CN101800467A - A kind of protective circuit of Switching Power Supply - Google Patents

A kind of protective circuit of Switching Power Supply Download PDF

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Publication number
CN101800467A
CN101800467A CN 201010123855 CN201010123855A CN101800467A CN 101800467 A CN101800467 A CN 101800467A CN 201010123855 CN201010123855 CN 201010123855 CN 201010123855 A CN201010123855 A CN 201010123855A CN 101800467 A CN101800467 A CN 101800467A
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output
signal
power supply
switching power
connects
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CN 201010123855
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CN101800467B (en
Inventor
吴德钦
贾立刚
李国军
巫炜
刘伟
林雄杰
战·阮
布鲁斯·弗格森
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MICROSEMI Corp TAIWAN OFFICE
BCD Semiconductor Manufacturing Ltd
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MICROSEMI Corp TAIWAN OFFICE
BCD Semiconductor Manufacturing Ltd
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Abstract

The invention discloses a kind of protective circuit of Switching Power Supply, comprising: detecting unit is used for the output feedback signal and the preset reference voltage of Switching Power Supply are compared, according to corresponding generation high level of comparative result or low level level signal; Control unit is used for generating control signal according to the level signal of detecting unit generation and the enable signal of Switching Power Supply; Discharge cell is used for the control signal according to the control unit generation, the conducting or the shutoff of the pairing discharge path over the ground of actual output of control switching.This protective circuit of switch power source can realize that switch power soft-start arrives the smooth transition of operate as normal.

Description

A kind of protective circuit of Switching Power Supply
Technical field
The present invention relates to field of switch power, relate in particular to a kind of protective circuit of Switching Power Supply.
Background technology
Being widely used of DC/DC Switching Power Supply.As shown in Figure 1, be the output interlock circuit structure in the Switching Power Supply, wherein, the tie point between main switch 11 and the synchro switch pipe 12 is the output SW of Switching Power Supply.When using Switching Power Supply, generally the output SW with Switching Power Supply passes through outputting inductance L and output capacitance C ground connection, and the tie point between outputting inductance L and the output capacitance C is as the actual output VOUT of Switching Power Supply.
In order to prevent that the Switching Power Supply voltage overshoot that the output voltage V out generation of actual output VOUT output is bigger when starting, the electric current among the outputting inductance L from producing bigger surge current, can in Switching Power Supply, add soft start control, so that output voltage V out and inductive current slowly change to a certain preset value.A kind of control method commonly used is: the reference voltage that slowly is promoted to preset value since 0 is set, makes output voltage follow reference voltage by the loop adjustment and be increased to preset value gradually from 0, to avoid the overshoot of output voltage.
But in actual applications, may there be residual voltage in actual output VOUT, makes output voltage V out rise since 0.Because start-up course belongs to closed-loop control, when detecting output feedback signal and be higher than the reference voltage of described slow rising, control circuit can be by conducting synchro switch pipe 12 to drag down output voltage V out, can open synchro switch pipe 12 for a long time like this, make output voltage V out through outputting inductance L and 12 continuous discharges of synchro switch pipe.
In this case, the 12 long-time conductings of synchro switch pipe, the reverse current that flows through synchro switch pipe 12 is very big, has increased the loss of synchro switch pipe 12, so that surpass its thermal limit, can damage synchro switch pipe 12 when serious.
In order to address this problem, a kind of soft start protective circuit commonly used at present connects the negative-phase input of first comparator 21 with the output feedback end FB of Switching Power Supply as shown in Figure 2, and normal phase input end connects a reference voltage SSREF who slowly changes.When Switching Power Supply prepare to start, output feedback signal and reference voltage SSREF are compared, if output feedback signal less than reference voltage SSREF, Switching Power Supply normally starts; If output feedback signal, then turn-offs main switch 11 and synchro switch pipe 12 greater than reference voltage SSREF, at this moment, reference voltage SSREF still normally rises, when being higher than output feedback signal, Switching Power Supply enters start-up course, main switch 11 and synchro switch pipe 12 alternate conduction.
But, the voltage that prestores on actual output VOUT is lower than the predetermined output voltage of Switching Power Supply, and when output feedback signal is greater than reference voltage SSREF in the start-up course, then the starting stage main switch 11 of soft start and synchro switch pipe 12 turn-off simultaneously, when reference voltage SSREF rises to greater than output feedback signal, just normal alternate conduction main switch 11 and synchro switch pipe 12, thereby make the switching that has two states in the soft start-up process of Switching Power Supply, cause the output voltage V out waveform of actual output VOUT unsmooth easily; And, when if the voltage that prestores on the actual output VOUT is higher than the preset value of output voltage, in whole soft-start period, main switch 11 and synchro switch pipe 12 turn-off simultaneously, soft-start period just can be adjusted to preset value with output voltage V out by the loop adjustment after finishing, and still may occur the problem of output voltage V out overshoot in the adjustment process.Based on above problem as can be known, existing soft start protective circuit also can't guarantee that switch power soft-start arrives the smooth transition of operate as normal.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is, a kind of protective circuit of Switching Power Supply is provided, and can realize that switch power soft-start arrives the smooth transition of operate as normal.
For this reason, the embodiment of the invention adopts following technical scheme:
The embodiment of the invention provides a kind of protective circuit of Switching Power Supply, it is characterized in that, comprising:
Detecting unit is used for the output feedback signal and the preset reference voltage of Switching Power Supply are compared, according to corresponding generation high level of comparative result or low level level signal;
Control unit is used for generating control signal according to the level signal of detecting unit generation and the enable signal of Switching Power Supply;
Discharge cell is used for the control signal according to the control unit generation, the conducting or the shutoff of the pairing discharge path over the ground of actual output of control switching.
Wherein, detecting unit specifically is used for: when output feedback signal during less than preset reference voltage, generate high level signal; When output feedback signal during, generate low level signal greater than preset reference voltage.
Control unit specifically is used for:
When detecting unit generates high level signal, when described enable signal is low level signal, generate low level control signal; When detecting unit generates low level signal, when described enable signal is low level signal, generate the control signal of high level.
Described discharge cell specifically is used for:
When described control signal is high level, control the conducting of the pairing discharge path over the ground of actual output; When described control signal is low level, controls the pairing discharge path over the ground of actual output and turn-off.
Described detecting unit is realized that by second comparator normal phase input end of described second comparator connects described preset reference voltage, and negative-phase input connects the output feedback end of Switching Power Supply; The output of described second comparator is exported described level signal.
Described control unit comprises RS latch and not gate; Wherein,
The output of RS latch S end joint detection unit, the R end connects enable signal, and the output of RS latch connects the input of described not gate, and the output of described not gate is exported described control signal.
Described control unit comprises d type flip flop and not gate; Wherein,
The D end of d type flip flop connects supply voltage, the output of CLK end joint detection unit, and the R end connects enable signal, and output connects the input of described not gate, and the output of described not gate is exported described control signal.
Described discharge cell comprises: first switching tube, the 3rd resistance and outputting inductance; Wherein,
The grid of first switching tube connects the output of described control unit, source ground, and drain electrode connects the output of described Switching Power Supply by the 3rd resistance; The output of described Switching Power Supply connects the actual output of Switching Power Supply by outputting inductance.
Technique effect for technique scheme is analyzed as follows:
The protective circuit of Switching Power Supply of the present invention makes Switching Power Supply all be operated under the complete closed-loop control in whole starting process, and, before starting, Switching Power Supply promptly can detect and the output SW by Switching Power Supply discharges to the electric charge that actual output VOUT stores the output voltage V out among the actual output VOUT, make the output voltage V out of actual output VOUT to realize the smooth transition of switch power soft-start since 0 normal complete startup to operate as normal; And this protective circuit realizes simple relatively, is easy to realize.
Description of drawings
Fig. 1 is an output interlock circuit structural representation in the prior art Switching Power Supply;
Fig. 2 is a kind of soft start protective circuit structural representation of prior art Switching Power Supply;
Fig. 3 is an embodiment of the invention protective circuit of switch power source structural representation;
Fig. 4 is a kind of implementation structure schematic diagram of embodiment of the invention protective circuit of switch power source;
Fig. 5 is the another kind of implementation structure schematic diagram of embodiment of the invention protective circuit of switch power source.
Embodiment
Below, be described with reference to the accompanying drawings the realization of embodiment of the invention protective circuit of switch power source.
Fig. 3 is an embodiment of the invention protective circuit of switch power source structural representation, and as shown in Figure 3, this circuit comprises:
Detecting unit 310 is used for the output feedback signal and the preset reference voltage of Switching Power Supply are compared, according to corresponding generation high level of comparative result or low level level signal.
Concrete, detecting unit 310 can be used for: when output feedback signal during less than preset reference voltage, generate high level signal; When output feedback signal during, generate low level signal greater than preset reference voltage.
This reference voltage should be set to one and approach 0 value as far as possible, so that make Switching Power Supply to begin to start from approaching 0 magnitude of voltage.
Control unit 320 is used for generating control signal according to the level signal of detecting unit 310 generations and the enable signal of Switching Power Supply.
Control unit 320 specifically is used for: when detecting unit 310 generates high level signal, when described enable signal is low level signal, generate low level control signal; When detecting unit 310 generates low level signal, when described enable signal is low level signal, generate the control signal of high level.
Discharge cell 330 is used for the control signal according to the control unit generation, the conducting or the shutoff of the pairing discharge path over the ground of actual output of control switching.
Wherein, described discharge cell 330 specifically is used for: when control signal is high level, control the conducting of the pairing discharge path over the ground of actual output; When control signal is low level, controls the pairing discharge path over the ground of actual output and turn-off.
Fig. 4 is that a kind of concrete circuit of the described protective circuit of switch power source of Fig. 3 is realized, as shown in Figure 4, wherein, the output SW of Switching Power Supply is by outputting inductance L and output capacitance C ground connection.Tie point between outputting inductance L and the output capacitance C is the actual output VOUT of Switching Power Supply; Actual output VOUT is by first resistance R 1 and second resistance R, 2 ground connection, and the tie point of first resistance R 1 and second resistance R 2 is the output feedback end FB of Switching Power Supply.Wherein, for the Switching Power Supply of fixing output, first resistance R 1 and second resistance R 2 are integrated in Switching Power Supply inside, and for the Switching Power Supply of adjustable output, first resistance R 1 and 2 of second resistance R independently are provided with by the user.As shown in Figure 4, described protective circuit comprises:
The output feedback end FB of Switching Power Supply is connected with the negative-phase input of second comparator 41, to the output feedback signal of the negative-phase input input switch power supply of second comparator 41; The normal phase input end of second comparator 41 connects preset reference voltage REF, and the output of second comparator 41 connects the S end of RS latch 42.Wherein, when the output feedback signal of output feedback end FB output is lower than preset reference voltage REF, second comparator, 41 output high level signals, when the output feedback signal of output feedback end FB output is higher than preset reference voltage REF, second comparator, 41 output low level signals.
The output of second comparator 41 connects the S end of RS latch 42, and the R end of RS latch 42 connects the Enable Pin EN of Switching Power Supply, receives enable signal; The output Q of RS latch 42 connects the input of not gate 43, and the output of not gate 43 connects the grid of first switching tube 45.Wherein, when second comparator, 41 output high level signals, when the enable signal of described Enable Pin EN output was low level signal, RS latch 42 was exported high level signals, and then is converted to low level control signal by not gate 43; When second comparator 41 generates low level signals, when described enable signal is low level signal, RS latch 42 output low level signals, and then be converted to the control signal of high level by not gate 43.
The output of the grid NAND gate 43 of first switching tube 45 links to each other, source ground, and drain electrode connects the output SW of Switching Power Supply by the 3rd resistance R 3.
Wherein, the circuit of described second comparator, 41 formations has been realized the function of detecting unit 310.The circuit that described RS latch 42 and not gate 43 are formed has been realized the function of described control unit 320, and the signal of telecommunication of not gate 43 outputs output is used to control opening or turn-offing of first switching tube 45.And described first switching tube 45, the 3rd resistance R 3 and outputting inductance L have constituted the pairing discharge path over the ground of described actual output VOUT in the described discharge cell 330.
More than the operation principle of protective circuit shown in Figure 4 be:
When the output feedback signal of output feedback end FB output is lower than reference voltage REF, second comparator, 41 output high level, RS latch 42 is output as high level, be converted to low level through not gate 43 after oppositely, this low level signal is controlled first switching tube 45 and is turn-offed, thereby is turn-offed by the discharge path that first switching tube 45, the 3rd resistance R 3 and outputting inductance L constitute; When the output feedback signal of output feedback end FB output is higher than reference voltage REF, second comparator, 41 output low levels, and then RS latch 42 output low levels, be converted to high level through not gate 43 after oppositely, this high level signal is controlled first switching tube 45 and is opened, thereby, the electric weight that stores among the actual output VOUT is discharged over the ground by the 3rd resistance R 3 and outputting inductance L by the discharge path conducting that first switching tube 45, the 3rd resistance R 3 and outputting inductance L constitute.
In addition; described control unit 320 can also be realized by d type flip flop and not gate; in the protective circuit of switch power source as shown in Figure 5; only be with protective circuit of switch power source difference shown in Figure 4: RS latch 42 is replaced with d type flip flop 44; wherein; d type flip flop 44 triggers for rising edge, R end high level zero clearing output, and low level is invalid.Concrete syndeton is:
The CLK end of d type flip flop 44 connects the output of second comparator 41, and the R end connects Enable Pin EN, D termination power VIN, the input of output termination not gate 43.
The concrete operation principle of protective circuit of switch power source shown in Figure 5 is: the output initial state of second comparator 41 is set to low level, when output feedback signal during greater than reference voltage REF, 41 outputs of second comparator still are low level, d type flip flop 44 output low levels are opened through not gate 43 reverse back control first switching tubes 45; When output feedback signal during, second comparator, 41 output high level less than reference voltage REF, d type flip flop 44 output high level, through not gate 43 oppositely back control first switching tube 45 turn-off.
The protective circuit of Switching Power Supply of the present invention makes Switching Power Supply all be operated under the complete closed-loop control in whole starting process; and; before starting, Switching Power Supply promptly can detect and the output SW by Switching Power Supply discharges to the electric charge that actual output VOUT stores the output voltage V out among the actual output VOUT; the problem that described state of the prior art switches can not appear; and, the problem that overshoot may take place for output voltage V out in the described adjustment process can not appear yet.The output voltage V out of actual output VOUT in the embodiment of the invention can realize the smooth transition of Switching Power Supply from the soft start to the operate as normal since 0 normal complete startup; And this protective circuit realizes simple relatively, is easy to realize.
This method is discharged to the actual output VOUT of Switching Power Supply charge stored by outputting inductance L from the SW point, rather than directly by actual output VOUT discharge, has increased the damping coefficient of discharge on the one hand; Avoided the Switching Power Supply of adjustable output not have the VOUT port and can't make this protective circuit can be applied to fixing output and two kinds of Switching Power Supplies of adjustable output simultaneously by the problem of the direct discharge of actual output VOUT on the other hand, range of application be more extensive.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. the protective circuit of a Switching Power Supply is characterized in that, comprising:
Detecting unit is used for the output feedback signal and the preset reference voltage of Switching Power Supply are compared, according to corresponding generation high level of comparative result or low level level signal;
Control unit is used for generating control signal according to the level signal of detecting unit generation and the enable signal of Switching Power Supply;
Discharge cell is used for the control signal according to the control unit generation, the conducting or the shutoff of the pairing discharge path over the ground of actual output of control switching.
2. circuit according to claim 1 is characterized in that detecting unit specifically is used for: when output feedback signal during less than preset reference voltage, generate high level signal; When output feedback signal during, generate low level signal greater than preset reference voltage.
3. circuit according to claim 1 and 2 is characterized in that control unit specifically is used for:
When detecting unit generates high level signal, when described enable signal is low level signal, generate low level control signal; When detecting unit generates low level signal, when described enable signal is low level signal, generate the control signal of high level.
4. circuit according to claim 3 is characterized in that, described discharge cell specifically is used for:
When described control signal is high level, control the conducting of the pairing discharge path over the ground of actual output; When described control signal is low level, controls the pairing discharge path over the ground of actual output and turn-off.
5. circuit according to claim 2 is characterized in that, described detecting unit is realized that by second comparator normal phase input end of described second comparator connects described preset reference voltage, and negative-phase input connects the output feedback end of Switching Power Supply; The output of described second comparator is exported described level signal.
6. circuit according to claim 3 is characterized in that described control unit comprises RS latch and not gate; Wherein,
The output of RS latch S end joint detection unit, the R end connects enable signal, and the output of RS latch connects the input of described not gate, and the output of described not gate is exported described control signal.
7. circuit according to claim 3 is characterized in that described control unit comprises d type flip flop and not gate; Wherein,
The D end of d type flip flop connects supply voltage, the output of CLK end joint detection unit, and the R end connects enable signal, and output connects the input of described not gate, and the output of described not gate is exported described control signal.
8. circuit according to claim 4 is characterized in that, described discharge cell comprises: first switching tube, the 3rd resistance and outputting inductance; Wherein,
The grid of first switching tube connects the output of described control unit, source ground, and drain electrode connects the output of described Switching Power Supply by the 3rd resistance; The output of described Switching Power Supply connects the actual output of Switching Power Supply by outputting inductance.
CN 201010123855 2010-03-11 2010-03-11 Protection circuit of switch power supply Expired - Fee Related CN101800467B (en)

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CN103311892A (en) * 2012-03-12 2013-09-18 上海华虹集成电路有限责任公司 Protection circuit for switch power supply
CN103617995A (en) * 2013-11-25 2014-03-05 苏州贝克微电子有限公司 Power source voltage load dump protective circuit
CN106549641A (en) * 2015-09-16 2017-03-29 中兴通讯股份有限公司 A kind of protection circuit
CN113067470A (en) * 2021-06-02 2021-07-02 上海芯龙半导体技术股份有限公司 Enabling circuit for switching power supply chip, switching power supply chip and control method

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CN101389174A (en) * 2007-09-12 2009-03-18 罗姆股份有限公司 Inverter and control circuit, control method and luminescent device using the same
CN101568893A (en) * 2005-09-19 2009-10-28 德克萨斯仪器股份有限公司 Soft-start circuit and method for power-up of an amplifier circuit

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CN1592059A (en) * 2002-07-09 2005-03-09 罗姆股份有限公司 DC/DC converter
US20040070382A1 (en) * 2002-09-06 2004-04-15 Intersil Americas Inc. Synchronization of multiphase synthetic ripple voltage regulator
US7254000B1 (en) * 2005-06-20 2007-08-07 Nexem, Inc. Over voltage protection scheme for synchronous buck converter
CN101568893A (en) * 2005-09-19 2009-10-28 德克萨斯仪器股份有限公司 Soft-start circuit and method for power-up of an amplifier circuit
CN101373926A (en) * 2007-08-24 2009-02-25 尼克森微电子股份有限公司 Pulse-width modulation controller for switching voltage stabilizer
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594111A (en) * 2012-02-24 2012-07-18 中兴通讯股份有限公司 Quick discharge circuit
WO2013123724A1 (en) * 2012-02-24 2013-08-29 中兴通讯股份有限公司 Quick discharge circuit
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CN103311892A (en) * 2012-03-12 2013-09-18 上海华虹集成电路有限责任公司 Protection circuit for switch power supply
CN103617995A (en) * 2013-11-25 2014-03-05 苏州贝克微电子有限公司 Power source voltage load dump protective circuit
CN106549641A (en) * 2015-09-16 2017-03-29 中兴通讯股份有限公司 A kind of protection circuit
CN106549641B (en) * 2015-09-16 2021-07-06 中兴通讯股份有限公司 Protective circuit
CN113067470A (en) * 2021-06-02 2021-07-02 上海芯龙半导体技术股份有限公司 Enabling circuit for switching power supply chip, switching power supply chip and control method
CN113067470B (en) * 2021-06-02 2021-08-17 上海芯龙半导体技术股份有限公司 Enabling circuit for switching power supply chip, switching power supply chip and control method

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