CN212905296U - Detection circuit and power supply equipment - Google Patents
Detection circuit and power supply equipment Download PDFInfo
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- CN212905296U CN212905296U CN202021204804.0U CN202021204804U CN212905296U CN 212905296 U CN212905296 U CN 212905296U CN 202021204804 U CN202021204804 U CN 202021204804U CN 212905296 U CN212905296 U CN 212905296U
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Abstract
The utility model relates to an electronic circuit technical field discloses a detection circuitry and power supply unit. The detection circuit is applied to power supply equipment, power supply equipment includes power and circuit breaker, the power positive terminal is used for connecting the one end of load, the other end of load is connected with the first end of circuit breaker, the second end and the power negative pole end of circuit breaker are connected, the detection circuit includes switch circuit and optoelectronic coupler, switch circuit and optoelectronic coupler are connected, switch circuit realizes the switching action according to whether there is pressure differential at the circuit breaker both ends, optoelectronic coupler outputs alarm signal when switch circuit is closed, do not output alarm signal when switch circuit breaks. Because the embodiment of the utility model provides a detection circuitry has or not load to insert in considering the power output return circuit, avoids exporting unnecessary alarm signal to realize rationally reporting an emergency and asking for help or increased vigilance.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a detection circuitry and power equipment.
Background
In a power output loop of the air switch tripping alarm circuit, the positive terminal of a power supply is connected with one end of a load, the other end of the load is connected with one end of an air switch, the other end of the air switch is grounded, the input end of an alarm module is connected with the air switch, and the alarm module detects the working state of the air switch by judging the high and low levels of the input end and generates alarm information. The current air switch trip alarm circuit is shown in fig. 1a to 1 d.
As shown in fig. 1a, when the output loop is connected to the load Rload and the air switch SW is in the off state, the voltage at the input end of the Alarm module is pulled to the low level, that is, the Alarm signal received by the Alarm module is the low level, and the Alarm module generates the Alarm information because the low level is the valid signal.
As shown in fig. 1b, when the output loop is connected to the load Rload and the air switch SW is in the closed state, the voltage at the input end of the Alarm module is pulled to the high level, that is, the Alarm signal received by the Alarm module is at the high level, and the Alarm module does not generate the Alarm information because the high level is an invalid signal.
As shown in fig. 1c, when the load Rload is not connected to the output circuit and the air switch SW is in the closed state, the voltage at the input end of the alarm module is pulled to a low level, and the alarm module generates an alarm message.
As shown in fig. 1d, when the load Rload is not connected to the output circuit and the air switch SW is in the off state, the voltage at the input end of the alarm module is pulled to a low level, and the alarm module generates an alarm message.
In the power output circuit, if a load is connected to the power output circuit and an air switch connected in series to the power output circuit is turned off, such a situation needs to be warned. If the load is not connected to the power output loop, no matter the air switch is closed or opened, no alarm is needed.
However, since the load Rload is not accessed to the output circuit in fig. 1c and 1d, the Alarm signal received by the Alarm module is low regardless of whether the air switch SW is closed or open, and the Alarm module generates the Alarm information according to the low level, which is not reasonable since the Alarm is not needed when the load Rload is not accessed to the output circuit. Therefore, the level of the detection end when the air switch is closed or opened is received only through the alarm module, and whether the load is connected to the power output loop or not is not considered, so that unnecessary alarm can be generated.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the embodiment of the utility model provides a detection circuitry and power supply unit can solve current air switch dropout warning circuit and produce the technical problem that unnecessary reported an emergency and asked for help or increased vigilance owing to do not consider whether the load inserts power output return circuit.
The embodiment of the utility model provides a for solving above-mentioned technical problem provides following technical scheme:
in a first aspect, an embodiment of the present invention provides a detection circuit applied to a power supply device, wherein the power supply device includes a power supply and a circuit breaker, a positive power terminal is used for connecting one end of a load, the other end of the load is connected with a first end of the circuit breaker, a second end of the circuit breaker is connected with a negative power terminal, and the detection circuit includes: a first end of the switch circuit is connected with a first end of the circuit breaker, and a second end of the switch circuit is connected with a second end of the circuit breaker; the photoelectric coupler is connected with the third end of the switch circuit, when pressure difference exists between the first end and the second end of the circuit breaker, the switch circuit is closed, the signal output end of the photoelectric coupler outputs a first signal, when the pressure difference does not exist between the first end and the second end of the circuit breaker, the switch circuit is disconnected, and the signal output end of the photoelectric coupler outputs a second signal different from the first signal.
Optionally, the switching circuit includes a transistor, a base of the transistor is a first terminal of the switching circuit, an emitter of the transistor is a second terminal of the switching circuit, and a collector of the transistor is a third terminal of the switching circuit.
Optionally, the photocoupler includes a light emitting diode and a phototriode; the positive pole of emitting diode is used for being connected with auxiliary power supply, the negative pole of emitting diode with the collecting electrode of triode is connected, the phototriode projecting pole ground connection, when the phototriode received the light signal that emitting diode sent, the phototriode switches on, the collecting electrode output of phototriode the first signal, when the phototriode did not receive the light signal that emitting diode sent, the collecting electrode output of phototriode the second signal.
Optionally, the photoelectric coupler further comprises a current limiting circuit, one end of the current limiting circuit is connected with the third end of the switching circuit, and the other end of the current limiting circuit is connected with the photoelectric coupler.
Optionally, the switch circuit further comprises a first anti-reverse circuit, a first end of the first anti-reverse circuit is connected with a second end of the switch circuit, and a second end of the first anti-reverse circuit is grounded.
Optionally, the switch circuit further comprises a second anti-reverse connection circuit, a first end of the second anti-reverse connection circuit is connected with the third end of the switch circuit and the photoelectric coupler, and a second end of the second anti-reverse connection circuit is used for being connected with an auxiliary power supply.
Optionally, the circuit further comprises a voltage stabilizing circuit, a first end of the voltage stabilizing circuit is connected with a first end of the circuit breaker, and a second end of the voltage stabilizing circuit is connected with a first end of the switch circuit.
Optionally, the voltage stabilizing circuit further comprises a first resistor, one end of the first resistor is connected to the circuit breaker, and the other end of the first resistor is connected to the cathode of the voltage stabilizing diode.
In a first aspect, an embodiment of the present invention provides a power supply apparatus, including the detection circuit as described above.
The embodiment of the utility model provides a beneficial effect is: different from the prior art, the detection circuit and the power supply equipment are provided. The detection circuit is applied to power supply equipment, power supply equipment includes power and circuit breaker, the power positive terminal is used for connecting the one end of load, the other end of load is connected with the first end of circuit breaker, the second end and the power negative pole end of circuit breaker are connected, detection circuit includes switch circuit and optoelectronic coupler, switch circuit and optoelectronic coupler are connected, switch circuit realizes the switching action according to whether there is pressure differential at the circuit breaker both ends, optoelectronic coupler outputs alarm signal when switch circuit is closed, do not output alarm signal when switch circuit breaks. Because the embodiment of the utility model provides a detection circuitry has or not load to insert in considering the power output return circuit, avoids exporting unnecessary alarm signal to realize rationally reporting an emergency and asking for help or increased vigilance.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
Fig. 1a to 1d are schematic structural diagrams of a tripping alarm circuit of an air switch provided in the prior art;
fig. 2 is a schematic structural diagram of a power supply device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a detection circuit according to another embodiment of the present invention;
fig. 5a to 5d are schematic diagrams illustrating the working principle of the detection circuit according to the present invention.
Detailed Description
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In a first aspect, please refer to fig. 2, and fig. 2 is a schematic structural diagram of a power supply apparatus according to an embodiment of the present invention. As shown in fig. 2, the power supply apparatus 100 includes a power supply 10, a circuit breaker 20, and a detection circuit 30, wherein a positive terminal of the power supply 10 is connected to one terminal of a load, the other terminal of the load is connected to a first terminal of the circuit breaker 20, and a second terminal of the circuit breaker 20 is connected to a negative terminal of the power supply 10. In normal operation, the power source 10, the load and the circuit breaker 20 form a power output circuit.
The detection circuit 30 can detect the voltage across the circuit breaker 20, and the voltage across the circuit breaker 20 is not only related to the switching state of the circuit breaker 20, but also related to whether the load is connected to the power output circuit. Therefore, the detection circuit 30 can detect the on-off state of the circuit breaker 20, and also consider whether the output circuit has a load connected, so as to avoid the phenomenon that the alarm signal is still output when the power output circuit has no load connected, thereby realizing reasonable alarm.
In the present embodiment, the power supply apparatus 100 is used to supply power to a communication base station, and the load is a wireless receiving device of one communication base station. In which the power source 10 is a 48V dc power source, and the circuit breaker 20 is a switching device, such as an air switch, for connecting or disconnecting the power output circuit.
In a second aspect, please refer to fig. 3, fig. 3 is a schematic structural diagram of a detection circuit according to an embodiment of the present invention. As shown in fig. 3, the detection circuit 30 includes a switching circuit 31 and a photocoupler 32. Wherein, switching circuit 31 includes first end, second end and third end, and switching circuit 31's first end is connected with the first end of circuit breaker 20, and switching circuit 31's second end is connected with the second end of circuit breaker 20, and switching circuit 31's third end is connected with photocoupler 32.
When a certain voltage difference exists between the first end and the second end of the circuit breaker 20, the switch circuit 31 is closed, the signal output end of the photoelectric coupler 32 outputs a first signal, and when the voltage difference does not exist between the first end and the second end of the circuit breaker 20, the switch circuit 31 is opened, and the signal output end of the photoelectric coupler 32 outputs a second signal different from the first signal. It will be appreciated that if a load is not connected to the power output circuit, the power output circuit is open and therefore there is no voltage differential across the circuit breaker 20 whether the circuit breaker 20 is closed or open at that time.
The first signal is an effective level signal, and the level signal is input into the Alarm module as an Alarm signal to realize Alarm. The second signal is an invalid signal, and the alarm module does not generate alarm information when receiving the invalid signal.
In this embodiment, by detecting the voltages at the two ends of the circuit breaker 20 and considering whether the load is connected to the power output circuit, the detection circuit 30 outputs an effective signal only when the load is connected to the power output circuit and the circuit breaker 20 is disconnected, so that the present embodiment can implement reasonable alarm. Therefore, the problem that when the load is not connected with the power output loop, the unnecessary alarm signal is still output due to the fact that the existing air switch tripping alarm circuit only detects the switching state of the air switch and does not consider whether the load is connected with the power output loop or not can be solved.
In some embodiments, please refer to fig. 4, and fig. 4 is a schematic structural diagram of a detection circuit according to another embodiment of the present invention. As shown in fig. 4, the switching circuit 31 includes a transistor Q1, a base of a transistor Q1 is a first terminal of the switching circuit 31, an emitter of a transistor Q1 is a second terminal of the switching circuit 31, and a collector of a transistor Q1 is a third terminal of the switching circuit 31. That is, the base of the transistor Q1 is connected to the first terminal of the circuit breaker 20, the emitter of the transistor Q1 is connected to the second terminal of the circuit breaker 20, and the collector of the transistor Q1 is connected to the photocoupler 32. The emitter of the transistor Q1, the second terminal of the circuit breaker 20, and the negative terminal of the power supply 10 are commonly grounded.
When a voltage difference exists across the circuit breaker 20, the transistor Q1 is in saturation conduction due to the conduction condition being reached, the collector voltage of the transistor Q1 is pulled to a low level through the emitter, and at the moment, the current flows through the transistor Q1; when there is no voltage difference across the circuit breaker 20, the transistor Q1 is turned off without reaching the conducting condition, and the collector of the transistor Q1 is in a high-impedance state with respect to ground.
It is to be noted that, under the technical idea of the present embodiment, the transistor Q1 may be replaced by any suitable switching device, such as a MOS transistor, a thyristor, etc., as long as it can achieve the purpose of the present embodiment.
In some embodiments, as shown in fig. 4, the photocoupler 32 includes a light emitting diode 321 and a phototransistor 322, an anode of the light emitting diode 311 is connected to the auxiliary power source V1, a cathode of the light emitting diode 311 is connected to a collector of a transistor Q1, an emitter of the phototransistor 322 is grounded, the phototransistor 322 is turned on when the phototransistor 322 receives the light signal from the light emitting diode 321, a collector of the phototransistor 322 outputs a first signal, and a collector of the phototransistor 322 outputs a second signal when the phototransistor 322 does not receive the light signal from the light emitting diode 321. The auxiliary power supply V1 is used to provide the current flowing through the led 321.
The photocoupler 32 transmits an electric signal using light as a medium, and has a good isolation function for input and output electric signals. The photoelectric coupler mainly comprises three parts: light emission, light reception and signal amplification. The input electric signal drives a Light Emitting Diode (LED) to emit light with a certain wavelength, the light is received by a light receiver to generate a photocurrent, and the photocurrent is further amplified and then output, so that the electric-optical-electric conversion is completed.
In this embodiment, when the transistor Q1 is turned on in saturation, the collector voltage of the transistor Q1 is pulled to a low level, and a current flows through the light emitting diode 321, so that the light emitting diode 321 emits light, the photo transistor 322 is turned on after receiving the light, and the collector voltage of the photo transistor 322 is pulled to a low level, thereby outputting a low level valid signal (i.e. the first signal), which is received by the alarm module to generate the alarm message. When the transistor Q1 is turned off, the electrode-to-ground of the transistor Q1 is in a high-impedance state, the light emitting diode 321 has no current flowing through it, and the electrode-to-ground of the photo transistor 322 is in a high-impedance state, so as to output an invalid signal (i.e., a second signal), and the alarm module does not generate alarm information.
In some embodiments, the detection circuit 30 further includes a current limiting circuit 33, one end of the current limiting circuit 33 is connected to the third terminal of the switch circuit 31, and the other end of the current limiting circuit 33 is connected to the photocoupler 32. The current limiting circuit 33 can limit the current flowing through the light emitting diode 321, thereby preventing the light emitting diode 321 from being damaged under high current.
Further, the current limiting circuit 33 includes a resistor R1, one end of the resistor R1 is connected to the collector of the transistor Q1, and the other end of the resistor R1 is connected to the cathode of the light emitting diode 321.
In some embodiments, the detection circuit 30 further includes a first anti-reverse circuit 34, a first terminal of the first anti-reverse circuit 34 is connected to the second terminal of the switch circuit 31, and a second terminal of the first anti-reverse circuit 34 is grounded.
Specifically, the first anti-reverse circuit 34 includes a diode D1, an anode of the diode D1 is a first end of the first anti-reverse circuit 34, and a cathode of the diode D1 is a second end of the first anti-reverse circuit 34.
By utilizing the unidirectional conduction characteristic of the diode, the first anti-reverse circuit 34 can play a role in preventing reverse-flushing and reverse-flow of current.
In some embodiments, the detection circuit 30 further includes a second anti-reverse circuit 35, a first terminal of the second anti-reverse circuit 35 is connected to the third terminal of the switch circuit 31 and the photocoupler 32, and a second terminal of the second anti-reverse circuit 35 is configured to be connected to the auxiliary power supply V1.
Specifically, the second anti-reverse circuit 35 includes a diode D2, an anode of the diode D2 is a first end of the second anti-reverse circuit 35, and a cathode of the diode D2 is a second end of the second anti-reverse circuit 35.
More specifically, the anode of the diode D2 is connected to the cathode of the light emitting diode 321, and the cathode of the diode D2 is connected to the anode of the light emitting diode 321 and the auxiliary power source V1.
The second anti-reverse circuit 35 also plays a role in preventing reverse-current and reverse-current, and since the anode of the diode D2 is connected to the cathode of the led 321 and the cathode of the diode D2 is connected to the anode of the led 321, the diode D2 can prevent the led 321 from being damaged due to insufficient reverse withstand voltage.
In some embodiments, the detection circuit 30 further includes a stabilizing circuit 36, a first terminal of the stabilizing circuit 36 is connected to a first terminal of the circuit breaker 20, and a second terminal of the stabilizing circuit 36 is connected to a first terminal of the switching circuit 31. When the load is connected to the power output circuit and the switch of the circuit breaker 20 is turned off, the positive terminal of the power supply 10, the load, the voltage stabilizing circuit 36, the switch circuit 31 and the negative terminal of the power supply 10 form a new power output circuit, and the voltage stabilizing circuit 36 can prevent a higher voltage from being applied to the load when the switch of the circuit breaker 20 is turned off, thereby playing a role in protecting the load.
Further, the voltage stabilizing circuit 36 includes a zener diode Dz, an anode of the zener diode Dz is the second terminal of the voltage stabilizing circuit 36, and a cathode of the zener diode Dz is the first terminal of the voltage stabilizing circuit 36.
Further, the voltage stabilizing circuit 36 further includes a resistor R2, one end of the resistor R2 is connected to the cathode of the zener diode Dz, and the other end of the resistor R2 is connected to the first end of the circuit breaker 20.
For a detailed description of the various embodiments of the present invention, reference is made to fig. 5a to 5 d.
As shown in fig. 5a, the power output circuit is connected to the load, and the circuit breaker 20 is in a closed state, and there is no voltage difference across the circuit breaker 20, so that the transistor Q1 is turned off, and thus no current flows through the light emitting diode 311, and the photo transistor 322 is turned off, and at this time, an invalid signal is output without warning.
As shown in fig. 5b, the power output circuit is connected to the load, and the circuit breaker 20 is in an off state, and a voltage difference exists across the circuit breaker 20, so that the transistor Q1 is in a saturated conduction state, and thus the light emitting diode 311 has a current flowing through it to emit light, the phototransistor 322 is turned on after receiving the light, and the collector voltage of the phototransistor 322 is pulled to a low level, at this time, a valid signal is output, and an alarm is given.
As shown in fig. 5c and 5d, the power output circuit is not connected to the load, and no matter the circuit breaker 20 is in the closed state or the open state, no pressure difference exists in the circuit breaker 20, and according to the previous analysis, neither of the two situations gives an alarm.
Therefore, the embodiment of the present invention provides a detection circuit 30, which can avoid outputting unnecessary alarm signal due to the consideration of the condition of load access in the power output loop, thereby realizing reasonable alarm.
Finally, it is to be understood that the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are intended as additional limitations on the scope of the invention, as these embodiments are provided so that the disclosure will be thorough and complete. In addition, under the idea of the present invention, the above technical features are combined with each other continuously, and many other variations of the present invention in different aspects as described above are considered as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a detection circuitry, is applied to power supply unit, wherein, power supply unit includes power and circuit breaker, the positive terminal of power is used for connecting the one end of load, the other end of load with the first end of circuit breaker is connected, the second end of circuit breaker with power negative pole end connection, its characterized in that, detection circuitry includes:
a first end of the switch circuit is connected with a first end of the circuit breaker, and a second end of the switch circuit is connected with a second end of the circuit breaker;
the photoelectric coupler is connected with the third end of the switch circuit, when pressure difference exists between the first end and the second end of the circuit breaker, the switch circuit is closed, the signal output end of the photoelectric coupler outputs a first signal, when the pressure difference does not exist between the first end and the second end of the circuit breaker, the switch circuit is disconnected, and the signal output end of the photoelectric coupler outputs a second signal different from the first signal.
2. The detection circuit of claim 1, wherein the switching circuit comprises a transistor, a base of the transistor is a first terminal of the switching circuit, an emitter of the transistor is a second terminal of the switching circuit, and a collector of the transistor is a third terminal of the switching circuit.
3. The detection circuit of claim 2, wherein the photocoupler includes a light emitting diode and a phototriode;
the positive pole of emitting diode is used for being connected with auxiliary power supply, the negative pole of emitting diode with the collecting electrode of triode is connected, the phototriode projecting pole ground connection, when the phototriode received the light signal that emitting diode sent, the phototriode switches on, the collecting electrode output of phototriode the first signal, when the phototriode did not receive the light signal that emitting diode sent, the collecting electrode output of phototriode the second signal.
4. The detection circuit according to any one of claims 1 to 3, further comprising a current limiting circuit, wherein one end of the current limiting circuit is connected to the third end of the switching circuit, and the other end of the current limiting circuit is connected to the photocoupler.
5. The detection circuit according to any one of claims 1 to 3, further comprising a first anti-reverse circuit, wherein a first end of the first anti-reverse circuit is connected to the second end of the switch circuit, and a second end of the first anti-reverse circuit is grounded.
6. The detection circuit according to any one of claims 1 to 3, further comprising a second anti-reverse circuit, wherein a first end of the second anti-reverse circuit is connected with a third end of the switch circuit and the photoelectric coupler, and a second end of the second anti-reverse circuit is used for being connected with an auxiliary power supply.
7. The detection circuit according to any one of claims 1 to 3, further comprising a regulator circuit, a first terminal of the regulator circuit being connected to the first terminal of the circuit breaker, and a second terminal of the regulator circuit being connected to the first terminal of the switching circuit.
8. The detection circuit of claim 7, wherein the regulation circuit includes a zener diode, an anode of the zener diode being connected to the first terminal of the switching circuit, and a cathode of the zener diode being connected to the first terminal of the circuit breaker.
9. The detection circuit of claim 8, wherein the regulator circuit further comprises a first resistor, one end of the first resistor is connected to the circuit breaker, and the other end of the first resistor is connected to the cathode of the zener diode.
10. A power supply device characterized by comprising a detection circuit according to any one of claims 1 to 9.
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|---|---|---|---|
| CN202021204804.0U CN212905296U (en) | 2020-06-24 | 2020-06-24 | Detection circuit and power supply equipment |
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| CN202021204804.0U CN212905296U (en) | 2020-06-24 | 2020-06-24 | Detection circuit and power supply equipment |
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| CN212905296U true CN212905296U (en) | 2021-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
| CN113891521B (en) * | 2021-11-05 | 2023-09-19 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
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