Applicable products: HQ-MN113-3K6-MA / HQ-MN113-3K6-ML, etc.
I. Circuit Overview
1. Load circuits of each auxiliary power supply
Auxiliary power output port | Load circuit |
Primary side 12V | Relay circuit, secondary output LLCMOS driver circuit, main output LLCMOS driver circuit, primary side 12V to 5V voltage regulator circuit, PFCMOS driver circuit |
Primary side 5V | From the output LLCMOS driver circuit, ambient temperature detection circuit, PFC current detection circuit, and primary side 5V to 3.3V voltage regulator circuit. |
Primary side 3.3V | Primary side 3.3V power supply indicator circuit, PFC DSP circuit, primary and secondary side communication circuit, PFC MOS waveform detection circuit, PFC current detection/overcurrent protection circuit, PFC temperature detection circuit, secondary output overvoltage protection circuit, secondary output overcurrent protection circuit, secondary output voltage loop circuit |
Secondary side 12V | Secondary side 12V to 5V voltage regulator circuit, main output LLCMOS driver circuit, main output-output MOS driver circuit |
Secondary side 5V | Output current sampling circuit, output overvoltage protection circuit, output overcurrent protection circuit, main output current sampling circuit, secondary side 5V to 3.3V voltage regulator circuit |
Secondary side 3.3V | Fan control circuit, main output LLCMOS temperature sampling circuit, main output voltage sampling circuit, main output LLCMOS driver circuit, secondary side DSP circuit, secondary side EEPROM and IIC communication circuit, secondary side 3.3V power indicator circuit, primary and secondary side communication circuit, secondary output overcurrent protection circuit, secondary output overvoltage protection circuit, main output current sampling circuit |
II. Circuit Fault Phenomena
Circuit Name | Possible failure phenomenons |
Input series circuit | No voltage is supplied to the PFC, and the entire machine has no power |
Abnormal startup time (especially abnormal resistance values of NTC1 and NTC2) | |
Input short circuit | |
Input filter circuit | PFC has no voltage input, the entire machine is without power |
Abnormal startup time (especially abnormal resistance values of NTC1 and NTC2) | |
Input short circuit | |
Abnormal AC input current waveform | |
PFC-AC voltage sampling circuit - input voltage divider circuit | AC voltage sampling value abnormal |
Unable to power on | |
Busbar voltage abnormal | |
Abnormal AC voltage sampling accuracy | |
Abnormal PF and ATHD values | |
PFC-AC voltage sampling circuit | AC voltage sampling value abnormal |
Unable to power on | |
Busbar voltage abnormal | |
Abnormal AC voltage sampling accuracy | |
Abnormal PF and ATHD values | |
PFC - Input current sampling circuit - Sampling resistor | Input current sample value is abnormal |
Unable to power on, the entire device has no power | |
PFC overcurrent protection failed | |
Abnormal AC input current waveform | |
PSU is making unusual noises | |
Abnormal PF and ATHD values | |
Abnormal overall efficiency | |
PFC current sampling accuracy is abnormal | |
PSU shuts down due to protection mechanisms when a certain load is applied | |
PFC - Bus voltage detection - Input voltage divider circuit | Busbar voltage sampling value is abnormal |
The actual value of the busbar capacitance is abnormal | |
Overvoltage on the busbar capacitor caused damage | |
Unable to power on | |
The device shuts down after being turned on for a short time | |
Busbar capacitor voltage ripple is abnormal | |
PFC bus voltage sampling circuit | Busbar voltage sampling value is abnormal |
The actual value of the busbar capacitance is abnormal | |
Overvoltage on the busbar capacitor caused damage | |
Unable to power on | |
The device shuts down after being turned on for a short time | |
Busbar capacitor voltage ripple is abnormal | |
PFC-MOS waveform detection circuit - voltage divider resistor | Unable to power on |
Abnormal AC input current waveform | |
The power supply is making unusual noises | |
Abnormal PF and ATHD values | |
Abnormal overall efficiency | |
PFC power circuit damaged | |
PFC-MOS waveform detection circuit | Unable to power on |
Abnormal AC input current waveform | |
The power supply is making unusual noises | |
Abnormal PF and ATHD values | |
Abnormal overall efficiency | |
PFC power circuit damaged | |
PFC - Power Circuit | Input short circuit |
Busbar short circuit | |
Busbar voltage abnormal | |
Abnormal overall efficiency | |
Abnormal PF and ATHD values | |
Main output/Slave output: No output | |
Unable to power on, the entire machine has no power | |
PFC-MOS driver circuit | Main output cannot be powered on |
Busbar voltage abnormal | |
Abnormal overall efficiency | |
Abnormal PF and ATHD values | |
PFC power circuit damaged | |
PFC-relay circuit | The relay does not close or open |
The input surge current is too high, or the startup time is too short | |
NTC1 and NTC2 are damaged | |
PFC - Bus capacitor | Abnormal main output/slave output voltage ripple |
PFC-DSP circuit | Software flashing failed |
PFC - Peripheral indicator light shows abnormality | |
Slave output - Unable to power on | |
The PFC circuit is malfunctioning | |
PFC-DSP programming interface circuit | Software flashing failed |
PFC-MOS temperature detection circuit | PFC temperature sampling value is abnormal |
Unable to power on | |
Main output/slave output - shutdown protection after warm-up | |
PFC - Peripheral indicator light / Primary side 3.3V power supply indicator light | The indicator light shows an abnormality |
Main output - LLC power circuit | Main output - No output |
Abnormal overall efficiency | |
Main output voltage abnormal | |
The main output voltage ripple is abnormal | |
The main output LLC power circuit is damaged, or the PFC power circuit is also damaged | |
Main output LLCMOS stress anomaly | |
Main output - LLC MOS driver circuit | Main output - No output |
Abnormal overall efficiency | |
Main output voltage abnormal | |
The main output voltage ripple is abnormal | |
The main output LLC power circuit is damaged, or the PFC power circuit is also damaged | |
Main output LLCMOS stress anomaly | |
Main output - output stage power circuit | Main output - No output |
Output short circuit | |
Abnormal overall efficiency | |
Main output voltage abnormal | |
The main output voltage ripple is abnormal | |
Main output: Output MOSFET stress is abnormal | |
Main output - Output MOSFET driver circuit | Main output - no output |
Overall efficiency is abnormal | |
Main output voltage is abnormal | |
Main output voltage ripple is abnormal | |
Main output MOSFET stress is abnormal | |
The main output MOSFET is damaged, or the PFC power circuit and LLC power circuit are also damaged | |
Main output - output current sampling resistor | Main output - no output |
Main output - Output current sampling value abnormal | |
Main output - early shutdown protection under load | |
Main output - Overcurrent protection point is too large or not protected | |
Main output - current accuracy abnormal | |
Main output - Output current sampling circuit | Main output - no output |
Main output - Output current sampling value abnormal | |
Main output - early shutdown protection under load | |
Main output - Overcurrent protection point is too large or not protected | |
Main output - current accuracy abnormal | |
Main output - Output voltage sampling circuit | Main output - no output |
Main output - Output voltage sampling value abnormal | |
Main output - Actual output voltage too high or too low | |
The main output voltage ripple is abnormal | |
Abnormal overall efficiency | |
Main output - Output voltage accuracy abnormal | |
Main output - Early shutdown protection when output voltage rises | |
Main output - LLCMOS temperature sampling circuit | DCDC temperature sampling value is abnormal |
Main output - No output | |
Main output - shutdown protection after warm-up | |
Slave output-power circuit | Slave output-no output |
Abnormal overall efficiency | |
Slave output voltage anomaly | |
Slave output voltage ripple is abnormal. | |
Slave output LLC power circuit failure, or associated damage to PFC power circuit | |
Slave output LLCMOS stress anomaly | |
From the output - LLC MOS driver circuit | Slave output-no output |
Abnormal overall efficiency | |
Slave output voltage anomaly | |
Slave output voltage ripple is abnormal. | |
Slave output LLC power circuit failure, or associated damage to PFC power circuit | |
Slave output LLCMOS stress anomaly | |
Slave output-output current sampling circuit | Slave output-no output |
Slave output-Early shutdown protection under load | |
Slave output-Overload overcurrent protection point is too large or not protected | |
Slave output-Output overcurrent protection circuit | Slave output-no output |
Slave output-Early shutdown protection under load | |
Slave output-Overload overcurrent protection point is too large or not protected | |
Slave output-Output MOS control circuit | Slave output-no output |
Abnormal overall efficiency | |
Slave output-Voltage anomaly | |
Slave output-Voltage ripple anomaly | |
Slave output-Output MOS transistor stress is abnormal | |
Slave output-The output MOSFET is damaged, or the PFC power circuit and LLC power circuit are also damaged | |
Slave output-Voltage detection circuit | Slave output-no output |
Slave output-The voltage sampling value is abnormal | |
Slave output-The reported output voltage accuracy is abnormal | |
Slave output-The shutdown protection was triggered during startup | |
Slave output-Overvoltage protection circuit | Slave output-no output |
Slave output-The shutdown protection was triggered during startup | |
Slave output-Output voltage has no overvoltage protection or the protection point is too high | |
Slave output-Output voltage loop circuit | Slave output-no output |
Slave output-Power-on overvoltage protection | |
Slave output-The actual output voltage is too high or too low | |
Slave output-Voltage ripple anomaly | |
Abnormal overall efficiency | |
Slave output-Output voltage accuracy is abnormal | |
Auxiliary power supply circuit | Main output or slave output - no output |
Abnormal output voltages of auxiliary power supply | |
Its power supply circuits are malfunctioning | |
The primary/secondary 3.3V power supply indicator light is showing an abnormality | |
Auxiliary power supply - input undervoltage protection circuit | The auxiliary power supply undervoltage protection point is abnormal, either too high or too low |
The auxiliary power source is not working, and the whole machine has no output | |
The primary/secondary 3.3V power supply indicator light is showing an abnormality | |
Auxiliary power supply - Primary side 12V to 5V regulated voltage circuit | Auxiliary power supply primary side 5V voltage abnormal |
The circuits powered by the primary 5V supply are malfunctioning | |
The primary side 3.3V power indicator light is showing an abnormal status | |
Auxiliary power supply - Primary side 5V to 3.3V voltage regulator circuit | The 3.3V voltage on the primary side of the auxiliary power supply is abnormal |
The circuits powered by the primary 3.3V supply are malfunctioning | |
The primary side 3.3V power indicator light is showing an abnormal status | |
Auxiliary power supply - Primary side 3.3V power supply circuit | All the circuits powered by it are malfunctioning |
Auxiliary power supply - secondary side 12V to 5V voltage regulator circuit | The 5V voltage on the secondary side of the auxiliary power supply is abnormal |
All the circuits powered by the 5V supply on the secondary side are malfunctioning | |
The 3.3V power indicator light on the secondary side is showing an abnormality | |
Auxiliary power supply - secondary side 5V to 3.3V voltage regulator circuit | The 3.3V voltage on the secondary side of the auxiliary power supply is abnormal |
The various circuits powered by the 3.3V supply on the secondary side are malfunctioning | |
The 3.3V power indicator light on the secondary side is showing an abnormality | |
Auxiliary power supply - secondary side - 3.3V power supply circuit | All the circuits powered by it are malfunctioning |
Secondary side - EEPROM - IIC circuit | Overall IIC communication failure |
The host computer reports an "EEPROM failure" | |
Main output - unable to power on | |
Secondary side - DSP circuit | Software flashing failed |
Main output - unable to power on | |
The secondary circuit is malfunctioning | |
Secondary side - DSP programming port circuit | Secondary side DSP program flashing failed |
Secondary side - CAN communication interface circuit | The entire system's CAN communication is abnormal |
Secondary side - 3.3V power indicator light | The indicator light shows an abnormality |
Primary-to-secondary side DSP communication circuit | The data displayed on the host computer regarding the PFC terminal is abnormal |
Main output - unable to power on | |
Ambient temperature sampling circuit | The ambient temperature sampling value is abnormal |
Unable to power on | |
Main output/Auxiliary output - Shutdown protection after overheating | |
Fan control circuit | The fan is not working |
The fan is malfunctioning | |
From the output - unable to power on |
III. Circuit PCB Location Breakdown
Input series circuit
Input filter circuit
PFC-AC voltage sampling circuit - input voltage divider circuit
PFC-AC voltage sampling circuit
PFC - Input current sampling circuit - Sampling resistor
PFC - Input current sampling circuit
PFC - Bus voltage detection - Input voltage divider circuit
PFC bus voltage sampling circuit
PFC-MOS waveform detection circuit - voltage divider resistor
PFC-MOS waveform detection circuit
PFC - Power Circuit
PFC-MOS driver circuit
PFC-relay circuit
PFC - Bus capacitor
PFC-DSP circuit
PFC-DSP programming interface circuit
PFC-MOS temperature detection circuit
PFC - Peripheral indicator light / Primary side 3.3V power supply indicator light
PFC - Peripheral indicator light / Primary side 3.3V power supply indicator light
Main output - LLC MOS driver circuit
Main output - output stage power circuit
Main output - Output MOSFET driver circuit
Main output - output current sampling resistor
Main output - Output current sampling circuit
Main output - Output voltage sampling circuit
Main output - LLCMOS temperature sampling circuit
Slave output-power circuit
Slave output - LLC MOS driver circuit
Slave output-to-output MOS control circuit
Slave output-output current sampling circuit
Slave output-to-output overcurrent protection circuit
Slave output-voltage detection circuit
Slave output - overvoltage protection circuit
Slave output-output voltage loop circuit
Auxiliary power supply circuit
Auxiliary power supply - input undervoltage protection circuit
Auxiliary power supply - Primary side 12V to 5V regulated voltage circuit
Auxiliary power supply - Primary side 5V to 3.3V voltage regulator circuit
Auxiliary power supply - Primary side 3.3V power supply circuit
Auxiliary power supply - 12V to 5V voltage regulator circuit on the secondary side
Auxiliary power supply - secondary side 5V to 3.3V voltage regulator circuit
Auxiliary power supply - secondary side - 3.3V power supply circuit
Secondary side - EEPROM - IIC circuit
Secondary side - DSP circuit
Secondary side - DSP programming port circuit
Secondary side - CAN communication interface circuit
Primary-to-secondary side DSP communication circuit
Secondary side - 3.3V power indicator light
Ambient temperature sampling circuit
Fan control circuit
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