9 is grounded.
The second dc transformer chip U2 and the second low-pass filter unit 133 form a BUCK circuit, and the working principle of the BUCK circuit can refer to the first dc transformer chip U1 and the first low-pass filter unit 123 in the foregoing embodiment to form the BUCK circuit, which is not described herein again in this embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 5, the second voltage feedback unit 132 includes a third resistor R3 and a fourth resistor R4. A first terminal of the third resistor R3 is connected to the second terminal of the second inductor L2, and a second terminal of the third resistor R3 is connected to a first terminal of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the feedback signal input FB of the second dc transformer chip U2, and the second end of the fourth resistor R4 is grounded. The voltage of the fourth resistor R4 is collected and fed back to the second direct current transformation chip U2, so that the second direct current transformation chip U2 can adjust the duration of the voltage of the output end LX in real time, and further adjust the output voltage of the second direct current transformation circuit.
An embodiment of the present invention further provides a display device, which includes the display power supply according to any of the foregoing embodiments of the present invention, and for example, the display device may include a television, a computer monitor, a smart phone, a tablet computer, and the like, which is not limited herein. The specific structure and operation principle of the display power supply are described in detail in the foregoing embodiments, and the embodiments of the present invention are not described herein again.
The display device provided by the embodiment of the utility model has the same effect as the display power supply described in the previous embodiment of the utility model, and the embodiment of the utility model is not described herein again.
In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in a descriptive sense or positional relationship based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principles of the present invention have been described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.
Claims (11)
1. A display power supply is characterized by comprising a switching power supply circuit, a first direct current voltage transformation circuit and a second direct current voltage transformation circuit;
the input end of the switching power supply circuit is connected with an external power supply, and the switching power supply circuit is used for converting the input alternating-current voltage of the external power supply into direct-current voltage;
the input end of the first direct-current voltage-converting circuit is connected with the output end of the switching power supply circuit, and the first direct-current voltage-converting circuit is used for converting direct-current voltage output by the switching power supply circuit into first power supply voltage to supply power for the first LED lamp beads;
the input end of the second direct current transformation circuit is connected with the output end of the switch power supply circuit, and the second direct current transformation circuit is used for converting direct current voltage output by the switch power supply circuit into second power supply voltage to supply power for the second LED lamp beads.
2. The display power supply according to claim 1, wherein the switching power supply circuit includes an input rectification circuit, a flyback circuit, and a rectification filter circuit;
the input end of the input rectifying circuit is connected with an external power supply, the output end of the input rectifying circuit is connected with the input end of the flyback circuit, and the input rectifying circuit is used for converting the input alternating voltage of the external power supply into the direct voltage required by the flyback circuit;
the input end of the rectification filter circuit is connected with the output end of the flyback circuit, and the output end of the rectification filter circuit is respectively connected with the input end of the first direct current voltage transformation circuit and the input end of the second direct current voltage transformation circuit.
3. The display power supply of claim 2, wherein the flyback circuit comprises a flyback control unit and an output transformer;
the output transformer comprises a primary winding and a secondary winding, a first end of the primary winding is connected with the positive output end of the input rectifying circuit, and a second end of the primary winding is connected with a first end of the flyback control unit;
the second end of the flyback control unit is connected with the negative electrode output end of the input rectification circuit, and the control end of the flyback control unit is connected with an excitation signal;
and the first end of the secondary winding is connected with the input end of the rectification filter circuit, and the second end of the secondary winding is grounded.
4. The display power supply of claim 3, wherein the flyback control unit comprises a switching transistor;
the first end of the switching transistor is connected with the second end of the primary winding, the second end of the switching transistor is connected with the negative electrode output end of the input rectification circuit, and the control end of the switching transistor is connected with an excitation signal.
5. The display power supply according to any one of claims 1 to 4, wherein the first DC voltage circuit comprises a first input filter unit, a first DC transformer chip, a first voltage feedback unit and a first low pass filter unit;
the first end of the first input filtering unit is connected with the output end of the switching power supply circuit, and the second end of the first input filtering unit is grounded;
the input end of the first direct current transformation chip is connected with the output end of the switching power supply circuit, and the output end of the first direct current transformation chip is connected with the input end of the first low-pass filtering unit;
the output end of the first low-pass filtering unit is connected with the first LED lamp bead;
the first end of the first voltage feedback unit is connected with the output end of the first low-pass filter unit, and the second end of the first voltage feedback unit is connected with the feedback signal input end of the first direct current transformer chip.
6. The display power supply according to claim 5, wherein the first low-pass filtering unit comprises a first inductor and a first capacitor;
the first end of the first inductor is connected with the output end of the first direct current transformation chip, and the second end of the first inductor is connected with the first LED lamp bead;
the first end of the first capacitor is connected with the second end of the first inductor, and the second end of the first capacitor is grounded.
7. The display power supply according to claim 6, wherein the first voltage feedback unit includes a first resistor and a second resistor;
the first end of the first resistor is connected with the second end of the first inductor, and the second end of the first resistor is connected with the first end of the second resistor;
the second end of the second resistor is connected with the feedback signal input end of the first direct current transformation chip, and the second end of the second resistor is grounded.
8. The display power supply according to any one of claims 1 to 4, 6 and 7, wherein the second dc transformer circuit comprises a second input filter unit, a second dc transformer chip, a second voltage feedback unit and a second low pass filter unit;
the first end of the second input filter unit is connected with the output end of the switching power supply circuit, and the second end of the second input filter unit is grounded;
the input end of the second direct current transformation chip is connected with the output end of the switching power supply circuit, and the output end of the second direct current transformation chip is connected with the input end of the second low-pass filtering unit;
the output end of the second low-pass filtering unit is connected with the second LED lamp bead;
the first end of the second voltage feedback unit is connected with the output end of the second low-pass filter unit, and the second end of the second voltage feedback unit is connected with the feedback signal input end of the second direct current transformer chip.
9. The display power supply according to claim 8, wherein the second low-pass filter unit comprises a second inductor and a second capacitor;
the first end of the second inductor is connected with the output end of the second direct current transformation chip, and the second end of the second inductor is connected with the second LED lamp bead;
and the first end of the second capacitor is connected with the second end of the second inductor, and the second end of the second capacitor is grounded.
10. The display power supply according to claim 9, wherein the second voltage feedback unit includes a third resistor and a fourth resistor;
a first end of the third resistor is connected with a second end of the second inductor, and a second end of the third resistor is connected with a first end of the fourth resistor;
the second end of the fourth resistor is connected with the feedback signal input end of the second direct current transformer chip, and the second end of the fourth resistor is grounded.
11. A display device comprising a display power supply according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220204733.7U CN216820163U (en) | 2022-01-25 | 2022-01-25 | Display power supply and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220204733.7U CN216820163U (en) | 2022-01-25 | 2022-01-25 | Display power supply and display device |
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| CN216820163U true CN216820163U (en) | 2022-06-24 |
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| CN202220204733.7U Active CN216820163U (en) | 2022-01-25 | 2022-01-25 | Display power supply and display device |
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| CN (1) | CN216820163U (en) |
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Address after: 710000 North of Fengdong Second Road and East of Fenghao Avenue in Fengdong New Town, Xi'an, Shaanxi Patentee after: QSTECH Co.,Ltd. Address before: 710118 first floor, No. 7, Biyuan Second Road, high tech Zone, Xi'an, Shaanxi Province Patentee before: QSTECH Co.,Ltd. |