CN114629096B - Constant-current anti-surge starting circuit - Google Patents

Constant-current anti-surge starting circuit Download PDF

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Publication number
CN114629096B
CN114629096B CN202210516477.XA CN202210516477A CN114629096B CN 114629096 B CN114629096 B CN 114629096B CN 202210516477 A CN202210516477 A CN 202210516477A CN 114629096 B CN114629096 B CN 114629096B
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capacitor
circuit
constant
resistor
electrode
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CN114629096A (en
Inventor
刘春生
宋海峰
陈宏�
白志鹏
王丽国
张黎明
杨雨晨
韩震
周凤翔
田艳祥
李淑平
李加勇
申民常
高臣助
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Henan Xintaihang Power Co ltd
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Henan Xintaihang Power Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

A constant-current anti-surge starting circuit comprises a load, a capacitor and a constant-current circuit, wherein the constant-current circuit is connected in series with the positive electrode of the capacitor or connected in series with the negative electrode of the capacitor, the load is connected in parallel with the capacitor, a controlled voltage circuit is connected in parallel between the input end and the output end of the constant-current circuit, the controlled voltage circuit comprises a switch circuit for short-circuiting the constant-current circuit and a control circuit for conducting the switch circuit according to the voltage between the input end and the output end of the constant-current circuit, a delay circuit is connected in parallel on the constant-current circuit and used for enabling the control circuit to be conducted in advance of the constant-current circuit at the moment of power-on, an anti-surge resistor is connected in series in the control circuit, and when the control circuit is conducted, the anti-surge resistor is connected in parallel with the load. The control circuit controls the switch circuit according to the voltages at two ends of the constant current circuit, and the control circuit, the delay circuit and the anti-impact resistor are matched, so that the requirement that the impact current cannot exceed the specific multiple of the rated current at the moment of electrifying is met, and the damage and loss caused by starting the impact current are avoided.

Description

Constant-current anti-surge starting circuit
Technical Field
The invention relates to a starting circuit, in particular to a constant-current anti-surge starting circuit.
Background
Most equipment can generate impact current which is several times or even tens times larger than normal working current when being started, and in capacitive load, the electrifying moment is equivalent to short circuit, and the current is equivalent to infinity. According to the requirements of clients: the impact current at the moment of power-on cannot exceed a specific multiple of the rated current, and the impact current is recovered to be normal within a specified time after the power-on.
CN113162382A a surge current suppression circuit, which includes a constant current circuit, a detection circuit and a switch circuit, the constant current circuit is connected in series with the positive electrode of the capacitor or connected in series with the negative electrode 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 the reference ground, and when the potential difference at the two ends is smaller than a set value, the switch tube of the switch circuit is controlled to be closed and conducted, so as to complete the start timing sequence. The detection circuit calculates the potential difference of the capacitor to the reference ground by detecting the difference between the power supply voltage and the capacitor voltage, so that the accuracy of the calculated potential difference is reduced, and the speed of controlling the switching-on of the switch circuit is reduced. In addition, as can be seen from the background art of the inrush current suppression circuit in CN113162382A, there are some problems with other related solutions.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a constant-current anti-surge starting circuit, aiming at improving the accuracy and the response speed of a detection circuit and ensuring that the impact current at the moment of electrifying can not exceed a specific multiple of the rated current, thereby preventing the damage and the loss caused by the impact current when starting large-capacity equipment.
A constant-current anti-surge starting circuit comprises a load, a capacitor and a constant-current circuit, wherein the constant-current circuit is connected in series with the positive electrode of the capacitor or the negative electrode of the capacitor, the load is connected in parallel with the capacitor, a controlled voltage circuit is connected in parallel between the input end and the output end of the constant-current circuit, the controlled voltage circuit comprises a switch circuit used for short-circuiting the constant-current circuit and a control circuit used for conducting the switch circuit according to the voltage between the input end and the output end of the constant-current circuit, a delay circuit is connected in parallel on the constant-current circuit and used for enabling the control circuit to be conducted before the constant-current circuit at the moment of power-on, an impact resistance is connected in series in the control circuit, and when the control circuit is conducted, the impact resistance is connected in parallel with the load.
The working principle of the invention is as follows: after the power supply is switched on, the delay circuit enables the control circuit to be conducted before the constant current circuit at the moment of power-on, and under the action of parallel connection of the anti-impact resistor and the load, the voltage at two ends of the load is reduced, so that the impact current flowing through the load at the moment of power-on is reduced, the impact current does not exceed a specific multiple of the rated current, and the load is protected. After the constant current circuit is started and under the action of the constant current circuit, the voltage constant rate at two ends of the capacitor is increased, the voltage of the load is slowly increased, meanwhile, the voltage of the input end and the voltage of the output end of the constant current circuit are reduced at the constant rate, and when the voltage of the input end and the voltage of the output end of the constant current circuit are reduced to a certain threshold value, the control circuit switches on the switch circuit, so that the load is completely connected to the power supply loop.
Further: the constant current circuit comprises an MOS tube Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected with a positive electrode of a power supply, the other branch of the capacitor is electrically connected with a grid electrode of the MOS tube Q1 after sequentially passing through a resistor R1, a resistor R2 and a resistor R3, a drain electrode of the MOS tube Q1 is connected with the capacitor and is the common end of the capacitor and the constant current circuit, a source electrode of the MOS tube Q1 is connected with a negative electrode of the power supply after passing through a resistor Ri, the grid electrode of the MOS tube Q1 is further connected with a cathode of the TL431, an anode of the TL431 is connected with a negative electrode of the power supply, and a reference electrode of the TL431 is electrically connected with the source electrode of the MOS tube Q1.
Further: the control circuit comprises a triode Q3, the base electrode of the triode Q3 is electrically connected with the drain electrode of the MOS transistor Q1 after sequentially passing through a resistor R8 and a resistor R6, and the common end of the resistor R8 and the resistor R6 is connected with the negative electrode of a power supply after passing through a resistor R7; a collector of the triode Q3 is electrically connected with a gate of the MOS transistor Q1 through a resistor R5, a common end of the collector of the triode Q3 and the resistor R5 is a control end of the control circuit for controlling the switching-on of the switching circuit, and an emitter of the triode Q3 is connected with a negative electrode of a power supply; the delay circuit comprises a capacitor C2, and the grid of the MOS tube Q1 is connected with the cathode of a power supply after passing through the capacitor C2.
In order to make the switching circuit slowly switch on, produce the secondary surge when avoiding switching circuit to switch on, further: the switching circuit comprises an MOS tube Q2 and a capacitor C3, the grid electrode of the MOS tube Q2 is electrically connected with the control end of the control circuit, the drain electrode of the MOS tube Q2 is electrically connected with the common end of the capacitor and the constant current circuit, the source electrode of the MOS tube Q2 is connected with the negative electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector electrode of the triode Q3, and the other end of the capacitor C3 is connected with the negative electrode of the power supply.
Further: the constant current circuit comprises an MOS tube Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected with a negative electrode of a power supply, the other branch of the capacitor is electrically connected with a grid electrode of the MOS tube Q1 after sequentially passing through a resistor R3, a resistor R2 and a resistor R1, a drain electrode of the MOS tube Q1 is connected with the capacitor and is the common end of the capacitor and the constant current circuit, a source electrode of the MOS tube Q1 is connected with a positive electrode of the power supply after passing through a resistor Ri, a source electrode of the MOS tube Q1 is also electrically connected with an anode of a TL431, a cathode of the TL431 is electrically connected with a base electrode of a triode Q4 after passing through the resistor R5, an emitter electrode of the triode Q4 is electrically connected with the positive electrode of the power supply, and a collector electrode of the triode Q4 is electrically connected with the grid electrode of the MOS tube Q1.
In order to prevent the impact current at the moment of power-on from exceeding a specific multiple of the rated current, further: the control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with the positive electrode of a power supply, a collector of the triode Q3 is a control end used for controlling the conduction of the switch circuit in the control circuit, the emitter of the triode Q3 is electrically connected with the drain of the MOS tube Q1 after sequentially passing through a resistor R10, a breakdown diode D2, a resistor R6 and a resistor R7, and the base of the triode Q3 is electrically connected with the common end of the resistor R10 and the breakdown diode D2 after passing through the resistor R9; the delay circuit comprises a capacitor C2, and the grid of the MOS tube Q1 is also connected with the positive electrode of the power supply after passing through the capacitor C2.
In order to make the switching circuit slowly switch on, produce the secondary surge when avoiding switching circuit to switch on, further: the switching circuit comprises an MOS tube Q2 and a capacitor C3, the grid electrode of the MOS tube Q2 is electrically connected with the control end of the control circuit, the grid electrode of the MOS tube Q2 is electrically connected with the grid electrode of the MOS tube Q1 after passing through a resistor R8, the drain electrode of the MOS tube Q2 is electrically connected with the capacitor and the common end of the constant current circuit, the source electrode of the MOS tube Q2 is connected with the positive electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector electrode of the triode Q3, and the other end of the capacitor C3 is connected with the positive electrode of the power supply.
Further: a zener diode D3 for stabilizing the voltage of the transistor Q3 is provided in the control circuit.
Further: the constant current circuit is provided with a voltage stabilizing diode D1 for stabilizing the voltage of the MOS transistor Q1.
Further: the capacitor C2 is connected in parallel with a resistor R4, so that the capacitor C2 has a time delay effect and forms an RC filter circuit together with the resistor R4.
The invention has the beneficial effects that: while preventing the harm and loss caused by the impact current when starting the large-capacity equipment, the control circuit controls the switch circuit according to the voltage at the two ends of the constant current circuit, thereby improving the speed and the accuracy of controlling the switch circuit; the MOS transistor Q1 is matched with the TL431, so that the requirement of automatically recovering to be normal in the specified time after power-on is met; through the cooperation of the triode Q3 of the control circuit, the capacitor C2 in the delay circuit and the resistor, the requirement that the impact current at the moment of electrifying cannot exceed a specific multiple of the rated current is met.
Drawings
FIG. 1 is a circuit diagram of a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a second embodiment of the present invention;
FIG. 3 is a simulation plot of the charging current of capacitor C1 at start-up;
FIG. 4 is a graph showing a simulation of the voltage across capacitor C1 at start-up;
fig. 5 is a diagram showing a simulation of a voltage between an input terminal and an output terminal of the constant current circuit.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention. The terms of orientation such as left, center, right, up, down, etc. in the examples of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
The first embodiment:
a constant-current anti-surge starting circuit comprises a load, a capacitor and a constant-current circuit, wherein the constant-current circuit is connected in series with the positive electrode of the capacitor or connected in series with the negative electrode of the capacitor, the load is connected in parallel with the capacitor, a controlled voltage circuit is connected in parallel between the input end and the output end of the constant-current circuit, the controlled voltage circuit comprises a switch circuit for short-circuiting the constant-current circuit and a control circuit for conducting the switch circuit according to the voltage between the input end and the output end of the constant-current circuit, a delay circuit is connected in parallel on the constant-current circuit and used for enabling the control circuit to be conducted before the constant-current circuit at the moment of power-on, an impact resistance is connected in series in the control circuit, and when the control circuit is conducted, the impact resistance is connected in parallel with the load.
The constant current circuit comprises an MOS tube Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected with a positive electrode of a power supply, the other branch of the capacitor is electrically connected with a grid electrode of the MOS tube Q1 after sequentially passing through a resistor R1, a resistor R2 and a resistor R3, a drain electrode of the MOS tube Q1 is connected with the capacitor and is the common end of the capacitor and the constant current circuit, a source electrode of the MOS tube Q1 is connected with a negative electrode of the power supply after passing through a resistor Ri, the grid electrode of the MOS tube Q1 is further connected with a cathode of the TL431, an anode of the TL431 is connected with a negative electrode of the power supply, and a reference electrode of the TL431 is electrically connected with the source electrode of the MOS tube Q1.
The control circuit comprises a triode Q3, the base electrode of the triode Q3 is electrically connected with the drain electrode of the MOS transistor Q1 after sequentially passing through a resistor R8 and a resistor R6, the common end of the resistor R8 and the resistor R6 is connected with the negative electrode of a power supply after passing through a resistor R7, and a voltage stabilizing diode D3 is connected to the resistor R7 in parallel; a collector of the triode Q3 is electrically connected with a gate of the MOS transistor Q1 through a resistor R5, and a common end of the collector of the triode Q3 and the resistor R5 is a control end used for controlling the switch circuit in the control circuit to be conducted; the delay circuit comprises a capacitor C2, the grid of the MOS tube Q1 is connected with the negative electrode of a power supply after the capacitor C2, the emitter of the triode Q3 is connected with the negative electrode of the power supply, a voltage stabilizing diode D1 and a resistor R4 are connected to the capacitor C2 in parallel, the voltage stabilizing diode D1 is used for stabilizing the voltage of the MOS tube Q1, and the capacitor C2 has a delay effect and also forms an RC filter circuit with the resistor R4.
The switching circuit comprises an MOS tube Q2 and a capacitor C3, the grid electrode of the MOS tube Q2 is electrically connected with the control end of the control circuit, the drain electrode of the MOS tube Q2 is electrically connected with the common end of the capacitor and the constant current circuit, the source electrode of the MOS tube Q2 is connected with the negative electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector electrode of the triode Q3, and the other end of the capacitor C3 is connected with the negative electrode of the power supply.
The working principle of the invention is as follows: 1. when the circuit is started, the triode Q3 is started before the MOS transistor Q1 and the MOS transistor Q2 under the delay action of the capacitor C2 of the delay circuit; after the triode Q3 is started, the grid electrode of the MOS tube Q2 is in a short-circuit electromotive force-free state, the MOS tube Q2 is in a cut-off state, and the MOS tube Q1 is normally started after the triode Q3 is started, so that the impact current at the moment of electrifying cannot exceed a specific multiple of the rated current.
2. After the MOS transistor Q1 is started, a current loop is formed through a load end, and at this time, the current becomes large, so that the voltage of the a end is greater than 2.5V, and then the current flowing through the TL431 becomes large; as the current flowing through the TL431 increases, the current flowing through the resistor R1, the resistor R2 and the resistor R3 also increases, so that the voltage obtained by dividing the resistor R1, the resistor R2 and the resistor R3 increases, and the gate voltage of the MOS transistor Q1 decreases; the conduction degree of the MOS transistor Q1 is reduced, the voltage at the A end is smaller and smaller than 2.5V, at the moment, the current flowing through the TL431 is reduced, the currents flowing through the resistor R1, the resistor R2 and the resistor R3 are also reduced, the voltage obtained by the resistor R1, the resistor R2 and the resistor R3 is reduced, the grid voltage of the MOS transistor Q1 is increased, the conduction degree of the MOS transistor Q1 is increased, and finally the A end is balanced to 2.5V; since the resistance Ri is a constant 3.3 ohm resistance, a constant current will be established at point a.
3. With the action of the constant current circuit, the voltage constant rate at the two ends of the capacitor C1 is increased, and the voltage constant rate at the two ends of the capacitor BC is reduced; when the voltage across the BC is reduced to about 2.5v, the MOS transistor Q1 is completely in a conducting state, the voltage across the BC is reduced along with the subsequent charging of the capacitor C1, at the moment, the constant current circuit starts to end, the current charged by the circuit to the capacitor C1 is equal to the voltage across the BC divided by the resistance across the Ri, and the voltage across the capacitor C1 starts to increase at a reduced speed; when the voltage across the capacitor C1 rises to about 27.3v, that is, the voltage between the two terminals BC is about 0.7v, the current flowing from the gate to the source of the transistor Q3 slowly decreases to 0, and the MOS transistor Q2 starts, but due to the capacitor C3, the time from the start to the complete conduction of the MOS transistor Q2 is prolonged, so that the voltage of 0.7v across the two terminals BC is slowly transferred to the capacitor C1, and the voltage automatically returns to normal within a specified time after power-on. The simulation graphs of the current of the capacitor C1 in the above three stages are shown in FIG. 3, the simulation graph of the voltage change between the two ends of the capacitor C1 is shown in FIG. 4, and the simulation graph of the voltage between the two ends B and C is shown in FIG. 5.
Second embodiment:
other technical features are that under the same condition as the first embodiment, as shown in fig. 2, the constant current circuit includes a MOS transistor Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected to a negative electrode of a power supply, the other branch of the capacitor is electrically connected to a gate of the MOS transistor Q1 after passing through a resistor R3, a resistor R2 and a resistor R1 in sequence, a drain of the MOS transistor Q1 is connected to the capacitor and is a common end of the capacitor and the constant current circuit, a source of the MOS transistor Q1 is connected to a positive electrode of the power supply after passing through a resistor Ri, a source of the MOS transistor Q1 is further electrically connected to an anode of a TL431, a cathode of the TL431 is electrically connected to a base of a triode Q4 after passing through the resistor R5, an emitter of the triode Q4 is electrically connected to a positive electrode of the power supply, and a collector of the triode Q4 is electrically connected to the gate of the MOS transistor Q1.
The control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with the positive electrode of a power supply, a collector of the triode Q3 is a control end used for controlling the conduction of the switch circuit in the control circuit, the emitter of the triode Q3 is electrically connected with the drain of the MOS tube Q1 after sequentially passing through a resistor R10, a breakdown diode D2, a resistor R6 and a resistor R7, the base of the triode Q3 is electrically connected with the common end of the resistor R10 and the breakdown diode D2 after passing through the resistor R9, and the resistor R10 is connected with a voltage stabilizing diode D3 in parallel; the delay circuit comprises a capacitor C2, the grid of the MOS tube Q1 is connected with the positive electrode of a power supply after passing through the capacitor C2, a voltage stabilizing diode D1 and a resistor R4 are connected to the capacitor C2 in parallel, the voltage stabilizing diode D1 is used for stabilizing the voltage of the MOS tube Q1, and the capacitor C2 has a delay effect and forms an RC filter circuit with the resistor R4.
The switch circuit comprises an MOS tube Q2 and a capacitor C3, the grid of the MOS tube Q2 is electrically connected with the control end of the control circuit, the grid of the MOS tube Q2 is electrically connected with the grid of the MOS tube Q1 after passing through a resistor R8, the drain of the MOS tube Q2 is electrically connected with the capacitor and the common end of the constant current circuit, the source of the MOS tube Q2 is connected with the positive electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector of the triode Q3, and the other end of the capacitor C3 is connected with the positive electrode of the power supply.
Compared with the prior art: according to the invention, the control circuit controls the switch circuit according to the voltages at the two ends of the constant current circuit, so that the speed and the accuracy of controlling the switch circuit are improved; the MOS transistor Q1 is matched with the TL431, so that the requirement of automatically recovering to be normal in the specified time after power-on is met; through the cooperation of the triode Q3, the capacitor C2 and the resistor, the requirement that the impact current at the moment of electrifying cannot exceed a specific multiple of the rated current is met.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A constant-current anti-surge starting circuit comprises a load, a capacitor and a constant-current circuit, wherein the constant-current circuit is connected in series with the positive electrode of the capacitor or the negative electrode of the capacitor, the load is connected in parallel with the capacitor, a controlled voltage circuit is connected in parallel between the input end and the output end of the constant-current circuit, the controlled voltage circuit comprises a switch circuit used for short-circuiting the constant-current circuit and a control circuit used for conducting the switch circuit according to the voltage between the input end and the output end of the constant-current circuit, a delay circuit is connected in parallel on the constant-current circuit and used for enabling the control circuit to be conducted before the constant-current circuit at the moment of power-on, an impact resistance is connected in series in the control circuit, and when the control circuit is conducted, the impact resistance is connected in parallel with the load.
2. The constant-current anti-surge starting circuit according to claim 1, wherein: the constant current circuit comprises an MOS tube Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected with a positive electrode of a power supply, the other branch of the capacitor is electrically connected with a grid electrode of the MOS tube Q1 after sequentially passing through a resistor R1, a resistor R2 and a resistor R3, a drain electrode of the MOS tube Q1 is connected with the capacitor and is the common end of the capacitor and the constant current circuit, a source electrode of the MOS tube Q1 is connected with a negative electrode of the power supply after passing through a resistor Ri, the grid electrode of the MOS tube Q1 is further connected with a cathode of the TL431, an anode of the TL431 is connected with a negative electrode of the power supply, and a reference electrode of the TL431 is electrically connected with the source electrode of the MOS tube Q1.
3. The constant-current surge-prevention starting circuit according to claim 2, characterized in that: the control circuit comprises a triode Q3, the base electrode of the triode Q3 is electrically connected with the drain electrode of the MOS transistor Q1 after sequentially passing through a resistor R8 and a resistor R6, and the common end of the resistor R8 and the resistor R6 is connected with the negative electrode of a power supply after passing through a resistor R7; a collector of the triode Q3 is electrically connected with a gate of the MOS transistor Q1 through a resistor R5, and a common end of the collector of the triode Q3 and the resistor R5 is a control end used for controlling the switch circuit in the control circuit to be conducted; the time delay circuit comprises a capacitor C2, the grid of the MOS transistor Q1 is connected with the negative electrode of a power supply after passing through the capacitor C2, and the emitter of the triode Q3 is connected with the negative electrode of the power supply.
4. A constant-current anti-surge starting circuit according to claim 3, wherein: the switching circuit comprises an MOS tube Q2 and a capacitor C3, the grid electrode of the MOS tube Q2 is electrically connected with the control end of the control circuit, the drain electrode of the MOS tube Q2 is electrically connected with the common end of the capacitor and the constant current circuit, the source electrode of the MOS tube Q2 is connected with the negative electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector electrode of the triode Q3, and the other end of the capacitor C3 is connected with the negative electrode of the power supply.
5. The constant-current anti-surge starting circuit according to claim 1, wherein: the constant current circuit comprises an MOS tube Q1, one end of the capacitor is a common end of the capacitor and the constant current circuit, one branch of the other end of the capacitor is connected with a negative electrode of a power supply, the other branch of the capacitor is electrically connected with a grid electrode of the MOS tube Q1 after sequentially passing through a resistor R3, a resistor R2 and a resistor R1, a drain electrode of the MOS tube Q1 is connected with the capacitor and is the common end of the capacitor and the constant current circuit, a source electrode of the MOS tube Q1 is connected with a positive electrode of the power supply after passing through a resistor Ri, a source electrode of the MOS tube Q1 is also electrically connected with an anode electrode of a TL431, a cathode of the TL431 is electrically connected with a base electrode of a triode Q4 after passing through the resistor R5, an emitting electrode of the triode Q4 is electrically connected with a positive electrode of the power supply, and a collecting electrode of the triode Q4 is electrically connected with the grid electrode of the MOS tube Q1.
6. The constant-current anti-surge starting circuit according to claim 5, wherein: the control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with the positive electrode of a power supply, a collector of the triode Q3 is a control end used for controlling the conduction of the switch circuit in the control circuit, the emitter of the triode Q3 is electrically connected with the drain of the MOS tube Q1 after sequentially passing through a resistor R10, a breakdown diode D2, a resistor R6 and a resistor R7, and the base of the triode Q3 is electrically connected with the common end of the resistor R10 and the breakdown diode D2 after passing through the resistor R9; the delay circuit comprises a capacitor C2, and the grid electrode of the MOS tube Q1 is connected with the positive electrode of a power supply after passing through the capacitor C2.
7. The constant-current anti-surge starting circuit according to claim 6, wherein: the switching circuit comprises an MOS tube Q2 and a capacitor C3, the grid electrode of the MOS tube Q2 is electrically connected with the control end of the control circuit, the grid electrode of the MOS tube Q2 is electrically connected with the grid electrode of the MOS tube Q1 after passing through a resistor R8, the drain electrode of the MOS tube Q2 is electrically connected with the capacitor and the common end of the constant current circuit, the source electrode of the MOS tube Q2 is connected with the positive electrode of a power supply, one end of the capacitor C3 is electrically connected with the collector electrode of the triode Q3, and the other end of the capacitor C3 is connected with the positive electrode of the power supply.
8. A constant-current anti-surge starting circuit according to claim 3 or 6, wherein: a zener diode D3 for stabilizing the voltage of the transistor Q3 is provided in the control circuit.
9. A constant-current anti-surge starting circuit according to claim 4 or 7, wherein: the constant current circuit is provided with a voltage stabilizing diode D1 for stabilizing the voltage of the MOS transistor Q1.
10. A constant-current anti-surge starting circuit according to claim 3 or 6, wherein: a resistor R4 is connected in parallel to the capacitor C2.
CN202210516477.XA 2022-05-13 2022-05-13 Constant-current anti-surge starting circuit Active CN114629096B (en)

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Application Number Priority Date Filing Date Title
CN202210516477.XA CN114629096B (en) 2022-05-13 2022-05-13 Constant-current anti-surge starting circuit

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Application Number Priority Date Filing Date Title
CN202210516477.XA CN114629096B (en) 2022-05-13 2022-05-13 Constant-current anti-surge starting circuit

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