WO2016000259A1 - Power supply - Google Patents

Power supply Download PDF

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Publication number
WO2016000259A1
WO2016000259A1 PCT/CN2014/081654 CN2014081654W WO2016000259A1 WO 2016000259 A1 WO2016000259 A1 WO 2016000259A1 CN 2014081654 W CN2014081654 W CN 2014081654W WO 2016000259 A1 WO2016000259 A1 WO 2016000259A1
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WO
WIPO (PCT)
Prior art keywords
voltage
resistor
power supply
transformer
output
Prior art date
Application number
PCT/CN2014/081654
Other languages
French (fr)
Chinese (zh)
Inventor
王合球
Original Assignee
深圳欧陆通电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳欧陆通电子有限公司 filed Critical 深圳欧陆通电子有限公司
Priority to PCT/CN2014/081654 priority Critical patent/WO2016000259A1/en
Publication of WO2016000259A1 publication Critical patent/WO2016000259A1/en

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Classifications

    • 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

Definitions

  • the present invention relates to the field of power supplies, and more particularly to a power supply.
  • the technical problem to be solved by the present invention is that the above-mentioned power supply device for the prior art cannot meet the large current output defect, and provides a power supply device capable of satisfying a large current output.
  • the technical solution adopted by the present invention to solve the technical problem thereof is: constructing a power supply device, including driving the switch tube, comprising:
  • a transformer having a specific amount of inductance, and the specific amount of inductance causes the transformer to operate in a discontinuous current mode or a critical mode at a rated load;
  • a voltage and current control loop for sampling an output voltage and an input current of the transformer, and feeding back a sampling voltage when the output voltage is higher than a preset value, and feeding back a sampling current when the output voltage is not higher than a preset value ;
  • PWM a control circuit for regulating the transformer through the driving switch tube according to the sampling voltage or the sampling current, and lifting the transformer through the driving switch tube when the output voltage is not higher than a preset value The working frequency.
  • the power supply further includes:
  • a first voltage stabilizing circuit for regulating a voltage rectified by the first rectifier circuit.
  • the voltage current control loop includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a three-terminal a shunt reference source, an optocoupler, wherein the first resistor and the second resistor are connected in series between the output end of the first voltage stabilizing circuit and the ground, and the connection point of the first resistor and the second resistor is connected a reference pole of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is grounded, and a cathode of the three-terminal adjustable shunt reference source is connected to a negative input end of the optocoupler, and the optocoupler is positive
  • the input end is connected to the output end of the first rectifier circuit through the fifth resistor; the first end of the third resistor is connected to the second end of the drive switch tube, and the first end of the drive switch tube is connected
  • the voltage current control loop further includes a voltage stabilizing capacitor, a connection point of the seventh resistor and the sixth resistor at one end of the voltage stabilizing capacitor, and the voltage stabilizing capacitor The other end is grounded.
  • the transformer further includes a second secondary winding
  • the power supply further includes:
  • a second voltage stabilizing circuit for regulating a voltage rectified by the second rectifying circuit, and an output end of the second voltage stabilizing circuit is connected to the PWM The power supply terminal of the control circuit.
  • the output end of the second voltage stabilizing circuit is further connected to the optocoupler positive output terminal through the fourth resistor.
  • the power supply further includes:
  • a diode rectifier bridge used to rectify the EMI filtered voltage and provide a DC voltage to the transformer.
  • the power supply further includes:
  • a third rectifying circuit for rectifying the EMI filtered voltage, and wherein an output of the third rectifying circuit is connected to the PWM The starting end of the control circuit.
  • the power supply further includes:
  • a differential mode inductance connected after the first voltage stabilizing circuit.
  • the power supply further includes:
  • a fuse connected to the common mode inductor.
  • the power supply device can improve the operating frequency of the transformer when outputting at a large current (for example, 6 times of rated current), so that the transformer can achieve anti-saturation, so the power supply can be applied to a capacitive load. And some inductive loads. Moreover, the power supply does not require the use of high power components and high cost wiring, and therefore is less expensive.
  • Embodiment 1 is a logic diagram of Embodiment 1 of a power supply device of the present invention.
  • FIG. 2 is a circuit diagram of a second embodiment of the power supply of the present invention.
  • FIG. 1 is a logic diagram of a first embodiment of a power supply device of the present invention, the power supply including a transformer T101 and a drive switch Q101 a voltage and current control loop 10 and a PWM control circuit 20, wherein the transformer T101 has a specific inductance, and the specific inductance makes the transformer T101 It operates in discontinuous current mode (DCM, Discontinuous Conduction Mode) or critical mode at rated load.
  • Voltage and current control loop 10 It is used to sample the output voltage and input current of the transformer T101, and feed back the sampling voltage when the output voltage is higher than the preset value, and feed back the sampling current when the output voltage is not higher than the preset value.
  • PWM control circuit 20 It is used to regulate the transformer T101 according to the sampling voltage or sampling current through the drive switch Q101, and lift the transformer through the drive switch Q101 when the output voltage is not higher than the preset value.
  • T101 The working frequency.
  • the transformer uses a lower inductance transformer, and the voltage and current control loop samples the output voltage and input current of the transformer, and feeds back the sampling voltage when the output voltage is higher than a preset value.
  • the sampling current is fed back when the output voltage is not higher than the preset value, and then
  • the PWM control circuit adjusts the voltage regulation of the transformer according to the sampling voltage or the sampling current, and the output voltage is not higher than a preset value (ie, the output current is large, for example, 6)
  • a preset value ie, the output current is large, for example, 6
  • the operating frequency of the transformer is increased, thereby reducing the inductance of the transformer, so that the transformer achieves the purpose of anti-saturation, and the loop control is stable.
  • the power supply mainly includes a diode rectifier bridge D104, a transformer T101, drive switch, voltage and current control loop, PWM a control circuit, a first rectifier circuit, a first voltage regulator circuit, a second rectifier circuit, a second voltage regulator circuit, and a third rectifier circuit.
  • the power supply is specified below:
  • the PWM control circuit includes a power management chip U101, and the drive switch is a MOS transistor Q101.
  • the first end of CN101 is connected to common mode inductor through fuse F101 and thermistor NTC101.
  • the first input end of the LF101, the second end of the AC voltage interface CN101 is connected to the second input end of the common mode inductor LF101, and the two output ends of the common mode inductor LF101 are respectively connected to the common mode inductor
  • the two inputs of the LF102, the common output of the LF102 are connected to the two inputs of the diode rectifier bridge D104.
  • Electrolytic capacitor C101, capacitor C112, C102 Parallel between the two outputs of the diode rectifier bridge D104.
  • the transformer's primary winding T101-A is connected to the positive output of the diode rectifier bridge D104.
  • the first ends of R106, R105 and capacitor C103 are respectively connected to the positive output terminal of the diode rectifier bridge D104, and the primary winding of the transformer T101-A has the same name terminal connection capacitor C105.
  • the first ends of the resistors R106 and R105 are respectively connected to the first ends of the resistors R108 and R107, and the second ends of the capacitors C103 are respectively connected to the resistors R109 and R110.
  • the second ends of the resistors R107, R108, R109, and R110 are respectively connected to the second ends of the capacitors C105.
  • the same name of the first secondary winding T101-C of the transformer is connected to the diode D201,
  • the anode of D202, the cathodes of diodes D201 and D202 are respectively connected to the anode of electrolytic capacitors C201 and C202 and the first end of inductor L201, inductor L201
  • the second end is connected to the positive terminal of the electrolytic capacitor C203 and the first input of the differential mode inductor LF201, the negative electrode of the electrolytic capacitors C201, C202, C203 and the differential mode inductance LF201
  • the second input terminals are respectively grounded, and the two output terminals of the differential mode inductor LF201 are the output terminals of the power supply.
  • diodes D201 and D202 form a first rectifier circuit for The output voltage of the first secondary winding T101-C of the transformer is rectified.
  • Electrolytic capacitors C201, C202, C203 and inductor L201 form the first voltage regulator circuit. It is used to regulate the voltage rectified by the first rectifier circuit.
  • the second end of the transformer, the second end of the winding T101-B is connected to the anode of the diode D102, and the cathode of the diode D102 is connected to the anode.
  • R127 is connected to the power supply terminal (VCC) of the power management chip U101.
  • the electrolytic capacitor C104 and capacitor C107 are connected in parallel to the power supply terminal of the power management chip U101 (VCC).
  • the diode D102 and the resistor R127 constitute a second rectifier circuit for rectifying the voltage of the second secondary winding T101-B of the transformer.
  • Electrolytic capacitor C104 and capacitor C107 constitutes a second voltage stabilizing circuit for regulating the voltage rectified by the second rectifying circuit.
  • resistors R205, R207, R206 It is connected in series between the output of the first voltage stabilizing circuit and the ground. It should be noted that the resistor R205 and the resistor R207 can be replaced by a resistor. Resistor R207 and resistor R206 Connection point connection three-terminal adjustable shunt reference source U3 reference pole, three-terminal adjustable shunt reference source U3 anode grounding, three-terminal adjustable shunt reference source U3 cathode-connected optocoupler illuminator U201-A At the negative input, the positive input of the optocoupler illuminator U201-A is connected to the output of the first rectifier circuit via resistor R204.
  • the first end of the resistor R101 is connected to the source of the MOS transistor Q101.
  • the drain of the MOS transistor Q101 is connected to the primary winding of the transformer T101-A, and the gate of the MOS transistor Q101 is connected to the resistor R118 (resistor R118). Can be omitted) connected to the output of power management chip U101 (OUT), the second end of resistor R101 is grounded, the first end of resistor R101 also passes through resistor R126 and resistor R129
  • the negative output of the photocoupler U201-B connected to the optocoupler, the positive output of the optocoupler U201-B is connected to the output of the second regulator through the resistor R123.
  • Resistor R126 and resistor R129 The connection point is connected to the current detection terminal (CS) of the power management chip U101.
  • one end of the voltage stabilizing capacitor C111 is connected to the connection point of the resistor R126 and the resistor R129, and the voltage stabilizing capacitor C111 The other end is grounded.
  • the first output of the common mode inductor LF102 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the resistor R111.
  • the second output of the common mode inductor LF102 is connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is passed through the resistor R112.
  • Diodes D1, D2 and resistors R111 and R112 form a third rectifier circuit for EMI The filtered voltage is rectified and a startup voltage is supplied to the power management chip U101.
  • the output voltage of the second secondary winding T101-B of the transformer is rectified by diode D102, resistor R127, and passed through electrolytic capacitor C104 and capacitor.
  • the C107 is regulated to supply power to the power management chip U101.
  • the resistors R205, R207, R206 The output voltage is sampled by dividing the output voltage of the transformer.
  • the resistor R101 samples the input current of the transformer, and the sampling voltage and the sampling current are fed back to the power management chip U101.
  • the current sense terminal (CS) allows the output to be fast and the loop stable when the output switches between a high current state and a light/no load state.
  • the sampling voltage is large, and the three-terminal adjustable shunt reference source U3 Because the reference pole voltage is higher than the reference voltage, the optocoupler U201 is turned on.
  • the power management chip U101 detects the voltage of the current detecting terminal (CS) (the voltage at no load is slightly less than 0.85V).
  • the light load CS pin voltage is slightly larger than 1V) to judge the current state.
  • the output terminal (OUT) will go to the MOS transistor.
  • the duty cycle of the PWM signal output by Q101 is turned down; on the contrary, if it detects that the voltage of its current detecting terminal (CS) is lower than the set value, it will go to the MOS transistor Q101 through its output terminal (OUT).
  • the duty cycle of the output PWM signal is raised.
  • the sampling voltage is instantaneously reduced, and the three-terminal adjustable shunt reference source U3 Because the reference voltage is not greater than the reference voltage, the optocoupler U201 is turned off.
  • the power management chip U101 detects the voltage of the current detecting terminal (CS) (about 0.2V-0.3V). ) can judge the current state.
  • it detects that the voltage of its current detecting terminal (CS) is lower than the set value it will output PWM to the MOS transistor Q101 through its output terminal (OUT).
  • the duty cycle and frequency of the signal are raised (for example, up to 2 octaves) to store more energy in the transformer, causing the output voltage to rise to the operating voltage of the three-terminal adjustable shunt reference source U3. Then through the three-terminal adjustable shunt reference source U3 and optocoupler U201 feed back the sampled output voltage to power management chip U101, and also through the above-mentioned real-time sampling and adjustment, so that the power supply achieves the purpose of constant voltage output.
  • the power management chip U101 can be used. Internal oscillator adjustment. Of course, it is also possible to add a frequency adjustment circuit to the outside of the power management chip U101.

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

Abstract

A power supply. The power supply comprises: a drive switch transistor (Q101). The power supply also comprises: a transformer (T101) that has a specific sense quantity, wherein the transformer (T101) that haves a specific sense works in discontinuous current mode or a critical mode under a rated load; a voltage and current control loop (10), used for sampling an output voltage and an input current of the transformer (T101), feeding back a sampled voltage when the output voltage is higher than a preset value, and feeding back a sampled current when the output voltage is not higher than the preset value; and a PWM control circuit (20), used for performing, by means of the drive switch transistor (Q101), voltage stabilization adjustment on the transformer (T101) according to the sampled voltage or the sampled current, and for enhancing the work frequency of the transformer (T101) by means of the drive switch transistor (Q101) when the output voltage is not higher than the preset value.

Description

一种电源供应器  Power supply 技术领域Technical field
本发明涉及电源领域，尤其涉及一种电源供应器 。  The present invention relates to the field of power supplies, and more particularly to a power supply.
背景技术Background technique
由于目前小型化低成本是电源供应器的发展趋势，一些特殊设备对电源的性能要求越来越高，例如，一些容性负载和一些感性负载，在启动和工作中需要一定时间的 2-3 倍额定电流甚至 6 倍以上的额定电流。传统的电源供应器已经无法满足六倍以上的额定电流输出，比如 LLC 谐振、 QR （ Quasi-Resonant ，准谐振）及一些额定负载都要工作在 CCM （ Continuous Current Mode ，连续电流模式）的架构，这些线路的拓扑在输出电流较大时，会出现强烈的降频，进而会出现变压器的饱和以及 CCM 模式的磁饱和 。 Due to the current trend of miniaturization and low cost, the performance of power supplies is increasing. Some special devices require higher performance for power supplies. For example, some capacitive loads and some inductive loads require a certain amount of time during startup and operation. The rated current is even more than 6 times the rated current. Traditional power supplies are no longer able to meet more than six times the rated current output, such as LLC Resonance, QR (Quasi-Resonant , quasi-resonant) and some rated loads must work in CCM (Continuous Current Mode , continuous current mode) architecture, the topology of these lines will have a strong frequency reduction when the output current is large, and then the saturation of the transformer and the magnetic saturation of the CCM mode will occur.
发明内容Summary of the invention
本发明要解决的技术问题在于，针对现有技术的上述电源供应器无法满足大电流输出缺陷，提供一种能满足大电流输出的电源供应器。 The technical problem to be solved by the present invention is that the above-mentioned power supply device for the prior art cannot meet the large current output defect, and provides a power supply device capable of satisfying a large current output.
本发明解决其技术问题所采用的技术方案是：构造一种电源供应器，包括驱动开关管，包括： The technical solution adopted by the present invention to solve the technical problem thereof is: constructing a power supply device, including driving the switch tube, comprising:
具有特定感量的变压器，且所述特定感量使所述变压器在额定负载时工作在断续电流模式或临界模式； a transformer having a specific amount of inductance, and the specific amount of inductance causes the transformer to operate in a discontinuous current mode or a critical mode at a rated load;
电压电流控制环路，用于采样所述变压器的输出电压和输入电流，并在所述输出电压高于预设值时反馈采样电压，在所述输出电压不高于预设值时反馈采样电流； a voltage and current control loop for sampling an output voltage and an input current of the transformer, and feeding back a sampling voltage when the output voltage is higher than a preset value, and feeding back a sampling current when the output voltage is not higher than a preset value ;
PWM 控制电路，用于根据采样电压或采样电流通过所述驱动开关管对所述变压器进行稳压调节，并在所述输出电压不高于预设值时，通过所述驱动开关管提升所述变压器的工作频率。 PWM a control circuit for regulating the transformer through the driving switch tube according to the sampling voltage or the sampling current, and lifting the transformer through the driving switch tube when the output voltage is not higher than a preset value The working frequency.
在本发明所述的电源供应器中，所述电源供应器还包括： In the power supply of the present invention, the power supply further includes:
用于对所述变压器的第一次级绕组的输出电压进行整流的第一整流电路；及 a first rectifying circuit for rectifying an output voltage of the first secondary winding of the transformer; and
用于对经所述第一整流电路整流后的电压进行稳压的第一稳压电路。 a first voltage stabilizing circuit for regulating a voltage rectified by the first rectifier circuit.
在本发明所述的电源供应器中，所述电压电流控制环路包括第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻、第七电阻、三端可调分流基准源、光耦，其中，所述第一电阻和第二电阻串联在所述第一稳压电路的输出端和地之间，所述第一电阻和第二电阻的连接点连接所述三端可调分流基准源的参考极，所述三端可调分流基准源的阳极接地，三端可调分流基准源的阴极连接所述光耦的负输入端，所述光耦的正输入端通过所述第五电阻接所述第一整流电路的输出端；所述第三电阻的第一端连接所述驱动开关管的第二端，所述驱动开关管的第一端连接所述变压器的初级绕组的同名端，所述驱动开关管的控制端连接所述 PWM 控制电路的输出端，所述第三电阻的第二端接地，所述第三电阻的第一端还通过所述第七电阻和第六电阻连接所述光耦的负输出端，所述光耦正输出端通过所述第四电阻连接高电平；所述第七电阻和第六电阻的连接点连接所述 PWM 控制电路的电流检测端。 In the power supply device of the present invention, the voltage current control loop includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a three-terminal a shunt reference source, an optocoupler, wherein the first resistor and the second resistor are connected in series between the output end of the first voltage stabilizing circuit and the ground, and the connection point of the first resistor and the second resistor is connected a reference pole of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is grounded, and a cathode of the three-terminal adjustable shunt reference source is connected to a negative input end of the optocoupler, and the optocoupler is positive The input end is connected to the output end of the first rectifier circuit through the fifth resistor; the first end of the third resistor is connected to the second end of the drive switch tube, and the first end of the drive switch tube is connected The same name end of the primary winding of the transformer, the control end of the drive switch tube is connected to the PWM An output end of the control circuit, the second end of the third resistor is grounded, and the first end of the third resistor is further connected to the negative output end of the optocoupler through the seventh resistor and the sixth resistor, the light The positive output terminal is connected to the high level through the fourth resistor; the connection point of the seventh resistor and the sixth resistor is connected to the The current detection terminal of the PWM control circuit.
在本发明所述的电源供应器中，所述电压电流控制环路还包括稳压电容，所述稳压电容的一端所述第七电阻和第六电阻的连接点，所述稳压电容的另一端接地。 In the power supply device of the present invention, the voltage current control loop further includes a voltage stabilizing capacitor, a connection point of the seventh resistor and the sixth resistor at one end of the voltage stabilizing capacitor, and the voltage stabilizing capacitor The other end is grounded.
在本发明所述的电源供应器中，所述变压器还包括第二次级绕组； In the power supply of the present invention, the transformer further includes a second secondary winding;
所述电源供应器还包括： The power supply further includes:
用于对所述第二次级绕组的电压进行整流的第二整流电路；及 a second rectifier circuit for rectifying a voltage of the second secondary winding; and
用于对经所述第二整流电路整流后的电压进行稳压的第二稳压电路，而且，所述第二稳压电路的输出端连接所述 PWM 控制电路的电源端。 a second voltage stabilizing circuit for regulating a voltage rectified by the second rectifying circuit, and an output end of the second voltage stabilizing circuit is connected to the PWM The power supply terminal of the control circuit.
在本发明所述的电源供应器中，所述第二稳压电路的输出端还通过所述第四电阻连接所述光耦正输出端。 In the power supply device of the present invention, the output end of the second voltage stabilizing circuit is further connected to the optocoupler positive output terminal through the fourth resistor.
在本发明所述的电源供应器中，所述电源供应器还包括： In the power supply of the present invention, the power supply further includes:
用于对交流输入电压进行 EMI 滤波的至少一个共模电感； At least one common mode inductor for EMI filtering the AC input voltage;
用于对 EMI 滤波后的电压进行整流并为所述变压器提供直流电压的二极管整流桥。 A diode rectifier bridge used to rectify the EMI filtered voltage and provide a DC voltage to the transformer.
在本发明所述的电源供应器中，所述电源供应器还包括： In the power supply of the present invention, the power supply further includes:
用于对 EMI 滤波后的电压进行整流的第三整流电路，而且，所述第三整流电路的输出端连接所述 PWM 控制电路的启动端。 a third rectifying circuit for rectifying the EMI filtered voltage, and wherein an output of the third rectifying circuit is connected to the PWM The starting end of the control circuit.
在本发明所述的电源供应器中，所述电源供应器还包括： In the power supply of the present invention, the power supply further includes:
连接在所述第一稳压电路后的差模电感。 A differential mode inductance connected after the first voltage stabilizing circuit.
在本发明所述的电源供应器中，所述电源供应器还包括： In the power supply of the present invention, the power supply further includes:
连接在所述共模电感前的保险丝。 A fuse connected to the common mode inductor.
实施本发明的技术方案，该电源供应器通过在大电流（例如， 6 倍额定电流）输出时提升变压器的工作频率，使变压器达到抗饱和的目的，因此该电源供应器可适用于容性负载和一些感性负载 。而且， 该电源供应器不需要使用高功率的元件和高成本的线路，因此成本较低。 In the technical solution of the present invention, the power supply device can improve the operating frequency of the transformer when outputting at a large current (for example, 6 times of rated current), so that the transformer can achieve anti-saturation, so the power supply can be applied to a capacitive load. And some inductive loads. Moreover, the power supply does not require the use of high power components and high cost wiring, and therefore is less expensive.
附图说明DRAWINGS
下面将结合附图及实施例对本发明作进一步说明，附图中： The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:
图 1 是本发明 电源供应器实施例一的逻辑图； 1 is a logic diagram of Embodiment 1 of a power supply device of the present invention;
图 2 是本发明电源供应器实施例二的电路图。 2 is a circuit diagram of a second embodiment of the power supply of the present invention.
具体实施方式detailed description
图 1 本发明电源供应器实施例一的逻辑图，该电源供应器包括变压器 T101 、驱动开关管 Q101 、电压电流控制环路 10 和 PWM 控制电路 20 ，其中，变压器 T101 具有特定感量，且所述特定感量使变压器 T101 在额定负载时工作在断续电流模式（ DCM ， Discontinuous Conduction Mode ）或临界模式。 电压电流控制环路 10 用于采样变压器 T101 的输出电压和输入电流，并在输出电压高于预设值时反馈采样电压，在输出电压不高于预设值时反馈采样电流。 PWM 控制电路 20 用于根据采样电压或采样电流通过驱动开关管 Q101 对变压器 T101 进行稳压调节，并在输出电压不高于预设值时，通过驱动开关管 Q101 提升变压器 T101 的工作频率。在该实施例的电源供应器中，变压器选用较低感量的变压器，而且，通过电压电流控制环路采样变压器的输出电压和输入电流，并在输出电压高于预设值时反馈采样电压，在输出电压不高于预设值时反馈采样电流，然后， PWM 控制电路根据采样电压或采样电流通过对变压器进行稳压调节，并在输出电压不高于预设值（即，输出电流较大，例如为 6 倍额定电流）时，提升所述变压器的工作频率，从而降低变压器的感量，使变压器达到抗饱和的目的，而且，环路控制稳定。 1 is a logic diagram of a first embodiment of a power supply device of the present invention, the power supply including a transformer T101 and a drive switch Q101 a voltage and current control loop 10 and a PWM control circuit 20, wherein the transformer T101 has a specific inductance, and the specific inductance makes the transformer T101 It operates in discontinuous current mode (DCM, Discontinuous Conduction Mode) or critical mode at rated load. Voltage and current control loop 10 It is used to sample the output voltage and input current of the transformer T101, and feed back the sampling voltage when the output voltage is higher than the preset value, and feed back the sampling current when the output voltage is not higher than the preset value. PWM control circuit 20 It is used to regulate the transformer T101 according to the sampling voltage or sampling current through the drive switch Q101, and lift the transformer through the drive switch Q101 when the output voltage is not higher than the preset value. T101 The working frequency. In the power supply of this embodiment, the transformer uses a lower inductance transformer, and the voltage and current control loop samples the output voltage and input current of the transformer, and feeds back the sampling voltage when the output voltage is higher than a preset value. The sampling current is fed back when the output voltage is not higher than the preset value, and then The PWM control circuit adjusts the voltage regulation of the transformer according to the sampling voltage or the sampling current, and the output voltage is not higher than a preset value (ie, the output current is large, for example, 6) When the rated current is increased, the operating frequency of the transformer is increased, thereby reducing the inductance of the transformer, so that the transformer achieves the purpose of anti-saturation, and the loop control is stable.
图 2 是本发明电源供应器实施例二的电路图，该电源供应器主要包括二极管整流桥 D104 、变压器 T101 、驱动开关管、电压电流控制环路、 PWM 控制电路、第一整流电路、第一稳压电路、第二整流电路、第二稳压电路、第三整流电路。下面具体说明该电源供应器： 2 is a circuit diagram of a second embodiment of a power supply device of the present invention, the power supply mainly includes a diode rectifier bridge D104, a transformer T101, drive switch, voltage and current control loop, PWM a control circuit, a first rectifier circuit, a first voltage regulator circuit, a second rectifier circuit, a second voltage regulator circuit, and a third rectifier circuit. The power supply is specified below:
PWM 控制电路包括电源管理芯片 U101 ，驱动开关管为 MOS 管 Q101 。 The PWM control circuit includes a power management chip U101, and the drive switch is a MOS transistor Q101.
交流电压接口 CN101 的第一端通过保险丝 F101 、热敏电阻 NTC101 连接共模电感 LF101 的第一输入端，交流电压接口 CN101 的第二端连接共模电感 LF101 的第二输入端，共模电感 LF101 的两个输出端分别连接共模电感 LF102 的两个输入端，共模电感 LF102 的两个输出端连接二极管整流桥 D104 的两个输入端。电解电容 C101 、电容 C112 、 C102 并联在二极管整流桥 D104 的两个输出端之间。 AC voltage interface The first end of CN101 is connected to common mode inductor through fuse F101 and thermistor NTC101. The first input end of the LF101, the second end of the AC voltage interface CN101 is connected to the second input end of the common mode inductor LF101, and the two output ends of the common mode inductor LF101 are respectively connected to the common mode inductor The two inputs of the LF102, the common output of the LF102, are connected to the two inputs of the diode rectifier bridge D104. Electrolytic capacitor C101, capacitor C112, C102 Parallel between the two outputs of the diode rectifier bridge D104.
在变压器的一次侧，变压器的初级绕组 T101-A 的异名端连接二极管整流桥 D104 的正输出端，电阻 R106 、 R105 和电容 C103 的第一端分别连接二极管整流桥 D104 的正输出端，变压器的初级绕组 T101-A 的同名端连接电容 C105 的第一端，电阻 R106 、 R105 的第二端分别连接电阻 R108 、 R107 的第一端，电容 C103 的第二端分别连接电阻 R109 、 R110 的第一端，电阻 R107 、 R108 、 R109 、 R110 的第二端分别连接电容 C105 的第二端。 On the primary side of the transformer, the transformer's primary winding T101-A is connected to the positive output of the diode rectifier bridge D104. The first ends of R106, R105 and capacitor C103 are respectively connected to the positive output terminal of the diode rectifier bridge D104, and the primary winding of the transformer T101-A has the same name terminal connection capacitor C105. The first ends of the resistors R106 and R105 are respectively connected to the first ends of the resistors R108 and R107, and the second ends of the capacitors C103 are respectively connected to the resistors R109 and R110. At the first end, the second ends of the resistors R107, R108, R109, and R110 are respectively connected to the second ends of the capacitors C105.
在变压器 T101 的二次侧，变压器的第一次级绕组 T101-C 的同名端分别连接二极管 D201 、 D202 的正极，二极管 D201 、 D202 的负极分别接电解电容 C201 、 C202 的正极及电感 L201 的第一端，电感 L201 的第二端连接电解电容 C203 的正极和差模电感 LF201 的第一输入端，电解电容 C201 、 C202 、 C203 的负极及差模电感 LF201 的第二输入端分别接地，差模电感 LF201 的两个输出端为该电源供应器的输出端。其中，二极管 D201 、 D202 组成第一整流电路，用于对 变压器的第一次级绕组 T101-C 的输出电压进行整流。电解电容 C201 、 C202 、 C203 及电感 L201 组成第一稳压电路， 用于对经第一整流电路整流后的电压进行稳压。另外，变压器的第二次级绕组 T101-B 的同名端连接二极管 D102 的正极，二极管 D102 的负极通过电阻 R127 连接电源管理芯片 U101 的电源端（ VCC ），电解电容 C104 和电容 C107 并联在电源管理芯片 U101 的电源端（ VCC ）和地之间。其中，二极管 D102 和电阻 R127 构成 第二整流电路，用于对变压器的第二次级绕组 T101-B 的电压进行整流。电解电容 C104 和电容 C107 构成第二稳压电路，用于 对经第二整流电路整流后的电压进行稳压。 On the secondary side of the transformer T101, the same name of the first secondary winding T101-C of the transformer is connected to the diode D201, The anode of D202, the cathodes of diodes D201 and D202 are respectively connected to the anode of electrolytic capacitors C201 and C202 and the first end of inductor L201, inductor L201 The second end is connected to the positive terminal of the electrolytic capacitor C203 and the first input of the differential mode inductor LF201, the negative electrode of the electrolytic capacitors C201, C202, C203 and the differential mode inductance LF201 The second input terminals are respectively grounded, and the two output terminals of the differential mode inductor LF201 are the output terminals of the power supply. Wherein, diodes D201 and D202 form a first rectifier circuit for The output voltage of the first secondary winding T101-C of the transformer is rectified. Electrolytic capacitors C201, C202, C203 and inductor L201 form the first voltage regulator circuit. It is used to regulate the voltage rectified by the first rectifier circuit. In addition, the second end of the transformer, the second end of the winding T101-B, is connected to the anode of the diode D102, and the cathode of the diode D102 is connected to the anode. R127 is connected to the power supply terminal (VCC) of the power management chip U101. The electrolytic capacitor C104 and capacitor C107 are connected in parallel to the power supply terminal of the power management chip U101 (VCC). Between the ground and the ground. The diode D102 and the resistor R127 constitute a second rectifier circuit for rectifying the voltage of the second secondary winding T101-B of the transformer. Electrolytic capacitor C104 and capacitor C107 constitutes a second voltage stabilizing circuit for regulating the voltage rectified by the second rectifying circuit.
在电压电流控制环路中，电阻 R205 、 R207 、 R206 串联在第一稳压电路的输出端和地之间，在此需说明的是，电阻 R205 和电阻 R207 可由一个电阻替代。电阻 R207 和电阻 R206 的连接点连接三端可调分流基准源 U3 的参考极，三端可调分流基准源 U3 的阳极接地，三端可调分流基准源 U3 的阴极连接光耦的发光器 U201-A 的负输入端，光耦的发光器 U201-A 的正输入端通过电阻 R204 接第一整流电路的输出端。电阻 R101 的第一端连接 MOS 管 Q101 的源极， MOS 管 Q101 的漏极连接变压器的初级绕组 T101-A 的同名端， MOS 管 Q101 的栅极通过电阻 R118 （电阻 R118 可省去）连接电源管理芯片 U101 的输出端（ OUT ），电阻 R101 的第二端接地，电阻 R101 的第一端还通过电阻 R126 和电阻 R129 连接光耦的受光器 U201-B 的负输出端，光耦的受光器 U201-B 的正输出端通过电阻 R123 接第二稳压电路的输出端。电阻 R126 和电阻 R129 的连接点连接电源管理芯片 U101 的电流检测端（ CS ）。另外，稳压电容 C111 的一端接电阻 R126 和电阻 R129 的连接点，稳压电容 C111 的另一端接地。 In the voltage and current control loop, resistors R205, R207, R206 It is connected in series between the output of the first voltage stabilizing circuit and the ground. It should be noted that the resistor R205 and the resistor R207 can be replaced by a resistor. Resistor R207 and resistor R206 Connection point connection three-terminal adjustable shunt reference source U3 reference pole, three-terminal adjustable shunt reference source U3 anode grounding, three-terminal adjustable shunt reference source U3 cathode-connected optocoupler illuminator U201-A At the negative input, the positive input of the optocoupler illuminator U201-A is connected to the output of the first rectifier circuit via resistor R204. The first end of the resistor R101 is connected to the source of the MOS transistor Q101. The drain of the MOS transistor Q101 is connected to the primary winding of the transformer T101-A, and the gate of the MOS transistor Q101 is connected to the resistor R118 (resistor R118). Can be omitted) connected to the output of power management chip U101 (OUT), the second end of resistor R101 is grounded, the first end of resistor R101 also passes through resistor R126 and resistor R129 The negative output of the photocoupler U201-B connected to the optocoupler, the positive output of the optocoupler U201-B is connected to the output of the second regulator through the resistor R123. Resistor R126 and resistor R129 The connection point is connected to the current detection terminal (CS) of the power management chip U101. In addition, one end of the voltage stabilizing capacitor C111 is connected to the connection point of the resistor R126 and the resistor R129, and the voltage stabilizing capacitor C111 The other end is grounded.
另外，共模电感 LF102 的第一输出端连接二极管 D1 的正极，二极管 D1 的负极通过电阻 R111 连接电源管理芯片 U101 的启动端（ HW ），共模电感 LF102 的第二输出端连接二极管 D2 的正极，二极管 D2 的负极通过电阻 R112 连接电源管理芯片 U101 的启动端（ HW ）。二极管 D1 、 D2 和电阻 R111 、 R112 构成第三整流电路，用于 对 EMI 滤波后的电压进行整流，且为电源管理芯片 U101 提供启动电压。 In addition, the first output of the common mode inductor LF102 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the resistor R111. Connect the start terminal (HW) of the power management chip U101, the second output of the common mode inductor LF102 is connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is passed through the resistor R112. Connect to the start (HW) of the power management chip U101. Diodes D1, D2 and resistors R111 and R112 form a third rectifier circuit for EMI The filtered voltage is rectified and a startup voltage is supplied to the power management chip U101.
下面说明该电源供应器的工作原理：交流输入电压经保险丝 F101 、热敏电阻 NTC101 、两个共模电感 LF101 、 LF102 后送入二极管整流桥 D104 进行整流，整流后的电压通过电解电容 C101 、电容 C112 、 C102 稳压后为变压器的原边绕组 T101-A 提供直流电压。经耦合后，变压器的第一次级绕组 T101-C 的输出电压经二极管 D201 、 D202 整流及经电解电容 C201 、 C202 、 C203 和电感 L201 稳压后，送入差模电感 LF201 滤除差模干扰，然后输出给负载。同时，变压器的第二次级绕组 T101-B 的输出电压经二极管 D102 、电阻 R127 整流及经电解电容 C104 、电容 C107 稳压后为电源管理芯片 U101 供电。 The following describes the working principle of the power supply: AC input voltage through fuse F101, thermistor NTC101, two common mode inductors LF101 and LF102 are sent to the diode rectifier bridge D104 for rectification, and the rectified voltage passes through electrolytic capacitor C101, capacitor C112, C102. After voltage regulation, DC voltage is supplied to the primary winding T101-A of the transformer. After coupling, the output voltage of the first secondary winding T101-C of the transformer passes through diodes D201 and D202. Rectifier and electrolytic capacitors C201, C202, C203 and inductor L201 are regulated and fed into differential mode inductor LF201 The differential mode interference is filtered out and then output to the load. At the same time, the output voltage of the second secondary winding T101-B of the transformer is rectified by diode D102, resistor R127, and passed through electrolytic capacitor C104 and capacitor. The C107 is regulated to supply power to the power management chip U101.
另外，在该电源供应器工作时，电阻 R205 、 R207 、 R206 通过对变压器的输出电压进行分压来对输出电压进行采样，电阻 R101 采样变压器的输入电流，而且，采样电压和采样电流都反馈在电源管理芯片 U101 的电流检测端（ CS ），使输出在大电流状态和轻 / 空载状态之间切换时，反馈速度快且环路稳定。 In addition, when the power supply is working, the resistors R205, R207, R206 The output voltage is sampled by dividing the output voltage of the transformer. The resistor R101 samples the input current of the transformer, and the sampling voltage and the sampling current are fed back to the power management chip U101. The current sense terminal (CS) allows the output to be fast and the loop stable when the output switches between a high current state and a light/no load state.
当工作在轻 / 空载状态时，采样电压较大，三端可调分流基准源 U3 因其参考极电压大于基准电压而导通，进而光耦 U201 导通，此时，电源管理芯片 U101 通过检测其电流检测端（ CS ）的电压（空载时电压略小于 0.85V ，轻载 CS 脚的电压略大于 1V ）便可判断当前的状态，同时，若其检测其电流检测端（ CS ）的电压高于设定值，则通过其输出端（ OUT ）将向 MOS 管 Q101 输出的 PWM 信号的占空比调低；相反，若其检测其电流检测端（ CS ）的电压低于设定值，则通过其输出端（ OUT ）将向 MOS 管 Q101 输出的 PWM 信号的占空比调高。通过以上实时采样和调整，使该电源供应器达到恒压输出的目的。 When working in the light/no load state, the sampling voltage is large, and the three-terminal adjustable shunt reference source U3 Because the reference pole voltage is higher than the reference voltage, the optocoupler U201 is turned on. At this time, the power management chip U101 detects the voltage of the current detecting terminal (CS) (the voltage at no load is slightly less than 0.85V). The light load CS pin voltage is slightly larger than 1V) to judge the current state. At the same time, if it detects that the current detection terminal (CS) voltage is higher than the set value, then the output terminal (OUT) will go to the MOS transistor. The duty cycle of the PWM signal output by Q101 is turned down; on the contrary, if it detects that the voltage of its current detecting terminal (CS) is lower than the set value, it will go to the MOS transistor Q101 through its output terminal (OUT). The duty cycle of the output PWM signal is raised. Through the above real-time sampling and adjustment, the power supply achieves the purpose of constant voltage output.
当工作在大的输出电流（例如， 6 倍额定电流）状态时，采样电压瞬间降低，三端可调分流基准源 U3 因其参考极电压不大于基准电压而截止，进而光耦 U201 截止，此时，电源管理芯片 U101 通过检测其电流检测端（ CS ）的电压（约 0.2V-0.3V ）便可判断当前的状态。同时，其检测其电流检测端（ CS ）的电压低于设定值，则通过其输出端（ OUT ）将向 MOS 管 Q101 输出的 PWM 信号的占空比和频率调高（例如，最高 2 倍频），以在变压器中储存更多的能量，使输出电压提升到三端可调分流基准源 U3 的动作电压。然后再通过三端可调分流基准源 U3 和光耦 U201 将采样的输出电压反馈到电源管理芯片 U101 ，同样经过上述实时采样和调整，使该电源供应器达到恒压输出的目的。 When operating at a large output current (for example, 6 times rated current), the sampling voltage is instantaneously reduced, and the three-terminal adjustable shunt reference source U3 Because the reference voltage is not greater than the reference voltage, the optocoupler U201 is turned off. At this time, the power management chip U101 detects the voltage of the current detecting terminal (CS) (about 0.2V-0.3V). ) can judge the current state. At the same time, when it detects that the voltage of its current detecting terminal (CS) is lower than the set value, it will output PWM to the MOS transistor Q101 through its output terminal (OUT). The duty cycle and frequency of the signal are raised (for example, up to 2 octaves) to store more energy in the transformer, causing the output voltage to rise to the operating voltage of the three-terminal adjustable shunt reference source U3. Then through the three-terminal adjustable shunt reference source U3 and optocoupler U201 feed back the sampled output voltage to power management chip U101, and also through the above-mentioned real-time sampling and adjustment, so that the power supply achieves the purpose of constant voltage output.
关于输出至 MOS 管 Q101 的 PWM 信号的频率调整，可通过电源管理芯片 U101 内部的振荡器调整。当然，也可以在电源管理芯片 U101 的外部增加频率调整电路。 About the frequency adjustment of the PWM signal output to the MOS transistor Q101, the power management chip U101 can be used. Internal oscillator adjustment. Of course, it is also possible to add a frequency adjustment circuit to the outside of the power management chip U101.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的权利要求范围之内。 The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims (10)

  1. 一种电源供应器，包括驱动开关管，其特征在于，包括：A power supply device includes a drive switch tube, including:
    具有特定感量的变压器，且所述特定感量使所述变压器在额定负载时工作在断续电流模式或临界模式；a transformer having a specific amount of inductance, and the specific amount of inductance causes the transformer to operate in a discontinuous current mode or a critical mode at a rated load;
    电压电流控制环路，用于采样所述变压器的输出电压和输入电流，并在所述输出电压高于预设值时反馈采样电压，在所述输出电压不高于预设值时反馈采样电流；a voltage and current control loop for sampling an output voltage and an input current of the transformer, and feeding back a sampling voltage when the output voltage is higher than a preset value, and feeding back a sampling current when the output voltage is not higher than a preset value ;
    PWM 控制电路，用于根据采样电压或采样电流通过所述驱动开关管对所述变压器进行稳压调节，并在所述输出电压不高于预设值时，通过所述驱动开关管提升所述变压器的工作频率。PWM a control circuit for regulating the transformer through the driving switch tube according to the sampling voltage or the sampling current, and lifting the transformer through the driving switch tube when the output voltage is not higher than a preset value The working frequency.
  2. 根据权利要求 1 所述的电源供应器，其特征在于，所述电源供应器还包括：The power supply of claim 1, wherein the power supply further comprises:
    用于对所述变压器的第一次级绕组的输出电压进行整流的第一整流电路；及a first rectifying circuit for rectifying an output voltage of the first secondary winding of the transformer; and
    用于对经所述第一整流电路整流后的电压进行稳压的第一稳压电路。a first voltage stabilizing circuit for regulating a voltage rectified by the first rectifier circuit.
  3. 根据权利要求 2 所述的电源供应器，其特征在于，所述电压电流控制环路包括第一电阻、第二电阻（ R206 ）、第三电阻（ R101 ）、第四电阻（ R123 ）、第五电阻（ R204 ）、第六电阻（ R129 ）、第七电阻（ R126 ）、三端可调分流基准源（ U3 ）、光耦（ U201 ），其中，所述第一电阻和第二电阻（ R206 ）串联在所述第一稳压电路的输出端和地之间，所述第一电阻和第二电阻（ R206 ）的连接点连接所述三端可调分流基准源（ U3 ）的参考极，所述三端可调分流基准源（ U3 ）的阳极接地，三端可调分流基准源（ U3 ）的阴极连接所述光耦（ U201 ）的负输入端，所述光耦（ U201 ）的正输入端通过所述第五电阻（ R204 ）接所述第一整流电路的输出端；所述第三电阻（ R101 ）的第一端连接所述驱动开关管的第二端，所述驱动开关管的第一端连接所述变压器的初级绕组的同名端，所述驱动开关管的控制端连接所述 PWM 控制电路的输出端，所述第三电阻（ R101 ）的第二端接地，所述第三电阻（ R101 ）的第一端还通过所述第七电阻（ R126 ）和第六电阻（ R129 ）连接所述光耦（ U201 ）的负输出端，所述光耦（ U201 ）正输出端通过所述第四电阻（ R123 ）连接高电平；所述第七电阻（ R126 ）和第六电阻（ R129 ）的连接点连接所述 PWM 控制电路的电流检测端（ CS ）。The power supply according to claim 2, wherein said voltage current control loop comprises a first resistor, a second resistor (R206), and a third resistor ( R101), fourth resistor (R123), fifth resistor (R204), sixth resistor (R129), seventh resistor (R126), three-terminal adjustable shunt reference source (U3), optocoupler ( U201), wherein the first resistor and the second resistor (R206) are connected in series between the output end of the first voltage stabilizing circuit and the ground, the first resistor and the second resistor (R206) a connection point connecting the reference pole of the three-terminal adjustable shunt reference source (U3), the anode of the three-terminal adjustable shunt reference source (U3) is grounded, and the cathode connection of the three-terminal adjustable shunt reference source (U3) The optocoupler a negative input terminal of U201), a positive input end of the optocoupler (U201) is connected to an output end of the first rectifier circuit through the fifth resistor (R204); the third resistor (R101) The first end of the driving switch tube is connected to the second end of the driving switch tube, the first end of the driving switch tube is connected to the same end of the primary winding of the transformer, and the control end of the driving switch tube is connected to the PWM An output end of the control circuit, a second end of the third resistor (R101) is grounded, and a first end of the third resistor (R101) further passes through the seventh resistor (R126) and a sixth resistor (R129 Connecting a negative output terminal of the optocoupler (U201), the positive output terminal of the optocoupler (U201) is connected to a high level through the fourth resistor (R123); the seventh resistor (R126) and the sixth resistor ( The connection point of R129) is connected to the current detecting terminal (CS) of the PWM control circuit.
  4. 根据权利要求 3 所述的电源供应器，其特征在于，所述电压电流控制环路还包括稳压电容（ C111 ），所述稳压电容（ C111 ）的一端所述第七电阻（ R126 ）和第六电阻（ R129 ）的连接点，所述稳压电容（ C111 ）的另一端接地。The power supply according to claim 3, wherein said voltage current control loop further comprises a voltage stabilizing capacitor (C111), said voltage stabilizing capacitor ( A connection point of the seventh resistor (R126) and the sixth resistor (R129) at one end of C111), and the other end of the voltage stabilizing capacitor (C111) is grounded.
  5. 根据权利要求 1 所述的电源供应器，其特征在于，所述变压器还包括第二次级绕组；The power supply of claim 1 wherein said transformer further comprises a second secondary winding;
    所述电源供应器还包括：The power supply further includes:
    用于对所述第二次级绕组的电压进行整流的第二整流电路；及a second rectifier circuit for rectifying a voltage of the second secondary winding; and
    用于对经所述第二整流电路整流后的电压进行稳压的第二稳压电路，而且，所述第二稳压电路的输出端连接所述 PWM 控制电路的电源端。a second voltage stabilizing circuit for regulating a voltage rectified by the second rectifying circuit, and an output end of the second voltage stabilizing circuit is connected to the PWM The power supply terminal of the control circuit.
  6. 根据权利要求 5 所述的电源供应器，其特征在于，所述第二稳压电路的输出端还通过所述第四电阻（ R123 ）连接所述光耦（ U201 ）正输出端。The power supply according to claim 5, wherein the output of the second voltage stabilizing circuit is further connected to the optocoupler via the fourth resistor (R123) ( U201) Positive output.
  7. 根据权利要求 1 所述的电源供应器，其特征在于，所述电源供应器还包括：The power supply of claim 1, wherein the power supply further comprises:
    用于对交流输入电压进行 EMI 滤波的至少一个共模电感；At least one common mode inductor for EMI filtering the AC input voltage;
    用于对 EMI 滤波后的电压进行整流并为所述变压器提供直流电压的二极管整流桥。A diode rectifier bridge used to rectify the EMI filtered voltage and provide a DC voltage to the transformer.
  8. 根据权利要求 7 所述的电源供应器，其特征在于，所述电源供应器还包括：The power supply according to claim 7, wherein the power supply further comprises:
    用于对 EMI 滤波后的电压进行整流的第三整流电路，而且，所述第三整流电路的输出端连接所述 PWM 控制电路的启动端。a third rectifying circuit for rectifying the EMI filtered voltage, and wherein an output of the third rectifying circuit is connected to the PWM The starting end of the control circuit.
  9. 根据权利要求 2 所述的电源供应器，其特征在于，所述电源供应器还包括：The power supply of claim 2, wherein the power supply further comprises:
    连接在所述第一稳压电路后的差模电感。A differential mode inductance connected after the first voltage stabilizing circuit.
  10. 根据权利要求 7 所述的电源供应器，其特征在于，所述电源供应器还包括：The power supply according to claim 7, wherein the power supply further comprises:
    连接在所述共模电感前的保险丝。A fuse connected to the common mode inductor.
PCT/CN2014/081654 2014-07-04 2014-07-04 Power supply WO2016000259A1 (en)

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CN106100322A (en) * 2016-06-23 2016-11-09 新天科技股份有限公司 A kind of duplex high precision power circuit
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CN111122961A (en) * 2020-01-18 2020-05-08 宁波奥克斯电气股份有限公司 Current sampling circuit and fan driving system
CN112235896A (en) * 2020-09-10 2021-01-15 深圳市崧盛电子股份有限公司 Circuit for automatically adjusting output current by low-voltage input and driving power supply
CN112235896B (en) * 2020-09-10 2023-04-18 深圳市崧盛电子股份有限公司 Circuit for automatically adjusting output current by low-voltage input and driving power supply

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