CN203623152U - Thermal printer core heating protection circuit - Google Patents
Thermal printer core heating protection circuit Download PDFInfo
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- CN203623152U CN203623152U CN201320824920.6U CN201320824920U CN203623152U CN 203623152 U CN203623152 U CN 203623152U CN 201320824920 U CN201320824920 U CN 201320824920U CN 203623152 U CN203623152 U CN 203623152U
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- thermal printer
- temperature
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Abstract
The utility model provides a thermal printer core heating protection circuit comprising a temperature collection circuit, a voltage comparison circuit, a gate circuit, a heating driving circuit and a trigger delay circuit. An output end of the temperature collection circuit is connected with an input end of the voltage comparison circuit; an input end of the voltage comparison circuit is connected with one input end of the gate circuit; an output end of the trigger delay circuit is connected with the other input end of the gate circuit; and an output end of the gate circuit is connected with an input end of the heating driving circuit. The gate circuit is used for deenergizing the heating driving circuit under the conditions that the voltage comparison circuit outputs low level when the temperature collected by the temperature collection circuit is greater than the preset temperature or the output of the trigger delay circuit is the deenergizing output. The thermal printer core heating protection circuit can better protect a thermal printer core and prevent the temperature of the printer core from being too high.
Description
Technical field
The utility model relates to thermal printer movement protection field, refers in particular to thermal printer movement heating protection circuit.
Background technology
Using when thermal printer, need to carry out hardware protection to the heating head of printer core and motor, otherwise occurring that printer control program or circuit occur when abnormal, may causing printer core to damage.Existing scheme is to do hardware protection by the thermistor of printer core inside, or protects printer core by software control.
The general way of hardware protection is protected by printing thermal resistance; in the time that printer core temperature raises; thermistor resistance declines; corresponding comparator output level overturns to disconnect heating power supply power supply; reach the object of protection; the heating strobe pin of thermal printer is closed in software protection normally software timing, reaches the object of protection.But there is can cause when abnormal the inefficacy of protection at software in simple software protection, simple hardware protection can cause the inefficacy of protection in the time of circuit abnormal simultaneously.
Summary of the invention
The technical problems to be solved in the utility model, is to provide thermal printer movement heating protection circuit, solves the problem that existing thermal printer movement heating protection circuit easily lost efficacy.
The utility model is achieved in that
Thermal printer movement heating protection circuit, comprise temperature collection circuit, voltage comparator circuit, gate circuit, heat driven circuit and Time delay circuit, the output of described temperature collection circuit is connected with the input of voltage comparator circuit, one input of the input AND circuit of described voltage comparator circuit connects, another input of the output AND circuit of described Time delay circuit connects, and the output of described gate circuit is connected with the input of heat driven circuit;
Wherein, described gate circuit is for the heat driven circuit that deenergizes when the following situation: voltage comparator circuit is output as the temperature that temperature collection circuit collects and is greater than preset temperature, or Time delay circuit is output as the output of deenergizing.
Further, when the temperature that described voltage comparator circuit collects at temperature collection circuit is greater than preset temperature, output low level.
Further, described Time delay circuit is deenergizing when output, output low level.
Further, described heat driven circuit is in the time being deenergized, and the level that deenergizes is low level.
Further, when the temperature that described voltage comparator circuit collects at temperature collection circuit is greater than preset temperature, output low level; Described Time delay circuit is deenergizing when output, output low level.
Further, in described gate circuit, the negative terminal of diode D1 is connected with the output of voltage comparator circuit, the anode of diode D1 is connected with one end, the anode of diode D2 and the anode of diode D3 of resistance R 2, the other end of resistance R 2 is connected with positive source, the negative terminal of diode D2 is connected with the input of heat driven circuit, and the negative terminal of diode D3 is connected with the output of Time delay circuit.
Further, described Time delay circuit comprises monostable flipflop.
And the utility model also provides a kind of thermal printer, the movement holding circuit of this printer is the thermal printer movement heating protection circuit of above-mentioned any one.
The utility model has the advantage of: use two holding circuits to control the heating power supply of printer core simultaneously; still can reliably protecting printer core temperature be unlikely to too high and be burnt even if one of them holding circuit goes wrong, making the protection of printer core more reliable.
Accompanying drawing explanation
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is the circuit diagram of utility model preferred embodiment.
The specific embodiment
Refer to shown in Fig. 1; thermal printer movement heating protection circuit; comprise temperature collection circuit, voltage comparator circuit 1, gate circuit 2, heat driven circuit 3 and Time delay circuit 4; the output of temperature collection circuit is connected with the input of voltage comparator circuit 1; one input of the input AND circuit 2 of voltage comparator circuit 1 connects; output AND circuit 2 another inputs of Time delay circuit 4 connect, and the output of gate circuit 2 is connected with the input of heat driven circuit 3.
Wherein, gate circuit 2 is for the heat driven circuit 3 that deenergizes when the following situation: voltage comparator circuit 1 is output as the temperature that temperature collection circuit collects and is greater than preset temperature, or Time delay circuit 4 is output as the output of deenergizing.The input of Time delay circuit 4 is for being connected with heating control end, and Time delay circuit 4 is in the time of the level saltus step of heating control end, at the output level of one period of duration of output.Heat driven circuit 3 for add hot output terminal and be connected, add the heating unit that hot output terminal is connected in thermal printer movement, the input of heat driven unit 3 is the heating unit power supply to thermal printer movement at output output voltage in the time receiving enable signal.Voltage comparator circuit 1 is for voltage and the reference voltage of C.T Acquisition Circuit and export a high level or low level.
Preferably, when the temperature that voltage comparator circuit 1 collects at temperature collection circuit is greater than preset temperature, output low level.Temperature collection circuit can use a thermistor and fixed value resistance to carry out dividing potential drop to supply voltage, and along with the difference of temperature, the voltage on thermistor can be different, then compare with reference voltage again.As shown in Figure 1, can adopt a thermistor declining with temperature rise resistance, one end ground connection of thermistor, the normal phase input end of the voltage comparator U1A in one end and the voltage comparator circuit 1 of the other end and fixed value resistance is connected, and the other end of fixed value resistance is connected with positive source.In the time of excess Temperature, thermistor resistance declines, and the normal phase input end voltage of voltage comparator U1A is lower than the anti-phase input terminal voltage of voltage comparator U1A, thereby makes voltage comparator U1A be output as low level.
Further, Time delay circuit 4 is deenergizing when output, output low level.Heat control end in the time not heating movement, Time delay circuit 4 is output as low level.Time delay circuit can be realized with monostable flipflop, as shown in Figure 1, is monostable flipflop chip 74HC123D.In the time wanting to heat movement, the level of heating control end carries out saltus step from low to high, and Time delay circuit 4 is exported the high level of a period of time, and high level lasting time is determined by the size of C3, R10.And in the time not heating, the Level hold of heating control end is low, monostable flipflop is output as low level.
Heat driven circuit 3 is in the time having the thermal output of adding, and heat driven circuit 3 can be that high level drives or low level drives, and preferably, heat driven circuit 3 is being deenergized when (not output voltage), and the level that deenergizes (output level) is low level.Meanwhile, when the temperature collecting at temperature collection circuit when voltage comparator circuit 1 is greater than preset temperature, output low level; When Time delay circuit 4 is in the time deenergizing output, output low level.Gate circuit is an AND circuit in fact, meet in the time that the output of voltage comparator circuit 1 or Time delay circuit 4 has one to be low level (not heating movement), be that gate circuit is output as low level, make not output voltage of heat driven circuit 3, thereby reach the object that does not heat movement.
Gate circuit is can be by realizing with door chip with door, can adopt following gate circuit: in this gate circuit, the negative terminal of diode D1 is connected with the output of voltage comparator circuit 1, the anode of diode D1 is connected with one end, the anode of diode D2 and the anode of diode D3 of resistance R 2, the other end of resistance R 2 is connected with positive source, the negative terminal of diode D2 is connected with the input of heat driven circuit, and the negative terminal of diode D3 is connected with the output of Time delay circuit.
To sum up, when heating control end is not while wanting to heat movement or when movement excess Temperature, can not heat movement, greatly increase the security of movement.
Although more than described the specific embodiment of the present utility model; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present utility model; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present utility model, all should be encompassed in the scope that claim of the present utility model protects.
Claims (8)
1. thermal printer movement heating protection circuit, it is characterized in that: comprise temperature collection circuit, voltage comparator circuit, gate circuit, heat driven circuit and Time delay circuit, the output of described temperature collection circuit is connected with the input of voltage comparator circuit, one input of the input AND circuit of described voltage comparator circuit connects, another input of the output AND circuit of described Time delay circuit connects, and the output of described gate circuit is connected with the input of heat driven circuit;
Wherein, described gate circuit is for the heat driven circuit that deenergizes when the following situation: voltage comparator circuit is output as the temperature that temperature collection circuit collects and is greater than preset temperature, or Time delay circuit is output as the output of deenergizing.
2. thermal printer movement heating protection circuit as claimed in claim 1, is characterized in that: when the temperature that described voltage comparator circuit collects at temperature collection circuit is greater than preset temperature, and output low level.
3. thermal printer movement heating protection circuit as claimed in claim 1, is characterized in that: described Time delay circuit is deenergizing when output, output low level.
4. thermal printer movement heating protection circuit as claimed in claim 1, is characterized in that: described heat driven circuit is in the time being deenergized, and the level that deenergizes is low level.
5. thermal printer movement heating protection circuit as claimed in claim 4, is characterized in that: when the temperature that described voltage comparator circuit collects at temperature collection circuit is greater than preset temperature, and output low level; Described Time delay circuit is deenergizing when output, output low level.
6. thermal printer movement heating protection circuit as claimed in claim 5; it is characterized in that: in described gate circuit; the negative terminal of diode D1 is connected with the output of voltage comparator circuit; the anode of diode D1 is connected with one end, the anode of diode D2 and the anode of diode D3 of resistance R 2; the other end of resistance R 2 is connected with positive source; the negative terminal of diode D2 is connected with the input of heat driven circuit, and the negative terminal of diode D3 is connected with the output of Time delay circuit.
7. thermal printer movement heating protection circuit as claimed in claim 1, is characterized in that: described Time delay circuit comprises monostable flipflop.
8. a thermal printer, is characterized in that: comprise the thermal printer movement heating protection circuit as described in as arbitrary in claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824920.6U CN203623152U (en) | 2013-12-13 | 2013-12-13 | Thermal printer core heating protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320824920.6U CN203623152U (en) | 2013-12-13 | 2013-12-13 | Thermal printer core heating protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203623152U true CN203623152U (en) | 2014-06-04 |
Family
ID=50809666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320824920.6U Expired - Fee Related CN203623152U (en) | 2013-12-13 | 2013-12-13 | Thermal printer core heating protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203623152U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105249960A (en) * | 2015-09-28 | 2016-01-20 | 康泰医学系统（秦皇岛）股份有限公司 | Protection circuit and method for thermal printing of electrocardiograph |
| CN109819548A (en) * | 2018-12-26 | 2019-05-28 | 广州宝善电子科技有限公司 | A kind of PWM constant-current dimming circuit of 60-200V high-voltage LED lamp bead |
-
2013
- 2013-12-13 CN CN201320824920.6U patent/CN203623152U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105249960A (en) * | 2015-09-28 | 2016-01-20 | 康泰医学系统（秦皇岛）股份有限公司 | Protection circuit and method for thermal printing of electrocardiograph |
| CN105249960B (en) * | 2015-09-28 | 2017-12-08 | 康泰医学系统（秦皇岛）股份有限公司 | A kind of electrocardiograph thermal print protection circuit and method |
| CN109819548A (en) * | 2018-12-26 | 2019-05-28 | 广州宝善电子科技有限公司 | A kind of PWM constant-current dimming circuit of 60-200V high-voltage LED lamp bead |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20181213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |