CN107991605A - Relay life count measurement method - Google Patents

Abstract

A relay life counting measurement method, capable of simultaneously counting the number of actions of multiple relay switch groups in different relays to obtain the action count value, and according to the error between the action count value and the number of on-off times, or the counting process The number of out-of-synchronization times with the actions of the relay switch group determines whether the action count value of the relay switch group is qualified to determine whether the relay is invalid; the RS trigger is used to automatically filter out the edge jitter interference in the electrical pulse generated by the relay switch group action , to ensure the accuracy of relay life detection; adopt the method of setting multiple counters outside the controller unit to count the number of actions of the relay switch group respectively, and the number of relay switch groups to detect the relay life at the same time is not affected by the number of counters inside the controller unit limits.

Description

Relay life count measurement method

technical field

The invention relates to the field of testing methods and devices, in particular to a relay life counting and measuring method.

Background technique

The life of the relay is generally tens of thousands to hundreds of thousands of times. Simulate the use conditions of the relay, by controlling the action of the relay to make the switch on and off to generate electric pulses, and then counting the electric pulses, the life of the relay can be tested. The electric pulse generated by the action of the relay contains edge jitter, and counting the unprocessed pulse directly will cause a huge error. Use the MCU software delay method to remove the influence of the jitter pulse. When the MCU needs to perform life tests on multiple relays at the same time, the MCU software delay method will make the MCU unable to do what it wants.

Contents of the invention

In order to solve the problems existing in the existing relay life measurement, the present invention provides a relay life counting measurement method, comprising the following steps:

Step 1, initialization, including setting the detection flags of the L relay switch groups to the under-inspection state, clearing the life counter, and sending a clear signal to clear all the L action count values to 0;

Step 2, control the L relay switch groups to act once, and at the same time count the number of actions of the L relay switch groups respectively to obtain L action count values; add 1 to the life counter;

Step 3, read the current L action count values;

Step 4, judge one by one whether the relay switch group whose detection flag is in the inspection state is invalid; set the detection flag of the relay switch group judged to be ineffective this time to the stop inspection state, and at the same time use the count value of the current life counter as the The life value of the relay switch group judged as failure;

Step 5: Among the detection flags of the L relay switch groups, there are still detection statuses, return to step 2, otherwise stop detection.

Said to judge whether the relay switch group whose detection flag is in the inspection state fails, the method is that the error between the number of times the relay switch group is controlled to be turned on and off and its action count value is less than E, then the relay switch group is not invalid , otherwise invalid; the M is the maximum count value of the action count value, and the E is an integer greater than or equal to 1 and less than or equal to M/2. The judgment method that the error between the number of times the relay to be judged is controlled on and off and its action count value is less than E is to take the count value of the current life counter to M to obtain the remainder Q; The action count value is K, and when one of |K-Q|<E, or |K-(Q-M)|<E, or |K-(Q+M)|<E is satisfied, the relay to be judged The error between the number of controlled on-off and its action count value is smaller than E.

Judging whether the relay switch group whose detection flag is under inspection is invalid, the method is: when the current action count value of the relay switch group to be judged and the previous action count value are not increased by 1, the relay switch group is invalid. Otherwise, it is not invalid; the method or is, when it is judged that the current action count value of the relay switch group for S consecutive times and the previous action count value are not increased by 1, then the relay switch group is invalid, otherwise it is not invalid; the S is greater than An integer equal to 2.

Judging whether the relay switch group whose detection flag is in the inspection state is invalid, the method is also, when the count value of the current action count value of the accumulated W times of the relay switch group to be judged is not in the relationship of increasing by 1 with the previous action count value, then the relay switch group The switch group is invalid, otherwise it is not invalid; the W is an integer greater than or equal to 2.

Count the number of actions of the L relay switch groups to obtain L action count values, which are realized by L switch group action counting units with the same structure and composition; the switch group action counting unit includes a pulse generating circuit, an RS flip-flop and a three-state Output counting circuit; pulse generating circuit outputs the first initial pulse and the second initial pulse generated by the action of the relay switch group; the RS flip-flop converts the input first initial pulse and the second initial pulse into filtered edge jitter interference pulses The counting pulse; the three-state output counting circuit counts the counting pulse and outputs the action counting value. The relay switch group is composed of a relay normally open switch and a relay normally closed switch in the same relay; the level change of the first initial pulse is consistent with the action change of the normally open switch in the relay switch group, and the level change of the second initial pulse is consistent with The action changes of the normally closed switches in the relay switch group are consistent; when the normally open switch and the normally closed switch in the relay switch group are all in the off state, the state of the first initial pulse and the second initial pulse output by the pulse generating circuit are both RS flip-flops The invalid signal input state of . The maximum counting value of the switch group action counting unit is M.

The relay life counting measurement method is realized by a relay life counting measuring device including a controller unit and a relay driving unit; the control of L relay switch groups to act once is realized by the controller unit sending a relay driving signal to the relay driving unit.

The action counting values of the L switch group action counting units are all output in a three-state buffer mode; all the three-state buffer output ports of the switch group action counting units are all connected in parallel to the counting data input port of the controller unit; The three-state buffer output port of the action counting unit of each switch group is enabled one by one through the control signal, and the corresponding action count value is read in from the count data input port.

The relay life counting and measuring device also includes a gating control unit; the controller unit sends an address coding signal of the switch group action counting unit to the gating control unit, and the switching group action counting unit address coding signal is decoded by the gating control unit, Get the strobe control signal.

The beneficial effects of the present invention are: the life measurement of the relay is carried out in the form of a switch group composed of normally open switches and normally closed switches in the same relay, and the life of multiple relay switch groups in multiple relays can be detected at the same time; The trigger automatically filters out the edge jitter interference in the electric pulse generated by the action of the relay switch group, which ensures the accuracy of the relay life detection; multiple counters are set outside the controller unit to count the number of actions of the relay switch group respectively In this way, the number of relay switch groups that detect the life of the relay at the same time is not limited by the number of counters inside the controller unit.

Description of drawings

When Fig. 1 is L=4, relay life counting measurement device embodiment block diagram;

Fig. 2 is the embodiment of switch group action counting unit;

Fig. 3 is 1# pulse generating circuit embodiment;

Fig. 4 is the embodiment of RS flip-flop;

Fig. 5 is the embodiment of tri-state output counting circuit;

Fig. 6 is an embodiment of a relay driving unit.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing. The relay life counting and measuring method is realized by a relay life counting and measuring device including a controller unit, L switch group action counting units, a man-machine interface unit, and a relay driving unit. The man-machine interface unit is electrically connected to the controller unit, and is used to issue a detection command to display the life of L relay switch groups; the controller unit is electrically connected to the relay drive unit, and sends a relay drive signal to the relay drive unit to control the L relay switch groups. The action of the relay switch group; the L switch group action counting units respectively count the number of actions of the L relays to obtain L action counting values; the switch group action counting unit is electrically connected to the controller unit, and the controller unit reads the L The action count value of a switch group action count unit. When the L value is large, the action count values of the L switch group action count units are all output in a three-state buffer mode; all the three-state buffer output ports of the switch group action count units are all connected in parallel to the count data input port of the controller unit; The controller unit sends a strobe control signal to enable the three-state buffer output ports of the action counting units of each switch group one by one, and reads in the corresponding action count value from the count data input port; the controller unit sends a clear signal to make the L switch groups The action count value of the action count unit is cleared to 0. The relay life counting and measuring device may also include a gating control unit electrically connected to the controller unit; the controller unit sends a switch group action counting unit address coding signal to the gating control unit, and the gating control unit acts on the switch group The counting unit address coding signal is decoded to obtain a gate control signal, enabling the tri-state buffer output port of the switching group action counting unit corresponding to the switching group action counting unit address coding signal. 1 relay switch group refers to a switch group composed of 1 relay normally open switch and 1 relay normally closed switch in the same relay; L relay switch groups can all be in the same relay, or they can be in the same relay Among several relays, the number of relay switch groups in each relay may be the same or different.

Figure 1 is a block diagram of an embodiment of a relay life counting measuring device when L=4, including a controller unit 10, a 1# switch group action counting unit 11, a 2# switch group action counting unit 12, and a 3# switch group action counting unit 13,4 #The switch group action counting unit 14, the man-machine interface unit 15, the gating control unit 16, and the relay driving unit 17 are capable of counting and measuring the life of 4 relay switch groups at the same time.

The man-machine interface unit 15 communicates with the controller unit 10 through the interface I/O1 of the controller unit 10, and is used to detect the sending of commands, parameter modification and the display of the life of each relay switch group; the controller unit 10 communicates with the controller unit 10 through the output port OUT2 Relay drive unit 17 sends out relay drive signals to control the actions of 1# to 4# relay switch groups; 1# switch group action counting unit 11, 2# switch group action counting unit 12, 3# switch group action counting unit 13, 4# The switch group action counting unit 14 performs electric pulse generation, filtering and action counting for the four relay switch groups respectively; the controller unit 10 sends the address code of the switch group action counting unit to be gated to the gating control unit 16 through the output port OUT1 signal, the gating control unit 16 decodes the address coding signal of the switch group action counting unit, and obtains the gating control signals CS1, CS2, CS3, CS4, respectively controls the 1# switch group action counting unit 11, and the 2# switch group action counting Unit 12, 3# switch group action counting unit 13, 4# switch group action counting unit action count values CV1, CV2, CV3, CV4 are sent to the controller unit 10 through the input port IN1, IN1 is the count data input of the controller unit Port; the controller unit 10 sends a reset signal to the 1# switch group action counting unit 11, the 2# switch group action counting unit 12, the 3# switch group action counting unit 13, and the 4# switch group action counting unit 14 through the output port OUT3 CLR; when the 0-clearing signal CLR is valid, the action counting values of the 4 switch group action counting units are all cleared to 0.

Figure 2 is a block diagram of an embodiment of the action counting unit of the 1# switch group. In Fig. 2, the 1# pulse generation circuit 100 outputs the first initial pulse P11 and the second initial pulse P12 generated by the action of the 1# relay switch group; the RS flip-flop 101 will input the first initial pulse P11 and the second initial pulse P12 is converted into the counting pulse P13 after filtering the edge jitter interference pulse; the three-state output counting circuit 102 counts the counting pulse P13, and is controlled by the gate control signal CS1, and outputs the action count value CV1 of the 1# relay switch group; three The three-state output counting circuit 102 is controlled by the zero-clearing signal CLR at the same time. When the zero-clearing signal CLR is valid, the action count value in the three-state output counting circuit 103 is cleared to zero.

Figure 3 is an embodiment of the 1# pulse generating circuit. The 1# relay switch group includes a normally open switch KA1-1 and a normally closed switch KA1-2; after KA1-1 is connected in series with the load resistor R11, it is connected in parallel to the DC power supply +VCC1 and the common ground GND; the resistor R13 and the resistor R14 form a voltage divider The circuit divides the voltage on the load resistor R11, and outputs the first initial pulse P11 generated by the normally open switch KA1-1 in the 1# relay switch group; the diode VD1 acts as a one-way conduction protection, and the diode TVS1 acts as a limiter amplitude and reverse protection. After KA1-2 is connected in series with the load resistor R12, it is connected in parallel to the power supply +VCC1 and the common ground GND; the resistor R13 and the resistor R14 form a voltage divider circuit, which divides the voltage on the load resistor R12, and the output is controlled by the 1# relay switch group. The second initial pulse P12 generated by closing the switch KA1-2; the diode VD2 plays the role of unidirectional conduction protection, and the diode TVS2 plays the role of limiter and reverse protection. The diodes TVS1 and TVS2 are Zener diodes or TVS tubes. Changing the size of the load resistors R11 and R12 can adjust the size of the resistive DC load current of the normally open switch KA1-1 and the normally closed switch KA1-2 in the relay switch group to be detected. The voltage division ratio of the two voltage divider circuits needs to be comprehensively considered according to the size of the power supply +VCC1, and the allowable high level and low level ranges of P11 and P12.

When the load of the relay switch group to be detected needs to be powered by an AC power supply, in the embodiment of the 1# pulse generating circuit in Figure 3, the DC power supply +VCC1 and GND can be replaced by AC power supplies AC1 and AC2, and when the potential of AC1 is higher than that of AC2 is a positive half wave. When the normally open switch KA1-1 is turned on, the first initial pulse P11 outputs a pulse wave with a period of 20ms and a duty cycle of less than 50%; when the normally open switch KA1-1 is turned off, the first initial pulse P11 outputs Low level; when the normally closed switch KA1-2 is turned on, the second initial pulse P12 outputs a pulse wave with a cycle of 20ms and a duty cycle less than 50%; when the normally closed switch KA1-2 is turned off, the second initial pulse P12 The initial pulse P12 outputs low level; when the 1# relay switch group operates to switch the switching state, jitter pulses with indefinite width and interval may be generated at the beginning and end of the pulse wave with a period of 20ms and a duty cycle of less than 50%. Similarly, changing the size of the load resistors R11 and R12 can adjust the size of the resistive AC load current of the normally open switch KA1-1 and the normally closed switch KA1-2 in the relay switch group to be detected. The voltage division ratio of the two voltage divider circuits needs to be comprehensively considered according to the peak values of AC power supply AC1 and AC2, and the allowable high level and low level ranges of P11 and P12. The load resistors R11 and R12 can also be changed to inductive loads or capacitive loads.

Fig. 4 is an embodiment of the RS flip-flop. In Fig. 4, the NOR gates FO1 and FO2 form the RS flip-flop, the first initial pulse P11 is the set signal of the RS flip-flop, and the second initial pulse P12 is the reset signal of the RS flip-flop, both of which are active at high level. When the normally open switch KA1-1 in the 1# relay switch group is disconnected and the normally closed switch KA1-2 is closed, P11 is at low level, and the high level or positive pulse of P12 sets the count pulse P13 output from FO2 to 0; When the normally open switch KA1-1 in the 1# relay switch group is closed and the normally closed switch KA1-2 is disconnected, P12 is low level, and the high level or positive pulse of P11 sets the count pulse P13 to 1; in the relay switch group When the normally open switch and the normally closed switch are in action, they are first broken and then closed. In the process of the 1# relay switch group having its relay coil energized or de-energized, the normally open switch KA1-1 and the normally closed switch KA1 -2 There is a short time in the state of being completely disconnected. At this time, P11 and P12 are both low, and the state of the counting pulse P13 is maintained; when the normally open switch is turned from off to on, the normally closed switch has been disconnected and reset The signal is invalid, even if there is a jitter pulse when the normally open switch is turned from off to on, the jitter pulse is also a valid set signal, and P13 is set to 1; similarly, when the normally closed switch is turned from off to on, The normally open switch has been turned off, and the set signal is invalid. Even if there is a jitter pulse when the normally closed switch is turned from off to on, the jitter pulse is also a valid reset signal, and P13 is set to 0. In FIG. 4 , the output terminal of the NOR gate FO2 is the non-inverting output terminal of the RS flip-flop; the count pulse P13 can also be output from the inverting output terminal of the RS flip-flop, that is, the output terminal of the NOR gate FO1.

RS flip-flops of other forms than those shown in FIG. 4 can also be used, and the pulse generating circuit can also use other forms of circuits other than those shown in FIG. 3 . Since the first initial pulse and the second initial pulse output by the pulse generation circuit are used as the input signals of the RS flip-flop, the RS flip-flop does not allow the input set signal and reset signal to be valid at the same time, therefore, the pulse generation circuit generates the first initial pulse, The principle of the second initial pulse is: when the normally open switch and normally closed switch of the relay switch group are in the process of energizing or de-energizing the relay coil, the first initial pulse and the second initial pulse output by the pulse generation circuit are all in the off state. The states of the two initial pulses are the invalid signal input states of the RS flip-flop. For example, when both the set signal and the reset signal input by the RS flip-flop are active at high level, when all the normally open switches and normally closed switches in the relay switch group are turned off, the first initial pulse and the second initial pulse are both Low level; when the set signal and reset signal input by the RS flip-flop are both active at low level, when the normally open switches and normally closed switches in the relay switch group are all disconnected, the first initial pulse and the second initial pulse are high.

Fig. 5 is an embodiment of a three-state output counting circuit. Figure 5(a) is the embodiment 1 of the three-state output counting circuit, which is composed of a counter FC1 and a NOT gate FN1, and FC1 is an 8-bit binary counter 74HC590 with a three-state output. The counting enable terminal CCKEN of FC1 inputs 0, and the clearing control terminal CCLR is the input terminal of the clearing signal CLR of the three-state output counting circuit; the clearing signal CLR is active at low level, that is, the clearing signal CLR output by the controller unit is low power Normally, the action count value in the counter FC1 is cleared to 0; when the clear signal CLR output by the controller unit is high level, FC1 works in the counting state, and the counting pulse P13 is directly connected to the counting pulse input terminal CCK of FC1, and FC1 is in the The rising edge of the count pulse P13 counts up by 1 to obtain the action count value. The counting pulse P13 is connected to the data latch terminal RCK of FC1 through the NOT gate FN1, and the content of the internal counter of FC1 is latched to the output latch at the falling edge of the counting pulse P13. The strobe control signal CS1 is connected to the output enable control terminal G of FC1. When CS1 is at low level, FC1 outputs the action count value CV1 in the output latch from Q7-Q0; when CS1 is at high level, Q7- of FC1 Q0 is in a high-impedance state. The action count value output by the first embodiment of the three-state output count circuit is an 8-bit binary count value.

Figure 5(b) is the second embodiment of the three-state output counting circuit, which is composed of a counter FC2 and a three-state buffer FB1, FC2 is a 4-bit binary counter 74HC161, and FB1 is a three-state buffer 74HC244. The counting control terminals CTP and CTR of FC2, as well as the number setting control terminal LD are connected to 1, and the clearing control terminal CR is the input terminal of the clearing signal CLR of the three-state output counting circuit; the clearing signal CLR is active at low level, that is, the control When the clear signal CLR output by the controller unit is low level, the action count value in the counter FC2 is cleared to 0; when the clear signal CLR output by the controller unit is high level, FC2 works in the counting state, and the count pulse P13 is directly connected to To the counting pulse input terminal CP of FC2, FC2 counts by 1 on the rising edge of the counting pulse P13 to obtain the action counting value. The 4-bit data input terminals A3-A0 of the tri-state buffer FB1 are respectively connected to the 4-bit count value output terminals Q3-Q0 of the counter FC2, the strobe control signal CS1 is connected to the output enable control terminal 1G of FB1, and CS1 is low power Normally, FB1 outputs the action count value CV1 output by counter FC2 from Y3-Y0; when CS1 is high level, Y3-Y0 of FB1 is in a high-impedance state. The action count value output by the second embodiment of the three-state output count circuit is a 4-bit binary count value.

In the embodiment of the relay life counting measuring device when L=4, the 2# switch group action counting unit, the 3# switch group action counting unit and the 4# switch group action counting unit adopt the same circuit composition as the 1# switch group action counting unit and Structure, that is, all switch group action counting units include pulse generating circuits, RS flip-flops and three-state output counting circuits; the composition and structure of all pulse generating circuits, RS flip-flops, and three-state output counting circuits are the same.

Fig. 6 is an embodiment of a relay driving unit. Fig. 6 (a) is an embodiment when the relay coil is powered by a DC power supply, which is composed of a triode VT, a freewheeling diode VD, and a base resistor R61; the coil of the relay to be detected is connected in parallel on the nodes A1 and A2, and the DC power supply of the relay coil The power supply is +V. Assuming that the 4 relay switch groups in the embodiment of Fig. 1 are included in 2 relays, in Fig. 6(a), only 2 relay coils J1, J2 are connected in parallel. When the relay driving signal C1 sent by the controller unit is at high level, all the relay coils connected in parallel on nodes A1 and A2 are energized; when the relay driving signal C1 sent by the controller unit is at low level, all relay coils connected in parallel at nodes A1 and A2 All the relay coils on the node are de-energized; the relay drive signal C1 sent by the controller unit changes for one pulse period, and the relay switch group in all the relays connected in parallel with the coils on the nodes A1 and A2 acts once. When the number of relay coils is large and the triode VT in Figure 6(a) is not enough to drive all of them, the same or similar drive circuit can be added to expand the drive capability.

Fig. 6(b) is an embodiment when the relay coil is powered by an AC power supply, which is composed of a current-driven solid-state relay SSR1, a varistor RU1, and a current-limiting resistor R62; the coil of the relay to be detected is connected in parallel on nodes B1 and B2, and the relay The AC power supply of the coil is AC0; +VCC is the current drive power supply of SSR1. Assuming that the 4 relay switch groups in the embodiment of Fig. 1 are included in 2 relays, in Fig. 6(b), only 2 relay coils J3 and J4 are connected in parallel. When the relay driving signal C2 sent by the controller unit is low level, all relay coils connected in parallel on nodes B1 and B2 are energized; when the relay driving signal C2 sent by the controller unit is high level, all relay coils connected in parallel on nodes B1 and B2 All relay coils on the node B1 and B2 are de-energized; the relay drive signal C2 sent by the controller unit changes for one pulse period, and the relay switch group in all relays connected in parallel to the coils on nodes B1 and B2 acts once. When the number of relay coils is large and the solid-state relay SSR1 in Figure 6(b) is not enough to drive all of them, the same or similar drive circuits can be added to expand the drive capability.

When there are relay coils powered by DC power supply and relay coils powered by AC power supply in the relays where the L relay switch groups are located, the circuits in Figure 6(a) and Figure 6(b) can be used to classify and drive at the same time. The relay drive unit can also adopt other circuits as required.

The man-machine interface unit preferably uses a touch screen, and uses RS485 or RS232 to communicate with the controller unit. The man-machine interface unit can also choose to be composed of a key circuit and a liquid crystal display.

The action counting values of all switch group action counting units are output in a three-state buffer mode; the three-state buffer output ports of all switch group action counting units are all connected in parallel to the counting data input port of the controller unit, and the controller unit sends out a strobe control signal The three-state buffer output port of the action counting unit of each switch group is respectively enabled, and the action count value output by the enabled tri-state buffer output port is read from the count data input port. The action count value in the embodiment 1 of the three-state output counting circuit is 8-bit binary data, and the three-state buffer output port of the switch group action count unit and the count data input port of the controller unit are all 8-bit parallel ports; the three-state output count The action count value in circuit embodiment 2 is 4-bit binary data, and the tri-state buffer output port of the switch group action count unit and the count data input port of the controller unit are all 4-bit parallel ports. When the L value is small and the number of digits of the action count value is small, the action count value of the switch group action count unit may not be output in a three-state buffer mode, but the action count value output port of each switch group action count unit is directly connected to To different parallel ports of the controller unit; for example, when L=4 and the action count value is a 4-bit binary value, directly connect the action count value output ports of the action count units of the four switch groups to different parallel ports of the controller unit, It only needs to consume a total of 16 I/O lines of the controller unit, that is, two 8-bit input ports.

The controller unit sends a gating control signal through the gating control unit. The gating control unit is a decoder circuit, which decodes the address coding signal of the switch group operation counting unit sent by the controller unit to obtain the gating control signal. In the embodiment of Fig. 1, the switch group action counting unit addresses corresponding to the 1# switch group action counting unit 11, the 2# switch group action counting unit 12, the 3# switch group action counting unit 13, and the 4# switch group action counting unit The coded signals are binary 00, 01, 10, 11, and the decoding output is CS1, CS2, CS3, CS4; the controller unit makes CS1, CS2, CS3, CS4 valid one by one, and enables the three-state of each switch group action counting unit Buffer the output port, and then read in the corresponding action count value from the count data input port IN1. The decoder circuit of the gating control unit in the embodiment can be 74HC139 or 74HC138, or it can be composed of gate circuits. When the value of L is large, the decoder circuit can be composed of multiple chips of 74HC139 or 74HC138, etc., or a multi-stage cascade circuit composed of multiple gate circuits. When the L value is small, the gating control unit can also be omitted, and the gating control signal is directly sent to each switch group action counting unit by the controller unit through the output port, for example, in the embodiment of Fig. 1, the gating control signal CS1, CS2 , CS3, and CS4 can be sent directly by the controller unit 10 without using a gating control unit.

The controller unit is used for controlling the entire relay life counting and measuring device, so as to realize the relay life counting and measuring method. The controller unit is preferably composed of a single-chip microcomputer as the core, and the core of the controller unit may also be ARM, or DSP, or a programmable controller. The relay life count measurement method includes the following steps:

Step 1, initialization, including setting the detection flags of the L relay switch groups to the under-inspection state, clearing the life counter, and sending a clear signal to clear all the L action count values to 0;

Step 2, control the L relay switch groups to act once, and at the same time count the number of actions of the L relay switch groups respectively to obtain L action count values; add 1 to the life counter;

Step 3, read the current L action count values;

Step 4, judge one by one whether the relay switch group whose detection flag is in the inspection state is invalid; set the detection flag of the relay switch group judged to be ineffective this time to the stop inspection state, and at the same time use the count value of the current life counter as the The life value of the relay switch group judged as failure;

Step 5: Among the detection flags of the L relay switch groups, there are still detection statuses, return to step 2, otherwise stop detection.

Controlling L relay switch groups to turn on and off once means that the controller unit sends a signal to make the relay switch group act once through the relay drive unit. For example, the relay drive signal C1 sent by the controller unit in Figure 6(a) changes for one pulse period , or the relay driving signal C2 sent by the controller unit in Fig. 6(b) changes for one pulse period. The life counter is a software counter in the controller unit, and the controller unit sends a signal to make the L relay switch groups act once, and the count value of the life counter is increased by 1. At the same time, the on-off times of the L relays are respectively counted to obtain L action count values, which are respectively performed by the L switch group action count units outside the controller unit.

To judge whether the relay switch group whose detection flag is under inspection is invalid, the method is to judge that the error between the number of times the relay switch group is controlled to be turned on and off and its action count value is less than E, then the relay switch group is not invalid, otherwise invalidated. The specific judgment method is to take the count value of the current life counter modulo M to obtain the remainder Q; if the read count value of the action count value of the relay switch group to be judged is K, then when |K-Q|<E is satisfied, or When |K-(Q-M)|<E, or one of |K-(Q+M)|<E, the error between the number of times the relay switch group is controlled to be turned on and off and its action count value is less than E. The action count value adopts the cycle counting method. After the action count value reaches the maximum value M of the three-state output counting circuit, adding 1 will overflow and become 0; the 4-bit binary action count output by the three-state output counting circuit embodiment 2 For example, the maximum count value M is 1111, and the count value of the next action is 0; in the above judgment expression, comparing K with Q-M is to offset the value of K plus count overflow, which is smaller and the value of Q is larger Influence; Comparing K with Q+M is to offset the influence of larger K value and smaller Q value after taking the modulus of M. Since E is an integer greater than or equal to 1 and less than or equal to M/2, after determining the error E, the maximum count value of the action count value must be greater than 2 times of E; for example, if E is determined to be 3, then the maximum count value of the action count value It must be greater than 6. At this time, the decimal BCD counter or the binary counter with more than 3 digits all meet the requirements. Among the L action count values read at the current time, the controller unit no longer judges and processes the action count values of relays whose detection flags are in the shutdown state.

To judge whether the relay switch group whose detection flag is in the inspection state is invalid, the following method can also be adopted: when the current action count value of the relay switch group to be judged is not in the relationship of increasing by 1 with the previous action count value, then the relay switch group Ineffective, otherwise it is not invalid; or, if the current action count value of the relay switch group is judged to be continuous for S times and the previous action count value is not increased by 1, then the relay switch group is invalid, otherwise it is not invalid; the S is An integer greater than or equal to 2. Since the action count value adopts the cycle counting method, if the action count value reaches the maximum value of the three-state output counting circuit and then adds 1, it will overflow and become 0; the 4-bit binary on-off output of the three-state output counting circuit embodiment 2 Take the count value as an example, its maximum value is 1111, and the next on-off count value that satisfies the relationship of increasing by 1 is 0.

To judge whether the relay switch group whose detection flag is in the inspection state is invalid, the following method can also be used: when the count value of the current action of the relay switch group to be judged has reached W times and the previous action count value is not increased by 1, then The relay switch group is invalid, otherwise it is not invalid; the W is an integer greater than or equal to 2.

The controller unit and the man-machine interface unit can realize the adjustment and display of the NO and NC duty ratios of the relay switch group (that is, setting the ratio of the pull-in time and release time) according to the needs, the selection of the failure judgment method and the setting and display of the failure judgment parameters. The action cycle setting and display of the switch group, etc. The relay life counting and measuring device can also add a temperature monitoring unit to monitor the temperature of the relay during the test.

Except for the technical features described in the description, all are conventional techniques mastered by those skilled in the art. For example, select the controller of the controller unit, design related peripheral control circuits and compile programs to realize its functions; select or design the gating control unit circuit to meet the requirements of decoding gating; select or design the drive circuit of the relay drive unit, Realize the requirements for controlling L relay switch groups; select the composition and circuit structure of the human-machine interface unit, connect with the controller unit, and realize the corresponding functions; etc., are all conventional technologies mastered by those skilled in the art.

Claims (10)

1. A relay life counting method for measuring, is characterized in that, comprises the following steps: Step 1, initialization, including setting the detection flags of the L relay switch groups to the under-inspection state, clearing the life counter, and sending a clear signal to clear all the L action count values to 0; Step 2, control the L relay switch groups to act once, and at the same time count the number of actions of the L relay switch groups respectively to obtain L action count values; add 1 to the life counter; Step 3, read the current L action count values; Step 4, judge one by one whether the relay switch group whose detection flag is in the inspection state is invalid; set the detection flag of the relay switch group judged to be ineffective this time to the stop inspection state, and at the same time use the count value of the current life counter as the The life value of the relay switch group judged as failure; Step 5: Among the detection flags of the L relay switch groups, there are still detection statuses, return to step 2, otherwise stop detection. 2. relay life counting measurement method according to claim 1, is characterized in that: To judge whether the relay switch group whose detection flag is under inspection is invalid, the method is to judge that the error between the number of times the relay switch group is controlled to be turned on and off and its action count value is less than E, then the relay switch group is not invalid, otherwise Invalidation: the M is the maximum count value of the action count value, and the E is an integer greater than or equal to 1 and less than or equal to M/2. 3. relay life counting measurement method according to claim 2, is characterized in that: The judging method that the error between the number of times that the relay switch group to be judged is controlled on and off and its action count value is less than E is to take the count value of the current life counter to M to obtain the remainder Q; Judging that the action count value of the relay switch group is K, when one of |K-Q|<E, or |K-(Q-M)|<E, or |K-(Q+M)|<E is satisfied, wait It is judged that the error between the number of times the relay is controlled on and off and its action count value is smaller than E. 4. relay life counting measurement method according to claim 1, is characterized in that: To judge whether the relay switch group whose detection flag is in the inspection state is invalid, the method is to judge that the current action count value of the relay switch group and the previous action count value are not increased by 1, then the relay switch group is invalid, otherwise Not invalid; method or, to judge the current action count value of the relay switch group for S consecutive times and the previous action count value are not in the relationship of increasing by 1, then the relay switch group is invalid, otherwise it is not invalid; the S is greater than or equal to Integer of 2. 5. relay life counting measurement method according to claim 1, is characterized in that: To judge whether the relay switch group whose detection flag is under inspection is invalid, the method is to judge that when the current action count value of the relay switch group has reached W times and the previous action count value does not increase by 1, then the relay switch The group fails, otherwise it does not fail; the W is an integer greater than or equal to 2. 6. The relay life counting measurement method according to claim 1, characterized in that: the number of actions of L relay switch groups is counted respectively to obtain L action count values, and the action counts of L switch groups with the same structure and composition Unit realization; the switch group action counting unit includes a pulse generating circuit, an RS flip-flop and a three-state output counting circuit; The pulse generating circuit outputs the first initial pulse and the second initial pulse generated by the action of the relay switch group; the RS flip-flop converts the input first initial pulse and the second initial pulse into counting pulses after filtering edge jitter interference pulses; The three-state output counting circuit counts the counting pulses and outputs the action counting value. 7. The measuring method of relay life counting according to claim 6 is characterized in that: the relay switch group is made up of a relay normally open switch and a relay normally closed switch in the same relay; the level change of the first initial pulse is related to the relay The action changes of the normally open switches in the switch group are consistent, and the level change of the second initial pulse is consistent with the action changes of the normally closed switches in the relay switch group; The states of the first initial pulse and the second initial pulse output by the circuit are the invalid signal input states of the RS flip-flop. 8. The relay life counting measuring method according to any one of claims 1-7, characterized in that: it is realized by a relay life counting measuring device comprising a controller unit and a relay drive unit; said control of L relay switch groups One action is realized by the controller unit sending a relay driving signal to the relay driving unit. 9. The relay life counting measurement method according to claim 8, characterized in that: the action count values of the L switch group action counting units all adopt a tri-state buffer mode output; the tri-state buffer output ports of all switch group action count units All are connected in parallel to the counting data input port of the controller unit; the controller unit sends a strobe control signal to enable the three-state buffer output ports of the action counting units of each switch group one by one, and reads in the corresponding action count value from the counting data input port. 10. The relay life counting measurement method according to claim 9, characterized in that: the relay life counting measurement device also includes a gating control unit; the controller unit sends a switch group action counting unit address coding signal to the gating control unit The gating control unit decodes the address coding signal of the switch group action counting unit to obtain the gating control signal.