Light supplement lamp control circuit and electronic equipment

Abstract

The utility model discloses a light supplement lamp control circuit and electronic equipment, and belongs to the technical field of electronic circuits. The pulse width adjusting circuit expands the pulse width of the frame synchronization signal so as to output a control signal; the driving circuit outputs a driving signal according to the control signal to drive the light supplement lamp to emit light; the time delay circuit is used for delaying the frame synchronization signal so as to output an exposure signal; wherein the exposure signal is used for controlling exposure of the image sensor; therefore, under the condition that a controller unit does not need to be additionally configured, it is guaranteed that the light supplementing lamp is controlled to be turned on before exposure of the image sensor and turned off after exposure of the image sensor is finished, and extra power consumption and temperature rise are avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic circuits, and particularly relates to a light supplementing lamp control circuit and an electronic device. BACKGROUND

[0002] In some low-illumination environments, such as when an automated guided vehicle (AGV) code scanner captures a code, the code scanner device needs to capture the code under the AGV body. However, in a low-illumination environment, the image sensor in the code scanner device cannot quickly image due to insufficient light. In order to enable the code scanner device to quickly image in a low-illumination environment, a light supplementing lamp is generally used for synchronous exposure to illuminate the imaging area of the code scanner device.

[0003] In related light supplementing lamp control circuits, there are generally three light supplementing modes synchronized with exposure: constant light, direct connection of a synchronization signal, and generation by a controller. The constant light mode is that the light supplementing lamp is always on during imaging of the code scanner device. The direct connection of the synchronization signal mode is that a frame synchronization signal directly controls turning on and off of the light supplementing lamp. The generation by the controller mode is that an additional controller is used to generate a light supplementing control signal synchronized with the frame synchronization signal, the light supplementing lamp is turned on before the image sensor is exposed, and the light supplementing lamp is turned off after the image sensor ends exposure, and the light supplementing control signal can realize PWM dimming.

[0004] The constant light mode has problems of additional power consumption and temperature rise. The direct connection of the synchronization signal mode has a problem that the light supplementing lamp is turned on slower than the image sensor is exposed. The generation by the controller mode additionally introduces a controller unit, which causes hardware design to be complex, material cost and software development work to increase.

[0005] Therefore, the related light supplementing lamp control circuit has defects of additional power consumption and temperature rise, cannot guarantee that the light supplementing lamp is turned on before the image sensor is exposed and turned off after the image sensor ends exposure, and needs to additionally configure a controller unit. INNOVATION CONTENT

[0006] The application aims to provide a light supplementing lamp control circuit and an electronic device, and aims to solve the problems of the related light supplementing lamp control circuit having additional power consumption and temperature rise, being unable to guarantee that the light supplementing lamp is turned on before the image sensor is exposed and turned off after the image sensor ends exposure, and needing to additionally configure a controller unit.

[0007] The application embodiment provides a light supplementing lamp control circuit, which comprises:

[0008] a control circuit, configured to output a frame synchronization signal;

[0009] A pulse width adjusting circuit is connected with the control circuit, and is configured to expand a pulse width of the frame synchronization signal to output a control signal;

[0010] A driving circuit is connected with the pulse width adjusting circuit, and is configured to output a driving signal according to the control signal to drive the fill light to emit light;

[0011] A delay circuit is connected with the control circuit, and is configured to delay the frame synchronization signal to output an exposure signal;

[0012] The exposure signal is configured to control an image sensor to expose.

[0013] In one of the embodiments, the fill light control circuit further comprises:

[0014] A level conversion circuit is connected with the driving circuit and the pulse width adjusting circuit, and is configured to perform level conversion on the control signal;

[0015] The driving circuit is specifically configured to output the driving signal according to the level-converted control signal to drive the fill light to emit light.

[0016] In one of the embodiments, the fill light control circuit further comprises:

[0017] A high-pass filter circuit is connected with the driving circuit and the pulse width adjusting circuit, and is configured to perform high-pass filtering on the control signal;

[0018] The driving circuit is specifically configured to output the driving signal according to the high-pass filtered control signal to drive the fill light to emit light.

[0019] In one of the embodiments, the high-pass filter circuit comprises a first capacitor, a first diode and a first resistor;

[0020] A first end of the first capacitor constitutes an input end of the high-pass filter circuit, and is connected with the pulse width adjusting circuit to access the control signal;

[0021] A second end of the first capacitor, a negative electrode of the first diode and a first end of the first resistor are connected and jointly constitute an output end of the high-pass filter circuit, and are connected with the driving circuit to output the high-pass filtered control signal;

[0022] A positive electrode of the first diode and a second end of the first resistor are commonly connected to a power supply ground.

[0023] In one of the embodiments, the control circuit is specifically configured to output the frame synchronization signal and a PWM signal;

[0024] The fill light control circuit further comprises:

[0025] And gate circuit, connected with the drive circuit, the control circuit and the pulse width adjustment circuit, for and operation of the control signal and the PWM signal, to output the control signal after operation;

[0026] The drive circuit is specifically configured to output the drive signal according to the control signal after operation, so as to drive the light supplement lamp to emit light.

[0027] In one embodiment, the and gate circuit includes a first transistor and a second resistor;

[0028] The collector of the first transistor constitutes the first input end of the and gate circuit and the output end of the and gate circuit, and is connected with the drive circuit and the pulse width adjustment circuit to access the control signal and output the control signal after operation;

[0029] The first end of the second resistor constitutes the second input end of the and gate circuit, and is connected with the control circuit to access the PWM signal;

[0030] The second end of the second resistor is connected with the base of the first transistor, and the emitter of the first transistor is connected with the power supply ground.

[0031] In one embodiment, the delay circuit includes a first Schmitt trigger, a second capacitor and a third resistor;

[0032] The first end of the third resistor constitutes the input end of the delay circuit, and is connected with the control circuit and the pulse width adjustment circuit to access the frame synchronization signal;

[0033] The output end of the first Schmitt trigger constitutes the output end of the delay circuit, and is connected with the image sensing circuit to output the frame synchronization signal after delay;

[0034] The input end of the first Schmitt trigger is connected with the second end of the third resistor and the first end of the second capacitor, and the second end of the second capacitor is connected with the power supply ground.

[0035] In one embodiment, the pulse width adjustment circuit includes a second Schmitt trigger, a second diode, a third capacitor and a fourth resistor;

[0036] The anode of the second diode and the first end of the fourth resistor are connected and jointly constitute the input end of the pulse width adjustment circuit, and are connected with the control circuit and the delay circuit to access the frame synchronization signal;

[0037] The output end of the second Schmitt trigger constitutes the output end of the pulse width adjustment circuit, and is connected with the drive circuit to output the control signal;

[0038] The input end of the second Schmitt trigger is connected with the first end of the third capacitor, the negative electrode of the second diode and the second end of the fourth resistor, and the second end of the third capacitor is connected with the power supply ground.

[0039] In one of the embodiments, the control circuit comprises a microprocessor;

[0040] The first general input and output end of the microprocessor constitutes the first output end of the control circuit, and is connected with the pulse width adjusting circuit and the delay circuit to output the frame synchronization signal.

[0041] The second general input and output end of the microprocessor constitutes the second output end of the control circuit, and is connected with the AND gate circuit to output the PWM signal.

[0042] The embodiment of the utility model further provides an electronic equipment, the electronic equipment includes the light supplementing lamp control circuit.

[0043] The embodiment of the utility model compared with prior art has the beneficial effect that: because the control signal expands the pulse width of the frame synchronization signal, the exposure signal is generated after the frame synchronization signal is delayed, so the time period of the exposure signal is in the time period of the control signal (i.e. the time period of the driving signal), so without additional configuration of the controller unit, it is guaranteed that the light supplementing lamp is turned on before the image sensor is exposed, and the light supplementing lamp is turned off after the image sensor ends exposure, and there is no additional power consumption and temperature rise. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical utility model in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0045] Figure 1 A structural schematic diagram of the light supplementing lamp control circuit provided by an embodiment of the application is shown in the figure.

[0046] Figure 2 Another structural schematic diagram of the light supplementing lamp control circuit provided by an embodiment of the application is shown in the figure.

[0047] Figure 3 Another structural schematic diagram of the light supplementing lamp control circuit provided by an embodiment of the application is shown in the figure.

[0048] Figure 4 Another structural schematic diagram of the light supplementing lamp control circuit provided by an embodiment of the application is shown in the figure.

[0049] Figure 5 Part of the circuit schematic diagram of the light supplement lamp control circuit provided by an embodiment of the present application is shown in the following figure:

[0050] Figure 6 The waveform diagram of each signal in the light supplement lamp control circuit provided by an embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0053] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0055] Figure 1 The structure schematic diagram of the light supplement lamp control circuit provided by the preferred embodiment of the present application is shown in the following figure, only the part related to the present embodiment is shown for the convenience of description, and the details are as follows:

[0056] The above light supplement lamp control circuit is connected with the light supplement lamp 90, and includes a control circuit 01, a pulse width adjusting circuit 02, a driving circuit 03 and a delay circuit 04.

[0057] The control circuit 01 is used for outputting a frame synchronization signal.

[0058] The pulse width adjusting circuit 02 is connected with the control circuit 01, and is used for expanding the pulse width of the frame synchronization signal to output a control signal.

[0059] The driving circuit 03 is connected with the pulse width adjusting circuit 02, and is used for outputting a driving signal according to the control signal to drive the fill light 90 to emit light.

[0060] The delay circuit 04 is connected with the control circuit 01, and is used for delaying the frame synchronization signal to output an exposure signal.

[0061] The exposure signal is used for controlling the exposure of the image sensor 80.

[0062] It should be noted that the pulse width adjusting circuit 02 is specifically used for delaying the falling edge of the frame synchronization signal by a first time length to output the control signal; the delay circuit 04 is specifically used for delaying the frame synchronization signal by a second time length to output the exposure signal; and the first time length is greater than or equal to the second time length.

[0063] Since the control signal expands the pulse width of the frame synchronization signal, and the exposure signal is generated by delaying the frame synchronization signal, the time period of the exposure signal is within the time period of the control signal (i.e., the time period of the driving signal), so that the fill light 90 is turned on before the image sensor 80 is exposed, and the fill light 90 is turned off after the image sensor 80 ends exposure without additional power consumption and temperature rise.

[0064] As shown in Figure 2 The fill light control circuit further includes a level conversion circuit 05.

[0065] The level conversion circuit 05 is connected with the driving circuit 03 and the pulse width adjusting circuit 02, and is used for performing level conversion on the control signal.

[0066] The driving circuit 03 is specifically used for outputting the driving signal according to the level-converted control signal to drive the fill light 90 to emit light.

[0067] Through the above technical solution, the level matching between the pulse width adjusting circuit 02 and the driving circuit 03 is realized, so that the driving of the high-power fill light 90 is realized.

[0068] As shown in Figure 3 The fill light control circuit further includes a high-pass filter circuit 06.

[0069] The high-pass filter circuit 06 is connected with the driving circuit 03 and the pulse width adjusting circuit 02, and is used for performing high-pass filtering on the control signal.

[0070] The driving circuit 03 is specifically used for outputting the driving signal according to the high-pass filtered control signal to drive the fill light 90 to emit light.

[0071] It can be understood that, in the case of software failure, if the port of the control circuit 01 outputting the frame synchronization signal is always high, the fill light 90 will be long bright, by setting the high-pass filter circuit 06, only the control signal with small pulse width can pass, limiting the maximum single lighting time of the fill light, reducing the possibility of long bright of the fill light 90 caused by software failure, avoiding the damage of optical structure such as lamp beads, light uniforming sheet and polarizing sheet caused by software crash.

[0072] As shown in Figure 4 The control circuit 01 is specifically used for outputting a frame synchronization signal and a pulse width modulation (PWM) signal.

[0073] The AND gate circuit 07 is connected with the driving circuit 03, the control circuit 01 and the pulse width adjusting circuit 02, and is used for performing AND operation on the control signal and the PWM signal to output the operated control signal.

[0074] The driving circuit 03 is specifically used for outputting a driving signal according to the operated control signal to drive the fill light 90 to emit light.

[0075] It can be understood that the duty cycle of the operated control signal can be adjusted by adjusting the duty cycle of the PWM signal.

[0076] Through the above technical scheme, the brightness of the fill light 90 in each synchronous exposure can be adjusted, the flexibility of the fill light control circuit is improved, and the function of the product is enriched.

[0077] Figure 5 A part of the circuit structure of the fill light control circuit is shown, only the part related to the embodiment of the utility model is shown for the convenience of description, and the details are as follows:

[0078] The high-pass filter circuit 06 includes a first capacitor C1, a first diode D1 and a first resistor R1.

[0079] The first end of the first capacitor C1 constitutes the input end of the high-pass filter circuit 06 and is connected with the pulse width adjusting circuit 02 to input the control signal; the second end of the first capacitor C1, the negative pole of the first diode D1 and the first end of the first resistor R1 are connected and jointly constitute the output end of the high-pass filter circuit 06, which is connected with the driving circuit 03 to output the high-pass filtered control signal; the positive pole of the first diode D1 and the second end of the first resistor R1 are commonly connected to the power supply ground.

[0080] The above high-pass filter circuit 06 has simple hardware structure and reliable performance.

[0081] The AND gate circuit 07 includes a first triode Q1 and a second resistor R2.

[0082] The collector of the first transistor Q1 constitutes a first input end of the AND gate 07 and an output end of the AND gate 07, and is connected with the driving circuit 03 and the pulse width adjusting circuit 02 to input a control signal and output an operated control signal; the first end of the second resistor R2 constitutes a second input end of the AND gate 07, and is connected with the control circuit 01 to input a PWM signal; the second end of the second resistor R2 is connected with the base of the first transistor Q1, and the emitter of the first transistor Q1 is connected with the power supply ground.

[0083] The AND gate 07 only includes a transistor and a resistor, and has simple hardware structure and low cost.

[0084] The delay circuit 04 includes a first Schmitt trigger U1, a second capacitor C2 and a third resistor R3.

[0085] The first end of the third resistor R3 constitutes an input end of the delay circuit 04, and is connected with the control circuit 01 and the pulse width adjusting circuit 02 to input a frame synchronization signal; the output end of the first Schmitt trigger U1 constitutes an output end of the delay circuit 04, and is connected with the image sensing circuit to output a delayed frame synchronization signal; the input end of the first Schmitt trigger U1 is connected with the second end of the third resistor R3 and the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the power supply ground.

[0086] The frame synchronization signal is delayed through the second capacitor C2 and the third resistor R3, and the delayed frame synchronization signal is shaped through the first Schmitt trigger U1, so that the obtained exposure signal is a regular square wave, and the reliability of the light supplement lamp control circuit is improved.

[0087] The pulse width adjusting circuit 02 includes a second Schmitt trigger U2, a second diode D2, a third capacitor C3 and a fourth resistor R4.

[0088] The positive pole of the second diode D2 and the first end of the fourth resistor R4 are connected and jointly constitute an input end of the pulse width adjusting circuit 02, and are connected with the control circuit 01 and the delay circuit 04 to input a frame synchronization signal; the output end of the second Schmitt trigger U2 constitutes an output end of the pulse width adjusting circuit 02, and is connected with the driving circuit 03 to output a control signal; the input end of the second Schmitt trigger U2 is connected with the first end of the third capacitor C3, the negative pole of the second diode D2 and the second end of the fourth resistor R4, and the second end of the third capacitor C3 is connected with the power supply ground.

[0089] The second diode D2 is connected in series with the first Schmitt trigger U2, so that the control signal outputted from the output end of the first Schmitt trigger U2 has the same rising edge as the frame synchronization signal, and the charging circuit comprising the fourth resistor R4 and the third capacitor C3 is connected in series with the first Schmitt trigger U2, so that the falling edge of the control signal outputted from the output end of the first Schmitt trigger U2 is delayed relative to the falling edge of the frame synchronization signal, thereby realizing the expansion of the pulse width of the frame synchronization signal to output the control signal.

[0090] The control circuit 01 comprises a microprocessor U1.

[0091] The first general input and output end P1.0 of the microprocessor U1 constitutes the first output end of the control circuit 01, and is connected with the pulse width adjusting circuit 02 and the delay circuit 04 to output the frame synchronization signal; and the second general input and output end P1.1 of the microprocessor U1 constitutes the second output end of the control circuit 01, and is connected with the AND gate circuit 07 to output the PWM signal.

[0092] The control circuit 01 is simple and reliable.

[0093] The working principle of the control circuit 01 will be further described below. Figure 5

[0094] The first general input and output end P1.0 of the microprocessor U1 outputs the frame synchronization signal, the second diode D2 is connected in series with the first Schmitt trigger U2, so that the control signal outputted from the output end of the first Schmitt trigger U2 has the same rising edge as the frame synchronization signal, and the charging circuit comprising the fourth resistor R4 and the third capacitor C3 is connected in series with the first Schmitt trigger U2, so that the falling edge of the control signal outputted from the output end of the first Schmitt trigger U2 is delayed relative to the falling edge of the frame synchronization signal, thereby realizing the expansion of the pulse width of the frame synchronization signal to output the control signal. The first capacitor C1, the first diode D1 and the first resistor R1 perform high-pass filtering on the control signal, and output the high-pass filtered control signal to the collector of the first transistor Q1, the second general input and output end P1.1 of the microprocessor U1 outputs the PWM signal to the base of the first transistor Q1, so that the first transistor Q1 performs AND operation on the control signal and the PWM signal, and sends the operated control signal to the level conversion circuit 05, and the level conversion circuit 05 performs level conversion on the control signal; the driving circuit 03 outputs the driving signal according to the level-converted control signal to drive the light supplementing lamp 90 to emit light. At the same time, the second Schmitt trigger U3, the second capacitor C2 and the third resistor R3 delay the control signal to output the exposure signal, and the image sensor 80 exposes according to the exposure signal.

[0095] The waveform diagram of each signal in the light supplementing lamp control circuit is shown in Figure 6 . ​

[0096] The utility model embodiment further provides an electronic equipment, the amplifier includes above light supplement lamp control circuit.

[0097] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0098] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A supplemental light control circuit, comprising: In connection with the light supplement lamp, comprising: a control circuit, configured to output a frame synchronization signal; a pulse width adjusting circuit, connected with the control circuit, configured to expand the pulse width of the frame synchronization signal to output a control signal; a driving circuit, connected with the pulse width adjusting circuit, configured to output a driving signal according to the control signal to drive the light supplement lamp to emit light; a delay circuit, connected with the control circuit, configured to delay the frame synchronization signal to output an exposure signal; wherein the exposure signal is used to control the exposure of an image sensor.

2. The supplemental light control circuit of claim 1, wherein, Further comprising: a level conversion circuit, connected with the driving circuit and the pulse width adjusting circuit, configured to perform level conversion on the control signal; the driving circuit is specifically configured to output the driving signal according to the level-converted control signal to drive the light supplement lamp to emit light.

3. The supplemental light control circuit of claim 1, wherein, Further comprising: a high-pass filter circuit, connected with the driving circuit and the pulse width adjusting circuit, configured to perform high-pass filtering on the control signal; the driving circuit is specifically configured to output the driving signal according to the high-pass filtered control signal to drive the light supplement lamp to emit light.

4. The supplemental light control circuit of claim 3, wherein, the high-pass filter circuit comprises a first capacitor, a first diode and a first resistor; a first end of the first capacitor constitutes an input end of the high-pass filter circuit, connected with the pulse width adjusting circuit to access the control signal; a second end of the first capacitor, a negative electrode of the first diode and a first end of the first resistor are connected and jointly constitute an output end of the high-pass filter circuit, connected with the driving circuit to output the high-pass filtered control signal; a positive electrode of the first diode and a second end of the first resistor are commonly connected to a power supply ground.

5. The supplemental light control circuit of claim 1, wherein, the control circuit is specifically configured to output the frame synchronization signal and a PWM signal; the light supplement lamp control circuit further comprises: an AND gate circuit, connected with the driving circuit, the control circuit and the pulse width adjusting circuit, configured to perform AND operation on the control signal and the PWM signal to output an operated control signal; the driving circuit is specifically configured to output the driving signal according to the operated control signal to drive the light supplement lamp to emit light.

6. The supplemental light control circuit of claim 5, wherein, the AND gate circuit comprises a first triode and a second resistor; a collector of the first triode constitutes a first input end of the AND gate circuit and an output end of the AND gate circuit, connected with the driving circuit and the pulse width adjusting circuit to access the control signal and output the operated control signal; a first end of the second resistor constitutes a second input end of the AND gate circuit, connected with the control circuit to access the PWM signal; a second end of the second resistor is connected with a base of the first triode, and an emitter of the first triode is connected with a power supply ground.

7. The supplemental light control circuit of claim 1, wherein, the delay circuit comprises a first Schmitt trigger, a second capacitor and a third resistor; a first end of the third resistor constitutes an input end of the delay circuit, connected with the control circuit and the pulse width adjusting circuit to access the frame synchronization signal; an output end of the first Schmitt trigger constitutes an output end of the delay circuit, connected with the image sensor to output the delayed frame synchronization signal; The input end of the first Schmitt trigger is connected with the second end of the third resistor and the first end of the second capacitor, and the second end of the second capacitor is connected with the power supply ground.

8. The supplemental light control circuit of claim 1, wherein, The pulse width adjusting circuit comprises a second Schmitt trigger, a second diode, a third capacitor and a fourth resistor. The anode of the second diode and the first end of the fourth resistor are connected and jointly constitute an input end of the pulse width adjusting circuit, and are connected with the control circuit and the delay circuit to access the frame synchronization signal. The output end of the second Schmitt trigger constitutes an output end of the pulse width adjusting circuit and is connected with the driving circuit to output the control signal. The input end of the second Schmitt trigger is connected with the first end of the third capacitor, the cathode of the second diode and the second end of the fourth resistor, and the second end of the third capacitor is connected with the power supply ground.

9. The supplemental light control circuit of claim 1, wherein, The control circuit comprises a microprocessor. The first general input and output end of the microprocessor constitutes a first output end of the control circuit and is connected with the pulse width adjusting circuit and the delay circuit to output the frame synchronization signal. The second general input and output end of the microprocessor constitutes a second output end of the control circuit and is connected with an AND gate circuit to output a PWM signal.

10. An electronic device, comprising: The electronic device comprises the light supplementing lamp control circuit according to any one of claims 1 to 9.

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