KR20050090824A - Electronic device for using different voltage according to working state and method thereof - Google Patents

Abstract

An electronic device using different driving voltages according to an operating state is disclosed. The electronic device is a standby voltage supply unit that detects and outputs a first input voltage from a power supply until a power-on signal is received when the power supply is connected, and detects and outputs a second input voltage from the power supply when a power-on signal is received. When one of the operating voltage supply unit, the first input voltage and the second input voltage is applied, the constant voltage conversion unit for converting and outputting a constant voltage of a predetermined size, and is driven by receiving a constant voltage, and whether to receive the power-on signal And a control unit for selectively operating the standby voltage supply unit and the operation voltage supply unit. Accordingly, internal heat generation can be prevented, and power consumption can be reduced to increase battery usage time.

Description

Electronic device using different driving voltage according to operating state and method thereof {Electronic device for using different voltage according to working state and method

The present invention relates to an electronic device having a power saving function and a method thereof, and more particularly, to an electronic device and a method for reducing power consumption by using a different driving voltage according to the current operating state of the device. It is about.

In general, the electronic device receives power from an external AC power source or an internal battery to perform an operation. Once the power is connected, the control unit (ie, the microprocessor) of the electronic device receives standby power from the power source and maintains the signal standby state. When the power switch is turned on in such a standby state, the controller controls each of the component units to perform a predetermined operation.

In this case, a device for converting a voltage supplied from an external AC power source or a built-in battery into a constant voltage required for maintaining a standby state in a control unit is required. The component unit performing such a voltage conversion operation is generally called a constant voltage regulator.

Constant voltage regulators can be divided into two types: series regulators and switching regulators. The series regulator operates by absorbing the difference between the input voltage and the output voltage in the regulator. Therefore, the heat generated as much as the voltage difference * output current, the efficiency is lowered, the problem that the heat dissipation problem also occurs.

Switching mode regulators, also known as Switching Mode Power Supplies (SMPS), are devices that output a constant voltage in a switching mode. The switching regulator basically includes a switching element and a switching control circuit. The switching control circuit monitors the voltage at the output stage and compares it with the reference voltage, and then controls the switching element according to the change of the output voltage to maintain a voltage having a predetermined magnitude.

On the other hand, there are two types of switching regulators, depending on how the switching control circuit controls the switching elements. One of them is to adjust the on-time and off-time ratio of the switch, which is called a pulse-width modulation (PWM) regulator. The other is to use SCR (silicon controlled rectifier) instead of switching transistor used for PWM. This method is called a PCM (phase controlled modulation) regulator because it changes the phase angle.

1 is a diagram illustrating a configuration of a conventional electronic device 10 that receives power consumption from a battery. According to FIG. 1, the conventional electronic device 10 includes a battery 11, a constant voltage regulator 13, and a controller 15. When a DC voltage of a predetermined size is supplied from the battery 11, the constant voltage regulator 13 converts the applied DC voltage into a constant voltage of a predetermined magnitude required by the control unit 15 and outputs it.

The controller 15 receives the constant voltage from the constant voltage regulator 13 to maintain the standby state. Accordingly, when the user operates the power switch and is turned on, the control unit 15 transmits a control signal to other component units and supplies a driving voltage to the component units requiring the driving voltage. 13).

In the state in which the 8.4V battery 11 is connected, the controller 15 uses the electronic device 10 that requires a driving voltage of 2.5V as an example, and the constant voltage regulator 13 sets the voltage of 8.4V to the constant voltage of 2.5V. To be applied to the control unit 15.

In this case, as described above, the constant voltage regulator can selectively use a linear constant voltage IC or a switching SMPS. In the case of using the constant voltage IC, the remaining voltage excluding the voltage required by the controller is consumed as heat from the voltage supplied from the battery. Therefore, in the constant voltage IC, a voltage of 5.9 V is consumed as heat. As a result, the temperature inside the electronic device 10 rises, affecting other internal components. That is, if the electronic device 10 is a video display device for reproducing image data recorded on a VCR tape, the performance of the VCR drum is degraded due to an increase in internal temperature, and as a result, a cracking phenomenon may occur on the screen.

On the other hand, when the switching type SMPS is used as the constant voltage regulator, the efficiency can be increased to prevent internal heat generation. However, in this case, the consumption current used to apply the standby voltage to the controller 15 inside the SMPS is large in the standby state (that is, when the battery is mounted and the power of the electronic device 10 itself is OFF). There is a problem that you lose. Therefore, there is a problem that unnecessary power consumption is generated and the battery is quickly consumed.

This problem is contrary to the recent trend of reducing power consumption in the non-use of electronic products in each country, the need for an appropriate solution.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electronic device and a method for reducing unnecessary power consumption by using different driving voltages according to operating conditions.

An electronic device according to the present invention for achieving the above object, the standby voltage supply unit for detecting and outputting a first input voltage from the power supply in a signal standby state that is a state before the power supply is connected to the power-on signal, The operating voltage supply unit detects and outputs a second input voltage from the power when the power-on signal is received, and converts to a constant voltage having a predetermined size when one of the first input voltage and the second input voltage is applied. A constant voltage converter and a controller which is driven by receiving the constant voltage and selectively operates the standby voltage supply unit and the operation voltage supply unit according to whether the power-on signal is received.

In this case, the standby voltage supply unit may be configured to convert the input voltage supplied from the power supply into the voltage having a predetermined magnitude in the standby state, and to be turned on when the voltage is applied from the constant voltage IC. It is preferable to include a first switch for transmitting to the constant voltage conversion unit. In this case, the constant voltage IC refers to an IC that regulates the voltage in a linear manner.

On the other hand, when the power-on signal is received, the operating voltage supply unit, including the SMPS to control the input voltage supplied from the power source by the PWM switching method to convert to the second input voltage and then applied to the constant voltage conversion unit It is preferable.

More preferably, the electronic device may further include a circuit isolation unit for preventing current from flowing between the standby voltage supply unit and the operation voltage supply unit.

Meanwhile, the driving voltage supply method according to the present invention may be applied to an electronic device including a control unit which maintains a standby state until a power-on signal is input when a power source is connected. The driving voltage supply method may include: (a) converting an input voltage applied from the power source into a constant voltage having a predetermined magnitude and outputting the same to the controller; (b) an input voltage applied from the power source when the power-on signal is input; Controlling the switching method to a second input voltage having a predetermined magnitude, and (c) converting the second input voltage to the constant voltage and outputting the converted voltage to the controller.

In this case, in the step (b), it is preferable to use an SMPS for converting the input voltage into a second input voltage having a predetermined magnitude by switching the PWM method.

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

2 is a block diagram showing the configuration of an electronic device according to an embodiment of the present invention. According to FIG. 2, the electronic device includes a power supply 110, a standby voltage supply unit 120, an operation voltage supply unit 130, a circuit isolation unit 140, a constant voltage conversion unit 150, and a controller 160.

The power source 110 may be an external AC power source or a battery mounted therein. When the power supply 110 is connected, the standby voltage supply unit 120 operates to supply a driving voltage to the constant voltage conversion unit 150. The constant voltage converting unit 150 includes a constant voltage IC to convert the voltage applied from the standby voltage supply unit 120 into a voltage having a predetermined magnitude required by the controller 160 and output the converted voltage. Accordingly, the controller 160 maintains the standby state until the user operates the power switch to turn on the power.

Meanwhile, when it is determined that the power-on is turned on, the controller 160 transmits a control signal to the standby voltage supply unit 120 to stop the operation, and transmits a control signal to the operation voltage supply unit 130 to supply the driving voltage. . In this case, the operation voltage supply unit 130 may include an SMPS to increase the voltage supply efficiency. The constant voltage converting unit 150 converts the driving voltage applied from the operating voltage supplying unit 130 into a voltage having a predetermined magnitude required by the controller 160 and outputs the converted voltage. Accordingly, the controller 160 controls other component units to enable the electronic device to operate normally.

The circuit isolation unit 140 isolates the standby voltage supply unit 120 and the operation voltage supply unit 130 from each other so as not to affect each other.

As a result, it is possible to reduce the current consumption in the standby state by supplying the standby voltage using the constant voltage IC in the standby state. In addition, when the power-on to the operating state to increase the energy efficiency by supplying the operating voltage using the SMPS to increase the battery life time, it is possible to prevent the heat generation phenomenon.

3 is a circuit diagram illustrating the configuration of the electronic device of FIG. 2 in more detail. According to FIG. 3, the electronic device 100 uses a battery as a power source 110. Also, the standby voltage supply unit 120 includes a first constant voltage IC 121 and a first switch 123, and the operation voltage supply unit 130 includes an SMPS 131 and a second switch 133. In addition, the circuit isolation unit 140 is implemented with two diodes 141 and 143.

Hereinafter, in FIG. 3, the DC 8.4 V battery 110 is used, the second constant voltage IC 150 uses a unit for supplying a voltage of 2.5 V, and the first constant voltage IC 121 and the SMPS 131 are used. The case where a unit which outputs a constant voltage of 3V each is used is demonstrated as an example.

Referring to the operation of the circuit diagram shown in FIG. 3, first, when the battery 110 is connected, an input voltage of 8.4 V is applied to one side of each of the first constant voltage IC 121, the first switch 123, and the SMPS 131. Is approved. The first constant voltage IC 121 converts the input voltage into a 3V voltage and transfers the input voltage to the first switch 123. The first switch 123 performs a switching operation according to the voltage input from the first constant voltage IC 121 to output an input voltage of 8.4V.

When using a bipolar junction transistor (BJT) as the first switch, the output terminal of the first constant voltage IC 121 may be connected to the base terminal, and the power supply 110 may be connected to the collector terminal. At this time, the emitter terminal is connected to the circuit isolation unit 140. Accordingly, when the output voltage 3V of the first constant voltage IC 121 is applied to the base terminal, the transistor is turned on, and the input voltage 8.4V is applied to the circuit isolation unit 140.

The circuit isolation unit 140 connects the standby voltage supply unit 120, the operation voltage supply unit 130, and the second constant voltage IC using the first diode 141 and the second diode 143. Therefore, 8.4V output from the standby voltage supply unit 120 is applied to the second constant voltage IC 150 without affecting the operation voltage supply unit 130.

On the other hand, the second constant voltage IC 150 converts the input voltage 8.4V to 2.5V and applies it to the controller 160. The controller 160 can maintain the standby state by the driving voltage of 2.5V. Under the standby state, the controller 160 waits for the power-on signal of the user. Since the other unit units other than the control unit 160 do not operate in the standby state, even if heat is generated in the second constant voltage IC 150, there is no problem such as affecting the operation of the electronic device itself.

When the user operates the power switch to turn on the power, the controller 160 recognizes this and transmits a predetermined control signal to the first constant voltage IC 121 to stop the 3V voltage output operation. Thus, the first switch 123 is blocked.

On the other hand, the controller 160 transmits a control signal separately to the SMPS 131 to output a voltage of 3V.

In this case, the first constant voltage IC 121 and the SMPS 131 may be controlled by operating when a high pulse is applied and stopping the operation when a low pulse is applied. Accordingly, when the high pulse signal is applied from the control unit 160, the SMPS 131 converts the voltage applied from the power supply 110 into 3V and applies it to the second switch terminal 133. In this case, a PWM IC that controls the output voltage according to the PWM method can be used. The PWM IC refers to a device for controlling the output voltage by controlling the on / off ratio (time ratio: duty) of the regulator driver (output transistor) in a control method by pulse width modulation as described above.

When the second switch 133 is turned on and the output voltage of the SMPS 131 is applied to the circuit isolation unit 140 as it is, the circuit isolation unit 140 transfers it to the input terminal of the second constant voltage IC 150. Accordingly, the second constant voltage IC 150 converts the voltage into a 2.5V voltage and outputs the converted voltage. At this time, when the SMPS 131 having a reference voltage of about 3V is used, the difference between the voltage input to the second constant voltage IC 150 and the output voltage is about 0.5V. Such a voltage difference may be regarded as insignificant so as not to affect the action of other constituent units even though heat is emitted from the second constant voltage IC 150.

On the other hand, when the user inputs the power-off signal again, the controller 160 transmits a low pulse signal to the SMPS 131 to stop the 3V voltage conversion operation, and sends a high pulse signal to the first constant voltage IC 121. Transmit to perform 3V voltage conversion operation. Accordingly, a voltage of 8.4 V is again input to the second constant voltage IC 150 and the standby state is maintained.

As a result, the voltage is converted using the SMPS 131 in the operating state, and the energy efficiency is maximized by converting the voltage using the first constant voltage IC 121 in the standby state.

4 is a flowchart illustrating a driving voltage supply method according to the present invention. According to FIG. 4, since the standby state must be maintained to recognize the power-on signal even before the power-on signal is input once the power is supplied, the standby voltage is supplied to the controller 160 (S410). . According to the circuit shown in FIG. 3, the input voltage can be extracted using the first constant voltage IC 121 and the first switch 123.

When it is determined that the power-on signal is input in the standby state (S420), the controller 160 stops the operation of the first constant voltage IC 121 (S430) and operates the SMPS 131 (S440). The SMPS 131 converts the magnitude of the input voltage into a voltage having a predetermined magnitude and applies it to the second constant voltage IC 150. Accordingly, since the voltage consumed by the second constant voltage IC 150 decreases when the power is turned on and operates, the heat generation phenomenon is reduced. Therefore, the operation of other structural units is not greatly influenced.

In particular, since the driving voltage is supplied using the SMPS 131 having high consumption efficiency in the operating state, power consumption can be reduced, which can be advantageously used in portable electronic devices using batteries.

FIG. 5 is a block diagram showing the configuration of a composite photographing apparatus 200 having both functions of a digital camcorder and a digital camera according to another embodiment of the present invention. According to FIG. 5, the composite photographing apparatus includes a DVC module (Digital Video Camera module: 210), a DSC module (Digital Still Camera module: 220), a controller 230, an image signal processor 240, an input unit 250, a power source. 260, standby voltage supply unit 270, operating voltage supply unit 275, constant voltage conversion unit 280, system bus 290, display unit 291, VCR unit (Video Cassette Recorder unit 293), and memory Card (Memory Card: 295).

The DVC module 210 photoelectrically converts an optical signal incident through a lens into an electrical signal and performs predetermined signal processing on the converted signal. The DVC module 210 can capture both a moving image and a still image, but is mainly used to capture a moving image since the image quality of the still image is poor. The DVC module 210 includes a DVC lens unit 211, a DVC lens driving unit 219, a DVC CCD (Charge Coupled Device) 213, a DVC CDS / AGC / ADC (Correlated Double Sampler / Auto Gain Controller / Analaog-to-Digital). converter: 215, and a DVC signal processor 217.

The DVC lens driver 219 drives the DVC lens unit 211 under the control of the controller 230 to zoom-in / zoom-out, automatically adjust focus, and adjust the opening and closing amount of the aperture. And so on. The DVC CCD 213 converts an optical image incident through the DVC lens unit 211 into an electrical signal and outputs the electrical signal. The DVC CDS / AGC / ADC 215 removes noise from the electrical signal output from the DVC CCD 213 using the CDS, and adjusts the gain so that the level of the signal is kept constant using the AGC. Convert it to a digital signal using an ADC. The DVC signal processor 217 separates the digital signal output from the DVC CDS / AGC / ADC 215 into a luminance (Y) signal and a chrominance (C) signal, gain adjustment, contour correction, and AWB (Auto White). Balance).

On the other hand, the DSC module 220 performs a photoelectric conversion of the optical signal incident through the lens into an electrical signal, and performs a predetermined signal processing process on the converted signal to take a still image. The DSC module 220 includes a DSC lens unit 222, a DSC lens driver 221, a DSC CCD 223, a DSC CDS / AGC / ADC 224, a DSC signal processor 225, a DSC CODEC (COrder / DECoder: 226 and the DSC control unit 227.

The DSC controller 227 communicates with the controller 230 to control operations of the DSC lens driver 221, the DSC signal processor 225, and the DSC CODEC 226. Similar to the internal configuration unit of the DVC module 210, the DSC lens driver 221 drives the DSC lens unit 222 under the control of the DSC control unit 227, and the DSC CCD 223 drives the DSC lens unit 222. The optical image incident through the light signal is converted into an electrical signal and output. Further, the DSC CDS / AGC / ADC 224 removes noise from the signal output from the DSC CCD 223, adjusts the gain so that the level of the signal is kept constant, and then converts the digital signal into a digital signal. The DSC signal processor 225 separates the signal output from the DSC module 220 into the luminance (Y) signal and the chrominance (C) signal, and performs gain adjustment, contour correction, AWB, and the like. On the other hand, the DSC CODEC 226 compresses the output signal of the DSC signal processor 225 into a signal of a predetermined format and then applies the signal to the video signal processor 240 using the system bus 280.

On the other hand, the image signal processor 240 serves to record the image taken from one of the DVC module 210 and the DSC module 220 on the recording medium, or to reproduce the image recorded on the recording medium. In this case, the captured image is recorded in the VCR unit 293 or the memory card 295 under the control of the controller 230. Also, the reproduced image is output on the screen through the display unit 291.

The controller 230 transmits a control signal to each component unit through the system bus 290 to perform mode operations such as DVC photographing, DSC photographing, DVC reproduction, and DSC reproduction. Such a composite photographing apparatus has a large number of internal structural units, and the mode conversion of the controller 230 is frequently performed, thereby increasing battery consumption in comparison with other portable electronic devices. In addition, problems such as deterioration of image quality due to internal heat may be seriously felt.

Therefore, when the power supply 260 is connected but not yet powered on, the controller 230 receives the standby voltage using the standby voltage supply unit 270. At this time, the standby voltage supply unit 270 may include a constant voltage IC to reduce the current consumption in the standby state.

Meanwhile, when the user inputs a power-on signal through the input unit 250, the controller 230 recognizes this and transmits a low pulse signal to the standby voltage supply unit 270. Accordingly, the standby voltage supply unit 270 stops the standby voltage supply operation. At the same time, the controller 230 transmits a high pulse signal to the operation voltage supply unit 275. Accordingly, the SMPS in the operating voltage supply unit 275 operates to supply the driving voltage to the controller 230 and other internal components. In this case, the SMPS may use a PWM IC that is controlled by PWM. Accordingly, since internal heat generation can be prevented, the problem of deterioration of image quality can be solved.

The voltage supplied from one of the standby voltage supply unit 270 and the operating voltage supply unit 275 is supplied to the constant voltage conversion unit 280. The constant voltage converting unit 280 converts the constant voltage of the magnitude required by the control unit 230 and outputs the same, thereby allowing the control unit 230 to maintain the standby state or the operating state normally. On the other hand, preferably, the stability of the circuit can be improved by adding a circuit isolation unit (not shown) that can block the inflow of current between the standby voltage supply unit 270 and the operating voltage supply unit 275.

As described above, according to the present invention, energy efficiency can be maximized by selectively using a linear constant voltage regulator and a switching constant voltage regulator according to the state of the electronic device. In particular, when the electronic device is in the operating state, the switching type constant voltage regulator is used to prevent internal heating, thereby preventing the malfunction of the device.In the standby state, the linear type constant voltage regulator can be used to minimize the current consumption. do. Accordingly, the battery use time can be increased.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a block diagram showing the configuration of an electronic apparatus according to the prior art;

2 is a block diagram showing a configuration of an electronic apparatus according to an embodiment of the present invention;

3 is a circuit diagram showing in detail the configuration of the electronic device shown in FIG.

4 is a flowchart for explaining a driving voltage application method according to the present invention;

5 is a block diagram illustrating a configuration of a composite photographing apparatus capable of selectively capturing a moving image and a still image according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawing

110: power supply 120: standby voltage supply unit

130: operating voltage supply unit 140: circuit isolation unit

150: constant voltage supply unit 160: control unit

Claims (6)

An electronic device that maintains a signal standby state when a power supply is connected until a power-on signal is received. A standby voltage supply unit for detecting and outputting a first input voltage from the power supply in the signal standby state; An operating voltage supply unit for detecting and outputting a second input voltage from the power supply when a power-on signal is received; A constant voltage converting unit converting and outputting a constant voltage having a predetermined magnitude when one of the first input voltage and the second input voltage is applied; And And a controller which is driven by receiving the constant voltage and selectively operates the standby voltage supply unit and the operation voltage supply unit according to whether the power-on signal is received. The method of claim 1, The standby voltage supply unit, A constant voltage IC converting an input voltage supplied from the power source into a voltage having a predetermined magnitude in the standby state; And And a first switch which is turned on when the voltage is applied from the constant voltage IC and transfers the input voltage to the constant voltage converting unit. The method of claim 2, The operation voltage supply unit, And receiving the power-on signal, and converting the input voltage supplied from the power supply into the second input voltage by controlling the input voltage supplied by the PWM switching method and applying the same to the constant voltage converting unit. The method of claim 3, And a circuit isolation unit for preventing current from flowing between the standby voltage supply unit and the operation voltage supply unit. In the driving voltage supply method of an electronic device comprising a control unit for maintaining a standby state until a power-on signal is input when the power is connected, (a) converting an input voltage applied from the power source into a constant voltage having a predetermined magnitude and outputting the constant voltage to the controller; (b) converting the input voltage applied from the power supply into a second input voltage having a predetermined magnitude when the power-on signal is input by switching; And (c) converting the second input voltage into the constant voltage and outputting the converted voltage to the control unit. The method of claim 5, In step (b), And a SMPS for switching the input voltage into a PWM method and converting the input voltage into a second input voltage having a predetermined size.