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CN-122028246-A - Driving circuit for double-pin double-color lamp and double-color lamp device

CN122028246ACN 122028246 ACN122028246 ACN 122028246ACN-122028246-A

Abstract

The present disclosure relates to a driving circuit for a bi-pin bi-color lamp and a bi-color lamp apparatus. The driving circuit includes a first input terminal connected to a first output terminal of a driving source to receive a first input having a first voltage value, a second input terminal connected to a second output terminal of the driving source to receive a second input having a second voltage value, a first current limiting unit connected to a first terminal of a bi-color lamp to limit a driving current flowing through the bi-color lamp, a second current limiting unit connected to a second terminal of the bi-color lamp to limit the driving current flowing through the bi-color lamp, and a control unit connected to the first current limiting unit and/or the second current limiting unit and controlling the first current limiting unit and/or the second current limiting unit to perform current limiting according to the first input and/or the second input such that the first light emitting diode and the second light emitting diode have the same light emitting luminance.

Inventors

  • WU XIN
  • Lei Bozhe

Assignees

  • 深圳市联洲国际技术有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (11)

  1. 1. A drive circuit for a bi-pin bi-color lamp, comprising: a first input terminal connected to a first output terminal of the driving source to receive a first input having a first voltage value; a second input terminal connected to a second output terminal of the driving source to receive a second input having a second voltage value; a first current limiting unit connected to a first end of the bi-color lamp to limit a driving current flowing through the bi-color lamp; A second current limiting unit connected to a second end of the bi-color lamp to limit a driving current flowing through the bi-color lamp, the bi-color lamp including a first light emitting diode having a first light emitting rate and emitting a first color and a second light emitting diode having a second light emitting rate and emitting a second color, the first light emitting diode and the second light emitting diode being connected by positive and negative connection, and And the control unit is connected to the first current limiting unit and/or the second current limiting unit, and controls the first current limiting unit and/or the second current limiting unit to conduct current limiting according to the first input and/or the second input, so that the first light emitting diode and the second light emitting diode have the same light emitting brightness.
  2. 2. The driving circuit according to claim 1, wherein the control unit controls an operation mode of the bi-color lamp according to the first input and/or the second input, Wherein in a first mode, the control unit controls the first current limiting unit and/or the second current limiting unit to limit current, and a first driving current flows through the first light emitting diode of the bi-color lamp in a first direction so that the first light emitting diode has a first light emitting brightness, In a second mode, the control unit controls the first current limiting unit and/or the second current limiting unit to limit current, and a second driving current flows through the second light emitting diode of the bi-color lamp in a second direction opposite to the first direction, so that the second light emitting diode has a second light emitting brightness, The first light emission luminance is the same as the second light emission luminance.
  3. 3. The driving circuit of claim 2, wherein the control unit controls the operation mode of the bi-color lamp to be the first mode in response to the second voltage value of the second input being a high level and the first voltage value of the first input being a low level, and And the control unit controls the working mode of the bicolor lamp to be a second mode in response to the second voltage value of the second input being a low level and the first voltage value of the first input being a high level.
  4. 4. The driving circuit according to claim 3, wherein a first light-emitting rate of the first light-emitting diode is lower than a second light-emitting rate of the second light-emitting diode, and In a first mode, the control unit controls the first current limiting unit or the second current limiting unit to limit current, and a first driving current flows through the first light emitting diode of the bi-color lamp in a first direction so that the first light emitting diode has a first light emitting brightness, In a second mode, the control unit controls the first current limiting unit and the second current limiting unit to perform current limiting, and a second driving current flows through the second light emitting diode of the bi-color lamp in a second direction so that the second light emitting diode has a second light emitting brightness, The first drive current is greater than the second drive current.
  5. 5. The driving circuit of claim 4, wherein the control unit comprises a control transistor having a first terminal connected to the second input terminal and a first terminal of the second current limiting unit, a second terminal connected to the first input terminal and a first terminal of the first current limiting unit, and a third terminal connected to a second terminal of the first current limiting unit and a first terminal of the bi-color lamp, The first end of the first current limiting unit is connected to the first input end, the second end is connected to the first end of the bi-color lamp, The first end of the second current limiting unit is connected to the second input end, and the second end is connected to the second end of the bi-color lamp.
  6. 6. The driving circuit according to claim 5, wherein the control transistor controls the second terminal and the third terminal to be turned on in response to the second input received from the second input terminal by the first terminal of the control transistor being high, and The control transistor controls the second terminal and the third terminal to be turned off in response to the first terminal of the control transistor receiving the second input from the second input terminal being low.
  7. 7. The driving circuit of claim 4, wherein the control unit comprises a diode having an anode connected to the second input terminal and a cathode connected to the first terminal of the second current limiting unit and the second terminal of the bi-color lamp The first end of the first current limiting unit is connected to the first input end, the second end is connected to the first end of the bi-color lamp, The first terminal of the second current limiting unit is connected to the second terminal of the control transistor and the second terminal of the bi-color lamp, and the second terminal is connected to ground.
  8. 8. The driving circuit of claim 4, wherein the control unit comprises a diode having an anode connected to the second input terminal and the first terminal of the second current limiting unit, a cathode connected to the second terminal of the second current limiting unit and the second terminal of the bi-color lamp, The first current limiting unit has a first end connected to the first input terminal and a second end connected to a first end of the bi-color lamp.
  9. 9. The drive circuit of claim 1, wherein the first current limiting unit comprises at least one resistor and the second current limiting unit comprises at least one resistor.
  10. 10. The drive circuit of claim 1, wherein the first light emitting diode is a green light emitting diode and the second light emitting diode is a yellow light emitting diode, or The first light emitting diode is a green light emitting diode, and the second light emitting diode is a red light emitting diode, or The first light emitting diode is a yellow light emitting diode and the second light emitting diode is a red light emitting diode.
  11. 11. A bi-color lamp device comprising: The driving source comprises a first output end and a second output end, wherein the first output end outputs a first output of a first voltage value, and the second output end outputs a second output of a second voltage value; A bicolor lamp comprising a first LED with a first luminous rate and emitting a first color and a second LED with a second luminous rate and emitting a second color, wherein the first LED and the second LED are connected by adopting a positive-negative connection mode, and A drive circuit as claimed in any one of claims 1 to 10.

Description

Driving circuit for double-pin double-color lamp and double-color lamp device Technical Field Aspects of the present disclosure relate generally to the field of electronic devices and to a driving circuit for a dual-pin bi-color lamp and a bi-color lamp apparatus. Background The dual-pin dual-color lamp is widely applied to various electronic products in the forms of lamp holders or RJ45 with lamps and the like. For example, bi-pin bi-color light applications are more common in products such as switches that require indication of different rates of multiple ports. The existing two-color lamp circuit mainly comprises a driving source, a driving circuit part and two-color LED lamps. Currently common driving sources include chip IO (direct drive), shift register (indirect drive), and the like. The driving circuit of the bi-color lamp shares one driving path when driving the two color LEDs to light, and thus shares the same current limiting resistor. This results in the drive circuit driving substantially identical drive currents when driving the two color LEDs to light. However, since the light emission rates of the two color LEDs are different at the same driving current, there is often a problem that the brightness is not uniform, which negatively affects the perception of the user. At present, the current limiting resistor can be adjusted to ensure that the double-color lamp is not too dark and too dazzling as far as possible, and the brightness performance difference of the actual yellow-green double-color lamp is still larger. Therefore, a more balanced driving circuit for the dual-pin dual-color lamp is needed, and the light intensity of the two-color LEDs can be freely adjusted, so that the light intensity of the dual-color lamp is balanced, and the perception of a user is improved. Disclosure of Invention In order to solve the technical problem, according to the embodiment of the disclosure, through the optimal design of the dual-color lamp driving circuit with the dual-driving pins, different conduction paths are provided in different conduction directions, and the light intensity of the LEDs with two colors can be freely adjusted, so that the light intensity of the dual-color lamp is balanced, and the perception of a user is improved. According to an embodiment of the present disclosure, there is provided a driving circuit for a dual-pin bi-color lamp, including: a first input terminal connected to a first output terminal of the driving source to receive a first input having a first voltage value; a second input terminal connected to a second output terminal of the driving source to receive a second input having a second voltage value; a first current limiting unit connected to a first end of the bi-color lamp to limit a driving current flowing through the bi-color lamp; A second current limiting unit connected to a second end of the bi-color lamp to limit a driving current flowing through the bi-color lamp, the bi-color lamp including a first light emitting diode having a first light emitting rate and emitting a first color and a second light emitting diode having a second light emitting rate and emitting a second color, the first light emitting diode and the second light emitting diode being connected by positive and negative connection, and And the control unit is connected to the first current limiting unit and/or the second current limiting unit, and controls the first current limiting unit and/or the second current limiting unit to conduct current limiting according to the first input and/or the second input, so that the first light emitting diode and the second light emitting diode have the same light emitting brightness. Optionally, the control unit controls the operation mode of the bi-color lamp according to the first input and/or the second input, Wherein in a first mode, the control unit controls the first current limiting unit and/or the second current limiting unit to limit current, and a first driving current flows through the first light emitting diode of the bi-color lamp in a first direction so that the first light emitting diode has a first light emitting brightness, In a second mode, the control unit controls the first current limiting unit and/or the second current limiting unit to limit current, and a second driving current flows through the second light emitting diode of the bi-color lamp in a second direction opposite to the first direction, so that the second light emitting diode has a second light emitting brightness, The first light emission luminance is the same as the second light emission luminance. Optionally, in response to the second voltage value of the second input being high and the first voltage value of the first input being low, the control unit controls the operation mode of the bi-color lamp to be a first mode, and And the control unit controls the working mode of the bicolor lamp to be a second mode in response to the second voltage value of the second input