CN220732408U - Intelligent low-carbon silicon carbide digital power charger - Google Patents

Abstract

The utility model discloses a silicon carbide intelligent low-carbon digital power supply charger, which comprises: the DC-AC conversion circuit, the power factor correction circuit, the transformer, the output rectification circuit, the switching tube circuit and the controller circuit are connected with the grid electrode of the silicon carbide switching tube through the switching tube circuit, the control signal output end of the controller is connected with the grid electrode of the silicon carbide switching tube so as to output pulse width modulation signals to carry out switching control on the silicon carbide switching tube, the current of the primary coil of the transformer is subjected to pulse width modulation through the silicon carbide switching tube, and the output rectification circuit is used for carrying out voltage stabilizing filtering on the voltage transformation signals output by the secondary coil of the transformer so as to output a DC power supply. The silicon carbide device is used as a switching tube of a primary coil of the transformer, so that the charging function with high efficiency, high frequency and high temperature stability can be realized.

Description

Intelligent low-carbon silicon carbide digital power charger

Technical Field

The utility model relates to the technical field of power supplies, in particular to a silicon carbide intelligent low-carbon digital power supply charger.

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 controlling the on or off of the current on the transformer or the inductor. In the prior art, an MOS tube is mainly used for realizing the on or off control of current. The existing MOS tube (MOSFET, metal Oxide Semiconductor Field Effect Transistor), namely the metal oxide semiconductor type field effect tube, belongs to the insulated gate type field effect tube. The process is that two N+ regions with high doping concentration are manufactured on a P-type semiconductor silicon substrate with low doping concentration by using semiconductor photoetching and diffusion processes, and two electrodes are led out by using metal aluminum and respectively used as a drain electrode D and a source electrode 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 serve as a grid electrode G. This constitutes an N-channel (NPN type) enhancement MOS transistor. However, the existing MOS transistor has a low operating frequency, which results in a problem that the whole power supply circuit is bulky and the whole circuit is costly.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present utility model is to provide a silicon carbide smart low-carbon digital power charger.

To achieve the above object, according to an embodiment of the present utility model, a silicon carbide smart low-carbon digital power charger includes:

the alternating current-direct current conversion circuit is connected with an input power supply to convert the input power supply into a high-voltage direct current power supply;

the power factor correction circuit is connected with the output end of the high-voltage direct-current power supply of the alternating-current and direct-current conversion circuit so as to perform power factor correction output on the high-voltage direct-current power supply;

one end of a primary coil of the transformer is connected with the output end of the power factor correction circuit;

the input end of the output rectifying circuit is connected with the secondary coil of the transformer;

the switching tube circuit comprises 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, and the source electrode of the silicon carbide switching tube is connected with the reference ground;

the controller circuit comprises a controller, wherein a control signal output end of the controller is connected with a grid electrode of the silicon carbide switching tube so as to output a pulse width modulation signal to carry out switching control on the silicon carbide switching tube, the current of a primary coil of the transformer is subjected to pulse width modulation through the silicon carbide switching tube, and the output rectifying circuit is used for carrying out voltage stabilizing filtering on a voltage transformation signal output by a secondary coil of the transformer so as to output a direct current power supply.

Further, according to an embodiment of the present utility model, the silicon carbide smart low-carbon digital power charger further includes an optocoupler feedback circuit, where the optocoupler feedback circuit is connected to the output end of the output rectifying circuit and the switching tube circuit, respectively, so as to feed back an output current and/or voltage signal to the controller.

Further, according to an embodiment of the present utility model, the smart low-carbon silicon carbide digital power charger further includes an auxiliary power circuit, and the auxiliary power circuit is connected to the controller to supply power to the controller after stabilizing the output power of the auxiliary winding of the transformer.

Further, according to an embodiment of the present utility model, the smart low-carbon silicon carbide digital power charger further includes a high-voltage start power supply circuit, and the high-voltage start power supply circuit is connected to the ac/dc conversion circuit and the controller, respectively, so as to output dc power from the ac/dc conversion circuit to perform high-voltage start power supply for the controller.

Further, according to an embodiment of the present utility model, the power factor correction circuit includes:

one end of the inductor T2 is connected with the half-wave direct current output end of the alternating current-direct current conversion circuit;

the drain electrode of the switching tube Q1 is connected with the other end of the inductor T2;

a diode D1, wherein an anode of the diode D1 is connected with the other end of the inductor T2;

one end of the first capacitor EC1 is connected with the cathode of the diode D1, and the other end of the first capacitor EC1 is connected with the reference ground;

the power factor driving end of the controller is connected with the grid electrode of the switching tube Q1 through the switching tube driving circuit so as to drive and control the switching tube Q1;

the source electrode of the switching tube Q1 is connected with the reference ground through the first current detection circuit, and the first current detection circuit is also connected with the power factor current detection end of the controller;

the first voltage detection circuit is connected with one end of the first capacitor EC1, so that the voltage output by the first capacitor EC1 in a stabilized manner is divided and then output to the power factor voltage detection end of the controller.

Further, according to an embodiment of the present utility model, the output rectifying circuit includes:

the source electrode of the MOS switch tube Q3 is connected with one end of a secondary coil of the transformer, and the other end of the secondary coil of the transformer is connected with the reference ground;

one end of the second capacitor EC3 is connected with the drain electrode of the MOS switch tube Q3, the other end of the second capacitor EC3 is connected with the reference ground, and the second capacitor EC3 is used for stabilizing voltage and outputting the rectified power supply of the MOS switch tube Q3;

and the rectifying driving end of the rectifying controller is connected with the grid electrode of the MOS switch tube Q3, and the detecting end of the rectifying controller is connected with one end of the secondary coil of the transformer through a first resistor R21 so as to rectify and output the secondary coil output power supply of the transformer.

Further, according to an embodiment of the present utility model, the optocoupler feedback circuit includes:

the light-emitting diode comprises an optical coupler U2A, wherein the anode of the light-emitting diode end of the optical coupler U2A is connected with the anode of a voltage stabilizer ZD1, and the cathode of the voltage stabilizer ZD1 is connected with the direct current output end of the output rectifying circuit;

the output end of the first comparator is connected with the cathode of the first diode D8, the anode of the first diode D8 is connected with the cathode of the light emitting diode end of the optocoupler U2A, the normal phase input end of the first comparator is connected with the direct current output end of the output rectifying circuit through the second resistor R47, the normal phase input end of the first comparator is also connected with one end of the third resistor R48, the other end of the third resistor R48 is connected with one end of the fourth resistor R49, the other end of the fourth resistor R49 is connected with the reference ground, the reverse phase input end of the first comparator is connected with one end of the fifth resistor R45, the other end of the fifth resistor R45 is connected with the reference ground, and the reverse phase input end of the first comparator is also connected with the direct current output end of the output rectifying circuit through a resistor so as to carry out voltage feedback through the optocoupler.

Further, according to an embodiment of the present utility model, the optocoupler feedback circuit further includes:

the output end of the second comparator is connected with the cathode of a second diode D9, the anode of the second diode D9 is connected with the cathode of the light-emitting diode end of the optocoupler U2A, the positive input end of the second comparator is connected with the direct current output end of the output rectifying circuit through a second resistor R47, and the positive input end of the second comparator is connected with one end of a fourth resistor R49;

and the current detection resistor R56 is connected in series with the power supply output loop of the output rectifying circuit, and the inverting input end of the second comparator is connected with the current detection resistor R56 through a resistor so as to perform current feedback through the optocoupler.

Further, according to an embodiment of the present utility model, the optocoupler feedback circuit further includes an output voltage regulation circuit, the output voltage regulation circuit including:

a sixth resistor R53, wherein one end of the sixth resistor R53 is connected to the one end of the fourth resistor R49;

and a drain electrode of the MOS transistor Q4 is connected with the other end of the sixth resistor R53, a source electrode of the MOS transistor Q4 is connected with the reference ground, and a grid electrode of the MOS transistor Q4 is connected with a voltage regulation signal end through a seventh resistor R58.

Further, according to an embodiment of the present utility model, the silicon carbide smart low-carbon digital power charger further includes a power output interface circuit, the power output interface circuit including:

the direct-current power supply interface is used for being connected with electric equipment, and the voltage regulation signal end is arranged on the direct-current power supply interface;

and the direct-current power supply interface is connected with the direct-current power supply output end of the output rectifying circuit through the common-mode coil.

The intelligent low-carbon silicon carbide digital power supply charger provided by the embodiment of the utility model comprises a silicon carbide switching tube through a switching tube circuit, wherein the drain electrode of the silicon carbide switching tube is connected with the other end of a primary coil of a transformer, and the source electrode of the silicon carbide switching tube is connected with a reference ground; the controller circuit comprises a controller, a control signal output end of the controller is connected with a grid electrode of the silicon carbide switching tube so as to output a pulse width modulation signal to carry out switching control on the silicon carbide switching tube, the current of a primary coil of the transformer is subjected to pulse width modulation through the silicon carbide switching tube, and the output rectifying circuit is used for carrying out voltage stabilizing filtering on a voltage transformation signal output by a secondary coil of the transformer so as to output a direct current power supply. The silicon carbide device is used as a switching tube of a primary coil of the transformer, so that the charging function with high efficiency, high frequency and high temperature stability can be realized.

Drawings

FIG. 1 is a block diagram of a silicon carbide intelligent low-carbon digital power charger according to the present utility model;

fig. 2 is a schematic diagram of a circuit structure of a silicon carbide intelligent low-carbon digital power supply charger provided by the utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

In order to enable those skilled in the art to better understand the present utility model, the following description will make clear and complete descriptions of the technical solutions according to the embodiments of the present utility model with reference to the accompanying drawings. 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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 and 2, an embodiment of the present utility model provides a silicon carbide smart low-carbon digital power charger, including: the power factor correction circuit comprises an alternating current-direct current conversion circuit, a power factor correction circuit, a transformer, an output rectification circuit, a switching tube circuit and a controller circuit, wherein the alternating current-direct current conversion circuit is connected with an input power supply to convert the input power supply into a high-voltage direct current power supply; wherein, the alternating current-direct current conversion circuit includes: fuse 1, varistor MOV, thermistor NTC1, common-mode coil LF1, safety capacitors CY 1-CY 4, common-mode coil LF2, rectifier BD1, capacitor CCB1, inductor L1 and capacitor CCB2. As shown in fig. 2, the fuse 1, the varistor MOV, the thermistor NTC1, the common-mode coil LF1, the safety capacitors CY1 to CY4, and the common-mode coil LF2 may be connected in series or in parallel in order to perform safety protection on the input ac, and convert the introduced ac into half-wave dc through the rectifier BD1 and output the half-wave dc, where the capacitor CCB1, the inductor L1, and the capacitor CCB2 form a filter circuit, and may filter the interference signal and output the half-wave dc to the power factor correction circuit.

The power factor correction circuit is connected with the output end of the high-voltage direct-current power supply of the alternating-current and direct-current conversion circuit so as to perform power factor correction output on the high-voltage direct-current power supply; the chopper circuit is a power factor correction PFC circuit, and has the function of synchronizing a current waveform with a voltage waveform and synchronizing a rectified voltage with a current phase, so that the phase angle of the current waveform tracks the phase angle of the voltage waveform, and power factor correction is realized. The output voltage of the PFC circuit is higher than the peak voltage during AC input, so that the rectified voltage waveform has no negative value, the current waveform is ensured not to have negative value, the current waveform is in phase with the voltage waveform, the harmonic component is reduced, and the power factor is improved. After the output of the chopper circuit of DC-DC is filtered by the filter capacitor, stable high-power direct current can be output to the primary coil of the transformer.

One end of a primary coil of the transformer is connected with the output end of the power factor correction circuit; the input end of the output rectifying circuit is connected with the secondary coil of the transformer; the switching tube circuit comprises a silicon carbide switching tube, wherein the drain electrode of the silicon carbide switching tube is connected with the other end of the primary coil of the transformer, and the source electrode of the silicon carbide switching tube is connected with the reference ground; the controller circuit comprises a controller, a control signal output end of the controller is connected with a grid electrode of the silicon carbide switching tube so as to output a pulse width modulation signal to carry out switching control on the silicon carbide switching tube, the current of a primary coil of the transformer is subjected to pulse width modulation through the silicon carbide switching tube, and the output rectifying circuit is used for carrying out voltage stabilizing filtering on a transformation signal output by a secondary coil of the transformer so as to output a direct current power supply.

Specifically, during the voltage transformation process by the voltage transformer, the controller can adjust the pulse signal to the silicon carbide switching tube by outputting the pulse width. Therefore, the on or off of the silicon carbide switching tube can be controlled, the on or off of the silicon carbide switching tube can carry out pulse modulation on the high-voltage direct current on the primary coil of the transformer, the high-voltage direct current after pulse modulation can be output from the secondary coil of the transformer through mutual inductance and transformation, and the output rectifying circuit is used for carrying out voltage stabilization filtering on a transformation signal output by the secondary coil of the transformer so as to output a direct current power supply. In the embodiment, the SiC MOSFET device is used as a switching tube of the primary coil of the transformer, so that the charging function with high efficiency, high frequency and high temperature stability can be realized. Compared with the traditional charger, the SiC charger has the following advantages: high efficiency: the SiC power device has lower conduction loss and switching loss, can improve the efficiency of a circuit and reduce the heating value. High frequency properties: the SiC power device can work at high temperature and has rapid switching speed, so that the SiC power device can work at higher frequency and is suitable for high-frequency switching power supplies, power electronic converters and the like. High temperature stability: the SiC power device has higher thermal stability, and can keep stable performance and reliability in a high-temperature environment. Low reverse recovery loss: the SiC power device has lower reverse recovery loss, and can reduce the volume and the cost of the diode. High efficiency and energy saving: the SiC power device can be used for manufacturing an efficient power converter, so that customers can be helped to reduce energy consumption and carbon emission, and the effects of energy conservation and emission reduction are achieved.

Referring to fig. 1 and 2, the silicon carbide smart low-carbon digital power supply charger further includes an optocoupler feedback circuit, where the optocoupler feedback circuit is connected to the output end of the output rectifying circuit and the switching tube circuit, respectively, so as to feed back an output current and/or voltage signal to the controller. As shown in fig. 1, the optocoupler feedback circuit detects the voltage and/or current of the output power supply, and feeds back the detected voltage and/or current value to the switching tube circuit, and feeds back the voltage and/or current value to the controller through the switching tube circuit, so that the controller can perform pulse width modulation according to the voltage and/or current value to ensure the stability of the output voltage and/or current and perform overcurrent and overvoltage protection. As shown in fig. 2, the output rectifying circuit includes: the MOS switch tube Q3, the second capacitor EC3 and the rectification controller U3, wherein the source electrode of the MOS switch tube Q3 is connected with one end of the secondary coil of the transformer, and the other end of the secondary coil of the transformer is connected with the reference ground; one end of the second capacitor EC3 is connected with the drain electrode of the MOS switch tube Q3, the other end of the second capacitor EC3 is connected with the reference ground, and the second capacitor EC3 is used for stabilizing voltage and outputting the rectifying power supply of the MOS switch tube Q3; the rectification driving end of the rectification controller U3 is connected with the grid electrode of the MOS switch tube Q3, and the detection end of the rectification controller U3 is connected with one end of the secondary coil of the transformer through a first resistor R21 so as to rectify and output the output power of the secondary coil of the transformer.

Specifically, the state of the primary winding of the transformer can be detected by the rectifier U3. And the MOS switch tube Q3 is conducted or cut-off controlled according to the state of the primary coil of the transformer, so that the output current of the secondary coil of the transformer is rectified and output. After the output current of the MOS switch tube Q3 is stabilized through the second capacitor EC3, stable direct current can be output to supply power for the back-end power supply. The MOS switch tube Q3 rectifies the output power of the secondary coil of the transformer, so that the power consumption of the rectifying circuit can be reduced, and the conversion efficiency of the power supply can be improved. In addition, the voltage stabilizing filter capacitor may include a plurality of capacitors (e.g., the second capacitors EC3, EC4 and EC 5). The voltage stabilizing filter capacitors are connected in parallel, so that ripple waves of the output power supply can be reduced, and the stability of the output power supply is ensured.

Referring to fig. 1 and 2, the silicon carbide smart low-carbon digital power charger further comprises an auxiliary power circuit, wherein the auxiliary power circuit is connected with the controller to supply power to the controller after stabilizing the voltage of the auxiliary coil output power of the transformer. As shown in fig. 2, the auxiliary power circuit includes a capacitor C26, a resistor R34, a diode D7, a capacitor EC2, and a capacitor C16, one end of the capacitor C23 is connected to one end of the auxiliary winding T1B of the transformer, and the other end of the auxiliary winding T1B of the transformer is connected to the reference ground. The other end of the capacitor C16 is connected with the reference ground, one end of the resistor R34 is connected with one end of the auxiliary coil T1B, the other end of the resistor R34 is connected with the anode of the diode D7, the cathode of the diode D7 is connected with the power control end of the controller, one ends of the capacitor EC2 and the capacitor C16 are respectively connected with the cathode of the diode D7, and the other ends of the capacitor EC2 and the capacitor C16 are respectively connected with the reference ground. The output power supply of the auxiliary coil T1B of the transformer can be filtered through the capacitor C26, rectified through the diode D7 and then output to the capacitor EC2 and the capacitor C16, and after voltage stabilization through the capacitor EC2 and the capacitor C16, voltage stabilization direct current is output to the power supply control end of the controller, so that the controller is powered. Resistor R34 is a limiting current resistor, and the controller is prevented from being burnt out by high current.

Referring to fig. 1 and 2, the silicon carbide intelligent low-carbon digital power supply charger further comprises a high-voltage starting power supply circuit, wherein the high-voltage starting power supply circuit is respectively connected with the ac-dc conversion circuit and the controller, so that the ac-dc conversion circuit outputs direct current to supply power for the controller to perform high-voltage starting. As shown in fig. 2, the high-voltage starting power supply circuit includes a diode D3, a diode D4, a resistor R22 and a resistor R23, where the diode D3 and the diode D4 form a rectifying circuit, rectify and output an input alternating current to the resistors R22 and R23, and after passing through the resistor R22 and the resistor R23, provide a power supply for a high-voltage starting end of the controller. Wherein, the resistor R34 is a limiting current resistor, so that the controller is prevented from being burnt out by high current.

Referring to fig. 2, the power factor correction circuit includes: the switching tube driving circuit comprises an inductor T2, a switching tube Q1, a diode D1, a first capacitor EC1, a switching tube driving circuit, a first current detection circuit and a first voltage detection circuit, wherein one end of the inductor T2 is connected with a half-wave direct current output end of the alternating current-direct current conversion circuit; the drain electrode of the switching tube Q1 is connected with the other end of the inductor T2; the anode of the diode D1 is connected with the other end of the inductor T2; one end of the first capacitor EC1 is connected with the cathode of the diode D1, and the other end of the first capacitor EC1 is connected with the reference ground; the power factor driving end of the controller is connected with the grid electrode of the switching tube Q1 through the switching tube driving circuit so as to drive and control the switching tube Q1; the source electrode of the switching tube Q1 is connected with the reference ground through the first current detection circuit, and the first current detection circuit is also connected with the power factor current detection end of the controller; the first voltage detection circuit is connected with one end of the first capacitor EC1, so that the voltage output by the first capacitor EC1 in a voltage stabilizing way is divided and then output to the power factor voltage detection end of the controller. Therefore, a DC-DC chopper circuit is added between the rectification output of the AC-DC conversion circuit and the filter capacitor, and the rectification circuit output is not directly connected with the filter capacitor for the power supply circuit, so that the power supply circuit presents a pure resistive load, and the voltage and the current waveforms are in phase and the phase are the same.

Specifically, during operation, as shown in fig. 2, the switching tube Q1 may be turned on or off under the control of the controller. The controller controls the switching tube Q1 to be periodically turned on or off by outputting PWM pulse signals, changes half-wave pulsating direct current output by the AC-DC conversion circuit into high-frequency (about 100 KHz) pulse direct current, and converts the high-frequency pulse direct current into stable high-voltage direct current after voltage stabilization again and outputs the stable high-voltage direct current to the primary coil of the transformer. In this process, the inductor T2 is a boost inductor, and the first capacitor EC1 is charged through the diode D1, so that the output voltage of EC1 is higher than the voltage of the ac-dc conversion circuit. The inductor T2 comprises a primary coil and a secondary coil, the primary coil of the inductor T2 and the inductor T2 are arranged between the AC/DC conversion circuit and the switch tube Q1, and are used for energy storage and boosting, the secondary coil of the inductor T2 feeds back the output voltage of the AC/DC conversion circuit to a zero crossing point detection end of the controller so as to detect an input AC electric zero point, and the switch tube Q1 and/or the silicon carbide switch tube can be subjected to switch control according to zero crossing point information. The first current detection circuit comprises a resistor R17, detects the working current of the switching tube Q1 through the resistor R17, and outputs the working current to a first current detection end of the controller through a resistor R18; the first voltage detection circuit comprises a resistor R3, a resistor R8, a resistor R15 and a resistor R20, wherein the resistor R3, the resistor R8, the resistor R15 and the resistor R20 form a voltage division circuit, voltage is fed back to a first voltage detection end of the controller, and pulse width or control can be performed on the switching tube Q1 through first current detection and first voltage detection so as to perform overcurrent protection or output voltage regulation and the like.

Referring to fig. 2, the optocoupler feedback circuit includes: the light-emitting diode comprises an optical coupler U2A and a first comparator, wherein the anode of the light-emitting diode end of the optical coupler U2A is connected with the anode of a voltage stabilizer ZD1, and the cathode of the voltage stabilizer ZD1 is connected with the direct current output end of the output rectifying circuit; the output end of the first comparator is connected with the cathode of the first diode D8, the anode of the first diode D8 is connected with the cathode of the light emitting diode end of the optocoupler U2A, the positive input end of the first comparator is connected with the direct current output end of the output rectifying circuit through the second resistor R47, the positive input end of the first comparator is also connected with one end of the third resistor R48, the other end of the third resistor R48 is connected with one end of the fourth resistor R49, the other end of the fourth resistor R49 is connected with the reference ground, the negative input end of the first comparator is connected with one end of the fifth resistor R45, the other end of the fifth resistor R45 is connected with the reference ground, and the negative input end of the first comparator is also connected with the direct current output end of the output rectifying circuit through a resistor so as to perform voltage feedback through the optocoupler.

In particular, as shown in fig. 2, the first comparator is integrated within the integrated chip U4. The two ends of the first comparator are respectively input with comparison voltages; the non-inverting input terminal of the first comparator inputs a first reference voltage, which is obtained by dividing the voltage by the second resistors R47, R48 and R49, and inputs the first reference voltage to the non-inverting input terminal of the first comparator. The resistors R43, R44 and R15 divide the output voltage of the output rectifying circuit and then output the divided voltage to the inverting input end of the first comparator, the divided voltage is compared with the first reference voltage, when the voltage of the inverting input end of the first comparator is higher than the voltage of the input end of Yu Zhengxiang, the triode D8 starts to be conducted, the optocoupler starts to emit light, the light is fed back to the voltage feedback end of the controller through the optocoupler, and the width of an output pulse signal is adjusted through the controller, so that stability control or overvoltage protection of the output voltage is realized.

Referring to fig. 2, the optocoupler feedback circuit further includes: the output end of the second comparator is connected with the cathode of a second diode D9, the anode of the second diode D9 is connected with the cathode of the light emitting diode end of the optocoupler U2A, the non-inverting input end of the second comparator is connected with the direct current output end of the output rectifying circuit through a second resistor R47, and the non-inverting input end of the second comparator is connected with one end of a fourth resistor R49; and the current detection resistor R56 is connected in series with the power supply output loop of the output rectifying circuit, and the inverting input end of the second comparator is connected with the current detection resistor R56 through a resistor so as to perform current feedback through the optocoupler.

In particular, as shown in fig. 2, the second comparator is integrated within the integrated chip U4. The two ends of the second comparator are respectively input with comparison voltages; the non-inverting input terminal of the second comparator inputs a second reference voltage, which is obtained by dividing the voltage by the second resistors R47, R48 and R49, and inputs the second reference voltage to the non-inverting input terminal of the second comparator. The current detection resistor R56 detects the current of the output power supply, the current detection voltage is output to the inverting input end of the second comparator through the resistors R12 and R51 and is compared with the second reference voltage, when the voltage of the inverting input end of the second comparator is higher than the voltage of the input end of Yu Zhengxiang, the triode D9 starts to be conducted, the optocoupler starts to emit light, the optocoupler feeds back the light to the voltage feedback end of the controller, and the controller adjusts the width of the output pulse signal to realize the overcurrent protection of the output current.

Referring to fig. 2, the optocoupler feedback circuit further includes an output voltage regulation circuit, the output voltage regulation circuit includes: a sixth resistor R53 and a MOS transistor Q4, one end of the sixth resistor R53 being connected to the one end of the fourth resistor R49; the drain electrode of the MOS transistor Q4 is connected with the other end of the sixth resistor R53, the source electrode of the MOS transistor Q4 is connected with the reference ground, and the grid electrode of the MOS transistor Q4 is connected with the voltage regulation signal end through a seventh resistor R58.

Specifically, as shown in fig. 2, a voltage regulation signal may also be introduced through the power output interface CN1 to regulate and control the output voltage or current amount. When the incoming signal S is a high level signal, the MOS transistor Q4 is turned on to connect the sixth resistor R53 and the fourth resistor R49 in parallel, and the total of the sixth resistor R53 and the fourth resistor R49 after the parallel connection

Specifically, as shown in fig. 2, a voltage regulation signal may also be introduced through the power output interface CN1 to regulate and control the output voltage or current amount. When the incoming signal S is a high-level signal, the MOS transistor Q4 is turned on, so that the sixth resistor R53 and the fourth resistor R49 can be connected in parallel, and at this time, the total resistance of the sixth resistor R53 and the fourth resistor R49 after being connected in parallel is smaller, so that the output voltage is also reduced, and the application occasions of different voltage requirements can be satisfied.

Referring to fig. 1 and 2, the silicon carbide smart low-carbon digital power charger further includes a power output interface circuit, the power output interface circuit includes: the direct-current power supply interface is used for being connected with electric equipment, and the voltage regulation signal end is arranged on the direct-current power supply interface; the direct-current power supply interface is connected with the direct-current power supply output end of the output rectifying circuit through the common-mode coil. As shown in fig. 2, the dc power interface CN1 is connected to the dc end of the output rectifying power output, and may be connected to an electric device through the dc power interface CN1, so as to supply power to the electric device. And the voltage regulation signal terminal can be introduced through the direct current power interface CN1, so that the output voltage is regulated and controlled. In addition, the common mode coil can be used for filtering common mode interference signals, and meanwhile, the reference ground of the direct-current power supply interface CN1 is isolated from the circuit ground of the output rectifying circuit, so that the safety of a power supply circuit is ensured.

Although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the present utility model may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model, which is within the scope of the utility model.

Claims (10)

1. A silicon carbide wisdom low-carbon digital power supply charger, characterized by, include:

the alternating current-direct current conversion circuit is connected with an input power supply to convert the input power supply into a high-voltage direct current power supply;

the power factor correction circuit is connected with the output end of the high-voltage direct-current power supply of the alternating-current and direct-current conversion circuit so as to perform power factor correction output on the high-voltage direct-current power supply;

one end of a primary coil of the transformer is connected with the output end of the power factor correction circuit;

the input end of the output rectifying circuit is connected with the secondary coil of the transformer;

the switching tube circuit comprises 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, and the source electrode of the silicon carbide switching tube is connected with the reference ground;

the controller circuit comprises a controller, wherein a control signal output end of the controller is connected with a grid electrode of the silicon carbide switching tube so as to output a pulse width modulation signal to carry out switching control on the silicon carbide switching tube, the current of a primary coil of the transformer is subjected to pulse width modulation through the silicon carbide switching tube, and the output rectifying circuit is used for carrying out voltage stabilizing filtering on a voltage transformation signal output by a secondary coil of the transformer so as to output a direct current power supply.

2. The intelligent low-carbon digital power supply charger of claim 1, further comprising an optocoupler feedback circuit, wherein the optocoupler feedback circuit is connected to the output end of the output rectifying circuit and the switching tube circuit, respectively, to feed back output current and/or voltage signals to the controller.

3. The intelligent low-carbon digital power supply charger of claim 1 or 2, further comprising an auxiliary power supply circuit connected to the controller for supplying power to the controller after stabilizing the auxiliary coil output power of the transformer.

4. The intelligent low-carbon digital power supply charger of claim 3, further comprising a high-voltage start power supply circuit, wherein the high-voltage start power supply circuit is respectively connected with the ac-dc conversion circuit and the controller, so as to output dc power from the ac-dc conversion circuit to perform high-voltage start power supply for the controller.

5. The silicon carbide smart low-carbon digital power charger of claim 1, wherein the power factor correction circuit comprises:

one end of the inductor (T2) is connected with the half-wave direct current output end of the alternating current-direct current conversion circuit;

the drain electrode of the switching tube (Q1) is connected with the other end of the inductor (T2);

-a diode (D1), the anode of said diode (D1) being connected to said other end of said inductance (T2);

a first capacitor (EC 1), one end of the first capacitor (EC 1) is connected to the cathode of the diode (D1), and the other end of the first capacitor (EC 1) is connected to the reference ground;

the power factor driving end of the controller is connected with the grid electrode of the switching tube (Q1) through the switching tube driving circuit so as to drive and control the switching tube (Q1);

the source electrode of the switching tube (Q1) is connected with the reference ground through the first current detection circuit, and the first current detection circuit is also connected with a power factor current detection end of the controller;

the first voltage detection circuit is connected with one end of the first capacitor (EC 1) so as to divide the voltage of the stabilized output of the first capacitor (EC 1) and then output the divided voltage to a power factor voltage detection end of the controller.

6. The smart low-carbon digital power charger of silicon carbide as claimed in claim 1, wherein the output rectifying circuit comprises:

the source electrode of the MOS switch tube (Q3) is connected with one end of a secondary coil of the transformer, and the other end of the secondary coil of the transformer is connected with a reference ground;

one end of the second capacitor (EC 3) is connected with the drain electrode of the MOS switch tube (Q3), the other end of the second capacitor (EC 3) is connected with the reference ground, and the second capacitor (EC 3) is used for stabilizing voltage and outputting the rectifying power supply of the MOS switch tube (Q3);

and the rectifying driving end of the rectifying controller is connected with the grid electrode of the MOS switch tube (Q3), and the detecting end of the rectifying controller is connected with one end of the secondary coil of the transformer through a first resistor (R21) so as to rectify and output the secondary coil output power supply of the transformer.

7. The silicon carbide smart low-carbon digital power charger of claim 2, wherein the optocoupler feedback circuit comprises:

the light-emitting diode comprises an optical coupler (U2A), wherein the anode of the light-emitting diode end of the optical coupler (U2A) is connected with the anode of a voltage stabilizer (ZD 1), and the cathode of the voltage stabilizer (ZD 1) is connected with the direct current output end of the output rectifying circuit;

the output end of the first comparator is connected with the cathode of a first diode (D8), the anode of the first diode (D8) is connected with the cathode of the light emitting diode end of an optocoupler (U2A), the positive input end of the first comparator is connected with the direct current output end of the output rectifying circuit through a second resistor (R47), the positive input end of the first comparator is also connected with one end of a third resistor (R48), the other end of the third resistor (R48) is connected with one end of a fourth resistor (R49), the other end of the fourth resistor (R49) is connected with a reference ground, the negative input end of the first comparator is connected with one end of a fifth resistor (R45), the other end of the fifth resistor (R45) is connected with the reference ground, and the negative input end of the first comparator is also connected with the direct current output end of the output rectifying circuit through a resistor so as to perform voltage feedback through the optocoupler.

8. The silicon carbide smart low-carbon digital power charger of claim 7, wherein the optocoupler feedback circuit further comprises:

the output end of the second comparator is connected with the cathode of a second diode (D9), the anode of the second diode (D9) is connected with the cathode of the light-emitting diode end of the optocoupler (U2A), the positive input end of the second comparator is connected with the direct current output end of the output rectifying circuit through a second resistor (R47), and the positive input end of the second comparator is connected with one end of the fourth resistor (R49);

and the current detection resistor (R56) is connected in series with the power supply output loop of the output rectifying circuit, and the inverting input end of the second comparator is connected with the current detection resistor (R56) through a resistor so as to perform current feedback through the optocoupler.

9. The smart low-carbon digital power supply charger of claim 8, wherein the optocoupler feedback circuit further comprises an output voltage regulation circuit comprising:

a sixth resistor (R53), one end of the sixth resistor (R53) being connected to the one end of the fourth resistor (R49);

and the drain electrode of the MOS transistor (Q4) is connected with the other end of the sixth resistor (R53), the source electrode of the MOS transistor (Q4) is connected with the reference ground, and the grid electrode of the MOS transistor (Q4) is connected with the voltage regulation signal end through the seventh resistor (R58).

10. The smart low-carbon digital power charger of silicon carbide as claimed in claim 9, further comprising a power output interface circuit comprising:

the direct-current power supply interface is used for being connected with electric equipment, and the voltage regulation signal end is arranged on the direct-current power supply interface;

and the direct-current power supply interface is connected with the direct-current power supply output end of the output rectifying circuit through the common-mode coil.