Operational amplifier power supply circuit capable of reducing static power consumption

Abstract

The utility model discloses an operational amplifier power supply circuit capable of reducing static power consumption. The operational amplifier power supply circuit comprises an MOS tube, a first diode, a voltage stabilizing diode, a triode, a first resistor, a second resistor, a third resistor, a pre-driving chip and an operational amplifier chip, the circuit further comprises a second diode which is arranged at the rear end of the second resistor, the negative electrode of the second diode is connected with the other end of the second resistor, and the positive electrode of the second diode is connected with a pre-drive charge pump pin of the pre-drive chip and an operational amplifier power supply pin of the operational amplifier chip. According to the utility model, static power consumption is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of operational amplifier power supply circuit, especially to a kind of operational amplifier power supply circuit of reducing static power consumption. BACKGROUND

[0002] Referring to Figure 1 , the existing operational amplifier power supply circuit is shown in the figure, including MOS tube U1, diode D1, stabilizing diode D2, triode Q1, resistance R1, R2, R3, pre-drive chip U2 and operational amplifier chip U3.MOS tube U1's source S, one end of resistance R1, the negative pole of diode D1 and the positive pole of stabilizing diode D2 are connected and used as the positive pole end KL30+ of operational amplifier power supply circuit, the drain D of MOS tube U1 and the pre-drive power supply pin of pre-drive chip U2 are connected and used as the negative pole end KL30- of operational amplifier power supply circuit, the positive pole of diode D1 is connected with the emitter E of triode Q1, the base B of triode Q1 is connected with ground through resistance R3, the collector C of triode Q1 is connected with the gate G of MOS tube U1, the other end of resistance R1, the negative pole of stabilizing diode D2 and one end of resistance R2, the other end of resistance R2 is connected with CP network connection end and respectively connected with the pre-drive charge pump pin of pre-drive chip U2 and the operational amplifier power supply pin of operational amplifier chip U3.

[0003] Wherein, the loop formed by arrow 1 is that in the case of low power consumption, external power supply KL30+ passes through resistance to operational amplifier and pre-drive charge pump reverse flow, and leakage current is generated;The loop formed by arrow 2 is that the charge pump of pre-drive chip U2 is the power supply loop of operational amplifier chip U3;The loop formed by arrow 3 is that the charge pump of pre-drive chip U2 controls the working loop of anti-MOS tube U1.

[0004] When the controller is in sleep, voltage flows through resistance R1 through external power supply KL30+, and then flows through resistance R2 and then flows into pre-drive chip U2 and operational amplifier chip U3 through charge pump end respectively.The gate of pre-drive control MOS tube anti-circuit is provided by pre-drive chip U2, but pre-drive chip U2 will generate voltage reverse flow after the controller is in sleep, causing excessive static current. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide an operational amplifier power supply circuit for reducing static power consumption in view of the deficiencies of the prior art, to solve the problem of large static current of pre-drive MOS tube anti-reverse.

[0006] The technical problem to be solved by the utility model can be realized by adopting the following technical solutions:

[0007] An operational amplifier power supply circuit for reducing static power consumption, comprising a MOS transistor, a first diode, a stabilizing diode, a triode, a first resistor, a second resistor, a third resistor, a pre-driving chip and an operational amplifier chip; the source of the MOS transistor, one end of the first resistor, the negative electrode of the first diode and the positive electrode of the stabilizing diode are connected in parallel to serve as the positive electrode terminal of the operational amplifier power supply circuit, the drain of the MOS transistor and the pre-driving power supply pin of the pre-driving chip are connected in parallel to serve as the negative electrode terminal of the operational amplifier power supply circuit, the positive electrode of the first diode is connected with the emitter of the triode, the base of the triode is connected with the ground through the third resistor, the collector of the triode is connected with the gate of the MOS transistor, the other end of the first resistor, the negative electrode of the stabilizing diode and one end of the second resistor, the other end of the second resistor is connected with the pre-driving charge pump pin of the pre-driving chip and the operational amplifier power supply pin of the operational amplifier chip respectively; characterized in that further comprising:

[0008] a second diode, the second diode is arranged at the other end of the second resistor, the negative electrode of the second diode is connected with the other end of the second resistor, and the positive electrode of the second diode is connected with the pre-driving charge pump pin of the pre-driving chip and the operational amplifier power supply pin of the operational amplifier chip respectively.

[0009] In a preferred embodiment of the present application, the triode is an NPN triode.

[0010] Due to the adoption of the above technical scheme, the present application has the advantages that: by adding the diode with the reverse blocking function, the voltage cannot pass through the controller when it is in sleep mode, thereby effectively reducing the static power consumption. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0012] Figure 1 is a structural schematic diagram of the prior operational amplifier power supply circuit.

[0013] Figure 2 is a structural schematic diagram of the present application. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application will be further described below in combination with specific drawings.

[0015] Referring to Figure 2, the figure shows a kind of reducing static power consumption operational amplifier power supply circuit, including MOS transistor U10, diode D10, D20, zener diode D30, triode Q10, resistance R10, R20, R20, pre-drive chip U20 and operational amplifier chip U30.In the embodiment, triode Q10 preferably uses NPN triode.

[0016] The source S of MOS transistor U10, one end of resistance R10, the negative pole of diode D10 and the positive pole of zener diode D30 are connected and used as the positive pole end KL30+ of operational amplifier power supply circuit, the drain D of MOS transistor U10 and the pre-drive power supply pin of pre-drive chip U20 are connected and used as the negative pole end of operational amplifier power supply circuit, the positive pole of diode D10 is connected with the emitter E of triode Q10, the base B of triode Q10 is connected with ground through resistance R30, the collector C of triode Q10 is connected with the gate S of MOS transistor U10, the other end of resistance R10, the negative pole of zener diode D30 and one end of resistance R20, the other end of resistance R20 is connected with the negative pole of diode D20, and the positive pole of diode D20 is connected with the pre-drive charge pump pin of pre-drive chip U20 and the operational amplifier power supply pin of operational amplifier chip U30 as CP network connection end.

[0017] KL30 is connector and is connected with the power supply of operational amplifier power supply circuit, provides working voltage for operational amplifier power supply circuit, and CP network connection end is the charge pump of pre-drive. Figure 2 The loop formed by the arrow in the figure is the operational amplifier power supply loop in normal working state.The voltage is passed through connector KL30 to resistance R10 and then to R20 when the controller is in sleep state, but the voltage cannot pass through because diode D20 is reverse blocking diode, at this time, the voltage of CP network connection end is 0V, and the operational amplifier power supply is 0V, effectively reducing static power consumption.

[0018] The basic principle and main features of the present application and the advantages of the present application are shown and described above.The skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An operational amplifier power supply circuit for reducing static power consumption, comprising a MOSFET, a first diode, a Zener diode, a transistor, first, second, and third resistors, a pre-driver chip, and an operational amplifier chip; wherein the source of the MOSFET, one end of the first resistor, the cathode of the first diode, and the anode of the Zener diode are connected in parallel to form the positive terminal of the operational amplifier power supply circuit; the drain of the MOSFET is connected in parallel to the pre-driver power supply pin of the pre-driver chip to form the negative terminal of the operational amplifier power supply circuit; the anode of the first diode is connected to the emitter of the transistor; the base of the transistor is grounded through the third resistor; the collector of the transistor is connected in parallel to the gate of the MOSFET, the other end of the first resistor, the cathode of the Zener diode, and one end of the second resistor; the other end of the second resistor is connected to the pre-driver charge pump pin of the pre-driver chip and the operational amplifier power supply pin of the operational amplifier chip, respectively; characterized in that... Also includes: The second diode is located at the rear end of the second resistor, with its negative terminal connected to the other end of the second resistor and its positive terminal connected to the pre-drive charge pump pin of the pre-drive chip and the operational amplifier power supply pin of the operational amplifier chip, respectively.

2. The operational amplifier power supply circuit for reducing static power consumption as described in claim 1, characterized in that, The transistor is an NPN type transistor.

Images