CN218449868U - Silicon carbide high-efficiency power supply - Google Patents

Abstract

The utility model discloses a carborundum high efficiency power supply, including alternating current-direct current converting circuit, transformer, controller and output rectification filter circuit, through being equipped with drive module and carborundum switch tube in the controller, the drain electrode of carborundum switch tube is connected with the other end of the primary coil of transformer, and the source electrode of carborundum switch tube is connected with reference ground, and drive module's PWM signal output part is connected with the grid of carborundum switch tube to carry out PWM modulation to the electric current of transformer primary coil through output PWM signal; the output rectifying and filtering circuit is connected with a secondary coil of the transformer so as to rectify and filter the PWM power supply signal output by the transformer into low-voltage direct current and output the low-voltage direct current. Therefore, by adopting the silicon carbide (SiC) as the switching tube, the switching tube has higher working temperature and better reliability, the working frequency can be doubled, and the power loss can be reduced. The size of the power supply circuit can be smaller and smaller, and therefore the cost of the whole circuit is reduced.

Description

Silicon carbide high-efficiency power supply

Technical Field

The utility model relates to a power supply circuit technical field especially relates to a carborundum high efficiency power.

Background

In the power supply circuit, the switching tube is a core device of the power supply circuit, and the switching tube is used for realizing on-off control of current on the transformer or the inductor. In the prior art, a MOS transistor is mainly used to control the on/off of a current. The existing MOS Transistor (MOSFET, metal Oxide Semiconductor Field Effect Transistor), is a Metal Oxide Semiconductor type Field Effect Transistor, and belongs to an insulated gate type Field Effect Transistor. The process comprises the steps of manufacturing two N + regions with high doping concentration on a P-type semiconductor silicon substrate with low doping concentration by semiconductor photoetching and diffusion processes, and leading out two electrodes by using metal aluminum to be respectively used as a drain D and a source S. Then, a thin silicon dioxide (Si 02) insulating film is covered on the surface of the P-type semiconductor between the drain electrode and the source electrode, and an aluminum electrode is arranged on the insulating film to be used as a grid electrode G. This constitutes an N-channel (NPN type) enhancement type MOS transistor. However, the conventional MOS transistor has a low operating frequency, which results in a large size of the entire power supply circuit and a high cost of the entire circuit.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses an aim at provides a carborundum high efficiency power.

In order to achieve the above object, an embodiment of the present invention provides a silicon carbide high efficiency power supply, including:

the alternating current-direct current conversion circuit is used for being connected with input alternating current so as to convert the input alternating current into high-voltage direct current;

one end of a primary coil of the transformer is connected with the high-voltage direct-current output end;

the controller is internally provided with a driving module and a silicon carbide switching tube, the drain electrode of the silicon carbide switching tube is connected with the other end of the primary coil of the transformer, the source electrode of the silicon carbide switching tube is connected with a reference ground, and the PWM signal output end of the driving module is connected with the grid electrode of the silicon carbide switching tube so as to perform PWM modulation on the current of the primary coil of the transformer by outputting a PWM signal;

and the output rectifying and filtering circuit is connected with the secondary coil of the transformer so as to carry out rectifying and filtering on the PWM power supply signal output by the transformer to low-voltage direct current and then output the low-voltage direct current.

Further, according to the utility model discloses an embodiment, still be equipped with cycle-by-cycle current-limiting protection module in the controller, cycle-by-cycle current-limiting protection module with the current detection end of controller is connected to during carborundum switch tube conduction at every turn, the maximum inductive current that flows through the switch tube is restricted.

Further, according to an embodiment of the present invention, a fault protection module is further disposed in the controller, and the fault protection module is connected to the driving module to output a fault signal to the driving module;

the fault protection module comprises a short-circuit protection module, and the short-circuit protection module is connected with the output end of the cycle-by-cycle current-limiting protection module to perform short-circuit protection.

Further, according to the utility model discloses an embodiment, silicon carbide high efficiency power still includes inhales the spike circuit, inhale the spike circuit be used for with the strong pulse signal that transformer primary coil produced absorbs, inhale the spike circuit and include:

a diode D2, an anode of the diode D2 being connected to the other end of the primary coil of the transformer;

one end of the capacitor C2 is connected with the cathode of the diode D2, and the other end of the capacitor C2 is connected with the one end of the transformer;

and one end of the resistor R3 is connected with the cathode of the diode D2, and the other end of the resistor R3 is connected with the one end of the transformer.

Further, according to the utility model discloses an embodiment, output rectification filter circuit includes:

a diode D3, an anode of the diode D3 being connected to one end of the secondary coil of the transformer;

and one end of the capacitor EC2 is connected with the cathode of the diode D3, and the other end of the capacitor EC2 is connected with the other end of the secondary coil.

Further, according to the utility model discloses an embodiment, carborundum high efficiency power still includes voltage feedback circuit, voltage feedback circuit be used for with the low pressure direct current feedback of output rectification filtering output extremely the controller, with pass through the controller carries out regulation control to PWM pulse voltage regulation signal, with the low pressure direct current is stabilized and is being set for the output voltage value.

Further, according to an embodiment of the present invention, the voltage feedback circuit includes:

one end of the resistor R4 is connected with the output end of the output rectifying and filtering circuit;

one end of the resistor R5 is connected with the other end of the resistor R4, and the other end of the resistor R5 is connected with a reference ground;

a voltage comparison end of the three-terminal comparator U2 is connected with the one end of the resistor R5, and an anode of the three-terminal comparator U2 is connected with a reference ground;

the optical coupler U3, the emitting diode positive pole end of optical coupler U3 pass through resistance R2 with output rectification filter circuit output is connected, the emitting diode negative pole end of optical coupler U3 with three terminal comparator U2's negative pole is connected, the triode transmitter of optical coupler U3 is connected with reference ground, the triode collector end of optical coupler U3 with the voltage feedback end of controller is connected.

Further, according to the utility model discloses an embodiment, carborundum high efficiency power still includes chip power supply circuit, chip power supply circuit be used for do the controller power supply, chip power supply circuit includes:

one end of the resistor R1 is connected with a power supply end of the alternating current-direct current conversion circuit;

one end of the capacitor C3 is connected with the other end of the resistor R1, and the other end of the capacitor C3 is connected with a reference;

and the anode of the diode D1 is connected with one end of an auxiliary coil of the transformer, the other end of the auxiliary coil is connected with the reference ground, and the cathode of the diode D1 is connected with the power supply end of the controller.

Further, according to an embodiment of the present invention, the controller further includes:

the overvoltage and undervoltage protection module is connected with the voltage feedback end of the controller so as to protect when the output voltage is detected to be overvoltage and undervoltage;

the primary constant voltage control module is connected with the overvoltage and undervoltage protection module, and the primary constant voltage control module is also connected with the driving module through a trigger so as to perform constant voltage control on the low-voltage direct current according to the feedback voltage.

Further, according to an embodiment of the present invention, the controller further includes:

one end of the line compensation module is connected with the current feedback end of the controller so as to compensate and output a feedback current signal;

the primary constant current control module is connected with the line compensation module and is also connected with the driving module through a trigger so as to perform constant current control on the low-voltage direct current according to feedback current.

The embodiment of the utility model provides a carborundum high efficiency power is equipped with drive module and carborundum switch tube in through the controller, the drain electrode of carborundum switch tube is connected with the other end of the primary coil of transformer, the source electrode of carborundum switch tube is connected with reference ground, the PWM signal output part of drive module with the grid of carborundum switch tube is connected to carry out PWM modulation through output PWM signal to the electric current of transformer primary coil; the output rectifying and filtering circuit is connected with the secondary coil of the transformer so as to rectify and filter the PWM power supply signal output by the transformer into low-voltage direct current and output the low-voltage direct current. Therefore, by adopting the silicon carbide (SiC) as the switching tube, the switching tube has higher working temperature and better reliability, the working frequency can be doubled, and the power loss can be reduced. Therefore, the size of the power supply circuit is smaller, and the cost of the whole circuit is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a silicon carbide high-efficiency power supply circuit provided by an embodiment of the present invention;

fig. 2 is a block diagram of a circuit structure of a controller according to an embodiment of the present invention.

The purpose of the present invention is to provide a portable electronic device, which can be easily and conveniently operated.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Reference herein 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 invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1 and 2, an embodiment of the present invention provides a silicon carbide high efficiency power supply, including: the alternating current-direct current converter comprises an alternating current-direct current conversion circuit, a transformer, a controller and an output rectification filter circuit, wherein the alternating current-direct current conversion circuit is used for being connected with input alternating current so as to convert the input alternating current into high-voltage direct current; through alternating current-direct current conversion module can be with commercial power alternating current conversion to first direct current, first direct current is high voltage direct current. For example, 220V AC power is rectified into DC power.

One end of a primary coil of the transformer is connected with the high-voltage direct-current output end; the transformer can transform and output the first direct current after pulse width modulation, so that high-voltage direct current is converted into low-voltage direct current to be output, and power is supplied to low-voltage power equipment.

A driving module and a silicon carbide switching tube are arranged in the controller, a drain electrode of the silicon carbide switching tube is connected with the other end of the primary coil of the transformer, a source electrode of the silicon carbide switching tube is connected with a reference ground, and a PWM signal output end of the driving module is connected with a grid electrode of the silicon carbide switching tube so as to perform PWM modulation on the current of the primary coil of the transformer by outputting a PWM signal; the driving module can output PWM pulse modulation signals, the pulse modulation signals act on the grid electrode of the silicon carbide switching tube, and the silicon carbide switching tube can be controlled to be switched on or switched off, so that the PWM pulse modulation of the current of the primary coil of the transformer is realized.

In order to reduce the channel resistance of the silicon carbide MOSFET, a Planar (Planar) silicon carbide MOSFET structure is usually designed as a very thin gate oxide layer, coolSiC products of the silicon carbide MOSFET adopt different gate structures, the structure is called a Trench (Trench) silicon carbide MOSFET, the channel resistance of the silicon carbide MOSFET is not strongly related to the gate oxide layer, and thus the gate height is guaranteed to be reliable while the on-resistance is still extremely low. Silicon carbide (SiC) is a third-generation semiconductor, has a wide band-of-energy compound semiconductor and a SiC power device SiC MOSFET, is used as a core device of a next-generation power semiconductor, has the characteristics of ultralow switching loss, low conduction loss, ultrahigh operating junction temperature and the like, plays a decisive role in realizing high efficiency and high frequency of a system, and has the advantages of high efficiency, high frequency and high temperature resistance of the SiC power device. The embodiment of the utility model provides an in, through adopting carborundum (SiC) as the switch tube, have higher operating temperature, better reliability, make operating frequency can increase the one time, reducible power loss. Therefore, the size of the power supply circuit is smaller, and the cost of the whole circuit is reduced.

The output rectifying and filtering circuit is connected with the secondary coil of the transformer so as to output the PWM power supply signal output by the transformer after rectifying and filtering the PWM power supply signal into low-voltage direct current. The stable direct current of the primary coil of the transformer can be modulated into pulse direct current through the silicon carbide switching tube. Therefore, after the pulse direct current is transformed by the transformer, the transformer secondary coil outputs the pulse direct current, the pulse direct current needs to be converted into stable direct current because the transformer secondary coil outputs the pulse direct current, and the output power supply of the transformer secondary coil can be rectified and output through the output rectifying and filtering circuit. And after the voltage stabilization and filtering, stable direct current is output, so that a stable low-voltage direct current power supply is provided for rear-end electric equipment.

Referring to fig. 2, a cycle-by-cycle current limiting protection module is further disposed in the controller, and the cycle-by-cycle current limiting protection module is connected to a current detection end of the controller to limit a maximum inductive current flowing through the switch tube during each conduction period of the silicon carbide switch tube. Through the cycle-by-cycle current-limiting protection module, during the conduction period of the power silicon carbide switching tube each time, the PWM IC controller can limit the maximum inductive current flowing through the silicon carbide switching tube, and when the voltage on the sampling resistor exceeds the peak current reference Vcs ocp, the silicon carbide switching tube can be immediately turned off, so that the maximum peak current of the circuit is ensured. The circuit is ensured to be in a safe current state, circuit faults caused by outputting of overlarge current are avoided, and the danger of explosion is reduced.

Referring to fig. 2, a fault protection module is further disposed in the controller, and the fault protection module is connected to the driving module to output a fault signal to the driving module; because power supply circuit in the use, various abnormal conditions such as short circuit, excess temperature, overcurrent or excessive pressure can appear, through fault protection module can monitor the abnormal conditions that power supply circuit appears in the use to when abnormal conditions appeared, in time pass through drive module control carborundum switch tube is cut off. Therefore, the power supply output of the power supply circuit can be stopped, the protection of abnormal conditions is realized, and the safety of the power supply circuit is ensured.

The fault protection module comprises a short-circuit protection module, and the short-circuit protection module is connected with the output end of the cycle-by-cycle current-limiting protection module to perform overcurrent protection. The current amount of the silicon carbide switching tube during conduction can be detected in real time through the cycle-by-cycle current-limiting protection module, and the current of the silicon carbide switching tube is in proportional relation with the output current of the power circuit. The output current amount of the power circuit can be obtained by obtaining the current amount of the silicon carbide switching tube during conduction, whether the power supply is short-circuited or not can be judged by the short-circuit protection module, and when the power supply is short-circuited, the silicon carbide switching tube is controlled to be cut off by the driving module, so that power output short-circuit protection is realized.

Referring to fig. 1, the silicon carbide high efficiency power supply further includes a spike absorption circuit for absorbing a strong pulse signal generated by the primary coil of the transformer, the spike absorption circuit including: the diode D2, the capacitor C2 and the resistor R3, wherein the anode of the diode D2 is connected with the other end of the primary coil of the transformer; one end of the capacitor C2 is connected to the cathode of the diode D2, and the other end of the capacitor C2 is connected to the one end of the transformer; one end of the resistor R3 is connected with the cathode of the diode D2, and the other end of the resistor R3 is connected with the one end of the transformer.

Specifically, as shown in fig. 1, the current on the primary coil of the transformer can be PWM-pulsed by the silicon carbide switching tube, since the current on the primary coil of the transformer cannot abruptly change during the turn-off of the silicon carbide switching tube. At this time, a peak voltage may be generated at a connection end of the transformer primary coil and the silicon carbide switching tube, and the silicon carbide switching tube in a cut-off state may be broken by the peak voltage, so that the silicon carbide switching tube is damaged and cannot turn off a current on the transformer primary coil, and a power circuit cannot normally operate. Through the diode D2, when the silicon carbide switching tube turns off the current on the primary coil of the transformer, the peak signal generated by the primary coil of the transformer enables the diode D2 to be conducted, and the peak signal can be absorbed through the capacitor C2 and the resistor R3, so that the silicon carbide switching tube is prevented from being damaged by the peak signal.

Referring to fig. 1, the output rectifying and filtering circuit includes: a diode D3 and a capacitor EC2, wherein the anode of the diode D3 is connected with one end of the secondary coil of the transformer; one end of the capacitor EC2 is connected to the cathode of the diode D3, and the other end of the capacitor EC2 is connected to the other end of the secondary coil.

Specifically, as shown in fig. 1, the stabilized dc power of the primary coil of the transformer may be modulated into a pulsed dc power through a silicon carbide switching tube. In this way, the transformer can transform the pulse direct current to output the pulse direct current, and the transformer secondary coil outputs the pulse direct current, so that the pulse direct current needs to be converted into stable direct current, and the output power supply of the transformer secondary coil can be rectified and output through the unidirectional conductivity of the diode D3. And after voltage stabilization and filtering are carried out through the capacitor EC2, stable direct current is output, so that a stable low-voltage direct current power supply is provided for rear-end electric equipment.

Referring to fig. 1, the silicon carbide high-efficiency power supply further includes a voltage feedback circuit, where the voltage feedback circuit is configured to feed back the low-voltage dc output by the output rectifying filter to the controller, so as to regulate and control the PWM pulse voltage regulating signal through the controller, so as to stabilize the low-voltage dc at a set output voltage value. The voltage which can be output by the power supply circuit is fed back to the controller through the voltage feedback circuit, so that the controller can conveniently adjust the pulse width of the PWM pulse voltage regulating signal according to the output voltage value. So that the output power supply remains stable.

More specifically, as shown in fig. 1, the voltage feedback circuit includes: the circuit comprises a resistor R4, a resistor R5, a three-terminal comparator U2 and an optocoupler U3, wherein one end of the resistor R4 is connected with the output end of the output rectifying and filtering circuit; one end of the resistor R5 is connected with the other end of the resistor R4, and the other end of the resistor R5 is connected with a reference ground; the voltage comparison end of the three-end comparator U2 is connected with the one end of the resistor R5, and the anode of the three-end comparator U2 is connected with reference ground; the light emitting diode anode end of the optocoupler U3 is connected with the output end of the output rectifying and filtering circuit through a resistor R2, the light emitting diode cathode end of the optocoupler U3 is connected with the negative electrode of the three-terminal comparator U2, the triode transmitter of the optocoupler U3 is connected with a reference ground, and the triode collector end of the optocoupler U3 is connected with the voltage feedback end of the controller.

As shown in fig. 1, the voltage feedback circuit operates on the principle that a voltage dividing circuit is formed by a resistor R4 and a resistor R5, and after voltage outputted by the output rectifying and filtering circuit is divided, a voltage comparison end of the three-terminal comparator U2 is outputted to control light emission of the optocoupler U3. For example, when the output voltage suddenly increases and is higher than the set value, the voltage divided by the resistor R4 and the resistor R5 also increases, so that the voltage at the voltage comparison end of the three-terminal comparator U2 also increases. The conduction current of the three-terminal comparator U2 is increased, so that the light-emitting diode of the optocoupler U3 generates corresponding light, the light makes the phototriode of the optocoupler U3 correspondingly generate corresponding conduction current, a feedback signal is fed back to the voltage feedback end of the controller, the controller correspondingly adjusts the PWM pulse voltage regulation signal according to the feedback signal, the output voltage is correspondingly reduced, and the stability of the output voltage is ensured. By adopting an isolation feedback mode, the interference of the primary voltage of the transformer on the secondary output voltage can be reduced, and the stability of the output voltage is ensured.

Referring to fig. 1 and 2, the silicon carbide high-efficiency power supply further includes a chip power supply circuit, the chip power supply circuit is configured to supply power to the controller, and the chip power supply circuit includes: the device comprises a resistor R1, a capacitor C3 and a diode D1, wherein one end of the resistor R1 is connected with a power supply end of the alternating current-direct current conversion circuit; one end of the capacitor C3 is connected with the other end of the resistor R1, and the other end of the capacitor C3 is connected with a reference; the anode of the diode D1 is connected with one end of an auxiliary coil of the transformer, the other end of the auxiliary coil is connected with a reference ground, and the cathode of the diode D1 is connected with the power supply end of the controller.

Specifically, as shown in fig. 1, the high-voltage dc output by the ac-dc conversion circuit can be introduced to the power supply end of the controller through the resistor R1. Referring to fig. 2, a starting module and an internal working voltage generating module are disposed in the controller, and the high-voltage direct current introduced through the starting module is converted into low-voltage direct current and is output to the internal working voltage generating module. The internal working voltage generation module converts the internal working voltage into a power supply voltage of the internal circuit of the controller, for example, the internal working voltage is converted into 3.3V or 1.2V, and the like, so as to provide a power supply source for the inside of the controller. After the controller is started, the power supply circuit starts to work normally, and the primary coil, the secondary coil and the auxiliary coil of the transformer respectively generate working currents. The controller can continue to be powered by the amount of current on the auxiliary coil. Specifically, the pulse direct current on the auxiliary coil is rectified and output through the diode D1, and is output to the power supply end of the controller after being subjected to voltage stabilization and filtering through the capacitor C3, so as to continuously provide power supply voltage for the controller. Thus, the external power supply can be reduced, thereby reducing the production cost of the power circuit.

Referring to fig. 2, the controller further includes: the overvoltage and undervoltage protection module is connected with a voltage feedback end of the controller so as to protect when the output voltage is detected to be overvoltage or undervoltage; as shown in fig. 2, the overvoltage and undervoltage protection module can detect the voltage of the voltage feedback end in real time, and protect the power circuit when detecting that the voltage is in an overvoltage state or an undervoltage state, so as to prevent the power circuit from being damaged.

The primary constant voltage control module is connected with the overvoltage and undervoltage protection module, and the primary constant voltage control module is also connected with the driving module through a trigger so as to perform constant voltage control on the low-voltage direct current according to the feedback voltage. The feedback voltage quantity is compared with a reference value and output through the overvoltage and undervoltage protection module, so that the feedback voltage quantity error is output to the primary constant voltage control module, after voltage calibration of constant voltage output is carried out through the primary constant voltage control module, the output precision is adjusted, and the pulse width of the constant voltage PWM is adjusted. The output voltage of the power supply circuit is output in a high-precision constant voltage mode.

Referring to fig. 2, the controller further includes: the circuit comprises a circuit compensation module and a primary constant current control module, wherein one end of the circuit compensation module is connected with a current feedback end of the controller so as to compensate and output a feedback current signal; the primary constant current control module is connected with the line compensation module, and is also connected with the driving module through a trigger so as to perform constant current control on the low-voltage direct current according to the feedback current.

The line compensation module is respectively connected with the primary side current feedback end of the switching power supply and the primary constant voltage control module so as to perform slope compensation processing of output current according to the primary side current feedback value, so that the power supply circuit can output a voltage value with a set slope to meet the current slope requirements of battery charging and motor driving. In the application of battery charging and motor driving, the slope control and constant current output control are carried out on the output current through the line compensation module and the primary constant current control module, so that the current slope requirements of battery charging and motor driving are met, and the charging safety is ensured.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the specification and the attached drawing content of the utility model were done, direct or indirect application is in other relevant technical field, all the same reason is within the utility model discloses the patent protection within scope.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (10)

1. A silicon carbide high efficiency power supply, comprising:

the alternating current-direct current conversion circuit is used for being connected with input alternating current so as to convert the input alternating current into high-voltage direct current;

one end of a primary coil of the transformer is connected with the high-voltage direct-current output end;

the controller is internally provided with a driving module and a silicon carbide switching tube, the drain electrode of the silicon carbide switching tube is connected with the other end of the primary coil of the transformer, the source electrode of the silicon carbide switching tube is connected with a reference ground, and the PWM signal output end of the driving module is connected with the grid electrode of the silicon carbide switching tube so as to perform PWM modulation on the current of the primary coil of the transformer by outputting a PWM signal;

and the output rectifying and filtering circuit is connected with the secondary coil of the transformer so as to carry out rectifying and filtering on the PWM power supply signal output by the transformer to low-voltage direct current and then output the low-voltage direct current.

2. The silicon carbide high efficiency power supply of claim 1 further comprising a cycle-by-cycle current limiting protection module disposed within the controller, the cycle-by-cycle current limiting protection module being connected to the current sensing terminal of the controller to limit the maximum inductor current flowing through the switching tube during each conduction cycle of the silicon carbide switching tube.

3. The silicon carbide high efficiency power supply of claim 2 further comprising a fault protection module disposed within the controller, the fault protection module being connected to the drive module to output a fault signal to the drive module;

the fault protection module comprises a short-circuit protection module, and the short-circuit protection module is connected with the output end of the cycle-by-cycle current-limiting protection module to perform short-circuit protection.

4. The silicon carbide high efficiency power supply of claim 1 further comprising a spike absorption circuit for absorbing strong pulse signals generated by the transformer primary coil, the spike absorption circuit comprising:

a diode D2, an anode of the diode D2 being connected to the other end of the primary coil of the transformer;

one end of the capacitor C2 is connected with the cathode of the diode D2, and the other end of the capacitor C2 is connected with the one end of the transformer;

and one end of the resistor R3 is connected with the cathode of the diode D2, and the other end of the resistor R3 is connected with the one end of the transformer.

5. The silicon carbide high efficiency power supply of claim 1 wherein the output rectifying filter circuit comprises:

a diode D3, an anode of the diode D3 being connected to one end of the secondary coil of the transformer;

and one end of the capacitor EC2 is connected with the cathode of the diode D3, and the other end of the capacitor EC2 is connected with the other end of the secondary coil.

6. The silicon carbide high efficiency power supply of claim 1 further comprising a voltage feedback circuit for feeding back a low voltage dc output from the output rectifying filter to the controller for regulating and controlling a PWM pulse voltage regulating signal by the controller to stabilize the low voltage dc at a set output voltage value.

7. The silicon carbide high efficiency power supply of claim 6 wherein the voltage feedback circuit comprises:

one end of the resistor R4 is connected with the output end of the output rectifying and filtering circuit;

one end of the resistor R5 is connected with the other end of the resistor R4, and the other end of the resistor R5 is connected with a reference ground;

a voltage comparison end of the three-terminal comparator U2 is connected with the one end of the resistor R5, and an anode of the three-terminal comparator U2 is connected with a reference ground;

the optocoupler U3, the emitting diode anode end of optocoupler U3 pass through resistance R2 with the output rectification filter circuit output is connected, the emitting diode cathode end of optocoupler U3 with three-terminal comparator U2's negative pole is connected, optocoupler U3's triode transmitter is connected with referring to ground, optocoupler U3's triode collector terminal with the voltage feedback end of controller is connected.

8. The silicon carbide high efficiency power supply of claim 1 further comprising a chip power supply circuit for powering the controller, the chip power supply circuit comprising:

one end of the resistor R1 is connected with a power supply end of the alternating current-direct current conversion circuit;

one end of the capacitor C3 is connected with the other end of the resistor R1, and the other end of the capacitor C3 is connected with a reference;

and the anode of the diode D1 is connected with one end of an auxiliary coil of the transformer, the other end of the auxiliary coil is connected with a reference ground, and the cathode of the diode D1 is connected with the power supply end of the controller.

9. The silicon carbide high efficiency power supply of any one of claims 1 to 8 wherein the controller further comprises:

the overvoltage and undervoltage protection module is connected with the voltage feedback end of the controller so as to protect when the output voltage is detected to be overvoltage and undervoltage;

the primary constant voltage control module is connected with the overvoltage and undervoltage protection module, and the primary constant voltage control module is also connected with the driving module through a trigger so as to perform constant voltage control on the low-voltage direct current according to the feedback voltage.

10. The silicon carbide high efficiency power supply of claim 7 wherein the controller further comprises:

one end of the line compensation module is connected with the current feedback end of the controller so as to compensate and output a feedback current signal;

the primary constant current control module is connected with the line compensation module and is also connected with the driving module through a trigger so as to perform constant current control on the low-voltage direct current according to feedback current.

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