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CN-122001184-A - Low-power-consumption full-boost-ratio boost circuit and control method thereof

CN122001184ACN 122001184 ACN122001184 ACN 122001184ACN-122001184-A

Abstract

The invention relates to the technical field of direct current boosting, in particular to a low-power-consumption full-boosting-ratio boost circuit and a control method thereof. According to the invention, by controlling synchronous on-off of the main switching tube and the auxiliary switching tube and combining half-period free oscillation of the resonant capacitor, the auxiliary capacitor and the resonant inductor, the voltage of the resonant capacitor is forced to reversely overturn and stabilize at the input voltage Vin, so that the drain-source voltage of the main switching tube is ensured to gradually rise from zero starting to the output voltage Vout at the moment of switching off, the impact of the switching-off voltage and the switching loss are thoroughly eliminated, the effect is not influenced by the value of the boosting ratio, and the technical pain point that the ZVS is difficult to realize under the lower boosting ratio of the traditional boost circuit is solved.

Inventors

  • Request for anonymity
  • Request for anonymity

Assignees

  • 重庆御芯微信息技术有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The low-power-consumption full-boost-ratio boost circuit comprises an energy storage inductor, a main switching tube and a main diode, and is characterized by further comprising a resonant inductor, a resonant capacitor, an auxiliary switching tube, a second diode, a third diode and a fourth diode; One end of the energy storage inductor is respectively connected with the positive input end and the cathode of the second diode, and the other end of the energy storage inductor is respectively connected with the anode of the main diode, the anode of the fourth diode, one end of the resonance capacitor and one end of the main switching tube; The cathode of the main diode is connected with the positive output end, the anode of the second diode is connected with the other end of the resonant capacitor to form a first connection node, one end of the auxiliary capacitor is connected with the cathode of the fourth diode to form a second connection node, the resonant inductor, the third diode and the auxiliary switch tube are connected in series between the first connection node and the second connection node, and the other end of the main switch tube and the other end of the auxiliary capacitor are respectively connected with the negative input end.
  2. 2. The low-power-consumption full boost ratio boost circuit of claim 1, wherein the drain electrode of the auxiliary switching tube is connected to one end of the fourth diode and one end of the auxiliary capacitor, respectively, and the source electrode of the auxiliary switching tube is connected to one end of the resonant inductor.
  3. 3. The low power consumption full boost ratio boost circuit of claim 1, wherein the drain of the auxiliary switching tube is connected to one end of the resonant inductor, and the source of the auxiliary switching tube is connected to the anode of the third diode.
  4. 4. The low power consumption full boost ratio boost circuit of claim 1, wherein a drain of the auxiliary switching tube is connected with a cathode of the third diode, and a source of the auxiliary switching tube is connected with an anode of the second diode and one end of the resonant capacitor, respectively.
  5. 5. The low-power consumption full boost ratio boost circuit of any one of claims 2 to 4, wherein the turn-on timing of the auxiliary switching tube coincides with the turn-on timing of the main switching tube.
  6. 6. The low-power consumption full boost ratio boost circuit of claim 1, wherein the capacitance of the auxiliary capacitor is greater than or equal to 3 times the capacitance of the resonant capacitor.
  7. 7. The low power consumption full boost ratio boost circuit of claim 1, wherein half of the resonant period of the LC resonant circuit formed by the resonant inductor, the resonant capacitor and the auxiliary capacitor is shorter than the on time of the main switching tube.
  8. 8. The low power consumption full boost ratio boost circuit of claim 1, wherein the output voltage is greater than the input voltage and less than 2 times the input voltage.
  9. 9. The low power full boost ratio boost circuit of claim 1, wherein the current of the energy storage inductor drops to 0 during each PWM duty cycle to operate the low power full boost ratio boost circuit in a current interrupt mode.
  10. 10. A control method of a low-power-consumption full boost ratio boost circuit, characterized by being used for controlling the low-power-consumption full boost ratio boost circuit according to any one of claims 1 to 9, the control method comprising: The main switch tube and the auxiliary switch tube are controlled to be turned off, and the energy storage inductor charges the resonance capacitor and the auxiliary capacitor, so that the voltage of the resonance capacitor reaches Vout-Vin, and the voltage of the auxiliary capacitor reaches Vout; The main switching tube and the auxiliary switching tube are kept to be turned off, the current of the energy storage inductor is reduced to zero, the voltage on the resonance capacitor is kept to Vout-Vin, and the voltage on the auxiliary capacitor is kept to Vout; The main switching tube and the auxiliary switching tube are controlled to be conducted, free oscillation is conducted on an LC resonant circuit comprising the resonant capacitor, the auxiliary capacitor and the resonant inductor for half period, the voltage on the resonant capacitor is reversely turned from Vout-Vin to Vin, the voltage of the auxiliary capacitor is reduced to zero, and zero current conduction is achieved by the main switching tube; The main switching tube and the auxiliary switching tube are kept on, so that the energy storage inductor absorbs energy from input voltage, and current rises linearly; and controlling to turn off the main switching tube and the auxiliary switching tube, wherein the voltage at two ends of the resonant capacitor is Vin, and the drain-source voltage of the main switching tube rises from zero so as to realize zero-voltage turn-off, wherein Vin is input voltage and Vout is output voltage.

Description

Low-power-consumption full-boost-ratio boost circuit and control method thereof Technical Field The invention relates to the technical field of direct current boosting, in particular to a low-power-consumption full-boosting-ratio boost circuit and a control method thereof. Background The new energy source needs to perform direct current conversion DC-DC, wherein a boost circuit is the most commonly used circuit, and can boost the direct current voltage by one to several times. The conventional boost ZVS boost circuit is shown in fig. 1a, and can ensure complete ZVS when Q is turned off when the boost ratio > =3, and is shown in fig. 1b as a voltage-current diagram of Q, the turn-off power consumption is theoretically 0, but when the boost ratio is <3, the voltage-current diagram when Q is turned off is shown in fig. 1c, and an initial voltage Vo exists across Vds of Q, so that Q still has turn-off power consumption. In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art. Disclosure of Invention The invention aims to solve the technical problem that extra turn-off power consumption is easy to bring due to the influence of a boosting ratio in a traditional boost ZVS boosting circuit. The invention adopts the following technical scheme: the first aspect provides a low-power-consumption full-boost-ratio boost circuit, which comprises an energy storage inductor, a main switching tube, a main diode, a resonant inductor, a resonant capacitor, an auxiliary switching tube, a second diode, a third diode and a fourth diode; One end of the energy storage inductor is respectively connected with the positive input end and the cathode of the second diode, and the other end of the energy storage inductor is respectively connected with the anode of the main diode, the anode of the fourth diode, one end of the resonance capacitor and one end of the main switching tube; The cathode of the main diode is connected with the positive output end, the anode of the second diode is connected with the other end of the resonant capacitor to form a first connection node, one end of the auxiliary capacitor is connected with the cathode of the fourth diode to form a second connection node, the resonant inductor, the third diode and the auxiliary switching tube are connected in series between the first connection node and the second connection node, and the other end of the main switching tube and the other end of the auxiliary capacitor are respectively connected with the negative input end. Preferably, the drain electrode of the auxiliary switching tube is connected with one end of the fourth diode and one end of the auxiliary capacitor, and the source electrode of the auxiliary switching tube is connected with one end of the resonant inductor. Preferably, the drain electrode of the auxiliary switching tube is connected with one end of the resonant inductor, and the source electrode of the auxiliary switching tube is connected with the anode of the third diode. Preferably, the drain electrode of the auxiliary switching tube is connected with the cathode of the third diode, and the source electrode of the auxiliary switching tube is connected with the anode of the second diode and one end of the resonant capacitor respectively. Preferably, the conduction time sequence of the auxiliary switching tube is consistent with the conduction time sequence of the main switching tube. Preferably, the capacitance value of the auxiliary capacitor is greater than or equal to 3 times the capacitance value of the resonance capacitor. Preferably, in an LC resonant circuit formed by the resonant inductor, the resonant capacitor and the auxiliary capacitor, a half resonant period of the LC resonant circuit is smaller than a turn-on time of the main switching tube. Preferably, the output voltage is greater than the input voltage and less than 2 times the input voltage. Preferably, the current of the energy storage inductor is reduced to 0 in each PWM working period, so that the low-power-consumption full boost ratio boost circuit works in a current interrupt mode. In a second aspect, a control method of a low-power-consumption full boost ratio boost circuit is provided, for controlling the low-power-consumption full boost ratio boost circuit according to the first aspect, the control method comprising: The main switch tube and the auxiliary switch tube are controlled to be turned off, and the energy storage inductor charges the resonance capacitor and the auxiliary capacitor, so that the voltage of the resonance capacitor reaches Vout-Vin, and the voltage of the auxiliary capacitor reaches Vout; The main switching tube and the auxiliary switching tube are kept to be turned off, the current of the energy storage inductor is reduced to zero, the voltage on the resonance capacitor is kept to Vout-Vin, and the voltage on the auxiliary capacitor is kept to Vout; The main switching tube and the auxiliary switching tube are