Power supply monitoring circuit and electronic equipment

Abstract

The utility model relates to a power supply monitoring circuit and electronic equipment, belongs to the technical field of power supply monitoring, and is used for monitoring power supply voltage in real time. The power supply monitoring circuit comprises a photoelectric coupler, a resistor R4, a first voltage stabilizing source, a second voltage stabilizing source, a first voltage dividing unit and a second voltage dividing unit, and a tested power supply is connected with the reference end of the first voltage stabilizing source and the reference end of the second voltage stabilizing source through the first voltage dividing unit and the second voltage dividing unit respectively. The cathode of the first voltage stabilizing source is connected with the reference end of the second voltage stabilizing source; the input positive end and the input negative end of the photoelectric coupler are respectively connected with the output end of the tested power supply and the cathode of the second voltage stabilizing source; the resistor R4 is connected in parallel between the input positive end and the input negative end of the photoelectric coupler, and the output end of the photoelectric coupler is connected with a reference voltage and outputs a monitoring signal. According to the utility model, when the power supply voltage is lower than a normal power supply range, the monitoring signal generates an overturning level, and real-time monitoring of the power supply voltage is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply monitoring, in particular to a power supply monitoring circuit and electronic equipment. Background Art

[0002] With the vigorous development of the domestic aviation industry, aircraft have entered the all-electric era, and the use of airborne electronic equipment has become more and more widespread. The common standard for aircraft to power onboard electronic equipment is GJB151B, and the normal power supply range is 18V to 32V. When the power supply voltage is within the normal power supply range, the airborne electronic equipment can work normally. When the equipment is abnormal and the power supply voltage is lower than the normal power supply range, the normal operation of the airborne electronic equipment cannot be guaranteed, and it may even cause damage to the electronic equipment. Therefore, it is necessary to monitor the power supply voltage in real time so that when the power supply voltage is lower than the normal power supply range, the processor of the electronic equipment can be notified in time to enter the power-off procedure. Utility Model Content

[0003] In view of the above analysis, the utility model aims to provide a power supply monitoring circuit and electronic device for real-time monitoring of the power supply voltage, so as to promptly notify the processor of the electronic device to enter the power-off procedure when the power supply voltage is lower than the normal power supply range.

[0004] The purpose of this utility model is mainly achieved through the following technical solutions:

[0005] The utility model provides a power supply monitoring circuit, which comprises: a photoelectric coupler, a resistor R4, a first voltage-stabilizing source, a second voltage-stabilizing source, a first voltage-dividing unit and a second voltage-dividing unit.

[0006] The first stabilized voltage source and the second stabilized voltage source are both stabilized voltage sources with voltage comparators; wherein the output voltage of the first stabilized voltage source is greater than the on-state voltage of the second stabilized voltage source;

[0007] The output end of the power supply under test is connected to the reference end of the first voltage-stabilizing source through the first voltage-dividing unit, the output end of the power supply under test is connected to the reference end of the second voltage-stabilizing source through the second voltage-dividing unit, the cathode of the first voltage-stabilizing source is connected to the reference end of the second voltage-stabilizing source, and the anode of the first voltage-stabilizing source is grounded; the cathode of the second voltage-stabilizing source is connected to the negative input end of the photoelectric coupler, and the anode of the second voltage-stabilizing source is grounded;

[0008] The output end of the power supply under test is connected to the positive input end of the photoelectric coupler, the resistor R4 is connected in parallel between the positive input end and the negative input end of the photoelectric coupler, the output end of the photoelectric coupler is connected to the reference voltage, and the output end of the photoelectric coupler outputs the monitoring signal of the power supply under test.

[0009] Based on the further improvement of the above solution, the first voltage dividing unit includes a resistor R1A and a resistor R2A.

[0010] The resistor R1A and the resistor R2A are connected in series between the output terminal of the power supply under test and the ground terminal, and the reference terminal of the first voltage stabilizing source is connected between the resistor R1A and the resistor R2A.

[0011] Based on the further improvement of the above solution, the second voltage dividing unit includes a resistor R1B and a resistor R2B.

[0012] The resistor R1B and the resistor R2B are connected in series between the output terminal of the power supply under test and the ground terminal, and the cathode of the first stabilized voltage source and the reference terminal of the second stabilized voltage source are both connected between the resistor R1B and the resistor R2B.

[0013] Based on the further improvement of the above solution, the first voltage stabilizing source and the second voltage stabilizing source are both voltage reference chips of model TL431.

[0014] Based on the further improvement of the above solution, the power monitoring circuit further includes: a resistor R3,

[0015] The resistor R3 is connected between the output end of the power supply under test and the positive input end of the photoelectric coupler.

[0016] Based on the further improvement of the above solution, the light emitter of the photoelectric coupler is a light emitting diode, and the light receiver of the photoelectric coupler is a photo transistor.

[0017] Based on a further improvement of the above solution, the reference voltage is a high level signal.

[0018] The utility model also provides an electronic device, which comprises: the power supply monitoring circuit as described above, wherein the power supply monitoring circuit is used to monitor the voltage of the power supply of the electronic device.

[0019] Based on the further improvement of the above scheme, the electronic device also includes: a processor and a memory, the output end of the photoelectric coupler is connected to the processor of the electronic device to send the monitoring signal to the processor, the processor is connected to the storage, and the processor sends the device information of the electronic device to the memory according to the received monitoring signal.

[0020] Based on a further improvement of the above solution, a buffer driver is connected between the output end of the photoelectric coupler and the processor, and the buffer driver is used to adjust the voltage of the monitoring signal to the operating voltage of the processor.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] 1. In the utility model, the function of hysteresis comparison is realized by two voltage regulators with voltage comparators, a photocoupler and a resistor R4 connected in parallel with the photocoupler. When the power supply voltage is lower than the normal power supply range, the monitoring signal generates a flip level, thereby realizing real-time monitoring of the power supply voltage, so as to promptly notify the processor of the electronic device to enter the power-off procedure when the power supply voltage is lower than the normal power supply range, thereby avoiding damage to the electronic device caused by too low power supply voltage.

[0023] 2. In the present invention, a photoelectric coupler is used to isolate the power monitoring circuit from other circuits of the electronic device.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0026] Figure 1 A schematic diagram of the structure of a power supply monitoring circuit according to an embodiment of the present utility model;

[0027] Figure 2 The figure is a schematic structural diagram of an electronic device according to an embodiment of the present utility model.

[0028] Reference numerals:

[0029] 1-photocoupler; 2-first voltage regulator; 3-second voltage regulator. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] An embodiment of the utility model discloses a power supply monitoring circuit, such as Figure 1 shown.

[0032] The power supply monitoring circuit includes: a photoelectric coupler, a resistor R4, a first voltage-stabilizing source, a second voltage-stabilizing source, a first voltage-dividing unit and a second voltage-dividing unit, wherein the first voltage-stabilizing source and the second voltage-stabilizing source are both voltage-stabilizing sources with a voltage comparator; wherein the output voltage of the first voltage-stabilizing source is greater than the on-voltage of the second voltage-stabilizing source; the output end of the power supply under test is connected to the reference end of the first voltage-stabilizing source through the first voltage-dividing unit, the output end of the power supply under test is connected to the reference end of the second voltage-stabilizing source through the second voltage-dividing unit, the cathode of the first voltage-stabilizing source is connected to the reference end of the second voltage-stabilizing source, and the anode of the first voltage-stabilizing source is grounded; the cathode of the second voltage-stabilizing source is connected to the negative input end of the photoelectric coupler, and the anode of the second voltage-stabilizing source is grounded; the output end of the power supply under test is connected to the positive input end of the photoelectric coupler, the resistor R4 is connected in parallel between the positive input end and the negative input end of the photoelectric coupler, the output end of the photoelectric coupler is connected to the reference voltage, and the output end of the photoelectric coupler outputs the monitoring signal of the power supply under test.

[0033] Compared with the prior art, the utility model realizes the function of hysteresis comparison through two voltage regulators with voltage comparators, a photocoupler and a resistor R4 connected in parallel with the photocoupler. When the power supply voltage is lower than the normal power supply range, the monitoring signal generates a flip level, thereby realizing real-time monitoring of the power supply voltage, so as to timely notify the processor of the electronic device to enter the power-off procedure when the power supply voltage is lower than the normal power supply range, and avoid damage to the electronic device caused by too low power supply voltage. Specifically, when the voltage of the power supply under test is within the normal power supply range, the first voltage regulator works, and the second voltage regulator does not work, so that the photocoupler is not turned on, and the reference voltage is output as the monitoring signal; when the voltage of the power supply under test is lower than the normal power supply range, the first voltage regulator does not work, and the second voltage regulator works, so that the photocoupler is turned on, and the reference voltage is pulled down and output as the monitoring signal.

[0034] The photoelectric coupler is an electrical-optical-electrical conversion device that uses light as a medium to transmit electrical signals, and has a good isolation effect on input and output electrical signals. In the utility model, the photoelectric coupler is used to isolate the power monitoring circuit from other circuits of the electronic device.

[0035] Specifically, the light emitter of the photoelectric coupler is a light emitting diode, and the light receiver of the photoelectric coupler is a photo transistor.

[0036] It should be noted that the voltage regulator with a voltage comparator has three terminals: a reference terminal, an anode and a cathode, wherein the reference terminal is used for input voltage, and the anode and the cathode are used for output voltage. When the input voltage of the reference terminal is greater than or equal to a preset turn-on voltage, the anode and the cathode of the voltage regulator are turned on and a stable voltage is output; when the input voltage of the reference terminal is less than the turn-on voltage, the anode and the cathode of the voltage regulator are not turned on.

[0037] During implementation, when the voltage of the power supply under test is within the normal power supply range, that is, when the voltage of the power supply under test is greater than or equal to the preset value, the voltage output by the first voltage divider unit is greater than or equal to the turn-on voltage of the first voltage stabilizer, the cathode and anode of the first voltage stabilizer are turned on, and the first voltage stabilizer outputs a voltage. At this time, the input voltage of the reference end of the second voltage stabilizer is the output voltage of the first voltage stabilizer. Since the output voltage of the first voltage stabilizer is less than the turn-on voltage of the second voltage stabilizer, the cathode and anode of the second voltage stabilizer are not turned on, and the resistor R4 is suspended, so that there is no voltage drop between the positive input terminal and the negative input terminal of the optocoupler, the light-emitting body of the optocoupler is not turned on, and then the photoreceptor of the optocoupler is not turned on, the output end of the optocoupler is in a suspended state, and the reference voltage is output as a monitoring signal.

[0038] When the voltage of the power supply under test is lower than the normal power supply range, that is, when the voltage of the power supply under test is less than the preset value, the voltage output by the first voltage divider unit is less than the turn-on voltage of the first voltage stabilizer, and there is no conduction between the cathode and the anode of the first voltage stabilizer. At this time, the input voltage of the reference end of the second voltage stabilizer is the voltage output by the second voltage divider unit. Since the voltage of the second power supply is greater than the turn-on voltage of the second voltage stabilizer at this time, the cathode and anode of the second voltage stabilizer are turned on, and the voltage of the cathode of the light-emitting body of the optocoupler is the output voltage of the second voltage stabilizer, thereby generating a voltage drop between the input positive terminal and the input negative terminal of the optocoupler, the light-emitting body of the optocoupler is turned on, and then the photoreceptor of the optocoupler is turned on, and the reference voltage is pulled down and output as a monitoring signal.

[0039] Specifically, the reference voltage is a high level signal. When the voltage of the power supply under test is lower than the normal power supply range, the photoreceptor of the photocoupler is turned on, the reference voltage is pulled down, and the monitoring signal is flipped from a high level to a low level.

[0040] Specifically, the first voltage stabilizing source and the second voltage stabilizing source are both voltage reference chips of model TL431.

[0041] At the same time, in the utility model, the first voltage dividing unit and the second voltage dividing unit are respectively used to divide the voltage of the power supply under test, so that the voltage of the power supply under test is reduced according to corresponding proportions, respectively meeting the input voltage requirements of the first voltage stabilizing source and the second voltage stabilizing source, thereby controlling the working state (whether it is turned on) of the first voltage stabilizing source and the second voltage stabilizing source.

[0042] Specifically, the first voltage dividing unit includes a resistor R1A and a resistor R2A, wherein the resistor R1A and the resistor R2A are connected in series between the output terminal of the power supply under test and the ground terminal, and the reference terminal of the first voltage stabilizing source is connected between the resistor R1A and the resistor R2A. The resistor R1A and the resistor R2A are used to divide the voltage of the power supply under test.

[0043] Specifically, the second voltage-dividing unit includes a resistor R1B and a resistor R2B, wherein the resistor R1B and the resistor R2B are connected in series between the output terminal of the power supply under test and the ground terminal, and the cathode of the first voltage-stabilizing source and the reference terminal of the second voltage-stabilizing source are both connected between the resistor R1B and the resistor R2B. The resistor R1B and the resistor R2B are used to divide the voltage of the power supply under test.

[0044] Specifically, the power monitoring circuit further includes: a resistor R3, which is connected between the output end of the power supply under test and the anode of the photoreceptor. The resistor R3 is used to reduce the voltage of the positive input end of the photocoupler to meet the turn-on voltage requirement of the photoreceptor of the photocoupler.

[0045] An embodiment of the present invention further provides an electronic device, the electronic device comprising: the power monitoring circuit as described above, the power monitoring circuit being used to monitor the voltage of the power supply of the electronic device.

[0046] Specifically, Figure 2 As shown in , the electronic device also includes: a processor and a memory, the output end of the photoelectric coupler is connected to the processor of the electronic device, the processor is connected to the storage, and the processor sends the device information of the electronic device to the memory according to the monitoring signal output by the photoelectric coupler.

[0047] During implementation, when the power supply voltage of the electronic device is lower than the normal power supply range, the monitoring signal of the power monitoring circuit is flipped to form an interrupt signal. After receiving the interrupt signal, the processor enters the interrupt service program, writes the device parameters that need to be saved to the memory, and then waits for power off. When the power is on next time, the device parameters stored in the memory are read to help the operator determine the device abnormality and the reason for the power off.

[0048] More specifically, the memory is a non-volatile memory.

[0049] The device information includes a power-off flag. After the computer is powered on again, the software reads the power-off flag previously written into the non-volatile memory to determine the execution branch of the subsequent program. In addition, the device information may also include the coordinate value, speed, attitude and other information of the aircraft at the current moment.

[0050] Specifically, a buffer driver is connected between the output end of the photocoupler and the processor, and the buffer driver is used to adjust the voltage of the monitoring signal to the operating voltage of the processor. For example, if the IO level of the processor is 3.3V and the voltage of the monitoring signal is 5V, the monitoring signal can be converted to 3.3V by the buffer driver and then sent to the processor.

[0051] Example 1

[0052] In this embodiment, Figure 1 As shown in , the power supply monitoring circuit includes: a photocoupler, a resistor R3, a resistor R4, a resistor R1A, a resistor R2A, a resistor R1B, a resistor R2B, a first voltage stabilizer and a second voltage stabilizer. Among them, the resistor R1A is 12k / F, the resistor R2A is 2k / F, the resistor R1B is 12k / F, the resistor R2B is 12k / F, the resistor R3 is 300 / F, and the resistor R4 is 12k / F. The first voltage stabilizer and the second voltage stabilizer are both TL431 chips. When the voltage input to the reference end of the first voltage stabilizer is greater than or equal to 2.5V, its anode and cathode are turned on and a 2V voltage is output; when the voltage input to the reference end of the second voltage stabilizer is greater than or equal to 2.5V, its anode and cathode are turned on and a 2V voltage is output.

[0053] The rated voltage of the power supply under test is 28V, and the positive power supply range is 18V to 32V. According to experience, when the voltage of the power supply under test is lower than 17.4V, it is considered to be lower than the normal power supply range. When the voltage of the power supply under test is greater than or equal to 17.4V, the first voltage stabilizer works, the second voltage stabilizer does not work, the photocoupler does not conduct, and the reference voltage is output as a monitoring signal; when the voltage of the power supply under test is lower than 17.4V, the first voltage stabilizer does not work, the second voltage stabilizer works, the photocoupler conducts, and the reference voltage is pulled down and output as a monitoring signal.

[0054] The utility model only needs to connect the devices with corresponding functions through the connection relationship given in the embodiment of the utility model, which does not involve any improvement in program software. As for the connection mode between the hardware devices with corresponding functions, those skilled in the art can use the existing technology to achieve, and no detailed description is given here.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply monitoring circuit, characterized in that: The power supply monitoring circuit includes: a photocoupler, a resistor R4, a first voltage stabilizing source, a second voltage stabilizing source, a first voltage dividing unit and a second voltage dividing unit. The first stabilized voltage source and the second stabilized voltage source are both stabilized voltage sources with voltage comparators; wherein the output voltage of the first stabilized voltage source is greater than the on-state voltage of the second stabilized voltage source; The output end of the power supply under test is connected to the reference end of the first voltage-stabilizing source through the first voltage-dividing unit, the output end of the power supply under test is connected to the reference end of the second voltage-stabilizing source through the second voltage-dividing unit, the cathode of the first voltage-stabilizing source is connected to the reference end of the second voltage-stabilizing source, and the anode of the first voltage-stabilizing source is grounded; the cathode of the second voltage-stabilizing source is connected to the negative input end of the photoelectric coupler, and the anode of the second voltage-stabilizing source is grounded; The output end of the power supply under test is connected to the positive input end of the photoelectric coupler, the resistor R4 is connected in parallel between the positive input end and the negative input end of the photoelectric coupler, the output end of the photoelectric coupler is connected to the reference voltage, and the output end of the photoelectric coupler outputs the monitoring signal of the power supply under test.

2. The power supply monitoring circuit according to claim 1, characterized in that: The first voltage dividing unit includes a resistor R1A and a resistor R2A. The resistor R1A and the resistor R2A are connected in series between the output terminal of the power supply under test and the ground terminal, and the reference terminal of the first voltage stabilizing source is connected between the resistor R1A and the resistor R2A.

3. The power monitoring circuit according to claim 2, characterized in that: The second voltage dividing unit includes a resistor R1B and a resistor R2B. The resistor R1B and the resistor R2B are connected in series between the output terminal of the power supply under test and the ground terminal, and the cathode of the first stabilized voltage source and the reference terminal of the second stabilized voltage source are both connected between the resistor R1B and the resistor R2B.

4. The power supply monitoring circuit according to any one of claims 1 to 3, characterized in that: The first voltage stabilizing source and the second voltage stabilizing source are both voltage reference chips of model TL431.

5. The power supply monitoring circuit according to any one of claims 1 to 3, characterized in that: The power supply monitoring circuit further includes: a resistor R3, The resistor R3 is connected between the output end of the power supply under test and the positive input end of the photoelectric coupler.

6. The power supply monitoring circuit according to any one of claims 1 to 3, characterized in that: The light emitter of the photoelectric coupler is a light emitting diode, and the light receiver of the photoelectric coupler is a photo transistor.

7. The power supply monitoring circuit according to any one of claims 1 to 3, characterized in that: The reference voltage is a high level signal.

8. An electronic device, characterized in that: The electronic device comprises: the power monitoring circuit according to any one of claims 1 to 7, wherein the power monitoring circuit is used to monitor the voltage of the power supply of the electronic device.

9. The electronic device according to claim 8, characterized in that: The electronic device further comprises: a processor and a memory, The output end of the photoelectric coupler is connected to the processor of the electronic device to send the monitoring signal to the processor. The processor is connected to the storage, and the processor sends the device information of the electronic device to the storage according to receiving the monitoring signal.

10. The electronic device according to claim 9, characterized in that: A buffer driver is connected between the output end of the photoelectric coupler and the processor. The buffer driver is used to adjust the voltage of the monitoring signal to the operating voltage of the processor.

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