CN102761095A - Device and method for undervoltage-overvoltage protection - Google Patents
Device and method for undervoltage-overvoltage protection Download PDFInfo
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Abstract
The invention provides a device and a method for undervoltage-overvoltage protection. The device comprises a single trip coil (210), a detection circuit (220) and a driving device (230), wherein the single trip coil is serially connected onto a power supply circuit and used for executing tripping action when large current is obtained, the detection circuit is used for generating undervoltage-overvoltage protection trigger signals when circuit voltage is detected to be lower than a first predetermined threshold value or higher than a second predetermined threshold value, and the driving device is used for responding to the undervoltage-overvoltage protection trigger signals to enable the trip coil to obtain the large current so as to drive the trip coil to execute the tripping action. By the device for the undervoltage-overvoltage protection, undervoltage-overvoltage double protection can be realized only by one trip coil.
Description
Technical Field
The invention relates to an undervoltage-overvoltage protection device and a method, in particular to a device and a method for undervoltage and overvoltage double protection by using a single trip coil.
Background
In general, the voltage on the power supply line is not a constant value, which may fluctuate accordingly due to changes in the load. Such voltage fluctuations (e.g., undervoltage or overvoltage) on the power supply line, if exceeding the tolerable range of the consumer, may adversely affect or even cause damage to the consumer. Therefore, under-voltage protection and over-voltage protection devices are usually used to ensure that the electrical equipment operates in a normal power supply state.
Under-voltage protection generally refers to a protection device that automatically shuts down a power supply line when the line voltage falls below a predetermined threshold (e.g., below 80% of nominal voltage), and that can be manually restored to the on state again by the time the line voltage returns to the normal range. In contrast, overvoltage protection means that when the line voltage exceeds a predetermined value (for example, 10% above the nominal voltage), the protection device also automatically disconnects the line and can be manually restored when the line voltage returns to normal in order to prevent damage to the consumer.
The undervoltage-overvoltage protection device in the current market mainly adopts 2 discrete trip coils to respectively realize the detection and the protection action of undervoltage and overvoltage. Fig. 1 schematically illustrates a conventional undervoltage-overvoltage protection device 100. As shown in fig. 1, the power supply lines L (live line) and N (neutral line) are used to supply power to the consumer 150. The protection device 100 is disposed at the consumer side and includes two trip coils 110 and 120. The two trip coils are respectively used for executing tripping action when undervoltage or overvoltage is detected. The tripping action of the trip coils 110 and 120 in turn mechanically drives the circuit breaker 130 to break the electrical connection of the power supply line to the electrical consumer 150.
Specifically, in fig. 1, both ends of the trip coil 110 are connected to the lines L and N. When the line voltage V is below a predetermined threshold Vmin (i.e. undervoltage), the push rod in the trip coil 110 is in position 2, i.e. tripped state, and thus causes the circuit breakers 130 on lines L and N to break the supply connection. When the line voltage V reaches the normal range, the push rod in the trip coil 110 is shifted from position 2 to position 1, so that the circuit breaker 130 is closed and the line is conductive. The trip coil 120 is connected to the power supply lines L and N via an overvoltage detection circuit 140. When the overvoltage detection circuit 140 detects that the line voltage V is normal, the push rod in the trip coil 120 is at position 1, so that the circuit breaker 130 is closed and the power supply line is turned on. When the overvoltage detection circuit 140 detects that the line voltage V exceeds a predetermined threshold Vmax, it outputs an overvoltage protection trigger signal, causing the push rod in the trip coil 120 to shift from position 1 to position 2, i.e., to enter a tripped state, which in turn causes the circuit breakers 130 on lines L and N to disconnect the supply.
The structure shown in figure 1 can realize undervoltage and overvoltage double protection. However, as can be seen from fig. 1, such an under-voltage/over-voltage protection device needs two independent trip coils to implement under-voltage protection and over-voltage protection, respectively. Each trip coil is relatively bulky and costly due to its mechanical structure, especially when compared to electronic components. This drawback obviously cannot meet the requirement of miniaturization and low cost of the current protection device. Therefore, further improvement is needed for the existing under-voltage and over-voltage protection device.
Disclosure of Invention
The invention aims to provide an under-voltage and over-voltage protection device and method using a single trip coil. The undervoltage-overvoltage protection device is obviously superior to the existing undervoltage-overvoltage protection device with double trip coils in volume and cost because only one trip coil is included.
According to one aspect of the invention, an undervoltage-overvoltage protection device comprises: a single trip coil connected in series on the power supply line for performing a trip action when a large current is obtained; the detection circuit is used for generating an under-voltage-over-voltage protection trigger signal when detecting that the line voltage is lower than a first preset threshold value or higher than a second preset threshold value; and the driving device is used for responding to the undervoltage-overvoltage protection trigger signal, so that the trip coil obtains a large current, and the trip coil is driven to execute a tripping action. The undervoltage-overvoltage protection device can realize undervoltage-overvoltage double protection only through one trip coil.
In one embodiment of the present invention, the driving device for driving the trip coil in the protection device may be a switching device connected in parallel to a load connected in series with the trip coil, and the switching device is closed in response to the undervoltage-overvoltage protection trigger signal, i.e., short-circuits the load so that the trip coil gets a large current. Preferably, the switching means comprises a transistor, a field effect transistor, a thyristor, a valve or a relay, or the like. The tripping coil can conveniently obtain large current by short-circuiting and load shedding of the switching device, and the circuit is simple and easy to realize. More preferably, the detection circuit is a load connected in series with the trip coil.
In an embodiment of the present invention, the detection circuit in the protection device may include two parts, namely an overvoltage detection circuit AND an undervoltage detection circuit, AND the undervoltage-overvoltage protection trigger signal is obtained after performing AND (AND) operation on the detection results of the overvoltage detection circuit AND the undervoltage detection circuit. Alternatively, the undervoltage and overvoltage detection circuits may also be integrated together to be implemented by a single chip. Preferably, the over-voltage and under-voltage detection circuit is implemented by a comparator, or the and logic operation is implemented by a wired-and manner.
In another embodiment of the present invention, the detection circuit in the protection device may further include a verification circuit for outputting the under-voltage-over-voltage protection trigger signal when it is verified that the and logic operation result is greater than a third predetermined threshold. Optionally, the detection circuit further includes a delay circuit, configured to delay the and logic result. The use of a delay and verification circuit can avoid short-time interference, thereby ensuring that the protection device is more reliable.
In another embodiment of the present invention, the protection device further includes a residual current protection circuit, which is configured to output a leakage protection trigger signal when the occurrence of the leakage phenomenon is detected, and the driving device further responds to the leakage protection trigger signal to make the trip coil obtain a large current, so that the trip coil performs a trip action. Therefore, the residual current protection circuit is integrated into the undervoltage and overvoltage protection circuit, and the triple functions of undervoltage, overvoltage and leakage protection are realized by only using a single trip coil.
According to another aspect of the invention, a method for performing under-voltage-over-voltage protection is also provided. The method comprises the following steps: using a single trip coil, the trip coil being connected in series on a power supply line and performing a trip action when a large current is obtained; generating an under-voltage-over-voltage protection trigger signal when the line voltage is detected to be lower than a first preset threshold value or higher than a second preset threshold value; and responding to the undervoltage-overvoltage protection trigger signal to enable the trip coil to obtain large current, so that the trip coil is caused to execute tripping action. Therefore, by adopting the method provided by the invention, the undervoltage and overvoltage double protection can be realized through a single trip coil, so that the volume of the product is reduced, and the cost is reduced.
Preferably, the method further comprises generating a leakage protection trigger signal when the occurrence of the leakage phenomenon is detected; and responding to the leakage protection trigger signal to enable the trip coil to obtain large current, so that the trip coil executes tripping action. Thus, the method provided by the invention can realize undervoltage and overvoltage protection and integrate leakage protection, namely undervoltage, overvoltage and leakage protection are realized by a single trip coil. This further reduces product volume and cost.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 shows a schematic diagram of a prior art undervoltage-overvoltage protection device;
fig. 2 schematically shows a structural view of an undervoltage-overvoltage protection device according to an embodiment of the present invention;
FIG. 3 illustrates a circuit schematic of an undervoltage-overvoltage protection device according to one embodiment of the present invention;
fig. 4 shows a circuit schematic of an undervoltage-overvoltage protection device according to yet another embodiment of the invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Fig. 2 schematically illustrates a schematic diagram of an undervoltage-overvoltage protection device 200 according to an embodiment of the invention. As shown in fig. 2, the protection device 200 according to an embodiment of the present invention includes a single trip coil 210, a detection circuit 220, and a driving device 230. Only one trip coil 210 is used in the protection device 200 to drive the circuit breakers 130 (e.g., miniature circuit breakers MCCB) on the lines L and N in a mechanical transmission to make or break the supply connections. The detection circuit 220 monitors whether a voltage under-voltage or an voltage over-voltage occurs on the circuit, and upon detecting the voltage under-voltage or the voltage over-voltage, it sends a protection trigger signal to the driving device 230. In response to the protection trigger signal, the driving device 230 causes the trip coil 210 to trip due to a large current, and thus causes the circuit breaker 130 to disconnect the power supply. In this way, in the present invention, no matter the detection circuit 220 detects undervoltage or overvoltage, the driving device triggers only one trip coil to realize the protection action. With the protection device 200 shown in fig. 2, the dual functions of under-voltage and over-voltage protection can be realized only by a single trip coil 210, so that the size and cost of the protection device 200 are reduced, and the current miniaturization requirement can be met.
In fig. 2, the detection circuit 220 and the driving device 230 can be implemented in various ways. For example, the driving device 230 may be a switching device connected in parallel to a load connected in series with the trip coil 210. In a preferred simple embodiment, the detection circuit is a load in series with the trip coil 210. It will be appreciated by those skilled in the art that the load may comprise other forms, for example it may alternatively comprise a resistor R0 (as shown in figure 3) in parallel with the detection circuit. The switching device may be closed in response to a protection trigger signal of the detection circuit 220, that is, the trip coil 210 may be driven to perform a trip action by drawing a large current through the detection circuit as a load by short-circuiting it. Alternatively, the driving device 230 may be implemented by other circuits, such as discharging a capacitor to make the trip coil 210 obtain a large current, and so on.
Similarly, the detection circuit 220 can be implemented in various ways, for example, the detection circuit can include two parts, namely an over-voltage detection circuit and an under-voltage detection circuit, and the detection of under-voltage and over-voltage can also be implemented by a single integrated chip. Furthermore, the undervoltage or overvoltage detection circuit itself may be implemented as a comparator, e.g. consisting of an op-amp, or may be implemented using a commercially available voltage detection chip, or even using an analog comparator circuit as known in the art.
Fig. 3 shows a circuit diagram of an undervoltage-overvoltage protection device 300 according to an embodiment of the invention. In the protection device 300, the trip coil 210 is connected in series to the power supply line. The drive means is implemented as a switching means, such as a thyristor 330. The detection circuit 320 includes two comparators, each of which is composed of an operational amplifier U1 and U2, for implementing an under-voltage (322) and an over-voltage detection (321), respectively. The undervoltage and overvoltage detection result is the undervoltage-overvoltage protection trigger signal at point B to trigger the thyristor 330.
Specifically, in fig. 3, the trip coil 210 is a high voltage coil that can perform the trip action when the operating voltage is greater than 50V, for example. In fig. 3, the trip coil 210 is connected in series to the line L, for example, before the rectifier circuit. The rectified line voltage V1 is applied to the sensing circuit 320 and the thyristor 330, whereby the sensing circuit 320 can be considered as a load in series with the trip coil, and the sensing circuit and resistor R0 are both in parallel with the thyristor.
As shown in fig. 3, line voltage V1 is applied to a series branch of resistor R10 and parallel capacitor C4 and zener diode D1 in one branch to provide a stable power supply at point a for each of the operational amplifiers U1-U3. Meanwhile, the voltage at the point a is also applied to the series branch of the resistors R7, R8 and R4, and stable reference voltages Vmin and Vmax are provided for the operational amplifiers U1 and U2 at the point a1 and the point a2, respectively.
In the other branch, the line voltage V1 is applied to the resistor R11 and the series branch formed by R3 and the capacitor C1 in parallel, and the divided line voltage V2 is obtained at the capacitor C1. The line voltage V2 is fed as a detected line voltage to the inputs of two op-amps U1 and U2, respectively. The operational amplifier U1 is used as a comparator for overvoltage detection (321), and when the voltage V2 is greater than Vmax, i.e., overvoltage occurs, the U1 outputs a high level and conversely outputs a low level. The operational amplifier U2 is used as a comparator for undervoltage detection (322), and when the voltage V2 is less than Vmin, i.e. undervoltage occurs, U2 outputs a high level.
The results output by U1 and U2 are wired-AND at point B. That is, when the detection result of any one of U1 and U2 is high, the point B voltage is high. In other words, point B is high whether under-voltage or over-voltage is detected. Only the simplest lines and logic are provided here. The AND operation can be performed on the results output by U1 and U2 via logic circuits such as AND gates according to actual needs. The result of the AND operation may directly drive the thyristor 330 as a protection trigger signal. If the point B is high (undervoltage or overvoltage occurs), the thyristor 330 is turned on, and the entire detection circuit 320 as a load is short-circuited, whereby the trip coil 210 is tripped by taking a large current, which causes the circuit breaker 130 to disconnect the power supply. On the contrary, if the point B is low (no undervoltage or overvoltage occurs), the thyristor 330 is turned off, the trip coil 210 operates normally, and the line is turned on.
In order to avoid malfunction due to disturbance, a delay circuit 325 and a verification circuit 327 are also preferably provided in the example shown in fig. 3. The delay circuit 325 is composed of a resistor R5 and a capacitor C2, and the delay time may be set to several tens to several hundreds of milliseconds as necessary. The delayed signal Vb is fed to a verification circuit 327. In the verification circuit 327, the U3 compares the delayed signal Vb with a reference voltage Vref (which is obtained by dividing resistors R9 and R6). If the comparison result of U3 shows that Vb is greater than Vref, it is proved that under-voltage or over-voltage does occur, and U3 outputs a high level as a protection trigger signal, and the high level can also drive the thyristor 330. In addition, in the example shown in fig. 3, it is further preferable to include a filter circuit at the output of U3, which is formed by R13, C3 and R14, to eliminate high frequency variations in the protection trigger signal to prevent malfunction.
In the example shown in fig. 3, the switching device 330 is implemented using a thyristor. However, it will be appreciated by those skilled in the art that the switching means may also be implemented using, for example, field effect transistors, valves, relays, and the like. Also, the under and over voltage detection circuit shown in fig. 3 can be implemented with other comparison circuits such as analog components instead of the operational amplifier.
Fig. 4 schematically shows a circuit diagram of an undervoltage-overvoltage protection device 400 with leakage protection according to another embodiment of the present invention. As shown in fig. 4, the under-voltage over-voltage protection device 400 is different from the protection device 300 shown in fig. 3 in that a residual current protection circuit 450 is added. As shown in fig. 4, the residual current protection circuit 450 outputs a high level to the output D of U3 once it detects the leakage phenomenon, and the output of U3 is performed as an and operation. That is, whether under-voltage or over-voltage is detected, once leakage is detected, the thyristor 330 is triggered to conduct, so that the trip coil 210 trips due to the large current, and the circuit breaker 130 is further caused to break the circuit connection.
Fig. 4 shows only one example of a residual current protection circuit 450. The circuit 450 includes a leakage detector 451 and a control chip 455. The leakage transformer 451 feeds the detected leakage current to pins 1-2 of the control chip 455. The control chip 455 determines the input leakage current. Once the control chip 455 determines that the leakage phenomenon occurs, it outputs a leakage protection trigger signal to the output terminal of U3 at pin 7 to drive the scr to perform corresponding operations. The structure of the residual current protection circuit herein is merely an example. Those skilled in the art can integrate other residual current protection circuits into the under-voltage-over-voltage protection circuit according to the present invention according to the requirements of practical application. In addition, the output of the residual current protection circuit may be added at point B to drive the thyristor 330 after verification via U3.
Fig. 2-4 illustrate the structure of the proposed undervoltage-overvoltage protection device 200, 300, 400 according to an embodiment of the present invention. The above-mentioned device is basically formed according to the design idea of using a single trip coil, connected in series on the power supply line, which performs the tripping action when a large current is drawn; generating an under-voltage-over-voltage protection trigger signal when the line voltage is detected to be lower than a first preset threshold value or exceed a second preset threshold value; and responding to the undervoltage-overvoltage protection trigger signal, and prompting the trip coil to obtain large current so as to cause the trip coil to execute tripping action. The design idea provided by the invention can ensure that under-voltage and over-voltage dual protection can be realized under the condition of only being suitable for a single trip coil, so that the design idea can reduce the volume of the under-voltage-over-voltage protection device and is suitable for the current miniaturization requirement. Meanwhile, the design idea is simple and convenient to realize and can be realized only by using low-cost electronic elements, so that the volume is reduced, and the equipment cost is also reduced.
Preferably, the design idea further includes generating a leakage protection trigger signal when the occurrence of the leakage phenomenon is detected; and responding to the leakage protection trigger signal to enable the trip coil to obtain large current, so that the trip coil executes tripping action. Therefore, the design idea provided by the invention can realize undervoltage and overvoltage protection and integrate leakage protection, namely undervoltage, overvoltage and leakage protection are realized by a single trip coil. This further reduces product volume and cost.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (15)
1. An undervoltage-overvoltage protection device, the device (200, 300, 400) comprising:
a single trip coil (210) connected in series on the power supply line for performing a trip action when a large current is obtained;
a detection circuit (220) for generating an under-voltage-over-voltage protection trigger signal upon detecting that the line voltage is below a first predetermined threshold or above a second predetermined threshold;
and the driving device (230) is used for responding to the undervoltage-overvoltage protection trigger signal to enable the trip coil to obtain large current so as to drive the trip coil to execute a tripping action.
2. The undervoltage-overvoltage protection device according to claim 1, wherein said driving device (230) is a switching device (330) connected in parallel to a load in series with said trip coil, and said switching device (330) is closed in response to said undervoltage-overvoltage protection trigger signal.
3. The undervoltage-overvoltage protection device according to claim 2, wherein the switching device (330) comprises any one of a transistor, a field effect transistor, a thyristor, a valve, and a relay.
4. The undervoltage-overvoltage protection device of claim 2, wherein said detection circuit (220) is connected as said load in series with said trip coil.
5. The undervoltage-overvoltage protection device as claimed in claim 1, wherein said detection circuit (320) comprises an overvoltage detection circuit (321) AND an undervoltage detection circuit (322), AND an AND logic circuit for AND-operating detection results of the overvoltage detection circuit AND the undervoltage detection circuit.
6. The undervoltage-overvoltage protection device of claim 5, wherein the overvoltage and undervoltage detection circuit includes a comparator (U1, U2).
7. The undervoltage-overvoltage protection device of claim 6, wherein the detection circuit (320) further comprises a verification circuit (327) for outputting the undervoltage-overvoltage protection trigger signal upon verifying that the signal output by the AND logic circuit is greater than a third predetermined threshold.
8. The undervoltage-overvoltage protection device according to claim 7, wherein said detection circuit (320) further comprises a delay circuit (325) for delaying a signal output by said and logic circuit.
9. The under-voltage-over-voltage protection device of claim 1, further comprising a residual current protection circuit (450) for outputting a leakage protection trigger signal when the occurrence of the leakage phenomenon is detected, and the driving device (230) further makes the trip coil (210) obtain a large current in response to the leakage protection trigger signal, so that the trip coil (210) performs a trip action.
10. The undervoltage-overvoltage protection device of claim 9, wherein the driving device (230) further drives the trip coil in response to an and operation result between the leakage protection trigger signal and the undervoltage-overvoltage protection trigger signal.
11. The undervoltage-overvoltage protection device of claim 1, wherein the trip coil (210) is a high voltage coil.
12. A method of performing under-voltage-over-voltage protection, comprising:
a single trip coil is used, the trip coil is connected in series on a power supply circuit, and the trip coil executes a trip action when obtaining a large current;
generating an under-voltage-over-voltage protection trigger signal when the line voltage is detected to be lower than a first preset threshold value or higher than a second preset threshold value;
and responding to the undervoltage-overvoltage protection trigger signal to enable the trip coil to obtain large current, so that the trip coil is caused to execute tripping action.
13. The method of claim 12, wherein the step of causing the trip coil to draw a high current comprises causing the trip coil to draw a high current by shorting out a load in series with the trip coil.
14. The method of claim 12, further comprising:
when the leakage phenomenon is detected, generating a leakage protection trigger signal;
the tripping coil (210) obtains a large current in response to the leakage protection trigger signal, so that the tripping coil (210) performs a tripping action.
15. The method of claim 14, wherein the undervoltage-overvoltage protection trigger signal and the leakage protection trigger signal perform an and operation, and the and operation result is used to drive the trip coil.
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| CN201110108523.4A CN102761095B (en) | 2011-04-28 | 2011-04-28 | Undervoltage-overvolprotection protection device and method |
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| CN201110108523.4A CN102761095B (en) | 2011-04-28 | 2011-04-28 | Undervoltage-overvolprotection protection device and method |
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| CN104078929A (en) * | 2013-03-29 | 2014-10-01 | 松下电器产业株式会社 | Breaker, undervoltage tripping device, and under/overvoltage tripping device |
| CN104577947A (en) * | 2013-10-21 | 2015-04-29 | 无锡华阳科技有限公司 | Overvoltage and undervoltage protection device with function of displaying overvoltage or undervoltage |
| CN105991101A (en) * | 2015-03-06 | 2016-10-05 | 展讯通信（上海）有限公司 | Power supply self-adaption operational amplifier |
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| CN104078928A (en) * | 2013-03-29 | 2014-10-01 | 松下电器产业株式会社 | Undervoltage tripping device of circuit breaker and over/undervoltage tripping device |
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| CN103326322A (en) * | 2013-06-14 | 2013-09-25 | 常熟市九洲电器设备有限公司 | Motor voltage protection and control circuit |
| CN104577947A (en) * | 2013-10-21 | 2015-04-29 | 无锡华阳科技有限公司 | Overvoltage and undervoltage protection device with function of displaying overvoltage or undervoltage |
| CN105991101A (en) * | 2015-03-06 | 2016-10-05 | 展讯通信（上海）有限公司 | Power supply self-adaption operational amplifier |
| CN105991101B (en) * | 2015-03-06 | 2019-07-23 | 展讯通信（上海）有限公司 | A kind of supply self adaptation operational amplifier |
| CN108155622A (en) * | 2018-01-24 | 2018-06-12 | 宁波大家小家网络科技有限公司 | A kind of overvoltage/undervoltage protective device for electric system |
| CN109193561A (en) * | 2018-09-30 | 2019-01-11 | 公牛集团股份有限公司 | A kind of integrated-type residual current action breaker |
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|---|---|
| CN102761095B (en) | 2015-09-23 |
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