A power supply device for roller press control cabinet

Abstract

The utility model relates to the technical field of power supply, and discloses a power supply device for a roller press control cabinet, including a power supply circuit, one end of the power supply circuit is 220V, the other end of the power supply circuit is 0 and +24V respectively, the power supply circuit is provided with electromagnetic filtering, rectification filtering, switching circuit, PWM control, feedback control circuit and overvoltage protection circuit, the electromagnetic filtering, rectification filtering, switching circuit are arranged in series near the 220V end, two groups of inductance coils are arranged between the switching circuit and the PWM control, and overload protection is provided between the switching circuit and the PWM control and between one group of inductance coils and the PWM control. The utility model ensures the equipment operation rate, avoids the damage of the roller press proportional valve caused by power supply damage, saves 300,000 yuan of funds due to the damage of the proportional valve and the burning of the PLC each year, and reduces safety hazards.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply device for a roller press control cabinet. Background Art

[0002] Roller press is a kind of equipment used for energy-saving cement grinding. It is designed according to the principle of material bed grinding and consists of two extrusion rollers that rotate synchronously in opposite directions, one is a fixed roller and the other is a movable roller. The 24V power supply of the power supply device of the control cabinet of the roller press is a coupling transformer. The 220V primary coil is converted into 24V AC through the magnetic field of the iron core, and then becomes a DC 24V power supply after filtering and voltage stabilization through a bridge rectifier capacitor. When the roller press is operating normally, the core control power supply in the control cabinet is a low-voltage 24V power supply to ensure the stability of the entire system of the roller press.

[0003] However, the current power supply device of the roller press control cabinet still has some shortcomings during use, such as: the operation of PLC, the power supply of the intermediate relay, the power supply of the touch screen, including the power supply of the on-site temperature and pressure sensors, all circuit controls of the hydraulic oil station, and the power supply of the on-site solenoid valve are all provided by the 24 power supply of the control cabinet, which plays the main role of the entire roller press control cabinet. When the voltage is unstable and too high or too low, or when the on-site 24v power supply load is large, the overload capacity of the coil transformer is not strong, and it is easy to burn out the transformer coil, 220v power supply and easy breakdown of the voltage-stabilized power supply, causing breakdown or damage to the on-site electronic components, such as the proportional valve reversing valve of the hydraulic oil station, etc.

[0004] Therefore, we propose a power supply device for a roller press control cabinet to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the utility model is to provide a power supply device for a roller press control cabinet to solve the problem raised in the above background technology that when the voltage is unstable and too high or too low or the on-site 24V power supply load is large, the overload capacity of the coil transformer is not strong, it is easy to burn out the transformer coil, the 220V power supply and the voltage-stabilized power supply are easy to break down, causing breakdown or damage to the on-site electronic components.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power supply device for a roller press control cabinet, comprising a power supply circuit, one end of the power supply circuit is 220V, the other end of the power supply circuit is 0 and +24V respectively, and the power supply circuit is provided with electromagnetic filtering, rectification filtering, switching circuit, PWM control, feedback control circuit and overvoltage protection circuit.

[0007] Preferably, the electromagnetic filter, rectifier filter and switching circuit are connected in series close to the 220V end.

[0008] Preferably, two groups of inductance coils are provided between the switching loop and the PWM control, and overload protection is provided between the switching loop and the PWM control and between one group of the inductance coils and the PWM control.

[0009] Preferably, the rectifier filter is arranged on both sides of the switching circuit, and an inductor coil is arranged between the rectifier filter near the 0 and +24V ends and the switching circuit.

[0010] Preferably, one end of the feedback control loop and the overvoltage protection loop are both electrically connected to the PWM control, and the other end of the feedback control loop and the overvoltage protection loop are both electrically connected to the wire of the +24V end.

[0011] Preferably, the wires at the 0V and +24V ends are connected to capacitors and then grounded, and the electromagnetic filter is connected to capacitors and then grounded.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model relates to a power supply device for a roller press control cabinet, which ensures the equipment operation rate and avoids damage to the roller press proportional valve caused by power supply damage.

[0014] 2. The utility model relates to a power supply device for a roller press control cabinet, which saves 300,000 yuan of funds each year due to the failure of proportional valves and the burning of PLCs.

[0015] 3. The power supply device of the roller press control cabinet involved in the utility model reduces potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the circuit structure of a 24V power supply device of a roller press control cabinet before and after the transformation. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0018] Example 1: Please refer to Figure 1A power supply device for a roller press control cabinet includes a power supply circuit, one end of the power supply circuit is 220V, and the other end of the power supply circuit is 0 and +24V respectively. The power supply circuit is provided with electromagnetic filtering, rectification filtering, switching circuit, PWM control, feedback control circuit and overvoltage protection circuit. It should be noted that PWM control: modulates the width of the pulse, that is, by modulating the width of a series of pulses, to equivalently obtain the required waveform (including shape and amplitude). Feedback, also known as feedback, is a basic concept of control theory. Direct feedback refers to the process of directly returning the output of the system to the input end and changing the input in some way. There is a causal loop between them, which in turn affects the function of the system.

[0019] The electromagnetic filter, the rectifier filter and the switching circuit are connected in series close to the 220V end.

[0020] Two groups of inductors are provided between the switching circuit and the PWM control. Overload protection is provided between the switching circuit and the PWM control and between one group of inductors and the PWM control. The amount of current that is allowed to pass continuously in the electrical circuit without causing the wire to overheat is called the safe current carrying capacity or the safe current. If the current flowing through the wire exceeds the safe current carrying capacity, it is called wire overload. Setting overload protection can prevent the main power line from overloading and causing the protector to be damaged by overheating.

[0021] The rectifier filter is arranged on both sides of the switching circuit, and an inductor coil is arranged between the rectifier filter near the 0 and +24V ends and the switching circuit.

[0022] One end of the feedback control loop and the overvoltage protection loop are both electrically connected to the PWM control, and the other end of the feedback control loop and the overvoltage protection loop are both electrically connected to the wire of the +24V end.

[0023] The wires at the 0 and +24V ends are connected to capacitors and then grounded, and the electromagnetic filter is connected to capacitors and then grounded, providing a path for high-frequency signals, reducing the internal resistance of the power supply, removing the impact of long power and ground wires on the copper-clad board, and preventing harmful connections between the various circuits of the public power supply.

[0024] In this embodiment: electromagnetic filtering: suppresses electromagnetic interference, especially noise in the power supply line or control signal line; rectifier circuit: after the transformer is transformed, it is still AC power, which needs to be converted into DC power before it can be provided to the subsequent circuit. This conversion circuit is the rectifier circuit. In the DC stabilized power supply, the unidirectional conductive characteristics of the diode are used to rectify the AC power with changing direction into DC power; filter circuit: after the AC power is rectified, the pulsating DC power is obtained. Such a DC power supply cannot be directly used as a power supply for electronic circuits because of the large AC ripple contained. The filter circuit can greatly reduce this AC ripple component, making the voltage waveform after rectification smoother.

[0025] Working principle: According to the characteristics of linear transformer power supply and switching power supply, there are mainly the following advantages and disadvantages: Linear transformer power supply is to first reduce the voltage amplitude of AC power through a transformer, and then obtain pulse DC power after rectification through a rectifier circuit, and then obtain DC voltage with a small ripple voltage through filtering. To achieve high-precision DC voltage, it must be stabilized by a voltage stabilizing circuit; Switching power supply uses modern power electronics technology to control the time ratio of the switch on and off to maintain a stable output voltage. The switching power supply is composed of a pulse width modulation (PWM) control IC and MOSFET. The main features are small size and light weight. Since there is no industrial frequency transformer, the size and weight are only 20% to 30% of the linear power supply. It has low power consumption and high efficiency. Ideally, there is no power loss. It can step down or boost the output. The input and output are easy to isolate, and it is easy to achieve multi-channel output. It can output negative voltage and has a wide input voltage range.

[0026] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply device for a roller press control cabinet, comprising a power supply circuit, characterized in that: One end of the power supply circuit is 220V, and the other end of the power supply circuit is 0 and +24V respectively. The power supply circuit is provided with electromagnetic filtering, rectification filtering, switching circuit, PWM control, feedback control circuit and overvoltage protection circuit.

2. The power supply device of a roller press control cabinet according to claim 1, characterized in that: The electromagnetic filter, the rectifier filter and the switching circuit are arranged in series close to the 220V end.

3. The power supply device of the roller press control cabinet according to claim 1, characterized in that: Two groups of inductance coils are arranged between the switching loop and the PWM control, and overload protection is arranged between the switching loop and the PWM control and between one group of inductance coils and the PWM control.

4. The power supply device of a roller press control cabinet according to claim 1, characterized in that: The rectifier filter is arranged on both sides of the switching circuit, and an inductor coil is arranged between the rectifier filter near the 0 and +24V ends and the switching circuit.

5. The power supply device for a roller press control cabinet according to claim 1, characterized in that: One end of the feedback control loop and the overvoltage protection loop are both electrically connected to the PWM control, and the other end of the feedback control loop and the overvoltage protection loop are both electrically connected to the wire of the +24V end.

6. The power supply device of a roller press control cabinet according to claim 1, characterized in that: The wires of the 0V and +24V terminals are connected to capacitors and then grounded, and the electromagnetic filter is connected to capacitors and then grounded.

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