CN203827180U - Voltage stabilization feedback circuit for automotive frequency converter power supply - Google Patents
Voltage stabilization feedback circuit for automotive frequency converter power supply Download PDFInfo
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- CN203827180U CN203827180U CN201420205332.9U CN201420205332U CN203827180U CN 203827180 U CN203827180 U CN 203827180U CN 201420205332 U CN201420205332 U CN 201420205332U CN 203827180 U CN203827180 U CN 203827180U
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- pwm controller
- frequency converter
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Abstract
The utility model provides a voltage stabilization feedback circuit for an automotive frequency converter power supply. The voltage stabilization feedback circuit comprises a current mode PWM controller, an isolation optocoupler, a controllable shunt benchmark, a first resistor, a second resistor and a third resistor; one end of the second resistor is connected via the first resistor to a working power supply of a frequency converter main control board, and the other end is grounded; nodes between the first resistor and the second resistor are connected to a reference end of the controllable shunt benchmark, the anode of the controllable shunt benchmark is grounded, and the cathode is connected to the cathode of the isolation optocoupler; the anode of the isolation optocoupler is connected via the third resistor to the working power supply of the frequency converter main control board, the emitter is grounded and the collector is connected respectively to a voltage feedback end and a comparison end of the current mode PWM controller; and an output end of the current mode PWM controller is connected to a power switch tube. The voltage stabilization feedback circuit for the automotive frequency converter power supply is simple in structure, high in reliability, high in practicality and fast in dynamic response of power supply.
Description
Technical field
The utility model relates to vehicle frequency transformer power technique fields, specifically a kind of vehicle frequency transformer power supply voltage stabilizing feedback circuit.
Background technology
No matter be pure electric automobile, mixed power electric car or fuel cell electric vehicle, vehicle electric drive system is key technology and common technology.Vehicle frequency transformer is one of kernel component of motor in electric automobile control, and the reliability of vehicle frequency transformer is directly connected to the vehicle security of electric automobile.The frequency converter of electric automobile assembling in the market is mostly expanded and is come from industrial frequency transformer, electronic devices and components in industrial frequency transformer adopt technical grade chip, instead of automotive grade chip, be difficult to meet the electromagnetic compatibility (EMC) of electric automobile under limiting condition and the demand of electromagnetic interference (EMI).Therefore, design a kind of reliable and stable vehicle frequency transformer power supply voltage stabilizing feedback circuit, to developing the vehicle frequency transformer of high-quality, and even the progress of promotion electric vehicle engineering all will play an important role.
Utility model content
The purpose of this utility model is to provide a kind of simple in structure, reliability is high, practical, power supply dynamic response is fast vehicle frequency transformer power supply voltage stabilizing feedback circuit.
The technical solution of the utility model is:
A kind of vehicle frequency transformer power supply voltage stabilizing feedback circuit, this circuit comprises loop Current-type PWM Controller, isolation optocoupler, controlled shunting benchmark, the first resistance, the second resistance and the 3rd resistance, described loop Current-type PWM Controller is selected TL2844B cake core, described isolation optocoupler is selected PC817 cake core, and described controlled shunting benchmark is selected TL431 cake core; One end of described the second resistance is connected to the working power of frequency converter master control borad, other end ground connection by the first resistance; Node between described the first resistance and the second resistance is connected to the reference edge of controlled shunting benchmark, the plus earth of described controlled shunting benchmark, and its negative electrode is connected with the negative electrode of isolation optocoupler; The anode of described isolation optocoupler is connected to the working power of frequency converter master control borad by the 3rd resistance, its grounded emitter, its collector electrode respectively with the pressure feedback port of loop Current-type PWM Controller and relatively end be connected; The output of described loop Current-type PWM Controller is connected to power switch pipe.
Described vehicle frequency transformer power supply voltage stabilizing feedback circuit, is provided with the first filter circuit between described the first resistance and the negative electrode of controlled shunting benchmark, and described the first filter circuit is made up of the first electric capacity.
Described vehicle frequency transformer power supply voltage stabilizing feedback circuit, between the collector electrode of described isolation optocoupler and the pressure feedback port of loop Current-type PWM Controller, be provided with the second filter circuit, described the second filter circuit is made up of the second electric capacity, electric three electric capacity and the 4th resistance, described the second electric capacity after connecting with the 4th resistance again with the 3rd Capacitance parallel connection.
The utlity model has that circuit structure is simple, reliability is high, the advantage such as practical and power supply dynamic response is fast.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Further illustrate the utility model below in conjunction with accompanying drawing and concrete case study on implementation.
As shown in Figure 1, a kind of vehicle frequency transformer power supply voltage stabilizing feedback circuit, comprises loop Current-type PWM Controller TL2844B, isolation optocoupler PC817, controlled shunting benchmark TL431, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3.One end of the second resistance R 2 is connected to the working power 3 of frequency converter master control borad, other end ground connection by the first resistance R 1.Node between the first resistance R 1 and the second resistance R 2 is connected to the reference edge of controlled shunting benchmark TL431.The plus earth of controlled shunting benchmark TL431, the negative electrode of controlled shunting benchmark TL431 is connected with the negative electrode of isolation optocoupler PC817.The anode of isolation optocoupler PC817 is connected to the working power 3 of frequency converter master control borad by the 3rd resistance R 3, the grounded emitter of isolation optocoupler PC817, the collector electrode of isolation optocoupler PC817 is respectively with the pressure feedback port of loop Current-type PWM Controller TL2844B with relatively hold and be connected.The output of loop Current-type PWM Controller TL2844B is connected to power switch pipe 4.The first filter circuit 1 being made up of the first capacitor C 1 is connected between the first resistance R 1 and the negative electrode of controlled shunting benchmark TL431.After being connected with the 4th resistance R 4 by the second capacitor C 2, second filter circuit 2 that form in parallel with the 3rd capacitor C 3 is connected between the collector electrode and the pressure feedback port of loop Current-type PWM Controller TL2844B of isolation optocoupler PC817 again.
Operation principle of the present utility model:
The utility model utilizes controlled shunting benchmark TL431 to form feedback compensation circuit, the output voltage of the working power 3 of frequency converter master control borad is inputted the reference edge of controlled shunting benchmark TL431 after the first resistance R 1 and the second resistance R 2 dividing potential drops, to control the electric current that flows through controlled shunting benchmark TL431.Loop Current-type PWM Controller TL2844B is arranged in the primary circuit of high frequency transformer 5, the switch of power ratio control switching tube 4, in the secondary circuit of high frequency transformer 5, controlled shunting benchmark TL431 is as benchmark and feedback error amplifier, and corresponding error voltage is exported and produced in sampling.This error voltage is transformed into error current by optocoupler PC817, is coupled in the primary circuit of high frequency transformer 5, as the input of loop Current-type PWM Controller TL2844B.Loop Current-type PWM Controller TL2844B, by this input, the turn-on and turn-off time that produces corresponding duty cycle signals and carry out power ratio control switching tube 4, to control the on off operating mode of high frequency transformer 5, realizes the object of stable output.
Such as, in the time causing that due to the change in voltage of batteries of electric automobile 6 output voltage of the working power 3 of frequency converter master control borad has rising trend, the reference voltage terminal of inputting controlled shunting benchmark TL431 increases, cause the electric current that flows through controlled shunting benchmark TL431 to increase, the luminous enhancing of isolation optocoupler PC817, the feedback voltage that its collector electrode obtains increases, the feedback voltage that loop Current-type PWM Controller TL2844B reception raises can correspondingly reduce to export the duty ratio of PWM waveform, and the time of power switch pipe 4 conductings is shortened, otherwise, in the time causing that due to the change in voltage of batteries of electric automobile 6 output voltage of the working power 3 of frequency converter master control borad has reduction trend, the reference voltage terminal of inputting controlled shunting benchmark TL431 decreases, cause the electric current that flows through controlled shunting benchmark TL431 to reduce, isolation optocoupler PC817 luminescent decay, the feedback voltage that its collector electrode obtains decreases, loop Current-type PWM Controller TL2844B receives the feedback voltage reducing can correspondingly increase the duty ratio of exporting PWM waveform, make the time of power switch pipe 4 conductings elongated, thereby the output voltage that maintains the working power 3 of frequency converter master control borad is a steady state value.
The utility model is directly received isolation optocoupler PC817 collector electrode the relatively end of loop Current-type PWM Controller TL2844B, skip over the error amplifier of loop Current-type PWM Controller TL2844B inside, shorten the transmission time of feedback voltage signal, made power supply dynamic response faster.
The above execution mode is only that preferred implementation of the present utility model is described; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skill in the art make the technical solution of the utility model, all should fall in the definite protection range of claims of the present utility model.
Claims (3)
1. a vehicle frequency transformer power supply voltage stabilizing feedback circuit, it is characterized in that: this circuit comprises loop Current-type PWM Controller, isolation optocoupler, controlled shunting benchmark, the first resistance, the second resistance and the 3rd resistance, described loop Current-type PWM Controller is selected TL2844B cake core, described isolation optocoupler is selected PC817 cake core, and described controlled shunting benchmark is selected TL431 cake core; One end of described the second resistance is connected to the working power of frequency converter master control borad, other end ground connection by the first resistance; Node between described the first resistance and the second resistance is connected to the reference edge of controlled shunting benchmark, the plus earth of described controlled shunting benchmark, and its negative electrode is connected with the negative electrode of isolation optocoupler; The anode of described isolation optocoupler is connected to the working power of frequency converter master control borad by the 3rd resistance, its grounded emitter, its collector electrode respectively with the pressure feedback port of loop Current-type PWM Controller and relatively end be connected; The output of described loop Current-type PWM Controller is connected to power switch pipe.
2. vehicle frequency transformer power supply voltage stabilizing feedback circuit according to claim 1, is characterized in that: between described the first resistance and the negative electrode of controlled shunting benchmark, be provided with the first filter circuit, described the first filter circuit is made up of the first electric capacity.
3. vehicle frequency transformer power supply voltage stabilizing feedback circuit according to claim 1, it is characterized in that: between the collector electrode of described isolation optocoupler and the pressure feedback port of loop Current-type PWM Controller, be provided with the second filter circuit, described the second filter circuit is made up of the second electric capacity, electric three electric capacity and the 4th resistance, described the second electric capacity after connecting with the 4th resistance again with the 3rd Capacitance parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420205332.9U CN203827180U (en) | 2014-04-25 | 2014-04-25 | Voltage stabilization feedback circuit for automotive frequency converter power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420205332.9U CN203827180U (en) | 2014-04-25 | 2014-04-25 | Voltage stabilization feedback circuit for automotive frequency converter power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203827180U true CN203827180U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420205332.9U Expired - Fee Related CN203827180U (en) | 2014-04-25 | 2014-04-25 | Voltage stabilization feedback circuit for automotive frequency converter power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203827180U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262334A (en) * | 2015-11-13 | 2016-01-20 | 安徽巨一自动化装备有限公司 | Trigger determination circuit applied to intelligent precision voltage stabilization chip of vehicle-mounted direct-current converter |
-
2014
- 2014-04-25 CN CN201420205332.9U patent/CN203827180U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262334A (en) * | 2015-11-13 | 2016-01-20 | 安徽巨一自动化装备有限公司 | Trigger determination circuit applied to intelligent precision voltage stabilization chip of vehicle-mounted direct-current converter |
| CN105262334B (en) * | 2015-11-13 | 2017-08-25 | 安徽巨一自动化装备有限公司 | A kind of triggering decision circuitry for Vehicular direct-current converter intelligent Precision voltage stabilizing chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20170425 |