CN212060420U - Low-voltage servo power-down detection circuit - Google Patents
Low-voltage servo power-down detection circuit Download PDFInfo
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- CN212060420U CN212060420U CN201922267865.5U CN201922267865U CN212060420U CN 212060420 U CN212060420 U CN 212060420U CN 201922267865 U CN201922267865 U CN 201922267865U CN 212060420 U CN212060420 U CN 212060420U
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Abstract
The utility model provides a servo power failure detection circuit of low pressure, including waiting to detect power and switch circuit, switch circuit includes on-off control input side and on-off control controlled side, on-off control input side connect in wait to detect the power in order to wait to detect the power normal time switch circuit that switches on of power, turn-off switch circuit when waiting to detect the power disconnection, the both ends of on-off control controlled side are one end respectively and are connected in the power end, and the other end passes through pull-down resistance and connects in the earthing terminal, just pull-down resistance keeps away from the one end of earthing terminal and connects in order to export the high level to the MCU chip when switch circuit switches on to the MCU chip, exports the low level. The utility model can be suitable for the power failure detection of the low-voltage servo power supply for DC power supply, and has the advantages of simple circuit structure, low cost and the like; is as follows.
Description
Technical Field
The utility model belongs to the technical field of the power failure detection, especially, relate to a servo power failure detection circuit of low pressure.
Background
At present, a power failure detection circuit for alternating current exists, for example, a power failure detection circuit shown in fig. 1, but at present, a demand for a low-voltage servo is increasing, and a power supply of the low-voltage servo is direct current, and the power failure detection circuit for alternating current shown in fig. 1 is not suitable for power failure detection of direct current.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, a low pressure servo power down detection circuitry is provided.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model provides a servo power failure detection circuit of low pressure, is including waiting to detect power and switch circuit, switch circuit includes on-off control input side and on-off control controlled side, on-off control input side connect in wait to detect the power in order to wait to detect the switch circuit of switching on when the power is normal, wait to detect the switching off circuit of switching off when power, the both ends of on-off control controlled side are one end respectively and are connected in the power end, and the other end passes through pull-down resistor and connects in the earthing terminal, just the one end that pull-down resistor kept away from the earthing terminal is connected in order to export the high level to the MCU chip when switch circuit switches on to the MCU.
In the aforementioned low-voltage servo power-down detection circuit, the switching circuit includes a first triode and a second triode, a base of the first triode is a switching control input side, which is connected to the power supply to be detected, a controlled side of the first triode is connected to a base of the second triode to drive the second triode when the first triode is turned on, and the controlled side of the second triode is the switching control controlled side.
In the low-voltage servo power-down detection circuit, the first triode is an NPN triode, the controlled side of the first triode comprises a collector and an emitter, the collector of the first triode is connected to a power supply end through a pull-up resistor, the emitter is connected to a ground end, and the base of the second triode is connected to one end of the pull-up resistor, which is far away from the power supply end.
In the low-voltage servo power failure detection circuit, the second triode is a PNP triode, the controlled side of the second triode comprises a collector and an emitter, the emitter of the second triode is connected to a power supply end, the collector is connected to a ground terminal through a pull-down resistor, and the MCU chip is connected to the common end of the pull-down resistor and the collector.
In the low-voltage servo power failure detection circuit, the MCU chip is any DSP processor with a GPIO interface.
In the low-voltage servo power failure detection circuit, the power supply end is a 3.3V direct-current power supply.
In the low-voltage servo power failure detection circuit, the switch circuit further comprises a power failure detection time adjusting circuit.
In the low-voltage servo power-down detection circuit, the power-down time adjusting circuit comprises a divider resistor connected in series between a collector of the first triode and a pull-up resistor, an adjustable resistor is connected in series between a base of the first triode and a power source to be detected, an adjusting end of the adjustable resistor is connected to the base of the first triode, and two ends of the adjustable resistor are respectively connected to the power source to be detected and an emitter of the first triode.
In the low-voltage servo power-down detection circuit, the power-down detection time adjusting circuit further comprises a voltage stabilizing circuit connected in series between the adjustable resistor and the power supply to be detected.
In the low-voltage servo power-down detection circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode, the cathode of the voltage stabilizing diode is connected to the power supply to be detected, and the anode of the voltage stabilizing diode is connected to the adjustable resistor.
The utility model has the advantages that the power failure detection device can be suitable for low-voltage servo power supply power failure detection for direct current power supply, and has the advantages of simple circuit structure, low cost and the like; the time of power failure detection can be adjusted through the adjustable resistor and the voltage stabilizing diode, and the requirements of different power failure detection time on more occasions are met.
Drawings
FIG. 1 is a prior art power down detection circuit for AC power down detection;
fig. 2 is the utility model is used for the servo power down detection circuit of direct current low pressure.
Reference numerals: a first transistor Q1; a second transistor Q2; pull-up resistor R1; a pull-down resistor R3; a voltage dividing resistor R2; an adjustable resistor R4; a zener diode D1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, this embodiment discloses a low-voltage servo power-down detection circuit, including waiting to detect power and switch circuit, this is exemplified by the waiting to detect power of 24V, the switch circuit includes a switch control input side and a switch control controlled side, the switch control input side is connected to the waiting to detect power to turn on the switch control controlled side of the switch circuit when the waiting to detect power is normal, the switch control controlled side of the switch circuit is turned off when the waiting to detect power is off, one end of each of two ends of the switch control controlled side is connected to a power supply end, the power supply end is a 3.3V dc power supply, the other end is connected to a ground end through a pull-down resistor R3, and one end of the pull-down resistor R3, which is far away from the ground end, is connected to the MCU chip to output a high level when. The MCU chip can be any DSP processor with GPIO interface.
Specifically, the switching circuit includes a first transistor Q1 and a second transistor Q2, the base of the first transistor Q1 is the switching control input side, which is connected to the power source to be tested, the controlled side of the first transistor Q1 is connected to the base of the second transistor Q2 to drive the second transistor Q2 when the first transistor Q1 is turned on, and the controlled side of the second transistor Q2 is the switching control controlled side.
The first triode Q1 is an NPN triode, the controlled side of the first triode Q1 includes a collector and an emitter, the collector of the first triode Q1 is connected to the power supply terminal through a pull-up resistor R1, the emitter is connected to the ground terminal, and the base of the second triode Q2 is connected to one end of the pull-up resistor R1 away from the power supply terminal; the second triode Q2 is a PNP triode, the controlled side of the second triode Q2 also comprises a collector and an emitter, the emitter of the second triode Q2 is connected to the power supply end, the collector is connected to the ground end through a pull-down resistor R3, and the MCU chip is connected to the common end of the pull-down resistor R3 and the collector.
Preferably, the switching circuit further comprises a power-down detection time adjusting circuit.
Specifically, the power-down time adjusting circuit comprises a divider resistor R2 connected in series between a collector of a first triode Q1 and a pull-up resistor R1, an adjustable resistor R4 is connected in series between a base of the first triode Q1 and a power source to be detected, an adjusting end of the adjustable resistor R4 is connected to a base of the first triode Q1, and two ends of the adjustable resistor R4 are respectively connected to the power source to be detected and an emitter of the first triode Q1.
Further, the power failure detection time adjusting circuit further comprises a voltage stabilizing circuit connected between the adjustable resistor R4 and the power source to be detected in series. The voltage stabilizing circuit is a voltage stabilizing diode D1, the cathode of the voltage stabilizing diode D1 is connected to the power supply to be detected, and the anode is connected to the adjustable resistor R4.
In the power failure detection circuit of the embodiment, when the power supply to be detected is normal, the voltage drop between AB in fig. 2 causes the first triode Q1 to be opened, and simultaneously, the second triode Q2 is also opened, and at this time, the corresponding port of the MCU chip receives the signal "1"; when the 24V power supply to be detected is disconnected, the 24V voltage is reduced, so that the voltage drop between the AB is too low, the first triode Q1 is further turned off, the second triode Q2 is also turned off, and at this time, the signal received by the corresponding port of the MCU chip is changed into '0'. The voltage between the voltage dividing resistor R2 and the adjustable resistor R4 is controlled to be 12V through a voltage stabilizing diode D1 (such as a 12V voltage stabilizing diode), and the time of power failure detection can be controlled by adjusting the voltage stabilizing voltages of the adjustable resistor R4 and the voltage stabilizing diode D1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the first transistor Q1 is used more here; a second transistor Q2; pull-up resistor R1; a pull-down resistor R3; a voltage dividing resistor R2; an adjustable resistor R4; zener diode D1, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. The utility model provides a low pressure servo power failure detection circuit, its characterized in that, is including waiting to detect power and switch circuit, switch circuit includes on-off control input side and on-off control controlled side, on-off control input side connect in wait to detect the power in order to wait to detect the power normal switch circuit that switches on, wait to detect the power disconnection turn-off switch circuit, the both ends of on-off control controlled side are one end respectively and are connected in the power end, and the other end passes through pull-down resistor and connects in the earthing terminal, just the one end that pull-down resistor kept away from the earthing terminal is connected in order to export the high level to the MCU chip when switch circuit switches on, exports the low level to.
2. The low voltage servo power-down detection circuit of claim 1, wherein the switching circuit comprises a first transistor and a second transistor, the base of the first transistor is a switching control input side connected to the power source to be detected, the controlled side of the first transistor is connected to the base of the second transistor to drive the second transistor when the first transistor is turned on, and the controlled side of the second transistor is the switching control controlled side.
3. The low voltage servo power-down detection circuit as claimed in claim 2, wherein the first transistor is an NPN transistor, the controlled side of the first transistor includes a collector and an emitter, the collector of the first transistor is connected to the power supply terminal through a pull-up resistor, the emitter is connected to the ground terminal, and the base of the second transistor is connected to the end of the pull-up resistor away from the power supply terminal.
4. The low-voltage servo power-down detection circuit according to claim 3, wherein the second transistor is a PNP transistor, the controlled side of the second transistor includes a collector and an emitter, the emitter of the second transistor is connected to the power supply terminal, the collector is connected to the ground terminal through a pull-down resistor, and the MCU chip is connected to a common terminal of the pull-down resistor and the collector.
5. The low-voltage servo power-down detection circuit according to claim 4, wherein the MCU chip is any DSP processor with GPIO interface.
6. The low-voltage servo power-down detection circuit according to claim 5, wherein the power supply terminal is a 3.3V DC power supply.
7. The low voltage servo power-down detection circuit of claim 6, wherein the switching circuit further comprises a power-down detection time adjusting circuit.
8. The low-voltage servo power-down detection circuit according to claim 7, wherein the power-down detection time adjusting circuit comprises a divider resistor connected in series between a collector of the first triode and a pull-up resistor, an adjustable resistor is connected in series between a base of the first triode and the power source to be detected, an adjusting end of the adjustable resistor is connected to the base of the first triode, and two ends of the adjustable resistor are respectively connected to the power source to be detected and an emitter of the first triode.
9. The low-voltage servo power-down detection circuit of claim 8, wherein the power-down detection time adjusting circuit further comprises a voltage stabilizing circuit connected in series between the adjustable resistor and the power source to be detected.
10. The low-voltage servo power-down detection circuit according to claim 9, wherein the voltage stabilizing circuit comprises a zener diode, a cathode of the zener diode is connected to the power source to be detected, and an anode of the zener diode is connected to the adjustable resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922267865.5U CN212060420U (en) | 2019-12-17 | 2019-12-17 | Low-voltage servo power-down detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922267865.5U CN212060420U (en) | 2019-12-17 | 2019-12-17 | Low-voltage servo power-down detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212060420U true CN212060420U (en) | 2020-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922267865.5U Active CN212060420U (en) | 2019-12-17 | 2019-12-17 | Low-voltage servo power-down detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212060420U (en) |
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2019
- 2019-12-17 CN CN201922267865.5U patent/CN212060420U/en active Active
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