CN212403379U - High-reliability control circuit suitable for forklift handle - Google Patents
High-reliability control circuit suitable for forklift handle Download PDFInfo
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- CN212403379U CN212403379U CN202021178508.8U CN202021178508U CN212403379U CN 212403379 U CN212403379 U CN 212403379U CN 202021178508 U CN202021178508 U CN 202021178508U CN 212403379 U CN212403379 U CN 212403379U
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Abstract
The utility model provides a high reliability control circuit suitable for fork truck handle, including power input protection circuit, it includes first self-resuming fuse, current limiting element, disposable fuse, suppresses surge component, suppresses reverse connection component and electric capacity; the first end of the first self-recovery fuse is connected with the positive electrode of a power supply, and the second end of the first self-recovery fuse is connected with the surge suppression element and the first end of the reverse connection suppression element; the first end of the disposable fuse is connected with the negative electrode of a power supply, and the second end of the disposable fuse is connected with the second ends of the surge suppression element and the reverse suppression element; and the first end of the current limiting element is connected with the anode of a power supply, and the second end of the current limiting element is connected with the capacitor. The utility model discloses a high reliability control circuit suitable for fork truck handle has the anti-surge and prevents the transposition function, prevents that fork truck control scheme board from burning out.
Description
Technical Field
The utility model relates to a fork truck control accessory technical field, concretely relates to high reliability control circuit suitable for fork truck handle.
Background
The fork truck handle is a control accessory for controlling a full-electric fork truck, a forklift and the like, the input voltage of a control circuit board of the fork truck handle is 24V version and 48V version, and the output signals comprise a speed regulation signal, an emergency reverse signal, a horn signal, a forward signal, a backward signal, a tortoise climbing signal, an ascending signal, a descending signal and the like. The existing forklift handle control circuit has the following defects that when the control circuit board is in short circuit at the moment of electrifying or an external circuit, all elements in the board are easy to be broken down and burnt.
SUMMERY OF THE UTILITY MODEL
In order to compensate the not enough of existence among the prior art, the utility model provides a high reliability control circuit suitable for fork truck handle has the anti-surge and prevents the reverse connection function, prevents that fork truck control circuit board from burning out.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high reliability control circuit suitable for use with a forklift handle, comprising:
the power input protection circuit comprises a first self-recovery fuse, a current limiting element, a disposable fuse, a surge suppression element, a reverse connection suppression element and a capacitor; the first end of the first self-recovery fuse is connected with the positive electrode of a power supply, and the second end of the first self-recovery fuse is connected with the surge suppression element and the first end of the reverse connection suppression element; the first end of the disposable fuse is connected with the negative electrode of a power supply, and the second end of the disposable fuse is connected with the second ends of the surge suppression element and the reverse suppression element; and the first end of the current limiting element is connected with the anode of a power supply, and the second end of the current limiting element is connected with the capacitor.
Furthermore, an internal power supply discrete circuit is also arranged, and the internal power supply discrete circuit comprises a second self-recovery fuse, a wide voltage stabilizing chip and a multi-path voltage stabilizing chip set; the first end of the second self-recovery fuse is connected with the second end of the first self-recovery fuse, and the second end of the second self-recovery fuse is connected with the first end of the wide voltage stabilizing chip; the second end of the wide voltage stabilizing chip is connected with the second end of the disposable fuse, and the third end of the wide voltage stabilizing chip is connected with the multi-path voltage stabilizing chip set.
Furthermore, a signal output protection circuit is also arranged, and the signal output protection circuit comprises a multi-path composite NPN circuit, a multi-path self-recovery fuse and a multi-path filter circuit; the first end of the multi-path composite NPN circuit is connected with the second end of the first self-recovery fuse, the second end of the multi-path composite NPN circuit is connected with the second end of the disposable fuse, and the third end of the multi-path composite NPN circuit is connected with the first end of the multi-path self-recovery fuse; and the second end of the multi-path self-recovery fuse is connected with the first end of the multi-path filter circuit.
Furthermore, the low-voltage control high-voltage circuit is further arranged and comprises a control chip, a power element and a first self-recovery protection element, the control chip is in signal connection with the multi-path voltage stabilizing chip set and the power element, the first end of the power element is connected with the second end of the capacitor, the second end of the power element is connected with the second end of the first self-recovery protection element, and the first self-recovery protection element outputs a rising or falling signal.
Furthermore, the multi-path voltage stabilizing chip set comprises at least two paths of second self-recovery protection elements and voltage stabilizing chips which are connected in parallel, the third end of the wide voltage stabilizing chip is connected with the voltage stabilizing chip through the second self-recovery protection elements, and the voltage stabilizing chip is connected with the control chip or the sensor.
Compared with the prior art, the utility model discloses following beneficial technological effect has:
(1) the utility model discloses contain power input protection circuit, its restrain surge component can absorb the surge electricity that the electricity produced in the twinkling of an eye, restrain the transposition component and can prevent the transposition to through the disconnection effect of first self-resuming fuse and disposable fuse when the heavy current, can prevent effectively that fork truck control scheme board from being burnt out because of too big electric current, guaranteed the reliability of power supply.
(2) The utility model comprises an internal power discrete circuit, a wide voltage stabilizing chip of which can allow wide voltage input, and has a wide voltage application range; each path of the multi-path voltage stabilizing chip set works independently, and even if one path is abnormal, the work of other paths is not influenced.
(3) The utility model discloses contain signal output protection circuit, have signal output a series of handle and protection such as overflow, excessive pressure, filtering, guaranteed signal output's high reliability.
(4) The utility model discloses contain low-voltage control high-voltage circuit, have with the effect of low-voltage control high voltage, improved fork truck handle's micro-gap switch's use reliability greatly.
Drawings
Figure 1 is a structural connection diagram of a high reliability control circuit suitable for fork truck handle.
Wherein: 1. a power input protection circuit; 2. an internal power discrete circuit; 3. a signal output protection circuit; 4. the low voltage controls the high voltage circuit.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many other forms without departing from the spirit or essential characteristics thereof, and it should be understood that the invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in figure 1, the high-reliability control circuit suitable for the forklift handle comprises a power input protection circuit 1, an internal power discrete circuit 2, a signal output protection circuit 3 and a low-voltage control high-voltage circuit 4.
The power input protection circuit 1 comprises a first self-recovery fuse, a current limiting element, a disposable fuse, a surge suppression element (TVS-SMAJ70CA diode), a reverse connection suppression element (M7 diode) and a capacitor (aluminum electrolytic capacitor 100V/100 uf). The first end of the first self-recovery fuse is connected with the positive electrode of the power supply, and the second end of the first self-recovery fuse is connected with the surge suppression element and the first end of the reverse suppression element; the first end of the disposable fuse is connected with the negative electrode of the power supply, and the second end of the disposable fuse is connected with the second ends of the surge suppression element and the reverse suppression element; the first end of the current limiting element is connected with the anode of the power supply, and the second end of the current limiting element is connected with the capacitor.
The surge suppressing element is used for absorbing surge electricity generated at the moment of power-on, and when the surge current flows over 80% of the bearing current of the element, the first self-recovery fuse is disconnected. The reverse connection inhibiting element is used for preventing the reverse connection of the power supply, and when the input current exceeds 70% of the bearing current of the element, the first self-recovery fuse is disconnected. When the input current exceeds 300% of the current of the surge suppression element or the reverse connection suppression element, the disposable fuse is opened to protect the circuit in the board. The current limiting element is used for limiting the maximum power output of the post-stage circuit, and the current limiting element is provided with capacitance filtering, so that the normal work of an internal power supply cannot be interfered.
The internal power discrete circuit 2 comprises a second self-recovery fuse, a wide voltage stabilizing chip (XL7005) and a multi-path voltage stabilizing chip set. The first end of the second self-recovery fuse is connected with the second end of the first self-recovery fuse, and the second end of the second self-recovery fuse is connected with the first end of the wide voltage stabilizing chip. The second end of the wide voltage stabilizing chip is connected with the second end of the disposable fuse. The multi-path voltage-stabilizing chip set comprises three paths of second self-recovery protection elements and voltage-stabilizing chips which are connected in parallel, and the third end of each wide voltage-stabilizing chip is connected with the voltage-stabilizing chip (AMS1117-5.0 or HTC7133) through the second self-recovery protection elements. The first path of voltage stabilizing chip is connected with the first sensor, the second path of voltage stabilizing chip is connected with the control chip, the third path of voltage stabilizing chip is connected with the second sensor, and the first sensor and the second sensor are respectively in signal connection with the control chip. The wide voltage stabilizing chip is also connected with the control chip through the amplifying follower.
The wide voltage regulator chip 3 provides power for the multi-path voltage regulator chip set, and when the total current of the multi-path voltage regulator chip set is abnormal and exceeds 25% of the chip device, the second self-recovery fuse is disconnected. All paths of elements in the rear-stage multi-path voltage-stabilizing chip set work independently, wherein one path of elements is automatically protected abnormally and does not influence the working conditions of other paths.
The signal output protection circuit comprises a multi-path composite NPN (negative-positive-negative) circuit, a multi-path self-recovery fuse and a multi-path filter circuit (NFM41CC223R2A3L filter). The first end of the multi-path composite NPN circuit is connected with the second end of the first self-recovery fuse through the power controller, the second end of the multi-path composite NPN circuit is connected with the second end of the disposable fuse, and the third end of the multi-path composite NPN circuit is connected with the first end of the multi-path self-recovery fuse. And the second end of the multi-path self-recovery fuse is connected with the first end of the multi-path filter circuit and is in signal connection with the control chip. The multipath filter circuit is used for outputting a control signal.
After the signal output protection circuit is electrified, the control chip controls the on-off of the main power supply of the NPN circuit by detecting the feedback condition of the multiple paths of self-recovery fuses. The signal output is fed back to the control chip by the multi-path self-recovery fuse to confirm the signal output condition, and then the output signals (forward signal, backward signal, tortoise-climbing signal, emergency reverse signal, speed regulation signal and the like) are processed by the path filter circuit. When the signal output current or the backward flow current exceeds 25% of the device, the multi-path self-recovery fuse is switched off; and when the backward flow voltage exceeds the input voltage, the output is automatically stopped.
The low-voltage control high-voltage circuit 4 comprises a control chip, a power element (IRF5410 capacitor) and a first self-recovery protection element (PPTC 72V/1.35A self-recovery fuse). The control chip is in signal connection with the multi-path voltage stabilizing chip set and the power element, the first end of the power element is connected with the second end of the capacitor, the second end of the power element is connected with the second end of the first self-recovery protection element, and the first self-recovery protection element outputs a rising or falling signal.
The control chip drives the power element by acquiring a microswitch signal of the forklift handle and outputs a signal through the first self-recovery protection element, so that the effect of controlling high-point voltage by low voltage is realized, and the service life of the forklift handle microswitch is effectively protected.
Although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications, equivalents, improvements and the like can be made in the technical solutions of the foregoing embodiments or in some technical features of the foregoing embodiments, but all modifications, equivalents, improvements and the like within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. The utility model provides a high reliability control circuit suitable for fork truck handle which characterized in that:
the power input protection circuit comprises a first self-recovery fuse, a current limiting element, a disposable fuse, a surge suppression element, a reverse connection suppression element and a capacitor; the first end of the first self-recovery fuse is connected with the positive electrode of a power supply, and the second end of the first self-recovery fuse is connected with the surge suppression element and the first end of the reverse connection suppression element; the first end of the disposable fuse is connected with the negative electrode of a power supply, and the second end of the disposable fuse is connected with the second ends of the surge suppression element and the reverse suppression element; and the first end of the current limiting element is connected with the anode of a power supply, and the second end of the current limiting element is connected with the capacitor.
2. The highly reliable control circuit for a forklift handle as set forth in claim 1, wherein: the internal power supply discrete circuit comprises a second self-recovery fuse, a wide voltage stabilizing chip and a multi-path voltage stabilizing chip set; the first end of the second self-recovery fuse is connected with the second end of the first self-recovery fuse, and the second end of the second self-recovery fuse is connected with the first end of the wide voltage stabilizing chip; the second end of the wide voltage stabilizing chip is connected with the second end of the disposable fuse, and the third end of the wide voltage stabilizing chip is connected with the multi-path voltage stabilizing chip set.
3. The highly reliable control circuit for a forklift handle as set forth in claim 2, wherein: the signal output protection circuit comprises a multi-path composite NPN circuit, a multi-path self-recovery fuse and a multi-path filter circuit; the first end of the multi-path composite NPN circuit is connected with the second end of the first self-recovery fuse, the second end of the multi-path composite NPN circuit is connected with the second end of the disposable fuse, and the third end of the multi-path composite NPN circuit is connected with the first end of the multi-path self-recovery fuse; and the second end of the multi-path self-recovery fuse is connected with the first end of the multi-path filter circuit.
4. The highly reliable control circuit for a forklift handle as set forth in claim 3, wherein: the low-voltage control high-voltage circuit comprises a control chip, a power element and a first self-recovery protection element, wherein the control chip is in signal connection with the multi-path voltage stabilizing chip set and the power element, the first end of the power element is connected with the second end of the capacitor, the second end of the power element is connected with the second end of the first self-recovery protection element, and the first self-recovery protection element outputs a rising or falling signal.
5. The highly reliable control circuit for a forklift handle as set forth in claim 4, wherein: the multi-path voltage stabilizing chip set comprises at least two paths of second self-recovery protection elements and voltage stabilizing chips which are connected in parallel, the third end of the wide voltage stabilizing chip is connected with the voltage stabilizing chip through the second self-recovery protection elements, and the voltage stabilizing chip is connected with the control chip or the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021178508.8U CN212403379U (en) | 2020-06-23 | 2020-06-23 | High-reliability control circuit suitable for forklift handle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021178508.8U CN212403379U (en) | 2020-06-23 | 2020-06-23 | High-reliability control circuit suitable for forklift handle |
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| Publication Number | Publication Date |
|---|---|
| CN212403379U true CN212403379U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021178508.8U Active CN212403379U (en) | 2020-06-23 | 2020-06-23 | High-reliability control circuit suitable for forklift handle |
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| Country | Link |
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| CN (1) | CN212403379U (en) |
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- 2020-06-23 CN CN202021178508.8U patent/CN212403379U/en active Active
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| GR01 | Patent grant | ||
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Effective date of registration: 20221009 Address after: Heshui Industrial Zone, Heshui Town, Xingning City, Meizhou City, Guangdong Province, 514000 Patentee after: GUANGDONG JINYAN ELECTRIC TECHNOLOGY CO.,LTD. Address before: Bing Cun Zhen Tian tou Cun, Meixian District, Meizhou City, Guangdong Province 514762 Patentee before: GUANGDONG JINYAN PRECISION TECHNOLOGY CO.,LTD. |
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| TR01 | Transfer of patent right |