CN111490691A

CN111490691A - Adaptive boosting apparatus and method

Info

Publication number: CN111490691A
Application number: CN202010436844.6A
Authority: CN
Inventors: 张洪; 石泽发; 徐明章; 涂小平
Original assignee: Sichuan Hongmei Intelligent Technology Co Ltd
Current assignee: Sichuan Hongmei Intelligent Technology Co Ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-08-04

Abstract

The invention provides a self-adaptive boosting device and a method, wherein the self-adaptive boosting device comprises: the self-adaptive feedback circuit comprises a rectifying circuit, a booster circuit, a drive control circuit and a self-adaptive feedback circuit; the rectifying circuit is used for converting externally input alternating current into low-voltage direct current and transmitting the low-voltage direct current to the boosting circuit; the self-adaptive feedback circuit is used for detecting the voltage of the alternating current input into the rectifying circuit and transmitting a corresponding feedback signal to the drive control circuit according to the voltage of the alternating current; the driving control circuit is used for generating a corresponding PWM control signal according to the feedback signal transmitted by the self-adaptive feedback circuit and transmitting the PWM control signal to the booster circuit; and the boosting circuit is used for converting the low-voltage direct current from the rectifying circuit into the high-voltage direct current according to a corresponding boosting ratio according to the PWM control signal from the drive control circuit. The scheme can improve the conversion efficiency when alternating current is converted into high direct current voltage.

Description

Adaptive boosting apparatus and method

Technical Field

The invention relates to the technical field of electrical engineering, in particular to a self-adaptive boosting device and a self-adaptive boosting method.

Background

The Power Factor Correction (PFC) circuit can improve the utilization rate of electric Power of the electronic Power equipment to commercial Power when alternating current is converted into direct current, reduce the loss of electric Power in the process of converting alternating current into direct current, and save energy, and on the other hand, the harmonic pollution of the electronic Power equipment to a Power grid can be reduced through the PFC circuit. Household air conditioners, high-power freezers, high-power refrigeration equipment and the like are all refrigerated through a variable frequency compressor, the variable frequency compressor usually collects high direct current voltage for control, and the high direct current voltage is obtained through a PFC booster circuit.

When the high direct current voltage is obtained through the conventional PFC booster circuit, the PFC booster circuit detects the output voltage through the voltage feedback circuit, but cannot detect the input voltage range, so that the output voltage range cannot be adjusted according to the input voltage range, and only single voltage output can be controlled.

When converting ac into dc, different input voltages have different optimal boosting ratios, and when converting input ac into output dc, the conversion efficiency is the highest based on the optimal boosting ratios.

Chinese patent application No. 201910622849.5 discloses a PFC circuit and an air conditioner, where the PFC circuit includes a reactor, a rectifier circuit, a PFC driver circuit, and a PFC switch circuit, and outputs a voltage of a fixed magnitude under the interaction between the PFC driver circuit and the PFC switch circuit, and a step-up ratio when an alternating current is converted into a direct current cannot be adjusted.

Disclosure of Invention

The embodiment of the invention provides a self-adaptive boosting device and method, which can improve the conversion efficiency when alternating current is converted into high direct current voltage.

In a first aspect, an embodiment of the present invention provides an adaptive boost device, including: the self-adaptive feedback circuit comprises a rectifying circuit, a booster circuit, a drive control circuit and a self-adaptive feedback circuit;

the rectifying circuit is respectively connected with the booster circuit and the drive control circuit;

the driving control circuit is respectively connected with the booster circuit and the self-adaptive feedback circuit;

the rectifying circuit is used for converting externally input alternating current into low-voltage direct current and transmitting the low-voltage direct current to the booster circuit;

the self-adaptive feedback circuit is used for detecting the voltage of the alternating current input into the rectifying circuit and transmitting a corresponding feedback signal to the drive control circuit according to the voltage of the alternating current;

the driving control circuit is used for generating a corresponding PWM control signal according to the feedback signal from the self-adaptive feedback circuit and transmitting the PWM control signal to the booster circuit;

and the boost circuit is used for converting the low-voltage direct current from the rectifying circuit into high-voltage direct current according to a corresponding boost ratio according to the PWM control signal from the drive control circuit.

In a first possible implementation manner, with reference to the first aspect, the voltage boost circuit includes: the device comprises an inductor, an MOS (metal oxide semiconductor) tube, a first electrolytic capacitor, a first diode, a second diode, a first resistor, a second resistor and a third resistor;

the first end of the inductor is connected with the rectifying circuit, and the second end of the inductor is connected with the drain electrode of the MOS tube;

the anode of the first diode is connected with the drain electrode of the MOS tube, and the cathode of the first diode is connected with the anode of the first electrolytic capacitor;

the anode of the first electrolytic capacitor is connected with the self-adaptive feedback circuit, and the cathode of the first electrolytic capacitor is grounded;

the source electrode of the MOS tube is grounded, the grid electrode of the MOS tube is connected with the first end of the first resistor, and the second end of the first resistor is connected with the driving control circuit;

the first end of the second resistor is connected with the source electrode of the MOS tube, and the second end of the second resistor is connected with the grid electrode of the MOS tube;

the anode of the second diode is connected with the gate of the MOS transistor, the cathode of the second diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the second end of the first resistor.

In a second possible implementation manner, with reference to the first possible implementation manner, the voltage boost circuit further includes: the first capacitor, the second capacitor, the fourth resistor and the third diode;

the anode of the third diode is connected with the first end of the inductor, and the cathode of the third diode is connected with the cathode of the first diode;

the anode of the first capacitor is connected with the anode of the first diode, the cathode of the first capacitor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the cathode of the first diode;

the positive electrode of the second capacitor is connected with the second end of the inductor, and the negative electrode of the second capacitor is grounded.

In a third possible implementation manner, with reference to the first aspect, the driving control circuit includes: the circuit comprises a first control chip, a fifth resistor, a sixth resistor, a seventh resistor, a fourth diode, a third capacitor and a fourth capacitor;

the first end of the fifth resistor is connected with the rectifying circuit, and the second end of the fifth resistor is grounded;

a first end of the sixth resistor is connected with a first end of the fifth resistor, and a second end of the sixth resistor is connected with the first pin of the first control chip;

the anode of the fourth diode is grounded, and the cathode of the fourth diode is connected with the second end of the sixth resistor;

the anode of the third capacitor is connected with the second end of the sixth resistor, and the cathode of the third capacitor is grounded;

the anode of the fourth capacitor is connected with the second pin of the first control chip, and the cathode of the fourth capacitor is grounded;

a first end of the seventh resistor is connected with the third pin of the first control chip, and a second end of the seventh resistor is grounded;

and the first control chip is used for generating the PWM control signal according to the current flowing through the fifth resistor and the feedback signal from the self-adaptive feedback circuit and transmitting the PWM control signal to the booster circuit.

In a fourth possible implementation manner, with reference to the third possible implementation manner, the driving control circuit further includes: an eighth resistor, a fifth capacitor and a sixth capacitor;

the first end of the eighth resistor is connected with the fourth pin of the first control chip, the second end of the eighth resistor is connected with the anode of the fifth capacitor, and the cathode of the fifth capacitor is grounded;

and the anode of the sixth capacitor is connected with the fourth pin of the first control chip, and the cathode of the sixth capacitor is grounded.

In a fifth possible implementation manner, with reference to the first aspect and any one of the first possible implementation manner, the fifth possible implementation manner, the third possible implementation manner, and the fourth possible implementation manner of the first aspect, the adaptive feedback circuit includes: the circuit comprises a fifth diode, a sixth diode, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, an NPN type triode and a seventh diode;

the anode of the fifth diode is connected with the live wire of the alternating current;

the anode of the sixth diode is connected with a zero line of the alternating current, and the cathode of the sixth diode is connected with the cathode of the fifth diode;

a cathode of the fifth diode is connected with a first end of the ninth resistor, a second end of the ninth resistor is connected with a first end of the tenth resistor, a second end of the tenth resistor is connected with a first end of the eleventh resistor, and a second end of the eleventh resistor is connected with a base of the NPN-type triode;

an emitter of the NPN type triode is connected with a first end of the twelfth resistor, and a second end of the twelfth resistor is grounded;

a collector of the NPN type triode is connected with a first end of the thirteenth resistor, and a second end of the thirteenth resistor is connected with the boost circuit;

a first end of the fourteenth resistor is respectively connected with a first end of the thirteenth resistor and the driving control circuit, and a second end of the fourteenth resistor is grounded;

the anode of the seventh capacitor is connected with the first end of the fourteenth resistor, and the cathode of the seventh capacitor is grounded;

a first end of the fifteenth resistor is connected with a base electrode of the NPN type triode, a second end of the fifteenth resistor is connected with an anode of the seventh diode, and a cathode of the seventh diode is grounded.

In a sixth possible implementation manner, with reference to the fifth possible implementation manner, the adaptive feedback circuit further includes: a second electrolytic capacitor;

the anode of the second electrolytic capacitor is connected with the base electrode of the NPN type triode, and the cathode of the second electrolytic capacitor is grounded.

In a seventh possible implementation manner, with reference to the sixth possible implementation manner, the adaptive boost device further includes: an AC feedback circuit;

the alternating current feedback circuit is connected with the drive control circuit;

the alternating current feedback circuit is used for sending a closing signal to the drive control circuit when the voltage of the alternating current is smaller than a preset value;

the drive control circuit is further used for enabling the booster circuit to stop converting the low-voltage direct current into the high-voltage direct current according to the closing signal.

In an eighth possible implementation manner, with reference to the seventh possible implementation manner, the alternating current feedback circuit includes: the circuit comprises a second control chip, a direct-current power supply, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eighth diode, a ninth diode, an eighth capacitor and a ninth capacitor;

a first end of the sixteenth resistor is connected with a cathode of the sixth diode, a second end of the sixteenth resistor is connected with a first end of the seventeenth resistor, and a second end of the seventeenth resistor is grounded;

the anode of the eighth diode is grounded, and the cathode of the eighth diode is connected with the second end of the sixteenth resistor;

a first end of the eighth capacitor is grounded, and a second end of the eighth capacitor is connected with a second end of the sixteenth resistor;

a first end of the eighteenth resistor is connected with the direct-current power supply, a second end of the eighteenth resistor is connected with a negative electrode of the ninth diode, and a positive electrode of the ninth diode is grounded;

a first end of the nineteenth resistor is connected with a negative electrode of the ninth diode, and a second end of the nineteenth resistor is connected with the first pin of the second control chip;

a first end of the twentieth resistor is connected with a second end of the sixteenth resistor, and a second end of the twentieth resistor is connected with the second pin of the second control chip;

a first end of the twenty-first resistor is connected with a second end of the twentieth resistor, and the second end of the twenty-first resistor is respectively connected with a third pin of the second control chip and a collector of the NPN-type triode;

the positive electrode of the ninth capacitor is respectively connected with the direct-current power supply and the fourth pin of the second control chip, and the negative electrode of the ninth capacitor is grounded;

and the second control chip is used for sending the closing signal to the drive control circuit when the voltage of the first pin of the second control chip is greater than the voltage of the second pin of the second control chip.

In a second aspect, an embodiment of the present invention further provides an adaptive boosting method for an adaptive boosting apparatus, which is provided based on the first aspect or any possible implementation manner of the first aspect, and includes:

the self-adaptive feedback circuit is used for detecting the voltage of the alternating current input into the rectifying circuit and transmitting a corresponding feedback signal to the drive control circuit according to the magnitude of the voltage of the alternating current;

generating a corresponding PWM control signal by using the drive control circuit according to the feedback signal, and transmitting the PWM control signal to the booster circuit;

and converting the low-voltage direct current into high-voltage direct current according to the corresponding boosting ratio by using the boosting circuit according to the PWM control signal.

According to the technical scheme, the rectifying circuit can convert alternating current into low-voltage direct current, the self-adaptive feedback circuit detects the voltage of the alternating current input into the rectifying circuit and sends a corresponding feedback signal to the drive control circuit according to the detected voltage, the drive control circuit generates a corresponding PWM control signal according to the received feedback signal and sends the formed PWM control signal to the boosting circuit, and the boosting circuit converts the low-voltage direct current output by the rectifying circuit into high-voltage direct current according to the corresponding boosting ratio according to the received PWM control signal. Therefore, the self-adaptive feedback circuit can feed back a corresponding feedback signal according to the voltage of the input alternating current, the drive control circuit generates a corresponding PWM control signal according to the received feedback signal, and the booster circuit can convert the low-voltage direct current into the high-voltage direct current according to the PWM control signal and the optimal boosting ratio corresponding to the alternating current input voltage, so that the alternating current input can be continuously converted into the high-voltage direct current according to the voltage of the alternating current input and the optimal boosting ratio, and the conversion efficiency when the alternating current is converted into the high-voltage direct current is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an adaptive boost device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another adaptive boost device provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of another adaptive boosting apparatus according to an embodiment of the present invention;

fig. 4 is a flowchart of an adaptive boosting method according to an embodiment of the present invention.

Detailed Description

As described above, when converting ac power to high dc voltage, ac inputs having different voltages have different optimal step-up ratios, and the highest conversion efficiency is obtained when converting ac inputs to dc outputs based on the optimal step-up ratios. The conventional PFC boost circuit can only detect the output voltage but cannot detect the input voltage range, so that the boost ratio cannot be adjusted according to the input voltage range to adjust the output voltage range, and only the ac input can be converted into the dc output according to the output voltage with a single magnitude, that is, the ac input cannot be converted into the dc output according to the optimal boost ratio, which results in low conversion efficiency when the ac is converted into the high dc voltage.

In the embodiment of the present invention, the adaptive feedback circuit may detect a voltage of the alternating current input to the rectification circuit, and transmit a corresponding feedback signal to the driving control current according to the detected voltage, and then the driving control circuit may generate a corresponding PWM control signal according to the feedback signal, and transmit the generated PWM control signal to the voltage boost circuit, and the voltage boost circuit may convert the low-voltage direct current output by the rectification current into the high-voltage direct current according to a corresponding voltage boost ratio according to the PWM control signal from the driving control circuit. Therefore, the adaptive feedback circuit can detect the voltage of the alternating current input, and then the drive control circuit can generate the PWM control signal corresponding to the optimal boosting ratio according to the voltage of the alternating current input, so that the boosted voltage converts the low-voltage direct current into the high-voltage direct current according to the generated PWM control signal and the optimal boosting ratio, and the conversion efficiency of converting the alternating current into the high-voltage direct current is improved.

The following describes in detail an adaptive boost device and method according to an embodiment of the present invention with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention provides an adaptive boost device, including: a rectifying circuit 10, a booster circuit 20, a drive control circuit 30, and an adaptive feedback circuit 40;

the rectifying circuit 10 is connected to the booster circuit 20 and the drive control circuit 30, respectively;

the driving control circuit 30 is respectively connected with the booster circuit 20 and the adaptive feedback circuit 40;

a rectifying circuit 10 for converting an externally input ac power into a low-voltage dc power and transmitting the low-voltage dc power to a booster circuit 20;

an adaptive feedback circuit 40 for detecting the voltage of the alternating current input to the rectifying circuit and transmitting a corresponding feedback signal to the driving control circuit 30 according to the magnitude of the voltage of the alternating current;

the driving control circuit 30 is used for generating a corresponding PWM control signal according to the feedback signal from the adaptive feedback circuit 40 and transmitting the PWM control signal to the booster circuit 20;

the booster circuit 20 converts the low-voltage dc power from the rectifier circuit 10 into a high-voltage dc power at a corresponding boosting ratio based on the PWM control signal from the drive control circuit 30.

In the embodiment of the present invention, the rectifier circuit 10 may convert an alternating current into a low-voltage direct current, the adaptive feedback circuit 40 detects a voltage of the alternating current input to the rectifier circuit 10 and transmits a corresponding feedback signal to the drive control circuit 30 according to the detected voltage, the drive control circuit 30 generates a corresponding PWM control signal according to the received feedback signal and transmits the formed PWM control signal to the voltage boost circuit 20, and the voltage boost circuit 20 converts the low-voltage direct current output by the rectifier circuit 10 into a high-voltage direct current according to a corresponding voltage boost ratio according to the received PWM control signal. It can be seen that the adaptive feedback circuit 40 can feed back a corresponding feedback signal according to the voltage of the input ac power, the drive control circuit 30 can generate a corresponding PWM control signal according to the received feedback signal, and the boost circuit 20 can convert the low-voltage dc power into the high-voltage dc power according to the PWM control signal according to the optimal boost ratio corresponding to the ac input voltage, so that the ac input can be continuously converted into the high-voltage dc power according to the voltage of the ac input according to the optimal boost ratio, and the conversion efficiency when the ac is converted into the high-voltage dc power is ensured.

Optionally, on the basis of the adaptive boosting device shown in fig. 1, as shown in fig. 2, the boosting circuit 20 includes an inductor L, a MOS transistor V1, a first electrolytic capacitor CE1, a first diode VD1, a second diode VD2, a first resistor R1, a second resistor R2, and a third resistor R3;

a first end of the inductor L is connected with the rectifying circuit 10, and a second end of the inductor L is connected with the drain of the MOS transistor V1;

the anode of the first diode VD1 is connected with the drain of the MOS tube V1, and the cathode of the first diode VD1 is connected with the anode of the first electrolytic capacitor CE 1;

the anode of the first electrolytic capacitor CE1 is connected to the adaptive feedback circuit 40, and the cathode of the first electrolytic capacitor CE1 is grounded;

the source of the MOS transistor V1 is grounded, the gate of the MOS transistor V1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the driving control circuit 30;

a first end of the second resistor R2 is connected with the source electrode of the MOS transistor V1, and a second end of the second resistor R2 is connected with the gate electrode of the MOS transistor V1;

the anode of the second diode VD2 is connected to the gate of the MOS transistor V1, the cathode of the second diode VD2 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the second end of the first resistor R1.

In the embodiment of the invention, the rectifying circuit 10 comprises a rectifying bridge stack DB, after the alternating current is input into the rectifying bridge stack DB by the alternating current input L N, the rectifying bridge stack DB converts the alternating current input into the low direct current voltage DC-a, the low direct current voltage DC-a is connected to the inductor L, because the MOS transistor V1 is continuously switched on and off under the control of the driving control circuit 30, the low direct current voltage DC-a is converted into the high frequency square wave voltage AC-a, the high frequency square wave voltage AC-a is rectified into the high voltage direct current voltage when being connected to the first diode VD1, and the high voltage direct current voltage is filtered into the stable high voltage direct current DC-B by the first electrolytic capacitor CE 1.

In the embodiment of the invention, the first resistor R1, the second resistor R2, the third resistor R3 and the second diode (fast recovery diode) VD2 constitute a current limiting circuit, which is used for effectively transmitting the PWM control signal from the driving control circuit to the MOS transistor V1 to control the MOS transistor V1 to operate in order.

In an embodiment of the present invention, the first electrolytic capacitor CE1 may be an aluminum electrolytic capacitor.

In the embodiment of the invention, the high-voltage direct current DC-B is the high-voltage direct current voltage which is finally converted, and further the high-voltage direct current DC-B can be transmitted to a variable frequency compressor of a household air conditioner, a high-power freezer, high-power refrigeration equipment and the like.

Optionally, on the basis that the boosting circuit 20 of the above embodiment includes the inductor L, the first electrolytic capacitor CE1, the first diode VD1, the second diode VD2, the first resistor R1, the second resistor R2 and the third resistor R3, as shown in fig. 2, the boosting voltage 20 further includes a first capacitor C1, a second capacitor C2, a fourth resistor R4 and a third diode VD 3;

the anode of the third diode VD3 is connected to the first end of the inductor L, and the cathode of the third diode VD3 is connected to the cathode of the first diode VD 1;

the anode of the first capacitor C1 is connected with the anode of the first diode VD1, the cathode of the first capacitor C1 is connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected with the cathode of the first diode VD 1;

the positive terminal of the second capacitor C2 is connected to the second terminal of the inductor L, and the negative terminal of the second capacitor C2 is grounded.

In the embodiment of the present invention, the third diode VD3 is a clamping diode, and is used for protecting the inductor L and the MOS transistor v1, the second capacitor C2 is an absorption capacitor, and is used for protecting the MOS transistor v1, and the first capacitor C1 and the fourth resistor R4 form an RC absorption circuit, and are used for protecting the first diode (fast recovery rectifier diode) VD 1.

Alternatively, on the basis of the adaptive boosting apparatus shown in fig. 1, as shown in fig. 2, the drive control circuit 30 includes: the circuit comprises a first control chip U1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth diode VD4, a third capacitor C3 and a fourth capacitor C4;

a first end of the fifth resistor R5 is connected to the rectifier circuit 10, and a second end of the fifth resistor R5 is grounded;

a first end of the sixth resistor R6 is connected to a first end of the fifth resistor R5, and a second end of the sixth resistor R6 is connected to the first pin ISEN of the first control chip U1;

the anode of the fourth diode VD4 is grounded, and the cathode of the fourth diode VD4 is connected to the second end of the sixth resistor R6;

the anode of the third capacitor C3 is connected to the second end of the sixth resistor R6, and the cathode of the third capacitor C3 is grounded;

the anode of the fourth capacitor C4 is connected to the second pin ICOMP of the first control chip U1, and the cathode of the fourth capacitor C4 is grounded;

a first end of the seventh resistor R7 is connected to the FREQ pin of the first control chip U1, and a second end of the seventh resistor R7 is grounded;

and the first control chip U1 is configured to generate a PWM control signal according to the current flowing through the fifth resistor R5 and the feedback signal from the adaptive feedback circuit 40, and transmit the PWM control signal to the voltage boost circuit 20.

In the embodiment of the invention, when the transformation voltage of the alternating current input L N is changed, the current of the fifth resistor R5 can be changed, the first control chip U1 controls the current power of the booster circuit 20 by monitoring the current of the fifth resistor R5, the seventh resistor R7 is an auxiliary resistor, the difference of the resistance value of the seventh resistor R7 can control the PWM carrier frequency of the first control chip U1 to be correspondingly changed, and when the resistance value of the seventh resistor R7 is changed within the range of 8.5K Ω -130K Ω, the PWM carrier frequency of the first control chip U1 is correspondingly changed within the range of 18KHz-250 KHz.

In the embodiment of the present invention, the first controller chip U1 may be a controller chip of UCC 2818D.

Alternatively, on the basis that the drive control circuit 30 of the above-described embodiment includes the first control chip U1, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the fourth diode VD4, the third capacitor C3 and the fourth capacitor C4, as shown in fig. 2, the drive control circuit 30 may further include: an eighth resistor R8, a fifth capacitor C5 and a sixth capacitor C6;

a first end of the eighth resistor R8 is connected to the fourth pin VCOMP of the first control chip U1, a second end of the eighth resistor R8 is connected to the anode of the fifth capacitor C5, and the cathode of the fifth capacitor C5 is grounded;

the positive electrode of the sixth capacitor C6 is connected to the fourth pin VCOMP of the first controller chip U1, and the negative electrode of the sixth capacitor C6 is grounded.

In the embodiment of the invention, the eighth resistor R8, the fifth capacitor C5 and the sixth capacitor C6 form a voltage compensation circuit, so that the first control chip U1 can output a more stable PWM control signal, thereby stabilizing the output voltage of the voltage boost circuit 20.

Alternatively, on the basis of the adaptive boost device provided in the foregoing embodiments, as shown in fig. 2, the adaptive feedback circuit 40 includes: a fifth diode VD5, a sixth diode VD6, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a seventh capacitor C7, an NPN-type triode Q1, and a seventh diode VD 7;

the anode of the fifth diode VD5 is connected to the hot line L of alternating current;

the anode of the sixth diode VD6 is connected to the zero line N of the alternating current, and the cathode of the sixth diode VD6 is connected to the cathode of the fifth diode VD 5;

a cathode of the fifth diode VD5 is connected to a first end of a ninth resistor R9, a second end of the ninth resistor R9 is connected to a first end of a tenth resistor R10, a second end of the tenth resistor R10 is connected to a first end of an eleventh resistor R11, and a second end of the eleventh resistor R11 is connected to a base of an NPN transistor Q1;

an emitter of the NPN type triode Q1 is connected to a first end of the twelfth resistor R12, and a second end of the twelfth resistor R12 is grounded;

a collector of the NPN transistor Q1 is connected to a first terminal of a thirteenth resistor R13, and a second terminal of the thirteenth resistor R13 is connected to the boost circuit 20;

a first end of the fourteenth resistor R14 is connected to the first end of the thirteenth resistor R13 and the driving control circuit 30, respectively, and a second end of the fourteenth resistor R14 is grounded;

the anode of the seventh capacitor C7 is connected to the first end of the fourteenth resistor R14, and the cathode of the seventh capacitor C7 is grounded;

a first end of the fifteenth resistor R15 is connected to the base of the NPN transistor Q1, a second end of the fifteenth resistor R15 is connected to the anode of the seventh diode VD7, and the cathode of the seventh diode VD7 is grounded.

In the embodiment of the present invention, ac voltages with different levels are input to the ac input L N and rectified by the fifth diode VD5 and the sixth diode VD6 to form a high-voltage dc signal, the formed high-voltage dc signal is divided by the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the fifteenth resistor R15 to obtain a low-voltage signal, the low-voltage signal passes through the base of the NPN transistor Q1 to make the NPN transistor Q1 operate in the amplification region of the amplification transistor, and then the low-voltage signal is matched with a voltage dividing resistor circuit formed by the twelfth resistor R12, the thirteenth resistor R13, and the fourteenth resistor R14 to make the voltages VF different in level, and then filtered by the seventh capacitor C7 and fed back to the driving control circuit 30 (the first control chip U1), and the driving control circuit 30 (the first control chip U1) controls the PWM control signal according to the difference of the feedback signal, so that the boost circuit 20 outputs different high-voltage dc voltages.

In the embodiment of the present invention, the seventh diode VD7 is used to include an NPN transistor Q1 to prevent the NPN transistor Q1 from conducting in the reverse direction and failing.

In the embodiment of the present invention, when the voltage of the ac input L N is increased, the voltage across the fifteenth resistor R5 is increased, and at this time, the voltage across the fifteenth resistor R15 is applied to the base of the NPN transistor Q1, so that the resistance of the NPN transistor Q1 is decreased, and the voltage input to the VSEN pin of the first control chip U1 is decreased, at this time, the first control chip U1 increases the duty ratio of the output PWM control signal, so as to increase the high DC voltage DC-B output by the voltage boost circuit 20, and ensure the conversion efficiency when the ac input is converted into the high DC voltage.

Optionally, on the basis that the adaptive feedback circuit 40 in the adaptive boost device provided in the above-mentioned embodiment includes the fifth diode VD5, the sixth diode VD6, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the seventh capacitor C7, the NPN-type triode Q1, and the seventh diode VD7, as shown in fig. 2, the adaptive feedback circuit 40 may further include: a second electrolytic capacitor CE 2;

the anode of the second electrolytic capacitor CE2 is connected to the base of the NPN transistor Q1, and the cathode of the second electrolytic capacitor CE2 is grounded.

In the embodiment of the present invention, the second electrolytic capacitor CE2 is used for filtering to stabilize the low voltage signal inputted to the base of the NPN transistor Q1.

Optionally, on the basis of the adaptive boost device shown in fig. 1, as shown in fig. 3, the adaptive boost device further includes: an alternating current feedback circuit 50;

the alternating current feedback circuit 50 is connected with the drive control circuit 30;

an ac feedback circuit 50 for sending a shutdown signal to the drive control circuit 30 when the voltage of the ac power is less than a preset value;

the driving control circuit 30 is further configured to stop the step-up circuit 20 from converting the low-voltage dc power into the high-voltage dc power according to the shutdown signal.

In the embodiment of the present invention, when the voltage of the ac input is too small, if the ac input with a lower voltage is forced to be converted into a high dc voltage by the voltage boost circuit 20, the MOS transistor V1 in the voltage boost circuit 20 may be damaged. By arranging the ac feedback circuit 50, the ac feedback circuit 50 can collect the voltage of the ac input and feed the voltage back to the driving control circuit 30, and when the voltage of the ac input is smaller than a preset value, the driving control circuit 30 controls the voltage boost circuit 20 to stop converting the low-voltage dc into the high-voltage dc, so that the MOS transistor V1 in the voltage boost circuit 20 can be protected.

Alternatively, on the basis of the adaptive boosting apparatus shown in fig. 3, as shown in fig. 2, the ac feedback circuit 50 includes: the controller comprises a second control chip U2, a direct-current power supply VCC, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, an eighth diode VD8, a ninth diode VD9, an eighth capacitor C8 and a ninth capacitor C9;

a first end of the sixteenth resistor R16 is connected to the cathode of the sixth diode VD6, a second end of the sixteenth resistor R16 is connected to a first end of the seventeenth resistor R17, and a second end of the seventeenth resistor R17 is grounded;

the anode of the eighth diode VD8 is grounded, and the cathode of the eighth diode VD8 is connected to the second end of the sixteenth resistor R16;

a first end of the eighth capacitor C8 is grounded, and a second end of the eighth capacitor C8 is connected to a second end of the sixteenth resistor R16;

a first end of the eighteenth resistor R18 is connected with the direct-current power supply VCC, a second end of the eighteenth resistor R18 is connected with the negative electrode of the ninth diode VD9, and the positive electrode of the ninth diode VD9 is grounded;

a first end of the nineteenth resistor R19 is connected with a cathode of the ninth diode VD9, and a second end of the nineteenth resistor R19 is connected with the first pin-I1 of the second control chip U2;

a first end of the twentieth resistor R20 is connected with a second end of the sixteenth resistor R16, and a second end of the twentieth resistor R20 is connected with the second pin + I1 of the second control chip U2;

a first end of the twenty-first resistor R21 is connected with a second end of the twentieth resistor R20, and a second end of the twenty-first resistor R21 is connected with a third pin O1 of the second control chip U2 and a collector of the NPN transistor Q1;

the anode of the ninth capacitor C9 is connected to the dc power VCC and the fourth pin VCC of the second control chip U2, respectively, and the cathode of the ninth capacitor C9 is grounded;

and the second control chip U2 is used for sending a closing signal to the drive control circuit 30 when the voltage of the first pin I1 is greater than the voltage of the second pin + I1.

In the embodiment of the invention, alternating current input voltage signals with different heights are rectified by a fifth diode VD5 and a sixth diode VD6 to form high-voltage direct current signals, the formed high-voltage direct current signals are transmitted to a second control chip U2 by a voltage division circuit composed of a sixteenth resistor R16, a seventeenth resistor R17, a twentieth resistor R20, an eighth capacitor C8 and an eighth diode VD8, and meanwhile, a reference voltage signal is transmitted to the second control chip U2 by a reference circuit composed of an eighteenth resistor R18, a nineteenth resistor R19 and a ninth diode VD 9. The second control chip U2 monitors the ac input voltage signal in real time and for the reference voltage signal, when the ac input voltage signal is less than the reference voltage signal, the second control chip U2 outputs a low level to change the collector (VF) of the NPN transistor Q1 to a low level, and when the first control chip U1 monitors that the pin VSEN is a low level, the output PWM control signal is immediately controlled to turn off the boost circuit 20, thereby protecting the entire adaptive boost device. When the ac input voltage signal is greater than the reference voltage signal, the second control chip U2 outputs a high level, and at this time, the voltage at VF is not controlled by the second control chip U2, and the voltage at VF is controlled by the adaptive feedback circuit 40 only.

In the embodiment of the present invention, the second control chip U2 may be a control chip with model number L M2903.

It should be noted that, according to the adaptive boost device shown in fig. 2, the adaptive boost device has at least the following beneficial effects:

1. the boost circuit has a wide range. The voltage boosting can be realized according to the range of the practical application condition 90Vac-270Vac, the frequency is adjustable, and the PFC switching frequency can be adjusted at any time according to the requirements of different types of equipment, so that the development period of equipment products is shortened.

2. The high-frequency PFC booster circuit is formed by taking a UCC28180D driving control chip of TI company as a core and referring to a BOOST framework, the working frequency of the high-frequency PFC booster circuit can reach 250KHz, so that the inductance of the PFC booster circuit is reduced, the volume is greatly reduced, and then the circuit integrates a voltage feedback circuit and a current feedback circuit without an independent additional current feedback circuit. Thereby realizing the miniaturization of the whole machine of a household air conditioner, a high-power freezer, high-power refrigeration equipment and the like.

3. The AC feedback circuit with L M2903 comparator as core features that it can self-test if there is AC input and feed back it to UCC28180D to drive control chip, so preventing the false action from exploding.

4. The self-adaptive feedback circuit is characterized in that an AC voltage value is detected and fed back to a UCC28180D driving control chip, a certain boost ratio (between 1.5 and 3.0 and adjusted according to actual product efficiency) is ensured, and accordingly, the output voltage of the PFC can be changed along with the change of the input AC voltage value, and the high efficiency of the PFC boost circuit is ensured.

It is to be understood that the illustrated structure of the embodiment of the present invention does not specifically limit the adaptive boost device. In other embodiments of the invention, the adaptive boost device may include more or fewer components than shown, or combine certain components, or split certain components, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

As shown in fig. 4, an embodiment of the present invention provides an adaptive boosting method based on the adaptive boosting apparatus provided in any one of the above embodiments, where the adaptive boosting method may include the following steps:

step 401: converting externally input alternating current into low-voltage direct current by using a rectifying circuit, and transmitting the low-voltage direct current to a booster circuit;

step 402: the voltage of the alternating current input into the rectifying circuit is detected by using the self-adaptive feedback circuit, and a corresponding feedback signal is transmitted to the drive control circuit according to the voltage of the alternating current;

step 403: generating a corresponding PWM control signal by using the drive control circuit according to the feedback signal, and transmitting the PWM control signal to the booster circuit;

step 404: and converting the low-voltage direct current into the high-voltage direct current according to the corresponding boosting ratio by using the boosting circuit according to the PWM control signal.

In the embodiment of the present invention, the adaptive feedback circuit is used to detect the voltage of the ac input, and transmit the corresponding feedback signal to the driving control circuit according to the voltage of the ac input, and then the driving control circuit may be used to generate the corresponding PWM control signal according to the feedback signal to control the boost circuit, so that the boost circuit converts the ac input into the high dc voltage according to the optimal boost ratio corresponding to the ac input voltage, and thus the boost ratio may be adjusted adaptively according to the voltage of the ac input in the process of converting the ac input into the high dc voltage, and the ac input is continuously converted into the high dc voltage according to the optimal boost ratio, thereby ensuring the conversion efficiency when converting the ac into the high dc voltage.

It should be noted that the adaptive boosting method provided in the embodiments of the present invention is implemented based on the adaptive boosting device provided in each of the embodiments, and the adaptive boosting method and the adaptive boosting device are implemented based on the same inventive concept, and specific boosting methods can be referred to the description of the adaptive boosting device in each of the embodiments, and are not described herein again.

It should be noted that not all steps and modules in the above flows and system structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The system structure described in the above embodiments may be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by a plurality of physical entities, or some components in a plurality of independent devices may be implemented together.

In the above embodiments, the hardware module may be implemented mechanically or electrically. For example, a hardware module may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. A hardware module may also include programmable logic or circuitry (e.g., a general-purpose processor or other programmable processor) that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.

While the invention has been shown and described in detail in the drawings and in the preferred embodiments, it is not intended to limit the invention to the embodiments disclosed, and it will be apparent to those skilled in the art that various combinations of the code auditing means in the various embodiments described above may be used to obtain further embodiments of the invention, which are also within the scope of the invention.

Claims

1. An adaptive boosting device, comprising: the self-adaptive feedback circuit comprises a rectifying circuit, a booster circuit, a drive control circuit and a self-adaptive feedback circuit;

2. The apparatus of claim 1, wherein the boost circuit comprises: the device comprises an inductor, an MOS (metal oxide semiconductor) tube, a first electrolytic capacitor, a first diode, a second diode, a first resistor, a second resistor and a third resistor;

3. The apparatus of claim 2, wherein the boost circuit further comprises: the first capacitor, the second capacitor, the fourth resistor and the third diode;

4. The apparatus of claim 1, wherein the drive control circuit comprises: the circuit comprises a first control chip, a fifth resistor, a sixth resistor, a seventh resistor, a fourth diode, a third capacitor and a fourth capacitor;

5. The apparatus of claim 4, wherein the drive control circuit further comprises: an eighth resistor, a fifth capacitor and a sixth capacitor;

6. The apparatus of any of claims 1-5, wherein the adaptive feedback circuit comprises: the circuit comprises a fifth diode, a sixth diode, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, an NPN type triode and a seventh diode;

7. The apparatus of claim 6, wherein the adaptive feedback circuit further comprises: a second electrolytic capacitor;

8. The apparatus of claim 7, further comprising: an AC feedback circuit;

9. The apparatus of claim 8, wherein the ac feedback circuit comprises: the circuit comprises a second control chip, a direct-current power supply, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eighth diode, a ninth diode, an eighth capacitor and a ninth capacitor;

10. An adaptive boosting method according to any one of claims 1 to 9, comprising: