CN113872431A - Circuit control device and method - Google Patents
Circuit control device and method Download PDFInfo
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- CN113872431A CN113872431A CN202111294849.0A CN202111294849A CN113872431A CN 113872431 A CN113872431 A CN 113872431A CN 202111294849 A CN202111294849 A CN 202111294849A CN 113872431 A CN113872431 A CN 113872431A
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- 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
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- 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
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- 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 transformer, 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 transformer, and the PFC circuit has bus voltage and PFC current; the output circuit is arranged on the secondary side of the high-frequency voltage transformer, and the output end of the output circuit is provided with 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. The application improves the stability of the output voltage.
Description
Technical Field
The present application relates to the field of power supply technologies, and in particular, to a circuit control apparatus and method.
Background
The flyback power supply in the circuit topology of the isolating switch power supply is generally applied to the occasions of low-power supply conversion, and in a commercial air conditioner, a forward power supply is often adopted due to the large requirement on the load capacity. In the prior art, a circuit diagram of a common forward Power supply is shown in fig. 1, L, Q2 and D form a BOOST PFC (Power Factor Correction) circuit, a primary side of a high-frequency transformer T1 gets Power from a bus behind the PFC, and outputs a voltage V0 through an output circuit on a secondary side of the high-frequency transformer T1, a main control unit MCU controls a voltage of a primary side inductor of a high-frequency transformer T1 through a switching tube Q2, and an analog Power supply IC controls a voltage direction of the primary side inductor of the high-frequency transformer T1 through a switching tube Q1.
In the prior art, the main control unit MCU and the analog power supply IC jointly control the primary side inductance of the high-frequency transformer, so that the number of control main bodies is large, the voltage of the primary side inductance is easy to be unstable, and the output voltage is unstable.
Disclosure of Invention
An object of the embodiments of the present application is to provide a circuit control apparatus and method to solve the problem of unstable output voltage. The specific technical scheme is as follows:
in a first aspect, there is provided a circuit control apparatus, the apparatus comprising:
the PFC circuit is arranged on the primary side of the high-frequency voltage transformer, 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 transformer, and the PFC circuit has bus voltage and PFC current;
the output circuit is arranged on the secondary side of the high-frequency voltage transformer, and the output end of the output circuit is provided with 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.
Optionally, the PFC circuit includes:
the PFC inductor is used as a primary side inductor of the high-frequency voltage transformer;
the input end of the switch tube is connected with the output end of the control circuit, the first output end of the switch tube is connected with the PFC inductor, and the second output end of the switch tube is grounded;
and one end of the diode is respectively connected with the first output end of the switching tube and the PFC inductor, and the other end of the diode is connected with the preset end of the control circuit.
Optionally, the control circuit comprises:
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;
and 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 a voltage duty ratio according to the second voltage and a preset carrier voltage so as to control the switching tube to be switched on and off.
Optionally, the first voltage regulating circuit comprises:
a first voltage regulator having an input coupled to the output of the output circuit, the first voltage regulator configured to determine a first voltage error based on the output voltage and an output voltage threshold;
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 a 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 form the first voltage.
Optionally, the second voltage regulating circuit comprises:
one end of the sampling resistor is connected with a preset node, and the PFC current flows through the sampling resistor to form sampling voltage, wherein 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;
and 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 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 switch tube, the driver is used for obtaining a pulse width modulation signal according to the comparison voltage, and the pulse width modulation signal is used for controlling the switch tube to be switched on and off according to the voltage duty ratio.
In a second aspect, a circuit control method is provided, the method comprising:
acquiring output voltage of an output circuit and bus voltage of a PFC circuit, wherein the output circuit is arranged on the secondary side of a high-frequency voltage transformer, the PFC circuit is arranged on the primary side of the high-frequency voltage transformer, and a switching tube in the PFC circuit is used for controlling the voltage direction of primary side inductance of the high-frequency voltage transformer;
and controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current.
Optionally, before the obtaining of the output voltage of the output circuit and the bus voltage of the PFC circuit, the method further includes:
acquiring sampling interval duration;
under the condition that the sampling interval duration does not reach a preset duration threshold, adjusting the initial output voltage and the initial bus voltage according to a preset adjusting 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 through the output voltage, the bus voltage and the PFC current comprises:
obtaining a first voltage error according to the output voltage and an 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 a sampling resistor;
summing the first voltage error and the second voltage error as a first voltage;
taking the ratio of the first voltage and 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, there is provided a power supply comprising the circuit control arrangement of.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides a circuit control device, and the device comprises: the PFC circuit is arranged on the primary side of the high-frequency voltage transformer, 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 transformer, and the PFC circuit has bus voltage and 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 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 output voltage, bus voltage and PFC current.
In this application, adopt a control circuit can control switching tube switch on and close to through the voltage direction and the voltage size of switching tube control primary inductance, this application need not to set up a plurality of control subject, has reduced the control variable of the voltage change of primary inductance, can improve the stability of primary inductance voltage, thereby improves output voltage's stability.
Of course, not all of the above advantages need be achieved in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
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 disclosure;
fig. 3 is a circuit schematic diagram of a circuit control device according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a method for controlling a circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
In order to solve the problems mentioned in the background art, according to an aspect of an embodiment 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 high-frequency voltage regulator comprises a PFC circuit 1, an output circuit 2 and a control circuit 3, wherein the PFC circuit is arranged on the primary side of a 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 the 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. The PFC circuit has a PFC current IpfcAnd bus voltage UcSo that the control circuit can pass the output voltage U of the output circuit0Bus voltage U of PFC circuitcAnd PFC current IpfcAnd controlling the on and off of the switching tube. The switch tube can be an MOS tube, and the application does not specifically limit the switch tube. The circuit control device can be applied to a power supply which is arranged in an electric appliance with a high requirement on load capacity.
In this application, adopt a control circuit can control switching tube switch on and close to through the voltage direction and the voltage size of switching tube control primary inductance, this application need not to set up a plurality of control subject, has reduced the control variable of the voltage change of primary inductance, can improve the stability of primary inductance voltage, thereby improves output voltage's stability. In addition, the controller reduces the number of control bodies, and can reduce the cost of the controller and the area of a Printed Circuit Board (PCB).
Fig. 3 is a schematic diagram of a circuit control device, in which 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 gets power from a bus behind PFC, if a switching tube Q is switched on, the voltage direction of the primary side inductor of the high-frequency transformer is from top to bottom, D1 is switched on, D2 is switched off, and the inductor L1 and the capacitor C1 can 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 cut off, D2 is switched on, and energy stored in L1 and C1 supplies power to a load through D2.
Wherein, PFC circuit includes: the high-frequency transformer comprises a PFC inductor L, a switching tube Q and a diode D, wherein the PFC inductor is simultaneously used as a primary inductor of the high-frequency transformer, the input end of the switching tube is connected with the output end of a control circuit, the first output end of the switching tube is connected with the PFC inductor, the second output end of the switching tube is grounded, and the control circuit controls the voltage direction and the voltage magnitude of the PFC inductor through the switching tube. The method specifically comprises the following steps: when the switch tube is conducted, the voltage direction is from top to bottom, and the voltage value is larger; when the switch tube is turned off, the voltage direction is from bottom to top, and the voltage value is smaller. One end of the diode is respectively connected with the first output end of the switch tube and the PFC inductor, and the other end of the diode is connected with the 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 transformer at the same time, so that the number of components in the control circuit is reduced, and the area of a PCB (printed circuit board) is reduced.
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, the first voltage regulating circuit is used for outputting first voltage according to the bus voltage and the output voltage, and the first voltage regulating circuit can regulate the bus voltage and the output voltage in the control circuit. And 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, and the PFC current flows through the sampling resistor to obtain the sampling voltage of the sampling resistor, so that the sampling voltage (PFC current), the bus voltage and the 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, the driving circuit is used for comparing the second voltage with the preset carrier voltage so as to determine the voltage duty ratio, and then the switching tube is controlled to be switched on and off according to the voltage duty ratio.
In the application, the control circuit is integrated with the PFC current, the bus voltage and the output voltage, and then the switching tube is controlled to be switched on and switched 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 a summer,
the input of the first voltage regulator is connected to the output of the output circuit 3, the first voltage regulator being arranged to receive the output voltage U of the output circuit0Then according to the output voltage U0And an output voltage threshold U0The difference between ref determines the first voltage error Uerror1The first voltage regulator may also adjust the output voltage to be close to 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 the two ends of the bus capacitor is bus voltage.
The input end of the second voltage regulator is connected with the other end of the bus capacitor C, and the second voltage regulator obtains a bus voltage UCThen according to the bus voltage UCAnd bus voltage threshold UCThe difference between ref determines a second voltage error Uerror2The second voltage regulator may also adjust the bus voltage to be close to the bus voltage threshold.
An adder having an input connected to the output of the first voltage regulator and the output of the second voltage regulator, the adder adding the first voltage error Uerror1And a second voltage error Uerror2Is added as the first voltage U1。
In this application, output voltage and bus voltage can be adjusted respectively to first voltage regulator and second voltage regulator, prevents that generator voltage is too high and burns out the consumer and lead to the battery overcharge, also prevents simultaneously that generator voltage from crossing excessively and leading to the consumer to work the malfunction and the battery is not enough to charge.
Wherein the second voltage regulating circuit includes: sampling resistor RSAnd a divider. The circuit between the output end of the control circuit and the ground is PFC current IpfcAny 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 the PFC current can flow 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 resistorr. 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 acquires a sampling voltage UrFirst voltage U output by the sum adder1Then according to the first voltage U1And a sampling voltage UrTo obtain the second voltage U2。
In the application, the PFC current is converted into the sampling voltage through the sampling resistor, so that the PFC current is fused into the control circuit.
Wherein, drive circuit includes: a comparator and a driver. Comparator inputThe input end is connected with the output end of the divider, and the carrier voltage U is preset in the registerbThe comparator compares the second voltage U2And a carrier voltage UbComparing 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 switch 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 (the high level signal and the low level signal), and then the switch tube is controlled to be switched 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-off of the switching tube according to the voltage duty ratio.
The present application further provides a circuit control method, which can be applied to a controller, as shown in fig. 4, and includes the following steps:
step 401: and acquiring 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 the primary side inductor of the high-frequency voltage device.
In the embodiment of the present application, the PFC circuit is disposed on a primary side of the high-frequency transformer, and the PFC circuit has a switching tube capable of controlling a voltage direction and a voltage magnitude of a primary inductor of the high-frequency transformer. 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 the switching tube is controlled to be switched on and off by 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 of the PFC circuit and the PFC current. According to the method and the device, a plurality of control main bodies are not required to be arranged, the control variable of the voltage change of the primary side inductor is reduced, the voltage stability of the primary side inductor can be improved, and therefore the stability of the output voltage is improved. In addition, the controller reduces the number of control bodies, and can reduce the cost of the controller and the area of a Printed Circuit Board (PCB).
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 sampling interval duration; under the condition that the sampling interval duration does not reach a preset duration threshold, adjusting the initial output voltage and the initial bus voltage according to a preset adjusting instruction until the sampling interval duration reaches the preset duration threshold; and taking the adjusted initial output voltage as the output voltage of the output circuit, and taking the adjusted initial bus voltage as the bus voltage of the PFC circuit.
The controller samples once every sampling interval duration, sampled data comprise output voltage, bus voltage and PFC current, if the controller determines that the sampling interval duration does not reach a preset duration threshold, the initial output voltage and the initial bus voltage are adjusted according to a preset adjusting instruction, specifically, the initial voltage is adjusted through a voltage regulator, after the controller determines that the sampling interval duration reaches the preset duration threshold, the controller takes the adjusted initial output voltage as the output voltage of an output circuit, and the adjusted initial bus voltage as the bus voltage of a PFC circuit.
In this application, the controller can prevent that generator voltage is too high and burn out the consumer and lead to the battery overcharge through initial output voltage of voltage regulator regulation and initial busbar voltage, also prevents that generator voltage from crossing excessively and leading to the consumer to work the malfunction and the battery is not enough simultaneously.
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 an 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; adding the error of the first voltage error and the error of the second voltage error to obtain a first voltage; taking the ratio of the first voltage and 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 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 error of the second voltage error through the adder to be used as a first voltage, then uses the ratio of the first voltage to the sampling voltage through the divider to be used as a second voltage, uses the ratio of the second voltage to the carrier voltage through the comparator to be used as a comparison voltage, and finally obtains a pulse width modulation signal through the driver according to the comparison voltage, so that the switching tube is controlled to be switched on and off 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 ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into 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 solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk. It is noted that, in this document, relational terms such as "first" and "second," and the like, may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present 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 (10)
1. A circuit control device, characterized in that the device comprises:
the PFC circuit is arranged on the primary side of the high-frequency voltage transformer, 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 transformer, and the PFC circuit has bus voltage and PFC current;
the output circuit is arranged on the secondary side of the high-frequency voltage transformer, and the output end of the output circuit is provided with 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.
2. The apparatus of claim 1, wherein the PFC circuit comprises:
the PFC inductor is used as a primary side inductor of the high-frequency voltage transformer;
the input end of the switch tube is connected with the output end of the control circuit, the first output end of the switch tube is connected with the PFC inductor, and the second output end of the switch tube is grounded;
and one end of the diode is respectively connected with the first output end of the switching tube and the PFC inductor, and the other end of the diode is connected with the preset end of the control circuit.
3. The apparatus of claim 1, wherein the control circuit comprises:
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;
and 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 a voltage duty ratio according to the second voltage and a preset carrier voltage so as to control the switching tube to be switched on and off.
4. The apparatus of claim 3, wherein the first voltage regulation circuit comprises:
a first voltage regulator having an input coupled to the output of the output circuit, the first voltage regulator configured to determine a first voltage error based on the output voltage and an output voltage threshold;
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 a 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 form the first voltage.
5. The apparatus of claim 3, wherein the second voltage regulation circuit comprises:
one end of the sampling resistor is connected with a preset node, and the PFC current flows through the sampling resistor to form sampling voltage, wherein 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;
and 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.
6. The apparatus of claim 3, 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 switch tube, the driver is used for obtaining a pulse width modulation signal according to the comparison voltage, and the pulse width modulation signal is used for controlling the switch tube to be switched on and off according to the voltage duty ratio.
7. A circuit control method, the method comprising:
acquiring output voltage of an output circuit and bus voltage of a PFC circuit, wherein the output circuit is arranged on the secondary side of a high-frequency voltage transformer, the PFC circuit is arranged on the primary side of the high-frequency voltage transformer, and a switching tube in the PFC circuit is used for controlling the voltage direction of primary side inductance of the high-frequency voltage transformer;
and controlling the on and off of the switching tube through the output voltage, the bus voltage and the PFC current.
8. The method of claim 7, wherein before obtaining the output voltage of the output circuit and the bus voltage of the PFC circuit, the method further comprises:
acquiring sampling interval duration;
under the condition that the sampling interval duration does not reach a preset duration threshold, adjusting the initial output voltage and the initial bus voltage according to a preset adjusting 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.
9. The method of claim 7, wherein the controlling the switching tubes on and off by the output voltage, the bus voltage, and the PFC current comprises:
obtaining a first voltage error according to the output voltage and an 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 a sampling resistor;
summing the first voltage error and the second voltage error as a first voltage;
taking the ratio of the first voltage and 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.
10. A power supply comprising the circuit control arrangement of claims 1-6.
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| CN101340143A (en) * | 2007-11-30 | 2009-01-07 | 马丽娟 | Switch converter of high power factor |
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| US20130194838A1 (en) * | 2012-01-31 | 2013-08-01 | Delta Electronics Inc. | Three-phase soft-switched pfc rectifiers |
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| 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 |
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| 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 |
| US20130194838A1 (en) * | 2012-01-31 | 2013-08-01 | Delta Electronics Inc. | Three-phase soft-switched pfc rectifiers |
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