JPWO2020050319A1 - Switching drive circuit and electrical equipment - Google Patents

Abstract

The switching drive circuit (100) includes at least a hysteresis delay circuit that performs a hysteresis delay process on the control signal. The hysteresis delay circuit includes a charge / discharge circuit (101), a comparator (102) and a feedback circuit (104). This provides a drive circuit configuration that performs hysteresis delay processing and provides protection against switching drive circuits and / or driven devices in the form of hardware.

Description

The present invention relates to the technical field of circuits, especially to switching drive circuits and electrical devices.

Conventionally, a driven device (for example, a relay) can be switched and driven by using a switching drive circuit. For example, a switching drive circuit can generate a high or low electrical level and control it on (ON; may be expressed as ON) or OFF (OFF; may be expressed as cutoff). can.

In general, a switching drive circuit includes a circuit that realizes functions such as sampling, judgment processing, and driving.

The above contents regarding the background technology are merely for the purpose of clearly and completely explaining the technical configuration of the present invention and contributing to the understanding of those skilled in the art. These technical configurations should not be recognized as known to those skilled in the art because they are described in the background art section of this specification.

The present inventor has found that the drive signal needs to be delayed for a certain period of time in order to protect the driven device, other circuits, or the load. However, the conventional switching drive circuit is not suitable for circuit protection because there is no circuit configuration for performing hysteresis delay processing.

To solve the above problems, an embodiment of the present invention provides a switching drive circuit and an electric device.

According to the first aspect of the embodiment of the present invention, the switching drive circuit includes at least a hysteresis delay circuit that performs a hysteresis delay process on a control signal and controls a driven device, and the hysteresis delay circuit is a switching drive circuit. ,
A charging / discharging circuit in which the charging resistance value used at the time of charging and the discharging resistance value used at the time of discharging are different from each other, and includes at least a capacitor that is charged from a power source based on the control signal or discharged based on the control signal. With the discharge circuit
A comparator whose first input end is connected to one end of the capacitor, compares the potential at one end of the capacitor with a reference potential, and outputs a drive signal via the output end.
A switching drive circuit comprising at least a feedback circuit including feedback electrical resistance, one end of which is connected to the first input end of the comparator and the other end of which is connected to the output end of the comparator. offer.

Further, according to the second aspect according to the embodiment of the present invention, there is provided an electric device including a power supply, a driven device, and the switching drive circuit described above.

The present invention has the following beneficial effects. That is, the switching drive circuit includes at least a hysteresis delay circuit that performs a hysteresis delay process on the control signal, and the hysteresis delay circuit includes a charge / discharge circuit, a comparator, and a feedback circuit. Therefore, according to an embodiment of the present invention, by providing a circuit configuration that performs hysteresis delay processing, protection against a switching drive circuit and / or a driven device is realized in the form of hardware, and at the same time, delay under different loads is provided. It can meet the user demand for the function.

It is a schematic diagram of the hysteresis delay circuit which concerns on embodiment of this invention. It is a schematic diagram of the switching drive circuit which concerns on embodiment of this invention. It is a figure which shows an example of the hysteresis sampling circuit which concerns on embodiment of this invention. It is a figure which shows an example of the hysteresis delay circuit which concerns on embodiment of this invention. It is a figure which shows an example of the rating non-excess holding circuit which concerns on embodiment of this invention.

Specific embodiments of the present invention will be disclosed in detail by reference to the contents and drawings described below, and ideas for adopting the principles of the present invention will be clarified. It should be understood that the scope of the embodiments of the present invention is not limited by the contents and drawings described below. Also, within the spirit and provisions of the appended claims, embodiments of the present invention include various modifications, modifications and equal configurations.

Also, the features described and / or disclosed for one embodiment apply to one or more other embodiments in a similar or similar manner and are combined with or combined with features in the other embodiment. It can be substituted for the features in the embodiment.

Also, as used herein, the expression "include / include" means the presence of a feature, an entire member, a step or an assembly. However, it does not preclude the presence or addition of one or more other features, whole members, steps or assemblies.

In addition, the drawings that contribute to a further understanding of the embodiments of the present invention form a part of the specification, and are for describing the principle of the present invention together with wording while exemplifying the embodiments of the present invention. Needless to say, the drawings described below merely show some embodiments of the present invention, and those skilled in the art can find another drawing from the drawings without any creative effort. can.

The above-mentioned features and other features of the present invention will be further clarified by the drawings and the contents of the specification below. In addition, specific embodiments of the present invention are specifically disclosed in the specification and drawings, which means that some embodiments based on the principles of the present invention can also be adopted in the present invention. It should be understood that the present invention is not limited to the embodiments described, but rather includes all modifications, modifications and equal configurations within the appended claims.

Further, in the embodiment of the present invention, expressions such as "first" and "second" are for distinguishing different elements by title, and mean a spatial arrangement or a temporal order of these elements. It's not a thing. Therefore, these elements should not be limited to such terms. Also, the expression "and / or" means one element, a plurality of elements, or all combinations thereof listed as related to each other. Expressions such as "include," "include," and "have" mean the presence of the described features, elements, elements, or assemblies. However, it does not preclude the presence or addition of one or more other features, elements, elements or assemblies.

Further, in the embodiment of the present invention, the singular expressions such as "one" and "corresponding" should be understood as "one type" or "one classification" in a broad sense including the plural form. It should not be limited to the meaning of "one". It should also be understood that the expression "above" includes both the singular and the plural, unless explicitly stated in the context. Furthermore, unless explicitly stated in the context, the expression "by ..." should be understood as "at least in part, by ..." and the expression "based on ..." is "based on ...". At least in part, it depends. "

[Example 1]
The first embodiment of the present invention provides a hysteresis delay circuit that generates a drive signal by performing a hysteresis delay process on a control signal. The hysteresis delay circuit may be included in a switching drive circuit that controls the driven device.

FIG. 1 is a schematic diagram of a hysteresis delay circuit (switching drive circuit) according to an embodiment of the present invention. As shown in FIG. 1, the hysteresis delay circuit (switching drive circuit 100) includes a charge / discharge circuit 101, a comparator 102, and a feedback circuit 104.

The charge / discharge circuit 101 is a charge / discharge circuit 101 in which the charge resistance value used at the time of charging and the discharge resistance value used at the time of discharge are different from each other. A capacitor 1011 that is charged from a power source 110 (for example, 12V) via a second electrical resistance 107 based on (denoted as NR1) or discharged via the first electrical resistance 1012 based on the control signal NR1. At least include.

The comparator 102 is a comparator 102 in which a first input end 1021 (for example, a “+” end) is connected to one end of the capacitor 1011 and a second input end 1022 (for example, a “−” end) is connected to a reference potential. The potential at one end of the capacitor 1011 is compared with the reference potential, and the drive signal (hereinafter referred to as DR1) is output via the output terminal 1023.

The feedback circuit 104 is a feedback circuit 104 including at least a feedback electrical resistance 1041, one end of which is connected to the first input end 1021 of the comparator 102 and the other end of which is connected to the output end 1023 of the comparator 102. There is.

The capacitor 1011 may be discharged via the feedback electric resistance 1041 based on the control signal NR1.

In this embodiment, when the control signal NR1 changes (for example, when it changes from a low level to a high level, or when it changes from a high level to a low level), the charge / discharge circuit 101 charges / discharges the comparator 102. Since the change of the drive signal DR1 at the output terminal 1023 causes a delay of a different time as compared with the change of the control signal NR1, a signal delay of a different time is realized.

Thereby, the embodiment of the present invention can provide a circuit configuration for performing hysteresis delay processing, so that protection against a switching drive circuit and / or a driven device can be realized at the same time in the form of hardware. It is possible to meet the user's demand for the delay function under different loads. Further, according to the feedback circuit 104, the voltage can be divided by the feedback electric resistance 1041 at the time of charging, so that the reliability of the circuit can be improved and the state of the output end of the comparator 102 can be stabilized.

In this embodiment, the hysteresis delay circuit (switching drive circuit 100) delays the hysteresis for the first time (for example, 500 to 800 milliseconds) with respect to the control signal NR1, and the driven device is the driven device. A configuration that operates by the drive signal DR1 after a first time delay is possible. Further, the hysteresis delay circuit (switching drive circuit 100) delays the hysteresis for the second time (for example, 20 to 30 milliseconds) with respect to the control signal NR1, and the driven device performs the second time. It is possible to configure the device to be turned off by the drive signal DR1 after the delay.

Further, in this embodiment, the capacitor 1011 may be charged via the power supply 110 and the second electric resistance 107, or the capacitor 1011 may be discharged via the first electric resistance 1012 and / or the feedback electric resistance 1041. good. For example, by setting the resistance value of the first electric resistance 1012, the resistance value of the second electric resistance 107, and the capacitance value of the capacitor 1011 and making the charging time and the discharging time of the charge / discharge circuit 101 different, the first time and the first time are different. It may be different from 2 hours.

As a result, it is possible to control the driven device at different times during operation and off, so that it is possible not only to realize circuit protection but also to further satisfy the demand for switching drive. For example, in the case of a relay, operation at a high voltage and a delay of a certain length of time are required at the time of input, and at the time of a power failure, the voltage is turned off at an undervoltage point and a delay of a certain degree of time is short. However, according to the configuration of the embodiment of the present invention, these requirements can be satisfied.

Although FIG. 1 describes an example in which the first electric resistance 1012 and / or the feedback electric resistance 1041 is used as a discharge resistance and the second electric resistance 107 is used as a charging resistance, the present invention is not limited thereto. For example, the first electric resistance 1012 is omitted and the capacitor 1011 is directly grounded at the time of discharging, or the second electric resistance 107 is omitted and the capacitor 1011 is directly connected to the power supply 110 at the time of charging. May be good. By making the charging resistance value used at the time of charging the charging / discharging circuit 101 different from the discharging resistance value used at the time of discharging, the first time and the second time can be made different.

In one embodiment, as shown in FIG. 1, the feedback circuit 104 may further include a diode 1042 in which the positive electrode is connected to the feedback electrical resistance 1041 and the negative electrode is connected to the output end 1023.

By using the diode 1042, the flow direction of the signal can be defined and the stability of the drive signal can be further improved. The configuration of the feedback circuit 104 is not limited to this, and for example, the positive electrode of the diode 1042 may be connected to the first input terminal 1021 and the negative electrode may be connected to the feedback electric resistance 1041.

In this embodiment, the reference potential at the second input terminal 1022 of the comparator 102 may be invariant (eg, 6V, 8V, etc.) and may be configurable or variable. Further, the reference potential may be based on the power source 110.

In one embodiment, as shown in FIG. 1, the switching drive circuit 100 may further include a third electrical resistance 103 and a fourth electrical resistance 105.

One end of the third electric resistance 103 is connected to the power supply 110, and the other end is connected to the second input terminal 1022 of the comparator 102. The fourth electric resistance 105 is a fourth electric resistance 105 connected to the third electric resistance 103 and the second input terminal 1022, and by dividing the voltage of the power supply 110 in collaboration with the third electric resistance 103. , The reference potential is formed at the second input end 1022.

As a result, since the two input terminals 1021 and 1022 of the comparator 102 are both connected to the same reference power supply 110, one reference input terminal can be omitted, which is advantageous for making the circuit compact. Further, since the two input terminals 1021 and 1022 both refer to the same reference power supply 110, the delay adjustment accuracy is further improved.

For example, in the case where one reference power supply for a comparator is simply provided, if the threshold voltage of the comparator is increased (for example, changed from 6V to 8V) and the reference power supply 110 is unchanged (for example, maintained at 12V), the capacitor Since the charging speed of the capacitor does not change, the time length of the delay changes significantly, which is disadvantageous for highly accurate adjustment for the delay. Further, in this case, if the voltage of the reference power supply 110 is to be increased (for example, changed from 12V to 16V), it is necessary to adjust the reference power supply and the reference power supply 110 of the comparator, respectively, and an error is likely to occur. It is still disadvantageous for the adjustment of.

On the other hand, according to the embodiment of the present invention, only the voltage of the reference power supply needs to be adjusted (for example, changed from 12V to 16V), and the voltage of the second input terminal 1022 changes accordingly (for example, from 6V to 8V). (Changes), and at the same time, the charging speed of the capacitor 1011 also increases. Therefore, in the embodiment of the present invention, the amount of increase in the delay time length is smaller than that in the case of simply providing one reference power source, so that the adjustment accuracy is higher.

In one embodiment, as shown in FIG. 1, the switching drive circuit 100 may further include a fifth electrical resistance 106 connected to the power supply 110 and the output end 1023.

As a result, the two input terminals 1021 and 1022 of the comparator and the output terminal 1023 both refer to the same reference power supply 110, so that the delay adjustment accuracy is further improved.

Note that FIG. 1 is merely for schematically explaining an embodiment of the present invention, and the present invention is not limited thereto. Further, it should be understood that the member or element shown in FIG. 1 is merely an example. For example, the connection form or position of these members or elements may be adjusted and / or some members or elements may be omitted and / or members or elements not shown in FIG. 1 may be added.

Each of the above examples or embodiments is merely an exemplary description of an embodiment of the present invention. The present invention is not limited to this, and appropriate modifications may be made based on each of the above-described examples or embodiments. For example, the above-mentioned examples or embodiments may be used alone, or one or a plurality of the above-mentioned examples or embodiments may be combined.

As can be seen from the above-described embodiment, the switching drive circuit includes at least a hysteresis delay circuit that performs a hysteresis delay process on the control signal, and the hysteresis delay circuit includes a charge / discharge circuit, a comparator, and a feedback circuit. Therefore, the embodiments of the present invention can provide protection against switching drive circuits and / or driven devices in the form of hardware by providing a circuit configuration that performs hysteresis delay processing, while at the same time under different loads. It is possible to meet the user's demand for the delay function of.

[Example 2]
The second embodiment of the present invention provides a switching drive circuit that controls a driven device. In this embodiment, the description will be based on the configuration of the first embodiment, but the same description as that of the first embodiment will be omitted.

FIG. 2 is a schematic diagram of a switching drive circuit according to an embodiment of the present invention. As shown in FIG. 2, the switching drive circuit 200 includes a hysteresis sampling circuit 201 that generates a control signal NR1 by performing hysteresis sampling on an input signal. The input signal may be a signal obtained by measuring the bus voltage after the rectification filtering, or may be a signal of the bus voltage after the rectification filtering. The present invention is not limited to this, and the specific embodiment of the input signal may take into consideration the related art.

In this embodiment, the driven device is, for example, an IGFET (Insulated Gate Field Effect Transistor), a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), or an IGBT (Insulated Gate Bipolar). It may be a transistor such as Transistor (isolated gate bipolar transistor). Further, the driven device may be a relay, a servo electric motor, or the like. However, the present invention is not limited to this.

FIG. 3 is a diagram showing an example of the hysteresis sampling circuit 201 according to the embodiment of the present invention. For convenience, FIG. 3 shows only the circuit configuration of the portion where the hysteresis processing is performed, and does not show the details of signal sampling, but the details of signal sampling may refer to related techniques.

As shown in FIG. 3, the hysteresis sampling circuit 201 includes a charge / discharge circuit 301 and a comparator 302.

The charge / discharge circuit 301 includes at least an electrical resistance 3012 and a capacitor 3011 that is charged based on the input signal or discharged via the electrical resistance 3012. The comparator 302 compares the potential at one end of the capacitor 3011 with the voltage dividing potential after dividing the voltage with respect to the power supply 310 (for example, 12V), and outputs a comparison result to be subjected to the hysteresis sampling. The voltage dividing potential is obtained by dividing the voltage of the power supply 310 using the electric resistors 304 and 305.

Further, as shown in FIG. 3, the hysteresis sampling circuit 201 may further include a feedback circuit 303 including an electric resistance 3031 and a diode 3032.

Hereinafter, the operating principle of the hysteresis sampling circuit 201 will be briefly described.

For example, when a signal voltage is input, the capacitor 3011 is charged by the voltage division by the electric resistance. Then, when the potential at one end of the capacitor 3011 exceeds the voltage dividing potential, a low level control signal NR1 is output from the output end of the comparator 302. Further, when the input signal is at a low level or the voltage drops, the capacitor 3011 is discharged or voltage dropped through the electric resistance 3012 due to the voltage division by the electric resistance. Then, when the potential at one end of the capacitor 3011 falls below the voltage dividing potential, a high level control signal NR1 is output from the output end of the comparator 302.

As a result, hysteresis processing can be performed on the control signal, noise generated by voltage fluctuation can be removed, and stability of the control signal can be improved.

In one embodiment, the hysteresis sampling circuit 201 can sample the input signal using the first sampling threshold and generate a control signal that activates the driven device. Further, the hysteresis sampling circuit 201 can sample the input signal using the second sampling threshold value and generate a control signal for turning off the driven device.

As a result, it is possible to perform different sampling of the driven device at the time of operation and at the time of off, so that it is possible not only to realize circuit protection but also to further satisfy the demand for switching drive.

Note that FIG. 3 is merely for schematically explaining an embodiment of the present invention, and the present invention is not limited thereto. Further, it should be understood that the member or element shown in FIG. 3 is merely an example. For example, the connection form or position of these members or elements may be adjusted and / or some members or elements may be omitted and / or members or elements not shown in FIG. 3 may be added.

As shown in FIG. 2, the switching drive circuit 200 may further include a hysteresis delay circuit 202 that generates a drive signal by performing a hysteresis delay process on the control signal. The specific configuration of the hysteresis delay circuit 202 may be referred to Example 1.

FIG. 4 shows an example of the hysteresis delay circuit 202 according to the embodiment of the present invention, and is a diagram for explaining the hysteresis delay circuit 202 in more detail. As shown in FIG. 4, the hysteresis delay circuit 202 includes a charge / discharge circuit 401, a comparator 402, and a feedback circuit 404.

The charging / discharging circuit 401 is charged from the power supply 410 (for example, 12V) based on the electric resistance 4012 and the control signal (hereinafter referred to as NR1), or the electric resistances 4012, 4041 and the like are charged based on the control signal NR1. It includes at least a capacitor 4011 (in FIG. 4, for example, three are shown) that discharges through the capacitor.

In the comparator 402, one input end (for example, "+" end) is connected to one end of the capacitor 4011, and the other input end (for example, "-" end) is connected to the power supply 410 via an electric resistance 403. In the comparator 402, the potential at one end of the capacitor 4011 is compared with the voltage dividing potential (reference potential) after the voltage is divided with respect to the power supply 410, and the drive signal (hereinafter referred to as DR1) is referred to via the output end. ) Is output.

The feedback circuit 404 is a feedback circuit 404 in which one end is connected to one input end (“+” end) of the comparator 402 and the other end is connected to the output end of the comparator 402. Includes a diode 4042 with a positive electrode connected to the electrical resistance 4041 and a negative electrode connected to the output end of the comparator 402.

Further, as shown in FIG. 4, the hysteresis delay circuit 202 may further include an electric resistance 405. The electric resistance 405 is an electric resistance 405 connected to the electric resistance 403 and the other input end (“−” end) of the comparator 402, and by dividing the voltage of the power supply 410 in collaboration with the electric resistance 403, the electric resistance 405 is divided. The voltage dividing potential is formed at the second input end 4022.

Further, as shown in FIG. 4, the hysteresis delay circuit 202 may further include an electric resistance 406 connected to the power supply 410 and the output end. The charge / discharge circuit 401 may further include an electric resistance 407 connected to the power supply 410 and one end of the capacitor 4011.

Further, as shown in FIG. 4, the hysteresis delay circuit 202 may further include switching elements 408 and 409.

Hereinafter, the operating principle of the hysteresis delay circuit 202 will be briefly described.

For example, when the control signal NR1 is at a low level, the switching element 409 is turned off and the power supply 410 charges the capacitor 4011. Then, when the potential at the power supply 410 side end of the capacitor 4011 exceeds the voltage dividing potential, a high level drive signal DR1 is output from the output end of the comparator 402. Further, when the control signal NR1 is at a high level, the switching element 409 conducts, and the capacitor 4011 discharges mainly through the electric resistance 4012. Then, when the potential at the power supply 410 side end of the capacitor 4011 falls below the voltage dividing potential, a low level drive signal DR1 is output from the output end of the comparator 402.

As shown in FIG. 2, the switching drive circuit 200 further includes a non-rating factor holding circuit 203 that performs a rating non-excess processing based on the drive signal so that the driven device is held in the non-rating state. It may be included.

FIG. 5 is a diagram showing an example of the rating non-excess holding circuit 203 according to the embodiment of the present invention. For convenience, FIG. 5 shows only the circuit configuration of the portion where the non-rating overload holding process is performed, but more specific members or elements may take into consideration the related technology.

For example, when the switching elements 502 and 503 are conducted under the action of the drive signal DR1, the voltage of the power supply 510 (for example, 12V) is directly applied to the relay 501 to operate (ON) the relay 501, and the capacitor 504 is operated from the power supply 510. It will be charged. Then, after charging for a certain period of time, when the voltage of the capacitor 504 reaches a predetermined value, the switching element 503 is turned off, and the voltage of the power supply 510 divided by the electric resistance 505 (for example, changing from 12V to 10V) is transferred to the relay 501. It is applied.

As a result, the driven device can be used in a state where the rating is not exceeded, so that the power consumption of the driven device can be reduced and the service life of the driven device can be extended.

It should be noted that FIGS. 2 to 5 are merely for schematically explaining examples of the present invention, and the present invention is not limited thereto. Further, it should be understood that the members or elements shown in FIGS. 2 to 5 are merely examples. For example, the connection form or position of these members or elements may be adjusted and / or some members or elements may be omitted and / or members or elements not shown in FIGS. 2 to 5 may be added. ..

Further, the description of the circuit principle of FIGS. 3 to 5 is merely an example, and the present invention is not limited thereto.

As can be seen from the above-described embodiment, the switching drive circuit includes at least a hysteresis sampling circuit and a hysteresis delay circuit. Therefore, the embodiments of the present invention can provide protection against switching drive circuits and / or driven devices in the form of hardware by providing a circuit configuration that performs hysteresis sampling and hysteresis delay processing. It is possible to meet the user's demand for the delay function under different loads.

[Example 3]
In the embodiment of the present invention, an electric device including the hysteresis delay circuit disclosed in the first embodiment or the switching drive circuit disclosed in the second embodiment is further provided. Since the configuration of the hysteresis delay circuit or the switching drive circuit has already been described in detail in Examples 1 and 2 as described above, it is assumed that the content of the configuration is included in the present specification. Omit.

In this embodiment, the electrical product may be a home appliance or an industrial device. However, this embodiment is not limited to this. For example, in another embodiment, the switching drive circuit of the second embodiment may be used as a drive device for a relay, a drive device for various information devices, a drive device for industrial equipment, and the like.

〔summary〕
According to the first aspect of the embodiment of the present invention, the switching drive circuit includes at least a hysteresis delay circuit that performs a hysteresis delay process on a control signal and controls a driven device, and the hysteresis delay circuit is a switching drive circuit. ,
A charging / discharging circuit in which the charging resistance value used at the time of charging and the discharging resistance value used at the time of discharging are different from each other, and includes at least a capacitor that is charged from a power source based on the control signal or discharged based on the control signal. With the discharge circuit
A comparator whose first input end is connected to one end of the capacitor, compares the potential at one end of the capacitor with a reference potential, and outputs a drive signal via the output end.
A switching drive circuit comprising at least a feedback circuit including feedback electrical resistance, one end of which is connected to the first input end of the comparator and the other end of which is connected to the output end of the comparator. offer.

According to the above configuration, it is possible to provide a circuit configuration for performing hysteresis delay processing, and it is possible to realize protection against a switching drive circuit and / or a driven device in the form of hardware. Further, according to the feedback circuit, the feedback electric resistance can be used to divide the voltage in the case of charging, and the state of the output end of the comparator can be stabilized, so that the reliability of the circuit can be improved. ..

In one embodiment, the hysteresis delay circuit delays the hysteresis for the first time with respect to the control signal, and the driven device operates with the drive signal after the first time delay, and / Alternatively, the hysteresis delay circuit delays the second time hysteresis with respect to the control signal, and the driven device is turned off by the drive signal after the second time delay.

According to the above configuration, it is possible to control the driven device at different times during operation and off, so that it is possible not only to realize circuit protection but also to further satisfy the demand for switching drive.

In one embodiment, the charge / discharge circuit further comprises a first electrical resistance, which is a discharge resistance connected to the capacitor, and / or a second electrical resistance, which is a charging resistance connected to the power supply and the capacitor. ..

According to the above configuration, in the charge / discharge circuit, the charge resistance value used at the time of charging and the discharge resistance value used at the time of discharge can be made different, so that it is possible to provide a circuit configuration for performing hysteresis delay processing.

In one embodiment, in the feedback circuit, a diode in which a positive electrode is connected to the feedback electric resistance and a negative electrode is connected to the output end, or a positive electrode is connected to the first input end and a negative electrode is connected to the feedback electric resistance. Further includes a diode connected to.

According to the above configuration, the flow direction of the signal can be defined and the stability of the drive signal can be further improved.

In one embodiment, the hysteresis delay circuit has a third electrical resistance, one end of which is connected to the power supply and the other end of which is connected to the second input end of the comparator, and the third electrical resistance and the second input end. A fourth electrical resistance connected to the above, further including a fourth electrical resistance that divides the power supply in collaboration with the third electrical resistance so that the reference potential is formed at the second input end. ..

According to the above configuration, since the two input ends of the comparator are both connected to the same reference power supply, one reference input end can be omitted, which is advantageous for making the circuit compact. Further, since the two input terminals both refer to the same reference power supply, the delay adjustment accuracy is further improved.

In one embodiment, the hysteresis delay circuit further includes a fifth electrical resistance connected to the power supply and the output end.

According to the above configuration, since the two input ends and the output ends of the comparator both refer to the same reference power supply, the delay adjustment accuracy is further improved.

In one embodiment, the switching drive circuit further includes a hysteresis sampling circuit that generates the control signal by performing hysteresis sampling on the input signal.

According to the above configuration, the control signal can be subjected to hysteresis processing, noise generated by voltage fluctuation can be removed, and the stability of the control signal can be improved.

In one embodiment, the hysteresis sampling circuit generates a control signal that activates the driven device by sampling the input signal using a first sampling threshold, and / or the hysteresis sampling circuit. By sampling the input signal using the second sampling threshold, a control signal for turning off the driven device is generated.

According to the above configuration, it is possible to perform different sampling of the driven device at the time of operation and at the time of off, so that not only the realization of circuit protection but also the demand for switching drive can be further satisfied.

In one embodiment, the switching drive circuit further includes a non-rated overrated holding circuit that performs a non-rated overrated process based on the drive signal so that the driven device is held at the non-rated overrated state.

According to the above configuration, since the driven device can be used in a state where the rating is not exceeded, the power consumption of the driven device can be reduced and the service life of the driven device can be extended.

In one embodiment, the driven device includes at least one of a relay, a servo electric motor, an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, and the like.

Further, according to the second aspect according to the embodiment of the present invention, there is provided an electric device including a power supply, a driven device, and the switching drive circuit described above.

Although the present invention has been described above with reference to specific embodiments, these descriptions are merely exemplary and do not limit the scope of protection of the present invention. Further, a person skilled in the art can make various modifications and changes to the present invention based on the spirit and principle of the present invention. Such modifications and modifications are also included in the scope of the present invention.

Claims (11)

A switching drive circuit that controls a driven device, including at least a hysteresis delay circuit that performs hysteresis delay processing on the control signal.
The hysteresis delay circuit
A charge / discharge circuit in which the charge resistance value used at the time of charging and the discharge resistance value used at the time of discharge are different, and includes at least a capacitor that is charged from a power source based on the control signal or discharged based on the control signal. Circuit and
A comparator whose first input end is connected to one end of the capacitor, compares the potential at one end of the capacitor with a reference potential, and outputs a drive signal via the output end.
A feedback circuit that includes at least feedback electrical resistance, one end connected to the first input end of the comparator and the other end connected to the output end of the comparator.
A switching drive circuit, characterized in that it contains. The hysteresis delay circuit delays the hysteresis for the first time with respect to the control signal, and the driven device operates with the drive signal after the delay for the first time.
And / or
The hysteresis delay circuit performs a delay for hysteresis for the second time with respect to the control signal, and the driven device is turned off by the drive signal after the delay for the second time.
The switching drive circuit according to claim 1. The charge / discharge circuit further includes a first electrical resistance, which is a discharge resistance connected to the capacitor, and / or a second electrical resistance, which is a charging resistance connected to the power supply and the capacitor.
The switching drive circuit according to claim 1. In the feedback circuit, a diode in which a positive electrode is connected to the feedback electric resistance and a negative electrode is connected to the output end, or a diode in which a positive electrode is connected to the first input end and a negative electrode is connected to the feedback electric resistance. Including,
The switching drive circuit according to claim 1. The hysteresis delay circuit
A third electrical resistor, one end connected to the power supply and the other end connected to the second input end of the comparator.
The fourth electric resistance connected to the third electric resistance and the second input end, and the power source is jointly with the third electric resistance so that the reference potential is formed at the second input end. Further includes a fourth electrical resistance that divides the voltage,
The switching drive circuit according to claim 1. The hysteresis delay circuit further includes a fifth electrical resistance connected to the power supply and the output end.
The switching drive circuit according to claim 1. The switching drive circuit
A hysteresis sampling circuit that generates the control signal by performing hysteresis sampling on the input signal is further included.
The switching drive circuit according to any one of claims 1 to 6. The hysteresis sampling circuit generates a control signal for operating the driven device by sampling the input signal using the first sampling threshold value.
And / or
The hysteresis sampling circuit uses a second sampling threshold to sample the input signal to generate a control signal that turns off the driven device.
The switching drive circuit according to claim 7. The switching drive circuit
Further including a non-rating over-rating holding circuit that performs a non-rating over-rating processing based on the driving signal so that the driven device is held at the non-rating over-rating state.
The switching drive circuit according to any one of claims 1 to 6. The driven device includes at least one of a relay, a servo electric motor, an insulated gate bipolar transistor, and a metal oxide semiconductor field effect transistor.
The switching drive circuit according to any one of claims 1 to 6. An electrical device comprising a power supply, a driven device, and a switching drive circuit according to any one of claims 1 to 10.

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