Operational amplifier circuit for realizing linear adjustable power supply

Abstract

The utility model relates to an operational amplifier circuit for realizing a linear adjustable power supply, which comprises a reference module, a gain module and an output module, the output end of the reference module is connected with the input end of the output module, and the output end of the gain module is connected with the input end of the output module through a diode D1. According to the utility model, the use of complex digital control or a transformer can be avoided, and the radiation interference to the power supply and the introduced ripples are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of operational amplifier circuit for realizing linear adjustable power supply. BACKGROUND

[0002] Traditional adjustable power supply mainly uses switching power supply technology, by searching, the patent document with application No.201510759618.0 discloses a kind of adjustable power supply circuit, including power transformer, its primary side winding receives alternating current and generates first alternating voltage on its first secondary winding, first bridge rectifier rectifies first alternating voltage, voltage at a first node coupled to the output terminal of first bridge rectifier is clamped by stabilizing diode to form first stable voltage, and the first stable voltage is used as the power supply voltage of an operational amplifier.Although the implementation is simple, but introduces higher ripple and noise, and cost and volume are larger.

[0003] In view of the above-mentioned defects, the present design person actively researches and innovates, in order to create a new structure for realizing linear adjustable power supply operational amplifier circuit, so that it has more industrial utilization value. CONTENT OF UTILITY MODEL

[0004] To solve the above technical problems, the utility model aims at providing a kind of operational amplifier circuit for realizing linear adjustable power supply.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of operational amplifier circuit for realizing linear adjustable power supply, including reference module, gain module and output module, the output of reference module is connected with the input of output module, the output of gain module is connected with the input of output module by diode D1;

[0007] Gain module includes chip U1C, the eighth pin of chip U1C is connected with the input of output module by diode D1, the eighth pin of chip U1C is connected with one end of resistance R9, the other end of resistance R9 is connected with resistance R7 and then grounded, while resistance R7 is connected with capacitor C5 in parallel, resistance R8 is connected with the ninth pin of chip U1C, while resistance R8 is connected with resistance R7, resistance R8 is connected with VCTRL end, the tenth pin of chip U1C is connected with DC12V end by resistance R4, the tenth pin of chip U1C is grounded by resistance R5, and resistance R5 is connected with capacitor C4 in parallel;

[0008] The output module comprises a chip U1B, the fifth pin of the chip U1B is connected with the output end of the reference module, the sixth pin of the chip U1B is grounded through a resistor R14, the sixth pin of the chip U1B is connected with the seventh pin of the chip U1B through a resistor R15, the seventh pin of the chip U1B is connected with the base of a triode Q1, the collector of the triode Q1 is connected with DC12V, the emitter of the triode Q1 is connected with the emitter of a triode Q2, the collector of the triode Q2 is connected with the base of the triode Q2 through a resistor R16, and the collector of the triode Q2 is grounded, the base of the triode Q2 is connected with the anode of a diode ZD1, the cathode of the diode ZD1 is connected with the resistor R15 and the seventh pin of the chip U1B, the fifth pin of the chip U1B is connected with the anode of a diode D1, and the emitter of the triode Q1 is connected with the OUTPUT end.

[0009] Preferably, the operational amplifier circuit for realizing a linear adjustable power supply, the model numbers of the chip U1B and the chip U1C are TLE2144IDW.

[0010] Preferably, the operational amplifier circuit for realizing a linear adjustable power supply, the reference module comprises a chip U1A, the third pin of the chip U1A is connected with a voltage dividing resistor R1 and a voltage dividing resistor R2, wherein the voltage dividing resistor R1 is connected with a DC12V end, the voltage dividing resistor R2 is grounded, and the voltage dividing resistor R2 is connected with a capacitor C1 in parallel, the second pin of the chip U1A is connected with a TTL end, the fourth pin of the chip U1A is connected with a DC12V end, the fourth pin of the chip U1A is grounded through a capacitor C3, the eleventh pin of the chip U1A is grounded, the first pin of the chip U1A is connected to the second pin of the chip U1A through a resistor R12 and a resistor R11 connected in series, and the first pin of the chip U1A is connected with the input end of the output module through a resistor R13.

[0011] Preferably, the operational amplifier circuit for realizing a linear adjustable power supply, the model number of the chip U1A is TLE2144IDW.

[0012] By the above scheme, the operational amplifier circuit for realizing a linear adjustable power supply has at least the following advantages:

[0013] The operational amplifier is adopted for linear control, complex digital control or a transformer is avoided, the radiation interference on the power supply and the introduced ripple are greatly reduced, and the operational amplifier circuit for realizing a linear adjustable power supply has good scalability, a higher output voltage range can be easily realized by improving a power supply voltage and reasonably adjusting a resistance ratio.

[0014] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application and the accompanying drawings as follows. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation on the scope, for those skilled in the art, without creative labor, other related drawings can also be obtained according to these drawings.

[0016] Figure 1 is the schematic diagram of the present application;

[0017] Figure 2 is the schematic diagram of the existing gain circuit of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in the following, combined with the drawings in the embodiments of the present application, obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0020] EMBODIMENT

[0021] As shown in Figure 1 and Figure 2 An operational amplifier circuit for realizing a linear adjustable power supply, comprising a reference module 1, a gain module 2 and an output module 3, the output end of the reference module 1 is connected with the input end of the output module 3, the output end of the gain module 2 is connected with the input end of the output module 3 through a diode D1;

[0022] The gain module 2 comprises a chip U1C, the eighth pin of the chip U1C is connected with the input end of the output module 3 through a diode D1, the eighth pin of the chip U1C is connected with one end of a resistor R9, the other end of the resistor R9 is connected with a resistor R7 and then grounded, the resistor R7 is connected with a capacitor C5 in parallel, a resistor R8 is connected with the ninth pin of the chip U1C, the resistor R8 is connected with the resistor R7, the resistor R8 is connected with a VCTRL end, the tenth pin of the chip U1C is connected with a DC12V end through a resistor R4, the tenth pin of the chip U1C is grounded through a resistor R5, and the resistor R5 is connected with the capacitor C4 in parallel;

[0023] The output module 3 comprises a chip U1B, the fifth pin of the chip U1B is connected with the output end of the reference module 1, the sixth pin of the chip U1B is grounded through a resistor R14, the sixth pin of the chip U1B is connected with the seventh pin of the chip U1B through a resistor R15, the seventh pin of the chip U1B is connected with the base of a triode Q1, the collector of the triode Q1 is connected with DC12V, the emitter of the triode Q1 is connected with the emitter of a triode Q2, the collector of the triode Q2 is connected with the base of the triode Q2 through a resistor R16 and is grounded at the same time, the base of the triode Q2 is connected with the anode of a diode ZD1, the cathode of the diode ZD1 is connected with the resistor R15 and the seventh pin of the chip U1B at the same time, the fifth pin of the chip U1B is connected with the anode of a diode D1, and the emitter of the triode Q1 is connected with an OUTPUT end.

[0024] The reference module 1 comprises a chip U1A, the third pin of the chip U1A is connected with a voltage dividing resistor R1 and a voltage dividing resistor R2, wherein the voltage dividing resistor R1 is connected with a DC12V end, the voltage dividing resistor R2 is grounded and is connected with a capacitor C1 in parallel, the second pin of the chip U1A is connected with a TTL end, the fourth pin of the chip U1A is connected with a DC12V end, the fourth pin of the chip U1A is grounded through a capacitor C3, the eleventh pin of the chip U1A is grounded, the first pin of the chip U1A is connected to the second pin of the chip U1A through a resistor R12 and a resistor R11 connected in series, and the first pin of the chip U1A is connected with the input end of the output module 3 through a resistor R13.

[0025] The model of the chip U1B and the chip U1C in the utility model is TLE2144IDW, and the chip model of the chip U1A is TLE2144IDW.

[0026] When the utility model works concretely,

[0027] The chip U1A in the reference module 1 is an operational amplifier working in a linear region, the resistors R1 and R2 are adjustable resistors and are used for setting a reference input, meanwhile, the chip U1A acts as a comparator and controls the start and stop of the subsequent chip U1B.

[0028] In the circuit in the gain module, as shown in Figure 2 the basic gain circuit,

[0029] The gain calculation formula is:

[0030]

[0031] Wherein,

[0032] m: amplification factor;

[0033] b: offset;

[0034] R3=R4=RIN;

[0035] ;

[0036] ;

[0037] The voltage gain can be improved by the above formula, and different voltage outputs can be achieved by adjusting the resistance.

[0038] And in the actual circuit,

[0039] Diode D1: stabilizes the input level of U1B.

[0040] Diode ZD1: provides circuit protection.

[0041] Triode Q2: responsible for fast discharge to enhance the circuit response ability.

[0042] Triode Q1: uses Darlington tube to enhance the output current capacity.

[0043] As shown in Figure 2 , if the input control voltage is a DC5V sine wave, the voltage is exactly inverted through the above-mentioned circuit, with a peak value of 9.5V and a valley value of 2.5V. At the same time, the dynamic response is fast: the input and output maintain 180° inversion, the dynamic response is almost without delay, which is superior to common DC-DC converters, and the linearity is good: the output waveform shows excellent linear response and no distortion.

[0044] It should be noted that similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present application, it should be noted that the terms "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] In addition, the terms "horizontal", "vertical", and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0047] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The above is only the preferred embodiment of the present application, and is not used to limit the present application, and it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection range of the present application.

Claims

1. An operational amplifier circuit for implementing a linearly adjustable power supply, characterized by: It comprises a reference module (1), a gain module (2) and an output module (3), the output end of the reference module (1) is connected with the input end of the output module (3), the output end of the gain module (2) is connected with the input end of the output module (3) through a diode D1; The gain module (2) comprises a chip U1C, the eighth pin of the chip U1C is connected with one end of a resistor R9, the other end of the resistor R9 is connected with a resistor R7 and then grounded, the resistor R7 is connected with a capacitor C5 in parallel, a resistor R8 is connected with the ninth pin of the chip U1C, the resistor R8 is connected with the resistor R7, the resistor R8 is connected with a VCTRL end, the tenth pin of the chip U1C is connected with a DC12V end through a resistor R4, the tenth pin of the chip U1C is grounded through a resistor R5, the resistor R5 is connected with the capacitor C4 in parallel. The output module (3) comprises a chip U1B, the fifth pin of the chip U1B is connected with the output end of the reference module (1), the sixth pin of the chip U1B is grounded through a resistor R14, the sixth pin of the chip U1B is connected with the seventh pin of the chip U1B through a resistor R15, the seventh pin of the chip U1B is connected with the base of a triode Q1, the collector of the triode Q1 is connected with a DC12V, the emitter of the triode Q1 is connected with the emitter of a triode Q2, the collector of the triode Q2 is connected with the base of the triode Q2 through a resistor R16 and is grounded at the same time, the base of the triode Q2 is connected with the anode of a diode ZD1, the cathode of the diode ZD1 is connected with the resistor R15 and the seventh pin of the chip U1B at the same time, the fifth pin of the chip U1B is connected with the anode of the diode D1, the emitter of the triode Q1 is connected with an OUTPUT end.

2. An operational amplifier circuit for implementing a linearly adjustable power supply according to claim 1, characterized in that: The model of the chip U1B and the chip U1C is TLE2144IDW.

3. The operational amplifier circuit for implementing a linear regulated power supply according to claim 1, wherein: The reference module (1) comprises a chip U1A, the third pin of the chip U1A is connected with a voltage dividing resistor R1 and a voltage dividing resistor R2, wherein the voltage dividing resistor R1 is connected with a DC12V end, the voltage dividing resistor R2 is grounded and a capacitor C1 is connected in parallel with the voltage dividing resistor R2, the second pin of the chip U1A is connected with a TTL end, the fourth pin of the chip U1A is connected with a DC12V end, the fourth pin of the chip U1A is grounded through a capacitor C3, the eleventh pin of the chip U1A is grounded, the first pin of the chip U1A is connected to the second pin of the chip U1A through a resistor R12 and a resistor R11 connected in series, the first pin of the chip U1A is connected with the input end of the output module (3) through a resistor R13.

4. An operational amplifier circuit for implementing a linearly adjustable power supply according to claim 3, characterized in that: The chip model of the chip U1A is TLE2144IDW.

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