JP6502985B2 - Power shut off circuit - Google Patents

Description

  The present invention relates to a power shutoff circuit that shuts off power supply to an accessory socket provided in a vehicle or a power generation device as needed.

  In a vehicle equipped with a storage battery for starting a motor of an internal combustion engine, it may be possible to manually start the motor by a kick starter or a push. Such a vehicle can start the prime mover even when the storage battery for starting is removed (hereinafter, the storage battery excluded state). In the storage battery exclusion state, in order to prevent a short circuit of the storage battery during maintenance, it is assumed that the wiring is removed from at least the negative electrode of the storage battery, or the storage battery is removed for charging.

  In the storage battery exclusion state, it may be necessary to start the prime mover, for example, for maintenance or testing. The vehicle may be equipped with an accessory socket for supplying, for example, 12V power to an external device. When the prime mover is started in the storage battery excluded state, a voltage obtained by rectifying the output of the generator (hereinafter, "rectified voltage") is directly supplied to the accessory socket.

  On the other hand, the external device connected to the accessory socket is premised on the power supply in the state where the storage battery is connected, and the maximum voltage that can be supplied to the external device is generally specified to be about 15 V, When the prime mover is started in the storage battery exclusion state, the peak value of the voltage supplied to the accessory socket may exceed the maximum voltage of the external device connected to the accessory socket. Therefore, it is desirable to prevent supply of high peak voltage to the accessory socket when the motor is started in the storage battery excluded state.

  In the above, for ease of understanding, the accessory socket provided in the vehicle has been described as an example. However, the above problems occur not only in the accessory socket provided in the vehicle but also in the accessory socket provided in the battery-mounted power generation device. Therefore, even when the power generation device is started in the storage battery exclusion state, it is desirable to prevent supply of high peak voltage to the accessory socket.

JP, 2009-023421, A

  Japanese Patent Laid-Open No. 2009-023421 (Document 1) discloses a power supply control device that provides a switch between a power supply and an accessory socket and turns on / off the power supply to the accessory socket according to the state of the vehicle. However, the power supply control device disclosed in Document 1 does not consider the case where the motor can be started in the storage battery exclusion state by only temporarily shutting off the power supply to the accessory socket when the motor is started. .

  The present invention has been made in view of the above problems, and prevents a voltage with a high peak value from being supplied to the accessory socket when the generator is started with the storage battery disconnected. The purpose is

  In order to achieve the above-mentioned object, according to a first aspect of the present invention, a power supply cutoff circuit specified in claim 1 is provided.

  According to the first aspect, when the generator is started with the storage battery disconnected, it is possible to prevent in advance that a voltage with a high peak value is supplied to the accessory socket.

  According to a second aspect of the present invention, there is provided a power supply cutoff circuit specified in claims 2 and 3.

  According to the second aspect, the connection state of the storage battery can be determined without using mechanical means.

  According to a third aspect of the present invention, there is provided a power supply cutoff circuit specified in claim 4.

  According to the third aspect, the power supply can be cut off when the high voltage is detected.

  According to a fourth aspect of the present invention, there is provided a power supply cutoff circuit specified in claim 5.

  According to the fourth aspect, the power supply can be prevented from being interrupted by noise such as an instantaneous pulse, and the power of the storage battery can be stably supplied to the accessory socket.

  According to a fifth aspect of the present invention, there is provided a power supply cutoff circuit specified in claim 6.

  According to the fifth aspect, the interruption of the power supply can be maintained when the high voltage is detected.

According to a sixth aspect of the present invention, there is provided a power supply cutoff circuit specified in claim 7.
According to the sixth aspect, in the vehicle, when the internal combustion engine is started with the storage battery not connected, power supply to the accessory socket can be cut off.

FIG. 1 is a side view of a motorcycle. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a block diagram showing the outline of the configuration of the power supply unit of the vehicle. FIG. 4 is a view showing an arrangement example of the accessory socket. FIG. 5 is a circuit diagram showing the configuration of the power supply cutoff circuit. FIG. 6 is a diagram showing the relationship between the input voltage, the on / off of the transistor, and the control signal. FIG. 7 is a diagram showing a relationship between an input voltage, a voltage of a capacitor and a control signal at the time of half wave rectified waveform input.

Hereinafter, a power supply cutoff circuit according to an embodiment of the present invention will be described in detail with reference to the drawings. The examples do not limit the present invention according to the claims, and all combinations of the configurations described in the examples are not necessarily essential to the solution of the present invention.
[Composition of a motorcycle]
FIG. 1 is a side view of a motorcycle. In the following description, when the traveling direction of the motorcycle is the front, and the reference numerals of mechanisms and configurations symmetrically provided one by one on the left and right are indicated by "L" indicating the left and "R" indicating the right. There is. The front portion and the rear portion of the vehicle body of the motorcycle 10 are connected via a low floor portion 14. The vehicle body frame is generally composed of a down tube 16 and a main pipe 17. A seat 18 is disposed above the main pipe 17.

  The steering wheel 21 is pivotally supported by the head pipe 15 and extends upward, and a front fork 22 for pivotally supporting the front wheel WF rotatably is attached to one lower side. A steering wheel cover 23 which doubles as an instrument panel is attached to an upper portion of the steering wheel 21. Further, in front of the head pipe 15, a control unit 30 having an engine start control function and a charge control function is disposed.

A hanger bracket 28 of the swing unit 20 is swingably supported via a link member 26 on a bracket 25 protruding from the rear end of the down tube 16 and the rising portion of the main pipe 17. At the front of the swing unit 20, for example, a 4-cycle single-cylinder motor E is disposed. A continuously variable transmission 31 is disposed behind the motor E, and a rear wheel WR is pivotally supported by an output shaft of the reduction mechanism 19. A rear shock unit 13 is interposed between the upper end of the reduction gear mechanism 19 and the bent portion of the main pipe 17. Above the swing unit 20, a throttle body 32 and an air cleaner 24 of a fuel injection system connected to an intake pipe 29 extending from an engine E, which is an internal combustion engine, are disposed.
Swing Unit FIG. 2 is a cross-sectional view taken along the line AA of FIG. The swing unit 20 has a crankcase 74 configured of a right case 75 on the right side in the vehicle width direction and a left case 76 on the left side in the vehicle width direction. The crankshaft 51 is rotatably supported by bearings 53 and 54 fixed to the crankcase 70. A connecting rod 73 is connected to the crankshaft 51 via a crank pin 52.

  The left case 76 also serves as a transmission chamber case, and a belt drive pulley consisting of a movable pulley half 60 and a fixed pulley half 61 is attached to the left end of the crankshaft 51. The stationary pulley half 61 is fastened to the left end of the crankshaft 51 by a nut 77. The movable pulley half 60 is spline-fitted to the crankshaft 51 so as to be axially slidable. A V-belt 62 is wound between the two pulley halves 60 and 61.

  A lamp plate 57 is fixed to the crankshaft 51 on the right side of the movable pulley half 60. The slide piece 58 attached to the outer peripheral end of the ramp plate 57 is engaged with the ramp plate sliding boss 59 formed at the outer peripheral end of the movable pulley half 60 in the axial direction. Further, a tapered surface is formed on the outer peripheral portion of the ramp plate 57 so as to incline toward the movable pulley half 60 as it goes radially outward, and between the tapered surface and the movable pulley half 60 A plurality of weight rollers 63 are accommodated in the housing.

  When the rotational speed of the crankshaft 51 is increased, the weight roller 63 is moved radially outward by the centrifugal force. As a result, the movable pulley half 60 moves to the left in the figure and approaches the fixed pulley half 61, and as a result, the V-belt 62 sandwiched between the two pulley halves 60, 61 moves radially outward. It moves and its winding diameter becomes large.

  On the rear side of the swing unit 20, there is provided a driven pulley (not shown) in which the winding diameter of the V-belt 62 is changed corresponding to the two pulley halves 60, 61. The driving force of the motor E is automatically adjusted by the above-mentioned belt transmission mechanism, and is transmitted to the rear wheel WR via a centrifugal clutch and a reduction gear mechanism 19 (see FIG. 1) not shown.

  An AC generator (ACG) starter motor 70 is disposed in the right case 75. The ACG starter motor 70 has an outer rotor (rotor) 71 fixed to a tapered end portion of a crankshaft 51 by a mounting bolt 81 and a stator disposed inside the outer rotor 71 and fixed to a right case 75 by a mounting bolt 82. (Stator) 72 is comprised. A radiator 68 and a cover member 69 having a plurality of slits are attached to the right side of the blower fan 65 fixed to the outer rotor 71 by the mounting bolt 67, as shown.

  A sprocket 55 is fixed between the ACG starter motor 70 and the bearing 54 and on which a cam chain for driving a cam shaft (not shown) is wound. The sprocket 55 is integrally formed with a gear 56 for transmitting power to an oil pump (not shown) for circulating engine oil.

Further, the outer rotor 71 of the ACG starter motor 70 can be rotated manually by using the kick pedal 33 shown in FIG. In other words, the motor E can be started by rotating the outer rotor 71 by the kick pedal 33. That is, the prime mover E is a prime mover that can be started by externally applied thrust, and the ACG starter motor 70 that generates electric power by rotation of the prime mover E is a generator that can be started by externally applied thrust.
[Configuration of power supply unit]
The outline of the configuration of the power supply unit of the vehicle is shown by the block diagram of FIG. The electrode U of the generator 101 is connected to the positive electrode of the storage battery 106 through the thyristor 104, the negative electrode of the storage battery 106 is connected to the potential of the vehicle body, in other words, the negative electrode of the storage battery 106 is grounded, and the generator It is connected to an electrode V of 101. Therefore, when the gate signal is applied to the thyristor 104, the storage battery 106 is charged by the output of the generator 101 half-wave rectified by the thyristor 104, and the power generated by the generator 101 is stored in the storage battery 106.

  Also, the electrode V of the generator 101 is connected to the electrode U of the generator 101 via the lamp 102 for the headlight and the thyristor 103. Therefore, when the gate signal is applied to the thyristor 103, the lamp 102 is lit by the output of the generator 101 half-wave rectified by the thyristor 103.

The headlight / charge control circuit 105 which is a part of the control unit 30 shown in FIG. 1 turns on and off the gate signal of the thyristor 104 according to the voltage V _B of the storage battery 106 to control charging of the storage battery 106 and the headlight. Perform lighting control of. In addition, the storage battery 106 is removably installed from the vehicle body for maintenance and replacement.

  The positive electrode of the storage battery 106 is connected to the positive voltage terminal of the accessory socket 109 via a diode 107 for backflow prevention and a power shutoff circuit 108 described later. The negative voltage terminal of the accessory socket 109 is grounded. This connection enables the supply of 12 volt (12 V) power to the external device through the accessory socket 109. The accessory socket 109 may be traditionally referred to as a "cigar / cigarette lighter receptacle".

  An arrangement example of the accessory socket 109 is shown in FIG. The accessory socket 109 is disposed, for example, in a trunk below the seat 18 covered by the lid 110. When the lid 110 is opened, the accessory socket 109 is exposed. The arrangement of the accessory socket 109 is not limited to that of FIG. 4 and may be arranged at another position.

Although the example which applies the power-supply cutoff circuit 108 of this invention to the power supply part of vehicles, such as a two-wheeled motor vehicle, is shown in FIGS. 1-4, the power-supply cutoff circuit 108 of this invention is applied also to the storage apparatus of a battery mounting type It is possible.
[Power shutoff circuit]
In the power supply cutoff circuit 108, the connection state detection unit 181 determines the connection state of the storage battery 106 based on the voltage of the line connecting the diode 107 for backflow prevention and the positive voltage terminal of the accessory socket 109 (hereinafter referred to as "input voltage Vin"). To detect Detection state holding unit 182 has a function of maintaining the open state of open / close unit 185 described later when the non-connected state of storage battery 106 described later is detected. The upper limit voltage detection unit 183 detects an input voltage Vin equal to or higher than a predetermined value. The control unit 184 outputs a control signal Vsw of the open / close unit 185 based on the outputs of the connection state detection unit 181, the detection state holding unit 182, and the upper limit voltage detection unit 183.

A switch 185 disposed between the storage battery and the accessory socket 109 opens and closes an electrical connection between the storage battery and the positive voltage terminal of the accessory socket 109. When the non-connected state of storage battery 106 is not detected and input voltage Vin equal to or higher than the predetermined value is not detected, control unit 184 outputs control signal Vsw for closing open / close unit 185. In addition, when the non-connection state of storage battery 106 is detected, or when the input voltage Vin equal to or higher than a predetermined value is detected, control unit 184 outputs control signal Vsw to open / close switch 185. Therefore, detection of disconnection of storage battery 106 or detection of input voltage Vin equal to or higher than a predetermined value causes switching circuit 185 to cut off the electrical connection between diode 107 for backflow prevention and the positive voltage terminal of accessory socket 109. Ru. The open state is a cutoff state, and the closed state is a connection state.
Circuit Configuration In the following description, it is assumed that the forward voltage V _F of the diode and the voltage V _BE between the base and the emitter of the transistor are “0.6 V”. However, in practical device design, voltage values are used depending on the characteristics of the individual elements and their operating conditions. Also, the resistance value of the resistor that constitutes the circuit, the capacitance value of the capacitor, and the Zener voltage of the Zener diode may be described in the drawings as reference values. However, in an actual device, a value that can obtain an appropriate circuit operation should be used, and is not limited to the reference value described in the drawings. In the power supply unit, fuses for safety and surge absorbers such as varistors are provided to protect various circuits from surges and malfunction, but these protective elements are not directly related to the present invention, The description and description of these protective elements are omitted.

The configuration of the power shutoff circuit 108 is shown by the circuit diagram of FIG. In the connection state detection unit 181, the zener diode D1 is when the input voltage Vin is lower than the Zener voltage Vz _D1 is non-conducting, Vin becomes possible conductive state to become more Vz _D1. When the diode D1 becomes conductive and the base-emitter voltage V _{BE of the} NPN transistor Q1 exceeds 0.6 V, the base-emitter of the transistor Q1 (hereinafter referred to as "BE") via the zener diode D1 and the resistor R1. ) to the base current I _B1 flows between the collector and the emitter of the transistor Q1 ( "inter-CE" hereinafter) is changed to the conduction (Q1 on) from a non-conducting (Q1 off).

If the register R2 is Vin is lower than the Zener voltage Vz _D1, which stabilizes the base of Q1 to the emitter potential, is intended for maintaining the off state of the transistor Q1, for example, the Zener voltage Vz _D1, the threshold voltage Vth1 = Vz a _D1 + V _bE, Q1 off at Vin <Vth1, a Q1 on in Vin ≧ Vth1. The capacitor C1 is for noise removal.

A charge according to the input voltage Vin is accumulated in the capacitor C2 of the detection state maintaining unit 182 via the diode D2. A capacitor having a relatively large capacitance is used as the capacitor C2, and a voltage corresponding to the peak value of the input voltage Vin is held in the capacitor C2. Hereinafter, the voltage is referred to as a voltage V _C2 held by the capacitor C2.

Even if the input voltage Vin includes an instantaneous pulse, the energy of the instantaneous pulse is smoothed by the capacitor C2 having a relatively large capacitance, and the fluctuation of the voltage V _C2 does not occur due to the influence of the instantaneous pulse.

The connection point of the diode D2 and the capacitor C2 is connected to the anode of the diode D5 and the collector of the transistor Q1 via the resistor R3. When Q1 is on, the charge stored in the capacitor C2 flows as a collector current I _C1 between CE of the transistor Q1 via the resistor R3. On the other hand, when Q1 is off, the charge stored in capacitor C2 flows through resistor R3, diode D5 and resistor R4 to resistor R5, and when the base-emitter voltage of Q2 exceeds 0.6 V, BE of NPN transistor Q2 flows as the base current I _B2 between, between the transistor Q2 CE is shifted to the conduction (Q2 oN) from non-conductive (Q2 off).

  When the storage battery 106 charged to start the prime mover (or the generator) is in the connected state, the input voltage Vin is within the normal fluctuation range of the terminal voltage of the storage battery 106 (even if there is a pulsating flow due to the charging of the storage battery 106 For example, 10V to 13.5V). Hereinafter, a voltage waveform of Vin in a normal fluctuation range (including a pulsating current component) of the terminal voltage of the storage battery 106 will be referred to as a “DC waveform (DC waveform)”. Under the condition that a DC waveform is observed as a voltage waveform of Vin, the voltage of Vin does not decrease to a voltage at which Q1 turns off, and Q1 turns on.

  On the other hand, when the storage battery 106 is in the non-connected state, a voltage of a waveform obtained by half-wave rectifying the output of the generator 101 (hereinafter, “half-wave rectified waveform”) is supplied to the power shutoff circuit 108 as Vin. Therefore, due to the fluctuation of the input voltage Vin, a period (a detection period of a non-DC waveform) in which Vin becomes a voltage at which Q1 is turned off occurs.

  Hereinafter, a signal input to the base of the transistor Q2 from the connection state detection unit 181 via the resistor R4 according to the on / off of the transistor Q1 will be referred to as a "first detection signal". The value '0' of the first detection signal at the time of Q1 ON indicates' detection of DC waveform (connection state of storage battery) ', the value' 1 'of the first detection signal at the time of Q1 OFF is' non DC waveform ( “Detection of disconnected state of storage battery”.

In the upper limit voltage detection unit 183, the Zener diode D3 is non-conductive (D3 off) when Vin is less than the Zener voltage Vz _D3 and can be conductive (D3 on) when Vin is Vz _D3 or more. In D3 on, sum of BE voltage V _BE of the forward voltage V _F and the transistor Q2 of the diode D4 for preventing back flow, when the Vin increases further, the transistor Q2 through a diode D4 and resistor R4 for backflow prevention The base current I _B2 flows between the BEs, and a transition from Q2 off to Q2 on is made.

For example, if the Zener voltage Vz _D3, a threshold voltage _{Vth2 = Vz D3 + V F +} V BE, is Q2 on in Q2 off, Vin ≧ Vth2 at Vin <Vth2. The resistor R5 is for stabilizing the base of Q2 at the emitter potential and maintaining the off state of Q2 when detecting a DC waveform where Vin is equal to or higher than the Zener voltage Vz _D1 and less than Vz _D3. , R 4 also function as a filter for removing noise such as instantaneous pulses.

  Hereinafter, a signal input from upper limit voltage detection unit 183 to the base of transistor Q2 via resistor R4 will be referred to as a "second detection signal". The value '0' of the second detection signal at the time of D3 OFF indicates “detection of the input voltage Vin less than the upper limit value Vth2”, and the value '1' of the second detection signal at the time of D3 ON is “the upper limit value Vth2 or more Detection of the input voltage Vin.

  The diode D5 for backflow prevention of the connection state detection unit 181 and the diode D4 for backflow prevention of the upper limit voltage detection unit 183 form a logical OR circuit, and the first detection signal and the second detection signal are ORed Is input to the base of the transistor Q2.

In the control unit 184, the resistor R7, the zener diode D6, and the capacitor C5 form a shunt regulator, and generate a voltage corresponding to the control signal Vsw for closing the open / close unit 185 from the input voltage Vin. The capacitor C5 is for smoothing, and a capacitor having a relatively large electrostatic capacitance is used as the capacitor C5. When Q2 is off, the voltage generated by the shunt regulator is supplied to the switch 185 as the control signal Vsw.
Operation at DC Input FIG. 6 shows the relationship between the input voltage Vin, the on / off of the transistors Q1 and Q2, and the control signal Vsw. Note that FIG. 6 shows an example of the voltage value and a state in which the input voltage Vin is linearly increased in order to facilitate the description.

  When Vin <Vth1, Q1 is off, and the connection state detection unit 181 outputs a first detection signal (value “1”) indicating “detection of non-DC waveform (storage battery non-connection state)”. In addition, the upper limit voltage detection unit 183 outputs a second detection signal (value “0”) indicating “detection of the input voltage Vin less than the upper limit value Vth2”. Therefore, Q2 is on, and a control signal Vsw (hereinafter referred to as "open signal") indicating the open state of the open / close unit 185 is output from the control unit 184, and the open / close unit 185 is open.

  Q1 is on in Vth1 ≦ Vin <Vth2, and the connection state detection unit 181 outputs a first detection signal (value “0”) indicating “detection of DC waveform (connection state of storage battery)”. In addition, the upper limit voltage detection unit 183 outputs a second detection signal (value “0”) indicating “detection of the input voltage Vin less than the upper limit value Vth2”. Therefore, Q2 is off, and the control unit 184 outputs a control signal Vsw (hereinafter referred to as “close signal”) indicating the closed state of the open / close unit 185, and the open / close unit 185 is closed.

Q1 is on when Vin ≧ Vth2, and the connection state detection unit 181 outputs a first detection signal (value “0”) indicating “detection of DC waveform (connection state of storage battery)”. Further, the upper limit voltage detection unit 183 outputs a second detection signal (value '1') indicating “detection of the input voltage Vin higher than or equal to the upper limit value Vth2”. Therefore, Q2 is on, and an open signal is output from the control unit 184, and the open / close unit 185 is opened.
Operation at Half Wave Rectified Waveform Input The DC operation of the power supply cutoff circuit 108 has been described with reference to FIG. When storage battery 106 is in a disconnected state, a voltage having a half-wave rectified waveform is supplied to power supply cutoff circuit 108 as Vin. In this case, charge and discharge of the voltage V _C2 occurs, and the operation of the power supply cutoff circuit 108 changes. Assuming that t = 0 when the input voltage Vin reaches the peak value, the voltage V _C2 exhibits an exponential decrease shown by the following equation as time t elapses.
V _C2 (t) = V _C20 exp (-t / τ)
Where V _C20 is the voltage at t = 0,
V _C2 (t) is the voltage at time t,
τ is a time constant.

FIG. 7 shows the relationship between the input voltage Vin, the voltage V _C2 and the control signal Vsw at the time of half wave rectified waveform input. Note that FIG. 7 shows an example of the voltage value and one cycle of the half-wave rectified waveform is 60 ms (corresponding to the number of revolutions of the generator 101 of 1,000 rpm) in order to simplify the description. Indicates

When the second detection signal (value '1') indicating “detection of the input voltage Vin higher than the upper limit value Vth2” is output from the upper limit voltage detection unit 183, the time constant τ in the above equation is expressed by C2 × R4 Ru. The voltage V _C2 (t) shown in FIG. 7 shows a change when the time constant τ = 100 ms.

  During a period in which the input voltage Vin rises from 0 V to Vth1, Q1 is off and Q2 is on, and the switch 185 is in an open state. When the input voltage Vin exceeds Vth1, the transition from Q1 OFF to Q1 ON, transition from Q2 ON to Q2 OFF, and the switch 185 is closed. When the input voltage Vin further rises and exceeds Vth2, D3 is turned on, transitioning from Q2 off to Q2 on, the switching unit 185 is opened.

After the input voltage Vin passes the peak value, the voltage V _C2 (t) decreases, but the voltage V _C2 (t) recovers to V _C20 by the input of the half-wave rectified waveform of the next cycle, and D3 remains on Be done. Therefore, Q2 ON and the open state of the open / close unit 185 are also maintained.

  As described above, the power supply cutoff circuit 108 determines the connection state of the storage battery 106 based on the voltage Vin of the line that supplies power from the storage battery side to the accessory socket 109. Then, based on the determination result, the storage battery side controls the opening and closing of the electrical connection between the line for supplying power to the accessory socket 109 and the accessory socket 109.

The determination of the connection state of the storage battery 106 is performed by detecting whether or not the voltage waveform of the input voltage Vin is a DC waveform. When an instantaneous value less than the first predetermined value is detected as input voltage Vin, storage battery 106 is determined to be in a non-connected state. The first predetermined value is Vth1 = Vz _D1 + V _BE. When an instantaneous value equal to or greater than a second predetermined value is detected as input voltage Vin, storage battery 106 is determined to be in a disconnected state. The second predetermined value is _{Vth2 = Vz D3 + V F +} V BE.

If it is determined that storage battery 106 is in the non-connected state, power shutoff circuit 108 cuts off the electrical connection between the line for supplying power from accessory battery side to accessory socket 109 and accessory socket 109. Therefore, when the prime mover or the power generation device is started with the storage battery 106 removed, supply of high peak voltage to the accessory socket 109 can be prevented in advance.
[Modification]
In the above, as the state of the storage battery 106, two states of the connected state and the non-connected state have been described. However, even if the storage battery 106 is in the connected state, when the storage battery 106 is deteriorated and the internal resistance is increased, a large fluctuation occurs in the input voltage Vin. In this case, the input voltage Vin does not decrease to 0 V unlike the half-wave rectified waveform, but may exhibit a pulsating current waveform falling to, for example, several V (> 0). Even in such a case, the power supply shutoff circuit 108 can detect an abnormality of the storage battery 106 and shut off the power supply to the accessory socket 109.
Moreover, in the above, the description has been made on the assumption that a lead storage battery (2 V cell × 6) with a nominal voltage of 12 V is used as the storage battery 106. As storage batteries that can be used for vehicles and power generation devices, there are lead storage batteries with a nominal voltage of 6V, series connection (24V) of lead storage batteries with a nominal voltage of 12V, alkaline storage batteries with a nominal voltage of 7.2V (1.2V cells x 6 cells), etc. . Those skilled in the art can easily apply the present invention to vehicles and power generators equipped with such storage batteries, and such vehicles and power generators are also included in the scope of the present invention.

Claims (6)

The generator (101) can be started by an externally applied thrust, the storage battery (106) used for starting the generator, and storing the power generated by the generator, and the power of the storage battery In a power supply apparatus having an accessory socket (109) used to supply equipment, between a line and the storage battery based on a voltage (Vin) of the line used to supply power from the storage battery side to the accessory socket Detection means (181, 183) for detecting the connection state of
A switch (185) for switching the electrical connection between the line and the accessory socket to an open or closed state;
When the connection state of the line and the storage battery is detected, the opening / closing unit (185) is closed, and when the connection state of the line and the storage battery is detected, the opening / closing unit (185) is opened. Control means (184) for controlling so that
The detection means is a first detection means (181) for outputting a first detection signal indicating a connection state or a non-connection state of the storage battery, and a comparison between an input voltage (Vin) of the storage battery and a threshold (Vth2) And second detection means (183) for outputting a second detection signal indicating a result;
When the first detection signal indicates the non-connection state of the storage battery and the second detection signal indicates the input voltage less than the threshold, the control means opens the switching unit;
When the first detection signal indicates the connection state of the storage battery and the second detection signal indicates an input voltage less than the threshold value, the switching unit is closed.
A power supply shutoff circuit characterized in that when the first detection signal indicates a connection state of the storage battery and the second detection signal indicates an input voltage equal to or higher than the threshold value, the open / close unit is opened . Said first detection means (181) is a voltage waveform of the line to test knowledge,
If the first of the line voltage waveform different from the current waveform by detecting means is detected, the control unit may power according to claim 1, characterized in that said closing portion (185) in the open state Cut off circuit. Said first detection means (181), the voltage value of the line (Vin) to search known,
If the voltage value of the first predetermined value (Vth 1) less than the line is detected by said first detection means, the control means is characterized in that said closing portion (185) in the open state The power supply cutoff circuit according to claim 1. Said second detecting means (183), the voltage value of the line (Vin) to search known,
If the voltage value of the second predetermined value (Vth 2) or more of the lines as the threshold value by said second detection means is detected, the control means, to said closing portion (185) in the open state The power supply cutoff circuit according to claim 1, characterized in that   The power supply cutoff according to claim 4, further comprising supply means (182) for supplying a voltage value representing a peak value of the voltage of the line as the voltage value of the line to the second detection means. circuit.   The power supply interrupting circuit according to any one of claims 1 to 5, wherein the power supply device is mounted on a vehicle (10) having an internal combustion engine (E).

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