JP2013118790A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device capable of preventing a battery from being wasted by a dark current, and capable of charging the battery even under a condition where a main switch is opened.SOLUTION: The power supply device includes a charge relay 20 in which a normally-opened contact point 20a is inserted between a battery 13 and an output terminal of a regulator 11A, and a charge relay control part 21 which includes a micro processor 21B that is driven by an output of a power supply circuit 21A into which an output of the regulator is inputted through a diode D1 and an output of the battery is inputted through a main switch 15 and a diode D2, and controls the charge relay so that the charge relay is magnetized to turn on the normally-opened contact point 20a when the battery 13 is correctly oriented and the main switch 15 is closed, and the charge relay is demagnetized to turn off the normally-opened contact point 20a when the main switch is opened, and the main switch is closed but the battery is oriented opposite to the correct orientation.

Description

  The present invention relates to a power supply device including an AC generator driven by an engine or the like and a battery charged by the output of the AC generator.

  The battery is charged with a DC voltage obtained by rectifying the output of the AC generator driven by the engine as a power supply device mounted on a vehicle driven by the engine, etc. Is used. As shown in FIG. 7 or FIG. 8, this type of power supply apparatus 1 is input through AC input terminals 1u and 1v, positive and negative DC output terminals 1a and 1b, and AC input terminals 1u and 1v. And a regulator 1A with a rectifying function that rectifies the AC voltage and outputs a DC voltage whose voltage value is adjusted between the DC output terminals 1a and 1b, and between the AC input terminals 1u and 1v. Output voltage is input. A DC voltage obtained between the DC output terminals 1 a and 1 b is applied to the battery 3 and a load 4 provided in parallel to the battery 3. A main switch 5 that is closed when the load 4 is driven is provided between the battery 3 and the load 4.

  When using this type of power supply device, as shown in FIG. 7, a battery 3 is connected between the DC output terminals 1a and 1b without a switch, and both ends of the battery 3 are connected via a main switch 5. When the load 4 is connected, and as shown in FIG. 8, the load 4 is connected between the DC output terminals 1a and 1b without a switch, and the battery 3 is connected to both ends of the load 4 via the main switch 5. May be configured to connect. 7 and 8, reference numeral 6 denotes a fuse connected in series with the battery 3. The configuration shown in FIG. 7 is shown, for example, in Patent Document 1, and the configuration shown in FIG. 8 is shown, for example, in Patent Document 2.

JP-A-11-89111 JP 2011-50218 A

  As shown in FIG. 7, when the battery 3 is connected between the DC output terminals 1a and 1b and the load 4 is connected to both ends of the battery 3 via the main switch 5, the engine is operated. The battery 3 can be charged regardless of the state of the main switch 5 when the engine is stopped, but when the engine is stopped and the main switch 5 is opened, the regulator 1A There was a problem of dark current flowing through the circuit inside.

  In general, the regulator 1A detects the battery voltage and performs an operation of adjusting the output voltage so that the detected battery voltage does not exceed the set value. Therefore, the regulator 1A is connected in parallel to the battery to detect the battery voltage. The voltage detection circuit is provided. The voltage detection circuit is usually composed of a resistance voltage dividing circuit and has a high impedance, but it cannot be avoided that a dark current flows through the detection circuit. Therefore, when the configuration shown in FIG. 7 is adopted, there is a problem that the battery 3 is consumed if the engine is stopped for a long period of time, for example, when storing equipment or facilities equipped with the power supply device 1. .

  As shown in FIG. 8, when the load 4 is connected between the DC output terminals 1a and 1b and the battery 3 is connected to both ends of the load 4 via the main switch 5, the engine stops. Since the battery 3 is disconnected from the regulator 1 when the main switch 5 is open, there arises a problem that when the engine is stopped, a dark current flows from the battery 3 through a circuit in the regulator 1 and the battery is consumed. There is nothing. However, in the case of the configuration shown in FIG. 8, if the main switch 5 is opened to stop the driving of the load 4, sufficient power is supplied for the AC generator 2 to charge the battery 3. Even if it occurs, since the battery 3 cannot be charged, there arises a problem that the battery is insufficiently charged when the main switch is open for a long time.

  It is an object of the present invention to prevent a dark current from flowing from a battery to a regulator when the engine has been stopped for a long period of time, and to prevent the battery from being consumed, and to stop driving a load. It is an object of the present invention to provide a power supply device that can charge a battery even when the AC generator is open as long as the AC generator generates a sufficient output.

  The present invention rectifies the AC voltage input through the AC input terminal to which the output of the AC generator driven by the engine is input, the DC output terminal on the positive electrode side and the negative electrode side, and the AC input terminal to obtain a voltage value. A power supply body having a regulator that outputs the regulated DC voltage between the DC output terminals, and a DC voltage obtained between the DC output terminals of the power supply body is provided in parallel with the battery It is intended for a power supply device that is supplied to a load and in which a main switch is inserted between a positive electrode terminal of the battery and one end of the load.

  A power supply device according to the present invention has a normally open contact, and the normally open contact is inserted in series in a circuit that connects between a positive side DC output terminal and a positive terminal of a battery, and a regulator Output voltage of the battery is input through the first diode and the output voltage of the battery is input through the main switch and the second diode to convert the input voltage into a stabilized DC voltage. A stabilized DC voltage output from the control power supply circuit is input to the power supply terminal, and a microprocessor that starts when the stabilized DC voltage is established; and when a relay drive command is given Energize the charging relay and detect the voltage of the battery through the relay drive circuit that demagnetizes the charging relay when the relay drive command is extinguished and the main switch. A first signal is generated when the orientation of the battery is correct and the main switch is closed. When the main switch is open and when the main switch is closed, the battery is in the opposite direction. And a switch state detection circuit for generating a second signal.

  The microprocessor generates a relay drive command when the switch state detection circuit is generating the first signal, and extinguishes the relay drive command when the switch state detection circuit is generating the second signal It is programmed to constitute relay drive command generation means. The regulator is configured to immediately output a DC voltage when the AC generator generates an output.

  With the above configuration, when the engine is stopped and the main switch is opened, the control power supply circuit does not generate an output voltage, and the microprocessor does not operate, so no relay drive command is generated, The normally open contact of the charging relay is kept off. Therefore, when the engine is stopped and the main switch is opened, the battery can be disconnected from the regulator, and when the equipment and facilities equipped with the power supply are stopped or stored for a long time. In addition, it is possible to prevent the battery from being consumed due to the dark current flowing from the battery to the regulator.

  Also, when the engine is running and the AC generator is generating voltage, the power supply of the microprocessor is secured by the output of the regulator and the relay drive command continues to be generated, so the charging relay contact is kept on. Is done. Therefore, even when the main switch is opened to stop driving the load, the battery can be charged if the engine is running and the alternator generates sufficient output. Even if the battery is opened for a long time, the battery will not be under charged.

  As described above, when the battery voltage is detected through the main switch so as to detect the state of the main switch, the main switch is closed when the battery is erroneously connected at the end of the maintenance or the like. However, since the signal (first signal) indicating that the main switch is closed is not output, the microprocessor does not generate a relay drive command. Therefore, when the battery is connected in the reverse direction, it is possible to prevent the voltage of the battery from being applied to the regulator and destroying the regulator.

  In one aspect of the present invention, the battery charging mode is a first mode in which the battery is charged only when the main switch is closed, and the engine speed is equal to or higher than the set speed even when the main switch is open. Charging mode setting means for setting to the second mode for charging the battery is further provided. In this case, the microprocessor has a rotation speed detection means for detecting the rotation speed of the engine from the output of the AC generator, the switch state detection circuit is generating the first signal, and the charging mode is the second mode. A relay drive command is generated when the switch state detection circuit generates the second signal in the state where the engine speed is set and the engine speed is detected to be equal to or higher than the set speed by the rotation speed detection means. The switch state detection circuit generates the second signal when the charge mode is set to the first mode and when the charge mode is set to the second mode. Is generating the second signal and it is detected by the rotational speed detecting means that the rotational speed of the engine is less than the set speed or the engine is stopped. Is programmed to configure a relay driving command generating means to extinguish the relay driving command when it is issued.

  If comprised as mentioned above, when it is requested | required to have the function to charge a battery even in the state where the main switch is open, the request | requirement can be met.

  In a preferred aspect of the present invention, a voltage detection circuit for detecting the voltage of the battery and / or the output voltage of the regulator is provided, and the microprocessor determines whether the regulator and the battery are abnormal from the voltage detected by the voltage detection circuit. It is programmed to constitute a failure diagnosis means for diagnosing the above. In this case, the relay drive command generation means is configured to perform processing for storing the diagnosis result by the failure diagnosis means in the memory before stopping the output of the relay drive command.

  As described above, a voltage detection circuit for detecting the voltage of the battery and / or the output voltage of the regulator is provided, and a failure for diagnosing whether there is an abnormality in the regulator and the battery from the voltage detected by the voltage detection circuit If the microprocessor is programmed to configure the diagnostic means, it is diagnosed whether the battery has deteriorated from the voltage detected by the voltage detection circuit, or whether the regulator is abnormal. be able to. Further, as described above, if the relay drive command generating means is configured to store the diagnosis result by the failure diagnosis means in the memory before stopping the output of the relay drive command, the diagnosis result is stored in the memory. Therefore, information for properly performing maintenance can be provided to the user.

  In another aspect of the present invention, a third diode having an anode connected to the positive terminal of the battery through the main switch is provided, and the voltage of the battery is input to the relay drive circuit through the main switch and the third diode. . In this case, the relay drive circuit is configured to supply an excitation current to the charging relay even when the main switch is closed and the output voltage of the battery is input through the third diode and the main switch.

  With the above configuration, when the main switch is closed, the contact of the charging relay can be turned on even if no relay drive command is issued from the microprocessor. Even if it happens, or even if it does not happen to start, the contact of the charging relay can be turned on to drive the load or to charge the battery.

  According to the present invention, when the engine is stopped and the main switch is opened, the contact of the charging relay inserted between the regulator and the battery can be held in the off state, so that the engine is stopped. And the battery can be disconnected from the regulator when the main switch is open. Therefore, when a device or facility equipped with the power supply device is stopped or stored for a long time, it is possible to prevent the battery from being consumed due to dark current flowing from the battery to the regulator.

  Further, according to the present invention, when the engine is rotating and the alternator is generating a voltage, the power of the microprocessor can be secured by the output of the regulator and the relay drive command can be continuously generated. Thereby, the contact of a charging relay can be hold | maintained in an ON state. Therefore, even when the main switch is opened to stop driving the load, the battery can be charged if the engine is running and the alternator generates sufficient output. When the battery is opened for a long time, it is possible to prevent the battery from being insufficiently charged.

  According to the present invention, since the state of the main switch is detected by detecting the battery voltage through the main switch, the main switch is closed when the battery is mistakenly connected at the end of the maintenance or the like. However, it can be prevented that the main switch is closed. This prevents the microprocessor from generating a relay drive command when the battery is reversely connected, so that when the battery is reversely connected, the battery voltage is applied to the regulator and the regulator is destroyed. Can be prevented.

  In the present invention, the battery charging mode includes the first mode in which the battery is charged only when the main switch is closed, and the battery when the engine speed is equal to or higher than the set speed even when the main switch is open. The charging mode setting means for setting the second mode for charging is provided, the rotational speed detecting means for detecting the rotational speed of the engine from the output of the AC generator, and the switch state detection circuit generates the first signal. The switch state detection circuit generates the second signal when the charging mode is set to the second mode, and the engine speed is higher than the set speed by the rotation speed detecting means. A relay drive command is generated when the switch is detected, and the switch state detection circuit is set to the second state while the charge mode is set to the first mode. The switch state detection circuit generates the second signal when the charging mode is set to the second mode and the engine speed is less than the set speed by the rotation speed detecting means. When the microprocessor is programmed to constitute a relay drive command generating means for eliminating the relay drive command when it is detected that the engine is stopped or when the engine is stopped, the main switch When the battery is required to be charged even when the battery is open, the request can be met.

  In the present invention, a charge relay is also provided when a third diode whose anode is connected to the positive terminal of the battery through the main switch is provided and the voltage of the battery is input to the relay drive circuit through the main switch and the third diode. When the main switch is closed, the charging relay contacts can be turned on even when no relay drive command is generated from the microprocessor when the main switch is closed. Even when the microprocessor does not start up or the switch state detection circuit is out of order, the contact of the charging relay can be turned on to drive the load or charge the battery.

It is the circuit diagram which showed the structure of one Embodiment of this invention. It is the block diagram which showed the structure of embodiment shown in FIG. It is the flowchart which showed an example of the algorithm of the main routine which a microprocessor performs in embodiment of this invention. 5 is a flowchart illustrating an example of an algorithm of a rotational speed calculation process executed by a microprocessor in the embodiment of the present invention. 5 is a flowchart illustrating an example of an algorithm of a charging relay ON determination process executed by a microprocessor in the embodiment of the present invention. 5 is a flowchart illustrating an example of an algorithm for a charging relay OFF determination process executed by a microprocessor in the embodiment of the present invention. It is the circuit diagram which showed roughly the example of 1 structure of the conventional power supply device. It is the circuit diagram which showed schematically the other structural example of the conventional power supply device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 and 2 show the configuration of an embodiment of the present invention. In these drawings, 11 is a power supply unit body, 12 is an AC generator driven by an engine 10 (see FIG. 2), and 13 is A battery, 14 is a load provided in parallel to the battery 13, 15 is a main switch, and 16 is a fuse connected in series to the battery 13.

  The power supply main body 11 includes AC input terminals 11u and 11v to which an output of the AC generator 12 is input, positive and negative DC output terminals 11a and 11b, a pair of relay coil connection terminals 11d and 11e, and detection A voltage input terminal 11f and a regulator 11A having a rectifying function for rectifying an AC voltage input through the AC input terminals 11u and 11v and outputting a DC voltage whose voltage value is adjusted between the DC output terminals 11a and 11b are provided. ing. A DC voltage obtained between the DC output terminals 11a and 11b of the power supply main body 11 is supplied to the battery 13 and a load 14 provided in parallel to the battery. In the present embodiment, the main switch 15 is inserted between the positive terminal of the battery 13 and one end of the load 14.

  In the present embodiment, the normally open contact 20a of the charging relay 20 is inserted in series in the circuit connecting the positive-side DC output terminal 11a of the power supply main body 11 and the battery 13, and the charging relay 20 is controlled in order to control the charging relay 20. A charging relay control unit 21 is provided in the power supply device body 11 together with the regulator 11A.

  In the illustrated example, one end of the contact 20 a of the charging relay is connected to the positive side DC output terminal 11 a of the power supply main body, and the other end of the contact 20 a is connected to the positive terminal of the battery 13 through the fuse 16. One end of the main switch 15 that is closed when the load 14 is driven is connected to a connection point between the fuse 16 and the other end of the contact 20 a, and the other end of the main switch 15 is connected to one end of the load 14. The other end of the load 14 is connected to the negative electrode side DC output terminal 11 b of the power supply main body 11 together with the negative electrode terminal of the battery 13 and is grounded. A connection point between one end of the load 14 and the main switch 15 is connected to the detection voltage input terminal 11f.

  In the present embodiment, the main switch 15 is incorporated in a key switch that is operated when the engine is operated, and the main switch 15 is operated when the key is operated in one step from the OFF position in one direction (up to the load driving position). Is closed and the main switch 15 is opened by returning the key to the OFF position. Further, after the main switch 15 is closed by operating the key from the off position to the load drive position, the starter motor starts the engine when the key is operated to a position exceeding the load drive position against the biasing force of the return spring. When the key is released after the engine is started, the key returns to the position where the main switch 15 is kept on by the biasing force of the return spring. In the present embodiment, the power supply device body 11, the main switch 15, and the charging relay 20 constitute a power supply device. Hereinafter, each part of the power supply device will be described in detail.

  The AC generator 12 is composed of a magnet type AC generator whose rotor is driven by the crankshaft of the engine. In the present embodiment, the AC generator 12 has a single-phase generator coil L, and an AC voltage induced in the generator coil L is input between the AC input terminals 11 u and 11 v of the power supply device body 11.

  As the regulator 11A, a regulator configured to immediately output a DC voltage when the AC generator 12 generates an output is used. The regulator 11A used in the present embodiment is a full-bridge single-phase bridge full-wave rectifier circuit in which the upper arm of the bridge is configured by diodes Du and Dv, and the lower arm of the bridge is configured by diodes Dx and Dy. And a short-circuit rectifier 11A1 having a short-circuit thyristor Thx and Thy connected in reverse parallel to the diodes Dx and Dy constituting the lower side of the bridge, and a short circuit so that the output voltage of the rectifier 11A1 is kept below a set value. And a control circuit 11A2 for controlling the thyristors Thx and Thy.

  The control circuit 11A2 includes a voltage detection circuit that detects the output voltage of the regulator 11A (the output voltage of the rectifier 11A1) through a resistance voltage dividing circuit, and the output voltage of the regulator detected by the voltage detection circuit is the upper limit of the setting range. When the output value of the regulator falls below the set value that gives the lower limit of the setting range, a short-circuit thyristor Thx, Thy is supplied when a trigger signal is given to the gates of the short-circuiting thyristors Thx and Thy. Stop supplying the trigger signal to.

  When the output voltage of the regulator exceeds a set value that gives the upper limit of the set range and a trigger signal is given to the short-circuit thyristors Thx and Thy, a thyristor in which a forward voltage is applied between the anode and cathode of these thyristors Is turned on to constitute a circuit for short-circuiting the output of the AC generator 12 to lower the output voltage of the regulator 11A. When the thyristor Thx is turned on, a short circuit of the power generation coil L-thyristor Thx-diode Dy-power generation coil L is formed, and the output of one half cycle of the power generation coil is short-circuited. When the thyristor Thy is turned on, a short circuit of the power generation coil L-thyristor Thy-diode Dx-power generation coil L is formed, and the output of the other half cycle of the power generation coil is short-circuited. When the output voltage of the regulator falls below the set value that gives the lower limit of the set range, the supply of the trigger signal to the short-circuit thyristors Thx and Thy is stopped, so that the thyristor that was in the on state has its anode current less than the holding current When it becomes, it turns off. With these operations, the DC voltage supplied from the regulator 11A to the battery 13 is maintained within the set range.

  The charging relay control unit 21 shown in FIG. 1 includes a control power supply circuit 21A, a microprocessor 21B, a relay drive circuit 21C, a switch state detection circuit 21D, a waveform shaping circuit 21E, and a voltage detection circuit 21F. It has become.

  In the control power circuit 21A, the output voltage of the regulator 11A is input through the first diode D1, and the voltage of the battery 13 is input through the main switch 15 and the second diode D2, and the output voltage of the regulator 11A and ( Or) a circuit for converting the output voltage of the battery 13 into a stabilized DC voltage.

  As the control power supply circuit 21A, one having an arbitrary configuration can be used. However, the control power supply circuit used in the present embodiment has a first capacitor C1 and a second capacitor C2 that are grounded at one end. And a voltage regulator REG which converts the voltage across the first capacitor C1 into a stabilized constant voltage Vcc suitable as a power supply voltage for the microprocessor and applies it across the second capacitor C2. Yes. The voltage regulator REG charges the second capacitor C2 with the voltage across the first capacitor C1 when the voltage across the second capacitor C2 is less than the set value, and the voltage across the second capacitor C2. Is a known device having a function of stopping the charging of the capacitor C2 when it reaches a set value.

  The other end of the first capacitor C1 is connected to the cathode of the first diode D1 whose anode is connected to the positive side DC output terminal 11a of the power supply device body 11, and the output voltage of the regulator 11A is the first voltage. The voltage is input to the control power supply circuit 21A through the diode D1. Further, when the cathode of the second diode D2 having the anode connected to the detection voltage input terminal 11f is connected to the other end of the first capacitor C1, and the main switch 15 is closed, the voltage of the battery 13 is changed to the second voltage. Is input to the control power supply circuit 21A through the diode D2. The control power circuit 21A outputs a DC voltage Vb equal to the voltage of the battery 13 to both ends of the first capacitor C1, and outputs a stabilized DC voltage Vcc to both ends of the second capacitor C2.

  The output voltage Vcc of the control power circuit 21A is applied to the power terminal of the microprocessor 21B. The microprocessor 21B includes a CPU, a storage device such as a ROM and a RAM, an input / output interface, and the like, and starts when a stabilized DC voltage Vcc output from the control power supply circuit 21A is established. Various means necessary for controlling the charging relay 20 are configured by executing a program stored in the ROM.

  The charging relay 20 includes an exciting coil 20 </ b> Y that drives the contact 20 a, and the exciting coil 20 </ b> Y is connected between the relay coil connection terminals 11 d and 11 e of the power supply device body 11. One relay coil connection terminal 11d is connected to a connection point between the cathode of the first diode D1 and the cathode of the second diode D2, and the other relay coil connection terminal 11e is connected to the relay drive circuit 21C.

  The relay drive circuit 21C energizes the excitation coil 20Y to energize the charging relay 20 when a relay drive command is given from the microprocessor 21B, and the excitation coil when the microprocessor stops outputting the relay drive command. This is a circuit for deenergizing the charging relay 20 by stopping energization to 20Y.

  The illustrated relay drive circuit 21C has an N-channel MOSFET F1 whose drain is connected to the relay coil connection terminal 11e and whose source is grounded, a resistor R1 connected between the gate and source of the MOSFET F1, and a MOSFET F1. A resistor R2 whose one end is connected to the gate of the second electrode, a third diode D3 whose cathode is connected to the other end of the resistor R2 and whose anode is connected to the detection voltage input terminal 11f, and whose cathode is the other resistor R2. An excitation current supply circuit having a fourth diode D4 connected to the end, a collector connected to the anode of the diode D4, and an emitter connected to the non-ground side terminal of the first capacitor C1 of the control power circuit 21A PNP transistor TR1, a resistor R3 connected between the emitter base of the transistor TR1, and a transistor The collector is connected through the resistor R4 to the base of the transistor TR1, the emitter is grounded, the resistor R5 connected between the base and emitter (ground) of the transistor TR2, and one end connected to the base of the transistor TR2. The other end is composed of a resistor R6 connected to the port P1 of the microprocessor 21B.

  The relay drive circuit 21C turns on the transistors TR2 and TR1 when the microprocessor 21B changes the potential of the port P1 from a low level (L level) to a high level (H level) and outputs a “relay drive command”. In this state, a drive signal is given to the MOSFET F1. As a result, the MOSFET F1 is turned on, an exciting current is passed through the exciting coil 20Y of the charging relay 20, and the normally open contact 20a of the charging relay is turned on. The relay drive circuit 21C also turns on the MOSFET F1 to the exciting coil 20Y of the charging relay 20 when the main switch 15 is closed and the voltage of the battery 13 is input through the main switch 15 and the third diode D3. An exciting current is supplied to turn on the normally open contact 20a of the charging relay.

  In the switch state detection circuit 21D, the emitter is grounded, and the collector is connected to the non-ground side terminal of the second capacitor C2 of the control power supply circuit 21A through the resistor R7 and to the port P2 of the microprocessor through the resistor R8. NPN transistor TR3, a resistor R9 connected between the base and emitter of transistor TR3, and a fifth terminal having a cathode connected to the base of transistor TR3 through resistor R10 and an anode connected to detection voltage input terminal 11f. And a resistor R11 connected between the anode of the diode D5 and the ground.

  The switch state detection circuit 21D turns off the transistor TR3 when the main switch 15 is open, thereby setting the potential of the port P2 of the microprocessor 21B to a high level (H level), and the battery 13 is connected in the correct direction. When the main switch 15 is closed in this state, a base current is supplied to the transistor TR3 to turn on the transistor to change the potential of the port P2 to a low level (L level). The microprocessor 21B detects that the main switch 15 is closed when it recognizes a change in the potential of the port P2 from the H level to the L level. When the main switch 15 is closed while the battery 13 is connected in the opposite direction to the correct direction, the transistor TR3 does not turn on, so the microprocessor 21B detects that the main switch 15 is closed. do not do.

  In the present specification, an L level signal (an output signal of the switch state detection circuit) given to the port P2 of the microprocessor by the switch state detection circuit 21D when the main switch 15 is closed while the battery 13 is in the correct orientation is referred to as “first”. When the main switch 15 is open and when the main switch 15 is closed but the battery 13 is in the opposite direction to the correct direction, the switch state detection circuit 21D is connected to the port P2 of the microprocessor. The H level signal applied to is referred to as a “second signal”.

  The waveform shaping circuit 21E is a circuit that converts the AC voltage output from the AC generator 12 into a rectangular wave signal. The rectangular wave signal obtained from the waveform shaping circuit 21E is input to the port P3 of the microprocessor 21B as a rotation detection signal. ing. The rectangular wave signal output from the waveform shaping circuit 21E is, for example, a signal obtained by shaping one half wave of the output voltage of the AC generator into a rectangular wave shape. The microprocessor 21B recognizes the rising level change of the rectangular wave signal (rotation detection signal) input to the port P3, measures the time of one cycle of the output voltage waveform of the AC generator 12, and measures the measured time. It is converted into “rotational speed calculation data” that gives the time corresponding to one revolution of the crankshaft of the engine (the time required for one revolution of the crankshaft), and the engine rotational speed is converted from this rotational speed calculation data. Get the information.

The voltage detection circuit 21F is a circuit that detects the voltage of the battery 13 and / or the output voltage of the regulator 11A. The illustrated voltage detection circuit 21F includes a resistor R12 having one end connected to the connection point between the cathode of the first diode D1 and the cathode of the second diode D2, and the other end connected to the port P4 of the microprocessor 21B. And a resistor voltage divider comprising a resistor R13 connected between the port P4 and the ground, through the output voltage of the regulator 11A detected through the first diode D1 and the second diode D2 and the main switch 15. The detected voltage of the battery 13 is divided by resistors R12 and R13 and input to the port P4 of the microprocessor.

  When the main switch 15 is closed while the regulator 11A is not outputting a DC voltage, the voltage detection circuit 21F detects the battery voltage, and when the regulator 11A outputs a DC voltage while the main switch 15 is open. The voltage detection circuit 21F detects the output voltage of the regulator. When the regulator 11A outputs a DC voltage and the main switch 15 is closed, the voltage detection circuit 21F detects the output voltage of the regulator 11A and the voltage across the battery (battery voltage). When the contact point 20a of the charging relay is in the on state and the output voltage of the regulator 11A is applied to the battery 13, the output voltage of the regulator and the battery voltage are equal.

  The microprocessor 21B includes, as an input interface, an A / D converter that converts the output voltage of the voltage detection circuit 21F input to the port P4 into a digital signal. From the voltage input to the port P4, the output voltage of the regulator 11A And / or the output voltage of the battery 13 is detected.

  As shown in FIG. 2, the microprocessor 21B executes a program stored in the ROM, thereby charging mode setting means 21B1, rotation speed detection means 21B2, relay drive command generation means 21B3, and failure diagnosis means. 21B4.

  The charging mode setting means 21B1 is a first mode in which the battery is charged only when the main switch is closed, and when the engine speed is equal to or higher than the set speed even when the main switch is open. It is a means to set to the 2nd mode which charges a battery.

  This means includes, for example, a software switch composed of parameters with the name “allowing / prohibiting charging when the main switch is OFF”, and the value of the parameter constituting the software switch is “0x00” ( When the hexadecimal mode is set to 0), the charging mode is set to a second mode that permits charging of the battery when the main switch is off, and the charging mode is set when the parameter is a value other than “0x00”. Is configured to be in a first mode for prohibiting charging of the battery when the main switch is off (charging the battery only when the main switch is closed). The parameter values constituting the software switch can be set from the outside.

  That is, when the charging mode is set to the first mode, the value of the parameter having the name “allowing / prohibiting charging when the main switch is OFF” is set to “0x00” by giving a command to the microprocessor from the outside. When the charging mode is set to the second mode, the value of the parameter with the name “allowing / prohibiting charging when the main switch is OFF” is set to “0x00”. When the microprocessor performs the process of setting the contact of the charging relay to the ON state or the OFF state, the microprocessor checks whether the charging mode is set to the first mode by looking at the value of the parameter as necessary. It is determined whether the mode 2 is set.

  In this embodiment, the charging mode setting means 21B1 is configured on software, but the charging mode is set to the first mode or the second mode by giving a signal to the port of the microprocessor using a dip switch or the like. The charging mode setting means can be configured as follows.

  The rotation speed detection means 21B2 is a means for detecting the rotation speed of the engine from the output voltage of the AC generator 12, and is required for one rotation of the crankshaft of the engine from the rotation detection signal obtained from the waveform shaping circuit 21E. The time is detected as “rotational speed calculation data”.

  The relay drive command generating means 21B3 is a means for outputting a relay drive command from the port P1 or stopping the output of the relay drive command. The relay drive command generation means 21B3 used in the present embodiment is used when the switch state detection circuit 21D generates the first signal (when the main switch 15 is closed and the potential of the port P2 is L level), and When the charge mode is set to the second mode, the switch state detection circuit 21D generates the second signal (the potential of the port P2 is at the H level) and the engine speed detected by the rotation speed detection means. When the rotational speed is equal to or higher than the set speed, the potential of the port P1 is set to H level and a relay drive command is output. The relay drive command generating means 21B3 used in the present embodiment is also configured so that the switch state detection circuit 21D generates the second signal while the charge mode is set to the first mode, and the charge mode is the first mode. When the switch state detection circuit generates the second signal in the state set to mode 2 and the rotational speed detecting means detects that the rotational speed of the engine is lower than the set speed, or the engine stops. When this is detected, the output of the relay drive command is stopped by setting the potential of the port P1 to the L level.

  When the microprocessor 21B sets the potential of the port P1 to the H level and outputs a relay drive command, the MOSFET F1 of the relay drive circuit 21C is turned on to pass an excitation current through the excitation coil 20Y of the charging relay 20, 20a is turned on. When the microprocessor 21B sets the potential of the port P1 to the L level and stops outputting the relay drive command, the MOSFET F1 of the relay drive circuit 21C is turned off and the excitation current to the excitation coil 20Y of the charging relay 20 is turned off. Is stopped and the contact 20a is turned off.

  The microprocessor also includes failure diagnosis means 21B4 for diagnosing whether the regulator 11A and / or the battery 13 is abnormal from the voltage detected by the voltage detection circuit 21F, whether the charging relay is abnormal, or the like. Programmed to configure. The failure detection means 21B4 is, for example, a battery when the battery voltage detected by the voltage detection circuit 21F before starting the engine is less than a set value (for example, when the voltage of a battery having a rated voltage of 12V becomes less than 8V). It is determined that the battery has deteriorated, and the battery is diagnosed as abnormal. Also, if the voltage detected by the voltage detection circuit 21F cannot exceed the set value while the engine speed detected by the rotation speed detecting means 21B2 exceeds the set value, the battery or regulator is abnormal. Diagnose it. Further, when the switch state detection circuit 21D detects that the main switch is closed, the battery is charged when the output voltage of the regulator does not decrease to a set value that gives the lower limit of the battery voltage setting range. It is possible to diagnose that the charging relay is not performed, that is, the charging relay has an abnormality and the contact is not closed.

  When the failure diagnosis means is provided as described above, the relay drive command generation means 21B3 stores the diagnosis result by the failure diagnosis means in the memory before the relay drive command is extinguished (the potential of the port P1 of the microprocessor is set to L level). It is configured to perform the process of storing. If such a process is performed, the diagnosis result stored in the memory when the engine is operated next time is read, and an abnormality display or the like can be performed based on the diagnosis result.

  As is apparent from the above description, in the present embodiment, the microprocessor 21B includes the rotation speed detection means 21B2 that detects the rotation speed of the engine from the output of the AC generator 12, and the switch state detection circuit 21D includes the first signal. , And when the charging mode is set to the second mode, the switch state detection circuit 21D generates the second signal, and the engine speed is set to the set speed by the rotation speed detecting means. When it is detected that the above is detected, a relay drive command is generated, the charging mode is set to the first mode, and the switch state detection circuit generates the second signal, and charging When the mode is set to the second mode, the switch state detection circuit generates the second signal, and the rotational speed of the engine is set by the rotational speed detection means. Relay drive command generating means 21B3 for eliminating the relay drive command when it is detected that the engine is full or the engine is stopped, and a regulator and a voltage based on the voltage detected by the voltage detection circuit 21F (Or) It is programmed to constitute failure diagnosis means 21B4 for diagnosing whether or not there is an abnormality in the battery. When the failure diagnosis unit is provided as in this embodiment, the relay drive command generation unit is configured to perform a process of storing the diagnosis result of the failure diagnosis unit in the memory before stopping the output of the relay drive command. .

  In the above embodiment, if the direction of the battery 13 is correct, the control power circuit 21A from the battery 13 through the main switch 15 and the second diode D2 when the key is operated in one step and the main switch 15 is closed. Is given a voltage. At this time, since the control power supply circuit 21A outputs a stabilized DC voltage, the power supply voltage is applied to the microprocessor 21B, and the microprocessor 21B is activated.

  When the main switch 15 is closed while the battery is correctly connected, a voltage is applied from the battery 13 to the gate of the MOSFET F1 of the relay drive circuit 21C through the third diode D3, and through the second diode D2. Since the battery voltage is applied to the series circuit of the exciting coil 20Y of the charging relay 20 and the MOSFET F1, the MOSFET F1 is turned on and a current flows through the exciting coil 20Y. As a result, the contact 20a of the charging relay is turned on, and the battery 13 is connected between the output terminals of the regulator 11A. At this time, the switch state detection circuit 21D generates the first signal (the potential of the port P2 of the microprocessor is set to L level), and the microprocessor 21B generates the relay drive command with the potential of the port P1 being set to H level. Even in response to this relay drive command, the relay drive circuit 21C causes an excitation current to flow through the excitation coil 20Y of the charging relay 20 and keeps the normally open contact 20a of the charging relay 20 in an ON state. At this time, current is supplied to the load 14 from the battery 13 and the regulator 11A through the main switch 15.

  When the contact 20a of the charging relay 20 is turned on, the battery 13 is charged with the output of the regulator, the main switch 15 is closed and the load 14 is driven, and the key switch is operated to open the main switch 15. Since the switch state detection circuit 21D provides the second signal to the port P2 of the microprocessor, the microprocessor stops outputting the relay drive command. When the main switch 15 is opened, the voltage input from the battery 13 to the relay drive circuit 21C through the third diode D3 disappears. Accordingly, the supply of the excitation current to the excitation coil 20Y of the charging relay is stopped, and the contact 20a of the charging relay is turned off.

  When the charging mode is set to “second mode” (a mode in which the battery is charged when the engine speed is equal to or higher than the set speed even when the main switch is open) by the charging mode setting means 21B1. Because, even when the main switch 15 is opened, when it is detected that the rotational speed of the AC generator is equal to or higher than the set speed, a relay drive command is given from the port P1 of the microprocessor 21B to the relay drive circuit 21C. The exciting current is supplied from the relay drive circuit to the exciting coil of the charging relay 20, and the contact 20a is turned on. As a result, the output of the regulator 11A is supplied to the battery 13, and the battery is charged.

  When the battery 13 is connected in a direction opposite to the correct direction, the diode D2 prevents the battery voltage from being input to the control power circuit 21A when the main switch 15 is closed. The power supply circuit 21A does not output the stabilized DC voltage Vcc, and the microprocessor 21B does not start. Further, when the battery 13 is connected in the reverse direction, the diode D2 prevents the battery voltage from being applied to the exciting coil 20Y of the charging relay 20, so that the contact 20a of the charging relay 20 is not closed. Absent. Therefore, it is possible to prevent the battery voltage from being applied to the regulator 11A in the reverse direction, and it is possible to prevent the regulator from being destroyed by a short-circuit current flowing from the battery through the diodes Dx, Du and Dy, Dv in the regulator. it can. Further, when the battery is connected in the reverse direction, the third diode D3 can prevent the battery voltage from being applied in the reverse direction to the relay drive circuit 21C, so that the relay drive circuit 21C is damaged. Can be prevented. Similarly, since the diode D5 can prevent the battery voltage from being input to the switch state detection circuit 21D in the reverse direction, the transistor TR3 of the switch state detection circuit can be prevented from being damaged.

  When the battery is connected in the reverse direction, the starter motor does not rotate even if the key switch is operated to the position where the engine is started. Therefore, the voltage is supplied from the AC generator 12 to the control power supply circuit 21A through the regulator 11A. Never given. Therefore, the microprocessor 21B does not start up and no relay drive command is given from the microprocessor 21B to the relay drive circuit 21C, so that the contact 20a of the charging relay is not closed.

  In the above description, the main switch 15 is incorporated in the key switch operated when starting and stopping the engine, and the operation of starting the engine is performed after the main switch 15 is closed. Is provided separately from the key switch, and when the engine is started regardless of the state of the main switch, and when the battery 13 is a battery different from the battery used to operate the engine. The engine may be started with the main switch 15 open.

  When the engine is started with the main switch 15 opened, the output voltage of the AC generator 12 is rectified by the regulator 11A and input to the control power circuit 21A through the first diode D1. Therefore, the stabilized DC voltage Vcc is output from the control power supply circuit 21A, and the microprocessor 21B is activated. When the main switch 15 is closed after the engine is started and the battery 13 is correctly connected, the switch state detection circuit 21D provides a first signal to the port P2 of the microprocessor. At this time, since the microprocessor 21B generates a relay driving command from the port P1, the exciting current is supplied from the relay driving circuit 21C to the exciting coil 20Y of the charging relay 20, the contact 20a of the charging relay is turned on, and the regulator 11A Thus, the battery 13 can be supplied with a charging current.

  When the main switch 15 is closed after the engine is started in a state where the battery 13 is connected in the opposite direction when the battery 13 is a battery different from the battery used for operating the engine. Since the switch state detection circuit 21D provides the second signal to the port P2 of the microprocessor 21B (the microprocessor cannot detect that the main switch is closed), the microprocessor does not generate a relay drive command. Therefore, when the main switch 15 is closed after the engine is started with the battery connected in the reverse direction, the contact of the charging relay is closed and the voltage of the battery is applied to the regulator in the reverse direction. Can be prevented.

  When the battery 13 is a battery different from the battery used for operating the engine and the charging mode is set to the second mode, even if the battery is reversely connected, When the rotational speed becomes equal to or higher than the set speed, the microprocessor may output a relay drive command to excite the charging relay 20. In order to prevent such a situation from occurring, AC power generation is performed with the main switch 15 open, provided that the microprocessor detects that the main switch is closed once after the engine is started. It is preferable to program the microprocessor so that a relay drive command is generated when the rotational speed of the machine exceeds the set speed. With this configuration, when the battery is connected in the reverse direction, it is impossible to detect that the main switch is closed after the engine is started, so the battery is connected in the reverse direction. After starting the engine in a state, it can prevent the microprocessor from issuing a relay drive command when the rotational speed of the alternator reaches the set speed, and with the battery connected in the reverse direction After the engine is started, the contact of the charging relay is turned on to prevent the battery voltage from being applied to the regulator in the reverse direction.

  FIG. 3 to FIG. 6 are flowcharts showing an example of an algorithm of a program executed by the microprocessor 21B in order to constitute the rotational speed detection means 21B2 and the relay drive command generation means 21B3 in the above embodiment. It was.

  FIG. 3 shows a main routine which is started after the microprocessor is started. When this main routine is started, the input / output port and RAM are initially set in step S101, and the charging current ON determination process shown in FIG. 5 is performed in step S102. Next, in step S103, an interval timer is set to permit interruption. After permitting the interrupt, the system waits for an interrupt by the interval timer in step S104, and proceeds to step S105 when the interrupt occurs. In step S105, the battery voltage detected by the voltage detection circuit 21F is read. Next, the process proceeds to step S106, and the engine rotation speed (the rotation speed of the AC generator 12) is calculated from the rotation speed calculation data detected by the rotation detection signal processing shown in FIG.

  After calculating the rotation speed in step S106, the process proceeds to step S107 to determine whether or not the contact of the charging relay is in an ON state. As a result, when it is determined that the contact point of the charging relay is not in the ON state, the process proceeds to step S108, performs the charging relay ON determination process shown in FIG. 5, and then returns to step S104. If it is determined in step S107 that the contact point of the charging relay is in the ON state, the process proceeds to step S109 to perform the charging relay OFF determination process shown in FIG. 6 and then returns to step S104.

  The rotation detection signal processing shown in FIG. 4 is executed each time the microprocessor detects a change in the rising level of the rectangular wave signal supplied from the waveform shaping circuit 21E. In the process of FIG. 4, first, in step S201, the time from the time when the previous rotation detection signal (the level change of the rectangular wave signal) is input to the time when the current rotation detection signal is input is determined by the crankshaft of the engine. The time required for one rotation is converted, and this time is stored in the RAM as “rotational speed calculation data”.

  In the charging relay ON determination process of FIG. 5, it is first determined in step S301 whether or not the charging relay contact is in an ON state. As a result of this determination, when it is determined that the contact of the charging relay is in the ON state, the process is terminated without doing anything thereafter. When it is determined in step S301 that the contact point of the charging relay is not in the ON state, the process proceeds to step S302 to determine whether or not the main switch is detected to be in the ON state from the output of the switch state detection circuit 21D. As a result, when it is detected that the main switch is in the ON state, the process proceeds to step S303 to generate a relay drive command and then returns to the main routine.

  When it is determined in step S302 that the main switch is not in the ON state, the process proceeds to step S304 to determine whether or not charging when the main switch is ON is permitted (whether or not the charging mode is the second mode). When it is determined that charging when the main switch is ON is not permitted (the charging mode is the first mode), the process returns to the main routine without doing anything thereafter. When it is determined in step S304 that charging when the main switch is ON is permitted (the charging mode is the second mode), the process proceeds to step S305, and the engine speed detected by the speed detecting means is detected. It is determined whether or not a set speed permitting charging has been reached. As a result of this determination, when it is determined that the engine speed has not reached the set speed at which charging is permitted, the process returns to the main routine without doing anything thereafter. If it is determined in step S305 that the engine speed has reached the set speed at which charging is permitted, the process proceeds to step S303 to generate a relay drive command, and then returns to the main routine.

  In the charging relay OFF determination process shown in FIG. 6, it is first determined in step S401 whether or not the main switch is closed. As a result, when it is determined that the main switch is closed, the process returns to the main routine without doing anything thereafter. If it is determined in step S401 that the main switch is not closed, the process proceeds to step S402 to determine whether or not the engine is stopped (whether or not the rotational speed detected by the rotational speed detection means is zero). As a result, when it is determined that the engine is not stopped, the process returns to the main routine without doing anything thereafter. When it is determined in step S402 that the engine is stopped, the process proceeds to step S403, where it is determined whether or not the storage of the failure diagnosis result by the failure diagnosis means is completed, and if it is not completed, nothing is done. Return to the main routine. If it is determined in step S403 that the storage of the failure diagnosis result by the failure diagnosis means has been completed, the process proceeds to step S404 to stop the relay drive command and then return to the main routine.

  In the case of the algorithm shown in FIGS. 3 to 6, the rotational speed detecting means 21B2 is constituted by the processing of FIG. 4 and step S106 of the main routine of FIG. The relay drive command generation means 21B3 is configured by the charge relay ON determination process shown in FIG. 5 and the charge relay OFF determination process shown in FIG.

  In the above embodiment, the battery charging mode is the first mode in which the battery is charged only when the main switch is closed, and the engine speed is equal to or higher than the set speed even when the main switch is open. Charge mode setting means for setting the second mode for charging the battery is provided, and the rotation speed detection means 21B2 for detecting the rotation speed of the engine from the output of the AC generator, and the switch state detection circuit 21D are the first signals. , And when the charge mode is set to the second mode, the switch speed detection circuit 21D generates the second signal and the engine speed detected by the speed detection means. Generates a relay drive command when the speed is higher than the set speed, and the switch state detection circuit The rotation speed of the engine detected by the rotation speed detecting means when the switch state detection circuit generates the second signal when the signal 2 is generated and the charging mode is set to the second mode. Is programmed to constitute a relay drive command generating means for eliminating the relay drive command when the speed is less than the set speed, the power supply device according to the present invention basically has a main switch It may be configured to control the charging relay according to the state of the main switch so that the contact of the charging relay is turned off when it is open and the charging relay is turned on when the main switch is closed. The charging mode setting means can be omitted.

  When the charging mode setting means is omitted, the microprocessor generates a relay drive command when the switch state detection circuit is generating the first signal, and the switch state detection circuit is generating the second signal. Sometimes programmed to constitute a relay drive command generating means for eliminating the relay drive command.

  In the above embodiment, the microprocessor 21B is also programmed to constitute a failure diagnosis means for diagnosing whether or not there is an abnormality in the regulator and / or battery from the voltage detected by the voltage detection circuit 21F. The failure diagnosis means can be omitted when it is not particularly necessary to diagnose whether the regulator and / or the battery is abnormal.

  In the charging relay OFF determination process of FIG. 6, when it is detected in step S402 that the engine has stopped, the process proceeds to step S403. However, in step 402, it is determined whether or not the engine speed is less than the set speed. Then, when the rotational speed of the engine is lower than the set speed (when the AC generator is in a state where it is not possible to generate an output necessary for charging the battery), the process may proceed to step S403.

  As in the above-described embodiment, the third diode D3 having the anode connected to the positive terminal of the battery through the main switch is provided, and the voltage of the battery 13 passes through the main switch 15 and the third diode D3 and the relay drive circuit 21C. If an excitation current is supplied to the charging relay even when it is input to the charging relay, even if no relay drive command is issued from the microprocessor 21B when the main switch 15 is closed, the charging relay Since the contact can be turned on, even when the microprocessor 21B does not start up or the switch state detection circuit 21D fails, the contact 14a of the charging relay 20 is turned on to drive the load 14. The advantage that the battery 13 can be charged is obtained. However, the present invention is not limited to such a configuration. The third diode D3 is omitted, and the charging relay is excited only when the microprocessor 21B outputs a relay drive command. It may be configured.

  In the above embodiment, a single-phase AC generator is used as the AC generator 12. However, it is needless to say that the present invention can also be applied when a three-phase AC generator is used.

  In the above embodiment, a short-circuit regulator is used as the regulator, but the regulator 11A rectifies the AC voltage input through the AC input terminal and outputs a DC voltage whose voltage value is adjusted between the DC output terminals. Any regulator with a rectifying function may be used, and other types of regulators may be used. For example, a control rectifier circuit in which the upper arm and / or lower arm of the bridge of a full-bridge type full-wave rectifier circuit is configured by a unidirectional switching element such as a thyristor, and control when the battery voltage exceeds a set value The present invention is also applied to the case where an open type regulator that controls the switching element so as to stop the supply of current to the battery by turning off the switching element of the upper and / or lower arm of the rectifier circuit. Can do. When an open type regulator is used, when a voltage is applied to the AC input terminal, a trigger signal is immediately supplied to the switching element to be turned on (a switching element to which a forward voltage is applied). The trigger circuit of each switching element is configured so that the regulator immediately outputs a DC voltage when an AC voltage is input to the AC input terminal.

  In the above embodiment, the microprocessor 21B is provided mainly for controlling the charging relay. However, the microprocessor 21B can also be configured to serve as a microprocessor for controlling the regulator. In this case, for example, a step of executing control of the regulator is provided between step S106 and step S107 of the main routine of FIG.

  In the above embodiment, the voltage detection circuit 21F is configured to detect a voltage reflecting both the battery voltage and the output voltage of the regulator, but the voltage detection circuit that detects the battery voltage and the output of the regulator It is also possible to provide a voltage detection circuit for detecting a voltage separately and to perform failure diagnosis from the output of these voltage detection circuits.

  The present invention can be applied to a power supply device mounted on a vehicle or the like driven by an engine, or a power supply device such as a standby power supply facility.

DESCRIPTION OF SYMBOLS 10 Engine 11 Power supply device main body 11u, 11v AC input terminal 11a, 11b DC output terminal 11A Regulator 11A1 Short circuit rectifier 11A2 Control circuit 12 Alternator 13 Battery 14 Load 15 Main switch 20 Charging relay 20a Normally open contact 20Y Excitation coil 21 Charging relay control unit 21A Control power supply circuit 21B Microprocessor 21B1 Charging mode setting means 21B2 Rotational speed detection means 21B3 Relay drive command generation means 21B4 Fault diagnosis means 21C Relay drive circuit 21D Switch state detection circuit 21E Waveform shaping circuit 21F Voltage detection circuit D1 1st diode D2 2nd diode D3 3rd diode

Claims (4)

The voltage value was adjusted by rectifying the AC voltage input through the AC input terminal, the AC input terminal to which the output of the AC generator driven by the engine is input, the positive and negative DC output terminals, and the AC input terminal. A power supply device main body having a regulator for outputting a direct current voltage between the direct current output terminals, and a direct current voltage obtained between the direct current output terminals of the power supply device main body and a load provided in parallel to the battery A main switch is inserted between the positive terminal of the battery and one end of the load,
A charging relay having a normally open contact, the normally open contact inserted in series in a circuit connecting the DC output terminal on the positive side and the positive terminal of the battery;
The regulator output voltage is input through the first diode, and the battery output voltage is input through the main switch and the second diode to convert the input voltage into a stabilized DC voltage. A control power circuit;
A microprocessor that is activated when the stabilized DC voltage output from the control power supply circuit is input to a power supply terminal and the stabilized DC voltage is established;
A relay driving circuit that excites the charging relay when a relay driving command is given, and demagnetizes the charging relay when the relay driving command disappears;
A voltage of the battery is detected through the main switch, and a first signal is generated when the battery is correctly oriented and the main switch is closed, and when the main switch is open and the main switch A switch state detection circuit that generates a second signal when the battery is closed but the battery orientation is opposite to the correct orientation;
With
The microprocessor generates the relay driving command when the switch state detection circuit generates the first signal, and the microprocessor generates the second signal when the switch state detection circuit generates the second signal. Programmed to constitute a relay drive command generating means for eliminating the relay drive command,
The regulator is configured to immediately output a DC voltage when the AC generator generates an output;
A power supply characterized by. The voltage value was adjusted by rectifying the AC voltage input through the AC input terminal, the AC input terminal to which the output of the AC generator driven by the engine is input, the positive and negative DC output terminals, and the AC input terminal. A power supply device main body having a regulator that outputs a DC voltage between the DC output terminals, and a DC voltage obtained between the DC output terminals is supplied to a battery and a load provided in parallel to the battery. A power supply device in which a main switch is inserted between a positive terminal of the battery and one end of the load,
A charging relay having a normally open contact, the normally open contact inserted in series in a circuit connecting the DC output terminal on the positive side and the positive terminal of the battery;
The regulator output voltage is input through the first diode, and the battery output voltage is input through the main switch and the second diode to convert the input voltage into a stabilized DC voltage. A control power circuit;
A microprocessor that is activated when the stabilized DC voltage output from the control power supply circuit is input to a power supply terminal and the stabilized DC voltage is established;
A relay driving circuit that excites the charging relay when a relay driving command is given, and demagnetizes the charging relay when the relay driving command is extinguished;
A voltage of the battery is detected through the main switch, and a first signal is generated when the battery is correctly oriented and the main switch is closed, and when the main switch is open and the main switch A switch state detection circuit that generates a second signal when the battery is closed but the battery orientation is opposite to the correct orientation;
The battery charging mode is a first mode in which the battery is charged only when the main switch is closed, and the battery is charged when the engine speed is equal to or higher than a set speed even when the main switch is open. Charging mode setting means for setting to the second mode,
With
The microprocessor includes a rotation speed detection means for detecting a rotation speed of the engine from the output of the AC generator, the switch state detection circuit is generating the first signal, and the charge mode is the first When the switch state detection circuit generates the second signal in the state where the mode 2 is set and the rotational speed detecting means detects that the rotational speed of the engine is equal to or higher than the set speed. The relay drive command is generated, the switch mode detection circuit generates a second signal in the state where the charge mode is set to the first mode, and the charge mode is set to the second mode. In the set state, the switch state detection circuit generates a second signal, and the rotational speed detecting means detects that the rotational speed of the engine is less than the set speed. Is the time or the engine is programmed to configure a relay driving command generating means to extinguish the relay driving command when it is detected that is stopped,
The regulator is configured to immediately output a DC voltage when the AC generator generates an output;
A power supply characterized by. A voltage detection circuit for detecting the voltage of the battery and / or the output voltage of the regulator;
The microprocessor is programmed to constitute a failure diagnosis means for diagnosing whether or not the regulator and / or battery is abnormal from the voltage detected by the voltage detection circuit,
The said relay drive command generation means is comprised so that the process which memorize | stores the diagnostic result by the said fault diagnostic means in a memory may be performed before stopping the output of the said relay drive command. The power supply described. A third diode having an anode connected to the positive terminal of the battery through the main switch is provided, and the voltage of the battery is input to the relay drive circuit through the main switch and the third diode;
The relay driving circuit is configured to supply an excitation current to the charging relay even when the output voltage of the battery is input through the third diode and the main switch when the main switch is closed. The power supply device according to claim 1, 2 or 3.

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