CN210222204U - A release coil monitoring circuit - Google Patents
A release coil monitoring circuit Download PDFInfo
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- CN210222204U CN210222204U CN201920845761.5U CN201920845761U CN210222204U CN 210222204 U CN210222204 U CN 210222204U CN 201920845761 U CN201920845761 U CN 201920845761U CN 210222204 U CN210222204 U CN 210222204U
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- 238000013461 design Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000006978 adaptation Effects 0.000 abstract description 4
- 238000012216 screening Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
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Abstract
The utility model relates to a tripper coil monitoring circuit, it mainly adopts three-way power design technique, and photoelectric isolation output technique and software algorithm realize coil monitoring function. The adaptation of any monitoring relay is realized, and the problem that a large amount of work is needed when products are needed to be verified to be adapted with the monitoring relay in the prior art is solved. The internal state of the tripper is monitored, damage caused by special reasons is identified, and serious accidents caused by the damage are avoided. The circuit comprises a power input acquisition module, a tripper monitoring module and a monitoring signal output module, wherein the power input acquisition module is used for screening a power supply and sending the result to the tripper monitoring module in the form of an electric signal, the result is used as one of the inputs for judging the state of the tripper to participate in the judgment of the state of the tripper, and the result judged by the tripper monitoring module is output through the monitoring signal output module.
Description
Technical Field
The utility model relates to a release technical field, especially a release coil monitoring circuit.
Background
The work hours of a shunt/closing release of the power circuit breaker are instantaneous, the shunt/closing release can work only in the moment of power supply, and the shunt/closing release is in a non-working state of power failure at other times. The power circuit breaker has very high requirement on reliability, and if the tripper cannot normally switch on or switch off, great economic loss can be caused, and other more serious results can be caused. Therefore, the circuit breaker product is required to have a monitoring function when the control cabinet is designed.
The existing release products generally only have two power input ports and no other ports, and coil monitoring can only be judged by monitoring the working current of the release through external relay protection equipment. The external relay protection equipment cannot acquire the current state of the release; meanwhile, the characteristics and the working principle of relay protection equipment on the market are very different, the passive monitoring function cannot realize the generalization of products and can be realized only by specific relay protection equipment, so that in the face of various relay protection equipment on the market, a lot of experiments are needed to verify the applicability of the products, and therefore, the condition monitoring of the tripper has great limitation; and the judgment of tripping failure caused by special reasons cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a tripper coil monitoring circuit, it mainly adopts three-way power design technique, and photoelectric isolation output technique and software algorithm realize coil monitoring function. The adaptation of any monitoring relay is realized, and the problem that a large amount of work is needed when products are needed to be verified to be adapted with the monitoring relay in the prior art is solved. The internal state of the tripper is monitored, damage caused by special reasons is identified, and serious accidents caused by the damage are avoided.
The technical scheme of the utility model is realized like this:
a monitoring circuit of a coil of a tripper comprises a power input acquisition module, a tripper monitoring module and a monitoring signal output module, wherein the power input acquisition module discriminates a power supply and sends the result to the tripper monitoring module in the form of an electric signal, the result is used as one of inputs for judging the state of the tripper to participate in judgment of the state of the tripper, and the result judged by the tripper monitoring module is output through the monitoring signal output module.
Further, the power input acquisition module comprises a resistor R1, a resistor R2, an optical coupler OC1, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6 and a capacitor C1; the positive electrode of the capacitor C1 is connected to VCC, and the negative electrode is grounded; the diode D1 is connected in series with the diode D2 and then connected in parallel with the capacitor C1; the diode D3 is connected in series with the diode D4 and then connected in parallel with the capacitor C1; the diode D5 is connected in series with the diode D6 and then connected in parallel with the capacitor C1;
the node between the diode D5 and the diode D6 is connected with an auxiliary power supply; the node between the diode D1 and the diode D2 is connected to an external power main; the other path and one end of the resistor R1 are connected with an external power main power supply, and the other end of the resistor R1 is connected with an input positive pole pin of the optical coupler OC 1; the output positive pin output of the optocoupler OC1 is divided into two paths, one path is connected with the resistor R2 in series and then connected with a 3.3v power supply, and the other path is connected with the tripper monitoring module; the negative pole pin of the optical coupler OC1output is grounded; the power common terminal is divided into two ways, one way access diode D3 with between the diode D4, another way with the input negative pole foot of opto-coupler OC1 is connected.
Further, the trip monitoring module comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a coil L1, a diode T7, a controller MCU and an NMOS tube Q1; the resistor R2, the resistor R3 and the resistor R4 are sequentially connected in series from a power supply VCC and then grounded; the resistor R5, the resistor R6 and the resistor R7 are sequentially connected in series from the positive electrode of the power supply and then grounded; the AD1 pin of the controller MCU is connected between the resistor R3 and the resistor R4; the AD2 pin of the controller MCU is connected between the resistor R7 and the resistor R6; the anode of the diode is connected with a power supply VCC, the cathode of the diode is connected with the drain electrode of the NMOS tube Q1, and the source electrode of the NMOS tube Q1 is grounded after being connected with the resistor R9 in series; the coil L1 is connected in parallel with the diode T7; the grid electrode of the NMOS tube Q1 is connected with the resistor R8 in series and then connected with the PWM pin of the controller MCU; the AD3 pin of the controller MCU is connected between the resistor R9 and the source electrode of the NMOS transistor Q1.
Further, the monitoring signal output module comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a photoelectric solid-state relay SSR, a triode Q2 and a power supply D; an input positive electrode of the photoelectric solid-state relay SSR is connected with the resistor R10 in series and then is connected with a 3.3V power supply; an input negative electrode of the photoelectric solid-state relay SSR is connected with a collector of the triode Q2; the emitter of the triode Q2 is grounded; the base electrode of the triode is connected with the resistor R11 in series and then is connected to a P0 pin of the controller MCU; one end of the resistor R12 is connected with the base electrode of the triode Q2, and the other end of the resistor R12 is grounded; the output t positive pole output of the photoelectric solid-state relay SSR is divided into two paths, one path is connected with the positive pole of the power supply D after being connected with the resistor R13 in series, and the other path is used for signal output; and an output cathode of the photoelectric solid-state relay SSR is connected with a cathode of the power supply D.
From the above description of the present invention, compared with the prior art, the present invention has the following advantages:
one, the utility model discloses mainly adopt algorithm on three-way power design, photoelectric isolation technique and the controller MCU software to realize the coil monitor function, the utility model discloses main mode switching function all is digital quantity signal input/output, saves the calculation to the analog quantity on the software, makes more succinct in the design.
Two, the utility model discloses a photoelectric isolation technique can realize the arbitrary lectotype to outside supervisory relay as the output of coil monitoring state, the utility model discloses only provide the output of photoelectric type solid state relay SSR, can realize the universalization to photoelectric type solid state relay SSR digital output, the outside can change corresponding parameter according to practical application's supervisory relay's model to when realizing to arbitrary supervisory relay's adaptation, required work when solving prior art and need verifying product and supervisory relay adaptation in a large number.
Thirdly, the utility model discloses a monitoring function is mainly according to the characteristic of coil, through the control frequency and the duty cycle that reduce the coil, carries out the sampling discernment through sampling resistance again, and through the mode of statistics, whether normal by the automatic judgement coil of the inside MCU of release, recycle the photoelectric isolation with signal transmission to the outer control mechanism of product. The method can avoid the misoperation of the coil and realize the monitoring function of the coil.
And fourthly, the inside of the tripper cannot normally work when the tripper is damaged due to special reasons, the work can be stopped when the photoelectric isolation of the monitoring port is realized, a high-level signal is presented to the outside and is consistent with a judgment signal of coil disconnection, the damage of the tripper is identified, namely, the current state of the tripper is identified through judging the photoelectric isolation output of the tripper from the outside, the occurrence of misoperation in practical application is reduced, and serious accidents caused by the misoperation are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit diagram of a power input acquisition module according to the present invention;
fig. 2 is a schematic diagram of a circuit diagram of a trip monitoring module according to the present invention;
fig. 3 is a schematic diagram of a circuit diagram of the monitoring signal output module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A monitoring circuit of a coil of a tripper comprises a power input acquisition module, a tripper monitoring module and a monitoring signal output module, wherein the power input acquisition module discriminates a power supply and sends the result to the tripper monitoring module in the form of an electric signal, the result is used as one of inputs for judging the state of the tripper to participate in judgment of the state of the tripper, and the result judged by the tripper monitoring module is output through the monitoring signal output module.
Referring to fig. 1, the power input acquisition module includes a resistor R1, a resistor R2, an optocoupler OC1, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, and a capacitor C1; the positive electrode of the capacitor C1 is connected to VCC, and the negative electrode is grounded; the diode D1 is connected in series with the diode D2 and then connected in parallel with the capacitor C1; the diode D3 is connected in series with the diode D4 and then connected in parallel with the capacitor C1; the diode D5 is connected in series with the diode D6 and then connected in parallel with the capacitor C1;
the node between the diode D5 and the diode D6 is connected with an auxiliary power supply; the node between the diode D1 and the diode D2 is connected to an external power main; the other path and one end of the resistor R1 are connected with an external power main power supply, and the other end of the resistor R1 is connected with an input positive pole pin of the optical coupler OC 1; the output positive pin output of the optocoupler OC1 is divided into two paths, one path is connected with the resistor R2 in series and then connected with a 3.3v power supply, and the other path is connected with the tripper monitoring module; the negative pole pin of the optical coupler OC1output is grounded; the power common terminal is divided into two ways, one way access diode D3 with between the diode D4, another way with the input negative pole foot of opto-coupler OC1 is connected.
The power input acquisition module will be described in detail below: it includes:
designing a power supply: the utility model discloses a three-wire power's rectification scheme divides into power supply common port (AC _ N/DC-), main power source (AC _ L/DC +) and auxiliary power source (AC _ L/DC +) altogether. The external part controls the control of the power supply of the product by respectively controlling the main power supply end and the auxiliary power supply end. As shown in fig. 1: the main power and the auxiliary power are switched by controlling a switch K1 and a switch K2, and the priority of the software in the MCU is defined as main power > auxiliary power; when the main power supply is connected, the coil is controlled by software in the controller MCU to complete excitation action; when the auxiliary power supply is connected, the software in the controller MCU controls the coil to complete the coil monitoring function; when the main power supply and the auxiliary power supply coexist, the power supply with a higher priority is set as a main operation state.
And (3) power supply switching design: as shown in fig. 1, an optical coupler OC1 is connected to a line of a main power supply to collect signals of the main power supply, when the main power supply is connected, the optical coupler OC1 is activated and conducted, and a low-level signal is provided to a controller MCU through an AD5 pin, so that signal collection and identification of the power supply state are realized; the optical coupler preferably adopts a bidirectional input low-power consumption type, and can realize the immediate collection of alternating current/direct current. When the main power switch K1 is switched off and the auxiliary power switch K2 is switched on, the optical coupler OC1 is switched off and switched on, and a high-level signal is provided for the controller MCU through an AD5 pin; therefore, the switching identification of the three-wire main auxiliary power supply can be realized, and the monitoring of the internal state of the release can be further realized. Resistance R1 and resistance R2 on the circuit are current-limiting resistor, can carry out actual adjustment according to actual opto-coupler model, the utility model discloses mainly relate to the low-power consumption during the design, consequently selection on resistance R1 can be adjusted according to the model, then resistance R1 resistance can be about 1M if 220V supply voltage's product, let its input current tend to the minimum as far as possible, output resistance R2 then adjusts to about 100K, let opto-coupler OC1 can work in normal current transmission ratio within range, can fall to minimumly with the electric current of complete machine.
Referring to fig. 2, the trip monitoring module includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a coil L1, a diode T7, a controller MCU and an NMOS transistor Q1, wherein the model of the MCU is STM32L011F 4; the resistor R2, the resistor R3 and the resistor R4 are sequentially connected in series from a power supply VCC and then grounded; the resistor R5, the resistor R6 and the resistor R7 are sequentially connected in series from the positive electrode of the power supply and then grounded; the AD1 pin of the controller MCU is connected between the resistor R3 and the resistor R4; the AD2 pin of the controller MCU is connected between the resistor R7 and the resistor R6; the anode of the diode is connected with a power supply VCC, the cathode of the diode is connected with the drain electrode of the NMOS tube Q1, and the source electrode of the NMOS tube Q1 is grounded after being connected with the resistor R9 in series; the coil L1 is connected in parallel with the diode T7; the grid electrode of the NMOS tube Q1 is connected with the resistor R8 in series and then connected with the PWM pin of the controller MCU; the AD3 pin of the controller MCU is connected between the resistor R9 and the source electrode of the NMOS transistor Q1.
The monitoring function of the release is realized: when the external power supply is an auxiliary power supply, the software in the controller MCU recognizes the monitoring function, and the software system in the controller MCU enters a coil L1 monitoring mode, in this mode, if the coil L1 is controlled according to the conventional frequency of several KHz, no voltage can be collected on the sampling resistor R9 basically, because the frequency is too fast, therefore, in order to realize the monitoring of the coil L1, the frequency of the PWM signal for controlling the MOS tube Q1 is reduced by 50-400 Hz on the software in the controller MCU, and a 10% duty ratio is provided, so that a triangular wave with the Vpp of 200mV can be collected on the resistor R9 (the waveform is mainly caused by the characteristics of the coil per se). And the ADC is adopted to collect the signal on software, and multiple measurements are taken for judgment, so that the phenomena of misjudgment and the like are avoided.
Software in the controller MCU calculates the number of triangular waves of a sampling signal of the resistor R9 in a statistical mode to judge, when the number of the triangular waves is larger than a certain threshold value in a certain time, the identification coil L1 normally exists, otherwise, the identification coil L1 is disconnected. The monitoring function of coil L1 is thereby realized.
Referring to fig. 3, the monitoring signal output module includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, a photoelectric type solid state relay SSR, a transistor Q2, and a power supply D; an input positive electrode of the photoelectric solid-state relay SSR is connected with the resistor R10 in series and then is connected with a 3.3V power supply; an input negative electrode of the photoelectric solid-state relay SSR is connected with a collector of the triode Q2; the emitter of the triode Q2 is grounded; the base electrode of the triode is connected with the resistor R11 in series and then is connected to a P0 pin of the controller MCU; one end of the resistor R12 is connected with the base electrode of the triode Q2, and the other end of the resistor R12 is grounded; the output t positive pole output of the photoelectric solid-state relay SSR is divided into two paths, one path is connected with the positive pole of the power supply D after being connected with the resistor R13 in series, and the other path is used for signal output; and an output cathode of the photoelectric solid-state relay SSR is connected with a cathode of the power supply D.
And (3) monitoring signal output module design: the signal output adopts an electrical isolation element, thereby avoiding the influence of external control signals on the product and ensuring the electricity utilization safety. The electric isolation element preferably adopts a photoelectric relay (SSR), the driving current is small, the element size is small, and the output end is allowed to be connected with an alternating current or direct current signal; if a common optical coupler is adopted, the output end can only be connected with a direct current signal; if a common relay is adopted, the size is larger, the driving current is larger, and the power consumption of the whole machine is larger. As shown in fig. 3, the present invention includes two circuits shown in fig. 3, which are used for outputting the excitation signal and the monitoring signal.
In the coil monitoring mode, when the coil L1 is disconnected, the main control MCU controls the PO pin to output a low level to stop the photoelectric isolation output, and the external measurement signal is a high level, which indicates that the coil L1 is disconnected; when the coil L1 is normal, the PO pin of the MCU outputs high level, the photoelectric isolation output is started, and the external measurement signal is low level.
When the external power supply is switched to the main power supply, the coil L1 is excited, in the coil L1 excitation mode, the photoelectric relay control signal excited by the coil L1 is set to be in a high level, and when a low level signal is detected externally, the working state of the current tripper is an excitation state.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845761.5U CN210222204U (en) | 2019-06-05 | 2019-06-05 | A release coil monitoring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845761.5U CN210222204U (en) | 2019-06-05 | 2019-06-05 | A release coil monitoring circuit |
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| CN210222204U true CN210222204U (en) | 2020-03-31 |
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| CN201920845761.5U Withdrawn - After Issue CN210222204U (en) | 2019-06-05 | 2019-06-05 | A release coil monitoring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A release coil monitoring circuit and monitoring method |
-
2019
- 2019-06-05 CN CN201920845761.5U patent/CN210222204U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A release coil monitoring circuit and monitoring method |
| CN110146807B (en) * | 2019-06-05 | 2024-11-22 | 厦门立林电气控制技术有限公司 | A trip coil monitoring circuit and monitoring method |
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