JP4992617B2 - Signal propagation device and power conversion system - Google Patents

Description

  The present invention relates to a signal propagation device that transmits a binary propagation target signal of logic “H” and logic “L” from one of a high-voltage system and a low-voltage system to the other, and a power conversion system including the signal propagation device.

  As this type of signal propagation device, for example, there is a device that transmits a drive signal of a switching element of an inverter connected to an electric motor in a vehicle-mounted hybrid system from a low-voltage system to a high-voltage system via a photocoupler. That is, the drive signal of the switching element of the inverter is generated by the low-voltage system, and when this is output to the high-voltage system, a photocoupler is used to insulate the low-voltage system from the high-voltage system.

In addition to this, as a conventional signal propagation device, for example, there is one found in Patent Document 1 below.
Japanese Patent Laid-Open No. 10-79809

  By the way, it is known that the lifetime of a photocoupler depends on the value of a current flowing on the primary side (photodiode side) and the ambient temperature around the photocoupler. Here, regarding the current flowing through the photodiode, the life of the photocoupler is shortened as the amount of current increases.

  On the other hand, the period during which the photocoupler is in the ON state is a period of logic “H” or logic “L” of the drive signal. For this reason, the period during which the photocoupler is in the on state is determined according to the operation of the inverter, and depending on the request for controlling the motor, the on time of the photocoupler can be very long. For this reason, it is difficult to reduce the current flowing through the photocoupler, and it is also difficult to sufficiently extend the life of the photocoupler. In particular, since the vehicle system is required to be designed on the assumption that it will be used for a long time, it is strongly desired to reduce the current flowing through the primary side in the photocoupler mounted in the vehicle system. It is.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to transfer a binary propagation target signal of logic “H” and logic “L” from one of the high-pressure system and the low-pressure system to the other. Therefore, it is an object of the present invention to provide a signal propagation device capable of suitably extending the life of a photocoupler and a power conversion system including the signal propagation device.

  Hereinafter, means for solving the above-described problems and the operation and effects thereof will be described.

The invention according to claim 1 is a signal propagation device that transmits a binary propagation target signal of logic “H” and logic “L” from one of the high-pressure system and the low-pressure system to the other.
A defining signal that is a plurality of pulse signals having a pulse width shorter than a period of logic “H” and logic “L” of the propagation target signal and that defines rising and falling of the propagation target signal is When input from one system to the photocoupler, the other system includes a generating unit that generates the propagation target signal from the signal output from the photocoupler , and the specified signal has a rising edge of the propagation target signal. the number of pulse signals for defining the number of pulse signals for defining the falling of the propagation target signal and said Rukoto different from each other.

In the above invention, each pulse signal is a signal for turning on the photocoupler, so that one on-time of the photocoupler is synchronized with the logic “H” and the logic “L” of the propagation target signal. Is shorter than the ON time of one time when the is turned on / off. For this reason, when the photocoupler is turned on / off in synchronization with the logic “H” and the logic “L”, the average time or the total time on a certain time scale for the on-time of the photocoupler by the specified signal is used. Compared with this, the time can be significantly shortened. In other words, for the total on time of the photocoupler by the specified signal that defines the rise and fall of the signal to be propagated once, the photocoupler is turned on in synchronization with the logic “H” and logic “L” of the signal to be propagated. Even if it may be more than the case where the off operation is performed, the average time or the total time in a certain time case is remarkably increased under the situation where the logic “H” period and the logic “L” period of the propagation target signal fluctuate. Can be reduced.
In particular, in the above invention, the rising and falling edges of the propagation target signal can be appropriately defined by the difference in the number of pulse signals generated per unit time.

  According to a second aspect of the present invention, in the first aspect of the invention, the generation unit includes a delay unit that delays a signal on the output side of the photocoupler, and the delay among the signals on the output side of the photocoupler. The logic value of the other signal is output in synchronization with the edge of one of the signal passing through the means and the signal not passing through the means.

  The edge of either one of the signals and the other signal is generated at a timing shifted from each other. Therefore, if the logical value of the other signal is output in synchronization with the edge of one signal, the output signal becomes a signal that rises and falls in synchronization with the edge of one signal. For this reason, it is possible to appropriately generate the propagation target signal based on the prescribed signal composed of a plurality of pulse signals.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the generation unit delays a signal on the output side of the photocoupler, a rising edge of the signal on the output side of the photocoupler, and A counter that inverts the logical value in synchronization with one of the falling edges and is initialized in synchronization with either the rising edge or the falling edge of the output signal of the delay means; and the output of the delay means And a flip-flop that captures the output of the counter in synchronization with either the rising edge or the falling edge.

  According to the above invention, the values of the counters at the edges of the delay means corresponding to the pulse signal that defines the rising edge of the propagation target signal and the pulse signal that defines the falling edge of the propagation target signal are different from each other. Can be. For this reason, the rise and fall of the propagation target signal can be defined by the difference in the number of pulses per unit time.

According to a fourth aspect of the present invention, there is provided a signal propagation device for transmitting a binary propagation target signal of logic “H” and logic “L” from one of the high-voltage system and the low-pressure system to the other, and the logic of the propagation target signal. A plurality of pulse signals having a pulse width shorter than a period of “H” and logic “L” and a signal defining a rising edge and a falling edge of the propagation target signal are transmitted from the one system to the photocoupler. And generating means for generating the propagation target signal from the signal output from the photocoupler in the other system, wherein the defining signal is a pulse for defining a rising edge of the propagation target signal. The pulse width of the signal and the pulse width of the pulse signal for defining the falling edge of the propagation target signal are different from each other, The generating means delays the signal on the output side of the photocoupler, and the value of the signal on the output side of the photocoupler in synchronization with either the rising edge or falling edge of the output signal of the delay means. The flip-flop has a function of turning off the output of the flip-flop when any of the edges of the output of the delay means is not input for a predetermined time or more .

In the above invention, each pulse signal is a signal for turning on the photocoupler, so that one on-time of the photocoupler is synchronized with the logic “H” and the logic “L” of the propagation target signal. Is shorter than the ON time of one time when the is turned on / off. For this reason, when the photocoupler is turned on / off in synchronization with the logic “H” and the logic “L”, the average time or the total time on a certain time scale for the on-time of the photocoupler by the specified signal is used. Compared with this, the time can be significantly shortened. In other words, for the total on time of the photocoupler by the specified signal that defines the rise and fall of the signal to be propagated once, the photocoupler is turned on in synchronization with the logic “H” and logic “L” of the signal to be propagated. Even if it may be more than the case where the off operation is performed, the average time or the total time in a certain time case is remarkably increased under the situation where the logic “H” period and the logic “L” period of the propagation target signal fluctuate. Can be reduced.
In particular, in the above invention, the rising and falling of the propagation target signal can be appropriately defined by the difference in the pulse width of the pulse signal.
Moreover, in the above invention, even when an abnormality occurs in the output system of the signal from the delay means to the flip-flop, it can be avoided that the generation means is permanently turned on.

According to a fifth aspect of the invention, in the invention according to any one of the first to third aspects, the generation means delays a signal on the output side of the photocoupler, and an output signal of the delay means. And a flip-flop that takes in the value of the signal on the output side of the photocoupler in synchronization with either the rising edge or the falling edge.

  In the above invention, if the pulse signal that defines the rise of the signal to be propagated is different from the pulse signal that defines the fall, the edge of the delay signal that defines the rise and the delay signal that defines the fall The values of signals taken into the flip-flop at the edge can be made different from each other. For this reason, the rise and fall of the propagation target signal can be properly defined.

The invention according to claim 6 is the function according to claim 5 , wherein the flip-flop turns off the output of the flip-flop when any one of the outputs of the delay means is not input for a predetermined time or more. It is characterized by having.

  In the above invention, even when an abnormality occurs in the output system of the signal from the delay means to the flip-flop, the generation means can be prevented from being permanently turned on.

The invention according to claim 7 is the invention according to any one of claims 1 to 6 , wherein the high-voltage system includes an in-vehicle power conversion circuit, and the propagation target signal is the power conversion circuit. It is a signal for driving the switching element.

  Since an in-vehicle power conversion circuit may be used for a long time, it must be designed to withstand long-time use. For this reason, the lifetime of the photocoupler is particularly problematic. Therefore, according to the said invention, the applicability value of the invention of Claims 1-7 is especially large.

The invention according to claim 8 is a power conversion system comprising the signal propagation device according to claim 7 and the power conversion circuit.

  In the above invention, since the lifetime of the photocoupler can be suitably extended, the reliability of the power conversion system can be improved.

(First embodiment)
Hereinafter, a first embodiment in which a signal propagation device and a power conversion system according to the present invention are applied to a hybrid vehicle will be described with reference to the drawings.

  FIG. 1 shows the overall configuration of a motor generator control system according to this embodiment.

  As shown in the figure, an inverter 12 is connected to three phases (U phase, V phase, and W phase) of the motor generator 10. The inverter 12 is a three-phase inverter, and appropriately applies the voltage of the high voltage battery 14 to the three phases of the motor generator 10. Specifically, the inverter 12 is a parallel connection body of the switching elements SW1, SW2, the switching elements SW3, SW4, and the switching elements SW5, SW6 so that each of the three phases and the positive electrode side or the negative electrode side of the high voltage battery 14 are electrically connected. It is configured with. A connection point for connecting switching element SW <b> 1 and switching element SW <b> 2 in series is connected to the U phase of motor generator 10. Further, a connection point for connecting switching element SW3 and switching element SW4 in series is connected to the V phase of motor generator 10. Furthermore, a connection point for connecting switching element SW5 and switching element SW6 in series is connected to the W phase of motor generator 10. Incidentally, these switching elements SW1 to SW6 are constituted by insulated gate bipolar transistors (IGBT) in this embodiment. The inverter 12 includes flywheel diodes D1 to D6 connected in antiparallel to the switching elements SW1 to SW6.

  The switching elements SW <b> 1 to SW <b> 6 are driven by a microcomputer (microcomputer 20) using the low voltage battery 18 as a power source via the interface 16. That is, the microcomputer 20 outputs to the interface 16 regulation signals rup, run, rvp, rvn, rwp, rwn that define drive signals for driving the switching elements SW1 to SW6. In the interface 16, drive signals gup, gun, gvp, gvn, gwp, and gwn are generated from these specified signals rup, run, rvp, rvn, rwp, and rwn, and the switching elements SW1 to SW6 are driven by these. That is, in the microcomputer 20, when setting the drive signals “gup”, “gun”, “gvp”, “gvn”, “gwp”, and “gwn” for generating the required torque by, for example, the well-known triangular wave PWM control, the microcomputer 20 does not directly output this. The prescribed signals rup, run, rvp, rvn, rwp, rwn are output. Then, the interface 16 decodes the prescribed signals rup, run, rvp, rvn, rwp, and rwn to generate drive signals gup, gun, gvp, gvn, gwp, and gwn.

  Accordingly, the switching element SW1 is driven by the drive signal “gup” generated from the regulation signal “rup”, and the switching element SW2 is driven by the drive signal “gun” generated from the regulation signal “run”. Further, the switching element SW3 is driven by the driving signal gvp generated from the regulation signal rvp, and the switching element SW4 is driven by the driving signal gvn generated from the regulation signal rvn. Further, the switching element SW5 is driven by the drive signal gwp generated from the regulation signal rwp, and the switching element SW6 is driven by the drive signal gwn generated from the regulation signal rwn.

  FIG. 2 shows the configuration of the circuit portion of the interface 16 that generates the drive signals gup, gun, gvp, gvn, gwp, and gwn from the prescribed signals rup, run, rvp, rvn, rwp, and rwn. In FIG. 2, the prescribed signals rup, run, rvp, rvn, rwp, rwn are collectively used as the input signal Vin to the interface 16, and the drive signals gup, gun, gvp, gvn, gwp, gwn are summarized. , An output signal Vout from the interface 16. The interface 16 actually includes the circuit shown in FIG. 2 for each of the prescribed signals rup, run, rvp, rvn, rwp, and rwn, but only one of them is shown here.

  As shown in the figure, the interface 16 includes a photocoupler 30 that insulates the high voltage system side configured with the inverter 12 from the low voltage system side configured with the microcomputer 20. On the low-voltage system side, a low-voltage system-side power supply 40 is connected to the ground via the photodiode of the photocoupler 30 and the switching element 42. The switching element 42 is switched between an on state and an off state by an input signal Vin. When the switching element 42 is turned on, a current flows from the low-voltage system-side power supply 40 to the ground via the photodiode, so that the photocoupler 30 is turned on.

  The phototransistor of the photocoupler 30 connects the high-voltage system-side power supply 50 and the ground. An inverter 52 is connected to the phototransistor. The inverter 52 is for making the input signal Vin have the same logical value in view of the fact that the output signal of the phototransistor becomes a logical inversion signal of the input signal Vin. That is, when the input signal Vin becomes logic “H” and the photocoupler 30 is turned on, the high-voltage system-side power supply 50 is grounded via the phototransistor. "Is input. For this reason, the inversion signal V1 output from the inverter 52 is a signal having the same logical value as the input signal Vin.

  The inverted signal V1 is taken into the clock terminal CK of the counter 54 and taken into the delay circuit 56. Here, the counter 54 inverts the logical value of the signal output from the output terminal D in synchronization with the rising edge of the signal input to the clock terminal CK. The counter 54 includes a reset terminal R, and resets the signal output from the output terminal D in synchronization with the falling edge of the signal captured by the reset terminal R (set to logic “L”). The delay signal V3 output from the delay circuit 56 is applied to the reset terminal R.

  The output terminal D of the counter 54 is connected to the input terminal D of the D flip-flop 58. The clock terminal CK of the D flip-flop 58 is connected to the delay circuit 56. The D flip-flop 58 stores and holds the signal of the input terminal D as the output signal Vout (the output signal Vout of the interface 16) output from the output terminal Q in synchronization with the rising edge of the signal captured by the clock terminal CK. To do. Note that the D flip-flop 58 has a function of setting a signal output from the output terminal Q to logic “L” when a rising edge is not taken in the clock terminal CK for a predetermined time or longer.

  FIG. 3 shows a process for generating the output signal Vout from the input signal Vin by the above circuit configuration. Specifically, FIG. 3A shows the transition of the input signal Vin, FIG. 3B shows the transition of the inverted signal V1, and FIG. 3C shows the output from the output terminal D of the counter 54. The transition of the signal V2 is shown, FIG. 3 (d) shows the transition of the delay signal V3 output from the delay circuit 56, and FIG. 3 (e) shows the transition of the output signal Vout.

  In this embodiment, the input signal Vin is divided into a pulse signal for defining the rising edge of the output signal Vout and a pulse signal for defining the falling edge (a binary value consisting of logic “H” and logic “L” only during the pulse width period). Signal that transitions to one of the values). Here, by making the pulse signal for defining the rising edge of the output signal Vout and the pulse signal for defining the falling edge different from each other, whether to define the rising edge or the falling edge? Is given discriminatory power. Specifically, in the present embodiment, the discriminating power of whether to specify rising or falling is given by the number of pulses per unit time. Specifically, the pulse signal for defining the rising edge is a single pulse signal p1, and the pulse signal for defining the falling edge is a leading pulse signal that is two pulse signals fired within a unit time. Let p2 and the backward pulse signal p3. Here, in the present embodiment, the time from the rising edge of the single pulse signal p1 to the rising edge of the leading pulse signal p2 defines the time when the output signal Vout becomes logic “H”, and the rising edge of the leading pulse signal p2 The time from the edge to the rising edge of the next single pulse signal p1 defines the time when the output signal Vout becomes logic “L”.

  When the single pulse signal p1 of the input signal Vin rises, the signal V2 output from the counter 54 in synchronism with this becomes the logic “H”. Thereafter, in synchronization with the rising edge of the delay signal V 3 obtained by delaying the single pulse signal p 1 by the delay circuit 56, the signal V 2 output from the counter 54 is taken into the D flip-flop 58. As a result, the output signal Vout output from the D flip-flop 58 becomes logic “H”. That is, the timing of the rising edge of the output signal Vout is a timing obtained by delaying the timing of the rising edge of the single pulse signal p1 by the delay time τ by the delay circuit 56. Thereafter, the counter 54 is reset in synchronization with the falling edge of the delay signal V3 obtained by delaying the single pulse signal p1 by the delay circuit 56.

  Next, when the leading pulse signal p2 of the input signal Vin rises, the signal V2 output from the counter 54 is inverted again to the logic “H”. Then, as the backward pulse signal p3 rises, the signal V2 output from the counter 54 is inverted again to the logic “L”. Thereafter, in synchronization with the rise of the delay signal V3 of the leading pulse signal p2, the D flip-flop 58 takes in the signal V2 output from the counter 54. Therefore, at this timing, the output signal Vout becomes logic “L”. That is, the timing of the falling edge of the output signal Vout is the timing obtained by delaying the timing of the rising edge of the leading pulse signal p2 by the delay time τ by the delay circuit 56.

  In order to perform the above processing satisfactorily, the delay time τ is set longer than the time interval from the rising edge of the leading pulse signal p2 to the rising edge of the backward pulse signal p3. Thereby, the output signal Vout is defined. According to such a configuration, the on-time of the photocoupler 30 can be shortened as compared with the case where the drive signals gup, gun, gvp, gvn, gwp, and gwn are directly transmitted by the photocoupler 30. That is, the single pulse width of each of the pulse signals p1, p2, and p3 constituting the regulation signal is the period of the logic “H” or logic “L” of the drive signals gup, gun, gvp, gvn, gwp, gwn. Shorter than. For this reason, the on-time of the photocoupler 30 is always shorter than both the logic “H” and logic “L” periods of the drive signals gup, gun, gvp, gvn, gwp, and gwn. Here, each period of the logic “H” and the logic “L” of the drive signals “gup”, “gun”, “gvp”, “gvn”, “gwp”, and “gwn” can take various values at random. For this reason, depending on the case, the three pulse signals p 1, p 2, and p 3 that constitute the specified signal in any period of logic “H” and logic “L” of the drive signals gup, gun, gvp, gvn, gwp, and gwn. It may be shorter than the total pulse width. However, on a certain time scale, the average on-time and the total on-time of the photocoupler 30 in this embodiment are such that the drive signals gup, gun, gvp, gvn, gwp, gwn are directly transmitted by the photocoupler 30. It is shortened compared with the case of doing. For this reason, the lifetime of the photocoupler 30 can be suitably extended.

  In addition, according to such a configuration, it is possible to increase resistance to noise as compared with the case where the output signal Vout is generated using only the counter 54. That is, when the output signal Vout is generated from the specified signal by the counter 54 alone, once the counter 54 malfunctions due to noise, the output signal Vout is converted into the original drive signals gup, gun, Its logical value is opposite to that of gvp, gvn, gwp, and gwn. On the other hand, in the above configuration, even when noise occurs, the output signal Vout is restored to a correct logical value when the output signal Vout is generated based on the next specified signal.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) A plurality of pulse signals p1, p2, and p3 having pulse widths shorter than the periods of logic “H” and logic “L” of the propagation target signals (drive signals gup, gun, gvp, gvn, gwp, gwn) The propagation target signal is generated based on a defining signal that is a signal that defines the rising and falling edges of the propagation target signal. Thereby, the average on-time or total on-time of the photocoupler 30 in a certain time case can be significantly reduced.

  (2) A delay circuit 56 that delays the signal on the output side of the photocoupler 30 is provided, and the signal on the output side of the photocoupler 30 does not pass through the delay circuit 56 in synchronization with the edge of the signal that passes through the delay circuit 56. The logic value of the signal was output as the signal to be propagated. As a result, the propagation target signal can be appropriately generated based on the prescribed signal composed of a plurality of pulse signals.

  (3) The number of pulse signals p1 for defining the rising edge of the propagation target signal (one) is different from the number of pulse signals p2 and p3 for defining the trailing edge of the propagation target signal (two). . Thereby, the rise and fall of the propagation target signal can be appropriately defined.

  (4) a counter 54 that inverts the logical value in synchronization with the rising edge of the output side signal (inverted signal V1) of the photocoupler 30 and is initialized in synchronization with the falling edge of the delay signal V3; And a D flip-flop 58 for capturing the output of the counter 54 in synchronization with the rising edge of the signal V3. Thereby, the propagation target signal can be appropriately generated.

  (5) When the rising edge of the delay signal V3 is not input for a predetermined time or more, the D flip-flop 58 has a function of turning off the output. Thereby, even when an abnormality occurs in the output system of the signal from the delay circuit 56 to the D flip-flop 58, it is possible to avoid the output signal Vout from being permanently turned on.

  (6) The present invention is applied when transmitting drive signals gup, gun, gvp, gvn, gwp, and gwn for driving the switching elements SW1 to SW6 of the in-vehicle inverter 12 from the low pressure system to the high pressure system. For this reason, the photocoupler 30 is required to be designed to withstand long-time use. For this reason, the life of the photocoupler 30 is particularly problematic. Therefore, according to this embodiment, the applicability of the present invention is particularly great.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  FIG. 4 shows a configuration according to the present embodiment of the circuit portion of the interface 16 that generates the drive signals gup, gun, gvp, gvn, gwp, and gwn from the prescribed signals rup, run, rvp, rvn, rwp, and rwn. In FIG. 4, members corresponding to those shown in FIG. 2 are given the same reference numerals for convenience.

  As shown in the figure, in this embodiment, the inverted signal V <b> 1 is taken into the input terminal D of the D flip-flop 58 without providing the counter 54.

  FIG. 5 shows a process for generating the output signal Vout from the input signal Vin by the above circuit configuration. Specifically, FIG. 5A shows the transition of the input signal Vin, FIG. 5B shows the transition of the inverted signal V1, and FIG. 5C shows the delay signal V3 output from the delay circuit 56. FIG. 5D shows the transition of the output signal Vout.

  As shown in the figure, in the present embodiment, the pulse widths of the pulse signals p4 and p5 that constitute the defining signal are used to identify whether the output signal Vout rises or falls. Giving power. Specifically, in the present embodiment, the pulse width of the pulse signal p4 for defining the rising edge of the output signal Vout is made wider than the pulse width of the pulse signal p5 for regulating the falling edge. Specifically, the rising edge of the output signal Vout is defined by the rising edge of the pulse signal p4, and the falling edge of the output signal Vout is defined by the rising edge of the pulse signal p5.

  The D flip-flop 58 takes in the inverted signal V1 in synchronization with the rising edge of the delay signal V3 obtained by delaying the pulse signal p4 by the delay circuit 56. As a result, the output signal Vout is inverted to logic “H”. That is, the timing of the rising edge of the output signal Vout is the timing obtained by delaying the timing of the rising edge of the pulse signal p4 by the delay time τ by the delay circuit 56. Thereafter, the D flip-flop 58 takes in the inverted signal V1 in synchronization with the rising edge of the delay signal V3 delayed by the delay circuit 56 from the pulse signal p5. As a result, the output signal Vout is inverted to logic “L”. That is, the falling edge of the output signal Vout is obtained by delaying the timing of the rising edge of the pulse signal p5 by the delay time τ of the delay circuit 56.

  In order to realize such processing, the delay time τ of the delay circuit 56 is set to be longer than the pulse width of the pulse signal p5 and shorter than the pulse width of the pulse signal p4. Thereby, the output signal Vout is generated.

  According to this embodiment described in detail above, in addition to the effects (1), (2), (5), and (6) of the first embodiment, the following effects can be obtained. .

  (7) The defining signal is configured such that the pulse width of the pulse signal p4 that defines the rising edge of the propagation target signal and the pulse width of the pulse signal p6 that defines the falling edge of the propagation target signal are different from each other. Thereby, the rise and fall of the propagation target signal can be appropriately defined.

  (8) A delay circuit 56 that delays the inverted signal V1 and a D flip-flop 58 that captures the inverted signal V1 in synchronization with the rising edge of the delayed signal V3 are provided. Thereby, the rise and fall of the propagation target signal can be appropriately defined.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  In the first embodiment, the counter 54 may invert the logic value in synchronization with the falling edge of the signal input to the clock terminal.

  In the first embodiment, the inverter 52 may not be provided. In this case, the counter 54 is initialized in synchronization with the rising edge of the signal applied to the reset terminal R by inverting the logical value in synchronization with the edge at the falling edge of the signal fetched from the clock terminal CK. The D flip-flop 58 may capture the signal applied to the input terminal D in synchronization with the falling edge of the signal applied to the clock terminal CK. Accordingly, the rising edge of the output signal Vout is defined by the rising edge of the single pulse signal p1 of the input signal Vin, and the rear of the two pulse signals p2 and p3 of the input signal Vin that are fired continuously. The falling edge of the output signal Vout can be defined at the rising edge of the pulse signal p3.

  In the first embodiment, the D flip-flop 58 captures a signal input to the input terminal in synchronization with the falling edge of the delay signal V3, and resets the counter 54 more than the falling edge of the delay signal V3. In order to delay, another delay circuit for delaying the inverted signal V1 further than the delay circuit 56 may be further provided. In this case, the falling edge of the signal delayed by another delay circuit is delayed from the falling edge of the delay signal V3 output from the delay circuit 56, and the counter is detected at the falling edge of the signal delayed by another delay circuit. 54 is reset.

  The number of pulse signals for defining the rising edges of the drive signals gup, gun, gvp, gvn, gwp, and gwn, and the pulse signals for defining the falling edges of the drive signals gup, gun, gvp, gvn, gwp, and gwn The method of making the numbers different from each other is not limited to that exemplified in the first embodiment. For example, a means (microcomputer) for performing software processing instead of a dedicated logic circuit is provided on the high voltage system side, and based on the number of appearances of the pulse signal output from the photocoupler 30 within a unit time, the drive signals gup, gun, Rising and falling edges of gvp, gvn, gwp, and gwn may be identified. In this case, the number of appearances can be a number of 3 or more.

  In the second embodiment, except for the inverter 52, the D flip-flop 58 may capture a signal input from the input terminal in synchronization with the falling edge of the delay signal V3. In this case, the defining signal having the wider pulse width defines the falling edge of the drive signal.

  By outputting the logical value of the other signal in synchronization with the edge of one of the signal output to the high-voltage system side via the photocoupler 30 and the delayed signal, the drive signals gup, gun, Means for generating gvp, gvn, gwp, and gwn are not limited to those exemplified in the above embodiments and their modifications. For example, in the second embodiment (configuration of FIG. 4), the regulation signal of the first embodiment (input signal Vin of FIG. 2A) may be used. In this case, the single pulse signal p1 can be a signal that defines the falling edge of the output signal Vout, and the two pulse signals p2 and p3 that are fired can be the signals that define the rising edge of the output signal Vout. At this time, the delay time τ is set so that the rising edge of the delay signal V3 of the leading pulse signal p2 of the two pulse signals p2 and p3 that are fired overlaps with the inverted signal V1 of the backward pulse signal p3.

  The means for generating the drive signals gup, gun, gvp, gvn, gwp, and gwn from the signal output to the high-voltage system side via the photocoupler 30 is not limited to the one having a delay circuit. For example, the output signal of the photocoupler 30 may be taken into the clock terminal of the counter 54, and the output signal of the counter 54 may be the drive signals gup, gun, gvp, gvn, gwp, gwn. In this case, the defining signal that defines the rising and falling edges of the drive signals gup, gun, gvp, gvn, gwp, and gwn can be a single pulse having the same pulse width.

  The on-vehicle power conversion circuit is not limited to the inverter 12. For example, a DC-DC converter that steps down the power of the high-voltage battery 14 and outputs it to the low-voltage battery 18 may be used.

  -Photocouplers are not limited to those that transmit signals from the in-vehicle low-voltage system to the in-vehicle high-voltage system. At this time, even if a signal is transmitted from the high-pressure system to the low-pressure system, the on-time of the photocoupler can be shortened according to the present invention, and the life of the photocoupler can be extended.

The figure which shows the whole structure of the control system concerning 1st Embodiment. The figure which shows the structure of the signal propagation apparatus concerning the embodiment. The time chart which shows the signal propagation aspect concerning the embodiment. The figure which shows the structure of the signal propagation apparatus concerning 2nd Embodiment. The time chart which shows the signal propagation aspect concerning the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motor generator, 12 ... Inverter, 14 ... High voltage battery, 16 ... Interface, 18 ... Low voltage battery, 20 ... Microcomputer, 30 ... Photocoupler, 54 ... Counter, 56 ... Delay circuit, 58 ... D flip-flop.

Claims (8)

In a signal propagation device for transmitting a binary propagation target signal of logic “H” and logic “L” from one of a high-pressure system and a low-pressure system to the other,
A defining signal that is a plurality of pulse signals having a pulse width shorter than a period of logic “H” and logic “L” of the propagation target signal and that defines rising and falling of the propagation target signal is A generation means for generating the propagation target signal from a signal output from the photocoupler in the other system when input from one system to the photocoupler ;
The prescribed signal is a signal propagation device and the number of pulse signals for defining the fall of the number and the propagation target signal of the pulse signal for defining the rise of the propagation target signal and said Rukoto different from each other .   The generation means includes delay means for delaying a signal on the output side of the photocoupler, and one of a signal that passes through the delay means and a signal that does not pass among the signals on the output side of the photocoupler. 2. The signal propagation device according to claim 1, wherein a logic value of the other signal is output in synchronization with an edge of the signal. The generating means inverts a logical value in synchronization with either a rising edge or falling edge of a signal on the output side of the photocoupler, delay means for delaying a signal on the output side of the photocoupler, and A counter that is initialized in synchronization with either the rising edge or falling edge of the output signal of the delay means, and the output of the counter in synchronization with either the rising edge or falling edge of the output of the delay means. signal propagation device according to claim 1, wherein further comprising a flip-flop to capture. In a signal propagation device for transmitting a binary propagation target signal of logic “H” and logic “L” from one of a high-pressure system and a low-pressure system to the other,
A defining signal that is a plurality of pulse signals having a pulse width shorter than a period of logic “H” and logic “L” of the propagation target signal and that defines rising and falling of the propagation target signal is A generation means for generating the propagation target signal from a signal output from the photocoupler in the other system when input from one system to the photocoupler;
The defining signal is different from the pulse width of the pulse signal for defining the rising edge of the propagation target signal and the pulse width of the pulse signal for defining the falling edge of the propagation target signal,
The generating means delays the signal on the output side of the photocoupler, and the value of the signal on the output side of the photocoupler in synchronization with either the rising edge or falling edge of the output signal of the delay means And a flip-flop that captures
The signal propagation device , wherein the flip-flop has a function of turning off the output of the flip-flop when any one of the outputs of the delay means is not input for a predetermined time or more . The generating means delays the signal on the output side of the photocoupler, and the value of the signal on the output side of the photocoupler in synchronization with either the rising edge or falling edge of the output signal of the delay means The signal propagation device according to claim 1, further comprising: a flip-flop that captures the signal. 6. The signal propagation device according to claim 5 , wherein the flip-flop has a function of turning off the output of the flip-flop when any one of the outputs of the delay means is not input for a predetermined time or more. The high-voltage system is configured with an on-vehicle power conversion circuit,
The propagation target signal, the signal propagation device according to any one of claims 1 to 6, characterized in that a signal for driving the switching elements of the power converter circuit. A signal propagation device according to claim 7 ;
A power conversion system comprising the power conversion circuit.

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