Power supply module and power supply system of coke oven vehicle

Abstract

The utility model provides a power supply module and a power supply system of a coke oven vehicle, comprising a power supply control unit, a rectification unit, a first current-limiting protection unit and a second current-limiting protection unit, the power supply control unit is used for providing a first AC power supply, and the rectification unit is connected with the power supply control unit. The rectifying unit is used for rectifying the first alternating current power supply to obtain a direct current power supply for supplying power to a load; the rectification unit is connected in parallel with the input end of the rectification unit, and the rectification unit is used for carrying out current limiting protection on the input end of the rectification unit; and the second current-limiting protection unit is connected in parallel with the output end of the rectification unit, and the second current-limiting protection unit is used for carrying out current-limiting protection on the output end of the rectification unit. By arranging the first current-limiting protection unit and the second current-limiting protection unit, current-limiting protection can be carried out on the rectification unit, so that components in the rectification unit are prevented from being burnt due to overlarge current, and the service life of the power supply module is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply, and in particular relates to a power supply module and a power supply system of a coke oven vehicle. Background Art

[0002] When supplying power to a load, it is often necessary to convert AC power into DC power. Rectification can convert AC power into DC power. Rectification is a circuit that uses the unidirectional conductivity of a diode to convert positive and negative AC voltage into a unidirectional pulsating voltage. Under the action of an AC power source, the rectifier diode periodically turns on and off, allowing the load to receive pulsating DC power.

[0003] However, in the process of converting AC to DC, the rectifier unit in the conversion circuit is often burned due to excessive current because other protection devices are not configured in the conversion circuit. This will seriously affect the normal use of the load and even affect people's work and life. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a power supply module and a power supply system for a coke oven vehicle, which are used to solve the problems in the prior art that the rectifier circuit is easily burned out due to the lack of a protection device in the circuit.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a power supply module, including:

[0006] A power control unit, used for providing a first AC power supply;

[0007] a rectifier unit, connected to the power control unit, and configured to rectify the first AC power supply to obtain a DC power supply for supplying power to a load;

[0008] a first current limiting protection unit, connected in parallel with the input end of the rectifier unit, and configured to perform current limiting protection on the input end of the rectifier unit;

[0009] The second current limiting protection unit is connected in parallel with the output end of the rectifying unit and is used for performing current limiting protection on the output end of the rectifying unit.

[0010] Optionally, the power supply module further includes a discharge protection unit, which is used to discharge the reverse electromotive force generated by the load corresponding to the positive and negative terminals of the DC power supply.

[0011] Optionally, the discharge protection unit also includes a first diode and a third resistor connected in series, the first end of the third resistor is connected to the positive end of the DC power supply, the second end of the third resistor is connected to the cathode of the first diode, and the anode of the first diode is connected to the negative end of the DC power supply.

[0012] Optionally, the power control unit further includes a main coil connected to an external power source and a secondary coil connected to the rectifier unit, a circuit breaker is provided at the input end of the main coil, and a contactor switch is provided at the output end of the secondary coil.

[0013] Optionally, the power supply module also includes a control box, and the power control unit, the rectifier unit, the first current limiting protection unit and the second current limiting protection unit are all arranged in the control box. The control box is also provided with a display screen, and the display screen is connected to the main coil power supply. The display screen is used to display the voltage of the first AC power supply and the voltage of the DC power supply.

[0014] Optionally, the first current limiting protection unit includes a first resistor and a first capacitor connected in series, the first end of the first resistor is connected to the input end of the rectifier unit, the second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the input end of the rectifier unit.

[0015] Optionally, the second current limiting protection unit includes a second resistor and a second capacitor connected in series, the first end of the second resistor is connected to the positive end of the DC power supply, the second end of the second resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the negative end of the DC power supply.

[0016] Optionally, the rectifier unit includes a packaged rectifier bridge.

[0017] Optionally, the power supply module also includes a sliding rheostat, the positive end of the DC power supply is connected to the first end of the load, the second end of the load is connected to the sliding end of the sliding rheostat, and the fixed end of the sliding rheostat is connected to the negative end of the DC power supply, and the sliding rheostat is used to divide the voltage and limit the current of the load.

[0018] The utility model provides a power supply module, comprising the power supply module as described above.

[0019] As described above, the power supply module of the coke oven vehicle and the power supply system of the coke oven vehicle of the utility model have the following beneficial effects:

[0020] By setting a first current limiting protection unit, the input end of the rectifier unit can be protected by current limiting, so as to prevent the current entering the input end of the rectifier unit from being too large, thereby burning the components in the rectifier unit, and thus being unable to continue to supply power to the load, causing the load to stop working and affecting the normal use of the load. By setting a second current limiting protection unit, the output end of the rectifier unit can be protected by current limiting. In this way, the stability of the rectifier unit during use can be ensured, and the service life of the rectifier unit can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit diagram of a power supply module according to an embodiment of the utility model.

[0022] Figure 2 It is a schematic diagram of the structure of the control box of the utility model embodiment.

[0023] Explanation of reference numerals: 1. power control unit; 2. first current limiting protection unit; 3. rectifier unit; 4. second current limiting protection unit; 5. discharge protection unit; 6. display screen; QF circuit breaker; KM contactor switch; R1 first resistor; C1 first capacitor; R2 second resistor; C2 second capacitor; R3 third resistor; V1 first diode; R4 sliding rheostat; M load; T transformer. DETAILED DESCRIPTION

[0024] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] See also Figure 1 and Figure 2 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0026] In order to describe the present invention in detail, a power supply module and a power supply system of a coke oven vehicle of the present invention are specifically described below:

[0027] See also Figure 1The utility model provides a power supply module, including a power control unit 1, a rectifier unit 3, a first current limiting protection unit 2 and a second current limiting protection unit 4. The power control unit 1 is used to provide a first AC power supply. The rectifier unit 3 is connected to the power control unit. The rectifier unit 3 is used to rectify the first AC power supply to obtain a DC power supply for powering a load M. The rectifier unit 3 is connected in parallel with the input end of the rectifier unit 3, and the rectifier unit 3 is used to perform current limiting protection on the input end of the rectifier unit 3. The second current limiting protection unit 4 is connected in parallel with the output end of the rectifier unit 3, and the second current limiting protection unit 4 is used to perform current limiting protection on the output end of the rectifier unit 3. By setting the first current limiting protection unit 2, the input end of the rectifier unit 3 can be current-limited to prevent the current entering the input end of the rectifier unit 3 from being too large, thereby burning the components in the rectifier unit 3, and thus being unable to continue to power the load M, causing the load M to stop working and affecting the normal use of the load M. By setting the second current limiting protection unit 4, the output end of the rectifier unit 3 can be current-limited. In this way, the stability of the rectifying unit 3 during use can be ensured, and the service life of the rectifying unit 3 can be extended.

[0028] Among them, the power supply module also includes a discharge protection unit 5, which is used to discharge the reverse electromotive force generated by the load M corresponding to the positive and negative ends of the DC power supply. Some loads M may be provided with an induction coil inside. When the load M loop is suddenly cut off, since the current in the induction coil cannot change suddenly, and the voltage of the induction coil is proportional to the rate of change of the current at the induction coil, if the current in the induction coil changes quickly, a higher voltage will be generated at both ends of the induction coil. Therefore, if the return current containing the induction coil is cut off in a short time, an arc is likely to be generated. By setting the discharge protection unit 5, when the induction coil in the load M generates an arc, the discharge protection unit 5 can discharge the reverse electromotive force generated by the load M corresponding to the positive and negative ends of the DC power supply, so as to prevent the large current generated by the arc from instantly breaking through or burning the components in the rectifier unit 3, shortening the service life of the rectifier unit 3, and increasing the maintenance cost.

[0029] Specifically, the discharge protection unit 5 further includes a first diode V1 and a third resistor R3 connected in series, wherein the first end of the third resistor R3 is connected to the positive end of the DC power supply, the second end of the third resistor R3 is connected to the cathode of the first diode V1, and the anode of the first diode V1 is connected to the negative end of the DC power supply. In some embodiments, the cathode of the first diode V1 is connected to the positive end of the DC power supply, the anode of the first diode V1 is connected to the first end of the third resistor R3, the cathode of the first diode V1 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the negative end of the DC power supply. By using the first diode V1 and the third resistor R3 to discharge the reverse electromotive force generated by the load M, the structure is simple, easy to implement, and low cost.

[0030] Among them, the power control unit 1 also includes a main coil connected to an external power supply and a secondary coil connected to a rectifier unit 3. A circuit breaker QF is provided at the input end of the main coil, and a contactor switch KM is provided at the output end of the secondary coil. In this embodiment, the main coil and the secondary coil are used as a transformer T, and the two cooperate to reduce the voltage, and the 220-volt AC is reduced to 110-volt AC. The voltage reduction method has a simple structure, good voltage reduction effect, and is easy to implement. The circuit breaker QF is provided at the input end of the main coil to facilitate timely power off when the power supply module is overhauled, thereby enhancing the control of the entire power supply module. The contactor switch KM is provided at the output end of the secondary coil, which is convenient for controlling the opening and closing of the load M.

[0031] See also Figure 2 , wherein the power supply module further comprises a control box, a power control unit 1, a rectifier unit 3, a first current limiting protection unit 2 and a second current limiting protection unit 4 are all arranged in the control box, and a display screen 6 is also arranged on the control box, the display screen 6 is connected to the main coil power supply, and the display screen 6 is used to display the voltage of the first AC power supply and the voltage of the DC power supply. In this embodiment, the control box is made of aluminum, the control box is fixed to the wall by bolts, and two heat dissipation holes are opened on the upper and lower parts of the control box. A display screen is arranged on the front of the control box, and the voltage of the first AC power supply, the voltage and current information of the DC power supply are displayed on the display screen, and the power supply module is conveniently repaired through this information. When the power supply module fails, the maintenance personnel can quickly find out the cause of the failure through the values ​​displayed on the display screen. A semi-sealed wiring terminal is arranged below the display screen, and the wiring hole can be blocked after the wiring is completed to reduce the failure rate of the equipment.

[0032] Specifically, the first current limiting protection unit 2 includes a first resistor R1 and a first capacitor C1 connected in series, the first end of the first resistor R1 is connected to the input end of the rectifier unit 3, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to the input end of the rectifier unit 3. In some embodiments, the first end of the first capacitor C1 is connected to the input end of the rectifier unit 3, the second end of the first capacitor C1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the input end of the rectifier unit 3. The capacitor has the characteristic of "passing AC and blocking DC", the AC power of the first AC power source can pass through the first capacitor C1, and the first current limiting protection unit 2 shunts part of the current to reduce the current entering the rectifier unit 3, so that the first current limiting protection unit 2 can perform current limiting protection on the input end of the rectifier unit 3.

[0033] Specifically, the second current limiting protection unit 4 includes a second resistor R2 and a second capacitor C2 connected in series, the first end of the second resistor R2 is connected to the positive end of the DC power supply, the second end of the second resistor R2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the negative end of the DC power supply. In some embodiments, the first end of the second capacitor C2 is connected to the positive end of the DC power supply, the second end of the second capacitor C2 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the negative end of the DC power supply. Since the DC power supply output by the rectifier circuit is a unidirectional pulsating voltage composed of a unidirectional half-wave, the voltage has an intensity change and also includes residual AC and harmonic components, the DC power supply output by the rectifier unit 3 is difficult to make the load M work normally. After adding the second capacitor C2 and the second resistor R2, the second capacitor C2 pulls the corresponding unidirectional wave pulsating voltage in the DC power supply to a voltage value that is approximately smooth, and the second capacitor C2 can also filter out the residual AC and harmonic components in the second current to avoid the residual AC part in the DC power supply affecting the normal operation of the load M.

[0034] In detail, the rectifier unit 3 includes a packaged rectifier bridge. In this embodiment, the model of the packaged rectifier bridge is MDS100A1600V. Compared with four exposed diodes, the packaged rectifier bridge can be better isolated from the outside and has better stability during operation.

[0035] The power supply module further includes a sliding rheostat R4, the positive end of the DC power supply is connected to the first end of the load M, the second end of the load M is connected to the sliding end of the sliding rheostat R4, the fixed end of the sliding rheostat R4 is connected to the negative end of the DC power supply, and the sliding rheostat R4 is used to divide the voltage and limit the current of the load M. In this embodiment, the sliding rheostat R4 is connected in series with the discharge protection unit 5 and then connected in parallel with the second current limiting protection unit 4, and the load M is connected in parallel with the discharge protection unit 5. By adjusting the position of the active end of the sliding rheostat R4, the voltage at the load M can be adjusted, and the current passing through the load M can also be limited.

[0036] This embodiment also proposes a power supply system for a coke oven vehicle, including the power supply module as described above. In this embodiment, the power supply module is used in a coke oven vehicle for coke oven production. During coke oven production, bituminous coal is dry-distilled to form coke, and the four major coke oven vehicles (coke pusher, coke interceptor, coke oven coal loading vehicle and dry quenching vehicle) cooperate with each other to complete the coke production operation around the coke oven coking process. Therefore, ensuring the safe operation of the four major coke oven vehicles is the top priority in the coke production process. The power supply mode of the coke oven vehicle is mostly a three-phase three-wire 380V low-voltage power supply. The control circuit is powered by a 380 / 220 suspension transformer. Among them, the hydraulic system, eddy current braking system, and excitation system are powered by 110V DC. The above-mentioned DC power uses a transformer T to reduce the 220V voltage to 110V, and then converts the AC into a DC output through a unidirectional bridge rectifier circuit. However, the original circuit is directly output to the load M through a bridge rectifier circuit, and no other protection devices are configured. Since the load M has an induction coil, when the circuit where the load M is located is cut off, a spike voltage may occur in the circuit, thereby burning out the rectifier circuit in the circuit. If the current entering the bridge rectifier circuit in the circuit is too large, the rectifier circuit will also be burned out. Therefore, a power supply module is proposed to solve this problem.

[0037] In this embodiment, the first capacitor C1 is 4uf, the second capacitor C2 is 2uf, the first resistor R1 and the second resistor R2 are both 20Ω, the power is 50W, and the third resistor R3 is 40Ω, the power is 200W.

[0038] In summary, by setting the first current limiting protection unit 2, the input end of the rectifier unit 3 can be protected by current limiting, so as to prevent the current entering the input end of the rectifier unit 3 from being too large, thereby burning the components in the rectifier unit 3, and thus being unable to continue to supply power to the load M, causing the load M to stop working, and affecting the normal use of the load M. By setting the second current limiting protection unit 4, the output end of the rectifier unit 3 can be protected by current limiting. In this way, the stability of the rectifier unit 3 during use can be ensured, and the service life of the rectifier unit 3 can be extended.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A power supply module, characterized in that: include: A power control unit, the power control unit is used to provide a first AC power supply; a rectifier unit, the rectifier unit being connected to the power control unit, and the rectifier unit being used to rectify the first AC power supply to obtain a DC power supply for supplying power to a load; A first current limiting protection unit, the first current limiting protection unit is connected in parallel with the input end of the rectifying unit, and the first current limiting protection unit is used to perform current limiting protection on the input end of the rectifying unit; A second current limiting protection unit is connected in parallel with the output end of the rectifying unit and is used for performing current limiting protection on the output end of the rectifying unit.

2. The power supply module according to claim 1, characterized in that: The power supply module further includes a discharge protection unit, which is used to discharge the reverse electromotive force generated by the load corresponding to the positive and negative terminals of the DC power supply.

3. The power supply module according to claim 2, characterized in that: The discharge protection unit also includes a first diode and a third resistor connected in series, wherein a first end of the third resistor is connected to a positive end of the DC power supply, a second end of the third resistor is connected to a cathode of the first diode, and an anode of the first diode is connected to a negative end of the DC power supply.

4. The power supply module according to claim 1, characterized in that: The power control unit further comprises a main coil connected to an external power source and a secondary coil connected to the rectifier unit, a circuit breaker is arranged at the input end of the main coil, and a contactor switch is arranged at the output end of the secondary coil.

5. The power supply module according to claim 4, characterized in that: The power supply module also includes a control box, and the power control unit, the rectifier unit, the first current limiting protection unit and the second current limiting protection unit are all arranged in the control box. The control box is also provided with a display screen, which is connected to the main coil power supply, and the display screen is used to display the voltage of the first AC power supply and the voltage of the DC power supply.

6. The power supply module according to claim 1, characterized in that: The first current limiting protection unit includes a first resistor and a first capacitor connected in series, the first end of the first resistor is connected to the input end of the rectifier unit, the second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the input end of the rectifier unit.

7. The power supply module according to claim 1, characterized in that: The second current limiting protection unit includes a second resistor and a second capacitor connected in series, the first end of the second resistor is connected to the positive end of the DC power supply, the second end of the second resistor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the negative end of the DC power supply.

8. The power supply module according to claim 1, characterized in that: The rectifier unit includes a packaged rectifier bridge.

9. The power supply module according to claim 1, characterized in that: The power supply module also includes a sliding rheostat, the positive end of the DC power supply is connected to the first end of the load, the second end of the load is connected to the sliding end of the sliding rheostat, and the fixed end of the sliding rheostat is connected to the negative end of the DC power supply. The sliding rheostat is used to divide the voltage and limit the current of the load.

10. A power supply system for a coke oven vehicle, characterized in that: Comprising a power supply module as described in any one of claims 1 to 9.

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