Power supply device and power supply control method

Abstract

To prevent the occurrence of abnormal operation when a ground terminal is in an ungrounded state.SOLUTION: A power supply device that converts an AC signal output by a generator into a DC voltage and supplies the DC voltage to a grounded load includes a first switch element that is connected between the ground terminal of a power supply and the output terminal of the generator, and in which at least the output terminal is connected to the output terminal of the generator and that rectifies the negative side of the AC signal, a second switch element in which the input terminal is connected to the output terminal of the generator and the output terminal is connected to the load, and that rectifies the positive side of the AC signal, a capacitor connected between the output terminal of the second switch element and the ground terminal, a control unit that controls conduction of the first switch element and the second switch element according to switching between positive and negative of the AC signal, and an abnormality detection unit that determines that the ground terminal is ungrounded and turns off the first switch element when the voltage of the capacitor exceeds a predetermined threshold voltage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply device and a power supply control method. [Background technology]

[0002] In recent years, power supply devices such as regulators that convert AC signals generated by a generator into DC voltages have become known (see, for example, Patent Document 1). In such power supply devices, a capacitor is connected between the output terminal for the DC voltage and a ground terminal, and the output DC voltage is supplied to an external load section that is grounded. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-115071 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional power supply devices, when the ground terminal becomes ungrounded, an abnormal voltage may be charged to the capacitor connected between the DC voltage output terminal and the ground terminal through the external load, causing an operational abnormality.

[0005] The present invention has been made to solve the above-mentioned problems, and its object is to provide a power supply device and a power supply control method that can prevent operational abnormalities from occurring when an abnormal voltage is charged to a capacitor even if the ground terminal is in an ungrounded state. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention is a power supply device that converts an AC signal output by a generator into a DC voltage and supplies the DC voltage to a grounded load, the power supply device being connected between a ground terminal of the power supply device and an output terminal of the generator, and having at leastFirst switch element a first switch element having an output terminal connected to an output terminal of the generator, for rectifying a negative side signal of the AC signal; The above Connected to the generator output terminals, Second switch element The power supply device comprises: a second switch element having an output terminal connected to the load section and rectifying a positive-side signal of the AC signal; a capacitor connected between the output terminal of the second switch element and the ground terminal; a control section that controls the conduction of the first switch element and the second switch element in response to switching between positive and negative of the AC signal; and an abnormality detection section that determines that the ground terminal is not grounded and turns off the first switch element when the voltage of the capacitor becomes equal to or higher than a predetermined threshold voltage.

[0007] Moreover, one aspect of the present invention is characterized in that, in the above-mentioned power supply device, the predetermined threshold voltage is a first threshold voltage, and the control unit turns the second switch element off when the voltage of the capacitor becomes equal to or higher than a second threshold voltage lower than the first threshold voltage.

[0008] Moreover, one aspect of the present invention is characterized in that, in the above-mentioned power supply device, the abnormality detection unit includes a Zener diode that is turned on when the voltage of the capacitor becomes equal to or higher than the predetermined threshold voltage, and when the Zener diode is turned on, the first switch element is turned off.

[0009] Moreover, one aspect of the present invention is characterized in that, in the above-mentioned power supply device, the capacitor is a first capacitor, which is connected between the input terminal of the first switch element and the ground terminal, and further includes a second capacitor or a resistor connected in series with the first capacitor with the ground terminal as an intermediate node.

[0010] According to another aspect of the present invention, there is provided a power supply device that converts an AC signal output by a generator into a DC voltage and supplies the DC voltage to a grounded load, the power supply device being connected between a ground terminal of the power supply device and an output terminal of the generator, and having at least First switch elementa first switch element having an output terminal connected to an output terminal of the generator, for rectifying a negative side signal of the AC signal; The above Connected to the generator output terminals, Second switch element A power supply control method for a power supply device including a second switch element having an output terminal connected to the load section, rectifying a positive-side signal of the AC signal, and a capacitor connected between the output terminal of the second switch element and the ground terminal, the power supply control method including a control step in which a control unit controls the conduction of the first switch element and the second switch element in response to switching between positive and negative of the AC signal, and an abnormality detection step in which an abnormality detection unit determines that the ground terminal is not grounded when a voltage of the capacitor with respect to the ground terminal becomes equal to or higher than a predetermined threshold voltage, and turns off the first switch element. Effect of the Invention

[0011] According to the present invention, in the power supply device, an AC signal output by a generator is converted into a DC voltage, and the DC voltage is supplied to a grounded load section, and a control section controls the conduction of the first switch element and the second switch element in response to switching between positive and negative of the AC signal. Then, when the voltage of the capacitor based on the ground terminal becomes equal to or higher than a predetermined threshold voltage, the abnormality detection section determines that the ground terminal is in an ungrounded state and turns off the first switch element. In this way, when the ground terminal is in an ungrounded state, the current detection device can prevent an abnormal voltage from being charged in the capacitor via the grounded load section at the time of a negative signal of the AC signal, causing an operational abnormality. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing an example of a power supply system and a power supply device according to a first embodiment. [Diagram 2] 4 is a first flowchart illustrating an example of a power supply control process in the first embodiment. [Diagram 3] 6 is a second flowchart illustrating an example of a power supply control process in the first embodiment. [Figure 4] 5A to 5C are diagrams illustrating an example of an operation when a ground terminal of the power supply device according to the first embodiment is in an ungrounded state. [Diagram 5] 5 is a timing chart illustrating an example of the operation of the abnormality detection unit and the control unit when the ground terminal in the first embodiment is in an ungrounded state. [Figure 6] FIG. 11 is a block diagram showing an example of a power supply system and a power supply device according to a second embodiment. [Figure 7] FIG. 11 is a block diagram showing an example of a power supply system and a power supply device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply device and a power supply control method according to an embodiment of the present invention will now be described with reference to the drawings.

[0014] [First embodiment] FIG. 1 is a block diagram showing an example of a power supply system 100 and a power supply device 1 according to the first embodiment. As shown in FIG. 1, the power supply system 100 is a system mounted on a vehicle such as a motorcycle, and includes a power supply device 1, a generator 2, a battery 3, an FI load section 5, load sections (4, 6), and a lighting device 7.

[0015] The power supply device 1 half-wave rectifies the AC power generated by the generator 2 to charge the battery 3 and supply DC power to the load unit 4. The power supply device 1 is also connected to the FI load unit 5 and the load unit 6 via a diode 13, and supplies the power generated by the generator 2 or the output power of the battery 3 to the FI load unit 5 and the load unit 6.

[0016] The power supply device 1 includes an input terminal T1, a battery terminal T2, an output terminal T3, a ground terminal T4, an LA terminal T5 (light anode terminal), and an LK terminal T6 (light cathode terminal).

[0017] The input terminal T1 is a terminal to be connected to the generator 2, and an AC signal generated by the generator 2 is supplied to the input terminal T1. The battery terminal T2 is a terminal to which the battery 3 and the load section 4 are connected, and supplies DC power for charging the battery 3, and also receives power from the battery 3 when the generator 2 is stopped.

[0018] The output terminal T3 is a terminal to which the FI load unit 5 and the load unit 6 are connected, and supplies DC power to the FI load unit 5 and the load unit 6. The ground terminal T4 is a terminal, for example a ground terminal, for grounding the power supply device 1. The power supply device 1 is grounded to the body of a vehicle such as a motorcycle via the ground terminal T4.

[0019] The LA terminal T5 and the LK terminal T6 are terminals to which the lighting device 7 is connected, with the LA terminal T5 being connected to the anode terminal of the lighting device 7 and the LK terminal T6 being connected to the cathode terminal of the lighting device 7. Furthermore, the power supply device 1 includes a thyristor 11, a thyristor 12, a diode 13, a capacitor 14, a capacitor 15, an abnormality detection unit 16, and a control unit 17. Details of each component included in the power supply device 1 will be described later.

[0020] The generator 2 is, for example, a single-phase magneto type AC generator, which generates power in response to the rotation of a rotor (not shown) and outputs an AC signal corresponding to the generated power. Here, the rotor is, for example, a crankshaft connected to a rotating shaft of an internal combustion engine (engine) of a motorcycle. The generator 2 is connected to the thyristor 12 via a power supply line L1 to transmit an AC signal corresponding to the generated power. In this embodiment, the negative voltage (negative side voltage) of the AC signal is a voltage of a first polarity, and the positive voltage (positive side voltage) is a voltage of a second polarity that is a voltage of the opposite polarity to the voltage of the first polarity.

[0021] The battery 3 is, for example, a lead storage battery, and has a + (plus) electrode (positive electrode) connected to the cathode terminal (battery terminal T2) of the thyristor 12, and a - (minus) electrode (negative electrode) connected (grounded) to the ground. The battery 3 is charged with the power generated by the generator 2, which is supplied via the power supply line L1 and the thyristor 12, and supplies the charged power to the FI load unit 5 and the load unit 6 via the diode 13. The battery 3 also supplies the charged power to the load unit 4.

[0022] The load unit 4 is a load unit directly connected to the battery 3 . The FI load unit 5 is, for example, an electrical component of a motorcycle, such as an ECU (Engine Control Unit), a fuel pump, an injection, various sensors, etc. The FI load unit 5 is connected between the output terminal T3 and the ground, and is supplied with the generated power of the generator 2 or the output power of the battery 3 via the diode 13 to operate and consume power. The load unit 6 is connected between the output terminal T3 and the ground, and is supplied with the generated power of the generator 2 or the output power of the battery 3 via a diode 13.

[0023] The lighting device 7 is, for example, a vehicle LED (Light Emitting Diode) light. When the thyristor 11 is turned on, the lighting device 7 emits light when a current flows therethrough at a timing when the AC signal on the power supply line L1 is at a negative voltage.

[0024] The lighting device 7 also includes a light emitting diode 7A and a light emitting diode 7B connected in series. The anode terminal of the light emitting diode 7A and the cathode terminal of the light emitting diode 7B are connected to each other, and the light emitting diodes 7A and 7B are connected in series. The anode terminal of the light emitting diode 7B is connected to the LA terminal T5, and the cathode terminal of the light emitting diode 7A is connected to the LK terminal T6. A resistor (a resistor connected in series with the capacitor 14 with the ground terminal T4 as an intermediate node) for limiting the current may be connected to the light emitting diodes 7A and 7B.

[0025] Next, each component of power supply device 1 will be described in detail. The thyristor 11 (an example of a first switch element) has an anode terminal connected to a node N1 which is the LK terminal T6, a cathode terminal connected to a node N2 of the power supply line L1, and a gate terminal (control terminal) connected to a control signal line (signal line of the control signal S1) output by the control unit 17.

[0026] The thyristor 11 is connected between the ground terminal T4 of the power supply device 1 and the output terminal of the generator 2, and rectifies the negative side of the AC signal with at least its cathode terminal (output terminal) connected to the output terminal of the generator 2 (input terminal T1 of the power supply device 1). The thyristor 11 is controlled as to whether or not to be in an on state (conducting state) by a control signal S1 output by the control unit 17. The thyristor 11 is controlled to be in an on state by the control signal S1 output by the control unit 17 when the AC signal output by the generator 2 is a negative voltage.

[0027] The thyristor 12 (an example of a second switch element) is a silicon controlled rectifier that rectifies the AC signal output by the generator 2 and supplies it as charging power to the battery 3. The thyristor 12 has an anode terminal connected to a node N2 of the power supply line L1, a cathode terminal connected to a node N3 (battery terminal T2), and a gate terminal (control terminal) connected to a control signal line (signal line of the control signal S2) output by the control unit 17.

[0028] The thyristor 12 has an anode terminal (input terminal) connected to the output terminal of the generator 2 (input terminal T1 of the power supply device 1) and a cathode terminal (output terminal) connected to a load section (e.g., load section 4, etc.), and rectifies the positive side of the AC signal. When the thyristor 12 is turned on by a control signal S2 output by the control section 17, the thyristor 12 supplies the positive side voltage of the AC signal of the power supply line L1 to the + electrode of the battery 3 to charge the battery 3 and supply operating power to the FI load section 5.

[0029] The diode 13 has an anode terminal connected to the node N3 and a cathode terminal connected to the node N4 (output terminal T3), and prevents a current from flowing back from the FI load unit 5. Capacitor 14 (an example of a first capacitor) is connected between the cathode terminal (output terminal) of thyristor 12 and ground terminal T4 (ground line L2) and smoothes the DC voltage supplied to FI load unit 5 and load unit 6.

[0030] Capacitor 15 (an example of a second capacitor) is connected between the anode terminal (input terminal, node N1) of thyristor 11 and ground terminal T4 (ground line L2), and smoothes the DC voltage supplied to the lighting device 7. Capacitor 15 is connected in series with capacitor 14, with ground terminal T4 serving as an intermediate node.

[0031] When the voltage Vcx of the capacitor 14 becomes equal to or higher than a predetermined threshold voltage (above a first threshold voltage), the abnormality detection unit 16 determines that the ground terminal T4 is not grounded and turns off the thyristor 11. Here, the voltage Vcx of the capacitor 14 is the voltage of the node N4 with respect to the ground terminal T4, and the first threshold voltage is, for example, a threshold voltage Vth1. The abnormality detection unit 16 includes a diode 161, a Zener diode 162, a resistor 163, and a transistor 164.

[0032] The diode 161 and the Zener diode 162 are connected in series in the opposite directions. The diode 161 has an anode terminal connected to the node N4 and a cathode terminal connected to the cathode terminal of the Zener diode 162. The diode 161 prevents a reverse current flow when detecting the voltage Vcx of the capacitor 14, which is the voltage at the node N4.

[0033] The Zener diode 162 has an anode terminal connected to a first terminal of the resistor 163 and a cathode terminal connected to the cathode terminal of the diode 161. The Zener diode 162 is adjusted to be turned on when the voltage Vcx of the capacitor 14 (the voltage of the node N4 with respect to the ground terminal T4) becomes equal to or higher than the above-mentioned threshold voltage Vth1. That is, the Zener diode 162 becomes on when the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth1 (a predetermined threshold voltage).

[0034] The resistor 163 has a first terminal connected to the anode terminal of the Zener diode 162 and a second terminal connected to the base terminal of the transistor 164. The resistor 163 limits the current to the base terminal of the transistor 164 (base current).

[0035] The transistor 164 is, for example, an NPN bipolar transistor, and has a collector terminal connected to the ground terminal T4 (ground line L2), a base terminal connected to a second terminal of the resistor 163, and an emitter terminal connected to a node N5 of the control unit 17, which will be described later. When the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth1, the Zener diode 162 conducts, causing a base current to flow (the base terminal becomes a High state), and the transistor 164 becomes an ON state. As a result, the transistor 174, which will be described later, is fixed to an OFF state, and the abnormality detection unit 16 turns the thyristor 11 to an OFF state. That is, when the Zener diode 162 becomes an ON state, the abnormality detection unit 16 turns the thyristor 11 to an OFF state.

[0036] The control unit 17 controls the conduction of the thyristor 11 and the thyristor 12 in response to switching between positive and negative AC signals. The control unit 17 outputs a control signal S1 that controls the conduction of the thyristor 11, and also outputs a control signal S2 that controls the conduction of the thyristor 12. During a period in which the AC signal has a negative voltage, the control unit 17 sets the control signal S1 to a signal state that turns on the thyristor 11, for example. Also, during a period in which the AC signal has a positive voltage, the control unit 17 sets the control signal S2 to a signal state that turns on the thyristor 12, for example. The control unit 17 includes a battery control unit 171, diodes (172, 176), resistors (173, 175), and a transistor 174.

[0037] The battery control unit 171 controls the charging and discharging of the battery 3 by controlling the conduction of the thyristor, and also controls the supply of DC power to the load unit 4, the FI load unit 5, and the load unit 6. The battery control unit 171 sets the control signal S2 to a low state (a state in which the thyristor 12 is turned off) during a period of negative voltage of the AC signal (the power supply line L1 (node ​​N2) is at a negative voltage) or, for example, when the voltage Vcx of the capacitor 14 (the voltage of the node N4) is equal to or higher than the threshold voltage Vth2. That is, the control unit 17 sets the thyristor 12 to an off state when the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth2.

[0038] Furthermore, the battery control unit 171 sets the control signal S2 to a high state (a state in which the thyristor 12 is turned on) during a period of positive voltage of the AC signal (the power supply line L1 (node ​​N2) is at the positive voltage) and when the voltage Vcx of the capacitor 14 is less than the threshold voltage Vth2. Here, the threshold voltage Vth2 is a voltage smaller than the above-mentioned threshold voltage Vth1, and is a threshold voltage at which charging of the battery 3 and power supply to the FI load unit 5 and the like are stopped.

[0039] The diode 172 has an anode terminal connected to a first terminal of the resistor 173 and a cathode terminal connected to the node N2. The diode 172 is turned on during a period of a negative voltage of the AC signal (the power supply line L1 (node ​​N2) is at a negative voltage) and is turned off during a period of a positive voltage of the AC signal (the power supply line L1 (node ​​N2) is at a positive voltage), thereby preventing a reverse flow of the positive voltage of the AC signal.

[0040] The resistor 173 has a first terminal connected to the anode terminal of the diode 172 and a second terminal connected to the base terminal of the transistor 174. The resistor 173 limits the current to the base terminal of the transistor 174 (base current).

[0041] The transistor 174 is, for example, a PNP bipolar transistor, with an emitter terminal connected to the ground terminal T4 (ground line L2), a base terminal connected to the second terminal (node ​​N5) of the resistor 173, and a collector terminal connected to the first terminal of the resistor 175. When the diode 172 is turned on (while the node N2 is at a negative voltage) and the above-mentioned transistor 174 is in an off state, the transistor 174 is turned on. In this case, the base terminal is in a low state, so that the transistor 174 is turned on.

[0042] Moreover, when the diode 172 is turned off (the period when the node N2 is at a positive voltage) or when the above-mentioned transistor 174 is in an on state, the transistor 174 is turned off. In this case, the base terminal is in a high state, so that the transistor 174 is turned off.

[0043] The resistor 175 has a first terminal connected to the collector terminal of the transistor 174 and a second terminal connected to the anode terminal of the diode 176. The resistor 175 limits the current of the control signal S2.

[0044] The diode 176 has an anode terminal connected to the second terminal of the resistor 175 and a cathode terminal connected to the control terminal of the thyristor 11. The diode 176 outputs a control signal S1 for the thyristor 11. When the transistor 174 is in an on state, the diode 176 sets the control signal S2 to a high state (a state that sets the thyristor 11 to an on state). When the transistor 174 is in an off state, the diode 176 sets the control signal S2 to a low state (a state that sets the thyristor 11 to an off state).

[0045] Next, the operation of the power supply system 100 and the power supply device 1 according to the present embodiment will be described with reference to the drawings. 2 is a first flow chart showing an example of a power supply control process in this embodiment. In FIG. 2, a control process of the thyristor 12 by the control unit 17 will be described.

[0046] 2, the control unit 17 first determines whether or not the generated AC signal is on the positive side (step S101). The battery control unit 171 of the control unit 17 determines whether or not the AC signal output by the generator 2 is in a period of positive voltage based on the voltage of the node N2. If the generated AC signal is on the positive side (step S101: YES), the control unit 17 advances the process to step S102. If the generated AC signal is not on the positive side (is on the negative side) (step S101: NO), the control unit 17 advances the process to step S104.

[0047] In step S102, the battery control unit 171 determines whether the voltage Vcx of the capacitor 14 is equal to or higher than the threshold voltage Vth2. If the voltage Vcx of the capacitor 14 is equal to or higher than the threshold voltage Vth2 (step S102: YES), the battery control unit 171 advances the process to step S104. If the voltage Vcx of the capacitor 14 is lower than the threshold voltage Vth2 (step S102: NO), the battery control unit 171 advances the process to step S103.

[0048] In step S103, the battery control unit 171 turns the control signal S2 on. That is, the battery control unit 171 turns the control signal S2 to a high state to turn on the thyristor 12. After the process of step S103, the battery control unit 171 returns the process to step S101.

[0049] Furthermore, in step S104, the battery control unit 171 turns off the control signal S2. That is, the battery control unit 171 turns the control signal S2 to a low state to turn off the thyristor 12. After the process of step S104, the battery control unit 171 returns the process to step S101.

[0050] 3 is a second flowchart showing an example of the power supply control process in this embodiment. In FIG. 3, the control process of the thyristor 11 by the control unit 17 will be described.

[0051] 3, the control unit 17 first determines whether the generated AC signal is negative (step S201). When the voltage of the node N2 becomes a negative voltage and the diode 172 is turned on, so that the generated AC signal is negative (the voltage of the node N2 is a negative voltage) (step S201: YES), the control unit 17 proceeds to step S202. When the generated AC signal is not negative (the voltage of the node N2 is a positive voltage) (step S201: NO), the control unit 17 proceeds to step S204.

[0052] In step S202, the abnormality detection unit 16 determines whether the voltage Vcx of the capacitor 14 is equal to or greater than the threshold voltage Vth1. If the voltage Vcx of the capacitor 14 is equal to or greater than the threshold voltage Vth1 (step S202: YES), the abnormality detection unit 16 advances the process to step S204. If the voltage Vcx of the capacitor 14 is less than the threshold voltage Vth1 (step S202: NO), the abnormality detection unit 16 advances the process to step S203.

[0053] In step S203, the control unit 17 turns on the control signal S1. That is, the control unit 17 turns on the control signal S1 to a high state to turn on the thyristor 11. After the process of step S203, the control unit 17 returns the process to step S201.

[0054] Furthermore, in step S204, the control unit 17 turns off the control signal S1. That is, the control unit 17 turns the control signal S1 to a low state to turn off the thyristor 11. After the process of step S204, the control unit 17 returns the process to step S201.

[0055] Next, with reference to Figs. 4 and 5, an operation when the ground terminal T4 of the power supply device 1 according to this embodiment is in an ungrounded state will be described. FIG. 4 is a diagram for explaining an example of the operation when the ground terminal T4 of the power supply device 1 according to this embodiment is in an ungrounded state.

[0056] 4, when the ground terminal T4 is not grounded, during the period when the AC signal output by the generator 2 is negative, a current flows from the ground connected to the load units 4 and 6 to the generator 2 via the path RT1. This current charges the capacitor 14, and the voltage Vcx of the capacitor 14 with respect to the ground terminal T4 becomes a high voltage corresponding to the generated voltage.

[0057] For example, in a conventional power supply device not equipped with the abnormality detection unit of this embodiment, the voltage Vcx may rise above the withstand voltage of components such as the capacitor 14, causing damage to the components. In addition, since the voltage Vcx of the capacitor 14 (the voltage of the node N4) rises, the battery control unit 171 fixes the thyristor 12 to the off state, and the battery 3 is not charged. In this way, when the ground terminal T4 is in an ungrounded state, an operational abnormality may occur in the conventional power supply device.

[0058] In contrast, in the power supply device 1 according to this embodiment, when the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth1, the Zener diode 162 turns on and the transistor 164 turns on, causing the abnormality detection unit 16 to forcibly turn off the thyristor 11. Here, with reference to Fig. 5, the operation of the abnormality detection unit 16 and the control unit 17 when the ground terminal T4 is not grounded will be described in detail.

[0059] FIG. 5 is a timing chart for explaining an example of the operation of the abnormality detection unit 16 and the control unit 17 when the ground terminal T4 in this embodiment is in an ungrounded state. In Fig. 5, the graphs indicate, from the top, (a) the state of the AC signal, (b) the change in the capacitor voltage Vcx, and (c) the internal states of the abnormality detection unit 16 and the control unit 17. Moreover, the waveform W1 in Fig. 5(b) indicates the waveform of the capacitor voltage Vcx, and the waveform W2 in Fig. 5(c) indicates the state of the transistor 164. Moreover, the waveform W3 in Fig. 5(c) indicates the state of the transistor 174, and the waveform W4 indicates the state of the control signal S1. Moreover, the horizontal axis of each graph indicates time. Here, the capacitor voltage Vcx refers to the voltage Vcx of the capacitor 14.

[0060] During the period when the power generation AC signal is negative, in the control unit 17, the diode 172 is turned on, causing the node N5 to be in a low state and the transistor 174 to be turned on. As a result, the control unit 17 turns on the control signal S1 via the diode 176, causing the thyristor 11 to be turned on. When the ground terminal T4 is in an ungrounded state, a current flows through the path RT1 in FIG. 4 described above, and the capacitor voltage Vcx rises (see waveform W1).

[0061] At time t1, when the capacitor voltage Vcx reaches the threshold voltage Vth1, the Zener diode 162 of the abnormality detection unit 16 is turned on, turning on the transistor 164 (see waveform W2). As a result, the node N5 has the same potential as the ground terminal T4, and the transistor 174 of the control unit 17 is turned off (see waveform W3).

[0062] Furthermore, since the transistor 174 of the control unit 17 is turned off, the control unit 17 turns off the control signal S1 to turn off the thyristor 11. This stops the rise in the capacitor voltage Vcx during the period when the power generation AC signal is on the negative side.

[0063] Next, at time t2, when the generated AC signal is in the positive side period, the capacitor voltage Vcx drops due to power consumption by the load unit 4, the FI load unit 5, and the load unit 6. When the capacitor voltage Vcx becomes equal to or lower than the threshold voltage Vth2, the battery control unit 171 of the control unit 17 turns on the control signal S2 and turns on the thyristor 12 while the generated AC signal is in the positive side period. This makes it possible to charge the battery 3.

[0064] As described above, the power supply device 1 according to this embodiment is a power supply device that converts an AC signal output by the generator 2 into a DC voltage and supplies the DC voltage to the grounded load section (4, 6), and includes a thyristor 11 (first switch element), a thyristor 12 (second switch element), a control section 17, and an abnormality detection section 16. The thyristor 11 is connected between the ground terminal T4 of the power supply device 1 and the output terminal (input terminal T1) of the generator 2, and rectifies a negative side signal of the AC signal with at least an output terminal (cathode terminal) connected to the output terminal (input terminal T1) of the generator 2. The thyristor 12 rectifies a positive side signal of the AC signal with an input terminal (anode terminal) connected to the output terminal (input terminal T1) of the generator 2 and an output terminal (cathode terminal) connected to the load section (4, 6). The capacitor 14 is connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4. The control unit 17 controls the conduction of the thyristors 11 and 12 in response to switching between positive and negative AC signals. The abnormality detection unit 16 determines that the ground terminal T4 is not grounded when the voltage Vcx of the capacitor 14 becomes equal to or higher than a predetermined threshold voltage (equal to or higher than the threshold voltage Vth1), and turns off the thyristor 11.

[0065] As a result, the power supply device 1 according to this embodiment can stop charging the capacitor 14 when the ground terminal T4 is in an ungrounded state, and can prevent an abnormal voltage from being charged to the capacitor 14 via the grounded load section (4, 6) and causing an operational abnormality. Here, an operational abnormality is, for example, when the thyristor 12 goes into an off state and the battery 3 is no longer charged, or when an abnormal voltage causes a voltage exceeding the withstand voltage specification to be applied, damaging components such as the capacitor 14.

[0066] In this embodiment, the predetermined threshold voltage is a threshold voltage Vth1 (first threshold voltage). When the voltage Vcx of the capacitor 14 becomes equal to or higher than a threshold voltage Vth2 (a second threshold voltage) lower than the threshold voltage Vth1, the control unit 17 turns off the thyristor 12.

[0067] As a result, the power supply device 1 according to the present embodiment can determine that the ground terminal T4 is in an ungrounded state based on the threshold voltage Vth1 without affecting the control of the thyristor 12, and can appropriately turn the thyristor 11 off.

[0068] In this embodiment, the abnormality detection unit 16 includes a Zener diode 162 that is turned on when the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth1 (a predetermined threshold voltage or higher). When the Zener diode 162 is turned on, the abnormality detection unit 16 turns the thyristor 11 off.

[0069] As a result, the power supply device 1 according to this embodiment can easily detect, by the Zener diode 162, that the voltage Vcx of the capacitor 14 has reached or exceeded the threshold voltage Vth1, and therefore can prevent an abnormal voltage from being charged to the capacitor 14 with a simple configuration.

[0070] In addition, in this embodiment, capacitor 14 is a first capacitor, and the power supply device 1 is equipped with a capacitor 15 (second capacitor) or a resistor that is connected between the input end (anode terminal) of the thyristor 11 and the ground terminal T4 and is connected in series with capacitor 14 (first capacitor) with the ground terminal T4 as an intermediate node. As a result, the power supply device 1 according to the present embodiment can effectively utilize the negative voltage of the AC signal rectified by the thyristor 11 as a power source for the lighting device 7, for example.

[0071] The power supply control method according to the present embodiment is a power supply device 1 that converts an AC signal output by a generator 2 into a DC voltage and supplies the DC voltage to a grounded load section (4, 6), the power supply device 1 including a thyristor 11 connected between a ground terminal T4 of the power supply device 1 and an output terminal (input terminal T1) of the generator 2, at least an output terminal (cathode terminal) of which is connected to the output terminal (input terminal T1) of the generator 2, for rectifying a negative signal of the AC signal, a thyristor 12 whose input terminal (anode terminal) is connected to the output terminal (input terminal T1) of the generator 2 and whose output terminal (cathode terminal) is connected to the load section (4, 6), for rectifying a positive signal of the AC signal, and a capacitor 14 connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4, and includes a control step and an abnormality detection step. In the control step, a control section 17 controls the conduction of the thyristor 11 and the thyristor 12 in response to switching between the positive and negative of the AC signal. In the abnormality detection step, when the voltage Vcx of the capacitor 14 based on the ground terminal T4 becomes equal to or higher than the threshold voltage Vth1 (above a predetermined threshold voltage), the abnormality detection unit 16 determines that the ground terminal T4 is in an ungrounded state and turns off the thyristor 11. As a result, the power supply control method according to this embodiment has the same effect as the power supply device 1 described above, and can prevent abnormal voltage from being charged to the capacitor 14 via the grounded load section (4, 6), causing operational abnormalities.

[0072] [Second embodiment] Next, a power supply system 100a and a power supply device 1a according to a second embodiment will be described with reference to FIG. FIG. 6 is a block diagram showing an example of a power supply system 100a and a power supply device 1a according to the second embodiment.

[0073] As shown in FIG. 6, the power supply system 100a is a system mounted on a vehicle such as a motorcycle, and includes a power supply device 1a, a generator 2, a battery 3, an FI load unit 5, load units (4, 6), and a lighting device 7. In FIG. 6, the same components as those in FIG. 1 are given the same reference numerals, and the description thereof will be omitted.

[0074] The power supply device 1a half-wave rectifies the AC power generated by the generator 2 to charge the battery 3 and supply DC power to the load unit 4. In addition, the power supply device 1a is connected to an FI load unit 5 and load units (4, 6), and supplies the power generated by the generator 2 or the output power of the battery 3 to the FI load unit 5 and the load units (4, 6).

[0075] The power supply device 1a includes an input terminal T1, a battery terminal T2, a ground terminal T4, an LA terminal T5, and an LK terminal T6. In this embodiment, the power supply device 1a is different from the first embodiment in that it does not include an output terminal T3. Therefore, the battery terminal T2 is connected to a battery 3 and a load unit 4, and an FI load unit 5 and a load unit 6.

[0076] The power supply device 1a also includes a thyristor 11, a thyristor 12, a capacitor 14, a capacitor 15, an abnormality detection unit 16, and a control unit 17. In this embodiment, the power supply device 1a differs from the first embodiment in that it does not include a diode 13. Therefore, the cathode terminal (node ​​N3) of the thyristor 12 and one end (node ​​N4) of the capacitor 14 are directly connected.

[0077] As described above, the power supply device 1a according to this embodiment does not include the diode 13, and the capacitor 14 is connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4. The other configurations are the same as those of the power supply device 1 according to the first embodiment.

[0078] Moreover, the operation of the power supply device 1a according to this embodiment is similar to that of the first embodiment described above, and therefore a description thereof will be omitted here.

[0079] As described above, the power supply device 1a according to this embodiment includes the thyristor 11, the thyristor 12, the capacitor 14, the abnormality detection unit 16, and the control unit 17, similar to the power supply device according to the first embodiment.

[0080] As a result, the power supply device 1a of this embodiment has the same effect as the power supply device 1 of the first embodiment, and can prevent abnormal voltage from being charged to the capacitor 14 via the grounded load section (4, 6), causing operational abnormalities.

[0081] [Third embodiment] Next, a power supply system 100b and a power supply device 1b according to a third embodiment will be described with reference to FIG. FIG. 7 is a block diagram showing an example of a power supply system 100b and a power supply device 1b according to the third embodiment.

[0082] As shown in FIG. 7, the power supply system 100b is a system mounted on a vehicle such as a motorcycle, and includes a power supply device 1b, a generator 2, a battery 3, an FI load unit 5, load units (4, 6), and a lighting device 7. In FIG. 7, the same components as those in FIG. 1 are given the same reference numerals, and the description thereof will be omitted.

[0083] The power supply device 1b includes an input terminal T1, a battery terminal T2, an output terminal T3, a ground terminal T4, an LA terminal T5, and an LK terminal T6. The power supply device 1b further includes a thyristor 11, a thyristor 12, a diode 13, a capacitor 14, a capacitor 15, an abnormality detection unit 16, a control unit 17, and a capacitor 18.

[0084] This embodiment differs from the first embodiment in that the power supply device 1b includes a capacitor . The capacitor 18 is connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4. The capacitor 18 has a first terminal connected to the cathode terminal (node ​​N3) of the thyristor 12 and a second terminal connected to the ground terminal T4.

[0085] In this embodiment, the capacitor 14 and the capacitor 18 each correspond to a first capacitor connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4.

[0086] Moreover, the operation of the power supply device 1b according to this embodiment is similar to that of the first embodiment described above, and therefore a description thereof will be omitted here.

[0087] As described above, the power supply device 1b according to this embodiment includes the thyristor 11, the thyristor 12, the capacitor 14, the abnormality detection unit 16, the control unit 17, and the capacitor 18. The capacitor 18 is connected between the output terminal (cathode terminal) of the thyristor 12 and the ground terminal T4.

[0088] As a result, the power supply device 1b of this embodiment has the same effect as the power supply device 1 of the first embodiment, and can prevent abnormal voltages from being charged to the capacitors 14 and 18 via the grounded load sections (4, 6), which would cause operational abnormalities.

[0089] The present invention is not limited to the above-described embodiments, and can be modified without departing from the spirit of the present invention. For example, in each of the above embodiments, the switching elements are described as being thyristors 11 and 12, but the present invention is not limited to this and may be other switching elements such as MOS (Metal-Oxide-Semiconductor) transistors, IGBTs (Insulated Gate Bipolar Transistors), and other silicon controlled rectifiers.

[0090] In each of the above embodiments, the configurations of the abnormality detection unit 16 and the control unit 17 are not limited to the circuits shown in FIG. 1, and may be other configurations (circuits). For example, the abnormality detection unit 16 and the control unit 17 may be realized by software processing that includes a CPU (Central Processing Unit) and causes the CPU to execute a program.

[0091] In the above third embodiment, an example has been described in which the abnormality detection unit 16 determines that the ground terminal T4 is not grounded and turns off the thyristor 11 when the voltage Vcx of the capacitor 14 becomes equal to or higher than the threshold voltage Vth1, but the present invention is not limited to this. The abnormality detection unit 16 may determine that the ground terminal T4 is not grounded and turn off the thyristor 11 when the voltage of the capacitor 18 (the voltage of the node N3 with respect to the ground terminal T4) becomes equal to or higher than the threshold voltage Vth1 instead of the voltage Vcx of the capacitor 14.

[0092] The abnormality detection unit 16 and the control unit 17 each have a computer system therein. The processing steps of the abnormality detection unit 16 and the control unit 17 are stored in a computer-readable recording medium in the form of a program, and the computer reads and executes this program to perform the above processing. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, etc. Also, the computer program may be distributed to a computer via a communication line, and the computer that receives the program may execute the program. [Explanation of symbols]

[0093] 1, 1a, 1b power supply 2. Generator 3 Battery 4, 6 Load section 5 FI load section 7 Lighting equipment 7A, 7B Light-emitting diodes 11, 12 Thyristor 13, 161, 172, 176 Diodes 14, 15, 18 Capacitors 16 Abnormality detection section 17 Control Unit 100, 100a, 100b Power Systems 162 Zener Diode 163, 173, 175 Resistance 164, 174 transistors 171 Battery control unit T1 input terminal T2 Battery Terminal T3 output terminal T4 ground terminal T5 LA terminal T6 LK terminal

Claims

1. A power supply device that converts an AC signal output by a generator into a DC voltage and supplies the DC voltage to a grounded load, a first switch element that is connected between a ground terminal of the power supply device and an output terminal of the generator, and at least an output terminal of the first switch element is connected to the output terminal of the generator, and that rectifies a negative side signal of the AC signal; a second switch element having an input terminal connected to an output terminal of the generator and an output terminal connected to the load, the second switch element rectifying a positive side signal of the AC signal; a capacitor connected between an output terminal of the second switch element and the ground terminal; a control unit that controls conduction of the first switch element and the second switch element in response to switching of the positive and negative of the AC signal; an abnormality detection unit that determines that the ground terminal is not grounded when the voltage of the capacitor becomes equal to or higher than a predetermined threshold voltage and turns off the first switch element; A power supply device comprising:

2. the predetermined threshold voltage is a first threshold voltage; The control unit turns the second switch element to an off state when the voltage of the capacitor becomes equal to or higher than a second threshold voltage that is lower than the first threshold voltage.

2. The power supply device according to claim 1 .

3. The abnormality detection unit includes a Zener diode that is turned on when the voltage of the capacitor becomes equal to or higher than the predetermined threshold voltage, and turns the first switch element off when the Zener diode is turned on.

3. The power supply device according to claim 1 or 2.

4. the capacitor is a first capacitor, a second capacitor or resistor connected between the input terminal of the first switch element and the ground terminal and connected in series with the first capacitor with the ground terminal serving as an intermediate node; The power supply device according to any one of claims 1 to 3.

5. A power supply device that converts an AC signal output by a generator into a DC voltage and supplies the DC voltage to a grounded load, the power supply device comprising: a first switch element that is connected between a ground terminal of the power supply device and an output terminal of the generator, and at least an output terminal of the first switch element is connected to the output terminal of the generator, and that rectifies a negative signal of the AC signal; a second switch element that has an input terminal connected to the output terminal of the generator and an output terminal of a second switch element connected to the load, and that rectifies a positive signal of the AC signal; and a capacitor connected between the output terminal of the second switch element and the ground terminal, a control step of controlling the first switch element and the second switch element in response to switching of the positive and negative of the AC signal by a control unit; an abnormality detection step in which an abnormality detection unit determines that the ground terminal is not grounded when the voltage of the capacitor with respect to the ground terminal becomes equal to or higher than a predetermined threshold voltage, and turns off the first switch element; A power supply control method comprising:

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