CN221467387U - Input alternating current polarity misconnection protection circuit - Google Patents
Input alternating current polarity misconnection protection circuit Download PDFInfo
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- CN221467387U CN221467387U CN202322834029.7U CN202322834029U CN221467387U CN 221467387 U CN221467387 U CN 221467387U CN 202322834029 U CN202322834029 U CN 202322834029U CN 221467387 U CN221467387 U CN 221467387U
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Abstract
The utility model discloses an input alternating current electric polarity misconnection protection circuit, which relates to the field of power protection, and comprises the following components: the lightning surge protection module is used for protecting the circuit from sudden damage caused by lightning stroke, surge and heavy high-power capacitive load and inductive load of a power supply line; compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the power supply line judging module is arranged to detect whether the power supply line is connected with the power supply circuit of the charger, and the power supply line is disconnected with the power supply circuit of the charger through the power supply line access control module when the power supply line is connected with the power supply circuit, so that single-phase power, two-phase power and three-phase power can be used at will, and the power supply circuit is not limited; the electric connection sequence is not required, the electric connection polarity operation is not limited, the shell is not electrified and does not leak electricity, and a user provides safety protection to prevent human body from electric shock; an anti-interference filter module is arranged to avoid interference between other connecting equipment of the power supply line and the charger; and a lightning surge module is arranged to provide lightning and surge protection.
Description
Technical Field
The utility model relates to the field of power protection, in particular to an input alternating current electric polarity misconnection protection circuit.
Background
Referring to fig. 1, the conventional battery charger or the product of the same electric appliance is a type of safety standard electric appliance, wherein the ground wire is connected to the shell of the product, so that the shell is grounded to play a role of leakage protection, and the electric appliance product is safer for human body use.
Under the common application working condition, IN-A is connected with an input alternating current zero line, IN-B is connected with an input alternating current live line, IN-C is connected with an input alternating current power grid ground line, and the method is A mainstream wiring method IN the current industry. The user must use the wiring according to the wiring specification of the manufacturer. Otherwise, the product does not work, or burns out the product, or the human body is at risk of electric shock.
Under special application conditions, when input is connected with single-phase electricity or two-phase electricity, IN-C is connected with A live wire, IN-B is connected with A zero wire and IN-A is connected with A ground wire, so that as shown IN figure 1, A metal shell of A product charger is electrified, and A human body is directly shocked under the condition of unknowing, so that the human body is directly dangerous. The product does not work or burns out after the wrong wire connection.
Under another special application condition, when the input is connected with three-phase power input, three wires are phase wires, commonly called fire wires, IN-A is connected with an input alternating current fire wire L1, IN-B is connected with an input alternating current fire wire L2, and IN-C is connected with an input alternating current fire wire L3. Thus, as shown in fig. 1, the metal shell of the product charger is electrified, so that the human body is directly shocked under the condition of unknowing, and the human body safety is directly critical. Although an electric leakage switch can be installed in the power grid, the situation that the tripping time of the action is delayed after the detection of the electric leakage switch is considered, the actual situation that the human body is electrified before and the tripping occurs after the human body is electrified.
Therefore, a related protection circuit is needed to provide safety protection under the control of common or special application, so as to avoid danger to users.
Disclosure of utility model
The utility model aims to provide an input alternating current electric polarity misconnection protection circuit for solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an input alternating current polarity misconnection protection circuit comprising:
The lightning surge protection module is used for protecting the circuit from sudden damage caused by lightning stroke, surge and heavy high-power capacitive load and inductive load of a power supply line;
The anti-interference filtering module is used for avoiding the influence of interference signals generated by other equipment and a charger on the power supply line;
The power supply line judging module is used for judging that the access power supply line is a live wire, a zero wire and a ground wire and outputting a detection signal to the power supply line access control module;
The power supply line access control module is used for disconnecting the power supply line and a power supply loop of the charger when the power supply line is accessed in error;
The lightning surge protection module is connected with the anti-interference filter module and the power supply line judging module, and the power supply line judging module is connected with the power supply line access control module.
As still further aspects of the utility model: the anti-interference filtering module comprises a common mode choke LF4 and a common mode choke LF5, wherein a first end of the common mode choke LF4 is connected with one end of a capacitor C224 and a first end of a lightning surge module, a fourth end of the common mode choke LF4 is connected with a second end of the lightning surge module and the other end of the capacitor C224, a second end of the common mode choke LF4 is connected with one end of a resistor R254, one end of a capacitor C217, one end of a capacitor C225 and a first end of the common mode choke LF5, a third end of the common mode choke LF4 is connected with one end of a resistor R261, one end of a capacitor C230, the other end of the capacitor C225 and a fourth end of the common mode choke LF5, the other end of the resistor R254 is connected with the other end of the resistor R261, the other end of the capacitor C217 is connected with one end of the capacitor C230 and the OUT-C end of a charger, the third end of the common mode choke LF5 is connected with one end of the capacitor C227 and the other end of the charger is connected with the OUT-C end of the capacitor C218 and the OUT-C end of the charger.
As still further aspects of the utility model: the power supply line judging module comprises a resistor string, a capacitor C502, a diode D501 and a diode D500, wherein one end of the resistor string is connected with the first end of the lightning surge module, the other end of the resistor string is connected with one end of the capacitor C502, the negative electrode of the diode D501 and the first end of the power supply line access module, the other end of the capacitor C502 is connected with the positive electrode of the diode D501, the positive electrode of the diode D500 and the second end of the power supply line access module, and the negative electrode of the diode D500 is connected with the power supply line IN-C.
As still further aspects of the utility model: the lightning surge module comprises A piezoresistor TVR1, A piezoresistor TVR2, A piezoresistor TVR3 and A ceramic discharge gas tube G1, wherein one end of the piezoresistor TVR1 is connected with one end of the piezoresistor TVR2, A power supply line IN-A, A first end of an anti-interference filter module and A first end of A power supply line judging module, the other end of the piezoresistor TVR1 is connected with one end of the piezoresistor TVR3, A second end of the anti-interference filter module, one end of A fuse F3 and one end of A fuse F4, the other end of the fuse F3 is connected with the other end of the fuse F4 and the power supply line IN-B, the other end of the piezoresistor TVR2 is connected with the other end of the piezoresistor TVR3 and one end of the ceramic discharge gas tube G1, and the other end of the ceramic discharge gas tube G1 is connected with the power supply line IN-C.
As still further aspects of the utility model: the resistor string comprises a resistor R507, a resistor R503, a resistor R504 and a resistor R508, wherein the resistor R507, the resistor R503, the resistor R504 and the resistor R508 are sequentially connected in series, the non-series end of the resistor R507 is connected with the first end of the lightning surge module, and the non-series end of the resistor R508 is connected with the negative electrode of the diode D501.
As still further aspects of the utility model: the power supply line access module comprises an optocoupler U500, a MOS tube Q500, a triode Q503 and a relay K4, wherein the first end of the optocoupler U500 is connected with the second end of the power supply line judgment module, the second end of the optocoupler U500 is connected with the third end of the power supply line judgment module, the third end of the optocoupler U500 is connected with one end of a resistor R505, one end of a capacitor C143 and the negative electrode of a diode ZD502, the fourth end of the optocoupler U500 is grounded, the other end of the resistor R505 is connected with a power supply voltage VCC-AUX, the other end of the capacitor C143 is grounded, the positive electrode of the diode ZD502 is connected with one end of a resistor R511, the G electrode of the MOS tube Q500 is grounded, the other end of the MOS tube Q509 is connected with the base electrode of the resistor Q503, one end of the resistor R510, the other end of the triode Q503 is connected with the other end of the resistor R510, the negative electrode of the diode D502, the other end of the diode Q502 is connected with the negative electrode of the resistor D4, the other end of the relay K4 is grounded, and the other end of the relay K4 is connected with the third end of the relay K4 is grounded.
As still further aspects of the utility model: the power supply line access module comprises an optocoupler U500, a triode Q12, a triode Q503 and a relay K4, wherein the first end of the optocoupler U500 is connected with the second end of the power supply line judgment module, the second end of the optocoupler U500 is connected with the third end of the power supply line judgment module, the third end of the optocoupler U500 is connected with one end of a resistor R505, one end of a capacitor C143 and the negative electrode of a diode ZD502, the fourth end of the optocoupler U500 is grounded, the other end of the resistor R505 is connected with a power supply voltage VCC-AUX, the other end of the capacitor C143 is grounded, the positive electrode of the diode ZD502 is connected with one end of a resistor R511, the base electrode of the triode Q12 is grounded, the other end of the triode Q12 is connected with one end of a resistor R509, the other end of the resistor R509 is connected with the base electrode of the resistor R510, one end of the triode Q503 is connected with the power supply voltage, the other end of the resistor R506 is connected with the negative electrode of the diode D502, the other end of the relay K4 is grounded, the positive electrode of the relay K4 is connected with the positive electrode of the relay K4, and the other end of the relay K4 is grounded.
As still further aspects of the utility model: the power supply line access module comprises an optocoupler U500, a digital triode Q10, a digital triode Q11 and a relay K4, wherein the first end of the optocoupler U500 is connected with the second end of the power supply line judgment module, the second end of the optocoupler U500 is connected with the third end of the power supply line judgment module, the third end of the optocoupler U500 is connected with one end of a resistor R505, one end of a capacitor C143 and the negative electrode of a diode ZD502, the fourth end of the optocoupler U500 is grounded, the other end of the resistor R505 is connected with a power supply voltage VCC-AUX, the other end of the capacitor C143 is grounded, the positive electrode of the diode ZD502 is connected with the first end of the digital triode Q10, the second end of the digital triode Q10 is grounded, the third end of the digital triode Q10 is connected with the first end of the digital triode Q11, the second end of the digital triode Q11 is connected with the power supply voltage VCC, the third end of the built-IN resistor Q11 is connected with one end of a resistor R506, the other end of the resistor R506 is connected with the negative electrode of a diode D, the first end of the relay K4 is grounded, the positive electrode of the diode D502 is grounded, the second end of the relay K4 is grounded, and the fourth end of the relay K4 is connected with the third end of the relay K4 is connected with the power supply line C4.
Compared with the prior art, the utility model has the beneficial effects that: the utility model detects whether the power supply line is connected by mistake by arranging the power supply line judging module, and when the power supply line is connected by mistake, the power supply line is connected with the control module to disconnect the power supply loop of the power supply line and the charger, in the single-phase input alternating current, once the power supply line is connected by mistake, the product does not work, the product is not burnt out, the shell is not electrified, no electricity leakage occurs, and the safety protection is provided for a user, and the electric shock of a human body is prevented; in the three-phase input alternating current, once the misplaced wire is connected, the product can also work normally by using two-phase electricity, under special working conditions, the three-phase electricity is used as two-phase electricity, the product compatibility is stronger, and the single-phase electricity, the two-phase electricity and the three-phase electricity can be used at will without limitation; the electric connection sequence is not required, the electric connection polarity operation is not limited, the shell is not electrified and does not leak electricity, and a user provides safety protection to prevent human body from electric shock; an anti-interference filter module is arranged to avoid interference between other connecting equipment of the power supply line and the charger; and a lightning surge module is arranged to provide lightning and surge protection.
Drawings
Fig. 1 is a circuit diagram of a conventional power supply for a powered device.
Fig. 2 is a circuit diagram of a first embodiment of an input ac polarity misconnection protection circuit.
FIG. 3 is a circuit diagram of a second embodiment of an input AC polarity misconnection protection circuit.
Fig. 4 is a circuit diagram of a third embodiment of an input ac polarity misconnection protection circuit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 2, 3 or 4, an input ac polarity error protection circuit includes:
The lightning surge protection module is used for protecting the circuit from sudden damage caused by lightning stroke, surge and heavy high-power capacitive load and inductive load of a power supply line;
The anti-interference filtering module is used for avoiding the influence of interference signals generated by other equipment and a charger on the power supply line;
The power supply line judging module is used for judging that the access power supply line is a live wire, a zero wire and a ground wire and outputting a detection signal to the power supply line access control module;
The power supply line access control module is used for disconnecting the power supply line and a power supply loop of the charger when the power supply line is accessed in error;
The lightning surge protection module is connected with the anti-interference filter module and the power supply line judging module, and the power supply line judging module is connected with the power supply line access control module.
In this embodiment: referring to fig. 2, 3 or 4, the power supply line judging module includes a resistor string, a capacitor C502, a diode D501, and a diode D500, wherein one end of the resistor string is connected to the first end of the lightning surge module, the other end of the resistor string is connected to one end of the capacitor C502, the negative electrode of the diode D501, and the first end of the power supply line access module, the other end of the capacitor C502 is connected to the positive electrode of the diode D501, the positive electrode of the diode D500, and the second end of the power supply line access module, and the negative electrode of the diode D500 is connected to the power supply line IN-C.
Under normal power supply (zero line N and ground line G), no voltage difference is formed at the diode D501, and under the condition of electric leakage and the voltage difference can not reach the starting voltage of the photodiode in the optocoupler U500, the conduction of the phototriode in the optocoupler U500 is not triggered; under abnormal power supply, a voltage difference is formed at the diode D501, the cathode of the diode D501 is positive, the anode of the diode D501 is negative, and the optocoupler U500 is turned on in a positive-to-negative mode. The diode D501 plays a role in protecting the optocoupler U500, plays a clamping function when strong electricity is too high, and simultaneously prevents negative electricity from reversely exceeding the breakdown damage of the optocoupler U500.
In this embodiment: referring to fig. 2, 3 or 4, the lightning surge module includes A varistor TVR1, A varistor TVR2, A varistor TVR3, and A ceramic discharge gas tube G1, one end of the varistor TVR1 is connected to one end of the varistor TVR2, A power supply line IN-A, A first end of an anti-interference filter module, and A first end of A power supply line judging module, the other end of the varistor TVR1 is connected to one end of the varistor TVR3, A second end of the anti-interference filter module, one end of A fuse F3, one end of A fuse F4, the other end of the fuse F3 is connected to the other end of the fuse F4, the power supply line IN-B, the other end of the varistor TVR2 is connected to the other end of the varistor TVR3, one end of the ceramic discharge gas tube G1, and the other end of the ceramic discharge gas tube G1 is connected to the power supply line IN-C.
The piezoresistors TVR1, TVR2 and TVR3 and the ceramic gas discharge tube G1 are arranged to protect the rear-stage circuit from being damaged by lightning and surge. The power supply circuit is not damaged by abrupt change caused by heavy high-power capacitive load and inductive load of the power supply circuit. Meanwhile, the power supply line judging module is further protected.
In this embodiment: referring to fig. 2 or fig. 3 or fig. 4, the anti-interference filtering module includes a common mode choke LF4, a common mode choke LF5, a first end of the common mode choke LF4 is connected to one end of a capacitor C224, a first end of a lightning surge module, a fourth end of the common mode choke LF4 is connected to a second end of the lightning surge module, the other end of the capacitor C224, a second end of the common mode choke LF4 is connected to one end of a resistor R254, one end of a capacitor C217, one end of a capacitor C225, a first end of the common mode choke LF5, a third end of the common mode choke LF4 is connected to one end of a resistor R261, one end of a capacitor C230, the other end of the capacitor C225, a fourth end of the common mode choke LF5, the other end of the resistor R254 is connected to the other end of the resistor R261, the other end of the capacitor C217 is connected to the other end of the capacitor C230, the OUT-C end of the charger, the second end of the common mode choke LF5 is connected to one end of the capacitor C218, the OUT-a terminal of the charger, the first end of the common mode choke LF5 is connected to the other end of the capacitor C227, the other end of the capacitor OUT-B of the charger, and the other end of the capacitor C-C227 is connected to the other end of the charger.
The alternating current is input into an EMI circuit and an EMC circuit which are respectively formed by a common mode choke LF4 and a common mode choke LF5 and a plurality of capacitors, and the two-stage pi-type high-frequency and low-frequency filtering prevents other access devices of the power supply line IN-A, IN-B and the accessed charger from interfering with each other. The charger is not interfered by the mains power, and the interference generated by the mains power cannot enter the charger.
In this embodiment: referring to fig. 2, 3 or 4, the resistor string includes a resistor R507, a resistor R503, a resistor R504, and a resistor R508, where the resistor R507, the resistor R503, the resistor R504, and the resistor R508 are sequentially connected in series, a non-series end of the resistor R507 is connected to a first end of the lightning surge module, and a non-series end of the resistor R508 is connected to a negative electrode of the diode D501.
The resistor string is composed of one or more resistors, in the application, the number of the resistors is particularly 4, and the number of the resistors of the resistor string is not limited in actual use.
In the first embodiment: referring to fig. 2, the power supply line access module includes an optocoupler U500, a MOS transistor Q500, a triode Q503, and a relay K4, where a first end of the optocoupler U500 is connected to a second end of the power supply line determination module, a second end of the optocoupler U500 is connected to a third end of the power supply line determination module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502, a fourth end of the optocoupler U500 is grounded, another end of the resistor R505 is connected to a supply voltage VCC-AUX, another end of the capacitor C143 is grounded, a positive electrode of the diode ZD502 is connected to one end of the resistor R511, a G electrode of the MOS transistor Q500 is connected to one end of the resistor R509, another end of the resistor R509 is connected to a base electrode of the resistor R503, an emitter of the triode Q503 is connected to another end of the resistor R510, a supply voltage VCC is connected to one end of the resistor ZD 503, another end of the resistor R506 is connected to another end of the diode R506, another end of the resistor D502 is connected to a collector electrode of the relay K4 is connected to a third end of the relay K4, and a third end of the relay K4 is connected to a fourth end of the relay K4 is connected to a third end of the relay K4 is suspended.
The power supply line access module is divided into an optocoupler isolation input part and a detection trigger part, the control signals are isolated and output through the device combination taking the optocoupler U500 as a core, safety is ensured, the input alternating current strong current and the control part weak current are isolated, mutual noninterference is formed, direct work can be realized without common ground, the optocoupler U500 primary direct power supply is omitted, a complex and unreliable traditional circuit is omitted, the input voltage compatibility range is ultra-wide, and the input voltage can be reliably detected under the condition of 75V-460Vac input electricity. The control signal is output to power the coil of the relay K4 by a combination of devices with the transistor Q503 as a core.
Under the normal condition of wiring, when INA is a zero line N, IN-B is a live line L, INC is a ground line G, stable voltage is not formed on a diode D501, a capacitor C502 is used for filtering noise interference of a non-power frequency signal, the detection voltage is lower than the conduction starting voltage of a photo diode of an optocoupler U500, a photo transistor IN the optocoupler U500 is cut off, a resistor R505 is pulled up to a power supply VCC under the action of the resistor R505, the capacitor C143 stores energy to stabilize direct current, so that the cathode of the diode ZD502 is high level and exceeds the voltage stabilizing value of the ZD502, ZD502 breaks down and is conducted, the G of a MOS transistor Q500 is extremely high, the MOS transistor Q500 is triggered to be conducted, the lower end of the resistor R509 is connected with the DS pole to be conducted to the ground, the base voltage of the triode Q503 is pulled down, the voltage VCC of an emitter is output to a collector, the voltage VCC is limited and protected to the first end of a relay K4 through a resistor R506, the coils of the first end and the second end of the relay K4 are electrically adsorbed by a metal piece to move the power supply line from the third end to the fourth end (K4) so that the power supply line IN-C is normally-on, and the power line C-to be connected to the live line L-ground line L, the live line L-ground line L is charged, and the live line L-ground line is charged;
Under the condition of wiring errors, a stable voltage is formed at a diode D501, a capacitor C502 is used for filtering clutter interference of non-power frequency signals, the detection voltage is higher than the conduction start voltage of an internal photodiode of an optocoupler U500, the internal photodiode of the optocoupler U500 is intermittently conducted, a resistor R505 and a capacitor C143 form RC charge and discharge, a power frequency square wave signal transmitted by the optocoupler U500 is converted into direct-current stable voltage, the negative electrode of the diode ZD502 is low level, ZD502 cannot break down and conduct, the very low level of a MOS transistor Q500G is zero under the action of R511, the electrodes Q500D and S of the MOS transistor are cut off, the emitter and collector of the triode Q503 are in equipotential, the coil of a relay K4 is in no electricity, the relay K4 is not in operation, the normally-closed contact is kept conducting, and the internal third end is connected with a fifth end. The detailed wiring conditions are shown in the following table:
In a second embodiment: referring to fig. 3, the power supply line access module includes an optocoupler U500, a triode Q12, a triode Q503, and a relay K4, where a first end of the optocoupler U500 is connected to a second end of the power supply line judgment module, a second end of the optocoupler U500 is connected to a third end of the power supply line judgment module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502 is grounded, another end of the resistor R505 is connected to a power supply voltage VCC-AUX, another end of the capacitor C143 is grounded, an anode of the diode ZD502 is connected to one end of the resistor R511, a base of the triode Q12 is grounded, another end of the resistor R511 is connected to one end of the collector of the triode Q12, another end of the resistor R509 is connected to a base of the triode Q503, one end of the resistor R510, another end of the triode Q503 is connected to another end of the resistor R510, a voltage, one end of the resistor ZD 503 is connected to another end of the resistor R506, another end of the resistor R506 is connected to another end of the diode D502, another end of the relay D4 is connected to the negative electrode of the relay D4, and another end of the relay D4 is connected to the third end of the relay D4 is connected to the positive end of the relay K4 is grounded, and the other end of the relay is connected to the positive end of the relay is connected to the relay 4 is connected to the positive end of the relay 4 is connected to the relay.
The circuit is also divided into two parts, wherein the control signal is isolated and output by the device combination taking the optocoupler U500 as a core, and the control signal is output to the relay K4 by the device combination taking the triode Q503 as a core. The voltage VCC-AUX is connected to the voltage VCC, and is actually the same voltage.
The second embodiment also conducts power only if the wiring is normal, and does not supply power in the rest of the conditions.
In a third embodiment: referring to fig. 4, the power supply line access module includes an optocoupler U500, a digital triode Q10, a digital triode Q11, and a relay K4, wherein a first end of the optocoupler U500 is connected to a second end of the power supply line judgment module, a second end of the optocoupler U500 is connected to a third end of the power supply line judgment module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502, a fourth end of the optocoupler U500 is grounded, the other end of the resistor R505 is connected to a power supply voltage VCC-AUX, the other end of the capacitor C143 is grounded, a positive electrode of the diode ZD502 is connected to a first end of the digital triode Q10, a second end of the digital triode Q10 is grounded, a third end of the digital triode Q10 is connected to a first end of the digital triode Q11, a second end of the digital triode Q11 is connected to the power supply voltage VCC, a third end of the built-IN resistor Q11 is connected to one end of the resistor R506, the other end of the resistor R506 is connected to a negative electrode of the diode D502, a first end of the relay K4 is grounded, the positive electrode of the diode D502 is grounded, the other end of the relay K4 is grounded, and the third end of the relay K4 is connected to the third end of the relay K4 is grounded, and the third end of the relay K is connected to the relay is suspended to the fifth end of the relay is connected to the relay C4.
The circuit is also divided into two parts, wherein the control signal is isolated and output by a device combination taking the optocoupler U500 as a core, and the control signal is output to the relay K4 by a device combination taking the digital triode Q11 as a core. The voltage VCC-AUX is connected to the voltage VCC, and is actually the same voltage.
The third embodiment also conducts power only if the wiring is normal, and does not supply power in the rest of the conditions.
The working principle of the utility model is as follows: the lightning surge protection module is used for protecting the circuit from sudden damage caused by lightning stroke, surge and heavy high-power capacitive load and inductive load of a power supply line; the anti-interference filtering module is used for avoiding the influence of interference signals generated by other equipment and a charger on a power supply line; the power supply line judging module is used for judging that the access power supply line is a live wire, a zero wire and a ground wire and outputting a detection signal to the power supply line access control module; and when the power supply line is connected with an error, the power supply line access control module is used for disconnecting the power supply line and a power supply loop of the charger.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. An input alternating current polarity misconnection protection circuit is characterized in that:
The input alternating current electric polarity misconnection protection circuit comprises:
The lightning surge protection module is used for protecting the circuit from sudden damage caused by lightning stroke, surge and heavy high-power capacitive load and inductive load of a power supply line;
The anti-interference filtering module is used for avoiding the influence of interference signals generated by other equipment and a charger on the power supply line;
The power supply line judging module is used for judging that the access power supply line is a live wire, a zero wire and a ground wire and outputting a detection signal to the power supply line access control module;
The power supply line access control module is used for disconnecting the power supply line and a power supply loop of the charger when the power supply line is accessed in error;
The lightning surge protection module is connected with the anti-interference filter module and the power supply line judging module, and the power supply line judging module is connected with the power supply line access control module;
The anti-interference filtering module comprises a common mode choke LF4 and a common mode choke LF5, wherein a first end of the common mode choke LF4 is connected with one end of a capacitor C224 and a first end of a lightning surge module, a fourth end of the common mode choke LF4 is connected with a second end of the lightning surge module and the other end of the capacitor C224, a second end of the common mode choke LF4 is connected with one end of a resistor R254, one end of a capacitor C217, one end of a capacitor C225 and a first end of the common mode choke LF5, a third end of the common mode choke LF4 is connected with one end of a resistor R261, one end of a capacitor C230, the other end of the capacitor C225 and a fourth end of the common mode choke LF5, the other end of the resistor R254 is connected with the other end of the resistor R261, the other end of the capacitor C217 is connected with one end of the capacitor C230 and the OUT-C end of a charger, the third end of the common mode choke LF5 is connected with one end of the capacitor C227 and the other end of the charger is connected with the OUT-C end of the capacitor C218 and the OUT-C end of the charger.
2. The input ac electric polarity misconnection protection circuit of claim 1, wherein the lightning surge module comprises A varistor TVR1, A varistor TVR2, A varistor TVR3, and A ceramic discharge gas tube G1, one end of the varistor TVR1 is connected to one end of the varistor TVR2, A power supply line IN-A, A first end of the anti-interference filter module, and A first end of the power supply line judgment module, the other end of the varistor TVR1 is connected to one end of the varistor TVR3, A second end of the anti-interference filter module, one end of the fuse F3, one end of the fuse F4, the other end of the fuse F3 is connected to the other end of the fuse F4, the power supply line IN-B, the other end of the varistor TVR2 is connected to the other end of the varistor TVR3, one end of the ceramic discharge gas tube G1, and the other end of the ceramic discharge gas tube G1 is connected to the power supply line IN-C.
3. The input ac electric polarity misconnection protection circuit of claim 1, wherein the power supply line judging module comprises a resistor string, a capacitor C502, a diode D501, and a diode D500, one end of the resistor string is connected to the first end of the lightning surge module, the other end of the resistor string is connected to one end of the capacitor C502, the negative electrode of the diode D501, the first end of the power supply line access module, the other end of the capacitor C502 is connected to the positive electrode of the diode D501, the positive electrode of the diode D500, the second end of the power supply line access module, and the negative electrode of the diode D500 is connected to the power supply line IN-C.
4. The input ac electric polarity misconnection protection circuit of claim 3, wherein the resistor string comprises a resistor R507, a resistor R503, a resistor R504, and a resistor R508, the resistor R507, the resistor R503, the resistor R504, and the resistor R508 are sequentially connected in series, the non-series end of the resistor R507 is connected to the first end of the lightning surge module, and the non-series end of the resistor R508 is connected to the negative electrode of the diode D501.
5. The circuit of any of claims 1-4, wherein the power supply line access module comprises an optocoupler U500, a MOS transistor Q500, a triode Q503, and a relay K4, wherein a first end of the optocoupler U500 is connected to a second end of the power supply line determination module, a second end of the optocoupler U500 is connected to a third end of the power supply line determination module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502, a fourth end of the optocoupler U500 is grounded, another end of the resistor R505 is connected to a supply voltage VCC-AUX, another end of the capacitor C143 is grounded, an anode of the diode ZD502 is connected to one end of the resistor R511, a G electrode of the MOS transistor Q500 is grounded, an S electrode of the MOS transistor Q500 is connected to one end of the resistor R509, another end of the resistor R509 is connected to a base of the resistor R510, another end of the resistor R510 is connected to another end of the triode Q503, another end of the resistor R510 is connected to the power supply voltage VCC, another end of the triode Q506 is connected to the second end of the relay K4 is connected to the positive electrode of the relay K4, and another end of the triode Q506 is connected to the third end of the relay K4 is grounded, and another end of the relay K4 is connected to the other end of the relay K4 is grounded.
6. The circuit of any of claims 1-4, wherein the power supply line access module comprises an optocoupler U500, a triode Q12, a triode Q503, and a relay K4, wherein a first end of the optocoupler U500 is connected to a second end of the power supply line judgment module, a second end of the optocoupler U500 is connected to a third end of the power supply line judgment module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502, a fourth end of the optocoupler U500 is grounded, the other end of the resistor R505 is connected to a supply voltage VCC-AUX, the other end of the capacitor C143 is grounded, an anode of the diode ZD502 is connected to one end of a resistor R511, a base of the triode Q12, the other end of the resistor R511 is grounded, an emitter of the triode Q12 is connected to one end of a resistor R509, the other end of the resistor R509 is connected to a base of the triode Q503, one end of the resistor R510, the emitter of the resistor Q503 is connected to another end of the resistor R510, the other end of the triode Q503 is connected to a voltage, the other end of the VCC is connected to the other end of the resistor Q502, the other end of the resistor K506 is connected to the third end of the relay K4 is connected to the positive end of the relay 4, and the negative end of the relay is connected to the negative end of the relay 4 is grounded.
7. The circuit of any one of claims 1-4, wherein the power supply line access module comprises an optocoupler U500, a digital triode Q10, a digital triode Q11, and a relay K4, wherein a first end of the optocoupler U500 is connected to a second end of the power supply line judgment module, a second end of the optocoupler U500 is connected to a third end of the power supply line judgment module, a third end of the optocoupler U500 is connected to one end of a resistor R505, one end of a capacitor C143, a negative electrode of a diode ZD502, a fourth end of the optocoupler U500 is grounded, another end of the resistor R505 is connected to a supply voltage VCC-AUX, another end of the capacitor C143 is grounded, an anode of the diode ZD502 is connected to a first end of the digital triode Q10, a second end of the digital triode Q10 is grounded, a third end of the digital triode Q10 is connected to a first end of the digital triode Q11, a second end of the digital triode Q11 is connected to a third end of a resistor R506, another end of the resistor R506 is connected to one end of the diode D502, another end of the diode D502 is connected to a negative electrode of the relay K4, another end of the relay K4 is grounded, and a third end of the relay K4 is connected to a third end of the capacitor K4 is grounded, and a fifth end of the relay is connected to the positive electrode of the relay K4 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322834029.7U CN221467387U (en) | 2023-10-20 | 2023-10-20 | Input alternating current polarity misconnection protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322834029.7U CN221467387U (en) | 2023-10-20 | 2023-10-20 | Input alternating current polarity misconnection protection circuit |
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| CN221467387U true CN221467387U (en) | 2024-08-02 |
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| CN202322834029.7U Active CN221467387U (en) | 2023-10-20 | 2023-10-20 | Input alternating current polarity misconnection protection circuit |
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