CN102055311B - Linear voltage-stabilized power supply device and soft start method thereof - Google Patents
Linear voltage-stabilized power supply device and soft start method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of power supply and discloses a linear voltage-stabilized power supply device and a soft start method thereof. In the linear voltage-stabilized power supply device, at least two current-limiting branch circuits are arranged between a power supply input end and a power supply output end; a capacitor at the output end is charged and a load in an output circuit is powered by a gradually increased current by enabling the current-limiting branch circuits step by step; after an output voltage rises to a certain value, the linear voltage-stabilized power supply device enables a linear voltage-stabilized circuit and shuts down the current-limiting branch circuits so as to relieve or prevent an impact current at the start moment of the linear voltage-stabilized power supply device.
Description
Technical field
The present invention relates to power technique fields, particularly the soft Starting Technology of linear stabilized power supply device.
Background technology
Stabilized voltage power supply is divided into linear stabilized power supply and switching power supply usually.The characteristics of linear stabilized power supply have been that the device of voltage adjustment function always works in linear amplification region, thereby have good ripple and dynamic response characteristic.Fig. 1 is the fundamental block diagram of traditional linear stabilized power supply.It is by power input 01, voltage stabilizing circuit 02, power output end 03 and enable 04 4 parts of control circuit and form.
Fig. 2 is a physical circuit figure example.Enable control circuit 04 and control the open and close of this voltage stabilizing circuit by enable signal Enable, effective when Enable is high level.Whole circuit working process is as follows: as Enable during by low uprising, linear stabilized power supply is started working, power input to capacitor C 2 chargings in the power output circuit and to the power supply of the load RL in the output circuit, causes the moment impact electric current of power input appearance shown in Fig. 3 dotted line by voltage stabilizing circuit.
So large moment impact electric current may burn out circuit and cabling, also the voltage of power input can be dragged down, and shown in VIN voltage signal among Fig. 3, causes other circuit by the power input power supply to occur unstable even can't work on.Therefore in linear stabilized power supply, need to arrange the soft starting circuit that prevents impulse current, but with the operation of the input normal reliable that guarantees linear stabilized power supply.Soft start (softstart) refers to, when needs are powered to external equipment by power supply, power supply must be controlled the power on speed of (power up) of its out-put supply, out-put supply is slowly increased, to alleviate the pressure of various power supply components and parts in initial a period of time.
In order to solve the problem of moment impact electric current, publication number is that the Chinese patent of CN 101207327A has proposed a kind of soft starting device of power supply.This soft starting device of power supply comprises power input, minute voltage regulator circuit, the first delay circuit, the first switching circuit, the second delay circuit, second switch circuit and power output end.Minute voltage regulator circuit is used for leading from the input current of power input the first delay circuit, and provides the first cut-in voltage for the first switching circuit; The first delay circuit is used for receiving input current and carries out deferred action; The first switching circuit is used for after the first delay circuit deferred action is finished, and receives the first cut-in voltage and opens, and the second delay circuit and provide the second cut-in voltage for the second switch circuit simultaneously leads input current; The second delay circuit is used for receiving input current and carries out deferred action; The second switch circuit is used for after the second delay circuit deferred action is finished, and receives the second cut-in voltage and opens, and the power output end that simultaneously input current led is with output.The basic principle block diagram of this device as shown in Figure 4, physical circuit figure example is as shown in Figure 5.
The shortcoming of this patented technology scheme is, the input current of power input is through 2 grades of power output ends that just lead of delaying time, although the impulse current of input in the time of can preventing from starting, but when real work, delay circuit may cause the response speed of whole circuit slack-off, is unfavorable for the application when the output large load current changes.In addition, resistance capacitance is too much in the control circuit, and the RC effect may make output unstable under certain load current, and output voltage produces concussion easily.Moreover electric capacity and voltage stabilizing didoe all should not be integrated on the silicon chip, and whole soft starting device can't be realized integrated.
Summary of the invention
The object of the present invention is to provide a kind of linear stabilized power supply device and soft-start method thereof, can alleviate or prevent that the linear voltage stabilization source from starting the impulse current of moment, and response is very fast, output voltage stabilization is suitable for being integrated into silicon chip.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of linear stabilized power supply device, comprising: power input, power output end and be connected to linear voltage-stabilizing circuit between this power input and the power output end also comprise:
N current limliting branch road is connected between power input and the power output end with parallel way, and the electric current that each current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit, and N is the integer greater than 1;
Enable control circuit, be used for when device starts, enabling successively each current limliting branch road with predetermined time-delay;
Whether output voltage detecting circuit reaches predetermined value for detection of output voltage or its component, if reach then enable linear voltage-stabilizing circuit.
Embodiments of the present invention also provide a kind of linear stabilized power supply device soft-start method, may further comprise the steps:
Enable successively N current limliting branch road with predetermined time-delay, N current limliting branch road is connected between power input and the power output end with parallel way, and N is the integer greater than 1;
Detect output voltage or its component and whether reach predetermined value, if reach then enable directly or indirectly to be connected to linear voltage-stabilizing circuit between power input and the power output end, the electric current that each current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
At least two current limliting branch roads are set between power input and power output end, enable step by step each current limliting branch road, with the electric current that increases gradually to the output capacitor charging and to the load supplying in the output circuit, rise to and enable again linear voltage-stabilizing circuit after the certain value Deng output voltage, thereby prevented that the moment that enables linear voltage-stabilizing circuit from producing the moment impact electric current at power input, make power input keep stable, guaranteed that other circuit that link to each other with power input still can the operation of normal reliable ground.Whole power supply is once starting the output that begins to have voltage and current, and response speed is very fast, can not use electric capacity in the control circuit, even make output also can keep stable under larger load current, output voltage is not easy to produce concussion.Because can not use electric capacity and voltage stabilizing didoe, thus this linear stabilized power supply device be suitable for being integrated on the silicon chip, thereby cost can reduce greatly when producing in enormous quantities.
Further, after linear voltage-stabilizing circuit is enabled, close each current source circuit, can make whole stabilized voltage supply device enter normal operating conditions.
Further, the available electric current of each current source circuit is no more than 1/10th of linear voltage-stabilizing circuit electric current, and output current and voltage are risen in comparatively mild mode, has further alleviated the amplitude of impulse current.
Further, 3,4 current source circuits are set, can prevent linear voltage-stabilizing circuit and enable the rear situation appearance that also has the part current source circuit not to be enabled, prevent that the part current source circuit is wasted.
Further, the feedback voltage of the detection voltage ratio linear voltage-stabilizing circuit of output voltage detecting circuit is lower slightly, can prevent from causing the output voltage overshoot in the moment that enables linear voltage-stabilizing circuit.
Further, the voltage feedback circuit common sparing circuit of output voltage detecting circuit and linear voltage-stabilizing circuit can be saved total integrated circuit area.The formation of reference voltage needs a plurality of elements usually, output voltage detecting circuit and linear voltage-stabilizing circuit share same reference voltage, can save many elements, only need to increase a resistance and just on same branch road, obtained simultaneously the detection voltage of output voltage detecting circuit and the feedback voltage of linear voltage-stabilizing circuit, further save element, reduced cost.
Description of drawings
Fig. 1 is the fundamental block diagram of traditional linear stabilized power supply;
Fig. 2 is an example circuit diagram of prior art neutral line stabilized voltage power supply;
Fig. 3 is the electric current of prior art neutral line stabilized voltage power supply and the schematic diagram of voltage temporal evolution situation when starting;
Fig. 4 is soft starting device of power supply basic principle block diagram in the existing patented technology;
Fig. 5 is soft starting device of power supply physical circuit figure example in the existing patented technology;
Fig. 6 is first embodiment of the invention neutral line stabilized voltage supply device theory diagram;
Fig. 7 is second embodiment of the invention neutral line stabilized voltage supply device theory diagram;
Fig. 8 is a physical circuit figure of second embodiment of the invention neutral line stabilized voltage supply device;
Fig. 9 is the control sequential chart of second embodiment of the invention neutral line stabilized voltage supply device;
Figure 10 is input current/voltage and output end voltage variation diagram in the second embodiment of the invention;
Figure 11 is third embodiment of the invention neutral line stabilized voltage supply device theory diagram;
Figure 12 is a physical circuit figure of third embodiment of the invention neutral line stabilized voltage supply device;
Figure 13 is the control sequential chart of third embodiment of the invention neutral line stabilized voltage supply device;
Figure 14 is input current/voltage and output end voltage variation diagram in the third embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of linear stabilized power supply device, its structure as shown in Figure 6, the dotted line among the figure represents enable signal.This linear stabilized power supply device comprises:
Power input, power output end, linear voltage-stabilizing circuit, a N current limliting branch road, enable control circuit and output voltage detecting circuit.
Linear voltage-stabilizing circuit is connected between this power input and the power output end, plays the effect of exporting in normal operation electric current of voltage regulation.
N current limliting branch road (the current limliting branch road 1 among Fig. 6, current limliting branch road 2 ..., current limliting branch road N), be connected between power input and the power output end with parallel way, the electric current that each current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit, and N is the integer greater than 1.The way of realization of current limliting branch road can be diversified, as long as can realize that the function of current limliting is just passable.In the second and the 3rd execution mode, proposed the specific implementation form of two kinds of current limliting branch roads, but the current limliting branch road among the present invention is not limited to this two kinds of concrete forms.
Whether output voltage detecting circuit reaches predetermined value for detection of output voltage or its component, if reach then enable directly or indirectly linear voltage-stabilizing circuit.
Enable control circuit, be used for when device starts, enabling successively each current limliting branch road with predetermined time-delay.
Enable control circuit and also have the function that enables linear voltage-stabilizing circuit, it enables linear voltage-stabilizing circuit can use direct or indirect mode, output voltage detecting circuit has been shown among Fig. 6 has indirectly enabled linear voltage-stabilizing circuit by enabling control circuit.Certainly, in other execution mode of the present invention, output voltage detecting circuit also can directly enable linear voltage-stabilizing circuit.
At least two current limliting branch roads are set between power input and power output end, enable step by step each current limliting branch road, with the electric current that increases gradually to the output capacitor charging and to the load supplying in the output circuit, rise to and enable again linear voltage-stabilizing circuit after the certain value Deng output voltage, thereby prevented that the moment that enables linear voltage-stabilizing circuit from producing the moment impact electric current at power input, make power input keep stable, guaranteed that other circuit that link to each other with power input still can the operation of normal reliable ground.Whole power supply is once starting the output that begins to have voltage and current, and response speed is very fast, can not use electric capacity in the control circuit, even make output also can keep stable under larger load current, output voltage is not easy to produce concussion.Because can not use electric capacity and voltage stabilizing didoe, thus this linear stabilized power supply device be suitable for being integrated on the silicon chip, thereby cost can reduce greatly when producing in enormous quantities.
Second embodiment of the invention relates to a kind of linear stabilized power supply device.
The second execution mode is a kind of version of the first execution mode, and its characteristics are to use current source circuit as the current limliting branch road.
The theory diagram of the second execution mode as shown in Figure 7, this property stabilized voltage supply device comprises:
Power input 10, linear voltage-stabilizing circuit 20, power output end 30, a N current source circuit (4011 to 401N), enable control circuit 40 and output voltage detecting circuit 50.
Power input 10 is power supply sources of whole linear stabilized power supply, usually with an electric capacity, plays filtering and voltage stabilizing.
Linear voltage-stabilizing circuit 20 is conventional linear voltage stabilizing circuits, can provide a stable voltage to output when the certain load current of output band.
Power output end 30 is stable Voltage-outputs.
N current source circuit (4011 to 401N) is connected between power input and the power output end with parallel way.The available size of current of each current source circuit can be identical, also can be different.Current source circuit is a kind of prior art, and multiple implementation can be arranged, and concrete implementation can find in the relevant textbook of university, has not been described in detail here.
Preferably, the available electric current of each current source circuit all is no more than 1/10th of linear voltage-stabilizing circuit output current.Output current and voltage are risen in comparatively mild mode, further alleviate the amplitude of impulse current.
Preferably, the number of current source circuit is 3 or 4.It is a kind of better configurations that 3,4 current source circuits are set, and can prevent linear voltage-stabilizing circuit and enable the rear situation appearance that also has the part current source circuit not to be enabled, and prevents that the part current source circuit is wasted.In addition, be appreciated that the number of current source circuit also can be 2, or more than 4.
Enabling control circuit 40 comprises:
Linear voltage-stabilizing circuit enable circuits 400 is used for enabling or closing linear voltage-stabilizing circuit.
N current source enable circuits is respectively applied to enable or closes N current source circuit.Enable a current source and belong to prior art, do not described in detail here.Be the first current source enable circuits EN4011, the second current source enable circuits EN4012 among Fig. 7 ... and N current source enable circuits EN401N.A kind of form of expression of current source enable circuits is N electronic switch (for example can realize with switching transistor or field effect transistor), and " enabling sequential control circuit " is by N current source circuit of this N electronic switch control.
Enable sequential control circuit 402, be used for utilizing N current source enable circuits, when device starts, enable successively N current source circuit with predetermined time-delay.When enabling successively each current source circuit, the time-delay that each current source circuit is enabled can be identical, also can be different.For example, there are 3 road current source circuits (current source 1, current source 2 and current source 3) to be enabled successively.Time-delay between current source 1 and the current source 2 is T1, and the time-delay between the current source 2 and 3 is T2, and T1 can equal T2, and T1 also can be not equal to T2.
Enable control circuit 40 and also be used for after linear voltage-stabilizing circuit is enabled, closing each current source circuit.After linear voltage-stabilizing circuit is enabled, close each current source circuit, can make whole stabilized voltage supply device enter normal operating conditions.Preferably, enable control circuit after linear voltage-stabilizing circuit is enabled, through one section predetermined time-delay, close again each current source circuit first.
Whether output voltage detecting circuit 50 reaches predetermined value for detection of output voltage or its component, if reach then enable directly or indirectly linear voltage-stabilizing circuit 20.In the present embodiment, output voltage detecting circuit 50 is realized enabling of linear voltage-stabilizing circuit 20 by linear voltage-stabilizing circuit enable circuits 400 indirectly.
Fig. 8 is a physical circuit figure of present embodiment.Fig. 9 then shows the control sequential chart of whole linear stabilized power supply soft start.Set forth the course of work of whole circuit below in conjunction with Fig. 8 and Fig. 9.
Enable signal Enable is connected to as an input signal and enables sequential control circuit 402.When the Enable signal becomes when high from low, namely become when effective from invalid, enabling sequential control circuit 402 its output signal of control EN4011_Control uprises from low, and be sent to the first current source enable circuits EN4011 and control the first current source circuit 4011 and start working, reach the power supply to load RL for 2 chargings of power output end capacitor C, power output end voltage VOUT begins to raise.
After the time-delay of Tdelay1 after a while, enabling sequential control circuit 402 its output signal of control EN4012_Control uprises from low, and be sent to the second current source enable circuits EN4012 and control the second current source circuit 4012 and start working, this moment, the first current source circuit 4011 and the second current source circuit 4012 reached the power supply to load RL for simultaneously 2 chargings of power output end capacitor C, and power output end voltage VOUT rises to higher magnitude of voltage.
Again after the time-delay of Tdelay2 after a while, enabling sequential control circuit 402 its output signal of control EN4013_Control uprises from low, and be sent to the 3rd current source enable circuits EN4013 and control the 3rd current source circuit 4013 and start working, this moment, the first current source circuit 4011 and the second current source circuit 4012 and the 3rd current source circuit 4013 reached the power supply to load RL for simultaneously 2 chargings of power output end capacitor C, and power output end voltage rises to higher magnitude of voltage.
Again after the time-delay of TdelayN after a while, enabling sequential control circuit 402 its output signal of control EN401N_Control uprises from low, and be sent to N current source enable circuits EN401N and control N current source circuit 401N and start working, the first current source circuit 4011, the second current source circuit 4012, the 3rd current source circuit 4013 and N current source circuit 401N give simultaneously 2 chargings of power output end capacitor C and power to load RL at this moment, and power output end voltage rises to higher magnitude of voltage.
Be enabled gradually to the output capacitance charging with in the output load supplying at current source circuit, output voltage detecting circuit 50 detects output end voltage, and with its partial pressure value V2 and reference voltage Vref comparison, when determining output end voltage partial pressure value V2 greater than reference voltage Vref, the EN_Control signal is uprised by low, and is communicated to and enables sequential control circuit 402.
When enable sequential control circuit 402 receive the EN_Control signal by low uprising after, enabling sequential control circuit 402 its output signal of control EN400_Control uprises from low, and be sent to linear voltage-stabilizing circuit and enable control circuit 400, thereby enable linear voltage-stabilizing circuit 20, linear voltage-stabilizing circuit is started working, and provides electric current supply and voltage stabilizing function to output.
So far, whole soft start-up process finishes.
Figure 10 shows input current/voltage and the output end voltage variation diagram of present embodiment.
Preferably, the detection voltage of output voltage detecting circuit can prevent from causing the output voltage overshoot in the moment that enables linear voltage-stabilizing circuit preferably a little less than the feedback voltage of linear voltage-stabilizing circuit like this.A kind of preferably implementation as shown in Figure 8.V1 is the feedback voltage of linear voltage-stabilizing circuit among Fig. 8, and V2 is the detection voltage of output voltage detecting circuit, by choosing successively V1 and V2 on the branch road that consists of at R1, R2 and R3, can realize V1＞V2.
When V2 is more lower slightly than V1, current source circuit output voltage VO UT can be charged to than application demand voltage slightly height a bit (as for height what, depend on the scale of R2 resistance and other resistance, be controlled), again linear voltage-stabilizing circuit is enabled at this moment.Even linear voltage-stabilizing circuit has been enabled, but because VOUT voltage has been higher than application demand voltage, so voltage-stabiliser tube is in by state, until the voltage on the VOUT has been lower than application demand voltage owing to load drops to, linear voltage-stabilizing circuit just can enter voltage stabilizing and regulate the stage, can find out, output voltage VO UT is exactly the global voltage that is added on R1, R2, the R3, and detection voltage V2 is the proportional component of output voltage VO UT, V2=Vout* (R2+R3)/(R1+R2+R3).Certainly, in other execution mode of the present invention, also can use VOUT whole as detecting voltage.
If V2 is higher than V1, so when current source circuit with output voltage VO UT be charged to than application demand voltage more lower slightly the time, will enable linear voltage-stabilizing circuit.Because output voltage is lower than application demand voltage, so at once conducting of voltage-stabiliser tube.The transient switching of voltage-stabiliser tube may cause the output end voltage overshoot, because On current is uncontrollable, so the overshoot voltage amount can not be controlled.V2 must be more many than the V1 height, and On current and overshoot voltage amount are larger.
In order to guarantee that current source circuit can be not too many with the VOUT overshoot, will note the ratio value of R2 resistance and other R1, R3 resistance.Choose by the resistance of R1, R2, R3 and can control VOUT overshoot voltage amount.General warranty VOUT overshoot voltage is controlled at 10-50mV take interior as best.
Such as reference voltage Vref=1V, application demand voltage is 3V, and R1 gets 200K, so (R2+R3)/1V=R1/ (3V-1V)-＞(R2+R3)=100K, when R2/R3=1/100, can control the VOUT overshoot voltage is 30.3mV.
And for example: reference voltage Vref=1.5V, application demand voltage is 3V, R1 gets 200K, so (R2+R3)/1.5V=R1/ (3V-1.5V)-＞(R2+R3)=200K, when R2/R3=1/199, can control the VOUT overshoot voltage is 15mV.
In the electrograph of Fig. 8, output voltage detecting circuit and linear voltage-stabilizing circuit use same reference voltage.And the detection voltage V2 of output voltage detecting circuit and the feedback voltage V 2 of linear voltage-stabilizing circuit are obtained from same branch road (being made of R1, R2 and R3).
The voltage feedback circuit common sparing circuit of output voltage detecting circuit and linear voltage-stabilizing circuit can be saved total integrated circuit area.The formation of reference voltage needs a plurality of elements usually, output voltage detecting circuit and linear voltage-stabilizing circuit share same reference voltage, can save many elements, only need to increase a resistance and just on same branch road, obtain simultaneously the detection voltage of output voltage detecting circuit and the feedback voltage of linear voltage-stabilizing circuit, further saved element.
Third embodiment of the invention relates to a kind of linear stabilized power supply device.
The 3rd execution mode is the another kind of version of the first execution mode, its characteristics have been to use N voltage-stabiliser tube in parallel in linear voltage-stabilizing circuit, and this N voltage-stabiliser tube doubles as N current limliting branch road simultaneously, that is to say, N the voltage-stabiliser tube that N current limliting propped up in the route linear voltage-stabilizing circuit realized.
The theory diagram of the 3rd execution mode as shown in figure 11, this property stabilized voltage supply device comprises:
Linear voltage-stabilizing circuit 200 is compared with the conventional linear voltage stabilizing circuit, difference is that linear voltage-stabilizing circuit 200 forms (N is more than or equal to 2) by N road voltage-stabiliser tube, by the control of discharge circuit (being operational amplifier), can be so that can provide a stable voltage during the certain load current of output band.This N voltage-stabiliser tube doubles as N current limliting branch road.
Enable control circuit 4000 by the multipath voltage regulation pipe enable control circuit 4001,4,003 three modules of control circuit that enable that enable sequential control circuit 4002 and discharge circuit form.
It is N voltage-stabiliser tube enable circuits that the multipath voltage regulation pipe enables control circuit 4001, is respectively applied to enable N as the voltage-stabiliser tube of current limliting branch road.
Enable sequential control circuit 4002, be used for utilizing N voltage-stabiliser tube enable circuits, when device starts, enable successively N voltage-stabiliser tube with predetermined time-delay.
Discharge circuit enable control circuit 4003, be used for enabling or close the discharge circuit of linear voltage-stabilizing circuit, thereby enable or close linear voltage-stabilizing circuit.Output voltage detecting circuit is when detecting output voltage or its component and reach predetermined value, and the control circuit that enables by discharge circuit enables linear voltage-stabilizing circuit indirectly.
Whether output voltage detecting circuit 500 reaches predetermined value for detection of output voltage or its component, if reach then enable directly or indirectly linear voltage-stabilizing circuit 200.
The 3rd execution mode improves on the basis of the first execution mode, main improvements are: linear voltage-stabilizing circuit comprises N voltage-stabiliser tube and a discharge circuit, the output of this discharge circuit is connected with the grid of N voltage-stabiliser tube, and the source electrode of N voltage-stabiliser tube and drain electrode are connected between power input and the power output end with parallel way.
Figure 12 is a physical circuit figure of present embodiment.Figure 13 then shows the control sequential chart of whole linear stabilized power supply soft start.Set forth the course of work of whole circuit below in conjunction with Figure 12 and Figure 13.
Enable signal Enable is connected to as an input signal and enables sequential control circuit 4002.When the Enable signal becomes when high from low, namely become when effective from invalid, enabling sequential control circuit 4002 its output signal of control EN_C1 uprises from low, and be sent to first via voltage-stabiliser tube enable circuits and control first via voltage-stabiliser tube Q1 and start working, reach the power supply to load RL for 2 chargings of power output end capacitor C, power output end voltage begins to raise.
After the time-delay of TdelayQ 1 after a while, enabling sequential control circuit 4002 its output signal of control EN_C2 uprises from low, and be sent to the second road voltage-stabiliser tube enable circuits and control the second road voltage-stabiliser tube Q2 and start working, this moment, first via voltage-stabiliser tube Q1 and first via voltage-stabiliser tube Q2 reached the power supply to load RL for simultaneously 2 chargings of power output end capacitor C, and power output end voltage rises to higher magnitude of voltage.
Again after the time-delay of TdelayQN after a while, enabling sequential control circuit 4002 its output signal of control EN_CN uprises from low, and be sent to N road voltage-stabiliser tube enable circuits and control N road voltage-stabiliser tube QN and start working, first via voltage-stabiliser tube Q1, the second road voltage-stabiliser tube Q2 and N road voltage-stabiliser tube QN give simultaneously 2 chargings of power output end capacitor C and power to load RL at this moment, and power output end voltage rises to higher magnitude of voltage.
Be enabled gradually to the output capacitance charging with in the output load supplying at the multipath voltage regulation pipe, output voltage detecting circuit 500 detects output end voltage, and with its partial pressure value V2 and reference voltage Vref comparison, when determining output end voltage partial pressure value V2 greater than reference voltage Vref, the EN_C signal is uprised by low, and is communicated to and enables sequential control circuit 4002.
When enable sequential control circuit 4002 receive the EN_C signal by low uprising after, through certain time-delay TdelayA, enable sequential control circuit 4002 control its output signal EN_C1 EN_C2 and EN_CN by high step-down, the control that enables that is the multipath voltage regulation pipe was lost efficacy, and the control of Q1～QN is in floating dummy status.(TdelayB is generally less than 2 microseconds through very short time-delay TdelayB again, but be not limited to this concrete data) after, EN_A1 uprises from low, and be sent to discharge circuit enable control circuit 4003, thereby enable discharge circuit, by the control of discharge circuit, provide electric current supply and voltage stabilizing function to output.
So far, whole soft start-up process finishes.
In the circuit diagram of Figure 13, the voltage-stabiliser tube enable circuits comprises a field effect transistor, the source electrode of this field effect transistor is connected with the grid of a voltage-stabiliser tube, grounded drain, grid is connected with a control signal that enables sequential control circuit, be used for when the control signal that enables sequential control circuit uprises from hanging down, controlling corresponding voltage-stabiliser tube and starting working.Be appreciated that the voltage-stabiliser tube enable circuits also can form with other element, for example use the switch triode, as long as it is just passable to enable corresponding voltage-stabiliser tube according to the control signal that enables sequential control circuit.
Figure 14 shows input current/voltage and output end voltage variation diagram in the 3rd execution mode, reaches essentially identical effect with the first execution mode.
Preferably, the detection voltage of output voltage detecting circuit is lower than the feedback voltage of linear voltage-stabilizing circuit, can prevent from like this causing the output voltage overshoot in the moment that enables linear voltage-stabilizing circuit.A kind of preferably implementation as shown in figure 12.V1 is the feedback voltage of linear voltage-stabilizing circuit among Figure 12, and V2 is the detection voltage of output voltage detecting circuit, by choosing successively V1 and V2 on the branch road that consists of at R1, R2 and R3, can realize V1＞V2.
When V2 is more lower slightly than V1, multipath voltage regulation pipe circuit output voltage VO UT can be charged to than application demand voltage slightly height a bit (as for height what, depend on the scale of R2 resistance and other resistance, be controlled), again linear voltage-stabilizing circuit is enabled at this moment.Even linear voltage-stabilizing circuit has been enabled, but because VOUT voltage has been higher than application demand voltage, so voltage-stabiliser tube is in by state, until the voltage on the VOUT has been lower than application demand voltage owing to load drops to, linear voltage-stabilizing circuit just can enter voltage stabilizing and regulate the stage.
In order to guarantee that multipath voltage regulation pipe circuit can be not too many with the VOUT overshoot, will note the ratio value of R2 resistance and other R1, R3 resistance.Choose by the resistance of R1, R2, R3 and can control VOUT overshoot voltage amount.General warranty VOUT overshoot voltage is controlled at 10-50mV take interior as best.
Four embodiment of the invention relates to a kind of linear stabilized power supply device soft-start method, may further comprise the steps:
Enable successively N current limliting branch road with predetermined time-delay, N current limliting branch road is connected between power input and the power output end with parallel way, and N is the integer greater than 1.
Detect output voltage or its component and whether reach predetermined value, if reach then enable directly or indirectly to be connected to linear voltage-stabilizing circuit between power input and the power output end, the electric current that each current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit.
The step of above-mentioned detection can walk abreast with the step that enables successively N current limliting branch road, that is to say, when possible N current limliting branch road do not enabled fully, will be detected output voltage or its component reaches predetermined value, thereby linear voltage-stabilizing circuit is enabled.
After linear voltage-stabilizing circuit was enabled, the current limliting branch road generally was closed, such as the situation in the second execution mode (the current limliting branch road is current source circuit).If the current limliting branch road is used as the part of linear voltage-stabilizing circuit simultaneously, then can close the current limliting branch road, such as the situation in the 3rd execution mode.
Present embodiment is the method execution mode corresponding with the first to the 3rd execution mode, present embodiment can with the enforcement of working in coordination of the first to the 3rd execution mode.The correlation technique details of mentioning in the first to the 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in the first to the 3rd execution mode.
In each execution mode of the present invention, " enabling " is Enable, and opposite state Disable is called as " closing ".Enable and Disable also may have other Chinese to express, but implication is the same.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (17)
1. linear stabilized power supply device comprises: power input, power output end and be connected to linear voltage-stabilizing circuit between this power input and the power output end, it is characterized in that, and also comprise:
N current limliting branch road is connected between described power input and the power output end with parallel way, and the electric current that each current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit, and N is the integer greater than 1;
Enable control circuit, be used for when described device starts, enabling successively each described current limliting branch road with predetermined time-delay;
Whether output voltage detecting circuit reaches predetermined value for detection of output voltage or its proportional component of power output end, if reach then enable described linear voltage-stabilizing circuit.
2. linear stabilized power supply device according to claim 1 is characterized in that, described current limliting branch road is current source circuit.
3. linear stabilized power supply device according to claim 2 is characterized in that, the described control circuit that enables also is used for cutting out each described current source circuit after described linear voltage-stabilizing circuit is enabled.
4. linear stabilized power supply device according to claim 3 is characterized in that, the described control circuit that enables through one section predetermined time-delay, cuts out each described current source circuit first again after described linear voltage-stabilizing circuit is enabled.
5. linear stabilized power supply device according to claim 4 is characterized in that, the available electric current of each described current source circuit all is no more than 1/10th of described linear voltage-stabilizing circuit output current.
6. linear stabilized power supply device according to claim 5 is characterized in that, the number of described current source circuit is 3 or 4.
7. linear stabilized power supply device according to claim 6 is characterized in that, the described control circuit that enables comprises:
N current source enable circuits is respectively applied to enable or closes N described current source circuit;
Enable sequential control circuit, be used for utilizing N described current source enable circuits, when described device starts, enable successively N described current source circuit with predetermined time-delay;
The linear voltage-stabilizing circuit enable circuits is used for enabling or closing described linear voltage-stabilizing circuit; Described output voltage detecting circuit enables described linear voltage-stabilizing circuit indirectly by described linear voltage-stabilizing circuit enable circuits when detecting output voltage or its component and reach predetermined value.
8. linear stabilized power supply device according to claim 1, it is characterized in that, described linear voltage-stabilizing circuit comprises N voltage-stabiliser tube and a discharge circuit, the output of this discharge circuit is connected with the grid of N voltage-stabiliser tube, N voltage-stabiliser tube is connected between described power input and the power output end with parallel way, wherein the source electrode of N voltage-stabiliser tube is connected to power input, and drain electrode is connected to power output end;
N the voltage-stabiliser tube that a described N current limliting is propped up in the described linear voltage-stabilizing circuit of route realized.
9. linear stabilized power supply device according to claim 8 is characterized in that, the available maximum current of each described voltage-stabiliser tube is the N/of described linear voltage-stabilizing circuit output current.
10. linear stabilized power supply device according to claim 9 is characterized in that, the described control circuit that enables comprises:
N voltage-stabiliser tube enable circuits is respectively applied to enable N as the described voltage-stabiliser tube of current limliting branch road;
Enable sequential control circuit, be used for utilizing N described voltage-stabiliser tube enable circuits, when described device starts, enable successively N described voltage-stabiliser tube with predetermined time-delay;
Discharge circuit enable control circuit, be used for enabling or close the discharge circuit of described linear voltage-stabilizing circuit, thereby enable or close described linear voltage-stabilizing circuit; Described output voltage detecting circuit is when detecting output voltage or its component and reach predetermined value, and the control circuit that enables by described discharge circuit enables described linear voltage-stabilizing circuit indirectly.
11. linear stabilized power supply device according to claim 10, it is characterized in that, each described voltage-stabiliser tube enable circuits comprises a field effect transistor, the source electrode of this field effect transistor is connected with the grid of a corresponding voltage-stabiliser tube, grounded drain, grid is connected with a described control signal that enables sequential control circuit, is used for enabling corresponding voltage-stabiliser tube and starting working when the described control signal that enables sequential control circuit uprises from hanging down.
12. each described linear stabilized power supply device in 11 is characterized in that the detection voltage that described output voltage detecting circuit detects is lower than feedback of feedback voltage in the described linear voltage-stabilizing circuit according to claim 1.
13. linear stabilized power supply device according to claim 12 is characterized in that, the difference of the detection voltage of described output voltage detecting circuit and the feedback voltage of described linear voltage-stabilizing circuit is in 10 to 50mV scope.
14. linear stabilized power supply device according to claim 13 is characterized in that, described output voltage detecting circuit and described linear voltage-stabilizing circuit use same reference voltage;
The detection voltage of described output voltage detecting circuit and the feedback voltage of described linear voltage-stabilizing circuit obtain from the same branch road.
15. a linear stabilized power supply device soft-start method is characterized in that described device comprises power input, power output end and linear voltage-stabilizing circuit, may further comprise the steps:
Enable successively N current limliting branch road with predetermined time-delay, described N current limliting branch road is connected between power input and the power output end with parallel way, and N is the integer greater than 1;
Detect output voltage or its component and whether reach predetermined value, if reach then enable directly or indirectly to be connected to linear voltage-stabilizing circuit between described power input and the power output end, the electric current that each described current limliting branch road can provide all is no more than 1/2 of the available electric current of linear voltage-stabilizing circuit.
16. linear stabilized power supply device soft-start method according to claim 15 is characterized in that described current limliting branch road is current source circuit;
Described method is further comprising the steps of:
After being enabled, described linear voltage-stabilizing circuit closes each described current source circuit.
17. linear stabilized power supply device soft-start method according to claim 15 is characterized in that described current limliting branch road is the voltage-stabiliser tube of current limiting function;
Described method is further comprising the steps of:
The voltage-stabiliser tube of described current limiting function linear voltage stabilization pipe as parallel connection after startup is finished is controlled simultaneously by the discharge circuit in the described linear voltage-stabilizing circuit.
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| CN 200910201735 CN102055311B (en) | 2009-10-29 | 2009-10-29 | Linear voltage-stabilized power supply device and soft start method thereof |
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| CN103178699B (en) * | 2013-02-28 | 2016-03-30 | 广东宽普科技股份有限公司 | Reduce the method for bounce frequency filter consume and adopt the bounce frequency filter of the method |
| US20150042296A1 (en) * | 2013-06-28 | 2015-02-12 | Sk Hynix Memory Solutions Inc. | Voltage regulator soft start |
| CN104113209B (en) * | 2014-08-07 | 2018-03-20 | 深圳市杰和科技发展有限公司 | A kind of power module for supporting Width funtion to input |
| CN104793688A (en) * | 2015-04-22 | 2015-07-22 | 无锡中普微电子有限公司 | Voltage regulator |
| CN107819348A (en) * | 2017-11-30 | 2018-03-20 | 惠州市蓝微新源技术有限公司 | The contactor control system and its control method of a kind of energy-accumulating power station |
| CN111162669B (en) * | 2019-12-13 | 2021-04-16 | 潍柴动力股份有限公司 | Sensor power supply soft start method and device, storage medium and electronic equipment |
| CN114156852B (en) * | 2021-11-30 | 2024-06-21 | 南京微盟电子有限公司 | Surge current control circuit of LDO linear voltage stabilizer |
| CN116430938B (en) * | 2023-06-12 | 2023-09-12 | 上海海栎创科技股份有限公司 | Soft start control module, system and method |
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