CN115149834A - Resonance booster circuit and control method and device thereof - Google Patents
Resonance booster circuit and control method and device thereof Download PDFInfo
- Publication number
- CN115149834A CN115149834A CN202210881109.5A CN202210881109A CN115149834A CN 115149834 A CN115149834 A CN 115149834A CN 202210881109 A CN202210881109 A CN 202210881109A CN 115149834 A CN115149834 A CN 115149834A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- output
- resonance
- alternating current
- 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.)
- Pending
Links
Images
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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a resonance booster circuit and a control method and a device thereof, wherein the resonance booster circuit comprises an LC resonance circuit, a booster transformer and a frequency detection circuit, the LC resonance circuit is connected with a primary side coil of the booster transformer, and converts direct current into alternating current with preset frequency according to a control signal input by a main control chip; a step-up transformer for stepping up the alternating current output from the LC resonance circuit to supply a drive voltage to a load connected to a secondary side coil thereof; and the frequency detection circuit is used for detecting the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer, converting the current direction and the change period information into weak current signals and outputting the weak current signals to the main control chip, so that the main control chip adjusts the control signals of the LC resonance circuit to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency. The invention solves the problem of larger error of resonance state and frequency detection, and has the advantages of simple method, no loss, small error and high safety.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a resonance booster circuit and a control method and device thereof.
Background
In the field of current electronic circuit technology, inverting a low-voltage direct-current voltage into a high-voltage alternating current by using the principle of LC resonance has been applied to various fields. In the resonant circuit, the direct current is inverted into the alternating current by controlling the on-off time of the switching element, and specifically, the on-off of the switching element is controlled by providing a PWM wave with a preset duty ratio and frequency to the switching element through the main control chip. After the direct current is converted into alternating current with preset frequency, primary boosting is achieved by means of resonance generated between the capacitor and an inductance coil on the primary side of the boosting transformer. However, since the load connected to the secondary side of the step-up transformer generates a high-voltage discharge phenomenon at the moment of starting, the frequency is high and unstable, and the perfect shock cannot be generated after power-on.
In the prior art, in order to detect the resonance state and frequency, an attenuation bar is generally connected to the secondary side of a step-up transformer and observed by connecting an oscilloscope. However, the following disadvantages exist in this detection method: the operation process of observing the seismic frequency by adopting the attenuation bar and the oscilloscope is more complicated; the attenuation rod has inductive and capacitive characteristics, is equivalent to an access load in a high-frequency state, can affect a test result, and has a large error; the high-voltage attenuation rod is connected on the transformer in parallel to be connected with the oscilloscope in the measuring process, and the voltage of the booster transformer can reach thousands of volts, so that great potential safety hazards are brought to the operating process.
Disclosure of Invention
The invention provides a resonance booster circuit and a control method and a control device thereof, which are used for solving the problems of complex operation, large error and potential safety hazard of a resonance state observation and adjustment means in the background art.
In order to achieve the above object, a specific technical solution of the resonant boost circuit of the present invention is as follows:
in one aspect of the present invention, there is provided a resonant boost circuit,
comprises an LC resonance circuit, a step-up transformer and a frequency detection circuit,
the LC resonance circuit is connected with the primary side coil of the boosting transformer, and converts direct current output by the direct current power supply into alternating current with preset frequency according to a control signal input by the main control chip;
the boosting transformer is used for boosting the alternating current output by the LC resonance circuit so as to provide a driving voltage for a load connected to a secondary side coil of the boosting transformer;
the frequency detection circuit is arranged on the primary side or the secondary side of the boosting transformer and used for detecting the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer and converting the current direction and the change period information of the alternating current into weak current signals to be output to the main control chip, so that the main control chip adjusts the control signals of the LC resonance circuit according to the current direction and the change period information of the alternating current to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
Further, the frequency detection circuit comprises a detection coil and a current detection branch circuit connected in parallel with the detection coil, wherein the detection coil is arranged on the primary side or the secondary side of the step-up transformer and used for sensing the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the step-up transformer, and the current detection branch circuit is used for converting the current direction and the change period information of the alternating current into weak current signals and outputting the weak current signals to the main control chip.
Further, the current detection branch road includes forward current detection branch road, forward current detection branch road includes first photoelectric coupler, the input anode end of first photoelectric coupler connect in the first port of detection coil, the input cathode end connect in the second port of detection coil, output collector end is connected in the low voltage power, and output emitter is extremely ground first output port is drawn between the output collector end of first photoelectric coupler and the connecting terminal of low voltage power, when the voltage of the first port of detection coil is higher than the second port, the output of first photoelectric coupler is inside to be switched on, and first output port outputs low level signal.
Further, its characterized in that, the current detection branch road includes negative current detection branch road, negative current detection branch road includes second photoelectric coupler, the input anode end of second photoelectric coupler connect in the second port of detection coil, the input cathode end connect in the first port of detection coil, output collector end is connected in the low-voltage power supply, and output emitter is extremely ground, draw forth the second output port between the output collector end of second photoelectric coupler and the connecting terminal of low-voltage power supply, when the voltage of the second port of detection coil is higher than first port, the output of second photoelectric coupler is inside to be switched on, and the second output port outputs low level signal.
Further, the forward current detection branch circuit further comprises a first resistor, and the first resistor is connected between the input cathode end of the first photoelectric coupler and the second port of the detection coil.
Further, the forward current detection branch circuit further comprises a second resistor, and the second resistor is connected between the output emitter terminal of the first photoelectric coupler and the ground.
Further, the negative current detection branch circuit further comprises a third resistor, and the third resistor is connected between the input cathode end of the second photoelectric coupler and the first port of the detection coil.
Further, the negative current detection branch circuit further comprises a fourth resistor, and the fourth resistor is connected between the output emitter terminal of the second photoelectric coupler and the ground.
Furthermore, the LC resonant circuit includes a first switch element, a second switch element, a first inductor, a second inductor, and a first capacitor, the positive electrode of the dc power supply is connected in series with the first inductor and then connected to the current input terminal of the electrical terminal of the first switch element and the first port of the primary side coil of the step-up transformer, the negative electrode of the dc power supply is connected in series with the second inductor and then connected to the current output terminal of the electrical terminal of the second switch element and the second port of the primary side coil of the step-up transformer, the current output terminal of the electrical terminal of the first switch element and the current input terminal of the electrical terminal of the second switch element are respectively grounded, the first capacitor is connected in parallel with the primary side coil of the step-up transformer, and the main control chip controls the turn-on and turn-off time of the first switch element and the second switch element by respectively inputting PWM control signals to the enable terminal of the first switch element and the enable terminal of the second switch element, so as to control the LC resonant circuit to convert the dc power output by the dc power supply into ac power of the preset frequency.
Further, the current detection branch circuit includes a second forward current electrical detection branch circuit, the second forward current detection branch circuit includes a first diode, a third switching element and a fifth resistor, an anode of the first diode is connected to the first port of the detection coil, a cathode of the first diode is connected to the enable end of the third switching element and one end of the fifth resistor, the other end of the fifth resistor is connected to the second port of the detection coil, the second port of the detection coil is grounded, the current input end of the electrical terminal of the third switching element is connected to the low-voltage power supply, the current output end of the electrical terminal of the third switching element is grounded, a third output port is led out between the current input end of the electrical terminal of the third switching element and the connection terminal of the low-voltage power supply, when the voltage of the first port of the detection coil is higher than the second port, the first diode is turned on, the enable end of the third switching element inputs a high level, the electrical terminal of the third switching element is turned on, and the third output a low-level signal.
Further, the frequency detection circuit includes a sixth resistor connected in series between the detection coil and the current detection branch.
In another aspect of the present invention, a method for controlling the resonant boost circuit is provided, where the method includes:
acquiring the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer;
judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency or not according to the current direction of the alternating current and the change period information;
and if the frequency of the alternating current output by the LC resonance circuit is inconsistent with the frequency of the alternating current output by the LC resonance circuit, adjusting the control signal of the LC resonance circuit to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
Further, the current direction and change period information of the alternating current includes: a first period duration when the current of the alternating current is in a positive direction and a second period duration when the current of the alternating current is in a negative direction;
the judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency according to the current direction of the alternating current and the change period information comprises:
judging whether the first period time length is equal to a second period time length;
if so, judging whether the sum of the first period time length and the second period time length is equal to the resonance period of the LC resonance circuit;
if the current direction change frequency of the alternating current output by the LC resonance circuit is equal to the resonance frequency, the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency.
In another aspect of the present invention, there is provided a control apparatus for the above resonant boost circuit, the apparatus including:
the acquisition module is used for acquiring the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer;
the judging module is used for judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency or not according to the current direction of the alternating current and the change period information;
and the control module is used for adjusting the control signal of the LC resonance circuit to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency if the alternating current is inconsistent with the alternating current.
The invention provides a resonance booster circuit and a control method and a device thereof, which utilize a frequency detection circuit to detect the current direction and the change period information of alternating current of a primary side coil or a secondary side coil of a booster transformer, convert the current direction and the change period information of the alternating current into weak current signals and output the weak current signals to a main control chip, so that the main control chip adjusts the control signals of an LC resonance circuit according to the current direction and the change period information of the alternating current to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a resonant boost circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a resonant boost circuit provided in accordance with an embodiment of the present invention;
fig. 3 is a waveform diagram of an ac output by the LC resonant circuit corresponding to the PWM2 signal output by the main control chip;
FIG. 4 is a circuit diagram of a resonant boost circuit according to yet another embodiment of the present invention;
FIG. 5 is a circuit diagram of a frequency detection circuit according to another embodiment of the present invention;
fig. 6 is a flowchart of a control method of a resonant boost circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a control device of a resonant boost circuit according to an embodiment of the invention.
The notation in the figure is:
101. an LC resonance circuit; 102. a load; 103. a frequency detection circuit;
701. an acquisition module; 702. a judgment module; 703. and a control module.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 schematically shows a block diagram of a resonant boost circuit according to an embodiment, as shown in fig. 1, the resonant boost circuit according to the embodiment of the present invention includes an LC resonant circuit 101, a boost transformer T1, and a frequency detection circuit 103, where the LC resonant circuit 101 is connected to a primary side coil of the boost transformer T1, and converts a direct current output by a direct current power supply into an alternating current with a preset frequency according to a control signal input by a main control chip; a step-up transformer T1 for stepping up the alternating current output from the LC resonant circuit 101 to supply a drive voltage to a load 102 connected to a secondary side coil thereof; the frequency detection circuit 103 is disposed on the primary side or the secondary side of the step-up transformer T1, and is configured to detect a current direction and change period information of an alternating current of the primary side coil or the secondary side coil of the step-up transformer T1, and convert the current direction and change period information of the alternating current into a weak current signal to be output to the main control chip, so that the main control chip adjusts a control signal of the LC resonant circuit 101 according to the current direction and change period information of the alternating current, so that the frequency of the alternating current output by the LC resonant circuit satisfies a resonant frequency.
It should be noted that the main control chip according to the embodiment of the present invention is a control chip for controlling the normal operation of the resonant boost circuit, and controls the on and off of the switching element of the LC resonant circuit 101 by outputting a PWM square wave signal. And judges that the frequency of the alternating current output by the LC resonance circuit 101 satisfies the resonance frequency by receiving the weak current signal input by the frequency detection circuit 103, thereby adjusting the frequency and/or duty ratio of the PWM square wave signal output by the same to satisfy the resonance frequency. In the embodiment of the present invention, the weak current signal output by the frequency detection circuit 103 may be directly transmitted to the main control chip, or may be first transmitted to a dedicated receiving chip, and the data is processed by the receiving chip and then transmitted to the main control chip, which is not limited in the present invention.
Further, the frequency detection circuit 103 includes a detection coil disposed on the primary side or the secondary side of the step-up transformer T1 and a current detection branch circuit disposed in parallel with the detection coil, and forms another transformer T2 with the iron core of the step-up transformer for sensing the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the step-up transformer T1, and the current detection branch circuit is configured to convert the current direction and the change period information of the alternating current into a weak current signal and output the weak current signal to the main control chip. It should be noted that, in order to improve the safety of measurement, the number of turns of the detection coil may be set to be smaller than the number of turns of the primary side coil or the secondary side coil of the step-up transformer, so as to perform the function of voltage reduction. The number of turns can be set according to the thread engineering requirement, and the invention is not limited.
In order to more clearly describe the circuit structure of the resonant boost circuit according to the embodiment of the present invention, fig. 2 schematically shows a circuit diagram of a resonant boost circuit according to another embodiment of the present invention. As can be seen from fig. 2, in the LC resonant circuit according to the embodiment of the present invention, the first switching element Q1, the second switching element Q2, the first inductor L1, the second inductor L2, and the first capacitor C are MOS transistors, and the switching element according to the embodiment of the present invention may also be a switching element with corresponding switching performance according to requirements, which is not limited by the present invention, and the following description will be given by taking the LC resonant circuit shown in fig. 2 as an example: the positive electrode of the dc power supply is connected in series with the first inductor L1 and then connected to the current input terminal of the electrical terminal of the first switching element Q1 (i.e., the drain of the first MOS transistor) and the first port of the primary side coil of the step-up transformer, the negative electrode of the dc power supply is connected in series with the second inductor L2 and then connected to the current output terminal of the electrical terminal of the second switching element Q2 (i.e., the gate of the second MOS transistor) and the second port of the primary side coil of the step-up transformer, the current output terminal of the electrical terminal of the first switching element Q1 (i.e., the gate of the first MOS transistor) and the current input terminal of the electrical terminal of the second switching element (i.e., the drain of the second MOS transistor) are respectively grounded, the first capacitor C is connected in parallel with the primary side coil of the step-up transformer, and the main control chip respectively inputs PWM control signals to the enable terminal of the first switching element Q1 (i.e., the source of the first MOS transistor) and the enable terminal of the second switching element Q2 (i.e., the source of the second MOS transistor) to control the turn-off time of the on/off of the resonant circuit 101 to convert the dc power supply to the preset ac output of the LC resonant circuit.
Specifically, the main control chip inputs a first control signal PWM1 to an enable terminal of the first switching element Q1, and inputs a second control signal PWM2 to an enable terminal of the second switching element Q2 to control the first switching element Q1 and the second switching element Q2 to be turned on and off. The PWM1 and the PWM2 are square wave signals, when the PWM1 square wave is at a high level to turn on the first switching element Q1, the PWM2 square wave is at a low level to turn off the second switching element Q2, the dc power supply charges the first capacitor C through the second inductor L2, when the PWM1 square wave is at a low level to turn off the first switching element Q1, the PWM2 square wave is at a high level to turn on the second switching element Q2, the dc power supply charges the first capacitor C through the first inductor L2, because the first capacitor C is connected in parallel with the primary side coil of the step-up transformer T1, the two carry out charge and discharge cycles with each other to generate parallel resonance, so that sine wave voltages are generated at two ends of the first capacitor C, thereby completing conversion of the dc power output from the dc power supply into ac power of a preset frequency, as shown in fig. 3, a waveform diagram of the ac power output by the LC resonance circuit corresponding to the PWM2 signal output from the main control chip.
In the actual operation of the circuit, the frequency of the alternating current output by the LC resonant circuit 101 cannot satisfy the resonant frequency due to the influence of various interference factors, so that the resonant booster circuit cannot operate normally. Therefore, the frequency detection circuit 103 is arranged to monitor the frequency of the alternating current output by the LC resonant circuit 101 in real time, so that the main control chip adjusts the duty ratio and/or frequency of the control signal of the LC resonant circuit 101, that is, the duty ratio and frequency of PWM1 and PWM2, according to the current direction and the change period information of the alternating current output by the LC resonant circuit 101, so that the frequency of the alternating current output by the LC resonant circuit 101 meets the resonant frequency.
Specifically, the frequency detection circuit 103 includes a detection coil and a current detection branch circuit connected in parallel with the detection coil, the detection coil is disposed on the primary side or the secondary side of the step-up transformer and is used for sensing the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the step-up transformer, and the current detection branch circuit is used for converting the current direction and the change period information of the alternating current into a weak current signal and outputting the weak current signal to the main control chip.
Further, the current detection branch comprises a forward current detection branch, the forward current detection branch comprises a first photoelectric coupler U1, an input anode end of the first photoelectric coupler U1 is connected to a first port A of the detection coil, an input cathode end of the first photoelectric coupler U1 is connected to a second port B of the detection coil, an output collector end of the first photoelectric coupler U1 is connected to the low-voltage power supply, an output emitter end of the first photoelectric coupler U1 is grounded, a first output port I/O1 is led out between an output collector end of the first photoelectric coupler U1 and a connecting terminal of the low-voltage power supply, when the voltage of the first port A of the detection coil is higher than that of the second port, the output end of the first photoelectric coupler U1 is internally conducted, the first output port I/O1 outputs a low-level signal, and when the voltage of the first port A of the detection coil is lower than that of the second port, the output end of the first photoelectric coupler U1 is internally turned off, and the first output port I/O1 outputs a high-level signal.
Further, the current detection branch comprises a negative current detection branch, the negative current detection branch comprises a second photoelectric coupler U2, an input anode end of the second photoelectric coupler U2 is connected to a second port B of the detection coil, an input cathode end of the second photoelectric coupler U2 is connected to a first port a of the detection coil, an output collector end of the detection coil is connected to the low-voltage power supply, an output emitter end of the detection coil is grounded, a second output port I/O1 is led out between the output collector end of the second photoelectric coupler and a connection terminal of the low-voltage power supply, when the voltage of the second port B of the detection coil is higher than that of the first port, the output end of the second photoelectric coupler is internally conducted, the second output port I/O1 outputs a low-level signal, and when the voltage of the first port a of the detection coil is higher than that of the second port, the output end of the second photoelectric coupler U2 is internally turned off, and the second output port I/O1 outputs a high-level signal.
It should be noted that the high-level signal and the low-level signal are both weak-point signals, where the high-level signal is a signal close to the amplitude of the low-voltage power supply, the amplitude of the low-voltage power supply may be 5V as shown in the drawing, or may be other low-level signals according to the requirement of the main control chip on the input signal, and the low-level signal is a signal close to zero level.
In addition, the current detection branch according to the embodiment of the present invention may include one or two of a positive current detection branch and a negative current detection branch, and may be specifically set according to a control schedule. In the above-described embodiment, when the first output port I/O1 outputs a low level signal, the direction of the alternating current output from the LC resonance circuit 101 may be considered to be positive, and when the second output port I/O1 outputs a low level signal, the direction of the alternating current output from the LC resonance circuit 101 may be considered to be negative. At this time, it is recorded that the first period duration of the positive conduction is T1, the second period duration of the negative conduction is T2, and only when T1= T2, and T1+ T2= T, where T is the inverse of the resonant frequency f, i.e. the resonant period. It should be noted that, when the current detection branch in the embodiment of the present invention includes only a positive current detection branch or only a negative current detection branch, taking the case of including only the positive current detection branch as an example, a first period duration of positive conduction when the first output port I/O1 outputs a low level signal may be t1, and a second period duration of negative conduction when the first output port I/O1 outputs a high level signal may be t2.
Further, when an error caused by the fact that the zero crossing of the voltage exceeds a certain amplitude value when the on-off of the photoelectric coupler is not considered, only one current detection branch can be selected, and by taking the selection of only the positive current detection branch as an example, when the first output port I/O1 outputs a low level signal, the direction of the alternating current output by the LC resonance circuit 101 is considered to be a positive direction, and when the first output port I/O1 outputs a high level signal, the direction of the alternating current output by the LC resonance circuit 101 is considered to be a negative direction. By recording the signal output from the first output port I/O1, the current direction and the change cycle information of the alternating current output from the LC resonant circuit 101 can be determined.
Furthermore, in order to improve the safety of the circuit, a resistor can be connected in each branch in series to limit the circuit and avoid the damage to each power device caused by overlarge current. Specifically, referring to fig. 4, the forward current detection branch further includes a first resistor R1, and the first resistor R1 is connected between the input cathode end of the first photocoupler U1 and the second port B of the detection coil. The forward current detection branch circuit further comprises a second resistor R2, and the second resistor R2 is connected between the output emitter terminal of the first photoelectric coupler U1 and the ground. The negative current detection branch circuit further comprises a third resistor R3, and the third resistor R3 is connected between the input cathode end of the second photoelectric coupler U2 and the first port A of the detection coil. The negative current detection branch circuit further comprises a fourth resistor R4, and the fourth resistor R4 is connected between the output emitter terminal of the second photoelectric coupler and the ground.
In addition, the function of the current of the positive current measuring branch and the negative current measuring branch can be limited at the same time by connecting a sixth resistor R6 (not shown in the drawing) in series between the detecting coil and the current measuring branch, and the first resistor R1 and the third resistor R6 can be omitted.
Further, when the number of turns of the detection coil is sufficiently small and the voltage applied to the current detection branch is sufficiently small and the signal interference to the central control chip is negligible, the current detection branch according to the embodiment of the present invention may further include a second forward current detection branch as shown in fig. 5, the second forward current detection branch includes a first diode D1, a third switching element Q3 and a fifth resistor R5, an anode of the first diode D1 is connected to the first port a of the detection coil, a cathode of the first diode D1 is connected to an enabling terminal of the third switching element Q3 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the second port B of the detection coil, the second port B of the detection coil is grounded, a current input terminal of the electrical terminal of the first switching element Q3 is connected to the low voltage power supply, a current output terminal of the electrical terminal of the first switching element Q3 is grounded, a third output port I/O3 is led out between the current input terminal of the electrical terminal of the third switching element Q3 and the connection terminal of the low voltage power supply, when the first diode D3 is connected to the first port Q3, the first diode D3 is connected to the high voltage output terminal of the first switching element, the first switching element Q3 is connected to the high voltage output terminal, the first switching element is connected to the high voltage output level, the first switching element is connected to the first switching element Q3, the first switching element is connected to the second switching element Q3, and the first switching element is connected to the second switching element Q3, the second switching element is connected to the high voltage output terminal of the high voltage output terminal of the first switching element. It should be noted that, because the current detection branch in the embodiment of the present invention includes only the second positive current detection branch, the first period duration of positive conduction when the first output port I/O1 outputs a low level signal is t1, and the second period duration of negative conduction when the first output port I/O1 outputs a high level signal is t2.
It should be noted that the third switching element Q3 according to the embodiment of the present invention is an NPN-type transistor, and other switching tubes or PNP-type transistors may be selected according to needs. As can be seen from the NPN type transistor shown in fig. 5, the enable terminal of the third switching element Q3 is a base of the NPN type transistor, the current input terminal of the electrical terminal of the third switching element Q3 is a collector of the NPN type transistor, and the current output terminal of the electrical terminal of the third switching element Q3 is an emitter of the NPN type transistor.
The resonance booster circuit of the embodiment of the invention can detect the current direction and the change period information of the output current of the LC resonance circuit 101 during the circuit oscillation starting, so that the main control chip can adjust according to the frequency of the output current of the LC resonance circuit 101 to realize perfect oscillation starting. And the control signal can be adjusted in real time in the circuit operation process, so that the resonance booster circuit is in the optimal resonance state in real time.
In another aspect of the present invention, a method for controlling the resonant boost circuit is further provided, and as shown in fig. 6, the method for controlling the resonant boost circuit according to the embodiment of the present invention includes the following steps:
s1, acquiring current direction and change period information of alternating current of a primary side coil or a secondary side coil of the boosting transformer;
in the embodiment of the present invention, the information of the current direction and the variation period of the alternating current includes: a first period time t1 when the current of the alternating current is positive and a second period time t2 when the current of the alternating current is negative;
s2, judging whether the current direction change frequency of the alternating current output by the LC resonance circuit 101 is consistent with the resonance frequency or not according to the current direction of the alternating current and the change period information;
in the embodiment of the present invention, determining whether the current direction change frequency of the alternating current output by the LC resonant circuit 101 is consistent with the resonant frequency according to the current direction of the alternating current and the change period information includes: judging whether the first period time t1 is equal to a second period time t2 or not; if yes, judging whether the sum of the first period time t1 and the second period time t2 is equal to the resonance period of the LC resonance circuit 101; if the current direction change frequency of the alternating current output by the LC resonance circuit 101 is equal to the resonance frequency.
And S3, if the frequency of the alternating current output by the LC resonance circuit 101 is inconsistent with the frequency of the alternating current output by the LC resonance circuit 101, adjusting the control signal of the LC resonance circuit 101 to enable the frequency of the alternating current to meet the resonance frequency.
In the embodiment of the present invention, the duty ratio and/or the frequency of the PWM1 square wave signal and the PWM2 square wave signal are adjusted so that the frequency of the alternating current output from the LC resonant circuit 101 satisfies the resonant frequency.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Fig. 7 schematically illustrates a structural schematic diagram of a control apparatus of a resonant boost circuit according to an embodiment of the present invention, and as shown in fig. 7, the control apparatus of the resonant boost circuit according to the embodiment of the present invention includes an obtaining module 701, a determining module 702, and a control module 703, where:
an obtaining module 701, configured to obtain information of a current direction and a change period of an alternating current of a primary side coil or a secondary side coil of the step-up transformer;
a determining module 702, configured to determine whether a current direction change frequency of the ac power output by the LC resonant circuit is consistent with a resonant frequency according to the current direction of the ac power and the change period information;
and the control module 703 is configured to adjust the control signal of the LC resonant circuit to make the frequency of the alternating current output by the LC resonant circuit meet the resonant frequency if the two are not consistent.
For the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.
The above-described embodiments of the apparatus are merely illustrative, and 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 position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The invention provides a resonance booster circuit and a control method and a device thereof, which utilize a frequency detection circuit to detect the current direction and the change period information of alternating current of a primary side coil or a secondary side coil of a booster transformer, convert the current direction and the change period information of the alternating current into weak current signals and output the weak current signals to a main control chip, so that the main control chip adjusts the control signals of an LC resonance circuit according to the current direction and the change period information of the alternating current to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A resonance booster circuit is characterized by comprising an LC resonance circuit, a booster transformer and a frequency detection circuit,
the LC resonance circuit is connected with the primary side coil of the boosting transformer and converts direct current output by the direct current power supply into alternating current with preset frequency according to a control signal input by the main control chip;
the boosting transformer is used for boosting the alternating current output by the LC resonance circuit so as to provide a driving voltage for a load connected with a secondary side coil of the boosting transformer;
the frequency detection circuit is arranged on the primary side or the secondary side of the boosting transformer and used for detecting the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer and converting the current direction and the change period information of the alternating current into weak current signals to be output to the main control chip, so that the main control chip adjusts the control signals of the LC resonance circuit according to the current direction and the change period information of the alternating current to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
2. The resonance boosting circuit according to claim 1, wherein said frequency detection circuit comprises a detection coil and a current detection branch circuit connected in parallel with said detection coil, said detection coil is disposed on the primary side or the secondary side of said boosting transformer for sensing the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of said boosting transformer, said current detection branch circuit is used for converting the current direction and the change period information of the alternating current into a weak current signal and outputting the weak current signal to a main control chip.
3. The resonance voltage boosting circuit according to claim 2, wherein the current detection branch circuit includes a forward current detection branch circuit, the forward current detection branch circuit includes a first photocoupler, an input anode end of the first photocoupler is connected to a first port of the detection coil, an input cathode end is connected to a second port of the detection coil, an output collector end is connected to a low voltage power supply, an output emitter end is grounded, a first output port is drawn between the output collector end of the first photocoupler and a connection terminal of the low voltage power supply, when a voltage of the first port of the detection coil is higher than the second port, an output end of the first photocoupler is internally conducted, and the first output port outputs a low level signal.
4. The resonance voltage boosting circuit according to claim 2 or 3, wherein the current detection branch comprises a negative current detection branch, the negative current detection branch comprises a second photocoupler, an input anode end of the second photocoupler is connected to the second port of the detection coil, an input cathode end of the second photocoupler is connected to the first port of the detection coil, an output collector end of the second photocoupler is connected to the low-voltage power supply, an output emitter end of the second photocoupler is grounded, a second output port is led out between the output collector end of the second photocoupler and the connection terminal of the low-voltage power supply, when the voltage of the second port of the detection coil is higher than that of the first port, the output end of the second photocoupler is internally conducted, and the second output port outputs a low-level signal.
5. The resonant boost circuit of claim 3, wherein the forward current detection branch further comprises a first resistor connected between the input cathode terminal of the first photocoupler and the second port of the detection coil.
6. The resonant boost circuit of claim 3, wherein the forward current sensing branch further comprises a second resistor coupled between the output emitter terminal of the first optocoupler and ground.
7. The resonant boost circuit of claim 4, wherein the negative current detection branch further comprises a third resistor connected between the input cathode terminal of the second photo-coupler and the first port of the detection coil.
8. The resonant boost circuit of claim 4, wherein the negative current sense branch further comprises a fourth resistor coupled between the output emitter terminal of the second optocoupler and ground.
9. The resonant boost circuit of claim 1, wherein the LC resonant circuit comprises a first switch element, a second switch element, a first inductor, a second inductor, and a first capacitor, the positive electrode of the dc power supply is connected in series with the first inductor to the current input terminal of the electrical terminal of the first switch element and the first port of the primary side winding of the boost transformer, the negative electrode of the dc power supply is connected in series with the second inductor to the current output terminal of the electrical terminal of the second switch element and the second port of the primary side winding of the boost transformer, the current output terminal of the electrical terminal of the first switch element and the current input terminal of the electrical terminal of the second switch element are respectively connected to ground, the first capacitor is connected in parallel with the primary side winding of the boost transformer, and the main control chip controls the on/off time of the first switch element and the second switch element by respectively inputting PWM control signals to the enable terminal of the first switch element and the enable terminal of the second switch element, so as to control the LC resonant circuit to convert the dc power output by the dc power supply into ac power of the preset frequency.
10. The resonance booster circuit according to claim 2, wherein the current detection branch circuit includes a second forward current electrical detection branch circuit including a first diode, a third switching element, and a fifth resistor, an anode of the first diode is connected to the first port of the detection coil, a cathode of the first diode is connected to an enable terminal of the third switching element and one end of the fifth resistor, the other end of the fifth resistor is connected to the second port of the detection coil, the second port of the detection coil is grounded, a current input terminal of the electrical terminal of the third switching element is connected to the low-voltage power supply, a current output terminal of the electrical terminal of the third switching element is grounded, a third output port is drawn between the current input terminal of the electrical terminal of the third switching element and the connection terminal of the low-voltage power supply, when the voltage of the first port of the detection coil is higher than the second port, the first diode is turned on, the enable terminal of the third switching element is input at a high level, the electrical terminal of the third switching element is turned on, and the third output a low-level signal.
11. The resonance boosting circuit according to claim 4, wherein said frequency detection circuit includes a sixth resistor connected in series between said detection coil and said current detection branch.
12. A method of controlling a resonant boost circuit according to any one of claims 1 to 11, the method comprising:
acquiring the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer;
judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency or not according to the current direction of the alternating current and the change period information;
and if the frequency of the alternating current output by the LC resonance circuit is inconsistent with the frequency of the alternating current output by the LC resonance circuit, adjusting the control signal of the LC resonance circuit to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency.
13. The method of controlling a resonant boost circuit according to claim 12,
the current direction and change period information of the alternating current comprises: a first period duration when the current of the alternating current is in a positive direction and a second period duration when the current of the alternating current is in a negative direction;
the judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency according to the current direction and the change period information of the alternating current comprises the following steps:
judging whether the first period time length is equal to a second period time length;
if so, judging whether the sum of the first period time length and the second period time length is equal to the resonance period of the LC resonance circuit;
if the current direction change frequency of the alternating current output by the LC resonance circuit is equal to the resonance frequency, the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency.
14. A control apparatus for a resonant boost circuit as claimed in any one of claims 1 to 11, said apparatus comprising:
the acquisition module is used for acquiring the current direction and the change period information of the alternating current of the primary side coil or the secondary side coil of the boosting transformer;
the judging module is used for judging whether the current direction change frequency of the alternating current output by the LC resonance circuit is consistent with the resonance frequency or not according to the current direction of the alternating current and the change period information;
and the control module is used for adjusting the control signal of the LC resonance circuit to enable the frequency of the alternating current output by the LC resonance circuit to meet the resonance frequency if the alternating current is inconsistent with the alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210881109.5A CN115149834A (en) | 2022-07-26 | 2022-07-26 | Resonance booster circuit and control method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210881109.5A CN115149834A (en) | 2022-07-26 | 2022-07-26 | Resonance booster circuit and control method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115149834A true CN115149834A (en) | 2022-10-04 |
Family
ID=83413422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210881109.5A Pending CN115149834A (en) | 2022-07-26 | 2022-07-26 | Resonance booster circuit and control method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115149834A (en) |
-
2022
- 2022-07-26 CN CN202210881109.5A patent/CN115149834A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100420136C (en) | Switching-mode power supply | |
| US9054546B2 (en) | Primary-side and secondary-side full-bridge switching circuit controller for a magnetic coupling and contactless power transmission apparatus | |
| CN106341053B (en) | Flyback-based power conversion device | |
| CN104980050B (en) | System and method for switched-mode power supply | |
| CN107612336A (en) | Variable blanking frequency for resonance converter | |
| CN103715898B (en) | Feedback voltage sample circuit, feedback voltage blanking circuit and method | |
| CN103780095A (en) | Method and controller for determining a demagnetization zero current time for a switched mode power supply | |
| CN108988636A (en) | Idle oscillation for multi output power converter detects | |
| CN105915080A (en) | Control module with an estimator of an input electric quantity for a switching converter and method for controlling a switching converter | |
| KR100697805B1 (en) | Quasi Resonant Type Switching Power Supply and Quasi Resonant Type Switching Power Circuit Using the Same | |
| KR20050085453A (en) | Switching power supply circuit | |
| CN102150342A (en) | Uninterruptible power supply device | |
| CN104052290A (en) | Switching Power Converter With Secondary To Primary Messaging | |
| KR20210139305A (en) | Pseudo-resonant auto-tuning controller | |
| US20150171760A1 (en) | Power Supply Control Circuit, Power Supply Device and Electronic Apparatus | |
| CN109586580A (en) | Control circuit, controlled resonant converter and integrated circuit control chip | |
| CN108061580A (en) | The field circuit and electromagnetic flowmeter of electromagnetic flowmeter | |
| TW201902103A (en) | Power control device and power control system | |
| CN109873557A (en) | Power adapter with low-loss damper | |
| CN102386778A (en) | Dc-dc converter | |
| KR102143254B1 (en) | Pwm controlling apparatus for flyback converter | |
| CN107078634B (en) | Zero voltage switching detection device and method | |
| US11139741B2 (en) | Resonant flyback converter with capacitor coupled to ground | |
| CN115149834A (en) | Resonance booster circuit and control method and device thereof | |
| CN217769912U (en) | Resonant booster circuit |
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 |