Hybrid converter for metal electro-plastic treatment and cooperative temperature control method

Abstract

The invention relates to the technical field of power electronics, and discloses a hybrid converter for metal electro-plastic treatment and a cooperative temperature control method, and the hybrid converter comprises a phase-shifted full-bridge circuit, a rectification filter circuit, a pulse generation circuit and a bootstrap clamping energy feedback circuit; wherein the phase-shifted full-bridge circuit is connected with the rectifier filter circuit through the transformer to jointly form a direct current output side; the peak pulse side is composed of a pulse generation circuit in a current rising stage and a bootstrap clamping energy feedback circuit controlled in a falling stage. The cooperative temperature control method is applied to the hybrid converter. According to the invention, the technical problem of limitation of a single current waveform in electroplastic research in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power electronics, and particularly relates to a mixed converter for metal electroplastic processing and a temperature control method. BACKGROUND

[0002] With the increasing demand for metal properties in the fields of aviation and electronics, the traditional metal processing method of heat conduction is complicated, energy-consuming and has a small effect on improving metal properties, and therefore cannot meet the processing and production requirements of high-end metal materials. Therefore, the electroplasticity of metal materials has become a major direction for future development. At present, there is no power supply for metal processing on the market, and only power supplies with similar output parameters can be selected and purchased. The current form is mainly direct current or pulse, and the pulse power supply is a blind area for studying the electroplasticity of metal. Electronic wind, thermal activation strain rate and induced magnetic field effect are the main theoretical starting points, but they cannot correctly and quantitatively analyze the specific influence of current parameter changes on metal properties.

[0003] The analysis of the mechanism of metal electroplasticity mainly involves thermal effect and electric effect, and the research on electric effect is the key to revealing the essential mechanism. In order to accurately explore the effect of electric effect, it is necessary to effectively distinguish it from thermal effect. Generally, the effect of direct current is dominated by thermal effect, and the application of high-energy pulse current (100-1000 A / mm²) is the main means to highlight electric effect. At present, the power supply widely used in metal electroplastic processing is mainly in the form of direct current, and the application of pulse current is relatively limited. In practice, capacitive energy storage is often used as the instantaneous energy source. Such power supplies generally have the disadvantages of serious pulse tail, large size, high heat loss and the like. In addition, the switching devices of such power supplies are mainly thyristors, and there are certain limitations in controllability and working frequency. SUMMARY

[0004] The application aims to provide a mixed converter for metal electroplastic processing and a temperature control method, so as to solve the technical problem of the limitation of a single current waveform in the research on electroplasticity.

[0005] To achieve the above-mentioned purpose, the application provides a mixed converter for metal electroplastic processing, which comprises a phase-shifted full-bridge circuit, a rectification filter circuit, a pulse generation circuit and a bootstrap clamping energy supply circuit. The phase-shifted full-bridge circuit is connected with the rectification filter circuit through a transformer, and together constitutes a direct current output side. The peak pulse side is composed of the pulse generation circuit in the current rising stage and the bootstrap clamping energy supply circuit controlled in the falling stage.

[0006] Preferably, the phase-shifted full-bridge inverter circuit comprises diodes , capacitors , switching tubes , switching tubes , switch tube , switch tube , capacitor , capacitor , capacitor , capacitor and inductor ; wherein: diode and capacitor are input parts of the inverter circuit; switch tube to constitute a full-bridge inverter circuit, and capacitor to in parallel are respectively connected to switch tube and primary transformer in series, so that inductor and parallel capacitor of switch tube constitute soft switching.

[0007] As a preferred embodiment, the rectifier filter circuit comprises diode , diode , diode , inductor and capacitor ; wherein: diode and constitute a full-wave rectifier circuit, inductor and parallel capacitor are connected in series, and diode is connected in series at the output end, so that the output currents on each side are relatively independent.

[0008] As a preferred embodiment, the pulse generating circuit comprises switch tube , switch tube , switch tube , switch tube , diode , diode and capacitor ; wherein: switch tube to constitute a full-bridge pulse generating circuit, diode and capacitor are connected in parallel at the output to provide energy for the pulse peak, and diode is connected in series at the output side, so that the output currents are relatively independent.

[0009] As a preferred embodiment, the bootstrap clamping energy feeding circuit comprises diode , diode , inductor , switch tube and capacitor ; wherein: diode , inductor , switch tube and capacitor Series connection, diode Parallel to inductor With switching transistor middle.

[0010] Preferably, metallic materials and stray inductance include inductors. and resistance Among them: inductance and resistance It is represented by a series structure, which represents the actual load situation.

[0011] Preferably, the DC output side is equipped with a corresponding control method, including: Acquire the output current of the rectifier and filter circuit The size serves as feedback and sets the DC output size. The difference is calculated and transmitted to the preset proportional-integral module. After limiting, the dead-time, direction shift, and inversion control are applied to the four switches of the full-bridge inverter circuit. to This allows for the control of the output circuit.

[0012] Preferably, a corresponding control method is provided on the pulse peak side, including: The rising phase is when the peak current value is collected. With the set peak The difference between the magnitudes is fed into the proportional-integral module to control the switching transistor. With switching transistor The pulse width is adjusted to regulate the output peak value and capacitor voltage. This is in the switching transistor With switching transistor Adjust the switching transistor under conduction conditions The conduction time is adjusted to regulate the energy feedback amount, and to perform the following: Flexible adjustment.

[0013] Preferably, the hybrid converter is equipped with a corresponding collaborative temperature control method, including: DC side by collecting output current As a feedback control variable, the DC power is calculated in conjunction with the load parameters; the power calculation on the peak pulse side is performed separately for the rising and falling phases to obtain the peak pulse power. The total power is the sum of the DC power and the peak pulse power; In total power control, when a peak pulse power is applied, the DC power needs to be adjusted accordingly to stabilize the total power at the set value. DC power is adjusted by controlling the phase angle of the phase-shifted full-bridge circuit; peak pulse power is adjusted by changing the pulse frequency or adjusting the falling platform voltage to control the rate of current decrease.

[0014] As preferred, the calculation process of the peak pulse power is specifically based on the circuit inductance, input voltage, falling platform voltage, set peak current and pulse frequency, and the average power of the part is obtained by the current square integral method.

[0015] Beneficial effects: the metal electroplasticity processing hybrid converter and the collaborative temperature control method can flexibly output the combination of direct current and pulse, further explore the change mechanism of metal electroplasticity, greatly speed up the discharge and control by adding the bootstrap clamp energy feeding circuit, thereby reducing the thermal effect of the pulse, highlighting the electrical effect, decoupling the electricity and heat, making the electroplasticity exploration process clearer, and highlighting the influence of the peak electrical effect on the metal electroplasticity at a fixed temperature by controlling the temperature with the direct current and the peak. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The overall topology structure diagram of the metal electroplasticity processing hybrid converter provided by the embodiments of the present application is shown in the figure. Figure 2 The topology structure diagram of the phase-shift full-bridge inverter circuit provided by the embodiments of the present application is shown in the figure. Figure 3 The topology structure diagram of the rectifier filter circuit provided by the embodiments of the present application is shown in the figure. Figure 4 The topology structure diagram of the pulse generation circuit provided by the embodiments of the present application is shown in the figure. Figure 5 The topology structure diagram of the bootstrap clamp energy feeding circuit provided by the embodiments of the present application is shown in the figure. Figure 6 The topology structure diagram of the metal material and stray inductance provided by the embodiments of the present application is shown in the figure. Figure 7 The DC side control method block diagram of the hybrid converter provided by the embodiments of the present application is shown in the figure. Figure 8 The pulse peak side control method block diagram of the hybrid converter provided by the embodiments of the present application is shown in the figure. Figure 9 The logic diagram of the collaborative temperature control of the hybrid converter provided by the embodiments of the present application is shown in the figure. Figure 10 The simulation waveform provided by the embodiments of the present application is shown in the figure. Figure 1 ; Figure 11 Simulation waveforms provided for the embodiments of the present application Figure 2 ; Figure 12 Simulation waveforms provided for the embodiments of the present application Figure 3 .

[0018] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0020] In this document, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0021] Unlike the existing single direct current or pulse power supply, the embodiment discloses a hybrid converter for metal electroplasticity treatment and a collaborative temperature control method, provides a hybrid converter for metal electroplasticity treatment, that is, the metal plasticity change under single direct current or pulse can be studied, and the electroplasticity situation of instantaneous high-energy pulse injection under direct current temperature control can be explored. The self-lift clamping energy feeding circuit is added in the topology, so that the pulse tail time can be accelerated and controlled, and the thermal effect influence brought by the instantaneous high-energy pulse can be more significantly reduced.

[0022] The hybrid converter for metal electroplasticity treatment disclosed in the embodiment will be described in detail.

[0023] Referring to Figure 1 , Figure 1 The overall topology structure diagram of the hybrid converter for metal electroplasticity treatment provided in the embodiments of the present application is shown.

[0024] As Figure 1As shown, the embodiment discloses a mixed converter of metal electroplastic processing, comprising: a phase-shift full-bridge circuit, a rectification filter circuit, a pulse generation circuit and a bootstrap clamp feeding circuit; wherein: the phase-shift full-bridge circuit is connected with the rectification filter circuit through a transformer to jointly constitute a direct current output side; the peak pulse side is composed of the pulse generation circuit in the current rising stage and the bootstrap clamp feeding circuit controlled in the falling stage.

[0025] In the specific application of the embodiment, the phase-shift full-bridge circuit and the rectification filter circuit are the output end of the direct current thermal effect, and the pulse generation circuit and the bootstrap clamp feeding circuit are the influence of the prominent pulse electric effect. The overall topology structure of the mixed converter of the embodiment combines the direct current thermal effect and the peak electric effect in the output waveform, and solves the limitation of the electroplasticity research under the single current waveform. Specifically: The direct current side controls the current size by the phase-shift full-bridge circuit, aiming to have a fixed output current under a wide range of input voltages; The topology structure of the peak side can inject high-energy pulses instantaneously on the basis of direct current to study the electric effect of metal materials at the phase change temperature; the bootstrap clamp feeding circuit can use the energy of the line stray inductance to provide a higher clamping voltage for the pulse discharge process, accelerate the discharge speed to reduce the heat generated by the peak pulse; Further, the cooperative temperature control realizes the precise temperature control by inversely deducing the output power by the current area method.

[0026] Referring to Figure 2 , Figure 2 The embodiment provides a topology structure diagram of a phase-shift full-bridge inverter circuit.

[0027] As Figure 2 shown, the phase-shift full-bridge inverter circuit comprises diodes , capacitors , switch tubes , switch tubes , switch tubes , switch tubes , capacitors , capacitors , capacitors , capacitors and inductors ; wherein: the diodes and the capacitors are input parts of the inverter circuit; the switch tubes to constitute a full-bridge inverter circuit, and the capacitors to are connected in parallel, respectively, and the inductor is connected in series with the primary side transformer, so that the inductor and the parallel capacitors of the switch constitute a soft switch.

[0028] Referring to Figure 3 , Figure 3 The topological structure diagram of the rectifier filter circuit provided by the embodiment of the application is shown.

[0029] As Figure 3 shown, the rectifier filter circuit comprises diodes , diodes , diodes , an inductor and a capacitor ; wherein: the diodes and constitute a full-wave rectifier circuit, the inductor is connected in series and the capacitor is connected in parallel, and the output end is connected in series with the diodes , so that the output currents on each side are relatively independent.

[0030] Referring to Figure 4 , Figure 4 The topological structure diagram of the pulse generation circuit provided by the embodiment of the application is shown.

[0031] As Figure 4 shown, the pulse generation circuit comprises switch tubes , switch tubes , switch tubes , switch tubes , diodes , diodes and a capacitor ; wherein: the switch tubes to constitute a full-bridge pulse generation circuit, the output diodes are connected in parallel with the capacitor to provide energy for the pulse peak value, and the output series side diodes also make the output currents relatively independent.

[0032] Referring to Figure 5 , Figure 5 The topological structure diagram of the bootstrap clamping energy feeding circuit provided by the embodiment of the application is shown.

[0033] As Figure 5 shown, the bootstrap clamping energy feeding circuit comprises diodes , diodes , an inductor , switch tubes and a capacitor ; wherein: the diodes , the inductor , the switch tubes and the capacitor are connected in series, and the diodes are connected in parallel to the inductor and switch tube intermediate.

[0034] Referring to Figure 6 , Figure 6 The metal material and stray inductance provided in the embodiment of the application are shown in a topological structure diagram.

[0035] As Figure 6 shown, the metal material and stray inductance include an inductor and a resistor ; wherein: the inductor and the resistor are represented in a series structure, representing an actual load condition.

[0036] In the specific application of the embodiment, the phase-shift full-bridge inverter circuit and the rectification filter circuit are connected through a transformer, and together constitute a direct-current output side.

[0037] In the specific application of the embodiment, the pulse peak side is constituted by a pulse generation circuit and a bootstrap clamping energy feeding circuit, and is respectively responsible for the control of the rising and falling stages of the pulse peak.

[0038] The direct-current side output control is based on the phase angle control of the inverter circuit, and can ensure the stability of the output current in a wide range of voltage input.

[0039] The pulse peak control uses the conduction pulse width of switch tube and switch tube to control the peak current size in the rising stage, and uses a higher discharge platform provided by capacitor to accelerate the current decay in the falling stage, thereby effectively suppressing the tail current and reducing the heat loss generated thereby, so that the heat power generated in the pulse process is more controllable.

[0040] The bootstrap clamping energy feeding circuit shown in Figure 5 is the key to making the falling process of the peak pulse controllable, and the size of the capacitor voltage in the bootstrap clamping energy feeding circuit is irrelevant to the input voltage source, and is only related to the energy in the circuit. Compared with the traditional full-bridge pulse circuit, the discharge process can be independently controlled and accelerated, and especially in the case of low voltage and large stray inductance, the improvement of the tail current is particularly obvious.

[0041] After switch tube and switch tube are turned off, the remaining current in the stray inductance charges capacitor through a freewheeling path. When the next pulse period comes, switch tube is turned on, and the current is limited through inductor and fed back to capacitor , the charging process is repeated, so that the capacitor voltage rises to a higher level, and the pulse current is accelerated to decay. The voltage value of the capacitor can be set by adjusting the inductance and the parameters of the capacitor , or by controlling the on-time of the switch tube to adjust the energy feedback amount, thereby achieving flexible regulation of the capacitor .

[0042] Referring to Figure 7 , Figure 7 the DC side control method block diagram of the hybrid converter provided in the embodiments of the present application.

[0043] As shown in Figure 7 , the DC side control method of the hybrid converter in the embodiments of the present application realizes the details as follows: the size of the output current of the rectifier filter circuit is collected as feedback, and the difference between the set DC output size is calculated and transmitted to the preset PI (proportional integral) module, and after limiting (LIM), the dead zone, shift and NOT (NOT) are used to regulate the four switch tubes to , thereby realizing the control of the output circuit.

[0044] Referring to Figure 8 , Figure 8 the pulse peak side control method block diagram of the hybrid converter provided in the embodiments of the present application.

[0045] As shown in Figure 8 , the rising stage is to collect the peak current value and calculate the difference between the set peak value to send into the PI to control the pulse width of and , thereby adjusting the size of the output peak value , then in the on state of and , the on-time of is adjusted to adjust the energy feedback amount, thereby achieving flexible regulation of .

[0046] Referring to Figure 9 , Figure 9 the logic diagram of the cooperative temperature control of the hybrid converter provided in the embodiments of the present application.

[0047] As shown in Figure 9The implementation details of the cooperative temperature control of the hybrid converter are shown as follows: the DC side collects the output current as a feedback control quantity, and calculates the DC power in combination with the known load parameters. The power calculation of the peak pulse side is performed in the rising stage and the falling stage respectively: under the conditions that the circuit inductance, the input voltage, the falling platform voltage, the set peak current and the pulse frequency are known, the average power of this part is obtained by the current square integral method. The total power of the system is the sum of the DC power and the peak pulse power. In the total power control, when the peak pulse power is added, the DC power needs to be adjusted accordingly to make the total power stable at the set value. The adjustment of the DC power is realized by controlling the phase angle of the phase-shift full-bridge; the adjustment of the peak pulse power can be realized by changing the pulse frequency or adjusting the falling platform voltage to control the current falling rate on the premise of setting the peak current.

[0048] Reference Figure 10 to Figure 12 , Figure 10 Simulation waveforms provided by the embodiment of the application Figure 1 , Figure 11 Simulation waveforms provided by the embodiment of the application Figure 2 , Figure 12 Simulation waveforms provided by the embodiment of the application Figure 3 .

[0049] Figure 10 The DC output side 200A, the peak pulse side 1900A, the frequency is 500 Hz, the pulse width is 40 μs, is the simulation waveform diagram under 755 V, Figure 11 The DC output side provided by the embodiment of the application is still 200A, the peak side changes the pulse width to 25 μs, the corresponding peak current is reduced to 1600A, and Figure 12 The DC provided by the embodiment of the application is changed to 500A, the peak side parameters remain unchanged, and finally the peak pulse is 1850A.

[0050] As Figure 10 shown, in the figure: (a) the green G_5 is the driving waveform of the peak pulse generation circuit; (b) the green Iout_DC is the output current waveform of the DC side; the red Iout_Pulse is the output current waveform of the peak side; the yellow Iout is the output waveform of the DC plus peak in the mixed state; the blue Iout1 is the output waveform without the DC and the bootstrap energy feeding circuit; since Iout and Iout_DC, Iout_Pulse will partially overlap, so the final output current Iout is mainly observed; (c) is the circuit voltage condition, the green Vout_DC is the output voltage of the DC side; the blue Vout_Pulse is the output voltage of the peak side, the red Vout is the total output voltage; the yellow Vc is the bootstrap embedding energy feeding voltage; it should be noted that the green Vout_DC will be overlapped and blocked by the red Vout.

[0051] like Figure 11 As shown in the figure: (a) green G_5 is the driving waveform of the peak pulse generation circuit; (b) green Iout_DC is the DC side output current waveform; red Iout_Pulse is the peak side output current waveform; yellow Iout is the DC plus peak output waveform in the mixed state; blue Iout1 is the output waveform without DC and bootstrap power supply circuit; since Iout, Iout_DC, and Iout_Pulse will partially overlap, the main focus is on observing the final output current Iout; (c) shows the circuit voltage situation, green Vout_DC is the DC side output voltage; blue Vout_Pulse is the peak side output voltage; red Vout is the total output voltage; yellow Vc is the bootstrap clamp power supply voltage; it should be noted that green Vout_DC will be obscured by red Vout.

[0052] like Figure 12 As shown in the figure: (a) green G_5 is the driving waveform of the peak pulse generation circuit; (b) green Iout_DC is the DC side output current waveform; red Iout_Pulse is the peak side output current waveform; yellow Iout is the DC plus peak output waveform in the mixed state; blue Iout1 is the output waveform without DC and bootstrap power supply circuit; since Iout, Iout_DC, and Iout_Pulse will partially overlap, the main focus is on observing the final output current Iout; (c) shows the circuit voltage situation, green Vout_DC is the DC side output voltage; blue Vout_Pulse is the peak side output voltage; red Vout is the total output voltage; yellow Vc is the bootstrap clamp power supply voltage; it should be noted that green Vout_DC will be obscured by red Vout.

[0053] Figure 10 to Figure 12 This is a simulation waveform diagram of the hybrid converter in this embodiment under DC plus pulse hybrid output. The corresponding main parameters include peak side current. DC side current and bootstrap clamping power supply voltage Meanwhile, the simulation parameters are designed as follows: the load is a TC4 titanium alloy with a length of 100mm, a width of 25mm, and a height of 0.5mm; the line stray current is 4μH; the DC side filter inductance is 35μH; the phase-shifted full-bridge soft-opening tube inductance is 4.5μH; the operating voltage of the phase-shifted full-bridge and pulse peak is 250V; and the transformer primary and secondary side ratio is 8:1.

[0054] like Figure 10 As shown, 20μF The voltage is 25μF, and waveform (a) in the figure shows the drive signal for the pulse output. From...Figure 10 It can be seen that the falling process of the pulse peak is faster than the rising process by 15 μs, and it can also be seen that it is greatly accelerated compared with the original pulse generating circuit output out1.

[0055] As Figure 11 shown, the peak side pulse width , , is changed to 25 μs, 30 μH, 10 μF, at this time, the output peak value is 1600 A, 950 V, and the falling time is 7 μs.

[0056] As Figure 12 shown, the DC output parameter size is changed, adjusted to 500 A, and other parameters remain unchanged, at this time, the peak current is 1850 A, unchanged, and the pulse falling time is 7.1 μs.

[0057] Based Figure 10 to Figure 12 on the above, it is clear that the metal electroplasticity processing hybrid converter and control method of the embodiment at least achieves the following technical effects: For traditional metal electroplasticity heating, direct current is often used, and the current waveform of high-energy pulse injection test is less, or only a single pulse waveform. The metal electroplasticity is not a single thermal effect, so the above-mentioned traditional waveform cannot decouple the direct current thermal effect and the electric effect. To this end, the metal electroplasticity processing hybrid converter of the embodiment can flexibly output the combination of direct current and pulse, and can more systematically explore the change mechanism of metal electroplasticity.

[0058] From Figure 10 to Figure 12 , it can be seen from the corresponding (b) that compared with the blue Iout1 original pulse generating circuit, the addition of the bootstrap clamp energy feeding circuit of the embodiment can greatly accelerate the discharge and be controllable, thereby reducing the thermal effect brought by the pulse, highlighting the electric effect, achieving the decoupling of electricity and heat, and making the electroplasticity exploration process more clear.

[0059] At the same time, the temperature control is cooperated by the direct current and the peak value. Under the condition that the total power is constant, the power ratio of the direct current and the peak value is adjusted, and according to the ratio, the direct current thermal effect or the peak electric effect in the electroplasticity processing process can be amplified. For example, under the stable direct current temperature control, the peak pulse is superimposed (the temperature fluctuation is within an acceptable range), and the influence of the peak electric effect on the metal electroplasticity under the fixed temperature can be studied.

[0060] The following is a summary and explanation of this embodiment in conjunction with a specific application. The hybrid converter with metal electroplastic treatment proposed in this embodiment includes four parts: a phase-shifted full-bridge circuit, a rectifier and filter circuit, a pulse generator circuit, and a bootstrap clamping power supply circuit. Among them, the phase-shifted full-bridge circuit and the rectifier and filter circuit are the DC thermal effect output terminals, while the pulse generator and bootstrap clamping power supply circuit highlight the influence of the pulse electrical effect.

[0061] The DC output side consists of a full-bridge inverter circuit and a rectifier and filter circuit. The full-bridge inverter circuit uses SiC MOSFETs as switching devices and the output DC current is used as the control parameter. Precise control of the output current is achieved by adjusting the phase angle of the inverter circuit. This DC-side circuit structure can adapt to the power supply stability requirements of different pulse rise rates and can achieve constant DC output over a wide input voltage range.

[0062] The peak pulse side consists of a pulse generation circuit and a bootstrap clamping power supply circuit, with SiC MOSFETs used as the switching devices. The pulse generation circuit employs a full-bridge structure: switches 1 and 4 control the width and peak value of the pulse current; switches 2 and 3 provide a freewheeling path. With the introduction of the bootstrap clamping power supply circuit, the circuit's discharge speed is no longer limited by the voltage source, significantly improving the discharge slope, especially at lower input voltages.

[0063] Furthermore, the bootstrap clamping power supply circuit allows for adjustment of the clamping voltage by regulating the capacitor and inductor parameters, thereby controlling the discharge rate. During the pulse generation phase, energy feedback can be achieved by turning on the corresponding switching transistors to reduce losses. Simultaneously, the power supply level can be adjusted by controlling the on / off state of the switching transistors in the control circuit, thus flexibly controlling the magnitude of the clamping voltage.

[0064] Accordingly, the present invention also provides a current control output method and a coordinated temperature control method suitable for DC-DC peak pulse converters. The main implementation process of this method includes: The current output control comprises two parts: the DC side and the peak pulse side. The DC side control uses the output current of the rectifier-filter circuit as closed-loop feedback. This feedback is compared with a set DC reference value to generate an error signal, which is then processed by a PI regulator. Finally, the DC output current is controlled by adjusting the phase shift angle of the inverter circuit. The peak pulse side employs a similar control strategy: the peak output current of the pulse generator circuit is used as feedback. After the same closed-loop regulation, the peak pulse current is adjusted by controlling the on-time of switches 1 and 4. Both parts work together to achieve a hybrid regulation of DC thermal effects and peak pulse electrical effects.

[0065] In coordinated temperature control, the output power of both the DC and peak pulse components needs to be adjusted simultaneously. For example, it is known that the thermal power required to maintain a certain metal material at 1000°C is 500W. By pre-measuring the load resistance and line inductance parameters, the corresponding output voltage can be calculated on the DC side based on the controlled output current, thus obtaining the real-time output power on the DC side. For the peak pulse side, its output power needs to be calculated separately for the current rise and fall stages: given the load resistance and inductance, the required rise pulse width can be determined based on the target peak current and input voltage; simultaneously, the fall pulse width can be determined using the reverse discharge voltage set by the bootstrap clamp power supply circuit; combined with the pulse repetition frequency, the average power of the peak pulse component can be calculated using the current square integral method. By combining the power calculation results from both the DC and pulse sides, coordinated temperature control of the metal material can be achieved.

[0066] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The topology proposed in this invention can flexibly output arbitrary combinations of DC and peak current waveforms, making it suitable for studying the respective effects of thermal and electrical effects in the electroplastic processing of metals. This structure can be used to study DC processing methods dominated by pure thermal effects, as well as to explore the high-energy pulse processing mechanism dominated by electrical effects, and also supports the analysis of the combined effects of the two. 2. To overcome the pulse tailing phenomenon caused by stray line parameters and to solve the problem of turn-off time being limited by power supply voltage in traditional full-bridge pulse generation circuits, this invention introduces an improved bootstrap clamping energy feeding circuit. This circuit utilizes internally stored energy to provide a clamping voltage higher than the input voltage during the turn-off phase, thereby accelerating the turn-off process. Its effect is unaffected by the power supply voltage, and the improvement is particularly significant under low-voltage input conditions. Furthermore, this circuit can also achieve energy feedback during the pulse generation phase, helping to reduce system losses. 3. Regarding temperature control, this invention achieves precise control of the load temperature by synergistically adjusting the combined output power of DC and pulse. Specifically, the DC side controls its output power by adjusting the phase shift angle of the inverter circuit; the pulse peak side controls the power injected by the pulse by adjusting the pulse peak value and repetition frequency. Overall temperature control must ensure that the total output power remains essentially constant, while the power distribution between the DC and pulse peak components can be dynamically and synergistically adjusted according to process requirements.

[0067] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, modifications or equivalent replacements of the technical solutions described in the foregoing embodiments can still be made by those skilled in the art, or some technical features can be replaced by equivalent features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hybrid transformer for metal electroplastic processing, characterized by, Including phase-shift full-bridge circuit, rectification filter circuit, pulse generation circuit and bootstrap clamp feeding circuit;Among them: the phase-shift full-bridge circuit is connected with the rectification filter circuit through the transformer, and together constitutes the DC output side;The peak pulse side is divided into the pulse generation circuit of the current rising stage, and the bootstrap clamp feeding circuit controlled by the falling stage, which together constitute.

2. The mixed transducer of metal electroplastic processing according to claim 1, characterized in that, The phase-shift full-bridge inverter circuit comprises diodes , capacitors , switching tubes , switching tubes , switching tubes , switching tubes , capacitors , capacitors , capacitors , capacitors and inductors ; wherein: the diodes and the capacitors are input parts of the inverter circuit; the switching tubes to constitute a full-bridge inverter circuit, and the capacitors to are connected in parallel respectively, the inductor is connected in series with a primary-side transformer, so that the inductor and the parallel capacitors of the switching constitute a soft switching.

3. The mixed transducer of metal electroplastic processing according to claim 1, characterized in that, The rectifier filter circuit includes diodes ,diode ,diode ,inductance and capacitor Among them: diodes and Construct a full-wave rectifier circuit, with a series inductor and parallel capacitors A diode is connected in series at the output terminal. This makes the output current on each side relatively independent.

4. The mixed transducer of metal electroplastic processing according to claim 1, characterized in that, The pulse generating circuit comprises a switch tube , a switch tube , a switch tube , a switch tube , a diode , a diode and a capacitor ; wherein: the switch tube to constitute a full-bridge pulse generating circuit, the output diode and the capacitor are connected in parallel to provide energy for the pulse peak, and the output series side diode makes the output current relatively independent.

5. The mixed transducer of metal electroplastic processing according to claim 4, characterized in that, Boost clamping energy feeding circuit comprising a diode a diode an inductor a switch tube and a capacitor ; wherein: the diode the inductor the switch tube and the capacitor are connected in series, and the diode is connected in parallel between the inductor and the switch tube .

6. The metal electro-plasticity treated hybrid inverter of claim 1, wherein, Metallic material and stray inductance include inductance and resistance ; wherein: inductance and resistance are expressed in series structure, representing actual load conditions.

7. The metal electro-plasticity treated hybrid inverter of claim 2, wherein, The DC output side is provided with a corresponding control method, including: The output current of the rectifying and filtering circuit is collected as feedback to the set dc output size The difference is made, and is transmitted to the preset proportional integral module, and is limited after the dead zone, moving and taking the opposite control of the four switch tubes of the full-bridge inverter circuit to , the control of the output circuit is carried out.

8. The metal electro-plasticity treated hybrid transformer of claim 5, wherein, The pulse peak side is provided with a corresponding control method, including: The rising stage is to collect the peak current value The difference between the set peak value is sent into the proportional integral module, and the switch tube is controlled according to the pulse width of the switch tube , so as to adjust the size of the output peak value, and the capacitor voltage is adjusted according to the on-off state of the switch tube and the switch tube , the on-off time of the switch tube is adjusted to adjust the energy feedback amount, and the flexible control of the switch tube is carried out.

9. A method for synergistic temperature control of a metal electroplasticity- treated hybrid inverter using the metal electroplasticity-treated hybrid inverter according to any one of claims 1 to 8, characterized in that, The hybrid converter is provided with a corresponding cooperative temperature control method, including: The direct current side is through collecting output current As the feedback control quantity, the direct current power is calculated in combination with the load parameter; the power calculation of the peak pulse side is performed respectively according to the rising stage and the falling stage, and the peak pulse power is obtained; The total power is the sum of the DC power and the peak pulse power; In total power control, when the peak pulse power is added, the DC power needs to be adjusted accordingly to make the total power stable at the set value The adjustment of the DC power is realized by controlling the phase angle of the phase-shift full-bridge circuit, and the adjustment of the peak pulse power is realized by changing the pulse frequency or adjusting the falling platform voltage to control the current falling rate.

10. The synergistic temperature controlled method of metal electro- plasticity processed hybrid inverter of claim 9, wherein, The calculation process of the peak pulse power is specifically based on the circuit inductance, input voltage, falling platform voltage, set peak current and pulse frequency, and the average power of this part is obtained by the current square integral method.

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