Ignition Wake-Up Circuit

Abstract

An ignition wake-up circuit according to one embodiment of the present invention includes an input node that receives an ignition voltage, an output node that outputs a wake-up voltage, and a voltage detection unit that outputs a wake-up signal according to the magnitude of the ignition voltage, wherein the voltage detection unit outputs the wake-up signal when the ignition voltage changes from a voltage lower than a first reference voltage to a voltage equal to or higher than the first reference voltage, and outputs a low signal when the ignition voltage changes from a voltage higher than a second reference voltage to a voltage equal to or lower than the second reference voltage, and the first reference voltage is higher than the second reference voltage.

Description

[Technical Field]

[0001] The present invention relates to an ignition wake-up circuit, and more particularly to an ignition wake-up circuit capable of stable ignition wake-up operation, and a power conversion device including the same. [Background technology]

[0002] Vehicle inverters use functions such as ignition wake-up to put the inverter into sleep mode when the vehicle is not in operation, minimizing current consumption and preventing battery discharge.

[0003] Although expensive MCUs and PMICs support the ignition wake-up function, 100W-class EOP controllers use low-cost MCUs without the ignition wake-up function to be price competitive, so a separate circuit configuration for the ignition wake-up function is required.

[0004] Circuits for low-cost ignition wake-up functions have a problem of malfunctioning when the ignition voltage has ripples near the threshold voltage of the transistor. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem to be solved by the present invention is to provide an ignition wake-up circuit capable of performing a stable ignition wake-up operation and a power conversion device including the same. [Means for solving the problem]

[0006] In order to solve the above technical problems, an ignition wake-up circuit according to one embodiment of the present invention includes an input node that receives an input of an ignition voltage; an output node that outputs a wake-up voltage; and a voltage detection unit that outputs a wake-up signal according to the magnitude of the ignition voltage, wherein the voltage detection unit outputs the wake-up signal when the ignition voltage changes from a voltage smaller than a first reference voltage to a voltage greater than or equal to the first reference voltage, and outputs a low signal when the ignition voltage changes from a voltage greater than a second reference voltage to a voltage less than or equal to the second reference voltage, and the first reference voltage is greater than the second reference voltage.

[0007] Also, the voltage sensing unit may include a voltage detector IC.

[0008] The wake-up signal may be the ignition voltage.

[0009] The voltage detection unit may also include a first resistor connected in parallel between the input node and the voltage detection unit.

[0010] The voltage detector may also include a clamp unit connected in parallel between the input node and the voltage sensing unit.

[0011] Furthermore, the clamping unit can clamp the ignition voltage to a first voltage or less.

[0012] The clamping unit may include a Zener diode.

[0013] The output node can also be connected to the ADC port of the MCU.

[0014] The voltage detector may also include a second resistor connected in parallel between the output terminal of the voltage detector and the output node.

[0015] In order to solve the above technical problem, an ignition wake-up circuit according to another embodiment of the present invention outputs the input voltage (Vin) as the output voltage (Vout) when the input voltage (Vin) is equal to or greater than a first voltage (VDET+), and outputs 0V as the output voltage (Vout) when the input voltage (Vin) falls below a second voltage (VDET-), and the first voltage (VDET+) is greater than the second voltage (VDET-).

[0016] In order to solve the above technical problems, a power conversion device according to one embodiment of the present invention includes a voltage conversion unit that converts an input voltage and outputs the converted voltage; a control unit that operates the voltage conversion unit; and an ignition wake-up circuit unit that operates the control unit in a sleep mode or a wake-up mode depending on an ignition voltage, and the ignition wake-up circuit unit includes the ignition wake-up circuit. [Effects of the Invention]

[0017] According to an embodiment of the present invention, a hysteresis section can be set by using a voltage detector, and by selecting a voltage detector taking into consideration the threshold voltage value of the AD port of the MCU, it is possible to reliably control the IGN on / off operation even if the IGN voltage is unstable, thereby stabilizing the power supply. Compared to conventional ignition wake-up circuits, the number of components is reduced and optimized, improving price competitiveness. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention. [Figure 2] 4 shows the hysteresis characteristics of the ignition wake-up circuit according to the embodiment of the present invention. [Figure 3] FIG. 1 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention. [Figure 4] 1 illustrates an implementation of an ignition wake-up circuit according to an embodiment of the present invention. [Figure 5] 1 illustrates an application example of an ignition wake-up circuit according to an embodiment of the present invention. [Figure 6] 1 illustrates a comparative example of an ignition wake-up circuit according to an embodiment of the present invention. [Figure 7] 1 is a block diagram of a power conversion device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0020] However, the technical concept of the present invention is not limited to the described embodiments and can be realized in various different forms, and one or more of the components of the embodiments can be selectively combined or replaced within the scope of the technical concept of the present invention.

[0021] Furthermore, unless otherwise clearly and specifically defined, terms (including technical and scientific terms) used in the examples of the present invention should be interpreted as meanings that are commonly understood by a person of ordinary skill in the art to which the present invention belongs, and commonly used terms such as predefined terms should be interpreted in light of the contextual meaning of the relevant art.

[0022] Furthermore, the terms used in the examples of the present invention are intended to explain the examples and are not intended to limit the present invention.

[0023] In this specification, the singular can also include the plural unless otherwise specified in the context, and when it is stated that "A and at least one (or more) of B and C" is used, it can include one or more of all possible combinations of A, B and C.

[0024] Furthermore, when describing components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. are used to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0025] It should be noted that when a component is described as being "coupled," "coupled," or "connected" to another component, this includes not only cases where the component is "coupled," "coupled," or "connected" directly to the other component, but also cases where the component is "coupled," "coupled," or "connected" by yet another component between the component and the other component.

[0026] Furthermore, when described as being formed or disposed "above (above)" or "below (below)" a component, "above (above)" or "below (below)" includes not only the case where two components are in direct contact with each other, but also the case where one or more other components are formed or disposed between the two components. Furthermore, when described as "above (above)" or "below (below)," it can include not only the upper direction but also the lower direction based on one component.

[0027] Modifications of the present embodiments may include some components of each embodiment and some components of other embodiments. That is, a modification may include one embodiment among various embodiments, but omit some components and include some components of the corresponding other embodiment. Or vice versa. Features, structures, effects, etc. described in the embodiments are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. exemplified in each embodiment may be combined or modified with other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, content related to such combinations and modifications should be interpreted as being included within the scope of the embodiments.

[0028] Figure 1 is a block diagram of an ignition wake-up circuit according to one embodiment of the present invention, Figure 2 is a diagram showing the hysteresis characteristics of the ignition wake-up circuit according to an embodiment of the present invention, Figure 3 is a block diagram of the ignition wake-up circuit according to an embodiment of the present invention, Figure 4 is a diagram illustrating an example of implementation of the ignition wake-up circuit according to an embodiment of the present invention, Figure 5 is a diagram illustrating an example of application of the ignition wake-up circuit according to an embodiment of the present invention, and Figure 6 is a diagram illustrating a comparative example of the ignition wake-up circuit according to an embodiment of the present invention.

[0029] The ignition wake-up circuit 100 according to an embodiment of the present invention includes an input node 110, an output node 130, and a voltage sensing unit 120, and may include a first resistor 140, a clamping unit 150, and a second resistor 160.

[0030] The ignition wake-up circuit 100 according to an embodiment of the present invention is a circuit that wakes up the MCU 200. The ignition wake-up circuit 100 may be an ignition wake-up circuit that wakes up the MCU 200 that has been switched to a sleep mode for low power consumption when an ignition voltage is input. Here, the MCU 200 that is woken up may be a control unit of an inverter, and the inverter may be an inverter for driving an EV cooling EOP (Electric Oil Pump) motor. Of course, the ignition wake-up circuit 100 may be applied to various other devices that include a wake-up function using an ignition voltage.

[0031] An input node 110 receives an ignition voltage, a voltage detector 120 outputs a wake-up signal according to the magnitude of the ignition voltage, and an output node 130 outputs the wake-up voltage.

[0032] The voltage sensing unit 120 outputs the wake-up signal when the ignition voltage changes from a voltage lower than a first reference voltage to a voltage equal to or higher than the first reference voltage, and outputs a low signal when the ignition voltage changes from a voltage higher than a second reference voltage to a voltage equal to or lower than the second reference voltage. Here, the first reference voltage may be a voltage higher than the second reference voltage.

[0033] Here, the ignition voltage is a voltage generated when the ignition is turned on, and may be generated when the vehicle is started. When the ignition is turned off, a module or device in the vehicle that has been switched to a sleep mode can be woken up using the ignition voltage.

[0034] When the ignition voltage exceeds a reference voltage, a wake-up signal is output. However, if the ignition voltage is the reference voltage and ripples exist, the wake-up function may malfunction or become unstable. In particular, when the ignition voltage changes only slightly, the ripples around the reference voltage may cause the ignition voltage to repeatedly rise and fall above and below the reference voltage, resulting in malfunctions and other problems. To solve this problem, the voltage sensing unit 120 outputs a wake-up signal using a first reference voltage and a second reference voltage.

[0035] The voltage sensing unit 120 uses the first and second reference voltages to form a hysteresis characteristic and stably perform the wake-up function. That is, the first and second reference voltages, which are different from each other, are used depending on the direction of the ignition voltage change. Here, the first reference voltage may be set to a voltage higher than the second reference voltage.

[0036] More specifically, the voltage sensing unit 120 outputs the wake-up signal when the ignition voltage changes from a voltage lower than a first reference voltage to a voltage higher than the first reference voltage, and outputs a low signal when the ignition voltage changes from a voltage higher than a second reference voltage to a voltage lower than the second reference voltage.

[0037] When an ignition voltage is input, the ignition voltage may increase. If the ignition voltage changes from a voltage lower than the first reference voltage to a voltage higher than the first reference voltage, a wake-up signal is output when the ignition voltage exceeds the first reference voltage. In other words, when the ignition voltage increases, the first reference voltage is the reference voltage for outputting the wake-up signal.

[0038] Conversely, if the ignition voltage decreases, when the ignition voltage exceeds the first reference voltage and outputs a wake-up signal, and then decreases from a voltage greater than the second reference voltage to a voltage less than the second reference voltage, a low signal, not a wake-up signal, is output when the ignition voltage drops below the second reference voltage. In other words, when the ignition voltage decreases, the second reference voltage is the reference voltage for outputting a low signal.

[0039] That is, when the wake-up function is turned on, it is compared with a larger reference voltage, and when the wake-up function is turned off, it is compared with a smaller reference voltage, thereby creating a difference in the voltage that turns the wake-up on / off, thereby preventing the wake-up function from malfunctioning due to changes caused by ripples in a specific voltage.

[0040] 2 illustrates the output voltage (Vout) output in response to the input voltage (Vin) input to the input node of the voltage sensing unit 120. For example, as shown in FIG. 2, Vin changes from decreasing to increasing, and in this case, in the decreasing direction, it changes from a voltage greater than the second reference voltage (VDET-) to a voltage less than the second reference voltage (VDET-), and in the increasing direction, it changes from a voltage less than the first reference voltage (VDET+) to a voltage less than the first reference voltage (VDET+).

[0041] The voltage detector 120 may output the input ignition voltage as a wake-up voltage when the wake-up function is on, and may output a low signal when the wake-up function is off. Here, the low signal may be 0V or a preset voltage. The voltage detector 120 may also output a high signal when the wake-up function is on. Here, the high signal may be a signal with a voltage higher than the low signal and may be a preset voltage.

[0042] The voltage sensing unit 120 may include a voltage detector IC and may set a hysteresis interval between the first reference voltage (VDET+) and the second reference voltage (VDET-).

[0043] As the voltage decreases, the second reference voltage becomes the reference voltage that turns off the wake-up function. Before the wake-up function is turned off, when it is on, the output voltage (Vout) corresponds to the input voltage (Vin), and when the input voltage (Vin) gradually decreases and falls below the second reference voltage (VDET-), a low signal of 0V is output.

[0044] Conversely, when the voltage increases, the first reference voltage becomes the reference voltage that turns on the wake-up function. Before the wake-up function is turned on, when it is off, the output voltage (Vout) is 0V, which is a low signal. When the input voltage (Vin) gradually increases and becomes equal to or greater than the first reference voltage (VDET+), the output voltage (Vout) is output in accordance with the input voltage (Vin), and a wake-up signal is output.

[0045] In this way, the hysteresis section is realized using the first and second reference voltages, and therefore, even if a ripple occurs in the ignition voltage between the first and second reference voltages, the existing state can be maintained to prevent malfunction.

[0046] The ignition wake-up circuit 100 may include a first resistor 140 connected in parallel between the input node 110 and the voltage sensing unit 120. The first resistor 140 is connected in parallel to the input node 110 and can quickly consume the voltage remaining in the circuit when the ignition is turned off. This allows the ignition wake-up circuit 100 to ensure a falling time. For example, the voltage in the circuit must fall below a predetermined voltage within 20 ms after the ignition is turned off. The resistance value of the first resistor 140 is set according to the magnitude of the ignition voltage and the falling time, or can be set by the user.

[0047] The ignition wake-up circuit 100 may include a clamp unit 150 connected in parallel between the input node 110 and the voltage sensing unit 120. When an ignition voltage equal to or greater than the operating voltage is input to the input node 110, the clamp unit 150 may clamp the ignition voltage to a first voltage or less. For example, the clamp unit may clamp the ignition voltage input to the input node 110 to 5V. Clamping the input voltage acts as if a constant voltage were input, thereby enabling the ignition wake-up circuit 100 to operate more stably.

[0048] The clamp unit 150 may include a Zener diode. As shown in FIG. 4, the Zener diode may be connected in the reverse direction. When the reverse bias voltage applied to the Zener diode in the reverse direction becomes larger than the Jenner breakdown voltage, a large current flows due to the Jenner breakdown, clamping the voltage. This allows the input voltage to be clamped below the first voltage. The clamp unit 150 may include a TVS diode or a circuit or component that performs clamping operation in addition to the Zener diode.

[0049] A diode 320 connected in series with the input node 110 may be included in the stage preceding the input node 110 to prevent current from flowing in the reverse direction. The anode is connected in the direction in which the ignition voltage is input, and the cathode is connected to the input node 110, thereby preventing current from flowing from the ignition wakeup circuit 100 in the ignition direction.

[0050] The output node 130 may be connected to an ADC port 210 of the MCU 200. Here, the ADC port 210 is an ADC (Analog-to-Digital) port that converts analog signals into digital signals, and is also referred to as an AD port. The maximum input voltage of the ADC port is 5V, and as described above, the clamp unit can clamp the input voltage to 5V to prevent damage to the ADC port 210. When the ignition voltage becomes greater than the first reference voltage, the ignition voltage, which is a wake-up voltage, is input to the ADC port 210, and the MCU 200 can wake up.

[0051] The first and second reference voltages of the voltage sensing unit 120 are set using the threshold voltage value of the ADC port 210 of the MCU 200, so that even if the ignition voltage is unstable, the on / off operation of the ignition wake-up can be reliably controlled, thereby stabilizing the power supply.

[0052] The voltage detection circuit may include a second resistor 160 connected in parallel between the voltage detection unit 120 and the output node 130. The second resistor 160 is connected in parallel between the output terminal of the voltage detection unit 120 and the output node 130 and can adjust the current consumption of the ignition voltage connecting line. When the voltage output from the voltage detection unit 120 is input to the ADC port 210, a large current may flow through the connecting line, but the second resistor 160 can consume the current to adjust the current consumption of the ignition voltage connecting line. The resistance value of the second resistor 160 is set according to the magnitude of the ignition voltage and the rated current of the connecting line or the ADC port, or can be set by the user.

[0053] The ignition wake-up circuit 100 according to an embodiment of the present invention may be applied to wake up the MCU 200, as shown in FIG. 5. FIG. 5 illustrates an example of an inverter ignition wake-up circuit for driving an ISG EOP motor. The ignition wake-up circuit 100 is connected to a battery voltage VBAT 410 and an ignition voltage Ignition 310, and can input its output to the ADC port 210 of the MCU 200. The battery voltage 430 may be applied to the inverter via a reverse polarity protection circuit. A ground GND 510 can provide a ground for the circuit. A TVS diode 430 can be connected in parallel to the battery voltage 430 to clamp large voltages. When the battery voltage and the ignition voltage are applied to the ignition wakeup circuit 100, a wakeup signal output from the ignition wakeup circuit 100 according to the magnitude of the ignition voltage can be input to the ADC port 210 of the MCU 200 to wake up the MCU 200.

[0054] As shown in FIG. 6, an ignition wake-up circuit 10 can be configured using NPN and PNP transistors 11 and 12. In this case, diodes 13 and 14 can be connected in front of each transistor to configure the circuit. When an ignition voltage 310 is input, a battery voltage 410 operates an internal voltage regulator 220 of the MCU 200 to generate a 5V or 3.3V power supply, thereby waking up the MCU 200. However, if the ignition voltage has ripples near the threshold voltages of the transistors 11 and 12, malfunctions may occur. Furthermore, passive elements such as resistors and MLCCs are required to drive the transistors, which is disadvantageous in terms of price competitiveness and product miniaturization compared to an embodiment using the ignition wake-up circuit 100 according to the present invention. That is, two transistors 11 and 12 and a large number of surrounding resistors and MLCCs are required, but the ignition wake-up circuit 100 according to an embodiment of the present invention can replace these components with a Zener diode and a voltage detector IC, thereby reducing the number of components and optimizing the circuit to form a price-competitive circuit.

[0055] FIG. 7 is a block diagram of a power conversion device according to an embodiment of the present invention.

[0056] A power conversion device 700 according to an embodiment of the present invention includes an ignition wake-up circuit unit 710, a control unit 720, and a voltage conversion unit 730. Here, the voltage conversion unit 730 converts and outputs an input voltage, and the control unit 720 operates the voltage conversion unit 730. The ignition wake-up circuit unit 710 operates the control unit 720 in a sleep mode or a wake-up mode depending on the ignition voltage. The voltage conversion unit includes one or more switching elements, and the control unit can convert the input voltage by controlling the on / off of the switching elements. A detailed description of the ignition wake-up circuit unit 710 corresponds to the detailed description of the ignition wake-up circuit 100 of FIGS. 1 to 6, so a duplicated description will be omitted below.

[0057] The control unit 720 may be an MCU, and the voltage conversion unit 730 may be an inverter or an inverter for driving an EV cooling EOP (Electric Oil Pump) motor.

[0058] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, the content related to such combinations and modifications should be interpreted as being included in the scope of the embodiments.

[0059] Those skilled in the art will understand that the present invention can be realized in various modified forms without departing from the essential characteristics of the above description. Therefore, the disclosed method should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims, not the foregoing description, and all differences within the scope of the claims should be construed as being within the scope of the present invention.

Claims

1. an input node for receiving an ignition voltage; an output node that outputs a wake-up voltage; a voltage detector that outputs a wake-up signal according to the magnitude of the ignition voltage; The voltage sensing unit outputting the wake-up signal when the ignition voltage changes from a voltage lower than a first reference voltage to a voltage equal to or higher than the first reference voltage; outputting a low signal when the ignition voltage changes from a voltage greater than a second reference voltage to a voltage equal to or less than the second reference voltage; The first reference voltage is greater than the second reference voltage.

2. The ignition wake-up circuit according to claim 1 , wherein the voltage sensing unit includes a voltage detector IC.

3. The ignition wake-up circuit of claim 1 , wherein the wake-up signal is the ignition voltage.

4. 2. The ignition wake-up circuit of claim 1, further comprising a first resistor connected in parallel between the input node and the voltage sensing portion.

5. 2. The ignition wake-up circuit of claim 1, further comprising a clamp section connected in parallel between said input node and said voltage sensing section.

6. 6. The ignition wake-up circuit of claim 5, wherein the ignition voltage is clamped to a first voltage or less.

7. The ignition wake-up circuit according to claim 1 , wherein the clamping section includes a Zener diode.

8. The ignition wake-up circuit of claim 1 , wherein the output node is connected to an ADC port of an MCU.

9. 2. The ignition wake-up circuit of claim 1, further comprising a second resistor connected in parallel between the output terminal of the voltage sensing unit and the output node.

10. When the input voltage (Vin) is equal to or greater than the first voltage (VDET+), the output voltage (Vout) is equal to the input voltage (Vin), and when the input voltage (Vin) drops below the second voltage (VDET-), the output voltage (Vout) is 0V. The first voltage (VDET+) is greater than the second voltage (VDET-).

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