CN216390491U - Protection circuit of equal thickness screen equipment - Google Patents
Protection circuit of equal thickness screen equipment Download PDFInfo
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- CN216390491U CN216390491U CN202122529188.7U CN202122529188U CN216390491U CN 216390491 U CN216390491 U CN 216390491U CN 202122529188 U CN202122529188 U CN 202122529188U CN 216390491 U CN216390491 U CN 216390491U
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Abstract
The utility model belongs to the technical field of motor protection equipment's technique and specifically relates to a protection circuit of equal thickness sieve equipment is related to, equal thickness sieve equipment includes: a power supply circuit of a first motor M1 and a second motor M2 connected in parallel with each other, and the first motor M1 and the second motor M2, the protection circuit comprising: first voltage detection circuit, second voltage detection circuit, first comparison circuit, second comparison circuit, integrated circuit and control circuit, this application has the overload condition of every motor of accurate reaction, all plays the guard action to two motors, reduces the condemned effect of possibility of motor damage.
Description
Technical Field
The application relates to the technical field of motor protection equipment, in particular to a protection circuit of equal-thickness screen equipment.
Background
The constant-thickness screen is used for dry and wet screening of coal or minerals with similar density, and operations such as coal dehydration, medium removal, desliming and the like.
A constant thickness screen typically includes two motors connected in parallel in the same circuit. During operation of the isopipe, the actual operating current of each motor is typically around 60% of its rated current, for example, a motor rated at 24A, the actual operating current is 14A, and the sum of the currents on the main circuit is 28A. If the coal is wet or the coal inside the equal-thickness screen is blocked, the load of the equal-thickness screen motor is increased, and the actual running current of the motor is increased.
Fig. 1 is a schematic diagram of an overload protection circuit for a uniform-thickness screen in the related art, as shown in fig. 1, in the related art, a thermal relay is connected in series with a main circuit to perform overload protection on two motors of the uniform-thickness screen, and when the sum of actual operating currents of the two motors exceeds a set value (for example, 48A), the thermal relay operates to control the main circuit to be disconnected, so that overload protection of the two motors is realized. However, since the loads of the two motors of the equal-thickness screen can be different, when one of the motors is low in load (the actual running current is low), the load of the other motor reaches a peak value, and the total current in the main loop may not exceed the set value; at this time, the thermal relay cannot act, so that the other motor is burnt. If the set value is set to be small, the malfunction of the thermal relay may increase.
In summary, the overload protection of the two motors by using one thermal relay in the equal-thickness screen loop in the related art cannot effectively and accurately protect the two motors.
SUMMERY OF THE UTILITY MODEL
In order to accurately reflect the overload condition of each motor, the two motors are protected, and the possibility of motor damage and scrapping is reduced, the protection circuit of the equal-thickness screen equipment adopts the following technical scheme:
a protection circuit of a isopipe apparatus, the isopipe apparatus comprising: a power supply circuit of a first motor M1 and a second motor M2 connected in parallel with each other, and the first motor M1 and the second motor M2, the protection circuit comprising: a first voltage detection circuit, a second voltage detection circuit, a first comparison circuit, a second comparison circuit, an integration circuit and a control circuit,
the input end of the first voltage detection circuit is connected with the stator lead end of the first motor M1, and the output end of the first voltage detection circuit is connected with the input end of the first comparison circuit;
the input end of the second voltage detection circuit is connected with the stator lead end of the second motor M2, and the output end of the second voltage detection circuit is connected with the input end of the second comparison circuit;
the output end of the first comparison circuit is connected with the first input end of the integrated circuit, and the output end of the second comparison circuit is connected with the second input end of the integrated circuit;
the output end of the integrated circuit is connected with the control circuit, and the integrated circuit is used for generating a turn-off signal under the condition that the output signal of at least one of the first comparison circuit and the second comparison circuit represents that the motor of the equal-thickness screen equipment is overloaded;
and the control circuit is used for controlling the power supply loop to be disconnected according to the turn-off signal.
By adopting the technical scheme, the first voltage detection circuit detects the voltage of the first motor M1, the second voltage detection circuit detects the voltage of the second motor M2, the two circuits are used for respectively detecting the two motors, so that the detection signals are more accurate, the first detection signal and the second detection signal are output, the first comparison circuit compares the first detection signal with the preset value signal, the second comparison circuit compares the second detection signal with the preset value signal and respectively outputs the first comparison signal and the second comparison signal, the integration circuit integrates the first comparison signal and the second comparison signal, the integration circuit receives the comparison signals and outputs the integration signals, and finally the control circuit controls the on-off of the power supply loops of the first motor M1 and the second motor M2 according to the integration signals; when any one of the first motor M1 and the second motor M2 is overloaded, the current of the motor is increased and the voltage is reduced, when the voltage is lower than a preset value, the control circuit switches off the power supply loops of the first motor M1 and the second motor M2, and the two motors stop working; therefore, the overload condition of each motor is accurately reflected, the two motors are protected, and the possibility of damage and scrapping of the motors is reduced.
Preferably, the first comparing circuit includes a first comparator U1, an inverting input terminal of the first comparator U1 is connected to the first voltage detecting circuit for receiving the first detection signal, a non-inverting input terminal of the first comparator U1 receives the first preset value signal, and an output terminal of the first comparator U1 is connected to the integrating circuit for outputting the first comparison signal.
By adopting the above technical scheme, the first comparator U1 compares the first detection signal with the first preset value signal, when the first detection signal is greater than the first preset value signal, the first comparison signal output by the first comparator U1 is at a low level, and when the first detection signal is less than the first preset value signal, the first comparison signal output by the first comparator U1 is at a high level.
Preferably, the second comparator circuit includes a second comparator U2, an inverting input terminal of the second comparator U2 is connected to the second voltage detection circuit for receiving the second detection signal, a non-inverting input terminal of the second comparator U2 receives the second preset value signal, and an output terminal of the second comparator U2 is connected to the integration circuit for outputting the second comparison signal.
By adopting the above technical scheme, the second comparator U2 compares the second detection signal with the second preset value signal, when the second detection signal is greater than the second preset value signal, the second comparison signal output by the second comparator U2 is at a low level, and when the second detection signal is less than the second preset value signal, the second comparison signal output by the second comparator U2 is at a high level.
Preferably, the integration circuit includes a two-input OR gate OR2, one input terminal of the two-input OR gate OR2 is connected to the output terminal of the first comparator U1 to receive the first comparison signal, the other input terminal of the two-input OR gate OR2 is connected to the output terminal of the second comparator U2 to receive the second comparison signal, and the output terminal is connected to the control circuit to output the corresponding integration signal.
By adopting the technical scheme, when the first comparison signal and the second comparison signal are both at a low level, the integrated signal output by the integrated circuit is at a low level; when the first comparison signal and the second comparison signal are both at a high level, the integrated signal output by the integrated circuit is at a high level; when any one of the first comparison signal and the second comparison signal is at a low level and the other one is at a high level, the integration signal output by the integration circuit is at a high level.
Preferably, the control circuit comprises a switch circuit and an execution circuit, and the switch circuit is connected to the integration circuit to receive the integration signal and output a corresponding switch signal; the execution circuit is connected with the switch circuit to be controlled by the switch circuit, and is used for controlling the on-off of the power supply loops of the first motor M1 and the second motor M2.
By adopting the technical scheme, the switch circuit receives the integrated signal, outputs a corresponding switch signal according to the integrated signal, and the execution circuit receives the switch signal and performs a corresponding execution action according to the switch signal so as to perform on-off control on the power supply loops of the first motor M1 and the second motor M2.
Preferably, the switching circuit includes a transistor Q1, a base of a transistor Q1 is connected to the output terminal of the two-input OR gate OR2 to receive the integration signal, a collector of a transistor Q1 is connected to the execution circuit 42 to output the switching signal, and an emitter of a transistor Q1 is grounded.
By adopting the technical scheme, when the two-input OR gate OR2 outputs high level, the current at the base of the triode Q1 is increased, so that the current at the collector of the triode Q1 is increased, and after the current at the collector is increased to a certain degree, the triode Q1 is in saturated conduction.
Preferably, the execution circuit 42 comprises a relay KM1, one end of a coil of the relay KM1 is connected to a collector of the transistor Q1, the other end of the coil is grounded, and a normally closed contact KM1-1 of the relay KM1 is connected to a power supply loop of the first motor M1 and the second motor M2.
By adopting the technical scheme, when the triode Q1 is not saturated, the normally closed contact KM1-1 of the relay KM1 is closed, and the first click M1 and the second motor M2 operate normally; when the transistor Q1 is in saturated conduction, the normally closed contact KM1-1 of the relay KM1 is opened. The first motor M1 and the second motor M2 both stop operating.
Preferably, the device also comprises a first indicating circuit and a second indicating circuit,
the first indicating circuit is connected to the output end of the first comparator U1 to receive the first comparison signal and make a corresponding indicating action according to the first comparison signal;
the second indicating circuit is connected to the output end of the second comparator U2 to receive the second comparison signal and make a corresponding indicating action according to the second comparison signal.
By adopting the technical scheme, when the first comparison signal output by the first comparator U1 is at a high level, the first indicating circuit makes a corresponding indicating action, so that a worker visually detects the working state of the first motor M1; when a second comparison signal output by the second comparator U2 is at a high level, the second indicating circuit performs a corresponding indicating action, so that a worker intuitively detects the working state of the second motor M2; meanwhile, when one of the first motor M1 or the second motor M2 is damaged, the two motors stop working, and then a worker observes the first indicating circuit and the second indicating circuit to find out which motor is overloaded.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when any one of the first motor M1 and the second motor M2 is about to be overloaded, the current of the motor is increased and the voltage is reduced, when the voltage is lower than a preset value, the control circuit turns off the power supply loops of the first motor M1 and the second motor M2, and the two motors stop working; the overload condition of each motor is accurately reflected, the two motors are protected, and the possibility of damage and scrapping of the motors is reduced;
2. the first comparison circuit compares the first detection signal with a preset value signal, and the second comparison circuit compares the second detection signal with the preset value signal and respectively outputs a first comparison signal and a second comparison signal, so that the integration circuit integrates the first comparison signal and the second comparison signal;
3. when the first comparison signal and the second comparison signal are both at a low level, the integrated signal output by the integrated circuit is at a low level; when the first comparison signal and the second comparison signal are both at a high level, the integrated signal output by the integrated circuit is at a high level; when any one of the first comparison signal and the second comparison signal is at a low level and the other one is at a high level, the integration signal output by the integration circuit is at a high level.
Drawings
Fig. 1 is an overall circuit schematic diagram of an embodiment of the present application.
Description of reference numerals: 11. a first voltage detection circuit; 12. a second voltage detection circuit; 21. a first comparison circuit; 22. a second comparison circuit; 3. an integration circuit; 4. a control circuit; 41. a switching circuit; 42. an execution circuit; 5. a first indication circuit; 6. a second indicating circuit.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses protection circuit of equal thickness sieve equipment.
As shown in fig. 1, a protection circuit of a uniform thickness screen device includes a first voltage detection circuit 11, a second voltage detection circuit, a first comparison circuit 21, a second comparison circuit 22, an integration circuit 3, and a control circuit 4. The equal-thickness screen equipment comprises a first motor M1 and a second motor M2, wherein the first motor M1 and the second motor M2 are connected in parallel with each other and are connected in a power supply loop. The integration circuit 3 is connected to the comparison circuit 2 for receiving the comparison signal and outputting a corresponding integration signal according to the comparison signal. The control circuit 4 is connected to the integration circuit 3 to receive the integration signal and perform on-off control on the power supply loops of the first motor M1 and the second motor M2 according to the integration signal.
When any one of the first motor M1 and the second motor M2 is about to be overloaded, the current of the motor is increased and the voltage is reduced, when the voltage is lower than a preset value, the control circuit 4 turns off the power supply loops of the first motor M1 and the second motor M2, and the two motors stop working; the overload condition of each motor is accurately reflected, the two motors are protected, and the possibility of damage and scrapping of the motors is reduced.
As shown in fig. 1, the first voltage detection circuit 11 is configured to detect a terminal voltage of the first motor M1 and output a corresponding first detection signal; the second voltage detection circuit 12 is configured to detect a terminal voltage of the second motor M2 and output a corresponding second detection signal. The detection signal includes a first detection signal and a second detection signal.
The input end of the first voltage detection circuit 11 is connected with the stator lead end of the first motor M1, and the output end is connected with the input end of the first comparison circuit 21;
second voltage detection circuit 12
Is connected to the stator lead terminal of the second motor M2 and the output terminal is connected to the input terminal of the second comparator circuit 22.
In the present embodiment, the first voltage detection circuit 11 is a first voltage sampler, and the second voltage detection circuit 12 is a second voltage sampler.
As shown in fig. 1, the first comparing circuit 21 is connected to the first voltage detecting circuit 11 to receive the first detection signal, compare the first detection signal with the preset value signal, and output a corresponding first comparing signal; the second comparing circuit 22 is connected to the second voltage detecting circuit 12 for receiving the second detection signal, comparing the second detection signal with the preset value signal, and outputting a corresponding second comparison signal.
The first comparison circuit 21 includes a first comparator U1, a first nonpolar resistor R1, and a second nonpolar resistor R2. The first nonpolar resistor R1 is connected in series with the second nonpolar resistor R2. One end of the first nonpolar resistor R1 is connected to VCC, the other end is connected to the second nonpolar resistor R2, and one end of the second nonpolar resistor R2 is grounded. The node of the first and second non-polar resistors R1 and R2 is connected to the non-inverting input of the first resistor U1. The inverting input terminal of the first comparator U1 is connected to the first voltage detecting circuit 11 for receiving the detection signal, and the output terminal of the first comparator U1 is connected to the integrating circuit 3 for outputting the first comparison signal.
When the first detection signal is greater than the first preset value signal, the first comparison signal output by the first comparator U1 is at a low level, and when the first detection signal is less than the first preset value signal, the first comparison signal output by the first comparator U1 is at a high level.
The second comparison circuit 22 includes a second comparator U2, a third nonpolar resistor R3, and a fourth nonpolar resistor R4. The third nonpolar resistor R3 is connected in series with the fourth nonpolar resistor R4. One end of the third nonpolar resistor R3 is connected to VCC, the other end is connected to the fourth nonpolar resistor R4, and one end of the fourth nonpolar resistor R4 is grounded. The node of the third and fourth non-polar resistors R3 and R4 is connected to the non-inverting input of the second resistor U2. The inverting input terminal of the second comparator U2 is connected to the second voltage detecting circuit 12 for receiving the detecting signal, and the output terminal of the second comparator U2 is connected to the integrating circuit 3 for outputting the second comparing signal.
When the second detection signal is greater than the second preset value signal, the second comparison signal output by the second comparator U2 is at a low level, and when the second detection signal is less than the second preset value signal, the second comparison signal output by the second comparator U2 is at a high level.
As shown in fig. 1, the integrated circuit 3 includes a two-input OR gate OR 2. One input terminal of the two-input OR gate OR2 is connected to the output terminal of the first comparator U1 for receiving the first comparison signal, the other input terminal of the two-input OR gate OR2 is connected to the output terminal of the second comparator U2 for receiving the second comparison signal, and the output terminal is connected to the control circuit 4 for outputting the corresponding integration signal.
When the first comparison signal and the second comparison signal are both at a low level, the integrated signal output by the integrated circuit 3 is at a low level; when the first comparison signal and the second comparison signal are both at a high level, the integration signal output by the integration circuit 3 is at a high level; when either one of the first comparison signal and the second comparison signal is at a low level and the other one is at a high level, the integration signal output by the integration circuit 3 is at a high level.
As shown in fig. 1, the control circuit 4 includes a switching circuit 41 and an execution circuit 42. The switch circuit 41 is connected to the integration circuit 3 to receive the integration signal and output a corresponding switch signal; the execution circuit 42 is connected to the switching circuit 41 to receive the switching signal, and performs on-off control on the power supply loops of the first motor M1 and the second motor M2 according to the switching signal.
As shown in fig. 1, the switching circuit 41 includes a transistor Q1, a base of a transistor Q1 is connected to the output terminal of the two-input OR gate OR2 for receiving the integration signal, a collector of a transistor Q1 is connected to the execution circuit 42 for outputting the switching signal, and an emitter of a transistor Q1 is grounded.
When the two-input OR gate OR2 outputs a high level, the current at the base of transistor Q1 increases, causing an increase in current at the collector of transistor Q1, and when the collector current increases to a certain extent, transistor Q1 is saturated and turned on.
As shown in fig. 1, the execution circuit 42 includes a relay KM1, wherein one end of the coil of the relay KM1 is connected to the collector of the transistor Q1, and the other end is grounded. The normally closed contact KM1-1 of the relay KM1 is connected to the power supply circuit of the first motor M1 and the second motor M2.
When the triode Q1 is not saturated, the normally closed contact KM1-1 of the relay KM1 is closed, and the first click M1 and the second motor M2 operate normally; when the transistor Q1 is in saturated conduction, the normally closed contact KM1-1 of the relay KM1 is opened. The first motor M1 and the second motor M2 both stop operating.
As shown in fig. 1, a first indicator circuit 5 and a second indicator circuit 6 are also included.
The first indicating circuit 5 includes a first light emitting diode LED1, an anode of the first light emitting diode LED1 is connected to the output terminal of the first comparator U1, and a cathode of the first light emitting diode LED1 is grounded. In this embodiment, a first current limiting resistor R5 is connected between the first light emitting diode LED1 and the first comparator U1, and is used for limiting the magnitude of the current flowing to the first light emitting diode LED 1.
The second indicating circuit 6 includes a second light emitting diode LED2, an anode of the second light emitting diode LED2 is connected to the output terminal of the second comparator U2, and a cathode of the second light emitting diode LED2 is grounded. In this embodiment, a second current limiting resistor R6 is connected between the second LED2 and the second comparator U2 for limiting the current flowing to the second LED 2.
The implementation principle is as follows:
the overload protection of the first motor M1 and the second motor M2 is based on the characteristics of current increase and voltage decrease when the motors are overloaded,
the first state: when the two motors work normally, the first comparison signal is at a low level, the second comparison signal is at a low level, the integrated signal output by the two-input OR gate OR2 is at a low level, the diode Q1 is not saturated and is not conducted, the normally closed contact KM1-1 of the relay KM1 is closed, the power supply loops of the first motor M1 and the second motor M2 are conducted, the first motor M1 and the second motor M2 work, and the first light-emitting diode LED1 and the second light-emitting diode LED2 are both in an off state;
and a second state: when the first motor M1 is about to overload, the voltage is reduced, when the voltage is reduced to a certain degree, the first detection signal is smaller than the first preset value signal, the first comparison signal is at a high level, the second comparison signal is at a low level, the integrated signal output by the two-input OR gate OR2 is at a high level, the diode Q1 is in saturated conduction, the normally closed contact KM1-1 of the relay KM1 is disconnected, the power supply loops of the first motor M1 and the second motor M2 are disconnected, the first motor M1 and the second motor M2 both stop working, the first light emitting diode LED1 is turned on when receiving the high level, and the second light emitting diode LED2 is still in an off state;
and a third state: when the second motor M2 is about to overload, the voltage is reduced, when the voltage is reduced to a certain degree, the second detection signal is smaller than the second preset value signal, the second comparison signal is at a high level, the first comparison signal is at a low level, the integrated signal output by the two-input OR gate OR2 is at a high level, the diode Q1 is in saturated conduction, the normally closed contact KM1-1 of the relay KM1 is disconnected, the power supply loops of the first motor M1 and the second motor M2 are disconnected, the first motor M1 and the second motor M2 both stop working, the second light emitting diode LED2 receives the high level and is turned on, and the first light emitting diode LED1 is still in an off state;
and a fourth state: when the first motor M1 and the second motor M2 are about to be overloaded, the voltages of the two motors are both reduced, after the voltages are reduced to a certain degree, the first detection signal is smaller than the first preset value signal, the second detection signal is smaller than the second preset value signal, the first comparison signal is at a high level, the second comparison signal is at a high level, the integrated signal output by the two-input OR gate OR2 is at a high level, the diode Q1 is in a saturated conduction state, the normally closed contact KM1-1 of the relay KM1 is disconnected, the power supply loops of the first motor M1 and the second motor M2 are disconnected, the first motor M1 and the second motor M2 stop working, the first light emitting diode LED1 receives the high level to light up, and the second light emitting diode LED2 also receives the high level to light up.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A protection circuit of a isopipe apparatus, the isopipe apparatus comprising: a power supply circuit of a first motor M1 and a second motor M2 connected in parallel with each other, and of the first motor M1 and the second motor M2, characterized in that the protection circuit comprises: a first voltage detection circuit (11), a second voltage detection circuit (12), a first comparison circuit (21), a second comparison circuit (22), an integration circuit (3) and a control circuit (4),
the input end of the first voltage detection circuit (11) is connected with the stator lead end of the first motor M1, and the output end of the first voltage detection circuit is connected with the input end of the first comparison circuit (21);
the input end of the second voltage detection circuit (12) is connected with the stator lead end of the second motor M2, and the output end of the second voltage detection circuit is connected with the input end of the second comparison circuit (22);
the output of the first comparator circuit (21) is connected to a first input of the integration circuit (3), and the output of the second comparator circuit (22) is connected to a second input of the integration circuit (3);
the output end of the integrated circuit (3) is connected with the control circuit (4), and the integrated circuit (3) is used for generating a turn-off signal when the output signal of at least one of the first comparison circuit (21) and the second comparison circuit (22) represents the motor overload of the equal-thickness screen equipment;
and the control circuit (4) is used for controlling the power supply loop to be disconnected according to the turn-off signal.
2. The protection circuit of a constant-thickness screen apparatus according to claim 1, wherein: the first comparing circuit (21) comprises a first comparator U1, an inverting input terminal of the first comparator U1 is connected to the first voltage detecting circuit (11) to receive the first detection signal, a non-inverting input terminal of the first comparator U1 receives the first preset value signal, and an output terminal of the first comparator U1 is connected to the integrating circuit (3) to output the first comparison signal.
3. The protection circuit of a constant-thickness screen apparatus according to claim 1, wherein: the second comparator circuit (22) comprises a second comparator U2, an inverting input terminal of the second comparator U2 is connected to the second voltage detection circuit (12) for receiving the second detection signal, a non-inverting input terminal of the second comparator U2 receives the second preset value signal, and an output terminal of the second comparator U2 is connected to the integration circuit (3) for outputting the second comparison signal.
4. The protection circuit of a constant-thickness screen apparatus according to claim 1, wherein: the integration circuit (3) comprises a two-input OR gate OR2, one input of the two-input OR gate OR2 is connected to the output of the first comparator U1 for receiving the first comparison signal, the other input of the two-input OR gate OR2 is connected to the output of the second comparator U2 for receiving the second comparison signal, and the output is connected to the control circuit (4) for outputting the corresponding integration signal.
5. The protection circuit of a constant-thickness screen apparatus according to claim 1, wherein: the control circuit comprises a switch circuit and an execution circuit, wherein the switch circuit is connected to the integration circuit to receive the integration signal and output a corresponding switch signal; the execution circuit is connected with the switch circuit to be controlled by the switch circuit, and is used for controlling the on-off of the power supply loops of the first motor M1 and the second motor M2.
6. The protection circuit of a constant-thickness screen apparatus according to claim 5, wherein: the switching circuit comprises a transistor Q1, the base of a transistor Q1 is connected to the output end of a two-input OR gate OR2 to receive the integrated signal, the collector of a transistor Q1 is connected to the execution circuit 42 to output the switching signal, and the emitter of a transistor Q1 is grounded.
7. The protection circuit of a constant-thickness screen apparatus according to claim 5, wherein: the executive circuit 42 comprises a relay KM1, one end of a coil of the relay KM1 is connected to a collector of the triode Q1, the other end of the coil is grounded, and a normally closed contact KM1-1 of the relay KM1 is connected to a power supply loop of the first motor M1 and the second motor M2.
8. The protection circuit of a constant-thickness screen apparatus according to claim 1, wherein: also comprises a first indicating circuit and a second indicating circuit,
the first indicating circuit is connected to the output end of the first comparator U1 to receive the first comparison signal and make a corresponding indicating action according to the first comparison signal;
the second indicating circuit is connected to the output end of the second comparator U2 to receive the second comparison signal and make a corresponding indicating action according to the second comparison signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122529188.7U CN216390491U (en) | 2021-10-20 | 2021-10-20 | Protection circuit of equal thickness screen equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122529188.7U CN216390491U (en) | 2021-10-20 | 2021-10-20 | Protection circuit of equal thickness screen equipment |
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| Publication Number | Publication Date |
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| CN216390491U true CN216390491U (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122529188.7U Active CN216390491U (en) | 2021-10-20 | 2021-10-20 | Protection circuit of equal thickness screen equipment |
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