CN219016582U - distance sensing device - Google Patents

distance sensing device Download PDF

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CN219016582U
CN219016582U CN202223073379.8U CN202223073379U CN219016582U CN 219016582 U CN219016582 U CN 219016582U CN 202223073379 U CN202223073379 U CN 202223073379U CN 219016582 U CN219016582 U CN 219016582U
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sensing
distance
light
circuit
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孙伯伟
陈经纬
胡耀升
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Egis Technology Inc
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06Systems determining position data of a target
    • G01S17/08Systems determining position data of a target for measuring distance only
    • G01S17/10Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G01S17/14Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves wherein a voltage or current pulse is initiated and terminated in accordance with the pulse transmission and echo reception respectively, e.g. using counters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483Details of pulse systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483Details of pulse systems
    • G01S7/486Receivers
    • G01S7/4861Circuits for detection, sampling, integration or read-out

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  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
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Abstract

本实用新型提供一种距离感测装置。提供测距光至测距目标而产生反射光。于光感测期间依据光感测二极管在接收崩溃偏压电压期间感测反射光而产生的光感测信号计数光感测二极管的崩溃次数而产生计数值。依据计数值判断距离感测装置与测距目标间的距离。

Figure 202223073379

The utility model provides a distance sensing device. Provide ranging light to the ranging target to generate reflected light. During the photo-sensing period, according to the photo-sensing signal generated by the photo-sensing diode sensing the reflected light during receiving the breakdown bias voltage, counting the breakdown times of the photo-sensing diode to generate a count value. The distance between the distance sensing device and the distance measuring target is judged according to the count value.

Figure 202223073379

Description

距离感测装置distance sensing device

技术领域technical field

本实用新型涉及一种感测装置,尤其涉及一种距离感测装置。The utility model relates to a sensing device, in particular to a distance sensing device.

背景技术Background technique

诸多现代电子装置中皆存在具有光子装置的集成芯片(Integrated chip,IC)。一般来说,光感测芯片常利用光电流积分的方式,将电流转到电压,再利用模拟数字转换器来进行译码。模拟数字转换器具有设计复杂且耗电的缺点,且在低光源的情形下,需要高精度的模拟数字转换电路进行噪声控制或增加光感测二极管的数量,来提高感测灵敏度,然如此将提高电路面积且会使成本上升。此外,以光电流积分的方式来进行信号处理,需要足够的积分时间来避免讯杂比过低,然如此将大幅地限制数据回报速率(report rate)。Integrated chips (ICs) with photonic devices exist in many modern electronic devices. Generally speaking, light sensing chips usually convert the current into a voltage by means of photocurrent integration, and then use an analog-to-digital converter for decoding. Analog-to-digital converters have the disadvantages of complex design and power consumption, and in the case of low light sources, high-precision analog-to-digital conversion circuits are required for noise control or increasing the number of light-sensing diodes to improve sensing sensitivity. This increases the circuit area and increases the cost. In addition, signal processing by means of photocurrent integration requires sufficient integration time to avoid low signal-to-noise ratio, but this will greatly limit the data report rate.

实用新型内容Utility model content

本实用新型提供一种距离感测装置,可在不增加电路面积、成本以及功耗的情形下,提供良好的感测质量以及数据回报速率,且相较于传统的光感测二极管,可以更小的电路面积达到相同的感测敏感度。另,在低强度的反射光的情形下,本实用新型之距离感测装置仍可提供良好的感测质量。The utility model provides a distance sensing device, which can provide good sensing quality and data return rate without increasing the circuit area, cost and power consumption. Compared with the traditional light sensing diode, it can be more Small circuit area achieves the same sensing sensitivity. In addition, in the case of low-intensity reflected light, the distance sensing device of the present invention can still provide good sensing quality.

本实用新型的距离感测装置包括光源、偏压电压产生电路、光感测二极管、淬熄电路、计数器电路以及信号处理电路。光源提供测距光至测距目标而产生反射光。偏压电压产生电路提供崩溃偏压电压或标准偏压电压。光感测二极管的阴极端耦接偏压电压产生电路,感测反射光而产生光感测信号。淬熄电路耦接光感测二极管的阳极端,淬熄光感测二极管。计数器电路耦接光感测二极管的阳极端,于光感测期间依据光感测二极管在接收崩溃偏压电压期间产生的光感测信号计数光感测二极管的崩溃次数而产生计数值。信号处理电路耦接计数器电路,依据计数值判断距离感测装置与测距目标间的距离。The distance sensing device of the utility model comprises a light source, a bias voltage generating circuit, a light sensing diode, a quenching circuit, a counter circuit and a signal processing circuit. The light source provides ranging light to the ranging target to generate reflected light. The bias voltage generating circuit provides a breakdown bias voltage or a standard bias voltage. The cathode terminal of the photo-sensing diode is coupled to the bias voltage generating circuit, which senses the reflected light to generate a photo-sensing signal. The quenching circuit is coupled to the anode terminal of the photo-sensing diode to quench the photo-sensing diode. The counter circuit is coupled to the anode terminal of the photo-sensing diode, and counts the breakdown times of the photo-sensing diode according to the photo-sensing signal generated by the photo-sensing diode during receiving the breakdown bias voltage during the photo-sensing period to generate a count value. The signal processing circuit is coupled to the counter circuit, and judges the distance between the distance sensing device and the distance measuring target according to the count value.

基于上述,本实用新型实施例的光感测二极管可接收崩溃偏压电压并进行光感测而产生光感测信号,计数器电路可依据光感测信号计数光感测二极管的崩溃次数而产生计数值,信号处理电路依据计数值判断距离感测装置与测距目标间的距离。如此利用在极度逆偏状态下的光感测二极管来进行光感测,并利用计数器电路的计数值来计算光感测二极管所感测到的光强度,可避免使用积分器电路,而可在不增加电路面积、成本以及功耗的情形下,提供良好的感测质量以及数据回报速率,且相较于传统的光感测二极管,可以更小的电路面积达到相同的感测敏感度。另,在低强度的反射光的情形下,本实用新型之距离感测装置仍可提供良好的感测质量。Based on the above, the photo-sensing diode of the embodiment of the utility model can receive the collapse bias voltage and perform photo-sensing to generate a photo-sensing signal. The counter circuit can count the number of times the photo-sensing diode collapses according to the photo-sensing signal to generate count value, the signal processing circuit judges the distance between the distance sensing device and the distance measuring target according to the count value. In this way, using the photo-sensing diode in an extremely reverse-biased state to perform light sensing, and using the count value of the counter circuit to calculate the light intensity sensed by the photo-sensing diode can avoid the use of an integrator circuit, and can be used without In the case of increasing circuit area, cost, and power consumption, it provides good sensing quality and data return rate, and compared with traditional photo-sensing diodes, it can achieve the same sensing sensitivity with a smaller circuit area. In addition, in the case of low-intensity reflected light, the distance sensing device of the present invention can still provide good sensing quality.

为让本实用新型的上述特征和优点能更明显易懂,下文特举实施例,并配合附图作详细说明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with accompanying drawings.

附图说明Description of drawings

图1是依照本实用新型实施例的距离感测装置的示意图。FIG. 1 is a schematic diagram of a distance sensing device according to an embodiment of the present invention.

图2是依照本实用新型实施例的光感测信号的波形图。FIG. 2 is a waveform diagram of a light sensing signal according to an embodiment of the present invention.

图3是依照本实用新型另一实施例的距离感测装置的示意图。FIG. 3 is a schematic diagram of a distance sensing device according to another embodiment of the present invention.

图4是依照本实用新型实施例的计数值与距离的关系示意图。Fig. 4 is a schematic diagram of the relationship between the count value and the distance according to the embodiment of the present invention.

图5是依照本实用新型另一实施例的距离感测装置的示意图。FIG. 5 is a schematic diagram of a distance sensing device according to another embodiment of the present invention.

图6是依照本实用新型实施例的距离感测装置的感测方法的流程图。FIG. 6 is a flowchart of a sensing method of a distance sensing device according to an embodiment of the present invention.

具体实施方式Detailed ways

为了使本实用新型之内容可以被更容易明了,以下特举实施例做为本实用新型确实能够据以实施的范例。另外,凡可能之处,在附图及实施方式中使用相同标号的组件/构件,系代表相同或类似部件。In order to make the content of the utility model more understandable, the following specific embodiments are taken as examples in which the utility model can indeed be implemented. In addition, wherever possible, components/members with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts.

以下请参照图1,图1是依照本实用新型一实施例所绘示的距离感测装置的示意图。距离感测装置可包括偏压电压产生电路102、光感测二极管PD1(例如,单光子崩溃二极管Single Photon Avalanche Diode,SPAD)、淬熄(quenching)电路104、计数器电路106、信号处理电路108以及光源110,偏压电压产生电路102耦接光感测二极管PD1的阴极端,淬熄电路104耦接光感测二极管PD1的阳极端。偏压电压产生电路102可用以提供崩溃偏压电压至光感测二极管PD1,而使光感测二极管PD1进入极度逆偏的状态,如此当一光子注入光感测二极管PD1的空乏层时,可触发光感测二极管PD1产生崩溃(avalanche)电流,而提供光感测信号S1。此外,淬熄电路104可在光感测二极管PD1提供光感测信号S1后淬熄光感测二极管PD1,以将光感测二极管PD1的阳极端电压回复到提供光感测信号S1前的电压,淬熄电路104为主动式或被动式,本实用新型并不限定。值得注意的是,在图1实施例中虽仅绘示一个由光感测二极管PD1与淬熄电路104形成的光感测单元,然不以此为限,在其它实施例中,距离感测装置可包括更多个光感测单元,例如由多个光感测单元形成的光感测单元阵列。Please refer to FIG. 1 below. FIG. 1 is a schematic diagram of a distance sensing device according to an embodiment of the present invention. The distance sensing device may include a bias voltage generating circuit 102, a light sensing diode PD1 (for example, a Single Photon Avalanche Diode, SPAD), a quenching circuit 104, a counter circuit 106, a signal processing circuit 108, and The light source 110, the bias voltage generating circuit 102 are coupled to the cathode terminal of the photo-sensing diode PD1, and the quenching circuit 104 is coupled to the anode terminal of the photo-sensing diode PD1. The bias voltage generating circuit 102 can be used to provide a breakdown bias voltage to the photo-sensing diode PD1, so that the photo-sensing diode PD1 enters an extremely reverse-biased state, so that when a photon is injected into the depletion layer of the photo-sensing diode PD1, it can The photo-sensing diode PD1 is triggered to generate an avalanche current to provide a photo-sensing signal S1. In addition, the quenching circuit 104 can quench the photo-sensing diode PD1 after the photo-sensing diode PD1 provides the photo-sensing signal S1, so as to return the anode terminal voltage of the photo-sensing diode PD1 to the voltage before providing the photo-sensing signal S1 , The quenching circuit 104 is active or passive, which is not limited in the present invention. It should be noted that in the embodiment of FIG. 1, although only one light sensing unit formed by the light sensing diode PD1 and the quenching circuit 104 is shown, it is not limited thereto. In other embodiments, the distance sensing The device may include more photo-sensing units, such as an array of photo-sensing units formed of a plurality of photo-sensing units.

计数器电路106可依据光感测信号S1计数光感测二极管PD1的崩溃次数而产生计数值C1给信号处理电路108,信号处理电路108可依据计数值C1判断光感测二极管PD1所感测到的光强度。举例来说,如图2所示,信号处理电路108可依据计数器电路106计数光感测期间T1光感测信号S1的脉冲数量(也就是光感测二极管PD1于光感测期间T1的崩溃次数)所得到的计数值C1,来判断光感测二极管PD1于光感测期间T1所感测到的光强度,其中计数值C1越大代表光感测二极管PD1于光感测期间T1所感测到的光强度越强。其中光感测期间T1可例如为光感测二极管PD1接收崩溃偏压电压的期间,然不以此为限,也可依使用者需求设定为其它期间,例如光源110提供测距光L1的期间、光感测二极管PD1处于逆偏状态的期间或计数器电路106执行计数的期间。The counter circuit 106 can count the number of collapses of the light sensing diode PD1 according to the light sensing signal S1 to generate a count value C1 to the signal processing circuit 108, and the signal processing circuit 108 can judge the light sensed by the light sensing diode PD1 according to the count value C1 strength. For example, as shown in FIG. 2 , the signal processing circuit 108 can count the number of pulses of the photo-sensing signal S1 during the photo-sensing period T1 according to the counter circuit 106 (that is, the number of collapses of the photo-sensing diode PD1 during the photo-sensing period T1 ) to determine the light intensity sensed by the light sensing diode PD1 during the light sensing period T1, where the larger the count value C1 represents the light intensity sensed by the light sensing diode PD1 during the light sensing period T1 The stronger the light intensity. The photo-sensing period T1 can be, for example, the period during which the photo-sensing diode PD1 receives the breakdown bias voltage, but it is not limited thereto, and can also be set to other periods according to user needs, for example, the light source 110 provides the distance-measuring light L1 period, the period when the photo-sensing diode PD1 is in the reverse bias state, or the period when the counter circuit 106 performs counting.

如图3所示,当距离感测装置进行距离感测时,光源110可提供测距光L1,测距光L1在被测距目标OB1反射后产生反射光L2,光源110可例如为雷射光源,然不以此为限。光感测二极管PD1可感测反射光L2而产生光感测信号S1。计数器电路106依据光感测信号S1计数光感测二极管PD1的崩溃次数而产生计数值C1给信号处理电路108。信号处理电路108则可依据计数值C1判断距离感测装置与测距目标OB1间的距离,其中计数值C1越大代表距离感测装置与测距目标OB1间的距离越短。As shown in Figure 3, when the distance sensing device performs distance sensing, the light source 110 can provide distance measuring light L1, and the distance measuring light L1 generates reflected light L2 after being reflected by the distance measuring target OB1, and the light source 110 can be, for example, a laser Light source, but not limited to this. The photo-sensing diode PD1 can sense the reflected light L2 to generate a photo-sensing signal S1. The counter circuit 106 counts the breakdown times of the photo-sensing diode PD1 according to the photo-sensing signal S1 to generate a count value C1 to the signal processing circuit 108 . The signal processing circuit 108 can determine the distance between the distance sensing device and the ranging object OB1 according to the count value C1, wherein a larger count value C1 means a shorter distance between the distance sensing device and the ranging object OB1.

如此通过将光感测二极管PD1偏压至极度逆偏的状态,可提高距离感测装置对噪声的抵抗能力,即使在光感测二极管PD1所接收到的反射光L2具有低强度的情形下仍可准确地判断距离感测装置与测距目标OB1间的距离,而具有良好的感测质量。举例来说,当光感测二极管PD1应用于邻近传感器(proximity sensor)时,在邻近传感器与测距目标间的距离较远而导致光感测二极管PD1所接收到的反射光L2强度明显下降的情形下,感测二极管PD1仍可提供高讯杂比的光感测信号S1,而可精准地判断邻近传感器与测距目标间的距离。此外利用计数器电路106计数光感测二极管PD1的崩溃次数所产生计数值C1来判断距离感测装置与测距目标OB1间的距离,可不需设置积分器与模拟数字转换器,而可进一步缩小电路面积、降低功率消耗并降低生产成本,相较于传统的光感测二极管,可以更小的电路面积达到相同的感测敏感度。In this way, by biasing the photo-sensing diode PD1 to an extremely reverse-biased state, the resistance of the distance sensing device to noise can be improved, even when the reflected light L2 received by the photo-sensing diode PD1 has a low intensity. The distance between the distance sensing device and the ranging object OB1 can be accurately judged, and the sensing quality is good. For example, when the photo-sensing diode PD1 is applied to a proximity sensor, the intensity of the reflected light L2 received by the photo-sensing diode PD1 decreases significantly due to the relatively long distance between the proximity sensor and the ranging target. Under such circumstances, the sensing diode PD1 can still provide a light sensing signal S1 with a high signal-to-noise ratio, so as to accurately determine the distance between the adjacent sensor and the ranging target. In addition, the counter circuit 106 is used to count the number of breakdowns of the photo-sensing diode PD1 to generate the count value C1 to determine the distance between the distance sensing device and the distance-measuring target OB1, which eliminates the need for an integrator and an analog-to-digital converter, and further reduces the circuit size. area, lower power consumption, and lower production costs. Compared with conventional light-sensing diodes, the same sensing sensitivity can be achieved with a smaller circuit area.

此外,信号处理电路108还可依据距离感测装置与测距目标OB1间的距离判断是否执行预设操作。其中预设操作可随距离感测装置的应用而有所不同,举例来说,假设距离感测装置为应用于手机,预设操作可例如为开启或关闭手机的屏幕显示,例如在距离感测装置与测距目标OB1间的距离由大于距离门槛值变化至小于距离门槛值时,信号处理电路108可关闭手机的屏幕功能,而当距离感测装置与测距目标OB1间的距离由小于距离门槛值变化至大于距离门槛值时,信号处理电路108可开启手机的屏幕功能,如此可在用户接听电话时关闭手机的屏幕功能,并在结束通话将手机移离面部时恢复手机的屏幕功能。In addition, the signal processing circuit 108 can also determine whether to execute a preset operation according to the distance between the distance sensing device and the ranging object OB1. Wherein the default operation can vary with the application of the distance sensing device. For example, if the distance sensing device is applied to a mobile phone, the default operation can be, for example, turning on or off the screen display of the mobile phone. When the distance between the device and the ranging object OB1 changes from greater than the distance threshold value to less than the distance threshold value, the signal processing circuit 108 can turn off the screen function of the mobile phone, and when the distance between the distance sensing device and the ranging object OB1 changes from less than the distance threshold value When the threshold value changes to be greater than the distance threshold value, the signal processing circuit 108 can turn on the screen function of the mobile phone, so that the screen function of the mobile phone can be turned off when the user answers the call, and the screen function of the mobile phone can be restored when the user ends the call and moves the mobile phone away from the face.

其中距离门槛值可如图4所示,通过设定对应距离门槛值的计数门槛值TH1来达成,当计数值C1大于计数门槛值TH1时代表距离感测装置与测距目标OB1间的距离小于距离门槛值,而当计数值C1小于计数门槛值TH1时代表距离感测装置与测距目标OB1间的距离大于距离门槛值。值得注意的是,预设操作并不以开启手机的屏幕功能为限,在其他实施例中,预设操作也可为蓝牙耳机的连接功能的启动与关闭,例如当距离感测装置与测距目标OB1间的距离由大于距离门槛值变化至小于距离门槛值时,信号处理电路108可开启蓝牙耳机的的连接功能,以与播放装置连接,而当距离感测装置与测距目标OB1间的距离由小于距离门槛值变化至大于距离门槛值时,信号处理电路108可关闭蓝牙耳机的的连接功能,以断开与播放装置的连接。值得注意的是,距离门槛值的数量并不以图4实施例为限,在其它实施例中,也可设定多个不同的距离门槛值,并依据计数值C1与多个距离门槛值间的大小关系变化设定不同的预设操作,而不以图4实施例为限。The distance threshold value can be achieved as shown in Figure 4 by setting the count threshold value TH1 corresponding to the distance threshold value. When the count value C1 is greater than the count threshold value TH1, it means that the distance between the distance sensing device and the ranging target OB1 is less than The distance threshold value, and when the count value C1 is less than the count threshold value TH1, it means that the distance between the distance sensing device and the ranging object OB1 is greater than the distance threshold value. It is worth noting that the preset operation is not limited to turning on the screen function of the mobile phone. In other embodiments, the preset operation can also be the activation and deactivation of the connection function of the Bluetooth headset, for example, when the distance sensing device and the distance measuring device When the distance between the objects OB1 changes from greater than the distance threshold value to less than the distance threshold value, the signal processing circuit 108 can enable the connection function of the Bluetooth headset to connect with the playback device, and when the distance between the distance sensing device and the ranging object OB1 When the distance changes from less than the distance threshold to greater than the distance threshold, the signal processing circuit 108 can disable the connection function of the Bluetooth headset to disconnect the playback device. It should be noted that the number of distance thresholds is not limited to the embodiment shown in Figure 4. In other embodiments, a plurality of different distance thresholds can also be set, and according to the distance between the count value C1 and the plurality of distance thresholds Changes in the size relationship of , set different preset operations, and are not limited to the embodiment in FIG. 4 .

此外,在部分实施例中,信号处理电路108还可依据误差补偿计数值来校正距离感测装置与测距目标间的距离,其中误差补偿计数值可例如包括光源110未提供测距光L1时,计数器电路106依据光感测二极管PD1提供的光感测信号S1进行计数而得到的计数值以及计数器电路106依据光感测二极管PD1感测测距目标OB1以外的物体反射测距光L1所产生的反射光(例如测距光L1因漫射效应而被距离感测装置中的其它组件反射所产生的反射光,然不以此为限)而产生的光感测信号进行计数而得到的计数值至少其中之一。信号处理电路108可例如将计数值C1减去误差补偿计数值,以更精确地获得对应被测距目标OB1反射后产生反射光L2的计数值,从而提高距离感测装置的感测质量。In addition, in some embodiments, the signal processing circuit 108 can also correct the distance between the distance sensing device and the ranging target according to the error compensation count value, wherein the error compensation count value can include, for example, when the light source 110 does not provide the distance measuring light L1 The counter circuit 106 counts according to the photo-sensing signal S1 provided by the photo-sensing diode PD1, and the count value obtained by the counter circuit 106 according to the photo-sensing diode PD1 sensing objects other than the distance-measuring target OB1 to reflect the distance-measuring light L1 The count obtained by counting the light sensing signal generated by counting the reflected light (for example, the reflected light generated by the distance measuring light L1 being reflected by other components in the distance sensing device due to the diffusion effect, but not limited thereto) value of at least one of them. The signal processing circuit 108 may, for example, subtract the error compensation count value from the count value C1 to more accurately obtain the count value corresponding to the reflected light L2 generated after being reflected by the ranging object OB1 , thereby improving the sensing quality of the distance sensing device.

图5是依照本实用新型另一实施例的距离感测装置的示意图。在本实施例中,距离感测装置还可包括开关SW1、切换电路502以及读出电路504,其中开关SW1耦接于光感测二极管PD1的阳极端与淬熄电路104之间,切换电路502耦接于光感测二极管PD1的阳极端、计数器电路106与读出电路504之间,读出电路504还耦接信号处理电路108。其中读出电路504可例如以开关SW2与SW3来实施,开关SW2耦接于光感测二极管PD1的阳极端与计数器电路106之间,开关SW3耦接于光感测二极管PD1的阳极端与读出电路504之间。FIG. 5 is a schematic diagram of a distance sensing device according to another embodiment of the present invention. In this embodiment, the distance sensing device may further include a switch SW1, a switching circuit 502, and a readout circuit 504, wherein the switch SW1 is coupled between the anode terminal of the photo-sensing diode PD1 and the quenching circuit 104, and the switching circuit 502 It is coupled between the anode terminal of the photo-sensing diode PD1 , the counter circuit 106 and the readout circuit 504 , and the readout circuit 504 is also coupled to the signal processing circuit 108 . The readout circuit 504 can be implemented by, for example, switches SW2 and SW3, the switch SW2 is coupled between the anode terminal of the photo-sensing diode PD1 and the counter circuit 106, and the switch SW3 is coupled between the anode terminal of the photo-sensing diode PD1 and the readout circuit 106. out of circuit 504.

信号处理电路108可依据距离感测装置的感测模式控制开关SW1~SW3的导通状态。例如当距离感测装置处于高敏感度感测模式时,控制偏压电压产生电路102提供崩溃偏压电压给光感测二极管PD1的阴极端,控制开关SW1导通并控制切换电路502将光感测二极管PD的阳极端切换连接至计数器电路106(也就是控制开关SW2导通,并控制开关SW3断开),以使距离感测装置在低光照环境下也可保持良好的感测质量。而在距离感测装置处于一般感测模式时,信号处理电路108可控制偏压电压产生电路102提供标准偏压电压至光感测二极管PD1的阴极端,控制开关SW1断开并控制切换电路502将光感测二极管PD1的阳极端切换连接至读出电路504(也就是控制开关SW2断开,并控制开关SW3导通),以使距离感测装置适于在较高光照的环境下进行光感测。The signal processing circuit 108 can control the conduction states of the switches SW1 - SW3 according to the sensing mode of the distance sensing device. For example, when the distance sensing device is in the high-sensitivity sensing mode, the control bias voltage generation circuit 102 provides a collapse bias voltage to the cathode end of the photo-sensing diode PD1, the control switch SW1 is turned on and the switching circuit 502 is controlled to switch the photo-sensing The anode of the detection diode PD is switchably connected to the counter circuit 106 (that is, the control switch SW2 is turned on and the switch SW3 is turned off), so that the distance sensing device can maintain good sensing quality even in low light environments. When the distance sensing device is in the normal sensing mode, the signal processing circuit 108 can control the bias voltage generating circuit 102 to provide a standard bias voltage to the cathode end of the photo-sensing diode PD1, control the switch SW1 to turn off and control the switching circuit 502 Switch the anode end of the photo-sensing diode PD1 to the readout circuit 504 (that is, the control switch SW2 is turned off, and the control switch SW3 is turned on), so that the distance sensing device is suitable for light detection in a relatively high-light environment. Sensing.

其中标准偏压电压小于崩溃偏压电压,标准偏压电压可使光感测二极管PD1进入正偏但未导通的状态或逆偏状态但未达进入极度逆偏的状态,也就是说光感测二极管PD1此时不具有单光子雪崩二极管的特性。读出电路504可例如包括积分器与模拟数字转换器,积分器可对光感测二极管PD1提供的光感测信号进行积分操作而产生积分信号,模拟数字转换器可将积分信号转换为数字信号而产生感测值SD1给信号处理电路108。如此在不同的光照环境下将光感测二极管PD1切换接至计数器电路106或读出电路504,可扩大距离感测装置进行光感测的光强度适用范围,而提高距离感测装置的使用便利性。Wherein the standard bias voltage is less than the collapse bias voltage, the standard bias voltage can make the light-sensing diode PD1 enter a forward-biased but non-conducting state or a reverse-biased state but not enter an extremely reverse-biased state, that is to say, the photosensitive diode PD1 The detection diode PD1 does not have the characteristics of a single photon avalanche diode at this time. The readout circuit 504 may, for example, include an integrator and an analog-to-digital converter. The integrator may perform an integral operation on the light-sensing signal provided by the photo-sensing diode PD1 to generate an integrated signal, and the analog-to-digital converter may convert the integrated signal into a digital signal. And generate the sensing value SD1 to the signal processing circuit 108 . In this way, switching the photo-sensing diode PD1 to the counter circuit 106 or the readout circuit 504 under different lighting environments can expand the applicable range of light intensity of the distance sensing device for light sensing, and improve the convenience of use of the distance sensing device. sex.

图6是依照本实用新型实施例的距离感测装置的感测方法的流程图。由上述实施例可知,距离感测装置的感测方法可至少包括下列步骤。首先,提供测距光至测距目标而产生反射光(步骤S602)。然后,提供崩溃偏压电压至光感测二极管(步骤S604)。接着,于光感测期间依据光感测二极管在接收崩溃偏压电压期间感测反射光而产生的光感测信号计数光感测二极管的崩溃次数而产生计数值(步骤S606)。之后,依据计数值判断距离感测装置与测距目标间的距离(步骤S608)。在部分实施例中,还可依据误差补偿计数值与计数值判断距离感测装置与测距目标间的距离,例如将计数值减去误差补偿计数值,以校正距离感测装置的感测结果。其中误差补偿计数值可例如包括光源未提供测距光时,依据光感测二极管提供的光感测信号进行计数而得到的计数值以及依据光感测二极管感测测距目标以外的物体反射测距光所产生的反射光而产生的光感测信号进行计数而得到的计数值至少其中之一。然后,依据距离感测装置与测距目标间的距离判断是否执行预设操作(步骤S610),例如可依据距离感测装置与测距目标间的距离以及距离门槛值判断是否执行预设操作。FIG. 6 is a flowchart of a sensing method of a distance sensing device according to an embodiment of the present invention. It can be known from the above embodiments that the sensing method of the distance sensing device may at least include the following steps. Firstly, a ranging light is provided to a ranging target to generate reflected light (step S602 ). Then, provide a breakdown bias voltage to the photo-sensing diode (step S604). Next, during the photo-sensing period, according to the photo-sensing signal generated by the photo-sensing diode sensing the reflected light during receiving the breakdown bias voltage, counting the breakdown times of the photo-sensing diode to generate a count value (step S606 ). Afterwards, the distance between the distance sensing device and the distance measuring target is determined according to the count value (step S608 ). In some embodiments, the distance between the distance sensing device and the distance measurement target can be determined according to the error compensation count value and the count value, for example, the count value is subtracted from the error compensation count value to correct the sensing result of the distance sensing device . The error compensation count value may, for example, include the count value obtained by counting according to the light sensing signal provided by the light sensing diode when the light source does not provide the distance measuring light, and the count value obtained by sensing the reflection of objects other than the distance measuring target by the light sensing diode. At least one of the count values obtained by counting the light sensing signal generated by the reflected light generated by the distance light. Then, determine whether to execute the preset operation according to the distance between the distance sensing device and the ranging target (step S610 ), for example, determine whether to perform the preset operation according to the distance between the distance sensing device and the ranging target and a distance threshold.

综上所述,本实用新型实施例的光感测二极管可接收崩溃偏压电压并进行光感测而产生光感测信号,计数器电路可依据光感测信号计数光感测二极管的崩溃次数而产生计数值,信号处理电路依据计数值判断距离感测装置与测距目标间的距离。如此利用在极度逆偏状态下的光感测二极管来进行光感测,并利用计数器电路的计数值来计算光感测二极管所感测到的光强度,可避免使用积分器电路,可在不增加电路面积、成本以及功耗的情形下,提供良好的感测质量以及数据回报速率,且相较于传统的光感测二极管,可以更小的电路面积达到相同的感测敏感度。另,在低强度的反射光的情形下,本实用新型之距离感测装置仍可提供良好的感测质量。In summary, the photo-sensing diode of the embodiment of the present invention can receive the breakdown bias voltage and perform photo-sensing to generate a photo-sensing signal. A count value is generated, and the signal processing circuit judges the distance between the distance sensing device and the distance measuring target according to the count value. In this way, using the photo-sensing diode in an extremely reverse-biased state to perform light sensing, and using the count value of the counter circuit to calculate the light intensity sensed by the photo-sensing diode can avoid the use of an integrator circuit, and can be used without increasing In terms of circuit area, cost, and power consumption, it provides good sensing quality and data return rate, and compared with traditional light sensing diodes, it can achieve the same sensing sensitivity with a smaller circuit area. In addition, in the case of low-intensity reflected light, the distance sensing device of the present invention can still provide good sensing quality.

虽然本实用新型已以实施例揭示如上,然其并非用以限定本实用新型,任何所属技术领域中技术人员,在不脱离本实用新型的精神和范围内,当可作些许的更改与润饰,故本实用新型的保护范围当视权利要求所界定的为准。Although the present utility model has been disclosed above with the embodiments, it is not intended to limit the present utility model. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be as defined by the claims.

Claims (9)

1. A distance sensing device, comprising:
a light source for providing ranging light to the ranging target to generate reflected light;
a bias voltage generating circuit for providing a breakdown bias voltage or a standard bias voltage;
a photo-sensing diode, the cathode terminal of which is coupled to the bias voltage generating circuit, for sensing the reflected light to generate a photo-sensing signal;
the quenching circuit is coupled with the anode end of the light sensing diode and used for quenching the light sensing diode;
the counter circuit is coupled with the anode end of the light sensing diode and used for counting the breakdown times of the light sensing diode according to the light sensing signal generated by the light sensing diode in the period of receiving the breakdown bias voltage in the light sensing period to generate a count value; and
and the signal processing circuit is coupled with the counter circuit and used for judging the distance between the distance sensing device and the distance measuring target according to the count value.
2. The distance sensing device of claim 1, wherein the signal processing circuit further determines a distance between the distance sensing device and the ranging target based on an error compensation count value and the count value.
3. The distance sensing apparatus according to claim 2, wherein the error compensation count value includes a count value counted by the counter circuit according to the light sensing signal provided by the light sensing diode when the light source does not provide the distance measuring light.
4. The distance sensing apparatus according to claim 2, wherein the error compensation count value includes a count value obtained by counting by the counter circuit in accordance with a light sensing signal generated by the light sensing diode sensing reflected light generated by reflecting the distance measuring light by an object other than the distance measuring target.
5. The distance sensing apparatus according to claim 2, wherein the signal processing circuit subtracts the error compensation count value from the count value to compensate the count value, and determines a distance between the distance sensing apparatus and the ranging target based on the compensated count value.
6. The distance sensing device according to claim 1, wherein the signal processing circuit further determines whether to perform a predetermined operation according to a distance between the distance sensing device and the ranging target and a distance threshold value.
7. The distance sensing device of claim 1, further comprising:
a first switch coupled between the anode terminal of the photo-sensing diode and the quenching circuit;
the switching circuit is coupled between the anode end of the light sensing diode and the counter circuit; and
the sensing circuit is coupled between the switching circuit and the signal processing circuit, and is used for performing an integration operation on the photo-sensing signal to generate a sensing value for the signal processing circuit, and when the distance sensing device is in a high-sensitivity sensing mode, the signal processing circuit controls the bias voltage generating circuit to provide the breakdown bias voltage to the cathode end of the photo-sensing diode, controls the first switch to be conducted and controls the switching circuit to switch and connect the anode end of the photo-sensing diode to the counter circuit, and when the distance sensing device is in a normal sensing mode, controls the bias voltage generating circuit to provide the standard bias voltage to the cathode end of the photo-sensing diode, and controls the first switch to be disconnected and controls the switching circuit to switch and connect the anode end of the photo-sensing diode to the sensing circuit, wherein the standard bias voltage is smaller than the breakdown bias voltage.
8. The distance sensing device of claim 7, wherein the switching circuit comprises:
the second switch is coupled between the anode end of the light sensing diode and the counter circuit, is controlled by the signal processing circuit to be conducted in the high-sensitivity sensing mode and is disconnected in the general sensing mode; and
and the third switch is coupled between the anode end of the light sensing diode and the readout circuit, is controlled by the signal processing circuit to be turned on in the general sensing mode and turned off in the high-sensitivity sensing mode.
9. The distance sensing device of claim 1, wherein the light source comprises a laser light source.
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