CN110752760A - Switching power supply circuit and switching power supply thereof - Google Patents

Switching power supply circuit and switching power supply thereof Download PDF

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Publication number
CN110752760A
CN110752760A CN201911056794.2A CN201911056794A CN110752760A CN 110752760 A CN110752760 A CN 110752760A CN 201911056794 A CN201911056794 A CN 201911056794A CN 110752760 A CN110752760 A CN 110752760A
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China
Prior art keywords
resistor
capacitor
pin
diode
circuit
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CN201911056794.2A
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Chinese (zh)
Inventor
李骞
王慧
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Kai Hui Electronics Co Ltd Guangzhou
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Kai Hui Electronics Co Ltd Guangzhou
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Priority to CN201911056794.2A priority Critical patent/CN110752760A/en
Publication of CN110752760A publication Critical patent/CN110752760A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a switching power supply circuit and a switching power supply thereof. The primary circuit comprises an electromagnetic filter rectifying circuit, an interleaved power factor correction circuit, a resonance conversion circuit and a protection circuit. The electromagnetic filter rectification circuit carries out filter rectification on alternating current input to generate a pulsating direct current signal. The interleaved power factor correction circuit converts the pulsating direct current signal into direct current level and simultaneously carries out power factor correction. The resonance conversion circuit performs high-frequency switching on the direct current level, so that the direct current level is converted into a high-frequency square wave signal. The protection circuit is responsible for detecting and protecting the primary circuit. The secondary circuit comprises a photoelectric isolation feedback circuit and a synchronous rectification filter circuit. After the high-frequency square wave signals are coupled through a high-frequency isolation transformer, the high-frequency square wave signals are rectified and filtered in a secondary synchronous rectification filter circuit, and finally, direct current is output. The photoelectric isolation feedback circuit is used for sampling direct current output and feeding back the direct current output to the resonance conversion circuit. The invention realizes closed-loop control and overload protection, protects the circuit on one hand, and can stabilize direct current output on the other hand, thereby avoiding damage to the carrier.

Description

Switching power supply circuit and switching power supply thereof
Technical Field
The invention relates to a power supply circuit in the technical field of circuits, in particular to a switching power supply circuit and a switching power supply of the circuit.
Background
A switching power supply is a high-frequency power conversion device, and is one of power supplies. The function of the switching power supply is to convert a level voltage into a voltage or current required by the user terminal through different types of architectures. The input of the switching power supply is mostly an ac power supply (e.g., commercial power) or a dc power supply, and the output is mostly equipment requiring a dc power supply, such as a personal computer, and the switching power supply performs voltage and current conversion between the two.
The switching power supply circuit generally comprises a main circuit, a control circuit, a detection circuit and an auxiliary power supply. The main circuit carries out impact current amplitude limiting, noise waves existing in a power grid are filtered through an input filter, noise waves generated by the main circuit are prevented from being fed back to the power grid, then rectification and filtering are carried out, high-frequency switch inversion is carried out, and finally output rectification and filtering are carried out. However, the existing switching power supply circuit has the problems of low efficiency and easy overload of output power.
Disclosure of Invention
The invention provides a switching power supply circuit and a switching power supply thereof, aiming at solving the technical problems that the existing switching power supply circuit is low in efficiency and easy to overload output power.
The invention is realized by adopting the following technical scheme: a switching power supply circuit, comprising:
a primary circuit for filtering, correcting and converting an externally input ac input to generate a high frequency square wave signal; the primary circuit comprises an electromagnetic filter rectifying circuit, an interleaved power factor correction circuit and a resonance conversion circuit; the electromagnetic filter rectifying circuit is used for filtering the alternating current input to inhibit common mode noise from the alternating current input and generating a pulsating direct current signal which is transmitted to the interleaved power factor correction circuit; the interleaved power factor correction circuit is used for performing power factor correction on the pulsating direct current signal, keeping 180-degree reverse phase operation and converting the pulsating direct current signal into a direct current level; the resonance conversion circuit performs high-frequency switching on the direct current level, so that the direct current level is converted into a high-frequency square wave signal, and the high-frequency square wave signal is coupled to a secondary side through a high-frequency isolation transformer. The protection circuit is responsible for detecting primary voltage and current signals and protects the primary circuit in time when abnormality occurs.
The secondary circuit is used for rectifying and outputting the high-frequency square wave signal and feeding back the rectified direct current output to the resonance conversion circuit; the secondary circuit comprises a photoelectric isolation feedback circuit and a synchronous rectification filter circuit; after the high-frequency square wave signal is coupled through the high-frequency isolation transformer, rectifying and filtering output are carried out in the synchronous rectifying and filtering circuit; the photoelectric isolation feedback circuit is used for sampling the direct current output of the synchronous rectification filter circuit and enabling the resonant conversion circuit to adjust the high-frequency square wave signal according to feedback by feeding back a corresponding photoelectric conversion signal to the resonant conversion circuit.
The invention filters the AC input through the electromagnetic filter rectifying circuit of the primary circuit to inhibit the common mode noise in the signal, and further performs power factor correction on the signal through the staggered power factor correction circuit, staggers two boosting power levels to reduce the volume of a boosting capacitor, finally performs power conversion, resonance processing and rectification through the resonance conversion circuit, can avoid switching loss, improve efficiency, reduce the volume of a magnetic element and the volume of a filter capacitor, thereby generating a high-frequency square wave signal, performs high-frequency isolation on the high-frequency square wave signal by the secondary circuit, then performs rectification and output, simultaneously samples the output condition by using the photoelectric isolation feedback circuit, generates a feedback signal value according to the sampling signal in the resonance conversion circuit, thereby adjusting the high-frequency square wave signal to avoid overload, realizes closed-loop control, and solves the problem of low efficiency of the existing switching power supply circuit, the technical problem that the output power is easy to overload is solved, and the technical effects of high efficiency and overload protection are achieved.
As a further improvement of the above solution, the electromagnetic filter rectification circuit includes fuse tubes F, zener diode Z, switch K, resistors R, RS, thermistor NTC, capacitors C, CY, LF, transformers LF, rectifier bridge, diodes D, D3, D, fet Q, interfaces CON, CON;
pin 1 of the interface CON1 is connected to FG ground, pin 2 is connected to the zero line signal of the ac input, and pin 3 is connected to the live line signal of the ac input; one end of the fuse tube F1 is connected with pin 3 of the interface CON 1; the pin 2 of the interface CON1 at one end of the fuse F3 is connected, and the other end is connected with one end of the thermistor NTC 1; the voltage stabilizing diode Z1 and the capacitor C4 are connected in parallel, one end of the parallel connection is connected with the other end of the fuse F1, and the other end of the parallel connection is connected with the other end of the thermistor NTC 1; pin 1 of the switch K1 is connected with PG ground, pin 2 is connected with one end of a resistor R33, pin 4 is connected with one end of NTC1, and pin 3 is connected with the other end of NTC 1; one end of the resistor R33 is also connected with the cathode of the diode D1, and the other end is connected with a voltage VCC 1; the anode of the capacitor C55 is connected with the voltage VCC1, and the cathode is connected with PG ground; the anode of the diode D1 is connected with PG ground; one end of the resistor R1 is connected with one end of the resistor R6, and the other end of the resistor R1 is connected with the other end of the fuse F1; the other end of the resistor R6 is connected with one end of a resistor R87 and a pin 3 of a switch K1; the other end of the resistor R87 is connected with one end of the resistor R86, and the other end of the resistor R86 is connected with the other end of the resistor R1; the input two ends of the transformer LF1 are respectively connected with one end of a resistor R87 and the other end of a resistor R86, and the output two ends are respectively connected with the same ends of a capacitor CY1 and a capacitor CY 2; the other ends of the capacitor CY1 and the capacitor CY2 are connected, and the connection point is connected with FG ground; the input two ends of the transformer LF2 are respectively connected with the same ends of the capacitor CY1 and the capacitor CY2, and the output two ends of the transformer LF2 are respectively connected with the input two ends of the rectifier bridge BD 1; one output end of the rectifier bridge BD1 is connected with one input end of the transformer LF3, and the other output end of the rectifier bridge BD1 is used as a current detection end and connected with the cathode of the diode D4; one end of the capacitor C3 is connected with one output end of the rectifier bridge BD1 and is connected with a voltage VBUS, and the other end of the capacitor C3 is connected with the current detection end; the resistor RS1, the resistor RS2 and the diode D4 are connected in parallel, and the anode of the diode D4 is connected with one output end of the transformer LF 3; the other input end of the transformer LF3 is connected with one end of a resistor R3, and the other end of the resistor R3 is connected with the anode of a diode D5; the other output end of the transformer LF3 is connected with the drain electrode of the field effect transistor Q1; the grid of the field effect transistor Q1 is connected with one end of the resistor R9 and connected with the output driving end GDB generated by the staggered power factor correction circuit, and the other end of the resistor R9 is connected with the anode of the diode D4; the source electrode of the field effect transistor Q1 is connected with the other end of the resistor R9 and is connected with one end of the capacitor C1; the other end of the capacitor C1 is connected with the anode of the diode D3A and the drain of the field effect transistor Q1; the resistors R2, R7 and R85 are connected in parallel, one end of the parallel connected resistors is connected with the anode of the diode D3A, and the other end of the parallel connected resistors is connected with one end of the capacitor C2; the other end of the capacitor C2 is connected with the positive electrode of the capacitor C6, and the negative electrodes of the capacitors C5 and C6 are connected with PG ground; the anode of the capacitor C5 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected with the voltage VBUS; one end of the resistor R4 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R11; the other end of the resistor R11 is connected with one end of the resistor R21, and the other end of the resistor R21 is connected with one end of the resistor R28; resistor 28 is connected in parallel with capacitor C14, and the other terminal is PG ground; one end of the resistor R5 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R10; the other end of the resistor R10 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with one end of the resistor R26; the resistor 26 is connected with the capacitor C15 in parallel, and the other end of the resistor is connected with PG ground; one end of the resistor R8 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R20; the other end of the resistor R20 is connected with one end of a resistor R27; one end of the fuse F2 is connected to the cathode of the diode D2, and the other end is connected to pin 1 of the interface CON 5; one end of the capacitor C50 is connected with the cathode of the diode D2, and the other end is connected with the anode of the diode D18; the cathode of the diode D18 is connected with one end of the capacitor C59 and is connected with a preset voltage; pin 2 of the interface CON5 and the other end of the capacitor C59 are connected to PG ground, and the cathode of the diode D2 is connected to the preset voltage;
the FG ground and the PG ground are connected through a capacitor CY 3; the cathode of the diode D5 and one input end of the transformer LF3 output the pulsating direct current signal, and the other end of the resistor R27 outputs the interleaved control signal.
As a further improvement of the above scheme, the interleaved power factor correction circuit includes a PFC control chip U1, resistors R13, R14, R15, R16, R17, R18, R19, R23, R24, R25, R29, capacitors C29, diodes D29, D3 29, a transformer 36lf, a triode Q29, and a field effect transistor Q29;
the PFC control chip U1 is an interactive PFC chip UCC 28061; pin 1 of PFC control chip U1 is connected to one end of resistor R18 and one end of capacitor C9, pin 2 is used as a voltage detection terminal, pin 3 is connected to one end of resistor R24, pin 4 is connected to a reference voltage VREF, pin 5 is connected to one end of resistor R72, one end of capacitor C13 and one end of resistor R30, pin 6 is connected to PG ground, pin 7 is connected to one end of capacitor C18, one end of resistor R32 and one end of resistor R25, pin 8 is used as a high voltage detection terminal, pin 9 is left empty, pin 10 is connected to one end of capacitor C17 and one end of resistor R31, pin 11 is connected to one end of resistor R89, pin 12 is connected to the same end of capacitors C19 and C52 and connected to a voltage VCC1, pin 13 is connected to one end of capacitor C12 and connected to PG ground, pin 14 is connected to one end of resistor R90, pin 15 is connected to the other end of capacitor 12 and connected to VREF, pin 16 is connected to the other end of capacitor C10 and connected to the reference voltage VREF, The cathode of the diode D6 is connected;
one input end of the transformer LF4 and one end of the capacitor C9 are used as signal receiving ends of the interleaved power factor correction circuit and are used for receiving the pulsating direct current signal; the other end of the capacitor C9 is connected with one end of the capacitor C10, and the connection point is connected with PG ground; the other end of the resistor R18 is connected with one end of the resistor R19, the connection point is connected with PG ground, and the other end of the resistor R19 is connected with the other end of the capacitor C10; the anode of the diode D6 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the other input end of the transformer LF 4; the other end of the resistor R24 and the other end of the capacitor C13 are connected with PG ground; the other end of the resistor R30 is connected with one end of the capacitor C16, and the other end of the capacitor C16 is connected with PG ground; the other end of the resistor R72 is connected with the collector of the triode Q11, and the base of the triode Q11 is connected with one end of the capacitor C56, one end of the resistor R73 and one end of the capacitor C57; the emitter of the triode Q11, the other end of the capacitor C56 and the other end of the resistor R73 are connected with PG ground; the other end of the capacitor C57 is connected with one end of a resistor R74, and the other end of the resistor R74 is connected with a voltage VCC 1; the other end of the resistor R32, the other end of the capacitor C18, the other end of the capacitor C17, the other end of the capacitor C19 and the other end of the capacitor C52 are connected in parallel with PG ground; the other end of the resistor R25 is connected with one end of the resistor R23, the resistor R23 is connected with one end of the resistor R15, and the other end of the resistor R15 is connected with a voltage VBUS; the other end of the resistor R89 is connected with one end of the resistor R68, the other end of the resistor R68 is connected with the anode of the diode D8 and serves as an output driving end GDB, and the cathode of the diode D8 is connected with one end of the resistor R68; the other end of the resistor R90 is connected with one end of the resistor R67 and the cathode of the diode D7, and the other end of the resistor R67 and the anode of the diode D7 are connected and serve as an output driving end GDA; one output end of the transformer LF4 is connected with the anode of the diode D3B, and the other output end is connected with PG ground; the anode of the diode D3B is connected with the drain of the field effect transistor Q2, one end of the capacitor C17 and one end of the resistors R13, R16 and R84; the source electrode of the field effect transistor Q2, the other end of the capacitor C7 and one end of the resistor R17 are grounded; the grid of the field effect transistor Q2 is connected with the other end of the resistor R17 and connected with the output driving end GDA; the other ends of the resistors R13, R16 and R84 are connected with one end of a capacitor C8, and the other end of the capacitor C8 is connected with a preset voltage; the anode of the capacitor C11 and the cathode of the diode D3B are connected to the preset voltage, and the cathode of the capacitor C11 is connected to PG ground.
As a further improvement of the above scheme, the resonance conversion circuit includes a resonance chip U3 HR1001, resistors R36, R38, R45, R51, R52, R53, R54, R55, R59, R60, R62, R63, R64, R65, R66, R82, R83, a phototransistor U6B, capacitors C27, C33, C34, C35, C36, C37, C38, C39, C42, C43, C44, C45, C46, C47, C53, C54, C89, C90, diodes D14, D20, D21, field effect transistors Q5, Q9;
the resonance chip U3 adopts a resonance controller chip HR 1001; pin 1 of resonant chip U3 is connected to one end of capacitor C36 and one end of resistor R45, pin 2 is connected to one end of resistor R54 and one end of capacitor C37, pin 3 is connected to one end of capacitor C37, pin 4 is connected to the other end of resistor R45, one end of resistor R62 and one end of resistor R55, pin 5 is connected to one end of capacitor C42 and one end of resistor R53, pin 6 is connected to one end of capacitor C44 and one end of resistor R60, pin 7 is connected to one end of resistor R65 and one end of capacitor C45, pin 8 is connected to one end of resistor R66, one end of capacitor C46 and the emitter of photo transistor U6B, pin 9 is connected to one end of capacitor C34 and the cathode of diode D14, pin 10 is connected to PG ground, pin 11 is connected to one end of resistor R83, pin 12 is connected to a voltage, pin 13, pin 14 is connected to one end of capacitor C34 and one end of capacitor C27, pin 15 is connected with one end of resistor R82, and pin 16 is connected with the other end of capacitor C27;
the other end of the capacitor C36, the other end of the resistor R54, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the resistor R62, the other end of the capacitor C42, the other end of the capacitor C44, the other end of the resistor R65, the other end of the capacitor C45, the other end of the resistor R66, the other end of the capacitor C46, the cathode of the capacitor C54, one end of the capacitor C47, one end of the capacitor C53, one end of the resistor R63, one end of the resistor R64, and one end of the capacitor C43 are connected to PG ground; the other end of the resistor R53 and the other end of the resistor R55 are connected, and are connected with the other end of the capacitor C43; the other end of the resistor R60 is connected with one end of the capacitor C39, the other end of the resistor R63 and the other end of the resistor R64; the collector of the phototriode U6B is connected with one end of a resistor R59, and the other end of the resistor R59 is connected with the anode of a capacitor C54, the other end of the capacitor C47 and the other end of a capacitor C53 and is connected with a voltage VCC; the positive electrode of the diode D14, one end of the resistor R52, the source of the field effect transistor Q9, one end of the capacitor C90, one end of the capacitor C33 and one end of the capacitor C35 are connected with PG ground; the other end of the resistor R83 is connected with the cathode of the diode D21, one end of the resistor R51 and the other end of the resistor R52; the anode of the diode D21 is connected with the other end of the resistor R51 and is connected with the gate of the field effect transistor Q9; the drain of the field effect transistor Q9 is connected with the pin 14 of the resonant chip U3, one end of the resistor R36, the other end of the capacitor C90, one end of the capacitor C89 and the source of the field effect transistor Q5; the other end of the resistor R82 is connected with the other end of the resistor R36, one end of the resistor R38 and the cathode of the diode D20; the anode of the diode D20 is connected with the other end of the resistor R38 and is connected with the gate of the field effect transistor Q5; the other end of the capacitor C89 is connected with the drain electrode of the field effect transistor Q5 and is connected with a preset voltage;
the other end of the capacitor C33 is connected to the other end of the capacitor C35 and the other end of the capacitor C39, the connection point and the other end of the capacitor C90 output the high-frequency square wave signal, and the two ends of the capacitor C43 are used for receiving the photoelectric conversion signal.
As a further improvement of the above scheme, the synchronous rectification filter circuit includes a synchronous rectification chip U4MP6924, resistors R, VR, capacitors C, CY, fets Q, diodes ZD, D, bidirectional diodes D, light emitting diode U6, zener diode U, and light emitting diode LED;
pin 1 of the synchronous rectification chip U4 is connected with one end of a resistor R46 and one end of a resistor R49, pin 2 is grounded, pin 3 is connected with one end of a resistor R80 and one end of a capacitor C49, pin 4 is connected with one end of a resistor R39, pin 5 is grounded, pin 6 is connected with one end of a resistor R40, pin 7 is connected with a voltage VEE, and pin 8 is connected with one end of a resistor R47 and one end of a resistor R50;
the other end of the resistor R46 is connected with the grid of the field effect transistor Q10, and the other end of the resistor R49 is connected with the grid of the field effect transistor Q8; the other end of the resistor R80, the other end of the capacitor C49, the source electrode of the field-effect transistor Q8 and the source electrode of the field-effect transistor Q10 are grounded; the drain electrode of the field effect transistor Q8 and the drain electrode of the field effect transistor Q10 are connected, and the connection point is used as the first input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the other end of the resistor R47 is connected with the grid of the field effect transistor Q6, and the other end of the resistor R50 is connected with the grid of the field effect transistor Q7; the other end of the resistor R40 is connected with the drain electrode of the field effect transistor Q6 and the drain electrode of the field effect transistor Q7, and the connection point is used as a second input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the anode of the light emitting diode LED1 is connected with the anode ends of the capacitors C31, C28, C29, C51 and C30 and one ends of the resistors R41, R42 and R43, and the connection point is used as the third input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the negative electrode of the light emitting diode LED1 is connected with one end of a resistor R48, the other end of the resistor R48, the negative electrodes of capacitors C31, C28, C29, C51 and C30 and the other ends of the resistors R41, R42 and R43 are grounded; the third input end is connected with one end of a resistor R34, the other end of the resistor R34 is connected with one end of a resistor R71, one end of a capacitor C25, one end of a capacitor C23, one end of a resistor R35, the anode of a capacitor C24 and the cathode of a diode D11, and a voltage VEE is connected in; the anode of the diode D11 is used as the fourth input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the other end of the capacitor C25, the other end of the capacitor C23, the other end of the resistor R35 and the negative electrode of the capacitor C24 are grounded; the other end of the resistor R71 is connected with one end of a resistor R76, one end of a resistor R75, the cathodes of diodes D15, D17, D16 and D19, the anode of a capacitor C48 and one end of resistors R77, R78 and R79, and a voltage V2 is output from the connection point; the other end of the resistor R76 is connected with the cathode of the diode D12 and the anode of the capacitor C58, and outputs a voltage V3; the anode of the diode D17 is connected with the same anode of the bidirectional diode D15 and D16, and the anode of the diode D19 is connected with the same other anode of the bidirectional diode D15 and D16; the negative electrode of the capacitor C48 and the other ends of the resistors R77, R78 and R79 are grounded; the other end of the resistor R75 is connected with one end of the resistor R29 and one end of the resistor R37, and the other end of the resistor R29, one end of the capacitor CY5 and one end of the capacitor C32 are all connected with the input end three and output a voltage VO; the other end of the resistor R37 is connected with one end of a resistor R44, one end of a resistor R61 and one end of a capacitor C41; the other end of the resistor R61 is connected with one end of a capacitor C40, and the other end of the capacitor C41 is connected with the other end of the capacitor C40 and one end of a resistor R58; the other end of the resistor R58 is connected with one end of the resistor R57 and the anode of the diode ZD1, and the cathode of the diode ZD1 is connected with a voltage VEE; the other end of the resistor R57 and one end of the resistor R58 output the sampling signal to the photoelectric isolation feedback circuit; the other end of the capacitor C40 is connected with the cathode of the voltage stabilizing diode U7, and the anode of the voltage stabilizing diode U7 is connected with the cathode of the light emitting diode U6A and is grounded; the anode of the light emitting diode U6A is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the anode of a diode ZD 2; the cathode of the diode ZD2 is connected with one end of a capacitor CY5, and the other end of the capacitor CY5 is connected with one end of a capacitor CY6 and connected in parallel with FG ground; the other end of the capacitor CY6 is connected with the opposite end and the sliding end of the sliding rheostat VR1 and grounded, and the opposite end of the sliding rheostat VR1 is connected with the other end of the resistor R44; the other terminal of the capacitor C32 is connected to ground.
As a further improvement of the above scheme, the high-frequency transformation isolation circuit comprises an inductor L3 and a transformer LF 5; the transformer LF5 includes coils T3A, T3B, T3C and T3D; one end of an inductor L3 is connected with one end of a coil T3A, and the other end of an inductor L3 and the other end of the coil T3A are used as the input two ends of the high-frequency voltage transformation isolation circuit and are used for receiving the high-frequency square wave signal; the coils T3B and T3C are connected in series, and two ends and a connection point of the circuit after the coils are connected in series and two ends of the coil T3D are used as output ends of the high-frequency voltage transformation isolation circuit and output signals to the synchronous rectification filter circuit.
As a further improvement of the above solution, the optoelectronic isolation feedback circuit comprises a light emitting diode U5A and a photodiode U5B; the light emitting diode U5A is used for sampling the output condition of the synchronous rectification filter circuit and emitting corresponding light to the photosensitive diode U5B, and the photosensitive diode U5B generates corresponding conversion signals according to the light and acts on the resonance conversion circuit.
As a further improvement of the above aspect, the primary circuit further includes an auxiliary power supply circuit; the auxiliary power supply circuit comprises an auxiliary power supply chip U2, resistors R69 and R70, capacitors C20, C21, C22 and C26, diodes D9, D10, D13, D31 and DZ1, an inductor L2 and an interface TS 1;
the pin 1 of the auxiliary power chip U2 MD12H is connected with the pin 2 and is connected with the cathode of the capacitor C22, one end of the capacitor C21, one end of the capacitor C20, one end of the inductor L2 and the cathodes of the diodes D13 and D31; a pin 3 of the auxiliary power chip U2 is connected with the other end of the capacitor C21 and the anode of the diode DZ1, a pin 4 is connected with the cathode of the diode D9 and the anode of the capacitor C22, and a pin 5 is connected with a pin 6, a pin 7 and a pin 8 and is connected with a preset voltage; the anode of the diode D9 is connected with the cathode of the diode DZ1, the other end of the capacitor C20 and the cathode of the diode D10; the other end of the inductor L2 is connected with the anode of the diode D10, the pin 2 of the interface TS1, one end of the resistor R69, one end of the resistor R70 and the anode of the capacitor C26, and outputs a voltage VCC 1; the anodes of the diodes D13 and D31, the cathode of the capacitor C26, and the other end of the resistor R70 are connected to PG ground, and the other end of the resistor R69 is connected to pin 1 of the interface TS1 and is connected to a voltage VCC.
Furthermore, the synchronous rectification filter circuit also comprises interfaces VO +, VO-, CN2, CN3 and CON 4; the interface VO + is provided with four pins which are mutually connected and used for outputting voltage VO; the interface VO-is provided with four pins which are connected with each other and is connected with the other end of the capacitor C32; interface CN2 has two pins, pin 1 for outputting voltage V3, and pin 2 connected to ground; the interface CN3 has two pins, pin 1 is grounded, pin 2 is connected to the other end of the capacitor CY7 and outputs a voltage V2; the interface CON4 has five pins, pin 1 for outputting the voltage V2, pin 2 connected to pin 3 and connected to the other end of the capacitor C32, and pin 4 connected to pin 5 and connected to one end of the capacitor C32.
The invention also provides a switching power supply comprising the switching power supply circuit.
Compared with the prior art, the switching power supply circuit and the switching power supply thereof have the following beneficial effects:
1. this switching power supply circuit, its primary circuit can filter, rectify and the conversion to external input's alternating current input, and secondary circuit can further carry out the rectification output with the signal after the conversion, utilizes the mode of optoelectronic isolation to feed back the output condition to primary circuit simultaneously to primary circuit adjusts the signal of conversion play, thereby realizes closed-loop control, realizes overload protection, and protection circuit on the one hand, on the other hand can also make output signal can be stable, avoids causing the harm to the carrier.
2. According to the switching power supply circuit, the electromagnetic filter rectification circuit of the primary circuit can filter alternating current input to inhibit common mode noise from the alternating current input, so that external electromagnetic interference introduced from an alternating current power supply line is filtered, external radiation noise of equipment per se can be avoided from interfering other electronic equipment, and normal transmission of signals is guaranteed. The staggered power factor correction circuit of the primary circuit can correct the power factor of a signal and keep the corrected boosting power stage to operate in 180-degree reverse phase, so that two boosting power stages can be staggered, the input and output inductor chain wave current can be eliminated, the boosting inductor and/or electromagnetic wave interference magnetic quantity can be reduced, the size of the boosting capacitor is reduced, and the energy efficiency is easy to realize and improve. This primary circuit's resonance converting circuit can carry out power conversion, resonance treatment and rectification to the signal of input, adopts the LLC circuit structure to have zero voltage switching characteristic moreover, can avoid switching loss to raise the efficiency and switching frequency, and then reduce magnetic element volume and filter capacitor volume, resonance inductance can utilize the leakage inductance of transformer to undertake moreover, makes cost reduction.
3. This switching power supply circuit, its secondary circuit's high frequency vary voltage buffer circuit can pass through high frequency transformer to resonant conversion circuit and keep apart, prevent that secondary circuit's signal or carrier's signal from causing the influence to primary circuit, and synchronous rectification filter circuit can rectify and export the signal through high frequency vary voltage buffer circuit, realize making switching power supply output voltage or current's function, photoelectric isolation feedback circuit can sample the output condition, the sampling signal feeds back to resonant conversion circuit through the means of photoelectric isolation, can realize closed loop feedback when avoiding secondary circuit to cause the influence to primary circuit, thereby realize the adjustment to high frequency square wave signal in order to avoid transshipping, on the one hand make the output more stable, guarantee switching power supply's security that uses, on the other hand has also guaranteed the normal use of carrier.
Drawings
Fig. 1 is a system frame diagram of a switching power supply circuit according to embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a part of an electromagnetic filter rectification circuit of a primary circuit of the switching power supply circuit shown in fig. 1;
fig. 3 is another circuit diagram of a portion of the electromagnetic filter rectifier circuit of the primary circuit of the switching power supply circuit shown in fig. 1;
FIG. 4 is a circuit diagram of an interleaved PFC circuit of the primary circuit of the switching power supply circuit shown in FIG. 1;
fig. 5 is a circuit diagram of a resonant conversion circuit of the primary circuit of the switching power supply circuit shown in fig. 1;
fig. 6 is a circuit diagram of a high-frequency transformation isolation circuit of a secondary circuit of the switching power supply circuit shown in fig. 1;
fig. 7 is a circuit diagram of a synchronous rectification filter circuit of the secondary circuit of the switching power supply circuit shown in fig. 1;
FIG. 8 is a circuit diagram of a photo-electrically isolated feedback circuit of the secondary circuit of the switching power supply circuit shown in FIG. 1;
fig. 9 is a circuit diagram of an auxiliary power supply circuit of the primary circuit of the switching power supply circuit of embodiment 2 of the present invention;
fig. 10 is a circuit diagram of a lightning protection circuit of a primary circuit of a switching power supply circuit according to embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1, the present embodiment provides a switching power supply circuit, which includes a primary circuit and a secondary circuit. The primary circuit is used for filtering, correcting and converting an externally input alternating current input to generate a high-frequency square wave signal, and the secondary circuit is used for rectifying the high-frequency square wave signal and feeding a rectification result back to the resonance conversion circuit to adjust an output signal of the resonance conversion circuit.
The primary circuit comprises an electromagnetic filter rectifying circuit, an interleaved power factor correction circuit and a resonance conversion circuit. The electromagnetic filter rectifying circuit is used for filtering the alternating current input to inhibit common mode noise from the alternating current input and generating a pulsating direct current signal which is transmitted to the interleaved power factor correction circuit. The interleaved power factor correction circuit is used for performing power factor correction on the pulsating direct current signal and keeping the corrected boosting power stage in 180-degree reverse phase operation so as to drive the electromagnetic filter rectification circuit to generate an interleaved control signal transmitted to the resonance conversion circuit. The resonance conversion circuit is used for sequentially carrying out power conversion, resonance processing and rectification on the staggered control signal and generating a high-frequency square wave signal.
Referring to fig. 2 and fig. 3, in the present embodiment, the electromagnetic filter rectifying circuit includes a fuse tube F1, F2, F3, a zener diode Z1, a switch K1, a resistor R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R20, R21, R22, R26, R27, R28, R33, R84, R85, R86, R87, RS1, RS2, a thermistor NTC1, a capacitor C1, C2, C3, C4, C5, C6, C14, C15, C50, C55, C59, CY1, CY2, a rectifier bridge 2, BD 2, a rectifier bridge 2, a rectifier 2, a field effect diode Q2, a field effect diode 2, a diode b 2, a diode 2, a field effect diode 2, a diode b 72, a diode b 2, a. The circuit structure formed by these components will be described below, and the selection of the components in this embodiment may be selected according to actual needs to determine the capacities and types of the components. Of course, in this embodiment and other embodiments, components used in other circuits may also be selected according to actual needs, and redundant descriptions are not provided in the following description. The electromagnetic filter rectifying circuit of the embodiment can filter the alternating current input to inhibit common mode noise from the alternating current input, so that external electromagnetic interference introduced from an alternating current power line is filtered, external radiation noise of equipment per se can be prevented from interfering other electronic equipment, and normal transmission of signals is guaranteed.
Pin 1 of the interface CON1 is connected to FG ground, pin 2 is connected to a zero line signal of ac input, and pin 3 is connected to a live line signal of ac input. One end of the fuse F1 is connected to pin 3 of the interface CON 1. Pin 2 of the interface CON1 at one end of the fuse F3 is connected, and the other end is connected to one end of the thermistor NTC 1. One end of the zener diode Z1 and the capacitor C4 which are connected in parallel is connected with the other end of the fuse F1, and the other end is connected with the other end of the thermistor NTC 1. Pin 1 of switch K1 is connected to PG ground, pin 2 is connected to one end of resistor R33, pin 4 is connected to one end of NTC1, and pin 3 is connected to the other end of NTC 1. One end of the resistor R33 is also connected with the cathode of the diode D1, and the other end is connected with a voltage VCC 1. The positive pole of the capacitor C55 is connected with the voltage VCC1, and the negative pole is connected with PG ground. The anode of the diode D1 is connected to PG ground. One end of the resistor R1 is connected with one end of the resistor R6, and the other end of the resistor R1 is connected with the other end of the fuse F1. The other end of the resistor R6 is connected with one end of the resistor R87 and the pin 3 of the switch K1. The other end of the resistor R87 is connected to one end of the resistor R86, and the other end of the resistor R86 is connected to the other end of the resistor R1. Two input ends of the transformer LF1 are respectively connected with one end of the resistor R87 and the other end of the resistor R86, and two output ends of the transformer LF1 are respectively connected with the same ends of the capacitor CY1 and the capacitor CY 2. The other ends of the capacitor CY1 and the capacitor CY2 are connected, and the connection point is connected to FG ground. Two input ends of the transformer LF2 are respectively connected with the same ends of the capacitor CY1 and the capacitor CY2, and two output ends of the transformer LF2 are respectively connected with two input ends of the rectifier bridge BD 1. One output end of the rectifier bridge BD1 is connected to the input end of the transformer LF3, and the other output end of the rectifier bridge BD1 is connected to the cathode of the diode D4 as a current detection end. One end of the capacitor C3 is connected to the output end of the rectifier bridge BD1 and connected to a voltage VBUS, and the other end is connected to the current detection end. The resistor RS1, the resistor RS2 and the diode D4 are connected in parallel, and the anode of the diode D4 is connected with one output end of the transformer LF 3. The other input end of the transformer LF3 is connected with one end of a resistor R3, and the other end of the resistor R3 is connected with the anode of a diode D5. The other end of the output of the transformer LF3 is connected with the drain of the field effect transistor Q1. In the present embodiment, the transformer LF3 includes a coil T1A and a coil T1B. One end of the coil T1A is connected with one end of the capacitor C3, and the other end of the coil T1A is connected with the drain of the field effect transistor Q1. One end of coil T1B is connected to one end of resistor R3, and the other end of coil T1B is connected to PG ground.
The grid of the field effect transistor Q1 is connected with one end of the resistor R9 and connected with the output driving end GDB generated by the interleaved power factor correction circuit, and the other end of the resistor R9 is connected with the anode of the diode D4. The source of the field effect transistor Q1 is connected to the other end of the resistor R9 and to one end of the capacitor C1. The other end of the capacitor C1 is connected with the anode of the diode D3A and the drain of the field effect transistor Q1. The resistors R2, R7 and R85 are connected in parallel, one end of the parallel connected resistors is connected with the anode of the diode D3A, and the other end of the parallel connected resistors is connected with one end of the capacitor C2. The other end of the capacitor C2 is connected to the positive electrode of the capacitor C6, and the negative electrodes of the capacitors C5 and C6 are connected to PG ground. The anode of the capacitor C5 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the voltage VBUS. One end of the resistor R4 is connected to the cathode of the diode D2, and the other end is connected to one end of the resistor R11. The other end of the resistor R11 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to one end of the resistor R28. Resistor 28 is connected in parallel with capacitor C14 and the other terminal is connected to PG ground. One end of the resistor R5 is connected to the cathode of the diode D2, and the other end is connected to one end of the resistor R10. The other end of the resistor R10 is connected to one end of the resistor R22, and the other end of the resistor R22 is connected to one end of the resistor R26. Resistor 26 is connected in parallel with capacitor C15 and the other terminal is connected to PG ground. One end of the resistor R8 is connected to the cathode of the diode D2, and the other end is connected to one end of the resistor R20. The other end of the resistor R20 is connected to one end of the resistor R27. One end of the fuse F2 is connected to the cathode of the diode D2, and the other end is connected to pin 1 of the interface CON 5. One end of the capacitor C50 is connected to the cathode of the diode D2, and the other end is connected to the anode of the diode D18. The cathode of the diode D18 is connected to one end of the capacitor C59 and receives a predetermined voltage. Pin 2 of the interface CON5 and the other end of the capacitor C59 are connected to PG ground, and the cathode of the diode D2 is connected to a predetermined voltage. FG ground and PG ground are connected by a capacitor CY 3. The cathode of the diode D5 and one input end of the transformer LF3 output pulsating dc signals, and the other end of the resistor R27 outputs interleaved control signals.
Referring to fig. 4, the interleaved power factor correction circuit in the embodiment includes a PFC control chip U1, resistors R13, R14, R15, R16, R17, R18, R19, R23, R24, R25, R29, R30, R31, R32, R67, R68, R72, R73, R74, R84, R89, R90, capacitors C7, C8, C9, C10, C11, C12, C13, C16, C17, C18, C19, C52, C56, C57, diodes D6, D7, D8, D3B, a transformer 4, a transistor Q11, and a field effect transistor Q2. Certainly, in other embodiments, the interleaved power factor correction circuit may also adopt other components to be combined, and can perform power factor correction on a signal, and keep the corrected boost power stage operating in 180 degrees in reverse phase, so that two boost power stages can be interleaved, input and output inductive link wave currents can be eliminated, and further boost inductance and/or electromagnetic wave interference magnetic quantity can be reduced, so that the size of the boost capacitor is reduced, and the implementation is easy and the energy efficiency is improved.
In this embodiment, the PFC control chip U1 is an interactive PFC chip UCC 28061. Pin 1 of the PFC control chip U1 is connected to one end of a resistor R18 and one end of a capacitor C9. Pin 2 of the PFC control chip U1 serves as a voltage detection terminal, pin 3 is connected to one end of a resistor R24, and pin 4 is connected to a reference voltage VREF. Pin 5 of PFC control chip U1 is connected to one end of resistor R72, one end of capacitor C13, and one end of resistor R30, pin 6 is connected to PG ground, and pin 7 is connected to one end of capacitor C18, one end of resistor R32, and one end of resistor R25. Pin 8 of the PFC control chip U1 serves as a high voltage detection terminal, and pin 9 is left vacant. Pin 10 of PFC control chip U1 is connected to one end of capacitor C17 and one end of resistor R31, and pin 11 is connected to one end of resistor R89. Pin 12 of PFC control chip U1 is connected to the same end of capacitors C19 and C52 and connected to a voltage VCC1, and pin 13 is connected to one end of capacitor C12 and connected to PG ground. Pin 14 of PFC control chip U1 is connected to one end of resistor R90, pin 15 is connected to the other end of capacitor 12 and is connected to reference voltage VREF, and pin 16 is connected to the other end of capacitor C10 and the cathode of diode D6.
One input end of the transformer LF4 and one end of the capacitor C9 are used as signal receiving ends of the interleaved power factor correction circuit, and are used for receiving pulsating direct current signals. In this embodiment, the transformer LF4 includes windings T2A and T2B, wherein one end of the winding T2A is connected to one end of the winding T1A, and one end of the capacitor C9 is connected to the negative terminal of the diode D5. The other end of the capacitor C9 is connected to one end of the capacitor C10, and the connection point is connected to PG ground. The other end of the resistor R18 is connected to one end of the resistor R19, the connection point is connected to PG, and the other end of the resistor R19 is connected to the other end of the capacitor C10. The anode of the diode D6 is connected to one end of the resistor R14, and the other end of the resistor R14 is connected to the other input end of the transformer LF 4. The other end of the resistor R24 and the other end of the capacitor C13 are connected with PG ground. The other end of the resistor R30 is connected with one end of the capacitor C16, and the other end of the capacitor C16 is connected with PG ground. The other end of the resistor R72 is connected with the collector of the triode Q11, and the base of the triode Q11 is connected with one end of the capacitor C56, one end of the resistor R73 and one end of the capacitor C57.
The emitter of the transistor Q11, the other end of the capacitor C56, and the other end of the resistor R73 are connected with PG ground. The other end of the capacitor C57 is connected with one end of a resistor R74, and the other end of the resistor R74 is connected with a voltage VCC 1. The other end of the resistor R32, the other end of the capacitor C18, the other end of the capacitor C17, the other end of the capacitor C19 and the other end of the capacitor C52 are connected in parallel to PG ground. The other end of the resistor R25 is connected with one end of the resistor R23, the resistor R23 is connected with one end of the resistor R15, and the other end of the resistor R15 is connected with a voltage VBUS. The other end of the resistor R89 is connected to one end of the resistor R68, the other end of the resistor R68 is connected to the anode of the diode D8 and serves as an output driving terminal GDB, and the cathode of the diode D8 is connected to one end of the resistor R68. The other end of the resistor R90 is connected with one end of the resistor R67 and the cathode of the diode D7, and the other end of the resistor R67 and the anode of the diode D7 are connected and serve as an output driving end GDA.
One output end of the transformer LF4 is connected to the anode of the diode D3B, and the other output end is connected to PG ground. The anode of the diode D3B is connected to the drain of the field effect transistor Q2, one end of the capacitor C17, and one end of the resistors R13, R16, and R84. The source of the field effect transistor Q2, the other end of the capacitor C7, and one end of the resistor R17 are grounded. The gate of the field effect transistor Q2 is connected to the other end of the resistor R17 and to the output driver GDA. The other ends of the resistors R13, R16 and R84 are connected with one end of the capacitor C8, and the other end of the capacitor C8 is connected with a preset voltage. The anode of the capacitor C11 and the cathode of the diode D3B are connected to a predetermined voltage, and the cathode of the capacitor C11 is connected to PG ground. It should be noted here that, in the circuit diagram shown in the present embodiment, all the preset voltages adopt a voltage of + 400V.
Referring to fig. 5, the resonant conversion circuit of this embodiment includes a resonant chip U3, resistors R36, R38, R45, R51, R52, R53, R54, R55, R59, R60, R62, R63, R64, R65, R66, R82, R83, a phototransistor U6B, capacitors C27, C33, C34, C35, C36, C37, C38, C39, C42, C43, C44, C45, C46, C47, C53, C54, C89, C90, diodes D14, D20, D21, and field effect transistors Q5, Q9. In other embodiments, this resonant conversion circuit may be replaced, i.e. with other LLC resonant circuits. Adopt LLC circuit structure in this embodiment, after carrying out power conversion, resonance treatment and rectification to the signal like this, can make the circuit have zero voltage switching characteristic, can avoid switching loss to raise the efficiency and switching frequency, and then reduce magnetic element volume and filter capacitor volume, resonant inductance can utilize the leakage inductance of transformer to undertake moreover, makes cost reduction.
The resonant chip U3 of the present embodiment uses a resonant controller chip HR1001, and in other embodiments, other chips may be used instead. Pin 1 of the resonant chip U3 is connected to one end of the capacitor C36 and one end of the resistor R45, and pin 2 is connected to one end of the resistor R54 and one end of the capacitor C37. Pin 3 of the resonant chip U3 is connected to one end of a capacitor C37, and pin 4 is connected to the other end of a resistor R45, one end of a resistor R62, and one end of a resistor R55. Pin 5 of the resonant chip U3 is connected to one end of a capacitor C42 and one end of a resistor R53, and pin 6 is connected to one end of a capacitor C44 and one end of a resistor R60. The pin 7 of the resonant chip U3 is connected with one end of a resistor R65 and one end of a capacitor C45, and is also connected with the other end of a resistor R27 to receive signals of an electromagnetic filter rectifying circuit. Pin 8 of the resonant chip U3 is connected to one end of a resistor R66, one end of a capacitor C46, and the emitter of the phototransistor U6B. Pin 9 of the resonant chip U3 is connected to one end of the capacitor C34 and the cathode of the diode D14, pin 10 is connected to PG ground, and pin 11 is connected to one end of the resistor R83. A pin 12 of the resonant chip U3 is connected with a voltage VCC, a pin 13 is suspended, and a pin 14 is connected with the other end of the capacitor C34 and one end of the capacitor C27. The pin 15 of the resonant chip U3 is connected with one end of the resistor R82, and the pin 16 is connected with the other end of the capacitor C27.
The other end of the capacitor C36, the other end of the resistor R54, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the resistor R62, the other end of the capacitor C42, the other end of the capacitor C44, the other end of the resistor R65, the other end of the capacitor C45, the other end of the resistor R66, the other end of the capacitor C46, the cathode of the capacitor C54, one end of the capacitor C47, one end of the capacitor C53, one end of the resistor R63, one end of the resistor R64, and one end of the capacitor C43 are connected to PG ground. The other end of the resistor R53 is connected to the other end of the resistor R55, and to the other end of the capacitor C43. The other end of the resistor R60 is connected to one end of the capacitor C39, the other end of the resistor R63 and the other end of the resistor R64.
The collector of the phototriode U6B is connected with one end of a resistor R59, and the other end of the resistor R59 is connected with the anode of a capacitor C54, the other end of the capacitor C47 and the other end of the capacitor C53 and is connected with a voltage VCC. The anode of the diode D14, one end of the resistor R52, the source of the field-effect transistor Q9, one end of the capacitor C90, one end of the capacitor C33, and one end of the capacitor C35 are connected to PG ground. The other end of the resistor R83 is connected to the cathode of the diode D21, one end of the resistor R51, and the other end of the resistor R52. The anode of the diode D21 is connected to the other end of the resistor R51 and to the gate of the field effect transistor Q9. The drain of the field effect transistor Q9 is connected to the pin 14 of the resonant chip U3, one end of the resistor R36, the other end of the capacitor C90, one end of the capacitor C89, and the source of the field effect transistor Q5.
The other end of the resistor R82 is connected to the other end of the resistor R36, one end of the resistor R38, and the cathode of the diode D20. The anode of the diode D20 is connected with the other end of the resistor R38 and is connected with the gate of the field effect transistor Q5. The other end of the capacitor C89 is connected to the drain of the FET Q5 and is connected to a predetermined voltage. The other end of the capacitor C33 is connected to the other end of the capacitor C35 and the other end of the capacitor C39, the connection point and the other end of the capacitor C90 output a high-frequency square wave signal, and the two ends of the capacitor C43 are used for receiving the photoelectric conversion signal.
The secondary circuit comprises a high-frequency voltage transformation isolation circuit, a photoelectric isolation feedback circuit and a synchronous rectification filter circuit. After passing through the high-frequency isolation transformer, the high-frequency square wave signal is rectified and output in the synchronous rectification filter circuit, so that the function of enabling the switching power supply to output voltage or current is realized. The photoelectric isolation feedback circuit is used for sampling the output condition of the synchronous rectification filter circuit, performing photoelectric isolation on the sampling signal and enabling the resonant conversion circuit to adjust the high-frequency square wave signal according to feedback by feeding back the corresponding photoelectric conversion signal to the resonant conversion circuit.
Referring to fig. 6, in the present embodiment, the high frequency transformer isolation circuit includes an inductor L3 and a transformer LF 5. The transformer LF5 includes coils T3A, T3B, T3C, and T3D. One end of the inductor L3 is connected with one end of the coil T3A, and the other end of the inductor L3 and the other end of the coil T3A are used as input two ends of the high-frequency voltage transformation isolation circuit and used for receiving high-frequency square wave signals. The coils T3B and T3C are connected in series, and two ends and a connection point of the circuit and two ends of the coil T3D after the series connection are used as output ends of the high-frequency voltage transformation isolation circuit and output signals to the synchronous rectification filter circuit. The other end of the inductor L3 is connected with the other end of the capacitor C33, and the other end of the coil T3A is connected with the other end of the capacitor C90, so that the high-frequency square wave signal is received. The high-frequency transformation isolation circuit is isolated by the high-frequency transformer, so that the influence of a signal of a secondary circuit or a signal of a carrier on a primary circuit is prevented, and the circuit classification is realized.
Referring to fig. 7, the synchronous rectification filter circuit includes a synchronous rectification chip U4, resistors R29, R34, R35, R37, R39, R40, R41, R42, R43, R44, R46, R47, R48, R49, R50, R56, R57, R58, R61, R71, R75, R76, R77, R78, R79, R80, a slide varistor VR1, capacitors C49, C40, C41, C24, C23, C25, C58, C31, C28, C29, C30, C51, CY5, CY6, Q6, ZD 6, D6, ZD 6, LED 6, and bidirectional diode 6. Pin 1 of the synchronous rectification chip U4 is connected to one end of the resistor R46 and one end of the resistor R49, and pin 2 is grounded. Pin 3 of the synchronous rectification chip U4 is connected to one end of a resistor R80 and one end of a capacitor C49, pin 4 is connected to one end of a resistor R39, and pin 5 is grounded. Pin 6 of the synchronous rectification chip U4 is connected to one end of the resistor R40, pin 7 is connected to a voltage VEE, and pin 8 is connected to one end of the resistor R47 and one end of the resistor R50.
The other end of the resistor R46 is connected with the grid of the field effect transistor Q10, and the other end of the resistor R49 is connected with the grid of the field effect transistor Q8. The other end of the resistor R80, the other end of the capacitor C49, the source of the field-effect transistor Q8 and the source of the field-effect transistor Q10 are grounded. The drain of the field effect transistor Q8 and the drain of the field effect transistor Q10 are connected, and the connection point is used as the first input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal, namely, the end of the coil T3C is connected. The other end of the resistor R47 is connected with the grid of the field effect transistor Q6, and the other end of the resistor R50 is connected with the grid of the field effect transistor Q7. The other end of the resistor R40 is connected with the drain of the field effect transistor Q6 and the drain of the field effect transistor Q7, and the connection point is used as a second input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal, namely connected with the end part of the coil T3B.
The positive electrode of the light emitting diode LED1 is connected with the positive electrode ends of the capacitors C31, C28, C29, C51 and C30 and one end of the resistors R41, R42 and R43, and the connection point is used as the third input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal, namely is connected with the connection point of the coils T3B and T3C. The negative electrode of the light emitting diode LED1 is connected to one end of the resistor R48, and the other end of the resistor R48, the negative electrodes of the capacitors C31, C28, C29, C51 and C30, and the other ends of the resistors R41, R42 and R43 are grounded. The third input end is connected with one end of a resistor R34, and the other end of the resistor R34 is connected with one end of a resistor R71, one end of a capacitor C25, one end of a capacitor C23, one end of a resistor R35, the anode of a capacitor C24 and the cathode of a diode D11 and connected with a voltage VEE. The anode of the diode D11 is used as the fourth input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal, i.e. connected with one end of the coil T3D, while the other end of the coil T3D is grounded. The other end of the capacitor C25, the other end of the capacitor C23, the other end of the resistor R35 and the negative electrode of the capacitor C24 are grounded.
The other end of the resistor R71 is connected to one end of the resistor R76, one end of the resistor R75, the cathodes of the diodes D15, D17, D16, and D19, the anode of the capacitor C48, and one end of the resistors R77, R78, and R79, and the connection point outputs a voltage V2. The other end of the resistor R76 is connected to the cathode of the diode D12 and the anode of the capacitor C58, and outputs a voltage V3. The anode of the diode D17 is connected to the same anode of the bidirectional diodes D15 and D16, and the anode of the diode D19 is connected to the same other anode of the bidirectional diodes D15 and D16. The negative electrode of the capacitor C48 and the other ends of the resistors R77, R78 and R79 are grounded. The other end of the resistor R75 is connected with one end of the resistor R29 and one end of the resistor R37, and the other end of the resistor R29, one end of the capacitor CY5 and one end of the capacitor C32 are all connected with the input end three and output a voltage VO. The other end of the resistor R37 is connected to one end of the resistor R44, one end of the resistor R61, and one end of the capacitor C41. The other end of the resistor R61 is connected to one end of a capacitor C40, and the other end of the capacitor C41 is connected to the other end of the capacitor C40 and one end of a resistor R58. The other end of the resistor R58 is connected with one end of the resistor R57 and the anode of the diode ZD1, and the cathode of the diode ZD1 is connected with a voltage VEE.
The other end of the resistor R57 and one end of the resistor R58 output sampling signals to the photoelectric isolation feedback circuit. The other end of the capacitor C40 is connected with the cathode of the voltage stabilizing diode U7, and the anode of the voltage stabilizing diode U7 is connected with the cathode of the light emitting diode U6A and is grounded. The anode of the light emitting diode U6A is connected to one end of the resistor R56, and the other end of the resistor R56 is connected to the anode of the diode ZD 2. The cathode of the diode ZD2 is connected to one end of the capacitor CY5, and the other end of the capacitor CY5 is connected to one end of the capacitor CY6 and connected in parallel to FG ground. The other end of the capacitor CY6 is connected to the opposite end and the sliding end of the sliding varistor VR1 and grounded, and the opposite end of the sliding varistor VR1 is connected to the other end of the resistor R44. The other terminal of the capacitor C32 is connected to ground.
Referring to fig. 8, the optoelectronic isolation feedback circuit includes a light emitting diode U5A and a photodiode U5B. The light emitting diode U5A is used for sampling the output condition of the synchronous rectification filter circuit and emitting corresponding light to the photosensitive diode U5B, and the photosensitive diode U5B generates corresponding conversion signals according to the light and acts on the resonance conversion circuit. In the present embodiment, two terminals of the photodiode U5B are connected in parallel with two terminals of the capacitor C43, and the emitter is connected to PG ground. The anode of the led U5A is connected to the other end of the resistor R57, and the cathode thereof is connected to one end of the resistor R58 to receive the sampling signal. In this embodiment, the output condition is sampled by adopting the photoelectric isolation feedback circuit, and the sampling signal is fed back to the resonance conversion circuit by means of photoelectric isolation, so that closed-loop feedback can be realized while the influence of the secondary circuit on the primary circuit is avoided, thereby realizing the adjustment of the high-frequency square wave signal to avoid overload, on one hand, the output is more stable, the use safety of the switching power supply is ensured, and on the other hand, the normal use of the carrier is also ensured.
In summary, the switching power supply circuit of the present embodiment has the following advantages:
1. this switching power supply circuit, its primary circuit can filter, rectify and the conversion to external input's alternating current input, and secondary circuit can further carry out the rectification output with the signal after the conversion, utilizes the mode of optoelectronic isolation to feed back the output condition to primary circuit simultaneously to primary circuit adjusts the signal of conversion play, thereby realizes closed-loop control, realizes overload protection, and protection circuit on the one hand, on the other hand can also make output signal can be stable, avoids causing the harm to the carrier.
2. According to the switching power supply circuit, the electromagnetic filter rectification circuit of the primary circuit can filter alternating current input to inhibit common mode noise from the alternating current input, so that external electromagnetic interference introduced from an alternating current power supply line is filtered, external radiation noise of equipment per se can be avoided from interfering other electronic equipment, and normal transmission of signals is guaranteed. The staggered power factor correction circuit of the primary circuit can correct the power factor of a signal and keep the corrected boosting power stage to operate in 180-degree reverse phase, so that two boosting power stages can be staggered, the input and output inductor chain wave current can be eliminated, the boosting inductor and/or electromagnetic wave interference magnetic quantity can be reduced, the size of the boosting capacitor is reduced, and the energy efficiency is easy to realize and improve. This primary circuit's resonance converting circuit can carry out power conversion, resonance treatment and rectification to the signal of input, adopts the LLC circuit structure to have zero voltage switching characteristic moreover, can avoid switching loss to raise the efficiency and switching frequency, and then reduce magnetic element volume and filter capacitor volume, resonance inductance can utilize the leakage inductance of transformer to undertake moreover, makes cost reduction.
3. This switching power supply circuit, its secondary circuit's high frequency vary voltage buffer circuit can pass through high frequency transformer to resonant conversion circuit and keep apart, prevent that secondary circuit's signal or carrier's signal from causing the influence to primary circuit, and synchronous rectification filter circuit can rectify and export the signal through high frequency vary voltage buffer circuit, realize making switching power supply output voltage or current's function, photoelectric isolation feedback circuit can sample the output condition, the sampling signal feeds back to resonant conversion circuit through the means of photoelectric isolation, can realize closed loop feedback when avoiding secondary circuit to cause the influence to primary circuit, thereby realize the adjustment to high frequency square wave signal in order to avoid transshipping, on the one hand make the output more stable, guarantee switching power supply's security that uses, on the other hand has also guaranteed the normal use of carrier.
Example 2
Referring to fig. 9, the present embodiment provides a switching power supply circuit, which is added with an auxiliary power supply circuit based on embodiment 1. The auxiliary power supply circuit belongs to a primary circuit and comprises an auxiliary power supply chip U2 MD12H, resistors R69 and R70, capacitors C20, C21, C22 and C26, diodes D9, D10, D13, D31 and DZ1, an inductor L2 and an interface TS 1. In this embodiment, pin 1 of the auxiliary power chip U2 is connected to pin 2, and is connected to the negative terminal of the capacitor C22, one terminal of the capacitor C21, one terminal of the capacitor C20, one terminal of the inductor L2, and the negative terminals of the diodes D13 and D31. Pin 3 of the auxiliary power chip U2 is connected to the other end of the capacitor C21 and the anode of the diode DZ1, pin 4 is connected to the cathode of the diode D9 and the anode of the capacitor C22, and pin 5 is connected to pin 6, pin 7 and pin 8 and is connected to a preset voltage. The anode of the diode D9 is connected to the cathode of the diode DZ1, the other end of the capacitor C20, and the cathode of the diode D10. The other end of the inductor L2 is connected to the anode of the diode D10, the pin 2 of the interface TS1, one end of the resistor R69, one end of the resistor R70, and the anode of the capacitor C26, and outputs a voltage VCC 1. The anodes of the diodes D13 and D31, the cathode of the capacitor C26, and the other end of the resistor R70 are connected to PG ground, and the other end of the resistor R69 is connected to pin 1 of the interface TS1 and is connected to a voltage VCC. The auxiliary power circuit is capable of generating a voltage VCC1 by a preset voltage and a voltage VCC for use by other circuits.
Example 3
Referring to fig. 10, the present embodiment provides a switching power supply circuit, which is added with a lightning protection circuit based on embodiment 1. The lightning protection circuit is arranged at the front end of the electromagnetic filter rectification circuit and is used as a part of the primary circuit, the existing lightning protection unit can be adopted, only one lightning protection circuit is provided in the embodiment, and other circuit structures can be adopted in other embodiments. The lightning protection circuit comprises varistors MOV1, MOV2, MOV3 and fuse tubes F4, F5, F6 and FDG. One end of the fuse F4 is connected to pin 3 of the interface CON1, and the other end is connected to one end of the varistor MOV 3. One end of the fuse F5 is connected with one end of the fuse F4, and the other end is connected with one end of the varistor MOV 1. The other end of the MOV1 is connected to one end of the FDG and to one end of the varistor MOV 2. The other end of the piezoresistor MOV2 is connected with one end of a fuse F6, and the other end of the fuse F6 is connected with the other end of the piezoresistor MOV 3. One end of the fuse tube F1 is directly connected to the other end of the fuse tube F4, and the connection with the previous interface CON1 is disconnected. One end of the fuse F3 is directly connected to the other end of the fuse F6, and is disconnected from the previous interface CON 1.
When a lightning stroke occurs, high voltage formed by the lightning stroke enters a power supply, and the power supply is powered by MOV1, MOV2, MOV 3: and a circuit consisting of F4, F5, F6 and FDG is protected. When the voltage applied to the two ends of the voltage dependent resistor exceeds the working voltage, the resistance value is reduced, high energy is consumed on the voltage dependent resistor, and if the current is too large, the protective tubes F4, F5 and F6 can be burnt to protect the rear-stage circuit.
Example 4
This embodiment provides a switching power supply including any one of the switching power supply circuits provided in embodiments 1 to 3, and of course, in practical use, may further include a housing. The switch power supply circuit is welded on the circuit board, the circuit board is arranged in the shell, and each interface is directly arranged on a notch arranged on the shell.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A switching power supply circuit characterized by comprising:
a primary circuit for filtering, correcting and converting an externally input ac input to generate a high frequency square wave signal; the primary circuit comprises an electromagnetic filter rectifying circuit, an interleaved power factor correction circuit and a resonance conversion circuit; the electromagnetic filter rectifying circuit is used for filtering the alternating current input to inhibit common mode noise from the alternating current input and generating a pulsating direct current signal which is transmitted to the interleaved power factor correction circuit; the interleaved power factor correction circuit is used for performing power factor correction on the pulsating direct current signal, keeping 180-degree reverse phase operation and converting the pulsating direct current signal into a direct current level; the resonance conversion circuit performs high-frequency switching on the direct current level, so that the direct current level is converted into a high-frequency square wave signal, and the high-frequency square wave signal is coupled to a secondary side through a high-frequency isolation transformer. The protection circuit is responsible for detecting primary voltage and current signals and protects the primary circuit in time when abnormality occurs.
The secondary circuit is used for rectifying and outputting the high-frequency square wave signal and feeding back the rectified direct current output to the resonance conversion circuit; the secondary circuit comprises a photoelectric isolation feedback circuit and a synchronous rectification filter circuit; after the high-frequency square wave signal is coupled through the high-frequency isolation transformer, rectifying and filtering output are carried out in the synchronous rectifying and filtering circuit; the photoelectric isolation feedback circuit is used for sampling the direct current output of the synchronous rectification filter circuit and enabling the resonant conversion circuit to adjust the high-frequency square wave signal according to feedback by feeding back a corresponding photoelectric conversion signal to the resonant conversion circuit.
2. The switching power supply circuit according to claim 1, wherein the electromagnetic interference filter circuit comprises a fuse F, a zener diode Z, a switch K, a resistor R, RS, a thermistor NTC, a capacitor C, CY, a transformer LF, a rectifier bridge BD, a diode D, D3, D, a FET Q, an interface CON, CON;
pin 1 of the interface CON1 is connected to FG ground, pin 2 is connected to the zero line signal of the ac input, and pin 3 is connected to the live line signal of the ac input; one end of the fuse tube F1 is connected with pin 3 of the interface CON 1; one end of the protective tube F3 is connected with a pin 2 of the interface CON1, and the other end is connected with one end of the thermistor NTC 1; the voltage stabilizing diode Z1 and the capacitor C4 are connected in parallel, one end of the parallel connection is connected with the other end of the fuse F1, and the other end of the parallel connection is connected with the other end of the thermistor NTC 1; pin 1 of the switch K1 is connected with PG ground, pin 2 is connected with one end of a resistor R33, pin 4 is connected with one end of NTC1, and pin 3 is connected with the other end of NTC 1; one end of the resistor R33 is also connected with the cathode of the diode D1, and the other end is connected with a voltage VCC 1; the anode of the capacitor C55 is connected with the voltage VCC1, and the cathode is connected with PG ground; the anode of the diode D1 is connected with PG ground; one end of the resistor R1 is connected with one end of the resistor R6, and the other end of the resistor R1 is connected with the other end of the fuse F1; the other end of the resistor R6 is connected with one end of a resistor R87 and a pin 3 of a switch K1; the other end of the resistor R87 is connected with one end of the resistor R86, and the other end of the resistor R86 is connected with the other end of the resistor R1; the input two ends of the transformer LF1 are respectively connected with one end of a resistor R87 and the other end of a resistor R86, and the output two ends are respectively connected with the same ends of a capacitor CY1 and a capacitor CY 2; the other ends of the capacitor CY1 and the capacitor CY2 are connected, and the connection point is connected with FG ground; the input two ends of the transformer LF2 are respectively connected with the same ends of the capacitor CY1 and the capacitor CY2, and the output two ends of the transformer LF2 are respectively connected with the input two ends of the rectifier bridge BD 1; one output end of the rectifier bridge BD1 is connected with one input end of the transformer LF3, and the other output end of the rectifier bridge BD1 is used as a current detection end and connected with the cathode of the diode D4; one end of the capacitor C3 is connected with one output end of the rectifier bridge BD1 and is connected with a voltage VBUS, and the other end of the capacitor C3 is connected with the current detection end; the resistor RS1, the resistor RS2 and the diode D4 are connected in parallel, and the anode of the diode D4 is connected with one output end of the transformer LF 3; the other input end of the transformer LF3 is connected with one end of a resistor R3, and the other end of the resistor R3 is connected with the anode of a diode D5; the other output end of the transformer LF3 is connected with the drain electrode of the field effect transistor Q1; the grid of the field effect transistor Q1 is connected with one end of the resistor R9 and connected with the output driving end GDB generated by the staggered power factor correction circuit, and the other end of the resistor R9 is connected with the anode of the diode D4; the source electrode of the field effect transistor Q1 is connected with the other end of the resistor R9 and is connected with one end of the capacitor C1; the other end of the capacitor C1 is connected with the anode of the diode D3A and the drain of the field effect transistor Q1; the resistors R2, R7 and R85 are connected in parallel, one end of the parallel connected resistors is connected with the anode of the diode D3A, and the other end of the parallel connected resistors is connected with one end of the capacitor C2; the other end of the capacitor C2 is connected with the positive electrode of the capacitor C6, and the negative electrodes of the capacitors C5 and C6 are connected with PG ground; the anode of the capacitor C5 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected with the voltage VBUS; one end of the resistor R4 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R11; the other end of the resistor R11 is connected with one end of the resistor R21, and the other end of the resistor R21 is connected with one end of the resistor R28; resistor 28 is connected in parallel with capacitor C14, and the other terminal is PG ground; one end of the resistor R5 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R10; the other end of the resistor R10 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with one end of the resistor R26; the resistor 26 is connected with the capacitor C15 in parallel, and the other end of the resistor is connected with PG ground; one end of the resistor R8 is connected with the cathode of the diode D2, and the other end is connected with one end of the resistor R20; the other end of the resistor R20 is connected with one end of a resistor R27; one end of the fuse F2 is connected to the cathode of the diode D2, and the other end is connected to pin 1 of the interface CON 5; one end of the capacitor C50 is connected with the cathode of the diode D2, and the other end is connected with the anode of the diode D18; the cathode of the diode D18 is connected with one end of the capacitor C59 and is connected with a preset voltage; pin 2 of the interface CON5 and the other end of the capacitor C59 are connected to PG ground, and the cathode of the diode D2 is connected to the preset voltage;
the FG ground and the PG ground are connected through a capacitor CY 3; the cathode of the diode D5 and one input end of the transformer LF3 output the pulsating direct current signal, and the other end of the resistor R27 outputs the interleaved control signal.
3. The switching power supply circuit according to claim 1, wherein the interleaved power factor correction circuit comprises a PFC control chip U1, resistors R13, R14, R15, R16, R17, R18, R19, R23, R24, R25, R29, capacitors C29, diodes D29, D3 29, a transformer LF 72, a triode Q29, and a field effect transistor Q29;
the PFC control chip U1 is an interactive PFC chip UCC 280611; pin 1 of PFC control chip U1 is connected to one end of resistor R18 and one end of capacitor C9, pin 2 is used as a voltage detection terminal, pin 3 is connected to one end of resistor R24, pin 4 is connected to a reference voltage VREF, pin 5 is connected to one end of resistor R72, one end of capacitor C13 and one end of resistor R30, pin 6 is connected to PG ground, pin 7 is connected to one end of capacitor C18, one end of resistor R32 and one end of resistor R25, pin 8 is used as a high voltage detection terminal, pin 9 is left empty, pin 10 is connected to one end of capacitor C17 and one end of resistor R31, pin 11 is connected to one end of resistor R89, pin 12 is connected to the same end of capacitors C19 and C52 and connected to a voltage VCC1, pin 13 is connected to one end of capacitor C12 and connected to PG ground, pin 14 is connected to one end of resistor R90, pin 15 is connected to the other end of capacitor 12 and connected to VREF, pin 16 is connected to the other end of capacitor C10 and connected to the reference voltage VREF, The cathode of the diode D6 is connected;
one input end of the transformer LF4 and one end of the capacitor C9 are used as signal receiving ends of the interleaved power factor correction circuit and are used for receiving the pulsating direct current signal; the other end of the capacitor C9 is connected with one end of the capacitor C10, and the connection point is connected with PG ground; the other end of the resistor R18 is connected with one end of the resistor R19, the connection point is connected with PG ground, and the other end of the resistor R19 is connected with the other end of the capacitor C10; the anode of the diode D6 is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the other input end of the transformer LF 4; the other end of the resistor R24 and the other end of the capacitor C13 are connected with PG ground; the other end of the resistor R30 is connected with one end of the capacitor C16, and the other end of the capacitor C16 is connected with PG ground; the other end of the resistor R72 is connected with the collector of the triode Q11, and the base of the triode Q11 is connected with one end of the capacitor C56, one end of the resistor R73 and one end of the capacitor C57; the emitter of the triode Q11, the other end of the capacitor C56 and the other end of the resistor R73 are connected with PG ground; the other end of the capacitor C57 is connected with one end of a resistor R74, and the other end of the resistor R74 is connected with a voltage VCC 1; the other end of the resistor R32, the other end of the capacitor C18, the other end of the capacitor C17, the other end of the capacitor C19 and the other end of the capacitor C52 are connected in parallel with PG ground; the other end of the resistor R25 is connected with one end of the resistor R23, the resistor R23 is connected with one end of the resistor R15, and the other end of the resistor R15 is connected with a voltage VBUS; the other end of the resistor R89 is connected with one end of the resistor R68, the other end of the resistor R68 is connected with the anode of the diode D8 and serves as an output driving end GDB, and the cathode of the diode D8 is connected with one end of the resistor R68; the other end of the resistor R90 is connected with one end of the resistor R67 and the cathode of the diode D7, and the other end of the resistor R67 and the anode of the diode D7 are connected and serve as an output driving end GDA; one output end of the transformer LF4 is connected with the anode of the diode D3B, and the other output end is connected with PG ground; the anode of the diode D3B is connected with the drain of the field effect transistor Q2, one end of the capacitor C17 and one end of the resistors R13, R16 and R84; the source electrode of the field effect transistor Q2, the other end of the capacitor C7 and one end of the resistor R17 are grounded; the grid of the field effect transistor Q2 is connected with the other end of the resistor R17 and connected with the output driving end GDA; the other ends of the resistors R13, R16 and R84 are connected with one end of a capacitor C8, and the other end of the capacitor C8 is connected with a preset voltage; the anode of the capacitor C11 and the cathode of the diode D3B are connected to the preset voltage, and the cathode of the capacitor C11 is connected to PG ground.
4. The switching power supply circuit according to claim 1, wherein the resonance converting circuit includes a resonance chip U3, resistors R36, R38, R45, R51, R52, R53, R54, R55, R59, R60, R62, R63, R64, R65, R66, R82, R83, a phototransistor U6B, capacitors C27, C33, C34, C35, C36, C37, C38, C39, C42, C43, C44, C45, C46, C47, C53, C54, C89, C90, diodes D14, D20, D21, a field effect transistor Q5, Q9;
the resonance chip U3 adopts a resonance controller chip HR 1001; pin 1 of resonant chip U3 is connected to one end of capacitor C36 and one end of resistor R45, pin 2 is connected to one end of resistor R54 and one end of capacitor C37, pin 3 is connected to one end of capacitor C37, pin 4 is connected to the other end of resistor R45, one end of resistor R62 and one end of resistor R55, pin 5 is connected to one end of capacitor C42 and one end of resistor R53, pin 6 is connected to one end of capacitor C44 and one end of resistor R60, pin 7 is connected to one end of resistor R65 and one end of capacitor C45, pin 8 is connected to one end of resistor R66, one end of capacitor C46 and the emitter of photo transistor U6B, pin 9 is connected to one end of capacitor C34 and the cathode of diode D14, pin 10 is connected to PG ground, pin 11 is connected to one end of resistor R83, pin 12 is connected to a voltage, pin 13, pin 14 is connected to one end of capacitor C34 and one end of capacitor C27, pin 15 is connected with one end of resistor R82, and pin 16 is connected with the other end of capacitor C27;
the other end of the capacitor C36, the other end of the resistor R54, the other end of the capacitor C37, the other end of the capacitor C38, the other end of the resistor R62, the other end of the capacitor C42, the other end of the capacitor C44, the other end of the resistor R65, the other end of the capacitor C45, the other end of the resistor R66, the other end of the capacitor C46, the cathode of the capacitor C54, one end of the capacitor C47, one end of the capacitor C53, one end of the resistor R63, one end of the resistor R64, and one end of the capacitor C43 are connected to PG ground; the other end of the resistor R53 and the other end of the resistor R55 are connected, and are connected with the other end of the capacitor C43; the other end of the resistor R60 is connected with one end of the capacitor C39, the other end of the resistor R63 and the other end of the resistor R64; the collector of the phototriode U6B is connected with one end of a resistor R59, and the other end of the resistor R59 is connected with the anode of a capacitor C54, the other end of the capacitor C47 and the other end of a capacitor C53 and is connected with a voltage VCC; the positive electrode of the diode D14, one end of the resistor R52, the source of the field effect transistor Q9, one end of the capacitor C90, one end of the capacitor C33 and one end of the capacitor C35 are connected with PG ground; the other end of the resistor R83 is connected with the cathode of the diode D21, one end of the resistor R51 and the other end of the resistor R52; the anode of the diode D21 is connected with the other end of the resistor R51 and is connected with the gate of the field effect transistor Q9; the drain of the field effect transistor Q9 is connected with the pin 14 of the resonant chip U3, one end of the resistor R36, the other end of the capacitor C90, one end of the capacitor C89 and the source of the field effect transistor Q5; the other end of the resistor R82 is connected with the other end of the resistor R36, one end of the resistor R38 and the cathode of the diode D20; the anode of the diode D20 is connected with the other end of the resistor R38 and is connected with the gate of the field effect transistor Q5; the other end of the capacitor C89 is connected with the drain electrode of the field effect transistor Q5 and is connected with a preset voltage;
the other end of the capacitor C33 is connected to the other end of the capacitor C35 and the other end of the capacitor C39, the connection point and the other end of the capacitor C90 output the high-frequency square wave signal, and the two ends of the capacitor C43 are used for receiving the photoelectric conversion signal.
5. The switching power supply circuit according to claim 1, wherein the synchronous rectification filter circuit includes a synchronous rectification chip U4MP6924A, resistors R29, R34, R35, R37, R39, R40, R41, R42, R43, R44, R46, R47, R48, R49, R50, R56, R57, R58, R61, R71, R75, R76, R77, R78, R79, R80, a slide rheostat VR1, capacitors C49, C40, C41, C24, C23, C25, C58, C31, C28, C867, C30, C36 29 2, CY 51, Q51, ZD 51, LED 51, ZD 51, LED 51, ZD 51, and LED 51;
pin 1 of the synchronous rectification chip U4 is connected with one end of a resistor R46 and one end of a resistor R49, pin 2 is grounded, pin 3 is connected with one end of a resistor R80 and one end of a capacitor C49, pin 4 is connected with one end of a resistor R39, pin 5 is grounded, pin 6 is connected with one end of a resistor R40, pin 7 is connected with a voltage VEE, and pin 8 is connected with one end of a resistor R47 and one end of a resistor R50;
the other end of the resistor R46 is connected with the grid of the field effect transistor Q10, and the other end of the resistor R49 is connected with the grid of the field effect transistor Q8; the other end of the resistor R80, the other end of the capacitor C49, the source electrode of the field-effect transistor Q8 and the source electrode of the field-effect transistor Q10 are grounded; the drain electrode of the field effect transistor Q8 and the drain electrode of the field effect transistor Q10 are connected, and the connection point is used as the first input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the other end of the resistor R47 is connected with the grid of the field effect transistor Q6, and the other end of the resistor R50 is connected with the grid of the field effect transistor Q7; the other end of the resistor R40 is connected with the drain electrode of the field effect transistor Q6 and the drain electrode of the field effect transistor Q7, and the connection point is used as a second input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the anode of the light emitting diode LED1 is connected with the anode ends of the capacitors C31, C28, C29, C51 and C30 and one ends of the resistors R41, R42 and R43, and the connection point is used as the third input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the negative electrode of the light emitting diode LED1 is connected with one end of a resistor R48, the other end of the resistor R48, the negative electrodes of capacitors C31, C28, C29, C51 and C30 and the other ends of the resistors R41, R42 and R43 are grounded; the third input end is connected with one end of a resistor R34, the other end of the resistor R34 is connected with one end of a resistor R71, one end of a capacitor C25, one end of a capacitor C23, one end of a resistor R35, the anode of a capacitor C24 and the cathode of a diode D11, and a voltage VEE is connected in; the anode of the diode D11 is used as the fourth input end of the synchronous rectification filter circuit for receiving the high-frequency square wave signal; the other end of the capacitor C25, the other end of the capacitor C23, the other end of the resistor R35 and the negative electrode of the capacitor C24 are grounded; the other end of the resistor R71 is connected with one end of a resistor R76, one end of a resistor R75, the cathodes of diodes D15, D17, D16 and D19, the anode of a capacitor C48 and one end of resistors R77, R78 and R79, and a voltage V2 is output from the connection point; the other end of the resistor R76 is connected with the cathode of the diode D12 and the anode of the capacitor C58, and outputs a voltage V3; the anode of the diode D17 is connected with the same anode of the bidirectional diode D15 and D16, and the anode of the diode D19 is connected with the same other anode of the bidirectional diode D15 and D16; the negative electrode of the capacitor C48 and the other ends of the resistors R77, R78 and R79 are grounded; the other end of the resistor R75 is connected with one end of the resistor R29 and one end of the resistor R37, and the other end of the resistor R29, one end of the capacitor CY5 and one end of the capacitor C32 are all connected with the input end three and output a voltage VO; the other end of the resistor R37 is connected with one end of a resistor R44, one end of a resistor R61 and one end of a capacitor C41; the other end of the resistor R61 is connected with one end of a capacitor C40, and the other end of the capacitor C41 is connected with the other end of the capacitor C40 and one end of a resistor R58; the other end of the resistor R58 is connected with one end of the resistor R57 and the anode of the diode ZD1, and the cathode of the diode ZD1 is connected with a voltage VEE; the other end of the resistor R57 and one end of the resistor R58 output the sampling signal to the photoelectric isolation feedback circuit; the other end of the capacitor C40 is connected with the cathode of the voltage stabilizing diode U7, and the anode of the voltage stabilizing diode U7 is connected with the cathode of the light emitting diode U6A and is grounded; the anode of the light emitting diode U6A is connected with one end of a resistor R56, and the other end of the resistor R56 is connected with the anode of a diode ZD 2; the cathode of the diode ZD2 is connected with one end of a capacitor CY5, and the other end of the capacitor CY5 is connected with one end of a capacitor CY6 and connected in parallel with FG ground; the other end of the capacitor CY6 is connected with the opposite end and the sliding end of the sliding rheostat VR1 and grounded, and the opposite end of the sliding rheostat VR1 is connected with the other end of the resistor R44; the other terminal of the capacitor C32 is connected to ground.
6. The switching power supply circuit according to claim 1, wherein the high frequency transformer isolation circuit includes an inductor L3 and a transformer LF 5; the transformer LF5 includes coils T3A, T3B, T3C and T3D; one end of an inductor L3 is connected with one end of a coil T3A, and the other end of an inductor L3 and the other end of the coil T3A are used as the input two ends of the high-frequency voltage transformation isolation circuit and are used for receiving the high-frequency square wave signal; the coils T3B and T3C are connected in series, and two ends and a connection point of the circuit after the coils are connected in series and two ends of the coil T3D are used as output ends of the high-frequency voltage transformation isolation circuit and output signals to the synchronous rectification filter circuit.
7. The switching power supply circuit according to claim 1 wherein said opto-electrically isolated feedback circuit comprises a light emitting diode U5A and a light sensitive diode U5B; the light emitting diode U5A is used for sampling the output condition of the synchronous rectification filter circuit and emitting corresponding light to the photosensitive diode U5B, and the photosensitive diode U5B generates corresponding conversion signals according to the light and acts on the resonance conversion circuit.
8. The switching power supply circuit according to claim 1, wherein the primary circuit further includes an auxiliary power supply circuit; the auxiliary power supply circuit comprises an auxiliary power supply chip U2 MD12H, resistors R69 and R70, capacitors C20, C21, C22 and C26, diodes D9, D10, D13, D31 and DZ1, an inductor L2 and an interface TS 1;
pin 1 and pin 2 of the auxiliary power chip U2 are connected and connected with the cathode of the capacitor C22, one end of the capacitor C21, one end of the capacitor C20, one end of the inductor L2 and the cathodes of the diodes D13 and D31; a pin 3 of the auxiliary power chip U2 is connected with the other end of the capacitor C21 and the anode of the diode DZ1, a pin 4 is connected with the cathode of the diode D9 and the anode of the capacitor C22, and a pin 5 is connected with a pin 6, a pin 7 and a pin 8 and is connected with a preset voltage; the anode of the diode D9 is connected with the cathode of the diode DZ1, the other end of the capacitor C20 and the cathode of the diode D10; the other end of the inductor L2 is connected with the anode of the diode D10, the pin 2 of the interface TS1, one end of the resistor R69, one end of the resistor R70 and the anode of the capacitor C26, and outputs a voltage VCC 1; the anodes of the diodes D13 and D31, the cathode of the capacitor C26, and the other end of the resistor R70 are connected to PG ground, and the other end of the resistor R69 is connected to pin 1 of the interface TS1 and is connected to a voltage VCC.
9. The switching power supply circuit according to claim 5, wherein said synchronous rectification filter circuit further comprises interfaces VO +, VO-, CN2, CN3, CON 4; the interface VO + is provided with four pins which are mutually connected and used for outputting voltage VO; the interface VO-is provided with four pins which are connected with each other and is connected with the other end of the capacitor C32; interface CN2 has two pins, pin 1 for outputting voltage V3, and pin 2 connected to ground; the interface CN3 has two pins, pin 1 is grounded, pin 2 is connected to the other end of the capacitor CY7 and outputs a voltage V2; the interface CON4 has five pins, pin 1 for outputting the voltage V2, pin 2 connected to pin 3 and connected to the other end of the capacitor C32, and pin 4 connected to pin 5 and connected to one end of the capacitor C32.
10. A switching power supply, characterized in that it comprises a switching power supply circuit according to any one of claims 1-9.
CN201911056794.2A 2019-10-31 2019-10-31 Switching power supply circuit and switching power supply thereof Pending CN110752760A (en)

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CN201533443U (en) * 2009-11-03 2010-07-21 孝感市惠维照明电器有限责任公司 Digital-type high-power multifunctional HID electronic ballast
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Application publication date: 20200204