CN116054549A - Control module for suppressing hot start surge current of switching power supply - Google Patents
Control module for suppressing hot start surge current of switching power supply Download PDFInfo
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- CN116054549A CN116054549A CN202310306519.1A CN202310306519A CN116054549A CN 116054549 A CN116054549 A CN 116054549A CN 202310306519 A CN202310306519 A CN 202310306519A CN 116054549 A CN116054549 A CN 116054549A
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- 230000002401 inhibitory effect Effects 0.000 abstract description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- 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
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a control module for inhibiting hot start surge current of a switching power supply, which comprises an AC input end, a DC-DC conversion circuit and a rectification full-bridge D1 positioned between the AC input end and the DC-DC conversion circuit, wherein a filter capacitor C1 is arranged between the rectification full-bridge D1 and the DC-DC conversion circuit, a thermistor NTC is arranged between the AC input end and the rectification full-bridge D1, and the control module comprises a switching circuit connected with the thermistor NTC in parallel, a relay K1 arranged on the switching circuit and a driving module used for carrying out switch driving control on the relay K1 according to the output state of the DC-DC conversion circuit. According to the invention, the control module can effectively inhibit surge current during hot start of the switching power supply, and damage to the rectifying device is avoided, so that the switching power supply is safer to operate. The bypass of the thermistor can be realized, thereby reducing the energy loss. The requirements of delay protection and the like are met, no additional control element is needed, and the circuit is simple and smart in constitution and stable and reliable in operation.
Description
Technical Field
The invention relates to a control module for inhibiting hot start surge current of a switching power supply, and belongs to the technical field of energy-saving protection of switching power supplies.
Background
When the PV power of the photovoltaic energy storage inverter is lost at night or on cloudy days, an SPS switching power supply on the AC side needs to be started so as to ensure the stability of all levels of power supplies required by the normal operation of the energy storage inverter. The input voltage of the AC SPS is obtained from the alternating current voltage of the commercial power, relatively stable direct current high voltage is obtained after rectification and capacitance filtering of a rectifier bridge, and the working voltage required by each stage of load is obtained through DC-DC buck conversion. The voltage across the capacitor is approximately 0V before the AC voltage is switched on. At the moment of AC access, the voltage across the capacitor cannot be suddenly changed, or 0V, which is equivalent to a short circuit, and the conduction voltage drop of the rectifier bridge diode is very small, and this transient high current flows through the rectifier diode, and if the current exceeds the maximum surge current allowed to pass through the diode, there is a great risk of burning out the diode, because the rectifier diode has a parameter called Ifsm, i.e. the maximum surge current allowed to pass through is limited.
Aiming at the problem, a protection scheme exists in the prior art, a fuse is added between a mains supply access point and a rectifier bridge, but once the fuse is blown, the fuse needs to be replaced frequently in time, so that the continuous stability of SPS is affected and the cost is increased; or the fuse is replaced by a resistor with a larger resistance value, so that the surge current can be inhibited, but the heating loss of the resistor is brought, and the efficiency of the power supply is greatly reduced; still another solution is to use an NTC thermistor, as shown in fig. 3, whose resistance is inversely related to the change of temperature, i.e. the higher the temperature, the lower the resistance. At the starting moment, the temperature of the thermistor is relatively low, so that the resistance is relatively large, and the surge current during starting can be well limited. After the power-on, the temperature of the thermistor rises, the resistance value is obviously reduced, and the current does not generate excessive loss after flowing through the NTC. However, the loss exists at all times, and especially for a switching power supply with higher power, the steady-state current is larger, and the loss on the NTC is not negligible. Moreover, the most critical problem is that if the power supply is suddenly de-energized after a period of steady operation, at which time the NTC temperature is high and then rapidly energized, at which time the thermistor temperature remains high and its resistance remains small. The thermistor loses ideal protection effect during hot start, surge current can be large, and risk and defect of burning out the rectifier diode still exist.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and creatively provides a control module for inhibiting hot start surge current of a switching power supply, aiming at the problems that the protection effect is lost and the NTC has energy loss after the traditional NTC is powered on quickly after overheat and power off.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the control module for the hot start surge current of the switching power supply comprises an AC input end, a DC-DC conversion circuit and a rectification full bridge D1 positioned between the AC input end and the DC-DC conversion circuit, wherein a filter capacitor C1 is arranged between the rectification full bridge D1 and the DC-DC conversion circuit, and a thermistor NTC is arranged between the AC input end and the rectification full bridge D1, and is characterized in that:
the control module comprises a switch circuit connected with the thermistor NTC in parallel, a relay K1 arranged on the switch circuit, and a driving module for performing switch driving control on the relay K1 according to the output state of the DC-DC conversion circuit,
the relay K1 comprises a relay switch, a coil matched with the relay switch relatively and a power supply circuit electrically connected with the coil, and the driving module is arranged on the power supply circuit and electrically connected with the DC-DC conversion circuit.
Preferably, the power supply circuit includes a first power supply end disposed on the DC-DC conversion circuit, one end of the coil is connected to the first power supply end, the other end of the coil is provided with a grounding branch, and the driving module is a switch control module disposed on the grounding branch.
Preferably, the switch control module is a field effect switch circuit, and the DC-DC conversion circuit includes a second power supply terminal for supplying power to the field effect switch circuit.
Preferably, a delay element is connected in parallel between the two ends of the coil.
Preferably, the field effect switch circuit comprises a field effect transistor Q1 arranged on the grounding support, the drain electrode of the field effect transistor Q1 is connected with the coil, a capacitor C2 and a resistor R2 are connected in parallel between the source electrode and the grid electrode of the field effect transistor Q1,
a resistor R1 is arranged between the connection point of the capacitor C2 and the grid electrode of the field effect transistor Q1 and the second power supply end,
the source electrode of the field effect transistor Q1 is grounded.
Preferably, the delay element is a diode D2.
Preferably, the relay K1 is a packaged relay on the switching power supply, and the filter capacitor C1 is an aluminum electrolytic capacitor.
The beneficial effects of the invention are mainly as follows:
1. the control module can effectively inhibit surge current during hot start of the switching power supply, and damage to the rectifying device is avoided, so that the switching power supply is safer to operate.
2. The bypass of the thermistor can be realized, thereby reducing the energy loss.
3. The requirements of delay protection and the like are met, no additional control element is needed, and the circuit is simple and smart in constitution and stable and reliable in operation.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 is a schematic diagram of the overall circuit configuration of a control module for a switching power supply to suppress hot start surge current according to the present invention.
FIG. 2 is a schematic diagram of the workflow of the control module for a switching power supply to suppress hot start inrush current of the present invention.
Fig. 3 is a schematic circuit configuration diagram of a conventional switching power supply.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The invention provides a control module for suppressing hot start surge current of a switching power supply, as shown in fig. 2, the switching power supply comprises an AC input end, a DC-DC conversion circuit and a rectification full-bridge D1 positioned between the AC input end and the DC-DC conversion circuit, a filter capacitor C1 is arranged between the rectification full-bridge D1 and the DC-DC conversion circuit, a thermistor NTC is arranged between the AC input end and the rectification full-bridge D1, and the circuit of the switching power supply belongs to the prior art, so that the connection relation and the like of the circuit are not expanded.
In the traditional switching power supply, the thermistor is adopted to inhibit surge current, and at the starting moment, the temperature of the thermistor is relatively low, so that the resistance is relatively large, and the surge current during starting can be well limited. After the power-on, the temperature of the thermistor rises, and the resistance is obviously reduced, so that the switching power supply is protected.
However, in the operation process of the photovoltaic energy storage inverter, a possibility scene of short power failure and opening can appear, and at the moment, the temperature of the thermistor is not cooled, and the resistance value is small, so that the hot start requirement cannot be met, at the moment, surge current can be large, and the conditions of burning out a rectifier diode and the like exist. In addition, thermistors also have certain electrical energy losses during energization, especially in larger power switching power supply applications, which are not negligible.
As shown in fig. 1, the control module of the present invention includes a switching circuit connected in parallel with the thermistor NTC, a relay K1 provided on the switching circuit, and a driving module for performing switching driving control on the relay K1 according to the output state of the DC-DC conversion circuit.
The specific implementation process and principle description:
after the switch circuit is electrified, surge current is restrained by the thermistor NTC, and when the switch circuit runs stably, the rear-end DC-DC conversion circuit outputs stably.
At this time, after the driving module obtains the stable output state of the DC-DC conversion circuit, the driving module drives the relay K1 in a passage way, so that the switching circuit is in short circuit with the thermistor NTC, at this time, the resistance value of the switching circuit is smaller, the switching circuit is directly used as the electric passage way from the AC input end to the rectification full bridge D1, and at this time, the thermistor NTC can be cooled gradually.
When the switch circuit is possibly disconnected and restarted, the DC-DC conversion circuit is disconnected, the relay K1 enables the switch circuit to be disconnected, the thermistor NTC can restore the surge current suppression function, so that circuit protection is realized, and in addition, the thermistor NTC cannot generate access loss due to the short circuit of the switch circuit, so that the energy-saving effect is realized.
The relay K1 comprises a relay switch, a coil matched with the relay switch relatively, and a power supply circuit electrically connected with the coil, wherein the driving module is arranged on the power supply circuit and electrically connected with the DC-DC conversion circuit.
Specifically, in general, the power supply circuit may have an independent power supply, the coil uses the power supply circuit to directly supply power, and the driving module is disposed on the power supply circuit and is used for controlling the power on or off of the power supply circuit, and has an electrical connection relationship with the DC-DC conversion circuit, so that the power supply circuit can monitor the stable output state of the DC-DC conversion circuit, and after the power supply circuit monitors the stable output information of the DC-DC conversion circuit, the power supply circuit of the coil can be controlled to be turned on or off, so as to meet the short-circuit requirement of the thermistor in the stable output state.
It should be noted that, the driving module may adopt a signal analog switch or a circuit switch, and the switch is provided with a communication controller, and the communication controller may implement triggering and closing of the switch through the information acquisition of the IO port of the DC-DC conversion circuit.
In a specific embodiment, the power supply circuit comprises a first power supply end arranged on the DC-DC conversion circuit, one end of the coil is connected with the first power supply end, the other end of the coil is provided with a grounding branch, and the driving module is a switch control module arranged on the grounding branch.
That is, the first power supply end of the DC-DC conversion circuit directly supplies power to the coil, and in general, the switch control module may be disposed on a connection path between the first power supply end and the coil or on the ground, and since the output voltage of the first power supply end is generally higher than the working voltage of the switch control module, such as communication, the switch control module is disposed on the ground more safely.
When the power supply is started, the switch control module is used for carrying out on-off control on the grounding branch, the switch control module can be connected with an IO port of the DC-DC conversion circuit, data are collected through the IO port, and the output state of the DC-DC conversion circuit is judged, so that coil power supply or open circuit control is realized, when the switch control module is in a stable state, the switch control module enables the grounding branch to conduct power on stably, and when the switch control module is not in the stable state, the grounding branch is in an open circuit state, and the coil is not powered on.
In a specific embodiment, the switch control module is a field effect switch circuit, and the DC-DC conversion circuit comprises a second power supply terminal for supplying power to the field effect switch circuit.
Specifically, the field effect switch circuit is adopted to perform switch control, and the second power supply end of the DC-DC conversion circuit is utilized to perform driving, namely when the output of the DC-DC conversion circuit is stable, the first power supply end and the second power supply end of the DC-DC conversion circuit can realize power supply output, and when the field effect switch circuit reaches the power-on potential of the field effect switch circuit, the field effect switch circuit can realize the on-off of the grounding branch, so that the switch control requirement is met, no additional IO port is needed, meanwhile, no logic component is needed to perform data judgment, and the response is efficient and the cost is effectively controlled.
Namely, the traditional switch control module needs a logic judgment module connected with the IO and an on-off switch arranged on the grounding road, the field effect switch circuit design is adopted, the arrangement of the logic judgment module, the IO port and the on-off switch is omitted, the cost is obviously reduced, and meanwhile, more equipment space is not required to be occupied.
In a specific embodiment, a delay element is connected in parallel between two ends of the coil, the delay element is a diode D2, the delay element can implement a field effect switching circuit, when the relay is suddenly disconnected from the on state, a voltage peak higher than the supply voltage of the first supply end will be generated on the field effect switching circuit, and the diode D2 can provide a freewheeling circuit to release energy, so as to avoid high voltage breakdown of components of the field effect switching circuit.
In a specific embodiment, as shown in fig. 1, the field effect switch circuit includes a field effect transistor Q1 disposed on a ground connection, a drain electrode of the field effect transistor Q1 is connected to a coil, a capacitor C2 and a resistor R2 are connected in parallel between a source electrode and a gate electrode of the field effect transistor Q1, a resistor R1 is disposed between a connection point of the capacitor C2 and the gate electrode of the field effect transistor Q1 and a second power supply terminal, and a source electrode of the field effect transistor Q1 is grounded.
The resistance value of the resistor R2 is selectable, the resistor is connected across the gate-source electrode of the Q1 to play a role in preventing the gate potential of the Q1 from being interfered and conducting by mistake, the capacitor C2 is connected across the gate-source electrode of the Q1 in series, the R1 is connected between the upper end of the C2 and the second power supply end in the series, the resistance value is generally selected to be within 100 ohms, the current is provided for charging the C2, and when the voltage of the C2 reaches the gate threshold voltage, the Q1 can be conducted. The capacitance of C2 is selectable here, and is selected to be greater than 1uF for the purpose of delaying turn-on of Q1.
In one embodiment, the relay K1 is a packaged relay on a switching power supply, and the filter capacitor C1 is an aluminum electrolytic capacitor. Q1 is an N-channel enhancement mode field effect transistor.
The present invention will be described in detail with reference to fig. 2:
the circuit shown in fig. 1 is first constructed and consists of a relay K1, a diode D2, a field effect transistor Q1, a resistor R2 and a capacitor C2. The coil voltage of the relay K1 is obtained by +12V obtained by DC-DC conversion of a main loop, the grid driving signal of the switch tube Q1 is obtained by +12V obtained by the next stage DC-DC conversion and the obtained voltage is obtained by charging delay of R1 and C2.
At normal temperature, the power supply is started at the moment, C1 is short-circuited, the voltage is 0, the following stage +12V is not established, therefore, no +5V is used for driving Q1, Q1 is turned off, the relay is not attracted, K1 is turned off, the mains voltage is directly applied to two ends of the NTC, and surge current is generated to charge the capacitor C1 through the rectifier bridge D1. Since the resistance Resr of the NTC is large, such as 10Ω, at normal temperature, the surge current in this period has a maximum value of 310V/10Ω=31a. This value is smaller than the D1 maximum sustainable surge current IFSM. D1 may be protected.
The inrush current 31A begins to charge the capacitor C1, passing through about R ESR After a time of xc1=10Ω×22uf=0.22 mS, the voltage across C1 is sufficient to satisfy the voltage required for the subsequent DC-DC conversion to +12v. During this period, as the C1 capacitor charges more and more, the voltage gets closer to 310V after rectification, and the charging current gradually decreases from the initial 31A to the current required by the load (assuming the power supply is full of 500W, the large current through the NTC in steady state is about 500W/310 v=1.6a.
The time required for the subsequent +12v transform to get +5v is ignored. From the start of charging the C2 capacitor via R1 by +5v, after a period of r1×c2=100deg.OMEGA×10uf=1ms, the voltage across C1 reaches the threshold voltage (e.g., 3V) for Q1 gate drive, the switching tube Q1 starts to conduct, the relay coil current is 12v++120Ω=100deg.ma, the contact is closed to open K1, and the NTC is bypassed. Before this, the power supply has reached steady state, and a current of 1.6A flows through the relay. The relay driving loss was calculated to be about 12v×100 ma=1.2w. If there is no relay, the steady state current 1.6A produces a loss on the NTC (assuming NTC resistance at high temperature of 2Ω) of 1.6a×1.6a×2Ω=5.12W. It follows that adding a relay to short-circuit the NTC can reduce the NTC heat loss in steady state. Especially in the context of higher power switching power supplies. The larger the power of the power supply, the more obvious the effect of the relay on reducing loss.
If the power supply is operating steadily for a period of time, it is restarted quickly after being turned off suddenly (called hot start, which usually occurs when the PV voltage suddenly changes, or the power supply triggers some kind of protection at some time), the NTC is shorted before, the temperature is kept low, and the resistance is still around 10Ω. At warm start, the inrush current can still be suppressed at a lower level. If there is no relay, the NTC resistance is 2Ω or even lower at the time of hot start, and the surge current is calculated to be 310V/2Ω=155A. Such a large surge current is likely to burn out the diode beyond the bearing capacity of the diode, and high requirements are put on the type selection of the rectifier bridge.
In the circuit, the driving voltage +5V of the MOS switch tube Q1 for controlling the on-off of the relay coil is obtained from the post-stage DC-DC conversion, and is not converted by 310V at C1 alone. The advantage of this is that, for example, when the power supply on the DC side is not needed after the power supply on the AC side is started, the system processor will send an off command to turn off the DC-DC, and the voltages needed for turning off all loads, including 12V and 5V, are turned off naturally by the switching tube Q1, the relay contacts spring open naturally, no additional IO ports need to be added to turn off the Q1 alone, and no extra loss of the relay coil is caused because the Q1 cannot be turned off. If +12V and +5V are divided by the C1 voltage, the switch tube is always on as long as the AC voltage is still on even if the AC side power supply is already turned off, and the relay is always on, so that unnecessary loss is generated. Thus, the circuit design can be realized in multiple purposes.
Through the description, the control module can effectively inhibit surge current during hot start of the switching power supply, and damage to the rectifying device is avoided, so that the switching power supply is safer to operate. The bypass of the thermistor can be realized, thereby reducing the energy loss. The requirements of delay protection and the like are met, no additional control element is needed, and the circuit is simple and smart in constitution and stable and reliable in operation.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus/apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus/apparatus.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (7)
1. The control module for the hot start surge current of the switching power supply comprises an AC input end, a DC-DC conversion circuit and a rectification full bridge D1 positioned between the AC input end and the DC-DC conversion circuit, wherein a filter capacitor C1 is arranged between the rectification full bridge D1 and the DC-DC conversion circuit, and a thermistor NTC is arranged between the AC input end and the rectification full bridge D1, and is characterized in that:
the control module comprises a switch circuit connected with the thermistor NTC in parallel, a relay K1 arranged on the switch circuit, and a driving module for performing switch driving control on the relay K1 according to the output state of the DC-DC conversion circuit,
the relay K1 comprises a relay switch, a coil matched with the relay switch relatively and a power supply circuit electrically connected with the coil, and the driving module is arranged on the power supply circuit and electrically connected with the DC-DC conversion circuit.
2. The control module for a switching power supply to suppress hot start inrush current of claim 1, wherein:
the power supply circuit comprises a first power supply end arranged on the DC-DC conversion circuit, one end of the coil is connected with the first power supply end, the other end of the coil is provided with a grounding branch, and the driving module is a switch control module arranged on the grounding branch.
3. The control module for a switching power supply to suppress hot start inrush current of claim 2, wherein:
the switch control module is a field effect switch circuit, and the DC-DC conversion circuit comprises a second power supply end for supplying power to the field effect switch circuit.
4. A control module for a switching power supply to suppress hot start surge current as defined in claim 3, wherein:
a delay element is connected in parallel between the two ends of the coil.
5. The control module for a switching power supply to suppress hot start inrush current of claim 4, wherein:
the field effect switch circuit comprises a field effect transistor Q1 arranged on the grounding support, the drain electrode of the field effect transistor Q1 is connected with the coil, a capacitor C2 and a resistor R2 are connected in parallel between the source electrode and the grid electrode of the field effect transistor Q1,
a resistor R1 is arranged between the connection point of the capacitor C2 and the gate of the field effect transistor Q1 and the second power supply end, and the source of the field effect transistor Q1 is grounded.
6. The control module for a switching power supply to suppress hot start inrush current of claim 4, wherein:
the delay element is a diode D2.
7. The control module for a switching power supply to suppress hot start inrush current of claim 1, wherein:
the relay K1 is a packaging relay on the switching power supply, and the filter capacitor C1 is an aluminum electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310306519.1A CN116054549A (en) | 2023-03-27 | 2023-03-27 | Control module for suppressing hot start surge current of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310306519.1A CN116054549A (en) | 2023-03-27 | 2023-03-27 | Control module for suppressing hot start surge current of switching power supply |
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| CN116054549A true CN116054549A (en) | 2023-05-02 |
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| CN202310306519.1A Pending CN116054549A (en) | 2023-03-27 | 2023-03-27 | Control module for suppressing hot start surge current of switching power supply |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203406605U (en) * | 2013-08-14 | 2014-01-22 | 南宁市跃龙科技有限公司 | Control circuit for inhibiting surge current |
| CN217087507U (en) * | 2022-04-02 | 2022-07-29 | 深圳市南电创誉科技有限公司 | Switching power supply circuit capable of restraining surge current and switching power supply |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203406605U (en) * | 2013-08-14 | 2014-01-22 | 南宁市跃龙科技有限公司 | Control circuit for inhibiting surge current |
| CN217087507U (en) * | 2022-04-02 | 2022-07-29 | 深圳市南电创誉科技有限公司 | Switching power supply circuit capable of restraining surge current and switching power supply |
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Application publication date: 20230502 |