CN201163760Y

CN201163760Y - Electronic potentiometer module

Info

Publication number: CN201163760Y
Application number: CNU2007200857956U
Authority: CN
Inventors: 程杰保
Original assignee: Individual
Current assignee: WUHAN CHUANGJIAYUAN ELECTRONIC CO Ltd
Priority date: 2007-07-11
Filing date: 2007-07-11
Publication date: 2008-12-10
Anticipated expiration: 2017-07-11

Abstract

An electronic potentiometer module comprises a key switch, a square-wave generator, an accelerating circuit, a key identification circuit, a counter, a collector electrode open-circuit NPN triode array and a resistance network which are connected together through electrical connection so as to form an intact general electronic potentiometer device with passive output. An attached drawing is a basic structure functional block diagram of the electronic potentiometer module, wherein the (1) key switch, the (2) square-wave generator, the (3) accelerating circuit, the (4) key identification circuit, the (5) counter, the (6) triode array and the (7) resistance network are shown. Except for being directly used in a DC stabilized voltage power supply to carry out output voltage adjustment, the electronic potentiometer module can also be used as a general electronic potentiometer, and is widely used in other electronic fields so as to replace the prior mechanical potentiometer. The electronic potentiometer module comprises the formation modes of (1) discrete component and integrated circuit, (2) singlechip taken as core, (3) modularization and (4) integration.

Description

Electronic potentiometer module

Affiliated technical field

The utility model is all simulated mechanical potentiometer with electronic circuit, and reach the electrical characteristic similar with mechanical potentiometer, can in adjustable D.C. regulated power supply, regulate output voltage as precision potentiometer, replace the traditional mechanical potentiometer, also can be used as one fully independently electronic potentiometer be used for other electronic applications.

Background technology

Present adjustable D.C. regulated power supply, regulate output voltage and almost all use mechanical potentiometer, mechanical potentiometer exists mechanical wear, pressure regulation difficulty (multiturn potentiometer from minimum resistance to maximum value needs ten circles), output voltage to be difficult to many disadvantages such as accurate adjustment.

There is a kind of method to be: realize the output voltage adjustment with toggle switch, resistor network and some auxiliary circuits, but this method still to have mechanical wear, has mechanical breakpoint in addition, under the situation that much continuitys of output voltage is had requirement, can not use.

Summary of the invention

Conception of the present utility model is to use the electronics rolling counters forward, the corresponding resistance of count value gating resistor network of output, and the desired resistance value of this count value and output voltage and output voltage is corresponding one by one.Potentiometer only has two exit points and is passive, can be connected with module with three terminal regulator, transistor, various D.C. regulated power supply chip, realizes the adjustment of D.C. regulated power supply output voltage.

Concrete technical scheme is (referring to an accompanying drawing 1), two buttons (1) are set, respectively as adding key and subtracting key, press as a button, promptly start square-wave generator (2) vibration, the square wave of output is delivered to and can be preset several forward-backward counter (5) counting, simultaneously button is distinguished circuit (4) the may command counter counting that adds deduct accordingly, but the needed precision decision of the figure place root jade pendant of counter, the base stage of each output termination NPN type triode battle array (6) of counter, the emitter of triode battle array is all interconnected, open collector connecting resistance network (7), the network resistor other end is all in parallel, and the emitter of the parallel connected end of network resistor and triode battle array is variable-resistance two end points of electronic potentiometer.Counter is output as the 8-4-2-1 coding, makes the minimum number of network resistor.When the continuous button time about 2 seconds, start accelerating circuit (3), the resistance value of network resistor will change fast.

Because network resistor is all in parallel, when adding key, the rolling counters forward value increases, and the resistance value of electronic potentiometer reduces, and when subtracting key, the resistance value of electronic potentiometer increases, and some circuit needs this operational version.

Another kind of scheme is (referring to an accompanying drawing 2): meet an adjustable accurate shunt regulator TL431 at variable-resistance two end points of electronic potentiometer, like this when when adding key, the dynamic electric resistor of TL431 output increases, by subtracting key, the dynamic electric resistor of TL431 output reduces, and this meets the use habit of general potentiometer.

The TL431 maximum working voltage is 36V, if require its voltage that bears to surpass this value, can adopt scheme shown in the accompanying drawing 3, with two (or many) TL431 series connection, to satisfy various voltage needs.

The beneficial effects of the utility model are:

1. except that two buttons, do not have other mechanical components and parts, will improve greatly the useful life of potentiometer;

2. the potentiometer precision only by the resistor network decision, can accomplish very high by precision;

3. output is passive, can have the common potentiometer of polarity to use as one;

4. the resistance value of potentiometer can be remembered easily, is provided with, preserved;

5. entire circuit is independent fully, and all elements all are extra small and microelectronic elements, is easy to realize modularization or integrated;

6. can make the universal electronic potentiometer of various precision and specification, be applied to other electronic applications, replace traditional mechanical potentiometer;

7. can realize Long-distance Control and control automatically easily.

8. Shu Chu resistance value all is continuous in whole adjustable range.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is a basic principle block diagram of the present utility model.

Fig. 2 is the output principle schematic diagram of the general potentiometer normal regulating of the utility model method.

Fig. 3 is in " general potentiometer normal regulating method " scheme, and the voltage that electronic potentiometer is required exceeds the solution of the voltage that single TL431 can bear, and " DB " is photoelectrical coupler.

Fig. 4 is the circuit theory diagrams that the utility model is made of discrete component and integrated circuit.

Fig. 5 is the circuit theory diagrams that the utility model is made of single-chip microcomputer.

Among Fig. 1, (1) button, (2) square-wave generator, (3) accelerating circuit, (4) button is distinguished circuit, (5) can preset several forward-backward counters, (6) triode battle array, (7) resistor network.

Fig. 1 is used to illustrate technical pattern feature of the present utility model.

Among Fig. 2 and Fig. 3, " Rw " is resistor network, and " BG " is the triode battle array, and " J " represents the multidigit counter, is typical outward element " integrated three-terminal regulator " in the frame of broken lines, also can external triode or other voltage-output element.

Embodiment

In output scheme shown in Figure 2, because Rw is all in parallel, when count value increased, output resistance reduced, according to the TL431 operation principle, in normal range of operation (2.5V-36V), when the resistance value between Vref and the A reduced, the dynamic electric resistor between K and the A increased, when the resistance value between Vref and the A increases, dynamic electric resistor between K and the A reduces, and both have accurate linear relationship.Rw presses the 8-4-2-1 coding and arranges appropriate resistance.

Among Fig. 3, the output voltage of two or more TL431 can allow collocation arbitrarily as required in the operating voltage range separately.Illustrate output scheme shown in Figure 3 below and implement principle

(the V that ignores for convenience of description, TL431 _KAStarting voltage 2.5V) establishes direct current stabilized voltage power supply output maximum voltage 50.0V, connect the TL431-1 resistor network earlier, when count value is added to 299, the V of TL431-1 from 0 _KABe raised to 29.9V from 0V, at this moment add 1 again, just connect photoelectrical coupler, make the V of TL431-2 _KABe raised to fixed value 30.0V, simultaneously the V of TL431-1 _KADrop to 0V, addend more after this, the V of TL431-2 _KARemain unchanged the V of TL431-1 _KAChange once more, bear 20.0V and 30.0V respectively up to being added to 500, two TL431, output voltage is its series connection sum, i.e. 50.0V.

In the specific embodiment of Fig. 4, S1 and S2 add key and subtract key, press as a key, promptly start the square-wave generator of forming by elements such as IC3B, counter (IC) pulse count, its output make (BG) conducting accordingly, thereby make corresponding network resistor (RW) output in parallel.When continuous button about 2 seconds, start working by the accelerating circuit that elements such as IC3A are formed, make the frequency of oscillation of square-wave generator improve about ten times.IC1A, IC1B, IC1C, IC1D and IC2A, elements such as IC2B form button and debate not and the key interlock circuit, and when two keys were all pressed, back button was invalid.Elements such as BG1 are formed and added inhibit circuit, and are when count value reaches the maximum of setting, invalid by adding key.Diode (D) is to subtract inhibit circuit, and is when count value is zero, invalid by subtracting key.

In the specific embodiment of Fig. 5, with single chip computer AT 89C2051 is that core constitutes the simple electronic potentiometer, except that having Fig. 4 all functions, also has the output resistance memory function, to satisfy the mechanical potentiometer use habit, the output maximum is 11 8-4-2-1 sign indicating numbers, if more high accuracy can be exported figure place with two-4 lines or the expansion of three-8 line decoders.

Claims

1. electronic potentiometer module is the electronic potentiometer of all being made up of electronic component, it is characterized in that: will add, subtract the add-subtract control end that key switch and square-wave generator, button distinguish that circuit connects, button is distinguished the output termination counter of circuit, the counting end of the output termination counter of square-wave generator, each output of counter is connected respectively with the base stage of open-collector NPN type triode battle array, the collector electrode of triode battle array is connected with the resistance of resistor network correspondence respectively, constitutes universal electronic potentiometer device complete, that output is passive.

2. electronic potentiometer module according to claim 1 is characterized in that: resistor network can be connected on the V of TL431 _REFEnd and A end.

3. electronic potentiometer module according to claim 1 is characterized in that: this electronic potentiometer can directly be connected with module with three terminal regulator, transistor, various D.C. regulated power supply chip.

4. electronic potentiometer module according to claim 1 is characterized in that: when the electronic potentiometer output voltage exceeds the voltage that single TL431 can bear, TL431 can many series connection pressure regulation respectively.

5. electronic potentiometer module according to claim 1 is characterized in that: with single chip computer AT 89C2051 is that core constitutes the simple electronic potentiometer, and the serial ports of the SCL of storage chip 24C02, SDA pin and single-chip microcomputer connects.