CN202374173U

CN202374173U - Switching power supply surge limiting module and switching power supply

Info

Publication number: CN202374173U
Application number: CN2011204750155U
Authority: CN
Inventors: 陈玉鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-25
Filing date: 2011-11-25
Publication date: 2012-08-08
Anticipated expiration: 2021-11-25

Abstract

The utility model discloses a switching power supply surge limiting module. The surge limiting module comprises a thermistor (R16), a capacitor (C1), a controllable reference (Q2) and a control-level delay circuit, wherein the control-level delay circuit comprises controllable silicon (Q1), a resistor (R1), a resistor (R2), a resistor (R3), a resistor (R4), a resistor (R5), a resistor (R6), a resistor (R10), a resistor (R11), a capacitor (C3), a capacitor (C4), a capacitor (C5), a capacitor (C6), a capacitor (C7) and a diode (D2). The surge limiting module not only avoids defects of an original circuit but also has an improved structure that the original insertion mode is replaced with the present bonding mode, has high integration level, and is more convenient, quick and flexible to use.

Description

Switching Power Supply limit surge module and Switching Power Supply

Technical field

The utility model relates to a kind of Switching Power Supply limit surge module and Switching Power Supply, belongs to the switch power technology field.

Background technology

Along with development of modern industry, the application of Switching Power Supply more and more widely is accompanied by the required precision of control appliance, and is also increasingly high to the requirement of Switching Power Supply.The characteristics of Switching Power Supply have been saved Industrial Frequency Transformer exactly, make the more and more littler of volume change.But brought a shortcoming, civil power has caused the impact to electrical network without the direct rectifying and wave-filtering of Industrial Frequency Transformer.Switching Power Supply prime filter capacitor generally all is that 400V is withstand voltage, and the high pressure after the rectification directly charges moment to electric capacity, and electric capacity is equivalent to short circuit, and the energy of transient absorption is very big.If do not add the surge braking measure, the consequence that causes is powered on moment prime fuse or air switch tripping operation, and more serious meeting burns out the prime power supply unit.

Existing Switching Power Supply the inside all is added with the surge braking measure, but defectiveness all, and the measure of existing limit surge has following several kinds:

1), between filter capacitor and rectifier bridge or before the rectifier bridge, adds the thermistor of negative temperature coefficient, powered on moment; The thermistor resistance is very big, and probably about 10 ohm, the electric current that has limited the electric capacity charging is about tens amperes; Suppressed the impact of surge current, after NTC has worked a period of time, because the accumulation of heat to prime equipment; It is very little that resistance becomes, and reduced overall power.Directly use thermistor NTC, because the restriction of NTC self, through-current capacity is not very big, and this limit surge mode can only be used on the small-power switching power-supply.Particularly defective is more outstanding in the application of military products power supply, if having only NTC, what resistance can become during low temperature is very big, and power supply occurs easily importing and low draws inclined to one side the time work undesired in this case, has more reduced the efficient of power supply.

1) the basis on, at the resistance two ends and a controllable silicon, the silicon controlled trigger end is controlled by a back level Switching Power Supply, after Switching Power Supply starts, controllable silicon conducting work.Resistance only works starting moment.Because output settling time is shorter than charge used time of input filter capacitor, cause when input filter capacitor when also underfill is electric, controllable silicon is conducting, the direct conducting of controllable silicon causes too early ineffective of NTC, can cause the appearance of secondary surge current like this.

2) the basis on, change NTC into common cement resistor.Change NTC into cement resistor, because cement resistor does not have the negative temperature characteristic of NTC, the appearance that can slow down the secondary surge current a little; But can not fundamentally eliminate; And the volume ratio NTC of cement resistor wants big many, not only increased the volume of Switching Power Supply, and installed inconvenience.

The utility model content

The utility model technical problem to be solved is that the deficiency that is directed against prior art provides a kind of Switching Power Supply limit surge module and Switching Power Supply.

A kind of Switching Power Supply limit surge module comprises thermistor (R16), electric capacity (C1), controlled benchmark (Q2) and controlled stage delay circuit; The controlled stage delay circuit comprises controllable silicon (Q1), resistance (R1), resistance (R2), resistance (R3), resistance (R4), resistance (R5), resistance (R6), resistance (R10), resistance (R11), electric capacity (C3), electric capacity (C4), electric capacity (C5), electric capacity (C6), electric capacity (C7), diode (D2); The reference utmost point of TL431 aligns receives (R3), (R4); Arrive ground through (R1), (R2); Anode is directly received ground; Negative electrode is just received through resistance (R5), resistance (R6), resistance (R10), resistance (R11); Resistance (R5), resistance (R6), resistance (R10), resistance (R11) resistance equate, resistance (R5), resistance (R6) parallel connection, resistance (R10), resistance (R11) parallel connection, the series connection of parallel connection back.

A kind of Switching Power Supply comprises described Switching Power Supply limit surge module.

The utility model has not only improved the defective of original circuit from circuit, a structurally also more progressive step, change present mounting into from original plug-in mounting, and integrated degree is high, and more convenient to use flexibly quick.

Description of drawings

Fig. 1 is the Switching Power Supply schematic diagram that comprises the utility model limit surge module 10;

Fig. 2 surge module 10 circuit theory diagrams that exceed.

Embodiment

Below in conjunction with specific embodiment, the utility model is elaborated.

With reference to figure 1 and Fig. 2, Fig. 1 is the Switching Power Supply schematic diagram that comprises the utility model limit surge module 10, Fig. 2 surge module 10 circuit theory diagrams that exceed.

Limit surge module 10 comprise controllable silicon (Q1 among Fig. 2), thermistor R16 (R16 among Fig. 2, thermistor NTC10D-25), capacitor C 1 (C1 among Fig. 1,450V, 470UF), controlled benchmark (Q2-TL431 among Fig. 2) and controlled stage delay circuit.

The surge module 10 of promptly exceeding among Fig. 1 between rectifier bridge and the filter capacitor starts shooting moment at power initiation initial stage; Output voltage is not set up, and controllable silicon (Q1 among Fig. 2) is not owing to there being control signal not work, through meeting thermistor R16 (R16 among Fig. 2; Thermistor NTC10D-25) gives electric capacity (C1 among Fig. 1,450V, 470UF) charging; The input moment maximum current of this moment is by thermistor (R16 among Fig. 2, the thermistor NTC10D-25) resistance and the decision of input rectifying ceiling voltage of serial connection.

The HVDC that electric main obtains behind rectifying and wave-filtering is earlier through R16 (R16 among Fig. 2; Thermistor NTC10D-25) gives filter capacitor C1 (C1 among Fig. 1,450V, 470UF) charging; Limit the charging current size of filter capacitor C1 through R16; The output voltage of this time limit surge module 10 begins to set up, owing to be added in the control that the optocoupler (U1 among Fig. 2) of controllable silicon (Q1 among Fig. 2) controlled stage receives controlled benchmark (Q2-TL431 among Fig. 2), Q2 (Q2-TL431 among Fig. 2) does not have before the work; Not conducting of controllable silicon (Q1-CS45-16 among Fig. 2); And the voltage swing control of the controlled level of the conducting of controlled benchmark (Q2-TL431 among Fig. 2), when the voltage of controlled stage surpasses 2.5V, controlled benchmark (Q2-TL431 among Fig. 2) conducting; According to this characteristic; Control Q2 (Q2-TL431 among Fig. 2) from by the end of the time of conducting through the controlled stage delay circuit of controlled benchmark (Q2-TL431 among Fig. 2), thereby controlled the ON time of controllable silicon (Q1-CS45-16 among Fig. 2), can let filter capacitor C1 be full of fully to let again behind the electricity controllable silicon (Q1-CS45-16 among Fig. 2) conducting like this.Avoided the appearance of secondary surge current.

Among Fig. 2, the controlled stage delay circuit comprises Q1, R1, R2, R3, R4, R5, R6, R10, R11, C3, C4, C5, C6, C7, D2, and the reference utmost point of TL431 (Q2-TL431 among Fig. 2) aligns receives R3, R4, arrives ground through R1, R2.Anode directly receives ground.Negative electrode R5, R6, R10, R11 (resistance equates, is 5.1k) just receive, and four resistance R 5, R6, R10, R11 be to connect in the parallel connection back, and resistance equals the resistance of one of them, are used for the conducting electric current of restricted T L431.TL431 (Q2-TL431 among Fig. 2) is from being conducting to time of ending by controlling with reference to utmost point capacitor C 3-C6 over the ground.The effect of receiving capacitor C 1 between sampling end C+, the C-, C2 is that the voltage of returning from the output sampling is carried out secondary filtering.The control voltage of TL431 (Q2-TL431 among Fig. 2) comes from output voltage through R1/R2 and R3/R4 dividing potential drop; Size is controlled by R1-R4 resistance size; Through the value of change R1-R4,, this circuit is used in respectively on the Switching Power Supply of different voltage output levels.

Process in that output voltage is slowly set up is given capacitor C 3-C6 charging earlier; Use the controlled stage voltage of TL431 (Q2-TL431 among Fig. 2) slowly to set up, when capacitance voltage is charged to 2.5V, TL431 (Q2-TL431 among Fig. 2) conducting; Controllable silicon work, NTC quits work.Receive controllable silicon (Q1 among Fig. 2) negative electrode among Fig. 2 and be the protection diode with the D1 that controls the utmost point, the D2 that receives C+ and TL431 (Q2-TL431 among Fig. 2) is a delay capacitor C3-C6 discharge loop.The resistance R 7/R8/R9, the R13/R14/R15 that receive C+ and optocoupler (U1 among Fig. 2) 1 pin are the elementary current-limiting resistance of bi-directional light electric coupling.R7/R5, R10/R11 are the current-limiting resistance of TL431, and resistance R 15 is the secondary current-limiting resistance of bi-directional light electric coupling.

Through changing the silicon controlled through-current capacity, change the through-current capacity of this utility model, adapt to the Switching Power Supply of different capacity grade.

Controllable silicon and NTC adhere in the aluminium base copper-clad plate with heat-conducting glue, and all the other devices mount on the plank of upper strata.Middle through the contact pin connection.With silica gel inside is shut at last, add shell.This uses novel overall volume to adopt the module standard of U.S. VICOR company, and highly versatile can be used with a lot of DC/DC modules.

Controllable silicon is a power device, requires heat radiation, must water firm adhering on the base plate with heat conductive insulating.NTC only does insulation and handles, and does not do heat conduction and handles.Need reconcilable device R 1-R4 to be mounted on the superiors of plank, be convenient to regulate.Common limit surge circuit silicon controlled service time is controlled by only the settling time of output voltage; When the capacity of filter capacitor is very big, need can be very long to the time of filter capacitor charging, after output voltage is set up fully; Controllable silicon is conducting; Electric capacity is underfill electricity also, when controllable silicon conducting moment, and the appearance that can produce a very big surge current.Utility model is than common limit surge measure having increased time-delay measure, and the time that makes controllable silicon service time and filter capacitor be full of electricity keeps effectively having suppressed the appearance that controllable silicon is opened moment secondary surge current synchronously.

Common in the past limit surge circuit all is to be inserted on the pcb board with discrete component, and such mounting structure is not suitable for the requirement of Switching Power Supply miniaturization, and everyone the arrange style of pcb board is different, causes also being affected more or less of its performance.Utility model adopts the mode that is integrated in the module, and most of components and parts adopt the form that mounts, and have reduced volume, make performance more stable, cooperate more convenient with Switching Power Supply.Resource utilization is more optimized.

Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of the utility model accompanying claims according to above-mentioned explanation.

Claims

1. a Switching Power Supply limit surge module is characterized in that, comprises thermistor R16, capacitor C 1, controlled benchmark Q2 and controlled stage delay circuit; The controlled stage delay circuit comprises controllable silicon Q1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 10, resistance R 11, capacitor C 3, capacitor C 4, capacitor C 5, capacitor C 6, capacitor C 7, diode D2; The reference utmost point of TL431 aligns receives R3, R4; Arrive ground through R1, R2; Anode is directly received ground, and negative electrode is just received through resistance R 5, resistance R 6, resistance R 10, resistance R 11, and resistance R 5, resistance R 6, resistance R 10, resistance R 11 resistances equate; Resistance R 5, resistance R 6 parallel connections, resistance R 10, resistance R 11 parallel connections, the series connection of parallel connection back.

2. a Switching Power Supply is characterized in that, comprises the described Switching Power Supply limit of claim 1 surge module.