WO2023113154A1 - 아날로그 출력 회로 및 이를 구비한 인버터 - Google Patents
아날로그 출력 회로 및 이를 구비한 인버터 Download PDFInfo
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- WO2023113154A1 WO2023113154A1 PCT/KR2022/013469 KR2022013469W WO2023113154A1 WO 2023113154 A1 WO2023113154 A1 WO 2023113154A1 KR 2022013469 W KR2022013469 W KR 2022013469W WO 2023113154 A1 WO2023113154 A1 WO 2023113154A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/258—Indexing scheme relating to amplifiers the input of the amplifier has voltage limiting means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/444—Diode used as protection means in an amplifier, e.g. as a limiter or as a switch
Definitions
- the present invention relates to an analog output circuit and an inverter having the same, and more particularly, to an analog output circuit implemented to prevent an abnormal output occurring in a transient state of power ON/OFF and an inverter including the same.
- the inverter includes an analog output circuit having an analog output function. That is, in the inverter, the output frequency command of the inverter and the state values of various inverters are converted into analog signals and output through a terminal of an analog output circuit (hereinafter referred to as an "analog output terminal"), and output from these analog output terminals The analog output signal is transferred to the upper controller or external device.
- analog output terminal is in the range of 0 V (volt) to EV (volt) (where E is a real number of 1 or more) (eg, 0 V to 4 V).
- 1 shows an output circuit of a bi-directional output inverter.
- such a bi-directional output inverter includes an operational amplifier (Op-Amp) in an analog output circuit (hereinafter, referred to as “first prior art”) for bi-directional output.
- the operational amplifier (Op-Amp) amplifies the unidirectional signal input to terminal A based on the offset signal of terminal B, and outputs the amplified bidirectional analog signal to terminal C (ie, analog output terminal).
- the analog output signal is output in the form of a bi-directional signal, it is amplified by the Op-Amp during a transient state of power ON or OFF (in particular, a transient state of OFF) at the analog output terminal (C). Abnormal output may occur. According to this abnormal output, a signal of wrong information is transmitted to the upper controller or external device connected to the analog output terminal (C), and thus, a serious problem may occur in the inverter system or external system.
- an object of the present invention is to provide an analog output circuit technology for preventing the generation of abnormal output during a transient state of power ON/OFF.
- Another object of the present invention is to provide an analog output circuit technology capable of preventing the occurrence of an abnormal output during a power ON/OFF transient state more conveniently using low-cost components.
- An analog output circuit for solving the above problems is to amplify the difference between the first input terminal to which the output voltage line is connected and the second input terminal to which the offset voltage line is connected to -E 1 V ( Volt) to E 2 V (volts) (however, E 1 and E 2 are real numbers greater than or equal to 1)
- a circuit comprising: a first switch unit having one end connected to the first and second input terminals and the other end connected to ground to switch between the one end and the other end; and a control unit generating a control signal for controlling switching of the first switch unit.
- the first switch unit may act to apply the output voltage and the offset voltage to the first and second input terminals, respectively, when in an OFF state, and act to bring the first and second input terminals to a ground state when in an ON state.
- the first switch unit may be for unidirectional signal transmission in the range of 0 V to E V (where E is a real number greater than 0) when in an ON state.
- the control unit may generate the control signal when the power of the power supply unit of the electronic device is turned on and may not generate the control signal when the power supply unit of the electronic device is turned off.
- the first switch unit may be in the OFF state when the control signal is input, and may be in the ON state when the control signal is not input.
- the operational amplifier may include a first power terminal receiving a first power supply of a positive (+) voltage and a second power terminal receiving a second power supply of a negative (-) voltage.
- An analog output circuit includes a second switch unit connected to a line of the first power terminal and switching whether or not to supply the first power according to the control signal of the control unit; and a third switch unit connected to a line of the second power terminal and switching whether or not to supply the second power according to the control signal of the control unit.
- Each of the second and third switch units may be implemented as a photo coupler.
- the control signal acts as an input to the light emitting element of each photo coupler of the second and third switch units, and the light receiving element of the photo coupler of the second switch unit is connected to a line of the first power terminal, and the A light receiving element of the photo coupler of the second switch unit may be connected to a line of the second power terminal.
- the second and third switch units act to input the first and second power sources to the operational amplifier when the control signal is input, and the second and third switch units act to input the control signal when the control signal is not input.
- the first and second power sources may act to be cut off.
- the electronic device may be an inverter.
- An inverter is an inverter including an analog output circuit for outputting a bidirectional analog signal.
- the analog output circuit amplifies the difference between the first input terminal to which the output voltage line is connected and the second input terminal to which the offset voltage line is connected, -E 1 V (volt) to E 2 V (volt) range (however, E 1 and E 2 are real numbers greater than or equal to 1) of an operational amplifier outputting a bidirectional analog signal from an output terminal (Op-Amp); a first switch unit having one end connected to the first and second input terminals and the other end connected to ground to switch between the one end and the other end; and a control unit generating a control signal for controlling the switching of the first switch unit, wherein when the first switch unit is in an OFF state, the output voltage and the offset voltage are applied to first and second input terminals, respectively. and when in an ON state, the first and second input terminals may act to be in a ground state.
- the present invention configured as described above has an advantage of preventing abnormal output from occurring in the analog output circuit during a transient state of power ON/OFF.
- the present invention has the advantage of being able to more conveniently and quickly prevent the occurrence of abnormal output during a power ON/OFF transient state by using low-cost parts.
- 1 shows an output circuit of a bi-directional output inverter.
- FIG. 2 shows an example of an analog output circuit of a bidirectional output inverter in which a means for preventing abnormal output is implemented.
- FIG 3 shows an analog output circuit 100 according to one embodiment of the present invention.
- FIG 4 shows the structure of an inverter 1 according to an embodiment of the present invention.
- FIG. 5 shows an example of various circuits (CS1, CS2, CS3, CS4) connected around the Op-Amp 110.
- FIG. 6 shows a signal flow when power is turned off in FIG. 5 . At this time, the signal flow is indicated by a dotted arrow.
- FIG. 7 shows a voltage diagram measured in a power OFF transient state when the analog output circuit 100 includes only the first switch unit 120 .
- FIG. 8 shows a state in which the second and third switch units 130 and 140 are additionally connected in FIG. 5 .
- FIG. 9 shows a voltage diagram measured in a power-off transient state when the analog output circuit 100 includes all of the first to third switch units 120, 130, and 140.
- inverter 100 analog output circuit
- terms such as “or” and “at least one” may represent one of the words listed together, or a combination of two or more.
- “A or B” and “at least one of A and B” may include only one of A or B, or may include both A and B.
- 'first' and 'second' may be used to describe various elements, but the elements should not be limited by the above terms.
- the above terms should not be interpreted as limiting the order of each component, and may be used for the purpose of distinguishing one component from another.
- a 'first element' may be named a 'second element'
- a 'second element' may also be named a 'first element'.
- FIG. 2 shows an example of an analog output circuit of a bidirectional output inverter in which a means for preventing abnormal output is implemented.
- the analog output circuit of the inverter further including a switch unit (SW) at the C terminal of the op-amp (hereinafter referred to as "op-amp").
- op-amp a switch unit at the C terminal of the op-amp
- the switch unit (SW) switches between the C terminal and the D terminal, and at this time, the D terminal corresponds to the analog output terminal.
- the added switch unit (SW) needs to switch the analog output signal of the bidirectional signal, it can be implemented only by using a fairly expensive switch, which causes a problem of increasing manufacturing cost.
- the switch unit (SW) has to handle a bi-directional signal whose operation range is considerably wide. Accordingly, since the voltage drop due to the contact resistance component of the switch unit (SW) in the ON state occurs considerably, the second prior art has a problem in that calibration of the switch unit (SW) must be performed. do.
- FIG 3 shows an analog output circuit 100 according to one embodiment of the present invention.
- the present invention proposes a technique for simultaneously solving the above-described first and second conventional techniques. That is, the present invention proposes an analog output circuit 100 capable of preventing the occurrence of abnormal output in a transient state of power ON/OFF using low-cost components more conveniently.
- the analog output circuit 100 is a circuit included in the electronic device, and may have a function of generating various analog output signals related to the operating state of the corresponding electronic device and outputting them to an upper controller or an external device through an interface.
- the electronic device to which the analog output circuit 100 is applied may include the inverter 1, and other various home appliances and industrial controllers, but is not limited thereto.
- FIG 4 shows the structure of an inverter 1 according to an embodiment of the present invention.
- the inverter 1 receives power from the AC power source 2 and drives the induction motor 3, as shown in FIG. Voltage and frequency required for control may be varied and provided to the induction motor 3 .
- the inverter 1 can realize its purpose through a PWM technique that generates a voltage by calculating a phase voltage fundamental wave that can be output.
- the inverter 1 includes a converter unit 31, an initial charging resistor 32, an initial charging switch 33, a DC link capacitor 34, a regenerative braking unit 36, and an inverter unit 37. ), a current detection unit 38, a temperature detection unit 39, a main control unit 10, and a pulse width modulation (PWM) control unit 20 and the like.
- PWM pulse width modulation
- the converter unit 31 is a component that rectifies AC power and converts it into DC.
- the converter unit 31 may be generally composed of a diode, or may be composed of an SCR-diode connected to a silicon controlled rectifier (SCR) of the precharge switch 33. .
- SCR silicon controlled rectifier
- the pre-charge resistor 32 and the pre-charge switch 33 are components for preventing an inrush current from being applied to the DC link capacitor 34 when power is applied. That is, when power is applied, the initial charge switch 33 is turned off, the inrush current is suppressed by the initial charge resistor 32, and after the inrush current is suppressed, the initial charge switch 33 is turned on. -on) to separate the initial charging resistor 32 from the circuit.
- the precharge switch 33 may be composed of a magnetic contactor (MC), and may be composed of a silicon controlled rectifier (SCR) connected to a diode of an upper leg of the converter unit 31. may be
- the DC link capacitor 34 may smooth the DC voltage rectified by the converter unit 31, and the inverter unit 37 may convert the DC voltage charged in the DC link capacitor 34 into an AC voltage.
- the inverter unit 37 may be composed of a plurality of control switching elements.
- the control switching element may be a transistor, a metal-oxide-semiconductor field-effect-transistor (MOSFET), an insulated gate bipolar transistor (IGBT), or a gate turn-off thyristor. (gate turn-off thyristor, GTO).
- the inverter unit 37 may output an AC voltage of magnitude and frequency modulated by PWM of variable frequency.
- the regenerative braking unit 36 may consume regenerative energy through the resistor DB R when the increased DC voltage due to regenerative operation or the like is greater than the set voltage.
- the current detector 38 may detect current flowing in each phase of U, V, and W and provide the detected current to the main control unit 10 . Also, the temperature detection unit 39 may detect the temperature of the switching element of the inverter unit 37 and provide the detected temperature to the main control unit 10 .
- the main control unit 10 may collect various types of information such as the DC voltage and phase current of the inverter 1 and command various operations.
- the PWM control unit 20 generates a PWM waveform by using the voltage command (V*) and the frequency command (F*) input from the main control unit 10, and uses this to generate a switching element and regeneration of each phase of the inverter unit 37.
- a gate voltage may be applied to the switch of the braking unit 36 .
- the main control unit 10 can receive a communication command including an operation command and a frequency command from an external upper controller (not shown), and PWM this. It can be provided to the control unit 20.
- main control unit 10 and the PWM control unit 20 are shown and described as being configured separately, they may be configured as one on one board. That is, it is also possible for the main control unit 10 , which performs the functions of the PWM control unit 20 , to directly transmit the gate voltage to the inverter unit 37 .
- the inverter 1 may further include an analog output circuit 100 according to an embodiment of the present invention.
- the analog output circuit 100 may generate various analog output signals related to the operating state of the inverter 1 and transmit them to an upper controller or an external device through an interface.
- the external device may be a programmable logic controller (PLC), a voltage meter, or a current meter, but is not limited thereto.
- PLC programmable logic controller
- the operation of the analog output circuit 100 may be controlled by the main controller 10 .
- the analog output circuit 100 can output an analog output signal having a bi-directional signal through the analog output terminal C, and the analog output terminal C is the above-described analog output signal. interface can be connected.
- the analog output circuit 100 includes an operational amplifier (Op-Amp) 110, a first switch unit 120, and a second switch unit 130. ), a third switch unit 140 and a control unit 150 may be included.
- the controller 150 generates a control signal for a switching operation of each of the switch units 120, 130, and 140 in the analog output circuit 100, and is the above-described main controller 10 or the processor and It may be separately implemented with an MCU including a memory.
- the Op-Amp 110 has a first power terminal supplied with a first power supply (V S + ') of positive (+) voltage and a second power supply terminal supplied with a second power supply (V S - ') of negative (-) voltage. contains a section That is, in the Op-Amp 110, two differential inputs are input to the first and second input terminals A' and B', and these first and second power supplies V S + ', VS - ' The difference between these differential inputs is amplified and output to the output terminal (C').
- the differential inputs input to the first and second input terminals A' and B' may be unidirectional analog signals, and the signals output to the output terminal C' may be bidirectional analog signals.
- an output voltage of a one-way analog signal of 0 V to E V may be output from the first terminal (A), and the line of the first terminal (A) is connected to the first input terminal ( A') can be connected.
- the one-way analog signal input to the first terminal A is a signal related to the operating state of the inverter 1, and may be a voltage output from the MCU of the main control unit 10.
- the circuit of CS1 may be provided between the first terminal A and the first input terminal A'. Accordingly, the unidirectional analog signal applied to the first terminal (A) may be processed (changed) to be suitable for the Op-Amp 110 by CS1 and then input to the first input terminal (A').
- a voltage having a positive value may be output from the second terminal B, and a line of the second terminal B may be connected to the second input terminal B'.
- the signal input to the second terminal (B) is a signal acting as a differential reference signal for the one-way analog signal of the first terminal (A), and may be an offset voltage of a certain magnitude.
- the circuit of CS2 may be provided between the second terminal (B) and the first input terminal (B'). Accordingly, the signal applied to the second terminal (B) may be processed (changed) to be suitable for the Op-Amp 110 by CS2 and then input to the second input terminal (B').
- the Op-Amp 110 amplifies the voltage difference between the signals input to the first and second input terminals A' and B', respectively, in the range of -E 1 V (volt) to E 2 V (volt) (however, E 1 and E 2 are real numbers of 1 or more) bi-directional analog signals can be output to the output terminal (C').
- FIG. 5 shows an example of various circuits (CS1, CS2, CS3, CS4) connected around the Op-Amp 110. However, in FIG. 5 , the first switch unit 120 to the third switch unit 120 , 130 , and 140 are not connected.
- various circuits for assisting the function of the op-amp 110 may be connected to the op-amp 110.
- CS1 and CS2 may include circuits and diode elements connected to resistance elements around the first and second input terminals A' and B' to affect the input signals.
- CS3 is a circuit for feeding back the output of the output terminal C' to the first input terminal A' or the second input terminal B'.
- CS3 may be connected between the output terminal (C') and the first input terminal (A') of the Op-Amp (110) or between the output terminal (C') and the second input terminal (B') of the Op-Amp (110). It may include a resistance element, a diode element, and the like.
- CS4 is a circuit connected to the periphery of the output terminal C'.
- CS4 is connected between the output terminal (C') of the Op-Amp (110) and the analog output terminal (C), and can affect the analog signal output from the output terminal (C') of the Op-Amp (110).
- ESD electrostatic discharge
- one end D is connected to the first and second terminals A and B, and the other end D' is connected to the ground, and one end D and the other end D' are connected to each other. switching between them.
- one end D of the first switch unit 120 may be connected to the first and second input terminals A' and B', respectively.
- the first switch unit 120 is turned OFF, the output voltage and the offset voltage are applied to the first and second input terminals A' and B', respectively.
- the first switch unit 120 is in an ON state, the first and second input terminals A' and B' act to be in a ground state.
- control unit 150 may generate a control signal for controlling switching of the first switch unit 120 and transmit it to the control terminal D′′ of the first switch unit 120 .
- the corresponding control signal may also be transmitted to the control terminals of the second and third switch units 130 and 140 .
- the operation may be more preferable in the following manner. That is, when a specific control signal is generated by the control unit 150, the control signal is transmitted to the first to third switch units 120, 130, and 140 so that the first switch unit 120 is in an OFF state and the first switch unit 120 is in an OFF state.
- the 2 and 3 switch units 130 and 140 are in an ON state, and when the control unit 150 does not generate a corresponding control signal (in particular, when the corresponding control signal is not naturally generated according to power OFF), the corresponding control signal is not transferred to the first to third switch units 120, 130, and 140, so that the first switch unit 120 may be in an ON state and the second and third switch units 130 and 140 may be in an OFF state.
- control unit 150 may generate a control signal only when power of a power supply unit (not shown) such as a switching mode power supply (SMPS) of the inverter 1 is supplied (ie, turned ON), and When the power of the supply unit is cut off (ie, turned OFF), the control signal is not generated naturally.
- a power supply unit such as a switching mode power supply (SMPS) of the inverter 1
- SMPS switching mode power supply
- each differential input can be input as it is to the input terminals A' and B', and accordingly, a bidirectional analog signal amplified by these differential inputs can be output from the output terminal C'.
- the first switch unit 120 is in an ON state as a default state, and the first and second input terminals (A', B') become grounded, and accordingly, no signal is output to the output terminal (C').
- the first switch unit 120 transmits an analog signal only in an ON state, and in this case, the corresponding analog signal has a unidirectional signal ranging from 0 V to E V. Accordingly, the first switch unit 120 may be implemented as a switch for transmitting a one-way analog signal in the range of 0 V to E V.
- FIG. 6 shows a signal flow when power is turned off in FIG. 5 . At this time, the signal flow is indicated by a dotted arrow.
- the first switch unit 120 by the operation of the first switch unit 120, problems of the first prior art can be improved, and abnormal output such as offset output generated during a transient state of power ON/OFF can be prevented.
- the first switch unit 120 can be implemented as a switch for transmitting a one-way analog signal corresponding to a very low-cost part, unlike the switch unit (SW) for transmitting a bidirectional analog signal of the second prior art, manufacturing cost can be reduced. There are benefits to savings.
- FIG. 7 shows a voltage diagram measured in a power OFF transient state when the analog output circuit 100 includes only the first switch unit 120 .
- FIG. 9 shows a voltage diagram measured in a power OFF transient state when the analog output circuit 100 includes all of the first to third switch units 120, 130, and 140.
- the lower diagram is an enlarged portion of the OFF transient state portion (rectangular box portion) of the upper diagram.
- CH3 is the voltage of the first power terminal part of the Op-Amp 110 supplied with power of VS +
- CH4 is the voltage of the Op -Amp 110 supplied with power of VS -
- the voltage of the second power terminal part, CH1 represents the voltage of the output terminal (C') part of the Op-Amp (110), respectively.
- FIG. 8 shows a state in which the second and third switch units 130 and 140 are additionally connected in FIG. 5 . However, in FIG. 8 , the first switch unit 120 and the controller 150 are omitted.
- the present invention may further include second and third switches 130 and 140 .
- the second switch unit 130 is connected to the line of the first power terminal of the Op-Amp 110 to which the first power supply (V S + ') is supplied (ie, the line to which VS + is supplied), Depending on the control signal of the controller 150, whether or not to supply the first power source VS + ' is switched.
- the third switch unit 140 is connected to the line of the second power terminal of the Op-Amp 110 to which the second power supply (V S - ') is supplied (ie, the line to which VS - is supplied), Depending on the control signal of the control unit 150, whether or not to supply the second power source VS - ' is switched.
- the second and third switch units 130 and 140 should be implemented as devices to solve the problem of power supply unbalancing between the VS + power supply and the VS - power supply. Accordingly, the second and third switch units 130 and 140 may be implemented as a photo coupler, which is an element that can reliably cut off the VS + power and the VS - power when the power is turned off.
- the photocoupler is a transmission element that transfers an input electrical signal and an output electrical signal through light.
- This photo coupler is a packaged device of a light emitting element and a light receiving element, and transmits a signal from the light emitting element to the light receiving element using light, so that the light emitting element and the light receiving element can be electrically insulated.
- control signal of the control unit 150 acts as an input to the light emitting elements 131 and 141 of each photo coupler of the second and third switch units 130 and 140 .
- the light receiving element 132 of the photo coupler of the second switch unit 130 is connected to the line of the first power terminal of the Op-Amp 110
- the light receiving element of the photo coupler of the second switch unit 150 ( 142) is connected to the line of the second power terminal of the Op-Amp (110).
- the control unit 150 controls to generate a control signal, and as this control signal is input, the second and third switch units 130 and 140 are turned on, and the first and second switch units 130 and 140 are turned on.
- the second power supplies (V S + ', VS - ') may be respectively input to the first and second power terminals of the Op-Amp 110 . That is, when a control signal is generated in the control unit 150 according to power ON, the corresponding control signal is transmitted to each light emitting element 131, 141 of the photo coupler of the second and third switch units 130 and 140, and each light is emitted. Optical signals are generated from the elements 131 and 141, respectively.
- the light receiving element 132 of the photo coupler of the second switch unit 130 receives the light signal of the light emitting element 131 and connects (turns ON) between the terminal of VS + and the first power terminal,
- the first power (V S + ') may be applied to the first power terminal of the Op-Amp 110 .
- the light receiving element 142 of the photo coupler of the third switch unit 140 receives the optical signal of the light emitting element 141 and connects (turns on) between the terminal of VS - and the second power terminal, Power (V S - ') may be applied to the second power terminal of the Op-Amp (110).
- the control unit 150 when the power of the power supply unit is turned off, the control unit 150 naturally does not generate a control signal, and as the control signal is not transmitted, the second and third switch units 130 and 140 return to the default state. In the OFF state, the input of the first and second power supplies (V S + ' and VS - ' ) to the first and second power terminals of the Op-Amp 110, respectively, may be blocked. That is, as the control signal of the control unit 150 is not generated according to the power off, the optical signal is not generated from each light emitting element 131 or 141 of the photo coupler of the second and third switch units 130 and 140. .
- the light receiving element 132 of the photo coupler of the second switch unit 130 blocks (OFF) between the terminal of VS + and the first power terminal while not receiving the optical signal, and thus the first power supply.
- the input of the first power supply (V S + ') to the terminal is cut off.
- the light receiving element 142 of the photo coupler of the third switch unit 140 blocks (OFF) the connection between the terminal of VS - and the second power terminal while not receiving the optical signal, and accordingly, to the second power terminal.
- the input of the second power supply (V S - ') of is blocked.
- the second and third switch units 130 and 140 are each implemented as photo couplers, the following advantages are obtained. 1) The input/output is completely electrically insulated, and the blocking effect of the first and second power supplies (V S + ', VS - ' ) when the power is turned off is great. 2) Since the signal transmission is unidirectional, there is no effect on the input from the output. 3) The response speed is very fast, and the mounting density can be increased because it is small and light. 4) It has semi-permanent life, high reliability, and is strong against noise because it transmits signals using light.
- the second and third switch units 130 and 140 are implemented as photo couplers, respectively, during the power ON/OFF transient state of the power supply unit (particularly, during the OFF transient state)
- the first and second power sources (V S + ', VS - ') respectively supplied to the first and second power terminals of the Op-Amp 110 are cut off more quickly and accurately by the ON/OFF operation of the corresponding photocoupler. Accordingly, the above-described power supply unbalancing problem can be solved.
- the present invention configured as described above can prevent the occurrence of abnormal output in the analog output circuit during the transient state of power ON/OFF, and in particular, can prevent the occurrence of abnormal output more conveniently and quickly by using low-cost parts. There is an advantage to being
- the present invention relates to an analog output circuit and an inverter having the same, and it is possible to provide an analog output circuit implemented to prevent an abnormal output occurring in a transient state of power ON/OFF and an inverter including the same for industrial use. There is a possibility.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims (9)
- 출력 전압의 선로가 연결된 제1 입력단 및 옵셋 전압의 선로가 연결된 제2 입력단 사이의 차이를 증폭하여 양방향 아날로그 신호를 출력단에서 출력하는 연산 증폭기(operational amplifier, Op-Amp)를 포함하는 전자장치의 아날로그 출력 회로로서,일단이 상기 제1 및 제2 입력단과 각각 연결되고 타단이 접지와 연결되어 상기 일단 및 상기 타단의 사이를 스위칭하는 제1 스위치부; 및상기 제1 스위치부의 스위칭을 제어하는 제어 신호를 생성하는 제어부;를 포함하며,상기 제1 스위치부는 OFF 상태가 되면 상기 출력 전압 및 상기 옵셋 전압이 제1 및 제2 입력단에 각각 인가되도록 작용하고, ON 상태가 되면 상기 제1 및 제2 입력단이 접지 상태가 되도록 작용하는 아날로그 출력 회로.
- 제1항에 있어서,상기 제1 스위치부는 ON 상태 시 단방향 신호 전달용인 아날로그 출력 회로.
- 제1항에 있어서,상기 제어부는 상기 전자장치의 전원 공급부의 전원이 ON될 경우에 상기 제어 신호를 발생시키고 상기 전원 공급부의 전원이 OFF될 경우에 상기 제어 신호를 미 발생시키며,상기 제1 스위치부는 상기 제어 신호의 입력 시에 상기 OFF 상태가 되고, 상기 제어 신호의 미 입력 시에 상기 ON 상태가 되는 아날로그 출력 회로.
- 제1항에 있어서,상기 연산 증폭기는 양(+)전압의 제1 전원을 공급받는 제1 전원단과 음(-)전압의 제2 전원을 공급받는 제2 전원단을 포함하며,상기 제1 전원단의 선로에 연결되어 상기 제어부의 상기 제어 신호에 따라 상기 제1 전원의 공급 여부를 스위칭하는 제2 스위치부; 및상기 제2 전원단의 선로에 연결되어 상기 제어부의 상기 제어 신호에 따라 상기 제2 전원의 공급 여부를 스위칭하는 제3 스위치부;를 더 포함하는 아날로그 출력 회로.
- 제4항에 있어서,상기 제2 및 제3 스위치부는 각각 포토 커플러로 구현된 아날로그 출력 회로.
- 제5항에 있어서,상기 제어 신호는 상기 제2 및 제3 스위치부의 상기 각 포토 커플러의 발광 소자의 입력으로 작용하고,상기 제2 스위치부의 상기 포토 커플러의 수광 소자는 상기 제1 전원단의 선로에 연결되며,상기 제2 스위치부의 상기 포토 커플러의 수광 소자는 상기 제2 전원단의 선로에 연결되는 아날로그 출력 회로.
- 제6항에 있어서,상기 제어부는 상기 전자장치의 전원 공급부의 전원이 ON될 경우에 상기 제어 신호를 발생시키고 상기 전원 공급부의 전원이 OFF될 경우에 상기 제어 신호를 미 발생시키며,상기 제2 및 제3 스위치부는 상기 제어 신호의 입력 시에 상기 제1 및 제2 전원이 상기 연산 증폭기에 각각 입력되도록 작용하고,상기 제2 및 제3 스위치부는 상기 제어 신호의 미 입력 시에 상기 제1 및 제2 전원이 차단되도록 작용하는 아날로그 출력 회로.
- 제1항에 있어서,상기 전자장치는 인버터인 아날로그 출력 회로.
- 양방향 아날로그 신호를 출력하는 아날로그 출력 회로를 포함하는 인버터로서,상기 아날로그 출력 회로는,출력 전압의 선로가 연결된 제1 입력단 및 옵셋 전압의 선로가 연결된 제2 입력단 사이의 차이를 증폭하여 양방향 아날로그 신호를 출력단에서 출력하는 연산 증폭기(operational amplifier, Op-Amp);일단이 상기 제1 및 제2 입력단과 각각 연결되고 타단이 접지와 연결되어 상기 일단 및 상기 타단의 사이를 스위칭하는 제1 스위치부; 및상기 제1 스위치부의 스위칭을 제어하는 제어 신호를 생성하는 제어부;를 포함하며,상기 제1 스위치부는 OFF 상태가 되면 상기 출력 전압 및 상기 옵셋 전압이 제1 및 제2 입력단에 각각 인가되도록 작용하고, ON 상태가 되면 상기 제1 및 제2 입력단이 접지 상태가 되도록 작용하는 인버터.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/292,100 US12567846B2 (en) | 2021-12-13 | 2022-09-07 | Analog output circuit and inverter including same |
| CN202280051511.9A CN117897908A (zh) | 2021-12-13 | 2022-09-07 | 模拟输出电路及具有其的逆变器 |
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| KR10-2021-0177272 | 2021-12-13 | ||
| KR1020210177272A KR102644758B1 (ko) | 2021-12-13 | 2021-12-13 | 아날로그 출력 회로 및 이를 구비한 인버터 |
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| KR (1) | KR102644758B1 (ko) |
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| JP6207871B2 (ja) * | 2013-04-17 | 2017-10-04 | ルネサスエレクトロニクス株式会社 | 半導体装置及びインバータシステム |
| JP2015154304A (ja) * | 2014-02-17 | 2015-08-24 | 株式会社東芝 | 増幅回路、増幅装置、afe回路、および、信号処理システム |
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| JP7764291B2 (ja) * | 2022-03-24 | 2025-11-05 | 株式会社東芝 | 半導体装置及びモータ駆動システム |
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2021
- 2021-12-13 KR KR1020210177272A patent/KR102644758B1/ko active Active
-
2022
- 2022-09-07 WO PCT/KR2022/013469 patent/WO2023113154A1/ko not_active Ceased
- 2022-09-07 US US18/292,100 patent/US12567846B2/en active Active
- 2022-09-07 CN CN202280051511.9A patent/CN117897908A/zh active Pending
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| JP2000252770A (ja) * | 1999-03-02 | 2000-09-14 | Advanced Circuit Technologies:Kk | オフセット電圧の較正方式に特徴を有する直流増幅回路 |
| KR100765591B1 (ko) * | 1999-10-25 | 2007-10-09 | 텍사스 인스트루먼츠 인코포레이티드 | 저전압 광대역 연산 증폭기 |
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Also Published As
| Publication number | Publication date |
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| KR102644758B1 (ko) | 2024-03-06 |
| US20250096757A1 (en) | 2025-03-20 |
| US12567846B2 (en) | 2026-03-03 |
| KR20230088979A (ko) | 2023-06-20 |
| CN117897908A (zh) | 2024-04-16 |
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