CN215734032U

CN215734032U - Boost circuit driven by PFC (power factor correction) controller

Info

Publication number: CN215734032U
Application number: CN202121891870.4U
Authority: CN
Inventors: 王镇; 邢军
Original assignee: Shenzhen Impower Technology Co ltd
Current assignee: Shenzhen Impower Technology Co ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-02-01
Anticipated expiration: 2031-08-12

Abstract

The utility model discloses a boost circuit driven by a PFC (power factor correction) controller, which comprises a rectifying module, a control module, a driving module and a boost module, wherein the rectifying module is connected with the boost module; the boosting module comprises a first boosting circuit and a second boosting circuit, the first boosting circuit and the second boosting circuit are respectively connected with the driving module, and the output end of the first boosting circuit is connected with the output end of the second boosting circuit. The control module controls the driving module to drive the boosting module, the output ends of the two paths of boosting circuits of the boosting module are connected in parallel, and the two paths of boosting circuits have a phase difference of 180 degrees under the regulation and control of the control module, so that the boosting module can alternately work, the transmission efficiency is greatly improved, and the loss is reduced. Because the voltage is boosted by two paths, the current of each group of booster circuit can be reduced, and the capacity of components can be reduced, so that the size of the components is reduced, the sectional materials are saved, and the production cost is reduced.

Description

Boost circuit driven by PFC (power factor correction) controller

Technical Field

The utility model relates to the technical field of power electronic application, in particular to a boost circuit driven by a PFC (power factor correction) controller.

Background

With the rapid development of power electronics, the performance of a switching power supply is also continuously improved, the switching power supply is a capacitance input type circuit, the phase difference between the current and the voltage of the switching power supply can cause the loss of exchange power, and in order to effectively improve the quality of the power supply, a Power Factor Correction (PFC) technology is often used in power electronics equipment, so that the natural turn-off of a zero-crossing point of a diode and the zero-current turn-on of a switching tube can be realized. In the existing PFC circuit, in order to meet the requirement of large current, the adopted elements such as an inductor and the like are often large in size, so that the whole size of the equipment is large, the circuit loss is high, the cost of sectional materials is high, and the production cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a boost circuit driven by a PFC controller, which can solve the problems of high equipment material consumption, high circuit loss and high production cost caused by the overlarge element size in the conventional PFC circuit.

In order to achieve the purpose, the technical scheme provided by the utility model is as follows: a boost circuit driven by a PFC controller comprises a rectifying module, a control module, a driving module and a boost module, wherein the rectifying module is connected with the boost module; the boosting module comprises a first boosting circuit and a second boosting circuit, the first boosting circuit and the second boosting circuit are respectively connected with the driving module, and the output end of the first boosting circuit is connected with the output end of the second boosting circuit.

In the boost circuit driven by the PFC controller according to the present invention, the first boost circuit includes an inductor L1A, a diode V3, and a switching tube V13, one end of the inductor L1A is connected to the rectifier module, and the other end of the inductor L1A is connected to an anode of a diode V3 and a drain of the switching tube V13, respectively;

the second boost circuit comprises an inductor L2A, a diode V4 and a switch tube V8, wherein one end of the inductor L2A is connected with the rectifying module, the other end of the inductor L2A is respectively connected with the anode of a diode V4 and the drain of a switch tube V8, the cathode of a diode V3 is connected with the cathode of the diode V4, and the source of a switch tube V13 is connected with the source of the switch tube V8 and grounded.

In the boost circuit driven by the PFC controller according to the present invention, the rectifier module includes a first rectifier bridge B1 and a second rectifier bridge B2, an ac input terminal of the first rectifier bridge B1 is connected to a live line L of an ac power supply, an ac input terminal of the second rectifier bridge B2 is connected to a neutral line N of the ac power supply, and a negative output terminal of the first rectifier bridge B1 is connected to a positive output terminal of the second rectifier bridge B2.

In the boost circuit driven by the PFC controller according to the present invention, the control module includes a PFC control chip, and an ac input voltage detection circuit, an ac output dc voltage detection circuit, an overvoltage detection circuit, a voltage compensation loop, and an inductive current zero crossing detection circuit connected to the PFC control chip, the ac input voltage detection circuit is connected to an input terminal of the boost module, and the ac output dc voltage detection circuit and the overvoltage detection circuit are both connected to an output terminal of the boost module.

In the boost circuit driven by the PFC controller according to the present invention, the PFC control chip is a UCC28063 chip.

In the boost circuit driven by the PFC controller of the present invention, the driving module includes a first driving module and a second driving module, and both the first driving module and the second driving module include a signal amplifying unit, a filtering unit, and a conducting unit;

the signal amplification unit comprises an N-type triode and a P-type triode, the base of the N-type triode is connected with the base of the P-type triode, the emitting electrode of the N-type triode is connected with the emitting electrode of the P-type triode, the collecting electrode of the N-type triode is connected with the filtering unit, the collecting electrode of the P-type triode is grounded, and the conduction unit is connected between the emitting electrode of the N-type triode and the emitting electrode of the P-type triode.

In the boost circuit driven by the PFC controller according to the present invention, the boost circuit further includes a slow start module, the slow start module includes a resistor R27, a relay K1, and a resistor R14 and a resistor R15 connected in series, the resistor R14 is connected to the first end of the relay, the resistor R15 is connected to the second end of the relay, and the resistor R27 is connected to the third end of the relay.

In the boost circuit driven by the PFC controller of the present invention, the boost circuit further includes a current sampling module, the current sampling module includes a plurality of sampling resistors connected in parallel, one end of each of the plurality of sampling resistors is connected to the negative output terminal of the rectifier module, and the other end of each of the plurality of sampling resistors is connected to the control module.

In the boost circuit driven by the PFC controller according to the present invention, the boost circuit further includes a filter module, one end of the filter module is connected to the positive output end of the rectifier module, the other end of the filter module is connected to the negative output end of the rectifier module, and the filter module includes a capacitor C5 and a capacitor C6 connected in parallel.

In the boost circuit driven by the PFC controller according to the present invention, the boost module further includes a plurality of capacitors connected in parallel, the plurality of capacitors are used for energy storage and filtering, one end of each of the plurality of capacitors is connected to a cathode of the diode V4, and the other end of each of the plurality of capacitors is grounded.

Through the technical scheme, the utility model has the beneficial effects that: the driving module is controlled by the control module, so that the driving module drives the boosting module, the boosting module comprises two paths of boosting circuits, the output ends of the two paths of boosting circuits are connected in parallel, the phase difference of the two paths of boosting circuits is 180 degrees under the regulation and control of the control module, the two paths of boosting circuits can alternately work, the continuous and stable output of voltage is guaranteed, the transmission efficiency is greatly improved, and the loss is reduced. Because the voltage is boosted by two paths, the current of each group of booster circuit can be reduced, so that the capacity of components can be reduced, the size of the components is reduced, the sectional materials are greatly saved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a boost module of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a control module of an embodiment of the present invention;

FIG. 3 is a schematic diagram of a drive module of an embodiment of the present invention;

fig. 4 is a schematic diagram of module connection according to an embodiment of the present invention.

100. A rectification module; 200. a control module; 210. an input voltage detection circuit; 220. an alternating current output direct current voltage detection circuit; 230. an overvoltage detection circuit; 240. a voltage compensation loop; 250. an inductive current zero-crossing detection circuit; 300. a drive module; 310. a first driving module; 320. a second driving module; 400. a boost module; 500. a slow start module; 600. a filtering module; 700. and a current sampling module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the boost circuit driven by the PFC controller according to the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 4, a boost circuit driven by a PFC controller includes a rectifying module 100, a control module 200, a driving module 300, and a boost module 400, wherein the rectifying module 100 is connected to the boost module 400, the control module 200 is connected to the driving module 300, and the driving module 300 is connected to the boost module 400; the boosting module 400 includes a first boosting circuit and a second boosting circuit, the first boosting circuit and the second boosting circuit are respectively connected with the driving module 300, and an output end of the first boosting circuit is connected with an output end of the second boosting circuit. According to the utility model, the control module 200 controls the driving module 300, so that the driving module 300 drives the boosting module 400, the boosting module 400 comprises two boosting circuits, the output ends of the two boosting circuits are connected in parallel, the phase difference of the two boosting circuits is 180 degrees under the regulation and control of the control module 200, the two boosting circuits can alternately work, the continuous and stable output of voltage is ensured, the transmission efficiency is greatly improved, and the loss is reduced. Because the voltage is boosted by two paths, the current of each group of booster circuit can be reduced, so that the capacity of components can be reduced, the size of the components is reduced, the sectional materials are greatly saved, and the production cost is reduced.

Referring to fig. 1, in the present embodiment, the first boost circuit includes an inductor L1A, a diode V3, and a switch V13, one end of the inductor L1A is connected to the rectifier module 100, and the other end of the inductor L1A is connected to an anode of a diode V3 and a drain of a switch V13, respectively;

the second boost circuit comprises an inductor L2A, a diode V4 and a switch tube V8, wherein one end of the inductor L2A is connected with the rectifier module 100, the other end of the inductor L2A is respectively connected with the anode of a diode V4 and the drain of a switch tube V8, the cathode of a diode V3 is connected with the cathode of the diode V4, and the source of a switch tube V13 is connected with the source of the switch tube V8 and grounded. Preferably, the diode V3 is connected in parallel with a diode V1, the switch tube V13 is connected in parallel with a switch tube V12, the diode V4 is connected in parallel with a diode V5, and the switch tube V8 is connected in parallel with a switch tube V9, so that a larger current can pass through.

In the first boost circuit, when the switching tubes V13 and V12 are turned on, the inductor L1A is short-circuited, and at this time, the voltage is applied to the inductor L1A, and when the switching tubes V13 and V12 are turned off, the input voltage and the inductor L1A discharge to the load through the diode V3 and the diode V1, and the two are superimposed, so that boost is realized. The principle of the second boost circuit is identical to that of the first boost circuit. The phase difference between the first booster circuit and the second booster circuit is 180 degrees, and the switching tube V8, the switching tube V9, the switching tube V13 and the switching tube V12 work alternately, so that the loss is greatly reduced, and the efficiency is improved.

Referring to fig. 1, in the present embodiment, the rectifier module 100 includes a first rectifier bridge B1 and a second rectifier bridge B2, an ac input terminal of the first rectifier bridge B1 is connected to a live line L of an ac power source, an ac input terminal of the second rectifier bridge B2 is connected to a neutral line N of the ac power source, and a negative output terminal of the first rectifier bridge B1 is connected to a positive output terminal of the second rectifier bridge B2. The two bridge rectifiers are used in parallel, so that the rectified output current can be increased, and the power is increased.

Referring to fig. 2, in the present embodiment, the control module 200 includes a PFC control chip, and an ac input voltage detection circuit 210, an ac output dc voltage detection circuit 220, an overvoltage detection circuit 230, a voltage compensation loop 240 and an inductive current zero crossing point detection circuit 250 connected to the PFC control chip, wherein the ac input voltage detection circuit 210 is connected to an input end of the boost module 400, and the ac output dc voltage detection circuit 220 and the overvoltage detection circuit 230 are both connected to an output end of the boost module 400.

The alternating-current input voltage detection circuit 210 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R47 and a capacitor C18, wherein the resistor R1, the resistor R2 and the resistor R3 are connected in series, the resistor R3 is connected with a VINAC pin of a PFC chip, a resistor R1 is connected with an anode output end of the rectification module 100, and the resistor R47 and the capacitor C18 are connected in parallel to form a resistor-capacitor circuit, so that voltage reduction and current limitation can be performed, and the chip is prevented from being circulated due to overlarge voltage.

The alternating current output direct current voltage detection circuit 220 comprises a resistor R4, a resistor R5, a resistor R6, a resistor R48 and a capacitor C19, wherein the resistor R4, the resistor R5 and the resistor R6 are connected in series, the resistor R4 is connected with a VSENSE pin of a PFC chip, a resistor R6 is connected with the anode output end of the boosting module, and the resistor R48 and the capacitor C19 are connected in parallel to form a resistance-capacitance circuit.

The overvoltage detection circuit 230 comprises a resistor R7, a resistor R8, a resistor R9, a resistor R49 and a resistor C20, wherein the resistor R7, the resistor R8 and the resistor R9 are connected in series, the resistor R7 is connected with the anode output end of the boost module 400, the resistor R9 is connected with the HVSEN of the PFC chip, and the resistor R49 and the resistor C20 form a resistor-capacitor circuit, so that the chip can be prevented from being damaged in overvoltage.

The voltage compensation loop 240 comprises a capacitor C15, a capacitor C16 and a resistor R46, wherein the capacitor C15 is connected in series with the resistor R46, and the capacitor C16 is connected in parallel with the capacitor C5 and the capacitor C46 which are connected in series, so that the function of adjusting the control voltage can be achieved.

The inductive current zero crossing point detection circuit 250 comprises a resistor R40, a resistor R41, a capacitor C14 and a capacitor C17, wherein two ends of the resistor R40 are connected with a ZCDB pin of the PFC chip, one end of the capacitor C14 is grounded, and the other end of the capacitor C14 is connected with a resistor R40; two ends of the resistor R41 are connected with a ZCDA pin of the PFC chip, one end of the capacitor C17 is grounded, the other end of the capacitor C17 is connected with the resistor R41, and the output power of the circuit can be adjusted.

In the embodiment, the PFC control chip is a UCC28063 chip, and the UCC28063 chip can provide a fast response with high matching degree and ensure that each channel operates in the conversion mode. The device has extended system level protection including input undervoltage and voltage drop recovery, output overvoltage, open loop, overload, soft start, phase fault detection and thermal shutdown protection. Additional fail-safe over-voltage protection (OVP) features may prevent intermediate voltage shorts from occurring, which may lead to catastrophic device failure if such shorts are not successfully detected. The chip has high-level nonlinear gain, can provide quick and smoother response to line and load transient events, has small bias current and improves standby power efficiency. The chip also has special line drop handling characteristics that prevent significant current interruption and minimize audible noise generation.

Referring to fig. 3, in the present embodiment, the driving module 310 includes a first driving module 310 and a second driving module 320, and the first driving module 310 and the second driving module 320 both include a signal amplifying unit, a filtering unit and a conducting unit;

In the first driving module 310, a signal amplifying unit amplifies signals through a resistor R21, a resistor R28, a triode V6 and a triode V10, the resistor R21 is connected with a resistor R28 in series, a resistor R21 is connected with bases of the triode V6 and the triode V10, and a resistor R28 is connected with an HVSEN pin of a UCC28063 chip; the conducting unit comprises a resistor R23, a resistor R17 and a diode V14, the resistor R17 is connected with the cathode of the diode V14, one end of a resistor R23 is connected with a resistor R17, the other end of the resistor R23 is connected with the anode of the diode V14, and the resistor R23, the resistor R17 and the diode V14 determine the time from closing to conducting of the switch tube; the filtering unit comprises a resistor R12 and a capacitor C3, the resistor R12 and the capacitor C3 form RC filtering, and the capacitor C3 filters the VCC end.

The second driving module 320 is shown in the figure, and its principle is the same as that of the first driving module 310, and will not be described in detail here.

Referring to fig. 1, in the present embodiment, the soft start module 500 is further included, the soft start module 500 includes a resistor R27, a relay K1, and a resistor R14 and a resistor R15 connected in series, the resistor R14 is connected to a first end of the relay, the resistor R15 is connected to a second end of the relay, and the resistor R27 is connected to a third end of the relay. The current firstly passes through the starting resistor R14 and the resistor R15, after the working state is normal, the relay K1 is attracted, the resistor R27 is a coil current-limiting resistor of the relay K1, and the slow starting module 500 can prevent the damage of components caused by overlarge impact of input voltage.

Referring to fig. 1, in the present embodiment, the current sampling module 700 further includes a plurality of sampling resistors connected in parallel, one end of each of the plurality of sampling resistors is connected to the negative output terminal of the rectifier module 100, and the other end of each of the plurality of sampling resistors is connected to the control module 200. The sampling resistors comprise resistors R36, resistors R37, resistors R38 and resistors R39, RC filtering is further connected between the sampling resistors and the control module, the RC filtering comprises resistors R44 and capacitors R22, and CS pins of the UCC28063 chip are connected between the resistors R44 and the capacitors R22. The current sampling module can play a role in protection, and once the output current is overlarge, the current can be limited or the voltage output can be cut off through the feedback of the current sampling module.

Referring to fig. 1, in the present embodiment, the dc voltage rectifying circuit further includes a filtering module 600, one end of the filtering module 600 is connected to the positive output end of the rectifying module 100, the other end of the filtering module 600 is connected to the negative output end of the rectifying module 100, and the filtering module 600 includes a capacitor C5 and a capacitor C6 connected in parallel, and filters the rectified dc voltage, so as to remove ripples and smooth the output dc voltage.

Referring to fig. 1, in the present embodiment, the boost module 400 further includes a plurality of capacitors connected in parallel, the plurality of capacitors are used for energy storage and filtering, one end of each of the plurality of capacitors is connected to the cathode of the diode V4, and the other end of each of the plurality of capacitors is grounded. As shown in the figure, the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C10, the capacitor C11, the capacitor C12 and the capacitor C13 are connected in parallel, and can play a role in filtering and storing energy.

The utility model is not described in detail, but is well known to those skilled in the art.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A boost circuit driven by a PFC controller comprises a rectifying module (100), a control module (200), a driving module (300) and a boost module (400), wherein the rectifying module (100) is connected with the boost module (400), the control module (200) is connected with the driving module (300), and the driving module (300) is connected with the boost module (400);

the boosting module (400) comprises a first boosting circuit and a second boosting circuit, the first boosting circuit and the second boosting circuit are respectively connected with the driving module (300), and the output end of the first boosting circuit is connected with the output end of the second boosting circuit.

2. The boost circuit driven by the PFC controller of claim 1, wherein the first boost circuit comprises an inductor L1A, a diode V3 and a switching tube V13, one end of the inductor L1A is connected to the rectifying module (100), and the other end of the inductor L1A is connected to an anode of the diode V3 and a drain of the switching tube V13 respectively;

the second boost circuit comprises an inductor L2A, a diode V4 and a switch tube V8, one end of the inductor L2A is connected with the rectifying module (100), the other end of the inductor L2A is respectively connected with the anode of the diode V4 and the drain of the switch tube V8, the cathode of the diode V3 is connected with the cathode of the diode V4, and the source of the switch tube V13 is connected with the source of the switch tube V8 and grounded.

3. A boost circuit driven by a PFC controller according to claim 1, wherein the rectifier module (100) comprises a first rectifier bridge B1 and a second rectifier bridge B2, the ac input terminal of the first rectifier bridge B1 is connected to the live line L of the ac power source, the ac input terminal of the second rectifier bridge B2 is connected to the neutral line N of the ac power source, and the negative output terminal of the first rectifier bridge B1 is connected to the positive output terminal of the second rectifier bridge B2.

4. The boost circuit driven by the PFC controller according to claim 1, wherein the control module (200) comprises a PFC control chip, and an AC-input voltage detection circuit (210), an AC-output DC voltage detection circuit (220), an overvoltage detection circuit (230), a voltage compensation loop (240) and an inductive current zero-crossing detection circuit (250) connected with the PFC control chip, the AC-input voltage detection circuit (210) is connected with an input end of the boost module (400), and the AC-output DC voltage detection circuit (220) and the overvoltage detection circuit (230) are connected with an output end of the boost module (400).

5. The boost circuit driven by the PFC controller of claim 1, wherein the PFC control chip is a UCC28063 chip.

6. The boost circuit driven by the PFC controller according to claim 1, wherein the driving module (300) comprises a first driving module (310) and a second driving module (320), and each of the first driving module (310) and the second driving module (320) comprises a signal amplifying unit, a filtering unit and a conducting unit;

7. The boost circuit driven by the PFC controller according to claim 1, further comprising a soft start module (500), wherein the soft start module (500) comprises a resistor R27, a relay K1, and a resistor R14 and a resistor R15 which are connected in series, the resistor R14 is connected with a first end of the relay, the resistor R15 is connected with a second end of the relay, and the resistor R27 is connected with a third end of the relay.

8. The boost circuit driven by the PFC controller according to claim 1, further comprising a current sampling module (700), wherein the current sampling module (700) comprises a plurality of sampling resistors connected in parallel, one end of each of the plurality of sampling resistors is connected with a negative output end of the rectifying module (100), and the other end of each of the plurality of sampling resistors is connected with the control module (200).

9. The boost circuit driven by the PFC controller according to claim 1, further comprising a filter module (600), wherein one end of the filter module (600) is connected to a positive output terminal of the rectifier module (100), the other end of the filter module (600) is connected to a negative output terminal of the rectifier module (100), and the filter module (600) comprises a capacitor C5 and a capacitor C6 which are connected in parallel.

10. The boost circuit driven by the PFC controller of claim 2, wherein the boost module (400) further comprises a plurality of capacitors connected in parallel for energy storage and filtering, one end of each capacitor being connected to a cathode of the diode V4, and the other end of each capacitor being connected to ground.