CN217769912U - Resonant booster circuit - Google Patents
Resonant booster circuit Download PDFInfo
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- CN217769912U CN217769912U CN202221928740.8U CN202221928740U CN217769912U CN 217769912 U CN217769912 U CN 217769912U CN 202221928740 U CN202221928740 U CN 202221928740U CN 217769912 U CN217769912 U CN 217769912U
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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 utility model provides a resonance booster circuit, resonance booster circuit includes LC resonance circuit, step up transformer and frequency detection circuit, and LC resonance circuit connects in step up transformer primary side coil, converts the direct current into the alternating current of presetting the frequency according to the control signal of main control chip input; 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 can adjust 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 utility model provides a great problem of resonance state and frequency detection error, the method is simple, and lossless, the error is little and the security is high.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, especially, relate to a resonance boost circuit.
Background
In the current electronic circuit technology field, the inversion of a low voltage dc voltage into a high voltage ac using the LC resonance principle 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 the 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 complex; 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 bar 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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of resonance boost circuit to solve the resonance state observation that mentions in the background art and adjust means operation complicacy, the error is big and there is the problem of potential safety hazard.
In order to achieve the above object, the utility model discloses a concrete technical scheme of resonance boost circuit as follows:
one aspect of the present invention provides a resonant booster 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 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 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 road includes forward current detection branch road, forward current detection branch road includes first photoelectric coupler, first photoelectric coupler's input anode end connect in the first port of detection coil, input cathode end connect in the second port of detection coil, output collector end connects in the low voltage power, and output emitter end is ground connection first output port is drawn forth between first photoelectric coupler's output collector end and the connecting terminal of low voltage power, works as when the voltage of the first port of detection coil is higher than the second port, first photoelectric coupler's output inside switches 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 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 of the preset frequency.
Further, the current detection branch circuit comprises a second forward current detection branch circuit, the second forward current detection branch circuit comprises a first diode, a third switch element and a fifth resistor, the anode of the first diode is connected with the first port of the detection coil, the cathode of the first diode is connected with the enabling end of the third switch element and one end of the fifth resistor, the other end of the fifth resistor is connected with 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 switch element is connected with the low-voltage power supply, the current output end of the electrical terminal of the third switch element is grounded, a third output port is led out between the current input end of the electrical terminal of the third switch element and the connecting terminal of the low-voltage power supply, when the voltage of the first port of the detection coil is higher than that of the second port, the first diode is conducted, the enabling end of the third switch element inputs a high level, the electrical terminal of the third switch element is conducted, 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.
The utility model provides a pair of resonance boost circuit utilizes frequency detection circuit to detect the current direction and the change period information of the alternating current of step up transformer primary side coil or secondary side coil to change the current direction of alternating current and change period information and change light current signal output and give main control chip, adjust for main control chip according to the current direction and the change period information of alternating current LC resonance circuit's control signal so that the frequency of the alternating current of LC resonance circuit output with satisfy the resonance frequency, the utility model provides a great problem of resonant condition and frequency detection error, detection method is simple, and is lossless, and the error is little and the security is high, and resonant condition adjusts easy operation moreover.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
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 according to 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 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.
Utility model figure mark explains:
101. an LC resonance circuit; 102. a load; 103. a frequency detection circuit.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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", and the like indicate orientations or positional relationships based on 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 schematically shows a structural 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, the LC resonant circuit 101 is connected to the primary side coil of the boost transformer T1, and converts the dc power output by the dc power supply into ac power with a preset frequency according to the control signal input by the 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 resonance 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 resonance circuit satisfies a resonance frequency.
It should be noted that, the embodiment of the present invention provides a main control chip for controlling the normal operation of the resonant boost circuit, which controls the on/off of the switch element of the LC resonant circuit 101 through outputting the 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. The embodiment of the utility model provides an in, the weak current signal of frequency detection circuit 103 output can directly transmit for main control chip, also can transmit earlier for exclusive receiving chip, processes the back through receiving chip and then transmits for main control chip, and this the utility model discloses do not prescribe a limit.
Further, 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 T1, 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. Also can set up corresponding number of turns according to the thread engineering needs, to this the utility model discloses do not restrict.
For a clearer description of 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, the utility model discloses the first switch element Q1 of LC resonant circuit, second switch element Q2, first inductance L1, second inductance L2 and first electric capacity C, the utility model discloses the switch element of the embodiment of the utility model discloses the switch element of the accompanying drawing is the MOS pipe, also can select the switch element that has corresponding switching performance according to the demand, compares the utility model discloses do not do the restriction, the LC resonant circuit who gives in the following use in fig. 2 explains 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 source 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 source charges the first capacitor C through the first inductor L2, and the first capacitor C and the primary side coil of the step-up transformer T1 are connected in parallel and perform a charge and discharge cycle with each other to generate a 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 source into ac with a preset frequency, as shown in fig. 3, a waveform diagram of the ac 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 embodiment of the present invention monitors the frequency of the alternating current output from the LC resonant circuit 101 in real time by setting the frequency detection circuit 103, so that the main control chip adjusts the duty ratio and/or frequency of the control signal of the LC resonant circuit 101, i.e. the duty ratio and frequency of PWM1 and PWM2, according to the current direction and the change period information of the alternating current output from the LC resonant circuit 101, so that the frequency of the alternating current output from the LC resonant circuit 101 satisfies 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 configured to sense 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 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.
Further, the current detection branch circuit comprises a forward current detection branch circuit, the forward current detection branch circuit comprises a first photoelectric coupler U1, an input anode end of the first photoelectric coupler U1 is connected with a first port A of the detection coil, an input cathode end of the first photoelectric coupler U1 is connected with a second port B of the detection coil, an output collector end of the first photoelectric coupler U1 is connected with a 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 the 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 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.
Furthermore, the utility model discloses the current detection branch road can include one or two kinds of positive current detection branch road and negative current detection branch road, specifically can be according to the control progress settlement. In the above embodiment, 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 may be considered as a positive direction, and when the second output port I/O1 outputs a low level signal, the direction of the alternating current output by the LC resonance circuit 101 may be considered as a negative direction. 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 embodiment of the present invention provides a current detection branch circuit only includes a positive current detection branch circuit or only includes a negative current electrical detection branch circuit, to only include a positive current detection branch circuit as an example, it is long t1 to be regarded as the first period that positive direction switched on when first output port I/O1 outputs low level signal, and it is long t2 to be regarded as the second period that negative direction switched on when first output port I/O1 outputs high level signal.
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 series in each branch circuit to limit the circuit and avoid the damage of the current to each power device. 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 end 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 small enough and the voltage borne by the current detection branch is small enough, and the signal interference to the central control chip can be ignored, the current detection branch circuit of the embodiment of the present invention can further include a second forward current detection branch circuit as shown in fig. 5, the second forward current detection branch comprises 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 enable terminal of the third switching element Q3 and one terminal 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, the current input end of the electrical terminal of the third switching element Q3 is connected to the low-voltage power supply, the current output end of the electrical terminal of the third switching element Q3 is grounded, a third output port I/O3 is drawn between the current input terminal of the electric terminal of the third switching element Q3 and the connection 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 first diode D1 is conducted, the enabling end of the third switching element Q3 inputs high level, the electrical terminal of the third switching element Q3 is turned on, the third output port I/O3 outputs a low level signal, when the voltage of the second port B of the detection coil is higher than the first port, the first diode D1 is turned off, the enable terminal of the third switching element Q3 inputs a low level, the electrical terminal of the third switching element Q3 is disconnected, and the third output port I/O3 outputs a high level signal. It should be noted that, because the current detection branch circuit in the embodiment of the present invention only includes the second forward current detection branch circuit, therefore the first period that switches on as the forward direction when outputting the low level signal with the first output port I/O1 is long as t1, and the second period that switches on as the negative direction when outputting the high level signal with the first output port I/O1 is long as 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 as needed. 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 utility model discloses resonance boost circuit not only can make the current direction to LC resonance circuit 101's output current and change periodic information and detect at the circuit oscillation starting to main control chip adjusts according to LC resonance circuit 101's output current's frequency, with the realization 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.
Utility model discloses to above-mentioned resonance boost circuit's control method utility model includes following step:
s1, acquiring the current direction and the change period information of alternating current of a primary side coil or a secondary side coil of the boosting transformer;
the embodiment of the present invention provides an in, the current direction and the change cycle information of alternating current include: 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;
the embodiment of the present invention provides an in, according to the current direction and the change cycle information judgement of alternating current whether the current direction change frequency of the alternating current of LC resonant circuit 101 output is unanimous with resonant frequency includes: judging whether the first period time t1 is equal to a second period time t2; 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, adjusting the control signal of the LC resonance circuit 101 to enable the frequency of the alternating current output by the LC resonance circuit 101 to meet the resonance frequency.
In the embodiment of the present invention, the frequency of the alternating current output from the LC resonant circuit 101 satisfies the resonant frequency by adjusting the duty ratio and/or the frequency of the PWM1 square wave signal and the PWM2 square wave signal.
The utility model discloses the utility model provides a pair of resonance boost circuit utilizes the current direction and the change period information of frequency detection circuit detection boost transformer primary side coil or secondary side coil's alternating current to change the current direction of alternating current and change period information and change light current signal output and give main control chip, adjust according to the current direction and the change period information of alternating current with the main control chip the control signal of LC resonance circuit so that the frequency of the alternating current of LC resonance circuit output with satisfy the harmonic oscillation frequency, the utility model provides a great problem of resonance state and frequency detection error, detection method is simple, and is lossless, and the error is little and the security is high, and resonance state adjusts easy operation moreover.
Those skilled in the art will appreciate that although some embodiments herein include some features included in other embodiments instead of 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 embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (11)
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 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 the 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 at 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 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 a 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 sense 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 sensing 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 terminal 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 boost transformer, the negative terminal 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 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 grounded, the first capacitor is connected in parallel with the primary side coil 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 a PWM control signal 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 at a predetermined frequency.
10. The resonance booster circuit according to claim 2, wherein the current detection branch circuit includes a second forward current 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 first 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221928740.8U CN217769912U (en) | 2022-07-26 | 2022-07-26 | Resonant booster circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221928740.8U CN217769912U (en) | 2022-07-26 | 2022-07-26 | Resonant booster circuit |
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| CN217769912U true CN217769912U (en) | 2022-11-08 |
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