Protection circuit and feed empty overflow detection circuit

Abstract

The utility model discloses a protection circuit and a feed empty overflow detection circuit, the protection circuit comprises a first voltage clamping tube and an anti-reverse diode, the first voltage clamping tube can clamp a voltage at a first end of the first voltage clamping tube at a first clamping voltage when a surge voltage input from a probe is greater than a first breakdown voltage, and the first clamping voltage is greater than a second breakdown voltage; therefore, when the first clamping voltage is smaller than the reverse breakdown voltage of the anti-reverse diode, the anti-reverse diode reversely intercepts the first clamping voltage. On the basis, when an animal or an operator mistakenly touches the probe, surge voltage input at the probe can be clamped and reversely cut off by the first voltage clamping tube and the anti-reverse diode, so that the surge voltage is prevented from being input to a control chip in the feed empty overflow detection circuit to cause overvoltage damage to the control chip; and the normal work of the feed empty overflow detection circuit is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit protection, especially relates to a protection circuit and feed empty overflow detection circuit. BACKGROUND

[0002] In the field of livestock breeding, it is necessary to detect feed empty overflow, that is, to detect the remaining amount of feed in the feed trough, so as to determine whether to continue to feed. In order to detect feed empty overflow in the prior art, a probe for detecting the remaining amount of feed is usually provided in the feed trough. After the probe is powered on by the control chip, the remaining amount of feed in the feed trough is determined by detecting the voltage on the probe. Specifically, if there is feed remaining in the feed trough after the probe is powered on, the probe will be grounded through the feed in the feed trough, forming a voltage drop. If the control chip detects a voltage drop on the probe, there is feed remaining in the feed trough. If no voltage drop is detected on the probe, there is no feed remaining in the feed trough, and feeding needs to be performed. Figure 1 As shown in Figure 1 The feed empty overflow detection circuit in the prior art is a control chip that outputs voltage to the probe through the voltage output end to power on, and detects the voltage on the probe obtained through the detection end to determine whether there is feed remaining in the feed trough.

[0003] However, since the probe is provided in the feed trough, if an animal or an operator carrying static electricity mistakenly touches the probe, a surge voltage may be input from the probe, causing a surge voltage impact on the control chip, resulting in an overvoltage failure of the control chip and preventing normal feed empty overflow detection, which affects normal feeding. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a protection circuit and a feed empty overflow detection circuit. When an animal or an operator mistakenly touches the probe, the surge voltage input at the probe will be clamped and reversed by the first voltage clamping tube and the anti-reverse diode, thereby avoiding the input of the surge voltage to the control chip in the feed empty overflow detection circuit, preventing overvoltage damage to the control chip, and ensuring the normal operation of the feed empty overflow detection circuit.

[0005] To solve the above technical problems, the utility model provides a protection circuit applied to a feed empty overflow detection circuit, comprising:

[0006] A first voltage clamping tube with a first end connected to the probe and a second end grounded, for clamping the voltage at the first end to a first clamping voltage when the surge voltage input from the probe is greater than a first breakdown voltage;

[0007] The input end is connected with the voltage output end and the detection end of a control chip in the feed emptying detection circuit, the output end is connected with an anti-reverse diode of the probe, and the anti-reverse diode is used for intercepting the first clamping voltage in reverse when the voltage of the output end is less than the reverse breakdown voltage of the anti-reverse diode; the first clamping voltage is less than the reverse breakdown voltage.

[0008] Preferably, further comprising:

[0009] The first end is connected with the input end of the anti-reverse diode, and the second end is grounded; the second voltage clamping tube is used for clamping the voltage of the first end to the second clamping voltage when the surge voltage input from the probe is greater than the avalanche voltage of the first voltage clamping tube, and the second clamping voltage is less than the first clamping voltage.

[0010] The first voltage clamping tube is further used for being broken down when the surge voltage input from the probe is greater than the avalanche voltage, so that the anti-reverse diode is broken down in reverse by the surge voltage; and the avalanche voltage is greater than the reverse breakdown voltage.

[0011] Preferably, further comprising:

[0012] The first end is connected with the input end of the anti-reverse diode, and the second end is connected with the detection end of the control chip; the first current limiting resistor is used for reducing the current input to the detection end of the control chip to be less than a first preset protection current.

[0013] The first end is grounded, and the second end is connected with the first end of the first current limiting resistor; the third voltage clamping tube is used for clamping the voltage of the second end to a third clamping voltage, and the third clamping voltage is less than the second clamping voltage.

[0014] Preferably, further comprising:

[0015] The first end is connected with the input end of the anti-reverse diode, and the second end is connected with the voltage output end of the control chip; the second current limiting resistor is used for reducing the current input to the voltage output end of the control chip to be a second preset protection current.

[0016] To solve the above technical problems, the utility model provides a kind of feed emptying detection circuit, including the protection circuit as described above, further comprising:

[0017] The voltage output end is connected with the first end of the protection circuit, and the detection end is connected with the second end of the protection circuit; the control chip is used for outputting detection voltage to probe, and determining the remaining amount of feed in feed trough based on the voltage on the probe;

[0018] The probe is connected with the third end of the protection circuit, and is used for being grounded by the feed in the feed trough when there is remaining feed in the feed trough.

[0019] Preferably, further comprising:

[0020] A prompt circuit connected with the prompt signal output end of the control chip, used for prompting the feed remaining amount in the feed trough based on the control of the control chip.

[0021] Preferably, the prompt circuit comprises:

[0022] A sound prompt circuit, used for soundly prompting the feed remaining amount in the feed trough based on the control of the control chip.

[0023] Preferably, the sound prompt circuit is a loudspeaker or a buzzer.

[0024] Preferably, the prompt circuit comprises:

[0025] A light prompt circuit, used for lightly prompting the feed remaining amount in the feed trough based on the control of the control chip.

[0026] Preferably, the light prompt circuit is a display screen or an LED lamp.

[0027] The application provides a protection circuit and a feed emptying detection circuit, the protection circuit comprising a first voltage clamping tube and an anti-reverse diode, the first voltage clamping tube being capable of clamping the voltage at the first end thereof to a first clamping voltage when the surge voltage input from a probe is greater than a first breakdown voltage, so that the anti-reverse diode reversely intercepts the first clamping voltage when the first clamping voltage is less than a reverse breakdown voltage of the anti-reverse diode. Based on this, when an animal or an operator mistakenly contacts the probe, the surge voltage input at the probe is clamped and reversely cut off by the first voltage clamping tube and the anti-reverse diode, so that the surge voltage is prevented from being input to a control chip in the feed emptying detection circuit, overvoltage damage of the control chip is avoided, and normal work of the feed emptying detection circuit is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0029] Figure 1 A feed emptying detection circuit in the prior art;

[0030] Figure 2 A structural schematic diagram of a protection circuit provided by the present application;

[0031] Figure 3The utility model provides a kind of feed empty spill detection circuit's structural diagram. DETAILED DESCRIPTION

[0032] The utility model discloses a kind of protection circuit and feed empty spill detection circuit, when animal or operator miscontact probe, the surge voltage input at probe is clamped and reversed cut-off by first voltage clamping tube and anti-reverse diode, to avoid surge voltage input to control chip in feed empty spill detection circuit, cause the overvoltage damage of control chip, ensure the normal work of feed empty spill detection circuit.

[0033] To make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described in the following with the drawings in the utility model embodiment, obviously, the described embodiment is part of the embodiment of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the protection scope of the utility model.

[0034] Please refer to Figure 2 , Figure 2 The utility model provides a kind of protection circuit's structural diagram, this circuit is applied to feed empty spill detection circuit, including:

[0035] The first end is connected with probe 2, the second end ground first voltage clamping tube D11, for when the surge voltage input from probe 2 is greater than first breakdown voltage, the voltage of first end of itself is clamped at first clamping voltage;

[0036] Input end is connected with the voltage output end and detection end of control chip 1 in feed empty spill detection circuit, output end is connected with the anti-reverse diode D2 of probe 2, for when the voltage of its output end is less than the reverse breakdown voltage of itself, first clamping voltage is reversed and intercepted;First clamping voltage is less than reverse breakdown voltage.

[0037] As probe 2 in feed empty spill detection circuit is installed in feed trough, when there is animal close to feed trough, staff is thrown feed or cleans up feed trough, possibly miscontact probe 2, animal and staff possibly carry static electricity, when miscontact probe 2, possibly cause from probe 2 input surge voltage, if surge voltage is directly input to control chip 1, will cause control chip 1 overvoltage damage, therefore, the application designs a kind of protection circuit applied to feed empty spill detection circuit.

[0038] Specifically, the protection circuit is provided with the first voltage clamping tube D11 and the anti-reverse diode D2. When the surge voltage is input from the probe 2, if the surge voltage is greater than the first breakdown voltage of the first voltage clamping tube D11, at this time, the first voltage clamping tube D11 is converted from high impedance performance to low impedance performance, and the surge voltage is led to the ground, so as to clamp the voltage at the first end to the first clamping voltage, avoiding the impact of the large surge voltage on the anti-reverse diode D2.

[0039] Because the anti-reverse diode D2 is also provided, when the first clamping voltage is less than the reverse breakdown voltage, the first clamping voltage is intercepted in reverse, further avoiding the impact of the first clamping voltage on the control chip 1, so as to realize the protection of the control chip 1 when the surge voltage is input from the probe 2.

[0040] The first voltage clamping tube D11 can be but is not limited to a TVS tube (Transient Voltage Suppressor, transient voltage suppression diode). The TVS tube is a kind of overvoltage protection device with bidirectional voltage stabilization characteristics and bidirectional negative resistance characteristics, similar to a pressure sensitive resistor. It is applied in various AC and DC power supply circuits to suppress transient overvoltage. When the surge voltage appears in the protected circuit, the TVS tube can quickly Zener breakdown, and changes from high resistance state to low resistance state, so as to shunt and clamp the surge voltage, thereby protecting the elements in the circuit from being damaged by the transient surge voltage. The first voltage clamping tube D11 can also be selected as a TVS tube with a model of SMBJ24CA, and the corresponding first clamping voltage is 28V. The present application is not limited to this, and can be selected according to actual needs.

[0041] The anti-reverse diode D2 can be selected as a diode with a model of SS36, and the reverse breakdown voltage is 36V, which can intercept the surge voltage less than 36V in reverse, reducing the impact on the control chip 1. Of course, the present application is not limited to this.

[0042] In summary, when the animal or the operator mistakenly contacts the probe 2, the surge voltage input from the probe 2 will be clamped and reversed by the first voltage clamping tube D11 and the anti-reverse diode D2, thereby avoiding the input of the surge voltage to the control chip 1 in the feed overflow detection circuit, causing the overvoltage damage of the control chip 1, and ensuring the normal work of the feed overflow detection circuit.

[0043] On the basis of the above embodiment:

[0044] As a preferred embodiment, it further includes:

[0045] The first end is connected with the input end of the anti-reverse diode D2, and the second end is connected with the ground of the second voltage clamping tube D12. The second voltage clamping tube D12 is used for clamping the voltage of the first end at the second clamping voltage when the surge voltage input from the probe 2 is greater than the avalanche voltage of the first voltage clamping tube D11, and the second clamping voltage is less than the first clamping voltage.

[0046] The first voltage clamping tube D11 is also used for being broken down when the surge voltage input from the probe 2 is greater than the avalanche voltage of the first voltage clamping tube D11, so that the anti-reverse diode D2 is reversely broken down. The avalanche voltage is greater than the reverse breakdown voltage.

[0047] If the surge voltage input at the probe 2 is too large and greater than the avalanche voltage of the first voltage clamping tube D11, the impedance of the first voltage clamping tube D11 approaches to 0, and the first end cannot be clamped. If the surge voltage is greater than the reverse breakdown voltage of the anti-reverse diode D2, the anti-reverse diode D2 is also broken down, and the input end voltage of the anti-reverse diode D2 is the surge voltage, which may also cause the control chip 1 to be damaged.

[0048] Therefore, the second voltage clamping tube D12 is further arranged in the embodiment. When the anti-reverse diode D2 is reversely broken down, although the first voltage clamping tube D11 does not perform voltage division, it performs current division, and part of the energy of the surge voltage is grounded. Therefore, although the voltage divided by the second voltage clamping tube D12 is large, the actual energy is small. In addition, the second breakdown voltage of the second voltage clamping tube D12 is less than the first breakdown voltage of the first voltage clamping tube D11, and the current division of the second voltage clamping tube D12 is large, so that the voltage of the first end can be clamped at the second clamping voltage which is less than the first clamping voltage, thereby further protecting the control chip 1.

[0049] It should be noted that the second voltage clamping tube D12 can also be a TVS tube, and the model thereof can be SMBJ6.5CA. Correspondingly, the second clamping voltage is 10V, which greatly reduces the voltage input to the control chip 1. Of course, the present application is not limited in this regard.

[0050] As a preferred embodiment, the application further comprises:

[0051] The first end is connected with the input end of the anti-reverse diode D2, and the second end is connected with the detection end of the control chip 1. The first current limiting resistor R1 is used for reducing the current input to the detection end of the control chip 1 to be less than the first preset protection current.

[0052] The first end is connected with the ground, and the second end is connected with the first end of the first current limiting resistor R1. The third voltage clamping tube D13 is used for clamping the voltage of the second end at the third clamping voltage, and the third clamping voltage is less than the second clamping voltage.

[0053] In the application, the first current limiting resistor R1 is arranged between the anti-reverse diode D2 and the detection end of the control chip 1, so that the current and voltage input to the detection end of the control chip 1 can be further reduced, and the control chip 1 is further protected; in addition, the third voltage clamping tube D13 is arranged, and the voltage of the detection end of the control chip 1 is clamped to the third clamping voltage after the current limiting treatment of the first current limiting resistor R1, so that the voltage input to the control chip 1 is further reduced.

[0054] The third voltage clamping tube D13 can also be a TVS tube, and the model thereof can be PESD3V3; accordingly, the second clamping voltage is 3.3V, and the voltage input to the control chip 1 is greatly reduced, of course, the application is not limited to this.

[0055] The first current limiting resistor R1 can be a resistor of 1KΩ, and the application is not limited to this.

[0056] As a preferred embodiment, the application further comprises:

[0057] The first end is connected with the input end of the anti-reverse diode D2, and the second end is connected with the voltage output end of the control chip 1; the second current limiting resistor R2 is arranged between the anti-reverse diode D2 and the voltage output end of the control chip 1, and is used for reducing the current input to the voltage output end of the control chip 1 to the second preset protection current.

[0058] In the embodiment, the second current limiting resistor R2 is arranged between the anti-reverse diode D2 and the voltage output end of the control chip 1, and is used for limiting the current and voltage input to the voltage output end of the control chip 1, so that the impact on the voltage output end is reduced.

[0059] The second current limiting resistor R2 can be a resistor of 100KΩ, and can protect the voltage output end when there is a surge voltage input from the probe 2, and can also reduce the voltage output from the voltage output end to the probe 2, so as to protect the probe 2 and prolong the service life of the probe 2.

[0060] Please refer to Figure 3 , Figure 3 The utility model provides a kind of feed emptying detection circuit's structural diagram, the circuit, including the protection circuit as described above, further include:

[0061] The voltage output end is connected with the first end of the protection circuit, and the detection end is connected with the second end of the protection circuit; the control chip 1 is used for outputting detection voltage to the probe 2, and determining the remaining amount of feed in the feed trough based on the voltage on the probe 2;

[0062] The probe 2 is connected with the third end of the protection circuit, and is used for grounding through the feed in the feed trough when there is feed remaining in the feed trough.

[0063] The feed residual detection circuit in the application has the beneficial effects of the above-mentioned protection circuit. In addition, the control chip 1 outputs a detection voltage to the probe 2 through the voltage output end. The detection voltage is output to the probe 2 through the anti-reverse diode D2. If there is feed remaining in the feed trough, the probe 2 will pass through the feed ground. The detection end can detect whether there is a voltage drop on the probe 2, that is, whether there is a voltage drop at the input end of the anti-reverse diode D2. If there is, there is feed remaining in the feed trough. If there is no voltage drop, there is no feed remaining. In addition, the control chip 1 can also detect the size of the voltage to determine the amount of feed remaining in the feed trough, so as to determine whether to continue to feed the feed and the amount of feed.

[0064] As a preferred embodiment, it further comprises:

[0065] The prompt circuit connected with the prompt signal output end of the control chip 1 is used for prompting the amount of feed remaining in the feed trough based on the control of the control chip 1.

[0066] In the embodiment, the prompt circuit is further arranged to prompt the amount of feed remaining in the feed trough. The staff can know whether there is feed remaining in the feed trough according to the prompt of the prompt circuit, so as to feed the feed when the amount of feed remaining in the feed trough is low. In addition, the speed of the animals eating the feed can be known according to the amount of feed remaining, so as to estimate the health status of the animals.

[0067] As a preferred embodiment, the prompt circuit comprises:

[0068] The sound prompt circuit is used for soundly prompting the amount of feed remaining in the feed trough based on the control of the control chip 1.

[0069] The prompt circuit in the embodiment can but is not limited to comprise the sound prompt circuit. The sound prompt circuit can soundly prompt the staff. If the staff is not on site, it can also be determined whether to feed the feed according to the prompt of the sound prompt circuit.

[0070] As a preferred embodiment, the sound prompt circuit is a loudspeaker or a buzzer.

[0071] The sound prompt circuit can but is not limited to be a loudspeaker or a buzzer. The loudspeaker can play different prompt sounds, such as insufficient feed remaining, to be fed, or too much feed remaining, please pay attention to the state of the animals. The buzzer frequency can be set to prompt, such as three continuous sounds of the buzzer, which is a prompt of insufficient feed remaining in the feed trough. Four continuous sounds of the buzzer are a prompt of too much feed remaining in the feed trough. The loudspeaker and the buzzer can clearly soundly prompt and have low cost. Of course, the application is not limited in this regard.

[0072] As a preferred embodiment, the prompt circuit comprises:

[0073] A light prompting circuit is arranged to prompt the remaining amount of feed in the feed trough based on the control of the control chip 1.

[0074] The prompting circuit in the present application can be a light prompting circuit, and if the environment is relatively noisy, the staff can determine the remaining amount of feed in the feed trough through the light prompting circuit.

[0075] As a preferred embodiment, the light prompting circuit is a display screen or an LED lamp.

[0076] The light prompting circuit can be but is not limited to a display screen or an LED lamp, the display screen can clearly display the specific remaining amount of feed in the feed trough, and the staff can check the remaining amount of feed in multiple feed troughs through one display screen. An LED lamp can be arranged beside each feed trough, and when the LED lamp is green, the remaining amount of feed in the feed trough is relatively large, when the LED lamp is red, the remaining amount of feed in the feed trough is relatively small, and the feed needs to be fed, and when the LED lamp is not lit, the remaining amount of feed in the feed trough is moderate.

[0077] The display screen can clearly display the remaining amount of feed in each feed trough, the LED lamp can display the remaining amount of feed in the feed trough corresponding to the LED lamp, the prompt is clear, and the cost is relatively low, and the selection can be made according to the actual demand, which is not limited in the present application.

[0078] It should be noted that the relative terms, such as first and second, and the like, are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements, but also includes other elements not expressly listed, or other elements inherent in such process, method, article, or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0079] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection circuit, characterized by, The application is applied to a feed emptying detection circuit, comprising: A first voltage clamping tube with a first end connected with a probe and a second end grounded, used for clamping the voltage of the first end at a first clamping voltage when the surge voltage input from the probe is greater than a first breakdown voltage; An anti-reverse diode with an input end connected with a voltage output end and a detection end of a control chip in the feed emptying detection circuit and an output end connected with the probe, used for intercepting the first clamping voltage in reverse when the voltage of the output end is less than a reverse breakdown voltage of the anti-reverse diode; the first clamping voltage is less than the reverse breakdown voltage.

2. The protection circuit of claim 1, wherein, Further comprising: A second voltage clamping tube with a first end connected with the input end of the anti-reverse diode and a second end grounded, used for clamping the voltage of the first end at a second clamping voltage when the surge voltage input from the probe is greater than an avalanche voltage of the first voltage clamping tube, the second clamping voltage being less than the first clamping voltage; The first voltage clamping tube is further used for being broken down when the surge voltage input from the probe is greater than the avalanche voltage, so that the anti-reverse diode is broken down in reverse by the surge voltage; The avalanche voltage is greater than the reverse breakdown voltage.

3. The protection circuit of claim 2, wherein, Further comprising: A first current limiting resistor with a first end connected with the input end of the anti-reverse diode and a second end connected with the detection end of the control chip, used for reducing the current input to the detection end of the control chip to be less than a first preset protection current; A third voltage clamping tube with a first end grounded and a second end connected with the first end of the first current limiting resistor, used for clamping the voltage of the second end at a third clamping voltage, the third clamping voltage being less than the second clamping voltage.

4. The protection circuit of claim 1, wherein, Further comprising: A second current limiting resistor with a first end connected with the input end of the anti-reverse diode and a second end connected with the voltage output end of the control chip, used for reducing the current input to the voltage output end of the control chip to be a second preset protection current.

5. A feed spill detection circuit, comprising: The protection circuit comprises the protection circuit according to any one of claims 1-4, further comprising: A control chip with a voltage output end connected with the first end of the protection circuit and a detection end connected with the second end of the protection circuit, used for outputting a detection voltage to a probe, collecting and determining the remaining amount of feed in a feed trough based on the voltage on the probe; A probe connected with a third end of the protection circuit, used for being grounded through the feed in the feed trough when there is feed remaining in the feed trough.

6. The feed spill detection circuit of claim 5, wherein, Further comprising: A prompt circuit connected with a prompt signal output end of the control chip, used for prompting the remaining amount of feed in the feed trough based on the control of the control chip.

7. The feed spill detection circuit of claim 6, wherein, The prompt circuit comprises: An audio prompt circuit, used for audio prompting the remaining amount of feed in the feed trough based on the control of the control chip.

8. The feed spill detection circuit of claim 7, wherein, The audio prompt circuit is a loudspeaker or a buzzer.

9. The feed spill detection circuit of claim 6, wherein, The prompt circuit comprises: A light prompt circuit, used for light prompting the remaining amount of feed in the feed trough based on the control of the control chip.

10. The feed spill detection circuit of claim 9, wherein, The light prompt circuit is a display screen or an LED lamp.

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