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US 12,407,267 B2Granted
Switching power supply system with both analog and digital feedback
AssigneeMix-Design Semiconductor Technologies Ltd.
InventorWanle Liu
Life of this patent
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Abstract
The present application discloses a switching power supply system with both analog and digital feedback, the steps for regulating an output voltage of the switching power supply system are as follows: indirectly obtaining the system output voltage on a primary side of the switch power supply, and regulating the output voltage for a first time by controlling a primary switch tuber; directly obtaining an actual output voltage of the system on a secondary side of the switching power supply, obtaining a voltage difference between the actual output voltage of the system and a load demand voltage, and regulating the output voltage secondary according to the voltage difference.
Claims9
A switching power supply system with both analog and digital feedback, wherein the switching power supply system is configured to regulate an output voltage Vout, comprising:
- a first primary analog feedback signal sampling and processing module, a first pulse-frequency modulation/pulse-width modulation (PFM/PWM) control signal generating and driving module, a first secondary digital feedback signal sampling and driving module, a first isolation transmission module, and a first secondary digital feedback signal decoding and reference generating module;
- the first primary analog feedback signal sampling and processing module is configured to sample a feedback voltage of an auxiliary winding on a primary side, generate a corresponding feedback signal after processing a current feedback voltage, and output the corresponding feedback signal to the first PFM/PWM control signal generating and driving module;
- the first PFM/PWM control signal generating and driving module is configured to control an on/off time of a primary switch tube according to the corresponding feedback signal, and regulate the output voltage Vout, so that a value of the output voltage Vout approaches a demand voltage Vreq value of a load;
- the first secondary digital feedback signal sampling and driving module is configured to directly obtain an actual output voltage of the switching power supply system on a secondary side, generate a secondary digital feedback signal after processing the actual output voltage, and transmit the secondary digital feedback signal to the first secondary digital feedback signal decoding and reference generating module through the first isolation transmission module;
- the first secondary digital feedback signal decoding and reference generating module is configured to generate a corresponding voltage reference signal according to the secondary digital feedback signal, and output the corresponding voltage reference signal to the first PFM/PWM control signal generating and driving module;
- the first PFM/PWM control signal generating and driving module is further configured to control the on/off time of the primary switch tube according to the corresponding voltage reference signal, and further regulate the output voltage Vout;
- the first secondary digital feedback signal sampling and driving module comprises a first analog-to-digital converter (ADC) circuit, a first digital processing and reference controlling logic circuit, a first digital feedback signal generating circuit, and a first digital feedback signal driving circuit;
- the first ADC circuit is configured to directly obtain the actual output voltage of the switching power supply system on the secondary side, and convert the actual output voltage into a corresponding digital signal and output the corresponding digital signal to the first digital processing and reference controlling logic circuit;
- the first digital processing and reference controlling logic circuit is configured to obtain the actual output voltage according to the corresponding digital signal, comparing the actual output voltage with the demand voltage Vreq value of the load, and obtain a voltage difference ΔV after processing, the voltage difference ΔV is output to the first digital feedback signal generating circuit;
- the first digital feedback signal generating circuit is configured to generate a digital feedback signal according to the voltage difference ΔV, and output the digital feedback signal to the first digital feedback signal driving circuit;
- and
- the first digital feedback signal driving circuit is configured to drive the first isolation transmission module according to the digital feedback signal, and transmit the secondary digital feedback signal to the first secondary digital feedback signal decoding and reference generating module.
9 more elements
A switching power supply system with both analog and digital feedback, the switching power supply system is configured to regulate an output current Iout, wherein the switching power supply system comprises:
- a second analog collecting and regulating module, a second secondary digital feedback signal sampling and driving module, a second isolation transmission module, and a second secondary digital feedback signal decoding and reference generating module;
- the second analog collecting and regulating module is configured to collect a peak current on a primary side, determine the output current Iout of the switching power supply system according to the peak current, control an on/off time of a primary switch tube according to the output current Iout, regulate the output current Iout and make a value of the output current Iout approach a preset maximum current Imax value;
- the second secondary digital feedback signal sampling and driving module is configured to directly obtain a system output current signal on a secondary side, and generate a secondary digital feedback signal after processing according to the system output current signal and the preset maximum current Imax value, the secondary digital feedback signal is transmitted to the second secondary digital feedback signal decoding and reference generating module through the second isolation transmission module;
- the second secondary digital feedback signal decoding and reference generating module is configured to generate a corresponding current reference signal according to the secondary digital feedback signal, and output the corresponding current reference signal to the second analog collecting and regulating module;
- the second analog collecting and regulating module is further configured to update a preset reference current according to the corresponding current reference signal to yield an updated reference current, control the on/off time of the primary switch tube according to the updated reference current, and further regulate the output current Iout;
- a value of the preset reference current is equal to the preset maximum current Imax value,
- the second secondary digital feedback signal sampling and driving module comprises a second current collecting and processing circuit, a second analog-to-digital converter (ADC) circuit, a second digital processing and reference controlling logic circuit, a second digital feedback signal generating circuit, and a second digital feedback signal driving circuit;
- the second current collecting and processing circuit is configured to directly obtain the system output current signal on the secondary side, and output the system output current signal to the second ADC circuit;
- the second ADC circuit is configured to convert the system output current signal into a corresponding digital signal, and output the corresponding digital signal to the second digital processing and reference controlling logic circuit;
- the second digital processing and reference controlling logic circuit is configured to obtain the system output current signal according to the corresponding digital signal, compare the system output current signal with the preset maximum current Imax value, and obtain a current difference ΔI after processing, and output the current difference ΔI to the second digital feedback signal generating circuit;
- the second digital feedback signal generating circuit is configured to generate the secondary digital feedback signal according to the current difference ΔI, and output the secondary digital feedback signal to the second digital feedback signal driving circuit;
- and
- the second digital feedback signal driving circuit is configured to drive the second isolation transmission module according to the secondary digital feedback signal, and transmit the secondary digital feedback signal to the second secondary digital feedback signal decoding and reference generating module.
10 more elements
Dependencies are inferred from the claim text.