CN108471229B - Surge suppression circuit of two independent closed loops - Google Patents
Surge suppression circuit of two independent closed loops Download PDFInfo
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- CN108471229B CN108471229B CN201810413135.9A CN201810413135A CN108471229B CN 108471229 B CN108471229 B CN 108471229B CN 201810413135 A CN201810413135 A CN 201810413135A CN 108471229 B CN108471229 B CN 108471229B
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- voltage
- error amplifier
- hysteresis comparator
- analog switch
- pole double
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Abstract
The invention discloses a surge suppression circuit with double independent closed loops, and aims to solve the problems that an existing circuit is high in production cost, large in occupied size, not beneficial to the fine requirement of an airborne circuit and the like. The technical points of the invention comprise: the circuit comprises a direct-current power supply, an inductor, a capacitor, a field-effect tube, an error amplifier, a single-pole double-throw analog switch and a hysteresis comparator; the output end of the error amplifier is connected with the grid electrode of the field effect transistor and is input to the input end of the hysteresis comparator; a control reference voltage is input to a positive input end of the error amplifier, and a negative input end of the error amplifier is connected with a common end of the single-pole double-throw analog switch; the contact 1 and the contact 2 of the single-pole double-throw analog switch are respectively connected with sampling current and voltage; the output end of the hysteresis loop comparator selects the conduction of the single-pole double-throw analog switch contact according to the voltage output by the error amplifier.
Description
Technical Field
The invention belongs to the technical field of aviation power electronic control, relates to a surge suppression circuit, and particularly relates to a double-independent closed-loop surge suppression circuit.
Background
The power supply equipment of the existing airborne high-power transmitter usually adopts a direct current power supply circuit, wherein, a direct current power supply can be provided by airborne alternating current after rectification and conversion, and an inductor, a capacitor and a field effect tube are connected in series in the power supply circuit. The inductor and the capacitor form a filter, the filter is connected into a direct current power supply through a field effect tube, the rear stage of the filter is connected with a load, and the power supply of the load can be switched on and off through controlled on-off.
In order to adapt to high-power fluctuation of a transmitter during pulse transmission, the capacitance value of a capacitor is usually very large, which causes very large surge current when a field effect transistor is quickly turned on, so that power supply compatibility is poor, and even a fuse is fused. In order to suppress this inrush current, the startup current is usually closed-loop controlled based on negative feedback of the error amplifier configuration current. The technology inputs the information of target current and actual current into an error amplifier, and adjusts the grid voltage of a field effect tube by using the amplified error, thereby realizing the closed-loop control of the current.
Meanwhile, after the load is normally powered, when the power supply generates normal overvoltage transient specified by GJB181 airplane power supply characteristics, the load can bear surge voltage, and the load is easily damaged. In order to suppress this surge voltage, the output voltage is generally closed-loop controlled based on negative feedback of the error amplifier configuration voltage. The technology inputs the information of target voltage and actual voltage into an error amplifier, and adjusts the grid voltage of a field effect tube by using the amplified error, thereby realizing the closed-loop control of the voltage.
In the prior art, in order to simultaneously realize the closed-loop control of the current and the voltage, a group of independent field effect transistors and an error amplifier are respectively used. Due to the fact that devices cannot be shared, the design of the double-independent closed-loop control circuit is high in production cost and large in occupied size, and the requirement for airborne circuit refinement is not facilitated.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems, the surge suppression circuit with double independent closed loops is provided, a field effect tube and an error amplifier can be shared, closed-loop control of starting current and surge voltage is realized, production cost is saved, the occupied size is small, and an airborne power supply circuit is more refined.
The technical scheme adopted by the invention is as follows:
the circuit comprises a direct-current power supply, an inductor, a capacitor, a field-effect tube, an error amplifier, a single-pole double-throw analog switch and a hysteresis comparator; the cathode of the direct current power supply is connected with the source electrode of the field effect transistor and is grounded; the positive electrode of the direct current power supply is connected with the drain electrode of the field effect transistor through the inductor and the capacitor which are connected in series; the output end of the error amplifier is connected with the grid electrode of the field effect transistor and is input to the input end of the hysteresis comparator; a control reference voltage is input to a positive input end of the error amplifier, and a negative input end of the error amplifier is connected with a common end of the single-pole double-throw analog switch; a contact 1 of the single-pole double-throw analog switch is connected with sampling current, and a contact 2 of the single-pole double-throw analog switch is connected with sampling voltage; the output end of the hysteresis loop comparator selects the conduction of the single-pole double-throw analog switch contact according to the voltage output by the error amplifier.
Further, the field effect transistor is an N-channel enhanced power MOS transistor.
Further, the sampling current is a charging current of the capacitor, and the sampling voltage is a voltage of the capacitor.
Further, a comparison value with a certain interval is preset on the hysteresis comparator, and when the voltage input to the input end of the hysteresis comparator by the error amplifier is smaller than a lower comparison value preset on the hysteresis comparator, the output end of the hysteresis comparator conducts the contact 1 of the single-pole double-throw analog switch to form closed-loop control of the starting current.
Further, a comparison value with a certain interval is preset on the hysteresis comparator, and when the voltage input to the input end of the hysteresis comparator by the error amplifier is greater than the preset upper comparison value on the hysteresis comparator, the output end of the hysteresis comparator conducts the contact 2 of the single-pole double-throw analog switch, so that the closed-loop control of the surge voltage is formed.
Further, the inductor and the capacitor connected in series form a filter for filtering the surge suppression circuit.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention designs a double independent closed-loop control circuit for starting current and surge voltage, and effectively realizes the inhibiting function of the surge current and the surge voltage by sharing the same group of independent field effect transistors and error amplifiers. Because the internal resistance of the field effect transistor is smaller, the power loss in stable working is effectively reduced, and the protection effect of short-circuit load is also achieved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a surge suppression circuit of the present invention with dual independent closed loops;
FIG. 2 is a waveform diagram showing a simulated surge suppression circuit with dual independent closed loops according to the present invention;
the labels in the figure are:
vdc is a direct current power supply; l is an inductance; c is a capacitance; q is a field effect transistor; u is an error amplifier; vref is a control reference voltage; k is a single-pole double-throw analog switch; 1 is a single-pole double-throw analog switch contact 1; 2 is a single-pole double-throw analog switch contact 2; com is a hysteresis comparator; i is the sampling current; v is the sampled voltage.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1:
the invention provides a surge suppression circuit with double independent closed loops, and a preferred embodiment of the surge suppression circuit is shown in figure 1. The circuit comprises a direct-current power supply Vdc, an inductor L, a capacitor C, a field effect transistor Q, an error amplifier U, a single-pole double-throw analog switch K and a hysteresis comparator Com; the negative electrode of the direct-current power supply Vdc is connected with the source electrode of the field effect transistor Q and is grounded; the positive electrode of the direct-current power supply Vdc is connected with the drain electrode of the field-effect tube Q through the inductor L and the capacitor C which are connected in series; the output end of the error amplifier U is connected with the grid electrode of the field effect transistor Q and is input to the input end of the hysteresis comparator Com; a positive input end of the error amplifier U is connected with a common end of the single-pole double-throw analog switch K; a contact 1 of the single-pole double-throw analog switch K is connected with a sampling current i, and a contact 2 of the single-pole double-throw analog switch K is connected with a sampling voltage v; the output end of the hysteresis comparator Com selects the conduction of the contact of the single-pole double-throw analog switch K according to the voltage output by the error amplifier U;
the sampling current is the charging current of the capacitor, and the sampling voltage is the voltage of the capacitor; a comparison value with a certain interval is preset on the hysteresis comparator Com, and when the voltage input to the input end of the hysteresis comparator Com by the error amplifier U is smaller than a lower comparison value preset on the hysteresis comparator Com, the output end of the hysteresis comparator Com conducts the contact 1 of the single-pole double-throw analog switch K to form closed-loop control of the starting current; when the voltage input to the input end of the hysteresis comparator Com by the error amplifier U is greater than an upper comparison value preset on the hysteresis comparator Com, the output end of the hysteresis comparator Com conducts the contact 2 of the single-pole double-throw analog switch K, so that the closed-loop control of the surge voltage is formed. The field effect transistor Q is an N-channel enhanced power MOS transistor; the inductor L and the capacitor C which are connected in series form a filter which is used for filtering the surge suppression circuit.
The surge suppression circuit is provided with a double independent closed-loop control circuit for starting current and surge voltage, and the suppression function of the surge current and the surge voltage is effectively realized by sharing the same group of independent field effect transistors Q and the error amplifier U. Because the internal resistance of the field effect transistor Q is smaller, the power loss in stable working is effectively reduced, the protection effect of a short-circuit load is also achieved, meanwhile, compared with the prior art, the protection device is simpler and more effective, the production cost is reduced, the occupied size is small, and an airborne power supply circuit is more refined.
Example 2:
this embodiment is based on the preferred embodiment described in embodiment 1 and further illustrates the practical application of the circuit of the present invention.
On the basis of embodiment 1 of the present invention, the following specific parameter configurations are performed:
1) the rated voltage of the direct current power supply Vdc is 270V, and the surge voltage is 440V/100 ms;
2) the capacitance value of the capacitor C is 2000uF, the starting charging current is 2A, and the output inhibition voltage is 330V;
3) controlling the reference voltage Vref to be 5V, the corresponding current detection coefficient to be 5V/2A, and the voltage detection coefficient to be 5V/330V;
4) the lower threshold value of the hysteresis comparator Com is 2V, and the upper threshold value is 6V.
In one embodiment of the present invention, the surge suppression circuit of the present invention operates as follows:
1) in the start-up phase, the output voltage of the error amplifier U is lower than the lower comparison value preset on the hysteresis comparator Com. At this time, the hysteresis comparator Com outputs a low level, and the contact 1 of the single-pole double-throw analog switch K is connected to the error amplifier U, thereby forming a closed-loop control of the starting current. At this stage, the control circuit controls the field effect transistor Q to work in a linear region, so that the direct current power supply Vdc charges the capacitor C at a constant current.
2) When the voltage of the capacitor C is gradually charged, the charging current is also gradually reduced, and the output voltage of the error amplifier U is higher than the upper comparison value preset on the hysteresis comparator Com. At this time, the field effect transistor Q is switched from a linear operating state to a saturated conducting state, and simultaneously, the output of the hysteresis comparator Com is switched to a high level to control the contact 2 of the single-pole double-throw analog switch K to be connected to the error amplifier U, thereby forming the closed-loop control of the surge voltage. At this stage, when the dc power supply Vdc generates an overvoltage surge, the output of the error amplifier U is rapidly decreased, so that the fet Q is moved from the saturation region to the linear region, and receives an extra voltage, thereby suppressing the voltage rise of the capacitor C. The reduced output of the error amplifier U is still greater than the lower comparison value of the hysteresis comparator Com, and therefore does not cause switching of the analog switch.
3) When the power supply of the direct-current power supply Vdc is interrupted or an external control signal turns off the switch of the field-effect tube Q, the capacitor C is discharged and reduced through a load, so that the voltage of the contact 2 of the single-pole double-throw analog switch K is reduced, the output of the hysteresis comparator Com is triggered to turn over, and the single-pole double-throw analog switch K is reset to the current closed-loop feedback state of the contact 1, so that the initial state is recovered.
It can be seen that the two stages 1) and 2) above respectively complete the closed-loop control of the starting current and the surge voltage, and the same group of field effect tube Q and the error amplifier U are utilized to realize the surge suppression function of the double independent closed loops.
In one embodiment of the present invention, a simulated waveform diagram of the surge suppression circuit of the present invention is shown in fig. 2. It can be seen that, during current closed-loop control, the capacitor voltage linearly rises in the constant-current charging region; during voltage closed-loop control, the capacitor voltage is stabilized at the suppression voltage amplitude in the voltage suppression area.
As can be seen from the figure, the double independent closed-loop surge suppression circuit independently realizes the starting current closed-loop control and the surge voltage closed-loop control, and can effectively suppress the surge of current and voltage.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. A surge suppression circuit of two independent closed loops, its characterized in that: the circuit comprises a direct-current power supply, an inductor, a capacitor, a field-effect tube, an error amplifier, a single-pole double-throw analog switch and a hysteresis comparator; the cathode of the direct current power supply is connected with the source electrode of the field effect transistor and is grounded; the positive electrode of the direct current power supply is connected with the drain electrode of the field effect transistor through the inductor and the capacitor which are connected in series; the output end of the error amplifier is connected with the grid electrode of the field effect transistor and is input to the input end of the hysteresis comparator; a control reference voltage is input to a positive input end of the error amplifier, and a negative input end of the error amplifier is connected with a common end of the single-pole double-throw analog switch; a contact 1 of the single-pole double-throw analog switch is connected with sampling current, and a contact 2 of the single-pole double-throw analog switch is connected with sampling voltage; the output end of the hysteresis comparator selects the conduction of the single-pole double-throw analog switch contact according to the voltage output by the error amplifier;
a comparison value with a certain interval is preset on the hysteresis comparator, and when the voltage input to the input end of the hysteresis comparator by the error amplifier is smaller than a lower comparison value preset on the hysteresis comparator, the output end of the hysteresis comparator conducts the contact 1 of the single-pole double-throw analog switch to form closed-loop control of the starting current.
2. The surge suppression circuit of claim 1, wherein: the field effect transistor is an N-channel enhanced power MOS transistor.
3. The surge suppression circuit of claim 1, wherein: the sampling current is the charging current of the capacitor, and the sampling voltage is the voltage of the capacitor.
4. The surge suppression circuit of claim 1, wherein: a comparison value with a certain interval is preset on the hysteresis comparator, and when the voltage input to the input end of the hysteresis comparator by the error amplifier is greater than the upper comparison value preset on the hysteresis comparator, the output end of the hysteresis comparator conducts the contact 2 of the single-pole double-throw analog switch to form the closed-loop control of the surge voltage.
5. The surge suppression circuit of claim 1, wherein: the inductor and the capacitor which are connected in series form a filter which is used for filtering the surge suppression circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810413135.9A CN108471229B (en) | 2018-05-03 | 2018-05-03 | Surge suppression circuit of two independent closed loops |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810413135.9A CN108471229B (en) | 2018-05-03 | 2018-05-03 | Surge suppression circuit of two independent closed loops |
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| Publication Number | Publication Date |
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| CN108471229A CN108471229A (en) | 2018-08-31 |
| CN108471229B true CN108471229B (en) | 2020-05-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201797293U (en) * | 2010-08-31 | 2011-04-13 | 航天科工惯性技术有限公司 | Anti-surge protection circuit for aviation direct current power supply |
| CN102315043A (en) * | 2011-09-09 | 2012-01-11 | 福州大学 | Double-closed-loop feedback-control module |
| CN104754800A (en) * | 2013-12-27 | 2015-07-01 | 欧普照明股份有限公司 | Device for controlling input surge current of LED module |
| CN107104593A (en) * | 2017-05-16 | 2017-08-29 | 湖南拓天节能控制技术股份有限公司 | The shared integral term PID double-closed-loop control devices of PWM count word power supply |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9913330B2 (en) * | 2012-06-15 | 2018-03-06 | Lightel Technologies, Inc. | Solid-state lighting operable with compact fluorescent ballasts and AC mains |
| US9812951B2 (en) * | 2015-05-21 | 2017-11-07 | Pacific Power Source, Inc. | Advanced PFC voltage controller |
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2018
- 2018-05-03 CN CN201810413135.9A patent/CN108471229B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201797293U (en) * | 2010-08-31 | 2011-04-13 | 航天科工惯性技术有限公司 | Anti-surge protection circuit for aviation direct current power supply |
| CN102315043A (en) * | 2011-09-09 | 2012-01-11 | 福州大学 | Double-closed-loop feedback-control module |
| CN104754800A (en) * | 2013-12-27 | 2015-07-01 | 欧普照明股份有限公司 | Device for controlling input surge current of LED module |
| CN107104593A (en) * | 2017-05-16 | 2017-08-29 | 湖南拓天节能控制技术股份有限公司 | The shared integral term PID double-closed-loop control devices of PWM count word power supply |
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| CN108471229A (en) | 2018-08-31 |
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