Ignition wake-up circuit

Abstract

According to an embodiment of the present invention, an ignition wake-up circuit includes: an input node receiving an ignition voltage as an input; an output node outputting a wake-up voltage; and the voltage sensing unit outputs a wake-up signal according to the magnitude of the ignition voltage. The voltage sensing unit outputs a wake-up signal when the ignition voltage reaches a voltage level greater than or equal to the first reference voltage from a voltage less than the first reference voltage, and outputs a low signal when the ignition voltage reaches a voltage level less than or equal to the second reference voltage from a voltage greater than the second reference voltage, and the first reference voltage is greater 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 performing a stable ignition wake-up operation and a power conversion device including the ignition wake-up circuit. Background Art

[0002] Vehicle inverters use features such as ignition wake-up to put the inverter into a sleep mode when not in operation to minimize current consumption, thereby preventing battery discharge.

[0003] Expensive devices such as MCUs and PMICs support the ignition wake-up function. However, since 100W EOP controllers use low-cost MCUs without the ignition wake-up function for price competitiveness, a separate circuit configuration for the ignition wake-up function is required.

[0004] A circuit for a low-cost ignition wake-up function has a problem in that the ignition voltage causes malfunction when a ripple exists near a threshold voltage value of a transistor. Summary of the Invention

[0005] Technical Topics

[0006] 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 ignition wake-up circuit.

[0007] Technical Solution

[0008] According to an embodiment of the present invention, an ignition wake-up circuit includes: an input node, receiving an ignition voltage as an input; an output node, outputting a wake-up voltage; and a voltage sensing unit, outputting a wake-up signal according to the size of the ignition voltage, wherein when the ignition voltage reaches a voltage greater than or equal to the first reference voltage from a voltage less than a first reference voltage, the voltage sensing unit outputs a wake-up signal, and when the ignition voltage reaches a voltage less than or equal to the second reference voltage from a voltage greater than a second reference voltage, the voltage sensing unit outputs a low signal, and the first reference voltage is greater than the second reference voltage.

[0009] In addition, the voltage sensing unit may include a voltage detector IC.

[0010] Furthermore, the wake-up signal may be an ignition voltage.

[0011] Furthermore, the ignition wake-up circuit may include a first resistor connected in parallel between the input node and the voltage sensing unit.

[0012] Furthermore, the ignition wake-up circuit may include a clamping unit connected in parallel between the input node and the voltage sensing unit.

[0013] In addition, the clamping unit may clamp the ignition voltage to be below the first voltage.

[0014] Furthermore, the clamping unit may include a Zener diode.

[0015] In addition, the output node can be connected to the ADC port of the MCU.

[0016] In addition, the ignition wake-up circuit may include a second resistor connected in parallel between the output terminal of the voltage sensing unit and the output node.

[0017] In order to solve the above technical problems, in an ignition wake-up circuit according to another embodiment of the present invention, when the input voltage Vin is higher than the first voltage VDET+, the output voltage Vout outputs the input voltage Vin, and when the input voltage Vin is lower than the second voltage VDET-, the output voltage Vout outputs 0V, and wherein the first voltage VDET+ is higher than the second voltage VDET-.

[0018] In order to solve the above technical problems, a power conversion device according to an embodiment of the present invention includes: a voltage conversion unit, which converts and outputs an input voltage; a control unit, which operates the voltage conversion unit; and an ignition wake-up circuit unit, which operates the control unit in a sleep mode or a wake-up mode according to the ignition voltage, wherein the ignition wake-up circuit unit includes the above-mentioned ignition wake-up circuit.

[0019] Beneficial effects

[0020] According to an embodiment of the present invention, a hysteresis section can be set by using a voltage detector. If the voltage detector is selected by considering the threshold voltage value of the AD port of the MCU, the IGN on / off operation can be reliably controlled even if the IGN voltage is unstable, thereby stabilizing the power supply. Compared with existing ignition wake-up circuits, the number of components is reduced and optimized, thereby improving price competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention.

[0022] Figure 2 is a graph showing hysteresis characteristics of an ignition wake-up circuit according to an embodiment of the present invention.

[0023] Figure 3 FIG. 4 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention.

[0024] Figure 4 An implementation example of an ignition wake-up circuit according to an embodiment of the present invention is shown.

[0025] Figure 5An application example of the ignition wake-up circuit according to an embodiment of the present invention is shown.

[0026] Figure 6 A comparative example of an ignition wake-up circuit according to an embodiment of the present invention is shown.

[0027] Figure 7 is a block diagram of a power conversion apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0029] However, the technical concept of the present invention is not limited to some embodiments to be described, but can be implemented in various forms, and within the scope of the technical concept of the present invention, one or more of the constituent elements can be selectively combined or replaced between the embodiments.

[0030] In addition, unless explicitly defined and described, the terms (including technical terms and scientific terms) used in the embodiments of the present invention may be interpreted as meanings that can be generally understood by those skilled in the art, and commonly used terms (such as terms defined in dictionaries) may be interpreted in consideration of their meanings in the context of the relevant technology.

[0031] Furthermore, the terms used in this specification are for describing the embodiments and are not intended to limit the present invention.

[0032] In this specification, unless specifically stated otherwise in a phrase, a singular form may include a plural form, and when described as "at least one (or more than one) of A, B, C", this may include one or more of all combinations that can be formed by combining A, B and C.

[0033] In addition, when describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only intended to distinguish a component from other components, and the nature, order, or sequence of these components is not limited by these terms.

[0034] Furthermore, when a component is described as being “connected,” “coupled,” or “interconnected” with another component, the component is not only directly connected, coupled, or interconnected with the other component, but may also include situations where the component is “connected,” “coupled,” or “interconnected” due to other components between the component and the other component.

[0035] In addition, when described as being formed or disposed “on (above)” or “under (below)” each component, “on (above)” or “under (below)” is intended to include not only a case where the two components are in direct contact, but also a case where one or more other components are formed or disposed between the two components. Furthermore, when expressed as “on (above)” or “under (below)”, it can include not only a meaning based on an upward direction of one component, but also a meaning based on a downward direction of one component.

[0036] The modified embodiment according to the present embodiment may include some components of each embodiment and some components of other embodiments. That is, the modified embodiment may include one embodiment in the various embodiments, but may omit some components and include some components of corresponding other embodiments. Alternatively, the opposite may also be true. The features, structures, effects, etc. described in the embodiments are included in at least one embodiment and are not necessarily limited to one embodiment. In addition, the features, structures, effects, etc. illustrated in each embodiment may be combined or modified and implemented in other embodiments by a person of ordinary skill in the art to which the embodiments belong. Therefore, the content related to such combinations and modifications should be interpreted as being included in the scope of the embodiments.

[0037] Figure 1 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention; Figure 2 is a diagram showing hysteresis characteristics of an ignition wake-up circuit according to an embodiment of the present invention; Figure 3 is a block diagram of an ignition wake-up circuit according to an embodiment of the present invention; Figure 4 An implementation example of an ignition wake-up circuit according to an embodiment of the present invention is shown; Figure 5 An application example of the ignition wake-up circuit according to an embodiment of the present invention is shown; and Figure 6 A comparative example of an ignition wake-up circuit according to an embodiment of the present invention is shown.

[0038] The ignition wake-up circuit 100 according to one embodiment of the present invention is configured with 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 .

[0039] The ignition wake-up circuit 100 according to an embodiment of the present invention is a circuit for waking up the MCU 200. The ignition wake-up circuit 100 may be an ignition wake-up circuit that wakes up the MCU 200, which has switched to a sleep mode for low power consumption, when an ignition voltage is input. Here, the awakened MCU 200 may be a control unit of an inverter, and the inverter may be an inverter for driving an electric oil pump (EOP) motor for cooling an EV. It is apparent that the circuit can be applied to various devices that include a wake-up function utilizing an ignition voltage.

[0040] The input node 110 receives an ignition voltage, the voltage sensing unit 120 outputs a wake-up signal according to the magnitude of the ignition voltage, and the output node 130 outputs the wake-up voltage.

[0041] When the ignition voltage changes from a voltage lower than the first reference voltage to a voltage higher than the first reference voltage, the voltage sensing unit 120 outputs a wake-up signal, and when the ignition voltage changes from a voltage higher than the second reference voltage to a voltage lower than the second reference voltage, the voltage sensing unit 120 outputs a low signal. Here, the first reference voltage may be a voltage higher than the second reference voltage.

[0042] Here, the ignition voltage is a voltage that appears when the ignition is driven, and may appear when the vehicle is started. When the ignition is turned off, the ignition voltage when the ignition is turned on may be used to wake up an internal module or device of the vehicle that has switched to a sleep mode.

[0043] When the ignition voltage becomes higher than the reference voltage, a wake-up signal is output. However, if the ignition voltage has ripple at the reference voltage, the wake-up function may malfunction or become unstable. In particular, when the ignition voltage changes slightly, the voltage may repeatedly increase and decrease compared to the reference voltage due to ripple near the reference voltage, which may cause problems such as malfunction. To address this issue, voltage sensing unit 120 outputs a wake-up signal using a first reference voltage and a second reference voltage.

[0044] The voltage sensing unit 120 can stably perform the wake-up function by forming a hysteresis characteristic using the first reference voltage and the second reference voltage. That is, the first reference voltage and the second reference voltage are used as different reference voltages according to the direction of the change in the ignition voltage. Here, the first reference voltage can be set to be greater than the second reference voltage.

[0045] More specifically, when the ignition voltage changes from a voltage lower than the first reference voltage to a voltage higher than the first reference voltage, the voltage sensing unit 120 outputs a wake-up signal, and when the ignition voltage changes from a voltage higher than the second reference voltage to a voltage lower than the second reference voltage, the voltage sensing unit 120 outputs a low signal.

[0046] When the ignition voltage is input, the ignition voltage may increase. When the ignition voltage changes from a voltage lower than a first reference voltage to a voltage higher than the first reference voltage, the wake-up signal is output when the ignition voltage becomes higher than the first reference voltage. In other words, the first reference voltage is a voltage used as a reference for outputting the wake-up signal in the direction in which the ignition voltage increases.

[0047] Conversely, the ignition voltage may decrease. When the ignition voltage is greater than the first reference voltage and a wake-up signal is output, if the ignition voltage decreases and changes from a voltage greater than the second reference voltage to a voltage less than the second reference voltage, a low signal is output instead of the wake-up signal when the ignition voltage becomes lower than the second reference voltage. In other words, the second reference voltage is a reference voltage used to output a low signal in the direction in which the ignition voltage decreases.

[0048] 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 generating a difference between the voltages used to turn the wake-up function on and off, thereby preventing the wake-up function from malfunctioning due to changes in ripple at a specific voltage.

[0049] Figure 2 1 shows an output voltage Vout output according to an input voltage Vin input to an input node of the voltage sensing unit 120. For example, Vin may have a change from decreasing to increasing again, as shown in FIG. Figure 2 As shown, however, at this time, in the decreasing direction, Vin can change 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, Vin can change from a voltage less than the first reference voltage VDET+ to a voltage less than the first reference voltage VDET+.

[0050] The voltage sensing unit 120 can output the input ignition voltage as the wake-up voltage when the wake-up function is turned on, and output a low signal when the wake-up function is turned off. Here, the low signal can be 0V or a preset voltage. The voltage sensing unit 120 can also output a high signal when the wake-up function is turned on. Here, the high signal is a signal with a higher voltage than the low signal and can be a preset voltage.

[0051] The voltage sensing unit 120 may include a voltage detector IC, and may set a hysteresis interval of the first reference voltage VDET+ and the second reference voltage VDET−.

[0052] In the direction of voltage reduction, the second reference voltage becomes the reference voltage for turning off the wake-up function. Before the wake-up function is turned off, when the wake-up function is turned on, the output voltage Vout is output in response to the input voltage Vin, and when the input voltage Vin gradually decreases and becomes lower than the second reference voltage VDET-, a low signal of 0V is output.

[0053] Conversely, in the direction of voltage increase, the first reference voltage becomes the reference voltage for activating the wake-up function. Before the wake-up function is activated, in the wake-up function off state, the output voltage Vout outputs a low signal of 0V. However, when the input voltage Vin gradually increases and becomes higher 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.

[0054] In this way, the hysteresis section is implemented using the first reference voltage and the second reference voltage, whereby even if the ignition voltage ripples between the first reference voltage and the second reference voltage, the existing state can be maintained, thereby preventing malfunction.

[0055] A first resistor 140 may be included, 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 dissipate the remaining voltage in the circuit when the ignition is turned off. Thus, the ignition wake-up circuit 100 can ensure a fall time. For example, the voltage in the circuit must fall below a predetermined voltage within 20 milliseconds from the time the ignition is turned off. The resistance value of the first resistor 140 can be set based on the magnitude of the ignition voltage and the fall time, or can be set by the user.

[0056] A clamping unit 150 may be included, connected in parallel between the input node 110 and the voltage sensing unit 120. When an ignition voltage higher than the operating voltage is input to the input node 110, the clamping unit 150 may clamp the ignition voltage to a first voltage or lower. For example, the clamping unit may clamp the ignition voltage input to the input node 110 to 5V. By clamping the input voltage to the same as the input constant voltage, the ignition wake-up circuit 100 can operate more stably.

[0057] The clamping unit 150 may include a Zener diode. Figure 4 As shown, the Zener diode can be connected in reverse. When the reverse bias voltage applied to the Zener diode becomes greater than the Zener breakdown voltage, the input voltage can be clamped below the first voltage by utilizing the characteristic that the voltage is clamped when a large current flows due to Zener breakdown. In addition to the Zener diode, the clamping unit 150 may also include a TVS diode or a circuit or component that performs a clamping operation.

[0058] To prevent current from flowing in the reverse direction, a diode 320 connected in series with the input node 110 may be included in front of the input node 110. The anode is connected to the direction of the input ignition voltage and the cathode is connected to the input node 110, so that current can be prevented from flowing in the ignition direction from the ignition wake-up circuit 100.

[0059] The output node 130 can be connected to the ADC port 210 of the MCU 200. Here, the ADC port 210 is an analog-to-digital (ADC) 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 clamping unit can prevent the ADC port 210 from being damaged by clamping the input voltage to 5V. When the ignition voltage becomes greater than the first reference voltage, the ignition voltage as the wake-up voltage is input to the ADC port 210, so that the MCU 200 can wake up.

[0060] By using the threshold voltage value of the ADC port 210 of the MCU 200, the first reference voltage and the second reference voltage of the voltage sensing unit 120 can be set, so that even if the ignition voltage is unstable, the ignition wakeup on / off operation can be reliably controlled to stabilize the power supply.

[0061] A second resistor 160 may be included that is connected in parallel between the voltage sensing unit 120 and the output node 130. The second resistor 160 is connected in parallel between the output terminal of the voltage sensing unit 120 and the output node 130 and can control the current consumption of the ignition voltage connection line. When the voltage sensing unit 120 outputs and inputs to the ADC port 210, a large current may flow in the connection line, and the second resistor 160 consumes the current to control the current consumption of the ignition voltage connection line. The resistance value of the second resistor 160 can be set according to the size of the ignition voltage and the rated current of the connection line or the ADC port, or can be set by the user.

[0062] The ignition wake-up circuit 100 according to the embodiment of the present invention can be applied to Figure 5 The wake-up function of the MCU 200 is shown. Figure 5 This is an implementation example of an inverter ignition wake-up circuit for driving an ISG EOP motor. The ignition wake-up circuit 100 is connected to the battery voltage VBAT 410 and the ignition voltage (Ignition) 310, and its output can be input to the ADC port 210 of the MCU 200, and the battery voltage is input to the battery voltage VBAT 410. The battery voltage 430 can be applied to the inverter through the reverse polarity protection circuit. The ground GND 510 can provide grounding for the circuit. The TVS diode 430 can be connected in parallel to the battery voltage 430 to clamp the large input voltage. When the battery voltage and the ignition voltage are applied to the ignition wake-up circuit 100, the wake-up signal output from the ignition wake-up circuit 100 according to the size of the ignition voltage can be input to the ADC port 210 of the MCU 200 to wake up the MCU 200.

[0063] like Figure 6As shown, the ignition wake-up circuit 10 can be configured using NPN and PNP transistors 11 and 12. In this case, the circuit can be configured by connecting diodes 13 and 14 in front of each transistor. When the ignition voltage 310 is input, the battery voltage 410 operates the internal voltage regulator 220 of the MCU 200 to generate a 5V or 3.3V power supply to wake up the MCU 200. However, when the ignition voltage has ripple near the critical voltage value of transistors 11 and 12, malfunctions may occur, and passive components such as resistors and MLCCs are required to drive the transistors, making the ignition wake-up circuit 100 according to an embodiment of the present invention disadvantageous in terms of price competitiveness and product miniaturization. That is, although two transistors 11 and 12 are required, as well as a large number of resistors and MLCCs surrounding them, the ignition wake-up circuit 100 according to an embodiment of the present invention can reduce and optimize the number of components by replacing the relevant components with Zener diodes and voltage detector ICs, thereby configuring a cost-competitive circuit.

[0064] Figure 7 is a block diagram of a power conversion apparatus according to an embodiment of the present invention.

[0065] The power conversion device 700 according to one 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 the 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 according to the ignition voltage. The voltage conversion unit 730 includes one or more switching elements, and the control unit 720 can convert the input voltage by controlling the switching elements to be turned on and off. The detailed description of the ignition wake-up circuit unit 710 corresponds to Figures 1 to 6 The detailed description of the ignition wake-up circuit 100 is omitted below, and therefore, any repeated description will be omitted below. The control unit 720 may be an MCU, and the voltage conversion unit 730 may be an inverter and an inverter for driving an EV cooling electric oil pump (EOP) motor.

[0066] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment and are not necessarily limited to one embodiment. In addition, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified by a person skilled in the art to which the embodiment belongs and implemented in other embodiments. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the embodiment.

[0067] Those skilled in the art will appreciate that the above description may be implemented in a modified form without departing from its essential characteristics. Therefore, the disclosed method should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated by the claims, rather than by the above description, and all differences within the scope of equivalence thereof should be interpreted as included in the present invention.

Claims

1. An ignition wake-up circuit, comprising: An input node, receiving the ignition voltage; Output node, output wake-up voltage; as well as A voltage sensing unit outputs a wake-up signal according to the magnitude of the ignition voltage, wherein, when the ignition voltage reaches a voltage greater than or equal to the first reference voltage from a voltage less than the first reference voltage, the voltage sensing unit outputs the wake-up signal; and When the ignition voltage reaches a voltage less than or equal to the second reference voltage from a voltage greater than the second reference voltage, the voltage sensing unit outputs a low signal, Wherein, 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 according to claim 1, wherein: The wake-up signal is the ignition voltage.

4. The ignition wake-up circuit according to claim 1, comprising: A first resistor is connected in parallel between the input node and the voltage sensing unit.

5. The ignition wake-up circuit according to claim 1, comprising: The clamping unit is connected in parallel between the input node and the voltage sensing unit.

6. The ignition wake-up circuit according to claim 5, wherein: The clamping unit clamps the ignition voltage to a first voltage or less.

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

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

9. The ignition wake-up circuit according to claim 1, comprising: A second resistor is connected in parallel between the output terminal of the voltage sensing unit and the output node.

10. An ignition wake-up circuit, wherein: When the input voltage Vin is greater than or equal to the first voltage VDET+, the output voltage Vout outputs the input voltage Vin, and when the input voltage Vin is less than or equal to the second voltage VDET-, the output voltage Vout outputs 0V, and The first voltage VDET+ is greater than the second voltage VDET-.

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