CN204028738U - A kind of constant pressure and flow circuit - Google Patents
A kind of constant pressure and flow circuit Download PDFInfo
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- CN204028738U CN204028738U CN201420394258.XU CN201420394258U CN204028738U CN 204028738 U CN204028738 U CN 204028738U CN 201420394258 U CN201420394258 U CN 201420394258U CN 204028738 U CN204028738 U CN 204028738U
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Abstract
The utility model provides a kind of constant pressure and flow circuit, includes: a transformer; One first current rectifying and wave filtering circuit, it is connected to the low-pressure side of transformer; One Circuit tuning, it is connected to the outgoing side of described first current rectifying and wave filtering circuit, for regulation output electric current and output voltage; One current comparison circuit, one input end is connected with a current setting circuit, and its another input end is connected to the output terminal of Circuit tuning by a current sampling circuit, the output terminal of current comparison circuit is connected to an input end of described Circuit tuning; One voltage comparator circuit, one input end is connected with one for setting the voltage setting circuit of output voltage, its another input end is connected to the output terminal of Circuit tuning by a voltage sampling circuit, the output terminal of voltage comparator circuit is connected to an input end of Circuit tuning.The utility model can realize the output of constant pressure and flow, can arrange different output currents and output voltage according to different loads.
Description
Technical field
The utility model relates to mu balanced circuit, particularly relates to a kind of constant pressure and flow circuit.
Background technology
Traditional power supply is constant pressure source or constant current source normally, and voltage and the electric current of output are non-adjustable, and compatibility is lower.Existing linear voltage-stabilizing circuit is made up of several essential parts such as stabilivolt, triode, sample circuit, error amplifying circuits usually, output voltage is obtained by sample circuit, and compare with reference voltage, after comparative result is amplified by error amplifying circuit, control the conducting degree of triode, make output voltage keep stable.The quiescent point of stabilivolt and triode varies with temperature greatly, and leakage current is large, and affect the output of triode greatly, thus output voltage poor anti jamming capability, precision is low, and the regulating power of circuit is limited.
Summary of the invention
The utility model be solve existing power supply output voltage and output current non-adjustable, the technical matters that output voltage poor anti jamming capability, precision are low, provides a kind of and can export different voltage and the constant pressure and flow circuit that anti-interference ability is strong, precision is higher exporting different electric current continuously continuously.
In order to solve the problems of the technologies described above, the utility model adopts technical scheme as described below.A kind of constant pressure and flow circuit, include: a transformer, it is for being converted to low tension by civil power; One first current rectifying and wave filtering circuit, it is connected to the low-pressure side of described transformer, carries out rectifying and wave-filtering for the alternating current exported described transformer; One Circuit tuning, it is connected to the outgoing side of described first current rectifying and wave filtering circuit, for regulation output electric current and output voltage; One output circuit, it is connected with described Circuit tuning, for connecting load to output voltage filtering; One current sampling circuit, is connected to the outgoing side of described Circuit tuning, for gathering the output current of described Circuit tuning; One current setting circuit, presets output current for setting one; One current comparison circuit, it is connected with described Circuit tuning, current sampling circuit and current setting circuit respectively, compare for output current that described current sampling circuit is gathered and described default output current, and output voltage signal controls described Circuit tuning to make the constant output current of described Circuit tuning is accordingly described default output current; One voltage sampling circuit, is connected to the outgoing side of described Circuit tuning, for gathering the output voltage of described Circuit tuning; One voltage setting circuit, for setting a pre-set output voltage; One voltage comparator circuit, it is connected with described Circuit tuning, described voltage sampling circuit and voltage setting circuit respectively, compare for the output voltage that gathered by described voltage sampling circuit and described pre-set output voltage, output voltage signal controls described Circuit tuning to make the output voltage of described Circuit tuning constant for described pre-set output voltage.
Its further technical scheme is, described current sampling circuit comprises current sampling resistor and the first differential amplifier circuit, described current sampling resistor is connected between described Circuit tuning and described output circuit with the output current of described Circuit tuning of sampling, described first differential amplifier circuit is used for the output voltage of sampling to carry out differential amplification, its first input end is connected between described Circuit tuning and described current sampling resistor, a reference voltage circuit is also connected with in this first input end, second input end of described first differential amplifier circuit is connected between described current sampling resistor and described output circuit.
Its further technical scheme is, described voltage sampling circuit comprises the first voltage sample resistance, the second voltage sample resistance and the second differential amplifier circuit, the first input end of described second differential amplifier circuit is connected to the input end of described output circuit by described first voltage sample resistance, also be connected with reference voltage circuit described in this first input end, the second input end of described second differential amplifier circuit is connected with Power Groud by described second voltage sample resistance.
Its further technical scheme is, is connected with one first voltage follower between described current comparison circuit and described current setting circuit.
Its further technical scheme is, is connected with one second voltage follower between described voltage comparator circuit and described voltage setting circuit.
Its further technical scheme is, described Circuit tuning is a NMOS field effect transistor, the drain electrode of described NMOS field effect transistor is connected to the outgoing side of described first current rectifying and wave filtering circuit, its source electrode is connected with described output circuit, and its grid connects respectively at described current comparison circuit and described voltage comparator circuit.
Its further technical scheme is, described output circuit comprises the 7th filtering circuit and loading interfaces, described 7th filtering circuit is parallel to the two ends of described voltage sampling circuit, the positive voltage terminal of described loading interfaces is connected to the output terminal of described 7th filtering circuit, and the negative voltage side of described loading interfaces is connected with Power Groud.
Its further technical scheme is that described output circuit also comprises protection circuit, and it is parallel to the output terminal of described 7th filtering circuit.
Its further technical scheme is, described transformer comprises input winding, first and exports winding and the second output winding, described first exports winding is connected with described first current rectifying and wave filtering circuit, described second exports winding switching the second current rectifying and wave filtering circuit, described second current rectifying and wave filtering circuit is used for carrying out rectifying and wave-filtering to the described second alternating current exporting winding output, output terminal in described second current rectifying and wave filtering circuit is connected with mu balanced circuit, and described mu balanced circuit is for exporting the voltage of+12V ,-12V and+1.24V.
Its further technical scheme is, described reference voltage circuit comprises reference voltage chip, and this reference voltage chip is preferably LM4140 cake core.
Advantageous Effects of the present utility model is: this constant pressure and flow circuit presets output current and a pre-set output voltage by current setting circuit and voltage setting circuit setting one, the electric current that current sampling circuit collects by current comparison circuit and default output current compare, export accordingly to adjust output current for presetting output current, the voltage that voltage sampling circuit collects by voltage comparator circuit and pre-set output voltage compare, export accordingly to adjust voltage stabilization for pre-set output voltage, the output of constant pressure and flow can be realized, according to different loads, different output currents and output voltage can be set.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model constant pressure and flow circuit.
Fig. 2 is the utility model one embodiment constant pressure and flow circuit theory schematic diagram.
Embodiment
For setting forth thought of the present utility model and object, below in conjunction with the drawings and specific embodiments, the utility model is described further.
Shown in figure 1, constant pressure and flow circuit provided by the utility model includes a transformer 10, and it is for being converted to low-voltage AC by 220V High Level AC Voltage; One first current rectifying and wave filtering circuit 20, it is connected to the low-pressure side of transformer 10, carries out rectifying and wave-filtering for the alternating current exported transformer 10; One Circuit tuning 30, it is connected to the outgoing side of the first current rectifying and wave filtering circuit 20, for regulation output electric current and output voltage; One output circuit 50, it is connected with Circuit tuning 30, for connecting load to output voltage filtering; One current sampling circuit 40, is connected to the outgoing side of Circuit tuning 30, for gathering the output current of this Circuit tuning 30; One current setting circuit 61, it presets output current for setting one; One current comparison circuit 60, it is connected with Circuit tuning 30, current sampling circuit 40 and current setting circuit 61 respectively, compare for output current that current sampling circuit 40 is gathered and default output current, and output voltage signal controls Circuit tuning 30 to make the constant output current of Circuit tuning 30 for presetting output current accordingly; One voltage sampling circuit 70, it is connected to the outgoing side of Circuit tuning 30, for gathering the output voltage of this Circuit tuning 30; One voltage setting circuit 81, it is for setting a pre-set output voltage; One voltage comparator circuit 60, it is connected with Circuit tuning 30, voltage sampling circuit 70 and voltage setting circuit 81 respectively, compare for output voltage that voltage sampling circuit 70 is gathered and pre-set output voltage, and output voltage signal controls Circuit tuning 30 to make the output voltage of Circuit tuning 30 constant in pre-set output voltage accordingly.
Constant pressure and flow circuit working principle provided by the utility model is: after output circuit 50 connects load, the alternating current of 220V is by transformer 10 step-down, then be DC voltage by the first current rectifying and wave filtering circuit 20 rectifying and wave-filtering, be load supplying by output circuit 50 after Circuit tuning 30 adjusts, the output current that current sampling circuit 40 is sampled by current comparison circuit 60 and the default output current that current setting circuit 61 sets compare, output voltage signal controls Circuit tuning 30 to make Circuit tuning 30 constant output current for presetting output current accordingly, the output voltage that voltage sampling circuit 70 is sampled by voltage comparator circuit 60 and the pre-set output voltage that voltage setting circuit 81 sets compare, output voltage signal controls Circuit tuning 30 to make output voltage for pre-set output voltage accordingly, thus realize constant pressure and flow output, can the size of regulation output electric current by current setting circuit 61, can the size of regulation output voltage by voltage setting circuit 81.
Shown in composition graphs 2, be a specific implementation of the present utility model, not as the restriction of the constant pressure and flow circuit provided the utility model.
Concrete, transformer 10 comprises input winding T, first and exports winding T1 and second output winding T2, first alternating current exporting winding T1 output exports Circuit tuning 30 to after the first current rectifying and wave filtering circuit 20 rectifying and wave-filtering, second exports winding T2 is used for powering for current setting circuit 61, current sampling circuit 40, current comparison circuit 60, voltage setting circuit 81, voltage sampling circuit 70 and voltage comparator circuit 80, and the first output winding T1 and second exports winding T2 to be kept apart.
First current rectifying and wave filtering circuit 20 exports Circuit tuning 30 to after exporting the ac voltage rectifier filtering of winding T1 output by first of transformer 10, it comprises the first rectifier bridge stack circuit DB2 and the first filtering circuit, this the first rectifier bridge stack circuit DB2 is preferably GBU1010 integrated chip, its two interchanges pin is connected to positive source and the power cathode of the first output winding T1, its positive voltage pin is connected with the first filtering circuit, and negative voltage pin is connected with Power Groud.First filtering circuit is parallel to the outgoing side of the first rectifier bridge stack circuit DB2.This first filtering circuit is specially electric capacity C67 in parallel and electric capacity C68.
Second current rectifying and wave filtering circuit 21 is for exporting the AC rectification filtering of winding T2 output to second, it comprises the second rectifier bridge stack circuit DB1, the second filtering circuit.Second rectifier bridge stack circuit DB1 is preferably KBP307 full-bridge rectification integrated chip, and its two interchanges pin is connected to positive source and the power cathode of the second output winding T2.Second filtering circuit is used for carrying out filtering to the output voltage of the second rectifier bridge stack circuit DB1, it comprises electric capacity C25, electric capacity C23, electric capacity C32 and electric capacity C30, wherein, after electric capacity C25 is in parallel with electric capacity C23, one end is connected to the positive voltage pin of the second rectifier bridge stack circuit DB1, the other end is connected with ground GND, electric capacity C32 is connected with the negative voltage pin of one end after electric capacity C30 parallel connection with the second rectifier bridge stack circuit DB1, and the other end is connected with ground GND.
Mu balanced circuit 22 is converted to+12V for the direct current exported by the second current rectifying and wave filtering circuit 21,-12V and+1.24V many groups operating voltage, wherein+1.24V is reference voltage REF, it comprises the first voltage stabilizing chip U4, second voltage stabilizing chip U7, 3rd voltage stabilizing chip U3 and reference voltage chip IC 1, first voltage stabilizing chip U4 is preferably MC7812ACT cake core, for exporting+12V voltage, its input pin IN is connected with the link of electric capacity C23 with electric capacity C25, its grounding pin GND is connected with ground GND, its output pin OUT is connected with the 3rd filtering circuit, 3rd filtering circuit is used for the voltage filter exported the first voltage stabilizing chip U4, with stable output+12V voltage, it comprises electric capacity C22 and electric capacity C24, after electric capacity C22 and electric capacity C24 parallel connection, one end is connected to the output pin OUT of the first voltage stabilizing chip U4, the other end is connected with ground GND.Second voltage stabilizing chip U7 is preferably MC7912ACT cake core, for exporting-12V voltage, its input pin IN is connected with the link of electric capacity C30 with electric capacity C32, its grounding pin GND is connected with ground GND, its output pin OUT is connected with the 4th filtering circuit, 4th filtering circuit is used for the voltage filter exported the second voltage stabilizing chip U7, with stable output-12V voltage, it comprises electric capacity C28 and electric capacity C29, after electric capacity C28 is in parallel with electric capacity C29, one end is connected to the output pin OUT of the second voltage stabilizing chip U7, and the other end is connected with ground GND.3rd voltage stabilizing chip U3 is preferably MC7805ACT cake core, for transferring+15V voltage to+5V voltage, its input pin IN is connected to the positive voltage pin of the second rectifier bridge stack circuit DB1 by the 5th filtering circuit, its grounding pin GND is connected with ground GND, its output pin OUT is connected with the 6th filtering circuit, 5th filtering circuit is used for the voltage filter exported the positive voltage pin of the second rectifier bridge stack circuit DB1, it comprises electric capacity C3 and electric capacity C4, after electric capacity C3 is in parallel with electric capacity C4, one end is connected to the input pin IN of the 3rd voltage stabilizing chip U3, the other end is connected with ground GND, 6th filtering circuit is used for the+5V voltage filter exported the 3rd voltage stabilizing chip U3, it comprises electric capacity C5 and electric capacity C6, electric capacity C5 is connected with the output pin OUT of one end after electric capacity C6 parallel connection with the 3rd voltage stabilizing chip U3, the other end is connected with ground GND.Reference voltage chip IC 1 is preferably LM4140, for being reference voltage REF1.24V by+5V voltage transitions, its input voltage pin VIN and enable pin EN is all connected with the link of the 3rd voltage stabilizing chip U3 output pin OUT with electric capacity C6 with electric capacity C5, its enable pin EN is connected with ground GND by a filter capacitor C60, its pin 1, 4, 7, 8 are all connected with ground GND, NC is unsettled for its pin, its output pin REF is by filter capacitor C61 output reference voltage REF1.24V, this filter capacitor C61 one end is connected to the output pin REF of reference voltage chip IC 1, the other end is connected with ground GND, for the reference voltage REF filtering to output.
Circuit tuning 30 adjusts electric current and the voltage of output for the magnitude of voltage that the magnitude of voltage that exports according to current comparison circuit 60 and voltage comparator circuit 80 export, it is preferably a NMOS field effect transistor Q1, its drain electrode is connected with the output terminal of the first current rectifying and wave filtering circuit 20, its grid is connected with Power Groud PGND by a current-limiting resistance R14, simultaneously, current comparison circuit 60 is all connected in the grid of NMOS field effect transistor Q1 with voltage comparator circuit 80, its source electrode is connected with output circuit 50, its grid is connected by a resistance R20 with its source electrode, this resistance R20 provides bias voltage for NMOS field effect transistor Q1.
Current sampling circuit 40 comprises current sampling resistor R22 and the first differential amplifier circuit, current sampling resistor R22 is connected between Circuit tuning 30 and output circuit 50 with the output current of Circuit tuning 30 of sampling, first differential amplifier circuit is used for the voltage difference at current sampling resistor R22 two ends to carry out differential amplification, its first input end is connected between Circuit tuning 30 and current sampling resistor R22, also be connected with a reference voltage circuit in this first input end, the second input end of the first differential amplifier circuit is connected between current sampling resistor R22 and output circuit 50.Concrete, first differential amplifier circuit comprises the first integrated transporting discharging U5, the in-phase input end of this first integrated transporting discharging U5 flows into hold with the electric current of current sampling resistor R22 and is connected, its inverting input is connected with the outflow of bus current end of sampling resistor R22, its output terminal is connected with current comparison circuit 60, one first feedback circuit is connected with between its inverting input and its output terminal, this first feedback circuit is for stablizing the quiescent point of the first integrated transporting discharging U5 and suppressing high-frequency self-excitation, it comprises an a resistance R6 and electric capacity C17, this resistance R6 is in parallel with this electric capacity C17, normal phase input end in the first integrated transporting discharging U5 is also connected with a reference voltage circuit, this reference voltage circuit is for improving the reference voltage of circuit, to make circuit working within the scope of a required voltage, it comprises reference voltage chip IC 1, an one electric capacity C31 and resistance R11, this electric capacity C31 is connected with the output pin REF of said reference voltage chips IC1 with one end after this resistance R11 parallel connection, the other end is connected with the in-phase input end of the first integrated transporting discharging U5.
The voltage compare of current comparison circuit 60 for the voltage of the first integrated transporting discharging U5 output and current setting circuit 61 are exported, with the grid of control NMOS field effect transistor Q1, the electric current making it export is setting value, it comprises the first comparer U9, its in-phase input end is connected with the output terminal of current setting circuit 61, its inverting input is connected with the output terminal of the first integrated transporting discharging U5, its output terminal is connected with the negative electrode of a clamp diode D4, the anode of this clamp diode D4 is connected with the grid of NMOS field effect transistor Q1, for adjusting the voltage of the grid of NMOS field effect transistor Q1, with Circuit tuning output current.One second feedback circuit is connected with between the in-phase input end of the first comparer U9 and its output terminal, this second feedback circuit is used for doing zero compensation for whole circuit, it comprises resistance R21 and the electric capacity C58 of series connection, the free end of electric capacity R21 is connected with the output terminal of the first comparer U9, and the free end of electric capacity C58 is connected with the in-phase input end of the first comparer U9.Preferably, an input resistance R19 is provided with between the output terminal and the in-phase input end of the first comparer U9 of current setting circuit 61, this input resistance R19 plays the effect of current limliting and protection the first comparer U9, a filter capacitor C59 is connected with at the tie point of electric capacity C58 and input resistance R19, the other end ground connection GND of this filter capacitor C59, resistance R17 in parallel and electric capacity C46 is provided with between the first comparer U9 inverting input at the output terminal of the first integrated transporting discharging U5, this resistance R17 and electric capacity C46 is for accelerating the transient response speed of the first comparer U9, one first protection circuit is provided with between the first comparer U9 in-phase input end and its inverting input, this first protection circuit is for the protection of the first comparer U9, it comprises diode D6 and diode D5, the anode of diode D6 is connected with the in-phase input end of the first comparer U9, its negative electrode is connected with the inverting input of the first comparer U9, the anode of diode D5 is connected with the inverting input of the first comparer U9, its negative electrode is connected with the in-phase input end of the first comparer U9.
Current setting circuit 61 presets output current for setting one, and preferably, the output terminal of this current setting circuit 61 is connected with one first voltage follower U2, and this first voltage follower U2 plays the effect of isolation buffer.Concrete, current setting circuit 61 comprises potentiometer RW3, potentiometer RW1 and the potentiometer RW2 of three series connection, potentiometer RW3 one end is connected with+5V voltage, its other end is connected with potentiometer RW1 one end, the potentiometer RW1 other end is connected with potentiometer RW2 one end, the other end of potentiometer RW2 is connected with ground GND, the lead-out terminal of potentiometer RW1 is connected to the in-phase input end of the first voltage follower U2, preferably, be provided with a filter capacitor C10 at the lead-out terminal of potentiometer RW1 and between potentiometer RW2 and ground GND link, play the effect of filtering.The in-phase input end of the first voltage follower U2 is connected with the output terminal of current setting circuit 61, and its inverting input and its output terminal are connected to form negative feedback, and its output terminal is connected to the in-phase input end of the first comparer U9.
Voltage sampling circuit 70 comprises the first voltage sample resistance R24, the second voltage sample resistance R41 and the second differential amplifier circuit, the first input end of the second differential amplifier circuit is connected to the input end of output circuit by the first voltage sample resistance R24, also be connected with a reference voltage circuit in this first input end, the second input end of the second differential amplifier circuit is connected with Power Groud PGND by the second voltage sample resistance R41.Concrete, second differential amplifier circuit comprises the second integrated transporting discharging U11, the in-phase input end of this second integrated transporting discharging U11 is connected with the forward voltage end of load, its inverting input is connected with the negative voltage end of load, its output terminal is connected with voltage comparator circuit 80, one the 3rd feedback circuit is connected with between its inverting input and its output terminal, 3rd feedback circuit is for stablizing the quiescent point of the second integrated transporting discharging U11 and suppressing high-frequency self-excitation, it comprises an a resistance R34 and electric capacity C75, this resistance R34 is in parallel with this electric capacity C75, in-phase input end in the second integrated transporting discharging U11 is also connected with a said reference potential circuit, this reference voltage circuit is for improving the reference voltage of circuit, to make circuit working within the scope of a required voltage, it comprises reference voltage chip IC 1, an one electric capacity C63 and resistance R28, this electric capacity C63 is connected with the output pin REF of said reference voltage chips IC1 with one end after this resistance R28 parallel connection, the other end is connected with the in-phase input end of the second integrated transporting discharging U11.
Voltage comparator circuit 80 compares for the pre-set output voltage voltage of the second integrated transporting discharging U11 output and voltage setting circuit 81 set, output voltage is with the grid of control NMOS field effect transistor Q1 accordingly, the voltage making it export is pre-set output voltage, it comprises the second comparer U8, the in-phase input end of this second comparer U8 is connected with the output terminal of voltage setting circuit 81, its inverting input is connected with the output terminal of the second integrated transporting discharging U11, its output terminal is connected with the negative electrode of a clamp diode D3, the anode of this clamp diode D3 is connected with the grid of NMOS field effect transistor Q1, for adjusting the voltage of the grid of NMOS field effect transistor Q1, with Circuit tuning output voltage.One the 4th feedback circuit is connected with between the in-phase input end of the second comparer U8 and its output terminal, 4th feedback circuit is used for doing zero compensation for whole circuit, it comprises resistance R16 and the electric capacity C45 of series connection, the free end of electric capacity R16 is connected with the output terminal of the second comparer U8, and the free end of electric capacity C45 is connected with the in-phase input end of the second comparer U8.Preferably, an input resistance R15 is provided with between the output terminal and the inverting input of the second comparer U8 of the second integrated transporting discharging U11, this input resistance R15 plays the effect of current limliting and protection the second comparer U8, a filter capacitor C101 is connected with at the tie point of electric capacity C45 and input resistance R15, the other end ground connection GND of this filter capacitor C101, resistance R13 in parallel and electric capacity C33 is provided with between the output terminal and the in-phase input end of the second comparer U8 of voltage setting circuit 81, this resistance R13 and electric capacity C33 is for accelerating the transient response speed of the second comparer U8, one second protection circuit is provided with between the in-phase input end and its inverting input of the second comparer U8, this second protection circuit is for the protection of the second comparer U8, it comprises diode D1 and diode D2, the anode of diode D1 is connected with the in-phase input end of the second comparer U8, its negative electrode is connected with the inverting input of the second comparer U8, the anode of diode D2 is connected with the inverting input of the second comparer U8, its negative electrode is connected with the in-phase input end of the second comparer U8.
Voltage setting circuit 81 is for setting a pre-set output voltage, and preferably, the output terminal of this voltage setting circuit 81 is connected with one second voltage follower U1, and this second voltage follower U1 plays the effect of isolation buffer.Concrete, voltage setting circuit 81 comprises the potentiometer RW13 of three series connection, potentiometer RW11 and potentiometer RW14, potentiometer RW13 one end is connected with+5V voltage, its other end is connected with potentiometer RW11 one end, the potentiometer RW11 other end is connected with potentiometer RW14 one end, the other end of potentiometer RW14 is connected with ground GND, the lead-out terminal of potentiometer RW11 is connected to the in-phase input end of the second voltage follower U1, preferably, a filter capacitor C12 is provided with at the lead-out terminal of potentiometer RW11 and between potentiometer RW14 and ground GND link, play the effect of filtering.The in-phase input end of the second voltage follower U1 is connected with the output terminal of current setting circuit 61, and its inverting input and its output terminal are connected to form negative feedback, and its output terminal is connected to the in-phase input end of the second comparer U8.
Output circuit 50 for output voltage filtering and connect load, it comprises the 7th filtering circuit and loading interfaces, 7th filtering circuit is parallel to the two ends of voltage sampling circuit 70, the positive voltage terminal of loading interfaces P1 is connected to the output terminal of the 7th filtering circuit, and the negative voltage side of loading interfaces P1 is connected with Power Groud PGND.Concrete, 7th filtering circuit is used for output voltage filtering, and it comprises electric capacity C65 and electric capacity C69, and electric capacity C65 and electric capacity C69 is connected in parallel, its one end link is connected with the current output terminal of current sampling resistor R22, and its other end link is connected with Power Groud PGND.Loading interfaces P1 is used for external load, and it is parallel to the two ends of the 7th filtering circuit.Preferably; be parallel with a protection circuit at the output terminal of the 7th filtering circuit, this protection circuit is used for the protection circuit when load reversal connection and avoids damaging, and it is specially a diode D11; its negative electrode is connected with the output terminal of the output terminal of the 7th filtering circuit, and its anode is connected with Power Groud PGND.
In some embodiments, also be provided with display circuit, this display circuit is used for display translation electric current and output voltage, and it comprises voltage table and reometer, voltage table is parallel to the two ends of loading interfaces P1, and reometer one end is connected between sampling resistor 22 and the 7th filtering circuit.
The course of work of the present utility model is: load is connected to loading interfaces P1, adjustment current setting circuit 61 sets one and presets output current, adjustment voltage setting circuit 81 sets a pre-set output voltage, 220V alternating current is after transformer 10 step-down, direct-current working volts are exported after the first current rectifying and wave filtering circuit 20 rectifying and wave-filtering, for NMOS field effect transistor Q1 powers, output+12V after the second current rectifying and wave filtering circuit 21 rectifying and wave-filtering,-12V and+1.24V many groups operating voltage, for current sampling circuit 40, voltage sampling circuit 70, current setting circuit 61, voltage setting circuit 81, current comparison circuit 60 and voltage comparator circuit 80 are powered, current sampling circuit 40 gathers output current, compared by the first comparer U9 and default output current, the voltage that the output voltage of the first comparer U9 was dragged down by clamp diode D4 or drawn high NMOS field effect transistor Q1 grid with regulation output electric current for presetting output current.Voltage sampling circuit 70 gathers output voltage, compared by the second comparer U8 and pre-set output voltage, the voltage that the output voltage of the second comparer U8 dragged down or drew high NMOS field effect transistor Q1 grid by clamp diode D3 with regulation output voltage for pre-set output voltage.The utility model can realize constant current constant voltage and export, and output voltage and output current continuously adjustabe, voltage sampling circuit and current sampling circuit adopt differential amplifier circuit, and temperature drift is little, and precision is high.
Be described in detail the utility model above, apply specific case herein and set forth structural principle of the present utility model and embodiment, above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (10)
1. a constant pressure and flow circuit, is characterized in that, includes:
One transformer, it is for being converted to low tension by civil power;
One first current rectifying and wave filtering circuit, it is connected to the low-pressure side of described transformer, carries out rectifying and wave-filtering for the alternating current exported described transformer;
One Circuit tuning, it is connected to the outgoing side of described first current rectifying and wave filtering circuit, for regulation output electric current and output voltage;
One output circuit, it is connected with described Circuit tuning, for connecting load to output voltage filtering;
One current sampling circuit, is connected to the outgoing side of described Circuit tuning, for gathering the output current of described Circuit tuning;
One current setting circuit, presets output current for setting one;
One current comparison circuit, it is connected with described Circuit tuning, current sampling circuit and current setting circuit respectively, compare for output current that described current sampling circuit is gathered and described default output current, and output voltage signal controls described Circuit tuning to make the constant output current of described Circuit tuning is accordingly described default output current;
One voltage sampling circuit, is connected to the outgoing side of described Circuit tuning, for gathering the output voltage of described Circuit tuning;
One voltage setting circuit, for setting a pre-set output voltage;
One voltage comparator circuit, it is connected with described Circuit tuning, described voltage sampling circuit and voltage setting circuit respectively, compare for the output voltage that gathered by described voltage sampling circuit and described pre-set output voltage, output voltage signal controls described Circuit tuning to make the output voltage of described Circuit tuning constant for described pre-set output voltage.
2. constant pressure and flow circuit as claimed in claim 1, it is characterized in that, described current sampling circuit comprises current sampling resistor and the first differential amplifier circuit, described current sampling resistor is connected between described Circuit tuning and described output circuit with the output current of described Circuit tuning of sampling, described first differential amplifier circuit is used for the output voltage of sampling to carry out differential amplification, its first input end is connected between described Circuit tuning and described current sampling resistor, a reference voltage circuit is also connected with in this first input end, second input end of described first differential amplifier circuit is connected between described current sampling resistor and described output circuit.
3. constant pressure and flow circuit as claimed in claim 2, it is characterized in that, described voltage sampling circuit comprises the first voltage sample resistance, the second voltage sample resistance and the second differential amplifier circuit, the first input end of described second differential amplifier circuit is connected to the input end of described output circuit by described first voltage sample resistance, also be connected with reference voltage circuit described in this first input end, the second input end of described second differential amplifier circuit is connected with Power Groud by described second voltage sample resistance.
4. constant pressure and flow circuit as claimed in claim 1, is characterized in that, be connected with one first voltage follower between described current comparison circuit and described current setting circuit.
5. constant pressure and flow circuit as claimed in claim 1, is characterized in that, be connected with one second voltage follower between described voltage comparator circuit and described voltage setting circuit.
6. constant pressure and flow circuit as claimed in claim 1, it is characterized in that, described Circuit tuning is a NMOS field effect transistor, the drain electrode of described NMOS field effect transistor is connected to the outgoing side of described first current rectifying and wave filtering circuit, its source electrode is connected with described output circuit, its grid is connected with Power Groud, and meanwhile, described current comparison circuit and described voltage comparator circuit are all connected in the grid of described NMOS field effect transistor.
7. constant pressure and flow circuit as claimed in claim 1, it is characterized in that, described output circuit comprises the 7th filtering circuit and loading interfaces, described 7th filtering circuit is parallel to the two ends of described voltage sampling circuit, the positive voltage terminal of described loading interfaces is connected to the output terminal of described 7th filtering circuit, and the negative voltage side of described loading interfaces is connected with Power Groud.
8. constant pressure and flow circuit as claimed in claim 7, it is characterized in that, described output circuit also comprises protection circuit, and it is parallel to the output terminal of described 7th filtering circuit.
9. constant pressure and flow circuit as claimed in claim 1, it is characterized in that, described transformer comprises input winding, first and exports winding and the second output winding, described first exports winding is connected with described first current rectifying and wave filtering circuit, described second exports winding switching the second current rectifying and wave filtering circuit, described second current rectifying and wave filtering circuit is used for carrying out rectifying and wave-filtering to the described second alternating current exporting winding output, output terminal in described second current rectifying and wave filtering circuit is connected with mu balanced circuit, and described mu balanced circuit is for exporting the voltage of+12V ,-12V and+1.24V.
10. constant pressure and flow circuit as claimed in claim 2, it is characterized in that, described reference voltage circuit comprises reference voltage chip, and this reference voltage chip is preferably LM4140 cake core.
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| CN201420394258.XU CN204028738U (en) | 2014-07-16 | 2014-07-16 | A kind of constant pressure and flow circuit |
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| CN201420394258.XU CN204028738U (en) | 2014-07-16 | 2014-07-16 | A kind of constant pressure and flow circuit |
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| CN105487586A (en) * | 2015-12-29 | 2016-04-13 | 吉林大学 | Portable dual-ring feedback constant current source module |
| CN106033226A (en) * | 2015-03-18 | 2016-10-19 | 联想(北京)有限公司 | Voltage stabilizer and electronic device |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
| WO2018023719A1 (en) * | 2016-08-05 | 2018-02-08 | 韩性峰 | Current-limiting circuit having low power consumption and high power |
| CN108459650A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant voltage control loop and electronic load |
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| CN106033226A (en) * | 2015-03-18 | 2016-10-19 | 联想(北京)有限公司 | Voltage stabilizer and electronic device |
| CN106033226B (en) * | 2015-03-18 | 2017-11-28 | 联想(北京)有限公司 | A kind of stable-pressure device and electronic equipment |
| CN105487586A (en) * | 2015-12-29 | 2016-04-13 | 吉林大学 | Portable dual-ring feedback constant current source module |
| WO2018023719A1 (en) * | 2016-08-05 | 2018-02-08 | 韩性峰 | Current-limiting circuit having low power consumption and high power |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
| CN108459650A (en) * | 2017-02-22 | 2018-08-28 | 苏州普源精电科技有限公司 | Constant voltage control loop and electronic load |
| CN108459650B (en) * | 2017-02-22 | 2023-09-12 | 普源精电科技股份有限公司 | Constant voltage control loop and electronic load |
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