CN214314537U - Protection circuit of push-pull type direct current booster circuit - Google Patents
Protection circuit of push-pull type direct current booster circuit Download PDFInfo
- Publication number
- CN214314537U CN214314537U CN202022068520.XU CN202022068520U CN214314537U CN 214314537 U CN214314537 U CN 214314537U CN 202022068520 U CN202022068520 U CN 202022068520U CN 214314537 U CN214314537 U CN 214314537U
- Authority
- CN
- China
- Prior art keywords
- push
- electrically connected
- circuit
- output end
- storage battery
- 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
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model provides a protection circuit of push-pull type direct current booster circuit, through setting up the hysteresis comparator, gather the electric current of the negative pole output of battery, and judge whether the electric current overflows, when the electric current overflows, the hysteresis comparator outputs a high level to PWM control chip and alarm module, PWM control chip stops outputting PWM pulse signal drive push-pull type direct current booster circuit work, thereby reduce the reactive loss that push-pull type direct current booster circuit produced, make photovoltaic inverter's reliability obtain effectively improving; through setting up the fuse module, play the guard action when the electric current of the positive output of battery output overflows, the fuse module blows when the positive output electric current of battery is too high to protection circuit components and parts are not burnt out.
Description
Technical Field
The utility model relates to an inverter technical field especially relates to a push-pull type direct current booster circuit's protection circuit.
Background
The photovoltaic inverter is used for generating stable high-voltage direct current by boosting low-voltage direct current in the storage battery through direct current and then converting the stable high-voltage direct current into alternating current through an inverter circuit. The direct current boost of the photovoltaic inverter mainly adopts push-pull direct current boost, the push-pull direct current boost is driven by inputting PWM pulse signals by a PWM control chip, and the reliability of a push-pull direct current boost circuit plays a certain role in determining the performance of the inverter. The existing photovoltaic inverter adopts a power supply formed by a storage battery to supply power to the push-pull type direct current booster circuit, when the power supply is in overcurrent, the power supply is disconnected, but at the moment, the PWM control chip continues to input pulse signals to drive the push-pull type direct current booster circuit to work, so that the push-pull type direct current booster circuit generates reactive loss, and the reliability of the photovoltaic inverter is greatly reduced.
Therefore, in order to solve the above problem, the utility model provides a protection circuit of push-pull direct current boost circuit, through setting up the hysteresis comparator, when push-pull direct current boost circuit's power supply overflows, the PWM pulse enable end of PWM control chip is given to a hysteresis comparator input signal, PWM control chip stops output PWM pulse signal drive push-pull direct current boost circuit work, thereby reduce the reactive loss that push-pull direct current boost circuit produced, make photovoltaic inverter's reliability obtain effectively improving.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a protection circuit of push-pull direct current boost circuit, through setting up the hysteresis comparator, when push-pull direct current boost circuit's power supply overcurrent, the PWM pulse enable end that PWM control chip was given to a signal of hysteresis comparator input, and PWM control chip stops output PWM pulse signal drive push-pull direct current boost circuit work to reduce the reactive loss that push-pull direct current boost circuit produced, make photovoltaic inverter's reliability obtain effectively improving.
The technical scheme of the utility model is realized like this: the utility model provides a protection circuit of a push-pull type direct current booster circuit, which comprises a PWM control chip, a storage battery, a push-pull type direct current booster circuit and a hysteresis comparator;
the negative electrode output end of the storage battery is electrically connected with the input end of the hysteresis comparator, the output end of the hysteresis comparator is electrically connected with the PWM pulse enabling end of the PWM control chip, and the PWM output end of the PWM control chip is electrically connected with the control end of the push-pull type direct current booster circuit.
On the basis of the above technical solution, preferably, the hysteresis comparator includes a reference voltage, a potentiometer R5, an operational amplifier LM324, resistors R39-R42, capacitors C23-C25, a diode D8, and a diode D9;
the negative output end of the storage battery is electrically connected with a third pin of a potentiometer R5, a second pin of the potentiometer R5 is electrically connected with one end of a resistor R39, a second pin of the potentiometer R5 is electrically connected with a first pin of the potentiometer R5, the other end of the resistor R39 is electrically connected with the inverting input end of an operational amplifier LM324 through a resistor R40, one end of a resistor R41 is electrically connected with a reference voltage, the other end of the resistor R41 and one end of a capacitor C23 are respectively electrically connected with the other end of a resistor R39, the other end of the capacitor C23 is grounded, a capacitor C24 is connected in parallel with the two ends of the capacitor C23, the non-inverting input end of the operational amplifier LM324 is respectively electrically connected with one end of a resistor R42 and the negative electrode of a diode D8, the other end of the resistor R42 is grounded, the output end of the operational amplifier LM324 is respectively electrically connected with the positive electrode of a diode D8 and the positive electrode of a diode D9, the negative electrode of a diode D9 is electrically connected with the PWM pulse enable end of the PWM control chip, the capacitor C25 is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier LM 324.
On the basis of the technical scheme, the device preferably further comprises a voltage stabilizing module;
the positive output end of the storage battery and the negative output end of the storage battery are respectively electrically connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected with the power supply end of the push-pull type direct current booster circuit. On the basis of the technical scheme, the fuse protector further comprises a fuse module;
the fuse module is connected in series between the negative output end of the storage battery and the input end of the voltage stabilizing module.
Even more preferably, the fuse module includes fuses F1-F4;
the negative electrode output end of the storage battery is electrically connected with the input end of the voltage stabilizing module through fuses F1-F4 which are connected in parallel.
Still further preferably, the system further comprises a filter circuit;
the filter circuit is connected in parallel between the positive output end of the storage battery and the input end of the fuse module.
Still further preferably, the power supply reverse connection protection circuit is further included;
the power supply reverse connection protection circuit is connected in parallel between the anode output end of the storage battery and the input end of the fuse module.
The utility model discloses a push-pull type direct current boost circuit's protection circuit has following beneficial effect for prior art:
(1) the hysteresis comparator is arranged to collect the current output by the cathode output end of the storage battery and judge whether the current is overcurrent, when the current is overcurrent, the hysteresis comparator outputs a high level to the PWM control chip and the alarm module, and the PWM control chip stops outputting PWM pulse signals to drive the push-pull type direct current booster circuit to work, so that the reactive loss generated by the push-pull type direct current booster circuit is reduced, and the reliability of the photovoltaic inverter is effectively improved;
(2) by arranging the fuse module, the protection effect is achieved when the current output by the positive output end of the storage battery is over-current, and the fuse module is blown when the current output by the positive output end of the storage battery is over-high, so that circuit components are protected from being burned out;
(3) through setting up filter circuit, the high frequency interference signal among the filtering battery output current reduces battery output current ripple coefficient, makes output current more stable, improves the reliability of battery, and further makes photovoltaic inverter's reliability obtain effectively improving.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system structure diagram of a protection circuit of a push-pull dc boost circuit according to the present invention;
fig. 2 is a circuit diagram of a hysteresis comparator in a protection circuit of a push-pull dc boost circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a protection circuit of push-pull type direct current boost circuit, it includes PWM control chip, battery, push-pull type direct current boost circuit, hysteresis comparator, voltage stabilizing module, fuse module, filter circuit and power reversal protection circuit.
The storage battery is used for providing an input power supply for a power supply of the push-pull type direct current booster circuit, the output voltage is stable, charging and discharging can be carried out continuously, and the problem that the inverter is unstable due to the fact that the existing inverter adopts an AC-DC power supply circuit to output large voltage ripples and switching noise is solved. The negative pole output of battery and the input electric connection of hysteresis comparator, the fuse module is established ties between the negative pole output of battery and voltage stabilizing module's input, and filter circuit connects in parallel between the anodal output of battery and the input of fuse module, and the power is reversed and is connect protection circuit and connect in parallel between the anodal output of battery and the input of fuse module, the anodal output of battery and voltage stabilizing module's input electric connection.
The filter circuit filters high-frequency interference signals in the output current of the storage battery, reduces the ripple coefficient of the output current of the storage battery, enables the output current to be more stable, improves the reliability of the storage battery, and further enables the reliability of the photovoltaic inverter to be effectively improved. The filter circuit is connected in parallel between the positive output end of the storage battery and the input end of the fuse module. The present embodiment does not involve an improvement in the structure of the filter circuit, and therefore, the circuit structure of the filter circuit is not described again here.
The power supply reverse connection protection circuit is used for protecting a circuit of a power supply of the push-pull type direct current booster circuit, when the anode output end of the storage battery and the cathode output end of the storage battery are connected reversely, the power supply reverse connection protection circuit is conducted, the current in the circuit is close to infinity, the fuse module is blown, and therefore the storage battery is protected from being broken down. The power supply reverse connection protection circuit is connected in parallel between the anode output end of the storage battery and the input end of the fuse module. The present embodiment does not relate to the improvement of the structure of the power reverse connection protection circuit, and therefore, the circuit structure of the power reverse connection protection circuit is not described again.
And the voltage stabilizing module is used for stably reducing the voltage output by the storage battery to the power supply voltage required by the push-pull type direct current booster circuit. The positive output end of the storage battery and the negative output end of the storage battery are respectively electrically connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected with the power supply end of the push-pull type direct current booster circuit. The present embodiment does not involve the improvement of the structure of the voltage stabilizing module, and therefore, the circuit structure of the voltage stabilizing module is not described herein again, preferably, in the present embodiment, the voltage stabilizing module adopts the existing LM7812 voltage stabilizing chip to step down, and outputs 12V of supply voltage to the push-pull type dc boost circuit after step down.
The fuse module plays a role in protection when the current output by the storage battery is overcurrent, and the fuse module is blown when the output current of the storage battery is too high, so that circuit components are protected from being burnt out, the reliability of a power supply source is improved, and the reliability of the photovoltaic inverter is further effectively improved. The fuse module is connected in series between the negative output end of the storage battery and the input end of the voltage stabilizing module. Preferably, in this embodiment, the fuse module includes fuses F1-F4; the negative electrode output end of the storage battery is electrically connected with the input end of the voltage stabilizing module through fuses F1-F4 which are connected in parallel. The fuses F1-F4 are connected in parallel to divide the current, and are used for improving the current bearing capacity of the fuse module.
The hysteretic comparator is used for collecting the current output by the cathode output end of the storage battery and judging whether the current is overcurrent or not, when the current is overcurrent, the hysteretic comparator outputs a high level to the PWM control chip, and the PWM control chip stops outputting PWM pulse signals to drive the push-pull type direct current booster circuit to work, so that the reactive loss generated by the push-pull type direct current booster circuit is reduced, and the reliability of the photovoltaic inverter is effectively improved. The input end of the hysteresis comparator is electrically connected with the negative electrode output end of the storage battery, and the output end of the hysteresis comparator is electrically connected with the PWM pulse enabling end of the PWM control chip.
Preferably, in the embodiment, as shown in fig. 2, the hysteresis comparator includes a reference voltage, a potentiometer R5, an operational amplifier LM324, resistors R39-R42, capacitors C23-C25, a diode D8, and a diode D9; the negative output end of the storage battery is electrically connected with the third pin of the potentiometer R5, the second pin of the potentiometer R5 is electrically connected with one end of a resistor R39, the second pin of the potentiometer R5 is electrically connected with the first pin thereof, the other end of the resistor R39 is electrically connected with the inverting input end of the operational amplifier LM324 through a resistor R40, one end of a resistor R41 is electrically connected with a reference voltage, the other end of the resistor R41 and one end of a capacitor C23 are respectively electrically connected with the other end of a resistor R39, the other end of the capacitor C23 is grounded, a capacitor C24 is connected in parallel with the two ends of the capacitor C23, the non-inverting input end of the operational amplifier LM324 is respectively electrically connected with one end of a resistor R42 and the negative electrode of a diode D8, the other end of the resistor R42 is grounded, the output end of the operational amplifier LM324 is respectively electrically connected with the positive electrode of a diode D8 and the positive electrode of a diode D9, the negative electrode of a diode D9 is electrically connected with the PWM pulse of the PWM control chip to enable electrical connection, the capacitor C25 is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier LM 324. In the present embodiment, as shown in fig. 2, the reference voltage is +5V, the operational amplifier LM324 is represented by U4C, and the hysteresis comparator collects the current at the negative output terminal of the battery and is represented by IPK.
Wherein, the potentiometer R5 is a protection resistor, and the resistance value of the potentiometer is adjusted to prevent the circuit from being burnt by the operational amplifier LM324 when the current is too large; the resistors R39-R40 are load resistors and prevent the short circuit from breaking down; the resistors R41-R42 are pull-up resistors, so that the reference voltage is more stable; the capacitors C23-C24 are filter capacitors and filter circuit interference signals; the capacitor C25 is a compensation capacitor for compensating the phase effect caused by the input capacitor of the operational amplifier LM 324; the operational amplifier LM324 is a current comparator and is used for comparing current values input by a non-inverting input end and an inverting input end; the diode D8 is a limiting diode, and voltage instability caused by circuit interference or noise is prevented; diode D9 is a forward diode; when the current value input by the non-inverting input end is larger than the current value input by the inverting input end, the operational amplifier LM324 outputs high level, the diode D8 and the diode D9 are conducted, the high level is output to the PWM pulse enabling end of the PWM control chip, the current output by the operational amplifier LM324 is fed back to the non-inverting input end through the diode D8, and the output of the operational amplifier LM324 is more stable; when the current value input by the inverting input terminal is larger than that input by the non-inverting input terminal, the operational amplifier LM324 outputs a low level, and the diode D8 and the diode D9 are turned off.
When the output end of the hysteresis comparator outputs a high level, the PWM pulse enable end of the PWM control chip controls the PWM output end to stop outputting PWM pulse signals to the push-pull type direct current booster circuit; when the output end of the hysteresis comparator outputs a low level, the PWM output end of the PWM control chip normally outputs a PWM pulse signal to the push-pull type direct current booster circuit. The PWM pulse enable end of the PWM control chip is electrically connected with the output end of the hysteresis comparator, and the PWM output end of the PWM control chip is electrically connected with the control end of the push-pull type direct current booster circuit. Preferably, in this embodiment, the PWM control chip is an SG3525 chip, and the SHUT is a PWM pulse enable terminal of the PWM control chip.
And the push-pull type direct current booster circuit is used for amplifying the PWM pulse signal output by the PWM output end of the PWM control chip. And the control end of the push-pull type direct current booster circuit is electrically connected with the PWM output end of the PWM control chip. The present embodiment does not relate to the improvement of the push-pull dc boost circuit structure, and therefore, the push-pull dc boost circuit structure will not be described in detail herein.
The utility model discloses a theory of operation is: when the current output by the positive output end of the storage battery is not overcurrent, the output current of the storage battery is filtered by the filter circuit to remove ripple signals and high-frequency interference signals with different frequencies in the output current of the storage battery, and then is subjected to reverse connection judgment by the power reverse connection protection circuit; if the positive output end of the storage battery and the negative output end of the storage battery are not in reverse connection, the power supply reverse connection protection circuit is disconnected, the current filtered by the filter circuit flows into the voltage stabilizing module to be reduced, the current is output to the push-pull type direct current booster circuit after being reduced, the negative output end of the storage battery outputs the current to the hysteresis comparator, the hysteresis comparator outputs low level, the PWM output end continuously outputs PWM pulse signals to the push-pull type direct current booster circuit, and the push-pull type direct current booster circuit amplifies the output PWM pulse signals;
when the output current of the positive output end of the storage battery is over-current, the current output by the positive output end of the storage battery is filtered by the filter circuit to remove ripple signals and high-frequency interference signals with different frequencies in the output current of the storage battery and then is subjected to reverse connection judgment by the power reverse connection protection circuit; if the positive output end of the storage battery and the negative output end of the storage battery are not reversely connected, the power supply reverse connection protection circuit is disconnected, the current flows into the fuse module after filtering by the filter circuit, the fuse module is fused, the voltage stabilizing module does not work, the power supply does not supply power to the push-pull type direct current booster circuit, the negative output end of the storage battery outputs current to the hysteresis comparator, the hysteresis comparator outputs high level to the PWM pulse enable end of the PWM control chip and the input end of the alarm module, and the PWM output end stops outputting PWM pulse signals to the push-pull type direct current booster circuit.
The beneficial effect of this embodiment does: the hysteresis comparator is arranged to collect the current output by the cathode output end of the storage battery and judge whether the current is overcurrent, when the current is overcurrent, the hysteresis comparator outputs a high level to the PWM control chip and the alarm module, and the PWM control chip stops outputting PWM pulse signals to drive the push-pull type direct current booster circuit to work, so that the reactive loss generated by the push-pull type direct current booster circuit is reduced, and the reliability of the photovoltaic inverter is effectively improved;
by arranging the fuse module, the protection effect is achieved when the current output by the positive output end of the storage battery is over-current, and the fuse module is blown when the current output by the positive output end of the storage battery is over-high, so that circuit components are protected from being burned out;
through setting up filter circuit, the high frequency interference signal among the filtering battery output current reduces battery output current ripple coefficient, makes output current more stable, improves the reliability of battery, and further makes photovoltaic inverter's reliability obtain effectively improving.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a protection circuit of push-pull type direct current boost circuit, its includes PWM control chip, battery, push-pull type direct current boost circuit which characterized in that: the hysteresis comparator is also included;
the negative electrode output end of the storage battery is electrically connected with the input end of the hysteresis comparator, the output end of the hysteresis comparator is electrically connected with the PWM pulse enabling end of the PWM control chip, and the PWM output end of the PWM control chip is electrically connected with the control end of the push-pull type direct current booster circuit.
2. A protection circuit for a push-pull dc boost circuit as claimed in claim 1, characterized in that: the hysteresis comparator comprises a reference voltage, a potentiometer R5, an operational amplifier LM324, resistors R39-R42, capacitors C23-C25, a diode D8 and a diode D9;
the negative output end of the storage battery is electrically connected with a third pin of a potentiometer R5, a second pin of a potentiometer R5 is electrically connected with one end of a resistor R39, a second pin of the potentiometer R5 is electrically connected with a first pin of the potentiometer R5, the other end of the resistor R39 is electrically connected with the inverting input end of an operational amplifier LM324 through a resistor R40, one end of a resistor R41 is electrically connected with a reference voltage, the other end of the resistor R41 and one end of a capacitor C23 are respectively electrically connected with the other end of a resistor R39, the other end of the capacitor C23 is grounded, a capacitor C24 is connected in parallel with the two ends of the capacitor C23, the non-inverting input end of the operational amplifier LM324 is respectively electrically connected with one end of a resistor R42 and the negative electrode of a diode D8, the other end of the resistor R42 is grounded, the output end of the operational amplifier LM324 is respectively electrically connected with the positive electrode of a diode D8 and the positive electrode of a diode D9, the negative electrode of a diode D9 is electrically connected with the PWM Pulse Width Modulation (PWM) control chip so as to enable electrical connection, the capacitor C25 is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier LM 324.
3. A protection circuit for a push-pull dc boost circuit as claimed in claim 1, characterized in that: the device also comprises a voltage stabilizing module;
the positive output end of the storage battery and the negative output end of the storage battery are respectively electrically connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected with the power supply end of the push-pull type direct current booster circuit.
4. A protection circuit for a push-pull dc boost circuit as claimed in claim 1, characterized in that: also includes a fuse module;
the fuse module is connected in series between the negative output end of the storage battery and the input end of the voltage stabilizing module.
5. The protection circuit of a push-pull dc boost circuit as claimed in claim 4, characterized in that: the fuse module includes fuses F1-F4;
and the negative electrode output end of the storage battery is electrically connected with the input end of the voltage stabilizing module through fuses F1-F4 which are connected in parallel.
6. The protection circuit of a push-pull dc boost circuit as claimed in claim 4, characterized in that: the circuit also comprises a filter circuit;
the filter circuit is connected in parallel between the anode output end of the storage battery and the input end of the fuse module.
7. The protection circuit of a push-pull dc boost circuit as claimed in claim 4, characterized in that: the power supply reverse connection protection circuit is also included;
and the power supply reverse connection protection circuit is connected between the anode output end of the storage battery and the input end of the fuse module in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022068520.XU CN214314537U (en) | 2020-09-19 | 2020-09-19 | Protection circuit of push-pull type direct current booster circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022068520.XU CN214314537U (en) | 2020-09-19 | 2020-09-19 | Protection circuit of push-pull type direct current booster circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214314537U true CN214314537U (en) | 2021-09-28 |
Family
ID=77827461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022068520.XU Active CN214314537U (en) | 2020-09-19 | 2020-09-19 | Protection circuit of push-pull type direct current booster circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214314537U (en) |
-
2020
- 2020-09-19 CN CN202022068520.XU patent/CN214314537U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108075562B (en) | High-power portable electric equipment and power supply control device and method thereof | |
| WO2018129831A1 (en) | Smart short circuit protection switch circuit for modified wave inverter | |
| CN107276401B (en) | Intrinsically safe power conditioning circuit | |
| CN214314537U (en) | Protection circuit of push-pull type direct current booster circuit | |
| CN108199568A (en) | A kind of inhibition in-rush current limiting circuit | |
| CN109936194B (en) | Power supply circuit of battery management system | |
| CN216794664U (en) | Charging circuit and charger | |
| CN213185489U (en) | Photovoltaic inverter | |
| CN115940382A (en) | Standby power charging device and vehicle-mounted LCD (liquid Crystal display) play controller standby power system | |
| CN215580465U (en) | Charging circuit for electrolyzing water | |
| CN213185488U (en) | Protection circuit based on photovoltaic inverter | |
| CN204886735U (en) | Direct current power circuit | |
| CN210577783U (en) | Surge current suppression circuit and switching power supply | |
| CN209963747U (en) | Switching power supply output hot plug and reverse connection short-circuit protection circuit | |
| CN209571821U (en) | A kind of inrush current suppression circuit | |
| CN213279144U (en) | Power supply circuit suitable for inverter | |
| CN213185487U (en) | Power circuit of photovoltaic inverter | |
| CN213279143U (en) | Photovoltaic inverter comprising over-temperature protection circuit | |
| CN217882832U (en) | Short-circuit protection circuit | |
| CN117595458B (en) | Program-controlled power supply circuit with charging protection function | |
| CN214755482U (en) | Overcurrent protection circuit of external fan of photovoltaic inverter | |
| CN208752487U (en) | A kind of constant-current circuit of dust catcher | |
| CN215897610U (en) | Energy-saving AC-DC power supply aging tester | |
| CN212435360U (en) | Overvoltage protection device for high pitch loudspeaker | |
| CN218850386U (en) | Novel input undervoltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |