CN102170234A - Digital control system for DC/DC converter - Google Patents
Digital control system for DC/DC converter Download PDFInfo
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- CN102170234A CN102170234A CN2011101058398A CN201110105839A CN102170234A CN 102170234 A CN102170234 A CN 102170234A CN 2011101058398 A CN2011101058398 A CN 2011101058398A CN 201110105839 A CN201110105839 A CN 201110105839A CN 102170234 A CN102170234 A CN 102170234A
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- 238000003745 diagnosis Methods 0.000 abstract description 8
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- 230000010363 phase shift Effects 0.000 abstract description 4
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Abstract
The invention discloses a digital control system for a DC/DC converter, which aims to realize the functions of current and voltage proportion integration differentiation (PID) algorithm control, pulse-width modulation (PWM) driving control, fault diagnosis, communication with the whole vehicle and the like in the DC/DC converter of an electric vehicle. The digital control system for the DC/DC converter comprises a power conversion circuit, wherein the power conversion circuit comprises an input end, a full-bridge phase shift circuit and an output end which are sequentially connected; the full-bridge phase shift circuit consists of four field effect tubes; and sampling circuits are arranged at the input end and the output end. The key is that: the digital control system further comprises a control unit, wherein the control unit comprises a control module, and an analogue-to-digital conversion module, a pulse-width modulation module and a controller area network (CAN) gateway module which are connected with the control module; the output end of the pulse-width modulation module is connected with the control ends of the field effect tubes; and the control module receives information from the input and output ends by the analogue-to-digital conversion module and the sampling circuits, and controls the output of the pulse-width modulation module according to the information.
Description
Technical field
The invention belongs to the vehicle technology field, specially refer to a kind of DC/DC converter Digitizing And Control Unit of used for electric vehicle.
Background technology
In the development of modern electric automobile, at present all between 1KW-2KW, the voltage of the high voltage input terminal of DC/DC converter is 300V to the car load low-voltage electrical of electric automobile with electric loading, and the voltage of low-voltage output is 14V.The topological structure of DC/DC converter in this case all adopts full-bridge topologies basically, driven MOS FET adopts the full bridge phase shift PWM control technology, other field or previous partially mixed power car, the DC/DC in the electric motor car are realized by circuit and hardware chip, do not write with a brush dipped in Chinese ink into software, in control, just be difficult for like this realizing upgrading, can not carry out failure diagnosis, can not carry out diagnosis communication with entire car controller.
Summary of the invention
The objective of the invention is to propose a kind of DC/DC converter Digitizing And Control Unit, with the pid algorithm control of electric current, voltage in the DC/DC transducer of realizing electric automobile, PWM drive controlling, failure diagnosis, and car load carry out functions such as communication.
DC/DC converter Digitizing And Control Unit of the present invention comprises circuit for power conversion, full-bridge phase shifting circuit, output that described circuit for power conversion comprises successively the input that connects, is made up of four field effect transistor, be provided with sample circuit on described input and the output, key is also to comprise a control unit, analog-to-digital conversion module, pulse width modulation module, CAN gateway module that described control unit comprises a control module and links to each other with control module, the output of described pulse width modulation module links to each other with the control end of described field effect transistor; Described control module receives the information of input, output by analog-to-digital conversion module and sample circuit, and according to the output of this information Control pulse width modulation module.
Control module is by the input of sample circuit received power change-over circuit, the information of output, and according to the output of this information Control pulse width modulation module, utilize the PWM ripple to control the conducting and the shutoff of each field effect transistor, thereby realized the voltage and the electric current output of real-time control output end, guaranteed that the output of low-voltage output meets the requirements.Simultaneously, control module can also be carried out communication by CAN gateway module and car load, realizes information sharing.Above-mentioned full-bridge phase shifting circuit has been a known technology, and is widely used in rectification circuit, repeats no more herein.
In addition, after various fault-signals in the circuit for power conversion transfer to control module, is that diagnostic trouble code stores in the control module by the fault processing module in the software according to the arrangement of KWP2000 agreement, sends entire car controller or vehicle-borne diagnosis instrument to by the CAN bus based on the KWP2000 agreement then.KWP2000 is the very perfect vehicle-mounted fault diagnosis consensus standard of a cover, the hierarchy of agreement makes KWP2000 Diagnosis Service and do not rely on certain particular network medium, and its application layer can be transplanted on any physical layer and the data link layer protocol.
Further, described output is serially connected with the switch that field effect transistor constitutes, described control module links to each other by the control end of pulse width modulation module with the field effect transistor that constitutes switch, by feedback, control module is control output voltage and electric current better just, guarantees that the output of low-voltage output meets the requirements.
Further, described pulse width modulation module links to each other with the control end of each field effect transistor by isolating transformer, to reach the electric purpose of separating of high and low pressure, guarantees the safety of pulse width modulation module.
Specifically, the sample circuit of described input setting is current sampling circuit and voltage sampling circuit, and described current sampling circuit is a current transformer.The sample circuit that is provided with on the described output is current sampling circuit and voltage sampling circuit.
Further, described control module links to each other with the voltage sampling circuit of input by optical coupling isolator, with the protection control module.
Further, described control unit preferably adopts the TMS320F28035 chip of TI company, is provided with control module, analog-to-digital conversion module and CAN gateway module in this chip, can be realized the generation of control and pwm signal by software, thereby simplify hardware components greatly, and improve reliability.
DC/DC converter Digitizing And Control Unit of the present invention can realize electric current, voltage in the DC/DC transducer of electric automobile pid algorithm control, PWM drive controlling, failure diagnosis, carry out functions such as communication with car load, hardware circuit is simple, the reliability height.
Description of drawings
Fig. 1 is the fundamental block diagram of digital signal processor pulse-width modulation DC/DC converter.
Fig. 2 is for driving the PWM oscillogram of full-bridge phase shifting circuit.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings.
Embodiment 1:
As shown in Figure 1, the DC/DC converter Digitizing And Control Unit of present embodiment comprises circuit for power conversion and a control unit that adopts the TMS320F28035 chip formation of TI company, full-bridge phase shifting circuit, output that described circuit for power conversion comprises successively the input that connects, is made up of four field effect transistor Q1, Q2, Q3, Q4, wherein input is connected with 336 volts high-tension battery 1 and filter 2, and output is connected with the full-bridge phase shifting circuit with 3 by coil; Be provided with sample circuit on input and the output, wherein the sample circuit of input setting is current sampling circuit and voltage sampling circuit, described current sampling circuit is the current transformer 4 that is serially connected with in the input anode, and input current is sampled as Ip, Ip-R, and input voltage is sampled as Vp; The sample circuit that is provided with on the output is current sampling circuit and voltage sampling circuit, and output current is sampled as Ios, and output voltage is sampled as Vout, is serially connected with the switch that field effect transistor Q5, Q6 constitute in the output.
The pulsewidth of Q1 and Q4 and Q2 and Q3 is T/2 (T is switch periods 5uS), a complete DCDC before the change-over period half section: the common conducting T/5 of Q1 and Q4, at second half section Q2 and the common conducting T/5 of Q3.The time of conducting is 2T/5 in such complete cycle.The primary and secondary coil ratio of high-low pressure isolating transformer is 10:1.So output voltage V o=Vin * 0.1 * (2T/5/T)=13.5V.
Analog-to-digital conversion module (i.e. ADC among the figure), pulse width modulation module (i.e. PWM1 among the figure～6), CAN gateway module (i.e. CAN among the figure) that control unit comprises a control module (i.e. CPU among the figure) and links to each other with control module, wherein the output of pulse width modulation module connects by the control end (being 1A, 2A, 1B, 2B, 3A, 3B) of isolating transformer 5 with described field effect transistor Q1, Q2, Q3, Q4, Q5, Q6; Described control module receives input by analog-to-digital conversion module and each sample circuit; the input current of output; input voltage; output current; (wherein control module is converted into magnitude of voltage by an analog to digital converter ADC7476 digital quantity of 12Bit to information such as output voltage; and then link to each other with the input voltage Vp of input by optical coupling isolator 6; with the protection control module); and according to the output of above-mentioned information Control pulse width modulation module; utilize the PWM ripple to control the conducting and the shutoff of each field effect transistor; thereby realize the voltage and the electric current output of real-time control output end, guarantee that the output of low-voltage output meets the requirements.Simultaneously, control module can also be carried out communication by CAN gateway module and car load, realizes information sharing.
Control unit TMS320F28035 powers by DC/DC chip 7.
Q when completely modulating specifically,
1～Q
4Drive waveforms as shown in Figure 2: the driving frequency of four switches of full-bridge (MOSFET) gate pulse PWM ripple is 200KHZ, and the cycle of each PWM is 5us.The PWM ripple drive waveforms PWM1 of the upper and lower brachium pontis Q1 in the left side of full-bridge, Q3 and the Dead Time (Dead time) between the PWM2 are 100ns, and the Dead Time (Dead time) of the PWM ripple drive waveforms PWM3 of the upper and lower brachium pontis Q2 in the right, Q4 and PWM4 is 100ns.Guarantee that with this Q1 turn-offs, Q2 connects (Q3 turn-offs, and Q4 connects) moment enough guard times, avoids causing the short circuit of upper and lower brachium pontis.A common conducting angle time T on is all arranged between gate pulse PWM1 and PWM4, PWM2 and the PWM3 during phase shifting control, therefore, can come control output voltage by the size of control ON time Ton.In digitial controller, can come control output voltage, promptly can make Adjustable Output Voltage by phase shifting control with software set Ton.
PWM1, PWM2, PWM3, PWM4 be the PWM ripple of the PWM port one A above the corresponding diagram 1,1B, 2A, 2B output respectively.Conducting Dead Time between PWM1 and PWM2, PWM3 and the PWM4 is 100ns, there is voltage difference at the secondary coil two ends of transformer during the common conducting of the common conducting of PWM1 and PWM4, PWM2 and PWM2, secondary end has voltage output, thereby charges to lead acid accumulator.
When software carried out phase shifting control realization Adjustable Output Voltage, software was to current inner loop and outer voltage is carried out digital filtering and the saturated PID of digital anti-integration regulates, and makes the output voltage stabilizing.Program is carried out the saturated PID adjusting of anti-integration according to given output voltage reference value and charging current reference value, and when elementary input voltage changed, secondary output voltage was stabilized in set-point; And when secondary load voltage has fluctuation, also can regulate the phase shift size, the control charging current value according to given current reference.What digital pid was regulated employing is increment type PID control, because the TMS320F28035 chip has powerful computing ability and EV (Event Manager) module, pwm signal can be obtained easily, therefore, hardware components can be simplified greatly, the control circuit part can all be omitted and be replaced by software, and promptly software is realized the generation of PI calculation control and pwm signal.
Claims (7)
1. DC/DC converter Digitizing And Control Unit, comprise circuit for power conversion, full-bridge phase shifting circuit, output that described circuit for power conversion comprises successively the input that connects, is made up of four field effect transistor, be provided with sample circuit on described input and the output, it is characterized in that also comprising a control unit, analog-to-digital conversion module, pulse width modulation module, CAN gateway module that described control unit comprises a control module and links to each other with control module, the output of described pulse width modulation module links to each other with the control end of described field effect transistor; Described control module receives the information of input, output by analog-to-digital conversion module and sample circuit, and according to the output of this information Control pulse width modulation module.
2. DC/DC converter Digitizing And Control Unit according to claim 1 is characterized in that described output is serially connected with the switch that field effect transistor constitutes, and described control module links to each other by the control end of pulse width modulation module with the field effect transistor that constitutes switch.
3. DC/DC converter Digitizing And Control Unit according to claim 1 and 2 is characterized in that described pulse width modulation module links to each other with the control end of each field effect transistor by isolating transformer.
4. DC/DC converter Digitizing And Control Unit according to claim 1 and 2, the sample circuit that it is characterized in that described input setting is current sampling circuit and voltage sampling circuit, described current sampling circuit is a current transformer.
5. DC/DC converter Digitizing And Control Unit according to claim 4 is characterized in that described control module links to each other with the voltage sampling circuit of input by optical coupling isolator.
6. DC/DC converter Digitizing And Control Unit according to claim 1 and 2 is characterized in that the sample circuit that is provided with on the described output is current sampling circuit and voltage sampling circuit.
7. DC/DC converter Digitizing And Control Unit according to claim 1 and 2 is characterized in that described control unit is the TMS320F28035 chip of TI company.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101058398A CN102170234A (en) | 2011-04-27 | 2011-04-27 | Digital control system for DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101058398A CN102170234A (en) | 2011-04-27 | 2011-04-27 | Digital control system for DC/DC converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336426A (en) * | 2013-07-12 | 2013-10-02 | 深圳市航天新源科技有限公司 | Device and method for allowing output characteristic of converter to be fit with load characteristic |
| CN103454543A (en) * | 2013-09-25 | 2013-12-18 | 奇瑞汽车股份有限公司 | Method for diagnosing faults of bidirectional DC-DC converter |
| CN103595256A (en) * | 2013-11-20 | 2014-02-19 | 深圳市航盛电子股份有限公司 | DC/DC power system for electric vehicle |
| CN103901251A (en) * | 2012-12-26 | 2014-07-02 | 现代摩比斯株式会社 | Electric current detection apparatus of low voltage dc-dc converter for electric vehicle |
| CN106487080A (en) * | 2016-12-05 | 2017-03-08 | 江苏索尔新能源科技股份有限公司 | Vehicle power all-in-one numerical control device, system and method |
Citations (3)
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| CN2466848Y (en) * | 2001-01-15 | 2001-12-19 | 广东南方通信集团公司 | Rectifying module for switching supply unit |
| US20070096706A1 (en) * | 2005-10-31 | 2007-05-03 | Kabushiki Kaisha Toshiba | Power supply control method and power supply apparatus |
| CN101604165A (en) * | 2009-07-10 | 2009-12-16 | 奇瑞汽车股份有限公司 | A kind of hybrid vehicle onboard diagnostic system and diagnostic method thereof |
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2011
- 2011-04-27 CN CN2011101058398A patent/CN102170234A/en active Pending
Patent Citations (3)
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| CN2466848Y (en) * | 2001-01-15 | 2001-12-19 | 广东南方通信集团公司 | Rectifying module for switching supply unit |
| US20070096706A1 (en) * | 2005-10-31 | 2007-05-03 | Kabushiki Kaisha Toshiba | Power supply control method and power supply apparatus |
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Non-Patent Citations (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901251A (en) * | 2012-12-26 | 2014-07-02 | 现代摩比斯株式会社 | Electric current detection apparatus of low voltage dc-dc converter for electric vehicle |
| CN103336426A (en) * | 2013-07-12 | 2013-10-02 | 深圳市航天新源科技有限公司 | Device and method for allowing output characteristic of converter to be fit with load characteristic |
| CN103336426B (en) * | 2013-07-12 | 2016-12-28 | 深圳市航天新源科技有限公司 | Make the device and method of changer output characteristics and load characteristic matching |
| CN103454543A (en) * | 2013-09-25 | 2013-12-18 | 奇瑞汽车股份有限公司 | Method for diagnosing faults of bidirectional DC-DC converter |
| CN103454543B (en) * | 2013-09-25 | 2016-03-16 | 奇瑞汽车股份有限公司 | A kind of method for diagnosing faults of bi-directional DC-DC converter |
| CN103595256A (en) * | 2013-11-20 | 2014-02-19 | 深圳市航盛电子股份有限公司 | DC/DC power system for electric vehicle |
| CN106487080A (en) * | 2016-12-05 | 2017-03-08 | 江苏索尔新能源科技股份有限公司 | Vehicle power all-in-one numerical control device, system and method |
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Application publication date: 20110831 |