CN112946350A - Single-phase voltage stability monitoring alarm circuit and device - Google Patents
Single-phase voltage stability monitoring alarm circuit and device Download PDFInfo
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- CN112946350A CN112946350A CN202110231467.7A CN202110231467A CN112946350A CN 112946350 A CN112946350 A CN 112946350A CN 202110231467 A CN202110231467 A CN 202110231467A CN 112946350 A CN112946350 A CN 112946350A
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
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Abstract
The invention relates to the technical field of circuit design, in particular to a single-phase voltage stability monitoring alarm circuit and a single-phase voltage stability monitoring alarm device. It includes: the voltage detection circuit comprises a rectification filter circuit, a first voltage detection circuit, a second voltage detection circuit and an abnormal voltage alarm circuit. The rectification sampling circuit is used for carrying out rectification filtering processing on input single-phase alternating current to obtain a direct-current voltage signal; the first voltage detection circuit is used for detecting whether the direct-current voltage signal is lower than a first preset reference voltage or not, if so, a boosting trigger signal is output, and the boosting circuit is triggered to perform boosting processing; the second voltage detection circuit is used for detecting whether the direct-current voltage signal is higher than a second preset reference voltage or not, if so, a voltage reduction trigger signal is output, and the voltage reduction circuit is triggered to carry out voltage reduction processing; the abnormal voltage alarm circuit is used for detecting whether the direct current voltage signal is lower than a preset undervoltage alarm voltage or higher than a preset high-voltage alarm voltage, and if so, outputting an abnormal alarm trigger signal to trigger the alarm to alarm.
Description
Technical Field
The invention relates to the technical field of circuit design, in particular to a single-phase voltage stability monitoring alarm circuit and a single-phase voltage stability monitoring alarm device.
Background
With the development of society and the rapid advance of industry, electronic equipment is more and more applied to a plurality of industry fields, but the electronic equipment is more easily subjected to electromagnetic interference of external environment than analog equipment, some special industries such as nuclear power generation industry have extremely high requirements on equipment reliability, and certain specific occasions require that only the analog equipment can be used and chip electronic equipment is forbidden.
There is a general need in the power industry to control ac voltages, particularly ac single phase voltages, in addition to the power industry, as well as in other areas. Because chip electronic equipment has the characteristics of low price, low technical difficulty, short development period and the like compared with analog equipment, most manufacturers use the manufacturing voltage control equipment, almost few manufacturers research and develop the analog voltage control equipment, and the requirements of special industries such as nuclear power generation industry and the like are difficult to meet and depend on imported products.
In order to meet the requirement for stable control of single-phase alternating-current voltage under the special requirement, it is urgently needed to develop a pure analog control device which can accurately monitor voltage change and make a quick response.
Disclosure of Invention
The application provides a single-phase voltage stability monitoring alarm circuit and device, mainly used monitoring exchanges single-phase voltage's change.
A single-phase voltage stability monitoring alarm circuit, comprising: the voltage detection circuit comprises a rectification filter circuit, a first voltage detection circuit, a second voltage detection circuit and an abnormal voltage alarm circuit;
the rectification sampling circuit is used for carrying out rectification filtering processing on input single-phase alternating current to obtain a direct-current voltage signal;
the first voltage detection circuit is used for detecting whether the direct-current voltage signal is lower than a first preset reference voltage or not, and outputting a boosting trigger signal if the direct-current voltage signal is lower than the first preset reference voltage;
the second voltage detection circuit is used for detecting whether the direct-current voltage signal is higher than a second preset reference voltage or not, and outputting a voltage reduction trigger signal if the direct-current voltage signal is higher than the second preset reference voltage;
the abnormal voltage alarm circuit is used for detecting whether the direct current voltage signal is lower than a preset undervoltage alarm voltage or higher than a preset high-voltage alarm voltage, and if so, outputting an abnormal alarm trigger signal.
In one embodiment, the rectification sampling circuit comprises a first isolation transformer, a first rectification circuit and a filter circuit;
the first isolation transformer is used for carrying out safety isolation processing on input single-phase alternating current, and the first rectifying circuit is used for rectifying the single-phase alternating current output by the first isolation transformer to obtain an initial direct-current voltage signal; the filter circuit is used for filtering the initial direct current voltage signal and removing the alternating current voltage signal to obtain the direct current voltage signal.
In one embodiment, the first voltage detection circuit includes: a first comparator, a first transistor, and a first relay;
the positive input end of the first comparator is used for inputting a first preset reference voltage, and the negative input end of the first comparator is used for inputting the direct-current voltage signal; the output end of the first comparator is connected with the control electrode of the first transistor, the first electrode of the first transistor is connected with preset conduction voltage, the second electrode of the first transistor is connected with the input end of the first relay, and the output end of the first relay is used for outputting the boosting trigger signal.
In one embodiment, the first voltage detection circuit further comprises a first resistor and a first adjustable resistor;
one end of the first resistor is connected with the output end of the rectification sampling circuit, the other end of the first resistor is connected with one end of the first adjustable resistor, and the other end of the first adjustable resistor is grounded; the other end of the first resistor is connected with one input end of the first comparator and used for inputting the direct current signal; and the voltage output end of the first adjustable resistor is connected with the input end of the other end of the first comparator and used for inputting the first preset reference voltage.
In one embodiment, the second voltage detection circuit includes: a second comparator, a second transistor, and a second relay;
the positive input end of the second comparator is used for inputting a second preset reference voltage, and the negative input end of the second comparator is used for inputting the direct-current voltage signal; the output end of the second comparator is connected with the control electrode of the second transistor, the first electrode of the second transistor is connected with preset conduction voltage, the second electrode of the second transistor is connected with the input end of the second relay, and the output end of the second relay is used for outputting the voltage reduction trigger signal.
In one embodiment, the device further comprises a second adjustable resistor, one end of the second adjustable resistor is connected with the other end of the first resistor, and the other end of the second adjustable resistor is grounded; and the voltage output end of the second adjustable resistor is connected with the positive input end of the second comparator and used for inputting the second preset reference voltage.
In one embodiment, the abnormal voltage warning circuit comprises a third adjustable resistor, a fourth adjustable resistor, a fifth adjustable resistor, a third comparator, a fourth comparator, a fifth comparator, a third transistor and a third relay;
the positive input end of the third comparator is used for inputting the direct-current voltage signal, the reverse input end of the third comparator is grounded, the output end of the third comparator is connected with one end of a third adjustable resistor, the other end of the third adjustable resistor is grounded, and the output end of the third adjustable resistor is connected with the positive input end of the fourth comparator; one end of the fourth adjustable resistor is connected with the direct-current voltage signal, the other end of the fourth adjustable resistor is grounded, the output end of the fourth adjustable resistor is connected with the inverting input end of the fourth comparator, the output end of the fourth comparator is connected with the control electrode of the third transistor, the first electrode of the third transistor is connected with preset on-state voltage, and the second electrode of the third transistor is connected with the input end of the third relay; the output end of the third relay is used for outputting the abnormal alarm signal;
one end of the fifth adjustable resistor is connected with the direct-current voltage signal, the other end of the fifth adjustable resistor is grounded, the output end of the fifth adjustable resistor is connected with the positive input end of the fifth comparator, the negative input end of the fifth comparator is connected with the direct-current voltage signal, and the output end of the fifth comparator is connected with the control electrode of the third transistor.
In one embodiment, the power supply further comprises a second isolation transformer and a second rectifying circuit;
the second isolation transformer is used for carrying out safety isolation processing on the input single-phase alternating current, and the second rectifying circuit is used for rectifying the single-phase alternating current output by the second isolation transformer to obtain a direct-current voltage signal.
In one embodiment, the device further comprises a first diode and a second diode; the anode of the first diode is connected with the output end of the fourth comparator, and the cathode of the first diode is connected with the control electrode of the third transistor; the anode of the second diode is connected to the output terminal of the fifth comparator, and the cathode of the second diode is also connected to the control electrode of the third transistor.
A single-phase voltage stability monitoring and alarming device comprises the single-phase voltage stability monitoring and alarming circuit.
According to single-phase voltage stabilization monitoring alarm circuit and device of above-mentioned embodiment, it includes: the voltage detection circuit comprises a rectification filter circuit, a first voltage detection circuit, a second voltage detection circuit and an abnormal voltage alarm circuit. The rectification sampling circuit is used for carrying out rectification filtering processing on input single-phase alternating current to obtain a direct-current voltage signal; the first voltage detection circuit is used for detecting whether the direct-current voltage signal is lower than a first preset reference voltage or not, if so, a boosting trigger signal is output, and the boosting circuit is triggered to perform boosting processing; the second voltage detection circuit is used for detecting whether the direct-current voltage signal is higher than a second preset reference voltage or not, if so, a voltage reduction trigger signal is output, and the voltage reduction circuit is triggered to carry out voltage reduction processing; the abnormal voltage alarm circuit is used for detecting whether the direct current voltage signal is lower than a preset undervoltage alarm voltage or higher than a preset high-voltage alarm voltage, and if so, outputting an abnormal alarm trigger signal to trigger an alarm to alarm and prompt a worker to process in time.
Drawings
Fig. 1 is a schematic structural diagram of a single-phase voltage stability monitoring alarm circuit according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a circuit structure for rectification according to an embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a comparator according to an embodiment of the present disclosure.
Fig. 4 is a schematic circuit diagram of a preset reference voltage part according to an embodiment of the present disclosure.
Fig. 5 is a schematic circuit diagram of a transistor portion according to an embodiment of the present application.
Fig. 6 is a schematic circuit diagram of a relay part according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a protection cover for encapsulating a circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning.
The transistor in this application is a three-terminal transistor, and its three terminals are a control electrode, a first electrode and a second electrode. The transistor may be a bipolar transistor, a field effect transistor, or the like. For example, when the transistor is a bipolar transistor, the control electrode of the transistor refers to a base electrode of the bipolar transistor, the first electrode may be a collector or an emitter of the bipolar transistor, and the corresponding second electrode may be an emitter or a collector of the bipolar transistor; when the transistor is a field effect transistor, the control electrode refers to a gate electrode of the field effect transistor, the first electrode may be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be a source electrode or a drain electrode of the field effect transistor. In this embodiment, a circuit structure of the present application will be described by taking an NPN-type bipolar transistor as an example.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a single-phase voltage stability monitoring alarm circuit, which includes: the voltage detection circuit comprises a rectifying and filtering circuit 1, a first voltage detection circuit 2, a second voltage detection circuit 3 and an abnormal voltage alarm circuit 4. The rectification sampling circuit 1 is used for carrying out rectification filtering processing on input single-phase alternating current to obtain a direct-current voltage signal; the first voltage detection circuit 2 is configured to detect whether the dc voltage signal is lower than a first preset reference voltage, and if so, output a boost trigger signal, where the boost trigger signal is sent to the boost circuit, and is used to trigger the boost circuit to operate, so as to boost the single-phase ac power. The second voltage detection circuit 2 is used for detecting whether a direct-current voltage signal on the current trunk circuit is higher than a second preset reference voltage or not, and if so, outputting a voltage reduction trigger signal, wherein the voltage reduction trigger signal is used for triggering a voltage reduction circuit, and the voltage reduction circuit is used for carrying out voltage reduction on single-phase alternating current. The abnormal voltage alarm circuit is used for detecting whether the direct current voltage signal is lower than a preset undervoltage alarm voltage or higher than a preset high-voltage alarm voltage, and if so, outputting an abnormal alarm trigger signal to prompt a worker to process in time. Therefore, the single-phase voltage stability monitoring alarm circuit can be used for accurately monitoring the voltage of the single-phase alternating current on the main line in real time, and carrying out corresponding processing according to the monitoring result, so that the output single-phase alternating current meets the preset requirement.
The rectifying and sampling circuit 1 of the present embodiment includes a first isolation transformer T1, a first rectifying circuit B1, and a filter circuit L1; the first isolation transformer is used for carrying out safety isolation processing on the input single-phase alternating current, and the first rectifying circuit B1 is used for rectifying the single-phase alternating current output by the first isolation transformer to obtain an initial direct-current voltage signal; the filter circuit L1 is configured to filter the initial dc voltage signal, remove the ac voltage signal therein, and obtain a final dc voltage signal, where the dc voltage signal output by the filter circuit is used as a reference voltage for monitoring.
Specifically, as shown in fig. 2, the rectification sampling circuit of this embodiment specifically includes a first isolation transformer T1, an LC filter circuit, and a full-bridge rectification circuit, an output end of the first isolation transformer T1 is connected to an input end of the LC filter circuit, and an output end of the LC filter circuit is connected to an input end of the full-bridge rectification circuit. Specifically, the rectification sampling circuit comprises a fuse F1, a first isolation transformer T1, a diode B11, a diode B12, a diode B13, a diode B14, an inductor L2, a light-emitting diode D104, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R9, a resistor R10 and a voltage regulator tube D41. L1 and N1 of single-phase alternating current are connected with a primary winding of a first isolation transformer T1, an anode output end of a secondary winding of the first isolation transformer T1 is connected with an anode of a diode B11, a cathode of a diode B11 is connected with a cathode of a diode B12, an anode of a diode B12 is connected with a cathode of the diode B14, an anode of a diode B14 is connected with an anode of a diode B13, a cathode of a diode B13 is connected with an anode of a diode B11, and a secondary winding of a first isolation transformer T1 is connected with an anode of a diode B12. One end of the inductor L2 is connected with the cathode of the B12, the other end of the inductor L2 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the anode of the B14; capacitors C2 and C3 are connected in parallel to the capacitor C1, one end of a resistor R9 is connected to the other end of the L2, the other end is connected to the anode of the light emitting diode D104, the cathode of the light emitting diode D104 is connected to the anode of the B14, one end of a resistor R10 is connected to one end of the resistor R9, the other end is connected to the cathode of the light emitting diode D104, and a voltage regulator D41 (i.e., a TVS transistor, also called a bidirectional transient suppression diode) is connected in parallel to the resistor R10. One end of the resistor R9 is grounded through a capacitor, and the anode of the B14 is grounded through a capacitor C41. Both ends of the voltage regulator tube D41 output a dc voltage signal. Wherein the led D104 serves as an indication. The diode B11, the diode B12, the diode B13 and the diode B14 form a full-bridge rectification circuit, alternating-current voltage is rectified into direct-current voltage, and the inductor L2, the capacitor C1, the capacitor C2 and the capacitor C3 form an LC filter circuit to filter high-frequency and low-frequency alternating-current components. And a current-limiting resistor R10 and a light-emitting diode D104 are connected in parallel at two ends of the capacitor C3, and if the D104 is bright, the input side is normal. And finally, the transient suppression diode D41 is connected in parallel to absorb transient abnormal electric energy to be used as the protection of the back-end circuit.
The first voltage detection circuit of the present embodiment includes: the circuit comprises a first comparator A1, a first transistor D1, a first relay S1, a first resistor R1 and a first adjustable resistor R2. A positive input end of the first comparator A1 is used for inputting a first preset reference voltage, and a negative input end thereof is used for inputting a direct-current voltage signal; the output end of the first comparator A1 is connected with the base of a first transistor D1 through a resistor R8, the collector of the first transistor is connected with a preset conducting voltage, the emitter of the first transistor is connected with the input end of a first relay S1, and the output end of the first relay is used for outputting a boosting trigger signal. When the first comparator a1 determines that the input dc voltage signal is lower than the preset first preset reference voltage, it sends a driving signal to drive the first transistor D1 to turn on, so that the first relay S1 is attracted and turned on to output the boost trigger signal.
One end of the first resistor R1 is connected with a preset voltage of +12V, one end of the first resistor R1 is further connected with the output end of the rectification sampling circuit, the other end of the first resistor R1 is connected with one end of the first adjustable resistor R2, and the other end of the first adjustable resistor R2 is grounded; the other end of the first resistor R1 is connected with the negative input end of the first comparator A1 and used for inputting a direct-current signal; the voltage output end of the first adjustable resistor R2 is connected to the positive input end of the first comparator a1, and is used for inputting a first preset reference voltage, and the first reference voltage input by the first comparator a1 can be adjusted by adjusting the resistance value of the first adjustable resistor R2, so that the first reference voltage can be adjusted according to the requirements of users. The second voltage detection circuit includes: a second comparator, a second transistor, and a second relay;
the second voltage detection circuit of the present embodiment includes: a second comparator a2, a second transistor D2, and a second relay S2. The positive input terminal of the second comparator a2 of this embodiment is used for inputting the second preset reference voltage, and the negative input terminal thereof is used for inputting the dc voltage signal; the output end of the second comparator A2 is connected with the base of a second transistor D2 through a resistor R7, the collector of the second transistor D2 is connected with +12V conduction voltage, the emitter of the second transistor D2 is connected with the input end of a second relay S2, and the output end of the second relay S2 is used for outputting a voltage reduction trigger signal. Specifically, the second voltage detection circuit further includes a second adjustable resistor R3, one end of the second adjustable resistor R3 is connected to the other end of the first resistor R1, and the other end of the second adjustable resistor R3 is grounded; the voltage output end of the second adjustable resistor R3 is connected to the positive input end of the second comparator a2, and the positive input end is used for inputting a second preset reference voltage. Likewise, the resistance of the second adjustable resistor R3 is adjustable, i.e., the second preset reference voltage of the input of the second comparator a2 is adjustable, to meet different voltage settings of the user. When the second comparator a2 determines that the input dc voltage signal is higher than the set second preset reference voltage, the second transistor D2 is driven to conduct, so as to drive the second relay S2 to conduct, so as to output the step-down trigger signal to trigger the step-down circuit, thereby implementing the step-down processing of the voltage of the output main line.
The abnormal voltage alarm circuit comprises a third adjustable resistor R5, a fourth adjustable resistor, a fifth adjustable resistor, a third comparator A3, a fourth comparator A4, a fifth comparator A5, a third transistor D3 and a third relay S3. The positive input end of the third comparator A3 is used for inputting a direct-current voltage signal, the reverse input end thereof is grounded, the output end thereof is connected with one end of a third adjustable resistor R5, the other end of the third adjustable resistor R5 is grounded, and the output end of the third adjustable resistor R5 is connected with the positive input end of the fourth comparator a 4; one end of a fourth adjustable resistor R4 is connected with one end of the first resistor R1, the end is used for inputting direct-current voltage signals, the other end of the fourth adjustable resistor R4 is grounded, the output end of the fourth adjustable resistor R4 is connected with the inverting input end of the fourth comparator A4, the output end of the fourth comparator A4 is connected with the base electrode of the third transistor D3, the collector electrode of the third transistor is connected with preset conduction voltage +12V, the emitter electrode of the third transistor is connected with the input end of the third relay S3, the output end of the third relay S3 is used for outputting abnormal alarm signals, and the abnormal alarm signals can trigger an alarm device to further remind a worker to process in time. One end of the fifth adjustable resistor R6 is connected to one end of the first resistor R1, the other end of the fifth adjustable resistor R6 is grounded, the output end of the fifth adjustable resistor R6 is connected to the positive input end of the fifth comparator a5, the inverting input end of the fifth comparator a5 is connected to the dc voltage signal, and the output end of the fifth comparator a5 is connected to the base of the third transistor D3. The fourth comparator a4 inputs the first reference voltage and the dc voltage signal, respectively, for determining whether the current dc voltage signal is lower than the preset first reference voltage signal, if yes, it is turned on, that is, it outputs the alarm trigger signal. Correspondingly, the fifth comparator a5 inputs a second reference voltage signal and a dc voltage signal, and when the fifth comparator a5 determines that the current dc voltage signal is higher than the second reference voltage signal, the D3 is triggered to conduct, so that the third relay S3 attracts and conducts, and an alarm trigger signal is output.
Further, the circuit of this embodiment further includes a second isolation transformer T2 and a second rectification circuit B2, where the second isolation transformer T2 is configured to perform safety isolation processing on the input single-phase alternating current, the second rectification circuit B2 is configured to perform rectification processing on the single-phase alternating current output by the second isolation transformer T2 to obtain a direct-current voltage signal, an output end of the second rectification circuit B2 is connected to a positive input end of the third comparator A3, and then the direct-current voltage signal is output to the third comparator A3. The specific circuit structure of the second isolation transformer T2 is the same as that of the first isolation transformer T1, and the circuit structure of the second rectifier circuit B2 is the same as that of the first rectifier circuit B1.
In another embodiment, the circuit further comprises a first diode and a second diode; the anode of the first diode is connected with the output end of the fourth comparator A4, and the cathode of the first diode is connected with the base of the third transistor D3; the anode of the second diode is connected to the output terminal of the fifth comparator a5, and the cathode of the second diode is also connected to the base of the third transistor D3.
In this embodiment, the first preset reference voltage is set to 90% of the voltage reference value (i.e., the target reference voltage), and the second preset reference voltage is set to 101% of the voltage reference value.
In the present embodiment, the first relay S1 and the second relay S2 both use a single-pole double-throw relay (also referred to as an SPDT relay), and the third relay is a single-pole single-throw relay (also referred to as an SPST relay).
Fig. 3 is a circuit diagram of a specific comparator provided in this embodiment, which includes diodes D25, D26, an operational amplifier U2B, a capacitor C44, a resistor R15, and a capacitor C0, wherein a cathode of the diode D25 is connected to a negative input terminal of the operational amplifier U2B, an anode thereof is connected to a cathode of the operational amplifier U26, a cathode of the diode D25 is connected to an anode of the operational amplifier D26, a cathode of the diode D26 is connected to a positive input terminal of the operational amplifier U2B, one end of the resistor R15 is connected to a cathode of the operational amplifier U25, the other end thereof is connected to an output terminal of the operational amplifier U2B, the capacitor C0 is connected in parallel to the resistor R15, one end of the capacitor C44 is connected to a voltage of +12V, and. A set voltage (e.g., 230VAC) is coupled to the positive input of the operational amplifier U2B (e.g., U2B may contain 4 operational amplifiers, of which U2B is 1) and the negative input of the operational amplifier U2C, a sampled voltage is coupled to the negative input of the operational amplifier U2B and the positive input of the operational amplifier U2C, and the negative input is isolated from the positive input by elements D25 and D26. The operational amplifier adopts a classical operational amplifier peripheral circuit, when the sampling voltage is higher than the set voltage, the voltage of the negative input end of the operational amplifier U2B is higher than that of the positive input end, the operational amplifier U2B outputs a low level, the voltage of the negative input end of the operational amplifier U2C is lower than that of the positive input end, and the operational amplifier U2C outputs a high level; when the sampling voltage is lower than the set voltage, the situation is reversed, the operational amplifier U2B outputs a high level, and the operational amplifier U2C outputs a low level.
Fig. 4 is a schematic diagram of a partial circuit structure of the first preset reference voltage and the second preset reference voltage part of the present embodiment, the voltage setting value can be adjusted by adjusting the potentiometer RH1, the voltage adjustment range can be ± 5% of the rated voltage (for example, AC230), and in other embodiments, potentiometers with other parameters can be selected as needed to change the voltage adjustment range.
Fig. 5 is a circuit diagram of a transistor part according to an embodiment of the present disclosure, for example, circuit structures of D1, D2, and D3 can be taken as an example, a base of the transistor Q2 is connected to an output terminal of the budget amplifier U2C in fig. 4, when U2B outputs a high level, a base of the transistor Q2 is triggered, a collector and an emitter are conducted, a 12VDC power supply of the collector is conducted to the emitter, and a subsequent relay is driven to be conducted; when the operational amplifier U2C outputs a high level, the transistor Q3 triggers to drive the relay at the rear end to turn on.
Fig. 6 shows a circuit of an output part of the relay (which may be a first relay or a second relay) of the present embodiment, and the circuit connection of the first relay or the second relay of the present embodiment is the same, and the second relay S2 is described here. The coil A1 of the second relay S2 is connected with the emitter of the transistor D2, the A2 is connected with the signal ground, the second relay S2 is provided with 1 group of conversion contacts, a normally open contact is used, one end of the conversion contacts is connected with the common end of the output terminal, the other end of the conversion contacts is connected with the boosted signal of the output terminal, when the sampling voltage is lower than the set voltage, the operational amplifier U2B outputs high level, the driving transistor D2 is conducted, the driving relay S2 is attracted, the common end of the output terminal is conducted with the boosted signal, and a group of boosted trigger signals are output to the outside. Similarly, the first relay outputs a group of boosting trigger signals to the outside, that is, external voltage can be controlled, for example, the position of a carbon brush of an external motor is controlled, so that the input preset voltage is controlled.
In another embodiment, as shown in fig. 7, the single-phase voltage stability monitoring and alarming circuit of this embodiment is disposed on a circuit board, the circuit board is disposed in the heat dissipation cover 5, and a plurality of strip-shaped heat dissipation holes are disposed on a side surface of the heat dissipation cover. The body of the heat dissipation cover 5 can be made of 304 stainless steel, and the size of the strip heat dissipation holes 51 can prevent fingers or other medium-sized foreign objects from entering, and meanwhile, the heat dissipation function is considered.
Example two:
the embodiment provides a single-phase voltage stability monitoring alarm device, and the device comprises the single-phase voltage stability monitoring alarm circuit provided by the embodiment I. As shown in fig. 7, the single-phase voltage stability monitoring alarm circuit of the present embodiment is disposed on a circuit board, the circuit board is disposed in a heat dissipation cover 5, and a plurality of strip-shaped heat dissipation holes are disposed on a side surface of the heat dissipation cover. The body of the heat dissipation cover 5 can be made of 304 stainless steel, and the size of the strip heat dissipation holes 51 can prevent fingers or other medium-sized foreign objects from entering, and meanwhile, the heat dissipation function is considered.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A single-phase voltage stability monitoring alarm circuit, characterized by, includes: the voltage detection circuit comprises a rectification filter circuit, a first voltage detection circuit, a second voltage detection circuit and an abnormal voltage alarm circuit;
the rectification sampling circuit is used for carrying out rectification filtering processing on input single-phase alternating current to obtain a direct-current voltage signal;
the first voltage detection circuit is used for detecting whether the direct-current voltage signal is lower than a first preset reference voltage or not, and outputting a boosting trigger signal if the direct-current voltage signal is lower than the first preset reference voltage;
the second voltage detection circuit is used for detecting whether the direct-current voltage signal is higher than a second preset reference voltage or not, and outputting a voltage reduction trigger signal if the direct-current voltage signal is higher than the second preset reference voltage;
the abnormal voltage alarm circuit is used for detecting whether the direct current voltage signal is lower than a preset undervoltage alarm voltage or higher than a preset high-voltage alarm voltage, and if so, outputting an abnormal alarm trigger signal.
2. The single-phase voltage stabilization monitoring alarm circuit of claim 1, wherein the rectification sampling circuit comprises a first isolation transformer, a first rectification circuit and a filter circuit;
the first isolation transformer is used for carrying out safety isolation processing on input single-phase alternating current, and the first rectifying circuit is used for rectifying the single-phase alternating current output by the first isolation transformer to obtain an initial direct-current voltage signal; the filter circuit is used for filtering the initial direct current voltage signal and removing the alternating current voltage signal to obtain the direct current voltage signal.
3. The single-phase voltage stabilization monitoring alarm circuit of claim 1, wherein the first voltage detection circuit comprises: a first comparator, a first transistor, and a first relay;
the positive input end of the first comparator is used for inputting a first preset reference voltage, and the negative input end of the first comparator is used for inputting the direct-current voltage signal; the output end of the first comparator is connected with the control electrode of the first transistor, the first electrode of the first transistor is connected with preset conduction voltage, the second electrode of the first transistor is connected with the input end of the first relay, and the output end of the first relay is used for outputting the boosting trigger signal.
4. The single-phase voltage stabilization monitoring alarm circuit of claim 3, wherein the first voltage detection circuit further comprises a first resistor and a first adjustable resistor;
one end of the first resistor is connected with the output end of the rectification sampling circuit, the other end of the first resistor is connected with one end of the first adjustable resistor, and the other end of the first adjustable resistor is grounded; the other end of the first resistor is connected with one input end of the first comparator and used for inputting the direct current signal; and the voltage output end of the first adjustable resistor is connected with the input end of the other end of the first comparator and used for inputting the first preset reference voltage.
5. The single-phase voltage stabilization monitoring alarm circuit of claim 4, wherein the second voltage detection circuit comprises: a second comparator, a second transistor, and a second relay;
the positive input end of the second comparator is used for inputting a second preset reference voltage, and the negative input end of the second comparator is used for inputting the direct-current voltage signal; the output end of the second comparator is connected with the control electrode of the second transistor, the first electrode of the second transistor is connected with preset conduction voltage, the second electrode of the second transistor is connected with the input end of the second relay, and the output end of the second relay is used for outputting the voltage reduction trigger signal.
6. The single-phase voltage stabilization monitoring and alarming circuit as claimed in claim 5, further comprising a second adjustable resistor, one end of the second adjustable resistor is connected with the other end of the first resistor, and the other end of the second adjustable resistor is grounded; and the voltage output end of the second adjustable resistor is connected with the positive input end of the second comparator and used for inputting the second preset reference voltage.
7. The single-phase voltage stabilization monitoring alarm circuit of claim 5, wherein the abnormal voltage alarm circuit comprises a third adjustable resistor, a fourth adjustable resistor, a fifth adjustable resistor, a third comparator, a fourth comparator, a fifth comparator, a third transistor, and a third relay;
the positive input end of the third comparator is used for inputting the direct-current voltage signal, the reverse input end of the third comparator is grounded, the output end of the third comparator is connected with one end of a third adjustable resistor, the other end of the third adjustable resistor is grounded, and the output end of the third adjustable resistor is connected with the positive input end of the fourth comparator; one end of the fourth adjustable resistor is connected with the direct-current voltage signal, the other end of the fourth adjustable resistor is grounded, the output end of the fourth adjustable resistor is connected with the inverting input end of the fourth comparator, the output end of the fourth comparator is connected with the control electrode of the third transistor, the first electrode of the third transistor is connected with preset on-state voltage, and the second electrode of the third transistor is connected with the input end of the third relay; the output end of the third relay is used for outputting the abnormal alarm signal;
one end of the fifth adjustable resistor is connected with the direct-current voltage signal, the other end of the fifth adjustable resistor is grounded, the output end of the fifth adjustable resistor is connected with the positive input end of the fifth comparator, the negative input end of the fifth comparator is connected with the direct-current voltage signal, and the output end of the fifth comparator is connected with the control electrode of the third transistor.
8. The single-phase voltage stability monitoring alarm circuit of claim 1, further comprising a second isolation transformer, a second rectification circuit;
the second isolation transformer is used for carrying out safety isolation processing on the input single-phase alternating current, and the second rectifying circuit is used for rectifying the single-phase alternating current output by the second isolation transformer to obtain a direct-current voltage signal.
9. The single-phase voltage stabilization monitoring alarm circuit of claim 7, further comprising a first diode and a second diode; the anode of the first diode is connected with the output end of the fourth comparator, and the cathode of the first diode is connected with the control electrode of the third transistor; the anode of the second diode is connected to the output terminal of the fifth comparator, and the cathode of the second diode is also connected to the control electrode of the third transistor.
10. A single-phase voltage stability monitoring alarm device, characterized by comprising a single-phase voltage stability monitoring alarm circuit according to any one of claims 1 to 9.
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| CN202110231467.7A CN112946350A (en) | 2021-03-02 | 2021-03-02 | Single-phase voltage stability monitoring alarm circuit and device |
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| CN202110231467.7A CN112946350A (en) | 2021-03-02 | 2021-03-02 | Single-phase voltage stability monitoring alarm circuit and device |
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Application publication date: 20210611 |