CN112968616A - AC-DC converter and AC-DC conversion system - Google Patents
AC-DC converter and AC-DC conversion system Download PDFInfo
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- CN112968616A CN112968616A CN202110189622.3A CN202110189622A CN112968616A CN 112968616 A CN112968616 A CN 112968616A CN 202110189622 A CN202110189622 A CN 202110189622A CN 112968616 A CN112968616 A CN 112968616A
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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
- 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
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- 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
- H02H7/16—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 capacitors
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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
- 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
Abstract
The application relates to the technical field of electronics, and discloses an alternating current-direct current converter and an alternating current-direct current conversion system. The AC-DC converter comprises: the circuit comprises a filter, a rectifier, a capacitor C1, a switch Q1 and a voltage comparison circuit, wherein the rectifier receives alternating current input, the anode of a capacitor C1 is connected to the positive output end of the rectifier, the cathode of a capacitor C1 is connected to a switch Q1, a switch Q1 is connected to the negative output end of the rectifier, and meanwhile, a switch Q1 is grounded; two ends of the capacitor C1 are connected to the input end of the voltage comparison circuit, the voltage comparison circuit inputs the reference voltage, and the output end of the voltage comparison circuit is connected to the switch Q1. While switch Q1 can actively limit the input inrush current. When the ac input is on, switch Q1 prevents excessive current spikes from charging capacitor C1. By detecting the time when the ac voltage crosses zero, the system determines when to charge capacitor C1. The AC-DC converter provided by the application reduces the size of the capacitor, thereby remarkably reducing the size of the AC/DC converter.
Description
Technical Field
The application relates to the technical field of electronics, in particular to an alternating current-direct current converter and an alternating current-direct current conversion system.
Background
The ac-dc converter is used for converting a high-voltage ac voltage into a low-voltage dc voltage, and is widely used in the field of mobile phones and notebooks. Generally, as shown in fig. 1, the DC-DC converter includes a filter 10, a rectifier 1, and a capacitor C1, and is connected to a DC-DC converter 3 for providing a desired output voltage to form a DC-DC conversion system. The filter 10 is used for filtering noise, the rectifier 1 converts the ac voltage into a DC voltage with a large ripple, the capacitor C1 filters the ripple to provide a stable DC output, and the DC-DC converter 3 converts the DC voltage into a voltage level required by the load.
Key performance indicators for ac-dc converters include: size, transmission power and efficiency. In addition, the parasitic resistance of the capacitor with a small capacitance value is too large, so the size of the traditional ac/dc converter is limited by the size of the capacitor; in addition, in the conventional ac-DC converter, the output voltage of the capacitor is proportional to the input ac line voltage, which causes the DC output voltage on the capacitor to become larger when the input ac voltage becomes larger, and the larger DC voltage causes the capacitance of the DC-DC converter to become larger and the efficiency of the converter to decrease.
Disclosure of Invention
In order to solve the problem that the converter efficiency is reduced due to the fact that the size of the alternating current-direct current converter is limited by the size of a capacitor and the capacitance value of the capacitor is large, the application provides the alternating current-direct current converter and the alternating current-direct current conversion system.
On the one hand, the AC-DC converter that this application provided realizes through following technical scheme:
an AC-DC converter, comprising: the circuit comprises a filter, a rectifier, a capacitor C1, a switch Q1 and a voltage comparison circuit, wherein the rectifier receives alternating current input, the anode of the capacitor C1 is connected to the positive output end of the rectifier, the cathode of the capacitor C1 is connected to the switch Q1, the switch Q1 is connected to the negative output end of the rectifier, and meanwhile, the switch Q1 is grounded; two ends of the capacitor C1 are connected to the input end of the voltage comparison circuit, the voltage comparison circuit inputs the reference voltage, and the output end of the voltage comparison circuit is connected to the switch Q1.
By adopting the technical scheme, when the voltage of the capacitor C1 is lower than the reference voltage, the switch is switched on, when the voltage of the capacitor C1 is higher than the reference voltage, the switch is switched off, and only when the voltage of the capacitor C1 is lower than the reference voltage, the capacitor C1 transfers power to the output end, therefore, the capacitance value of the capacitor C1 can be smaller than that of a traditional power adapter, the thickness of the capacitor C1 can be reduced to be smaller than 20mm, therefore, the size of the adapter can be remarkably reduced, the problem that the large-volume capacitor in a power supply occupies a large space is solved, and the size of the converter is limited.
In some embodiments, the voltage comparison circuit includes a differential amplifier and a comparator, the positive electrode of the capacitor C1 is connected to the positive input terminal of the differential amplifier, the negative electrode of the capacitor C1 is connected to the negative input terminal of the differential amplifier, the output terminal of the differential amplifier is connected to the negative input terminal of the comparator, the positive input terminal of the comparator is connected to a reference voltage, and the output of the comparator is connected to the gate of the switch Q1.
In some embodiments, the switch Q1 is a fet, the negative terminal of the capacitor C1 is connected to the drain of the switch Q1, the source of the switch Q1 is connected to the negative output terminal of the rectifier 1, the source of the switch Q1 is also the system ground, and the output of the comparator is connected to the gate of the switch Q1.
By adopting the technical scheme, the rectifier receives alternating current input and outputs direct current voltage to the capacitor C1 and the switch Q1 which are connected in series, the voltage on the capacitor C1 is sampled by the differential amplifier and then is compared with reference voltage through the comparator to control a gate signal of the switch Q1, when the voltage of the capacitor C1 is lower than the reference voltage, the switch is turned on, and when the voltage of the capacitor C1 is higher than the reference voltage, the switch is turned off.
In some embodiments, a surge protection circuit is also included, which is connected between the voltage comparison circuit and the switch Q1.
By adopting the technical scheme, the input surge current can be actively limited, and when the alternating current input is switched in, the switch Q1 prevents an overlarge current spike from charging the capacitor C1.
In some embodiments, the surge protection circuit includes a rectifying unit, a zero-crossing detection circuit, a second timer, an and gate circuit, and a gate driver, wherein an ac input drives the rectifying unit simultaneously, an output of the rectifying unit is connected to a voltage divider, an output of the voltage divider is connected to the zero-crossing detection circuit, the zero-crossing detection circuit is connected to the second timer, the second timer is connected to an input pin of the and gate circuit, an output of the differential amplifier is connected to the zero-crossing detection circuit simultaneously, an output of the comparator is connected to the and gate circuit as an input signal of the and gate circuit, an output of the and gate circuit is connected to the gate driver, and an output of the gate driver is connected to the gate of the switch Q1.
By adopting the technical scheme, the zero-crossing detection circuit is used for generating the zero-crossing signal, the zero-crossing detection circuit receives the output of the voltage divider as the input signal, the second timer is triggered to enable the capacitor C1 to start charging, the zero-crossing detection circuit can detect the zero-crossing time of the alternating current input in the starting stage and allow the switch Q1 to be switched on, so that the capacitor C1 is charged in a certain time, and the charging time is determined by the second timer.
In some embodiments, the source of the switch Q1 is connected to the system ground through a current detection resistor R2, the source of the switch Q1 is also connected to a current slope detection circuit, the current slope detection circuit is connected to a first timer, and the first timer is connected to the other input pin of the and circuit.
By adopting the technical scheme, the system can be prevented from being triggered due to fault alternating current access, the current slope detection circuit is used for preventing the capacitor C1 from suffering from high avalanche pulses, if the current slope meeting the condition is detected, the system can turn off the switch Q1 to prevent the capacitor C1 from being charged in the period of time, the turn-off time is determined by the first timer, and when the voltage of the capacitor C1 is increased to be lower than the minimum working voltage, the zero-crossing detection circuit is turned off, so that the steady-state operation is ensured.
In some embodiments, the voltage divider includes a resistor R3 and a resistor R4 connected in series, one port of the resistor R4 is connected to the resistor R3 and the zero-crossing detection circuit, and the other port of the resistor R4 is connected to ground.
In some embodiments, the first and second timers, the zero crossing detection circuit, the current slope detection circuit, and the voltage comparison circuit may be implemented using either analog or digital components.
By adopting the technical scheme, the application range is improved, and the AC-DC converter is easier to realize.
In some embodiments, a ceramic capacitor C2 is further included, the ceramic capacitor C2 being connected in parallel across the series connection of capacitor C1 and switch Q1.
By adopting the technical scheme, the ceramic capacitor C2 is used for filtering small ripples, so that a stable direct current output is provided for the load.
In another aspect, the present application discloses an ac-dc conversion system.
The application provides an alternating current-direct current conversion system includes above-mentioned alternating current-direct current converter and the DC-DC converter who is connected with alternating current-direct current converter.
To sum up, the ac-dc converter and the ac-dc conversion system that this application provided include following at least one useful technological effect:
1. through the switch Q1 and the capacitor C1, the capacitor C1 only transfers power to the output when the voltage of the capacitor C1 is lower than the reference voltage, so that the capacitance value of the capacitor C1 can be smaller than that of a conventional power adapter, and the size of the adapter can be significantly reduced;
2. the surge protection is realized through a zero-crossing detection circuit, a current slope detection circuit, a first timer, a second timer and gate drive.
Drawings
FIG. 1 is a block diagram of a conventional AC/DC converter;
fig. 2 is a circuit diagram of an ac-dc converter provided in embodiment 1 of the present application;
fig. 3 is a circuit diagram of an ac-dc converter provided in embodiment 2 of the present application.
In the figure, 1, a rectifier; 10. a filter; 2. a voltage comparison circuit; 21. a differential amplifier; 22. a comparator; 3. a DC-DC converter; 4. a rectifying unit; 5. a zero-crossing detection circuit; 6. a current slope detection circuit; 7. a first timer; 8. a second timer; 10. a gate drive; 101. and gate circuit.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
Example 1
Embodiment 1 of the present application provides an ac-dc converter without surge current protection, as shown in fig. 2, including a rectifier 1, a capacitor C1, a ceramic capacitor C2, a switch Q1, and a voltage comparison circuit 2, where the rectifier 1 is composed of four diodes, the rectifier 1 is configured to receive an ac input, an anode of the capacitor C1 is connected to a positive output terminal of the rectifier 1, a cathode of the capacitor C1 is connected to a switch Q1, the switch Q1 is a field effect transistor, a cathode of the capacitor C1 is connected to a drain of the switch Q1, and a source of the switch Q1 is connected to a negative output terminal of the rectifier 1 and also a system ground; the voltage comparison circuit 2 comprises a differential amplifier 21 and a comparator 22, wherein the positive electrode of a capacitor C1 is simultaneously connected to the positive input end of the differential amplifier 21, the negative electrode of a capacitor C1 is simultaneously connected to the negative input end of the differential amplifier 21, the output end of the differential amplifier 21 is connected to the negative input end of the comparator 22, the positive input end of the comparator 22 is connected with a reference voltage, and the output of the comparator 22 is connected to the gate of a switch Q1 to control the switch Q1; the ceramic capacitor C2 and the load are connected in parallel at two ends of the capacitor C1 and the switch Q1 which are connected in series, the anode of the ceramic capacitor C2 is connected with the anode of the capacitor C1, and the cathode of the ceramic capacitor C2 is connected with the source of the switch Q1.
Of course, a filter 10 is connected between the rectifier 1 and the ac input, the ac input is filtered by the filter 10 and then input to the rectifier 1, the rectifier 1 receives the ac input and outputs a dc voltage to a capacitor C1 and a switch Q1 which are connected in series, that is, the rectifier 1 converts the ac into a dc with a large power ripple, and the capacitor C1 stores energy, thereby providing a stable dc output; the voltage on the capacitor C1 is sampled by the differential amplifier 21 and then compared with the reference voltage by the comparator 22 to control the gate signal of the switch Q1, and the ceramic capacitor C2 is used to filter out small ripples to provide a stable dc output to the load.
In this embodiment of the present application, the switch Q1 is turned on when the voltage of the capacitor C1 is lower than the reference voltage, and the switch Q1 is turned off when the voltage of the capacitor C1 is higher than the reference voltage, so that the capacitance value of the capacitor C1 can be smaller than that of the conventional ac/dc converter, and the size of the ac/dc converter can be significantly reduced. If the capacitor length is less than 20mm, the capacitance value is 102uF, the withstand voltage is 160V, and the capacitor with the diameter of 12.5mm can be used instead of the capacitor with the length of 45mm, the capacitance value is 100uF, the withstand voltage is 450V, and the diameter is 14.5 mm. The alternating current-direct current converter provided by the embodiment of the application can convert alternating current (90-264V) into low voltage (5-20V is used in the mobile phone and the notebook field), provides high-quality electric energy for a battery, and particularly improves the problem that large-volume capacitor in a power supply occupies a large space for low-power occasions, so that the size of a converter is limited.
The application also discloses an alternating current-direct current conversion system, which comprises the alternating current-direct current converter and a DC-DC converter 3 connected with the alternating current-direct current converter, wherein one end of the DC-DC converter 3 is connected to the positive electrode of a capacitor C1, the other end of the DC-DC converter 3 is connected to the source electrode of a switch Q1, and the DC-DC converter 3 converts direct current power into voltage level required by a load.
Example 2
Embodiment 2 of the present application provides an ac-dc converter with surge current protection, as shown in fig. 3, including a rectifier 1, a capacitor C1, a ceramic capacitor C2, a switch Q1, a voltage comparison circuit 2 and a surge protection circuit, as in embodiment 1, the rectifier 1 and the rectifier 1 are composed of four diodes for receiving an ac input, an anode of the capacitor C1 is connected to a positive output terminal of the rectifier 1, a cathode of the capacitor C1 is connected to the switch Q1, the switch Q1 is a field effect transistor, a cathode of the capacitor C1 is connected to a drain of the switch Q1, a source of the switch Q1 is connected to a negative output terminal of the rectifier 1 and is also a system ground; the voltage comparison circuit 2 comprises a differential amplifier 21 and a comparator 22, the positive pole of a capacitor C1 is simultaneously connected to the positive input end of the differential amplifier 21, the negative pole of a capacitor C1 is simultaneously connected to the negative input end of the differential amplifier 21, the output end of the differential amplifier 21 is connected to the negative input end of the comparator 22 and a surge protection circuit, the positive input end of the comparator 22 is connected with a reference voltage, the output end of the comparator 22 is connected to the surge protection circuit, the voltage comparison circuit 2 controls a switch Q1 through the surge protection circuit, and a ceramic capacitor C2 and a load are connected in parallel at two ends of a capacitor C1 and a switch Q1 which are connected in series.
As shown in fig. 3, the surge protection circuit includes a rectifying unit 4, a zero-cross detection circuit 5, a second timer 8, an and circuit 101, and a gate driver 10. The rectifying unit 4 comprises two diodes connected in parallel, a resistor R3 and a resistor R4 which serve as a voltage divider, the rectifying unit 4 receives an alternating current input, the positive output end of the rectifying unit 4 is connected to the resistor R3 and the resistor R4 which are connected in series, one port of the resistor R4 is connected with the resistor R3 and the zero-crossing detection circuit 5 and is used for driving the zero-crossing detection circuit 5, the other port of the resistor R4 is connected with the ground, the zero-crossing detection circuit 5 is connected with the second timer 8 and drives the second timer 8, the second timer 8 is connected to one input pin of the AND gate circuit 101, and the AND gate circuit 101 is connected with the gate driver 10; the output of the differential amplifier 21 is connected to the negative input terminal of the comparator 22 and also connected to the zero-crossing detection circuit 5, the output terminal of the comparator 22 is connected to the and circuit 101 as an input signal of the and circuit 101, the output terminal of the gate driver 10 is connected to the gate of the switch Q1, and the switch Q1 is controlled.
As shown in fig. 3, the surge protection circuit further includes a current detection resistor R2, a current slope detection circuit 6 and a first timer 7, the current detection resistor R2 is connected to the source of the switch Q1, the source of the switch Q1 is connected to the ground of the system through the current detection resistor R2, the voltage on the current detection resistor R2 drives the current slope detection circuit 6, the current slope detection circuit 6 is connected to the first timer 7, the current slope detection circuit 6 drives the first timer 7, and the first timer 7 drives one input pin of the and circuit 101. The ceramic capacitor C2 is connected in parallel to the two ends of the capacitor C1, the switch Q1 and the current detection resistor R2 which are connected in series, the positive electrode of the ceramic capacitor C2 is connected to the positive electrode of the capacitor C1, and the negative electrode of the ceramic capacitor C2 is connected to the ground terminal of the current detection resistor R2.
Certainly, a filter 10 is connected between the rectifier 1 and the rectifying unit 4 and the ac input, the ac input is filtered by the filter 10 and then input to the rectifier 1 and the rectifying unit 4, the rectifier 1 receives the ac power input, converts the ac power into a dc power with a large power ripple, and provides a dc output voltage to a capacitor C1, a switch Q1, and a current detection resistor R2 connected in series, the capacitor C1 is used to store energy, so as to provide a stable dc output, the voltage on the capacitor C1 is sampled by a differential amplifier 21, and then the comparator 22 is compared with a reference voltage to obtain an input signal of the and circuit 101; the rectifying unit 4 is connected to two resistors (resistor R3, resistor R4) serving as a voltage divider to detect the line voltage, the zero-cross detecting circuit 5 receives the output of the voltage divider as an input signal to trigger the second timer 8, and the second timer 8 is connected to the input terminal of the and circuit 101 as one input signal of the and circuit 101; in addition, a high di/dt value on the current detection resistor R2 triggers the first timer 7, the first timer 7 is connected to the other input pin of the and circuit 101 as the other input signal of the and circuit 101, a high di/dt value on the current detection resistor R2 triggers the first timer 7, so that the gate signal of the switch Q1 keeps on state for a short time, if di/dt is still high after the end of the period, the switch Q1 is turned off, the outputs of the first timer 7 and the second timer 8 and the output of the comparator 22 drive the and circuit 101 together, the output of the and circuit 101 controls the gate driver 10, and the gate driver 10 controls the gate of the switch Q1. The ceramic capacitor C2 is used to filter out small ripples, thereby providing a stable dc output to the load.
In this embodiment of the present application, the switch Q1 is turned on when the voltage of the capacitor C1 is lower than the reference voltage, and the switch Q1 is turned off when the voltage of the capacitor C1 is higher than the reference voltage, so that the capacitance value of the capacitor C1 can be smaller than that of the conventional power adaptor, and thus, the size of the adaptor can be significantly reduced. In addition, in this embodiment of the present application, during the starting phase, the zero-cross detection circuit 5 can detect the zero-cross time of the ac input, and allow the switch Q1 to be turned on, so that the capacitor C1 is charged within a certain time, and the charging time is determined by the second timer 8; in order to prevent the system from being triggered due to the fault ac power-on, the current slope detection circuit 6 is used to prevent the capacitor C1 from suffering high avalanche pulses, and if a current slope meeting the condition is detected, the system will turn off the switch Q1 to prevent the capacitor C1 from charging during this time, the turn-off time is determined by the first timer 7, and when the voltage of the capacitor C1 increases to below the minimum operating voltage, the zero-crossing detection circuit 5 is turned off, thereby ensuring steady-state operation.
In the ac-dc converter provided by the present application, the first timer 7, the second timer 8, the zero-cross detection circuit 5, the current slope detection circuit 6, and the voltage comparison circuit 2 may be implemented by analog components or digital components.
The application also discloses an alternating current-direct current conversion system, which comprises the alternating current-direct current converter and a DC-DC converter 3 connected with the alternating current-direct current converter, wherein one end of the DC-DC converter 3 is connected with the anode of a capacitor C1, the other end of the DC-DC converter 3 is connected with the grounding end of a current detection resistor R2, and the DC-DC converter 3 converts direct current power into voltage level required by a load.
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method and the core idea of the present application, and should not be construed as limiting the present application. Those skilled in the art should also appreciate that various modifications and substitutions can be made without departing from the scope of the present disclosure.
Claims (10)
1. An AC-DC converter, comprising: the filter (10), the rectifier (1), the capacitor C1, the switch Q1 and the voltage comparison circuit (2), wherein the rectifier (1) receives an alternating current input, the positive pole of the capacitor C1 is connected to the positive output end of the rectifier (1), the negative pole of the capacitor C1 is connected to the switch Q1, the switch Q1 is connected to the negative output end of the rectifier (1), and the switch Q1 is grounded; two ends of the capacitor C1 are connected to the input end of the voltage comparison circuit (2), meanwhile, the voltage comparison circuit (2) inputs a reference voltage, and the output end of the voltage comparison circuit (2) is connected to the switch Q1.
2. The ac-dc converter according to claim 1, wherein the voltage comparison circuit (2) comprises a differential amplifier (21) and a comparator (22), the positive terminal of the capacitor C1 is connected to the positive input terminal of the differential amplifier (21), the negative terminal of the capacitor C1 is connected to the negative input terminal of the differential amplifier (21), the output terminal of the differential amplifier (21) is connected to the negative input terminal of the comparator (22), the positive input terminal of the comparator (22) is connected to a reference voltage, and the output of the comparator (22) is connected to the gate of the switch Q1.
3. The ac-dc converter according to claim 2, wherein the switch Q1 is a fet, the negative terminal of the capacitor C1 is connected to the drain of the switch Q1, the source of the switch Q1 is connected to the negative output terminal of the rectifier 1, the source of the switch Q1 is also the system ground, and the output of the comparator (22) is connected to the gate of the switch Q1.
4. The converter according to claim 3, further comprising a surge protection circuit connected between the voltage comparison circuit (2) and the switch Q1.
5. The AC-DC converter according to claim 4, wherein the surge protection circuit comprises a rectifying unit (4), a zero-crossing detection circuit (5), a second timer (8), an AND gate circuit (101) and a gate driver (10), an AC input drives the rectifying unit (4) simultaneously, an output of the rectifying unit (4) is connected with a voltage divider, an output of the voltage divider is connected with the zero-crossing detection circuit (5), the zero-crossing detection circuit (5) is connected with the second timer (8), the second timer (8) is connected with an input pin of the AND gate circuit (101), an output of the differential amplifier (21) is connected with the zero-crossing detection circuit (5), an output of the comparator (22) is connected with the AND gate circuit (101) as an input signal of the AND gate circuit (101), the output of the and circuit (101) is connected to the gate drive (10), and the output of the gate drive (10) is connected to the gate of the switch Q1.
6. The AC-DC converter according to claim 5, wherein the source of the switch Q1 is connected to the system ground through a current detection resistor R2, the source of the switch Q1 is simultaneously connected to a current slope detection circuit (6), the current slope detection circuit (6) is connected to a first timer (7), and the first timer (7) is connected to the other input pin of the AND circuit (101).
7. The AC-DC converter according to claim 5, wherein the voltage divider comprises a resistor R3 and a resistor R4 connected in series, one port of the resistor R4 is connected to the resistor R3 and the zero-crossing detection circuit (5), and the other port of the resistor R4 is connected to ground.
8. AC/DC converter according to claim 6, characterized in that the first timer (7), the second timer (8), the zero crossing detection circuit (5), the current slope detection circuit (6), and the voltage comparison circuit (2) can be implemented with either analog or digital components.
9. The AC-DC converter according to any one of claims 1 to 8, further comprising a ceramic capacitor C2, wherein the ceramic capacitor C2 is connected in parallel across the series connection of capacitor C1 and switch Q1.
10. ac-DC conversion system, characterized in that it comprises an ac-DC converter according to claim 9 and a DC-DC converter (3) connected to the ac-DC converter.
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| CN202110189622.3A CN112968616B (en) | 2021-02-19 | 2021-02-19 | AC-DC converter and AC-DC conversion system |
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| CN202110189622.3A CN112968616B (en) | 2021-02-19 | 2021-02-19 | AC-DC converter and AC-DC conversion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825895A (en) * | 2022-06-27 | 2022-07-29 | 合肥博雷电气有限公司 | Input anti-surge slow starting circuit with overcurrent protection function |
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| CN114825895B (en) * | 2022-06-27 | 2022-09-20 | 合肥博雷电气有限公司 | Input anti-surge slow starting circuit with overcurrent protection function |
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