CN103901938A - Quick starting circuit and constant current drive circuit of integrated circuit - Google Patents
Quick starting circuit and constant current drive circuit of integrated circuit Download PDFInfo
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- CN103901938A CN103901938A CN201210578004.9A CN201210578004A CN103901938A CN 103901938 A CN103901938 A CN 103901938A CN 201210578004 A CN201210578004 A CN 201210578004A CN 103901938 A CN103901938 A CN 103901938A
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Abstract
The invention discloses a quick starting circuit of an integrated circuit. The quick starting circuit comprises a small-resistance-value impedance element providing quick starting currents. The quick starting circuit further comprises a switch element connected with the small-resistance-value impedance element and a voltage stabilizing circuit connected with the switch element. The voltage stabilizing circuit comprises a large-resistance-value impedance element and a voltage stabilizing device. One end of the large-resistance-value impedance element of the voltage stabilizing circuit is connected between the first end of the switch element and the small-resistance-value impedance element. The second end of the switch element is connected between the large-resistance-value impedance element and the voltage stabilizing device. The third end of the switch element outputs starting currents of the integrated circuit.
Description
[technical field]
The present invention relates to a kind of circuit, especially refers to a kind of fast start circuit for integrated circuit.
[background technology]
In some electronic systems, much all can use the control that integrated circuit is correlated with.The working power of these integrated circuit generally can not be self-supporting, therefore must have a power circuit that integrated circuit (IC) work is provided in the periphery of integrated circuit.General circuit adopts the power supply mode of accompanying drawing (Fig. 1), and its principle is: when electronic system powers on, alternating current provides startup power supply after diode D11 commutation capacitor C11 filtering, via resistance R 11 is rear, capacitor C 12 is charged.The work that arrives integrated circuit (IC) when the voltage of capacitor C 12 starts power supply, and integrated circuit (IC) is started working, and electronic system is started working.Now transformer T11 auxiliary winding provides stable electric current to maintain integrated circuit (IC) work through diode D12.Because the volume ratio of capacitor C 12 is larger, just can maintain and start rear integrated circuit (IC) steady operation.If require electronic system to start fast, just require the RC duration of charging less.That will reduce the resistance of resistance R 11, but can increase the loss of resistance R 11, reduce the efficiency of electronic system.The working power of integrated circuit (IC) also can be provided by mini-switch power source system, will inevitably increase like this volume of electronic system, the cost of increase is also very large.
Therefore,, in order to overcome above-mentioned defect, be necessary to provide a kind of fast start circuit of improved integrated circuit.
[summary of the invention]
The object of the present invention is to provide a kind of fast start circuit of low-loss integrated circuit.
To achieve these goals, the present invention adopts following technical scheme: a kind of fast start circuit of integrated circuit, comprise the impedor of the little resistance that quick starting current is provided, fast start circuit also comprises the mu balanced circuit that connects the impedor on-off element of described little resistance and connect described on-off element, described mu balanced circuit comprises impedor and a stable-pressure device of a large resistance, impedor one end of large resistance of described mu balanced circuit connects between the first end and described little resistance impedor of described on-off element, between described large resistance impedor and stable-pressure device, connect the second end of described on-off element, the starting current of the 3rd end output integrated circuit of described on-off element.
Compared to prior art, the fast start circuit of integrated circuit of the present invention has the following advantages: the large electric current of fast start circuit is both provided, can caused again the high power loss of the rear start-up circuit of the normal work of integrated circuit.
[brief description of the drawings]
Fig. 1 is driver circuits for integrated circuit of the prior art.
Fig. 2 is the schematic diagram of the first preferred embodiment of integrated circuit fast start circuit of the present invention.
Fig. 3 is the schematic diagram of the second preferred embodiment of integrated circuit fast start circuit of the present invention.
Fig. 4 is the schematic diagram of constant-current drive circuit of the present invention.
[embodiment]
Shown in Fig. 2, it is the diagram of the first preferred embodiment of the fast start circuit 200 of integrated circuit of the present invention.Alternating current is by the startup power supply as start-up circuit 200 after fairing D22 and filter capacitor C21.The fast start circuit 200 of integrated circuit (IC) 2 comprises the impedor R21 of the little resistance that connects startup power supply, the on-off element Q21 that connects impedor R21 and the mu balanced circuit 201 of connecting valve element Q21.Mu balanced circuit 201 comprises impedor R22 and a stable-pressure device D21 of a larger resistance.Between the first end and little resistance impedor R21 of one end connecting valve element Q21 of the larger resistance impedor R22 of mu balanced circuit 201.The second end of connecting valve element Q21 between large resistance impedor R22 and stable-pressure device D21, the starting current of the 3rd end output integrated circuit (IC) 2 of on-off element Q21.
On-off element Q21 is triode, and the collector of triode Q21 connects little resistance impedor R21 and large resistance impedor R22.The base stage of triode Q21 connects between the large resistance impedor R22 and stable-pressure device D21 of mu balanced circuit 201.The emitter output starting current of triode Q21.
The external current rectifying and wave filtering circuit 210 of fast start circuit 200 of integrated circuit (IC) 2.One end of little resistance impedor R21 connects one end of current rectifying and wave filtering circuit 210.The other end of little resistance impedor R21 connects after mu balanced circuit 201, by the stable-pressure device D21 ground connection of mu balanced circuit 201.
In the present embodiment, little resistance impedor R21 is resistance, and its resistance is very little, and large resistance impedor R22 is also resistance, and its resistance is very large, generally makes R22/R21=-1.When after electronic system energising, alternating current is after current rectifying and wave filtering circuit 210, provide base current by little resistance impedor R21, large resistance impedor R22 to triode Q21, make the Vc > Vb > Ve of triode Q21.Now triode Q21 conducting, is equivalent to short circuit, and because little resistance impedor R21 resistance is very little, larger electric current flows through little resistance impedor R21 capacitor C 24 is charged.Voltage VCC can reach the trigger voltage of integrated circuit (IC) 2 fast, and integrated circuit (IC) 2 is started working, and now the auxiliary winding of transformer T21 provides stable electric current to maintain integrated circuit (IC) 2 through diode D23 to work.Triode Q21 base stage is to connecting stable-pressure device D21 between ground, therefore the base voltage of triode Q21 can a value toward rising, the voltage stabilizing value of stable-pressure device D21 is more slightly bigger than integrated circuit (IC) 2 trigger voltages.The voltage of Design of Transformer T21 auxiliary winding output is greater than the voltage stabilizing value of voltage stabilizing element D21, allows maximum working voltage but be less than integrated circuit (IC) 2.After integrated circuit (IC) 2 starts, transformer T21 auxiliary winding provides stable electric current to make VCC > Vb through diode D23, the Vc > Ve > Vb of triode Q21, triode Q21 cut-off, be equivalent to open circuit, now little resistance impedor R21 connects with large resistance impedor R22, and the power consumption of the very little therefore R21 of electric current that flows through R21 is also very little.After system stability work, if VCC because certain abnormal cause is lower than the voltage stabilizing value of stable-pressure device D21, triode Q21 enters conducting state again.In the present embodiment, stable-pressure device D21 is voltage stabilizing diode.
The present embodiment provides a kind of method of quick startup integrated circuit, comprising:
The first step, provides a connection to start the impedor R21 of the little resistance of power supply 210, and little resistance impedor R21 can provide enough large electric current to start fast integrated circuit (IC) 2.
Second step, provides an on-off element Q21, and on-off element Q21 connects described little resistance impedor R21, and on-off element Q21 connects integrated circuit (IC) 2 by filter capacitor C24.
The 3rd step, provides a mu balanced circuit 201, and mu balanced circuit 201 connecting valve element Q21 comprise impedor R22 and a stable-pressure device D21 of a large resistance, the voltage at two ends when the voltage stabilizing value that stable-pressure device D21 is set is less than integrated circuit (IC) 2 normal work.
The 4th step, connects and starts power supply, and on-off element Q21 is in conducting state, and power supply provides starting current through on-off element Q21 for integrated circuit (IC) 2 by little resistance impedor R21.
The 5th step, integrated circuit (IC) 2 start working after voltage rise, in the time of the voltage stabilizing value that is to a certain degree greater than stable-pressure device D21 that the voltage at integrated circuit (IC) 2 two ends rises, on-off element Q21 closes.
Shown in Fig. 3, it is the diagram of the second preferred embodiment of the fast start circuit 300 of integrated circuit of the present invention.Alternating current is by the startup power supply as start-up circuit 300 after fairing D32 and filter capacitor C31.The fast start circuit 300 of integrated circuit (IC) 3 comprises the impedor R31 of little resistance, the on-off element Q31 that connects impedor R31 and the mu balanced circuit 301 of connecting valve element Q31.Mu balanced circuit 301 comprises impedor R32 and a stable-pressure device 3012 of a larger resistance.Between the first end and little resistance impedor R31 of one end connecting valve element Q31 of the larger resistance impedor R32 of mu balanced circuit 301.The second end of connecting valve element Q31 between large resistance impedor R32 and stable-pressure device 3012, the starting current of the 3rd end output integrated circuit (IC) 3 of on-off element Q31.
On-off element Q31 is triode, and the collector of triode Q31 connects little resistance impedor R31 and large resistance impedor R32.The base stage of triode Q31 connects between the large resistance impedor R32 and stable-pressure device D31 of mu balanced circuit 301.The emitter output starting current of triode Q31.
The external current rectifying and wave filtering circuit 310 of fast start circuit 300 of integrated circuit (IC) 3.One end of little resistance impedor R31 connects one end of current rectifying and wave filtering circuit 310.The other end of little resistance impedor R31 connects after mu balanced circuit 301, by stable-pressure device 3012 ground connection of mu balanced circuit 301.
In the present embodiment, little resistance impedor R31 is resistance, and its resistance is very little, and large resistance impedor R32 is also resistance, and its resistance is very large, generally makes R32/R31=-1.When after electronic system energising, alternating current is after current rectifying and wave filtering circuit 310, provide base current by little resistance impedor R31, large resistance impedor R32 to triode Q31, make the Vc > Vb > Ve of triode Q31.Now triode Q31 conducting, is equivalent to short circuit, and because little resistance impedor R31 resistance is very little, larger electric current flows through little resistance impedor R31 capacitor C 34 is charged.Voltage VCC can reach the trigger voltage of integrated circuit (IC) 3 fast, and integrated circuit (IC) 3 is started working, and now the auxiliary winding of transformer T22 provides stable electric current to maintain integrated circuit (IC) 3 through diode D33 to work.Triode Q31 base stage is to connecting stable-pressure device 3012 between ground, therefore the base voltage of triode Q31 can a value toward rising, the voltage stabilizing value of stable-pressure device 3012 is less than integrated circuit (IC) 3 trigger voltages.The voltage of Design of Transformer T22 auxiliary winding output, in the operating voltage range of integrated circuit (IC) 3, and is greater than the voltage stabilizing value of voltage stabilizing element 3012.After integrated circuit (IC) 3 starts, transformer T22 auxiliary winding provides stable electric current to make VCC > Vb through diode D33, the Vc > Ve > Vb of triode Q31, triode Q31 cut-off, be equivalent to open circuit, now little resistance impedor R31 connects with large resistance impedor R32, and the power consumption of the very little therefore R31 of electric current that flows through R31 is also very little.After system stability work, if VCC because certain abnormal cause is lower than the voltage stabilizing value of stable-pressure device 3012, triode Q31 enters conducting state again.
In the present embodiment, the integrated regulator U31 that stable-pressure device 3012 comprises a regulating resistance R35 and is connected with regulating resistance R35.Therefore, fast start circuit 300 also comprises a stable-pressure device control circuit 302.Stable-pressure device control circuit 302 comprises current-limiting resistance R33 and capacitor C 32 and the discharge resistance R34 in parallel with current-limiting resistance R33.Capacitor C 32 and discharge resistance R34 parallel connection, two ends connect respectively the two poles of the earth of integrated regulator U31.Current-limiting resistance R33 resistance is larger, and the capacity of capacitor C 32 also will arrange enough large.After electronic system energising, because current-limiting resistance R33 resistance is larger, therefore the electric current on this branch road is less, and the capacity of capacitor C 32 is larger, and therefore the duration of charging of capacitor C 32 is longer.Before capacitor C 32 has been charged, principle is described in the first preferred embodiment, and triode Q31 conducting, starts integrated circuit (IC) 3 fast, and then integrated circuit (IC) 3 is normally worked, triode Q31 cut-off.After system stability work, capacitor C 32 is full of electricity, then after electric discharge, integrated regulator U31 conducting is started working.Now, the base voltage of triode Q31 reduces because of the impact of integrated regulator U31.The resistance that regulating resistance R35 is set makes triode Q31 base voltage be less than the trigger voltage of integrated circuit (IC) 3, and, when VCC is because certain abnormal cause is lower than the operating voltage of integrated circuit (IC) 3, integrated circuit (IC) 3 can not be restarted.In other embodiment, integrated regulator U31 also can field-effect transistors or triode replacement.
Shown in Fig. 4, constant-current drive circuit of the present invention (not label) comprises current rectifying and wave filtering circuit 310, integrated circuit start-up circuit, integrated circuit (IC) 3 and load circuit (not shown).Integrated circuit start-up circuit is fast start circuit 300.
The present embodiment provides a kind of method of quick startup integrated circuit (IC) 3, comprises
The first step, provides a connection to start the impedor R31 of the little resistance of power supply, and little resistance impedor R31 can provide enough large electric current to start fast integrated circuit (IC) 3.
Second step, provides an on-off element Q31, and on-off element Q31 connects little resistance impedor R31, and on-off element Q31 connects integrated circuit (IC) 3 by filter capacitor C31.
The 3rd step, provides a mu balanced circuit 301, and mu balanced circuit 301 connecting valve element Q31 comprise impedor R31 and a stable-pressure device 3012 of a large resistance, the voltage at two ends when the voltage stabilizing value that stable-pressure device 3012 is set is less than integrated circuit (IC) 3 normal work.
The 4th step, one stable-pressure device control circuit 302 is provided, stable-pressure device control circuit 302 connects stable-pressure device 3012 to control stable-pressure device 3012, and stable-pressure device control circuit 302 is respectively and is parallel to two branch roads of little resistance impedor R31 with one end with mu balanced circuit 301.
The 5th step, connect and start power supply, on-off element is in conducting state, and power supply provides starting current through on-off element Q31 for integrated circuit (IC) 3 by little resistance impedor R31, and power supply charges to stable-pressure device control circuit 302 by little resistance impedor R31 simultaneously.
The 6th step, after stable-pressure device control circuit 302 has charged, discharge, mu balanced circuit 301 started working, simultaneously integrated circuit (IC) 3 start working after voltage rise, in the time of the voltage stabilizing value that is to a certain degree greater than stable-pressure device that the voltage at integrated circuit (IC) 3 two ends rises, on-off element is closed.
Claims (10)
1. the fast start circuit of an integrated circuit, comprise the impedor of the little resistance that quick starting current is provided, it is characterized in that: fast start circuit also comprises the mu balanced circuit that connects the impedor on-off element of described little resistance and connect described on-off element, described mu balanced circuit comprises impedor and the stable-pressure device of large resistance, impedor one end of large resistance of described mu balanced circuit connects between the first end and described little resistance impedor of described on-off element, between described large resistance impedor and stable-pressure device, connect the second end of described on-off element, the starting current of the 3rd end output integrated circuit of described on-off element.
2. the fast start circuit of integrated circuit as claimed in claim 1, it is characterized in that: described on-off element is triode, the collector of described triode connects little resistance impedor and large resistance impedor, the base stage of described triode is connected between the large resistance impedor and stable-pressure device of described mu balanced circuit, the emitter output starting current of described triode.
3. the fast start circuit of integrated circuit as claimed in claim 2, is characterized in that: described stable-pressure device is diode.
4. the fast start circuit of integrated circuit as claimed in claim 3, it is characterized in that: the external current rectifying and wave filtering circuit of fast start circuit of described integrated circuit, the impedor one end of described little resistance connects one end of described current rectifying and wave filtering circuit, the impedor other end of described little resistance described mu balanced circuit in parallel and described triode, described little resistance impedor connects after described mu balanced circuit, by the diode ground connection of described mu balanced circuit.
5. the fast start circuit of integrated circuit as claimed in claim 2, it is characterized in that: described stable-pressure device comprises a regulating resistance and a voltage stabilizing element, one end of described regulating resistance connects described little resistance impedor, and the base stage of described triode connects between little resistance impedor and regulating resistance.
6. the fast start circuit of integrated circuit as claimed in claim 5, is characterized in that: described voltage stabilizing element is integrated regulator or field effect transistor or triode.
7. the fast start circuit of integrated circuit as claimed in claim 5, it is characterized in that: the fast start circuit of described integrated circuit also comprises stable-pressure device control circuit, described stable-pressure device control circuit comprises current-limiting resistance and is parallel to respectively electric capacity and the discharge resistance of described current-limiting resistance one end, one end of described electric capacity and described discharge resistance is connected with described current-limiting resistance, other end ground connection, described electric capacity one end connected with current-limiting resistance with described discharge resistance is connected with described stable-pressure device.
8. the fast start circuit of integrated circuit as claimed in claim 1, is characterized in that: described little resistance impedor is little resistance resistance, and described large resistance impedor is large impedance resistance.
9. a constant-current drive circuit, comprise current rectifying and wave filtering circuit, integrated circuit start-up circuit, integrated circuit and load circuit, it is characterized in that: described integrated circuit start-up circuit is fast start circuit, described fast start circuit comprises the impedor of the little resistance that quick starting current is provided, connect the impedor on-off element of described little resistance and connect the mu balanced circuit of described on-off element, described mu balanced circuit comprises impedor and the stable-pressure device of large resistance, impedor one end of large resistance of described mu balanced circuit connects between the first end and described little resistance impedor of described on-off element, between described large resistance impedor and stable-pressure device, connect the second end of described on-off element, the starting current of the 3rd end output integrated circuit of described on-off element.
10. the fast start circuit of integrated circuit as claimed in claim 9, it is characterized in that: described on-off element is triode, the collector of described triode connects little resistance impedor and large resistance impedor, the base stage of described triode is connected between the large resistance impedor and stable-pressure device of described mu balanced circuit, the emitter output starting current of described triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210578004.9A CN103901938A (en) | 2012-12-27 | 2012-12-27 | Quick starting circuit and constant current drive circuit of integrated circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210578004.9A CN103901938A (en) | 2012-12-27 | 2012-12-27 | Quick starting circuit and constant current drive circuit of integrated circuit |
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| CN103901938A true CN103901938A (en) | 2014-07-02 |
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| CN201210578004.9A Pending CN103901938A (en) | 2012-12-27 | 2012-12-27 | Quick starting circuit and constant current drive circuit of integrated circuit |
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Application publication date: 20140702 |