Device and method for detecting mixed connection of null line and live line and emergency lighting system

Abstract

The invention discloses a zero line and live line mixed connection detection device, a zero line and live line mixed connection detection method and an emergency lighting system, and relates to the field of emergency lighting circuits. According to the comparison result of the voltage of the current output node of the current emergency lighting circuit and the reference voltage, whether null line and live line mixed connection occurs in the emergency lighting circuit is judged; a mixed connection correction module is utilized to adjust a current input node of a current emergency lighting circuit to a current output node and adjust the current output node to the current input node when mixed connection occurs. According to the application, whether the null line and live line mixed connection occurs in the emergency lighting circuit can be accurately judged according to the comparison result of the voltage of the current output node of the current emergency lighting circuit and the reference voltage, once the null line and live line mixed connection problem is found, correction is carried out in time, and normal work of the emergency lighting lamp is ensured.

Description

Technical Field

[0001] The present application relates to the field of emergency lighting circuits, and in particular, to a zero-fire wire mixed connection detection device, a detection method, and an emergency lighting system. Background Art

[0002] Semiconductor diodes (LEDs) have been widely used as a new generation of lighting sources. There is a special type of lamp in the market, namely, emergency lighting lamps. After the power supply of the mains power grid stops, these emergency lighting lamps can still provide emergency lighting for a period of time, which is of practical value for the vast majority of underdeveloped countries and regions in the world. Such emergency lighting lamps already existed in the era of energy-saving fluorescent lamps more than a decade ago. When the mains power grid is normally powered, it provides normal lighting and simultaneously charges the energy storage battery in the lamp; after the mains power grid stops power supply, it discharges through the energy storage battery to provide emergency lighting for a limited time. After entering the LED lighting era, with the significant reduction in the cost of the emergency lighting system (including the energy storage battery), emergency lighting lamps have been widely used in underdeveloped countries and regions. However, there has been a technical problem that has not been well solved, that is, when two or more emergency lighting lamps are simultaneously connected to the AC power grid and only controlled by one grid connection control switch, the AC input lines of the emergency lighting lamps are not allowed to be mixed. Once misconnected, one or more emergency lighting lamps will operate abnormally. Summary of the Invention

[0003] The purpose of the present application is to provide a zero-fire wire mixed connection detection device, a detection method, and an emergency lighting system, which can timely detect the problem of zero-fire wire mixed connection in the emergency lighting circuit and correct it in time.

[0004] To achieve the above purpose, the present application provides the following solutions:

[0005] In a first aspect, the present application provides a zero-fire wire mixed connection detection device, including: an identification and error correction logic module and a mixed connection correction module;

[0006] The input end of the identification and error correction logic module is electrically connected to the current input node and the current output node of the emergency lighting circuit; the output end of the identification and error correction logic module is electrically connected to the mixed connection correction module; in the case of no zero-fire wire mixing, the current input node and the current output node of the emergency lighting circuit are respectively connected to the live wire and the neutral wire of the AC power grid through isolation resistors in one-to-one correspondence;

[0007] The recognition and error correction logic module, when the grid access control switch is in the off state, determines whether there is a zero-fire wire connection mix in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage, and when there is a zero-fire wire connection mix, outputs an error correction instruction to the connection mix correction module; the reference voltage is determined according to the current output by the current source in the emergency lighting circuit;

[0008] The connection mix correction module is arranged at the current input node and the current output node of the emergency lighting circuit, and is used to adjust the current input node of the current emergency lighting circuit to the current output node and adjust the current output node to the current input node according to the error correction instruction output by the recognition and error correction logic module.

[0009] In a second aspect, the present application provides a connection mix detection method implemented based on the above zero-fire wire connection mix detection device, including:

[0010] Judge whether the emergency lighting fixture is powered by an AC grid to obtain a first judgment result;

[0011] If the first judgment result is negative, judge whether the grid access control switch in the emergency lighting circuit is in the closed state to obtain a second judgment result;

[0012] If the second judgment result is positive, then judge whether there is a zero-fire wire connection mix in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage to obtain a third judgment result; the reference voltage is determined according to the current output by the current source in the emergency lighting circuit;

[0013] If the third judgment result is positive, then adjust the current input node of the current emergency lighting circuit to the current output node and adjust the current output node to the current input node.

[0014] In a third aspect, the present application provides an emergency lighting system, including: an emergency lighting fixture and a detection device for detecting and correcting the zero-fire wire connection mix of the emergency lighting lamp; the detection device adopts the above zero-fire wire connection mix detection device.

[0015] According to the specific embodiments provided by the present application, the following technical effects are disclosed in the present application:

[0016] The present application provides a zero - line and live - line mixed connection detection device, a detection method and an emergency lighting system. By using an identification and error - correction logic module, when the grid access control switch is in the off state, it determines whether there is a zero - line and live - line mixed connection in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage. And when there is a zero - line and live - line mixed connection, it outputs an error - correction instruction to the mixed - connection correction module. By using the mixed - connection correction module, according to the error - correction instruction output by the identification and error - correction logic module, it adjusts the current input node of the current emergency lighting circuit to the current output node and adjusts the current output node to the current input node. In the present application, it can accurately determine whether there is a zero - line and live - line mixed connection in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage. Once it is found that there is a zero - line and live - line mixed connection problem, it can be corrected in time. On the one hand, it can accurately detect the zero - line and live - line mixed connection problem, and on the other hand, it can effectively correct the mixed connection in time, ensuring the normal operation of the emergency lighting lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. is a simplified schematic diagram of a typical emergency lighting system provided by an embodiment of the present application;

[0019] Figure 2 FIG. is a schematic diagram of the correct way to connect two emergency lighting lamps to the power grid provided by an embodiment of the present application;

[0020] Figure 3 FIG. is a schematic diagram of the incorrect way to connect to the power grid provided by an embodiment of the present application;

[0021] Figure 4 FIG. is a waveform diagram of the two power grid input lines of the emergency lighting lamp when the control switch is off and on provided by an embodiment of the present application;

[0022] Figure 5 FIG. is a schematic diagram of the current distribution of two emergency lighting circuits in the case of mixed connection provided by an embodiment of the present application;

[0023] Figure 6 FIG. is a structural schematic diagram of a circuit (including a zero - line and live - line mixed connection detection device) that supports zero - line and live - line mixed connection provided by an embodiment of the present application;

[0024] Figure 7Schematic diagram of the recognition and error correction logic module provided by an embodiment of the present application;

[0025] Figure 8 Flow schematic diagram of a connection detection method implemented based on the zero - line and live - line connection detection device provided by an embodiment of the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0028] Next, the process of the present application for accurately determining whether there is a zero - line and live - line connection in the emergency lighting circuit by discovering the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage will be introduced:

[0029] Taking Figure 1 a simplified schematic diagram of a typical emergency lighting system as an example. It should be noted that due to the diversity of actual applications, Figure 1 the reference ground of the detection circuit 100 is not directly connected to the output ground of the rectifier 120. It can be seen that the connection of the emergency lighting system to the left side of the grid access control switch 110 has a specific function: the detection current output line of the grid and the switch, simply referred to as the read current output line; and the connection of the emergency lighting system to the grid neutral line N also has a specific function: the detection current input line of the grid and the switch, simply referred to as the read current input line. In the power - off state of the grid, the read currents of the read current input line and the read current output line are used to read the state of the control switch 110: if there is a read current flowing out from the AC1 node and at the same time a read current of the same magnitude also flows into the AC2 node, the judgment logic circuit 105 considers that the control switch 110 is in the closed state, and then starts the emergency light source to provide emergency lighting; if it is detected that there is no read current flowing out from the AC1 node and at the same time no read current flowing into the AC2 node is detected, the judgment logic circuit 105 considers that the control switch 110 is in the open state, and then turns off the emergency light source. When the control switch 110 is turned on in the power - off state of the grid, the voltages of the two nodes AC1 and AC2 are key parameters, as shown in formulas (1) and (2). The judgment logic circuit 105 makes a decision based on the magnitudes of the voltages of these two nodes. Assuming that the output resistance 104 of the current source 103 is very large, its influence on the magnitude of the output current can be ignored, R ACIt is the DC resistance between the live wire and the neutral wire of the power grid after a power outage, and the resistance value is generally from zero to several hundred k ohms.

[0030] V AC2 = I R * R 106 (1)

[0031] V AC1 = I R *(R 101 + R AC + R 102 + R 106 ) ≥ I R *(R 101 + R 102 + R 106 ) (2)

[0032] However, there has been a technical problem that has not been well solved. That is, when two or more emergency lighting fixtures are connected to the AC power grid at the same time and are controlled only by one control switch 110, the two AC input lines of the emergency lighting fixtures are not allowed to be connected in a wrong way. Once wrongly connected, one or more emergency lighting fixtures will work abnormally. Figure 2 is the correct way to connect two emergency lighting fixtures to the power grid; Figure 3 is the wrong way to connect to the power grid.

[0033] In the correctly connected Figure 2 , the read current output lines of the two emergency lighting fixtures are connected together and then commonly connected to the left side of the control switch 110; the read current input lines of the two emergency lighting fixtures are connected together and then commonly connected to the neutral wire of the power grid. In the power-off state of the power grid, when the control switch 110 is disconnected, the read currents of the two emergency lighting fixtures cannot flow out or flow in, and both systems can correctly detect that the control switch 110 is in the disconnected state; when the control switch 110 is closed, the read currents of the two emergency lighting fixtures can both flow out and flow in, and both systems can correctly detect that the control switch 110 is in the closed state. The voltages of the two important nodes AC1, AC2 and AC1A, AC2A inside the two systems are also expressed by formulas (1) and (2) respectively. It should be noted here that unless otherwise specified, the voltages of the four nodes AC1, AC2 and AC1A, AC2A are all from the perspective of their respective small systems, and will not be repeated in the following text. To distinguish the two systems, in the second system, the label of each structure is added with "A" for distinction.

[0034] In the wrongly connected (mixed connection) Figure 3There are also only two small systems. The read current output line of the first system is connected to the read current input line of the second system, and then they are jointly connected to the left side of the grid connection control switch 110; the read current input line of the first system is connected to the read current output line of the second system, and then they are jointly connected to the neutral line of the grid. Assume that the read currents of the two systems are equal, that is, I R1 = I R2 . When the grid connection control switch 110 is disconnected, the read current I R1 of the first system can flow out, pass through the read current input line of the second system, and then flow into the negative electrode of the energy storage battery 130A of the second system; similarly, the read current I R2 of the second system can also flow out, pass through the read current input line of the first system, and then flow into the negative electrode of the energy storage battery 130 of the first system. If the parameters inside the two systems are completely the same and they are all ideal devices, then the voltages of the two important nodes AC1, AC2 and AC1A, AC2A inside the two systems are respectively expressed by the following formulas (3) and (4). 'Mix' specifically refers to incorrect misconnection. Here, it is assumed that the output resistance 104 of the current source 103 has a sufficiently large resistance value, and its influence on the output current magnitude can be ignored:

[0035] V MixAC2 = I R1 *R 106 = V MixAC1A = I R2 *R 106A (3)

[0036] V MixAC1 = I R1 *(R 101 +R 102 +R 106 ) = V MixAC1A = I R2 *(R 101A +R 102A +R 106A ) (4)

[0037] It can be seen that even when the control switch 110 is in the off state, the respective judgment logic circuits 105 and 105A inside the two systems will erroneously judge that the control switch 110 is in the on state, so that the two systems erroneously turn on the emergency light sources. That is to say, when the control switch 110 is in the off state, Figure 3 the misconnection causes the control switch 110 to be unable to control the lighting and extinguishing of the lamps, and the emergency light sources of the two lamps are always on.

[0038] Therefore, different from most general AC grid devices, emergency lighting fixtures have certain particularities: during production, it is required to distinguish the two grid input lines with different colors; during customer installation, it is also required to strictly distinguish the AC grid wiring to ensure that the live wire and neutral wire are not mixed. However, all along, the market clients have been constantly making demands, and the core requirement is: can the requirement of not mixing the neutral wire and live wire be cancelled? The industrial community has been constantly striving to solve this problem.

[0039] In recent years, some emergency lighting products that support the mixing of the neutral wire and live wire have emerged on the market. For example, the invention patents with application numbers: CN201910837502, CN2021101675362, CN202411974685X (under application). The disclosed method is: at the moment when the switch is closed and turned on (CN201910837502), the internal detection circuit detects the phase information of the grid input line voltage (that is, determines which line of the two grid input lines has a higher voltage and which has a lower voltage), and determines Figure 1 which of the two nodes AC1 and AC2 in Figure 4As shown. That is to say, when the AC power grid is normally powered, this system will reassign which one is the read current output line and which one is the read current input line at the moment of turning on the light each time. The purpose is to keep the read current output lines and read current input lines of multiple (greater than or equal to 2) systems connected in parallel to the power grid consistent. The technologies mentioned in both CN2021101675362 and CN202411974685X detect the AC voltage phase difference between the zero line and the live line of the power grid at the moment when the switch 110 is disconnected. In essence, there is no difference from detecting at the moment when the control switch 110 is turned on. This theory seems feasible, but in fact, there are obvious defects. In actual use, this system has the following three problems: (1) When multiple systems are initially installed and connected to the power grid, when one or more systems have errors caused by incorrect connection, they cannot automatically correct the errors. Only when the power grid is normally powered and the switch 110 is turned on, can the read current output lines and read current input lines of multiple systems be redefined simultaneously. That is, after multiple systems are connected incorrectly, the errors cannot be corrected immediately; (2) After multiple systems are successfully connected in parallel to the AC power grid, each time the power grid is normally powered and the control switch 110 is turned on, the read current output lines and read current input lines of multiple systems will be forcibly reset, even if the entire system has worked successfully before; (3) Regarding problem (2), if turning on the control switch 110 each time when the power grid is normally powered can forcibly reset the system correctly 100%, it is also acceptable. But in fact, the probability of successful forced reset each time by this method is only about 90% or a little more, and it cannot reach 100%.

[0040] The global civilian power grid is an AC power grid, with the positive half-cycle voltage and the negative half-cycle voltage alternating, and the frequency is 50Hz or 60Hz. The fundamental reason for this theoretical defect is that at the moment when the switch 110 is turned on when the power grid is normally powered, it may be the highest point of the positive half-cycle, or the middle of the positive half-cycle, or the lowest point of the negative half-cycle, and of course, it may also be the middle of the negative half-cycle. The absolute voltage values at these sampling points are relatively large, and the possibility of detection error is very low; however, at the moment when the control switch 110 is turned on, it may also happen to be near the intersection point of the positive half-cycle voltage and the negative half-cycle voltage, that is, near 0. Some small systems may judge it as the positive half-cycle, while some small systems may judge it as the negative half-cycle. Therefore, the probability of detection failure here will increase significantly.

[0041] The above is the theoretical analysis, and the actual test data basically conforms to the theory. Generally speaking, the biggest problem with this theory is that every time the control switch 110 is turned on when the power grid is normally powered, the system will be forcibly reset. Although the success rate is between 96% and 99%, although the probability of successful setting each time is very high, the success rate of consecutive forced settings will drop rapidly. For example, assuming that the success rate of each setting is 98%, the success rate of 10 consecutive settings is less than 82%, the success rate of 20 consecutive settings is less than 67%, and the success rate of 30 consecutive settings is less than 55%. The probability of more than one failure rises significantly to 45%. In other words, in the actual usage scenario of this theory, errors are almost certain to occur when multiple systems are used in parallel, which will reduce the user experience of end customers. Objectively speaking, although this method has made useful explorations and practices in theory for solving the problem of zero-fire wire misconnection, there are still deficiencies, the problem has not been completely solved, and even some new problems have been introduced, which will not be discussed in detail here.

[0042] Therefore, the defects of CN201910837502, CN2021101675362, and CN202411974685X can be summarized as: making a distribution decision and executing it only in an instant, and then ignoring it regardless of the result being right or wrong. Just like a soldier shooting at a target, just pulling the trigger to fire, no one knows or cares whether the bullet hits the target. This leads to the situation that once a misdistribution occurs, there is no way to correct the error immediately, and one can only passively wait for the next power grid restoration to re-distribute, and so on in a cycle. This open-loop control method has no error correction mechanism and is a relatively primitive means.

[0043] In response to this, this application proposes a new theory and method for solving zero-fire wire misconnection. As mentioned before, in the case of incorrect misconnection Figure 3 , when the internal parameters of the two systems are exactly the same, a special equilibrium state is obtained. Formulas (3), (4), and (5) give the expressions of the main node voltages in this special state, and the voltages of two key nodes are equal, V MixAC1 = V MixAC1A , and V MixAC2 = V MixAC2A . Why is this equilibrium state special? Because there are no two completely identical systems in the world, just like there cannot be two completely identical fingerprints in the world. If there are differences in the parameters of the two systems, Figure 3 there will be different states.

[0044] To simplify the calculation, assume that the two systems are exactly the same in all other parameters except for the reading current. Assume that the reading current I R1 of the detection circuit 100 of the first system is slightly smaller, I R1 = I R - ID ; while the read current I of the detection circuit 100A of the second system R2 is slightly larger, I R2 = I R + I D . For the sake of simplifying the calculation, it is assumed that I R is much larger than I D . According to circuit theory, the current distribution of the entire system is as Figure 5 shown. From the perspectives of the respective judgment logic circuits 105 and 105A inside the two systems, the voltage of node AC2 is still equal to the voltage of node AC2A (Formula 5), but the voltage of node AC1 (Formula 6) decreases by I D *R 104 , while the voltage of node AC1A (Formula 7) increases by I D *R 104A . I D can be very small, for example, only 2nA, but the resistance value of R 104 can be very large, for example, up to 100M ohms, so that I D *R 104 = 0.2V, that is, the voltage of AC1 drops by 0.2V, and the voltage of node AC1A rises by 0.2V. If the resistance value of R 104 increases to 500M ohms, then I D *R 104 = 1V, that is to say, the voltage of AC1 drops by 1V, and the voltage of node AC1A rises by 1V. Assume that I R = 2uA, R 101 = R 102 = R 101A = R 102A = 200K, R 106 = R 106A = 50K, I D = 2nA, R 104 = R 104A = 500M, calculated from Formula (7), V AC1 = 0.9V - 1V = -0.1V; and V AC1A = 0.9V + 1V = 1.9V.

[0045] V MixAC2 = I R *R 106 = V MixAC2A = I R *R 106A (5)

[0046] V MixAC1 = I R *(R 101 + R 102 + R106 ) - I D *R 104 (6)

[0047] V MixAC1A =I R *(R 101A +R 102A +R 106A ) + I D *R 104A (7)

[0048] Equations (1) and (2) are the expressions for correctly connecting the read current flowing out of node AC1 (abbreviated as the out - flowing node) and flowing into node AC2 (abbreviated as the in - flowing node). Comparing with the equations (5), (6) and (7) of the wrong mixed - connection system, it can be found that whether it is a normal connection or a mixed connection, the voltage of the in - flowing node is the same, as shown in equations (1) and (5), without difference; while there are significant differences in the voltage of the output node of the mixed connection: V MixAC1 is less than that of the normal connection V AC1 , and the minimum difference is I D *R 104 . This difference can be zero at the minimum, or can be very large, such as up to 1V. Once the circuit recognizes this difference, can it be considered that the current system is a wrong mixed connection? The answer is yes, and this is also the theoretical basis of the present invention: for a correctly connected system, the output - node voltage within each small system must be greater than or equal to I R *(R 101 +R 102 +R 106 ); while for a system with wrong mixed connection, the output - node voltage within the smaller - read - current small system will be less than I R *(R 101 +R 102 +R 106 ). That is to say, if a comparator is used to judge the voltage of the output node, as long as it is greater than or equal to I R *(R 101 +R 102 +R 106 ), it can be judged that the system is correctly connected; on the contrary, as long as the voltage of the output node is less than I R *(R 101 +R 102 +R 106 ), it can be judged that the system has wrong mixed connection.

[0049] In order to ensure more accurate identification of the magnitude relationship between the output - node voltage and the reference voltage, the larger the output resistance of the internal current source 103 of the chip, the more beneficial it is, such as greater than 200 M ohms. Therefore, the output resistance of the current source 103 is greater than the preset resistance value.

[0050] With the judgment theory, a solution is available: each small system first judges the voltages of its respective read current output node and input node. If the startup conditions of the emergency light source are met, it then judges whether the voltage of the current output node is less than I R *(R 101 +R 102 +R 106 ). If the result is no, the current circuit configuration is maintained; if the result is yes, the current output node is changed to the input node, and at the same time the current input node is changed to the output node. The closing of the grid access control switch 110 is one of the startup conditions of the emergency light source, but not the only condition. In the case where the grid access control switch 110 is disconnected, the mixed connection of multiple systems may misjudge that the grid access control switch 110 is closed and start the emergency light source. Therefore, the mixed connection of multiple systems may also cause the emergency light sources of one or more small systems to start incorrectly.

[0051] With the solution, let's see how to implement it specifically. First, look at the most important judgment criterion I R *(R 101 +R 102 +R 106 ), which consists of four parameters: the read current I R is generated internally by the chip, and its magnitude is generally fixed, with an error of ±15%; the resistor 106 is generally placed inside the chip, with a fixed resistance value and an error of ±15%; and the resistors 101 and 102 are high-voltage isolation resistors. In some products, these two resistors are integrated inside the chip, with a fixed resistance value and an error of ±15%, but in most products, these two resistors are external, and the resistance value may be between 200K and 300K. Therefore, I R *(R 101 +R 102 +R 106 ) may have a certain deviation. To improve the accuracy of the judgment, the judgment criterion needs to have a certain redundancy. For example, the judgment criterion is set to K*I R *(R 101 +R 102 +R 106 ), and the proportionality coefficient K is less than 1, such as 0.8, or 0.7, or even smaller. With the redundancy of the judgment criterion, there are higher requirements for the magnitude of the difference I D *R 104 in formula (6), that is, the value of I D *R 104 must be large enough, for example, it is required to be greater than 0.3V. With contemporary semiconductor technology, it is not difficult to make the output resistance 104 of the current source inside the chip reach several hundred megohms. Taking R 104 = 300M, I D *R 104 > 0.3, we can solve for ID > 1 nA. This is equivalent to requiring that the read currents of the two hybrid systems only need to differ by 2*I D ≥ 2 nA or more, and then they can be correctly identified by the technical theory and method of this application. The typical value of the general read current is 2 μA, and 2 nA is only one-thousandth of it. It seems that, under ideal circumstances, the theory and method proposed in this application are effective. However, when the difference in the read currents of the two hybrid systems is less than 2 nA, that is, 2*I D < 2 nA, the theory and method of this application cannot correctly identify the wrong hybridization. The probability of identification failure is less than 0.4%, which seems to be not a big problem. However, the actual situation is not so simple. In the real world, the ideal situation does not exist.

[0052] The chip needs to be installed on the PCB together with other peripheral components. First, the PCB is not a completely insulating material. Second, the PCB may be slightly contaminated during production. Third, the working and storage environments may be humid and dusty. Due to these many reasons, the resistance value of the equivalent read current source output resistor 104 of the final product will decrease significantly. The maximum may be only a few dozen megohms, and the minimum may be only a few megohms, such as 3 megohms. Take R 104 = 3 M, I D *R 104 > 0.3 V, and it can be solved that I D > 0.1 μA. This is equivalent to requiring that the read currents of the two hybrid systems need to differ by 2*I D = 0.2 μA or more to be correctly identified by the theory and method of this application. When the difference in the read currents of the two hybrid systems is less than 0.2 μA, that is, 2*I D < 0.2 μA, the theory and method of this application cannot correctly identify the wrong hybridization. In this case, it is estimated that the probability of identification failure is as high as about 33%. Then: artificially increase the difference between the read currents of the two small systems. As mentioned above, the read current I R is generated inside the chip, with a fixed size, and the error generally exceeds ±15%. Then it is possible to artificially make the read current I R have a non-fixed size. For example, randomly select one as the read current from two or more options of different read current sizes (the difference between different options is more than 15%). The read current can not only be randomly selected, but also be reselected at an appropriate time (for example, the system will reselect the size of the read current every time it is in the AC working state) to ensure that the hybridization can be 100% identified finally. The read current source 103 is used to provide a stable read current, detect the grid switch state and make hybridization judgment. The central value of the read current sizes randomly generated inside each independent subsystem is about 2 μA. For the same subsystem, the difference between the output current sizes of two adjacent times is more than 10%.

[0053] The previous discussions were all based on the example of two small systems. In fact, the mixed connection of two small systems is the most difficult case in the theory of this application. For each small system, a read current random generation circuit is introduced. For the mixed connection composed of more than two small systems, it is relatively simpler. For each small system, a read current random generation circuit is introduced, and the theory of this application can achieve 100% correct recognition. Taking the composition of three small systems as an example, there are only two possible combinations: all the same, or two the same and one opposite. All the same means that all three small systems are connected in the same direction, and this situation does not require correction; two the same and one opposite means that two small systems are connected in the same direction, while the other small system is connected in the opposite direction. Using the theory of the present invention to analyze the situation of these three systems, for two the same and one opposite, the ratio of the read currents of the positive and negative (here taking the same side as positive) sides can be simply regarded as 2:1, that is, the read current on the negative side is only half of the read current on the positive side, and the read current on the negative side is 2 μA smaller than the read current on the positive and negative sides (assuming that the read currents of the three small systems are all 2 μA). Substituting into formula (6) (assuming that the output resistances of the read current sources of the three small systems are all very small, only 3 MΩ), I D *R 104 = 2 μA * 3 M = 6 V, that is, theoretically, the voltage of the read current output node on the negative side will drop by as much as 6 V. The theory of the present invention can completely and correctly recognize such a large voltage drop by 100%. It should be noted that the maximum voltage of a single lithium battery (energy storage battery 130) is only 4.2 V. The voltage of the read current output node on the negative side will be clamped and limited by two diodes. One is the chip substrate silicon diode clamped at around -0.5 V at the lowest, and the other is that the ACK node will be clamped by the diode at the lower left of the rectifier 120. Therefore, the actual voltage drop of the read current output node is far from reaching 6 V. For the situation composed of four small systems, it is also very simple. Since the small systems are connected to the power grid one after another, as long as the connection interval time is slightly longer than the time required for the recognition and correction of the mixed connection in the theory of the present invention (generally not exceeding one hundred milliseconds). And so on, for five, six, seven, and even infinitely many, the number of small systems connected is not limited. It can be seen that the mixed connection of two small systems is the most difficult case in the theory of the present invention. Improving the recognition and correction of the mixed connection of two small systems is the key.

[0054] Based on the above technical concept process, such as Figure 6 in the detection circuit 200, this application proposes a zero-fire wire mixed connection detection device, including: an identification and error correction logic module (i.e., Figure 6 the identification and error correction logic circuit 220 in

[0055] The input end of the recognition and error correction logic module is electrically connected to the first detection node (corresponding to the AC1 node) and the second detection node (AC2 node) of the emergency lighting circuit; the output end of the recognition and error correction logic module is electrically connected to the mixing correction module; the first detection node and the second detection node of the emergency lighting circuit are respectively connected to the live wire and the neutral wire of the AC power grid through isolation resistors in one-to-one correspondence. The first detection node may be a current input node or a current output node, and the second detection node may be a current input node or a current output node. Therefore, when the first detection node is a current input node, the second detection node is a current output node; when the first detection node is a current output node, the second detection node is a current input node.

[0056] If the AC power grid is in a power outage state and the control switch is in the closed state, all emergency lighting fixtures controlled by the control switch will correctly activate the emergency light source, and no abnormal situation will occur due to the mixing. Only when the control switch is in the open state, the mixing may cause an error, which can be recognized by the system and then corrected. Therefore, the recognition and error correction logic module is used to determine whether there is a zero-fire wire mixing in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage when the grid access control switch in the emergency lighting circuit is in the open state, and when there is a zero-fire wire mixing, output an error correction instruction to the mixing correction module; the reference voltage is determined according to the current output by the current source in the emergency lighting circuit.

[0057] The mixing correction module is arranged at the current input node and the current output node of the emergency lighting circuit, and is used to adjust the current input node of the current emergency lighting circuit to the current output node and adjust the current output node to the current input node according to the error correction instruction output by the recognition and error correction logic module.

[0058] The zero-fire wire mixing detection device proposed in this application is a closed-loop control with a built-in error correction mechanism, which can solve the three problems corresponding to the existing methods: (1) Once the mixing problem is found in this application, it can be corrected in time, and the time required does not exceed 500 milliseconds, without waiting for other conditions at all; (2) When multiple systems are mixed and connected in parallel to work, once the system configuration is stable, this application will no longer force the system to be reconfigured; (3) This application provides a complete solution to ensure that the system can be configured successfully by 100% when mixed and connected in parallel.

[0059] In another exemplary embodiment of this application, in order to increase the difference between the read currents of the two small systems, so as to more accurately identify the zero-fire wire mixing situation, as Figure 6 shown, the zero-fire wire mixing detection device further includes: a current random generation module (i.e., Figure 6 the read current random generation circuit 210 in

[0060] The current random generation module is electrically connected to the identification and error correction logic module, and is used to control the current source in the emergency lighting circuit to randomly generate an output current; the reference voltage dynamically changes with the current randomly output by the current source in the emergency lighting circuit. The calculation formula of the reference voltage is:

[0061] V REF = K * I R *(R 101 + R 102 + R 106 )

[0062] Wherein, V REF represents the reference voltage; I R represents the latest output current randomly generated by the current source in the emergency lighting circuit, that is, the output current randomly generated by the current source during the most recent grid power supply; R 101 and R 102 represent the isolation resistances between the first detection node and the second detection node of the emergency lighting circuit and the live wire and the neutral wire of the AC power grid; R 106 represents the current detection resistance between the current input node of the current emergency lighting circuit and the negative electrode of the energy storage battery; K represents the proportionality coefficient.

[0063] In another exemplary embodiment of the present application, as Figure 7 shown, the identification and error correction logic module includes: a judgment logic unit (i.e., Figure 7 the judgment logic circuit 105 of

[0064]

[0065] The mixed connection identification and error correction unit includes a first comparator 221, a second comparator 222, a first AND gate 223, a second AND gate 224, a first delay circuit 225, a second delay circuit 226, and an RS flip-flop 227.The positive inputs of the first comparator and the second comparator are the reference voltage; the negative electrode of the first comparator is connected to the first detection node in the emergency lighting circuit; the negative electrode of the second comparator is connected to the second detection node in the emergency lighting circuit; the enable terminals of the first comparator and the second comparator are connected to the output terminal of the judgment logic unit.

[0066] The output terminal of the first comparator is connected to the second input terminal of the first AND gate, and the output terminal of the first AND gate is connected to the S terminal of the RS flip-flop through the first delay circuit; the QB terminal of the RS flip-flop is connected to the first input terminal of the first AND gate.

[0067] The output terminal of the second comparator is connected to the first input terminal of the second AND gate, and the output terminal of the second AND gate is connected to the R terminal of the RS flip-flop through a second delay circuit; the Q terminal of the RS flip-flop is connected to the second input terminal of the second AND gate.

[0068] The input terminals of the judgment logic unit are respectively connected to the first detection node and the second detection node in the emergency lighting circuit; the output terminal of the judgment logic unit is also connected to the current random generation module.

[0069] The judgment logic unit is used to judge whether the current emergency lighting fixture is in the state of being powered by the AC power grid and to judge whether to start the emergency light source according to the voltages of the current first detection node and the second detection node; if the judgment results are both yes, start the emergency lighting source, and at the same time start the first comparator and the second comparator to enter the working state to perform the mixed connection judgment; when the AC power grid supplies power to the emergency lighting fixture, start the current random generation module.

[0070] The identification and error correction logic module of the present application introduces a mixed connection identification and error correction function on the basis of the judgment logic unit in the existing emergency lighting circuit, that is, the judgment logic unit adopts the basic function of the judgment logic unit in the existing emergency lighting circuit, and the specific structure of the judgment logic unit is the prior art and will not be elaborated here.

[0071] In another exemplary embodiment of the present application, as Figure 6 shown, the mixed connection correction module includes: a first switch (i.e., Figure 6 switch 211 in Figure 6 ), a second switch (i.e., Figure 6 switch 212 in Figure 6 ), a third switch (i.e.,

[0072] switch 214 in 106 ), and a fourth switch (i.e., 106 switch 213 in 106 ).

[0073] The driving terminals of the first switch, the second switch, the third switch and the fourth switch are all connected to the output terminal of the identification and error correction logic module.

[0074] Figure 6This is only an example of an implementation method for realizing crosstalk correction, and other implementation methods for realizing crosstalk correction can also be adopted. Figure 6 In Figure 6 , four switches 211, 212, 213, and 214 are used. These four switches are the execution elements for correcting crosstalk. When the output signal EN1 of the recognition and error correction logic circuit 220 is high and EN2 is low, switches 211 and 212 are closed and connected, and switches 213 and 214 are disconnected. At this time, the AC1 node is the read current output node, and the AC2 node is the read current input node; conversely, when the output signal EN1 of the recognition and error correction logic circuit 220 is low and EN2 is high, switches 211 and 212 are disconnected, and switches 213 and 214 are closed and connected. At this time, the AC2 node is the read current output node (also called the current output node), and the AC1 node is the read current input node (also called the current input node).

[0075] Figure 7 This is a specific implementation method of the recognition and error correction logic module 220. Other specific structures can also be adopted to realize the recognition and error correction function. Figure 7 The working principle of Figure 7 is as follows: When the power grid is normally powered and the control switch 110 is in the closed state, the judgment logic module 105 will output a high-level signal ACON to start the read current random generation circuit 210. When the power grid is in a power-off state and the control switch 110 is in the closed state or the control switch 110 is in the open state, the judgment logic circuit 105 will judge whether the emergency light source should be started according to the voltages of the two nodes AC1 and AC2. If necessary, the judgment logic circuit 105 will output a high-level signal EMON to start the emergency light source and at the same time start the comparators 221 and 222 to make them enter the working state. Figure 6 The 3V LED 217 in Figure 6 is the emergency light source, and the resistor 216 is the current-limiting resistor. When EMON is high, the switch 215 is turned on, and the emergency light source can be started. When the signal EMON is high, when EN1 is high, it means that the node AC1 is the current read current output node, and the negative input terminal of the comparator 221 is connected to the AC1 node; at the same time, since EN2 is low level, the AND gate 224 will shield the output of the comparator 222 (whose negative input terminal is connected to the AC2 node) to ensure that the RS flip-flop 227 will not be reset during this period. Once the voltage of the AC1 node is effectively lower than the reference voltage V REF = K * I R *(R 101 + R 102 + R 106) When the output of the comparator 221 changes from low level to high level (indicating a cross-connection in the system), the high-level output is sent to the S terminal (S is high, set) of the RS flip-flop 227 through the AND gate 223 and the delay circuit 225 to set the RS flip-flop, making its Q terminal (i.e., EN1B) change from low level to high level, and at the same time, the QB terminal (i.e., EN1) changes from high level to low level, that is, EN1 = 1 becomes EN1 = 0, and EN1B = 0 becomes EN1B = 1. EN1B = 1 means that AC2 becomes the current read current output node, and the output result of the comparator 222 with its negative input terminal connected to AC2 can pass through the AND gate 224 and the delay circuit 226 and finally be sent to the reset terminal R of the RS flip-flop 227. EN1 = 0 will cause the AND gate 223 to block the output of the other comparator 221. In this state (EN1B = 1, EN1 = 0), once the voltage of the AC2 node is effectively lower than the reference voltage V REF = K * I R *(R 101 + R 102 + R 106 ) When the output of the comparator 222 changes from low level to high level (indicating another cross-connection in the system), its high-level output signal is sent to reset the RS flip-flop 227, making EN1B = 1 become EN1B = 0, and EN1 = 0 become EN1 = 1, and once again designating the AC1 node as the read current output node. The EN1B signal is the logical inverse of the EN1 signal, that is, Figure 6 the EN2 signal in

[0076] Based on the above, the key means for the present application to accurately identify cross-connection situations are as follows:

[0077] (1) The basis for judging cross-connection is that the voltage of the current read current output node is lower than the normally specified reference voltage. The lower it is, the more reliable the judgment result. The specified reference voltage is equal to K * IR * (R101 + R102 + R106), and the proportionality coefficient K < 0.8.

[0078] (2) The larger the output resistance 104 of the internal current source 103 of the chip, the more beneficial it is, such as greater than 200 M ohms.

[0079] (3) Randomly select the magnitude of the read current, and the selectable gears are greater than or equal to 2. More preferably, the difference in magnitude between adjacent random current gears is more than 10%.

[0080] (4) The system will randomly select the magnitude of the read current (i.e., I R ) again each time it is in the AC working state, and keep the magnitude of the read current unchanged in other states.

[0081] In another exemplary embodiment of the present application, such as Figure 8As shown in the figure, a connection mixing detection method implemented based on the above zero - live - wire connection mixing detection device is provided, including:

[0082] Step S1: Determine whether the emergency lighting fixture is powered by an AC power grid to obtain a first determination result.

[0083] If the first determination result is negative, then execute step S2: Determine whether to activate the emergency light source based on the voltages of the current first detection node and second detection node, and obtain a second determination result. The first detection node and the second detection node of the emergency lighting circuit are respectively connected to the live wire and the neutral wire of the AC power grid in one - to - one correspondence through isolation resistors; when the first detection node is the current input node, the second detection node is the current output node; when the first detection node is the current output node, the second detection node is the current input node.

[0084] If the second determination result is positive, then execute step S3: Determine whether there is a zero - live - wire connection mixing in the emergency lighting circuit based on the comparison result between the voltage of the current current output node of the emergency lighting circuit and the reference voltage, and obtain a third determination result; the reference voltage is determined according to the current output by the current source in the emergency lighting circuit.

[0085] If the third determination result is positive, then execute step S4: Adjust the current input node of the current emergency lighting circuit to the current output node, and adjust the current output node to the current input node.

[0086] In step S2, when determining whether to activate the emergency light source, the state of the power grid access control switch is uncertain and may be misjudged as the closed state (for example, when in a connection - mixing state). Therefore, when determining to activate the emergency light source, it is necessary to further determine whether there is a connection mixing. When the determination result of step S2 is positive and the determination result of step S3 is also positive, an error - correction action needs to be executed, indicating that the current power grid access control switch is in the open state; when the determination result of step S2 is positive and the determination result of step S3 is negative, it indicates that the current power grid access control switch is in the closed state.

[0087] In another exemplary embodiment of the present application, if the first determination result is positive, then control the current source in the emergency lighting circuit to randomly generate an output current; the reference voltage changes dynamically with the current randomly output by the current source in the emergency lighting circuit.

[0088] In another exemplary embodiment of the present application, the calculation formula for the reference voltage is:

[0089] V REF =K*I R *(R 101 +R 102 +R 106 )

[0090] Among them, V REF represents the reference voltage; I R represents the latest output current randomly generated by the current source in the emergency lighting circuit; R 101 and R 102 represent the isolation resistances between the first detection node and the second detection node of the emergency lighting circuit and the live wire and the neutral wire of the AC power grid; R 106 represents the current detection resistance between the current input node of the emergency lighting circuit and the negative electrode of the energy storage battery; K represents the proportionality coefficient.

[0091] The main differences between this application and the prior art (CN201910837502, CN2021101675362, CN202411974685X) are summarized as follows:

[0092] (1) In the above prior art, the AC voltage difference of the grid input line is detected at a specific moment (the moment when the control switch 110 is turned on, or the moment when the control switch 110 is turned off). In this application, the AC voltage difference at any time and any node is not detected at all.

[0093] (2) In the above prior art, the working duration is extremely short, and it only works at the moment when the control switch 110 is turned on (or turned off), and does not work at all other times. There are no detection and correction measures for whether the subsequent system goes wrong. This may cause one or more subsystems to be in an error state for a long time and cannot correct themselves until the electric energy of the energy storage battery is exhausted. In this application, the system is continuously monitored for a long time. At any moment, once a misconnection is found, it is immediately corrected to ensure that the system is in a normal state at any moment.

[0094] (3) The prior art cannot guarantee that the system can work correctly every time. In this application, the problem of zero-fire wire misconnection can be completely solved, ensuring that the system can work stably without error for a long time with 100%.

[0095] In another exemplary embodiment of this application, this application also provides an emergency lighting system, including: emergency lighting fixtures and a detection device for detecting and correcting the zero-fire wire misconnection of the emergency lighting lamps; the detection device uses the above zero-fire wire misconnection detection device. The misconnection detection method of the zero-fire wire misconnection detection device uses the above misconnection detection method.

[0096] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these technical feature combinations do not conflict, they should all be considered to be within the scope described in this specification.

[0097] In this text, specific examples are used to illustrate the principles and implementation manners of this application. The descriptions of the above embodiments are only used to help understand the method and its core idea of this application. At the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A zero-fire wire mixed connection detection device, characterized in that, Including: An identification and error correction logic module and a mixed connection correction module; The input end of the identification and error correction logic module is electrically connected to the first detection node and the second detection node of the emergency lighting circuit; the output end of the identification and error correction logic module is electrically connected to the mixed connection correction module; the first detection node and the second detection node of the emergency lighting circuit are respectively connected to the live wire and the neutral wire of the AC power grid through isolation resistors in one-to-one correspondence; when the first detection node is the current input node, the second detection node is the current output node; when the first detection node is the current output node, the second detection node is the current input node; The identification and error correction logic module is configured to, when the grid access control switch in the emergency lighting circuit is in the off state, determine whether there is a zero-fire wire mixed connection in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage, and when there is a zero-fire wire mixed connection, output an error correction instruction to the mixed connection correction module; The reference voltage is determined according to the current output by the current source in the emergency lighting circuit; The mixed connection correction module is arranged at the current input node and the current output node of the emergency lighting circuit, and is configured to adjust the current input node of the current emergency lighting circuit to the current output node and adjust the current output node to the current input node according to the error correction instruction output by the identification and error correction logic module.

2. The zero-fire wire mixed connection detection device according to claim 1, characterized in that The zero-fire wire mixed connection detection device further includes: a current random generation module; The current random generation module is electrically connected to the identification and error correction logic module, and is configured to control the current source in the emergency lighting circuit to randomly generate an output current; the reference voltage changes dynamically with the current randomly output by the current source in the emergency lighting circuit.

3. The zero-fire wire mixed connection detection device according to claim 2, characterized in that, The calculation formula of the reference voltage is: V REF = K * I R *(R 101 + R 102 + R 106 ) Among them, V REF represents the reference voltage; I R represents the latest output current randomly generated by the current source in the emergency lighting circuit; R 101 and R 102 represent the isolation resistances between the first detection node and the second detection node of the emergency lighting circuit and the live wire and the neutral wire of the AC power grid; R 106 represents the current detection resistance between the current input node of the current emergency lighting circuit and the negative electrode of the energy storage battery; K represents the proportionality coefficient.

4. The zero-fire wire mixed connection detection device according to claim 2, characterized in that, The identification and error correction logic module includes: a judgment logic unit and a mixed connection identification and error correction unit; The mixed connection identification and error correction unit includes a first comparator, a second comparator, a first AND gate, a second AND gate, a first delay circuit, a second delay circuit and an RS flip-flop; The positive inputs of the first comparator and the second comparator are the reference voltage; the negative input of the first comparator is connected to the first detection node in the emergency lighting circuit; the negative input of the second comparator is connected to the second detection node in the emergency lighting circuit; the enable terminals of the first comparator and the second comparator are connected to the output terminal of the judgment logic unit; The output terminal of the first comparator is connected to the second input terminal of the first AND gate, and the output terminal of the first AND gate is connected to the S terminal of the RS flip-flop through the first delay circuit; the QB terminal of the RS flip-flop is connected to the first input terminal of the first AND gate; The output terminal of the second comparator is connected to the first input terminal of the second AND gate, and the output terminal of the second AND gate is connected to the R terminal of the RS flip-flop through the second delay circuit; the Q terminal of the RS flip-flop is connected to the second input terminal of the second AND gate; The input terminals of the judgment logic unit are respectively connected to the first detection node and the second detection node in the emergency lighting circuit; the output terminal of the judgment logic unit is also connected to the current random generation module; The judgment logic unit is used to judge whether the current emergency lighting fixture is in the state of being powered by the AC power grid and to judge whether to start the emergency light source according to the voltages of the current first detection node and the second detection node; if the judgment results are both yes, start the emergency lighting light source and start the first comparator and the second comparator to enter the working state; when the AC power grid supplies power to the emergency lighting fixture, start the current random generation module.

5. The zero-fire wire mixed connection detection device according to claim 1, characterized in that, The mixed connection correction module includes: a first switch, a second switch, a third switch, and a fourth switch; The first switch is arranged on the branch between the first detection node and the current source in the emergency lighting circuit; the second switch is arranged on the branch between the second detection node and the current detection resistor in the emergency lighting circuit; the third switch is arranged on the branch between the second detection node and the current source in the emergency lighting circuit; the fourth switch is arranged on the branch between the first detection node and the current detection resistor in the emergency lighting circuit; the current detection resistor is the resistor on the branch between the current input node and the negative electrode of the energy storage battery. The driving ends of the first switch, the second switch, the third switch, and the fourth switch are all connected to the output end of the identification and error correction logic module.

6. The zero-fire wire mixed connection detection device according to claim 1, characterized in that, The resistance value of the output resistance of the current source in the emergency lighting circuit is greater than the preset resistance value.

7. A mixing connection detection method implemented based on the zero - live wire mixed connection detection device according to any one of claims 1 to 6, characterized in that, It includes: Judge whether the emergency lighting fixture is powered by the AC power grid to obtain a first judgment result; If the first judgment result is no, judge whether to start the emergency light source according to the voltages of the current first detection node and the second detection node to obtain a second judgment result; The first detection node and the second detection node of the emergency lighting circuit are respectively connected to the live wire and the neutral wire of the AC power grid through isolation resistors in a one-to-one correspondence; when the first detection node is the current input node, the second detection node is the current output node; When the first detection node is the current output node, the second detection node is the current input node; If the second judgment result is yes, judge whether there is a zero-fire wire mixed connection in the emergency lighting circuit according to the comparison result between the voltage of the current output node of the current emergency lighting circuit and the reference voltage to obtain a third judgment result; The reference voltage is determined according to the current output by the current source in the emergency lighting circuit; If the third judgment result is yes, adjust the current input node of the current emergency lighting circuit to the current output node and adjust the current output node to the current input node.

8. The hybrid connection detection method according to claim 7, characterized in that, If the first judgment result is yes, control the current source in the emergency lighting circuit to randomly generate an output current; the reference voltage changes dynamically with the current randomly output by the current source in the emergency lighting circuit.

9. The hybrid connection detection method according to claim 8, wherein, The calculation formula of the reference voltage is: V REF = K * I R *(R 101 + R 102 + R 106 ) Among them, V REF represents the reference voltage; I R represents the latest output current randomly generated by the current source in the emergency lighting circuit; R 101 and R 102 represent the isolation resistances between the first detection node and the second detection node of the emergency lighting circuit and the live wire and the neutral wire of the AC power grid; R 106 represents the current detection resistance between the current input node of the emergency lighting circuit and the negative electrode of the energy storage battery; K represents the proportionality coefficient.

10. An emergency lighting system, characterized in that, It includes: An emergency lighting fixture and a detection device for detecting and correcting the zero-fire wire mixed connection of the emergency lighting lamp; the detection device adopts the zero-fire wire mixed connection detection device described in any one of claims 1 to 6.

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