CN111740618A - PC power supply circuit - Google Patents

PC power supply circuit Download PDF

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Publication number
CN111740618A
CN111740618A CN202010443701.8A CN202010443701A CN111740618A CN 111740618 A CN111740618 A CN 111740618A CN 202010443701 A CN202010443701 A CN 202010443701A CN 111740618 A CN111740618 A CN 111740618A
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CN
China
Prior art keywords
resistor
capacitor
circuit
diode
tube
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Pending
Application number
CN202010443701.8A
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Chinese (zh)
Inventor
宋旭东
许文才
张魁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Sohoo Technology Co ltd
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Guangdong Sohoo Technology Co ltd
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Priority to CN202010443701.8A priority Critical patent/CN111740618A/en
Publication of CN111740618A publication Critical patent/CN111740618A/en
Pending legal-status Critical Current

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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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • 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
    • 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

Abstract

The invention relates to the technical field of computer power control, in particular to a PC power circuit which comprises a standby circuit, a PFC circuit, a voltage stabilizing circuit, a PWM (pulse width modulation) driving circuit, a first synchronous rectification circuit, a second synchronous rectification circuit and a monitoring circuit, wherein the standby circuit is respectively and electrically connected with the voltage stabilizing circuit, the PFC circuit, the PWM driving circuit and the monitoring circuit, the PWM driving circuit is electrically connected with the first synchronous rectification circuit, and the first synchronous rectification circuit is electrically connected with the second synchronous rectification circuit. The invention has novel structure and ingenious design, realizes the output of various voltages, supplies power to the PC power supply and effectively improves the conversion efficiency.

Description

PC power supply circuit
Technical Field
The invention relates to the technical field of computer power control, in particular to a PC power circuit.
Background
PC power supplies are devices that convert ac power to dc power and provide power to host accessories. There is a loss in this energy conversion process, and one index for measuring the loss is the conversion efficiency. The conversion efficiency is the ratio of the output power of the power supply to the input power, or specifically, the ratio of the sum of the dc output powers of the groups to the input active power. Ideally, the power supply can convert all ac energy into dc output without dissipation, however, in practice, the switching power supply still has considerable loss, and thus the conversion efficiency becomes an important index for measuring the performance of the switching power supply. Therefore, it is necessary to improve the conversion efficiency of the power supply.
Disclosure of Invention
The PC power supply circuit is novel in structure and ingenious in design, various voltages are output, power is supplied to the PC power supply, and conversion efficiency is effectively improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a PC power supply circuit which comprises a standby circuit, a PFC circuit, a voltage stabilizing circuit, a PWM driving circuit, a first synchronous rectification circuit, a second synchronous rectification circuit and a monitoring circuit, wherein the standby circuit is respectively and electrically connected with the voltage stabilizing circuit, the PFC circuit, the PWM driving circuit and the monitoring circuit, the PWM driving circuit is electrically connected with the first synchronous rectification circuit, and the first synchronous rectification circuit is electrically connected with the second synchronous rectification circuit.
Wherein the standby circuit comprises a power management chip U3 and a winding T3.
The PFC circuit comprises a rectifier bridge BD1, an inductance coil L1, a thermistor TH1, a diode D11, a diode D21, a resistor R7, a resistor R11, a MOS tube Q1, a switch tube Q8, a switch tube Q9, a resistor R25, a resistor R28, a resistor R32, a capacitor C2, a resistor R15, a resistor R18, a capacitor C3 and a capacitor C4, wherein the rectifier bridge BD1 is connected with one end of the capacitor C3, one end of the resistor R7, an anode of the diode D21 and one end of the inductance coil L1, the other end of the inductance coil L1 is connected with an anode of the diode D11, a cathode of the diode D11 and a cathode of the diode D21 are both connected with one end of the thermistor TH1, and the other end of the thermistor TH1 is respectively connected with a standby circuit and a capacitor C2; the other end of the resistor R7 is connected with one end of the resistor R11, and the other end of the resistor R11 is grounded; the base electrode of the switching tube Q8 and the base electrode of the switching tube Q9 are both connected with one end of a resistor R25, the collector electrode of the switching tube Q8 is connected with a voltage stabilizing circuit and one end of a capacitor C4, the emitter electrode of the switching tube Q8 is respectively connected with one end of a resistor R28 and the emitter electrode of the switching tube Q9, the other end of the resistor R28 is respectively connected with one end of a resistor R32 and the gate electrode of the MOS tube Q1, and the other end of the resistor R32 is respectively connected with the source electrode of the MOS tube Q1, the other end of the capacitor C4 and the collector electrode of the switching tube Q9.
The PWM driving circuit comprises a PWM controller U2, a switching tube Q4, a switching tube Q5, a resistor R33, a resistor R36, a resistor R37, a resistor R38, a capacitor C20, a capacitor C21, a MOS tube Q2, a MOS tube Q3, a diode D3, a winding T2, a capacitor C14, a diode D6, a resistor R17, a resistor R16 and a winding T1; the PWM controller U2 is connected to the base of a switching tube Q4 and the base of a switching tube Q5, the collector of the switching tube Q4 is connected to a voltage stabilizing circuit, the emitter of the switching tube Q4 is connected to the emitter of the switching tube Q5, the emitters of the switching tube Q4 and the switching tube Q5 are connected to one end of a resistor R37 and one end of a capacitor C21, the other end of the resistor R37 is connected to a resistor R38 and the gate of a MOS tube Q3, the source of the MOS tube Q3, the other end of the resistor R38 and one end of the resistor R36 are connected to one end of a resistor R33, the other end of the resistor R36 is connected to one end of a capacitor C20, the other end of the capacitor C20 is connected to the other end of the resistor R33 and then connected to the PWM controller U2, the other end of the capacitor C21 is connected to the primary side of a winding T2, the drain of the MOS tube Q3 is connected to the anode of a diode D3 and the primary side of the winding 1, the cathode of the diode D3 is connected with the FPC circuit, the secondary side of the winding T2 is connected with one end of a capacitor C14, the primary side of the winding T1, one end of a resistor R17, the cathode of the diode D6 and the source of a MOS tube Q2, the source of the MOS tube Q2 is connected with the primary side of the winding T1, the other end of the capacitor C14 is connected with one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R17 are connected with the gate of the MOS tube Q2, and the drain of the MOS tube Q2 is connected with the FPC circuit.
The first synchronous rectification circuit comprises an MOS transistor Q11, an MOS transistor Q12, a capacitor C26, a resistor R39, a capacitor C11, a resistor R19, a capacitor C13, a resistor R21, an inductor L71, an inductor L72, a diode D5, a capacitor C16, a capacitor C5, an inductor L7, an inductor L5 and a capacitor C12; the gate of the MOS transistor Q11, the gate of the MOS transistor Q12, one end of the capacitor C26, the drain of the MOS transistor Q12, the drain of the MOS transistor Q11, one end of the capacitor C13, and one end of the inductor L71 are all connected to the PWM driving circuit, the other end of the capacitor C26 is connected to one end of a resistor R39, the other end of the resistor R39 and the source of the MOS transistor Q12 are both connected to the source of the MOS transistor Q11, the source of the MOS transistor Q11 is connected to one end of a capacitor C11 and the cathode of a diode D5, the other end of the capacitor C11 is connected to one end of a resistor R11, the other end of the resistor R11 is connected to the anode of the diode D11 and one end of an inductor L11, the cathode of the diode D11 is connected to one end of the resistor R11, the other end of the inductor L11 is connected to one end of the inductor L11, the other end of the inductor L5 is connected with a second synchronous rectification circuit, the other end of the capacitor C16 is connected with one end of a capacitor C5 and the cathode of a diode D5, the other end of the capacitor C5 is connected with the other end of the inductor L72, the other end of the inductor L7 is connected with one end of a capacitor C12, and the common end of the capacitor C12, the capacitor C16 and the capacitor C5 is grounded.
The voltage stabilizing circuit comprises a capacitor C47, a resistor R303, a switching tube Q7, a voltage stabilizing diode ZD1, a capacitor C19 and a capacitor C39, wherein a collector of the switching tube Q7 is respectively connected with one end of the resistor R303, one end of the capacitor C47 and a standby circuit, a base of the switching tube Q7 is connected with a cathode of the voltage stabilizing diode ZD1, an anode of the voltage stabilizing diode ZD1 is grounded, the capacitor C19 is connected with the voltage stabilizing diode ZD1 in parallel, one end of the capacitor C39 is connected with an emitter of the switching tube Q7, and the other end of the capacitor C39 is grounded.
Wherein the second synchronous rectification circuit comprises an integrated IC chip U8, a switching tube Q501, a switching tube Q502, an inductor L4, a diode D501, a switching tube Q601, a switching tube Q602, an inductor L3, a diode D601, a resistor R505, a capacitor C501, a resistor R610, a resistor R607, a resistor R605 and a capacitor C601, the UGATE1 pin and the PHASE1 pin of the integrated IC chip U8 are both connected with the gate of the switching tube Q501, the drain of the switching tube Q501 is connected with one end of the resistor R505, the other end of the resistor R505 is connected with the OCSET1 pin of the integrated IC chip U8, the source of the switching tube Q501 and the drain of the switching tube Q502 are both connected with one end of the inductor L4, the other end of the inductor L4 is connected with one end of the resistor R510, the other end of the resistor R510 is connected with one end of the resistor R507, the other end of the resistor R507 is grounded, the capacitor C501 is connected with the resistor R505 in parallel, the source of the switch tube Q502 is grounded, and the gate of the switch tube Q502 is connected with the LGATE1 pin of the integrated IC chip U8; the UGATE2 pin and the PHASE2 pin of the integrated IC chip U8 are both connected with the gate of a switch tube Q601, the LGATE2 pin of the integrated IC chip U8 is connected with the gate of a switch tube Q602, the drain of the switch tube Q601 is connected with one end of a resistor R605, the other end of the resistor R065 is connected with the OCSTATE 2 pin of the integrated IC chip U8, the capacitor C601 is connected with the resistor R605 in parallel, the source of the switch tube Q601 and the drain of the switch tube Q602 are both connected with one end of an inductance coil L3, the other end of the inductance coil L3 is connected with one end of a resistor R610, the other end of the resistor R610 is connected with one end of a resistor R607, the other end of the resistor R607 is grounded, the source of the switch tube Q602 is grounded, and one end of the resistor R605 is connected with the first synchronous rectification circuit.
The monitoring circuit comprises a power management chip U6, and the model of the power management chip U6 is GR 8313.
The invention has the beneficial effects that:
the invention has novel structure and ingenious design, realizes the output of various voltages, supplies power to the PC power supply and effectively improves the conversion efficiency.
Drawings
FIG. 1 is a schematic diagram of a PC power circuit according to the present invention.
Fig. 2 is a schematic structural diagram of a standby circuit according to the present invention.
Fig. 3 is a schematic structural diagram of the PFC circuit according to the present invention.
FIG. 4 is a schematic diagram of a voltage regulator circuit according to the present invention.
Fig. 5 is a schematic structural diagram of a PWM driving circuit according to the present invention.
Fig. 6 is a schematic diagram of a first synchronous rectification circuit according to the present invention.
Fig. 7 is a schematic structural diagram of a monitoring circuit according to the present invention.
FIG. 8 is a schematic diagram of a second synchronous rectification circuit according to the present invention.
The reference numerals in fig. 1 to 8 include:
1-standby circuit 2-PFC circuit 3-voltage stabilizing circuit
4-PWM driving circuit 5-first synchronous rectification circuit 6-monitoring circuit
7-second synchronous rectification circuit.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
A PC power circuit is shown in figures 1 to 8 and comprises a standby circuit 1, a PFC circuit 2, a voltage stabilizing circuit 3, a PWM driving circuit 4, a first synchronous rectification circuit 5, a second synchronous rectification circuit 7 and a monitoring circuit 6, wherein the standby circuit 1 is respectively electrically connected with the voltage stabilizing circuit 3, the PFC circuit 2, the PWM driving circuit 4 and the monitoring circuit 6, the PWM driving circuit 4 is electrically connected with the first synchronous rectification circuit 5, and the first synchronous rectification circuit 5 is electrically connected with the second synchronous rectification circuit 7. Specifically, the embodiment of the invention has a novel structure and an ingenious design, the PFC circuit 2 increases the power factor, transmits the voltage to the standby circuit 1, the 380V voltage processed by the PFC circuit 2 is used as a primary side energy source of the standby circuit 1, then the standby circuit 1 rectifies the voltage by the standby circuit 1 and then outputs a voltage value to the voltage stabilizing circuit 3, the voltage stabilizing circuit 3 stabilizes the voltage output by the standby circuit 1, the monitoring circuit 6 is connected with the voltage stabilizing circuit 3, the PWM driving circuit 4 and the second synchronous rectification circuit 7, the PWM driving circuit 4 is connected with the PFC circuit 2, the PWM driving circuit 4 sends out a PWN in signal and transmits the PWN in signal to the first synchronous rectification circuit 5, the first synchronous rectification circuit 5 rectifies the voltage and outputs 12V and-12V voltage, the second synchronous rectification circuit 7 rectifies the voltage and outputs 5V and 3.3V voltage, the monitoring circuit 6 monitors each circuit of the embodiment of the invention, the protective function can be achieved; the embodiment of the invention realizes the output of various voltages and the power supply of the PC power supply, effectively improves the conversion efficiency, can save energy and save the electric charge for users.
In the PC power circuit of this embodiment, the standby circuit 1 includes a power management chip U3 and a winding T3. Specifically, the model of the power management chip U3 is EM8564A, the whole standby circuit 1 adopts a single-ended counterattack architecture, 5V/2.5A is output, 380V voltage processed by the PFC circuit 2 is used as a primary side energy source of the standby circuit 1, and Vcc OUT is output after rectification by adding a winding T3 and is output to the voltage regulator circuit 3 as a primary side working voltage.
In the PC power supply circuit described in this embodiment, the PFC circuit 2 includes a rectifier bridge BD1, an inductor L1, a thermistor TH1, a diode D11, a diode D21, a resistor R7, a resistor R11, a MOS transistor Q1, a switch Q8, a switch Q9, a resistor R25, a resistor R28, a resistor R32, a capacitor C2, a resistor R15, a resistor R18, a capacitor C3, and a capacitor C4, the rectifier bridge BD1 is connected to one end of the capacitor C3, one end of the resistor R7, an anode of the diode D21, and one end of the inductor L1, the other end of the inductor L1 is connected to an anode of the diode D11, a cathode of the diode D11 and a cathode of the diode D21 are both connected to one end of the thermistor TH1, and the other end of the thermistor TH1 is connected to the standby circuit 1 and the capacitor C2, respectively; the other end of the resistor R7 is connected with one end of the resistor R11, and the other end of the resistor R11 is grounded; the base electrode of the switching tube Q8 and the base electrode of the switching tube Q9 are both connected with one end of a resistor R25, the collector electrode of the switching tube Q8 is connected with one end of a voltage stabilizing circuit 3 and a capacitor C4, the emitter electrode of the switching tube Q8 is respectively connected with one end of a resistor R28 and the emitter electrode of the switching tube Q9, the other end of the resistor R28 is respectively connected with one end of a resistor R32 and the gate electrode of the MOS tube Q1, and the other end of the resistor R32 is respectively connected with the source electrode of the MOS tube Q1, the other end of the capacitor C4 and the collector electrode of the switching tube Q9.
Specifically, the PFC circuit 2 operates such that when the MOS transistor Q1 is turned on, a current flows through the inductor L1, the current increases linearly before the inductor L1 is unsaturated, electric energy is stored in the inductor L1 in the form of magnetic energy, and at this time, the diode D11 is turned off, the capacitor C2 discharges, and an output voltage is maintained; when the MOS transistor Q1 is turned off, a self-induced electromotive force is generated at two ends of the inductor L1 to keep the current direction unchanged, and the self-induced electromotive force is connected in series with the power source VIN to charge the capacitor C2 and the load through the diode D11.
The diode D21 is used for connecting the 300V pulsating high voltage rectified by the rectifier bridge BD1 to the output of the FPC OUT pin through the diode D21 when the voltage of the PFC circuit 2 is not completely established when the PC is started; when the PFC circuit 2 is turned off due to other reasons, the diode D21 functions as a free-wheeling function; the capacitor C3 is used for correcting the PFC circuit 2, and the PF value can be accurately adjusted to be more than 0.9; the resistor R7 and the resistor R11 can be used as a detection circuit of the input voltage, and the range value of the input voltage can be set; the resistor R15 and the resistor R18 are used as a detection circuit of output voltage, required output voltage can be set, the resistor R25, the resistor R28, the switch tube Q8 and the switch tube Q9 form a driving circuit of the PFC, and driving signals can strengthen driving capability through a push-pull circuit formed by the resistor R25, the resistor R28, the switch tube Q8 and the switch tube Q9.
In the PC power supply circuit of this embodiment, the PWM driving circuit 4 includes a PWM controller U2, a switching transistor Q4, a switching transistor Q5, a resistor R33, a resistor R36, a resistor R37, a resistor R38, a capacitor C20, a capacitor C21, a MOS transistor Q2, a MOS transistor Q3, a diode D3, a winding T2, a capacitor C14, a diode D6, a resistor R17, a resistor R16, and a winding T1; the PWM controller U2 is connected to the base of a switching tube Q4 and the base of a switching tube Q5, the collector of the switching tube Q4 is connected to a voltage stabilizing circuit 3, the emitter of the switching tube Q4 is connected to the emitter of the switching tube Q5, the emitter of the switching tube Q4 and the emitter of the switching tube Q5 are connected to one end of a resistor R37 and one end of a capacitor C21, the other end of the resistor R37 is connected to a resistor R38 and the gate of a MOS tube Q3, the source of the MOS tube Q3, the other end of the resistor R38 and one end of the resistor R36 are connected to one end of a resistor R33, the other end of the resistor R36 is connected to one end of a capacitor C20, the other end of the capacitor C20 is connected to the other end of the resistor R33 and then connected to the PWM controller U2, the other end of the capacitor C21 is connected to the primary winding 2, the drain of the MOS tube Q3 is connected to the anode of the diode D3 and the primary winding 1, the cathode of the diode D3 is connected with the FPC circuit, the secondary side of the winding T2 is connected with one end of a capacitor C14, the primary side of the winding T1, one end of a resistor R17, the cathode of the diode D6 and the source of a MOS tube Q2, the source of the MOS tube Q2 is connected with the primary side of the winding T1, the other end of the capacitor C14 is connected with one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R17 are connected with the gate of the MOS tube Q2, and the drain of the MOS tube Q2 is connected with the FPC circuit.
Specifically, a PWM controller U2 outputs a PWM in signal, which is subjected to push-pull driving by a switching transistor Q4 and a switching transistor Q5 to enhance driving capability, and drives a MOS transistor Q2 and a MOS transistor Q3 to form a twin forward circuit, a winding T2 is used as an isolation driving transformer to divide the PWM signal into alternately conducted driving signals, so that the MOS transistor Q2 and the MOS transistor Q3 are respectively conducted in upper and lower half cycles, and a primary inductor of the winding T1 forms a reciprocating high-frequency current loop, so that a direct-current high voltage is changed into an alternating-current high-frequency voltage to realize a function of changing direct current into alternating current, and a diode D3 and a diode D6 are respectively clamping diodes to reduce or eliminate peaks and the like generated in a switching chamber, thereby reducing stress of the MOS transistor Q2 and the MOS transistor Q3 and simultaneously contributing to suppression of EMI; the resistor R33, the resistor R36 and the capacitor C20 form a primary-side power detection circuit, current flowing through a main loop is detected by the resistor R36 and converted into a voltage signal, the voltage signal is attenuated by the resistor R33 and filtered by the capacitor C20 to generate relatively stable direct-current voltage, the voltage is increased along with the increase of input power and exceeds a set voltage, and after the signal is detected, the internal judgment of overcurrent is carried out, the PFC circuit 2 and the PWM signal are turned off, and the overcurrent protection function is achieved.
In the PC power supply circuit of this embodiment, the first synchronous rectification circuit 5 includes a MOS transistor Q11, a MOS transistor Q12, a capacitor C26, a resistor R39, a capacitor C11, a resistor R19, a capacitor C13, a resistor R21, an inductor L71, an inductor L72, a diode D5, a capacitor C16, a capacitor C5, an inductor L7, an inductor L5, and a capacitor C12; the gate of the MOS transistor Q11, the gate of the MOS transistor Q12, one end of the capacitor C26, the drain of the MOS transistor Q12, the drain of the MOS transistor Q11, one end of the capacitor C13, and one end of the inductor L71 are all connected to the PWM driving circuit 4, the other end of the capacitor C26 is connected to one end of a resistor R39, the other end of the resistor R39 and the source of the MOS transistor Q12 are all connected to the source of the MOS transistor Q11, the source of the MOS transistor Q11 is connected to one end of a capacitor C11 and the cathode of a diode D5, the other end of the capacitor C11 is connected to one end of a resistor R11, the other end of the resistor R11 is connected to the anode of the diode D11 and one end of an inductor L11, the cathode of the diode D11 is connected to one end of the resistor R11, the other end of the inductor L11 is connected to one end of the inductor L11, the other end of the inductance coil L5 is connected with a second synchronous rectification circuit 7, the other end of the capacitance C16 is connected with one end of a capacitance C5 and the cathode of a diode D5, the other end of the capacitance C5 is connected with the other end of the inductance coil L72, the other end of the inductance coil L7 is connected with one end of a capacitance C12, and the common end of the capacitance C12, the capacitance C16 and the capacitance C5 is grounded.
Specifically, the gate of the MOS transistor Q11, the gate of the MOS transistor Q12, one end of the capacitor C26, the drain of the MOS transistor Q12, the drain of the MOS transistor Q11, one end of the capacitor C13, and one end of the inductor L71 are all connected to the secondary side of the winding T1, the winding T1 is connected to the gates of the MOS transistor Q11 and the MOS transistor Q12 by being wound under the action of the winding T1, and the two ends are respectively conducted in the upper half cycle and the lower half cycle, so that the IC required by separate excitation type driving is reduced by a self-coupling mode, the physical space occupied by design is reduced, the MOS transistor is adopted to replace conventional diode rectification, the damage caused by diode voltage drop at the moment of conduction is greatly reduced, the efficiency is improved, and the size of the radiator can be reduced. The inductance coil L71 and the inductance coil L72 are used as choke, and the inductance coil L7, the capacitor C12 and the capacitor C16 are used for filtering.
In the PC power supply circuit of this embodiment, the voltage stabilizing circuit 3 includes a capacitor C47, a resistor R303, a switching tube Q7, a zener diode ZD1, a capacitor C19, and a capacitor C39, a collector of the switching tube Q7 is connected to one end of the resistor R303, one end of the capacitor C47, and the standby circuit 1, a base of the switching tube Q7 is connected to a cathode of the zener diode ZD1, an anode of the zener diode ZD1 is grounded, the capacitor C19 is connected in parallel to the zener diode ZD1, one end of the capacitor C39 is connected to an emitter of the switching tube Q7, and the other end of the capacitor C39 is grounded. Specifically, the standby circuit 1 rectifies and outputs Vcc OUT as Vcc IN to be input to the voltage stabilizing circuit 3, the voltage stabilizing circuit 3 stabilizes voltage, the base of the switching tube Q7 is connected with a PS-ON signal, the switching tube Q7 is turned ON IN a low level state, and the voltage stabilizing diode ZD1 stably clamps the voltage at 18V, so that the working voltage does not exceed a rated voltage, and a primary side signal part stably works.
In the PC power supply circuit of this embodiment, the second synchronous rectification circuit 7 includes an integrated IC chip U8, a switching tube Q501, a switching tube Q502, an inductor L4, a diode D501, a switching tube Q601, a switching tube Q602, an inductor L3, a diode D601, a resistor R505, a capacitor C501, a resistor R610, a resistor R607, a resistor R605, and a capacitor C601, a UGATE1 pin and a PHASE1 pin of the integrated IC chip U8 are connected to a gate of the switching tube Q501, a drain of the switching tube Q501 is connected to one end of the resistor R505, the other end of the resistor R505 is connected to an OCSET1 pin of the integrated IC chip U8, a source of the switching tube Q501 and a drain of the switching tube Q502 are connected to one end of the inductor L4, the other end of the inductor L4 is connected to one end of the resistor R510, the other end of the resistor R510 is connected to one end of the resistor R507, the other end of the resistor R507 is grounded, the capacitor C501 is connected in parallel with the resistor R505, the source of the switching tube Q502 is grounded, and the gate of the switching tube Q502 is connected to the LGATE1 pin of the integrated IC chip U8;
the UGATE2 pin and the PHASE2 pin of the integrated IC chip U8 are both connected with the gate of the switch tube Q601, the LGATE2 pin of the integrated IC chip U8 is connected with the gate of the switch tube Q602, the drain of the switch tube Q601 is connected with one end of the resistor R605, the other end of the resistor R065 is connected with the OCSTATE 2 pin of the integrated IC chip U8, the capacitor C601 is connected in parallel with the resistor R605, the source of the switch tube Q601 and the drain of the switch tube Q602 are both connected with one end of the inductor L3, the other end of the inductor L3 is connected with one end of the resistor R610, the other end of the resistor R610 is connected with one end of the resistor R607, the other end of the resistor R607 is grounded, the source of the switch tube Q602 is grounded, and one end of the resistor R605 is connected with the first synchronous rectification circuit 5.
Specifically, an integrated IC chip U8 is APW7159A, lines for output driving, protection and the like are integrated in one IC, the packaging size is reduced, and simultaneously the same working frequency is adopted, so that the interference of EMI is reduced, wherein a 5V synchronous rectification circuit is formed by the switching tube Q501, the switching tube Q502, the inductance coil L4 and the diode 501, and the diode is replaced by the MOS tube, so that the loss during conduction is greatly reduced, and the efficiency is improved; the switching tube Q601, the switching tube Q602, the inductance coil L3 and the diode D601 form a 3.3V synchronous rectification circuit, the overall efficiency of the switching tube Q601 and the switching tube Q602 can reach more than 90%, and the conversion efficiency is improved, wherein the resistor R510 and the resistor R507 form a detection circuit of output voltage, the resistor R505 and the capacitor C501 form a frequency oscillation circuit, and the working frequency is effectively determined.
In the PC power circuit described in this embodiment, the monitoring circuit 6 includes a power management chip U6, and the model of the power management chip U6 is GR 8313. Specifically, the GR8313 is adopted as the output side monitoring circuit 6 to monitor the voltages of 12V, 5V, 3.3V and-12V, respectively, and the monitoring information of each voltage is collected to the 5 th and 6 th pins of the power management chip U6, and is also used as the short circuit detection function.
Pin 4 of the power management chip U6 is the PS-ON power ON/off signal, active low.
The 1 pin of the power management chip U6 collects the start signal of PG as the input signal of PG, and the 8 pin of the power management chip U6 as the output signal of PG, ensuring PG signal in the range of 100-500 ms.
The resistor R67, the resistor R71, the resistor R78 and the resistor R79 are used as 12V output voltage samples, and the output voltage is ensured to be 11.4V-12.6V.
The 3 feet of the power management chip U6 are used as the output signals of power on/off and protection, the signals are transmitted to the primary side through the optical coupler, and various functions are realized through the method of turning on or off the primary side VCC.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A PC power supply circuit characterized by: the monitoring circuit comprises a standby circuit, a PFC circuit, a voltage stabilizing circuit, a PWM driving circuit, a first synchronous rectification circuit, a second synchronous rectification circuit and a monitoring circuit, wherein the standby circuit is electrically connected with the voltage stabilizing circuit, the PFC circuit, the PWM driving circuit and the monitoring circuit respectively, the PWM driving circuit is electrically connected with the first synchronous rectification circuit, and the first synchronous rectification circuit is electrically connected with the second synchronous rectification circuit.
2. A PC power supply circuit as claimed in claim 1, wherein: the standby circuit includes a power management chip U3 and a winding T3.
3. A PC power supply circuit as claimed in claim 1, wherein: the PFC circuit comprises a rectifier bridge BD1, an inductance coil L1, a thermistor TH1, a diode D11, a diode D21, a resistor R7, a resistor R11, a MOS tube Q1, a switch tube Q8, a switch tube Q9, a resistor R25, a resistor R28, a resistor R32, a capacitor C2, a resistor R15, a resistor R18, a capacitor C3 and a capacitor C4, wherein the rectifier bridge BD1 is connected with one end of the capacitor C3, one end of the resistor R7, an anode of the diode D21 and one end of the inductance coil L1, the other end of the inductance coil L1 is connected with an anode of the diode D11, a cathode of the diode D11 and a cathode of the diode D21 are both connected with one end of the thermistor TH1, and the other end of the thermistor TH1 is respectively connected with a standby circuit and a capacitor C2; the other end of the resistor R7 is connected with one end of the resistor R11, and the other end of the resistor R11 is grounded; the base electrode of the switching tube Q8 and the base electrode of the switching tube Q9 are both connected with one end of a resistor R25, the collector electrode of the switching tube Q8 is connected with a voltage stabilizing circuit and one end of a capacitor C4, the emitter electrode of the switching tube Q8 is respectively connected with one end of a resistor R28 and the emitter electrode of the switching tube Q9, the other end of the resistor R28 is respectively connected with one end of a resistor R32 and the gate electrode of the MOS tube Q1, and the other end of the resistor R32 is respectively connected with the source electrode of the MOS tube Q1, the other end of the capacitor C4 and the collector electrode of the switching tube Q9.
4. A PC power supply circuit as claimed in claim 1, wherein: the PWM driving circuit comprises a PWM controller U2, a switching tube Q4, a switching tube Q5, a resistor R33, a resistor R36, a resistor R37, a resistor R38, a capacitor C20, a capacitor C21, a MOS tube Q2, a MOS tube Q3, a diode D3, a winding T2, a capacitor C14, a diode D6, a resistor R17, a resistor R16 and a winding T1; the PWM controller U2 is connected to the base of a switching tube Q4 and the base of a switching tube Q5, the collector of the switching tube Q4 is connected to a voltage stabilizing circuit, the emitter of the switching tube Q4 is connected to the emitter of the switching tube Q5, the emitters of the switching tube Q4 and the switching tube Q5 are connected to one end of a resistor R37 and one end of a capacitor C21, the other end of the resistor R37 is connected to a resistor R38 and the gate of a MOS tube Q3, the source of the MOS tube Q3, the other end of the resistor R38 and one end of the resistor R36 are connected to one end of a resistor R33, the other end of the resistor R36 is connected to one end of a capacitor C20, the other end of the capacitor C20 is connected to the other end of the resistor R33 and then connected to the PWM controller U2, the other end of the capacitor C21 is connected to the primary side of a winding T2, the drain of the MOS tube Q3 is connected to the anode of a diode D3 and the primary side of the winding 1, the cathode of the diode D3 is connected with the FPC circuit, the secondary side of the winding T2 is connected with one end of a capacitor C14, the primary side of the winding T1, one end of a resistor R17, the cathode of the diode D6 and the source of a MOS tube Q2, the source of the MOS tube Q2 is connected with the primary side of the winding T1, the other end of the capacitor C14 is connected with one end of the resistor R16, the other end of the resistor R16 and the other end of the resistor R17 are connected with the gate of the MOS tube Q2, and the drain of the MOS tube Q2 is connected with the FPC circuit.
5. A PC power supply circuit as claimed in claim 1, wherein: the first synchronous rectification circuit comprises a MOS transistor Q11, a MOS transistor Q12, a capacitor C26, a resistor R39, a capacitor C11, a resistor R19, a capacitor C13, a resistor R21, an inductor L71, an inductor L72, a diode D5, a capacitor C16, a capacitor C5, an inductor L7, an inductor L5 and a capacitor C12; the gate of the MOS transistor Q11, the gate of the MOS transistor Q12, one end of the capacitor C26, the drain of the MOS transistor Q12, the drain of the MOS transistor Q11, one end of the capacitor C13, and one end of the inductor L71 are all connected to the PWM driving circuit, the other end of the capacitor C26 is connected to one end of a resistor R39, the other end of the resistor R39 and the source of the MOS transistor Q12 are both connected to the source of the MOS transistor Q11, the source of the MOS transistor Q11 is connected to one end of a capacitor C11 and the cathode of a diode D5, the other end of the capacitor C11 is connected to one end of a resistor R11, the other end of the resistor R11 is connected to the anode of the diode D11 and one end of an inductor L11, the cathode of the diode D11 is connected to one end of the resistor R11, the other end of the inductor L11 is connected to one end of the inductor L11, the other end of the inductor L5 is connected with a second synchronous rectification circuit, the other end of the capacitor C16 is connected with one end of a capacitor C5 and the cathode of a diode D5, the other end of the capacitor C5 is connected with the other end of the inductor L72, the other end of the inductor L7 is connected with one end of a capacitor C12, and the common end of the capacitor C12, the capacitor C16 and the capacitor C5 is grounded.
6. A PC power supply circuit as claimed in claim 1, wherein: the voltage stabilizing circuit comprises a capacitor C47, a resistor R303, a switch tube Q7, a voltage stabilizing diode ZD1, a capacitor C19 and a capacitor C39, wherein a collector of the switch tube Q7 is respectively connected with one end of the resistor R303, one end of the capacitor C47 and a standby circuit, a base of the switch tube Q7 is connected with a cathode of the voltage stabilizing diode ZD1, an anode of the voltage stabilizing diode ZD1 is grounded, the capacitor C19 is connected with the voltage stabilizing diode ZD1 in parallel, one end of the capacitor C39 is connected with an emitter of the switch tube Q7, and the other end of the capacitor C39 is grounded.
7. A PC power supply circuit as claimed in claim 1, wherein: the second synchronous rectification circuit comprises an integrated IC chip U8, a switching tube Q501, a switching tube Q502, an inductance coil L4, a diode D501, a switching tube Q601, a switching tube Q602, an inductance coil L3, a diode D601, a resistor R505, a capacitor C501, a resistor R610, a resistor R607, a resistor R605 and a capacitor C601, wherein the UGATE1 pin and the PHASE1 pin of the integrated IC chip U8 are connected with the grid electrode of the switching tube Q501, the drain electrode of the switching tube Q501 is connected with one end of the resistor R505, the other end of the resistor R505 is connected with the ET1 pin of the integrated IC chip U8, the source electrode of the switching tube Q501 and the drain electrode of the switching tube Q502 are connected with one end of the inductance coil L4, the other end of the inductance coil L4 is connected with one end of the resistor R510, the other end of the resistor R510 is connected with one end of the resistor R507, the other end of the resistor R507 is grounded, the source electrode of the capacitor C501 is connected with the resistor R505 and the switch Q502 in parallel, the gate of the switch tube Q502 is connected to the LGATE1 pin of the integrated IC chip U8;
the UGATE2 pin and the PHASE2 pin of the integrated IC chip U8 are both connected with the gate of a switch tube Q601, the LGATE2 pin of the integrated IC chip U8 is connected with the gate of a switch tube Q602, the drain of the switch tube Q601 is connected with one end of a resistor R605, the other end of the resistor R065 is connected with the OCSTATE 2 pin of the integrated IC chip U8, the capacitor C601 is connected with the resistor R605 in parallel, the source of the switch tube Q601 and the drain of the switch tube Q602 are both connected with one end of an inductance coil L3, the other end of the inductance coil L3 is connected with one end of a resistor R610, the other end of the resistor R610 is connected with one end of a resistor R607, the other end of the resistor R607 is grounded, the source of the switch tube Q602 is grounded, and one end of the resistor R605 is connected with the first synchronous rectification circuit.
8. A PC power supply circuit as claimed in claim 1, wherein: the monitoring circuit comprises a power management chip U6, and the model of the power management chip U6 is GR 8313.
CN202010443701.8A 2020-05-22 2020-05-22 PC power supply circuit Pending CN111740618A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115776240A (en) * 2023-01-30 2023-03-10 广东优力普物联科技有限公司 High-power flyback boost circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115776240A (en) * 2023-01-30 2023-03-10 广东优力普物联科技有限公司 High-power flyback boost circuit

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