CN113872431B - Circuit control device and method - Google Patents

Circuit control device and method Download PDF

Info

Publication number
CN113872431B
CN113872431B CN202111294849.0A CN202111294849A CN113872431B CN 113872431 B CN113872431 B CN 113872431B CN 202111294849 A CN202111294849 A CN 202111294849A CN 113872431 B CN113872431 B CN 113872431B
Authority
CN
China
Prior art keywords
voltage
circuit
output
pfc
bus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111294849.0A
Other languages
Chinese (zh)
Other versions
CN113872431A (en
Inventor
张岩
朱永强
殷童欢
颜权枫
宋泽琳
翟志伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202111294849.0A priority Critical patent/CN113872431B/en
Publication of CN113872431A publication Critical patent/CN113872431A/en
Application granted granted Critical
Publication of CN113872431B publication Critical patent/CN113872431B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The application provides a circuit control device and a circuit control method, and belongs to the technical field of power supplies. The device comprises: the PFC circuit is arranged on the primary side of the high-frequency voltage device, a switching tube in the PFC circuit is used for controlling the voltage direction and the voltage magnitude of a primary inductor of the high-frequency voltage device, and the PFC circuit is provided with a bus voltage and a PFC current; the output circuit is arranged on the secondary side of the high-frequency voltage device, and the output end of the output circuit is provided with an output voltage; the control circuit is respectively connected with the output circuit and the PFC circuit and is used for controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current. The application improves the stability of the output voltage.

Description

Circuit control device and method
Technical Field
The present application relates to the field of power technologies, and in particular, to a circuit control device and method.
Background
Flyback power supplies in the circuit topology of the isolating switch power supply are generally applied to low-power supply conversion occasions, and in commercial air conditioners, forward power supplies are often adopted due to high requirements on carrying capacity. In the prior art, as shown in fig. 1, a circuit diagram of a common forward power supply is shown in fig. 1, L, Q and D form a BOOST PFC (Power Factor Correction ) circuit, a primary side of a high-frequency transformer T1 is powered from a bus after PFC, a voltage V0 is output through an output circuit on a secondary side of the high-frequency transformer T1, a main control unit MCU controls the voltage of a primary side inductor of the high-frequency transformer T1 through a switching tube Q2, and an analog power supply IC controls the voltage direction of the primary side inductor of the high-frequency transformer T1 through the switching tube Q1.
In the prior art, the primary side inductance of the high-frequency transformer is controlled by the MCU and the analog power IC together, so that the quantity of control main bodies is large, the primary side inductance voltage is unstable easily, and the output voltage is unstable.
Disclosure of Invention
An object of an embodiment of the present application is to provide a circuit control device and a method for solving the problem of unstable output voltage. The specific technical scheme is as follows:
in a first aspect, there is provided a circuit control device, the device comprising:
the PFC circuit is arranged on the primary side of the high-frequency voltage device, a switching tube in the PFC circuit is used for controlling the voltage direction and the voltage magnitude of a primary inductor of the high-frequency voltage device, and the PFC circuit is provided with a bus voltage and a PFC current;
the output circuit is arranged on the secondary side of the high-frequency voltage device, and the output end of the output circuit is provided with an output voltage;
the control circuit is respectively connected with the output circuit and the PFC circuit and is used for controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current.
Optionally, the PFC circuit includes:
a PFC inductor, the PFC inductor being a primary side inductor of the high frequency voltage device;
the input end of the switching tube is connected with the output end of the control circuit, the first output end of the switching tube is connected with the PFC inductor, and the second output end of the switching tube is grounded;
and one end of the diode is connected with the first output end of the switching tube and the PFC inductor respectively, and the other end of the diode is connected with the preset end of the control circuit.
Optionally, the control circuit includes:
the input end of the first voltage regulating circuit is connected with the output end of the output circuit and the preset end of the PFC circuit, and the first voltage regulating circuit is used for outputting a first voltage according to the bus voltage and the output voltage;
the input end of the second voltage regulating circuit is connected with the output end of the first voltage regulating circuit, the second voltage regulating circuit comprises a sampling resistor, and the second voltage regulating circuit is used for obtaining a second voltage according to the PFC current, the sampling resistor and the first voltage;
the input end of the driving circuit is connected with the output end of the second voltage regulating circuit, the output end of the driving circuit is connected with the input end of the switching tube, and the driving circuit is used for determining the voltage duty ratio according to the second voltage and the preset carrier voltage so as to control the switching tube to be turned on and turned off.
Optionally, the first voltage regulating circuit includes:
the input end of the first voltage regulator is connected with the output end of the output circuit, and the first voltage regulator is used for determining a first voltage error according to the output voltage and an output voltage threshold value;
one end of the bus capacitor is grounded, and the other end of the bus capacitor is connected with the other end of the diode in the PFC circuit;
the input end of the second voltage regulator is connected with the other end of the bus capacitor, and the second voltage regulator is used for determining a second voltage error according to bus voltage and a bus voltage threshold value, wherein the bus voltage is the voltage of the bus capacitor;
and the input end of the adder is respectively connected with the output end of the first voltage regulator and the output end of the second voltage regulator, and the adder is used for adding the first voltage error and the second voltage error to be used as the first voltage.
Optionally, the second voltage regulating circuit includes:
the PFC circuit comprises a sampling resistor, wherein one end of the sampling resistor is connected with a preset node, the PFC current flows through the sampling resistor to form sampling voltage, the PFC current is the current between the output end of the control circuit and the ground, and the preset node is any node between the output end of the control circuit and the ground;
the input end of the divider is respectively connected with the other end of the sampling resistor and the output end of the adder in the first voltage regulating circuit, and the divider is used for obtaining a second voltage according to the ratio of the first voltage to the sampling voltage.
Optionally, the driving circuit includes:
the input end of the comparator is connected with the output end of the divider in the second voltage regulating circuit, and the comparator is used for comparing the second voltage with the carrier voltage to obtain a comparison voltage;
the input end of the driver is connected with the output end of the comparator, the output end of the driver is connected with the input end of the switching tube, and the driver is used for obtaining a pulse width modulation signal according to the comparison voltage, wherein the pulse width modulation signal is used for controlling the switching tube to be turned on and turned off according to the voltage duty ratio.
In a second aspect, there is provided a circuit control method, the method comprising:
obtaining output voltage of an output circuit and bus voltage of a PFC circuit, wherein the output circuit is arranged on a secondary side of a high-frequency voltage device, the PFC circuit is arranged on a primary side of the high-frequency voltage device, and a switching tube in the PFC circuit is used for controlling the voltage direction of a primary inductor of the high-frequency voltage device;
and controlling the switching tube to be turned on and turned off through the output voltage, the bus voltage and the PFC current.
Optionally, before obtaining the output voltage of the output circuit and the bus voltage of the PFC circuit, the method further includes:
acquiring the sampling interval duration;
under the condition that the sampling interval duration does not reach a preset duration threshold, regulating the initial output voltage and the initial bus voltage according to a preset regulating instruction until the sampling interval duration reaches the preset duration threshold;
and taking the regulated initial output voltage as the output voltage of the output circuit, and taking the regulated initial bus voltage as the bus voltage of the PFC circuit.
Optionally, the controlling the on and off of the switching tube by the output voltage, the bus voltage and the PFC current includes:
obtaining a first voltage error according to the output voltage and the output voltage threshold, determining a second voltage error according to the bus voltage and the bus voltage threshold, and determining a sampling voltage according to the PFC current and the sampling resistor;
summing the first voltage error and the second voltage error as a first voltage;
taking the ratio of the first voltage to the sampling voltage as a second voltage;
taking the ratio of the second voltage to a preset carrier voltage as a comparison voltage;
and obtaining a pulse width modulation signal according to the comparison voltage, wherein the pulse width modulation signal is used for controlling the on and off of the switching tube according to the voltage duty ratio.
In a third aspect, a power supply is provided comprising the circuit control device of claim.
The embodiment of the application has the beneficial effects that:
the embodiment of the application provides a circuit control device, which comprises: the PFC circuit is arranged on the primary side of the high-frequency voltage device, a switching tube in the PFC circuit is used for controlling the voltage direction and the voltage magnitude of a primary inductor of the high-frequency voltage device, and the PFC circuit is provided with a bus voltage and a PFC current; the output circuit is arranged on the secondary side of the high-frequency voltage device, and the output end of the output circuit is provided with an output voltage; and the control circuit is respectively connected with the output circuit and the PFC circuit and is used for controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current.
In the application, the on and off of the switching tube can be controlled by adopting one control circuit, so that the voltage direction and the voltage magnitude of the primary inductor are controlled by the switching tube.
Of course, not all of the above advantages need be achieved simultaneously in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a prior art circuit control device;
fig. 2 is a circuit block diagram of a circuit control device according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a circuit control device according to an embodiment of the present application;
fig. 4 is a flowchart of a method for controlling a circuit according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present application, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.
In order to solve the problems mentioned in the background art, according to an aspect of the embodiments of the present application, there is provided a circuit block diagram of a circuit control apparatus, as shown in fig. 2, the apparatus including: the PFC circuit 1, the output circuit 2 and the control circuit 3 are arranged on the primary side of the high-frequency voltage device T1, and a switching tube Q is arranged in the PFC circuit and can control the voltage direction and the voltage magnitude of a primary side inductor of the high-frequency voltage device. The output circuit is arranged on the secondary side of the high-frequency voltage device, the output end of the output circuit is connected with the input end of the control circuit, and the control circuit is connected with the PFC circuit. PFC current I is arranged in PFC circuit pfc And bus voltage U c So that the control circuit can pass the output voltage U of the output circuit 0 Bus voltage U of PFC circuit c And PFC current I pfc And controlling the on and off of the switching tube. The switching tube can be a MOS tube, and the application does not limit the switching tube specifically. The circuit control device can be applied to a power supply, and the power supply is arranged in an electric appliance with high requirements on carrying capacity.
In the application, the on and off of the switching tube can be controlled by adopting one control circuit, so that the voltage direction and the voltage magnitude of the primary inductor are controlled by the switching tube. In addition, the application reduces the control main body, can also reduce the cost of the controller and reduce the area of PCB (printed circuit board).
Fig. 3 is a schematic diagram of a circuit control device, and an output circuit includes a rectifying diode D1, a freewheeling diode D2, a filter capacitor C1, a load, and a filter inductor L1 with an energy storage function. After the primary side of the high-frequency transformer T1 is powered from a bus after PFC, if the switching tube Q is conducted, the voltage direction of the primary side inductor of the high-frequency transformer is from top to bottom, D1 is conducted, D2 is cut off, and the inductor L1 and the capacitor C1 store electric energy while supplying power to a load; if the switching tube Q is turned off, the voltage direction of the primary side inductor of the high-frequency transformer is from bottom to top, D1 is turned off, D2 is turned on, and energy stored in L1 and C1 supplies power to a load through D2.
Wherein, PFC circuit includes: PFC inductance L, switch tube Q and diode D, PFC inductance are as the former limit inductance of high frequency voltage ware simultaneously, and the input of switch tube is connected with control circuit's output, and the first output of switch tube is connected with PFC inductance, and the second output ground of switch tube, and control circuit passes through the voltage direction and the voltage size of switch tube control PFC inductance. The method comprises the following steps: when the switching tube is conducted, the voltage direction is from top to bottom, and the voltage value is large; when the switching tube is turned off, the voltage direction is from bottom to top, and the voltage value is small. One end of the diode is connected with the first output end of the switching tube and the PFC inductor respectively, and the other end of the diode is connected with a preset end of the control circuit.
In the application, the PFC inductor is used as an inductor in the PFC circuit and a primary side inductor of the high-frequency voltage device, so that the number of components in the control circuit is reduced, and the area of a Printed Circuit Board (PCB) is reduced.
Wherein the control circuit includes: the power supply circuit comprises a first voltage regulating circuit, a second voltage regulating circuit and a driving circuit, wherein the input end of the first voltage regulating circuit is connected with the output end of the output circuit and the preset end of the PFC circuit, and the first voltage regulating circuit is used for outputting first voltage according to bus voltage and output voltage, namely, the first voltage regulating circuit can regulate the bus voltage and the output voltage in the control circuit. The preset end of the PFC circuit is the other end of the bus capacitor.
The input end of the second voltage regulating circuit is connected with the output end of the first voltage regulating circuit, the second voltage regulating circuit comprises a sampling resistor, PFC current flows through the sampling resistor to obtain sampling voltage of the sampling resistor, and thus the sampling voltage (PFC current), bus voltage and output voltage are collected in the first voltage regulating circuit.
The input end of the driving circuit is connected with the output end of the second voltage regulating circuit, the output end of the driving circuit is connected with the input end of the switching tube, and the driving circuit is used for comparing according to the second voltage and the preset carrier voltage so as to determine the voltage duty ratio, and then the switching tube is controlled to be turned on and off according to the voltage duty ratio.
In the application, the PFC current, the bus voltage and the output voltage are fused in the control circuit, and then the switching tube is controlled to be turned on and off based on the PFC current, the bus voltage and the output voltage.
Wherein the first voltage regulating circuit includes: a first voltage regulator, a bus capacitor C, a second voltage regulator and an adder,
the input end of the first voltage regulator is connected with the output end of the output circuit 3, and the first voltage regulator is used for receiving the output voltage U of the output circuit 0 Then according to the output voltage U 0 And an output voltage threshold U 0 The difference between ref determines a first voltage error U error1 The first voltage regulator may also adjust the output voltage to be near the output voltage threshold.
And one end of the bus capacitor is grounded, the other end of the bus capacitor is connected with the other end of the diode in the PFC circuit, and the voltage at two ends of the bus capacitor is bus voltage.
An input end of the second voltage regulator is connected with the other end of the bus capacitor C, and the second voltage regulator obtains the bus voltage U C Then according to the bus voltage U C And bus voltage threshold U C The difference between ref determines a second voltage error U error2 The second voltage regulator may also adjust the bus voltage to be near the bus voltage threshold.
The input end of the adder is respectively connected with the output end of the first voltage regulator and the output end of the second voltage regulator, and the adder outputs a first voltage error U error1 And a second voltage error U error2 Is the error sum of the first voltage U 1 。
According to the application, the first voltage regulator and the second voltage regulator can respectively regulate the output voltage and the bus voltage, so that the electric equipment is prevented from being burnt out due to the fact that the generator voltage is too high, the storage battery is prevented from being overcharged, and meanwhile, the electric equipment is prevented from being abnormal in operation and the storage battery is prevented from being undercharged due to the fact that the generator voltage is too low.
Wherein the second voltage regulating circuit includes: sampling resistor R S And a divider. The circuit between the output end of the control circuit and the ground is PFC current I pfc Any node between the output end of the control circuit and the ground can be used as a preset node, one end of the sampling resistor is connected with the preset node, so that PFC current flows through the sampling resistor, and the product of the current value of the PFC current and the resistance value of the sampling resistor is the sampling voltage U of the sampling resistor r . The input end of the divider is respectively connected with the other end of the sampling resistor and the output end of the adder, and the divider obtains the sampling voltage U r And a first voltage U output by the adder 1 Then according to the first voltage U 1 And sampling voltage U r Is a ratio of (1) to (U) 2 。
In the application, PFC current is converted into sampling voltage through the sampling resistor, so that the PFC current is fused into the control circuit.
Wherein the driving circuit includes: a comparator and a driver. The input end of the comparator is connected with the output end of the divider, and the carrier voltage U is preset in the register b The comparator outputs a second voltage U 2 And carrier voltage U b Comparing the voltages to obtain a comparison voltage; the input end of the driver is connected with the output end of the comparator, the output end of the driver is connected with the input end of the switching tube, when the comparison voltage is larger than 1, the driver outputs a high-level signal, when the comparison voltage is smaller than 1, the driver outputs a low-level signal, the driver determines the voltage duty ratio through pulse width modulation signals (high-level signal and low-level signal), and then the switching tube is controlled to be turned on and off according to the voltage duty ratio.
In the application, the driving circuit determines the voltage duty ratio through the pulse width modulation signal, and then realizes the automatic on and off of the switching tube according to the voltage duty ratio.
The application also provides a circuit control method which can be applied to a controller, as shown in fig. 4, and comprises the following steps:
step 401: and obtaining the output voltage of the output circuit, the bus voltage of the PFC circuit and the PFC current.
The output circuit is arranged on the secondary side of the high-frequency voltage device, the PFC circuit is arranged on the primary side of the high-frequency voltage device, and a switching tube in the PFC circuit is used for controlling the voltage direction of a primary inductor of the high-frequency voltage device.
In the embodiment of the application, the PFC circuit is arranged on the primary side of the high-frequency voltage device, and a switching tube is arranged in the PFC circuit and can control the voltage direction and the voltage magnitude of the primary side inductance of the high-frequency voltage device. The output circuit is arranged on the secondary side of the high-frequency voltage device, the output end of the output circuit is connected with the input end of the control circuit, and the control circuit is connected with the PFC circuit. The controller obtains the output voltage of the output circuit, the bus voltage of the PFC circuit and the PFC current.
Step 402: and controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current.
The control circuit can control the on and off of the switching tube through the output voltage of the output circuit, the bus voltage and the PFC current of the PFC circuit. According to the application, a plurality of control main bodies are not required to be arranged, so that the control variable of the voltage change of the primary inductor is reduced, and the stability of the voltage of the primary inductor can be improved, thereby improving the stability of the output voltage. In addition, the application reduces the control main body, can also reduce the cost of the controller and reduce the area of PCB (printed circuit board).
As an optional implementation manner, before obtaining the output voltage of the output circuit and the bus voltage of the PFC circuit, the method further includes: acquiring the sampling interval duration; under the condition that the sampling interval duration does not reach the preset duration threshold, the initial output voltage and the initial bus voltage are regulated according to a preset regulating instruction until the sampling interval duration reaches the preset duration threshold; and taking the regulated initial output voltage as the output voltage of the output circuit, and taking the regulated initial bus voltage as the bus voltage of the PFC circuit.
The controller samples once every sampling interval time, the sampled data comprise output voltage, bus voltage and PFC current, if the controller determines that the sampling interval time does not reach a preset time threshold, the controller adjusts the initial output voltage and the initial bus voltage according to a preset adjusting instruction, specifically, the voltage regulator adjusts the initial voltage, when the controller determines that the sampling interval time reaches the preset time threshold, the controller takes the adjusted initial output voltage as the output voltage of the output circuit, and takes the adjusted initial bus voltage as the bus voltage of the PFC circuit.
In the application, the controller can regulate the initial output voltage and the initial bus voltage through the voltage regulator, so that the electric equipment is prevented from being burnt out due to the overhigh voltage of the generator and the storage battery is prevented from being overcharged, and meanwhile, the electric equipment is prevented from being abnormal in operation and the storage battery is prevented from being undercharged due to the overlow voltage of the generator.
As an alternative embodiment, controlling the on and off of the switching tube by the output voltage, the bus voltage and the PFC current includes: obtaining a first voltage error according to the output voltage and the output voltage threshold, determining a second voltage error according to the bus voltage and the bus voltage threshold, and determining a sampling voltage according to the PFC current and the sampling resistor; summing the error of the first voltage error and the second voltage error as a first voltage; taking the ratio of the first voltage to the sampling voltage as a second voltage; taking the ratio of the second voltage to the preset carrier voltage as a comparison voltage; and obtaining a pulse width modulation signal according to the comparison voltage, wherein the pulse width modulation signal is used for controlling the on and off of the switching tube according to the voltage duty ratio.
In the embodiment of the application, the controller obtains a first voltage error according to the output voltage and the output voltage threshold, determines a second voltage error according to the bus voltage and the bus voltage threshold, and determines the sampling voltage according to the PFC current and the sampling resistor. The controller adds the error of the first voltage error and the second voltage error to be used as a first voltage through an adder, then uses the ratio of the first voltage to the sampling voltage as a second voltage through a divider, uses the ratio of the second voltage to the carrier voltage as a comparison voltage through a comparator, and finally obtains a pulse width modulation signal through a driver according to the comparison voltage, thereby controlling the on and off of the switching tube according to the voltage duty ratio.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc. It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A circuit control device, the device comprising:
the PFC circuit is arranged on the primary side of the high-frequency voltage device, a switching tube in the PFC circuit is used for controlling the voltage direction and the voltage magnitude of a primary inductor of the high-frequency voltage device, and the PFC circuit is provided with a bus voltage and a PFC current;
the output circuit is arranged on the secondary side of the high-frequency voltage device, and the output end of the output circuit is provided with an output voltage;
the control circuit is respectively connected with the output circuit and the PFC circuit and is used for controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current;
wherein, the PFC circuit includes:
a PFC inductor, the PFC inductor being a primary side inductor of the high frequency voltage device;
the input end of the switching tube is connected with the output end of the control circuit, the first output end of the switching tube is connected with the PFC inductor, and the second output end of the switching tube is grounded;
one end of the diode is connected with the first output end of the switching tube and the PFC inductor respectively, and the other end of the diode is connected with a preset end of the control circuit;
wherein the control circuit includes:
the input end of the first voltage regulating circuit is connected with the output end of the output circuit and the preset end of the PFC circuit, and the first voltage regulating circuit is used for outputting a first voltage according to the bus voltage and the output voltage;
the input end of the second voltage regulating circuit is connected with the output end of the first voltage regulating circuit, the second voltage regulating circuit comprises a sampling resistor, and the second voltage regulating circuit is used for obtaining a second voltage according to the PFC current, the sampling resistor and the first voltage;
the input end of the driving circuit is connected with the output end of the second voltage regulating circuit, the output end of the driving circuit is connected with the input end of the switching tube, and the driving circuit is used for determining the voltage duty ratio according to the second voltage and the preset carrier voltage so as to control the switching tube to be turned on and turned off.
2. The apparatus of claim 1, wherein the first voltage regulation circuit comprises:
the input end of the first voltage regulator is connected with the output end of the output circuit, and the first voltage regulator is used for determining a first voltage error according to the output voltage and an output voltage threshold value;
one end of the bus capacitor is grounded, and the other end of the bus capacitor is connected with the other end of the diode in the PFC circuit;
the input end of the second voltage regulator is connected with the other end of the bus capacitor, and the second voltage regulator is used for determining a second voltage error according to bus voltage and a bus voltage threshold value, wherein the bus voltage is the voltage of the bus capacitor;
and the input end of the adder is respectively connected with the output end of the first voltage regulator and the output end of the second voltage regulator, and the adder is used for adding the first voltage error and the second voltage error to be used as the first voltage.
3. The apparatus of claim 1, wherein the second voltage regulation circuit comprises:
the PFC circuit comprises a sampling resistor, wherein one end of the sampling resistor is connected with a preset node, the PFC current flows through the sampling resistor to form sampling voltage, the PFC current is the current between the output end of the control circuit and the ground, and the preset node is any node between the output end of the control circuit and the ground;
the input end of the divider is respectively connected with the other end of the sampling resistor and the output end of the adder in the first voltage regulating circuit, and the divider is used for obtaining a second voltage according to the ratio of the first voltage to the sampling voltage.
4. The apparatus of claim 1, wherein the drive circuit comprises:
the input end of the comparator is connected with the output end of the divider in the second voltage regulating circuit, and the comparator is used for comparing the second voltage with the carrier voltage to obtain a comparison voltage;
the input end of the driver is connected with the output end of the comparator, the output end of the driver is connected with the input end of the switching tube, and the driver is used for obtaining a pulse width modulation signal according to the comparison voltage, wherein the pulse width modulation signal is used for controlling the switching tube to be turned on and turned off according to the voltage duty ratio.
5. A circuit control method applied to the circuit control device according to claim 1, characterized in that the method comprises:
acquiring output voltage of an output circuit, bus voltage and PFC current in a PFC circuit, wherein the output circuit is arranged on a secondary side of a high-frequency voltage device, the PFC circuit is arranged on a primary side of the high-frequency voltage device, and a switching tube in the PFC circuit is used for controlling the voltage direction of a primary inductor of the high-frequency voltage device;
controlling the switching tube to be turned on and off through the output voltage, the bus voltage and the PFC current;
wherein, through the output voltage, the bus voltage and the PFC current, the control of the on and off of the switching tube comprises:
obtaining a first voltage error according to the output voltage and the output voltage threshold, determining a second voltage error according to the bus voltage and the bus voltage threshold, and determining a sampling voltage according to the PFC current and the sampling resistor;
summing the first voltage error and the second voltage error as a first voltage;
taking the ratio of the first voltage to the sampling voltage as a second voltage;
taking the ratio of the second voltage to a preset carrier voltage as a comparison voltage;
and obtaining a pulse width modulation signal according to the comparison voltage, wherein the pulse width modulation signal is used for controlling the on and off of the switching tube according to the voltage duty ratio.
6. The method of claim 5, wherein prior to obtaining the output voltage of the output circuit and the bus voltage of the PFC circuit, the method further comprises:
acquiring the sampling interval duration;
under the condition that the sampling interval duration does not reach a preset duration threshold, regulating the initial output voltage and the initial bus voltage according to a preset regulating instruction until the sampling interval duration reaches the preset duration threshold;
and taking the regulated initial output voltage as the output voltage of the output circuit, and taking the regulated initial bus voltage as the bus voltage of the PFC circuit.
7. A power supply comprising the circuit control device of any one of claims 1-4.
CN202111294849.0A 2021-11-03 2021-11-03 Circuit control device and method Active CN113872431B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111294849.0A CN113872431B (en) 2021-11-03 2021-11-03 Circuit control device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111294849.0A CN113872431B (en) 2021-11-03 2021-11-03 Circuit control device and method

Publications (2)

Publication Number Publication Date
CN113872431A CN113872431A (en) 2021-12-31
CN113872431B true CN113872431B (en) 2023-10-10

Family

ID=78986877

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111294849.0A Active CN113872431B (en) 2021-11-03 2021-11-03 Circuit control device and method

Country Status (1)

Country Link
CN (1) CN113872431B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101340143A (en) * 2007-11-30 2009-01-07 马丽娟 Switch converter of high power factor
CN103023323A (en) * 2011-09-20 2013-04-03 万国半导体(开曼)股份有限公司 Average inductive current type voltage control method and variable reference voltage generating device used by method
CN104953813A (en) * 2015-06-26 2015-09-30 广东美的制冷设备有限公司 Method and device for preventing output voltage of PFC (power factor correction) circuit from getting up to overvoltage
CN105186919A (en) * 2015-07-24 2015-12-23 珠海格力电器股份有限公司 Non-isolated grid-connected converter, air-conditioning system and converter control method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8687388B2 (en) * 2012-01-31 2014-04-01 Delta Electronics, Inc. Three-phase soft-switched PFC rectifiers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101340143A (en) * 2007-11-30 2009-01-07 马丽娟 Switch converter of high power factor
CN103023323A (en) * 2011-09-20 2013-04-03 万国半导体(开曼)股份有限公司 Average inductive current type voltage control method and variable reference voltage generating device used by method
CN104953813A (en) * 2015-06-26 2015-09-30 广东美的制冷设备有限公司 Method and device for preventing output voltage of PFC (power factor correction) circuit from getting up to overvoltage
CN105186919A (en) * 2015-07-24 2015-12-23 珠海格力电器股份有限公司 Non-isolated grid-connected converter, air-conditioning system and converter control method

Also Published As

Publication number Publication date
CN113872431A (en) 2021-12-31

Similar Documents

Publication Publication Date Title
CN108631578B (en) Control unit for switching converter operating in continuous conduction and peak current control mode
US9621028B2 (en) Digitally controlled PFC converter with multiple discontinuous modes
EP2187512B1 (en) Method and apparatus to control a power factor correction circuit
JP5104947B2 (en) Switching power supply
US20160164424A1 (en) Method and apparatus for integrated cable drop compensation of a power converter
CN106549580B (en) System and method for controlling a power conversion system
US8368361B2 (en) Switching power converter controller with direct current transformer sensing
CN109039028B (en) Control circuit applied to power adapter and power adapter
US9684320B2 (en) DC-DC converter and method for controlling the same and power supply of energy storage system including the same DC-DC converter
CN105281556A (en) Control circuit implementing method for controlling switching power factor corrector, PFC and AC/DC converter
CN105048795A (en) Enhanced power factor correction
WO2005062451A1 (en) Method for input current regulation and active-power filter with input voltage feedforward and output load feedforward
WO2009099865A1 (en) Delta sigma modulator with unavailable output values
US8810215B2 (en) Power supply with dynamic input current suppression
KR20150083039A (en) Cable compensation by zero-crossing compensation current and resistor
WO2015184337A1 (en) Adaptive cable drop compensation
US11682964B2 (en) Driving circuit and driving method
JP2010041891A (en) Charger
US20170235359A1 (en) Controller
CN114531033A (en) Converter with a voltage detection circuit
CN113872431B (en) Circuit control device and method
EP3151400A1 (en) Resonant converter circuit
EP1316139B1 (en) Active power factor correction
CN112260558A (en) AC-DC conversion circuit and method and charger
CN113794368A (en) Flyback switching power supply control device and method and flyback switching power supply

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant