CN113271024B - AC/DC converter for low-power microcircuit system - Google Patents
AC/DC converter for low-power microcircuit system Download PDFInfo
- Publication number
- CN113271024B CN113271024B CN202110719158.4A CN202110719158A CN113271024B CN 113271024 B CN113271024 B CN 113271024B CN 202110719158 A CN202110719158 A CN 202110719158A CN 113271024 B CN113271024 B CN 113271024B
- Authority
- CN
- China
- Prior art keywords
- circuit
- feedback
- converter
- output
- feedback branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 101100491259 Oryza sativa subsp. japonica AP2-2 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides an AC/DC converter for a low-power microcircuit system, which comprises an input circuit, a conversion circuit, an output circuit, a sampling circuit power factor correction circuit, a feedback circuit, a front control circuit, a first protection circuit and a second protection circuit, wherein the input circuit is connected with the conversion circuit; the first protection circuit is connected with the input circuit, and the second protection circuit is connected with the output circuit and the feedback circuit; the feedback circuit comprises a first feedback branch and a second feedback branch; the first feedback branch is connected with the first protection circuit, and the second feedback branch is connected with the second protection circuit; the front control circuit is connected with the input circuit and the conversion circuit. The power factor correction circuit is connected with the output circuit and is used for detecting the power of the load equipment connected with the output circuit so as to correct the output voltage detected by the second protection circuit. The converter of the invention adopts the matching of the multiple protection circuits and various feedback circuits, so that the output voltage can be stable and the working safety of the converter can be ensured.
Description
Technical Field
The invention belongs to the technical field of microcircuits, and particularly relates to an AC/DC converter for a low-power microcircuit system.
Background
The AC/DC converter is also called an AC/DC switching power supply or an AC/DC switching circuit, converter, conversion circuit, etc., and is hereinafter referred to as a switching power supply.
The switching power supply is a power electronic device which is widely applied in the fields of small consumer electronics such as mobile phones and MP3, large aerospace and the like. This is because the electronic system requires a power supply system to supply energy. Most of the electric energy in daily life comes from the mains (high-voltage alternating current). However, the electronic systems have different requirements on power supplies, such as the current small electronic systems often require a low-voltage dc power supply of 1V to 5V. Therefore, the utility power is generally converted to be suitable for use in an electronic system, such as by an AC/DC converter.
In AC/DC applications, a high voltage AC voltage is converted to a lower voltage DC voltage by switches, inductors, capacitors, and the like. In AC/DC applications, therefore, voltages of several tens of volts are often involved. Such voltages still fall into the high voltage-high power category in modern electronic devices. Therefore, how to design a stable AC/DC converter applicable to a low-power microcircuit system becomes one of the technical problems of various manufacturers in the field of microcircuits.
The Chinese patent application with application number CN202011585678.2 provides an input current harmonic suppression method of a three-level AC/DC power supply, which comprises the following steps: extracting a harmonic signal of a certain time by using a mathematical method; step 2: reconstructing the harmonic wave from the detected amplitude and phase information of the harmonic wave signal; and step 3: and the subharmonic is suppressed by a negative feedback loop. The method can detect the harmonic wave very accurately without additional hardware equipment, so the method is simple, robust and easy to implement.
The Chinese invention patent application with the application number of CN202110112468.X provides a wide-voltage non-isolated AC-DC constant-current driver and LED lighting equipment, wherein the wide-voltage non-isolated AC-DC constant-current driver comprises a non-isolated PFC main converter, a PFC controller, a DC-DC auxiliary converter and a DC-DC controller; the non-isolated PFC main converter comprises a main conversion module and a main output port, wherein the main conversion module comprises a main output module and an auxiliary output module; the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the PFC controller comprises a main feedback port; the DC-DC controller comprises an auxiliary feedback port; the main output port and the auxiliary output port are connected in series to form a total output port. The auxiliary voltage of the auxiliary output module is controlled to be a fixed value in a closed-loop mode, the total current of the total output port is controlled to be a fixed value in a closed-loop mode, and the PFC controller can adjust the main voltage to enable the total voltage range to be wider when the total current is kept constant.
However, the inventor finds that the existing AC/DC converter still has great defects in safety protection and feedback control, especially in the application of a low-power microcircuit, and the existing AC/DC converter cannot adapt to the power change requirement and cannot output stable low voltage.
Disclosure of Invention
In order to solve the technical problem, the invention provides an AC/DC converter for a low-power microcircuit system, which comprises an input circuit, a conversion circuit, an output circuit, a sampling circuit power factor correction circuit, a feedback circuit, a front control circuit, a first protection circuit and a second protection circuit, wherein the input circuit is connected with the sampling circuit; the first protection circuit is connected with the input circuit, and the second protection circuit is connected with the output circuit and the feedback circuit; the feedback circuit comprises a first feedback branch and a second feedback branch; the first feedback branch is connected with the first protection circuit, and the second feedback branch is connected with the second protection circuit; the front control circuit is connected with the input circuit and the conversion circuit. The power factor correction circuit is connected with the output circuit and is used for detecting the power of the load equipment connected with the output circuit so as to correct the output voltage detected by the second protection circuit. The converter of the invention adopts the matching of the multiple protection circuits and various feedback circuits, so that the output voltage can be stable and the working safety of the converter can be ensured.
Specifically, in the technical solution of the present invention, the conversion circuit includes a transformer and a plurality of switching devices; the output circuit comprises a rectifying circuit and a filter circuit;
the first protection circuit is an over-temperature protection circuit; the over-temperature protection circuit comprises a temperature detection circuit; the temperature detection circuit detects the temperature of the circuit board at the input end of the AC/DC converter, and when the temperature exceeds a preset value, the input circuit is closed.
The second protection circuit is an overvoltage protection circuit, and the overvoltage protection circuit comprises a voltage detection circuit;
the voltage detection circuit detects the output voltage of the AC/DC converter, and when the variation value of the output voltage is higher than a preset range, an early warning signal is sent to the second feedback branch circuit, so that the second control feedback branch circuit adjusts the state of a switching device in the conversion circuit through the front control circuit.
Further, the feedback circuit further comprises a reference source circuit, a bias circuit, a first error amplifier and a second error comparator;
the positive phase input end of the first error amplifier is connected with the reference source circuit; and the inverting input end of the first error amplifier is connected with the output end of the second feedback branch.
And the positive input end of the second error comparator is connected with the reference source circuit, and the negative input end of the second error comparator is connected with the second protection circuit.
The present invention improves the prior art at least in terms of safety protection and feedback control, and is effectively embodied in that a DC low voltage suitable for various low-power-consumption electronic devices can be stably output while ensuring circuit safety.
Further advantages of the invention will be apparent in the detailed description section in conjunction with the drawings attached hereto.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a general AC/DC converter
FIG. 2 is a specific embodiment of an AC/DC converter implemented based on the principle of the structure shown in FIG. 1
FIG. 3 is a schematic diagram of an AC/DC converter for a low power microcircuit system in accordance with one embodiment of the present invention
FIG. 4 is a specific embodiment of an AC/DC converter implemented based on the principle of the structure shown in FIG. 3
FIG. 5 is a partial structural schematic diagram of a feedback circuit used in the AC/DC converter shown in FIG. 4, and FIGS. 6 to 7 are partial structural schematic diagrams of a protection circuit used in the AC/DC converter shown in FIG. 4
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Before describing the various embodiments, a basic concept related to a switching power supply will be described to facilitate a better understanding of the improvements of the related art and the present invention.
The switch power supply is a power supply which utilizes the modern power electronic technology to control the on-off of a power tube and adjust the on-off time ratio of the power tube according to a feedback signal so as to keep the output stable.
According to the control mode, the switching power supply realizes stable output mainly by adjusting the conduction duty ratio of the power MOS. And the duty cycle can be adjusted in the following two ways:
pulse Width Modulation (PWM): the switching frequency of the switching tube is kept unchanged, and the duty ratio is adjusted by changing the conduction time, so that the purpose of stabilizing the output is achieved.
Pulse Frequency Modulation (PFM): the on-time of the switching tube is kept unchanged, and the duty ratio is adjusted by changing the switching frequency, so that the purpose of stabilizing the output is achieved.
In practical applications, since the switching frequency of the PFM mode is varied, which increases the design difficulty of the filter circuit, the PWM mode is the preferred control mode of the switching power supply.
Fig. 1 is a schematic diagram of a structural principle of a typical switching power supply. It can be seen that the power amplifier mainly comprises an EMI filter circuit, a rectifying/filtering circuit, a power conversion circuit, a feedback circuit, a PWM controller circuit, a PFC circuit and the like.
In fig. 1, an input end converts alternating current into direct current through a rectifying circuit, and under the action of an excitation pulse on a power switching tube, a high-frequency pulse current is generated by turning on and off the power switching tube (i.e., a switching device) at high speed, and then stable direct current is output through a high-frequency transformer.
A typical switching power supply as described in figure 2 can be designed based on the principles described in figure 1.
In fig. 2, the switching transistor Tr is driven by a control voltage of a pulse width modulation circuit, and a dc voltage is changed to an ac pulse voltage and applied to a high frequency transformer. The pulse voltage is transformed by a transformer, and then transformed into a direct current voltage through a rectifier and a smoothing circuit of a secondary circuit, and the direct current voltage is used as the output voltage of the switching power supply. In this case, the smoothing circuit averages the secondary voltage during the forward period of the transformer, and obtains an output voltage proportional to the average value of the voltage integral over one period by this action.
The feedback amplifier A compares the output voltage with a reference voltage to generate an error signal, which is applied to a photodiode in the optocoupler. The output of the feedback amplifier A is received by the pulse width modulation circuit through the isolation of the optical coupler (PC), and when the output voltage becomes high, the pulse width of the pulse width modulation circuit becomes narrow; conversely, the pulse width becomes wider. Thus, the switching transistor (Tr) is driven by the controlled pulse width, and a pulse proportional to the pulse width is applied to the high frequency transformer to control the output voltage to be stable.
The following embodiments of the present invention will not depart from the principle of fig. 1 or fig. 2 (in fact, almost all AC-DC processes do not depart from the above principle), and besides the technical solutions (technical means and technical features) specifically indicated by the present invention, other modules or components used in the present invention but not developed can adopt the principle or structure described in fig. 1 or fig. 2.
However, in practical applications, the structure illustrated in fig. 2 still has drawbacks as mentioned in the applicant's background art, and therefore, further improvements are needed.
As a first modification in fig. 1 or fig. 2, fig. 3 is a schematic diagram of a structure of an AC/DC converter for a low-power microcircuit system according to an embodiment of the present invention.
In fig. 3, the AC/DC converter includes an input circuit, a conversion circuit, an output circuit, and a feedback circuit.
As a refinement, the AC/DC converter further includes a first protection circuit and a second protection circuit;
the first protection circuit is connected with the input circuit, and the second protection circuit is connected with the output circuit and the feedback circuit.
As a further improved part, on the basis of fig. 3, further reference is made to fig. 4.
Of course, in fig. 4, portions corresponding to fig. 1 to 2, for example, the conversion circuit includes a transformer and a plurality of switching devices; the output circuit comprises a rectifying circuit and a filtering circuit.
As a further improvement, the AC/DC converter further includes a pre-control circuit; the feedback circuit comprises a first feedback branch and a second feedback branch; the first feedback branch is connected with the first protection circuit, and the second feedback branch is connected with the second protection circuit; the prepositive control circuit is connected with the input circuit and the conversion circuit.
More specifically, as a more improved specific embodiment, the feedback circuit further includes a reference source circuit and a bias circuit;
the prepositive control circuit is connected to the first feedback branch and the second feedback branch through the reference source circuit;
the input end of the first feedback branch is connected with the output end of the second feedback branch through the bias circuit.
In fig. 4, the bias circuit provides bias feedback signals to the first feedback branch and the second feedback branch.
The reference source circuit comprises a starting circuit and a sub-threshold current generating circuit;
the starting circuit is connected with the front-end control circuit, the sub-threshold current generating circuit obtains the bias feedback signal generated by the bias branch circuit from the feedback branch circuit, and the output sub-threshold current is used as the input signal of the front-end control circuit.
Although not shown, as a further supplementary improvement, the feedback circuit further includes a sampling circuit; the sampling circuit is connected with the second protection circuit and the feedback branch circuit.
Although not shown, as a further supplementary improvement, the feedback circuit further includes a sampling circuit power factor correction circuit;
the power factor correction circuit is connected with the output circuit and is used for detecting the power of load equipment connected with the output circuit and correcting the output voltage detected by the second protection circuit based on the detected power.
Obviously, the further improvement scheme can adapt to different output equipment loads, thereby enabling the output voltage to be adaptively adjusted.
Referring next to fig. 5, fig. 5 is a schematic diagram of a portion of a feedback circuit for use with the AC/DC converter of fig. 4.
Different from the single-path output feedback in the prior art, the embodiment of the invention adopts multiple feedback branches, and different feedback branches are communicated by adopting a bias circuit and are simultaneously connected to the same reference power supply circuit.
As mentioned above, the feedback circuit further comprises a reference source circuit and a bias circuit, and the pre-control circuit is connected to the first feedback branch and the second feedback branch through the reference source circuit; and the input end of the first feedback branch is connected with the output end of the second feedback branch through the bias circuit.
More specifically, referring to fig. 5, the feedback circuit includes an error amplifier; the first feedback branch comprises a first error amplifier, and the non-inverting input end of the first error amplifier is connected with the reference source circuit; and the inverting input end of the first error amplifier is connected with the output end of the second feedback branch.
The feedback circuit comprises an error comparator; the second feedback branch comprises a second error comparator; and the positive input end of the second error comparator is connected with the reference source circuit, and the negative input end of the second error comparator is connected with the second protection circuit.
In fig. 5, the reference source circuit provides a reference signal for the feedback branch and is therefore an important component. However, the present embodiment is further improved in that the reference source circuit includes a start-up circuit and a sub-threshold current generating circuit;
the starting circuit is connected with the preposed control circuit due to the existence of bias and preposed control between two feedback branches, the subthreshold current generating circuit obtains a bias feedback signal generated by the bias branch from the feedback branch and takes the output subthreshold current as an input signal of the preposed control circuit.
Fig. 6-7 further illustrate schematic diagrams of protection circuits used in the present invention.
In the above embodiment, the second protection circuit is an overvoltage protection circuit, and the overvoltage protection circuit includes a voltage detection circuit; the voltage detection circuit detects the output voltage of the AC/DC converter, and when the variation value of the output voltage is higher than a preset range, an early warning signal is sent to the second feedback branch circuit, so that the second control feedback branch circuit adjusts the state of a switching device in the conversion circuit through the front control circuit.
The first protection circuit is an over-temperature protection circuit; the over-temperature protection circuit comprises a temperature detection circuit; the temperature detection circuit detects the temperature of the circuit board at the input end of the AC/DC converter, and when the temperature exceeds a preset value, the input circuit is closed.
Fig. 6 shows an overvoltage protection circuit. When the circuit chip works, some critical voltages are required to be detected. Such as the supply voltage VDD. If the VDD voltage is too high and is higher than the withstanding voltage range of the chip, the chip may be burned out.
The operating principle of the circuit of fig. 6 is described as follows:
when the value of VDD is small, the positive side input of the upper first comparator is less than Vref, so that the voltage at the comparator output is low. UV is low. After going through the reverberator, a high level signal is obtained, and the signal controls the MOS transistor switch MN1 to open. The two resistors I6 and I7 are shorted.
As VDD continues to rise, the positive input of the UV comparator continuously increases, and the output of the comparator jumps from low to high when UV increases to a set value by reasonably setting the resistor voltage division network formed by R1 and R2.
When the output of the comparator is high, the control signal on the MOS switch MN1 is low, and this switch is open, so that R3 and R4 are also connected to the resistor divider network. This causes the voltage to the positive terminal of the UV comparator to be increased.
Fig. 7 shows an over-temperature protection circuit.
The circuit utilizes the PTAT current and the VBE temperature characteristic of the triode to realize temperature detection and output of the over-temperature protection signal OTP. In fig. 7, the VPTAT voltage produces a PTAT current, i.e., IDS1 and IDS are PTAT currents.
In the normal temperature range, the voltage at node a is less than the turn-on voltage VBE (about 0.6V) of the transistor Q1, Q1 is off, OTP is high, and M3 is on to short the resistor R1.
With the increasing temperature and the increasing PTAT current, the voltage of the node A rises (the temperature coefficients of the resistors R1 and R2 can be ignored), the conduction voltage VBE of the triode is reduced continuously, when the temperature rises to about 150 ℃, the triode Q1 is conducted, the node OTP is pulled down to a low level, and meanwhile, the M3 is turned off, so that the R1 and the R2 are connected in series, the voltage of the node A is further raised, and the hysteresis function is realized.
The present invention improves the prior art at least in terms of safety protection and feedback control, etc., as compared to the general principle AC-DC framework of the prior art, and is effectively embodied in that a DC low voltage suitable for various low power consumption electronic devices can be stably output while ensuring circuit safety.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An AC/DC converter for a low power microcircuit system, the AC/DC converter comprising an input circuit, a conversion circuit, an output circuit, and a feedback circuit;
the conversion circuit comprises a transformer and a plurality of switching devices; the output circuit comprises a rectifying circuit and a filter circuit;
the method is characterized in that:
the AC/DC converter further comprises a pre-control circuit, a first protection circuit and a second protection circuit;
the first protection circuit is connected with the input circuit, and the second protection circuit is connected with the output circuit and the feedback circuit;
the feedback circuit comprises a first feedback branch and a second feedback branch;
the first feedback branch is connected with the first protection circuit, and the second feedback branch is connected with the second protection circuit;
the prepositive control circuit is connected with the input circuit and the conversion circuit;
the feedback circuit further comprises a reference source circuit and a bias circuit;
the reference source circuit comprises a starting circuit and a sub-threshold current generating circuit;
the bias circuit provides bias feedback signals for the first feedback branch and the second feedback branch;
the starting circuit is connected with the front-end control circuit, the sub-threshold current generating circuit acquires a bias feedback signal generated by the bias circuit from the feedback branch circuit, and the output sub-threshold current is used as an input signal of the front-end control circuit;
the second protection circuit is an overvoltage protection circuit, and the overvoltage protection circuit comprises a voltage detection circuit;
the voltage detection circuit detects the output voltage of the AC/DC converter, and when the variation value of the output voltage is higher than a preset range, an early warning signal is sent to the second feedback branch circuit, so that the second feedback branch circuit adjusts the state of a switching device in the conversion circuit through the front control circuit.
2. An AC/DC converter for a low power microcircuit system according to claim 1, wherein:
the prepositive control circuit is connected to the first feedback branch and the second feedback branch through the reference source circuit;
the input end of the first feedback branch is connected with the output end of the second feedback branch through the bias circuit.
3. An AC/DC converter for a low power microcircuit system according to claim 1, wherein:
the feedback circuit includes an error amplifier;
the first feedback branch comprises a first error amplifier, and the non-inverting input end of the first error amplifier is connected with the reference source circuit; and the inverting input end of the first error amplifier is connected with the output end of the second feedback branch.
4. An AC/DC converter for a low power microcircuit system according to claim 1, wherein:
the feedback circuit comprises an error comparator;
the second feedback branch comprises a second error comparator;
and the positive input end of the second error comparator is connected with the reference source circuit, and the negative input end of the second error comparator is connected with the second protection circuit.
5. An AC/DC converter for a low power microcircuit system according to claim 1, wherein:
the first protection circuit is an over-temperature protection circuit;
the over-temperature protection circuit comprises a temperature detection circuit;
the temperature detection circuit detects the temperature of the circuit board at the input end of the AC/DC converter, and when the temperature exceeds a preset value, the input circuit is closed.
6. An AC/DC converter for a low-power microcircuit system according to any one of claims 1-5,
the method is characterized in that:
the feedback circuit further comprises a sampling circuit;
the sampling circuit is connected with the second protection circuit and the feedback branch circuit.
7. An AC/DC converter for a low-power microcircuit system according to any of claims 1-5, characterized in that:
the feedback circuit further comprises a power factor correction circuit;
the power factor correction circuit is connected with the output circuit and is used for detecting the power of load equipment connected with the output circuit and correcting the output voltage detected by the second protection circuit based on the detected power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110719158.4A CN113271024B (en) | 2021-06-28 | 2021-06-28 | AC/DC converter for low-power microcircuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110719158.4A CN113271024B (en) | 2021-06-28 | 2021-06-28 | AC/DC converter for low-power microcircuit system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113271024A CN113271024A (en) | 2021-08-17 |
| CN113271024B true CN113271024B (en) | 2022-05-13 |
Family
ID=77236063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110719158.4A Active CN113271024B (en) | 2021-06-28 | 2021-06-28 | AC/DC converter for low-power microcircuit system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113271024B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977113A (en) * | 2022-06-13 | 2022-08-30 | 北京迪赛奇正科技有限公司 | AC-DC converter control method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203788154U (en) * | 2014-04-23 | 2014-08-20 | 深圳市时代创新科技有限公司 | Multipath output DC/DC secondary power supply system |
| CN105183063A (en) * | 2015-09-23 | 2015-12-23 | 成都华微电子科技有限公司 | Low-dropout regulator with broadband high power supply rejection ratio |
| CN112947666A (en) * | 2021-03-02 | 2021-06-11 | 江苏润石科技有限公司 | Linear voltage stabilizer with high power supply rejection ratio and large-current low-noise amplifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7193872B2 (en) * | 2005-01-28 | 2007-03-20 | Kasemsan Siri | Solar array inverter with maximum power tracking |
| CN202652059U (en) * | 2012-06-13 | 2013-01-02 | 杭州士兰微电子股份有限公司 | Power factor correction control circuit and power factor correction device comprising the same |
-
2021
- 2021-06-28 CN CN202110719158.4A patent/CN113271024B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203788154U (en) * | 2014-04-23 | 2014-08-20 | 深圳市时代创新科技有限公司 | Multipath output DC/DC secondary power supply system |
| CN105183063A (en) * | 2015-09-23 | 2015-12-23 | 成都华微电子科技有限公司 | Low-dropout regulator with broadband high power supply rejection ratio |
| CN112947666A (en) * | 2021-03-02 | 2021-06-11 | 江苏润石科技有限公司 | Linear voltage stabilizer with high power supply rejection ratio and large-current low-noise amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113271024A (en) | 2021-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8040117B2 (en) | Closed loop negative feedback system with low frequency modulated gain | |
| US8913404B2 (en) | Constant voltage constant current control circuits and methods with improved load regulation | |
| US8320139B2 (en) | Switching regulator with frequency limitation and method thereof | |
| CN109247042B (en) | AC/DC PFC converter, conversion method and LED driver | |
| US9907130B2 (en) | High-efficiency LED driver and driving method | |
| CN203368317U (en) | High PFC constant current control device without loop compensation and voltage converter | |
| US6946819B2 (en) | Device for the correction of the power factor in power supply units with forced switching operating in transition mode | |
| CN104980009B (en) | Power supply device | |
| CN108631578B (en) | Control unit for switching converter operating in continuous conduction and peak current control mode | |
| CN103312200A (en) | Power converter, current limiting unit, control circuit and related control method | |
| JP6217340B2 (en) | Power supply | |
| US8085007B2 (en) | Switching power supply circuit | |
| US8737099B2 (en) | Controllers for power converters | |
| KR102175887B1 (en) | Pfc control circuit, active pfc circuit and method for controlling pfc | |
| CN103051220B (en) | Switching Power Supply and controller thereof | |
| US11736004B2 (en) | Method and apparatus for reducing EMI for a frequency-modulated DC-DC converter | |
| CN203352469U (en) | Power Converter, Current Limiting Unit and Control Circuit | |
| CN105305805A (en) | Power factor correction device | |
| CN104283430A (en) | Soft start switching power supply conversion device | |
| CN112953199B (en) | Switching power supply controller and control method thereof | |
| CN113271024B (en) | AC/DC converter for low-power microcircuit system | |
| CN112637996A (en) | LED drive circuit and control method | |
| US20220231613A1 (en) | Power supply device and voltage converting method | |
| CN214674895U (en) | Switch linear composite power supply | |
| CN113271019B (en) | Microcircuit DC-DC converter and conversion method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |