Voltage-controlled cipher scheme of constant-current source of output high-power of bipolar


Posted on Feb 5, 2014    10807

The output current range of the parameter current regulator is little, the current regulator is not tall in precision; It is small to connect the feedback adjustment type output current of the current stabilized power source in series, efficiency is lower; The steady stream source of the switch not only the circuit is complicated, the components and parts are in large quantity,


Voltage-controlled cipher scheme of constant-current source of output high-power of bipolar
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but also it is great, with discrepancy reliability to output the ripple. In view of the above-mentioned shortcomings, originally design adopting ordinary operational amplifier, cooperate with the triode to expand the voltage and the electric current is expanded, having already achieved the goal of offering the big output current, and the circuit is simple in construction, the cost is lower, precision great. Fig. 1 is a functional block diagram originally designed, are input into the constant current module that the Operational Amplifier forms by the external control voltage signal. The electric current outputted offers to load after the voltage expands the module and electric current and expands the module. The electric current samples the electric current through sampling the resistance, the acquired sampling signal is feedbacked in the module of constant current to carry on constant current via the feedback system module of voltage. Among them is expanded the module and electric current to expand the module and supply power by the voltage of pair of module of the power. Choose the on the market commonly used switching power supply to expand the module and offer the output power to the electric current, with the interference elimination in the electric capacity of joining-up in parallel of its Ausgang. Because of requiring the bipolar output, can save the cost and reduce the volume to choose the switching power supply of bipolar output. In the experiment, it is 1% of the switching power supplies that we use the nominal ripple. Use 78, 79 serial three terminal regulators to offer the voltage to expand the module in order to improve the output voltage of operational amplifier after stepping down. Fig. 2 is constant current module and voltage feedback module of operational amplifier. Since Fig. if you can`t can see since electric current Ausgang 2, gather to sample feedback signal after not dealing with for partial pressure via follower that operational amplifier make up and behind revisor, sent to reverse end and voltage control signal of the reverse adder U4 and add the output voltage V3. V3 formula which is received operational amplifier: It is that the voltage expand the circuit diagram of the module that Fig. 3 shows. Formed the difference amplifier by operational amplifier, compare the signal of system generation of constant current with output voltage with treated partial pressure and amplify, form the final output voltage. The triode in the system chooses the geminate transistor, in order to achieve the purpose of bipolar output, magnification of this systematic open loop is only decided by the ratio of R17 to R14, but after R25 and R24 partial pressure is feedbacked, it is equivalent to the amplifier, its magnification is decided by the ratio of R25 to R24. Fig. 4 shows as the expansion circuit of the electric current. The commonly used totem sliding pillar type electric current simple to use expands the method, pay attention to the choice of the power triode, and add the air-cooling fin and guarantee the output power. In this w

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