JP2018130016A - Battery-powered electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery-powered electronic device that detects installation of a battery with a simple configuration using no dedicated sensor or switch.SOLUTION: A control circuit 15 of a battery-powered electronic device (vacuum cleaner) 11 includes: a battery 13 attachable and detachable to and from a body; a computer 23 arranged in the body and operating with a power supply voltage from the battery; a self-holding type latch switch 31 connected between the battery and the computer for turning on and off the power supply voltage to the computer; and a mounting detection circuit that turns on the latch switch in response to mounting of the battery.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery-driven electronic device, and more particularly to an electronic device including a computer that operates with a voltage provided from a battery that can be attached to and detached from a main body, and a latch switch that turns on and off the voltage.

Various electronic devices using a battery as a power source and a computer such as a microcomputer are known. In recent years, with the advancement of batteries, small, lightweight and large capacity ones can be obtained at low cost. Accordingly, not only information processing devices such as mobile phones with relatively low power consumption but also vacuum cleaners equipped with motors are increasing in number. However, even if there is a difference in size, as long as the capacity of the battery is limited, reduction of power consumption is always an issue.
In a battery-driven electronic device equipped with a computer, it is necessary to supply power from the battery in order for the computer to operate (execute processing). Note that the terminal voltage of the battery drops with use. In order to stably operate the computer, the power from the battery is supplied to the computer after the voltage is stabilized by the power supply IC (IC1).

However, it is not preferable to continue supplying power to the computer while the electronic device is not operated from the viewpoint of reducing standby power consumption. Focusing on reducing this wasteful power consumption, switching means are provided to completely shut off the power source and the electronic circuit when the electronic circuit such as a computer is not operating, and environmental energy There has been proposed an electronic device that includes a power generation source that converts the power into electric energy and a switch control circuit that is driven by the power of the power generation source and controls a latching or switching type switching means (for example, Patent Document 1). reference).

Further, instead of the power generation source and the switch control circuit, a latch switch is applied to the switching means so that the switching means can be turned off when the computer finishes its work, and when the computer enters a standby state, the computer A configuration is known in which a latch switch is turned off to cut off battery power to the computer.

FIG. 8 is a circuit diagram showing an example of a configuration in which the computer can turn off the latch switch to cut off the battery power. In FIG. 8, a portion surrounded by a chain line is a latch switch SW131. The MPU 123 is a microcomputer. As shown in FIG. 8, the power supply from the battery 113 to the MPU 123 is turned on and off by the power MOSFET of Q101. When either one of the transistors Q131 and Q132 is turned on, a base current flows to the other and both are turned on. Then, the potential of the gate terminal of Q101 falls and Q1 is turned on. In the initial state in which the latch switch SW131 is off, both are off. For example, transistor Q132 is off, so no current flows through the base of transistor Q131 and Q131 remains off. In other words, transistor Q131 is off, so that no current flows through the base of transistor Q132 and Q132 remains off. If both the transistors Q131 and Q132 are off, the gate terminal of Q101 does not drop in potential and Q101 is off.

When the momentary switch SW130 is turned on for a moment in this state, a voltage is applied to the base of the transistor Q132, and the Q132 is turned on. Then, the potential at one end of the resistor R133 connected to the collector of Q132 is lowered. Since the other end of the resistor R133 is connected to the base of Q131, a base current flows through Q131 and Q131 is turned on. When Q131 is turned on, current flows from its collector through the resistor R134 to the base of Q132, so that Q132 remains on even when the switch SW130 is turned off. When Q132 is kept on, the base current of Q131 continues and Q131 is also kept on. If the on state of Q131 and Q132 continues, the potential of the gate terminal of Q101 decreases and Q101 continues to be on. This is the latch state.

The base of Q133 is connected to one of the output ports of the MPU 123 via a resistor R136. When the latch switch SW131 is in the ON latch state, Q133 is turned ON when the MPU 123 sets its output port to high. Then, the base of Q132 is grounded via Q133. Therefore, Q132 is turned off. Then, the base current of Q131 is cut off and Q131 is turned off. When Q132 and Q131 are turned off, Q101 is turned off. Thus, the latch state of the latch switch SW131 is released by the output from the MPU.
In FIG. 8, the letter “R” attached to each resistor and the three-digit number that follows it indicate the resistance element code, and the numerical value under each code indicates an example of the resistance value (unit: ohms). . The letter “C” attached to each capacitor and the three-digit number following it indicate the code of each element, and the numerical value below the code indicates an example of the capacitance (unit: farad).

JP 2007-43793 A

Since the energy of the battery is limited, there are many electronic devices that can be attached to and detached from the main body for replacement or charging. If the battery is not properly attached to the main body of these electronic devices, not only the original performance cannot be demonstrated, but also a normal power supply voltage is not provided to the computer that operates with the battery as a power source, and it does not work or unstable operation There is a risk of malfunction.
Therefore, the part where the battery is mounted is mechanically considered so that the battery is mounted securely and safely, but there is also a device that electrically detects that the battery is mounted and notifies the user. is there. Since the computer operates when the battery is attached, the computer informs the user that the battery has been normally attached by display, sound (including sound) or the like. Since the notification is made, the user can recognize that the installation of the battery is completed, and the user's erroneous operation related to the installation of the battery can be prevented.

However, if a dedicated sensor or switch is used to electrically detect battery attachment, the cost increases. There is a demand for a method capable of detecting battery attachment without using a dedicated sensor or switch.
The present invention has been made in consideration of the above-described circumstances, and is a simple method that does not use a dedicated sensor or switch in a battery-driven electronic device in which power supply to an on-board computer is turned on and off with a latch switch. The present invention provides a method that can detect battery mounting with a simple configuration.

The present invention relates to a battery that can be attached to and detached from a main body, a computer that is disposed in the main body and operates with a power supply voltage from the battery, and is connected between the battery and the computer to turn on and off the power supply voltage to the computer. Provided is a battery-driven electronic device comprising a self-holding type latch switch and a mounting detection circuit that turns on the latch switch in response to mounting of the battery.

Since the battery-driven electronic device according to the present invention includes a mounting detection circuit that turns on the latch switch in response to mounting of the battery, the mounting of the battery can be detected with a simple configuration that does not use a dedicated sensor or switch. . Since the attachment detection circuit turns on the latch switch in response to detection of the attachment of the battery, the voltage of the battery is provided to the computer and the computer operates. Then, the computer can notify the user that the battery is attached.

It is explanatory drawing which shows the electrical structural example of the battery drive type vacuum cleaner which is one aspect | mode of the electronic device of this invention. It is a circuit diagram which shows the structure of the latch switch which has the mounting | wearing detection circuit based on this invention. (Embodiment 1) It is a circuit diagram which shows a different structure of the latch switch which has the mounting | wearing detection circuit based on this invention. (Embodiment 2) It is a circuit diagram which shows the further different structure of the latch switch which has the mounting | wearing detection circuit based on this invention. (Embodiment 3) 4 is a flowchart illustrating processing executed by an MPU in the embodiment of the present invention. (Initial stage of processing) 4 is a flowchart illustrating processing executed by an MPU in the embodiment of the present invention. (During operation and standby 1) 4 is a flowchart illustrating processing executed by an MPU in the embodiment of the present invention. (During operation and standby 2) It is a circuit diagram which shows the structural example of the conventional latch switch.

Hereinafter, the present invention will be described in more detail with reference to the drawings. In addition, the following description is an illustration in all the points, Comprising: It should not be interpreted as limiting this invention.

(Embodiment 1)
≪Configuration of battery-powered vacuum cleaner≫
FIG. 1 is an explanatory diagram showing an electrical configuration of a battery-driven vacuum cleaner as one embodiment of the electronic apparatus of the present invention. For the sake of clarity, only the parts closely related to the present invention are extracted, and some well-known elements are omitted. In this embodiment, the cleaner 11 is a canister-type cleaner, and is roughly divided into a cleaner body, a suction hose 17, and a battery 13. The battery 13 and the suction hose 17 can be attached to and detached from the cleaner body, and are electrically connected via a connector. The battery 13 has battery terminals 13a and 13b, and is connected to the cleaner body via the battery terminals 13a and 13b. The battery 13 is assumed to be a secondary battery such as a lithium ion battery, but is not limited thereto. The battery 13 may be accommodated inside the cleaner body while being attached to the cleaner body and covered with a lid, or may be exposed to the outside of the cleaner body.

In FIG. 1, the control circuit 15 is disposed on the cleaner body. The driving strength / weakness switch 30 is a momentary type switch and is disposed in the suction hose 17. The driving strength / weakness switch 30 corresponds to a work start switch according to the present invention. However, FIG. 1 is merely an example. For example, the driving strength / weakness switch 30 may be provided in the cleaner body instead of the suction hose 17. Furthermore, the cleaner 11 is not limited to the canister type, and may be, for example, a self-propelled cleaner or a handy type cleaner that does not have the suction hose 17. Furthermore, the electronic device of the present invention is not limited to a vacuum cleaner.

Returning to the description of FIG. The control circuit 15 includes a latch switch 31, a power supply IC 21, and MPU2.
3 and a motor drive circuit 25. The motor drive circuit 25 drives the motor of the electric blower 29 arranged in the cleaner body.
In this embodiment, the latch switch 31 is a latch switch SW131 shown in FIG.
In addition to this function, it has the function of the mounting detection circuit according to the present invention. That is, the battery 13 is triggered to be turned on in response to the battery 13 being attached to the cleaner body. Details will be described later. The power supply IC 21 is the same as the power supply IC (IC1) of FIG. The MPU 23 corresponds to the computer of the present invention. The MPU 23 controls the motor drive circuit 25. Further, the on / off state of the operation strength / weak switch 30 and the off switch 32 and the state of attachment / detachment of the suction hose 17 are read.

The resistors R11 and R12 in the control circuit 15 constitute a voltage dividing circuit. Resistance R1
One end of 1 is connected to the battery terminal 13 a via a latch switch 31. The voltage of the battery terminal 13a is divided by the resistors R11 and R12 to generate the signal Vin, which is input to the MPU 23 and internally A / D converted. That is, the MPU 23 reads the voltage level obtained by dividing the voltage of the battery terminal 13a. When the power supply IC 21 is a step-down stabilized power supply circuit, the MPU 23 operates with a power supply voltage lower than the output voltage of the battery 13. Therefore, if the voltage of the battery terminal 13a is input without being divided, the upper limit of A / D conversion is exceeded, and the output voltage of the battery 13 cannot be read correctly. The voltage dividing circuit of the resistors R11 and R12 converts the voltage of the battery terminal 13a into a voltage Vin in a range that the MPU 23 can correctly read. The rated voltage of the battery 13 is 18V, for example. The output voltage of the power supply IC 21 is 5 V as an example.

The resistors R13 and R14 in the control circuit 15 constitute a voltage dividing circuit, and the voltage dividing circuit corresponds to the switch reading circuit of the present invention. One end of the resistor R13 (location indicated by a latch-on signal in FIG. 1) is connected to the battery terminal 13a via the driving strength / weakness switch 30. The potential of the latch-on signal is equal to the output voltage of the battery terminal 13a when the driving strength / weak switch 30 is on, but becomes the ground potential when the driving strength / weak switch 30 is off. This latch-on signal is connected to the latch switch 31. When the driving strength / weak switch 30 is pressed and turned on, the latch switch 31 enters a latching state and is kept on, and power is supplied to the MPU 23.
Further, the latch-on signal is divided by the resistors R13 and R14 to generate the voltage signal V1, which is input to the MPU 23 and internally A / D converted. The voltage dividing circuit of the resistors R13 and R14 converts the voltage of the latch-on signal into a voltage signal V1 in a range that the MPU 23 can correctly read.

One of the output ports of the MPU 23 is connected to a latch switch 31 (indicated by a latch release signal in FIG. 1). When the MPU 23 makes its output port high, the latch state of the latch switch 31 is released. This portion corresponds to the latch release circuit of the present invention.
In this embodiment, when the driving strength / weak switch 30 is pressed when the cleaner 11 is in the power-off state, the latch switch 31 is turned on and power is supplied to the MPU 23. Then, the MPU 23 starts executing (processing) a predetermined control program. In the initial stage of processing, the MPU 23 reads the voltage levels of the input signals Vin and V1.

It is preferable to set the voltage dividing ratio by the resistors R11 and R12 equal to the voltage dividing ratio by the resistors R13 and R14. By equalizing the voltage dividing ratio between the two, it becomes easy to compare the voltage levels of Vin and V1. This can be easily realized if the resistance values of R11 and R13 are equal to each other and the resistance values of R12 and R14 are equal to each other.

One end of the resistor R15 and one end of the off switch 32 are both connected to the battery terminal 13a via a connector 17a that connects the suction hose 17 and the cleaner body. A voltage signal V2 at a connection point between the resistors R16 and R17 is input to the MPU 23.
The voltage of the battery terminal 13a is divided by resistors R15 to R17 to become a voltage signal V2.
The voltage signal V2 is input to the MPU 23 and A / D converted. The voltage dividing circuit of the resistors R15 to R17 converts the terminal voltage of the battery 13a into a voltage signal V2 in a range that the MPU 23 can correctly read. The voltage division ratio changes depending on whether the off switch 32 is on or off, and the voltage level of V2 changes accordingly.

The voltage dividing circuit of the resistors R15 to R17 is configured to turn on / off the off switch 32 and the suction hose 1.
7 detection of the mounting state of 7 is enabled.
When the suction hose 17 is attached, the potential of V2 becomes a level obtained by dividing the voltage of the battery terminal 13a by the resistors R15 and R17. When the suction hose 17 comes off, V2 becomes the ground potential. Further, when the off switch 32 is turned on, the potential of V2 becomes a level obtained by dividing the voltage of the battery terminal 13a by the parallel resistance of the resistors R15 and R16 and R17.

As described above, the combination of the insertion / extraction of the suction hose 17 and the on / off of the off switch 32 results in V
2 takes three levels. The MPU 23 monitors the voltage level of V2 to recognize the disconnection of the suction hose 17 and the operation of the off switch. The MPU 23 sequentially monitors the voltage level of V2 during operation.

The MPU 23 determines the voltage level of V2 based on the voltage level of Vin.
Actually, there are measurement errors due to variations in circuit element characteristics and noise.
1) The state in which the suction hose 17 is disconnected, (2) the state in which the suction hose 17 is attached and the off switch 32 is off, and (3) the state in which the suction hose 17 is attached and the off switch 32 is on. Three windows are determined in advance. If the voltage level of V2 is within the range of any window, the state is recognized, but if V2 does not fit in any window, it is ignored as noise.

When it is detected that the off switch 32 is turned off, the MPU 23 determines that it has received an instruction to stop operation, stops the electric blower 29 (not shown), and shifts to a standby state. In the standby state, when no operation is performed for a predetermined period, the latch release signal is set high. As a result, the latch switch 31 is turned off, and the power supply to the MPU 23 is interrupted.

The operation of the driving strength / weakness switch 30 is performed by a person. Even if it is a momentary on as a sense of operation performed by a person, a sufficiently long period of time elapses compared to the following circuit operation. In other words, when the driving strength / weak switch 30 is pressed, the latch switch 31 is turned on, and the MPU 23 starts processing to read the voltage levels of Vin and V1. Therefore, when the MPU 23 reads the voltage levels of Vin and V1 after the operation is started, it is assumed that the driving strength / weak switch 30 is still pressed and is kept on.
In addition, when it is assumed that it takes time to read the voltage levels of Vin and V1 after the driving strength / weak switch 30 is turned on, the delay circuit 25 may be inserted into V1. A simple configuration of the delay circuit 25 can be realized by a resistor and a capacitor. Since the delay circuit 25 is not an essential component, it is indicated by a chain line. Thus, by devising the circuit configuration, when the MPU 23 reads the voltage levels of Vin and V1 after the operation starts, it is assumed that the driving strength / weak switch 30 is kept on.

The MPU 23 reads the voltage levels of Vin and V1 and makes the following determination. When the driving strength / weak switch 30 is on, the latch-on signal is equal to the voltage at the battery terminal 13a. Therefore, the voltage levels of V1 and Vin must be approximately equal. If the voltage levels of V1 and Vin are different, it is considered that the disturbance switch is superimposed on the latch-on signal and the latch switch 31 is turned on. Therefore, when it is determined that the voltage levels of V1 and Vin are different, the MPU 23 may release the latch state of the latch switch 31 by setting the latch release signal high. If it does so, the electric power supply to MPU23 will be interrupted | blocked and a process will stop. In this way, even if the latch switch 31 is turned on when the user does not intend due to the influence of disturbance noise, the latch switch 31 can be cut off by itself at the initial stage when the MPU 23 starts processing. Therefore, it is possible to prevent the power from being turned on due to a malfunction and to suppress wasteful power consumption of the battery 13.

Further, when the latch switch 31 is in a latched state due to normal power-on and the operation of the cleaner 11 is started, even if the driving strength / weak switch 30 is turned on during the operation, the state of the latch switch 31 is not affected. On the other hand, the MPU 23 can recognize the on / off state of the driving strength / weakness switch 30 by sequentially monitoring V1 during driving. In this embodiment, when the driving strength / weak switch 30 is turned on during driving, the MPU 23 recognizes this and controls the motor drive circuit 25 to change the rotational speed of the electric blower 29 from the high speed corresponding to “strong”. Switch to low speed corresponding to “weak” or vice versa. In order to determine the ON / OFF state of the driving strength / weak switch 30 during driving, the MPU 23 makes a determination by sequentially comparing Vin and V1. And if both are substantially equal, it will recognize that the driving strong / weak switch 30 is an ON state.

In reality, there are variations in circuit element characteristics and measurement errors.
If 0 falls within a predetermined level range (ON window), it is determined to be ON, and if it falls within a predetermined level range (OFF window), it is determined to be OFF. .
The voltage of the battery terminal 13a decreases with use. Along with this, the Vin level also decreases. Similarly, the V1 level when the driving strength / weak switch 30 is on also decreases.

The MPU 23 reads the voltage levels of Vin and V1, and compares the voltage level of V1 with the level of Vin to determine whether the driving strength / weak switch 30 is in the on window or in the off window. Therefore, even if the voltage of the battery terminal 13a changes with use, it is possible to correctly recognize whether the driving strength / weakness switch 30 is on or off.
If the voltage level of V1 does not fit in either the on or off window, MPU2
3 can be recognized that noise is superimposed on the latch-on signal. If it is recognized as noise at the initial stage of processing, a latch release signal may be output. During driving, no operation is performed and the driving strength / weak switch 30 may be ignored as being off.

As described above, the driving strength / weak switch 30 has a function as hardware for turning on the latch switch 31 and a function as means for giving an instruction for software processing by causing the MPU 23 to monitor the on and off states.

≪Latch switch operation when the battery is installed≫
Next, the configuration of the mounting detection circuit according to the present invention will be described.
FIG. 2 is a circuit diagram showing a configuration of a latch switch SW31 having a mounting detection circuit according to the present invention. Note that the latch switch SW31 is inside a rectangle surrounded by a one-dot chain line in FIG. In order to make the connection relationship with the surroundings easy to understand, the battery 13, the power supply IC 21, the MPU 23, and the like are shown. If the conventional configuration of FIG. 8 is compared with FIG. 2, the configuration of the mounting detection circuit will be easily understood. The description of the same configuration as in FIG. 8 is omitted to avoid duplication, and only the portions different from FIG. 8 will be described.
Those corresponding to the capacitor C131 of FIG. 2 are removed from the configuration of FIG. Further, a capacitor C33 is added. One end of the capacitor C33 is connected to the base of the transistor Q31, and the other end is grounded and connected in parallel with the resistor R33 and the transistor Q32.

When the battery 13 is attached to the cleaner body, the voltage of the battery 13 is applied to the emitter of Q31 via the resistor R31, and a step-like steep voltage rise occurs. On the other hand, a capacitor C33 is connected to the base of the transistor Q31. Due to the capacitance component, the voltage at the base of Q31 cannot follow the steep rise in voltage on the emitter side. A delay of a time constant determined by the resistor R31 and the capacitor C33 occurs with respect to the emitter, and a potential difference is generated between the emitter and the base of the transistor Q31 due to the delay. Due to this potential difference, a forward current flows through the base of the transistor Q31 and the transistor Q31 is turned on.

When transistor Q31 is turned on, the potential at the collector of Q31 rises. A voltage is applied to the base of transistor Q32 connected to the collector of Q31 via resistor R34. Q32 is turned on by the voltage. When Q32 is turned on, a current flows through a resistor R33 between the base and emitter of Q31, as in the description of FIG. Accordingly, even after the emitter voltage of the transistor Q31 rises to the voltage of the battery 13, the Q31 remains on. When the on state of Q31 and Q32 continues, the potential of the gate terminal of Q1 falls and Q1 continues to be on. It is in a latched state.

As described above, by inserting the capacitor C33, the latch switch SW31 is turned on when the battery 13 is attached to the cleaner body. The capacitor C33 corresponds to the mounting detection circuit according to the present invention.
Note that the capacitor (corresponding to C131 in FIG. 8) in parallel with the resistor R132 is removed from the circuit in FIG. If the capacitor is connected in parallel with the resistor R132, the emitter and base of Q31 are connected in an alternating manner via the power MOSFET Q1. When the emitter voltage of the transistor Q31 rises sharply as the battery 13 is attached to the cleaner body, a potential difference is unlikely to occur between the emitter and base of Q31. Therefore, it becomes difficult to turn on Q31. In order to avoid this, the capacitor in parallel with the resistor R132 is removed.

(Embodiment 2)
Different aspects of the mounting detection circuit shown in FIG. 2 will be described.
FIG. 3 is a circuit diagram showing a configuration example different from FIG. 2 of the mounting detection circuit according to the present invention.
In the circuit shown in FIG. 3, the one corresponding to the capacitor C33 in FIG. 2 is removed. Further, when compared with FIG. 8, the one corresponding to the capacitor C131 in FIG. 8 is removed. In FIG. 3, the same reference numerals are given to circuit components corresponding to FIG.

As described in the first embodiment, if a capacitor corresponding to C131 in FIG. 8 is connected, when the battery 13 is attached and the emitter voltage of the transistor Q31 rises sharply, there is a potential difference between the emitter and base of Q31. It becomes difficult to occur. Therefore, it becomes difficult to turn on Q31.
In other words, Q31 can be easily turned on when the battery 13 is attached by simply removing C131 in FIG. Transistor Q32 has a capacitive component, and the capacitive component produces the same effect as C33 shown in FIG. The configuration shown in FIG. 3 is a case where the capacitance component of the transistor Q32 functions as a mounting detection circuit without connecting the capacitor C33 as a circuit element.

(Embodiment 3)
Further different aspects of the mounting detection circuit will be described.
FIG. 4 is a circuit diagram showing a further different configuration example of the mounting detection circuit according to the present invention.
Compared to FIG. 8, the difference is that a capacitor C35 and a diode D1 are added. The cathode of the diode D1 is connected to the base of the transistor Q32, and the anode is connected to the battery 13 via the capacitor C35. Capacitor C35 and diode D1 form a differentiating circuit and respond to the rise of the voltage caused by the attachment of battery 13 to the cleaner body.

That is, when the battery 13 is attached to the vacuum cleaner main body, a voltage is applied to the terminal of the capacitor C35 connected to the battery 13 and a stepped steep rise occurs. Due to the capacitance component of the capacitor C35, the potential of the anode terminal of the diode D1 rises at the rise of the voltage, and a forward current flows through D1. As a result, the potential at the base of the transistor Q32 rises and Q32 is turned on. Then, a current flows through the resistor R33 connected to the base of Q31, and Q31 is turned on. When Q31 is turned on, the potential of the collector of Q31 rises, and a current flows through the resistor R34 to the base of Q32. Therefore, Q32 is kept on even after the voltage rises with the attachment of the battery 13 to the cleaner body. Therefore, Q31 is also kept on. When the on state of Q31 and Q32 continues, the potential of the gate terminal of Q1 falls and Q1 is kept on (latched state). The diode D1 is inserted for preventing backflow. That is, when the driving strength / weak switch 30 is pressed and turned on while the battery 13 is attached to the main body of the vacuum cleaner, the cathode potential of the diode D1 rises in a step-like manner as it is turned on. At this time, the discharge current of the capacitor C35 is prevented from flowing to the battery 13 side.
According to this aspect, the current flows to the base of Q32 due to the rise of the voltage accompanying the attachment of the battery 13 to the cleaner body, and Q32 is first turned on. Q31 is turned on as Q32 is turned on. As in FIG. 8, even if the capacitor C31 is connected in parallel with the resistor R32, the operation is not hindered.

≪Flowchart≫
Hereinafter, processing executed by the MPU 23 will be described using a flowchart.
5 to 7 are flowcharts showing a procedure of processing executed by the MPU 23 in this embodiment.
FIG. 5 is an initial stage process in which power is supplied to the MPU 23 and the execution of the process is started.
FIG. 6 and FIG. 7 show the processing when the vehicle is in the standby state and in operation through the initial stage. Each of them shows processing deeply related to the present invention, and other processing is omitted.

The MPU 23 that has started processing when the latch switch 31 is turned on and supplied with power from the battery 13 first executes initialization processing required for operating the control circuit such as initial setting of the memory and input / output ports. (Step S11 in FIG. 5).
Thereafter, the MPU 23 reads the voltage of Vin obtained by dividing the voltage of the battery terminal 13a (step S13). The voltage of Vin is a voltage used as a reference when determining the levels of V1 and V2.

Subsequently, the MPU 23 reads the level of the voltage signal V1 indicating the on / off state of the driving strength / weak switch 30 (step S15). Then, it is checked whether or not the level of V1 is within a predetermined range (window) with respect to the level of Vin (step S17). The range is a voltage in a range that is determined in advance as a value that should be recognized that the driving strength / weak switch 30 is on.
If the level of V1 is in the ON window (Yes in step S17), MPU2
3 determines that the driving strength / weak switch 30 has been activated by being pressed. In that case, the MPU 23 then reads the level of the voltage signal V2 (step S19). Then, it is determined whether or not the level of V2 is within a predetermined range in which it is determined that the suction hose 17 is attached (step S21). If the level of V2 is within the window to be determined that the suction hose 17 is attached (Yes in step S21), the electric blower 29
The motor drive circuit 25 is controlled so as to rotate at “strong” (step S23). Then, the routine proceeds to the standby state and the process during operation shown in step 31 and subsequent steps in FIG.

On the other hand, if the level of V2 is not within the window to be determined that the suction hose 17 is attached (No in step S21) in step S21, the routine does not rotate the electric blower 29 and the routine proceeds to step 31 in FIG. The process proceeds to the standby state and the process during operation described below.
The description returns to step S17. In step S17, when the level of V1 is not in the ON window (No in step S17), the MPU 23 determines that it has been activated by mounting the battery 13. Then, the user is notified that the battery is attached (step S25 in FIG. 6). Thereafter, the routine proceeds to a standby state and a process during operation shown in step 31 and thereafter.

In step S31, the MPU 23 newly reads the reference voltage Vin (step S31).
Subsequently, the MPU 23 reads the level of V1 indicating the state of the driving strength / weakness switch 30 (step S33). Then, it is checked whether or not there is a level of V1 within a window that is predetermined as a voltage to be recognized as the driving strength / weak switch 30 being on (step S35).

If the level of V1 is within the ON window (Yes in step S35), MPU2
3 determines that the driving strength / weakness switch 30 has been pressed again. Then, the level of V2 is read (step S37), and it is determined whether or not the level is within a predetermined range in which it is determined that the suction hose 17 is attached (step S39). If the level of V2 is within the window in which it is determined that the suction hose 17 is attached (Yes in step S39), it is checked whether or not the electric blower 29 is operating at "strong" (step S43). If it is strong and driving, the motor drive circuit 25 is controlled to switch to “weak” (step S45). Thereafter, the routine returns to step S31 described above.

On the other hand, when the electric blower 29 is “strong” and not operating (No in step S43), the MP
U23 controls the motor drive circuit 25 to rotate the electric blower 29 "strongly" (step S47). Thereafter, the routine returns to step S31 described above.
If it is determined in step S39 that the suction hose is not attached (No in step S39), the MPU 23 controls the motor drive circuit 25 to stop the electric blower 29 (step S41). Thereafter, the routine returns to step S31 described above.

The description returns to step S35. If it is determined in step S35 that the level of V1 is not within the ON window (No in step S35), the routine proceeds to step S51 in FIG.
In step S51 in FIG. 7, the MPU 23 determines whether or not the level of V2 is within the window in which it should be determined that the OFF switch 32 has been pressed. When it is determined that the off switch 32 has been pressed (Yes in Step S51), the MPU 23 controls the motor drive circuit 25 so as to stop the rotation of the electric blower 29 (Step S53). Thereafter, the routine returns to step S31 in FIG.

On the other hand, when it is determined that the off switch 32 is not pressed (No in step S51),
Subsequently, the MPU 23 determines whether or not the level of V2 is within a predetermined range in which it is determined that the suction hose 17 is attached (step S57). When the level of V2 is within the window in which it is determined that the suction hose 17 is attached (Yes in step S57)
s) The routine proceeds to step S61 while maintaining the state of the electric blower 29.
On the other hand, if the level of V2 is not within the window to be determined that the suction hose 17 is attached (No in step S57), the motor drive circuit 25 is controlled to stop the rotation of the electric blower 29 (step S57). (S59) The routine proceeds to step S61.

In step S61, the MPU 23 checks whether or not a predetermined period has elapsed in a state in which neither the driving strength / weak switch 30 nor the off switch 32 is operated. An example of the period is 30 seconds, but is not limited thereto. When a predetermined period of time elapses in the non-operating state (Yes in step S61), the MPU 23 sets the latch release signal to high (step S63). As a result, the latch state of the latch switch 31 is released and the latch switch 31 is turned off. As a result, the MPU 23 is disconnected from the battery 13, the power supply voltage is lost, and the MPU 23 stops processing.
On the other hand, even if the no-operation state continues, the predetermined period is not reached (step S61).
No), the routine returns to step S31 in FIG.
The procedure of the process executed by the MPU 23 has been described above.

As mentioned above,
(I) A battery-driven electronic device according to the present invention includes a battery detachable from the main body,
A computer that is disposed in a main body and operates with a power supply voltage from the battery, a self-holding type latch switch that is connected between the battery and the computer and that turns on and off the power supply voltage to the computer, and mounting the battery And a mounting detection circuit that turns on the latch switch in response to the above.

Furthermore, the preferable aspect of this invention is demonstrated.
(Ii) a latch release circuit that turns off the latch switch in response to an output from the computer, a momentary type work start switch that gives the latch switch a trigger to turn on, and the work start switch is turned on or off. And a switch reading circuit that causes the computer to read the power, and the computer determines whether the work start switch is on or off when the power supply voltage is provided from the battery and the operation is started. In some cases, the work associated with the work start switch is started, but when it is determined to be off, the work may not be started.
In this way, the computer determines the state of the work start switch when the power is turned on and starts operation, that is, when the work start switch is turned on, the latch switch is turned on and the operation is started. It is possible to correctly recognize whether the latch switch is turned on or the operation is started by mounting the battery. The process to be executed can be correctly selected according to the result.

(Iii) The mounting detection circuit may turn on the latch switch with a rise in voltage generated when the battery is mounted on the main body as a trigger.
In this way, the latch switch can be turned on with a circuit having a simple configuration that uses the rise of the voltage generated when the battery is mounted.

(Iv) The computer may notify that the battery is mounted when the operation start switch is determined to be off when the power supply voltage is provided from the battery and the operation is started. .
In this way, it is possible to correctly recognize that the battery is attached and notify the user of the attachment.

(V) When the work start switch is turned on, the voltage of the battery terminal is guided to the latch switch to give a trigger to turn on the latch switch, and the switch reading circuit is turned on when the work start switch is turned on. The battery terminal voltage may be configured to be guided to an input of the computer.
According to this aspect, when the computer starts the operation when the work start switch is turned on and the latch switch is turned on, and when the battery is installed and the computer starts the operation, It is possible to correctly determine the on / off state of the start switch and determine which of the triggers to start the operation.
Preferred embodiments of the present invention include combinations of any of the plurality of embodiments described above.
In addition to the embodiments described above, there can be various modifications of the present invention. These modifications should not be construed as not belonging to the scope of the present invention. The present invention should include the meaning equivalent to the scope of the claims and all modifications within the scope.

11: Vacuum cleaner, 13, 113: Battery, 13a, 13b: Battery terminal, 15: Control circuit, 17: Suction hose, 21: Power supply IC, 23, 123: MPU, 25: Motor drive circuit, 27: Delay circuit, 29: Electric blower,
30: Driving strength / weak switch, SW130: Switch, SW31, SW131: Latch switch, 32: Off switch, C31, C33, C35, C131: Capacitor, D1: Diode, R11, R12, R13, R14, R15, R16, R17: Resistance, Q31, Q32: Transistor, V1, V2: Voltage signal

Claims (3)

A battery detachable from the main body,
A computer that is arranged in the main body and operates with a power supply voltage from the battery;
A self-holding type latch switch connected between the battery and the computer for turning on and off a power supply voltage to the computer;
A battery-driven electronic device comprising: a mounting detection circuit that turns on the latch switch in response to mounting of the battery. A latch release circuit for turning off the latch switch in response to an output from the computer;
A momentary-type work start switch that gives the latch switch a trigger to an ON state;
A switch reading circuit that causes the computer to read whether the work start switch is on or off;
The computer determines whether the work start switch is on or off when a power supply voltage is provided from the battery and starts operation, and when it is determined to be on, starts the work associated with the work start switch. The electronic device according to claim 1, wherein the operation is not started when it is determined that is turned off. 3. The electronic device according to claim 1, wherein the attachment detection circuit turns on the latch switch using a rise in voltage generated when the battery is attached to the main body as a trigger.