CN117240074B - Induction heating power supply system and phase compensation circuit - Google Patents
Induction heating power supply system and phase compensation circuit Download PDFInfo
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- CN117240074B CN117240074B CN202311499214.3A CN202311499214A CN117240074B CN 117240074 B CN117240074 B CN 117240074B CN 202311499214 A CN202311499214 A CN 202311499214A CN 117240074 B CN117240074 B CN 117240074B
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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
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- 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 invention discloses an induction heating power supply system and a phase compensation circuit, wherein the compensation circuit comprises a current acquisition unit, a first-stage amplifying unit, a signal processing unit and a comparator unit; the current acquisition unit is used for acquiring an output current signal of the induction heating power supply system, the output end of the current acquisition unit is connected with the input end of the first-stage amplifying unit, the output end of the first-stage amplifying unit is connected with the input end of the signal processing unit and the negative input end of the comparator unit, the output end of the signal processing unit is connected with the positive input end of the comparator unit through the adjustable resistor R1, and the output end of the comparator unit is connected with the positive input end of the comparator unit and the phase-locked loop in the induction heating power supply system; the phase compensation is realized by adjusting the compensation phase angle through adjusting the size of the adjustable resistor R1. The invention can accurately compensate the phase of the current signal in a wider range (0-90 degrees) and compensate the load of the inverter bridge to an inductive working interval.
Description
Technical Field
The invention belongs to the technical field of phase compensation, and particularly relates to an induction heating power supply system and a phase compensation circuit.
Background
The power electronics industry often uses a frequency tracking technology, such as an induction heating power supply (for example, a metal smelting industry or an injection molding machine heating system), as the temperature of a load increases, metal melts, the natural frequency of the load also changes, and as the inductance value of the induction coil changes in the process of heating the metal by the induction heating coil, reactive power increases and active power decreases under fixed frequency to influence heating efficiency, and in order to ensure that the induction heating power supply works at a high power factor, a control circuit must have a frequency tracking function, namely a frequency tracking function. For example, in the field of resonance wireless charging of electric vehicles, the resonance frequency is generally 85KHz, and when the primary side coupling coil is misaligned, the coupling coefficient between the coils will change, so that the wireless charging output power and the primary side-to-secondary side conversion efficiency are reduced. In order to achieve accurate frequency tracking, a common solution is to use a CMOS phase-locked loop (e.g. a CMOS phase-locked loop integrated circuit with a chip model of CD 4046) to achieve frequency tracking, and phase compensation is necessary while achieving frequency tracking, specifically because:
(1) Usually, delays are inevitably introduced in the system, such as rising edge delays, IGBT (insulated gate bipolar transistor) turn-on delays and delays caused by passive devices in a main circuit, and delays caused by sampling sensors and conditioning circuits, and although the delays can be smaller (us level), phase angle delays caused by the delays are not negligible for a medium-high frequency (tens of KHz) system;
(2) To prevent the inverter from operating in the capacitive section, the inverter with capacitive load generally causes current spikes due to diode reverse recovery problems when switching between upper and lower legs of the bridge, and switching device losses increase. If the drive signal is used to replace the actual output voltage to participate in the phase comparison, and there is a delay between the drive signal and the actual output voltage (such as waveform a and waveform c in fig. 3), or there is a delay between the current sensor and the signal conditioning, the system will be caused to enter the capacitive operation region.
At present, a hall current sensor is generally adopted for sampling a current signal, a comparison circuit is added to obtain a square wave signal related to a current phase angle, and the square wave signal is input to a 14 pin of a CD4046, and the details of the method can be seen from the thesis of the Shuos: liu Xiao, resonant Medium frequency Induction heating Power supply [ D ], hunan university, 2009.04. Xiong Lasen and the like provide a phase compensation circuit (see, in particular, xiong Lasen, quan Yajie, application of a CD4046 phase-locked loop in an induction heating power supply [ J ]. Research and design-electric welding machine, 2000 (6): 14-19 ]), which adopts a half-wave rectification mode after a LEM sensor samples current, and finally outputs a square wave signal through comparison.
The two phase compensation modes have the following disadvantages:
(1) The price is high by adopting a current sensor; the sampling frequency of the general Hall current sensor is 100KHz at most, a certain delay exists, and in addition, a power supply is needed to be provided, so that the use is inconvenient;
(2) The half-wave rectification and filtering mode is adopted, so that the ripple wave is larger, and the precision is low;
(3) The circuit may jitter around the comparison value.
Disclosure of Invention
The invention aims to provide an induction heating power supply system and a phase compensation circuit, which are used for solving the problems of high price, certain time delay and inconvenient use caused by the current acquisition by adopting a current sensor in the traditional mode, low precision and possible jitter near a comparison value.
The invention solves the technical problems by the following technical scheme: a phase compensation circuit comprises a current acquisition unit, a first-stage amplifying unit, a signal processing unit and a comparator unit; the current acquisition unit is used for acquiring an output current signal of the induction heating power supply system, the output end of the current acquisition unit is connected with the input end of the first-stage amplification unit, the output end of the first-stage amplification unit is connected with the input end of the signal processing unit and the negative input end of the comparator unit, the output end of the signal processing unit is connected with the positive input end of the comparator unit through the adjustable resistor R1, and the output end of the comparator unit is connected with the positive input end of the comparator unit and the phase-locked loop in the induction heating power supply system; the phase compensation is realized by adjusting the compensation phase angle through adjusting the size of the adjustable resistor R1.
Further, the current acquisition unit comprises a first-stage current transformer and a second-stage current transformer, the primary side of the first-stage current transformer is arranged at the output end of the induction heating power supply system, the secondary side of the first-stage current transformer is connected with the primary side of the second-stage current transformer through an interface, and the secondary side of the second-stage current transformer is connected with the first-stage amplifying unit.
Further, the current ratio of the first-stage current transformer is designed according to the ratio of rated current of an induction heating power supply system to 5A, and the current ratio of the second-stage current transformer is 5:1.
Further, the signal processing unit comprises an absolute value unit, a filtering unit and a second-stage amplifying unit which are sequentially connected; the absolute value unit is used for converting the alternating voltage signal output by the first-stage amplifying unit into a positive voltage signal.
Further, the absolute value unit comprises a third amplifier and a fourth amplifier, wherein the negative input end of the third amplifier is connected with the output end of the first-stage amplifying unit through a resistor R6, the positive input end of the third amplifier is grounded through a resistor R7, the output end of the third amplifier is connected with the negative input end of the fourth amplifier through a diode D1 and a resistor R10 in sequence, the negative electrode of the diode D1 is connected with the negative input end of the third amplifier through a diode D2, and the positive electrode of the diode D1 is connected with the negative input end of the third amplifier through a resistor R8; the positive input end of the fourth amplifier is grounded through a resistor R12, the negative input end of the fourth amplifier is connected with the output end of the first-stage amplifying unit through a resistor R9, and the output end of the fourth amplifier is connected with the negative input end of the fourth amplifier through a resistor R11.
Further, the filtering unit is an RC filtering circuit.
Further, the second-stage amplifying unit comprises a second amplifier, the negative input end of the second amplifier is grounded through a resistor R14, the positive input end of the second amplifier is connected with the output end of the filtering unit through a resistor R13, and the output end of the second amplifier is connected with the negative input end of the second amplifier through a resistor R15.
Based on the same conception, the invention also provides an induction heating power supply system, which comprises a full-bridge rectifying circuit, a transformer, a phase-locked loop, an LC series resonant circuit and a phase compensation circuit as described above; the input end of the full-bridge rectifying circuit is connected with an external power supply, the output end of the full-bridge rectifying circuit is connected with the input end of the transformer, the output end of the transformer is connected with the LC series resonant circuit, the current acquisition unit of the phase compensation circuit is arranged at the output end of the LC series resonant circuit, and the output end of the phase-locked loop is connected with the control end of the switching device in the full-bridge rectifying circuit.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the phase compensation circuit provided by the invention comprises a current acquisition unit, a first-stage amplification unit, a signal processing unit and a comparator unit, wherein the output end of the first-stage amplification unit is connected to the negative input end of the comparator unit, the output end of the comparator unit is fed back to the positive input end of the comparator unit to form positive feedback, the positive feedback eliminates the problem of output waveform jitter when the values of the positive input end and the negative input end of the comparator unit are similar, and the jitter near the jump edge is prevented;
the voltage signal of the positive input end of the comparator unit can be adjusted from zero to the output waveform peak value of the first-stage amplifying unit by adjusting the size of the adjustable resistor R1, the phase shift angle of the collected output current signal is adjusted, and the current lead voltage or the current lag voltage is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a phase compensation circuit in an embodiment of the invention;
FIG. 2 is a schematic diagram of an induction heating power system in an embodiment of the invention;
FIG. 3 is a diagram of a CD4046 PLL circuit in accordance with an embodiment of the present invention;
FIG. 4 is a diagram of actual waveforms at various stages in an embodiment of the present invention;
FIG. 5 is a waveform of the output voltage and the output current when the resistance of the adjustable resistor R1 is adjusted to zero in the embodiment of the invention;
FIG. 6 is a graph showing waveforms of the output voltage and the output current when the resistance of the adjustable resistor R1 is adjusted to a unit power factor according to an embodiment of the present invention;
FIG. 7 is a waveform of the output voltage and the output current when the resistance of the adjustable resistor R1 is adjusted to 10kΩ according to an embodiment of the present invention;
fig. 8 is a plot of the frequency tracking effect of a CD4046 pll according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the present application is described in detail below with specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Aiming at a medium-high frequency power supply system (10 kHz-100 kHz), the invention designs a circuit capable of effectively solving the problem of phase compensation between output voltage and output current.
As shown in fig. 1, the phase compensation circuit provided by the embodiment of the invention comprises a current acquisition unit, a first-stage amplifying unit, a signal processing unit and a comparator unit; the current acquisition unit is used for acquiring an output current I0 signal of the induction heating power supply system, the output end of the current acquisition unit is connected with the input end of the first-stage amplification unit, the output end of the first-stage amplification unit is connected with the input end of the signal processing unit and the negative input end of the comparator unit, the output end of the signal processing unit is connected with the positive input end of the comparator unit through the adjustable resistor R1, and the output end of the comparator unit is connected with the positive input end of the comparator unit and the phase-locked loop in the induction heating power supply system; the phase compensation is realized by adjusting the compensation phase angle through adjusting the size of the adjustable resistor R1.
The current acquisition unit acquires the output current I0 of the induction heating power supply system, the output current flows through a resistor R2 at the output end of the current acquisition unit to generate a voltage signal, and the voltage signal is amplified by the first-stage amplifying unit and then divided into two paths: one path of the output waveform is rectified, filtered and amplified (1.57 times amplified in the embodiment) by the signal processing unit and then is input to the positive input end of the comparator unit through the adjustable resistor R1, the other path of the output waveform is connected to the negative input end of the comparator unit, the output end of the comparator unit is fed back to the positive input end of the comparator unit to form positive feedback, and the problem of output waveform jitter when the values of the positive input end and the negative input end of the comparator unit are similar can be solved due to the effect of the positive feedback. The signal of the positive input end (i.e. point D in fig. 1) of the second stage amplifying unit in the signal processing unit is an average value of the current signal, the signal of the output end (i.e. point E in fig. 1) of the second stage amplifying unit is a current peak value, the current peak value is equal to the average value of the current signal multiplied by the amplification factor of the second stage amplifying unit, the size of the adjustable resistor R1 is adjusted, the voltage signal of the positive input end (i.e. point B in fig. 1) of the comparator unit is changed from zero to the output waveform peak value (i.e. waveform peak value of point a in fig. 1) of the first stage amplifying unit, the phase shift angle of the collected output current I0 is adjusted, the current lead voltage or lag voltage is realized, and the phase shift angle is fixed independent of the current size.
In a specific embodiment of the present invention, the current collecting unit includes a first-stage current transformer and a second-stage current transformer U1, wherein a primary side of the first-stage current transformer is disposed at an output end (as shown in fig. 2) of the induction heating power system, a secondary side of the first-stage current transformer is connected to a primary side of the second-stage current transformer U1 through an interface, and a secondary side of the second-stage current transformer U1 is connected to the first-stage amplifying unit.
The invention uses the current transformer to collect the output current of the induction heating power system, and has low price compared with the current sensor; and adopt the two-stage current transformer, the first-stage current transformer locates the output of induction heating power supply system, can design its electrorheological ratio according to the rated current of induction heating power supply system and 5A's ratio, and the electrorheological ratio of second-stage current transformer U1 is set to 5:1, to different induction heating power supply systems, second-stage current transformer U1 remains unchanged, only need change first-stage current transformer can, the design of the mutual-inductor of being convenient for in different power supply system's application scenario.
In this embodiment, the magnetic cores of the first-stage current transformer and the second-stage current transformer U1 all adopt ferrite magnetic cores with high magnetic permeability, the second-stage current transformer U1 is arranged on the PCB board, the secondary side of the first-stage current transformer is designed according to the 5A current effective value, and the current ratio of the second-stage current transformer U1 is 5:1. For example, when the output current I0 of the induction heating power supply system is a rated current (designed as 600A), the current induced by the secondary side of the second-stage current transformer U1 is 1A, and after flowing through the resistor R2, a voltage signal of 1V (the voltage peak value is 1.414V) is generated, and the voltage signal is split into two paths after being amplified by twice the first-stage amplifying unit.
In a specific embodiment of the present invention, the first stage amplifying unit includes a first amplifier U2A, where a negative input end of the first amplifier U2A is connected to a secondary side of the second stage current transformer U1 through a resistor R3, a positive input end thereof is grounded through a resistor R4, and an output end thereof is fed back to a negative input end of the first amplifier U2A through a resistor R5. In this embodiment, the amplification factor of the first-stage amplification unit is 2.
In one specific embodiment of the present invention, the signal processing unit includes an absolute value unit, a filtering unit and a second-stage amplifying unit connected in sequence; the absolute value unit is used for converting the alternating voltage signal output by the first-stage amplifying unit into a positive voltage signal, namely rectifying the input alternating voltage signal.
In a specific embodiment of the present invention, the absolute value unit includes a third amplifier U2B and a fourth amplifier U3A, the negative input end of the third amplifier U2B is connected to the output end of the first stage amplifying unit through a resistor R6, the positive input end of the third amplifier U2B is grounded through a resistor R7, the output end of the third amplifier U2B is connected to the negative input end of the fourth amplifier U3A sequentially through a diode D1 and a resistor R10, the negative electrode of the diode D1 is connected to the negative input end of the third amplifier U2B through a diode D2, and the positive electrode of the diode D1 is connected to the negative input end of the third amplifier U2B through a resistor R8; the positive input end of the fourth amplifier U3A is grounded through a resistor R12, the negative input end of the fourth amplifier U3A is connected with the output end of the first-stage amplifying unit through a resistor R9, and the output end of the fourth amplifier U3A is connected with the negative input end of the fourth amplifier U3A through a resistor R11.
In this embodiment, the filter unit is an RC filter circuit composed of a resistor R13 and a capacitor C1.
In this embodiment, the second-stage amplifying unit includes a second amplifier U3B, where a negative input end of the second amplifier U3B is grounded through a resistor R14, a positive input end of the second amplifier U3B is connected to an output end of the filtering unit through a resistor R13, and an output end of the second amplifier U3B is connected to a negative input end of the second amplifier U3B through a resistor R15. The amplification factor of the second stage amplifying unit is 1.57, i.e. the output signal of the second amplifier U3B is equal to the forward input signal x 1.57 of the second amplifier U3B.
In a specific embodiment of the present invention, the comparator unit includes a comparator U4, a negative input end of the comparator U4 is connected to an output end of the first stage amplifying unit, a positive input end of the comparator U4 is grounded through a resistor R18, a positive input end of the comparator U4 is also connected to an output end of the second stage amplifying unit through an adjustable resistor R1, an output end of the comparator U4 is fed back to the positive input end thereof through a resistor R16, and an output end (i.e., a point C in fig. 1) of the comparator U4 is connected to a phase-locked loop in the induction heating power system. In this embodiment, the model of the pll is CD4046, and the output terminal of the comparator U4 is connected to pin 14 of the pll.
As shown in fig. 2, the embodiment of the present invention further provides an induction heating power supply system, which includes a full-bridge rectifier circuit, a transformer T, a phase-locked loop, an LC series resonant circuit (formed by connecting a capacitor C2 and an inductor Lr in series), and a phase compensation circuit as described above; the input end of the full-bridge rectifying circuit is connected with an external power supply, the output end of the full-bridge rectifying circuit is connected with the input end of a transformer T, the output end of the transformer T is connected with an LC series resonant circuit, a first-stage current transformer of the phase compensation circuit is arranged at the output end of the LC series resonant circuit and is used for collecting output current I0, the output end of the phase-locked loop is connected with the control ends of switching devices S1-S4 in the full-bridge rectifying circuit, and a driving signal output by the phase-locked loop controls the switching devices S1-S4 in the full-bridge rectifying circuit to be turned on or off.
As shown in fig. 3, the present embodiment uses a phase-locked loop with model CD4046 to perform phase locking, and the phase-locked loop is characterized in that: the duty ratio of the output signal is always 50%, the input signal is irrelevant to the duty ratio and is only relevant to the rising edge, the 3 pin and the 4 pin of the CD4046 phase-locked loop are connected together, and the driving signal output by the CD4046 phase-locked loop replaces the actual output voltage V0 to participate in the current phase angle comparison. In this embodiment, the adjustment range of the adjustable resistor R1 is 0-10 kΩ, the smaller the resistance, the larger the compensated phase angle, when the resistance of the adjustable resistor R1 is adjusted to 0Ω, the phase angle of the voltage lead current is the largest, and the maximum lead phase angle is 90 °; when the resistance of the adjustable resistor R1 is adjusted to a maximum value (i.e., 10kΩ), the compensated phase angle is minimum, and the minimum compensated phase angle can compensate the delay between the driving signal output by the CD4046 phase-locked loop and the actual output voltage V0, so as to prevent the full-bridge rectifier circuit in fig. 2 from operating in the capacitive operation region.
Fig. 4 shows actual waveforms at different stages, where waveform a is the output voltage V0 waveform of the transformer T; waveform b is the waveform of the output current I0 after passing through the LC series resonant circuit; waveform c is the drive signal waveform output by the CD4046 phase-locked loop; the waveform d is the waveform of the positive input end and the negative input end of the comparator U4, the waveform d comprises two waveforms, a straight line in the waveform d is the waveform of the positive input end of the comparator U4 (namely the waveform of the point B in fig. 1), and a positive chord line in the waveform d is the waveform of the output end of the first-stage amplifying unit (namely the waveform of the point A in fig. 1); waveform e is the waveform at the output of comparator U4 (i.e., the waveform at point C in fig. 1). A delay exists between the waveform a and the waveform c, which represents the total delay between the driving signal output by the CD4046 phase-locked loop and the actual output voltage V0; the rising edge of waveform e is just aligned with waveform c, indicating that the rising edges of the signals of pins 3 and 14 of the CD4046 phase-locked loop are aligned after the CD4046 phase-locked loop is adjusted; when waveform e transitions from a low to a high, the output is fed back to the positive input of comparator U4, which will continue to increase in voltage by about 5mv, which will help prevent the occurrence of repetitive jitter when the positive and negative input signals of comparator U4 are close.
Fig. 5 to 7 show waveforms of the output voltage V0 and the output current I0 of different resistance values of the adjustable resistor R1 at the time of experiments. As shown in fig. 5, when the resistance value of the adjustable resistor R1 is adjusted to 0 ohm, the voltage leads the current, which is an inductive system, theoretically, when the resistance value of the adjustable resistor R1 is adjusted to 0 ohm, the voltage should lead the current by 90 °, and since the average value of the current signal is not 1.57 times the amplification factor of the current peak value, the voltage in fig. 5 does not lead the current by 90 °; as shown in fig. 7, when the resistance of the adjustable resistor R1 is adjusted to 10k ohms, the voltage lags the current, and is a capacitive system. It can also be seen from fig. 5 to 7 that when the resistance value of the adjustable resistor R1 is adjusted, the system frequency is unchanged, and only the phases of the output voltage V0 and the output current I0 are affected.
Fig. 8 shows a plot of the tracking effect of the CD4046 phase-locked loop, wherein the square wave with smaller amplitude is the driving signal waveform outputted by the CD4046 phase-locked loop, and is also the input waveform of 3 pins, the square wave with larger amplitude is the input waveform of 14 pins, as can be seen from fig. 8, the duty cycle of the driving signal waveform outputted by the CD4046 phase-locked loop is 50%, the duty cycle of the output waveform of the comparator U4 is greater than 50%, the waveforms in fig. 4 are consistent, and the input waveform of 3 pins is synchronous with the rising edge of the input waveform of 14 pins, which indicates that the CD4046 phase-locked loop has successfully tracked, and it can be seen from the input waveform of 14 pins in fig. 8 that the rising edge and the falling edge of the output waveform of the comparator U4 change rapidly and without jitter.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.
Claims (6)
1. A phase compensation circuit, characterized by: the compensation circuit comprises a current acquisition unit, a first-stage amplifying unit, a signal processing unit and a comparator unit; the current acquisition unit is used for acquiring an output current signal of the induction heating power supply system, the output end of the current acquisition unit is connected with the input end of the first-stage amplification unit, the output end of the first-stage amplification unit is connected with the input end of the signal processing unit and the negative input end of the comparator unit, the output end of the signal processing unit is connected with the positive input end of the comparator unit through the adjustable resistor R1, and the output end of the comparator unit is connected with the positive input end of the comparator unit and the phase-locked loop in the induction heating power supply system; the phase compensation is realized by adjusting the compensation phase angle through adjusting the size of the adjustable resistor R1;
the signal processing unit comprises an absolute value unit, a filtering unit and a second-stage amplifying unit which are sequentially connected; the absolute value unit is used for converting the alternating voltage signal output by the first-stage amplifying unit into a positive voltage signal; the absolute value unit comprises a third amplifier and a fourth amplifier, wherein the negative input end of the third amplifier is connected with the output end of the first-stage amplifying unit through a resistor R6, the positive input end of the third amplifier is grounded through a resistor R7, the output end of the third amplifier is connected with the negative input end of the fourth amplifier through a diode D1 and a resistor R10 in sequence, the negative electrode of the diode D1 is connected with the negative input end of the third amplifier through a diode D2, and the positive electrode of the diode D1 is connected with the negative input end of the third amplifier through a resistor R8; the positive input end of the fourth amplifier is grounded through a resistor R12, the negative input end of the fourth amplifier is connected with the output end of the first-stage amplifying unit through a resistor R9, and the output end of the fourth amplifier is connected with the negative input end of the fourth amplifier through a resistor R11.
2. The phase compensation circuit of claim 1, wherein: the current acquisition unit comprises a first-stage current transformer and a second-stage current transformer, the primary side of the first-stage current transformer is arranged at the output end of the induction heating power supply system, the secondary side of the first-stage current transformer is connected with the primary side of the second-stage current transformer through an interface, and the secondary side of the second-stage current transformer is connected with the first-stage amplifying unit.
3. The phase compensation circuit of claim 2, wherein: the current ratio of the first-stage current transformer is designed according to the ratio of rated current of an induction heating power supply system to 5A, and the current ratio of the second-stage current transformer is 5:1.
4. The phase compensation circuit of claim 1, wherein: the filtering unit is an RC filtering circuit.
5. The phase compensation circuit of claim 1, wherein: the second-stage amplifying unit comprises a second amplifier, the negative input end of the second amplifier is grounded through a resistor R14, the positive input end of the second amplifier is connected with the output end of the filtering unit through a resistor R13, and the output end of the second amplifier is connected with the negative input end of the second amplifier through a resistor R15.
6. An induction heating power supply system, characterized in that the power supply system comprises a full-bridge rectifier circuit, a transformer, a phase-locked loop, an LC series resonant circuit and a phase compensation circuit according to any one of claims 1 to 5; the input end of the full-bridge rectifying circuit is connected with an external power supply, the output end of the full-bridge rectifying circuit is connected with the input end of the transformer, the output end of the transformer is connected with the LC series resonant circuit, the current acquisition unit of the phase compensation circuit is arranged at the output end of the LC series resonant circuit, and the output end of the phase-locked loop is connected with the control end of the switching device in the full-bridge rectifying circuit.
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| CN202311499214.3A CN117240074B (en) | 2023-11-13 | 2023-11-13 | Induction heating power supply system and phase compensation circuit |
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| CN202311499214.3A CN117240074B (en) | 2023-11-13 | 2023-11-13 | Induction heating power supply system and phase compensation circuit |
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| CN117240074B true CN117240074B (en) | 2024-01-30 |
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| CN202311499214.3A Active CN117240074B (en) | 2023-11-13 | 2023-11-13 | Induction heating power supply system and phase compensation circuit |
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| US11392153B2 (en) * | 2020-02-06 | 2022-07-19 | Infineon Technologies Austria Ag | Power converter implementations, programmable gain, and programmable compensation |
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| US4605890A (en) * | 1985-06-24 | 1986-08-12 | Vernitron Corporation | Synchro power amplifier and control circuit for automatically tuning an inductive load |
| CN101212140A (en) * | 2006-12-29 | 2008-07-02 | 鸿富锦精密工业（深圳）有限公司 | Automatic power factor compensator |
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| CN117240074A (en) | 2023-12-15 |
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