CN108832806A - Switching Power Supply control unit and the circuit detected with the control of high voltage startup time and line voltage - Google Patents

Switching Power Supply control unit and the circuit detected with the control of high voltage startup time and line voltage Download PDF

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Publication number
CN108832806A
CN108832806A CN201810725190.1A CN201810725190A CN108832806A CN 108832806 A CN108832806 A CN 108832806A CN 201810725190 A CN201810725190 A CN 201810725190A CN 108832806 A CN108832806 A CN 108832806A
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module
high voltage
voltage
vdd
output
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CN201810725190.1A
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CN108832806B (en
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励晔
黄飞明
赵文遐
朱勤为
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WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
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WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

The present invention provides a kind of Switching Power Supply control unit, including：High voltage startup module, VDD over-and under-voltage protective module and PWM control module；One input terminal of high voltage startup module is for connecing the high voltage bus after AC rectification, an output end of another input termination VDD over-and under-voltage protective module of high voltage startup module；The input terminal of one output termination VDD over-and under-voltage protective module of high voltage startup module, and it is used for the anode of external VDD capacitor C113；The another output of high voltage startup module connects an input terminal of PWM control module；The input terminal of VDD over-and under-voltage protective module is used to connect the anode of VDD capacitor C113；Another input terminal of one output termination high voltage startup module of VDD over-and under-voltage protective module；The another output of VDD over-and under-voltage protective module connects another input terminal of PWM control module, the power supply as PWM control module；The present invention realizes the accurate control of high voltage startup electric current.

Description

Switching Power Supply control unit and with the high voltage startup time control and line voltage detection Circuit
Technical field
The present invention relates to power circuit technical fields, especially a kind of to have the control of high voltage startup time and line voltage detection Circuit.
Background technique
New Energy Efficiency Standard has been carried out, and has specific specification to the efficiency grade of Switching Power Supply.New Energy Efficiency Standard reset Justice stand-by power consumption and average transfer efficiency two indices are less than according to the definition of 6 grades of Energy Efficiency Standards of star DOE of american energy The middle low power Switching Power Supply stand-by power consumption of 49W is less than equal to 100mW, and average transfer efficiency index request also improves, such as 12W The Switching Power Supply of output power, average transfer efficiency need to be greater than 83%；And the CoC V5 Energy Efficiency Standard of European Union is to stand-by power consumption Higher with the requirement of average transfer efficiency two indices, the stand-by power consumption of the middle low power Switching Power Supply of such as less than 49W needs to be less than Equal to 75mW.
With the promotion of Energy Efficiency Standard, traditional resistance starting mode starts to become very office in the design of new Energy Efficiency Standard Limit.In entire switch power supply system, boot leg can consume biggish power consumption, and therefore, designer often uses bigger Start-up resistor reduce stand-by power consumption, but this can cause Switching Power Supply to start overlong time, be unable to satisfy opening for system application Dynamic time requirement, generally, the starting time of Switching Power Supply was required less than 3 seconds.
High-voltage starting circuit because can reduction system standby power consumption by a relatively large margin and start to be used, common high pressure opens It is dynamic that there are mainly three types of modes：One is high-voltage power pipe outside using piece constructs start-up circuit；The second is using controller piece Interior integrated high voltage start-up circuit；The third is using high-voltage power pipe integrated high voltage start-up circuit.
High voltage startup can bring benefit to reduce stand-by power consumption, but there is also deficiencies simultaneously.The design of high-voltage starting circuit It has to meet strong design rule, and it is still bigger than normal according to the high voltage startup pipe area that minimum process rule designs, lead to height It presses the current capacity of power tube also bigger than normal, causes the starting time short, Mean Input Power can be very high when output short-circuit, and actually answers To the Mean Input Power under output short-circuit state, this index is required in.To solve the above problems, the prior art It is usually used and increases additional control circuit to realize, this not only increases control complexity, also increases chip cost.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of Switching Power Supply control unit, with And the circuit with the control of high voltage startup time and line voltage detection using the Switching Power Supply control unit, it solves due to height Pressure starts the problem that charging current is bigger than normal and bring output short-circuit power consumption is big；Meanwhile the present invention also uses high voltage startup mould The feature of block dexterously realizes line voltage detection function, simplifies and applies and reduce system cost.The technical side that the present invention uses Case is：
A kind of Switching Power Supply control unit, including：High voltage startup module, VDD over-and under-voltage protective module and PWM control Molding block；
One input terminal of high voltage startup module for connecing the high voltage bus after AC rectification, high voltage startup module it is another One output end of a input termination VDD over-and under-voltage protective module；The output termination VDD over-voltage of high voltage startup module is owed The input terminal of protective module is pressed, and is used for the anode of external VDD capacitor C113；The another output of high voltage startup module connects One input terminal of PWM control module, and for exporting bus voltage division signal VBUS_DIV to PWM control module；
The input terminal of VDD over-and under-voltage protective module is used to connect the anode of VDD capacitor C113；VDD over-and under-voltage protects mould Another input terminal of one output termination high voltage startup module of block, and for exporting enable signal to high voltage startup module POWERON；The another output of VDD over-and under-voltage protective module connects another input terminal of PWM control module, as PWM The power supply of control module；
The output end of PWM control module is used to connect the switch control terminal of power switch tube Q122.
Further, the Switching Power Supply control unit, start-up course are：When the voltage VDD on VDD capacitor C113 is low When VDD over-and under-voltage protective module opens thresholding, the enable signal POWERON of VDD over-and under-voltage protective module output is low Level, high voltage startup module work and high voltage startup path are connected, and high voltage bus passes through the high voltage startup path to VDD capacitor C113 charges, and VDD capacitor C113 voltage is gradually raised, when VDD capacitor C113 voltage is higher than VDD over-and under-voltage protective module When opening thresholding, the enable signal POWERON of VDD over-and under-voltage protective module output is got higher by low, the height of high voltage startup module Pressure starting path turns off and stops charging to VDD capacitor C113；The bus voltage division signal VBUS_DIV of high voltage startup module output By liter above freezing, the partial pressure value that voltage on a high voltage bus is exported after stablizing gives PWM control module；
After enable signal POWERON is by low get higher, VDD over-and under-voltage protective module can generate DC power supply and control to PWM Molding block is powered, and PWM control module is started to work, during the work time real-time detection bus voltage division signal VBUS_DIV, When bus voltage division signal VBUS_DIV is more than line voltage protection threshold range, PWM control module stops working and locks protection State returns to start-up course from new until the over-and under-voltage protection of voltage VDD power down triggering VDD over-and under-voltage protective module.
Specifically, high voltage startup module includes high voltage startup pipe Q210, pull-up resistor R220, diode D211, D213, limit It flows detection resistance R212, current limit control module, high voltage startup and controls pipe Q221, pull down resistor R222；Wherein Q210, Q221 are NMOS tube；
Be connected with the drain terminal of high voltage startup pipe Q210 as high voltage startup module one of one end of pull-up resistor R220 Input terminal, for connecing the high voltage bus after AC rectification；The grid end of high voltage startup pipe Q210 connects the other end of pull-up resistor R220 The electric current aerial drainage end of pipe Q221 drain terminal and current limit control module is controlled with high voltage startup, and as node N231；High voltage startup The anode of the source terminating diode D211 of pipe Q210 and the negative terminal of diode D213, the positive termination primary side ground terminal of diode D213；
The negative terminal of a terminating diode D211 of current limliting detection resistance R212；The two termination current limlitings of current limliting detection resistance R212 Two input terminals of control module, the node that wherein current limliting detection resistance R212 is connected with diode D211 negative terminal connect Current limited Control The positive input terminal of module, the negative input end of another termination current limit control module of current limliting detection resistance R212, and opened as high pressure One output end of dynamic model block is used to connect the anode of VDD capacitor C113；
The grid end that high voltage startup controls pipe Q221 terminates the VDD over-voltage as another input of high voltage startup module and owes Press an output end of protective module；The source of high voltage startup control pipe Q221 connects one end of pull down resistor R222, and as height The another output of pressure starting module connects an input terminal of the PWM control module；Another termination of pull down resistor R222 Primary side ground terminal.
Further, current limit control module includes：Current limliting sampling module, voltage-controlled current source；Current limliting sampling module just, Negative input end connects one end and the other end of current limliting detection resistance R212 respectively, and the output of current limliting sampling module terminates voltage-controlled current source Positive input terminal, the negative input of voltage-controlled current source terminates reference signal V241；The electric current of voltage-controlled current source flows into terminated nodes N231。
Alternatively, current limit control module includes：PMOS tube Q301, NMOS tube Q302, Q303；The source of PMOS tube Q301 connects two The negative terminal of pole pipe D211 and one end of current limliting detection resistance R212, the grid end of PMOS tube Q301 connect the another of current limliting detection resistance R212 One end；The drain terminal of PMOS tube Q301 connects the grid end of the drain terminal of NMOS tube Q302, grid end and NMOS tube Q303；NMOS tube Q302 and The source of Q303 connects primary side ground terminal；The leakage terminated nodes N231 of NMOS tube Q303.
Further, pull-up resistor R220 is more than or equal to 10 megohms.
Further, pull down resistor R220 is 10k ohm to k ohm tens of.
A kind of circuit with the control of high voltage startup time and line voltage detection, controls single including above-mentioned Switching Power Supply Member, input rectifying filter circuit, transformer T106, diode D111, VDD capacitor C113, power tube Q112, output rectification filter Circuit；
The positive output of input rectifying filter circuit terminates high voltage bus, the input terminal and transformation of high voltage startup module The primary side winding different name end of device T106；The negative output termination primary side of input rectifying filter circuit；The primary side of transformer T106 around The electric current of group termination power tube Q112 of the same name flows into end, and the switch control of power tube Q112 terminates the output end of PWM control module, Current output terminal is with connecing primary side；
The anode of the auxiliary winding of transformer T106 terminating diode D111 of the same name, the negative terminal of diode D111 connect VDD electricity Hold the anode of C113；The auxiliary winding different name termination primary side of transformer T106；An output end and VDD for high voltage startup module The anode of the input terminal connection VDD capacitor C113 of over-and under-voltage protective module；
The vice-side winding of transformer T106 connects output rectifier and filter, exports direct current by output rectifier and filter Pressure.
The advantage of the invention is that：The present invention controls the starting time by control high voltage startup electric current, to solve defeated Big this problem of short-circuit dissipation out；In addition, the present invention also utilizes the feature of high voltage startup module, line voltage inspection is dexterously realized Brake, application scheme is simple, and cost reduces.
Detailed description of the invention
Fig. 1 is total electrical schematic diagram of the invention.
Fig. 2 is an example schematic diagram of high voltage startup module of the invention.
Fig. 3 is another example schematic diagram of high voltage startup module of the invention.
Fig. 4 is high voltage startup process timing diagram of the invention.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1, the present invention proposes a kind of circuit with the control of high voltage startup time and line voltage detection, core It is a Switching Power Supply control unit 120, shown in dotted line frame 120 as shown in figure 1；Of the invention focuses on Switching Power Supply control Unit 120, therefore the circuit theory of the part is discussed in detail；
A kind of Switching Power Supply control unit 120, including：High voltage startup module 121, VDD over-and under-voltage protective module 122, And PWM control module 123；
One input terminal of high voltage startup module 121 is for connecing the high voltage bus 102 after AC rectification, high voltage startup module One output end of 121 another input termination VDD over-and under-voltage protective module 122；One of high voltage startup module 121 is defeated The input terminal of VDD over-and under-voltage protective module 122 is terminated out, and is used for the anode of external VDD capacitor C113；High voltage startup module 121 another output connects an input terminal of PWM control module 123, and for exporting bus to PWM control module 123 Voltage division signal VBUS_DIV；
The input terminal of VDD over-and under-voltage protective module 122 is used to connect the anode of VDD capacitor C113；The protection of VDD over-and under-voltage Another input terminal of one output termination high voltage startup module 121 of module 122, and for being exported to high voltage startup module 12 Enable signal POWERON；The another output of VDD over-and under-voltage protective module 122 connects another of PWM control module 123 Input terminal, the power supply as PWM control module 123；
The output end of PWM control module 123 is used to connect the switch control terminal of power switch tube Q122.
Specifically, high voltage startup module 121 include high voltage startup pipe Q210, pull-up resistor R220, diode D211, D213, current limliting detection resistance R212, current limit control module 200, high voltage startup control pipe Q221, pull down resistor R222；Wherein Q210, Q221 are NMOS tube；
One end of pull-up resistor R220 be connected with the drain terminal of high voltage startup pipe Q210 as high voltage startup module 121 one A input terminal, for connecing the high voltage bus 102 after AC rectification；The grid end of high voltage startup pipe Q210 connects the another of pull-up resistor R220 The electric current aerial drainage end of one end and high voltage startup control pipe Q221 drain terminal and current limit control module 220, and as node N231； The positive termination of the anode of the source terminating diode D211 of high voltage startup pipe Q210 and the negative terminal of diode D213, diode D213 is former Side ground terminal；
The negative terminal of a terminating diode D211 of current limliting detection resistance R212；The two termination current limlitings of current limliting detection resistance R212 Two input terminals of control module 200, the node that wherein current limliting detection resistance R212 is connected with diode D211 negative terminal connect current limliting The positive input terminal of control module 200, the negative input end of another termination current limit control module 200 of current limliting detection resistance R212, and It is used to connect the anode of VDD capacitor C113 as an output end of high voltage startup module 121；
The grid end that high voltage startup controls pipe Q221 terminates the VDD mistake as another input of high voltage startup module 121 Press an output end of under-voltage protective module 122；The source of high voltage startup control pipe Q221 connects one end of pull down resistor R222, and Another output as high voltage startup module 121 connects an input terminal of the PWM control module 123；Pull down resistor Another termination primary side ground terminal of R222.Primary side ground terminal is for connecing primary side.
One example of current limit control module 200 is as shown in Fig. 2, include：Current limliting sampling module 242, voltage-controlled current source 243；The positive and negative input terminal of current limliting sampling module 242 connects one end and the other end of current limliting detection resistance R212, current limliting sampling respectively The positive input terminal of the output termination voltage-controlled current source 243 of module 242, the negative input of voltage-controlled current source 243 terminate reference signal V241；The electric current of voltage-controlled current source 243 flows into terminated nodes N231；
Start-up course is：When the voltage VDD on VDD capacitor C113 opens thresholding lower than VDD over-and under-voltage protective module 122 When, the enable signal POWERON that VDD over-and under-voltage protective module 122 exports is low level, and high voltage startup module 121 works simultaneously High voltage startup path is connected, high voltage bus 102 is charged by the high voltage startup path to VDD capacitor C113, VDD capacitor C113 voltage is gradually raised, when VDD capacitor C113 voltage, which is higher than VDD over-and under-voltage protective module 122, opens thresholding, VDD mistake The enable signal POWERON that pressure under-voltage protective module 122 exports is got higher by low, the high voltage startup path of high voltage startup module 121 It turns off and stops charging to VDD capacitor C113；In addition, high voltage startup module 121 export bus voltage division signal VBUS_DIV by Liter above freezing exports the partial pressure value of voltage on a high voltage bus to PWM control module 123 after stablizing；
After enable signal POWERON is by low get higher, VDD over-and under-voltage protective module 122 can generate DC power supply to PWM Control module 123 is powered, and PWM control module 123 is started to work, during the work time real-time detection bus voltage division signal VBUS_DIV (herein refers to protect lower than line voltage when bus voltage division signal VBUS_DIV is more than line voltage protection threshold range Lower threshold is higher than line voltage protection upper limit threshold), PWM control module 123 stops working and locks guard mode, Zhi Dao electricity The over-and under-voltage protection of VDD power down triggering VDD over-and under-voltage protective module 122 is pressed, circuit is from newly returning to above-mentioned start-up course；
A kind of circuit with the control of high voltage startup time and line voltage detection, as shown in Figure 1, including above-mentioned Switching Power Supply Control unit 120, input rectifying filter circuit 101, transformer T106, diode D111, VDD capacitor C113, power tube Q112, Output rectifier and filter 107；
The positive output of input rectifying filter circuit 101 terminates high voltage bus 102, an input of high voltage startup module 121 End and the primary side winding different name end of transformer T106；Voltage on high voltage bus 102 is VBUS；Input rectifying filter circuit Negative output is with terminating primary side；The electric current of the primary side winding of transformer T106 termination power tube Q112 of the same name flows into end, power tube The output end of the switch control termination PWM control module 123 of Q112, current output terminal is with connecing primary side；Power tube Q112 can be used NMOS tube, drain terminal, source are respectively as current input terminal and current output terminal, and grid end is as switch control terminal；Power tube IGBT pipe can also be used in Q112；
The anode of the auxiliary winding of transformer T106 terminating diode D111 of the same name, the negative terminal of diode D111 connect VDD electricity Hold the anode of C113, VDD capacitor C113 anode voltage is VDD；The auxiliary winding different name termination primary side of transformer T106；；It is high One output end of pressure starting module 121 is connecting VDD capacitor C113 just with the input terminal of VDD over-and under-voltage protective module 122 End；
The vice-side winding of transformer T106 connects output rectifier and filter 107, is exported by output rectifier and filter 107 DC voltage；Input rectifying filter circuit 101 and output rectifier and filter 107 are custom circuit, and realization is given in Fig. 1 Physical circuit, repeat no more；
After power-supply system powers on, the DC voltage on high voltage bus 102 is gradually increasing, and high voltage bus 102 passes through pull-up electricity Resistance R220 charges to the grid end of high voltage startup pipe Q210, and the grid end voltage of high voltage startup pipe Q210 is gradually raised above high pressure After the unlatching threshold value for starting pipe Q210, high voltage startup pipe Q210 conducting；
Pull-up resistor R220 can generally select the resistance of ten megohms of grades or more, and one can slow down high voltage startup pipe Q210 Turn on process reduces impact of the conducting electric current to power tube；Secondly 121 mesohigh of high voltage startup module starting path can be reduced After shutdown, as pull-up resistor R220 to there are access and caused by loss.
After high voltage startup pipe Q210 conducting, high direct voltage bus 102 is by high voltage startup pipe 210, diode D211, limit The high voltage startup path that stream detection resistance R212 is constituted charges to VDD capacitor C113, and charging current is in current limliting detection resistance R212 generates pressure drop, and the input signal of the pressure drop voltage as current limit control module 200, current limit control module 200 is according to above-mentioned The size of pressure drop voltage controls the size of charging current.
Diode D211, D213 are to prevent from high voltage bus 102 VDD charging current is counter under negative pressure condition to fill problem.Work as height When pressure bus 102 is connected to the drain electrode, i.e. transformer T106 primary side winding Same Name of Ends of above-mentioned Fig. 1 primary side side power tube Q112, in function During rate pipe Q112 conducting or system resonance, it will appear negative pressure on high voltage bus 102, diode D213 is as height at this time The negative pressure clamp of voltage on bus 102 is pressed, diode D211 is to prevent VDD current flowing backwards (i.e. from Fig. 2 current limliting detection resistance Side direction is counter to the left on the right side of R212 fills).
Size relation of the voltage-controlled current source 243 according to current limliting sampling module 242 output voltage and reference signal V241, control Leakage current size of the node N231 to ground；When the charging current of VDD capacitor C113 becomes larger, what current limliting detection resistance R212 was generated Pressure drop also accordingly becomes larger, and the output signal of current limliting sampling module 242 can be higher than reference signal V241, and voltage-controlled current source 243 increases Leakage current of the node N231 to ground, the decline of node N231 current potential, the unlatching of high voltage startup pipe Q210 die down, and charging current subtracts It is small；
When the voltage on VDD capacitor C113 is more than that VDD over-and under-voltage protective module 122 opens thresholding, VDD over-and under-voltage Protective module 122 exports enable signal POWERON and is got higher by low, indicates that start-up course terminates, boot leg can close.When making After energy signal POWERON becomes high level, high voltage startup controls pipe Q221 conducting, by pull down resistor R222 by node N231's Current potential is drawn to closely, constitute at this time by pull-up resistor R220, high voltage startup control pipe Q221, pull down resistor R222 form from An access of the high voltage bus 102 to ground；
As described above, pull-up resistor R220 is usually the resistance for requiring ten megohms of grades or more, high voltage startup control pipe The conduction impedance of Q221 can be ignored, and pull down resistor R220 is 10k ohm to k ohm tens of；Therefore Q221 is connect with R222 Node N131 can be regarded as only busbar voltage divider node relevant to pull-up resistor R220, pull down resistor R222；Node Bus voltage division signal VBUS_DIV on N131 can be indicated by following formula：
Wherein Rd is the resistance value of pull down resistor R222, and Rp is the resistance value of pull-up resistor R220, and VBUS is on high voltage bus 102 Voltage；
Fig. 3 shows another realization example of current limit control module 200 in the present invention；Current limit control module 200 includes PMOS tube Q301, NMOS tube Q302, Q303；The negative terminal and current limliting detection resistance of the source terminating diode D211 of PMOS tube Q301 One end of R212, the grid end of PMOS tube Q301 connect the other end of current limliting detection resistance R212；The drain terminal of PMOS tube Q301 meets NMOS The grid end of the drain terminal of pipe Q302, grid end and NMOS tube Q303；The source of NMOS tube Q302 and Q303 connect primary side ground terminal；NMOS The leakage terminated nodes N231 of pipe Q303.
As charging current ICHGBecome larger, the pressure drop generated on current limliting detection resistance R212 is greater than the unlatching of PMOS tube Q301 When threshold value, PMOS tube Q301 is begun to turn on, and has been shunted part charging current from boot leg (high voltage startup path), has been flowed through The current mirror that NMOS tube Q302, Q303 is constituted, control node N231 voltage makes it become smaller, to reduce high voltage startup electric current；
Normally, the electric current I of current limliting detection resistance R212 is flowed throughCHGIt is far longer than the electric current I for flowing through power tube Q301P1, electricity Flow IP1Can ignore, thus current limliting formula can simplify for：
It is available by formula (2), resistance value Rlimit of the high voltage startup charging current with current limliting detection resistance R212 With the unlatching threshold value P of PMOS tube Q3011_vthIt is related, it is not related with the size of line voltage, realize that high pressure opens in full voltage range The consistency and the consistency of starting time of streaming current.
Fig. 4 is high voltage startup process timing diagram of the invention；VBUS indicates voltage signal on high direct voltage bus 102, ICHG Indicating that high voltage charging current, Tstart indicate the high voltage startup charging time, VDD indicates VDD capacitor C113 anode voltage, POWERON indicates the enable signal of high voltage startup module, and VBUS_DIV indicates bus voltage division signal；
After system electrification, voltage VBUS is increased on high direct voltage bus 102, and high voltage startup path opens and enters VDD electricity Hold C113 charging process, the calculation formula in the charging time of VDD capacitor C113 is：
CVDDIt is the capacitance of VDD capacitor C113；
Above-mentioned formula (2) are substituted into formula (3), are obtained：
Parameter VDD, C in formula (4)VDD, P1_vth respectively indicate above-mentioned VDD capacitor C113 voltage and capacitance, with And the unlatching threshold value of PMOS tube Q301, their parameter determine, therefore, as long as passing through the resistance value of setting current limliting detection resistance R212 The setting of high voltage startup time can be realized in the size of Rlimit.
When the voltage VDD on VDD capacitor C113 is more than that VDD over-and under-voltage protective module 122 opens thresholding, enable signal POWERON is got higher by low, indicates high voltage startup process shutdown, the work of PWM control module.
Enable signal POWERON gets higher rear high voltage startup path shutdown by low, and high voltage startup module exports high voltage bus Bus voltage division signal VBUS_DIV, the signal are an input signals of PWM control module, are detected as line voltage over-and under-voltage Differentiation signal.
When output short-circuit, primary side transmits maximum power to secondary side, with maximum current to output capacitance (output rectification filter Filter capacitor in circuit 107) charge, but export because short circuit and voltage is always zero, the auxiliary winding of N times of ratio Voltage is also zero, therefore VDD capacitor C113 only can be just electrically charged in the high voltage startup stage, charging time Tstart；Starting knot Circuit works after beam, since auxiliary winding voltage is still that zero, VDD capacitor C113 starts electric discharge until vdd voltage is lower than VDD mistake When under-voltage protective module 122 being pressed to open thresholding, high voltage startup process, discharge time T are returned touvlo；It discharges in VDD capacitor C113 In the process, the input power of system is Pinmax, the Mean Input Power of system is P when output short-circuitinavg=Pinmax*Tuvlo/ (Tuvlo+Tstart), wherein PinmaxAnd TuvloParameter is related to system setting, it is believed that is constant, therefore be when output short-circuit The Mean Input Power of system mainly with starting time TstartSize is related；The present invention is accurately controlled by setting Rlimit resistance value and is opened Dynamic time TstartSize, solve conventional high-tension start time TstartIt is too small and Mean Input Power is high when leading to output short-circuit This problem.
The present invention realizes the accurate control of high voltage startup electric current by the control to high voltage startup module mesohigh starting pipe System realizes the consistency of the consistency of high voltage startup electric current and starting time in full voltage range, well solves short because exporting The problems such as power consumption is excessive is averagely inputted caused by road etc.；In addition, the present invention has also dexterously used the circuit of high voltage startup module Feature, with and its simple mode realize the detection of line voltage.
Merely exemplary, the present invention has been applied to flyback power supply converter.It will be appreciated that the present invention has more It is widely applied range.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it, Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover In the scope of the claims of the present invention.

Claims (8)

1. a kind of Switching Power Supply control unit (120), which is characterized in that including：High voltage startup module (121), VDD over-and under-voltage Protective module (122) and PWM control module (123)；
One input terminal of high voltage startup module (121) is for connecing the high voltage bus (102) after AC rectification, high voltage startup module (121) output end of another input termination VDD over-and under-voltage protective module (122)；High voltage startup module (121) The input terminal of one output termination VDD over-and under-voltage protective module (122), and it is used for the anode of external VDD capacitor C113；High pressure The another output of starting module (121) connects an input terminal of PWM control module (123), and is used for PWM control module (123) bus voltage division signal VBUS_DIV is exported；
The input terminal of VDD over-and under-voltage protective module (122) is used to connect the anode of VDD capacitor C113；VDD over-and under-voltage protects mould Another input terminal of one output termination high voltage startup module (121) of block (122), and be used for high voltage startup module (121) enable signal POWERON is exported；The another output of VDD over-and under-voltage protective module (122) connects PWM control module (123) another input terminal, the power supply as PWM control module (123)；
The output end of PWM control module (123) is used to connect the switch control terminal of power switch tube Q122.
2. Switching Power Supply control unit (120) as described in claim 1, which is characterized in that
Start-up course is：When the voltage VDD on VDD capacitor C113 opens thresholding lower than VDD over-and under-voltage protective module (122) When, the enable signal POWERON of VDD over-and under-voltage protective module (122) output is low level, high voltage startup module (121) work Make and be connected high voltage startup path, high voltage bus (102) is charged by the high voltage startup path to VDD capacitor C113, VDD Capacitor C113 voltage is gradually raised, when VDD capacitor C113 voltage, which is higher than VDD over-and under-voltage protective module (122), opens thresholding, The enable signal POWERON of VDD over-and under-voltage protective module (122) output is got higher by low, the high pressure of high voltage startup module (121) Starting path turns off and stops charging to VDD capacitor C113；The bus voltage division signal VBUS_ of high voltage startup module (121) output For DIV by liter above freezing, the partial pressure value that voltage on a high voltage bus is exported after stablizing gives PWM control module (123)；
After enable signal POWERON is by low get higher, VDD over-and under-voltage protective module 122 can generate DC power supply and control PWM Module 123 is powered, and PWM control module (123) is started to work, during the work time real-time detection bus voltage division signal VBUS_DIV, when bus voltage division signal VBUS_DIV is more than line voltage protection threshold range, PWM control module (123) stops It works and locks guard mode, until the over-and under-voltage protection of voltage VDD power down triggering VDD over-and under-voltage protective module (122), Start-up course is returned to from new.
3. Switching Power Supply control unit (120) as described in claim 1, which is characterized in that
High voltage startup module (121) includes high voltage startup pipe Q210, pull-up resistor R220, diode D211, D213, current limliting detection Resistance R212, current limit control module (200), high voltage startup control pipe Q221, pull down resistor R222；Wherein Q210, Q221 are NMOS tube；
Be connected with the drain terminal of high voltage startup pipe Q210 as high voltage startup module (121) one of one end of pull-up resistor R220 Input terminal, for connecing the high voltage bus (102) after AC rectification；The grid end of high voltage startup pipe Q210 connects the another of pull-up resistor R220 The electric current aerial drainage end of one end and high voltage startup control pipe Q221 drain terminal and current limit control module (220), and as node N231；The anode of the source terminating diode D211 of high voltage startup pipe Q210 and the negative terminal of diode D213, diode D213 is just Terminate primary side ground terminal；
The negative terminal of a terminating diode D211 of current limliting detection resistance R212；The two termination Current limited Controls of current limliting detection resistance R212 Two input terminals of module (200), the node that wherein current limliting detection resistance R212 is connected with diode D211 negative terminal connect current limliting control The positive input terminal of molding block (200), the negative input end of another termination current limit control module (200) of current limliting detection resistance R212, And it is used to connect the anode of VDD capacitor C113 as an output end of high voltage startup module (121)；
The grid end that high voltage startup controls pipe Q221 terminates the VDD over-voltage as another input of high voltage startup module (121) One output end of under-voltage protective module (122)；The source of high voltage startup control pipe Q221 connects one end of pull down resistor R222, and Another output as high voltage startup module (121) connects an input terminal of the PWM control module (123)；Drop-down electricity Hinder another termination primary side ground terminal of R222.
4. Switching Power Supply control unit (120) as claimed in claim 3, which is characterized in that
Current limit control module (200) includes：Current limliting sampling module (242), voltage-controlled current source (243)；Current limliting sampling module (242) Positive and negative input terminal connect one end and the other end of current limliting detection resistance R212, the output termination of current limliting sampling module (242) respectively The negative input of the positive input terminal of voltage-controlled current source (243), voltage-controlled current source (243) terminates reference signal V241；Voltage-controlled current source (243) electric current flows into terminated nodes N231.
5. Switching Power Supply control unit (120) as claimed in claim 3, which is characterized in that
Current limit control module (200) includes：PMOS tube Q301, NMOS tube Q302, Q303；The source terminating diode of PMOS tube Q301 The negative terminal of D211 and one end of current limliting detection resistance R212, the grid end of PMOS tube Q301 meet the another of current limliting detection resistance R212 End；The drain terminal of PMOS tube Q301 connects the grid end of the drain terminal of NMOS tube Q302, grid end and NMOS tube Q303；NMOS tube Q302 and The source of Q303 connects primary side ground terminal；The leakage terminated nodes N231 of NMOS tube Q303.
6. Switching Power Supply control unit (120) as claimed in claim 3, which is characterized in that
Pull-up resistor R220 is more than or equal to 10 megohms.
7. Switching Power Supply control unit (120) as claimed in claim 3, which is characterized in that
Pull down resistor R220 is 10k ohm to k ohm tens of.
8. a kind of circuit with the control of high voltage startup time and line voltage detection, which is characterized in that including such as claim 1~ Switching Power Supply control unit (120), input rectifying filter circuit (101), transformer T106, diode described in any one of 7 D111, VDD capacitor C113, power tube Q112, output rectifier and filter (107)；
The positive output of input rectifying filter circuit (101) terminates high voltage bus (102), and one of high voltage startup module (121) is defeated Enter end and the primary side winding different name end of transformer T106；The negative output termination primary side of input rectifying filter circuit；Transformer The electric current of the primary side winding of T106 termination power tube Q112 of the same name flows into end, the switch control termination PWM control of power tube Q112 The output end of module (123), current output terminal is with connecing primary side；
The anode of the auxiliary winding of transformer T106 terminating diode D111 of the same name, the negative terminal of diode D111 connect VDD capacitor The anode of C113；The auxiliary winding different name termination primary side of transformer T106；One output end of high voltage startup module (121) and The anode of the input terminal connection VDD capacitor C113 of VDD over-and under-voltage protective module (122)；
The vice-side winding of transformer T106 connects output rectifier and filter (107), is exported by output rectifier and filter (107) DC voltage.
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