CN218733222U - Impulse current suppression circuit and switching power supply - Google Patents
Impulse current suppression circuit and switching power supply Download PDFInfo
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- CN218733222U CN218733222U CN202222008854.7U CN202222008854U CN218733222U CN 218733222 U CN218733222 U CN 218733222U CN 202222008854 U CN202222008854 U CN 202222008854U CN 218733222 U CN218733222 U CN 218733222U
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- 238000004146 energy storage Methods 0.000 claims abstract description 51
- 239000003990 capacitor Substances 0.000 claims description 104
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- 230000002401 inhibitory effect Effects 0.000 description 5
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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
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Abstract
The utility model relates to an impulse current suppression circuit and switching power supply, suppression circuit includes: a current limiter, a switch and a drive circuit; the first end of the current limiter is connected with the first end of the switch and then is used for being connected with the positive output end of the input power supply circuit, and the second end of the current limiter is connected with the second end of the switch and then is used for being connected with the positive end of the energy storage circuit; the third end of the switch is connected with the first end of the drive circuit; the second end of the driving circuit is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit, and the third end of the driving circuit is used for being connected with the second end of the rear-stage bridge circuit and the positive input end of the rear-stage topology circuit; and the fourth end of the driving circuit is used for being connected with a low-voltage power supply. The drive circuit is used for bootstrap driving to control the switch to be closed, so that the switch is synchronously closed when the rear stage works, and the switch is synchronously disconnected when the rear stage stops working.
Description
Technical Field
The utility model relates to a switching power supply field, in particular to impulse current suppression circuit and switching power supply.
Background
In the process of starting the switch power supply, the output of the switch power supply to the energy storage large capacitor can generate large impact current in the charging process. The pre-stage rectifying circuit or the PFC circuit has a limited capability of resisting a rush current, and if the rush current is not suppressed, the pre-stage circuit is easily damaged. The conventional surge current suppression circuit adopts a custom resistor or a thermistor which is connected in series in a charging loop, so that the circuit loss is large, and the circuit is only suitable for a low-power switching power supply. The medium and high power supply adopts a relay or a silicon controlled parallel current limiting resistor design, if the current limiting resistor is arranged at the low end, the ground of a large capacitor is easy to be unstable, if the current limiting resistor is arranged at the high end of an energy storage capacitor, the normal process needs to be isolated for driving, an isolation winding needs to be added, the circuit is complex, and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of prior art's not enough, the utility model provides an impulse current suppression circuit and switching power supply through drive circuit bootstrapping power supply drive, the switch ware can be closed with this back level work, and back level stop work and disconnection ensure that the secondary opens the machine and play the inhibitory action to impulse current.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
in a first aspect, an impulse current suppression circuit is provided, which is applied to a switching power supply, where the switching power supply includes an input power supply circuit, and an energy storage circuit, a rear-stage bridge circuit, and a rear-stage topology circuit that are connected in sequence; the suppression circuit includes: a current limiter, a switch and a drive circuit;
the first end of the current limiter is connected with the first end of the switch and then is used for being connected with the positive output end of the input power supply circuit, and the second end of the current limiter is connected with the second end of the switch and then is used for being connected with the positive end of the energy storage circuit and is used for limiting the charging current of the energy storage circuit;
the third end of the switch is connected with the first end of the driving circuit and is used for short-circuiting the current limiter after the energy storage circuit is charged;
the second end of the driving circuit is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit, and the third end of the driving circuit is used for being connected with the second end of the rear-stage bridge circuit and the positive input end of the rear-stage topology circuit; and the fourth end of the driving circuit is used for being connected with a low-voltage power supply.
Further, the driving circuit includes: the second resistor, the first diode, the second capacitor and the third capacitor; a first end of the second resistor is used as a first end of the driving circuit and is connected with a third end of the switch, and a second end of the second resistor is respectively connected with a cathode of the first diode and a first end of the second capacitor; the second end of the second capacitor is used as the second end of the driving circuit and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the anode of the first diode is respectively connected with the first end of the third capacitor and the cathode of the second diode; the second end of the third capacitor is used as the third end of the driving circuit and is used for being connected with the second end of the rear-stage bridge circuit and the input end of the rear-stage topology circuit; and the anode of the second diode is used as the fourth end of the driving circuit and is connected with a low-voltage power supply.
Furthermore, the driving circuit further comprises a third diode, and a cathode of the third diode is connected with the second end of the second resistor, the cathode of the first diode and the first end of the second capacitor; and the anode of the third diode is connected with the second end of the second capacitor and then serves as the second end of the driving circuit, and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit.
Further, the current limiter is a first resistor or a current limiting circuit, and the first circuit is a power resistor or a thermistor.
Further, the switch is an MOS tube, a silicon controlled rectifier, a relay or an IGBT.
In a second aspect, a switching power supply is provided, which includes an input power supply circuit, a tank circuit, a rear-stage bridge circuit, a rear-stage topology circuit, and the inrush current suppression circuit; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of the current limiter and the first end of the switch, and the negative output end of the input power supply circuit is respectively connected with the negative end of the energy storage circuit, the third end of the rear-stage bridge circuit and the negative input end of the rear-stage topology circuit;
the second end of the current limiter is connected with the second end of the switch, the positive end of the energy storage circuit, the second end of the driving circuit and the first end of the rear-stage bridge circuit in common;
the third end of the switch is connected with the first end of the rear-stage bridge circuit;
the second end of the rear-stage bridge circuit is connected with the third end of the driving circuit and the positive input end of the rear-stage topology circuit together, and is used for charging the driving circuit, so that the driving circuit provides driving voltage for the switch;
and the output end of the post-stage topological circuit is used for connecting an application load and performing power conversion.
Further, the rear-stage bridge circuit comprises a second switching tube and a third switching tube; the first end of the second switching tube is used as the first end of the rear-stage bridge circuit; a second end of the second switching tube and a second end of the third switching tube are connected together and then serve as a second end of the rear-stage bridge circuit; and the second end of the third switching tube is used as the third end of the rear-stage bridge circuit.
Further, the rear-stage topology circuit is an LLC topology circuit, a bridge topology circuit, a flyback topology circuit, or a forward topology circuit.
Furthermore, the input power supply circuit is an alternating current rectification circuit, a direct current input power supply circuit and a PFC power supply circuit, a positive output end of the input power supply circuit is used as a positive output end of the input power supply circuit, and a negative output end of the input power supply circuit is used as a negative output end of the input power supply circuit.
In a third aspect, an impulse current suppression circuit is provided, which is applied to a switching power supply, and includes an input power supply circuit, and an energy storage circuit, a rear-stage bridge circuit, and a rear-stage topology circuit that are connected in sequence; characterized in that the suppression circuit comprises: a current limiter, a switch and a drive circuit; the current limiter is a first resistor; the switch is a first switch tube; the driving circuit comprises a second resistor, a second capacitor, a third capacitor, a first diode, a second diode and a third diode; the first end of the first resistor is connected with the first end of the first switching tube and then is used for being connected with the positive output end of the input power supply circuit; the second end of the first resistor is connected with the second end of the first switching tube, the second end of the second capacitor and the anode of the third diode, and then is respectively used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the third end of the first switch tube is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the second capacitor, the cathode of the first diode and the cathode of the third diode; the anode of the first diode is connected with the first end of the third capacitor and the cathode of the second diode; the anode of the second diode is used for being connected with a low-voltage power supply; and the second end of the third capacitor is respectively used for being connected with the second end of the rear-stage bridge circuit and the input end of the rear-stage topological circuit.
In a fourth aspect, there is provided a switching power supply comprising: the circuit comprises an input power supply circuit, an energy storage circuit, a rear-stage bridge circuit, a rear-stage topology circuit and a suppression circuit, wherein the suppression circuit comprises a current limiter, a switch and a driving circuit; the energy storage circuit is a first capacitor; the current limiter is a first resistor; the driving circuit comprises a second resistor, a second capacitor, a third capacitor, a first diode, a second diode and a third diode; the switch is a first switch tube; the rear-stage bridge circuit comprises a second switching tube and a third switching tube; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of the first resistor and the first end of the first switch tube, and the negative output end of the input power supply circuit is respectively connected with the negative end of the first capacitor, the first end of the third switch tube and the positive input end of the rear-stage topology circuit; the second end of the first resistor is connected with the second end of the first switch tube, the positive end of the first capacitor, the second end of the second capacitor, the anode of the third diode and the first end of the second switch tube; the third end of the first switch tube is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the second capacitor, the cathode of the first diode and the cathode of the third diode; the anode of the first diode is connected with the first end of the third capacitor and the cathode of the second diode; the anode of the second diode is used for being connected with a low-voltage power supply; and the second end of the second switching tube is connected with the first end of the third switching tube, the second end of the third capacitor and the negative input end of the rear-stage topological circuit.
The theory of operation of this application will combine specific embodiment to describe, and the no longer repeated description here compares with prior art, the utility model discloses following beneficial effect has:
(1) The current limiter and the switch can be placed at the positive end of the energy storage circuit, so that the problem of unstable reference ground caused by voltage drop between the negative end of the energy storage circuit and the ground wire of the circuit when the current limiter and the switch are placed at the negative end can be solved;
(2) The driving circuit is simple, and an isolation driving transformer is not needed;
(3) The driving circuit is adopted to bootstrap and supply power for driving, the switch can be closed with the work of the subsequent stage, and the subsequent stage stops working and is disconnected, so that the secondary startup is ensured to play a role in inhibiting the impact current;
(4) The third diode is connected in parallel with two ends of the second capacitor, and can play a role in reverse breakdown clamping when the low-voltage power supply is overvoltage; when the rear stage stops working, the second capacitor is prevented from generating negative pressure due to reverse electric leakage of the first diode.
Drawings
Fig. 1 is a schematic block diagram of the inrush current suppression circuit of the present invention.
Fig. 2 is a specific circuit diagram of the surge current suppression circuit of the present invention.
Fig. 3 is a schematic block diagram of the inrush current suppression circuit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, in the present embodiment, an inrush current suppression circuit is provided, which is applied to a switching power supply, an input power supply circuit, and an energy storage circuit, a rear-stage bridge circuit, and a rear-stage topology circuit that are connected in sequence;
the suppression circuit includes: a current limiter, a switch and a drive circuit;
the first end of the current limiter is connected with the first end of the switch and then is used for being connected with the positive output end of the input power supply circuit, and the second end of the current limiter is connected with the second end of the switch and then is used for being connected with the positive end of the energy storage circuit and is used for limiting the charging current of the energy storage circuit; specifically, when the starting device is started, the power supply circuit is input to charge the energy storage circuit, the charging current is limited, and the device is prevented from being damaged by impact current in the starting charging process;
the third end of the switch is connected with the first end of the driving circuit and is used for short-circuiting the current limiter after the energy storage circuit is charged; specifically, after the energy storage circuit is charged, the current limiter is short-circuited, so that the current limiter is prevented from being damaged due to the fact that current passes through the current limiter for a long time when the secondary stage works;
the second end of the driving circuit is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit, and the third end of the driving circuit is used for being connected with the second end of the rear-stage bridge circuit and the positive input end of the rear-stage topology circuit; and the fourth end of the driving circuit is used for being connected with a low-voltage power supply. The driving circuit is used for raising the driving voltage by a low-voltage driving signal in a bootstrap mode and driving the switch to be closed.
As a specific embodiment of the driving circuit, the driving circuit includes:
the circuit comprises a second resistor R2, a first diode D2, a second diode D3, a second capacitor C2 and a third capacitor C3; a first end of a second resistor R2 is used as a first end of the driving circuit and is connected with a third end of the switch, and a second end of the second resistor R2 is respectively connected with a cathode of the first diode D2 and a first end of a second capacitor C2; the second end of the second capacitor C2 is used as the second end of the driving circuit and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the anode of the first diode D2 is connected to the first end of the third capacitor C3 and the cathode of the second diode D3, respectively; the second end of the third capacitor C3 is used as the third end of the driving circuit and is used for being connected with the second end of the rear-stage bridge circuit and the homonymous end of the primary winding of the input end of the rear-stage topological circuit; the anode of the second diode D3 serves as the fourth terminal of the driver circuit for connection to the low voltage supply SUP.
As a preferred embodiment of the driving circuit, the driving circuit further includes a third diode D4, and a cathode of the third diode D4 is connected to the second end of the second resistor R2, the cathode of the first diode D2, and the first end of the second capacitor C2; and the anode of the third diode D4 is connected with the second end of the second capacitor C2 and then serves as the second end of the driving circuit, and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit.
The third diode D4 is connected in parallel with two ends of the second capacitor C2, and can play a role in reverse breakdown clamping when the low-voltage power supply is overvoltage; when the rear stage stops working, the second capacitor C2 is prevented from generating negative pressure due to reverse electric leakage of the first diode D2.
As a specific embodiment of the current limiter, the current limiter is a first resistor R1 or a current limiting circuit, and the first circuit is a power resistor or a thermistor. When the machine is started, the input power supply circuit supplies power to the energy storage circuit, the current limiter limits the input current, and the peak value of the input charging current is limited below Vin/R1.
As a specific embodiment of the switch, the switch may be, but is not limited to, a MOS transistor, a thyristor, a relay, or an IGBT. After the energy storage circuit is charged, when the secondary circuit works, the current limiter is short-circuited by the switch, so that the current limiter is prevented from being lost or damaged due to the fact that input current passes through the current limiter in the working process of the secondary circuit.
In a specific implementation process, the switch is a first switch tube Q1.
In one embodiment, a current suppression circuit is provided and applied to a switching power supply, and the current suppression circuit comprises an input power supply circuit, and an energy storage circuit, a rear-stage bridge circuit and a rear-stage topology circuit which are connected in sequence; the suppression circuit includes: a current limiter, a switch and a drive circuit; the current limiter is a first resistor R1; the switch is a first switch tube Q1; the driving circuit comprises a second resistor R2, a second capacitor C2, a third capacitor C3, a first diode D2, a second diode D3 and a third diode D4; the first end of the first resistor R1 is connected with the first end of the first switching tube Q1 and then is used for being connected with the positive output end of the input power supply circuit; the second end of the first resistor R1 is connected with the second end of the first switching tube Q1, the second end of the second capacitor C2 and the anode of the third diode D4, and then respectively used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the third end of the first switching tube Q3 is connected with the first end of the second resistor R2; the second end of the second resistor R2 is connected with the first end of the second capacitor C2, the cathode of the first diode D2 and the cathode of the third diode D4; the anode of the first diode D2 is connected with the first end of the third capacitor C3 and the cathode of the second diode D3; the anode of the second diode D3 is used for being connected with a low-voltage power supply; and the second end of the third capacitor C3 is respectively used for being connected with the second end of the rear-stage bridge circuit and the input end of the rear-stage topology circuit.
In one embodiment, a switching power supply is provided, which comprises an input power supply circuit, a tank circuit, a rear-stage bridge circuit, a rear-stage topology circuit and a surge current suppression circuit as described above; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of the current limiter and the first end of the switch, and the negative output end of the input power supply circuit is respectively connected with the negative end of the energy storage circuit, the third end of the rear-stage bridge circuit and the negative input end of the rear-stage topology circuit;
the second end of the current limiter is connected with the second end of the switch, the positive end of the energy storage circuit, the second end of the driving circuit and the first end of the rear-stage bridge circuit in common;
the third end of the switch is connected with the first end of the rear-stage bridge circuit;
the second end of the rear-stage bridge circuit is connected with the third end of the driving circuit and the positive input end of the rear-stage topology circuit together, and is used for charging the driving circuit, so that the driving circuit provides driving voltage for the switch;
and the output end of the post-stage topological circuit is used for connecting an application load and performing power conversion. Specifically, the rear-stage topology circuit is used as a power conversion circuit of the switching power supply, and the function of converting input and output current and voltage is realized.
As a specific embodiment of the rear-stage bridge circuit, the rear-stage bridge circuit includes a second switching tube Q2 and a third switching tube Q3; the first end of the second switching tube Q2 is used as the first end of the rear-stage bridge circuit; the second end of the second switch tube Q2 and the second end of the third switch tube Q3 are connected together and then used as the second end of the rear-stage bridge circuit; the second terminal of the third switching tube Q3 is used as the third terminal of the bridge circuit in the next stage. And a second switching tube Q2 and a third switching tube Q3 of the rear-stage bridge circuit are alternately switched to lift and raise the voltage of a third capacitor C3, charge the second capacitor C2 and provide driving voltage for the switch.
As a specific embodiment of the later stage topology circuit, the later stage topology circuit may be, but is not limited to, an LLC topology circuit, a bridge topology circuit, a flyback topology circuit, a forward topology circuit, and other topology circuits of the switching power supply. The latter-stage topology circuit is used as a power conversion circuit of the switching power supply of the embodiment and is used for realizing the conversion function of input and output current and voltage.
As an embodiment of the input power supply circuit, the input power supply circuit may be, but is not limited to, an ac rectification circuit, a dc input power supply circuit, and a PFC power supply circuit, wherein a positive output terminal of the input power supply circuit is used as a positive output terminal of the input power supply circuit, and a negative output terminal of the input power supply circuit is used as a negative output terminal of the input power supply circuit. The purpose is to rectify the AC input into DC to supply power to the post-stage circuit.
In one embodiment, there is provided a switching power supply including: the circuit comprises an input power supply circuit, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D2, a second diode D3, a third diode D4, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a rear-stage topology circuit; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of a first resistor R1 and the first end of a first switching tube Q1, and the negative output end of the input power supply circuit is respectively connected with the negative end of a first capacitor C1, the first end of a third switching tube Q3 and the positive input end of a rear-stage topological circuit; the second end of the first resistor R1 is connected to the second end of the first switch Q1, the positive end of the first capacitor C1, the second end of the second capacitor C2, the first end of the second switch Q3, and the anode of the third diode D4; the third end of the first switching tube Q1 is connected with the first end of the second resistor R2; the second end of the second resistor R2 is connected with the first end of the second capacitor C2, the cathode of the first diode D2 and the cathode of the third diode D4; the anode of the first diode D2 is connected with the first end of the third capacitor C3 and the cathode of the second diode D3; the anode of the second diode D3 is used for being connected with a low-voltage power supply SUP; the second end of the second switching tube Q2 is connected with the first end of the third switching tube Q3, the second end of the third capacitor C3 and the negative input end of the rear-stage topology circuit.
In a specific implementation process, the input power supply circuit is a rectifier bridge D1, the rear-stage topology circuit is a transformer body T1, the current limiter is a first resistor R1, the switch is a first switching tube Q1, and the energy storage circuit is a first capacitor C1; that is, the switching power supply described in this embodiment includes: the transformer comprises a rectifier bridge D1, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D2, a second diode D3, a third diode D4, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a transformer body T1; the positive input end of the rectifier bridge D1 is used for being connected with an L line (the positive pole of a power supply system) of a power grid, the negative input end of the rectifier bridge D1 is used for being connected with an N line (the negative pole of the power supply system) of the power grid, the positive output end of the rectifier bridge D is respectively connected with the first end of the first resistor R1 and the first end of the first switching tube Q1, and the negative output end of the rectifier bridge D is respectively connected with the negative end of the first capacitor C1, the first end of the third switching tube Q3 and the synonym end of a primary winding of the transformer body T1; the second end of the first resistor R1 is connected with the first end of the first switch tube Q1, the positive end of the first capacitor C1, the second end of the second capacitor C2 and the first end of the second switch tube Q2; the third end of the first switching tube Q1 is connected with the first end of the second resistor R2; the second end of the second resistor R2 is connected with the first end of the second capacitor C2 and the cathode of the first diode D2; the anode of the first diode D2 is connected with the first end of the third capacitor C3 and the cathode of the second diode D3; the anode of the second diode D3 is used for connecting with the low-voltage power supply SLP; the second end of the second switching tube Q2 is connected to the first end of the third switching tube Q3, the second end of the third capacitor C3, and the dotted end of the primary winding of the transformer body T1.
The working principle of the embodiment is as follows:
when the machine is started, the rear-stage bridge circuit does not work, the rear-stage second switching tube Q2 and the rear-stage third switching tube Q3 are disconnected, the first switching tube Q1 is not driven and is in a disconnected state, the input current passes through the rectifier bridge D1 and charges the energy storage circuit through the current-limiting first resistor R1, the first resistor R1 plays a role in inhibiting the input impact current, and therefore the peak value of the input charging current is limited below Vin/R1; the first resistor R1 plays a role in limiting current, and the energy storage circuit is a first capacitor C1;
when the voltage of the first capacitor C1 rises to the starting voltage of the rear-stage bridge circuit, the rear-stage bridge circuit starts to operate. When the second switching tube Q2 is disconnected and the third switching tube Q3 is closed, the drain potential of the third switching tube Q3 is pulled down, and the low-voltage power supply SUP supplies power to the third capacitor C3 through the second diode D3, wherein the third capacitor C3 is a bootstrap capacitor; after the rear-stage third switching tube Q3 is disconnected, the second switching tube Q2 is closed, the potential platform of the drain electrode of the second switching tube Q3 is higher than the anode potential of the first capacitor C1, the third capacitor C3 supplies power to the second capacitor C2 through the first diode D2, and drives the first switching tube Q1 to be closed through the second resistor R2, so that the purpose that the driving voltage is raised by a low-voltage driving signal in a bootstrap mode, and the first switching tube Q1 is driven to be closed is achieved; after charging is completed and a rear-stage circuit works, the first resistor R1 is short-circuited by the first switching tube Q1, and the input power supply circuit supplies power through the first switching tube Q1, so that loss or damage to the first resistor R1 caused by input current passing through the first resistor R1 in the working process of the rear-stage circuit is prevented; wherein, the first diode D2 plays a role of rectification, and the second capacitor C2 plays a role of filtering. When the second switch tube Q2 of the rear stage is disconnected again, the third switch tube Q3 is closed, the low-voltage power supply SUP supplies power to the third capacitor C3 through the second diode D3, the second capacitor C2 continuously drives the first switch tube Q1 through the second resistor R2, and the operation is repeated in this way, so that the normally closed state of the first switch tube Q1 in the working process of the rear-stage bridge circuit is maintained, and the purpose is to alternately switch the second switch tube Q2 and the third switch tube Q3 to raise the voltage of the third capacitor C3 and supply power to the second capacitor C2, so that the bootstrap function driven by low voltage is realized. When the rear-stage bridge circuit stops working, the third capacitor C3 stops supplying power to the second capacitor C2, the second capacitor C2 consumes energy, the first switch tube Q1 stops being driven, and therefore when starting next time, the second resistor R2 can play a role in inhibiting the impact current again, the switch can be closed with the rear-stage bridge circuit, the rear-stage bridge circuit stops working and is disconnected, and secondary starting is guaranteed to play a role in inhibiting the impact current.
Specifically, the third diode D4 may be a voltage regulator tube or a common diode, and is more preferable as a voltage regulator tube; when the voltage of the low-voltage power supply terminal SUP is higher than the maximum driving voltage of the first switching tube Q1, the voltage can be stabilized by clamping through the third diode D4, and the gate of the first switching tube Q1 is prevented from being broken by overvoltage. Because the diode should actually be in-process, can't accomplish absolute stop, when the rear bridge circuit stop work, the condition of electric leakage probably appears in first diode D1, lead to second electric capacity C2 to appear the negative pressure, lead to first switch tube Q1's grid negative pressure to damage, thereby third diode D3 can be in rear bridge circuit stop work, when first diode D1 appears the electric leakage, forward conduction, the voltage of clamp second electric capacity C2, can avoid first switch tube Q1's grid negative pressure to damage.
The above description of the embodiments is only for the purpose of helping understanding the inventive concept of the present application, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made by those of ordinary skill in the art without departing from the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An impact current suppression circuit is applied to a switching power supply, and the switching power supply comprises an input power supply circuit, and an energy storage circuit, a rear-stage bridge circuit and a rear-stage topology circuit which are sequentially connected; wherein the suppression circuit comprises: a current limiter, a switch and a drive circuit;
the first end of the current limiter is connected with the first end of the switch and then is used for being connected with the positive output end of the input power supply circuit, and the second end of the current limiter is connected with the second end of the switch and then is used for being connected with the positive end of the energy storage circuit and is used for limiting the charging current of the energy storage circuit;
the third end of the switch is connected with the first end of the driving circuit and is used for short-circuiting the current limiter after the energy storage circuit is charged;
the second end of the driving circuit is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit, and the third end of the driving circuit is used for being connected with the second end of the rear-stage bridge circuit and the positive input end of the rear-stage topology circuit; and the fourth end of the driving circuit is used for being connected with a low-voltage power supply.
2. The inrush current suppression circuit of claim 1, wherein the drive circuit comprises:
the second resistor, the first diode, the second capacitor and the third capacitor; a first end of the second resistor is used as a first end of the driving circuit and is connected with a third end of the switch, and a second end of the second resistor is respectively connected with a cathode of the first diode and a first end of the second capacitor; the second end of the second capacitor is used as the second end of the driving circuit and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the anode of the first diode is respectively connected with the first end of the third capacitor and the cathode of the second diode; the second end of the third capacitor is used as the third end of the driving circuit and is used for being connected with the second end of the rear-stage bridge circuit and the input end of the rear-stage topology circuit; and the anode of the second diode is used as the fourth end of the driving circuit and is connected with a low-voltage power supply.
3. The inrush current suppression circuit of claim 2, wherein the driver circuit further comprises a third diode, a cathode of the third diode being coupled to the second terminal of the second resistor, the cathode of the first diode, and the first terminal of the second capacitor; and the anode of the third diode is connected with the second end of the second capacitor and then serves as the second end of the driving circuit, and is used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit.
4. The inrush current suppression circuit of claim 1, wherein the current limiter is a first resistor or a current limiting circuit, and the first resistor is a power resistor or a thermistor; the switch is an MOS tube, a controllable silicon, a relay or an IGBT.
5. A switching power supply comprising an input supply circuit, a tank circuit, a post-bridge circuit, a post-topology circuit, and a rush current suppression circuit as claimed in any one of claims 1 to 4; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of the current limiter and the first end of the switch, and the negative output end of the input power supply circuit is respectively connected with the negative end of the energy storage circuit, the third end of the rear-stage bridge circuit and the negative input end of the rear-stage topology circuit;
the second end of the current limiter is connected with the second end of the switch, the positive end of the energy storage circuit, the second end of the driving circuit and the first end of the rear-stage bridge circuit;
the third end of the switch is connected with the first end of the rear-stage bridge circuit;
the second end of the rear-stage bridge circuit is connected with the third end of the driving circuit and the positive input end of the rear-stage topology circuit together, and is used for charging the driving circuit, so that the driving circuit provides driving voltage for the switch;
and the output end of the post-stage topological circuit is used for connecting an application load and performing power conversion.
6. The switching power supply according to claim 5, wherein the rear stage bridge circuit comprises a second switching tube and a third switching tube; the first end of the second switch tube is used as the first end of the rear-stage bridge circuit; a second end of the second switching tube and a second end of the third switching tube are connected together and then serve as a second end of the rear-stage bridge circuit; and the second end of the third switching tube is used as the third end of the rear-stage bridge circuit.
7. The switching power supply according to claim 5, wherein the post-stage topology circuit is an LLC topology circuit, a bridge topology circuit, a flyback topology circuit, or a forward topology circuit.
8. The switching power supply according to claim 5, wherein the input power supply circuit is an AC rectification circuit, a DC input power supply circuit, or a PFC power supply circuit, and a positive output terminal of the input power supply circuit is used as a positive output terminal of the input power supply circuit, and a negative output terminal of the input power supply circuit is used as a negative output terminal of the input power supply circuit.
9. An impact current suppression circuit is applied to a switching power supply and comprises an input power supply circuit, an energy storage circuit, a rear-stage bridge circuit and a rear-stage topology circuit, wherein the energy storage circuit, the rear-stage bridge circuit and the rear-stage topology circuit are sequentially connected; wherein the suppression circuit comprises: a current limiter, a switch and a drive circuit; the current limiter is a first resistor; the switch is a first switch tube; the driving circuit comprises a second resistor, a second capacitor, a third capacitor, a first diode, a second diode and a third diode; the first end of the first resistor is connected with the first end of the first switching tube and then is used for being connected with the positive output end of the input power supply circuit; the second end of the first resistor is connected with the second end of the first switching tube, the second end of the second capacitor and the anode of the third diode, and then is respectively used for being connected with the positive end of the energy storage circuit and the first end of the rear-stage bridge circuit; the third end of the first switch tube is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the second capacitor, the cathode of the first diode and the cathode of the third diode; the anode of the first diode is connected with the first end of the third capacitor and the cathode of the second diode; the anode of the second diode is used for being connected with a low-voltage power supply; and the second end of the third capacitor is respectively used for being connected with the second end of the rear-stage bridge circuit and the input end of the rear-stage topological circuit.
10. A switching power supply, comprising: the circuit comprises an input power supply circuit, an energy storage circuit, a rear-stage bridge circuit, a rear-stage topology circuit and a suppression circuit, wherein the suppression circuit comprises a current limiter, a switch and a driving circuit; the energy storage circuit is a first capacitor; the current limiter is a first resistor; the driving circuit comprises a second resistor, a second capacitor, a third capacitor, a first diode, a second diode and a third diode; the switch is a first switch tube; the rear-stage bridge circuit comprises a second switching tube and a third switching tube; the positive input end of the input power supply circuit is used for being connected with the positive electrode of a power supply system, the negative input end of the input power supply circuit is used for being connected with the negative electrode of the power supply system, the positive output end of the input power supply circuit is respectively connected with the first end of the first resistor and the first end of the first switch tube, and the negative output end of the input power supply circuit is respectively connected with the negative end of the first capacitor, the first end of the third switch tube and the positive input end of the rear-stage topology circuit; the second end of the first resistor is connected with the second end of the first switch tube, the positive end of the first capacitor, the second end of the second capacitor, the anode of the third diode and the first end of the second switch tube; the third end of the first switch tube is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the second capacitor, the cathode of the first diode and the cathode of the third diode; the anode of the first diode is connected with the first end of the third capacitor and the cathode of the second diode; the anode of the second diode is used for being connected with a low-voltage power supply; and the second end of the second switching tube is connected with the first end of the third switching tube, the second end of the third capacitor and the negative input end of the post-stage topology circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022209095882 | 2022-04-19 | ||
| CN202220909588 | 2022-04-19 |
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| Publication Number | Publication Date |
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| CN218733222U true CN218733222U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222008854.7U Active CN218733222U (en) | 2022-04-19 | 2022-07-30 | Impulse current suppression circuit and switching power supply |
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| Country | Link |
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| CN (1) | CN218733222U (en) |
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2022
- 2022-07-30 CN CN202222008854.7U patent/CN218733222U/en active Active
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