CN217213092U

CN217213092U - Control circuit broken string detection circuit that can throw and move back

Info

Publication number: CN217213092U
Application number: CN202220954228.4U
Authority: CN
Inventors: 刘世验; 周学成; 张力; 黄亮; 艾少鹏; 冯喜军
Original assignee: Wasion Electric Co Ltd
Current assignee: Weisheng Energy Technology Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-08-16
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a control circuit broken string detection circuitry that can throw and move back, including combined floodgate return circuit broken string detection circuitry and separating brake return circuit broken string detection circuitry, combined floodgate return circuit broken string detection circuitry and separating brake return circuit broken string detection circuitry all with the broken string detect go up send signal end YX _ SOE continuous, combined floodgate return circuit broken string detection circuitry and separating brake return circuit broken string detection circuitry by current-limiting resistance, filter capacitance, prevent reverse diode, two opto-couplers that play the isolation constitute. By adding the control circuit disconnection detection function, whether disconnection occurs at the connection of the primary and secondary equipment or the opening and closing pressing plate or not can be judged through simple logic design; meanwhile, a broken line detection function is introduced, whether the control loop is broken or not is detected in real time through whether the master station receives the control loop broken line SOE or not, the real-time performance and the accuracy of fault detection are enhanced, and the time for engineering technicians to remove faults is saved.

Description

Control circuit broken string detection circuit that can throw and move back

Technical Field

The utility model relates to a secondary equipment broken string detection area especially relates to a control circuit broken string detection circuitry that can throw and move back.

Background

In a distribution network control system, a master station remotely operates a three-remote terminal, the three-remote terminal sends a control command after receiving the command, so that a primary device is controlled to be switched on and switched off, the three-remote terminal is mainly connected with the primary device through a line, the possibility of line disconnection exists, before line disconnection detection is not introduced, after line disconnection occurs in a control loop, the control loop is mainly observed by people or judged by field technicians, much time is needed, the timeliness of power transmission is greatly influenced, and therefore a related, low-cost and simpler line disconnection detection circuit needs to be introduced, and the circuit is generated. At present, no relevant detection circuit exists in a distribution automation control system.

In the existing power distribution control terminal, primary and secondary equipment are connected through a relay, a remote control opening and closing command is issued through a main station, after the terminal receives the command, the opening and closing relay acts, corresponding relay contacts are attracted, and primary equipment makes the opening and closing action, which is a normal work flow. When the coil at the connection of the primary and secondary equipment is disconnected, a normal command is sent from the terminal, the relay of the terminal normally acts, but the command cannot be sent to the primary equipment, and the fault cannot be timely and accurately known to exist under the condition that the disconnection detection circuit is not connected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the technology and provide a control circuit disconnection detection circuit capable of switching on and off, and by adding the control circuit disconnection detection function, whether the disconnection occurs at the primary and secondary equipment connection or the opening and closing brake pressing plate can be judged through simple logic design; meanwhile, a broken line detection function is introduced, whether the control loop is broken or not is detected in real time through whether the master station receives the control loop broken line SOE or not, the real-time performance and the accuracy of fault detection are enhanced, and the time for engineering technicians to remove faults is saved.

For solving the above technical problem, the utility model discloses the technical scheme who adopts is:

a throw-back control loop disconnection detection circuit comprises a closing loop disconnection detection circuit and an opening loop disconnection detection circuit, wherein the closing loop disconnection detection circuit and the opening loop disconnection detection circuit are electrically connected with a disconnection detection upper signal sending end YX _ SOE; the circuit breaking detection circuit of the closing loop comprises a first resistor R1, one end of the first resistor R1 is electrically connected with a signal end HZ _ YB of a closing pressure plate and a coil of primary equipment, and one end of the coil is grounded; the other end of the first resistor R1 is divided into two paths, the first path is electrically connected with one end of a third resistor R3, the second path is electrically connected with one end of a first capacitor C1, the other end of the third resistor R3 is electrically connected with a pin 1 of a first optocoupler U1, a pin 2 of the first optocoupler U1 is electrically connected with a pin 4 of a second optocoupler U2, a pin 3 of the second optocoupler U2 is divided into three paths, the first path is electrically connected with the other end of the first capacitor C1, the second path is electrically connected with a remote control closing signal YK _ HZ + through a second resistor R2, the third path is electrically connected with a closing remote sensing execution signal end HZ _ JC, the pin 4 of the first optocoupler U1 is divided into three paths, the first path is electrically connected with a disconnection detection upper sending signal end YX _ SOE, the second path is connected with a voltage V3P3 through a pull-up resistor R4, and the third path is grounded through a second capacitor C2; a pin 3 of the first optical coupler U1 is grounded; a pin 1 of the second optical coupler U2 is electrically connected with a voltage V3P3 through a fifth resistor R5, a pin 2 of the second optical coupler U2 is divided into two paths, the first path is electrically connected with a voltage V3P3 through a sixth resistor R6, and the second path is electrically connected with a disconnection detection switching signal terminal YK _ DXJC; the open circuit disconnection detection circuit of the opening circuit comprises a seventh resistor R7, one end of a seventh resistor R7 is electrically connected with a signal end FZ _ YB of an opening pressing plate, the other end of the seventh resistor R7 is divided into two paths, the first path is electrically connected with one end of a ninth resistor R9, the second path is electrically connected with one end of a third capacitor C3, the other end of the ninth resistor R9 is electrically connected with a pin 1 of a third optocoupler U3, a pin 2 of the third optocoupler U3 is electrically connected with a pin 4 of a fourth optocoupler U4, a pin 3 of the fourth optocoupler U4 is divided into three paths, the first path is electrically connected with the other end of a third capacitor C3, the second path is electrically connected with a remote control opening signal YK _ FZ + through an eighth resistor R8, and the third path is electrically connected with an opening remote sensing execution signal end FZ _ JC; the 4 pins of the third optocoupler U3 are divided into three paths, the first path is electrically connected with a disconnection detection sending-up signal end YX _ SOE, the second path passes through a pull-up resistor R4 and voltage V3P3, and the third path is grounded through a second capacitor C2; a pin 1 of the fourth optical coupler U4 is electrically connected with a voltage V3P3 through a tenth resistor R10, a pin 2 of the fourth optical coupler U4 is divided into two paths, the first path is electrically connected with a voltage V3P3 through a sixth resistor R6, and the second path is electrically connected with a disconnection detection switching signal terminal YK _ DXJC.

And the disconnection detection uploading signal end YX _ SOE is communicated with one IO of the MCU.

Preferably, the resistors in the control loop disconnection detection circuit enable the optical couplers to be normally conducted, and meanwhile, the current in the control loop disconnection detection circuit does not cause the coil driving contact of the primary equipment to be attracted.

Preferably, the other end of the third resistor R3 is also electrically connected with the cathode of a first diode D1, and the 3 pin of the second optocoupler U2 is electrically connected with the anode of a first diode D1; the other end of the ninth resistor R9 is also electrically connected with the cathode of the second diode D2, and the 3 pin of the fourth optocoupler U4 is electrically connected with the anode of the second diode D2.

Preferably, the 3 feet of the second optical coupler U2 are grounded through a first TVS diode Z1; and the pin 3 of the fourth optical coupler U4 is grounded through a second TVS diode Z2.

Preferably, the voltage value of the voltage V3P3 is 3.3V.

Preferably, the first capacitor C1 and the third capacitor C3 are both 0.1uF, and the second capacitor C2 is 1000 pF.

The utility model has the advantages that:

1. by adding the control circuit disconnection detection function, whether disconnection occurs at the connection of the primary and secondary equipment or the opening and closing pressing plate or not can be judged through simple logic design; meanwhile, a broken line detection function is introduced, whether the control loop is broken or not is detected in real time through whether the master station receives the control loop broken line SOE or not, the real-time performance and the accuracy of fault detection are enhanced, and the time for engineering technicians to remove faults is saved.

2. The diode with the unidirectional conduction characteristic for preventing the reverse input is added, so that the optocoupler is protected from being damaged due to the reverse input; a transient voltage suppression diode (TVS) is connected to absorb instant high-energy impact or surge impact suddenly appearing at two ends of an input loop and suppress the influence of the impact on internal devices; the optical coupler input and the parallelly connected filter capacitance who has the filtration alternating current composition signal in output both ends, the utility model provides a control circuit broken string detection circuitry security is high.

3. Two photoelectric coupling devices are used in one control loop, and the two photoelectric couplings are used in a combined mode, so that the problem of floating voltage in the loop is solved while the control detection circuit is controlled to be switched on and off.

Drawings

Fig. 1 is a schematic structural diagram of a circuit for detecting disconnection of a control circuit capable of switching in and out according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be further described with reference to the drawings and examples. It should be noted that the embodiments do not limit the scope of the present invention.

Example 1

As shown in fig. 1, a circuit for detecting a broken line of a control circuit capable of being switched on and off includes a circuit for detecting a broken line of a closing circuit and a circuit for detecting a broken line of an opening circuit.

The circuit breaking detection circuit of the closing loop comprises a first resistor R1, one end of a first resistor R1 is connected with a signal end HZ _ YB of a closing pressure plate and a coil of primary equipment, and one end of the coil is grounded; the other end of the first circuit is divided into two circuits, the first circuit is connected with one end of a third resistor R3, the second circuit is connected with one end of a first capacitor C1, the other end of the third resistor R3 is divided into two circuits, the first circuit is connected with a pin 1 of a first optical coupler U1, the second circuit is connected with a negative electrode of a first diode D1, a pin 2 of the first optical coupler U1 is electrically connected with a pin 4 of a second optical coupler U2, a pin 3 of the second optical coupler U2 is divided into five circuits, the first circuit is electrically connected with a positive electrode of the first diode D1, the second circuit is electrically connected with the other end of a first capacitor C1, the third circuit is electrically connected with a remote control switching-on signal YK _ HZ + through the second resistor R2, the fourth circuit is electrically connected with a switching-on remote sensing execution signal end HZ _ JC, and the fifth circuit is grounded through a first TVS diode Z1; the 4 pins of the first optocoupler U1 are divided into three paths, the first path is connected with a disconnection detection sending-up signal end YX _ SOE, the second path passes through a pull-up resistor R4 and voltage V3P3, and the third path is grounded through a second capacitor C2; a pin 3 of the first optical coupler U1 is grounded; a pin 1 of the second optical coupler U2 is electrically connected with a voltage V3P3 through a fifth resistor R5, a pin 2 of the second optical coupler U2 is divided into two paths, the first path is electrically connected with a voltage V3P3 through a sixth resistor R6, and the second path is connected with a disconnection detection switching signal terminal YK _ DXJC.

The open circuit disconnection detection circuit of the switching-off loop comprises a seventh resistor R7, one end of a seventh resistor R7 is connected with a signal end FZ _ YB of the switching-off pressing plate, the other end of the seventh resistor R7 is divided into two paths, the first path is connected with one end of a ninth resistor R9, the second path is connected with one end of a third capacitor C3, the other end of the ninth resistor R9 is divided into two paths, the first path is connected with a pin 1 of a third optocoupler U3, the second path is connected with a negative electrode of a second diode D2, a pin 2 of the third optocoupler U3 is electrically connected with a pin 4 of the fourth optocoupler U4, a pin 3 of the fourth optocoupler U4 is divided into five paths, the first path is electrically connected with a positive electrode of a second diode D2, the second path is electrically connected with the other end of the third capacitor C3, the third path is electrically connected with a remote control switching-off signal YK _ FZ + through an eighth resistor R8, the fourth path is electrically connected with a remote sensing switching-off execution signal end FZ _ JC, and the fifth path is grounded through a second diode Z2; the 4 pins of the third optocoupler U3 are divided into three paths, the first path is connected with a disconnection detection sending-up signal end YX _ SOE, the second path is connected with a voltage V3P3 through a pull-up resistor R4, and the third path is grounded through a second capacitor C2; a pin 1 of the fourth optical coupler U4 is electrically connected with a voltage V3P3 through a tenth resistor R10, a pin 2 of the fourth optical coupler U4 is divided into two paths, the first path is electrically connected with a voltage V3P3 through a sixth resistor R6, and the second path is connected with a disconnection detection switching signal terminal YK _ DXJC. And the disconnection detection uploading signal end YX _ SOE is communicated with one IO of the MCU. The output ends of the opening detection circuit and the closing detection circuit share one IO port, so that whether disconnection exists in the opening control circuit or the closing control circuit is judged by detecting whether the IO port jumps from a low level to a high level.

The resistance range of the resistor in the control loop disconnection detection circuit is such that the optical coupler can be normally conducted, but the current cannot drive the coil of the primary equipment to attract. To avoid making the primary equipment close the floodgate maloperation.

The specific working principle of the circuit is as follows:

when the control circuit broken string detection circuitry is put into use as needs, broken string detection throw move back signal terminal YK _ DXJC makes this pin be the low level through software setting, set up to "0" state promptly, make second opto-coupler U2 and fourth opto-coupler U4 be in the state of switching on, first opto-coupler U1 and third opto-coupler U3 also are in operating condition simultaneously, control circuit broken string detection circuitry just is in detecting constantly, IO monitoring YX _ SOE through MCU, what detected this moment is the low level, normal position promptly, there is not the position of broken string in the remote control circuit promptly. If the circuit has the broken wire, the disconnection is assumed to occur at the switching-on pressing plate signal end HZ _ YB or the switching-on coil of the primary equipment, at the moment, the first optocoupler U1 is not conducted because the voltage input is not available on the left, the optocoupler is not conducted, the high level is detected by the IO of the signal end YX _ SOE sent by the broken wire detection at the moment, and the master station reports the broken wire of the remote control loop. Similarly, when the signal end FZ _ YB of the opening pressing plate or the opening coil of the primary device is disconnected, the third optocoupler U3 is not switched on because no voltage passes through, and the signal end YX _ SOE sent in the disconnection detection is also at a high level, so that any position is disconnected in the opening circuit or the closing circuit at any time, and YX _ SOE is at a high level, and the disconnection of the control circuit can be reported to the master station.

Causes of loop breakage: 1. when the MCU sends a remote control command, the switching-on and switching-off control relay of the terminal can act, at the moment, the contact of the relay is closed, the broken line detection circuit is short-circuited, and the master station reports that the control circuit is broken, because the normal remote control switching-on and switching-off command is carried out, the short-circuit time is very short, and whether the report is needed to be carried out or not can be judged through software; 2. when a device of the disconnection detection circuit fails or a cold solder exists, and the opening and closing coil of the primary equipment is not connected or is not connected well, the master station reports that the control circuit is disconnected.

When the control circuit disconnection detection function is not required to be put into use, the IO can be set to be a high level through software, namely YK _ DXJC is in a state of '1', at the moment, the light emitting diodes in the second optical coupler U2 and the fourth optical coupler U4 are not conducted, the corresponding first optical coupler U1 and the corresponding third optical coupler U3 are also not conducted, and at the moment, the control circuit disconnection detection circuit is in a non-put-into conversion state.

A protection device is also added into the circuit: a diode with unidirectional conduction characteristic for preventing input reversal is added, so that the protection optocoupler is damaged due to the input reversal; a transient voltage suppression diode (namely a TVS diode) is connected to absorb instant high-energy impact or surge impact suddenly appearing at two ends of an input loop and suppress the influence of the impact on internal devices; the input end and the output end of the optical coupler are connected in parallel with a filter capacitor for filtering alternating current component signals.

The control loop disconnection detection circuit adopts a photoelectric coupling device with good signal isolation effect, and is small in size and low in power consumption, so that the control loop disconnection detection circuit is widely applied to an isolation circuit of a circuit board. Two photoelectric coupling devices are used in one control loop, and the two photoelectric couplings are used in a combined mode, so that the problem of floating voltage in the loop is solved while the control detection circuit is controlled to be switched on and off. The reason why the float voltage is generated is: when the normal three-remote terminal is powered on, the disconnection detection circuit is normally conducted, and if a coil of primary equipment is not connected or an electric department uses a platform equipment test terminal but is not loaded to GND, floating voltage is generated at an interface position (YK _ HZ +, YK _ FZ +). Through two opto-couplers cooperation use, can be when doing the terminal detection, withdraw from through software control broken string detection circuitry for second opto-coupler U2 and fourth opto-coupler U4 do not switch on, and the opto-coupler under the non-conducting state, resistance are very big, lie in the disconnection in opto-coupler position department in other words, just can restrain the input at the opto-coupler with superficial empty voltage, have solved the problem that has superficial empty voltage when introducing detection circuitry.

The broken line detection circuit of the control loop selects a photoelectric coupling device with good signal isolation effect, has small volume and low power consumption, and is widely applied to a circuit board circuit, other isolation devices such as a relay can be used for replacing the circuit, but the volume and the power of the relay are much larger than those of the photoelectric coupling, and the relay is mostly applied to a switch control circuit; the switching on and off of the circuit can be controlled by introducing a triode, but the switching on and off of the circuit can not be controlled by using the triode to inhibit the generation of the floating voltage.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A throw-back control loop disconnection detection circuit is characterized by comprising a closing loop disconnection detection circuit and a separating loop disconnection detection circuit, wherein the closing loop disconnection detection circuit and the separating loop disconnection detection circuit are both electrically connected with a disconnection detection upper signal sending end (YX _ SOE);

the circuit breaking detection circuit of the closing loop comprises a first resistor (R1), one end of the first resistor (R1) is electrically connected with a signal end (HZ _ YB) of a closing pressure plate and a coil of primary equipment, and one end of the coil is grounded; the other end of the first resistor (R1) is divided into two paths, the first path is electrically connected with one end of a third resistor (R3), the second path is electrically connected with one end of a first capacitor (C1), the other end of the third resistor (R3) is electrically connected with a pin 1 of a first optical coupler (U1), a pin 2 of the first optical coupler (U1) is electrically connected with a pin 4 of a second optical coupler (U2), a pin 3 of the second optical coupler (U2) is divided into three paths, the first path is electrically connected with the other end of the first capacitor (C1), the second path is electrically connected with a remote control closing signal (YK _ HZ +) through a second resistor (R2), the third path is electrically connected with a closing remote sensing execution signal end (HZ _ JC), a pin 4 of the first optical coupler (U1) is divided into three paths, the first path is electrically connected with a line breakage detection upper signal sending end (YX _ SOE), the second path is grounded through a pull-up resistor (R4) and a voltage (V3P3), and the second path is also connected with a capacitor (C2); the 3 feet of the first optical coupler (U1) are grounded; a pin 1 of the second optical coupler (U2) is electrically connected with a voltage (V3P3) through a fifth resistor (R5), a pin 2 of the second optical coupler (U2) is divided into two paths, the first path is electrically connected with a voltage (V3P3) through a sixth resistor (R6), and the second path is electrically connected with a broken line detection switching signal end (YK _ DXJC);

the open circuit detection circuit of the opening circuit comprises a seventh resistor (R7), one end of the seventh resistor (R7) is electrically connected with a signal end (FZ _ YB) of an opening pressing plate, the other end of the seventh resistor (R7) is divided into two paths, the first path is electrically connected with one end of a ninth resistor (R9), the second path is electrically connected with one end of a third capacitor (C3), the other end of the ninth resistor (R9) is electrically connected with a pin 1 of a third optocoupler (U3), a pin 2 of the third optocoupler (U3) is electrically connected with a pin 4 of a fourth optocoupler (U4), a pin 3 of the fourth optocoupler (U4) is divided into three paths, the first path is electrically connected with the other end of a third capacitor (C3), the second path is electrically connected with a remote control opening signal (YK _ FZ +) through an eighth resistor (R8), and the third path is electrically connected with a remote sensing execution signal end (FZ _ JC) of the opening circuit; the 4 pins of the third optocoupler (U3) are divided into three paths, the first path is electrically connected with a disconnection detection sending-up signal end (YX _ SOE), the second path is electrically connected with voltage (V3P3) through a pull-up resistor (R4), and the third path is grounded through a second capacitor (C2); a pin 1 of the fourth optical coupler (U4) is electrically connected with a voltage (V3P3) through a tenth resistor (R10), a pin 2 of the fourth optical coupler (U4) is divided into two paths, the first path is electrically connected with a voltage (V3P3) through a sixth resistor (R6), and the second path is electrically connected with a broken line detection switching signal end (YK _ DXJC);

and the disconnection detection uploading signal end (YX _ SOE) is communicated with one IO of the MCU.

2. The retractable control loop disconnection detecting circuit of claim 1, wherein a resistor in the control loop disconnection detecting circuit enables each optocoupler to be normally switched on, and a current in the control loop disconnection detecting circuit does not cause a coil driving contact of a primary device to be pulled in.

3. The retractable control loop disconnection detection circuit according to claim 1, wherein the other end of the third resistor (R3) is further electrically connected to the cathode of the first diode (D1), and the 3-pin of the second optocoupler (U2) is electrically connected to the anode of the first diode (D1); the other end of the ninth resistor (R9) is also electrically connected with the cathode of the second diode (D2), and the pin 3 of the fourth optocoupler (U4) is electrically connected with the anode of the second diode (D2).

4. The circuit for detecting disconnection of a retractable control loop according to claim 1, wherein 3 pins of the second optocoupler (U2) are grounded through a first TVS diode (Z1); and the 3 feet of the fourth optical coupler (U4) are grounded through a second TVS diode (Z2).

5. The retractable control loop disconnection detecting circuit of claim 1, wherein said voltage (V3P3) has a voltage value of 3.3V.

6. A retractable control loop disconnection detection circuit as claimed in claim 5, wherein said first capacitor (C1) and said third capacitor (C3) are both 0.1uF, and said second capacitor (C2) is 1000 pF.