Large-wattage silicon carbide stand-alone power supply

Abstract

The utility model discloses a large-wattage silicon carbide stand-alone power supply, which comprises an alternating current-direct current conversion circuit, a switch transformation circuit, a transformation output circuit, a direct current voltage conversion circuit, a quick charge control circuit and a voltage feedback circuit, and is characterized in that input alternating current is converted into first direct current through the alternating current-direct current conversion circuit; the switch transformation circuit modulates the first direct current and outputs the first direct current in a transformation manner; the transformation output circuit carries out rectification and voltage stabilization on the output power supply and then outputs second direct current; the direct-current voltage conversion circuit converts the second direct current into third direct current; the quick charge control circuit is used for carrying out voltage regulation control and output control on the third direct current; the voltage feedback circuit outputs a feedback voltage to the switch transformation circuit under the control of the fast charge control circuit, and the switch transformation circuit performs transformation regulation and control output according to the feedback voltage. Therefore, a high-power power supply can be output to supply power to electronic equipment, and the silicon carbide switch tube is adopted as a voltage transformation modulation switch tube, so that the size of the power supply circuit can be reduced, and application requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially relates to a big wattage silicon carbide single machine power supply. BACKGROUND

[0002] With the development of science and technology, more and more electronic devices need to be charged by fast charging, and the charging power of fast charging equipment is relatively large, so the charger needs to support the requirement of large power output.

[0003] The output power of the existing fast charging power supply is relatively small. This is because the large power supply will cause the charger to be relatively large in size, which is inconvenient to carry. Therefore, the existing fast charging power supply will be more and more difficult to meet the large power supply requirements of electronic devices. SUMMARY

[0004] The utility model aims at at least one of the technical problems in the related art to some extent. Therefore, one purpose of the utility model is to provide a big wattage silicon carbide single machine power supply.

[0005] To achieve the above purpose, according to the big wattage silicon carbide single machine power supply of the utility model embodiment, comprising:

[0006] AC-DC conversion circuit, the AC-DC conversion circuit is used to convert input AC into first DC;

[0007] Switching voltage transformation circuit, the input end of the switching voltage transformation circuit is connected with the first DC output end, so as to modulate and transform the output of the first DC;

[0008] Voltage transformation output circuit, the voltage transformation output circuit is connected with the output end of the switching voltage transformation circuit, so as to rectify and stabilize the switching voltage transformation circuit modulation and voltage transformation output power, and output second DC;

[0009] DC voltage conversion circuit, the DC voltage conversion circuit is connected with the second DC output end, and the DC voltage conversion circuit is used to convert the second DC into third DC and output;

[0010] Fast charging control circuit, the fast charging control circuit is connected with the DC voltage conversion circuit respectively, so as to control and output the third DC;

[0011] Voltage feedback circuit, the voltage feedback circuit is connected with the fast charging control circuit and switching voltage transformation circuit respectively, so as to output feedback voltage to the switching voltage transformation circuit under the control of the fast charging control circuit, and the switching voltage transformation circuit is also used for voltage transformation control output according to the feedback voltage.

[0012] Further, according to one embodiment of the utility model, the switch transformer circuit further includes:

[0013] The transformer, one end of the primary coil T1A of the transformer is connected with the first direct current output end;

[0014] The silicon carbide switch tube Q1, the other end of the primary coil T1A of the transformer is connected to the drain of the silicon carbide switch tube Q1, and the source of the silicon carbide switch tube Q1 is connected with the first reference ground through the third resistance R35;

[0015] The power supply controller is used for outputting pulse signals to switch driving control the gate of the silicon carbide switch tube, and then pulse modulating transformer output is carried out on the first direct current through the transformer.

[0016] Further, according to one embodiment of the utility model, the switch transformer circuit further includes:

[0017] The switch tube driving circuit, the power supply controller is connected with the gate of the silicon carbide switch tube Q1 through the switch tube driving circuit, so as to convert the pulse signal output by the controller into the driving signal of the silicon carbide switch tube Q1.

[0018] Further, according to one embodiment of the utility model, the switch tube driving circuit includes:

[0019] The first diode D6, the anode of the first diode D6 is connected with the pulse signal output end of the power supply controller through the first resistance R18;

[0020] The first inductor L3, one end of the first inductor L3 is connected with the cathode of the first diode D6, the other end of the first inductor L3 is connected with the gate of the silicon carbide switch tube Q1, the gate of the silicon carbide switch tube Q1 is also connected with one end of the second resistance R28, the other end of the second resistance R28 is connected with the first reference ground through the third resistance R35;

[0021] The first triode Q6, the base of the first triode Q6 is connected with the anode of the first diode D6, the emitter of the first triode Q6 is connected with the cathode of the first diode D6, and the collector of the first triode Q6 is connected with the first reference ground through the third resistance R35.

[0022] Further, according to one embodiment of the utility model, the switch transformer circuit further includes a high-voltage starting circuit, the starting circuit provides starting power supply for the power supply controller, and the high-voltage starting circuit includes:

[0023] A first MOS tube Q7, a drain of the first MOS tube Q7 is connected with the first DC output end through a fourth resistor R23 and a fifth resistor R25, a gate of the first MOS tube Q7 is connected with the first DC output end through a sixth resistor R22 and a seventh resistor R27, and a source of the first MOS tube Q7 is connected with a power supply end of the power supply controller;

[0024] A first capacitor C11, the gate of the first MOS tube Q7 is also connected with a first reference ground through the first capacitor C11;

[0025] A second capacitor C18, the source of the first MOS tube Q7 is also connected with the first reference ground through the first capacitor C11.

[0026] Further, according to one embodiment of the utility model, the transformer output circuit comprises:

[0027] A third capacitor C1, one end of the third capacitor C1 is connected with one end of the secondary coil of the transformer, and the other end of the third capacitor C1 is connected with a second reference ground;

[0028] A rectifier MOS tube Q2, a drain of the rectifier MOS tube Q2 is connected with the other end of the secondary coil of the transformer, and a source of the rectifier MOS tube Q2 is connected with the other end of the third capacitor C1;

[0029] A rectifier controller, an output power supply detection end of the rectifier controller is connected with the one end of the third capacitor C1, and a synchronous detection end of the rectifier controller is connected with the other end of the secondary coil of the transformer through an eighth resistor R5;

[0030] A common mode inductor LF1, one end of the common mode inductor LF1 is connected with the one end of the third capacitor C1, and the other end of the common mode inductor LF1 is connected with a power supply input end of the DC voltage conversion circuit, so as to output second DC to the DC voltage conversion circuit.

[0031] Further, according to one embodiment of the utility model, the DC voltage conversion circuit comprises:

[0032] A DC voltage reduction controller;

[0033] A second MOS tube Q4, a drain of the second MOS tube Q4 is connected with a second DC output end of the transformer output circuit, and a gate of the second MOS tube Q4 is connected with a first pulse control end of the DC voltage reduction controller;

[0034] A third MOS tube Q2, a drain of the third MOS tube Q2 is connected with a source of the second MOS tube Q4, and a source of the third MOS tube Q2 is connected with a second reference ground;

[0035] a second inductor L1, one end of the second inductor L1 is connected with the source of the second MOS Q4, and the other end of the second inductor L1 is connected with the power output of the fast charging control circuit to output a third direct current to the fast charging control circuit;

[0036] a third capacitor C1, one end of the third capacitor C1 is connected with the other end of the second inductor L1, and the other end of the third capacitor C1 is connected with a second reference ground;

[0037] a ninth resistor R10A, one end of the ninth resistor R10A is connected with the other end of the second inductor L1, and the other end of the ninth resistor R10A is connected with the voltage feedback end of the direct current voltage reduction controller;

[0038] a tenth resistor R12, one end of the tenth resistor R12 is connected with the other end of the ninth resistor R10A, and the other end of the tenth resistor R12 is connected with the second reference ground.

[0039] Further, according to an embodiment of the utility model, the fast charging control circuit comprises:

[0040] a charging interface TYPE-C;

[0041] a fourth MOS Q3, the drain of the fourth MOS Q3 is connected with the third direct current output end, and the source of the fourth MOS Q3 is connected with the power end of the charging interface TYPE-C;

[0042] a fast charging controller, the switch control end of the fast charging controller is connected with the gate of the fourth MOS Q3;

[0043] an optical coupling, the voltage regulation control end of the fast charging controller is connected with the voltage feedback circuit through the optical coupling.

[0044] Further, according to an embodiment of the utility model, the large wattage silicon carbide single machine power supply further comprises an auxiliary power supply circuit, and the auxiliary power supply circuit comprises:

[0045] a second diode D9, the anode of the second diode D9 is connected with one end of the auxiliary coil of the transformer through an eleventh resistor R13, and the other end of the auxiliary coil is connected with a reference ground;

[0046] a fourth capacitor C6, one end of the fourth capacitor C6 is connected with the cathode of the second diode D9;

[0047] A second triode Q5, a cathode of the second triode Q5 is connected with a cathode of the second diode D9, and a collector of the second triode Q5 is also connected with a base of the second triode Q5 through a twelfth resistor R17;

[0048] A Zener diode ZD1, a cathode of the Zener diode ZD1 is connected with a base of the second triode Q5, and an anode of the Zener diode ZD1 is connected with a first reference ground;

[0049] A third diode D3, an anode of the third diode D3 is connected with an emitter of the second triode Q5, and a cathode of the third diode D3 is connected with a power supply end of the power supply controller;

[0050] A fifth capacitor C13, one end of the fifth capacitor C13 is connected with the cathode of the third diode D3, and the other end of the fifth capacitor C13 is connected with the first reference ground.

[0051] Further, according to one embodiment of the utility model, the voltage feedback circuit comprises:

[0052] A thirteenth resistor R2, one end of the thirteenth resistor R2 is connected with the anode of the third diode D3, and the other end of the thirteenth resistor R2 is connected with a collector of a light-sensitive triode end of the optocoupler;

[0053] A fourteenth resistor R10B, one end of the fourteenth resistor R10B is connected with an emitter of the light-sensitive triode end of the optocoupler, and the other end of the fourteenth resistor R10B is connected with the first reference ground;

[0054] A fourth MOS Q3, a gate of the fourth MOS Q3 is connected with the one end of the fourteenth resistor R10B through a fifteenth resistor R6, a source of the fourth MOS Q3 is connected with the first reference ground, and a drain of the fourth MOS Q3 is connected with a voltage feedback end of the power supply controller through a sixteenth resistor R4;

[0055] A seventeenth resistor R3, one end of the seventeenth resistor R3 is connected with the voltage feedback end of the power supply controller, and the other end of the seventeenth resistor R3 is connected with the first reference ground;

[0056] An eighteenth resistor R8, one end of the eighteenth resistor R8 is connected with the voltage feedback end of the power supply controller, and the other end of the eighteenth resistor R8 is connected with one end of an auxiliary coil of the transformer through a nineteenth resistor R9 and a twentieth resistor R11.

[0057] The large-wattage silicon carbide single-machine power supply provided by the embodiment of the utility model, through AC-DC conversion circuit is used for converting input AC into first DC; the switch transformer circuit modulates and transforms the first DC to output; the voltage feedback circuit outputs feedback voltage to the switch transformer circuit under the control of the fast charging control circuit, and the switch transformer circuit is also used for transforming and regulating output according to the feedback voltage. In this way, the large-power power supply can be output under the control of the fast charging control circuit to supply power to electronic equipment, and the silicon carbide switch tube is used as the transformer modulation switch tube, which can greatly reduce the size of the overall power supply circuit and meet the application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 The structure block diagram of the large-wattage silicon carbide single-machine power supply provided by the utility model is provided.

[0059] Figure 2 The structure schematic diagram of the switch transformer circuit, the voltage feedback circuit and the auxiliary power supply circuit provided by the utility model is provided.

[0060] Figure 3 The structure schematic diagram of the voltage feedback circuit provided by the utility model is provided.

[0061] Figure 4 The structure schematic diagram of the voltage feedback circuit provided by the utility model is provided.

[0062] Figure 5 The structure schematic diagram of the fast charging control circuit provided by the utility model is provided.

[0063] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0064] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Unless otherwise defined, all the technical and scientific terms used in the text are the same as the meanings understood by the personnel in the technical field of the utility model. The terms used in the specification of the utility model in the text are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model.

[0065] Reference to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0066] With reference to Figures 1 to 5 The embodiment of the application provides a large-wattage silicon carbide single-machine power supply, which comprises an AC-DC conversion circuit, a switching voltage transformation circuit, a voltage transformation output circuit, a DC voltage conversion circuit, a fast charging control circuit and a voltage feedback circuit. The AC-DC conversion circuit is used for converting input AC power into first DC power. The input end of the switching voltage transformation circuit is connected with the first DC power output end, so that the first DC power is modulated and voltage-transformed. The voltage transformation output circuit is connected with the output end of the switching voltage transformation circuit, so that the modulated and voltage-transformed power of the switching voltage transformation circuit is rectified and stabilized, and second DC power is output. The DC voltage conversion circuit is connected with the second DC power output end. The DC voltage conversion circuit is used for converting the second DC power into third DC power and outputting. The fast charging control circuit is connected with the DC voltage conversion circuit, so as to control the third DC power in voltage and output. The voltage feedback circuit is connected with the fast charging control circuit and the switching voltage transformation circuit, so as to output feedback voltage to the switching voltage transformation circuit under the control of the fast charging control circuit. The switching voltage transformation circuit is also used for voltage transformation and output control according to the feedback voltage.

[0067] Specifically, the working process of the large wattage silicon carbide single machine power supply is that the city power alternating current can be connected through the AC / DC conversion circuit. For example, 220V city power alternating current is connected. And through the rectifier bridge and the filter capacitor, the first direct current with a relatively high voltage, for example, 311V high voltage direct current, can be converted. The voltage of the first direct current is relatively high and cannot be directly output as power supply for the load. Therefore, the first direct current needs to be pulse width modulated and output after voltage transformation through the switching transformer circuit. After voltage transformation, the pulse width modulated power output by the voltage transformation output circuit is filtered and stabilized, and the second direct current with a lower voltage value is output. In some fast charging applications, the voltage value of the second direct current output by the voltage transformation output circuit may not meet the fast charging voltage requirement. The fast charging control circuit can control the direct current voltage conversion circuit to output the third direct current with a voltage value meeting the fast charging requirement according to the output voltage requirement. At the same time, the fast charging control circuit controls the output of the third direct current. When the charging of the electric device is completed, the output of the third direct current is disconnected to ensure the stability of the fast charging power supply. In addition, the fast charging control circuit can feed back the control signal to the voltage feedback circuit through the optocoupler, output the feedback voltage signal to the switching transformer circuit through the voltage feedback circuit, and output the corresponding PWM pulse width modulation signal according to the feedback voltage signal to realize pulse width modulation of the first direct current, so as to realize output control of the second direct current voltage value, and further make the output of the second direct current and the third direct current meet the fast charging requirement. In this way, the fast charging control circuit can control the output of the high-power power supply to supply power to the electronic device.

[0068] Referring to Figure 2 , the switching transformer circuit comprises a transformer, a silicon carbide switch tube Q1 and a power supply controller. One end of a primary coil T1A of the transformer is connected with the first direct current output end. The drain of the silicon carbide switch tube Q1 is connected to the other end of the primary coil T1A of the transformer, and the source of the silicon carbide switch tube Q1 is connected with the first reference ground through a third resistor R35. The power supply controller is used to output a pulse signal to switch and drive control the gate of the silicon carbide switch tube, and further pulse modulate and voltage transform the first direct current through the transformer.

[0069] Specifically, the silicon carbide switch tube Q1 can achieve a relatively fast switching frequency. In turn, the overall volume of the transformer and the filter capacitor can be reduced, and ultimately the overall volume of the circuit can be reduced, so that the overall volume of the power supply is smaller. The working process of the switching transformer circuit is that the power supply controller U3 can output a PWM pulse width modulation signal, which can control the conduction or cutoff of the silicon carbide switch tube Q1. When the output PWM pulse width modulation signal is in a high level state, the silicon carbide switch tube Q1 is turned on. At this time, the first direct current charges the primary coil T1A of the transformer. In a time period, when the PWM pulse width modulation signal is converted from high level to low level, the silicon carbide switch tube Q1 is in the cutoff state. At this time, the primary coil T1A charges the primary coil T1A through the secondary coil. The modulated transformer output is output to the transformer output circuit for rectification output, thereby outputting the second direct current. Using silicon carbide switch tube as the transformer modulation switch tube can greatly reduce the volume of the overall power supply circuit, meeting the application requirements.

[0070] Referring to Figure 2 , the switching transformer circuit further comprises a switch tube driving circuit, the power supply controller is connected with the gate of the silicon carbide switch tube Q1 through the switch tube driving circuit, so as to convert the pulse signal output by the controller into the driving signal of the silicon carbide switch tube Q1. Because the current of the primary coil T1A of the transformer is relatively large during the charging process, a large driving current is required to quickly turn on or turn off the silicon carbide switch tube Q1. The switch tube driving circuit can convert the control signal of the controller into the corresponding driving signal, thereby realizing the fast driving control of the conduction or cutoff of the silicon carbide switch tube Q1.

[0071] Specifically, as shown in Figure 2 , the switch tube driving circuit comprises a first diode D6, a first inductor L3 and a first triode Q6. The anode of the first diode D6 is connected with the pulse signal output end of the power supply controller through a first resistor R18. One end of the first inductor L3 is connected with the cathode of the first diode D6, and the other end of the first inductor L3 is connected with the gate of the silicon carbide switch tube Q1. The gate of the silicon carbide switch tube Q1 is also connected with one end of a second resistor R28, and the other end of the second resistor R28 is connected with a first reference ground through a third resistor R35. The base of the first triode Q6 is connected with the anode of the first diode D6, the emitter of the first triode Q6 is connected with the cathode of the first diode D6, and the collector of the first triode Q6 is connected with the first reference ground through the third resistor R35.

[0072] As Figure 2As shown in FIG. 6, when the PWM modulation signal output by the controller is at a high level, the high level signal is output to the gate of the silicon carbide switch Q1 through the first diode D6 and the first inductor L3, so that the silicon carbide switch Q1 can be driven to be turned on, and in this process, the current of the silicon carbide switch Q1 gradually increases along with the primary coil T1A of the transformer. When it is needed to turn off the silicon carbide switch Q1, the controller can output a low level signal, the low level signal can make the first triode Q6 be turned on, the gate of the silicon carbide switch Q1 can be quickly discharged through the first inductor L3 and the first triode Q6, and then the silicon carbide switch Q1 is quickly turned off. In this way, the driving of the silicon carbide switch Q1 is realized.

[0073] Referring to Figure 2 , the switching transformer circuit further comprises a high-voltage starting circuit, the starting circuit provides a starting power supply for the power controller U3, and the high-voltage starting circuit comprises a first MOS tube Q7, a first capacitor C11 and a second capacitor C18, the drain of the first MOS tube Q7 is connected with the first DC output end through a fourth resistor R23 and a fifth resistor R25, the gate of the first MOS tube Q7 is connected with the first DC output end through a sixth resistor R22 and a seventh resistor R27, and the source of the first MOS tube Q7 is connected with the power supply end of the power controller; the gate of the first MOS tube Q7 is further connected with the first reference ground through the first capacitor C11; and the source of the first MOS tube Q7 is further connected with the first reference ground through the first capacitor C11.

[0074] Since the power controller U3 needs to be powered on before starting to work, in order to reduce the additional power supply circuit, in the embodiment of the utility model, the starting circuit is used to provide a starting power supply for the power controller U3, so as to reduce the overall volume of the power supply and reduce the cost. As shown in FIG. Figure 2 , after the AC-DC conversion circuit is connected to the commercial AC power, the first DC can act on the gate of the first MOS tube Q7 through the seventh resistor R27 and the sixth resistor R22, so that the first MOS tube Q7 can be turned on, and after the first MOS tube Q7 is turned on, the first DC can charge the second capacitor C18 through the first MOS tube Q7. When the second capacitor C18 rises to a certain voltage value, the power controller U3 can be started. In this way, the additional transformer circuit can be used to supply power for the starting of the power controller U3.

[0075] As shown in Figure 2 , the switching transformer circuit can further comprise a primary coil spike absorption circuit, and the spike signal generated by the primary coil of the transformer can be absorbed through the primary coil spike absorption circuit, so as to avoid damaging the silicon carbide switch Q1.

[0076] Referring to Figure 3The transformer output circuit comprises a third capacitor C1, a rectifier MOS tube Q2, a rectifier controller and a common mode inductor LF1. One end of the third capacitor C1 is connected with one end of a secondary coil of the transformer, and the other end of the third capacitor C1 is connected with a second reference ground. The drain of the rectifier MOS tube Q2 is connected with the other end of the secondary coil of the transformer, and the source of the rectifier MOS tube Q2 is connected with the other end of the third capacitor C1. The output power supply detection end of the rectifier controller is connected with the one end of the third capacitor C1, and the synchronous detection end of the rectifier controller is connected with the other end of the secondary coil of the transformer through an eighth resistor R5. One end of the common mode inductor LF1 is connected with the one end of the third capacitor C1, and the other end of the common mode inductor LF1 is connected with a power input end of the direct current voltage conversion circuit, so as to output a second direct current to the direct current voltage conversion circuit.

[0077] As shown in Figure 3 The working process of the transformer output circuit is that the transformer power supply output can be output through the secondary coil of the transformer. The peak signal generated by the secondary coil of the transformer can be absorbed through the secondary coil peak absorption circuit, so as to avoid damaging the rectifier MOS tube Q2. The rectifier MOS tube Q2 is turned on or turned off under the action of the rectifier controller U2, so as to rectify the transformer power supply output by the secondary coil of the transformer, and then filter through the third capacitor C1, so as to output the stable second direct current Vo. The second direct current Vo can be output to the direct current voltage conversion circuit through the common mode inductor LF1. The third capacitor C1 can be provided with a plurality of capacitors according to the need of filter capacity. For example Figure 3 The third capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 in The rectifier MOS tube Q2 can also be provided with a plurality of rectifier MOS tubes according to the size of the current. For example Figure 3 The rectifier MOS tube Q2 and the rectifier second MOS tube Q4 in

[0078] Referring to Figure 4The direct current voltage conversion circuit comprises a direct current voltage reduction controller, a second MOS tube Q4, a third MOS tube Q2, a second inductor L1, a third capacitor C1, a ninth resistor R10A and a tenth resistor R12. The drain of the second MOS tube Q4 is connected with the second direct current output end of the voltage transformation output circuit, and the gate of the second MOS tube Q4 is connected with the first pulse control end of the direct current voltage reduction controller. The drain of the third MOS tube Q2 is connected with the source of the second MOS tube Q4, and the source of the third MOS tube Q2 is connected with the second reference ground. One end of the second inductor L1 is connected with the source of the second MOS tube Q4, and the other end of the second inductor L1 is connected with the power output of the fast charging control circuit, so as to output the third direct current power to the fast charging control circuit. One end of the third capacitor C1 is connected with the other end of the second inductor L1, and the other end of the third capacitor C1 is connected with the second reference ground. One end of the ninth resistor R10A is connected with the other end of the second inductor L1, and the other end of the ninth resistor R10A is connected with the voltage feedback end of the direct current voltage reduction controller. The tenth resistor R12, one end of the tenth resistor R12 is connected with the other end of the ninth resistor R10A, and the other end of the tenth resistor R12 is connected with the second reference ground.

[0079] Specifically, the direct current voltage conversion circuit constitutes a voltage reduction circuit. The working process is that the direct current voltage reduction controller U1 can control the complementary conduction or cut-off of the second MOS tube Q4 and the third MOS tube Q2. When the second MOS tube Q4 is turned on and the third MOS tube Q2 is turned off, the second power supply is output to the second inductor L1 and the third capacitor C1 through the second MOS tube Q4, so as to charge the second inductor L1 and the third capacitor C1. When the charging reaches a certain state, the direct current voltage reduction controller U1 outputs an inverse signal, and then controls the second MOS tube Q4 to be cut off and the third MOS tube Q2 to be turned on. At this time, the second inductor L1 can continue to discharge through the third MOS tube Q2, and at the same time, continue to supplement the electric quantity of the third capacitor C1. In a cycle, the ratio D of the conduction time / cycle of the second MOS tube Q4 is proportional to the output voltage of the third capacitor C1. In this way, the second direct current can be reduced to the third direct current VBUS. The fourteenth resistor R10B and the tenth resistor R12 constitute a voltage division circuit, which can divide the third direct current VBUS and then feedback to the voltage feedback end of the direct current voltage reduction controller.

[0080] As Figure 4As shown in the middle, the direct current voltage conversion circuit further comprises a voltage regulating circuit, the voltage regulating circuit comprises a transistor Q1, the base of the transistor Q1 is connected with the voltage regulating control end of the fast charging control circuit through the twentieth resistor R11, the base of the transistor Q1 is also connected with the third direct current VBUS output end through the seventeenth resistor R3, the emitter of the transistor Q1 is connected with the third direct current VBUS output end through the thirteenth resistor R2, and the collector of the transistor Q1 is connected with the voltage feedback end FB of the direct current voltage reduction controller U1. In this way, the fast charging control circuit can output a voltage regulating signal through the IVFB signal end, so that the transistor Q1 is turned on, thereby connecting the current channel composed of the thirteenth resistor R2 and the transistor Q1 in parallel with the thirteenth resistor R2, and connecting the thirteenth resistor R2 and the tenth resistor R12 to form a voltage dividing circuit, so that the output of the third direct current voltage can be regulated and controlled.

[0081] Referring to Figure 5 , the fast charging control circuit comprises a charging interface TYPE-C, a fourth MOS tube Q3, a fast charging controller and an optical coupler, the drain of the fourth MOS tube Q3 is connected with the third direct current power supply output end, and the source of the fourth MOS tube Q3 is connected with the power supply end of the charging interface TYPE-C; the switch control end of the fast charging controller is connected with the gate of the fourth MOS tube Q3; and the voltage regulating control end of the fast charging controller is connected with the voltage feedback circuit through the optical coupler. The fast charging controller U3 can communicate with an external communication device, so as to control the output power supply voltage of the direct current voltage conversion circuit and the voltage feedback circuit according to the voltage requirement of the external device, wherein the control signal is fed back to the voltage feedback circuit through the optical coupler U1A. When charging or supplying power for the external charging device, the fourth MOS tube Q3 is controlled to be turned on, the Vout-C+ signal end and the charging interface TYPE-C are used to output power supply to charge or supply power for the external device. Otherwise, the fourth MOS tube Q3 can be controlled to be cut off, so as to stop supplying power externally.

[0082] Referring to Figure 1 and Figure 2The large wattage silicon carbide single machine power supply further comprises an auxiliary power supply circuit, the auxiliary power supply circuit comprising: a second diode D9, a fourth capacitor C6, a second triode Q5, a voltage stabilizing diode ZD1, a third diode D3 and a fifth capacitor C13, an anode of the second diode D9 being connected with one end of an auxiliary coil of the transformer through an eleventh resistor R13, the other end of the auxiliary coil being connected with a reference ground; one end of the fourth capacitor C6 being connected with a cathode of the second diode D9; a collector of the second triode Q5 being connected with the cathode of the second diode D9, the collector of the second triode Q5 further being connected with a base of the second triode Q5 through a twelfth resistor R17; a cathode of the voltage stabilizing diode ZD1 being connected with the base of the second triode Q5, an anode of the voltage stabilizing diode ZD1 being connected with a first reference ground; an anode of the third diode D3 being connected with an emitter of the second triode Q5, a cathode of the third diode D3 being connected with a power supply end of the power supply controller; one end of the fifth capacitor C13 being connected with the cathode of the third diode D3, the other end of the fifth capacitor C13 being connected with the first reference ground.

[0083] Specifically, after the power supply controller U3 is started, subsequent power supply can supply power to the power supply controller U3 through the auxiliary power supply circuit. The working process is that the power supply voltage of the primary coil of the transformer can be transformed and output through the auxiliary coil T1E of the transformer, and then input to the fourth capacitor C6 after rectification through the second diode D9, and then output to the collector and base of the second triode Q5 after filtering through the fourth capacitor C6, so that the second triode Q5 is turned on, and the power supply controller U3 is supplied with power through the third diode D3. Since the power supply voltage after filtering through the fourth capacitor C6 may fluctuate, the voltage output by the second triode Q5 can be further stabilized and controlled through the voltage stabilizing diode ZD1, so that the output power supply VCC is a stable voltage value. The stability of the output power supply VCC can be further guaranteed through the fifth capacitor C13, so as to provide the controller U3 with stable power supply.

[0084] Referring to Figure 1 , Figure 2 and Figure 5The voltage feedback circuit comprises a thirteenth resistor R2, a fourteenth resistor R10B, a fourth MOS tube Q3, a seventeenth resistor R3 and an eighteenth resistor R8. One end of the thirteenth resistor R2 is connected with the anode of the third diode D3, and the other end of the thirteenth resistor R2 is connected with the collector of the light-sensitive triode end of the optocoupler. One end of the fourteenth resistor R10B is connected with the emitter of the light-sensitive triode end of the optocoupler, and the other end of the fourteenth resistor R10B is connected with the first reference ground. The gate of the fourth MOS tube Q3 is connected with the one end of the fourteenth resistor R10B through a fifteenth resistor R6, the source of the fourth MOS tube Q3 is connected with the first reference ground, and the drain of the fourth MOS tube Q3 is connected with the voltage feedback end of the power supply controller U3 through a sixteenth resistor R4. One end of the seventeenth resistor R3 is connected with the voltage feedback end of the power supply controller U3, and the other end of the seventeenth resistor R3 is connected with the first reference ground. One end of the eighteenth resistor R8 is connected with the voltage feedback end of the power supply controller, and the other end of the eighteenth resistor R8 is connected with one end of the auxiliary coil of the transformer through a nineteenth resistor R9 and a twentieth resistor R11.

[0085] As shown in Figure 2 The twentieth resistor R11, the nineteenth resistor R9, the eighteenth resistor R8 and the seventeenth resistor R3 constitute a voltage dividing circuit, and the voltage of the auxiliary coil of the transformer is divided and then fed back to the voltage feedback end of the power supply controller U3. When it is necessary to adjust the output second voltage DC, the fast charging control circuit can change the voltage value fed back to the voltage feedback end of the power supply controller U3 through the output control signal.

[0086] For example, under the control of the fast charging control circuit, the light-sensitive triode end of the optocoupler U1B can be turned on or turned off. When the light-sensitive triode end of the optocoupler U1B is turned on, the output power supply OUT-CH can be divided through the thirteenth resistor R2 and the fourteenth resistor R10B, and then output to the gate of the fourth MOS tube Q3 through the diode D2, so that the fourth MOS tube Q3 is turned on, and one end of the sixteenth resistor R4 is connected to the first reference ground. In this way, the sixteenth resistor R4 and the seventeenth resistor R3 constitute a parallel circuit, so as to change the feedback value of the feedback voltage and realize the control of the second DC output voltage.

[0087] The above are only embodiments of the present application, but do not limit the patent range of the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace part of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, are also within the protection scope of the present application.

[0088] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A high wattage silicon carbide power supply, comprising: a silicon carbide power transistor; a silicon carbide diode; and a silicon carbide rectifier. The application relates to a power supply device, which comprises: an AC-DC conversion circuit for converting input AC power into first DC power; a switching transformer circuit, the input end of which is connected with the first DC power output end, so as to modulate and transform the first DC power and output the same; a transformer output circuit, which is connected with the output end of the switching transformer circuit, so as to rectify and stabilize the modulated and transformed power output by the switching transformer circuit, and then output second DC power; a DC voltage conversion circuit, which is connected with the second DC power output end, and is used for converting the second DC power into third DC power and outputting the same; a fast charging control circuit, which is connected with the DC voltage conversion circuit, so as to control and output the third DC power; a voltage feedback circuit, which is connected with the fast charging control circuit and the switching transformer circuit, so as to output feedback voltage to the switching transformer circuit under the control of the fast charging control circuit, and the switching transformer circuit is also used for transforming and regulating the output according to the feedback voltage.

2. The high wattage silicon carbide power supply of claim 1, wherein, The switching transformer circuit comprises: a transformer, one end of the primary coil (T1A) of which is connected with the first DC power output end; a silicon carbide switch tube (Q1), the drain of which is connected with the other end of the primary coil (T1A) of the transformer, and the source of which is connected with a first reference ground through a third resistor (R35); a power supply controller, which is used for outputting pulse signals to switchingly drive and control the gate of the silicon carbide switch tube (Q1), so as to pulse-modulate and transform the first DC power through the transformer.

3. The high wattage silicon carbide power cell of claim 2, wherein, The switching transformer circuit further comprises: a switch tube driving circuit, through which the power supply controller is connected with the gate of the silicon carbide switch tube (Q1), so as to convert the pulse signals output by the controller into the driving signals of the silicon carbide switch tube (Q1).

4. The high wattage silicon carbide power cell of claim 3, wherein, The switch tube driving circuit comprises: a first diode (D6), the anode of which is connected with the pulse signal output end of the power supply controller through a first resistor (R18); a first inductor (L3), one end of which is connected with the cathode of the first diode (D6), and the other end of which is connected with the gate of the silicon carbide switch tube (Q1), and the gate of the silicon carbide switch tube (Q1) is also connected with one end of a second resistor (R28), and the other end of the second resistor (R28) is connected with the first reference ground through the third resistor (R35); a first triode (Q6), the base of which is connected with the anode of the first diode (D6), the emitter of which is connected with the cathode of the first diode (D6), and the collector of which is connected with the first reference ground through the third resistor (R35).

5. The high wattage silicon carbide unipolar power supply of claim 2, wherein, The switching transformer circuit further comprises a high-voltage starting circuit, the starting circuit provides a starting power supply for the power supply controller, the high-voltage starting circuit comprises: A first MOS tube (Q7), the drain of the first MOS tube (Q7) is connected to the first DC output end through a fourth resistor (R23) and a fifth resistor (R25), the gate of the first MOS tube (Q7) is connected to the first DC output end through a sixth resistor (R22) and a seventh resistor (R27), and the source of the first MOS tube (Q7) is connected to the power supply end of the power supply controller; A first capacitor (C11), the gate of the first MOS tube (Q7) is further connected to the first reference ground through the first capacitor (C11); A second capacitor (C18), the source of the first MOS tube (Q7) is further connected to the first reference ground through the first capacitor (C11).

6. The high wattage silicon carbide power cell of Claim 2, wherein, The transformer output circuit comprises: A third capacitor (C1), one end of the third capacitor (C1) is connected to one end of the secondary coil of the transformer, and the other end of the third capacitor (C1) is connected to a second reference ground; A rectifier MOS tube (Q2), the drain of the rectifier MOS tube (Q2) is connected to the other end of the secondary coil of the transformer, and the source of the rectifier MOS tube (Q2) is connected to the other end of the third capacitor (C1); A rectifier controller, the output power supply detection end of the rectifier controller is connected to the one end of the third capacitor (C1), and the synchronous detection end of the rectifier controller is connected to the other end of the secondary coil of the transformer through an eighth resistor (R5); A common mode inductor (LF1), one end of the common mode inductor (LF1) is connected to the one end of the third capacitor (C1), and the other end of the common mode inductor (LF1) is connected to the power input end of the DC voltage conversion circuit, so as to output a second DC to the DC voltage conversion circuit.

7. The high wattage silicon carbide power cell of Claim 2, wherein, The DC voltage conversion circuit comprises: A DC voltage reduction controller; A second MOS tube (Q4), the drain of the second MOS tube (Q4) is connected to the second DC output end of the transformer output circuit, and the gate of the second MOS tube (Q4) is connected to the first pulse control end of the DC voltage reduction controller; A third MOS tube (Q2), the drain of the third MOS tube (Q2) is connected to the source of the second MOS tube (Q4), and the source of the third MOS tube (Q2) is connected to a second reference ground; A second inductor (L1), one end of the second inductor (L1) is connected to the source of the second MOS tube (Q4), and the other end of the second inductor (L1) is connected to the power output of the fast charging control circuit, so as to output a third DC power to the fast charging control circuit; A third capacitor (C1), one end of the third capacitor (C1) is connected to the other end of the second inductor (L1), and the other end of the third capacitor (C1) is connected to a second reference ground; A ninth resistor (R10A) has one end connected to the other end of the second inductor (L1), and the other end connected to a voltage feedback end of the DC voltage reduction controller; A tenth resistor (R12) has one end connected to the other end of the ninth resistor (R10A), and the other end connected to the second reference ground.

8. The high wattage silicon carbide power cell of claim 7, wherein, The fast charging control circuit comprises: A charging interface (TYPE-C); A fourth MOS tube (Q3) has a drain connected to the third DC power supply output end, and a source connected to a power supply end of the charging interface (TYPE-C); A fast charging controller has a switch control end connected to a gate of the fourth MOS tube (Q3); An optocoupler has a voltage regulation control end of the fast charging controller connected to the voltage feedback circuit through the optocoupler.

9. The high wattage silicon carbide power cell of claim 8, wherein, An auxiliary power supply circuit is further included, and the auxiliary power supply circuit comprises: A second diode (D9) has an anode connected to one end of an auxiliary coil of the transformer through an eleventh resistor (R13), and the other end of the auxiliary coil connected to a reference ground; A fourth capacitor (C6) has one end connected to a cathode of the second diode (D9); A second triode (Q5) has a collector connected to the cathode of the second diode (D9), and the collector further connected to a base of the second triode (Q5) through a twelfth resistor (R17); A voltage stabilizing diode (ZD1) has a cathode connected to the base of the second triode (Q5), and an anode connected to a first reference ground; A third diode (D3) has an anode connected to an emitter of the second triode (Q5), and a cathode connected to a power supply end of the power supply controller; A fifth capacitor (C13) has one end connected to the cathode of the third diode (D3), and the other end connected to the first reference ground.

10. The high wattage silicon carbide power cell of Claim 9, wherein, The voltage feedback circuit comprises: A thirteenth resistor (R2) has one end connected to the anode of the third diode (D3), and the other end connected to a collector of a light-sensitive triode end of the optocoupler; A fourteenth resistor (R10B) has one end connected to an emitter of the light-sensitive triode end of the optocoupler, and the other end connected to the first reference ground. A fourth MOS transistor (Q3), a gate of the fourth MOS transistor (Q3) is connected with the one end of the fourteenth resistor (R10B) through a fifteenth resistor (R6), a source of the fourth MOS transistor (Q3) is connected with a first reference ground, a drain of the fourth MOS transistor (Q3) is connected with a voltage feedback end of the power supply controller through a sixteenth resistor (R4); A seventeenth resistor (R3), one end of the seventeenth resistor (R3) is connected with the voltage feedback end of the power supply controller, the other end of the seventeenth resistor (R3) is connected with the first reference ground; An eighteenth resistor (R8), one end of the eighteenth resistor (R8) is connected with the voltage feedback end of the power supply controller, the other end of the eighteenth resistor (R8) is connected with one end of the auxiliary coil of the transformer through a nineteenth resistor (R9) and a twentieth resistor (R11).

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