Battery charging device, battery charging circuit, and semiconductor integrated circuit device

Abstract

The control circuit prevents malfunctions caused by noise generated when a switch element corresponding to a predetermined phase is turned off, which is superimposed on the output voltage of the other phases input to the control circuit. [Solution] The control circuit takes the three-phase power output of a three-phase AC generator as input and controls the corresponding switch element of the three-phase full-wave rectifier circuit for each phase of the three-phase power output to charge the battery. The malfunction prevention circuit 60, after detecting the zero-crossing of the rising edge of the power output voltage of its own phase in the filter control circuit 62, disables the AND circuits 64U, 64V, and 64W for filtering its own phase and the other two phases for a predetermined time, thereby preventing the transmission of control signals to the output side. This prevents malfunctions caused by output noise generated when a switch element of one phase is switched from on to off being transmitted to the inputs of the other two phases.

Description

Technical Field

[0001] The present invention relates to battery charging technology, and particularly to a battery charging device for a two-wheeled vehicle, a battery charging circuit, and a semiconductor integrated circuit device for battery charging control.

Background Art

[0002] Conventionally, various battery charging devices for two-wheeled vehicles have been proposed. For example, in the battery charging device of Patent Document 1, the battery charging voltage is controlled by synchronous rectification, and in order to prevent the phase voltage from becoming unbalanced due to the transition between the charging state and the non-charging state occurring in a short time and the battery charging efficiency from decreasing, a method of holding the charging state and the non-charging state for an arbitrary period is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the battery charging device of Patent Document 1, in a battery charging device that inputs the output of a permanent magnet type three-phase AC generator and charges the battery with a DC voltage rectified by a three-phase full-wave rectifier circuit, charging control is performed by a control circuit composed of a group of diodes (rectifier element group) connected to the plus side and a group of FETs (switch element group) connected to the minus side of the three-phase full-wave rectifier circuit.

[0005] ​​​​​​​​​The control circuit's charge control is zero at the rising edge when the AC input voltage rises from negative to positive. The crossover is detected as the timing for synchronous rectification, and the gate signal of each FET is set to a low level. This turns it off and charges the battery. Also, the falling edge of the AC input voltage, which goes from positive to negative. By detecting a zero-crossing at the edge and setting the gate signal of each FET to a high level, it turns on. This is a three-phase full-wave rectification charge control that recirculates the battery to the generator to prevent charging, so-called three-phase 1 We are implementing synchronous rectification control for electric vehicles.

[0006] Here, the semiconductor integrated circuit device that constitutes the control circuit of the battery charging device includes a bipod. There are two configurations: a standard configuration and a CMOS configuration. The bipolar configuration has a small offset and a simpler circuit. While this has advantages, the increased circuit area makes the wafer process more expensive. There are advantages. In contrast, the CMOS configuration has the disadvantage of a larger offset. However, the smaller circuit area has the advantage of making wafer processing cheaper. Therefore, a CMOS-based control circuit is employed.

[0007] However, in a control circuit that performs three-phase one-cycle synchronous rectification control, a predetermined one phase The zero-crossing of the rising edge where the output voltage changes from negative to positive is detected. The timing of switching a switch element corresponding to a predetermined phase of a group of switch elements from on to off. Noise is easily generated during the raging process, and this generated noise is transmitted to the other two-phase input terminals, which then powers the system. It superimposes on the output voltage and incorrectly turns on the switch elements corresponding to the other two phases of the switch element group. This may cause malfunctions.

[0008] This invention relates to a control circuit that generates a signal when a switch element corresponding to a predetermined phase is turned off. It is possible to prevent malfunction that occurs when noise is superimposed on the generated output voltage of the other phase input to the control circuit An object of the present invention is to provide a battery charging device, a battery charging circuit, and a semiconductor integrated circuit device for this purpose

Means for Solving the Problem

[0009] (Battery Charging Device) The present invention is a battery charging device that charges a battery with a DC voltage rectified by a rectification circuit including a rectifier element group and a switch element group, taking the output of an AC power source as an input, and includes a control circuit that controls corresponding switch elements in the switch element group for each phase of the output of the AC power source, where the control circuit includes a malfunction prevention circuit that prevents malfunction caused by output noise generated when switching a switch element corresponding to a predetermined phase from on to off being transmitted to the input of the other phase and is characterized by this

[0010] (Control Circuit: Zero-Cross Detection of Rising Edge) The control circuit includes a zero-cross detection circuit that detects the zero-cross of the rising edge from negative to positive of the output voltage for each phase of the AC power source, a charging control circuit that switches the switch element from on to off when detecting the zero-cross of the rising edge and charges the battery with the DC voltage rectified by the rectifier element group, and is characterized by this The malfunction prevention circuit includes a filter circuit that prohibits propagation to the output side of a control signal including noise from other phases, and a filter control circuit that releases the mask of the filter circuit to prohibit the propagation of the control signal for a predetermined time after detecting the zero-cross of the rising edge of the output voltage of the other phase and is characterized by this

[0011] ​​​​​​(Control Circuit: Zero-Cross Detection of Falling Edge) For the control circuit, the zero-cross detection circuit detects the zero-cross of the falling edge from positive to negative of the output voltage for each phase of the AC power supply, and when the charging control circuit detects the zero-cross of the falling edge, it switches the switching element off or on to reflux the battery to the AC power supply, and the filter control circuit masks the filter circuit for a predetermined time after detecting the zero-cross of the falling edge of the output voltage of the other phase by the zero-cross detection circuit to allow the transmission of the control signal.

[0012] (Battery Charging Circuit) Furthermore, the present invention is a battery charging circuit that charges a battery with a DC voltage rectified by a rectifier circuit including a rectifier element group and a switching element group, taking the output of an AC power supply as an input, and is characterized by including a control circuit that controls corresponding switching elements in the switching element group for each phase of the AC power supply, and the control circuit includes a malfunction prevention circuit that prevents malfunction caused by the transmission of output noise generated when switching the switching element corresponding to a predetermined phase from on to off to the input of the other phase. In this case, the control circuit is the same as that in the case of the battery charging device described above.

[0013] (Semiconductor Integrated Circuit Device) Furthermore, the present invention is a semiconductor integrated circuit device including a control circuit for controlling a switching element group for each phase of an AC power supply so as to charge a battery with a DC voltage rectified by a rectifier circuit including a rectifier element group and a switching element group, taking the output of the AC power supply as an input, and the control circuit is characterized by including, for each phase of the AC power supply, a control circuit that controls the switching element group so as to charge the battery with the DC voltage rectified by the rectifier circuit, and when switching the switching element corresponding to a predetermined phase from on to off, the control circuit generates ​​​​This malfunction prevention circuit prevents malfunctions caused by the transmission of output noise to the input of other phases. It is characterized by the following. The control circuit in this case is the same as that of the battery charging device described above. ru. [Effects of the Invention]

[0014] (Effects of battery charging device) This invention provides a rectifier that takes the output of an AC power supply as input and comprises a group of rectifier elements and a group of switching elements. A battery charging device that charges a battery using a DC voltage rectified by a current circuit, A control circuit is provided to control the corresponding switch element in the group of switch elements for each phase of the AC power supply. The control circuit is equipped with a switch element corresponding to a predetermined phase, and when it switches the switch element from on to off, A malfunction prevention circuit prevents malfunctions caused by output noise being transmitted to the input of other phases. Because it is equipped with a path, when the switch element corresponding to a predetermined phase is switched from on to off, The generated output noise is transmitted to the input of the other phase, causing the switches of the switching elements in the full-wave rectifier circuit to... This system reliably prevents malfunctions that accidentally turn on the choke element, ensuring stable multi-phase 1-cycle synchronous rectification control. To make it possible.

[0015] (Effect of the control circuit that supports zero-crossing detection of rising edges) Furthermore, the control circuit detects the zero-point change in the rising edge of the output voltage of each phase of the AC power supply from negative to positive. A zero-cross detection circuit detects loss, and when a zero-cross on a rising edge is detected, Switching the switch element from on to off, the DC voltage rectified by the rectifier elements powers the battery. The system includes a charging control circuit for charging the battery, and a malfunction prevention circuit that includes noise from other phases. A filter circuit that prevents the propagation of control signals to the output side, and the rising edge of the output voltage of the other phase. After detecting a zero-crossing, the filter circuit mask is released for a predetermined time to control the signal. Because it is equipped with a filter control circuit that prohibits the propagation of signals, the rising edge of a predetermined single-phase control signal If an edge zero-crossing is detected, the noise is superimposed on other phases for a predetermined period of time. By filtering the control signal and preventing its propagation to the output side, it corresponds to a predetermined single phase. Noise from one phase causes a malfunction in which the switching element of the rectifier circuit of the other phase is mistakenly turned on. It is indeed preventable.

[0016] (Effect of the control circuit that supports zero-crossing detection on falling edges) Furthermore, the zero-crossing detection circuit of the control circuit detects the phase-specific output voltage of the AC power supply from positive to negative. The charging control circuit detects the zero-crossing of the falling edge and When detected, the switch element is switched from off to on to return the battery to the AC power source. The filter control circuit then detects the falling edge of the output voltage of the other phase using a zero-crossing detection circuit. After detecting the zero-crossing, the filter circuit is masked for a predetermined time to transmit the control signal. Because the system is designed to allow movement, it detects the zero-crossing of the falling edge of a predetermined single-phase control signal. If this signal is transmitted, it masks the filter circuit of the other phase and allows the control signal to propagate to the output side. .

[0017] Furthermore, the battery charging circuit and semiconductor integrated circuit device of the present invention also relate to the aforementioned battery This device provides the same effect as a tere charging device. [Brief explanation of the drawing]

[0018] [Figure 1] This is an explanatory diagram showing the configuration of a battery charging device. [Figure 2] This is a time chart showing an example of the voltage waveform when a battery charging device is in a charging state. [Figure 3] This is a time chart diagram showing examples of voltage waveforms in the charged and uncharged states of a battery charging device. [Figure 4] This is an explanatory diagram showing the circuit configuration of the control circuit of a battery charging device. [Figure 5] This is an explanatory diagram showing the setting and operation of the reference voltage of a comparator using a ground-connected power supply. [Figure 6] This is a time chart showing the signal waveforms of the malfunction prevention circuit. [Figure 7] This is an explanatory diagram showing the circuit configuration of the filter control circuit. [Figure 8] This is a time chart showing edge mask signals and filter control signals based on zero-crossing detection of control signals containing noise. [Figure 9] This is a time chart showing examples of three-phase input voltage, three-phase gate signal, and three-phase filter control signal, including noise, in the charging state of a battery charging device. [Modes for carrying out the invention]

[0019] The following describes the battery charging device, battery charging circuit, and semiconductor integrated device according to the present invention. The implementation will be described in detail based on the drawings. Note that the present invention is not limited to the following embodiments. It is not something that should be done.

[0020] [Basic Concepts of the Embodiment] First, the basic concept of the embodiment will be explained. The embodiment is, in general terms, an AC power supply This relates to a battery charging device that rectifies the output to a DC voltage using a rectifier circuit to charge the battery. More specifically, it involves full-wave rectification of the three-phase power output of a permanent magnet type three-phase AC generator. This relates to a battery charging device that rectifies the current into a DC voltage using a current circuit to charge the battery. be.

[0021] Here, a "permanent magnet type three-phase AC generator" is a generator driven by the rotation of a motorcycle engine. The stator has a coil of three-phase windings arranged inside the stator yoke, and the N pole is located inside the stator. It consists of a rotor in which an even number of permanent magnets are arranged so that the polar or south poles repel each other, and is fixed The rotor rotates at the center of the motor to generate electricity, outputting three-phase alternating current power.

[0022] Furthermore, a "full-wave rectifier circuit" takes the three-phase power output of a three-phase AC generator as input, and the positive side... It comprises a group of rectifier elements connected to the negative side and a group of switch elements connected to the negative side, and is a full-wave rectifier. It charges the battery by outputting the DC voltage that is supplied.

[0023] Furthermore, the "rectifier element group" is connected to each of the three phase lines on the positive side of the full-wave rectifier circuit. It is a collection of rectifier elements, and its configuration and type are arbitrary, but as a power semiconductor, An diode, such as a Schottky barrier diode or equivalent, is used. be.

[0024] Furthermore, the "switch element group" is connected to each of the three phase lines on the negative side of the full-wave rectifier circuit. It is a collection of connected switching elements, and its configuration and type are arbitrary, but power semiconductor FETs or equivalent components are used as such.

[0025] Furthermore, the battery charging device of the embodiment has a group of switch elements for each phase of the three-phase power output. It is equipped with a control circuit that controls the corresponding switch element, and the positive terminal of the battery is connected to the power supply. Connect to the input and connect the negative terminal of the battery to the ground line. Ground connection power supply. It operates on [this].

[0026] Here, the "control circuit" controls the output voltage of each phase of the three-phase power generation output from negative to positive. The zero-crossing at the rising edge (positive edge) is used as the timing for synchronous rectification. By setting the gate signal of the FET to a low level, it is turned off to charge the battery, and also, Detects zero-crossing at the falling edge (negative edge) where the power generation output voltage drops from positive to negative. By setting the gate signal of the FET to a high level, it is turned on and the battery is connected to a three-phase AC generator. This system performs synchronous rectification control that recirculates current to prevent charging, also known as three-phase one-cycle synchronous rectification control. be.

[0027] Furthermore, "H level" refers to one level of a binary logic signal, meaning high level. This includes concepts such as "L," "high potential," and "1." Furthermore, "L level" refers to the other level of a binary logic signal. This refers to a level, and includes concepts such as low level, low potential, and "0".

[0028] The "control circuit" of the embodiment includes a switch element corresponding to a predetermined phase, for example, a U-phase switch. The output noise generated when switching a switch element from on to off affects the other two phases, for example, the V phase. It is equipped with a malfunction prevention circuit to prevent malfunctions that occur when the signal is transmitted to the W-phase input. .

[0029] Here, "malfunction" refers to a situation where the input generated voltage of a predetermined phase, for example, the U-phase, changes from negative to positive. Detecting the zero-crossing at the rising edge when it changes to a raspy state switches the U-phase of the full-wave rectifier circuit. Noise is likely to occur at the timing when the element is switched from on to off, and the generated noise This is transmitted to the input terminals of the other two phases, the V phase and the W phase, and superimposed on the generated output voltage, and full wave rectification is performed. This refers to a malfunction in which the V-phase and W-phase switching elements of a current circuit are mistakenly turned on.

[0030] Therefore, a malfunction prevention circuit switches the switch element corresponding to a predetermined phase from ON to OFF. The output noise generated when switching to the F-mode is transmitted to the other two-phase inputs, affecting the full-wave rectifier circuit. This system reliably prevents accidental switching on of the switch element and ensures stable three-phase one-cycle synchronization. This enables rectification control.

[0031] Furthermore, the control circuit includes a zero-cross detection circuit and a charging control circuit, and the malfunction prevention circuit is It comprises a filter circuit and a filter control circuit.

[0032] Here, the "zero-crossing detection circuit" is the phase of the three-phase power output input from the three-phase AC generator. Zero crossing or This circuit detects the zero-crossing of the rising edge (positive edge) that changes from negative to positive. For example, a reference voltage -Vref for detecting the zero-crossing of the negative edge and the positive edge A comparator circuit is used to switch the reference voltage +Vref for detecting zero crossings. ru.

[0033] Furthermore, the "charging control circuit" detects the zero-crossing of the rising edge of the power generation output voltage. In this case, the switch element is switched from on to off, and the DC voltage rectified by the rectifier element is used The battery is charged, and the switch element is turned off when a falling edge zero crossing is detected. This circuit switches on to return the battery power to the three-phase AC generator.

[0034] Furthermore, the "filter circuit" prevents the transmission of control signals containing noise from other phases to the output side. This is a circuit that stops the signal, and an AND circuit that functions as a filter is provided for each phase.

[0035] Furthermore, the "filter control circuit" detects the falling edge of the power output voltage of the other phase using a zero-crossing detection circuit. After detecting an edge zero-crossing, the filter circuit is masked for a predetermined time to control the signal. Allow the propagation of the signal, and after detecting the zero-crossing of the rising edge of the power output voltage of the other phase, The filter circuit's mask is released for a set period of time to prevent the propagation of control signals containing noise. It is a circuit.

[0036] Therefore, if a zero-crossing occurs on the falling edge of a predetermined single-phase power output voltage, The other two phases mask the filter circuit, allowing the control signal to propagate to the output side, but If a zero-crossing occurs at the rising edge of the output voltage of one phase, the other two phases will... During a predetermined period while the signal is superimposed, a filter is applied to the control signal to prevent its propagation to the output side. By stopping this, noise from other phases will not accidentally turn on the switching element of the full-wave rectifier circuit. This ensures that malfunctions can be reliably prevented.

[0037] Furthermore, the battery charging circuit and semiconductor integrated circuit device of the embodiment are used for the aforementioned battery charging It possesses essentially the same characteristics as an electrical device.

[0038] The following describes specific embodiments in detail, using a "battery charging device" as an example. The content will be explained in the following sections.

[0039] a. Overview of the battery charging device b. Charging control c. Circuit configuration d. Configuration of the malfunction prevention circuit d1. Noise generation and malfunction prevention function d2. Filter control circuit d3. Operation of the filter control circuit e. Semiconductor integrated circuit equipment f. Modified versions of the present invention

[0040] [a. Overview of Battery Charging Devices] This section will explain the overview of the battery charging device. Refer to Figure 1, which shows the configuration.

[0041] As shown in Figure 1, the battery charging device of this embodiment is a permanent magnet type three-phase AC generator The three-phase power outputs U, V, and W of 10 are input, and the DC power is rectified by the three-phase full-wave rectifier circuit 12. The voltage charges the battery 14 via the fuse 18 and supplies DC power to the load 16. It operates using a three-phase full-wave rectifier circuit 12 and a control circuit 20.

[0042] The three-phase full-wave rectifier circuit 12 takes the three-phase output of the three-phase AC generator 10 as input and converts it to a DC voltage. This is a rectifier circuit. The three-phase full-wave rectifier circuit 12 has a group of rectifier elements 22 connected to the positive side. It consists of a group of switch elements 24 connected to the negative side.

[0043] The rectifier element group 22 has rectifier elements 2210, 2212, and 2214 connected to each phase. The configuration and type of rectifier elements 2210, 2212, and 2214 are arbitrary, but this is an example of a rectifier element. It uses a Schottky barrier diode or equivalent, and is intended for power supply use. It is used as a diode, a power semiconductor.

[0044] Furthermore, the switching element group 24 has FET2410,2 as an example of a switching element for each phase. 412 and 2414 are connected, and since they are used for power supply, they are FETs, which are power semiconductors. That is what they say.

[0045] The control circuit 20 uses the DC voltage rectified by the three-phase full-wave rectifier circuit 12 to power the battery 14. When charging, the FETs 2410, 2412, and 2414 of the switch element group 24 are controlled. This is the circuit. The control circuit 20 also connects the positive terminal of the battery 14 to the power line 26. Next, the negative terminal of battery 14 is connected to ground line 28, creating a grounded power supply. It operates on [this].

[0046] [b. Charge control] Next, the charging control by the control circuit 20 will be explained. In this explanation, the battery Figure 2 is a time chart showing an example of the voltage waveform in the charging state of the recharger, and the battery This is a time chart showing examples of voltage waveforms in the charged and uncharged states of a tere charging device. Refer to Figure 3.

[0047] In controlling the charging state of the battery charging device shown in Figure 2, for example, the U-phase input voltage E Taking 1 as an example, the rising edge of the U-phase input voltage E1 when it rises from negative to positive, for example, at time t1. The zero-crossing at the edge is detected as the timing for synchronous rectification, and the U-phase gate of the FET2410 is used. By changing the signal E10 from a high level to a low level, the FET2410 is turned off, and rectification... The current is rectified by element 2210 and the battery 14 is charged.

[0048] Next, the zero-point at the falling edge of the U-phase input voltage E1 at time t2 when it falls from positive to negative. The system detects the loss and changes the U-phase gate signal E10 of the FET2410 from a low level to a high level. This turns on the FET2410 and returns the battery 14 to the three-phase AC generator 10, thus preventing the non- Charge.

[0049] The same applies to the V-phase input voltage E2 and W-phase input voltage E3, and the rising edge is zero. The crossover is detected, FET2412 and 2414 are turned off, and battery 14 is charged, and then... Then, by detecting the zero-crossing of the falling edge, FETs 2412 and 2414 are turned on to decharge. The system repeatedly uses electric control.

[0050] Figure 3 shows the case where the device remains in a charging state for a long time and then becomes uncharged for a short time, with the power supply voltage V CC (battery voltage) is below a steady voltage of 14 volts before time t11 and after time t13. The voltage drops to a charging state, and then becomes non-charging when it rises above the steady-state voltage between times t11 and t12. This is the current state.

[0051] If the power supply voltage VCC is less than 14 volts steady voltage up to time t11, Similar to the charging control shown in Figure 2, the rising edges of the U, V, and W phase input voltages cross zero. Detecting this, the gate signals E10, E20, and E30 are set to L level, and FET2410, 24 The control repeatedly turns off 12,2414 and charges battery 14.

[0052] When the power supply voltage VCC increases above the steady-state voltage at time t11, the U, V, and W phase input voltages Even if a zero-crossing of the rising edge is detected, the gate signals E10, E20, and E30 will not be set to L level. Without doing so, maintain the H level and turn on FET2410,2412,2414 The control system prevents the battery 14 from being charged, which reduces the power supply voltage VCC, which had been increasing. At time t12, the voltage falls below the steady state.

[0053] However, even if the power supply voltage VCC falls below the steady-state voltage at time t12, the gate signal E 10, E20, E30 remain at the H level for a predetermined period of time, which constitutes a half-cycle, indicating a non-charged state. After maintaining the state, the charging state is established, and the power supply voltage VCC increases from time t13.

[0054] If a non-charging state occurs for a short period of time while the device is charging, the non-charging state may be changed to a specified period. By holding the battery in place, the phase voltage of the three-phase AC generator 10 becomes unbalanced, which improves battery charging efficiency. This prevents the value from decreasing. Also, in cases where a charging state occurs for a short time while the device is not charging. In addition, by maintaining the charged state for an arbitrary period of time, the phase voltage of the three-phase AC generator 10 becomes amber This prevents the battery charging efficiency from decreasing due to lance interference.

[0055] [c. Configuration of the control circuit] Next, the configuration of the control circuit will be explained. In this explanation, the battery charging device will be described. Figure 4 shows the circuit configuration of the control circuit, and the reference power supply of the comparator using a ground-connected power supply. Refer to Figure 5, which shows the pressure settings and operation.

[0056] As shown in Figure 4, the charge control circuit system is configured to correspond to the U, V, and W phases, respectively. It is divided into an input circuit section 35, a charging control section 36, and an output circuit section 37.

[0057] Here, taking the U-phase circuit system as an example, between input terminal 30U and output terminal 54U, Comparator 32U, Inverter 38U, Positive Edge One Shot 40U, Negative Edge One-shot 42U, AND gate 44U, latch gate 46U, NOR gate 48U, A bell shift circuit section 50U and a driver circuit 52U are provided. Here, "one shot" " is an abbreviation for "One-Shot Multi-Vibrator". The same applies to the V-phase and W-phase. .

[0058] Additionally, there are negative edge one-shot 42U, 42V, 42W and AND gate 44U, 44V. A malfunction prevention circuit 60 is provided between 44W and . The malfunction prevention circuit 60 is a filter It consists of a control circuit 62 and filter AND circuits 64U, 64V, 64W. On the power terminal 30U, 30V, 30W side, there is a Zener diode 78U, 7 for noise suppression. 8V and 78W outputs are provided, and the 54U, 54V, and 54W output terminals also have noise suppression features. A diode with voltages of 80U, 80V, and 80W is provided.

[0059] To explain using the U-phase circuit system as an example, the input terminal 30U has the permanent magnet shown in Figure 1. The U-phase input voltage E1 from the stone-type three-phase AC generator 10 is input as the control signal.

[0060] Comparator 32U performs zero-crossing of the falling and rising edges of the input control signal. The timing is detected, and the level changes from H level to L level upon zero-crossing detection of the rising edge. It outputs a control signal, and changes from L level to H level upon zero-crossing detection of the falling edge. It outputs a control signal.

[0061] Therefore, the positive terminal of comparator 32U receives a control signal that is the U-phase input voltage E1 voltage. A reference voltage is input to the negative terminal to detect the zero-crossing timing. The reference voltage is the reference voltage +V used to detect the zero-crossing of the rising edge of the control signal. A reference voltage -Vref is provided to detect the zero-crossing of the falling edge of the control signal. Furthermore, the comparator 32U can be selectively set by the switching circuit 34U.

[0062] Here, since the control circuit 20 is operating with a ground-connected power supply, comparator 32 The reference voltages +Vref and -Vref for U are set as shown in Figure 5.

[0063] As shown in Figure 5, for comparator 32U, the ground voltage is 0 volts. A constant voltage is defined as a higher voltage, for example, 1.0 volts, and relative to 0 volts, for example... +10 millivolts and a higher reference voltage +Vref and -10 millivolts and a lower reference voltage -Vr ef is set, and therefore the reference voltage + Vref is 1.01 volts (= 1.0 volts). The reference voltage -Vref is set to 0.99 volts (=1.0) and the reference voltage -Vref is set to 0.99 volts (=1.0 The bolt is set to a 10mm bolt.

[0064] The operation of comparator 32U is determined by the falling edge of the input control signal (U-phase input voltage) E1. When the reference voltage +Vref, which is the negative edge zero-cross detection point 90, is reached, the comparator The - output inverts from a high level to a low level, and consequently the negative of comparator 32U The input reference voltage to the input terminal instantly changes from reference voltage +Vref to reference voltage -Vref. It can be switched.

[0065] Next, the rising edge of the input control signal (U-phase input voltage) E1 crosses the positive edge zero. When the reference voltage -Vref, which is the detection point 92, is reached, is the comparator output at an L level? The signal is then inverted to an H level, and consequently, the input to the negative input terminal of comparator 32U The reference voltage can be instantly switched from reference voltage -Vref to reference voltage +Vref.

[0066] Referring again to Figure 4, the output of comparator 32U is positive via inverter 38U The input is set to Edge One Shot 40U and Negative Edge One Shot 42U. The Edge One Shot 40U is a comparator for zero-crossing detection of the rising edge of a control signal. It operates on the output and outputs a one-shot signal that maintains a high level for a predetermined period. Negative Edge One Shot 42U operates on the comparator output for zero-crossing detection of the falling edge of the control signal. It generates a one-shot signal that is kept at an L level for a predetermined period of time.

[0067] The one-shot signal from the negative edge one-shot 42U is transmitted via the AND circuit 44U. The set signal is input to the latch circuit 46U, and the set operation raises the latch output to a high level. The one-shot signal from the positive edge one-shot 40U is then relayed to the latch circuit 46U. It is input as a set signal, and the latch output is set to L level by the reset operation. AND The circuit 44U has a charge enable signal E7 input, and the charge enable signal E7 is the power supply voltage VC. When C is within a predetermined starting voltage range, for example, between 0.3 and 30 volts, it becomes H level. The AND circuit 44U is set to an acceptable state.

[0068] The control signal from the latch circuit 46U is transmitted to the level shift circuit section 5 via the NOR circuit 48U. Input to 0U, the driver circuit 52 performs a level shift that increases the voltage to a predetermined level. The input to U is transmitted from the driver circuit 52U through the output terminal 54U to the U-phase shown in Figure 1. The U-phase gate signal E10 is output to the FET2410.

[0069] Since the control circuits for the V-phase and W-phase are the same as those for the U-phase control circuit described above, I will omit that explanation.

[0070] Furthermore, the control circuit is provided with a low voltage detection circuit 56. The low voltage detection circuit 56 is powered by a power supply. It takes a voltage VCC as input and outputs a reset signal E4 corresponding to the low voltage state. Specifically, A rise-off reference voltage and a fall-off reference voltage with hysteresis are set, and the power supply voltage VC If C is below the reference voltage, the reset signal E4 is set to the H level by low voltage detection, and the power supply The reset signal E4 is set to L level when the voltage VCC is equal to or greater than the reference voltage. Power supply voltage V If the steady-state voltage of CC is set to 14 volts, the rising and falling reference voltages can be set arbitrarily. However, if the rising reference voltage is set to 8 volts and the falling reference voltage is set to 7.5 volts, It incorporates steresis.

[0071] The reset signal E4 from the low voltage detection circuit 56 is used by the latch circuits 46U, 46V, for each phase. The reset signal, which is input to 46W and the NOR circuit 48U, 48V, 48W, becomes high level. When the output of signal E4 latches the reset signal E4 to the latch circuits 46U, 46V, and 46W, In both cases, the outputs of the NOR circuits 48U, 48V, and 48W are all fixed to the L level, as shown in Figure 1 F Gate signals E10, E20, E30 for ET2410, 2412, 2414 are also L By fixing it to the bell, FET2410, 2412, and 2414 are all turned off, and three phase 1 The cycle-synchronous rectification control is stopped and the battery 14 is charged by the generated voltage of all phases to power the power supply. The pressure is restored. Also, the reset signal E4 from the low voltage detection circuit 56 When the level drops to L, it indicates that the three-phase one-cycle synchronous rectification control is enabled.

[0072] Furthermore, the control circuit is provided with an overvoltage detection circuit 58. The overvoltage detection circuit 58 is powered by A voltage VCC is input, and a predetermined overvoltage, for example 16 volts, is detected and the overvoltage reaches an H level. Outputs detection signal E5. The overvoltage detection signal E5 from the overvoltage detection circuit 58 is latched to the latch circuit. The reset signal is input to 46U, 46V, 46W, and the latch circuit 46U, 46V, The 46W output is fixed to a high level, and the FETs 2410, 2412, and 2414 in Figure 1 are connected. By fixing the corresponding gate signals E10, E20, and E30 to a high level, FET241 Turn on all of 0, 2412, and 2414, and stop the three-phase 1-cycle synchronous rectification control for all phases. By leaving the battery 14 in a non-charged state, the power supply voltage VCC is lowered by returning the battery 14 to the three-phase AC generator 10. I'm trying to get them to lower it.

[0073] [d. Configuration of the malfunction prevention circuit] Next, we will explain the malfunction prevention circuit provided in the control circuit.

[0074] (d1. Noise generation and malfunction prevention function) First, we will explain the noise generation and malfunction prevention functions. Refer to Figure 6, which is a time chart showing the signal waveform of the malfunction prevention circuit.

[0075] In the control circuit that performs three-phase one-cycle synchronous rectification control shown in Figure 4, the input of a certain phase The voltage, for example, the U-phase input voltage, is detected to cross zeros on the rising edge from negative to positive. The U-phase gate signal E10 from output terminal 54U is converted from H level to L level in three phases. The timing of switching the switch element 2410 of the full-wave rectifier circuit 12 from on to off Noise occurs, and the generated noise is transmitted to the other two phases, V phase and W phase, at the 30V, 30W input terminals. It is transmitted to and superimposed on the input voltages of the V-phase and W-phase, and the switching element 24 of the full-wave rectifier circuit 12 This could potentially cause a malfunction by accidentally turning on 12,2414.

[0076] Thus, an error occurs when noise generated at the output of one phase propagates to the input of the other two phases. To prevent malfunctions, a malfunction prevention circuit 60 is provided, as shown in Figure 4. The stopping circuit 60 consists of a filter control circuit 62 and a filter AND circuit 64U provided for each phase. It consists of 64V and 64W.

[0077] The malfunction prevention circuit 60, taking the U phase as an example, performs zero-crossing detection for the U phase as shown in Figure 6. Comparator 32U, which functions as an output circuit, captures the negative edge of the falling edge of the U-phase input voltage. After detecting the zero-crossing point 90, the edge mask signal E13 is used for a predetermined time T1. With u (see Figure 7 below) set to L level, the filter control signal E14u is set to H level, The AND circuit 64U for the router is set to an allowable state, disabling the filter function, and the control signal is sent to the output side. Allow the propagation of [the virus].

[0078] Furthermore, the malfunction prevention circuit 60 functions as a U-phase zero-crossing detection circuit. The 32U detects the positive edge zero-crossing point 92 of the rising edge of the U-phase input voltage. The edge mask signal E13u (see Figure 7 below) remains at an L level for a predetermined time T2. The output is set to a low level with the filter control signal E14u and the filter AND circuit 64 The filter function is enabled by setting U, 64V, and 64W to the disabled state, and the control signals containing noise are controlled. By preventing the propagation of noise to the output side, the switching element of the three-phase full-wave rectifier circuit 12 is prevented from being affected by the noise. This prevents malfunctions that could occur by accidentally turning on sub-units 2412 and 2414.

[0079] (d2. Filter control circuit) Next, the filter control circuit provided in the malfunction prevention circuit will be described. If applicable, refer to Figure 7, which shows the circuit configuration of the filter control circuit.

[0080] The configuration of the filter control circuit 62 is arbitrary, but for example, it can be configured as shown in Figure 7. The filter control circuit 62 in Figure 7, taking the U-phase circuit system as an example, consists of an input OR circuit 6 6U, RS-FF68U for edge mask, 70U for AND circuit and R for filter control It is equipped with S-FF72U. The V-phase and W-phase have the same configuration.

[0081] Additionally, an OR circuit 74 for mask-out is provided, which connects the reset signal E4 to the mask-out circuit. Input signal E6 and output RS-FF68U, 68V, 68W and for edge masking. It is connected to the reset terminal R of the RS-FF72U, 72V, and 72W used for filter control.

[0082] Furthermore, an OR circuit 76 is provided that takes the output of all-phase OR circuits 66U, 66V, and 66W as inputs. The output is then input to the filter timer circuit 77. The filter timer circuit 77 is The mask-out signal E6 is output to the OR gate 74. The filter timer circuit 77 is... It may be provided as an external circuit rather than being included in the filter control circuit 62.

[0083] (d3. Operation of the filter control circuit) Next, the operation of the filter control circuit will be explained. The signal waveform of your circuit is based on edge mass detection of the control signal containing noise. Figure 8 is a time chart showing the signal and filter control signal, and the battery charging device. Three-phase input voltage, three-phase gate signal, and three-phase filter control signal containing noise in the charging state Refer to Figure 9, which is an example time chart.

[0084] The U-phase control signal (U-phase input voltage) E1 in Figure 8 is transmitted from the positive side through 0 volts to the negative side. The voltage changes to the negative side, then linearly changes to the positive side via 0 volts, with the left side being controlled. The signal crosses over to 0 volts and falls to a negative edge, and the right side shows the control signal as 0 volts. It crosses and rises, creating a positive edge.

[0085] Furthermore, the U-phase control signal (U-phase input voltage) E1 is a triangular wave transmitted from the output side of the other phase. The noise signal En shown is superimposed. The noise signal En is set in comparator 32U. The voltage range between the defined reference voltage +Vref and -Vref exceeds 20 millivolts. It is anticipated that it will become a large size.

[0086] The filter timer circuit 77, at the negative edge of the U-phase control signal E1, performs negative edge filtering. Based on the cross detection signal E11u, a mask-out signal E6 is output. For details, see the following: The OR timer circuit 77 receives a noise signal En input via OR circuits 66U and 76. A timer is started for each negative edge zero-cross detection signal E11u, and increases at a predetermined slope. A timer signal is generated and the noise signal En is input via OR circuits 66U and 76. The timer signal is reset by the positive edge zero-crossing detection signal E12u. Negative edge zero-crossing detection signal E11u and positive edge zero-crossing detection signal En When signal E12u stops outputting, the started timer signal will reach a predetermined voltage, for example, 2 volts. When the threshold is reached and a predetermined time has elapsed, a mask-out signal E6 is output.

[0087] Furthermore, the filter timer circuit 77, at the positive edge of the U-phase control signal E1, Based on the edge zero-cross detection signal E12u, a mask-out signal E6 is output. For details, The filter timer circuit 77 receives the noise signal E through the OR circuits 66U and 76. The timer is started for each positive edge zero cross detection signal E12u by n, and a predetermined angle is set. A timer signal is generated that increases with time, and the noise signal input via OR gates 66U and 76 is received. The timer signal is reset by the negative edge zero-crossing detection signal E11u, which is generated by signal En.

[0088] Negative edge zero-crossing signal E11u and positive edge zero-crossing signal detection by noise signal En When the output signal E12u stops being output, the started timer signal will reach a predetermined voltage, for example, 2 When the voltage reaches a certain level and a predetermined time has elapsed, a mask-out signal E6 is output.

[0089] The RS- FF68U outputs the edge mask signal E13u from its inverted Q output. The FF68U is negative due to the noise signal En that is initially input via the OR circuit 66U. The edge zero-cross detection signal E11u is set, and the edge mask signal E13u is set to L level. The noise signal En is used to detect subsequent negative edge zero-crossing signals E11u. The edge mask signal E13u becomes high level via the AND circuit 70U, and the RS- An edge mask is applied to disable the set input of the FF72U. Next, the RS-FF68U The timer signal activated by the last negative edge zero-cross detection signal E11u due to noise is 2 The mask-out signal E6, which occurs when the voltage is reached and a predetermined time has elapsed, resets the edge. The mask signal E13u is set to a high level, and the negative edge zero-cross detection signal E11u is set to an edge level. Remove the mask.

[0090] The RS-FF72U outputs a filter control signal E14u from its inverting Q output. The FF72U is the first positive edge generator due to noise input via the AND circuit 70u. The Rocross detection signal E12u sets the filter control signal E14u to an L level. This disables the AND circuit 64U for filtering, preventing the propagation of the control signal to the output side. Enable the filter function. Next, the last negative edge zero cross detection signal due to noise. When the timer signal activated by unit E11u reaches 2 volts and a predetermined time has elapsed, the masked area The filter control signal is reset by inputting the out signal E6 via the OR circuit 74. Setting E14u to a high level allows the filter AND circuit 64U to be in an acceptable state, thus providing a filter function. Release the signal and propagate the control signal to the output side.

[0091] The filter control signal E14u, which has become L level from the U-phase RS-FF72U, AND The set state of RS-FF72V, 72W of the V phase and W phase via the 70V, 70W circuit and Furthermore, the other two phases, the V phase and W phase of the RS-FF72V and 72W, also produce an L level signal. The filter control signals E14V,14W are output to the filter AND circuit 64V,64W. By setting the filter control signal E14v,14w to an L level, the filter function is enabled. , prohibiting the transmission of control signals containing noise from the U phase to the output side in the U phase and W phase. This prevents the switch elements 2412 and 2414 in the full-wave rectifier circuit 12 from turning on in a malfunction. That is, as shown in the U-phase gate signal E10 in Figure 8, the filter control signal E14u is By setting the level to L and disabling the filter AND circuit 64U, the noise signal En... A stable gate signal is output that maintains an L level without the transmission of chattering.

[0092] Filter when zero-crossing of negative and positive edges is detected in the V-phase or W-phase. The operation of the control circuit 62 and the filter timer circuit 77 will be the same as in the case of the U phase described above. Therefore, I will omit the explanation.

[0093] As a result, as shown in Figure 9, the positive values ​​of the U-phase, V-phase, and W-phase input voltages E1, E2, E3 At the timing of edge zero-crossing detection, is the U-phase, V-phase, or W-phase gate signal at a high level? Then it changes to L level and the corresponding switch elements 2410, 241 of the three-phase full-wave rectifier circuit 12 Noise occurs when switching 2,2414 from on to off, and noise is also generated on the other two-phase input side. It propagates. However, in response to zero-crossing detection of the negative edge of the U-phase, V-phase, or W-phase, Filter control signals E14u, 14v, and 14w remain at a low level for a predetermined time. Therefore, The AND gates 64U, 64V, and 64W for the router are disabled, and the output of control signals containing noise is disabled. This prevents transmission to the force side and eliminates errors in switch elements 2410, 2412, and 2414 due to noise. This prevents accidental activation during operation, enabling stable three-phase, one-cycle synchronous rectification control.

[0094] [e. Semiconductor integrated circuit equipment] In the example configuration of the control circuit 20 shown in Figure 4, all or part of the control circuit 20, For example, the number of components can be reduced by integrating the charging control unit 36, which includes a malfunction prevention circuit, into an integrated circuit. Furthermore, cost reduction is possible by reducing the mounting area. The circuitry in this integrated circuit portion is It is formed on a semiconductor chip with a CMOS configuration and commercialized as a semiconductor integrated circuit device. Furthermore, integrated semiconductor integrated circuit devices and other components are mounted on a wiring board. The components in this form constitute the battery charging circuit that makes up the battery charging device.

[0095] [f. Variations of the present invention] A modified example of the battery charging device according to the present invention will be described. The configuration includes, in addition to the embodiments described above, appropriate modifications that do not impair its purpose and advantages. Furthermore, the present invention is not limited by the numerical values ​​shown in the above embodiments.

[0096] For example, in the above embodiment, we will explain using "three-phase" as an example, such as a three-phase AC generator. However, the technical concept of this invention can be applied to multiphase systems other than three-phase systems to achieve the desired effects. Furthermore, although the rectifier circuit is a full-wave rectifier circuit, the same results can be obtained by applying it to a half-wave rectifier circuit. It can produce the essential effect. [Explanation of Symbols]

[0097] 10: Three-phase AC generator 12: Three-phase full-wave rectifier circuit 14: Battery 16: Load 18: Fuse 20: Control circuits 22: Rectifier element group 2210, 2212, 2214: Rectifier elements 24: Switching element group 2410, 2412, 2414: Switch elements 26: Power line 28: Grand Line 30U, 30V, 30W: Input terminal 32U, 32V, 32W: Comparator 34U, 34V, 34W: Switching circuit 35: Input Circuit Section 36: Charging Control Unit 37: Output Circuit Section 38U, 38V, 38W: Inverter 40U, 40V, 40W: Posi-edge one-shot 42U, 42V, 42W: Negative Edge One Shot 44U, 44V, 44W: AND circuit 46U, 46V, 46W: Latch circuit 48U, 48V, 48W: NOR circuit 50U, 50V, 50W: Level shift circuit section 52U, 52V, 52W: Driver circuit 54U, 54V, 54W: Output terminals 60: Malfunction prevention circuit 62: Filter control circuit 64U, 64V, 64W: AND circuit for filter 66U, 66V, 66W, 74, 76: OR circuit 68U, 68V, 68W: RS-FF 70U, 70V, 70W:AND circuit 72U, 72V, 72W: RS-FF 77: Filter Timer Circuit 78U, 78V, 78W: Zener diode 80U, 80V, 80W: Zener diode 90: Negative edge zero crossing detection point 92: Positive edge zero crossing detection point

Claims

1. The output of an AC power supply is used as input, and a rectifier circuit equipped with a group of rectifier elements and a group of switch elements is used to rectify the AC power. A battery charging device that charges a battery using a DC voltage that is supplied, Control the corresponding switch element in the group of switch elements for each phase of the output of the AC power supply. It is equipped with a control circuit, The control circuit switches the switch element corresponding to a predetermined phase from on to off. This malfunction prevention system prevents malfunctions caused by output noise being transmitted to the input of other phases. A battery charging device characterized by having a shut-off circuit.

2. A battery charging device according to claim 1, The aforementioned control circuit is The zero-crossing of the rising edge from negative to positive of the output voltage of each phase of the aforementioned AC power supply is detected. Zero-crossing detection circuit, When a zero-crossing of the rising edge is detected, the switch element is switched from on to off. The charging method switches to charging the battery with the DC voltage rectified by the rectifier element group. Your circuit and, It is equipped with, The aforementioned malfunction prevention circuit is A filter circuit that prevents the propagation of control signals containing noise from other phases to the output side, After detecting the zero-crossing of the rising edge of the output voltage of the other phase, a predetermined time interval The filter control circuit releases the mask of the filter circuit and prohibits the propagation of the control signal. Road and, A battery charging device characterized by having the following features.

3. A battery charging device according to claim 2, The zero-cross detection circuit detects the falling edge of the output voltage of each phase of the AC power supply from positive to negative. Detect the zero cross of the ledge, The charging control circuit, when it detects the zero-crossing of the falling edge, switches Switching the element from off to on returns the battery to the AC power supply, The filter control circuit detects the falling edge of the output voltage of the other phase using the zero-crossing detection circuit. The filter circuit is masked and controlled for a predetermined time after detecting the zero-crossing of the threshold. Allow the propagation of the signal. A battery charging device characterized by the following features.

4. The output of an AC power supply is used as input, and a rectifier circuit equipped with a group of rectifier elements and a group of switch elements is used to rectify the AC power. A battery charging circuit that charges a battery using a DC voltage that is supplied, Control the corresponding switch element in the group of switch elements for each phase of the output of the AC power supply. It is equipped with a control circuit, The control circuit switches the switch element corresponding to a predetermined phase from on to off. This malfunction prevention system prevents malfunctions caused by output noise being transmitted to the input of other phases. A battery charging circuit characterized by having a stop circuit.

5. A battery charging circuit according to claim 4, The aforementioned control circuit is The zero-crossing of the rising edge from negative to positive of the output voltage of each phase of the aforementioned AC power supply is detected. Zero-crossing detection circuit, When a zero-crossing of the rising edge is detected, the switch element is switched from on to off. The charging method switches to charging the battery with the DC voltage rectified by the rectifier element group. Your circuit and, It is equipped with, The aforementioned malfunction prevention circuit is A filter circuit that prevents the propagation of control signals containing noise from other phases to the output side, After detecting the zero-crossing of the rising edge of the output voltage of the other phase, a predetermined time interval The filter control circuit releases the mask of the filter circuit and prohibits the propagation of the control signal. Road and, A battery charging circuit characterized by having the following features.

6. A battery charging circuit according to claim 5, The zero-cross detection circuit detects the falling edge of the output voltage of each phase of the AC power supply from positive to negative. Detect the zero cross of the ledge, The charging control circuit, when it detects the zero-crossing of the falling edge, switches Switching the element from off to on returns the battery to the AC power supply, The filter control circuit detects the falling edge of the output voltage of the other phase using the zero-crossing detection circuit. The filter circuit is masked and controlled for a predetermined time after detecting the zero-crossing of the threshold. Allow the propagation of the signal. A battery charging circuit characterized by the following features.

7. The output of an AC power supply is used as input, and a rectifier circuit equipped with a group of rectifier elements and a group of switch elements is used to rectify the AC power. Control to control the group of switch elements so that the battery is charged by the applied DC voltage. A semiconductor integrated circuit device comprising a circuit for each phase of the output of the AC power supply, The control circuit switches the switch element corresponding to a predetermined phase from on to off. This malfunction prevention system prevents malfunctions caused by output noise being transmitted to the input of other phases. A semiconductor integrated circuit device characterized by being equipped with a stop circuit.

8. A battery charging circuit according to claim 7, The aforementioned control circuit is The zero-crossing of the rising edge from negative to positive of the output voltage of each phase of the aforementioned AC power supply is detected. Zero-crossing detection circuit, When a zero-crossing of the rising edge is detected, the switch element is switched from on to off. The charging method switches to charging the battery with the DC voltage rectified by the rectifier element group. Your circuit and, It is equipped with, The aforementioned malfunction prevention circuit is A filter circuit that prevents the propagation of control signals containing noise from other phases to the output side, After detecting the zero-crossing of the rising edge of the output voltage of the other phase, a predetermined time interval The filter control circuit releases the mask of the filter circuit and prohibits the propagation of the control signal. Road and, A semiconductor integrated circuit device characterized by having the following features.

9. A semiconductor integrated circuit apparatus according to claim 8, The zero-cross detection circuit detects the falling edge of the output voltage of each phase of the AC power supply from positive to negative. Detect the zero cross of the ledge, The charging control circuit, when it detects the zero-crossing of the falling edge, switches Switching the element from off to on returns the battery to the AC power supply, The filter control circuit detects the falling edge of the output voltage of the other phase using the zero-crossing detection circuit. The filter circuit is masked and controlled for a predetermined time after detecting the zero-crossing of the threshold. Allow the propagation of the signal. A semiconductor integrated circuit device characterized by the following features.

Images