Output module with broken line and short circuit detection function

Abstract

The invention discloses an output module with broken line and short circuit detection, which comprises a relay switching module, a detection loop and a main control module, the relay switching module and the detection loop are both connected with the main control module, and the detection loop comprises a DCDC isolation buck-boost module and a current detection module and has the capacity of detecting alternating current and direct current loads. And when a load loop is not closed, the device can detect open circuit and short circuit of the load. In addition, the system also has a self-learning capability, and the system can update and store threshold parameters of open circuit and short circuit in real time in a normal detection process. The output module with the broken line and short circuit detection function is further provided with a backflow protection module and / or a TVS interface protection module, and the stability and reliability of the output module with the broken line and short circuit detection function are further improved.

Description

Technical Field

[0001] The invention relates to an output module with disconnection and short circuit detection. Background Art

[0002] Traditional IO output modules do not have the ability to detect output disconnection or only support detection of the load status when the load is closed. Most of them only support detection of DC24V DC loads, which cannot meet the functions required by other industries such as ships. Summary of the invention

[0003] An object of the present invention is to provide an output module with disconnection and short circuit detection to solve one or more of the above problems.

[0004] The present invention describes an output module with disconnection and short circuit detection, including a relay switching module, a detection circuit and a main control module, the relay switching module and the detection circuit are connected to the main control module, the detection circuit includes a DCDC isolation buck-boost module and a current detection module, wherein The main control module is also connected to the load circuit. The main control module is used to process the main logic, which includes the state judgment of the detection circuit, the control of the relay switching module, and the monitoring and analysis of the load state information. The load state information includes the current and voltage conditions in the load circuit; The relay switching module is used to connect the detection circuit and the load circuit, and control the working status of the detection circuit and the load circuit; The DCDC isolation buck-boost module is used to provide a stable voltage source for the detection circuit. The design of the DCDC isolation buck-boost module can adjust the voltage under different load conditions to avoid the adverse effects of excessively high or low voltage on the detection circuit; The current detection module is used to monitor the current in the load circuit.

[0005] In some embodiments, The output module with disconnection and short circuit detection uses an isolated power supply to provide the detection reference voltage; The main control module includes a single chip microcomputer and an EEPROM, and the main control module also has a storage function and a self-learning function; The relay switching module adopts a single-pole double-throw relay; The output voltage range of the DCDC isolation buck-boost module is 2V-48V; The current detection module uses a linear optocoupler detection circuit to perform current detection.

[0006] In some embodiments, the relay switching module switches the load circuit to two connection modes, which are: mode 1, the load circuit is connected to a reference voltage for easy detection; mode 2, the load circuit is switched to a normal control mode; through the design of these two modes, the control and detection of the load are separated to ensure the accuracy of the detection.

[0007] In some embodiments, the operation method of the DCDC isolation buck-boost module is: When the detected load loop resistance is less than the preset resistance lower limit, the DCDC isolation buck-boost module will limit the voltage to the preset voltage lower limit; when the detected load loop resistance is greater than the preset resistance upper limit, the DCDC isolation buck-boost module will limit the voltage to the preset voltage upper limit.

[0008] In some embodiments, the lower limit of resistance is 50Ω, and the lower limit of voltage is 3V; the upper limit of resistance is 6ΚΩ, and the upper limit of voltage is 48V.

[0009] In some embodiments, the output module with disconnection and short circuit detection includes a communication module, which is connected to the main control module. The communication module is used to realize real-time data exchange between the output module with disconnection and short circuit detection and an external control system.

[0010] In some embodiments, the output module with disconnection and short circuit detection includes a circuit protection module, and the circuit protection module includes a backflow protection module and / or a TVS interface protection module. The backflow protection module is used to prevent the reverse electromotive force generated by the inductive load from damaging the circuit; The TVS interface protection module is used to protect the circuit from the influence of reverse electromotive force or surge current.

[0011] In some embodiments, the backflow protection module includes a relay. When the output module with disconnection and short circuit detection detects that the load circuit is about to be disconnected, the voltage source is first disconnected through the relay, and then the voltage source is reclosed after a preset time. This design can effectively prevent the impact of the reverse electromotive force generated by the inductive load on the circuit, and protect the stability and safety of the output module with disconnection and short circuit detection and the system using the module.

[0012] In some implementations, the preset duration is 500 ms.

[0013] The output module with disconnection and short circuit detection described in the present invention has the advantages of low cost and high reliability. The voltage of the load circuit can be an AC or DC load in the range of 24V-230V, which can cover common resistive or inductive loads on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A circuit diagram of a detection loop including a current detection module and a TVS interface protection module, etc., in some embodiments of the present invention; Figure 2 is a circuit diagram of a backflow protection module in some embodiments of the present invention; Figure 3 Schematic diagram of a circuit of a main control module in some embodiments of the present invention. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The contents and drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Combination Figures 1 to 3 The present embodiment discloses an output module with disconnection and short circuit detection, including a relay switching module, a detection circuit and a main control module, wherein the relay switching module and the detection circuit are connected to the main control module, and the output module includes a relay switching module, a detection circuit and a main control module. Figure 1 The detection circuit includes a DCDC isolation buck-boost module and a current detection module. The main control module is also connected to the load circuit. The main control module is used to process the main logic, which includes the state judgment of the detection circuit, the control of the relay switching module, and the monitoring and analysis of the load state information. The load state information includes the current and voltage conditions in the load circuit; The relay switching module is used to connect the detection circuit and the load circuit, and control the working status of the detection circuit and the load circuit; The DCDC isolation buck-boost module is used to provide a stable voltage source for the detection circuit. The design of the DCDC isolation buck-boost module can adjust the voltage under different load conditions to avoid the adverse effects of excessively high or low voltage on the detection circuit; The current detection module is used to monitor the current in the load circuit.

[0018] The output module with disconnection and short circuit detection adopts an isolated power supply to provide a detection reference voltage.

[0019] The main control module can be a single chip microcomputer and EEPROM, which can be combined with Figure 3As shown. The single-chip microcomputer is the core control unit of the output module with disconnection and short circuit detection and the system using the output module with disconnection and short circuit detection. It is responsible for processing the main logic, performing corresponding control operations according to the monitoring and analysis results of the load status information in the main logic, and has a self-learning function. Through the self-learning function, the output module with disconnection and short circuit detection and the system using the output module with disconnection and short circuit detection can dynamically adapt to different working environments and load changes, and update the detection threshold parameters in real time to ensure that the output module with disconnection and short circuit detection and the system using the module can always accurately determine whether the load is disconnected or short-circuited under different environments and load conditions. This dynamic adjustment can improve the system's adaptive ability, so that the output module with disconnection and short circuit detection can maintain a high level of detection accuracy and stability in different application scenarios, thereby preventing false alarms, missed alarms, etc. EEPROM is a non-volatile memory used to store key threshold parameters in the system detection process. The output module with disconnection and short circuit detection will adjust these parameters through self-learning ability and save them to EEPROM during daily operation to ensure that the output module with disconnection and short circuit detection can still work with the latest detection threshold after restart or power failure, thereby ensuring the accuracy of disconnection and short circuit detection and the continuous and reliable operation of the output module with disconnection and short circuit detection.

[0020] The above-mentioned relay switching module can adopt a single-pole double-throw relay, that is, one relay can control two different circuits (detection circuit and load circuit). The relay switching module switches the load circuit to two connection modes. The two connection modes are: Mode 1, when the single-pole double-throw relay is in the "no power" state, the load circuit is connected to the reference voltage mode for easy detection; Mode 2, when the single-pole double-throw relay is in the "power" state, the load circuit switches to the normal control mode; through the design of these two modes, the separation of load control and detection is realized to ensure the accuracy of detection.

[0021] The output voltage range of the above-mentioned DCDC isolation buck-boost module can be 2V-48V.

[0022] The operation method of the DCDC isolation buck-boost module can be: When the detected load loop resistance is less than the preset resistance lower limit (such as 50Ω), the DCDC isolation buck-boost module will limit the voltage to the preset voltage lower limit (such as 3V); when the detected load loop resistance is greater than the preset resistance upper limit (such as 6ΚΩ), the DCDC isolation buck-boost module will limit the voltage to the preset voltage upper limit (such as 48V).

[0023] The above current detection module can use a linear optocoupler detection circuit to perform current detection.

[0024] The output module with disconnection and short circuit detection includes a communication module, which is connected to the main control module. The communication module is used to realize real-time data exchange between the output module with disconnection and short circuit detection and an external control system.

[0025] In some specific implementations, the output module with disconnection and short circuit detection includes a circuit protection module, and the circuit protection module includes a backflow protection module and / or a TVS interface protection module.

[0026] The backflow protection module is used to prevent the reverse electromotive force generated by inductive loads (such as motors, coils, etc.) from damaging the circuit. The working principle of the backflow protection module is that the inductive load will generate a reverse electromotive force when it is disconnected. If this electromotive force is not protected, it may damage other electronic components in the system. By disconnecting the voltage source in advance and then closing the voltage source again later, the output module with disconnection and short-circuit detection can effectively prevent this reverse electromotive force from impacting the circuit ground, protecting the stability and safety of the output module with disconnection and short-circuit detection and the system using the module.

[0027] The TVS interface protection module is used to protect the circuit from reverse electromotive force or surge current. Surge current may suddenly increase due to lightning strikes, motor startup, etc. If it is not suppressed, it will cause damage to the output module with disconnection and short circuit detection and the system using the module. The TVS interface protection module absorbs surges and limits transient voltages by responding quickly, protecting the system from possible voltage spikes, thereby improving the system's anti-interference ability and reliability.

[0028] The backflow protection module can be composed of a relay, which can be specifically as follows: Figure 2 As shown, when the output module with line break short circuit detection detects that the load circuit is about to be disconnected, the voltage source is first disconnected through the relay, and then the voltage source is reclosed after a preset time (such as 500ms).

[0029] The above undisclosed matters can all be implemented using existing technologies, so they will not be elaborated here.

[0030] For ordinary technicians, several similar variations and improvements can be made without departing from the creative concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. An output module with disconnection and short circuit detection, characterized in that: It includes a relay switching module, a detection circuit and a main control module. The relay switching module and the detection circuit are connected to the main control module. The detection circuit includes a DCDC isolation buck-boost module and a current detection module. The main control module is also connected to the load circuit. The main control module is used to process the main logic, which includes the state judgment of the detection circuit, the control of the relay switching module, and the monitoring and analysis of the load state information. The load state information includes the current and voltage conditions in the load circuit; The relay switching module is used to connect the detection circuit and the load circuit, and control the working status of the detection circuit and the load circuit; The DCDC isolation buck-boost module is used to provide a stable voltage source for the detection circuit; The current detection module is used to monitor the current in the load circuit.

2. The output module with disconnection and short circuit detection according to claim 1, wherein: The output module with disconnection and short circuit detection uses an isolated power supply to provide the detection reference voltage; The main control module includes a single chip microcomputer and an EEPROM, and the main control module also has a storage function and a self-learning function; The relay switching module adopts a single-pole double-throw relay; The output voltage range of the DCDC isolation buck-boost module is 2V-48V; The current detection module uses a linear optocoupler detection circuit to perform current detection.

3. The output module with disconnection and short circuit detection according to claim 1 or 2, wherein: The relay switching module switches the load circuit to two connection modes, the two connection modes are: mode 1, the load circuit is connected to the reference voltage; mode 2, the load circuit is switched to the normal control mode.

4. The output module with disconnection and short circuit detection according to claim 1 or 2, wherein: The operation method of the DCDC isolation buck-boost module is: When the detected load loop resistance is less than the preset resistance lower limit, the DCDC isolation buck-boost module will limit the voltage to the preset voltage lower limit; when the detected load loop resistance is greater than the preset resistance upper limit, the DCDC isolation buck-boost module will limit the voltage to the preset voltage upper limit.

5. The output module with disconnection and short circuit detection according to claim 4, wherein: The lower limit value of resistance is 50Ω, and the lower limit value of voltage is 3V; the upper limit value of resistance is 6ΚΩ, and the upper limit value of voltage is 48V.

6. The output module with disconnection and short circuit detection according to claim 1 or 2, wherein: The output module with disconnection and short circuit detection includes a communication module, which is connected to the main control module. The communication module is used to realize real-time data exchange between the output module with disconnection and short circuit detection and an external control system.

7. The output module with disconnection and short circuit detection according to claim 1 or 2, wherein: The output module with disconnection and short circuit detection includes a circuit protection module, and the circuit protection module includes a backflow protection module and / or a TVS interface protection module. The backflow protection module is used to prevent the reverse electromotive force generated by the inductive load from damaging the circuit; The TVS interface protection module is used to protect the circuit from the influence of reverse electromotive force or surge current.

8. The output module with disconnection and short circuit detection according to claim 7, wherein: The backflow protection module includes a relay. When the output module with line break short circuit detection detects that the load circuit is about to be disconnected, the voltage source is first disconnected through the relay, and then the voltage source is reclosed after a preset time.

9. The output module with disconnection and short circuit detection according to claim 8, wherein: The default duration is 500ms.

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