A multiphase step-down constant current source circuit

Abstract

This invention discloses a multiphase step-down constant current source circuit, comprising: a first phase control circuit unit electrically connected to the differential amplifier circuit unit; a second phase control circuit unit electrically connected to the differential amplifier circuit unit; a first phase power output circuit unit and a second phase power output circuit unit both electrically connected to the first phase control circuit unit; a third phase power output circuit unit and a fourth phase power output circuit unit both electrically connected to the second phase control circuit unit; an output capacitor unit electrically connected to the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit; an output load electrically connected to the output capacitor unit; an output current sampling resistor electrically connected to the output load; and a current feedback transmitter circuit unit electrically connected between the differential amplifier circuit unit and the output current sampling resistor.

Description

Technical Field

[0001] This invention relates to the field of constant current source technology, and in particular to a multiphase step-down constant current source circuit. Background Technology

[0002] DC-DC power supplies are mostly used in driving semiconductor lasers or semiconductor coolers. Among them, the most common DC-DC power supply is the constant voltage source. Generally, a linear constant current circuit needs to be added to adapt well to the driving requirements of current-type semiconductors. Moreover, the overall driving efficiency is relatively low for low-voltage, high-current semiconductors, and the current is generally small. DC-DC constant current sources are also used in high-voltage LED drivers. The driving current is generally less than 20A, and the conversion efficiency is low when the input voltage is less than 1 / 2 of the output voltage.

[0003] Therefore, it is necessary to provide a novel multiphase step-down constant current source circuit to overcome the above-mentioned defects. Summary of the Invention

[0004] The purpose of this invention is to provide a multiphase step-down constant current source circuit that can provide a constant current of over 60A to drive low-voltage, high-current semiconductors, and provides an overall driving efficiency of over 80%.

[0005] To achieve the above objectives, the present invention provides a multiphase step-down constant current source circuit, comprising:

[0006] Differential amplifier circuit unit;

[0007] A first phase control circuit unit, which is electrically connected to the differential amplifier circuit unit; and a second phase control circuit unit, which is electrically connected to the differential amplifier circuit unit.

[0008] The system includes: a first-phase power output circuit unit; a second-phase power output circuit unit, both of which are electrically connected to the first-phase control circuit unit; a third-phase power output circuit unit; and a fourth-phase power output circuit unit, both of which are electrically connected to the second-phase control circuit unit.

[0009] An output capacitor unit is electrically connected to the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit.

[0010] An output load, which is electrically connected to the output capacitor unit;

[0011] An output current sampling resistor R800 is electrically connected to the output load; a current feedback transmitter circuit unit is electrically connected between the differential amplifier circuit unit and the output current sampling resistor R800.

[0012] Preferably, the differential amplifier circuit unit includes resistor R7, capacitor C7, resistor R4, capacitor C2, capacitor C6, resistor R15, resistor R16, analog switch S1, resistor R12, capacitor C14, Zener diode D7, operational amplifier U3, resistor R9, Zener diode D3, and capacitor C10.

[0013] The first end of resistor R7 is electrically connected to the current feedback transmitter circuit unit and the first end of capacitor C7. The second end of resistor R7 is electrically connected to the second end of capacitor C7, the first end of resistor R4, and the inverting input of operational amplifier U3. The second end of resistor R4 is electrically connected to the first end of capacitor C2. The second end of capacitor C2 is electrically connected to the first end of resistor R9, the cathode of Zener diode D3, and the first end of capacitor C10. The second end of resistor R9 is electrically connected to the output of operational amplifier U3. The second end of capacitor C10 is electrically connected to the anode of Zener diode D3 and grounded. One power input terminal of operational amplifier U3 is electrically connected to capacitor C6 and an external 5V power supply. Capacitor C6 is grounded. The other power input terminal of operational amplifier U3 is grounded.

[0014] The first end of resistor R16 is used to connect the given PWM analog modulation voltage signal. The second end of resistor R16 is electrically connected to the first end of resistor R15 and the SNO pin of analog switch S1. The second end of resistor R15 is electrically connected to the COM pin of analog switch S1. Analog switch S1 connects the given analog voltage signal. Analog switch S1 is electrically connected to the first end of resistor R12. The second end of resistor R12 is electrically connected to the non-inverting input terminal of operational amplifier U3, the first end of capacitor C14, and the cathode of Zener diode D7. The GND pin of analog switch S1 is electrically connected to the second end of capacitor C14 and the anode of Zener diode D7. Resistor R9 is electrically connected to the first phase control circuit unit and the second phase control circuit unit.

[0015] Preferably, the first phase control circuit unit includes a first phase controller, capacitor C30, diode D4, diode D5, polarized capacitor C29, voltage regulator chip U30, resistor R5, capacitor C21, resistor R6, resistor R3, capacitor C15, capacitor C13, capacitor C8, resistor R2, resistor R4, capacitor C14, capacitor C333, capacitor C111, Schottky diode D1, and Schottky diode D11.

[0016] The first terminal of capacitor C30 is connected to a 12V external power supply. The second terminal of capacitor C30 is electrically connected to the cathode of diode D5 and the negative terminal of polarized capacitor C29. The anode of diode D5 is electrically connected to the cathode of diode D4. The anode of diode D4 is electrically connected to the GND pin of voltage regulator chip U30. The INOUT pin of voltage regulator chip U30 is electrically connected to the first terminal of capacitor C30. Voltage regulator chip U30 is electrically connected to the polarized capacitor C29 and the first terminal of resistor R6. The second terminal of resistor R6 is electrically connected to the first terminal of resistor R5, the first terminal of capacitor C21, and the PLLFLTR pin of the first phase controller.

[0017] The second terminal of resistor R5 is electrically connected to the second terminal of capacitor C21, the first terminal of resistor R3, the first terminal of capacitor C15, and the first terminal of capacitor C8. The second terminal of resistor R3 is electrically connected to the first terminals of capacitors C13 and C15. The second terminal of capacitor C13 is electrically connected to the TTH pin of the first phase controller. The second terminal of capacitor C8 is electrically connected to the RUN / SS pin of the first phase controller.

[0018] The first end of resistor R2 is electrically connected to the Vdiffout pin of the first phase controller and the first end of capacitor C14. The second end of resistor R2 is electrically connected to the second end of capacitor C14, the first end of resistor R4, and the EAIN pin of the first phase controller. The second end of resistor R4 is grounded. The Vos- pin of the first phase controller is electrically connected to resistor R9 of the differential amplifier circuit unit.

[0019] The EXTVcc pin of the first phase controller is electrically connected to a 6.5V external power supply and also electrically connected to capacitor C333, which is grounded. The SENSE1- pin of the first phase controller is electrically connected to the first terminal of capacitor C111 and connected to the first phase power output circuit unit. The SENSE1+ pin of the first phase controller is electrically connected to the second terminal of capacitor C111 and connected to the first phase power output circuit unit. The Vos+ pin of the first phase controller is electrically connected to the first terminal of capacitor C22, and the Vos- pin of the first phase controller is electrically connected to the second terminal of capacitor C22.

[0020] The SW1 pin of the first phase controller is electrically connected to the first terminal of capacitor C5. The BOOST1 pin of the first phase controller is electrically connected to the second terminal of capacitor C5 and the cathode of Schottky diode D1. The anode of Schottky diode D1 is electrically connected to the anode of Schottky diode D11. The cathode of Schottky diode D11 is electrically connected to the BOOST2 pin of the first phase controller and the first terminal of capacitor C19. The second terminal of capacitor C19 is electrically connected to the SW2 pin of the first phase controller. The INTVcc pin of the first phase controller is electrically connected to the first terminal of capacitor C11 and the positive terminal of polarized capacitor C16. The second terminal of capacitor C11 is electrically connected to the negative terminal of polarized capacitor C16.

[0021] The SENSE2+ pin of the first phase controller is electrically connected to the first terminal of capacitor C23 and connected to the second phase power output circuit unit. The SENSE2- pin of the first phase controller is electrically connected to the second terminal of capacitor C23 and connected to the second phase power output circuit unit.

[0022] The Vin pin of the first phase controller is electrically connected to the first end of capacitor C25, the positive terminal of polarized capacitor C27, and the first end of resistor R8. The AMPMD pin of the first phase controller is electrically connected to the second end of capacitor C25 and grounded. The negative terminal of polarized capacitor C27 is grounded. The second end of resistor R8 is connected to a 12V external power supply.

[0023] Preferably, the second phase control circuit unit includes a second phase controller, capacitor C4, capacitor C20, Schottky diode D2, Schottky diode D20, and capacitor C6;

[0024] The EXTVcc pin of the second phase controller is electrically connected to capacitor C4 and to the 6.5V external power supply on the first phase controller. Capacitor C4 is grounded. The SENSE1- pin of the second phase controller is electrically connected to the first terminal of capacitor C2 and connected to the third phase power output circuit unit. The SENSE1+ pin of the second phase controller is electrically connected to the second terminal of capacitor C2 and connected to the third phase power output circuit unit. The Vos+ pin and the Vos- pin of the second phase controller are grounded.

[0025] The SW1 pin of the second phase controller is electrically connected to the first terminal of capacitor C6. The BOOST1 pin of the second phase controller is electrically connected to the second terminal of capacitor C6 and the cathode of Schottky diode D2. The anode of Schottky diode D2 is electrically connected to the anode of Schottky diode D20. The cathode of Schottky diode D20 is electrically connected to the BOOST2 pin of the second phase controller and the first terminal of capacitor C20. The second terminal of capacitor C20 is electrically connected to the SW2 pin of the second phase controller.

[0026] The INTVcc pin of the second phase controller is electrically connected to the first terminal of capacitor C12 and the positive terminal of polarized capacitor C17. The second terminal of capacitor C12 is electrically connected to the negative terminal of polarized capacitor C17 and grounded. The SENSE2+ pin of the second phase controller is electrically connected to the first terminal of capacitor C24 and connected to the fourth phase power output circuit unit. The SENSE2- pin of the second phase controller is electrically connected to the second terminal of capacitor C24 and connected to the fourth phase power output circuit unit.

[0027] The Vin pin of the second phase controller is electrically connected to the first terminal of capacitor C26 and IC-VCC, and the second terminal of capacitor C26 is electrically connected to the AMPMD pin of the second phase controller and grounded.

[0028] The EAIN pin of the second phase controller is electrically connected to the first terminal of capacitor C7. The second terminal of capacitor C7 is electrically connected to the first terminals of capacitors C9, C10, and C18 and grounded. The second terminal of capacitor C9 is electrically connected to the first terminal of resistor R1. The second terminal of resistor R1 is electrically connected to the PLLFLTR pin of the second phase controller and the second terminal of capacitor C10. The second terminal of capacitor C18 is electrically connected to the ITH pin of the second phase controller. The CLKOUTA pin of the second phase controller is electrically connected to the CLKOUTA pin of the first phase controller. The EAIN pin of the second phase controller is electrically connected to the EAIN pin of the first phase controller.

[0029] Preferably, the first phase power output circuit unit includes a sampling resistor P1, an inductor L1, a resistor R101, a resistor R201, a MOSFET Q1, a first Zener diode D101, a capacitor C501, a polarized capacitor C701, a polarized capacitor C36, a resistor R401, a MOSFET Q2, a second Zener diode D102, a MOSFET Q3, a third Zener diode D103, a capacitor C201, a resistor R301, and a first Schottky diode D100;

[0030] The first terminal of the sampling resistor P1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the sampling resistor P1 is electrically connected to the SENSE1- pin of the first phase controller. The first terminal of the inductor L1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the inductor L1 is electrically connected to the SW1 pin of the first phase controller, resistor R101, the source of MOSFET Q1, and the anode of the first Zener diode D101. The second terminal of resistor R101 is connected to resistor R... The first terminal of resistor R201 is electrically connected to the gate of MOSFET Q1. The drain of MOSFET Q1 is electrically connected to the first terminal of capacitor C501, the positive terminal of polarized capacitor C701, the cathode of first Zener diode D101, and the positive terminal of polarized capacitor C36. The second terminal of resistor R201 is electrically connected to the TG1 pin of the first phase controller. The second terminal of capacitor C501 is electrically connected to the negative terminals of polarized capacitors C7 and C36. The positive terminal of polarized capacitor C7 is connected to the external power supply VCC.

[0031] The first terminal of resistor R401 is electrically connected to the BG1 pin of the first phase controller, the gate of MOSFET Q2, and the gate of MOSFET Q3. The drain of MOSFET Q2 is electrically connected to the drain of MOSFET Q3, the SW1 pin of the first phase controller, the first terminal of capacitor C201, and the cathode of the first Schottky diode D100. The second terminal of resistor R401 is electrically connected to the source of MOSFET Q2, the source of MOSFET Q3, and the negative terminal of polarized capacitor C36. The anode of the second Zener diode D102 is electrically connected to the source of MOSFET Q2, and the cathode of the second Zener diode D102 is electrically connected to the drain of MOSFET Q2. The anode of the third Zener diode D103 is electrically connected to the source of MOSFET Q3, and the cathode of the third Zener diode D103 is electrically connected to the drain of MOSFET Q3.

[0032] The first end of the resistor R301 is electrically connected to the second end of the capacitor C201. The second end of the resistor R301 is electrically connected to the negative terminal of the polarized capacitor C36, the anode of the first Schottky diode D100, and the second end of the sampling resistor P1. The negative terminal of the polarized capacitor C36 is grounded.

[0033] Preferably, the second phase power output circuit unit includes a sampling resistor P2, an inductor L2, a resistor R701, a resistor R801, a MOSFET Q4, a fourth Zener diode D104, a polarized capacitor C901, a capacitor C110, a resistor R501, a MOSFET Q5, a fifth Zener diode D105, a MOSFET Q6, a sixth Zener diode D106, a resistor R601, a capacitor C140, and a second Schottky diode D200;

[0034] The first terminal of the sampling resistor P2 is electrically connected to the SENSE2+ pin of the first phase controller, and the second terminal of the sampling resistor P2 is electrically connected to the SENSE2- pin of the first phase controller. The first terminal of the inductor L2 is electrically connected to the first terminal of the sampling resistor P2. The second terminal of the inductor L2 is electrically connected to SW2 of the first phase controller, the first terminal of resistor R801, and the source of MOSFET Q4. The second terminal of resistor R801 is electrically connected to the first terminal of resistor R701 and the gate of MOSFET Q4. The second terminal of resistor R701 is electrically connected to the TG2 pin of the first phase controller. The drain of MOSFET Q4 is electrically connected to the first terminal of capacitor C110, the positive terminal of polarized capacitor C901, and the external power supply VCC. The anode of the fourth Zener diode D104 is electrically connected to the source of MOSFET Q4, and the cathode of the fourth Zener diode D104 is electrically connected to the drain of MOSFET Q4.

[0035] The second terminal of capacitor C110 is electrically connected to the negative terminal of polarized capacitor C901, which is grounded. The first terminal of resistor R501 is electrically connected to the source of MOSFET Q5, the source of MOSFET Q6, the negative terminal of polarized capacitor C901, the first terminal of resistor R601, the anode of the second Schottky diode D200, and the second terminal of sampling resistor P2. The second terminal of resistor R501 is electrically connected to the gate of MOSFET Q5, the BG2 pin of the first phase controller, and the gate of MOSFET Q6. The drain of MOSFET Q5 is connected to the drain of MOSFET Q6. The drain of the first phase controller, the SW2 pin of the first phase controller, the first terminal of the capacitor C140, and the cathode of the second Schottky diode D200 are electrically connected. The second terminal of the resistor R601 is electrically connected to the second terminal of the capacitor C140. The anode of the fifth Zener diode D105 is electrically connected to the source of the MOSFET Q5, and the cathode of the fifth Zener diode D105 is electrically connected to the drain of the MOSFET Q5. The anode of the sixth Zener diode D106 is electrically connected to the source of the MOSFET Q6, and the cathode of the sixth Zener diode D106 is electrically connected to the drain of the MOSFET Q6.

[0036] Preferably, the third-phase power output circuit unit includes a sampling resistor P3, an inductor L3, a resistor R901, a resistor R100, a MOSFET Q7, a seventh Zener diode D107, a capacitor C190, a polarized capacitor C210, a polarized capacitor C37, a resistor R120, a MOSFET Q8, an eighth Zener diode D108, a MOSFET Q9, a ninth Zener diode D109, a capacitor C160, a resistor R110, and a third Schottky diode D300;

[0037] The first terminal of the sampling resistor P3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the sampling resistor P3 is electrically connected to the SENSE1- pin of the second phase controller. The first terminal of the inductor L3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the inductor L3 is electrically connected to the SW1 pin of the second phase controller, the first terminal of resistor R901, the source of MOSFET Q7, and the anode of the seventh Zener diode D107. The second terminal of resistor R901 is connected to resistor R... The first terminal of resistor R100 is electrically connected to the gate of MOSFET Q7. The drain of MOSFET Q7 is electrically connected to the first terminal of capacitor C190, the positive terminal of polarized capacitor C210, the cathode of the seventh Zener diode D107, and the positive terminal of polarized capacitor C37. The second terminal of resistor R100 is electrically connected to the TG1 pin of the second phase controller. The second terminal of capacitor C190 is electrically connected to the negative terminals of polarized capacitors C210 and C37. The positive terminal of polarized capacitor C210 is connected to the external power supply VCC.

[0038] The first terminal of resistor R120 is electrically connected to the BG1 pin of the second phase controller, the gate of MOSFET Q8, and the gate of MOSFET Q9. The drain of MOSFET Q8 is electrically connected to the drain of MOSFET Q9, the SW1 pin of the second phase controller, the first terminal of capacitor C160, and the cathode of the third Schottky diode D300. The second terminal of resistor R120 is electrically connected to the source of MOSFET Q8, the source of MOSFET Q9, and the negative terminal of polarized capacitor C37. The anode of the eighth Zener diode D108 is electrically connected to the source of MOSFET Q8, and the cathode of the eighth Zener diode D108 is electrically connected to the drain of MOSFET Q8. The anode of the ninth Zener diode D109 is electrically connected to the source of MOSFET Q9, and the cathode of the ninth Zener diode D109 is electrically connected to the drain of MOSFET Q9.

[0039] The first end of the resistor R110 is electrically connected to the second end of the capacitor C160, the second end of the resistor R110 is electrically connected to the negative terminal of the polarized capacitor C37, the anode of the first Schottky diode D300 is electrically connected to the second end of the resistor R110 and the second end of the sampling resistor P3, and the negative terminal of the polarized capacitor C37 is grounded.

[0040] Preferably, the fourth phase power output circuit unit includes a sampling resistor P4, an inductor L4, a resistor R160, a resistor R150, a MOSFET Q10, a tenth Zener diode D210, a polarized capacitor C230, a capacitor C250, a resistor R130, a MOSFET Q11, an eleventh Zener diode D211, a MOSFET Q12, a twelfth Zener diode D212, a resistor R140, a capacitor C280, and a fourth Schottky diode D400.

[0041] The first terminal of the sampling resistor P4 is electrically connected to the SENSE2+ pin of the second phase controller, and the second terminal of the sampling resistor P4 is electrically connected to the SENSE2- pin of the second phase controller. The first terminal of the inductor L4 is electrically connected to the first terminal of the sampling resistor P4. The second terminal of the inductor L4 is electrically connected to SW2 of the second phase controller, the first terminal of resistor R160, and the source of MOSFET Q10. The second terminal of resistor R160 is electrically connected to the first terminal of resistor R150 and the gate of MOSFET Q10. The second terminal of resistor R150 is electrically connected to the TG2 pin of the second phase controller. The drain of MOSFET Q10 is electrically connected to the first terminal of capacitor C250, the positive terminal of polarized capacitor C230, and the external power supply VCC. The anode of the tenth Zener diode D210 is electrically connected to the source of MOSFET Q10, and the cathode of the tenth Zener diode D210 is electrically connected to the drain of MOSFET Q10.

[0042] The second terminal of capacitor C250 is electrically connected to the negative terminal of polarized capacitor C230, which is grounded. The first terminal of resistor R130 is electrically connected to the source of MOSFET Q11, the source of MOSFET Q12, the negative terminal of polarized capacitor C230, the first terminal of resistor R140, the anode of fourth Schottky diode D400, and the second terminal of sampling resistor P4. The second terminal of resistor R130 is electrically connected to the gate of MOSFET Q11, the BG2 pin of the second phase controller, and the gate of MOSFET Q12. The drain of MOSFET Q11 is electrically connected to the drain of MOSFET Q12, the SW2 pin of the second phase controller, the first terminal of capacitor C280, and the cathode of fourth Schottky diode D400. The second terminal of resistor R140 is electrically connected to the second terminal of capacitor C280.

[0043] The anode of the eleventh Zener diode D211 is electrically connected to the source of the MOSFET Q11, and the cathode of the eleventh Zener diode D211 is electrically connected to the drain of the MOSFET Q11. The anode of the twelfth Zener diode D212 is electrically connected to the source of the MOSFET Q12, and the cathode of the twelfth Zener diode D212 is electrically connected to the drain of the MOSFET Q12.

[0044] Preferably, the output capacitor unit includes capacitor C1, polarized capacitor C4, capacitor C3, polarized capacitor C6, capacitor C12, polarized capacitor C8, capacitor C13, polarized capacitor C10, capacitor C15, polarized capacitor C18, capacitor C17, polarized capacitor C20, capacitor C26, polarized capacitor C22, capacitor C27, and polarized capacitor C24.

[0045] The first terminal of capacitor C1 is electrically connected to the positive terminal of polarized capacitor C4, the first terminal of capacitor C3, the positive terminal of polarized capacitor C6, the first terminal of capacitor C12, the positive terminal of polarized capacitor C8, the first terminal of capacitor C13, the positive terminal of polarized capacitor C10, the first terminal of capacitor C15, the positive terminal of polarized capacitor C18, the first terminal of capacitor C17, the positive terminal of polarized capacitor C20, the first terminal of capacitor C26, the positive terminal of polarized capacitor C22, the first terminal of capacitor C27, and the positive terminal of polarized capacitor C24.

[0046] The second terminal of capacitor C1 is electrically connected to the negative terminal of polarized capacitor C4, the second terminal of capacitor C3, the negative terminal of polarized capacitor C6, the second terminal of capacitor C12, the negative terminal of polarized capacitor C8, the second terminal of capacitor C13, and the negative terminal of polarized capacitor C10. The second terminal of capacitor C15, the negative terminal of polarized capacitor C18, the second terminal of capacitor C17, the negative terminal of polarized capacitor C20, the second terminal of capacitor C26, the negative terminal of polarized capacitor C22, the second terminal of capacitor C27, and the negative terminal of polarized capacitor C24 are electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C1 is also electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C13 is also electrically connected to the second terminal of the sampling resistor P2. The first terminal of capacitor C15 is also electrically connected to the second terminal of the sampling resistor P3. The first terminal of capacitor C27 is also electrically connected to the second terminal of the sampling resistor P4.

[0047] Preferably, the output load includes a plurality of laser diodes, the anodes of the plurality of laser diodes being electrically connected to the positive terminal of the polarized capacitor C10, the cathodes of the plurality of laser diodes being electrically connected to the first terminal of the output current sampling resistor R800, and the second terminal of the output current sampling resistor R800 being electrically connected to the current feedback transmitter circuit unit.

[0048] Preferably, the current feedback transmitter circuit unit includes a resistor R5.0, a capacitor C4.0, a thirteenth Zener diode D130, a capacitor C9.0, a resistor R2.0, a resistor R1.0, a microcontroller U100, a capacitor C3.0, a resistor R1.2, a capacitor C1.1, a fourteenth Zener diode D140, a variable resistor R1.1, a capacitor C1.2, a capacitor C1.3, and a diode D6;

[0049] The first terminal of resistor R5.0 is electrically connected to the first terminal of the output current sampling resistor R800. The second terminal of resistor R5.0 is electrically connected to the first terminal of capacitor C4.0, the cathode of the thirteenth Zener diode D130, the first terminal of capacitor C9.0, and the IN- pin of microcontroller U100. The second terminal of capacitor C4.0 is electrically connected to the anode of the thirteenth Zener diode D130 and grounded. The first terminal of resistor R1.0 is electrically connected to the second terminal of the output current sampling resistor R800. The second terminal of resistor R1.0 is electrically connected to the first terminal of capacitor C1.1, the cathode of the fourteenth Zener diode D140, the second terminal of capacitor C9.0, and the IN+ pin of microcontroller U100. The second terminal of capacitor C1.1 is electrically connected to the anode of the fourteenth Zener diode D140 and grounded.

[0050] The first terminal of resistor R2.0 is electrically connected to the first terminal of variable resistor R1.1. The second terminal of resistor R2.0 is electrically connected to one J pin of microcontroller U100. The second terminal of variable resistor R1.1 is electrically connected to the other J pin of microcontroller U100. The +V pin of microcontroller U100 is electrically connected to the first terminal of capacitor C3.0 and the 5V power supply of the differential amplifier circuit. The OUT pin of microcontroller U100 is electrically connected to the first terminal of resistor R7. The REF pin of microcontroller U100 is electrically connected to the first terminals of resistor R1.2, capacitor C1.2, capacitor C1.3, and the anode of diode D6.

[0051] The second terminal of the resistor R1.2 is electrically connected to the second terminal of the capacitor C1.2 and grounded. The cathode of the diode D6 is electrically connected to the second terminal of the capacitor C1.3 and the 5V power supply of the differential amplifier circuit.

[0052] Compared with existing technologies, the beneficial effects are as follows: When the given operating current is constant, if the current becomes too large due to some interference, the current passing through the output current sampling resistor will increase accordingly. The output current sampling resistor outputs a voltage signal of the corresponding proportion to the current feedback transmitter circuit unit. The current feedback transmitter circuit unit outputs an amplified signal to the inverting input terminal of the differential amplifier circuit unit, thereby reducing the output voltage of the differential amplifier circuit unit. This, in turn, reduces the current of the output load through the first phase control circuit unit, the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit. The multiphase step-down constant current circuit provided by this invention can meet the constant current drive output load (low-voltage high-current semiconductor) of 60A or more, and the overall drive efficiency reaches more than 80%. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 The schematic diagram of the multiphase step-down constant current source circuit provided by the present invention.

[0055] Figure 2 for Figure 1 The circuit diagram of the differential amplifier circuit unit shown is shown.

[0056] Figure 3 for Figure 1 The circuit diagram of the first phase control circuit unit is shown.

[0057] Figure 4 for Figure 1 The circuit diagram of the second phase control circuit unit is shown.

[0058] Figure 5 for Figure 1 The circuit diagram of the first phase power output circuit unit is shown.

[0059] Figure 6 for Figure 1 The circuit diagram of the second-phase power output circuit unit is shown.

[0060] Figure 7 for Figure 1 The circuit diagram of the third-phase power output circuit unit is shown.

[0061] Figure 8 for Figure 1The circuit diagram of the fourth phase power output circuit unit is shown.

[0062] Figure 9 for Figure 1 The circuit diagram of the output capacitor unit is shown.

[0063] Figure 10 for Figure 1 The circuit diagram of the current feedback transmitter circuit unit is shown. Detailed Implementation

[0064] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the invention and are not intended to limit the invention.

[0065] It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0066] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a connection within two components or an interaction between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features; "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0068] Please see Figures 1 to 10 This invention provides a multiphase step-down constant current source circuit, comprising:

[0069] Differential amplifier circuit unit;

[0070] The first phase control circuit unit is electrically connected to the differential amplifier circuit unit;

[0071] The second phase control circuit unit is electrically connected to the differential amplifier circuit unit;

[0072] First phase power output circuit unit;

[0073] The second phase power output circuit unit is electrically connected to the first phase control circuit unit.

[0074] Third-phase power output circuit unit;

[0075] The fourth phase power output circuit unit, wherein both the third phase power output circuit unit and the fourth phase power output circuit unit are electrically connected to the second phase control circuit unit;

[0076] An output capacitor unit is electrically connected to the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit.

[0077] An output load, which is electrically connected to the output capacitor unit;

[0078] The output current sampling resistor R800 is electrically connected to the output load.

[0079] A current feedback transmitter circuit unit is electrically connected between the differential amplifier circuit unit and the output current sampling resistor R800.

[0080] A PWM analog modulated voltage signal is given at the positive input terminal of the differential amplifier circuit unit. It passes through the first phase control circuit unit, the second phase control circuit unit, the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, the fourth phase power output circuit unit, the output load, the output current sampling resistor R800, and finally the voltage signal corresponding to the output load current after being amplified by the current feedback transmitter circuit unit is input to the inverting input terminal of the differential amplifier circuit unit.

[0081] The differential amplifier circuit unit compares two voltage signals at its input to generate a deviation signal, which controls the first-phase control circuit unit to output two currents of different phases through the first-phase power output circuit unit and the second-phase power output circuit unit. Simultaneously, it also controls the second-phase control circuit unit to output two currents of different phases through the third-phase power output circuit unit and the fourth-phase power output circuit unit. After the current is output to the output load...

[0082] Then, a large current that meets the operating requirements of the output load is synthesized through the output capacitor. When the given operating current is constant, if the current becomes too large due to some interference, the current through the output current sampling resistor R800 will increase accordingly. The output current sampling resistor R800 outputs a voltage signal of the corresponding proportion to the current feedback transmitter circuit unit. The current feedback transmitter circuit unit outputs the amplified signal to the inverting input terminal of the differential amplifier circuit unit, thereby reducing the output voltage of the differential amplifier circuit unit. This, in turn, reduces the current of the output load through the first phase control circuit unit, the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit. The multiphase step-down constant current circuit provided by this invention can meet the constant current drive output load (low voltage high current type semiconductor) of 60A or more, and the overall drive efficiency reaches more than 80%.

[0083] Furthermore, the differential amplifier circuit unit includes resistor R7, capacitor C7, resistor R4, capacitor C2, capacitor C6, resistor R15, resistor R16, analog switch S1, resistor R12, capacitor C14, Zener diode D7, operational amplifier U3, resistor R9, Zener diode D3, and capacitor C10.

[0084] The first end of resistor R7 is electrically connected to the current feedback transmitter circuit unit (receiving the voltage signal corresponding to the sampling current output by the current feedback transmitter circuit unit) and the first end of capacitor C7. The second end of resistor R7 is electrically connected to the second end of capacitor C7, the first end of resistor R4, and the inverting input terminal (-) of operational amplifier U3. The second end of resistor R4 is electrically connected to the first end of capacitor C2. The second end of capacitor C2 is electrically connected to the first end of resistor R9, the cathode of Zener diode D3, and the first end of capacitor C10. The second end of resistor R9 is electrically connected to the output terminal of operational amplifier U3. The second end of capacitor C10 is electrically connected to the anode of Zener diode D3 and grounded. One power input terminal of operational amplifier U3 is electrically connected to capacitor C6 and an external 5V power supply. Capacitor C6 is grounded. The other power input terminal of operational amplifier U3 is grounded.

[0085] The first end of resistor R16 is used to connect the given PWM analog modulation voltage signal. The second end of resistor R16 is electrically connected to the first end of resistor R15 and the SNO pin of analog switch S1. The second end of resistor R15 is electrically connected to the COM pin of analog switch S1. Analog switch S1 connects the given analog voltage signal. Analog switch S1 is electrically connected to the first end of resistor R12. The second end of resistor R12 is electrically connected to the non-inverting input (+) of operational amplifier U3, the first end of capacitor C14, and the cathode of Zener diode D7. The GND pin of analog switch S1 is electrically connected to the second end of capacitor C14 and the anode of Zener diode D7. Resistor R9 is electrically connected to the first phase control circuit unit and the second phase control circuit unit.

[0086] Thus, the PWM analog modulated voltage signal (LD-P) is adjusted by the analog voltage signal (LD-V) through the analog switch S1. The modulated PWM analog modulated voltage signal is transmitted to the non-inverting input terminal (+) of the operational amplifier U3 through the analog switch S1. The resistor R12 and capacitor C14 form a low-pass filter for the non-inverting input terminal (+). The Zener diode D7 protects the non-inverting input terminal (+).

[0087] The voltage signal (IOUT) corresponding to the sampled current output by the current feedback transmitter circuit unit forms a differential amplifier circuit with analog PID controller regulation through capacitor C7, resistor R7, resistor R4, capacitor C2 and the inverting input terminal (-) of operational amplifier U3. The voltage signal (IOUT) corresponding to the sampled current output by the current feedback transmitter circuit unit follows the PWM analog modulation voltage signal. The pulse width and amplitude of the PWM analog modulation voltage signal change, and the voltage signal (IOUT) corresponding to the sampled current output by the current feedback transmitter circuit unit also changes accordingly. The voltage signal output by the output terminal of operational amplifier U3 is converted into the TRIM signal of the first phase control circuit unit and the second phase control circuit unit through resistor R9. Resistor R9 and capacitor C10 constitute a low-pass filter at the output terminal of operational amplifier, and Zener diode D10 protects the output terminal of operational amplifier.

[0088] Furthermore, the first phase control circuit unit includes a first phase controller, capacitor C30, diode D4, diode D5, polarized capacitor C29, voltage regulator chip U30, resistor R5, capacitor C21, resistor R6, resistor R3, capacitor C15, capacitor C13, capacitor C8, resistor R2, resistor R4, capacitor C14, capacitor C333, capacitor C111, Schottky diode D1, and Schottky diode D11.

[0089] The first terminal of capacitor C30 is connected to a 12V external power supply. The second terminal of capacitor C30 is electrically connected to the cathode of diode D5 and the negative terminal of polarized capacitor C29. The anode of diode D5 is electrically connected to the cathode of diode D4. The anode of diode D4 is electrically connected to the GND pin of voltage regulator chip U30. The INOUT pin of voltage regulator chip U30 is electrically connected to the first terminal of capacitor C30. Voltage regulator chip U30 is electrically connected to the polarized capacitor C29 and the first terminal of resistor R6. The second terminal of resistor R6 is electrically connected to the first terminal of resistor R5, the first terminal of capacitor C21, and the PLLFLTR pin of the first phase controller.

[0090] The second terminal of resistor R5 is electrically connected to the second terminal of capacitor C21, the first terminal of resistor R3, the first terminal of capacitor C15, and the first terminal of capacitor C8. The second terminal of resistor R3 is electrically connected to the first terminals of capacitors C13 and C15. The second terminal of capacitor C13 is electrically connected to the TTH pin of the first phase controller. The second terminal of capacitor C8 is electrically connected to the RUN / SS pin of the first phase controller.

[0091] The first end of resistor R2 is electrically connected to the Vdiffout pin of the first phase controller and the first end of capacitor C14. The second end of resistor R2 is electrically connected to the second end of capacitor C14, the first end of resistor R4, and the EAIN pin of the first phase controller. The second end of resistor R4 is grounded. The Vos- pin of the first phase controller is electrically connected to resistor R9 of the differential amplifier circuit unit.

[0092] The EXTVcc pin of the first phase controller is electrically connected to a 6.5V external power supply and also electrically connected to capacitor C333, which is grounded. The SENSE1- pin of the first phase controller is electrically connected to the first terminal of capacitor C111 and connected to the first phase power output circuit unit. The SENSE1+ pin of the first phase controller is electrically connected to the second terminal of capacitor C111 and connected to the first phase power output circuit unit. The Vos+ pin of the first phase controller is electrically connected to the first terminal of capacitor C22, and the Vos- pin of the first phase controller is electrically connected to the second terminal of capacitor C22.

[0093] The SW1 pin of the first phase controller is electrically connected to the first terminal of capacitor C5. The BOOST1 pin of the first phase controller is electrically connected to the second terminal of capacitor C5 and the cathode of Schottky diode D1. The anode of Schottky diode D1 is electrically connected to the anode of Schottky diode D11. The cathode of Schottky diode D11 is electrically connected to the BOOST2 pin of the first phase controller and the first terminal of capacitor C19. The second terminal of capacitor C19 is electrically connected to the SW2 pin of the first phase controller. The INTVcc pin of the first phase controller is electrically connected to the first terminal of capacitor C11 and the positive terminal of polarized capacitor C16. The second terminal of capacitor C11 is electrically connected to the negative terminal of polarized capacitor C16.

[0094] The SENSE2+ pin of the first phase controller is electrically connected to the first terminal of capacitor C23 and connected to the second phase power output circuit unit. The SENSE2- pin of the first phase controller is electrically connected to the second terminal of capacitor C23 and connected to the second phase power output circuit unit.

[0095] The Vin pin of the first phase controller is electrically connected to the first end of capacitor C25, the positive terminal of polarized capacitor C27, and the first end of resistor R8. The AMPMD pin of the first phase controller is electrically connected to the second end of capacitor C25 and grounded. The negative terminal of polarized capacitor C27 is grounded. The second end of resistor R8 is connected to a 12V external power supply.

[0096] Thus, capacitor C30, diodes D4 and D5, voltage regulator chip U30, and capacitor C29 constitute a three-terminal voltage regulator circuit with a 12V input and 6.5V output for the first phase controller. This provides external power to the low-side MOSFET drive circuits of the first and second phase control circuit units. Simultaneously, a voltage divider circuit formed by resistor R5, capacitor C21, and resistor R6 provides power to the PLLPF pin of the first phase controller.

[0097] The operating frequency of the first phase controller is set to 300KHz. Resistor R3, capacitor C15, and capacitor C13 are connected to the ITH pin of the first phase controller to form the output and compensation point of the phase control.

[0098] Capacitors C111 and C23 serve as filter capacitors for the first phase controller; capacitors C25 and C27, along with resistor R8, constitute the power supply decoupling circuit for the first phase controller; Schottky diodes D1 and D11, along with capacitors C5 and C19, respectively form the bootstrap drive circuits for the high-side MOSFETs of phase one and two phases; capacitors C11 and C16 serve as internal 5V decoupling capacitors for the phase controller; capacitor C333 serves as a filter capacitor for the external drive power supply; capacitor C8 is connected to the RUN / SS pin to set the soft-start time; capacitor C22 is the input filter capacitor for the differential amplifier; resistors R4, R2, and C14 are connected to the output of the differential amplifier and the input of the error comparator, forming a voltage divider circuit to provide error correction. The comparator's EAIN pin provides the error current signal. The TRIM signal and the Sense+ signal are output to the Vidffout pin of the first phase controller through the internal differential amplifier, and then input to the EAIN pin through the connected error comparator. When the TRIM signal decreases, the voltage at the Vidffout pin after passing through the differential amplifier increases, and the voltage at the EAIN pin after voltage division increases relatively, causing the voltage at the EAIN pin to rise slightly relative to the internal 0.8V reference voltage. This, in turn, causes the ITH voltage to decrease. The error amplifier accelerates the low-level output time of TG1A and TG2A in each working cycle, thereby turning off the high-side MOSFETs earlier, so that the phase current eventually decreases.

[0099] Furthermore, the second phase control circuit unit includes a second phase controller, capacitor C4, capacitor C20, Schottky diode D2, Schottky diode D20, and capacitor C6;

[0100] The EXTVcc pin of the second phase controller is electrically connected to capacitor C4 and to the 6.5V external power supply on the first phase controller. Capacitor C4 is grounded. The SENSE1- pin of the second phase controller is electrically connected to the first terminal of capacitor C2 and connected to the third phase power output circuit unit. The SENSE1+ pin of the second phase controller is electrically connected to the second terminal of capacitor C2 and connected to the third phase power output circuit unit. The Vos+ pin and the Vos- pin of the second phase controller are grounded.

[0101] The SW1 pin of the second phase controller is electrically connected to the first terminal of capacitor C6. The BOOST1 pin of the second phase controller is electrically connected to the second terminal of capacitor C6 and the cathode of Schottky diode D2. The anode of Schottky diode D2 is electrically connected to the anode of Schottky diode D20. The cathode of Schottky diode D20 is electrically connected to the BOOST2 pin of the second phase controller and the first terminal of capacitor C20. The second terminal of capacitor C20 is electrically connected to the SW2 pin of the second phase controller.

[0102] The INTVcc pin of the second phase controller is electrically connected to the first terminal of capacitor C12 and the positive terminal of polarized capacitor C17. The second terminal of capacitor C12 is electrically connected to the negative terminal of polarized capacitor C17 and grounded. The SENSE2+ pin of the second phase controller is electrically connected to the first terminal of capacitor C24 and connected to the fourth phase power output circuit unit. The SENSE2- pin of the second phase controller is electrically connected to the second terminal of capacitor C24 and connected to the fourth phase power output circuit unit.

[0103] The Vin pin of the second phase controller is electrically connected to the first terminal of capacitor C26 and IC-VCC, and the second terminal of capacitor C26 is electrically connected to the AMPMD pin of the second phase controller and grounded.

[0104] The EAIN pin of the second phase controller is electrically connected to the first terminal of capacitor C7. The second terminal of capacitor C7 is electrically connected to the first terminals of capacitors C9, C10, and C18 and grounded. The second terminal of capacitor C9 is electrically connected to the first terminal of resistor R1. The second terminal of resistor R1 is electrically connected to the PLLFLTR pin of the second phase controller and the second terminal of capacitor C10. The second terminal of capacitor C18 is electrically connected to the ITH pin of the second phase controller. The CLKOUTA pin of the second phase controller is electrically connected to the CLKOUTA pin of the first phase controller. The EAIN pin of the second phase controller is electrically connected to the EAIN pin of the first phase controller.

[0105] Thus, capacitors C9 and C10, along with resistor R1, are connected to the PLLFLTR pin of the second-phase controller to form the phase-locked loop low-pass filter circuit of the second-phase control circuit unit. Capacitor C18, connected to the ITH pin of the second-phase controller, forms the output and compensation point of the error amplifier. Capacitors C2 and C24 serve as three-phase and four-phase current filter capacitors, respectively. Capacitor C26 forms the power supply decoupling circuit of the second-phase controller. Schottky diodes D2 and D20, along with capacitors C6 and C20, form the bootstrap drive circuits for the high-side MOSFETs of the three-phase and four-phase controllers, respectively. Capacitors C12 and C17 serve as the internal 5V decoupling capacitors of the second-phase controller. Capacitor C4 serves as the filter capacitor for the external drive power supply. The CLKOUTA pin of the second-phase controller outputs a clock signal that is 90° out of phase with the control clock signal of one phase of the first-phase controller to the PLLIN pin of the second-phase controller to provide a synchronization clock signal for the second-phase control circuit.

[0106] Capacitor C7 serves as the filter capacitor for the EAIN pin of the second phase controller. Since the EAIN pin of the second phase controller is directly connected to the EAIN pin of the first phase controller, when the TRIM signal decreases, the voltage of the Vidffout pin of the second phase controller, which is output after passing through the differential amplifier inside the second phase controller, increases. The voltage of the EAIN pin of the second phase controller after voltage division increases relatively, causing the voltage of the EAIN pin of the second phase controller to rise slightly relative to the internal 0.8V reference voltage of the second phase controller. This, in turn, causes the voltage of the ITH pin of the second phase controller to decrease. The error amplifier of the second phase controller accelerates the low-level output time of TG1B and TG2B in each working cycle, thereby turning off the high-side MOSFET earlier and ultimately reducing the phase current.

[0107] Furthermore, the first phase power output circuit unit includes a sampling resistor P1, an inductor L1, a resistor R101, a resistor R201, a MOSFET Q1, a first Zener diode D101, a capacitor C501, a polarized capacitor C701, a polarized capacitor C36, a resistor R401, a MOSFET Q2, a second Zener diode D102, a MOSFET Q3, a third Zener diode D103, a capacitor C201, a resistor R301, and a first Schottky diode D100;

[0108] The first terminal of the sampling resistor P1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the sampling resistor P1 is electrically connected to the SENSE1- pin of the first phase controller. The first terminal of the inductor L1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the inductor L1 is electrically connected to the SW1 pin of the first phase controller, resistor R101, the source of MOSFET Q1, and the anode of the first Zener diode D101. The second terminal of resistor R101 is connected to resistor R... The first terminal of resistor R201 is electrically connected to the gate of MOSFET Q1. The drain of MOSFET Q1 is electrically connected to the first terminal of capacitor C501, the positive terminal of polarized capacitor C701, the cathode of first Zener diode D101, and the positive terminal of polarized capacitor C36. The second terminal of resistor R201 is electrically connected to the TG1 pin of the first phase controller. The second terminal of capacitor C501 is electrically connected to the negative terminals of polarized capacitors C7 and C36. The positive terminal of polarized capacitor C7 is connected to the external power supply VCC.

[0109] The first terminal of resistor R401 is electrically connected to the BG1 pin of the first phase controller, the gate of MOSFET Q2, and the gate of MOSFET Q3. The drain of MOSFET Q2 is electrically connected to the drain of MOSFET Q3, the SW1 pin of the first phase controller, the first terminal of capacitor C201, and the cathode of the first Schottky diode D100. The second terminal of resistor R401 is electrically connected to the source of MOSFET Q2, the source of MOSFET Q3, and the negative terminal of polarized capacitor C36. The anode of the second Zener diode D102 is electrically connected to the source of MOSFET Q2, and the cathode of the second Zener diode D102 is electrically connected to the drain of MOSFET Q2. The anode of the third Zener diode D103 is electrically connected to the source of MOSFET Q3, and the cathode of the third Zener diode D103 is electrically connected to the drain of MOSFET Q3.

[0110] The first end of the resistor R301 is electrically connected to the second end of the capacitor C201. The second end of the resistor R301 is electrically connected to the negative terminal of the polarized capacitor C36, the anode of the first Schottky diode D100, and the second end of the sampling resistor P1. The negative terminal of the polarized capacitor C36 is grounded.

[0111] Thus, the first phase power output circuit unit is a synchronous buck circuit, which is a 0° phase switching circuit. Resistors R201 and R101, and MOSFET Q1 constitute a high-side switching circuit. The TG1A signal output from the TG1 pin of the first phase controller controls the switching of MOSFET Q1. Resistors R4, MOSFET Q2, MOSFET Q3, the first Schottky diode D100, capacitor C201, and resistor R301 constitute a synchronous freewheeling circuit. L1 is a phase ripple current filtering inductor.

[0112] When the current exceeds the set value, the two ends of the sampling resistor P1 (resistance value 3mΩ) are connected to the control circuit of the first phase controller. The first phase controller outputs a high level (TG1A, SW1A) on the TG1 and SW1 pins to turn off the high-side switch circuit. At the same time, the first phase controller outputs a high level (BG1A, SW1A) on the BG1 and SW1 pins to control the synchronous freewheeling circuit to turn on.

[0113] Furthermore, the second phase power output circuit unit includes a sampling resistor P2, an inductor L2, resistors R701 and R801, a MOSFET Q4, a fourth Zener diode D104, a polarized capacitor C901, a capacitor C110, a resistor R501, a MOSFET Q5, a fifth Zener diode D105, a MOSFET Q6, a sixth Zener diode D106, a resistor R601, a capacitor C140, and a second Schottky diode D200;

[0114] The first terminal of the sampling resistor P2 is electrically connected to the SENSE2+ pin of the first phase controller, and the second terminal of the sampling resistor P2 is electrically connected to the SENSE2- pin of the first phase controller. The first terminal of the inductor L2 is electrically connected to the first terminal of the sampling resistor P2. The second terminal of the inductor L2 is electrically connected to SW2 of the first phase controller, the first terminal of resistor R801, and the source of MOSFET Q4. The second terminal of resistor R801 is electrically connected to the first terminal of resistor R701 and the gate of MOSFET Q4. The second terminal of resistor R701 is electrically connected to the TG2 pin of the first phase controller. The drain of MOSFET Q4 is electrically connected to the first terminal of capacitor C110, the positive terminal of polarized capacitor C901, and the external power supply VCC. The anode of the fourth Zener diode D104 is electrically connected to the source of MOSFET Q4, and the cathode of the fourth Zener diode D104 is electrically connected to the drain of MOSFET Q4.

[0115] The second terminal of capacitor C110 is electrically connected to the negative terminal of polarized capacitor C901, which is grounded. The first terminal of resistor R501 is electrically connected to the source of MOSFET Q5, the source of MOSFET Q6, the negative terminal of polarized capacitor C901, the first terminal of resistor R601, the anode of the second Schottky diode D200, and the second terminal of sampling resistor P2. The second terminal of resistor R501 is electrically connected to the gate of MOSFET Q5, the BG2 pin of the first phase controller, and the gate of MOSFET Q6. The drain of MOSFET Q5 is connected to the drain of MOSFET Q6. The drain, the SW2 pin of the first phase controller, the first terminal of capacitor C140, and the cathode of the second Schottky diode D200 are electrically connected. The second terminal of resistor R601 is electrically connected to the second terminal of capacitor C140. The anode of the fifth Zener diode D105 is electrically connected to the source of MOSFET Q5, and the cathode of the fifth Zener diode D105 is electrically connected to the drain of MOSFET Q5. The anode of the sixth Zener diode D106 is electrically connected to the source of MOSFET Q6, and the cathode of the sixth Zener diode D106 is electrically connected to the drain of MOSFET Q6.

[0116] Thus, the second phase power output circuit unit is a synchronous buck circuit, which is a 180° phase switching circuit. Resistors R701 and R801, and MOSFET Q4 constitute a high-side switching circuit. The TG2A signal output from the TG2 pin of the first phase controller controls the switching of MOSFET Q4. Resistors R501, MOSFET Q5, MOSFET Q6, the second Schottky diode D200, capacitor C140, and resistor R601 constitute a synchronous freewheeling circuit. When the current exceeds the set value, the two ends of the sampling resistor (3mΩ) are connected to the control circuit of the first phase controller. The second phase controller outputs a level (TG2A, SW2A) on the TG2 and SW2 pins to turn off the high-side switching circuit. At the same time, the first phase controller outputs a high level (BG2A, SW2A) on the BG2 and SW2 pins to control the synchronous freewheeling circuit to turn on.

[0117] Furthermore, the third-phase power output circuit unit includes a sampling resistor P3, an inductor L3, a resistor R901, a resistor R100, a MOSFET Q7, a seventh Zener diode D107, a capacitor C190, a polarized capacitor C210, a polarized capacitor C37, a resistor R120, a MOSFET Q8, an eighth Zener diode D108, a MOSFET Q9, a ninth Zener diode D109, a capacitor C160, a resistor R110, and a third Schottky diode D300;

[0118] The first terminal of the sampling resistor P3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the sampling resistor P3 is electrically connected to the SENSE1- pin of the second phase controller. The first terminal of the inductor L3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the inductor L3 is electrically connected to the SW1 pin of the second phase controller, the first terminal of resistor R901, the source of MOSFET Q7, and the anode of the seventh Zener diode D107. The second terminal of resistor R901 is connected to resistor R... The first terminal of resistor R100 is electrically connected to the gate of MOSFET Q7. The drain of MOSFET Q7 is electrically connected to the first terminal of capacitor C190, the positive terminal of polarized capacitor C210, the cathode of the seventh Zener diode D107, and the positive terminal of polarized capacitor C37. The second terminal of resistor R100 is electrically connected to the TG1 pin of the second phase controller. The second terminal of capacitor C190 is electrically connected to the negative terminals of polarized capacitors C210 and C37. The positive terminal of polarized capacitor C210 is connected to the external power supply VCC.

[0119] The first terminal of resistor R120 is electrically connected to the BG1 pin of the second phase controller, the gate of MOSFET Q8, and the gate of MOSFET Q9. The drain of MOSFET Q8 is electrically connected to the drain of MOSFET Q9, the SW1 pin of the second phase controller, the first terminal of capacitor C160, and the cathode of the third Schottky diode D300. The second terminal of resistor R120 is electrically connected to the source of MOSFET Q8, the source of MOSFET Q9, and the negative terminal of polarized capacitor C37. The anode of the eighth Zener diode D108 is electrically connected to the source of MOSFET Q8, and the cathode of the eighth Zener diode D108 is electrically connected to the drain of MOSFET Q8. The anode of the ninth Zener diode D109 is electrically connected to the source of MOSFET Q9, and the cathode of the ninth Zener diode D109 is electrically connected to the drain of MOSFET Q9.

[0120] The first end of the resistor R110 is electrically connected to the second end of the capacitor C160, the second end of the resistor R110 is electrically connected to the negative terminal of the polarized capacitor C37, the anode of the third Schottky diode D300 is electrically connected to the second end of the resistor R110 and the second end of the sampling resistor P3, and the negative terminal of the polarized capacitor C37 is grounded.

[0121] Thus, the third-phase power output circuit unit is a synchronous buck circuit, which is a 90° phase switching circuit. Resistors R901 and R100, and MOSFET Q7 constitute a high-side switching circuit. The TG1B signal output from the TG1 pin of the second-phase controller controls the switching of MOSFET Q7. Resistors R120, MOSFET Q8, MOSFET Q9, the third Schottky diode D300, capacitor C160, and resistor R101 constitute a synchronous freewheeling circuit.

[0122] When the current exceeds the set value, the two ends of the sampling resistor P3 (resistance value 3mΩ) are connected to the control circuit of the second phase controller. The second phase controller outputs a high level (TG1B, SW1B) on the TG1 and SW1 pins to turn off the high-side switch circuit. At the same time, the first phase controller outputs a high level (BG1B, SW1B) on the BG1 and SW1 pins to control the synchronous freewheeling circuit to turn on.

[0123] Furthermore, the fourth phase power output circuit unit includes a sampling resistor P4, an inductor L4, resistors R160 and R150, a MOSFET Q10, a tenth Zener diode D210, a polarized capacitor C230, a capacitor C250, a resistor R130, a MOSFET Q11, an eleventh Zener diode D211, a MOSFET Q12, a twelfth Zener diode D212, a resistor R140, a capacitor C280, and a fourth Schottky diode D400.

[0124] The first terminal of the sampling resistor P4 is electrically connected to the SENSE2+ pin of the second phase controller, and the second terminal of the sampling resistor P4 is electrically connected to the SENSE2- pin of the second phase controller. The first terminal of the inductor L4 is electrically connected to the first terminal of the sampling resistor P4. The second terminal of the inductor L4 is electrically connected to SW2 of the second phase controller, the first terminal of resistor R160, and the source of MOSFET Q10. The second terminal of resistor R160 is electrically connected to the first terminal of resistor R150 and the gate of MOSFET Q10. The second terminal of resistor R150 is electrically connected to the TG2 pin of the second phase controller. The drain of MOSFET Q10 is electrically connected to the first terminal of capacitor C250, the positive terminal of polarized capacitor C230, and the external power supply VCC. The anode of the tenth Zener diode D210 is electrically connected to the source of MOSFET Q10, and the cathode of the tenth Zener diode D210 is electrically connected to the drain of MOSFET Q10.

[0125] The second terminal of capacitor C250 is electrically connected to the negative terminal of polarized capacitor C230, which is grounded. The first terminal of resistor R130 is electrically connected to the source of MOSFET Q11, the source of MOSFET Q12, the negative terminal of polarized capacitor C230, the first terminal of resistor R140, the anode of fourth Schottky diode D400, and the second terminal of sampling resistor P4. The second terminal of resistor R130 is electrically connected to the gate of MOSFET Q11, the BG2 pin of the second phase controller, and the gate of MOSFET Q12. The drain of MOSFET Q11 is electrically connected to the drain of MOSFET Q12, the SW2 pin of the second phase controller, the first terminal of capacitor C280, and the cathode of fourth Schottky diode D400. The second terminal of resistor R140 is electrically connected to the second terminal of capacitor C280.

[0126] The anode of the eleventh Zener diode D211 is electrically connected to the source of the MOSFET Q11, and the cathode of the eleventh Zener diode D211 is electrically connected to the drain of the MOSFET Q11. The anode of the twelfth Zener diode D212 is electrically connected to the source of the MOSFET Q12, and the cathode of the twelfth Zener diode D212 is electrically connected to the drain of the MOSFET Q12.

[0127] Thus, the fourth-phase power output circuit unit is a synchronous buck circuit, which is a 270° phase switching circuit. Resistors R150 and R160, and MOSFET Q10 constitute a high-side switching circuit. The TG2B signal output from the TG2 pin of the second-phase controller controls the switching of MOSFET Q10. Resistors R130, MOSFET Q11, MOSFET Q12, the fourth Schottky diode D400, capacitor C280, and resistor R140 constitute a synchronous freewheeling circuit.

[0128] When the current exceeds the set value, the two ends of the sampling resistor (3mΩ) are connected to the control circuit of the second phase controller. The second phase controller outputs a high level (TG2A, SW2A) on the TG2 and SW2 pins to turn off the high-side switch circuit. At the same time, the second phase controller outputs a high level (BG2B, SW2B) on the BG2 and SW2 pins to control the synchronous freewheeling circuit to turn on.

[0129] Furthermore, the output capacitor unit includes capacitor C1, polarized capacitor C4, capacitor C3, polarized capacitor C6, capacitor C12, polarized capacitor C8, capacitor C13, polarized capacitor C10, capacitor C15, polarized capacitor C18, capacitor C17, polarized capacitor C20, capacitor C26, polarized capacitor C22, capacitor C27, and polarized capacitor C24;

[0130] The first terminal of capacitor C1 is electrically connected to the positive terminal of polarized capacitor C4, the first terminal of capacitor C3, the positive terminal of polarized capacitor C6, the first terminal of capacitor C12, the positive terminal of polarized capacitor C8, the first terminal of capacitor C13, the positive terminal of polarized capacitor C10, the first terminal of capacitor C15, the positive terminal of polarized capacitor C18, the first terminal of capacitor C17, the positive terminal of polarized capacitor C20, the first terminal of capacitor C26, the positive terminal of polarized capacitor C22, the first terminal of capacitor C27, and the positive terminal of polarized capacitor C24.

[0131] The second terminal of capacitor C1 is electrically connected to the negative terminal of polarized capacitor C4, the second terminal of capacitor C3, the negative terminal of polarized capacitor C6, the second terminal of capacitor C12, the negative terminal of polarized capacitor C8, the second terminal of capacitor C13, and the negative terminal of polarized capacitor C10. The second terminal of capacitor C15, the negative terminal of polarized capacitor C18, the second terminal of capacitor C17, the negative terminal of polarized capacitor C20, the second terminal of capacitor C26, the negative terminal of polarized capacitor C22, the second terminal of capacitor C27, and the negative terminal of polarized capacitor C24 are electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C1 is also electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C13 is also electrically connected to the second terminal of the sampling resistor P2. The first terminal of capacitor C15 is also electrically connected to the second terminal of the sampling resistor P3. The first terminal of capacitor C27 is also electrically connected to the second terminal of the sampling resistor P4.

[0132] The capacitors C1 and C3 are high-frequency ceramic capacitors, mainly used for high-frequency filtering; the polarized capacitors C4 and C6 are low-ESR electrolytic capacitors, mainly used for medium and low-frequency filtering. The capacitors C1, C3, C4, and C6 together form a filter capacitor circuit for the output of the first phase power output circuit unit.

[0133] The capacitors C12 and C13 are high-frequency ceramic capacitors, mainly used for high-frequency filtering; the polarized capacitors C8 and C10 are low-ESR electrolytic capacitors, mainly used for medium and low-frequency filtering. The capacitors C12, C13, C8, and C10 together form a wave filtering capacitor circuit for the output of the second phase power output circuit unit.

[0134] The capacitors C15 and C17 are high-frequency ceramic capacitors, mainly used for high-frequency filtering; the polarized capacitors C18 and C20 are low-ESR electrolytic capacitors, mainly used for medium and low-frequency filtering. The capacitors C15, C17, C18, and C20 together form a filter capacitor circuit for the output of the third-phase power output circuit unit.

[0135] Capacitors C26 and C27 are high-frequency ceramic capacitors, mainly used for high-frequency filtering; polarized capacitors C22 and C24 are low-ESR electrolytic capacitors, mainly used for medium and low-frequency filtering. Capacitors C26, C27, C22, and C24 together form a filter capacitor circuit for the output of the fourth-phase power output circuit unit; through reasonable wiring, the current of the four-channel filter capacitor circuit is combined, and the current of the four-channel filter capacitor circuit is finally superimposed to form a stable low-voltage high-current output.

[0136] Furthermore, the output load includes a plurality of laser diodes, the anodes of the plurality of laser diodes being electrically connected to the positive terminal of the polarized capacitor C10, the cathodes of the plurality of laser diodes being electrically connected to the first terminal of the output current sampling resistor R800, and the second terminal of the output current sampling resistor R800 being electrically connected to the current feedback transmitter circuit unit.

[0137] It should be noted that in this embodiment, the output current sampling resistor R800 is a low-temperature drift resistor with a resistance of 1-5mΩ, a power of 5-20W, and an output voltage Vo=I*1mV. When the operating current is 60A, Vo is 60mV.

[0138] Furthermore, the current feedback transmitter circuit unit includes a resistor R5.0, a capacitor C4.0, a thirteenth Zener diode D130, a capacitor C9.0, a resistor R2.0, a resistor R1.0, a microcontroller U100, a capacitor C3.0, a resistor R1.2, a capacitor C1.1, a fourteenth Zener diode D140, a variable resistor R1.1, a capacitor C1.2, a capacitor C1.3, and a diode D6;

[0139] The first terminal of resistor R5.0 is electrically connected to the first terminal of the output current sampling resistor R800. The second terminal of resistor R5.0 is electrically connected to the first terminal of capacitor C4.0, the cathode of the thirteenth Zener diode D130, the first terminal of capacitor C9.0, and the IN- pin of microcontroller U100. The second terminal of capacitor C4.0 is electrically connected to the anode of the thirteenth Zener diode D130 and grounded. The first terminal of resistor R1.0 is electrically connected to the second terminal of the output current sampling resistor R800. The second terminal of resistor R1.0 is electrically connected to the first terminal of capacitor C1.1, the cathode of the fourteenth Zener diode D140, the second terminal of capacitor C9.0, and the IN+ pin of microcontroller U100. The second terminal of capacitor C1.1 is electrically connected to the anode of the fourteenth Zener diode D140 and grounded.

[0140] The first terminal of resistor R2.0 is electrically connected to the first terminal of variable resistor R1.1. The second terminal of resistor R2.0 is electrically connected to one J pin of microcontroller U100. The second terminal of variable resistor R1.1 is electrically connected to the other J pin of microcontroller U100. The +V pin of microcontroller U100 is electrically connected to the first terminal of capacitor C3.0 and the 5V power supply of the differential amplifier circuit. The OUT pin of microcontroller U100 is electrically connected to the first terminal of resistor R7. The REF pin of microcontroller U100 is electrically connected to the first terminals of resistor R1.2, capacitor C1.2, capacitor C1.3, and the anode of diode D6.

[0141] The second terminal of the resistor R1.2 is electrically connected to the second terminal of the capacitor C1.2 and grounded. The cathode of the diode D6 is electrically connected to the second terminal of the capacitor C1.3 and the 5V power supply of the differential amplifier circuit.

[0142] Thus, the output current sampling resistor R800 outputs Vo, which is then filtered through a low-pass filter at the inverting input terminal consisting of resistor R5.0 and capacitor C4.0, a low-pass filter at the non-inverting input terminal consisting of resistor R1.1 and capacitor C1.1, and a low-pass filter for differential interference signals consisting of resistor R5.0, capacitor C9.0, and resistor R1.0. By appropriately adjusting the resistance value of resistor R1.0, the output voltage Vo can be accurately amplified by 10-20 times, such as IOUT=10Vo.

[0143] The present invention is not limited to the description in the specification and embodiments, and thus other advantages and modifications can be readily realized by those skilled in the art. Therefore, the present invention is not limited to the specific details, representative devices and examples shown and described herein without departing from the spirit and scope of the general concept as defined by the claims and their equivalents.

Claims

1. A multiphase step-down constant current source circuit, characterized in that, include: Differential amplifier circuit unit; The first phase control circuit unit is electrically connected to the differential amplifier circuit unit; The second phase control circuit unit is electrically connected to the differential amplifier circuit unit; The system includes: a first-phase power output circuit unit; a second-phase power output circuit unit, both of which are electrically connected to the first-phase control circuit unit; a third-phase power output circuit unit; and a fourth-phase power output circuit unit, both of which are electrically connected to the second-phase control circuit unit. An output capacitor unit is electrically connected to the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, and the fourth phase power output circuit unit. An output load, which is electrically connected to the output capacitor unit; Output current sampling resistor R800, which is electrically connected to the output load; current feedback transmitter circuit unit, which is electrically connected between the differential amplifier circuit unit and the output current sampling resistor R800; The differential amplifier circuit unit includes resistor R7, capacitor C7, resistor R4, capacitor C2, capacitor C6, resistor R15, resistor R16, analog switch S1, resistor R12, capacitor C14, Zener diode D7, operational amplifier U3, resistor R9, Zener diode D3, and capacitor C10. The first end of resistor R7 is electrically connected to the current feedback transmitter circuit unit and the first end of capacitor C7. The second end of resistor R7 is electrically connected to the second end of capacitor C7, the first end of resistor R4, and the inverting input of operational amplifier U3. The second end of resistor R4 is electrically connected to the first end of capacitor C2. The second end of capacitor C2 is electrically connected to the first end of resistor R9, the cathode of Zener diode D3, and the first end of capacitor C10. The second end of resistor R9 is electrically connected to the output of operational amplifier U3. The second end of capacitor C10 is electrically connected to the anode of Zener diode D3 and grounded. One power input terminal of operational amplifier U3 is electrically connected to capacitor C6 and an external 5V power supply. Capacitor C6 is grounded. The other power input terminal of operational amplifier U3 is grounded. The first terminal of resistor R16 is used to connect a given PWM analog modulation voltage signal. The second terminal of resistor R16 is electrically connected to the first terminal of resistor R15 and the SNO pin of analog switch S1. The second terminal of resistor R15 is electrically connected to the COM pin of analog switch S1. Analog switch S1 connects to the given analog voltage signal. Analog switch S1 is electrically connected to the first terminal of resistor R12. The second terminal of resistor R12 is electrically connected to the non-inverting input terminal of operational amplifier U3, the first terminal of capacitor C14, and the cathode of Zener diode D7. The GND pin of analog switch S1 is electrically connected to the second terminal of capacitor C14 and the anode of Zener diode D7. Resistor R9 is electrically connected to the first phase control circuit unit and the second phase control circuit unit. A PWM analog modulated voltage signal is given at the positive input terminal of the differential amplifier circuit unit. It passes through the first phase control circuit unit, the second phase control circuit unit, the first phase power output circuit unit, the second phase power output circuit unit, the third phase power output circuit unit, the fourth phase power output circuit unit, the output load, the output current sampling resistor R800, and finally the voltage signal corresponding to the output load current after being amplified by the current feedback transmitter circuit unit is input to the inverting input terminal of the differential amplifier circuit unit. The two voltage signals at the input of the differential amplifier circuit unit are compared to generate a deviation signal, which controls the first phase control circuit unit to output two currents of different phases through the first phase power output circuit unit and the second phase power output circuit unit. At the same time, it also controls the second phase control circuit unit to output two currents of different phases through the third phase power output circuit unit and the fourth phase power output circuit unit. The current is output to the output load.

2. The multiphase step-down constant current source circuit as described in claim 1, characterized in that, The first phase control circuit unit includes a first phase controller, capacitor C30, diode D4, diode D5, polarized capacitor C29, voltage regulator chip U30, resistor R5, capacitor C21, resistor R6, resistor R3, capacitor C15, capacitor C13, capacitor C8, resistor R2, resistor R4, capacitor C14, capacitor C333, capacitor C111, Schottky diode D1, and Schottky diode D11. The first terminal of capacitor C30 is connected to a 12V external power supply. The second terminal of capacitor C30 is electrically connected to the cathode of diode D5 and the negative terminal of polarized capacitor C29. The anode of diode D5 is electrically connected to the cathode of diode D4. The anode of diode D4 is electrically connected to the GND pin of voltage regulator chip U30. The INOUT pin of voltage regulator chip U30 is electrically connected to the first terminal of capacitor C30. Voltage regulator chip U30 is electrically connected to the polarized capacitor C29 and the first terminal of resistor R6. The second terminal of resistor R6 is electrically connected to the first terminal of resistor R5, the first terminal of capacitor C21, and the PLLFLTR pin of the first phase controller. The second terminal of resistor R5 is electrically connected to the second terminal of capacitor C21, the first terminal of resistor R3, the first terminal of capacitor C15, and the first terminal of capacitor C8. The second terminal of resistor R3 is electrically connected to the first terminals of capacitors C13 and C15. The second terminal of capacitor C13 is electrically connected to the TTH pin of the first phase controller. The second terminal of capacitor C8 is electrically connected to the RUN / SS pin of the first phase controller. The first end of resistor R2 is electrically connected to the Vdiffout pin of the first phase controller and the first end of capacitor C14. The second end of resistor R2 is electrically connected to the second end of capacitor C14, the first end of resistor R4, and the EAIN pin of the first phase controller. The second end of resistor R4 is grounded. The Vos- pin of the first phase controller is electrically connected to resistor R9 of the differential amplifier circuit unit. The EXTVcc pin of the first phase controller is electrically connected to a 6.5V external power supply and also electrically connected to capacitor C333, which is grounded. The SENSE1- pin of the first phase controller is electrically connected to the first terminal of capacitor C111 and connected to the first phase power output circuit unit. The SENSE1+ pin of the first phase controller is electrically connected to the second terminal of capacitor C111 and connected to the first phase power output circuit unit. The Vos+ pin of the first phase controller is electrically connected to the first terminal of capacitor C22, and the Vos- pin of the first phase controller is electrically connected to the second terminal of capacitor C22. The SW1 pin of the first phase controller is electrically connected to the first terminal of capacitor C5. The BOOST1 pin of the first phase controller is electrically connected to the second terminal of capacitor C5 and the cathode of Schottky diode D1. The anode of Schottky diode D1 is electrically connected to the anode of Schottky diode D11. The cathode of Schottky diode D11 is electrically connected to the BOOST2 pin of the first phase controller and the first terminal of capacitor C19. The second terminal of capacitor C19 is electrically connected to the SW2 pin of the first phase controller. The INTVcc pin of the first phase controller is electrically connected to the first terminal of capacitor C11 and the positive terminal of polarized capacitor C16. The second terminal of capacitor C11 is electrically connected to the negative terminal of polarized capacitor C16. The SENSE2+ pin of the first phase controller is electrically connected to the first terminal of capacitor C23 and connected to the second phase power output circuit unit. The SENSE2- pin of the first phase controller is electrically connected to the second terminal of capacitor C23 and connected to the second phase power output circuit unit. The Vin pin of the first phase controller is electrically connected to the first end of capacitor C25, the positive terminal of polarized capacitor C27, and the first end of resistor R8. The AMPMD pin of the first phase controller is electrically connected to the second end of capacitor C25 and grounded. The negative terminal of polarized capacitor C27 is grounded. The second end of resistor R8 is connected to a 12V external power supply.

3. The multiphase step-down constant current source circuit as described in claim 2, characterized in that, The second phase control circuit unit includes a second phase controller, capacitor C4, capacitor C20, Schottky diode D2, Schottky diode D20, and capacitor C6; The EXTVcc pin of the second phase controller is electrically connected to capacitor C4 and to the 6.5V external power supply on the first phase controller. Capacitor C4 is grounded. The SENSE1- pin of the second phase controller is electrically connected to the first terminal of capacitor C2 and connected to the third phase power output circuit unit. The SENSE1+ pin of the second phase controller is electrically connected to the second terminal of capacitor C2 and connected to the third phase power output circuit unit. The Vos+ pin and the Vos- pin of the second phase controller are grounded. The SW1 pin of the second phase controller is electrically connected to the first terminal of capacitor C6. The BOOST1 pin of the second phase controller is electrically connected to the second terminal of capacitor C6 and the cathode of Schottky diode D2. The anode of Schottky diode D2 is electrically connected to the anode of Schottky diode D20. The cathode of Schottky diode D20 is electrically connected to the BOOST2 pin of the second phase controller and the first terminal of capacitor C20. The second terminal of capacitor C20 is electrically connected to the SW2 pin of the second phase controller. The INTVcc pin of the second phase controller is electrically connected to the first terminal of capacitor C12 and the positive terminal of polarized capacitor C17. The second terminal of capacitor C12 is electrically connected to the negative terminal of polarized capacitor C17 and grounded. The SENSE2+ pin of the second phase controller is electrically connected to the first terminal of capacitor C24 and connected to the fourth phase power output circuit unit. The SENSE2- pin of the second phase controller is electrically connected to the second terminal of capacitor C24 and connected to the fourth phase power output circuit unit. The Vin pin of the second phase controller is electrically connected to the first terminal of capacitor C26 and IC-VCC, and the second terminal of capacitor C26 is electrically connected to the AMPMD pin of the second phase controller and grounded. The EAIN pin of the second phase controller is electrically connected to the first terminal of capacitor C7. The second terminal of capacitor C7 is electrically connected to the first terminals of capacitors C9, C10, and C18 and grounded. The second terminal of capacitor C9 is electrically connected to the first terminal of resistor R1. The second terminal of resistor R1 is electrically connected to the PLLFLTR pin of the second phase controller and the second terminal of capacitor C10. The second terminal of capacitor C18 is electrically connected to the ITH pin of the second phase controller. The CLKOUTA pin of the second phase controller is electrically connected to the CLKOUTA pin of the first phase controller. The EAIN pin of the second phase controller is electrically connected to the EAIN pin of the first phase controller.

4. The multiphase step-down constant current source circuit as described in claim 3, characterized in that, The first phase power output circuit unit includes a sampling resistor P1, an inductor L1, a resistor R101, a resistor R201, a MOSFET Q1, a first Zener diode D101, a capacitor C501, a polarized capacitor C701, a polarized capacitor C36, a resistor R401, a MOSFET Q2, a second Zener diode D102, a MOSFET Q3, a third Zener diode D103, a capacitor C201, a resistor R301, and a first Schottky diode D100; The first terminal of the sampling resistor P1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the sampling resistor P1 is electrically connected to the SENSE1- pin of the first phase controller. The first terminal of the inductor L1 is electrically connected to the SENSE1+ pin of the first phase controller, and the second terminal of the inductor L1 is electrically connected to the SW1 pin of the first phase controller, resistor R101, the source of MOSFET Q1, and the anode of the first Zener diode D101. The second terminal of resistor R101 is connected to resistor R... The first terminal of resistor R201 is electrically connected to the gate of MOSFET Q1. The drain of MOSFET Q1 is electrically connected to the first terminal of capacitor C501, the positive terminal of polarized capacitor C701, the cathode of first Zener diode D101, and the positive terminal of polarized capacitor C36. The second terminal of resistor R201 is electrically connected to the TG1 pin of the first phase controller. The second terminal of capacitor C501 is electrically connected to the negative terminals of polarized capacitors C7 and C36. The positive terminal of polarized capacitor C7 is connected to the external power supply VCC. The first terminal of resistor R401 is electrically connected to the BG1 pin of the first phase controller, the gate of MOSFET Q2, and the gate of MOSFET Q3. The drain of MOSFET Q2 is electrically connected to the drain of MOSFET Q3, the SW1 pin of the first phase controller, the first terminal of capacitor C201, and the cathode of the first Schottky diode D100. The second terminal of resistor R401 is electrically connected to the source of MOSFET Q2, the source of MOSFET Q3, and the negative terminal of polarized capacitor C36. The anode of the second Zener diode D102 is electrically connected to the source of MOSFET Q2, and the cathode of the second Zener diode D102 is electrically connected to the drain of MOSFET Q2. The anode of the third Zener diode D103 is electrically connected to the source of MOSFET Q3, and the cathode of the third Zener diode D103 is electrically connected to the drain of MOSFET Q3. The first end of the resistor R301 is electrically connected to the second end of the capacitor C201. The second end of the resistor R301 is electrically connected to the negative terminal of the polarized capacitor C36, the anode of the first Schottky diode D100, and the second end of the sampling resistor P1. The negative terminal of the polarized capacitor C36 is grounded.

5. The multiphase step-down constant current source circuit as described in claim 4, characterized in that, The second phase power output circuit unit includes a sampling resistor P2, an inductor L2, a resistor R701, a resistor R801, a MOSFET Q4, a fourth Zener diode D104, a polarized capacitor C901, a capacitor C110, a resistor R501, a MOSFET Q5, a fifth Zener diode D105, a MOSFET Q6, a sixth Zener diode D106, a resistor R601, a capacitor C140, and a second Schottky diode D200; The first terminal of the sampling resistor P2 is electrically connected to the SENSE2+ pin of the first phase controller, and the second terminal of the sampling resistor P2 is electrically connected to the SENSE2- pin of the first phase controller. The first terminal of the inductor L2 is electrically connected to the first terminal of the sampling resistor P2. The second terminal of the inductor L2 is electrically connected to SW2 of the first phase controller, the first terminal of resistor R801, and the source of MOSFET Q4. The second terminal of resistor R801 is electrically connected to the first terminal of resistor R701 and the gate of MOSFET Q4. The second terminal of resistor R701 is electrically connected to the TG2 pin of the first phase controller. The drain of MOSFET Q4 is electrically connected to the first terminal of capacitor C110, the positive terminal of polarized capacitor C901, and the external power supply VCC. The anode of the fourth Zener diode D104 is electrically connected to the source of MOSFET Q4, and the cathode of the fourth Zener diode D104 is electrically connected to the drain of MOSFET Q4. The second terminal of capacitor C110 is electrically connected to the negative terminal of polarized capacitor C901, which is grounded. The first terminal of resistor R501 is electrically connected to the source of MOSFET Q5, the source of MOSFET Q6, the negative terminal of polarized capacitor C901, the first terminal of resistor R601, the anode of the second Schottky diode D200, and the second terminal of sampling resistor P2. The second terminal of resistor R501 is electrically connected to the gate of MOSFET Q5, the BG2 pin of the first phase controller, and the gate of MOSFET Q6. The drain of MOSFET Q5 is connected to the drain of MOSFET Q6. The drain, the SW2 pin of the first phase controller, the first terminal of capacitor C140, and the cathode of the second Schottky diode D200 are electrically connected. The second terminal of resistor R601 is electrically connected to the second terminal of capacitor C140. The anode of the fifth Zener diode D105 is electrically connected to the source of MOSFET Q5, and the cathode of the fifth Zener diode D105 is electrically connected to the drain of MOSFET Q5. The anode of the sixth Zener diode D106 is electrically connected to the source of MOSFET Q6, and the cathode of the sixth Zener diode D106 is electrically connected to the drain of MOSFET Q6.

6. The multiphase step-down constant current source circuit as described in claim 5, characterized in that, The third-phase power output circuit unit includes a sampling resistor P3, an inductor L3, a resistor R901, a resistor R100, a MOSFET Q7, a seventh Zener diode D107, a capacitor C190, a polarized capacitor C210, a polarized capacitor C37, a resistor R120, a MOSFET Q8, an eighth Zener diode D108, a MOSFET Q9, a ninth Zener diode D109, a capacitor C160, a resistor R110, and a third Schottky diode D300. The first terminal of the sampling resistor P3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the sampling resistor P3 is electrically connected to the SENSE1- pin of the second phase controller. The first terminal of the inductor L3 is electrically connected to the SENSE1+ pin of the second phase controller, and the second terminal of the inductor L3 is electrically connected to the SW1 pin of the second phase controller, the first terminal of resistor R901, the source of MOSFET Q7, and the anode of the seventh Zener diode D107. The second terminal of resistor R901 is connected to resistor R... The first terminal of resistor R100 is electrically connected to the gate of MOSFET Q7. The drain of MOSFET Q7 is electrically connected to the first terminal of capacitor C190, the positive terminal of polarized capacitor C210, the cathode of the seventh Zener diode D107, and the positive terminal of polarized capacitor C37. The second terminal of resistor R100 is electrically connected to the TG1 pin of the second phase controller. The second terminal of capacitor C190 is electrically connected to the negative terminals of polarized capacitors C210 and C37. The positive terminal of polarized capacitor C210 is connected to the external power supply VCC. The first terminal of resistor R120 is electrically connected to the BG1 pin of the second phase controller, the gate of MOSFET Q8, and the gate of MOSFET Q9. The drain of MOSFET Q8 is electrically connected to the drain of MOSFET Q9, the SW1 pin of the second phase controller, the first terminal of capacitor C160, and the cathode of the third Schottky diode D300. The second terminal of resistor R120 is electrically connected to the source of MOSFET Q8, the source of MOSFET Q9, and the negative terminal of polarized capacitor C37. The anode of the eighth Zener diode D108 is electrically connected to the source of MOSFET Q8, and the cathode of the eighth Zener diode D108 is electrically connected to the drain of MOSFET Q8. The anode of the ninth Zener diode D109 is electrically connected to the source of MOSFET Q9, and the cathode of the ninth Zener diode D109 is electrically connected to the drain of MOSFET Q9. The first end of the resistor R110 is electrically connected to the second end of the capacitor C160, the second end of the resistor R110 is electrically connected to the negative terminal of the polarized capacitor C37, the anode of the third Schottky diode D300 is electrically connected to the second end of the resistor R110 and the second end of the sampling resistor P3, and the negative terminal of the polarized capacitor C37 is grounded.

7. The multiphase step-down constant current source circuit as described in claim 6, characterized in that, The fourth phase power output circuit unit includes a sampling resistor P4, an inductor L4, resistors R160 and R150, a MOSFET Q10, a tenth Zener diode D210, a polarized capacitor C230, a capacitor C250, a resistor R130, a MOSFET Q11, an eleventh Zener diode D211, a MOSFET Q12, a twelfth Zener diode D212, a resistor R140, a capacitor C280, and a fourth Schottky diode D400. The first terminal of the sampling resistor P4 is electrically connected to the SENSE2+ pin of the second phase controller, and the second terminal of the sampling resistor P4 is electrically connected to the SENSE2- pin of the second phase controller. The first terminal of the inductor L4 is electrically connected to the first terminal of the sampling resistor P4. The second terminal of the inductor L4 is electrically connected to SW2 of the second phase controller, the first terminal of resistor R160, and the source of MOSFET Q10. The second terminal of resistor R160 is electrically connected to the first terminal of resistor R150 and the gate of MOSFET Q10. The second terminal of resistor R150 is electrically connected to the TG2 pin of the second phase controller. The drain of MOSFET Q10 is electrically connected to the first terminal of capacitor C250, the positive terminal of polarized capacitor C230, and the external power supply VCC. The anode of the tenth Zener diode D210 is electrically connected to the source of MOSFET Q10, and the cathode of the tenth Zener diode D210 is electrically connected to the drain of MOSFET Q10. The second terminal of capacitor C250 is electrically connected to the negative terminal of polarized capacitor C230, which is grounded. The first terminal of resistor R130 is electrically connected to the source of MOSFET Q11, the source of MOSFET Q12, the negative terminal of polarized capacitor C230, the first terminal of resistor R140, the anode of fourth Schottky diode D400, and the second terminal of sampling resistor P4. The second terminal of resistor R130 is electrically connected to the gate of MOSFET Q11, the BG2 pin of the second phase controller, and the gate of MOSFET Q12. The drain of MOSFET Q11 is electrically connected to the drain of MOSFET Q12, the SW2 pin of the second phase controller, the first terminal of capacitor C280, and the cathode of fourth Schottky diode D400. The second terminal of resistor R140 is electrically connected to the second terminal of capacitor C280. The anode of the eleventh Zener diode D211 is electrically connected to the source of the MOSFET Q11, and the cathode of the eleventh Zener diode D211 is electrically connected to the drain of the MOSFET Q11. The anode of the twelfth Zener diode D212 is electrically connected to the source of the MOSFET Q12, and the cathode of the twelfth Zener diode D212 is electrically connected to the drain of the MOSFET Q12.

8. The multiphase step-down constant current source circuit as described in claim 7, characterized in that, The output capacitor unit includes capacitor C1, polarized capacitor C4, capacitor C3, polarized capacitor C6, capacitor C12, polarized capacitor C8, capacitor C13, polarized capacitor C10, capacitor C15, polarized capacitor C18, capacitor C17, polarized capacitor C20, capacitor C26, polarized capacitor C22, capacitor C27, and polarized capacitor C24. The first terminal of capacitor C1 is electrically connected to the positive terminal of polarized capacitor C4, the first terminal of capacitor C3, the positive terminal of polarized capacitor C6, the first terminal of capacitor C12, the positive terminal of polarized capacitor C8, the first terminal of capacitor C13, the positive terminal of polarized capacitor C10, the first terminal of capacitor C15, the positive terminal of polarized capacitor C18, the first terminal of capacitor C17, the positive terminal of polarized capacitor C20, the first terminal of capacitor C26, the positive terminal of polarized capacitor C22, the first terminal of capacitor C27, and the positive terminal of polarized capacitor C24. The second terminal of capacitor C1 is electrically connected to the negative terminal of polarized capacitor C4, the second terminal of capacitor C3, the negative terminal of polarized capacitor C6, the second terminal of capacitor C12, the negative terminal of polarized capacitor C8, the second terminal of capacitor C13, and the negative terminal of polarized capacitor C10. The second terminal of capacitor C15, the negative terminal of polarized capacitor C18, the second terminal of capacitor C17, the negative terminal of polarized capacitor C20, the second terminal of capacitor C26, the negative terminal of polarized capacitor C22, the second terminal of capacitor C27, and the negative terminal of polarized capacitor C24 are electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C1 is also electrically connected to the second terminal of the sampling resistor P1. The first terminal of capacitor C13 is also electrically connected to the second terminal of the sampling resistor P2. The first terminal of capacitor C15 is also electrically connected to the second terminal of the sampling resistor P3. The first terminal of capacitor C27 is also electrically connected to the second terminal of the sampling resistor P4.

9. The multiphase step-down constant current source circuit as described in claim 8, characterized in that, The output load includes a plurality of laser diodes, the anodes of the plurality of laser diodes being electrically connected to the positive terminal of the polarized capacitor C10, the cathodes of the plurality of laser diodes being electrically connected to the first terminal of the output current sampling resistor R800, and the second terminal of the output current sampling resistor R800 being electrically connected to the current feedback transmitter circuit unit. The current feedback transmitter circuit unit includes a resistor R5.0, a capacitor C4.0, a thirteenth Zener diode D130, a capacitor C9.0, a resistor R2.0, a resistor R1.0, a microcontroller U100, a capacitor C3.0, a resistor R1.2, a capacitor C1.1, a fourteenth Zener diode D140, a variable resistor R1.1, a capacitor C1.2, a capacitor C1.3, and a diode D6; The first terminal of resistor R5.0 is electrically connected to the first terminal of the output current sampling resistor R800. The second terminal of resistor R5.0 is electrically connected to the first terminal of capacitor C4.0, the cathode of the thirteenth Zener diode D130, the first terminal of capacitor C9.0, and the IN- pin of microcontroller U100. The second terminal of capacitor C4.0 is electrically connected to the anode of the thirteenth Zener diode D130 and grounded. The first terminal of resistor R1.0 is electrically connected to the second terminal of the output current sampling resistor R800. The second terminal of resistor R1.0 is electrically connected to the first terminal of capacitor C1.1, the cathode of the fourteenth Zener diode D140, the second terminal of capacitor C9.0, and the IN+ pin of microcontroller U100. The second terminal of capacitor C1.1 is electrically connected to the anode of the fourteenth Zener diode D140 and grounded. The first terminal of resistor R2.0 is electrically connected to the first terminal of variable resistor R1.

1. The second terminal of resistor R2.0 is electrically connected to one J pin of microcontroller U100. The second terminal of variable resistor R1.1 is electrically connected to the other J pin of microcontroller U100. The +V pin of microcontroller U100 is electrically connected to the first terminal of capacitor C3.0 and the 5V power supply of the differential amplifier circuit. The OUT pin of microcontroller U100 is electrically connected to the first terminal of resistor R7. The REF pin of microcontroller U100 is electrically connected to the first terminals of resistor R1.2, capacitor C1.2, capacitor C1.3, and the anode of diode D6. The second terminal of the resistor R1.2 is electrically connected to the second terminal of the capacitor C1.2 and grounded. The cathode of the diode D6 is electrically connected to the second terminal of the capacitor C1.3 and the 5V power supply of the differential amplifier circuit.

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