KR102180457B1 - Apparatus for electric power take-off and methdo for taking power off using the same - Google Patents

Abstract

An embodiment of the present invention provides an apparatus capable of controlling output power provided to each functional unit through phase shift control and increasing power supply efficiency through zero current switching. An electric power take-off device according to an embodiment of the present invention includes a battery provided in a vehicle; A converter unit connected to the battery and converting the supply current supplied from the battery into a pulse current of a square wave pulse waveform; An oscillation unit connected to the converter unit to convert a pulse current into a resonance current; A transformation unit connected to the resonance circuit unit and converting the resonance current into an AC current; And a rectifier connected to the transformer and converting the AC current into an output current, which is a DC current, and supplying the output current to the functional unit coupled to the vehicle.

Description

Electric power take-off device and power take-off method using it {APPARATUS FOR ELECTRIC POWER TAKE-OFF AND METHDO FOR TAKING POWER OFF USING THE SAME}

The present invention relates to an electrical power take-off device and a power take-off method using the same, and more particularly, it is possible to control the output power provided to each functional unit through phase shift control, and power supply efficiency through zero current switching. It relates to a device for augmenting.

In general, an electric power take-off device (EPTO: Electirc Power Take Off) applied to a vehicle is to use a vehicle battery for other purposes other than driving the vehicle. For example, in an agricultural vehicle equipped with a pesticide sprayer and water supply equipment (hereinafter referred to as'functional unit'), the electric power take-off device is used to provide power to the functional unit from the battery of the agricultural vehicle.

However, in the conventional electric power take-off device, when the conventional electrical power take-off device supplies power to the functional units, it is necessary to manually input power suitable for each functional unit to convert the power and provide it. It takes a lot of time to use, and there is a problem of lowering efficiency.

That is, when replacing several functional units, there is a problem that time is delayed when replacing the functional units, and work efficiency is deteriorated because power corresponding to each functional unit has to be input manually.

In Korean Patent Application Laid-Open No. 10-2013-0061965 (name of the invention: low voltage DC power converter for a vehicle), an LDC controller that generates and outputs a PWM switching signal of a preset output voltage command value and a built-in output voltage control module; And a primary MOSFET unit for converting a DC low voltage input from the outside into a DC high voltage using a plurality of power semiconductor switching elements switched by the PWM switching signal input from the LDC controller. have.

Republic of Korea Patent Publication No. 10-2013-0061965

An object of the present invention for solving the above problems is to allow the power supplied from the battery to be suitably controlled for each functional unit.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

The configuration of the present invention for achieving the above object, the battery provided in the vehicle; A converter unit connected to the battery and converting a supply current supplied from the battery into a pulse current of a square wave pulse waveform; An oscillation unit connected to the converter unit to convert the pulse current into a resonance current; A transforming unit connected to the resonance circuit unit and converting the resonance current into an AC current; And a rectifier connected to the transformer and converting the AC current into an output current, which is a DC current, and supplying the output current to a functional unit coupled to the vehicle.

In an embodiment of the present invention, the converter unit may be a full bridge circuit including first to fourth switch elements.

In an embodiment of the present invention, the first to fourth switch devices may be formed of MOSFET transistors.

In an embodiment of the present invention, a control unit connected to the third switch element and the fourth switch element and controlling the phase shift of the third switch element and the fourth switch element to control the output voltage is further provided. Can include.

In an embodiment of the present invention, the transforming unit may be formed of an insulated transformer.

In an embodiment of the present invention, it may further include a power pack for charging the battery while the vehicle is driving.

In an embodiment of the present invention, the power pack may include an engine installed in the vehicle, and a generator that is coupled to the engine and performs power generation by driving the engine.

In an embodiment of the present invention, a battery charging unit may further include a battery charging unit configured to charge a battery by receiving an external AC current, which is an external AC current, and converting it to DC.

The configuration of the present invention for achieving the above object includes: i) coupling the functional unit to the vehicle; ii) identifying the type of the functional unit in the control unit; iii) controlling, by the control unit, a phase shift of the third switch element and the fourth switch element; And iv) generating the output current and providing it to the functional unit.

An effect of the present invention according to the above configuration is that the output power provided to each functional unit can be controlled through the phase shift control, and power supply efficiency is increased through zero current switching.

In addition, the effect of the present invention is that it is possible to perform automatic control so that suitable output power is supplied to the functional unit by using the relatively low voltage power of the battery.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram of an electric power take-off device according to an embodiment of the present invention.
2 is a circuit diagram of an electric power take-off device according to an embodiment of the present invention.
3 is a graph showing the phase of a pulse current according to an embodiment of the present invention.
4 is a graph showing a phase of a pulse current according to another embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in a number of different forms, and therefore is not limited to the exemplary embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, bonded)" with another part, it is not only "directly connected", but also "indirectly connected" with another member in the middle. "Including the case. In addition, when a part "includes" a certain component, it means that other components may be further provided, rather than excluding other components unless specifically stated to the contrary.

The terms used in this specification are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of an electric power take-off device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of an electrical power take-off device according to an embodiment of the present invention.

1 and 2, the electric power take-off device of the present invention includes a battery 200 provided in a vehicle; A converter unit 110 connected to the battery 200 and converting a supply current supplied from the battery 200 into a pulse current of a square wave pulse waveform; An oscillation unit 120 connected to the converter unit 110 to convert a pulse current into a resonance current; A transformer 130 connected to the oscillation unit 120 and converting the resonance current into an AC current; And a rectifier 140 connected to the transformer 130 to convert an AC current into an output current, which is a direct current, and supply an output current to the functional unit 500 coupled to the vehicle.

Here, the functional unit 500 may refer to a pesticide sprayer, a water supply equipment, a robot combined with an agricultural vehicle, etc. as devices due to the electrification of agricultural machinery. In addition, the converter unit 110, the oscillator unit 120, the transformer unit 130, and the rectifier unit 140 may constitute the circuit module 100.

As shown in FIG. 2, the converter unit 110 may be a full bridge circuit including first to fourth switch elements.

The converter unit 110, which is a full bridge circuit, is connected to the battery 200 as a power source, and the first switch element Q1 is connected between one terminal of the battery 200 and a node, and the second switch Element Q2 is connected between a node and the other terminal of the battery 200, the fourth switch element Q4 is connected between one terminal of the battery 200 and the node b, and the third switch element Q3 May be connected between the other terminal of the battery 200 and node b. In addition, according to the switching operation of the first to fourth switch elements Q1, Q2, Q3, and Q4, the supply current, which is the current of the battery 200, which is a DC power source, may be converted into a square wave pulse waveform.

The first oscillation part terminal (c1) of the oscillation part 120 may be connected to the a-node, the second oscillation part terminal (c2) of the oscillation part 120 may be connected to the b-node, and the third oscillation part terminal (c3) of the oscillation part 120 ) And the fourth oscillation part terminal c4 may be connected to the transformer 130.

The oscillation unit 120 may have a resonant circuit, and the pulse current delivered to the oscillator 120 by resonance in the oscillator 120 is converted into a resonant current, and when the idle current passes through the transformer 130, the voltage is boosted. The resonant current is converted into an output current, which is a direct current while passing through the rectifying unit 140, and transmitted to the function unit 500 to drive the function unit 500.

The transformer 130 may be formed of an insulated transformer. Accordingly, compared to the case where a non-insulated transformer is used as the transformer 130, a relatively high step-up ratio can be implemented in the electric power take-off device of the present invention used as an insulating transformer as the transformer 130.

The first to fourth switch devices may be formed of MOSFET transistors. Accordingly, the MOSFET transistor is an oxide layer between the gate and the channel that prevents DC voltage flowing through the gate, thereby further reducing power consumption and increasing the input impedance, thereby increasing the efficiency of the electric power take-off device of the present invention. I can make it.

3 is a graph showing the phase of a pulse current according to an embodiment of the present invention. And, in Figure 3, A graph is a graph of the pulse waveform of the first switch element (Q1), the B graph is a graph of the pulse waveform of the second switch element (Q2), and the C graph is a third switch element ( It is a graph of the pulse waveform of Q3), and the D graph is a graph of the pulse waveform of the fourth switch element Q4.

4 is a graph showing a phase of a pulse current according to another embodiment of the present invention. In addition, the A'graph is a graph of the pulse waveform of the first switching element (Q1), the B'graph is a graph of the pulse waveform of the second switching element (Q2), and the C'graph is the third switch element (Q3). ) Is a graph of the pulse waveform, and the D'graph is a graph of the pulse waveform of the fourth switch element Q4.

3 and 4, it is connected to the third switch element (Q3) and the fourth switch element (Q4), and by controlling the phase shift of the third switch element (Q3) and the fourth switch element (Q4). , It may further include a control unit for controlling the output current.

When the first switch element (Q1) and the fourth switch element (Q4) are simultaneously turned on in the converter unit 110, current flows through the oscillator unit 120, and the second switch element (Q2) and the third switch element (Q3) When) is simultaneously ON, current may flow through the oscillation unit 120. Here, since the first switch element Q1 and the second switch element Q2 must not be turned on at the same time, the phase is always opposite, and the relationship between the third switch element Q3 and the fourth switch element Q4 is the same.

Here, when the phases of the third switch element Q3 and the fourth switch element Q4 are controlled, the fourth switch element Q4 overlaps the first switch element Q1 and the current flow time and the third switch element Q3 ) Overlaps with the second switch element Q2 and the current flow time may be adjusted, and as the overlapping time increases due to such a phase shift, more current may flow toward the oscillator 120. By controlling the amount of current passing through the oscillator 120 as described above, as a result, the amount of output current can be controlled to control the output power.

And, as shown in Figs. 3 and 4, zero current switching is implemented by the switching operation as described above, and accordingly, switching loss due to a relatively high boost ratio in the transformer 130 Can be minimized.

The control unit may control the ON time of the third and fourth switch elements Q3 and Q4 to perform phase shift control on the third and fourth switch elements Q3 and Q4. Matters on the principle thereof are known techniques and detailed descriptions will be omitted.

3 shows that the resonant current a1 is formed relatively small due to a relatively small phase shift, and FIG. 4 shows that the resonant current a2 is formed relatively large due to a relatively large phase shift. 3 and 4, the control unit controls the phase shift of the third switch element Q3 and the fourth switch element Q4 to control the magnitude of the resonant current, and as a result, the magnitude of the output current. I can.

When the functional unit 500 is coupled to the vehicle, the controller may determine an output current value suitable for the functional unit 500 by identifying the identification number of the functional unit 500. In addition, it is possible to calculate a resonant current value suitable for the output current value and control the phase shift of the third switch element Q3 and the fourth switch element Q4 of the converter unit 110 to generate an appropriate resonant current value. .

Accordingly, even if the type of the functional unit 500 is changed, the control unit determines the type of the functional unit 500, calculates an output current suitable for the functional unit 500, and provides the derived output current to the functional unit 500. can do. Here, the functional unit 500 may be driven with a standard voltage of 220V, and when the control unit identifies the functional unit 500 driven by such a standard voltage, an output current suitable for the standard voltage is supplied to the functional unit 500 Can be provided.

The electric power take-off device of the present invention may further include a power pack that charges the battery 200 while the vehicle is running. Here, the power pack may include an engine 320 installed in a vehicle, and a generator 310 that is coupled to the engine 320 and performs power generation by driving the engine 320.

In addition, the electric power take-off device of the present invention may further include a battery charging unit 400 for charging the battery 200 by receiving an external AC current, which is an external AC current, and converting it to DC. When connected to an AC current, power is supplied from the battery charging unit 400 to the battery 200 so that the battery 200 can be charged. When the vehicle is running, power is transferred from the generator 310 to the battery 200. It may be supplied to charge the battery 200.

Since the electric power take-off device of the present invention can be applied to a vehicle that can be combined with the functional unit 500 as described above, an agricultural vehicle comprising the electric power take-off device of the present invention can be manufactured.

Hereinafter, a power take-off method using the electric power take-off device of the present invention will be described.

In the first step, the functional unit 500 may be coupled to the vehicle.

In the second step, the control unit may identify the type of the functional unit 500.

In the third step, the control unit may control the phase shift of the third switch element Q3 and the fourth switch element Q4.

In the fourth step, an output current may be generated and provided to the functional unit 500.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

100: circuit module
110: converter unit
120: oscillation part
130: transformer
140: rectifier
200: battery
310: generator
320: engine
400: battery charging unit
500: functional unit

Claims (10)

A battery provided in the vehicle;
A converter unit connected to the battery, converting a supply current supplied from the battery into a pulse current of a square wave pulse waveform, and including first to fourth switch elements;
An oscillation unit connected to the converter unit to convert the pulse current into a resonance current;
A transformer connected to the oscillator and converting the resonance current into an AC current;
A rectifier connected to the transformer to convert the AC current into an output current, which is a DC current, and supply the output current to a functional unit coupled to the vehicle; And
A control unit connected to the third and fourth switch elements and controlling the resonant current by controlling a phase shift of the third and fourth switch elements, thereby controlling the output current; and ,
When the functional unit is coupled to the vehicle, the control unit determines the identification number of the functional unit, determines the output current value corresponding to the functional unit, and then determines the resonance current value corresponding to the output current value. Calculating and controlling the resonance current to control the output current,
Even if the type of the functional unit is changed, the electrical power take-off device, characterized in that the output current corresponding to the functional unit is provided.
The method according to claim 1,
Electric power take-off device, characterized in that the converter unit is a full bridge (Full Bridge) circuit.
The method according to claim 2,
The first to fourth switch elements are electrical power take-off device, characterized in that formed of a MOSFET (MOSFET) transistor.
delete The method according to claim 1,
The electrical power take-off device, characterized in that the transformer is formed of an insulated transformer.
The method according to claim 1,
Electric power take-off device, characterized in that it further comprises a power pack for charging the battery while the vehicle is driving.
The method of claim 6,
The power pack,
An engine installed in the vehicle, and
An electric power take-off device comprising: a generator coupled to the engine and performing power generation by driving the engine.
The method according to claim 1,
Electrical power take-off device, characterized in that it further comprises a battery charging unit for charging the battery by receiving the external AC current, which is an external AC current, and converting it to DC.
An agricultural vehicle comprising an electric power take-off device according to any one of claims 1 to 3 and 5 to 7.
In the power take-off method using the electrical power take-off device of claim 1,
i) coupling the functional unit to the vehicle;
ii) identifying the type of the functional unit in the control unit;
iii) controlling, by the control unit, a phase shift of the third switch element and the fourth switch element; And
iv) generating the output current and providing it to the functional unit; power withdrawal method using an electric power take-off device comprising: a.

Images