CN-224205285-U - DCDC constant current drive multiplexing circuit

CN224205285UCN 224205285 UCN224205285 UCN 224205285UCN-224205285-U

Abstract

The utility model relates to a DCDC constant current driving multiplexing circuit. The constant current circuit comprises a constant current circuit module, a signal input module, a current setting switching module, a load switching switch module, a first load module and a second load module, wherein the signal input module, the current setting switching module, the load switching switch module, the first load module and the second load module are respectively connected with the constant current circuit module, the current setting switching module, the load switching switch module, the first load module and the second load module, and the load switching switch module is respectively connected with the first load module and the second load module.

Inventors

ZHANG XIAOYUAN

Assignees

上海晨阑光电器件有限公司

Dates

Publication Date: 20260505
Application Date: 20250509

Claims (4)

1. The DCDC constant-current drive multiplexing circuit is characterized by comprising a constant-current circuit module, a signal input module, a current setting switching module, a load switching module, a first load module and a second load module, wherein the signal input module, the current setting switching module, the load switching module, the first load module and the second load module are respectively connected with the constant-current circuit module, the current setting switching module, the load switching module and the first load module; The current setting and switching module comprises a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1; The base electrode of the first triode Q1 is respectively connected with the base electrodes of the signal input module and the third triode Q3, the emitter electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is respectively connected with one end of the second resistor R2, one end of the fourth resistor R4 and one end of the first capacitor C1 to form a voltage output control end and is connected with the constant current circuit module, the other end of the fourth resistor R4 is a voltage input end, the other end of the first capacitor C1 is connected with the constant current circuit module, the other end of the second resistor R2 is connected with the collector electrode of the second triode Q2, the emitter electrode of the second triode Q2 is grounded, and the base electrode of the second triode Q2 is respectively connected with one end of the third resistor R3 and the collector electrode of the third triode Q3, and the other end of the third resistor R3 is a voltage input end; The load change-over switch module comprises a fourth triode Q4, a fifth triode Q5, a sixth MOS tube Q6, a seventh MOS tube Q7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; The base of the fourth triode Q4 is connected with the signal input module, the emitter of the fourth triode Q4 is grounded, the collector of the fourth triode Q4 is respectively connected with the base of the fifth triode Q5, one end of a sixth resistor R6 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is respectively connected with one end of a second capacitor C2, a voltage input end and the emitter of the fifth triode Q5, the other end of the second capacitor C2 is grounded, the other end of the sixth resistor R6 is respectively connected with one end of a third capacitor C3 and the grid of a seventh MOS tube Q7, the other end of the third capacitor C3 is grounded, the source of the seventh MOS tube Q7 is grounded, the drain of the seventh MOS tube Q7 is connected with the first load module, the collector of the fifth resistor Q5 is respectively connected with one end of a seventh resistor R7, the other end of the seventh resistor R7 is respectively connected with one end of a eighth resistor R8, the grid of the sixth resistor C6 is grounded, the other end of the eighth MOS tube Q6 is grounded, and the other end of the eighth MOS tube Q6 is grounded.
2. The DCDC constant current drive multiplexing circuit of claim 1, wherein the first load module and the second load module comprise a series light string, respectively.
3. The DCDC constant current driving multiplexing circuit according to claim 1, wherein the signal input module comprises a first signal input end, a second signal input end, a first diode D, a second diode D2, a third diode D3, a first voltage stabilizing tube Z1, a ninth resistor R9 and a fifth capacitor C5; The first signal input end corresponds to the first load module, the second signal input end corresponds to the second load module, the first signal input end is connected with the positive electrode of a first diode D1, the negative electrode of the first diode D1 is connected with the negative electrode of a second diode D2 respectively and is connected with the constant current circuit module, the positive electrode of the second diode D2 is connected with the second signal input end and the positive electrode of a third diode D3 respectively, the negative electrode of the third diode D3 is connected with the negative electrode of a first voltage stabilizing tube Z1, the positive electrode of the first voltage stabilizing tube Z1 is connected with one end of a ninth resistor R9, and the other end of the ninth resistor R9 is connected with one end of a fifth capacitor C5, a current setting switching module and a load switching switch module respectively.
4. The DCDC constant current driving multiplexing circuit according to claim 1, wherein the constant current circuit module comprises a chip U1, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, an eighth MOS transistor Q8, a first inductor L1, a second inductor L2, a Schottky diode D4, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16, wherein the chip U1 comprises a VIN pin, a PWM pin, an IMON pin, an IADJ pin, a RAMP pin, an SS pin, a DM pin, a RT pin, a COMP pin, a GATE pin, an IS pin, a GND pin, a CSN pin, an OVP pin, a SLOPE pin, a VREF pin, a VCC pin, and an EP pin; The VIN pin of the chip U1 IS respectively connected with one end of the signal input module and the sixth capacitor C6 and one end of the first inductor L1, the other end of the sixth capacitor C6 IS grounded, the other end of the first inductor L1 IS respectively connected with the drain electrode of the eighth MOS tube Q8 and one end of the seventh capacitor C7, the grid electrode of the eighth MOS tube Q8 IS connected with the GATE pin, the source electrode of the eighth MOS tube Q8 IS respectively connected with one end of the IS pin and the thirteenth resistor R13, the other end of the thirteenth resistor R13 IS grounded after being connected with the GND pin, the other end of the seventh capacitor C7 IS respectively connected with one end of the second inductor L2 and the positive electrode of the Schottky diode D4, and the other end of the second inductor L2 IS grounded; The drain pin is connected with one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is respectively connected with one end of the fifteenth capacitor C15 and one end EP pin of the fourteenth capacitor C14 and then grounded; One end of the sixteenth resistor R16 is a voltage input end, the other end of the sixteenth resistor R16 is connected with the PWM pin, the IMON pin is connected with one end of the ninth capacitor C9, the other end of the ninth capacitor C9 is respectively connected with the current setting switching module, one end of the tenth capacitor C10, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, one end of the fifteenth resistor R15 and one end of the thirteenth capacitor C13 and then grounded, the other end of the thirteenth capacitor C13 is connected with the COMP pin, the other end of the fifteenth resistor R15 is connected with the RT pin, the other end of the twelfth capacitor C12 is connected with the DM pin, the other end of the eleventh capacitor C11 is connected with the SS pin, and the other end of the tenth capacitor C10 is connected with the RAMP pin.

Description

DCDC constant current drive multiplexing circuit Technical Field The utility model relates to a car lamp circuit, in particular to a DCDC constant current driving multiplexing circuit. Background At present, a plurality of vehicle-mounted DCDC constant current chips are arranged on the market and support to control the high-low brightness switching of the same lamp panel so as to realize different functions, such as switching of daytime running lights and position lights and switching of position lights and brake lights. For such applications, the load lamp panels must be identical, and function switching, typically high and low power switching, is achieved by controlling different output duty cycles. If the display area is the same, different functions are displayed, and the high power requirement is the same, the common chip cannot support. At present, the scheme for realizing multiplexing of the high-power lamp is approximately as follows: Firstly, 2 sets of independent DCDC constant current drives are used for respectively and independently controlling corresponding functional loads, and different functions are switched according to the required priority through a peripheral logic circuit. Secondly, two sets of power devices such as power inductors, mos, flywheel tubes, input and output capacitors and the like are controlled by using a plurality of two-way DCDC constant current control chips, so that the cost of one chip is saved, and the cost advantage is not obvious; And thirdly, a set of DCDC constant voltage chip is used, and different function control is realized by adding a linear constant current circuit, so that the scheme is more applied to some dynamic lamps, but the scheme is matched with a multichannel constant current control chip, so that once the power is high, the cost is high, and the energy efficiency is not optimal. Disclosure of Invention The utility model aims to overcome the defects in the prior art and provides a DCDC constant current drive multiplexing circuit which controls a change-over switch through a simple peripheral logic circuit and realizes two different function switching on the basis of a set of DCDC constant current circuit. The DCDC constant-current driving multiplexing circuit comprises a constant-current circuit module, a signal input module, a current setting switching module, a load switching switch module, a first load module and a second load module, wherein the signal input module, the current setting switching module, the load switching switch module, the first load module and the second load module are respectively connected with the constant-current circuit module, the current setting switching module, the load switching switch module, the first load module and the second load module; The current setting and switching module comprises a first triode Q1, a second triode Q2, a third triode Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1; The base electrode of the first triode Q1 is respectively connected with the base electrodes of the signal input module and the third triode Q3, the emitter electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is respectively connected with one end of the second resistor R2, one end of the fourth resistor R4 and one end of the first capacitor C1 to form a voltage output control end and is connected with the constant current circuit module, the other end of the fourth resistor R4 is a voltage input end, the other end of the first capacitor C1 is connected with the constant current circuit module, the other end of the second resistor R2 is connected with the collector electrode of the second triode Q2, the emitter electrode of the second triode Q2 is grounded, and the base electrode of the second triode Q2 is respectively connected with one end of the third resistor R3 and the collector electrode of the third triode Q3, and the other end of the third resistor R3 is a voltage input end; The load change-over switch module comprises a fourth triode Q4, a fifth triode Q5, a sixth MOS tube Q6, a seventh MOS tube Q7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; The base of the fourth triode Q4 is connected with the signal input module, the emitter of the fourth triode Q4 is grounded, the collector of the fourth triode Q4 is respectively connected with the base of the fifth triode Q5, one end of a sixth resistor R6 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is respectively connected with one end of a second capacitor C2, a voltage input end and the emitter of the fifth triode Q5, the other end of the second capacitor C2 is grounded, the other end of the sixth resistor R6 is respectively connected w