CN114499169A - A control module for synchronous rectification circuit to reduce no-load power consumption - Google Patents
A control module for synchronous rectification circuit to reduce no-load power consumptionDownload PDFInfo
- Publication number
- CN114499169A CN114499169ACN202111654676.9ACN202111654676ACN114499169ACN 114499169 ACN114499169 ACN 114499169ACN 202111654676 ACN202111654676 ACN 202111654676ACN 114499169 ACN114499169 ACN 114499169A
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- module
- capacitor
- synchronous rectification
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 230000001360synchronised effectEffects0.000titleclaimsabstractdescription46
- 238000001514detection methodMethods0.000claimsabstractdescription33
- 230000003321amplificationEffects0.000claimsabstractdescription16
- 238000003199nucleic acid amplification methodMethods0.000claimsabstractdescription16
- 239000003990capacitorSubstances0.000claimsdescription60
- 238000001914filtrationMethods0.000claimsdescription12
- 238000010586diagramMethods0.000description4
- 238000004146energy storageMethods0.000description4
- 238000006243chemical reactionMethods0.000description2
- 230000008878couplingEffects0.000description2
- 238000010168coupling processMethods0.000description2
- 238000005859coupling reactionMethods0.000description2
- 230000002093peripheral effectEffects0.000description2
- 230000009286beneficial effectEffects0.000description1
- 238000000034methodMethods0.000description1
Images
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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Translated fromChinese技术领域technical field
本发明涉及整流电路控制技术领域，更具体的是涉及用于同步整流电路降低空载功耗的控制模块技术领域。The present invention relates to the technical field of rectification circuit control, and more particularly to the technical field of control modules used for synchronous rectification circuits to reduce no-load power consumption.
背景技术Background technique
在同步整流电路的应用中，16-40V宽范围电压输入时，传统电源模块空载电流和增加的外围电路相比，在40V输入时比16V输入时大几十到一百毫安的电流。In the application of the synchronous rectifier circuit, when the 16-40V wide-range voltage is input, the no-load current of the traditional power module is tens to 100 mA larger than the 16V input when the 40V input is compared with the added peripheral circuit.
在轻载或空载模式下，电源模块占空比小，储能电感波形不连续，当同步整流电路打开时，输出电容会对储能电感产生反向励磁。此时，储能电感出现反向电流，导致轻载或空载的电流较大。In light-load or no-load mode, the power module has a small duty cycle, and the energy storage inductor waveform is discontinuous. When the synchronous rectifier circuit is turned on, the output capacitor will reversely excite the energy storage inductor. At this time, a reverse current occurs in the energy storage inductor, resulting in a large current at light load or no load.
为了解决空载功耗的问题，需要确保负载达到储能电感波形连续后，才开启同步整流管，以减小轻载或空载时的电流，同时可降低磁芯在空载时的温升。In order to solve the problem of no-load power consumption, it is necessary to ensure that the load reaches the continuous waveform of the energy storage inductance before turning on the synchronous rectifier tube to reduce the current at light load or no-load, and at the same time reduce the temperature rise of the magnetic core at no-load .
发明内容SUMMARY OF THE INVENTION
本发明的目的在于：解决同步整流电路空载时功耗大的问题。为了解决上述技术问题，本发明提供一种用于同步整流电路降低空载功耗的控制模块。The purpose of the present invention is to solve the problem of large power consumption when the synchronous rectifier circuit has no load. In order to solve the above technical problems, the present invention provides a control module for reducing no-load power consumption in a synchronous rectifier circuit.
本发明为了实现上述目的具体采用以下技术方案：The present invention specifically adopts the following technical solutions in order to achieve the above object:
一种用于同步整流电路降低空载功耗的控制模块，包括依次连接的电流检测模块、电压放大模块、电压比较模块和控制模块，用于控制同步整流电路的同步整流信号；A control module for reducing no-load power consumption of a synchronous rectification circuit, comprising a current detection module, a voltage amplification module, a voltage comparison module and a control module connected in sequence, for controlling the synchronous rectification signal of the synchronous rectification circuit;
所述电流检测电路用于检测所述同步整流电路的主回路电流，将其转化为电压V1，并将电压V1输出到所述电压放大模块的输入端；The current detection circuit is used to detect the main loop current of the synchronous rectification circuit, convert it into a voltage V1, and output the voltage V1 to the input end of the voltage amplification module;
所述电压放大模块用于将电压V1进行线性放大为电压V2，并将电压V2输出到电压比较模块的输入端；The voltage amplifying module is used to linearly amplify the voltage V1 into a voltage V2, and output the voltage V2 to the input end of the voltage comparison module;
所述电压比较模块用于比较输出电压V2和参考电压，比较结果作为控制信号输出到控制模块，控制模块根据控制信号控制所述同步整流电路中的同步整流信号的通断，参考电压由参考电压源产生。The voltage comparison module is used to compare the output voltage V2 and the reference voltage, and the comparison result is output to the control module as a control signal. The control module controls the on-off of the synchronous rectification signal in the synchronous rectification circuit according to the control signal, and the reference voltage is determined by the reference voltage. source produced.
优选地，所述电流检测模块包括第一分压模块、第三电阻、检测电阻、第一电容、第二电容、第一运算放大器、第一滤波模块和第二滤波模块；。Preferably, the current detection module includes a first voltage dividing module, a third resistor, a detection resistor, a first capacitor, a second capacitor, a first operational amplifier, a first filter module and a second filter module;
检测电阻的一端连接到所述同步整流电路的主回路的检测点和第三电阻的一端，检测电阻的另一端接地；第三电阻的另一端连接到第一滤波模块的输入端、第一电容的一端和第一运算放大器的IN-端，第一电容的另一端连接到第一分压模块的中间分压点和第一运算放大器的IN+端，第一分压模块的一端接地，另一端连接到参考电压源；第一运算放大器的V+端接参考电压源，V-端接地，输出端连接到第二滤波模块的输入端；所述参考电压源和接地端之间连接第二电容；One end of the detection resistor is connected to the detection point of the main loop of the synchronous rectifier circuit and one end of the third resistor, and the other end of the detection resistor is grounded; the other end of the third resistor is connected to the input end of the first filter module, the first capacitor One end of the first operational amplifier and the IN- end of the first operational amplifier, the other end of the first capacitor is connected to the middle voltage dividing point of the first voltage dividing module and the IN+ end of the first operational amplifier, one end of the first voltage dividing module is grounded, and the other end connected to the reference voltage source; the V+ terminal of the first operational amplifier is connected to the reference voltage source, the V- terminal is grounded, and the output terminal is connected to the input terminal of the second filter module; a second capacitor is connected between the reference voltage source and the ground terminal;
所述第一滤波模块的输出端输出所述电压V1，所述第二滤波模块的输出端连接到所述控制模块的CS端。The output terminal of the first filtering module outputs the voltage V1, and the output terminal of the second filtering module is connected to the CS terminal of the control module.
优选地，所述第一分压模块包括第一电阻和第二电阻；Preferably, the first voltage dividing module includes a first resistor and a second resistor;
第一电阻的一端接地，另一端连接到第二电阻的一端，第二电阻的另一端连接到参考电压源；第一电阻和第二电阻相连的节点作为所述中间分压点。One end of the first resistor is grounded, the other end is connected to one end of the second resistor, and the other end of the second resistor is connected to the reference voltage source; the node connecting the first resistor and the second resistor serves as the intermediate voltage dividing point.
优选地，所述第一滤波模块包括第四电阻和第三电容，第四电阻和第三电容并联，其并联的一端作为第一滤波模块的输入端，另一端为输出端。Preferably, the first filter module includes a fourth resistor and a third capacitor, the fourth resistor and the third capacitor are connected in parallel, and one end of the parallel connection is used as the input end of the first filter module, and the other end is the output end.
优选地，所述第二滤波模块包括第五电阻和第四电容；Preferably, the second filter module includes a fifth resistor and a fourth capacitor;
第五电阻的一端连接到所述第一运算放大器的输出端，第五电阻的另一端连接到第四电容的一端，第四电容的另一端接地，第五电阻和第四电容的共同端为所述第二滤波模块的输出端。One end of the fifth resistor is connected to the output end of the first operational amplifier, the other end of the fifth resistor is connected to one end of the fourth capacitor, the other end of the fourth capacitor is grounded, and the common end of the fifth resistor and the fourth capacitor is the output end of the second filtering module.
优选地，所述电压放大模块包括第六电阻、第七电阻、第八电阻、第二运算放大器、二极管和第五电容；Preferably, the voltage amplification module includes a sixth resistor, a seventh resistor, an eighth resistor, a second operational amplifier, a diode and a fifth capacitor;
第六电阻的一端连接到所述电流检测电路的输出端，另一端连接到第二运算放大器的IN+端；第七电阻的一端接地，另一个连接到第八电阻的一端和第二运算放大器的IN-端，第二运算放大器的输出端连接到第八电阻的另一端和二极管的阳极，二极管的阴极为所述电压放大模块的输出端；第二运算放大器的V+端接直流源，V-端接地，V+端和V-端之间连接第五电容。One end of the sixth resistor is connected to the output end of the current detection circuit, and the other end is connected to the IN+ end of the second operational amplifier; one end of the seventh resistor is grounded, and the other end is connected to one end of the eighth resistor and the second operational amplifier. IN- terminal, the output terminal of the second operational amplifier is connected to the other end of the eighth resistor and the anode of the diode, and the cathode of the diode is the output terminal of the voltage amplifying module; the V+ terminal of the second operational amplifier is connected to the DC source, V- The terminal is grounded, and a fifth capacitor is connected between the V+ terminal and the V- terminal.
优选地，所述电压比较模块包括第九电阻、第十电阻、比较器、开关管；Preferably, the voltage comparison module includes a ninth resistor, a tenth resistor, a comparator, and a switch tube;
比较器的反向输入端经第九电阻连接所述所述电压放大模块的输出端，同向输入端经第十电阻连接所述参考电压源，V+端接直流源，V-端接地，输出端连接到开关管的被控端，开关管的输入端接地，输出端输出所述控制信号。The inverting input terminal of the comparator is connected to the output terminal of the voltage amplifying module through the ninth resistor, the non-inverting input terminal is connected to the reference voltage source through the tenth resistor, the V+ terminal is connected to the DC source, the V- terminal is grounded, and the output The terminal is connected to the controlled terminal of the switch tube, the input terminal of the switch tube is grounded, and the output terminal outputs the control signal.
优选地，所述开关管采用NMOS管。Preferably, the switch tube is an NMOS tube.
本发明的有益效果如下：The beneficial effects of the present invention are as follows:
本发明降低了同步整流电路的功耗，在空载时的工作电流降低了100mA以上；提供了简单而有效的控制电路去控制同步整流电路的关闭或开启，降低轻载或空载时的反向电流，易于实施；对主路进行电流检测、电压转化和放大，使得数值更容易处理，判断结构更精确。The invention reduces the power consumption of the synchronous rectification circuit, and the working current at no-load is reduced by more than 100mA; a simple and effective control circuit is provided to control the closing or opening of the synchronous rectification circuit, and the reaction at light load or no-load is reduced. It is easy to implement; current detection, voltage conversion and amplification are performed on the main circuit, which makes the numerical value easier to handle and the judgment structure is more accurate.
附图说明Description of drawings
图1是本发明的原理示意图；Fig. 1 is the principle schematic diagram of the present invention;
图2是实施例1的电流检测模块的电路示意图；；2 is a schematic circuit diagram of the current detection module of Embodiment 1;
图3是实施例2的电压放大模块的电路示意图；3 is a schematic circuit diagram of the voltage amplification module of
图4是实施例3的电压比较模块的电路示意图。FIG. 4 is a schematic circuit diagram of the voltage comparison module of the third embodiment.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.
因此，以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围，而是仅仅表示本发明的选定实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
实施例1Example 1
本实施例基于同步整流电路基础上，增加外围控制电路，实现同步整流电路空载功耗的降低。This embodiment is based on the synchronous rectification circuit and adds a peripheral control circuit to reduce the no-load power consumption of the synchronous rectification circuit.
如图1所示，本实施例提供一种用于同步整流电路降低空载功耗的控制模块，包括依次连接的电流检测模块、电压放大模块、电压比较模块和控制模块，用于控制同步整流电路的同步整流信号；As shown in FIG. 1 , this embodiment provides a control module for reducing no-load power consumption of a synchronous rectification circuit, including a current detection module, a voltage amplification module, a voltage comparison module and a control module connected in sequence, for controlling the synchronous rectification The synchronous rectification signal of the circuit;
所述电流检测电路用于检测所述同步整流电路的主回路电流，将其转化为电压V1，并将电压V1输出到所述电压放大模块的输入端；The current detection circuit is used to detect the main loop current of the synchronous rectification circuit, convert it into a voltage V1, and output the voltage V1 to the input end of the voltage amplification module;
所述电压放大模块用于将电压V1进行线性放大为电压V2，并将电压V2输出到电压比较模块的输入端；The voltage amplifying module is used to linearly amplify the voltage V1 into a voltage V2, and output the voltage V2 to the input end of the voltage comparison module;
所述电压比较模块用于比较输出电压V2和参考电压，比较结果作为控制信号输出到控制模块，控制模块根据控制信号控制所述同步整流电路中的同步整流信号的通断，参考电压由参考电压源产生。The voltage comparison module is used to compare the output voltage V2 and the reference voltage, and the comparison result is output to the control module as a control signal. The control module controls the on-off of the synchronous rectification signal in the synchronous rectification circuit according to the control signal, and the reference voltage is determined by the reference voltage. source produced.
参阅图2，本实施例中所述电流检测模块包括第一分压模块、第三电阻R3、检测电阻Rtest、第一电容C1、第二电容C2、第一运算放大器U1、第一滤波模块和第二滤波模块；。Referring to FIG. 2, the current detection module in this embodiment includes a first voltage divider module, a third resistor R3, a detection resistor Rtest, a first capacitor C1, a second capacitor C2, a first operational amplifier U1, a first filter module and The second filter module; .
检测电阻Rtest的一端连接到所述同步整流电路的主回路的检测点和第三电阻R3的一端，检测电阻Rtest的另一端接地；第三电阻R3的另一端连接到第一滤波模块的输入端、第一电容C1的一端和第一运算放大器U1的IN-端，第一电容C1的另一端连接到第一分压模块的中间分压点和第一运算放大器U1的IN+端，第一分压模块的一端接地，另一端连接到参考电压源；第一运算放大器U1的V+端接参考电压源，V-端接地，输出端连接到第二滤波模块的输入端；所述参考电压源和接地端之间连接第二电容C2；One end of the detection resistor Rtest is connected to the detection point of the main loop of the synchronous rectifier circuit and one end of the third resistor R3, the other end of the detection resistor Rtest is grounded; the other end of the third resistor R3 is connected to the input end of the first filter module , one end of the first capacitor C1 and the IN- end of the first operational amplifier U1, the other end of the first capacitor C1 is connected to the middle voltage dividing point of the first voltage divider module and the IN+ end of the first operational amplifier U1, the first divider One end of the voltage module is grounded, and the other end is connected to the reference voltage source; the V+ end of the first operational amplifier U1 is connected to the reference voltage source, the V- end is grounded, and the output end is connected to the input end of the second filter module; the reference voltage source and A second capacitor C2 is connected between the ground terminals;
所述第一滤波模块的输出端输出所述电压V1，所述第二滤波模块的输出端连接到所述控制模块的CS端。The output terminal of the first filtering module outputs the voltage V1, and the output terminal of the second filtering module is connected to the CS terminal of the control module.
其中，作为优选方案，所述第一分压模块包括第一电阻R1和第二电阻R2；Wherein, as a preferred solution, the first voltage dividing module includes a first resistor R1 and a second resistor R2;
第一电阻R1的一端接地，另一端连接到第二电阻R2的一端，第二电阻R2的另一端连接到参考电压源；第一电阻R1和第二电阻R2相连的节点作为所述中间分压点；所述第一滤波模块包括第四电阻R4和第三电容C3，第四电阻R4和第三电容C3并联，其并联的一端作为第一滤波模块的输入端，另一端为输出端；，所述第二滤波模块包括第五电阻R5和第四电容C4；第五电阻R5的一端连接到所述第一运算放大器U1的输出端，第五电阻R5的另一端连接到第四电容C4的一端，第四电容C4的另一端接地，第五电阻R5和第四电容C4的共同端为所述第二滤波模块的输出端。One end of the first resistor R1 is grounded, the other end is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the reference voltage source; the node connecting the first resistor R1 and the second resistor R2 serves as the intermediate voltage divider point; the first filter module includes a fourth resistor R4 and a third capacitor C3, the fourth resistor R4 and the third capacitor C3 are connected in parallel, and one end of the parallel connection is used as the input end of the first filter module, and the other end is the output end; The second filter module includes a fifth resistor R5 and a fourth capacitor C4; one end of the fifth resistor R5 is connected to the output end of the first operational amplifier U1, and the other end of the fifth resistor R5 is connected to the fourth capacitor C4. One end, the other end of the fourth capacitor C4 is grounded, and the common end of the fifth resistor R5 and the fourth capacitor C4 is the output end of the second filter module.
电流检测模块的工作原理为：The working principle of the current detection module is as follows:
检测电阻Rtest接入同步整流电路的主回路的一个检测点用于检测主回路的电流并通过接地的检测电阻得到一个检测电压，第一电阻R1和第二电阻R2为第一运算放大器U1分压；第一滤波模块和第一电容C1均用于减小噪声，第二滤波模块用于减小第一运算放大器U1的输出端的输出到控制模块的CS端的电流的尖峰毛刺，电流输出到控制模块的CS端的目的是限流，如果输出的电压V1超过控制模块CS端的电压，电路会处于保护状态；第二电容C2作为旁路电容减小参考电压源的耦合噪声。The detection resistor Rtest is connected to a detection point of the main circuit of the synchronous rectifier circuit to detect the current of the main circuit and obtain a detection voltage through the grounded detection resistor. The first resistor R1 and the second resistor R2 divide the voltage of the first operational amplifier U1 The first filter module and the first capacitor C1 are both used to reduce noise, and the second filter module is used to reduce the peak burr of the current output from the output end of the first operational amplifier U1 to the CS end of the control module, and the current is output to the control module. The purpose of the CS terminal is to limit the current. If the output voltage V1 exceeds the voltage of the CS terminal of the control module, the circuit will be in a protection state; the second capacitor C2 is used as a bypass capacitor to reduce the coupling noise of the reference voltage source.
该模块输出转化后的电压V1到后续的电压放大模块，根据运放的虚短原理，REF为参考电压，输出端的电压V1为：This module outputs the converted voltage V1 to the subsequent voltage amplification module. According to the virtual short principle of the operational amplifier, REF is the reference voltage, and the voltage V1 at the output terminal is:
实施例2Example 2
本实施例基于实施例1的技术方案，参阅图3在本实施例中所述电压放大模块包括第六电阻R6、第七电阻R7、第八电阻R8、第二运算放大器U2、二极管D1和第五电容C5；This embodiment is based on the technical solution of Embodiment 1. Referring to FIG. 3 , the voltage amplifying module in this embodiment includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second operational amplifier U2, a diode D1, and a third resistor R6. Five capacitors C5;
第六电阻R6的一端连接到所述电流检测电路的输出端，另一端连接到第二运算放大器U2的IN+端；第七电阻R7的一端接地，另一个连接到第八电阻R8的一端和第二运算放大器U2的IN-端，第二运算放大器U2的输出端连接到第八电阻R8的另一端和二极管D1的阳极，二极管D1的阴极为所述电压放大模块的输出端；第二运算放大器U2的V+端接直流源，V-端接地，V+端和V-端之间连接第五电容C5。One end of the sixth resistor R6 is connected to the output end of the current detection circuit, and the other end is connected to the IN+ end of the second operational amplifier U2; one end of the seventh resistor R7 is grounded, and the other end is connected to one end of the eighth resistor R8 and the first The IN- terminal of the second operational amplifier U2, the output terminal of the second operational amplifier U2 is connected to the other end of the eighth resistor R8 and the anode of the diode D1, and the cathode of the diode D1 is the output terminal of the voltage amplifying module; the second operational amplifier The V+ terminal of U2 is connected to the DC source, the V- terminal is grounded, and the fifth capacitor C5 is connected between the V+ terminal and the V- terminal.
电压放大模块的工作原理为：The working principle of the voltage amplifier module is as follows:
第五电容C5作为旁路电容减少电压V1的耦合噪声，二极管D1抑制倒流，具体是防止后级的电压比较模块造成的电压倒灌回第一运算放大器U1和第二运算放大器U2，在本模块中，电压V1经过第二运算放大器U2放大为电压V2：The fifth capacitor C5 acts as a bypass capacitor to reduce the coupling noise of the voltage V1, and the diode D1 suppresses the reverse current, specifically to prevent the voltage caused by the voltage comparison module of the subsequent stage from flowing back into the first operational amplifier U1 and the second operational amplifier U2. In this module , the voltage V1 is amplified to the voltage V2 by the second operational amplifier U2:
实施例3Example 3
本实施例基于实施例1或实施例2的技术方案，参阅图2，在本实施例中所述电压比较模块包括第九电阻R9、第十电阻R10、比较器U3、开关管Q1；This embodiment is based on the technical solution of Embodiment 1 or
比较器U3的反向输入端经第九电阻R9连接所述所述电压放大模块的输出端，同向输入端经第十电阻R10连接所述参考电压源，V+端接直流源，V-端接地，输出端连接到开关管Q1的被控端，开关管Q1的输入端接地，输出端输出所述控制信号。The inverting input terminal of the comparator U3 is connected to the output terminal of the voltage amplification module through the ninth resistor R9, the non-inverting input terminal is connected to the reference voltage source through the tenth resistor R10, the V+ terminal is connected to the DC source, and the V- terminal is connected to the reference voltage source. Grounding, the output end is connected to the controlled end of the switch tube Q1, the input end of the switch tube Q1 is grounded, and the output end outputs the control signal.
具体而言，本实施例的电压比较模块还包括第十一电阻R11、第十二电阻R12、第十三电阻R13、第十四电阻R14、第十五电阻R15、第六电容C6、第七电容C7和第八电容C8；Specifically, the voltage comparison module of this embodiment further includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixth capacitor C6, and a seventh resistor R14. Capacitor C7 and eighth capacitor C8;
所述第十一电阻R11的一端和第六电容C6的一端均连接到比较器U3的反向输入端，第十一电阻R11的另一端和第六电容C6的一端均接地；所述第十二电阻R12的一端和第七电容C7的一端均连接到比较器U3的同向输入端，第十二电阻R12的另一端和第七电容C7的一端均接地，比较器U3的V+和V-端之间连接第八电容C8；比较器U3的同向输入端还连接第十三电阻R13的一端，第十三电阻R13的另一端连接到第十四电阻R14的一端，第十四电阻R14的另一端接直流源，第十三电阻R13和第十四电阻R14的中间节点连接到开关管Q1的被控端，开关管Q1的被控端还连接第十五电阻R15的一端，第十五电阻R15的另一端接地，直流源和接地端之间接有第八电容C8。One end of the eleventh resistor R11 and one end of the sixth capacitor C6 are both connected to the reverse input end of the comparator U3, and the other end of the eleventh resistor R11 and one end of the sixth capacitor C6 are both grounded; One end of the second resistor R12 and one end of the seventh capacitor C7 are both connected to the non-inverting input end of the comparator U3, the other end of the twelfth resistor R12 and one end of the seventh capacitor C7 are both grounded, and the V+ and V- of the comparator U3 The eighth capacitor C8 is connected between the terminals; the non-inverting input terminal of the comparator U3 is also connected to one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14, and the fourteenth resistor R14 The other end is connected to the DC source, the intermediate node of the thirteenth resistor R13 and the fourteenth resistor R14 is connected to the controlled end of the switch tube Q1, and the controlled end of the switch tube Q1 is also connected to one end of the fifteenth resistor R15, the tenth The other end of the five resistors R15 is grounded, and an eighth capacitor C8 is connected between the DC source and the ground.
电压比较模块的工作原理如下：The working principle of the voltage comparison module is as follows:
比较器U3的同向输入端经过R10和R12分压后的电压为，反向输入端经过R9和R11分压后的电压为The voltage of the non-inverting input terminal of the comparator U3 after being divided by R10 and R12 is
第六电容C6和第七电容C7用于做时序差，第六电容C6的值需小于第七电容C7，第八电容C8作为旁路电容，实现将干扰接地。第十三电阻R13作为反馈到同相输入端，第十五电阻R15作为泄放电阻，第十四电阻R14作为上拉电阻，将比较器U3的输出端钳位在高电平。The sixth capacitor C6 and the seventh capacitor C7 are used for timing difference, the value of the sixth capacitor C6 needs to be smaller than the seventh capacitor C7, and the eighth capacitor C8 is used as a bypass capacitor to ground the interference. The thirteenth resistor R13 is used as feedback to the non-inverting input terminal, the fifteenth resistor R15 is used as a bleeder resistor, and the fourteenth resistor R14 is used as a pull-up resistor to clamp the output terminal of the comparator U3 to a high level.
当反相输入端的电压低于同相输入端的电压时，即V2小于REF，比较器U3输出高电平，使得开关管Q1导通，此时开关管Q1的输出端被相当于接地，即SSSR端为低电平，使得控制模块控制同步整流信号关闭，以此降低静态电流实现降低功耗；当反相输入端的电压大于同相输入端的电压时，即V2大于REF，比较器U3输出低电平，开关管Q1截止，而控制模块的SSSR管脚默认高电平，控制模块控制同步整流信号开启，控制模块可以采用的型号为LM5045。When the voltage of the inverting input terminal is lower than the voltage of the non-inverting input terminal, that is, V2 is less than REF, the comparator U3 outputs a high level, so that the switch Q1 is turned on. At this time, the output terminal of the switch Q1 is equivalent to grounding, that is, the SSSR terminal It is low level, so that the control module controls the synchronous rectification signal to turn off, thereby reducing the quiescent current and reducing power consumption; when the voltage of the inverting input terminal is greater than the voltage of the non-inverting input terminal, that is, V2 is greater than REF, the comparator U3 outputs a low level, The switch tube Q1 is turned off, and the SSSR pin of the control module defaults to a high level. The control module controls the synchronous rectification signal to turn on. The model that the control module can use is LM5045.
作为优选方案，直流源为12V，参考电压源为5V。As a preferred solution, the DC source is 12V, and the reference voltage source is 5V.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654676.9ACN114499169A (en) | 2021-12-30 | 2021-12-30 | A control module for synchronous rectification circuit to reduce no-load power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111654676.9ACN114499169A (en) | 2021-12-30 | 2021-12-30 | A control module for synchronous rectification circuit to reduce no-load power consumption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114499169Atrue CN114499169A (en) | 2022-05-13 |
Family
ID=81497314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111654676.9APendingCN114499169A (en) | 2021-12-30 | 2021-12-30 | A control module for synchronous rectification circuit to reduce no-load power consumption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114499169A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119253815A (en)* | 2024-12-09 | 2025-01-03 | 深圳市德兰明海新能源股份有限公司 | Energy storage power supply, energy storage power supply control method and computer equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996730A (en)* | 2006-12-27 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | High-efficiency synchronous rectification buck-type switch converter |
| CN104767379A (en)* | 2015-04-10 | 2015-07-08 | 广州润芯信息技术有限公司 | Buck direct-current converter |
| CN205178887U (en)* | 2015-12-15 | 2016-04-20 | 深圳优博聚能科技有限公司 | Power supply circuit with L6599 controller |
| CN206086398U (en)* | 2016-10-10 | 2017-04-12 | 湖大科瑞（江苏）检测技术有限公司 | Two -wheeled self -balancing electric motor car current foldback circuit |
| CN107192872A (en)* | 2017-07-06 | 2017-09-22 | 苏州未来电器股份有限公司 | A kind of external breaker of load current detection circuit and electric energy meter |
| CN108667306A (en)* | 2018-05-17 | 2018-10-16 | 中国科学院电工研究所 | A synchronous rectification circuit and method |
| CN111030468A (en)* | 2019-12-26 | 2020-04-17 | 广州金升阳科技有限公司 | Control method and control circuit of clamping switch power supply |
- 2021
- 2021-12-30CNCN202111654676.9Apatent/CN114499169A/enactivePending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996730A (en)* | 2006-12-27 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | High-efficiency synchronous rectification buck-type switch converter |
| CN104767379A (en)* | 2015-04-10 | 2015-07-08 | 广州润芯信息技术有限公司 | Buck direct-current converter |
| CN205178887U (en)* | 2015-12-15 | 2016-04-20 | 深圳优博聚能科技有限公司 | Power supply circuit with L6599 controller |
| CN206086398U (en)* | 2016-10-10 | 2017-04-12 | 湖大科瑞（江苏）检测技术有限公司 | Two -wheeled self -balancing electric motor car current foldback circuit |
| CN107192872A (en)* | 2017-07-06 | 2017-09-22 | 苏州未来电器股份有限公司 | A kind of external breaker of load current detection circuit and electric energy meter |
| CN108667306A (en)* | 2018-05-17 | 2018-10-16 | 中国科学院电工研究所 | A synchronous rectification circuit and method |
| CN111030468A (en)* | 2019-12-26 | 2020-04-17 | 广州金升阳科技有限公司 | Control method and control circuit of clamping switch power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119253815A (en)* | 2024-12-09 | 2025-01-03 | 深圳市德兰明海新能源股份有限公司 | Energy storage power supply, energy storage power supply control method and computer equipment |
| CN119253815B (en)* | 2024-12-09 | 2025-08-15 | 深圳市德兰明海新能源股份有限公司 | Energy storage power supply, control method of energy storage power supply and computer equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207869008U (en) | Interleaved parallel PFC power supply | |
| CN209419485U (en) | Booster system response speed translation circuit based on PFM control | |
| CN113098267A (en) | Switch converter, switch integrated circuit and control circuit thereof | |
| CN207241434U (en) | Display instrument and automobile for automobile | |
| CN201167241Y (en) | A positive and negative pulse charge and discharge circuit controlled by an intelligent charger | |
| CN114499169A (en) | A control module for synchronous rectification circuit to reduce no-load power consumption | |
| CN217063266U (en) | Current backflow prevention circuit applied to battery detection equipment | |
| CN208316290U (en) | A kind of current foldback circuit | |
| CN113258771B (en) | Control circuit and power chip | |
| CN203206529U (en) | A LED driving circuit sampling inductive current in a complete period | |
| CN102299629A (en) | Power supply control method and power supply device for direct-current high-voltage power supply | |
| CN201789416U (en) | Point-of-load converter frequency conversion circuit | |
| CN1116731C (en) | Method and device for suppressing ripples for high-power DC power supply | |
| CN209992559U (en) | Current and frequency sampling circuit for automatic power supply conversion system | |
| CN209282906U (en) | Power circuit and electrical equipment | |
| CN101425754A (en) | Method and controller for controlling output current of switch electric power | |
| CN219498993U (en) | Charging circuit and device of battery | |
| CN111431388A (en) | Control device capable of improving transient performance of variable-frequency ripple control | |
| CN114710040B (en) | A magnetic saturation control system for small power transformers | |
| CN112234951A (en) | Common mode active EMI filter | |
| CN212305142U (en) | Nano-level boost circuit | |
| CN205546045U (en) | A 120-347VAC wide input voltage range LED constant current drive power supply | |
| CN210807200U (en) | Common mode active EMI filter | |
| CN111812375B (en) | A current and frequency sampling circuit for automatic power conversion system | |
| JP2572467Y2 (en) | Boost chopper circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |