CN105249960B - A kind of electrocardiograph thermal print protection circuit and method - Google Patents
A kind of electrocardiograph thermal print protection circuit and method Download PDFInfo
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- CN105249960B CN105249960B CN201510624124.1A CN201510624124A CN105249960B CN 105249960 B CN105249960 B CN 105249960B CN 201510624124 A CN201510624124 A CN 201510624124A CN 105249960 B CN105249960 B CN 105249960B
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Abstract
The invention discloses a kind of electrocardiograph thermal print protection circuit and method; including thermal printing heating plate, microprocessor control unit; analog signal output connection one drive amplification circuit of control of microprocessor control unit; one MOS power tube of drive amplification circuit drives, the amplification section of MOS power tubes to heating plate provide dc source; a current sampling resistor is provided with the thermal printing heating plate power ground side, the current signal of taking-up is connected to the second analog-to-digital conversion input of microprocessor control unit.Avoid complete machine from causing because print job electric current is excessive system power supply abnormal present invention employs a variety of methods and circuit while be also possible to prevent to flow through that heating plate electric current is excessive, and heating plate temperature is too high, burns heating plate.Pass through the setting of hardware circuit and software regulation and control and management so that the overtemperature protection of thermal printer is relatively reliable.
Description
Technical field
The present invention relates to a kind of electrocardiograph thermal print protection circuit and method.
Background technology
The recording mode of electrocardiograph has using following following logger at present：1st, moving coil recorder, 2, position it is anti-
Present logger, 3, dot matrix heat-sensitive type logger：Heat-sensitive type logger is added using the semiconductor of heat-agglomerating on a ceramic substrate
Focus, figure and character are burnt on the heat-sensitive paper of heat colour developing.It is required for being configured with for dot matrix heat-sensitive type logger and beats
Head is printed, the printhead operating current of existing electrocardiograph is excessive, causes electric power system operation irregularity, while for a long time in big electricity
It is easily damaged under stream working condition.
The content of the invention
The purpose of the present invention is to propose to a kind of electrocardiograph thermal print protection circuit and method, circuit is by simulating coarse adjustment
Heated current and heat time are limited with digital accurate adjustment, heating duration is limited by heat stepwise, and heat by detecting
The temperature of piece and the electric current for flowing through heating plate, hardware protection is insured by self- recoverage and regulates and controls the conducting resistance of metal-oxide-semiconductor, so as to control
The electric current for flowing through heating plate in whole loop is made, realizes the protection to prime electric power system, System on Chip/SoC and heating plate.
To achieve these goals, the technical scheme is that：
A kind of electrocardiograph thermal print protection circuit, including thermal printing heating plate, microprocessor control unit and drive
The stepper motor of dynamic heat-sensitive paper, microprocessor control unit connect a stepper motor driving circuit, stepper motor driving circuit
The driving voltage of output is added on driving stepper motor coil, and the thermal printing heating plate has multiple hot spot resistance, micro-
The print data of processor control unit, which is exported to the logic control circuit of thermal printing heating plate, microprocessor control unit, to be had
One analog signal output, the first analog-to-digital conversion input, the second analog-to-digital conversion input and pwm signal output end；PWM believes
The output heating of number output end adjusts wide waveform signal to the logic control circuit of thermal printing heating plate, a thermocouple be attached to plus
Heating plate temperature is detected on backing, and heating plate temperature is sent to the first analog-to-digital conversion input of microprocessor control unit
End；Wherein, analog signal output connection one drive amplification circuit of control of microprocessor control unit, drive amplification circuit
Drive a MOS power tube, provide dc source to heating plate in the amplification section of MOS power tubes, add in the thermal printing
Backing power ground side is provided with a current sampling resistor, and the current signal of taking-up is connected to the of microprocessor control unit
Two analog-to-digital conversion inputs.
Scheme is further：A self- recoverage safeties are provided between dc source and MOS power tubes.
Scheme is further：The print data output of institute's art microprocessor control unit and the logic of thermal printing heating plate
A logic level transition unit is provided between control circuit, thermal printing heating plate is connected in logic level transition unit
Overvoltage crowbar is provided between logic control circuit, overvoltage crowbar is used to prevent thermal printing heating plate high voltage power supply
Return and alter to logic level transition unit.
Scheme is further：The overvoltage crowbar includes current-limiting resistance and voltage-stabiliser tube, and current-limiting resistance, which is serially connected in, is patrolling
Collect level conversion unit to be connected between thermal printing heating plate logic control circuit, in logic level transition unit and current limliting electricity
Resistance is to being connected with the voltage-stabiliser tube between power supply ground.
Scheme is further：The overvoltage crowbar includes capacitance, resistance and diode, and capacitance is serially connected in
Between logic level transition unit is connected to thermal printing heating plate logic control circuit, connected after resistance and diodes in parallel
In logic control circuit and capacitance connection between power supply ground, wherein diode cathode is connected with power supply.
Scheme is further：The stepper motor driving circuit contains a driving coil voltage position limitation protection circuit, institute
It is that a motor coil self-excitation being made up of four diodes in whole bridge rectifier circuit connection is protected to state voltage position limitation protection circuit
Protection circuit, two nodes by two Diode series connections connect the two of motor drive coils respectively in whole bridge rectifier circuit
End, the cathode output end of whole bridge rectifier circuit connect the positive pole of a spacing voltage, the negative pole output of whole bridge rectifier circuit
End connects the negative pole of spacing voltage, and the negative pole of spacing voltage links together with stepper motor driving circuit power supply.
Scheme is further：The pwm signal output end of the microprocessor control unit and patrolling for thermal printing heating plate
Blocking shaping circuit is provided between volume control circuit, the blocking shaping circuit includes phase inverter, and the input of phase inverter leads to
The pwm signal output end that a capacitance is connected to the microprocessor control unit is crossed, the output end of phase inverter is connected to
The logic control circuit.
A kind of electrocardiograph thermal print guard method, it is based on electrocardiograph thermal print protection circuit described above
Method, the protection circuit include thermal printing heating plate, microprocessor control unit and heat-sensitive paper stepper motor driving circuit,
The driving voltage of stepper motor driving circuit output is added on driving stepper motor coil, and the thermal printing heating plate has more
Individual hot spot resistance, the print data output of microprocessor control unit are connected to the logic control electricity of thermal printing heating plate
Road, microprocessor control unit have an analog signal output, the first analog-to-digital conversion input, the second analog-to-digital conversion input
With pwm signal output end, the output heating of pwm signal output end adjusts wide waveform signal to the logic control electricity of thermal printing heating plate
Road；One thermocouple is attached to detection heating plate temperature on heating plate, and heating plate temperature is sent into microprocessor control list
First analog-to-digital conversion input of member；Analog signal output output connection one driving of control of microprocessor control unit is put
Big circuit, one MOS power tube of drive amplification circuit drives, the amplification section of MOS power tubes to heating plate provide direct current
Source, the thermal printing heating plate power ground side is provided with a current sampling resistor, the current signal of taking-up is connected to
Second analog-to-digital conversion input of microprocessor control unit；
Wherein, the electric current that collection printing heating plate temperature and printing heating plate pass through in real time in print procedure, and perform
Following safeguard measure：
When heating plate temperature is more than 65 degrees Celsius, judge whether printer is printing, if printer is in printing shape
State, then stop printing, or reduce the heat time, stop printing if temperature continues rise；
When detecting that electric current is less than maximum more than rated value, then by drive amplification circuit, metal-oxide-semiconductor electric conduction is adjusted
Resistance, by current control within rated value.
Scheme is further：Institute's art rated value is 2A, and maximum is 4A.
Scheme is further：There are multiple hot spot resistor section computer heating controls to the thermal printing heating plate, to every
Section is heated using the pwm signal of microprocessor control unit by adjusting Duty ratio control.
The beneficial effects of the invention are as follows：A variety of methods and circuit are employed, is be combined with each other and avoids complete machine because printing work
Make that electric current is excessive to be caused system power supply abnormal while be also possible to prevent to flow through that heating plate electric current is excessive, and heating plate temperature is too high, burning
Ruin heating plate.Pass through the setting of hardware circuit and software regulation and control and management so that the overtemperature protection of thermal printer is relatively reliable.
The present invention is described in detail with reference to the accompanying drawings and examples.
Brief description of the drawings
Fig. 1 is protection circuit structural schematic block diagram；
Fig. 2 is a kind of logic level transition unit schematic block diagram of the protection circuit containing protection；
Fig. 3 is the logic level transition unit schematic block diagram of protection circuit protection containing another kind；
Fig. 4 is protection circuit driving coil voltage position limitation protection circuit；
Fig. 5 is protection circuit dot matrix heat stepwise control circuit；
Fig. 6 is protection circuit blocking shaping circuit.
Embodiment
A kind of electrocardiograph thermal print protection circuit, as shown in figure 1, protection circuit includes thermal printer 1, microprocessor
Device control unit 2, there are thermal printing heating plate 101, the stepper motor 102 for driving heat-sensitive paper and thermal printing heating in printer
The logic control circuit 103 of piece, microprocessor control unit connect a stepper motor driving circuit 3, driving stepper motor electricity
The driving voltage of road output is added on driving stepper motor coil, and the thermal printing heating plate has multiple hot spot resistance,
Because microprocessor control unit uses 3.3 volts of power supplys, the logic control circuit of thermal printing heating plate uses 5 volts of electricity
Source；Therefore, as shown in Figures 2 and 3, the print data of microprocessor control unit is exported through a logic level transition unit 4
The logic control circuit of thermal printing heating plate is connected to, microprocessor control unit has an analog signal output 201,
One analog-to-digital conversion input 202, the second analog-to-digital conversion input 203 and pwm signal output end, the output of pwm signal output end can
Wide heating waveform signal is adjusted to the logic control circuit of thermal printing heating plate；One thermocouple is attached to detection on heating plate and added
Backing temperature, and heating plate temperature is sent to the first modulus of microprocessor control unit by a temperature detecting unit 5
Conversion inputs；Wherein, analog signal output output connection one drive amplification circuit of control of microprocessor control unit
6, the conducting degree of one MOS power tube 7 of drive amplification circuit drives, i.e.,：Carried in the amplification section of MOS power tubes to heating plate
For 24 volts of dc sources, the thermal printing heating plate power ground side is provided with a current sampling resistor 8, the electricity of taking-up
Stream signal is connected to the second analog-to-digital conversion input of microprocessor control unit through an amplifying circuit 9.
In embodiment：A self- recoverage safeties 10 are provided between dc source and MOS power tubes, self- recoverage is protected
Dangerous device is a kind of existing procucts, is the on-off switch for perceiving sheet metal and realizing by two panels different temperatures, in the present embodiment
The current value that the self- recoverage safeties of setting pass through is 4A, and self- recoverage safeties will be switched off during more than 4A.
In embodiment：As shown in Figures 2 and 3, it is connected to thermal printing heating plate logic control in logic level transition unit
Be provided with overvoltage crowbar between circuit processed, overvoltage crowbar be used to preventing thermal printing heating plate high voltage power supply return alter to
Logic level transition unit and microprocessor control unit；There are two kinds of overvoltage crowbars：
The first is as shown in Fig. 2 the overvoltage crowbar includes current-limiting resistance 10 and voltage-stabiliser tube 11, current-limiting resistance concatenation
Between thermal printing heating plate logic control circuit is connected in logic level transition unit, logic level transition unit with
Current-limiting resistance is to being connected with the voltage-stabiliser tube between power supply ground, the resistance of resistance is 1K ohms in embodiment, the voltage stabilizing of voltage-stabiliser tube
Value is 5 volts, and model is ZMM5V1, and by the Automatic level control of data pin in the range of 0-5V, logic level transition unit is entered
Row hardware protection, when preventing heating plate operation irregularity, 24V electricity, which is loaded directly into data pin, causes chip to burn.
Second as shown in figure 3, the overvoltage crowbar includes capacitance, resistance and diode, capacitance string
It is connected between logic level transition unit is connected to thermal printing heating plate logic control circuit, after resistance and diodes in parallel
Logic control circuit and capacitance connection are connected to between power supply ground, wherein diode cathode is connected with power supply.
In embodiment：The stepper motor driving circuit contains a driving coil voltage position limitation protection circuit, such as Fig. 4 institutes
Show, the voltage position limitation protection circuit is one and connects the motor coil formed certainly in whole bridge rectifier circuit by four diodes
Swash protection circuit 12, two nodes by two Diode series connections connect motor drives line respectively in whole bridge rectifier circuit
The both ends of circle, the cathode output end of whole bridge rectifier circuit connect the positive pole of a spacing voltage, and whole bridge rectifier circuit is born
Pole output end connects the negative pole of spacing voltage, and the negative pole of spacing voltage links together with stepper motor driving circuit power supply,
Spacing voltage in embodiment is 12 volts, and the rated voltage of motor is 10.26V, can be through two poles when driving voltage is higher than 12 volts
The connection of pipe and spacing voltage, and then driving voltage has been carried out spacing.
In embodiment：As shown in Figure 1 and Figure 5, the logic control circuit includes a dot matrix heat stepwise control electricity
Road 13, as shown in figure 5, the multiple adding thermal resistance 101-1 of dot matrix heat stepwise control circuit control thermal printing heating plate
Heat at times, the heat stepwise control circuit includes 1301, latch 1302 of a shift register, and latch is protected
Deposit the data of shift register, the print data output connection shift register of the microprocessor control unit, the temperature-sensitive
Printing heating plate has multiple hot spot resistance, and 24 volts of heating power supplies are being connected just after one end parallel connection of multiple hot spot resistance
Pole VH, the VDD in figure is 5 volts of chip operating voltage, and the other end of multiple hot spot resistance connects a two-input gate electricity respectively
The output end on road 1303, when gate circuit dual input is simultaneously significant level, the output end of gate circuit is opened guiding electric current and passed through
Hot spot resistance, an input of the two-input gate circuit dual input connect the latch, the two-input gate respectively
Another input of circuit dual input is combined to form at least two set of segmentation heating input, two set of segmentation heating input
The pwm signal output end of microprocessor control unit is connected to through a distributor circuit 1304, be here by single-chip microcomputer all the way
The allocated circuit of pwm signal forms multi-channel PWM signal output, naturally it is also possible to single-chip microcomputer output multi-channel pwm signal.
In embodiment：Another input of the multiple gate circuit dual input is combined that to form multigroup heat stepwise defeated
Enter end.
In embodiment：As shown in fig. 6, the pwm signal output end of the microprocessor control unit and the two-input gate
Blocking shaping circuit is provided between another input of circuit dual input, the blocking shaping circuit includes phase inverter 14,
The input of phase inverter is connected to the pwm signal output end of the microprocessor control unit, or warp by a capacitance C
Distributor circuit 1304 is connected to the pwm signal output end of microprocessor control unit, and the output end of phase inverter is connected to the door
Another input of circuit dual input.I.e.：The pwm signal output end of the microprocessor control unit heats with thermal printing
Be provided with blocking shaping circuit between the logic control circuit of piece, the blocking shaping circuit includes phase inverter, phase inverter it is defeated
Enter the pwm signal output end that end is connected to the microprocessor control unit by a capacitance, the output end of phase inverter
The logic control circuit gate circuit is connected to, it is necessary to which explanation is that capacitance " time restriction effect " i.e. time restriction is protected
Shield, when 1304 outputs are low level in short-term, heating plate can heat.If single-chip microcomputer operation irregularity, persistently export low level
When, if being not provided with " protection " here, heating plate will continuous heating, and then burn.If 1304 " lasting " outputs are low
Level, electric capacity C chargings, after a period of time, electric capacity right-hand member is high level, and after inverted device, phase inverter output low level, heating
Piece stops heating.
Embodiment 2：
A kind of electrocardiograph thermal print guard method, it is to be based on electrocardiograph thermal print protection electricity described in embodiment 1
The method on road, the content in embodiment 1 also should be the contents in the present embodiment；The protection circuit heats including thermal printing
Piece, microprocessor control unit and heat-sensitive paper stepper motor driving circuit, the driving voltage of stepper motor driving circuit output add
On driving stepper motor coil, the thermal printing heating plate has multiple hot spot resistance, microprocessor control unit
Print data exports the logic control circuit for being connected to thermal printing heating plate, and microprocessor control unit has an analog signal
Output end, the first analog-to-digital conversion input, the second analog-to-digital conversion input and a pwm signal output end, pwm signal output end
Output heating adjusts wide waveform signal to the logic control circuit of thermal printing heating plate；One thermocouple, which is attached on heating plate, to be examined
Heating plate temperature is surveyed, and heating plate temperature is sent to the first analog-to-digital conversion input of microprocessor control unit；Microprocessor
Analog signal output output connection one drive amplification circuit of control of device control unit, drive amplification circuit drives one
The conducting degree of MOS power tubes provides dc source to heating plate, is provided with the thermal printing heating plate power ground side
One current sampling resistor, the current signal of taking-up are connected to the second analog-to-digital conversion input of microprocessor control unit；
Wherein, the electric current that collection printing heating plate temperature and printing heating plate pass through in real time in print procedure, and perform
Following safeguard measure：
When heating plate temperature is more than 65 degrees Celsius, judge whether printer is printing, if printer is in printing shape
State, then stop printing, or reduce the heat time, stop printing if temperature continues rise；
When detecting that electric current is less than 4A maximums more than 2A rated values, then led by drive amplification circuit, regulation metal-oxide-semiconductor
Be powered resistance, by current control within 2A rated values.
In embodiment：There are multiple hot spot resistor section computer heating controls to the thermal printing heating plate, every section is made
Heated with the pwm signal of microprocessor control unit by adjusting Duty ratio control.
Claims (10)
1. a kind of electrocardiograph thermal print protection circuit, including thermal printing heating plate, microprocessor control unit and driving
The stepper motor of heat-sensitive paper, microprocessor control unit connect a stepper motor driving circuit, and stepper motor driving circuit is defeated
The driving voltage gone out is added on driving stepper motor coil, and the thermal printing heating plate has multiple hot spot resistance, micro- place
The print data of reason device control unit, which is exported to the logic control circuit of thermal printing heating plate, microprocessor control unit, one
Individual analog signal output, the first analog-to-digital conversion input, the second analog-to-digital conversion input and pwm signal output end；Pwm signal
Output end output heating adjusts wide waveform signal to the logic control circuit of thermal printing heating plate, a thermocouple to be attached to heating
Heating plate temperature is detected on piece, and heating plate temperature is sent to the first analog-to-digital conversion input of microprocessor control unit；
Characterized in that, analog signal output connection one drive amplification circuit of control of microprocessor control unit, drive amplification
One MOS power tube of circuit drives, the amplification section of MOS power tubes to heating plate provide dc source, beaten in the temperature-sensitive
Print heating plate power ground side is provided with a current sampling resistor, and the current signal of taking-up is connected to microprocessor control unit
The second analog-to-digital conversion input.
A kind of 2. electrocardiograph thermal print protection circuit according to claim 1, it is characterised in that dc source with
A self- recoverage safeties are provided between MOS power tubes.
A kind of 3. electrocardiograph thermal print protection circuit according to claim 1, it is characterised in that the microprocessor
A logic level is provided between the print data output of control unit and the logic control circuit of thermal printing heating plate to turn
Unit is changed, overvoltage protection electricity is provided between logic level transition unit is connected to thermal printing heating plate logic control circuit
Road, overvoltage crowbar are used to prevent thermal printing heating plate high voltage power supply is returned from altering to logic level transition unit.
A kind of 4. electrocardiograph thermal print protection circuit according to claim 3, it is characterised in that the overvoltage protection
Circuit includes current-limiting resistance and voltage-stabiliser tube, and current-limiting resistance is serially connected in is connected to thermal printing heating plate in logic level transition unit
Between logic control circuit, in logic level transition unit and current-limiting resistance to being connected with the voltage-stabiliser tube between power supply ground.
A kind of 5. electrocardiograph thermal print protection circuit according to claim 3, it is characterised in that the overvoltage protection
Circuit includes capacitance, resistance and diode, and capacitance is serially connected in is connected to thermal printing in logic level transition unit
Logic control circuit is connected between heating plate logic control circuit, after resistance and diodes in parallel to be connected to electricity with capacitance
Between the ground of source, wherein diode cathode is connected with power supply.
A kind of 6. electrocardiograph thermal print protection circuit according to claim 1, it is characterised in that the stepper motor
Drive circuit contains a driving coil voltage position limitation protection circuit, and the voltage position limitation protection circuit is one by four two poles
Pipe in whole bridge rectifier circuit connection composition motor coil self-excitation protection circuit, in whole bridge rectifier circuit two by two two
The node that pole pipe is connected in series connects the both ends of motor drive coils, the cathode output end connection one of whole bridge rectifier circuit respectively
The positive pole of individual spacing voltage, the cathode output end of whole bridge rectifier circuit connect the negative pole of spacing voltage, the negative pole of spacing voltage
Linked together with stepper motor driving circuit power supply.
A kind of 7. electrocardiograph thermal print protection circuit according to claim 1, it is characterised in that the microprocessor
Blocking shaping circuit is provided between the pwm signal output end of control unit and the logic control circuit of thermal printing heating plate,
The blocking shaping circuit includes phase inverter, and the input of phase inverter is connected to the microprocessor control by a capacitance
The pwm signal output end of unit processed, the output end of phase inverter are connected to the logic control circuit.
8. a kind of electrocardiograph thermal print guard method, it is to be based on electrocardiograph thermal print protection electricity described in claim 1
The method on road, the protection circuit include thermal printing heating plate, microprocessor control unit and heat-sensitive paper driving stepper motor
Circuit, the driving voltage of stepper motor driving circuit output are added on driving stepper motor coil, the thermal printing heating plate
With multiple hot spot resistance, the print data output of microprocessor control unit is connected to the logic control of thermal printing heating plate
Circuit processed, microprocessor control unit have an analog signal output, the first analog-to-digital conversion input, the second analog-to-digital conversion defeated
Enter end and pwm signal output end, logic control of the wide waveform signal to thermal printing heating plate is adjusted in the output heating of pwm signal output end
Circuit processed；One thermocouple is attached to detection heating plate temperature on heating plate, and heating plate temperature is sent into microprocessor control
First analog-to-digital conversion input of unit processed；Analog signal output output connection one drive of control of microprocessor control unit
Dynamic amplifying circuit, one MOS power tube of drive amplification circuit drives, provide to heating plate in the amplification section of MOS power tubes it is straight
Power supply is flowed, a current sampling resistor is provided with the thermal printing heating plate power ground side, the current signal of taking-up connects
It is connected to the second analog-to-digital conversion input of microprocessor control unit；Characterized in that, the collection printing in real time in print procedure
The electric current that heating plate temperature and printing heating plate pass through, and perform following safeguard measure：
When heating plate temperature is more than 65 degrees Celsius, judge whether printer is printing, if printer is in print state,
Stop printing, or reduce the heat time, stop printing if temperature continues rise；
When detecting that electric current is less than maximum more than rated value, then by drive amplification circuit, metal-oxide-semiconductor conducting resistance is adjusted,
By current control within rated value.
9. guard method according to claim 8, it is characterised in that institute's art rated value is 2A, and maximum is 4A.
10. guard method according to claim 8, it is characterised in that there is multiple add to the thermal printing heating plate
Focus resistor section computer heating control, every section of pwm signal using microprocessor control unit is added by adjusting Duty ratio control
Heat.
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| CN201510624124.1A CN105249960B (en) | 2015-09-28 | 2015-09-28 | A kind of electrocardiograph thermal print protection circuit and method |
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| CN201510624124.1A CN105249960B (en) | 2015-09-28 | 2015-09-28 | A kind of electrocardiograph thermal print protection circuit and method |
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| CN105249960B true CN105249960B (en) | 2017-12-08 |
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| Publication number | Publication date |
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| CN105249960A (en) | 2016-01-20 |
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