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CN-122028256-A - Light-emitting element driving circuit with low heating

CN122028256ACN 122028256 ACN122028256 ACN 122028256ACN-122028256-A

Abstract

The invention discloses a light-emitting element driving circuit with low heat generation, which comprises a Voltage regulator Voltage Regulator, a multi-path Voltage Selector, a VIN Voltage detector VIN Monitor, a constant Current Source I DRV , a constant Current Source with configurable Current magnitude, a switch SW and a shared resistor R SHUNT . The invention optimizes and reduces the self power consumption and heat of the driving circuit, and greatly widens the application range of the power supply voltage VIN under the same current condition.

Inventors

  • GE JIAMING
  • JU JIANHONG
  • ZHUANG HUALONG
  • MAO WEI

Assignees

  • 江苏帝奥微电子股份有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (9)

  1. 1. A low-heating light-emitting element driving circuit is characterized by comprising a Voltage regulator Voltage Regulator, a multi-path Voltage Selector, a VIN Voltage detector VIN Monitor, a constant Current Source I DRV , a constant Current Source capable of configuring Current, a switch SW and a shared resistor R SHUNT , wherein the power end of the Voltage regulator Voltage Regulator, the power end of the VIN Voltage detector VIN Monitor and one end of the shared resistor R SHUNT are connected with an input power VIN, the output end of the Voltage regulator Voltage Regulator is connected with the input end of the constant Current Source capable of configuring Current and the other end of the shared resistor R SHUNT and generates a signal VINS, the N output ends of the constant Current Source capable of configuring Current are respectively connected with the N input ends of the multi-path Voltage Selector VIN Voltage Selector one by one and sequentially generate signals OUT 1-OUTN, the output end of the multi-path Voltage Selector is connected with the input end of the Voltage regulator Voltage Regulator, the output end of the Voltage detector Monitor SW is connected with the control end of the switch SW and one end of the other end of the switch 42I is connected with the other end of the constant Current Source I4225.
  2. 2. The light-emitting device driving circuit with low heat generation according to claim 1, wherein the Voltage regulator Voltage Regulator comprises a Voltage Buffer, a main operational amplifier AMP and a built-in power tube MOS, wherein an input end of the Voltage Buffer is connected with an output end of a multi-path Voltage Selector and inputs a signal OUT_SMP, an output end of the Voltage Buffer is connected with a non-inverting input end of the main operational amplifier AMP and generates a signal OUT_BUF, an output end of the main operational amplifier AMP is connected with a grid electrode of the built-in power tube MOS and generates a signal NGATE, a drain electrode of the built-in power tube MOS is connected with an input power source VIN, and a source electrode of the built-in power tube MOS is connected with an input end of the multi-path Voltage Selector and is connected with an inverting input end of the main operational amplifier AMP after a signal-V HR is overlapped.
  3. 3. A low heat generating light emitting device driving circuit as set forth in claim 2, wherein the Voltage Buffer comprises a Buffer BUF having a non-inverting input connected to the signal OUT_SMP and an output connected to an inverting input of the Buffer BUF and generating the signal OUT_BUF.
  4. 4. The light-emitting device driving circuit with low heat generation according to claim 2, wherein the main operational amplifier AMP comprises a current source I0, a PMOS tube M1, a PMOS tube M2, NMOS tubes M3-M6 and PMOS tubes M7-M10, one end of the current source I0 is connected with a reference voltage VREG, the other end of the current source I0 is connected with the source of the PMOS tube M1 and the source of the PMOS tube M2, the grid electrode of the PMOS tube M1 is used as a positive input end of the main operational amplifier AMP, the grid electrode of the PMOS tube M2 is used as an inverting input end of the main operational amplifier AMP, the drain electrode of the PMOS tube M1 is connected with the drain electrode of the NMOS tube M3 and the source electrode of the NMOS tube M5, the drain electrode of the PMOS tube M2 is connected with the drain electrode of the NMOS tube M4 and the source electrode of the NMOS tube M6, the source electrode of the NMOS tube M3 and the source electrode of the NMOS tube M4 are grounded, the source electrode of the NMOS tube M3 and the grid electrode of the NMOS tube M4 are connected with a bias voltage, the drain electrode of the NMOS tube M5 and the grid electrode of the NMOS tube M6 are connected with the grid electrode of the PMOS tube M9 and the drain electrode of the PMOS tube M8 is connected with the drain electrode of the PMOS tube M8, and the drain electrode of the PMOS tube M8 is connected with the drain electrode of the PMOS tube M8.
  5. 5. The light-emitting device driving circuit of claim 1, wherein the Voltage Selector comprises a diode D 1 ～D N , wherein the anodes of the diodes D 1 ～D N are sequentially connected with each other to input signals OUT 1-OUTN, and the cathodes of the diodes D 1 ～D N are connected with each other to output a signal OUT_SMP.
  6. 6. The light emitting device driving circuit with low heat generation according to claim 1, wherein the Current Source of the constant Current Source with the configurable Current comprises a Current Source IREF, an NMOS tube NM1, an NMOS tube NM2, a PMOS tube PM0, and PMOS tubes PM 1-PMN, one end of the Current Source IREF is connected with the drain electrode of the NMOS tube NM1, the gate electrode of the NMOS tube NM1 and the gate electrode of the NMOS tube NM2, the Source electrode of the NMOS tube NM1 and the Source electrode of the NMOS tube NM2 are grounded, the drain electrode of the NMOS tube NM2 is connected with the drain electrode of the PMOS tube PM0, the drain electrode of the PMOS tube PM0 and the gate electrode of the PMOS tube PM 1-PMN, the Source electrode of the PMOS tube PM0 and the Source electrode of the PMOS tube PM 1-PMN are connected with a signal VINS, and the drain electrodes of the PMOS tube PM 1-PMN sequentially output a Current I OUT1 ～I OUTN .
  7. 7. The light emitting device driving circuit with low heat generation according to claim 6, wherein the NMOS transistor NM1 and the NMOS transistor NM2 form an NMOS current mirror, a current ratio flowing through the NMOS transistor NM1 and the NMOS transistor NM2 is 1:1, the PMOS transistor PM0 and the PMOS transistors PM 1-PMN form a PMOS current mirror, a current ratio flowing through the PMOS transistor PM0 and the PMOS transistors PM 1-PMN is 1:K, and currents flowing through the PMOS transistors PM 1-PMN are equal.
  8. 8. The light emitting device driving circuit with low heat generation according to claim 1, wherein the switch SW comprises a resistor R1, a resistor R2, a comparator CMP and an NMOS tube NM3, wherein one section of the resistor R1 is connected with an input power source VIN, the other end of the resistor R1 is connected with one section of the resistor R2 and a first input end of the comparator CMP, the other end of the resistor R2 is grounded, a second input end of the comparator CMP is connected with a signal V TH , an output end of the comparator CMP is connected with a gate of the NMOS tube NM3, a drain of the NMOS tube NM3 is connected with a control end of the shared resistor R SHUNT , and a source of the NMOS tube NM3 is connected with one end of the constant current source I DRV .
  9. 9. The light emitting device driving circuit with low heat generation according to claim 1, wherein the shared resistor R SHUNT comprises a resistor R S1 , a resistor R S2 , a resistor R PULL , a diode D0 and a PMOS tube P SW , wherein one end of the resistor R S1 , one end of the resistor R PULL , a cathode of the diode D0 and a source of the PMOS tube P SW are connected with the input power VIN, the other end of the resistor R S1 is connected with one end of the resistor R S2 and a drain of the PMOS tube P SW , the other end of the resistor R S2 is connected with a signal VINS, and the other end of the resistor R PULL is connected with an anode of the diode D0 and a gate of the PMOS tube P SW and serves as a control end of the shared resistor R SHUNT .

Description

Light-emitting element driving circuit with low heating Technical Field The invention relates to a light-emitting element driving circuit, in particular to a light-emitting element driving circuit with low heat generation, and belongs to the technical field of semiconductor integrated circuits. Background The Chinese patent publication No. CN114828334A discloses a light-emitting element driving circuit, a device and electric equipment, wherein the light-emitting element driving circuit is used for driving a light-emitting element and comprises a power supply source, a shunt unit, an adjusting unit, a driving power stage and an impedance adjusting branch circuit, the shunt unit and the adjusting unit are mutually connected in parallel and are connected between a power supply source and a driving input side of the driving power stage in series, a driving output side of the driving power stage is connected with the light-emitting element, the impedance adjusting branch circuit comprises a sampling input side, a reference input side and an adjusting output side, the sampling input side is connected with the driving output side, the reference input side is connected with the driving input side, the adjusting output side is connected with an adjusting control end of the adjusting unit, and the impedance adjusting branch circuit is configured to adjust the impedance value of the adjusting unit according to a first voltage value of the sampling input side and a second voltage value of the reference input side. The light-emitting element driving circuit provided by the invention can realize the technical effects of balancing heating power, reducing self heating of the driving circuit, improving driving efficiency and driving current capacity and the like. With the requirement of a wider input voltage range of the power source VIN in practical applications, the requirement of a light emitting device for a larger current is becoming stronger. The external resistor of the shunt unit mentioned by the driving circuit is difficult to design and determine, if the resistance value is too large, the shunt effect is weakened when large current is output, and the self-heating of the driving circuit exceeds the standard. Otherwise, if the resistance is too small, the upper limit of the input power supply voltage is limited, and meanwhile, the design difficulty and cost of the impedance adjusting branch are increased. Thus, prior art solutions have difficulty covering usage scenarios with higher power requirements (higher upper supply voltage limit, larger output current). Disclosure of Invention The invention aims to provide a light-emitting element driving circuit with low heating, optimize heating and improve input/output power. In order to solve the technical problems, the invention adopts the following technical scheme: a low-heating light-emitting element driving circuit comprises a Voltage regulator Voltage Regulator, a multi-path Voltage Selector, a VIN Voltage detector VIN Monitor, a constant Current Source I DRV, a constant Current Source with configurable Current, a switch SW and a shared resistor R SHUNT, wherein the power end of the Voltage regulator Voltage Regulator, the power end of the VIN Voltage detector VIN Monitor and one end of the shared resistor R SHUNT are connected with an input power VIN, the output end of the Voltage regulator Voltage Regulator is connected with the input end of the constant Current Source Current with configurable Current and the other end of the shared resistor R SHUNT and generates a signal VINS, the N output ends of the constant Current Source Current with configurable Current are respectively connected with the N input ends of the multi-path Voltage Selector and sequentially generate signals OUT 1-OUTN, the output end of the multi-path Voltage Selector is connected with the input end of the Voltage regulator Voltage Regulator, the output end of the Voltage detector Monitor is connected with the control end of the switch SW and the other end of the switch SW is connected with one end of the constant Current Source I4225, and the other end of the constant Current Source is connected with the other end of the switch is connected with the other end of the constant Current Source I4225. Further, the Voltage regulator Voltage Regulator includes a Voltage Buffer, a main operational amplifier AMP and a built-in power tube MOS, the input end of the Voltage Buffer is connected with the output end of the multi-path Voltage Selector and inputs a signal out_smp, the output end of the Voltage Buffer is connected with the non-inverting input end of the main operational amplifier AMP and generates a signal out_buf, the output end of the main operational amplifier AMP is connected with the gate of the built-in power tube MOS and generates a signal NGATE, the drain of the built-in power tube MOS is connected with an input power source VIN, and the source of the built-in power tube MOS is connected