CN210986065U - PWM signal shaping circuit and electric vehicle controller - Google Patents
PWM signal shaping circuit and electric vehicle controller Download PDFInfo
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- CN210986065U CN210986065U CN201921835162.1U CN201921835162U CN210986065U CN 210986065 U CN210986065 U CN 210986065U CN 201921835162 U CN201921835162 U CN 201921835162U CN 210986065 U CN210986065 U CN 210986065U
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Abstract
The utility model provides a PWM signal shaping circuit and electric vehicle controller, including control chip, one-level filter circuit, signal amplification circuit, second grade filter circuit and output circuit, control chip is including the PWM module, the PWM module is connected one-level filter circuit's input, one-level filter circuit's output is connected signal amplification circuit's input, signal amplification circuit's output is connected second grade filter circuit's input, second grade filter circuit's output is connected output circuit's input. Clutter in the filter circuit filters the circuit, enlargies the PWM signal through signal amplification circuit, carries out voltage through output circuit and follows, improves PWM signal output's accuracy, makes the controller realize more accurate control to the electric motor car, has promoted the reliability and the security of electric motor car greatly.
Description
Technical Field
The utility model relates to an electronic circuit technical field, concretely relates to PWM signal shaping circuit and electric vehicle controller.
Background
The electric bus has good power performance, continuous driving mileage of about 500 kilometers, long service life of a battery (generally two to four years), low cost and good matching with the whole bus, and completely meets various requirements of road traffic and safety regulations and requirements of passenger transportation. The electric motor coach is a national 863 plan and a 'twelve-five' plan which clearly puts forward the requirements of supporting the new energy automobile industry and seizing the technical high point of the electric automobile industry, and promotes the domestic electric automobile industry to enter industrialization and large-scale popularization and application.
The whole electric bus controller is used as a core control module of the electric bus, the controller often controls each module of the electric bus through a Pulse Width Modulation (PWM) technology, but a PWM signal output by the existing controller has a small PWM signal shape voltage, and each receiving module needs to be added with a signal amplifying circuit; and the inaccurate PWM signal still receives the problem of the interference of various electromagnetic noise easily, leads to the PWM signal control signal that each module of bus received to be inaccurate, influences electric bus's reliability and security.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to avoid the weak point among the prior art and provide a PWM signal shaping circuit and electric vehicle controller, electric vehicle controller passes through PWM signal shaping circuit output enlarged, accurate PWM signal.
The purpose of the utility model is realized through the following technical scheme:
in a first aspect, the utility model provides a PWM signal shaping circuit, including control chip, one-level filter circuit, signal amplification circuit, second grade filter circuit and output circuit, control chip is including the PWM module, the PWM module is connected one-level filter circuit's input, one-level filter circuit's output is connected signal amplification circuit's input, signal amplification circuit's output is connected second grade filter circuit's input, second grade filter circuit's output is connected output circuit's input.
Preferably, the control chip is one of MCU, ARM, DSP, FPGA, SoC and CPU.
Preferably, the primary filter circuit comprises a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is connected with one end of the resistor R1, the common end of the capacitor C1 is connected with the PWM module, the other end of the capacitor C1 is connected with the other end of the resistor R1, the common end of the capacitor C3683 is connected with one end of the resistor R2 and the input end of the signal amplification circuit, and the other end of the resistor R2 is grounded.
Preferably, the signal amplifying circuit comprises a conducting switch Q1, a resistor R3 and a power supply V1, a control electrode of the conducting switch is connected to the output end of the primary filter circuit, an output electrode of the conducting switch Q1 is grounded, an input electrode of the conducting switch Q1 is connected to one end of the resistor R3, a common end of the resistor R1 is connected to the input end of the secondary filter circuit, and the other end of the resistor R3 is connected to the power supply V1.
Preferably, the conducting switch Q1 is one of a triode, a MOS transistor, and an IGBT.
Preferably, the secondary filter circuit includes a resistor R4, a resistor R5, a capacitor C2 and a capacitor C3, one end of the resistor R4 is connected to the output end of the signal amplification circuit, the other end of the resistor R4 is connected to one end of the resistor R5 and a common end of the resistor R5 is connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R5 is connected to one end of the capacitor C3 and a common end of the capacitor R3 is connected to the input end of the output circuit, and the other end of the capacitor C3 is grounded.
Preferably, the output circuit outputs the PWM signal after voltage following through the operational amplifier U2 or the voltage following chip U3.
Based on above technical scheme, the utility model discloses a first preferred embodiment, when output circuit passes through operational amplifier U2 output PWM signal, output circuit includes operational amplifier U2 and resistance R6, operational amplifier U2's non inverting input end is connected second grade filter circuit's output, operational amplifier U2's inverting input end is connected operational amplifier U2's output and common port are connected resistance R6's one end and output PWM signal, resistance R6's other end ground connection.
In a second preferred embodiment of the present invention, when the output circuit outputs the PWM signal through the voltage follower chip U3, the output circuit includes a voltage follower chip U3, a resistor R7, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7 and a power supply V2, one end of the resistor R7 is connected to the output end of the secondary filter circuit and the common end is connected to one end of the capacitor C4 and the signal input end of the voltage follower chip U3, the other end of the resistor R7 is grounded, the other end of the capacitor C4 is grounded, the power supply input end of the voltage follower chip U3 is connected to the power supply V2 and the common end is connected to one end of the capacitor C7, the other end of the capacitor C7 is grounded, the first output end of the voltage follower chip U3 is grounded, the signal output end of the voltage follower chip U3 is connected to one end of the capacitor C5 and the common end is connected to one end of the capacitor C6, the other end of the capacitor C5 is grounded, and the other end of the capacitor C6 is grounded.
In a second aspect, the present invention further provides an electric vehicle controller, which includes the PWM signal shaping circuit of the first aspect.
According to the above technical scheme, the utility model discloses following beneficial effect has: the utility model provides a PWM signal shaping circuit and electric vehicle controller, through the clutter in the filter circuit filtering circuit, enlarge the PWM signal through signal amplification circuit, carry out voltage through output circuit and follow, improve the accuracy of PWM signal output, make the controller realize more accurate control to the electric motor car, promoted the reliability and the security of electric motor car greatly.
Drawings
The invention is further described with the aid of the accompanying drawings, in which, however, the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived from the following drawings without inventive effort.
Fig. 1 is a schematic circuit diagram of a PWM signal shaping circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a PWM signal shaping circuit according to another embodiment of the present invention.
Wherein the reference numbers are as follows: 10. the circuit comprises a first-stage filter circuit, a signal amplifying circuit, a second-stage filter circuit and an output circuit, wherein the first-stage filter circuit comprises 20 signal amplifying circuits, 30 second-stage filter circuits and 40 output circuits.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
As shown in fig. 1, the PWM signal shaping circuit of this embodiment includes a control chip U1, a first-stage filter circuit 10, a signal amplifier circuit 20, a second-stage filter circuit 30, and an output circuit 40, where the control chip U1 includes a PWM module, the PWM module is connected to an input terminal of the first-stage filter circuit 10, an output terminal of the first-stage filter circuit 10 is connected to an input terminal of the signal amplifier circuit 20, an output terminal of the signal amplifier circuit 20 is connected to an input terminal of the second-stage filter circuit 30, and an output terminal of the second-stage filter circuit 30 is connected to an input terminal of the output circuit 40.
The control chip U1 outputs PWM signals through the PWM module, the PWM signals are filtered through the first-stage filter circuit 10, the signal amplification circuit 20 amplifies the filtered PWM signals, the amplified PWM signals are filtered again through the second-stage filter circuit 30 and then are output to each controlled module through the output circuit 40, the PWM signals are output after being amplified through multi-stage filtering, and the intensity and the accuracy of the PWM signals are improved.
The control chip U1 may be any chip that can realize a control function by outputting a PWM signal, such as MCU, ARM, DSP, FPGA, SoC, and CPU, and in this embodiment, MCU is selected as the control chip U1 for description.
The first-stage filter circuit 10 comprises a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is connected with one end of the resistor R1, the common end of the capacitor C1 is connected with the PWM module, the other end of the capacitor C1 is connected with the other end of the resistor R1, the common end of the capacitor C3684 is connected with one end of the resistor R2 and the input end of the signal amplifying circuit 20, and the other end of the resistor R2 is grounded.
The capacitor C1 is used for filtering the PWM signal output by the PWM module, the resistor R1 is used for limiting current, so that the signal amplification circuit 20 is prevented from being impacted by the signal with overlarge output voltage of the PWM module, the resistor R2 is a pull-down resistor, the pull-down resistor R2 is used for clamping an uncertain signal at a low level through a resistor, and the pull-down resistor R2 plays a role in limiting current at the same time.
The signal amplifying circuit 20 comprises a conducting switch Q1, a resistor R3 and a power supply V1, wherein a control electrode of the conducting switch is connected with an output end of the primary filter circuit 10, an output electrode of the conducting switch Q1 is grounded, an input electrode of the conducting switch Q1 is connected with one end of a resistor R3, a common end of the resistor R1 is connected with an input end of the secondary filter circuit 30, and the other end of the resistor R3 is connected with the power supply V1.
The on switch Q1 is any element having a switching function, such as a transistor, a MOS transistor, an IGBT, a relay, etc., and the NPN transistor is exemplified in the present embodiment.
The base of the triode Q1 is connected with the output end of the first-stage filter circuit 10, and the PWM signal output by the MCU is output to the base of the triode Q1 because the PWM signal is not changed by the filter circuit. When the PWM signal is at a high level, the triode Q1 is conducted; when the PWM signal is low, transistor Q1 is turned off. When the transistor Q1 is turned on, the signal amplifying circuit 20 outputs a low level to the second-stage filter circuit 30; when the transistor Q1 is turned off, the signal amplification circuit 20 outputs a signal having the same voltage as the power supply V1 through the pull-up resistor R3. By selecting the power supply V1 with different voltages, the high-low voltage of the amplified PWM signal is equal to the voltage of the power supply V1. After the PWM signal passes through the signal amplification circuit 20, the PWM signal is inverted and amplified.
The second-stage filter circuit 30 includes a resistor R4, a resistor R5, a capacitor C2, and a capacitor C3, one end of the resistor R4 is connected to the output end of the signal amplifying circuit 20, the other end of the resistor R4 is connected to one end of the resistor R5 and the common end is connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R5 is connected to one end of the capacitor C3 and the common end is connected to the input end of the output circuit 40, and the other end of the capacitor C3 is grounded.
R4 and C2 in the secondary filter circuit 30 form RC filter, R5 and C3 form RC filter; through two-stage RC filtering, the amplified and inverted PWM signal UI is more accurate.
The output circuit 40 outputs a PWM output signal UO through an operational amplifier U2, the output circuit 40 comprises an operational amplifier U2 and a resistor R6, the non-inverting input end of the operational amplifier U2 is connected with the output end of the secondary filter circuit 30, the inverting input end of the operational amplifier U2 is connected with the output end of the operational amplifier U2, the common end of the operational amplifier U2 is connected with one end of a resistor R6 and outputs the PWM signal, and the other end of the resistor R6 is grounded.
The operational amplifier U2 serves as a voltage follower in this embodiment. The secondary filter circuit 30 outputs a voltage UI to the non-inverting input terminal of the voltage follower, and outputs a PWM output signal UO identical to UI at the output terminal of the voltage follower. When UI is low, the output circuit 40 outputs a low-level signal UO through the pull-down resistor R6; when UI is high, the output circuit 40 outputs a high level signal UO. The integrated operational amplifier U2 has the advantages of high input resistance, high open-loop amplification factor, less zero drift, small size, reliable performance and the like when used as a voltage follower, and the output of the operational amplifier U2 ensures that the PWM signal output by the PWM signal shaping circuit is more accurate.
The working principle of the embodiment is as follows: when the MCU outputs a high level, the transistor Q1 is turned on, the resistor R3 is grounded, the output voltage of the signal amplification circuit 20 is a low level, and the output signal UI of the secondary filter circuit 30 is a low level; when the MCU outputs a low level, the transistor Q1 is turned off, the resistor R3 is not grounded, the output voltage of the signal amplifying circuit 20 is at a high level, and the output signal UI of the secondary filter circuit 30 is at a high level. The operational amplifier U2 is characterized as a voltage follower in that UO is UI, so when the control chip U1 outputs high level, the PWM output signal UO is low level; when the control chip U1 outputs a low level, the PWM output signal UO is at a high level.
Embodiment 2, a PWM signal shaping circuit.
As shown in fig. 2, the present embodiment is different from embodiment 1 in that the output circuit 40 outputs the PWM output signal through the voltage follower chip U3, the output circuit 40 includes a voltage follower chip U3, a resistor R7, a capacitor C4, capacitor C5, capacitor C6, capacitor C7 and power V2, the output of secondary filter circuit 30 is connected to the one end of resistance R7 and the signal input of common port connection capacitor C4's one end and voltage follow chip U3, the other end ground of resistance R7, the other end ground of capacitor C4, power V2 is connected to the power input of voltage follow chip U3 and the one end of common port connection capacitor C7, the other end ground of capacitor C7, the first output ground of voltage follow chip U3, the one end and the common port connection capacitor C6's one end of voltage follow chip U3's signal output terminal capacitor C5, the other end ground of capacitor C5, the other end ground of capacitor C6.
The difference from embodiment 1 is that the output circuit 40 in embodiment 1 is only used for voltage follower, the output circuit 40 in this embodiment is further provided with an input end pull-down resistor R7 to make the signal input by the signal input end of the voltage follower chip U3 more stable, a capacitor C4 is further provided to filter the input PWM signal, a capacitor C7 filters the supply voltage of the voltage follower chip U3, a capacitor C5 and a capacitor C6 filter the PWM output signal, and the multi-stage filtering makes the PWM output signal more stable.
Embodiment 3, an electric vehicle controller.
The embodiment provides an electric vehicle controller, the controller includes the PWM signal shaping circuit of embodiment 1 or embodiment 2, through the PWM signal shaping circuit makes the controller realize more accurate control to the electric vehicle, has promoted the reliability and the security of electric vehicle greatly.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A PWM signal shaping circuit is characterized by comprising a control chip, a primary filter circuit, a signal amplification circuit, a secondary filter circuit and an output circuit, wherein the control chip comprises a PWM module, the PWM module is connected with the input end of the primary filter circuit, the output end of the primary filter circuit is connected with the input end of the signal amplification circuit, the output end of the signal amplification circuit is connected with the input end of the secondary filter circuit, and the output end of the secondary filter circuit is connected with the input end of the output circuit.
2. The PWM signal shaping circuit according to claim 1, characterized in that: the control chip is one of MCU, ARM, DSP, FPGA, SoC and CPU.
3. The PWM signal shaping circuit according to claim 1, characterized in that: the primary filter circuit comprises a capacitor C1, a resistor R1 and a resistor R2, one end of the capacitor C1 is connected with one end of the resistor R1 and a common end of the resistor R1 are connected with the PWM module, the other end of the capacitor C1 is connected with the other end of the resistor R1 and the common end of the resistor R2 and the input end of the signal amplifying circuit, and the other end of the resistor R2 is grounded.
4. The PWM signal shaping circuit according to claim 1, characterized in that: the signal amplification circuit includes switch Q1, resistance R3 and power V1, the control pole that switches on the switch connects one-level filter circuit's output, switch Q1's output pole ground connection switches on, switch Q1's input pole connection resistance R3's one end and common port are connected two-level filter circuit's input, resistance R3's the other end is connected power V1.
5. The PWM signal shaping circuit according to claim 4, characterized in that: the conducting switch Q1 is one of a triode, an MOS tube and an IGBT.
6. The PWM signal shaping circuit according to claim 1, characterized in that: the secondary filter circuit comprises a resistor R4, a resistor R5, a capacitor C2 and a capacitor C3, one end of the resistor R4 is connected with the output end of the signal amplification circuit, the other end of the resistor R4 is connected with one end of the resistor R5 and the common end of the resistor R2, the other end of the capacitor C2 is grounded, the other end of the resistor R5 is connected with one end of the capacitor C3 and the common end of the capacitor C3, the input end of the output circuit is connected with the other end of the capacitor C3, and the other end of the capacitor C3 is grounded.
7. The PWM signal shaping circuit according to claim 1, characterized in that: the output circuit outputs PWM signals after voltage following through an operational amplifier U2 or a voltage following chip U3.
8. The PWM signal shaping circuit according to claim 7, characterized in that: when the output circuit outputs the PWM signal through the operational amplifier U2, the output circuit comprises an operational amplifier U2 and a resistor R6, the non-inverting input end of the operational amplifier U2 is connected with the output end of the secondary filter circuit, the inverting input end of the operational amplifier U2 is connected with the output end of the operational amplifier U2 and the public end of the operational amplifier U2 is connected with one end of the resistor R6 and outputs the PWM signal, and the other end of the resistor R6 is grounded.
9. The PWM signal shaping circuit according to claim 7, characterized in that: when the output circuit outputs the PWM signal through the voltage follower chip U3, the output circuit comprises a voltage follower chip U3, a resistor R7, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7 and a power supply V2, one end of the resistor R7 is connected with the output end of the secondary filter circuit, and the common end is connected with one end of the capacitor C4 and the signal input end of the voltage follower chip U3, the other end of the resistor R7 is grounded, the other end of the capacitor C4 is grounded, the power supply input end of the voltage follower chip U3 is connected with the power supply V2, and the common end of the voltage follower chip U3 is connected with one end of the capacitor C7, the other end of the capacitor C7 is grounded, the first output end of the voltage following chip U3 is grounded, the signal output end of the voltage following chip U3 is connected with one end of the capacitor C5, the common end of the voltage following chip U3 is connected with one end of the capacitor C6, the other end of the capacitor C5 is grounded, and the other end of the capacitor C6 is grounded.
10. An electric vehicle controller characterized by: the electric vehicle controller comprises the PWM signal shaping circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921835162.1U CN210986065U (en) | 2019-10-29 | 2019-10-29 | PWM signal shaping circuit and electric vehicle controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921835162.1U CN210986065U (en) | 2019-10-29 | 2019-10-29 | PWM signal shaping circuit and electric vehicle controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210986065U true CN210986065U (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921835162.1U Expired - Fee Related CN210986065U (en) | 2019-10-29 | 2019-10-29 | PWM signal shaping circuit and electric vehicle controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210986065U (en) |
-
2019
- 2019-10-29 CN CN201921835162.1U patent/CN210986065U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200710 |
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| CF01 | Termination of patent right due to non-payment of annual fee |