CN101795515A - Started overshoot current suppression circuit - Google Patents
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Abstract
The invention discloses an overshoot current suppression circuit, which comprises an overshoot current bypass circuit, a constant current or constant voltage control circuit and a load current-limiting circuit. The overshoot current bypass circuit is controlled by using step current as later constant current or constant voltage at the moment of startup so that the reference voltage of the circuit is transiently changed and the function of suppressing output overshoot current is realized. Compared with the prior art, the overshoot current suppression circuit has the advantages that: 1, a few devices are used, so the structure is simple and the cost is low; 2, the effect of suppressing the overshoot current is good, and the micro lightening and flickering phenomenon at the moment of startup can be effectively eliminated; 3, the overshoot current suppression circuit has wide the applicable topology, and is suitable for non-isolated topology of a BOOST circuit and the like and isolated topology of a fly-back circuit and the like; and 4, the overshoot current suppression circuit can be applied in various constant-current or constant-voltage output converter topology circuits.
Description
Technical field
The present invention relates to overshoot current suppression circuit, relate in particular to the startup overshoot current suppression circuit that is applicable to constant current or constant voltage outputting circuit.
Background technology
LED be called as the 4th generation lighting source or green light source, have advantages such as energy-saving and environmental protection, the life-span is long, response is fast, be widely used in fields such as various indications, demonstration, decoration, backlight, general lighting and urban landscape illumination.Along with the decline of led light source price, the LED light fixture is come into huge numbers of families gradually, wherein comparatively extensive use for replacing the LED strip light of fluorescent lamp.And LED strip light product in the market, ubiquity and is being opened earlier little bright just normal then luminous phenomenon of a flicker that then has of moment once.This is owing to start the overshoot of immediate current and cause, and therefore introducing succinct practical overshoot current suppression circuit, to solve this problem be to have very much realistic meaning.
In the prior art, be illustrated in figure 1 as that Chinese patent (CN 101011172A) proposes a kind of LED driving circuit, this drive circuit comprises constant biasing module and constant-current driven module, constant biasing module produces at least two voltage sources that magnitude of voltage is different, a voltage source provides the normal bias voltage of constant-current driven module, the magnitude of voltage that another voltage source provides is lower than normal bias voltage, also has a control module in the circuit, this control module is used to control the variation of passage current between constant-current driven module and the light-emitting diode, the light-emitting diodes path connects the low pressure bias source when disconnecting, just switch to the normal pressure bias source during operate as normal, starting moment like this, the electric current that constant-current driven module 3 produces will be limited, to realize suppressing the function of overshoot.Though this circuit has the ability of certain inhibition overshoot, its control mode complexity, reliability are difficult to guarantee, and the circuit structure complexity, and cost is higher.
Summary of the invention
Technical problem to be solved by this invention is to overcome deficiency of the prior art, and a kind of effective startup overshoot current suppression circuit is provided.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions: start overshoot current suppression circuit, comprise overshoot current bypass circuit, constant current or constant-voltage control circuit and load current-limiting circuit, it is characterized in that:
Described overshoot current bypass circuit comprises capacitance C1, transistor Q1, discharge diode D1 and/or discharge resistance R6; Described capacitance C1 only crosses step current at the start transient flow, discharge by discharge diode D1 and/or discharge resistance R6 during shutdown, thereby realization suppresses the function of output overshoot current;
Described constant current or constant-voltage control circuit comprise sampling resistor Rs, integrating capacitor C2 and suppress resistance R 2 that described sampling resistor Rs is connected in the load current ring; , because suppressing to produce a step voltage VR2 on the resistance R 2, step current and reduces rapidly in start moment; When step voltage VR2 is reduced to reference voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed;
Described load current-limiting circuit comprises transistor Q2, capacitor C 4, resistance R 4 and voltage-stabiliser tube Z2; Because the effect of capacitor C 4 and resistance R 4 makes the voltage that is added on the Q2 slowly rise, and makes its conducting through the cut-in voltage that just reaches Q2 after one period blink, thereby makes load LED normally luminous.
Described constant current or constant-voltage control circuit can be realized by integrated regulator Z1, in start moment because step current is suppressing to produce on the resistance R 2 a step voltage VR2, make the R pin voltage of integrated regulator integrated regulator Z1 in blink, be higher than the reference voltage of integrated regulator Z1 inside, and reduce rapidly; When VR2 is reduced to reference voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
Described constant current or constant-voltage control circuit can be realized by operational amplifier U1 and direct current biasing source S1, in start moment because step current is suppressing to produce on the resistance R 2 a step voltage VR2, make the backward end voltage of operational amplifier U1 in blink, be higher than the dc offset voltage of end in the same way, and reduce rapidly; When backward end voltage is reduced to bias voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
The another kind of technical scheme that the present invention solves the starting current overshooting problem is: start overshoot current suppression circuit, comprise overshoot current bypass circuit, constant current or constant-voltage control circuit and load current-limiting circuit, it is characterized in that:
Described overshoot current bypass circuit comprises capacitance C1, transistor Q1, discharge diode D1 and/or discharge resistance R6; Described capacitance C1 only crosses step current at the start transient flow, discharge by discharge diode D1 and/or discharge resistance R6 during shutdown, thereby realization suppresses the function of output overshoot current;
Described constant current or constant-voltage control circuit comprise sampling resistor Rs, integrating capacitor C2 and suppress resistance R 2 that described sampling resistor Rs is connected in the load current ring; The step current of being introduced by the Vcc pin of chip in the moment of starting shooting makes transistor Q1 open-minded, with the of short duration closely current potential that is pulled low to of voltage that suppresses on the resistance R 2, and then increase to reference voltage rapidly, make current loop begin operate as normal, and the overshoot current bypass circuit turn-off owing to the effect of capacitance C1;
Described load current-limiting circuit comprises transistor Q2, capacitor C 4, resistance R 4 and voltage-stabiliser tube Z2; Because the effect of capacitor C 4 and resistance R 4 makes the voltage that is added on the Q2 slowly rise, and makes its conducting through the cut-in voltage that just reaches Q2 after one period blink, thereby makes load LED normally luminous.
Described constant current or constant-voltage control circuit can be realized by integrated regulator Z1, the step current of being introduced by the Vcc pin of chip in the moment of starting shooting makes transistor Q1 open-minded, with the of short duration closely current potential that is pulled low to of the voltage on the R pin of integrated regulator Z1, and then increase to reference voltage rapidly, make current loop begin operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
Described constant current or constant-voltage control circuit can be realized by operational amplifier U1 and direct current biasing source S1.
Overshoot current bypass circuit of the present invention only utilizes step current to act on the constant current or the constant-voltage control circuit of back in the moment of starting shooting, and makes the of short duration change of its reference voltage, thereby realizes suppressing the function of output overshoot current.Described transistor Q1 can be that triode also can be MOSFET.
Compared with prior art, the invention has the beneficial effects as follows:
1, used components and parts are few, and are simple in structure, with low cost;
2, the inhibition overshoot current is effective, can effectively eliminate the little bright and scintillation of opening moment;
3, be suitable for topology extensively, be not only applicable to non-isolation type topologys such as BOOST circuit, also be applicable to isolated form topologys such as circuit of reversed excitation.
4, can be applicable in the converter topology circuit of all kinds of constant currents or constant voltage output.
According to first kind of technical scheme of the present invention, the execution mode of a typical overshoot current bypass circuit is: the collector electrode of the termination transistor Q1 of described capacitance C1 (or drain electrode), the base stage (or grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter (or source electrode) that meets transistor Q1 directly or connect the R pin of integrated regulator Z1 behind the pull-up resistor R1 that connects, the collector electrode of transistor Q1 (or drain electrode) is directly or connect the Vcc pin of chip behind the pull-up resistor R0 that connects.
According to first kind of technical scheme of the present invention, the execution mode of another typical overshoot current bypass circuit is: the collector electrode (drain electrode) of the termination transistor Q1 of described capacitance C1, the base stage (or grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of R1, the emitter of transistor Q1 (or source electrode) directly or connect the R pin of integrated regulator Z1 behind the pull-up resistor R1 that connects connects the Vcc pin of chip behind the direct or pull-up resistor R0 that connects of the collector electrode of transistor Q1 (drain electrode).
According to first kind of technical scheme of the present invention, the execution mode of the third typical overshoot current bypass circuit is: the collector electrode of the termination transistor Q1 of described capacitance C1 (or drain electrode), the base stage (grid) of another termination transistor Q1, the end of the negative electrode of discharge diode D1 and discharge resistance R6, the other end ground connection of the anode of discharge diode D1 and discharge resistance R6, the emitter of transistor Q1 (source electrode) directly or connect the R pin of integrated regulator Z1 behind the pull-up resistor R1 that connects, the collector electrode of transistor Q1 (or drain electrode) is directly or connect the Vcc pin of chip behind the pull-up resistor R0 that connects.
According to first kind of technical scheme of the present invention, the execution mode of a kind of typical constant current or constant-voltage control circuit is: the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
According to first kind of technical scheme of the present invention, the execution mode of another kind of typical constant current or constant-voltage control circuit is: the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, an end that suppresses another termination sampling resistor Rs of resistance R 2, the source electrode (emitter) of the emitter of transistor Q1 (source electrode) and transistor Q2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
According to second kind of technical scheme of the present invention, the execution mode of a typical overshoot current bypass circuit is: the Vcc pin of the termination control chip of described capacitance C1, the base stage (or grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter of transistor Q1 (or source electrode) ground connection, the collector electrode of transistor Q1 (or drain electrode) connects the R pin of integrated regulator Z1.
According to second kind of technical scheme of the present invention, the execution mode of another typical overshoot current bypass circuit is: the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of discharge resistance R6, the emitter of transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
According to second kind of technical scheme of the present invention, the execution mode of the third typical overshoot current bypass circuit is: the end of the termination pull-up resistor R0 of described capacitance C1, the base stage (or grid) of another termination transistor Q1, the negative electrode of discharge diode D1 and the end of discharge resistance R6, the Vcc pin of another chip termination of pull-up resistor R0, the emitter of the other end of the anode of discharge diode D1, discharge resistance R6 and transistor Q1 (or source electrode) ground connection, the collector electrode of transistor Q1 (or drain electrode) connects the R pin of integrated regulator Z1.
According to second kind of technical scheme of the present invention, the execution mode of a kind of typical constant current or constant-voltage control circuit is: the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (or emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
According to second kind of technical scheme of the present invention, the execution mode of another kind of typical constant current or constant-voltage control circuit is: the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, an end that suppresses another termination sampling resistor Rs of resistance R 2, the source electrode (emitter) of the collector electrode of transistor Q1 (drain electrode) and transistor Q2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
According to the present invention, the execution mode of described load current-limiting circuit is: the drain electrode of transistor Q2 (or collector electrode) links to each other with the negative terminal of load LED, the source electrode of transistor Q2 (or emitter) links to each other with the end of sampling resistor Rs, an end of capacitor C 4 and the positive pole of voltage-stabiliser tube Z2, the grid of transistor Q2 (or base stage) links to each other with the other end and the negative pole of a voltage-stabiliser tube Z2 and end of resistance R 4 of capacitor C 4, and the other end of resistance R 4 links to each other with the Vcc pin of control chip.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the circuit diagram that suppresses to start overshoot current in the prior art.
Fig. 2 is first kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Fig. 3 is second kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
The third suppresses to start the execution mode of overshoot current circuit to Fig. 4 for the present invention.
Fig. 5 is the 4th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Fig. 6 is the 5th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Fig. 7 is the 6th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Fig. 8 is the 7th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Fig. 9 is the 8th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Figure 10 is the 9th kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Figure 11 is the tenth kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Figure 12 is the 11 kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Figure 13 is the 12 kind of execution mode that suppresses to start the overshoot current circuit of the present invention.
Embodiment
With reference to accompanying drawing 2, be a kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination TL431, the collector electrode of transistor Q1 (drain electrode) connects the Vcc pin of chip.
In the present embodiment, the K pin of described integrated regulator TL431 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination TL431 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination TL431 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
In the present embodiment, the drain electrode of described transistor Q2 (collector electrode) links to each other with the negative terminal of load LED, the source electrode of transistor Q2 (emitter) links to each other with the end of sampling resistor Rs, an end of capacitor C 4 and the positive pole of voltage-stabiliser tube Z2, the grid of transistor Q2 (base stage) links to each other with the other end and the negative pole of a voltage-stabiliser tube Z2 and end of resistance R 4 of capacitor C 4, and the other end of resistance R 4 links to each other with the Vcc pin of control chip.
With reference to accompanying drawing 3, be second kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of R1, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination TL431, the collector electrode of transistor Q1 (drain electrode) connects the Vcc pin of chip.
In the present embodiment, the K pin of described integrated regulator TL431 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination TL431 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination TL431 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 4, for of the present invention the third starts overshoot current suppression circuit.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1, the negative electrode of discharge diode D1 and the end of discharge resistance R6, the other end ground connection of the anode of discharge diode D1 and discharge resistance R6, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination TL431, the collector electrode of transistor Q1 (drain electrode) connects an end that draws resistance R 0, the Vcc pin of another chip termination of pull-up resistor R0.
In the present embodiment, output termination control chip and the switching tube of described operational amplifier U1, the end of integrating capacitor C2 and an end of resistance R 5, one end of another termination capacitor C 3 of one end of resistance R 5, the output of another termination operational amplifier U1 of capacitor C 3, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, an end that suppresses another termination sampling resistor Rs of resistance R 2, the source electrode (emitter) of the emitter of transistor Q1 (source electrode) and transistor Q2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 5, be the 4th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination integrated regulator Z1, the collector electrode of transistor Q1 (drain electrode) connects the Vcc pin of chip.
In the present embodiment, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, the end, the emitter (source electrode) of transistor Q1 and the source electrode (emitter) of transistor Q2 that suppress another termination sampling resistor Rs of resistance R 2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 6, be the 5th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of R1, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination integrated regulator Z1, the collector electrode of transistor Q1 (drain electrode) connects the Vcc pin of chip.
In the present embodiment, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, the end, the emitter (source electrode) of transistor Q1 and the source electrode (emitter) of transistor Q2 that suppress another termination sampling resistor Rs of resistance R 2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 7, be the 6th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1, the negative electrode of discharge diode D1 and the end of discharge resistance R6, the other end ground connection of the anode of discharge diode D1 and discharge resistance R6, the emitter (source electrode) of the termination transistor Q1 of pull-up resistor R1, the R pin of another termination TL431, the collector electrode of transistor Q1 (drain electrode) connects an end that draws resistance R 0, the Vcc pin of another chip termination of pull-up resistor R0.
In the present embodiment, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, the end, the emitter (source electrode) of transistor Q1 and the source electrode (emitter) of transistor Q2 that suppress another termination sampling resistor Rs of resistance R 2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 8, be the 7th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter of transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 9, be the 8th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of discharge resistance R6, the emitter of transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 10, be the 9th kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the end of the termination pull-up resistor R0 of described capacitance C1, the base stage (grid) of another termination transistor Q1, the negative electrode of discharge diode D1 and the end of discharge resistance R6, the Vcc pin of another chip termination of pull-up resistor R0, the emitter of the other end of the anode of discharge diode D1, discharge resistance R6 and transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 11, be the of the present invention ten kind of startup overshoot current suppression circuit.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the negative electrode of discharge diode D1, the plus earth of discharge diode D1, the emitter of transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 12, be the 11 kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the Vcc pin of the termination control chip of described capacitance C1, the base stage (grid) of another termination transistor Q1 and the end of discharge resistance R6, the other end ground connection of discharge resistance R6, the emitter of transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and the source electrode (emitter) of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
Other structures of present embodiment and aforesaid first embodiment are similar.
With reference to accompanying drawing 13, be the 12 kind of startup overshoot current suppression circuit of the present invention.
In the present embodiment, the end of the termination pull-up resistor R0 of described capacitance C1, the base stage (grid) of another termination transistor Q1, the negative electrode of discharge diode D1 and the end of discharge resistance R6, the Vcc pin of another chip termination of pull-up resistor R0, the emitter of the other end of the anode of discharge diode D1, discharge resistance R6 and transistor Q1 (source electrode) ground connection, the collector electrode of transistor Q1 (drain electrode) connects the R pin of integrated regulator Z1.
In the present embodiment, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, the end, the collector electrode (drain electrode) of transistor Q1 and the source electrode (emitter) of transistor Q2 that suppress another termination sampling resistor Rs of resistance R 2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
Other structures of present embodiment and aforesaid first embodiment are similar.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (12)
1. the startup overshoot current suppression circuit comprises overshoot current bypass circuit, constant current or constant-voltage control circuit and load current-limiting circuit, it is characterized in that:
Described overshoot current bypass circuit comprises capacitance C1, transistor Q1, discharge diode D1 and/or discharge resistance R6; Described capacitance C1 only crosses step current at the start transient flow, discharge by discharge diode D1 and/or discharge resistance R6 during shutdown, thereby realization suppresses the function of output overshoot current;
Described constant current or constant-voltage control circuit comprise sampling resistor Rs, integrating capacitor C2 and suppress resistance R 2 that described sampling resistor Rs is connected in the load current ring; , because suppressing to produce a step voltage VR2 on the resistance R 2, step current and reduces rapidly in start moment; When step voltage VR2 is reduced to reference voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed;
Described load current-limiting circuit comprises transistor Q2, capacitor C 4, resistance R 4 and voltage-stabiliser tube Z2; Because the effect of capacitor C 4 and resistance R 4 makes the voltage that is added on the Q2 slowly rise, and makes its conducting through the cut-in voltage that just reaches Q2 after one period blink, thereby makes load LED normally luminous.
2. startup overshoot current suppression circuit as claimed in claim 1, it is characterized in that described constant current or constant-voltage control circuit also comprise integrated regulator Z1, in start moment because step current is suppressing to produce on the resistance R 2 a step voltage VR2, make the R pin voltage of integrated regulator integrated regulator Z1 in blink, be higher than the reference voltage of integrated regulator Z1 inside, and reduce rapidly; When VR2 is reduced to reference voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
3. startup overshoot current suppression circuit as claimed in claim 2, it is characterized in that in described overshoot current bypass circuit, collector electrode or the drain electrode of the termination transistor Q1 of described capacitance C1, the negative electrode of the base stage of another termination transistor Q1 or grid, discharge diode D1 and/or the end of discharge resistance R6, the other end ground connection of the anode of discharge diode D1 and/or discharge resistance R6, the emitter of transistor Q1 or source electrode are directly or connect the R pin of integrated regulator Z1 behind the pull-up resistor R1 that connects; Connect the Vcc pin of chip behind the collector electrode of transistor Q1 or drain direct or the pull-up resistor R0 that connects.
4. startup overshoot current suppression circuit as claimed in claim 2, it is characterized in that in described constant current or constant-voltage control circuit, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and source electrode or the emitter of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
5. startup overshoot current suppression circuit as claimed in claim 1, it is characterized in that described constant current or constant-voltage control circuit also comprise operational amplifier U1 and direct current biasing source S1, in start moment because step current is suppressing to produce on the resistance R 2 a step voltage VR2, make the backward end voltage of operational amplifier U1 in blink, be higher than the dc offset voltage of end in the same way, and reduce rapidly; When backward end voltage is reduced to bias voltage when following, electric current loop begins operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
6. startup overshoot current suppression circuit as claimed in claim 5, it is characterized in that in described constant current or constant-voltage control circuit, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, an end that suppresses another termination sampling resistor Rs of resistance R 2, the source electrode of the emitter of transistor Q1 or source electrode and transistor Q2 or emitter, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
7. the startup overshoot current suppression circuit comprises overshoot current bypass circuit, constant current or constant-voltage control circuit and load current-limiting circuit, it is characterized in that:
Described overshoot current bypass circuit comprises capacitance C1, transistor Q1, discharge diode D1 and/or discharge resistance R6; Described capacitance C1 only crosses step current at the start transient flow, discharge by discharge diode D1 and/or discharge resistance R6 during shutdown, thereby realization suppresses the function of output overshoot current;
Described constant current or constant-voltage control circuit comprise sampling resistor Rs, integrating capacitor C2 and suppress resistance R 2 that described sampling resistor Rs is connected in the load current ring; The step current of being introduced by the Vcc pin of chip in the moment of starting shooting makes transistor Q1 open-minded, with the of short duration closely current potential that is pulled low to of voltage that suppresses on the resistance R 2, and then increase to reference voltage rapidly, make current loop begin operate as normal, and the overshoot current bypass circuit turn-off owing to the effect of capacitance C1;
Described load current-limiting circuit comprises transistor Q2, capacitor C 4, resistance R 4 and voltage-stabiliser tube Z2; Because the effect of capacitor C 4 and resistance R 4 makes the voltage that is added on the Q2 slowly rise, and makes its conducting through the cut-in voltage that just reaches Q2 after one period blink, thereby makes load LED normally luminous.
8. startup overshoot current suppression circuit as claimed in claim 7, it is characterized in that described constant current or constant-voltage control circuit also comprise integrated regulator Z1, the step current of being introduced by the Vcc pin of chip in the moment of starting shooting makes transistor Q1 open-minded, with the of short duration closely current potential that is pulled low to of the voltage on the R pin of integrated regulator Z1, and then increase to reference voltage rapidly, make current loop begin operate as normal, and the overshoot current bypass circuit is owing to the effect of capacitance C1 is turn-offed.
9. startup overshoot current suppression circuit as claimed in claim 8, it is characterized in that in described overshoot current bypass circuit, the end of described capacitance C1 directly or connect the Vcc pin of control chip behind the pull-up resistor R0 that connects, the negative electrode of the base stage of another termination transistor Q1 or grid, discharge diode D1 and/or the end of discharge resistance R6, the other end ground connection of the anode of discharge diode D1 and/or discharge resistance R6, the emitter of transistor Q1 or source ground, the collector electrode of transistor Q1 or drain electrode connect the R pin of integrated regulator Z1.
10. startup overshoot current suppression circuit as claimed in claim 8, it is characterized in that in described constant current or constant-voltage control circuit, the K pin of described integrated regulator Z1 connects the end of control chip and switching tube and integrating capacitor C2, one end of the R pin of another termination integrated regulator Z1 of integrating capacitor C2 and inhibition resistance R 2, the end and source electrode or the emitter of transistor Q2, the A pin of another termination integrated regulator Z1 of sampling resistor Rs and the ground that suppress another termination sampling resistor Rs of resistance R 2.
11. startup overshoot current suppression circuit as claimed in claim 7, it is characterized in that described constant current or constant-voltage control circuit also comprise operational amplifier U1 and direct current biasing source S1, the end of the output termination control chip of described operational amplifier U1 and switching tube and integrating capacitor C2, one end of the backward end of another termination operational amplifier U1 of integrating capacitor C2 and inhibition resistance R 2, an end that suppresses another termination sampling resistor Rs of resistance R 2, the collector electrode drain electrode of transistor Q1 and the source emitter utmost point of transistor Q2, the other end ground connection of sampling resistor Rs, the positive pole of direct current biasing source S1 connects the end in the same way of operational amplifier U1, minus earth.
12. as any one described startup overshoot current suppression circuit of claim 1-11, it is characterized in that in the described load current-limiting circuit, the drain electrode of transistor Q2 or collector electrode link to each other with the negative terminal of load LED, the source electrode of transistor Q2 or emitter link to each other with the end of sampling resistor Rs, an end of capacitor C 4 and the positive pole of voltage-stabiliser tube Z2, the grid of transistor Q2 or base stage link to each other with the other end and the negative pole of a voltage-stabiliser tube Z2 and end of resistance R 4 of capacitor C 4, and the other end of resistance R 4 links to each other with the Vcc pin of control chip.
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| CN2010100031162A CN101795515B (en) | 2010-01-05 | 2010-01-05 | Started overshoot current suppression circuit |
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| CN2010100031162A CN101795515B (en) | 2010-01-05 | 2010-01-05 | Started overshoot current suppression circuit |
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| CN103051165A (en) * | 2011-10-13 | 2013-04-17 | 上海华虹Nec电子有限公司 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
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| WO2013033916A1 (en) * | 2011-09-06 | 2013-03-14 | 深圳市华星光电技术有限公司 | Led drive circuit, drive method, and liquid crystal display device |
| CN103051165A (en) * | 2011-10-13 | 2013-04-17 | 上海华虹Nec电子有限公司 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
| CN103051165B (en) * | 2011-10-13 | 2015-06-03 | 上海华虹宏力半导体制造有限公司 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
| CN103633977A (en) * | 2013-11-05 | 2014-03-12 | 奇瑞汽车股份有限公司 | Double-input switching circuit and power-off protecting method applying same circuit |
| CN106413192A (en) * | 2016-10-25 | 2017-02-15 | 上海路傲电子科技有限公司 | Linear constant current drive circuit |
| CN106413192B (en) * | 2016-10-25 | 2020-12-15 | 上海路傲电子科技有限公司 | Linear constant current driving circuit |
| CN106452037A (en) * | 2016-11-23 | 2017-02-22 | 生迪智慧科技有限公司 | Power control circuit and current protection circuit |
| CN110168885A (en) * | 2016-12-27 | 2019-08-23 | 株式会社京三制作所 | The control method of power supply device and power supply device |
| CN108012379A (en) * | 2017-12-26 | 2018-05-08 | 长沙龙生光启新材料科技有限公司 | A kind of transient current limiting circuit |
| CN112214058A (en) * | 2020-11-27 | 2021-01-12 | 武汉精能电子技术有限公司 | Circuit for inhibiting starting current overshoot |
| CN113676033A (en) * | 2021-08-18 | 2021-11-19 | 中车青岛四方车辆研究所有限公司 | Current transformer |
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