Electronic accessory power supply circuit for mining lithium battery electric forklift

Abstract

The utility model relates to an electronic accessory power supply circuit for a mine lithium battery electric forklift, and relates to the technical field of mine truck electronic accessory power supply. The system comprises a series composite amplification circuit connected with a low-voltage vehicle-mounted power supply V1 and a high-voltage vehicle-mounted power supply V2, a capacitor C1 and a capacitor C2 are connected in parallel between the direct-current output of the series composite amplification circuit and the ground, the direct-current output of the series composite amplification circuit is electrically connected with a full-bridge inverter circuit, the output of the full-bridge inverter circuit is connected with a transmitting end LC resonance circuit, and the transmitting end LC resonance circuit is electrically connected with the high-voltage vehicle-mounted power supply V2. The transmitting end LC resonance circuit is coupled with the receiving end LC resonance circuit, the receiving end LC resonance circuit is connected with the rectifier bridge D1, the output of the rectifier bridge D1 is connected with the capacitor C5, and the capacitor C5 is connected with the power input end of the electronic accessory for the mining lithium battery electric forklift. Wireless power supply for electronic accessories of the mining lithium battery electric forklift is supported, the electronic accessories can be replaced in an electrified mode during operation and maintenance, it is not needed to worry about discharge sparks, efficiency is guaranteed, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for electronic parts of mining vehicles, in particular to a power supply circuit for electronic parts of a mining lithium battery electric shovel truck. Background Art

[0002] The operational safety of lithium battery electric shovels for mining has always been the focus of lithium battery electric shovels for mining, especially in coal mine operation scenarios. For the safety of lithium battery electric shovels for mining, gas detection sensors, air pressure sensors, temperature sensors and other electronic accessories are introduced in the design process to sense the complex operating environment of coal mines and ensure that safety problems in the operating environment can be discovered in a timely manner. To ensure safety, when the electronic accessories of lithium battery electric shovels for mining need to be repaired, they generally need to be shut down for maintenance to avoid dangers such as discharge sparks during maintenance. This results in even small accessory problems requiring shutdown, affecting efficiency. Therefore, a power supply circuit for electronic accessories for lithium battery electric shovels for mining is needed to support non-stop and safe electronic accessory operation and maintenance. Utility Model Content

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the utility model provides an electronic accessory power supply circuit for a mining lithium battery electric shovel loader.

[0004] The utility model provides a power supply circuit for electronic accessories of a lithium battery electric shovel truck for mining, comprising: a series composite amplifier circuit connected to a low-voltage vehicle power supply V1 and a high-voltage vehicle power supply V2, a capacitor C1 and a capacitor C2 are connected in parallel between a DC output of the series composite amplifier circuit and ground, a DC output of the series composite amplifier circuit is electrically connected to a full-bridge inverter circuit, an output of the full-bridge inverter circuit is connected to a transmitting end LC resonant circuit, the transmitting end LC resonant circuit is coupled to a receiving end LC resonant circuit, the receiving end LC resonant circuit is connected to a rectifier bridge D1, an output of the rectifier bridge D1 is connected to a capacitor C5, and the capacitor C5 is connected to a power input end of the electronic accessories of the lithium battery electric shovel truck for mining.

[0005] Furthermore, the series composite amplifier circuit includes: an operational amplifier U1, the non-inverting input terminal of the operational amplifier U1 is connected to the low-voltage vehicle power supply V1 via a resistor R1, the inverting input terminal of the operational amplifier U1 is grounded, the output terminal of the operational amplifier U1 is connected to an inverting proportional circuit, the output of the inverting proportional circuit is fed back to the non-inverting input terminal of the operational amplifier U1 via a resistor R3, the resistor R3 is connected in parallel with a capacitor C7, and the inverting proportional circuit is powered by a high-voltage vehicle power supply V2.

[0006] Furthermore, the inverting input terminal of the operational amplifier U1 is grounded via a resistor R2, and the inverting input terminal of the operational amplifier U1 is coupled to the output terminal of the operational amplifier U1 via a capacitor C6, and the resistor R2 and the capacitor C6 form a self-oscillation suppression circuit.

[0007] Furthermore, the inverting proportional circuit includes: an amplifier circuit formed by transistor Q5 and transistor Q6, a push-pull follower circuit formed by transistor Q9 and transistor Q10, a current limiting protection circuit formed by transistor Q7 and transistor Q8, and the amplifier circuit is connected to the push-pull follower circuit formed by transistor Q9 and transistor Q10.

[0008] Furthermore, the amplifier circuit includes: resistors R4, R5, R6 and R7 connected between the positive and negative voltages of the high-voltage vehicle power supply V2, wherein the output end of the operational amplifier U1 of the series composite amplifier circuit is connected between the resistors R6 and R7, the base of the transistor Q5 is connected between the resistors R4 and R5, the emitter of the transistor Q5 is connected to the positive voltage of the high-voltage vehicle power supply V2 via the resistor R9, the collector of the transistor Q5 is connected to the P pole of the diode D2, the N pole of the diode D2 is fed back to the base of the transistor Q5 via R8, the N pole of the diode D2 is connected to the P pole of the diode D3, the N pole of the diode D3 is connected to the collector of the transistor Q6, the emitter of the transistor Q6 is connected to the negative voltage of the high-voltage vehicle power supply V2 via the resistor R11, the base of the transistor Q6 is connected between the resistors R6 and R7, and the P pole of the diode D3 is fed back to the base of the transistor Q6 via the resistor R10.

[0009] Furthermore, the push-pull follower circuit includes: a transistor Q9 and a transistor 10, the base of the transistor Q9 is connected to the collector of the transistor Q5, the collector of the transistor Q9 is connected to the positive voltage of the high-voltage vehicle power supply V2, the emitter of the transistor Q9 is coupled to the emitter of the transistor Q10, the collector of the transistor Q10 is connected to the negative voltage of the high-voltage vehicle power supply V2, and the base of the transistor Q10 is connected to the collector of the transistor Q6.

[0010] Furthermore, the current limiting protection circuit includes: a detection resistor R14 and a detection resistor R15 coupled between the emitter of transistor Q9 and the emitter of transistor Q10, the detection resistor R14 is coupled to the base of transistor Q7 via resistor R12, the collector of transistor Q7 is connected to the base of transistor Q9, the emitter of transistor Q7 is connected to the emitter of transistor Q8, the emitter of transistor Q7 is connected between the detection resistor R14 and the detection resistor R15, the base of transistor Q8 is coupled to the detection resistor 15 via resistor R13, and the collector of transistor Q8 is connected to the base of transistor Q10.

[0011] Furthermore, the capacitor C1 and the capacitor C2 are connected to the explosion-proof switch S1 and the explosion-proof switch S2 respectively, and the explosion-proof switch S1 and the explosion-proof switch S2 are electrically connected to the vehicle controller via the switch driving circuit respectively.

[0012] The above technical solution provided by the embodiment of the utility model has the following advantages compared with the prior art:

[0013] The present application includes a series composite amplifier circuit connecting a low-voltage vehicle power supply V1 and a high-voltage vehicle power supply V2, a capacitor C1 and a capacitor C2 are connected in parallel between the DC output of the series composite amplifier circuit and the ground, the DC output of the series composite amplifier circuit is electrically connected to a full-bridge inverter circuit, the output of the full-bridge inverter circuit is connected to a transmitter LC resonant circuit, the transmitter LC resonant circuit is coupled to a receiver LC resonant circuit, the receiver LC resonant circuit is connected to a rectifier bridge D1, the output of the rectifier bridge D1 is connected to a capacitor C5, and the capacitor C5 is connected to the power input end of the electronic accessories for a lithium battery electric shovel truck for mining. The full-bridge inverter circuit, the transmitter LC resonant circuit, the capacitor C1 and the capacitor C2 form a transmitter, and the receiver LC resonant circuit, the rectifier bridge D1 and the capacitor C5 form a receiver. The present application wirelessly powers the electronic accessories of a lithium battery electric shovel truck for mining through the series composite amplifier circuit, the transmitter and the receiver. During operation and maintenance, the electronic accessories can be replaced with power, without worrying about discharge sparks, ensuring efficiency and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 A schematic diagram of a power supply circuit for electronic accessories of a mining lithium battery electric shovel loader provided by an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of a series composite amplifier circuit provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the application of the electronic accessories power supply circuit for a lithium battery electric shovel loader for mining provided in an embodiment of the utility model in a lithium battery electric shovel loader for mining. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0021] See also Figure 1 As shown, the embodiment of the utility model provides a power supply circuit for electronic accessories of a mining lithium battery electric shovel loader, comprising:

[0022] A series composite amplifier circuit is connected to the low-voltage vehicle power supply V1 and the high-voltage vehicle power supply V2, and the series composite amplifier circuit is used to provide a set DC voltage to the transmitter. The low-voltage vehicle power supply V1 is a 24V DC power supply to power the control circuit of the mining lithium battery electric shovel truck, and the high-voltage vehicle power supply V2 is the power battery of the mining lithium battery electric shovel truck.

[0023] In the specific implementation process, Figure 2As shown, the series composite amplifier circuit includes: an operational amplifier U1, the non-inverting input terminal of the operational amplifier U1 is connected to the low-voltage vehicle power supply V1 through a resistor R1, and the inverting input terminal of the operational amplifier U1 is grounded. In the specific implementation process, the inverting input terminal of the operational amplifier U1 is grounded through a resistor R2. The inverting input terminal of the operational amplifier U1 is coupled to the output terminal of the operational amplifier U1 through a capacitor C6, and the resistor R2 and the capacitor C6 form a self-excited oscillation suppression circuit. Ensure that the power supply of the series composite amplifier circuit is stable. The output terminal of the operational amplifier U1 is connected to an inverting proportional circuit, and the output of the inverting proportional circuit is fed back to the non-inverting input terminal of the operational amplifier U1 through a resistor R3. The resistor R3 is connected in parallel with a capacitor C7, and the inverting proportional circuit is powered by a high-voltage vehicle power supply V2. From the point of view of arrangement, the series composite amplifier circuit connects the inverting proportional circuit in series with the output terminal of the operational amplifier U1, and the inverting proportional circuit inverts and amplifies the voltage output from the output terminal of the operational amplifier U1 and then feeds it back to the non-inverting input terminal of the operational amplifier U1, forming negative feedback, and adjusting the ratio of the resistor R3 and the resistor R1 to control the VOUT voltage. It can provide adaptive power supply voltage for electronic accessories with different needs.

[0024] During the specific implementation process, the inverting proportional circuit includes: an amplifier circuit formed by a transistor Q5 and a transistor Q6, and the amplifier circuit includes: resistors R4, R5, R6 and R7 connected between the positive and negative voltages of the high-voltage vehicle power supply V2, wherein the output end of the operational amplifier U1 of the series composite amplifier circuit is connected between the resistors R6 and R7, the base of the transistor Q5 is connected between the resistors R4 and R5, the emitter of the transistor Q5 is connected to the positive voltage of the high-voltage vehicle power supply V2 via the resistor R9, the collector of the transistor Q5 is connected to the P pole of the diode D2, and the resistors R4, R5 and R9 form a static bias circuit of the transistor Q5. The N-pole of diode D2 is fed back to the base of transistor Q5 via R8, the N-pole of diode D2 is connected to the P-pole of diode D3, the N-pole of diode D3 is connected to the collector of transistor Q6, the emitter of transistor Q6 is connected to the negative voltage of high-voltage vehicle power supply V2 via resistor R11, the base of transistor Q6 is connected between resistor R6 and resistor R7, resistor R11, resistor R7 and resistor R6 form a static bias circuit of transistor Q6, and the P-pole of diode D3 is fed back to the base of transistor Q6 via resistor R10.

[0025] The amplifier circuit is electrically connected to a push-pull follower circuit formed by transistor Q9 and transistor Q10, and the push-pull follower circuit includes: transistor Q9 and transistor 10, the base of transistor Q9 is connected to the collector of transistor Q5, the collector of transistor Q9 is connected to the positive voltage of the high-voltage vehicle power supply V2, the emitter of transistor Q9 is coupled to the emitter of transistor Q10, the collector of transistor Q10 is connected to the negative voltage of the high-voltage vehicle power supply V2, and the base of transistor Q10 is connected to the collector of transistor Q6.

[0026] The push-pull follower circuit is electrically connected to a current limiting protection circuit formed by transistor Q7 and transistor Q8, and the current limiting protection circuit includes: a detection resistor R14 and a detection resistor R15 coupled between the emitter of transistor Q9 and the emitter of transistor Q10, the detection resistor R14 is coupled to the base of transistor Q7 via resistor R12, the collector of transistor Q7 is connected to the base of transistor Q9, the emitter of transistor Q7 is connected to the emitter of transistor Q8, the emitter of transistor Q7 is connected between the detection resistor R14 and the detection resistor R15, the base of transistor Q8 is coupled to the detection resistor 15 via resistor R13, and the collector of transistor Q8 is connected to the base of transistor Q10.

[0027] A capacitor C1 and a capacitor C2 are connected in parallel between the DC output of the series composite amplifier circuit and the ground, and the capacitor C1 and the capacitor C2 are connected to explosion-proof switches S1 and S2 respectively, and the explosion-proof switches S1 and S2 are electrically connected to the vehicle controller via a switch driving circuit respectively. The access of the capacitor C1 and the capacitor C2 is controlled to adapt to different voltages.

[0028] The DC output of the series composite amplifier circuit is electrically connected to the full-bridge inverter circuit, the output of the full-bridge inverter circuit is connected to the transmitter LC resonant circuit, the transmitter LC resonant circuit is coupled to the receiver LC resonant circuit, the receiver LC resonant circuit is connected to the rectifier bridge D1, the output of the rectifier bridge D1 is connected to the capacitor C5, and the capacitor C5 is connected to the power input end of the electronic accessories for the lithium battery electric shovel truck for mining. The full-bridge inverter circuit, the transmitter LC resonant circuit, the capacitor C1 and the capacitor C2 form the transmitter, and the receiver LC resonant circuit, the rectifier bridge D1 and the capacitor C5 form the receiver. The present application wirelessly powers the electronic accessories of the lithium battery electric shovel truck for mining by combining the series composite amplifier circuit, the transmitter and the receiver. During operation and maintenance, the electronic accessories can be replaced with power without worrying about discharge sparks.

[0029] See also Figure 3 As shown, the electronic accessories power supply circuit provided by the embodiment of the utility model for the electric shovel loader with a lithium battery for mining can be independently applied to electronic accessories that need to be independently controlled, such as reversing images, speakers and water pump motors; the electronic accessories power supply circuit for the electric shovel loader with a lithium battery for mining can be applied to multiple electronic accessories that work synchronously, such as front lights and rear lights; the electronic accessories power supply circuit for the electric shovel loader with a lithium battery for mining can be applied to multiple electronic accessories that work all the time, such as methane gas sensors and air pressure sensors.

[0030] In the embodiments provided by the present utility model, it should be understood that the disclosed structure can be implemented in other ways. For example, the structural embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, structures or units, which can be electrical, mechanical or other forms.

[0031] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0032] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0033] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious 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 invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A power supply circuit for electronic accessories of a mining lithium battery electric shovel loader, characterized in that: include: A series composite amplifier circuit is connected to a low-voltage on-board power supply V1 and a high-voltage on-board power supply V2, capacitors C1 and C2 are connected in parallel between the DC output of the series composite amplifier circuit and the ground, the DC output of the series composite amplifier circuit is electrically connected to a full-bridge inverter circuit, the output of the full-bridge inverter circuit is connected to a transmitting end LC resonant circuit, the transmitting end LC resonant circuit is coupled to a receiving end LC resonant circuit, the receiving end LC resonant circuit is connected to a rectifier bridge D1, the output of the rectifier bridge D1 is connected to capacitor C5, and capacitor C5 is connected to the power input end of the electronic accessories for the lithium battery electric shovel truck for mining.

2. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 1 is characterized in that: The series composite amplifier circuit includes: an operational amplifier U1, the non-inverting input terminal of the operational amplifier U1 is connected to the low-voltage vehicle power supply V1 via a resistor R1, the inverting input terminal of the operational amplifier U1 is grounded, the output terminal of the operational amplifier U1 is connected to an inverting proportional circuit, the output of the inverting proportional circuit is fed back to the non-inverting input terminal of the operational amplifier U1 via a resistor R3, the resistor R3 is connected in parallel with a capacitor C7, and the inverting proportional circuit is powered by a high-voltage vehicle power supply V2.

3. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 2 is characterized in that: The inverting input terminal of the operational amplifier U1 is grounded via a resistor R2. The inverting input terminal of the operational amplifier U1 is coupled to the output terminal of the operational amplifier U1 via a capacitor C6. The resistor R2 and the capacitor C6 form a self-oscillation suppression circuit.

4. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 2 is characterized in that: The inverting proportional circuit includes: an amplifier circuit formed by transistor Q5 and transistor Q6, a push-pull follower circuit formed by transistor Q9 and transistor Q10, and a current limiting protection circuit formed by transistor Q7 and transistor Q8. The amplifier circuit is connected to the push-pull follower circuit formed by transistor Q9 and transistor Q10.

5. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 4 is characterized in that: The amplifier circuit includes: a resistor R4, a resistor R5, a resistor R6 and a resistor R7 connected between the positive and negative voltages of the high-voltage vehicle power supply V2, wherein the output end of the operational amplifier U1 of the series composite amplifier circuit is connected between the resistor R6 and the resistor R7, the base of the transistor Q5 is connected between the resistor R4 and the resistor R5, the emitter of the transistor Q5 is connected to the positive voltage of the high-voltage vehicle power supply V2 via the resistor R9, the collector of the transistor Q5 is connected to the P pole of the diode D2, the N pole of the diode D2 is fed back to the base of the transistor Q5 via R8, the N pole of the diode D2 is connected to the P pole of the diode D3, the N pole of the diode D3 is connected to the collector of the transistor Q6, the emitter of the transistor Q6 is connected to the negative voltage of the high-voltage vehicle power supply V2 via the resistor R11, the base of the transistor Q6 is connected between the resistor R6 and the resistor R7, and the P pole of the diode D3 is fed back to the base of the transistor Q6 via the resistor R10.

6. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 5 is characterized in that: The push-pull follower circuit includes: a transistor Q9 and a transistor 10, the base of the transistor Q9 is connected to the collector of the transistor Q5, the collector of the transistor Q9 is connected to the positive voltage of the high-voltage vehicle power supply V2, the emitter of the transistor Q9 is coupled to the emitter of the transistor Q10, the collector of the transistor Q10 is connected to the negative voltage of the high-voltage vehicle power supply V2, and the base of the transistor Q10 is connected to the collector of the transistor Q6.

7. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 6 is characterized in that: The current limiting protection circuit includes: a detection resistor R14 and a detection resistor R15 coupled between the emitter of the transistor Q9 and the emitter of the transistor Q10, the detection resistor R14 is coupled to the base of the transistor Q7 via the resistor R12, the collector of the transistor Q7 is connected to the base of the transistor Q9, the emitter of the transistor Q7 is connected to the emitter of the transistor Q8, the emitter of the transistor Q7 is connected between the detection resistor R14 and the detection resistor R15, the base of the transistor Q8 is coupled to the detection resistor R15 via the resistor R13, and the collector of the transistor Q8 is connected to the base of the transistor Q10.

8. The power supply circuit for electronic accessories of a mining lithium battery electric shovel loader according to claim 1 is characterized in that: The capacitor C1 and the capacitor C2 are connected to the explosion-proof switch S1 and the explosion-proof switch S2 respectively, and the explosion-proof switch S1 and the explosion-proof switch S2 are electrically connected to the vehicle controller via the switch driving circuit respectively.

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