Circuit module and electronic equipment

Abstract

The present application provides a circuit module and an electronic device, the circuit module comprising: a power input end connected to a first input end of a first switch tube, and an output end of the first switch tube connected to a power output end; the power input end is connected to a boost unit input end, and an output end of the boost unit is connected to an energy storage unit input end, and an output end of the energy storage unit is connected to a DC conversion unit input end, and an output end of the DC conversion unit is connected to a first input end of a second switch tube, and an output end of the second switch tube is connected to a power output end; the power input end is connected to a first input end of a comparison unit, and a second input end of the comparison unit is used to input a preset threshold value, and an output end of the comparison unit is respectively connected to a second input end of the first switch tube and a second input end of the second switch tube; when a power supply voltage input to the power input end is greater than a preset threshold value, the power supply voltage is output to the power output end; or, when the power supply voltage is less than or equal to the preset threshold value, the conversion voltage is output to the power output end.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a circuit module and an electronic device. Background Art

[0002] In recent years, with the continuous development of communication technology, human lifestyles have also undergone tremendous changes, but people have never stopped exploring communication technology. In order to ensure the stability and security of information during the communication process, the status monitoring of network equipment is very important. Among them, the power-off alarm circuit is a method for monitoring the status of network equipment. In other words, the power-off alarm circuit monitors the power supply voltage value of the network equipment in real time, and sends an alarm notification to the network management equipment or backup equipment when the power supply of the network equipment begins to fail, thereby maintaining the integrity and reliability of the information.

[0003] At present, the power-off alarm circuit is mainly set inside the network equipment. When the network equipment starts to lose power, the energy storage components (such as energy storage capacitors, energy storage batteries, etc.) on the network equipment are used for power supply, thereby realizing the power-off alarm function. Generally speaking, the power-off retention time of the network equipment is determined by the capacitance of the energy storage components. When the power consumption of the network equipment is very large, in order to ensure the power-off retention time, it is necessary to increase the capacity of the energy storage components, for example, replace the energy storage capacitor with a larger volume or increase the number of energy storage capacitors. This method greatly limits the layout space of the chip. Summary of the invention

[0004] The embodiments of the present application disclose a circuit module and an electronic device.

[0005] In a first aspect, the present application provides a circuit module, including:

[0006] The power input end is connected to the first input end of the first switch tube, and the output end of the first switch tube is connected to the power output end;

[0007] The power input end is connected to the input end of the boost unit, the output end of the boost unit is connected to the input end of the energy storage unit, the output end of the energy storage unit is connected to the input end of the DC conversion unit, the output end of the DC conversion unit is connected to the first input end of the second switch tube, and the output end of the second switch tube is connected to the power output end;

[0008] The power input end is connected to the first input end of the comparison unit, the second input end of the comparison unit is used to input a preset threshold, and the output end of the comparison unit is respectively connected to the second input end of the first switch tube and the second input end of the second switch tube;

[0009] When the power supply voltage input to the comparison unit from the power supply input terminal is greater than a preset threshold value, the first switch tube is turned on, the second switch tube is turned off, the power supply voltage is output to the power supply output terminal through the first switch tube, and the power supply voltage is boosted by the boost unit to obtain a boosted voltage, and the boosted voltage is input to the energy storage unit for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power supply voltage; or

[0010] When the power supply voltage input to the comparison unit at the power supply input end is less than or equal to a preset threshold, the first switch tube is turned off, the second switch tube is turned on, the energy storage unit outputs a backup voltage to the DC conversion unit, the backup voltage is stepped down by the DC conversion unit to obtain a conversion voltage, and the conversion voltage is output to the power supply output end through the second switch tube, wherein the conversion voltage is equal to the power supply voltage.

[0011] In some possible designs, the energy storage unit includes a Zener diode and an energy storage capacitor, the cathode of the Zener diode is respectively connected to the output end of the boost unit and the input end of the DC conversion unit, the anode of the Zener diode is grounded, and the Zener diode is connected in parallel with the energy storage capacitor.

[0012] In some possible designs, the first switch tube includes an inverter and a first metal oxide semiconductor (MOS) tube, the input end of the inverter is connected to the comparison unit, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end, and the output end of the first MOS tube is connected to the power output end; the second switch tube includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit, the input end of the second MOS tube is connected to the output end of the DC conversion unit, and the output end of the second MOS tube is connected to the power output end.

[0013] When the power supply voltage input from the power supply input terminal to the comparison unit is greater than a preset threshold value, the first switch tube is turned on and the second switch tube is turned off, comprising: when the power supply voltage input from the power supply input terminal to the comparison unit is greater than the preset threshold value, the comparison unit outputs a first level signal, the comparison unit outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal obtains a second level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals;

[0014] When the power supply voltage input from the power supply input terminal to the comparison unit is less than or equal to a preset threshold value, the first switch tube is turned off and the second switch tube is turned on, including: when the power supply voltage input from the power supply input terminal to the comparison unit is less than or equal to the preset threshold value, the comparison unit outputs a second level signal, the comparison unit outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned off, and the second level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned on.

[0015] In some possible designs, the comparison unit is further configured to send a second level signal when the power supply voltage input to the comparison unit at the power supply input terminal is less than or equal to a preset threshold.

[0016] In some possible designs, it is characterized in that the above-mentioned circuit module is applied to an optical module, and the boost unit is an avalanche photon diode (APD) boost circuit.

[0017] It can be seen that by using the boost unit inside the circuit module to boost the power supply voltage, and using the boosted high voltage to charge the energy storage unit, the volume of the energy storage capacitor can be reduced without the need to add an additional power boost chip. When the above circuit module is applied to an optical module, a miniaturized design of the optical module can be achieved.

[0018] In a second aspect, the present application provides an electronic device, including an optical module, the optical module including a power input terminal, a power output terminal, a first switch tube, a second switch tube, a comparison unit, a boost unit, an energy storage unit, and a DC conversion unit.

[0019] The power input end is connected to the first input end of the first switch tube, and the output end of the first switch tube is connected to the power output end;

[0020] The power input end is connected to the input end of the boost unit, the output end of the boost unit is connected to the input end of the energy storage unit, the output end of the energy storage unit is connected to the input end of the DC conversion unit, the output end of the DC conversion unit is connected to the first input end of the second switch tube, and the output end of the second switch tube is connected to the power output end;

[0021] The power input end is connected to the first input end of the comparison unit, the second input end of the comparison unit is used to input a preset threshold, and the output end of the comparison unit is respectively connected to the second input end of the first switch tube and the second input end of the second switch tube;

[0022] When the power supply voltage input to the comparison unit from the power supply input terminal is greater than a preset threshold value, the first switch tube is turned on, the second switch tube is turned off, the power supply voltage is output to the power supply output terminal through the first switch tube, and the power supply voltage is boosted by the boost unit to obtain a boosted voltage, and the boosted voltage is input to the energy storage unit for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power supply voltage; or

[0023] When the power supply voltage input to the comparison unit at the power supply input end is less than or equal to a preset threshold, the first switch tube is turned off, the second switch tube is turned on, the energy storage unit outputs a backup voltage to the DC conversion unit, the backup voltage is stepped down by the DC conversion unit to obtain a conversion voltage, and the conversion voltage is output to the power supply output end through the second switch tube, wherein the conversion voltage is equal to the power supply voltage.

[0024] In some possible designs, the energy storage unit includes a Zener diode and an energy storage capacitor, the cathode of the Zener diode is respectively connected to the output end of the boost unit and the input end of the DC conversion unit, the anode of the Zener diode is grounded, and the Zener diode is connected in parallel with the energy storage capacitor.

[0025] In some possible designs, the first switch tube includes an inverter and a first MOS tube, the input end of the inverter is connected to the comparison unit, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end, and the output end of the first MOS tube is connected to the power output end; the second switch tube includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit, the input end of the second MOS tube is connected to the output end of the DC conversion unit, and the output end of the second MOS tube is connected to the power output end.

[0026] When the power supply voltage input from the power supply input terminal to the comparison unit is greater than a preset threshold value, the first switch tube is turned on and the second switch tube is turned off, comprising: when the power supply voltage input from the power supply input terminal to the comparison unit is greater than the preset threshold value, the comparison unit outputs a first level signal, the comparison unit outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal obtains a second level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals;

[0027] When the power supply voltage input from the power supply input terminal to the comparison unit is less than or equal to a preset threshold value, the first switch tube is turned off and the second switch tube is turned on, including: when the power supply voltage input from the power supply input terminal to the comparison unit is less than or equal to the preset threshold value, the comparison unit outputs a second level signal, the comparison unit outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned off, and the second level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned on.

[0028] In some possible designs, the comparison unit is further configured to send a second level signal when a power supply voltage input to the comparison unit from a power supply input terminal is less than or equal to a preset threshold.

[0029] In some possible designs, the boost unit is an APD boost circuit.

[0030] It can be seen that when an optical module is provided in an electronic device, and the high voltage output by the APD boost circuit is used in the optical module to charge the energy storage capacitor, when the power supply voltage of the optical module is powered off, the energy storage capacitor can be used to power the optical module. In the above electronic device, since the high voltage output by the APD boost circuit inside the optical module is used to charge the energy storage capacitor, the capacity of the energy storage capacitor can be reduced without the need to add an additional power boost chip, thereby greatly reducing the volume of the energy storage capacitor, and the volume of the optical module is also reduced accordingly, reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1A This is a possible power-off alarm method provided by this application;

[0033] Figure 1B This is a possible power-off alarm method provided by this application;

[0034] Figure 2 It is a circuit module provided by this application;

[0035] Figure 3 This is a possible power-off alarm circuit provided by the present application;

[0036] Figure 4 is a schematic diagram of the test results provided by this application;

[0037] Figure 5 This is a possible power-off alarm circuit provided by the present application;

[0038] Figure 6 is a possible comparison unit schematic diagram provided by the present application;

[0039] Figure 7 This application provides an electronic device. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the embodiments of the present application, the specific applications of the embodiments of the present application in various application scenarios will be firstly illustrated by examples.

[0041] (1) Take the optical module as an example.

[0042] An optical module is a photoelectric conversion device that is usually installed in optical communication equipment (such as an optical network unit, an optical terminal, etc.) to convert electrical signals in the optical communication equipment into optical signals or convert optical signals received by the optical communication equipment into electrical signals. When an optical module fails, it may affect data transmission and make the services between optical communication equipment unable to operate normally. Among them, power supply failure of the optical module is one of the common failures.

[0043] It should be noted that the power supply failure of the optical module is a failure caused by the power failure of the external power supply of the optical module. When the external power supply of the optical module fails, the optical module still needs to continue to maintain the working state. In other words, the optical module needs to save its current operating state within the power-off retention time and report its power failure. Among them, one possible implementation method is to set a power failure alarm circuit on the power bus of the optical communication equipment (such as the optical network unit (ONU)) equipped with the optical module, that is, to connect one or more energy storage capacitors in parallel between the power input terminal and the ground terminal of the optical communication equipment. The capacity of the energy storage capacitor can be 1mF, 10μF or 150μF, etc. Figure 1A For example, the power supply voltage input to the power input terminal of the optical communication device where the optical module is located is 12V, and the power input terminal of the optical communication device is connected to one end of the energy storage capacitors C1, C2, and C3 respectively. The energy storage capacitors C1, C2, and C3 are connected in parallel, and the other ends of the energy storage capacitors C1, C2, and C3 are grounded. The capacitance of the energy storage capacitors C1, C2, and C3 is 1mF. Another possible implementation method is to set a power failure alarm circuit on the power bus of the optical module, that is, to connect one or more energy storage capacitors in parallel between the power input terminal and the ground terminal of the optical module. Figure 1BFor example, the power supply voltage input to the power input end of the optical module is 3.3V, and the power input end of the optical module is connected to one end of the energy storage capacitors C1, C2, C3, and C4 respectively. The energy storage capacitors C1, C2, C3, and C4 are connected in parallel, and the other ends of the energy storage capacitors C1, C2, C3, and C4 are grounded, and the capacitance of the energy storage capacitors C1, C2, C3, and C4 is 1mF.

[0044] It can be seen that in Figure 1A In the circuit shown, the power supply voltage of the optical communication equipment is used to charge the energy storage capacitors C1, C2, and C3. When the power supply voltage of the optical module is powered off, the energy storage capacitors C1, C2, and C3 are discharged to power the optical module. However, since the energy storage capacitors C1, C2, and C3 are connected between the power input terminal and the ground terminal of the optical communication equipment, the energy storage capacitors C1, C2, and C3 will power other components that are working normally while powering the optical module. In other words, when the energy storage capacitors C1, C2, and C3 are discharged, they power the entire optical communication equipment. Therefore, this method may increase power consumption. By the same token, Figure 1B In the circuit shown, when the power supply voltage of the optical module begins to lose power, the energy storage capacitors C1, C2, C3, and C4 discharge, thereby supplying power to the entire optical module. Figure 1A The circuit shown, Figure 1B The number of energy storage capacitors in the circuit has increased significantly because: Figure 1A The 12V power supply voltage is used to charge the energy storage capacitor, and Figure 1B Only 3.3V power supply voltage is used to charge the energy storage capacitor. According to the law of conservation of charge, Figure 1B The circuit shown requires more energy storage capacitors or energy storage capacitors with larger capacitance to ensure that the optical module can continue to work within the power-off alarm time. Figure 1B The circuit shown, Figure 1A The energy storage capacitor in the circuit supplies power to the entire optical communication device. Figure 1B The energy storage capacitor in the circuit only supplies power to the optical module, so Figure 1A The power consumption is significantly greater than Figure 1B The power consumption in Figure 1A Although the circuit uses a 12V power supply voltage to store energy in the energy storage capacitor, Figure 1A The power consumption is too large, so Figure 1A The number of energy storage capacitors and the capacitance of the energy storage capacitors have not decreased. Although both of the above two methods can realize power-off alarm when the power supply voltage of the optical module is powered off, both of them also have the problem that the capacity of the energy storage capacitor is large and the number of energy storage capacitors is large, thereby increasing the packaging volume of the energy storage capacitor, and the volume of the optical communication equipment or optical module is also increased accordingly, which not only fails to meet the trend of miniaturization of equipment, but also increases the cost of the equipment.

[0045] (2) Take the power storage scenario as an example.

[0046] Similarly, the embodiments of the present application can also be applied to power storage scenarios, for example, power storage of a real-time clock (RTC) chip. RTC is a set of counters that are mainly used to output the actual time, thereby providing an accurate time reference for electronic devices. Usually, a backup battery is provided in the RTC chip. When the main power supply of the RTC chip is powered off, the backup battery can be used to continue to output time for the system. However, when the power in the RTC battery is exhausted, a new RTC battery needs to be replaced. In order to ensure the power supply time of the backup battery, the backup battery is usually large in size, so it occupies a large space of the RTC chip.

[0047] Therefore, in order to solve the above-mentioned problem of increased volume of electronic equipment due to the large volume of energy storage components, the present application provides a circuit module, which can use the high voltage in the circuit to charge the energy storage capacitor, and when the power supply voltage input at the power input end is powered off, the energy storage capacitor is used as a backup power supply, which not only reduces the requirements for the capacity of the energy storage capacitor, but also reduces power consumption, thereby greatly reducing the volume of the energy storage capacitor, so that the space occupied by the energy storage capacitor on the printed circuit board (PCB) of the chip inside the electronic device is also reduced accordingly, further reducing the development cost of the electronic device and meeting the development trend of miniaturization of the device.

[0048] The circuit module provided in this application is described below with reference to specific embodiments.

[0049] like Figure 2 As shown, Figure 2 A circuit module provided by the present application is shown, and the circuit module can be divided into two parts: a backup power circuit module 210 (as shown in a dotted box) and a switch control circuit module 220, wherein the backup circuit module 210 includes a boost unit 211, an energy storage unit 212 and a DC conversion unit 213, and the switch control circuit module 220 includes a power input terminal 221, a power output terminal 222, a first switch tube 223, a second switch tube 224 and a comparison unit 225. The connection relationship of the circuit modules is as follows:

[0050] The power input terminal 221 is connected to the first input terminal of the first switch tube 223, and the output terminal of the first switch tube 223 is connected to the power output terminal 222;

[0051] The power input terminal 221 is connected to the input terminal of the boost unit 211, the output terminal of the boost unit 211 is connected to the input terminal of the energy storage unit 212, the output terminal of the energy storage unit 212 is connected to the input terminal of the DC conversion unit 213, the output terminal of the DC conversion unit 213 is connected to the first input terminal of the second switch tube 224, and the output terminal of the second switch tube 224 is connected to the power output terminal 222;

[0052] The power input terminal 221 is connected to the first input terminal of the comparison unit 225, the second input terminal of the comparison unit 225 is used to input a preset threshold, and the output terminal of the comparison unit 225 is respectively connected to the second input terminal of the first switch tube 223 and the second input terminal of the second switch tube 224;

[0053] When the power voltage input from the power input terminal 221 to the comparison unit 225 is greater than a preset threshold, the first switch tube 223 is turned on, the second switch tube 224 is turned off, the power voltage is output to the power output terminal 222 through the first switch tube 223, and the power voltage is boosted by the boost unit 211 to obtain a boosted voltage, which is input to the energy storage unit 212 for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power voltage; or

[0054] When the power supply voltage input from the power supply input terminal 221 to the comparison unit 225 is less than or equal to a preset threshold, the first switch tube 223 is turned off, the second switch tube 224 is turned on, and the energy storage unit 212 outputs a backup voltage to the DC conversion unit 213. The backup voltage is stepped down by the DC conversion unit 213 to obtain a conversion voltage, and the conversion voltage is output to the power supply output terminal 222 through the second switch tube 224, wherein the conversion voltage is equal to the power supply voltage.

[0055] In a specific embodiment, the energy storage unit 212 includes one or more energy storage components. The energy storage unit 212 can use the boost voltage output by the boost unit 211 to charge the energy storage components, and output a backup voltage when the power supply voltage is less than or equal to a preset threshold.

[0056] In a more specific embodiment, the energy storage unit 212 includes a Zener diode and an energy storage capacitor, the cathode of the Zener diode is respectively connected to the output end of the boost unit 211 and the input end of the DC conversion unit 213, the anode of the Zener diode is grounded, and the Zener diode is connected in parallel with the energy storage capacitor.

[0057] In a specific embodiment, the first switch tube 223 is used to control the power supply voltage to be input to the power supply output terminal 222, and the second switch tube 224 is used to control the standby voltage to be input to the power supply output terminal 222. Specifically, when the power supply voltage is greater than a preset threshold, the first switch tube controls the power supply voltage to flow to the power supply output terminal 222, while the second switch tube controls the standby voltage to be unable to flow to the power supply output terminal 222; when the power supply voltage is less than the preset threshold, the first switch tube controls the power supply voltage to be unable to be output to the power supply output terminal 222, and the second switch tube controls the power supply voltage to be output to the power supply output terminal 222.

[0058] In a more specific embodiment, the first switch tube 223 includes an inverter and a first MOS tube, the input end of the inverter is connected to the comparison unit 225, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end 221, and the output end of the first MOS tube is connected to the power output end 222. The second switch tube 224 includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit 225, the input end of the second MOS tube is connected to the output end of the DC conversion unit 213, and the output end of the second MOS tube is connected to the power output end 222.

[0059] When the power supply voltage input from the power supply input terminal 221 to the comparison unit 225 is greater than a preset threshold value, the comparison unit 225 outputs a first level signal, and the comparison unit 225 outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal is converted into a second level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals;

[0060] When the power supply voltage input from the power supply input terminal 221 to the comparison unit 225 is less than or equal to a preset threshold value, the comparison unit 225 outputs a second level signal, and the comparison unit 225 outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is cut off, and the second level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned on.

[0061] In a specific embodiment, the comparison unit 225 is used to determine whether the power supply voltage is powered off, wherein the comparison unit can be a combination of a comparator and a filter, or can be implemented by a power failure input (Power Fail Input, PFI) detection function of an integrated circuit (Integrated Circuit, IC) chip, etc., which is not specifically limited here.

[0062] In a specific embodiment, the comparison unit 225 is further configured to send a second level signal when the power supply voltage input to the comparison unit 225 from the power supply input terminal 221 is less than or equal to a preset threshold.

[0063] In a specific embodiment, the boost unit 211 is used to boost the power supply voltage to obtain a boost voltage, thereby charging the energy storage components in the energy storage unit. It should be understood that the boost unit 211 is not only used to charge the energy storage components, but also to complete the normal operation of the circuit.

[0064] In a more specific embodiment, it is characterized in that the above-mentioned circuit module is applied to an optical module, and the boost unit 211 is an APD boost circuit, wherein the APD is a photosensitive component used in laser communication, which is used to amplify the photoelectric signal to improve the sensitivity of detection. When a reverse bias is applied to the PN junction of the APD, the incident light will form a photocurrent after being absorbed by the PN junction. When the reverse bias is increased, an "avalanche" phenomenon (i.e., the photocurrent increases exponentially) will occur. Therefore, the APD boost circuit is used to provide a high reverse bias to the APD to increase the photocurrent. It should be understood that the above-mentioned circuit module can also be applied to power storage scenarios inside the chip, for example, the backup power storage of the RTC chip.

[0065] In a specific embodiment, the standby voltage output by the energy storage unit may be greater than the power supply voltage, so the DC conversion unit 313 is used to step down the standby voltage to obtain a conversion voltage, so that when the power supply voltage is powered off, the conversion voltage is used to power the device. The DC conversion unit is a step-down circuit (e.g., a step-down chopper circuit).

[0066] It should be noted that the "connection" mentioned in the above embodiments can be either a direct connection or an indirect connection. In other words, "connection" can refer to the connection between units directly through wires, or the connection between units through one or more components (such as resistors). For example, the output end of the boost unit 211 is connected to the input end of the energy storage unit 212, which can be either the output end of the boost unit 211 is connected to the input end of the energy storage unit 212, or the output end of the boost unit 211 is connected to one end of a current limiting resistor, and the other end of the current limiting resistor is connected to the input end of the energy storage unit 212, wherein the number of current limiting resistors can be one or more, which is not specifically limited here.

[0067] It should be understood that the first switch tube can be a combination of a first MOS tube and a triode, or a combination of a first MOS tube and a transistor-transistor logic (TTL) NOT gate, or a switch triode, etc. Similarly, the second switch tube can be a second MOS tube, or a switch triode, etc., which are not specifically limited here. In addition, the MOS tube can be a P-channel metal oxide semiconductor (Positive Channel Metal Oxide Semiconductor, PMOS) tube, or an N-channel metal oxide semiconductor (Negative Channel Metal Oxide Semiconductor, NMOS) tube, and the triode can be an NPN-type triode, or a PNP-type triode, which are not specifically limited here.

[0068] It should also be understood that the DC conversion unit 213 can be a buck circuit, and the buck circuit can be a buck-type chopper converter, a buck-boost converter (Buck-Boost Converter), a Cuk Converter, etc., which are not specifically limited here. The boost unit can be specifically a boost chopper converter, a single-ended primary inductance converter (Single Ended Primary Inductance Converter, SEPIC) or a flyback converter (Flyback Converter), etc., which are not specifically limited here. In addition, the boost unit 211 needs to be specifically determined according to the specific application scenario. For example, in the optical module, the boost unit is an APD boost circuit.

[0069] In the above circuit module, the power supply voltage is boosted by utilizing the boost unit inside the circuit module, and the boosted high voltage is utilized to charge the energy storage unit, thereby reducing the volume of the energy storage capacitor without the need to add an additional power boost chip. When the above circuit module is applied to an optical module, a miniaturized design of the optical module can be realized. In addition, by using the first switch tube and the second switch tube, it can better adapt to the state of normal power supply and power failure of the power supply voltage, thereby reducing power consumption.

[0070] Combination Figure 2 The circuit modules shown are described below by taking some more specific scenarios as examples.

[0071] like Figure 3 As shown, Figure 3The circuit block diagram of a power-off alarm circuit provided by the present application is shown. The power-off alarm circuit includes a MOS tube Q1, a MOS tube Q2, a transistor Q3, a current limiting resistor R, a voltage stabilizing diode D, a storage capacitor C, a boost circuit, a buck circuit, a comparator, and a filter. Among them, the MOS tube Q1 and the transistor Q3 form a Figure 2 The first switch tube, MOS tube Q2 is Figure 2 The second switch tube, voltage regulator diode D and energy storage capacitor C form Figure 2 The energy storage unit in the boost circuit is Figure 2 The boost unit and the buck chopper circuit are Figure 2 The DC conversion unit, comparator and filter in Figure 2 The comparison unit in .

[0072] In a specific embodiment, assuming that both the MOS transistor Q1 and the MOS transistor Q2 are PMOS transistors, and the transistor Q3 is an NPN transistor, the connection relationship of the power-off alarm circuit is as follows:

[0073] (1) The power input end is connected to the drain of the MOS tube Q1, the source of the MOS tube Q1 is connected to the power output end, the gate of the MOS tube Q1 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the output end of the filter.

[0074] (2) The power input terminal is connected to the first input terminal of the comparator, the second input terminal of the comparator is used to input a preset threshold, and the output terminal of the comparator is connected to the output terminal of the filter.

[0075] (3) The power input end is connected to the input end of the APD boost circuit, the output end of the APD boost circuit is connected to one end of the current limiting resistor R, the other end of the current limiting resistor R is respectively connected to the cathode of the voltage zener diode D and the input end of the buck circuit, the anode of the voltage zener diode D is grounded, the voltage zener diode D is connected in parallel with the energy storage capacitor C, the output end of the buck circuit is connected to the source of the MOS tube Q2, the drain of the MOS tube Q2 is connected to the power output end, and the gate of the MOS tube Q2 is connected to the output end of the filter.

[0076] Below Figure 3 The working process of the power-off alarm circuit is shown in detail.

[0077] Step 1: When the power supply voltage from the power supply input end to the input comparator is greater than a preset threshold value, the comparator outputs a high level, and the high level signal is filtered by a filter to eliminate the jitter of the level signal, thereby obtaining a stable high level signal; the filter outputs the stable high level signal to the MOS tube Q2 and the triode Q3 respectively, wherein when the gate of the MOS tube Q2 receives the high level signal, the MOS tube Q2 is turned off; when the base of the triode Q3 receives the high level signal, the triode Q3 is turned off, the collector of the triode Q3 outputs a low level, and outputs the low level signal to the MOS tube Q1, after the gate of the MOS tube Q1 receives the low level signal, the MOS tube Q1 is turned on, so that the power supply voltage is output to the power output end through the MOS tube Q1. At the same time, the power supply voltage is input into the boost circuit, and the boost voltage can be obtained after the boost circuit boosts the voltage. Since directly using the boost voltage to charge the energy storage capacitor C may break down the energy storage capacitor C, the current limiting resistor R can be used to limit the size of the charging current, and then the voltage regulator diode D is used to stabilize the charging voltage to a fixed voltage, and then the energy storage capacitor C is charged to obtain a standby voltage. After the standby voltage is stepped down by the step-down circuit, a conversion voltage equal to the power supply voltage is obtained. It should be noted that since the MOS tube Q2 is cut off, the conversion voltage cannot be output to the power output terminal.

[0078] Step 2: When the power supply voltage input to the comparator from the power supply input end is less than or equal to the preset threshold, the comparator outputs a low level, and the low level signal can be filtered by the filter to obtain a stable low level signal; the filter outputs the stable low level signal to the MOS tube Q2 and the triode Q3 respectively, wherein when the gate of the MOS tube Q2 receives a low level signal, the MOS tube Q2 is turned on, so that the standby voltage is output to the power supply output end through the MOS tube Q2; when the base of the triode Q3 receives a low level signal, the triode Q3 is turned on, the collector of the triode Q3 outputs a high level, and outputs the high level signal to the MOS tube Q1, and after the gate of the MOS tube Q1 receives a high level signal, the MOS tube Q1 is turned off, so that the power supply voltage input to the power supply input end cannot be output to the power supply output end through the MOS tube Q1. At the same time, since the power supply voltage input to the comparator from the power supply input end is less than or equal to the preset threshold, that is, the power supply voltage input to the power supply input end is powered off, the power supply voltage is less than the driving voltage of the boost circuit, and the boost circuit cannot boost the power supply voltage, so that the energy storage capacitor cannot continue to store energy.

[0079] It should be understood that the above circuit examples are only used for illustrative purposes. In practical applications, the number of MOS tubes and triodes can be one or more; MOS tube Q1 can be a PMOS tube or an NMOS tube; MOS tube Q2 can be a PMOS tube or an NMOS tube; MOS tube Q1 and MOS tube Q2 can be of the same type or of different types; triodes can be NPN triodes or PNP triodes; in addition, other switching components can be used to replace MOS tubes and triodes, which are not specifically limited here. Similarly, the number of other components in the circuit (such as energy storage capacitors, current limiting resistors, etc.) can be one or more, which needs to be determined according to actual conditions and is not specifically limited here.

[0080] In order to facilitate understanding of the power-off alarm effect of the embodiment of the present application, a detailed description will be given below through specific experimental data.

[0081] The test conditions are: Figure 3 The power-off alarm circuit shown is applied to the optical module, and the power supply voltage input to the power input terminal is 3.3V, the resistance of the current limiting resistor R is 18K, the capacitance of the energy storage capacitor C is 150μF, the boost circuit is an APD boost circuit, and the power output terminal is connected to a 1A load. The test results are as follows:

[0082] When the power supply voltage is 3.3V, the boost voltage output by the APD boost circuit is 25-35V, and after passing through the current limiting resistor R, a standby voltage of 11V can be obtained.

[0083] When the power supply voltage starts to drop from time t1, Figure 4 As shown in the figure, the standby voltage starts to drop from 11V, but the voltage outputted by the power supply output terminal is still 3.3V. It is not until time t2 that the voltage outputted by the power supply output terminal starts to drop. It can be obtained that the power-off maintenance time is t2-t1, and it is found through testing that the power-off maintenance time obtained under the above test conditions is 2.1ms, and the circuit can be used in industrial-grade environments (-40℃~85℃).

[0084] like Figure 5 As shown, Figure 5 The circuit block diagram of another power-off alarm circuit provided by the present application is shown. The power-off alarm circuit includes MOS tube Q1, MOS tube Q2, transistor Q3, current limiting resistor R1, voltage stabilizing diode D, energy storage capacitor C, boost circuit, buck circuit, voltage divider resistor R2, voltage divider resistor R3, and IC chip. Among them, MOS tube Q1 and transistor Q3 form Figure 2 The first switch tube, MOS tube Q2 is Figure 2 The second switch tube, voltage regulator diode D and energy storage capacitor C form Figure 2 The energy storage unit in the boost circuit is Figure 2 The boost unit and the buck chopper circuit are Figure 2 The DC conversion unit in the IC chip has a built-in PFI detection function and an internal comparator function (such as Figure 6 As shown), the IC chip can be used to replace Figure 2 The comparison unit in .

[0085] In a specific embodiment, assuming that both the MOS transistor Q1 and the MOS transistor Q2 are PMOS transistors, and the transistor Q3 is an NPN transistor, the connection relationship of the power-off alarm circuit is as follows:

[0086] (1) The power input terminal is connected to the drain of the MOS tube Q1, the source of the MOS tube Q1 is connected to the power output terminal, the gate of the MOS tube Q1 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, and the base of the transistor Q3 is connected to the power failure output (Power Fail Output, PFO) pin of the IC chip.

[0087] (2) The power input terminal is connected to one end of the voltage divider resistor R2, the other end of the voltage divider resistor R2 is respectively connected to the PFI pin of the IC chip and one end of the voltage divider resistor R3, and the other end of the voltage divider resistor R3 is grounded.

[0088] (3) The power input end is connected to the input end of the boost circuit, the output end of the boost circuit is connected to one end of the current limiting resistor R, the other end of the current limiting resistor R is respectively connected to the cathode of the voltage zener diode D and the input end of the voltage-step-down circuit, the anode of the voltage zener diode D is grounded, the voltage zener diode D is connected in parallel with the energy storage capacitor C, the output end of the voltage-step-down circuit is connected to the source of the MOS tube Q2, the drain of the MOS tube Q2 is connected to the power output end, and the gate of the MOS tube Q2 is connected to the output end of the filter.

[0089] Below Figure 5 The working process of the power-off alarm circuit is shown in detail.

[0090] Step 1: When the voltage received by the PFI pin of the IC chip is greater than a preset threshold, the PFO pin of the IC chip outputs a high level, and outputs the high level signal to the MOS tube Q2 and the transistor Q3 respectively, wherein when the gate of the MOS tube Q2 receives a high level signal, the MOS tube Q2 is turned off; when the base of the transistor Q3 receives a high level signal, the transistor Q3 is turned off, the collector of the transistor Q3 outputs a low level, and outputs the low level signal to the MOS tube Q1, and after the gate of the MOS tube Q1 receives a low level signal, the MOS tube Q1 is turned on, so that the power supply voltage input at the power input end is output to the power output end through the MOS tube Q1. At the same time, the power supply voltage inputted from the power supply input terminal is inputted into the boost circuit, and the boost voltage can be obtained after the boost circuit boosts the voltage. Since directly charging the energy storage capacitor C with the boost voltage may break down the energy storage capacitor C, the current limiting resistor R can be used to limit the size of the charging current, and then the voltage stabilizing diode D is used to stabilize the charging voltage to a fixed voltage, and then the energy storage capacitor C is charged to obtain the standby voltage, and the standby voltage is stepped down by the step-down circuit to obtain a conversion voltage equal to the power supply voltage. It should be noted that since the MOS tube Q2 is cut off, the conversion voltage cannot be output to the power supply output terminal.

[0091] Step 2: When the voltage received by the PFI pin of the IC chip is less than or equal to the preset threshold, the PFO pin of the IC chip outputs a low level, and outputs the low level signal to the MOS tube Q2 and the transistor Q3 respectively, wherein when the gate of the MOS tube Q2 receives a low level signal, the MOS tube Q2 is turned on, so that the standby voltage is output to the power output end through the MOS tube Q2; when the base of the transistor Q3 receives a low level signal, the transistor Q3 is turned on, the collector of the transistor Q3 outputs a high level, and outputs the high level signal to the MOS tube Q1, and after the gate of the MOS tube Q1 receives a high level signal, the MOS tube Q1 is turned off, so that the power supply voltage input to the power input end cannot be output to the power output end through the MOS tube Q1. It should be noted that since the voltage received by the PFI pin of the IC chip is less than or equal to the preset threshold, that is, the power supply voltage input to the power input end is powered off, the power supply voltage is less than the driving voltage of the boost circuit, so that the boost circuit cannot boost the power supply voltage, and thus cannot continue to store energy in the energy storage capacitor.

[0092] It should be noted that one end of the comparator inside the IC chip is a constant reference voltage (eg, 1.25V), and the other end is a PFI pin, wherein the voltage received by the PFI pin of the IC chip is the voltage obtained after the power supply voltage passes through the voltage divider resistors R2 and R3.

[0093] It should be understood that the above circuit examples are only used for illustrative purposes. In practical applications, the number of MOS tubes and triodes can be one or more; MOS tube Q1 can be a PMOS tube or an NMOS tube; MOS tube Q2 can be a PMOS tube or an NMOS tube; MOS tube Q1 and MOS tube Q2 can be of the same type or of different types; triodes can be NPN triodes or PNP triodes; in addition, other switching components can be used to replace MOS tubes and triodes, which are not specifically limited here. Similarly, the number of other components in the circuit (such as energy storage capacitors, current limiting resistors, etc.) can be one or more, which needs to be determined according to actual conditions and is not specifically limited here.

[0094] It can be seen that when Figure 3 or Figure 5 When the power-off alarm circuit shown is applied to an optical module, the boost circuit is an APD boost circuit, and the power supply voltage input to the power input terminal can be specifically 3.3V. After being boosted by the APD boost circuit, a high voltage of 25 to 35V can be obtained. At this time, a current limiting resistor with a resistance of 18KΩ can be selected to limit the size of the charging current, so that the charging voltage of the energy storage capacitor is reduced to 11V, and then the zener diode is used to stabilize the charging voltage of 11V, and then the energy storage capacitor is charged to obtain a standby voltage of 11V. Finally, the standby voltage of 11V is stepped down by the step-down circuit to obtain a conversion voltage of 3.3V to supply the optical module to continue working. Since the energy storage capacitor is charged with a high voltage in the implementation mode of the present application, the capacitance requirement of the energy storage capacitor is lower than that of the energy storage capacitor charged with a low voltage. For example, when charging the energy storage capacitor with a low voltage (3.3V), three energy storage capacitors with a capacitance of 1mF may be required, while when charging the energy storage capacitor with a high voltage (25-35V), only one energy storage capacitor with a capacitance of 150μF may be required. In addition, the mF-level energy storage capacitor is a non-solid plug-in aluminum capacitor, while the μF-level energy storage capacitor is a chip capacitor, which is smaller in size than the plug-in capacitor. Therefore, the implementation mode of the present application can greatly reduce the volume of the energy storage capacitor, thereby reducing the volume of the PCB. Similarly, when Figure 3 or Figure 5 When the power failure alarm circuit shown is applied to the power energy storage of the RTC chip, the high voltage (e.g., 12V) in the PCB board where the RTC chip is located can be used to charge the energy storage capacitor, and then the energy storage capacitor is used to provide a backup voltage for the RTC chip, so that the RTC chip can continue to work when the main power supply is powered off. Therefore, the embodiment of the present application can use a small energy storage capacitor to replace a large backup battery, thereby reducing the volume of the RTC chip and the volume of the PCB.

[0095] See also Figure 7 , Figure 7 An electronic device provided by the present application is shown, the electronic device includes an optical module, the optical module includes a power input terminal, a power output terminal, a first switch tube, a second switch tube, a comparison unit, a boost unit, an energy storage unit and a DC conversion unit.

[0096] The power input end is connected to the first input end of the first switch tube, and the output end of the first switch tube is connected to the power output end;

[0097] The power input end is connected to the input end of the boost unit, the output end of the boost unit is connected to the input end of the energy storage unit, the output end of the energy storage unit is connected to the input end of the DC conversion unit, the output end of the DC conversion unit is connected to the first input end of the second switch tube, and the output end of the second switch tube is connected to the power output end;

[0098] The power input end is connected to the first input end of the comparison unit, the second input end of the comparison unit is used to input a preset threshold, and the output end of the comparison unit is respectively connected to the second input end of the first switch tube and the second input end of the second switch tube;

[0099] When the power supply voltage input to the comparison unit from the power supply input terminal is greater than a preset threshold value, the first switch tube is turned on, the second switch tube is turned off, the power supply voltage is output to the power supply output terminal through the first switch tube, and the power supply voltage is boosted by the boost unit to obtain a boosted voltage, and the boosted voltage is input to the energy storage unit for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power supply voltage; or

[0100] When the power supply voltage input to the comparison unit at the power supply input end is less than or equal to a preset threshold, the first switch tube is turned off, the second switch tube is turned on, the energy storage unit outputs a backup voltage to the DC conversion unit, the backup voltage is stepped down by the DC conversion unit to obtain a conversion voltage, and the conversion voltage is output to the power supply output end through the second switch tube, wherein the conversion voltage is equal to the power supply voltage.

[0101] In a specific embodiment of the present application, the energy storage unit includes a Zener diode and an energy storage capacitor, the cathode of the Zener diode is respectively connected to the output end of the boost unit and the input end of the DC conversion unit, the anode of the Zener diode is grounded, and the Zener diode is connected in parallel with the energy storage capacitor.

[0102] In a specific embodiment of the present application, the first switch tube includes an inverter and a first MOS tube, the input end of the inverter is connected to the comparison unit, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end, and the output end of the first MOS tube is connected to the power output end, the second switch tube includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit, the input end of the second MOS tube is connected to the output end of the DC conversion unit, and the output end of the second MOS tube is connected to the power output end,

[0103] When the power supply voltage input to the comparison unit from the power supply input terminal is greater than a preset threshold value, the comparison unit outputs a first level signal, and the comparison unit outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal obtains a second level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals;

[0104] When the power supply voltage input from the power supply input terminal to the comparison unit is less than or equal to the preset threshold value, the comparison unit outputs a second level signal, and the comparison unit outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable terminal of the first MOS tube, so that the first MOS tube is turned off, and the second level signal is input to the enable terminal of the second MOS tube, so that the second MOS tube is turned on.

[0105] In a specific embodiment of the present application, the comparison unit is also used to send a second level signal to report power-off information to the optical module and the electronic device when the power voltage input to the comparison unit at the power input end is less than or equal to a preset threshold.

[0106] In a specific embodiment of the present application, the boost unit is an APD boost circuit.

[0107] For the sake of simplicity, only the composition and connection relationship of the power-off alarm circuit of the optical module in the electronic device are described above, wherein the electronic device can be an ONU device or other optical communication device, which is not specifically limited here. Figures 3 to 6 And the related description will not be repeated here.

[0108] When an optical module is provided in the above electronic device, and the high voltage output by the APD boost circuit is used in the optical module to charge the energy storage capacitor, when the power supply voltage of the optical module is powered off, the energy storage capacitor can be used to power the optical module. In the above electronic device, since the high voltage output by the APD boost circuit inside the optical module is used to charge the energy storage capacitor, the capacity of the energy storage capacitor can be reduced without the need to add an additional power boost chip, thereby greatly reducing the volume of the energy storage capacitor, and the volume of the optical module is also reduced accordingly, thereby reducing the manufacturing cost.

[0109] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a storage disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state storage disk (SSD)), etc. In the embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0110] In the several embodiments provided in the present application, it should be understood that the disclosed devices can also be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the indirect coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical or other forms.

[0111] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present application.

[0112] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0113] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium may include, for example: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

[0114] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A circuit module, characterized in that: The circuit module is applied to an electronic device, the electronic device includes a power supply circuit and an optical module, the optical module is used to convert an electrical signal received by the electronic device into an optical signal or convert an optical signal into an electrical signal, the power supply circuit is used to power the optical module, the optical module includes the circuit module, and the circuit module includes: The power input end is connected to the first input end of the first switch tube, and the output end of the first switch tube is connected to the power output end; The power input end is connected to the input end of the boost unit, the output end of the boost unit is connected to the input end of the energy storage unit, the output end of the energy storage unit is connected to the input end of the DC conversion unit, the output end of the DC conversion unit is connected to the first input end of the second switch tube, the output end of the second switch tube is connected to the power output end, and the boost unit includes an avalanche photodiode APD boost circuit; The power input terminal is connected to the first input terminal of the comparison unit, the second input terminal of the comparison unit is used to input a preset threshold, and the output terminal of the comparison unit is respectively connected to the second input terminal of the first switch tube and the second input terminal of the second switch tube; When the power supply voltage input from the power supply input terminal to the comparison unit is greater than the preset threshold value, the first switch tube is turned on, the second switch tube is turned off, the power supply voltage is output to the power supply output terminal through the first switch tube, and the power supply voltage is boosted by the boost unit to obtain a boosted voltage, and the boosted voltage is input to the energy storage unit for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power supply voltage; or When the power supply voltage input to the comparison unit from the power supply input terminal is less than or equal to the preset threshold value, the first switch tube is turned off, the second switch tube is turned on, the energy storage unit outputs the backup voltage to the DC conversion unit, the backup voltage is stepped down by the DC conversion unit to obtain a conversion voltage, and the conversion voltage is output to the power supply output terminal through the second switch tube, wherein the conversion voltage is equal to the power supply voltage.

2. The circuit module according to claim 1, characterized in that: The energy storage unit includes a voltage regulator diode and an energy storage capacitor, the cathode of the voltage regulator diode is respectively connected to the output end of the boost unit and the input end of the DC conversion unit, the anode of the voltage regulator diode is grounded, and the voltage regulator diode is connected in parallel with the energy storage capacitor.

3. The circuit module according to claim 1 or 2, characterized in that: The first switch tube includes an inverter and a first metal oxide semiconductor (MOS) tube, the input end of the inverter is connected to the comparison unit, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end, and the output end of the first MOS tube is connected to the power output end, the second switch tube includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit, the input end of the second MOS tube is connected to the output end of the DC conversion unit, and the output end of the second MOS tube is connected to the power output end, When the power supply voltage input from the power supply input end to the comparison unit is greater than the preset threshold, the first switch tube is turned on and the second switch tube is turned off, comprising: when the power supply voltage input from the power supply input end to the comparison unit is greater than the preset threshold, the comparison unit outputs a first level signal, the comparison unit outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal obtains a second level signal through the inverter, the second level signal is input to the enable end of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable end of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals; When the power supply voltage input to the comparison unit at the power supply input end is less than or equal to the preset threshold value, the first switch tube is turned off and the second switch tube is turned on, including: when the power supply voltage input to the comparison unit at the power supply input end is less than or equal to the preset threshold value, the comparison unit outputs the second level signal, the comparison unit outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable end of the first MOS tube, so that the first MOS tube is turned off, and the second level signal is input to the enable end of the second MOS tube, so that the second MOS tube is turned on.

4. The circuit module according to claim 3, characterized in that: The comparison unit is further configured to send the second level signal when the power supply voltage input to the comparison unit from the power supply input terminal is less than or equal to the preset threshold.

5. An electronic device, characterized in that: The electronic device includes an external power supply circuit and an optical module, wherein the optical module is used to convert an electrical signal received by the electronic device into an optical signal or convert an optical signal into an electrical signal, the power supply circuit is used to power the optical module, and the optical module includes a power input terminal, a power output terminal, a first switch tube, a second switch tube, a comparison unit, a boost unit, an energy storage unit, and a DC conversion unit. The power input end is connected to the first input end of the first switch tube, and the output end of the first switch tube is connected to the power output end; The power input end is connected to the input end of the boost unit, the output end of the boost unit is connected to the input end of the energy storage unit, the output end of the energy storage unit is connected to the input end of the DC conversion unit, the output end of the DC conversion unit is connected to the first input end of the second switch tube, the output end of the second switch tube is connected to the power output end, and the boost unit includes an avalanche photodiode APD boost circuit; The power input end is connected to the first input end of the comparison unit, the second input end of the comparison unit is used to input a preset threshold, and the output end of the comparison unit is respectively connected to the second input end of the first switch tube and the second input end of the second switch tube; When the power supply voltage input from the power supply input terminal to the comparison unit is greater than the preset threshold value, the first switch tube is turned on, the second switch tube is turned off, the power supply voltage is output to the power supply output terminal through the first switch tube, and the power supply voltage is boosted by the boost unit to obtain a boosted voltage, and the boosted voltage is input to the energy storage unit for charging to obtain a standby voltage, wherein the boosted voltage is greater than the power supply voltage; or When the power supply voltage input to the comparison unit from the power supply input terminal is less than or equal to the preset threshold value, the first switch tube is turned off, the second switch tube is turned on, the energy storage unit outputs the backup voltage to the DC conversion unit, the backup voltage is stepped down by the DC conversion unit to obtain a conversion voltage, and the conversion voltage is output to the power supply output terminal through the second switch tube, wherein the conversion voltage is equal to the power supply voltage.

6. The electronic device according to claim 5, characterized in that: The energy storage unit includes a voltage regulator diode and an energy storage capacitor, the cathode of the voltage regulator diode is respectively connected to the output end of the boost unit and the input end of the DC conversion unit, the anode of the voltage regulator diode is grounded, and the voltage regulator diode is connected in parallel with the energy storage capacitor.

7. The electronic device according to claim 5 or 6, characterized in that: The first switch tube includes an inverter and a first metal oxide semiconductor (MOS) tube, the input end of the inverter is connected to the comparison unit, the output end of the inverter is connected to the enable end of the first MOS tube, the input end of the first MOS tube is connected to the power input end, and the output end of the first MOS tube is connected to the power output end, the second switch tube includes a second MOS tube, the enable end of the second MOS tube is connected to the output end of the comparison unit, the input end of the second MOS tube is connected to the output end of the DC conversion unit, and the output end of the second MOS tube is connected to the power output end, When the power supply voltage input from the power supply input end to the comparison unit is greater than the preset threshold, the first switch tube is turned on and the second switch tube is turned off, comprising: when the power supply voltage input from the power supply input end to the comparison unit is greater than the preset threshold, the comparison unit outputs a first level signal, the comparison unit outputs the first level signal to the inverter and the second MOS tube respectively, the first level signal obtains a second level signal through the inverter, the second level signal is input to the enable end of the first MOS tube, so that the first MOS tube is turned on, and the first level signal is input to the enable end of the second MOS tube, so that the second MOS tube is turned off, wherein the first level signal and the second level signal are mutually inverted level signals; When the power supply voltage input to the comparison unit at the power supply input end is less than or equal to the preset threshold value, the first switch tube is turned off and the second switch tube is turned on, including: when the power supply voltage input to the comparison unit at the power supply input end is less than or equal to the preset threshold value, the comparison unit outputs the second level signal, the comparison unit outputs the second level signal to the inverter and the second MOS tube respectively, the second level signal obtains the first level signal through the inverter, the second level signal is input to the enable end of the first MOS tube, so that the first MOS tube is turned off, and the second level signal is input to the enable end of the second MOS tube, so that the second MOS tube is turned on.

8. The electronic device according to claim 7, characterized in that: The comparison unit is further configured to send the second level signal when the power supply voltage input to the comparison unit from the power supply input terminal is less than or equal to the preset threshold.

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