CN202713145U - Voltage reducing type power circuit - Google Patents
Voltage reducing type power circuit Download PDFInfo
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- CN202713145U CN202713145U CN 201220301756 CN201220301756U CN202713145U CN 202713145 U CN202713145 U CN 202713145U CN 201220301756 CN201220301756 CN 201220301756 CN 201220301756 U CN201220301756 U CN 201220301756U CN 202713145 U CN202713145 U CN 202713145U
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- controllable switch
- power circuit
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Abstract
The utility model discloses a voltage reducing type power circuit. The voltage reducing type power circuit comprises: a detection resistor which is serially connected with an inductor of an inductance-capacitance low-pass filter and located at one side of the inductor which is closer to an active controllable switch for detecting the magnitude of the current flowing through the inductor; and an auxiliary control unit which is connected with a control circuit and the detection resistor for generating a second PWM signal according to a first PWM signal provided by the control circuit and a signal provided by the detection resistor to control the switch-on and switch-off of the active controllable switch. Only when the signal provided by the detection resistor is reduced to a set low value, the auxiliary control unit allows the state of the active controllable switch switches from the off state to the on state. According to the utility model, the maximum working current capability required be born by components, such as a fly-wheel diode, the active controllable switch, the inductor, etc., can be controlled in a low range, so the cost can be reduced, and the reliability of the voltage reducing type power circuit can be improved.
Description
Technical field
The utility model relates to power circuit, and is especially relevant with the control of the active controllable switch of voltage-dropping type power circuit.
Background technology
Existing voltage-dropping type power circuit, referring to Fig. 1, generally include active controllable switch K1, in order to control the control unit KC0 of this active controllable switch K1 action, the low pass filter and the inductive current bleeder pipe D1 that are consisted of by inductance L 1 and capacitor C 1 that link to each other with this active controllable switch K1.This control unit KC0 then further comprises control circuit and the trigger that links to each other with this control circuit, and this control circuit can provide reseting controling signal and pulse-width control signal to this trigger and then control the break-make of this active controllable switch K1.Wherein, active controllable switch K1 can be the switching devices such as high-voltage three-pole pipe, high-voltage MOS pipe, IGBT.The basic functional principle of this voltage-dropping type power circuit roughly comprises: active controllable switch K1 is operated in the pulse-width adjustment state, and inductance L 1 and capacitor C 1 form low pass filter.The design principle of capacitor C 1 is little the arriving to a certain degree of ripple voltage of guaranteeing on the capacitor C 1.Because the switch frequency is very high, during the circuit steady operation, voltage on the capacitor C 1 is comprised of small ripple and larger DC component, consider the direct voltage Uo of capacitor charge and discharge causes in the switch periods ripple output on the capacitor C 1, so voltage can be considered as Constant Direct Current substantially on the capacitor C 1.Current i L on the inductance L 1 variable quantity in time is Δ iL=(UL/L1) * Δ t, when active controllable switch K1 is in conducting state, voltage U L=Ud-Uo on the inductance L 1, when active controllable switch K1 is in cut-off state, the voltage U L=-Uo on the inductance L 1.
Referring to Fig. 2, when active controllable switch K1 conducting, the voltage U L on the inductance L 1〉0, the current i L on the inductance L 1 increases, inductance L 1 energy storage is referring to Fig. 3, when active controllable switch K1 ends, voltage U L on the inductance L 1＜0, the current i L on the inductance L 1 reduces, and inductance L 1 is released energy.If before the current i L on the inductance L 1 is reduced to 0, make active controllable switch K1 switch to conducting state, then can there be electric current to flow through on the inductance L 1 always, this mode of operation is called CCM pattern (continuous current mode).
Say from theoretical, electric current on the inductance can produce magnetic linkage at inductance, the size of magnetic linkage is ψ=L*i, magnetic linkage is the energy storage form of inductance, and the energy size of its energy storage is W=L*i*i/2. (J), for the inductance L of determining, magnetic linkage has individual peak, if the magnetic linkage on the inductance surpasses this value, the inductance value of inductance will sharply descend, thereby can make system out of control.That is to say that to the inductance of determining, the magnetic linkage size is determined that by the electric current that flows through on it corresponding to certain inductance of determining, it has the restriction of individual lowest high-current value, in case exceed the current value of this restriction, inductance value can sharply descend, and makes system out of control.
Referring to Fig. 4, the steady operation process under the CCM pattern roughly comprises:
Current i L on one-period internal inductance L1 equates in the amount that the T1 stage rises and the T2 stage descends, namely, and (VI-VO)/L1*T1=VO/L1*T2.Wherein, the forward conduction voltage drop of having ignored sustained diode 1 and active controllable switch K1; T1+T2=T, TI are the ON time sections in the switch periods, and T2 is the shut-in time section in the switch periods, and T is switch periods; D=T1/T, D are the duty ratio of switch periods.Can be obtained by above-mentioned fortran: VO=VI*D, this formula control active controllable switch K1 action with the basic principle of stable output voltage, that is to say, according to the VI and the duty ratio D that determine, the output voltage VO that just can obtain determining.
The adjustment process that this circuit reply current i RL changes roughly comprises: if output current iRL increases suddenly, then output voltage VO can descend, and so, (VI-VO) value can rise in the T1 time, thereby, Δ iL(T1)=((VI-VO)/L1) * T1 can increase; Because VO descends in the T2 time, Δ iL(T2)=(VO/L1) * T2, the electric current slippage reduces, this just causes the current i L variation delta iL(T1 on the one-period T internal inductance L1)+Δ iL(T2) 0, and then cause the current i L on the next cycle T inductance L 1 to change since a new higher basis, so that the average current of inductance L 1 in rear one-period is greater than the average current in front cycle.As long as output voltage VO does not reach set point, this process can ceaselessly go on, descend until the average current of inductance L 1 is brought up to the output voltage VO that is enough to remedy the output current increase and causes, make output voltage VO come back to the VO value of setting, reach a new balance.Otherwise, if similar above-mentioned continuous concussion and the average current of lifting inductance L 1, also can appear suddenly with little in output current iRL, until reach a new balance.Referring to Fig. 5, in the situation of the VI*D of output voltage VO＜setting, the current i L on the inductance L 1 can continue to rise.
In addition, in the circuit start stage, initial voltage on the capacitor C 1 is 0, risen in the process of settings by 0V at VO, electric current in the inductance described in the adjustment process that changes with reference to above-mentioned circuit reply current i RL can be more and more higher before reaching balance, even will exceed on the inductance under the stable state several times of maximum average currents.This ratio is by capacitor C 1, the peak I LOADMAX of load current iRL, input voltage VI, the parameters such as duty ratio D determine, and the maximum average current under the so-called stable state is exactly the maximum load current that output requires, that is to say that in start-up course, the voltage-dropping type power circuit will bear the peak current than several times of height under the normal operating conditions.So, reliable and stable in order to ensure the voltage-dropping type power circuit just requires sustained diode 1, and active controllable switch K1 and inductance L 1 have the maximum operating currenbt ability of bearing in the circuit all working process.Equally, when circuit output short-circuit state, output voltage VO is 0 always, and this can cause the circuit output current to rise always, and output voltage VO can not get balance all the time, and is last even can cause the inefficacy of voltage-dropping type power circuit.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of control technology of active controllable switch of voltage-dropping type power circuit is proposed, can be with fly-wheel diode, the maximum operating currenbt capability control that the components and parts such as active controllable switch and inductance need to bear is in lower scope, thereby can reduce cost, promote the reliability of voltage-dropping type power circuit.
Utility model people of the present utility model finds through research, by in the overall process of voltage-dropping type power circuit work inductive current being monitored, and control forces inductance to drop to one and set low value and just allow again conducting releasing the electric current that make inductance in can the cycle, make in other words system works in DCM pattern (interrupted current mode of operation, this setting low value is zero), or work in shallow CCM pattern (this settings low value be greater than zero value).
Adopt the shallow CCM pattern of DCM/, can solve the voltage-dropping type power circuit in the desired very high maximum operating currenbt ability to bear of the processes such as opening process and output short-circuit.Be different from existing CCM pattern, the utility model makes inductance be operated in DCM pattern or shallow CCM, that is to say, before the rear one-period switch conduction, need to guarantee on the inductance that energy storage released complete or release to a certain degree, that is to say that the electric current on the inductance is reduced to 0 or set point.
The technical scheme that the utility model proposes for above-mentioned technical problem comprises, a kind of voltage-dropping type power circuit is proposed, comprise control circuit, active controllable switch, inductor-capacitor low pass filter and fly-wheel diode, the break-make that this control circuit can provide the first pwm signal to control this active controllable switch, this voltage-dropping type power circuit also comprises:
Detect resistance, it is connected with the inductance of this inductor-capacitor low pass filter, and is positioned at this active controllable switch one side of leaning on of this inductance, flows through the size of the electric current of this inductance in order to detection;
Auxiliary Control Element, it links to each other with this control circuit and detection resistance, and the signal that provides in order to the first pwm signal and this detection resistance that provides according to this control circuit produces the break-make that the second pwm signal is controlled this active controllable switch;
Wherein, when the signal that this Auxiliary Control Element only provides at this detection resistance drops to a setting low value, just allow this active controllable switch to be converted to conducting state by cut-off state.
This control circuit comprises exporting the trigger of this second pwm signal; This Auxiliary Control Element comprises comparator and logical combination, this comparator was compared and was provided a conditioning signal with setting reference voltage in order to should detect ohmically voltage drop, and this logical combination obtains this second pwm signal in order to this first pwm signal and this conditioning signal are carried out logical operation.
Set high value and/or this active controllable switch when the Current rise to of this inductance of flowing through and keep conducting state and reach a setting duration, this control circuit can force this active controllable switch to be converted to cut-off state by conducting state.
This control circuit, active controllable switch, comparator and Auxiliary Control Element are encapsulated in the integrated circuit, and this detection resistance is external in this integrated circuit.
This active controllable switch is triode.
The scope of the high value of this setting is 1.5 times-2.5 times of maximum output current.
The scope of this setting duration is 5us-20us.
The scope of this setting low value is 0 times-1 times of maximum output current.
Compared with prior art, voltage-dropping type power circuit of the present utility model, by making inductance be operated in the DCM pattern, can overcome the phenomenon that the electric current on the inductance can continue to rise, can be with fly-wheel diode, the maximum operating currenbt capability control that the components and parts such as active controllable switch and inductance need to bear is in lower scope, thereby can reduce cost, promotes the reliability of voltage-dropping type power circuit.
Description of drawings
Fig. 1 is the basic functional principle figure of existing voltage-dropping type power circuit.
Fig. 2 is the equivalent circuit diagram of existing voltage-dropping type power circuit when being in the switch conduction state.
Fig. 3 is the equivalent circuit diagram of existing voltage-dropping type power circuit when being in the switch cut-off state.
Fig. 4 is the working waveform figure of existing voltage-dropping type power circuit.
Fig. 5 is the schematic diagram that the electric current on the inductance of existing voltage-dropping type power circuit can continue to rise.
Fig. 6 is the basic functional principle figure of voltage-dropping type power circuit of the present utility model.
Fig. 7 is the basic functional principle figure of control module in the voltage-dropping type power circuit of the present utility model.
Fig. 8 is the effect explanation schematic diagram of voltage-dropping type power circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is given further elaboration.
The utility model proposes a kind of zero flux regulator method of voltage-dropping type power circuit, this voltage-dropping type power circuit comprises control circuit, active controllable switch, inductor-capacitor low pass filter and fly-wheel diode, the break-make that this control circuit can provide the first pwm signal to control this active controllable switch, this control method comprises:
Detection resistance is set, it is connected with the inductance of this inductor-capacitor low pass filter, and be positioned at this active controllable switch one side of leaning on of this inductance, flow through the size of the electric current of this inductance in order to detection;
Auxiliary Control Element is set, makes it with this control circuit and detect resistance to link to each other, the signal that provides in order to the first pwm signal and this detection resistance that provides according to this control circuit produces the break-make that the second pwm signal is controlled this active controllable switch;
Wherein, when the signal that this Auxiliary Control Element only provides at this detection resistance drops to a setting low value, just allow this active controllable switch to be converted to conducting state by cut-off state.
More specifically, set high value and/or this active controllable switch when the Current rise to of this inductance of flowing through and keep conducting state and reach a setting duration, this control circuit can force this active controllable switch to be converted to cut-off state by conducting state.
Preferably, the scope of the high value of this setting is 1.5 times-2.5 times of maximum output current (load current).More preferably, this sets high about 2 times of being worth for maximum output current.
Preferably, the scope of this setting duration is 5us-20us.More preferably, this is set about the 10us of duration for the setting duration.
Preferably, this setting low value is no more than 1 times of maximum output current (load current).More preferably, this setting low value is no more than 0.5 times of maximum output current.This sets low value can be zero.
Said method of the present utility model is applicable to switching power source chip, and high pressure step-down chip especially particularly uses the voltage-dropping type power circuit of inductance.
The utility model method all is to reset fully at inductive magnetic flux in each switch periods, namely is, moves during the electric current vanishing of the inductance of flowing through; During the active controllable switch conducting, when can rising to designated value according to inductive current, implements by voltage-dropping type power circuit of the present utility model the cut-off action; After the active controllable switch cut-off, voltage-dropping type power circuit of the present utility model can detect the action of implementing again conducting when inductive current drops to zero; No matter the utility model in the overall process of voltage-dropping type power circuit work, is startup, short circuit or normal operating conditions, all adopts above-mentioned detection and switch control mode.
Referring to voltage-dropping type power circuit embodiment of the present utility model shown in Figure 6, it is to improve on existing basic functional principle figure basis shown in Figure 1: detect resistance R isense one of the source that is connected to of inductance L 1 gate-controlled switch K1 side serial connection, flow through the electric current of inductance L 1 in order to detection, simultaneously the voltage drop signal leading at this detection resistance R isense two ends is participated in control to active controllable switch K1 to control unit KC1.
Referring to Fig. 7, the structure of block diagram of control unit KC1 is to improve on existing control unit KC0 basis: the control circuit 1 of existing control unit KC0 and with trigger 2 that this control circuit 1 links to each other between, the pulse-width control signal of control circuit 1 being exported to the setting end S of trigger 2 cuts off, make original pulse-width control signal and detect detection that resistance R isense provides judge the signal logic phase with after give again the setting end S of control with trigger 2.Judge signal for obtaining this detection, the utility model is by be provided with comparator 3 in this control unit KC1, judge that in order to realize to detect signal is used for active controllable switch K1 is controlled, the utility model has further been set up logical combination 4, comparator 3 and the aforesaid Auxiliary Control Element of logical combination 4 common formations.Wherein, two of comparator 3 relatively a reference voltage vref with setting in the inputs joins, the voltage drop signal at another and this detection resistance R isense two ends joins, thereby, no matter be at T1 or under the T2 operating state, inductance L 1 and detect resistance R isense series connection is as inductive current value iL〉during vref/Risense, comparator 3 output low levels, logical combination unit 4 is output low level also, control trigger 2 just not again conductings.Until inductive current value iL drops to below the vref/Risense, comparator 3 output high level, just allow again conducting, current i L on the inductance L 1 set point that requires to release in each switch periods T the inside just restarts like this, ipeak value in the system works also can be controlled so, can solve like this uncontrollable situation appearance of inductive current iL to occur in the situations such as startup and short circuit.
Need to prove, consider the factors such as noise signal that exist in the characteristic of comparator 3 itself and the circuit, although in theory, it is to carry out when inductive current is zero that the utility model requires the conducting of active controllable switch K1, reality then allows certain residual error, such as, as long as inductive current drops to less than 0.01 milliampere, namely be considered as inductive current and drop to zero.
Referring to Fig. 8, the relatively signal of the inductive current work wave in the startup situation for voltage-dropping type power circuit of the present utility model and existing voltage-dropping type power circuit, wherein dotted portion is current waveform of the present utility model, the ipeak value is limited.
Foregoing; it only is preferred embodiment of the present utility model; be not be used to limiting embodiment of the present utility model; those of ordinary skills are according to main design of the present utility model and spirit; protection range of the present utility model can carry out very easily corresponding flexible or modification, so should be as the criterion with the desired protection range of claims.
Claims (1)
1. voltage-dropping type power circuit, comprise control circuit, active controllable switch, inductor-capacitor low pass filter and fly-wheel diode, this control circuit can provide the first pwm signal to control the break-make of this active controllable switch, it is characterized in that, this voltage-dropping type power circuit also comprises:
Detect resistance, it is connected with the inductance of this inductor-capacitor low pass filter, and is positioned at this active controllable switch one side of leaning on of this inductance, flows through the size of the electric current of this inductance in order to detection;
Auxiliary Control Element, it links to each other with this control circuit and detection resistance, and the signal that provides in order to the first pwm signal and this detection resistance that provides according to this control circuit produces the break-make that the second pwm signal is controlled this active controllable switch;
Wherein, when the signal that this Auxiliary Control Element only provides at this detection resistance drops to a setting low value, just allow this active controllable switch to be converted to conducting state by cut-off state.
2
.According to voltage-dropping type power circuit claimed in claim 1, it is characterized in that this control circuit comprises exporting the trigger of this second pwm signal; This Auxiliary Control Element comprises comparator and logical combination, this comparator was compared and was provided a conditioning signal with setting reference voltage in order to should detect ohmically voltage drop, and this logical combination obtains this second pwm signal in order to this first pwm signal and this conditioning signal are carried out logical operation.
3
.According to voltage-dropping type power circuit claimed in claim 2, it is characterized in that, set high value and/or this active controllable switch when the Current rise to of this inductance of flowing through and keep conducting state and reach a setting duration, this control circuit can force this active controllable switch to be converted to cut-off state by conducting state.
4
.According to voltage-dropping type power circuit claimed in claim 2, it is characterized in that this control circuit, active controllable switch, comparator and Auxiliary Control Element are encapsulated in the integrated circuit, this detection resistance is external in this integrated circuit.
5
.According to voltage-dropping type power circuit claimed in claim 2, it is characterized in that this active controllable switch is triode.
6
.According to voltage-dropping type power circuit claimed in claim 3, it is characterized in that the scope of the high value of this setting is 1.5 times-2.5 times of maximum output current.
7
.According to voltage-dropping type power circuit claimed in claim 3, it is characterized in that the scope of this setting duration is 5us-20us.
8
.According to voltage-dropping type power circuit claimed in claim 1, it is characterized in that the scope of this setting low value is 0 times-1 times of maximum output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220301756 CN202713145U (en) | 2012-06-26 | 2012-06-26 | Voltage reducing type power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220301756 CN202713145U (en) | 2012-06-26 | 2012-06-26 | Voltage reducing type power circuit |
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| Publication Number | Publication Date |
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| CN202713145U true CN202713145U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220301756 Expired - Lifetime CN202713145U (en) | 2012-06-26 | 2012-06-26 | Voltage reducing type power circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516200A (en) * | 2012-06-26 | 2014-01-15 | 深圳市力生美半导体器件有限公司 | Voltage reduction type power circuit and method for controlling zero-magnetic-flux high-voltage switch |
| CN104053288A (en) * | 2014-07-08 | 2014-09-17 | 浙江大学常州工业技术研究院 | Non-isolation step-down LED drive circuit capable of adaptive power supply and working method |
| CN104053289A (en) * | 2014-07-09 | 2014-09-17 | 浙江大学常州工业技术研究院 | Non-isolation step-down LED drive circuit capable of directly obtaining sampling current and working method |
| CN104242634A (en) * | 2013-06-09 | 2014-12-24 | 深圳市力生美半导体器件有限公司 | DC/DC converter and switching power supply |
-
2012
- 2012-06-26 CN CN 201220301756 patent/CN202713145U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516200A (en) * | 2012-06-26 | 2014-01-15 | 深圳市力生美半导体器件有限公司 | Voltage reduction type power circuit and method for controlling zero-magnetic-flux high-voltage switch |
| CN104242634A (en) * | 2013-06-09 | 2014-12-24 | 深圳市力生美半导体器件有限公司 | DC/DC converter and switching power supply |
| CN104053288A (en) * | 2014-07-08 | 2014-09-17 | 浙江大学常州工业技术研究院 | Non-isolation step-down LED drive circuit capable of adaptive power supply and working method |
| CN104053288B (en) * | 2014-07-08 | 2016-04-13 | 浙江大学常州工业技术研究院 | The non-isolated voltage-dropping type LED drive circuit of adaptation power supply |
| CN104053289A (en) * | 2014-07-09 | 2014-09-17 | 浙江大学常州工业技术研究院 | Non-isolation step-down LED drive circuit capable of directly obtaining sampling current and working method |
| CN104053289B (en) * | 2014-07-09 | 2016-02-10 | 浙江大学常州工业技术研究院 | The non-isolated voltage-dropping type LED drive circuit of direct acquisition sample rate current and method of work |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Address after: 518000, Shenzhen, Guangdong Province, Nanshan District science and technology road, 1, SED science and technology building on the south side of the 10 floor, block A Patentee after: LII SEMICONDUCTOR Inc. Address before: Longgang District of Shenzhen City, Guangdong province 518000 Longgang Street Baolong community Jinlong Avenue 2 refined ingot technology industrial plant building No. 1 201~202 Patentee before: SHENZHEN LII SEMICONDUCTOR DEVICES Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |