CN113271008A - Multi-channel fast response inductive load controllable current driving device - Google Patents
Multi-channel fast response inductive load controllable current driving device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
Abstract
The invention provides a multi-channel fast response inductive load controllable current driving device, which comprises a control unit, a continuously adjustable boosting module and a plurality of channels, wherein the control unit is used for controlling the boosting module to continuously boost the inductive load; a continuous adjustable voltage reduction module, a voltage detection conditioning circuit, a current detection conditioning circuit, an inductive load and a discharge circuit are arranged in a channel of the driving device; the voltage boosting and reducing adjustability is realized through the continuously adjustable voltage boosting module and the continuously adjustable voltage reducing module, and the current drive of multiple channels is ensured on the premise of not changing the power supply voltage; the voltage detection conditioning circuit and the current detection conditioning circuit are controlled in a double closed loop mode to provide feedback quantity, the continuously adjustable voltage boosting module is added in front of the continuously adjustable voltage reducing module, the discharging circuit is added behind the continuously adjustable voltage reducing module to achieve voltage and current adjustment and drive current rising and falling tracking, multi-channel linear inductive load can be driven, and high-frequency controllable drive current with quick response can be generated.
Description
Technical Field
The invention relates to the technical field of current driving, in particular to a multi-channel fast response inductive load controllable current driving device.
Background
The current driver is an intermediate circuit used between a main circuit and a controller to amplify a controller output signal, provides a required current for the main circuit, and is widely applied in the fields of automobile research and production, such as a vehicle-mounted power supply, a vehicle-mounted control system, a multi-channel charger, a vehicle-mounted lighting field and the like. With the high demand of people on system integration and the response to new loads, new requirements on current drive are also put forward, and a controllable multi-channel current driver is a mainstream direction. Such as an inductive element coil and an electromagnetic valve in the magnetorheological vibration reduction technology and the damping continuous adjustable vibration reduction technology, the current requirement of the inductive element coil and the electromagnetic valve has very high technical indexes. Specifically, the working current is required to have the characteristics of high response speed, strong adjustability and the like. With the above-mentioned increasing requirements for current drivers, the research of controllable multi-channel current drivers is increasingly emphasized.
The traditional multi-channel current driver is mostly in a fixed current output form, and a linear amplification circuit or a fixed duty ratio switching power supply is used for outputting fixed current to drive a load, such as an LED lighting system. And a part of multi-channel current drivers are in a multi-gear constant current output mode, and a plurality of different current driving loads can be selected by utilizing a plurality of preset switching power supplies with fixed duty ratios.
Conventional current drivers have some disadvantages. On the one hand, the conventional multi-channel current driving device generally operates by using a power supply with a fixed voltage to output a fixed driving current. When a plurality of loads of different types need to be accessed simultaneously, the difference of equivalent loads accessed by different channels is large, and the loads need to be additionally provided with output regulating circuits. On the other hand, the current of the traditional current driver can not be continuously adjusted, the response is slow, the functions of quick adjustment and quick response are lacked, and the application scene with the requirement of quick and accurate response to the driving current can not be met.
Disclosure of Invention
In order to solve the problems in the prior art, the invention designs the multi-channel fast-response inductive load controllable current driving device, which can drive a multi-channel linear inductive load and generate high-frequency controllable fast-response driving current.
The invention adopts the following technical scheme:
a multi-channel fast response inductive load controllable current driving device is characterized by comprising a control unit, a continuously adjustable boosting module and a plurality of channels; the input end of the continuously adjustable boosting module is used for being connected with an external power supply, the output end of the continuously adjustable boosting module is connected with the input end of each channel, the output end of each channel is connected with the control unit, and the control unit is also connected with the continuously adjustable boosting module;
each channel comprises a continuous adjustable voltage reduction module, a voltage detection conditioning circuit, a current detection conditioning circuit, an inductive load and a discharge circuit; the input end of the continuous adjustable voltage reduction module is connected with the output end of the continuous adjustable voltage boosting module, the output end of the continuous adjustable voltage reduction module is sequentially connected with an inductive load and a discharging circuit, and the voltage detection conditioning circuit and the current detection conditioning circuit are arranged between the continuous adjustable voltage reduction module and the inductive load; the continuous adjustable voltage reduction module, the voltage detection conditioning circuit, the current detection conditioning circuit and the discharge circuit are all connected with the control unit;
the continuously adjustable boosting module performs boosting conversion processing on the voltage of an external power supply and then transmits the voltage to the continuously adjustable voltage reducing module, and the voltage is fed back to the control unit through the voltage detection conditioning circuit; the control unit receives a real-time channel selection command sent by the upper computer and controls the continuously adjustable voltage reduction modules of all the channels to select the channels to be opened or closed; the control unit receives real-time output voltage and load current signals detected by a voltage detection conditioning circuit and a current detection conditioning circuit in a corresponding channel, and estimates load impedance of the corresponding channel; the control unit calculates and determines the output voltage of the continuously adjustable boosting module according to the estimated load impedance of the corresponding channel and a corresponding channel required current command received from the upper computer and by combining the allowable overshoot range and the response time, and further controls the output voltage of the continuously adjustable boosting module to enable the corresponding channel load to obtain the required driving current; the control unit controls the PWM of the discharge circuit in real time to adjust the duty ratio to realize different discharge speeds, and further realizes quick response of output current reduction.
Preferably, the continuously adjustable boost module comprises a boost circuit and a boost detection conditioning circuit which are connected with each other, the boost circuit comprises a first inductor, a first diode, a first MOSFET driving circuit and a first capacitor, one end of the first inductor is connected with the positive electrode of an external power supply, the other end of the first inductor is connected with the positive electrode of the first diode, the negative electrode of the first diode and one end of the first capacitor are both connected to the output end of the continuously adjustable boost module, a lead between the first inductor and the first diode is connected with the drain electrode of the first MOSFET, the source electrode of the first MOSFET and the other end of the first capacitor are both connected with the negative electrode of the external power supply, the gate of the first MOSFET is connected with the output end of the first MOSFET driving circuit, and the input end of the first MOSFET driving circuit is connected with the control unit; the boost detection conditioning circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a boost signal conditioning circuit, wherein the voltage of the first voltage-dividing resistor and the second voltage-dividing resistor after being connected in series is the output voltage of the continuously adjustable boost module, a lead between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with the input end of the boost signal conditioning circuit, and the output end of the boost signal conditioning circuit is connected with the control unit;
the control unit controls a first MOSFET driving circuit in the continuously adjustable boosting circuit to send a corresponding driving signal to control the duty ratio of the first MOSFET in real time and adjust the output voltage of the continuously adjustable boosting module; and the control unit receives voltage feedback information provided by a boosting signal conditioning circuit in the continuously adjustable boosting module and adjusts the driving signal in real time according to the feedback information.
Preferably, the continuously adjustable voltage reducing module comprises a second MOSFET, a second MOSFET driving circuit, a second inductor, a second diode and a second capacitor, the drain electrode of the second MOSFET is connected with the positive electrode of the output end of the continuously adjustable voltage increasing module, the source electrode of the second MOSFET is connected with the one end of the second inductor and the negative electrode of the second diode respectively, the grid electrode of the second MOSFET driving circuit is connected with the output end of the second MOSFET driving circuit, the other end of the second inductor and one end of the second capacitor are connected to the output end of the continuously adjustable voltage reducing module, the positive electrode of the second diode and the other end of the second capacitor are connected with the negative electrode of the output end of the continuously adjustable voltage increasing module, and the input end of the second MOSFET driving circuit is connected with the control unit.
Preferably, the voltage detection conditioning circuit in the channel comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a real-time voltage signal conditioning circuit; the third voltage dividing resistor and the fourth voltage dividing resistor are connected in series and then bridged at the output end of the continuous adjustable voltage reduction module, the voltage after the series connection is the output voltage of the voltage detection conditioning circuit, a lead between the third voltage dividing resistor and the fourth voltage dividing resistor is connected with the input end of the real-time voltage signal conditioning circuit, and the output end of the real-time voltage signal conditioning circuit is connected with the control unit.
Preferably, the current detection conditioning circuit in the channel comprises a series resistor and a current signal conditioning circuit; the input end of the series resistor is connected with the negative electrode of the output end of the voltage detection conditioning circuit, the output end of the series resistor is connected with the input end of the current signal conditioning circuit, and the output end of the current signal conditioning circuit is connected with the control unit.
Preferably, the control unit controls a second MOSFET driving circuit in the continuously adjustable buck module to send a corresponding driving signal to control the duty ratio of the second MOSFET in real time according to a real-time channel selection command provided by the upper computer, the channel is closed when the duty ratio is zero, and the channel is communicated when the duty ratio is not zero.
Preferably, the control unit controls a second MOSFET driving circuit in the continuously adjustable buck module to send a corresponding driving signal to control the duty ratio of the MOSFET in real time according to a real-time current demand command provided by the upper computer, and adjusts the output voltage and current of the corresponding channel; meanwhile, the control unit receives voltage feedback information provided by the real-time voltage signal conditioning circuit and current feedback information provided by the current signal conditioning circuit, and adjusts the driving signal in real time according to the feedback information to control the output voltage and current of the corresponding channel.
Preferably, the inductive load comprises a coil winding of a magnetorheological damping system and/or a coil winding of a damping continuously adjustable damping system solenoid valve.
Preferably, the discharge circuit includes a discharge resistor, a third MOSFET, and a third MOSFET driving circuit; one end of the discharge resistor is connected with the positive electrode of the output voltage of the inductive load, the other end of the discharge resistor is connected with the drain electrode of the third MOSFET, the source electrode of the third MOSFET is connected with the negative electrode of the output voltage of the inductive load, the grid electrode of the third MOSFET is connected with the output end of the third MOSFET drive circuit, and the input end of the third MOSFET drive circuit is connected with the control unit; the control unit controls a third MOSFET driving circuit in the discharge circuit to send a corresponding driving signal to control the duty ratio of the third MOSFET to control the shunt of the discharge circuit and control the discharge time and intensity according to a real-time current demand command provided by the upper computer and current feedback information provided by the current signal conditioning circuit.
Preferably, the boost signal conditioning circuit and the real-time voltage signal conditioning circuit both comprise a first operational amplifier, a first clamping diode and a first filter capacitor; the non-inverting input end of the first operational amplifier is connected with a lead between the two divider resistors, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the anode of the first clamping diode through the first filter capacitor, and the cathode of the first clamping diode is connected with an external power supply; meanwhile, the output end of the first operational amplifier is connected with the control unit, and circuit signals are converted into digital signals to be fed back to the control unit;
and/or the current signal conditioning circuit comprises a second operational amplifier, a second clamping diode and a second filter capacitor; the non-inverting input end of the second operational amplifier is connected with the output end of the series resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is connected with the anode of the second clamping diode through the second filter capacitor, and the cathode of the second clamping diode is connected with an external power supply; meanwhile, the output end of the second operational amplifier is connected with the control unit, and circuit signals are converted into digital signals to be fed back to the control unit.
The invention has the beneficial effects that:
the invention provides a multi-channel fast-response inductive load controllable current driving device, which is provided with a continuously adjustable boosting module in front, and a continuously adjustable voltage reducing module, a voltage detection conditioning circuit, a current detection conditioning circuit, an inductive load and a discharging circuit are arranged in a channel of the driving device. Realize through continuously adjustable module of stepping up and continuously adjustable voltage reduction module that steps up adjustably with step down adjustably, guarantee the current drive of multichannel simultaneously under the prerequisite that does not change mains voltage, increase continuously adjustable module of stepping up before continuously adjustable voltage reduction module, can guarantee that continuously adjustable voltage reduction module can be when tracing demand output current and carrying out PID regulation sufficient overshoot. The voltage detection and conditioning circuit and the current detection and conditioning circuit are controlled in a double closed loop mode to provide feedback quantity, voltage and current are accurately adjusted and driving current rises and falls to track by adding the continuous adjustable voltage boosting module in front of the continuous adjustable voltage reducing module and adding the discharging circuit behind the continuous adjustable voltage reducing module, response is rapid, and control is accurate. The function of the multi-channel fast-response inductive load controllable current driving device is optimized by using the technical means of low energy consumption and low cost, the single-channel or multi-channel linear inductive load is driven, the high-frequency controllable fast-response driving current is generated, and the system efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a multi-channel fast-response inductive load controllable current driving device according to the present invention.
Fig. 2 is a schematic diagram of an embodiment of a continuously adjustable boost module.
Fig. 3 is a schematic diagram of an embodiment of the internal structure of the channel of the multi-channel fast-response inductive load controllable current driving apparatus according to the present invention.
Fig. 4a is a schematic diagram of an embodiment of a boost signal conditioning circuit.
FIG. 4b is a schematic diagram of an embodiment of a real-time voltage signal conditioning circuit.
FIG. 4c is a schematic diagram of an embodiment of a current signal conditioning circuit.
Fig. 5 is a schematic diagram illustrating a correspondence relationship between an output voltage of the continuously adjustable boost module and a step response time of the current driving apparatus.
Detailed Description
The present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of the multi-channel fast-response inductive load controllable current driving device according to the present invention, which shows a basic structure of the multi-channel fast-response inductive load controllable current driving device, and the driving device can provide controllable current driving to the load of each channel in a steady state. As shown in FIG. 1, the current driving device is composed of a control unit, a continuously adjustable boost module and a plurality of channels, wherein the input end of the continuously adjustable boost module is used for being connected with an external power supply VinAnd the output end of the continuously adjustable boosting module is connected with the input end of each channel, the output end of each channel is connected with the control unit, and the control unit is also connected with the continuously adjustable boosting module.
Each channel comprises a continuously adjustable voltage reduction module, a voltage detection conditioning circuit, a current detection conditioning circuit, an inductive load, a discharge circuit and other components. The various channels are distinguished in the figure by the reference number A, B, C … …. For example, the channel A comprises a continuously adjustable voltage reduction module A, a voltage detection conditioning circuit A, a current detection conditioning circuit A, an inductive load A and a discharge circuit A.
The input end of the continuous adjustable voltage reduction module is connected with the output end of the continuous adjustable voltage boosting module, the output end of the continuous adjustable voltage reduction module is sequentially connected with an inductive load and a discharging circuit, and the voltage detection conditioning circuit and the current detection conditioning circuit are arranged between the continuous adjustable voltage reduction module and the inductive load; the continuous adjustable voltage reduction module, the voltage detection conditioning circuit, the current detection conditioning circuit and the discharge circuit are all connected with the control unit; taking the channel a as an example, the input end of the continuously adjustable voltage-reducing module a is connected with the output end of the continuously adjustable voltage-increasing module, the output end of the continuously adjustable voltage-reducing module a is sequentially connected with the inductive load a and the discharging circuit a, and the voltage detecting and conditioning circuit a and the current detecting and conditioning circuit a are located between the continuously adjustable voltage-reducing module a and the inductive load a; the continuously adjustable voltage reduction module A, the voltage detection conditioning circuit A, the current detection conditioning circuit A and the discharge circuit A are all connected with the control unit. Similarly, the channel B and the channel C are not described in detail.
The continuously adjustable boosting module is used for boosting the external power supply voltage VinAfter the voltage boosting conversion processing is carried out, the voltage is transmitted to the continuous adjustable voltage reduction module and then fed back to the control unit through the voltage detection conditioning circuit; the control unit receives a real-time channel selection command provided by the upper computer and controls the continuously adjustable voltage reduction module of each channel to select the channel to be opened or closed; the control unit receives a corresponding channel required current command provided by the upper computer, receives real-time output voltage and load current signals detected by the corresponding channel voltage detection conditioning circuit and the current detection conditioning circuit, and estimates the load impedance of the corresponding channel; the control unit calculates and determines the input voltage required by the corresponding channel according to the estimated load impedance and the required current of the corresponding channel and by combining the PID allowable overshoot range and the response time, and controls the continuously adjustable boosting module to output the voltage V1; the control unit controls the continuous adjustable voltage reduction modules of the corresponding channels to adjust voltage V1, so that the corresponding channel loads obtain required driving current; the control unit controls the discharge circuit of the corresponding channel to discharge quickly, and ensures that the reduction response of the exciting current required by the load is quick. That is to say, the control unit detects the output voltage of the continuously adjustable boosting module, detects the load controllable current and the load voltage of each channel, controls the continuously adjustable boosting module, controls the continuously adjustable voltage reducing module of each channel and controls the discharging circuit of each channel according to the real-time channel selection and the current demand command of the corresponding channel provided by the upper computer, and realizes the rapid tracking and adjustment of the controllable current of the multi-channel fast-response inductive load. And the control unit controls the MOSFET driving signal duty ratio of each channel continuous adjustable voltage reduction module to realize the accurate control of the controllable current of each channel response inductive load by adopting a voltage-current double closed loop PID control method according to a real-time current demand command provided by an upper computer and voltage and current feedback information provided by the voltage detection conditioning circuit and the current detection conditioning circuit.
Fig. 2 is a schematic diagram of an embodiment of a continuously adjustable boost module, which illustrates a basic structure of the continuously adjustable boost module. The input end of the continuously adjustable boosting module is connected with an external 12V voltage source, the continuously adjustable boosting module converts the 12V voltage to generate 12-24V voltage V1, and the output end of the continuously adjustable boosting module is connected with the input end of the continuously adjustable voltage reducing module. In addition, the continuously adjustable voltage increasing module provides a proper output voltage V1, so that the continuously adjustable voltage decreasing module can be ensured to have enough overshoot when carrying out PID adjustment by tracking the required output current. As shown in fig. 2, the continuously adjustable boost module mainly includes two parts: boost circuit and boost detection modulate circuit.
The boost circuit comprises a first inductor L _ bt, a first diode D _ bt, a first MOSFET Q _ bt, a first MOSFET driving circuit and a first capacitor C _ bt. Wherein one end of L _ bt is connected with external power supply VinThe positive poles are connected, the other end of the L _ bt is connected with the positive pole of the D _ bt, the negative pole of the D _ bt and one end of the C _ bt are connected to the output end V of the continuously adjustable boosting module1The lead between the L _ bt and the D _ bt is connected with the drain of the Q _ bt, and the source of the Q _ bt and the other end of the C _ bt are both connected with an external power supply VinThe grid electrode of the Q _ bt is connected with the output end of the first MOSFET driving circuit, and the input end of the first MOSFET driving circuit is connected with the control unit; the boost detection conditioning circuit comprises a first voltage dividing resistor R _ bt1, a second voltage dividing resistor R _ bt2 and a boost signal conditioning circuit, wherein the voltage of the series connection of R _ bt1 and R _ bt2 is the output voltage of the continuously adjustable boost module, and a lead between R _ bt1 and R _ bt2 leads out V _bt1The input end of the boost signal conditioning circuit is connected, and the output end of the boost signal conditioning circuit is connected with the control unit;
the control unit controls a first MOSFET driving circuit in the continuously adjustable boosting circuit to send a corresponding driving signal to control the duty ratio of the first MOSFET in real time, and adjusts the output voltage of the continuously adjustable boosting module to realize the output of stable voltage V1; the continuously adjustable boosting module detects the output voltage V1, the output voltage signal of the continuously adjustable boosting module is transmitted to the control unit after passing through the boosting signal conditioning circuit, the control unit receives voltage feedback information provided by the boosting signal conditioning circuit in the continuously adjustable boosting module, and the driving signal is adjusted in real time according to the feedback information.
Fig. 3 is a schematic diagram of an embodiment of an internal structure of a channel of a multi-channel fast-response inductive load controllable current driving device according to the present invention, and as shown in fig. 3, the internal structure of the channel of the driving device includes a continuously adjustable voltage-reducing module, a voltage detecting and conditioning circuit, a current detecting and conditioning circuit, an inductive load, and a discharging circuit.
The continuously adjustable voltage reduction module comprises a second MOSFET Q _ bk, a second MOSFET driving circuit, a second inductor L _ bk, a second diode D _ bk and a second capacitor C _ bk. The drain electrode of the Q _ bk is connected with the output end V of the continuously adjustable boosting module1The source electrode of the positive electrode is connected with one end of the L _ bk and the cathode of the D _ bk respectively, the grid electrode of the positive electrode is connected with the output end of the second MOSFET driving circuit, the other end of the L _ bk and one end of the C _ bk are connected to the output end of the continuously adjustable voltage reduction module, and the positive electrode of the D _ bk and the other end of the C _ bk are connected with the output end V of the continuously adjustable voltage boosting module1And the input end of the second MOSFET driving circuit is connected with the control unit. The continuous adjustable voltage reduction module receives 12-24V voltage V1 transmitted by the front continuous adjustable voltage increase module, a second MOSFET driving circuit in the continuous adjustable voltage reduction module is connected with the control unit, and the output voltage of the continuous adjustable voltage reduction module is fed back to the control unit through the voltage detection conditioning circuit.
According to voltage and current feedback information provided by the voltage detection conditioning circuit and the current detection conditioning circuit, the voltage V1 input by the voltage boosting module is regulated by the second inductor L _ bk, the second diode D _ bk, the second MOSFET Q _ bk, the second MOSFET driving circuit and the second capacitor C _ bk by the voltage-continuously adjustable voltage-reducing modules of all channels, and appropriate voltage is output, so that the voltage detection conditioning circuit obtains appropriate V _ o1, and the current detection conditioning circuit obtains appropriate I _ o 1.
The voltage detection conditioning circuit and the current detection conditioning circuit are arranged between the continuous adjustable voltage reduction module and the inductive load, and are used for providing feedback quantity for voltage and current double closed-loop control of the continuous adjustable voltage reduction module, providing input for inductive load estimation and providing input for output voltage V1 regulation control of the continuous adjustable voltage boosting module. As shown in fig. 3, the voltage detecting and conditioning circuit includes a third voltage dividing resistor R1, a fourth voltage dividing resistor R2, and a real-time voltageA signal conditioning circuit; the R1 and the R2 are connected in series and then are connected across the output end of the continuous adjustable voltage reduction module, the voltage after the series connection is the output voltage of the voltage detection conditioning circuit, and a lead between the R1 and the R2 leads out V \uo1And the output end of the real-time voltage signal conditioning circuit is connected with the control unit. The voltage detection conditioning circuit obtains V _ o1 with a voltage value within the range of 0-VCC by adopting a voltage division principle, and the voltage signal conditioning circuit outputs V _ o to the control unit to provide a voltage feedback signal for the continuous adjustable voltage reduction module of the channel.
The current detection conditioning circuit comprises a series resistor R _ I and a current signal conditioning circuit; the input end of the R _ I is connected with the negative electrode of the output end of the voltage detection conditioning circuit, the output end of the R _ I is connected with the input end of the current signal conditioning circuit, and the output end of the current signal conditioning circuit is connected with the control unit. The current detection and conditioning circuit adopts a method that an output end is connected with a small resistor R _ I in series, the voltage on the small resistor R _ I is a current signal I _ o1 with the voltage value within the range of 0-VCC, and the current signal I _ o is output to the control unit through the current signal conditioning circuit to provide a current feedback signal for the continuous adjustable voltage reduction module of the channel.
Preferably, the inductive load comprises a coil winding of a magnetorheological vibration damping system, a coil winding of a damping continuous adjustable vibration damping system (CDC) electromagnetic valve, and the like, and the coil winding of the magnetorheological vibration damping system works on the principle that current in a magnetorheological coil of the magnetorheological vibration damping system is adjusted to obtain magnetic fields with different strengths, so that rheological properties of the magnetorheological fluid are changed. Compared with voltage source driving, current source driving can obviously shorten the transient response process of the exciting current in the magneto-rheological coil. The power-on and power-off of the coil winding of the CDC solenoid valve can control the parameters of the coil winding, so that the current driver can be controlled, and the response is relatively quick. The inductive load in the embodiment shown in fig. 3 includes a load resistor R _ load and a load inductor L _ load, where the load resistor R _ load and the load inductor L _ load are connected in series and then connected across the output end of the current detection conditioning circuit, and the voltage after the series connection is the output voltage V of the inductive load0。
The discharge circuit comprises a discharge resistor R _ dis, a third MOSFET Q _ dis and a third MOSFAn ET drive circuit; one end of R _ dis is connected with an inductive load output voltage V0The other end of the R _ dis is connected with the drain electrode of the Q _ dis, and the source electrode of the Q _ dis is connected with the output voltage V of the inductive load0The grid electrode of the Q _ dis is connected with the output end of a third MOSFET driving circuit, and the input end of the third MOSFET driving circuit is connected with the control unit; the control unit controls a third MOSFET driving circuit in the discharge circuit to send a corresponding driving signal to control the duty ratio of the third MOSFET to control the shunt of the discharge circuit and control the discharge time and intensity according to a real-time current demand command provided by the upper computer and current feedback information provided by the current signal conditioning circuit. That is to say, different discharge speeds are realized by controlling the PWM duty ratio of the third MOSFET in the discharge circuit, so that a fast response of output current drop is realized, that is, the current is controllable.
FIG. 4a is a schematic diagram of an embodiment of a boost signal conditioning circuit; FIG. 4b is a schematic diagram of an embodiment of a real-time voltage signal conditioning circuit; the boost signal conditioning circuit and the real-time voltage signal conditioning circuit both comprise a first operational amplifier, a first clamping diode and a first filter capacitor; the lead between the non-inverting input terminal of the first operational amplifier and two voltage dividing resistors (e.g., V of FIG. 4 a)bt1V \uof FIG. 4bo1) Connected, the inverting input of the first operational amplifier and the output of the first operational amplifier (e.g., V of FIG. 4 a)btV \uof FIG. 4bo) Connected, the output of the first operational amplifier (V _, FIG. 4 a)btV \uof FIG. 4bo) The anode of the first clamping diode (D1 and D2 of FIG. 4a, D3 and D4 of FIG. 4 b) is connected with the ground through the first filter capacitor C (C1 of FIG. 4a, C2 of FIG. 4 b), and the cathode of the first clamping diode is connected with an external power supply VCC; at the same time, the output of the first operational amplifier (V _, FIG. 4 a)btV \uof FIG. 4bo) And the control unit is connected with the control unit and used for converting the circuit signal into a digital signal and feeding the digital signal back to the control unit.
FIG. 4c is a schematic diagram of an embodiment of a current signal conditioning circuit; the current signal conditioning circuit comprises a second operational amplifier and a second amplifierA clamping diode and a second filter capacitor; the non-inverting input end of the second operational amplifier and the output end I-of the series resistoro1The inverting input end of the second operational amplifier is connected with the output end I-of the second operational amplifieroConnected to the output terminal I-of the second operational amplifieroThe second filter capacitor C (C3 in FIG. 4C) is connected with the anode of the second clamping diode (D5 and D6 in FIG. 4C) and grounded, and the cathode of the second clamping diode is connected with an external power supply VCC; meanwhile, the output end I-of the second operational amplifieroAnd the control unit is connected with the control unit and used for converting the circuit signal into a digital signal and feeding the digital signal back to the control unit.
When the current driving device works, the control unit receives an instruction from the upper computer, and the instruction content comprises information such as selection of opening and closing of a channel, types of loads connected into the corresponding channel, driving current required by the loads, maximum exciting current of coil windings of each channel, PID (proportion integration differentiation) regulation allowed overshoot range, response time and the like.
The control unit first controls the opening and closing of each channel according to the instruction. The control unit controls the duty ratio of the MOSFET driving signal of the continuous adjustable voltage reduction module (A, B, C …) to be zero or non-zero to realize channel selection according to a real-time channel selection command provided by the upper computer. For example, the instructions are channel A on and channel B off. At the moment, the control unit controls a second MOSFET driving circuit in the continuous adjustable voltage reduction module A unit to send out a driving signal to a second MOSFET Q _ bk, the duty ratio of the driving signal is not zero, the source electrode and the drain electrode of the Q _ bk are connected, the internal circuit of the channel A is electrified, and the channel A is connected. The control unit controls a second MOSFET driving circuit in the continuous adjustable voltage reduction module B unit not to send a driving signal to a second MOSFET Q _ bk, at the moment, the duty ratio of the driving signal is zero, the source electrode and the drain electrode of the Q _ bk are not communicated, the internal circuit of the channel B is disconnected, and the channel B is closed.
If the channel is connected, the voltage detection conditioning circuit and the current detection conditioning circuit in the corresponding channel detect output voltage and load current signals in the channel in real time, the signals are converted into digital signals readable by the control unit through the real-time voltage signal conditioning circuit and the current signal conditioning circuit, and the signals are sent to the control unit. The control unit thus estimates the corresponding channel load impedance. And the control unit calculates and determines the input voltage required by the corresponding channel load according to the estimated load impedance of the corresponding channel and the required current of the corresponding channel contained in the received command, and the factors such as the allowable overshoot range, the response time and the like. The control unit compares the input voltages required by each corresponding channel, and preferably takes the maximum value V1 as the voltage required by the supply, and the voltage V1 can meet the requirement of all channels for driving the load.
Secondly, the control unit controls a first MOSFET driving circuit in the continuously adjustable boosting module to send out a driving signal to a first MOSFET Q _ bt, adjusts the duty ratio of the driving signal, and utilizes the boosting circuit to input power supply voltage VinAdjusted to the desired output voltage V1. At the moment, the boost detection conditioning circuit detects the real-time output voltage V _ bt, the V _ bt is conditioned by the boost signal conditioning circuit and then fed back to the control unit, and the control power supply adjusts the duty ratio of the driving signal in real time according to the feedback, so that the closed-loop control of the output voltage of the continuously adjustable boost module is realized, and the output voltage is accurate and controllable.
And thirdly, the control unit controls the second MOSFET driving circuit in the corresponding channel to send out a driving signal to the second MOSFET Q _ bk, the duty ratio of the driving signal is adjusted, and the voltage V1 is adjusted to be the voltage Vo required by the corresponding load by using the voltage reduction circuit. At the moment, the voltage detection conditioning circuit in the corresponding channel detects the real-time output voltage V _ o1 in the channel, converts the V _ o1 into a digital signal which can be read by the control unit through the real-time voltage signal conditioning circuit and feeds back the digital signal to the control unit; the current detection conditioning circuit in the corresponding channel detects the current I _ o1 in the channel and outputs the current I _ o1 in real time, and the current I _ o1 is converted into a digital signal which can be read by the control unit through the current signal conditioning circuit and is fed back to the control unit. The single control source adjusts the duty ratio of the driving signal in real time according to the feedback, double closed-loop control of the output voltage and the output current of the continuous adjustable voltage reduction module is realized, and the driving current is accurate and controllable.
And finally, the discharge circuit works when the demand current provided by the upper computer is reduced, the control unit monitors the output voltage Vo and the output current Io in real time, and when Io is reduced, the control unit controls the third MOSFET driving circuit to send out a driving signal to the third MOSFET Q _ dis, adjusts the duty ratio of the driving signal, and controls the discharge time and intensity, so that the current driving device is ensured to quickly respond to the demand current reduction command.
The continuously adjustable voltage boosting module controls the output voltage V1 according to the set maximum current of the inductive load and the expected rising response speed, and ensures that the continuously adjustable voltage reducing module obtains proper input voltage, so that the required current rises and responds quickly through PID adjustment. According to the circuit diagram structure of the continuously adjustable boost template, if the voltage V1 is larger, the current flowing through the inductor is larger, the energy stored by the inductor in the charging process is larger, the discharging current is also larger, the MOS transistor (the first MOSFET Q _ bt) is turned off in the discharging process, the inductor (the first inductor L _ bt) discharges the capacitor (the first capacitor C _ bt), and the energy stored by the inductor at the moment is larger, and the discharging current is larger. The larger V1, the faster the output voltage rises. Fig. 5 is a schematic diagram of the correspondence relationship between the output voltage of the continuously adjustable boost module and the step response time of the current driving apparatus, and shows the step response time curves of the output voltage Vo of the current driver when the output voltage V1 of the continuously adjustable boost module is 12V, 14V, and 20V, respectively. As shown in fig. 5, in the case that the output voltage is 12V under the demand current, the higher V1 is, the shorter the rising response time is, for example, t1 < t2 < t3, and the higher the output voltage V1 of the continuously adjustable boost module is, the faster the step response speed of Vo is. Therefore, compared with the common current driving device, the current driving device has the advantage that the response speed of the current driving device is improved by arranging the boosting module in front of the channel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the following claims are intended to cover all modifications, equivalents, and improvements falling within the spirit and scope of the present invention.
Claims (10)
1. A multi-channel fast response inductive load controllable current driving device is characterized by comprising a control unit, a continuously adjustable boosting module and a plurality of channels; the input end of the continuously adjustable boosting module is used for being connected with an external power supply, the output end of the continuously adjustable boosting module is connected with the input end of each channel, the output end of each channel is connected with the control unit, and the control unit is also connected with the continuously adjustable boosting module;
each channel comprises a continuous adjustable voltage reduction module, a voltage detection conditioning circuit, a current detection conditioning circuit, an inductive load and a discharge circuit; the input end of the continuous adjustable voltage reduction module is connected with the output end of the continuous adjustable voltage boosting module, the output end of the continuous adjustable voltage reduction module is sequentially connected with an inductive load and a discharging circuit, and the voltage detection conditioning circuit and the current detection conditioning circuit are arranged between the continuous adjustable voltage reduction module and the inductive load; the continuous adjustable voltage reduction module, the voltage detection conditioning circuit, the current detection conditioning circuit and the discharge circuit are all connected with the control unit;
the continuously adjustable boosting module performs boosting conversion processing on the voltage of an external power supply and then transmits the voltage to the continuously adjustable voltage reducing module, and the voltage is fed back to the control unit through the voltage detection conditioning circuit; the control unit receives a real-time channel selection command sent by the upper computer and controls the continuously adjustable voltage reduction modules of all the channels to select the channels to be opened or closed; the control unit receives real-time output voltage and load current signals detected by a voltage detection conditioning circuit and a current detection conditioning circuit in a corresponding channel, and estimates load impedance of the corresponding channel; the control unit calculates and determines the output voltage of the continuously adjustable boosting module according to the estimated load impedance of the corresponding channel and a corresponding channel required current command received from the upper computer and by combining the allowable overshoot range and the response time, and further controls the output voltage of the continuously adjustable boosting module to enable the corresponding channel load to obtain the required driving current; the control unit controls the PWM of the discharge circuit in real time to adjust the duty ratio to realize different discharge speeds, and further realizes quick response of output current reduction.
2. The multi-channel fast-response inductive load controllable current driving apparatus according to claim 1, the continuously adjustable boosting module comprises a boosting circuit and a boosting detection conditioning circuit which are connected with each other, the booster circuit comprises a first inductor, a first diode, a first MOSFET drive circuit and a first capacitor, one end of the first inductor is connected with the anode of an external power supply, the other end of the first inductor is connected with the anode of the first diode, the cathode of the first diode and one end of the first capacitor are both connected to the output end of the continuously adjustable boosting module, the lead between the first inductor and the first diode is connected to the drain of the first MOSFET, the source electrode of the first MOSFET and the other end of the first capacitor are both connected with the cathode of an external power supply, the grid electrode of the first MOSFET is connected with the output end of the first MOSFET driving circuit, and the input end of the first MOSFET driving circuit is connected with the control unit; the boost detection conditioning circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a boost signal conditioning circuit, wherein the voltage of the first voltage-dividing resistor and the second voltage-dividing resistor after being connected in series is the output voltage of the continuously adjustable boost module, a lead between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with the input end of the boost signal conditioning circuit, and the output end of the boost signal conditioning circuit is connected with the control unit;
the control unit controls a first MOSFET driving circuit in the continuously adjustable boosting circuit to send a corresponding driving signal to control the duty ratio of the first MOSFET in real time and adjust the output voltage of the continuously adjustable boosting module; and the control unit receives voltage feedback information provided by a boosting signal conditioning circuit in the continuously adjustable boosting module and adjusts the driving signal in real time according to the feedback information.
3. The multi-channel fast-response inductive load controllable current driving device according to claim 2, wherein the continuously adjustable voltage-reducing module includes a second MOSFET, a second MOSFET driving circuit, a second inductor, a second diode, and a second capacitor, a drain of the second MOSFET is connected to an anode of an output terminal of the continuously adjustable voltage-increasing module, a source of the second MOSFET is connected to one end of the second inductor and a cathode of the second diode, respectively, a gate of the second MOSFET driving circuit is connected to an output terminal of the second MOSFET, the other end of the second inductor and one end of the second capacitor are both connected to an output terminal of the continuously adjustable voltage-reducing module, an anode of the second diode and the other end of the second capacitor are both connected to a cathode of an output terminal of the continuously adjustable voltage-increasing module, and an input terminal of the second MOSFET driving circuit is connected to the control unit.
4. The multi-channel fast-response inductive load controllable current driving device as claimed in claim 2, wherein the voltage detection conditioning circuit in the channel comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a real-time voltage signal conditioning circuit; the third voltage dividing resistor and the fourth voltage dividing resistor are connected in series and then bridged at the output end of the continuous adjustable voltage reduction module, the voltage after the series connection is the output voltage of the voltage detection conditioning circuit, a lead between the third voltage dividing resistor and the fourth voltage dividing resistor is connected with the input end of the real-time voltage signal conditioning circuit, and the output end of the real-time voltage signal conditioning circuit is connected with the control unit.
5. The multi-channel fast-response inductive load controllable current driving device as claimed in claim 4, wherein said current detection conditioning circuit in the channel comprises a series resistor and a current signal conditioning circuit; the input end of the series resistor is connected with the negative electrode of the output end of the voltage detection conditioning circuit, the output end of the series resistor is connected with the input end of the current signal conditioning circuit, and the output end of the current signal conditioning circuit is connected with the control unit.
6. The multi-channel fast-response inductive load controllable current driving device as claimed in claim 3, wherein the control unit controls the second MOSFET driving circuit in the continuously adjustable buck module to send a corresponding driving signal to control the duty ratio of the second MOSFET in real time according to a real-time channel selection command provided by the upper computer, the channel is closed when the duty ratio is zero, and the channel is connected when the duty ratio is not zero.
7. The multi-channel fast-response inductive load controllable current driving device according to claim 3, wherein the control unit controls the second MOSFET driving circuit in the continuously adjustable buck module to send a corresponding driving signal to control the MOSFET duty ratio in real time according to a real-time demand current command provided by the upper computer, and adjusts the output voltage and current of the corresponding channel; meanwhile, the control unit receives voltage feedback information provided by the real-time voltage signal conditioning circuit and current feedback information provided by the current signal conditioning circuit, and adjusts the driving signal in real time according to the feedback information to control the output voltage and current of the corresponding channel.
8. The multi-channel fast-response inductive load controllable current driving device according to claim 1, wherein said inductive load comprises a coil winding of a magnetorheological damping system and/or a coil winding of a solenoid valve of a damping continuously adjustable damping system.
9. The multi-channel fast-response inductive load controllable current driving device according to claim 1, wherein said discharge circuit comprises a discharge resistor, a third MOSFET, and a third MOSFET driving circuit; one end of the discharge resistor is connected with the positive electrode of the output voltage of the inductive load, the other end of the discharge resistor is connected with the drain electrode of the third MOSFET, the source electrode of the third MOSFET is connected with the negative electrode of the output voltage of the inductive load, the grid electrode of the third MOSFET is connected with the output end of the third MOSFET drive circuit, and the input end of the third MOSFET drive circuit is connected with the control unit; the control unit controls a third MOSFET driving circuit in the discharge circuit to send a corresponding driving signal to control the duty ratio of the third MOSFET to control the shunt of the discharge circuit and control the discharge time and intensity according to a real-time current demand command provided by the upper computer and current feedback information provided by the current signal conditioning circuit.
10. The multi-channel fast-response inductive load controllable current driving device as claimed in claim 5, wherein said boost signal conditioning circuit and said real-time voltage signal conditioning circuit each comprise a first operational amplifier, a first clamping diode and a first filter capacitor; the non-inverting input end of the first operational amplifier is connected with a lead between the two divider resistors, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the anode of the first clamping diode through the first filter capacitor, and the cathode of the first clamping diode is connected with an external power supply; meanwhile, the output end of the first operational amplifier is connected with the control unit, and circuit signals are converted into digital signals to be fed back to the control unit;
and/or the current signal conditioning circuit comprises a second operational amplifier, a second clamping diode and a second filter capacitor; the non-inverting input end of the second operational amplifier is connected with the output end of the series resistor, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is connected with the anode of the second clamping diode through the second filter capacitor, and the cathode of the second clamping diode is connected with an external power supply; meanwhile, the output end of the second operational amplifier is connected with the control unit, and circuit signals are converted into digital signals to be fed back to the control unit.
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| CN114251503A (en) * | 2021-12-22 | 2022-03-29 | 奇瑞汽车股份有限公司 | Driving circuit of inductive load, and method and device for detecting driving current |
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