CN202737516U - PI control circuit in direct current charging device - Google Patents
PI control circuit in direct current charging device Download PDFInfo
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- CN202737516U CN202737516U CN 201220372861 CN201220372861U CN202737516U CN 202737516 U CN202737516 U CN 202737516U CN 201220372861 CN201220372861 CN 201220372861 CN 201220372861 U CN201220372861 U CN 201220372861U CN 202737516 U CN202737516 U CN 202737516U
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- control circuit
- voltage
- charging device
- operational amplifier
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Abstract
The utility model discloses a PI control circuit in a direct current charging device. The PI control circuit comprises a voltage control circuit for outputting a regulation voltage VOSC and a current control circuit for supplying and adjusting the regulation voltage VOSC. The voltage control circuit and the current control circuit both internally comprise PI circuits. The comparison operation of acquired output voltage, magnitude of current, preset quantity, etc., is processed by the PI circuits in the voltage control circuit and the current control circuit. According to the PI control circuit, the voltage and current double closed loop control of the direct current charging device is realized; the disadvantage that the current is easy to lose control when the direct current charging device is under single voltage control; and the performances are reliable and the circuit is simple.
Description
Technical field
The utility model relates to the control circuit in a kind of dc charging device, belongs to charging device control technology field in the direct current system.
Background technology
Direct current system is the important component part in the electric power places such as transformer station or power plant, mainly partly is comprised of batteries, dc charging device and direct-current supervision etc.Its effect is: under normal circumstances, and for combined floodgate load and control load in transformer station and the power plant provide DC power supply; During fault, the station-service machinery that drags for relaying protection and automatics, combined floodgate and circuit breaker trip, carrier communication, emergency lighting, DC motor in the situation that electricity consumption in transformer station and the power plant is interrupted provides working dc power.So whether normal to storage battery operation charge maintenance, directly affect the operation of reliability, fail safe and the accurate stable of various device in the application.If the phenomenons such as overcharging appears in battery pack in the dc charging device, overdischarge and cell degradation can cause battery to damage or battery capacity sharply descends, make the output voltage electric current that dc charging device can not be correct.
Dc charging device develops into present high frequency switch type DC Module from traditional linear power supply, especially the development of large scale integrated circuit technology since the seventies, make Switching Power Supply that qualitative leap arranged, make high frequency switch type DC charging module have that efficient is high, volume is little and the outstanding advantages such as lightweight.
The internal work principle of dc charging device is: three-phase alternating-current supply is input to rectification circuit through electromagnetic interface filter, with the direct current output of AC rectification for pulsation, by PPFC (Passive Power Factor Correction) (PFC) circuit, the direct current of pulsation is converted to straight DC power supply, the DC/DC high-frequency inverter is converted to high-frequency ac power with direct current, the DC of high frequency is converted to the direct current of dither by high-frequency rectification circuit, this direct current is exported by High frequency filter.DC/DC high frequency conversion circuit wherein is under the control of control circuit, to realize voltage adjustment (comprise voltage stabilizing and voltage adjust).
Adopt the voltage-controlled type Switching Power Supply can be out of control to switching current, be not easy to overcurrent protection, and low-response, poor stability.
Non-PI control circuit is generally adopted in charging device Closed loop Control field in the direct current system at present, and electric current is easily out of control during the control of dc charging device univoltage, and charging device meeting overcurrent and output voltage are unstable under the extreme case.
The utility model content
The utility model purpose provides the control circuit of the PI in a kind of dc charging device, based on voltage, the current double closed-loop control system control circuit of PI control circuit, is used for the closed-loop control of direct current system charging device.
For solving the problems of the technologies described above, the utility model provides the control circuit of the PI in a kind of dc charging device.
The PI controller is a kind of linear controller, and it consists of control deviation according to set-point and real output value, and the ratio (P) of deviation and integration (I) by linear combination formation controlled quentity controlled variable, are controlled controlled device.The effect of each correction link of PI controller is as follows:
1. proportional component
Controller produces control action immediately, to reduce deviation.Usually along with the increasing of proportionality coefficient value, the overshoot of closed-loop system strengthens, and system response time is accelerated, and is increased to a certain degree but work as the proportionality coefficient value, and it is unstable that system can become.
2. integral element
Be mainly used in eliminating static difference, improve system without margin.The power of integral action depends on integration time constant, and time constant is larger, and integral action is more weak, otherwise stronger.Usually in the situation that the proportionality coefficient value is constant, integration time constant is larger, and namely integral action is more weak, and the overshoot of closed-loop system is less, and the response speed of system is slack-off.
Proportional control can realize the quick response to deviation, and integral control can be eliminated static difference.Ratio and integral control are combined the response that can accelerate deviation when eliminating static difference.
PI control circuit in the dc charging device that the utility model provides, it is characterized in that, comprise an output and adjust the current control circuit that the voltage control circuit and of voltage VOSC replenishes the described adjustment voltage VOSC of adjusting, all comprise a PI circuit in described voltage control circuit and the current control circuit; Described PI circuit comprises an error operational amplifier, be parallel to a resistance and the electric capacity of connecting between error operational amplifier reverse input end and the output;
In the described voltage control circuit, the output voltage sampled value VFB of dc charging device is connected to error operational amplifier reverse input end in the PI circuit in it through resistance R 63, R44, reference voltage value VREF, parallel operation current equalizing bus bar magnitude of voltage VJL, the outside set-point VADJ through regulating all input this error operational amplifier normal phase input end, and this error operational amplifier output terminal is used for exporting described adjustment voltage VOSC;
In the described current control circuit, output current sampled value IS-, the reference voltage value VREF of dc charging device all is connected to the error operational amplifier normal phase input end in its interior PI circuit; The output current limit value IADJ of dc charging device is through regulating this error operational amplifier inverting input of input, and this error operational amplifier output terminal links to each other through the adjustment voltage VOSC of a diode with described voltage control circuit output.
Described outside set-point VADJ obtains a given magnitude of voltage by the divider resistance dividing potential drop, inputs the error operational amplifier normal phase input end in the described voltage control circuit.
Error operational amplifier output terminal in the described voltage control circuit is connected to signal generator through an output resistance, adjusts voltage VOSC to signal generator output.
The output current sampled value IS-of dc charging device and reference voltage value VREF are connected to error operational amplifier normal phase input end in the described current control circuit by another resistance respectively.
The output current limit value IADJ of dc charging device obtains another given magnitude of voltage through another divider resistance dividing potential drop, inputs the error operational amplifier inverting input in the described current control circuit.
Error operational amplifier output terminal in the described current control circuit is connected with described diode cathode, and described diode cathode is connected to adjusts voltage VOSC.
The beneficial effect that the utility model reaches:
PI control circuit in the dc charging device of the present utility model, voltage, the current double closed-loop control of dc charging device have been realized by the PI control circuit, overcome easily shortcoming out of control of dc charging device univoltage when control electric current, and dependable performance, circuit are simple.
Description of drawings
Fig. 1 is current control type switching power supply module fundamental diagram;
Fig. 2 is voltage close loop control circuit figure;
Fig. 3 is the current closed-loop control circuit.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection range of the present utility model with this.
Compare with the voltage-controlled type Switching Power Supply, current control type switching power supply is a voltage, current double closed-loop control system, can overcome electric current shortcoming out of control, and dependable performance, circuit are simple.
Current-mode control grows up for the shortcoming of voltage-type control, outside having kept the output voltage FEEDBACK CONTROL part of voltage-controlled type, has increased again a current feedback link.
Current control type switching power supply is a voltage, current double closed-loop control system, and interior ring is current regulator, and outer shroud is voltage control loop.When changing, output voltage cause sampled voltage to change, or load current changes when causing sample rate current to change, the capital changes the output pulse duty factor of pwm circuit or the Frequency generated of PFM circuit, thereby changes output voltage values, reaches the purpose of output voltage stabilization.Inside modules principle control principle drawing as shown in Figure 1.
The utility model is applied to the PI control circuit in the dc charging device, and consists of two closed-loop controls by voltage close loop control circuit and current closed-loop control circuit.
This PI control circuit mainly is to adopt universal control chip, mainly formed by operational amplifier and peripheral circuit, output voltage with the system acquisition processing, the magnitude of current, device is quantitatively default, device current-sharing semaphore compares calculation process, at last controlled quentity controlled variable is delivered to PWM(Pulse Width Modulation) generator or PFM (Pulse frequency modulation) generator, change output voltage and the electric current of dc charging device, output voltage or electric current are not changed with load variations or electrical network, can reach thus the purpose of voltage stabilizing and current stabilization.
The PI control circuit consists of physical circuit such as Fig. 2, shown in Figure 3 by voltage close loop control circuit and the two closed-loop controls of current closed-loop control circuit.Wherein, the voltage close loop control circuit as shown in Figure 2, error operational amplifier U6A and on every side resistance R 43, capacitor C 21, C22 etc. consist of the PI circuit.VFB is the output voltage sampled value of dc charging device, is connected to error operational amplifier U6A reverse input end through resistance R 63, R44; VREF is reference voltage value; VJL is parallel operation current equalizing bus bar magnitude of voltage, VADJ is outside set-point, by resistance R 47, R45 dividing potential drop, obtain a given magnitude of voltage, error originated from input operational amplifier U6A normal phase input end, VOSC is for adjusting voltage, and error operational amplifier U6A output is connected to the adjustment voltage VOSC end that outputs to signal generator through a resistance R 42.When the output voltage of dc charging device changes or during the settings conversion, the corresponding variation will occur VOSC; As output voltage sampled value VFB during less than outside set-point VADJ, VOSC will become greatly, make module voltage output become large, and output voltage sampled value VFB also will become greatly, until it equates with outside set-point VADJ; In like manner, when exporting sampled value VFB greater than outside set-point VADJ, VOSC will diminish, until output voltage sampled value VFB equates with outside set-point VADJ.
The current closed-loop control circuit as shown in Figure 3, error operational amplifier U8A and on every side resistance R 66, capacitor C 34, C38 etc. consist of the PI circuit.Wherein, IS-is the output current sampled value of dc charging device, is connected to error operational amplifier U8A normal phase input end through resistance R 74, piezo-resistance RV3; VREF is reference voltage value, is connected to error operational amplifier U8A normal phase input end through resistance R 77; IADJ is the output current limit value of dc charging device, by resistance R 76, R75 dividing potential drop, obtains a given magnitude of voltage, error originated from input operational amplifier U8A inverting input.Error operational amplifier U8A output links to each other with the adjustment voltage VOSC of voltage close loop control circuit output through a diode D3, a resistance R 81.When normal, the output current sampled value is no more than current limit value, and error operational amplifier U8A output end voltage is greater than current VOSC value, and output is mainly controlled by the voltage close loop control circuit to module voltage; When module output overcurrent or current limit value diminish, the current closed-loop control circuit will drag down the VOSC value, so that module output voltage fast reducing, thereby reduce the module load current, reached the purpose of quick current-limiting.
Above two kinds of PI circuit are a voltage, current double closed-loop control system, interior ring is current regulator, and outer shroud is voltage control loop, has realized voltage, the current double closed-loop control system of dc charging device, overcome electric current shortcoming out of control, and dependable performance, circuit are simple.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and distortion, these improvement and distortion also should be considered as protection range of the present utility model.
Claims (6)
1. the PI control circuit in the dc charging device, it is characterized in that, comprise an output and adjust the current control circuit that the voltage control circuit and of voltage VOSC replenishes the described adjustment voltage VOSC of adjusting, all comprise a PI circuit in described voltage control circuit and the current control circuit; Described PI circuit comprises an error operational amplifier, be parallel to a resistance and the electric capacity of connecting between error operational amplifier reverse input end and the output;
In the described voltage control circuit, error operational amplifier reverse input end in the PI circuit of output voltage sampled value VFB in resistance is connected to it of dc charging device, reference voltage value VREF, parallel operation current equalizing bus bar magnitude of voltage VJL, the outside set-point VADJ through regulating all input this error operational amplifier normal phase input end, and this error operational amplifier output terminal is used for exporting described adjustment voltage VOSC;
In the described current control circuit, the output current sampled value of dc charging device, reference voltage value VREF all are connected to the error operational amplifier normal phase input end in its interior PI circuit; The output current limit value IADJ of dc charging device is through regulating this error operational amplifier inverting input of input, and this error operational amplifier output terminal links to each other through the adjustment voltage VOSC of a diode with described voltage control circuit output.
2. the PI control circuit in the dc charging device according to claim 1, it is characterized in that, described outside set-point VADJ obtains a given magnitude of voltage by the divider resistance dividing potential drop, inputs the error operational amplifier normal phase input end in the described voltage control circuit.
3. the PI control circuit in the dc charging device according to claim 1 is characterized in that, the error operational amplifier output terminal in the described voltage control circuit is connected to signal generator through an output resistance, adjusts voltage VOSC to signal generator output.
4. the PI control circuit in the dc charging device according to claim 1, it is characterized in that, the output current sampled value of dc charging device and reference voltage value VREF are connected to error operational amplifier normal phase input end in the described current control circuit by another resistance respectively.
5. the PI control circuit in the dc charging device according to claim 1, it is characterized in that, the output current limit value IADJ of dc charging device obtains another given magnitude of voltage through another divider resistance dividing potential drop, inputs the error operational amplifier inverting input in the described current control circuit.
6. the PI control circuit in the dc charging device according to claim 1 is characterized in that, the error operational amplifier output terminal in the described current control circuit is connected with described diode cathode, and described diode cathode is connected to adjusts voltage VOSC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220372861 CN202737516U (en) | 2012-07-31 | 2012-07-31 | PI control circuit in direct current charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220372861 CN202737516U (en) | 2012-07-31 | 2012-07-31 | PI control circuit in direct current charging device |
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| Publication Number | Publication Date |
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| CN202737516U true CN202737516U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220372861 Expired - Lifetime CN202737516U (en) | 2012-07-31 | 2012-07-31 | PI control circuit in direct current charging device |
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| CN (1) | CN202737516U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980653A (en) * | 2019-04-25 | 2019-07-05 | 北京卫星制造厂有限公司 | A kind of long-range grid-connected voltage control system of spacecraft |
-
2012
- 2012-07-31 CN CN 201220372861 patent/CN202737516U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980653A (en) * | 2019-04-25 | 2019-07-05 | 北京卫星制造厂有限公司 | A kind of long-range grid-connected voltage control system of spacecraft |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: NANJING SAC URBAN AND POWER GRID AUTOMATION ENGINEERING CO.,LTD. Assignor: Guodian Nanjing Automation Co.,Ltd. Contract record no.: 2014320000483 Denomination of utility model: PI control circuit in direct current charging device Granted publication date: 20130213 License type: Exclusive License Record date: 20140609 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: NANJING SAC URBAN AND POWER GRID AUTOMATION ENGINEERING CO.,LTD. Assignor: Guodian Nanjing Automation Co.,Ltd. Contract record no.: 2014320000483 Date of cancellation: 20181016 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |