Power supply monitoring circuit

Abstract

The invention provides a power supply monitoring circuit, and relates to the technical field of monitoring circuits, and the circuit comprises a first group of voltage dividing resistors R1 and R2, a second group of voltage dividing resistors R3 and R4, a protection resistor R5, an output resistor R6, precise adjustable voltage reference source chips U1 and U2, and a photoelectric coupler U3 which converts and outputs a digital signal to a post-stage circuit. The monitoring circuit is composed of a resistor, a precise adjustable voltage reference source chip and a photoelectric coupler. According to the power supply monitoring circuit, voltage in different ranges is monitored by setting the resistance value of a resistor, and different digital signals are output for different voltage states.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring circuits, and in particular provides a power supply monitoring circuit. Background Art

[0002] In avionics equipment, it is necessary to monitor the supply voltages of various voltage values ​​and transmit them to other circuits via digital signals.

[0003] Currently, the existing power supply monitoring circuit is mainly implemented by an operational amplifier circuit or an AD acquisition circuit.

[0004] The operational amplifier circuit requires power supply for the operational amplifier, which takes up a large amount of circuit board space and requires the design of additional power supply traces;

[0005] Although the AD acquisition circuit has high acquisition accuracy, the cost is also high, and other circuits are required to process the collected data, and the circuit complexity is high. Summary of the invention

[0006] The purpose of this application is to solve the drawbacks of the power supply monitoring circuit in the prior art and improve the functional performance of the power supply monitoring circuit.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a power supply monitoring circuit, the circuit includes a first group of voltage-squeezing resistors R1 and R2, a second group of voltage-squeezing resistors R3 and R4, a protection resistor R5 and an output resistor R6, a precision adjustable voltage reference source chip U1, U2, and a photoelectric coupler U3 for converting and outputting digital signals to a subsequent circuit,

[0008] One end of resistor R1 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal; one end of resistor R2 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal ground; one end of resistor R3 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal; one end of resistor R4 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal ground; the cathode of chip U1 is connected to the reference end of chip U2; one end of resistor R5 is connected to the cathode of chip U2, and the other end is connected to the monitored power signal; the anodes of chip U1 and chip U2 are connected to the monitored power signal ground; one end of resistor R6 is connected to the anode of chip U3, and the other end is connected to the monitored power signal; the cathode of chip U3 is the anode and cathode of chip U2.

[0009] The power supply monitoring circuit provided by the present invention also has the following technical features:

[0010]

[0011] Among them, U L is the minimum value of the voltage to be monitored, U His the maximum value of the voltage to be monitored.

[0012] Beneficial Effects

[0013] Compared with a power monitoring circuit implemented by an operational amplifier circuit, the power monitoring circuit provided by the present invention uses a precision adjustable voltage reference source device that does not require a dedicated power supply line and occupies less circuit board space.

[0014] Compared with the power supply monitoring circuit implemented by the AD acquisition circuit, the power supply monitoring circuit provided by the present invention uses a lower-priced precision adjustable voltage reference source device, so the cost of the entire power supply monitoring circuit is also lower; the code value signal output by the AD acquisition circuit requires further processing by a digital integrated circuit such as a CPU before it can be used, while the power supply monitoring circuit provided by the present invention directly outputs high and low level digital signals, which can be directly acquired and used, so the complexity of the entire product is also lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of a switching circuit provided by the present invention. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0018] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0019] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0020] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0021] like Figure 1 As shown, the embodiment of the present application provides a power supply monitoring circuit, the circuit includes a first group of voltage-squeezing resistors R1 and R2, a second group of voltage-squeezing resistors R3 and R4, a protection resistor R5 and an output resistor R6, a precision adjustable voltage reference source chip U1, U2, and a photoelectric coupler U3 for converting and outputting digital signals to a subsequent circuit.

[0022] One end of resistor R1 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal; one end of resistor R2 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal ground; one end of resistor R3 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal; one end of resistor R4 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal ground; the cathode of chip U1 is connected to the reference end of chip U2; one end of resistor R5 is connected to the cathode of chip U2, and the other end is connected to the monitored power signal; the anodes of chip U1 and chip U2 are connected to the monitored power signal ground; one end of resistor R6 is connected to the anode of chip U3, and the other end is connected to the monitored power signal; the cathode of chip U3 is the anode and cathode of chip U2.

[0023] In some embodiments, in the circuit:

[0024]

[0025]

[0026] Among them, U L is the minimum value of the voltage to be monitored, U H is the maximum value of the voltage to be monitored.

[0027] In some embodiments, for a certain voltage range U H ~U L , when the input voltage is greater than U HWhen the input voltage is at U H ~U L When the input voltage is less than U L When , the optocoupler U3 is not conducting.

[0028] In some embodiments, when the input voltage is at U H ~U L When the input voltage is between U H ~U L When the photocoupler U3 is between 0 and 1, the photocoupler U3 outputs a low level to the subsequent circuit, thereby achieving the function of voltage monitoring.

[0029] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A power supply monitoring circuit, characterized in that: The circuit includes a first group of voltage-squeezing resistors R1 and R2, a second group of voltage-squeezing resistors R3 and R4, a protection resistor R5 and an output resistor R6, precision adjustable voltage reference source chips U1 and U2, and a photoelectric coupler U3 for converting and outputting digital signals to a subsequent circuit. One end of resistor R1 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal; one end of resistor R2 is connected to the reference end of chip U1, and the other end is connected to the monitored power signal ground; one end of resistor R3 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal; one end of resistor R4 is connected to the cathode of chip U1, and the other end is connected to the monitored power signal ground; the cathode of chip U1 is connected to the reference end of chip U2; one end of resistor R5 is connected to the cathode of chip U2, and the other end is connected to the monitored power signal; the anodes of chip U1 and chip U2 are connected to the monitored power signal ground; one end of resistor R6 is connected to the anode of chip U3, and the other end is connected to the monitored power signal; the cathode of chip U3 is the anode and cathode of chip U2.

2. The power supply monitoring circuit according to claim 1, characterized in that: In the circuit: Among them, U L is the minimum value of the voltage to be monitored, U H is the maximum value of the voltage to be monitored.

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