Driving circuit, integrated circuit and electronic device

Abstract

The present application discloses a driving circuit, an integrated circuit, and an electronic device. The driving circuit is used to drive a light-emitting module, including: a first end of a driving switch module is connected to the light-emitting module, a second end of the driving switch module is grounded, a feedback node is provided between the first end and the second end of the driving switch module, an input end of a first operational amplifier circuit is connected to the feedback node, and an output end of the first operational amplifier circuit is connected to a control end of the driving switch module. An input end of a second operational amplifier circuit is connected to the feedback node, and an output end of the second operational amplifier circuit is connected to a control end of the driving switch module. The bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold, the path between the first operational amplifier circuit and the driving switch module is disconnected. The driving circuit provided in the embodiment of the present application can simultaneously meet the requirements of low power consumption and high signal-to-noise ratio.

Description

Technical Field

[0001] The present application relates to the field of integrated circuits, and more specifically, to a driving circuit, an integrated circuit, and an electronic device. Background Art

[0002] As people's living standards continue to improve, the demand and requirements for wearable health measurement devices continue to increase. Wearable health measurement devices can be used to detect multiple health indicators of users, such as breathing, heart rate, temperature, blood pressure, etc. In recent years, the detection technology of detecting users' health indicators with the help of photoelectric signals has continued to mature and develop. By driving the light source to emit a light signal to illuminate the user's skin surface, and then obtaining relevant information about the user's health indicators based on the reflected light signal.

[0003] However, in the wearable health measurement system, the requirements for system power consumption are relatively strict. At the same time, due to the large noise in the application environment and the weak effective signal, in order to better measure the effective signal, the wearable health measurement system also needs to have a high signal-to-noise ratio.

[0004] In the related art, the system power consumption is reduced by shortening the setup time of the driving circuit, and the signal-to-noise ratio is improved by reducing the noise of the light source driving circuit. However, if the setup time of the driving circuit is shortened, the noise of the driving circuit will increase, resulting in the wearable health measurement system being unable to meet the requirements of low power consumption and high signal-to-noise ratio at the same time. Summary of the invention

[0005] In view of the above problems, the present invention proposes a driving circuit, an integrated circuit and an electronic device to improve the above problems.

[0006] In a first aspect, an embodiment of the present application provides a driving circuit for driving a light-emitting module, wherein the driving circuit includes: a driving switch module, a first operational amplifier circuit, and a second operational amplifier circuit. The first end of the driving switch module is connected to the light-emitting module, the second end of the driving switch module is grounded, and a feedback node is provided between the first end and the second end of the driving switch module. The input end of the first operational amplifier circuit is connected to the feedback node, and the output end of the first operational amplifier circuit is connected to the control end of the driving switch module. The input end of the second operational amplifier circuit is connected to the feedback node, and the output end of the second operational amplifier circuit is connected to the control end of the driving switch module. The bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold value, the path between the first operational amplifier circuit and the driving switch module is disconnected.

[0007] In some embodiments, the first operational amplifier circuit includes a first operational amplifier and a first switch. One input terminal of the first operational amplifier is connected to a feedback node, and the other input terminal of the first operational amplifier is used to receive a reference voltage. The first terminal of the first switch is connected to the output terminal of the first operational amplifier, and the second terminal of the first switch is connected to the control terminal of the driving switch module; the first switch is used to disconnect the path between the first operational amplifier circuit and the driving switch module when the driving current is greater than or equal to a preset threshold.

[0008] In some embodiments, the second operational amplifier circuit includes a second operational amplifier, one input terminal of the second operational amplifier is connected to the feedback node, and the other input terminal of the second operational amplifier is used to receive a reference voltage; the output terminal of the second operational amplifier is connected to the control terminal of the driving switch module.

[0009] In some embodiments, the second operational amplifier circuit also includes a second switch, a first end of the second switch is connected to the output end of the second operational amplifier, and a second end of the second switch is connected to the control end of the driving switch module; the second switch is used to open the path between the output end of the second operational amplifier and the driving switch module when the driving circuit is working.

[0010] In some embodiments, the first operational amplifier circuit includes a third operational amplifier, and the third operational amplifier includes a first amplifying unit and a first enabling switch. An input end of the first amplifying unit is connected to a feedback node, another input end of the first amplifying unit is used to receive a reference voltage, and an output end of the first amplifying unit is connected to a control end of a driving switch module. The first enabling switch is connected to an enabling end of the first amplifying unit, and is used to stop enabling the first amplifying unit when the driving current is greater than or equal to a preset threshold.

[0011] In some embodiments, the driving circuit further includes a timing control circuit connected to the first operational amplifier circuit. The timing control circuit is used to generate a timing control signal, and the timing control signal is used to control the path between the first operational amplifier circuit and the driving switch module to be disconnected when the driving current of the driving circuit is greater than or equal to a preset threshold.

[0012] In a second aspect, an embodiment of the present application further provides an integrated circuit, comprising the driving circuit of the first aspect described above.

[0013] In a third aspect, an embodiment of the present application further provides an electronic device, comprising a device body and a driving circuit as described in the first aspect above and arranged in the device body.

[0014] In some embodiments, the electronic device includes a light emitting module, which is disposed in the device body and connected to the driving circuit.

[0015] In some embodiments, the electronic device further includes a photoelectric sensor, which is disposed on the device body.

[0016] The technical solution provided by the present invention is to drive the light-emitting module by setting a driving circuit, wherein the driving circuit includes: a driving switch module for driving the light-emitting module to emit light, a first end of the driving switch module connected to the light-emitting module, a second end of the driving switch module grounded, and a feedback node between the first end and the second end of the driving switch module. The input end of the first operational amplifier circuit is connected to the feedback node, and the output end of the first operational amplifier circuit is connected to the control end of the driving switch module. The input end of the second operational amplifier circuit is connected to the feedback node, and the output end of the second operational amplifier circuit is connected to the control end of the driving switch module. Wherein, the bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold, the path between the first operational amplifier circuit and the driving switch module is disconnected. In this way, the driving circuit is quickly established by the first operational amplifier circuit and the second operational amplifier circuit, the establishment time of the driving circuit is reduced, the power consumption of the driving circuit is reduced, and when the driving circuit reaches the preset threshold, the first operational amplifier circuit is disconnected to reduce the noise of the driving circuit and improve the signal-to-noise ratio of the driving circuit, so that the driving circuit meets the requirements of low power consumption and high signal-to-noise ratio at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments and drawings obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Figure 1 A module block diagram of a driving circuit provided in an embodiment of the present application is shown.

[0019] Figure 2 A comparison diagram of the current variation curve of the driving circuit in the embodiment of the present application and the current variation curve of the prior art is shown.

[0020] Figure 3 A module block diagram of a load module provided in an embodiment of the present application is shown.

[0021] Figure 4 A schematic structural diagram of a first operational amplifier circuit provided in an embodiment of the present application is shown.

[0022] Figure 5 A schematic structural diagram of a second operational amplifier circuit provided in an embodiment of the present application is shown.

[0023] Figure 6 A schematic structural diagram of another first operational amplifier circuit provided in an embodiment of the present application is shown.

[0024] Figure 7 A schematic structural diagram of another second operational amplifier circuit provided in an embodiment of the present application is shown.

[0025] Figure 8 A schematic diagram of the structure of a driving circuit provided in an embodiment of the present application is shown.

[0026] Fig. 9 A schematic structural diagram of an integrated circuit provided in an embodiment of the present application is shown.

[0027] Fig.10 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown.

[0028] Fig.11 A schematic flow chart of a driving method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] In the wearable health measurement system, PPG (Photo Plethysmo Graph) can be used to detect information such as human heart rate during exercise. That is, the light-emitting module is driven by a driving circuit to emit light of a preset wavelength, and the light is irradiated to the skin surface. When the light beam passes through the skin tissue and then reflects to the photosensor, the received light is converted into an electrical signal, thereby obtaining information such as human heart rate.

[0031] Since the wearable health measurement system has strict requirements on system power consumption, and at the same time, due to the large noise in the application environment and the weak effective signal, in order to better measure the effective signal, the wearable health measurement system needs to ensure a high signal-to-noise ratio and low system power consumption.

[0032] In the related art, the system power consumption is reduced by shortening the setup time of the driving circuit, and the signal-to-noise ratio is improved by reducing the noise of the light source driving circuit. However, if the setup time of the driving circuit is shortened, the noise of the driving circuit will increase, resulting in the wearable health measurement system being unable to meet the requirements of low power consumption and high signal-to-noise ratio at the same time.

[0033] In order to improve the above problems, the inventors have proposed a driving circuit, an integrated circuit and an electronic device provided by the present application, wherein the driving circuit includes a driving switch module, a first operational amplifier circuit and a second operational amplifier circuit. Wherein, the first end of the driving switch module is connected to the light-emitting module, the second end of the driving switch module is grounded, and a feedback node is provided between the first end and the second end of the driving switch module. The input end of the first operational amplifier circuit is connected to the feedback node, and the output end of the first operational amplifier circuit is connected to the control end of the driving switch module. The input end of the second operational amplifier circuit is connected to the feedback node, and the output end of the second operational amplifier circuit is connected to the control end of the driving switch module. Wherein, the bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold, the path between the first operational amplifier circuit and the driving switch module is disconnected. In this way, the driving circuit is quickly established through the first operational amplifier circuit and the second operational amplifier circuit, the establishment time of the driving circuit is reduced, the power consumption of the driving circuit is reduced, and when the driving circuit reaches the preset threshold, the first operational amplifier circuit is disconnected to reduce the noise of the driving circuit and improve the signal-to-noise ratio of the driving circuit, so that the driving circuit meets the requirements of low power consumption and high signal-to-noise ratio at the same time.

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0035] Figure 1 A module block diagram of a driving circuit provided in an embodiment of the present application is shown, such as Figure 1 As shown, the driving circuit 100 includes a driving switch module 110, a first operational amplifier circuit 120, and a second operational amplifier circuit 130. The first end a1 of the driving switch module 110 is connected to the light emitting module, the second end a2 of the driving switch module 110 is grounded, and a feedback node a3 is provided between the first end a1 and the second end a2 of the driving switch module 110. The input end b1 of the first operational amplifier circuit 120 is connected to the feedback node a3, and the output end b2 of the first operational amplifier circuit 120 is connected to the control end a4 of the driving switch module 110. The input end c1 of the second operational amplifier circuit 130 is connected to the feedback node a3, and the output end c2 of the second operational amplifier circuit 130 is connected to the control end a4 of the driving switch module 110. The driving circuit is established by the driving switch module 110, the first operational amplifier circuit 120, and the second operational amplifier circuit 130 to drive the light emitting module to emit light.

[0036] When the driving current of the driving circuit 100 is less than the preset threshold value, the first operational amplifier circuit 120 and the second operational amplifier circuit 130 respectively form a loop with the driving switch module 110, that is, the first operational amplifier circuit 120 and the driving switch module 110 form a first feedback loop, and the second operational amplifier circuit 130 and the driving switch module 110 form a second feedback loop. In addition, in the embodiment of the present application, the bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, that is, the loop bandwidth of the first feedback loop is greater than the loop bandwidth of the second feedback loop. Since the loop bandwidth of the operational amplifier feedback loop is larger, the feedback loop is faster and the required time is shorter, so the establishment time of the first feedback loop is less than the establishment time of the second feedback loop. Therefore, compared with the prior art that only uses a single feedback loop, the embodiment of the present application can shorten the establishment time of the feedback loop by increasing the first operational amplifier circuit with a larger bandwidth, so that the driving current output by the driving circuit 100 reaches the preset threshold more quickly. When the driving current reaches the preset threshold, the noise in the circuit can be reduced by cutting off the first feedback loop.

[0037] like Figure 2 As shown, Figure 2 A comparison diagram of the current change curve of the driving circuit 100 of the embodiment of the present application and the current change curve of the prior art is shown, wherein k1 is the first current change curve k1 of the driving circuit 100 of the embodiment of the present application during the establishment process, and k2 is the second current change curve of the driving circuit 100 of the embodiment of the present application during the establishment process of the driving circuit with only a single feedback loop in the prior art. Compared with the prior art, the driving circuit 100 of the embodiment of the present application can establish the loop current more quickly by adding a first loop with a larger bandwidth when starting the operation. Therefore, the current value of the driving circuit 110 of the embodiment of the present application can reach the preset threshold value I at the first moment t1. 驱动电流 , whereas in the prior art, the driving circuit that only sets a single feedback loop needs to wait until the second moment t2 for the current value to reach the preset threshold value I 驱动电流 Therefore, compared with the circuit structure in which only a single feedback loop is set, the loop bandwidth of the driving circuit 110 in the embodiment of the present application is increased, which can improve the establishment efficiency of the driving circuit and reduce the power consumption of the driving circuit.

[0038] Further, since the loop bandwidth of the operational amplifier feedback loop is negatively correlated with the area of ​​the operational amplifier, and the smaller the area of ​​the operational amplifier circuit, the greater the noise, the area of ​​the first operational amplifier circuit 120 with a larger bandwidth is smaller than the area of ​​the second operational amplifier circuit 130 with a smaller bandwidth, and the noise of the first operational amplifier circuit 120 is greater than the noise of the second operational amplifier circuit 130. In this embodiment, when the driving current of the driving circuit 100 is greater than or equal to the preset threshold, the path between the first operational amplifier circuit 120 and the driving switch module 110 is disconnected, thereby cutting off the first feedback loop, so as to reduce the noise of the driving circuit and improve the signal-to-noise ratio of the driving circuit under the premise of ensuring that the driving circuit is quickly established. Therefore, the driving circuit 100 provided in the embodiment of the present application can simultaneously meet the requirements of low power consumption and high signal-to-noise ratio.

[0039] In some embodiments, the driving switch module 110 may include a switch tube 111, such as a field effect tube, a triode or a thyristor, etc., which may be selected according to actual needs and is not limited in this application. As an example, the switch tube may be a MOS tube.

[0040] In some embodiments, Figure 3 As shown, the driving switch module 110 may further include a load 112, which is connected between one end of the switch tube 111 and the ground. By adjusting the size of the load 112, the preset threshold of the driving current of the driving circuit 100 can be adjusted. Optionally, the load 112 may be a resistor, a capacitor, a transistor, etc., which may be selected according to actual needs, and the present application does not limit this. As an example, the load 112 may be a resistor, which may be a fixed resistor or a variable resistor.

[0041] In some implementations, a control switch may be provided to control the on / off state of the first operational amplifier circuit 120. Figure 1 and Figure 4 As shown, the first operational amplifier circuit 120 includes a first operational amplifier 121 and a first switch 122. One input terminal of the first operational amplifier 121 is connected to the feedback node a3, and the other terminal of the first operational amplifier 121 is used to receive the reference voltage V ref The first end of the first switch 122 is connected to the output end of the first operational amplifier 121, and the second end of the first switch 122 is connected to the control end a4 of the driving switch module 110. The first switch 122 is controlled to be closed or opened to connect or disconnect the path between the first operational amplifier circuit 120 and the driving switch module 110. Specifically, when the driving current is less than a preset threshold, the first switch 122 is controlled to be closed to connect the path between the first operational amplifier circuit 120 and the driving switch module 110. When the driving current is greater than or equal to the preset threshold, the first switch 122 is controlled to be opened to disconnect the path between the first operational amplifier circuit 120 and the driving switch module 110.

[0042] In some embodiments, Figure 1 and Figure 5 As shown, the second operational amplifier circuit 130 includes a second operational amplifier 131, one input terminal of the second operational amplifier 131 is connected to the feedback node a3, and the other input terminal of the second operational amplifier 131 is used to receive the reference voltage V ref The output terminal of the second operational amplifier 131 is connected to the control terminal a4 of the driving switch module 110. When the driving circuit 100 is working, the second operational amplifier 131 is connected to the driving switch module 110 to establish a driving circuit and form a driving current.

[0043] In some implementations, a control switch may be provided to control the on / off state of the second operational amplifier circuit 130. Figure 1 and Figure 5 As shown, the second operational amplifier circuit 130 may further include a second switch 132. A first end of the second switch 132 is connected to the output end of the second operational amplifier 131, and a second end of the second switch 132 is connected to the control end of the driving switch module 110. When the driving circuit 100 is working, the second switch 132 connects the path between the output end of the second operational amplifier 131 and the driving switch module 110 to establish a driving circuit and form a driving current.

[0044] In some implementations, the area of ​​the first operational amplifier is smaller than that of the second operational amplifier to ensure that the bandwidth of the first operational amplifier circuit 120 is greater than that of the second operational amplifier circuit. At the same time, since the larger the area of ​​the operational amplifier, the smaller the noise, the noise of the second operational amplifier circuit 130 is smaller than that of the second operational amplifier circuit.

[0045] In other implementations, the on / off state of the first operational amplifier circuit 120 may also be controlled by controlling the enable switch of the operational amplifier. Figure 6 As shown, the first operational amplifier circuit 120 may include a third operational amplifier 123. The third operational amplifier 123 includes a first amplifying unit 1231 and a first enabling switch 1232. One input end of the first amplifying unit 1231 is connected to the negative feedback node a3, and the other input end of the first amplifying unit 1231 is used to receive a reference voltage V ref, the output end of the first amplifying unit 1231 is connected to the control end a4 of the driving switch module 110. The first enabling switch 1232 is connected to the enabling end of the first amplifying unit 1231. By controlling the first enabling switch 1232, the working state of the first amplifying unit 1231 can be controlled. When the driving current of the driving circuit 100 is less than the preset threshold value, the first enabling switch 1232 is controlled to enable the first amplifying unit 1231 to work normally, thereby connecting the path between the first operational amplifier circuit 120 and the driving switch module 110. When the driving current of the driving circuit 100 is greater than or equal to the preset threshold value, the first enabling switch 1232 is controlled to stop enabling the first amplifying unit 1231, and the first amplifying unit 1231 stops working, thereby disconnecting the path between the first operational amplifier circuit 120 and the driving switch module 110.

[0046] In some other implementations, the second operational amplifier circuit 130 includes a fourth operational amplifier 133. Figure 7 As shown, the fourth operational amplifier 133 includes: a second amplifying unit 1331 and a second enabling switch 1332. One input end of the second amplifying unit 1331 is connected to the feedback node a3, and the other input end of the second amplifying unit 1331 is used to receive the reference voltage V ref , the output end of the second amplifying unit 1331 is connected to the control end a4 of the driving switch module 110. The second enabling switch 1332 is connected to the enabling end of the second amplifying unit 1331. By controlling the second enabling switch 1332, the working state of the second amplifying unit 1331 can be controlled. When the driving circuit 100 is working, the second switch unit 1332 is controlled to enable the second amplifying unit 1331 to work normally, thereby connecting the path between the second operational amplifier circuit 130 and the driving switch module 110 to establish a driving circuit and form a driving current.

[0047] In some embodiments, the driving circuit 100 may further include a timing control circuit, which is connected to the first operational amplifier circuit 120. The timing control circuit is used to generate a timing control signal, which is used to control the path between the first operational amplifier circuit 120 and the driving switch module 110 to be disconnected when the driving current of the driving circuit 100 is greater than or equal to the preset threshold value, that is, the timing control circuit outputs a corresponding timing control signal so that when the driving current of the driving circuit 100 is greater than or equal to the preset threshold value, the path between the first operational amplifier circuit 120 and the driving switch module 110 is disconnected. For example, when the timing control signal is at a high level, the timing control signal controls the path between the first operational amplifier circuit 120 and the driving switch module 130 to be connected; when the timing control signal is at a low level, the timing control signal controls the path between the first operational amplifier circuit 120 and the driving switch module 110 to be disconnected. When the driving current of the driving circuit 100 is less than the preset threshold value, the timing control circuit generates a high-level timing control signal to connect the path between the first operational amplifier circuit 120 and the driving switch module 110. When the driving current of the driving circuit 100 is greater than or equal to a preset threshold, the timing control circuit generates a low-level timing control signal to disconnect the path between the first operational amplifier circuit 120 and the driving switch module 110 .

[0048] Optionally, the timing control circuit may include a comparator, the first input terminal of the comparator may input the driving current of the driving circuit, the second input terminal of the comparator may input the reference current, and the value of the reference current may be set to a preset threshold. The comparator may output a timing control signal at the output terminal of the comparator according to the magnitude of the driving current. For example, when the value of the driving current is greater than or equal to the preset threshold, the comparator outputs a high-level timing control signal; when the value of the driving current is less than the preset threshold, the comparator outputs a low-level timing control signal.

[0049] In some other implementations, the timing control circuit may further include a first timing control module and a second timing control module.

[0050] The first timing control module is connected to the first operational amplifier circuit 120. The first timing control module is used to generate a first timing control signal, and the first timing control signal is used to control the path between the first operational amplifier circuit 120 and the driving switch module 110 to be disconnected when the driving current of the driving circuit 100 is greater than or equal to a preset threshold. The first timing control signal is also used to control the path between the first operational amplifier circuit 120 and the driving switch module 110 to be connected when the driving current of the driving circuit 100 is less than a preset threshold.

[0051] The second timing control module is connected to the second operational amplifier circuit 130. The second timing control module is used to generate a second timing control signal, and the second timing control signal is used to control the path connection between the second operational amplifier circuit 130 and the driving switch module 110 when the driving circuit 100 is working.

[0052] Figure 8 A schematic diagram of the structure of the driving circuit 100 provided in an embodiment of the present application is shown. Figure 8 As shown, the driving switch module 110 is connected to the light emitting module 200, and the light emitting module 200 may be, but is not limited to, a light emitting diode. When the driving switch module 110 is turned on, the light emitting module 200 is driven to emit light.

[0053] In this embodiment, the driving switch module 110 includes a switch tube 111 and a load resistor 112, and the connection node between the switch tube 111 and the load resistor 112 is a feedback node a3. The switch tube 111 can be an NMOS tube. When the gate of the NMOS tube is at a high level, the NMOS tube is turned on, thereby outputting a driving current to drive the light emitting module 200. The first operational amplifier circuit 120 includes a first operational amplifier 121 and a first switch 122. The positive input terminal of the first operational amplifier receives a reference voltage V ref The negative input terminal of the first operational amplifier 121 is connected to the feedback node a3. The first terminal of the first switch 122 is connected to the output terminal of the first operational amplifier 121, and the second terminal of the first switch 122 is connected to the control terminal of the switch tube 111.

[0054] The second operational amplifier circuit 130 includes a second operational amplifier 131 and a second switch 132. The positive input terminal of the second operational amplifier 131 receives a reference voltage V ref The negative input terminal of the second operational amplifier 131 is connected to the feedback node a3. The first terminal of the second switch 132 is connected to the output terminal of the second operational amplifier 131, and the second terminal of the second switch 132 is connected to the control terminal of the switch tube 111.

[0055] In the embodiment of the present application, the preset threshold value I of the driving current 驱动电流 It can be obtained by the following formula (1):

[0056]

[0057] Where R is the resistance of the load resistor; V ref is the voltage value of the reference voltage.

[0058] When the driving current of the driving circuit 100 is less than the preset threshold, the first switch 122 and the second switch 132 are controlled to be closed to connect the path between the first operational amplifier circuit 120 and the driving switch module 110, and to connect the path between the second operational amplifier circuit 130 and the driving switch module 110. At this time, the driving circuit can quickly establish the loop current through the first loop associated with the first operational amplifier circuit 120, thereby reducing the establishment time of the driving circuit and reducing the power consumption of the driving circuit. When the driving current of the driving circuit 100 is greater than or equal to the preset threshold, the first switch is controlled to be disconnected and the second switch is controlled to be closed to disconnect the path between the first operational amplifier circuit 130 and the driving switch module 110 and to connect the path between the second operational amplifier circuit 130 and the driving switch module 110. Since the loop bandwidth is proportional to the noise, after the driving current reaches the preset threshold, the path between the first operational amplifier circuit 120 and the driving switch module 110 is disconnected, that is, the first loop with larger noise is disconnected, so that the noise of the driving circuit 100 can be effectively reduced, that is, the signal-to-noise ratio of the driving circuit 100 is effectively improved. Therefore, the driving circuit 100 according to the embodiment of the present application can meet the requirements of low power consumption and high signal-to-noise ratio at the same time.

[0059] Reference Fig. 9 As shown, Fig. 9 An integrated circuit 300 provided in an embodiment of the present application is shown, and the integrated circuit 300 includes the above-mentioned driving circuit 100. In the embodiment of the present application, the integrated circuit 300 may be, but is not limited to, a driving chip.

[0060] Reference Fig.10 As shown, Fig.10 An electronic device 400 provided by an embodiment of the present application is shown, and the electronic device 400 includes a device body 410 and the above-mentioned driving circuit 100. The driving circuit 100 is disposed in the device body 410. As an example, the driving circuit can be integrated in a chip and disposed in the device body 410.

[0061] In some embodiments, the electronic device 400 includes a light emitting module 200, which is disposed in the device body 410 and connected to the driving circuit 100. Optionally, the light emitting module 200 can be integrated into a chip together with the driving circuit, or can be disposed outside the chip.

[0062] In some embodiments, the electronic device 400 further includes a photoelectric sensor 420, and the photoelectric sensor 420 is disposed in the device body 410. Optionally, the photoelectric sensor 420 may be integrated into a chip together with the driving circuit, or may be disposed outside the chip.

[0063] In an embodiment of the present application, the driving circuit 100 drives the light emitting module 200 to emit light, and the light irradiates the skin surface of the wearer, passes through the skin tissue, and then reflects. Since the light will be attenuated to a certain extent when passing through the skin tissue, the absorption of light by muscles, bones, veins and other connecting tissues remains unchanged, but the absorption of light by arteries will change to a certain extent due to the flow of blood. The reflected light is received by the photoelectric sensor 420, and the photoelectric sensor 420 converts the reflected light into an electrical signal. The electrical signal can be further divided into a DC signal and an AC signal. By extracting the AC signal from the electrical signal, the characteristics of blood flow can be further analyzed to obtain information such as human breathing and heart rate.

[0064] In this embodiment, the electronic device 400 can be, but is not limited to, a wearable device (for example, a head-mounted device (HMD) such as electronic glasses, electronic clothes, electronic bracelets, electronic necklaces, electronic tattoos, or smart watches), a mobile phone or a smart phone (for example, an iPhone TM-based phone, an Android TM-based phone), a portable gaming device (for example, a Nintendo DS TM, a PlayStation Portable TM, a Gameboy Advance TM, an iPhone TM), a laptop, a PDA (Personal Digital Assistant), a portable Internet device, a music player, and a data storage device, etc.

[0065] The electronic device 400 can also be any one of a plurality of electronic devices 400, including but not limited to cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transportation instruments, calculators, programmable remote controls, pagers, laptop computers, desktop computers, printers, netbook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), Moving Picture Experts Group (MPEG-1 or MPEG-2) Audio Layer 3 (MP3) players, portable medical devices, and digital cameras and combinations thereof.

[0066] Reference Fig.11 As shown, an embodiment of the present application provides a driving circuit control method 500, which is applied to the driving circuit 100 described in the above embodiment. The driving circuit control method 500 includes: steps 510 to 520.

[0067] Step 510: Obtain the driving current of the driving circuit.

[0068] Step 520: When the driving current is greater than or equal to a preset threshold, disconnect the path between the first operational amplifier circuit and the driving switch module.

[0069] In some embodiments, the driving circuit may further include a timing control circuit, which is connected to the first operational amplifier circuit. Step 520 may include: when the driving current is greater than or equal to a preset threshold, the timing control circuit generates a timing control signal, and disconnects the path between the first operational amplifier circuit and the driving switch module through the timing control signal.

[0070] In summary, the present application provides a driving circuit, an integrated circuit, and an electronic device, wherein the driving circuit includes: a first end of a driving switch module is connected to a light-emitting module, a second end of the driving switch module is grounded, and a feedback node is provided between the first end and the second end of the driving switch module. The input end of the first operational amplifier circuit is connected to the feedback node, and the output end of the first operational amplifier circuit is connected to the control end of the driving switch module. The input end of the second operational amplifier circuit is connected to the feedback node, and the output end of the second operational amplifier circuit is connected to the control end of the driving switch module. Wherein, the bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold value, the path between the first operational amplifier circuit and the driving switch module is disconnected. In this way, the driving circuit is quickly established by the first operational amplifier circuit and the second operational amplifier circuit, the establishment time of the driving circuit is reduced, and after the driving circuit is established, the first operational amplifier circuit is disconnected to reduce the noise of the driving circuit, thereby ensuring that the driving circuit meets both low power consumption and high signal-to-noise ratio.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving circuit, characterized in that: Used to drive the light emitting module, the driving circuit includes: A driving switch module, wherein a first end of the driving switch module is connected to the light emitting module, a second end of the driving switch module is grounded, and a feedback node is provided between the first end and the second end of the driving switch module; a first operational amplifier circuit, wherein an input end of the first operational amplifier circuit is connected to the feedback node, and an output end of the first operational amplifier circuit is connected to a control end of the driving switch module; and a second operational amplifier circuit, wherein an input end of the second operational amplifier circuit is connected to the feedback node, and an output end of the second operational amplifier circuit is connected to a control end of the driving switch module; Wherein, the bandwidth of the first operational amplifier circuit is greater than the bandwidth of the second operational amplifier circuit, and when the driving current of the driving circuit is greater than or equal to a preset threshold, the path between the first operational amplifier circuit and the driving switch module is disconnected.

2. The driving circuit according to claim 1, characterized in that: The first operational amplifier circuit comprises: a first operational amplifier, wherein one input terminal of the first operational amplifier is connected to the feedback node, and another input terminal of the first operational amplifier is used to receive a reference voltage; and A first switch, wherein a first end of the first switch is connected to an output end of the first operational amplifier, and a second end of the first switch is connected to a control end of the driving switch module; the first switch is used to disconnect the path between the first operational amplifier circuit and the driving switch module when the driving current is greater than or equal to a preset threshold.

3. The driving circuit according to claim 1, characterized in that: The second operational amplifier circuit includes a second operational amplifier, one input end of the second operational amplifier is connected to the feedback node, and the other input end of the second operational amplifier is used to receive a reference voltage; the output end of the second operational amplifier is connected to the control end of the driving switch module.

4. The driving circuit according to claim 3, characterized in that: The second operational amplifier circuit also includes a second switch, a first end of the second switch is connected to the output end of the second operational amplifier, and a second end of the second switch is connected to the control end of the driving switch module; the second switch is used to conduct the path between the output end of the second operational amplifier and the driving switch module when the driving circuit is working.

5. The driving circuit according to claim 1, characterized in that: The first operational amplifier circuit includes a third operational amplifier, and the third operational amplifier includes: a first amplifying unit, wherein one input end of the first amplifying unit is connected to the feedback node, and the other input end of the first amplifying unit is used to receive a reference voltage; and an output end of the first amplifying unit is connected to the control end of the driving switch module; and A first enabling switch is connected to an enabling terminal of the first amplifying unit and is used to stop enabling the first amplifying unit when the driving current is greater than or equal to a preset threshold.

6. The driving circuit according to any one of claims 1 to 5, characterized in that: The driving circuit further includes a timing control circuit, and the timing control circuit is connected to the first operational amplifier circuit; The timing control circuit is used to generate a timing control signal, and the timing control signal is used to control the path between the first operational amplifier circuit and the driving switch module to be disconnected when the driving current of the driving circuit is greater than or equal to a preset threshold.

7. An integrated circuit, characterized in that: The driving circuit comprises the driving circuit according to any one of claims 1 to 6.

8. An electronic device, characterized in that: The device comprises a device body and a driving circuit as claimed in any one of claims 1 to 6 arranged in the device body.

9. The electronic device according to claim 8, characterized in that: The electronic device comprises a light emitting module, which is arranged on the device body and connected to the driving circuit.

10. The electronic device according to claim 8, characterized in that: The electronic device further includes a photoelectric sensor, which is disposed on the device body.

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