CN112532045A - Active interference suppression method - Google Patents
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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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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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Abstract
The invention discloses an active interference suppression method, which belongs to the field of direct current power supplies and adopts a three-stage cascade processing mode, wherein a front stage is an LC filter circuit, an intermediate stage comprises an adjustable current source and a feedback control loop, and a rear stage is an active booster circuit. The invention adopts the switch type active constant current source noise suppression circuit, converts low-frequency strong transient interference load with larger interference into constant current source characteristic load by using the adjustable current source, and converts the load with pulse change into the load with constant average power, thereby reducing the influence of the load interference source on the input power supply, effectively improving the suppression capability of the power supply on noise signals under high-power pulse load, and having higher application value in occasions with higher requirements on power supply output ripples.
Description
Technical Field
The invention belongs to the field of direct-current power supplies, and particularly relates to an active interference suppression method.
Background
In the field of direct current power supply, ripples and noises have serious influence on the work of noise sensitive circuits such as weak signal detection, radio frequency amplifiers and A/D conversion, the ripples and the noises of a power supply are reduced as much as possible when the power supply is designed, and meanwhile, a load also has great influence on the ripples and the noises of the power supply, for example, the load is a circuit such as a direct current fan, a servo motor and a high-power switching converter. The load with rapid change or large pulsation component can cause the original pure power supply to generate transient deviation, so that new voltage fluctuation and frequency stray occur in the power supply, the ripple and the noise of the power supply are obviously increased, and the work of a noise sensitive circuit is further influenced. Therefore, it is also becoming more and more important to effectively suppress the interference of high power pulses and transient loads to the power supply.
The traditional interference suppression adopts an LC low-pass filter and a linear voltage stabilization mode. The LC low-pass filter method utilizes an inductor and a capacitor to form a frequency selection circuit, allows useful signals below a cut-off frequency to pass through, and blocks or attenuates interference above the cut-off frequency, so that the method is effective in processing high-frequency interference. And the interference frequency of strong transient interference loads such as a direct current fan, a stepping motor and the like is generally in a range of 10Hz to 400Hz, an LC low-pass filter is adopted to suppress the interference, the cut-off frequency of the filter is very low, and the parameter values required by a filter inductance and a capacitor element are large, so that the size of the filter is large, and the requirement of miniaturization cannot be met. In addition, the resistance and dielectric loss of the filter are not favorable for high power processing, so that the LC low-pass filter is used for filtering the interference in the power supply, and the effect is limited. The linear voltage stabilization mode is adopted to inhibit interference, and the linear voltage stabilization method has the advantages of high noise suppression ratio, high response speed and the like, but because the conversion efficiency is low, when the load current change rate is high, the output voltage lags behind the change of the load current due to the limitation of the gain bandwidth and the slew rate, the overshoot phenomenon and the short-term oscillation phenomenon of the output voltage are easily generated, and the effective inhibition of the interference under the condition of high-power load cannot be realized. In order to effectively suppress the interference of a high-power pulse load on a power supply, a new method is needed to convert a load with a pulsating change into a load with constant average power, reduce the influence of a load interference source on an input power supply, and improve the circuit interference suppression capability.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an active interference suppression method, which adopts a switch-type active constant current source noise suppression circuit, converts a low-frequency strong transient interference load with larger interference into a constant current source characteristic load by using an adjustable current source, and converts a load with pulse change into a load with constant average power, thereby reducing the influence of a load interference source on an input power supply and effectively improving the suppression capability of the power supply on noise signals under high-power pulse load.
In order to achieve the purpose, the invention adopts the following technical scheme:
an active interference suppression method adopts a three-stage cascade circuit, which comprises a front stage, an intermediate stage and a rear stage; wherein,
the front stage is an LC filter circuit which is connected with a power Vin and an input end of an adjustable current source;
the middle stage is an active suppression circuit, adopts a switch type adjustable current source mode, comprises an adjustable current source and a feedback control loop, and is connected with the output end of the LC filter and the input end of the rear-stage voltage stabilizer;
the rear stage is an active booster circuit which is connected with the output end of the adjustable current source and the load;
aiming at the interference of the high-power pulse load on a power supply, a switch-type adjustable current source mode is adopted to smooth the high-power pulse load into a load with constant current or constant average power, the interference of a transient load on the power supply is reduced, and then the bus voltage Vbus is increased to the required voltage level according to the requirement of the load voltage.
Preferably, the LC filter circuit employs a simple passive circuit to suppress high-frequency ripple noise generated by the load.
Preferably, the adjustable current source provides a voltage output and a current output based on the power output of the power source; the feedback control loop is connected to the output end of the adjustable current source, compares the voltage output with the reference voltage, provides an error value for the adjustable current source, and adjusts the constant current output.
Preferably, the adjustable constant current source circuit converts a pulse load into a load form of constant average current and fixed output voltage, and converts a load with pulse change into a load with constant average power.
Preferably, in the active BOOST circuit, the BOOST voltage regulator adopts a switch type BOOST circuit.
Preferably, the first and second electrodes are formed of a metal,
the LC filter circuit consists of a small-parameter filter inductance element L1 and a capacitor C1;
the active suppression circuit is characterized in that an adjustable current source and a feedback control loop are constructed by a synchronous buck DC/DC controller TPS62110(N1) and a peripheral circuit, the peripheral circuit comprises an inductive element L2, resistors R1-R3, R5 and R6, capacitors C2, C4, C7 and C8, the switching frequency of a TPS62110(N1) chip is set to be 1MHz, and voltage and current references are integrated inside;
the active BOOST circuit constitutes a BOOST converter by a switch controller LM2733YMF (N2) and a peripheral circuit, the peripheral circuit including an inductance element L3, resistors R4 and R7, capacitors C5 and C6, and the switching frequency of the LM2733YMF (N2) chip is set to 0.6 MHz.
The invention has the following beneficial technical effects:
the active interference suppression circuit is adopted, the front stage is an LC low-pass filter, a simple passive circuit is adopted, high-frequency ripple noise generated by a load can be suppressed, and because the cut-off frequency of the filter is higher, filter inductance and capacitance elements with smaller parameters can be adopted, the requirement of miniaturization can be favorably realized; the middle stage is an active suppression circuit, and a switching type adjustable current source mode is adopted, so that the load characteristic of the pulsation change can be converted into a load with constant average power, the interference of a high-power pulse load on a power supply, particularly a strong interference component of a medium-low frequency band, can be effectively reduced, and the circuit can keep higher conversion efficiency; the rear stage is an active booster circuit, and can convert the output voltage into normal voltage required by the load to ensure the normal work of the load. Therefore, the full-band high-efficiency interference suppression effect can be obtained by processing the high and low frequency interference in a targeted manner.
Drawings
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a measured ripple noise when the present invention is directly connected to a power supply;
fig. 4 shows the measured ripple noise when the circuit of the present invention is switched in.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the invention employs an active interference suppression circuit between the power supply and the interfering load. The circuit includes a buck adjustable current source connected to a power supply. The adjustable current source may provide a voltage output and a current output based on the power output of the power source. The feedback control circuit is connected to the output end of the adjustable current source, compares the voltage output with the reference voltage, provides an error value for the adjustable current source, and adjusts the constant current output, so that the pulse load is converted into the load form of constant average current and fixed output voltage through the adjustable constant current source circuit, and the load with pulsating change is converted into the load with constant average power, thereby effectively reducing the overshoot and short-term oscillation phenomena of the output voltage caused by the rapid change of the load current. In order to reduce high-frequency interference, an LC low-pass filter is added at the front stage; in order to ensure the requirement of the load on the power supply voltage, a first-stage active booster circuit is added at the later stage to convert the output voltage to the power supply voltage required by the load, so that the normal work of the load is ensured.
As can be seen from the schematic diagram of the circuit shown in fig. 1, the present invention adopts a three-stage cascade processing mode, and the preceding stage is an LC filter circuit, connected to the power source Vin and the input of the adjustable current source, and used for suppressing the interference noise with higher frequency. Because the circuit structure is simple, and simultaneously because the interference noise of higher frequency components is restrained, the cut-off frequency of the LC low-pass filter can be set to be very high, so that the parameter values of the filter inductance and the capacitor element do not need to be too large, the required volumes of the filter inductance and the capacitor element are small, and the miniaturization design of the circuit is facilitated.
The middle stage is a key part of the invention, is connected with the output of the LC filter and the input of the post-stage voltage stabilizer, and comprises an adjustable current source and a feedback control loop. The adjustable current source provides output current according to load power, the corresponding input end is current Iin1, and the load is isolated from the input power source by the characteristic of larger current source impedance. When the load changes rapidly, the current Iin1 at the input end of the current source fluctuates little, so that the load disturbance of the ripple change is effectively suppressed. The power conversion adopts a switch type BUCK voltage reduction circuit, the control mode is CC/CV, the voltage is regulated to a lower voltage level by utilizing a high-frequency switch conversion mode, and higher conversion efficiency can be realized. The bus voltage Vbus is kept relatively stable using a filter capacitor C1. The feedback control loop compares the output voltage with the reference voltage, obtains an error value after error amplification, controls the conduction time of a switch tube in the adjustable current source and further adjusts the current output. The feedback control loop is controlled by a PID (proportion integration differentiation), is designed into a slow regulation system for balancing, and can convert a load with pulse change into a load with constant current and constant average power on the premise of allowing the bus voltage Vbus to have transient to a certain extent. Therefore, the high-power pulse load is smoothed into a load with constant current or constant average power through the adjustable current source, and the interference of the high-power pulse and the transient load on the front-end power supply can be effectively reduced.
The rear stage is a boost voltage stabilizer, is connected with the output of the adjustable current source and the load, and boosts the bus voltage Vbus to a required voltage level according to the requirement of the load voltage. In order to improve the conversion efficiency, a switch type BOOST circuit is adopted, and the stable output voltage is obtained by utilizing the adaptability of the BOOST circuit to the input voltage, so that the adverse effect caused by transient on the intermediate-stage bus voltage Vbus is eliminated, and the normal work of a load circuit is ensured.
Fig. 2 is a schematic diagram of an embodiment of the present invention, in which a front-end power supply is +12V, a load is a 12V/0.7A dc fan, a current surge amplitude is 2A during a commutation switching period, and a commutation frequency is 210 Hz. The front stage is a low-pass filter consisting of L1 and C1, the cut-off frequency of 3dB is designed to be 100Hz, and high-frequency interference can be effectively inhibited. In order to reduce the size of the whole circuit and prevent the inductor core from being unsaturated when a larger current is passed, a small packaged chip inductor element can be used for a small inductance value, and the L1 inductance value is 10uH, so that the capacitance value of the filter capacitor C1 is determined. The middle stage adopts a synchronous buck DC/DC controller TPS62110(N1) and a peripheral circuit to construct an adjustable current source and a feedback control loop, the switching frequency of a chip is 1MHz, voltage and current references are integrated inside, good CC/CV loop control can be realized, the voltage is adjusted to +9V from +12V by the circuit, transient current is balanced, the loop bandwidth is designed to be 50Hz, and pulse load can be effectively smoothed. The BOOST converter is formed by a switch controller LM2733YMF (N2) and a peripheral circuit in the rear stage, the switching frequency of a chip is 0.6MHz, the voltage is increased to +12V from +9V, and the normal work of a load fan is ensured.
In order to verify the interference suppression effect, the fan load is directly connected with the power supply and is compared with the test data accessed into the circuit, the test fan load is directly connected with the power supply, the dissipation power is 8.1W, the dissipation power is 8.8W after the circuit is accessed, the conversion efficiency is up to 92%, and the higher conversion efficiency can be obtained by adopting a switch conversion mode. Fig. 3 shows the ripple noise measured when the fan load is directly connected to the power supply, and fig. 4 shows the ripple noise measured when the circuit of the present invention is connected, as can be seen from the figure, the ripple noise of the power supply is 500mV when the interference suppression circuit is not provided, and the index is poor; when the interference suppression circuit is connected, the power supply ripple noise is less than 10mV, and the interference suppression effect is obvious.
The invention adopts a switch type adjustable current source mode to smooth the high-power pulse load into the load with constant current or constant average power aiming at the interference of the high-power pulse load on the power supply, can effectively reduce the interference of transient load on the power supply, enables the circuit to keep higher conversion efficiency, and has higher application value in occasions with higher requirements on power supply output ripples.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. An active interference suppression method is characterized in that a three-stage cascade circuit is adopted, and the three-stage cascade circuit comprises a front stage, an intermediate stage and a rear stage; wherein,
the front stage is an LC filter circuit which is connected with a power Vin and an input end of an adjustable current source;
the middle stage is an active suppression circuit, adopts a switch type adjustable current source mode, comprises an adjustable current source and a feedback control loop, and is connected with the output end of the LC filter and the input end of the rear-stage voltage stabilizer;
the rear stage is an active booster circuit which is connected with the output end of the adjustable current source and the load;
aiming at the interference of the high-power pulse load on a power supply, a switch-type adjustable current source mode is adopted to smooth the high-power pulse load into a load with constant current or constant average power, the interference of a transient load on the power supply is reduced, and then the bus voltage Vbus is increased to the required voltage level according to the requirement of the load voltage.
2. The active interference suppression method according to claim 1, wherein the LC filter circuit employs a simple passive circuit to suppress high-frequency ripple noise generated by the load.
3. The active interference mitigation method of claim 1, wherein the adjustable current source provides a voltage output and a current output based on a power output of the power source; the feedback control loop is connected to the output end of the adjustable current source, compares the voltage output with the reference voltage, provides an error value for the adjustable current source, and adjusts the constant current output.
4. The active interference suppression method of claim 3, wherein the adjustable constant current source circuit converts a pulse load into a load form of constant average current and fixed output voltage, and converts a pulsating load into a load of constant average power.
5. The active interference suppression method of claim 1, wherein in the active BOOST circuit, the BOOST regulator employs a switch-type BOOST circuit.
6. The active interference suppression method according to claim 1,
the LC filter circuit consists of a small-parameter filter inductance element L1 and a capacitor C1;
the active suppression circuit is characterized in that an adjustable current source and a feedback control loop are constructed by a synchronous buck DC/DC controller TPS62110(N1) and a peripheral circuit, the peripheral circuit comprises an inductive element L2, resistors R1-R3, R5 and R6, capacitors C2, C4, C7 and C8, the switching frequency of a TPS62110(N1) chip is set to be 1MHz, and voltage and current references are integrated inside;
the active BOOST circuit constitutes a BOOST converter by a switch controller LM2733YMF (N2) and a peripheral circuit, the peripheral circuit including an inductance element L3, resistors R4 and R7, capacitors C5 and C6, and the switching frequency of the LM2733YMF (N2) chip is set to 0.6 MHz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114545839A (en) * | 2022-03-08 | 2022-05-27 | 大唐青岛西海岸热力有限公司 | Intelligent control system and control method for thermal equipment |
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