CN212969039U - Ballast leakage protection circuit - Google Patents
Ballast leakage protection circuit Download PDFInfo
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- CN212969039U CN212969039U CN202021717395.4U CN202021717395U CN212969039U CN 212969039 U CN212969039 U CN 212969039U CN 202021717395 U CN202021717395 U CN 202021717395U CN 212969039 U CN212969039 U CN 212969039U
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Abstract
The utility model relates to a ballast earth leakage protection circuit belongs to the technical field of ballast for reduce the harm that the ballast electric leakage brought among the prior art, it is including the detection control circuit who is used for detecting the electric leakage detection circuit whether the ballast electric leakage, is used for controlling the connection control circuit of ballast and supply circuit connected state and is used for controlling the electric leakage detection circuit whether to start. The leakage detection circuit is started under the control of the detection control circuit to detect the leakage of the ballast, and the ballast is controlled to be disconnected by the power supply circuit when the ballast leaks electricity, so that the possibility that the ballast and a light source driven by the ballast cannot work normally due to the leakage of electricity is reduced, and the possibility that safety accidents are caused by electric shock of personnel is reduced.
Description
Technical Field
The utility model belongs to the technical field of the technique of ballast and specifically relates to a ballast earth leakage protection circuit is related to.
Background
Ballasts are devices that act to limit current at a light source and produce an instantaneous high voltage.
In the working process of the ballast, electric leakage can occur due to the influence of self electrical structure stability factors, environmental factors and the like, and once the electric leakage occurs to the ballast, the normal work of the ballast and the normal work of a light source can be influenced, and in addition, people can be possibly subjected to electric shock to cause safety accidents.
How to avoid the problem that the ballast and the light source driven by the ballast cannot work normally due to electric leakage and avoid safety accidents caused by electric shock of personnel is a problem to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electronic ballast earth leakage protection circuit, its advantage lies in its can reduce because of the ballast that the electric leakage leads to and the unable normal work's of driven light source, reduction personnel electric shock lead to the possibility of incident.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a ballast leakage protection circuit comprising:
the leakage detection circuit is connected with the ballast and is used for detecting whether the ballast leaks electricity or not so as to output a leakage detection signal when the ballast leaks electricity;
the connection control circuit is connected between the ballast and the power supply circuit and is used for controlling the connection state of the ballast and the power supply circuit; the connection control circuit is connected with the electric leakage detection circuit, receives the electric leakage detection signal and outputs a power supply cut-off signal when receiving the electric leakage detection signal, and the power supply cut-off signal enables the ballast to be disconnected with the power supply circuit;
the detection control circuit is used for controlling the on-off of the electric leakage detection circuit, is connected with the electric leakage detection circuit, and comprises a first signal access end, wherein the first signal access end is used for controlling the detection control circuit so as to control the electric leakage detection circuit and is connected with the control circuit;
by adopting the technical scheme, the detection control circuit can control the on-off of the leakage detection circuit so as to control whether the whole leakage protection circuit is started, namely whether the leakage protection circuit is in an automatic leakage protection state; when the leakage protection circuit is in an automatic leakage protection state, namely the leakage detection circuit is in a starting state, once the ballast leaks electricity, the leakage detection circuit outputs a leakage detection signal, the connection control circuit outputs a power supply cut-off signal to cut off the connection between the ballast and the power supply circuit and cut off the power supply of the ballast, so that the possibility that the ballast and a light source driven by the ballast cannot work normally due to the leakage electricity is reduced, and the possibility that safety accidents are caused by electric shock of personnel is reduced.
The present invention may be further configured in a preferred example, wherein the leakage detecting circuit includes:
the controllable switch element is connected between the connection control circuit and the power supply circuit and used for controlling the connection state of the connection control circuit and the power supply circuit, and when the controllable switch element is switched on, the leakage detection signal is output and enables the connection control circuit to output a power supply cut-off signal;
and the detection end of the leakage detection chip is connected with the ballast to detect whether the ballast leaks electricity, the output end of the leakage detection chip is connected with the controllable switch element, and a leakage state signal is output when the ballast leaks electricity and enables the controllable switch element to be switched on.
By adopting the technical scheme, when the ballast leaks electricity, the electric leakage detection chip outputs an electric leakage state signal, the electric leakage state signal enables the controllable switch element to be switched on, the controllable switch element can output an electric leakage detection signal, the connection control circuit can output a power supply cut-off signal, and therefore the connection between the ballast and the power supply circuit is cut off.
The present invention may be further configured in a preferred example, wherein the connection control circuit includes:
relay switch element, including coil and normally closed contact, the coil with controllable switch element series connection is in supply circuit, contact series connection set up in between ballast and the supply circuit, the power cut-off signal promptly the normally closed contact disconnection.
By adopting the technical scheme, the connection control circuit is set as the relay switch element, so that voltage isolation can be performed between the leakage detection circuit and the ballast and between the leakage detection circuit and the power supply circuit, and electromagnetic interference caused by high-level voltage to low-level voltage is avoided.
The present invention can be further configured in a preferred example, wherein the connection control circuit further comprises a second current limiting resistor, and the second current limiting resistor is connected in series with the coil of the relay switch element and the controllable switch element.
By adopting the technical scheme, the second current-limiting resistor can limit the current flowing through the relay switch element and the controllable switch element, and the possibility that the current in the coil of the relay switch element is overlarge and the coil is damaged is reduced.
The present invention may be further configured in a preferred example, wherein the detection control circuit comprises:
the first switch element is connected and arranged between the electric leakage detection chip and the power supply circuit;
the first switch circuit is used for outputting a switch trigger signal, the output end of the first switch circuit is connected with the first switch element, and the switch trigger signal enables the first switch element to be conducted; the first switch circuit includes the first signal access terminal, which controls the first switch circuit.
Through adopting above-mentioned technical scheme, first switch circuit output switch trigger signal can be controlled to first signal incoming end, and switch trigger signal can make first switch element switch on, and when first switch element switched on, the power supply circuit is connected to the electric leakage detection chip to the realization to the power supply of electric leakage detection chip, thereby make the electric leakage detection chip can carry out the electric leakage detection work of ballast, the electric leakage detection circuit can carry out the electric leakage detection work of ballast promptly.
The utility model discloses can further configure to in a preferred example, first switch circuit sets up in the first switch tube of power, low stabilivolt, first current-limiting resistance including establishing ties in proper order, first current-limiting resistance is close to the anodal setting of power, and first switch circuit still sets up in the high stabilivolt at the both ends of the circuit of low stabilivolt and first current-limiting resistance series connection including parallelly connected, the control end of first switch tube is connected first signal incoming end, the anodal tip of power is kept away from to first current-limiting resistance is used for exporting switch trigger signal.
By adopting the technical scheme, the first signal access end can control the connection and disconnection of the first switch tube so as to control the voltage of the end part of the first current-limiting resistor far away from the anode of the power supply to be the voltage stabilizing voltage of the high voltage-stabilizing tube or the voltage stabilizing voltage of the low voltage-stabilizing tube, and thus whether the first switch circuit outputs the switch trigger signal or not is controlled.
The present invention may be further configured in a preferred example, wherein the first switch circuit further comprises:
first divider unit, including first high divider resistance and the first low divider resistance that establishes ties and set up, first high divider resistance keeps away from first low divider resistance's end connection power negative pole, first low divider resistance keeps away from first high divider resistance's end connection first signal incoming end, first high divider resistance is close to first divider resistance's end connection the control end of first switch tube.
Through adopting above-mentioned technical scheme, adopt the form that first high divider resistance carries out the partial pressure to first signal incoming end access voltage signal among the first partial pressure unit, insert first switch tube control end with first signal incoming end access voltage signal in order to control first switch tube break-make, reduced the possibility of first switch tube damage, improved first switch circuit's stability and reliability to the overall stability and the reliability of earth leakage protection circuit have been improved.
The present invention can be further configured in a preferred example, wherein the ballast leakage protection circuit further comprises:
and the active cut-off circuit is arranged at two ends of the controllable switch element, is used for connecting two ends of the controllable switch element and comprises a second signal access end, and the second signal access end is used for controlling the active cut-off circuit so as to control whether two ends of the controllable switch element are connected or not.
Through adopting above-mentioned technical scheme, initiative cutting off circuit can be when electric leakage detection chip became invalid, unable control controllable switch component disconnection, and the signal that directly inserts through the second signal incoming end makes controllable switch component both ends connect to control connection control circuit output power cut-off signal makes ballast and supply circuit disconnection, and this kind of mode of initiative control ballast and supply circuit connection status is more convenient.
The utility model discloses can further configure to in a preferred example, initiative cutting off circuit includes the second switch tube, the second switch tube connect in parallel set up in controllable switch element both ends, the control end of second switch tube is connected second signal incoming end.
By adopting the technical scheme, the active cut-off circuit is set to be switched on and off under the control of the signal accessed end access signal and is connected in parallel with the second switch tubes arranged at the two ends of the controllable switch element, the structure is simple, the setting and the control are both convenient, and the cost is low.
The present invention may be further configured in a preferred example, wherein the active cutoff circuit further comprises:
the second divider unit, including the high divider resistance of second and the low divider resistance of second that establish ties and set up, the high divider resistance of second keeps away from the end connection power negative pole that the low divider resistance of second, the low divider resistance of second keeps away from the end connection that the high divider resistance of second signal incoming end, the high divider resistance of second is close to the end connection that the low divider resistance of second the control end of second switch tube.
Through adopting above-mentioned technical scheme, adopt the form that the high divider resistance of second carries out the partial pressure to second signal incoming end access voltage signal among the second voltage division unit, insert second signal incoming end access voltage signal and insert second switch tube control end in order to control the second switch tube break-make, reduced the possibility that the second opened the light pipe damage, improved second switch circuit's stability and reliability to the overall stability and the reliability of earth leakage protection circuit have been improved.
To sum up, the utility model discloses a following at least one useful technological effect:
1. the ballast leakage protection circuit can detect whether the ballast leaks electricity or not, and cut off the connection between the ballast and a power supply circuit when the ballast leaks electricity, so that the possibility that the ballast and a light source driven by the ballast cannot work normally due to the electricity leakage and the possibility of safety accidents caused by electric shock of personnel are reduced;
2. the connection between the ballast and the power supply circuit can be actively cut off through the active cut-off circuit, so that the ballast is powered off to carry out abnormal debugging, fault repairing and the like.
Drawings
Fig. 1 is a schematic circuit diagram of an example of the present invention.
In the figure, 1, a leakage detection circuit; 11. a leakage detection chip; 2. connecting a control circuit; 3. a detection control circuit; 31. a first switching circuit; 311. a first voltage division unit; 4. actively shutting down the circuit; 41. and a second voltage division unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a ballast leakage protection circuit includes a leakage detection circuit 1 for detecting whether a ballast leaks current, a connection control circuit 2 for controlling a connection state of the ballast and a power supply circuit, and a detection control circuit 3 for controlling a connection state of the leakage detection circuit 1 and the power supply circuit. The on-off of the electric leakage detection circuit 1 can be controlled through the detection control circuit 3, when the electric leakage detection circuit 1 is started, the electric leakage detection circuit 1 can detect whether the ballast leaks electricity, when the ballast leaks electricity, the electric leakage detection circuit 1 controls the connection control circuit 2 to control the connection state of the ballast and the power supply circuit and to cut off the power of the ballast, so that the possibility that the ballast and a driven light source cannot work normally due to the electric leakage is reduced, and the possibility that safety accidents are caused by electric shock of personnel is reduced.
The leakage detection circuit 1 is connected with the ballast and used for detecting whether the ballast leaks electricity or not and outputting a leakage detection signal when the ballast leaks electricity.
The leakage detecting circuit 1 includes a leakage detecting chip 11 and a controllable switching element. The detection end of the leakage detection chip 11 is connected to the ballast to detect whether the ballast leaks electricity, and when the ballast leaks electricity, the output end of the leakage detection chip 11 outputs an electric leakage state signal. The trigger end of the controllable switch element is connected with the leakage detection chip 11, and is conducted when receiving the leakage state signal, namely, the leakage detection signal is output.
In one example, the leakage detecting chip 11 is configured as an M5412 chip, the controllable switch element is configured as a thyristor Q1, the cathode of the thyristor Q1 is connected to the negative pole of the power supply, and the anode is connected to the control circuit 2. The ballast comprises a common mode inductor, when the ballast leaks electricity, the two ends of a coil of the common mode inductor generate potential difference, so that a pin 1 and a pin 2 of an M5412 chip are respectively connected to the two ends of the common mode inductor according to the working principle of the M5412 chip, and the end part of the common mode inductor connected with the pin 2 is close to the anode of a power supply. And a 7 pin of the M5412 chip is connected with a control end of the controllable silicon Q1.
In an example, the pin 1 of the M5412 chip is connected to the negative electrode of a power supply through a first filter capacitor C1, so as to filter the voltage connected to the pin 1 of the M5412 chip, and make the operation process of the M5412 chip more stable.
When the ballast leaks electricity, the common mode inductor generates voltage drop from one end close to the anode of the power supply to the other end, so that the voltage connected to the pin 2 of the M5412 chip is higher than the voltage connected to the pin 1, the pin 7 of the M5412 chip outputs a high-level leakage state signal, and the leakage state signal enables the controlled silicon Q1 to be switched on, namely, a leakage detection signal is output.
The mature electric leakage detection chip 11 is used for detecting whether the ballast leaks electricity or not, and outputting an electric leakage detection signal through the conduction of the controllable switch element, so that the detection and control process is simple and convenient, the cost is low, and the detection and control process is reliable.
Preferably, a seventh current limiting resistor R7 and an eighth current limiting resistor R8 are connected in series between the pin 1 and the pin 2 of the M5412 chip, the seventh current limiting resistor R7 is close to the pin 1 of the M5412 chip, the end of the common mode inductor of the ballast, which is far away from the positive pole of the power supply, is connected to the end of the seventh current limiting resistor R7, which is close to the end of the eighth current limiting resistor R8, and the eighth current limiting resistor R8 can reduce the current connected to the pin 2 of the M5412 chip, thereby reducing the possibility of the excessive damage of the access circuit of the M5412 chip.
In addition, the 4 pins of M5412 chip, 7 pins, 8 pins are respectively through fifth filter capacitor C5, seventh filter capacitor C7, eighth filter capacitor C8 connects the power negative pole, and 4 pins are connected to 5 pins, 6 pins are connected the tip that seventh filter capacitor C7 kept away from the power negative pole through sixth filter capacitor C6, thereby realize making 4 pins, 5 pins, 6 pins, 7 pins, the voltage of 8 pins is more stable, improve the job stabilization nature of M5412 chip, thereby improve whole earth leakage protection circuit's job stabilization nature.
The connection control circuit 2 is connected between the ballast and the power supply circuit, is used for controlling the connection state of the ballast and the power supply circuit, is also connected with the electric leakage detection circuit 1, and outputs a power supply cut-off signal when receiving the electric leakage detection signal, and the power supply cut-off signal enables the ballast and the power supply circuit to be disconnected.
Because the voltage levels of the ballast working circuit and the power supply circuit are far larger than that of the leakage detection circuit 1, the connection control circuit 2 is set as a relay switch element, and the relay switch element can carry out electromagnetic isolation among the ballast working circuit, the power supply circuit and the leakage detection circuit 1 so as to reduce the possibility that the ballast working circuit and the power supply circuit cause electromagnetic interference to the leakage detection circuit 1.
In one example, the connection control circuit 2 is configured as a relay KM, the relay KM comprises a plurality of normally closed contacts, one end of a coil of the relay KM is connected with an anode of the thyristor Q1, the other end of the coil of the relay KM is connected with a positive electrode of a power supply, and the normally closed contacts of the relay KM are arranged between the ballast and the power supply circuit in series.
When the thyristor Q1 is turned on, the coil of the relay KM is energized, so that the normally closed contact of the relay KM is opened, and the ballast is disconnected from the power supply circuit, i.e. the ballast is deenergized.
Preferably, a second current limiting resistor R4 is connected between the coil of the relay KM and the anode of the thyristor Q1, and the second current limiting resistor R4 can be connected with the anode of the thyristor Q1
The detection control circuit 3 is used for controlling the connection state of the leakage detection circuit 1 with the power supply circuit. The detection control circuit 3 comprises a first signal access end, and the first signal access end controls the detection control circuit 3 to control the connection state of the electric leakage detection circuit 1 and the power supply circuit.
The detection control circuit 3 includes a first switch circuit 31 and a first switch element, the first signal access end is disposed on the first switch circuit 31 to control the first switch circuit 31 to output a switch trigger signal, the first switch element is connected to the power supply voltage terminal disposed on the positive electrode of the power supply and the electric leakage detection chip 11, the first switch circuit 31 can be controlled to output a switch trigger signal through the first signal access end to control the conduction of the first switch element, and then the power supply voltage terminal of the electric leakage detection chip 11 is controlled to be connected to the positive electrode of the power supply.
In one example, the first switch circuit 31 includes a first switch tube, a low voltage regulator tube Z1 and a first current limiting resistor R1 which are sequentially connected in series with the power supply, and a high voltage regulator tube Z2 which is connected in parallel with two ends of the series circuit of the first switch tube and the low voltage regulator tube Z1. Specifically, the first switch tube is an N-channel depletion type MOS tube Q2, the gate of the MOS tube Q2 is connected to the first signal access end, the source is connected to the negative electrode of the power supply, the drain is connected to the anode of the low voltage regulator tube Z1, the cathode of the low voltage regulator tube Z1 is connected to the positive electrode of the power supply through a first current-limiting resistor R1, the anode of the high voltage regulator tube Z2 is connected to the negative electrode of the power supply, and the cathode is connected to the end of the first current-limiting resistor R1 away from the positive electrode of the power.
When the voltage signal connected to the first signal connection end does not reach the conduction voltage of the MOS transistor Q2, the MOS transistor Q2 is not turned on, and the current in the first switch circuit 31 flows from the positive electrode of the power supply to the negative electrode of the power supply through the first current-limiting resistor R1 and the high voltage-stabilizing transistor Z2 in sequence, so that the first switch circuit 31 outputs a high-level switch trigger signal; when the voltage signal connected to the first signal access end reaches the conduction voltage of the MOS transistor Q1, the MOS transistor Q2 is turned on, a current is generated in the first switch circuit 31, the current sequentially flows from the positive electrode of the power supply through the first current-limiting resistor R1, the low voltage regulator tube Z1 and the MOS transistor Q2 to the negative electrode of the power supply, and the potential of the end part of the first current-limiting resistor R1 far away from the positive electrode of the power supply is pulled down to the regulated voltage of the low voltage regulator tube Z1, so that the first switch circuit 31 does not output a high-level switch trigger signal.
In an example, the first switching element is configured as an NPN-type transistor Q3, a base of the transistor Q3 is connected with an end of the first current-limiting resistor R1 far away from the positive electrode of the power supply, a collector is connected with the positive electrode of the power supply, and an emitter is connected with an 8 pin of the M5412 chip.
Preferably, the first switch circuit 31 in this example further includes a first voltage dividing unit 311, and the gate of the MOS transistor Q2 is connected to the first signal input terminal through the first voltage dividing unit 311. Specifically, the first voltage dividing unit 311 includes a first high voltage dividing resistor R2 and a first low voltage dividing resistor R3, one end of the first high voltage dividing resistor R2 is connected to the negative electrode of the power supply, the other end of the first high voltage dividing resistor R2 is connected to the first signal access end through the first low voltage dividing resistor R3, and the end of the first high voltage dividing resistor R2 close to the first low voltage dividing resistor R3 is connected to the gate of the MOS transistor Q2, so as to connect the first signal access end to the MOS transistor Q2. This kind of connection improves the operating stability of first switch circuit 31, has reduced the possibility of first switch circuit 31 fault damage.
In this example, the first switch circuit 31 further includes a second filter capacitor C2 and a third filter capacitor C3, wherein the second filter capacitor C2 is disposed in parallel at two ends of the first high voltage dividing resistor R2, and the third filter capacitor C3 is disposed in parallel at two ends of the high voltage regulator tube Z2. The second filter capacitor C2 and the third filter capacitor C3 can respectively improve the stability of the voltage connected to the gate of the MOS transistor Q2 and the voltage connected to the base of the transistor Q3, thereby improving the stability of the first switch circuit 31 and reducing the possibility of abnormal faults of the first switch circuit 31.
When the triode Q3 receives a switch trigger signal, the triode Q3 is conducted, so that the pin 8 of the M5412 chip is connected with the positive electrode of a power supply, and the M5412 chip can work after being electrified; when the transistor Q3 does not receive the switch trigger signal, the transistor Q3 is turned off, so that the pin 8 of the M5412 chip is disconnected from the positive pole of the power supply, and the M5412 chip cannot work when not powered on.
The above-mentioned process has realized the signal control detection control circuit 3 through the access of first signal incoming end to whether control electric leakage detection chip 11 can work, and then control electric leakage detection circuit 1 opens and close.
Further, the ballast leakage protection circuit further comprises an active cut-off circuit 4, the active cut-off circuit 4 is also used for controlling the connection control circuit 2 to control the connection of the ballast and the power supply circuit, the active cut-off circuit 4 and the leakage detection circuit 1 control the control process of the connection control circuit 2 to be parallel, namely, the connection control circuit 2 can act when receiving the control of either the active cut-off circuit 4 or the leakage detection circuit 1, and the connection of the ballast and the power supply circuit is cut off.
The active cut-off circuit 4 comprises a second signal access end, and the second signal access end is used for controlling the active cut-off circuit 4 to control the connection control circuit 2, so as to control the connection of the ballast and the power supply circuit.
The active cut-off circuit 4 is set as a second switch element, and the control end of the second switch element is connected with the second signal access end, so that the second switch element is switched on and off under the control of the signal accessed by the second signal access end; the second switch element is arranged at two ends of the first switch element in parallel to realize the parallel control of the relay switch element by the first switch element and the second switch element, namely, the relay switch element can work when any one of the first switch element and the second switch element is conducted, so that the ballast is disconnected by the power supply circuit.
In an example, the second switching element is set as an N-channel depletion type MOS transistor Q4, the gate of the MOS transistor Q4 is connected to the second signal access terminal, and the source and the drain are respectively connected to the negative electrode of the power supply and the anode of the thyristor Q1.
When the first signal access end is connected with a high-level signal, the MOS tube Q4 is conducted, so that the coil of the relay KM is electrified, the normally closed contact of the relay KM is disconnected, and the ballast is disconnected by the power supply circuit. Because the MOS tube Q4 is connected with the controllable silicon Q1 in parallel, the coil of the relay KM1 can be electrified when the MOS tube Q4 and the controllable silicon Q1 are switched on, so that the parallel control of the active cut-off circuit 4 and the electric leakage detection circuit 1 on the connection control circuit 2 is realized.
Preferably, the active cut-off circuit 4 in this example further includes a second voltage dividing unit 41, and the second signal input terminal is connected to the gate of the MOS transistor Q4 through the second voltage dividing unit 41. Specifically, the second voltage dividing unit 41 includes a second high voltage dividing resistor R5 and a second low voltage dividing resistor R6, one end of the second high voltage dividing resistor R5 is connected to the negative electrode of the power supply, the other end of the second high voltage dividing resistor R5 is connected to the second low voltage dividing resistor R6, the other end of the second low voltage dividing resistor R6 is connected to the second signal access end, the end of the second high voltage dividing resistor R5 close to the second low voltage dividing resistor R6 is connected to the gate of the MOS transistor Q4, so as to connect the second signal access end to the gate of the MOS transistor Q4. The second voltage division unit 41 can improve the stability of the grid voltage of the connected MOS transistor Q4 and reduce the possibility of fault abnormality of the MOS transistor Q4.
The implementation principle of the embodiment is as follows: the detection control circuit 3 can be controlled by controlling the input signal of the first signal access end, so that the on-off of the electric leakage detection circuit 1 is controlled; when the leakage detection circuit 1 is started, the leakage detection circuit 1 can detect whether the ballast leaks electricity and output a leakage detection signal when the ballast leaks electricity, the leakage detection signal controls the connection control circuit 2, and the connection control circuit 2 controls the ballast to be disconnected from the power supply circuit, so that the possibility that the ballast and a light source driven by the ballast cannot work normally due to the leakage of electricity is reduced, and the possibility of safety accidents caused by electric shock of personnel is reduced; the active cut-off circuit 4 and the electric leakage detection circuit 1 control the connection control circuit 2 in parallel to control the connection state of the ballast and the power supply circuit, so that the connection control of the ballast and the power supply circuit is more flexible, and the operation of fault maintenance, abnormal debugging and the like on the power failure of the ballast is facilitated.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. A ballast leakage protection circuit, comprising:
the leakage detection circuit (1) is connected with the ballast and is used for detecting whether the ballast leaks electricity or not so as to output a leakage detection signal when the ballast leaks electricity;
the connection control circuit (2) is connected between the ballast and the power supply circuit and is used for controlling the connection state of the ballast and the power supply circuit; the connection control circuit (2) is connected with the electric leakage detection circuit (1), receives the electric leakage detection signal, and outputs a power supply cut-off signal when receiving the electric leakage detection signal, wherein the power supply cut-off signal enables the ballast to be disconnected with the power supply circuit;
the detection control circuit (3) is used for controlling the electric leakage detection circuit (1) to be opened and closed and is connected with the electric leakage detection circuit (1) and comprises a first signal access end, wherein the first signal access end is used for controlling the detection control circuit (3) to control the electric leakage detection circuit (1) and the connection control circuit (2).
2. The ballast leakage protection circuit according to claim 1, wherein said leakage detection circuit (1) comprises:
the controllable switch element is connected and arranged between the connection control circuit (2) and the power supply circuit and used for controlling the connection state of the connection control circuit (2) and the power supply circuit, and when the controllable switch element is conducted, the leakage detection signal is output and enables the connection control circuit (2) to output a power supply cut-off signal;
and the detection end of the leakage detection chip (11) is connected with the ballast to detect whether the ballast leaks electricity, the output end of the leakage detection chip is connected with the controllable switch element, and a leakage state signal is output when the ballast leaks electricity and is used for switching on the controllable switch element.
3. The ballast leakage protection circuit according to claim 2, wherein said connection control circuit (2) comprises:
relay switch element, including coil and normally closed contact, the coil with controllable switch element series connection is in supply circuit, contact series connection set up in between ballast and the supply circuit, the power cut-off signal promptly the normally closed contact disconnection.
4. A ballast leakage protection circuit according to claim 3, wherein said connection control circuit (2) further comprises a second current limiting resistor arranged in series with said coil of said relay switching element and said controllable switching element.
5. The ballast leakage protection circuit according to claim 2, wherein the detection control circuit (3) comprises:
a first switching element connected between the leakage detection chip (11) and the power supply circuit;
a first switch circuit (31) for outputting a switch trigger signal, an output terminal of which is connected to the first switch element, the switch trigger signal turning on the first switch element; the first switch circuit (31) includes the first signal access terminal, which controls the first switch circuit (31).
6. The ballast leakage protection circuit according to claim 5, wherein the first switch circuit (31) comprises a first switch tube, a low voltage regulator tube and a first current limiting resistor which are sequentially arranged in series in the power supply, the first current limiting resistor is arranged close to the anode of the power supply, the first switch circuit (31) further comprises a high voltage regulator tube which is arranged in parallel at two ends of a circuit formed by connecting the low voltage regulator tube and the first current limiting resistor in series, the control end of the first switch tube is connected with the first signal access end, and the end part of the first current limiting resistor far away from the anode of the power supply is used for outputting the switch trigger signal.
7. The ballast leakage protection circuit of claim 6, wherein said first switching circuit (31) further comprises:
first divider unit (311), including first high divider resistance and the first low divider resistance that establishes ties and set up, the end connection power negative pole that first low divider resistance was kept away from to first high divider resistance, the end connection that first high divider resistance was kept away from to first low divider resistance first signal incoming end, first high divider resistance is close to the end connection of first divider resistance the control end of first switch tube.
8. The ballast leakage protection circuit of claim 2, further comprising:
and the active cut-off circuit (4) is arranged at two ends of the controllable switch element, is used for connecting two ends of the controllable switch element and comprises a second signal access end, and the second signal access end is used for controlling the active cut-off circuit (4) so as to control whether two ends of the controllable switch element are connected or not.
9. The ballast leakage protection circuit of claim 8, wherein the active cut-off circuit (4) comprises a second switching tube, the second switching tube is connected in parallel to two ends of the controllable switching element, and a control end of the second switching tube is connected to the second signal access end.
10. The ballast leakage protection circuit of claim 9, wherein said active shutdown circuit (4) further comprises:
second divider unit (41), including the second high divider resistance and the low divider resistance of second that the series connection set up, the end connection power negative pole that the second low divider resistance was kept away from to the high divider resistance of second, the end connection that the second high divider resistance was kept away from to the low divider resistance of second signal incoming end, the end connection that the second high divider resistance is close to the low divider resistance of second switch tube's control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021717395.4U CN212969039U (en) | 2020-08-17 | 2020-08-17 | Ballast leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021717395.4U CN212969039U (en) | 2020-08-17 | 2020-08-17 | Ballast leakage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212969039U true CN212969039U (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021717395.4U Expired - Fee Related CN212969039U (en) | 2020-08-17 | 2020-08-17 | Ballast leakage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212969039U (en) |
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2020
- 2020-08-17 CN CN202021717395.4U patent/CN212969039U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210413 |