CN-115811234-B - Low-cost resonant busbar converter control method based on single chip microcomputer

CN115811234BCN 115811234 BCN115811234 BCN 115811234BCN-115811234-B

Abstract

The invention provides a control method of a low-cost resonant busbar transducer based on a singlechip, which comprises the steps that after the singlechip is electrified, a digital control unit initializes an internal clock, an I/O port and a PWM signal of the singlechip, the busbar transducer enters a standby state, after receiving a remote starting command, the digital control unit firstly judges the fault state of the busbar transducer, if the busbar transducer has a fault, the busbar transducer returns to the standby state, does not respond to the starting command, and enters a soft starting process if the busbar transducer has no fault, the digital control unit sends a driver control signal, the driver control unit amplifies and controls the busbar transducer to complete soft starting, and after entering a normal working state, the digital control unit judges the fault state of the busbar transducer again, and if the busbar transducer has a fault, the resonant busbar transducer is controlled to enter the standby state. The invention improves the reliability of the resonant bus converter.

Inventors

ZHANG JUN
WANG JIE
QIAO ZHAOYANG

Assignees

中国船舶集团有限公司第七二三研究所

Dates

Publication Date: 20260512
Application Date: 20221214

Claims (4)

1. The control method of the low-cost resonant bus converter based on the singlechip is characterized by comprising the steps of: After power-on, the digital control unit initializes an internal clock, an I/O port and PWM signals of the singlechip, and the bus converter enters a standby state; after receiving the remote start command, the digital control unit firstly judges the fault state of the bus converter, and returns to the standby state if the fault exists, and does not respond to the start command, if the fault does not exist, the bus converter enters a soft start process; after entering a normal working state, the digital control unit judges the fault state of the bus converter again, and if the fault exists, the resonant bus converter is controlled to enter a standby state; Wherein: The digital control unit generates high-frequency complementary pulse with dead zone, wherein PWM1 and PWM2 are complementary, the primary switching tube is controlled to be switched on and off after being amplified by the drive control unit, PWM3 and PWM4 are complementary, and the secondary synchronous rectifying tube is controlled to be switched on and off after being amplified by the drive control unit; In the soft start process, the duty ratio of PWM1, PWM2, PWM3 and PWM4 output by the digital control unit is gradually increased from 10% to 100%, the switching frequency f is reduced to the resonant frequency f r from twice the resonant frequency f r , when the output capacitor voltage V out reaches 90% of the set output voltage, the bus converter is in a soft start state and enters a normal working state, and the digital control unit outputs PWM1, PWM2, PWM3 and PWM4 signals with the frequency f r ; After entering a normal working state, the digital control unit judges the fault state of the bus converter again, when the bus converter fails, the digital control unit firstly sends out a driving control signal to turn off the output of the driving control unit and turn off the bus converter, then delays to turn off an internal PWM clock, stops the signal output of PWM1, PWM2, PWM3 and PWM4, enters a standby state and waits for the next starting control signal.
2. The method for controlling a low-cost resonant bus converter based on a single chip microcomputer according to claim 1, wherein the digital control unit judges the fault state of the bus converter itself, namely, carries out software judgment according to an input voltage V in , an output voltage V out , a current I out and a primary current signal I Lr, .
3. The control method of the low-cost resonant busbar converter based on the single chip microcomputer according to claim 1, wherein the digital control unit detects the voltage Vout on the output capacitor and the primary side current I Lr , coordinates and controls the change speed of the switching frequency f and the PWM duty ratio, and reduces the current stress of the primary side switching tube and the current peak value of the input power supply.
4. A low-cost resonant bus converter control system based on a single-chip microcomputer, which is characterized in that the control method based on the resonant bus converter of any one of claims 1-3 realizes the control of the low-cost resonant bus converter based on the single-chip microcomputer.

Description

Low-cost resonant busbar converter control method based on single chip microcomputer Technical Field The invention relates to a power supply conversion technology, in particular to a power supply resonant busbar converter control technology with a communication function, which is applied to a power supply system of communication, guidance and electronic countermeasure equipment. Background With the large-scale application of the distributed power supply system in the radar and comprehensive radio frequency active array system, the power density, efficiency, cost performance and the like of the bus converter in the distributed power supply system are higher, real-time monitoring and communication functions are required, the existing high-power density bus converter mostly adopts a hard switching circuit topology, the switching frequency is improved while switching loss is greatly increased, the efficiency of the bus converter is reduced, the existing bus converter basically adopts analog chip control, the communication control chip is required to be independently increased to realize the real-time monitoring and communication functions while the power density and the efficiency are improved, the complexity of the system is increased, the existing digital converter adopts a software turn-off mode, transient uncertainty of an output port can possibly appear when a turn-off program is operated, faults of the resonant bus converter are further enlarged, and the existing bus converter soft start mode is realized by PWM pulse width adjustment and is not applicable to the resonant bus converter topology. Disclosure of Invention The invention aims to provide a control method of a low-cost resonant busbar transducer based on a singlechip. The technical scheme for realizing the purpose of the invention is that the control method of the low-cost resonant bus converter based on the singlechip realizes the control of the half-bridge resonant bus converter through a digital control unit and a driving control unit, and comprises the following steps: After power-on, the digital control unit initializes an internal clock, an I/O port and PWM signals of the singlechip, and the bus converter enters a standby state; after receiving the remote start command, the digital control unit firstly judges the fault state of the bus converter, and returns to the standby state if the fault exists, and does not respond to the start command, if the fault does not exist, the bus converter enters a soft start process; After entering into normal working state, the digital control unit judges the fault state of the bus converter again, and if the fault exists, the resonant bus converter is controlled to enter into standby state. Further, the digital control unit generates high-frequency complementary pulse with dead zone, wherein PWM1 and PWM2 are complementary, the primary switching tube is controlled to be switched on and off after being amplified by the drive control unit, PWM3 and PWM4 are complementary, and the secondary synchronous rectifying tube is controlled to be switched on and off after being amplified by the drive control unit. Further, the digital control unit determines the fault state of the bus converter, that is, performs software determination according to the input voltage V in, the output voltage V out, the current I out and the primary current signal I Lr. Further, in the soft start process, the duty ratios of PWM1, PWM2, PWM3 and PWM4 output by the digital control unit are gradually increased from 10% to 100%, the switching frequency f is reduced from twice the resonant frequency f r to the resonant frequency f r, when the output capacitor voltage V out reaches 90% of the set output voltage, the bus converter completes the soft start state and enters the normal working state, and the digital control unit outputs PWM1, PWM2, PWM3 and PWM4 signals with the frequency f r. Furthermore, the digital control unit detects the voltage Vout on the output capacitor and the primary side current I Lr, coordinates and controls the change speed of the switching frequency f and the PWM duty ratio, and reduces the current stress of the primary side switching tube and the current peak value of the input power supply. Further, after entering a normal working state, the digital control unit judges the fault state of the busbar transducer again, when the busbar transducer has faults, the digital control unit firstly sends out a driving control signal to turn off the output of the driving control unit to turn off the busbar transducer, then delays to turn off an internal PWM clock, stops the signal output of PWM1, PWM2, PWM3 and PWM4, enters a standby state and waits for the next starting control signal. A control system of a low-cost resonant bus converter based on a singlechip realizes the control of the low-cost resonant bus converter based on the singlechip based on the control method of the resonant bus converter. Compared with the prior