A DC-DC converter based on an anti-radiation PWM controller chip C42603RHC

Abstract

A kind of DC-DC converter based on anti-radiation PWM controller chip C42603RHC, including main power circuit and control circuit, main power circuit is composed of input filter, primary side full bridge, secondary side current doubling rectification, current sampling and output filter circuit, control circuit with anti-radiation chip C42603RHC as core, equipped with two consistent primary side drive circuit, and the drive signal is isolated by transformer.The control chip used in the application is anti-radiation, supports primary and secondary side control and overvoltage, overcurrent protection and other functions;Discard the traditional drive chip, reduce volume and cost, power density reaches 6W / cm³;Conversion efficiency is as high as 91.91%, and simple structure, high reliability, good output performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of DC-DC conversion, and particularly relates to a DC-DC converter based on an anti-radiation PWM controller chip C42603RHC. BACKGROUND

[0002] With the continuous development of power electronic technology, modern industrialization and military defense have put forward higher requirements for DC-DC converters, and miniaturization, low weight, high power density, high efficiency and high reliability of DC-DC converters have gradually become the research focus and development trend. However, the technology and ability of developing and producing high-performance DC-DC converters in China are still lacking, and most high-end DC-DC converters still rely on imports. Domestic DC-DC converters are mostly used in the medium and low-end fields. Especially in the environment with high radiation, the on-state of the device is weak, and the efficiency is low. The efficiency of the DC-DC converter with anti-radiation is generally about 82% in domestic manufacturers. Moreover, the traditional module power supply is designed by using a driving chip. Although the driving chip has good driving capability, it increases the volume and cost of the module power supply. The power density of the traditional module power supply is 2.1 W / cm3, and the power density is low. SUMMARY

[0003] To solve the above technical problems, the application provides a DC-DC converter based on an anti-radiation PWM controller chip C42603RHC.

[0004] The application is realized by the following technical scheme.

[0005] The application provides a DC-DC converter based on an anti-radiation PWM controller chip C42603RHC, which comprises a main power circuit and a control circuit; the main power circuit comprises an input filter circuit, a primary full-bridge circuit, a secondary current doubling rectifier circuit, a current sampling circuit and an output filter circuit; the input filter circuit is connected with an input voltage VIN and connected with the primary full-bridge circuit; the secondary current doubling rectifier circuit comprises a transformer T1, the transformer T1 is connected with the primary full-bridge circuit, and the current sampling circuit comprises a mutual inductor CT1, the mutual inductor CT1 is connected with the primary full-bridge circuit; the input end of the output filter circuit is connected with the secondary current doubling rectifier circuit, and the output end is connected with an output voltage VO; the control circuit comprises an anti-radiation control chip C42603RHC, a primary side drive circuit 1 and a primary side drive circuit 2, the anti-radiation control chip C42603RHC is provided with a secondary side drive output SAH, SAL, SBH, SBL and signal ends CSRTN and CS; the current sampling circuit is connected with the signal ends CSRTN and CS, and provides a sampling signal for the anti-radiation control chip C42603RHC; the circuit structure of the primary side drive circuit 1 is consistent with that of the primary side drive circuit 2, the input signal of the primary side drive circuit 1 is OUTA from the anti-radiation control chip C42603RHC, and the output signal is SW1, DAH, PGND and DAL; the input signal of the primary side drive circuit 2 is OUTB from the anti-radiation control chip C42603RHC, and the output signal is SW2, DBH, PGND and DBL; the output signals SW1, DAH, DAL, SW2, DBH and DBL are all connected to the primary full-bridge circuit as control signals.

[0006] Further, the input filter circuit comprises capacitors C1-C4 and resistors R1-R2, one end of C1, R1 and C3 is connected with the input voltage VIN, the other end of C1, R1 and C3 is connected with one end of R2, one end of C2 and C4 is connected with one end of R2, and the other end of C2, R2 and C4 is grounded. Further, the primary full-bridge circuit comprises resistors R3-R6 and MOS tubes Q1-Q4, one end of R3 is connected with the gate of Q1 and the signal end DAH, the other end of R3 is connected with the source of Q1, the signal end SW1 and the same end of the primary side of the transformer T1, and the drain of Q1 is connected with the input voltage VIN; one end of R4 is connected with the gate of Q2 and the signal end DBL, the other end of R4 is connected with the source of Q2 and grounded, and the drain of Q2 is connected with the signal end SW1; one end of R5 is connected with the gate of Q3 and the signal end DBH, the other end of R5 is connected with the source of Q3, the signal end SW2, the primary side of the mutual inductor CT1 and the non-same end of the primary side of the transformer T1, and the drain of Q3 is connected with the input voltage VIN; one end of R6 is connected with the gate of Q4 and the signal end DAL, the other end of R6 is connected with the source of Q4 and grounded, and the drain of Q4 is connected with the signal end SW2.

[0007] Further, the secondary side current doubling rectifier circuit further comprises resistors R7-R12, MOS tubes Q5-Q6, diodes D1-D2, inductors L1-L2, one end of R7 is connected to signal end SAH, the other end is connected to the gate of Q5, the drain of Q5 is connected to the cathode of diode D1, the same end of transformer T1 and one end of inductor L1, the other end of inductor L1 is connected to output voltage VO; one end of R8 is connected to signal end SAL, the other end is connected to the gate of Q5 and one end of R9, the other end of R9 is connected to the source of Q5 and the anode of diode D1 and is grounded; one end of R12 is connected to signal end SBL, the other end is connected to the gate of Q6, the drain of Q6 is connected to the cathode of diode D2, the non-same end of transformer T1 and one end of inductor L2, the other end of inductor L2 is connected to output voltage VO; one end of R10 is connected to signal end SBH, the other end is connected to the gate of Q6 and one end of R11, the other end of R11 is connected to the source of Q6 and the anode of diode D2 and is grounded.

[0008] Further, the current sampling circuit further comprises diodes D3-D6, resistors R13-R16, capacitors C8-C9, the anode of D3 is connected to the same end of the secondary side of mutual inductor CT1 and the cathode of D4, the cathode of D3 is connected to the cathode of D5, one end of R13, one end of R14, one end of C8, one end of R15 and one end of R16; the other end of R15 is connected to signal end CS, the other end of R16 is connected to one end of C9 and signal end CSRTN; the anode of D5 is connected to the non-same end of the secondary side of mutual inductor CT1 and the cathode of D6; the anode of D4 is connected to the anode of D6, the other end of R13, the other end of R14, the other end of C8, the other end of C9 and is grounded.

[0009] Further, the primary side driving circuit 1 comprises resistors R17-R23, capacitors C10-C12, transformer T2, diodes D7-D9, one end of R17 is connected with signal end DAL and one end of R19, the other end is connected with one end of R18, the other end of R19, cathode of D7 and one end of C10, the other end of R18 is connected with the other end of C10 and the same end pin 4 of the primary side of transformer T2, anode of D7 is connected with the non-same end pin 3 of the primary side of transformer T2 and PGND; one end of R20 is connected with signal end DAH and one end of R22, the other end is connected with one end of R21, the other end of R22, cathode of D8 and one end of C11, the other end of R21 is connected with the other end of C11 and the same end pin 5 of the primary side of transformer T2, anode of D8 is connected with the non-same end pin 2 of the primary side of transformer T2 and signal end SW1; anode of D9 is connected with the same end pin 6 of the secondary side of transformer T2 and one end of C12, cathode of D9 is connected with the other end of C12 and one end of R23, the other end of R23 is connected with signal end OUTA, the non-same end pin 1 of the secondary side of transformer T2 is grounded.

[0010] Further, the output filter circuit comprises capacitors C5-C7, the C5, C6 and C7 are connected in parallel, and one end of the parallel connection is connected with output voltage VO and the other end is grounded.

[0011] Further, the control circuit further comprises an auxiliary power supply circuit and an overvoltage protection circuit, the auxiliary power supply circuit is connected with input voltage VIN and connected to anti-radiation PWM controller chip C42603RHC, and the overvoltage protection circuit is connected with output voltage VO and connected to anti-radiation PWM controller chip C42603RHC.

[0012] The application has the advantages that:

[0013] (1) the application is a DC-DC converter based on C42603RHC master control chip, the control chip has anti-radiation property, supports primary side control and secondary side control, and has multiple functions such as overvoltage protection, overcurrent protection and soft start function;

[0014] (2) the DC-DC converter discards the traditional driving chip, designs the primary side driving circuit, reduces the volume and cost of the DC-DC converter, and the power density is 6W / cm3;

[0015] (3) the DC-DC converter has simple structure, high reliability, good output performance, high conversion efficiency, and the efficiency is 91.91%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The application is the main power circuit topology;

[0017] Fig. 2 The control circuit of the application is connected as shown in the schematic diagram;

[0018] Fig. 3 The primary side drive circuit connection structure of the application is shown in the schematic diagram. DETAILED DESCRIPTION

[0019] The technical solutions of the application are further described below, but the scope of protection is not limited to the description.

[0020] As Figs. 1-3 shown, the application proposes a high-efficiency high-power-density DC-DC converter based on C42603RHC, which is composed of a main power circuit and a control circuit. The main power circuit includes an input filter circuit, a primary side full-bridge circuit, a secondary side current doubling rectifier circuit, a current sampling circuit, and an output filter circuit; the control circuit takes the control chip C42603RHC with anti-radiation as the core, and designs an auxiliary power supply circuit, an over-voltage protection circuit, an over-current protection circuit, a soft-start circuit, a voltage loop control circuit, a primary side drive circuit 1, a primary side drive circuit 2, and a secondary side drive output 8 peripheral circuit. The primary side drive circuit 1 and the primary side drive circuit 2 have the same structure, which includes 7 resistors, 3 capacitors, 3 diodes, and a transformer; the input signal of the primary side drive circuit 1 is OUTA, and the output signal is SW1, DAH, PGND, and DAL; the input signal of the primary side drive circuit 2 is OUTB, and the output signal is SW2, DBH, PGND, and DBL.

[0021] In the main power circuit, the input filter circuit includes 4 capacitors and 2 resistors, which filter out the interference signals at the input end, and R1 and R2 are used to balance the voltages across C1 and C2, and C3 and C4; the primary side full-bridge circuit is composed of 4 resistors and 4 MOS transistors, the switching tubes Q1 and Q4 form a bridge arm, and the switching tubes Q2 and Q3 form a bridge arm; when the MOS transistors Q1, Q2, Q3, and Q4 receive the driving signals DAH, DAL, DBH, and DBL from the control circuit, the switching tubes Q1 and Q4, and Q2 and Q3 alternately switch, and the input DC voltage is inverted into AC voltage; 4 resistors R3-R6 are added to charge or discharge the junction capacitance in the MOS transistor at the moment of turning on or turning off the MOS transistor Q1, Q2, Q3, and Q4, and to speed up the turning on or turning off of the MOS transistor; the primary side coil of the transformer T1 generates a voltage drop VIN, and the induced voltage VIN / n (n is the turns ratio of the transformer T) across the secondary side coil transforms the voltage and plays a safety isolation role;

[0022] The auxiliary side current doubling rectifier circuit is composed of 6 resistors, 2 MOS transistors and 2 inductors. When the MOS transistors Q5 and Q6 receive driving signals SAH, SAL, SBH and SBL from the control circuit, the switch transistors Q5 and Q6 convert the alternating voltage into direct current voltage; the resistors R9 and R11 charge or discharge the junction capacitor in the MOS transistors at the moment when the MOS transistors Q5 and Q6 are turned on or turned off, so as to accelerate the speed of turning on or turning off the MOS transistors; the resistors R7, R8, R10 and R12 are driving resistors for driving current limiting; the diodes D1 and D2 constitute an absorption circuit, which consumes the peak signal in the MOS transistors and reduces the peak problem of the output rectifier; the inductors L1 and L2 are added, so that the output inductance ripple currents offset each other, thereby reducing the output voltage ripple; the output filter circuit contains 3 capacitors, 2 ceramic capacitors and 1 tantalum capacitor, which filter the interference signals at the output end; the current sampling circuit is composed of 1 transformer CT1, 4 diodes D3-D6, 4 resistors R13-R16, 2 capacitors C8 and C9, which collect the primary side current of the converter T1 and rectify the collected alternating current signal into direct current signal, which is transmitted to the control circuit through the CSRTN end for overcurrent protection; the control circuit is transmitted through the CS end for control mode selection, and the voltage and current double closed loop control mode is selected, otherwise, if R15 is removed, the current loop control is closed, and at this time, the circuit is in voltage loop single closed loop control mode.

[0023] In a high-efficiency high-power-density DC-DC converter control circuit based on C42603RHC, the auxiliary power supply circuit is a flyback self-oscillation circuit, including two parts of self-oscillation and flyback conversion, which converts the input high voltage into working voltage for maintaining the working of the C42603RHC control chip; the overvoltage protection circuit functions to start the circuit when the voltage of the main power circuit is too high, protecting the DC-DC converter; the overcurrent protection circuit functions to start the circuit when the current of the main power circuit is too high, protecting the DC-DC converter; the soft start circuit adds resistors and capacitors to avoid hard start of the circuit and damage of the MOS tube; the voltage loop control circuit adds PI control, which is the main control mode of the DC-DC converter, and in addition, whether the current loop control mode needs to be added can be selected by controlling the resistor R15 at the CS end of the main power circuit; the control circuit outputs the primary side drive signals OUTA and OUTB, and since the primary side drive voltage is large, in order to better drive the MOS tubes Q1, Q2, Q3 and Q4, the DC-DC converter is designed with a primary side drive circuit, and the primary side drive circuit 1 and the primary side drive circuit 2 have the same structure; when the control circuit outputs the primary side drive signal OUTA, the primary side drive circuit 1 outputs the drive signals DAH, DAL, SW1 and PGND, controlling the opening and closing of the MOS tubes Q1 and Q4 of the main power circuit; when the control circuit outputs the primary side drive signal OUTB, the primary side drive circuit 2 outputs the drive signals DBH, DBL, SW2 and PGND, controlling the opening and closing of the MOS tubes Q2 and Q3 of the main power circuit; the control circuit outputs the secondary side drive signals SAH, SAL, SBH and SBL, controlling the opening and closing of the MOS tubes Q5 and Q6 of the main power circuit.

[0024] In a high-efficiency high-power-density DC-DC converter control circuit based on C42603RHC, the primary side drive circuit is composed of a transformer T2, seven resistors R17-R23, three capacitors C10-C12 and three diodes D7-D9; the transformer T2 isolates the drive signals OUTA and DAH, DAL, SW1 and PGND, the drive signals DAH and SW1 control the MOS tube Q1, the drive signals DAL and PGND control the MOS tube Q2, and the diodes D7-D9 function as freewheeling to quickly turn off the circuit; the resistor R17 limits the current, and R18-R23 are drive resistors.

Claims

1. A DC-DC converter based on an anti-radiation PWM controller chip C42603RHC, characterized in that: The main power circuit and the control circuit are included. The main power circuit includes an input filter circuit, a primary full-bridge circuit, a secondary current doubling rectifier circuit, a current sampling circuit and an output filter circuit; the input filter circuit is connected with an input voltage VIN and the primary full-bridge circuit; the secondary current doubling rectifier circuit includes a transformer T1 connected with the primary full-bridge circuit; the current sampling circuit includes a mutual inductor CT1 connected with the primary full-bridge circuit; the input end of the output filter circuit is connected with the secondary current doubling rectifier circuit, and the output end is connected with an output voltage VO. The control circuit includes an anti-radiation control chip C42603RHC, a primary side drive circuit (1) and a primary side drive circuit (2); the anti-radiation control chip C42603RHC is provided with secondary side drive outputs SAH, SAL, SBH, SBL and signal ends CSRTN and CS; the current sampling circuit is connected with the signal ends CSRTN and CS to provide a sampling signal for the anti-radiation control chip C42603RHC; The circuit structures of the primary side drive circuit (1) and the primary side drive circuit (2) are consistent; the input signal of the primary side drive circuit (1) is OUTA from the anti-radiation control chip C42603RHC, and the output signals are SW1, DAH, PGND and DAL; the input signal of the primary side drive circuit (2) is OUTB from the anti-radiation control chip C42603RHC, and the output signals are SW2, DBH, PGND and DBL; the output signals SW1, DAH, DAL, SW2, DBH and DBL are all connected to the primary full-bridge circuit as control signals; The primary side drive circuit (1) includes resistors R17-R23, capacitors C10-C12, a transformer T2 and diodes D7-D9, One end of R17 is connected with the signal end DAL and one end of R19, and the other end is connected with one end of R18, the other end of R19, the cathode of D7 and one end of C10; the other end of R18 is connected with the other end of C10 and the same name end pin 4 of the primary side of the transformer T2; the anode of D7 is connected with the non-same name end pin 3 of the primary side of the transformer T2 and PGND; One end of R20 is connected with the signal end DAH and one end of R22, and the other end is connected with one end of R21, the other end of R22, the cathode of D8 and one end of C11; the other end of R21 is connected with the other end of C11 and the same name end pin 5 of the primary side of the transformer T2; the anode of D8 is connected with the non-same name end pin 2 of the primary side of the transformer T2 and the signal end SW1; The anode of D9 is connected with the same name end pin 6 of the secondary side of the transformer T2 and one end of C12; the cathode of D9 is connected with the other end of C12 and one end of R23; the other end of R23 is connected with the signal end OUTA; and the non-same name end pin 1 of the secondary side of the transformer T2 is grounded.

2. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The input filter circuit comprises capacitors C1-C4 and resistors R1-R2, wherein one end of C1, R1 and C3 is connected to input voltage VIN, the other end of C1, R1 and C3 is connected to one end of R2, one end of C2 and C4 is connected to one end of R2, and the other end of C2, R2 and C4 is grounded.

3. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The primary full-bridge circuit comprises resistors R3-R6 and MOS transistors Q1-Q4, one end of R3 is connected to the gate of Q1 and signal end DAH, the other end of R3 is connected to the source of Q1, signal end SW1 and the same end of the primary side of transformer T1, and the drain of Q1 is connected to input voltage VIN; one end of R4 is connected to the gate of Q2 and signal end DBL, the other end of R4 is connected to the source of Q2 and grounded, and the drain of Q2 is connected to signal end SW1; one end of R5 is connected to the gate of Q3 and signal end DBH, the other end of R5 is connected to the source of Q3, signal end SW2, the primary side of mutual inductor CT1 and the non-same end of the primary side of transformer T1, and the drain of Q3 is connected to input voltage VIN; one end of R6 is connected to the gate of Q4 and signal end DAL, the other end of R6 is connected to the source of Q4 and grounded, and the drain of Q4 is connected to signal end SW2.

4. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The secondary side current doubling rectifier circuit further comprises resistors R7-R12, MOS transistors Q5-Q6, diodes D1-D2 and inductors L1-L2, one end of R7 is connected to signal end SAH, the other end of R7 is connected to the gate of Q5, the drain of Q5 is connected to the cathode of diode D1, the same end of transformer T1 and one end of inductor L1, and the other end of inductor L1 is connected to output voltage VO; one end of R8 is connected to signal end SAL, the other end of R8 is connected to the gate of Q5 and one end of R9, the other end of R9 is connected to the source of Q5 and the anode of diode D1 and grounded; one end of R12 is connected to signal end SBL, the other end of R12 is connected to the gate of Q6, the drain of Q6 is connected to the cathode of diode D2, the non-same end of transformer T1 and one end of inductor L2, and the other end of inductor L2 is connected to output voltage VO; one end of R10 is connected to signal end SBH, the other end of R10 is connected to the gate of Q6 and one end of R11, the other end of R11 is connected to the source of Q6 and the anode of diode D2 and grounded.

5. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The current sampling circuit further comprises diodes D3-D6, resistors R13-R16 and capacitors C8-C9, the anode of D3 is connected to the same end of the secondary side of mutual inductor CT1 and the cathode of D4, the cathode of D3 is connected to the cathode of D5, one end of R13, one end of R14, one end of C8, one end of R15 and one end of R16; the other end of R15 is connected to signal end CS, the other end of R16 is connected to one end of C9 and signal end CSRTN; the anode of D5 is connected to the non-same end of the secondary side of mutual inductor CT1 and the cathode of D6; the anode of D4 is connected to the anode of D6, the other end of R13, the other end of R14, the other end of C8, the other end of C9 and grounded.

6. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The output filter circuit comprises capacitors C5-C7, and C5, C6 and C7 are connected in parallel, one end of the parallel connection is connected to output voltage VO, and the other end is grounded.

7. The DC-DC converter based on the anti-radiation PWM controller chip C42603RHC according to claim 1, characterized in that: The control circuit further comprises an auxiliary power supply circuit and an overvoltage protection circuit, the auxiliary power supply circuit is connected with the input voltage VIN and connected to the anti-radiation PWM controller chip C42603RHC, and the overvoltage protection circuit is connected with the output voltage VO and connected to the anti-radiation PWM controller chip C42603RHC.

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