CN213783267U - PWM drive control circuit - Google Patents
PWM drive control circuit Download PDFInfo
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- CN213783267U CN213783267U CN202022281645.0U CN202022281645U CN213783267U CN 213783267 U CN213783267 U CN 213783267U CN 202022281645 U CN202022281645 U CN 202022281645U CN 213783267 U CN213783267 U CN 213783267U
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Abstract
The utility model discloses a PWM drive control circuit, which comprises an input module, a high-pass filtering module, a direct current conversion module, a coupling module and an output module which are connected in sequence; the output end of the direct current conversion module is electrically connected with the input end of the coupling module and the input end of the output module, and the output end of the output module is used for signal output; the input module generates PWM signals with high and low frequencies capable of being dynamically switched, and the PWM signals are filtered by the high-pass filtering module to enable the direct current conversion module to be switched on or switched off; when the PWM control circuit is conducted, the output module is communicated with the direct current conversion module, so that the output module outputs the low level of the PWM control signal; when the PWM control circuit is cut off, the output module is communicated with the coupling module, so that the output module outputs the high level of the PWM control signal. When the input module fails to generate a PWM signal with high and low frequencies capable of being dynamically switched, even if the output module still outputs signals, the output module still cannot generate the PWM control signal, and therefore a load connected with the output module is powered off.
Description
Technical Field
The utility model belongs to the technical field of the PWM drive, concretely relates to PWM drive control circuit.
Background
Pulse Width Modulation (PWM), an abbreviation of Pulse Width Modulation, is Pulse Width Modulation for short, is a very effective technology for controlling an analog module by utilizing digital output of a microprocessor, and is widely applied to many fields of measurement, communication, power control and conversion.
When the PWM output is used as a control signal, in view of safety, once the MCU of the control system runs abnormally, the corresponding PWM signal should also stop outputting, thereby ensuring that the load can be safely powered off when the control signal is lost; however, because the PWM of the MCU is an integrated module, although the MCU operates abnormally, the PWM module will continue to output signals, which results in loss of the original design purpose and potential safety hazard.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a PWM drive control circuit through the PWM signal that produces high low frequency dynamic switching, guarantees that the system can lose PWM signal, safe outage with the load that output module is connected when the operation is unusual.
The utility model adopts the technical proposal that:
a PWM driving control circuit comprises an input module, a high-pass filtering module, a direct current conversion module, a coupling module and an output module; the input module, the high-pass filtering module and the direct current conversion module are electrically connected in sequence, the output end of the direct current conversion module is electrically connected with the input end of the coupling module and the input end of the output module, and the output end of the output module is used for signal output;
the input module generates PWM signals with high and low frequencies capable of being dynamically switched, and the PWM signals are filtered by the high-pass filtering module to enable the direct current conversion module to be switched on or switched off; when the PWM control circuit is conducted, the output module is communicated with the direct current conversion module, so that the output module outputs the low level of the PWM control signal; when the PWM control circuit is cut off, the output module is communicated with the coupling module, so that the output module outputs the high level of the PWM control signal.
Preferably, the dc conversion module includes a first resistor R1, a first capacitor C1, and a first transistor Q1, a base of the first transistor Q1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the first capacitor C1, a common connection end of the first resistor R1 and the first capacitor C1 is connected to the high-pass filter module as an input end of the dc conversion module, the other end of the first capacitor C1 is connected to an emitter of the first transistor Q1 and grounded, and a collector of the first transistor Q1 is electrically connected to the input end of the coupling module and the input end of the output module as an output end of the dc conversion module.
Preferably, the first transistor Q1 is an NPN transistor.
Preferably, the coupling module includes second resistance R2 and power VCC, the one end of second resistance R2 is regarded as the input of coupling module with the output of direct current conversion module the input of output module all connects, the other end with power VCC connects.
Preferably, the output module includes a second capacitor C2, a third resistor R3 and an output end, one end of the second capacitor C2 is connected to the second resistor R2, a common connection end between the second capacitor C2 and the second resistor R2 serves as an input end of the output module, the output end of the dc conversion module and the input end of the coupling module are connected to each other, the other end of the second capacitor C2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 serves as an output end of the output module to output a signal.
Preferably, the high-pass filtering module is a high-pass filter.
Preferably, the high-pass filter includes a third capacitor C3 and a fourth resistor R4, one end of the third capacitor C3 is connected to the output end of the input module as the input end of the high-pass filter, the other end of the third capacitor C3 is connected to ground through the fourth resistor R4, and the other end of the third capacitor C3 is connected to the input end of the dc conversion module as the output end of the high-pass filter.
Preferably, the frequency of the PWM signal of high frequency meets the condition: f. ofH≥2fc；
Wherein f isHSaid PWM signal being of high frequencyFrequency of (f)cIs the cut-off frequency of the high-pass filter.
Preferably, the frequency of the PWM signal of low frequency meets the condition: f. ofL≤fc/2；
Wherein f isLThe frequency of the PWM signal being a low frequency.
Preferably, the input module is controlled by the MCU.
Compared with the prior art, when the utility model is used, the input module generates PWM signals with high and low frequencies which can be dynamically switched;
when the input module generates a high-frequency PWM signal, the signal is filtered by the high-pass filtering module to form a PWM control signal with extremely high reliability, the PWM control signal enables the direct current conversion module to be conducted, the output module is communicated with the direct current conversion module at the moment, and the voltage of the output module is the grounding voltage of the direct current conversion module, so that the low level of the PWM control signal is output;
when the input module generates a low-frequency PWM signal, the signal is filtered by the high-pass filtering module and then is filtered completely, so that the direct-current conversion module cannot be conducted, at the moment, the output module is connected with the coupling module, the voltage of the output module is the power supply voltage of the coupling module, and the high level of the PWM control signal is output;
the low level and high level interval outputs form a PWM signal, so far, the generation of a PWM control signal is realized.
When the input module fails and cannot generate PWM signals with high and low frequencies capable of being dynamically switched, the input module is abnormal, and even if the input module still outputs signals, the output module cannot generate the PWM signals because the output module cannot output low levels and high levels which alternately change, so that the load connected with the output module is powered off, and the safety of the load is further ensured.
Drawings
Fig. 1 is a system block diagram of a PWM driving control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a PWM driving control circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a high-pass filter in a PWM drive control circuit according to an embodiment of the present invention.
The system comprises an input module 1, a high-pass filtering module 2, a direct current conversion module 3, a coupling module 4 and an output module 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be clear that the terms "vertical", "horizontal", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or element referred to must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the utility model provides a PWM drive control circuit, as shown in fig. 1, it includes input module 1, high pass filter module 2, direct current conversion module 3, coupling module 4 and output module 5; the input module 1, the high-pass filtering module 2 and the direct current conversion module 3 are electrically connected in sequence, the output end of the direct current conversion module 3 is electrically connected with the input end of the coupling module 4 and the input end of the output module 5, and the output end of the output module 5 is used for signal output;
thus, with the structure, the input module 1 generates PWM signals with high and low frequencies capable of being dynamically switched, and the PWM signals are filtered by the high-pass filtering module 2 to enable the direct current conversion module 3 to be switched on or switched off; when the PWM control circuit is switched on, the output module 5 is communicated with the direct current conversion module 3, so that the output module 5 outputs the low level of the PWM control signal; when the PWM control circuit is cut off, the output module 5 is communicated with the coupling module 4, so that the output module 5 outputs the high level of the PWM control signal;
specifically, when the input module 1 generates a high-frequency PWM signal, the signal is filtered by the high-pass filter module 2 to form a PWM control signal with extremely high reliability, the PWM control signal turns on the dc conversion module 3, the output module 5 is connected to the dc conversion module 3, and the voltage of the output module is the ground voltage of the dc conversion module 3, so that the low level of the PWM control signal is output;
when the input module 1 generates a low-frequency PWM signal, the signal is filtered by the high-pass filter module 2, and then the signal is filtered, so that the dc conversion module 3 cannot be turned on, and at this time, the output module 5 is connected to the coupling module 4, and the voltage of the output module is the power voltage of the coupling module 4, so that the high level of the PWM control signal is output;
the low level and the high level are output at intervals to form a PWM signal, so that the generation of the PWM control signal is realized;
when the input module 1 fails to generate PWM signals with high and low frequencies capable of being dynamically switched, the input module 1 is abnormal;
if the input module 1 always generates a high-frequency PWM signal, the output module 5 cannot be coupled to the coupling module 4, and therefore always outputs a low level of the PWM control signal; if the input module 1 always generates a low-frequency PWM signal, the output module 5 cannot communicate with the dc conversion module 3, and therefore always outputs a high level of the PWM control signal; no matter whether the low level or the high level is always generated, the load connected with the output module 5 is powered off because the square wave with the high and low level change cannot be formed, and the safety of the load is further ensured.
In a specific embodiment, as shown in fig. 2, the dc conversion module 3 includes a first resistor R1, a first capacitor C1, and a first transistor Q1, a base of the first transistor Q1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the first capacitor C1, a common connection end of the first resistor R1 and the first capacitor C1 is connected to the high-pass filter module 2 as an input end of the dc conversion module 3, the other end of the first capacitor C1 is connected to an emitter of the first transistor Q1 and grounded, and a collector of the first transistor Q1 is electrically connected to an input end of the coupling module 4 and an input end of the output module 5 as an output end of the dc conversion module 3;
thus, when the input module 1 generates a high-frequency PWM signal, the signal is filtered by the high-pass filter module 2 to form a PWM control signal with extremely high reliability, and the signal generates a direct current after passing through the first capacitor C1, so that the first triode Q1 is turned on;
on the contrary, when the input module 1 generates a low-frequency PWM signal, the signal is filtered by the high-pass filtering module 2 to obtain any signal, so that the first transistor Q1 is in a cut-off state;
the switching on and off of the dc conversion module 3 is realized by the switching on and off of the first transistor Q1.
In an embodiment, the first transistor Q1 is an NPN transistor.
In a specific embodiment, the coupling module 4 includes a second resistor R2 and a power source VCC, one end of the second resistor R2 is used as an input end of the coupling module 4 and is connected to both the output end of the dc conversion module 3 and the input end of the output module 5, and the other end is connected to the power source VCC;
the main functions of the coupling module 4 are: when the first transistor Q1 is turned off, the coupling circuit 4 can provide a power voltage to the output module 5, so that the output module 5 generates a high-frequency PWM control signal, and therefore, the coupling circuit 4 needs to include a power VCC.
The output module 5 includes a second capacitor C2, a third resistor R3 and an output end, one end of the second capacitor C2 is connected to the second resistor R2, a common connection end between the second capacitor C2 and the second resistor R2 serves as an input end of the output module 5, an output end of the dc conversion module 3 and an input end of the coupling module 4 are connected to each other, the other end of the second capacitor C2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 serves as an output end output signal (OUT-PWM in fig. 2) of the output module 5.
The high-pass filtering module 2 is a high-pass filter;
as shown in fig. 3, the high pass filter includes a third capacitor C3 and a fourth resistor R4 connected to the input module 1, one end of the third capacitor C3 is connected to the output terminal of the input module 1 as the input terminal of the high pass filter, the other end of the third capacitor C3 is grounded through the fourth resistor R4, and the other end of the third capacitor C3 is connected to the input terminal of the dc conversion module 3 as the output terminal of the high pass filter;
in particular, the main functions of the high-pass filter are: the high-frequency signal can normally pass through, and the high-frequency signal lower than the set critical value is blocked and weakened;
in particular, the high-pass filtering can be simply considered as: a frequency point is set, which cannot pass when the signal frequency is higher than the frequency point, and in the digital signal, this frequency point is also a cut-off frequency, and when the frequency is lower than the cut-off frequency, all the frequency points are assigned to 0, and the frequency cannot pass.
The input module 1 generates a PWM signal with dynamically switchable high and low frequencies, wherein the frequency of the PWM signal with high frequency meets the condition: f. ofH≥2fc；
Wherein f isHFrequency of PWM signal of high frequency, fcThe cut-off frequency of the high-pass filter.
The input module 1 generates a PWM signal with a high frequency and a low frequency which can be dynamically switched, wherein the frequency of the PWM signal with the low frequency meets the condition: f. ofL≤fc/2；
Wherein f isLThe frequency of the PWM signal is a low frequency.
The circuit of the high-pass filter generally consists of a resistor and a capacitor, and the cutoff frequency of the high-pass filter is calculated by the following method:
fc＝1/(2πR4C3)
in the above formula, fcR4 and C3 are the resistance value of the resistor and the capacitance value of the capacitor constituting the high-pass filter, respectively, for the cutoff frequency of the high-pass filter.
The input module 1 is controlled by an MCU (micro controller Unit), and the MCU is called a Microcontroller Unit as a singlechip.
The working process is as follows:
initializing a single chip microcomputer, and generating a PWM signal with high and low frequencies capable of being dynamically switched;
when the single chip microcomputer generates a high-frequency PWM signal, the signal is filtered by the high-pass filtering module 2 to form a PWM control signal with extremely high reliability, and the signal generates direct current after passing through the first capacitor C1, so that the first triode Q1 is conducted; at this time, the first transistor Q1 is connected to the output module 5, and since the emitter of the first transistor Q1 is grounded, the voltage of the output module 5 is the voltage to ground at this time, and the output end outputs the low level of the PWM control signal;
when the singlechip generates a low-frequency PWM signal, the signal is filtered by the high-pass filtering module 2 to obtain any signal, so that the first triode Q1 is in a cut-off state; at this time, the coupling module 4 is communicated with the output module 5, and since the voltage of the coupling module 4 is the power supply voltage, the voltage of the output module 5 is the power supply voltage at this time, and the output end outputs the high level of the PWM control signal;
and repeating the process to generate the PWM square wave, thereby realizing the normal work of the PWM drive control load.
But this embodiment is through producing the PWM signal that high low frequency dynamic switching, guarantees that the system when the operation is unusual, and the load of being connected with output module can lose the PWM signal, and the safety outage has then guaranteed the safety of load.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A PWM driving control circuit is characterized by comprising an input module (1), a high-pass filtering module (2), a direct current conversion module (3), a coupling module (4) and an output module (5); the input module (1), the high-pass filtering module (2) and the direct current conversion module (3) are electrically connected in sequence, the output end of the direct current conversion module (3) is electrically connected with the input end of the coupling module (4) and the input end of the output module (5), and the output end of the output module (5) is used for signal output;
the input module (1) generates PWM signals with high and low frequencies capable of being dynamically switched, and the PWM signals are filtered by the high-pass filtering module (2) to enable the direct current conversion module (3) to be switched on or switched off; when the PWM control circuit is conducted, the output module (5) is communicated with the direct current conversion module (3) so that the output module (5) outputs the low level of the PWM control signal; when the PWM control circuit is cut off, the output module (5) is communicated with the coupling module (4), so that the output module (5) outputs the high level of the PWM control signal.
2. A PWM driving control circuit according to claim 1, wherein the dc converting module (3) comprises a first resistor R1, a first capacitor C1 and a first transistor Q1, a base of the first transistor Q1 is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to one end of a first capacitor C1, a common connection end of the first resistor R1 and the first capacitor C1 is connected to the high-pass filtering module (2) as an input end of the dc converting module (3), the other end of the first capacitor C1 is connected to an emitter of a first transistor Q1 and grounded, and a collector of the first transistor Q1 is electrically connected to an input end of the coupling module (4) and an input end of the output module (5) as an output end of the dc converting module (3).
3. The PWM driving control circuit according to claim 2, wherein the first transistor Q1 is an NPN transistor.
4. The PWM driving control circuit according to claim 1, wherein the coupling module (4) comprises a second resistor R2 and a power supply VCC, one end of the second resistor R2 is connected to the output end of the DC conversion module (3) and the input end of the output module (5) as the input end of the coupling module (4), and the other end is connected to the power supply VCC.
5. The PWM driving control circuit according to claim 4, wherein said output module (5) comprises a second capacitor C2, a third resistor R3 and an output terminal, one end of said second capacitor C2 is connected to said second resistor R2, a common connection terminal between said second capacitor C2 and said second resistor R2 is connected to said output terminal of said DC conversion module (3) and said input terminal of said coupling module (4) as said input terminal of said output module (5), another end of said second capacitor C2 is connected to one end of said third resistor R3, and another end of said third resistor R3 is used as said output terminal of said output module (5) to output a signal.
6. A PWM drive control circuit according to any of claims 1-5 characterized in that said high pass filter module (2) is a high pass filter.
7. A PWM drive control circuit according to claim 6, characterized in that said high pass filter comprises a third capacitor C3 and a fourth resistor R4, one end of said third capacitor C3 is connected to the output terminal of said input module (1) as the input terminal of said high pass filter, the other end of said third capacitor C3 is connected to ground through a fourth resistor R4, and the other end of said third capacitor C3 is connected to the output terminal of said high pass filter and the input terminal of said DC conversion module (3).
8. The PWM drive control circuit according to claim 7, wherein the frequency of the high-frequency PWM signal satisfies a condition: f. ofH≥2fc；
Wherein f isHAt a high frequency of saidFrequency of PWM signal, fcIs the cut-off frequency of the high-pass filter.
9. The PWM drive control circuit according to claim 8, wherein the frequency of the PWM signal of the low frequency satisfies a condition: f. ofL≤fc/2；
Wherein f isLThe frequency of the PWM signal being a low frequency.
10. A PWM drive control circuit according to claim 1, characterized in that the input module (1) is controlled by a MCU.
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|---|---|---|---|
| CN202022281645.0U CN213783267U (en) | 2020-10-14 | 2020-10-14 | PWM drive control circuit |
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| CN202022281645.0U CN213783267U (en) | 2020-10-14 | 2020-10-14 | PWM drive control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890426A (en) * | 2021-09-09 | 2022-01-04 | 上海恒灼科技有限公司 | Intelligent IPM module and operation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113890426A (en) * | 2021-09-09 | 2022-01-04 | 上海恒灼科技有限公司 | Intelligent IPM module and operation method thereof |
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