CN113162382A - Surge current suppression circuit - Google Patents

Surge current suppression circuit Download PDF

Info

Publication number
CN113162382A
CN113162382A CN202110430418.6A CN202110430418A CN113162382A CN 113162382 A CN113162382 A CN 113162382A CN 202110430418 A CN202110430418 A CN 202110430418A CN 113162382 A CN113162382 A CN 113162382A
Authority
CN
China
Prior art keywords
resistor
circuit
switching tube
diode
switch
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.)
Granted
Application number
CN202110430418.6A
Other languages
Chinese (zh)
Other versions
CN113162382B (en
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mornsun Guangzhou Science and Technology Ltd
Original Assignee
Mornsun Guangzhou Science and Technology Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mornsun Guangzhou Science and Technology Ltd filed Critical Mornsun Guangzhou Science and Technology Ltd
Priority to CN202110430418.6A priority Critical patent/CN113162382B/en
Publication of CN113162382A publication Critical patent/CN113162382A/en
Application granted granted Critical
Publication of CN113162382B publication Critical patent/CN113162382B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

The invention provides a surge current suppression circuit, which comprises a constant current circuit, a bias circuit and a detection circuit, wherein the constant current circuit is used for detecting and adjusting output current and maintaining the output current to be a constant value, the detection circuit is used for detecting the potential difference of a capacitor to a reference ground terminal, and when the potential difference of the two terminals is smaller than a set value, a switching tube of a switching circuit is automatically closed to complete a starting time sequence. By adopting the constant current circuit, the starting circuit can generate approximately constant output current under the high and low voltage input condition, the capacitor is charged, and input surge current suppression and rapid circuit starting are realized.

Description

Surge current suppression circuit
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a surge current suppression circuit of a switching power supply.
Background
The switching power supply device is in a short-circuit state at the moment of being connected to the ac power grid, and draws a huge pulse current from the ac power grid, which is called surge current. The current value is far larger than the normal working current, so that the current value causes great impact on an alternating current power grid, the false operation of a protection switch of the alternating current power grid is easily triggered, and the normal power supply of the alternating current power grid is influenced. Meanwhile, the huge transient surge current also has negative influence on the reliability and the service life of devices such as a rectifier bridge, an electrolytic capacitor, a power semiconductor and the like in the switch power supply.
At present, in a low-power application occasion, due to cost and volume, a thermistor (NTC) is generally used to be connected in series into a circuit, and the negative temperature characteristic of the thermistor is utilized to suppress surge current at the moment of starting, and the schematic block diagram is shown in figure 1. In the medium and high power application, because the input current is relatively large, in order to reduce the loss of the suppressed device, a scheme that a relay is connected in parallel with a resistor or a semiconductor switching tube is connected in parallel with the resistor is often used, and the schematic block diagram of the scheme is shown in fig. 2 and fig. 3.
The thermistor solution has the following disadvantages: the thermistor is connected in series in the circuit, and after the circuit normally works, although the resistance value can be greatly reduced, the heat loss still exists, and the efficiency of the power supply is influenced. Meanwhile, in a low-temperature environment, the resistance value of the thermistor can be greatly increased, so that the thermistor is not beneficial to starting under the conditions of low voltage and low temperature, and in a high-temperature environment, the resistance value can be reduced, and the capability of restraining surge current can be greatly reduced.
The parallel connection scheme of the relay and the resistor has the following defects: as is well known, a relay is a mechanical device, in which, as the number of times of operation of contacts increases, the oxidation of the contacts increases the impedance, and the mechanical relay is inferior in volume and service life and generates mechanical noise during operation. Secondly, the control logic of the relay is relatively complex, and often additional circuits such as a timer and a voltage comparator are used in cooperation.
The scheme of connecting the semiconductor switch tube and the resistor in parallel replaces a mechanical relay with a power semiconductor switch device, and solves the problems of mechanical service life of the relay and oxidation defects of a contact. However, the following disadvantages also exist: when the power is on, the surge current is restrained only by the parallel branch circuit resistor. Because the resistance value of the parallel branch circuit is a constant value, the charging time sequence of the whole circuit follows the equation of RC charging and discharging:
Figure BDA0003031246410000011
as can be seen from the equation, the exponent value can only be infinitely close to 0, but never equals 0, so that an infinite time value is required for the capacitor to completely fill.
When t is RC, Ut is 0.63 Vu;
when t is 2RC, Ut is 0.86 Vu;
when t is 3RC, Ut is 0.95 Vu;
when t is 4RC, Ut is 0.98 Vu;
when t is 5RC, Ut is 0.99 Vu.
As can be derived from the above equation, the charging process is basically finished after 3-5 RC operations are required. When the voltage across the capacitor reaches Ut 0.63Vu, the charging time increases exponentially in the subsequent timing, but the voltage across the capacitor rises slowly, as shown in fig. 4. Through the above analysis, it can be seen that the biggest disadvantage of this scheme is that the charging time of the capacitor is too long, which results in slow start-up of the subsequent circuit. In many applications, to meet the requirement of the starting time, the resistance of the parallel branch needs to be reduced, which in turn weakens the surge current suppression capability and cannot achieve both advantages.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a surge current suppression circuit, which charges a capacitor by using a constant current circuit, so that the voltage at two ends of the capacitor and the charging time follow an equation: ut is T I/C, namely the voltage at two ends of the capacitor is increased in linear proportion to the charging time, so that the input surge current is restrained and the circuit is started quickly.
The technical scheme provided by the invention is as follows:
an inrush current suppression circuit, characterized in that: the circuit comprises a constant current circuit, a detection circuit and a switch circuit, wherein the constant current circuit is connected in series with the anode of a capacitor or the cathode of the capacitor, the input end of the detection circuit is connected with the output end of the constant current circuit, the output end of the detection circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the input end of the constant current circuit, the constant current circuit is used for detecting and adjusting the charging current of the capacitor, the detection circuit is used for detecting the potential difference of the capacitor to a reference ground, and when the potential difference at the two ends is smaller than a set value, a switch tube of the switch circuit is controlled to be closed and conducted to complete a starting time sequence.
As a specific embodiment of the above constant current circuit, the constant current circuit includes: the constant current circuit comprises a switching tube Q1, a switching tube Q2, a resistor R1 and a resistor R2, wherein the drain electrode of the switching tube Q1 is the output end of the constant current circuit, the source electrode of the switching tube Q1 is connected with the base electrode of the switching tube Q2 and one end of the resistor R2, the grid electrode of the switching tube Q1 is connected with the collector electrode of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is the input end of the constant current circuit, and the other end of the resistor R2 and the emitter electrode of the switching tube Q2 are connected with the ground GND.
As a specific embodiment of the detection circuit, the detection circuit is characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, wherein the collector of the switch tube Q4 is the output end of the detection circuit, the emitter of the switch tube Q4 is connected with a reference ground GND, the base of the switch tube Q4 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with one end of the resistor R4, and the other end of the resistor R4 is the input end of the detection circuit.
As a specific embodiment of the above switching circuit, the switching circuit is characterized in that: the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3, wherein the grid electrode of the switch tube Q3 is connected with the cathode of the diode D2 and one end of a resistor R3, the other end of the resistor R3 is the output end of the switch circuit, the source electrode of the switch tube Q3 and the anode of the diode D2 are connected with the ground GND, and the drain electrode of the switch tube Q3 is the input end of the switch circuit.
Preferably, the gate driving voltages of the switching tube Q1 and the switching tube Q3 are provided by a direct current voltage input terminal HVDC.
Preferably, the gate driving voltages of the switching tube Q1 and the switching tube Q3 are provided by an external gate driving voltage input terminal GS-1.
Preferably, the gate driving voltage of the switching tube Q1 is provided by a direct-current voltage input terminal HVDC, and the gate driving voltage of the switching tube Q3 is provided by an external gate driving voltage input terminal GS-2.
As a first embodiment of the inrush current suppression circuit, the inrush current suppression circuit is characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
a drain of the switching tube Q1 is connected to a cathode of the capacitor C1, a source of the switching tube Q1 is connected to a base of the switching tube Q2 and one end of the resistor R2, a gate of the switching tube Q1 is connected to a collector of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is connected to the dc voltage input terminal HVDC, the other end of the resistor R2 and an emitter of the switching tube Q2 are connected to the ground GND, a gate of the switching tube Q3 is connected to a cathode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to the dc voltage input terminal HVDC, a source of the switching tube Q3 and an anode of the diode D2 are connected to the ground GND, a drain of the switching tube Q3 is connected to a cathode of the capacitor C1, a collector of the switching tube Q4 is connected to a cathode of the diode D2, an emitter of the switching tube Q4 is connected to the ground, a base of the switching tube Q4 is connected to the anode of the diode D4, and one end of the resistor R4 is connected to GND, the other end of the resistor R4 is connected to the negative electrode of the capacitor C1.
As a second embodiment of the inrush current suppression circuit, the inrush current suppression circuit is characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
the drain of the switching tube Q1 is connected with the negative electrode of the capacitor C1, the source of the switching tube Q1 is connected with the base of the switching tube Q2 and one end of the resistor R2, the gate of the switching tube Q1 is connected with the collector of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is connected with the external gate drive voltage input terminal GS-1, the other end of the resistor R2 and the emitter of the switching tube Q2 are connected with the ground GND, the gate of the switching tube Q3 is connected with the cathode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected with the external gate drive voltage input terminal GS-1, the source of the switching tube Q3 and the anode of the diode D2 are connected with the ground GND, the drain of the switching tube Q3 is connected with the negative electrode of the capacitor C1, the collector of the switching tube Q4 is connected with the cathode of the diode D2, the emitter of the switching tube Q56 is connected with the ground 82 4, the base of the diode D1 is connected with the ground GND 1, the cathode of the diode D1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the cathode of the capacitor C1.
As a third embodiment, the surge current suppressing circuit is characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
the drain of a switch tube Q1 is connected with a direct current voltage input end HVDC, the source of a switch tube Q1 is connected with one end of a resistor R2, the other end of the resistor R2, the base of a switch tube Q2 and the emitter of a switch tube Q2 are connected with the anode of a capacitor C1, the collector of a switch tube Q2 is connected with the grid of a switch tube Q1 and one end of a resistor R1, the other end of the resistor R1 is connected with the direct current voltage input end HVDC, the drain of a switch tube Q3 is connected with the direct current voltage input end HVDC, the grid of a switch tube Q3 is connected with the cathode of a diode D2 and one end of a resistor R3, the other end of a resistor R3 is connected with an external grid driving voltage GS input end-2, the source of a switch tube Q3 and the anode of a diode D2 are connected with a reference ground GND-1, the collector of a switch tube Q4 is connected with the cathode of a diode D2, the emitter of a switch tube Q4 is connected with a GND-1, the base of a resistor Q4 is connected with a GND 4, one end of the resistor R4 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the dc voltage input terminal HVDC.
The core concept of the invention is to use a constant current circuit to replace a conventional RC circuit to charge a capacitor, and a detection circuit and a switch circuit are assisted. When the power is on, the constant current circuit outputs constant current to charge the capacitor, so that the voltage at two ends of the capacitor is increased in linear proportion to the charging time; when the detection circuit detects that the voltage difference of the capacitor to the reference ground is less than a set value, the switch tube in the switch circuit is automatically closed so as to reduce the loss of the circuit.
The working principle of the present invention will be analyzed with reference to the specific embodiments, which are not described herein. The invention has the following beneficial effects:
(1) long service life, low power consumption and no mechanical noise
The switch tube is used for replacing a mechanical relay, the problems of non-contact oxidation and mechanical noise caused by limitation of the service life of the action times of the mechanical switch are solved, the driving power consumption of a switch device is lower, and the driving current is only in the mu A level and is far lower than the mA level of the mechanical relay.
(2) Flexible setting of charging current
The output current of the constant current circuit can be flexibly set according to different starting time requirements and capacitance values of the capacitor, and the value of the current output by the constant current circuit can be changed by changing the value of the resistor R2.
(3) Quick start of circuit
The constant-current charging mode is adopted for the circuit capacitor, the switching tube Q1 works in an amplification area before the post-stage circuit is started, the impedance in the field effect tube can be automatically adjusted according to the voltage difference between the negative electrode of the output capacitor C1 and the reference ground end GND, the output current is kept constant, and the linear proportional increase of the capacitor voltage and the charging time is realized.
(4) Simple circuit structure
The circuit only comprises 3 simple unit circuits to form a complete closed-loop control system, and can realize the logic time sequence of constant control of charging current and automatic on-off control of a switching circuit without using a complex timer, a current amplifier and a voltage comparator circuit.
Drawings
FIG. 1 is a schematic block diagram of an NTC scheme;
FIG. 2 is a schematic block diagram of a parallel arrangement of relay resistors;
FIG. 3 is a schematic block diagram of a semiconductor switch tube resistor parallel scheme;
FIG. 4 is a timing diagram of RC charging for the semiconductor switch tube resistor parallel scheme;
fig. 5 is a circuit schematic diagram of a first embodiment of an inrush current suppression circuit of the present invention;
fig. 6 is a timing diagram illustrating constant current charging of a capacitor in accordance with the first embodiment of the inrush current suppression circuit of the present invention;
fig. 7 is a circuit schematic diagram of a second embodiment of an inrush current suppression circuit of the present invention;
fig. 8 is a circuit schematic diagram of a third embodiment of an inrush current suppression circuit of the present invention;
description of the reference numerals
The base and collector turn-on voltages (about 0.6-0.7V) of the VBE triode;
an HVDC direct current voltage input;
GND is referenced to ground;
voltage values at any time at two ends of the Ut capacitor;
i, working current of the constant current circuit;
t, charging time of the constant current circuit;
GS-1 the second embodiment has an external gate drive voltage input terminal;
GS-2 the third embodiment has a gate drive voltage input terminal;
GND-1 referenced to ground;
the voltage regulation value of the VZ Zener diode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
First embodiment
As shown in fig. 5, an inrush current suppression circuit for suppressing an input inrush current and rapidly starting the circuit includes: the constant current circuit 101, the detection circuit 102 and the switch circuit 103, the constant current circuit 101 is connected in series between the dc voltage input terminal HVDC and the negative electrode of the capacitor C1, the input terminal of the detection circuit 102 is connected with the output terminal of the constant current circuit 101, the output terminal of the detection circuit 102 is connected with the input terminal of the switch circuit 103, the output terminal of the switch circuit 103 is connected with the input terminal of the constant current circuit 101, the constant current circuit 101 is used for detecting and adjusting the charging current of the capacitor C1, the detection circuit 102 is used for detecting the potential difference of the negative electrode of the capacitor C1 to the reference ground, and when the potential difference between the two terminals is smaller than a set value, the switch tube of the switch circuit is controlled to be closed and conducted to complete the starting sequence.
The constant current circuit 101 comprises a switching tube Q1, a switching tube Q2, a resistor R1 and a resistor R2, wherein the drain of the switching tube Q1 is the output end of the constant current circuit 101, the source of the switching tube Q1 is connected with the base of the switching tube Q2 and one end of the resistor R2, the gate of the switching tube Q1 is connected with the collector of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is the input end of the constant current circuit 101, and the other end of the resistor R2 and the emitter of the switching tube Q2 are connected with the ground GND.
The switching tube Q1 is a field effect tube, adopts a common source connection method, and correspondingly can adopt IGBT and triode power devices for equivalent substitution; the switching tube Q2 is an NPN triode and adopts a common emitter connection method; when activated, both the transistor Q1 and the transistor Q2 operate in the amplification region.
The detection circuit 102 comprises a switch tube Q4, a resistor R4 and a diode D1, wherein a collector of the switch tube Q4 is an output end of the detection circuit 102, an emitter of the switch tube Q4 is connected with a ground GND, a base of the switch tube Q4 is connected with an anode of a diode D1, a cathode of the diode D1 is connected with one end of the resistor R4, and the other end of the resistor R4 is an input end of the detection circuit 102.
The switching tube Q4 is an NPN triode, and a common emitter connection method is adopted, so that a field effect tube can be equivalently replaced according to the requirements of the switching power supply product.
The switch circuit 103 comprises a resistor R3, a diode D2 and a switch tube Q3, wherein the gate of the switch tube Q3 is connected with the cathode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is the output end of the switch circuit 103, the source of the switch tube Q3 and the anode of the diode D2 are connected with the ground GND, and the drain of the switch tube Q3 is the input end of the switch circuit 103.
The switching tube Q3 is a field effect tube, adopts a common source connection method, and correspondingly can adopt IGBT and triode power devices for equivalent substitution; before the constant current circuit finishes a charging sequence, the switching tube Q3 works in a cut-off region; when the constant current circuit completes the charging sequence, the switching tube Q3 works in the saturation region.
The working principle of the invention is as follows:
after the circuit is powered on, a direct-current voltage input end HVDC provides a gate bias voltage for a switching tube Q1 in the constant-current circuit 101, when the gate voltage of a switching tube Q1 is built and reaches a threshold of a starting voltage required by the switching tube Q1, the constant-current circuit 101 starts to work, a constant current is output to form a closed loop from a resistor R1 and a resistor R2 to a reference ground GND, meanwhile, the potential difference between the base of the switching tube Q2 and the two ends of a collector detection resistor R2 is detected, when the potential difference between the two ends of the resistor R2 exceeds the VBE threshold of the switching tube Q2, the switching tube Q2 starts to enter an amplification area, the circuit follows the magnitude of the detection current value, the gate driving voltage of the switching tube Q1 is adjusted, the switching tube Q1 works in the amplification area, the internal impedance is automatically adjusted, and the constant current output of the circuit is maintained.
The current value output by the constant current circuit follows the following equation: i ═ VBE/R1, the output current of the constant current circuit can be set by modifying the parameters of the resistor R2.
Simultaneously, a direct-current voltage input end HVDC provides a grid bias voltage for a switch tube Q3 in the switch circuit 103 through a constant-current circuit and a resistor R3, at the beginning of electrification, the potential difference between the negative electrode of a capacitor C1 and a reference ground CND is larger than the critical breakdown voltage of a diode D1, the diode D1 is in a conducting state, the switch tube Q4 works in a saturation region, and the grid voltage of a switch tube Q3 is set to be at a low level and is in a cut-off state.
As the charging time increases, when the potential difference between the cathode of the capacitor C1 and the ground GND is smaller than a predetermined value, i.e., smaller than the critical breakdown voltage of the diode D1, the diode D1 is turned off, and the switching tube Q4 is turned off. The gate of the switching tube Q3 returns to high level, the switching tube Q3 works in a saturation region, and the surge suppression circuit completes the turn-on sequence.
The diode D1 is a Zener diode, and the threshold value of the switch circuit can be set by selecting the voltage stabilizing parameter value Vz of different Zener diodes D1.
The invention uses constant current charging mode to the circuit capacitor C1 to make the switch tube Q1 work in the amplifying region before the post-stage circuit is started, and can automatically adjust the impedance in the field effect tube according to the voltage difference between the negative electrode of the capacitor C1 and the ground GND, so as to keep the output current constant, and make the voltage at the two ends of the capacitor C1 and the charging time follow the equation: ut I/C, so that the capacitor voltage increases in linear proportion to the charging time, the charging timing diagram is shown in fig. 6.
Second embodiment
As shown in fig. 7, which is a schematic circuit diagram of the inrush current suppression circuit according to the present embodiment, the constant current circuit 101, the detection circuit 102, and the switch circuit 103 are provided, the constant current circuit 101 is connected in series between the dc voltage input terminal HVDC and the negative electrode of the capacitor C1, the input terminal of the detection circuit 102 is connected to the output terminal of the constant current circuit 101, the output terminal of the detection circuit 102 is connected to the input terminal of the switch circuit 103, and the output terminal of the switch circuit 103 is connected to the input terminal of the constant current circuit 101.
The present embodiment is different from the first embodiment in that the gate driving voltages of the switching transistor Q1 of the constant current circuit 101 and the switching transistor Q3 of the switching circuit are provided by the external gate driving voltage input terminal GS-1. The working principle of this embodiment is similar to that of the first embodiment, and is not described herein again.
Third embodiment
As shown in fig. 8, which is a schematic circuit diagram of the inrush current suppression circuit according to the present embodiment, the constant current circuit 101, the detection circuit 102, and the switch circuit 103 are provided, the constant current circuit 101 is connected in series between the dc voltage input terminal HVDC and the positive electrode of the capacitor C1, the input terminal of the detection circuit 102 is connected to the output terminal of the constant current circuit 101, the output terminal of the detection circuit 102 is connected to the input terminal of the switch circuit 103, and the output terminal of the switch circuit 103 is connected to the input terminal of the constant current circuit 101.
The present embodiment is different from the first embodiment in that the constant current circuit 101 is connected in series between the dc voltage input terminal HVDC and the positive electrode of the capacitor C1, and a set of isolated gate driving voltages GS-2 and GND-1 are added, the gate driving voltage of the switching tube Q1 in the constant current circuit 101 is provided by the dc voltage input terminal HVDC, and the gate driving voltage of the switching tube Q3 in the switching circuit 103 is provided by the external gate driving voltage input terminal GS-2, where GND-1 and GND are two different reference grounds.
The constant current circuit 101 is used for detecting and adjusting the charging current of the capacitor C1, the detection circuit 102 is used for detecting the potential difference of the positive electrode of the capacitor C1 to the reference ground CND, and when the potential difference between the two ends is smaller than a set value, the switching tube of the switching circuit is controlled to be closed and conducted, and the starting sequence is completed. Other working principles and details have been explained in detail in the first embodiment of the present invention, and are not described herein again.
The above embodiments are merely preferred embodiments of the present invention, and it should be noted that the above preferred embodiments should not be construed as limiting the present invention. In addition, it is obvious that several modifications and decorations can be made in the prior art without departing from the spirit and scope of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention, and are not repeated herein by the embodiment.

Claims (10)

1. An inrush current suppression circuit, characterized in that: the circuit comprises a constant current circuit, a detection circuit and a switch circuit, wherein the constant current circuit is connected in series with the anode of a capacitor or the cathode of the capacitor, the input end of the detection circuit is connected with the output end of the constant current circuit, the output end of the detection circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the input end of the constant current circuit, the constant current circuit is used for detecting and adjusting the charging current of the capacitor, the detection circuit is used for detecting the potential difference of the capacitor to a reference ground, and when the potential difference at the two ends is smaller than a set value, a switch tube of the switch circuit is controlled to be closed and conducted to complete a starting time sequence.
2. The inrush current suppression circuit of claim 1, wherein: the constant current circuit comprises a switching tube Q1, a switching tube Q2, a resistor R1 and a resistor R2, wherein the drain electrode of the switching tube Q1 is the output end of the constant current circuit, the source electrode of the switching tube Q1 is connected with the base electrode of the switching tube Q2 and one end of the resistor R2, the grid electrode of the switching tube Q1 is connected with the collector electrode of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is the input end of the constant current circuit, and the other end of the resistor R2 and the emitter electrode of the switching tube Q2 are connected with the ground GND.
3. The inrush current suppression circuit of claim 1, wherein: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, wherein the collector of the switch tube Q4 is the output end of the detection circuit, the emitter of the switch tube Q4 is connected with a reference ground GND, the base of the switch tube Q4 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with one end of the resistor R4, and the other end of the resistor R4 is the input end of the detection circuit.
4. The inrush current suppression circuit of claim 1, wherein: the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3, wherein the grid electrode of the switch tube Q3 is connected with the cathode of the diode D2 and one end of a resistor R3, the other end of the resistor R3 is the output end of the switch circuit, the source electrode of the switch tube Q3 and the anode of the diode D2 are connected with the ground GND, and the drain electrode of the switch tube Q3 is the input end of the switch circuit.
5. The inrush current suppression circuit of claim 2 or 4, wherein: the gate driving voltages of the switching tube Q1 and the switching tube Q3 are provided by a direct current voltage input terminal HVDC.
6. The inrush current suppression circuit of claim 2 or 4, wherein: the gate driving voltages of the switching tube Q1 and the switching tube Q3 are provided by an external gate driving voltage input end GS-1.
7. The inrush current suppression circuit of claim 2 or 4, wherein: the gate driving voltage of the switching tube Q1 is provided by a direct-current voltage input end HVDC, and the gate driving voltage of the switching tube Q3 is provided by an external gate driving voltage input end GS-2.
8. An inrush current suppression circuit, characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
a drain of the switching tube Q1 is connected to a cathode of the capacitor C1, a source of the switching tube Q1 is connected to a base of the switching tube Q2 and one end of the resistor R2, a gate of the switching tube Q1 is connected to a collector of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is connected to the dc voltage input terminal HVDC, the other end of the resistor R2 and an emitter of the switching tube Q2 are connected to the ground GND, a gate of the switching tube Q3 is connected to a cathode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to the dc voltage input terminal HVDC, a source of the switching tube Q3 and an anode of the diode D2 are connected to the ground GND, a drain of the switching tube Q3 is connected to a cathode of the capacitor C1, a collector of the switching tube Q4 is connected to a cathode of the diode D2, an emitter of the switching tube Q4 is connected to the ground, a base of the switching tube Q4 is connected to the anode of the diode D4, and one end of the resistor R4 is connected to GND, the other end of the resistor R4 is connected to the negative electrode of the capacitor C1.
9. An inrush current suppression circuit, characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
the drain of the switching tube Q1 is connected with the negative electrode of the capacitor C1, the source of the switching tube Q1 is connected with the base of the switching tube Q2 and one end of the resistor R2, the gate of the switching tube Q1 is connected with the collector of the switching tube Q2 and one end of the resistor R1, the other end of the resistor R1 is connected with the external gate drive voltage input terminal GS-1, the other end of the resistor R2 and the emitter of the switching tube Q2 are connected with the ground GND, the gate of the switching tube Q3 is connected with the cathode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected with the external gate drive voltage input terminal GS-1, the source of the switching tube Q3 and the anode of the diode D2 are connected with the ground GND, the drain of the switching tube Q3 is connected with the negative electrode of the capacitor C1, the collector of the switching tube Q4 is connected with the cathode of the diode D2, the emitter of the switching tube Q56 is connected with the ground 82 4, the base of the diode D1 is connected with the ground GND 1, the cathode of the diode D1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the cathode of the capacitor C1.
10. An inrush current suppression circuit, characterized in that: the detection circuit comprises a switch tube Q4, a resistor R4 and a diode D1, and the switch circuit comprises a resistor R3, a diode D2 and a switch tube Q3;
the drain of a switch tube Q1 is connected with a direct current voltage input end HVDC, the source of a switch tube Q1 is connected with one end of a resistor R2, the other end of the resistor R2, the base of a switch tube Q2 and the emitter of a switch tube Q2 are connected with the anode of a capacitor C1, the collector of a switch tube Q2 is connected with the grid of a switch tube Q1 and one end of a resistor R1, the other end of the resistor R1 is connected with the direct current voltage input end HVDC, the drain of a switch tube Q3 is connected with the direct current voltage input end HVDC, the grid of a switch tube Q3 is connected with the cathode of a diode D2 and one end of a resistor R3, the other end of a resistor R3 is connected with an external grid driving voltage GS input end-2, the source of a switch tube Q3 and the anode of a diode D2 are connected with a reference ground GND-1, the collector of a switch tube Q4 is connected with the cathode of a diode D2, the emitter of a switch tube Q4 is connected with a GND-1, the base of a resistor Q4 is connected with a GND 4, one end of the resistor R4 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the dc voltage input terminal HVDC.
CN202110430418.6A 2021-04-21 2021-04-21 Surge current suppression circuit Active CN113162382B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110430418.6A CN113162382B (en) 2021-04-21 2021-04-21 Surge current suppression circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110430418.6A CN113162382B (en) 2021-04-21 2021-04-21 Surge current suppression circuit

Publications (2)

Publication Number Publication Date
CN113162382A true CN113162382A (en) 2021-07-23
CN113162382B CN113162382B (en) 2023-06-06

Family

ID=76867656

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110430418.6A Active CN113162382B (en) 2021-04-21 2021-04-21 Surge current suppression circuit

Country Status (1)

Country Link
CN (1) CN113162382B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114629096A (en) * 2022-05-13 2022-06-14 河南新太行电源股份有限公司 Constant-current anti-surge starting circuit
CN117833187A (en) * 2024-03-04 2024-04-05 成都新欣神风电子科技有限公司 Surge voltage suppression circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148058A (en) * 2007-12-13 2009-07-02 Sanken Electric Co Ltd Active filter apparatus and power conversion apparatus
CN102969765A (en) * 2012-11-13 2013-03-13 深圳市博驰信电子有限责任公司 Constant-current constant-voltage charge control circuit
CN202997919U (en) * 2012-12-24 2013-06-12 成都芯源***有限公司 Ripple suppression circuit and power supply system thereof
JP2014117062A (en) * 2012-12-10 2014-06-26 Seiko Epson Corp Rush current suppression circuit, and power supply
CN107069688A (en) * 2017-05-05 2017-08-18 西安太世德航空电器有限公司 A kind of surge restraint circuit and Surge suppression method
CN208094180U (en) * 2018-05-10 2018-11-13 延边大学 A kind of AC and DC low-power consumption surge current absorber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148058A (en) * 2007-12-13 2009-07-02 Sanken Electric Co Ltd Active filter apparatus and power conversion apparatus
CN102969765A (en) * 2012-11-13 2013-03-13 深圳市博驰信电子有限责任公司 Constant-current constant-voltage charge control circuit
JP2014117062A (en) * 2012-12-10 2014-06-26 Seiko Epson Corp Rush current suppression circuit, and power supply
CN202997919U (en) * 2012-12-24 2013-06-12 成都芯源***有限公司 Ripple suppression circuit and power supply system thereof
CN107069688A (en) * 2017-05-05 2017-08-18 西安太世德航空电器有限公司 A kind of surge restraint circuit and Surge suppression method
CN208094180U (en) * 2018-05-10 2018-11-13 延边大学 A kind of AC and DC low-power consumption surge current absorber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114629096A (en) * 2022-05-13 2022-06-14 河南新太行电源股份有限公司 Constant-current anti-surge starting circuit
CN117833187A (en) * 2024-03-04 2024-04-05 成都新欣神风电子科技有限公司 Surge voltage suppression circuit
CN117833187B (en) * 2024-03-04 2024-06-07 成都新欣神风电子科技有限公司 Surge voltage suppression circuit

Also Published As

Publication number Publication date
CN113162382B (en) 2023-06-06

Similar Documents

Publication Publication Date Title
CN107769560B (en) Adjustable switching power supply based on BUCK circuit
CN113162382A (en) Surge current suppression circuit
CN104466886B (en) Load protection circuit and load protective method
CN112467971B (en) Slow starting circuit
CN113885636B (en) Input voltage range adjustable protection circuit
CN105162313B (en) A kind of inverse-excitation type switch power-supply
CN107666305B (en) Intelligent switch
WO2023246506A1 (en) Starting control circuit and switching power source system
CN109861514B (en) Starting control method and circuit
CN114243665A (en) Current detection type current surge suppression circuit based on feedback and feedforward
CN210120398U (en) Linear voltage-stabilizing input overvoltage protection circuit
CN114928147A (en) Battery charging protection circuit, chip and power module
CN116979493A (en) Surge suppression circuit for equipment
CN113098470A (en) Load switch circuit
CN114629096B (en) Constant-current anti-surge starting circuit
CN219329693U (en) Quick discharge circuit of electric capacity
CN213937862U (en) IGBT circuit for realizing pre-charging
CN215772563U (en) Delay starting circuit and switch
CN219873316U (en) Double-coil magnetic latching relay driving circuit
CN218526303U (en) High current-carrying electronic switch with breakdown protection function
CN219305085U (en) Power supply protection circuit and electronic ballast
CN217935135U (en) Self-slow charging circuit
CN217240590U (en) Power supply circuit
CN216819712U (en) Switching power supply circuit with long power-down retention time
CN214480267U (en) Starting circuit of switching power supply

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant