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Probe heating circuit of quick body temperature measuring device

A technology for measuring devices and heating circuits, applied in measuring devices, measuring heat, electric heating devices, etc., can solve the problems of lack of safety guarantee, single heating and control function, and failure to meet safety requirements, so as to achieve the goal of improving safety Effect

Active Publication Date: 2008-05-28
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] However, the existing design of these two heater circuits is basically only a single heating and control function, which cannot meet the safety requirements of existing medical testing equipment under a single fault, especially when the probe is overheated. Lack of security guarantees

Method used

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  • Probe heating circuit of quick body temperature measuring device
  • Probe heating circuit of quick body temperature measuring device
  • Probe heating circuit of quick body temperature measuring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment one, as Figure 4 Shown is the probe heating circuit for the heating energy control module to realize the overtime protection function. The heating energy control module includes the overtime protection circuit 3, and the processor is embedded in the probe of the body temperature module to generate the driving switch circuit between on and off modes. The PWM control signal switched between, that is, the signal 1 in the figure, it can control the output power of the probe heater by changing the PWM duty cycle. The heating unit is the heating resistor R2 in the figure. In this embodiment, the switch circuit is a switch circuit K2 connected in series between the heating resistor R2 and the ground.

[0048] There are two kinds of power supplies in this embodiment: one is the heating power supply AVCC, which is specially used for the heater, and is generally 5V; the other is the digital part power supply VDD, which is generally 3.3V, which is used for the power s...

Embodiment 2

[0060] Embodiment 2. The difference from Embodiment 1 is that the heating energy control module controls the heat provided to the heating resistor through current limiting. The principle of current limiting in this embodiment is: the heater power supply AVCC is connected with a short-circuit limiter for the probe. current protection circuit, and the controllable switch circuit used to connect the current loop of the heating unit is connected between the current limiting protection circuit and the heating unit, and the switch state of the switching circuit is determined by the PWM control signal output by the processor and the output of the current limiting protection circuit The signals are jointly controlled, and only when the two control signals are valid at the same time, the switch circuit will be completely turned on to connect the current loop of the heating unit, so that the heating unit will generate heat to heat up the probe. The current limiting protection circuit can...

Embodiment 3

[0064] Embodiment 3, as shown in Figure 6, on the basis of the above embodiment, a probe heating circuit with a fault detection function is added, and the fault detection circuit 2 is used to monitor the current state of the heater channel, and output a corresponding signal to the processor after a fault is found system for related operations, such as alarming and turning off heaters, etc. The fault detection circuit 2 can be a follower or a comparator. In FIG. 6, the operational amplifier A1 is connected as a follower, the positive input terminal of the operational amplifier A1 is connected to the second terminal of the current limiting resistor R3, and the voltage value at this point is sampled, and the output Signal 3, signal 3 is sent to the ADC input port of the embedded processor for sampling and monitoring heater status: when the heating circuit is normal, the voltage of signal 3 is less than AVCC-U eb0 ; When the heating circuit is short-circuited, the signal 3 voltage...

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Abstract

The invention discloses a probe heating circuit of a fast body temperature measuring device, which comprises heating units, a switch circuit, a processor, and a heating energy control module, wherein the heating units and the switch circuit are connected in series between a heating power supply and the ground, a PWM control signal which is output by a response processor and a control signal which is output by a heating energy control module are only used when the PWM control signal and the heating energy control module output control signals are simultaneously valid, a current loop which is flown through the heating units is communicated after the control signals are effectively conducted, thereby energy which is provided for the heating channel is controlled, the heating units can not be overheated, and the safety of the heating circuit is improved.

Description

【Technical field】 [0001] The invention relates to a rapid body temperature measuring device, in particular to a probe heating circuit of the rapid body temperature measuring device. 【Background technique】 [0002] The human body temperature measurement method is divided into two categories according to the form of the temperature probe: one is the direct contact method, which uses the heat balance method to obtain the body temperature. The probe can be a thermistor, platinum resistance thermometer, mercury, etc. The disadvantage is that it takes a certain amount of time to reach thermal equilibrium, so the measurement time is long; the other type is non-contact, which uses the heat radiation of the human body to obtain body temperature, and the probe can be an infrared sensor. This method has the characteristics of short measurement time, but large measurement errors. [0003] The body temperature measurement for medical diagnosis generally adopts the first type of method to...

Claims

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Application Information

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IPC IPC(8): G01K1/00G01K7/00H05B1/02H05B3/00H05B3/02H03K17/284H03K17/687
Inventor 王兵岑建阳范青叶继伦
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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