CN212572167U - High-integration control chip and power supply circuit with same - Google Patents
High-integration control chip and power supply circuit with same Download PDFInfo
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- CN212572167U CN212572167U CN202020068819.2U CN202020068819U CN212572167U CN 212572167 U CN212572167 U CN 212572167U CN 202020068819 U CN202020068819 U CN 202020068819U CN 212572167 U CN212572167 U CN 212572167U
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Abstract
The utility model discloses a high integrated control chip and have its power supply circuit, high integrated control chip includes: the primary constant voltage control module is connected with a primary side voltage feedback end of the switching power supply and the driving module and is used for carrying out constant voltage control processing on the feedback voltage of the primary side voltage feedback end of the switching power supply; the slope compensation module is respectively connected with a primary side voltage feedback end of the switching power supply and the primary constant voltage control module. And performing slope compensation processing on the output voltage according to the primary voltage feedback value, so that the output of the switching power supply circuit sets the voltage value of the slope. Therefore, the requirements of battery charging and motor driving on voltage and current slope can be met. Through the power supply circuit adopting the primary side feedback mode, peripheral circuits such as a feedback optocoupler and the like can be reduced, and peripheral elements of the circuit are reduced.
Description
Technical Field
The utility model relates to a power technical field especially relates to a high integrated control chip and have its power supply circuit.
Background
The integration degree of the existing battery charging and motor product charger is relatively low, and a secondary voltage and current feedback structure is generally adopted for providing a large charging current or driving current. The secondary feedback structure usually needs a secondary feedback detection circuit and a feedback optocoupler, so that a peripheral circuit is complex, components are relatively more, the production efficiency of a whole power supply finished product is low, the labor cost is high, the manufacturing cost is high, the repair rate of the power supply finished product is high, and the comprehensive cost of the product is high. And the prior primary side feedback structure circuit. The output current to the pulse controller is typically limited to a small current output due to considerations of stability of the output voltage, and the charge slope curve is generally non-adjustable. The requirement of charging current of a larger rechargeable battery or the requirement of driving current of a motor cannot be met.
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, an object of the present invention is to provide a highly integrated control chip and a power circuit having the same.
On the one hand, in order to realize above-mentioned purpose, the embodiment of the utility model provides a high integrated control chip, include:
the switching tube is used for being connected with a primary side transformer of the switching circuit so as to control the primary side transformer to generate pulse voltage;
the signal output end of the driving module is connected with the control end of the switch tube and is used for conducting on-off driving control on the switch tube;
the primary constant voltage control module is used for being connected with a primary side voltage feedback end of the switching power supply and the driving module and carrying out constant voltage control processing on the feedback voltage of the primary side voltage feedback end of the switching power supply;
and the slope compensation module is respectively connected with the primary side voltage feedback end of the switching power supply and the primary constant voltage control module so as to perform slope compensation processing on the output voltage.
Further, according to the utility model discloses an embodiment, the high integrated control chip still includes: and the primary constant current control module is used for being connected with a primary current feedback end of the switch circuit and the driving module.
Further, according to the utility model discloses an embodiment, the high integrated control chip still includes: and the primary constant current control module is connected with a primary current feedback end of the switching power supply through the line compensation module so as to perform slope compensation processing on output current.
Further, according to the present invention, the switch tube is a high voltage tolerant power tube.
Further, according to the utility model discloses an embodiment, the high integrated control chip still includes: and the PWM soft start module is connected with the driving module and used for detecting the wave trough of the switching waveform and controlling the conduction of the switching tube through the driving module.
Further, according to the utility model discloses an embodiment, the high integrated control chip still includes: and the frequency jitter control module is connected with the driving module and is used for controlling the switching tube to output modulation pulses with periodically changing frequencies through the driving module.
Further, according to the utility model discloses an embodiment still includes excess temperature protection module, excess temperature protection module with drive module connects for when detecting the high temperature, through drive module control the switch tube ends.
On the other hand, the utility model also provides a power supply circuit, include:
the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;
one end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;
the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current to be output;
in the above highly integrated control chip, one signal output end of the switching tube is connected to the other end of the input end of the transformer, the other signal output end of the switching tube is connected to the reference ground, and the highly integrated control chip is used for controlling the transformer output.
The voltage feedback circuit is connected with the transformer and a voltage feedback end of the high-integration control chip;
and the current feedback circuit is connected with the current feedback end of the high-integration control chip.
Further, according to an embodiment of the present invention, the voltage feedback circuit includes: the voltage detection circuit comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the transformer, the other end of the resistor R4 is connected with the voltage detection end of the voltage detection module and one end of the resistor R5, and the other end of the resistor R5 is connected with a reference ground.
The current feedback circuit includes: and the other signal output end of the switch tube is connected with a reference ground through the resistor R7, and the end, far away from the reference ground, of the resistor R7 is connected with the circuit detection end of the current detection module.
The embodiment of the utility model is connected with the primary voltage feedback end of the switch power supply and the driving module through the primary constant voltage control module, and performs constant voltage control processing on the feedback voltage of the primary voltage feedback end of the switch power supply; the slope compensation module is respectively connected with a primary side voltage feedback end of the switching power supply and the primary constant voltage control module. And performing slope compensation processing on the output voltage according to the primary voltage feedback value, so that the output of the open power circuit sets the voltage value of the slope. Therefore, the requirements of battery charging and motor driving on voltage and current slope can be met. And the power supply circuit adopts a primary side feedback mode, so that the feedback optocoupler lamp peripheral circuit can be reduced, and the peripheral elements of the circuit are reduced.
Drawings
Fig. 1 is a block diagram of a highly integrated control chip according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power circuit structure provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a slope curve of the output power of the power circuit according to the embodiment of the present invention.
Reference numerals:
a direct-alternating current conversion circuit 10;
a chip start-up circuit 20;
a primary absorption circuit 30;
a voltage transformation circuit 40;
a secondary absorption circuit 50;
a voltage stabilization output circuit 60;
an integrated controller 70;
an auxiliary voltage transformation power supply circuit 80;
a voltage feedback circuit 90;
an electromagnetic filter capacitor circuit 11;
a switch tube 701;
a driver module 702;
a PWM soft start module 703;
a dither frequency control module 704;
an over-temperature protection module 705;
a primary constant voltage control module 706;
a first voltage detection circuit 707;
a primary constant flow control module 708;
a short-circuit protection module 709;
a leading edge blanking module LEB 710;
a first current detection circuit 711;
a second current detection circuit 712;
a chip start module 713;
a clock logic control module 714;
a slope compensation module 715;
a line compensation module 716;
a loop compensation module 717;
an operating voltage generation module 718;
the second voltage detection circuit 719.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
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.
In one aspect, referring to fig. 1 to 3, an embodiment of the present invention provides a high integrated control chip, including: the switching tube 701 is used for being connected with a primary side transformer of a switching circuit so as to control the primary side transformer to generate pulse voltage; as shown in fig. 1 and 2, the collector of the switching tube 701 is used to connect to one end of the primary transformer, and the other end of the primary transformer is connected to the power supply end of the power supply. The emitter of the switch tube 701 is connected to the reference ground, and the current on the primary side transformer is controlled to be switched on and off through the switch tube 701, so as to perform PWM pulse modulation on the primary side transformer.
The signal output end of the driving module 702 is connected with the control end of the switching tube 701 and is used for conducting or stopping driving control on the switching tube 701; the driving module 702 is connected to the gate of the switching tube 701 to control the switching tube 701 to be turned on or off by outputting a PWM control signal, so as to perform PWM pulse modulation on the primary transformer.
The primary constant voltage control module 706 is used for being connected with the primary voltage feedback end of the switching power supply and the driving module 702, and performing constant voltage control processing on the feedback voltage of the primary voltage feedback end of the switching power supply; as shown in fig. 1 and 2, the primary constant voltage control module 706 is connected to the primary voltage feedback terminal of the switching power supply. Therefore, the primary voltage of the switching power supply can be fed back to the primary constant voltage control module 706, and the primary constant voltage control module 706 performs constant voltage output processing according to the primary voltage feedback value, so that the output voltage of the power-on circuit can keep constant voltage output, and thus, the output voltage is stable.
The slope compensation module 715 is respectively connected to the primary voltage feedback end of the switching power supply and the primary constant voltage control module 706, so as to perform slope compensation processing on the output voltage. Referring to fig. 1 to 3, the slope compensation module 715 is respectively connected to the primary voltage feedback terminal of the switching power supply and the primary constant voltage control module 706, so as to perform slope compensation processing on the output voltage according to the primary voltage feedback value, so that the output of the power-on circuit sets a voltage value of a slope. Therefore, the requirements of battery charging and motor driving on voltage and current slope can be met. More specifically, as shown in fig. 3, in practical applications, when the charger is connected to a battery that has just been discharged, or a direct drive motor, the instantaneous output voltage is low, the primary auxiliary winding of the transformer outputs the winding voltage by sensing, and the voltage detection circuit divides the voltage by the voltage dividing resistor, so that the voltage feedback end of the chip feeds back the voltage, and the PWM output of the chip is adjusted by the slope compensation module 715, the voltage control module, and the external resistor, so as to provide a large current or a battery charging current for the start of the motor. When the current is just charged into the discharged battery, the voltage of the battery rises quickly due to voltage drop generated by the internal resistance of the battery. Thereafter, the slope compensation module 715 and the voltage detection module/constant current control module control the output PWM signal to make the output current constant, i.e. constant current charging, the battery starts to receive the charge, and the battery voltage continuously rises at a lower rate. After a certain time, the internal impedance of the battery increases and the battery voltage starts to rise faster. When the battery is fast fully charged, the charger slope compensation module 715/voltage module controls the IC PWM to enter trickle charge: also known as maintenance charging.
The embodiment of the utility model is connected with the primary voltage feedback end of the switch power supply and the driving module 702 through the primary constant voltage control module 706, and performs constant voltage control processing on the feedback voltage of the primary voltage feedback end of the switch power supply; the slope compensation module 715 is respectively connected to the primary voltage feedback terminal of the switching power supply and the primary constant voltage control module 706. The slope compensation processing of the output voltage is carried out according to the primary voltage feedback value, so that the output of the power-on circuit sets the voltage value of the slope. Therefore, the requirements of battery charging and motor driving on voltage and current slope can be met. And the power supply circuit adopts a primary side feedback mode, so that the feedback optocoupler lamp peripheral circuit can be reduced, and the peripheral elements of the circuit are reduced.
Referring to fig. 1 to fig. 3, the high integrated control chip further includes a primary constant current control module 708, and the primary constant current control module 708 is configured to be connected to the primary current feedback terminal of the switching circuit and the driving module 702. As shown in fig. 1 and 2, the primary constant current control module 708 is connected to the primary current feedback terminal of the switching power supply. Therefore, the primary current of the switching power supply can be fed back to the primary constant voltage control module 706, and the primary constant voltage control module 706 performs constant current output processing according to the primary current feedback value, so that the output current of the power-on circuit can keep constant current output, and thus, the output current is stable.
Referring to fig. 1 to 3, the highly integrated control chip further includes: and the line compensation module 716, the primary constant current control module 708 is connected to the primary current feedback end of the switching power supply through the line compensation module 716, so as to perform slope compensation processing on the output voltage. The line compensation module 716 is connected to the primary side current feedback end of the switching power supply and the primary constant voltage control module 706, respectively, to perform slope compensation processing of the output current according to the primary side current feedback value, so that the output of the switching power supply circuit sets a voltage value of a slope, and thus, the current slope requirements of battery charging and motor driving can be satisfied. As shown in fig. 3, in the battery charging and motor driving, the slope control is performed on the output current through the line compensation module 716 and the primary constant current control module 708, so as to meet the current slope requirements of the battery charging and motor driving, achieve the safe charging of the battery, ensure the charging safety of the battery, and prolong the service life of the battery. As shown in the graph of fig. 3, the battery charging curve can be divided into three phases:
1. trickle charge stage: in FIG. 3, the current amount ranges from 0 to 0.2 Io; at this time, the battery is fully charged, and the output current is in a maintenance state.
2. And a quick charging stage: in the figure 3, the current amount is between 0.2 Io and Io at the positions of (I) and (II); at this time, the battery is charged quickly.
3. The direct drive motor provides a large current or a battery just discharges the large current charging stage: in fig. 3, the current amounts from Io to 3 × Io are shown, and when the charging is started, a large current is supplied to perform the charging and/or the motor driving.
Further, in an embodiment of the present invention, the switch tube 701 is a high voltage tolerant power tube. By adopting the power tube capable of bearing high voltage, the transformer can be connected to a high-voltage power supply through the primary side transformer. Realize the transformation output of high-voltage electricity. The high-voltage power supply can bear high pulse power supply impact, the phenomenon that the switch tube 701 cannot work normally due to breakdown is avoided, the number of primary absorption circuits 30 is reduced, the circuit is simpler, the number of components is relatively small, the production efficiency of the whole power supply finished product is low, the repair rate of the power supply finished product is low, and the comprehensive cost of the product is low. In one embodiment of the present invention, the switch tube 701 is a high voltage power tube capable of withstanding 800V.
Referring to fig. 1 and 2, the high integrated control chip further includes: a PWM (pulse-width modulation) soft start module, in which a PWM soft start module 703 is connected to a driving module 702 for detecting the wave trough of the switching waveform and controlling the conduction of the switching tube 701 through the driving module 702. As shown in fig. 1, the PWM soft start module 703 detects the trough of the switching waveform. For example, the PWM soft start module 703 may obtain the valley information of the waveform on the switching tube 701 by detecting the power switch waveform on the switching tube 701, and when the switching waveform is detected to be at the valley, the switching tube 701 is turned on by the driving module 702 at this time, so as to reduce the switching conduction loss of the switching tube 701. Because switch tube 701 has certain on-resistance, certain conduction loss can be produced when switching on to on resistance, in practical application, the conduction loss of switch tube 701 should be reduced as far as possible, when detecting through PWM soft start module 703 that the waveform on switch tube 701 is in the valley value, at this moment, switch tube 701 says through to reduce the switching loss of switch tube 701, improved switch tube 701's energy conversion efficiency.
Referring to fig. 1 and 2, the high integrated control chip further includes: the dither frequency control module 704 is connected to the driving module 702, and the dither frequency control module 704 is configured to control the switching tube 701 to output a modulation pulse with a periodically changing frequency through the driving module 702. Because the traditional pulse generator mainly generates a fixed working frequency to pulse the high-voltage direct-current power supply. The modulated pulse direct current is concentrated on a fixed frequency due to energy, so that a modulated power supply signal output by the transformer generates a strong electromagnetic interference signal, and the electromagnetic compatibility detection of the electronic equipment cannot be passed due to the excessively high electromagnetic interference signal. At this time, the electromagnetic interference signal may be filtered by the electromagnetic filter capacitor circuit 11. But adds peripheral circuits to the power converter, resulting in high cost and complex circuit configuration. The embodiment of the utility model provides an in, the pulse modulation signal that produces the periodic variation through trembling frequently control module 704 and drive module 702, the transfer of frequency is realized through the pulse modulation signal that changes periodically to reduce electromagnetic interference signal's production. According to different output loads, the working frequency of the primary high-integration control chip IC is changed, and the working frequency is high when the load is heavy; the load is light, the working frequency is low, so that the EMI (Electro Magnetic Interference) noise of the switch circuit is reduced, the electromagnetic filter capacitor circuit 11 and the secondary absorption circuit 50 can be omitted, the number of components is relatively small, the production efficiency of the whole power supply finished product is low, the repair rate of the power supply finished product is low, and the comprehensive cost of the product is low.
Referring to fig. 1 and 2, the highly integrated control chip further includes an over-temperature protection module 705, where the over-temperature protection module 705 is connected to the driving module 702 and is configured to control the switching tube 701 to be turned off through the driving module 702 when detecting that the temperature is too high. The over-temperature protection module 705 is configured to detect a temperature value of the high-integration power converter, and control the switching tube 701 to be turned off by the driving module 702 when the temperature value is higher than a set value, so as to implement over-temperature protection on the circuit.
On the other hand, referring to fig. 2, an embodiment of the present invention further provides a power circuit, including: the high-integration control chip comprises an alternating current-direct current conversion circuit, a transformer, an output voltage stabilizing circuit, a voltage feedback circuit 90 and a current feedback circuit, wherein the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current; as shown in fig. 2, the ac-dc conversion circuit is connected to an ac output terminal through a power interface (L/N), and the ac may be a commercial ac. In an embodiment of the utility model, the alternating current-direct current converting circuit includes bridge rectifier circuit BD1 and voltage stabilizing circuit, and bridge rectifier circuit BD1 rectifies the input alternating current into pulse direct current power supply to export pulse direct current power supply to voltage stabilizing circuit, arrange into steady voltage high voltage direct current through voltage stabilizing circuit, and export steady voltage high voltage direct current to the transformer. The voltage stabilizing circuit comprises an inductor L1 and a capacitor EC2, and a low-pass filter circuit is formed by the inductor L1 and the capacitor EC 2. Therefore, a high-frequency power supply signal in the power supply signal at the output end of the bridge rectifier circuit BD1 is filtered, and a stable direct-current power supply is output.
One end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer T1 is used for converting the high-voltage direct current into pulse direct current; the transformer performs pulse adjustment and variable voltage output of high-voltage direct current under the action of pulse signals of the high-integration control chip.
The input end of the output voltage stabilizing circuit is connected with the output end of the transformer T1, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current for output; the output voltage stabilizing circuit receives the pulse adjusting power supply signal output by the transformer and stabilizes the voltage of the pulse adjusting power supply signal to output stable direct current so as to supply power to power supply equipment. As shown in fig. 2, in an embodiment of the present invention, the output voltage stabilizing circuit includes a diode D7 and a capacitor EC4, the anode of the diode D7 is connected to the secondary output terminal of the transformer, the cathode of the diode D7 is connected to one end of the capacitor EC4, and the end of the capacitor EC4 is connected to the ground. The diode D7 prevents the electric quantity in the capacitor EC4 from flowing back to the transformer, and stabilizes and outputs the pulse dc at the output of the transformer 50.
One signal output end of a switch tube 701 of the high-integration control chip U1 is connected with the other end of the input end of the transformer, the other signal output end of the switch tube 701 is connected with a reference ground, and the high-integration control chip is used for controlling the transformer output of the transformer.
The voltage feedback circuit 90 is connected with the transformer T1 and the high integrated control chip U1; the voltage on the primary transformer is fed back to the high integrated control chip through the voltage feedback circuit 90 to perform constant voltage and voltage slope control through the high integrated control chip.
The current feedback circuit is connected with the high integrated control chip T1. The current on the primary side transformer is fed back to the high integrated control chip through the current feedback circuit, so that constant current and current slope control are carried out through the high integrated control chip.
Referring to fig. 2, the voltage feedback circuit 90 includes: the voltage detection circuit comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the transformer, the other end of the resistor R4 is connected with the voltage detection end of the voltage detection module and one end of the resistor R5, and the other end of the resistor R5 is connected with a reference ground. As shown in fig. 2, the resistor R4 and the resistor R5 are connected in series to divide the voltage across the transformer and output the divided voltage to the voltage feedback terminal of the main control circuit. The voltage is divided by the resistor R4 and the resistor R5 and then fed back to the main control circuit, so that the feedback power supply can meet the voltage requirement of a high-integration control chip.
Referring to fig. 2, the current feedback circuit includes: the other signal output end of the switch tube 701 is connected with the reference ground through a resistor R7, and the end, far away from the reference ground, of the resistor R7 is connected with the circuit detection end of the current detection module. The current feedback circuit is arranged between the high-integration control chip and the reference ground to feed the current of the switching tube 701 on the high-integration control chip back to the current detection end of the high-integration control chip, so that the high-integration control chip adjusts the output pulse width according to the feedback current value. So that the output supply current remains stable.
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 content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection 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 (9)
1. A highly integrated control chip, comprising:
the switching tube is used for being connected with a primary side transformer of the switching circuit so as to control the primary side transformer to generate pulse voltage;
the signal output end of the driving module is connected with the control end of the switch tube and used for conducting on-off driving control on the switch tube;
the primary constant voltage control module is used for being connected with a primary side voltage feedback end of the switching power supply and the driving module and carrying out constant voltage control processing on the feedback voltage of the primary side voltage feedback end of the switching power supply;
and the slope compensation module is respectively connected with the primary side voltage feedback end of the switching power supply and the primary constant voltage control module so as to perform slope compensation processing on the output voltage.
2. The highly integrated control chip according to claim 1, further comprising: and the primary constant current control module is used for being connected with a primary current feedback end of the switch circuit and the driving module.
3. The highly integrated control chip according to claim 2, further comprising: and the primary constant current control module is connected with a primary current feedback end of the switching power supply through the line compensation module so as to perform slope compensation processing on output current.
4. The highly integrated control chip according to claim 1, wherein the switch tube is a high voltage tolerant power tube.
5. The highly integrated control chip according to claim 1, further comprising: and the PWM soft start module is connected with the driving module and used for detecting the wave trough of the switching waveform and controlling the conduction of the switching tube through the driving module.
6. The highly integrated control chip according to claim 1, further comprising: and the frequency jitter control module is connected with the driving module and is used for controlling the switching tube to output modulation pulses with periodically changing frequencies through the driving module.
7. The highly integrated control chip according to claim 1, further comprising an over-temperature protection module, wherein the over-temperature protection module is connected to the driving module, and is configured to control the switching tube to be turned off by the driving module when detecting that the temperature is too high.
8. A power supply circuit, comprising:
the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;
one end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;
the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current to be output;
the highly integrated control chip of any one of claims 4 to 7, wherein one signal output end of the switch tube is connected with the other end of the input end of the transformer, the other signal output end of the switch tube is connected with a reference ground, and the highly integrated control chip is used for controlling the transformer output of the transformer;
the voltage feedback circuit is connected with the transformer and a voltage feedback end of the high-integration control chip;
and the current feedback circuit is connected with the current feedback end of the high-integration control chip.
9. The power supply circuit of claim 8, wherein the voltage feedback circuit comprises: the resistor R4 and the resistor R5, one end of the resistor R4 is connected with one end of the transformer;
the current feedback circuit includes: and the other signal output end of the switch tube is connected with the reference ground through the resistor R7 and the resistor R7.
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