CN103116378B - Analog circuit with variable resistance - Google Patents

Analog circuit with variable resistance Download PDF

Info

Publication number
CN103116378B
CN103116378B CN201310012110.5A CN201310012110A CN103116378B CN 103116378 B CN103116378 B CN 103116378B CN 201310012110 A CN201310012110 A CN 201310012110A CN 103116378 B CN103116378 B CN 103116378B
Authority
CN
China
Prior art keywords
resistance
circuit
operational amplifier
input
output terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201310012110.5A
Other languages
Chinese (zh)
Other versions
CN103116378A (en
Inventor
赵军
王永庭
刘福博
王舜琰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Jingwei Hirain Tech Co Ltd
Original Assignee
Beijing Jingwei Hirain Tech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Jingwei Hirain Tech Co Ltd filed Critical Beijing Jingwei Hirain Tech Co Ltd
Priority to CN201310012110.5A priority Critical patent/CN103116378B/en
Publication of CN103116378A publication Critical patent/CN103116378A/en
Application granted granted Critical
Publication of CN103116378B publication Critical patent/CN103116378B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention provides an analog circuit with variable resistance. The analog circuit with the variable resistance comprises a reference resistance circuit, a control circuit and a floating ground generating circuit, wherein the reference resistance circuit is used for providing at least one reference resistor, the floating ground generating circuit is used for providing a ground terminal, and the control circuit is used for amplifying the resistance value of the reference resistor according to external data. By means of the analog circuit with the variable resistance, the variable resistance can be adjusted precisely, the occupied area on a printed circuit board (PCB) is small, and therefore cost is saved.

Description

A kind of variable resistor mimic channel
Technical field
The present invention relates to circuit field, in particular, relate to a kind of variable resistor mimic channel.
Background technology
Along with scientific and technological development, user is also growing to the demand of electronic product.In some specific occasion, as adjusting of the adjusting of the adjusting of lamplight brightness, acoustics volume, the resistive sensor of automotive electronics etc., all need to be applied to variable resistor mimic channel.
Conventionally, in prior art, variable resistor mimic channel employing relay is fixed the form of resistance, as shown in Figure 1.This circuit specifically comprises the resistance R 1-Rn of relay Drive and Control Circuit 101, relay R L1-RLn and fixed resistance value, wherein, relay Drive and Control Circuit 101 is controlled the access of different resistance by controlling different relay switchs, and then realizes the object that changes resistance value.
Obviously, variable-resistance meticulous adjustable if above-mentioned mimic channel is realized, need to select the access of multiple different resistance, corresponding, the quantity of relay also needs to increase, and it is larger that this must cause mimic channel to take the area of pcb board.
Summary of the invention
In view of this, the invention provides a kind of variable resistor mimic channel, be fixed to overcome available technology adopting relay the resistance degree of regulation that the mode of resistance resistance brings not high, take the problem that pcb board area is larger.
For achieving the above object, the invention provides following technical scheme:
A kind of variable resistor mimic channel, comprising: reference resistance circuit, control circuit and floating produce circuit, and described reference resistance circuit comprises at least one reference resistance,
Described reference resistance circuit is used for receiving external control signal, and according to the access of reference resistance described in the described control signal control receiving;
Described control circuit is used for receiving the output signal of described reference resistance circuit, and according to external data, described output signal is amplified, and exports the described circuit that produces to floatingly;
The described circuit that produces, for gathering the output signal of described control circuit, amplifies and processes the floating ground of rear conduct floatingly.
Preferably, described variable resistor mimic channel also comprises: holding circuit,
Described holding circuit is connected with the output terminal of described control circuit, for monitoring the electric current of described control circuit, in the time that described electric current exceedes preset value, disconnects described mimic channel.
Preferably, described variable resistor mimic channel also comprises: power circuit,
Described power circuit is used for receiving outside DC voltage, and the voltage that produces default amplitude is described reference resistance circuit, described control circuit and the described circuit supply that produces floatingly.
Wherein, described reference resistance circuit comprises: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance the first operational amplifier, the second operational amplifier and reference resistance analog switch
The first end of described the first resistance is connected with the first end of described the 4th resistance, the second end of described the first resistance is connected with the first end of described the 5th resistance and the first end of described the second resistance respectively, the second end of described the 5th resistance is connected with the first input end of described reference resistance analog switch, the second end of described the second resistance is connected with the second input end of described reference resistance analog switch and the first end of described the 3rd resistance respectively, the second end of described the 3rd resistance is connected with the 3rd input end and the four-input terminal of described reference resistance analog switch respectively, the first output terminal of described reference resistance analog switch respectively with the second output terminal of described reference resistance analog switch, the 3rd output terminal of described reference resistance analog switch, the output terminal of described the second operational amplifier, the first end of the first end of described the 7th resistance and described the 8th resistance is connected, the 4th output terminal of described reference resistance analog switch is connected with the first input end of described the second operational amplifier and the second end of described the 7th resistance respectively, the second input end of described the second operational amplifier and the first input end of described the first operational amplifier all connect described floating ground, the second input end of described the first operational amplifier is connected with the second end of described the 4th resistance and the first end of described the 6th resistance respectively, the second end of described the 6th resistance is connected with the output terminal of described the first operational amplifier, and as the output terminal of described reference resistance circuit.
Wherein, described control circuit comprises: DA chip, the 3rd operational amplifier, four-operational amplifier, the 9th resistance and the tenth resistance,
The input end of described DA chip is connected with the output terminal of described reference resistance circuit, the first output terminal of described DA chip is connected with the output terminal of described the 3rd operational amplifier and the first end of described the 9th resistance respectively, the second output terminal of described DA chip is connected with the first input end of described the 3rd operational amplifier, the second end of described the 9th resistance is connected with the first input end of described four-operational amplifier and the first end of described the tenth resistance respectively, the output terminal of described four-operational amplifier is connected with the second end of described the tenth resistance, and as the output terminal of described control circuit, the second input end of described the 3rd operational amplifier and the second end of described four-operational amplifier all connect described floating ground.
Wherein, the described circuit that produces comprises floatingly: the 5th operational amplifier, the 12 resistance and the 13 resistance,
The first end of described the 12 resistance is connected with the output terminal of described four-operational amplifier, the second end of described the 12 resistance is connected with described the 5th first input end of operational amplifier and the first end of described the 13 resistance respectively, the second input end grounding of described the 5th operational amplifier, the output terminal of described the 5th operational amplifier is connected with the second end of described the 13 resistance, and as described floating the output terminal that produces circuit.
Wherein, described holding circuit comprises: photo-coupler, the 11 resistance and relay,
The first end of described the 11 resistance is connected with the first input end of described photo-coupler and the output terminal of described control circuit respectively, the second end of described the 11 resistance is connected with the second input end of described photo-coupler, the second end of described the tenth resistance and the input end of described relay respectively, and the output terminal of described relay is as one end of described variable mimic channel;
Peripheral control unit receives the detection signal of the output terminal output of described photo-coupler, and according to unlatching and the shutoff of relay described in described detection signal control.
Wherein, described power circuit comprises: modular power source, the first three terminal regulator and the second three terminal regulator,
Described modular power source receives external direct current, the positive output end of described modular power source is connected with the input end of described the first three terminal regulator and the input end of described the second three terminal regulator respectively, and as the first output plus terminal of described power circuit, the output terminal of described the first three terminal regulator is as the second output plus terminal of described power circuit, floating ground described in the ground connection termination of described the first three terminal regulator, the output terminal of described the second three terminal regulator is as the 3rd output plus terminal of described power circuit, the earth terminal ground connection of described the second three terminal regulator, the negative output terminal of described modular power source is as the first output negative terminal of described power circuit, the earth terminal ground connection of described modular power source.
Known via above-mentioned technical scheme, compared with prior art, the invention provides a kind of variable resistor mimic channel, comprising: reference resistance circuit, control circuit and floating produce circuit, wherein, reference resistance circuit is used for providing at least one reference resistance, produce circuit floatingly and be used for providing floatingly and hold, described control circuit amplifies the resistance of described reference resistance according to external data, has realized variable-resistance meticulous adjustable, the area that takies pcb board is less, and then has saved cost.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the structural representation of variable resistor mimic channel conventional in prior art;
The structural representation of a kind of variable resistor mimic channel that Fig. 2 provides for the embodiment of the present invention;
The another structural representation of a kind of variable resistor mimic channel that Fig. 3 provides for the embodiment of the present invention;
The structural representation of reference resistance circuit in a kind of variable resistor mimic channel that Fig. 4 provides for the embodiment of the present invention;
The structural representation of control circuit in a kind of variable resistor mimic channel that Fig. 5 provides for the embodiment of the present invention;
In a kind of variable resistor mimic channel that Fig. 6 provides for the embodiment of the present invention, produce the structural representation of circuit floatingly;
The structural representation of holding circuit in a kind of variable resistor mimic channel that Fig. 7 provides for the embodiment of the present invention;
The structural representation of power circuit in a kind of variable resistor mimic channel that Fig. 8 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
Refer to accompanying drawing 2, the structural representation of a kind of variable resistor mimic channel providing for the embodiment of the present invention, comprise: reference resistance circuit 201, control circuit 202 and floating produce circuit 203, wherein, described reference resistance circuit 201 comprises at least one reference resistance.
Described reference resistance circuit 201 is for receiving external control signal, and according to the access of reference resistance described in the described control signal control receiving.Described control circuit 202 is for receiving the output signal of described reference resistance circuit 201, and according to external data, described output signal amplified, and exports the described circuit 203 that produces to floatingly.The described circuit 203 that produces, for gathering the output signal of described control circuit, amplifies the rear conduct of processing and holds floatingly floatingly.
Adopt variable resistor mimic channel provided by the invention, effectively solved the resistance degree of regulation that mode that available technology adopting relay is fixed resistance resistance brings not high, take the problem that pcb board area is larger.
At this; the embodiment of the present invention also provides reference resistance circuit 201, control circuit 202 and floating the specific implementation circuit that produces circuit 203; here it should be noted that; this physical circuit is just in order to illustrate; but be not limited to this, other circuit that can realize inwardly at above-described embodiment are all within protection scope of the present invention.
Refer to Fig. 4, the structural representation of reference resistance circuit in a kind of variable resistor mimic channel providing for the embodiment of the present invention, in this reference resistance circuit 201, four reference resistances are adopted, i.e. the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, except this, also comprise: the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first operational amplifier U1, the second operational amplifier U2 and reference resistance analog switch U3.
Concrete, the annexation of each device is:
The first end of described the first resistance R 1 is connected with the first end of described the 4th resistance R 4, the second end of described the first resistance R 1 is connected with the first end of described the 5th resistance R 5 and the first end of described the second resistance R 2 respectively, the second end of described the 5th resistance R 5 is connected with the first input end of described reference resistance analog switch U3, the second end of described the second resistance R 2 is connected with the second input end of described reference resistance analog switch U3 and the first end of described the 3rd resistance R 3 respectively, the second end of described the 3rd resistance R 3 is connected with the 3rd input end and the four-input terminal of described reference resistance analog switch U3 respectively, the first output terminal of described reference resistance analog switch U3 respectively with the second output terminal of described reference resistance analog switch U3, the 3rd output terminal of described reference resistance analog switch U3, the output terminal of described the second operational amplifier U2, the first end of the first end of described the 7th resistance R 7 and described the 8th resistance R 8 is connected, the 4th output terminal of described reference resistance analog switch U3 is connected with the first input end of described the second operational amplifier U2 and the second end of described the 7th resistance R 7 respectively, the second input end of described the second operational amplifier U2 and the first input end of described the first operational amplifier U1 all connect floating ground, the second input end of described the first operational amplifier U1 is connected with the second end of described the 4th resistance R 4 and the first end of described the 6th resistance R 6 respectively, the second end of described the 6th resistance R 6 is connected with the output terminal of described the first operational amplifier U1, and as the output terminal of described reference resistance circuit.
Refer to Fig. 5, the structural representation of control circuit in a kind of variable resistor mimic channel providing for the embodiment of the present invention, this control circuit 202 comprises: DA chip U4, the 3rd operational amplifier U5, four-operational amplifier U6, the 9th resistance R 9 and the tenth resistance R 10.
Concrete, the annexation of each device is:
The input end of described DA chip U4 is connected with the output terminal of described reference resistance circuit 201, the first output terminal of described DA chip U4 is connected with the output terminal of described the 3rd operational amplifier U5 and the first end of described the 9th resistance R 9 respectively, the second output terminal of described DA chip U4 is connected with the first input end of described the 3rd operational amplifier U5, the second end of described the 9th resistance R 9 is connected with the first input end of described four-operational amplifier U6 and the first end of described the tenth resistance R 10 respectively, the output terminal of described four-operational amplifier U6 is connected with two ends of described the tenth resistance R 10, and as the output terminal of described control circuit 202, the second input end of described the 3rd operational amplifier U5 and the second end of described four-operational amplifier U6 all connect floating ground.
Refer to Fig. 6, the structural representation of circuit is provided in a kind of variable resistor mimic channel providing for the embodiment of the present invention floatingly, this produces circuit 203 floatingly and comprises: the 5th operational amplifier U7, the 12 resistance R the 12 and the 13 resistance R 13.
Concrete, the annexation of each device is:
The first end of described the 12 resistance R 12 is connected with the output terminal of described four-operational amplifier U6, the second end of described the 12 resistance R 12 is connected with described the 5th first input end of operational amplifier U7 and the first end of described the 13 resistance R 13 respectively, the second input end grounding of described the 5th operational amplifier U7, the output terminal of described the 5th operational amplifier U7 is connected with the second end of described the 13 resistance R 13, and as described floating the output terminal that produces circuit 203.
Now, in conjunction with the annexation of each circuit, the principle of work of variable resistor mimic channel provided by the invention is introduced:
External digital signal selects to access which reference resistance (R1-R4) by controlling reference resistance analog switch U3.Whole circuit is divided into three grades of amplifier sections, refer to Fig. 5, wherein, the first operational amplifier U1 and the 4th resistance R 4, the 6th resistance R 6 form the first order and amplify, DA chip U4 and the 3rd operational amplifier U5 form the second level and amplify, and four-operational amplifier U6 and the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R 11 form the third level and amplify.Be specially, the first operational amplifier U1 will deliver to the reference edge of DA chip U4, i.e. first input end after the voltage amplification on reference resistance.DA chip U4 and the 3rd operational amplifier U5 form DA output module, according to the difference of outer input data, the output of DA chip U4 also changes accordingly, again because the output voltage of the 3rd operational amplifier U5 is determined jointly by DA data and voltage Vref, and the output voltage of the 3rd operational amplifier U5 is exported after amplifying by four-operational amplifier U6 again.Now, add predeterminated voltage U at the first input end of operational amplifier U1 and the output terminal of four-operational amplifier U6, the electric current that artifical resistance is flow through in setting is I, has:
U=IR always=IR benchmark+ xIR benchmarkk formula (1)
Wherein: R alwaysfor the all-in resistance of simulation.
R benchmarkfor the value of reference resistance (be R1, R2, R3, any one in tetra-reference resistances of R4.Can be R1||R4, (R1+R2) || R4, (R1+R2+R3) || in these four groups of R4, R4 any one group, corresponding, the range ability difference of each group representative).
X is the percentage that the output valve of DA chip U4 takes range, span (0≤x≤1), and in the present embodiment, the resolution of choosing DA chip U4 is 14, wherein, N is the data of controlling DA output.Here it should be noted that, resolution can also be 8,10, and 12,16 etc., the higher analog electrical resistance of figure place is also meticulous, and lower analog electrical resistance is more coarse, according to the demand of Surveying Actual Precision, can select voluntarily, but be not limited to 14 DA chips that this circuit is selected.
K is the enlargement factor of resistance value control module, for this circuit, for convenient for example, set in this circuit R6=47 kilo-ohm, R4=20 kilo-ohm, R10=2.7 kilo-ohm, R9=264.4 Europe, enlargement factor K=24.Except this, in this circuit, enlargement factor K can replace different resistance and change, and the range of corresponding artifical resistance can become, then this is not described in detail.
Bringing above parameter into formula (1) obtains:
U=IR always=IR benchmark+ xIR benchmark24 formulas (2)
Be R always=R benchmark(1+x24) formula (3)
So the all-in resistance of simulation determines by reference resistance and the data of controlling DA output, the precision of artifical resistance is also relevant with the resolution of reference resistance and DA.The reference resistance adopting due to the present invention has four kinds, corresponding four kinds of ranges, that is:
Reference resistance 10 Europe, corresponding 10 Europe---250 Europe
Reference resistance 200 Europe, corresponding 200 Europe---5K
Reference resistance 2K, corresponding 2K---50K
Reference resistance 20K, corresponding 20K---500K
Be not difficult to find out from above-mentioned, the resolution of artifical resistance is relevant with x value, and in the time of N=1, if reference resistance 10 Europe, bring into and calculate R total formula, resistance resolution is: 0.0146 Europe, in like manner when reference resistance 200 Europe, resistance resolution is: 0.293 Europe, when reference resistance 2K, resistance resolution is: 2.93 Europe, when reference resistance 20K, resistance resolution is 29.3 Europe), fully demonstrate resistance value meticulous adjustable.And the element that circuit adopts can not increase along with the increase of resolution.Visible, to the invention provides variable resistor mimic channel, amplifies the resistance of described reference resistance according to external data by control circuit, has realized variable-resistance meticulous adjustablely, and the area that takies pcb board is less, and then has saved cost.
Here it should be added that, wherein, produce circuit is the voltage that gathers four-operational amplifier U6 by the input end of the 5th operational amplifier U7 floatingly, after processing, as the earth terminal of other operational amplifiers, connects floating ground by amplification.
Embodiment bis-
On the basis of the embodiment providing in the invention described above, refer to Fig. 3, the another structural representation of a kind of variable resistor mimic channel providing for the embodiment of the present invention, can also comprise holding circuit 204.
Wherein, described holding circuit 204 is connected with the output terminal of described control circuit 202, for monitoring the electric current of described control circuit 202, in the time that described electric current exceedes preset value, disconnects described mimic channel.
Concrete, refer to Fig. 7, the structural representation of holding circuit in a kind of variable resistor mimic channel providing for the embodiment of the present invention, described holding circuit comprises: photo-coupler U8, the 11 resistance R 11 and relay J 1.
Concrete, the annexation of each device is:
The first end of described the 11 resistance R 11 is connected with the first input end of described photo-coupler U8 and the output terminal of described control circuit respectively, the second end of described the 11 resistance R 11 is connected with the second input end, the second end of described the tenth resistance R 10 and the input end of described relay J 1 of described photo-coupler U8 respectively, and the output terminal of described relay J 1 is as one end of described variable mimic channel.
Peripheral control unit receives the detection signal of the output terminal output of described photo-coupler U8, and according to unlatching and the shutoff of relay J 1 described in described detection signal control.
Principle of work is:
The 11 resistance R 11 Real-Time Monitorings flow through the electric current of artifical resistance, and in the time flowing through the electric current of resistance and exceed limit value, photo-coupler U8 output state flip, controls peripheral control unit relay J 1 is disconnected, protective resistance mimic channel.Except this; disconnect after certain hour at circuit, all right pilot relay J1 closure, if electric current recovers normal; resistance simulation circuit just works on; if now or over-current state, cut off again circuit, repeatedly after preset times; over-current state does not also disappear; just permanent cut-out circuit, until re-power, thereby reach overcurrent protection.
Meanwhile, while exceeding certain voltage due to RH and RL two ends again, (in the present embodiment, certain voltage is 34V) will cause large electric current, at this moment carry out overcurrent protection.Because overvoltage causes overcurrent, this holding circuit also plays the effect of overvoltage crowbar indirectly again.
Here it should be noted that, in the time that circuit is normally worked, holding circuit is inoperative.In the time of electric current overrate in output loop, holding circuit just plays a role.
Except this, the embodiment of the present invention also provides a kind of power circuit 205, and this power circuit is used for receiving outside DC voltage, and the voltage that produces default amplitude is described reference resistance circuit, described control circuit and the described circuit supply that produces floatingly.
At this, it should be noted that, this power circuit 205 is the devices that external direct current converted to the output of predeterminated voltage value, its output voltage can regulate power circuit according to the actual needs and change.In following specific embodiment, the voltage of default amplitude is 5V.Except this, those skilled in the art, according to thought of the present invention, all will change in specific embodiments and applications, but all within protection scope of the present invention.
Concrete, what this power circuit 205 adopted is DCDC module, the DC voltage that the input voltage of this DCDC module is 9 ~ 18V, and the output voltage after this DCDC module is the positive and negative 17V voltage of isolating with input voltage (being the direct current of above-mentioned 9 ~ 18V).Wherein, positive 17V voltage, through two 5V linear voltage regulators, produces two 5V voltages, wherein, the ground of first 5V linear voltage regulator and joining, that is floatingly, this 5V changes with respect to floating ground; The earth terminal of second 5V linear voltage regulator be physically connected.
Preferably, as shown in Figure 8, described power circuit 205 comprises: modular power source 2051, the first three terminal regulator I1 and the second three terminal regulator I2.
Each device annexation is:
Described modular power source 2051 receives external direct current, the positive output end of described modular power source is connected with the input end of described the first three terminal regulator I1 and the input end of described the second three terminal regulator I2 respectively, and as the first output plus terminal of described power circuit, the output terminal of described the first three terminal regulator I1 is as the second output plus terminal of described power circuit, floating ground described in the ground connection termination of described three terminal regulator I1, the output terminal of described the second three terminal regulator I2 is as the 3rd output plus terminal of described power circuit, the earth terminal ground connection of described three terminal regulator I2, the negative output terminal of described modular power source is as the first output negative terminal of described power circuit, the earth terminal ground connection of described modular power source.
Here it should be noted that, for produce the output of circuit floatingly, ground is common earth terminal floatingly, also can be understood as, be a reference voltage that produces circuit generation floatingly floatingly, from physics " " different, the two need to distinguish.
Conventionally, two kinds of the have+15V of supply voltage of external power source input and 5V, wherein, 5V is for photo-coupler U8 power supply.+ 15V power supply is powered to modular power source.The positive and negative 17V voltage that modular power source produces is given each operational amplifier power supply, and modular power source 2051 is by the first three terminal regulator I1 and second three terminal regulator I2(the present embodiment, three terminal regulator can be 7805 three terminal regulators) voltage of generations+5V powers to DA chip and analog switch.
In sum: compared with prior art, the invention provides a kind of variable resistor mimic channel, comprise: reference resistance circuit, control circuit and floating the circuit that produces, wherein, reference resistance circuit is used for providing at least one reference resistance, produces circuit floatingly and is used for providing floatingly and holds, described control circuit amplifies the resistance of described reference resistance according to external data, realized variable-resistance meticulous adjustablely, the area that takies pcb board is less, and then has saved cost.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the device providing for embodiment, because its method providing with embodiment is corresponding, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of provided embodiment, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle provided in this article and features of novelty.

Claims (7)

1. a variable resistor mimic channel, is characterized in that, comprising: reference resistance circuit, control circuit and floating produce circuit, and described reference resistance circuit comprises at least one reference resistance,
Described reference resistance circuit is used for receiving external control signal, and according to the access of reference resistance described in the described control signal control receiving;
Described control circuit is used for receiving the output signal of described reference resistance circuit, and according to external data, described output signal is amplified, and exports the described circuit that produces to floatingly;
The described circuit that produces, for gathering the output signal of described control circuit, amplifies and processes the floating ground of rear conduct floatingly;
Described control circuit comprises: DA chip, the 3rd operational amplifier, four-operational amplifier, the 9th resistance and the tenth resistance,
The input end of described DA chip is connected with the output terminal of described reference resistance circuit, the first output terminal of described DA chip is connected with the output terminal of described the 3rd operational amplifier and the first end of described the 9th resistance respectively, the second output terminal of described DA chip is connected with the first input end of described the 3rd operational amplifier, the second end of described the 9th resistance is connected with the first input end of described four-operational amplifier and the first end of described the tenth resistance respectively, the output terminal of described four-operational amplifier is connected with the second end of described the tenth resistance, and as the output terminal of described control circuit, the second input end of described the 3rd operational amplifier and the second input end of described four-operational amplifier all connect described floating ground.
2. variable resistor mimic channel according to claim 1, is characterized in that, also comprises: holding circuit,
Described holding circuit is connected with the output terminal of described control circuit, for monitoring the electric current of described control circuit, in the time that described electric current exceedes preset value, disconnects described mimic channel.
3. variable resistor mimic channel according to claim 1, is characterized in that, also comprises: power circuit,
Described power circuit is used for receiving outside DC voltage, and the voltage that produces default amplitude is described reference resistance circuit, described control circuit and the described circuit supply that produces floatingly.
4. variable resistor mimic channel according to claim 1, it is characterized in that, described reference resistance circuit comprises: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first operational amplifier, the second operational amplifier and reference resistance analog switch
The first end of described the first resistance is connected with the first end of described the 4th resistance, the second end of described the first resistance is connected with the first end of described the 5th resistance and the first end of described the second resistance respectively, the second end of described the 5th resistance is connected with the first input end of described reference resistance analog switch, the second end of described the second resistance is connected with the second input end of described reference resistance analog switch and the first end of described the 3rd resistance respectively, the second end of described the 3rd resistance is connected with the 3rd input end and the four-input terminal of described reference resistance analog switch respectively, the first output terminal of described reference resistance analog switch respectively with the second output terminal of described reference resistance analog switch, the 3rd output terminal of described reference resistance analog switch, the output terminal of described the second operational amplifier, the first end of the first end of described the 7th resistance and described the 8th resistance is connected, the 4th output terminal of described reference resistance analog switch is connected with the first input end of described the second operational amplifier and the second end of described the 7th resistance respectively, the second input end of described the second operational amplifier and the first input end of described the first operational amplifier all connect described floating ground, the second input end of described the first operational amplifier is connected with the second end of described the 4th resistance and the first end of described the 6th resistance respectively, the second end of described the 6th resistance is connected with the output terminal of described the first operational amplifier, and as the output terminal of described reference resistance circuit.
5. variable resistor mimic channel according to claim 1, is characterized in that, the described circuit that produces comprises floatingly: the 5th operational amplifier, the 12 resistance and the 13 resistance,
The first end of described the 12 resistance is connected with the output terminal of described four-operational amplifier, the second end of described the 12 resistance is connected with described the 5th first input end of operational amplifier and the first end of described the 13 resistance respectively, the second input end grounding of described the 5th operational amplifier, the output terminal of described the 5th operational amplifier is connected with the second end of described the 13 resistance, and as described floating the output terminal that produces circuit.
6. variable resistor mimic channel according to claim 2, is characterized in that, described holding circuit comprises: photo-coupler, the 11 resistance and relay,
The first end of described the 11 resistance is connected with the first input end of described photo-coupler and the output terminal of described control circuit respectively, the second end of described the 11 resistance is connected with the second input end of described photo-coupler, the second end of described the tenth resistance and the input end of described relay respectively, and the output terminal of described relay is as one end of described variable resistor mimic channel;
Peripheral control unit receives the detection signal of the output terminal output of described photo-coupler, and according to unlatching and the shutoff of relay described in described detection signal control.
7. variable resistor mimic channel according to claim 3, is characterized in that, described power circuit comprises: modular power source, the first three terminal regulator and the second three terminal regulator,
Described modular power source receives external direct current, the positive output end of described modular power source is connected with the input end of described the first three terminal regulator and the input end of described the second three terminal regulator respectively, and as the first output plus terminal of described power circuit, the output terminal of described the first three terminal regulator is as the second output plus terminal of described power circuit, floating ground described in the ground connection termination of described the first three terminal regulator, the output terminal of described the second three terminal regulator is as the 3rd output plus terminal of described power circuit, the earth terminal ground connection of described the second three terminal regulator, the negative output terminal of described modular power source is as the first output negative terminal of described power circuit, the earth terminal ground connection of described modular power source.
CN201310012110.5A 2013-01-11 2013-01-11 Analog circuit with variable resistance Active CN103116378B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310012110.5A CN103116378B (en) 2013-01-11 2013-01-11 Analog circuit with variable resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310012110.5A CN103116378B (en) 2013-01-11 2013-01-11 Analog circuit with variable resistance

Publications (2)

Publication Number Publication Date
CN103116378A CN103116378A (en) 2013-05-22
CN103116378B true CN103116378B (en) 2014-12-10

Family

ID=48414787

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310012110.5A Active CN103116378B (en) 2013-01-11 2013-01-11 Analog circuit with variable resistance

Country Status (1)

Country Link
CN (1) CN103116378B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104880963A (en) * 2014-10-27 2015-09-02 上海葩星信息科技有限公司 Resistor simulator
CN104318881B (en) * 2014-11-10 2017-06-23 京东方科技集团股份有限公司 A kind of testing impedance circuit, integrated drive electronics and display device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2149669Y (en) * 1991-05-14 1993-12-15 党建伟 Monolithic device ac bridge balance indicator
US6650173B1 (en) * 1999-11-16 2003-11-18 Stmicroelectronics S.R.L. Programmable voltage generator
CN1710430A (en) * 2005-07-07 2005-12-21 中国航天科技集团公司第五研究院第五一四研究所 Digital simulation impedance normalization device
CN101282095A (en) * 2008-05-15 2008-10-08 中国科学院电工研究所 Inertial shock motor drive power supply
CN201336757Y (en) * 2009-01-22 2009-10-28 陈咸丰 Multi-way constant-current power supply used for high-power LED light source
CN202150837U (en) * 2011-07-25 2012-02-22 杭州亿恒科技有限公司 High-performance digitized gain fine adjustment circuit
CN102841260A (en) * 2012-09-24 2012-12-26 哈尔滨工业大学 DC microresistivity measuring system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2149669Y (en) * 1991-05-14 1993-12-15 党建伟 Monolithic device ac bridge balance indicator
US6650173B1 (en) * 1999-11-16 2003-11-18 Stmicroelectronics S.R.L. Programmable voltage generator
CN1710430A (en) * 2005-07-07 2005-12-21 中国航天科技集团公司第五研究院第五一四研究所 Digital simulation impedance normalization device
CN101282095A (en) * 2008-05-15 2008-10-08 中国科学院电工研究所 Inertial shock motor drive power supply
CN201336757Y (en) * 2009-01-22 2009-10-28 陈咸丰 Multi-way constant-current power supply used for high-power LED light source
CN202150837U (en) * 2011-07-25 2012-02-22 杭州亿恒科技有限公司 High-performance digitized gain fine adjustment circuit
CN102841260A (en) * 2012-09-24 2012-12-26 哈尔滨工业大学 DC microresistivity measuring system

Also Published As

Publication number Publication date
CN103116378A (en) 2013-05-22

Similar Documents

Publication Publication Date Title
CN101562443B (en) Overvoltage protection circuit and liquid crystal display device drive circuit
CN101119028A (en) Electrical source input overvoltage protection circuit
CN104423408B (en) Manostat
CN103116378B (en) Analog circuit with variable resistance
CN108767810A (en) A kind of current-limiting circuit and current-limiting apparatus
CN105633905A (en) Overvoltage and under-voltage protection circuit
CN206077778U (en) LED blood pressure lowering drive circuits
CN203734283U (en) Power supply protection circuit and power supply device
CN203894394U (en) Power supply circuit and electronic apparatus provided with current monitoring function
CN203456860U (en) IPM module protection circuit with adjustable current and air conditioner
CN103298210B (en) Overvoltage protection circuit and electronic device with same
TWI325671B (en) Circuit and method for short circuit protection
CN101963821B (en) Start-up circuit and bandgap voltage reference circuit with same
CN205720464U (en) Electronic load device
CN204833041U (en) Three -terminal steady voltage source can be monitored to wide region
CN209055869U (en) A kind of linear voltage-stabilizing circuit
CN103592991B (en) Circuit protected by Power Limitation type for ambipolar linear voltage regulator
CN101471564A (en) Voltage control circuit
CN202977969U (en) Efficient protection circuit of laser coupling power source
CN205490123U (en) Large current output's among high voltage integrated circuit overcurrent protect device
CN101551689A (en) Constant-current source circuit for hot resistance calibration system of device aging screening machine
CN108037787A (en) A kind of A/D chip input voltages limiter protection circuit
CN201667038U (en) Stable state constant current circuit structure
CN103091543A (en) Current detection circuit, constant current circuit and battery charging and discharging protective system
CN203616368U (en) A power supply module used for a single-phase electric energy meter

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: Analog circuit with variable resistance

Effective date of registration: 20150901

Granted publication date: 20141210

Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee

Pledgor: Beijing Jingwei Hirain Technologies Co., Ltd.

Registration number: 2015990000748

Denomination of invention: Analog circuit with variable resistance

Effective date of registration: 20150901

Granted publication date: 20141210

Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee

Pledgor: Beijing Jingwei Hirain Technologies Co., Ltd.

Registration number: 2015990000748

PLDC "enforcement, change and cancellation of contracts on pledge of patent right or utility model"
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20191023

Granted publication date: 20141210

Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee

Pledgor: Beijing Jingwei Hirain Technologies Co., Ltd.

Registration number: 2015990000748

Date of cancellation: 20191023

Granted publication date: 20141210

Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee

Pledgor: Beijing Jingwei Hirain Technologies Co., Ltd.

Registration number: 2015990000748

PC01 Cancellation of the registration of the contract for pledge of patent right
CP03 "change of name, title or address"

Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020

Patentee after: Beijing Jingwei Hengrun Technology Co., Ltd

Address before: 8 / F, block B, No. 11, Anxiang Beili, Chaoyang District, Beijing 100101

Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd.

CP03 "change of name, title or address"