JP2008134778A - Power supply starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is always needed to delay a fixed time period t (e.g., 0.3 second) until a power supply circuit actually starts after a power switch is turned on to cope with chattering in starting power supply. <P>SOLUTION: Mounting a battery 1 supplies voltage to a power supply circuit 6, and a voltage detection circuit 2 generates a mounting signal of the battery 1. The circuit 2 detects a voltage, and a switch 4 inputs a power-on signal to power on a portable electronic device and a power-off signal to power off the device to a control circuit 3. By receiving the power-off signal, a delay circuit 5 stops a P. ON. Hi_3 signal to control the power supply circuit 6 for a prescribed time period, a storage circuit 7 stores the power-on signal or the mounting signal, and the delay circuit 5 inputs the P. ON. Hi_3 signal to the power supply circuit 6 after making a delay for a prescribed time period to apply the voltage from the battery 1 to the power supply circuit 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a starter for a power supply circuit, and is particularly suitable for a starter for a battery circuit applied to a power source of a portable electronic device or the like.

  In recent years, regarding power supply circuits in battery-powered portable devices, in addition to the conventional basic performance of supplying power with appropriate voltage and current capacity corresponding to each circuit and IC, power saving and startup time It is required that the system can be shortened and can be started at high speed.

  Normally, even when the entire device is controlled using a microcomputer, a dedicated IC provided separately from the microcomputer may be used for power start-up control and power-off control (hereinafter referred to as OFF). Many. The reason is that the leakage current consumed from the main battery can be reduced if only the dedicated IC is operating when the main unit power is OFF, rather than the microcomputer is always operating when the main unit power is OFF. .

In addition, if a dedicated IC provided separately from the microcomputer is used, the power of the microcomputer with relatively large power consumption can be supplied from the switching power supply when the main power supply is energized (hereinafter referred to as ON). As a result, the power consumed by the entire device can be reduced.

Conventionally, the power supply starting device described in Patent Document 1 is known. An outline of the power activation device is shown in FIG. In FIG. 4, 41 is a main battery for portable equipment. A voltage detection circuit 42 sends a main battery mounting signal, which is one of the power activation factors, to the control circuit 43 when the main battery 41 is mounted. Upon receiving the main battery mounting signal, the control circuit 43 outputs “P.ON.Hi_1”, which is a start control signal for starting the power supply circuit 46. “P.ON.Hi_1” is delayed by the delay circuit 45 to become “P.ON.Hi_2”. This “P.ON.Hi_2” actually activates the power supply circuit 46. A power switch 44 transmits to the control circuit 43 an energization signal that is one of the power activation factors for the control circuit 43 and a disconnection signal that cuts off the energization.

  The operation of the conventional power activation device configured as described above will be described. First, when the main battery 41 is attached to a portable device, power is supplied to the power circuit 46 and the control circuit 43, but the power as a device is not turned on by itself. The control circuit 43 that exclusively controls the activation of the power supply and the power supply OFF in place of the microcomputer sends a control signal for turning on the power supply to the power supply circuit 46 to turn on the power of the device. That is, the control circuit 43 manages the activation of the power supply of the entire device.

  For example, when the main battery 41 is a secondary battery, if the main battery 41 is sufficiently charged and has a predetermined voltage, the voltage detection circuit 42 detects the voltage and causes the control circuit 43 to One main battery mounting signal is sent. On the other hand, when the main battery 41 is insufficiently charged, the power of the main battery 41 is supplied to the power supply circuit 46 and the control circuit 43, but the voltage does not reach a sufficient voltage for the power supply circuit 46 to operate. The voltage detection circuit 42 detects and determines that the voltage is insufficient, and does not send a main battery mounting signal to the control circuit 43. As a result, the device will not turn on. A general voltage detection type reset IC can be applied to the voltage detection circuit 42, and the function can be realized by sending the reset output signal to the control circuit 43 as a main battery mounting signal.

  When a sufficiently charged main battery 41 is attached and the voltage detection circuit 42 sends a main battery attachment signal to the control circuit 43, the control circuit 43 is an activation control signal “P. ON.Hi_1 "is output. “P.ON.Hi — 1” is not activated as it is, but is delayed by the delay circuit 45. The delay circuit 45 delays the signal change timing from Low indicating the power OFF state to Hi indicating the power ON state, and creates “P.ON.Hi_2”. The signal change from Low representing the power OFF state of “P.ON.Hi_2” to Hi representing the power ON state directly activates the power supply circuit 46.

  The reason why the delay circuit 45 is necessary will be described below with reference to the timing chart of FIG. The timing diagram of the battery input (hereinafter referred to as the first) in FIG. 6 represents the voltage applied to the device when the main battery 41 is mounted on the device. P.P. ON. The timing chart of Hi_1 (hereinafter referred to as the second) represents the output timing of “P.ON.Hi_1”. Similarly, P.I. ON. The timing diagram of Hi_2 (hereinafter referred to as the third) represents the output timing of “P.ON.Hi_2”.

  Normally, when the main battery 41 is mounted on a device, as shown by points A to G in the first timing diagram of FIG. 5, when the battery terminal is connected to the terminal of the main body, “chattering at power on” The phenomenon called occurs. “Chattering at power-on” is a phenomenon in which when terminals of a battery are connected to terminals of the main body, the terminals are connected or separated at a short period, but at the very moment when the terminals are connected. This phenomenon is a phenomenon that always occurs when mechanical electrical contacts are connected, even if the period is long or short. Hereinafter, “chattering at power-on” is also simply referred to as chattering.

  As shown in the above description, when the power source of the main battery 41 is connected to the device, the voltage detection circuit 42 sends a main battery mounting signal to the control circuit 43, and the control circuit 43 displays “P” at point A in FIG. .. ON.Hi_1 "is output, but the timing waveform of" P.ON.Hi_1 "during the chattering period when the power is turned on is the first as shown in the second timing diagram of FIG. This is almost the same as the timing waveform of the battery input applied to the device. Of course, the actual change in the output of “P.ON.Hi_1” in the second timing waveform actually has a slight delay in the response speed of each circuit, but the battery input to the device “P.ON.Hi_1” is output at almost the same timing as the voltage timing.

  If ON / OFF due to chattering is given to the power supply circuit 46 at the timing of “P.ON.Hi_1” as it is, it is a long cycle because it is conceptually shown in the figure, but in fact it is much more Since the power supply is repeatedly turned on and off in a short cycle, the power supply circuit 46 malfunctions. That is, the voltage charged in the previous ON period remains in the decoupling capacitor or the like used in the output circuit portion of the power supply circuit 46, and the power supply circuit 46 malfunctions.

  When the power supply circuit 46 causes such a malfunction, the power supply circuit 46 may transiently output a voltage higher than normal. This high voltage sometimes reaches a high voltage that exceeds the absolute maximum ratings of the ICs and electrical components constituting each circuit. Therefore, there are cases where ICs and electrical components to which such a high voltage is applied are destroyed in some cases due to a voltage exceeding the absolute maximum rating.

  Therefore, in the conventional power start-up device, the power supply circuit 46 is not directly turned ON / OFF by “P.ON.Hi_1”, and the delay circuit 45 is inserted after that and remains in the decoupling capacitor used for the output circuit portion. The power supply circuit 46 is turned ON / OFF by using “P.ON.Hi_2” obtained by delaying the change from “Low” to “Hi” of “P.ON.Hi_1” after a sufficient time for the residual voltage to discharge. Thus, as shown in the third waveform in FIG. 5, a signal obtained by delaying the timing of the change from “Low” to “Hi” of the power activation of “P.ON.Hi_1” by a predetermined period t is “P.ON.Hi_2”. It is.

  That is, the delay circuit 45 delays the power activation timing by the change of “P.ON.Hi_2” from the Low level to the Hi level by the period t, and the timing of the change from the Hi level to the Low level of the power OFF control is Configure to avoid delays. With this configuration, a time longer than the period t can be ensured during the power-off period.

  This is a necessary configuration in another sense. In other words, the control timing in the direction of turning off the power includes highly urgent control such as forced reset of the power or turning off the emergency power for protection against a short circuit of the output circuit. For this reason, it is necessary to immediately execute the control in the power OFF direction. The actual circuit configuration of this control can be easily realized by, for example, a method of connecting the front and rear of the delay circuit 45 with a diode.

5A and 5B, the first waveform and the third waveform shown in FIG. 5 indicate that “P.ON.Hi_2” is not affected by any short cycle power-on chattering when the battery 1 is input. Can be controlled so that the next power supply is turned on after a power-off period of at least the period t is secured.
JP 2006-18574 A

  However, in the conventional configuration described above, the power source activation factor (generic name for the supply signal and the energization signal) is established, and until the power circuit is actually activated, the points A to B and D to E in FIG. As described above, a delay of the period t always occurs. The same is true when the power switch is turned on, and the power supply circuit actually starts after the user turns on the power switch, such as points G to H and J to K in the figure. Until this occurs, a delay of period t occurs.

  As shown in the timing diagram of FIG. 5, when the user of the device turns on the power switch, the control circuit 43 detects it and immediately issues “P.ON.Hi_1”. Since the circuit 45 is turned on, “P.ON.Hi_2” that actually turns on the power supply circuit 46 changes from the Low level to the Hi level after the period t, the power supply is not turned on immediately, and the delay of the period t is delayed. appear.

  In recent devices, the scale of the circuit connected to the power supply circuit has increased, and the capacity of the decoupling capacitor used in the output circuit portion has also increased. As a result, the time required for discharging the residual voltage remaining in the decoupling capacitor or the like becomes longer, and the predetermined period t required for chattering countermeasures when the power is turned on is equivalently longer. For example, in recent devices, devices that have a predetermined period t of about 0.3 seconds have been commercialized.

  On the other hand, in the pursuit of usability, there has been a strong demand for high-speed startup in recent years. Among portable devices, especially digital still cameras and movies that are used to record video and audio, the power is usually turned off and standby is performed to keep the battery running down while aiming at the moment. When an event is likely to occur, there is a need for a response that allows the device to be instantly activated and used for shooting or recording.

  In such a situation where the demand for quick activation is becoming stronger, it is said that a predetermined period t (for example, 0.3 seconds) is always required after the power switch is turned on until the power circuit is actually activated. Had problems.

  The present invention solves the above-mentioned conventional problems, and it corresponds to a delay period t that is inevitably necessary for chattering measures at the time of power-on when a battery is mounted, while a period t at the time of power activation when the device is turned on with a power switch. It is an object of the present invention to provide a power activation device that can immediately activate a power source without requiring a power source.

  In order to achieve this object, a power activation device of the present invention includes a power supply unit that supplies power to an electronic device, a power detection unit that detects supply of power from the power supply unit and generates a supply signal, and Switching means for generating an energization signal for energizing the electronic device and a disconnection signal for disconnecting the energization, and energizing the electronic device with electric power from the power supply unit according to the energization signal, the disconnection signal, and the supply signal Power supply means, delay means for delaying a predetermined period after at least one of the stop of the supply signal by the power supply means or generation of the disconnection signal by the switching means, and the delay means start delaying At least one of a start point and the supply signal generated from the power detection unit or the energization signal generated from the switching unit within the predetermined period from the start point Storage means for storing, the supply signal or the energizing signal said memory means has stored, and has a configuration and a control means for controlling current applied to said power supply means after the predetermined period from the start point.

  The present invention copes with the period t required for chattering countermeasures when the power is turned on when the battery is mounted, but does not require the period t when the power is turned on when the device is turned on with the power switch, and immediately turns on the power. A power activation device that can be activated can be provided.

  The power activation device of the present invention includes a power supply unit that supplies power to an electronic device, a power detection unit that detects supply of power from the power supply unit and generates a supply signal, and an energization signal that energizes the electronic device And a switching means for generating a disconnection signal for disconnecting the energization, a power supply means for energizing the electronic device with power from the power supply means in response to the energization signal, the disconnection signal, and the supply signal, and the power A delay unit that delays a predetermined period after at least one of the stop of the supply signal by the supply unit or the generation of the disconnection signal by the switching unit; a start point at which the delay unit starts delay; and the start point Storage means for storing at least one of the supply signal generated from the power detection means and the energization signal generated from the switching means within the predetermined period from The supply signal or the energizing signal serial storage means for storing, and a control means for controlling energization to said power supply means after the predetermined period from the start point. With this configuration, when the supply signal is stopped from the power detection unit or the switching unit generates a disconnection signal, the control unit issues a delay command to the delay unit for a predetermined period, thereby supplying power to the power supply unit for the predetermined period. Therefore, it is possible to suppress problems caused by chattering that always occurs when the power to the electronic device is turned on or the electronic device internal switch is turned on / off. In addition, after the predetermined time has elapsed, power can be supplied from the power supply means to the power supply means promptly by a supply signal or energization signal, and waiting for prevention of troubles due to chattering when the power is turned on or the electronic device internal switch is turned on. Time can be eliminated.

  When the storage means in the power activation device receives either the disconnection signal or the stop of the supply signal, the control means may perform control to immediately stop energization of the power supply means. With this configuration, it is possible to prioritize and stop the energization of the power supply means, that is, to immediately stop energization of the power supply means such as the disconnection signal or supply signal stop, and to incorporate the delay time t into the energization stop period. The delay of energization due to t, that is, the waiting time can be suppressed.

  When the storage means in the power activation device receives the disconnection signal and the supply signal at the same time, the control means controls the power supply means to give priority to the disconnection signal, and the supply signal is stored in the storage means. It is also possible to adopt a configuration in which control for storing the power supply signal is performed and control for transmitting a supply signal to the power supply means immediately after the predetermined period has elapsed. With this configuration, power-off factors such as disconnection signals or supply signal foundations can always be given the highest priority. Therefore, during power-off control, for example, control such as highly urgent power reset or protection against output circuit short-circuiting is ensured. Can be executed.

  The power source for measuring the predetermined time in the delay means of the power activation device can be a backup power source provided in the electronic device. With this configuration, the delay time can be measured continuously even when the main battery is completely disconnected and the power supply is stopped. For example, when power is lost or the battery is accidentally removed, power is supplied. When the power supply resumes after suddenly stopping, the operation of the device can be resumed without delay.

  Preferably, the power source for measuring the predetermined time in the delay means of the power activation device includes a power storage means having a capacity capable of operating the delay means over at least the entire predetermined period, and a backflow prevention diode. With this configuration, even when the power supply to the power supply means is stopped due to, for example, the power supply being inadvertently disconnected from the mounting portion, no backup battery is required, so there is no hindrance to delay time measurement, and electronic equipment The cost can be reduced.

  It is preferable to apply a reference signal of a clock circuit as a reference for measuring the predetermined period. With this configuration, a constant reference signal can always be ensured, and the delay time can be set to a predetermined time.

  In addition, a power supply circuit that supplies power to an electronic device that operates by energization, a power detection circuit that generates a supply signal supplied with power from the power supply circuit, an energization signal that energizes the electronic device, and the energization A power supply starter comprising: a switching circuit that generates a disconnection signal for disconnecting power; and a power supply circuit that conducts power from the power supply circuit to the electronic device in response to the energization signal, the disconnection signal, and the supply signal. A delay circuit that delays a predetermined period after at least one of the stop of the supply signal by the power supply circuit or the generation of the disconnect signal by the switching circuit, and a starting point at which the delay circuit starts delaying , At least one of the supply signal generated from the power detection circuit and the energization signal generated from the switching circuit within the predetermined period from the start point An integrated circuit for power activation, in which a storage circuit for storing the power supply and a control circuit for controlling energization of the power supply means after the predetermined period from the start point for the supply signal or the energization signal stored in the storage circuit Is preferably applied to electronic equipment. With this configuration, the power activation circuit can be made into one chip, so that downsizing and power saving of the electronic device can be achieved.

  Hereinafter, the best embodiment of the power start-up device of the present invention will be described in detail with reference to FIGS. FIG. 1 is a configuration diagram of an embodiment of a power supply activation apparatus according to the present invention. 1 is a battery (power supply means) for supplying power to an electronic device, and 2 is a voltage when a battery 1 is mounted on a battery mounting section (not shown). Is a voltage detection circuit (power detection means) for detecting a supply signal, 3 is a control circuit (control means), 4 is a power switch (switching means), 5 is a delay circuit (delay means), 6 is a power supply circuit, and Reference numeral 7 denotes a memory circuit. The control circuit 3 is connected to the voltage detection circuit 2, the power switch 4, the delay circuit 5, and the storage circuit 7, and transmits a control signal to the power circuit 6.

  Next, the circuit block configuration and operation of FIG. 1 will be described. When a battery 1 for driving a portable electronic device (not shown) such as a movie or a digital still camera is attached to an attachment portion (not shown), a voltage is applied to the power supply circuit 6 and the voltage detection circuit 2 detects the attachment of the battery 1. Then, a mounting signal (supply signal) is transmitted to the control unit 3. At this time, the attachment signal is not only indicative of attachment of the battery 1, but also generates a signal indicating whether or not the battery 1 has a voltage sufficient to drive the portable electronic device via the power supply circuit 6. That is, when the battery 1 is a primary battery, the voltage detection circuit 2 does not send out a mounting signal when it detects a lack of voltage or capacity, and when the battery 1 is a secondary battery, it detects a lack of charge. Does not send a wearing signal. In addition, the portable electronic device is turned on / off by the power switch 4 that controls turning on / off of the portable electronic device, and an energization signal and a disconnection signal are generated.

  When the power of the portable electronic device is turned on with the power switch 4, chattering occurs when the power is turned on as shown in the timing diagram of the battery input (hereinafter referred to as the first) in FIG. Although the period seems to be long because it is conceptually shown in the figure, it is actually a very short period and irregularly high voltage level (hereinafter referred to as Hi level) to low voltage level (hereinafter referred to as Hi level). Hereinafter, the transition to the Low level) and the transition from the Low level to the Hi level are repeated in the chattering period. When the control circuit 3 receives a transition from the Hi level to the Low level (substantially a disconnection signal), it immediately controls the delay circuit 5 to instruct a delay of a predetermined period t. Even when the stop of the mounting signal from the voltage detection circuit 2 is generated, control for instructing the delay circuit 5 to delay for a predetermined period t is immediately performed with the reception of the mounting signal stop. Thus, both the disconnection signal generated by the power switch 4 and the stop of the mounting signal generated by the voltage detection circuit 2 are factors that turn off the power supply, and are therefore referred to as power-off factors. The energization signal generated by the power switch 4 and the mounting signal generated by the voltage detection circuit 2 are both factors that turn on the power supply and are therefore called power-on factors.

  When the control circuit 3 receives the power OFF factor, the P.P. ON. As shown in the timing diagram of Hi_3 (hereinafter referred to as second), transmission of the activation control signal “P.ON.Hi_3” to the power supply circuit 6 is stopped. When the control circuit 3 detects this power-off factor and the control circuit 3 receives the power-on factor within the delay period of the delay circuit 5, it is stored in the storage circuit 7. When the control circuit 3 detects the power ON factor after the delay period of the delay circuit 5 elapses, a Hi level activation control signal “P.ON.Hi — 3” is transmitted to the power supply circuit 6. That is, as soon as the power supply OFF factor is detected, the control circuit 3 stops the transmission of the start control signal “P.ON.Hi — 3” to the power supply circuit 6 (from the Hi level to the Low level), and the delay circuit 5 In a delay period (for example, a time longer than the discharge time of the residual voltage of the decoupling capacitor or the like), the start control signal “P.ON.Hi — 3” is controlled to be held at the low level. Further, when detecting the power ON factor, the control circuit 3 immediately controls the activation control signal “P.ON.Hi — 3” to the power supply circuit 6 from the Low level to the Hi level unless the delay period of the delay circuit 5 is detected. If it is within the delay period of the delay circuit 5, the storage circuit 7 is controlled to store the reception of the power ON factor. Note that the power ON factor is detected in a state where the power ON factor is detected by the control circuit 3 (for example, in the present embodiment, the energization signal is detected while the control circuit 3 is detecting the mounting signal). In this case, the activation control signal “P.ON.Hi — 3” continues to maintain the Hi level. On the contrary, as shown from the point e to the point g in FIG. 2, during the delay period t by the delay circuit 5 (from the point e to the point f) and after the passage (from the point f to the point g) from the power-off factor (point e in the drawing). If the control circuit 3 does not detect the power ON factor, the activation control signal “P.ON.Hi_3” to the power circuit 6 continues to maintain the Low level, and the control circuit 3 detects the power ON factor. (Point g in the figure), the control circuit 3 immediately sets the activation control signal “P.ON.Hi_3” to the Hi level and starts until the control circuit 3 detects the power-off factor (from point g to h in the figure). The control signal “P.ON.Hi — 3” is kept at the Hi level.

  As described above, when the control circuit 3 detects the power OFF factor and the control circuit 3 detects the power ON factor within the delay period of the delay circuit 5, the storage circuit 7 stores the power ON factor. For example, as shown from point a to point d in FIG. 2, the voltage detection circuit 2 detects the mounting signal at point a and transmits a start control signal “P.ON.Hi_3” to the power supply circuit 6 to the power supply circuit 6. When chattering occurs and the battery input is changed from the Hi level to the Low level at the point b, and the delay circuit 5 reaches the Hi level from the Low level at the point c during the delay period t. Then, the power ON factor at the point c is stored in the memory circuit 7, and the activation control signal “P.ON.Hi — 3” is transmitted to the power circuit 6 at the point d after a predetermined period t has elapsed.

  For example, even if an energization signal is transmitted to the control circuit 3 from the power switch 4 which is one of the power ON factors, in the state where the mounting signal is not transmitted to the control circuit 3, it cannot be actually energized. When the battery 1 is disconnected after being delayed by the delay period t, the power supply circuit 6 cannot be started. In such a case, the control circuit is configured to erase the stored contents stored in the storage circuit 7. You may give control by 3 etc. However, if the memory circuit 7 is volatile using the battery 1 as a power source, even the power ON factor (for example, point c in FIG. 2) that occurs during the chattering period, the chattering during the delay period t (point b in FIG. 2). When a volatile memory that can be stored only during energization is applied, it is preferable to use a backup battery or the like.

  That is, the memory circuit 7 turns on the power ON only when the control circuit 3 detects the power ON factor during the delay period t by the delay circuit 5 that maintains the activation control signal “P.ON.Hi — 3” at the low level. Memorize the factors. In the present embodiment, since the power ON factor is only the mounting signal and the energization signal, it is only necessary to store only the power ON factor that occurs last in the delay period.

  The delay circuit 5 has the same function as that of the delay circuit 45 of FIG. 4 in that the delay period t is measured. However, in the conventional configuration, the configuration provided in series with the control circuit 43 is as follows. In the present embodiment, the configuration provided in parallel to the control circuit 3 is different. Due to this difference in configuration, in the conventional configuration, as described with reference to FIG. 5, the activation control signal “P.ON.Hi_2” to the power supply circuit 46 is delayed. In this embodiment, since the delay circuit 5 is provided in parallel with the control circuit 3, the control circuit 3 transmits a delay start signal to the delay circuit 5 immediately after the power-off factor, The activation control which can be delayed for the delay period t and is not delayed in the delay period t when the activation control signal “P.ON.Hi — 3” is applied to the power supply circuit 6 and is an activation start signal of the electronic device. The power supply circuit 6 operates in synchronization with the generation of the signal “P.ON.Hi — 3”. The delay circuit 5 transmits a delay period end signal to the control circuit 3 in conjunction with the measurement of the delay period t, and the control circuit 3 immediately sends the start control signal “P.ON.Hi_3” to the power supply circuit by the delay period end signal. 6 to send.

  The measurement of the delay period t in the delay circuit 5 includes a configuration including an external clock circuit, a configuration based on a transmission frequency of a dedicated crystal oscillator, and the like. In addition, since the dedicated circuit is required in the above two examples, circuit space is required, and thus there is a problem such as a space loss and a cost increase due to an increase in the number of parts. For example, a movie, a digital still camera, etc. When a clock signal applied to a timepiece circuit that is standardly mounted on a portable electronic device is applied as a reference signal, space saving and cost reduction can be achieved. In addition, since the drive power source for driving the measurement circuit of the delay circuit 5 does not require a capacity, a back-up power source or a power storage component such as a capacitor, which is standard equipment in an electronic device, and a backflow of current accumulated in the power storage component are used. When a power storage circuit configured with a diode to be prevented is applied, it can be configured with a simple configuration and at a low cost. When these backup power supplies or power storage circuits are used, the reliability of the power activation device can be ensured in conjunction with the operation of the electronic device itself even when the battery 1 may be inadvertently detached from the mounting portion due to dropping or the like. .

  Further, the control circuit 3 starts and ends the delay period t of the delay circuit 5 and the storage circuit 7 according to the presence / absence of the mounting signal sent by the voltage detection circuit 2 and the energization signal and the disconnection signal sent by the power switch 4. The power ON signal is stored in the power supply circuit 6 and the activation control signal “P.ON.Hi — 3” is transmitted to the power supply circuit 6.

  As described above, according to the present embodiment, when the control circuit 3 immediately starts measuring the delay period t with respect to the delay circuit 5 upon reception of the power OFF factor, the activation control signal “P.ON.Hi_3” is set to Low. As soon as the power ON factor is detected by the control circuit 3, the control circuit 3 sets the start control signal “P.ON.Hi_3” to the Hi level while eradicating the adverse effects of chattering that always occur when the power is turned on. In order to increase this, it is possible to eliminate the activation waiting time from the power ON factor to the power supply circuit 6, so that it is possible to bathe the delay of the activation start time that is painful for the user. Further, when a power ON factor occurs during the delay period t, the power ON factor is stored in the storage circuit 7, and immediately after the predetermined period t ends, the control circuit 3 generates the start control signal “P.ON.Hi_3”. By doing so, it is possible to suppress the destruction of the components of the power supply circuit 6 due to the sudden application of a high voltage that often occurs during the power-on chattering period. The storage circuit 7 of the present embodiment is configured such that the delay circuit 5 stores the power ON factor during the delay period, and also stores the ON / OFF state of whether the power switch 4 is in the ON state or the OFF state. Is preferably adopted. When such a configuration is adopted, for example, when the power supply circuit 6 also serves as a power supply for the main body internal control unit that controls the operation of the main body, in the ON / OFF operation of the main body internal control circuit, the power is turned on or off. Only the operation of the main body can be controlled depending on the state.

  As described above, the power supply driving device according to the present invention is mainly intended to suppress adverse effects caused by chattering that always occurs in the power supply circuit when the power is turned on. Taking a movie as an example, a liquid crystal display / stop switch, EVF display / stop switch, a cover for opening and closing a cover for a replaceable medium such as a cassette tape or a disk, a changeover switch operated via a remote control, a power supply via an AC adapter Don't hesitate to switch on and off, switching between AC adapter and battery. These both act as power ON factors and power OFF factors, and are not necessarily independent of each other, and the power OFF factor and the power ON factor may occur simultaneously. An example thereof will be described with reference to FIG.

  In the figure, 21 is a secondary battery, 22 is a voltage detection circuit, 23 is a control circuit, 24 is a power switch, 25 is a delay circuit, 26, 28 and 29 are power circuits A, B and C, and 27 is a memory circuit, respectively. , 30 is an adapter connection circuit, 31 is a charging circuit, 32 is a changeover switch, and 33 is a charging control circuit. In the figure, wiring for applying a voltage from the secondary battery 21, the adapter connection circuit 30, and the charging circuit 31 to the power supply circuit A26, the power supply circuit B28, and the power supply circuit C29 is omitted. In the following embodiments, the power supply circuit A26 is a power supply circuit for the charging control circuit 33 and the main body control circuit 34, the power supply circuit B28 is a power supply circuit for an operation switch for operating the electronic device main body, and the power supply circuit C29 is an adapter connection circuit 30. As a driving power supply circuit for driving a portable electronic device via

  Similar to the battery 1 in FIG. 1, when the secondary battery 21 is mounted on a mounting unit provided in a portable electronic device (not shown), the voltage detection circuit 22 detects the mounting and transmits a mounting signal to the control unit 23. When the secondary battery 21 has a voltage sufficient to drive the portable electronic device via the power circuit A26, the voltage is supplied. That is, when the charge amount of the secondary battery 21 is insufficient and the voltage is lower than a predetermined value, the mounting signal is not sent to the control circuit 23. The power switch 24 controls turning on / off the power of the portable electronic device, and generates an energization signal and a disconnection signal.

  When the power of the portable electronic device is turned on by the power switch 24, chattering at the time of power-on occurs as in the previous embodiment. Chattering also occurs due to the generation of a mounting signal when the secondary battery 21 is mounted. When the control circuit 23 receives at least one of an energization signal or a mounting signal (hereinafter referred to as a power ON factor as in the previous embodiment) from the power switch 24 or the voltage detection circuit 22, the activation control signal “ P.ON.Hi_4 "is transmitted, and the voltage of the secondary battery 21 is applied to the power supply circuit A26. On the other hand, when at least one of the disconnection signal is transmitted from the power supply circuit 24 or the mounting signal is stopped from the voltage detection circuit 22 (hereinafter referred to as a power-off factor as in the previous embodiment) is transmitted to the control circuit 23. The delay circuit 25 immediately holds the activation control signal “P.ON.Hi — 4” at the low level for a predetermined period t (for example, a time longer than the discharge time of the residual voltage of the decoupling capacitor). The control circuit 23 controls the storage circuit 27 to store the reception of the power ON factor when the control circuit 23 receives the power ON factor during the predetermined period t, and starts immediately when the power ON factor is received after the predetermined period t has elapsed. The control signal “P.ON.Hi_4” is continuously converted to the Hi level, and the power supply circuit A26 activation control signal “P.ON.Hi_4” is transmitted. This is almost the same as the contents described in the previous embodiment. The storage circuit 27 also stores the ON / OFF state of whether the power switch 24 is ON or OFF.

  In the present embodiment, in addition to the secondary battery 21, an adapter connection circuit 30 that converts AC power to a portable electronic device and supplies DC power and a charging circuit 31 that charges the secondary battery 21 are also provided. The power supply path by these will be described next.

  As is well known, the adapter connection circuit 30 includes a conversion circuit that converts AC power into DC power, a stabilization circuit, and the like. The adapter connection circuit 30 is often used as a supply source for supplying power to the charging circuit 31 that charges the secondary battery 21, and this configuration is adopted in this embodiment. The changeover switch 32 supplies power to the portable electronic device directly from the AC power source via the adapter connection circuit 30 or supplies the power to the portable electronic device while charging the main body of the secondary battery 21, for example, via the charging circuit 31. Switch between. Even when power is supplied directly from the AC power source to the portable electronic device via the adapter connection circuit 30 or when power is supplied to the portable electronic device via the charging circuit 31, a power ON factor and a power OFF factor are generated. To do. In the present embodiment, for simplification of description, the energization signal and disconnection signal by the power switch 24 and the supply signal and disconnection signal that accompany the supply and stop of power supply from the adapter circuit 30 to the charging circuit 31 are omitted. Next, detection of the output voltage of the adapter connection circuit 30 by the voltage detection circuit 22, switching by the changeover switch 32, and a power ON factor or a power OFF factor due to the charge control circuit 33 described later will be described. The power supply circuit B28 will be described as an operation switch (in this embodiment, a shooting start / stop switch) of the portable electronic device main body, and the power supply circuit C29 will be described as a drive power supply circuit that drives the charging circuit 31.

  When power is supplied to the portable electronic device via the adapter connection circuit 30, a voltage is applied from a power supply line (not shown) to the power supply circuit B28, and the voltage detection circuit 22 is supplied to the portable electronic device of the adapter connection circuit 30. And the adapter connection circuit 30 transmits a mounting signal indicating that the mobile electronic device is mounted to the control unit 23. At this time, the mounting signal is not limited to information on the connection of the adapter connection circuit 30 but also generates a signal indicating whether or not the adapter connection circuit 30 has a voltage for driving the portable electronic device via the power supply circuit B28. . That is, the voltage detection circuit 22 also detects the stability and voltage value of the AC voltage applied to the adapter connection circuit 30, and does not send a mounting signal when both do not satisfy the predetermined value. In addition, a changeover switch 32 for switching the power source for the portable electronic device between the path through the adapter connection circuit 30 and another path (in this embodiment, the main body charging of the secondary battery 21), and a selection signal for which power path is selected Generate.

  When the voltage detection circuit 22 transmits a mounting signal to the control circuit 23 and the changeover switch 32 transmits the selection signal to the control circuit 23 by selecting the adapter connection circuit 30, the power supply is the same as described in the previous embodiment. Chattering occurs when throwing. When the control circuit 23 receives a shift from the Hi level to the Low level due to this chattering, it immediately controls the delay circuit 25 to instruct a delay of a predetermined period t. Even when the stop of the mounting signal is generated from the voltage detection circuit 22, the delay circuit 25 is immediately controlled to instruct a delay of the predetermined period t with the reception of the mounting signal stop. These correspond to the power-off factor in the previous embodiment, and the reverse is referred to as the power-on factor.

  When the power supply OFF factor is received by the control circuit 23, transmission of the activation control signal “P.ON.Hi — 6” to the power supply circuit B28 is stopped. When the control circuit 23 detects the power-off factor and the control circuit 23 receives the power-on factor within the delay period t of the delay circuit 25, the storage circuit 27 stores the power-on factor occurrence. When the control circuit 23 detects the power ON factor after the delay period t of the delay circuit 25 elapses, the Hi level activation control circuit “P.ON.Hi — 6” is transmitted to the power supply circuit B28. That is, as soon as the power supply OFF factor is detected, the control circuit 23 stops the transmission of the start control signal “P.ON.Hi — 6” to the power supply circuit B 28, and the start control signal “P.ON” is transmitted for a predetermined period t by the delay circuit 25. .Hi_6 "is held at the low level. Further, when the control circuit 23 detects the power ON factor, the control circuit 23 immediately controls the activation control signal “P.ON.Hi — 6” to the power supply circuit B 28 from the Low level to the Hi level unless it is within the delay period t of the delay circuit 25. If it is within the delay period t of the delay circuit 25, the storage circuit 27 is controlled to store the reception of the power ON factor. Note that, for example, when the control circuit 23 detects the mounting signal and the changeover switch 32 selects the adapter connection circuit 30, another power source is detected while the control circuit 23 detects the power ON factor. When the ON factor is detected, the control circuit 23 performs control to keep the activation control signal “P.ON.Hi — 6” at the Hi level. On the contrary, if the control circuit 23 does not detect the power ON factor during and after the delay period t by the delay circuit 25 from the power OFF factor, the activation control signal “P.ON.Hi — 6” to the power circuit B28 is detected. Continues to maintain the Low level, and immediately after the control circuit 23 detects the power supply factor, the activation control signal “P.ON.Hi — 6” is set to the Hi level, and the activation control signal “P.ON” is detected until the control circuit 23 detects the power OFF factor. P.ON.Hi — 6 ”is kept at the Hi level.

  As described above, when the control circuit 23 detects the power OFF factor and the control circuit 23 detects the power ON factor within the delay period t by the delay circuit 25, the storage circuit 27 stores the power ON factor. That is, when the voltage detection circuit 22 detects the mounting signal and transmits the activation control signal “P.ON.Hi_6” to the power supply circuit B28, chattering occurs in the power supply circuit B28, and the activation control signal “P.ON.Hi_6”. When the delay circuit 25 detects the power-on factor during the delay period t in conjunction with the change from the Hi level to the Low level, the power-on factor is stored in the memory circuit 27 and the predetermined circuit After the elapse of the period t, the activation control signal “P.ON.Hi — 6” is transmitted to the power supply circuit B28.

  Further, even when the control circuit 32 detects the power ON factor by selecting the adapter connection circuit 30 by the changeover switch 32, the start control signal “P.ON.Hi — 6” is transmitted to the electric circuit B28. Similarly, chattering occurs in the power supply circuit B28. Even in this chattering, as soon as the control circuit 23 detects the power-off factor, the delay circuit 25 is instructed to delay the predetermined period t. When the control circuit 23 detects the power-on factor during the delay period t, The ON request is stored, and immediately after the predetermined period t ends, the activation control signal “P.ON.Hi — 6” is immediately transmitted to the power supply circuit B28 based on the power ON reverberation stored in the storage means 27, and the power supply circuit B28 is energized. To start. When the control circuit 23 detects the power ON factor after the elapse of the predetermined period t, the activation control signal “P.ON.Hi — 6” is immediately sent to the power supply circuit B28.

  As described above, when the power supply OFF factor is detected by the control circuit 23, for example, the delay circuit 25 performs a delay for a predetermined period t longer than the discharge time of the residual voltage, and the activation control signal “P.ON.Hi_6” is In order to maintain a low level that does not start up the power supply circuit B28, it is possible to suppress a transient current from flowing to various electrical components constituting the power supply circuit B28 during at least an ON / OFF period caused by chattering and destroying the electrical components. . In addition, when the control circuit 23 detects the power ON factor, the activation control signal “P.ON.Hi — 6” is immediately transmitted to the power supply circuit B 28 unless it is within the delay period t by the delay circuit 25, and within the delay period t of the delay circuit 25. However, since the activation control signal “P.ON.Hi — 6” is transmitted to the power supply circuit B28 immediately after the delay period t ends, the problem that the actual operation of the power supply circuit B28 is delayed despite the command of the power ON factor is solved. it can.

  Next, a case where the secondary battery 21 is charged via the charging circuit 31 and power is supplied to the portable electronic device will be described. In the present embodiment, as described above, the case where the secondary battery 21 is charged by the portable electronic device main body (that is, the charging control circuit 33 is provided in the portable electronic device main body) will be described. The same applies to the case where the adapter connection circuit 30 supplies power to the portable electronic device even when it is outside the main body.

  When the secondary battery 21 is charged, the secondary battery 21 is insufficiently charged (predetermined voltage cannot be detected by the voltage detection circuit 22), and the secondary battery 21 can be used for a desired period of time to complete use of the portable electronic device. Generally, the charging control circuit 33 detects the state and three states of the fully charged state where the secondary battery 21 is fully charged. In addition, a voltage is applied to the charging circuit 31 from the insufficient charging state to the completion of the full charging. Here, the voltage supply from the adapter connection circuit 30 to the charging circuit 31 is stopped when the full power reception is completed, and the adapter connection is established. A case where power is supplied from the circuit 30 will be described as an example.

  When the secondary battery 21 is attached to the attachment portion of the portable electronic device, the voltage detection circuit 22 detects the voltage of the secondary battery 21. When the voltage detection circuit 22 detects that the secondary battery 21 satisfies the predetermined voltage, it is supplied from the secondary battery 21 as described above to the power supply circuit A26. When the voltage detection circuit 22 detects that the secondary battery 21 does not satisfy the predetermined voltage, the voltage is applied from the adapter connection circuit 30 to the charging circuit 31. At this time, if a predetermined voltage is not stably supplied from the adapter connection circuit 30, the control circuit 23 follows a path substantially similar to the voltage supply by the adapter connection circuit 30 described above, and the control circuit 23 starts the Hi level start control signal. “P.ON.Hi — 4” is applied to the power supply circuit A 26 to drive the charge control circuit 33. When the charge control circuit 33 is driven, the Hi level start control signal “P.ON.Hi — 5” is transmitted to the power supply circuit C29 and the power supply circuit A26 is in the start state. The activation control signal “P.ON.Hi — 7” is transmitted to the power supply circuit charging circuit 31 for control.

  Further, as described above, the charging control circuit 33 is in a state of insufficient charging that requires charging of the secondary battery 21, or a practical charging state in which the secondary battery stores a charge amount that can drive the drive unit of the portable electronic device. Or, it has a function of switching by normalizing a fully charged secondary battery. The charging circuit 31 is instructed to change the applied voltage at the moment when the charging state is changed from the insufficient charging state to the practical charging state and at the moment when the charging state is changed from the practical charging state to the full charging state. However, since this command only affects the inside of the charging control circuit 33, chattering does not occur, and the secondary battery 21 generates a Hi-level activation control signal “P.ON.Hi — 7” from the practically charged state to the fully charged state. Transmission control is performed on the charging circuit 31 without chattering.

  The activation control signal “P.ON.Hi_7” performed by the charging control circuit 33 when the state of the secondary battery 21 changes is controlled by the activation control signal “P.ON.Hi_4” and the activation control signal “P.ON.Hi_5”. "Is a power ON factor, and a power OFF factor and a power ON factor are generated in the activation control signal" P.ON.Hi_7 ". An example in which a power ON factor and a power OFF factor similar to this and a power ON factor occur simultaneously will be described with reference to FIG.

  In the figure, 35 is an operation switch of the main body of the portable electronic device, and 34 is a main body control circuit for controlling the operation switch. Hereinafter, the portable electronic device is commonly referred to as a movie for recording / reproducing moving images on a recording medium (not shown). An example in which the imaging device is used and the changeover switch 35 is a shutter release button will be described. Since the other configuration is the same as that in FIG. 3, the description is omitted. As is well known, in a movie, a subject reflected light image collected by a lens is converted into an electrical signal by an image sensor, and a shutter release button 35 is provided. When it is OFF, the electrical signal converted by the image sensor is displayed on the monitor screen as a through image. When the shutter release button 35 is ON, a recording unit (not shown) on the recording medium is activated (part of the power supply circuit B28). Display the captured image recorded on the monitor screen. Accordingly, the power ON factor and the power OFF factor of a part of the power supply circuit B that activates the recording unit by the shutter release button 35 are in a state where the power switch 24 is a power ON factor (other parts of the power supply circuit B28 are activated). appear. In a portable electronic device having an imaging function such as a movie, a state in which a through image called a standby state is displayed is shifted to a shooting state in which the shutter release button 35 is turned on. Since the cause is completed by the main body control circuit 34, chattering at the time of power activation does not occur.

  That is, the storage circuit 27 stores the through image display state in which the shutter release button 35 is caused by the power OFF factor. When the shutter release button 35 is turned ON, the memory circuit 27 transmits the power ON factor to the main body control circuit 34. The main body control circuit 34 controls the shutter to the ON state by giving the activation control signal “P.ON.Hi_8” to the power supply circuit B28. When the shutter release button 34 is turned off, the storage circuit 27 stores the OFF factor again, and the main body control circuit 34 maintains the low level for instructing the power supply circuit B28 to turn off the shutter.

  As described above, when the power ON factor is generated in the power supply circuit B28 that drives the main body control circuit 34, when the power OFF factor occurs and when the power ON factor occurs, the power OFF factor immediately By controlling the shutter to the ON state by the shutter OFF state and the power ON factor, the waiting time can be eliminated, for example, a quick start can be realized.

  As described above, in a portable electronic device, not only a shutter release button for starting and stopping imaging, but also a switch responsible for white balance adjustment, a zoom switch for determining an enlargement ratio of a subject, and a recording command for recording or reproduction on a recording medium. There are various switches such as re-switches, and it is preferable to have a main body control circuit that controls these switches in an integrated manner from the viewpoint of preventing chattering when the power is turned on by the ON / OFF operation of the switches. That is, in this embodiment, since the power supply circuit B28 of the main body control circuit 34 is provided independently of the control circuit 23, it is possible to eliminate the influence of chattering special to the power activation, and when the operation switches 35 are turned ON / OFF. The effect of chattering can be suppressed and a quick start can be realized.

  In each of the above-described embodiments, the changeover switch 24 is described as a power switch. However, the switch 24 is not limited to the power switch. For example, the monitor screen open / close switch, electric viewfinder open / close switch, and storage unit for storing a recording medium are opened and closed. An open / close switch on the cover, power ON / OFF using a wired remote controller, or the like may be used. In addition, the case where chattering occurs when the power is turned on has been described. However, the chattering is not limited to when the power is turned on. For example, the user resets the electronic device, and resets from a control circuit provided in an independent external device (for example, a video device or recording / playback The reset request from the video device or the recording / reproducing device in a system environment linked to the device may be used.

  3 has been described as a switch for switching between the adapter connection circuit and the secondary battery. Generally, since the adapter and the portable electronic device main body are connected by a jack, the jack is inserted. Functions such as switching based on whether or not there is a detection can be applied. Furthermore, although the control circuit in the figure has been described with three cases, the main body control circuit and the charge control circuit may be the same. That is, any internal control circuit and internal circuit as long as the configuration includes an internal control circuit that controls the drive unit of the electronic device main body, such as a main body control circuit and a charging control circuit, and a control circuit that controls the internal control unit The electronic device capable of instantaneous operation when driving the drive unit according to the operation of each operation unit while suppressing adverse effects caused by chattering at the time of power-on intended by the present invention, regardless of the power supply circuit controlled by be able to. If the control circuit adopts a configuration in which a large number of internal control circuits are controlled, only the internal control circuit to be controlled can be controlled by the large number of internal control circuits. In comparison, power consumption can be suppressed, and effects such as a longer battery life can be achieved.

  In FIG. 4, the changeover switch 35 is described as a shutter release button. However, for example, a lens barrier open / close switch for protecting a lens that collects a reflected light image of a subject such as a movie or a digital still camera, and enlargement / reduction of the subject. It may be a zooming switch for determining a rate, a change switch for changing a white balance, a camera function mode, or the like, a switch for switching video / audio to / from a recording medium, and the like.

  The present invention can be widely applied to portable electronic devices for which there is a strong demand for quick activation.

1 is a block diagram of a main part for explaining an embodiment of a power supply starter according to the present invention. Signal timing diagram in the same embodiment Main part block block diagram explaining other embodiment in power supply starting device of this invention Main part block block diagram explaining another embodiment in the power supply starting device of this invention Main block diagram of a conventional power activation device Conventional signal timing diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 2 Voltage detection circuit 3 Control circuit 4 Power switch 5 Delay circuit 6 Power supply circuit 7 Memory circuit

Claims (7)

Power supply means for supplying power to the electronic device;
Power detection means for detecting supply of power from the power supply means and generating a supply signal;
A switching means for generating an energization signal for energizing the electronic device and a disconnection signal for disconnecting the energization;
In response to the energization signal, the disconnection signal, and the supply signal, power supply means for energizing the electronic device with power from the power supply means;
Delay means for delaying a predetermined period after at least one of the stop of the supply signal by the power supply means or the generation of the disconnect signal by the switching means;
Storage means for storing at least one of a start point at which the delay means starts delay and the supply signal generated from the power detection means or the energization signal generated from the switching means within the predetermined period from the start point When,
A power supply starter comprising: a control unit configured to control energization of the power supply unit after the predetermined period from the start point with respect to the supply signal or the energization signal stored in the storage unit. When the storage means receives either the disconnect signal or the stop of the supply signal,
The power supply starter according to claim 1, wherein the control unit performs control to immediately stop energization of the power supply unit. When the storage means receives the disconnect signal and the supply signal simultaneously,
The control means controls the power supply means to give priority to the disconnection signal, performs control to store the supply signal in the storage means, and transmits the supply signal to the power supply means immediately after the predetermined period has elapsed. The power activation device according to claim 1, wherein control for performing the control is performed. The power supply starting device according to claim 1, wherein the power source for measuring the predetermined time in the delay unit is a backup power source provided in the electronic device. 2. The power supply starting device according to claim 1, wherein the power source for measuring the predetermined time in the delay unit includes a power storage unit having a capacity capable of operating the delay unit over at least the predetermined period, and a backflow prevention diode. 5. The power activation device according to claim 4, wherein the reference for measuring the predetermined period is a reference signal of a clock circuit. A power supply circuit that supplies power to an electronic device that operates by energization;
A power detection circuit for generating a supply signal to which power is supplied from the power supply circuit;
A switching circuit for generating an energization signal for energizing the electronic device and a disconnection signal for disconnecting the energization;
In response to the energization signal, the disconnection signal, and the supply signal, the electronic device includes a power supply circuit that conducts power from the power supply circuit to the electronic device,
A delay circuit that delays a predetermined period after at least one of the stop of the supply signal by the power supply circuit or the generation of the disconnect signal by the switching circuit;
A storage circuit that stores at least one of a start point at which the delay circuit starts delaying, and the supply signal generated from the power detection circuit and the energization signal generated from the switching circuit within the predetermined period from the start point When,
An integrated circuit for power activation, in which the supply signal or the energization signal stored in the storage circuit is integrated with a control circuit for energizing the power supply means after the predetermined period from the start point.