CN211428902U - Circuit with banknote binding machine heating wire overheat protection - Google Patents
Circuit with banknote binding machine heating wire overheat protection Download PDFInfo
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- CN211428902U CN211428902U CN201921834003.XU CN201921834003U CN211428902U CN 211428902 U CN211428902 U CN 211428902U CN 201921834003 U CN201921834003 U CN 201921834003U CN 211428902 U CN211428902 U CN 211428902U
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Abstract
The utility model relates to a circuit with prick paper money machine heater strip overheat protection. The device comprises an input power supply, an input signal source, a signal shaping circuit, a charging and discharging circuit, a self-locking circuit, a power-off protection circuit, an alarm circuit and an anti-interference absorption circuit; the circuit and the control singlechip of the banknote binding machine jointly form a circuit with overheat protection of the heating wire of the banknote binding machine. The overheating protection circuit for the heating wire of the banknote binding machine can effectively prevent the phenomenon that the heating wire is continuously heated due to the fault or control error of the singlechip caused by the fault of the peripheral circuit of the singlechip, the fault of the singlechip and the fault of the silicon controlled rectifier; the circuit of mechanical power-off protection by the relay can thoroughly cut off the heating power supply of the heating wire, and prevent the danger caused by abnormal rise of the long-term electrifying temperature of the heating wire.
Description
Technical Field
The utility model relates to a control circuit, concretely relates to circuit with prick paper money machine heater strip overheat protection.
Background
The paper money bundling machine is one electromechanical integrated product for bundling paper money automatically and fast, and has microcomputer control technology to set paper money directly into the paper money bundling bin. The traditional banknote binding machine control circuit adopts silicon controlled rectifier to control the heating wire to heat, and a heating wire overheating protection circuit is not provided. As shown in fig. 1, when the machine is running, the HEAT end outputs a low level, the level of the HEAT end is controlled by the single chip microcomputer U2, when the photoelectric coupling U4 works, a trigger signal is given to the thyristor, the thyristor VT1 is triggered to be switched on to electrify the heating wire, so that the heating wire generates HEAT, and for continuous conduction heating, an alternating current power supply is adopted to supply power, wherein the alternating current power supply is generally 12V, and the alternating current power supply of 12V is converted by a 220V transformer. When the controlled silicon VT1 or the single chip microcomputer U2 has faults or the single chip microcomputer works incorrectly due to a circuit, the heating wires are burnt due to overhigh continuous electrifying temperature, or fire hazard is caused to a working area.
Disclosure of Invention
In order to overcome the deficiency of the background art, the utility model provides a circuit with prick paper money machine heater strip overheat protection.
The utility model discloses the technical scheme who adopts includes:
the input power supply is a 12V safe direct-current power supply obtained by reducing and stabilizing the voltage of a 24V power supply of the banknote binding machine;
the input signal source is the voltage of the port of the heating wire;
the input end of the signal shaping circuit is connected with an input signal source, the output end of the signal shaping circuit is connected with the charging and discharging circuit, and a signal is output after shaping to control the charging and discharging circuit to charge and discharge;
the charge and discharge circuit is connected to the input end of the self-locking circuit after comparing the output end signal of the charge and discharge circuit with a set time signal;
the output end of the self-locking circuit is connected with the input end of the power-off protection circuit and the alarm circuit;
the power-off protection circuit is connected with the heating wire power supply, and the heating wire power supply is directly cut off during power-off protection;
the alarm circuit is used for giving an audible and visual alarm prompt;
and the anti-interference absorption circuit can absorb floating voltage and signals caused by the circuit or external interference.
The signal shaping circuit comprises a rectifying tube VD2 and an isolation optocoupler U7; the isolating optocoupler U7 is EL2501 in model number.
The charging and discharging circuit comprises a triode Q13, a resistor R41, a resistor R42 and a capacitor C15; the triode Q13 is an NPN type triode.
The self-locking circuit comprises a comparator U1, a resistor R44, a resistor R45, a resistor R27, a resistor R28 and a diode D1; the comparator U1 is LM 358.
The power-off protection circuit comprises a resistor R32, a triode Q11, a relay K1 and a diode D3; the power supply of the heating wire is cut off by a relay K1 to achieve the protection effect.
The alarm circuit comprises a resistor R33, an LED lamp D4 and a diode D2; after protection, the alarm circuit can be triggered to carry out sound and light alarm, a buzzer is used for sound alarm, and an LED is used for light alarm.
The anti-interference absorption circuit comprises a capacitor C12, a capacitor C23 and a capacitor C16.
The overheating protection circuit for the heating wire of the banknote binding machine can effectively prevent the phenomena of continuous heating of the heating wire caused by faults of other peripheral circuits of the single chip microcomputer or control errors, faults of the single chip microcomputer and faults of the controlled silicon; and the circuit which is mechanically protected by the relay can thoroughly cut off the heating power supply of the heating wire, thereby preventing the danger caused by the fact that the long-term electrifying temperature of the heating wire rises beyond the specified range.
The utility model has the advantages that:
1. the power supply is obtained by reducing the voltage of the motor power supply without extra rectification;
2. the protection circuit is not influenced by the singlechip and the controlled silicon and works independently;
3. the self-locking alarm is adopted, the power supply of the heating wire is disconnected after the alarm is given out, the machine is restarted and recovered after the fault is eliminated, and the overheating of the heating wire is efficiently and stably prevented.
Drawings
Fig. 1 shows a conventional banknote binding machine circuit without overheating protection of heating wires.
Fig. 2 is a banknote binding machine circuit with heater wire overheat protection.
Fig. 3 is a circuit for overheat protection of the heating wire.
The specific implementation mode is as follows:
in order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine with the accompanying fig. 2 in the embodiment of the present invention to describe the technical solution in the embodiment of the present invention in more detail. As shown in fig. 2, the protection circuit device for preventing overheating of the heating wire of the banknote binding machine comprises an input power supply, an input signal source, a signal shaping circuit, a charging and discharging circuit, an anti-interference absorption circuit, a self-locking circuit, a power-off protection circuit and an alarm circuit; the input power supply is a 12V safe direct-current power supply obtained by reducing and stabilizing 24V voltage of a money binding machine power supply; the input signal source is a heating wire port J12; the signal shaping circuit comprises a rectifying tube VD2, an isolation optocoupler U7 and a comparator U1; the charging and discharging circuit comprises a triode Q13, a resistor R41, a resistor R42 and a capacitor C15; the anti-interference absorption circuit comprises a capacitor C12, a capacitor C23 and a capacitor C16; the self-locking circuit comprises a resistor R44, a resistor R45, a resistor R27, a resistor R28 and a diode D1; the power-off protection circuit comprises a resistor R32, a triode Q11, a relay K1 and a diode D3; the alarm circuit comprises a resistor R33, an LED lamp D4 and a diode D2. As shown in fig. 3, the voltage at the two ends of the heating wire is used as a signal source and is sent to the charging and discharging circuit through the signal shaping circuit; the charging and discharging circuit signals are compared with the set signals, if the charging and discharging circuit signals are higher than the set signals, the power-off protection circuit and the self-locking circuit are triggered, when the self-locking circuit and the power-off protection circuit are triggered, the power-off protection circuit automatically cuts off the heating wire power supply and triggers the alarm circuit, the self-locking circuit can keep continuous alarming and continuous cutting off of the heating wire power supply, and the paper money binding machine is restarted and then recovered; if the charging and discharging circuit signal is lower than the set signal, the power-off protection circuit and the self-locking circuit cannot be triggered.
The utility model discloses a theory of operation does:
when the banknote binding machine does not heat the heating wire, no alternating voltage is input at the two ends of the heating wire, the disconnection of the isolation optocoupler U7 is controlled, the triode Q13 is switched on, and the C15 is grounded through the Q13 to discharge rapidly. When the voltage at two ends of the C15 is lower than the voltage division setting reference of the resistors R31 and R43, the output pin 7 of the U1B is at high level. A pin 1 of the U1A outputs high level, the triode Q11 is cut off, and the relay does not work and does not protect the heating wire. When the banknote binding machine heats the heating wire through the silicon controlled rectifier, alternating voltage is input at two ends of the heating wire, the alternating voltage is rectified through the rectifying tube VD2 and filtered through the capacitor C12 and then is supplied to the U7, the isolation optocoupler is controlled to be switched on, the triode Q13 is cut off, and the capacitor C15 is slowly charged through the resistor. When the power is continuously supplied to the heating wire, if the voltage across the C15 is higher than the voltage division setting reference of the resistors R31 and R43, the output pin 7 of the U1B is at a low level. The diode D1 is conducted, the pin 1 of the U1A outputs low level, the triode Q11 is conducted, and the relay works to cut off the power supply of the heating wire to protect the heating wire; when the 1 pin of U1A outputs low level, the 3 pin level is lower than the 2 pin level; even after the power supply of the heating wire is cut off, the output pin of the U1B is recovered to be normal, the level of the 3 pin of the U1A which is conducted in one direction by the diode D1 cannot be changed, the circuit protection enters a self-locking state, and the alarm protection is continued. Diode D2 connects the buzzer, and the protection of circuit can trigger the buzzer and make a sound always and pilot lamp LED will be bright always.
Through the setting, the utility model discloses a hardware circuit reaches the heater strip guard action through electric capacity charge-discharge, and is irrelevant with other hardware such as singlechip, silicon controlled rectifier, high-efficient, stable protection heater strip.
Claims (7)
1. A circuit with banknote binding machine heating wire overheat protection is characterized by comprising:
the input power supply is a 12V safe direct-current power supply obtained by reducing and stabilizing the voltage of a 24V power supply of the banknote binding machine;
the input signal source is the voltage of the port of the heating wire;
the input end of the signal shaping circuit is connected with an input signal source, the output end of the signal shaping circuit is connected with the charging and discharging circuit, and a signal is output after shaping to control the charging and discharging circuit to charge and discharge;
the charge and discharge circuit is connected to the input end of the self-locking circuit after comparing the output end signal of the charge and discharge circuit with a set time signal;
the output end of the self-locking circuit is connected with the input end of the power-off protection circuit and the alarm circuit;
the power-off protection circuit is connected with the heating wire power supply, and the heating wire power supply is directly cut off during power-off protection;
the alarm circuit is used for giving an audible and visual alarm prompt;
and the anti-interference absorption circuit can absorb floating voltage and signals caused by the circuit or external interference.
2. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the signal shaping circuit comprises a rectifying tube VD2 and an isolation optocoupler U7; the isolating optocoupler U7 is EL2501 in model number.
3. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the charging and discharging circuit comprises a triode Q13, a resistor R41, a resistor R42 and a capacitor C15; the triode Q13 is an NPN type triode.
4. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the self-locking circuit comprises a comparator U1, a resistor R44, a resistor R45, a resistor R27, a resistor R28 and a diode D1; the comparator U1 is LM 358.
5. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the power-off protection circuit comprises a resistor R32, a triode Q11, a relay K1 and a diode D3; the power supply of the heating wire is cut off by a relay K1 to achieve the protection effect.
6. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the alarm circuit comprises a resistor R33, an LED lamp D4 and a diode D2; after protection, the alarm circuit can be triggered to carry out sound and light alarm, a buzzer is used for sound alarm, and an LED is used for light alarm.
7. The circuit with banknote binding machine heating wire overheat protection according to claim 1, characterized in that: the anti-interference absorption circuit comprises a capacitor C12, a capacitor C23 and a capacitor C16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921834003.XU CN211428902U (en) | 2019-10-29 | 2019-10-29 | Circuit with banknote binding machine heating wire overheat protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921834003.XU CN211428902U (en) | 2019-10-29 | 2019-10-29 | Circuit with banknote binding machine heating wire overheat protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211428902U true CN211428902U (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921834003.XU Active CN211428902U (en) | 2019-10-29 | 2019-10-29 | Circuit with banknote binding machine heating wire overheat protection |
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| CN (1) | CN211428902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436549A (en) * | 2022-09-16 | 2022-12-06 | 华电智控（北京）技术有限公司 | Protection device and method for temperature control of chromatograph |
-
2019
- 2019-10-29 CN CN201921834003.XU patent/CN211428902U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436549A (en) * | 2022-09-16 | 2022-12-06 | 华电智控（北京）技术有限公司 | Protection device and method for temperature control of chromatograph |
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