Thick film hybrid integrated power system based on planar magnetic integration technology

Abstract

The present invention discloses a thick film hybrid integrated power supply system based on planar magnetic integration technology, comprising: a thick film hybrid integrated DC / DC converter, a planar magnetic integrated module and an auxiliary power supply module; the primary and secondary circuits of the thick film hybrid integrated DC / DC converter transfer energy through a transformer composed of primary and secondary windings in the planar magnetic integrated module, and the output voltage is obtained through a filter circuit after passing through a synchronous rectifier in the secondary circuit, so that the power supply can be stabilized, thereby reducing the loss of the primary and auxiliary power supply circuits.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronic converters, and more specifically, relates to a thick film hybrid integrated power supply system based on planar magnetic integration technology. Background Art

[0002] As the core basic component of aerospace equipment, the power supply is mainly responsible for the power supply task of the functional subsystems such as the control and power of the equipment, and is the prerequisite for ensuring the stable operation of aerospace equipment. Therefore, the aerospace industry has always had high requirements for the operating temperature and quality level of power supply products. Compared with the common power modules using PCB printing technology, the thick film hybrid integrated power supply has the advantages of high integration, high power density, high reliability and wide operating temperature range due to its special process technology. It is widely used in high-tech equipment such as satellites, aircraft, rockets, missiles, radars, etc. to achieve high reliability and high quality power supply. From the perspective of performance, the thick film hybrid integrated power supply will develop in the direction of miniaturization, intelligence, multi-function, high integration and high reliability; from the perspective of application, it will develop in the direction of high frequency, high power, high precision and multi-function integration.

[0003] At present, the United States has the most advanced technology in the research of thick film hybrid integrated power supply technology in the world. Among them, Interpoint, VPT, Infineon (IR) and other companies mainly produce high-reliability thick film hybrid integrated power supply series products. The products have been pedigree, serialized and standardized, and the highest quality level can reach aerospace grade. At this stage, China has a certain hybrid integrated circuit research and development technology foundation, which can replace some foreign power modules. For example, for the 50W module power supply in the small thick film DC / DC converter, it can replace the DVHE2805S product of VPT Company in the United States and achieve complete localization. The high reliability, small size, light weight and long service life of this product can meet the application requirements of various military electronic systems. In addition to replacing some power modules, China is also conducting independent research and development of thick film hybrid integrated power supplies of different power levels. However, in some high-reliability applications, the aerospace-grade hybrid integrated power supply used still needs to be imported from abroad. The main reason for this phenomenon is that the performance of key components and chips cannot meet the foreign performance standards due to the use of domestically produced power products, which is reflected in low efficiency, poor anti-electromagnetic interference ability, high noise, and poor device reliability, making it difficult to achieve the performance indicators of foreign products. Taking the 50W module power supply that replaces the DVHE2805S product of VPT as an example, the efficiency gap is the most obvious among all indicators. Its highest efficiency is only 88%, while the efficiency indicator of foreign products is up to 90%. Except for the efficiency indicator, the other indicators are almost the same as those of foreign products. Although the United States has always maintained a leading position in this technology field, it has not been able to break through the problem of low efficiency of thick-film hybrid integrated power supplies.

[0004] To address the problem of low efficiency of thick-film hybrid integrated power supplies, the more common technical solutions are: applying efficient power electronic topologies and control methods. The research in this area is relatively complete and mature, and the introduction of new topologies and control technologies requires a lot of time to verify their reliability. Or applying new semiconductor devices, which are still in the verification stage due to their high quality factor and price issues, and require additional drive circuit design, which will reduce the overall power density. Or developing high-performance power management chips and driver chips to reduce the losses generated in the control process, but due to foreign technology blockades, the chip development cycle will be unpredictable and it will be difficult to achieve mass production in the short term. Or improving the winding structure of magnetic devices to reduce AC losses, but the manual winding method has greater instability, which reduces the overall reliability of the power supply.

[0005] The loss of the power module is mainly distributed in the switch tube and the magnetic device. The loss of the magnetic device accounts for about one-third of the total loss, and the volume accounts for almost one-third of the total volume. Therefore, optimizing the design of the magnetic devices in the thick-film hybrid integrated power supply can improve the efficiency and the overall power density of the power supply. The research on planar magnetic integration technology in the power module of PCB printing process is relatively mature and has also shown good performance advantages, but the related technology is rarely studied in thick-film hybrid integrated power modules. Therefore, there is an urgent need for an efficient thick-film hybrid integrated power system that uses planar magnetic integration technology to improve the efficiency of magnetic components. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a thick-film hybrid integrated power system based on planar magnetic integration technology. The planar magnetic integration module can reduce the winding loss and volume size of the magnetic device, and adding a coupling winding therein can reduce the loss of the auxiliary power supply module, thereby improving the overall efficiency and power density of the thick-film hybrid integrated power system.

[0007] To achieve the above-mentioned invention object, the present invention proposes a thick film hybrid integrated power system based on planar magnetic integration technology, characterized in that it comprises: a thick film hybrid integrated DC / DC converter, a planar magnetic integration module and an auxiliary power supply module;

[0008] The thick film hybrid integrated DC / DC converter is a thick film forward synchronous rectifier converter, which mainly includes a primary circuit and a secondary circuit. The primary circuit and the secondary circuit transfer energy through a transformer composed of primary and secondary windings in a planar magnetic integrated module.

[0009] Among them, the primary circuit of the thick film hybrid integrated DC / DC converter and the primary winding N in the planar magnetic integrated module Pconnected, responsible for transferring grid energy to the secondary circuit; the secondary circuit is connected to the secondary winding N in the planar magnetic integrated module S And filter inductor winding N L Phase connection, primary winding N P and the secondary winding N S The transformer is composed of a secondary winding N S Responsible for the primary winding N P The voltage on the secondary circuit is converted into the voltage required by the secondary circuit, and then passes through the synchronous rectifier in the secondary circuit and then through the filter inductor winding N L The output voltage is obtained after the LC filter circuit composed of the capacitor and the

[0010] The planar magnetic integrated module comprises: a magnetic core, a primary winding N P and the secondary winding N S , filter inductor winding N L and auxiliary power supply winding N F ; Wherein, the magnetic core structure is a three-magnetic column type, specifically including a first magnetic column, a second magnetic column, a third magnetic column, a first opening, a second opening and an air gap;

[0011] Primary winding N P and the secondary winding N S Both are wound around the first magnetic column of the magnetic core. When winding, the primary winding N P and the secondary winding N S Bypass the outside of the core and the first opening, the primary winding N P The same-name end and opposite-name end of the planar magnetic integrated module are ports A and B, and the secondary winding N S The opposite end is port C of the module;

[0012] Filter inductor winding N L and auxiliary power supply winding N F Wound around the third magnetic column of the magnetic core, the filter inductor winding N L and auxiliary power supply winding N F Bypassing the second opening and the outside of the magnetic core, the two windings are coupled to each other; after winding, the filter inductor winding N L The same-name end is the port D of the planar magnetic integrated module, and its opposite-name end is connected to the secondary winding N S The same-named ends are connected together as port E of the planar magnetic integrated module, and the auxiliary power supply winding N F The same-name terminal and opposite-name terminal of are F and H of the planar magnetic integrated module respectively;

[0013] The auxiliary power supply module includes a power supply circuit during startup and a power supply circuit during stability;

[0014] The power supply circuit at startup is an electronic filter, which specifically includes: a DC power supply, an NPN transistor, a resistor R1, a voltage regulator Z1, capacitors C2 and C3, and a diode D1; the positive electrode of the DC input power supply is connected to the collector of the NPN transistor and one end of the resistor R1; the second end of the resistor R1 is connected to the base of the NPN transistor, the first end of the capacitor C2, and the cathode of the voltage regulator Z1; the emitter of the NPN transistor is connected to the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C3 and the power supply end of the MOSFET isolation driver chip; the negative electrode of the DC input power supply is connected to the capacitors C2, C3, and the anode of the voltage regulator Z1;

[0015] The stable power supply circuit includes: Schottky diode D2 and auxiliary power supply winding N F ; Auxiliary power supply winding N F The same-name end is connected to the anode of the diode D2, and the opposite-name end is connected to the second end of the capacitor C3; the cathode of the diode D2 is connected to the power supply end of the MOSFET isolation driver chip, the cathode of the diode D1 and the first end of the capacitor C3.

[0016] When the thick film hybrid integrated DC / DC converter starts, the filter inductor winding N L The voltage has not been established yet, and the power supply of the chip is provided by the electronic filter part. At this time, after the input voltage is clamped at a certain voltage value by the voltage regulator Z1, a voltage drop is generated through the NPN transistor and the diode D1, and finally the power supply voltage is formed; when the power supply is running in a steady state, the filter inductor winding N L The upper voltage is stable, the auxiliary power supply winding N F With inductor winding N L The inductive voltage is generated due to the coupling effect, and the induced voltage provides an auxiliary power supply voltage after generating a voltage drop through the Schottky diode D2. At this time, the electronic filter is in a non-working state.

[0017] The object of the invention of the present invention is achieved in this way:

[0018] The thick film hybrid integrated power supply system based on planar magnetic integration technology of the present invention comprises: a thick film hybrid integrated DC / DC converter, a planar magnetic integrated module and an auxiliary power supply module; the primary and secondary circuits of the thick film hybrid integrated DC / DC converter transfer energy through a transformer composed of primary and secondary windings in the planar magnetic integrated module, and the output voltage is obtained through a filter circuit after passing through a synchronous rectifier in the secondary circuit, so that the power supply can be stabilized, thereby reducing the loss of the primary auxiliary power supply circuit.

[0019] At the same time, the thick film hybrid integrated power system based on planar magnetic integration technology of the present invention also has the following beneficial effects:

[0020] (1) Through the design of this auxiliary power supply module, the conduction loss of the NPN transistor can be reduced when the power supply is running stably, and the power supply at this time is mainly obtained by induction on the inductor side, so fewer devices are used, which has almost no impact on the overall power density, but improves the efficiency of the overall power supply system;

[0021] (2) By opening an air gap in the planar magnetic integrated module and adopting a forward-coupled integration method, the output current ripple of the overall power supply system can be reduced by utilizing the principle of magnetic flux superposition;

[0022] (3) By setting the arrangement structure of the primary and secondary windings in the planar magnetic integrated module to a completely staggered winding method, using PCB routing to achieve it, and increasing the facing area of ​​the primary and secondary PCB windings, the coupling coefficient between the two windings can be increased, the leakage inductance can be reduced, and the AC loss caused by the skin effect and proximity effect can be reduced;

[0023] (4) By setting the connection point of the PCB winding in the planar magnetic integrated module as a half hole, the circuit can be connected more flexibly and the volume occupied by the device can be reduced;

[0024] (5) By using copper foil to vertically wind the filter inductor winding in the planar magnetic integrated module, the water vapor content of the overall power supply can be reduced, the reliability can be increased, and the volume occupied by the device can be reduced.

[0025] (6) The present invention improves the efficiency and power density of the thick film hybrid integrated power supply system by combining planar magnetic integration technology with thick film hybrid integrated DC / DC converter.

[0026] (7) The present invention adds an auxiliary power supply winding, which generates an induced voltage by coupling with the filter inductor winding, and is powered by it during stable operation, thereby reducing the loss of the original auxiliary power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a thick film hybrid integrated power system architecture diagram based on planar magnetic integration technology of the present invention;

[0028] Figure 2 It is a schematic diagram of the front structure of the magnetic core and winding;

[0029] Figure 3 It is a top view structural diagram of the magnetic core and winding;

[0030] Figure 4 It is the parameter design flow chart of planar magnetic integrated module;

[0031] Figure 5 This is the circuit diagram of the auxiliary power supply module. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is described below in conjunction with the accompanying drawings so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when the detailed description of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0033] Example

[0034] In this embodiment, if Figure 1 As shown, the present invention is a thick film hybrid integrated power system based on planar magnetic integration technology, comprising: a thick film hybrid integrated DC / DC converter, a planar magnetic integration module and an auxiliary power supply module;

[0035] The thick film hybrid integrated DC / DC converter is a thick film forward synchronous rectifier converter, which mainly includes a primary circuit and a secondary circuit. The primary circuit and the secondary circuit transfer energy through a transformer composed of primary and secondary windings in a planar magnetic integrated module.

[0036] Among them, the primary circuit of the thick film hybrid integrated DC / DC converter and the primary winding N in the planar magnetic integrated module P connected, responsible for transferring grid energy to the secondary circuit; the secondary circuit is connected to the secondary winding N in the planar magnetic integrated module S And filter inductor winding N L Phase connection, primary winding N P and the secondary winding N S The transformer is composed of a secondary winding N S Responsible for the primary winding N P The voltage on the secondary circuit is converted into the voltage required by the secondary circuit, and then passes through the synchronous rectifier in the secondary circuit and then through the filter inductor winding N L The output voltage is obtained after the LC filter circuit composed of the capacitor and the

[0037] In this embodiment, the types of thick film forward synchronous rectification converters include: thick film resonant reset forward synchronous rectification converter, thick film RCD reset forward synchronous rectification converter and thick film active clamp forward synchronous rectification converter.

[0038] like Figure 1 As shown, the primary circuit of the thick film active clamp forward synchronous rectifier converter in this embodiment includes: a DC power supply, a transformer part in a planar magnetic integrated module, power switch tubes S1 and S2, and a clamping capacitor C1; the positive electrode of the DC power supply is connected to the primary winding N in the planar magnetic integrated structure. P The same-name end of the primary winding N PThe opposite end is connected to the drain of the power switch tube S1 and the first end of the clamp capacitor C1; the second end of the clamp capacitor C1 is connected to the drain of the power switch tube S2; the source of the power switch tubes S1 and S2 is connected to the negative electrode of the DC input power supply; the secondary circuit of the active clamp forward synchronous rectification converter includes: a MOSFET synchronous rectifier connected in parallel with the power switch tubes S3 and S4, a secondary winding N in the planar magnetic integrated structure S And filter inductor winding N L 、Filter capacitor C o and load R o ; Secondary winding N in planar magnetic integrated structure S The same-name end is connected to the drain of the freewheeling tube S4 and the filter inductor winding N L The same-name end of the filter inductor winding N L The opposite end of the filter capacitor C o The first end and the load R o Positive pole of output terminal; secondary winding N S The opposite end is connected to the drain of the rectifier tube S3; the source of the power switch tube S3 and S4 is connected to the filter capacitor C o The second end and load R o The negative terminal of the output is connected.

[0039] like Figure 1 As shown, the planar magnetic integrated module includes: a magnetic core, a primary winding N P and the secondary winding N S , filter inductor winding N L and auxiliary power supply winding N F ; Among them, the core structure is a three-column type, such as Figure 2 As shown, it specifically includes a first magnetic column, a second magnetic column, a third magnetic column, a first opening, a second opening and an air gap; there is no air gap on the first magnetic column, the second magnetic column and the third magnetic column are both provided with air gaps, and a stainless steel gasket is used to fill the air gap in the middle of the second magnetic column;

[0040] Primary winding N P and the secondary winding N S Both are wound around the first magnetic column of the magnetic core. When winding, the primary winding N P and the secondary winding N S Bypass the outside of the core and the first opening, the primary winding N P The same-name end and opposite-name end of the planar magnetic integrated module are ports A and B, and the secondary winding N S The opposite end is port C of the module;

[0041] In this embodiment, the primary winding N P and the secondary winding N SThe winding structure between the two windings is completely staggered, and is realized by PCB routing. Compared with round copper wire and copper foil windings, it is easier to realize a completely staggered arrangement structure. When winding, try to increase the facing area of ​​the primary and secondary windings. This winding method can improve the coupling coefficient of the primary and secondary windings, while reducing the leakage inductance, it can also reduce the AC loss caused by the skin effect and the proximity effect. The DC loss can also be reduced by reasonably designing the copper thickness and line width of the PCB winding. However, due to the limitations of the PCB process, the maximum copper thickness is only 4oz (about 0.14mm), so multiple PCB windings are often connected in parallel to reduce the internal resistance and current density. Figure 3 As shown, in order to facilitate the connection between the integrated magnetic component and the circuit, a half-hole setting is adopted at the connection of the PCB winding.

[0042] Filter inductor winding N L and auxiliary power supply winding N F Wound around the third magnetic column of the magnetic core, the filter inductor winding N L and auxiliary power supply winding N F Bypassing the second opening and the outside of the magnetic core, the two windings are coupled to each other; after winding, the filter inductor winding N L The same-name end is the port D of the planar magnetic integrated module, and its opposite-name end is connected to the secondary winding N S The same-named ends are connected together as port E of the planar magnetic integrated module, and the auxiliary power supply winding N F The same-name terminal and opposite-name terminal of are F and H of the planar magnetic integrated module respectively;

[0043] In this embodiment, the filter inductor winding N L Copper foil winding is used to bypass the outer side of the magnetic core and the second opening, and the copper foil is placed vertically to save space. The use of copper foil winding can also avoid the problem of excessive water vapor at high temperature caused by the large-scale use of PCB boards, ensuring the high reliability of thick film hybrid integrated power supply. Auxiliary power supply winding N F Suspended on the filter inductor winding N L Although the two are coupled to each other, there is no requirement for coupling, and because the auxiliary power supply winding N F The current passing through is small, and the loss on it can be basically ignored, so a round copper wire with a smaller diameter can be selected for winding to save space. When the transformer side winding and the filter inductor winding are integrated, the forward coupling method is adopted, that is, the magnetic flux cancels each other in the middle column and strengthens in the magnetic column. The magnetic core with an air gap between the middle column and the third magnetic column can be used in conjunction with the forward coupling integration method to reduce current ripple, but because the power supply system has high requirements for leakage inductance, there are many factors to consider for the air gap length of the middle column. The air gap length of the third magnetic column is mainly related to the energy required to be stored in the filter inductor.

[0044] Auxiliary power supply module, including a power supply circuit during startup and a power supply circuit during stability;

[0045] The power supply circuit at startup is an electronic filter, which specifically includes: a DC power supply, an NPN transistor, a resistor R1, a voltage regulator Z1, capacitors C2 and C3, and a diode D1; the positive electrode of the DC input power supply is connected to the collector of the NPN transistor and one end of the resistor R1; the second end of the resistor R1 is connected to the base of the NPN transistor, the first end of the capacitor C2, and the cathode of the voltage regulator Z1; the emitter of the NPN transistor is connected to the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C3 and the power supply end of the MOSFET isolation driver chip; the negative electrode of the DC input power supply is connected to the capacitors C2, C3, and the anode of the voltage regulator Z1;

[0046] The stable power supply circuit includes: Schottky diode D2 and auxiliary power supply winding N F ; Auxiliary power supply winding N F The same-name end of the diode D1 is connected to the anode of the diode D2, and the opposite-name end is connected to the second end of the capacitor C3; the cathode of the diode D2 is connected to the power supply end of the MOSFET isolation driver chip, the cathode of the diode D1 and the first end of the capacitor C3;

[0047] When the thick film hybrid integrated DC / DC converter starts, the filter inductor winding N L The voltage has not been established yet. At this time, the power supply of the chip is provided by the electronic filter. At this time, after the input voltage is clamped at a certain voltage value by the voltage regulator Z1, a voltage drop is generated through the NPN transistor and the diode D1, and finally the power supply voltage is formed; when the power supply is running in a steady state, the filter inductor winding N L The upper voltage is stable, the auxiliary power supply winding N F With inductor winding N L The inductive voltage is generated due to the coupling effect, and the induced voltage provides an auxiliary power supply voltage after generating a voltage drop through the Schottky diode D2. At this time, the electronic filter is in a non-working state.

[0048] The following is a detailed description of the role and parameter design of planar magnetic integrated devices:

[0049] According to the principle of magnetic flux superposition, the alternating magnetic flux on the third magnetic column is equal to the sum of the alternating magnetic flux generated by the winding on the magnetic column itself and the coupling magnetic flux generated by the windings on other magnetic columns. Figure 2 The integrated magnetic components shown can be obtained as follows: ΔΦ3=ΔΦ 33 +ΔΦ 13 , where ΔΦ3 is the alternating magnetic flux in the third magnetic column; ΔΦ 33 is the alternating magnetic flux generated by the winding on the third magnetic column; ΔΦ 13 is the coupling component of the alternating magnetic flux in the first magnetic column in the third magnetic column.

[0050] According to the law of electromagnetic induction, the voltage across the winding is determined by the number of turns of the winding and the rate of change of the magnetic flux. When the number of turns of the winding and the voltage across it remain unchanged, the alternating magnetic flux of the magnetic column where the winding is located will not change. 33 and ΔΦ 13 The direction is the same, and ΔΦ3 remains unchanged, then due to ΔΦ 13 The coupling effect is equivalent to ΔΦ 33 The current ripple in the output inductor is reduced. Therefore, when the air gap is opened in the middle column and forward coupling is adopted, the alternating magnetic flux on the transformer side will couple part of the same-direction magnetic flux on the inductor side to achieve the effect of reducing the current ripple. However, the application of planar magnetic integrated devices here mainly focuses on efficiency indicators, and does not pursue the extreme scenario of zero current ripple.

[0051] The parameters of the planar magnetic integrated module mainly include the number of turns of each winding and the air gap length. The turns ratio on the transformer side is mainly related to the process of energy transmission of the converter. The number of turns and air gap length on the inductor side are mainly determined by the inductance and saturation flux density. The air gap length of the second magnetic column is mainly determined by the leakage inductance requirements and the saturation flux density.

[0052] Below we describe in detail the parameter design process of the planar magnetic integrated module. The specific process is as follows Figure 4 As shown, the input voltage range and output voltage of the DC / DC converter are calibrated. According to the input voltage, output voltage, duty cycle range shown in the control module and the relationship between the input voltage and output voltage of the forward converter, The turns ratio of the transformer can be obtained.

[0053] Where N is the turns ratio of the transformer, D is the duty cycle of the converter, and its range is determined by the power management chip of the control module. in is the input voltage, V o is the output voltage.

[0054] After obtaining the transformer turns ratio N, the inductor current ripple setting value and Faraday's law of electromagnetic induction are used to calculate the The calculation formula of inductance value can be obtained: Here, the ripple current ΔI o Assuming the output current is 15%, where ΔI o is the ripple current, F s is the switching frequency.

[0055] Then select the size and material of the magnetic core, and set the air gap factor Z of the third magnetic column to a typical value of 20, combined with the relationship between the air gap factor and inductance: The number of turns N on the inductor side can be obtained L .

[0056] In the formula, μo is the vacuum magnetic permeability, μ c The relative magnetic permeability, A e is the cross-sectional area of ​​the core column, l e is the magnetic path length of the core.

[0057] The design of the overall magnetic components must prevent local saturation or saturation of the magnetic core in order to work properly in the converter. The air gap length has an important relationship with the size of the saturation flux density. The limiting formula for the flux density is: ΔB i(max) / 2+B dci(max) <B s ,(i=1,2,3), where B s The maximum saturation flux density is set after considering the core loss and the maximum saturation flux density of the core itself. i is the alternating component of magnetic flux density, B dci is the DC component of the magnetic flux density. By combining this formula with the above setting of the air gap factor Z of the third magnetic column to 20, the number of turns of the primary and secondary windings on the transformer side and the air gap length lg1 of the middle column can be obtained.

[0058] The design of integrated magnetic components cannot stop at theoretical calculations. Samples must be made to observe the rationality of the parameter settings to determine the optimization direction of the magnetic components. After making the magnetic component samples here, the actual leakage inductance of the transformer composed of the primary and secondary windings needs to be measured. If it does not meet the requirements of the converter, the air gap length lg1 of the second magnetic column of the magnetic core should be changed first, and then the air gap length lg2 of the third magnetic column should be changed. During the process of changing the air gap length, the magnetic flux density must be estimated at all times to prevent saturation during operation. Therefore, this process requires continuous iterative optimization to obtain parameters suitable for the corresponding converter. When the leakage inductance meets the requirements, the number of turns on the inductor side is changed to maintain the inductance value.

[0059] The current in the copper wire of the auxiliary power supply winding is small, and the effect of this part of the winding on the magnetic flux density can be ignored here. The number of turns of this winding is determined by the number of inductor turns N. L And the power supply voltage U required by the driver chip pvcc Determine, the formula is

[0060] The auxiliary power supply circuit of this power supply system is as follows Figure 5 As shown in the figure, during the power startup phase, the voltage on the inductor side has not yet been established. At this time, the power supply of the chip is provided by the electronic filter in the first half. At this time, after the input voltage is stabilized at a certain voltage value through the voltage regulator Z1, a voltage drop is generated through the NPN transistor and the diode D1, and finally the power supply voltage is formed. When the power supply is in steady state operation, the voltage on the inductor side is stable, and the auxiliary power supply winding N F Due to the inductance winding N LOn the same side, an induced voltage is generated, which provides auxiliary power supply voltage after a voltage drop is generated by Schottky diode D2. At this time, the electronic filter in the first half is not working. Through the design of this auxiliary power supply circuit, the conduction loss of the NPN transistor can be reduced when the voltage is stable, and the power supply at this time is mainly obtained by induction on the inductor side, so fewer devices are used, which has almost no effect on the overall power density, but improves the efficiency of the overall power supply system.

[0061] Although the above describes the illustrative specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A thick film hybrid integrated power system based on planar magnetic integration technology, characterized in that: include: Thick film hybrid integrated DC / DC converter, planar magnetic integrated module and auxiliary power supply module; The thick film hybrid integrated DC / DC converter is a thick film forward synchronous rectifier converter, which mainly includes a primary circuit and a secondary circuit. The primary circuit and the secondary circuit transfer energy through a transformer composed of primary and secondary windings in a planar magnetic integrated module. Among them, the primary circuit of the thick film hybrid integrated DC / DC converter and the primary winding N in the planar magnetic integrated module P connected, responsible for transferring grid energy to the secondary circuit; the secondary circuit is connected to the secondary winding N in the planar magnetic integrated module S And filter inductor winding N L Phase connection, primary winding N P and the secondary winding N S The transformer is composed of a secondary winding N S Responsible for the primary winding N P The voltage on the secondary circuit is converted into the voltage required by the secondary circuit, and then passes through the synchronous rectifier in the secondary circuit and then through the filter inductor winding N L The output voltage is obtained after the LC filter circuit composed of capacitors; The planar magnetic integrated module comprises: a magnetic core, a primary winding N P and the secondary winding N S , filter inductor winding N L and auxiliary power supply winding N F ; Wherein, the magnetic core structure is a three-magnetic column type, specifically including a first magnetic column, a second magnetic column, a third magnetic column, a first opening, a second opening and an air gap; Primary winding N P and the secondary winding N S Both are wound around the first magnetic column of the magnetic core. When winding, the primary winding N P and the secondary winding N S Bypass the outside of the core and the first opening, the primary winding N P The same-name end and opposite-name end of the planar magnetic integrated module are ports A and B, and the secondary winding N S The opposite end is port C of the module; Filter inductor winding N L and auxiliary power supply winding N F Wound around the third magnetic column of the magnetic core, the filter inductor winding N L and auxiliary power supply winding N F Bypassing the second opening and the outside of the magnetic core, the two windings are coupled to each other; after winding, the filter inductor winding N L The same-name end is the port D of the planar magnetic integrated module, and its opposite-name end is connected to the secondary winding N S The same-named ends are connected together as port E of the planar magnetic integrated module, and the auxiliary power supply winding N F The same-name terminal and opposite-name terminal of are F and H of the planar magnetic integrated module respectively; The auxiliary power supply module includes a power supply circuit during startup and a power supply circuit during stability; The power supply circuit at startup is an electronic filter, which specifically includes: a DC power supply, an NPN transistor, a resistor R1, a voltage regulator Z1, capacitors C2 and C3, and a diode D1; the positive electrode of the DC input power supply is connected to the collector of the NPN transistor and one end of the resistor R1; the second end of the resistor R1 is connected to the base of the NPN transistor, the first end of the capacitor C2, and the cathode of the voltage regulator Z1; the emitter of the NPN transistor is connected to the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C3 and the power supply end of the MOSFET isolation driver chip; the negative electrode of the DC input power supply is connected to the capacitors C2, C3, and the anode of the voltage regulator Z1; The stable power supply circuit includes: Schottky diode D2 and auxiliary power supply winding N F ; Auxiliary power supply winding N F The same-name end of the diode D1 is connected to the anode of the diode D2, and the opposite-name end is connected to the second end of the capacitor C3; the cathode of the diode D2 is connected to the power supply end of the MOSFET isolation driver chip, the cathode of the diode D1 and the first end of the capacitor C3; When the thick film hybrid integrated DC / DC converter starts, the filter inductor winding N L The voltage has not been established yet. At this time, the power supply of the chip is provided by the electronic filter. At this time, after the input voltage is clamped at a certain voltage value by the voltage regulator Z1, a voltage drop is generated through the NPN transistor and the diode D1, and finally the power supply voltage is formed; when the power supply is running in a steady state, the filter inductor winding N L The upper voltage is stable, the auxiliary power supply winding N F With inductor winding N L The inductive voltage is generated due to the coupling effect, and the induced voltage provides an auxiliary power supply voltage after generating a voltage drop through the Schottky diode D2. At this time, the electronic filter is in a non-working state.

2. The thick film hybrid integrated power system based on planar magnetic integration technology according to claim 1, characterized in that: The types of thick film forward synchronous rectification converters include: thick film resonant reset forward synchronous rectification converter, thick film RCD reset forward synchronous rectification converter and thick film active clamp forward synchronous rectification converter.

3. The thick film hybrid integrated power system based on planar magnetic integration technology according to claim 1, characterized in that: The primary winding N P and the secondary winding N S The winding structure between them is completely staggered, all of which are realized by PCB routing, half holes are used at the connection, and the facing area of ​​the primary and secondary PCB windings is increased.

4. The thick film hybrid integrated power system based on planar magnetic integration technology according to claim 1, characterized in that: The filter inductor winding N L Copper foil vertical winding is adopted, and the auxiliary power supply winding N F Floating on filter inductor winding N L Above, round copper wire is used for winding.

5. The thick film hybrid integrated power system based on planar magnetic integration technology according to claim 1, characterized in that: The first magnetic column has no air gap, the second magnetic column and the third magnetic column both have air gaps, and the air gap in the middle of the second magnetic column is filled with a stainless steel gasket.

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