CN102761114B - Surge current suppression circuit - Google Patents
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- CN102761114B CN102761114B CN201210248756.9A CN201210248756A CN102761114B CN 102761114 B CN102761114 B CN 102761114B CN 201210248756 A CN201210248756 A CN 201210248756A CN 102761114 B CN102761114 B CN 102761114B
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Abstract
The invention discloses a surge current suppression circuit which comprises a direct current power supply and an electric device, wherein the electric device is connected with two ends of the direct current power supply. The surge current suppression circuit further comprises a variable limiting current resistor module of a power supply loop which is serially connected with a direct current power supply and the electric device, wherein during the access action process of the power supply loop, the resistance value of the equivalent resistance of the variable limiting current resistor module between the direct current power supply and the electric device is reduced to zero from a maximum preset value gradually. Through the arrangement, a surge current generated in the power supply loop at the moment of the electrification can be suppressed effectively through the equivalent resistance in the power supply loop; and meanwhile when the electric device is in the working state, the resistance of the electric device in the power supply loop is reduced to zero, and therefore the effective voltage of the circuit is not reduced, and no extra power consumption is introduced.
Description
Technical Field
The present invention relates to circuits, and particularly to an inrush current suppression circuit.
Background
In an electronic device using a dc power source (e.g., a battery), since energy storage elements, such as capacitors, inductors, etc., are generally present in the electronic device, the dc power source will charge the energy storage elements at the moment of power-up. Meanwhile, because the energy storage elements generally have large capacity and small equivalent resistance, very large charging current, namely surge current, is generated at the moment of electrifying; severe will also be accompanied by the occurrence of sparking phenomena. Such large transient currents will seriously affect the reliability of the electronic device. At present, a generally adopted method is to additionally connect a delay start module in series on a power line of an internal circuit of an electronic device to slowly connect a direct current power supply and the electronic device, so as to avoid the impact of transient surge current.
However, the delay start module is additionally connected to the circuit, and additional electronic components are required, so that the manufacturing and testing costs are increased; in addition, the PCB area will also be increased, which is a disadvantageous factor for miniaturized electronic devices. Meanwhile, the devices connected in series in the power channel may cause voltage drop and power loss, reduce the service time of the battery, and deteriorate the performance of the device, especially for portable devices operating at low voltage and high current. Moreover, in the repeated operation process, as the delay starting module is not in a zero state, the delay time is shortened, and even the effect of inhibiting surge current is lost. There are also reliability risks, such as the use of excessive components increasing the risk of failure, such as certain capacitors having life and temperature problems, etc. On the other hand, in order to prevent the large capacitor on the power supply circuit from discharging to the outside through the battery holder, a diode needs to be added between the battery holder and the capacitor, so that the effective voltage on the circuit is further reduced, and extra power consumption is brought.
Disclosure of Invention
The invention aims to solve the technical problem of providing a surge current suppression circuit aiming at the defects of voltage reduction and power consumption reduction in the process of suppressing surge current in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided an inrush current suppression circuit including a direct current power supply and a power consumer connected across the direct current power supply, the inrush current suppression circuit further including: the variable current limiting resistor module is connected in series with the direct current power supply and a power supply loop of the electric equipment; in the process of the switching-on action of the power supply loop, the resistance value of the equivalent resistor of the variable current-limiting resistor module connected between the direct-current power supply and the electric equipment is gradually reduced from a preset maximum value to zero.
In the inrush current suppression circuit according to the embodiment of the present invention, during the disconnection of the power supply loop, the resistance value of the equivalent resistor of the variable current limiting resistor module connected between the dc power supply and the power consumer gradually increases from zero to a preset maximum value.
In the inrush current suppression circuit according to the embodiment of the present invention,
the direct current power supply is a plug-in type battery;
the variable current-limiting resistance module comprises a first battery positive pole piece and a second battery positive pole piece which are connected with the positive pole of the direct-current power supply, and a first battery negative pole piece and a second battery negative pole piece which are connected with the negative pole of the direct-current power supply; the first and second device positive pole pieces are correspondingly connected with the positive pole of the electric device, and the first and second device negative pole pieces are correspondingly connected with the negative pole of the electric device; the first current limiting resistor and the second current limiting resistor; wherein,
the length of the first equipment positive pole piece is greater than that of the second equipment positive pole piece, and the length of the first equipment negative pole piece is greater than that of the second equipment negative pole piece;
the first current-limiting resistor is connected in series between the positive pole of the electric equipment and the positive pole piece of the first equipment, and the second current-limiting resistor is connected in series between the negative pole of the electric equipment and the negative pole piece of the first equipment;
in the process of inserting the plug-in type battery into the electric equipment, firstly, the first battery positive pole piece is contacted with the first equipment positive pole piece, and the first battery negative pole piece is contacted with the first equipment negative pole piece; subsequently, the second battery positive electrode piece is in contact with the second device positive electrode piece, and the second battery negative electrode piece is in contact with the second device negative electrode piece.
In the inrush current suppression circuit according to the embodiment of the present invention,
the direct-current power supply is a sliding access type battery and comprises a battery positive pole piece and a battery negative pole piece;
the variable current-limiting resistance module comprises a plurality of resistance positive pole pieces, a plurality of corresponding resistance negative pole pieces and a plurality of current-limiting resistance units; the plurality of resistance positive pole pieces are respectively connected with the positive pole of the electric equipment through respective current-limiting resistance units; the resistance value of the equivalent resistor of the current-limiting resistance unit is gradually reduced from a preset maximum value to zero from the current-limiting resistance unit connected in series between the first resistor positive pole piece and the positive pole of the electric equipment to the current-limiting resistance unit connected in series between the last resistor positive pole piece and the positive pole of the electric equipment; the resistance value of the equivalent resistor of the current-limiting resistor unit is gradually reduced from a preset maximum value to zero from the current-limiting resistor unit connected in series between the first resistor negative pole piece and the negative pole of the electric equipment to the current-limiting resistor unit connected in series between the last resistor negative pole piece and the negative pole of the electric equipment;
the sliding access type battery is connected with the electric equipment in the process of being accessed into the electric equipment, and sequentially from the first resistance positive pole piece and the first resistance negative pole piece are respectively connected with the positive pole and the negative pole of the electric equipment to the last resistance positive pole piece and the last resistance negative pole piece are respectively connected with the positive pole and the negative pole of the electric equipment.
In the inrush current suppression circuit according to the embodiment of the present invention,
the current-limiting resistance unit comprises current-limiting resistors, wherein a current-limiting resistor is connected in series between every two adjacent positive resistance pole pieces, and the last positive resistance pole piece is in short circuit with the positive pole of the electric equipment;
and a current-limiting resistor is connected between every two adjacent resistor negative pole pieces in series, and the last resistor negative pole piece is in short circuit with the negative pole of the electric equipment.
In the inrush current suppression circuit according to the embodiment of the present invention, the variable current-limiting resistance module includes a switch and a variable current-limiting resistance unit, a power supply terminal of the switch is connected to the dc power supply, and an equipment terminal of the switch is connected to the electric equipment;
in the closing action process of the power supply end and the equipment end, the resistance value of the equivalent resistor of the variable current-limiting resistor unit connected between the direct-current power supply and the electric equipment is gradually reduced from a preset maximum value to zero.
In the inrush current suppression circuit according to the embodiment of the present invention, during a disconnection operation between the power source terminal and the device terminal, a resistance value of an equivalent resistor of the variable current limiting resistor unit connected between the dc power source and the electrical device gradually increases from zero to a preset maximum value.
In the inrush current suppression circuit according to the embodiment of the present invention,
the switch is a plug-in type switch and comprises a first power terminal piece, a second power terminal piece, a first equipment terminal piece and a second equipment terminal piece; wherein,
or the length of the first equipment end pole piece is greater than that of the second equipment end pole piece, and the current-limiting resistance unit is connected between the first equipment end pole piece and the electric equipment.
In the surge current suppression circuit according to the embodiment of the present invention, the switch is a sliding access switch, and includes a power terminal piece, a plurality of device terminal pieces, and a plurality of current limiting resistance units; wherein,
the plurality of equipment terminal pole pieces are respectively connected with the electric equipment through respective current limiting resistance units; from the current-limiting resistance unit connected in series between the first equipment end pole piece and the electric equipment to the current-limiting resistance unit connected in series between the last equipment end pole piece and the electric equipment, the resistance value of the equivalent resistance of the current-limiting resistance unit is gradually reduced from a preset maximum value to zero;
and in the action process of closing the sliding access type switch, the power supply end pole pieces are sequentially connected with the equipment end through the first equipment end pole piece and the electric equipment and the last equipment end pole piece.
In the inrush current suppression circuit according to the embodiment of the present invention,
the current-limiting resistance unit comprises current-limiting resistors, wherein one current-limiting resistor is connected between every two adjacent equipment end pole pieces in series, and the last equipment end pole piece is in short circuit with the electric equipment.
The invention has the following beneficial effects: the variable current limiting resistor module is connected in series in a power supply loop formed by a direct-current power supply and electric equipment, and the resistance value of the variable current limiting resistor module is gradually reduced from a preset maximum value to zero in the switching-on action process of the power supply loop, so that surge current generated in the power supply loop at the moment of power-on can be effectively inhibited; meanwhile, after the electric equipment enters a working state, the resistance value of the electric equipment in the power supply loop is reduced to a zero value, so that the effective voltage of the circuit cannot be reduced, and excessive extra power consumption cannot be brought.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a logic block diagram of an inrush current suppression circuit according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an inrush current suppression circuit according to a first embodiment of the present invention;
FIG. 3 illustrates a graph of the equivalent current limiting resistance R of FIG. 2 over time;
fig. 4 shows a surge current curve in a supply circuit without surge current suppression measures;
fig. 5 is a graph of the inrush current in the supply loop of fig. 2;
fig. 6 is a schematic structural diagram of an inrush current suppression circuit according to a first implementation manner of a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of an inrush current suppression circuit according to a second implementation manner of a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of an inrush current suppression circuit according to a first implementation of a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of an inrush current suppression circuit according to a second implementation manner of a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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.
Fig. 1 shows a logic block diagram of an inrush current suppression circuit according to an embodiment of the present invention, where, as shown in fig. 1, the inrush current suppression circuit (hereinafter referred to as a circuit) includes a dc power supply 100 and an electric device 200 connected to both ends of the dc power supply 100, and when the circuit is turned on, the electric device 200 takes power from the dc power supply 100. If only the dc power supply 100 and the electric device 200 are in the circuit, when the electric device 200 includes the energy storage element, an inrush current will be generated in the power supply loop of the dc power supply 100 and the electric device 200 at the moment of power-on.
The circuit shown in fig. 1 further comprises a variable current limiting resistance module 300 connected in series to the dc power supply 100 and the power supply loop of the powered device 200. During the process of turning on the power supply loop, the resistance value of the equivalent resistor of the variable current limiting resistor module 300 connected between the dc power supply 100 and the electric device 200 is gradually reduced from a preset maximum value to zero. Specifically, at the initial time of the power supply circuit switching-on action, the resistance value R of the equivalent resistor of the variable current limiting resistor module 300 connected between the dc power supply 100 and the electric device 200 reaches the preset maximum value Rx, and the resistance value Rx is suitable for reducing the surge current generated in the most initial power supply circuit to an acceptable level, so as to avoid the occurrence of phenomena such as sparking. As the switching-on operation continues, the resistance R gradually decreases, but the current limiting effect is still present in the supply circuit. When the power-on action is completed and the electric equipment 200 enters the working state, the resistance value R is reduced to a zero value, and at this time, the variable current-limiting resistance module 300 connected between the dc power supply 100 and the electric equipment 200 does not bring any power consumption and voltage drop to the circuit.
Preferably, during the disconnection action of the power supply circuit, the resistance value R of the variable current limiting resistance module 300 connected between the dc power supply 100 and the electric device 200 gradually increases from a zero value to the preset maximum value Rx. Specifically, when the disconnection operation starts, the resistance R is a non-zero value, which can limit the current of the power supply circuit. With the continuation of the disconnection action, the resistance value R continues to increase, and the current limiting effect becomes more and more obvious. When the power supply circuit is completely disconnected due to the disconnection action, the resistance value R is increased to the preset maximum value Rx, and the current limiting effect is maximum at the moment. Because the current-limiting resistor with the resistance value Rx is connected in series in the power supply loop at the moment, residual charges on the energy storage element cannot discharge to an external conductor to generate ignition. In this case, no additional components, such as a conventional diode, are required, and the discharge of the energy storage element to the outside during the disconnection of the supply circuit can be avoided by using the same circuit.
Fig. 2 shows a schematic structural diagram of an inrush current suppression circuit according to a first embodiment of the present invention, in which a dc power supply 100 is a plug-in battery (hereinafter, referred to as a battery), such as a battery used in a mobile device (e.g., a mobile phone). As shown in fig. 2, the variable current-limiting resistance module 300 includes a first battery positive pole piece 310 and a second battery positive pole piece 311 respectively connected to the positive pole of the dc power supply 100, and a first battery negative pole piece 312 and a second battery negative pole piece 313 respectively connected to the negative pole of the dc power supply 100; a first device positive pole piece 314 and a second device positive pole piece 315 which are respectively connected with the positive pole of the electric device 200 and a first device negative pole piece 316 and a second device negative pole piece 317 which are respectively connected with the negative pole of the electric device 200; and a first current limiting resistor 318 and a second current limiting resistor 319. Wherein the length of the first device positive pole piece 314 is greater than the length of the second device positive pole piece 315, and the length of the first device negative pole piece 316 is greater than the length of the second device negative pole piece 317. The first current limiting resistor 318 is connected in series between the positive pole of the electric device 200 and the first device positive pole piece 314, and the second current limiting resistor 319 is connected in series between the negative pole of the electric device 200 and the first device negative pole piece 316. In addition, preferably, the lengths of the first device positive pole piece 314 and the first device negative pole piece 316 are equal, and the lengths of the second device positive pole piece 315 and the second device negative pole piece 317 are equal. Generally, for convenience of operation, the first and second battery positive pole pieces 310, 311 and the first and second battery negative pole pieces 312, 313 of the variable current limiting resistance module 300 may be disposed inside the battery 100, the first and second device positive pole pieces 314, 315 of the variable current limiting resistance module 300; first and second device negative pole pieces 316, 317; and first and second current limiting resistors 318, 319 are disposed within powered device 200.
Fig. 2 shows a state in which the battery is not yet inserted into the consumer 200, i.e. the supply circuit is now open. When the battery starts to plug the electric device 200 along the arrow direction in fig. 2, first, the first battery positive pole piece 310 of the variable current limiting resistance module 300 contacts with the first device positive pole piece 314, the first battery negative pole piece 312 contacts with the first device negative pole piece 316, the power supply loop is conducted, and both the first current limiting resistance 318 and the second current limiting resistance 319 are connected to the power supply loop. At this time, the first current limiting resistor 318 and the second current limiting resistor 319 determine a resistance value R of an equivalent resistor connected between the dc power supply 100 and the electric device 200 for suppressing the inrush current, and reach a preset maximum value Rx. Fig. 3 shows a time-dependent variation curve of the resistance R in this embodiment, and as shown in fig. 3, the resistance R in the power supply loop is always the maximum value Rx in the range of time tx, so that the inrush current occurring in the power supply loop can be effectively suppressed. As the battery plugging action continues, at time tx, the second battery positive pole piece 311 of the variable current limiting resistor module 300 contacts the second device positive pole piece 315, and the second battery negative pole piece 313 contacts the second device negative pole piece 317, so that the first current limiting resistor 318 and the second current limiting resistor 319 are short-circuited, the resistance R in the power supply loop jumps to a zero value, and the zero value is always maintained during the operation of the electric device 200.
In order to more clearly show the technical effect of the inrush current suppression circuit in the present invention, a simulation method is used to compare the inrush current of the inrush current suppression circuit with the inrush current of a circuit that does not adopt any inrush current suppression measures, wherein fig. 4 is an inrush current curve of a circuit that does not adopt any inrush current suppression measures, and fig. 5 is an inrush current curve of an inrush current suppression circuit according to the embodiment of the present invention. The battery voltage was set to 7.4V in the simulation, and the first current limiting resistor 318 and the second current limiting resistor 319 both had a resistance of 15 ohms, tx was 20 milliseconds. As can be seen from fig. 4 and 5, when the circuit has no surge current suppression measure, the surge current at the moment of power-on reaches 9A, while the surge current of the surge current suppression circuit in the invention is only 0.46A at the moment of power-on, and the surge current is effectively suppressed.
Accordingly, in this embodiment, when the power supply circuit needs to be disconnected, that is, the battery is detached from the electric device 200 in the direction opposite to the arrow in the figure, first, the second battery positive pole piece 311 of the variable current limiting resistance module 300 is disconnected from the second device positive pole piece 315, and the second battery negative pole piece 313 is disconnected from the second device negative pole piece 317. However, at this time, because of the length, the first battery positive pole piece 310 of the variable current limiting resistance module 300 still keeps contact with the first device positive pole piece 314, the first battery negative pole piece 312 still keeps contact with the first device negative pole piece 316, and the power supply loop continues to be conducted, but the first current limiting resistance 318 and the second current limiting resistance 319 are connected to the power supply loop again. At this time, the first current limiting resistor 318 and the second current limiting resistor 319 determine the resistance R connected between the dc power supply 100 and the electric device 200, and reach the preset maximum Rx. After the time tx, the first battery positive pole piece 310 is disconnected from the first device positive pole piece 314, the first battery negative pole piece 312 is disconnected from the first device negative pole piece 316, and the power supply circuit is completely disconnected. From the above, it can be seen that, in the process of disassembling the battery, the equivalent resistor with the resistance Rx protects the power supply loop within the time range of tx, so that the residual charges on the energy storage element (for example, through the battery holder terminal) can be prevented from discharging to the external conductor to cause sparking, and no additional diode is required.
The above-described embodiments are intended to be illustrative only and are not intended to be limiting. For example, the length of the second device positive pole piece may be set to be greater than the length of the first device positive pole piece, and the length of the second device negative pole piece may be set to be greater than the length of the first device negative pole piece. The lengths of the first and second battery positive electrode pieces may also be different, with one being greater than the other, and the lengths of the first and second battery negative electrode pieces being different, with one being greater than the other, and so on. No further mention is made here of equivalents and modifications to the first embodiment that would occur to persons skilled in the art based on the teachings herein, and which are within the scope of the invention.
In the second embodiment of the present invention, the dc power supply 100 is a sliding access battery, and includes a battery positive electrode tab and a battery negative electrode tab. At this time, the variable current limiting resistor module 300 includes a plurality of positive resistance electrode pieces, a plurality of corresponding negative resistance electrode pieces (the positive resistance electrode pieces and the negative resistance electrode pieces are in one-to-one correspondence), and a plurality of current limiting resistor units. The plurality of positive resistance pole pieces are respectively connected with the positive electrode of the electric equipment 200 through respective current-limiting resistance units, wherein the resistance values of the current-limiting resistance units are gradually reduced from a preset maximum value Rx to a zero value from the current-limiting resistance unit connected in series between the first positive resistance pole piece and the positive electrode of the electric equipment 200 to the current-limiting resistance unit connected in series between the last positive resistance pole piece and the positive electrode of the electric equipment 200; correspondingly, from the current-limiting resistance unit connected in series between the first resistance negative pole piece and the negative pole of the electric device 200 to the current-limiting resistance unit connected in series between the last resistance negative pole piece and the negative pole of the electric device 200, the resistance value of the current-limiting resistance unit gradually decreases from the preset maximum value to zero. In the process of accessing the electrical device 200, the sliding access battery sequentially connects the positive electrode and the negative electrode of the electrical device 200 through the first positive resistance pole piece and the first negative resistance pole piece, respectively, until the positive electrode and the negative electrode of the electrical device 200 are connected through the last positive resistance pole piece and the last negative resistance pole piece, respectively.
Fig. 6 shows a first implementation manner of the second embodiment, each current-limiting resistance unit includes a respective current-limiting resistance combination, where a current-limiting resistance is connected in series between every two adjacent positive resistance pole pieces, and the last positive resistance pole piece is shorted with the positive pole of the electrical device 200. With the first resistor anode pole piece 3211For example, the current limiting resistor unit includes a current limiting resistor 3211To 3214At this time, the first resistance anode piece 3221The resistance value of the equivalent resistor between the resistance value of the equivalent resistor and the anode of the equipment reaches the maximum value Rmax if the resistance value of each current-limiting resistor is R1Then Rmax =4 xr at this time1. By analogy, the second resistance anode plate 3222Resistance value R' =3 XR of equivalent resistor between the anode of device and anode of device1. And the last resistance anode piece 3225The resistance R' =0 due to shorting to the device anode. Correspondingly, a current-limiting resistor is connected in series between every two adjacent resistor negative pole pieces, and the last resistor negative pole piece is in short circuit with the negative pole of the electric device 200. Any one of the resistive negative electrode pads is similar to the corresponding resistive positive electrode pad, e.g., the first resistive negative electrode pad 3231The resistance of the equivalent resistor to the negative pole of the device reaches a maximum value Rmax if each current limiting resistor (324)1To 3244) Has a resistance value of R1Then Rmax =4 xr at this time1。
In the process of inserting the sliding insertion type battery into the electric device 200, first, the positive electrode tab 121 and the negative electrode tab 122 of the battery are respectively connected to the first resistance positive electrode tab 3221And a first resistive negative pole piece 3231And thus are connected to the positive electrode and the negative electrode of the electric device 200, respectively. At the moment, the equivalent current-limiting resistance value connected into the power supply loopR reaches a maximum value determined by Rmax. Then, the equivalent surge current resistance value connected in the power supply loop is continuously reduced when the equivalent surge current resistance value is contacted with the second, third and … to the last positive pole piece and the negative pole piece of the resistor respectively in sequence, and when the equivalent surge current resistance value is contacted with the last positive pole piece 322 of the resistor5And a final resistive negative pole piece 3235And when the two contact points are respectively connected with the anode and the cathode of the electric equipment 200, the electric equipment 200 enters a working state, and the equivalent surge current resistance value R connected into the power supply loop is zero.
Correspondingly, in the process of sliding to remove the battery, firstly, the positive pole piece and the negative pole piece of the battery are respectively connected with the positive pole piece and the negative pole piece of the last resistor, and in the sliding process, the positive pole piece and the negative pole piece of the battery are sequentially connected with the last one, the last one and … until the positive pole piece and the negative pole piece of the first resistor, and the resistance value R is increased to the maximum value Rx from zero values.
It should be understood that the number of resistive positive pole pieces and resistive negative pole pieces shown herein is by way of example only and is not limiting of the invention. And three or six resistance positive pole pieces and resistance negative pole pieces with other quantities can be adopted, so that the change of the resistance R along with time is changed.
FIG. 7 shows a second implementation of the second embodiment, each resistive positive pole piece 3261To 3265Each resistor negative pole piece 327 is connected to the positive pole of the powered device 200 through a respective current limiting resistor1To 3275Are connected to the negative pole of the consumer 200 via respective current limiting resistors. First resistance positive pole piece 3261Through a current limiting resistor 3251A current limiting resistor 325 connected to the positive pole of the device1The other current limiting resistor 325 with the largest resistance value2To 3254Gradually decreasing in resistance, the last positive resistance pole piece 3265Shorted to the positive pole of the device. The resistance negative pole piece is similar to the corresponding resistance positive pole piece.
During the sliding connection of the battery to the electric device 200, the positive pole and the negative pole of the battery are respectively connected to the first oneResistance anode pole piece 3261And a first resistive negative pole piece 3271And thus are connected to the positive electrode and the negative electrode of the electric device 200, respectively. At this time, the resistance R of the equivalent current limiting resistor connected to the power supply loop reaches the maximum value, which is obtained by the existing resistor 3251And 3281And (6) determining. When the battery slides to the last positive resistance pole piece 3265And a final resistive negative pole piece 3275When the contact is made, the electrification is completed, and the resistance value R of the equivalent current limiting resistor in the power supply loop is zero. The battery sliding and dismounting process is analogized.
The above two implementations are only used as examples and are not intended to limit the present invention, and equivalents and substitutions of the above two implementations are within the scope of the present invention. In addition, the variable current limiting resistance module 300 may be provided in the electric device 200, for example.
The above first and second embodiments have explained the case when the dc power supply 100 is a detachable battery, but in many cases, the dc power supply 100 is not necessarily a battery, but a fixed power supply device, and this corresponds to the third embodiment of the present invention. In this embodiment, the variable current-limiting resistance module 300 includes a switch and a variable current-limiting resistance unit, a power supply terminal of the switch is connected to the dc power supply 100, an equipment terminal is connected to the electric equipment 200, and the on or off of the power supply loop is controlled by the on or off of the switch (i.e., the on or off of the power supply terminal and the equipment terminal). During the closing operation of the switch, the resistance value of the variable current-limiting resistor unit connected between the dc power supply 100 and the electric device 200 is gradually reduced from a preset maximum value to zero. Preferably, during the opening action of the switch, the resistance value of the equivalent resistor of the variable current limiting resistor unit connected between the dc power supply 100 and the electric device 200 gradually increases from zero to a preset maximum value.
Fig. 8 shows a schematic structural diagram of the inrush current suppression circuit in the first implementation manner in this embodiment, where the switch is a plug-in switch, and includes a first power terminal piece 331 and a second power terminal piece 332, and a corresponding first device terminal piece 333 and a second device terminal piece 334. The length of the first device terminal pole piece 333 is greater than the length of the second device terminal pole piece 334, and the current limiting resistance unit 335 is connected between the first device terminal pole piece 333 and the electric device 200. Of course, the length of the first power terminal piece may be greater than the length of the second power terminal piece.
As shown in fig. 8, during the operation of closing the switch, first, the longer first device terminal pole piece 333 contacts the first battery terminal pole piece 331, and the current limiting resistor 335 is connected to the power supply circuit. At this time, the current-limiting resistor 335 determines the resistance R connected between the dc power supply 100 and the electric device 200, and reaches the preset maximum Rx. Fig. 3 shows a time variation curve of the equivalent current limiting resistance R in this embodiment, and as shown in fig. 3, the resistance R in the power supply loop is always the maximum value Rx in the range of time tx, so that the inrush current occurring in the power supply loop can be effectively always. As the battery plugging action continues, at time tx, the shorter second device terminal pad 334 contacts the second battery terminal pad 332, so that the current limiting resistor 335 is short-circuited, the resistance R in the supply loop jumps to a zero value, and remains at the zero value during the operation of the electrical device 200.
Accordingly, in this embodiment, during the opening action of the switch, first, the second device terminal tab 334 is disconnected from the second battery terminal tab 332. However, at this time, because of the length, the first device terminal pole piece 333 is still in contact with the first battery terminal pole piece 331, and the power supply circuit continues to be turned on, but the current limiting resistor 335 is switched into the power supply circuit again. At this time, the current limiting resistor 335 determines an equivalent current limiting resistance R connected between the dc power supply 100 and the electric device 200, and reaches a preset maximum value Rx. After the time tx passes, the first device terminal pole piece of the current limiting resistance module is disconnected from the first battery terminal pole piece, and the power supply loop is completely disconnected. From the above, it can be seen that, since the current-limiting resistor with the equivalent resistance Rx protects the power supply loop in the time range of tx during the switch off process, the residual charges on the energy storage element (for example, through the battery holder terminal) can be prevented from discharging to the external conductor to cause ignition, and no additional diode is required.
The above-described embodiments are intended to be illustrative only and are not intended to be limiting. Equivalents and modifications to the above described implementations are within the scope of the invention.
In another implementation of this embodiment, the switch is a sliding-access switch, and includes a power terminal piece, a plurality of device terminal pieces, and a plurality of current-limiting resistor units. The plurality of device terminal pieces are connected to the electric device 200 through respective current limiting resistor units. From the current-limiting resistance unit connected in series between the first device terminal pole piece and the electric device 200 to the current-limiting resistance unit connected in series between the last device terminal pole piece and the electric device 200, the resistance value of the current-limiting resistance unit is gradually reduced from the preset maximum value to zero. During the closing action of the sliding access switch, the power source terminal pieces are sequentially connected to the electric equipment 200 through the first equipment terminal piece and the last equipment terminal piece. Accordingly, during the operation of turning off the sliding access switch, the power source terminal pieces are sequentially connected from the end connected to the electric device 200 through the last device terminal piece and the first device terminal piece.
Specifically, as shown in the example in fig. 9, each current-limiting resistance unit includes a respective current-limiting resistance combination, where a current-limiting resistance is connected in series between every two adjacent device terminal pads, and the last device terminal pad is shorted with the electric device 200. With a first device terminal pad 3421For example, the current limiting resistor unit includes a current limiting resistor 3431To 3434In series, the first device side pole piece 342 at this time1The resistance value of the equivalent resistor between the current limiting resistor and the electric equipment 200 reaches the maximum value Rmax if the resistance value of each current limiting resistor is R1Then Rmax =4 xr at this time1. By analogy, second device side pole piece 3422Resistance value R' =3 × R of equivalent resistor with electric equipment 2001. And the last device terminal pad 3425Since the electrical device 200 is short-circuited, the resistance R' = 0.
Slide switch on-off electricity utilizationIn the process of the device 200, first, the power terminal pad of the switch is connected to the first device terminal pad 3421Thereby being connected with the electric device 200. At this time, the resistance value R of the equivalent current limiting resistor connected into the power supply loop reaches the maximum value, and the maximum value is determined by Rmax. And then, the power supply end pole piece is sequentially contacted with the second, third and … to the last equipment end pole piece, the equivalent surge current resistance value accessed in the power supply loop is continuously reduced, when the power supply end pole piece and the last equipment end pole piece, the electric equipment 200 enters a working state, and the equivalent surge current resistance value R accessed in the power supply loop is zero.
Accordingly, during the opening of the switch, the power terminal plate is first brought into contact with the last device terminal plate, while at the same time being brought into contact with the penultimate device terminal plate by sliding, and during the subsequent sliding, successively with the penultimate device terminal, …, until the first device terminal is brought into contact, the resistance R gradually increasing from a zero value to the maximum value Rx.
The above-described implementations are merely examples and are not limiting of the invention. Equivalents and modifications to the above described implementations are within the scope of the invention.
It should be understood that the various electrode sheets described above are electrode sheets commonly used in the art, such as metal sheets and the like.
As can be seen from the above, in the inrush current suppression circuit of the present invention, the variable current limiting resistor module is connected in series in the power supply loop formed by the dc power supply and the electric device, and during the turn-on operation of the power supply loop, the resistance value of the equivalent resistor of the variable current limiting resistor module is gradually reduced from the preset maximum value to zero, so that the inrush current generated in the power supply loop at the moment of power-on can be effectively suppressed; meanwhile, after the electric equipment enters a working state, the resistance value of the equivalent resistor in the power supply loop is reduced to a zero value, so that the effective voltage of the circuit cannot be reduced, and excessive extra power consumption cannot be brought. In addition, the variable current-limiting resistance module can be realized by adopting simple resistors, electrode plates and/or switches, so that the variable current-limiting resistance module is low in cost and easy to realize, and meanwhile, targeted test items do not need to be arranged for the variable current-limiting resistance module and 100% of tests do not need to be carried out. In addition, by adopting the variable current limiting resistor module, the direct-current power supply and the electric equipment do not need to be additionally transformed, and the variable current limiting resistor module can be directly used, so that the area of a PCB is not occupied. Meanwhile, the variable current limiting resistance module is suitable for a detachable battery type direct current power supply and a fixed direct current power supply device, and is wide in application range. On the other hand, in the power-off process of the power supply loop, the resistance value of the equivalent resistor connected into the power supply loop by the variable current-limiting resistor module is gradually increased from a zero value to a maximum value, so that a diode does not need to be additionally arranged in the circuit to prevent an energy storage element in the electric equipment from discharging to the outside at the power-off moment.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (14)
1. An inrush current suppression circuit comprising a dc power supply and a consumer connected across the dc power supply, the inrush current suppression circuit further comprising: the variable current limiting resistor module is connected in series with the direct current power supply and a power supply loop of the electric equipment; in the action process that the direct-current power supply is connected into the power supply loop, the resistance value of the equivalent resistor of the variable current limiting resistor module connected between the direct-current power supply and the electric equipment is gradually reduced from a preset maximum value to zero.
2. The inrush current suppression circuit according to claim 1, wherein during the action of disconnecting the dc power supply from the power supply loop, a resistance value of an equivalent resistor of the variable current limiting resistor module connected between the dc power supply and the electric device gradually increases from zero to a preset maximum value.
3. The inrush current suppression circuit according to claim 1 or 2,
the direct-current power supply is a sliding access type battery and comprises a battery positive pole piece and a battery negative pole piece;
the variable current-limiting resistance module comprises a plurality of resistance positive pole pieces, a plurality of corresponding resistance negative pole pieces and a plurality of current-limiting resistance units; the plurality of resistance positive pole pieces are respectively connected with the positive pole of the electric equipment through respective current-limiting resistance units; the resistance value of the equivalent resistor of the current-limiting resistance unit is gradually reduced from a preset maximum value to zero from the current-limiting resistance unit connected in series between the first resistor positive pole piece and the positive pole of the electric equipment to the current-limiting resistance unit connected in series between the last resistor positive pole piece and the positive pole of the electric equipment; the resistance value of the equivalent resistor of the current-limiting resistor unit is gradually reduced from a preset maximum value to zero from the current-limiting resistor unit connected in series between the first resistor negative pole piece and the negative pole of the electric equipment to the current-limiting resistor unit connected in series between the last resistor negative pole piece and the negative pole of the electric equipment;
the sliding access type battery is connected with the electric equipment in the process of being accessed into the electric equipment, and sequentially from the first resistance positive pole piece and the first resistance negative pole piece are respectively connected with the positive pole and the negative pole of the electric equipment to the last resistance positive pole piece and the last resistance negative pole piece are respectively connected with the positive pole and the negative pole of the electric equipment.
4. The method of claim 3,
the current-limiting resistance unit comprises current-limiting resistors, wherein a current-limiting resistor is connected in series between every two adjacent positive resistance pole pieces, and the last positive resistance pole piece is in short circuit with the positive pole of the electric equipment;
and a current-limiting resistor is connected between every two adjacent resistor negative pole pieces in series, and the last resistor negative pole piece is in short circuit with the negative pole of the electric equipment.
5. The inrush current suppression circuit according to claim 1, wherein the variable current-limiting resistance module includes a switch and a variable current-limiting resistance unit, a power supply terminal of the switch is connected to the dc power supply, and an equipment terminal of the switch is connected to the electric equipment;
in the closing action process of the power supply end and the equipment end, the resistance value of the equivalent resistor of the variable current-limiting resistor unit connected between the direct-current power supply and the electric equipment is gradually reduced from a preset maximum value to zero.
6. The inrush current suppression circuit according to claim 5, wherein during the disconnection between the power supply terminal and the device terminal, a resistance value of an equivalent resistor of the variable current-limiting resistor unit connected between the dc power supply and the electrical device gradually increases from zero to a preset maximum value.
7. The inrush current suppression circuit according to claim 5 or 6, wherein the switch is a sliding-access switch including a power terminal piece, a plurality of device terminal pieces, and a plurality of current limiting resistance units; wherein,
the plurality of equipment terminal pole pieces are respectively connected with the electric equipment through respective current limiting resistance units; from a current-limiting resistance unit connected in series between a first device end pole piece and the electric equipment to a current-limiting resistance unit connected in series between a last device end pole piece and the electric equipment, the resistance value of an equivalent resistor of the current-limiting resistance unit is gradually reduced from a preset maximum value to zero;
and in the action process of closing the sliding access type switch, the power supply end pole pieces are sequentially connected with the equipment end through the first equipment end pole piece and the electric equipment and the last equipment end pole piece.
8. The inrush current suppression circuit of claim 7,
the current-limiting resistance unit comprises current-limiting resistors, wherein one current-limiting resistor is connected between every two adjacent equipment end pole pieces in series, and the last equipment end pole piece is in short circuit with the electric equipment.
9. An inrush current suppression circuit comprising a dc power supply and a consumer connected across the dc power supply, the inrush current suppression circuit further comprising: the variable current limiting resistor module is connected in series with the direct current power supply and a power supply loop of the electric equipment; in the action process that the direct-current power supply is connected into the power supply loop, the resistance value of the equivalent resistor of the variable current limiting resistor module connected between the direct-current power supply and the electric equipment jumps from a preset maximum value to a zero value.
10. The inrush current suppression circuit according to claim 9, wherein during the action of disconnecting the dc power supply from the power supply loop, a resistance value of an equivalent resistor of the variable current limiting resistor module connected between the dc power supply and the electric device jumps from zero to a preset maximum value.
11. The inrush current suppression circuit of claim 9 or 10,
the direct current power supply is a plug-in type battery;
the variable current-limiting resistance module comprises a first battery positive pole piece and a second battery positive pole piece which are connected with the positive pole of the direct-current power supply, and a first battery negative pole piece and a second battery negative pole piece which are connected with the negative pole of the direct-current power supply; the first and second device positive pole pieces are correspondingly connected with the positive pole of the electric device, and the first and second device negative pole pieces are correspondingly connected with the negative pole of the electric device; the first current limiting resistor and the second current limiting resistor; wherein,
the length of the first equipment positive pole piece is greater than that of the second equipment positive pole piece, and the length of the first equipment negative pole piece is greater than that of the second equipment negative pole piece;
the first current-limiting resistor is connected in series between the positive pole of the electric equipment and the positive pole piece of the first equipment, and the second current-limiting resistor is connected in series between the negative pole of the electric equipment and the negative pole piece of the first equipment;
in the process of inserting the plug-in type battery into the electric equipment, firstly, the first battery positive pole piece is contacted with the first equipment positive pole piece, and the first battery negative pole piece is contacted with the first equipment negative pole piece; subsequently, the second battery positive electrode piece is in contact with the second device positive electrode piece, and the second battery negative electrode piece is in contact with the second device negative electrode piece.
12. The inrush current suppression circuit according to claim 9, wherein the variable current-limiting resistance module includes a switch and a variable current-limiting resistance unit, a power supply terminal of the switch is connected to the dc power supply, and an equipment terminal of the switch is connected to the electric equipment;
in the closing action process of the power supply end and the equipment end, the resistance value of the equivalent resistor of the variable current-limiting resistor unit connected between the direct-current power supply and the electric equipment jumps from a preset maximum value to zero.
13. The inrush current suppression circuit according to claim 12, wherein during the disconnection between the power supply terminal and the device terminal, a resistance value of an equivalent resistor of the variable current-limiting resistor unit connected between the dc power supply and the electrical device jumps from zero to a preset maximum value.
14. The inrush current suppression circuit of claim 12 or 13,
the switch is a plug-in type switch and comprises a first power terminal piece, a second power terminal piece, a first equipment terminal piece and a second equipment terminal piece; wherein,
the length of the first equipment end pole piece is greater than that of the second equipment end pole piece, and the current-limiting resistance unit is connected between the first equipment end pole piece and the electric equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210248756.9A CN102761114B (en) | 2012-07-18 | 2012-07-18 | Surge current suppression circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210248756.9A CN102761114B (en) | 2012-07-18 | 2012-07-18 | Surge current suppression circuit |
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| CN106450071B (en) * | 2015-08-04 | 2019-08-06 | 南京德朔实业有限公司 | Battery pack and its with the combination of electric tool and the method for connecting them |
| JP6412092B2 (en) | 2016-12-19 | 2018-10-24 | ファナック株式会社 | Inrush current prevention circuit, inrush current prevention method, and inrush current prevention program |
| CN107612803A (en) * | 2017-11-02 | 2018-01-19 | 上海辛莫智能科技有限公司 | A kind of data conversion Biodge device |
| CN111175629A (en) * | 2018-11-09 | 2020-05-19 | 中国科学院长春光学精密机械与物理研究所 | Method for rapidly detecting performance of surge suppression circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084944C (en) * | 1995-09-14 | 2002-05-15 | 雷伊化学公司 | Overcurrent protection circuit |
| CN102170117A (en) * | 2011-04-27 | 2011-08-31 | 海能达通信股份有限公司 | Battery protecting device and protecting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI347721B (en) * | 2007-06-20 | 2011-08-21 | Asustek Comp Inc | Electric system and a battery module |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084944C (en) * | 1995-09-14 | 2002-05-15 | 雷伊化学公司 | Overcurrent protection circuit |
| CN102170117A (en) * | 2011-04-27 | 2011-08-31 | 海能达通信股份有限公司 | Battery protecting device and protecting method |
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